21 static void afs_replace_symlink(struct afs_vnode *vnode, struct afs_symlink *symlink)  in afs_replace_symlink()  argument
25 	old = rcu_replace_pointer(vnode->symlink, symlink,  in afs_replace_symlink()
26 				  lockdep_is_held(&vnode->validate_lock));  in afs_replace_symlink()
35 void afs_invalidate_symlink(struct afs_vnode *vnode)  in afs_invalidate_symlink()  argument
37 	afs_replace_symlink(vnode, NULL);  in afs_invalidate_symlink()
43 void afs_evict_symlink(struct afs_vnode *vnode)  in afs_evict_symlink()  argument
47 	old = rcu_replace_pointer(vnode->symlink, NULL, true);  in afs_evict_symlink()
56 void afs_init_new_symlink(struct afs_vnode *vnode, struct afs_operation *op)  in afs_init_new_symlink()  argument
63 	rcu_assign_pointer(vnode->symlink, symlink);  in afs_init_new_symlink()
66 	if (!fscache_cookie_enabled(netfs_i_cookie(&vnode->netfs)))  in afs_init_new_symlink()
69 	if (netfs_alloc_folioq_buffer(NULL, &vnode->directory, &dsize, size,  in afs_init_new_symlink()
70 				      mapping_gfp_mask(vnode->netfs.inode.i_mapping)) < 0)  in afs_init_new_symlink()
73 	vnode->directory_size = dsize;  in afs_init_new_symlink()
74 	p = kmap_local_folio(folioq_folio(vnode->directory, 0), 0);  in afs_init_new_symlink()
77 	netfs_single_mark_inode_dirty(&vnode->netfs.inode);  in afs_init_new_symlink()
83 static ssize_t afs_do_read_symlink(struct afs_vnode *vnode)  in afs_do_read_symlink()  argument
90 	i_size = i_size_read(&vnode->netfs.inode);  in afs_do_read_symlink()
92 		trace_afs_file_error(vnode, -EFBIG, afs_file_error_dir_big);  in afs_do_read_symlink()
96 	if (!vnode->directory) {  in afs_do_read_symlink()
100 						&vnode->directory, &cur_size, PAGE_SIZE,  in afs_do_read_symlink()
101 						mapping_gfp_mask(vnode->netfs.inode.i_mapping));  in afs_do_read_symlink()
102 		vnode->directory_size = PAGE_SIZE - 1;  in afs_do_read_symlink()
107 	iov_iter_folio_queue(&iter, ITER_DEST, vnode->directory, 0, 0, PAGE_SIZE);  in afs_do_read_symlink()
112 	ret = netfs_read_single(&vnode->netfs.inode, NULL, &iter);  in afs_do_read_symlink()
116 			trace_afs_file_error(vnode, -EFBIG, afs_file_error_dir_big);  in afs_do_read_symlink()
119 		vnode->directory_size = i_size;  in afs_do_read_symlink()
130 		const char *s = kmap_local_folio(folioq_folio(vnode->directory, 0), 0);  in afs_do_read_symlink()
135 		afs_replace_symlink(vnode, symlink);  in afs_do_read_symlink()
138 	if (!fscache_cookie_enabled(netfs_i_cookie(&vnode->netfs))) {  in afs_do_read_symlink()
139 		netfs_free_folioq_buffer(vnode->directory);  in afs_do_read_symlink()
140 		vnode->directory = NULL;  in afs_do_read_symlink()
141 		vnode->directory_size = 0;  in afs_do_read_symlink()
147 static ssize_t afs_read_symlink(struct afs_vnode *vnode)  in afs_read_symlink()  argument
151 	fscache_use_cookie(afs_vnode_cache(vnode), false);  in afs_read_symlink()
152 	ret = afs_do_read_symlink(vnode);  in afs_read_symlink()
153 	fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL);  in afs_read_symlink()
166 	struct afs_vnode *vnode = AFS_FS_I(inode);  in afs_get_link()  local
171 		symlink = rcu_dereference(vnode->symlink);  in afs_get_link()
172 		if (!symlink || !afs_check_validity(vnode))  in afs_get_link()
178 	if (vnode->symlink) {  in afs_get_link()
179 		ret = afs_validate(vnode, NULL);  in afs_get_link()
183 		down_read(&vnode->validate_lock);  in afs_get_link()
184 		if (vnode->symlink)  in afs_get_link()
186 		up_read(&vnode->validate_lock);  in afs_get_link()
189 	if (down_write_killable(&vnode->validate_lock) < 0)  in afs_get_link()
191 	if (!vnode->symlink) {  in afs_get_link()
192 		ret = afs_read_symlink(vnode);  in afs_get_link()
194 			up_write(&vnode->validate_lock);  in afs_get_link()
199 	downgrade_write(&vnode->validate_lock);  in afs_get_link()
202 	symlink = rcu_dereference_protected(vnode->symlink,  in afs_get_link()
203 					    lockdep_is_held(&vnode->validate_lock));  in afs_get_link()
205 	up_read(&vnode->validate_lock);  in afs_get_link()
237 	struct afs_vnode *vnode = AFS_FS_I(mapping->host);  in afs_symlink_writepages()  local
241 	if (!down_read_trylock(&vnode->validate_lock)) {  in afs_symlink_writepages()
244 			netfs_single_mark_inode_dirty(&vnode->netfs.inode);  in afs_symlink_writepages()
247 		down_read(&vnode->validate_lock);  in afs_symlink_writepages()
250 	if (vnode->directory &&  in afs_symlink_writepages()
251 	    atomic64_read(&vnode->cb_expires_at) != AFS_NO_CB_PROMISE) {  in afs_symlink_writepages()
252 		iov_iter_folio_queue(&iter, ITER_SOURCE, vnode->directory, 0, 0,  in afs_symlink_writepages()
253 				     i_size_read(&vnode->netfs.inode));  in afs_symlink_writepages()
258 		mutex_lock(&vnode->netfs.wb_lock);  in afs_symlink_writepages()
259 		netfs_free_folioq_buffer(vnode->directory);  in afs_symlink_writepages()
260 		vnode->directory = NULL;  in afs_symlink_writepages()
261 		vnode->directory_size = 0;  in afs_symlink_writepages()
262 		mutex_unlock(&vnode->netfs.wb_lock);  in afs_symlink_writepages()
267 	up_read(&vnode->validate_lock);  in afs_symlink_writepages()