[linux.git] / fs / ufs / namei.c

/*
 * 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) {
		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_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,
		      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_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);
			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
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 <[email protected]> based on ext2 code base.
	6	*
1da177e4 LT	7	* Copyright (C) 1998
	8	* Daniel Pirkl <[email protected]>
	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 ([email protected])
	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 ([email protected]), 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 */
9cdce3c0	126	inode->i_op = &page_symlink_inode_operations;
21fc61c7	127	inode_nohighmem(inode);
1da177e4 LT	128	inode->i_mapping->a_ops = &ufs_aops;
	129	err = page_symlink(inode, symname, l);
	130	if (err)
	131	goto out_fail;
	132	} else {
	133	/* fast symlink */
9cdce3c0	134	inode->i_op = &simple_symlink_inode_operations;
4b8061a6 AV	135	inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
4b8061a6 AV	136	memcpy(inode->i_link, symname, l);
1da177e4 LT	137	inode->i_size = l-1;
	138	}
	139	mark_inode_dirty(inode);
	140
a50e4a02	141	return ufs_add_nondir(dentry, inode);
1da177e4 LT	142
1da177e4 LT	143	out_fail:
3257545e	144	inode_dec_link_count(inode);
e4502c63	145	unlock_new_inode(inode);
1da177e4	146	iput(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
1da177e4	156	inode->i_ctime = CURRENT_TIME_SEC;
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
18bb1db3	169	static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
1da177e4 LT	170	{
1da177e4 LT	171	struct inode * inode;
8de52778	172	int err;
1da177e4	173
13b987ea FF	174	inode_inc_link_count(dir);
13b987ea FF	175
1da177e4	176	inode = ufs_new_inode(dir, S_IFDIR\|mode);
13b987ea	177	err = PTR_ERR(inode);
1da177e4	178	if (IS_ERR(inode))
13b987ea	179	goto out_dir;
1da177e4 LT	180
	181	inode->i_op = &ufs_dir_inode_operations;
	182	inode->i_fop = &ufs_dir_operations;
826843a3	183	inode->i_mapping->a_ops = &ufs_aops;
1da177e4	184
3257545e	185	inode_inc_link_count(inode);
1da177e4 LT	186
	187	err = ufs_make_empty(inode, dir);
	188	if (err)
	189	goto out_fail;
	190
	191	err = ufs_add_link(dentry, inode);
	192	if (err)
	193	goto out_fail;
1da177e4	194
514d748f	195	unlock_new_inode(inode);
1da177e4	196	d_instantiate(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);
e4502c63	202	unlock_new_inode(inode);
1da177e4	203	iput (inode);
13b987ea	204	out_dir:
3257545e	205	inode_dec_link_count(dir);
a50e4a02	206	return err;
1da177e4 LT	207	}
1da177e4 LT	208
b71034e5	209	static int ufs_unlink(struct inode dir, struct dentry dentry)
1da177e4	210	{
2b0143b5	211	struct inode * inode = d_inode(dentry);
b71034e5 ED	212	struct ufs_dir_entry *de;
b71034e5 ED	213	struct page *page;
1da177e4 LT	214	int err = -ENOENT;
1da177e4 LT	215
08049707	216	de = ufs_find_entry(dir, &dentry->d_name, &page);
1da177e4 LT	217	if (!de)
	218	goto out;
	219
b71034e5	220	err = ufs_delete_entry(dir, de, page);
1da177e4 LT	221	if (err)
	222	goto out;
	223
	224	inode->i_ctime = dir->i_ctime;
3257545e	225	inode_dec_link_count(inode);
1da177e4 LT	226	err = 0;
1da177e4 LT	227	out:
1da177e4 LT	228	return err;
	229	}
	230
	231	static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
	232	{
2b0143b5	233	struct inode * inode = d_inode(dentry);
1da177e4 LT	234	int err= -ENOTEMPTY;
1da177e4 LT	235
1da177e4 LT	236	if (ufs_empty_dir (inode)) {
	237	err = ufs_unlink(dir, dentry);
	238	if (!err) {
	239	inode->i_size = 0;
3257545e AD	240	inode_dec_link_count(inode);
3257545e AD	241	inode_dec_link_count(dir);
1da177e4 LT	242	}
1da177e4 LT	243	}
1da177e4 LT	244	return err;
	245	}
	246
b71034e5	247	static int ufs_rename(struct inode old_dir, struct dentry old_dentry,
f03b8ad8 MS	248	struct inode new_dir, struct dentry new_dentry,
f03b8ad8 MS	249	unsigned int flags)
1da177e4	250	{
2b0143b5 DH	251	struct inode *old_inode = d_inode(old_dentry);
2b0143b5 DH	252	struct inode *new_inode = d_inode(new_dentry);
b71034e5 ED	253	struct page *dir_page = NULL;
	254	struct ufs_dir_entry * dir_de = NULL;
	255	struct page *old_page;
1da177e4 LT	256	struct ufs_dir_entry *old_de;
	257	int err = -ENOENT;
	258
f03b8ad8 MS	259	if (flags & ~RENAME_NOREPLACE)
	260	return -EINVAL;
	261
08049707	262	old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1da177e4 LT	263	if (!old_de)
	264	goto out;
	265
	266	if (S_ISDIR(old_inode->i_mode)) {
	267	err = -EIO;
b71034e5	268	dir_de = ufs_dotdot(old_inode, &dir_page);
1da177e4 LT	269	if (!dir_de)
	270	goto out_old;
	271	}
	272
	273	if (new_inode) {
b71034e5	274	struct page *new_page;
1da177e4 LT	275	struct ufs_dir_entry *new_de;
	276
	277	err = -ENOTEMPTY;
b71034e5	278	if (dir_de && !ufs_empty_dir(new_inode))
1da177e4	279	goto out_dir;
b71034e5	280
1da177e4	281	err = -ENOENT;
08049707	282	new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1da177e4 LT	283	if (!new_de)
1da177e4 LT	284	goto out_dir;
70d45cdb	285	ufs_set_link(new_dir, new_de, new_page, old_inode, 1);
1da177e4 LT	286	new_inode->i_ctime = CURRENT_TIME_SEC;
1da177e4 LT	287	if (dir_de)
9a53c3a7	288	drop_nlink(new_inode);
3257545e	289	inode_dec_link_count(new_inode);
1da177e4	290	} else {
1da177e4	291	err = ufs_add_link(new_dentry, old_inode);
37750cdd	292	if (err)
1da177e4	293	goto out_dir;
1da177e4	294	if (dir_de)
3257545e	295	inode_inc_link_count(new_dir);
1da177e4 LT	296	}
1da177e4 LT	297
b71034e5 ED	298	/*
	299	* Like most other Unix systems, set the ctime for inodes on a
	300	* rename.
b71034e5 ED	301	*/
b71034e5 ED	302	old_inode->i_ctime = CURRENT_TIME_SEC;
1da177e4	303
b71034e5	304	ufs_delete_entry(old_dir, old_de, old_page);
37750cdd	305	mark_inode_dirty(old_inode);
1da177e4 LT	306
1da177e4 LT	307	if (dir_de) {
70d45cdb AV	308	if (old_dir != new_dir)
	309	ufs_set_link(old_inode, dir_de, dir_page, new_dir, 0);
	310	else {
	311	kunmap(dir_page);
09cbfeaf	312	put_page(dir_page);
70d45cdb	313	}
3257545e	314	inode_dec_link_count(old_dir);
1da177e4	315	}
1da177e4 LT	316	return 0;
1da177e4 LT	317
b71034e5	318
1da177e4	319	out_dir:
b71034e5 ED	320	if (dir_de) {
b71034e5 ED	321	kunmap(dir_page);
09cbfeaf	322	put_page(dir_page);
b71034e5	323	}
1da177e4	324	out_old:
b71034e5	325	kunmap(old_page);
09cbfeaf	326	put_page(old_page);
1da177e4	327	out:
1da177e4 LT	328	return err;
	329	}
	330
c5ef1c42	331	const struct inode_operations ufs_dir_inode_operations = {
1da177e4 LT	332	.create = ufs_create,
	333	.lookup = ufs_lookup,
	334	.link = ufs_link,
	335	.unlink = ufs_unlink,
	336	.symlink = ufs_symlink,
	337	.mkdir = ufs_mkdir,
	338	.rmdir = ufs_rmdir,
	339	.mknod = ufs_mknod,
2773bf00	340	.rename = ufs_rename,
1da177e4	341	};