[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) {
		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, 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;

	lock_ufs(dir->i_sb);
	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 = &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);
	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;

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

	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_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) {
	41	d_instantiate(dentry, inode);
	42	return 0;
	43	}
3257545e	44	inode_dec_link_count(inode);
1da177e4 LT	45	iput(inode);
	46	return err;
	47	}
	48
00cd8dd3	49	static struct dentry ufs_lookup(struct inode dir, struct dentry *dentry, unsigned int flags)
1da177e4 LT	50	{
	51	struct inode * inode = NULL;
	52	ino_t ino;
	53
	54	if (dentry->d_name.len > UFS_MAXNAMLEN)
	55	return ERR_PTR(-ENAMETOOLONG);
	56
788257d6	57	lock_ufs(dir->i_sb);
08049707	58	ino = ufs_inode_by_name(dir, &dentry->d_name);
642c937b	59	if (ino)
b55c460d	60	inode = ufs_iget(dir->i_sb, ino);
788257d6	61	unlock_ufs(dir->i_sb);
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 ED	76	struct inode *inode;
	77	int err;
	78
	79	UFSD("BEGIN\n");
907f4554	80
abf5d15f ED	81	inode = ufs_new_inode(dir, mode);
	82	err = PTR_ERR(inode);
	83
1da177e4 LT	84	if (!IS_ERR(inode)) {
	85	inode->i_op = &ufs_file_inode_operations;
	86	inode->i_fop = &ufs_file_operations;
	87	inode->i_mapping->a_ops = &ufs_aops;
	88	mark_inode_dirty(inode);
788257d6	89	lock_ufs(dir->i_sb);
1da177e4	90	err = ufs_add_nondir(dentry, inode);
788257d6	91	unlock_ufs(dir->i_sb);
1da177e4	92	}
abf5d15f	93	UFSD("END: err=%d\n", err);
1da177e4 LT	94	return err;
	95	}
	96
1a67aafb	97	static int ufs_mknod(struct inode dir, struct dentry dentry, umode_t mode, dev_t rdev)
1da177e4 LT	98	{
	99	struct inode *inode;
	100	int err;
	101
	102	if (!old_valid_dev(rdev))
	103	return -EINVAL;
907f4554	104
1da177e4 LT	105	inode = ufs_new_inode(dir, mode);
	106	err = PTR_ERR(inode);
	107	if (!IS_ERR(inode)) {
	108	init_special_inode(inode, mode, rdev);
1da177e4 LT	109	ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
1da177e4 LT	110	mark_inode_dirty(inode);
788257d6	111	lock_ufs(dir->i_sb);
1da177e4	112	err = ufs_add_nondir(dentry, inode);
788257d6	113	unlock_ufs(dir->i_sb);
1da177e4 LT	114	}
	115	return err;
	116	}
	117
	118	static int ufs_symlink (struct inode * dir, struct dentry * dentry,
	119	const char * symname)
	120	{
	121	struct super_block * sb = dir->i_sb;
	122	int err = -ENAMETOOLONG;
	123	unsigned l = strlen(symname)+1;
	124	struct inode * inode;
	125
	126	if (l > sb->s_blocksize)
344fe786	127	goto out_notlocked;
1da177e4	128
788257d6	129	lock_ufs(dir->i_sb);
1da177e4 LT	130	inode = ufs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	131	err = PTR_ERR(inode);
	132	if (IS_ERR(inode))
	133	goto out;
	134
	135	if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
	136	/* slow symlink */
311b9549	137	inode->i_op = &ufs_symlink_inode_operations;
1da177e4 LT	138	inode->i_mapping->a_ops = &ufs_aops;
	139	err = page_symlink(inode, symname, l);
	140	if (err)
	141	goto out_fail;
	142	} else {
	143	/* fast symlink */
	144	inode->i_op = &ufs_fast_symlink_inode_operations;
723be1f3	145	memcpy(UFS_I(inode)->i_u1.i_symlink, symname, l);
1da177e4 LT	146	inode->i_size = l-1;
	147	}
	148	mark_inode_dirty(inode);
	149
	150	err = ufs_add_nondir(dentry, inode);
	151	out:
788257d6	152	unlock_ufs(dir->i_sb);
344fe786	153	out_notlocked:
1da177e4 LT	154	return err;
	155
	156	out_fail:
3257545e	157	inode_dec_link_count(inode);
1da177e4 LT	158	iput(inode);
	159	goto out;
	160	}
	161
	162	static int ufs_link (struct dentry * old_dentry, struct inode * dir,
	163	struct dentry *dentry)
	164	{
	165	struct inode *inode = old_dentry->d_inode;
	166	int error;
	167
788257d6	168	lock_ufs(dir->i_sb);
1da177e4 LT	169
1da177e4 LT	170	inode->i_ctime = CURRENT_TIME_SEC;
3257545e	171	inode_inc_link_count(inode);
7de9c6ee	172	ihold(inode);
1da177e4 LT	173
1da177e4 LT	174	error = ufs_add_nondir(dentry, inode);
788257d6	175	unlock_ufs(dir->i_sb);
1da177e4 LT	176	return error;
	177	}
	178
18bb1db3	179	static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
1da177e4 LT	180	{
1da177e4 LT	181	struct inode * inode;
8de52778	182	int err;
1da177e4	183
788257d6	184	lock_ufs(dir->i_sb);
3257545e	185	inode_inc_link_count(dir);
1da177e4 LT	186
	187	inode = ufs_new_inode(dir, S_IFDIR\|mode);
	188	err = PTR_ERR(inode);
	189	if (IS_ERR(inode))
	190	goto out_dir;
	191
	192	inode->i_op = &ufs_dir_inode_operations;
	193	inode->i_fop = &ufs_dir_operations;
826843a3	194	inode->i_mapping->a_ops = &ufs_aops;
1da177e4	195
3257545e	196	inode_inc_link_count(inode);
1da177e4 LT	197
	198	err = ufs_make_empty(inode, dir);
	199	if (err)
	200	goto out_fail;
	201
	202	err = ufs_add_link(dentry, inode);
	203	if (err)
	204	goto out_fail;
788257d6	205	unlock_ufs(dir->i_sb);
1da177e4 LT	206
	207	d_instantiate(dentry, inode);
	208	out:
	209	return err;
	210
	211	out_fail:
3257545e AD	212	inode_dec_link_count(inode);
3257545e AD	213	inode_dec_link_count(inode);
1da177e4 LT	214	iput (inode);
1da177e4 LT	215	out_dir:
3257545e	216	inode_dec_link_count(dir);
788257d6	217	unlock_ufs(dir->i_sb);
1da177e4 LT	218	goto out;
	219	}
	220
b71034e5	221	static int ufs_unlink(struct inode dir, struct dentry dentry)
1da177e4 LT	222	{
1da177e4 LT	223	struct inode * inode = dentry->d_inode;
b71034e5 ED	224	struct ufs_dir_entry *de;
b71034e5 ED	225	struct page *page;
1da177e4 LT	226	int err = -ENOENT;
1da177e4 LT	227
08049707	228	de = ufs_find_entry(dir, &dentry->d_name, &page);
1da177e4 LT	229	if (!de)
	230	goto out;
	231
b71034e5	232	err = ufs_delete_entry(dir, de, page);
1da177e4 LT	233	if (err)
	234	goto out;
	235
	236	inode->i_ctime = dir->i_ctime;
3257545e	237	inode_dec_link_count(inode);
1da177e4 LT	238	err = 0;
1da177e4 LT	239	out:
1da177e4 LT	240	return err;
	241	}
	242
	243	static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
	244	{
	245	struct inode * inode = dentry->d_inode;
	246	int err= -ENOTEMPTY;
	247
788257d6	248	lock_ufs(dir->i_sb);
1da177e4 LT	249	if (ufs_empty_dir (inode)) {
	250	err = ufs_unlink(dir, dentry);
	251	if (!err) {
	252	inode->i_size = 0;
3257545e AD	253	inode_dec_link_count(inode);
3257545e AD	254	inode_dec_link_count(dir);
1da177e4 LT	255	}
1da177e4 LT	256	}
788257d6	257	unlock_ufs(dir->i_sb);
1da177e4 LT	258	return err;
	259	}
	260
b71034e5 ED	261	static int ufs_rename(struct inode old_dir, struct dentry old_dentry,
b71034e5 ED	262	struct inode new_dir, struct dentry new_dentry)
1da177e4 LT	263	{
	264	struct inode *old_inode = old_dentry->d_inode;
	265	struct inode *new_inode = new_dentry->d_inode;
b71034e5 ED	266	struct page *dir_page = NULL;
	267	struct ufs_dir_entry * dir_de = NULL;
	268	struct page *old_page;
1da177e4 LT	269	struct ufs_dir_entry *old_de;
	270	int err = -ENOENT;
	271
08049707	272	old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1da177e4 LT	273	if (!old_de)
	274	goto out;
	275
	276	if (S_ISDIR(old_inode->i_mode)) {
	277	err = -EIO;
b71034e5	278	dir_de = ufs_dotdot(old_inode, &dir_page);
1da177e4 LT	279	if (!dir_de)
	280	goto out_old;
	281	}
	282
	283	if (new_inode) {
b71034e5	284	struct page *new_page;
1da177e4 LT	285	struct ufs_dir_entry *new_de;
	286
	287	err = -ENOTEMPTY;
b71034e5	288	if (dir_de && !ufs_empty_dir(new_inode))
1da177e4	289	goto out_dir;
b71034e5	290
1da177e4	291	err = -ENOENT;
08049707	292	new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1da177e4 LT	293	if (!new_de)
1da177e4 LT	294	goto out_dir;
b71034e5	295	ufs_set_link(new_dir, new_de, new_page, old_inode);
1da177e4 LT	296	new_inode->i_ctime = CURRENT_TIME_SEC;
1da177e4 LT	297	if (dir_de)
9a53c3a7	298	drop_nlink(new_inode);
3257545e	299	inode_dec_link_count(new_inode);
1da177e4	300	} else {
1da177e4	301	err = ufs_add_link(new_dentry, old_inode);
37750cdd	302	if (err)
1da177e4	303	goto out_dir;
1da177e4	304	if (dir_de)
3257545e	305	inode_inc_link_count(new_dir);
1da177e4 LT	306	}
1da177e4 LT	307
b71034e5 ED	308	/*
	309	* Like most other Unix systems, set the ctime for inodes on a
	310	* rename.
b71034e5 ED	311	*/
b71034e5 ED	312	old_inode->i_ctime = CURRENT_TIME_SEC;
1da177e4	313
b71034e5	314	ufs_delete_entry(old_dir, old_de, old_page);
37750cdd	315	mark_inode_dirty(old_inode);
1da177e4 LT	316
1da177e4 LT	317	if (dir_de) {
b71034e5	318	ufs_set_link(old_inode, dir_de, dir_page, new_dir);
3257545e	319	inode_dec_link_count(old_dir);
1da177e4	320	}
1da177e4 LT	321	return 0;
1da177e4 LT	322
b71034e5	323
1da177e4	324	out_dir:
b71034e5 ED	325	if (dir_de) {
	326	kunmap(dir_page);
	327	page_cache_release(dir_page);
	328	}
1da177e4	329	out_old:
b71034e5 ED	330	kunmap(old_page);
b71034e5 ED	331	page_cache_release(old_page);
1da177e4	332	out:
1da177e4 LT	333	return err;
	334	}
	335
c5ef1c42	336	const struct inode_operations ufs_dir_inode_operations = {
1da177e4 LT	337	.create = ufs_create,
	338	.lookup = ufs_lookup,
	339	.link = ufs_link,
	340	.unlink = ufs_unlink,
	341	.symlink = ufs_symlink,
	342	.mkdir = ufs_mkdir,
	343	.rmdir = ufs_rmdir,
	344	.mknod = ufs_mknod,
	345	.rename = ufs_rename,
	346	};