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340 lines
7.4 KiB
340 lines
7.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/fs/ufs/namei.c |
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* |
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* Migration to usage of "page cache" on May 2006 by |
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* Evgeniy Dushistov <[email protected]> based on ext2 code base. |
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* |
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* Copyright (C) 1998 |
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* Daniel Pirkl <[email protected]> |
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* Charles University, Faculty of Mathematics and Physics |
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* |
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* from |
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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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#include <linux/time.h> |
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#include <linux/fs.h> |
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#include "ufs_fs.h" |
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#include "ufs.h" |
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#include "util.h" |
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static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode) |
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{ |
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int err = ufs_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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discard_new_inode(inode); |
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return err; |
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} |
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static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags) |
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{ |
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struct inode * inode = NULL; |
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ino_t ino; |
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if (dentry->d_name.len > UFS_MAXNAMLEN) |
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return ERR_PTR(-ENAMETOOLONG); |
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ino = ufs_inode_by_name(dir, &dentry->d_name); |
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if (ino) |
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inode = ufs_iget(dir->i_sb, ino); |
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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 ufs_create (struct user_namespace * mnt_userns, |
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struct inode * dir, struct dentry * dentry, umode_t mode, |
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bool excl) |
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{ |
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struct inode *inode; |
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inode = ufs_new_inode(dir, mode); |
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if (IS_ERR(inode)) |
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return PTR_ERR(inode); |
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inode->i_op = &ufs_file_inode_operations; |
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inode->i_fop = &ufs_file_operations; |
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inode->i_mapping->a_ops = &ufs_aops; |
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mark_inode_dirty(inode); |
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return ufs_add_nondir(dentry, inode); |
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} |
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static int ufs_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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int err; |
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if (!old_valid_dev(rdev)) |
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return -EINVAL; |
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inode = ufs_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, mode, rdev); |
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ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev); |
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mark_inode_dirty(inode); |
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err = ufs_add_nondir(dentry, inode); |
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} |
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return err; |
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} |
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static int ufs_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 super_block * sb = dir->i_sb; |
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int err; |
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unsigned l = strlen(symname)+1; |
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struct inode * inode; |
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if (l > sb->s_blocksize) |
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return -ENAMETOOLONG; |
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inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO); |
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err = PTR_ERR(inode); |
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if (IS_ERR(inode)) |
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return err; |
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if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) { |
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/* slow symlink */ |
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inode->i_op = &page_symlink_inode_operations; |
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inode_nohighmem(inode); |
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inode->i_mapping->a_ops = &ufs_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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} else { |
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/* fast symlink */ |
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inode->i_op = &simple_symlink_inode_operations; |
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inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink; |
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memcpy(inode->i_link, symname, l); |
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inode->i_size = l-1; |
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} |
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mark_inode_dirty(inode); |
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return ufs_add_nondir(dentry, inode); |
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out_fail: |
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inode_dec_link_count(inode); |
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discard_new_inode(inode); |
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return err; |
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} |
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static int ufs_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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int error; |
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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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error = ufs_add_link(dentry, inode); |
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if (error) { |
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inode_dec_link_count(inode); |
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iput(inode); |
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} else |
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d_instantiate(dentry, inode); |
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return error; |
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} |
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static int ufs_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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int err; |
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inode_inc_link_count(dir); |
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inode = ufs_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 = &ufs_dir_inode_operations; |
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inode->i_fop = &ufs_dir_operations; |
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inode->i_mapping->a_ops = &ufs_aops; |
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inode_inc_link_count(inode); |
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err = ufs_make_empty(inode, dir); |
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if (err) |
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goto out_fail; |
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err = ufs_add_link(dentry, inode); |
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if (err) |
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goto out_fail; |
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d_instantiate_new(dentry, inode); |
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return 0; |
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out_fail: |
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inode_dec_link_count(inode); |
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inode_dec_link_count(inode); |
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discard_new_inode(inode); |
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out_dir: |
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inode_dec_link_count(dir); |
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return err; |
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} |
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static int ufs_unlink(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 ufs_dir_entry *de; |
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struct page *page; |
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int err = -ENOENT; |
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de = ufs_find_entry(dir, &dentry->d_name, &page); |
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if (!de) |
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goto out; |
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err = ufs_delete_entry(dir, 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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inode_dec_link_count(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 ufs_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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int err= -ENOTEMPTY; |
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if (ufs_empty_dir (inode)) { |
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err = ufs_unlink(dir, dentry); |
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if (!err) { |
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inode->i_size = 0; |
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inode_dec_link_count(inode); |
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inode_dec_link_count(dir); |
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} |
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} |
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return err; |
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} |
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static int ufs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, |
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struct dentry *old_dentry, struct inode *new_dir, |
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struct dentry *new_dentry, 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 ufs_dir_entry * dir_de = NULL; |
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struct page *old_page; |
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struct ufs_dir_entry *old_de; |
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int err = -ENOENT; |
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if (flags & ~RENAME_NOREPLACE) |
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return -EINVAL; |
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old_de = ufs_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 = ufs_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 ufs_dir_entry *new_de; |
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err = -ENOTEMPTY; |
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if (dir_de && !ufs_empty_dir(new_inode)) |
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goto out_dir; |
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err = -ENOENT; |
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new_de = ufs_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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ufs_set_link(new_dir, new_de, new_page, old_inode, 1); |
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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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inode_dec_link_count(new_inode); |
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} else { |
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err = ufs_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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inode_inc_link_count(new_dir); |
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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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ufs_delete_entry(old_dir, old_de, old_page); |
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mark_inode_dirty(old_inode); |
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if (dir_de) { |
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if (old_dir != new_dir) |
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ufs_set_link(old_inode, dir_de, dir_page, new_dir, 0); |
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else { |
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kunmap(dir_page); |
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put_page(dir_page); |
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} |
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inode_dec_link_count(old_dir); |
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} |
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return 0; |
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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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return err; |
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} |
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const struct inode_operations ufs_dir_inode_operations = { |
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.create = ufs_create, |
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.lookup = ufs_lookup, |
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.link = ufs_link, |
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.unlink = ufs_unlink, |
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.symlink = ufs_symlink, |
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.mkdir = ufs_mkdir, |
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.rmdir = ufs_rmdir, |
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.mknod = ufs_mknod, |
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.rename = ufs_rename, |
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};
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