namei.c
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上传日期:2013-02-24
资源大小:30529k
文件大小:30k
- /*
- * 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/sched.h>
- #include <linux/msdos_fs.h>
- #include <linux/nls.h>
- #include <linux/kernel.h>
- #include <linux/errno.h>
- #include <linux/string.h>
- #include <linux/ctype.h>
- #include <linux/stat.h>
- #include <linux/mm.h>
- #include <linux/slab.h>
- #define DEBUG_LEVEL 0
- #if (DEBUG_LEVEL >= 1)
- # define PRINTK1(x) printk x
- #else
- # define PRINTK1(x)
- #endif
- #if (DEBUG_LEVEL >= 2)
- # define PRINTK2(x) printk x
- #else
- # define PRINTK2(x)
- #endif
- #if (DEBUG_LEVEL >= 3)
- # define PRINTK3(x) printk x
- #else
- # define PRINTK3(x)
- #endif
- 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, int);
- 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, int flags)
- {
- PRINTK1(("vfat_revalidate: %sn", dentry->d_name.name));
- spin_lock(&dcache_lock);
- if (dentry->d_time == dentry->d_parent->d_inode->i_version) {
- spin_unlock(&dcache_lock);
- return 1;
- }
- spin_unlock(&dcache_lock);
- return 0;
- }
- static int simple_getbool(char *s, int *setval)
- {
- if (s) {
- if (!strcmp(s,"1") || !strcmp(s,"yes") || !strcmp(s,"true")) {
- *setval = 1;
- } else if (!strcmp(s,"0") || !strcmp(s,"no") || !strcmp(s,"false")) {
- *setval = 0;
- } else {
- return 0;
- }
- } else {
- *setval = 1;
- }
- return 1;
- }
- static int parse_options(char *options, struct fat_mount_options *opts)
- {
- char *this_char,*value,save,*savep;
- int ret, val;
- opts->unicode_xlate = opts->posixfs = 0;
- opts->numtail = 1;
- opts->utf8 = 0;
- opts->shortname = VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95;
- /* for backward compatible */
- if (opts->nocase) {
- opts->nocase = 0;
- opts->shortname = VFAT_SFN_DISPLAY_WIN95
- | VFAT_SFN_CREATE_WIN95;
- }
- if (!options) return 1;
- save = 0;
- savep = NULL;
- ret = 1;
- for (this_char = strtok(options,","); this_char; this_char = strtok(NULL,",")) {
- if ((value = strchr(this_char,'=')) != NULL) {
- save = *value;
- savep = value;
- *value++ = 0;
- }
- if (!strcmp(this_char,"utf8")) {
- ret = simple_getbool(value, &val);
- if (ret) opts->utf8 = val;
- } else if (!strcmp(this_char,"uni_xlate")) {
- ret = simple_getbool(value, &val);
- if (ret) opts->unicode_xlate = val;
- } else if (!strcmp(this_char,"posix")) {
- ret = simple_getbool(value, &val);
- if (ret) opts->posixfs = val;
- } else if (!strcmp(this_char,"nonumtail")) {
- ret = simple_getbool(value, &val);
- if (ret) {
- opts->numtail = !val;
- }
- } else if (!strcmp(this_char, "shortname")) {
- if (!strcmp(value, "lower"))
- opts->shortname = VFAT_SFN_DISPLAY_LOWER
- | VFAT_SFN_CREATE_WIN95;
- else if (!strcmp(value, "win95"))
- opts->shortname = VFAT_SFN_DISPLAY_WIN95
- | VFAT_SFN_CREATE_WIN95;
- else if (!strcmp(value, "winnt"))
- opts->shortname = VFAT_SFN_DISPLAY_WINNT
- | VFAT_SFN_CREATE_WINNT;
- else if (!strcmp(value, "mixed"))
- opts->shortname = VFAT_SFN_DISPLAY_WINNT
- | VFAT_SFN_CREATE_WIN95;
- else
- ret = 0;
- }
- if (this_char != options)
- *(this_char-1) = ',';
- if (value) {
- *savep = save;
- }
- if (ret == 0) {
- return 0;
- }
- }
- if (opts->unicode_xlate) {
- opts->utf8 = 0;
- }
- return 1;
- }
- 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 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;
- }
- /*
- * 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)
- {
- const char *name;
- int len;
- len = qstr->len;
- name = qstr->name;
- while (len && name[len-1] == '.')
- len--;
- qstr->hash = full_name_hash(name, len);
- 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 char *name;
- int len;
- unsigned long hash;
- len = qstr->len;
- name = qstr->name;
- while (len && name[len-1] == '.')
- len--;
- 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;
- int alen, blen;
- /* A filename cannot end in '.' or we treat it like it has none */
- alen = a->len;
- blen = b->len;
- while (alen && a->name[alen-1] == '.')
- alen--;
- while (blen && b->name[blen-1] == '.')
- blen--;
- 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)
- {
- int alen, blen;
- /* A filename cannot end in '.' or we treat it like it has none */
- alen = a->len;
- blen = b->len;
- while (alen && a->name[alen-1] == '.')
- alen--;
- while (blen && b->name[blen-1] == '.')
- blen--;
- if (alen == blen) {
- if (strncmp(a->name, b->name, alen) == 0)
- return 0;
- }
- return 1;
- }
- #ifdef DEBUG
- static void dump_fat(struct super_block *sb,int start)
- {
- printk("[");
- while (start) {
- printk("%d ",start);
- start = fat_access(sb,start,-1);
- if (!start) {
- printk("ERROR");
- break;
- }
- if (start == -1) break;
- }
- printk("]n");
- }
- static void dump_de(struct msdos_dir_entry *de)
- {
- int i;
- unsigned char *p = (unsigned char *) de;
- printk("[");
- for (i = 0; i < 32; i++, p++) {
- printk("%02x ", *p);
- }
- printk("]n");
- }
- #endif
- /* MS-DOS "device special files" */
- static const char *reserved3_names[] = {
- "con ", "prn ", "nul ", "aux ", NULL
- };
- static const char *reserved4_names[] = {
- "com1 ", "com2 ", "com3 ", "com4 ", "com5 ",
- "com6 ", "com7 ", "com8 ", "com9 ",
- "lpt1 ", "lpt2 ", "lpt3 ", "lpt4 ", "lpt5 ",
- "lpt6 ", "lpt7 ", "lpt8 ", "lpt9 ",
- NULL };
- /* 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;
- }
- /* Checks the validity of a long MS-DOS filename */
- /* Returns negative number on error, 0 for a normal
- * return, and 1 for . or .. */
- static int vfat_valid_longname(const char *name, int len, int xlate)
- {
- const char **reserved, *walk;
- int baselen;
- if (len && name[len-1] == ' ') return -EINVAL;
- if (len >= 256) return -EINVAL;
- if (len < 3) return 0;
- for (walk = name; *walk != 0 && *walk != '.'; walk++);
- baselen = walk - name;
- if (baselen == 3) {
- for (reserved = reserved3_names; *reserved; reserved++) {
- if (!strnicmp(name,*reserved,baselen))
- return -EINVAL;
- }
- } else if (baselen == 4) {
- for (reserved = reserved4_names; *reserved; reserved++) {
- if (!strnicmp(name,*reserved,baselen))
- return -EINVAL;
- }
- }
- return 0;
- }
- static int vfat_find_form(struct inode *dir,char *name)
- {
- struct msdos_dir_entry *de;
- struct buffer_head *bh = NULL;
- int ino,res;
- res=fat_scan(dir,name,&bh,&de,&ino);
- fat_brelse(dir->i_sb, 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,
- 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,
- 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] = ' ';
- base[baselen] = ' ';
- /* 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 char *name, int len, char *outname, int *longlen, int *outlen,
- int escape, int utf8, struct nls_table *nls)
- {
- const unsigned char *ip;
- unsigned char nc;
- char *op;
- unsigned int ec;
- int i, k, fill;
- int charlen;
- if (utf8) {
- *outlen = utf8_mbstowcs((__u16 *) outname, name, PAGE_SIZE);
- if (name[len-1] == '.')
- *outlen-=2;
- op = &outname[*outlen * sizeof(__u16)];
- } else {
- if (name[len-1] == '.')
- len--;
- 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_fill_slots(struct inode *dir, struct msdos_dir_slot *ds, const char *name,
- int len, int *slots, int is_dir, int uni_xlate)
- {
- struct nls_table *nls_io, *nls_disk;
- wchar_t *uname;
- struct msdos_dir_slot *ps;
- struct msdos_dir_entry *de;
- unsigned long page;
- unsigned char cksum, lcase;
- char *uniname, msdos_name[MSDOS_NAME];
- int res, utf8, slot, ulen, unilen, i;
- loff_t offset;
- *slots = 0;
- utf8 = MSDOS_SB(dir->i_sb)->options.utf8;
- nls_io = MSDOS_SB(dir->i_sb)->nls_io;
- nls_disk = MSDOS_SB(dir->i_sb)->nls_disk;
- if (name[len-1] == '.')
- len--;
- if(!(page = __get_free_page(GFP_KERNEL)))
- return -ENOMEM;
- uniname = (char *) page;
- res = xlate_to_uni(name, len, uniname, &ulen, &unilen, uni_xlate,
- utf8, nls_io);
- if (res < 0)
- goto out_free;
- uname = (wchar_t *) page;
- res = vfat_is_used_badchars(uname, ulen);
- if (res < 0)
- goto out_free;
- res = vfat_create_shortname(dir, 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 = unilen / 13;
- for (cksum = i = 0; i < 11; i++) {
- cksum = (((cksum&1)<<7)|((cksum&0xfe)>>1)) + msdos_name[i];
- }
- PRINTK3(("vfat_fill_slots 3: slots=%dn",*slots));
- 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:
- PRINTK3(("vfat_fill_slots 9n"));
- /* build the entry of 8.3 alias name */
- (*slots)++;
- strncpy(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;
- }
- /* We can't get "." or ".." here - VFS takes care of those cases */
- static int vfat_build_slots(struct inode *dir, const char *name, int len,
- struct msdos_dir_slot *ds, int *slots, int is_dir)
- {
- int res, xlate;
- xlate = MSDOS_SB(dir->i_sb)->options.unicode_xlate;
- res = vfat_valid_longname(name, len, xlate);
- if (res < 0)
- return res;
- return vfat_fill_slots(dir, ds, name, len, slots, is_dir, xlate);
- }
- 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 super_block *sb = dir->i_sb;
- struct msdos_dir_slot *dir_slots;
- loff_t offset;
- int slots, slot;
- int res, len;
- struct msdos_dir_entry *dummy_de;
- struct buffer_head *dummy_bh;
- int dummy_ino;
- loff_t dummy;
- dir_slots = (struct msdos_dir_slot *)
- kmalloc(sizeof(struct msdos_dir_slot) * MSDOS_SLOTS, GFP_KERNEL);
- if (dir_slots == NULL)
- return -ENOMEM;
- len = qname->len;
- while (len && qname->name[len-1] == '.')
- len--;
- res = fat_search_long(dir, qname->name, len,
- (MSDOS_SB(sb)->options.name_check != 's')
- || !MSDOS_SB(sb)->options.posixfs,
- &dummy, &dummy);
- if (res > 0) /* found */
- res = -EEXIST;
- if (res)
- goto cleanup;
- 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_ino);
- if (offset < 0) {
- res = offset;
- goto cleanup;
- }
- fat_brelse(sb, 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->ino) < 0) {
- res = -EIO;
- goto cleanup;
- }
- memcpy(*de, dir_slots + slot, sizeof(struct msdos_dir_slot));
- fat_mark_buffer_dirty(sb, *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, &(*de)->time, &(*de)->date);
- (*de)->ctime = (*de)->time;
- (*de)->adate = (*de)->cdate = (*de)->date;
- fat_mark_buffer_dirty(sb, *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;
- int res,len;
- len = qname->len;
- while (len && qname->name[len-1] == '.')
- len--;
- 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->ino)>=0)
- return 0;
- res = -EIO;
- }
- return res ? res : -ENOENT;
- }
- struct dentry *vfat_lookup(struct inode *dir,struct dentry *dentry)
- {
- 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;
-
- PRINTK2(("vfat_lookup: name=%s, len=%dn",
- dentry->d_name.name, dentry->d_name.len));
- 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.ino, &res);
- fat_brelse(dir->i_sb, bh);
- if (res)
- return ERR_PTR(res);
- alias = d_find_alias(inode);
- if (alias) {
- if (d_invalidate(alias)==0)
- dput(alias);
- else {
- iput(inode);
- return alias;
- }
-
- }
- error:
- dentry->d_op = &vfat_dentry_ops[table];
- dentry->d_time = dentry->d_parent->d_inode->i_version;
- d_add(dentry,inode);
- return NULL;
- }
- int vfat_create(struct inode *dir,struct dentry* dentry,int mode)
- {
- 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;
- res = vfat_add_entry(dir, &dentry->d_name, 0, &sinfo, &bh, &de);
- if (res < 0)
- return res;
- inode = fat_build_inode(sb, de, sinfo.ino, &res);
- fat_brelse(sb, bh);
- if (!inode)
- return res;
- inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
- mark_inode_dirty(inode);
- inode->i_version = ++event;
- dir->i_version = event;
- dentry->d_time = dentry->d_parent->d_inode->i_version;
- d_instantiate(dentry,inode);
- return 0;
- }
- static void vfat_remove_entry(struct inode *dir,struct vfat_slot_info *sinfo,
- struct buffer_head *bh, struct msdos_dir_entry *de)
- {
- struct super_block *sb = dir->i_sb;
- loff_t offset;
- int i,ino;
- /* remove the shortname */
- dir->i_mtime = CURRENT_TIME;
- dir->i_atime = CURRENT_TIME;
- dir->i_version = ++event;
- mark_inode_dirty(dir);
- de->name[0] = DELETED_FLAG;
- fat_mark_buffer_dirty(sb, 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, &ino) < 0)
- continue;
- de->name[0] = DELETED_FLAG;
- de->attr = 0;
- fat_mark_buffer_dirty(sb, bh);
- }
- if (bh) fat_brelse(sb, 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;
- res = fat_dir_empty(dentry->d_inode);
- if (res)
- return res;
- res = vfat_find(dir,&dentry->d_name,&sinfo, &bh, &de);
- if (res<0)
- return res;
- dentry->d_inode->i_nlink = 0;
- dentry->d_inode->i_mtime = CURRENT_TIME;
- 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--;
- 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;
- PRINTK1(("vfat_unlink: %sn", dentry->d_name.name));
- res = vfat_find(dir,&dentry->d_name,&sinfo,&bh,&de);
- if (res < 0)
- return res;
- dentry->d_inode->i_nlink = 0;
- dentry->d_inode->i_mtime = CURRENT_TIME;
- 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);
- 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;
- res = vfat_add_entry(dir, &dentry->d_name, 1, &sinfo, &bh, &de);
- if (res < 0)
- return res;
- inode = fat_build_inode(sb, de, sinfo.ino, &res);
- if (!inode)
- goto out;
- inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
- mark_inode_dirty(inode);
- inode->i_version = ++event;
- dir->i_version = event;
- 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:
- fat_brelse(sb, bh);
- return res;
- mkdir_failed:
- inode->i_nlink = 0;
- inode->i_mtime = CURRENT_TIME;
- 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--;
- return res;
- }
-
- int vfat_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 *old_bh,*new_bh,*dotdot_bh;
- struct msdos_dir_entry *old_de,*new_de,*dotdot_de;
- int dotdot_ino;
- 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;
- res = vfat_find(old_dir,&old_dentry->d_name,&old_sinfo,&old_bh,&old_de);
- PRINTK3(("vfat_rename 2n"));
- if (res < 0) goto rename_done;
- is_dir = S_ISDIR(old_inode->i_mode);
- if (is_dir && (res = fat_scan(old_inode,MSDOS_DOTDOT,&dotdot_bh,
- &dotdot_de,&dotdot_ino)) < 0)
- 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_location != sinfo.ino) {
- /* WTF??? Cry and fail. */
- printk(KERN_WARNING "vfat_rename: fs corruptedn");
- 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 = ++event;
- /* 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.ino);
- mark_inode_dirty(old_inode);
- old_dir->i_version = ++event;
- 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);
- fat_mark_buffer_dirty(sb, 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:
- fat_brelse(sb, dotdot_bh);
- fat_brelse(sb, old_bh);
- fat_brelse(sb, new_bh);
- 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,
- };
- struct super_block *vfat_read_super(struct super_block *sb,void *data,
- int silent)
- {
- struct super_block *res;
-
- MSDOS_SB(sb)->options.isvfat = 1;
- res = fat_read_super(sb, data, silent, &vfat_dir_inode_operations);
- if (res == NULL)
- return NULL;
- if (parse_options((char *) data, &(MSDOS_SB(sb)->options))) {
- MSDOS_SB(sb)->options.dotsOK = 0;
- if (MSDOS_SB(sb)->options.posixfs) {
- MSDOS_SB(sb)->options.name_check = 's';
- }
- 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 res;
- }