linux-master/fs/fsopen.c

27 	struct fs_context *fc = file->private_data;
28 	struct fc_log *log = fc->log.log;
35 	ret = mutex_lock_interruptible(&fc->uapi_mutex);
40 		mutex_unlock(&fc->uapi_mutex);
50 	mutex_unlock(&fc->uapi_mutex);
69 	struct fs_context *fc = file->private_data;
71 	if (fc) {
73 		put_fs_context(fc);
87 static int fscontext_create_fd(struct fs_context *fc, unsigned int o_flags)
91 	fd = anon_inode_getfd("[fscontext]", &fscontext_fops, fc,
94 		put_fs_context(fc);
98 static int fscontext_alloc_log(struct fs_context *fc)
100 	fc->log.log = kzalloc(sizeof(*fc->log.log), GFP_KERNEL);
101 	if (!fc->log.log)
103 	refcount_set(&fc->log.log->usage, 1);
104 	fc->log.log->owner = fc->fs_type->owner;
118 	struct fs_context *fc;
137 	fc = fs_context_for_mount(fs_type, 0);
139 	if (IS_ERR(fc))
140 		return PTR_ERR(fc);
142 	fc->phase = FS_CONTEXT_CREATE_PARAMS;
144 	ret = fscontext_alloc_log(fc);
148 	return fscontext_create_fd(fc, flags & FSOPEN_CLOEXEC ? O_CLOEXEC : 0);
151 	put_fs_context(fc);
160 	struct fs_context *fc;
189 	fc = fs_context_for_reconfigure(target.dentry, 0, 0);
190 	if (IS_ERR(fc)) {
191 		ret = PTR_ERR(fc);
195 	fc->phase = FS_CONTEXT_RECONF_PARAMS;
197 	ret = fscontext_alloc_log(fc);
202 	return fscontext_create_fd(fc, flags & FSPICK_CLOEXEC ? O_CLOEXEC : 0);
205 	put_fs_context(fc);
212 static int vfs_cmd_create(struct fs_context *fc, bool exclusive)
217 	if (fc->phase != FS_CONTEXT_CREATE_PARAMS)
220 	if (!mount_capable(fc))
224 	if (exclusive && fc->ops == &legacy_fs_context_ops)
227 	fc->phase = FS_CONTEXT_CREATING;
228 	fc->exclusive = exclusive;
230 	ret = vfs_get_tree(fc);
232 		fc->phase = FS_CONTEXT_FAILED;
236 	sb = fc->root->d_sb;
239 		fc_drop_locked(fc);
240 		fc->phase = FS_CONTEXT_FAILED;
246 	fc->phase = FS_CONTEXT_AWAITING_MOUNT;
250 static int vfs_cmd_reconfigure(struct fs_context *fc)
255 	if (fc->phase != FS_CONTEXT_RECONF_PARAMS)
258 	fc->phase = FS_CONTEXT_RECONFIGURING;
260 	sb = fc->root->d_sb;
262 		fc->phase = FS_CONTEXT_FAILED;
267 	ret = reconfigure_super(fc);
270 		fc->phase = FS_CONTEXT_FAILED;
274 	vfs_clean_context(fc);
282 static int vfs_fsconfig_locked(struct fs_context *fc, int cmd,
287 	ret = finish_clean_context(fc);
292 		return vfs_cmd_create(fc, false);
294 		return vfs_cmd_create(fc, true);
296 		return vfs_cmd_reconfigure(fc);
298 		if (fc->phase != FS_CONTEXT_CREATE_PARAMS &&
299 		    fc->phase != FS_CONTEXT_RECONF_PARAMS)
302 		return vfs_parse_fs_param(fc, param);
356 	struct fs_context *fc;
407 	fc = f.file->private_data;
408 	if (fc->ops == &legacy_fs_context_ops) {
474 	ret = mutex_lock_interruptible(&fc->uapi_mutex);
476 		ret = vfs_fsconfig_locked(fc, cmd, &param);
477 		mutex_unlock(&fc->uapi_mutex);