linux-master/fs/d_path.c

84  * With RCU path tracing, it may race with d_move(). Use READ_ONCE() to
105 			  const struct path *root, struct prepend_buffer *p)
141  * prepend_path - Prepend path string to a buffer
142  * @path: the dentry/vfsmount to report
156 static int prepend_path(const struct path *path,
157 			const struct path *root,
172 	error = __prepend_path(path->dentry, real_mount(path->mnt), root, &b);
200  * __d_path - return the path of a dentry
201  * @path: the dentry/vfsmount to report
206  * Convert a dentry into an ASCII path name.
209  * path was too long.
213  * If the path is not reachable from the supplied root, return %NULL.
215 char *__d_path(const struct path *path,
216 	       const struct path *root,
222 	if (unlikely(prepend_path(path, root, &b) > 0))
227 char *d_absolute_path(const struct path *path,
230 	struct path root = {};
234 	if (unlikely(prepend_path(path, &root, &b) > 1))
239 static void get_fs_root_rcu(struct fs_struct *fs, struct path *root)
250  * d_path - return the path of a dentry
251  * @path: path to report
255  * Convert a dentry into an ASCII path name. If the entry has been deleted
258  * Returns a pointer into the buffer or an error code if the path was
265 char *d_path(const struct path *path, char *buf, int buflen)
268 	struct path root;
278 	 * path->dentry == path->mnt->mnt_root.  In that case don't call d_dname
279 	 * and instead have d_path return the mounted path.
281 	if (path->dentry->d_op && path->dentry->d_op->d_dname &&
282 	    (!IS_ROOT(path->dentry) || path->dentry != path->mnt->mnt_root))
283 		return path->dentry->d_op->d_dname(path->dentry, buf, buflen);
287 	if (unlikely(d_unlinked(path->dentry)))
291 	prepend_path(path, &root, &b);
382 static void get_fs_root_and_pwd_rcu(struct fs_struct *fs, struct path *root,
383 				    struct path *pwd)
415 	struct path pwd, root;