[deliverable/linux.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 <linux/ufs_fs.h>
#include <linux/smp_lock.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, 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 = ufs_iget(dir->i_sb, ino);
		if (IS_ERR(inode)) {
			unlock_kernel();
			return ERR_CAST(inode);
		}
	}
	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;
	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_kernel();
		err = ufs_add_nondir(dentry, inode);
		unlock_kernel();
	}
	UFSD("END: err=%d\n", err);
	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);
		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_notlocked;

	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();
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_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->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_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 ufs_dir_entry *de;
	struct page *page;
	int err = -ENOENT;

	de = ufs_find_entry(dir, dentry, &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_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 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, &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, &new_page);
		if (!new_de)
			goto out_dir;
		inode_inc_link_count(old_inode);
		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 {
		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);
	}

	/*
	 * Like most other Unix systems, set the ctime for inodes on a
 	 * rename.
	 * inode_dec_link_count() will mark the inode dirty.
	 */
	old_inode->i_ctime = CURRENT_TIME_SEC;

	ufs_delete_entry(old_dir, old_de, old_page);
	inode_dec_link_count(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 <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>
	32	#include <linux/ufs_fs.h>
	33	#include <linux/smp_lock.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
	49	static struct dentry ufs_lookup(struct inode dir, struct dentry dentry, struct nameidata nd)
	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
	57	lock_kernel();
	58	ino = ufs_inode_by_name(dir, dentry);
	59	if (ino) {
b55c460d DH	60	inode = ufs_iget(dir->i_sb, ino);
b55c460d DH	61	if (IS_ERR(inode)) {
1da177e4	62	unlock_kernel();
b55c460d	63	return ERR_CAST(inode);
1da177e4 LT	64	}
	65	}
	66	unlock_kernel();
	67	d_add(dentry, inode);
	68	return NULL;
	69	}
	70
	71	/*
	72	* By the time this is called, we already have created
	73	* the directory cache entry for the new file, but it
	74	* is so far negative - it has no inode.
	75	*
	76	* If the create succeeds, we fill in the inode information
	77	* with d_instantiate().
	78	*/
	79	static int ufs_create (struct inode * dir, struct dentry * dentry, int mode,
	80	struct nameidata *nd)
	81	{
abf5d15f ED	82	struct inode *inode;
	83	int err;
	84
	85	UFSD("BEGIN\n");
	86	inode = ufs_new_inode(dir, mode);
	87	err = PTR_ERR(inode);
	88
1da177e4 LT	89	if (!IS_ERR(inode)) {
	90	inode->i_op = &ufs_file_inode_operations;
	91	inode->i_fop = &ufs_file_operations;
	92	inode->i_mapping->a_ops = &ufs_aops;
	93	mark_inode_dirty(inode);
	94	lock_kernel();
	95	err = ufs_add_nondir(dentry, inode);
	96	unlock_kernel();
	97	}
abf5d15f	98	UFSD("END: err=%d\n", err);
1da177e4 LT	99	return err;
	100	}
	101
	102	static int ufs_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
	103	{
	104	struct inode *inode;
	105	int err;
	106
	107	if (!old_valid_dev(rdev))
	108	return -EINVAL;
	109	inode = ufs_new_inode(dir, mode);
	110	err = PTR_ERR(inode);
	111	if (!IS_ERR(inode)) {
	112	init_special_inode(inode, mode, rdev);
1da177e4 LT	113	ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
	114	mark_inode_dirty(inode);
	115	lock_kernel();
	116	err = ufs_add_nondir(dentry, inode);
	117	unlock_kernel();
	118	}
	119	return err;
	120	}
	121
	122	static int ufs_symlink (struct inode * dir, struct dentry * dentry,
	123	const char * symname)
	124	{
	125	struct super_block * sb = dir->i_sb;
	126	int err = -ENAMETOOLONG;
	127	unsigned l = strlen(symname)+1;
	128	struct inode * inode;
	129
	130	if (l > sb->s_blocksize)
344fe786	131	goto out_notlocked;
1da177e4 LT	132
	133	lock_kernel();
	134	inode = ufs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	135	err = PTR_ERR(inode);
	136	if (IS_ERR(inode))
	137	goto out;
	138
	139	if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
	140	/* slow symlink */
	141	inode->i_op = &page_symlink_inode_operations;
	142	inode->i_mapping->a_ops = &ufs_aops;
	143	err = page_symlink(inode, symname, l);
	144	if (err)
	145	goto out_fail;
	146	} else {
	147	/* fast symlink */
	148	inode->i_op = &ufs_fast_symlink_inode_operations;
	149	memcpy((char*)&UFS_I(inode)->i_u1.i_data,symname,l);
	150	inode->i_size = l-1;
	151	}
	152	mark_inode_dirty(inode);
	153
	154	err = ufs_add_nondir(dentry, inode);
	155	out:
	156	unlock_kernel();
344fe786	157	out_notlocked:
1da177e4 LT	158	return err;
	159
	160	out_fail:
3257545e	161	inode_dec_link_count(inode);
1da177e4 LT	162	iput(inode);
	163	goto out;
	164	}
	165
	166	static int ufs_link (struct dentry * old_dentry, struct inode * dir,
	167	struct dentry *dentry)
	168	{
	169	struct inode *inode = old_dentry->d_inode;
	170	int error;
	171
	172	lock_kernel();
	173	if (inode->i_nlink >= UFS_LINK_MAX) {
	174	unlock_kernel();
	175	return -EMLINK;
	176	}
	177
	178	inode->i_ctime = CURRENT_TIME_SEC;
3257545e	179	inode_inc_link_count(inode);
1da177e4 LT	180	atomic_inc(&inode->i_count);
	181
	182	error = ufs_add_nondir(dentry, inode);
	183	unlock_kernel();
	184	return error;
	185	}
	186
	187	static int ufs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
	188	{
	189	struct inode * inode;
	190	int err = -EMLINK;
	191
	192	if (dir->i_nlink >= UFS_LINK_MAX)
	193	goto out;
	194
	195	lock_kernel();
3257545e	196	inode_inc_link_count(dir);
1da177e4 LT	197
	198	inode = ufs_new_inode(dir, S_IFDIR\|mode);
	199	err = PTR_ERR(inode);
	200	if (IS_ERR(inode))
	201	goto out_dir;
	202
	203	inode->i_op = &ufs_dir_inode_operations;
	204	inode->i_fop = &ufs_dir_operations;
826843a3	205	inode->i_mapping->a_ops = &ufs_aops;
1da177e4	206
3257545e	207	inode_inc_link_count(inode);
1da177e4 LT	208
	209	err = ufs_make_empty(inode, dir);
	210	if (err)
	211	goto out_fail;
	212
	213	err = ufs_add_link(dentry, inode);
	214	if (err)
	215	goto out_fail;
	216	unlock_kernel();
	217
	218	d_instantiate(dentry, inode);
	219	out:
	220	return err;
	221
	222	out_fail:
3257545e AD	223	inode_dec_link_count(inode);
3257545e AD	224	inode_dec_link_count(inode);
1da177e4 LT	225	iput (inode);
1da177e4 LT	226	out_dir:
3257545e	227	inode_dec_link_count(dir);
1da177e4 LT	228	unlock_kernel();
	229	goto out;
	230	}
	231
b71034e5	232	static int ufs_unlink(struct inode dir, struct dentry dentry)
1da177e4 LT	233	{
1da177e4 LT	234	struct inode * inode = dentry->d_inode;
b71034e5 ED	235	struct ufs_dir_entry *de;
b71034e5 ED	236	struct page *page;
1da177e4 LT	237	int err = -ENOENT;
1da177e4 LT	238
b71034e5	239	de = ufs_find_entry(dir, dentry, &page);
1da177e4 LT	240	if (!de)
	241	goto out;
	242
b71034e5	243	err = ufs_delete_entry(dir, de, page);
1da177e4 LT	244	if (err)
	245	goto out;
	246
	247	inode->i_ctime = dir->i_ctime;
3257545e	248	inode_dec_link_count(inode);
1da177e4 LT	249	err = 0;
1da177e4 LT	250	out:
1da177e4 LT	251	return err;
	252	}
	253
	254	static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
	255	{
	256	struct inode * inode = dentry->d_inode;
	257	int err= -ENOTEMPTY;
	258
	259	lock_kernel();
	260	if (ufs_empty_dir (inode)) {
	261	err = ufs_unlink(dir, dentry);
	262	if (!err) {
	263	inode->i_size = 0;
3257545e AD	264	inode_dec_link_count(inode);
3257545e AD	265	inode_dec_link_count(dir);
1da177e4 LT	266	}
	267	}
	268	unlock_kernel();
	269	return err;
	270	}
	271
b71034e5 ED	272	static int ufs_rename(struct inode old_dir, struct dentry old_dentry,
b71034e5 ED	273	struct inode new_dir, struct dentry new_dentry)
1da177e4 LT	274	{
	275	struct inode *old_inode = old_dentry->d_inode;
	276	struct inode *new_inode = new_dentry->d_inode;
b71034e5 ED	277	struct page *dir_page = NULL;
	278	struct ufs_dir_entry * dir_de = NULL;
	279	struct page *old_page;
1da177e4 LT	280	struct ufs_dir_entry *old_de;
	281	int err = -ENOENT;
	282
b71034e5	283	old_de = ufs_find_entry(old_dir, old_dentry, &old_page);
1da177e4 LT	284	if (!old_de)
	285	goto out;
	286
	287	if (S_ISDIR(old_inode->i_mode)) {
	288	err = -EIO;
b71034e5	289	dir_de = ufs_dotdot(old_inode, &dir_page);
1da177e4 LT	290	if (!dir_de)
	291	goto out_old;
	292	}
	293
	294	if (new_inode) {
b71034e5	295	struct page *new_page;
1da177e4 LT	296	struct ufs_dir_entry *new_de;
	297
	298	err = -ENOTEMPTY;
b71034e5	299	if (dir_de && !ufs_empty_dir(new_inode))
1da177e4	300	goto out_dir;
b71034e5	301
1da177e4	302	err = -ENOENT;
b71034e5	303	new_de = ufs_find_entry(new_dir, new_dentry, &new_page);
1da177e4 LT	304	if (!new_de)
1da177e4 LT	305	goto out_dir;
3257545e	306	inode_inc_link_count(old_inode);
b71034e5	307	ufs_set_link(new_dir, new_de, new_page, old_inode);
1da177e4 LT	308	new_inode->i_ctime = CURRENT_TIME_SEC;
1da177e4 LT	309	if (dir_de)
9a53c3a7	310	drop_nlink(new_inode);
3257545e	311	inode_dec_link_count(new_inode);
1da177e4 LT	312	} else {
	313	if (dir_de) {
	314	err = -EMLINK;
	315	if (new_dir->i_nlink >= UFS_LINK_MAX)
	316	goto out_dir;
	317	}
3257545e	318	inode_inc_link_count(old_inode);
1da177e4 LT	319	err = ufs_add_link(new_dentry, old_inode);
1da177e4 LT	320	if (err) {
3257545e	321	inode_dec_link_count(old_inode);
1da177e4 LT	322	goto out_dir;
	323	}
	324	if (dir_de)
3257545e	325	inode_inc_link_count(new_dir);
1da177e4 LT	326	}
1da177e4 LT	327
b71034e5 ED	328	/*
	329	* Like most other Unix systems, set the ctime for inodes on a
	330	* rename.
	331	* inode_dec_link_count() will mark the inode dirty.
	332	*/
	333	old_inode->i_ctime = CURRENT_TIME_SEC;
1da177e4	334
b71034e5	335	ufs_delete_entry(old_dir, old_de, old_page);
3257545e	336	inode_dec_link_count(old_inode);
1da177e4 LT	337
1da177e4 LT	338	if (dir_de) {
b71034e5	339	ufs_set_link(old_inode, dir_de, dir_page, new_dir);
3257545e	340	inode_dec_link_count(old_dir);
1da177e4	341	}
1da177e4 LT	342	return 0;
1da177e4 LT	343
b71034e5	344
1da177e4	345	out_dir:
b71034e5 ED	346	if (dir_de) {
	347	kunmap(dir_page);
	348	page_cache_release(dir_page);
	349	}
1da177e4	350	out_old:
b71034e5 ED	351	kunmap(old_page);
b71034e5 ED	352	page_cache_release(old_page);
1da177e4	353	out:
1da177e4 LT	354	return err;
	355	}
	356
c5ef1c42	357	const struct inode_operations ufs_dir_inode_operations = {
1da177e4 LT	358	.create = ufs_create,
	359	.lookup = ufs_lookup,
	360	.link = ufs_link,
	361	.unlink = ufs_unlink,
	362	.symlink = ufs_symlink,
	363	.mkdir = ufs_mkdir,
	364	.rmdir = ufs_rmdir,
	365	.mknod = ufs_mknod,
	366	.rename = ufs_rename,
	367	};