28  * Global file hash table
46 static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)  in nlm_debug_print_file()  argument
48 	struct inode *inode = nlmsvc_file_inode(file);  in nlm_debug_print_file()
59 static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)  in nlm_debug_print_file()  argument
80  * Open the file. Note that if we're reexporting, for example,
84  * the file.
87 			   struct nlm_file *file, int mode)  in nlm_do_fopen()  argument
89 	struct file **fp = &file->f_file[mode];  in nlm_do_fopen()
94 	nfserr = nlmsvc_ops->fopen(rqstp, &file->f_handle, fp, mode);  in nlm_do_fopen()
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;  in nlm_lookup_file()  local
118 	/* Lock file table */  in nlm_lookup_file()
121 	hlist_for_each_entry(file, &nlm_files[hash], f_list)  in nlm_lookup_file()
122 		if (!nfs_compare_fh(&file->f_handle, &lock->fh)) {  in nlm_lookup_file()
123 			mutex_lock(&file->f_mutex);  in nlm_lookup_file()
124 			nfserr = nlm_do_fopen(rqstp, file, mode);  in nlm_lookup_file()
125 			mutex_unlock(&file->f_mutex);  in nlm_lookup_file()
128 	nlm_debug_print_fh("creating file for", &lock->fh);  in nlm_lookup_file()
131 	file = kzalloc(sizeof(*file), GFP_KERNEL);  in nlm_lookup_file()
132 	if (!file)  in nlm_lookup_file()
135 	memcpy(&file->f_handle, &lock->fh, sizeof(struct nfs_fh));  in nlm_lookup_file()
136 	mutex_init(&file->f_mutex);  in nlm_lookup_file()
137 	INIT_HLIST_NODE(&file->f_list);  in nlm_lookup_file()
138 	INIT_LIST_HEAD(&file->f_blocks);  in nlm_lookup_file()
140 	nfserr = nlm_do_fopen(rqstp, file, mode);  in nlm_lookup_file()
144 	hlist_add_head(&file->f_list, &nlm_files[hash]);  in nlm_lookup_file()
147 	dprintk("lockd: found file %p (count %d)\n", file, file->f_count);  in nlm_lookup_file()
148 	*result = file;  in nlm_lookup_file()
149 	file->f_count++;  in nlm_lookup_file()
156 	kfree(file);  in nlm_lookup_file()
161  * Delete a file after having released all locks, blocks and shares
164 nlm_delete_file(struct nlm_file *file)  in nlm_delete_file()  argument
166 	nlm_debug_print_file("closing file", file);  in nlm_delete_file()
167 	if (!hlist_unhashed(&file->f_list)) {  in nlm_delete_file()
168 		hlist_del(&file->f_list);  in nlm_delete_file()
169 		if (file->f_file[O_RDONLY])  in nlm_delete_file()
170 			nlmsvc_ops->fclose(file->f_file[O_RDONLY]);  in nlm_delete_file()
171 		if (file->f_file[O_WRONLY])  in nlm_delete_file()
172 			nlmsvc_ops->fclose(file->f_file[O_WRONLY]);  in nlm_delete_file()
173 		kfree(file);  in nlm_delete_file()
175 		printk(KERN_WARNING "lockd: attempt to release unknown file!\n");  in nlm_delete_file()
179 static int nlm_unlock_files(struct nlm_file *file)  in nlm_unlock_files()  argument
182 	struct file *f;  in nlm_unlock_files()
187 	for (f = file->f_file[0]; f <= file->f_file[1]; f++) {  in nlm_unlock_files()
198  * Loop over all locks on the given file and perform the specified
202 nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file,  in nlm_traverse_locks()  argument
205 	struct inode	 *inode = nlmsvc_file_inode(file);  in nlm_traverse_locks()
213 	file->f_locks = 0;  in nlm_traverse_locks()
220 		file->f_locks++;  in nlm_traverse_locks()
226 			if (nlm_unlock_files(file))  in nlm_traverse_locks()
243  * Inspect a single file
246 nlm_inspect_file(struct nlm_host *host, struct nlm_file *file, nlm_host_match_fn_t match)  in nlm_inspect_file()  argument
248 	nlmsvc_traverse_blocks(host, file, match);  in nlm_inspect_file()
249 	nlmsvc_traverse_shares(host, file, match);  in nlm_inspect_file()
250 	return nlm_traverse_locks(host, file, match);  in nlm_inspect_file()
255  * shares on a given file.
258 nlm_file_inuse(struct nlm_file *file)  in nlm_file_inuse()  argument
260 	struct inode	 *inode = nlmsvc_file_inode(file);  in nlm_file_inuse()
264 	if (file->f_count || !list_empty(&file->f_blocks) || file->f_shares)  in nlm_file_inuse()
277 	file->f_locks = 0;  in nlm_file_inuse()
281 static void nlm_close_files(struct nlm_file *file)  in nlm_close_files()  argument
283 	struct file *f;  in nlm_close_files()
285 	for (f = file->f_file[0]; f <= file->f_file[1]; f++)  in nlm_close_files()
291  * Loop over all files in the file table.
295 		int (*is_failover_file)(void *data, struct nlm_file *file))  in nlm_traverse_files()  argument
298 	struct nlm_file	*file;  in nlm_traverse_files()  local
303 		hlist_for_each_entry_safe(file, next, &nlm_files[i], f_list) {  in nlm_traverse_files()
304 			if (is_failover_file && !is_failover_file(data, file))  in nlm_traverse_files()
306 			file->f_count++;  in nlm_traverse_files()
309 			/* Traverse locks, blocks and shares of this file  in nlm_traverse_files()
310 			 * and update file->f_locks count */  in nlm_traverse_files()
311 			if (nlm_inspect_file(data, file, match))  in nlm_traverse_files()
315 			file->f_count--;  in nlm_traverse_files()
316 			/* No more references to this file. Let go of it. */  in nlm_traverse_files()
317 			if (list_empty(&file->f_blocks) && !file->f_locks  in nlm_traverse_files()
318 			 && !file->f_shares && !file->f_count) {  in nlm_traverse_files()
319 				hlist_del(&file->f_list);  in nlm_traverse_files()
320 				nlm_close_files(file);  in nlm_traverse_files()
321 				kfree(file);  in nlm_traverse_files()
330  * Release file. If there are no more remote locks on this file,
339 nlm_release_file(struct nlm_file *file)  in nlm_release_file()  argument
342 				file, file->f_count);  in nlm_release_file()
344 	/* Lock file table */  in nlm_release_file()
347 	/* If there are no more locks etc, delete the file */  in nlm_release_file()
348 	if (--file->f_count == 0 && !nlm_file_inuse(file))  in nlm_release_file()
349 		nlm_delete_file(file);  in nlm_release_file()
456 nlmsvc_match_sb(void *datap, struct nlm_file *file)  in nlmsvc_match_sb()  argument
460 	return sb == nlmsvc_file_inode(file)->i_sb;  in nlmsvc_match_sb()
464  * nlmsvc_unlock_all_by_sb - release locks held on this file system
467  * Release all locks held by clients accessing this file system.