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tmpfs: ZERO_RANGE and COLLAPSE_RANGE not currently supported

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commit 13ace4d0d9 upstream.

I was well aware of FALLOC_FL_ZERO_RANGE and FALLOC_FL_COLLAPSE_RANGE
support being added to fallocate(); but didn't realize until now that I
had been too stupid to future-proof shmem_fallocate() against new
additions.  -EOPNOTSUPP instead of going on to ordinary fallocation.

Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hugh Dickins
2014-06-23 13:22:03 -07:00
committed by Greg Kroah-Hartman
parent faff2e120d
commit 264b86651c
1 changed files with 3 additions and 0 deletions
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mm/shmem.c
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@@ -1728,6 +1728,9 @@ static long shmem_fallocate(struct file *file, int mode, loff_t offset,
pgoff_t start, index, end;
int error;
if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
return -EOPNOTSUPP;
mutex_lock(&inode->i_mutex);
if (mode & FALLOC_FL_PUNCH_HOLE) {