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->write_super lock_super pushdown

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Push down lock_super into ->write_super instances and remove it from the
caller.

Following filesystem don't need ->s_lock in ->write_super and are skipped:

 * bfs, nilfs2 - no other uses of s_lock and have internal locks in
	->write_super
 * ext2 - uses BKL in ext2_write_super and has internal calls without s_lock
 * reiserfs - no other uses of s_lock as has reiserfs_write_lock (BKL) in
 	->write_super
 * xfs - no other uses of s_lock and uses internal lock (buffer lock on
	superblock buffer) to serialize ->write_super.  Also xfs_fs_write_super
	is superflous and will go away in the next merge window

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig
2009-05-11 23:35:03 +02:00
committed by Al Viro
parent 01ba687577
commit ebc1ac1645
11 changed files with 32 additions and 17 deletions
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4
fs/ext4/super.c
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@@ -579,7 +579,7 @@ static void ext4_put_super(struct super_block *sb)
lock_super(sb);
lock_kernel();
if (sb->s_dirt)
ext4_write_super(sb);
ext4_commit_super(sb, 1);
ext4_release_system_zone(sb);
ext4_mb_release(sb);
@@ -3336,7 +3336,9 @@ int ext4_force_commit(struct super_block *sb)
static void ext4_write_super(struct super_block *sb)
{
lock_super(sb);
ext4_commit_super(sb, 1);
unlock_super(sb);
}
static int ext4_sync_fs(struct super_block *sb, int wait)