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btrfs: Return EINVAL when length to trim is less than FSB 

Currently if len argument in btrfs_ioctl_fitrim() is smaller than
one FSB we will continue and finally return 0 bytes discarded.
However if the length to discard is smaller then file system block
we should really return EINVAL.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
This commit is contained in:
Lukas Czerner 2012-10-16 09:34:36 +00:00 committed by Chris Mason
parent 5b7ff5b3c4
commit e515c18bfe
1 changed files with 2 additions and 1 deletions
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3
fs/btrfs/ioctl.c
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@ -343,7 +343,8 @@ static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg)
return -EOPNOTSUPP;
if (copy_from_user(&range, arg, sizeof(range)))
return -EFAULT;
if (range.start > total_bytes)
if (range.start > total_bytes ||
range.len < fs_info->sb->s_blocksize)
return -EINVAL;
range.len = min(range.len, total_bytes - range.start);