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| author | Al Viro <viro@zeniv.linux.org.uk> | 2015-04-08 17:00:32 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-04-19 10:10:50 +0200 |
| commit | f3326a5594dbb8faf47fb105740baa936d3445d1 (patch) | |
| tree | 9a0f8b6a82a2f637789d22550e521739661d296d | |
| parent | 054fa2f11b8458100b7c839a728f0439be863740 (diff) | |
| download | lwn-f3326a5594dbb8faf47fb105740baa936d3445d1.tar.gz lwn-f3326a5594dbb8faf47fb105740baa936d3445d1.zip | |
ocfs2: _really_ sync the right range
commit 64b4e2526d1cf6e6a4db6213d6e2b6e6ab59479a upstream.
"ocfs2 syncs the wrong range" had been broken; prior to it the
code was doing the wrong thing in case of O_APPEND, all right,
but _after_ it we were syncing the wrong range in 100% cases.
*ppos, aka iocb->ki_pos is incremented prior to that point,
so we are always doing sync on the area _after_ the one we'd
written to.
Spotted by Joseph Qi <joseph.qi@huawei.com> back in January;
unfortunately, I'd missed his mail back then ;-/
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/ocfs2/file.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index 46387e49aa46..8cd6474e248f 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -2372,10 +2372,14 @@ out_dio: /* buffered aio wouldn't have proper lock coverage today */ BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT)); + if (unlikely(written <= 0)) + goto no_sync; + if (((file->f_flags & O_DSYNC) && !direct_io) || IS_SYNC(inode) || ((file->f_flags & O_DIRECT) && !direct_io)) { - ret = filemap_fdatawrite_range(file->f_mapping, *ppos, - *ppos + count - 1); + ret = filemap_fdatawrite_range(file->f_mapping, + iocb->ki_pos - written, + iocb->ki_pos - 1); if (ret < 0) written = ret; @@ -2388,10 +2392,12 @@ out_dio: } if (!ret) - ret = filemap_fdatawait_range(file->f_mapping, *ppos, - *ppos + count - 1); + ret = filemap_fdatawait_range(file->f_mapping, + iocb->ki_pos - written, + iocb->ki_pos - 1); } +no_sync: /* * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io * function pointer which is called when o_direct io completes so that |