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Commit e515c18b authored by Lukas Czerner's avatar Lukas Czerner Committed by Chris Mason
Browse files

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: default avatarLukas Czerner <lczerner@redhat.com>
parent 5b7ff5b3

fs/btrfs/ioctl.c

+2 −1
Original line number Diff line number Diff line
@@ -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);