From: Jan Kara Date: Tue, 3 Jul 2012 14:45:27 +0000 (+0200) Subject: vfs: Move noop_backing_dev_info check from sync into writeback X-Git-Tag: MMI-PSA29.97-13-9~16195^2~73 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6eedc70150d55b5885800eb6664ea226dc2cb66f;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git 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 Signed-off-by: Jan Kara Signed-off-by: Al Viro --- diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 41a3ccff18d8..8f660dd6137a 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 11e3d1c44901..b3d2a001293f 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);