Release 4.11 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;
}

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Linus Torvalds (pre-git)
28
100.00%
2
100.00%
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28
100.00%
2
100.00%

/* 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;
}

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Linus Torvalds (pre-git)
44
100.00%
2
100.00%
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44
100.00%
2
100.00%


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;
}

Contributors
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CommitProp
Linus Torvalds
15
51.72%
1
25.00%
Linus Torvalds (pre-git)
6
20.69%
1
25.00%
Fabian Frederick
5
17.24%
1
25.00%
Brian Gerst
3
10.34%
1
25.00%
Total
29
100.00%
4
100.00%

/*
 * 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;
}

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Linus Torvalds (pre-git)
66
54.55%
2
22.22%
Linus Torvalds
39
32.23%
4
44.44%
Fabian Frederick
16
13.22%
3
33.33%
Total
121
100.00%
9
100.00%


static int

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

}

Contributors
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CommitProp
Linus Torvalds
15
46.88%
2
40.00%
Linus Torvalds (pre-git)
11
34.38%
1
20.00%
Fabian Frederick
5
15.62%
1
20.00%
Nicholas Piggin
1
3.12%
1
20.00%
Total
32
100.00%
5
100.00%


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));

}

Contributors
Person
Tokens
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CommitProp
Linus Torvalds
20
62.50%
2
40.00%
Linus Torvalds (pre-git)
6
18.75%
1
20.00%
Fabian Frederick
5
15.62%
1
20.00%
Nicholas Piggin
1
3.12%
1
20.00%
Total
32
100.00%
5
100.00%



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;
}

Contributors
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CommitProp
Linus Torvalds (pre-git)
60
45.80%
4
50.00%
Linus Torvalds
47
35.88%
1
12.50%
Nicholas Piggin
16
12.21%
1
12.50%
Fabian Frederick
8
6.11%
2
25.00%
Total
131
100.00%
8
100.00%


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));
}

Contributors
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CommitProp
Linus Torvalds
23
52.27%
1
25.00%
Nicholas Piggin
16
36.36%
1
25.00%
Fabian Frederick
4
9.09%
1
25.00%
Al Viro
1
2.27%
1
25.00%
Total
44
100.00%
4
100.00%


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));

}

Contributors
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CommitProp
Linus Torvalds
22
50.00%
1
25.00%
Nicholas Piggin
17
38.64%
1
25.00%
Fabian Frederick
4
9.09%
1
25.00%
Al Viro
1
2.27%
1
25.00%
Total
44
100.00%
4
100.00%

/*
 * 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;
}

Contributors
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CommitProp
Linus Torvalds (pre-git)
56
52.34%
3
60.00%
Linus Torvalds
48
44.86%
1
20.00%
Fabian Frederick
3
2.80%
1
20.00%
Total
107
100.00%
5
100.00%


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;
}

Contributors
Person
Tokens
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CommitProp
Linus Torvalds (pre-git)
39
50.00%
2
28.57%
Linus Torvalds
34
43.59%
2
28.57%
Brian Gerst
3
3.85%
1
14.29%
Fabian Frederick
2
2.56%
2
28.57%
Total
78
100.00%
7
100.00%


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);
	}
}

Contributors
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Linus Torvalds (pre-git)
116
63.74%
4
57.14%
Linus Torvalds
63
34.62%
1
14.29%
Fabian Frederick
2
1.10%
1
14.29%
Al Viro
1
0.55%
1
14.29%
Total
182
100.00%
7
100.00%


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;
}

Contributors
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Tokens
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CommitProp
Linus Torvalds (pre-git)
96
52.75%
4
28.57%
Linus Torvalds
70
38.46%
3
21.43%
David Howells
8
4.40%
2
14.29%
Al Viro
4
2.20%
2
14.29%
Fabian Frederick
2
1.10%
1
7.14%
Julia Lawall
1
0.55%
1
7.14%
Trond Myklebust
1
0.55%
1
7.14%
Total
182
100.00%
14
100.00%


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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
24
58.54%
4
44.44%
Linus Torvalds
7
17.07%
1
11.11%
Roman Zippel
4
9.76%
1
11.11%
David Howells
3
7.32%
1
11.11%
Fabian Frederick
2
4.88%
1
11.11%
Geert Uytterhoeven
1
2.44%
1
11.11%
Total
41
100.00%
9
100.00%


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;
}

Contributors
Person
Tokens
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Commits
CommitProp
Linus Torvalds (pre-git)
106
67.09%
6
37.50%
Linus Torvalds
33
20.89%
1
6.25%
Fabian Frederick
8
5.06%
3
18.75%
Al Viro
4
2.53%
3
18.75%
Miklos Szeredi
3
1.90%
1
6.25%
Brian Gerst
3
1.90%
1
6.25%
Trond Myklebust
1
0.63%
1
6.25%
Total
158
100.00%
16
100.00%


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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
91
73.39%
4
40.00%
Linus Torvalds
25
20.16%
1
10.00%
Miklos Szeredi
3
2.42%
1
10.00%
Fabian Frederick
3
2.42%
2
20.00%
Al Viro
2
1.61%
2
20.00%
Total
124
100.00%
10
100.00%


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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
29
70.73%
2
28.57%
Roman Zippel
4
9.76%
1
14.29%
David Howells
3
7.32%
1
14.29%
Fabian Frederick
2
4.88%
1
14.29%
Linus Torvalds
2
4.88%
1
14.29%
Geert Uytterhoeven
1
2.44%
1
14.29%
Total
41
100.00%
7
100.00%


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;
}

Contributors
Person
Tokens
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Commits
CommitProp
Linus Torvalds (pre-git)
347
81.26%
6
40.00%
Linus Torvalds
35
8.20%
2
13.33%
Al Viro
34
7.96%
3
20.00%
Brian Gerst
5
1.17%
1
6.67%
Miklos Szeredi
3
0.70%
1
6.67%
Fabian Frederick
3
0.70%
2
13.33%
Total
427
100.00%
15
100.00%


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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
48
81.36%
3
37.50%
Linus Torvalds
4
6.78%
1
12.50%
David Howells
3
5.08%
1
12.50%
Fabian Frederick
2
3.39%
1
12.50%
Geert Uytterhoeven
1
1.69%
1
12.50%
Andrew Morton
1
1.69%
1
12.50%
Total
59
100.00%
8
100.00%


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;
}

Contributors
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Tokens
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CommitProp
Linus Torvalds (pre-git)
134
54.92%
5
33.33%
Linus Torvalds
70
28.69%
3
20.00%
Miklos Szeredi
15
6.15%
1
6.67%
Fabian Frederick
7
2.87%
2
13.33%
Andrew Morton
7
2.87%
1
6.67%
David Howells
6
2.46%
1
6.67%
Florin Malita
4
1.64%
1
6.67%
Geert Uytterhoeven
1
0.41%
1
6.67%
Total
244
100.00%
15
100.00%



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);
}

Contributors
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Fabian Frederick
98
100.00%
1
100.00%
Total
98
100.00%
1
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fabian Frederick
90
100.00%
1
100.00%
Total
90
100.00%
1
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fabian Frederick
38
100.00%
1
100.00%
Total
38
100.00%
1
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Fabian Frederick
38
100.00%
1
100.00%
Total
38
100.00%
1
100.00%


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,
};
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
1314
52.79%
13
25.00%
Linus Torvalds
582
23.38%
6
11.54%
Fabian Frederick
406
16.31%
9
17.31%
Nicholas Piggin
51
2.05%
2
3.85%
Al Viro
48
1.93%
9
17.31%
Miklos Szeredi
24
0.96%
2
3.85%
David Howells
23
0.92%
3
5.77%
Brian Gerst
14
0.56%
1
1.92%
Roman Zippel
8
0.32%
1
1.92%
Andrew Morton
8
0.32%
1
1.92%
Florin Malita
4
0.16%
1
1.92%
Geert Uytterhoeven
4
0.16%
1
1.92%
Trond Myklebust
2
0.08%
2
3.85%
Julia Lawall
1
0.04%
1
1.92%
Total
2489
100.00%
52
100.00%
Directory: fs/affs

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