[GFS2] Pre-pull patch posting

[GFS2] Pre-pull patch posting

[swhiteho]

Hi,

Here is the current GFS2 patch queue. You'll notice that this time
there are no DLM patches in this list. That is because the DLM team
are setting up their own git tree and this future DLM patches will
be sent directly by them rather than via the GFS2 tree.

Most of this set of patches is clean up and bug fixes, there is really
not a lot new this time. I guess the most significant thing is the
patch to use ->page_mkwrite which will greatly increase efficiency
when files opened r/w are mostly only accessed for reading across a
cluster.

There are a number of cleanups related to journalling which is really
where the largest number of changes in terms of code lines is. The
indirect blocks for the journal are now scanned once only at mount
time and the bmap information is retained in the form of an extent
list. Since we expect journals to consist of only a single extent
in the normal case, this should generally be quite a short list :-)

In addition some of the tunables relating to the journal have been
removed in favour of autotuning those variables.

Steve.

[PATCH 01/58] [GFS2] Handle multiple glock demote requests

[swhiteho]

From: Wendy Cheng <wcheng@redhat.com>

Fix a race condition where multiple glock demote requests are sent to
a node back-to-back. This patch does a check inside handle_callback()
to see whether a demote request is in progress. If true, it sets a flag
to make sure run_queue() will loop again to handle the new request,
instead of erronously setting gl_demote_state to a different state.

Signed-off-by: S. Wendy Cheng <wcheng@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index a37efe4..104e83f 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -567,7 +567,10 @@ static int rq_demote(struct gfs2_glock *gl)
 		gfs2_demote_wake(gl);
 		return 0;
 	}
+
 	set_bit(GLF_LOCK, &gl->gl_flags);
+	set_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags);
+
 	if (gl->gl_demote_state == LM_ST_UNLOCKED ||
 	    gl->gl_state != LM_ST_EXCLUSIVE) {
 		spin_unlock(&gl->gl_spin);
@@ -576,7 +579,9 @@ static int rq_demote(struct gfs2_glock *gl)
 		spin_unlock(&gl->gl_spin);
 		gfs2_glock_xmote_th(gl, NULL);
 	}
+
 	spin_lock(&gl->gl_spin);
+	clear_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags);
 
 	return 0;
 }
@@ -606,6 +611,11 @@ static void run_queue(struct gfs2_glock *gl)
 
 		} else if (test_bit(GLF_DEMOTE, &gl->gl_flags)) {
 			blocked = rq_demote(gl);
+			if (gl->gl_waiters2 && !blocked) {
+				set_bit(GLF_DEMOTE, &gl->gl_flags);
+				gl->gl_demote_state = LM_ST_UNLOCKED;
+			}
+			gl->gl_waiters2 = 0;
 		} else if (!list_empty(&gl->gl_waiters3)) {
 			gh = list_entry(gl->gl_waiters3.next,
 					struct gfs2_holder, gh_list);
@@ -722,7 +732,10 @@ static void handle_callback(struct gfs2_glock *gl, unsigned int state,
 		}
 	} else if (gl->gl_demote_state != LM_ST_UNLOCKED &&
 			gl->gl_demote_state != state) {
-		gl->gl_demote_state = LM_ST_UNLOCKED;
+		if (test_bit(GLF_DEMOTE_IN_PROGRESS,  &gl->gl_flags)) 
+			gl->gl_waiters2 = 1;
+		else 
+			gl->gl_demote_state = LM_ST_UNLOCKED;
 	}
 	spin_unlock(&gl->gl_spin);
 }
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index eaddfb5..662182b 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -171,6 +171,7 @@ enum {
 	GLF_DEMOTE		= 3,
 	GLF_PENDING_DEMOTE	= 4,
 	GLF_DIRTY		= 5,
+	GLF_DEMOTE_IN_PROGRESS	= 6,
 };
 
 struct gfs2_glock {
@@ -190,6 +191,7 @@ struct gfs2_glock {
 	struct list_head gl_holders;
 	struct list_head gl_waiters1;	/* HIF_MUTEX */
 	struct list_head gl_waiters3;	/* HIF_PROMOTE */
+	int gl_waiters2;		/* GIF_DEMOTE */
 
 	const struct gfs2_glock_operations *gl_ops;
 
-- 
1.5.1.2

[PATCH 02/58] [GFS2] Clean up internal read function

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

As requested by Christoph, this patch cleans up GFS2's internal
read function so that it no longer uses the do_generic_mapping_read
function. This function is obsolete and GFS2 is the last user of it.

As a side effect the internal read code gets smaller and easier
to read and gfs2_readpage is split into two. One function has the locking
and the other function has the rest of the logic.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 5f6dc32..ad0fe37 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -31,7 +31,6 @@
 #include "log.h"
 #include "meta_io.h"
 #include "ops_address.h"
-#include "ops_file.h"
 #include "ops_inode.h"
 #include "quota.h"
 #include "rgrp.h"
diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index 9679f8b..9bb24b1 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -20,6 +20,7 @@
 #include <linux/swap.h>
 #include <linux/gfs2_ondisk.h>
 #include <linux/lm_interface.h>
+#include <linux/swap.h>
 
 #include "gfs2.h"
 #include "incore.h"
@@ -32,7 +33,6 @@
 #include "quota.h"
 #include "trans.h"
 #include "rgrp.h"
-#include "ops_file.h"
 #include "super.h"
 #include "util.h"
 #include "glops.h"
@@ -231,62 +231,115 @@ static int stuffed_readpage(struct gfs2_inode *ip, struct page *page)
 
 
 /**
- * gfs2_readpage - readpage with locking
- * @file: The file to read a page for. N.B. This may be NULL if we are
- * reading an internal file.
+ * __gfs2_readpage - readpage
+ * @file: The file to read a page for
  * @page: The page to read
  *
- * Returns: errno
+ * This is the core of gfs2's readpage. Its used by the internal file
+ * reading code as in that case we already hold the glock. Also its
+ * called by gfs2_readpage() once the required lock has been granted.
+ *
  */
 
-static int gfs2_readpage(struct file *file, struct page *page)
+static int __gfs2_readpage(void *file, struct page *page)
 {
 	struct gfs2_inode *ip = GFS2_I(page->mapping->host);
 	struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
-	struct gfs2_file *gf = NULL;
-	struct gfs2_holder gh;
 	int error;
-	int do_unlock = 0;
-
-	if (likely(file != &gfs2_internal_file_sentinel)) {
-		if (file) {
-			gf = file->private_data;
-			if (test_bit(GFF_EXLOCK, &gf->f_flags))
-				/* gfs2_sharewrite_fault has grabbed the ip->i_gl already */
-				goto skip_lock;
-		}
-		gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME|LM_FLAG_TRY_1CB, &gh);
-		do_unlock = 1;
-		error = gfs2_glock_nq_atime(&gh);
-		if (unlikely(error))
-			goto out_unlock;
-	}
 
-skip_lock:
 	if (gfs2_is_stuffed(ip)) {
 		error = stuffed_readpage(ip, page);
 		unlock_page(page);
-	} else
+	} else {
 		error = mpage_readpage(page, gfs2_get_block);
+	}
 
 	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
-		error = -EIO;
+		return -EIO;
 
-	if (do_unlock) {
-		gfs2_glock_dq_m(1, &gh);
-		gfs2_holder_uninit(&gh);
+	return error;
+}
+
+/**
+ * gfs2_readpage - read a page of a file
+ * @file: The file to read
+ * @page: The page of the file
+ *
+ * This deals with the locking required. If the GFF_EXLOCK flags is set
+ * then we already hold the glock (due to page fault) and thus we call
+ * __gfs2_readpage() directly. Otherwise we use a trylock in order to
+ * avoid the page lock / glock ordering problems returning AOP_TRUNCATED_PAGE
+ * in the event that we are unable to get the lock.
+ */
+
+static int gfs2_readpage(struct file *file, struct page *page)
+{
+	struct gfs2_inode *ip = GFS2_I(page->mapping->host);
+	struct gfs2_holder gh;
+	int error;
+
+	if (file) {
+		struct gfs2_file *gf = file->private_data;
+		if (test_bit(GFF_EXLOCK, &gf->f_flags))
+			return __gfs2_readpage(file, page);
 	}
+
+	gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME|LM_FLAG_TRY_1CB, &gh);
+	error = gfs2_glock_nq_atime(&gh);
+	if (unlikely(error)) {
+		unlock_page(page);
+		goto out;
+	}
+	error = __gfs2_readpage(file, page);
+	gfs2_glock_dq(&gh);
 out:
-	return error;
-out_unlock:
-	unlock_page(page);
+	gfs2_holder_uninit(&gh);
 	if (error == GLR_TRYFAILED) {
-		error = AOP_TRUNCATED_PAGE;
 		yield();
+		return AOP_TRUNCATED_PAGE;
 	}
-	if (do_unlock)
-		gfs2_holder_uninit(&gh);
-	goto out;
+	return error;
+}
+
+/**
+ * gfs2_internal_read - read an internal file
+ * @ip: The gfs2 inode
+ * @ra_state: The readahead state (or NULL for no readahead)
+ * @buf: The buffer to fill
+ * @pos: The file position
+ * @size: The amount to read
+ *
+ */
+
+int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state,
+                       char *buf, loff_t *pos, unsigned size)
+{
+	struct address_space *mapping = ip->i_inode.i_mapping;
+	unsigned long index = *pos / PAGE_CACHE_SIZE;
+	unsigned offset = *pos & (PAGE_CACHE_SIZE - 1);
+	unsigned copied = 0;
+	unsigned amt;
+	struct page *page;
+	void *p;
+
+	do {
+		amt = size - copied;
+		if (offset + size > PAGE_CACHE_SIZE)
+			amt = PAGE_CACHE_SIZE - offset;
+		page = read_cache_page(mapping, index, __gfs2_readpage, NULL);
+		if (IS_ERR(page))
+			return PTR_ERR(page);
+		p = kmap_atomic(page, KM_USER0);
+		memcpy(buf + copied, p + offset, amt);
+		kunmap_atomic(p, KM_USER0);
+		mark_page_accessed(page);
+		page_cache_release(page);
+		copied += amt;
+		index++;
+		offset = 0;
+	} while(copied < size);
+	(*pos) += size;
+	return size;
 }
 
 /**
@@ -314,21 +367,19 @@ static int gfs2_readpages(struct file *file, struct address_space *mapping,
 	int ret = 0;
 	int do_unlock = 0;
 
-	if (likely(file != &gfs2_internal_file_sentinel)) {
-		if (file) {
-			struct gfs2_file *gf = file->private_data;
-			if (test_bit(GFF_EXLOCK, &gf->f_flags))
-				goto skip_lock;
-		}
-		gfs2_holder_init(ip->i_gl, LM_ST_SHARED,
-				 LM_FLAG_TRY_1CB|GL_ATIME, &gh);
-		do_unlock = 1;
-		ret = gfs2_glock_nq_atime(&gh);
-		if (ret == GLR_TRYFAILED)
-			goto out_noerror;
-		if (unlikely(ret))
-			goto out_unlock;
+	if (file) {
+		struct gfs2_file *gf = file->private_data;
+		if (test_bit(GFF_EXLOCK, &gf->f_flags))
+			goto skip_lock;
 	}
+	gfs2_holder_init(ip->i_gl, LM_ST_SHARED,
+			 LM_FLAG_TRY_1CB|GL_ATIME, &gh);
+	do_unlock = 1;
+	ret = gfs2_glock_nq_atime(&gh);
+	if (ret == GLR_TRYFAILED)
+		goto out_noerror;
+	if (unlikely(ret))
+		goto out_unlock;
 skip_lock:
 	if (!gfs2_is_stuffed(ip))
 		ret = mpage_readpages(mapping, pages, nr_pages, gfs2_get_block);
diff --git a/fs/gfs2/ops_address.h b/fs/gfs2/ops_address.h
index fa1b5b3..e8fe83f 100644
--- a/fs/gfs2/ops_address.h
+++ b/fs/gfs2/ops_address.h
@@ -18,5 +18,8 @@ extern const struct address_space_operations gfs2_file_aops;
 extern int gfs2_get_block(struct inode *inode, sector_t lblock,
 			  struct buffer_head *bh_result, int create);
 extern int gfs2_releasepage(struct page *page, gfp_t gfp_mask);
+extern int gfs2_internal_read(struct gfs2_inode *ip,
+			      struct file_ra_state *ra_state,
+			      char *buf, loff_t *pos, unsigned size);
 
 #endif /* __OPS_ADDRESS_DOT_H__ */
diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c
index bb11fd6..a729c86 100644
--- a/fs/gfs2/ops_file.c
+++ b/fs/gfs2/ops_file.c
@@ -33,7 +33,6 @@
 #include "lm.h"
 #include "log.h"
 #include "meta_io.h"
-#include "ops_file.h"
 #include "ops_vm.h"
 #include "quota.h"
 #include "rgrp.h"
@@ -41,50 +40,6 @@
 #include "util.h"
 #include "eaops.h"
 
-/*
- * Most fields left uninitialised to catch anybody who tries to
- * use them. f_flags set to prevent file_accessed() from touching
- * any other part of this. Its use is purely as a flag so that we
- * know (in readpage()) whether or not do to locking.
- */
-struct file gfs2_internal_file_sentinel = {
-	.f_flags = O_NOATIME|O_RDONLY,
-};
-
-static int gfs2_read_actor(read_descriptor_t *desc, struct page *page,
-			   unsigned long offset, unsigned long size)
-{
-	char *kaddr;
-	unsigned long count = desc->count;
-
-	if (size > count)
-		size = count;
-
-	kaddr = kmap(page);
-	memcpy(desc->arg.data, kaddr + offset, size);
-	kunmap(page);
-
-	desc->count = count - size;
-	desc->written += size;
-	desc->arg.buf += size;
-	return size;
-}
-
-int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state,
-		       char *buf, loff_t *pos, unsigned size)
-{
-	struct inode *inode = &ip->i_inode;
-	read_descriptor_t desc;
-	desc.written = 0;
-	desc.arg.data = buf;
-	desc.count = size;
-	desc.error = 0;
-	do_generic_mapping_read(inode->i_mapping, ra_state,
-				&gfs2_internal_file_sentinel, pos, &desc,
-				gfs2_read_actor);
-	return desc.written ? desc.written : desc.error;
-}
-
 /**
  * gfs2_llseek - seek to a location in a file
  * @file: the file
diff --git a/fs/gfs2/ops_file.h b/fs/gfs2/ops_file.h
deleted file mode 100644
index 7e5d8ec..0000000
--- a/fs/gfs2/ops_file.h
+++ /dev/null
@@ -1,24 +0,0 @@
-/*
- * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
- * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
- *
- * This copyrighted material is made available to anyone wishing to use,
- * modify, copy, or redistribute it subject to the terms and conditions
- * of the GNU General Public License version 2.
- */
-
-#ifndef __OPS_FILE_DOT_H__
-#define __OPS_FILE_DOT_H__
-
-#include <linux/fs.h>
-struct gfs2_inode;
-
-extern struct file gfs2_internal_file_sentinel;
-extern int gfs2_internal_read(struct gfs2_inode *ip,
-			      struct file_ra_state *ra_state,
-			      char *buf, loff_t *pos, unsigned size);
-extern void gfs2_set_inode_flags(struct inode *inode);
-extern const struct file_operations gfs2_file_fops;
-extern const struct file_operations gfs2_dir_fops;
-
-#endif /* __OPS_FILE_DOT_H__ */
diff --git a/fs/gfs2/ops_inode.h b/fs/gfs2/ops_inode.h
index 34f0caa..edb519c 100644
--- a/fs/gfs2/ops_inode.h
+++ b/fs/gfs2/ops_inode.h
@@ -16,5 +16,9 @@ extern const struct inode_operations gfs2_file_iops;
 extern const struct inode_operations gfs2_dir_iops;
 extern const struct inode_operations gfs2_symlink_iops;
 extern const struct inode_operations gfs2_dev_iops;
+extern const struct file_operations gfs2_file_fops;
+extern const struct file_operations gfs2_dir_fops;
+
+extern void gfs2_set_inode_flags(struct inode *inode);
 
 #endif /* __OPS_INODE_DOT_H__ */
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index addb51e..4996f0e 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -59,7 +59,6 @@
 #include "super.h"
 #include "trans.h"
 #include "inode.h"
-#include "ops_file.h"
 #include "ops_address.h"
 #include "util.h"
 
@@ -793,11 +792,9 @@ static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
 	struct gfs2_holder i_gh;
 	struct gfs2_quota_host q;
 	char buf[sizeof(struct gfs2_quota)];
-	struct file_ra_state ra_state;
 	int error;
 	struct gfs2_quota_lvb *qlvb;
 
-	file_ra_state_init(&ra_state, sdp->sd_quota_inode->i_mapping);
 restart:
 	error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
 	if (error)
@@ -820,8 +817,8 @@ restart:
 
 		memset(buf, 0, sizeof(struct gfs2_quota));
 		pos = qd2offset(qd);
-		error = gfs2_internal_read(ip, &ra_state, buf,
-					   &pos, sizeof(struct gfs2_quota));
+		error = gfs2_internal_read(ip, NULL, buf, &pos,
+					   sizeof(struct gfs2_quota));
 		if (error < 0)
 			goto fail_gunlock;
 
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 708c287..09848aa 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -25,10 +25,10 @@
 #include "rgrp.h"
 #include "super.h"
 #include "trans.h"
-#include "ops_file.h"
 #include "util.h"
 #include "log.h"
 #include "inode.h"
+#include "ops_address.h"
 
 #define BFITNOENT ((u32)~0)
 #define NO_BLOCK ((u64)~0)
-- 
1.5.1.2

[PATCH 03/58] [GFS2] Use ->page_mkwrite() for mmap()

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

This cleans up the mmap() code path for GFS2 by implementing the
page_mkwrite function for GFS2. We are thus able to use the
generic filemap_fault function for our ->fault() implementation.

This now means that shared writable mappings will be much more
efficiently shared across the cluster if there is a reasonable
proportion of read activity (the greater proportion, the better).

As a side effect, it also reduces the size of the code, removes
special cases from readpage and readpages, and makes the code
path easier to follow.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/Makefile b/fs/gfs2/Makefile
index 04ad0ca..8fff110 100644
--- a/fs/gfs2/Makefile
+++ b/fs/gfs2/Makefile
@@ -2,7 +2,7 @@ obj-$(CONFIG_GFS2_FS) += gfs2.o
 gfs2-y := acl.o bmap.o daemon.o dir.o eaops.o eattr.o glock.o \
 	glops.o inode.o lm.o log.o lops.o locking.o main.o meta_io.o \
 	mount.o ops_address.o ops_dentry.o ops_export.o ops_file.o \
-	ops_fstype.o ops_inode.o ops_super.o ops_vm.o quota.o \
+	ops_fstype.o ops_inode.o ops_super.o quota.o \
 	recovery.o rgrp.o super.o sys.o trans.o util.o
 
 obj-$(CONFIG_GFS2_FS_LOCKING_NOLOCK) += locking/nolock/
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 4670dcb..110f03d 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -86,15 +86,10 @@ static void gfs2_pte_inval(struct gfs2_glock *gl)
 	if (!ip || !S_ISREG(inode->i_mode))
 		return;
 
-	if (!test_bit(GIF_PAGED, &ip->i_flags))
-		return;
-
 	unmap_shared_mapping_range(inode->i_mapping, 0, 0);
-
 	if (test_bit(GIF_SW_PAGED, &ip->i_flags))
 		set_bit(GLF_DIRTY, &gl->gl_flags);
 
-	clear_bit(GIF_SW_PAGED, &ip->i_flags);
 }
 
 /**
@@ -234,10 +229,8 @@ static void inode_go_inval(struct gfs2_glock *gl, int flags)
 			set_bit(GIF_INVALID, &ip->i_flags);
 	}
 
-	if (ip && S_ISREG(ip->i_inode.i_mode)) {
+	if (ip && S_ISREG(ip->i_inode.i_mode))
 		truncate_inode_pages(ip->i_inode.i_mapping, 0);
-		clear_bit(GIF_PAGED, &ip->i_flags);
-	}
 }
 
 /**
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 662182b..55c72f0 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -241,7 +241,6 @@ struct gfs2_alloc {
 enum {
 	GIF_INVALID		= 0,
 	GIF_QD_LOCKED		= 1,
-	GIF_PAGED		= 2,
 	GIF_SW_PAGED		= 3,
 };
 
@@ -289,19 +288,12 @@ static inline struct gfs2_inode *GFS2_I(struct inode *inode)
 	return container_of(inode, struct gfs2_inode, i_inode);
 }
 
-/* To be removed? */
 static inline struct gfs2_sbd *GFS2_SB(struct inode *inode)
 {
 	return inode->i_sb->s_fs_info;
 }
 
-enum {
-	GFF_DID_DIRECT_ALLOC	= 0,
-	GFF_EXLOCK = 1,
-};
-
 struct gfs2_file {
-	unsigned long f_flags;		/* GFF_... */
 	struct mutex f_fl_mutex;
 	struct gfs2_holder f_fl_gh;
 };
diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index 9bb24b1..1696e5d 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -265,9 +265,7 @@ static int __gfs2_readpage(void *file, struct page *page)
  * @file: The file to read
  * @page: The page of the file
  *
- * This deals with the locking required. If the GFF_EXLOCK flags is set
- * then we already hold the glock (due to page fault) and thus we call
- * __gfs2_readpage() directly. Otherwise we use a trylock in order to
+ * This deals with the locking required. We use a trylock in order to
  * avoid the page lock / glock ordering problems returning AOP_TRUNCATED_PAGE
  * in the event that we are unable to get the lock.
  */
@@ -278,12 +276,6 @@ static int gfs2_readpage(struct file *file, struct page *page)
 	struct gfs2_holder gh;
 	int error;
 
-	if (file) {
-		struct gfs2_file *gf = file->private_data;
-		if (test_bit(GFF_EXLOCK, &gf->f_flags))
-			return __gfs2_readpage(file, page);
-	}
-
 	gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME|LM_FLAG_TRY_1CB, &gh);
 	error = gfs2_glock_nq_atime(&gh);
 	if (unlikely(error)) {
@@ -354,9 +346,8 @@ int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state,
  * 2. We don't handle stuffed files here we let readpage do the honours.
  * 3. mpage_readpages() does most of the heavy lifting in the common case.
  * 4. gfs2_get_block() is relied upon to set BH_Boundary in the right places.
- * 5. We use LM_FLAG_TRY_1CB here, effectively we then have lock-ahead as
- *    well as read-ahead.
  */
+
 static int gfs2_readpages(struct file *file, struct address_space *mapping,
 			  struct list_head *pages, unsigned nr_pages)
 {
@@ -364,40 +355,20 @@ static int gfs2_readpages(struct file *file, struct address_space *mapping,
 	struct gfs2_inode *ip = GFS2_I(inode);
 	struct gfs2_sbd *sdp = GFS2_SB(inode);
 	struct gfs2_holder gh;
-	int ret = 0;
-	int do_unlock = 0;
+	int ret;
 
-	if (file) {
-		struct gfs2_file *gf = file->private_data;
-		if (test_bit(GFF_EXLOCK, &gf->f_flags))
-			goto skip_lock;
-	}
-	gfs2_holder_init(ip->i_gl, LM_ST_SHARED,
-			 LM_FLAG_TRY_1CB|GL_ATIME, &gh);
-	do_unlock = 1;
+	gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
 	ret = gfs2_glock_nq_atime(&gh);
-	if (ret == GLR_TRYFAILED)
-		goto out_noerror;
 	if (unlikely(ret))
-		goto out_unlock;
-skip_lock:
+		goto out_uninit;
 	if (!gfs2_is_stuffed(ip))
 		ret = mpage_readpages(mapping, pages, nr_pages, gfs2_get_block);
-
-	if (do_unlock) {
-		gfs2_glock_dq_m(1, &gh);
-		gfs2_holder_uninit(&gh);
-	}
-out:
+	gfs2_glock_dq(&gh);
+out_uninit:
+	gfs2_holder_uninit(&gh);
 	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 		ret = -EIO;
 	return ret;
-out_noerror:
-	ret = 0;
-out_unlock:
-	if (do_unlock)
-		gfs2_holder_uninit(&gh);
-	goto out;
 }
 
 /**
diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c
index a729c86..6f3aeb0 100644
--- a/fs/gfs2/ops_file.c
+++ b/fs/gfs2/ops_file.c
@@ -33,7 +33,6 @@
 #include "lm.h"
 #include "log.h"
 #include "meta_io.h"
-#include "ops_vm.h"
 #include "quota.h"
 #include "rgrp.h"
 #include "trans.h"
@@ -169,7 +168,7 @@ static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
 	if (put_user(fsflags, ptr))
 		error = -EFAULT;
 
-	gfs2_glock_dq_m(1, &gh);
+	gfs2_glock_dq(&gh);
 	gfs2_holder_uninit(&gh);
 	return error;
 }
@@ -293,6 +292,125 @@ static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 	return -ENOTTY;
 }
 
+/**
+ * gfs2_allocate_page_backing - Use bmap to allocate blocks
+ * @page: The (locked) page to allocate backing for
+ *
+ * We try to allocate all the blocks required for the page in
+ * one go. This might fail for various reasons, so we keep
+ * trying until all the blocks to back this page are allocated.
+ * If some of the blocks are already allocated, thats ok too.
+ */
+
+static int gfs2_allocate_page_backing(struct page *page)
+{
+	struct inode *inode = page->mapping->host;
+	struct buffer_head bh;
+	unsigned long size = PAGE_CACHE_SIZE;
+	u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
+
+	do {
+		bh.b_state = 0;
+		bh.b_size = size;
+		gfs2_block_map(inode, lblock, 1, &bh);
+		if (!buffer_mapped(&bh))
+			return -EIO;
+		size -= bh.b_size;
+		lblock += (bh.b_size >> inode->i_blkbits);
+	} while(size > 0);
+	return 0;
+}
+
+/**
+ * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
+ * @vma: The virtual memory area
+ * @page: The page which is about to become writable
+ *
+ * When the page becomes writable, we need to ensure that we have
+ * blocks allocated on disk to back that page.
+ */
+
+static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page)
+{
+	struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
+	struct gfs2_inode *ip = GFS2_I(inode);
+	struct gfs2_sbd *sdp = GFS2_SB(inode);
+	unsigned long last_index;
+	u64 pos = page->index << (PAGE_CACHE_SIZE - inode->i_blkbits);
+	unsigned int data_blocks, ind_blocks, rblocks;
+	int alloc_required = 0;
+	struct gfs2_holder gh;
+	struct gfs2_alloc *al;
+	int ret;
+
+	gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME, &gh);
+	ret = gfs2_glock_nq_atime(&gh);
+	if (ret)
+		goto out;
+
+	set_bit(GIF_SW_PAGED, &ip->i_flags);
+	gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
+	ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required);
+	if (ret || !alloc_required)
+		goto out_unlock;
+
+	ip->i_alloc.al_requested = 0;
+	al = gfs2_alloc_get(ip);
+	ret = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+	if (ret)
+		goto out_alloc_put;
+	ret = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid);
+	if (ret)
+		goto out_quota_unlock;
+	al->al_requested = data_blocks + ind_blocks;
+	ret = gfs2_inplace_reserve(ip);
+	if (ret)
+		goto out_quota_unlock;
+
+	rblocks = RES_DINODE + ind_blocks;
+	if (gfs2_is_jdata(ip))
+		rblocks += data_blocks ? data_blocks : 1;
+	if (ind_blocks || data_blocks)
+		rblocks += RES_STATFS + RES_QUOTA;
+	ret = gfs2_trans_begin(sdp, rblocks, 0);
+	if (ret)
+		goto out_trans_fail;
+
+	lock_page(page);
+	ret = -EINVAL;
+	last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT;
+	if (page->index > last_index)
+		goto out_unlock_page;
+	if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping)
+		goto out_unlock_page;
+	if (gfs2_is_stuffed(ip)) {
+		ret = gfs2_unstuff_dinode(ip, page);
+		if (ret)
+			goto out_unlock_page;
+	}
+	ret = gfs2_allocate_page_backing(page);
+
+out_unlock_page:
+	unlock_page(page);
+	gfs2_trans_end(sdp);
+out_trans_fail:
+	gfs2_inplace_release(ip);
+out_quota_unlock:
+	gfs2_quota_unlock(ip);
+out_alloc_put:
+	gfs2_alloc_put(ip);
+out_unlock:
+	gfs2_glock_dq(&gh);
+out:
+	gfs2_holder_uninit(&gh);
+	return ret;
+}
+
+static struct vm_operations_struct gfs2_vm_ops = {
+	.fault = filemap_fault,
+	.page_mkwrite = gfs2_page_mkwrite,
+};
+
 
 /**
  * gfs2_mmap -
@@ -315,14 +433,7 @@ static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
 		return error;
 	}
 
-	/* This is VM_MAYWRITE instead of VM_WRITE because a call
-	   to mprotect() can turn on VM_WRITE later. */
-
-	if ((vma->vm_flags & (VM_MAYSHARE | VM_MAYWRITE)) ==
-	    (VM_MAYSHARE | VM_MAYWRITE))
-		vma->vm_ops = &gfs2_vm_ops_sharewrite;
-	else
-		vma->vm_ops = &gfs2_vm_ops_private;
+	vma->vm_ops = &gfs2_vm_ops;
 
 	gfs2_glock_dq_uninit(&i_gh);
 
diff --git a/fs/gfs2/ops_vm.c b/fs/gfs2/ops_vm.c
deleted file mode 100644
index 927d739..0000000
--- a/fs/gfs2/ops_vm.c
+++ /dev/null
@@ -1,169 +0,0 @@
-/*
- * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
- * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
- *
- * This copyrighted material is made available to anyone wishing to use,
- * modify, copy, or redistribute it subject to the terms and conditions
- * of the GNU General Public License version 2.
- */
-
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/completion.h>
-#include <linux/buffer_head.h>
-#include <linux/mm.h>
-#include <linux/pagemap.h>
-#include <linux/gfs2_ondisk.h>
-#include <linux/lm_interface.h>
-
-#include "gfs2.h"
-#include "incore.h"
-#include "bmap.h"
-#include "glock.h"
-#include "inode.h"
-#include "ops_vm.h"
-#include "quota.h"
-#include "rgrp.h"
-#include "trans.h"
-#include "util.h"
-
-static int gfs2_private_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
-{
-	struct gfs2_inode *ip = GFS2_I(vma->vm_file->f_mapping->host);
-
-	set_bit(GIF_PAGED, &ip->i_flags);
-	return filemap_fault(vma, vmf);
-}
-
-static int alloc_page_backing(struct gfs2_inode *ip, struct page *page)
-{
-	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
-	unsigned long index = page->index;
-	u64 lblock = index << (PAGE_CACHE_SHIFT -
-				    sdp->sd_sb.sb_bsize_shift);
-	unsigned int blocks = PAGE_CACHE_SIZE >> sdp->sd_sb.sb_bsize_shift;
-	struct gfs2_alloc *al;
-	unsigned int data_blocks, ind_blocks;
-	unsigned int x;
-	int error;
-
-	al = gfs2_alloc_get(ip);
-
-	error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
-	if (error)
-		goto out;
-
-	error = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid);
-	if (error)
-		goto out_gunlock_q;
-
-	gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
-
-	al->al_requested = data_blocks + ind_blocks;
-
-	error = gfs2_inplace_reserve(ip);
-	if (error)
-		goto out_gunlock_q;
-
-	error = gfs2_trans_begin(sdp, al->al_rgd->rd_length +
-				 ind_blocks + RES_DINODE +
-				 RES_STATFS + RES_QUOTA, 0);
-	if (error)
-		goto out_ipres;
-
-	if (gfs2_is_stuffed(ip)) {
-		error = gfs2_unstuff_dinode(ip, NULL);
-		if (error)
-			goto out_trans;
-	}
-
-	for (x = 0; x < blocks; ) {
-		u64 dblock;
-		unsigned int extlen;
-		int new = 1;
-
-		error = gfs2_extent_map(&ip->i_inode, lblock, &new, &dblock, &extlen);
-		if (error)
-			goto out_trans;
-
-		lblock += extlen;
-		x += extlen;
-	}
-
-	gfs2_assert_warn(sdp, al->al_alloced);
-
-out_trans:
-	gfs2_trans_end(sdp);
-out_ipres:
-	gfs2_inplace_release(ip);
-out_gunlock_q:
-	gfs2_quota_unlock(ip);
-out:
-	gfs2_alloc_put(ip);
-	return error;
-}
-
-static int gfs2_sharewrite_fault(struct vm_area_struct *vma,
-						struct vm_fault *vmf)
-{
-	struct file *file = vma->vm_file;
-	struct gfs2_file *gf = file->private_data;
-	struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
-	struct gfs2_holder i_gh;
-	int alloc_required;
-	int error;
-	int ret = 0;
-
-	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
-	if (error)
-		goto out;
-
-	set_bit(GIF_PAGED, &ip->i_flags);
-	set_bit(GIF_SW_PAGED, &ip->i_flags);
-
-	error = gfs2_write_alloc_required(ip,
-					(u64)vmf->pgoff << PAGE_CACHE_SHIFT,
-					PAGE_CACHE_SIZE, &alloc_required);
-	if (error) {
-		ret = VM_FAULT_OOM; /* XXX: are these right? */
-		goto out_unlock;
-	}
-
-	set_bit(GFF_EXLOCK, &gf->f_flags);
-	ret = filemap_fault(vma, vmf);
-	clear_bit(GFF_EXLOCK, &gf->f_flags);
-	if (ret & VM_FAULT_ERROR)
-		goto out_unlock;
-
-	if (alloc_required) {
-		/* XXX: do we need to drop page lock around alloc_page_backing?*/
-		error = alloc_page_backing(ip, vmf->page);
-		if (error) {
-			/*
-			 * VM_FAULT_LOCKED should always be the case for
-			 * filemap_fault, but it may not be in a future
-			 * implementation.
-			 */
-			if (ret & VM_FAULT_LOCKED)
-				unlock_page(vmf->page);
-			page_cache_release(vmf->page);
-			ret = VM_FAULT_OOM;
-			goto out_unlock;
-		}
-		set_page_dirty(vmf->page);
-	}
-
-out_unlock:
-	gfs2_glock_dq_uninit(&i_gh);
-out:
-	return ret;
-}
-
-struct vm_operations_struct gfs2_vm_ops_private = {
-	.fault = gfs2_private_fault,
-};
-
-struct vm_operations_struct gfs2_vm_ops_sharewrite = {
-	.fault = gfs2_sharewrite_fault,
-};
-
diff --git a/fs/gfs2/ops_vm.h b/fs/gfs2/ops_vm.h
deleted file mode 100644
index 4ae8f43..0000000
--- a/fs/gfs2/ops_vm.h
+++ /dev/null
@@ -1,18 +0,0 @@
-/*
- * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
- * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
- *
- * This copyrighted material is made available to anyone wishing to use,
- * modify, copy, or redistribute it subject to the terms and conditions
- * of the GNU General Public License version 2.
- */
-
-#ifndef __OPS_VM_DOT_H__
-#define __OPS_VM_DOT_H__
-
-#include <linux/mm.h>
-
-extern struct vm_operations_struct gfs2_vm_ops_private;
-extern struct vm_operations_struct gfs2_vm_ops_sharewrite;
-
-#endif /* __OPS_VM_DOT_H__ */
-- 
1.5.1.2

[PATCH 04/58] [GFS2] Remove useless i_cache from inodes

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

The i_cache was designed to keep references to the indirect blocks
used during block mapping so that they didn't have to be looked
up continually. The idea failed because there are too many places
where the i_cache needs to be freed, and this has in the past been
the cause of many bugs.

In addition there was no performance benefit being gained since the
disk blocks in question were cached anyway. So this patch removes
it in order to simplify the code to prepare for other changes which
would otherwise have had to add further support for this feature.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 110f03d..ba12423 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -56,7 +56,7 @@ static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
 		bd = list_entry(head->next, struct gfs2_bufdata,
 				bd_ail_gl_list);
 		bh = bd->bd_bh;
-		gfs2_remove_from_ail(NULL, bd);
+		gfs2_remove_from_ail(bd);
 		bd->bd_bh = NULL;
 		bh->b_private = NULL;
 		bd->bd_blkno = bh->b_blocknr;
@@ -287,23 +287,6 @@ static int inode_go_lock(struct gfs2_holder *gh)
 }
 
 /**
- * inode_go_unlock - operation done before an inode lock is unlocked by a
- *		     process
- * @gl: the glock
- * @flags:
- *
- */
-
-static void inode_go_unlock(struct gfs2_holder *gh)
-{
-	struct gfs2_glock *gl = gh->gh_gl;
-	struct gfs2_inode *ip = gl->gl_object;
-
-	if (ip)
-		gfs2_meta_cache_flush(ip);
-}
-
-/**
  * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock
  * @gl: the glock
  *
@@ -377,7 +360,6 @@ static void trans_go_xmote_bh(struct gfs2_glock *gl)
 
 	if (gl->gl_state != LM_ST_UNLOCKED &&
 	    test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
-		gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode));
 		j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 
 		error = gfs2_find_jhead(sdp->sd_jdesc, &head);
@@ -437,7 +419,6 @@ const struct gfs2_glock_operations gfs2_inode_glops = {
 	.go_inval = inode_go_inval,
 	.go_demote_ok = inode_go_demote_ok,
 	.go_lock = inode_go_lock,
-	.go_unlock = inode_go_unlock,
 	.go_type = LM_TYPE_INODE,
 	.go_min_hold_time = HZ / 10,
 };
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 55c72f0..5662ff9 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -275,8 +275,6 @@ struct gfs2_inode {
 	spinlock_t i_spin;
 	struct rw_semaphore i_rw_mutex;
 	unsigned long i_last_pfault;
-
-	struct buffer_head *i_cache[GFS2_MAX_META_HEIGHT];
 };
 
 /*
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index ad0fe37..af493fc 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -293,11 +293,6 @@ static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
 	return 0;
 }
 
-static void gfs2_inode_bh(struct gfs2_inode *ip, struct buffer_head *bh)
-{
-	ip->i_cache[0] = bh;
-}
-
 /**
  * gfs2_inode_refresh - Refresh the incore copy of the dinode
  * @ip: The GFS2 inode
@@ -965,7 +960,7 @@ struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
 	struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
 	int error;
 	u64 generation;
-	struct buffer_head *bh=NULL;
+	struct buffer_head *bh = NULL;
 
 	if (!name->len || name->len > GFS2_FNAMESIZE)
 		return ERR_PTR(-ENAMETOOLONG);
@@ -1002,8 +997,6 @@ struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
 	if (IS_ERR(inode))
 		goto fail_gunlock2;
 
-	gfs2_inode_bh(GFS2_I(inode), bh);
-
 	error = gfs2_inode_refresh(GFS2_I(inode));
 	if (error)
 		goto fail_gunlock2;
@@ -1020,6 +1013,8 @@ struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
 	if (error)
 		goto fail_gunlock2;
 
+	if (bh)
+		brelse(bh);
 	if (!inode)
 		return ERR_PTR(-ENOMEM);
 	return inode;
@@ -1031,6 +1026,8 @@ fail_gunlock2:
 fail_gunlock:
 	gfs2_glock_dq(ghs);
 fail:
+	if (bh)
+		brelse(bh);
 	return ERR_PTR(error);
 }
 
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 7df7024..70b404d 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -68,14 +68,12 @@ unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
  *
  */
 
-void gfs2_remove_from_ail(struct address_space *mapping, struct gfs2_bufdata *bd)
+void gfs2_remove_from_ail(struct gfs2_bufdata *bd)
 {
 	bd->bd_ail = NULL;
 	list_del_init(&bd->bd_ail_st_list);
 	list_del_init(&bd->bd_ail_gl_list);
 	atomic_dec(&bd->bd_gl->gl_ail_count);
-	if (mapping)
-		gfs2_meta_cache_flush(GFS2_I(mapping->host));
 	brelse(bd->bd_bh);
 }
 
@@ -248,7 +246,7 @@ static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 		bd = list_entry(head->prev, struct gfs2_bufdata,
 				bd_ail_st_list);
 		gfs2_assert(sdp, bd->bd_ail == ai);
-		gfs2_remove_from_ail(bd->bd_bh->b_page->mapping, bd);
+		gfs2_remove_from_ail(bd);
 	}
 }
 
diff --git a/fs/gfs2/log.h b/fs/gfs2/log.h
index dae2824..24e7161 100644
--- a/fs/gfs2/log.h
+++ b/fs/gfs2/log.h
@@ -59,7 +59,7 @@ struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
 				      struct buffer_head *real);
 void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl);
 void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *trans);
-void gfs2_remove_from_ail(struct address_space *mapping, struct gfs2_bufdata *bd);
+void gfs2_remove_from_ail(struct gfs2_bufdata *bd);
 
 void gfs2_log_shutdown(struct gfs2_sbd *sdp);
 void gfs2_meta_syncfs(struct gfs2_sbd *sdp);
diff --git a/fs/gfs2/main.c b/fs/gfs2/main.c
index 7ecfe0d..653fd5a 100644
--- a/fs/gfs2/main.c
+++ b/fs/gfs2/main.c
@@ -31,7 +31,6 @@ static void gfs2_init_inode_once(struct kmem_cache *cachep, void *foo)
 	inode_init_once(&ip->i_inode);
 	spin_lock_init(&ip->i_spin);
 	init_rwsem(&ip->i_rw_mutex);
-	memset(ip->i_cache, 0, sizeof(ip->i_cache));
 }
 
 static void gfs2_init_glock_once(struct kmem_cache *cachep, void *foo)
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 4da4239..01ef902 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -317,7 +317,7 @@ void gfs2_remove_from_journal(struct buffer_head *bh, struct gfs2_trans *tr, int
 	}
 	if (bd) {
 		if (bd->bd_ail) {
-			gfs2_remove_from_ail(NULL, bd);
+			gfs2_remove_from_ail(bd);
 			bh->b_private = NULL;
 			bd->bd_bh = NULL;
 			bd->bd_blkno = bh->b_blocknr;
@@ -358,32 +358,6 @@ void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen)
 }
 
 /**
- * gfs2_meta_cache_flush - get rid of any references on buffers for this inode
- * @ip: The GFS2 inode
- *
- * This releases buffers that are in the most-recently-used array of
- * blocks used for indirect block addressing for this inode.
- */
-
-void gfs2_meta_cache_flush(struct gfs2_inode *ip)
-{
-	struct buffer_head **bh_slot;
-	unsigned int x;
-
-	spin_lock(&ip->i_spin);
-
-	for (x = 0; x < GFS2_MAX_META_HEIGHT; x++) {
-		bh_slot = &ip->i_cache[x];
-		if (*bh_slot) {
-			brelse(*bh_slot);
-			*bh_slot = NULL;
-		}
-	}
-
-	spin_unlock(&ip->i_spin);
-}
-
-/**
  * gfs2_meta_indirect_buffer - Get a metadata buffer
  * @ip: The GFS2 inode
  * @height: The level of this buf in the metadata (indir addr) tree (if any)
@@ -391,8 +365,6 @@ void gfs2_meta_cache_flush(struct gfs2_inode *ip)
  * @new: Non-zero if we may create a new buffer
  * @bhp: the buffer is returned here
  *
- * Try to use the gfs2_inode's MRU metadata tree cache.
- *
  * Returns: errno
  */
 
@@ -401,58 +373,25 @@ int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
 {
 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct gfs2_glock *gl = ip->i_gl;
-	struct buffer_head *bh = NULL, **bh_slot = ip->i_cache + height;
-	int in_cache = 0;
-
-	BUG_ON(!gl);
-	BUG_ON(!sdp);
-
-	spin_lock(&ip->i_spin);
-	if (*bh_slot && (*bh_slot)->b_blocknr == num) {
-		bh = *bh_slot;
-		get_bh(bh);
-		in_cache = 1;
-	}
-	spin_unlock(&ip->i_spin);
-
-	if (!bh)
-		bh = getbuf(gl, num, CREATE);
-
-	if (!bh)
-		return -ENOBUFS;
+	struct buffer_head *bh;
+	int ret = 0;
 
 	if (new) {
-		if (gfs2_assert_warn(sdp, height))
-			goto err;
-		meta_prep_new(bh);
+		BUG_ON(height == 0);
+		bh = gfs2_meta_new(gl, num);
 		gfs2_trans_add_bh(ip->i_gl, bh, 1);
 		gfs2_metatype_set(bh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
 		gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
 	} else {
 		u32 mtype = height ? GFS2_METATYPE_IN : GFS2_METATYPE_DI;
-		if (!buffer_uptodate(bh)) {
-			ll_rw_block(READ_META, 1, &bh);
-			if (gfs2_meta_wait(sdp, bh))
-				goto err;
+		ret = gfs2_meta_read(gl, num, DIO_WAIT, &bh);
+		if (ret == 0 && gfs2_metatype_check(sdp, bh, mtype)) {
+			brelse(bh);
+			ret = -EIO;
 		}
-		if (gfs2_metatype_check(sdp, bh, mtype))
-			goto err;
-	}
-
-	if (!in_cache) {
-		spin_lock(&ip->i_spin);
-		if (*bh_slot)
-			brelse(*bh_slot);
-		*bh_slot = bh;
-		get_bh(bh);
-		spin_unlock(&ip->i_spin);
 	}
-
 	*bhp = bh;
-	return 0;
-err:
-	brelse(bh);
-	return -EIO;
+	return ret;
 }
 
 /**
diff --git a/fs/gfs2/meta_io.h b/fs/gfs2/meta_io.h
index b704822..73e3b1c 100644
--- a/fs/gfs2/meta_io.h
+++ b/fs/gfs2/meta_io.h
@@ -56,7 +56,6 @@ void gfs2_remove_from_journal(struct buffer_head *bh, struct gfs2_trans *tr,
 
 void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen);
 
-void gfs2_meta_cache_flush(struct gfs2_inode *ip);
 int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
 			      int new, struct buffer_head **bhp);
 
diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index 1696e5d..4c4ef7f 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -154,7 +154,6 @@ static int gfs2_writepage(struct page *page, struct writeback_control *wbc)
 	error = block_write_full_page(page, gfs2_get_block_noalloc, wbc);
 	if (done_trans)
 		gfs2_trans_end(sdp);
-	gfs2_meta_cache_flush(ip);
 	return error;
 
 out_ignore:
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index dd3e737..5183dfb 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -543,7 +543,6 @@ int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
 	if (error)
 		return error;
 
-	gfs2_meta_cache_flush(ip);
 	j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 
 	error = gfs2_find_jhead(sdp->sd_jdesc, &head);
-- 
1.5.1.2

[PATCH 05/58] [GFS2] Remove unused field in struct gfs2_inode

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

Removes a field that is not used.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 5662ff9..e53da7d 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -274,7 +274,6 @@ struct gfs2_inode {
 
 	spinlock_t i_spin;
 	struct rw_semaphore i_rw_mutex;
-	unsigned long i_last_pfault;
 };
 
 /*
diff --git a/fs/gfs2/ops_super.c b/fs/gfs2/ops_super.c
index 950f314..5e52421 100644
--- a/fs/gfs2/ops_super.c
+++ b/fs/gfs2/ops_super.c
@@ -487,7 +487,6 @@ static struct inode *gfs2_alloc_inode(struct super_block *sb)
 	if (ip) {
 		ip->i_flags = 0;
 		ip->i_gl = NULL;
-		ip->i_last_pfault = jiffies;
 	}
 	return &ip->i_inode;
 }
-- 
1.5.1.2

[PATCH 06/58] [GFS2] Add gfs2_is_writeback()

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

This adds a function "gfs2_is_writeback()" along the lines of the
existing "gfs2_is_jdata()" in order to clean up the code and make
the various tests for the inode mode more obvious. It also fixes
the PageChecked() logic where we were resetting the flag too early
in the case of an error path.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 93fa427..1cfd493 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -59,7 +59,6 @@ struct strip_mine {
 static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
 			       u64 block, struct page *page)
 {
-	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct inode *inode = &ip->i_inode;
 	struct buffer_head *bh;
 	int release = 0;
@@ -95,7 +94,7 @@ static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
 	set_buffer_uptodate(bh);
 	if (!gfs2_is_jdata(ip))
 		mark_buffer_dirty(bh);
-	if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip))
+	if (!gfs2_is_writeback(ip))
 		gfs2_trans_add_bh(ip->i_gl, bh, 0);
 
 	if (release) {
@@ -879,7 +878,6 @@ static int gfs2_block_truncate_page(struct address_space *mapping)
 {
 	struct inode *inode = mapping->host;
 	struct gfs2_inode *ip = GFS2_I(inode);
-	struct gfs2_sbd *sdp = GFS2_SB(inode);
 	loff_t from = inode->i_size;
 	unsigned long index = from >> PAGE_CACHE_SHIFT;
 	unsigned offset = from & (PAGE_CACHE_SIZE-1);
@@ -931,7 +929,7 @@ static int gfs2_block_truncate_page(struct address_space *mapping)
 		err = 0;
 	}
 
-	if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip))
+	if (!gfs2_is_writeback(ip))
 		gfs2_trans_add_bh(ip->i_gl, bh, 0);
 
 	zero_user_page(page, offset, length, KM_USER0);
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index e53da7d..82dfe9b 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -285,7 +285,7 @@ static inline struct gfs2_inode *GFS2_I(struct inode *inode)
 	return container_of(inode, struct gfs2_inode, i_inode);
 }
 
-static inline struct gfs2_sbd *GFS2_SB(struct inode *inode)
+static inline struct gfs2_sbd *GFS2_SB(const struct inode *inode)
 {
 	return inode->i_sb->s_fs_info;
 }
diff --git a/fs/gfs2/inode.h b/fs/gfs2/inode.h
index 351ac87..bed3dc2 100644
--- a/fs/gfs2/inode.h
+++ b/fs/gfs2/inode.h
@@ -20,6 +20,12 @@ static inline int gfs2_is_jdata(const struct gfs2_inode *ip)
 	return ip->i_di.di_flags & GFS2_DIF_JDATA;
 }
 
+static inline int gfs2_is_writeback(const struct gfs2_inode *ip)
+{
+	const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+	return (sdp->sd_args.ar_data == GFS2_DATA_WRITEBACK) && !gfs2_is_jdata(ip);
+}
+
 static inline int gfs2_is_dir(const struct gfs2_inode *ip)
 {
 	return S_ISDIR(ip->i_inode.i_mode);
diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index 4c4ef7f..ed154af 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -138,12 +138,11 @@ static int gfs2_writepage(struct page *page, struct writeback_control *wbc)
 		return 0; /* don't care */
 	}
 
-	if ((sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) &&
-	    PageChecked(page)) {
-		ClearPageChecked(page);
+	if (PageChecked(page)) {
 		error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0);
 		if (error)
 			goto out_ignore;
+		ClearPageChecked(page);
 		if (!page_has_buffers(page)) {
 			create_empty_buffers(page, inode->i_sb->s_blocksize,
 					     (1 << BH_Dirty)|(1 << BH_Uptodate));
@@ -180,9 +179,8 @@ static int gfs2_writepages(struct address_space *mapping,
 {
 	struct inode *inode = mapping->host;
 	struct gfs2_inode *ip = GFS2_I(inode);
-	struct gfs2_sbd *sdp = GFS2_SB(inode);
 
-	if (sdp->sd_args.ar_data == GFS2_DATA_WRITEBACK && !gfs2_is_jdata(ip))
+	if (gfs2_is_writeback(ip))
 		return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc);
 
 	return generic_writepages(mapping, wbc);
@@ -606,7 +604,7 @@ static int gfs2_write_end(struct file *file, struct address_space *mapping,
 	if (gfs2_is_stuffed(ip))
 		return gfs2_stuffed_write_end(inode, dibh, pos, len, copied, page);
 
-	if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip))
+	if (!gfs2_is_writeback(ip))
 		gfs2_page_add_databufs(ip, page, from, to);
 
 	ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
-- 
1.5.1.2

[PATCH 07/58] [GFS2] Introduce gfs2_set_aops()

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

Just like ext3 we now have three sets of address space operations
to cover the cases of writeback, ordered and journalled data
writes. This means that the individual operations can now become
less complicated as we are able to remove some of the tests for
file data mode from the code.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index af493fc..532784e 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -136,7 +136,6 @@ void gfs2_set_iop(struct inode *inode)
 	if (S_ISREG(mode)) {
 		inode->i_op = &gfs2_file_iops;
 		inode->i_fop = &gfs2_file_fops;
-		inode->i_mapping->a_ops = &gfs2_file_aops;
 	} else if (S_ISDIR(mode)) {
 		inode->i_op = &gfs2_dir_iops;
 		inode->i_fop = &gfs2_dir_fops;
@@ -290,6 +289,9 @@ static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
 	di->di_entries = be32_to_cpu(str->di_entries);
 
 	di->di_eattr = be64_to_cpu(str->di_eattr);
+	if (S_ISREG(ip->i_inode.i_mode))
+		gfs2_set_aops(&ip->i_inode);
+
 	return 0;
 }
 
diff --git a/fs/gfs2/inode.h b/fs/gfs2/inode.h
index bed3dc2..d446506 100644
--- a/fs/gfs2/inode.h
+++ b/fs/gfs2/inode.h
@@ -26,6 +26,12 @@ static inline int gfs2_is_writeback(const struct gfs2_inode *ip)
 	return (sdp->sd_args.ar_data == GFS2_DATA_WRITEBACK) && !gfs2_is_jdata(ip);
 }
 
+static inline int gfs2_is_ordered(const struct gfs2_inode *ip)
+{
+	const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+	return (sdp->sd_args.ar_data == GFS2_DATA_ORDERED) && !gfs2_is_jdata(ip);
+}
+
 static inline int gfs2_is_dir(const struct gfs2_inode *ip)
 {
 	return S_ISDIR(ip->i_inode.i_mode);
diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index ed154af..207014f 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -162,28 +162,18 @@ out_ignore:
 }
 
 /**
- * gfs2_writepages - Write a bunch of dirty pages back to disk
+ * gfs2_writeback_writepages - Write a bunch of dirty pages back to disk
  * @mapping: The mapping to write
  * @wbc: Write-back control
  *
- * For journaled files and/or ordered writes this just falls back to the
- * kernel's default writepages path for now. We will probably want to change
- * that eventually (i.e. when we look at allocate on flush).
- *
- * For the data=writeback case though we can already ignore buffer heads
+ * For the data=writeback case we can already ignore buffer heads
  * and write whole extents at once. This is a big reduction in the
  * number of I/O requests we send and the bmap calls we make in this case.
  */
-static int gfs2_writepages(struct address_space *mapping,
-			   struct writeback_control *wbc)
+static int gfs2_writeback_writepages(struct address_space *mapping,
+				     struct writeback_control *wbc)
 {
-	struct inode *inode = mapping->host;
-	struct gfs2_inode *ip = GFS2_I(inode);
-
-	if (gfs2_is_writeback(ip))
-		return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc);
-
-	return generic_writepages(mapping, wbc);
+	return mpage_writepages(mapping, wbc, gfs2_get_block_noalloc);
 }
 
 /**
@@ -644,11 +634,7 @@ failed:
  
 static int gfs2_set_page_dirty(struct page *page)
 {
-	struct gfs2_inode *ip = GFS2_I(page->mapping->host);
-	struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
-
-	if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip))
-		SetPageChecked(page);
+	SetPageChecked(page);
 	return __set_page_dirty_buffers(page);
 }
 
@@ -738,13 +724,9 @@ static int gfs2_ok_for_dio(struct gfs2_inode *ip, int rw, loff_t offset)
 {
 	/*
 	 * Should we return an error here? I can't see that O_DIRECT for
-	 * a journaled file makes any sense. For now we'll silently fall
-	 * back to buffered I/O, likewise we do the same for stuffed
-	 * files since they are (a) small and (b) unaligned.
+	 * a stuffed file makes any sense. For now we'll silently fall
+	 * back to buffered I/O
 	 */
-	if (gfs2_is_jdata(ip))
-		return 0;
-
 	if (gfs2_is_stuffed(ip))
 		return 0;
 
@@ -855,9 +837,22 @@ cannot_release:
 	return 0;
 }
 
-const struct address_space_operations gfs2_file_aops = {
+static const struct address_space_operations gfs2_writeback_aops = {
+	.writepage = gfs2_writepage,
+	.writepages = gfs2_writeback_writepages,
+	.readpage = gfs2_readpage,
+	.readpages = gfs2_readpages,
+	.sync_page = block_sync_page,
+	.write_begin = gfs2_write_begin,
+	.write_end = gfs2_write_end,
+	.bmap = gfs2_bmap,
+	.invalidatepage = gfs2_invalidatepage,
+	.releasepage = gfs2_releasepage,
+	.direct_IO = gfs2_direct_IO,
+};
+
+static const struct address_space_operations gfs2_ordered_aops = {
 	.writepage = gfs2_writepage,
-	.writepages = gfs2_writepages,
 	.readpage = gfs2_readpage,
 	.readpages = gfs2_readpages,
 	.sync_page = block_sync_page,
@@ -870,3 +865,30 @@ const struct address_space_operations gfs2_file_aops = {
 	.direct_IO = gfs2_direct_IO,
 };
 
+static const struct address_space_operations gfs2_jdata_aops = {
+	.writepage = gfs2_writepage,
+	.readpage = gfs2_readpage,
+	.readpages = gfs2_readpages,
+	.sync_page = block_sync_page,
+	.write_begin = gfs2_write_begin,
+	.write_end = gfs2_write_end,
+	.set_page_dirty = gfs2_set_page_dirty,
+	.bmap = gfs2_bmap,
+	.invalidatepage = gfs2_invalidatepage,
+	.releasepage = gfs2_releasepage,
+};
+
+void gfs2_set_aops(struct inode *inode)
+{
+	struct gfs2_inode *ip = GFS2_I(inode);
+
+	if (gfs2_is_writeback(ip))
+		inode->i_mapping->a_ops = &gfs2_writeback_aops;
+	else if (gfs2_is_ordered(ip))
+		inode->i_mapping->a_ops = &gfs2_ordered_aops;
+	else if (gfs2_is_jdata(ip))
+		inode->i_mapping->a_ops = &gfs2_jdata_aops;
+	else
+		BUG();
+}
+
diff --git a/fs/gfs2/ops_address.h b/fs/gfs2/ops_address.h
index e8fe83f..d3b76d0 100644
--- a/fs/gfs2/ops_address.h
+++ b/fs/gfs2/ops_address.h
@@ -14,12 +14,12 @@
 #include <linux/buffer_head.h>
 #include <linux/mm.h>
 
-extern const struct address_space_operations gfs2_file_aops;
 extern int gfs2_get_block(struct inode *inode, sector_t lblock,
 			  struct buffer_head *bh_result, int create);
 extern int gfs2_releasepage(struct page *page, gfp_t gfp_mask);
 extern int gfs2_internal_read(struct gfs2_inode *ip,
 			      struct file_ra_state *ra_state,
 			      char *buf, loff_t *pos, unsigned size);
+extern void gfs2_set_aops(struct inode *inode);
 
 #endif /* __OPS_ADDRESS_DOT_H__ */
diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c
index 6f3aeb0..ad5daaa 100644
--- a/fs/gfs2/ops_file.c
+++ b/fs/gfs2/ops_file.c
@@ -38,6 +38,7 @@
 #include "trans.h"
 #include "util.h"
 #include "eaops.h"
+#include "ops_address.h"
 
 /**
  * gfs2_llseek - seek to a location in a file
@@ -245,7 +246,16 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
 		if (error)
 			goto out;
 	}
-
+	if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
+		if (flags & GFS2_DIF_JDATA)
+			gfs2_log_flush(sdp, ip->i_gl);
+		error = filemap_fdatawrite(inode->i_mapping);
+		if (error)
+			goto out;
+		error = filemap_fdatawait(inode->i_mapping);
+		if (error)
+			goto out;
+	}
 	error = gfs2_trans_begin(sdp, RES_DINODE, 0);
 	if (error)
 		goto out;
@@ -257,6 +267,7 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
 	gfs2_dinode_out(ip, bh->b_data);
 	brelse(bh);
 	gfs2_set_inode_flags(inode);
+	gfs2_set_aops(inode);
 out_trans_end:
 	gfs2_trans_end(sdp);
 out:
-- 
1.5.1.2

[PATCH 08/58] [GFS2] Split gfs2_writepage into three cases

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

This patch splits gfs2_writepage into separate functions for each of
the three cases: writeback, ordered and journalled. As a result
it becomes a lot easier to see what each one is doing. The common
code is moved into gfs2_writepage_common.

This fixes a performance bug where we were doing more work than
strictly required in the ordered write case.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index 6c27cea..e901f8f 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -556,17 +556,20 @@ static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 
 	lock_buffer(bd->bd_bh);
 	gfs2_log_lock(sdp);
-	if (!list_empty(&bd->bd_list_tr))
-		goto out;
-	tr->tr_touched = 1;
-	if (gfs2_is_jdata(ip)) {
-		tr->tr_num_buf++;
-		list_add(&bd->bd_list_tr, &tr->tr_list_buf);
+	if (tr) {
+		if (!list_empty(&bd->bd_list_tr))
+			goto out;
+		tr->tr_touched = 1;
+		if (gfs2_is_jdata(ip)) {
+			tr->tr_num_buf++;
+			list_add(&bd->bd_list_tr, &tr->tr_list_buf);
+		}
 	}
 	if (!list_empty(&le->le_list))
 		goto out;
 
-	__glock_lo_add(sdp, &bd->bd_gl->gl_le);
+	if (tr)
+		__glock_lo_add(sdp, &bd->bd_gl->gl_le);
 	if (gfs2_is_jdata(ip)) {
 		gfs2_pin(sdp, bd->bd_bh);
 		tr->tr_num_databuf_new++;
diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index 207014f..4bf73ed 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -103,16 +103,15 @@ static int gfs2_get_block_direct(struct inode *inode, sector_t lblock,
 }
 
 /**
- * gfs2_writepage - Write complete page
- * @page: Page to write
- *
- * Returns: errno
+ * gfs2_writepage_common - Common bits of writepage
+ * @page: The page to be written
+ * @wbc: The writeback control
  *
- * Some of this is copied from block_write_full_page() although we still
- * call it to do most of the work.
+ * Returns: 1 if writepage is ok, otherwise an error code or zero if no error.
  */
 
-static int gfs2_writepage(struct page *page, struct writeback_control *wbc)
+static int gfs2_writepage_common(struct page *page,
+				 struct writeback_control *wbc)
 {
 	struct inode *inode = page->mapping->host;
 	struct gfs2_inode *ip = GFS2_I(inode);
@@ -120,23 +119,94 @@ static int gfs2_writepage(struct page *page, struct writeback_control *wbc)
 	loff_t i_size = i_size_read(inode);
 	pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
 	unsigned offset;
-	int error;
-	int done_trans = 0;
+	int ret = -EIO;
 
-	if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl))) {
-		unlock_page(page);
-		return -EIO;
-	}
+	if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(ip->i_gl)))
+		goto out;
+	ret = 0;
 	if (current->journal_info)
-		goto out_ignore;
-
+		goto redirty;
 	/* Is the page fully outside i_size? (truncate in progress) */
-        offset = i_size & (PAGE_CACHE_SIZE-1);
+	offset = i_size & (PAGE_CACHE_SIZE-1);
 	if (page->index > end_index || (page->index == end_index && !offset)) {
 		page->mapping->a_ops->invalidatepage(page, 0);
-		unlock_page(page);
-		return 0; /* don't care */
+		goto out;
 	}
+	return 1;
+redirty:
+	redirty_page_for_writepage(wbc, page);
+out:
+	unlock_page(page);
+	return 0;
+}
+
+/**
+ * gfs2_writeback_writepage - Write page for writeback mappings
+ * @page: The page
+ * @wbc: The writeback control
+ *
+ */
+
+static int gfs2_writeback_writepage(struct page *page,
+				    struct writeback_control *wbc)
+{
+	int ret;
+
+	ret = gfs2_writepage_common(page, wbc);
+	if (ret <= 0)
+		return ret;
+
+	ret = mpage_writepage(page, gfs2_get_block_noalloc, wbc);
+	if (ret == -EAGAIN)
+		ret = block_write_full_page(page, gfs2_get_block_noalloc, wbc);
+	return ret;
+}
+
+/**
+ * gfs2_ordered_writepage - Write page for ordered data files
+ * @page: The page to write
+ * @wbc: The writeback control
+ *
+ */
+
+static int gfs2_ordered_writepage(struct page *page,
+				  struct writeback_control *wbc)
+{
+	struct inode *inode = page->mapping->host;
+	struct gfs2_inode *ip = GFS2_I(inode);
+	int ret;
+
+	ret = gfs2_writepage_common(page, wbc);
+	if (ret <= 0)
+		return ret;
+
+	if (!page_has_buffers(page)) {
+		create_empty_buffers(page, inode->i_sb->s_blocksize,
+				     (1 << BH_Dirty)|(1 << BH_Uptodate));
+	}
+	gfs2_page_add_databufs(ip, page, 0, inode->i_sb->s_blocksize-1);
+	return block_write_full_page(page, gfs2_get_block_noalloc, wbc);
+}
+
+/**
+ * gfs2_jdata_writepage - Write complete page
+ * @page: Page to write
+ *
+ * Returns: errno
+ *
+ */
+
+static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
+{
+	struct inode *inode = page->mapping->host;
+	struct gfs2_inode *ip = GFS2_I(inode);
+	struct gfs2_sbd *sdp = GFS2_SB(inode);
+	int error;
+	int done_trans = 0;
+
+	error = gfs2_writepage_common(page, wbc);
+	if (error <= 0)
+		return error;
 
 	if (PageChecked(page)) {
 		error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0);
@@ -838,7 +908,7 @@ cannot_release:
 }
 
 static const struct address_space_operations gfs2_writeback_aops = {
-	.writepage = gfs2_writepage,
+	.writepage = gfs2_writeback_writepage,
 	.writepages = gfs2_writeback_writepages,
 	.readpage = gfs2_readpage,
 	.readpages = gfs2_readpages,
@@ -852,7 +922,7 @@ static const struct address_space_operations gfs2_writeback_aops = {
 };
 
 static const struct address_space_operations gfs2_ordered_aops = {
-	.writepage = gfs2_writepage,
+	.writepage = gfs2_ordered_writepage,
 	.readpage = gfs2_readpage,
 	.readpages = gfs2_readpages,
 	.sync_page = block_sync_page,
@@ -866,7 +936,7 @@ static const struct address_space_operations gfs2_ordered_aops = {
 };
 
 static const struct address_space_operations gfs2_jdata_aops = {
-	.writepage = gfs2_writepage,
+	.writepage = gfs2_jdata_writepage,
 	.readpage = gfs2_readpage,
 	.readpages = gfs2_readpages,
 	.sync_page = block_sync_page,
-- 
1.5.1.2

[PATCH 09/58] [GFS2] Add writepages for GFS2 jdata

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

This patch resolves a lock ordering issue where we had been getting
a transaction lock in the wrong order with respect to the page lock.
By using writepages rather than just writepage, it is then possible
to start a transaction before locking the page, and thus matching the
locking order elsewhere in the code.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 70b404d..1e1fe8d 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -650,7 +650,7 @@ static void gfs2_ordered_write(struct gfs2_sbd *sdp)
 		get_bh(bh);
 		gfs2_log_unlock(sdp);
 		lock_buffer(bh);
-		if (test_clear_buffer_dirty(bh)) {
+		if (buffer_mapped(bh) && test_clear_buffer_dirty(bh)) {
 			bh->b_end_io = end_buffer_write_sync;
 			submit_bh(WRITE, bh);
 		} else {
diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index 4bf73ed..48913e5 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -21,6 +21,7 @@
 #include <linux/gfs2_ondisk.h>
 #include <linux/lm_interface.h>
 #include <linux/swap.h>
+#include <linux/pagevec.h>
 
 #include "gfs2.h"
 #include "incore.h"
@@ -189,6 +190,34 @@ static int gfs2_ordered_writepage(struct page *page,
 }
 
 /**
+ * __gfs2_jdata_writepage - The core of jdata writepage
+ * @page: The page to write
+ * @wbc: The writeback control
+ *
+ * This is shared between writepage and writepages and implements the
+ * core of the writepage operation. If a transaction is required then
+ * PageChecked will have been set and the transaction will have
+ * already been started before this is called.
+ */
+
+static int __gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
+{
+	struct inode *inode = page->mapping->host;
+	struct gfs2_inode *ip = GFS2_I(inode);
+	struct gfs2_sbd *sdp = GFS2_SB(inode);
+
+	if (PageChecked(page)) {
+		ClearPageChecked(page);
+		if (!page_has_buffers(page)) {
+			create_empty_buffers(page, inode->i_sb->s_blocksize,
+					     (1 << BH_Dirty)|(1 << BH_Uptodate));
+		}
+		gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1);
+	}
+	return block_write_full_page(page, gfs2_get_block_noalloc, wbc);
+}
+
+/**
  * gfs2_jdata_writepage - Write complete page
  * @page: Page to write
  *
@@ -199,7 +228,6 @@ static int gfs2_ordered_writepage(struct page *page,
 static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc)
 {
 	struct inode *inode = page->mapping->host;
-	struct gfs2_inode *ip = GFS2_I(inode);
 	struct gfs2_sbd *sdp = GFS2_SB(inode);
 	int error;
 	int done_trans = 0;
@@ -209,18 +237,14 @@ static int gfs2_jdata_writepage(struct page *page, struct writeback_control *wbc
 		return error;
 
 	if (PageChecked(page)) {
+		if (wbc->sync_mode != WB_SYNC_ALL)
+			goto out_ignore;
 		error = gfs2_trans_begin(sdp, RES_DINODE + 1, 0);
 		if (error)
 			goto out_ignore;
-		ClearPageChecked(page);
-		if (!page_has_buffers(page)) {
-			create_empty_buffers(page, inode->i_sb->s_blocksize,
-					     (1 << BH_Dirty)|(1 << BH_Uptodate));
-		}
-		gfs2_page_add_databufs(ip, page, 0, sdp->sd_vfs->s_blocksize-1);
 		done_trans = 1;
 	}
-	error = block_write_full_page(page, gfs2_get_block_noalloc, wbc);
+	error = __gfs2_jdata_writepage(page, wbc);
 	if (done_trans)
 		gfs2_trans_end(sdp);
 	return error;
@@ -247,6 +271,178 @@ static int gfs2_writeback_writepages(struct address_space *mapping,
 }
 
 /**
+ * gfs2_write_jdata_pagevec - Write back a pagevec's worth of pages
+ * @mapping: The mapping
+ * @wbc: The writeback control
+ * @writepage: The writepage function to call for each page
+ * @pvec: The vector of pages
+ * @nr_pages: The number of pages to write
+ *
+ * Returns: non-zero if loop should terminate, zero otherwise
+ */
+
+static int gfs2_write_jdata_pagevec(struct address_space *mapping,
+				    struct writeback_control *wbc,
+				    struct pagevec *pvec,
+				    int nr_pages, pgoff_t end)
+{
+	struct inode *inode = mapping->host;
+	struct gfs2_sbd *sdp = GFS2_SB(inode);
+	loff_t i_size = i_size_read(inode);
+	pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
+	unsigned offset = i_size & (PAGE_CACHE_SIZE-1);
+	unsigned nrblocks = nr_pages * (PAGE_CACHE_SIZE/inode->i_sb->s_blocksize);
+	struct backing_dev_info *bdi = mapping->backing_dev_info;
+	int i;
+	int ret;
+
+	ret = gfs2_trans_begin(sdp, nrblocks, 0);
+	if (ret < 0)
+		return ret;
+
+	for(i = 0; i < nr_pages; i++) {
+		struct page *page = pvec->pages[i];
+
+		lock_page(page);
+
+		if (unlikely(page->mapping != mapping)) {
+			unlock_page(page);
+			continue;
+		}
+
+		if (!wbc->range_cyclic && page->index > end) {
+			ret = 1;
+			unlock_page(page);
+			continue;
+		}
+
+		if (wbc->sync_mode != WB_SYNC_NONE)
+			wait_on_page_writeback(page);
+
+		if (PageWriteback(page) ||
+		    !clear_page_dirty_for_io(page)) {
+			unlock_page(page);
+			continue;
+		}
+
+		/* Is the page fully outside i_size? (truncate in progress) */
+		if (page->index > end_index || (page->index == end_index && !offset)) {
+			page->mapping->a_ops->invalidatepage(page, 0);
+			unlock_page(page);
+			continue;
+		}
+
+		ret = __gfs2_jdata_writepage(page, wbc);
+
+		if (ret || (--(wbc->nr_to_write) <= 0))
+			ret = 1;
+		if (wbc->nonblocking && bdi_write_congested(bdi)) {
+			wbc->encountered_congestion = 1;
+			ret = 1;
+		}
+
+	}
+	gfs2_trans_end(sdp);
+	return ret;
+}
+
+/**
+ * gfs2_write_cache_jdata - Like write_cache_pages but different
+ * @mapping: The mapping to write
+ * @wbc: The writeback control
+ * @writepage: The writepage function to call
+ * @data: The data to pass to writepage
+ *
+ * The reason that we use our own function here is that we need to
+ * start transactions before we grab page locks. This allows us
+ * to get the ordering right.
+ */
+
+static int gfs2_write_cache_jdata(struct address_space *mapping,
+				  struct writeback_control *wbc)
+{
+	struct backing_dev_info *bdi = mapping->backing_dev_info;
+	int ret = 0;
+	int done = 0;
+	struct pagevec pvec;
+	int nr_pages;
+	pgoff_t index;
+	pgoff_t end;
+	int scanned = 0;
+	int range_whole = 0;
+
+	if (wbc->nonblocking && bdi_write_congested(bdi)) {
+		wbc->encountered_congestion = 1;
+		return 0;
+	}
+
+	pagevec_init(&pvec, 0);
+	if (wbc->range_cyclic) {
+		index = mapping->writeback_index; /* Start from prev offset */
+		end = -1;
+	} else {
+		index = wbc->range_start >> PAGE_CACHE_SHIFT;
+		end = wbc->range_end >> PAGE_CACHE_SHIFT;
+		if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
+			range_whole = 1;
+		scanned = 1;
+	}
+
+retry:
+	 while (!done && (index <= end) &&
+		(nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
+					       PAGECACHE_TAG_DIRTY,
+					       min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) {
+		scanned = 1;
+		ret = gfs2_write_jdata_pagevec(mapping, wbc, &pvec, nr_pages, end);
+		if (ret)
+			done = 1;
+		if (ret > 0)
+			ret = 0;
+
+		pagevec_release(&pvec);
+		cond_resched();
+	}
+
+	if (!scanned && !done) {
+		/*
+		 * We hit the last page and there is more work to be done: wrap
+		 * back to the start of the file
+		 */
+		scanned = 1;
+		index = 0;
+		goto retry;
+	}
+
+	if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
+		mapping->writeback_index = index;
+	return ret;
+}
+
+
+/**
+ * gfs2_jdata_writepages - Write a bunch of dirty pages back to disk
+ * @mapping: The mapping to write
+ * @wbc: The writeback control
+ * 
+ */
+
+static int gfs2_jdata_writepages(struct address_space *mapping,
+				 struct writeback_control *wbc)
+{
+	struct gfs2_inode *ip = GFS2_I(mapping->host);
+	struct gfs2_sbd *sdp = GFS2_SB(mapping->host);
+	int ret;
+
+	ret = gfs2_write_cache_jdata(mapping, wbc);
+	if (ret == 0 && wbc->sync_mode == WB_SYNC_ALL) {
+		gfs2_log_flush(sdp, ip->i_gl);
+		ret = gfs2_write_cache_jdata(mapping, wbc);
+	}
+	return ret;
+}
+
+/**
  * stuffed_readpage - Fill in a Linux page with stuffed file data
  * @ip: the inode
  * @page: the page
@@ -937,6 +1133,7 @@ static const struct address_space_operations gfs2_ordered_aops = {
 
 static const struct address_space_operations gfs2_jdata_aops = {
 	.writepage = gfs2_jdata_writepage,
+	.writepages = gfs2_jdata_writepages,
 	.readpage = gfs2_readpage,
 	.readpages = gfs2_readpages,
 	.sync_page = block_sync_page,
-- 
1.5.1.2

[PATCH 10/58] [GFS2] Don't hold page lock when starting transaction

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

This is an addendum to the new AOPs work which moves the point
at which we take the page lock so that we don't get it until
the last possible moment. This resolves a conflict between
starting transactions and the page lock.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index 48913e5..ae782d2 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -657,18 +657,10 @@ static int gfs2_write_begin(struct file *file, struct address_space *mapping,
 	if (unlikely(error))
 		goto out_uninit;
 
-	error = -ENOMEM;
-	page = __grab_cache_page(mapping, index);
-	*pagep = page;
-	if (!page)
-		goto out_unlock;
-
 	gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks);
-
 	error = gfs2_write_alloc_required(ip, pos, len, &alloc_required);
 	if (error)
-		goto out_putpage;
-
+		goto out_unlock;
 
 	ip->i_alloc.al_requested = 0;
 	if (alloc_required) {
@@ -699,40 +691,47 @@ static int gfs2_write_begin(struct file *file, struct address_space *mapping,
 	if (error)
 		goto out_trans_fail;
 
+	error = -ENOMEM;
+	page = __grab_cache_page(mapping, index);
+	*pagep = page;
+	if (unlikely(!page))
+		goto out_endtrans;
+
 	if (gfs2_is_stuffed(ip)) {
+		error = 0;
 		if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
 			error = gfs2_unstuff_dinode(ip, page);
 			if (error == 0)
 				goto prepare_write;
-		} else if (!PageUptodate(page))
+		} else if (!PageUptodate(page)) {
 			error = stuffed_readpage(ip, page);
+		}
 		goto out;
 	}
 
 prepare_write:
 	error = block_prepare_write(page, from, to, gfs2_get_block);
-
 out:
-	if (error) {
-		gfs2_trans_end(sdp);
+	if (error == 0)
+		return 0;
+
+	page_cache_release(page);
+	if (pos + len > ip->i_inode.i_size)
+		vmtruncate(&ip->i_inode, ip->i_inode.i_size);
+out_endtrans:
+	gfs2_trans_end(sdp);
 out_trans_fail:
-		if (alloc_required) {
-			gfs2_inplace_release(ip);
+	if (alloc_required) {
+		gfs2_inplace_release(ip);
 out_qunlock:
-			gfs2_quota_unlock(ip);
+		gfs2_quota_unlock(ip);
 out_alloc_put:
-			gfs2_alloc_put(ip);
-		}
-out_putpage:
-		page_cache_release(page);
-		if (pos + len > ip->i_inode.i_size)
-			vmtruncate(&ip->i_inode, ip->i_inode.i_size);
+		gfs2_alloc_put(ip);
+	}
 out_unlock:
-		gfs2_glock_dq_m(1, &ip->i_gh);
+	gfs2_glock_dq(&ip->i_gh);
 out_uninit:
-		gfs2_holder_uninit(&ip->i_gh);
-	}
-
+	gfs2_holder_uninit(&ip->i_gh);
 	return error;
 }
 
-- 
1.5.1.2

[PATCH 11/58] [GFS2] Use correct include file in ops_address.c

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

Something changed in the upstream kernel, and it needs this
one-liner to allow ops_address.c to build.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index ae782d2..7353933 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -20,7 +20,7 @@
 #include <linux/swap.h>
 #include <linux/gfs2_ondisk.h>
 #include <linux/lm_interface.h>
-#include <linux/swap.h>
+#include <linux/backing-dev.h>
 #include <linux/pagevec.h>
 
 #include "gfs2.h"
-- 
1.5.1.2

[PATCH 12/58] [GFS2] Remove unused variables

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

These haven't been used for some time, remove them.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 82dfe9b..f7a50fe 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -412,9 +412,6 @@ struct gfs2_args {
 struct gfs2_tune {
 	spinlock_t gt_spin;
 
-	unsigned int gt_ilimit;
-	unsigned int gt_ilimit_tries;
-	unsigned int gt_ilimit_min;
 	unsigned int gt_demote_secs; /* Cache retention for unheld glock */
 	unsigned int gt_incore_log_blocks;
 	unsigned int gt_log_flush_secs;
@@ -434,7 +431,6 @@ struct gfs2_tune {
 	unsigned int gt_new_files_jdata;
 	unsigned int gt_new_files_directio;
 	unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
-	unsigned int gt_lockdump_size;
 	unsigned int gt_stall_secs; /* Detects trouble! */
 	unsigned int gt_complain_secs;
 	unsigned int gt_reclaim_limit; /* Max num of glocks in reclaim list */
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 5183dfb..26edb7f 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -51,9 +51,6 @@ void gfs2_tune_init(struct gfs2_tune *gt)
 {
 	spin_lock_init(&gt->gt_spin);
 
-	gt->gt_ilimit = 100;
-	gt->gt_ilimit_tries = 3;
-	gt->gt_ilimit_min = 1;
 	gt->gt_demote_secs = 300;
 	gt->gt_incore_log_blocks = 1024;
 	gt->gt_log_flush_secs = 60;
@@ -71,7 +68,6 @@ void gfs2_tune_init(struct gfs2_tune *gt)
 	gt->gt_new_files_jdata = 0;
 	gt->gt_new_files_directio = 0;
 	gt->gt_max_readahead = 1 << 18;
-	gt->gt_lockdump_size = 131072;
 	gt->gt_stall_secs = 600;
 	gt->gt_complain_secs = 10;
 	gt->gt_reclaim_limit = 5000;
-- 
1.5.1.2

[PATCH 13/58] [GFS2] Remove "reclaim limit"

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

This call to reclaim glocks is not needed, and in particular we don't want it
in the fast path for locking glocks. The limit was entirely arbitrary anyway
and we can't expect users to adjust things like this, the remaining code will
do the right thing on its own.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 104e83f..159a547 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -507,21 +507,12 @@ static int rq_mutex(struct gfs2_holder *gh)
 static int rq_promote(struct gfs2_holder *gh)
 {
 	struct gfs2_glock *gl = gh->gh_gl;
-	struct gfs2_sbd *sdp = gl->gl_sbd;
 
 	if (!relaxed_state_ok(gl->gl_state, gh->gh_state, gh->gh_flags)) {
 		if (list_empty(&gl->gl_holders)) {
 			gl->gl_req_gh = gh;
 			set_bit(GLF_LOCK, &gl->gl_flags);
 			spin_unlock(&gl->gl_spin);
-
-			if (atomic_read(&sdp->sd_reclaim_count) >
-			    gfs2_tune_get(sdp, gt_reclaim_limit) &&
-			    !(gh->gh_flags & LM_FLAG_PRIORITY)) {
-				gfs2_reclaim_glock(sdp);
-				gfs2_reclaim_glock(sdp);
-			}
-
 			gfs2_glock_xmote_th(gh->gh_gl, gh);
 			spin_lock(&gl->gl_spin);
 		}
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index f7a50fe..089dba4 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -433,7 +433,6 @@ struct gfs2_tune {
 	unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
 	unsigned int gt_stall_secs; /* Detects trouble! */
 	unsigned int gt_complain_secs;
-	unsigned int gt_reclaim_limit; /* Max num of glocks in reclaim list */
 	unsigned int gt_statfs_quantum;
 	unsigned int gt_statfs_slow;
 };
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 26edb7f..548cc8b 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -70,7 +70,6 @@ void gfs2_tune_init(struct gfs2_tune *gt)
 	gt->gt_max_readahead = 1 << 18;
 	gt->gt_stall_secs = 600;
 	gt->gt_complain_secs = 10;
-	gt->gt_reclaim_limit = 5000;
 	gt->gt_statfs_quantum = 30;
 	gt->gt_statfs_slow = 0;
 }
diff --git a/fs/gfs2/sys.c b/fs/gfs2/sys.c
index 06e0b77..1359198 100644
--- a/fs/gfs2/sys.c
+++ b/fs/gfs2/sys.c
@@ -433,7 +433,6 @@ TUNE_ATTR(quota_quantum, 0);
 TUNE_ATTR(atime_quantum, 0);
 TUNE_ATTR(max_readahead, 0);
 TUNE_ATTR(complain_secs, 0);
-TUNE_ATTR(reclaim_limit, 0);
 TUNE_ATTR(statfs_slow, 0);
 TUNE_ATTR(new_files_jdata, 0);
 TUNE_ATTR(new_files_directio, 0);
@@ -456,7 +455,6 @@ static struct attribute *tune_attrs[] = {
 	&tune_attr_atime_quantum.attr,
 	&tune_attr_max_readahead.attr,
 	&tune_attr_complain_secs.attr,
-	&tune_attr_reclaim_limit.attr,
 	&tune_attr_statfs_slow.attr,
 	&tune_attr_quota_simul_sync.attr,
 	&tune_attr_quota_cache_secs.attr,
-- 
1.5.1.2

[PATCH 14/58] [GFS2] Add sync_page to metadata address space operations

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

This set of address space operations was missing a sync_page
operation.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 01ef902..4b1aced 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -50,6 +50,7 @@ static int gfs2_aspace_writepage(struct page *page,
 static const struct address_space_operations aspace_aops = {
 	.writepage = gfs2_aspace_writepage,
 	.releasepage = gfs2_releasepage,
+	.sync_page = block_sync_page,
 };
 
 /**
-- 
1.5.1.2

[PATCH 15/58] [GFS2] Reorder writeback for glock sync

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

Previously we were doing (write data, wait for data, write metadata, wait
for metadata). After this patch we so (write metadata, write data, wait for
data, wait for metadata) which should be more efficient.

Also I noticed that the drop_bh and xmote_bh functions were almost
identical. In fact the only difference was a single test, and that
test is such that in the drop_bh case, it would always evaluate to
the correct result. As such we can use the xmote_bh functions in
all the places where we were using the drop_bh function and remove
the drop_bh functions.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 159a547..e668808 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -947,8 +947,8 @@ static void gfs2_glock_drop_th(struct gfs2_glock *gl)
 	const struct gfs2_glock_operations *glops = gl->gl_ops;
 	unsigned int ret;
 
-	if (glops->go_drop_th)
-		glops->go_drop_th(gl);
+	if (glops->go_xmote_th)
+		glops->go_xmote_th(gl);
 
 	gfs2_assert_warn(sdp, test_bit(GLF_LOCK, &gl->gl_flags));
 	gfs2_assert_warn(sdp, list_empty(&gl->gl_holders));
@@ -1252,12 +1252,11 @@ void gfs2_glock_dq(struct gfs2_holder *gh)
 	list_del_init(&gh->gh_list);
 
 	if (list_empty(&gl->gl_holders)) {
-		spin_unlock(&gl->gl_spin);
-
-		if (glops->go_unlock)
+		if (glops->go_unlock) {
+			spin_unlock(&gl->gl_spin);
 			glops->go_unlock(gh);
-
-		spin_lock(&gl->gl_spin);
+			spin_lock(&gl->gl_spin);
+		}
 		gl->gl_stamp = jiffies;
 	}
 
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index ba12423..c663b7a 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -138,44 +138,34 @@ static void meta_go_inval(struct gfs2_glock *gl, int flags)
 static void inode_go_sync(struct gfs2_glock *gl)
 {
 	struct gfs2_inode *ip = gl->gl_object;
+	struct address_space *metamapping = gl->gl_aspace->i_mapping;
+	int error;
+
+	if (gl->gl_state != LM_ST_UNLOCKED)
+		gfs2_pte_inval(gl);
+	if (gl->gl_state != LM_ST_EXCLUSIVE)
+		return;
 
 	if (ip && !S_ISREG(ip->i_inode.i_mode))
 		ip = NULL;
 
 	if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
-		if (ip && !gfs2_is_jdata(ip))
-			filemap_fdatawrite(ip->i_inode.i_mapping);
 		gfs2_log_flush(gl->gl_sbd, gl);
-		if (ip && gfs2_is_jdata(ip))
-			filemap_fdatawrite(ip->i_inode.i_mapping);
-		gfs2_meta_sync(gl);
+		filemap_fdatawrite(metamapping);
 		if (ip) {
 			struct address_space *mapping = ip->i_inode.i_mapping;
-			int error = filemap_fdatawait(mapping);
+			filemap_fdatawrite(mapping);
+			error = filemap_fdatawait(mapping);
 			mapping_set_error(mapping, error);
 		}
+		error = filemap_fdatawait(metamapping);
+		mapping_set_error(metamapping, error);
 		clear_bit(GLF_DIRTY, &gl->gl_flags);
 		gfs2_ail_empty_gl(gl);
 	}
 }
 
 /**
- * inode_go_xmote_th - promote/demote a glock
- * @gl: the glock
- * @state: the requested state
- * @flags:
- *
- */
-
-static void inode_go_xmote_th(struct gfs2_glock *gl)
-{
-	if (gl->gl_state != LM_ST_UNLOCKED)
-		gfs2_pte_inval(gl);
-	if (gl->gl_state == LM_ST_EXCLUSIVE)
-		inode_go_sync(gl);
-}
-
-/**
  * inode_go_xmote_bh - After promoting/demoting a glock
  * @gl: the glock
  *
@@ -196,22 +186,6 @@ static void inode_go_xmote_bh(struct gfs2_glock *gl)
 }
 
 /**
- * inode_go_drop_th - unlock a glock
- * @gl: the glock
- *
- * Invoked from rq_demote().
- * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)
- * is being purged from our node's glock cache; we're dropping lock.
- */
-
-static void inode_go_drop_th(struct gfs2_glock *gl)
-{
-	gfs2_pte_inval(gl);
-	if (gl->gl_state == LM_ST_EXCLUSIVE)
-		inode_go_sync(gl);
-}
-
-/**
  * inode_go_inval - prepare a inode glock to be released
  * @gl: the glock
  * @flags:
@@ -326,14 +300,14 @@ static void rgrp_go_unlock(struct gfs2_holder *gh)
 }
 
 /**
- * trans_go_xmote_th - promote/demote the transaction glock
+ * trans_go_sync - promote/demote the transaction glock
  * @gl: the glock
  * @state: the requested state
  * @flags:
  *
  */
 
-static void trans_go_xmote_th(struct gfs2_glock *gl)
+static void trans_go_sync(struct gfs2_glock *gl)
 {
 	struct gfs2_sbd *sdp = gl->gl_sbd;
 
@@ -377,24 +351,6 @@ static void trans_go_xmote_bh(struct gfs2_glock *gl)
 }
 
 /**
- * trans_go_drop_th - unlock the transaction glock
- * @gl: the glock
- *
- * We want to sync the device even with localcaching.  Remember
- * that localcaching journal replay only marks buffers dirty.
- */
-
-static void trans_go_drop_th(struct gfs2_glock *gl)
-{
-	struct gfs2_sbd *sdp = gl->gl_sbd;
-
-	if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
-		gfs2_meta_syncfs(sdp);
-		gfs2_log_shutdown(sdp);
-	}
-}
-
-/**
  * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock
  * @gl: the glock
  *
@@ -408,14 +364,12 @@ static int quota_go_demote_ok(struct gfs2_glock *gl)
 
 const struct gfs2_glock_operations gfs2_meta_glops = {
 	.go_xmote_th = meta_go_sync,
-	.go_drop_th = meta_go_sync,
 	.go_type = LM_TYPE_META,
 };
 
 const struct gfs2_glock_operations gfs2_inode_glops = {
-	.go_xmote_th = inode_go_xmote_th,
+	.go_xmote_th = inode_go_sync,
 	.go_xmote_bh = inode_go_xmote_bh,
-	.go_drop_th = inode_go_drop_th,
 	.go_inval = inode_go_inval,
 	.go_demote_ok = inode_go_demote_ok,
 	.go_lock = inode_go_lock,
@@ -425,7 +379,6 @@ const struct gfs2_glock_operations gfs2_inode_glops = {
 
 const struct gfs2_glock_operations gfs2_rgrp_glops = {
 	.go_xmote_th = meta_go_sync,
-	.go_drop_th = meta_go_sync,
 	.go_inval = meta_go_inval,
 	.go_demote_ok = rgrp_go_demote_ok,
 	.go_lock = rgrp_go_lock,
@@ -435,9 +388,8 @@ const struct gfs2_glock_operations gfs2_rgrp_glops = {
 };
 
 const struct gfs2_glock_operations gfs2_trans_glops = {
-	.go_xmote_th = trans_go_xmote_th,
+	.go_xmote_th = trans_go_sync,
 	.go_xmote_bh = trans_go_xmote_bh,
-	.go_drop_th = trans_go_drop_th,
 	.go_type = LM_TYPE_NONDISK,
 };
 
-- 
1.5.1.2

[PATCH 16/58] [GFS2] Remove flags no longer required

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

The HIF_MUTEX and HIF_PROMOTE flags were set on the glock holders
depending upon which of the two waiters lists they were going to
be queued upon. They were then tested when the holders were taken
off the lists to ensure that the right type of holder was being
dequeued.

Since we are already using separate lists, there doesn't seem a
lot of point having these flags as well, and since setting them
and testing them is in the fast path for locking and unlocking
glock, this patch removes them.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index e668808..5fbd9d3 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -594,12 +594,7 @@ static void run_queue(struct gfs2_glock *gl)
 		if (!list_empty(&gl->gl_waiters1)) {
 			gh = list_entry(gl->gl_waiters1.next,
 					struct gfs2_holder, gh_list);
-
-			if (test_bit(HIF_MUTEX, &gh->gh_iflags))
-				blocked = rq_mutex(gh);
-			else
-				gfs2_assert_warn(gl->gl_sbd, 0);
-
+			blocked = rq_mutex(gh);
 		} else if (test_bit(GLF_DEMOTE, &gl->gl_flags)) {
 			blocked = rq_demote(gl);
 			if (gl->gl_waiters2 && !blocked) {
@@ -610,12 +605,7 @@ static void run_queue(struct gfs2_glock *gl)
 		} else if (!list_empty(&gl->gl_waiters3)) {
 			gh = list_entry(gl->gl_waiters3.next,
 					struct gfs2_holder, gh_list);
-
-			if (test_bit(HIF_PROMOTE, &gh->gh_iflags))
-				blocked = rq_promote(gh);
-			else
-				gfs2_assert_warn(gl->gl_sbd, 0);
-
+			blocked = rq_promote(gh);
 		} else
 			break;
 
@@ -636,7 +626,6 @@ static void gfs2_glmutex_lock(struct gfs2_glock *gl)
 	struct gfs2_holder gh;
 
 	gfs2_holder_init(gl, 0, 0, &gh);
-	set_bit(HIF_MUTEX, &gh.gh_iflags);
 	if (test_and_set_bit(HIF_WAIT, &gh.gh_iflags))
 		BUG();
 
@@ -1160,8 +1149,6 @@ restart:
 		return -EIO;
 	}
 
-	set_bit(HIF_PROMOTE, &gh->gh_iflags);
-
 	spin_lock(&gl->gl_spin);
 	add_to_queue(gh);
 	run_queue(gl);
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 089dba4..478023e 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -141,10 +141,6 @@ struct gfs2_glock_operations {
 };
 
 enum {
-	/* Actions */
-	HIF_MUTEX		= 0,
-	HIF_PROMOTE		= 1,
-
 	/* States */
 	HIF_HOLDER		= 6,
 	HIF_FIRST		= 7,
-- 
1.5.1.2

[PATCH 17/58] [GFS2] Given device ID rather than s_id in "id" sysfs file

[swhiteho]

From: Bob Peterson <rpeterso@redhat.com>

This patch changes the /sys/fs/gfs2/<s_id>/id file to give the device
id "major:minor" rather than the s_id.  That enables gfs2_tool to
match devices properly (by id, not name) when locating the tuning files.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/sys.c b/fs/gfs2/sys.c
index 1359198..65dd065 100644
--- a/fs/gfs2/sys.c
+++ b/fs/gfs2/sys.c
@@ -32,7 +32,8 @@ spinlock_t gfs2_sys_margs_lock;
 
 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
 {
-	return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_vfs->s_id);
+	return snprintf(buf, PAGE_SIZE, "%u:%u\n",
+			MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
 }
 
 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
-- 
1.5.1.2

[PATCH 18/58] [GFS2] check kthread_should_stop when waiting

[swhiteho]

From: David Teigland <teigland@redhat.com>

Use wait_event_interruptible() in the lock_dlm thread instead
of an open coded equivalent, and include a kthread_should_stop()
check in the wait test so we don't miss a kthread_stop().

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/locking/dlm/thread.c b/fs/gfs2/locking/dlm/thread.c
index bd938f0..521694f 100644
--- a/fs/gfs2/locking/dlm/thread.c
+++ b/fs/gfs2/locking/dlm/thread.c
@@ -273,18 +273,13 @@ static int gdlm_thread(void *data, int blist)
 	struct gdlm_ls *ls = (struct gdlm_ls *) data;
 	struct gdlm_lock *lp = NULL;
 	uint8_t complete, blocking, submit, drop;
-	DECLARE_WAITQUEUE(wait, current);
 
 	/* Only thread1 is allowed to do blocking callbacks since gfs
 	   may wait for a completion callback within a blocking cb. */
 
 	while (!kthread_should_stop()) {
-		set_current_state(TASK_INTERRUPTIBLE);
-		add_wait_queue(&ls->thread_wait, &wait);
-		if (no_work(ls, blist))
-			schedule();
-		remove_wait_queue(&ls->thread_wait, &wait);
-		set_current_state(TASK_RUNNING);
+		wait_event_interruptible(ls->thread_wait,
+				!no_work(ls, blist) || kthread_should_stop());
 
 		complete = blocking = submit = drop = 0;
 
-- 
1.5.1.2

[PATCH 19/58] [GFS2] Don't add glocks to the journal

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

The only reason for adding glocks to the journal was to keep track
of which locks required a log flush prior to release. We add a
flag to the glock to allow this check to be made in a simpler way.

This reduces the size of a glock (by 12 bytes on i386, 24 on x86_64)
and means that we can avoid extra work during the journal flush.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 5fbd9d3..d83df68 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -346,7 +346,6 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
 	gl->gl_object = NULL;
 	gl->gl_sbd = sdp;
 	gl->gl_aspace = NULL;
-	lops_init_le(&gl->gl_le, &gfs2_glock_lops);
 	INIT_DELAYED_WORK(&gl->gl_work, glock_work_func);
 
 	/* If this glock protects actual on-disk data or metadata blocks,
@@ -1900,8 +1899,6 @@ static int dump_glock(struct glock_iter *gi, struct gfs2_glock *gl)
 	print_dbg(gi, "  req_bh = %s\n", (gl->gl_req_bh) ? "yes" : "no");
 	print_dbg(gi, "  lvb_count = %d\n", atomic_read(&gl->gl_lvb_count));
 	print_dbg(gi, "  object = %s\n", (gl->gl_object) ? "yes" : "no");
-	print_dbg(gi, "  le = %s\n",
-		   (list_empty(&gl->gl_le.le_list)) ? "no" : "yes");
 	print_dbg(gi, "  reclaim = %s\n",
 		   (list_empty(&gl->gl_reclaim)) ? "no" : "yes");
 	if (gl->gl_aspace)
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 478023e..911822d 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -168,6 +168,7 @@ enum {
 	GLF_PENDING_DEMOTE	= 4,
 	GLF_DIRTY		= 5,
 	GLF_DEMOTE_IN_PROGRESS	= 6,
+	GLF_LFLUSH		= 7,
 };
 
 struct gfs2_glock {
@@ -208,7 +209,6 @@ struct gfs2_glock {
 	struct gfs2_sbd *gl_sbd;
 
 	struct inode *gl_aspace;
-	struct gfs2_log_element gl_le;
 	struct list_head gl_ail_list;
 	atomic_t gl_ail_count;
 	struct delayed_work gl_work;
@@ -584,13 +584,11 @@ struct gfs2_sbd {
 	unsigned int sd_log_commited_databuf;
 	unsigned int sd_log_commited_revoke;
 
-	unsigned int sd_log_num_gl;
 	unsigned int sd_log_num_buf;
 	unsigned int sd_log_num_revoke;
 	unsigned int sd_log_num_rg;
 	unsigned int sd_log_num_databuf;
 
-	struct list_head sd_log_le_gl;
 	struct list_head sd_log_le_buf;
 	struct list_head sd_log_le_revoke;
 	struct list_head sd_log_le_rg;
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 532784e..92959d0 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -362,7 +362,8 @@ int gfs2_dinode_dealloc(struct gfs2_inode *ip)
 	if (error)
 		goto out_rg_gunlock;
 
-	gfs2_trans_add_gl(ip->i_gl);
+	set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
+	set_bit(GLF_LFLUSH, &ip->i_gl->gl_flags);
 
 	gfs2_free_di(rgd, ip);
 
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 1e1fe8d..d246843 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -692,20 +692,16 @@ static void gfs2_ordered_wait(struct gfs2_sbd *sdp)
  *
  */
 
-void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
+void __gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
 {
 	struct gfs2_ail *ai;
 
 	down_write(&sdp->sd_log_flush_lock);
 
-	if (gl) {
-		gfs2_log_lock(sdp);
-		if (list_empty(&gl->gl_le.le_list)) {
-			gfs2_log_unlock(sdp);
-			up_write(&sdp->sd_log_flush_lock);
-			return;
-		}
-		gfs2_log_unlock(sdp);
+	/* Log might have been flushed while we waited for the flush lock */
+	if (gl && !test_bit(GLF_LFLUSH, &gl->gl_flags)) {
+		up_write(&sdp->sd_log_flush_lock);
+		return;
 	}
 
 	ai = kzalloc(sizeof(struct gfs2_ail), GFP_NOFS | __GFP_NOFAIL);
@@ -823,7 +819,6 @@ void gfs2_log_shutdown(struct gfs2_sbd *sdp)
 	down_write(&sdp->sd_log_flush_lock);
 
 	gfs2_assert_withdraw(sdp, !sdp->sd_log_blks_reserved);
-	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_gl);
 	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_buf);
 	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_revoke);
 	gfs2_assert_withdraw(sdp, !sdp->sd_log_num_rg);
diff --git a/fs/gfs2/log.h b/fs/gfs2/log.h
index 24e7161..4babd43 100644
--- a/fs/gfs2/log.h
+++ b/fs/gfs2/log.h
@@ -57,7 +57,14 @@ void gfs2_log_incr_head(struct gfs2_sbd *sdp);
 struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp);
 struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
 				      struct buffer_head *real);
-void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl);
+void __gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl);
+
+static inline void gfs2_log_flush(struct gfs2_sbd *sbd, struct gfs2_glock *gl)
+{
+	if (!gl || test_bit(GLF_LFLUSH, &gl->gl_flags))
+		__gfs2_log_flush(sbd, gl);
+}
+
 void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *trans);
 void gfs2_remove_from_ail(struct gfs2_bufdata *bd);
 
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index e901f8f..fae59d6 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -87,6 +87,7 @@ static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
 	}
 	bd->bd_ail = ai;
 	list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list);
+	clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 	gfs2_log_unlock(sdp);
 	unlock_buffer(bh);
 }
@@ -124,49 +125,6 @@ static struct buffer_head *gfs2_get_log_desc(struct gfs2_sbd *sdp, u32 ld_type)
 	return bh;
 }
 
-static void __glock_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
-{
-	struct gfs2_glock *gl;
-	struct gfs2_trans *tr = current->journal_info;
-
-	tr->tr_touched = 1;
-
-	gl = container_of(le, struct gfs2_glock, gl_le);
-	if (gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(gl)))
-		return;
-
-	if (!list_empty(&le->le_list))
-		return;
-
-	gfs2_glock_hold(gl);
-	set_bit(GLF_DIRTY, &gl->gl_flags);
-	sdp->sd_log_num_gl++;
-	list_add(&le->le_list, &sdp->sd_log_le_gl);
-}
-
-static void glock_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
-{
-	gfs2_log_lock(sdp);
-	__glock_lo_add(sdp, le);
-	gfs2_log_unlock(sdp);
-}
-
-static void glock_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
-{
-	struct list_head *head = &sdp->sd_log_le_gl;
-	struct gfs2_glock *gl;
-
-	while (!list_empty(head)) {
-		gl = list_entry(head->next, struct gfs2_glock, gl_le.le_list);
-		list_del_init(&gl->gl_le.le_list);
-		sdp->sd_log_num_gl--;
-
-		gfs2_assert_withdraw(sdp, gfs2_glock_is_held_excl(gl));
-		gfs2_glock_put(gl);
-	}
-	gfs2_assert_warn(sdp, !sdp->sd_log_num_gl);
-}
-
 static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 {
 	struct gfs2_bufdata *bd = container_of(le, struct gfs2_bufdata, bd_le);
@@ -182,7 +140,8 @@ static void buf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 	list_add(&bd->bd_list_tr, &tr->tr_list_buf);
 	if (!list_empty(&le->le_list))
 		goto out;
-	__glock_lo_add(sdp, &bd->bd_gl->gl_le);
+	set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
+	set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 	gfs2_meta_check(sdp, bd->bd_bh);
 	gfs2_pin(sdp, bd->bd_bh);
 	sdp->sd_log_num_buf++;
@@ -568,8 +527,8 @@ static void databuf_lo_add(struct gfs2_sbd *sdp, struct gfs2_log_element *le)
 	if (!list_empty(&le->le_list))
 		goto out;
 
-	if (tr)
-		__glock_lo_add(sdp, &bd->bd_gl->gl_le);
+	set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
+	set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 	if (gfs2_is_jdata(ip)) {
 		gfs2_pin(sdp, bd->bd_bh);
 		tr->tr_num_databuf_new++;
@@ -776,12 +735,6 @@ static void databuf_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 }
 
 
-const struct gfs2_log_operations gfs2_glock_lops = {
-	.lo_add = glock_lo_add,
-	.lo_after_commit = glock_lo_after_commit,
-	.lo_name = "glock",
-};
-
 const struct gfs2_log_operations gfs2_buf_lops = {
 	.lo_add = buf_lo_add,
 	.lo_incore_commit = buf_lo_incore_commit,
@@ -819,7 +772,6 @@ const struct gfs2_log_operations gfs2_databuf_lops = {
 };
 
 const struct gfs2_log_operations *gfs2_log_ops[] = {
-	&gfs2_glock_lops,
 	&gfs2_databuf_lops,
 	&gfs2_buf_lops,
 	&gfs2_rg_lops,
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 17de58e..52aaba9 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -77,7 +77,6 @@ static struct gfs2_sbd *init_sbd(struct super_block *sb)
 
 	spin_lock_init(&sdp->sd_log_lock);
 
-	INIT_LIST_HEAD(&sdp->sd_log_le_gl);
 	INIT_LIST_HEAD(&sdp->sd_log_le_buf);
 	INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
 	INIT_LIST_HEAD(&sdp->sd_log_le_rg);
diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c
index 717983e..73e5d92 100644
--- a/fs/gfs2/trans.c
+++ b/fs/gfs2/trans.c
@@ -114,11 +114,6 @@ void gfs2_trans_end(struct gfs2_sbd *sdp)
 		gfs2_log_flush(sdp, NULL);
 }
 
-void gfs2_trans_add_gl(struct gfs2_glock *gl)
-{
-	lops_add(gl->gl_sbd, &gl->gl_le);
-}
-
 /**
  * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
  * @gl: the glock the buffer belongs to
diff --git a/fs/gfs2/trans.h b/fs/gfs2/trans.h
index 043d5f4..e826f0d 100644
--- a/fs/gfs2/trans.h
+++ b/fs/gfs2/trans.h
@@ -30,7 +30,6 @@ int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
 
 void gfs2_trans_end(struct gfs2_sbd *sdp);
 
-void gfs2_trans_add_gl(struct gfs2_glock *gl);
 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta);
 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd);
 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno);
-- 
1.5.1.2

[PATCH 20/58] [GFS2] Use atomic_t for journal free blocks counter

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

This patch changes the counter which keeps track of the free
blocks in the journal to an atomic_t in preparation for the
following patch which will update the log reservation code.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 911822d..7ae0206 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -595,7 +595,7 @@ struct gfs2_sbd {
 	struct list_head sd_log_le_databuf;
 	struct list_head sd_log_le_ordered;
 
-	unsigned int sd_log_blks_free;
+	atomic_t sd_log_blks_free;
 	struct mutex sd_log_reserve_mutex;
 
 	u64 sd_log_sequence;
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index d246843..9192398 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -301,7 +301,7 @@ int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
 
 	mutex_lock(&sdp->sd_log_reserve_mutex);
 	gfs2_log_lock(sdp);
-	while(sdp->sd_log_blks_free <= (blks + reserved_blks)) {
+	while(atomic_read(&sdp->sd_log_blks_free) <= (blks + reserved_blks)) {
 		gfs2_log_unlock(sdp);
 		gfs2_ail1_empty(sdp, 0);
 		gfs2_log_flush(sdp, NULL);
@@ -310,7 +310,7 @@ int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
 			gfs2_ail1_start(sdp, 0);
 		gfs2_log_lock(sdp);
 	}
-	sdp->sd_log_blks_free -= blks;
+	atomic_sub(blks, &sdp->sd_log_blks_free);
 	gfs2_log_unlock(sdp);
 	mutex_unlock(&sdp->sd_log_reserve_mutex);
 
@@ -330,9 +330,9 @@ void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
 {
 
 	gfs2_log_lock(sdp);
-	sdp->sd_log_blks_free += blks;
+	atomic_add(blks, &sdp->sd_log_blks_free);
 	gfs2_assert_withdraw(sdp,
-			     sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks);
+			     atomic_read(&sdp->sd_log_blks_free) <= sdp->sd_jdesc->jd_blocks);
 	gfs2_log_unlock(sdp);
 	up_read(&sdp->sd_log_flush_lock);
 }
@@ -559,8 +559,8 @@ static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail)
 	ail2_empty(sdp, new_tail);
 
 	gfs2_log_lock(sdp);
-	sdp->sd_log_blks_free += dist;
-	gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <= sdp->sd_jdesc->jd_blocks);
+	atomic_add(dist, &sdp->sd_log_blks_free);
+	gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <= sdp->sd_jdesc->jd_blocks);
 	gfs2_log_unlock(sdp);
 
 	sdp->sd_log_tail = new_tail;
@@ -733,7 +733,7 @@ void __gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
 		log_flush_commit(sdp);
 	else if (sdp->sd_log_tail != current_tail(sdp) && !sdp->sd_log_idle){
 		gfs2_log_lock(sdp);
-		sdp->sd_log_blks_free--; /* Adjust for unreserved buffer */
+		atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */
 		gfs2_log_unlock(sdp);
 		log_write_header(sdp, 0, PULL);
 	}
@@ -773,12 +773,12 @@ static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 	sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
 	gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0);
 	reserved = calc_reserved(sdp);
-	old = sdp->sd_log_blks_free;
-	sdp->sd_log_blks_free += tr->tr_reserved -
-				 (reserved - sdp->sd_log_blks_reserved);
+	old = atomic_read(&sdp->sd_log_blks_free);
+	atomic_add(tr->tr_reserved - (reserved - sdp->sd_log_blks_reserved),
+		   &sdp->sd_log_blks_free);
 
-	gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free >= old);
-	gfs2_assert_withdraw(sdp, sdp->sd_log_blks_free <=
+	gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) >= old);
+	gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
 			     sdp->sd_jdesc->jd_blocks);
 
 	sdp->sd_log_blks_reserved = reserved;
@@ -831,7 +831,7 @@ void gfs2_log_shutdown(struct gfs2_sbd *sdp)
 	log_write_header(sdp, GFS2_LOG_HEAD_UNMOUNT,
 			 (sdp->sd_log_tail == current_tail(sdp)) ? 0 : PULL);
 
-	gfs2_assert_warn(sdp, sdp->sd_log_blks_free == sdp->sd_jdesc->jd_blocks);
+	gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
 	gfs2_assert_warn(sdp, sdp->sd_log_head == sdp->sd_log_tail);
 	gfs2_assert_warn(sdp, list_empty(&sdp->sd_ail2_list));
 
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 52aaba9..1bba6ac 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -339,7 +339,7 @@ static int init_journal(struct gfs2_sbd *sdp, int undo)
 
 	if (sdp->sd_args.ar_spectator) {
 		sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
-		sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
+		atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 	} else {
 		if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 			fs_err(sdp, "can't mount journal #%u\n",
@@ -376,7 +376,7 @@ static int init_journal(struct gfs2_sbd *sdp, int undo)
 			       sdp->sd_jdesc->jd_jid, error);
 			goto fail_jinode_gh;
 		}
-		sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
+		atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 	}
 
 	if (sdp->sd_lockstruct.ls_first) {
-- 
1.5.1.2

[PATCH 21/58] [GFS2] Move gfs2_logd into log.c

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

This means that we can mark gfs2_ail1_empty static and prepares
the way for further changes.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/daemon.c b/fs/gfs2/daemon.c
index 3731ab0..e519919 100644
--- a/fs/gfs2/daemon.c
+++ b/fs/gfs2/daemon.c
@@ -83,56 +83,6 @@ int gfs2_recoverd(void *data)
 }
 
 /**
- * gfs2_logd - Update log tail as Active Items get flushed to in-place blocks
- * @sdp: Pointer to GFS2 superblock
- *
- * Also, periodically check to make sure that we're using the most recent
- * journal index.
- */
-
-int gfs2_logd(void *data)
-{
-	struct gfs2_sbd *sdp = data;
-	struct gfs2_holder ji_gh;
-	unsigned long t;
-	int need_flush;
-
-	while (!kthread_should_stop()) {
-		/* Advance the log tail */
-
-		t = sdp->sd_log_flush_time +
-		    gfs2_tune_get(sdp, gt_log_flush_secs) * HZ;
-
-		gfs2_ail1_empty(sdp, DIO_ALL);
-		gfs2_log_lock(sdp);
-		need_flush = sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks);
-		gfs2_log_unlock(sdp);
-		if (need_flush || time_after_eq(jiffies, t)) {
-			gfs2_log_flush(sdp, NULL);
-			sdp->sd_log_flush_time = jiffies;
-		}
-
-		/* Check for latest journal index */
-
-		t = sdp->sd_jindex_refresh_time +
-		    gfs2_tune_get(sdp, gt_jindex_refresh_secs) * HZ;
-
-		if (time_after_eq(jiffies, t)) {
-			if (!gfs2_jindex_hold(sdp, &ji_gh))
-				gfs2_glock_dq_uninit(&ji_gh);
-			sdp->sd_jindex_refresh_time = jiffies;
-		}
-
-		t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
-		if (freezing(current))
-			refrigerator();
-		schedule_timeout_interruptible(t);
-	}
-
-	return 0;
-}
-
-/**
  * gfs2_quotad - Write cached quota changes into the quota file
  * @sdp: Pointer to GFS2 superblock
  *
diff --git a/fs/gfs2/daemon.h b/fs/gfs2/daemon.h
index 0de9b35..4be084f 100644
--- a/fs/gfs2/daemon.h
+++ b/fs/gfs2/daemon.h
@@ -12,7 +12,6 @@
 
 int gfs2_glockd(void *data);
 int gfs2_recoverd(void *data);
-int gfs2_logd(void *data);
 int gfs2_quotad(void *data);
 
 #endif /* __DAEMON_DOT_H__ */
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 9192398..e88a684 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -16,6 +16,8 @@
 #include <linux/crc32.h>
 #include <linux/lm_interface.h>
 #include <linux/delay.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
 
 #include "gfs2.h"
 #include "incore.h"
@@ -26,6 +28,7 @@
 #include "meta_io.h"
 #include "util.h"
 #include "dir.h"
+#include "super.h"
 
 #define PULL 1
 
@@ -208,7 +211,7 @@ static void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags)
 	gfs2_log_unlock(sdp);
 }
 
-int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags)
+static int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags)
 {
 	struct gfs2_ail *ai, *s;
 	int ret;
@@ -859,3 +862,54 @@ void gfs2_meta_syncfs(struct gfs2_sbd *sdp)
 	}
 }
 
+
+/**
+ * gfs2_logd - Update log tail as Active Items get flushed to in-place blocks
+ * @sdp: Pointer to GFS2 superblock
+ *
+ * Also, periodically check to make sure that we're using the most recent
+ * journal index.
+ */
+
+int gfs2_logd(void *data)
+{
+	struct gfs2_sbd *sdp = data;
+	struct gfs2_holder ji_gh;
+	unsigned long t;
+	int need_flush;
+
+	while (!kthread_should_stop()) {
+		/* Advance the log tail */
+
+		t = sdp->sd_log_flush_time +
+		    gfs2_tune_get(sdp, gt_log_flush_secs) * HZ;
+
+		gfs2_ail1_empty(sdp, DIO_ALL);
+		gfs2_log_lock(sdp);
+		need_flush = sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks);
+		gfs2_log_unlock(sdp);
+		if (need_flush || time_after_eq(jiffies, t)) {
+			gfs2_log_flush(sdp, NULL);
+			sdp->sd_log_flush_time = jiffies;
+		}
+
+		/* Check for latest journal index */
+
+		t = sdp->sd_jindex_refresh_time +
+		    gfs2_tune_get(sdp, gt_jindex_refresh_secs) * HZ;
+
+		if (time_after_eq(jiffies, t)) {
+			if (!gfs2_jindex_hold(sdp, &ji_gh))
+				gfs2_glock_dq_uninit(&ji_gh);
+			sdp->sd_jindex_refresh_time = jiffies;
+		}
+
+		t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
+		if (freezing(current))
+			refrigerator();
+		schedule_timeout_interruptible(t);
+	}
+
+	return 0;
+}
+
diff --git a/fs/gfs2/log.h b/fs/gfs2/log.h
index 4babd43..7711528 100644
--- a/fs/gfs2/log.h
+++ b/fs/gfs2/log.h
@@ -48,8 +48,6 @@ static inline void gfs2_log_pointers_init(struct gfs2_sbd *sdp,
 unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
 			    unsigned int ssize);
 
-int gfs2_ail1_empty(struct gfs2_sbd *sdp, int flags);
-
 int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks);
 void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks);
 void gfs2_log_incr_head(struct gfs2_sbd *sdp);
@@ -70,5 +68,6 @@ void gfs2_remove_from_ail(struct gfs2_bufdata *bd);
 
 void gfs2_log_shutdown(struct gfs2_sbd *sdp);
 void gfs2_meta_syncfs(struct gfs2_sbd *sdp);
+int gfs2_logd(void *data);
 
 #endif /* __LOG_DOT_H__ */
-- 
1.5.1.2

[PATCH 22/58] [GFS2] Don't periodically update the jindex

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

We only care about the content of the jindex in two cases,
one is when we mount the fs and the other is when we need
to recover another journal. In both cases we have to update
the jindex anyway, so there is no point in updating it
periodically between times, so this removes it to simplify
gfs2_logd.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 7ae0206..330f4c7 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -411,7 +411,6 @@ struct gfs2_tune {
 	unsigned int gt_demote_secs; /* Cache retention for unheld glock */
 	unsigned int gt_incore_log_blocks;
 	unsigned int gt_log_flush_secs;
-	unsigned int gt_jindex_refresh_secs; /* Check for new journal index */
 
 	unsigned int gt_recoverd_secs;
 	unsigned int gt_logd_secs;
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index e88a684..4dcc7a8 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -28,7 +28,6 @@
 #include "meta_io.h"
 #include "util.h"
 #include "dir.h"
-#include "super.h"
 
 #define PULL 1
 
@@ -874,7 +873,6 @@ void gfs2_meta_syncfs(struct gfs2_sbd *sdp)
 int gfs2_logd(void *data)
 {
 	struct gfs2_sbd *sdp = data;
-	struct gfs2_holder ji_gh;
 	unsigned long t;
 	int need_flush;
 
@@ -893,17 +891,6 @@ int gfs2_logd(void *data)
 			sdp->sd_log_flush_time = jiffies;
 		}
 
-		/* Check for latest journal index */
-
-		t = sdp->sd_jindex_refresh_time +
-		    gfs2_tune_get(sdp, gt_jindex_refresh_secs) * HZ;
-
-		if (time_after_eq(jiffies, t)) {
-			if (!gfs2_jindex_hold(sdp, &ji_gh))
-				gfs2_glock_dq_uninit(&ji_gh);
-			sdp->sd_jindex_refresh_time = jiffies;
-		}
-
 		t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
 		if (freezing(current))
 			refrigerator();
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 548cc8b..2e74792 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -54,7 +54,6 @@ void gfs2_tune_init(struct gfs2_tune *gt)
 	gt->gt_demote_secs = 300;
 	gt->gt_incore_log_blocks = 1024;
 	gt->gt_log_flush_secs = 60;
-	gt->gt_jindex_refresh_secs = 60;
 	gt->gt_recoverd_secs = 60;
 	gt->gt_logd_secs = 1;
 	gt->gt_quotad_secs = 5;
diff --git a/fs/gfs2/sys.c b/fs/gfs2/sys.c
index 65dd065..7f828a2 100644
--- a/fs/gfs2/sys.c
+++ b/fs/gfs2/sys.c
@@ -428,7 +428,6 @@ TUNE_ATTR_2(name, name##_store)
 TUNE_ATTR(demote_secs, 0);
 TUNE_ATTR(incore_log_blocks, 0);
 TUNE_ATTR(log_flush_secs, 0);
-TUNE_ATTR(jindex_refresh_secs, 0);
 TUNE_ATTR(quota_warn_period, 0);
 TUNE_ATTR(quota_quantum, 0);
 TUNE_ATTR(atime_quantum, 0);
@@ -450,7 +449,6 @@ static struct attribute *tune_attrs[] = {
 	&tune_attr_demote_secs.attr,
 	&tune_attr_incore_log_blocks.attr,
 	&tune_attr_log_flush_secs.attr,
-	&tune_attr_jindex_refresh_secs.attr,
 	&tune_attr_quota_warn_period.attr,
 	&tune_attr_quota_quantum.attr,
 	&tune_attr_atime_quantum.attr,
-- 
1.5.1.2

[PATCH 23/58] [GFS2] Check for installation of mount helpers for DLM mounts

[swhiteho]

From: Fabio Massimo Di Nitto <fabbione@ubuntu.com>

The patch is a fix to abort mount if the mount.gfs* and possible
umount.* are missing from /sbin.

While we do what we can to guarantee that they are installed properly in
userland (CVS HEAD), we want to make sure that mount still aborts properly.

The only sign of missing helpers is that lock_dlm will receive no mount options
at all. According to David the problem does not exist for lock_nolock as the
helpers are not required.

The patch has been tested for both gfs and gfs2 and it works as expected. The
lack of mount.gfs* will generate an error that is propagated to mount:

oot@node1:~# mount -t  gfs2 /dev/nbd2 /mnt/
mount: wrong fs type, bad option, bad superblock on /dev/nbd2,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

[ 3513.303346] GFS2: fsid=: Trying to join cluster "lock_dlm", "gutsy:gfs2"
[ 3513.304546] DLM/GFS2/GFS ERROR: (u)mount helpers are not installed properly!
[ 3513.306290] GFS2: fsid=: can't mount proto=lock_dlm, table=gutsy:gfs2, hostdata=

You might want to notice that it will also avoid mount to hang or fail silently
or with strange errors that will require the cluster to reboot/restart before
you can actually mount the filesystem again.

Signed-off-by: Fabio M. Di Nitto <fabbione@ubuntu.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/locking/dlm/mount.c b/fs/gfs2/locking/dlm/mount.c
index 41c5b04..ab30102 100644
--- a/fs/gfs2/locking/dlm/mount.c
+++ b/fs/gfs2/locking/dlm/mount.c
@@ -67,6 +67,12 @@ static int make_args(struct gdlm_ls *ls, char *data_arg, int *nodir)
 	memset(data, 0, 256);
 	strncpy(data, data_arg, 255);
 
+	if (!strlen(data)) {
+		printk(KERN_ERR
+		       "DLM/GFS2/GFS ERROR: (u)mount helpers are not installed!\n");
+		return -EINVAL;
+	}
+
 	for (options = data; (x = strsep(&options, ":")); ) {
 		if (!*x)
 			continue;
-- 
1.5.1.2

[PATCH 24/58] [GFS2] tidy up error message

[swhiteho]

From: David Teigland <teigland@redhat.com>

Print error with log_error() to be consistent with others.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Fabio M. Di Nitto <fabbione@ubuntu.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/locking/dlm/mount.c b/fs/gfs2/locking/dlm/mount.c
index ab30102..f2efff4 100644
--- a/fs/gfs2/locking/dlm/mount.c
+++ b/fs/gfs2/locking/dlm/mount.c
@@ -68,8 +68,7 @@ static int make_args(struct gdlm_ls *ls, char *data_arg, int *nodir)
 	strncpy(data, data_arg, 255);
 
 	if (!strlen(data)) {
-		printk(KERN_ERR
-		       "DLM/GFS2/GFS ERROR: (u)mount helpers are not installed!\n");
+		log_error("no mount options, (u)mount helpers not installed");
 		return -EINVAL;
 	}
 
-- 
1.5.1.2

[PATCH 25/58] [GFS2] Fix runtime issue with UP kernels

[swhiteho]

From: Fabio Massimo Di Nitto <fabbione@ubuntu.com>

The issue is indeed UP vs SMP and it is totally random.

spin_is_locked() is a bad assertion because there is no correct answer on UP.
on UP spin_is_locked() has to return either one value or another, always.

This means that in my setup I am lucky enough to trigger the issue and your you
are lucky enough not to.

the patch in attachment removes the bogus calls to BUG_ON and according to David
(in CC and thanks for the long explanation on the problem) we can rely upon
things like lockdep to find problem that might be trying to catch.

Signed-off-by: Fabio M. Di Nitto <fabbione@ubuntu.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index d83df68..a7f3c46 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -217,7 +217,6 @@ int gfs2_glock_put(struct gfs2_glock *gl)
 	if (atomic_dec_and_test(&gl->gl_ref)) {
 		hlist_del(&gl->gl_list);
 		write_unlock(gl_lock_addr(gl->gl_hash));
-		BUG_ON(spin_is_locked(&gl->gl_spin));
 		gfs2_assert(sdp, gl->gl_state == LM_ST_UNLOCKED);
 		gfs2_assert(sdp, list_empty(&gl->gl_reclaim));
 		gfs2_assert(sdp, list_empty(&gl->gl_holders));
@@ -460,7 +459,6 @@ static void wait_on_holder(struct gfs2_holder *gh)
 
 static void gfs2_demote_wake(struct gfs2_glock *gl)
 {
-	BUG_ON(!spin_is_locked(&gl->gl_spin));
 	gl->gl_demote_state = LM_ST_EXCLUSIVE;
         clear_bit(GLF_DEMOTE, &gl->gl_flags);
         smp_mb__after_clear_bit();
@@ -680,7 +678,6 @@ static void gfs2_glmutex_unlock(struct gfs2_glock *gl)
 	gl->gl_owner_pid = 0;
 	gl->gl_ip = 0;
 	run_queue(gl);
-	BUG_ON(!spin_is_locked(&gl->gl_spin));
 	spin_unlock(&gl->gl_spin);
 }
 
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 4dcc7a8..96dcf05 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -92,8 +92,6 @@ static void gfs2_ail1_start_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
 	struct buffer_head *bh;
 	int retry;
 
-	BUG_ON(!spin_is_locked(&sdp->sd_log_lock));
-
 	do {
 		retry = 0;
 
-- 
1.5.1.2

[PATCH 26/58] [GFS2] Revise gfs2_logd and flush thresholds

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

This patch intriduces two new log thresholds:

 o thresh1 is the point at which we wake up gfs2_logd due to the pinned
   block count. It is initialised at mount time to 2/5ths of the size
   of the journal. Currently it does not change during the course of
   the mount, but the intention is to adjust it automatically based
   upon various conditions. This automatic adjustment will be the subject
   of later patches.

 o thresh2 is the point at which we wake up gfs2_logd due to the total
   of pinned blocks and AIL blocks. It is initialised at mount time
   to 4/5ths of the size of the journal. The reason for not making it
   equal to 100% of journal size is to give gfs2_logd time to start up
   and do something before the processes filling the journal before
   they land up stalling, and waiting on journal flushes.

At the same time, the incore_log_blocks tunable is removed since it
was wrong (just a basic fixed threshold set to a number plucked out
of the air) and it was being compared against the wrong thing (the
amount of metadata in the journal) rather than the total number of
blocks.

Also, since the free blocks count is now an atomic variable, a
number of these comparisons now do not need locking, so that
the log lock has been removed around some operations.

This patch also ensures that there are no races when gfs2_logd is
woken up. It also changes the behavour of the periodic sync
so that instead of occuring every 60 secs, they will now
occur every 30 secs (which can be set via /sysfs still) if
there have been no other log flushes in the mean time.

When we reserve blocks at the start of a transaction, we now
use a waitqueue too. This means we can remove the old mutex
and the fast path through that code is just a couple of atomic
operations now. Also we no longer do log flushing at this point
in the code. Instead we wake up gfs2_logd to do it for us (this
shouldn't happen if the log is large enough and if gfs2_logd is
properly tuned) and do an exclusive wait.

As a result of these changes, postmark on my test machine runs about
20% faster, mainly due to increased efficiency in flushing the
journal.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 330f4c7..743ebba 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -409,8 +409,6 @@ struct gfs2_tune {
 	spinlock_t gt_spin;
 
 	unsigned int gt_demote_secs; /* Cache retention for unheld glock */
-	unsigned int gt_incore_log_blocks;
-	unsigned int gt_log_flush_secs;
 
 	unsigned int gt_recoverd_secs;
 	unsigned int gt_logd_secs;
@@ -542,7 +540,6 @@ struct gfs2_sbd {
 	spinlock_t sd_jindex_spin;
 	struct mutex sd_jindex_mutex;
 	unsigned int sd_journals;
-	unsigned long sd_jindex_refresh_time;
 
 	struct gfs2_jdesc *sd_jdesc;
 	struct gfs2_holder sd_journal_gh;
@@ -583,6 +580,7 @@ struct gfs2_sbd {
 	unsigned int sd_log_commited_databuf;
 	unsigned int sd_log_commited_revoke;
 
+	atomic_t sd_log_pinned;
 	unsigned int sd_log_num_buf;
 	unsigned int sd_log_num_revoke;
 	unsigned int sd_log_num_rg;
@@ -594,15 +592,17 @@ struct gfs2_sbd {
 	struct list_head sd_log_le_databuf;
 	struct list_head sd_log_le_ordered;
 
+	atomic_t sd_log_thresh1;
+	atomic_t sd_log_thresh2;
 	atomic_t sd_log_blks_free;
-	struct mutex sd_log_reserve_mutex;
+	wait_queue_head_t sd_log_waitq;
+	wait_queue_head_t sd_logd_waitq;
 
 	u64 sd_log_sequence;
 	unsigned int sd_log_head;
 	unsigned int sd_log_tail;
 	int sd_log_idle;
 
-	unsigned long sd_log_flush_time;
 	struct rw_semaphore sd_log_flush_lock;
 	atomic_t sd_log_in_flight;
 	wait_queue_head_t sd_log_flush_wait;
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 96dcf05..143311c 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -165,7 +165,7 @@ static int gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai, int fl
 	return list_empty(&ai->ai_ail1_list);
 }
 
-static void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags)
+static void gfs2_ail1_start(struct gfs2_sbd *sdp)
 {
 	struct list_head *head;
 	u64 sync_gen;
@@ -186,14 +186,7 @@ static void gfs2_ail1_start(struct gfs2_sbd *sdp, int flags)
 	first_ai->ai_sync_gen = sync_gen;
 	gfs2_ail1_start_one(sdp, first_ai); /* This may drop log lock */
 
-	if (flags & DIO_ALL)
-		first = NULL;
-
 	while(!done) {
-		if (first && (head->prev != first ||
-			      gfs2_ail1_empty_one(sdp, first_ai, 0)))
-			break;
-
 		done = 1;
 		list_for_each_entry_safe_reverse(ai, tmp, head, ai_list) {
 			if (ai->ai_sync_gen >= sync_gen)
@@ -287,56 +280,56 @@ static void ail2_empty(struct gfs2_sbd *sdp, unsigned int new_tail)
  * flush time, so we ensure that we have just enough free blocks at all
  * times to avoid running out during a log flush.
  *
+ * We no longer flush the log here, instead we wake up logd to do that
+ * for us. To avoid the thundering herd and to ensure that we deal fairly
+ * with queued waiters, we use an exclusive wait. This means that when we
+ * get woken with enough journal space to get our reservation, we need to
+ * wake the next waiter on the list.
+ *
  * Returns: errno
  */
 
 int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks)
 {
-	unsigned int try = 0;
 	unsigned reserved_blks = 6 * (4096 / sdp->sd_vfs->s_blocksize);
+	unsigned wanted = blks + reserved_blks;
+	DEFINE_WAIT(wait);
+	int did_wait = 0;
+	unsigned int free_blocks;
 
 	if (gfs2_assert_warn(sdp, blks) ||
 	    gfs2_assert_warn(sdp, blks <= sdp->sd_jdesc->jd_blocks))
 		return -EINVAL;
-
-	mutex_lock(&sdp->sd_log_reserve_mutex);
-	gfs2_log_lock(sdp);
-	while(atomic_read(&sdp->sd_log_blks_free) <= (blks + reserved_blks)) {
-		gfs2_log_unlock(sdp);
-		gfs2_ail1_empty(sdp, 0);
-		gfs2_log_flush(sdp, NULL);
-
-		if (try++)
-			gfs2_ail1_start(sdp, 0);
-		gfs2_log_lock(sdp);
+retry:
+	free_blocks = atomic_read(&sdp->sd_log_blks_free);
+	if (unlikely(free_blocks <= wanted)) {
+		wake_up(&sdp->sd_logd_waitq);
+		do {
+			prepare_to_wait_exclusive(&sdp->sd_log_waitq, &wait,
+						  TASK_UNINTERRUPTIBLE);
+			did_wait = 1;
+			if (atomic_read(&sdp->sd_log_blks_free) <= wanted)
+				io_schedule();
+			free_blocks = atomic_read(&sdp->sd_log_blks_free);
+		} while(free_blocks <= wanted);
+		finish_wait(&sdp->sd_log_waitq, &wait);
 	}
-	atomic_sub(blks, &sdp->sd_log_blks_free);
-	gfs2_log_unlock(sdp);
-	mutex_unlock(&sdp->sd_log_reserve_mutex);
+	if (atomic_cmpxchg(&sdp->sd_log_blks_free, free_blocks,
+			   free_blocks - blks) != free_blocks)
+		goto retry;
+
+	/* 
+	 * If we waited, then so might others, wake them up _after_ we get
+	 * our share of the log.
+	 */
+	if (unlikely(did_wait))
+		wake_up(&sdp->sd_log_waitq);
 
 	down_read(&sdp->sd_log_flush_lock);
 
 	return 0;
 }
 
-/**
- * gfs2_log_release - Release a given number of log blocks
- * @sdp: The GFS2 superblock
- * @blks: The number of blocks
- *
- */
-
-void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
-{
-
-	gfs2_log_lock(sdp);
-	atomic_add(blks, &sdp->sd_log_blks_free);
-	gfs2_assert_withdraw(sdp,
-			     atomic_read(&sdp->sd_log_blks_free) <= sdp->sd_jdesc->jd_blocks);
-	gfs2_log_unlock(sdp);
-	up_read(&sdp->sd_log_flush_lock);
-}
-
 static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn)
 {
 	struct inode *inode = sdp->sd_jdesc->jd_inode;
@@ -558,10 +551,9 @@ static void log_pull_tail(struct gfs2_sbd *sdp, unsigned int new_tail)
 
 	ail2_empty(sdp, new_tail);
 
-	gfs2_log_lock(sdp);
 	atomic_add(dist, &sdp->sd_log_blks_free);
-	gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <= sdp->sd_jdesc->jd_blocks);
-	gfs2_log_unlock(sdp);
+	gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
+				  sdp->sd_jdesc->jd_blocks);
 
 	sdp->sd_log_tail = new_tail;
 }
@@ -791,6 +783,13 @@ static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
  * @sdp: the filesystem
  * @tr: the transaction
  *
+ * We wake up gfs2_logd if the number of pinned blocks exceed thresh1
+ * or the total number of used blocks (pinned blocks plus AIL blocks)
+ * is greater than thresh2.
+ *
+ * At mount time thresh1 is 1/3rd of journal size, thresh2 is 2/3rd of
+ * journal size.
+ *
  * Returns: errno
  */
 
@@ -802,10 +801,10 @@ void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 	sdp->sd_vfs->s_dirt = 1;
 	up_read(&sdp->sd_log_flush_lock);
 
-	gfs2_log_lock(sdp);
-	if (sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks))
-		wake_up_process(sdp->sd_logd_process);
-	gfs2_log_unlock(sdp);
+	if (atomic_read(&sdp->sd_log_pinned) > atomic_read(&sdp->sd_log_thresh1) ||
+	    ((sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free)) <
+	    atomic_read(&sdp->sd_log_thresh2)))
+		wake_up(&sdp->sd_logd_waitq);
 }
 
 /**
@@ -852,13 +851,23 @@ void gfs2_meta_syncfs(struct gfs2_sbd *sdp)
 {
 	gfs2_log_flush(sdp, NULL);
 	for (;;) {
-		gfs2_ail1_start(sdp, DIO_ALL);
+		gfs2_ail1_start(sdp);
 		if (gfs2_ail1_empty(sdp, DIO_ALL))
 			break;
 		msleep(10);
 	}
 }
 
+static inline int gfs2_jrnl_flush_reqd(struct gfs2_sbd *sdp)
+{
+	return (atomic_read(&sdp->sd_log_pinned) >= atomic_read(&sdp->sd_log_thresh1));
+}
+
+static inline int gfs2_ail_flush_reqd(struct gfs2_sbd *sdp)
+{
+	unsigned int used_blocks = sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free);
+	return used_blocks >= atomic_read(&sdp->sd_log_thresh2);
+}
 
 /**
  * gfs2_logd - Update log tail as Active Items get flushed to in-place blocks
@@ -871,28 +880,43 @@ void gfs2_meta_syncfs(struct gfs2_sbd *sdp)
 int gfs2_logd(void *data)
 {
 	struct gfs2_sbd *sdp = data;
-	unsigned long t;
-	int need_flush;
+	unsigned long t = 1;
+	DEFINE_WAIT(wait);
+	unsigned preflush;
 
 	while (!kthread_should_stop()) {
-		/* Advance the log tail */
 
-		t = sdp->sd_log_flush_time +
-		    gfs2_tune_get(sdp, gt_log_flush_secs) * HZ;
+		preflush = atomic_read(&sdp->sd_log_pinned);
+		if (gfs2_jrnl_flush_reqd(sdp) || t == 0) {
+			gfs2_ail1_empty(sdp, DIO_ALL);
+			gfs2_log_flush(sdp, NULL);
+			gfs2_ail1_empty(sdp, DIO_ALL);
+		}
 
-		gfs2_ail1_empty(sdp, DIO_ALL);
-		gfs2_log_lock(sdp);
-		need_flush = sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks);
-		gfs2_log_unlock(sdp);
-		if (need_flush || time_after_eq(jiffies, t)) {
+		if (gfs2_ail_flush_reqd(sdp)) {
+			gfs2_ail1_start(sdp);
+			io_schedule();
+			gfs2_ail1_empty(sdp, 0);
 			gfs2_log_flush(sdp, NULL);
-			sdp->sd_log_flush_time = jiffies;
+			gfs2_ail1_empty(sdp, DIO_ALL);
 		}
 
+		wake_up(&sdp->sd_log_waitq);
 		t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
 		if (freezing(current))
 			refrigerator();
-		schedule_timeout_interruptible(t);
+
+		do {
+			prepare_to_wait(&sdp->sd_logd_waitq, &wait,
+					TASK_UNINTERRUPTIBLE);
+			if (!gfs2_ail_flush_reqd(sdp) &&
+			    !gfs2_jrnl_flush_reqd(sdp) &&
+			    !kthread_should_stop())
+				t = schedule_timeout(t);
+		} while(t && !gfs2_ail_flush_reqd(sdp) &&
+			!gfs2_jrnl_flush_reqd(sdp) &&
+			!kthread_should_stop());
+		finish_wait(&sdp->sd_logd_waitq, &wait);
 	}
 
 	return 0;
diff --git a/fs/gfs2/log.h b/fs/gfs2/log.h
index 7711528..bc91125 100644
--- a/fs/gfs2/log.h
+++ b/fs/gfs2/log.h
@@ -49,7 +49,6 @@ unsigned int gfs2_struct2blk(struct gfs2_sbd *sdp, unsigned int nstruct,
 			    unsigned int ssize);
 
 int gfs2_log_reserve(struct gfs2_sbd *sdp, unsigned int blks);
-void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks);
 void gfs2_log_incr_head(struct gfs2_sbd *sdp);
 
 struct buffer_head *gfs2_log_get_buf(struct gfs2_sbd *sdp);
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index fae59d6..29a8689 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -52,6 +52,7 @@ static void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
 	if (bd->bd_ail)
 		list_move(&bd->bd_ail_st_list, &bd->bd_ail->ai_ail2_list);
 	get_bh(bh);
+	atomic_inc(&sdp->sd_log_pinned);
 }
 
 /**
@@ -90,6 +91,7 @@ static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh,
 	clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 	gfs2_log_unlock(sdp);
 	unlock_buffer(bh);
+	atomic_dec(&sdp->sd_log_pinned);
 }
 
 
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 4b1aced..9688785 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -303,6 +303,7 @@ void gfs2_remove_from_journal(struct buffer_head *bh, struct gfs2_trans *tr, int
 	struct gfs2_sbd *sdp = GFS2_SB(bh->b_page->mapping->host);
 	struct gfs2_bufdata *bd = bh->b_private;
 	if (test_clear_buffer_pinned(bh)) {
+		atomic_dec(&sdp->sd_log_pinned);
 		list_del_init(&bd->bd_le.le_list);
 		if (meta) {
 			gfs2_assert_warn(sdp, sdp->sd_log_num_buf);
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 1bba6ac..6f5fa5e 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -76,14 +76,15 @@ static struct gfs2_sbd *init_sbd(struct super_block *sb)
 	mutex_init(&sdp->sd_quota_mutex);
 
 	spin_lock_init(&sdp->sd_log_lock);
-
+	atomic_set(&sdp->sd_log_pinned, 0);
 	INIT_LIST_HEAD(&sdp->sd_log_le_buf);
 	INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
 	INIT_LIST_HEAD(&sdp->sd_log_le_rg);
 	INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
 	INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
 
-	mutex_init(&sdp->sd_log_reserve_mutex);
+	init_waitqueue_head(&sdp->sd_log_waitq);
+	init_waitqueue_head(&sdp->sd_logd_waitq);
 	INIT_LIST_HEAD(&sdp->sd_ail1_list);
 	INIT_LIST_HEAD(&sdp->sd_ail2_list);
 
@@ -340,6 +341,8 @@ static int init_journal(struct gfs2_sbd *sdp, int undo)
 	if (sdp->sd_args.ar_spectator) {
 		sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 		atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
+		atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
+		atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 	} else {
 		if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 			fs_err(sdp, "can't mount journal #%u\n",
@@ -377,6 +380,8 @@ static int init_journal(struct gfs2_sbd *sdp, int undo)
 			goto fail_jinode_gh;
 		}
 		atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
+		atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
+		atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 	}
 
 	if (sdp->sd_lockstruct.ls_first) {
@@ -608,9 +613,6 @@ static int init_threads(struct gfs2_sbd *sdp, int undo)
 	if (undo)
 		goto fail_quotad;
 
-	sdp->sd_log_flush_time = jiffies;
-	sdp->sd_jindex_refresh_time = jiffies;
-
 	p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 	error = IS_ERR(p);
 	if (error) {
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 2e74792..850df2b 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -52,10 +52,8 @@ void gfs2_tune_init(struct gfs2_tune *gt)
 	spin_lock_init(&gt->gt_spin);
 
 	gt->gt_demote_secs = 300;
-	gt->gt_incore_log_blocks = 1024;
-	gt->gt_log_flush_secs = 60;
 	gt->gt_recoverd_secs = 60;
-	gt->gt_logd_secs = 1;
+	gt->gt_logd_secs = 30;
 	gt->gt_quotad_secs = 5;
 	gt->gt_quota_simul_sync = 64;
 	gt->gt_quota_warn_period = 10;
diff --git a/fs/gfs2/sys.c b/fs/gfs2/sys.c
index 7f828a2..08bc548 100644
--- a/fs/gfs2/sys.c
+++ b/fs/gfs2/sys.c
@@ -426,8 +426,6 @@ static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 TUNE_ATTR_2(name, name##_store)
 
 TUNE_ATTR(demote_secs, 0);
-TUNE_ATTR(incore_log_blocks, 0);
-TUNE_ATTR(log_flush_secs, 0);
 TUNE_ATTR(quota_warn_period, 0);
 TUNE_ATTR(quota_quantum, 0);
 TUNE_ATTR(atime_quantum, 0);
@@ -447,8 +445,6 @@ TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 
 static struct attribute *tune_attrs[] = {
 	&tune_attr_demote_secs.attr,
-	&tune_attr_incore_log_blocks.attr,
-	&tune_attr_log_flush_secs.attr,
 	&tune_attr_quota_warn_period.attr,
 	&tune_attr_quota_quantum.attr,
 	&tune_attr_atime_quantum.attr,
diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c
index 73e5d92..cebca7b 100644
--- a/fs/gfs2/trans.c
+++ b/fs/gfs2/trans.c
@@ -79,6 +79,22 @@ fail_holder_uninit:
 	return error;
 }
 
+/**
+ * gfs2_log_release - Release a given number of log blocks
+ * @sdp: The GFS2 superblock
+ * @blks: The number of blocks
+ *
+ */
+
+static void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks)
+{
+
+	atomic_add(blks, &sdp->sd_log_blks_free);
+	gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
+				  sdp->sd_jdesc->jd_blocks);
+	up_read(&sdp->sd_log_flush_lock);
+}
+
 void gfs2_trans_end(struct gfs2_sbd *sdp)
 {
 	struct gfs2_trans *tr = current->journal_info;
-- 
1.5.1.2

[PATCH 27/58] [GFS2] remove unnecessary permission checks

[swhiteho]

From: Ryan O'Hara <rohara@redhat.com>

Remove read/write permission() checks from xattr operations.
VFS layer is already handling permission for xattrs via the
xattr_permission() call, so there is no need for gfs2 to
check permissions. Futhermore, using permission() for SELinux
xattrs ops is incorrect.

Signed-off-by: Ryan O'Hara <rohara@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/eaops.c b/fs/gfs2/eaops.c
index aa8dbf3..ef91b6e 100644
--- a/fs/gfs2/eaops.c
+++ b/fs/gfs2/eaops.c
@@ -59,9 +59,6 @@ unsigned int gfs2_ea_name2type(const char *name, const char **truncated_name)
 static int user_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 {
 	struct inode *inode = &ip->i_inode;
-	int error = permission(inode, MAY_READ, NULL);
-	if (error)
-		return error;
 
 	return gfs2_ea_get_i(ip, er);
 }
@@ -70,14 +67,6 @@ static int user_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 {
 	struct inode *inode = &ip->i_inode;
 
-	if (S_ISREG(inode->i_mode) ||
-	    (S_ISDIR(inode->i_mode) && !(inode->i_mode & S_ISVTX))) {
-		int error = permission(inode, MAY_WRITE, NULL);
-		if (error)
-			return error;
-	} else
-		return -EPERM;
-
 	return gfs2_ea_set_i(ip, er);
 }
 
@@ -85,14 +74,6 @@ static int user_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 {
 	struct inode *inode = &ip->i_inode;
 
-	if (S_ISREG(inode->i_mode) ||
-	    (S_ISDIR(inode->i_mode) && !(inode->i_mode & S_ISVTX))) {
-		int error = permission(inode, MAY_WRITE, NULL);
-		if (error)
-			return error;
-	} else
-		return -EPERM;
-
 	return gfs2_ea_remove_i(ip, er);
 }
 
@@ -108,8 +89,6 @@ static int system_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 	     GFS2_ACL_IS_DEFAULT(er->er_name, er->er_name_len)))
 		return -EOPNOTSUPP;
 
-
-
 	return gfs2_ea_get_i(ip, er);
 }
 
@@ -173,9 +152,6 @@ static int system_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 static int security_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 {
 	struct inode *inode = &ip->i_inode;
-	int error = permission(inode, MAY_READ, NULL);
-	if (error)
-		return error;
 
 	return gfs2_ea_get_i(ip, er);
 }
@@ -183,9 +159,6 @@ static int security_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 static int security_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 {
 	struct inode *inode = &ip->i_inode;
-	int error = permission(inode, MAY_WRITE, NULL);
-	if (error)
-		return error;
 
 	return gfs2_ea_set_i(ip, er);
 }
@@ -193,9 +166,6 @@ static int security_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 static int security_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 {
 	struct inode *inode = &ip->i_inode;
-	int error = permission(inode, MAY_WRITE, NULL);
-	if (error)
-		return error;
 
 	return gfs2_ea_remove_i(ip, er);
 }
-- 
1.5.1.2

[PATCH 28/58] [GFS2] Fix build warnings

[swhiteho]

From: Fabio Massimo Di Nitto <fabbione@ubuntu.com>

Hi Steven,

Steven Whitehouse wrote:
> Hi,
>
> Now in the -nmw git tree. Thanks,
>
> Steve.
>
> On Wed, 2007-11-21 at 11:54 -0600, Ryan O'Hara wrote:

this patch introduces a bunch of build warnings by leaving around

struct inode *inode = &ip->i_inode;

The patch in attachment cleans them up. Please apply.

Signed-off-by: Fabio Massimo Di Nitto <fabbione@ubuntu.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/eaops.c b/fs/gfs2/eaops.c
index ef91b6e..14fbd95 100644
--- a/fs/gfs2/eaops.c
+++ b/fs/gfs2/eaops.c
@@ -58,22 +58,16 @@ unsigned int gfs2_ea_name2type(const char *name, const char **truncated_name)
 
 static int user_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 {
-	struct inode *inode = &ip->i_inode;
-
 	return gfs2_ea_get_i(ip, er);
 }
 
 static int user_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 {
-	struct inode *inode = &ip->i_inode;
-
 	return gfs2_ea_set_i(ip, er);
 }
 
 static int user_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 {
-	struct inode *inode = &ip->i_inode;
-
 	return gfs2_ea_remove_i(ip, er);
 }
 
@@ -151,22 +145,16 @@ static int system_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 
 static int security_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 {
-	struct inode *inode = &ip->i_inode;
-
 	return gfs2_ea_get_i(ip, er);
 }
 
 static int security_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 {
-	struct inode *inode = &ip->i_inode;
-
 	return gfs2_ea_set_i(ip, er);
 }
 
 static int security_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 {
-	struct inode *inode = &ip->i_inode;
-
 	return gfs2_ea_remove_i(ip, er);
 }
 
-- 
1.5.1.2

[PATCH 29/58] [GFS2] Remove unrequired code

[swhiteho]

From: Fabio M. Di Nitto <fabbione@ubuntu.com>

Signed-off-by: Fabio M. Di Nitto <fabbione@ubuntu.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/eaops.c b/fs/gfs2/eaops.c
index 14fbd95..f114ba2 100644
--- a/fs/gfs2/eaops.c
+++ b/fs/gfs2/eaops.c
@@ -56,21 +56,6 @@ unsigned int gfs2_ea_name2type(const char *name, const char **truncated_name)
 	return type;
 }
 
-static int user_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
-{
-	return gfs2_ea_get_i(ip, er);
-}
-
-static int user_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
-{
-	return gfs2_ea_set_i(ip, er);
-}
-
-static int user_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
-{
-	return gfs2_ea_remove_i(ip, er);
-}
-
 static int system_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 {
 	if (!GFS2_ACL_IS_ACCESS(er->er_name, er->er_name_len) &&
@@ -143,25 +128,10 @@ static int system_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
 	return gfs2_ea_remove_i(ip, er);
 }
 
-static int security_eo_get(struct gfs2_inode *ip, struct gfs2_ea_request *er)
-{
-	return gfs2_ea_get_i(ip, er);
-}
-
-static int security_eo_set(struct gfs2_inode *ip, struct gfs2_ea_request *er)
-{
-	return gfs2_ea_set_i(ip, er);
-}
-
-static int security_eo_remove(struct gfs2_inode *ip, struct gfs2_ea_request *er)
-{
-	return gfs2_ea_remove_i(ip, er);
-}
-
 static const struct gfs2_eattr_operations gfs2_user_eaops = {
-	.eo_get = user_eo_get,
-	.eo_set = user_eo_set,
-	.eo_remove = user_eo_remove,
+	.eo_get = gfs2_ea_get_i,
+	.eo_set = gfs2_ea_set_i,
+	.eo_remove = gfs2_ea_remove_i,
 	.eo_name = "user",
 };
 
@@ -173,9 +143,9 @@ const struct gfs2_eattr_operations gfs2_system_eaops = {
 };
 
 static const struct gfs2_eattr_operations gfs2_security_eaops = {
-	.eo_get = security_eo_get,
-	.eo_set = security_eo_set,
-	.eo_remove = security_eo_remove,
+	.eo_get = gfs2_ea_get_i,
+	.eo_set = gfs2_ea_set_i,
+	.eo_remove = gfs2_ea_remove_i,
 	.eo_name = "security",
 };
 
-- 
1.5.1.2

[PATCH 30/58] [GFS2] Remove lock methods for lock_nolock protocol

[swhiteho]

From: Wendy Cheng <wcheng@redhat.com>

GFS2 supports two modes of locking - lock_nolock for single node filesystem
and lock_dlm for cluster mode locking. The gfs2 lock methods are removed from
file operation table for lock_nolock protocol. This would allow VFS to handle
posix lock and flock logics just like other in-tree filesystems without
duplication.

Signed-off-by: S. Wendy Cheng <wcheng@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 92959d0..53bca99 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -131,14 +131,21 @@ static struct inode *gfs2_iget_skip(struct super_block *sb,
 
 void gfs2_set_iop(struct inode *inode)
 {
+	struct gfs2_sbd *sdp = GFS2_SB(inode);
 	umode_t mode = inode->i_mode;
 
 	if (S_ISREG(mode)) {
 		inode->i_op = &gfs2_file_iops;
-		inode->i_fop = &gfs2_file_fops;
+		if (sdp->sd_args.ar_localflocks)
+			inode->i_fop = &gfs2_file_fops_nolock;
+		else
+			inode->i_fop = &gfs2_file_fops;
 	} else if (S_ISDIR(mode)) {
 		inode->i_op = &gfs2_dir_iops;
-		inode->i_fop = &gfs2_dir_fops;
+		if (sdp->sd_args.ar_localflocks)
+			inode->i_fop = &gfs2_dir_fops_nolock;
+		else
+			inode->i_fop = &gfs2_dir_fops;
 	} else if (S_ISLNK(mode)) {
 		inode->i_op = &gfs2_symlink_iops;
 	} else {
diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c
index ad5daaa..db76ac1 100644
--- a/fs/gfs2/ops_file.c
+++ b/fs/gfs2/ops_file.c
@@ -615,15 +615,6 @@ static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
 	if (__mandatory_lock(&ip->i_inode))
 		return -ENOLCK;
 
-	if (sdp->sd_args.ar_localflocks) {
-		if (IS_GETLK(cmd)) {
-			posix_test_lock(file, fl);
-			return 0;
-		} else {
-			return posix_lock_file_wait(file, fl);
-		}
-	}
-
 	if (cmd == F_CANCELLK) {
 		/* Hack: */
 		cmd = F_SETLK;
@@ -716,9 +707,6 @@ static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
 	if (__mandatory_lock(&ip->i_inode))
 		return -ENOLCK;
 
-	if (sdp->sd_args.ar_localflocks)
-		return flock_lock_file_wait(file, fl);
-
 	if (fl->fl_type == F_UNLCK) {
 		do_unflock(file, fl);
 		return 0;
@@ -755,3 +743,27 @@ const struct file_operations gfs2_dir_fops = {
 	.flock		= gfs2_flock,
 };
 
+const struct file_operations gfs2_file_fops_nolock = {
+	.llseek		= gfs2_llseek,
+	.read		= do_sync_read,
+	.aio_read	= generic_file_aio_read,
+	.write		= do_sync_write,
+	.aio_write	= generic_file_aio_write,
+	.unlocked_ioctl	= gfs2_ioctl,
+	.mmap		= gfs2_mmap,
+	.open		= gfs2_open,
+	.release	= gfs2_close,
+	.fsync		= gfs2_fsync,
+	.splice_read	= generic_file_splice_read,
+	.splice_write	= generic_file_splice_write,
+	.setlease	= gfs2_setlease,
+};
+
+const struct file_operations gfs2_dir_fops_nolock = {
+	.readdir	= gfs2_readdir,
+	.unlocked_ioctl	= gfs2_ioctl,
+	.open		= gfs2_open,
+	.release	= gfs2_close,
+	.fsync		= gfs2_fsync,
+};
+
diff --git a/fs/gfs2/ops_inode.h b/fs/gfs2/ops_inode.h
index edb519c..fd8cee2 100644
--- a/fs/gfs2/ops_inode.h
+++ b/fs/gfs2/ops_inode.h
@@ -18,6 +18,8 @@ extern const struct inode_operations gfs2_symlink_iops;
 extern const struct inode_operations gfs2_dev_iops;
 extern const struct file_operations gfs2_file_fops;
 extern const struct file_operations gfs2_dir_fops;
+extern const struct file_operations gfs2_file_fops_nolock;
+extern const struct file_operations gfs2_dir_fops_nolock;
 
 extern void gfs2_set_inode_flags(struct inode *inode);
 
-- 
1.5.1.2

[PATCH 31/58] [GFS2] patch to check for recursive lock requests in gfs2_rename code path

[swhiteho]

From: Abhijith Das <adas@redhat.com>

A certain scenario in the rename code path triggers a kernel BUG()
because it accidentally does recursive locking The first lock is
requested to unlink an already existing inode (replacing a file) and the
second lock is requested when the destination directory needs to alloc
some space. It is rare that these two
events happen during the same rename call, and even more rare that these
two instances try to lock the same rgrp. It is, however, possible.
https://bugzilla.redhat.com/show_bug.cgi?id=404711

Signed-off-by: Abhijith Das <adas@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 09848aa..e0ee195 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1063,22 +1063,30 @@ static struct inode *get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
 	int flags = LM_FLAG_TRY;
 	int skipped = 0;
 	int loops = 0;
-	int error;
+	int error, rg_locked;
 
 	/* Try recently successful rgrps */
 
 	rgd = recent_rgrp_first(sdp, ip->i_last_rg_alloc);
 
 	while (rgd) {
-		error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
-					   LM_FLAG_TRY, &al->al_rgd_gh);
+		rg_locked = 0;
+
+		if (gfs2_glock_is_locked_by_me(rgd->rd_gl)) {
+			rg_locked = 1;
+			error = 0;
+		} else {
+			error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
+						   LM_FLAG_TRY, &al->al_rgd_gh);
+		}
 		switch (error) {
 		case 0:
 			if (try_rgrp_fit(rgd, al))
 				goto out;
 			if (rgd->rd_flags & GFS2_RDF_CHECK)
 				inode = try_rgrp_unlink(rgd, last_unlinked);
-			gfs2_glock_dq_uninit(&al->al_rgd_gh);
+			if (!rg_locked)
+				gfs2_glock_dq_uninit(&al->al_rgd_gh);
 			if (inode)
 				return inode;
 			rgd = recent_rgrp_next(rgd, 1);
@@ -1098,15 +1106,23 @@ static struct inode *get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
 	begin = rgd = forward_rgrp_get(sdp);
 
 	for (;;) {
-		error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, flags,
-					  &al->al_rgd_gh);
+		rg_locked = 0;
+
+		if (gfs2_glock_is_locked_by_me(rgd->rd_gl)) {
+			rg_locked = 1;
+			error = 0;
+		} else {
+			error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, flags,
+						   &al->al_rgd_gh);
+		}
 		switch (error) {
 		case 0:
 			if (try_rgrp_fit(rgd, al))
 				goto out;
 			if (rgd->rd_flags & GFS2_RDF_CHECK)
 				inode = try_rgrp_unlink(rgd, last_unlinked);
-			gfs2_glock_dq_uninit(&al->al_rgd_gh);
+			if (!rg_locked)
+				gfs2_glock_dq_uninit(&al->al_rgd_gh);
 			if (inode)
 				return inode;
 			break;
@@ -1213,7 +1229,8 @@ void gfs2_inplace_release(struct gfs2_inode *ip)
 			     al->al_line);
 
 	al->al_rgd = NULL;
-	gfs2_glock_dq_uninit(&al->al_rgd_gh);
+	if (al->al_rgd_gh.gh_gl)
+		gfs2_glock_dq_uninit(&al->al_rgd_gh);
 	if (ip != GFS2_I(sdp->sd_rindex))
 		gfs2_glock_dq_uninit(&al->al_ri_gh);
 }
-- 
1.5.1.2

[PATCH 32/58] [GFS2] Remove unused variable

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c
index db76ac1..2569c13 100644
--- a/fs/gfs2/ops_file.c
+++ b/fs/gfs2/ops_file.c
@@ -700,7 +700,6 @@ static void do_unflock(struct file *file, struct file_lock *fl)
 static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
 {
 	struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
-	struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
 
 	if (!(fl->fl_flags & FL_FLOCK))
 		return -ENOLCK;
-- 
1.5.1.2

[PATCH 33/58] [GFS2] use pid for plock owner for nfs clients

[swhiteho]

From: David Teigland <teigland@redhat.com>

The fl_owner is that of lockd when posix locks arrive from nfs
clients, so it can't be used to distinguish between lock holders.
Use fl_pid as owner instead; it's the pid of the process on the
nfs client.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/locking/dlm/plock.c b/fs/gfs2/locking/dlm/plock.c
index 1f7b038..2ebd374 100644
--- a/fs/gfs2/locking/dlm/plock.c
+++ b/fs/gfs2/locking/dlm/plock.c
@@ -89,15 +89,19 @@ int gdlm_plock(void *lockspace, struct lm_lockname *name,
 	op->info.number		= name->ln_number;
 	op->info.start		= fl->fl_start;
 	op->info.end		= fl->fl_end;
-	op->info.owner		= (__u64)(long) fl->fl_owner;
 	if (fl->fl_lmops && fl->fl_lmops->fl_grant) {
+		/* fl_owner is lockd which doesn't distinguish
+		   processes on the nfs client */
+		op->info.owner	= (__u64) fl->fl_pid;
 		xop->callback	= fl->fl_lmops->fl_grant;
 		locks_init_lock(&xop->flc);
 		locks_copy_lock(&xop->flc, fl);
 		xop->fl		= fl;
 		xop->file	= file;
-	} else
+	} else {
+		op->info.owner	= (__u64)(long) fl->fl_owner;
 		xop->callback	= NULL;
+	}
 
 	send_op(op);
 
@@ -203,7 +207,10 @@ int gdlm_punlock(void *lockspace, struct lm_lockname *name,
 	op->info.number		= name->ln_number;
 	op->info.start		= fl->fl_start;
 	op->info.end		= fl->fl_end;
-	op->info.owner		= (__u64)(long) fl->fl_owner;
+	if (fl->fl_lmops && fl->fl_lmops->fl_grant)
+		op->info.owner	= (__u64) fl->fl_pid;
+	else
+		op->info.owner	= (__u64)(long) fl->fl_owner;
 
 	send_op(op);
 	wait_event(recv_wq, (op->done != 0));
@@ -242,7 +249,10 @@ int gdlm_plock_get(void *lockspace, struct lm_lockname *name,
 	op->info.number		= name->ln_number;
 	op->info.start		= fl->fl_start;
 	op->info.end		= fl->fl_end;
-	op->info.owner		= (__u64)(long) fl->fl_owner;
+	if (fl->fl_lmops && fl->fl_lmops->fl_grant)
+		op->info.owner	= (__u64) fl->fl_pid;
+	else
+		op->info.owner	= (__u64)(long) fl->fl_owner;
 
 	send_op(op);
 	wait_event(recv_wq, (op->done != 0));
-- 
1.5.1.2

[PATCH 34/58] [GFS2] Remove function gfs2_get_block

[swhiteho]

From: Bob Peterson <rpeterso@redhat.com>

This patch is just a cleanup.  Function gfs2_get_block() just calls
function gfs2_block_map reversing the last two parameters.  By
reversing the parameters, gfs2_block_map() may be called directly
and function gfs2_get_block may be eliminated altogether.
Since this function is done for every block operation,
this streamlines the code and makes it a little bit more efficient.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 1cfd493..4948602 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -452,8 +452,8 @@ static inline void bmap_unlock(struct inode *inode, int create)
  * Returns: errno
  */
 
-int gfs2_block_map(struct inode *inode, u64 lblock, int create,
-		   struct buffer_head *bh_map)
+int gfs2_block_map(struct inode *inode, sector_t lblock,
+		   struct buffer_head *bh_map, int create)
 {
 	struct gfs2_inode *ip = GFS2_I(inode);
 	struct gfs2_sbd *sdp = GFS2_SB(inode);
@@ -559,7 +559,7 @@ int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsi
 	BUG_ON(!new);
 
 	bh.b_size = 1 << (inode->i_blkbits + 5);
-	ret = gfs2_block_map(inode, lblock, create, &bh);
+	ret = gfs2_block_map(inode, lblock, &bh, create);
 	*extlen = bh.b_size >> inode->i_blkbits;
 	*dblock = bh.b_blocknr;
 	if (buffer_new(&bh))
@@ -909,7 +909,7 @@ static int gfs2_block_truncate_page(struct address_space *mapping)
 	err = 0;
 
 	if (!buffer_mapped(bh)) {
-		gfs2_get_block(inode, iblock, bh, 0);
+		gfs2_block_map(inode, iblock, bh, 0);
 		/* unmapped? It's a hole - nothing to do */
 		if (!buffer_mapped(bh))
 			goto unlock;
diff --git a/fs/gfs2/bmap.h b/fs/gfs2/bmap.h
index ac2fd04..4e6cde2 100644
--- a/fs/gfs2/bmap.h
+++ b/fs/gfs2/bmap.h
@@ -15,7 +15,7 @@ struct gfs2_inode;
 struct page;
 
 int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page);
-int gfs2_block_map(struct inode *inode, u64 lblock, int create, struct buffer_head *bh);
+int gfs2_block_map(struct inode *inode, sector_t lblock, struct buffer_head *bh, int create);
 int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen);
 
 int gfs2_truncatei(struct gfs2_inode *ip, u64 size);
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 143311c..7f9ab89 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -337,7 +337,7 @@ static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn)
 	struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
 
 	bh_map.b_size = 1 << inode->i_blkbits;
-	error = gfs2_block_map(inode, lbn, 0, &bh_map);
+	error = gfs2_block_map(inode, lbn, &bh_map, 0);
 	if (error || !bh_map.b_blocknr)
 		printk(KERN_INFO "error=%d, dbn=%llu lbn=%u", error,
 		       (unsigned long long)bh_map.b_blocknr, lbn);
diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index 7353933..8f94e30 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -59,22 +59,6 @@ static void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
 }
 
 /**
- * gfs2_get_block - Fills in a buffer head with details about a block
- * @inode: The inode
- * @lblock: The block number to look up
- * @bh_result: The buffer head to return the result in
- * @create: Non-zero if we may add block to the file
- *
- * Returns: errno
- */
-
-int gfs2_get_block(struct inode *inode, sector_t lblock,
-	           struct buffer_head *bh_result, int create)
-{
-	return gfs2_block_map(inode, lblock, create, bh_result);
-}
-
-/**
  * gfs2_get_block_noalloc - Fills in a buffer head with details about a block
  * @inode: The inode
  * @lblock: The block number to look up
@@ -89,7 +73,7 @@ static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
 {
 	int error;
 
-	error = gfs2_block_map(inode, lblock, 0, bh_result);
+	error = gfs2_block_map(inode, lblock, bh_result, 0);
 	if (error)
 		return error;
 	if (!buffer_mapped(bh_result))
@@ -100,7 +84,7 @@ static int gfs2_get_block_noalloc(struct inode *inode, sector_t lblock,
 static int gfs2_get_block_direct(struct inode *inode, sector_t lblock,
 				 struct buffer_head *bh_result, int create)
 {
-	return gfs2_block_map(inode, lblock, 0, bh_result);
+	return gfs2_block_map(inode, lblock, bh_result, 0);
 }
 
 /**
@@ -504,7 +488,7 @@ static int __gfs2_readpage(void *file, struct page *page)
 		error = stuffed_readpage(ip, page);
 		unlock_page(page);
 	} else {
-		error = mpage_readpage(page, gfs2_get_block);
+		error = mpage_readpage(page, gfs2_block_map);
 	}
 
 	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
@@ -598,7 +582,7 @@ int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state,
  *    Any I/O we ignore at this time will be done via readpage later.
  * 2. We don't handle stuffed files here we let readpage do the honours.
  * 3. mpage_readpages() does most of the heavy lifting in the common case.
- * 4. gfs2_get_block() is relied upon to set BH_Boundary in the right places.
+ * 4. gfs2_block_map() is relied upon to set BH_Boundary in the right places.
  */
 
 static int gfs2_readpages(struct file *file, struct address_space *mapping,
@@ -615,7 +599,7 @@ static int gfs2_readpages(struct file *file, struct address_space *mapping,
 	if (unlikely(ret))
 		goto out_uninit;
 	if (!gfs2_is_stuffed(ip))
-		ret = mpage_readpages(mapping, pages, nr_pages, gfs2_get_block);
+		ret = mpage_readpages(mapping, pages, nr_pages, gfs2_block_map);
 	gfs2_glock_dq(&gh);
 out_uninit:
 	gfs2_holder_uninit(&gh);
@@ -710,7 +694,7 @@ static int gfs2_write_begin(struct file *file, struct address_space *mapping,
 	}
 
 prepare_write:
-	error = block_prepare_write(page, from, to, gfs2_get_block);
+	error = block_prepare_write(page, from, to, gfs2_block_map);
 out:
 	if (error == 0)
 		return 0;
@@ -923,7 +907,7 @@ static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
 		return 0;
 
 	if (!gfs2_is_stuffed(ip))
-		dblock = generic_block_bmap(mapping, lblock, gfs2_get_block);
+		dblock = generic_block_bmap(mapping, lblock, gfs2_block_map);
 
 	gfs2_glock_dq_uninit(&i_gh);
 
diff --git a/fs/gfs2/ops_address.h b/fs/gfs2/ops_address.h
index d3b76d0..5da2128 100644
--- a/fs/gfs2/ops_address.h
+++ b/fs/gfs2/ops_address.h
@@ -14,8 +14,6 @@
 #include <linux/buffer_head.h>
 #include <linux/mm.h>
 
-extern int gfs2_get_block(struct inode *inode, sector_t lblock,
-			  struct buffer_head *bh_result, int create);
 extern int gfs2_releasepage(struct page *page, gfp_t gfp_mask);
 extern int gfs2_internal_read(struct gfs2_inode *ip,
 			      struct file_ra_state *ra_state,
diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c
index 2569c13..597f7ff 100644
--- a/fs/gfs2/ops_file.c
+++ b/fs/gfs2/ops_file.c
@@ -323,7 +323,7 @@ static int gfs2_allocate_page_backing(struct page *page)
 	do {
 		bh.b_state = 0;
 		bh.b_size = size;
-		gfs2_block_map(inode, lblock, 1, &bh);
+		gfs2_block_map(inode, lblock, &bh, 1);
 		if (!buffer_mapped(&bh))
 			return -EIO;
 		size -= bh.b_size;
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 4996f0e..8b4c20c 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -276,7 +276,7 @@ static int bh_get(struct gfs2_quota_data *qd)
 	offset = qd->qd_slot % sdp->sd_qc_per_block;;
 
 	bh_map.b_size = 1 << ip->i_inode.i_blkbits;
-	error = gfs2_block_map(&ip->i_inode, block, 0, &bh_map);
+	error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
 	if (error)
 		goto fail;
 	error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
@@ -645,7 +645,7 @@ static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 	}
 
 	if (!buffer_mapped(bh)) {
-		gfs2_get_block(inode, iblock, bh, 1);
+		gfs2_block_map(inode, iblock, bh, 1);
 		if (!buffer_mapped(bh))
 			goto unlock;
 	}
diff --git a/fs/gfs2/recovery.c b/fs/gfs2/recovery.c
index beb6c7a..27c994f 100644
--- a/fs/gfs2/recovery.c
+++ b/fs/gfs2/recovery.c
@@ -391,7 +391,7 @@ static int clean_journal(struct gfs2_jdesc *jd, struct gfs2_log_header_host *hea
 	lblock = head->lh_blkno;
 	gfs2_replay_incr_blk(sdp, &lblock);
 	bh_map.b_size = 1 << ip->i_inode.i_blkbits;
-	error = gfs2_block_map(&ip->i_inode, lblock, 0, &bh_map);
+	error = gfs2_block_map(&ip->i_inode, lblock, &bh_map, 0);
 	if (error)
 		return error;
 	if (!bh_map.b_blocknr) {
-- 
1.5.1.2

[PATCH 35/58] [GFS2] Fix typo in log.c

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

An inequality was the wrong way around causing gfs2_logd to wake
up too often. This fixes it.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 7f9ab89..9bece94 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -802,7 +802,7 @@ void gfs2_log_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 	up_read(&sdp->sd_log_flush_lock);
 
 	if (atomic_read(&sdp->sd_log_pinned) > atomic_read(&sdp->sd_log_thresh1) ||
-	    ((sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free)) <
+	    ((sdp->sd_jdesc->jd_blocks - atomic_read(&sdp->sd_log_blks_free)) >
 	    atomic_read(&sdp->sd_log_thresh2)))
 		wake_up(&sdp->sd_logd_waitq);
 }
-- 
1.5.1.2

[PATCH 36/58] [GFS2] Journal extent mapping

[swhiteho]

From: Bob Peterson <rpeterso@redhat.com>

This patch saves a little time when gfs2 writes to the journals by
keeping a mapping between logical and physical blocks on disk.
That's better than constantly looking up indirect pointers in
buffers, when the journals are several levels of indirection
(which they typically are).

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 743ebba..14862d1 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
- * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
+ * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
  *
  * This copyrighted material is made available to anyone wishing to use,
  * modify, copy, or redistribute it subject to the terms and conditions
@@ -360,8 +360,17 @@ struct gfs2_ail {
 	u64 ai_sync_gen;
 };
 
+struct gfs2_journal_extent {
+	struct list_head extent_list;
+
+	unsigned int lblock; /* First logical block */
+	u64 dblock; /* First disk block */
+	u64 blocks;
+};
+
 struct gfs2_jdesc {
 	struct list_head jd_list;
+	struct list_head extent_list;
 
 	struct inode *jd_inode;
 	unsigned int jd_jid;
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 9bece94..0833e27 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
- * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
+ * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
  *
  * This copyrighted material is made available to anyone wishing to use,
  * modify, copy, or redistribute it subject to the terms and conditions
@@ -332,18 +332,14 @@ retry:
 
 static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn)
 {
-	struct inode *inode = sdp->sd_jdesc->jd_inode;
-	int error;
-	struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
-
-	bh_map.b_size = 1 << inode->i_blkbits;
-	error = gfs2_block_map(inode, lbn, &bh_map, 0);
-	if (error || !bh_map.b_blocknr)
-		printk(KERN_INFO "error=%d, dbn=%llu lbn=%u", error,
-		       (unsigned long long)bh_map.b_blocknr, lbn);
-	gfs2_assert_withdraw(sdp, !error && bh_map.b_blocknr);
-
-	return bh_map.b_blocknr;
+	struct gfs2_journal_extent *je;
+
+	list_for_each_entry(je, &sdp->sd_jdesc->extent_list, extent_list) {
+		if (lbn >= je->lblock && lbn < je->lblock + je->blocks)
+			return je->dblock + lbn;
+	}
+
+	return -1;
 }
 
 /**
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 6f5fa5e..35ec630 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
- * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
+ * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
  *
  * This copyrighted material is made available to anyone wishing to use,
  * modify, copy, or redistribute it subject to the terms and conditions
@@ -21,6 +21,7 @@
 
 #include "gfs2.h"
 #include "incore.h"
+#include "bmap.h"
 #include "daemon.h"
 #include "glock.h"
 #include "glops.h"
@@ -303,6 +304,68 @@ out:
 	return error;
 }
 
+/**
+ * map_journal_extents - create a reusable "extent" mapping from all logical
+ * blocks to all physical blocks for the given journal.  This will save
+ * us time when writing journal blocks.  Most journals will have only one
+ * extent that maps all their logical blocks.  That's because gfs2.mkfs
+ * arranges the journal blocks sequentially to maximize performance.
+ * So the extent would map the first block for the entire file length.
+ * However, gfs2_jadd can happen while file activity is happening, so
+ * those journals may not be sequential.  Less likely is the case where
+ * the users created their own journals by mounting the metafs and
+ * laying it out.  But it's still possible.  These journals might have
+ * several extents.
+ *
+ * TODO: This should be done in bigger chunks rather than one block at a time,
+ *       but since it's only done at mount time, I'm not worried about the
+ *       time it takes.
+ */
+static int map_journal_extents(struct gfs2_sbd *sdp)
+{
+	struct gfs2_jdesc *jd = sdp->sd_jdesc;
+	unsigned int lb;
+	u64 db, prev_db; /* logical block, disk block, prev disk block */
+	struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
+	struct gfs2_journal_extent *jext = NULL;
+	struct buffer_head bh;
+	int rc = 0;
+
+	INIT_LIST_HEAD(&jd->extent_list);
+	prev_db = 0;
+
+	for (lb = 0; lb < ip->i_di.di_size / sdp->sd_sb.sb_bsize; lb++) {
+		bh.b_state = 0;
+		bh.b_blocknr = 0;
+		bh.b_size = 1 << ip->i_inode.i_blkbits;
+		rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
+		db = bh.b_blocknr;
+		if (rc || !db) {
+			printk(KERN_INFO "GFS2 journal mapping error %d: lb="
+			       "%u db=%llu\n", rc, lb, (unsigned long long)db);
+			break;
+		}
+		if (!prev_db || db != prev_db + 1) {
+			jext = kzalloc(sizeof(struct gfs2_journal_extent),
+				       GFP_KERNEL);
+			if (!jext) {
+				printk(KERN_INFO "GFS2 error: out of memory "
+				       "mapping journal extents.\n");
+				rc = -ENOMEM;
+				break;
+			}
+			jext->dblock = db;
+			jext->lblock = lb;
+			jext->blocks = 1;
+			list_add_tail(&jext->extent_list, &jd->extent_list);
+		} else {
+			jext->blocks++;
+		}
+		prev_db = db;
+	}
+	return rc;
+}
+
 static int init_journal(struct gfs2_sbd *sdp, int undo)
 {
 	struct gfs2_holder ji_gh;
@@ -382,6 +445,9 @@ static int init_journal(struct gfs2_sbd *sdp, int undo)
 		atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 		atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 		atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
+
+		/* Map the extents for this journal's blocks */
+		map_journal_extents(sdp);
 	}
 
 	if (sdp->sd_lockstruct.ls_first) {
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 850df2b..dda7747 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
- * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
+ * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
  *
  * This copyrighted material is made available to anyone wishing to use,
  * modify, copy, or redistribute it subject to the terms and conditions
@@ -414,8 +414,9 @@ int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 
 void gfs2_jindex_free(struct gfs2_sbd *sdp)
 {
-	struct list_head list;
+	struct list_head list, *head;
 	struct gfs2_jdesc *jd;
+	struct gfs2_journal_extent *jext;
 
 	spin_lock(&sdp->sd_jindex_spin);
 	list_add(&list, &sdp->sd_jindex_list);
@@ -425,6 +426,14 @@ void gfs2_jindex_free(struct gfs2_sbd *sdp)
 
 	while (!list_empty(&list)) {
 		jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
+		head = &jd->extent_list;
+		while (!list_empty(head)) {
+			jext = list_entry(head->next,
+					  struct gfs2_journal_extent,
+					  extent_list);
+			list_del(&jext->extent_list);
+			kfree(jext);
+		}
 		list_del(&jd->jd_list);
 		iput(jd->jd_inode);
 		kfree(jd);
-- 
1.5.1.2

[PATCH 37/58] [GFS2] Get rid of useless "found" variable in quota.c

[swhiteho]

From: Bob Peterson <rpeterso@redhat.com>

This just eliminates an unused variable from the quota code.
Not likely to be a time saver.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 8b4c20c..60cc50f 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
- * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
+ * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
  *
  * This copyrighted material is made available to anyone wishing to use,
  * modify, copy, or redistribute it subject to the terms and conditions
@@ -273,7 +273,7 @@ static int bh_get(struct gfs2_quota_data *qd)
 	}
 
 	block = qd->qd_slot / sdp->sd_qc_per_block;
-	offset = qd->qd_slot % sdp->sd_qc_per_block;;
+	offset = qd->qd_slot % sdp->sd_qc_per_block;
 
 	bh_map.b_size = 1 << ip->i_inode.i_blkbits;
 	error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
@@ -1016,7 +1016,6 @@ void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
 	struct gfs2_alloc *al = &ip->i_alloc;
 	struct gfs2_quota_data *qd;
 	unsigned int x;
-	unsigned int found = 0;
 
 	if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
 		return;
@@ -1029,7 +1028,6 @@ void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
 		if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
 		    (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
 			do_qc(qd, change);
-			found++;
 		}
 	}
 }
-- 
1.5.1.2

[PATCH 38/58] [GFS2] Run through full bitmaps quicker in gfs2_bitfit

[swhiteho]

From: Bob Peterson <rpeterso@redhat.com>

I eliminated the passing of an unused parameter into gfs2_bitfit called rgd.

This also changes the gfs2_bitfit code that searches for free (or used) blocks.
Before, the code was trying to check for bytes that indicated 4 blocks in
the undesired state.  The problem is, it was spending more time trying to
do this than it actually was saving.  This version only optimizes the case
where we're looking for free blocks, and it checks a machine word at a time.
So on 32-bit machines, it will check 32-bits (16 blocks) and on 64-bit
machines, it will check 64-bits (32 blocks) at a time.  The compiler
optimizes that quite well and we save some time, especially when running
through full bitmaps (like the bitmaps allocated for the journals).

There's probably a more elegant or optimized way to do this, but I haven't
thought of it yet.  I'm open to suggestions.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index e0ee195..d7ff9cf 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -126,41 +126,46 @@ static unsigned char gfs2_testbit(struct gfs2_rgrpd *rgd, unsigned char *buffer,
  * Return: the block number (bitmap buffer scope) that was found
  */
 
-static u32 gfs2_bitfit(struct gfs2_rgrpd *rgd, unsigned char *buffer,
-			    unsigned int buflen, u32 goal,
-			    unsigned char old_state)
+static u32 gfs2_bitfit(unsigned char *buffer, unsigned int buflen, u32 goal,
+		       unsigned char old_state)
 {
-	unsigned char *byte, *end, alloc;
+	unsigned char *byte;
 	u32 blk = goal;
-	unsigned int bit;
+	unsigned int bit, bitlong;
+	unsigned long *plong, plong55;
+	static int c = 0;
 
 	byte = buffer + (goal / GFS2_NBBY);
+	plong = buffer + (goal / GFS2_NBBY);
 	bit = (goal % GFS2_NBBY) * GFS2_BIT_SIZE;
-	end = buffer + buflen;
-	alloc = (old_state == GFS2_BLKST_FREE) ? 0x55 : 0;
-
-	while (byte < end) {
-		/* If we're looking for a free block we can eliminate all
-		   bitmap settings with 0x55, which represents four data
-		   blocks in a row.  If we're looking for a data block, we can
-		   eliminate 0x00 which corresponds to four free blocks. */
-		if ((*byte & 0x55) == alloc) {
-			blk += (8 - bit) >> 1;
-
-			bit = 0;
-			byte++;
-
+	bitlong = bit;
+#if BITS_PER_LONG == 32
+	plong55 = 0x55555555;
+#else
+	plong55 = 0x5555555555555555;
+#endif
+	while (byte < buffer + buflen) {
+
+		if (bitlong == 0 && old_state == 0 && *plong == plong55) {
+			plong++;
+			byte += sizeof(unsigned long);
+			blk += sizeof(unsigned long) * GFS2_NBBY;
 			continue;
 		}
-
-		if (((*byte >> bit) & GFS2_BIT_MASK) == old_state)
+		if (((*byte >> bit) & GFS2_BIT_MASK) == old_state) {
+			c++;
 			return blk;
-
+		}
 		bit += GFS2_BIT_SIZE;
 		if (bit >= 8) {
 			bit = 0;
 			byte++;
 		}
+		bitlong += GFS2_BIT_SIZE;
+		if (bitlong >= sizeof(unsigned long) * 8) {
+			bitlong = 0;
+			plong++;
+		}
 
 		blk++;
 	}
@@ -1318,11 +1323,10 @@ static u32 rgblk_search(struct gfs2_rgrpd *rgd, u32 goal,
 		/* The GFS2_BLKST_UNLINKED state doesn't apply to the clone
 		   bitmaps, so we must search the originals for that. */
 		if (old_state != GFS2_BLKST_UNLINKED && bi->bi_clone)
-			blk = gfs2_bitfit(rgd, bi->bi_clone + bi->bi_offset,
+			blk = gfs2_bitfit(bi->bi_clone + bi->bi_offset,
 					  bi->bi_len, goal, old_state);
 		else
-			blk = gfs2_bitfit(rgd,
-					  bi->bi_bh->b_data + bi->bi_offset,
+			blk = gfs2_bitfit(bi->bi_bh->b_data + bi->bi_offset,
 					  bi->bi_len, goal, old_state);
 		if (blk != BFITNOENT)
 			break;
-- 
1.5.1.2

[PATCH 39/58] [GFS2] Reorganize function gfs2_glmutex_lock

[swhiteho]

From: Bob Peterson <rpeterso@redhat.com>

This patch optimizes the function gfs2_glmutex_lock.
The basic theory is: Why bother initializing a holder, setting up
wait bits and then waiting on them, if you know the glock can be
yours.  So the holder stuff is placed inside the if checking if the
glock is locked.  This one needs careful scrutiny because changing
anything to do with locking should strike terror into one's heart.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index a7f3c46..80e09c5 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
- * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
+ * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
  *
  * This copyrighted material is made available to anyone wishing to use,
  * modify, copy, or redistribute it subject to the terms and conditions
@@ -620,26 +620,21 @@ static void run_queue(struct gfs2_glock *gl)
 
 static void gfs2_glmutex_lock(struct gfs2_glock *gl)
 {
-	struct gfs2_holder gh;
-
-	gfs2_holder_init(gl, 0, 0, &gh);
-	if (test_and_set_bit(HIF_WAIT, &gh.gh_iflags))
-		BUG();
-
 	spin_lock(&gl->gl_spin);
 	if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) {
+		struct gfs2_holder gh;
+
+		gfs2_holder_init(gl, 0, 0, &gh);
+		set_bit(HIF_WAIT, &gh.gh_iflags);
 		list_add_tail(&gh.gh_list, &gl->gl_waiters1);
+		spin_unlock(&gl->gl_spin);
+		wait_on_holder(&gh);
+		gfs2_holder_uninit(&gh);
 	} else {
 		gl->gl_owner_pid = current->pid;
 		gl->gl_ip = (unsigned long)__builtin_return_address(0);
-		clear_bit(HIF_WAIT, &gh.gh_iflags);
-		smp_mb();
-		wake_up_bit(&gh.gh_iflags, HIF_WAIT);
+		spin_unlock(&gl->gl_spin);
 	}
-	spin_unlock(&gl->gl_spin);
-
-	wait_on_holder(&gh);
-	gfs2_holder_uninit(&gh);
 }
 
 /**
-- 
1.5.1.2

[PATCH 40/58] [GFS2] Only fetch the dinode once in block_map

[swhiteho]

From: Bob Peterson <rpeterso@redhat.com>

Function gfs2_block_map was often looking up the disk inode twice.
This optimizes it so that only does it once.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 4948602..2241141 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -469,6 +469,7 @@ int gfs2_block_map(struct inode *inode, sector_t lblock,
 	unsigned int maxlen = bh_map->b_size >> inode->i_blkbits;
 	struct metapath mp;
 	u64 size;
+	struct buffer_head *dibh = NULL;
 
 	BUG_ON(maxlen == 0);
 
@@ -499,6 +500,8 @@ int gfs2_block_map(struct inode *inode, sector_t lblock,
 	error = gfs2_meta_inode_buffer(ip, &bh);
 	if (error)
 		goto out_fail;
+	dibh = bh;
+	get_bh(dibh);
 
 	for (x = 0; x < end_of_metadata; x++) {
 		lookup_block(ip, bh, x, &mp, create, &new, &dblock);
@@ -517,13 +520,8 @@ int gfs2_block_map(struct inode *inode, sector_t lblock,
 		if (boundary)
 			set_buffer_boundary(bh_map);
 		if (new) {
-			struct buffer_head *dibh;
-			error = gfs2_meta_inode_buffer(ip, &dibh);
-			if (!error) {
-				gfs2_trans_add_bh(ip->i_gl, dibh, 1);
-				gfs2_dinode_out(ip, dibh->b_data);
-				brelse(dibh);
-			}
+			gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+			gfs2_dinode_out(ip, dibh->b_data);
 			set_buffer_new(bh_map);
 			goto out_brelse;
 		}
@@ -544,6 +542,8 @@ out_brelse:
 out_ok:
 	error = 0;
 out_fail:
+	if (dibh)
+		brelse(dibh);
 	bmap_unlock(inode, create);
 	return error;
 }
-- 
1.5.1.2

[PATCH 41/58] [GFS2] Function meta_read optimization

[swhiteho]

From: Bob Peterson <rpeterso@redhat.com>

This patch optimizes function gfs2_meta_read.  Basically, gfs2_meta_wait
was being called regardless of whether a disk read was requested.
This just pulls that wait into the if that triggers the read.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 9688785..bc28bc6 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -222,13 +222,14 @@ int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
 		   struct buffer_head **bhp)
 {
 	*bhp = getbuf(gl, blkno, CREATE);
-	if (!buffer_uptodate(*bhp))
+	if (!buffer_uptodate(*bhp)) {
 		ll_rw_block(READ_META, 1, bhp);
-	if (flags & DIO_WAIT) {
-		int error = gfs2_meta_wait(gl->gl_sbd, *bhp);
-		if (error) {
-			brelse(*bhp);
-			return error;
+		if (flags & DIO_WAIT) {
+			int error = gfs2_meta_wait(gl->gl_sbd, *bhp);
+			if (error) {
+				brelse(*bhp);
+				return error;
+			}
 		}
 	}
 
-- 
1.5.1.2

[PATCH 42/58] [GFS2] Incremental patch to fix compiler warning

[swhiteho]

From: Bob Peterson <rpeterso@redhat.com>

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index d7ff9cf..68c4bf3 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -133,10 +133,9 @@ static u32 gfs2_bitfit(unsigned char *buffer, unsigned int buflen, u32 goal,
 	u32 blk = goal;
 	unsigned int bit, bitlong;
 	unsigned long *plong, plong55;
-	static int c = 0;
 
 	byte = buffer + (goal / GFS2_NBBY);
-	plong = buffer + (goal / GFS2_NBBY);
+	plong = (unsigned long *)(buffer + (goal / GFS2_NBBY));
 	bit = (goal % GFS2_NBBY) * GFS2_BIT_SIZE;
 	bitlong = bit;
 #if BITS_PER_LONG == 32
@@ -152,10 +151,8 @@ static u32 gfs2_bitfit(unsigned char *buffer, unsigned int buflen, u32 goal,
 			blk += sizeof(unsigned long) * GFS2_NBBY;
 			continue;
 		}
-		if (((*byte >> bit) & GFS2_BIT_MASK) == old_state) {
-			c++;
+		if (((*byte >> bit) & GFS2_BIT_MASK) == old_state)
 			return blk;
-		}
 		bit += GFS2_BIT_SIZE;
 		if (bit >= 8) {
 			bit = 0;
-- 
1.5.1.2

[PATCH 43/58] [GFS2] Eliminate the no longer needed sd_statfs_mutex

[swhiteho]

From: Bob Peterson <rpeterso@redhat.com>

This patch eliminates the unneeded sd_statfs_mutex mutex but preserves
the ordering as discussed.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 14862d1..9a83429 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -527,7 +527,6 @@ struct gfs2_sbd {
 	/* StatFS stuff */
 
 	spinlock_t sd_statfs_spin;
-	struct mutex sd_statfs_mutex;
 	struct gfs2_statfs_change_host sd_statfs_master;
 	struct gfs2_statfs_change_host sd_statfs_local;
 	unsigned long sd_statfs_sync_time;
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 35ec630..22e260e 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -60,7 +60,6 @@ static struct gfs2_sbd *init_sbd(struct super_block *sb)
 
 	mutex_init(&sdp->sd_inum_mutex);
 	spin_lock_init(&sdp->sd_statfs_spin);
-	mutex_init(&sdp->sd_statfs_mutex);
 
 	spin_lock_init(&sdp->sd_rindex_spin);
 	mutex_init(&sdp->sd_rindex_mutex);
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index dda7747..73e49df 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -686,9 +686,7 @@ void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
 	if (error)
 		return;
 
-	mutex_lock(&sdp->sd_statfs_mutex);
 	gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
-	mutex_unlock(&sdp->sd_statfs_mutex);
 
 	spin_lock(&sdp->sd_statfs_spin);
 	l_sc->sc_total += total;
@@ -736,9 +734,7 @@ int gfs2_statfs_sync(struct gfs2_sbd *sdp)
 	if (error)
 		goto out_bh2;
 
-	mutex_lock(&sdp->sd_statfs_mutex);
 	gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
-	mutex_unlock(&sdp->sd_statfs_mutex);
 
 	spin_lock(&sdp->sd_statfs_spin);
 	m_sc->sc_total += l_sc->sc_total;
-- 
1.5.1.2

[PATCH 44/58] [GFS2] Minor correction

[swhiteho]

From: Bob Peterson <rpeterso@redhat.com>

This is a small correction to my previously posted patch1.
It just changes a divide to a shift.  It's faster and doesn't
introduce odd dependencies on 32-bit compiles.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 22e260e..a77d41f 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -333,7 +333,7 @@ static int map_journal_extents(struct gfs2_sbd *sdp)
 	INIT_LIST_HEAD(&jd->extent_list);
 	prev_db = 0;
 
-	for (lb = 0; lb < ip->i_di.di_size / sdp->sd_sb.sb_bsize; lb++) {
+	for (lb = 0; lb < ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift; lb++) {
 		bh.b_state = 0;
 		bh.b_blocknr = 0;
 		bh.b_size = 1 << ip->i_inode.i_blkbits;
-- 
1.5.1.2

[PATCH 45/58] [GFS2] Fix log block mapper

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

A missing offset in the calculation.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 0833e27..40c51bf 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -336,7 +336,7 @@ static u64 log_bmap(struct gfs2_sbd *sdp, unsigned int lbn)
 
 	list_for_each_entry(je, &sdp->sd_jdesc->extent_list, extent_list) {
 		if (lbn >= je->lblock && lbn < je->lblock + je->blocks)
-			return je->dblock + lbn;
+			return je->dblock + lbn - je->lblock;
 	}
 
 	return -1;
-- 
1.5.1.2

[PATCH 46/58] [GFS2] Remove unused variable

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

The go_drop_th function is never called or referenced.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 9a83429..c85f4fd 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -131,7 +131,6 @@ struct gfs2_bufdata {
 struct gfs2_glock_operations {
 	void (*go_xmote_th) (struct gfs2_glock *gl);
 	void (*go_xmote_bh) (struct gfs2_glock *gl);
-	void (*go_drop_th) (struct gfs2_glock *gl);
 	void (*go_inval) (struct gfs2_glock *gl, int flags);
 	int (*go_demote_ok) (struct gfs2_glock *gl);
 	int (*go_lock) (struct gfs2_holder *gh);
-- 
1.5.1.2

[PATCH 47/58] [GFS2] Allow page migration for writeback and ordered pages

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

To improve performance on NUMA, we use the VM's standard page
migration for writeback and ordered pages. Probably we could
also do the same for journaled data, but that would need a
careful audit of the code, so will be the subject of a later
patch.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index 8f94e30..e16ad81 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -1098,6 +1098,7 @@ static const struct address_space_operations gfs2_writeback_aops = {
 	.invalidatepage = gfs2_invalidatepage,
 	.releasepage = gfs2_releasepage,
 	.direct_IO = gfs2_direct_IO,
+	.migratepage = buffer_migrate_page,
 };
 
 static const struct address_space_operations gfs2_ordered_aops = {
@@ -1112,6 +1113,7 @@ static const struct address_space_operations gfs2_ordered_aops = {
 	.invalidatepage = gfs2_invalidatepage,
 	.releasepage = gfs2_releasepage,
 	.direct_IO = gfs2_direct_IO,
+	.migratepage = buffer_migrate_page,
 };
 
 static const struct address_space_operations gfs2_jdata_aops = {
-- 
1.5.1.2

[PATCH 48/58] [GFS2] Initialize extent_list earlier

[swhiteho]

From: Bob Peterson <rpeterso@redhat.com>

Here is a patch for the latest upstream GFS2 code:
The journal extent map needs to be initialized sooner than it
currently is.  Otherwise failed mount attempts (e.g. not enough
journals, etc.) may panic trying to access the uninitialized list.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index a77d41f..9ffc10b 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -330,7 +330,6 @@ static int map_journal_extents(struct gfs2_sbd *sdp)
 	struct buffer_head bh;
 	int rc = 0;
 
-	INIT_LIST_HEAD(&jd->extent_list);
 	prev_db = 0;
 
 	for (lb = 0; lb < ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift; lb++) {
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 73e49df..fa86038 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -385,6 +385,7 @@ int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 		if (!jd)
 			break;
 
+		INIT_LIST_HEAD(&jd->extent_list);
 		jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1, NULL);
 		if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
 			if (!jd->jd_inode)
-- 
1.5.1.2

[PATCH 49/58] [GFS2] Fix problems relating to execution of files on GFS2

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

This patch fixes a couple of problems which affected the execution of files
on GFS2. The first is that there was a corner case where inodes were not
always uptodate at the point at which permissions checks were being carried
out, this was resulting in refusal of execute permission, but only on the
first lookup, subsequent requests worked correctly. The second was a problem
relating to incorrect updating of file sizes which was introduced with the
write_begin/end code for GFS2 a little while back.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Cc: Abhijith Das <adas@redhat.com>

diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index e16ad81..37406a3 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -848,14 +848,11 @@ static int gfs2_write_end(struct file *file, struct address_space *mapping,
 
 	ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
 
-	if (likely(ret >= 0)) {
-		copied = ret;
-		if  ((pos + copied) > inode->i_size) {
-			di = (struct gfs2_dinode *)dibh->b_data;
-			ip->i_di.di_size = inode->i_size;
-			di->di_size = cpu_to_be64(inode->i_size);
-			mark_inode_dirty(inode);
-		}
+	if (likely(ret >= 0) && (inode->i_size > ip->i_di.di_size)) {
+		di = (struct gfs2_dinode *)dibh->b_data;
+		ip->i_di.di_size = inode->i_size;
+		di->di_size = cpu_to_be64(inode->i_size);
+		mark_inode_dirty(inode);
 	}
 
 	if (inode == sdp->sd_rindex)
diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
index 291f0c7..8386ab3 100644
--- a/fs/gfs2/ops_inode.c
+++ b/fs/gfs2/ops_inode.c
@@ -113,8 +113,18 @@ static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
 	if (inode && IS_ERR(inode))
 		return ERR_PTR(PTR_ERR(inode));
 
-	if (inode)
+	if (inode) {
+		struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
+		struct gfs2_holder gh;
+		int error;
+		error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
+		if (error) {
+			iput(inode);
+			return ERR_PTR(error);
+		}
+		gfs2_glock_dq_uninit(&gh);
 		return d_splice_alias(inode, dentry);
+	}
 	d_add(dentry, inode);
 
 	return NULL;
-- 
1.5.1.2

[PATCH 50/58] [GFS2] Fix assert in log code

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

Although the values were all being calculated correctly, there was a
race in the assert due to the way it was using atomic variables. This
changes the value we assert on so that we get the same effect by testing
a different variable. This prevents the assert triggering when it shouldn't.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 40c51bf..6e6a104 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -749,7 +749,7 @@ void __gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl)
 static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 {
 	unsigned int reserved;
-	unsigned int old;
+	unsigned int unused;
 
 	gfs2_log_lock(sdp);
 
@@ -761,14 +761,11 @@ static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 	sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;
 	gfs2_assert_withdraw(sdp, ((int)sdp->sd_log_commited_revoke) >= 0);
 	reserved = calc_reserved(sdp);
-	old = atomic_read(&sdp->sd_log_blks_free);
-	atomic_add(tr->tr_reserved - (reserved - sdp->sd_log_blks_reserved),
-		   &sdp->sd_log_blks_free);
-
-	gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) >= old);
+	unused = sdp->sd_log_blks_reserved - reserved + tr->tr_reserved;
+	gfs2_assert_withdraw(sdp, unused >= 0);
+	atomic_add(unused, &sdp->sd_log_blks_free);
 	gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <=
 			     sdp->sd_jdesc->jd_blocks);
-
 	sdp->sd_log_blks_reserved = reserved;
 
 	gfs2_log_unlock(sdp);
-- 
1.5.1.2

[PATCH 51/58] [GFS2] Reduce inode size by moving i_alloc out of line

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

It is possible to reduce the size of GFS2 inodes by taking the i_alloc
structure out of the gfs2_inode. This patch allocates the i_alloc
structure whenever its needed, and frees it afterward. This decreases
the amount of low memory we use at the expense of requiring a memory
allocation for each page or partial page that we write. A quick test
with postmark shows that the overhead is not measurable and I also note
that OCFS2 use the same approach.

In the future I'd like to solve the problem by shrinking down the size
of the members of the i_alloc structure, but for now, this reduces the
immediate problem of using too much low-memory on x86 and doesn't add
too much overhead.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 2241141..73dfad7 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -683,7 +683,7 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
 	if (metadata)
 		revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs;
 
-	error = gfs2_rindex_hold(sdp, &ip->i_alloc.al_ri_gh);
+	error = gfs2_rindex_hold(sdp, &ip->i_alloc->al_ri_gh);
 	if (error)
 		return error;
 
@@ -785,7 +785,7 @@ out_rg_gunlock:
 out_rlist:
 	gfs2_rlist_free(&rlist);
 out:
-	gfs2_glock_dq_uninit(&ip->i_alloc.al_ri_gh);
+	gfs2_glock_dq_uninit(&ip->i_alloc->al_ri_gh);
 	return error;
 }
 
diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index 9949bb7..57e2ed9 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -1876,7 +1876,7 @@ static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
 	if (error)
 		goto out;
 
-	error = gfs2_rindex_hold(sdp, &dip->i_alloc.al_ri_gh);
+	error = gfs2_rindex_hold(sdp, &dip->i_alloc->al_ri_gh);
 	if (error)
 		goto out_qs;
 
@@ -1949,7 +1949,7 @@ out_rg_gunlock:
 	gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
 out_rlist:
 	gfs2_rlist_free(&rlist);
-	gfs2_glock_dq_uninit(&dip->i_alloc.al_ri_gh);
+	gfs2_glock_dq_uninit(&dip->i_alloc->al_ri_gh);
 out_qs:
 	gfs2_quota_unhold(dip);
 out:
diff --git a/fs/gfs2/eattr.c b/fs/gfs2/eattr.c
index 2a7435b..bee9970 100644
--- a/fs/gfs2/eattr.c
+++ b/fs/gfs2/eattr.c
@@ -1418,7 +1418,7 @@ out:
 static int ea_dealloc_block(struct gfs2_inode *ip)
 {
 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
-	struct gfs2_alloc *al = &ip->i_alloc;
+	struct gfs2_alloc *al = ip->i_alloc;
 	struct gfs2_rgrpd *rgd;
 	struct buffer_head *dibh;
 	int error;
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index c85f4fd..bd92a6d 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -264,7 +264,7 @@ struct gfs2_inode {
 	struct gfs2_glock *i_gl; /* Move into i_gh? */
 	struct gfs2_holder i_iopen_gh;
 	struct gfs2_holder i_gh; /* for prepare/commit_write only */
-	struct gfs2_alloc i_alloc;
+	struct gfs2_alloc *i_alloc;
 	u64 i_last_rg_alloc;
 
 	spinlock_t i_spin;
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 53bca99..c84764a 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -711,9 +711,10 @@ static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation)
 	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
 	int error;
 
-	gfs2_alloc_get(dip);
+	if (gfs2_alloc_get(dip) == NULL)
+		return -ENOMEM;
 
-	dip->i_alloc.al_requested = RES_DINODE;
+	dip->i_alloc->al_requested = RES_DINODE;
 	error = gfs2_inplace_reserve(dip);
 	if (error)
 		goto out;
@@ -900,7 +901,7 @@ fail_end_trans:
 	gfs2_trans_end(sdp);
 
 fail_ipreserv:
-	if (dip->i_alloc.al_rgd)
+	if (dip->i_alloc->al_rgd)
 		gfs2_inplace_release(dip);
 
 fail_quota_locks:
diff --git a/fs/gfs2/main.c b/fs/gfs2/main.c
index 653fd5a..88686fc 100644
--- a/fs/gfs2/main.c
+++ b/fs/gfs2/main.c
@@ -31,6 +31,7 @@ static void gfs2_init_inode_once(struct kmem_cache *cachep, void *foo)
 	inode_init_once(&ip->i_inode);
 	spin_lock_init(&ip->i_spin);
 	init_rwsem(&ip->i_rw_mutex);
+	ip->i_alloc = NULL;
 }
 
 static void gfs2_init_glock_once(struct kmem_cache *cachep, void *foo)
diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index 37406a3..38dbe99 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -646,7 +646,6 @@ static int gfs2_write_begin(struct file *file, struct address_space *mapping,
 	if (error)
 		goto out_unlock;
 
-	ip->i_alloc.al_requested = 0;
 	if (alloc_required) {
 		al = gfs2_alloc_get(ip);
 
@@ -823,7 +822,7 @@ static int gfs2_write_end(struct file *file, struct address_space *mapping,
 	struct gfs2_inode *ip = GFS2_I(inode);
 	struct gfs2_sbd *sdp = GFS2_SB(inode);
 	struct buffer_head *dibh;
-	struct gfs2_alloc *al = &ip->i_alloc;
+	struct gfs2_alloc *al = ip->i_alloc;
 	struct gfs2_dinode *di;
 	unsigned int from = pos & (PAGE_CACHE_SIZE - 1);
 	unsigned int to = from + len;
@@ -861,7 +860,7 @@ static int gfs2_write_end(struct file *file, struct address_space *mapping,
 	brelse(dibh);
 	gfs2_trans_end(sdp);
 failed:
-	if (al->al_requested) {
+	if (al) {
 		gfs2_inplace_release(ip);
 		gfs2_quota_unlock(ip);
 		gfs2_alloc_put(ip);
diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c
index 597f7ff..d7f4726 100644
--- a/fs/gfs2/ops_file.c
+++ b/fs/gfs2/ops_file.c
@@ -364,9 +364,11 @@ static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page)
 	ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required);
 	if (ret || !alloc_required)
 		goto out_unlock;
-
-	ip->i_alloc.al_requested = 0;
+	ret = -ENOMEM;
 	al = gfs2_alloc_get(ip);
+	if (al == NULL)
+		goto out_unlock;
+
 	ret = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
 	if (ret)
 		goto out_alloc_put;
diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
index 8386ab3..9f71372 100644
--- a/fs/gfs2/ops_inode.c
+++ b/fs/gfs2/ops_inode.c
@@ -61,7 +61,7 @@ static int gfs2_create(struct inode *dir, struct dentry *dentry,
 		inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0);
 		if (!IS_ERR(inode)) {
 			gfs2_trans_end(sdp);
-			if (dip->i_alloc.al_rgd)
+			if (dip->i_alloc->al_rgd)
 				gfs2_inplace_release(dip);
 			gfs2_quota_unlock(dip);
 			gfs2_alloc_put(dip);
@@ -376,7 +376,7 @@ static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
 	}
 
 	gfs2_trans_end(sdp);
-	if (dip->i_alloc.al_rgd)
+	if (dip->i_alloc->al_rgd)
 		gfs2_inplace_release(dip);
 	gfs2_quota_unlock(dip);
 	gfs2_alloc_put(dip);
@@ -452,7 +452,7 @@ static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 	gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
 
 	gfs2_trans_end(sdp);
-	if (dip->i_alloc.al_rgd)
+	if (dip->i_alloc->al_rgd)
 		gfs2_inplace_release(dip);
 	gfs2_quota_unlock(dip);
 	gfs2_alloc_put(dip);
@@ -558,7 +558,7 @@ static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
 	}
 
 	gfs2_trans_end(sdp);
-	if (dip->i_alloc.al_rgd)
+	if (dip->i_alloc->al_rgd)
 		gfs2_inplace_release(dip);
 	gfs2_quota_unlock(dip);
 	gfs2_alloc_put(dip);
diff --git a/fs/gfs2/quota.c b/fs/gfs2/quota.c
index 60cc50f..a08dabd 100644
--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -453,7 +453,7 @@ static void qdsb_put(struct gfs2_quota_data *qd)
 int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
 {
 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
-	struct gfs2_alloc *al = &ip->i_alloc;
+	struct gfs2_alloc *al = ip->i_alloc;
 	struct gfs2_quota_data **qd = al->al_qd;
 	int error;
 
@@ -501,7 +501,7 @@ out:
 void gfs2_quota_unhold(struct gfs2_inode *ip)
 {
 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
-	struct gfs2_alloc *al = &ip->i_alloc;
+	struct gfs2_alloc *al = ip->i_alloc;
 	unsigned int x;
 
 	gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
@@ -853,7 +853,7 @@ fail:
 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
 {
 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
-	struct gfs2_alloc *al = &ip->i_alloc;
+	struct gfs2_alloc *al = ip->i_alloc;
 	unsigned int x;
 	int error = 0;
 
@@ -921,7 +921,7 @@ static int need_sync(struct gfs2_quota_data *qd)
 
 void gfs2_quota_unlock(struct gfs2_inode *ip)
 {
-	struct gfs2_alloc *al = &ip->i_alloc;
+	struct gfs2_alloc *al = ip->i_alloc;
 	struct gfs2_quota_data *qda[4];
 	unsigned int count = 0;
 	unsigned int x;
@@ -969,7 +969,7 @@ static int print_message(struct gfs2_quota_data *qd, char *type)
 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
 {
 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
-	struct gfs2_alloc *al = &ip->i_alloc;
+	struct gfs2_alloc *al = ip->i_alloc;
 	struct gfs2_quota_data *qd;
 	s64 value;
 	unsigned int x;
@@ -1013,7 +1013,7 @@ int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
 		       u32 uid, u32 gid)
 {
-	struct gfs2_alloc *al = &ip->i_alloc;
+	struct gfs2_alloc *al = ip->i_alloc;
 	struct gfs2_quota_data *qd;
 	unsigned int x;
 
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 68c4bf3..3552110 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -819,11 +819,9 @@ void gfs2_rgrp_repolish_clones(struct gfs2_rgrpd *rgd)
 
 struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip)
 {
-	struct gfs2_alloc *al = &ip->i_alloc;
-
-	/* FIXME: Should assert that the correct locks are held here... */
-	memset(al, 0, sizeof(*al));
-	return al;
+	BUG_ON(ip->i_alloc != NULL);
+	ip->i_alloc = kzalloc(sizeof(struct gfs2_alloc), GFP_KERNEL);
+	return ip->i_alloc;
 }
 
 /**
@@ -1061,7 +1059,7 @@ static struct inode *get_local_rgrp(struct gfs2_inode *ip, u64 *last_unlinked)
 	struct inode *inode = NULL;
 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 	struct gfs2_rgrpd *rgd, *begin = NULL;
-	struct gfs2_alloc *al = &ip->i_alloc;
+	struct gfs2_alloc *al = ip->i_alloc;
 	int flags = LM_FLAG_TRY;
 	int skipped = 0;
 	int loops = 0;
@@ -1176,7 +1174,7 @@ out:
 int gfs2_inplace_reserve_i(struct gfs2_inode *ip, char *file, unsigned int line)
 {
 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
-	struct gfs2_alloc *al = &ip->i_alloc;
+	struct gfs2_alloc *al = ip->i_alloc;
 	struct inode *inode;
 	int error = 0;
 	u64 last_unlinked = NO_BLOCK;
@@ -1222,7 +1220,7 @@ try_again:
 void gfs2_inplace_release(struct gfs2_inode *ip)
 {
 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
-	struct gfs2_alloc *al = &ip->i_alloc;
+	struct gfs2_alloc *al = ip->i_alloc;
 
 	if (gfs2_assert_warn(sdp, al->al_alloced <= al->al_requested) == -1)
 		fs_warn(sdp, "al_alloced = %u, al_requested = %u "
@@ -1412,7 +1410,7 @@ static struct gfs2_rgrpd *rgblk_free(struct gfs2_sbd *sdp, u64 bstart,
 u64 gfs2_alloc_data(struct gfs2_inode *ip)
 {
 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
-	struct gfs2_alloc *al = &ip->i_alloc;
+	struct gfs2_alloc *al = ip->i_alloc;
 	struct gfs2_rgrpd *rgd = al->al_rgd;
 	u32 goal, blk;
 	u64 block;
@@ -1457,7 +1455,7 @@ u64 gfs2_alloc_data(struct gfs2_inode *ip)
 u64 gfs2_alloc_meta(struct gfs2_inode *ip)
 {
 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
-	struct gfs2_alloc *al = &ip->i_alloc;
+	struct gfs2_alloc *al = ip->i_alloc;
 	struct gfs2_rgrpd *rgd = al->al_rgd;
 	u32 goal, blk;
 	u64 block;
@@ -1503,7 +1501,7 @@ u64 gfs2_alloc_meta(struct gfs2_inode *ip)
 u64 gfs2_alloc_di(struct gfs2_inode *dip, u64 *generation)
 {
 	struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
-	struct gfs2_alloc *al = &dip->i_alloc;
+	struct gfs2_alloc *al = dip->i_alloc;
 	struct gfs2_rgrpd *rgd = al->al_rgd;
 	u32 blk;
 	u64 block;
diff --git a/fs/gfs2/rgrp.h b/fs/gfs2/rgrp.h
index b4c6adf..149bb16 100644
--- a/fs/gfs2/rgrp.h
+++ b/fs/gfs2/rgrp.h
@@ -32,7 +32,9 @@ void gfs2_rgrp_repolish_clones(struct gfs2_rgrpd *rgd);
 struct gfs2_alloc *gfs2_alloc_get(struct gfs2_inode *ip);
 static inline void gfs2_alloc_put(struct gfs2_inode *ip)
 {
-	return; /* So we can see where ip->i_alloc is used */
+	BUG_ON(ip->i_alloc == NULL);
+	kfree(ip->i_alloc);
+	ip->i_alloc = NULL;
 }
 
 int gfs2_inplace_reserve_i(struct gfs2_inode *ip,
-- 
1.5.1.2

[PATCH 52/58] [GFS2] Remove unneeded i_spin

[swhiteho]

From: Bob Peterson <rpeterso@redhat.com>

This patch removes a vestigial variable "i_spin" from the gfs2_inode
structure.  This not only saves us memory (>300000 of these in memory
for the oom test) it also saves us time because we don't have to
spend time initializing it (i.e. slightly better performance).

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index bd92a6d..1339996 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -267,7 +267,6 @@ struct gfs2_inode {
 	struct gfs2_alloc *i_alloc;
 	u64 i_last_rg_alloc;
 
-	spinlock_t i_spin;
 	struct rw_semaphore i_rw_mutex;
 };
 
diff --git a/fs/gfs2/main.c b/fs/gfs2/main.c
index 88686fc..9c7765c 100644
--- a/fs/gfs2/main.c
+++ b/fs/gfs2/main.c
@@ -29,7 +29,6 @@ static void gfs2_init_inode_once(struct kmem_cache *cachep, void *foo)
 	struct gfs2_inode *ip = foo;
 
 	inode_init_once(&ip->i_inode);
-	spin_lock_init(&ip->i_spin);
 	init_rwsem(&ip->i_rw_mutex);
 	ip->i_alloc = NULL;
 }
-- 
1.5.1.2

[PATCH 53/58] [GFS2] gfs2_alloc_required performance

[swhiteho]

From: Bob Peterson <rpeterso@redhat.com>

This is a small I/O performance enhancement to gfs2.  (Actually, it is a rework of
an earlier version I got wrong).  The idea here is to check if the write extends
past the last block in the file.  If so, the function can save itself a lot of
time and trouble because it knows an allocate will be required.  Benchmarks like
iozone should see better performance.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 73dfad7..4356cc2 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -1224,6 +1224,11 @@ int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
 		unsigned int shift = sdp->sd_sb.sb_bsize_shift;
 		lblock = offset >> shift;
 		lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift;
+		if (lblock_stop > ip->i_di.di_blocks) { /* writing past the
+							   last block */
+			*alloc_required = 1;
+			return 0;
+		}
 	}
 
 	for (; lblock < lblock_stop; lblock += extlen) {
-- 
1.5.1.2

[PATCH 54/58] [GFS2] Fix write alloc required shortcut calculation

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

The comparison was being made against the wrong quantity.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 4356cc2..e4effc4 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -1222,10 +1222,10 @@ int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
 		do_div(lblock_stop, bsize);
 	} else {
 		unsigned int shift = sdp->sd_sb.sb_bsize_shift;
+		u64 end_of_file = (ip->i_di.di_size + sdp->sd_sb.sb_bsize - 1) >> shift;
 		lblock = offset >> shift;
 		lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift;
-		if (lblock_stop > ip->i_di.di_blocks) { /* writing past the
-							   last block */
+		if (lblock_stop > end_of_file) {
 			*alloc_required = 1;
 			return 0;
 		}
-- 
1.5.1.2

[PATCH 55/58] [GFS2] Fix typo

[swhiteho]

From: Bob Peterson <rpeterso@redhat.com>

This patch fixes a minor typo.  Surprisingly, it still compiled.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index bc28bc6..99c7959 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -284,7 +284,7 @@ void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh,
 		return;
 	}
 
-	bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL),
+	bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL);
 	bd->bd_bh = bh;
 	bd->bd_gl = gl;
 
-- 
1.5.1.2

[PATCH 56/58] [GFS2] Fix page_mkwrite truncation race path

[swhiteho]

From: Steven Whitehouse <swhiteho@redhat.com>

There was a bug in the truncation/invalidation race path for
->page_mkwrite for gfs2. It ought to return 0 so that the effect is the
same as if the page was truncated at any of the other points at which
the page_lock is dropped. This will result in the restart of the whole
page fault path. If it was due to a real truncation (as opposed to an
invalidate because we let a glock go) then the ->fault path will pick
that up when it gets called again.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/ops_file.c b/fs/gfs2/ops_file.c
index d7f4726..f4842f2 100644
--- a/fs/gfs2/ops_file.c
+++ b/fs/gfs2/ops_file.c
@@ -394,6 +394,7 @@ static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page)
 	last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT;
 	if (page->index > last_index)
 		goto out_unlock_page;
+	ret = 0;
 	if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping)
 		goto out_unlock_page;
 	if (gfs2_is_stuffed(ip)) {
-- 
1.5.1.2

[PATCH 57/58] [GFS2] Lockup on error

[swhiteho]

From: Bob Peterson <rpeterso@redhat.com>

I spotted this bug while I was digging around.  Looks like it could cause
a lockup in some rare error condition.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index c84764a..728d316 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -860,7 +860,7 @@ static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
 
 	error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name);
 	if (alloc_required < 0)
-		goto fail;
+		goto fail_quota_locks;
 	if (alloc_required) {
 		error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
 		if (error)
-- 
1.5.1.2

[PATCH 58/58] [GFS2] Allow journal recovery on read-only mount

[swhiteho]

From: Abhijith Das <adas@redhat.com>

This patch allows gfs2 to perform journal recovery even if it is mounted
read-only. Strictly speaking, a read-only mount should not be writing to
the filesystem, but we do this only to perform journal recovery. A
read-only mount will fail if we don't recover the dirty journal. Also,
when gfs2 is used as a root filesystem, it will be mounted read-only
before being mounted read-write during the boot sequence. A failed
read-only mount will panic the machine during bootup.

Signed-off-by: Abhijith Das <adas@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/recovery.c b/fs/gfs2/recovery.c
index 27c994f..b249e29 100644
--- a/fs/gfs2/recovery.c
+++ b/fs/gfs2/recovery.c
@@ -504,13 +504,21 @@ int gfs2_recover_journal(struct gfs2_jdesc *jd)
 			if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
 				ro = 1;
 		} else {
-			if (sdp->sd_vfs->s_flags & MS_RDONLY)
-				ro = 1;
+			if (sdp->sd_vfs->s_flags & MS_RDONLY) {
+				/* check if device itself is read-only */
+				ro = bdev_read_only(sdp->sd_vfs->s_bdev);
+				if (!ro) {
+					fs_info(sdp, "recovery required on "
+						"read-only filesystem.\n");
+					fs_info(sdp, "write access will be "
+						"enabled during recovery.\n");
+				}
+			}
 		}
 
 		if (ro) {
-			fs_warn(sdp, "jid=%u: Can't replay: read-only FS\n",
-				jd->jd_jid);
+			fs_warn(sdp, "jid=%u: Can't replay: read-only block "
+				"device\n", jd->jd_jid);
 			error = -EROFS;
 			goto fail_gunlock_tr;
 		}
-- 
1.5.1.2

[GFS2] Pre-pull patch posting

[swhiteho]

This is the current content of the GFS2 -nmw git tree. Mostly bug
fixes, there are some changes relating to block mapping which are
working towards cleaning up this code and allowing more efficient
block mapping. There is a second part to that work which is not
included in this patch set - the plan is that it will be in the
next patch set and its currently undergoing testing.

There are a number of clean up patches in the series too. We have
been continuing the work of gradually reducing the fields in the
various ..._host structures with a view to eventually eliminating
them completely. They were introduced as a stop-gap measure to fix
the endianess annotation and the fields are now gradually being moved
to other structures (or eliminated).

Bob Peterson's new improved "bitfit" algorithm provides a nice
speed up when we are allocating blocks as well as cleaning up
that area of the code.

Steve.

[GFS2] Pre-pull patch posting

[swhiteho]

So, although the merge window isn't yet open, I'm guessing that its
probably not too far away, hence this posting of the contents of
the current GFS2 -nmw git tree.

This time the big news is locking changes, although having said that,
there are far fewer queued patches in total than I've had for previous
merge windows and I believe that this is an indication of the
growing maturity of GFS2.

The first patch in the series is really the main change and is
a big clean up of the core of the glocks, which are really the
core of GFS2 in a lot of ways. Further through the series is
a documentation patch, which explains the fine detail of how
glocks work and the assumptions made by the glock core when
calling the functions relating to individual glock types.

Other notable changes include merging the lock_nolock module
into the core of GFS2 since there is little point in retaining
it separately. There is a plan to do the same to lock_dlm as
well in the future (not the DLM itself obviously, just the
interface module thats part of GFS2).

Most of the remaing changes are bug fixes or futher optimisations
over the initial glock changes, plus one or two minor clean ups
along the way.

Steve.

[GFS2] Pre-pull patch posting

[swhiteho]

Hi,

So as the merge window draws closer, here is the current content of the
GFS2 git tree. The major item this time is patch 5 in the series. This
contians by far the majority of the changes, and the majority of those
changes are actually removal of code. The patch merges the lock_dlm
module (not the dlm itself, but GFS2's interface to the dlm) into
GFS2 itself. This means that a number of optimisations are then
possible in terms of merging strucutures resulting in a considerable
saving in memory.

Since that patch is so large (I'm afraid that it really doesn't make
any sense to split it up) its been in the -nmw git tree for the whole
period since the last merge window and has also been posted for review
on cluster-devel on a number of occasions before that. We've run a
number of tests on it as well in that period, so I believe that its
pretty stable now. It certainly makes the code a lot cleaner and
easier to follow in that area.

The remainder of the patches are mostly bug fixes, but there are one
or two other interesting features, those being:

 o GFS2 now supports the discard I/O requests for thin provisioning, etc
 o A new "demote a glock" interface is added to sysfs to help in
   testing GFS2
 o With a new mkfs.gfs2 which writes UUIDs, the UUID is now included
   in uevent messages (with older filesystems which don't have UUIDs,
   we just don't send that information)

The GFS2 tracing patches which I posted a little while back are not
included in this patch set. I think I can see what I need to do in
order to avoid patching blktrace now, so my plan is to look at those
patches again after this merge window, and when all the queued patches
for the tracing subsystem have been merged.

As always, please let us know if you spot any issues in the patches,

Steve.