27  * Global file hash table
45 static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)  in nlm_debug_print_file()  argument
47 	struct inode *inode = locks_inode(file->f_file);  in nlm_debug_print_file()
58 static inline void nlm_debug_print_file(char *msg, struct nlm_file *file)  in nlm_debug_print_file()  argument
74  * Lookup file info. If it doesn't exist, create a file info struct
75  * and open a (VFS) file for the given inode.
78  * Note that we open the file O_RDONLY even when creating write locks.
86 	struct nlm_file	*file;  in nlm_lookup_file()  local
94 	/* Lock file table */  in nlm_lookup_file()
97 	hlist_for_each_entry(file, &nlm_files[hash], f_list)  in nlm_lookup_file()
98 		if (!nfs_compare_fh(&file->f_handle, f))  in nlm_lookup_file()
101 	nlm_debug_print_fh("creating file for", f);  in nlm_lookup_file()
104 	file = kzalloc(sizeof(*file), GFP_KERNEL);  in nlm_lookup_file()
105 	if (!file)  in nlm_lookup_file()
108 	memcpy(&file->f_handle, f, sizeof(struct nfs_fh));  in nlm_lookup_file()
109 	mutex_init(&file->f_mutex);  in nlm_lookup_file()
110 	INIT_HLIST_NODE(&file->f_list);  in nlm_lookup_file()
111 	INIT_LIST_HEAD(&file->f_blocks);  in nlm_lookup_file()
113 	/* Open the file. Note that this must not sleep for too long, else  in nlm_lookup_file()
117 	 * the file.  in nlm_lookup_file()
119 	if ((nfserr = nlmsvc_ops->fopen(rqstp, f, &file->f_file)) != 0) {  in nlm_lookup_file()
124 	hlist_add_head(&file->f_list, &nlm_files[hash]);  in nlm_lookup_file()
127 	dprintk("lockd: found file %p (count %d)\n", file, file->f_count);  in nlm_lookup_file()
128 	*result = file;  in nlm_lookup_file()
129 	file->f_count++;  in nlm_lookup_file()
137 	kfree(file);  in nlm_lookup_file()
142  * Delete a file after having released all locks, blocks and shares
145 nlm_delete_file(struct nlm_file *file)  in nlm_delete_file()  argument
147 	nlm_debug_print_file("closing file", file);  in nlm_delete_file()
148 	if (!hlist_unhashed(&file->f_list)) {  in nlm_delete_file()
149 		hlist_del(&file->f_list);  in nlm_delete_file()
150 		nlmsvc_ops->fclose(file->f_file);  in nlm_delete_file()
151 		kfree(file);  in nlm_delete_file()
153 		printk(KERN_WARNING "lockd: attempt to release unknown file!\n");  in nlm_delete_file()
158  * Loop over all locks on the given file and perform the specified
162 nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file,  in nlm_traverse_locks()  argument
165 	struct inode	 *inode = nlmsvc_file_inode(file);  in nlm_traverse_locks()
173 	file->f_locks = 0;  in nlm_traverse_locks()
180 		file->f_locks++;  in nlm_traverse_locks()
190 			if (vfs_lock_file(file->f_file, F_SETLK, &lock, NULL) < 0) {  in nlm_traverse_locks()
210  * Inspect a single file
213 nlm_inspect_file(struct nlm_host *host, struct nlm_file *file, nlm_host_match_fn_t match)  in nlm_inspect_file()  argument
215 	nlmsvc_traverse_blocks(host, file, match);  in nlm_inspect_file()
216 	nlmsvc_traverse_shares(host, file, match);  in nlm_inspect_file()
217 	return nlm_traverse_locks(host, file, match);  in nlm_inspect_file()
222  * shares on a given file.
225 nlm_file_inuse(struct nlm_file *file)  in nlm_file_inuse()  argument
227 	struct inode	 *inode = nlmsvc_file_inode(file);  in nlm_file_inuse()
231 	if (file->f_count || !list_empty(&file->f_blocks) || file->f_shares)  in nlm_file_inuse()
244 	file->f_locks = 0;  in nlm_file_inuse()
249  * Loop over all files in the file table.
253 		int (*is_failover_file)(void *data, struct nlm_file *file))  in nlm_traverse_files()  argument
256 	struct nlm_file	*file;  in nlm_traverse_files()  local
261 		hlist_for_each_entry_safe(file, next, &nlm_files[i], f_list) {  in nlm_traverse_files()
262 			if (is_failover_file && !is_failover_file(data, file))  in nlm_traverse_files()
264 			file->f_count++;  in nlm_traverse_files()
267 			/* Traverse locks, blocks and shares of this file  in nlm_traverse_files()
268 			 * and update file->f_locks count */  in nlm_traverse_files()
269 			if (nlm_inspect_file(data, file, match))  in nlm_traverse_files()
273 			file->f_count--;  in nlm_traverse_files()
274 			/* No more references to this file. Let go of it. */  in nlm_traverse_files()
275 			if (list_empty(&file->f_blocks) && !file->f_locks  in nlm_traverse_files()
276 			 && !file->f_shares && !file->f_count) {  in nlm_traverse_files()
277 				hlist_del(&file->f_list);  in nlm_traverse_files()
278 				nlmsvc_ops->fclose(file->f_file);  in nlm_traverse_files()
279 				kfree(file);  in nlm_traverse_files()
288  * Release file. If there are no more remote locks on this file,
297 nlm_release_file(struct nlm_file *file)  in nlm_release_file()  argument
300 				file, file->f_count);  in nlm_release_file()
302 	/* Lock file table */  in nlm_release_file()
305 	/* If there are no more locks etc, delete the file */  in nlm_release_file()
306 	if (--file->f_count == 0 && !nlm_file_inuse(file))  in nlm_release_file()
307 		nlm_delete_file(file);  in nlm_release_file()
413 nlmsvc_match_sb(void *datap, struct nlm_file *file)  in nlmsvc_match_sb()  argument
417 	return sb == locks_inode(file->f_file)->i_sb;  in nlmsvc_match_sb()
421  * nlmsvc_unlock_all_by_sb - release locks held on this file system
424  * Release all locks held by clients accessing this file system.