[net-next-2.6.git] / fs / ufs / namei.c

/*
 * linux/fs/ufs/namei.c
 *
 * 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 <linux/ufs_fs.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include "swab.h"	/* will go away - see comment in mknod() */
#include "util.h"

/*
#undef UFS_NAMEI_DEBUG
*/
#define UFS_NAMEI_DEBUG

#ifdef UFS_NAMEI_DEBUG
#define UFSD(x) printk("(%s, %d), %s: ", __FILE__, __LINE__, __FUNCTION__); printk x;
#else
#define UFSD(x)
#endif

static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode)
{
	int err = ufs_add_link(dentry, inode);
	if (!err) {
		d_instantiate(dentry, inode);
		return 0;
	}
	inode_dec_link_count(inode);
	iput(inode);
	return err;
}

static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
{
	struct inode * inode = NULL;
	ino_t ino;
	
	if (dentry->d_name.len > UFS_MAXNAMLEN)
		return ERR_PTR(-ENAMETOOLONG);

	lock_kernel();
	ino = ufs_inode_by_name(dir, dentry);
	if (ino) {
		inode = iget(dir->i_sb, ino);
		if (!inode) {
			unlock_kernel();
			return ERR_PTR(-EACCES);
		}
	}
	unlock_kernel();
	d_add(dentry, inode);
	return NULL;
}

/*
 * 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, int mode,
		struct nameidata *nd)
{
	struct inode * inode = ufs_new_inode(dir, mode);
	int 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_kernel();
		err = ufs_add_nondir(dentry, inode);
		unlock_kernel();
	}
	return err;
}

static int ufs_mknod (struct inode * dir, struct dentry *dentry, int 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);
		/* NOTE: that'll go when we get wide dev_t */
		ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
		mark_inode_dirty(inode);
		lock_kernel();
		err = ufs_add_nondir(dentry, inode);
		unlock_kernel();
	}
	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;

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

	if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
		/* slow symlink */
		inode->i_op = &page_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((char*)&UFS_I(inode)->i_u1.i_data,symname,l);
		inode->i_size = l-1;
	}
	mark_inode_dirty(inode);

	err = ufs_add_nondir(dentry, inode);
out:
	unlock_kernel();
	return err;

out_fail:
	inode_dec_link_count(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_kernel();
	if (inode->i_nlink >= UFS_LINK_MAX) {
		unlock_kernel();
		return -EMLINK;
	}

	inode->i_ctime = CURRENT_TIME_SEC;
	inode_inc_link_count(inode);
	atomic_inc(&inode->i_count);

	error = ufs_add_nondir(dentry, inode);
	unlock_kernel();
	return error;
}

static int ufs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
{
	struct inode * inode;
	int err = -EMLINK;

	if (dir->i_nlink >= UFS_LINK_MAX)
		goto out;

	lock_kernel();
	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_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_kernel();

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

out_fail:
	inode_dec_link_count(inode);
	inode_dec_link_count(inode);
	iput (inode);
out_dir:
	inode_dec_link_count(dir);
	unlock_kernel();
	goto out;
}

static int ufs_unlink(struct inode * dir, struct dentry *dentry)
{
	struct inode * inode = dentry->d_inode;
	struct buffer_head * bh;
	struct ufs_dir_entry * de;
	int err = -ENOENT;

	lock_kernel();
	de = ufs_find_entry (dentry, &bh);
	if (!de)
		goto out;

	err = ufs_delete_entry (dir, de, bh);
	if (err)
		goto out;

	inode->i_ctime = dir->i_ctime;
	inode_dec_link_count(inode);
	err = 0;
out:
	unlock_kernel();
	return err;
}

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

	lock_kernel();
	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_kernel();
	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 buffer_head *dir_bh = NULL;
	struct ufs_dir_entry *dir_de = NULL;
	struct buffer_head *old_bh;
	struct ufs_dir_entry *old_de;
	int err = -ENOENT;

	lock_kernel();
	old_de = ufs_find_entry (old_dentry, &old_bh);
	if (!old_de)
		goto out;

	if (S_ISDIR(old_inode->i_mode)) {
		err = -EIO;
		dir_de = ufs_dotdot(old_inode, &dir_bh);
		if (!dir_de)
			goto out_old;
	}

	if (new_inode) {
		struct buffer_head *new_bh;
		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_dentry, &new_bh);
		if (!new_de)
			goto out_dir;
		inode_inc_link_count(old_inode);
		ufs_set_link(new_dir, new_de, new_bh, old_inode);
		new_inode->i_ctime = CURRENT_TIME_SEC;
		if (dir_de)
			new_inode->i_nlink--;
		inode_dec_link_count(new_inode);
	} else {
		if (dir_de) {
			err = -EMLINK;
			if (new_dir->i_nlink >= UFS_LINK_MAX)
				goto out_dir;
		}
		inode_inc_link_count(old_inode);
		err = ufs_add_link(new_dentry, old_inode);
		if (err) {
			inode_dec_link_count(old_inode);
			goto out_dir;
		}
		if (dir_de)
			inode_inc_link_count(new_dir);
	}

	ufs_delete_entry (old_dir, old_de, old_bh);

	inode_dec_link_count(old_inode);

	if (dir_de) {
		ufs_set_link(old_inode, dir_de, dir_bh, new_dir);
		inode_dec_link_count(old_dir);
	}
	unlock_kernel();
	return 0;

out_dir:
	if (dir_de)
		brelse(dir_bh);
out_old:
	brelse (old_bh);
out:
	unlock_kernel();
	return err;
}

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	*
	4	* Copyright (C) 1998
	5	* Daniel Pirkl <daniel.pirkl@email.cz>
	6	* Charles University, Faculty of Mathematics and Physics
	7	*
	8	* from
	9	*
	10	* linux/fs/ext2/namei.c
	11	*
	12	* Copyright (C) 1992, 1993, 1994, 1995
	13	* Remy Card (card@masi.ibp.fr)
	14	* Laboratoire MASI - Institut Blaise Pascal
	15	* Universite Pierre et Marie Curie (Paris VI)
	16	*
	17	* from
	18	*
	19	* linux/fs/minix/namei.c
	20	*
	21	* Copyright (C) 1991, 1992 Linus Torvalds
	22	*
	23	* Big-endian to little-endian byte-swapping/bitmaps by
	24	* David S. Miller (davem@caip.rutgers.edu), 1995
	25	*/
	26
	27	#include <linux/time.h>
	28	#include <linux/fs.h>
	29	#include <linux/ufs_fs.h>
	30	#include <linux/smp_lock.h>
	31	#include <linux/buffer_head.h>
	32	#include "swab.h" /* will go away - see comment in mknod() */
	33	#include "util.h"
	34
	35	/*
	36	#undef UFS_NAMEI_DEBUG
	37	*/
	38	#define UFS_NAMEI_DEBUG
	39
	40	#ifdef UFS_NAMEI_DEBUG
	41	#define UFSD(x) printk("(%s, %d), %s: ", __FILE__, __LINE__, __FUNCTION__); printk x;
	42	#else
	43	#define UFSD(x)
	44	#endif
	45
1da177e4 LT	46	static inline int ufs_add_nondir(struct dentry dentry, struct inode inode)
	47	{
	48	int err = ufs_add_link(dentry, inode);
	49	if (!err) {
	50	d_instantiate(dentry, inode);
	51	return 0;
	52	}
3257545e	53	inode_dec_link_count(inode);
1da177e4 LT	54	iput(inode);
	55	return err;
	56	}
	57
	58	static struct dentry ufs_lookup(struct inode dir, struct dentry dentry, struct nameidata nd)
	59	{
	60	struct inode * inode = NULL;
	61	ino_t ino;
	62
	63	if (dentry->d_name.len > UFS_MAXNAMLEN)
	64	return ERR_PTR(-ENAMETOOLONG);
	65
	66	lock_kernel();
	67	ino = ufs_inode_by_name(dir, dentry);
	68	if (ino) {
	69	inode = iget(dir->i_sb, ino);
	70	if (!inode) {
	71	unlock_kernel();
	72	return ERR_PTR(-EACCES);
	73	}
	74	}
	75	unlock_kernel();
	76	d_add(dentry, inode);
	77	return NULL;
	78	}
	79
	80	/*
	81	* By the time this is called, we already have created
	82	* the directory cache entry for the new file, but it
	83	* is so far negative - it has no inode.
	84	*
	85	* If the create succeeds, we fill in the inode information
	86	* with d_instantiate().
	87	*/
	88	static int ufs_create (struct inode * dir, struct dentry * dentry, int mode,
	89	struct nameidata *nd)
	90	{
	91	struct inode * inode = ufs_new_inode(dir, mode);
	92	int err = PTR_ERR(inode);
	93	if (!IS_ERR(inode)) {
	94	inode->i_op = &ufs_file_inode_operations;
	95	inode->i_fop = &ufs_file_operations;
	96	inode->i_mapping->a_ops = &ufs_aops;
	97	mark_inode_dirty(inode);
	98	lock_kernel();
	99	err = ufs_add_nondir(dentry, inode);
	100	unlock_kernel();
	101	}
	102	return err;
	103	}
	104
	105	static int ufs_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
	106	{
	107	struct inode *inode;
	108	int err;
	109
	110	if (!old_valid_dev(rdev))
	111	return -EINVAL;
	112	inode = ufs_new_inode(dir, mode);
	113	err = PTR_ERR(inode);
	114	if (!IS_ERR(inode)) {
	115	init_special_inode(inode, mode, rdev);
	116	/* NOTE: that'll go when we get wide dev_t */
	117	ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
118	mark_inode_dirty(inode);
119	lock_kernel();
120	err = ufs_add_nondir(dentry, inode);
121	unlock_kernel();
122	}
123	return err;
124	}
125
126	static int ufs_symlink (struct inode * dir, struct dentry * dentry,
127	const char * symname)
128	{
129	struct super_block * sb = dir->i_sb;
130	int err = -ENAMETOOLONG;
131	unsigned l = strlen(symname)+1;
132	struct inode * inode;
133
134	if (l > sb->s_blocksize)
135	goto out;
136
137	lock_kernel();
138	inode = ufs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
139	err = PTR_ERR(inode);
140	if (IS_ERR(inode))
141	goto out;
142
143	if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
144	/* slow symlink */
145	inode->i_op = &page_symlink_inode_operations;
146	inode->i_mapping->a_ops = &ufs_aops;
147	err = page_symlink(inode, symname, l);
148	if (err)
149	goto out_fail;
150	} else {
151	/* fast symlink */
152	inode->i_op = &ufs_fast_symlink_inode_operations;
153	memcpy((char*)&UFS_I(inode)->i_u1.i_data,symname,l);
154	inode->i_size = l-1;
155	}
156	mark_inode_dirty(inode);
157
158	err = ufs_add_nondir(dentry, inode);
159	out:
160	unlock_kernel();
161	return err;
162
163	out_fail:
3257545e	164	inode_dec_link_count(inode);
1da177e4 LT	165	iput(inode);
	166	goto out;
	167	}
	168
	169	static int ufs_link (struct dentry * old_dentry, struct inode * dir,
	170	struct dentry *dentry)
	171	{
	172	struct inode *inode = old_dentry->d_inode;
	173	int error;
	174
	175	lock_kernel();
	176	if (inode->i_nlink >= UFS_LINK_MAX) {
	177	unlock_kernel();
	178	return -EMLINK;
	179	}
	180
	181	inode->i_ctime = CURRENT_TIME_SEC;
3257545e	182	inode_inc_link_count(inode);
1da177e4 LT	183	atomic_inc(&inode->i_count);
	184
	185	error = ufs_add_nondir(dentry, inode);
	186	unlock_kernel();
	187	return error;
	188	}
	189
	190	static int ufs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
	191	{
	192	struct inode * inode;
	193	int err = -EMLINK;
	194
	195	if (dir->i_nlink >= UFS_LINK_MAX)
	196	goto out;
	197
	198	lock_kernel();
3257545e	199	inode_inc_link_count(dir);
1da177e4 LT	200
	201	inode = ufs_new_inode(dir, S_IFDIR\|mode);
	202	err = PTR_ERR(inode);
	203	if (IS_ERR(inode))
	204	goto out_dir;
	205
	206	inode->i_op = &ufs_dir_inode_operations;
	207	inode->i_fop = &ufs_dir_operations;
	208
3257545e	209	inode_inc_link_count(inode);
1da177e4 LT	210
	211	err = ufs_make_empty(inode, dir);
	212	if (err)
	213	goto out_fail;
	214
	215	err = ufs_add_link(dentry, inode);
	216	if (err)
	217	goto out_fail;
	218	unlock_kernel();
	219
	220	d_instantiate(dentry, inode);
	221	out:
	222	return err;
	223
	224	out_fail:
3257545e AD	225	inode_dec_link_count(inode);
3257545e AD	226	inode_dec_link_count(inode);
1da177e4 LT	227	iput (inode);
1da177e4 LT	228	out_dir:
3257545e	229	inode_dec_link_count(dir);
1da177e4 LT	230	unlock_kernel();
	231	goto out;
	232	}
	233
	234	static int ufs_unlink(struct inode * dir, struct dentry *dentry)
	235	{
	236	struct inode * inode = dentry->d_inode;
	237	struct buffer_head * bh;
	238	struct ufs_dir_entry * de;
	239	int err = -ENOENT;
	240
	241	lock_kernel();
	242	de = ufs_find_entry (dentry, &bh);
	243	if (!de)
	244	goto out;
	245
	246	err = ufs_delete_entry (dir, de, bh);
	247	if (err)
	248	goto out;
	249
	250	inode->i_ctime = dir->i_ctime;
3257545e	251	inode_dec_link_count(inode);
1da177e4 LT	252	err = 0;
	253	out:
	254	unlock_kernel();
	255	return err;
	256	}
	257
	258	static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
	259	{
	260	struct inode * inode = dentry->d_inode;
	261	int err= -ENOTEMPTY;
	262
	263	lock_kernel();
	264	if (ufs_empty_dir (inode)) {
	265	err = ufs_unlink(dir, dentry);
	266	if (!err) {
	267	inode->i_size = 0;
3257545e AD	268	inode_dec_link_count(inode);
3257545e AD	269	inode_dec_link_count(dir);
1da177e4 LT	270	}
	271	}
	272	unlock_kernel();
	273	return err;
	274	}
	275
	276	static int ufs_rename (struct inode * old_dir, struct dentry * old_dentry,
	277	struct inode * new_dir, struct dentry * new_dentry )
	278	{
	279	struct inode *old_inode = old_dentry->d_inode;
	280	struct inode *new_inode = new_dentry->d_inode;
	281	struct buffer_head *dir_bh = NULL;
	282	struct ufs_dir_entry *dir_de = NULL;
	283	struct buffer_head *old_bh;
	284	struct ufs_dir_entry *old_de;
	285	int err = -ENOENT;
	286
	287	lock_kernel();
	288	old_de = ufs_find_entry (old_dentry, &old_bh);
	289	if (!old_de)
	290	goto out;
	291
	292	if (S_ISDIR(old_inode->i_mode)) {
	293	err = -EIO;
	294	dir_de = ufs_dotdot(old_inode, &dir_bh);
	295	if (!dir_de)
	296	goto out_old;
	297	}
	298
	299	if (new_inode) {
	300	struct buffer_head *new_bh;
	301	struct ufs_dir_entry *new_de;
	302
	303	err = -ENOTEMPTY;
	304	if (dir_de && !ufs_empty_dir (new_inode))
	305	goto out_dir;
	306	err = -ENOENT;
	307	new_de = ufs_find_entry (new_dentry, &new_bh);
	308	if (!new_de)
	309	goto out_dir;
3257545e	310	inode_inc_link_count(old_inode);
1da177e4 LT	311	ufs_set_link(new_dir, new_de, new_bh, old_inode);
	312	new_inode->i_ctime = CURRENT_TIME_SEC;
	313	if (dir_de)
	314	new_inode->i_nlink--;
3257545e	315	inode_dec_link_count(new_inode);
1da177e4 LT	316	} else {
	317	if (dir_de) {
	318	err = -EMLINK;
	319	if (new_dir->i_nlink >= UFS_LINK_MAX)
	320	goto out_dir;
	321	}
3257545e	322	inode_inc_link_count(old_inode);
1da177e4 LT	323	err = ufs_add_link(new_dentry, old_inode);
1da177e4 LT	324	if (err) {
3257545e	325	inode_dec_link_count(old_inode);
1da177e4 LT	326	goto out_dir;
	327	}
	328	if (dir_de)
3257545e	329	inode_inc_link_count(new_dir);
1da177e4 LT	330	}
	331
	332	ufs_delete_entry (old_dir, old_de, old_bh);
	333
3257545e	334	inode_dec_link_count(old_inode);
1da177e4 LT	335
	336	if (dir_de) {
	337	ufs_set_link(old_inode, dir_de, dir_bh, new_dir);
3257545e	338	inode_dec_link_count(old_dir);
1da177e4 LT	339	}
	340	unlock_kernel();
	341	return 0;
	342
	343	out_dir:
	344	if (dir_de)
	345	brelse(dir_bh);
	346	out_old:
	347	brelse (old_bh);
	348	out:
	349	unlock_kernel();
	350	return err;
	351	}
	352
	353	struct inode_operations ufs_dir_inode_operations = {
	354	.create = ufs_create,
	355	.lookup = ufs_lookup,
	356	.link = ufs_link,
	357	.unlink = ufs_unlink,
	358	.symlink = ufs_symlink,
	359	.mkdir = ufs_mkdir,
	360	.rmdir = ufs_rmdir,
	361	.mknod = ufs_mknod,
	362	.rename = ufs_rename,
	363	};