/*
* 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 character and cleanup by
* OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
*/
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/msdos_fs.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include <linux/namei.h>
static int vfat_hashi(struct dentry *parent, struct qstr *qstr);
static int vfat_hash(struct dentry *parent, struct qstr *qstr);
static int vfat_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b);
static int vfat_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b);
static int vfat_revalidate(struct dentry *dentry, struct nameidata *nd);
static struct dentry_operations vfat_dentry_ops[4] = {
{
.d_hash = vfat_hashi,
.d_compare = vfat_cmpi,
},
{
.d_revalidate = vfat_revalidate,
.d_hash = vfat_hashi,
.d_compare = vfat_cmpi,
},
{
.d_hash = vfat_hash,
.d_compare = vfat_cmp,
},
{
.d_revalidate = vfat_revalidate,
.d_hash = vfat_hash,
.d_compare = vfat_cmp,
}
};
static int vfat_revalidate(struct dentry *dentry, struct nameidata *nd)
{
int ret = 1;
if (!dentry->d_inode &&
nd && !(nd->flags & LOOKUP_CONTINUE) && (nd->flags & LOOKUP_CREATE))
/*
* negative dentry is dropped, in order to make sure
* to use the name which a user desires if this is
* create path.
*/
ret = 0;
else {
spin_lock(&dentry->d_lock);
if (dentry->d_time != dentry->d_parent->d_inode->i_version)
ret = 0;
spin_unlock(&dentry->d_lock);
}
return ret;
}
static inline unsigned char
vfat_tolower(struct nls_table *t, unsigned char c)
{
unsigned char nc = t->charset2lower[c];
return nc ? nc : c;
}
static inline unsigned char
vfat_toupper(struct nls_table *t, unsigned char c)
{
unsigned char nc = t->charset2upper[c];
return nc ? nc : c;
}
static inline int
vfat_strnicmp(struct nls_table *t, const unsigned char *s1,
const unsigned char *s2, int len)
{
while(len--)
if (vfat_tolower(t, *s1++) != vfat_tolower(t, *s2++))
return 1;
return 0;
}
/* returns the length of a struct qstr, ignoring trailing dots */
static unsigned int vfat_striptail_len(struct qstr *qstr)
{
unsigned int len = qstr->len;
while (len && qstr->name[len-1] == '.')
len--;
return len;
}
/*
* 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(struct dentry *dentry, struct qstr *qstr)
{
qstr->hash = full_name_hash(qstr->name, vfat_striptail_len(qstr));
return 0;
}
/*
* 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(struct dentry *dentry, struct qstr *qstr)
{
struct nls_table *t = MSDOS_SB(dentry->d_inode->i_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();
while (len--)
hash = partial_name_hash(vfat_tolower(t, *name++), hash);
qstr->hash = end_name_hash(hash);
return 0;
}
/*
* Case insensitive compare of two vfat names.
*/
static int vfat_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b)
{
struct nls_table *t = MSDOS_SB(dentry->d_inode->i_sb)->nls_io;
unsigned int alen, blen;
/* A filename cannot end in '.' or we treat it like it has none */
alen = vfat_striptail_len(a);
blen = vfat_striptail_len(b);
if (alen == blen) {
if (vfat_strnicmp(t, a->name, b->name, alen) == 0)
return 0;
}
return 1;
}
/*
* Case sensitive compare of two vfat names.
*/
static int vfat_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b)
{
unsigned int alen, blen;
/* A filename cannot end in '.' or we treat it like it has none */
alen = vfat_striptail_len(a);
blen = vfat_striptail_len(b);
if (alen == blen) {
if (strncmp(a->name, b->name, alen) == 0)
return 0;
}
return 1;
}
/* Characters that are undesirable in an MS-DOS file name */
static wchar_t bad_chars[] = {
/* `*' `?' `<' `>' `|' `"' `:' `/' */
0x002A, 0x003F, 0x003C, 0x003E, 0x007C, 0x0022, 0x003A, 0x002F,
/* `\' */
0x005C, 0,
};
#define IS_BADCHAR(uni) (vfat_unistrchr(bad_chars, (uni)) != NULL)
static wchar_t replace_chars[] = {
/* `[' `]' `;' `,' `+' `=' */
0x005B, 0x005D, 0x003B, 0x002C, 0x002B, 0x003D, 0,
};
#define IS_REPLACECHAR(uni) (vfat_unistrchr(replace_chars, (uni)) != NULL)
static wchar_t skip_chars[] = {
/* `.' ` ' */
0x002E, 0x0020, 0,
};
#define IS_SKIPCHAR(uni) \
((wchar_t)(uni) == skip_chars[0] || (wchar_t)(uni) == skip_chars[1])
static inline wchar_t *vfat_unistrchr(const wchar_t *s, const wchar_t c)
{
for(; *s != c; ++s)
if (*s == 0)
return NULL;
return (wchar_t *) s;
}
static inline int vfat_is_used_badchars(const wchar_t *s, int len)
{
int i;
for (i = 0; i < len; i++)
if (s[i] < 0x0020 || IS_BADCHAR(s[i]))
return -EINVAL;
return 0;
}
static int vfat_valid_longname(const unsigned char *name, unsigned int len)
{
if (len && name[len-1] == ' ')
return 0;
if (len >= 256)
return 0;
/* MS-DOS "device special files" */
if (len == 3 || (len > 3 && name[3] == '.')) { /* basename == 3 */
if (!strnicmp(name, "aux", 3) ||
!strnicmp(name, "con", 3) ||
!strnicmp(name, "nul", 3) ||
!strnicmp(name, "prn", 3))
return 0;
}
if (len == 4 || (len > 4 && name[4] == '.')) { /* basename == 4 */
/* "com1", "com2", ... */
if ('1' <= name[3] && name[3] <= '9') {
if (!strnicmp(name, "com", 3) ||
!strnicmp(name, "lpt", 3))
return 0;
}
}
return 1;
}
static int vfat_find_form(struct inode *dir, unsigned char *name)
{
struct msdos_dir_entry *de;
struct buffer_head *bh = NULL;
loff_t i_pos;
int res;
res = fat_scan(dir, name, &bh, &de, &i_pos);
brelse(bh);
if (res < 0)
return -ENOENT;
return 0;
}
/*
* 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 unsigned char
shortname_info_to_lcase(struct shortname_info *base,
struct shortname_info *ext)
{
unsigned char lcase = 0;
if (base->valid && ext->valid) {
if (!base->upper && base->lower && (ext->lower || ext->upper))
lcase |= CASE_LOWER_BASE;
if (!ext->upper && ext->lower && (base->lower || base->upper))
lcase |= CASE_LOWER_EXT;
}
return lcase;
}
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 (IS_SKIPCHAR(*src)) {
info->valid = 0;
return 0;
}
if (IS_REPLACECHAR(*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] = vfat_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;
}
/*
* 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)
{
wchar_t *ip, *ext_start, *end, *name_start;
unsigned char base[9], ext[4], buf[8], *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;
unsigned short opt_shortname = MSDOS_SB(dir->i_sb)->options.shortname;
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 (!IS_SKIPCHAR(*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 (opt_shortname & VFAT_SFN_CREATE_WIN95) {
return (base_info.upper && ext_info.upper);
} else if (opt_shortname & VFAT_SFN_CREATE_WINNT) {
if ((base_info.upper || base_info.lower)
&& (ext_info.upper || ext_info.lower)) {
*lcase = shortname_info_to_lcase(&base_info,
&ext_info);
return 1;
}
return 0;
} else {
BUG();
}
}
if (MSDOS_SB(dir->i_sb)->options.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 & 0xffff;
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) {
sprintf(buf, "%04X", i);
memcpy(&name_res[baselen], buf, 4);
if (vfat_find_form(dir, name_res) < 0)
break;
i -= 11;
}
return 0;
}
/* 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) {
int name_len = strlen(name);
*outlen = utf8_mbstowcs((wchar_t *)outname, name, PAGE_SIZE);
/*
* We stripped '.'s before and set len appropriately,
* but utf8_mbstowcs doesn't care about len
*/
*outlen -= (name_len-len);
op = &outname[*outlen * sizeof(wchar_t)];
} else {
if (nls) {
for (i = 0, ip = name, op = outname, *outlen = 0;
i < len && *outlen <= 260; *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 {
if ((charlen = nls->char2uni(ip, len-i, (wchar_t *)op)) < 0)
return -EINVAL;
ip += charlen;
i += charlen;
op += 2;
}
}
} else {
for (i = 0, ip = name, op = outname, *outlen = 0;
i < len && *outlen <= 260; i++, *outlen += 1)
{
*op++ = *ip++;
*op++ = 0;
}
}
}
if (*outlen > 260)
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;
}
static int vfat_build_slots(struct inode *dir, const unsigned char *name,
int len, struct msdos_dir_slot *ds,
int *slots, int is_dir)
{
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 long page;
unsigned char cksum, lcase;
unsigned char msdos_name[MSDOS_NAME];
wchar_t *uname;
int res, slot, ulen, usize, i;
loff_t offset;
*slots = 0;
if (!vfat_valid_longname(name, len))
return -EINVAL;
if(!(page = __get_free_page(GFP_KERNEL)))
return -ENOMEM;
uname = (wchar_t *)page;
res = xlate_to_uni(name, len, (unsigned char *)uname, &ulen, &usize,
opts->unicode_xlate, opts->utf8, sbi->nls_io);
if (res < 0)
goto out_free;
res = vfat_is_used_badchars(uname, ulen);
if (res < 0)
goto out_free;
res = vfat_create_shortname(dir, sbi->nls_disk, uname, ulen,
msdos_name, &lcase);
if (res < 0)
goto out_free;
else if (res == 1) {
de = (struct msdos_dir_entry *)ds;
res = 0;
goto shortname;
}
/* build the entry of long file name */
*slots = usize / 13;
for (cksum = i = 0; i < 11; i++) {
cksum = (((cksum&1)<<7)|((cksum&0xfe)>>1)) + msdos_name[i];
}
for (ps = ds, slot = *slots; slot > 0; slot--, ps++) {
ps->id = slot;
ps->attr = ATTR_EXT;
ps->reserved = 0;
ps->alias_checksum = cksum;
ps->start = 0;
offset = (slot - 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);
}
ds[0].id |= 0x40;
de = (struct msdos_dir_entry *) ps;
shortname:
/* build the entry of 8.3 alias name */
(*slots)++;
memcpy(de->name, msdos_name, MSDOS_NAME);
de->attr = is_dir ? ATTR_DIR : ATTR_ARCH;
de->lcase = lcase;
de->adate = de->cdate = de->date = 0;
de->ctime_ms = de->ctime = de->time = 0;
de->start = 0;
de->starthi = 0;
de->size = 0;
out_free:
free_page(page);
return res;
}
static int vfat_add_entry(struct inode *dir,struct qstr* qname,
int is_dir, struct vfat_slot_info *sinfo_out,
struct buffer_head **bh, struct msdos_dir_entry **de)
{
struct msdos_dir_slot *dir_slots;
loff_t offset;
int res, slots, slot;
unsigned int len;
struct msdos_dir_entry *dummy_de;
struct buffer_head *dummy_bh;
loff_t dummy_i_pos;
len = vfat_striptail_len(qname);
if (len == 0)
return -ENOENT;
dir_slots =
kmalloc(sizeof(struct msdos_dir_slot) * MSDOS_SLOTS, GFP_KERNEL);
if (dir_slots == NULL)
return -ENOMEM;
res = vfat_build_slots(dir, qname->name, len,
dir_slots, &slots, is_dir);
if (res < 0)
goto cleanup;
/* build the empty directory entry of number of slots */
offset = fat_add_entries(dir, slots, &dummy_bh, &dummy_de, &dummy_i_pos);
if (offset < 0) {
res = offset;
goto cleanup;
}
brelse(dummy_bh);
/* Now create the new entry */
*bh = NULL;
for (slot = 0; slot < slots; slot++) {
if (fat_get_entry(dir, &offset, bh, de, &sinfo_out->i_pos) < 0) {
res = -EIO;
goto cleanup;
}
memcpy(*de, dir_slots + slot, sizeof(struct msdos_dir_slot));
mark_buffer_dirty(*bh);
}
res = 0;
/* update timestamp */
dir->i_ctime = dir->i_mtime = dir->i_atime = CURRENT_TIME;
mark_inode_dirty(dir);
fat_date_unix2dos(dir->i_mtime.tv_sec, &(*de)->time, &(*de)->date);
(*de)->ctime = (*de)->time;
(*de)->adate = (*de)->cdate = (*de)->date;
mark_buffer_dirty(*bh);
/* slots can't be less than 1 */
sinfo_out->long_slots = slots - 1;
sinfo_out->longname_offset =
offset - sizeof(struct msdos_dir_slot) * slots;
cleanup:
kfree(dir_slots);
return res;
}
static int vfat_find(struct inode *dir,struct qstr* qname,
struct vfat_slot_info *sinfo, struct buffer_head **last_bh,
struct msdos_dir_entry **last_de)
{
struct super_block *sb = dir->i_sb;
loff_t offset;
unsigned int len;
int res;
len = vfat_striptail_len(qname);
if (len == 0)
return -ENOENT;
res = fat_search_long(dir, qname->name, len,
(MSDOS_SB(sb)->options.name_check != 's'),
&offset, &sinfo->longname_offset);
if (res>0) {
sinfo->long_slots = res-1;
if (fat_get_entry(dir,&offset,last_bh,last_de,&sinfo->i_pos)>=0)
return 0;
res = -EIO;
}
return res ? res : -ENOENT;
}
struct dentry *vfat_lookup(struct inode *dir,struct dentry *dentry, struct nameidata *nd)
{
int res;
struct vfat_slot_info sinfo;
struct inode *inode;
struct dentry *alias;
struct buffer_head *bh = NULL;
struct msdos_dir_entry *de;
int table;
lock_kernel();
table = (MSDOS_SB(dir->i_sb)->options.name_check == 's') ? 2 : 0;
dentry->d_op = &vfat_dentry_ops[table];
inode = NULL;
res = vfat_find(dir,&dentry->d_name,&sinfo,&bh,&de);
if (res < 0) {
table++;
goto error;
}
inode = fat_build_inode(dir->i_sb, de, sinfo.i_pos, &res);
brelse(bh);
if (res) {
unlock_kernel();
return ERR_PTR(res);
}
alias = d_find_alias(inode);
if (alias) {
if (d_invalidate(alias)==0)
dput(alias);
else {
iput(inode);
unlock_kernel();
return alias;
}
}
error:
unlock_kernel();
dentry->d_op = &vfat_dentry_ops[table];
dentry->d_time = dentry->d_parent->d_inode->i_version;
dentry = d_splice_alias(inode, dentry);
if (dentry) {
dentry->d_op = &vfat_dentry_ops[table];
dentry->d_time = dentry->d_parent->d_inode->i_version;
}
return dentry;
}
int vfat_create(struct inode *dir,struct dentry* dentry,int mode,
struct nameidata *nd)
{
struct super_block *sb = dir->i_sb;
struct inode *inode = NULL;
struct buffer_head *bh = NULL;
struct msdos_dir_entry *de;
struct vfat_slot_info sinfo;
int res;
lock_kernel();
res = vfat_add_entry(dir, &dentry->d_name, 0, &sinfo, &bh, &de);
if (res < 0) {
unlock_kernel();
return res;
}
inode = fat_build_inode(sb, de, sinfo.i_pos, &res);
brelse(bh);
if (!inode) {
unlock_kernel();
return res;
}
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(inode);
inode->i_version++;
dir->i_version++;
dentry->d_time = dentry->d_parent->d_inode->i_version;
d_instantiate(dentry,inode);
unlock_kernel();
return 0;
}
static void vfat_remove_entry(struct inode *dir,struct vfat_slot_info *sinfo,
struct buffer_head *bh, struct msdos_dir_entry *de)
{
loff_t offset, i_pos;
int i;
/* remove the shortname */
dir->i_mtime = dir->i_atime = CURRENT_TIME;
dir->i_version++;
mark_inode_dirty(dir);
de->name[0] = DELETED_FLAG;
mark_buffer_dirty(bh);
/* remove the longname */
offset = sinfo->longname_offset; de = NULL;
for (i = sinfo->long_slots; i > 0; --i) {
if (fat_get_entry(dir, &offset, &bh, &de, &i_pos) < 0)
continue;
de->name[0] = DELETED_FLAG;
de->attr = ATTR_NONE;
mark_buffer_dirty(bh);
}
brelse(bh);
}
int vfat_rmdir(struct inode *dir,struct dentry* dentry)
{
int res;
struct vfat_slot_info sinfo;
struct buffer_head *bh = NULL;
struct msdos_dir_entry *de;
lock_kernel();
res = fat_dir_empty(dentry->d_inode);
if (res) {
unlock_kernel();
return res;
}
res = vfat_find(dir,&dentry->d_name,&sinfo, &bh, &de);
if (res<0) {
unlock_kernel();
return res;
}
dentry->d_inode->i_nlink = 0;
dentry->d_inode->i_mtime = dentry->d_inode->i_atime = CURRENT_TIME;
fat_detach(dentry->d_inode);
mark_inode_dirty(dentry->d_inode);
/* releases bh */
vfat_remove_entry(dir,&sinfo,bh,de);
dir->i_nlink--;
unlock_kernel();
return 0;
}
int vfat_unlink(struct inode *dir, struct dentry* dentry)
{
int res;
struct vfat_slot_info sinfo;
struct buffer_head *bh = NULL;
struct msdos_dir_entry *de;
lock_kernel();
res = vfat_find(dir,&dentry->d_name,&sinfo,&bh,&de);
if (res < 0) {
unlock_kernel();
return res;
}
dentry->d_inode->i_nlink = 0;
dentry->d_inode->i_mtime = dentry->d_inode->i_atime = CURRENT_TIME;
fat_detach(dentry->d_inode);
mark_inode_dirty(dentry->d_inode);
/* releases bh */
vfat_remove_entry(dir,&sinfo,bh,de);
unlock_kernel();
return res;
}
int vfat_mkdir(struct inode *dir,struct dentry* dentry,int mode)
{
struct super_block *sb = dir->i_sb;
struct inode *inode = NULL;
struct vfat_slot_info sinfo;
struct buffer_head *bh = NULL;
struct msdos_dir_entry *de;
int res;
lock_kernel();
res = vfat_add_entry(dir, &dentry->d_name, 1, &sinfo, &bh, &de);
if (res < 0) {
unlock_kernel();
return res;
}
inode = fat_build_inode(sb, de, sinfo.i_pos, &res);
if (!inode)
goto out;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(inode);
inode->i_version++;
dir->i_version++;
dir->i_nlink++;
inode->i_nlink = 2; /* no need to mark them dirty */
res = fat_new_dir(inode, dir, 1);
if (res < 0)
goto mkdir_failed;
dentry->d_time = dentry->d_parent->d_inode->i_version;
d_instantiate(dentry,inode);
out:
brelse(bh);
unlock_kernel();
return res;
mkdir_failed:
inode->i_nlink = 0;
inode->i_mtime = inode->i_atime = CURRENT_TIME;
fat_detach(inode);
mark_inode_dirty(inode);
/* releases bh */
vfat_remove_entry(dir,&sinfo,bh,de);
iput(inode);
dir->i_nlink--;
unlock_kernel();
return res;
}
int vfat_rename(struct inode *old_dir,struct dentry *old_dentry,
struct inode *new_dir,struct dentry *new_dentry)
{
struct buffer_head *old_bh,*new_bh,*dotdot_bh;
struct msdos_dir_entry *old_de,*new_de,*dotdot_de;
loff_t dotdot_i_pos;
struct inode *old_inode, *new_inode;
int res, is_dir;
struct vfat_slot_info old_sinfo,sinfo;
old_bh = new_bh = dotdot_bh = NULL;
old_inode = old_dentry->d_inode;
new_inode = new_dentry->d_inode;
lock_kernel();
res = vfat_find(old_dir,&old_dentry->d_name,&old_sinfo,&old_bh,&old_de);
if (res < 0)
goto rename_done;
is_dir = S_ISDIR(old_inode->i_mode);
if (is_dir) {
if (fat_scan(old_inode, MSDOS_DOTDOT, &dotdot_bh,
&dotdot_de, &dotdot_i_pos) < 0) {
res = -EIO;
goto rename_done;
}
}
if (new_dentry->d_inode) {
res = vfat_find(new_dir,&new_dentry->d_name,&sinfo,&new_bh,
&new_de);
if (res < 0 || MSDOS_I(new_inode)->i_pos != sinfo.i_pos) {
/* WTF??? Cry and fail. */
printk(KERN_WARNING "vfat_rename: fs corrupted\n");
goto rename_done;
}
if (is_dir) {
res = fat_dir_empty(new_inode);
if (res)
goto rename_done;
}
fat_detach(new_inode);
} else {
res = vfat_add_entry(new_dir,&new_dentry->d_name,is_dir,&sinfo,
&new_bh,&new_de);
if (res < 0) goto rename_done;
}
new_dir->i_version++;
/* releases old_bh */
vfat_remove_entry(old_dir,&old_sinfo,old_bh,old_de);
old_bh=NULL;
fat_detach(old_inode);
fat_attach(old_inode, sinfo.i_pos);
mark_inode_dirty(old_inode);
old_dir->i_version++;
old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(old_dir);
if (new_inode) {
new_inode->i_nlink--;
new_inode->i_ctime=CURRENT_TIME;
}
if (is_dir) {
int start = MSDOS_I(new_dir)->i_logstart;
dotdot_de->start = CT_LE_W(start);
dotdot_de->starthi = CT_LE_W(start>>16);
mark_buffer_dirty(dotdot_bh);
old_dir->i_nlink--;
if (new_inode) {
new_inode->i_nlink--;
} else {
new_dir->i_nlink++;
mark_inode_dirty(new_dir);
}
}
rename_done:
brelse(dotdot_bh);
brelse(old_bh);
brelse(new_bh);
unlock_kernel();
return res;
}
/* Public inode operations for the VFAT fs */
struct inode_operations vfat_dir_inode_operations = {
.create = vfat_create,
.lookup = vfat_lookup,
.unlink = vfat_unlink,
.mkdir = vfat_mkdir,
.rmdir = vfat_rmdir,
.rename = vfat_rename,
.setattr = fat_notify_change,
};
int vfat_fill_super(struct super_block *sb, void *data, int silent)
{
int res;
res = fat_fill_super(sb, data, silent, &vfat_dir_inode_operations, 1);
if (res)
return res;
if (MSDOS_SB(sb)->options.name_check != 's')
sb->s_root->d_op = &vfat_dentry_ops[0];
else
sb->s_root->d_op = &vfat_dentry_ops[2];
return 0;
}
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