/* Retrieve an extended attribute and its value. Must have ilock. */
int
xfs_attr_get_ilocked(
struct xfs_inode *ip,
struct xfs_da_args *args)
{
ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
if (!xfs_inode_hasattr(ip))
return -ENOATTR;
else if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL)
return xfs_attr_shortform_getvalue(args);
else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK))
return xfs_attr_leaf_get(args);
else
return xfs_attr_node_get(args);
}
int
xfs_attr_get(
struct xfs_inode *ip,
const unsigned char *name,
unsigned char *value,
int *valuelenp,
int flags)
{
struct xfs_da_args args;
uint lock_mode;
int error;
XFS_STATS_INC(ip->i_mount, xs_attr_get);
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
return -EIO;
if (!xfs_inode_hasattr(ip))
return -ENOATTR;
error = xfs_attr_args_init(&args, ip, name, flags);
if (error)
return error;
args.value = value;
args.valuelen = *valuelenp;
/* Entirely possible to look up a name which doesn't exist */
args.op_flags = XFS_DA_OP_OKNOENT;
lock_mode = xfs_ilock_attr_map_shared(ip);
if (!xfs_inode_hasattr(ip))
error = -ENOATTR;
else if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL)
error = xfs_attr_shortform_getvalue(&args);
else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK))
error = xfs_attr_leaf_get(&args);
else
error = xfs_attr_node_get(&args);
xfs_iunlock(ip, lock_mode);
*valuelenp = args.valuelen;
return error == -EEXIST ? 0 : error;
}