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>
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index f5a2e6c..da518de 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -343,7 +343,8 @@
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);