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275 lines
5.7 KiB
275 lines
5.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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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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#include "minix.h" |
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static int add_nondir(struct dentry *dentry, struct inode *inode) |
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{ |
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int err = minix_add_link(dentry, inode); |
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if (!err) { |
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d_instantiate(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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iput(inode); |
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return err; |
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} |
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static struct dentry *minix_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 > minix_sb(dir->i_sb)->s_namelen) |
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return ERR_PTR(-ENAMETOOLONG); |
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ino = minix_inode_by_name(dentry); |
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if (ino) |
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inode = minix_iget(dir->i_sb, ino); |
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return d_splice_alias(inode, dentry); |
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} |
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static int minix_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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int error; |
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struct inode *inode; |
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if (!old_valid_dev(rdev)) |
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return -EINVAL; |
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inode = minix_new_inode(dir, mode, &error); |
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if (inode) { |
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minix_set_inode(inode, rdev); |
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mark_inode_dirty(inode); |
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error = add_nondir(dentry, inode); |
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} |
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return error; |
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} |
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static int minix_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, |
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struct file *file, umode_t mode) |
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{ |
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int error; |
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struct inode *inode = minix_new_inode(dir, mode, &error); |
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if (inode) { |
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minix_set_inode(inode, 0); |
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mark_inode_dirty(inode); |
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d_tmpfile(file, inode); |
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} |
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return finish_open_simple(file, error); |
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} |
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static int minix_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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return minix_mknod(mnt_userns, dir, dentry, mode, 0); |
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} |
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static int minix_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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int err = -ENAMETOOLONG; |
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int i = strlen(symname)+1; |
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struct inode * inode; |
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if (i > dir->i_sb->s_blocksize) |
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goto out; |
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inode = minix_new_inode(dir, S_IFLNK | 0777, &err); |
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if (!inode) |
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goto out; |
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minix_set_inode(inode, 0); |
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err = page_symlink(inode, symname, i); |
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if (err) |
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goto out_fail; |
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err = add_nondir(dentry, inode); |
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out: |
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return err; |
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out_fail: |
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inode_dec_link_count(inode); |
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iput(inode); |
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goto out; |
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} |
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static int minix_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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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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return add_nondir(dentry, inode); |
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} |
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static int minix_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 = minix_new_inode(dir, S_IFDIR | mode, &err); |
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if (!inode) |
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goto out_dir; |
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minix_set_inode(inode, 0); |
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inode_inc_link_count(inode); |
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err = minix_make_empty(inode, dir); |
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if (err) |
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goto out_fail; |
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err = minix_add_link(dentry, inode); |
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if (err) |
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goto out_fail; |
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d_instantiate(dentry, inode); |
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out: |
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return err; |
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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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iput(inode); |
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out_dir: |
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inode_dec_link_count(dir); |
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goto out; |
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} |
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static int minix_unlink(struct inode * dir, struct dentry *dentry) |
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{ |
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int err = -ENOENT; |
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struct inode * inode = d_inode(dentry); |
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struct page * page; |
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struct minix_dir_entry * de; |
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de = minix_find_entry(dentry, &page); |
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if (!de) |
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goto end_unlink; |
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err = minix_delete_entry(de, page); |
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if (err) |
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goto end_unlink; |
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inode->i_ctime = dir->i_ctime; |
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inode_dec_link_count(inode); |
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end_unlink: |
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return err; |
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} |
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static int minix_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 (minix_empty_dir(inode)) { |
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err = minix_unlink(dir, dentry); |
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if (!err) { |
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inode_dec_link_count(dir); |
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inode_dec_link_count(inode); |
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} |
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} |
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return err; |
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} |
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static int minix_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 minix_dir_entry * dir_de = NULL; |
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struct page * old_page; |
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struct minix_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 = minix_find_entry(old_dentry, &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 = minix_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 minix_dir_entry * new_de; |
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err = -ENOTEMPTY; |
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if (dir_de && !minix_empty_dir(new_inode)) |
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goto out_dir; |
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err = -ENOENT; |
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new_de = minix_find_entry(new_dentry, &new_page); |
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if (!new_de) |
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goto out_dir; |
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minix_set_link(new_de, new_page, old_inode); |
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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 = minix_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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minix_delete_entry(old_de, old_page); |
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mark_inode_dirty(old_inode); |
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if (dir_de) { |
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minix_set_link(dir_de, dir_page, new_dir); |
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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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/* |
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* directories can handle most operations... |
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*/ |
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const struct inode_operations minix_dir_inode_operations = { |
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.create = minix_create, |
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.lookup = minix_lookup, |
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.link = minix_link, |
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.unlink = minix_unlink, |
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.symlink = minix_symlink, |
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.mkdir = minix_mkdir, |
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.rmdir = minix_rmdir, |
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.mknod = minix_mknod, |
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.rename = minix_rename, |
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.getattr = minix_getattr, |
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.tmpfile = minix_tmpfile, |
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};
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