Release 4.10 fs/fat/namei_vfat.c

/*
 *  linux/fs/vfat/namei.c
 *
 *  Written 1992,1993 by Werner Almesberger
 *
 *  Windows95/Windows NT compatible extended MSDOS filesystem
 *    by Gordon Chaffee Copyright (C) 1995.  Send bug reports for the
 *    VFAT filesystem to <chaffee@cs.berkeley.edu>.  Specify
 *    what file operation caused you trouble and if you can duplicate
 *    the problem, send a script that demonstrates it.
 *
 *  Short name translation 1999, 2001 by Wolfram Pienkoss <wp@bszh.de>
 *
 *  Support Multibyte characters and cleanup by
 *                              OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
 */

#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/namei.h>
#include "fat.h"



static inline unsigned long vfat_d_version(struct dentry *dentry)
{
	return (unsigned long) dentry->d_fsdata;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
miklos szeredi
miklos szeredi
22
100.00%
1
100.00%
Total
22
100.00%
1
100.00%



static inline void vfat_d_version_set(struct dentry *dentry,
				      unsigned long version)
{
	dentry->d_fsdata = (void *) version;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
miklos szeredi
miklos szeredi
26
100.00%
1
100.00%
Total
26
100.00%
1
100.00%

/*
 * If new entry was created in the parent, it could create the 8.3
 * alias (the shortname of logname).  So, the parent may have the
 * negative-dentry which matches the created 8.3 alias.
 *
 * If it happened, the negative dentry isn't actually negative
 * anymore.  So, drop it.
 */


static int vfat_revalidate_shortname(struct dentry *dentry)
{
	int ret = 1;
	spin_lock(&dentry->d_lock);
	if (vfat_d_version(dentry) != d_inode(dentry->d_parent)->i_version)
		ret = 0;
	spin_unlock(&dentry->d_lock);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
25
45.45%
2
25.00%
hirofumi ogawa
hirofumi ogawa
24
43.64%
4
50.00%
miklos szeredi
miklos szeredi
3
5.45%
1
12.50%
david howells
david howells
3
5.45%
1
12.50%
Total
55
100.00%
8
100.00%



static int vfat_revalidate(struct dentry *dentry, unsigned int flags)
{
	if (flags & LOOKUP_RCU)
		return -ECHILD;

	/* This is not negative dentry. Always valid. */
	if (d_really_is_positive(dentry))
		return 1;
	return vfat_revalidate_shortname(dentry);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
hirofumi ogawa
hirofumi ogawa
26
61.90%
1
25.00%
nick piggin
nick piggin
10
23.81%
1
25.00%
al viro
al viro
3
7.14%
1
25.00%
david howells
david howells
3
7.14%
1
25.00%
Total
42
100.00%
4
100.00%



static int vfat_revalidate_ci(struct dentry *dentry, unsigned int flags)
{
	if (flags & LOOKUP_RCU)
		return -ECHILD;

	/*
         * This is not negative dentry. Always valid.
         *
         * Note, rename() to existing directory entry will have ->d_inode,
         * and will use existing name which isn't specified name by user.
         *
         * We may be able to drop this positive dentry here. But dropping
         * positive dentry isn't good idea. So it's unsupported like
         * rename("filename", "FILENAME") for now.
         */
	if (d_really_is_positive(dentry))
		return 1;

	/*
         * This may be nfsd (or something), anyway, we can't see the
         * intent of this. So, since this can be for creation, drop it.
         */
	if (!flags)
		return 0;

	/*
         * Drop the negative dentry, in order to make sure to use the
         * case sensitive name which is specified by user if this is
         * for creation.
         */
	if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
		return 0;

	return vfat_revalidate_shortname(dentry);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
hirofumi ogawa
hirofumi ogawa
48
73.85%
2
40.00%
nick piggin
nick piggin
10
15.38%
1
20.00%
al viro
al viro
4
6.15%
1
20.00%
david howells
david howells
3
4.62%
1
20.00%
Total
65
100.00%
5
100.00%

/* returns the length of a struct qstr, ignoring trailing dots */


static unsigned int __vfat_striptail_len(unsigned int len, const char *name)
{
	while (len && name[len - 1] == '.')
		len--;
	return len;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
21
60.00%
2
40.00%
nick piggin
nick piggin
8
22.86%
1
20.00%
hirofumi ogawa
hirofumi ogawa
6
17.14%
2
40.00%
Total
35
100.00%
5
100.00%



static unsigned int vfat_striptail_len(const struct qstr *qstr)
{
	return __vfat_striptail_len(qstr->len, qstr->name);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
nick piggin
nick piggin
25
100.00%
1
100.00%
Total
25
100.00%
1
100.00%

/*
 * Compute the hash for the vfat name corresponding to the dentry.
 * Note: if the name is invalid, we leave the hash code unchanged so
 * that the existing dentry can be used. The vfat fs routines will
 * return ENOENT or EINVAL as appropriate.
 */


static int vfat_hash(const struct dentry *dentry, struct qstr *qstr)
{
	qstr->hash = full_name_hash(dentry, qstr->name, vfat_striptail_len(qstr));
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
hirofumi ogawa
hirofumi ogawa
21
55.26%
1
25.00%
pre-git
pre-git
14
36.84%
1
25.00%
linus torvalds
linus torvalds
2
5.26%
1
25.00%
nick piggin
nick piggin
1
2.63%
1
25.00%
Total
38
100.00%
4
100.00%

/*
 * Compute the hash for the vfat name corresponding to the dentry.
 * Note: if the name is invalid, we leave the hash code unchanged so
 * that the existing dentry can be used. The vfat fs routines will
 * return ENOENT or EINVAL as appropriate.
 */


static int vfat_hashi(const struct dentry *dentry, struct qstr *qstr)
{
	struct nls_table *t = MSDOS_SB(dentry->d_sb)->nls_io;
	const unsigned char *name;
	unsigned int len;
	unsigned long hash;

	name = qstr->name;
	len = vfat_striptail_len(qstr);

	hash = init_name_hash(dentry);
	while (len--)
		hash = partial_name_hash(nls_tolower(t, *name++), hash);
	qstr->hash = end_name_hash(hash);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
85
86.73%
4
44.44%
hirofumi ogawa
hirofumi ogawa
7
7.14%
2
22.22%
linus torvalds
linus torvalds
3
3.06%
1
11.11%
nick piggin
nick piggin
2
2.04%
1
11.11%
christoph hellwig
christoph hellwig
1
1.02%
1
11.11%
Total
98
100.00%
9
100.00%

/*
 * Case insensitive compare of two vfat names.
 */


static int vfat_cmpi(const struct dentry *dentry,
		unsigned int len, const char *str, const struct qstr *name)
{
	struct nls_table *t = MSDOS_SB(dentry->d_sb)->nls_io;
	unsigned int alen, blen;

	/* A filename cannot end in '.' or we treat it like it has none */
	alen = vfat_striptail_len(name);
	blen = __vfat_striptail_len(len, str);
	if (alen == blen) {
		if (nls_strnicmp(t, name->name, str, alen) == 0)
			return 0;
	}
	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
66
69.47%
3
42.86%
nick piggin
nick piggin
21
22.11%
1
14.29%
hirofumi ogawa
hirofumi ogawa
6
6.32%
1
14.29%
al viro
al viro
1
1.05%
1
14.29%
christoph hellwig
christoph hellwig
1
1.05%
1
14.29%
Total
95
100.00%
7
100.00%

/*
 * Case sensitive compare of two vfat names.
 */


static int vfat_cmp(const struct dentry *dentry,
		unsigned int len, const char *str, const struct qstr *name)
{
	unsigned int alen, blen;

	/* A filename cannot end in '.' or we treat it like it has none */
	alen = vfat_striptail_len(name);
	blen = __vfat_striptail_len(len, str);
	if (alen == blen) {
		if (strncmp(name->name, str, alen) == 0)
			return 0;
	}
	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
52
65.82%
3
60.00%
nick piggin
nick piggin
21
26.58%
1
20.00%
hirofumi ogawa
hirofumi ogawa
6
7.59%
1
20.00%
Total
79
100.00%
5
100.00%


static const struct dentry_operations vfat_ci_dentry_ops = {
	.d_revalidate	= vfat_revalidate_ci,
	.d_hash		= vfat_hashi,
	.d_compare	= vfat_cmpi,
};


static const struct dentry_operations vfat_dentry_ops = {
	.d_revalidate	= vfat_revalidate,
	.d_hash		= vfat_hash,
	.d_compare	= vfat_cmp,
};

/* Characters that are undesirable in an MS-DOS file name */



static inline wchar_t vfat_bad_char(wchar_t w)
{
	return (w < 0x0020)
	    || (w == '*') || (w == '?') || (w == '<') || (w == '>')
	    || (w == '|') || (w == '"') || (w == ':') || (w == '/')
	    || (w == '\\');
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
hirofumi ogawa
hirofumi ogawa
64
90.14%
1
25.00%
linus torvalds
linus torvalds
6
8.45%
2
50.00%
pre-git
pre-git
1
1.41%
1
25.00%
Total
71
100.00%
4
100.00%



static inline wchar_t vfat_replace_char(wchar_t w)
{
	return (w == '[') || (w == ']') || (w == ';') || (w == ',')
	    || (w == '+') || (w == '=');
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
hirofumi ogawa
hirofumi ogawa
38
80.85%
1
33.33%
linus torvalds
linus torvalds
5
10.64%
1
33.33%
pre-git
pre-git
4
8.51%
1
33.33%
Total
47
100.00%
3
100.00%



static wchar_t vfat_skip_char(wchar_t w)
{
	return (w == '.') || (w == ' ');
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
hirofumi ogawa
hirofumi ogawa
17
77.27%
1
50.00%
linus torvalds
linus torvalds
5
22.73%
1
50.00%
Total
22
100.00%
2
100.00%



static inline int vfat_is_used_badchars(const wchar_t *s, int len)
{
	int i;

	for (i = 0; i < len; i++)
		if (vfat_bad_char(s[i]))
			return -EINVAL;

	if (s[i - 1] == ' ') /* last character cannot be space */
		return -EINVAL;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
linus torvalds
linus torvalds
43
67.19%
1
20.00%
pre-git
pre-git
14
21.88%
1
20.00%
hirofumi ogawa
hirofumi ogawa
4
6.25%
2
40.00%
keith mok
keith mok
3
4.69%
1
20.00%
Total
64
100.00%
5
100.00%



static int vfat_find_form(struct inode *dir, unsigned char *name)
{
	struct fat_slot_info sinfo;
	int err = fat_scan(dir, name, &sinfo);
	if (err)
		return -ENOENT;
	brelse(sinfo.bh);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
21
41.18%
3
42.86%
hirofumi ogawa
hirofumi ogawa
16
31.37%
3
42.86%
linus torvalds
linus torvalds
14
27.45%
1
14.29%
Total
51
100.00%
7
100.00%

/*
 * 1) Valid characters for the 8.3 format alias are any combination of
 * letters, uppercase alphabets, digits, any of the
 * following special characters:
 *     $ % ' ` - @ { } ~ ! # ( ) & _ ^
 * In this case Longfilename is not stored in disk.
 *
 * WinNT's Extension:
 * File name and extension name is contain uppercase/lowercase
 * only. And it is expressed by CASE_LOWER_BASE and CASE_LOWER_EXT.
 *
 * 2) File name is 8.3 format, but it contain the uppercase and
 * lowercase char, muliti bytes char, etc. In this case numtail is not
 * added, but Longfilename is stored.
 *
 * 3) When the one except for the above, or the following special
 * character are contained:
 *        .   [ ] ; , + =
 * numtail is added, and Longfilename must be stored in disk .
 */

struct shortname_info {
	
unsigned char lower:1,
		      
upper:1,
		      
valid:1;
};

#define INIT_SHORTNAME_INFO(x)	do {            \
        (x)->lower = 1;                         \
        (x)->upper = 1;                         \
        (x)->valid = 1;                         \
} while (0)



static inline int to_shortname_char(struct nls_table *nls,
				    unsigned char *buf, int buf_size,
				    wchar_t *src, struct shortname_info *info)
{
	int len;

	if (vfat_skip_char(*src)) {
		info->valid = 0;
		return 0;
	}
	if (vfat_replace_char(*src)) {
		info->valid = 0;
		buf[0] = '_';
		return 1;
	}

	len = nls->uni2char(*src, buf, buf_size);
	if (len <= 0) {
		info->valid = 0;
		buf[0] = '_';
		len = 1;
	} else if (len == 1) {
		unsigned char prev = buf[0];

		if (buf[0] >= 0x7F) {
			info->lower = 0;
			info->upper = 0;
		}

		buf[0] = nls_toupper(nls, buf[0]);
		if (isalpha(buf[0])) {
			if (buf[0] == prev)
				info->lower = 0;
			else
				info->upper = 0;
		}
	} else {
		info->lower = 0;
		info->upper = 0;
	}

	return len;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
linus torvalds
linus torvalds
221
98.66%
2
50.00%
hirofumi ogawa
hirofumi ogawa
2
0.89%
1
25.00%
christoph hellwig
christoph hellwig
1
0.45%
1
25.00%
Total
224
100.00%
4
100.00%

/*
 * Given a valid longname, create a unique shortname.  Make sure the
 * shortname does not exist
 * Returns negative number on error, 0 for a normal
 * return, and 1 for valid shortname
 */


static int vfat_create_shortname(struct inode *dir, struct nls_table *nls,
				 wchar_t *uname, int ulen,
				 unsigned char *name_res, unsigned char *lcase)
{
	struct fat_mount_options *opts = &MSDOS_SB(dir->i_sb)->options;
	wchar_t *ip, *ext_start, *end, *name_start;
	unsigned char base[9], ext[4], buf[5], *p;
	unsigned char charbuf[NLS_MAX_CHARSET_SIZE];
	int chl, chi;
	int sz = 0, extlen, baselen, i, numtail_baselen, numtail2_baselen;
	int is_shortname;
	struct shortname_info base_info, ext_info;

	is_shortname = 1;
	INIT_SHORTNAME_INFO(&base_info);
	INIT_SHORTNAME_INFO(&ext_info);

	/* Now, we need to create a shortname from the long name */
	ext_start = end = &uname[ulen];
	while (--ext_start >= uname) {
		if (*ext_start == 0x002E) {	/* is `.' */
			if (ext_start == end - 1) {
				sz = ulen;
				ext_start = NULL;
			}
			break;
		}
	}

	if (ext_start == uname - 1) {
		sz = ulen;
		ext_start = NULL;
	} else if (ext_start) {
		/*
                 * Names which start with a dot could be just
                 * an extension eg. "...test".  In this case Win95
                 * uses the extension as the name and sets no extension.
                 */
		name_start = &uname[0];
		while (name_start < ext_start) {
			if (!vfat_skip_char(*name_start))
				break;
			name_start++;
		}
		if (name_start != ext_start) {
			sz = ext_start - uname;
			ext_start++;
		} else {
			sz = ulen;
			ext_start = NULL;
		}
	}

	numtail_baselen = 6;
	numtail2_baselen = 2;
	for (baselen = i = 0, p = base, ip = uname; i < sz; i++, ip++) {
		chl = to_shortname_char(nls, charbuf, sizeof(charbuf),
					ip, &base_info);
		if (chl == 0)
			continue;

		if (baselen < 2 && (baselen + chl) > 2)
			numtail2_baselen = baselen;
		if (baselen < 6 && (baselen + chl) > 6)
			numtail_baselen = baselen;
		for (chi = 0; chi < chl; chi++) {
			*p++ = charbuf[chi];
			baselen++;
			if (baselen >= 8)
				break;
		}
		if (baselen >= 8) {
			if ((chi < chl - 1) || (ip + 1) - uname < sz)
				is_shortname = 0;
			break;
		}
	}
	if (baselen == 0) {
		return -EINVAL;
	}

	extlen = 0;
	if (ext_start) {
		for (p = ext, ip = ext_start; extlen < 3 && ip < end; ip++) {
			chl = to_shortname_char(nls, charbuf, sizeof(charbuf),
						ip, &ext_info);
			if (chl == 0)
				continue;

			if ((extlen + chl) > 3) {
				is_shortname = 0;
				break;
			}
			for (chi = 0; chi < chl; chi++) {
				*p++ = charbuf[chi];
				extlen++;
			}
			if (extlen >= 3) {
				if (ip + 1 != end)
					is_shortname = 0;
				break;
			}
		}
	}
	ext[extlen] = '\0';
	base[baselen] = '\0';

	/* Yes, it can happen. ".\xe5" would do it. */
	if (base[0] == DELETED_FLAG)
		base[0] = 0x05;

	/* OK, at this point we know that base is not longer than 8 symbols,
         * ext is not longer than 3, base is nonempty, both don't contain
         * any bad symbols (lowercase transformed to uppercase).
         */

	memset(name_res, ' ', MSDOS_NAME);
	memcpy(name_res, base, baselen);
	memcpy(name_res + 8, ext, extlen);
	*lcase = 0;
	if (is_shortname && base_info.valid && ext_info.valid) {
		if (vfat_find_form(dir, name_res) == 0)
			return -EEXIST;

		if (opts->shortname & VFAT_SFN_CREATE_WIN95) {
			return (base_info.upper && ext_info.upper);
		} else if (opts->shortname & VFAT_SFN_CREATE_WINNT) {
			if ((base_info.upper || base_info.lower) &&
			    (ext_info.upper || ext_info.lower)) {
				if (!base_info.upper && base_info.lower)
					*lcase |= CASE_LOWER_BASE;
				if (!ext_info.upper && ext_info.lower)
					*lcase |= CASE_LOWER_EXT;
				return 1;
			}
			return 0;
		} else {
			BUG();
		}
	}

	if (opts->numtail == 0)
		if (vfat_find_form(dir, name_res) < 0)
			return 0;

	/*
         * Try to find a unique extension.  This used to
         * iterate through all possibilities sequentially,
         * but that gave extremely bad performance.  Windows
         * only tries a few cases before using random
         * values for part of the base.
         */

	if (baselen > 6) {
		baselen = numtail_baselen;
		name_res[7] = ' ';
	}
	name_res[baselen] = '~';
	for (i = 1; i < 10; i++) {
		name_res[baselen + 1] = i + '0';
		if (vfat_find_form(dir, name_res) < 0)
			return 0;
	}

	i = jiffies;
	sz = (jiffies >> 16) & 0x7;
	if (baselen > 2) {
		baselen = numtail2_baselen;
		name_res[7] = ' ';
	}
	name_res[baselen + 4] = '~';
	name_res[baselen + 5] = '1' + sz;
	while (1) {
		snprintf(buf, sizeof(buf), "%04X", i & 0xffff);
		memcpy(&name_res[baselen], buf, 4);
		if (vfat_find_form(dir, name_res) < 0)
			break;
		i -= 11;
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
463
48.38%
7
50.00%
linus torvalds
linus torvalds
433
45.25%
2
14.29%
hirofumi ogawa
hirofumi ogawa
52
5.43%
4
28.57%
nikolaus schulz
nikolaus schulz
9
0.94%
1
7.14%
Total
957
100.00%
14
100.00%

/* Translate a string, including coded sequences into Unicode */

static int

xlate_to_uni(const unsigned char *name, int len, unsigned char *outname,
	     int *longlen, int *outlen, int escape, int utf8,
	     struct nls_table *nls)
{
	const unsigned char *ip;
	unsigned char nc;
	unsigned char *op;
	unsigned int ec;
	int i, k, fill;
	int charlen;

	if (utf8) {
		*outlen = utf8s_to_utf16s(name, len, UTF16_HOST_ENDIAN,
				(wchar_t *) outname, FAT_LFN_LEN + 2);
		if (*outlen < 0)
			return *outlen;
		else if (*outlen > FAT_LFN_LEN)
			return -ENAMETOOLONG;

		op = &outname[*outlen * sizeof(wchar_t)];
	} else {
		for (i = 0, ip = name, op = outname, *outlen = 0;
			 i < len && *outlen < FAT_LFN_LEN;
			 *outlen += 1) {
			if (escape && (*ip == ':')) {
				if (i > len - 5)
					return -EINVAL;
				ec = 0;
				for (k = 1; k < 5; k++) {
					nc = ip[k];
					ec <<= 4;
					if (nc >= '0' && nc <= '9') {
						ec |= nc - '0';
						continue;
					}
					if (nc >= 'a' && nc <= 'f') {
						ec |= nc - ('a' - 10);
						continue;
					}
					if (nc >= 'A' && nc <= 'F') {
						ec |= nc - ('A' - 10);
						continue;
					}
					return -EINVAL;
				}
				*op++ = ec & 0xFF;
				*op++ = ec >> 8;
				ip += 5;
				i += 5;
			} else {
				charlen = nls->char2uni(ip, len - i,
									(wchar_t *)op);
				if (charlen < 0)
					return -EINVAL;
				ip += charlen;
				i += charlen;
				op += 2;
			}
		}
		if (i < len)
			return -ENAMETOOLONG;
	}

	*longlen = *outlen;
	if (*outlen % 13) {
		*op++ = 0;
		*op++ = 0;
		*outlen += 1;
		if (*outlen % 13) {
			fill = 13 - (*outlen % 13);
			for (i = 0; i < fill; i++) {
				*op++ = 0xff;
				*op++ = 0xff;
			}
			*outlen += fill;
		}
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
407
88.48%
6
42.86%
keith mok
keith mok
20
4.35%
1
7.14%
hirofumi ogawa
hirofumi ogawa
16
3.48%
2
14.29%
alan stern
alan stern
10
2.17%
2
14.29%
namjae jeon
namjae jeon
5
1.09%
2
14.29%
kevin dankwardt
kevin dankwardt
2
0.43%
1
7.14%
Total
460
100.00%
14
100.00%



static int vfat_build_slots(struct inode *dir, const unsigned char *name,
			    int len, int is_dir, int cluster,
			    struct timespec *ts,
			    struct msdos_dir_slot *slots, int *nr_slots)
{
	struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
	struct fat_mount_options *opts = &sbi->options;
	struct msdos_dir_slot *ps;
	struct msdos_dir_entry *de;
	unsigned char cksum, lcase;
	unsigned char msdos_name[MSDOS_NAME];
	wchar_t *uname;
	__le16 time, date;
	u8 time_cs;
	int err, ulen, usize, i;
	loff_t offset;

	*nr_slots = 0;

	uname = __getname();
	if (!uname)
		return -ENOMEM;

	err = xlate_to_uni(name, len, (unsigned char *)uname, &ulen, &usize,
			   opts->unicode_xlate, opts->utf8, sbi->nls_io);
	if (err)
		goto out_free;

	err = vfat_is_used_badchars(uname, ulen);
	if (err)
		goto out_free;

	err = vfat_create_shortname(dir, sbi->nls_disk, uname, ulen,
				    msdos_name, &lcase);
	if (err < 0)
		goto out_free;
	else if (err == 1) {
		de = (struct msdos_dir_entry *)slots;
		err = 0;
		goto shortname;
	}

	/* build the entry of long file name */
	cksum = fat_checksum(msdos_name);

	*nr_slots = usize / 13;
	for (ps = slots, i = *nr_slots; i > 0; i--, ps++) {
		ps->id = i;
		ps->attr = ATTR_EXT;
		ps->reserved = 0;
		ps->alias_checksum = cksum;
		ps->start = 0;
		offset = (i - 1) * 13;
		fatwchar_to16(ps->name0_4, uname + offset, 5);
		fatwchar_to16(ps->name5_10, uname + offset + 5, 6);
		fatwchar_to16(ps->name11_12, uname + offset + 11, 2);
	}
	slots[0].id |= 0x40;
	de = (struct msdos_dir_entry *)ps;

shortname:
	/* build the entry of 8.3 alias name */
	(*nr_slots)++;
	memcpy(de->name, msdos_name, MSDOS_NAME);
	de->attr = is_dir ? ATTR_DIR : ATTR_ARCH;
	de->lcase = lcase;
	fat_time_unix2fat(sbi, ts, &time, &date, &time_cs);
	de->time = de->ctime = time;
	de->date = de->cdate = de->adate = date;
	de->ctime_cs = time_cs;
	fat_set_start(de, cluster);
	de->size = 0;
out_free:
	__putname(uname);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
243
50.31%
5
26.32%
hirofumi ogawa
hirofumi ogawa
133
27.54%
9
47.37%
linus torvalds
linus torvalds
103
21.33%
2
10.53%
steven j. magnani
steven j. magnani
2
0.41%
1
5.26%
joe peterson
joe peterson
1
0.21%
1
5.26%
al viro
al viro
1
0.21%
1
5.26%
Total
483
100.00%
19
100.00%



static int vfat_add_entry(struct inode *dir, const struct qstr *qname,
			  int is_dir, int cluster, struct timespec *ts,
			  struct fat_slot_info *sinfo)
{
	struct msdos_dir_slot *slots;
	unsigned int len;
	int err, nr_slots;

	len = vfat_striptail_len(qname);
	if (len == 0)
		return