[linux.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 <[email protected]> based on ext2 code base.
 *
 * Copyright (C) 1998
 * Daniel Pirkl <[email protected]>
 * Charles University, Faculty of Mathematics and Physics
 *
 *  from
 *
 *  linux/fs/ext2/namei.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card ([email protected])
 * 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 ([email protected]), 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 mnt_idmap * idmap,
		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 mnt_idmap *idmap, 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 mnt_idmap * idmap, 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_set_ctime_current(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 mnt_idmap * idmap, 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_set_ctime_to_ts(inode, inode_get_ctime(dir));
	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 mnt_idmap *idmap, 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);
		inode_set_ctime_current(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.
	 */
	inode_set_ctime_current(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 <[email protected]> based on ext2 code base.
	7	*
1da177e4 LT	8	* Copyright (C) 1998
	9	* Daniel Pirkl <[email protected]>
	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 ([email protected])
	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 ([email protected]), 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	*/
6c960e68	72	static int ufs_create (struct mnt_idmap * idmap,
549c7297	73	struct inode * dir, struct dentry * dentry, umode_t mode,
ebfc3b49	74	bool excl)
1da177e4	75	{
abf5d15f	76	struct inode *inode;
907f4554	77
abf5d15f	78	inode = ufs_new_inode(dir, mode);
a50e4a02 AV	79	if (IS_ERR(inode))
a50e4a02 AV	80	return PTR_ERR(inode);
abf5d15f	81
a50e4a02 AV	82	inode->i_op = &ufs_file_inode_operations;
	83	inode->i_fop = &ufs_file_operations;
	84	inode->i_mapping->a_ops = &ufs_aops;
	85	mark_inode_dirty(inode);
	86	return ufs_add_nondir(dentry, inode);
1da177e4 LT	87	}
1da177e4 LT	88
5ebb29be	89	static int ufs_mknod(struct mnt_idmap idmap, struct inode dir,
549c7297	90	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
7a77db95	109	static int ufs_symlink (struct mnt_idmap * idmap, struct inode * dir,
549c7297	110	struct dentry * dentry, const char * symname)
1da177e4 LT	111	{
1da177e4 LT	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);
dd549927	146	discard_new_inode(inode);
a50e4a02	147	return err;
1da177e4 LT	148	}
	149
	150	static int ufs_link (struct dentry * old_dentry, struct inode * dir,
	151	struct dentry *dentry)
	152	{
2b0143b5	153	struct inode *inode = d_inode(old_dentry);
1da177e4 LT	154	int error;
1da177e4 LT	155
6eeb017e	156	inode_set_ctime_current(inode);
3257545e	157	inode_inc_link_count(inode);
7de9c6ee	158	ihold(inode);
1da177e4	159
12ecbb4b JK	160	error = ufs_add_link(dentry, inode);
	161	if (error) {
	162	inode_dec_link_count(inode);
	163	iput(inode);
	164	} else
	165	d_instantiate(dentry, inode);
1da177e4 LT	166	return error;
	167	}
	168
c54bd91e	169	static int ufs_mkdir(struct mnt_idmap * idmap, struct inode * dir,
549c7297	170	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
1e2e547a	196	d_instantiate_new(dentry, inode);
a50e4a02	197	return 0;
1da177e4 LT	198
1da177e4 LT	199	out_fail:
3257545e AD	200	inode_dec_link_count(inode);
3257545e AD	201	inode_dec_link_count(inode);
dd549927	202	discard_new_inode(inode);
13b987ea	203	out_dir:
3257545e	204	inode_dec_link_count(dir);
a50e4a02	205	return err;
1da177e4 LT	206	}
1da177e4 LT	207
b71034e5	208	static int ufs_unlink(struct inode dir, struct dentry dentry)
1da177e4	209	{
2b0143b5	210	struct inode * inode = d_inode(dentry);
b71034e5 ED	211	struct ufs_dir_entry *de;
b71034e5 ED	212	struct page *page;
1da177e4 LT	213	int err = -ENOENT;
1da177e4 LT	214
08049707	215	de = ufs_find_entry(dir, &dentry->d_name, &page);
1da177e4 LT	216	if (!de)
	217	goto out;
	218
b71034e5	219	err = ufs_delete_entry(dir, de, page);
1da177e4 LT	220	if (err)
	221	goto out;
	222
6eeb017e	223	inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
3257545e	224	inode_dec_link_count(inode);
1da177e4 LT	225	err = 0;
1da177e4 LT	226	out:
1da177e4 LT	227	return err;
	228	}
	229
	230	static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
	231	{
2b0143b5	232	struct inode * inode = d_inode(dentry);
1da177e4 LT	233	int err= -ENOTEMPTY;
1da177e4 LT	234
1da177e4 LT	235	if (ufs_empty_dir (inode)) {
	236	err = ufs_unlink(dir, dentry);
	237	if (!err) {
	238	inode->i_size = 0;
3257545e AD	239	inode_dec_link_count(inode);
3257545e AD	240	inode_dec_link_count(dir);
1da177e4 LT	241	}
1da177e4 LT	242	}
1da177e4 LT	243	return err;
	244	}
	245
e18275ae	246	static int ufs_rename(struct mnt_idmap idmap, struct inode old_dir,
549c7297 CB	247	struct dentry old_dentry, struct inode new_dir,
549c7297 CB	248	struct dentry *new_dentry, unsigned int flags)
1da177e4	249	{
2b0143b5 DH	250	struct inode *old_inode = d_inode(old_dentry);
2b0143b5 DH	251	struct inode *new_inode = d_inode(new_dentry);
b71034e5 ED	252	struct page *dir_page = NULL;
	253	struct ufs_dir_entry * dir_de = NULL;
	254	struct page *old_page;
1da177e4 LT	255	struct ufs_dir_entry *old_de;
	256	int err = -ENOENT;
	257
f03b8ad8 MS	258	if (flags & ~RENAME_NOREPLACE)
	259	return -EINVAL;
	260
08049707	261	old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1da177e4 LT	262	if (!old_de)
	263	goto out;
	264
	265	if (S_ISDIR(old_inode->i_mode)) {
	266	err = -EIO;
b71034e5	267	dir_de = ufs_dotdot(old_inode, &dir_page);
1da177e4 LT	268	if (!dir_de)
	269	goto out_old;
	270	}
	271
	272	if (new_inode) {
b71034e5	273	struct page *new_page;
1da177e4 LT	274	struct ufs_dir_entry *new_de;
	275
	276	err = -ENOTEMPTY;
b71034e5	277	if (dir_de && !ufs_empty_dir(new_inode))
1da177e4	278	goto out_dir;
b71034e5	279
1da177e4	280	err = -ENOENT;
08049707	281	new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1da177e4 LT	282	if (!new_de)
1da177e4 LT	283	goto out_dir;
70d45cdb	284	ufs_set_link(new_dir, new_de, new_page, old_inode, 1);
6eeb017e	285	inode_set_ctime_current(new_inode);
1da177e4	286	if (dir_de)
9a53c3a7	287	drop_nlink(new_inode);
3257545e	288	inode_dec_link_count(new_inode);
1da177e4	289	} else {
1da177e4	290	err = ufs_add_link(new_dentry, old_inode);
37750cdd	291	if (err)
1da177e4	292	goto out_dir;
1da177e4	293	if (dir_de)
3257545e	294	inode_inc_link_count(new_dir);
1da177e4 LT	295	}
1da177e4 LT	296
b71034e5 ED	297	/*
	298	* Like most other Unix systems, set the ctime for inodes on a
	299	* rename.
b71034e5	300	*/
6eeb017e	301	inode_set_ctime_current(old_inode);
1da177e4	302
b71034e5	303	ufs_delete_entry(old_dir, old_de, old_page);
37750cdd	304	mark_inode_dirty(old_inode);
1da177e4 LT	305
1da177e4 LT	306	if (dir_de) {
70d45cdb AV	307	if (old_dir != new_dir)
	308	ufs_set_link(old_inode, dir_de, dir_page, new_dir, 0);
	309	else {
	310	kunmap(dir_page);
09cbfeaf	311	put_page(dir_page);
70d45cdb	312	}
3257545e	313	inode_dec_link_count(old_dir);
1da177e4	314	}
1da177e4 LT	315	return 0;
1da177e4 LT	316
b71034e5	317
1da177e4	318	out_dir:
b71034e5 ED	319	if (dir_de) {
b71034e5 ED	320	kunmap(dir_page);
09cbfeaf	321	put_page(dir_page);
b71034e5	322	}
1da177e4	323	out_old:
b71034e5	324	kunmap(old_page);
09cbfeaf	325	put_page(old_page);
1da177e4	326	out:
1da177e4 LT	327	return err;
	328	}
	329
c5ef1c42	330	const struct inode_operations ufs_dir_inode_operations = {
1da177e4 LT	331	.create = ufs_create,
	332	.lookup = ufs_lookup,
	333	.link = ufs_link,
	334	.unlink = ufs_unlink,
	335	.symlink = ufs_symlink,
	336	.mkdir = ufs_mkdir,
	337	.rmdir = ufs_rmdir,
	338	.mknod = ufs_mknod,
	339	.rename = ufs_rename,
	340	};