+++ /dev/null
-/*
- * linux/fs/vfat/namei.c
- *
- * Written 1992,1993 by Werner Almesberger
- *
- * Windows95/Windows NT compatible extended MSDOS filesystem
- * by Gordon Chaffee Copyright (C) 1995. Send bug reports for the
- * VFAT filesystem to <chaffee@cs.berkeley.edu>. Specify
- * what file operation caused you trouble and if you can duplicate
- * the problem, send a script that demonstrates it.
- *
- * Short name translation 1999, 2001 by Wolfram Pienkoss <wp@bszh.de>
- *
- * Support Multibyte characters and cleanup by
- * OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
- */
-
-#include <linux/module.h>
-
-#include <linux/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_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;
-}
-
-/* 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(nls_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 (nls_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;
-}
-
-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,
- }
-};
-
-/* Characters that are undesirable in an MS-DOS file name */
-
-static inline wchar_t vfat_bad_char(wchar_t w)
-{
- return (w < 0x0020)
- || (w == '*') || (w == '?') || (w == '<') || (w == '>')
- || (w == '|') || (w == '"') || (w == ':') || (w == '/')
- || (w == '\\');
-}
-
-static inline wchar_t vfat_replace_char(wchar_t w)
-{
- return (w == '[') || (w == ']') || (w == ';') || (w == ',')
- || (w == '+') || (w == '=');
-}
-
-static wchar_t vfat_skip_char(wchar_t w)
-{
- return (w == '.') || (w == ' ');
-}
-
-static inline int vfat_is_used_badchars(const wchar_t *s, int len)
-{
- int i;
-
- for (i = 0; i < len; i++)
- if (vfat_bad_char(s[i]))
- return -EINVAL;
-
- if (s[i - 1] == ' ') /* last character cannot be space */
- return -EINVAL;
-
- return 0;
-}
-
-static int vfat_find_form(struct inode *dir, unsigned char *name)
-{
- struct fat_slot_info sinfo;
- int err = fat_scan(dir, name, &sinfo);
- if (err)
- return -ENOENT;
- brelse(sinfo.bh);
- return 0;
-}
-
-/*
- * 1) Valid characters for the 8.3 format alias are any combination of
- * letters, uppercase alphabets, digits, any of the
- * following special characters:
- * $ % ' ` - @ { } ~ ! # ( ) & _ ^
- * In this case Longfilename is not stored in disk.
- *
- * WinNT's Extension:
- * File name and extension name is contain uppercase/lowercase
- * only. And it is expressed by CASE_LOWER_BASE and CASE_LOWER_EXT.
- *
- * 2) File name is 8.3 format, but it contain the uppercase and
- * lowercase char, muliti bytes char, etc. In this case numtail is not
- * added, but Longfilename is stored.
- *
- * 3) When the one except for the above, or the following special
- * character are contained:
- * . [ ] ; , + =
- * numtail is added, and Longfilename must be stored in disk .
- */
-struct shortname_info {
- unsigned char lower:1,
- upper:1,
- valid:1;
-};
-#define INIT_SHORTNAME_INFO(x) do { \
- (x)->lower = 1; \
- (x)->upper = 1; \
- (x)->valid = 1; \
-} while (0)
-
-static inline int to_shortname_char(struct nls_table *nls,
- unsigned char *buf, int buf_size,
- wchar_t *src, struct shortname_info *info)
-{
- int len;
-
- if (vfat_skip_char(*src)) {
- info->valid = 0;
- return 0;
- }
- if (vfat_replace_char(*src)) {
- info->valid = 0;
- buf[0] = '_';
- return 1;
- }
-
- len = nls->uni2char(*src, buf, buf_size);
- if (len <= 0) {
- info->valid = 0;
- buf[0] = '_';
- len = 1;
- } else if (len == 1) {
- unsigned char prev = buf[0];
-
- if (buf[0] >= 0x7F) {
- info->lower = 0;
- info->upper = 0;
- }
-
- buf[0] = nls_toupper(nls, buf[0]);
- if (isalpha(buf[0])) {
- if (buf[0] == prev)
- info->lower = 0;
- else
- info->upper = 0;
- }
- } else {
- info->lower = 0;
- info->upper = 0;
- }
-
- return len;
-}
-
-/*
- * Given a valid longname, create a unique shortname. Make sure the
- * shortname does not exist
- * Returns negative number on error, 0 for a normal
- * return, and 1 for valid shortname
- */
-static int vfat_create_shortname(struct inode *dir, struct nls_table *nls,
- wchar_t *uname, int ulen,
- unsigned char *name_res, unsigned char *lcase)
-{
- struct fat_mount_options *opts = &MSDOS_SB(dir->i_sb)->options;
- wchar_t *ip, *ext_start, *end, *name_start;
- unsigned char base[9], ext[4], buf[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;
-
- is_shortname = 1;
- INIT_SHORTNAME_INFO(&base_info);
- INIT_SHORTNAME_INFO(&ext_info);
-
- /* Now, we need to create a shortname from the long name */
- ext_start = end = &uname[ulen];
- while (--ext_start >= uname) {
- if (*ext_start == 0x002E) { /* is `.' */
- if (ext_start == end - 1) {
- sz = ulen;
- ext_start = NULL;
- }
- break;
- }
- }
-
- if (ext_start == uname - 1) {
- sz = ulen;
- ext_start = NULL;
- } else if (ext_start) {
- /*
- * Names which start with a dot could be just
- * an extension eg. "...test". In this case Win95
- * uses the extension as the name and sets no extension.
- */
- name_start = &uname[0];
- while (name_start < ext_start) {
- if (!vfat_skip_char(*name_start))
- break;
- name_start++;
- }
- if (name_start != ext_start) {
- sz = ext_start - uname;
- ext_start++;
- } else {
- sz = ulen;
- ext_start = NULL;
- }
- }
-
- numtail_baselen = 6;
- numtail2_baselen = 2;
- for (baselen = i = 0, p = base, ip = uname; i < sz; i++, ip++) {
- chl = to_shortname_char(nls, charbuf, sizeof(charbuf),
- ip, &base_info);
- if (chl == 0)
- continue;
-
- if (baselen < 2 && (baselen + chl) > 2)
- numtail2_baselen = baselen;
- if (baselen < 6 && (baselen + chl) > 6)
- numtail_baselen = baselen;
- for (chi = 0; chi < chl; chi++) {
- *p++ = charbuf[chi];
- baselen++;
- if (baselen >= 8)
- break;
- }
- if (baselen >= 8) {
- if ((chi < chl - 1) || (ip + 1) - uname < sz)
- is_shortname = 0;
- break;
- }
- }
- if (baselen == 0) {
- return -EINVAL;
- }
-
- extlen = 0;
- if (ext_start) {
- for (p = ext, ip = ext_start; extlen < 3 && ip < end; ip++) {
- chl = to_shortname_char(nls, charbuf, sizeof(charbuf),
- ip, &ext_info);
- if (chl == 0)
- continue;
-
- if ((extlen + chl) > 3) {
- is_shortname = 0;
- break;
- }
- for (chi = 0; chi < chl; chi++) {
- *p++ = charbuf[chi];
- extlen++;
- }
- if (extlen >= 3) {
- if (ip + 1 != end)
- is_shortname = 0;
- break;
- }
- }
- }
- ext[extlen] = '\0';
- base[baselen] = '\0';
-
- /* Yes, it can happen. ".\xe5" would do it. */
- if (base[0] == DELETED_FLAG)
- base[0] = 0x05;
-
- /* OK, at this point we know that base is not longer than 8 symbols,
- * ext is not longer than 3, base is nonempty, both don't contain
- * any bad symbols (lowercase transformed to uppercase).
- */
-
- memset(name_res, ' ', MSDOS_NAME);
- memcpy(name_res, base, baselen);
- memcpy(name_res + 8, ext, extlen);
- *lcase = 0;
- if (is_shortname && base_info.valid && ext_info.valid) {
- if (vfat_find_form(dir, name_res) == 0)
- return -EEXIST;
-
- if (opts->shortname & VFAT_SFN_CREATE_WIN95) {
- return (base_info.upper && ext_info.upper);
- } else if (opts->shortname & VFAT_SFN_CREATE_WINNT) {
- if ((base_info.upper || base_info.lower) &&
- (ext_info.upper || ext_info.lower)) {
- if (!base_info.upper && base_info.lower)
- *lcase |= CASE_LOWER_BASE;
- if (!ext_info.upper && ext_info.lower)
- *lcase |= CASE_LOWER_EXT;
- return 1;
- }
- return 0;
- } else {
- BUG();
- }
- }
-
- if (opts->numtail == 0)
- if (vfat_find_form(dir, name_res) < 0)
- return 0;
-
- /*
- * Try to find a unique extension. This used to
- * iterate through all possibilities sequentially,
- * but that gave extremely bad performance. Windows
- * only tries a few cases before using random
- * values for part of the base.
- */
-
- if (baselen > 6) {
- baselen = numtail_baselen;
- name_res[7] = ' ';
- }
- name_res[baselen] = '~';
- for (i = 1; i < 10; i++) {
- name_res[baselen + 1] = i + '0';
- if (vfat_find_form(dir, name_res) < 0)
- return 0;
- }
-
- i = jiffies & 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, PATH_MAX);
-
- /*
- * We stripped '.'s before and set len appropriately,
- * but utf8_mbstowcs doesn't care about len
- */
- *outlen -= (name_len - len);
-
- if (*outlen > 255)
- return -ENAMETOOLONG;
-
- op = &outname[*outlen * sizeof(wchar_t)];
- } else {
- if (nls) {
- for (i = 0, ip = name, op = outname, *outlen = 0;
- i < len && *outlen <= 255;
- *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;
- }
- }
- if (i < len)
- return -ENAMETOOLONG;
- } else {
- for (i = 0, ip = name, op = outname, *outlen = 0;
- i < len && *outlen <= 255;
- i++, *outlen += 1)
- {
- *op++ = *ip++;
- *op++ = 0;
- }
- if (i < len)
- return -ENAMETOOLONG;
- }
- }
-
- *longlen = *outlen;
- if (*outlen % 13) {
- *op++ = 0;
- *op++ = 0;
- *outlen += 1;
- if (*outlen % 13) {
- fill = 13 - (*outlen % 13);
- for (i = 0; i < fill; i++) {
- *op++ = 0xff;
- *op++ = 0xff;
- }
- *outlen += fill;
- }
- }
-
- return 0;
-}
-
-static int vfat_build_slots(struct inode *dir, const unsigned char *name,
- int len, int is_dir, int cluster,
- struct timespec *ts,
- struct msdos_dir_slot *slots, int *nr_slots)
-{
- struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb);
- struct fat_mount_options *opts = &sbi->options;
- struct msdos_dir_slot *ps;
- struct msdos_dir_entry *de;
- unsigned char cksum, lcase;
- unsigned char msdos_name[MSDOS_NAME];
- wchar_t *uname;
- __le16 time, date;
- int err, ulen, usize, i;
- loff_t offset;
-
- *nr_slots = 0;
-
- uname = __getname();
- if (!uname)
- return -ENOMEM;
-
- err = xlate_to_uni(name, len, (unsigned char *)uname, &ulen, &usize,
- opts->unicode_xlate, opts->utf8, sbi->nls_io);
- if (err)
- goto out_free;
-
- err = vfat_is_used_badchars(uname, ulen);
- if (err)
- goto out_free;
-
- err = vfat_create_shortname(dir, sbi->nls_disk, uname, ulen,
- msdos_name, &lcase);
- if (err < 0)
- goto out_free;
- else if (err == 1) {
- de = (struct msdos_dir_entry *)slots;
- err = 0;
- goto shortname;
- }
-
- /* build the entry of long file name */
- cksum = fat_checksum(msdos_name);
-
- *nr_slots = usize / 13;
- for (ps = slots, i = *nr_slots; i > 0; i--, ps++) {
- ps->id = i;
- ps->attr = ATTR_EXT;
- ps->reserved = 0;
- ps->alias_checksum = cksum;
- ps->start = 0;
- offset = (i - 1) * 13;
- fatwchar_to16(ps->name0_4, uname + offset, 5);
- fatwchar_to16(ps->name5_10, uname + offset + 5, 6);
- fatwchar_to16(ps->name11_12, uname + offset + 11, 2);
- }
- slots[0].id |= 0x40;
- de = (struct msdos_dir_entry *)ps;
-
-shortname:
- /* build the entry of 8.3 alias name */
- (*nr_slots)++;
- memcpy(de->name, msdos_name, MSDOS_NAME);
- de->attr = is_dir ? ATTR_DIR : ATTR_ARCH;
- de->lcase = lcase;
- fat_date_unix2dos(ts->tv_sec, &time, &date, sbi->options.tz_utc);
- de->time = de->ctime = time;
- de->date = de->cdate = de->adate = date;
- de->ctime_cs = 0;
- de->start = cpu_to_le16(cluster);
- de->starthi = cpu_to_le16(cluster >> 16);
- de->size = 0;
-out_free:
- __putname(uname);
- return err;
-}
-
-static int vfat_add_entry(struct inode *dir, struct qstr *qname, int is_dir,
- int cluster, struct timespec *ts,
- struct fat_slot_info *sinfo)
-{
- struct msdos_dir_slot *slots;
- unsigned int len;
- int err, nr_slots;
-
- len = vfat_striptail_len(qname);
- if (len == 0)
- return -ENOENT;
-
- slots = kmalloc(sizeof(*slots) * MSDOS_SLOTS, GFP_NOFS);
- if (slots == NULL)
- return -ENOMEM;
-
- err = vfat_build_slots(dir, qname->name, len, is_dir, cluster, ts,
- slots, &nr_slots);
- if (err)
- goto cleanup;
-
- err = fat_add_entries(dir, slots, nr_slots, sinfo);
- if (err)
- goto cleanup;
-
- /* update timestamp */
- dir->i_ctime = dir->i_mtime = dir->i_atime = *ts;
- if (IS_DIRSYNC(dir))
- (void)fat_sync_inode(dir);
- else
- mark_inode_dirty(dir);
-cleanup:
- kfree(slots);
- return err;
-}
-
-static int vfat_find(struct inode *dir, struct qstr *qname,
- struct fat_slot_info *sinfo)
-{
- unsigned int len = vfat_striptail_len(qname);
- if (len == 0)
- return -ENOENT;
- return fat_search_long(dir, qname->name, len, sinfo);
-}
-
-static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
- struct nameidata *nd)
-{
- struct super_block *sb = dir->i_sb;
- struct fat_slot_info sinfo;
- struct inode *inode = NULL;
- struct dentry *alias;
- int err, table;
-
- lock_super(sb);
- table = (MSDOS_SB(sb)->options.name_check == 's') ? 2 : 0;
- dentry->d_op = &vfat_dentry_ops[table];
-
- err = vfat_find(dir, &dentry->d_name, &sinfo);
- if (err) {
- table++;
- goto error;
- }
- inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
- brelse(sinfo.bh);
- if (IS_ERR(inode)) {
- unlock_super(sb);
- return ERR_CAST(inode);
- }
- alias = d_find_alias(inode);
- if (alias) {
- if (d_invalidate(alias) == 0)
- dput(alias);
- else {
- iput(inode);
- unlock_super(sb);
- return alias;
- }
-
- }
-error:
- unlock_super(sb);
- 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;
-}
-
-static int vfat_create(struct inode *dir, struct dentry *dentry, int mode,
- struct nameidata *nd)
-{
- struct super_block *sb = dir->i_sb;
- struct inode *inode;
- struct fat_slot_info sinfo;
- struct timespec ts;
- int err;
-
- lock_super(sb);
-
- ts = CURRENT_TIME_SEC;
- err = vfat_add_entry(dir, &dentry->d_name, 0, 0, &ts, &sinfo);
- if (err)
- goto out;
- dir->i_version++;
-
- inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
- brelse(sinfo.bh);
- if (IS_ERR(inode)) {
- err = PTR_ERR(inode);
- goto out;
- }
- inode->i_version++;
- inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
- /* timestamp is already written, so mark_inode_dirty() is unneeded. */
-
- dentry->d_time = dentry->d_parent->d_inode->i_version;
- d_instantiate(dentry, inode);
-out:
- unlock_super(sb);
- return err;
-}
-
-static int vfat_rmdir(struct inode *dir, struct dentry *dentry)
-{
- struct inode *inode = dentry->d_inode;
- struct super_block *sb = dir->i_sb;
- struct fat_slot_info sinfo;
- int err;
-
- lock_super(sb);
-
- err = fat_dir_empty(inode);
- if (err)
- goto out;
- err = vfat_find(dir, &dentry->d_name, &sinfo);
- if (err)
- goto out;
-
- err = fat_remove_entries(dir, &sinfo); /* and releases bh */
- if (err)
- goto out;
- drop_nlink(dir);
-
- clear_nlink(inode);
- inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
- fat_detach(inode);
-out:
- unlock_super(sb);
-
- return err;
-}
-
-static int vfat_unlink(struct inode *dir, struct dentry *dentry)
-{
- struct inode *inode = dentry->d_inode;
- struct super_block *sb = dir->i_sb;
- struct fat_slot_info sinfo;
- int err;
-
- lock_super(sb);
-
- err = vfat_find(dir, &dentry->d_name, &sinfo);
- if (err)
- goto out;
-
- err = fat_remove_entries(dir, &sinfo); /* and releases bh */
- if (err)
- goto out;
- clear_nlink(inode);
- inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
- fat_detach(inode);
-out:
- unlock_super(sb);
-
- return err;
-}
-
-static int vfat_mkdir(struct inode *dir, struct dentry *dentry, int mode)
-{
- struct super_block *sb = dir->i_sb;
- struct inode *inode;
- struct fat_slot_info sinfo;
- struct timespec ts;
- int err, cluster;
-
- lock_super(sb);
-
- ts = CURRENT_TIME_SEC;
- cluster = fat_alloc_new_dir(dir, &ts);
- if (cluster < 0) {
- err = cluster;
- goto out;
- }
- err = vfat_add_entry(dir, &dentry->d_name, 1, cluster, &ts, &sinfo);
- if (err)
- goto out_free;
- dir->i_version++;
- inc_nlink(dir);
-
- inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
- brelse(sinfo.bh);
- if (IS_ERR(inode)) {
- err = PTR_ERR(inode);
- /* the directory was completed, just return a error */
- goto out;
- }
- inode->i_version++;
- inode->i_nlink = 2;
- inode->i_mtime = inode->i_atime = inode->i_ctime = ts;
- /* timestamp is already written, so mark_inode_dirty() is unneeded. */
-
- dentry->d_time = dentry->d_parent->d_inode->i_version;
- d_instantiate(dentry, inode);
-
- unlock_super(sb);
- return 0;
-
-out_free:
- fat_free_clusters(dir, cluster);
-out:
- unlock_super(sb);
- return err;
-}
-
-static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry)
-{
- struct buffer_head *dotdot_bh;
- struct msdos_dir_entry *dotdot_de;
- struct inode *old_inode, *new_inode;
- struct fat_slot_info old_sinfo, sinfo;
- struct timespec ts;
- loff_t dotdot_i_pos, new_i_pos;
- int err, is_dir, update_dotdot, corrupt = 0;
- struct super_block *sb = old_dir->i_sb;
-
- old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
- old_inode = old_dentry->d_inode;
- new_inode = new_dentry->d_inode;
- lock_super(sb);
- err = vfat_find(old_dir, &old_dentry->d_name, &old_sinfo);
- if (err)
- goto out;
-
- is_dir = S_ISDIR(old_inode->i_mode);
- update_dotdot = (is_dir && old_dir != new_dir);
- if (update_dotdot) {
- if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de,
- &dotdot_i_pos) < 0) {
- err = -EIO;
- goto out;
- }
- }
-
- ts = CURRENT_TIME_SEC;
- if (new_inode) {
- if (is_dir) {
- err = fat_dir_empty(new_inode);
- if (err)
- goto out;
- }
- new_i_pos = MSDOS_I(new_inode)->i_pos;
- fat_detach(new_inode);
- } else {
- err = vfat_add_entry(new_dir, &new_dentry->d_name, is_dir, 0,
- &ts, &sinfo);
- if (err)
- goto out;
- new_i_pos = sinfo.i_pos;
- }
- new_dir->i_version++;
-
- fat_detach(old_inode);
- fat_attach(old_inode, new_i_pos);
- if (IS_DIRSYNC(new_dir)) {
- err = fat_sync_inode(old_inode);
- if (err)
- goto error_inode;
- } else
- mark_inode_dirty(old_inode);
-
- if (update_dotdot) {
- int start = MSDOS_I(new_dir)->i_logstart;
- dotdot_de->start = cpu_to_le16(start);
- dotdot_de->starthi = cpu_to_le16(start >> 16);
- mark_buffer_dirty(dotdot_bh);
- if (IS_DIRSYNC(new_dir)) {
- err = sync_dirty_buffer(dotdot_bh);
- if (err)
- goto error_dotdot;
- }
- drop_nlink(old_dir);
- if (!new_inode)
- inc_nlink(new_dir);
- }
-
- err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */
- old_sinfo.bh = NULL;
- if (err)
- goto error_dotdot;
- old_dir->i_version++;
- old_dir->i_ctime = old_dir->i_mtime = ts;
- if (IS_DIRSYNC(old_dir))
- (void)fat_sync_inode(old_dir);
- else
- mark_inode_dirty(old_dir);
-
- if (new_inode) {
- drop_nlink(new_inode);
- if (is_dir)
- drop_nlink(new_inode);
- new_inode->i_ctime = ts;
- }
-out:
- brelse(sinfo.bh);
- brelse(dotdot_bh);
- brelse(old_sinfo.bh);
- unlock_super(sb);
-
- return err;
-
-error_dotdot:
- /* data cluster is shared, serious corruption */
- corrupt = 1;
-
- if (update_dotdot) {
- int start = MSDOS_I(old_dir)->i_logstart;
- dotdot_de->start = cpu_to_le16(start);
- dotdot_de->starthi = cpu_to_le16(start >> 16);
- mark_buffer_dirty(dotdot_bh);
- corrupt |= sync_dirty_buffer(dotdot_bh);
- }
-error_inode:
- fat_detach(old_inode);
- fat_attach(old_inode, old_sinfo.i_pos);
- if (new_inode) {
- fat_attach(new_inode, new_i_pos);
- if (corrupt)
- corrupt |= fat_sync_inode(new_inode);
- } else {
- /*
- * If new entry was not sharing the data cluster, it
- * shouldn't be serious corruption.
- */
- int err2 = fat_remove_entries(new_dir, &sinfo);
- if (corrupt)
- corrupt |= err2;
- sinfo.bh = NULL;
- }
- if (corrupt < 0) {
- fat_fs_panic(new_dir->i_sb,
- "%s: Filesystem corrupted (i_pos %lld)",
- __func__, sinfo.i_pos);
- }
- goto out;
-}
-
-static const 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_setattr,
- .getattr = fat_getattr,
-};
-
-static 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;
-}
-
-static int vfat_get_sb(struct file_system_type *fs_type,
- int flags, const char *dev_name,
- void *data, struct vfsmount *mnt)
-{
- return get_sb_bdev(fs_type, flags, dev_name, data, vfat_fill_super,
- mnt);
-}
-
-static struct file_system_type vfat_fs_type = {
- .owner = THIS_MODULE,
- .name = "vfat",
- .get_sb = vfat_get_sb,
- .kill_sb = kill_block_super,
- .fs_flags = FS_REQUIRES_DEV,
-};
-
-static int __init init_vfat_fs(void)
-{
- return register_filesystem(&vfat_fs_type);
-}
-
-static void __exit exit_vfat_fs(void)
-{
- unregister_filesystem(&vfat_fs_type);
-}
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("VFAT filesystem support");
-MODULE_AUTHOR("Gordon Chaffee");
-
-module_init(init_vfat_fs)
-module_exit(exit_vfat_fs)
projects / linux-2.6-block.git / blobdiff