fs/lockd/svcsubs.c

28  * Global file hash table
46 static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)
48 	struct inode *inode = nlmsvc_file_inode(file);
59 static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)
80  * Open the file. Note that if we're reexporting, for example,
84  * the file.
87 			   struct nlm_file *file, int mode)
89 	struct file **fp = &file->f_file[mode];
94 	nfserr = nlmsvc_ops->fopen(rqstp, &file->f_handle, fp, mode);
101  * Lookup file info. If it doesn't exist, create a file info struct
102  * and open a (VFS) file for the given inode.
108 	struct nlm_file	*file;
118 	/* Lock file table */
121 	hlist_for_each_entry(file, &nlm_files[hash], f_list)
122 		if (!nfs_compare_fh(&file->f_handle, &lock->fh)) {
123 			mutex_lock(&file->f_mutex);
124 			nfserr = nlm_do_fopen(rqstp, file, mode);
125 			mutex_unlock(&file->f_mutex);
128 	nlm_debug_print_fh("creating file for", &lock->fh);
131 	file = kzalloc(sizeof(*file), GFP_KERNEL);
132 	if (!file)
135 	memcpy(&file->f_handle, &lock->fh, sizeof(struct nfs_fh));
136 	mutex_init(&file->f_mutex);
137 	INIT_HLIST_NODE(&file->f_list);
138 	INIT_LIST_HEAD(&file->f_blocks);
140 	nfserr = nlm_do_fopen(rqstp, file, mode);
144 	hlist_add_head(&file->f_list, &nlm_files[hash]);
147 	dprintk("lockd: found file %p (count %d)\n", file, file->f_count);
148 	*result = file;
149 	file->f_count++;
156 	kfree(file);
161  * Delete a file after having released all locks, blocks and shares
164 nlm_delete_file(struct nlm_file *file)
166 	nlm_debug_print_file("closing file", file);
167 	if (!hlist_unhashed(&file->f_list)) {
168 		hlist_del(&file->f_list);
169 		if (file->f_file[O_RDONLY])
170 			nlmsvc_ops->fclose(file->f_file[O_RDONLY]);
171 		if (file->f_file[O_WRONLY])
172 			nlmsvc_ops->fclose(file->f_file[O_WRONLY]);
173 		kfree(file);
175 		printk(KERN_WARNING "lockd: attempt to release unknown file!\n");
179 static int nlm_unlock_files(struct nlm_file *file, const struct file_lock *fl)
191 	lock.c.flc_file = file->f_file[O_RDONLY];
194 	lock.c.flc_file = file->f_file[O_WRONLY];
204  * Loop over all locks on the given file and perform the specified
208 nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file,
211 	struct inode	 *inode = nlmsvc_file_inode(file);
219 	file->f_locks = 0;
226 		file->f_locks++;
232 			if (nlm_unlock_files(file, fl))
249  * Inspect a single file
252 nlm_inspect_file(struct nlm_host *host, struct nlm_file *file, nlm_host_match_fn_t match)
254 	nlmsvc_traverse_blocks(host, file, match);
255 	nlmsvc_traverse_shares(host, file, match);
256 	return nlm_traverse_locks(host, file, match);
261  * shares on a given file.
264 nlm_file_inuse(struct nlm_file *file)
266 	struct inode	 *inode = nlmsvc_file_inode(file);
270 	if (file->f_count || !list_empty(&file->f_blocks) || file->f_shares)
283 	file->f_locks = 0;
287 static void nlm_close_files(struct nlm_file *file)
289 	if (file->f_file[O_RDONLY])
290 		nlmsvc_ops->fclose(file->f_file[O_RDONLY]);
291 	if (file->f_file[O_WRONLY])
292 		nlmsvc_ops->fclose(file->f_file[O_WRONLY]);
296  * Loop over all files in the file table.
300 		int (*is_failover_file)(void *data, struct nlm_file *file))
303 	struct nlm_file	*file;
308 		hlist_for_each_entry_safe(file, next, &nlm_files[i], f_list) {
309 			if (is_failover_file && !is_failover_file(data, file))
311 			file->f_count++;
314 			/* Traverse locks, blocks and shares of this file
315 			 * and update file->f_locks count */
316 			if (nlm_inspect_file(data, file, match))
320 			file->f_count--;
321 			/* No more references to this file. Let go of it. */
322 			if (list_empty(&file->f_blocks) && !file->f_locks
323 			 && !file->f_shares && !file->f_count) {
324 				hlist_del(&file->f_list);
325 				nlm_close_files(file);
326 				kfree(file);
335  * Release file. If there are no more remote locks on this file,
344 nlm_release_file(struct nlm_file *file)
347 				file, file->f_count);
349 	/* Lock file table */
352 	/* If there are no more locks etc, delete the file */
353 	if (--file->f_count == 0 && !nlm_file_inuse(file))
354 		nlm_delete_file(file);
461 nlmsvc_match_sb(void *datap, struct nlm_file *file)
465 	return sb == nlmsvc_file_inode(file)->i_sb;
469  * nlmsvc_unlock_all_by_sb - release locks held on this file system
472  * Release all locks held by clients accessing this file system.