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authorJosef Bacik <josef@redhat.com>2010-11-17 20:46:15 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2011-01-12 20:16:43 -0500
commit79124f18b335172e1916075c633745e12dae1dac (patch)
tree5be32543409771d6f7a1d8d3d1f7ffca03105538 /fs
parente1181ee6575d7970bad15aaa852784b4972d2af8 (diff)
downloadblackbird-op-linux-79124f18b335172e1916075c633745e12dae1dac.tar.gz
blackbird-op-linux-79124f18b335172e1916075c633745e12dae1dac.zip
fs: add hole punching to fallocate
Hole punching has already been implemented by XFS and OCFS2, and has the potential to be implemented on both BTRFS and EXT4 so we need a generic way to get to this feature. The simplest way in my mind is to add FALLOC_FL_PUNCH_HOLE to fallocate() since it already looks like the normal fallocate() operation. I've tested this patch with XFS and BTRFS to make sure XFS did what it's supposed to do and that BTRFS failed like it was supposed to. Thank you, Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/open.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/open.c b/fs/open.c
index 4197b9ed023d..5b6ef7e2859e 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -223,7 +223,12 @@ int do_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
return -EINVAL;
/* Return error if mode is not supported */
- if (mode && !(mode & FALLOC_FL_KEEP_SIZE))
+ if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
+ return -EOPNOTSUPP;
+
+ /* Punch hole must have keep size set */
+ if ((mode & FALLOC_FL_PUNCH_HOLE) &&
+ !(mode & FALLOC_FL_KEEP_SIZE))
return -EOPNOTSUPP;
if (!(file->f_mode & FMODE_WRITE))
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