[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(struct dentry *, struct qstr *);
static int       affs_compare_dentry(struct dentry *, struct qstr *, struct qstr *);
static int	 affs_intl_toupper(int ch);
static int	 affs_intl_hash_dentry(struct dentry *, struct qstr *);
static int       affs_intl_compare_dentry(struct dentry *, struct qstr *, struct qstr *);

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

static 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 dentry *dentry, struct qstr *qstr, toupper_t toupper)
{
	const u8 *name = qstr->name;
	unsigned long hash;
	int i;

	i = affs_check_name(qstr->name,qstr->len);
	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(struct dentry *dentry, struct qstr *qstr)
{
	return __affs_hash_dentry(dentry, qstr, affs_toupper);
}
static int
affs_intl_hash_dentry(struct dentry *dentry, struct qstr *qstr)
{
	return __affs_hash_dentry(dentry, qstr, affs_intl_toupper);
}

static inline int
__affs_compare_dentry(struct dentry *dentry, struct qstr *a, struct qstr *b, toupper_t toupper)
{
	const u8 *aname = a->name;
	const u8 *bname = b->name;
	int len;

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

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

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

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

	return 0;
}

static int
affs_compare_dentry(struct dentry *dentry, struct qstr *a, struct qstr *b)
{
	return __affs_compare_dentry(dentry, a, b, affs_toupper);
}
static int
affs_intl_compare_dentry(struct dentry *dentry, struct qstr *a, struct qstr *b)
{
	return __affs_compare_dentry(dentry, a, b, affs_intl_toupper);
}

/*
 * 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("AFFS: find_entry(\"%.*s\")\n", (int)dentry->d_name.len, dentry->d_name.name);

	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, struct nameidata *nd)
{
	struct super_block *sb = dir->i_sb;
	struct buffer_head *bh;
	struct inode *inode = NULL;

	pr_debug("AFFS: lookup(\"%.*s\")\n",(int)dentry->d_name.len,dentry->d_name.name);

	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);
	}
	dentry->d_op = AFFS_SB(sb)->s_flags & SF_INTL ? &affs_intl_dentry_operations : &affs_dentry_operations;
	d_add(dentry, inode);
	return NULL;
}

int
affs_unlink(struct inode *dir, struct dentry *dentry)
{
	pr_debug("AFFS: unlink(dir=%d, %lu \"%.*s\")\n", (u32)dir->i_ino,
		 dentry->d_inode->i_ino,
		 (int)dentry->d_name.len, dentry->d_name.name);

	return affs_remove_header(dentry);
}

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

	pr_debug("AFFS: create(%lu,\"%.*s\",0%o)\n",dir->i_ino,(int)dentry->d_name.len,
		 dentry->d_name.name,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) {
		inode->i_nlink = 0;
		iput(inode);
		return error;
	}
	return 0;
}

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

	pr_debug("AFFS: mkdir(%lu,\"%.*s\",0%o)\n",dir->i_ino,
		 (int)dentry->d_name.len,dentry->d_name.name,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) {
		inode->i_nlink = 0;
		mark_inode_dirty(inode);
		iput(inode);
		return error;
	}
	return 0;
}

int
affs_rmdir(struct inode *dir, struct dentry *dentry)
{
	pr_debug("AFFS: rmdir(dir=%u, %lu \"%.*s\")\n", (u32)dir->i_ino,
		 dentry->d_inode->i_ino,
		 (int)dentry->d_name.len, dentry->d_name.name);

	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("AFFS: symlink(%lu,\"%.*s\" -> \"%s\")\n",dir->i_ino,
		 (int)dentry->d_name.len,dentry->d_name.name,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:
	inode->i_nlink = 0;
	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("AFFS: link(%u, %u, \"%.*s\")\n", (u32)inode->i_ino, (u32)dir->i_ino,
		 (int)dentry->d_name.len,dentry->d_name.name);

	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("AFFS: rename(old=%u,\"%*s\" to new=%u,\"%*s\")\n",
		 (u32)old_dir->i_ino, (int)old_dentry->d_name.len, old_dentry->d_name.name,
		 (u32)new_dir->i_ino, (int)new_dentry->d_name.len, new_dentry->d_name.name);

	retval = affs_check_name(new_dentry->d_name.name,new_dentry->d_name.len);
	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);
	16	static int affs_hash_dentry(struct dentry , struct qstr );
	17	static int affs_compare_dentry(struct dentry , struct qstr , struct qstr *);
	18	static int affs_intl_toupper(int ch);
	19	static int affs_intl_hash_dentry(struct dentry , struct qstr );
	20	static int affs_intl_compare_dentry(struct dentry , struct qstr , struct qstr *);
	21
e16404ed	22	const struct dentry_operations affs_dentry_operations = {
1da177e4 LT	23	.d_hash = affs_hash_dentry,
	24	.d_compare = affs_compare_dentry,
	25	};
	26
e16404ed	27	static const struct dentry_operations affs_intl_dentry_operations = {
1da177e4 LT	28	.d_hash = affs_intl_hash_dentry,
	29	.d_compare = affs_intl_compare_dentry,
	30	};
	31
	32
	33	/* Simple toupper() for DOS\1 */
	34
	35	static int
	36	affs_toupper(int ch)
	37	{
	38	return ch >= 'a' && ch <= 'z' ? ch -= ('a' - 'A') : ch;
	39	}
	40
	41	/* International toupper() for DOS\3 ("international") */
	42
	43	static int
	44	affs_intl_toupper(int ch)
	45	{
	46	return (ch >= 'a' && ch <= 'z') \|\| (ch >= 0xE0
	47	&& ch <= 0xFE && ch != 0xF7) ?
	48	ch - ('a' - 'A') : ch;
	49	}
	50
	51	static inline toupper_t
	52	affs_get_toupper(struct super_block *sb)
	53	{
	54	return AFFS_SB(sb)->s_flags & SF_INTL ? affs_intl_toupper : affs_toupper;
	55	}
	56
	57	/*
	58	* Note: the dentry argument is the parent dentry.
	59	*/
	60	static inline int
	61	__affs_hash_dentry(struct dentry dentry, struct qstr qstr, toupper_t toupper)
	62	{
	63	const u8 *name = qstr->name;
	64	unsigned long hash;
	65	int i;
	66
	67	i = affs_check_name(qstr->name,qstr->len);
	68	if (i)
	69	return i;
	70
	71	hash = init_name_hash();
	72	i = min(qstr->len, 30u);
	73	for (; i > 0; name++, i--)
	74	hash = partial_name_hash(toupper(*name), hash);
	75	qstr->hash = end_name_hash(hash);
	76
	77	return 0;
	78	}
	79
	80	static int
	81	affs_hash_dentry(struct dentry dentry, struct qstr qstr)
	82	{
	83	return __affs_hash_dentry(dentry, qstr, affs_toupper);
	84	}
	85	static int
	86	affs_intl_hash_dentry(struct dentry dentry, struct qstr qstr)
	87	{
	88	return __affs_hash_dentry(dentry, qstr, affs_intl_toupper);
	89	}
	90
	91	static inline int
92	__affs_compare_dentry(struct dentry dentry, struct qstr a, struct qstr *b, toupper_t toupper)
93	{
94	const u8 *aname = a->name;
95	const u8 *bname = b->name;
96	int len;
97
98	/* 'a' is the qstr of an already existing dentry, so the name
99	* must be valid. 'b' must be validated first.
100	*/
101
102	if (affs_check_name(b->name,b->len))
103	return 1;
104
105	/* If the names are longer than the allowed 30 chars,
106	* the excess is ignored, so their length may differ.
107	*/
108	len = a->len;
109	if (len >= 30) {
110	if (b->len < 30)
111	return 1;
112	len = 30;
113	} else if (len != b->len)
114	return 1;
115
116	for (; len > 0; len--)
117	if (toupper(aname++) != toupper(bname++))
118	return 1;
119
120	return 0;
121	}
122
123	static int
124	affs_compare_dentry(struct dentry dentry, struct qstr a, struct qstr *b)
125	{
126	return __affs_compare_dentry(dentry, a, b, affs_toupper);
127	}
128	static int
129	affs_intl_compare_dentry(struct dentry dentry, struct qstr a, struct qstr *b)
130	{
131	return __affs_compare_dentry(dentry, a, b, affs_intl_toupper);
132	}
133
134	/*
135	* NOTE! unlike strncmp, affs_match returns 1 for success, 0 for failure.
136	*/
137
138	static inline int
139	affs_match(struct dentry dentry, const u8 name2, toupper_t toupper)
140	{
141	const u8 *name = dentry->d_name.name;
142	int len = dentry->d_name.len;
143
144	if (len >= 30) {
145	if (*name2 < 30)
146	return 0;
147	len = 30;
148	} else if (len != *name2)
149	return 0;
150
151	for (name2++; len > 0; len--)
152	if (toupper(name++) != toupper(name2++))
153	return 0;
154	return 1;
155	}
156
157	int
158	affs_hash_name(struct super_block sb, const u8 name, unsigned int len)
159	{
160	toupper_t toupper = affs_get_toupper(sb);
161	int hash;
162
163	hash = len = min(len, 30u);
164	for (; len > 0; len--)
165	hash = (hash * 13 + toupper(*name++)) & 0x7ff;
166
167	return hash % AFFS_SB(sb)->s_hashsize;
168	}
169
170	static struct buffer_head *
171	affs_find_entry(struct inode dir, struct dentry dentry)
172	{
173	struct super_block *sb = dir->i_sb;
174	struct buffer_head *bh;
175	toupper_t toupper = affs_get_toupper(sb);
176	u32 key;
177
178	pr_debug("AFFS: find_entry(\"%.*s\")\n", (int)dentry->d_name.len, dentry->d_name.name);
179
180	bh = affs_bread(sb, dir->i_ino);
181	if (!bh)
182	return ERR_PTR(-EIO);
183
184	key = be32_to_cpu(AFFS_HEAD(bh)->table[affs_hash_name(sb, dentry->d_name.name, dentry->d_name.len)]);
185
186	for (;;) {
187	affs_brelse(bh);
188	if (key == 0)
189	return NULL;
190	bh = affs_bread(sb, key);
191	if (!bh)
192	return ERR_PTR(-EIO);
193	if (affs_match(dentry, AFFS_TAIL(sb, bh)->name, toupper))
194	return bh;
195	key = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain);
196	}
197	}
198
199	struct dentry *
200	affs_lookup(struct inode dir, struct dentry dentry, struct nameidata *nd)
201	{
202	struct super_block *sb = dir->i_sb;
203	struct buffer_head *bh;
204	struct inode *inode = NULL;
205
206	pr_debug("AFFS: lookup(\"%.*s\")\n",(int)dentry->d_name.len,dentry->d_name.name);
207
208	affs_lock_dir(dir);
209	bh = affs_find_entry(dir, dentry);
210	affs_unlock_dir(dir);
210f8559	211	if (IS_ERR(bh))
e231c2ee	212	return ERR_CAST(bh);
1da177e4 LT	213	if (bh) {
	214	u32 ino = bh->b_blocknr;
	215
	216	/* store the real header ino in d_fsdata for faster lookups */
	217	dentry->d_fsdata = (void *)(long)ino;
	218	switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
	219	//link to dirs disabled
	220	//case ST_LINKDIR:
	221	case ST_LINKFILE:
	222	ino = be32_to_cpu(AFFS_TAIL(sb, bh)->original);
	223	}
	224	affs_brelse(bh);
210f8559 DH	225	inode = affs_iget(sb, ino);
210f8559 DH	226	if (IS_ERR(inode))
cccad8f9	227	return ERR_CAST(inode);
1da177e4 LT	228	}
	229	dentry->d_op = AFFS_SB(sb)->s_flags & SF_INTL ? &affs_intl_dentry_operations : &affs_dentry_operations;
	230	d_add(dentry, inode);
	231	return NULL;
	232	}
	233
	234	int
	235	affs_unlink(struct inode dir, struct dentry dentry)
	236	{
dca3c336 RZ	237	pr_debug("AFFS: unlink(dir=%d, %lu \"%.*s\")\n", (u32)dir->i_ino,
dca3c336 RZ	238	dentry->d_inode->i_ino,
1da177e4 LT	239	(int)dentry->d_name.len, dentry->d_name.name);
	240
	241	return affs_remove_header(dentry);
	242	}
	243
	244	int
	245	affs_create(struct inode dir, struct dentry dentry, int mode, struct nameidata *nd)
	246	{
	247	struct super_block *sb = dir->i_sb;
	248	struct inode *inode;
	249	int error;
	250
	251	pr_debug("AFFS: create(%lu,\"%.*s\",0%o)\n",dir->i_ino,(int)dentry->d_name.len,
	252	dentry->d_name.name,mode);
	253
	254	inode = affs_new_inode(dir);
	255	if (!inode)
	256	return -ENOSPC;
	257
	258	inode->i_mode = mode;
	259	mode_to_prot(inode);
	260	mark_inode_dirty(inode);
	261
	262	inode->i_op = &affs_file_inode_operations;
	263	inode->i_fop = &affs_file_operations;
	264	inode->i_mapping->a_ops = (AFFS_SB(sb)->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
	265	error = affs_add_entry(dir, inode, dentry, ST_FILE);
	266	if (error) {
	267	inode->i_nlink = 0;
	268	iput(inode);
	269	return error;
	270	}
	271	return 0;
	272	}
	273
	274	int
	275	affs_mkdir(struct inode dir, struct dentry dentry, int mode)
	276	{
	277	struct inode *inode;
	278	int error;
	279
	280	pr_debug("AFFS: mkdir(%lu,\"%.*s\",0%o)\n",dir->i_ino,
	281	(int)dentry->d_name.len,dentry->d_name.name,mode);
	282
	283	inode = affs_new_inode(dir);
	284	if (!inode)
	285	return -ENOSPC;
	286
	287	inode->i_mode = S_IFDIR \| mode;
	288	mode_to_prot(inode);
	289
	290	inode->i_op = &affs_dir_inode_operations;
	291	inode->i_fop = &affs_dir_operations;
	292
	293	error = affs_add_entry(dir, inode, dentry, ST_USERDIR);
	294	if (error) {
	295	inode->i_nlink = 0;
	296	mark_inode_dirty(inode);
	297	iput(inode);
	298	return error;
	299	}
	300	return 0;
	301	}
	302
303	int
304	affs_rmdir(struct inode dir, struct dentry dentry)
305	{
dca3c336 RZ	306	pr_debug("AFFS: rmdir(dir=%u, %lu \"%.*s\")\n", (u32)dir->i_ino,
dca3c336 RZ	307	dentry->d_inode->i_ino,
1da177e4 LT	308	(int)dentry->d_name.len, dentry->d_name.name);
	309
	310	return affs_remove_header(dentry);
	311	}
	312
	313	int
	314	affs_symlink(struct inode dir, struct dentry dentry, const char *symname)
	315	{
	316	struct super_block *sb = dir->i_sb;
	317	struct buffer_head *bh;
	318	struct inode *inode;
	319	char *p;
	320	int i, maxlen, error;
	321	char c, lc;
	322
	323	pr_debug("AFFS: symlink(%lu,\"%.*s\" -> \"%s\")\n",dir->i_ino,
	324	(int)dentry->d_name.len,dentry->d_name.name,symname);
	325
	326	maxlen = AFFS_SB(sb)->s_hashsize * sizeof(u32) - 1;
	327	inode = affs_new_inode(dir);
	328	if (!inode)
	329	return -ENOSPC;
	330
	331	inode->i_op = &affs_symlink_inode_operations;
	332	inode->i_data.a_ops = &affs_symlink_aops;
	333	inode->i_mode = S_IFLNK \| 0777;
	334	mode_to_prot(inode);
	335
	336	error = -EIO;
	337	bh = affs_bread(sb, inode->i_ino);
	338	if (!bh)
	339	goto err;
	340	i = 0;
	341	p = (char *)AFFS_HEAD(bh)->table;
	342	lc = '/';
	343	if (*symname == '/') {
29333920	344	struct affs_sb_info *sbi = AFFS_SB(sb);
1da177e4 LT	345	while (*symname == '/')
1da177e4 LT	346	symname++;
29333920 AV	347	spin_lock(&sbi->symlink_lock);
	348	while (sbi->s_volume[i]) /* Cannot overflow */
	349	*p++ = sbi->s_volume[i++];
	350	spin_unlock(&sbi->symlink_lock);
1da177e4 LT	351	}
	352	while (i < maxlen && (c = *symname++)) {
	353	if (c == '.' && lc == '/' && *symname == '.' && symname[1] == '/') {
	354	*p++ = '/';
	355	i++;
	356	symname += 2;
	357	lc = '/';
	358	} else if (c == '.' && lc == '/' && *symname == '/') {
	359	symname++;
	360	lc = '/';
	361	} else {
	362	*p++ = c;
	363	lc = c;
	364	i++;
	365	}
	366	if (lc == '/')
	367	while (*symname == '/')
	368	symname++;
	369	}
	370	*p = 0;
	371	mark_buffer_dirty_inode(bh, inode);
	372	affs_brelse(bh);
	373	mark_inode_dirty(inode);
	374
	375	error = affs_add_entry(dir, inode, dentry, ST_SOFTLINK);
	376	if (error)
	377	goto err;
	378
	379	return 0;
	380
	381	err:
	382	inode->i_nlink = 0;
	383	mark_inode_dirty(inode);
	384	iput(inode);
	385	return error;
	386	}
	387
	388	int
	389	affs_link(struct dentry old_dentry, struct inode dir, struct dentry *dentry)
	390	{
	391	struct inode *inode = old_dentry->d_inode;
	392
	393	pr_debug("AFFS: link(%u, %u, \"%.*s\")\n", (u32)inode->i_ino, (u32)dir->i_ino,
	394	(int)dentry->d_name.len,dentry->d_name.name);
	395
	396	return affs_add_entry(dir, inode, dentry, ST_LINKFILE);
	397	}
	398
	399	int
	400	affs_rename(struct inode old_dir, struct dentry old_dentry,
	401	struct inode new_dir, struct dentry new_dentry)
	402	{
	403	struct super_block *sb = old_dir->i_sb;
	404	struct buffer_head *bh = NULL;
	405	int retval;
	406
	407	pr_debug("AFFS: rename(old=%u,\"%s\" to new=%u,\"%s\")\n",
	408	(u32)old_dir->i_ino, (int)old_dentry->d_name.len, old_dentry->d_name.name,
	409	(u32)new_dir->i_ino, (int)new_dentry->d_name.len, new_dentry->d_name.name);
	410
	411	retval = affs_check_name(new_dentry->d_name.name,new_dentry->d_name.len);
	412	if (retval)
	413	return retval;
	414
415	/* Unlink destination if it already exists */
416	if (new_dentry->d_inode) {
417	retval = affs_remove_header(new_dentry);
418	if (retval)
419	return retval;
420	}
421
1da177e4 LT	422	bh = affs_bread(sb, old_dentry->d_inode->i_ino);
1da177e4 LT	423	if (!bh)
3ac81413	424	return -EIO;
1da177e4 LT	425
	426	/* Remove header from its parent directory. */
	427	affs_lock_dir(old_dir);
	428	retval = affs_remove_hash(old_dir, bh);
	429	affs_unlock_dir(old_dir);
	430	if (retval)
	431	goto done;
	432
	433	/* And insert it into the new directory with the new name. */
	434	affs_copy_name(AFFS_TAIL(sb, bh)->name, new_dentry);
	435	affs_fix_checksum(sb, bh);
	436	affs_lock_dir(new_dir);
	437	retval = affs_insert_hash(new_dir, bh);
	438	affs_unlock_dir(new_dir);
	439	/* TODO: move it back to old_dir, if error? */
	440
	441	done:
	442	mark_buffer_dirty_inode(bh, retval ? old_dir : new_dir);
	443	affs_brelse(bh);
	444	return retval;
	445	}