[Cluster-devel] GFS2: Pre-pull patch posting (merge window)

[Cluster-devel] GFS2: Pre-pull patch posting (merge window)

[Steven Whitehouse]

Hi,

Not a huge amount this time... just four patches. This time we have a couple
of bug fixes, one relating to bad i_goal values which are now ignored (i_goal
is basically a hint so it is safe to so this) and another relating to the
saving of the dirent location during rename. There is one performance
improvement, which is an optimisation in rgblk_free so that multiple block
deallocations will now be more efficient, and one clean up patch to use
_RET_IP_ rather than writing it out longhand,

Steve.

[Cluster-devel] [PATCH 1/4] GFS2: fix bad inode i_goal values during block allocation

[Steven Whitehouse]

From: Abhi Das <adas@redhat.com>

This patch checks if i_goal is either zero or if doesn't exist
within any rgrp (i.e gfs2_blk2rgrpd() returns NULL). If so, it
assigns the ip->i_no_addr block as the i_goal.

There are two scenarios where a bad i_goal can result in a
-EBADSLT error.

1. Attempting to allocate to an existing inode:
Control reaches gfs2_inplace_reserve() and ip->i_goal is bad.
We need to fix i_goal here.

2. A new inode is created in a directory whose i_goal is hosed:
In this case, the parent dir's i_goal is copied onto the new
inode. Since the new inode is not yet created, the ip->i_no_addr
field is invalid and so, the fix in gfs2_inplace_reserve() as per
1) won't work in this scenario. We need to catch and fix it sooner
in the parent dir itself (gfs2_create_inode()), before it is
copied to the new inode.

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

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index fc8ac2e..9516f5c 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -672,6 +672,7 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
 	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 	gfs2_set_inode_blocks(inode, 1);
 	munge_mode_uid_gid(dip, inode);
+	check_and_update_goal(dip);
 	ip->i_goal = dip->i_goal;
 	ip->i_diskflags = 0;
 	ip->i_eattr = 0;
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index f4cb9c0..55ef72d 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -577,6 +577,13 @@ struct gfs2_rgrpd *gfs2_rgrpd_get_next(struct gfs2_rgrpd *rgd)
 	return rgd;
 }
 
+void check_and_update_goal(struct gfs2_inode *ip)
+{
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+	if (!ip->i_goal || gfs2_blk2rgrpd(sdp, ip->i_goal, 1) == NULL)
+		ip->i_goal = ip->i_no_addr;
+}
+
 void gfs2_free_clones(struct gfs2_rgrpd *rgd)
 {
 	int x;
@@ -1910,6 +1917,7 @@ int gfs2_inplace_reserve(struct gfs2_inode *ip, const struct gfs2_alloc_parms *a
 	} else if (ip->i_rgd && rgrp_contains_block(ip->i_rgd, ip->i_goal)) {
 		rs->rs_rbm.rgd = begin = ip->i_rgd;
 	} else {
+		check_and_update_goal(ip);
 		rs->rs_rbm.rgd = begin = gfs2_blk2rgrpd(sdp, ip->i_goal, 1);
 	}
 	if (S_ISDIR(ip->i_inode.i_mode) && (ap->aflags & GFS2_AF_ORLOV))
diff --git a/fs/gfs2/rgrp.h b/fs/gfs2/rgrp.h
index 463ab2e..5d8f085 100644
--- a/fs/gfs2/rgrp.h
+++ b/fs/gfs2/rgrp.h
@@ -80,4 +80,5 @@ static inline bool gfs2_rs_active(struct gfs2_blkreserv *rs)
 	return rs && !RB_EMPTY_NODE(&rs->rs_node);
 }
 
+extern void check_and_update_goal(struct gfs2_inode *ip);
 #endif /* __RGRP_DOT_H__ */
-- 
1.8.3.1

[Cluster-devel] [PATCH 2/4] GFS2: Make rename not save dirent location

[Steven Whitehouse]

From: Bob Peterson <rpeterso@redhat.com>

This patch fixes a regression in the patch "GFS2: Remember directory
insert point", commit 2b47dad866d04f14c328f888ba5406057b8c7d33.
The problem had to do with the rename function: The function found
space for the new dirent, and remembered that location. But then the
old dirent was removed, which often moved the eligible location for
the renamed dirent. Putting the new dirent at the saved location
caused file system corruption.

This patch adds a new "save_loc" variable to struct gfs2_diradd.
If 1, the dirent location is saved. If 0, the dirent location is not
saved and the buffer_head is released as per previous behavior.

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

diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index 1a349f9..5d4261f 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -2100,8 +2100,13 @@ int gfs2_diradd_alloc_required(struct inode *inode, const struct qstr *name,
 	}
 	if (IS_ERR(dent))
 		return PTR_ERR(dent);
-	da->bh = bh;
-	da->dent = dent;
+
+	if (da->save_loc) {
+		da->bh = bh;
+		da->dent = dent;
+	} else {
+		brelse(bh);
+	}
 	return 0;
 }
 
diff --git a/fs/gfs2/dir.h b/fs/gfs2/dir.h
index 126c65d..e1b309c 100644
--- a/fs/gfs2/dir.h
+++ b/fs/gfs2/dir.h
@@ -23,6 +23,7 @@ struct gfs2_diradd {
 	unsigned nr_blocks;
 	struct gfs2_dirent *dent;
 	struct buffer_head *bh;
+	int save_loc;
 };
 
 extern struct inode *gfs2_dir_search(struct inode *dir,
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 9516f5c..fcf42ea 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -600,7 +600,7 @@ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
 	int error, free_vfs_inode = 0;
 	u32 aflags = 0;
 	unsigned blocks = 1;
-	struct gfs2_diradd da = { .bh = NULL, };
+	struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
 
 	if (!name->len || name->len > GFS2_FNAMESIZE)
 		return -ENAMETOOLONG;
@@ -900,7 +900,7 @@ static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
 	struct gfs2_inode *ip = GFS2_I(inode);
 	struct gfs2_holder ghs[2];
 	struct buffer_head *dibh;
-	struct gfs2_diradd da = { .bh = NULL, };
+	struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
 	int error;
 
 	if (S_ISDIR(inode->i_mode))
@@ -1338,7 +1338,7 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
 	struct gfs2_rgrpd *nrgd;
 	unsigned int num_gh;
 	int dir_rename = 0;
-	struct gfs2_diradd da = { .nr_blocks = 0, };
+	struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
 	unsigned int x;
 	int error;
 
-- 
1.8.3.1

[Cluster-devel] [PATCH 3/4] GFS2: Use gfs2_rbm_incr in rgblk_free

[Steven Whitehouse]

From: Bob Peterson <rpeterso@redhat.com>

This patch speeds up GFS2 unlink operations by using function
gfs2_rbm_incr rather than continuously calculating the rbm.

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 55ef72d..7474c41 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -2097,7 +2097,7 @@ static struct gfs2_rgrpd *rgblk_free(struct gfs2_sbd *sdp, u64 bstart,
 				     u32 blen, unsigned char new_state)
 {
 	struct gfs2_rbm rbm;
-	struct gfs2_bitmap *bi;
+	struct gfs2_bitmap *bi, *bi_prev = NULL;
 
 	rbm.rgd = gfs2_blk2rgrpd(sdp, bstart, 1);
 	if (!rbm.rgd) {
@@ -2106,18 +2106,22 @@ static struct gfs2_rgrpd *rgblk_free(struct gfs2_sbd *sdp, u64 bstart,
 		return NULL;
 	}
 
+	gfs2_rbm_from_block(&rbm, bstart);
 	while (blen--) {
-		gfs2_rbm_from_block(&rbm, bstart);
 		bi = rbm_bi(&rbm);
-		bstart++;
-		if (!bi->bi_clone) {
-			bi->bi_clone = kmalloc(bi->bi_bh->b_size,
-					       GFP_NOFS | __GFP_NOFAIL);
-			memcpy(bi->bi_clone + bi->bi_offset,
-			       bi->bi_bh->b_data + bi->bi_offset, bi->bi_len);
+		if (bi != bi_prev) {
+			if (!bi->bi_clone) {
+				bi->bi_clone = kmalloc(bi->bi_bh->b_size,
+						      GFP_NOFS | __GFP_NOFAIL);
+				memcpy(bi->bi_clone + bi->bi_offset,
+				       bi->bi_bh->b_data + bi->bi_offset,
+				       bi->bi_len);
+			}
+			gfs2_trans_add_meta(rbm.rgd->rd_gl, bi->bi_bh);
+			bi_prev = bi;
 		}
-		gfs2_trans_add_meta(rbm.rgd->rd_gl, bi->bi_bh);
 		gfs2_setbit(&rbm, false, new_state);
+		gfs2_rbm_incr(&rbm);
 	}
 
 	return rbm.rgd;
-- 
1.8.3.1

[Cluster-devel] [PATCH 4/4] GFS2: use _RET_IP_ instead of (unsigned long)__builtin_return_address(0)

[Steven Whitehouse]

From: Fabian Frederick <fabf@skynet.be>

use macro definition

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 7f513b1..8f0c19d 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -811,7 +811,7 @@ void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
 {
 	INIT_LIST_HEAD(&gh->gh_list);
 	gh->gh_gl = gl;
-	gh->gh_ip = (unsigned long)__builtin_return_address(0);
+	gh->gh_ip = _RET_IP_;
 	gh->gh_owner_pid = get_pid(task_pid(current));
 	gh->gh_state = state;
 	gh->gh_flags = flags;
@@ -835,7 +835,7 @@ void gfs2_holder_reinit(unsigned int state, unsigned flags, struct gfs2_holder *
 	gh->gh_state = state;
 	gh->gh_flags = flags;
 	gh->gh_iflags = 0;
-	gh->gh_ip = (unsigned long)__builtin_return_address(0);
+	gh->gh_ip = _RET_IP_;
 	if (gh->gh_owner_pid)
 		put_pid(gh->gh_owner_pid);
 	gh->gh_owner_pid = get_pid(task_pid(current));
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 2ffc67d..1cc0bba 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -93,7 +93,7 @@ static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
          * tr->alloced is not set since the transaction structure is
          * on the stack */
 	tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
-	tr.tr_ip = (unsigned long)__builtin_return_address(0);
+	tr.tr_ip = _RET_IP_;
 	sb_start_intwrite(sdp->sd_vfs);
 	if (gfs2_log_reserve(sdp, tr.tr_reserved) < 0) {
 		sb_end_intwrite(sdp->sd_vfs);
diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c
index 0546ab4..42bfd336 100644
--- a/fs/gfs2/trans.c
+++ b/fs/gfs2/trans.c
@@ -44,7 +44,7 @@ int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
 	if (!tr)
 		return -ENOMEM;
 
-	tr->tr_ip = (unsigned long)__builtin_return_address(0);
+	tr->tr_ip = _RET_IP_;
 	tr->tr_blocks = blocks;
 	tr->tr_revokes = revokes;
 	tr->tr_reserved = 1;
-- 
1.8.3.1