[deliverable/linux.git] / fs / affs / namei.c

/*
 *  linux/fs/affs/namei.c
 *
 *  (c) 1996  Hans-Joachim Widmaier - Rewritten
 *
 *  (C) 1993  Ray Burr - Modified for Amiga FFS filesystem.
 *
 *  (C) 1991  Linus Torvalds - minix filesystem
 */

#include "affs.h"

typedef int (*toupper_t)(int);

static int	 affs_toupper(int ch);
static int	 affs_hash_dentry(const struct dentry *, struct qstr *);
static int       affs_compare_dentry(const struct dentry *parent, const struct dentry *dentry,
		unsigned int len, const char *str, const struct qstr *name);
static int	 affs_intl_toupper(int ch);
static int	 affs_intl_hash_dentry(const struct dentry *, struct qstr *);
static int       affs_intl_compare_dentry(const struct dentry *parent, const struct dentry *dentry,
		unsigned int len, const char *str, const struct qstr *name);

const struct dentry_operations affs_dentry_operations = {
	.d_hash		= affs_hash_dentry,
	.d_compare	= affs_compare_dentry,
};

const struct dentry_operations affs_intl_dentry_operations = {
	.d_hash		= affs_intl_hash_dentry,
	.d_compare	= affs_intl_compare_dentry,
};


/* Simple toupper() for DOS\1 */

static int
affs_toupper(int ch)
{
	return ch >= 'a' && ch <= 'z' ? ch -= ('a' - 'A') : ch;
}

/* International toupper() for DOS\3 ("international") */

static int
affs_intl_toupper(int ch)
{
	return (ch >= 'a' && ch <= 'z') || (ch >= 0xE0
		&& ch <= 0xFE && ch != 0xF7) ?
		ch - ('a' - 'A') : ch;
}

static inline toupper_t
affs_get_toupper(struct super_block *sb)
{
	return AFFS_SB(sb)->s_flags & SF_INTL ? affs_intl_toupper : affs_toupper;
}

/*
 * Note: the dentry argument is the parent dentry.
 */
static inline int
__affs_hash_dentry(struct qstr *qstr, toupper_t toupper, bool notruncate)
{
	const u8 *name = qstr->name;
	unsigned long hash;
	int i;

	i = affs_check_name(qstr->name, qstr->len, notruncate);
	if (i)
		return i;

	hash = init_name_hash();
	i = min(qstr->len, 30u);
	for (; i > 0; name++, i--)
		hash = partial_name_hash(toupper(*name), hash);
	qstr->hash = end_name_hash(hash);

	return 0;
}

static int
affs_hash_dentry(const struct dentry *dentry, struct qstr *qstr)
{
	return __affs_hash_dentry(qstr, affs_toupper,
				  affs_nofilenametruncate(dentry));

}

static int
affs_intl_hash_dentry(const struct dentry *dentry, struct qstr *qstr)
{
	return __affs_hash_dentry(qstr, affs_intl_toupper,
				  affs_nofilenametruncate(dentry));

}

static inline int __affs_compare_dentry(unsigned int len,
		const char *str, const struct qstr *name, toupper_t toupper,
		bool notruncate)
{
	const u8 *aname = str;
	const u8 *bname = name->name;

	/*
	 * 'str' is the name of an already existing dentry, so the name
	 * must be valid. 'name' must be validated first.
	 */

	if (affs_check_name(name->name, name->len, notruncate))
		return 1;

	/*
	 * If the names are longer than the allowed 30 chars,
	 * the excess is ignored, so their length may differ.
	 */
	if (len >= 30) {
		if (name->len < 30)
			return 1;
		len = 30;
	} else if (len != name->len)
		return 1;

	for (; len > 0; len--)
		if (toupper(*aname++) != toupper(*bname++))
			return 1;

	return 0;
}

static int
affs_compare_dentry(const struct dentry *parent, const struct dentry *dentry,
		unsigned int len, const char *str, const struct qstr *name)
{

	return __affs_compare_dentry(len, str, name, affs_toupper,
				     affs_nofilenametruncate(parent));
}

static int
affs_intl_compare_dentry(const struct dentry *parent, const struct dentry *dentry,
		unsigned int len, const char *str, const struct qstr *name)
{
	return __affs_compare_dentry(len, str, name, affs_intl_toupper,
				     affs_nofilenametruncate(parent));

}

/*
 * NOTE! unlike strncmp, affs_match returns 1 for success, 0 for failure.
 */

static inline int
affs_match(struct dentry *dentry, const u8 *name2, toupper_t toupper)
{
	const u8 *name = dentry->d_name.name;
	int len = dentry->d_name.len;

	if (len >= 30) {
		if (*name2 < 30)
			return 0;
		len = 30;
	} else if (len != *name2)
		return 0;

	for (name2++; len > 0; len--)
		if (toupper(*name++) != toupper(*name2++))
			return 0;
	return 1;
}

int
affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len)
{
	toupper_t toupper = affs_get_toupper(sb);
	int hash;

	hash = len = min(len, 30u);
	for (; len > 0; len--)
		hash = (hash * 13 + toupper(*name++)) & 0x7ff;

	return hash % AFFS_SB(sb)->s_hashsize;
}

static struct buffer_head *
affs_find_entry(struct inode *dir, struct dentry *dentry)
{
	struct super_block *sb = dir->i_sb;
	struct buffer_head *bh;
	toupper_t toupper = affs_get_toupper(sb);
	u32 key;

	pr_debug("%s(\"%pd\")\n", __func__, dentry);

	bh = affs_bread(sb, dir->i_ino);
	if (!bh)
		return ERR_PTR(-EIO);

	key = be32_to_cpu(AFFS_HEAD(bh)->table[affs_hash_name(sb, dentry->d_name.name, dentry->d_name.len)]);

	for (;;) {
		affs_brelse(bh);
		if (key == 0)
			return NULL;
		bh = affs_bread(sb, key);
		if (!bh)
			return ERR_PTR(-EIO);
		if (affs_match(dentry, AFFS_TAIL(sb, bh)->name, toupper))
			return bh;
		key = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain);
	}
}

struct dentry *
affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
{
	struct super_block *sb = dir->i_sb;
	struct buffer_head *bh;
	struct inode *inode = NULL;

	pr_debug("%s(\"%pd\")\n", __func__, dentry);

	affs_lock_dir(dir);
	bh = affs_find_entry(dir, dentry);
	affs_unlock_dir(dir);
	if (IS_ERR(bh))
		return ERR_CAST(bh);
	if (bh) {
		u32 ino = bh->b_blocknr;

		/* store the real header ino in d_fsdata for faster lookups */
		dentry->d_fsdata = (void *)(long)ino;
		switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
		//link to dirs disabled
		//case ST_LINKDIR:
		case ST_LINKFILE:
			ino = be32_to_cpu(AFFS_TAIL(sb, bh)->original);
		}
		affs_brelse(bh);
		inode = affs_iget(sb, ino);
		if (IS_ERR(inode))
			return ERR_CAST(inode);
	}
	d_add(dentry, inode);
	return NULL;
}

int
affs_unlink(struct inode *dir, struct dentry *dentry)
{
	pr_debug("%s(dir=%d, %lu \"%pd\")\n",
		 __func__, (u32)dir->i_ino, dentry->d_inode->i_ino,
		dentry);

	return affs_remove_header(dentry);
}

int
affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl)
{
	struct super_block *sb = dir->i_sb;
	struct inode	*inode;
	int		 error;

	pr_debug("%s(%lu,\"%pd\",0%ho)\n",
		 __func__, dir->i_ino, dentry, mode);

	inode = affs_new_inode(dir);
	if (!inode)
		return -ENOSPC;

	inode->i_mode = mode;
	mode_to_prot(inode);
	mark_inode_dirty(inode);

	inode->i_op = &affs_file_inode_operations;
	inode->i_fop = &affs_file_operations;
	inode->i_mapping->a_ops = (AFFS_SB(sb)->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
	error = affs_add_entry(dir, inode, dentry, ST_FILE);
	if (error) {
		clear_nlink(inode);
		iput(inode);
		return error;
	}
	return 0;
}

int
affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
	struct inode		*inode;
	int			 error;

	pr_debug("%s(%lu,\"%pd\",0%ho)\n",
		 __func__, dir->i_ino, dentry, mode);

	inode = affs_new_inode(dir);
	if (!inode)
		return -ENOSPC;

	inode->i_mode = S_IFDIR | mode;
	mode_to_prot(inode);

	inode->i_op = &affs_dir_inode_operations;
	inode->i_fop = &affs_dir_operations;

	error = affs_add_entry(dir, inode, dentry, ST_USERDIR);
	if (error) {
		clear_nlink(inode);
		mark_inode_dirty(inode);
		iput(inode);
		return error;
	}
	return 0;
}

int
affs_rmdir(struct inode *dir, struct dentry *dentry)
{
	pr_debug("%s(dir=%u, %lu \"%pd\")\n",
		__func__, (u32)dir->i_ino, dentry->d_inode->i_ino,
		 dentry);

	return affs_remove_header(dentry);
}

int
affs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
{
	struct super_block	*sb = dir->i_sb;
	struct buffer_head	*bh;
	struct inode		*inode;
	char			*p;
	int			 i, maxlen, error;
	char			 c, lc;

	pr_debug("%s(%lu,\"%pd\" -> \"%s\")\n",
		 __func__, dir->i_ino, dentry, symname);

	maxlen = AFFS_SB(sb)->s_hashsize * sizeof(u32) - 1;
	inode  = affs_new_inode(dir);
	if (!inode)
		return -ENOSPC;

	inode->i_op = &affs_symlink_inode_operations;
	inode->i_data.a_ops = &affs_symlink_aops;
	inode->i_mode = S_IFLNK | 0777;
	mode_to_prot(inode);

	error = -EIO;
	bh = affs_bread(sb, inode->i_ino);
	if (!bh)
		goto err;
	i  = 0;
	p  = (char *)AFFS_HEAD(bh)->table;
	lc = '/';
	if (*symname == '/') {
		struct affs_sb_info *sbi = AFFS_SB(sb);
		while (*symname == '/')
			symname++;
		spin_lock(&sbi->symlink_lock);
		while (sbi->s_volume[i])	/* Cannot overflow */
			*p++ = sbi->s_volume[i++];
		spin_unlock(&sbi->symlink_lock);
	}
	while (i < maxlen && (c = *symname++)) {
		if (c == '.' && lc == '/' && *symname == '.' && symname[1] == '/') {
			*p++ = '/';
			i++;
			symname += 2;
			lc = '/';
		} else if (c == '.' && lc == '/' && *symname == '/') {
			symname++;
			lc = '/';
		} else {
			*p++ = c;
			lc   = c;
			i++;
		}
		if (lc == '/')
			while (*symname == '/')
				symname++;
	}
	*p = 0;
	mark_buffer_dirty_inode(bh, inode);
	affs_brelse(bh);
	mark_inode_dirty(inode);

	error = affs_add_entry(dir, inode, dentry, ST_SOFTLINK);
	if (error)
		goto err;

	return 0;

err:
	clear_nlink(inode);
	mark_inode_dirty(inode);
	iput(inode);
	return error;
}

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

	pr_debug("%s(%u, %u, \"%pd\")\n",
		 __func__, (u32)inode->i_ino, (u32)dir->i_ino,
		 dentry);

	return affs_add_entry(dir, inode, dentry, ST_LINKFILE);
}

int
affs_rename(struct inode *old_dir, struct dentry *old_dentry,
	    struct inode *new_dir, struct dentry *new_dentry)
{
	struct super_block *sb = old_dir->i_sb;
	struct buffer_head *bh = NULL;
	int retval;

	pr_debug("%s(old=%u,\"%pd\" to new=%u,\"%pd\")\n",
		 __func__, (u32)old_dir->i_ino, old_dentry,
		 (u32)new_dir->i_ino, new_dentry);

	retval = affs_check_name(new_dentry->d_name.name,
				 new_dentry->d_name.len,
				 affs_nofilenametruncate(old_dentry));

	if (retval)
		return retval;

	/* Unlink destination if it already exists */
	if (new_dentry->d_inode) {
		retval = affs_remove_header(new_dentry);
		if (retval)
			return retval;
	}

	bh = affs_bread(sb, old_dentry->d_inode->i_ino);
	if (!bh)
		return -EIO;

	/* Remove header from its parent directory. */
	affs_lock_dir(old_dir);
	retval = affs_remove_hash(old_dir, bh);
	affs_unlock_dir(old_dir);
	if (retval)
		goto done;

	/* And insert it into the new directory with the new name. */
	affs_copy_name(AFFS_TAIL(sb, bh)->name, new_dentry);
	affs_fix_checksum(sb, bh);
	affs_lock_dir(new_dir);
	retval = affs_insert_hash(new_dir, bh);
	affs_unlock_dir(new_dir);
	/* TODO: move it back to old_dir, if error? */

done:
	mark_buffer_dirty_inode(bh, retval ? old_dir : new_dir);
	affs_brelse(bh);
	return retval;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/affs/namei.c
	3	*
	4	* (c) 1996 Hans-Joachim Widmaier - Rewritten
	5	*
	6	* (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
	7	*
	8	* (C) 1991 Linus Torvalds - minix filesystem
	9	*/
	10
	11	#include "affs.h"
	12
	13	typedef int (*toupper_t)(int);
	14
	15	static int affs_toupper(int ch);
da53be12 LT	16	static int affs_hash_dentry(const struct dentry , struct qstr );
da53be12 LT	17	static int affs_compare_dentry(const struct dentry parent, const struct dentry dentry,
621e155a	18	unsigned int len, const char str, const struct qstr name);
1da177e4	19	static int affs_intl_toupper(int ch);
da53be12 LT	20	static int affs_intl_hash_dentry(const struct dentry , struct qstr );
da53be12 LT	21	static int affs_intl_compare_dentry(const struct dentry parent, const struct dentry dentry,
621e155a	22	unsigned int len, const char str, const struct qstr name);
1da177e4	23
e16404ed	24	const struct dentry_operations affs_dentry_operations = {
1da177e4 LT	25	.d_hash = affs_hash_dentry,
	26	.d_compare = affs_compare_dentry,
	27	};
	28
a129880d	29	const struct dentry_operations affs_intl_dentry_operations = {
1da177e4 LT	30	.d_hash = affs_intl_hash_dentry,
	31	.d_compare = affs_intl_compare_dentry,
	32	};
	33
	34
	35	/* Simple toupper() for DOS\1 */
	36
	37	static int
	38	affs_toupper(int ch)
	39	{
	40	return ch >= 'a' && ch <= 'z' ? ch -= ('a' - 'A') : ch;
	41	}
	42
	43	/* International toupper() for DOS\3 ("international") */
	44
	45	static int
	46	affs_intl_toupper(int ch)
	47	{
	48	return (ch >= 'a' && ch <= 'z') \|\| (ch >= 0xE0
	49	&& ch <= 0xFE && ch != 0xF7) ?
	50	ch - ('a' - 'A') : ch;
	51	}
	52
	53	static inline toupper_t
	54	affs_get_toupper(struct super_block *sb)
	55	{
	56	return AFFS_SB(sb)->s_flags & SF_INTL ? affs_intl_toupper : affs_toupper;
	57	}
	58
	59	/*
	60	* Note: the dentry argument is the parent dentry.
	61	*/
	62	static inline int
8ca57722	63	__affs_hash_dentry(struct qstr *qstr, toupper_t toupper, bool notruncate)
1da177e4 LT	64	{
	65	const u8 *name = qstr->name;
	66	unsigned long hash;
	67	int i;
	68
8ca57722	69	i = affs_check_name(qstr->name, qstr->len, notruncate);
1da177e4 LT	70	if (i)
	71	return i;
	72
	73	hash = init_name_hash();
	74	i = min(qstr->len, 30u);
	75	for (; i > 0; name++, i--)
	76	hash = partial_name_hash(toupper(*name), hash);
	77	qstr->hash = end_name_hash(hash);
	78
	79	return 0;
	80	}
	81
	82	static int
da53be12	83	affs_hash_dentry(const struct dentry dentry, struct qstr qstr)
1da177e4	84	{
8ca57722 FF	85	return __affs_hash_dentry(qstr, affs_toupper,
	86	affs_nofilenametruncate(dentry));
	87
1da177e4	88	}
8ca57722	89
1da177e4	90	static int
da53be12	91	affs_intl_hash_dentry(const struct dentry dentry, struct qstr qstr)
1da177e4	92	{
8ca57722 FF	93	return __affs_hash_dentry(qstr, affs_intl_toupper,
	94	affs_nofilenametruncate(dentry));
	95
1da177e4 LT	96	}
1da177e4 LT	97
621e155a	98	static inline int __affs_compare_dentry(unsigned int len,
8ca57722 FF	99	const char str, const struct qstr name, toupper_t toupper,
8ca57722 FF	100	bool notruncate)
1da177e4	101	{
621e155a NP	102	const u8 *aname = str;
621e155a NP	103	const u8 *bname = name->name;
1da177e4	104
621e155a NP	105	/*
	106	* 'str' is the name of an already existing dentry, so the name
	107	* must be valid. 'name' must be validated first.
1da177e4 LT	108	*/
1da177e4 LT	109
8ca57722	110	if (affs_check_name(name->name, name->len, notruncate))
1da177e4 LT	111	return 1;
1da177e4 LT	112
621e155a NP	113	/*
621e155a NP	114	* If the names are longer than the allowed 30 chars,
1da177e4 LT	115	* the excess is ignored, so their length may differ.
1da177e4 LT	116	*/
1da177e4	117	if (len >= 30) {
621e155a	118	if (name->len < 30)
1da177e4 LT	119	return 1;
1da177e4 LT	120	len = 30;
621e155a	121	} else if (len != name->len)
1da177e4 LT	122	return 1;
	123
	124	for (; len > 0; len--)
	125	if (toupper(aname++) != toupper(bname++))
	126	return 1;
	127
	128	return 0;
	129	}
	130
	131	static int
da53be12	132	affs_compare_dentry(const struct dentry parent, const struct dentry dentry,
621e155a	133	unsigned int len, const char str, const struct qstr name)
1da177e4	134	{
8ca57722 FF	135
	136	return __affs_compare_dentry(len, str, name, affs_toupper,
	137	affs_nofilenametruncate(parent));
1da177e4	138	}
8ca57722	139
1da177e4	140	static int
da53be12	141	affs_intl_compare_dentry(const struct dentry parent, const struct dentry dentry,
621e155a	142	unsigned int len, const char str, const struct qstr name)
1da177e4	143	{
8ca57722 FF	144	return __affs_compare_dentry(len, str, name, affs_intl_toupper,
	145	affs_nofilenametruncate(parent));
	146
1da177e4 LT	147	}
	148
	149	/*
	150	* NOTE! unlike strncmp, affs_match returns 1 for success, 0 for failure.
	151	*/
	152
	153	static inline int
	154	affs_match(struct dentry dentry, const u8 name2, toupper_t toupper)
	155	{
	156	const u8 *name = dentry->d_name.name;
	157	int len = dentry->d_name.len;
	158
	159	if (len >= 30) {
	160	if (*name2 < 30)
	161	return 0;
	162	len = 30;
	163	} else if (len != *name2)
	164	return 0;
	165
	166	for (name2++; len > 0; len--)
	167	if (toupper(name++) != toupper(name2++))
	168	return 0;
	169	return 1;
	170	}
	171
	172	int
	173	affs_hash_name(struct super_block sb, const u8 name, unsigned int len)
	174	{
	175	toupper_t toupper = affs_get_toupper(sb);
	176	int hash;
	177
	178	hash = len = min(len, 30u);
	179	for (; len > 0; len--)
	180	hash = (hash * 13 + toupper(*name++)) & 0x7ff;
	181
	182	return hash % AFFS_SB(sb)->s_hashsize;
	183	}
	184
	185	static struct buffer_head *
	186	affs_find_entry(struct inode dir, struct dentry dentry)
	187	{
	188	struct super_block *sb = dir->i_sb;
	189	struct buffer_head *bh;
	190	toupper_t toupper = affs_get_toupper(sb);
	191	u32 key;
	192
a455589f	193	pr_debug("%s(\"%pd\")\n", __func__, dentry);
1da177e4 LT	194
	195	bh = affs_bread(sb, dir->i_ino);
	196	if (!bh)
	197	return ERR_PTR(-EIO);
	198
	199	key = be32_to_cpu(AFFS_HEAD(bh)->table[affs_hash_name(sb, dentry->d_name.name, dentry->d_name.len)]);
	200
	201	for (;;) {
	202	affs_brelse(bh);
	203	if (key == 0)
	204	return NULL;
	205	bh = affs_bread(sb, key);
	206	if (!bh)
	207	return ERR_PTR(-EIO);
	208	if (affs_match(dentry, AFFS_TAIL(sb, bh)->name, toupper))
	209	return bh;
	210	key = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain);
	211	}
	212	}
	213
	214	struct dentry *
00cd8dd3	215	affs_lookup(struct inode dir, struct dentry dentry, unsigned int flags)
1da177e4 LT	216	{
	217	struct super_block *sb = dir->i_sb;
	218	struct buffer_head *bh;
	219	struct inode *inode = NULL;
	220
a455589f	221	pr_debug("%s(\"%pd\")\n", __func__, dentry);
1da177e4 LT	222
	223	affs_lock_dir(dir);
	224	bh = affs_find_entry(dir, dentry);
	225	affs_unlock_dir(dir);
210f8559	226	if (IS_ERR(bh))
e231c2ee	227	return ERR_CAST(bh);
1da177e4 LT	228	if (bh) {
	229	u32 ino = bh->b_blocknr;
	230
	231	/* store the real header ino in d_fsdata for faster lookups */
	232	dentry->d_fsdata = (void *)(long)ino;
	233	switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
	234	//link to dirs disabled
	235	//case ST_LINKDIR:
	236	case ST_LINKFILE:
	237	ino = be32_to_cpu(AFFS_TAIL(sb, bh)->original);
	238	}
	239	affs_brelse(bh);
210f8559 DH	240	inode = affs_iget(sb, ino);
210f8559 DH	241	if (IS_ERR(inode))
cccad8f9	242	return ERR_CAST(inode);
1da177e4	243	}
1da177e4 LT	244	d_add(dentry, inode);
	245	return NULL;
	246	}
	247
	248	int
	249	affs_unlink(struct inode dir, struct dentry dentry)
	250	{
a455589f	251	pr_debug("%s(dir=%d, %lu \"%pd\")\n",
9606d9aa	252	__func__, (u32)dir->i_ino, dentry->d_inode->i_ino,
a455589f	253	dentry);
1da177e4 LT	254
	255	return affs_remove_header(dentry);
	256	}
	257
	258	int
ebfc3b49	259	affs_create(struct inode dir, struct dentry dentry, umode_t mode, bool excl)
1da177e4 LT	260	{
	261	struct super_block *sb = dir->i_sb;
	262	struct inode *inode;
	263	int error;
	264
a455589f AV	265	pr_debug("%s(%lu,\"%pd\",0%ho)\n",
a455589f AV	266	__func__, dir->i_ino, dentry, mode);
1da177e4 LT	267
	268	inode = affs_new_inode(dir);
	269	if (!inode)
	270	return -ENOSPC;
	271
	272	inode->i_mode = mode;
	273	mode_to_prot(inode);
	274	mark_inode_dirty(inode);
	275
	276	inode->i_op = &affs_file_inode_operations;
	277	inode->i_fop = &affs_file_operations;
	278	inode->i_mapping->a_ops = (AFFS_SB(sb)->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
	279	error = affs_add_entry(dir, inode, dentry, ST_FILE);
	280	if (error) {
6d6b77f1	281	clear_nlink(inode);
1da177e4 LT	282	iput(inode);
	283	return error;
	284	}
	285	return 0;
	286	}
	287
	288	int
18bb1db3	289	affs_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
1da177e4 LT	290	{
	291	struct inode *inode;
	292	int error;
	293
a455589f AV	294	pr_debug("%s(%lu,\"%pd\",0%ho)\n",
a455589f AV	295	__func__, dir->i_ino, dentry, mode);
1da177e4 LT	296
	297	inode = affs_new_inode(dir);
	298	if (!inode)
	299	return -ENOSPC;
	300
	301	inode->i_mode = S_IFDIR \| mode;
	302	mode_to_prot(inode);
	303
	304	inode->i_op = &affs_dir_inode_operations;
	305	inode->i_fop = &affs_dir_operations;
	306
	307	error = affs_add_entry(dir, inode, dentry, ST_USERDIR);
	308	if (error) {
6d6b77f1	309	clear_nlink(inode);
1da177e4 LT	310	mark_inode_dirty(inode);
	311	iput(inode);
	312	return error;
	313	}
	314	return 0;
	315	}
	316
	317	int
	318	affs_rmdir(struct inode dir, struct dentry dentry)
	319	{
a455589f	320	pr_debug("%s(dir=%u, %lu \"%pd\")\n",
9606d9aa	321	__func__, (u32)dir->i_ino, dentry->d_inode->i_ino,
a455589f	322	dentry);
1da177e4 LT	323
	324	return affs_remove_header(dentry);
	325	}
	326
	327	int
	328	affs_symlink(struct inode dir, struct dentry dentry, const char *symname)
	329	{
	330	struct super_block *sb = dir->i_sb;
	331	struct buffer_head *bh;
	332	struct inode *inode;
	333	char *p;
	334	int i, maxlen, error;
	335	char c, lc;
	336
a455589f AV	337	pr_debug("%s(%lu,\"%pd\" -> \"%s\")\n",
a455589f AV	338	__func__, dir->i_ino, dentry, symname);
1da177e4 LT	339
	340	maxlen = AFFS_SB(sb)->s_hashsize * sizeof(u32) - 1;
	341	inode = affs_new_inode(dir);
	342	if (!inode)
	343	return -ENOSPC;
	344
	345	inode->i_op = &affs_symlink_inode_operations;
	346	inode->i_data.a_ops = &affs_symlink_aops;
	347	inode->i_mode = S_IFLNK \| 0777;
	348	mode_to_prot(inode);
	349
	350	error = -EIO;
	351	bh = affs_bread(sb, inode->i_ino);
	352	if (!bh)
	353	goto err;
	354	i = 0;
	355	p = (char *)AFFS_HEAD(bh)->table;
	356	lc = '/';
	357	if (*symname == '/') {
29333920	358	struct affs_sb_info *sbi = AFFS_SB(sb);
1da177e4 LT	359	while (*symname == '/')
1da177e4 LT	360	symname++;
29333920 AV	361	spin_lock(&sbi->symlink_lock);
	362	while (sbi->s_volume[i]) /* Cannot overflow */
	363	*p++ = sbi->s_volume[i++];
	364	spin_unlock(&sbi->symlink_lock);
1da177e4 LT	365	}
	366	while (i < maxlen && (c = *symname++)) {
	367	if (c == '.' && lc == '/' && *symname == '.' && symname[1] == '/') {
	368	*p++ = '/';
	369	i++;
	370	symname += 2;
	371	lc = '/';
	372	} else if (c == '.' && lc == '/' && *symname == '/') {
	373	symname++;
	374	lc = '/';
	375	} else {
	376	*p++ = c;
	377	lc = c;
	378	i++;
	379	}
	380	if (lc == '/')
	381	while (*symname == '/')
	382	symname++;
	383	}
	384	*p = 0;
	385	mark_buffer_dirty_inode(bh, inode);
	386	affs_brelse(bh);
	387	mark_inode_dirty(inode);
	388
	389	error = affs_add_entry(dir, inode, dentry, ST_SOFTLINK);
	390	if (error)
	391	goto err;
	392
	393	return 0;
	394
	395	err:
6d6b77f1	396	clear_nlink(inode);
1da177e4 LT	397	mark_inode_dirty(inode);
	398	iput(inode);
	399	return error;
	400	}
	401
	402	int
	403	affs_link(struct dentry old_dentry, struct inode dir, struct dentry *dentry)
	404	{
	405	struct inode *inode = old_dentry->d_inode;
	406
a455589f	407	pr_debug("%s(%u, %u, \"%pd\")\n",
9606d9aa	408	__func__, (u32)inode->i_ino, (u32)dir->i_ino,
a455589f	409	dentry);
1da177e4 LT	410
	411	return affs_add_entry(dir, inode, dentry, ST_LINKFILE);
	412	}
	413
	414	int
	415	affs_rename(struct inode old_dir, struct dentry old_dentry,
	416	struct inode new_dir, struct dentry new_dentry)
	417	{
	418	struct super_block *sb = old_dir->i_sb;
	419	struct buffer_head *bh = NULL;
	420	int retval;
	421
a455589f AV	422	pr_debug("%s(old=%u,\"%pd\" to new=%u,\"%pd\")\n",
	423	__func__, (u32)old_dir->i_ino, old_dentry,
	424	(u32)new_dir->i_ino, new_dentry);
1da177e4	425
8ca57722 FF	426	retval = affs_check_name(new_dentry->d_name.name,
	427	new_dentry->d_name.len,
	428	affs_nofilenametruncate(old_dentry));
	429
1da177e4 LT	430	if (retval)
	431	return retval;
	432
	433	/* Unlink destination if it already exists */
	434	if (new_dentry->d_inode) {
	435	retval = affs_remove_header(new_dentry);
	436	if (retval)
	437	return retval;
	438	}
	439
1da177e4 LT	440	bh = affs_bread(sb, old_dentry->d_inode->i_ino);
1da177e4 LT	441	if (!bh)
3ac81413	442	return -EIO;
1da177e4 LT	443
	444	/* Remove header from its parent directory. */
	445	affs_lock_dir(old_dir);
	446	retval = affs_remove_hash(old_dir, bh);
	447	affs_unlock_dir(old_dir);
	448	if (retval)
	449	goto done;
	450
	451	/* And insert it into the new directory with the new name. */
	452	affs_copy_name(AFFS_TAIL(sb, bh)->name, new_dentry);
	453	affs_fix_checksum(sb, bh);
	454	affs_lock_dir(new_dir);
	455	retval = affs_insert_hash(new_dir, bh);
	456	affs_unlock_dir(new_dir);
	457	/* TODO: move it back to old_dir, if error? */
	458
	459	done:
	460	mark_buffer_dirty_inode(bh, retval ? old_dir : new_dir);
	461	affs_brelse(bh);
	462	return retval;
	463	}