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make the feature checks in ->fallocate future proof

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Instead of various home grown checks that might need updates for new
flags just check for any bit outside the mask of the features supported
by the filesystem.  This makes the check future proof for any newly
added flag.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig
2011-01-14 13:07:30 +01:00
committed by Al Viro
parent eb745dbccc
commit 64c23e8687
5 changed files with 8 additions and 3 deletions
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fs/btrfs/inode.c
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@@ -7116,7 +7116,7 @@ static long btrfs_fallocate(struct inode *inode, int mode,
alloc_end = (offset + len + mask) & ~mask;
/* We only support the FALLOC_FL_KEEP_SIZE mode */
if (mode && (mode != FALLOC_FL_KEEP_SIZE))
if (mode & ~FALLOC_FL_KEEP_SIZE)
return -EOPNOTSUPP;
/*