574 lines
13 KiB
C
574 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* NILFS pathname lookup operations.
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*
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* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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*
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* Modified for NILFS by Amagai Yoshiji and Ryusuke Konishi.
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*/
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/*
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* linux/fs/ext2/namei.c
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/fs/minix/namei.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* Big-endian to little-endian byte-swapping/bitmaps by
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* David S. Miller (davem@caip.rutgers.edu), 1995
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*/
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#include <linux/pagemap.h>
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#include "nilfs.h"
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#include "export.h"
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#define NILFS_FID_SIZE_NON_CONNECTABLE \
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(offsetof(struct nilfs_fid, parent_gen) / 4)
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#define NILFS_FID_SIZE_CONNECTABLE (sizeof(struct nilfs_fid) / 4)
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static inline int nilfs_add_nondir(struct dentry *dentry, struct inode *inode)
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{
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int err = nilfs_add_link(dentry, inode);
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if (!err) {
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d_instantiate_new(dentry, inode);
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return 0;
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}
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inode_dec_link_count(inode);
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unlock_new_inode(inode);
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iput(inode);
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return err;
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}
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/*
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* Methods themselves.
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*/
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static struct dentry *
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nilfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
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{
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struct inode *inode;
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ino_t ino;
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if (dentry->d_name.len > NILFS_NAME_LEN)
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return ERR_PTR(-ENAMETOOLONG);
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ino = nilfs_inode_by_name(dir, &dentry->d_name);
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inode = ino ? nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino) : NULL;
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return d_splice_alias(inode, dentry);
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}
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/*
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* By the time this is called, we already have created
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* the directory cache entry for the new file, but it
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* is so far negative - it has no inode.
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*
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* If the create succeeds, we fill in the inode information
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* with d_instantiate().
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*/
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static int nilfs_create(struct mnt_idmap *idmap, struct inode *dir,
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struct dentry *dentry, umode_t mode, bool excl)
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{
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struct inode *inode;
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struct nilfs_transaction_info ti;
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int err;
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err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
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if (err)
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return err;
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inode = nilfs_new_inode(dir, mode);
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err = PTR_ERR(inode);
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if (!IS_ERR(inode)) {
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inode->i_op = &nilfs_file_inode_operations;
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inode->i_fop = &nilfs_file_operations;
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inode->i_mapping->a_ops = &nilfs_aops;
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nilfs_mark_inode_dirty(inode);
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err = nilfs_add_nondir(dentry, inode);
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}
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if (!err)
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err = nilfs_transaction_commit(dir->i_sb);
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else
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nilfs_transaction_abort(dir->i_sb);
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return err;
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}
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static int
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nilfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
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struct dentry *dentry, umode_t mode, dev_t rdev)
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{
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struct inode *inode;
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struct nilfs_transaction_info ti;
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int err;
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err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
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if (err)
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return err;
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inode = nilfs_new_inode(dir, mode);
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err = PTR_ERR(inode);
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if (!IS_ERR(inode)) {
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init_special_inode(inode, inode->i_mode, rdev);
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nilfs_mark_inode_dirty(inode);
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err = nilfs_add_nondir(dentry, inode);
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}
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if (!err)
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err = nilfs_transaction_commit(dir->i_sb);
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else
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nilfs_transaction_abort(dir->i_sb);
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return err;
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}
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static int nilfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
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struct dentry *dentry, const char *symname)
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{
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struct nilfs_transaction_info ti;
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struct super_block *sb = dir->i_sb;
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unsigned int l = strlen(symname) + 1;
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struct inode *inode;
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int err;
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if (l > sb->s_blocksize)
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return -ENAMETOOLONG;
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err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
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if (err)
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return err;
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inode = nilfs_new_inode(dir, S_IFLNK | 0777);
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err = PTR_ERR(inode);
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if (IS_ERR(inode))
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goto out;
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/* slow symlink */
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inode->i_op = &nilfs_symlink_inode_operations;
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inode_nohighmem(inode);
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inode->i_mapping->a_ops = &nilfs_aops;
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err = page_symlink(inode, symname, l);
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if (err)
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goto out_fail;
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/* mark_inode_dirty(inode); */
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/* page_symlink() do this */
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err = nilfs_add_nondir(dentry, inode);
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out:
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if (!err)
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err = nilfs_transaction_commit(dir->i_sb);
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else
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nilfs_transaction_abort(dir->i_sb);
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return err;
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out_fail:
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drop_nlink(inode);
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nilfs_mark_inode_dirty(inode);
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unlock_new_inode(inode);
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iput(inode);
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goto out;
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}
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static int nilfs_link(struct dentry *old_dentry, struct inode *dir,
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struct dentry *dentry)
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{
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struct inode *inode = d_inode(old_dentry);
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struct nilfs_transaction_info ti;
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int err;
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err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
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if (err)
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return err;
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inode->i_ctime = current_time(inode);
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inode_inc_link_count(inode);
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ihold(inode);
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err = nilfs_add_link(dentry, inode);
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if (!err) {
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d_instantiate(dentry, inode);
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err = nilfs_transaction_commit(dir->i_sb);
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} else {
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inode_dec_link_count(inode);
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iput(inode);
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nilfs_transaction_abort(dir->i_sb);
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}
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return err;
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}
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static int nilfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
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struct dentry *dentry, umode_t mode)
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{
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struct inode *inode;
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struct nilfs_transaction_info ti;
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int err;
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err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
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if (err)
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return err;
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inc_nlink(dir);
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inode = nilfs_new_inode(dir, S_IFDIR | mode);
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err = PTR_ERR(inode);
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if (IS_ERR(inode))
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goto out_dir;
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inode->i_op = &nilfs_dir_inode_operations;
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inode->i_fop = &nilfs_dir_operations;
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inode->i_mapping->a_ops = &nilfs_aops;
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inc_nlink(inode);
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err = nilfs_make_empty(inode, dir);
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if (err)
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goto out_fail;
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err = nilfs_add_link(dentry, inode);
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if (err)
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goto out_fail;
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nilfs_mark_inode_dirty(inode);
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d_instantiate_new(dentry, inode);
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out:
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if (!err)
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err = nilfs_transaction_commit(dir->i_sb);
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else
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nilfs_transaction_abort(dir->i_sb);
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return err;
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out_fail:
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drop_nlink(inode);
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drop_nlink(inode);
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nilfs_mark_inode_dirty(inode);
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unlock_new_inode(inode);
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iput(inode);
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out_dir:
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drop_nlink(dir);
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nilfs_mark_inode_dirty(dir);
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goto out;
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}
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static int nilfs_do_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct inode *inode;
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struct nilfs_dir_entry *de;
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struct page *page;
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int err;
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err = -ENOENT;
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de = nilfs_find_entry(dir, &dentry->d_name, &page);
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if (!de)
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goto out;
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inode = d_inode(dentry);
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err = -EIO;
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if (le64_to_cpu(de->inode) != inode->i_ino)
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goto out;
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if (!inode->i_nlink) {
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nilfs_warn(inode->i_sb,
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"deleting nonexistent file (ino=%lu), %d",
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inode->i_ino, inode->i_nlink);
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set_nlink(inode, 1);
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}
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err = nilfs_delete_entry(de, page);
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if (err)
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goto out;
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inode->i_ctime = dir->i_ctime;
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drop_nlink(inode);
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err = 0;
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out:
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return err;
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}
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static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct nilfs_transaction_info ti;
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int err;
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err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
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if (err)
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return err;
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err = nilfs_do_unlink(dir, dentry);
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if (!err) {
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nilfs_mark_inode_dirty(dir);
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nilfs_mark_inode_dirty(d_inode(dentry));
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err = nilfs_transaction_commit(dir->i_sb);
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} else
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nilfs_transaction_abort(dir->i_sb);
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return err;
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}
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static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
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{
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struct inode *inode = d_inode(dentry);
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struct nilfs_transaction_info ti;
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int err;
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err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
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if (err)
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return err;
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err = -ENOTEMPTY;
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if (nilfs_empty_dir(inode)) {
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err = nilfs_do_unlink(dir, dentry);
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if (!err) {
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inode->i_size = 0;
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drop_nlink(inode);
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nilfs_mark_inode_dirty(inode);
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drop_nlink(dir);
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nilfs_mark_inode_dirty(dir);
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}
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}
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if (!err)
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err = nilfs_transaction_commit(dir->i_sb);
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else
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nilfs_transaction_abort(dir->i_sb);
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return err;
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}
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static int nilfs_rename(struct mnt_idmap *idmap,
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struct inode *old_dir, struct dentry *old_dentry,
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struct inode *new_dir, struct dentry *new_dentry,
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unsigned int flags)
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{
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struct inode *old_inode = d_inode(old_dentry);
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struct inode *new_inode = d_inode(new_dentry);
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struct page *dir_page = NULL;
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struct nilfs_dir_entry *dir_de = NULL;
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struct page *old_page;
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struct nilfs_dir_entry *old_de;
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struct nilfs_transaction_info ti;
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int err;
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if (flags & ~RENAME_NOREPLACE)
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return -EINVAL;
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err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
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if (unlikely(err))
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return err;
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err = -ENOENT;
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old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page);
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if (!old_de)
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goto out;
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if (S_ISDIR(old_inode->i_mode)) {
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err = -EIO;
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dir_de = nilfs_dotdot(old_inode, &dir_page);
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if (!dir_de)
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goto out_old;
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}
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if (new_inode) {
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struct page *new_page;
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struct nilfs_dir_entry *new_de;
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err = -ENOTEMPTY;
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if (dir_de && !nilfs_empty_dir(new_inode))
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goto out_dir;
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err = -ENOENT;
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new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page);
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if (!new_de)
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goto out_dir;
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|
|
nilfs_set_link(new_dir, new_de, new_page, old_inode);
|
||
|
|
nilfs_mark_inode_dirty(new_dir);
|
||
|
|
new_inode->i_ctime = current_time(new_inode);
|
||
|
|
if (dir_de)
|
||
|
|
drop_nlink(new_inode);
|
||
|
|
drop_nlink(new_inode);
|
||
|
|
nilfs_mark_inode_dirty(new_inode);
|
||
|
|
} else {
|
||
|
|
err = nilfs_add_link(new_dentry, old_inode);
|
||
|
|
if (err)
|
||
|
|
goto out_dir;
|
||
|
|
if (dir_de) {
|
||
|
|
inc_nlink(new_dir);
|
||
|
|
nilfs_mark_inode_dirty(new_dir);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Like most other Unix systems, set the ctime for inodes on a
|
||
|
|
* rename.
|
||
|
|
*/
|
||
|
|
old_inode->i_ctime = current_time(old_inode);
|
||
|
|
|
||
|
|
nilfs_delete_entry(old_de, old_page);
|
||
|
|
|
||
|
|
if (dir_de) {
|
||
|
|
nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
|
||
|
|
drop_nlink(old_dir);
|
||
|
|
}
|
||
|
|
nilfs_mark_inode_dirty(old_dir);
|
||
|
|
nilfs_mark_inode_dirty(old_inode);
|
||
|
|
|
||
|
|
err = nilfs_transaction_commit(old_dir->i_sb);
|
||
|
|
return err;
|
||
|
|
|
||
|
|
out_dir:
|
||
|
|
if (dir_de) {
|
||
|
|
kunmap(dir_page);
|
||
|
|
put_page(dir_page);
|
||
|
|
}
|
||
|
|
out_old:
|
||
|
|
kunmap(old_page);
|
||
|
|
put_page(old_page);
|
||
|
|
out:
|
||
|
|
nilfs_transaction_abort(old_dir->i_sb);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Export operations
|
||
|
|
*/
|
||
|
|
static struct dentry *nilfs_get_parent(struct dentry *child)
|
||
|
|
{
|
||
|
|
unsigned long ino;
|
||
|
|
struct inode *inode;
|
||
|
|
struct nilfs_root *root;
|
||
|
|
|
||
|
|
ino = nilfs_inode_by_name(d_inode(child), &dotdot_name);
|
||
|
|
if (!ino)
|
||
|
|
return ERR_PTR(-ENOENT);
|
||
|
|
|
||
|
|
root = NILFS_I(d_inode(child))->i_root;
|
||
|
|
|
||
|
|
inode = nilfs_iget(child->d_sb, root, ino);
|
||
|
|
if (IS_ERR(inode))
|
||
|
|
return ERR_CAST(inode);
|
||
|
|
|
||
|
|
return d_obtain_alias(inode);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,
|
||
|
|
u64 ino, u32 gen)
|
||
|
|
{
|
||
|
|
struct nilfs_root *root;
|
||
|
|
struct inode *inode;
|
||
|
|
|
||
|
|
if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
|
||
|
|
return ERR_PTR(-ESTALE);
|
||
|
|
|
||
|
|
root = nilfs_lookup_root(sb->s_fs_info, cno);
|
||
|
|
if (!root)
|
||
|
|
return ERR_PTR(-ESTALE);
|
||
|
|
|
||
|
|
inode = nilfs_iget(sb, root, ino);
|
||
|
|
nilfs_put_root(root);
|
||
|
|
|
||
|
|
if (IS_ERR(inode))
|
||
|
|
return ERR_CAST(inode);
|
||
|
|
if (gen && inode->i_generation != gen) {
|
||
|
|
iput(inode);
|
||
|
|
return ERR_PTR(-ESTALE);
|
||
|
|
}
|
||
|
|
return d_obtain_alias(inode);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
|
||
|
|
int fh_len, int fh_type)
|
||
|
|
{
|
||
|
|
struct nilfs_fid *fid = (struct nilfs_fid *)fh;
|
||
|
|
|
||
|
|
if (fh_len < NILFS_FID_SIZE_NON_CONNECTABLE ||
|
||
|
|
(fh_type != FILEID_NILFS_WITH_PARENT &&
|
||
|
|
fh_type != FILEID_NILFS_WITHOUT_PARENT))
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh,
|
||
|
|
int fh_len, int fh_type)
|
||
|
|
{
|
||
|
|
struct nilfs_fid *fid = (struct nilfs_fid *)fh;
|
||
|
|
|
||
|
|
if (fh_len < NILFS_FID_SIZE_CONNECTABLE ||
|
||
|
|
fh_type != FILEID_NILFS_WITH_PARENT)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int nilfs_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
|
||
|
|
struct inode *parent)
|
||
|
|
{
|
||
|
|
struct nilfs_fid *fid = (struct nilfs_fid *)fh;
|
||
|
|
struct nilfs_root *root = NILFS_I(inode)->i_root;
|
||
|
|
int type;
|
||
|
|
|
||
|
|
if (parent && *lenp < NILFS_FID_SIZE_CONNECTABLE) {
|
||
|
|
*lenp = NILFS_FID_SIZE_CONNECTABLE;
|
||
|
|
return FILEID_INVALID;
|
||
|
|
}
|
||
|
|
if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE) {
|
||
|
|
*lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
|
||
|
|
return FILEID_INVALID;
|
||
|
|
}
|
||
|
|
|
||
|
|
fid->cno = root->cno;
|
||
|
|
fid->ino = inode->i_ino;
|
||
|
|
fid->gen = inode->i_generation;
|
||
|
|
|
||
|
|
if (parent) {
|
||
|
|
fid->parent_ino = parent->i_ino;
|
||
|
|
fid->parent_gen = parent->i_generation;
|
||
|
|
type = FILEID_NILFS_WITH_PARENT;
|
||
|
|
*lenp = NILFS_FID_SIZE_CONNECTABLE;
|
||
|
|
} else {
|
||
|
|
type = FILEID_NILFS_WITHOUT_PARENT;
|
||
|
|
*lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
|
||
|
|
}
|
||
|
|
|
||
|
|
return type;
|
||
|
|
}
|
||
|
|
|
||
|
|
const struct inode_operations nilfs_dir_inode_operations = {
|
||
|
|
.create = nilfs_create,
|
||
|
|
.lookup = nilfs_lookup,
|
||
|
|
.link = nilfs_link,
|
||
|
|
.unlink = nilfs_unlink,
|
||
|
|
.symlink = nilfs_symlink,
|
||
|
|
.mkdir = nilfs_mkdir,
|
||
|
|
.rmdir = nilfs_rmdir,
|
||
|
|
.mknod = nilfs_mknod,
|
||
|
|
.rename = nilfs_rename,
|
||
|
|
.setattr = nilfs_setattr,
|
||
|
|
.permission = nilfs_permission,
|
||
|
|
.fiemap = nilfs_fiemap,
|
||
|
|
.fileattr_get = nilfs_fileattr_get,
|
||
|
|
.fileattr_set = nilfs_fileattr_set,
|
||
|
|
};
|
||
|
|
|
||
|
|
const struct inode_operations nilfs_special_inode_operations = {
|
||
|
|
.setattr = nilfs_setattr,
|
||
|
|
.permission = nilfs_permission,
|
||
|
|
};
|
||
|
|
|
||
|
|
const struct inode_operations nilfs_symlink_inode_operations = {
|
||
|
|
.get_link = page_get_link,
|
||
|
|
.permission = nilfs_permission,
|
||
|
|
};
|
||
|
|
|
||
|
|
const struct export_operations nilfs_export_ops = {
|
||
|
|
.encode_fh = nilfs_encode_fh,
|
||
|
|
.fh_to_dentry = nilfs_fh_to_dentry,
|
||
|
|
.fh_to_parent = nilfs_fh_to_parent,
|
||
|
|
.get_parent = nilfs_get_parent,
|
||
|
|
};
|