This adds pathname lookup routine nilfs_search_path(), which makes up a full pathname of a given inode number tracking namespace upward from the inode to the root directory with the parent inode number added to each inode.
Signed-off-by: Ryusuke Konishi <[email protected]> --- fs/nilfs2/namei.c | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++++ fs/nilfs2/nilfs.h | 5 +++ 2 files changed, 97 insertions(+), 0 deletions(-) diff --git a/fs/nilfs2/namei.c b/fs/nilfs2/namei.c index 16bfa37..320e5d3 100644 --- a/fs/nilfs2/namei.c +++ b/fs/nilfs2/namei.c @@ -455,6 +455,98 @@ out: return err; } +/** + * nilfs_search_path - lookup path of inode in a past checkpoint tree + * @sb: super block instance + * @root: root object + * @ino: inode number + * @parent_index: parent index number + * @buf: buffer in which a pathname to be stored + * @bufsz: size of @buf + * @namesz: buffer to store size of the acquired pathname + */ +ssize_t nilfs_search_path(struct super_block *sb, struct nilfs_root *root, + ino_t ino, int parent_index, + char *buf, size_t bufsz, size_t *namesz) +{ + struct inode *inode, *parent; + struct nilfs_dir_entry *de; + struct page *page; + ssize_t ret; + size_t namelen; + char *cp; + + inode = nilfs_iget(sb, root, ino); + if (IS_ERR(inode)) { + ret = PTR_ERR(inode); + if (ret == -EINVAL) + ret = -ENOENT; + goto out; + } + + cp = buf + bufsz - 1; + if (cp - 1 < buf) { + /* at least the root directory needs one more character */ + ret = -ENAMETOOLONG; + goto out_iput; + } + *cp = '\0'; /* end of a pathname */ + ret = 1; + + if (inode->i_ino == NILFS_ROOT_INO) { + *--cp = '/'; + goto out_iput; + } + + do { + if (!NILFS_I(inode)->i_parent_ino) { + ret = -ENOENT; + break; + } + + parent = nilfs_iget(sb, root, + NILFS_I(inode)->i_parent_ino); + if (IS_ERR(parent)) { + ret = PTR_ERR(parent); + if (ret == -EINVAL) + ret = -ENOENT; + break; + } + + de = nilfs_find_entry_by_ino(parent, inode->i_ino, &page); + if (!de) { + iput(parent); + ret = -ENOENT; + break; + } + + namelen = de->name_len; + if (cp - (namelen + 1) < buf) { + kunmap(page); + page_cache_release(page); + iput(parent); + ret = -ENAMETOOLONG; + break; + } + cp -= namelen; + memcpy(cp, de->name, namelen); + *--cp = '/'; + kunmap(page); + page_cache_release(page); + + iput(inode); + inode = parent; + + } while (inode->i_ino != NILFS_ROOT_INO); + +out_iput: + iput(inode); + if (ret >= 0) + *namesz = buf + bufsz - cp; +out: + return ret; +} + /* * Export operations */ diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h index 1e47669..e8e97c2 100644 --- a/fs/nilfs2/nilfs.h +++ b/fs/nilfs2/nilfs.h @@ -237,6 +237,11 @@ extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **); extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *, struct page *, struct inode *); +/* namei.c */ +ssize_t nilfs_search_path(struct super_block *sb, struct nilfs_root *root, + ino_t ino, int parent_index, + char *buf, size_t bufsz, size_t *namesz); + /* file.c */ extern int nilfs_sync_file(struct file *, int); -- 1.7.3.5 -- To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
