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| author |   Bob Peterson <rpeterso@redhat.com> | 2016-01-27 16:00:38 -0500 |
|---|---|---|
| committer | Bob Peterson <rpeterso@redhat.com> | 2016-03-15 10:46:28 -0400 |
| commit | 2df6f47150b6afbb258ed1d5c9ed78c23df05053 (patch) | |
| tree | 5f67da00fb95f46a0f324d49b8714fdb1be83d62 | |
| parent | gfs2: avoid uninitialized variable warning (diff) | |
| download | linux-dev-2df6f47150b6afbb258ed1d5c9ed78c23df05053.tar.xz linux-dev-2df6f47150b6afbb258ed1d5c9ed78c23df05053.zip | |
GFS2: Fix direct IO write rounding error
The fsx test in xfstests was failing because it was using direct IO
writes which were using a bad calculation. It was using
loff_t lstart = offset & (PAGE_CACHE_SIZE - 1); when it should be
loff_t lstart = offset & ~(PAGE_CACHE_SIZE - 1);
Thus, the write at offset 0x67e00 was calculating lstart to be
0xe00, the address of our corruption. Instead, it should have been
0x67000. This patch fixes the calculation.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Acked-by: Steven Whitehouse <swhiteho@redhat.com>
| -rw-r--r-- | fs/gfs2/aops.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c index 93f07465e5a6..aa016e4b8bec 100644 --- a/fs/gfs2/aops.c +++ b/fs/gfs2/aops.c @@ -1082,7 +1082,7 @@ static ssize_t gfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter, * the first place, mapping->nr_pages will always be zero. */ if (mapping->nrpages) { - loff_t lstart = offset & (PAGE_CACHE_SIZE - 1); + loff_t lstart = offset & ~(PAGE_CACHE_SIZE - 1); loff_t len = iov_iter_count(iter); loff_t end = PAGE_ALIGN(offset + len) - 1; |