[mirror_ubuntu-hirsute-kernel.git] / fs / ufs / namei.c

/*
 * 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 = &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;
		memcpy(UFS_I(inode)->i_u1.i_symlink, 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;

	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)
{
	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);
		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) {
		ufs_set_link(old_inode, dir_de, dir_page, new_dir);
		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,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/ufs/namei.c
	3	*
b71034e5 ED	4	* Migration to usage of "page cache" on May 2006 by
	5	* Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base.
	6	*
1da177e4 LT	7	* Copyright (C) 1998
	8	* Daniel Pirkl <daniel.pirkl@email.cz>
	9	* Charles University, Faculty of Mathematics and Physics
	10	*
	11	* from
	12	*
	13	* linux/fs/ext2/namei.c
	14	*
	15	* Copyright (C) 1992, 1993, 1994, 1995
	16	* Remy Card (card@masi.ibp.fr)
	17	* Laboratoire MASI - Institut Blaise Pascal
	18	* Universite Pierre et Marie Curie (Paris VI)
	19	*
	20	* from
	21	*
	22	* linux/fs/minix/namei.c
	23	*
	24	* Copyright (C) 1991, 1992 Linus Torvalds
	25	*
	26	* Big-endian to little-endian byte-swapping/bitmaps by
	27	* David S. Miller (davem@caip.rutgers.edu), 1995
	28	*/
	29
	30	#include <linux/time.h>
	31	#include <linux/fs.h>
e5420598 MF	32
e5420598 MF	33	#include "ufs_fs.h"
bcd6d4ec	34	#include "ufs.h"
1da177e4 LT	35	#include "util.h"
1da177e4 LT	36
1da177e4 LT	37	static inline int ufs_add_nondir(struct dentry dentry, struct inode inode)
	38	{
	39	int err = ufs_add_link(dentry, inode);
	40	if (!err) {
e4502c63	41	unlock_new_inode(inode);
1da177e4 LT	42	d_instantiate(dentry, inode);
	43	return 0;
	44	}
3257545e	45	inode_dec_link_count(inode);
e4502c63	46	unlock_new_inode(inode);
1da177e4 LT	47	iput(inode);
	48	return err;
	49	}
	50
00cd8dd3	51	static struct dentry ufs_lookup(struct inode dir, struct dentry *dentry, unsigned int flags)
1da177e4 LT	52	{
	53	struct inode * inode = NULL;
	54	ino_t ino;
	55
	56	if (dentry->d_name.len > UFS_MAXNAMLEN)
	57	return ERR_PTR(-ENAMETOOLONG);
	58
08049707	59	ino = ufs_inode_by_name(dir, &dentry->d_name);
642c937b	60	if (ino)
b55c460d	61	inode = ufs_iget(dir->i_sb, ino);
642c937b	62	return d_splice_alias(inode, dentry);
1da177e4 LT	63	}
	64
	65	/*
	66	* By the time this is called, we already have created
	67	* the directory cache entry for the new file, but it
	68	* is so far negative - it has no inode.
	69	*
	70	* If the create succeeds, we fill in the inode information
	71	* with d_instantiate().
	72	*/
4acdaf27	73	static int ufs_create (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
1a67aafb	89	static int ufs_mknod(struct inode dir, struct dentry dentry, umode_t mode, dev_t rdev)
1da177e4 LT	90	{
	91	struct inode *inode;
	92	int err;
	93
	94	if (!old_valid_dev(rdev))
	95	return -EINVAL;
907f4554	96
1da177e4 LT	97	inode = ufs_new_inode(dir, mode);
	98	err = PTR_ERR(inode);
	99	if (!IS_ERR(inode)) {
	100	init_special_inode(inode, mode, rdev);
1da177e4 LT	101	ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
1da177e4 LT	102	mark_inode_dirty(inode);
1da177e4	103	err = ufs_add_nondir(dentry, inode);
1da177e4 LT	104	}
	105	return err;
	106	}
	107
	108	static int ufs_symlink (struct inode * dir, struct dentry * dentry,
	109	const char * symname)
	110	{
	111	struct super_block * sb = dir->i_sb;
a50e4a02	112	int err;
1da177e4 LT	113	unsigned l = strlen(symname)+1;
	114	struct inode * inode;
	115
	116	if (l > sb->s_blocksize)
a50e4a02	117	return -ENAMETOOLONG;
1da177e4	118
1da177e4 LT	119	inode = ufs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	120	err = PTR_ERR(inode);
	121	if (IS_ERR(inode))
a50e4a02	122	return err;
1da177e4 LT	123
	124	if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
	125	/* slow symlink */
311b9549	126	inode->i_op = &ufs_symlink_inode_operations;
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 */
	133	inode->i_op = &ufs_fast_symlink_inode_operations;
723be1f3	134	memcpy(UFS_I(inode)->i_u1.i_symlink, symname, l);
1da177e4 LT	135	inode->i_size = l-1;
	136	}
	137	mark_inode_dirty(inode);
	138
a50e4a02	139	return ufs_add_nondir(dentry, inode);
1da177e4 LT	140
1da177e4 LT	141	out_fail:
3257545e	142	inode_dec_link_count(inode);
e4502c63	143	unlock_new_inode(inode);
1da177e4	144	iput(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
1da177e4	154	inode->i_ctime = CURRENT_TIME_SEC;
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
514d748f	193	unlock_new_inode(inode);
1da177e4	194	d_instantiate(dentry, inode);
a50e4a02	195	return 0;
1da177e4 LT	196
1da177e4 LT	197	out_fail:
3257545e AD	198	inode_dec_link_count(inode);
3257545e AD	199	inode_dec_link_count(inode);
e4502c63	200	unlock_new_inode(inode);
1da177e4	201	iput (inode);
13b987ea	202	out_dir:
3257545e	203	inode_dec_link_count(dir);
a50e4a02	204	return err;
1da177e4 LT	205	}
1da177e4 LT	206
b71034e5	207	static int ufs_unlink(struct inode dir, struct dentry dentry)
1da177e4	208	{
2b0143b5	209	struct inode * inode = d_inode(dentry);
b71034e5 ED	210	struct ufs_dir_entry *de;
b71034e5 ED	211	struct page *page;
1da177e4 LT	212	int err = -ENOENT;
1da177e4 LT	213
08049707	214	de = ufs_find_entry(dir, &dentry->d_name, &page);
1da177e4 LT	215	if (!de)
	216	goto out;
	217
b71034e5	218	err = ufs_delete_entry(dir, de, page);
1da177e4 LT	219	if (err)
	220	goto out;
	221
	222	inode->i_ctime = dir->i_ctime;
3257545e	223	inode_dec_link_count(inode);
1da177e4 LT	224	err = 0;
1da177e4 LT	225	out:
1da177e4 LT	226	return err;
	227	}
	228
	229	static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
	230	{
2b0143b5	231	struct inode * inode = d_inode(dentry);
1da177e4 LT	232	int err= -ENOTEMPTY;
1da177e4 LT	233
1da177e4 LT	234	if (ufs_empty_dir (inode)) {
	235	err = ufs_unlink(dir, dentry);
	236	if (!err) {
	237	inode->i_size = 0;
3257545e AD	238	inode_dec_link_count(inode);
3257545e AD	239	inode_dec_link_count(dir);
1da177e4 LT	240	}
1da177e4 LT	241	}
1da177e4 LT	242	return err;
	243	}
	244
b71034e5 ED	245	static int ufs_rename(struct inode old_dir, struct dentry old_dentry,
b71034e5 ED	246	struct inode new_dir, struct dentry new_dentry)
1da177e4	247	{
2b0143b5 DH	248	struct inode *old_inode = d_inode(old_dentry);
2b0143b5 DH	249	struct inode *new_inode = d_inode(new_dentry);
b71034e5 ED	250	struct page *dir_page = NULL;
	251	struct ufs_dir_entry * dir_de = NULL;
	252	struct page *old_page;
1da177e4 LT	253	struct ufs_dir_entry *old_de;
	254	int err = -ENOENT;
	255
08049707	256	old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1da177e4 LT	257	if (!old_de)
	258	goto out;
	259
	260	if (S_ISDIR(old_inode->i_mode)) {
	261	err = -EIO;
b71034e5	262	dir_de = ufs_dotdot(old_inode, &dir_page);
1da177e4 LT	263	if (!dir_de)
	264	goto out_old;
	265	}
	266
	267	if (new_inode) {
b71034e5	268	struct page *new_page;
1da177e4 LT	269	struct ufs_dir_entry *new_de;
	270
	271	err = -ENOTEMPTY;
b71034e5	272	if (dir_de && !ufs_empty_dir(new_inode))
1da177e4	273	goto out_dir;
b71034e5	274
1da177e4	275	err = -ENOENT;
08049707	276	new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1da177e4 LT	277	if (!new_de)
1da177e4 LT	278	goto out_dir;
b71034e5	279	ufs_set_link(new_dir, new_de, new_page, old_inode);
1da177e4 LT	280	new_inode->i_ctime = CURRENT_TIME_SEC;
1da177e4 LT	281	if (dir_de)
9a53c3a7	282	drop_nlink(new_inode);
3257545e	283	inode_dec_link_count(new_inode);
1da177e4	284	} else {
1da177e4	285	err = ufs_add_link(new_dentry, old_inode);
37750cdd	286	if (err)
1da177e4	287	goto out_dir;
1da177e4	288	if (dir_de)
3257545e	289	inode_inc_link_count(new_dir);
1da177e4 LT	290	}
1da177e4 LT	291
b71034e5 ED	292	/*
	293	* Like most other Unix systems, set the ctime for inodes on a
	294	* rename.
b71034e5 ED	295	*/
b71034e5 ED	296	old_inode->i_ctime = CURRENT_TIME_SEC;
1da177e4	297
b71034e5	298	ufs_delete_entry(old_dir, old_de, old_page);
37750cdd	299	mark_inode_dirty(old_inode);
1da177e4 LT	300
1da177e4 LT	301	if (dir_de) {
b71034e5	302	ufs_set_link(old_inode, dir_de, dir_page, new_dir);
3257545e	303	inode_dec_link_count(old_dir);
1da177e4	304	}
1da177e4 LT	305	return 0;
1da177e4 LT	306
b71034e5	307
1da177e4	308	out_dir:
b71034e5 ED	309	if (dir_de) {
	310	kunmap(dir_page);
	311	page_cache_release(dir_page);
	312	}
1da177e4	313	out_old:
b71034e5 ED	314	kunmap(old_page);
b71034e5 ED	315	page_cache_release(old_page);
1da177e4	316	out:
1da177e4 LT	317	return err;
	318	}
	319
c5ef1c42	320	const struct inode_operations ufs_dir_inode_operations = {
1da177e4 LT	321	.create = ufs_create,
	322	.lookup = ufs_lookup,
	323	.link = ufs_link,
	324	.unlink = ufs_unlink,
	325	.symlink = ufs_symlink,
	326	.mkdir = ufs_mkdir,
	327	.rmdir = ufs_rmdir,
	328	.mknod = ufs_mknod,
	329	.rename = ufs_rename,
	330	};