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author | Jan Kara <jack@suse.cz> | 2012-05-03 14:47:56 +0200 |
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committer | Fengguang Wu <fengguang.wu@intel.com> | 2012-05-06 13:43:38 +0800 |
commit | cc1676d917f32504dbadc858fa790bc524c9f0da (patch) | |
tree | d665d5ad0a844a6b1aff74deb4c8aa01c7596135 /fs/fs-writeback.c | |
parent | 365b94ae67d2915d412b593d47449a6bffed9d37 (diff) | |
download | linux-cc1676d917f32504dbadc858fa790bc524c9f0da.tar.gz linux-cc1676d917f32504dbadc858fa790bc524c9f0da.tar.bz2 linux-cc1676d917f32504dbadc858fa790bc524c9f0da.zip |
writeback: Move requeueing when I_SYNC set to writeback_sb_inodes()
When writeback_single_inode() is called on inode which has I_SYNC already
set while doing WB_SYNC_NONE, inode is moved to b_more_io list. However
this makes sense only if the caller is flusher thread. For other callers of
writeback_single_inode() it doesn't really make sense and may be even wrong
- flusher thread may be doing WB_SYNC_ALL writeback in parallel.
So we move requeueing from writeback_single_inode() to writeback_sb_inodes().
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Diffstat (limited to 'fs/fs-writeback.c')
-rw-r--r-- | fs/fs-writeback.c | 30 |
1 files changed, 16 insertions, 14 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index dd41437b7a1f..65cd14769226 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -373,21 +373,8 @@ writeback_single_inode(struct inode *inode, struct bdi_writeback *wb, WARN_ON(inode->i_state & I_WILL_FREE); if (inode->i_state & I_SYNC) { - /* - * If this inode is locked for writeback and we are not doing - * writeback-for-data-integrity, move it to b_more_io so that - * writeback can proceed with the other inodes on s_io. - * - * We'll have another go at writing back this inode when we - * completed a full scan of b_io. - */ - if (wbc->sync_mode != WB_SYNC_ALL) { - requeue_io(inode, wb); - trace_writeback_single_inode_requeue(inode, wbc, - nr_to_write); + if (wbc->sync_mode != WB_SYNC_ALL) return 0; - } - /* * It's a data-integrity sync. We must wait. */ @@ -576,6 +563,21 @@ static long writeback_sb_inodes(struct super_block *sb, redirty_tail(inode, wb); continue; } + if ((inode->i_state & I_SYNC) && wbc.sync_mode != WB_SYNC_ALL) { + /* + * If this inode is locked for writeback and we are not + * doing writeback-for-data-integrity, move it to + * b_more_io so that writeback can proceed with the + * other inodes on s_io. + * + * We'll have another go at writing back this inode + * when we completed a full scan of b_io. + */ + spin_unlock(&inode->i_lock); + requeue_io(inode, wb); + trace_writeback_sb_inodes_requeue(inode); + continue; + } __iget(inode); write_chunk = writeback_chunk_size(wb->bdi, work); wbc.nr_to_write = write_chunk; |