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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [vfat/] [namei.c] - Blame information for rev 1777

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/*
 *  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@plateau.cs.berkeley.edu>.  Specify
 *    what file operation caused you trouble and if you can duplicate
 *    the problem, send a script that demonstrates it.
 */
 
#define __NO_VERSION__
#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/stat.h>
#include <linux/mm.h>
#include <linux/malloc.h>
 
#include "../fat/msbuffer.h"
 
#if 0
# define PRINTK(x) printk x
#else
# define PRINTK(x)
#endif
 
#ifndef DEBUG
# define CHECK_STACK
#else
# define CHECK_STACK check_stack(__FILE__, __LINE__)
#endif
 
/*
 * XXX: It would be better to use the tolower from linux/ctype.h,
 * but _ctype is needed and it is not exported.
 */
#define tolower(c) (((c) >= 'A' && (c) <= 'Z') ? (c)-('A'-'a') : (c))
 
struct vfat_find_info {
        const char *name;
        int len;
        int new_filename;
        int found;
        int is_long;
        off_t offset;
        off_t short_offset;
        int long_slots;
        ino_t ino;
        int posix;
};
 
void vfat_read_inode(struct inode *inode);
 
void vfat_put_super(struct super_block *sb)
{
        fat_put_super(sb);
        MOD_DEC_USE_COUNT;
}
 
 
static struct super_operations vfat_sops = {
        vfat_read_inode,
        fat_notify_change,
        fat_write_inode,
        fat_put_inode,
        vfat_put_super,
        NULL, /* added in 0.96c */
        fat_statfs,
        NULL
};
 
static int parse_options(char *options, struct fat_mount_options *opts)
{
        char *this_char,*value,save,*savep;
        int ret;
 
        opts->unicode_xlate = opts->posixfs = 0;
        opts->numtail = 1;
        opts->utf8 = 0;
 
        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")) {
                        if (value) {
                                ret = 0;
                        } else {
                                opts->utf8 = 1;
                        }
                } else if (!strcmp(this_char,"uni_xlate")) {
                        if (value) {
                                ret = 0;
                        } else {
                                opts->unicode_xlate = 1;
                        }
                }
                else if (!strcmp(this_char,"posix")) {
                        if (value) {
                                ret = 0;
                        } else {
                                opts->posixfs = 1;
                        }
                }
                else if (!strcmp(this_char,"nonumtail")) {
                        if (value) {
                                ret = 0;
                        } else {
                                opts->numtail = 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;
}
 
struct super_block *vfat_read_super(struct super_block *sb,void *data,
                                    int silent)
{
        struct super_block *res;
 
        MOD_INC_USE_COUNT;
 
        MSDOS_SB(sb)->options.isvfat = 1;
 
        sb->s_op = &vfat_sops;
        res = fat_read_super(sb, data, silent);
        if (res == NULL) {
                sb->s_dev = 0;
                MOD_DEC_USE_COUNT;
                return NULL;
        }
 
        if (!parse_options((char *) data, &(MSDOS_SB(sb)->options))) {
                MOD_DEC_USE_COUNT;
        } else {
                MSDOS_SB(sb)->options.dotsOK = 0;
        }
 
        return res;
}
 
#ifdef DEBUG
 
static void
check_stack(const char *fname, int lineno)
{
        int stack_level;
        char *pg_dir;
 
        stack_level = (long)(&pg_dir)-current->kernel_stack_page;
        if (stack_level < 0)
                printk("*-*-*-* vfat kstack overflow in %s line %d: SL=%d\n",
                       fname, lineno, stack_level);
        else if (stack_level < 500)
                printk("*-*-*-* vfat kstack low in %s line %d: SL=%d\n",
                       fname, lineno, stack_level);
#if 0
        else
                printk("------- vfat kstack ok in %s line %d: SL=%d\n",
                       fname, lineno, stack_level);
#endif
        if (*(unsigned long *) current->kernel_stack_page != STACK_MAGIC) {
                printk("******* vfat stack corruption detected in %s at line %d\n",
                       fname, lineno);
        }
}
 
static int debug = 0;
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 *reserved_names[] = {
        "CON     ","PRN     ","NUL     ","AUX     ",
        "LPT1    ","LPT2    ","LPT3    ","LPT4    ",
        "COM1    ","COM2    ","COM3    ","COM4    ",
        NULL };
 
 
/* Characters that are undesirable in an MS-DOS file name */
 
static char bad_chars[] = "*?<>|\":/\\";
static char replace_chars[] = "[];,+=";
 
static int vfat_find(struct inode *dir,const char *name,int len,
                      int find_long,int new_filename,int is_dir,
                      struct slot_info *sinfo_out);
 
/* Checks the validity of an 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 dot_dirs,
                               int xlate)
{
        const char **reserved;
        unsigned char c;
        int i;
 
        if (IS_FREE(name)) return -EINVAL;
        if (name[0] == '.' && (len == 1 || (len == 2 && name[1] == '.'))) {
                if (!dot_dirs) return -EEXIST;
                return 1;
        }
 
        if (len && name[len-1] == ' ') return -EINVAL;
        if (len >= 256) return -EINVAL;
        for (i = 0; i < len; i++) {
                c = name[i];
                if (xlate && c == ':') continue;
                if (strchr(bad_chars,c)) {
                        return -EINVAL;
                }
        }
        if (len == 3 || len == 4) {
                for (reserved = reserved_names; *reserved; reserved++)
                        if (!strncmp(name,*reserved,8)) return -EINVAL;
        }
        return 0;
}
 
static int vfat_valid_shortname(const char *name,int len,
                                int dot_dirs, int utf8)
{
        const char *walk, **reserved;
        unsigned char c;
        int space;
 
        if (IS_FREE(name)) return -EINVAL;
        if (name[0] == '.' && (len == 1 || (len == 2 && name[1] == '.'))) {
                if (!dot_dirs) return -EEXIST;
                return 1;
        }
 
        space = 1; /* disallow names starting with a dot */
        c = 0;
        for (walk = name; len && walk-name < 8;) {
                c = *walk++;
                len--;
                if (utf8 && (c & 0x80)) return -EINVAL;
                if (strchr(bad_chars,c)) return -EINVAL;
                if (strchr(replace_chars,c)) return -EINVAL;
                if (c >= 'A' && c <= 'Z') return -EINVAL;
                if (c < ' ' || c == ':' || c == '\\') return -EINVAL;
                if ((walk == name) && (c == 0xE5)) c = 0x05;
                if (c == '.') break;
                space = c == ' ';
        }
        if (space) return -EINVAL;
        if (len && c != '.') {
                c = *walk++;
                len--;
                if (c != '.') return -EINVAL;
        }
        while (c != '.' && len--) c = *walk++;
        if (c == '.') {
                if (len >= 4) return -EINVAL;
                while (len > 0 && walk-name < (MSDOS_NAME+1)) {
                        c = *walk++;
                        len--;
                        if (utf8 && (c & 0x80)) return -EINVAL;
                        if (strchr(bad_chars,c)) return -EINVAL;
                        if (strchr(replace_chars,c))
                                return -EINVAL;
                        if (c < ' ' || c == ':' || c == '\\' || c == '.')
                                return -EINVAL;
                        if (c >= 'A' && c <= 'Z') return -EINVAL;
                        space = c == ' ';
                }
                if (space) return -EINVAL;
                if (len) return -EINVAL;
        }
        for (reserved = reserved_names; *reserved; reserved++)
                if (!strncmp(name,*reserved,8)) return -EINVAL;
 
        return 0;
}
 
/* Takes a short filename and converts it to a formatted MS-DOS filename.
 * If the short filename is not a valid MS-DOS filename, an error is
 * returned.  The formatted short filename is returned in 'res'.
 */
 
static int vfat_format_name(const char *name,int len,char *res,
  int dot_dirs,int utf8)
{
        char *walk;
        const char **reserved;
        unsigned char c;
        int space;
 
        if (IS_FREE(name)) return -EINVAL;
        if (name[0] == '.' && (len == 1 || (len == 2 && name[1] == '.'))) {
                if (!dot_dirs) return -EEXIST;
                memset(res+1,' ',10);
                while (len--) *res++ = '.';
                return 0;
        }
 
        space = 1; /* disallow names starting with a dot */
        c = 0;
        for (walk = res; len && walk-res < 8; walk++) {
                c = *name++;
                len--;
                if (utf8 && (c & 0x80)) return -EINVAL;
                if (strchr(bad_chars,c)) return -EINVAL;
                if (strchr(replace_chars,c)) return -EINVAL;
                if (c >= 'A' && c <= 'Z') return -EINVAL;
                if (c < ' ' || c == ':' || c == '\\') return -EINVAL;
                if (c == '.') break;
                space = c == ' ';
                *walk = c >= 'a' && c <= 'z' ? c-32 : c;
        }
        if (space) return -EINVAL;
        if (len && c != '.') {
                c = *name++;
                len--;
                if (c != '.') return -EINVAL;
        }
        while (c != '.' && len--) c = *name++;
        if (c == '.') {
                while (walk-res < 8) *walk++ = ' ';
                while (len > 0 && walk-res < MSDOS_NAME) {
                        c = *name++;
                        len--;
                        if (utf8 && (c & 0x80)) return -EINVAL;
                        if (strchr(bad_chars,c)) return -EINVAL;
                        if (strchr(replace_chars,c))
                                return -EINVAL;
                        if (c < ' ' || c == ':' || c == '\\' || c == '.')
                                return -EINVAL;
                        if (c >= 'A' && c <= 'Z') return -EINVAL;
                        space = c == ' ';
                        *walk++ = c >= 'a' && c <= 'z' ? c-32 : c;
                }
                if (space) return -EINVAL;
                if (len) return -EINVAL;
        }
        while (walk-res < MSDOS_NAME) *walk++ = ' ';
        for (reserved = reserved_names; *reserved; reserved++)
                if (!strncmp(res,*reserved,8)) return -EINVAL;
 
        return 0;
}
 
static char skip_chars[] = ".:\"?<>| ";
 
/* Given a valid longname, create a unique shortname.  Make sure the
 * shortname does not exist
 */
static int vfat_create_shortname(struct inode *dir, const char *name,
     int len, char *name_res, int utf8)
{
        const char *ip, *ext_start, *end;
        char *p;
        int sz, extlen, baselen, totlen;
        char msdos_name[13];
        char base[9], ext[4];
        int i;
        int res;
        int spaces;
        char buf[8];
        struct slot_info sinfo;
        const char *name_start;
 
        PRINTK(("Entering vfat_create_shortname: name=%s, len=%d\n", name, len));
        sz = 0;                  /* Make compiler happy */
        if (len && name[len-1]==' ') return -EINVAL;
        if (len <= 12) {
                /* Do a case insensitive search if the name would be a valid
                 * shortname if is were all capitalized.  However, do not
                 * allow spaces in short names because Win95 scandisk does
                 * not like that */
                res = 0;
                for (i = 0, p = msdos_name, ip = name; i < len; i++, p++, ip++)
                {
                        if (*ip == ' ') {
                                res = -EINVAL;
                                break;
                        }
                        if (*ip >= 'A' && *ip <= 'Z') {
                                *p = *ip + 32;
                        } else {
                                *p = *ip;
                        }
                }
                if (res == 0) {
                        res = vfat_format_name(msdos_name, len, name_res, 1, utf8);
                }
                if (res > -1) {
                        PRINTK(("vfat_create_shortname 1\n"));
                        res = vfat_find(dir, msdos_name, len, 0, 0, 0, &sinfo);
                        PRINTK(("vfat_create_shortname 2\n"));
                        if (res > -1) return -EEXIST;
                        return 0;
                }
        }
 
        PRINTK(("vfat_create_shortname 3\n"));
        /* Now, we need to create a shortname from the long name */
        ext_start = end = &name[len];
        while (--ext_start >= name) {
                if (*ext_start == '.') {
                        if (ext_start == end - 1) {
                                sz = len;
                                ext_start = NULL;
                        }
                        break;
                }
        }
        if (ext_start == name - 1) {
                sz = len;
                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 = &name[0];
                while (name_start < ext_start)
                {
                        if (!strchr(skip_chars,*name_start)) break;
                        name_start++;
                }
                if (name_start != ext_start) {
                        sz = ext_start - name;
                        ext_start++;
                } else {
                        sz = len;
                        ext_start=NULL;
                }
        }
 
        for (baselen = i = 0, p = base, ip = name; i < sz && baselen < 8; i++)
        {
                if (utf8 && (*ip & 0x80)) {
                        *p++ = '_';
                        baselen++;
                } else if (!strchr(skip_chars, *ip)) {
                        if (*ip >= 'A' && *ip <= 'Z') {
                                *p = *ip + 32;
                        } else {
                                *p = *ip;
                        }
                        if (strchr(replace_chars, *p)) *p='_';
                        p++; baselen++;
                }
                ip++;
        }
        if (baselen == 0) {
                return -EINVAL;
        }
 
        spaces = 8 - baselen;
 
        if (ext_start) {
                extlen = 0;
                for (p = ext, ip = ext_start; extlen < 3 && ip < end; ip++) {
                        if (utf8 && (*ip & 0x80)) {
                                *p++ = '_';
                                extlen++;
                        } else if (!strchr(skip_chars, *ip)) {
                                if (*ip >= 'A' && *ip <= 'Z') {
                                        *p = *ip + 32;
                                } else {
                                        *p = *ip;
                                }
                                if (strchr(replace_chars, *p)) *p='_';
                                extlen++;
                                p++;
                        }
                }
        } else {
                extlen = 0;
        }
        ext[extlen] = '\0';
        base[baselen] = '\0';
 
        strcpy(msdos_name, base);
        msdos_name[baselen] = '.';
        strcpy(&msdos_name[baselen+1], ext);
 
        totlen = baselen + extlen + (extlen > 0);
        res = 0;
        if (MSDOS_SB(dir->i_sb)->options.numtail == 0) {
                res = vfat_find(dir, msdos_name, totlen, 0, 0, 0, &sinfo);
        }
        i = 0;
        while (res > -1) {
                /* Create the next shortname to try */
                i++;
                if (i == 10000000) return -EEXIST;
                sprintf(buf, "%d", i);
                sz = strlen(buf);
                if (sz + 1 > spaces) {
                        baselen = baselen - (sz + 1 - spaces);
                        spaces = sz + 1;
                }
 
                strncpy(msdos_name, base, baselen);
                msdos_name[baselen] = '~';
                strcpy(&msdos_name[baselen+1], buf);
                msdos_name[baselen+sz+1] = '.';
                strcpy(&msdos_name[baselen+sz+2], ext);
 
                totlen = baselen + sz + 1 + extlen + (extlen > 0);
                res = vfat_find(dir, msdos_name, totlen, 0, 0, 0, &sinfo);
        }
        res = vfat_format_name(msdos_name, totlen, name_res, 1, utf8);
        return res;
}
 
static loff_t vfat_find_free_slots(struct inode *dir,int slots)
{
        struct super_block *sb = dir->i_sb;
        loff_t offset, curr;
        struct msdos_dir_entry *de;
        struct buffer_head *bh;
        struct inode *inode;
        int ino;
        int row;
        int done;
        int res;
        int added;
 
        PRINTK(("vfat_find_free_slots: find %d free slots\n", slots));
        offset = curr = 0;
        bh = NULL;
        row = 0;
        ino = fat_get_entry(dir,&curr,&bh,&de);
 
        for (added = 0; added < 2; added++) {
                while (ino > -1) {
                        done = IS_FREE(de->name);
                        if (done) {
                                inode = iget(sb,ino);
                                if (inode) {
                                        /* Directory slots of busy deleted files aren't available yet. */
                                        done = !MSDOS_I(inode)->i_busy;
                                        /* PRINTK(("inode %d still busy\n", ino)); */
                                }
                                iput(inode);
                        }
                        if (done) {
                                row++;
                                if (row == slots) {
                                        fat_brelse(sb, bh);
                                        /* printk("----- Free offset at %d\n", offset); */
                                        return offset;
                                }
                        } else {
                                row = 0;
                                offset = curr;
                        }
                        ino = fat_get_entry(dir,&curr,&bh,&de);
                }
 
                if ((dir->i_ino == MSDOS_ROOT_INO) &&
                    (MSDOS_SB(sb)->fat_bits != 32))
                        return -ENOSPC;
                if ((res = fat_add_cluster(dir)) < 0) return res;
                ino = fat_get_entry(dir,&curr,&bh,&de);
        }
        return -ENOSPC;
}
 
/* Translate a string, including coded sequences into Unicode */
static int
xlate_to_uni(const char *name, int len, char *outname, int *outlen,
             int escape, int utf8, struct nls_table *nls)
{
        int i;
        const unsigned char *ip;
        char *op;
        int fill;
        unsigned char c1, c2, c3;
 
        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--;
                op = outname;
                if (nls) {
                        /* XXX: i is incorrectly computed. */
                        for (i = 0, ip = name, op = outname, *outlen = 0;
                             i < len && *outlen <= 260; i++, *outlen += 1)
                        {
                                if (escape && (*ip == ':')) {
                                        if (i > len - 4) return -EINVAL;
                                        c1 = fat_esc2uni[ip[1]];
                                        c2 = fat_esc2uni[ip[2]];
                                        c3 = fat_esc2uni[ip[3]];
                                        if (c1 == 255 || c2 == 255 || c3 == 255)
                                                return -EINVAL;
                                        *op++ = (c1 << 4) + (c2 >> 2);
                                        *op++ = ((c2 & 0x3) << 6) + c3;
                                        ip += 4;
                                } else {
                                        *op++ = nls->charset2uni[*ip].uni1;
                                        *op++ = nls->charset2uni[*ip].uni2;
                                        ip++;
                                }
                        }
                } 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;
 
        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_long_slots(struct msdos_dir_slot *ds, const char *name, int len,
                     char *msdos_name, int *slots,
                     int uni_xlate, int utf8, struct nls_table *nls)
{
        struct msdos_dir_slot *ps;
        struct msdos_dir_entry *de;
        int res;
        int slot;
        unsigned char cksum;
        char *uniname;
        const char *ip;
        unsigned long page;
        int unilen;
        int i;
        loff_t offset;
 
        if (name[len-1] == '.') len--;
        if(!(page = __get_free_page(GFP_KERNEL)))
                return -ENOMEM;
        uniname = (char *) page;
        res = xlate_to_uni(name, len, uniname, &unilen, uni_xlate, utf8, nls);
        if (res < 0) {
                free_page(page);
                return res;
        }
 
        *slots = unilen / 13;
        for (cksum = i = 0; i < 11; i++) {
                cksum = (((cksum&1)<<7)|((cksum&0xfe)>>1)) + msdos_name[i];
        }
        PRINTK(("vfat_fill_long_slots 3: slots=%d\n",*slots));
 
        for (ps = ds, slot = *slots; slot > 0; slot--, ps++) {
                int end, j;
 
                PRINTK(("vfat_fill_long_slots 4\n"));
                ps->id = slot;
                ps->attr = ATTR_EXT;
                ps->reserved = 0;
                ps->alias_checksum = cksum;
                ps->start = 0;
                PRINTK(("vfat_fill_long_slots 5: uniname=%s\n",uniname));
                offset = (slot - 1) * 26;
                ip = &uniname[offset];
                j = offset;
                end = 0;
                for (i = 0; i < 10; i += 2) {
                        ps->name0_4[i] = *ip++;
                        ps->name0_4[i+1] = *ip++;
                }
                PRINTK(("vfat_fill_long_slots 6\n"));
                for (i = 0; i < 12; i += 2) {
                        ps->name5_10[i] = *ip++;
                        ps->name5_10[i+1] = *ip++;
                }
                PRINTK(("vfat_fill_long_slots 7\n"));
                for (i = 0; i < 4; i += 2) {
                        ps->name11_12[i] = *ip++;
                        ps->name11_12[i+1] = *ip++;
                }
        }
        PRINTK(("vfat_fill_long_slots 8\n"));
        ds[0].id |= 0x40;
 
        de = (struct msdos_dir_entry *) ps;
        PRINTK(("vfat_fill_long_slots 9\n"));
        strncpy(de->name, msdos_name, MSDOS_NAME);
 
        free_page(page);
        return 0;
}
 
static int vfat_build_slots(struct inode *dir,const char *name,int len,
     struct msdos_dir_slot *ds, int *slots, int *is_long)
{
        struct msdos_dir_entry *de;
        char msdos_name[MSDOS_NAME];
        int res, xlate, utf8;
        struct nls_table *nls;
 
        PRINTK(("Entering vfat_build_slots: name=%s, len=%d\n", name, len));
        de = (struct msdos_dir_entry *) ds;
        xlate = MSDOS_SB(dir->i_sb)->options.unicode_xlate;
        utf8 = MSDOS_SB(dir->i_sb)->options.utf8;
        nls = MSDOS_SB(dir->i_sb)->nls_io;
 
        *slots = 1;
        *is_long = 0;
        if (len == 1 && name[0] == '.') {
                strncpy(de->name, MSDOS_DOT, MSDOS_NAME);
        } else if (len == 2 && name[0] == '.' && name[1] == '.') {
                strncpy(de->name, MSDOS_DOT, MSDOS_NAME);
        } else {
                PRINTK(("vfat_build_slots 4\n"));
                res = vfat_valid_shortname(name, len, 1, utf8);
                if (res > -1) {
                        PRINTK(("vfat_build_slots 5a\n"));
                        res = vfat_format_name(name, len, de->name, 1, utf8);
                        PRINTK(("vfat_build_slots 5b\n"));
                } else {
                        res = vfat_create_shortname(dir, name, len, msdos_name, utf8);
                        if (res < 0) {
                                return res;
                        }
 
                        res = vfat_valid_longname(name, len, 1, xlate);
                        if (res < 0) {
                                return res;
                        }
 
                        *is_long = 1;
 
                        return vfat_fill_long_slots(ds, name, len, msdos_name,
                                                    slots, xlate, utf8, nls);
                }
        }
        return 0;
}
 
static int vfat_readdir_cb(
        filldir_t filldir,
        void * buf,
        const char * name,
        int name_len,
        int is_long,
        off_t offset,
        off_t short_offset,
        int long_slots,
        ino_t ino)
{
        struct vfat_find_info *vf = (struct vfat_find_info *) buf;
        const char *s1, *s2;
        int i;
 
#ifdef DEBUG
        if (debug) printk("cb: vf.name=%s, len=%d, name=%s, name_len=%d\n",
                          vf->name, vf->len, name, name_len);
#endif
 
        /* Filenames cannot end in '.' or we treat like it has none */
        if (vf->len != name_len) {
                if ((vf->len != name_len + 1) || (vf->name[name_len] != '.')) {
                        return 0;
                }
                if (name_len == 2 && name[0] == '.' && name[1] == '.') {
                        return 0;
                }
        }
 
        s1 = name; s2 = vf->name;
        for (i = 0; i < name_len; i++) {
                if (vf->new_filename && !vf->posix) {
                        if (tolower(*s1) != tolower(*s2))
                                return 0;
                } else {
                        if (*s1 != *s2)
                                return 0;
                }
                s1++; s2++;
        }
        vf->found = 1;
        vf->is_long = is_long;
        vf->offset = (offset == 2) ? 0 : offset;
        vf->short_offset = (short_offset == 2) ? 0 : short_offset;
        vf->long_slots = long_slots;
        vf->ino = ino;
        return -1;
}
 
static int vfat_find(struct inode *dir,const char *name,int len,
    int find_long, int new_filename,int is_dir,struct slot_info *sinfo_out)
{
        struct super_block *sb = dir->i_sb;
        struct vfat_find_info vf;
        struct file fil;
        struct buffer_head *bh;
        struct msdos_dir_entry *de;
        struct msdos_dir_slot *ps;
        loff_t offset;
        struct msdos_dir_slot *ds;
        int is_long;
        int slots, slot;
        int res;
 
        PRINTK(("Entering vfat_find\n"));
 
        ds = (struct msdos_dir_slot *)
            kmalloc(sizeof(struct msdos_dir_slot)*MSDOS_SLOTS, GFP_KERNEL);
        if (ds == NULL) return -ENOMEM;
 
        fil.f_pos = 0;
        vf.name = name;
        vf.len = len;
        vf.new_filename = new_filename;
        vf.found = 0;
        vf.posix = MSDOS_SB(sb)->options.posixfs;
        res = fat_readdirx(dir,&fil,(void *)&vf,vfat_readdir_cb,NULL,1,find_long,0);
        PRINTK(("vfat_find: Debug 1\n"));
        if (res < 0) goto cleanup;
        if (vf.found) {
                if (new_filename) {
                        res = -EEXIST;
                        goto cleanup;
                }
                sinfo_out->longname_offset = vf.offset;
                sinfo_out->shortname_offset = vf.short_offset;
                sinfo_out->is_long = vf.is_long;
                sinfo_out->long_slots = vf.long_slots;
                sinfo_out->total_slots = vf.long_slots + 1;
                sinfo_out->ino = vf.ino;
 
                PRINTK(("vfat_find: Debug 2\n"));
                res = 0;
                goto cleanup;
        }
 
        PRINTK(("vfat_find: Debug 3\n"));
        if (!vf.found && !new_filename) {
                res = -ENOENT;
                goto cleanup;
        }
 
        res = vfat_build_slots(dir, name, len, ds, &slots, &is_long);
        if (res < 0) goto cleanup;
 
        de = (struct msdos_dir_entry *) ds;
 
        bh = NULL;
        if (new_filename) {
                PRINTK(("vfat_find: create file 1\n"));
                if (is_long) slots++;
                offset = vfat_find_free_slots(dir, slots);
                if (offset < 0) {
                        res = offset;
                        goto cleanup;
                }
 
                PRINTK(("vfat_find: create file 2\n"));
                /* Now create the new entry */
                bh = NULL;
                for (slot = 0, ps = ds; slot < slots; slot++, ps++) {
                        PRINTK(("vfat_find: create file 3, slot=%d\n",slot));
                        sinfo_out->ino = fat_get_entry(dir,&offset,&bh,&de);
                        if (sinfo_out->ino < 0) {
                                PRINTK(("vfat_find: problem\n"));
                                res = sinfo_out->ino;
                                goto cleanup;
                        }
                        memcpy(de, ps, sizeof(struct msdos_dir_slot));
                        fat_mark_buffer_dirty(sb, bh, 1);
                }
 
                PRINTK(("vfat_find: create file 4\n"));
                dir->i_ctime = dir->i_mtime = dir->i_atime = CURRENT_TIME;
                dir->i_dirt = 1;
 
                PRINTK(("vfat_find: create file 5\n"));
 
                fat_date_unix2dos(dir->i_mtime,&de->time,&de->date);
                de->ctime_ms = 0;
                de->ctime = de->time;
                de->adate = de->cdate = de->date;
                de->start = 0;
                de->starthi = 0;
                de->size = 0;
                de->attr = is_dir ? ATTR_DIR : ATTR_ARCH;
                de->lcase = CASE_LOWER_BASE | CASE_LOWER_EXT;
 
 
                fat_mark_buffer_dirty(sb, bh, 1);
                fat_brelse(sb, bh);
 
                sinfo_out->is_long = (slots > 1) ? 1 : 0;
                if (sinfo_out->is_long) {
                        sinfo_out->long_slots = slots - 1;
                } else {
                        sinfo_out->long_slots = 0;
                }
                sinfo_out->total_slots = slots;
                sinfo_out->shortname_offset = offset - sizeof(struct msdos_dir_slot);
                sinfo_out->longname_offset = offset - sizeof(struct msdos_dir_slot) * slots;
                res = 0;
        } else {
                res = -ENOENT;
        }
 
cleanup:
        kfree(ds);
        return res;
}
 
int vfat_lookup(struct inode *dir,const char *name,int len,
    struct inode **result)
{
        int res, ino;
        struct inode *next;
        struct slot_info sinfo;
 
        PRINTK (("vfat_lookup: name=%s, len=%d\n", name, len));
 
        *result = NULL;
        if (!dir) return -ENOENT;
        if (!S_ISDIR(dir->i_mode)) {
                iput(dir);
                return -ENOENT;
        }
        PRINTK (("vfat_lookup 2\n"));
        if (len == 1 && name[0] == '.') {
                *result = dir;
                return 0;
        }
        if (len == 2 && name[0] == '.' && name[1] == '.') {
                ino = fat_parent_ino(dir,0);
                iput(dir);
                if (ino < 0) return ino;
                if (!(*result = iget(dir->i_sb,ino))) return -EACCES;
                return 0;
        }
        if (dcache_lookup(dir, name, len, (unsigned long *) &ino) && ino) {
                iput(dir);
                if (!(*result = iget(dir->i_sb, ino)))
                        return -EACCES;
                return 0;
        }
        PRINTK (("vfat_lookup 3\n"));
        if ((res = vfat_find(dir,name,len,1,0,0,&sinfo)) < 0) {
                iput(dir);
                return res;
        }
        PRINTK (("vfat_lookup 4.5\n"));
        if (!(*result = iget(dir->i_sb,sinfo.ino))) {
                iput(dir);
                return -EACCES;
        }
        PRINTK (("vfat_lookup 5\n"));
        if (!(*result)->i_sb ||
            ((*result)->i_sb->s_magic != MSDOS_SUPER_MAGIC)) {
                /* crossed a mount point into a non-msdos fs */
                iput(dir);
                return 0;
        }
        if (MSDOS_I(*result)->i_busy) { /* mkdir in progress */
                iput(*result);
                iput(dir);
                return -ENOENT;
        }
        PRINTK (("vfat_lookup 6\n"));
        while (MSDOS_I(*result)->i_old) {
                next = MSDOS_I(*result)->i_old;
                iput(*result);
                if (!(*result = iget(next->i_sb,next->i_ino))) {
                        fat_fs_panic(dir->i_sb,"vfat_lookup: Can't happen");
                        iput(dir);
                        return -ENOENT;
                }
        }
        iput(dir);
        return 0;
}
 
 
static int vfat_create_entry(struct inode *dir,const char *name,int len,
    int is_dir, struct inode **result)
{
        struct super_block *sb = dir->i_sb;
        int res,ino;
        loff_t offset;
        struct buffer_head *bh;
        struct msdos_dir_entry *de;
        struct slot_info sinfo;
 
        PRINTK(("vfat_create_entry 1\n"));
        res = vfat_find(dir, name, len, 1, 1, is_dir, &sinfo);
        if (res < 0) {
                return res;
        }
 
        offset = sinfo.shortname_offset;
 
        PRINTK(("vfat_create_entry 2\n"));
        bh = NULL;
        ino = fat_get_entry(dir, &offset, &bh, &de);
        if (ino < 0) {
                PRINTK(("vfat_mkdir problem\n"));
                if (bh)
                        fat_brelse(sb, bh);
                return ino;
        }
        PRINTK(("vfat_create_entry 3\n"));
 
        if ((*result = iget(dir->i_sb,ino)) != NULL)
                vfat_read_inode(*result);
        fat_brelse(sb, bh);
        if (!*result)
                return -EIO;
        (*result)->i_mtime = (*result)->i_atime = (*result)->i_ctime =
            CURRENT_TIME;
        (*result)->i_dirt = 1;
        (*result)->i_version = ++event;
        dir->i_version = event;
        dcache_add(dir, name, len, ino);
 
        return 0;
}
 
int vfat_create(struct inode *dir,const char *name,int len,int mode,
        struct inode **result)
{
        int res;
 
        if (!dir) return -ENOENT;
 
        fat_lock_creation();
        res = vfat_create_entry(dir,name,len,0,result);
        if (res < 0) PRINTK(("vfat_create: unable to get new entry\n"));
 
        fat_unlock_creation();
        iput(dir);
        return res;
}
 
static int vfat_create_a_dotdir(struct inode *dir,struct inode *parent,
     struct buffer_head *bh,
     struct msdos_dir_entry *de,int ino,const char *name, int isdot)
{
        struct super_block *sb = dir->i_sb;
        struct inode *dot;
 
        PRINTK(("vfat_create_a_dotdir 1\n"));
 
        /*
         * XXX all times should be set by caller upon successful completion.
         */
        dir->i_atime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
        dir->i_dirt = 1;
        memcpy(de->name,name,MSDOS_NAME);
        de->lcase = 0;
        de->attr = ATTR_DIR;
        de->start = 0;
        de->starthi = 0;
        fat_date_unix2dos(dir->i_mtime,&de->time,&de->date);
        de->ctime_ms = 0;
        de->ctime = de->time;
        de->adate = de->cdate = de->date;
        de->size = 0;
        fat_mark_buffer_dirty(sb, bh, 1);
        if ((dot = iget(dir->i_sb,ino)) != NULL)
                vfat_read_inode(dot);
        if (!dot) return -EIO;
        dot->i_mtime = dot->i_atime = CURRENT_TIME;
        dot->i_dirt = 1;
        if (isdot) {
                dot->i_size = dir->i_size;
                MSDOS_I(dot)->i_start = MSDOS_I(dir)->i_start;
                MSDOS_I(dot)->i_logstart = MSDOS_I(dir)->i_logstart;
                dot->i_nlink = dir->i_nlink;
        } else {
                dot->i_size = parent->i_size;
                MSDOS_I(dot)->i_start = MSDOS_I(parent)->i_start;
                MSDOS_I(dot)->i_logstart = MSDOS_I(parent)->i_logstart;
                dot->i_nlink = parent->i_nlink;
        }
 
        iput(dot);
 
        PRINTK(("vfat_create_a_dotdir 2\n"));
        return 0;
}
 
static int vfat_create_dotdirs(struct inode *dir, struct inode *parent)
{
        struct super_block *sb = dir->i_sb;
        int res;
        struct buffer_head *bh;
        struct msdos_dir_entry *de;
        loff_t offset;
 
        PRINTK(("vfat_create_dotdirs 1\n"));
        if ((res = fat_add_cluster(dir)) < 0) return res;
 
        PRINTK(("vfat_create_dotdirs 2\n"));
        offset = 0;
        bh = NULL;
        if ((res = fat_get_entry(dir,&offset,&bh,&de)) < 0) return res;
 
        PRINTK(("vfat_create_dotdirs 3\n"));
        res = vfat_create_a_dotdir(dir, parent, bh, de, res, MSDOS_DOT, 1);
        PRINTK(("vfat_create_dotdirs 4\n"));
        if (res < 0) {
                fat_brelse(sb, bh);
                return res;
        }
        PRINTK(("vfat_create_dotdirs 5\n"));
 
        if ((res = fat_get_entry(dir,&offset,&bh,&de)) < 0) {
                fat_brelse(sb, bh);
                return res;
        }
        PRINTK(("vfat_create_dotdirs 6\n"));
 
        res = vfat_create_a_dotdir(dir, parent, bh, de, res, MSDOS_DOTDOT, 0);
        PRINTK(("vfat_create_dotdirs 7\n"));
        fat_brelse(sb, bh);
 
        return res;
}
 
/***** See if directory is empty */
static int vfat_empty(struct inode *dir)
{
        struct super_block *sb = dir->i_sb;
        loff_t pos;
        struct buffer_head *bh;
        struct msdos_dir_entry *de;
 
        if (dir->i_count > 1)
                return -EBUSY;
        if (MSDOS_I(dir)->i_start) { /* may be zero in mkdir */
                pos = 0;
                bh = NULL;
                while (fat_get_entry(dir,&pos,&bh,&de) > -1) {
                        /* Skip extended filename entries */
                        if (de->attr == ATTR_EXT) continue;
 
                        if (!IS_FREE(de->name) && strncmp(de->name,MSDOS_DOT,
                            MSDOS_NAME) && strncmp(de->name,MSDOS_DOTDOT,
                            MSDOS_NAME)) {
                                fat_brelse(sb, bh);
                                return -ENOTEMPTY;
                        }
                }
                if (bh)
                        fat_brelse(sb, bh);
        }
        return 0;
}
 
static int vfat_rmdir_free_ino(struct inode *dir,struct buffer_head *bh,
     struct msdos_dir_entry *de,int ino)
{
        struct super_block *sb = dir->i_sb;
        struct inode *inode;
        int res;
 
        if (ino < 0) return -EINVAL;
        if (!(inode = iget(dir->i_sb,ino))) return -ENOENT;
        if (!S_ISDIR(inode->i_mode)) {
                iput(inode);
                return -ENOTDIR;
        }
        if (dir->i_dev != inode->i_dev || dir == inode) {
                iput(inode);
                return -EBUSY;
        }
        res = vfat_empty(inode);
        if (res) {
                iput(inode);
                return res;
        }
        inode->i_nlink = 0;
        inode->i_mtime = dir->i_mtime = CURRENT_TIME;
        inode->i_atime = dir->i_atime = CURRENT_TIME;
        dir->i_nlink--;
        inode->i_dirt = dir->i_dirt = 1;
        de->name[0] = DELETED_FLAG;
        fat_mark_buffer_dirty(sb, bh, 1);
        iput(inode);
 
        return 0;
}
 
static int vfat_unlink_free_ino(struct inode *dir,struct buffer_head *bh,
     struct msdos_dir_entry *de,int ino,int nospc)
{
        struct super_block *sb = dir->i_sb;
        struct inode *inode;
        if (!(inode = iget(dir->i_sb,ino))) return -ENOENT;
        if ((!S_ISREG(inode->i_mode) && nospc) || IS_IMMUTABLE(inode)) {
                iput(inode);
                return -EPERM;
        }
        inode->i_nlink = 0;
        inode->i_mtime = dir->i_mtime = CURRENT_TIME;
        inode->i_atime = dir->i_atime = CURRENT_TIME;
        dir->i_version = ++event;
        MSDOS_I(inode)->i_busy = 1;
        inode->i_dirt = dir->i_dirt = 1;
        de->name[0] = DELETED_FLAG;
        fat_mark_buffer_dirty(sb, bh, 1);
 
        iput(inode);
        return 0;
}
 
static int vfat_remove_entry(struct inode *dir,struct slot_info *sinfo,
     struct buffer_head **bh,struct msdos_dir_entry **de,
     int is_dir,int nospc)
{
        struct super_block *sb = dir->i_sb;
        loff_t offset;
        int res, i;
 
        /* remove the shortname */
        offset = sinfo->shortname_offset;
        res = fat_get_entry(dir, &offset, bh, de);
        if (res < 0) return res;
        if (is_dir) {
                res = vfat_rmdir_free_ino(dir,*bh,*de,res);
        } else {
                res = vfat_unlink_free_ino(dir,*bh,*de,res,nospc);
        }
        if (res < 0) return res;
 
        /* remove the longname */
        offset = sinfo->longname_offset;
        for (i = sinfo->long_slots; i > 0; --i) {
                res = fat_get_entry(dir, &offset, bh, de);
                if (res < 0) {
                        printk("vfat_remove_entry: problem 1\n");
                        continue;
                }
                (*de)->name[0] = DELETED_FLAG;
                (*de)->attr = 0;
                fat_mark_buffer_dirty(sb, *bh, 1);
        }
        return 0;
}
 
 
static int vfat_rmdirx(struct inode *dir,const char *name,int len)
{
        struct super_block *sb = dir->i_sb;
        int res;
        struct buffer_head *bh;
        struct msdos_dir_entry *de;
        struct slot_info sinfo;
 
        bh = NULL;
        res = -EPERM;
        if (name[0] == '.' && (len == 1 || (len == 2 && name[1] == '.')))
                goto rmdir_done;
        res = vfat_find(dir,name,len,1,0,0,&sinfo);
 
        if (res >= 0 && sinfo.total_slots > 0) {
                res = vfat_remove_entry(dir,&sinfo,&bh,&de,1,0);
                if (res > 0) {
                        res = 0;
                }
                dir->i_version = ++event;
        }
 
rmdir_done:
        fat_brelse(sb, bh);
        return res;
}
 
/***** Remove a directory */
int vfat_rmdir(struct inode *dir,const char *name,int len)
{
        int res;
 
        res = vfat_rmdirx(dir, name, len);
        iput(dir);
        return res;
}
 
static int vfat_unlinkx(
        struct inode *dir,
        const char *name,
        int len,
        int nospc)      /* Flag special file ? */
{
        struct super_block *sb = dir->i_sb;
        int res;
        struct buffer_head *bh;
        struct msdos_dir_entry *de;
        struct slot_info sinfo;
 
        bh = NULL;
        res = vfat_find(dir,name,len,1,0,0,&sinfo);
 
        if (res >= 0 && sinfo.total_slots > 0) {
                res = vfat_remove_entry(dir,&sinfo,&bh,&de,0,nospc);
                if (res > 0) {
                        res = 0;
                }
        }
 
        fat_brelse(sb, bh);
        return res;
}
 
 
int vfat_mkdir(struct inode *dir,const char *name,int len,int mode)
{
        struct inode *inode;
        int res;
 
        fat_lock_creation();
        if ((res = vfat_create_entry(dir,name,len,1,&inode)) < 0) {
                fat_unlock_creation();
                iput(dir);
                return res;
        }
 
        dir->i_nlink++;
        inode->i_nlink = 2; /* no need to mark them dirty */
        MSDOS_I(inode)->i_busy = 1; /* prevent lookups */
 
        res = vfat_create_dotdirs(inode, dir);
        fat_unlock_creation();
        MSDOS_I(inode)->i_busy = 0;
        iput(inode);
        iput(dir);
        if (res < 0) {
                if (vfat_rmdir(dir,name,len) < 0)
                        fat_fs_panic(dir->i_sb,"rmdir in mkdir failed");
        }
        return res;
}
 
/***** Unlink, as called for msdosfs */
int vfat_unlink(struct inode *dir,const char *name,int len)
{
        int res;
 
        res = vfat_unlinkx (dir,name,len,1);
        iput(dir);
        return res;
}
 
/***** Unlink, as called for uvfatfs */
int vfat_unlink_uvfat(struct inode *dir,const char *name,int len)
{
        int res;
 
        res = vfat_unlinkx (dir,name,len,0);
        iput(dir);
        return res;
}
 
int vfat_rename(struct inode *old_dir,const char *old_name,int old_len,
        struct inode *new_dir,const char *new_name,int new_len,int must_be_dir)
{
        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;
        loff_t old_offset,new_offset,old_longname_offset;
        int old_slots,old_ino,new_ino,dotdot_ino,ino;
        struct inode *old_inode, *new_inode, *dotdot_inode, *walk;
        int res, is_dir, i;
        int locked = 0;
        struct slot_info sinfo;
 
        PRINTK(("vfat_rename 1\n"));
        if (old_dir == new_dir && old_len == new_len &&
            strncmp(old_name, new_name, old_len) == 0)
                return 0;
 
        old_bh = new_bh = NULL;
        old_inode = new_inode = NULL;
        res = vfat_find(old_dir,old_name,old_len,1,0,0,&sinfo);
        PRINTK(("vfat_rename 2\n"));
        if (res < 0) goto rename_done;
 
        old_slots = sinfo.total_slots;
        old_longname_offset = sinfo.longname_offset;
        old_offset = sinfo.shortname_offset;
        old_ino = sinfo.ino;
        res = fat_get_entry(old_dir, &old_offset, &old_bh, &old_de);
        PRINTK(("vfat_rename 3\n"));
        if (res < 0) goto rename_done;
 
        res = -ENOENT;
        if (!(old_inode = iget(old_dir->i_sb,old_ino)))
                goto rename_done;
        is_dir = S_ISDIR(old_inode->i_mode);
        if (must_be_dir && !is_dir)
                goto rename_done;
        if (is_dir) {
                if ((old_dir->i_dev != new_dir->i_dev) ||
                    (old_ino == new_dir->i_ino)) {
                        res = -EINVAL;
                        goto rename_done;
                }
                if (!(walk = iget(new_dir->i_sb,new_dir->i_ino))) return -EIO;
                /* prevent moving directory below itself */
                while (walk->i_ino != MSDOS_ROOT_INO) {
                        ino = fat_parent_ino(walk,1);
                        iput(walk);
                        if (ino < 0) {
                                res = ino;
                                goto rename_done;
                        }
                        if (ino == old_ino) {
                                res = -EINVAL;
                                goto rename_done;
                        }
                        if (!(walk = iget(new_dir->i_sb,ino))) {
                                res = -EIO;
                                goto rename_done;
                        }
                }
                iput(walk);
        }
 
        res = vfat_find(new_dir,new_name,new_len,1,0,is_dir,&sinfo);
 
        PRINTK(("vfat_rename 4\n"));
        if (res > -1) {
                int new_is_dir;
 
                PRINTK(("vfat_rename 5\n"));
                /* Filename currently exists.  Need to delete it */
                new_offset = sinfo.shortname_offset;
                res = fat_get_entry(new_dir, &new_offset, &new_bh, &new_de);
                PRINTK(("vfat_rename 6\n"));
                if (res < 0) goto rename_done;
 
                if (!(new_inode = iget(new_dir->i_sb,res)))
                        goto rename_done;
                new_is_dir = S_ISDIR(new_inode->i_mode);
                iput(new_inode);
                if (new_is_dir) {
                        PRINTK(("vfat_rename 7\n"));
                        res = vfat_rmdirx(new_dir,new_name,new_len);
                        PRINTK(("vfat_rename 8\n"));
                        if (res < 0) goto rename_done;
                } else {
                        /* Is this the same file, different case? */
                        if (new_inode != old_inode) {
                                PRINTK(("vfat_rename 9\n"));
                                res = vfat_unlinkx(new_dir,new_name,new_len,1);
                                PRINTK(("vfat_rename 10\n"));
                                if (res < 0) goto rename_done;
                        }
                }
        }
 
        PRINTK(("vfat_rename 11\n"));
        fat_lock_creation(); locked = 1;
        res = vfat_find(new_dir,new_name,new_len,1,1,is_dir,&sinfo);
 
        PRINTK(("vfat_rename 12\n"));
        if (res < 0) goto rename_done;
 
        new_offset = sinfo.shortname_offset;
        new_ino = sinfo.ino;
        res = fat_get_entry(new_dir, &new_offset, &new_bh, &new_de);
        PRINTK(("vfat_rename 13\n"));
        if (res < 0) goto rename_done;
 
        new_de->attr = old_de->attr;
        new_de->time = old_de->time;
        new_de->date = old_de->date;
        new_de->ctime_ms = old_de->ctime_ms;
        new_de->cdate = old_de->cdate;
        new_de->adate = old_de->adate;
        new_de->start = old_de->start;
        new_de->starthi = old_de->starthi;
        new_de->size = old_de->size;
 
        if (!(new_inode = iget(new_dir->i_sb,new_ino))) goto rename_done;
        PRINTK(("vfat_rename 14\n"));
 
        /* At this point, we have the inodes of the old file and the
         * new file.  We need to transfer all information from the old
         * inode to the new inode and then delete the slots of the old
         * entry
         */
 
        vfat_read_inode(new_inode);
        MSDOS_I(old_inode)->i_busy = 1;
        MSDOS_I(old_inode)->i_linked = new_inode;
        MSDOS_I(new_inode)->i_oldlink = old_inode;
        fat_cache_inval_inode(old_inode);
        PRINTK(("vfat_rename 15: old_slots=%d\n",old_slots));
        old_inode->i_dirt = 1;
        old_dir->i_version = ++event;
 
        /* remove the old entry */
        for (i = old_slots; i > 0; --i) {
                res = fat_get_entry(old_dir, &old_longname_offset, &old_bh, &old_de);
                if (res < 0) {
                        printk("vfat_unlinkx: problem 1\n");
                        continue;
                }
                old_de->name[0] = DELETED_FLAG;
                old_de->attr = 0;
                fat_mark_buffer_dirty(sb, old_bh, 1);
        }
        PRINTK(("vfat_rename 15b\n"));
 
        fat_mark_buffer_dirty(sb, new_bh, 1);
        dcache_add(new_dir, new_name, new_len, new_ino);
 
        /* XXX: There is some code in the original MSDOS rename that
         * is not duplicated here and it might cause a problem in
         * certain circumstances.
         */
 
        if (S_ISDIR(old_inode->i_mode)) {
                if ((res = fat_scan(old_inode,MSDOS_DOTDOT,&dotdot_bh,
                    &dotdot_de,&dotdot_ino,SCAN_ANY)) < 0) goto rename_done;
                if (!(dotdot_inode = iget(old_inode->i_sb,dotdot_ino))) {
                        fat_brelse(sb, dotdot_bh);
                        res = -EIO;
                        goto rename_done;
                }
                MSDOS_I(dotdot_inode)->i_start = MSDOS_I(new_dir)->i_start;
                MSDOS_I(dotdot_inode)->i_logstart = MSDOS_I(new_dir)->i_logstart;
                dotdot_de->start = CT_LE_W(MSDOS_I(new_dir)->i_logstart);
                dotdot_de->starthi = CT_LE_W((MSDOS_I(new_dir)->i_logstart) >> 16);
                dotdot_inode->i_dirt = 1;
                fat_mark_buffer_dirty(sb, dotdot_bh, 1);
                old_dir->i_nlink--;
                new_dir->i_nlink++;
                /* no need to mark them dirty */
                dotdot_inode->i_nlink = new_dir->i_nlink;
                iput(dotdot_inode);
                fat_brelse(sb, dotdot_bh);
        }
 
        if (res > 0) res = 0;
 
rename_done:
        if (locked)
                fat_unlock_creation();
        if (old_bh)
                fat_brelse(sb, old_bh);
        if (new_bh)
                fat_brelse(sb, new_bh);
        if (old_inode)
                iput(old_inode);
        iput(old_dir);
        iput(new_dir);
        return res;
}
 
 
 
/* Public inode operations for the VFAT fs */
struct inode_operations vfat_dir_inode_operations = {
        &fat_dir_operations,    /* default directory file-ops */
        vfat_create,            /* create */
        vfat_lookup,            /* lookup */
        NULL,                   /* link */
        vfat_unlink,            /* unlink */
        NULL,                   /* symlink */
        vfat_mkdir,             /* mkdir */
        vfat_rmdir,             /* rmdir */
        NULL,                   /* mknod */
        vfat_rename,            /* rename */
        NULL,                   /* readlink */
        NULL,                   /* follow_link */
        NULL,                   /* readpage */
        NULL,                   /* writepage */
        fat_bmap,               /* bmap */
        NULL,                   /* truncate */
        NULL                    /* permission */
};
 
 
void vfat_read_inode(struct inode *inode)
{
        fat_read_inode(inode, &vfat_dir_inode_operations);
}
 
#ifdef MODULE
int init_module(void)
{
        return init_vfat_fs();
}
 
 
void cleanup_module(void)
{
        unregister_filesystem(&vfat_fs_type);
}
 
#endif /* ifdef MODULE */
 
 
 
/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * Emacs will notice this stuff at the end of the file and automatically
 * adjust the settings for this buffer only.  This must remain at the end
 * of the file.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-indent-level: 8
 * c-brace-imaginary-offset: 0
 * c-brace-offset: -8
 * c-argdecl-indent: 8
 * c-label-offset: -8
 * c-continued-statement-offset: 8
 * c-continued-brace-offset: 0
 * End:
 */
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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [fs/] [vfat/] [namei.c] - Blame information for rev 1777

Line No.	Rev	Author	Line
1	1628	jcastillo	`/*`
2			`* linux/fs/vfat/namei.c`
3			`*`
4			`* Written 1992,1993 by Werner Almesberger`
5			`*`
6			`* Windows95/Windows NT compatible extended MSDOS filesystem`
7			`* by Gordon Chaffee Copyright (C) 1995. Send bug reports for the`
8			`* VFAT filesystem to <chaffee@plateau.cs.berkeley.edu>. Specify`
9			`* what file operation caused you trouble and if you can duplicate`
10			`* the problem, send a script that demonstrates it.`
11			`*/`
12
13			`#define __NO_VERSION__`
14			`#include <linux/module.h>`
15
16			`#include <linux/sched.h>`
17			`#include <linux/msdos_fs.h>`
18			`#include <linux/nls.h>`
19			`#include <linux/kernel.h>`
20			`#include <linux/errno.h>`
21			`#include <linux/string.h>`
22			`#include <linux/stat.h>`
23			`#include <linux/mm.h>`
24			`#include <linux/malloc.h>`
25
26			`#include "../fat/msbuffer.h"`
27
28			`#if 0`
29			`# define PRINTK(x) printk x`
30			`#else`
31			`# define PRINTK(x)`
32			`#endif`
33
34			`#ifndef DEBUG`
35			`# define CHECK_STACK`
36			`#else`
37			`# define CHECK_STACK check_stack(__FILE__, __LINE__)`
38			`#endif`
39
40			`/*`