[mirror_ubuntu-artful-kernel.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"
#include <linux/exportfs.h>

typedef int (*toupper_t)(int);

/* 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_test_opt(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(const struct dentry *dentry, struct qstr *qstr, toupper_t toupper, bool notruncate)
{
	const u8 *name = qstr->name;
	unsigned long hash;
	int retval;
	u32 len;

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

	hash = init_name_hash(dentry);
	len = min(qstr->len, AFFSNAMEMAX);
	for (; len > 0; name++, len--)
		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(dentry, qstr, affs_toupper,
				  affs_nofilenametruncate(dentry));

}

static int
affs_intl_hash_dentry(const struct dentry *dentry, struct qstr *qstr)
{
	return __affs_hash_dentry(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 >= AFFSNAMEMAX) {
		if (name->len < AFFSNAMEMAX)
			return 1;
		len = AFFSNAMEMAX;
	} 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 *dentry,
		unsigned int len, const char *str, const struct qstr *name)
{

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

static int
affs_intl_compare_dentry(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(dentry));

}

/*
 * 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 >= AFFSNAMEMAX) {
		if (*name2 < AFFSNAMEMAX)
			return 0;
		len = AFFSNAMEMAX;
	} 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);
	u32 hash;

	hash = len = min(len, AFFSNAMEMAX);
	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=%lu, %lu \"%pd\")\n", __func__, dir->i_ino,
		 d_inode(dentry)->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;
	affs_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_test_opt(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;
	affs_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=%lu, %lu \"%pd\")\n", __func__, dir->i_ino,
		 d_inode(dentry)->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_nohighmem(inode);
	inode->i_data.a_ops = &affs_symlink_aops;
	inode->i_mode = S_IFLNK | 0777;
	affs_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 = d_inode(old_dentry);

	pr_debug("%s(%lu, %lu, \"%pd\")\n", __func__, inode->i_ino, 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,
	    unsigned int flags)
{
	struct super_block *sb = old_dir->i_sb;
	struct buffer_head *bh = NULL;
	int retval;

	if (flags & ~RENAME_NOREPLACE)
		return -EINVAL;

	pr_debug("%s(old=%lu,\"%pd\" to new=%lu,\"%pd\")\n", __func__,
		 old_dir->i_ino, old_dentry, 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 (d_really_is_positive(new_dentry)) {
		retval = affs_remove_header(new_dentry);
		if (retval)
			return retval;
	}

	bh = affs_bread(sb, d_inode(old_dentry)->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;
}

static struct dentry *affs_get_parent(struct dentry *child)
{
	struct inode *parent;
	struct buffer_head *bh;

	bh = affs_bread(child->d_sb, d_inode(child)->i_ino);
	if (!bh)
		return ERR_PTR(-EIO);

	parent = affs_iget(child->d_sb,
			   be32_to_cpu(AFFS_TAIL(child->d_sb, bh)->parent));
	brelse(bh);
	if (IS_ERR(parent))
		return ERR_CAST(parent);

	return d_obtain_alias(parent);
}

static struct inode *affs_nfs_get_inode(struct super_block *sb, u64 ino,
					u32 generation)
{
	struct inode *inode;

	if (!affs_validblock(sb, ino))
		return ERR_PTR(-ESTALE);

	inode = affs_iget(sb, ino);
	if (IS_ERR(inode))
		return ERR_CAST(inode);

	if (generation && inode->i_generation != generation) {
		iput(inode);
		return ERR_PTR(-ESTALE);
	}

	return inode;
}

static struct dentry *affs_fh_to_dentry(struct super_block *sb, struct fid *fid,
					int fh_len, int fh_type)
{
	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
				    affs_nfs_get_inode);
}

static struct dentry *affs_fh_to_parent(struct super_block *sb, struct fid *fid,
					int fh_len, int fh_type)
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
				    affs_nfs_get_inode);
}

const struct export_operations affs_export_ops = {
	.fh_to_dentry = affs_fh_to_dentry,
	.fh_to_parent = affs_fh_to_parent,
	.get_parent = affs_get_parent,
};

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,
};
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"
ed4433d7	12	#include <linux/exportfs.h>
1da177e4 LT	13
	14	typedef int (*toupper_t)(int);
	15
1da177e4 LT	16	/* Simple toupper() for DOS\1 */
	17
	18	static int
	19	affs_toupper(int ch)
	20	{
	21	return ch >= 'a' && ch <= 'z' ? ch -= ('a' - 'A') : ch;
	22	}
	23
	24	/* International toupper() for DOS\3 ("international") */
	25
	26	static int
	27	affs_intl_toupper(int ch)
	28	{
	29	return (ch >= 'a' && ch <= 'z') \|\| (ch >= 0xE0
	30	&& ch <= 0xFE && ch != 0xF7) ?
	31	ch - ('a' - 'A') : ch;
	32	}
	33
	34	static inline toupper_t
	35	affs_get_toupper(struct super_block *sb)
	36	{
79bda4d5 FF	37	return affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL) ?
79bda4d5 FF	38	affs_intl_toupper : affs_toupper;
1da177e4 LT	39	}
	40
	41	/*
	42	* Note: the dentry argument is the parent dentry.
	43	*/
	44	static inline int
8387ff25	45	__affs_hash_dentry(const struct dentry dentry, struct qstr qstr, toupper_t toupper, bool notruncate)
1da177e4 LT	46	{
	47	const u8 *name = qstr->name;
	48	unsigned long hash;
eeb36f8e FF	49	int retval;
eeb36f8e FF	50	u32 len;
1da177e4	51
eeb36f8e FF	52	retval = affs_check_name(qstr->name, qstr->len, notruncate);
	53	if (retval)
	54	return retval;
1da177e4	55
8387ff25	56	hash = init_name_hash(dentry);
f157853e	57	len = min(qstr->len, AFFSNAMEMAX);
eeb36f8e	58	for (; len > 0; name++, len--)
1da177e4 LT	59	hash = partial_name_hash(toupper(*name), hash);
	60	qstr->hash = end_name_hash(hash);
	61
	62	return 0;
	63	}
	64
	65	static int
da53be12	66	affs_hash_dentry(const struct dentry dentry, struct qstr qstr)
1da177e4	67	{
8387ff25	68	return __affs_hash_dentry(dentry, qstr, affs_toupper,
8ca57722 FF	69	affs_nofilenametruncate(dentry));
8ca57722 FF	70
1da177e4	71	}
8ca57722	72
1da177e4	73	static int
da53be12	74	affs_intl_hash_dentry(const struct dentry dentry, struct qstr qstr)
1da177e4	75	{
8387ff25	76	return __affs_hash_dentry(dentry, qstr, affs_intl_toupper,
8ca57722 FF	77	affs_nofilenametruncate(dentry));
8ca57722 FF	78
1da177e4 LT	79	}
1da177e4 LT	80
621e155a	81	static inline int __affs_compare_dentry(unsigned int len,
8ca57722 FF	82	const char str, const struct qstr name, toupper_t toupper,
8ca57722 FF	83	bool notruncate)
1da177e4	84	{
621e155a NP	85	const u8 *aname = str;
621e155a NP	86	const u8 *bname = name->name;
1da177e4	87
621e155a NP	88	/*
	89	* 'str' is the name of an already existing dentry, so the name
	90	* must be valid. 'name' must be validated first.
1da177e4 LT	91	*/
1da177e4 LT	92
8ca57722	93	if (affs_check_name(name->name, name->len, notruncate))
1da177e4 LT	94	return 1;
1da177e4 LT	95
621e155a NP	96	/*
621e155a NP	97	* If the names are longer than the allowed 30 chars,
1da177e4 LT	98	* the excess is ignored, so their length may differ.
1da177e4 LT	99	*/
f157853e FF	100	if (len >= AFFSNAMEMAX) {
f157853e FF	101	if (name->len < AFFSNAMEMAX)
1da177e4	102	return 1;
f157853e	103	len = AFFSNAMEMAX;
621e155a	104	} else if (len != name->len)
1da177e4 LT	105	return 1;
	106
	107	for (; len > 0; len--)
	108	if (toupper(aname++) != toupper(bname++))
	109	return 1;
	110
	111	return 0;
	112	}
	113
	114	static int
6fa67e70	115	affs_compare_dentry(const struct dentry *dentry,
621e155a	116	unsigned int len, const char str, const struct qstr name)
1da177e4	117	{
8ca57722 FF	118
8ca57722 FF	119	return __affs_compare_dentry(len, str, name, affs_toupper,
e0b3f595	120	affs_nofilenametruncate(dentry));
1da177e4	121	}
8ca57722	122
1da177e4	123	static int
6fa67e70	124	affs_intl_compare_dentry(const struct dentry *dentry,
621e155a	125	unsigned int len, const char str, const struct qstr name)
1da177e4	126	{
8ca57722	127	return __affs_compare_dentry(len, str, name, affs_intl_toupper,
e0b3f595	128	affs_nofilenametruncate(dentry));
8ca57722	129
1da177e4 LT	130	}
	131
	132	/*
	133	* NOTE! unlike strncmp, affs_match returns 1 for success, 0 for failure.
	134	*/
	135
	136	static inline int
	137	affs_match(struct dentry dentry, const u8 name2, toupper_t toupper)
	138	{
	139	const u8 *name = dentry->d_name.name;
	140	int len = dentry->d_name.len;
	141
f157853e FF	142	if (len >= AFFSNAMEMAX) {
f157853e FF	143	if (*name2 < AFFSNAMEMAX)
1da177e4	144	return 0;
f157853e	145	len = AFFSNAMEMAX;
1da177e4 LT	146	} else if (len != *name2)
	147	return 0;
	148
	149	for (name2++; len > 0; len--)
	150	if (toupper(name++) != toupper(name2++))
	151	return 0;
	152	return 1;
	153	}
	154
	155	int
	156	affs_hash_name(struct super_block sb, const u8 name, unsigned int len)
	157	{
	158	toupper_t toupper = affs_get_toupper(sb);
eeb36f8e	159	u32 hash;
1da177e4	160
f157853e	161	hash = len = min(len, AFFSNAMEMAX);
1da177e4 LT	162	for (; len > 0; len--)
	163	hash = (hash * 13 + toupper(*name++)) & 0x7ff;
	164
	165	return hash % AFFS_SB(sb)->s_hashsize;
	166	}
	167
	168	static struct buffer_head *
	169	affs_find_entry(struct inode dir, struct dentry dentry)
	170	{
	171	struct super_block *sb = dir->i_sb;
	172	struct buffer_head *bh;
	173	toupper_t toupper = affs_get_toupper(sb);
	174	u32 key;
	175
a455589f	176	pr_debug("%s(\"%pd\")\n", __func__, dentry);
1da177e4 LT	177
	178	bh = affs_bread(sb, dir->i_ino);
	179	if (!bh)
	180	return ERR_PTR(-EIO);
	181
	182	key = be32_to_cpu(AFFS_HEAD(bh)->table[affs_hash_name(sb, dentry->d_name.name, dentry->d_name.len)]);
	183
	184	for (;;) {
	185	affs_brelse(bh);
	186	if (key == 0)
	187	return NULL;
	188	bh = affs_bread(sb, key);
	189	if (!bh)
	190	return ERR_PTR(-EIO);
	191	if (affs_match(dentry, AFFS_TAIL(sb, bh)->name, toupper))
	192	return bh;
	193	key = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain);
	194	}
	195	}
	196
	197	struct dentry *
00cd8dd3	198	affs_lookup(struct inode dir, struct dentry dentry, unsigned int flags)
1da177e4 LT	199	{
	200	struct super_block *sb = dir->i_sb;
	201	struct buffer_head *bh;
	202	struct inode *inode = NULL;
	203
a455589f	204	pr_debug("%s(\"%pd\")\n", __func__, dentry);
1da177e4 LT	205
	206	affs_lock_dir(dir);
	207	bh = affs_find_entry(dir, dentry);
	208	affs_unlock_dir(dir);
210f8559	209	if (IS_ERR(bh))
e231c2ee	210	return ERR_CAST(bh);
1da177e4 LT	211	if (bh) {
	212	u32 ino = bh->b_blocknr;
	213
	214	/* store the real header ino in d_fsdata for faster lookups */
	215	dentry->d_fsdata = (void *)(long)ino;
	216	switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
	217	//link to dirs disabled
	218	//case ST_LINKDIR:
	219	case ST_LINKFILE:
	220	ino = be32_to_cpu(AFFS_TAIL(sb, bh)->original);
	221	}
	222	affs_brelse(bh);
210f8559 DH	223	inode = affs_iget(sb, ino);
210f8559 DH	224	if (IS_ERR(inode))
cccad8f9	225	return ERR_CAST(inode);
1da177e4	226	}
1da177e4 LT	227	d_add(dentry, inode);
	228	return NULL;
	229	}
	230
	231	int
	232	affs_unlink(struct inode dir, struct dentry dentry)
	233	{
08fe100d	234	pr_debug("%s(dir=%lu, %lu \"%pd\")\n", __func__, dir->i_ino,
2b0143b5	235	d_inode(dentry)->i_ino, dentry);
1da177e4 LT	236
	237	return affs_remove_header(dentry);
	238	}
	239
	240	int
ebfc3b49	241	affs_create(struct inode dir, struct dentry dentry, umode_t mode, bool excl)
1da177e4 LT	242	{
	243	struct super_block *sb = dir->i_sb;
	244	struct inode *inode;
	245	int error;
	246
a455589f AV	247	pr_debug("%s(%lu,\"%pd\",0%ho)\n",
a455589f AV	248	__func__, dir->i_ino, dentry, mode);
1da177e4 LT	249
	250	inode = affs_new_inode(dir);
	251	if (!inode)
	252	return -ENOSPC;
	253
	254	inode->i_mode = mode;
c1618208	255	affs_mode_to_prot(inode);
1da177e4 LT	256	mark_inode_dirty(inode);
	257
	258	inode->i_op = &affs_file_inode_operations;
	259	inode->i_fop = &affs_file_operations;
79bda4d5	260	inode->i_mapping->a_ops = affs_test_opt(AFFS_SB(sb)->s_flags, SF_OFS) ?
a0016ff2	261	&affs_aops_ofs : &affs_aops;
1da177e4 LT	262	error = affs_add_entry(dir, inode, dentry, ST_FILE);
1da177e4 LT	263	if (error) {
6d6b77f1	264	clear_nlink(inode);
1da177e4 LT	265	iput(inode);
	266	return error;
	267	}
	268	return 0;
	269	}
	270
	271	int
18bb1db3	272	affs_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
1da177e4 LT	273	{
	274	struct inode *inode;
	275	int error;
	276
a455589f AV	277	pr_debug("%s(%lu,\"%pd\",0%ho)\n",
a455589f AV	278	__func__, dir->i_ino, dentry, mode);
1da177e4 LT	279
	280	inode = affs_new_inode(dir);
	281	if (!inode)
	282	return -ENOSPC;
	283
	284	inode->i_mode = S_IFDIR \| mode;
c1618208	285	affs_mode_to_prot(inode);
1da177e4 LT	286
	287	inode->i_op = &affs_dir_inode_operations;
	288	inode->i_fop = &affs_dir_operations;
	289
	290	error = affs_add_entry(dir, inode, dentry, ST_USERDIR);
	291	if (error) {
6d6b77f1	292	clear_nlink(inode);
1da177e4 LT	293	mark_inode_dirty(inode);
	294	iput(inode);
	295	return error;
	296	}
	297	return 0;
	298	}
	299
	300	int
	301	affs_rmdir(struct inode dir, struct dentry dentry)
	302	{
08fe100d	303	pr_debug("%s(dir=%lu, %lu \"%pd\")\n", __func__, dir->i_ino,
2b0143b5	304	d_inode(dentry)->i_ino, dentry);
1da177e4 LT	305
	306	return affs_remove_header(dentry);
	307	}
	308
	309	int
	310	affs_symlink(struct inode dir, struct dentry dentry, const char *symname)
	311	{
	312	struct super_block *sb = dir->i_sb;
	313	struct buffer_head *bh;
	314	struct inode *inode;
	315	char *p;
	316	int i, maxlen, error;
	317	char c, lc;
	318
a455589f AV	319	pr_debug("%s(%lu,\"%pd\" -> \"%s\")\n",
a455589f AV	320	__func__, dir->i_ino, dentry, symname);
1da177e4 LT	321
	322	maxlen = AFFS_SB(sb)->s_hashsize * sizeof(u32) - 1;
	323	inode = affs_new_inode(dir);
	324	if (!inode)
	325	return -ENOSPC;
	326
	327	inode->i_op = &affs_symlink_inode_operations;
21fc61c7	328	inode_nohighmem(inode);
1da177e4 LT	329	inode->i_data.a_ops = &affs_symlink_aops;
1da177e4 LT	330	inode->i_mode = S_IFLNK \| 0777;
c1618208	331	affs_mode_to_prot(inode);
1da177e4 LT	332
	333	error = -EIO;
	334	bh = affs_bread(sb, inode->i_ino);
	335	if (!bh)
	336	goto err;
	337	i = 0;
	338	p = (char *)AFFS_HEAD(bh)->table;
	339	lc = '/';
	340	if (*symname == '/') {
29333920	341	struct affs_sb_info *sbi = AFFS_SB(sb);
1da177e4 LT	342	while (*symname == '/')
1da177e4 LT	343	symname++;
29333920 AV	344	spin_lock(&sbi->symlink_lock);
	345	while (sbi->s_volume[i]) /* Cannot overflow */
	346	*p++ = sbi->s_volume[i++];
	347	spin_unlock(&sbi->symlink_lock);
1da177e4 LT	348	}
	349	while (i < maxlen && (c = *symname++)) {
	350	if (c == '.' && lc == '/' && *symname == '.' && symname[1] == '/') {
	351	*p++ = '/';
	352	i++;
	353	symname += 2;
	354	lc = '/';
	355	} else if (c == '.' && lc == '/' && *symname == '/') {
	356	symname++;
	357	lc = '/';
	358	} else {
	359	*p++ = c;
	360	lc = c;
	361	i++;
	362	}
	363	if (lc == '/')
	364	while (*symname == '/')
	365	symname++;
	366	}
	367	*p = 0;
	368	mark_buffer_dirty_inode(bh, inode);
	369	affs_brelse(bh);
	370	mark_inode_dirty(inode);
	371
	372	error = affs_add_entry(dir, inode, dentry, ST_SOFTLINK);
	373	if (error)
	374	goto err;
	375
	376	return 0;
	377
	378	err:
6d6b77f1	379	clear_nlink(inode);
1da177e4 LT	380	mark_inode_dirty(inode);
	381	iput(inode);
	382	return error;
	383	}
	384
	385	int
	386	affs_link(struct dentry old_dentry, struct inode dir, struct dentry *dentry)
	387	{
2b0143b5	388	struct inode *inode = d_inode(old_dentry);
1da177e4	389
08fe100d	390	pr_debug("%s(%lu, %lu, \"%pd\")\n", __func__, inode->i_ino, dir->i_ino,
a455589f	391	dentry);
1da177e4 LT	392
	393	return affs_add_entry(dir, inode, dentry, ST_LINKFILE);
	394	}
	395
	396	int
	397	affs_rename(struct inode old_dir, struct dentry old_dentry,
f03b8ad8 MS	398	struct inode new_dir, struct dentry new_dentry,
f03b8ad8 MS	399	unsigned int flags)
1da177e4 LT	400	{
	401	struct super_block *sb = old_dir->i_sb;
	402	struct buffer_head *bh = NULL;
	403	int retval;
	404
f03b8ad8 MS	405	if (flags & ~RENAME_NOREPLACE)
	406	return -EINVAL;
	407
08fe100d GU	408	pr_debug("%s(old=%lu,\"%pd\" to new=%lu,\"%pd\")\n", __func__,
08fe100d GU	409	old_dir->i_ino, old_dentry, new_dir->i_ino, new_dentry);
1da177e4	410
8ca57722 FF	411	retval = affs_check_name(new_dentry->d_name.name,
	412	new_dentry->d_name.len,
	413	affs_nofilenametruncate(old_dentry));
	414
1da177e4 LT	415	if (retval)
	416	return retval;
	417
	418	/* Unlink destination if it already exists */
2b0143b5	419	if (d_really_is_positive(new_dentry)) {
1da177e4 LT	420	retval = affs_remove_header(new_dentry);
	421	if (retval)
	422	return retval;
	423	}
	424
2b0143b5	425	bh = affs_bread(sb, d_inode(old_dentry)->i_ino);
1da177e4	426	if (!bh)
3ac81413	427	return -EIO;
1da177e4 LT	428
	429	/* Remove header from its parent directory. */
	430	affs_lock_dir(old_dir);
	431	retval = affs_remove_hash(old_dir, bh);
	432	affs_unlock_dir(old_dir);
	433	if (retval)
	434	goto done;
	435
	436	/* And insert it into the new directory with the new name. */
	437	affs_copy_name(AFFS_TAIL(sb, bh)->name, new_dentry);
	438	affs_fix_checksum(sb, bh);
	439	affs_lock_dir(new_dir);
	440	retval = affs_insert_hash(new_dir, bh);
	441	affs_unlock_dir(new_dir);
	442	/* TODO: move it back to old_dir, if error? */
	443
	444	done:
	445	mark_buffer_dirty_inode(bh, retval ? old_dir : new_dir);
	446	affs_brelse(bh);
	447	return retval;
	448	}
ed4433d7	449
b3b42c0d FF	450	static struct dentry affs_get_parent(struct dentry child)
	451	{
	452	struct inode *parent;
	453	struct buffer_head *bh;
	454
	455	bh = affs_bread(child->d_sb, d_inode(child)->i_ino);
	456	if (!bh)
	457	return ERR_PTR(-EIO);
	458
	459	parent = affs_iget(child->d_sb,
	460	be32_to_cpu(AFFS_TAIL(child->d_sb, bh)->parent));
	461	brelse(bh);
	462	if (IS_ERR(parent))
	463	return ERR_CAST(parent);
	464
	465	return d_obtain_alias(parent);
	466	}
	467
ed4433d7 FF	468	static struct inode affs_nfs_get_inode(struct super_block sb, u64 ino,
	469	u32 generation)
	470	{
	471	struct inode *inode;
	472
	473	if (!affs_validblock(sb, ino))
	474	return ERR_PTR(-ESTALE);
	475
	476	inode = affs_iget(sb, ino);
	477	if (IS_ERR(inode))
	478	return ERR_CAST(inode);
	479
	480	if (generation && inode->i_generation != generation) {
	481	iput(inode);
	482	return ERR_PTR(-ESTALE);
	483	}
	484
	485	return inode;
	486	}
	487
	488	static struct dentry affs_fh_to_dentry(struct super_block sb, struct fid *fid,
	489	int fh_len, int fh_type)
	490	{
	491	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
	492	affs_nfs_get_inode);
	493	}
	494
	495	static struct dentry affs_fh_to_parent(struct super_block sb, struct fid *fid,
	496	int fh_len, int fh_type)
	497	{
	498	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
	499	affs_nfs_get_inode);
	500	}
	501
	502	const struct export_operations affs_export_ops = {
	503	.fh_to_dentry = affs_fh_to_dentry,
	504	.fh_to_parent = affs_fh_to_parent,
b3b42c0d	505	.get_parent = affs_get_parent,
ed4433d7	506	};
f567accb FF	507
	508	const struct dentry_operations affs_dentry_operations = {
	509	.d_hash = affs_hash_dentry,
	510	.d_compare = affs_compare_dentry,
	511	};
	512
	513	const struct dentry_operations affs_intl_dentry_operations = {
	514	.d_hash = affs_intl_hash_dentry,
	515	.d_compare = affs_intl_compare_dentry,
	516	};