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authorJosef Bacik <josef@redhat.com>2010-11-17 20:46:19 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2011-01-12 20:16:44 -0500
commit23a8519b55235660f6fb7d6f394a912de9d23208 (patch)
tree7df68ca9459ccc15cb40902a3c9c8b62b710aefa
parentd6dc8462f471f7bbb49c42c147bf84de0c977099 (diff)
Btrfs: fail if we try to use hole punch
Btrfs doesn't have the ability to punch holes yet, so make sure we return EOPNOTSUPP if we try to use hole punching through fallocate. This support can be added later. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/btrfs/inode.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index f870aefc59dd..a3798a3aa0d2 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7115,6 +7115,10 @@ static long btrfs_fallocate(struct inode *inode, int mode,
alloc_start = offset & ~mask;
alloc_end = (offset + len + mask) & ~mask;
+ /* We only support the FALLOC_FL_KEEP_SIZE mode */
+ if (mode && (mode != FALLOC_FL_KEEP_SIZE))
+ return -EOPNOTSUPP;
+
/*
* wait for ordered IO before we have any locks. We'll loop again
* below with the locks held.