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authorJan Kara <jack@suse.cz>2012-07-03 16:45:27 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2012-07-22 23:58:18 +0400
commit6eedc70150d55b5885800eb6664ea226dc2cb66f (patch)
treee0d0762e047d1fae5d7b6ead1214545bcb205f4e
parent9e9ad5f408889db6038a59b38ede29ff1ba9ef2f (diff)
downloadop-kernel-dev-6eedc70150d55b5885800eb6664ea226dc2cb66f.zip
op-kernel-dev-6eedc70150d55b5885800eb6664ea226dc2cb66f.tar.gz
vfs: Move noop_backing_dev_info check from sync into writeback
In principle, a filesystem may want to have ->sync_fs() called during sync(1) although it does not have a bdi (i.e. s_bdi is set to noop_backing_dev_info). Only writeback code really needs bdi set to something reasonable. So move the checks where they are more logical. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/fs-writeback.c5
-rw-r--r--fs/sync.c7
2 files changed, 5 insertions, 7 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 41a3ccf..8f660dd 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -1315,6 +1315,8 @@ void writeback_inodes_sb_nr(struct super_block *sb,
.reason = reason,
};
+ if (sb->s_bdi == &noop_backing_dev_info)
+ return;
WARN_ON(!rwsem_is_locked(&sb->s_umount));
bdi_queue_work(sb->s_bdi, &work);
wait_for_completion(&done);
@@ -1398,6 +1400,9 @@ void sync_inodes_sb(struct super_block *sb)
.reason = WB_REASON_SYNC,
};
+ /* Nothing to do? */
+ if (sb->s_bdi == &noop_backing_dev_info)
+ return;
WARN_ON(!rwsem_is_locked(&sb->s_umount));
bdi_queue_work(sb->s_bdi, &work);
diff --git a/fs/sync.c b/fs/sync.c
index 11e3d1c..b3d2a00 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -29,13 +29,6 @@
*/
static int __sync_filesystem(struct super_block *sb, int wait)
{
- /*
- * This should be safe, as we require bdi backing to actually
- * write out data in the first place
- */
- if (sb->s_bdi == &noop_backing_dev_info)
- return 0;
-
if (sb->s_qcop && sb->s_qcop->quota_sync)
sb->s_qcop->quota_sync(sb, -1, wait);
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