[linux-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) {
		d_instantiate_new(dentry, inode);
		return 0;
	}
	inode_dec_link_count(inode);
	discard_new_inode(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);
	discard_new_inode(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;

	d_instantiate_new(dentry, inode);
	return 0;

out_fail:
	inode_dec_link_count(inode);
	inode_dec_link_count(inode);
	discard_new_inode(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) {
1e2e547a	42	d_instantiate_new(dentry, inode);
1da177e4 LT	43	return 0;
1da177e4 LT	44	}
3257545e	45	inode_dec_link_count(inode);
dd549927	46	discard_new_inode(inode);
1da177e4 LT	47	return err;
	48	}
	49
00cd8dd3	50	static struct dentry ufs_lookup(struct inode dir, struct dentry *dentry, unsigned int flags)
1da177e4 LT	51	{
	52	struct inode * inode = NULL;
	53	ino_t ino;
	54
	55	if (dentry->d_name.len > UFS_MAXNAMLEN)
	56	return ERR_PTR(-ENAMETOOLONG);
	57
08049707	58	ino = ufs_inode_by_name(dir, &dentry->d_name);
642c937b	59	if (ino)
b55c460d	60	inode = ufs_iget(dir->i_sb, ino);
642c937b	61	return d_splice_alias(inode, dentry);
1da177e4 LT	62	}
	63
	64	/*
	65	* By the time this is called, we already have created
	66	* the directory cache entry for the new file, but it
	67	* is so far negative - it has no inode.
	68	*
	69	* If the create succeeds, we fill in the inode information
	70	* with d_instantiate().
	71	*/
4acdaf27	72	static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode,
ebfc3b49	73	bool excl)
1da177e4	74	{
abf5d15f	75	struct inode *inode;
907f4554	76
abf5d15f	77	inode = ufs_new_inode(dir, mode);
a50e4a02 AV	78	if (IS_ERR(inode))
a50e4a02 AV	79	return PTR_ERR(inode);
abf5d15f	80
a50e4a02 AV	81	inode->i_op = &ufs_file_inode_operations;
	82	inode->i_fop = &ufs_file_operations;
	83	inode->i_mapping->a_ops = &ufs_aops;
	84	mark_inode_dirty(inode);
	85	return ufs_add_nondir(dentry, inode);
1da177e4 LT	86	}
1da177e4 LT	87
1a67aafb	88	static int ufs_mknod(struct inode dir, struct dentry dentry, umode_t mode, dev_t rdev)
1da177e4 LT	89	{
	90	struct inode *inode;
	91	int err;
	92
	93	if (!old_valid_dev(rdev))
	94	return -EINVAL;
907f4554	95
1da177e4 LT	96	inode = ufs_new_inode(dir, mode);
	97	err = PTR_ERR(inode);
	98	if (!IS_ERR(inode)) {
	99	init_special_inode(inode, mode, rdev);
1da177e4 LT	100	ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
1da177e4 LT	101	mark_inode_dirty(inode);
1da177e4	102	err = ufs_add_nondir(dentry, inode);
1da177e4 LT	103	}
	104	return err;
	105	}
	106
	107	static int ufs_symlink (struct inode * dir, struct dentry * dentry,
	108	const char * symname)
	109	{
	110	struct super_block * sb = dir->i_sb;
a50e4a02	111	int err;
1da177e4 LT	112	unsigned l = strlen(symname)+1;
	113	struct inode * inode;
	114
	115	if (l > sb->s_blocksize)
a50e4a02	116	return -ENAMETOOLONG;
1da177e4	117
1da177e4 LT	118	inode = ufs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	119	err = PTR_ERR(inode);
	120	if (IS_ERR(inode))
a50e4a02	121	return err;
1da177e4 LT	122
	123	if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
	124	/* slow symlink */
9cdce3c0	125	inode->i_op = &page_symlink_inode_operations;
21fc61c7	126	inode_nohighmem(inode);
1da177e4 LT	127	inode->i_mapping->a_ops = &ufs_aops;
	128	err = page_symlink(inode, symname, l);
	129	if (err)
	130	goto out_fail;
	131	} else {
	132	/* fast symlink */
9cdce3c0	133	inode->i_op = &simple_symlink_inode_operations;
4b8061a6 AV	134	inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
4b8061a6 AV	135	memcpy(inode->i_link, symname, l);
1da177e4 LT	136	inode->i_size = l-1;
	137	}
	138	mark_inode_dirty(inode);
	139
a50e4a02	140	return ufs_add_nondir(dentry, inode);
1da177e4 LT	141
1da177e4 LT	142	out_fail:
3257545e	143	inode_dec_link_count(inode);
dd549927	144	discard_new_inode(inode);
a50e4a02	145	return err;
1da177e4 LT	146	}
	147
	148	static int ufs_link (struct dentry * old_dentry, struct inode * dir,
	149	struct dentry *dentry)
	150	{
2b0143b5	151	struct inode *inode = d_inode(old_dentry);
1da177e4 LT	152	int error;
1da177e4 LT	153
02027d42	154	inode->i_ctime = current_time(inode);
3257545e	155	inode_inc_link_count(inode);
7de9c6ee	156	ihold(inode);
1da177e4	157
12ecbb4b JK	158	error = ufs_add_link(dentry, inode);
	159	if (error) {
	160	inode_dec_link_count(inode);
	161	iput(inode);
	162	} else
	163	d_instantiate(dentry, inode);
1da177e4 LT	164	return error;
	165	}
	166
18bb1db3	167	static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
1da177e4 LT	168	{
1da177e4 LT	169	struct inode * inode;
8de52778	170	int err;
1da177e4	171
13b987ea FF	172	inode_inc_link_count(dir);
13b987ea FF	173
1da177e4	174	inode = ufs_new_inode(dir, S_IFDIR\|mode);
13b987ea	175	err = PTR_ERR(inode);
1da177e4	176	if (IS_ERR(inode))
13b987ea	177	goto out_dir;
1da177e4 LT	178
	179	inode->i_op = &ufs_dir_inode_operations;
	180	inode->i_fop = &ufs_dir_operations;
826843a3	181	inode->i_mapping->a_ops = &ufs_aops;
1da177e4	182
3257545e	183	inode_inc_link_count(inode);
1da177e4 LT	184
	185	err = ufs_make_empty(inode, dir);
	186	if (err)
	187	goto out_fail;
	188
	189	err = ufs_add_link(dentry, inode);
	190	if (err)
	191	goto out_fail;
1da177e4	192
1e2e547a	193	d_instantiate_new(dentry, inode);
a50e4a02	194	return 0;
1da177e4 LT	195
1da177e4 LT	196	out_fail:
3257545e AD	197	inode_dec_link_count(inode);
3257545e AD	198	inode_dec_link_count(inode);
dd549927	199	discard_new_inode(inode);
13b987ea	200	out_dir:
3257545e	201	inode_dec_link_count(dir);
a50e4a02	202	return err;
1da177e4 LT	203	}
1da177e4 LT	204
b71034e5	205	static int ufs_unlink(struct inode dir, struct dentry dentry)
1da177e4	206	{
2b0143b5	207	struct inode * inode = d_inode(dentry);
b71034e5 ED	208	struct ufs_dir_entry *de;
b71034e5 ED	209	struct page *page;
1da177e4 LT	210	int err = -ENOENT;
1da177e4 LT	211
08049707	212	de = ufs_find_entry(dir, &dentry->d_name, &page);
1da177e4 LT	213	if (!de)
	214	goto out;
	215
b71034e5	216	err = ufs_delete_entry(dir, de, page);
1da177e4 LT	217	if (err)
	218	goto out;
	219
	220	inode->i_ctime = dir->i_ctime;
3257545e	221	inode_dec_link_count(inode);
1da177e4 LT	222	err = 0;
1da177e4 LT	223	out:
1da177e4 LT	224	return err;
	225	}
	226
	227	static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
	228	{
2b0143b5	229	struct inode * inode = d_inode(dentry);
1da177e4 LT	230	int err= -ENOTEMPTY;
1da177e4 LT	231
1da177e4 LT	232	if (ufs_empty_dir (inode)) {
	233	err = ufs_unlink(dir, dentry);
	234	if (!err) {
	235	inode->i_size = 0;
3257545e AD	236	inode_dec_link_count(inode);
3257545e AD	237	inode_dec_link_count(dir);
1da177e4 LT	238	}
1da177e4 LT	239	}
1da177e4 LT	240	return err;
	241	}
	242
b71034e5	243	static int ufs_rename(struct inode old_dir, struct dentry old_dentry,
f03b8ad8 MS	244	struct inode new_dir, struct dentry new_dentry,
f03b8ad8 MS	245	unsigned int flags)
1da177e4	246	{
2b0143b5 DH	247	struct inode *old_inode = d_inode(old_dentry);
2b0143b5 DH	248	struct inode *new_inode = d_inode(new_dentry);
b71034e5 ED	249	struct page *dir_page = NULL;
	250	struct ufs_dir_entry * dir_de = NULL;
	251	struct page *old_page;
1da177e4 LT	252	struct ufs_dir_entry *old_de;
	253	int err = -ENOENT;
	254
f03b8ad8 MS	255	if (flags & ~RENAME_NOREPLACE)
	256	return -EINVAL;
	257
08049707	258	old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1da177e4 LT	259	if (!old_de)
	260	goto out;
	261
	262	if (S_ISDIR(old_inode->i_mode)) {
	263	err = -EIO;
b71034e5	264	dir_de = ufs_dotdot(old_inode, &dir_page);
1da177e4 LT	265	if (!dir_de)
	266	goto out_old;
	267	}
	268
	269	if (new_inode) {
b71034e5	270	struct page *new_page;
1da177e4 LT	271	struct ufs_dir_entry *new_de;
	272
	273	err = -ENOTEMPTY;
b71034e5	274	if (dir_de && !ufs_empty_dir(new_inode))
1da177e4	275	goto out_dir;
b71034e5	276
1da177e4	277	err = -ENOENT;
08049707	278	new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1da177e4 LT	279	if (!new_de)
1da177e4 LT	280	goto out_dir;
70d45cdb	281	ufs_set_link(new_dir, new_de, new_page, old_inode, 1);
02027d42	282	new_inode->i_ctime = current_time(new_inode);
1da177e4	283	if (dir_de)
9a53c3a7	284	drop_nlink(new_inode);
3257545e	285	inode_dec_link_count(new_inode);
1da177e4	286	} else {
1da177e4	287	err = ufs_add_link(new_dentry, old_inode);
37750cdd	288	if (err)
1da177e4	289	goto out_dir;
1da177e4	290	if (dir_de)
3257545e	291	inode_inc_link_count(new_dir);
1da177e4 LT	292	}
1da177e4 LT	293
b71034e5 ED	294	/*
	295	* Like most other Unix systems, set the ctime for inodes on a
	296	* rename.
b71034e5	297	*/
02027d42	298	old_inode->i_ctime = current_time(old_inode);
1da177e4	299
b71034e5	300	ufs_delete_entry(old_dir, old_de, old_page);
37750cdd	301	mark_inode_dirty(old_inode);
1da177e4 LT	302
1da177e4 LT	303	if (dir_de) {
70d45cdb AV	304	if (old_dir != new_dir)
	305	ufs_set_link(old_inode, dir_de, dir_page, new_dir, 0);
	306	else {
	307	kunmap(dir_page);
09cbfeaf	308	put_page(dir_page);
70d45cdb	309	}
3257545e	310	inode_dec_link_count(old_dir);
1da177e4	311	}
1da177e4 LT	312	return 0;
1da177e4 LT	313
b71034e5	314
1da177e4	315	out_dir:
b71034e5 ED	316	if (dir_de) {
b71034e5 ED	317	kunmap(dir_page);
09cbfeaf	318	put_page(dir_page);
b71034e5	319	}
1da177e4	320	out_old:
b71034e5	321	kunmap(old_page);
09cbfeaf	322	put_page(old_page);
1da177e4	323	out:
1da177e4 LT	324	return err;
	325	}
	326
c5ef1c42	327	const struct inode_operations ufs_dir_inode_operations = {
1da177e4 LT	328	.create = ufs_create,
	329	.lookup = ufs_lookup,
	330	.link = ufs_link,
	331	.unlink = ufs_unlink,
	332	.symlink = ufs_symlink,
	333	.mkdir = ufs_mkdir,
	334	.rmdir = ufs_rmdir,
	335	.mknod = ufs_mknod,
	336	.rename = ufs_rename,
	337	};