Commit 496a8e68 authored by Namjae Jeon's avatar Namjae Jeon Committed by Linus Torvalds

msync: fix incorrect fstart calculation

Fix a regression caused by 7fc34a62 ("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: default avatarNamjae Jeon <>
Signed-off-by: default avatarAshish Sangwan <>
Reported-by: default avatarEric Whitney <>
Tested-by: default avatarEric Whitney <>
Acked-by: default avatarMatthew Wilcox <>
Reviewed-by: default avatarLukas Czerner <>
Tested-by: default avatarLukas Czerner <>
Reviewed-by: default avatarTheodore Ts'o <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 2e32baea
......@@ -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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