xfs: switch xfs_attrmulti_attr_get to lazy attr buffer allocation

Let the low-level attr code only allocate the needed buffer size
for xfs_attrmulti_attr_get instead of allocating the upper bound
at the top of the call chain.

Suggested-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index ef8e378..5a1d2b9 100644 (file)
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -481,10 +481,6 @@ xfs_attrmulti_attr_get(
        if (*len > XFS_XATTR_SIZE_MAX)
                return -EINVAL;
 
-       args.value = kmem_zalloc_large(*len, 0);
-       if (!args.value)
-               return -ENOMEM;
-
        error = xfs_attr_get(&args);
        if (error)
                goto out_kfree;