[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);

	lock_ufs(dir->i_sb);
	ino = ufs_inode_by_name(dir, &dentry->d_name);
	if (ino)
		inode = ufs_iget(dir->i_sb, ino);
	unlock_ufs(dir->i_sb);
	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;
	int err;

	UFSD("BEGIN\n");

	inode = ufs_new_inode(dir, mode);
	err = PTR_ERR(inode);

	if (!IS_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);
		lock_ufs(dir->i_sb);
		err = ufs_add_nondir(dentry, inode);
		unlock_ufs(dir->i_sb);
	}
	UFSD("END: err=%d\n", err);
	return err;
}

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);
		lock_ufs(dir->i_sb);
		err = ufs_add_nondir(dentry, inode);
		unlock_ufs(dir->i_sb);
	}
	return err;
}

static int ufs_symlink (struct inode * dir, struct dentry * dentry,
	const char * symname)
{
	struct super_block * sb = dir->i_sb;
	int err = -ENAMETOOLONG;
	unsigned l = strlen(symname)+1;
	struct inode * inode;

	if (l > sb->s_blocksize)
		goto out_notlocked;

	inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
	err = PTR_ERR(inode);
	if (IS_ERR(inode))
		goto out_notlocked;

	lock_ufs(dir->i_sb);
	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);

	err = ufs_add_nondir(dentry, inode);
out:
	unlock_ufs(dir->i_sb);
out_notlocked:
	return err;

out_fail:
	inode_dec_link_count(inode);
	unlock_new_inode(inode);
	iput(inode);
	goto out;
}

static int ufs_link (struct dentry * old_dentry, struct inode * dir,
	struct dentry *dentry)
{
	struct inode *inode = old_dentry->d_inode;
	int error;

	lock_ufs(dir->i_sb);

	inode->i_ctime = CURRENT_TIME_SEC;
	inode_inc_link_count(inode);
	ihold(inode);

	error = ufs_add_nondir(dentry, inode);
	unlock_ufs(dir->i_sb);
	return error;
}

static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
{
	struct inode * inode;
	int err;

	inode = ufs_new_inode(dir, S_IFDIR|mode);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	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);

	lock_ufs(dir->i_sb);
	inode_inc_link_count(dir);

	err = ufs_make_empty(inode, dir);
	if (err)
		goto out_fail;

	err = ufs_add_link(dentry, inode);
	if (err)
		goto out_fail;
	unlock_ufs(dir->i_sb);

	d_instantiate(dentry, inode);
out:
	return err;

out_fail:
	inode_dec_link_count(inode);
	inode_dec_link_count(inode);
	unlock_new_inode(inode);
	iput (inode);
	inode_dec_link_count(dir);
	unlock_ufs(dir->i_sb);
	goto out;
}

static int ufs_unlink(struct inode *dir, struct dentry *dentry)
{
	struct inode * inode = dentry->d_inode;
	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 = dentry->d_inode;
	int err= -ENOTEMPTY;

	lock_ufs(dir->i_sb);
	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);
		}
	}
	unlock_ufs(dir->i_sb);
	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 = old_dentry->d_inode;
	struct inode *new_inode = new_dentry->d_inode;
	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 <[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
788257d6	59	lock_ufs(dir->i_sb);
08049707	60	ino = ufs_inode_by_name(dir, &dentry->d_name);
642c937b	61	if (ino)
b55c460d	62	inode = ufs_iget(dir->i_sb, ino);
788257d6	63	unlock_ufs(dir->i_sb);
642c937b	64	return d_splice_alias(inode, dentry);
1da177e4 LT	65	}
	66
	67	/*
	68	* By the time this is called, we already have created
	69	* the directory cache entry for the new file, but it
	70	* is so far negative - it has no inode.
	71	*
	72	* If the create succeeds, we fill in the inode information
	73	* with d_instantiate().
	74	*/
4acdaf27	75	static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode,
ebfc3b49	76	bool excl)
1da177e4	77	{
abf5d15f ED	78	struct inode *inode;
	79	int err;
	80
	81	UFSD("BEGIN\n");
907f4554	82
abf5d15f ED	83	inode = ufs_new_inode(dir, mode);
	84	err = PTR_ERR(inode);
	85
1da177e4 LT	86	if (!IS_ERR(inode)) {
	87	inode->i_op = &ufs_file_inode_operations;
	88	inode->i_fop = &ufs_file_operations;
	89	inode->i_mapping->a_ops = &ufs_aops;
	90	mark_inode_dirty(inode);
788257d6	91	lock_ufs(dir->i_sb);
1da177e4	92	err = ufs_add_nondir(dentry, inode);
788257d6	93	unlock_ufs(dir->i_sb);
1da177e4	94	}
abf5d15f	95	UFSD("END: err=%d\n", err);
1da177e4 LT	96	return err;
	97	}
	98
1a67aafb	99	static int ufs_mknod(struct inode dir, struct dentry dentry, umode_t mode, dev_t rdev)
1da177e4 LT	100	{
	101	struct inode *inode;
	102	int err;
	103
	104	if (!old_valid_dev(rdev))
	105	return -EINVAL;
907f4554	106
1da177e4 LT	107	inode = ufs_new_inode(dir, mode);
	108	err = PTR_ERR(inode);
	109	if (!IS_ERR(inode)) {
	110	init_special_inode(inode, mode, rdev);
1da177e4 LT	111	ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
1da177e4 LT	112	mark_inode_dirty(inode);
788257d6	113	lock_ufs(dir->i_sb);
1da177e4	114	err = ufs_add_nondir(dentry, inode);
788257d6	115	unlock_ufs(dir->i_sb);
1da177e4 LT	116	}
	117	return err;
	118	}
	119
	120	static int ufs_symlink (struct inode * dir, struct dentry * dentry,
	121	const char * symname)
	122	{
	123	struct super_block * sb = dir->i_sb;
	124	int err = -ENAMETOOLONG;
	125	unsigned l = strlen(symname)+1;
	126	struct inode * inode;
	127
	128	if (l > sb->s_blocksize)
344fe786	129	goto out_notlocked;
1da177e4	130
1da177e4 LT	131	inode = ufs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	132	err = PTR_ERR(inode);
	133	if (IS_ERR(inode))
9ef7db7f	134	goto out_notlocked;
1da177e4	135
9ef7db7f	136	lock_ufs(dir->i_sb);
1da177e4 LT	137	if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
1da177e4 LT	138	/* slow symlink */
311b9549	139	inode->i_op = &ufs_symlink_inode_operations;
1da177e4 LT	140	inode->i_mapping->a_ops = &ufs_aops;
	141	err = page_symlink(inode, symname, l);
	142	if (err)
	143	goto out_fail;
	144	} else {
	145	/* fast symlink */
	146	inode->i_op = &ufs_fast_symlink_inode_operations;
723be1f3	147	memcpy(UFS_I(inode)->i_u1.i_symlink, symname, l);
1da177e4 LT	148	inode->i_size = l-1;
	149	}
	150	mark_inode_dirty(inode);
	151
	152	err = ufs_add_nondir(dentry, inode);
	153	out:
788257d6	154	unlock_ufs(dir->i_sb);
344fe786	155	out_notlocked:
1da177e4 LT	156	return err;
	157
	158	out_fail:
3257545e	159	inode_dec_link_count(inode);
e4502c63	160	unlock_new_inode(inode);
1da177e4 LT	161	iput(inode);
	162	goto out;
	163	}
	164
	165	static int ufs_link (struct dentry * old_dentry, struct inode * dir,
	166	struct dentry *dentry)
	167	{
	168	struct inode *inode = old_dentry->d_inode;
	169	int error;
	170
788257d6	171	lock_ufs(dir->i_sb);
1da177e4 LT	172
1da177e4 LT	173	inode->i_ctime = CURRENT_TIME_SEC;
3257545e	174	inode_inc_link_count(inode);
7de9c6ee	175	ihold(inode);
1da177e4 LT	176
1da177e4 LT	177	error = ufs_add_nondir(dentry, inode);
788257d6	178	unlock_ufs(dir->i_sb);
1da177e4 LT	179	return error;
	180	}
	181
18bb1db3	182	static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
1da177e4 LT	183	{
1da177e4 LT	184	struct inode * inode;
8de52778	185	int err;
1da177e4	186
1da177e4	187	inode = ufs_new_inode(dir, S_IFDIR\|mode);
1da177e4	188	if (IS_ERR(inode))
9ef7db7f	189	return PTR_ERR(inode);
1da177e4 LT	190
	191	inode->i_op = &ufs_dir_inode_operations;
	192	inode->i_fop = &ufs_dir_operations;
826843a3	193	inode->i_mapping->a_ops = &ufs_aops;
1da177e4	194
3257545e	195	inode_inc_link_count(inode);
1da177e4	196
9ef7db7f AK	197	lock_ufs(dir->i_sb);
	198	inode_inc_link_count(dir);
	199
1da177e4 LT	200	err = ufs_make_empty(inode, dir);
	201	if (err)
	202	goto out_fail;
	203
	204	err = ufs_add_link(dentry, inode);
	205	if (err)
	206	goto out_fail;
788257d6	207	unlock_ufs(dir->i_sb);
1da177e4 LT	208
	209	d_instantiate(dentry, inode);
	210	out:
	211	return err;
	212
	213	out_fail:
3257545e AD	214	inode_dec_link_count(inode);
3257545e AD	215	inode_dec_link_count(inode);
e4502c63	216	unlock_new_inode(inode);
1da177e4	217	iput (inode);
3257545e	218	inode_dec_link_count(dir);
788257d6	219	unlock_ufs(dir->i_sb);
1da177e4 LT	220	goto out;
	221	}
	222
b71034e5	223	static int ufs_unlink(struct inode dir, struct dentry dentry)
1da177e4 LT	224	{
1da177e4 LT	225	struct inode * inode = dentry->d_inode;
b71034e5 ED	226	struct ufs_dir_entry *de;
b71034e5 ED	227	struct page *page;
1da177e4 LT	228	int err = -ENOENT;
1da177e4 LT	229
08049707	230	de = ufs_find_entry(dir, &dentry->d_name, &page);
1da177e4 LT	231	if (!de)
	232	goto out;
	233
b71034e5	234	err = ufs_delete_entry(dir, de, page);
1da177e4 LT	235	if (err)
	236	goto out;
	237
	238	inode->i_ctime = dir->i_ctime;
3257545e	239	inode_dec_link_count(inode);
1da177e4 LT	240	err = 0;
1da177e4 LT	241	out:
1da177e4 LT	242	return err;
	243	}
	244
	245	static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
	246	{
	247	struct inode * inode = dentry->d_inode;
	248	int err= -ENOTEMPTY;
	249
788257d6	250	lock_ufs(dir->i_sb);
1da177e4 LT	251	if (ufs_empty_dir (inode)) {
	252	err = ufs_unlink(dir, dentry);
	253	if (!err) {
	254	inode->i_size = 0;
3257545e AD	255	inode_dec_link_count(inode);
3257545e AD	256	inode_dec_link_count(dir);
1da177e4 LT	257	}
1da177e4 LT	258	}
788257d6	259	unlock_ufs(dir->i_sb);
1da177e4 LT	260	return err;
	261	}
	262
b71034e5 ED	263	static int ufs_rename(struct inode old_dir, struct dentry old_dentry,
b71034e5 ED	264	struct inode new_dir, struct dentry new_dentry)
1da177e4 LT	265	{
	266	struct inode *old_inode = old_dentry->d_inode;
	267	struct inode *new_inode = new_dentry->d_inode;
b71034e5 ED	268	struct page *dir_page = NULL;
	269	struct ufs_dir_entry * dir_de = NULL;
	270	struct page *old_page;
1da177e4 LT	271	struct ufs_dir_entry *old_de;
	272	int err = -ENOENT;
	273
08049707	274	old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1da177e4 LT	275	if (!old_de)
	276	goto out;
	277
	278	if (S_ISDIR(old_inode->i_mode)) {
	279	err = -EIO;
b71034e5	280	dir_de = ufs_dotdot(old_inode, &dir_page);
1da177e4 LT	281	if (!dir_de)
	282	goto out_old;
	283	}
	284
	285	if (new_inode) {
b71034e5	286	struct page *new_page;
1da177e4 LT	287	struct ufs_dir_entry *new_de;
	288
	289	err = -ENOTEMPTY;
b71034e5	290	if (dir_de && !ufs_empty_dir(new_inode))
1da177e4	291	goto out_dir;
b71034e5	292
1da177e4	293	err = -ENOENT;
08049707	294	new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1da177e4 LT	295	if (!new_de)
1da177e4 LT	296	goto out_dir;
b71034e5	297	ufs_set_link(new_dir, new_de, new_page, old_inode);
1da177e4 LT	298	new_inode->i_ctime = CURRENT_TIME_SEC;
1da177e4 LT	299	if (dir_de)
9a53c3a7	300	drop_nlink(new_inode);
3257545e	301	inode_dec_link_count(new_inode);
1da177e4	302	} else {
1da177e4	303	err = ufs_add_link(new_dentry, old_inode);
37750cdd	304	if (err)
1da177e4	305	goto out_dir;
1da177e4	306	if (dir_de)
3257545e	307	inode_inc_link_count(new_dir);
1da177e4 LT	308	}
1da177e4 LT	309
b71034e5 ED	310	/*
	311	* Like most other Unix systems, set the ctime for inodes on a
	312	* rename.
b71034e5 ED	313	*/
b71034e5 ED	314	old_inode->i_ctime = CURRENT_TIME_SEC;
1da177e4	315
b71034e5	316	ufs_delete_entry(old_dir, old_de, old_page);
37750cdd	317	mark_inode_dirty(old_inode);
1da177e4 LT	318
1da177e4 LT	319	if (dir_de) {
b71034e5	320	ufs_set_link(old_inode, dir_de, dir_page, new_dir);
3257545e	321	inode_dec_link_count(old_dir);
1da177e4	322	}
1da177e4 LT	323	return 0;
1da177e4 LT	324
b71034e5	325
1da177e4	326	out_dir:
b71034e5 ED	327	if (dir_de) {
	328	kunmap(dir_page);
	329	page_cache_release(dir_page);
	330	}
1da177e4	331	out_old:
b71034e5 ED	332	kunmap(old_page);
b71034e5 ED	333	page_cache_release(old_page);
1da177e4	334	out:
1da177e4 LT	335	return err;
	336	}
	337
c5ef1c42	338	const struct inode_operations ufs_dir_inode_operations = {
1da177e4 LT	339	.create = ufs_create,
	340	.lookup = ufs_lookup,
	341	.link = ufs_link,
	342	.unlink = ufs_unlink,
	343	.symlink = ufs_symlink,
	344	.mkdir = ufs_mkdir,
	345	.rmdir = ufs_rmdir,
	346	.mknod = ufs_mknod,
	347	.rename = ufs_rename,
	348	};