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msync: fix incorrect fstart calculation

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Fix a regression caused by 7fc34a62ca ("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 <[email protected]>
Signed-off-by: Ashish Sangwan <[email protected]>
Reported-by: Eric Whitney <[email protected]>
Tested-by: Eric Whitney <[email protected]>
Acked-by: Matthew Wilcox <[email protected]>
Reviewed-by: Lukas Czerner <[email protected]>
Tested-by: Lukas Czerner <[email protected]>
Reviewed-by: Theodore Ts'o <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Namjae Jeon 2014-07-02 15:22:36 -07:00 • committed by Linus Torvalds
commit 496a8e6865
1 changed files with 2 additions and 1 deletions
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3
mm/msync.c
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@ -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 &&