[linux-2.6-block.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;
		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;

	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, 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,
};
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;
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);
e4502c63	144	unlock_new_inode(inode);
1da177e4	145	iput(inode);
a50e4a02	146	return err;
1da177e4 LT	147	}
	148
	149	static int ufs_link (struct dentry * old_dentry, struct inode * dir,
	150	struct dentry *dentry)
	151	{
2b0143b5	152	struct inode *inode = d_inode(old_dentry);
1da177e4 LT	153	int error;
1da177e4 LT	154
1da177e4	155	inode->i_ctime = CURRENT_TIME_SEC;
3257545e	156	inode_inc_link_count(inode);
7de9c6ee	157	ihold(inode);
1da177e4	158
12ecbb4b JK	159	error = ufs_add_link(dentry, inode);
	160	if (error) {
	161	inode_dec_link_count(inode);
	162	iput(inode);
	163	} else
	164	d_instantiate(dentry, inode);
1da177e4 LT	165	return error;
	166	}
	167
18bb1db3	168	static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
1da177e4 LT	169	{
1da177e4 LT	170	struct inode * inode;
8de52778	171	int err;
1da177e4	172
13b987ea FF	173	inode_inc_link_count(dir);
13b987ea FF	174
1da177e4	175	inode = ufs_new_inode(dir, S_IFDIR\|mode);
13b987ea	176	err = PTR_ERR(inode);
1da177e4	177	if (IS_ERR(inode))
13b987ea	178	goto out_dir;
1da177e4 LT	179
	180	inode->i_op = &ufs_dir_inode_operations;
	181	inode->i_fop = &ufs_dir_operations;
826843a3	182	inode->i_mapping->a_ops = &ufs_aops;
1da177e4	183
3257545e	184	inode_inc_link_count(inode);
1da177e4 LT	185
	186	err = ufs_make_empty(inode, dir);
	187	if (err)
	188	goto out_fail;
	189
	190	err = ufs_add_link(dentry, inode);
	191	if (err)
	192	goto out_fail;
1da177e4	193
514d748f	194	unlock_new_inode(inode);
1da177e4	195	d_instantiate(dentry, inode);
a50e4a02	196	return 0;
1da177e4 LT	197
1da177e4 LT	198	out_fail:
3257545e AD	199	inode_dec_link_count(inode);
3257545e AD	200	inode_dec_link_count(inode);
e4502c63	201	unlock_new_inode(inode);
1da177e4	202	iput (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
	223	inode->i_ctime = dir->i_ctime;
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
b71034e5 ED	246	static int ufs_rename(struct inode old_dir, struct dentry old_dentry,
b71034e5 ED	247	struct inode new_dir, struct dentry new_dentry)
1da177e4	248	{
2b0143b5 DH	249	struct inode *old_inode = d_inode(old_dentry);
2b0143b5 DH	250	struct inode *new_inode = d_inode(new_dentry);
b71034e5 ED	251	struct page *dir_page = NULL;
	252	struct ufs_dir_entry * dir_de = NULL;
	253	struct page *old_page;
1da177e4 LT	254	struct ufs_dir_entry *old_de;
	255	int err = -ENOENT;
	256
08049707	257	old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1da177e4 LT	258	if (!old_de)
	259	goto out;
	260
	261	if (S_ISDIR(old_inode->i_mode)) {
	262	err = -EIO;
b71034e5	263	dir_de = ufs_dotdot(old_inode, &dir_page);
1da177e4 LT	264	if (!dir_de)
	265	goto out_old;
	266	}
	267
	268	if (new_inode) {
b71034e5	269	struct page *new_page;
1da177e4 LT	270	struct ufs_dir_entry *new_de;
	271
	272	err = -ENOTEMPTY;
b71034e5	273	if (dir_de && !ufs_empty_dir(new_inode))
1da177e4	274	goto out_dir;
b71034e5	275
1da177e4	276	err = -ENOENT;
08049707	277	new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1da177e4 LT	278	if (!new_de)
1da177e4 LT	279	goto out_dir;
70d45cdb	280	ufs_set_link(new_dir, new_de, new_page, old_inode, 1);
1da177e4 LT	281	new_inode->i_ctime = CURRENT_TIME_SEC;
1da177e4 LT	282	if (dir_de)
9a53c3a7	283	drop_nlink(new_inode);
3257545e	284	inode_dec_link_count(new_inode);
1da177e4	285	} else {
1da177e4	286	err = ufs_add_link(new_dentry, old_inode);
37750cdd	287	if (err)
1da177e4	288	goto out_dir;
1da177e4	289	if (dir_de)
3257545e	290	inode_inc_link_count(new_dir);
1da177e4 LT	291	}
1da177e4 LT	292
b71034e5 ED	293	/*
	294	* Like most other Unix systems, set the ctime for inodes on a
	295	* rename.
b71034e5 ED	296	*/
b71034e5 ED	297	old_inode->i_ctime = CURRENT_TIME_SEC;
1da177e4	298
b71034e5	299	ufs_delete_entry(old_dir, old_de, old_page);
37750cdd	300	mark_inode_dirty(old_inode);
1da177e4 LT	301
1da177e4 LT	302	if (dir_de) {
70d45cdb AV	303	if (old_dir != new_dir)
	304	ufs_set_link(old_inode, dir_de, dir_page, new_dir, 0);
	305	else {
	306	kunmap(dir_page);
	307	page_cache_release(dir_page);
	308	}
3257545e	309	inode_dec_link_count(old_dir);
1da177e4	310	}
1da177e4 LT	311	return 0;
1da177e4 LT	312
b71034e5	313
1da177e4	314	out_dir:
b71034e5 ED	315	if (dir_de) {
	316	kunmap(dir_page);
	317	page_cache_release(dir_page);
	318	}
1da177e4	319	out_old:
b71034e5 ED	320	kunmap(old_page);
b71034e5 ED	321	page_cache_release(old_page);
1da177e4	322	out:
1da177e4 LT	323	return err;
	324	}
	325
c5ef1c42	326	const struct inode_operations ufs_dir_inode_operations = {
1da177e4 LT	327	.create = ufs_create,
	328	.lookup = ufs_lookup,
	329	.link = ufs_link,
	330	.unlink = ufs_unlink,
	331	.symlink = ufs_symlink,
	332	.mkdir = ufs_mkdir,
	333	.rmdir = ufs_rmdir,
	334	.mknod = ufs_mknod,
	335	.rename = ufs_rename,
	336	};