include/linux/exportfs.h

1 /* SPDX-License-Identifier: GPL-2.0 */
33 	 * 32bit inode number, 32 bit generation number.
38 	 * 32bit inode number, 32 bit generation number,
39 	 * 32 bit parent directory inode number.
44 	 * 64 bit object ID, 64 bit root object ID,
45 	 * 32 bit generation number.
50 	 * 64 bit object ID, 64 bit root object ID,
51 	 * 32 bit generation number,
52 	 * 64 bit parent object ID, 32 bit parent generation.
57 	 * 64 bit object ID, 64 bit root object ID,
58 	 * 32 bit generation number,
59 	 * 64 bit parent object ID, 32 bit parent generation,
60 	 * 64 bit parent root object ID.
65 	 * 32 bit block number, 16 bit partition reference,
66 	 * 16 bit unused, 32 bit generation number.
71 	 * 32 bit block number, 16 bit partition reference,
72 	 * 16 bit unused, 32 bit generation number,
73 	 * 32 bit parent block number, 32 bit parent generation number
78 	 * 64 bit checkpoint number, 64 bit inode number,
79 	 * 32 bit generation number.
84 	 * 64 bit checkpoint number, 64 bit inode number,
85 	 * 32 bit generation number, 32 bit parent generation.
86 	 * 64 bit parent inode number.
91 	 * 32 bit generation number, 40 bit i_pos.
96 	 * 32 bit generation number, 40 bit i_pos,
97 	 * 32 bit parent generation number, 40 bit parent i_pos
102 	 * 64 bit inode number, 32 bit generation number.
107 	 * 64 bit inode number, 32 bit generation number,
108 	 * 64 bit parent inode number, 32 bit parent generation.
113 	 * 128 bit child FID (struct lu_fid)
114 	 * 128 bit parent FID (struct lu_fid)
119 	 * 64 bit inode number, 32 bit subvolume, 32 bit generation number:
125 	 * 64 bit unique kernfs id
160 #define EXPORT_FH_FID		0x2 /* File handle may be non-decodeable */
163  * struct export_operations - for nfsd to communicate with file systems
164  * @encode_fh:      encode a file handle fragment from a dentry
165  * @fh_to_dentry:   find the implied object and get a dentry for it
166  * @fh_to_parent:   find the implied object's parent and get a dentry for it
167  * @get_name:       find the name for a given inode in a given directory
168  * @get_parent:     find the parent of a given directory
177  *    file referred to by the &struct dentry @de.  If @flag has CONNECTABLE bit
178  *    set, the encode_fh() should store sufficient information so that a good
180  *    filesystem.   This typically means storing a reference to de->d_parent in
187  *    @fh_to_dentry is given a &struct super_block (@sb) and a file handle
188  *    fragment (@fh, @fh_len). It should return a &struct dentry which refers
190  *    it should return a %NULL pointer if the file cannot be found, or an
191  *    %ERR_PTR error code of %ENOMEM if a memory allocation failure occurred.
194  *    Any suitable dentry can be returned including, if necessary, a new dentry
199  *    Same as @fh_to_dentry, except that it returns a pointer to the parent
203  *    @get_name should find a name for the given @child in the given @parent
205  *    understanding that it is already pointing to a %NAME_MAX+1 sized
206  *    buffer.   get_name() should return %0 on success, a negative error code
207  *    or error.  @get_name will be called without @parent->i_mutex held.
211  *    is also a directory.  In the event that it cannot be found, or storage
212  *    space cannot be allocated, a %ERR_PTR should be returned.
218  *    get_parent is called with child->d_inode->i_mutex down
253  * exportfs_lock_op_is_async() - export op supports async lock operation
262 	return export_ops->flags & EXPORT_OP_ASYNC_LOCK;  in exportfs_lock_op_is_async()
273 	return !nop || nop->encode_fh;  in exportfs_can_encode_fid()
278 	return nop && nop->fh_to_dentry;  in exportfs_can_decode_fh()
285 	 * If a non-decodeable file handle was requested, we only need to make  in exportfs_can_encode_fh()
286 	 * sure that filesystem did not opt-out of encoding fid.  in exportfs_can_encode_fh()
292 	 * If a decodeable file handle was requested, we need to make sure that  in exportfs_can_encode_fh()