[PATCH 22/51] [GFS2] Clean up invalidatepage/releasepage

swhiteho
2007-10-04T09:25:16Z

From: Steven Whitehouse <swhiteho@redhat.com>

This patch fixes some bugs relating to journaled data files by cleaning
up the gfs2_invalidatepage() and gfs2_releasepage() functions. We now
never block during gfs2_releasepage(), instead we always either release
or refuse to release depending on the status of the buffers.

This fixes Red Hat bugzillas #248969 and #252392.

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

diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 777ca46..88342e0 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -156,9 +156,11 @@ static void inode_go_sync(struct gfs2_glock *gl)
ip = NULL;

if (test_bit(GLF_DIRTY, &gl->gl_flags)) {
- if (ip)
+ 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);
if (ip) {
struct address_space *mapping = ip->i_inode.i_mapping;
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 00ab6c0..d0e6b42 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -229,8 +229,10 @@ static void gfs2_ail2_empty_one(struct gfs2_sbd *sdp, struct gfs2_ail *ai)
list_del(&bd->bd_ail_st_list);
list_del(&bd->bd_ail_gl_list);
atomic_dec(&bd->bd_gl->gl_ail_count);
- bh_ip = GFS2_I(bd->bd_bh->b_page->mapping->host);
- gfs2_meta_cache_flush(bh_ip);
+ if (bd->bd_bh->b_page->mapping) {
+ bh_ip = GFS2_I(bd->bd_bh->b_page->mapping->host);
+ gfs2_meta_cache_flush(bh_ip);
+ }
brelse(bd->bd_bh);
}
}
diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index 42a5f58..8407d1d 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -616,58 +616,13 @@ static sector_t gfs2_bmap(struct address_space *mapping, sector_t lblock)
return dblock;
}

-static void discard_buffer(struct gfs2_sbd *sdp, struct buffer_head *bh)
-{
- struct gfs2_bufdata *bd;
-
- gfs2_log_lock(sdp);
- bd = bh->b_private;
- if (bd) {
- bd->bd_bh = NULL;
- bh->b_private = NULL;
- if (!bd->bd_ail && list_empty(&bd->bd_le.le_list))
- kmem_cache_free(gfs2_bufdata_cachep, bd);
- }
- gfs2_log_unlock(sdp);
-
- lock_buffer(bh);
- clear_buffer_dirty(bh);
- bh->b_bdev = NULL;
- clear_buffer_mapped(bh);
- clear_buffer_req(bh);
- clear_buffer_new(bh);
- clear_buffer_delay(bh);
- unlock_buffer(bh);
-}
-
static void gfs2_invalidatepage(struct page *page, unsigned long offset)
{
- struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
- struct buffer_head *head, *bh, *next;
- unsigned int curr_off = 0;
-
BUG_ON(!PageLocked(page));
if (offset == 0)
ClearPageChecked(page);
- if (!page_has_buffers(page))
- return;

- bh = head = page_buffers(page);
- do {
- unsigned int next_off = curr_off + bh->b_size;
- next = bh->b_this_page;
-
- if (offset <= curr_off)
- discard_buffer(sdp, bh);
-
- curr_off = next_off;
- bh = next;
- } while (bh != head);
-
- if (!offset)
- try_to_release_page(page, 0);
-
- return;
+ block_invalidatepage(page, offset);
}

/**
@@ -736,59 +691,6 @@ out:
}

/**
- * stuck_releasepage - We're stuck in gfs2_releasepage(). Print stuff out.
- * @bh: the buffer we're stuck on
- *
- */
-
-static void stuck_releasepage(struct buffer_head *bh)
-{
- struct inode *inode = bh->b_page->mapping->host;
- struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
- struct gfs2_bufdata *bd = bh->b_private;
- struct gfs2_glock *gl;
-static unsigned limit = 0;
-
- if (limit > 3)
- return;
- limit++;
-
- fs_warn(sdp, "stuck in gfs2_releasepage() %p\n", inode);
- fs_warn(sdp, "blkno = %llu, bh->b_count = %d\n",
- (unsigned long long)bh->b_blocknr, atomic_read(&bh->b_count));
- fs_warn(sdp, "pinned = %u\n", buffer_pinned(bh));
- fs_warn(sdp, "bh->b_private = %s\n", (bd) ? "!NULL" : "NULL");
-
- if (!bd)
- return;
-
- gl = bd->bd_gl;
-
- fs_warn(sdp, "gl = (%u, %llu)\n",
- gl->gl_name.ln_type, (unsigned long long)gl->gl_name.ln_number);
-
- fs_warn(sdp, "bd_list_tr = %s, bd_le.le_list = %s\n",
- (list_empty(&bd->bd_list_tr)) ? "no" : "yes",
- (list_empty(&bd->bd_le.le_list)) ? "no" : "yes");
-
- if (gl->gl_ops == &gfs2_inode_glops) {
- struct gfs2_inode *ip = gl->gl_object;
- unsigned int x;
-
- if (!ip)
- return;
-
- fs_warn(sdp, "ip = %llu %llu\n",
- (unsigned long long)ip->i_no_formal_ino,
- (unsigned long long)ip->i_no_addr);
-
- for (x = 0; x < GFS2_MAX_META_HEIGHT; x++)
- fs_warn(sdp, "ip->i_cache[%u] = %s\n",
- x, (ip->i_cache[x]) ? "!NULL" : "NULL");
- }
-}
-
-/**
* gfs2_releasepage - free the metadata associated with a page
* @page: the page that's being released
* @gfp_mask: passed from Linux VFS, ignored by us
@@ -805,38 +707,31 @@ int gfs2_releasepage(struct page *page, gfp_t gfp_mask)
struct gfs2_sbd *sdp = aspace->i_sb->s_fs_info;
struct buffer_head *bh, *head;
struct gfs2_bufdata *bd;
- unsigned long t = jiffies + gfs2_tune_get(sdp, gt_stall_secs) * HZ;

if (!page_has_buffers(page))
goto out;

+ gfs2_log_lock(sdp);
head = bh = page_buffers(page);
do {
- while (atomic_read(&bh->b_count)) {
- if (!atomic_read(&aspace->i_writecount))
- return 0;
-
- if (!(gfp_mask & __GFP_WAIT))
- return 0;
-
- if (time_after_eq(jiffies, t)) {
- stuck_releasepage(bh);
- /* should we withdraw here? */
- return 0;
- }
-
- yield();
- }
-
+ if (atomic_read(&bh->b_count))
+ goto cannot_release;
+ bd = bh->b_private;
+ if (bd && bd->bd_ail)
+ goto cannot_release;
gfs2_assert_warn(sdp, !buffer_pinned(bh));
gfs2_assert_warn(sdp, !buffer_dirty(bh));
+ bh = bh->b_this_page;
+ } while(bh != head);
+ gfs2_log_unlock(sdp);

+ head = bh = page_buffers(page);
+ do {
gfs2_log_lock(sdp);
bd = bh->b_private;
if (bd) {
gfs2_assert_warn(sdp, bd->bd_bh == bh);
gfs2_assert_warn(sdp, list_empty(&bd->bd_list_tr));
- gfs2_assert_warn(sdp, !bd->bd_ail);
bd->bd_bh = NULL;
if (!list_empty(&bd->bd_le.le_list))
bd = NULL;
@@ -851,6 +746,9 @@ int gfs2_releasepage(struct page *page, gfp_t gfp_mask)

out:
return try_to_free_buffers(page);
+cannot_release:
+ gfs2_log_unlock(sdp);
+ return 0;
}

const struct address_space_operations gfs2_file_aops = {
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index c1c6672..9e0e9be 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -35,6 +35,7 @@
#include "super.h"
#include "sys.h"
#include "util.h"
+#include "log.h"

#define DO 0
#define UNDO 1
@@ -887,6 +888,7 @@ error:
static void gfs2_kill_sb(struct super_block *sb)
{
gfs2_delete_debugfs_file(sb->s_fs_info);
+ gfs2_meta_syncfs(sb->s_fs_info);
kill_block_super(sb);
}

--
1.5.1.2