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| author | Hugh Dickins <hughd@google.com> | 2014-06-23 13:22:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-06-23 16:47:43 -0700 |
| commit | 13ace4d0d9db40e10ecd66dfda14e297571be813 (patch) | |
| tree | 9ed45b2ee2053f1b0fd8f1efd0f9c5c3d8f5671c | |
| parent | 7cdb0d25bc93e936edbfde12fe277ee21b88c1ef (diff) | |
| download | lwn-13ace4d0d9db40e10ecd66dfda14e297571be813.tar.gz lwn-13ace4d0d9db40e10ecd66dfda14e297571be813.zip | |
tmpfs: ZERO_RANGE and COLLAPSE_RANGE not currently supported
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>
Cc: <stable@vger.kernel.org> [3.15]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/shmem.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index f484c276e994..91b912b37b8c 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1724,6 +1724,9 @@ 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) { |