[PATCHv6 0/9] kill unnecessary SB sync wake-ups + cleanups

[PATCHv6 0/9] kill unnecessary SB sync wake-ups + cleanups

[Artem Bityutskiy]

Hi,

here is v6 of my SB sync wakups killing patches, v5 may be found:
http://marc.info/?l=linux-fsdevel&m=127583599911620&w=2

This is more of a reminder re-send, I did not get any feed-back for
v5. Not much changes since v5:

1. Drop patches which fix race conditions for s_dirty changes WRT actual
   write-back - these things are independent and I am planning to go through
   that separately.
2. Add "Acked-by" to the btrfs patch.
3. Fold all per-fs patches which introduce SB accessors into one big patch.

Artem.

[PATCHv6 1/9] AFFS: clean up dirty flag usage

[Artem Bityutskiy]

From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

In 'affs_write_super()': remove ancient and wrong commented code,
remove unneeded 'clean' variable, so the function becomes a bit
cleaner and simpler.

In 'affs_remount(): remove unnecessary SB dirty flag changes.

Tested-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
---
 fs/affs/super.c |   19 +++++--------------
 1 files changed, 5 insertions(+), 14 deletions(-)

diff --git a/fs/affs/super.c b/fs/affs/super.c
index 16a3e47..8447451 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -61,20 +61,13 @@ affs_put_super(struct super_block *sb)
 static void
 affs_write_super(struct super_block *sb)
 {
-	int clean = 2;
-
 	lock_super(sb);
-	if (!(sb->s_flags & MS_RDONLY)) {
-		//	if (sbi->s_bitmap[i].bm_bh) {
-		//		if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) {
-		//			clean = 0;
-		affs_commit_super(sb, clean);
-		sb->s_dirt = !clean;	/* redo until bitmap synced */
-	} else
-		sb->s_dirt = 0;
+	if (!(sb->s_flags & MS_RDONLY))
+		affs_commit_super(sb, 2);
+	sb->s_dirt = 0;
 	unlock_super(sb);
 
-	pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean);
+	pr_debug("AFFS: write_super() at %lu, clean=2\n", get_seconds());
 }
 
 static int
@@ -554,9 +547,7 @@ affs_remount(struct super_block *sb, int *flags, char *data)
 		return 0;
 	}
 	if (*flags & MS_RDONLY) {
-		sb->s_dirt = 1;
-		while (sb->s_dirt)
-			affs_write_super(sb);
+		affs_write_super(sb);
 		affs_free_bitmap(sb);
 	} else
 		res = affs_init_bitmap(sb, flags);
-- 
1.7.0.1

[PATCHv6 2/9] AFFS: wait for sb synchronization when needed

[Artem Bityutskiy]

From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

AFFS does not ever wait for superblock synchronization in
->put_super(), ->write_super, and ->sync_fs().

However, it should wait for synchronization in ->put_super() because
it is about to be unmounted, in ->write_super() because this is
periodic SB synchronization performed from a separate kernel thread,
and in ->sync_fs() it should respect the 'wait' flag. This patch fixes
the situation.

Also, in ->put_super(), do not write the SB if it is not dirty.

Tested-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
---
 fs/affs/super.c |   12 +++++++-----
 1 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/fs/affs/super.c b/fs/affs/super.c
index 8447451..9f6fbee 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -26,7 +26,7 @@ static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
 static int affs_remount (struct super_block *sb, int *flags, char *data);
 
 static void
-affs_commit_super(struct super_block *sb, int clean)
+affs_commit_super(struct super_block *sb, int wait, int clean)
 {
 	struct affs_sb_info *sbi = AFFS_SB(sb);
 	struct buffer_head *bh = sbi->s_root_bh;
@@ -36,6 +36,8 @@ affs_commit_super(struct super_block *sb, int clean)
 	secs_to_datestamp(get_seconds(), &tail->disk_change);
 	affs_fix_checksum(sb, bh);
 	mark_buffer_dirty(bh);
+	if (wait)
+		sync_dirty_buffer(bh);
 }
 
 static void
@@ -46,8 +48,8 @@ affs_put_super(struct super_block *sb)
 
 	lock_kernel();
 
-	if (!(sb->s_flags & MS_RDONLY))
-		affs_commit_super(sb, 1);
+	if (!(sb->s_flags & MS_RDONLY) && sb->s_dirt)
+		affs_commit_super(sb, 1, 1);
 
 	kfree(sbi->s_prefix);
 	affs_free_bitmap(sb);
@@ -63,7 +65,7 @@ affs_write_super(struct super_block *sb)
 {
 	lock_super(sb);
 	if (!(sb->s_flags & MS_RDONLY))
-		affs_commit_super(sb, 2);
+		affs_commit_super(sb, 1, 2);
 	sb->s_dirt = 0;
 	unlock_super(sb);
 
@@ -74,7 +76,7 @@ static int
 affs_sync_fs(struct super_block *sb, int wait)
 {
 	lock_super(sb);
-	affs_commit_super(sb, 2);
+	affs_commit_super(sb, wait, 2);
 	sb->s_dirt = 0;
 	unlock_super(sb);
 	return 0;
-- 
1.7.0.1

[PATCHv6 3/9] BFS: clean up the superblock usage

[Artem Bityutskiy]

From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

BFS is a very simple FS and its superblocks contains only static
information and is never changed. However, the BFS code for some
misterious reasons marked its buffer head as dirty from time to
time, but nothing in that buffer was ever changed.

This patch removes all the BFS superblock manipulation, simply
because it is not needed. It removes:

1. The si_sbh filed from 'struct bfs_sb_info' because it is not
   needed. We only need to read the SB once on mount to get the
   start of data blocks and the FS size. After this, we can forget
   about the SB.
2. All instances of 'mark_buffer_dirty(sbh)' for BFS SB because
   it is never changed.
3. The '->sync_fs()' method because there is nothing to sync
   (inodes are synched by VFS).
4. The '->write_super()' method, again, because the SB is never
   changed.

Tested-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
---
 fs/bfs/bfs.h   |    1 -
 fs/bfs/file.c  |    3 ---
 fs/bfs/inode.c |   46 +++++++---------------------------------------
 3 files changed, 7 insertions(+), 43 deletions(-)

diff --git a/fs/bfs/bfs.h b/fs/bfs/bfs.h
index 7109e45..f7f87e2 100644
--- a/fs/bfs/bfs.h
+++ b/fs/bfs/bfs.h
@@ -17,7 +17,6 @@ struct bfs_sb_info {
 	unsigned long si_lf_eblk;
 	unsigned long si_lasti;
 	unsigned long *si_imap;
-	struct buffer_head *si_sbh;		/* buffer header w/superblock */
 	struct mutex bfs_lock;
 };
 
diff --git a/fs/bfs/file.c b/fs/bfs/file.c
index 8fc2e9c..eb67edd 100644
--- a/fs/bfs/file.c
+++ b/fs/bfs/file.c
@@ -70,7 +70,6 @@ static int bfs_get_block(struct inode *inode, sector_t block,
 	struct super_block *sb = inode->i_sb;
 	struct bfs_sb_info *info = BFS_SB(sb);
 	struct bfs_inode_info *bi = BFS_I(inode);
-	struct buffer_head *sbh = info->si_sbh;
 
 	phys = bi->i_sblock + block;
 	if (!create) {
@@ -112,7 +111,6 @@ static int bfs_get_block(struct inode *inode, sector_t block,
 		info->si_freeb -= phys - bi->i_eblock;
 		info->si_lf_eblk = bi->i_eblock = phys;
 		mark_inode_dirty(inode);
-		mark_buffer_dirty(sbh);
 		err = 0;
 		goto out;
 	}
@@ -147,7 +145,6 @@ static int bfs_get_block(struct inode *inode, sector_t block,
 	 */
 	info->si_freeb -= bi->i_eblock - bi->i_sblock + 1 - inode->i_blocks;
 	mark_inode_dirty(inode);
-	mark_buffer_dirty(sbh);
 	map_bh(bh_result, sb, phys);
 out:
 	mutex_unlock(&info->bfs_lock);
diff --git a/fs/bfs/inode.c b/fs/bfs/inode.c
index f22a7d3..fe152dd 100644
--- a/fs/bfs/inode.c
+++ b/fs/bfs/inode.c
@@ -31,7 +31,6 @@ MODULE_LICENSE("GPL");
 #define dprintf(x...)
 #endif
 
-static void bfs_write_super(struct super_block *s);
 void dump_imap(const char *prefix, struct super_block *s);
 
 struct inode *bfs_iget(struct super_block *sb, unsigned long ino)
@@ -209,34 +208,12 @@ static void bfs_delete_inode(struct inode *inode)
 	 * "last block of the last file" even if there is no
 	 * real file there, saves us 1 gap.
 	 */
-	if (info->si_lf_eblk == bi->i_eblock) {
+	if (info->si_lf_eblk == bi->i_eblock)
 		info->si_lf_eblk = bi->i_sblock - 1;
-		mark_buffer_dirty(info->si_sbh);
-	}
 	mutex_unlock(&info->bfs_lock);
 	clear_inode(inode);
 }
 
-static int bfs_sync_fs(struct super_block *sb, int wait)
-{
-	struct bfs_sb_info *info = BFS_SB(sb);
-
-	mutex_lock(&info->bfs_lock);
-	mark_buffer_dirty(info->si_sbh);
-	sb->s_dirt = 0;
-	mutex_unlock(&info->bfs_lock);
-
-	return 0;
-}
-
-static void bfs_write_super(struct super_block *sb)
-{
-	if (!(sb->s_flags & MS_RDONLY))
-		bfs_sync_fs(sb, 1);
-	else
-		sb->s_dirt = 0;
-}
-
 static void bfs_put_super(struct super_block *s)
 {
 	struct bfs_sb_info *info = BFS_SB(s);
@@ -246,10 +223,6 @@ static void bfs_put_super(struct super_block *s)
 
 	lock_kernel();
 
-	if (s->s_dirt)
-		bfs_write_super(s);
-
-	brelse(info->si_sbh);
 	mutex_destroy(&info->bfs_lock);
 	kfree(info->si_imap);
 	kfree(info);
@@ -321,8 +294,6 @@ static const struct super_operations bfs_sops = {
 	.write_inode	= bfs_write_inode,
 	.delete_inode	= bfs_delete_inode,
 	.put_super	= bfs_put_super,
-	.write_super	= bfs_write_super,
-	.sync_fs	= bfs_sync_fs,
 	.statfs		= bfs_statfs,
 };
 
@@ -349,7 +320,7 @@ void dump_imap(const char *prefix, struct super_block *s)
 
 static int bfs_fill_super(struct super_block *s, void *data, int silent)
 {
-	struct buffer_head *bh;
+	struct buffer_head *bh, *sbh;
 	struct bfs_super_block *bfs_sb;
 	struct inode *inode;
 	unsigned i, imap_len;
@@ -365,10 +336,10 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent)
 
 	sb_set_blocksize(s, BFS_BSIZE);
 
-	info->si_sbh = sb_bread(s, 0);
-	if (!info->si_sbh)
+	sbh = sb_bread(s, 0);
+	if (!sbh)
 		goto out;
-	bfs_sb = (struct bfs_super_block *)info->si_sbh->b_data;
+	bfs_sb = (struct bfs_super_block *)sbh->b_data;
 	if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
 		if (!silent)
 			printf("No BFS filesystem on %s (magic=%08x)\n", 
@@ -472,10 +443,7 @@ static int bfs_fill_super(struct super_block *s, void *data, int silent)
 			info->si_lf_eblk = eblock;
 	}
 	brelse(bh);
-	if (!(s->s_flags & MS_RDONLY)) {
-		mark_buffer_dirty(info->si_sbh);
-		s->s_dirt = 1;
-	} 
+	brelse(sbh);
 	dump_imap("read_super", s);
 	return 0;
 
@@ -485,7 +453,7 @@ out3:
 out2:
 	kfree(info->si_imap);
 out1:
-	brelse(info->si_sbh);
+	brelse(sbh);
 out:
 	mutex_destroy(&info->bfs_lock);
 	kfree(info);
-- 
1.7.0.1

[PATCHv6 4/9] btrfs: remove junk sb_dirt change

[Artem Bityutskiy]

From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

BTRFS does not define a '->write_super()' method, so it should
not mark its superblock as dirty. This looks like some left-over.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Acked-by: Chris Mason <chris.mason@oracle.com>
---
 fs/btrfs/inode.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 7f9e053..04916cd 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2938,7 +2938,6 @@ int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
 	dir->i_mtime = dir->i_ctime = CURRENT_TIME;
 	ret = btrfs_update_inode(trans, root, dir);
 	BUG_ON(ret);
-	dir->i_sb->s_dirt = 1;
 
 	btrfs_free_path(path);
 	return 0;
-- 
1.7.0.1

[PATCHv6 5/9] sysv: do not mark superblock dirty on mount

[Artem Bityutskiy]

From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

I did not find any docs about this file-system, and I have no possibility
to test my changes. Thus, this is untested.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
---
 fs/sysv/super.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/fs/sysv/super.c b/fs/sysv/super.c
index 5a903da..0e44a62 100644
--- a/fs/sysv/super.c
+++ b/fs/sysv/super.c
@@ -347,7 +347,6 @@ static int complete_read_super(struct super_block *sb, int silent, int size)
 		sb->s_flags |= MS_RDONLY;
 	if (sbi->s_truncate)
 		sb->s_root->d_op = &sysv_dentry_operations;
-	sb->s_dirt = 1;
 	return 1;
 }
 
-- 
1.7.0.1

[PATCHv6 6/9] sysv: do not mark superblock dirty on remount

[Artem Bityutskiy]

From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

No need to mark the superblock as dirty in sysv_remount, synchronize
it instead (only if mounting R/O).

I did not find any docs about this file-system, and I have no possibility
to test my changes. Thus, this is untested. I see other issues in sysv,
e.g., why sysv_sync_fs writes only in the FSTYPE_SYSV4 case? However,
it marks its SB bh's dirty for all types, and does not wait for them
ever. With zero docs I'm unable to fix this.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
---
 fs/sysv/inode.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/sysv/inode.c b/fs/sysv/inode.c
index d4a5380..661bab5 100644
--- a/fs/sysv/inode.c
+++ b/fs/sysv/inode.c
@@ -71,8 +71,8 @@ static int sysv_remount(struct super_block *sb, int *flags, char *data)
 	lock_super(sb);
 	if (sbi->s_forced_ro)
 		*flags |= MS_RDONLY;
-	if (!(*flags & MS_RDONLY))
-		sb->s_dirt = 1;
+	if (*flags & MS_RDONLY)
+		sysv_write_super(sb);
 	unlock_super(sb);
 	return 0;
 }
-- 
1.7.0.1

[PATCHv6 7/9] FS: convert all file-systems and VFS to new SB accessors.

[Artem Bityutskiy]

From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

Convert all file-systems and VFS to the new SB accessors.
IOW, just mechanically change:

sb->s_dirt = 1  to sb_mark_dirty(sb)
sb->s_dirt = 0  to sb_mark_clean(sb)
if (sb->s_dirt) to if (sb_is_dirty(sb))

This patch does not introduce any functional changes, just wraps
the 's_dirt'.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
---
 fs/affs/bitmap.c      |    4 ++--
 fs/affs/super.c       |    6 +++---
 fs/exofs/file.c       |    2 +-
 fs/exofs/inode.c      |    2 +-
 fs/exofs/super.c      |    6 +++---
 fs/ext2/balloc.c      |    4 ++--
 fs/ext2/ialloc.c      |    4 ++--
 fs/ext2/super.c       |    6 +++---
 fs/ext2/xattr.c       |    2 +-
 fs/ext4/balloc.c      |    2 +-
 fs/ext4/file.c        |    2 +-
 fs/ext4/ialloc.c      |    4 ++--
 fs/ext4/inode.c       |    2 +-
 fs/ext4/mballoc.c     |    4 ++--
 fs/ext4/resize.c      |    4 ++--
 fs/ext4/super.c       |    6 +++---
 fs/ext4/xattr.c       |    2 +-
 fs/fat/fatent.c       |    8 ++++----
 fs/fat/inode.c        |    8 ++++----
 fs/hfs/extent.c       |    2 +-
 fs/hfs/hfs_fs.h       |    2 +-
 fs/hfs/inode.c        |    6 +++---
 fs/hfs/super.c        |    6 +++---
 fs/hfsplus/bitmap.c   |    4 ++--
 fs/hfsplus/dir.c      |    2 +-
 fs/hfsplus/inode.c    |    6 +++---
 fs/hfsplus/super.c    |   16 ++++++++--------
 fs/jffs2/os-linux.h   |    2 +-
 fs/jffs2/super.c      |    4 ++--
 fs/reiserfs/journal.c |    6 +++---
 fs/reiserfs/resize.c  |    2 +-
 fs/reiserfs/super.c   |   10 +++++-----
 fs/super.c            |    4 ++--
 fs/sync.c             |    2 +-
 fs/sysv/inode.c       |    6 +++---
 fs/sysv/sysv.h        |    2 +-
 fs/udf/super.c        |    6 +++---
 fs/udf/udfdecl.h      |    2 +-
 fs/ufs/balloc.c       |    8 ++++----
 fs/ufs/ialloc.c       |    4 ++--
 fs/ufs/super.c        |   12 ++++++------
 41 files changed, 96 insertions(+), 96 deletions(-)

diff --git a/fs/affs/bitmap.c b/fs/affs/bitmap.c
index 3e26271..feee52e 100644
--- a/fs/affs/bitmap.c
+++ b/fs/affs/bitmap.c
@@ -103,7 +103,7 @@ affs_free_block(struct super_block *sb, u32 block)
 	*(__be32 *)bh->b_data = cpu_to_be32(tmp - mask);
 
 	mark_buffer_dirty(bh);
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 	bm->bm_free++;
 
 	mutex_unlock(&sbi->s_bmlock);
@@ -248,7 +248,7 @@ find_bit:
 	*(__be32 *)bh->b_data = cpu_to_be32(tmp + mask);
 
 	mark_buffer_dirty(bh);
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 
 	mutex_unlock(&sbi->s_bmlock);
 
diff --git a/fs/affs/super.c b/fs/affs/super.c
index 9f6fbee..a1e0f10 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -48,7 +48,7 @@ affs_put_super(struct super_block *sb)
 
 	lock_kernel();
 
-	if (!(sb->s_flags & MS_RDONLY) && sb->s_dirt)
+	if (!(sb->s_flags & MS_RDONLY) && sb_is_dirty(sb))
 		affs_commit_super(sb, 1, 1);
 
 	kfree(sbi->s_prefix);
@@ -66,7 +66,7 @@ affs_write_super(struct super_block *sb)
 	lock_super(sb);
 	if (!(sb->s_flags & MS_RDONLY))
 		affs_commit_super(sb, 1, 2);
-	sb->s_dirt = 0;
+	sb_mark_clean(sb);
 	unlock_super(sb);
 
 	pr_debug("AFFS: write_super() at %lu, clean=2\n", get_seconds());
@@ -77,7 +77,7 @@ affs_sync_fs(struct super_block *sb, int wait)
 {
 	lock_super(sb);
 	affs_commit_super(sb, wait, 2);
-	sb->s_dirt = 0;
+	sb_mark_clean(sb);
 	unlock_super(sb);
 	return 0;
 }
diff --git a/fs/exofs/file.c b/fs/exofs/file.c
index f9bfe2b..4b92c06 100644
--- a/fs/exofs/file.c
+++ b/fs/exofs/file.c
@@ -57,7 +57,7 @@ static int exofs_file_fsync(struct file *filp, int datasync)
 	/* This is a good place to write the sb */
 	/* TODO: Sechedule an sb-sync on create */
 	sb = inode->i_sb;
-	if (sb->s_dirt)
+	if (sb_is_dirty(sb))
 		exofs_sync_fs(sb, 1);
 
 	return ret;
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
index ccd0ce3..82d4a2a 100644
--- a/fs/exofs/inode.c
+++ b/fs/exofs/inode.c
@@ -1134,7 +1134,7 @@ struct inode *exofs_new_inode(struct inode *dir, int mode)
 
 	sbi = sb->s_fs_info;
 
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 	inode_init_owner(inode, dir, mode);
 	inode->i_ino = sbi->s_nextid++;
 	inode->i_blkbits = EXOFS_BLKSHIFT;
diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index 03149b9..74ccbdc 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -237,7 +237,7 @@ int exofs_sync_fs(struct super_block *sb, int wait)
 		EXOFS_ERR("%s: exofs_sbi_write failed.\n", __func__);
 		goto out;
 	}
-	sb->s_dirt = 0;
+	sb_mark_clean(sb);
 
 out:
 	EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret);
@@ -251,7 +251,7 @@ static void exofs_write_super(struct super_block *sb)
 	if (!(sb->s_flags & MS_RDONLY))
 		exofs_sync_fs(sb, 1);
 	else
-		sb->s_dirt = 0;
+		sb_mark_clean(sb);
 }
 
 static void _exofs_print_device(const char *msg, const char *dev_path,
@@ -286,7 +286,7 @@ static void exofs_put_super(struct super_block *sb)
 	int num_pend;
 	struct exofs_sb_info *sbi = sb->s_fs_info;
 
-	if (sb->s_dirt)
+	if (sb_is_dirty(sb))
 		exofs_write_super(sb);
 
 	/* make sure there are no pending commands */
diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
index e8766a3..13c2fd1 100644
--- a/fs/ext2/balloc.c
+++ b/fs/ext2/balloc.c
@@ -165,7 +165,7 @@ static void release_blocks(struct super_block *sb, int count)
 		struct ext2_sb_info *sbi = EXT2_SB(sb);
 
 		percpu_counter_add(&sbi->s_freeblocks_counter, count);
-		sb->s_dirt = 1;
+		sb_mark_dirty(sb);
 	}
 }
 
@@ -180,7 +180,7 @@ static void group_adjust_blocks(struct super_block *sb, int group_no,
 		free_blocks = le16_to_cpu(desc->bg_free_blocks_count);
 		desc->bg_free_blocks_count = cpu_to_le16(free_blocks + count);
 		spin_unlock(sb_bgl_lock(sbi, group_no));
-		sb->s_dirt = 1;
+		sb_mark_dirty(sb);
 		mark_buffer_dirty(bh);
 	}
 }
diff --git a/fs/ext2/ialloc.c b/fs/ext2/ialloc.c
index 938dbc7..5bb71a2 100644
--- a/fs/ext2/ialloc.c
+++ b/fs/ext2/ialloc.c
@@ -81,7 +81,7 @@ static void ext2_release_inode(struct super_block *sb, int group, int dir)
 	spin_unlock(sb_bgl_lock(EXT2_SB(sb), group));
 	if (dir)
 		percpu_counter_dec(&EXT2_SB(sb)->s_dirs_counter);
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 	mark_buffer_dirty(bh);
 }
 
@@ -547,7 +547,7 @@ got:
 	}
 	spin_unlock(sb_bgl_lock(sbi, group));
 
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 	mark_buffer_dirty(bh2);
 	if (test_opt(sb, GRPID)) {
 		inode->i_mode = mode;
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 7ff43f4..39eb5df 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -121,7 +121,7 @@ static void ext2_put_super (struct super_block * sb)
 
 	dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
 
-	if (sb->s_dirt)
+	if (sb_is_dirty(sb))
 		ext2_write_super(sb);
 
 	ext2_xattr_put_super(sb);
@@ -1155,7 +1155,7 @@ static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
 	mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
 	if (wait)
 		sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
-	sb->s_dirt = 0;
+	sb_mark_clean(sb);
 }
 
 /*
@@ -1189,7 +1189,7 @@ void ext2_write_super(struct super_block *sb)
 	if (!(sb->s_flags & MS_RDONLY))
 		ext2_sync_fs(sb, 1);
 	else
-		sb->s_dirt = 0;
+		sb_mark_clean(sb);
 }
 
 static int ext2_remount (struct super_block * sb, int * flags, char * data)
diff --git a/fs/ext2/xattr.c b/fs/ext2/xattr.c
index 7c39157..31f66b9 100644
--- a/fs/ext2/xattr.c
+++ b/fs/ext2/xattr.c
@@ -348,7 +348,7 @@ static void ext2_xattr_update_super_block(struct super_block *sb)
 	spin_lock(&EXT2_SB(sb)->s_lock);
 	EXT2_SET_COMPAT_FEATURE(sb, EXT2_FEATURE_COMPAT_EXT_ATTR);
 	spin_unlock(&EXT2_SB(sb)->s_lock);
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 	mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
 }
 
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 95b7594..4d23090 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -477,7 +477,7 @@ void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
 	ret = ext4_handle_dirty_metadata(handle, NULL, gd_bh);
 	if (!err)
 		err = ret;
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 
 error_return:
 	brelse(bitmap_bh);
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 5313ae4..42f2a8d 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -123,7 +123,7 @@ static int ext4_file_open(struct inode * inode, struct file * filp)
 		if (!IS_ERR(cp)) {
 			memcpy(sbi->s_es->s_last_mounted, cp,
 			       sizeof(sbi->s_es->s_last_mounted));
-			sb->s_dirt = 1;
+			sb_mark_dirty(sb);
 		}
 	}
 	return dquot_file_open(inode, filp);
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 25c4b31..bb0ffb1 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -279,7 +279,7 @@ out:
 		err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);
 		if (!fatal)
 			fatal = err;
-		sb->s_dirt = 1;
+		sb_mark_dirty(sb);
 	} else
 		ext4_error(sb, "bit already cleared for inode %lu", ino);
 
@@ -965,7 +965,7 @@ got:
 	percpu_counter_dec(&sbi->s_freeinodes_counter);
 	if (S_ISDIR(mode))
 		percpu_counter_inc(&sbi->s_dirs_counter);
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 
 	if (sbi->s_log_groups_per_flex) {
 		flex_group = ext4_flex_group(sbi, group);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 2ca4d82..5bd3709 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5307,7 +5307,7 @@ static int ext4_do_update_inode(handle_t *handle,
 			ext4_update_dynamic_rev(sb);
 			EXT4_SET_RO_COMPAT_FEATURE(sb,
 					EXT4_FEATURE_RO_COMPAT_LARGE_FILE);
-			sb->s_dirt = 1;
+			sb_mark_dirty(sb);
 			ext4_handle_sync(handle);
 			err = ext4_handle_dirty_metadata(handle, NULL,
 					EXT4_SB(sb)->s_sbh);
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 12b3bc0..cca55ff 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2812,7 +2812,7 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
 	err = ext4_handle_dirty_metadata(handle, NULL, gdp_bh);
 
 out_err:
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 	brelse(bitmap_bh);
 	return err;
 }
@@ -4680,7 +4680,7 @@ do_more:
 		put_bh(bitmap_bh);
 		goto do_more;
 	}
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 error_return:
 	if (freed)
 		dquot_free_block(inode, freed);
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 6df797e..0a90057 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -922,7 +922,7 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
 	}
 
 	ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh);
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 
 exit_journal:
 	mutex_unlock(&sbi->s_resize_lock);
@@ -1046,7 +1046,7 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
 	}
 	ext4_blocks_count_set(es, o_blocks_count + add);
 	ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh);
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 	mutex_unlock(&EXT4_SB(sb)->s_resize_lock);
 	ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count,
 		   o_blocks_count + add);
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 4e8983a..d1707a0 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -653,7 +653,7 @@ static void ext4_put_super(struct super_block *sb)
 
 	lock_super(sb);
 	lock_kernel();
-	if (sb->s_dirt)
+	if (sb_is_dirty(sb))
 		ext4_commit_super(sb, 1);
 
 	if (sbi->s_journal) {
@@ -2686,7 +2686,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 #else
 		es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
 #endif
-		sb->s_dirt = 1;
+		sb_mark_dirty(sb);
 	}
 
 	if (sbi->s_blocks_per_group > blocksize * 8) {
@@ -3392,7 +3392,7 @@ static int ext4_commit_super(struct super_block *sb, int sync)
 					&EXT4_SB(sb)->s_freeblocks_counter));
 	es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
 					&EXT4_SB(sb)->s_freeinodes_counter));
-	sb->s_dirt = 0;
+	sb_mark_clean(sb);
 	BUFFER_TRACE(sbh, "marking dirty");
 	mark_buffer_dirty(sbh);
 	if (sync) {
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 0433800..c539104 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -458,7 +458,7 @@ static void ext4_xattr_update_super_block(handle_t *handle,
 
 	if (ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh) == 0) {
 		EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_EXT_ATTR);
-		sb->s_dirt = 1;
+		sb_mark_dirty(sb);
 		ext4_handle_dirty_metadata(handle, NULL, EXT4_SB(sb)->s_sbh);
 	}
 }
diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c
index 81184d3..5853dca 100644
--- a/fs/fat/fatent.c
+++ b/fs/fat/fatent.c
@@ -498,7 +498,7 @@ int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster)
 				sbi->prev_free = entry;
 				if (sbi->free_clusters != -1)
 					sbi->free_clusters--;
-				sb->s_dirt = 1;
+				sb_mark_dirty(sb);
 
 				cluster[idx_clus] = entry;
 				idx_clus++;
@@ -520,7 +520,7 @@ int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster)
 	/* Couldn't allocate the free entries */
 	sbi->free_clusters = 0;
 	sbi->free_clus_valid = 1;
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 	err = -ENOSPC;
 
 out:
@@ -586,7 +586,7 @@ int fat_free_clusters(struct inode *inode, int cluster)
 		ops->ent_put(&fatent, FAT_ENT_FREE);
 		if (sbi->free_clusters != -1) {
 			sbi->free_clusters++;
-			sb->s_dirt = 1;
+			sb_mark_dirty(sb);
 		}
 
 		if (nr_bhs + fatent.nr_bhs > MAX_BUF_PER_PAGE) {
@@ -676,7 +676,7 @@ int fat_count_free_clusters(struct super_block *sb)
 	}
 	sbi->free_clusters = free;
 	sbi->free_clus_valid = 1;
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 	fatent_brelse(&fatent);
 out:
 	unlock_fat(sbi);
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index ec6a699..e6a107f 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -465,7 +465,7 @@ static void fat_clear_inode(struct inode *inode)
 static void fat_write_super(struct super_block *sb)
 {
 	lock_super(sb);
-	sb->s_dirt = 0;
+	sb_mark_clean(sb);
 
 	if (!(sb->s_flags & MS_RDONLY))
 		fat_clusters_flush(sb);
@@ -476,9 +476,9 @@ static int fat_sync_fs(struct super_block *sb, int wait)
 {
 	int err = 0;
 
-	if (sb->s_dirt) {
+	if (sb_is_dirty(sb)) {
 		lock_super(sb);
-		sb->s_dirt = 0;
+		sb_mark_clean(sb);
 		err = fat_clusters_flush(sb);
 		unlock_super(sb);
 	}
@@ -492,7 +492,7 @@ static void fat_put_super(struct super_block *sb)
 
 	lock_kernel();
 
-	if (sb->s_dirt)
+	if (sb_is_dirty(sb))
 		fat_write_super(sb);
 
 	iput(sbi->fat_inode);
diff --git a/fs/hfs/extent.c b/fs/hfs/extent.c
index 2c16316..b008ba8 100644
--- a/fs/hfs/extent.c
+++ b/fs/hfs/extent.c
@@ -432,7 +432,7 @@ out:
 		if (inode->i_ino < HFS_FIRSTUSER_CNID)
 			set_bit(HFS_FLG_ALT_MDB_DIRTY, &HFS_SB(sb)->flags);
 		set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
-		sb->s_dirt = 1;
+		sb_mark_dirty(sb);
 	}
 	return res;
 
diff --git a/fs/hfs/hfs_fs.h b/fs/hfs/hfs_fs.h
index fe35e3b..99b5866 100644
--- a/fs/hfs/hfs_fs.h
+++ b/fs/hfs/hfs_fs.h
@@ -251,7 +251,7 @@ static inline const char *hfs_mdb_name(struct super_block *sb)
 static inline void hfs_bitmap_dirty(struct super_block *sb)
 {
 	set_bit(HFS_FLG_BITMAP_DIRTY, &HFS_SB(sb)->flags);
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 }
 
 static inline void hfs_buffer_sync(struct buffer_head *bh)
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index 87de671..dc60390 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -222,7 +222,7 @@ struct inode *hfs_new_inode(struct inode *dir, struct qstr *name, int mode)
 	insert_inode_hash(inode);
 	mark_inode_dirty(inode);
 	set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 
 	return inode;
 }
@@ -237,7 +237,7 @@ void hfs_delete_inode(struct inode *inode)
 		if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
 			HFS_SB(sb)->root_dirs--;
 		set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
-		sb->s_dirt = 1;
+		sb_mark_dirty(sb);
 		return;
 	}
 	HFS_SB(sb)->file_count--;
@@ -250,7 +250,7 @@ void hfs_delete_inode(struct inode *inode)
 		}
 	}
 	set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 }
 
 void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
diff --git a/fs/hfs/super.c b/fs/hfs/super.c
index 0a81eb7..bf71f6f 100644
--- a/fs/hfs/super.c
+++ b/fs/hfs/super.c
@@ -52,7 +52,7 @@ MODULE_LICENSE("GPL");
 static void hfs_write_super(struct super_block *sb)
 {
 	lock_super(sb);
-	sb->s_dirt = 0;
+	sb_mark_clean(sb);
 
 	/* sync everything to the buffers */
 	if (!(sb->s_flags & MS_RDONLY))
@@ -64,7 +64,7 @@ static int hfs_sync_fs(struct super_block *sb, int wait)
 {
 	lock_super(sb);
 	hfs_mdb_commit(sb);
-	sb->s_dirt = 0;
+	sb_mark_clean(sb);
 	unlock_super(sb);
 
 	return 0;
@@ -81,7 +81,7 @@ static void hfs_put_super(struct super_block *sb)
 {
 	lock_kernel();
 
-	if (sb->s_dirt)
+	if (sb_is_dirty(sb))
 		hfs_write_super(sb);
 	hfs_mdb_close(sb);
 	/* release the MDB's resources */
diff --git a/fs/hfsplus/bitmap.c b/fs/hfsplus/bitmap.c
index ea30afc..81e10c3 100644
--- a/fs/hfsplus/bitmap.c
+++ b/fs/hfsplus/bitmap.c
@@ -151,7 +151,7 @@ done:
 	kunmap(page);
 	*max = offset + (curr - pptr) * 32 + i - start;
 	HFSPLUS_SB(sb).free_blocks -= *max;
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 	dprint(DBG_BITMAP, "-> %u,%u\n", start, *max);
 out:
 	mutex_unlock(&HFSPLUS_SB(sb).alloc_file->i_mutex);
@@ -225,7 +225,7 @@ out:
 	set_page_dirty(page);
 	kunmap(page);
 	HFSPLUS_SB(sb).free_blocks += len;
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 	mutex_unlock(&HFSPLUS_SB(sb).alloc_file->i_mutex);
 
 	return 0;
diff --git a/fs/hfsplus/dir.c b/fs/hfsplus/dir.c
index 764fd1b..a572b02 100644
--- a/fs/hfsplus/dir.c
+++ b/fs/hfsplus/dir.c
@@ -305,7 +305,7 @@ static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir,
 	inode->i_ctime = CURRENT_TIME_SEC;
 	mark_inode_dirty(inode);
 	HFSPLUS_SB(sb).file_count++;
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 
 	return 0;
 }
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index 654c5a8..0fc15d8 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -379,7 +379,7 @@ struct inode *hfsplus_new_inode(struct super_block *sb, int mode)
 		HFSPLUS_SB(sb).file_count++;
 	insert_inode_hash(inode);
 	mark_inode_dirty(inode);
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 
 	return inode;
 }
@@ -390,7 +390,7 @@ void hfsplus_delete_inode(struct inode *inode)
 
 	if (S_ISDIR(inode->i_mode)) {
 		HFSPLUS_SB(sb).folder_count--;
-		sb->s_dirt = 1;
+		sb_mark_dirty(sb);
 		return;
 	}
 	HFSPLUS_SB(sb).file_count--;
@@ -403,7 +403,7 @@ void hfsplus_delete_inode(struct inode *inode)
 		inode->i_size = 0;
 		hfsplus_file_truncate(inode);
 	}
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 }
 
 void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index 74b473a..a90fc67 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -106,7 +106,7 @@ static int hfsplus_write_inode(struct inode *inode,
 	case HFSPLUS_EXT_CNID:
 		if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
 			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
-			inode->i_sb->s_dirt = 1;
+			sb_mark_dirty(inode->i_sb);
 		}
 		hfsplus_inode_write_fork(inode, &vhdr->ext_file);
 		hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
@@ -114,7 +114,7 @@ static int hfsplus_write_inode(struct inode *inode,
 	case HFSPLUS_CAT_CNID:
 		if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
 			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
-			inode->i_sb->s_dirt = 1;
+			sb_mark_dirty(inode->i_sb);
 		}
 		hfsplus_inode_write_fork(inode, &vhdr->cat_file);
 		hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
@@ -122,21 +122,21 @@ static int hfsplus_write_inode(struct inode *inode,
 	case HFSPLUS_ALLOC_CNID:
 		if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
 			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
-			inode->i_sb->s_dirt = 1;
+			sb_mark_dirty(inode->i_sb);
 		}
 		hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
 		break;
 	case HFSPLUS_START_CNID:
 		if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
 			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
-			inode->i_sb->s_dirt = 1;
+			sb_mark_dirty(inode->i_sb);
 		}
 		hfsplus_inode_write_fork(inode, &vhdr->start_file);
 		break;
 	case HFSPLUS_ATTR_CNID:
 		if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
 			HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
-			inode->i_sb->s_dirt = 1;
+			sb_mark_dirty(inode->i_sb);
 		}
 		hfsplus_inode_write_fork(inode, &vhdr->attr_file);
 		hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
@@ -161,7 +161,7 @@ static int hfsplus_sync_fs(struct super_block *sb, int wait)
 	dprint(DBG_SUPER, "hfsplus_write_super\n");
 
 	lock_super(sb);
-	sb->s_dirt = 0;
+	sb_mark_clean(sb);
 
 	vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
 	vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
@@ -202,7 +202,7 @@ static void hfsplus_write_super(struct super_block *sb)
 	if (!(sb->s_flags & MS_RDONLY))
 		hfsplus_sync_fs(sb, 1);
 	else
-		sb->s_dirt = 0;
+		sb_mark_clean(sb);
 }
 
 static void hfsplus_put_super(struct super_block *sb)
@@ -213,7 +213,7 @@ static void hfsplus_put_super(struct super_block *sb)
 
 	lock_kernel();
 
-	if (sb->s_dirt)
+	if (sb_is_dirty(sb))
 		hfsplus_write_super(sb);
 	if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
 		struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
diff --git a/fs/jffs2/os-linux.h b/fs/jffs2/os-linux.h
index 4791aac..b1cdf3b 100644
--- a/fs/jffs2/os-linux.h
+++ b/fs/jffs2/os-linux.h
@@ -142,7 +142,7 @@ void jffs2_nor_wbuf_flash_cleanup(struct jffs2_sb_info *c);
 
 static inline void jffs2_dirty_trigger(struct jffs2_sb_info *c)
 {
-	OFNI_BS_2SFFJ(c)->s_dirt = 1;
+	sb_mark_dirty(OFNI_BS_2SFFJ(c));
 }
 
 /* background.c */
diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
index 511e2d6..c328018 100644
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -59,7 +59,7 @@ static void jffs2_write_super(struct super_block *sb)
 	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
 
 	lock_super(sb);
-	sb->s_dirt = 0;
+	sb_mark_clean(sb);
 
 	if (!(sb->s_flags & MS_RDONLY)) {
 		D1(printk(KERN_DEBUG "jffs2_write_super()\n"));
@@ -194,7 +194,7 @@ static void jffs2_put_super (struct super_block *sb)
 
 	lock_kernel();
 
-	if (sb->s_dirt)
+	if (sb_is_dirty(sb))
 		jffs2_write_super(sb);
 
 	mutex_lock(&c->alloc_sem);
diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
index 19fbc81..8cfb26d 100644
--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -3337,7 +3337,7 @@ int journal_mark_dirty(struct reiserfs_transaction_handle *th,
 			       th->t_trans_id, journal->j_trans_id);
 	}
 
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 
 	prepared = test_clear_buffer_journal_prepared(bh);
 	clear_buffer_journal_restore_dirty(bh);
@@ -3632,7 +3632,7 @@ int reiserfs_flush_old_commits(struct super_block *sb)
 			do_journal_end(&th, sb, 1, COMMIT_NOW | WAIT);
 		}
 	}
-	return sb->s_dirt;
+	return sb_is_dirty(sb);
 }
 
 /*
@@ -4062,7 +4062,7 @@ static int do_journal_end(struct reiserfs_transaction_handle *th,
 	 ** it tells us if we should continue with the journal_end, or just return
 	 */
 	if (!check_journal_end(th, sb, nblocks, flags)) {
-		sb->s_dirt = 1;
+		sb_mark_dirty(sb);
 		wake_queued_writers(sb);
 		reiserfs_async_progress_wait(sb);
 		goto out;
diff --git a/fs/reiserfs/resize.c b/fs/reiserfs/resize.c
index b3a94d2..9e3caf5 100644
--- a/fs/reiserfs/resize.c
+++ b/fs/reiserfs/resize.c
@@ -203,7 +203,7 @@ int reiserfs_resize(struct super_block *s, unsigned long block_count_new)
 					  (bmap_nr_new - bmap_nr)));
 	PUT_SB_BLOCK_COUNT(s, block_count_new);
 	PUT_SB_BMAP_NR(s, bmap_would_wrap(bmap_nr_new) ? : bmap_nr_new);
-	s->s_dirt = 1;
+	sb_mark_dirty(s);
 
 	journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
 
diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index 9822fa1..d62a75f 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -71,8 +71,8 @@ static int reiserfs_sync_fs(struct super_block *s, int wait)
 	if (!journal_begin(&th, s, 1))
 		if (!journal_end_sync(&th, s, 1))
 			reiserfs_flush_old_commits(s);
-	s->s_dirt = 0;	/* Even if it's not true.
-			 * We'll loop forever in sync_supers otherwise */
+	sb_mark_clean(s); /* Even if it's not true.
+			   * We'll loop forever in sync_supers otherwise */
 	reiserfs_write_unlock(s);
 	return 0;
 }
@@ -98,7 +98,7 @@ static int reiserfs_freeze(struct super_block *s)
 			journal_end_sync(&th, s, 1);
 		}
 	}
-	s->s_dirt = 0;
+	sb_mark_clean(s);
 	reiserfs_write_unlock(s);
 	return 0;
 }
@@ -478,7 +478,7 @@ static void reiserfs_put_super(struct super_block *s)
 
 	reiserfs_write_lock(s);
 
-	if (s->s_dirt)
+	if (sb_is_dirty(s))
 		reiserfs_write_super(s);
 
 	/* change file system state to current state if it was mounted with read-write permissions */
@@ -1307,7 +1307,7 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
 	err = journal_end(&th, s, 10);
 	if (err)
 		goto out_err;
-	s->s_dirt = 0;
+	sb_mark_clean(s);
 
 	if (!(*mount_flags & MS_RDONLY)) {
 		dquot_resume(s, -1);
diff --git a/fs/super.c b/fs/super.c
index 5c35bc7..76b13c6 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -364,12 +364,12 @@ void sync_supers(void)
 	list_for_each_entry_safe(sb, n, &super_blocks, s_list) {
 		if (list_empty(&sb->s_instances))
 			continue;
-		if (sb->s_op->write_super && sb->s_dirt) {
+		if (sb->s_op->write_super && sb_is_dirty(sb)) {
 			sb->s_count++;
 			spin_unlock(&sb_lock);
 
 			down_read(&sb->s_umount);
-			if (sb->s_root && sb->s_dirt)
+			if (sb->s_root && sb_is_dirty(sb))
 				sb->s_op->write_super(sb);
 			up_read(&sb->s_umount);
 
diff --git a/fs/sync.c b/fs/sync.c
index 15aa6f0..fffcd71 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -142,7 +142,7 @@ int file_fsync(struct file *filp, int datasync)
 
 	/* sync the superblock to buffers */
 	sb = inode->i_sb;
-	if (sb->s_dirt && sb->s_op->write_super)
+	if (sb_is_dirty(sb) && sb->s_op->write_super)
 		sb->s_op->write_super(sb);
 
 	/* .. finally sync the buffers to disk */
diff --git a/fs/sysv/inode.c b/fs/sysv/inode.c
index 661bab5..41477f7 100644
--- a/fs/sysv/inode.c
+++ b/fs/sysv/inode.c
@@ -43,7 +43,7 @@ static int sysv_sync_fs(struct super_block *sb, int wait)
 	 * then attach current time stamp.
 	 * But if the filesystem was marked clean, keep it clean.
 	 */
-	sb->s_dirt = 0;
+	sb_mark_clean(sb);
 	old_time = fs32_to_cpu(sbi, *sbi->s_sb_time);
 	if (sbi->s_type == FSTYPE_SYSV4) {
 		if (*sbi->s_sb_state == cpu_to_fs32(sbi, 0x7c269d38 - old_time))
@@ -62,7 +62,7 @@ static void sysv_write_super(struct super_block *sb)
 	if (!(sb->s_flags & MS_RDONLY))
 		sysv_sync_fs(sb, 1);
 	else
-		sb->s_dirt = 0;
+		sb_mark_clean(sb);
 }
 
 static int sysv_remount(struct super_block *sb, int *flags, char *data)
@@ -81,7 +81,7 @@ static void sysv_put_super(struct super_block *sb)
 {
 	struct sysv_sb_info *sbi = SYSV_SB(sb);
 
-	if (sb->s_dirt)
+	if (sb_is_dirty(sb))
 		sysv_write_super(sb);
 
 	if (!(sb->s_flags & MS_RDONLY)) {
diff --git a/fs/sysv/sysv.h b/fs/sysv/sysv.h
index bb55cdb..232b4db 100644
--- a/fs/sysv/sysv.h
+++ b/fs/sysv/sysv.h
@@ -118,7 +118,7 @@ static inline void dirty_sb(struct super_block *sb)
 	mark_buffer_dirty(sbi->s_bh1);
 	if (sbi->s_bh1 != sbi->s_bh2)
 		mark_buffer_dirty(sbi->s_bh2);
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 }
 
 
diff --git a/fs/udf/super.c b/fs/udf/super.c
index 612d1e2..e213ca4 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -1941,7 +1941,7 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
 	sb->s_op = &udf_sb_ops;
 	sb->s_export_op = &udf_export_ops;
 
-	sb->s_dirt = 0;
+	sb_mark_clean(sb);
 	sb->s_magic = UDF_SUPER_MAGIC;
 	sb->s_time_gran = 1000;
 
@@ -2068,7 +2068,7 @@ static void udf_error(struct super_block *sb, const char *function,
 
 	if (!(sb->s_flags & MS_RDONLY)) {
 		/* mark sb error */
-		sb->s_dirt = 1;
+		sb_mark_dirty(sb);
 	}
 	va_start(args, fmt);
 	vsnprintf(error_buf, sizeof(error_buf), fmt, args);
@@ -2128,7 +2128,7 @@ static int udf_sync_fs(struct super_block *sb, int wait)
 		 * the buffer for IO
 		 */
 		mark_buffer_dirty(sbi->s_lvid_bh);
-		sb->s_dirt = 0;
+		sb_mark_clean(sb);
 		sbi->s_lvid_dirty = 0;
 	}
 	mutex_unlock(&sbi->s_alloc_mutex);
diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h
index 2bac035..d60cd33 100644
--- a/fs/udf/udfdecl.h
+++ b/fs/udf/udfdecl.h
@@ -120,7 +120,7 @@ static inline void udf_updated_lvid(struct super_block *sb)
 	WARN_ON_ONCE(((struct logicalVolIntegrityDesc *)
 		     bh->b_data)->integrityType !=
 		     cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN));
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 	UDF_SB(sb)->s_lvid_dirty = 1;
 }
 
diff --git a/fs/ufs/balloc.c b/fs/ufs/balloc.c
index 048484f..47462e1 100644
--- a/fs/ufs/balloc.c
+++ b/fs/ufs/balloc.c
@@ -118,7 +118,7 @@ void ufs_free_fragments(struct inode *inode, u64 fragment, unsigned count)
 		ubh_ll_rw_block(SWRITE, UCPI_UBH(ucpi));
 		ubh_wait_on_buffer (UCPI_UBH(ucpi));
 	}
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 	
 	unlock_super (sb);
 	UFSD("EXIT\n");
@@ -218,7 +218,7 @@ do_more:
 		goto do_more;
 	}
 
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 	unlock_super (sb);
 	UFSD("EXIT\n");
 	return;
@@ -562,7 +562,7 @@ static u64 ufs_add_fragments(struct inode *inode, u64 fragment,
 		ubh_ll_rw_block(SWRITE, UCPI_UBH(ucpi));
 		ubh_wait_on_buffer (UCPI_UBH(ucpi));
 	}
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 
 	UFSD("EXIT, fragment %llu\n", (unsigned long long)fragment);
 	
@@ -684,7 +684,7 @@ succed:
 		ubh_ll_rw_block(SWRITE, UCPI_UBH(ucpi));
 		ubh_wait_on_buffer (UCPI_UBH(ucpi));
 	}
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 
 	result += cgno * uspi->s_fpg;
 	UFSD("EXIT3, result %llu\n", (unsigned long long)result);
diff --git a/fs/ufs/ialloc.c b/fs/ufs/ialloc.c
index 594480e..54a2e1a 100644
--- a/fs/ufs/ialloc.c
+++ b/fs/ufs/ialloc.c
@@ -120,7 +120,7 @@ void ufs_free_inode (struct inode * inode)
 		ubh_wait_on_buffer (UCPI_UBH(ucpi));
 	}
 	
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 	unlock_super (sb);
 	UFSD("EXIT\n");
 }
@@ -296,7 +296,7 @@ cg_found:
 		ubh_ll_rw_block(SWRITE, UCPI_UBH(ucpi));
 		ubh_wait_on_buffer (UCPI_UBH(ucpi));
 	}
-	sb->s_dirt = 1;
+	sb_mark_dirty(sb);
 
 	inode->i_ino = cg * uspi->s_ipg + bit;
 	inode_init_owner(inode, dir, mode);
diff --git a/fs/ufs/super.c b/fs/ufs/super.c
index 3ec5a9e..8554ded 100644
--- a/fs/ufs/super.c
+++ b/fs/ufs/super.c
@@ -287,7 +287,7 @@ void ufs_error (struct super_block * sb, const char * function,
 	if (!(sb->s_flags & MS_RDONLY)) {
 		usb1->fs_clean = UFS_FSBAD;
 		ubh_mark_buffer_dirty(USPI_UBH(uspi));
-		sb->s_dirt = 1;
+		sb_mark_dirty(sb);
 		sb->s_flags |= MS_RDONLY;
 	}
 	va_start (args, fmt);
@@ -320,7 +320,7 @@ void ufs_panic (struct super_block * sb, const char * function,
 	if (!(sb->s_flags & MS_RDONLY)) {
 		usb1->fs_clean = UFS_FSBAD;
 		ubh_mark_buffer_dirty(USPI_UBH(uspi));
-		sb->s_dirt = 1;
+		sb_mark_dirty(sb);
 	}
 	va_start (args, fmt);
 	vsnprintf (error_buf, sizeof(error_buf), fmt, args);
@@ -1205,7 +1205,7 @@ static int ufs_sync_fs(struct super_block *sb, int wait)
 		ufs_set_fs_state(sb, usb1, usb3,
 				UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time));
 	ufs_put_cstotal(sb);
-	sb->s_dirt = 0;
+	sb_mark_clean(sb);
 
 	UFSD("EXIT\n");
 	unlock_kernel();
@@ -1219,7 +1219,7 @@ static void ufs_write_super(struct super_block *sb)
 	if (!(sb->s_flags & MS_RDONLY))
 		ufs_sync_fs(sb, 1);
 	else
-		sb->s_dirt = 0;
+		sb_mark_clean(sb);
 }
 
 static void ufs_put_super(struct super_block *sb)
@@ -1228,7 +1228,7 @@ static void ufs_put_super(struct super_block *sb)
 		
 	UFSD("ENTER\n");
 
-	if (sb->s_dirt)
+	if (sb_is_dirty(sb))
 		ufs_write_super(sb);
 
 	if (!(sb->s_flags & MS_RDONLY))
@@ -1298,7 +1298,7 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
 			ufs_set_fs_state(sb, usb1, usb3,
 				UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time));
 		ubh_mark_buffer_dirty (USPI_UBH(uspi));
-		sb->s_dirt = 0;
+		sb_mark_clean(sb);
 		sb->s_flags |= MS_RDONLY;
 	} else {
 	/*
-- 
1.7.0.1

[PATCHv6 8/9] VFS: rename s_dirt to s_dirty

[Artem Bityutskiy]

From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

... in order to make sure no one accesses the "s_dirt" flag
direclty - this should help to identify build errors earlier.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
---
 include/linux/fs.h |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 20d8cb0..1c11e36 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1319,7 +1319,7 @@ extern spinlock_t sb_lock;
 struct super_block {
 	struct list_head	s_list;		/* Keep this first */
 	dev_t			s_dev;		/* search index; _not_ kdev_t */
-	unsigned char		s_dirt;
+	unsigned char		s_dirty;
 	unsigned char		s_blocksize_bits;
 	unsigned long		s_blocksize;
 	loff_t			s_maxbytes;	/* Max file size */
@@ -1785,15 +1785,15 @@ extern void simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
 
 static inline void sb_mark_dirty(struct super_block *sb)
 {
-	sb->s_dirt = 1;
+	sb->s_dirty = 1;
 }
 static inline void sb_mark_clean(struct super_block *sb)
 {
-	sb->s_dirt = 0;
+	sb->s_dirty = 0;
 }
 static inline int sb_is_dirty(struct super_block *sb)
 {
-	return sb->s_dirt;
+	return sb->s_dirty;
 }
 
 /* Alas, no aliases. Too much hassle with bringing module.h everywhere */
-- 
1.7.0.1

[PATCHv6 9/9] writeback: lessen sync_supers wakeup count

[Artem Bityutskiy]

From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

The 'sync_supers' thread wakes up every 5 seconds (by default) and
writes back all super blocks. It keeps waking up even if there
are no dirty super-blocks. For many file-systems the superblock
becomes dirty very rarely, if ever, so 'sync_supers' does not do
anything most of the time.

This patch improves 'sync_supers' and makes it sleep if all superblocks
are clean and there is nothing to do. This helps saving the power.
This optimization is important for small battery-powered devices.

The locking scheme was provided by Nick Piggin <npiggin@suse.de>

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
---
 include/linux/fs.h |    5 +----
 mm/backing-dev.c   |   40 ++++++++++++++++++++++++++++++++--------
 2 files changed, 33 insertions(+), 12 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 1c11e36..c18c670 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1783,10 +1783,7 @@ extern int get_sb_pseudo(struct file_system_type *, char *,
 	struct vfsmount *mnt);
 extern void simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
 
-static inline void sb_mark_dirty(struct super_block *sb)
-{
-	sb->s_dirty = 1;
-}
+void sb_mark_dirty(struct super_block *sb);
 static inline void sb_mark_clean(struct super_block *sb)
 {
 	sb->s_dirty = 0;
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 660a87a..d751284 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -45,6 +45,7 @@ LIST_HEAD(bdi_pending_list);
 
 static struct task_struct *sync_supers_tsk;
 static struct timer_list sync_supers_timer;
+static unsigned long supers_dirty __read_mostly;
 
 static int bdi_sync_supers(void *);
 static void sync_supers_timer_fn(unsigned long);
@@ -251,7 +252,6 @@ static int __init default_bdi_init(void)
 
 	init_timer(&sync_supers_timer);
 	setup_timer(&sync_supers_timer, sync_supers_timer_fn, 0);
-	bdi_arm_supers_timer();
 
 	err = bdi_init(&default_backing_dev_info);
 	if (!err)
@@ -350,6 +350,21 @@ static void bdi_flush_io(struct backing_dev_info *bdi)
 	writeback_inodes_wbc(&wbc);
 }
 
+void sb_mark_dirty(struct super_block *sb)
+{
+	sb->s_dirty = 1;
+	/*
+	 * sb->s_dirty store must be visible to sync_supers before we load
+	 * supers_dirty in case we need to re-arm the timer.
+	 */
+	smp_mb();
+	if (likely(supers_dirty))
+		return;
+	supers_dirty = 1;
+	bdi_arm_supers_timer();
+}
+EXPORT_SYMBOL_GPL(sb_mark_dirty);
+
 /*
  * kupdated() used to do this. We cannot do it from the bdi_forker_task()
  * or we risk deadlocking on ->s_umount. The longer term solution would be
@@ -362,10 +377,20 @@ static int bdi_sync_supers(void *unused)
 
 	while (!kthread_should_stop()) {
 		set_current_state(TASK_INTERRUPTIBLE);
+		if (supers_dirty)
+			bdi_arm_supers_timer();
 		schedule();
 
+		supers_dirty = 0;
 		/*
-		 * Do this periodically, like kupdated() did before.
+		 * supers_dirty store must be visible to sb_mark_dirty() before
+		 * sync_supers runs (which loads ->s_dirty), so a barrier is
+		 * needed.
+		 */
+		smp_mb();
+		/*
+		 * sync_supers() used to do this periodically, but now we
+		 * wake up only if there are dirty superblocks.
 		 */
 		sync_supers();
 	}
@@ -373,6 +398,11 @@ static int bdi_sync_supers(void *unused)
 	return 0;
 }
 
+static void sync_supers_timer_fn(unsigned long unused)
+{
+	wake_up_process(sync_supers_tsk);
+}
+
 void bdi_arm_supers_timer(void)
 {
 	unsigned long next;
@@ -384,12 +414,6 @@ void bdi_arm_supers_timer(void)
 	mod_timer(&sync_supers_timer, round_jiffies_up(next));
 }
 
-static void sync_supers_timer_fn(unsigned long unused)
-{
-	wake_up_process(sync_supers_tsk);
-	bdi_arm_supers_timer();
-}
-
 static int bdi_forker_task(void *ptr)
 {
 	struct bdi_writeback *me = ptr;
-- 
1.7.0.1

Re: [PATCHv6 0/9] kill unnecessary SB sync wake-ups + cleanups

[Artem Bityutskiy]

On Mon, 2010-07-05 at 15:14 +0300, Artem Bityutskiy wrote:
> here is v6 of my SB sync wakups killing patches, v5 may be found:
> http://marc.info/?l=linux-fsdevel&m=127583599911620&w=2
> 
> This is more of a reminder re-send, I did not get any feed-back for
> v5. Not much changes since v5:
> 
> 1. Drop patches which fix race conditions for s_dirty changes WRT actual
>    write-back - these things are independent and I am planning to go through
>    that separately.
> 2. Add "Acked-by" to the btrfs patch.
> 3. Fold all per-fs patches which introduce SB accessors into one big patch.

Hi Al,

you "unofficially" told me that you want to get rid of '->write_super()'
and 'sync_supers()' should not exist. And FSes which really need
'->write_super()' should implement that themselves.

I will try to work on this, but a bit later, after my holidays. But
could you please:

1. confirm that you want to kill '->write_super()' and '->s_dirt'
   "officially", so that I could refer to this when sending patches

2. pick up patches 1-6 from this series, this would make my life easier
   a bit.

I'm not sure then what do do with:

commit 140236b4b1c749c9b795ea3d11558a0eb5a3a080
Author: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Date:   Thu Jun 10 13:56:33 2010 +0300

    VFS: introduce s_dirty accessors

which Linus merged, but which is now not needed, since you now want me
to kill '->write_super()' completely. Will you take care of this please?

Thanks!

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)

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Re: [PATCHv6 0/9] kill unnecessary SB sync wake-ups + cleanups

[Al Viro]

On Thu, Jul 22, 2010 at 10:54:40AM +0300, Artem Bityutskiy wrote:
> On Mon, 2010-07-05 at 15:14 +0300, Artem Bityutskiy wrote:
> > here is v6 of my SB sync wakups killing patches, v5 may be found:
> > http://marc.info/?l=linux-fsdevel&m=127583599911620&w=2
> > 
> > This is more of a reminder re-send, I did not get any feed-back for
> > v5. Not much changes since v5:
> > 
> > 1. Drop patches which fix race conditions for s_dirty changes WRT actual
> >    write-back - these things are independent and I am planning to go through
> >    that separately.
> > 2. Add "Acked-by" to the btrfs patch.
> > 3. Fold all per-fs patches which introduce SB accessors into one big patch.
> 
> Hi Al,
> 
> you "unofficially" told me that you want to get rid of '->write_super()'
> and 'sync_supers()' should not exist. And FSes which really need
> '->write_super()' should implement that themselves.
> 
> I will try to work on this, but a bit later, after my holidays. But
> could you please:
> 
> 1. confirm that you want to kill '->write_super()' and '->s_dirt'
>    "officially", so that I could refer to this when sending patches

ACK.

> 2. pick up patches 1-6 from this series, this would make my life easier
>    a bit.
> 
> I'm not sure then what do do with:

Will be in for-next tonight.
 
> commit 140236b4b1c749c9b795ea3d11558a0eb5a3a080
> Author: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
> Date:   Thu Jun 10 13:56:33 2010 +0300
> 
>     VFS: introduce s_dirty accessors
> 
> which Linus merged, but which is now not needed, since you now want me
> to kill '->write_super()' completely. Will you take care of this please?

Once that stuff is done, we'll be able to get rid of those just fine..

FWIW, I'm tempted to add affs_dirty_sb()/affs_clean_sb()/affs_is_clean() and
corresponding helpers for other filesystems in the series and fold conversions
to those into your 1--6; you'll need insertion points for your "schedule
some work" logics whether it's done on per-fs-type basis or globally...

Re: [PATCHv6 0/9] kill unnecessary SB sync wake-ups + cleanups

[Artem Bityutskiy]

On Thu, 2010-07-22 at 09:50 +0100, Al Viro wrote:
> > 2. pick up patches 1-6 from this series, this would make my life easier
> >    a bit.
> > 
> > I'm not sure then what do do with:
> 
> Will be in for-next tonight.

See them now, thanks.

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)

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