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authorAl Viro <viro@zeniv.linux.org.uk>2015-04-08 17:00:32 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-04-19 10:10:50 +0200
commitf3326a5594dbb8faf47fb105740baa936d3445d1 (patch)
tree9a0f8b6a82a2f637789d22550e521739661d296d /fs
parent054fa2f11b8458100b7c839a728f0439be863740 (diff)
downloadlinux-linaro-stable-f3326a5594dbb8faf47fb105740baa936d3445d1.tar.gz
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/ocfs2/file.c14
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