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- /*
- * linux/fs/ufs/namei.c
- *
- * Migration to usage of "page cache" on May 2006 by
- * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base.
- *
- * Copyright (C) 1998
- * Daniel Pirkl <daniel.pirkl@email.cz>
- * Charles University, Faculty of Mathematics and Physics
- *
- * from
- *
- * linux/fs/ext2/namei.c
- *
- * Copyright (C) 1992, 1993, 1994, 1995
- * Remy Card (card@masi.ibp.fr)
- * Laboratoire MASI - Institut Blaise Pascal
- * Universite Pierre et Marie Curie (Paris VI)
- *
- * from
- *
- * linux/fs/minix/namei.c
- *
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- * Big-endian to little-endian byte-swapping/bitmaps by
- * David S. Miller (davem@caip.rutgers.edu), 1995
- */
- #include <linux/time.h>
- #include <linux/fs.h>
- #include "ufs_fs.h"
- #include "ufs.h"
- #include "util.h"
- static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode)
- {
- int err = ufs_add_link(dentry, inode);
- if (!err) {
- d_instantiate_new(dentry, inode);
- return 0;
- }
- inode_dec_link_count(inode);
- unlock_new_inode(inode);
- iput(inode);
- return err;
- }
- static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
- {
- struct inode * inode = NULL;
- ino_t ino;
-
- if (dentry->d_name.len > UFS_MAXNAMLEN)
- return ERR_PTR(-ENAMETOOLONG);
- ino = ufs_inode_by_name(dir, &dentry->d_name);
- if (ino)
- inode = ufs_iget(dir->i_sb, ino);
- return d_splice_alias(inode, dentry);
- }
- /*
- * By the time this is called, we already have created
- * the directory cache entry for the new file, but it
- * is so far negative - it has no inode.
- *
- * If the create succeeds, we fill in the inode information
- * with d_instantiate().
- */
- static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode,
- bool excl)
- {
- struct inode *inode;
- inode = ufs_new_inode(dir, mode);
- if (IS_ERR(inode))
- return PTR_ERR(inode);
- inode->i_op = &ufs_file_inode_operations;
- inode->i_fop = &ufs_file_operations;
- inode->i_mapping->a_ops = &ufs_aops;
- mark_inode_dirty(inode);
- return ufs_add_nondir(dentry, inode);
- }
- static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
- {
- struct inode *inode;
- int err;
- if (!old_valid_dev(rdev))
- return -EINVAL;
- inode = ufs_new_inode(dir, mode);
- err = PTR_ERR(inode);
- if (!IS_ERR(inode)) {
- init_special_inode(inode, mode, rdev);
- ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
- mark_inode_dirty(inode);
- err = ufs_add_nondir(dentry, inode);
- }
- return err;
- }
- static int ufs_symlink (struct inode * dir, struct dentry * dentry,
- const char * symname)
- {
- struct super_block * sb = dir->i_sb;
- int err;
- unsigned l = strlen(symname)+1;
- struct inode * inode;
- if (l > sb->s_blocksize)
- return -ENAMETOOLONG;
- inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
- err = PTR_ERR(inode);
- if (IS_ERR(inode))
- return err;
- if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
- /* slow symlink */
- inode->i_op = &ufs_symlink_inode_operations;
- inode->i_mapping->a_ops = &ufs_aops;
- err = page_symlink(inode, symname, l);
- if (err)
- goto out_fail;
- } else {
- /* fast symlink */
- inode->i_op = &ufs_fast_symlink_inode_operations;
- inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
- memcpy(inode->i_link, symname, l);
- inode->i_size = l-1;
- }
- mark_inode_dirty(inode);
- return ufs_add_nondir(dentry, inode);
- out_fail:
- inode_dec_link_count(inode);
- unlock_new_inode(inode);
- iput(inode);
- return err;
- }
- static int ufs_link (struct dentry * old_dentry, struct inode * dir,
- struct dentry *dentry)
- {
- struct inode *inode = d_inode(old_dentry);
- int error;
- inode->i_ctime = CURRENT_TIME_SEC;
- inode_inc_link_count(inode);
- ihold(inode);
- error = ufs_add_link(dentry, inode);
- if (error) {
- inode_dec_link_count(inode);
- iput(inode);
- } else
- d_instantiate(dentry, inode);
- return error;
- }
- static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
- {
- struct inode * inode;
- int err;
- inode_inc_link_count(dir);
- inode = ufs_new_inode(dir, S_IFDIR|mode);
- err = PTR_ERR(inode);
- if (IS_ERR(inode))
- goto out_dir;
- inode->i_op = &ufs_dir_inode_operations;
- inode->i_fop = &ufs_dir_operations;
- inode->i_mapping->a_ops = &ufs_aops;
- inode_inc_link_count(inode);
- err = ufs_make_empty(inode, dir);
- if (err)
- goto out_fail;
- err = ufs_add_link(dentry, inode);
- if (err)
- goto out_fail;
- d_instantiate_new(dentry, inode);
- return 0;
- out_fail:
- inode_dec_link_count(inode);
- inode_dec_link_count(inode);
- unlock_new_inode(inode);
- iput (inode);
- out_dir:
- inode_dec_link_count(dir);
- return err;
- }
- static int ufs_unlink(struct inode *dir, struct dentry *dentry)
- {
- struct inode * inode = d_inode(dentry);
- struct ufs_dir_entry *de;
- struct page *page;
- int err = -ENOENT;
- de = ufs_find_entry(dir, &dentry->d_name, &page);
- if (!de)
- goto out;
- err = ufs_delete_entry(dir, de, page);
- if (err)
- goto out;
- inode->i_ctime = dir->i_ctime;
- inode_dec_link_count(inode);
- err = 0;
- out:
- return err;
- }
- static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
- {
- struct inode * inode = d_inode(dentry);
- int err= -ENOTEMPTY;
- if (ufs_empty_dir (inode)) {
- err = ufs_unlink(dir, dentry);
- if (!err) {
- inode->i_size = 0;
- inode_dec_link_count(inode);
- inode_dec_link_count(dir);
- }
- }
- return err;
- }
- static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry)
- {
- struct inode *old_inode = d_inode(old_dentry);
- struct inode *new_inode = d_inode(new_dentry);
- struct page *dir_page = NULL;
- struct ufs_dir_entry * dir_de = NULL;
- struct page *old_page;
- struct ufs_dir_entry *old_de;
- int err = -ENOENT;
- old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
- if (!old_de)
- goto out;
- if (S_ISDIR(old_inode->i_mode)) {
- err = -EIO;
- dir_de = ufs_dotdot(old_inode, &dir_page);
- if (!dir_de)
- goto out_old;
- }
- if (new_inode) {
- struct page *new_page;
- struct ufs_dir_entry *new_de;
- err = -ENOTEMPTY;
- if (dir_de && !ufs_empty_dir(new_inode))
- goto out_dir;
- err = -ENOENT;
- new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
- if (!new_de)
- goto out_dir;
- ufs_set_link(new_dir, new_de, new_page, old_inode, 1);
- new_inode->i_ctime = CURRENT_TIME_SEC;
- if (dir_de)
- drop_nlink(new_inode);
- inode_dec_link_count(new_inode);
- } else {
- err = ufs_add_link(new_dentry, old_inode);
- if (err)
- goto out_dir;
- if (dir_de)
- inode_inc_link_count(new_dir);
- }
- /*
- * Like most other Unix systems, set the ctime for inodes on a
- * rename.
- */
- old_inode->i_ctime = CURRENT_TIME_SEC;
- ufs_delete_entry(old_dir, old_de, old_page);
- mark_inode_dirty(old_inode);
- if (dir_de) {
- if (old_dir != new_dir)
- ufs_set_link(old_inode, dir_de, dir_page, new_dir, 0);
- else {
- kunmap(dir_page);
- page_cache_release(dir_page);
- }
- inode_dec_link_count(old_dir);
- }
- return 0;
- out_dir:
- if (dir_de) {
- kunmap(dir_page);
- page_cache_release(dir_page);
- }
- out_old:
- kunmap(old_page);
- page_cache_release(old_page);
- out:
- return err;
- }
- const struct inode_operations ufs_dir_inode_operations = {
- .create = ufs_create,
- .lookup = ufs_lookup,
- .link = ufs_link,
- .unlink = ufs_unlink,
- .symlink = ufs_symlink,
- .mkdir = ufs_mkdir,
- .rmdir = ufs_rmdir,
- .mknod = ufs_mknod,
- .rename = ufs_rename,
- };
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