[linux-2.6-block.git] / fs / ufs / namei.c

// SPDX-License-Identifier: GPL-2.0
/*
 * 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) {
		unlock_new_inode(inode);
		d_instantiate(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 = &page_symlink_inode_operations;
		inode_nohighmem(inode);
		inode->i_mapping->a_ops = &ufs_aops;
		err = page_symlink(inode, symname, l);
		if (err)
			goto out_fail;
	} else {
		/* fast symlink */
		inode->i_op = &simple_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(inode);
	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;

	unlock_new_inode(inode);
	d_instantiate(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,
		      unsigned int flags)
{
	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;

	if (flags & ~RENAME_NOREPLACE)
		return -EINVAL;

	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(new_inode);
		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(old_inode);

	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);
			put_page(dir_page);
		}
		inode_dec_link_count(old_dir);
	}
	return 0;


out_dir:
	if (dir_de) {
		kunmap(dir_page);
		put_page(dir_page);
	}
out_old:
	kunmap(old_page);
	put_page(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,
};
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* linux/fs/ufs/namei.c
	4	*
b71034e5 ED	5	* Migration to usage of "page cache" on May 2006 by
	6	* Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base.
	7	*
1da177e4 LT	8	* Copyright (C) 1998
	9	* Daniel Pirkl <daniel.pirkl@email.cz>
	10	* Charles University, Faculty of Mathematics and Physics
	11	*
	12	* from
	13	*
	14	* linux/fs/ext2/namei.c
	15	*
	16	* Copyright (C) 1992, 1993, 1994, 1995
	17	* Remy Card (card@masi.ibp.fr)
	18	* Laboratoire MASI - Institut Blaise Pascal
	19	* Universite Pierre et Marie Curie (Paris VI)
	20	*
	21	* from
	22	*
	23	* linux/fs/minix/namei.c
	24	*
	25	* Copyright (C) 1991, 1992 Linus Torvalds
	26	*
	27	* Big-endian to little-endian byte-swapping/bitmaps by
	28	* David S. Miller (davem@caip.rutgers.edu), 1995
	29	*/
	30
	31	#include <linux/time.h>
	32	#include <linux/fs.h>
e5420598 MF	33
e5420598 MF	34	#include "ufs_fs.h"
bcd6d4ec	35	#include "ufs.h"
1da177e4 LT	36	#include "util.h"
1da177e4 LT	37
1da177e4 LT	38	static inline int ufs_add_nondir(struct dentry dentry, struct inode inode)
	39	{
	40	int err = ufs_add_link(dentry, inode);
	41	if (!err) {
e4502c63	42	unlock_new_inode(inode);
1da177e4 LT	43	d_instantiate(dentry, inode);
	44	return 0;
	45	}
3257545e	46	inode_dec_link_count(inode);
e4502c63	47	unlock_new_inode(inode);
1da177e4 LT	48	iput(inode);
	49	return err;
	50	}
	51
00cd8dd3	52	static struct dentry ufs_lookup(struct inode dir, struct dentry *dentry, unsigned int flags)
1da177e4 LT	53	{
	54	struct inode * inode = NULL;
	55	ino_t ino;
	56
	57	if (dentry->d_name.len > UFS_MAXNAMLEN)
	58	return ERR_PTR(-ENAMETOOLONG);
	59
08049707	60	ino = ufs_inode_by_name(dir, &dentry->d_name);
642c937b	61	if (ino)
b55c460d	62	inode = ufs_iget(dir->i_sb, ino);
642c937b	63	return d_splice_alias(inode, dentry);
1da177e4 LT	64	}
	65
	66	/*
	67	* By the time this is called, we already have created
	68	* the directory cache entry for the new file, but it
	69	* is so far negative - it has no inode.
	70	*
	71	* If the create succeeds, we fill in the inode information
	72	* with d_instantiate().
	73	*/
4acdaf27	74	static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode,
ebfc3b49	75	bool excl)
1da177e4	76	{
abf5d15f	77	struct inode *inode;
907f4554	78
abf5d15f	79	inode = ufs_new_inode(dir, mode);
a50e4a02 AV	80	if (IS_ERR(inode))
a50e4a02 AV	81	return PTR_ERR(inode);
abf5d15f	82
a50e4a02 AV	83	inode->i_op = &ufs_file_inode_operations;
	84	inode->i_fop = &ufs_file_operations;
	85	inode->i_mapping->a_ops = &ufs_aops;
	86	mark_inode_dirty(inode);
	87	return ufs_add_nondir(dentry, inode);
1da177e4 LT	88	}
1da177e4 LT	89
1a67aafb	90	static int ufs_mknod(struct inode dir, struct dentry dentry, umode_t mode, dev_t rdev)
1da177e4 LT	91	{
	92	struct inode *inode;
	93	int err;
	94
	95	if (!old_valid_dev(rdev))
	96	return -EINVAL;
907f4554	97
1da177e4 LT	98	inode = ufs_new_inode(dir, mode);
	99	err = PTR_ERR(inode);
	100	if (!IS_ERR(inode)) {
	101	init_special_inode(inode, mode, rdev);
1da177e4 LT	102	ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
1da177e4 LT	103	mark_inode_dirty(inode);
1da177e4	104	err = ufs_add_nondir(dentry, inode);
1da177e4 LT	105	}
	106	return err;
	107	}
	108
	109	static int ufs_symlink (struct inode * dir, struct dentry * dentry,
	110	const char * symname)
	111	{
	112	struct super_block * sb = dir->i_sb;
a50e4a02	113	int err;
1da177e4 LT	114	unsigned l = strlen(symname)+1;
	115	struct inode * inode;
	116
	117	if (l > sb->s_blocksize)
a50e4a02	118	return -ENAMETOOLONG;
1da177e4	119
1da177e4 LT	120	inode = ufs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	121	err = PTR_ERR(inode);
	122	if (IS_ERR(inode))
a50e4a02	123	return err;
1da177e4 LT	124
	125	if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
	126	/* slow symlink */
9cdce3c0	127	inode->i_op = &page_symlink_inode_operations;
21fc61c7	128	inode_nohighmem(inode);
1da177e4 LT	129	inode->i_mapping->a_ops = &ufs_aops;
	130	err = page_symlink(inode, symname, l);
	131	if (err)
	132	goto out_fail;
	133	} else {
	134	/* fast symlink */
9cdce3c0	135	inode->i_op = &simple_symlink_inode_operations;
4b8061a6 AV	136	inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
4b8061a6 AV	137	memcpy(inode->i_link, symname, l);
1da177e4 LT	138	inode->i_size = l-1;
	139	}
	140	mark_inode_dirty(inode);
	141
a50e4a02	142	return ufs_add_nondir(dentry, inode);
1da177e4 LT	143
1da177e4 LT	144	out_fail:
3257545e	145	inode_dec_link_count(inode);
e4502c63	146	unlock_new_inode(inode);
1da177e4	147	iput(inode);
a50e4a02	148	return err;
1da177e4 LT	149	}
	150
	151	static int ufs_link (struct dentry * old_dentry, struct inode * dir,
	152	struct dentry *dentry)
	153	{
2b0143b5	154	struct inode *inode = d_inode(old_dentry);
1da177e4 LT	155	int error;
1da177e4 LT	156
02027d42	157	inode->i_ctime = current_time(inode);
3257545e	158	inode_inc_link_count(inode);
7de9c6ee	159	ihold(inode);
1da177e4	160
12ecbb4b JK	161	error = ufs_add_link(dentry, inode);
	162	if (error) {
	163	inode_dec_link_count(inode);
	164	iput(inode);
	165	} else
	166	d_instantiate(dentry, inode);
1da177e4 LT	167	return error;
	168	}
	169
18bb1db3	170	static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
1da177e4 LT	171	{
1da177e4 LT	172	struct inode * inode;
8de52778	173	int err;
1da177e4	174
13b987ea FF	175	inode_inc_link_count(dir);
13b987ea FF	176
1da177e4	177	inode = ufs_new_inode(dir, S_IFDIR\|mode);
13b987ea	178	err = PTR_ERR(inode);
1da177e4	179	if (IS_ERR(inode))
13b987ea	180	goto out_dir;
1da177e4 LT	181
	182	inode->i_op = &ufs_dir_inode_operations;
	183	inode->i_fop = &ufs_dir_operations;
826843a3	184	inode->i_mapping->a_ops = &ufs_aops;
1da177e4	185
3257545e	186	inode_inc_link_count(inode);
1da177e4 LT	187
	188	err = ufs_make_empty(inode, dir);
	189	if (err)
	190	goto out_fail;
	191
	192	err = ufs_add_link(dentry, inode);
	193	if (err)
	194	goto out_fail;
1da177e4	195
514d748f	196	unlock_new_inode(inode);
1da177e4	197	d_instantiate(dentry, inode);
a50e4a02	198	return 0;
1da177e4 LT	199
1da177e4 LT	200	out_fail:
3257545e AD	201	inode_dec_link_count(inode);
3257545e AD	202	inode_dec_link_count(inode);
e4502c63	203	unlock_new_inode(inode);
1da177e4	204	iput (inode);
13b987ea	205	out_dir:
3257545e	206	inode_dec_link_count(dir);
a50e4a02	207	return err;
1da177e4 LT	208	}
1da177e4 LT	209
b71034e5	210	static int ufs_unlink(struct inode dir, struct dentry dentry)
1da177e4	211	{
2b0143b5	212	struct inode * inode = d_inode(dentry);
b71034e5 ED	213	struct ufs_dir_entry *de;
b71034e5 ED	214	struct page *page;
1da177e4 LT	215	int err = -ENOENT;
1da177e4 LT	216
08049707	217	de = ufs_find_entry(dir, &dentry->d_name, &page);
1da177e4 LT	218	if (!de)
	219	goto out;
	220
b71034e5	221	err = ufs_delete_entry(dir, de, page);
1da177e4 LT	222	if (err)
	223	goto out;
	224
	225	inode->i_ctime = dir->i_ctime;
3257545e	226	inode_dec_link_count(inode);
1da177e4 LT	227	err = 0;
1da177e4 LT	228	out:
1da177e4 LT	229	return err;
	230	}
	231
	232	static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
	233	{
2b0143b5	234	struct inode * inode = d_inode(dentry);
1da177e4 LT	235	int err= -ENOTEMPTY;
1da177e4 LT	236
1da177e4 LT	237	if (ufs_empty_dir (inode)) {
	238	err = ufs_unlink(dir, dentry);
	239	if (!err) {
	240	inode->i_size = 0;
3257545e AD	241	inode_dec_link_count(inode);
3257545e AD	242	inode_dec_link_count(dir);
1da177e4 LT	243	}
1da177e4 LT	244	}
1da177e4 LT	245	return err;
	246	}
	247
b71034e5	248	static int ufs_rename(struct inode old_dir, struct dentry old_dentry,
f03b8ad8 MS	249	struct inode new_dir, struct dentry new_dentry,
f03b8ad8 MS	250	unsigned int flags)
1da177e4	251	{
2b0143b5 DH	252	struct inode *old_inode = d_inode(old_dentry);
2b0143b5 DH	253	struct inode *new_inode = d_inode(new_dentry);
b71034e5 ED	254	struct page *dir_page = NULL;
	255	struct ufs_dir_entry * dir_de = NULL;
	256	struct page *old_page;
1da177e4 LT	257	struct ufs_dir_entry *old_de;
	258	int err = -ENOENT;
	259
f03b8ad8 MS	260	if (flags & ~RENAME_NOREPLACE)
	261	return -EINVAL;
	262
08049707	263	old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1da177e4 LT	264	if (!old_de)
	265	goto out;
	266
	267	if (S_ISDIR(old_inode->i_mode)) {
	268	err = -EIO;
b71034e5	269	dir_de = ufs_dotdot(old_inode, &dir_page);
1da177e4 LT	270	if (!dir_de)
	271	goto out_old;
	272	}
	273
	274	if (new_inode) {
b71034e5	275	struct page *new_page;
1da177e4 LT	276	struct ufs_dir_entry *new_de;
	277
	278	err = -ENOTEMPTY;
b71034e5	279	if (dir_de && !ufs_empty_dir(new_inode))
1da177e4	280	goto out_dir;
b71034e5	281
1da177e4	282	err = -ENOENT;
08049707	283	new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1da177e4 LT	284	if (!new_de)
1da177e4 LT	285	goto out_dir;
70d45cdb	286	ufs_set_link(new_dir, new_de, new_page, old_inode, 1);
02027d42	287	new_inode->i_ctime = current_time(new_inode);
1da177e4	288	if (dir_de)
9a53c3a7	289	drop_nlink(new_inode);
3257545e	290	inode_dec_link_count(new_inode);
1da177e4	291	} else {
1da177e4	292	err = ufs_add_link(new_dentry, old_inode);
37750cdd	293	if (err)
1da177e4	294	goto out_dir;
1da177e4	295	if (dir_de)
3257545e	296	inode_inc_link_count(new_dir);
1da177e4 LT	297	}
1da177e4 LT	298
b71034e5 ED	299	/*
	300	* Like most other Unix systems, set the ctime for inodes on a
	301	* rename.
b71034e5	302	*/
02027d42	303	old_inode->i_ctime = current_time(old_inode);
1da177e4	304
b71034e5	305	ufs_delete_entry(old_dir, old_de, old_page);
37750cdd	306	mark_inode_dirty(old_inode);
1da177e4 LT	307
1da177e4 LT	308	if (dir_de) {
70d45cdb AV	309	if (old_dir != new_dir)
	310	ufs_set_link(old_inode, dir_de, dir_page, new_dir, 0);
	311	else {
	312	kunmap(dir_page);
09cbfeaf	313	put_page(dir_page);
70d45cdb	314	}
3257545e	315	inode_dec_link_count(old_dir);
1da177e4	316	}
1da177e4 LT	317	return 0;
1da177e4 LT	318
b71034e5	319
1da177e4	320	out_dir:
b71034e5 ED	321	if (dir_de) {
b71034e5 ED	322	kunmap(dir_page);
09cbfeaf	323	put_page(dir_page);
b71034e5	324	}
1da177e4	325	out_old:
b71034e5	326	kunmap(old_page);
09cbfeaf	327	put_page(old_page);
1da177e4	328	out:
1da177e4 LT	329	return err;
	330	}
	331
c5ef1c42	332	const struct inode_operations ufs_dir_inode_operations = {
1da177e4 LT	333	.create = ufs_create,
	334	.lookup = ufs_lookup,
	335	.link = ufs_link,
	336	.unlink = ufs_unlink,
	337	.symlink = ufs_symlink,
	338	.mkdir = ufs_mkdir,
	339	.rmdir = ufs_rmdir,
	340	.mknod = ufs_mknod,
	341	.rename = ufs_rename,
	342	};