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573 lines
13 KiB
573 lines
13 KiB
// 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 ([email protected]) |
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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 ([email protected]), 1995 |
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*/ |
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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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|
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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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|
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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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/* |
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* Methods themselves. |
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*/ |
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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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/* |
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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 user_namespace *mnt_userns, 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 user_namespace *mnt_userns, 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 user_namespace *mnt_userns, 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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|
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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 user_namespace *mnt_userns, 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 user_namespace *mnt_userns, |
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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); |
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nilfs_mark_inode_dirty(new_dir); |
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new_inode->i_ctime = current_time(new_inode); |
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if (dir_de) |
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drop_nlink(new_inode); |
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drop_nlink(new_inode); |
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nilfs_mark_inode_dirty(new_inode); |
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} else { |
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err = nilfs_add_link(new_dentry, old_inode); |
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if (err) |
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goto out_dir; |
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if (dir_de) { |
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inc_nlink(new_dir); |
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nilfs_mark_inode_dirty(new_dir); |
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} |
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} |
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/* |
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* Like most other Unix systems, set the ctime for inodes on a |
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* rename. |
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*/ |
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old_inode->i_ctime = current_time(old_inode); |
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nilfs_delete_entry(old_de, old_page); |
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if (dir_de) { |
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nilfs_set_link(old_inode, dir_de, dir_page, new_dir); |
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drop_nlink(old_dir); |
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} |
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nilfs_mark_inode_dirty(old_dir); |
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nilfs_mark_inode_dirty(old_inode); |
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err = nilfs_transaction_commit(old_dir->i_sb); |
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return err; |
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out_dir: |
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if (dir_de) { |
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kunmap(dir_page); |
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put_page(dir_page); |
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} |
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out_old: |
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kunmap(old_page); |
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put_page(old_page); |
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out: |
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nilfs_transaction_abort(old_dir->i_sb); |
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return err; |
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} |
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/* |
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* Export operations |
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*/ |
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static struct dentry *nilfs_get_parent(struct dentry *child) |
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{ |
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unsigned long ino; |
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struct inode *inode; |
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struct nilfs_root *root; |
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ino = nilfs_inode_by_name(d_inode(child), &dotdot_name); |
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if (!ino) |
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return ERR_PTR(-ENOENT); |
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root = NILFS_I(d_inode(child))->i_root; |
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inode = nilfs_iget(child->d_sb, root, ino); |
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if (IS_ERR(inode)) |
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return ERR_CAST(inode); |
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return d_obtain_alias(inode); |
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} |
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static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno, |
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u64 ino, u32 gen) |
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{ |
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struct nilfs_root *root; |
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struct inode *inode; |
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if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO) |
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return ERR_PTR(-ESTALE); |
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root = nilfs_lookup_root(sb->s_fs_info, cno); |
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if (!root) |
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return ERR_PTR(-ESTALE); |
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inode = nilfs_iget(sb, root, ino); |
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nilfs_put_root(root); |
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if (IS_ERR(inode)) |
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return ERR_CAST(inode); |
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if (gen && inode->i_generation != gen) { |
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iput(inode); |
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return ERR_PTR(-ESTALE); |
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} |
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return d_obtain_alias(inode); |
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} |
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static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh, |
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int fh_len, int fh_type) |
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{ |
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struct nilfs_fid *fid = (struct nilfs_fid *)fh; |
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if (fh_len < NILFS_FID_SIZE_NON_CONNECTABLE || |
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(fh_type != FILEID_NILFS_WITH_PARENT && |
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fh_type != FILEID_NILFS_WITHOUT_PARENT)) |
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return NULL; |
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return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen); |
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} |
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static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh, |
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int fh_len, int fh_type) |
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{ |
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struct nilfs_fid *fid = (struct nilfs_fid *)fh; |
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if (fh_len < NILFS_FID_SIZE_CONNECTABLE || |
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fh_type != FILEID_NILFS_WITH_PARENT) |
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return NULL; |
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return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen); |
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} |
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static int nilfs_encode_fh(struct inode *inode, __u32 *fh, int *lenp, |
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struct inode *parent) |
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{ |
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struct nilfs_fid *fid = (struct nilfs_fid *)fh; |
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struct nilfs_root *root = NILFS_I(inode)->i_root; |
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int type; |
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if (parent && *lenp < NILFS_FID_SIZE_CONNECTABLE) { |
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*lenp = NILFS_FID_SIZE_CONNECTABLE; |
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return FILEID_INVALID; |
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} |
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if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE) { |
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*lenp = NILFS_FID_SIZE_NON_CONNECTABLE; |
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return FILEID_INVALID; |
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} |
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fid->cno = root->cno; |
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fid->ino = inode->i_ino; |
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fid->gen = inode->i_generation; |
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if (parent) { |
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fid->parent_ino = parent->i_ino; |
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fid->parent_gen = parent->i_generation; |
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type = FILEID_NILFS_WITH_PARENT; |
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*lenp = NILFS_FID_SIZE_CONNECTABLE; |
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} else { |
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type = FILEID_NILFS_WITHOUT_PARENT; |
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*lenp = NILFS_FID_SIZE_NON_CONNECTABLE; |
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} |
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return type; |
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} |
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|
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const struct inode_operations nilfs_dir_inode_operations = { |
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.create = nilfs_create, |
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.lookup = nilfs_lookup, |
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.link = nilfs_link, |
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.unlink = nilfs_unlink, |
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.symlink = nilfs_symlink, |
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.mkdir = nilfs_mkdir, |
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.rmdir = nilfs_rmdir, |
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.mknod = nilfs_mknod, |
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.rename = nilfs_rename, |
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.setattr = nilfs_setattr, |
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.permission = nilfs_permission, |
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.fiemap = nilfs_fiemap, |
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.fileattr_get = nilfs_fileattr_get, |
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.fileattr_set = nilfs_fileattr_set, |
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}; |
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const struct inode_operations nilfs_special_inode_operations = { |
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.setattr = nilfs_setattr, |
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.permission = nilfs_permission, |
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}; |
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const struct inode_operations nilfs_symlink_inode_operations = { |
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.get_link = page_get_link, |
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.permission = nilfs_permission, |
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}; |
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|
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const struct export_operations nilfs_export_ops = { |
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.encode_fh = nilfs_encode_fh, |
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.fh_to_dentry = nilfs_fh_to_dentry, |
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.fh_to_parent = nilfs_fh_to_parent, |
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.get_parent = nilfs_get_parent, |
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};
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