include/linux/exportfs.h

1 /* SPDX-License-Identifier: GPL-2.0 */
159 #define EXPORT_FH_CONNECTABLE	0x1 /* Encode file handle with parent */
160 #define EXPORT_FH_FID		0x2 /* File handle may be non-decodeable */
161 #define EXPORT_FH_DIR_ONLY	0x4 /* Only decode file handle for a directory */
164  * struct export_operations - for nfsd to communicate with file systems
165  * @encode_fh:      encode a file handle fragment from a dentry
180  *    attempt can be made to find not only the file but also it's place in the
181  *    filesystem.   This typically means storing a reference to de->d_parent in
183  *    success and on error returns 255 (if the space needed to encode fh is
185  *    size(in 4 byte unit) needed to encode the file handle.
208  *    or error.  @get_name will be called without @parent->i_mutex held.
219  *    get_parent is called with child->d_inode->i_mutex down
254  * exportfs_lock_op_is_async() - export op supports async lock operation
263 	return export_ops->flags & EXPORT_OP_ASYNC_LOCK;  in exportfs_lock_op_is_async()
274 	return !nop || nop->encode_fh;  in exportfs_can_encode_fid()
279 	return nop && nop->fh_to_dentry;  in exportfs_can_decode_fh()
286 	 * If a non-decodeable file handle was requested, we only need to make  in exportfs_can_encode_fh()
287 	 * sure that filesystem did not opt-out of encoding fid.  in exportfs_can_encode_fh()