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authorNamjae Jeon <namjae.jeon@samsung.com>2014-07-02 15:22:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-07-03 09:21:53 -0700
commit496a8e68654a5f42db90c650be305dcb50bfebdb (patch)
tree04c36915ff7f8df1f9a1f93fc413b132408144fa
parent2e32baea46ce542c561a519414c840295b229c8f (diff)
msync: fix incorrect fstart calculation
Fix a regression caused by 7fc34a62ca44 ("mm/msync.c: sync only the requested range in msync()"). xfstests generic/075 fail occured on ext4 data=journal mode because the intended range was not syncing due to wrong fstart calculation. Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com> Signed-off-by: Ashish Sangwan <a.sangwan@samsung.com> Reported-by: Eric Whitney <enwlinux@gmail.com> Tested-by: Eric Whitney <enwlinux@gmail.com> Acked-by: Matthew Wilcox <matthew.r.wilcox@intel.com> Reviewed-by: Lukas Czerner <lczerner@redhat.com> Tested-by: Lukas Czerner <lczerner@redhat.com> Reviewed-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/msync.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/msync.c b/mm/msync.c
index a5c673669ca6..992a1673d488 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -78,7 +78,8 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
goto out_unlock;
}
file = vma->vm_file;
- fstart = start + ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
+ fstart = (start - vma->vm_start) +
+ ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
fend = fstart + (min(end, vma->vm_end) - start) - 1;
start = vma->vm_end;
if ((flags & MS_SYNC) && file &&

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