Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/fs/fat/Makefile b/fs/fat/Makefile
new file mode 100644
index 0000000..bfb5f06
--- /dev/null
+++ b/fs/fat/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the Linux fat filesystem support.
+#
+
+obj-$(CONFIG_FAT_FS) += fat.o
+
+fat-objs := cache.o dir.o fatent.o file.o inode.o misc.o
diff --git a/fs/fat/cache.c b/fs/fat/cache.c
new file mode 100644
index 0000000..7c52e46
--- /dev/null
+++ b/fs/fat/cache.c
@@ -0,0 +1,324 @@
+/*
+ * linux/fs/fat/cache.c
+ *
+ * Written 1992,1993 by Werner Almesberger
+ *
+ * Mar 1999. AV. Changed cache, so that it uses the starting cluster instead
+ * of inode number.
+ * May 1999. AV. Fixed the bogosity with FAT32 (read "FAT28"). Fscking lusers.
+ */
+
+#include <linux/fs.h>
+#include <linux/msdos_fs.h>
+#include <linux/buffer_head.h>
+
+/* this must be > 0. */
+#define FAT_MAX_CACHE 8
+
+struct fat_cache {
+ struct list_head cache_list;
+ int nr_contig; /* number of contiguous clusters */
+ int fcluster; /* cluster number in the file. */
+ int dcluster; /* cluster number on disk. */
+};
+
+struct fat_cache_id {
+ unsigned int id;
+ int nr_contig;
+ int fcluster;
+ int dcluster;
+};
+
+static inline int fat_max_cache(struct inode *inode)
+{
+ return FAT_MAX_CACHE;
+}
+
+static kmem_cache_t *fat_cache_cachep;
+
+static void init_once(void *foo, kmem_cache_t *cachep, unsigned long flags)
+{
+ struct fat_cache *cache = (struct fat_cache *)foo;
+
+ if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+ SLAB_CTOR_CONSTRUCTOR)
+ INIT_LIST_HEAD(&cache->cache_list);
+}
+
+int __init fat_cache_init(void)
+{
+ fat_cache_cachep = kmem_cache_create("fat_cache",
+ sizeof(struct fat_cache),
+ 0, SLAB_RECLAIM_ACCOUNT,
+ init_once, NULL);
+ if (fat_cache_cachep == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+void __exit fat_cache_destroy(void)
+{
+ if (kmem_cache_destroy(fat_cache_cachep))
+ printk(KERN_INFO "fat_cache: not all structures were freed\n");
+}
+
+static inline struct fat_cache *fat_cache_alloc(struct inode *inode)
+{
+ return kmem_cache_alloc(fat_cache_cachep, SLAB_KERNEL);
+}
+
+static inline void fat_cache_free(struct fat_cache *cache)
+{
+ BUG_ON(!list_empty(&cache->cache_list));
+ kmem_cache_free(fat_cache_cachep, cache);
+}
+
+static inline void fat_cache_update_lru(struct inode *inode,
+ struct fat_cache *cache)
+{
+ if (MSDOS_I(inode)->cache_lru.next != &cache->cache_list)
+ list_move(&cache->cache_list, &MSDOS_I(inode)->cache_lru);
+}
+
+static int fat_cache_lookup(struct inode *inode, int fclus,
+ struct fat_cache_id *cid,
+ int *cached_fclus, int *cached_dclus)
+{
+ static struct fat_cache nohit = { .fcluster = 0, };
+
+ struct fat_cache *hit = &nohit, *p;
+ int offset = -1;
+
+ spin_lock(&MSDOS_I(inode)->cache_lru_lock);
+ list_for_each_entry(p, &MSDOS_I(inode)->cache_lru, cache_list) {
+ /* Find the cache of "fclus" or nearest cache. */
+ if (p->fcluster <= fclus && hit->fcluster < p->fcluster) {
+ hit = p;
+ if ((hit->fcluster + hit->nr_contig) < fclus) {
+ offset = hit->nr_contig;
+ } else {
+ offset = fclus - hit->fcluster;
+ break;
+ }
+ }
+ }
+ if (hit != &nohit) {
+ fat_cache_update_lru(inode, hit);
+
+ cid->id = MSDOS_I(inode)->cache_valid_id;
+ cid->nr_contig = hit->nr_contig;
+ cid->fcluster = hit->fcluster;
+ cid->dcluster = hit->dcluster;
+ *cached_fclus = cid->fcluster + offset;
+ *cached_dclus = cid->dcluster + offset;
+ }
+ spin_unlock(&MSDOS_I(inode)->cache_lru_lock);
+
+ return offset;
+}
+
+static struct fat_cache *fat_cache_merge(struct inode *inode,
+ struct fat_cache_id *new)
+{
+ struct fat_cache *p;
+
+ list_for_each_entry(p, &MSDOS_I(inode)->cache_lru, cache_list) {
+ /* Find the same part as "new" in cluster-chain. */
+ if (p->fcluster == new->fcluster) {
+ BUG_ON(p->dcluster != new->dcluster);
+ if (new->nr_contig > p->nr_contig)
+ p->nr_contig = new->nr_contig;
+ return p;
+ }
+ }
+ return NULL;
+}
+
+static void fat_cache_add(struct inode *inode, struct fat_cache_id *new)
+{
+ struct fat_cache *cache, *tmp;
+
+ if (new->fcluster == -1) /* dummy cache */
+ return;
+
+ spin_lock(&MSDOS_I(inode)->cache_lru_lock);
+ if (new->id != FAT_CACHE_VALID &&
+ new->id != MSDOS_I(inode)->cache_valid_id)
+ goto out; /* this cache was invalidated */
+
+ cache = fat_cache_merge(inode, new);
+ if (cache == NULL) {
+ if (MSDOS_I(inode)->nr_caches < fat_max_cache(inode)) {
+ MSDOS_I(inode)->nr_caches++;
+ spin_unlock(&MSDOS_I(inode)->cache_lru_lock);
+
+ tmp = fat_cache_alloc(inode);
+ spin_lock(&MSDOS_I(inode)->cache_lru_lock);
+ cache = fat_cache_merge(inode, new);
+ if (cache != NULL) {
+ MSDOS_I(inode)->nr_caches--;
+ fat_cache_free(tmp);
+ goto out_update_lru;
+ }
+ cache = tmp;
+ } else {
+ struct list_head *p = MSDOS_I(inode)->cache_lru.prev;
+ cache = list_entry(p, struct fat_cache, cache_list);
+ }
+ cache->fcluster = new->fcluster;
+ cache->dcluster = new->dcluster;
+ cache->nr_contig = new->nr_contig;
+ }
+out_update_lru:
+ fat_cache_update_lru(inode, cache);
+out:
+ spin_unlock(&MSDOS_I(inode)->cache_lru_lock);
+}
+
+/*
+ * Cache invalidation occurs rarely, thus the LRU chain is not updated. It
+ * fixes itself after a while.
+ */
+static void __fat_cache_inval_inode(struct inode *inode)
+{
+ struct msdos_inode_info *i = MSDOS_I(inode);
+ struct fat_cache *cache;
+
+ while (!list_empty(&i->cache_lru)) {
+ cache = list_entry(i->cache_lru.next, struct fat_cache, cache_list);
+ list_del_init(&cache->cache_list);
+ i->nr_caches--;
+ fat_cache_free(cache);
+ }
+ /* Update. The copy of caches before this id is discarded. */
+ i->cache_valid_id++;
+ if (i->cache_valid_id == FAT_CACHE_VALID)
+ i->cache_valid_id++;
+}
+
+void fat_cache_inval_inode(struct inode *inode)
+{
+ spin_lock(&MSDOS_I(inode)->cache_lru_lock);
+ __fat_cache_inval_inode(inode);
+ spin_unlock(&MSDOS_I(inode)->cache_lru_lock);
+}
+
+static inline int cache_contiguous(struct fat_cache_id *cid, int dclus)
+{
+ cid->nr_contig++;
+ return ((cid->dcluster + cid->nr_contig) == dclus);
+}
+
+static inline void cache_init(struct fat_cache_id *cid, int fclus, int dclus)
+{
+ cid->id = FAT_CACHE_VALID;
+ cid->fcluster = fclus;
+ cid->dcluster = dclus;
+ cid->nr_contig = 0;
+}
+
+int fat_get_cluster(struct inode *inode, int cluster, int *fclus, int *dclus)
+{
+ struct super_block *sb = inode->i_sb;
+ const int limit = sb->s_maxbytes >> MSDOS_SB(sb)->cluster_bits;
+ struct fat_entry fatent;
+ struct fat_cache_id cid;
+ int nr;
+
+ BUG_ON(MSDOS_I(inode)->i_start == 0);
+
+ *fclus = 0;
+ *dclus = MSDOS_I(inode)->i_start;
+ if (cluster == 0)
+ return 0;
+
+ if (fat_cache_lookup(inode, cluster, &cid, fclus, dclus) < 0) {
+ /*
+ * dummy, always not contiguous
+ * This is reinitialized by cache_init(), later.
+ */
+ cache_init(&cid, -1, -1);
+ }
+
+ fatent_init(&fatent);
+ while (*fclus < cluster) {
+ /* prevent the infinite loop of cluster chain */
+ if (*fclus > limit) {
+ fat_fs_panic(sb, "%s: detected the cluster chain loop"
+ " (i_pos %lld)", __FUNCTION__,
+ MSDOS_I(inode)->i_pos);
+ nr = -EIO;
+ goto out;
+ }
+
+ nr = fat_ent_read(inode, &fatent, *dclus);
+ if (nr < 0)
+ goto out;
+ else if (nr == FAT_ENT_FREE) {
+ fat_fs_panic(sb, "%s: invalid cluster chain"
+ " (i_pos %lld)", __FUNCTION__,
+ MSDOS_I(inode)->i_pos);
+ nr = -EIO;
+ goto out;
+ } else if (nr == FAT_ENT_EOF) {
+ fat_cache_add(inode, &cid);
+ goto out;
+ }
+ (*fclus)++;
+ *dclus = nr;
+ if (!cache_contiguous(&cid, *dclus))
+ cache_init(&cid, *fclus, *dclus);
+ }
+ nr = 0;
+ fat_cache_add(inode, &cid);
+out:
+ fatent_brelse(&fatent);
+ return nr;
+}
+
+static int fat_bmap_cluster(struct inode *inode, int cluster)
+{
+ struct super_block *sb = inode->i_sb;
+ int ret, fclus, dclus;
+
+ if (MSDOS_I(inode)->i_start == 0)
+ return 0;
+
+ ret = fat_get_cluster(inode, cluster, &fclus, &dclus);
+ if (ret < 0)
+ return ret;
+ else if (ret == FAT_ENT_EOF) {
+ fat_fs_panic(sb, "%s: request beyond EOF (i_pos %lld)",
+ __FUNCTION__, MSDOS_I(inode)->i_pos);
+ return -EIO;
+ }
+ return dclus;
+}
+
+int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys)
+{
+ struct super_block *sb = inode->i_sb;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ sector_t last_block;
+ int cluster, offset;
+
+ *phys = 0;
+ if ((sbi->fat_bits != 32) && (inode->i_ino == MSDOS_ROOT_INO)) {
+ if (sector < (sbi->dir_entries >> sbi->dir_per_block_bits))
+ *phys = sector + sbi->dir_start;
+ return 0;
+ }
+ last_block = (MSDOS_I(inode)->mmu_private + (sb->s_blocksize - 1))
+ >> sb->s_blocksize_bits;
+ if (sector >= last_block)
+ return 0;
+
+ cluster = sector >> (sbi->cluster_bits - sb->s_blocksize_bits);
+ offset = sector & (sbi->sec_per_clus - 1);
+ cluster = fat_bmap_cluster(inode, cluster);
+ if (cluster < 0)
+ return cluster;
+ else if (cluster)
+ *phys = fat_clus_to_blknr(sbi, cluster) + offset;
+ return 0;
+}
diff --git a/fs/fat/dir.c b/fs/fat/dir.c
new file mode 100644
index 0000000..e5ae1b7
--- /dev/null
+++ b/fs/fat/dir.c
@@ -0,0 +1,1271 @@
+/*
+ * linux/fs/fat/dir.c
+ *
+ * directory handling functions for fat-based filesystems
+ *
+ * Written 1992,1993 by Werner Almesberger
+ *
+ * Hidden files 1995 by Albert Cahalan <albert@ccs.neu.edu> <adc@coe.neu.edu>
+ *
+ * VFAT extensions by Gordon Chaffee <chaffee@plateau.cs.berkeley.edu>
+ * Merged with msdos fs by Henrik Storner <storner@osiris.ping.dk>
+ * Rewritten for constant inumbers. Plugged buffer overrun in readdir(). AV
+ * Short name translation 1999, 2001 by Wolfram Pienkoss <wp@bszh.de>
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/msdos_fs.h>
+#include <linux/dirent.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>
+#include <asm/uaccess.h>
+
+static inline loff_t fat_make_i_pos(struct super_block *sb,
+ struct buffer_head *bh,
+ struct msdos_dir_entry *de)
+{
+ return ((loff_t)bh->b_blocknr << MSDOS_SB(sb)->dir_per_block_bits)
+ | (de - (struct msdos_dir_entry *)bh->b_data);
+}
+
+/* Returns the inode number of the directory entry at offset pos. If bh is
+ non-NULL, it is brelse'd before. Pos is incremented. The buffer header is
+ returned in bh.
+ AV. Most often we do it item-by-item. Makes sense to optimize.
+ AV. OK, there we go: if both bh and de are non-NULL we assume that we just
+ AV. want the next entry (took one explicit de=NULL in vfat/namei.c).
+ AV. It's done in fat_get_entry() (inlined), here the slow case lives.
+ AV. Additionally, when we return -1 (i.e. reached the end of directory)
+ AV. we make bh NULL.
+ */
+static int fat__get_entry(struct inode *dir, loff_t *pos,
+ struct buffer_head **bh, struct msdos_dir_entry **de)
+{
+ struct super_block *sb = dir->i_sb;
+ sector_t phys, iblock;
+ int offset;
+ int err;
+
+next:
+ if (*bh)
+ brelse(*bh);
+
+ *bh = NULL;
+ iblock = *pos >> sb->s_blocksize_bits;
+ err = fat_bmap(dir, iblock, &phys);
+ if (err || !phys)
+ return -1; /* beyond EOF or error */
+
+ *bh = sb_bread(sb, phys);
+ if (*bh == NULL) {
+ printk(KERN_ERR "FAT: Directory bread(block %llu) failed\n",
+ (unsigned long long)phys);
+ /* skip this block */
+ *pos = (iblock + 1) << sb->s_blocksize_bits;
+ goto next;
+ }
+
+ offset = *pos & (sb->s_blocksize - 1);
+ *pos += sizeof(struct msdos_dir_entry);
+ *de = (struct msdos_dir_entry *)((*bh)->b_data + offset);
+
+ return 0;
+}
+
+static inline int fat_get_entry(struct inode *dir, loff_t *pos,
+ struct buffer_head **bh,
+ struct msdos_dir_entry **de)
+{
+ /* Fast stuff first */
+ if (*bh && *de &&
+ (*de - (struct msdos_dir_entry *)(*bh)->b_data) < MSDOS_SB(dir->i_sb)->dir_per_block - 1) {
+ *pos += sizeof(struct msdos_dir_entry);
+ (*de)++;
+ return 0;
+ }
+ return fat__get_entry(dir, pos, bh, de);
+}
+
+/*
+ * Convert Unicode 16 to UTF8, translated Unicode, or ASCII.
+ * If uni_xlate is enabled and we can't get a 1:1 conversion, use a
+ * colon as an escape character since it is normally invalid on the vfat
+ * filesystem. The following four characters are the hexadecimal digits
+ * of Unicode value. This lets us do a full dump and restore of Unicode
+ * filenames. We could get into some trouble with long Unicode names,
+ * but ignore that right now.
+ * Ahem... Stack smashing in ring 0 isn't fun. Fixed.
+ */
+static int uni16_to_x8(unsigned char *ascii, wchar_t *uni, int uni_xlate,
+ struct nls_table *nls)
+{
+ wchar_t *ip, ec;
+ unsigned char *op, nc;
+ int charlen;
+ int k;
+
+ ip = uni;
+ op = ascii;
+
+ while (*ip) {
+ ec = *ip++;
+ if ( (charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE)) > 0) {
+ op += charlen;
+ } else {
+ if (uni_xlate == 1) {
+ *op = ':';
+ for (k = 4; k > 0; k--) {
+ nc = ec & 0xF;
+ op[k] = nc > 9 ? nc + ('a' - 10)
+ : nc + '0';
+ ec >>= 4;
+ }
+ op += 5;
+ } else {
+ *op++ = '?';
+ }
+ }
+ /* We have some slack there, so it's OK */
+ if (op>ascii+256) {
+ op = ascii + 256;
+ break;
+ }
+ }
+ *op = 0;
+ return (op - ascii);
+}
+
+static inline int
+fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
+{
+ int charlen;
+
+ charlen = t->char2uni(c, clen, uni);
+ if (charlen < 0) {
+ *uni = 0x003f; /* a question mark */
+ charlen = 1;
+ }
+ return charlen;
+}
+
+static inline int
+fat_short2lower_uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
+{
+ int charlen;
+ wchar_t wc;
+
+ charlen = t->char2uni(c, clen, &wc);
+ if (charlen < 0) {
+ *uni = 0x003f; /* a question mark */
+ charlen = 1;
+ } else if (charlen <= 1) {
+ unsigned char nc = t->charset2lower[*c];
+
+ if (!nc)
+ nc = *c;
+
+ if ( (charlen = t->char2uni(&nc, 1, uni)) < 0) {
+ *uni = 0x003f; /* a question mark */
+ charlen = 1;
+ }
+ } else
+ *uni = wc;
+
+ return charlen;
+}
+
+static inline int
+fat_shortname2uni(struct nls_table *nls, unsigned char *buf, int buf_size,
+ wchar_t *uni_buf, unsigned short opt, int lower)
+{
+ int len = 0;
+
+ if (opt & VFAT_SFN_DISPLAY_LOWER)
+ len = fat_short2lower_uni(nls, buf, buf_size, uni_buf);
+ else if (opt & VFAT_SFN_DISPLAY_WIN95)
+ len = fat_short2uni(nls, buf, buf_size, uni_buf);
+ else if (opt & VFAT_SFN_DISPLAY_WINNT) {
+ if (lower)
+ len = fat_short2lower_uni(nls, buf, buf_size, uni_buf);
+ else
+ len = fat_short2uni(nls, buf, buf_size, uni_buf);
+ } else
+ len = fat_short2uni(nls, buf, buf_size, uni_buf);
+
+ return len;
+}
+
+/*
+ * Return values: negative -> error, 0 -> not found, positive -> found,
+ * value is the total amount of slots, including the shortname entry.
+ */
+int fat_search_long(struct inode *inode, const unsigned char *name,
+ int name_len, struct fat_slot_info *sinfo)
+{
+ struct super_block *sb = inode->i_sb;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ struct buffer_head *bh = NULL;
+ struct msdos_dir_entry *de;
+ struct nls_table *nls_io = sbi->nls_io;
+ struct nls_table *nls_disk = sbi->nls_disk;
+ wchar_t bufuname[14];
+ unsigned char xlate_len, nr_slots;
+ wchar_t *unicode = NULL;
+ unsigned char work[8], bufname[260]; /* 256 + 4 */
+ int uni_xlate = sbi->options.unicode_xlate;
+ int utf8 = sbi->options.utf8;
+ int anycase = (sbi->options.name_check != 's');
+ unsigned short opt_shortname = sbi->options.shortname;
+ loff_t cpos = 0;
+ int chl, i, j, last_u, err;
+
+ err = -ENOENT;
+ while(1) {
+ if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
+ goto EODir;
+parse_record:
+ nr_slots = 0;
+ if (de->name[0] == DELETED_FLAG)
+ continue;
+ if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
+ continue;
+ if (de->attr != ATTR_EXT && IS_FREE(de->name))
+ continue;
+ if (de->attr == ATTR_EXT) {
+ struct msdos_dir_slot *ds;
+ unsigned char id;
+ unsigned char slot;
+ unsigned char slots;
+ unsigned char sum;
+ unsigned char alias_checksum;
+
+ if (!unicode) {
+ unicode = (wchar_t *)
+ __get_free_page(GFP_KERNEL);
+ if (!unicode) {
+ brelse(bh);
+ return -ENOMEM;
+ }
+ }
+parse_long:
+ slots = 0;
+ ds = (struct msdos_dir_slot *) de;
+ id = ds->id;
+ if (!(id & 0x40))
+ continue;
+ slots = id & ~0x40;
+ if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */
+ continue;
+ nr_slots = slots;
+ alias_checksum = ds->alias_checksum;
+
+ slot = slots;
+ while (1) {
+ int offset;
+
+ slot--;
+ offset = slot * 13;
+ fat16_towchar(unicode + offset, ds->name0_4, 5);
+ fat16_towchar(unicode + offset + 5, ds->name5_10, 6);
+ fat16_towchar(unicode + offset + 11, ds->name11_12, 2);
+
+ if (ds->id & 0x40) {
+ unicode[offset + 13] = 0;
+ }
+ if (fat_get_entry(inode, &cpos, &bh, &de) < 0)
+ goto EODir;
+ if (slot == 0)
+ break;
+ ds = (struct msdos_dir_slot *) de;
+ if (ds->attr != ATTR_EXT)
+ goto parse_record;
+ if ((ds->id & ~0x40) != slot)
+ goto parse_long;
+ if (ds->alias_checksum != alias_checksum)
+ goto parse_long;
+ }
+ if (de->name[0] == DELETED_FLAG)
+ continue;
+ if (de->attr == ATTR_EXT)
+ goto parse_long;
+ if (IS_FREE(de->name) || (de->attr & ATTR_VOLUME))
+ continue;
+ for (sum = 0, i = 0; i < 11; i++)
+ sum = (((sum&1)<<7)|((sum&0xfe)>>1)) + de->name[i];
+ if (sum != alias_checksum)
+ nr_slots = 0;
+ }
+
+ memcpy(work, de->name, sizeof(de->name));
+ /* see namei.c, msdos_format_name */
+ if (work[0] == 0x05)
+ work[0] = 0xE5;
+ for (i = 0, j = 0, last_u = 0; i < 8;) {
+ if (!work[i]) break;
+ chl = fat_shortname2uni(nls_disk, &work[i], 8 - i,
+ &bufuname[j++], opt_shortname,
+ de->lcase & CASE_LOWER_BASE);
+ if (chl <= 1) {
+ if (work[i] != ' ')
+ last_u = j;
+ } else {
+ last_u = j;
+ }
+ i += chl;
+ }
+ j = last_u;
+ fat_short2uni(nls_disk, ".", 1, &bufuname[j++]);
+ for (i = 0; i < 3;) {
+ if (!de->ext[i]) break;
+ chl = fat_shortname2uni(nls_disk, &de->ext[i], 3 - i,
+ &bufuname[j++], opt_shortname,
+ de->lcase & CASE_LOWER_EXT);
+ if (chl <= 1) {
+ if (de->ext[i] != ' ')
+ last_u = j;
+ } else {
+ last_u = j;
+ }
+ i += chl;
+ }
+ if (!last_u)
+ continue;
+
+ bufuname[last_u] = 0x0000;
+ xlate_len = utf8
+ ?utf8_wcstombs(bufname, bufuname, sizeof(bufname))
+ :uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
+ if (xlate_len == name_len)
+ if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
+ (anycase && !nls_strnicmp(nls_io, name, bufname,
+ xlate_len)))
+ goto Found;
+
+ if (nr_slots) {
+ xlate_len = utf8
+ ?utf8_wcstombs(bufname, unicode, sizeof(bufname))
+ :uni16_to_x8(bufname, unicode, uni_xlate, nls_io);
+ if (xlate_len != name_len)
+ continue;
+ if ((!anycase && !memcmp(name, bufname, xlate_len)) ||
+ (anycase && !nls_strnicmp(nls_io, name, bufname,
+ xlate_len)))
+ goto Found;
+ }
+ }
+
+Found:
+ nr_slots++; /* include the de */
+ sinfo->slot_off = cpos - nr_slots * sizeof(*de);
+ sinfo->nr_slots = nr_slots;
+ sinfo->de = de;
+ sinfo->bh = bh;
+ sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
+ err = 0;
+EODir:
+ if (unicode)
+ free_page((unsigned long)unicode);
+
+ return err;
+}
+
+EXPORT_SYMBOL(fat_search_long);
+
+struct fat_ioctl_filldir_callback {
+ struct dirent __user *dirent;
+ int result;
+ /* for dir ioctl */
+ const char *longname;
+ int long_len;
+ const char *shortname;
+ int short_len;
+};
+
+static int fat_readdirx(struct inode *inode, struct file *filp, void *dirent,
+ filldir_t filldir, int short_only, int both)
+{
+ struct super_block *sb = inode->i_sb;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ struct buffer_head *bh;
+ struct msdos_dir_entry *de;
+ struct nls_table *nls_io = sbi->nls_io;
+ struct nls_table *nls_disk = sbi->nls_disk;
+ unsigned char long_slots;
+ const char *fill_name;
+ int fill_len;
+ wchar_t bufuname[14];
+ wchar_t *unicode = NULL;
+ unsigned char c, work[8], bufname[56], *ptname = bufname;
+ unsigned long lpos, dummy, *furrfu = &lpos;
+ int uni_xlate = sbi->options.unicode_xlate;
+ int isvfat = sbi->options.isvfat;
+ int utf8 = sbi->options.utf8;
+ int nocase = sbi->options.nocase;
+ unsigned short opt_shortname = sbi->options.shortname;
+ unsigned long inum;
+ int chi, chl, i, i2, j, last, last_u, dotoffset = 0;
+ loff_t cpos;
+ int ret = 0;
+
+ lock_kernel();
+
+ cpos = filp->f_pos;
+ /* Fake . and .. for the root directory. */
+ if (inode->i_ino == MSDOS_ROOT_INO) {
+ while (cpos < 2) {
+ if (filldir(dirent, "..", cpos+1, cpos, MSDOS_ROOT_INO, DT_DIR) < 0)
+ goto out;
+ cpos++;
+ filp->f_pos++;
+ }
+ if (cpos == 2) {
+ dummy = 2;
+ furrfu = &dummy;
+ cpos = 0;
+ }
+ }
+ if (cpos & (sizeof(struct msdos_dir_entry)-1)) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ bh = NULL;
+GetNew:
+ long_slots = 0;
+ if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
+ goto EODir;
+ /* Check for long filename entry */
+ if (isvfat) {
+ if (de->name[0] == DELETED_FLAG)
+ goto RecEnd;
+ if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
+ goto RecEnd;
+ if (de->attr != ATTR_EXT && IS_FREE(de->name))
+ goto RecEnd;
+ } else {
+ if ((de->attr & ATTR_VOLUME) || IS_FREE(de->name))
+ goto RecEnd;
+ }
+
+ if (isvfat && de->attr == ATTR_EXT) {
+ struct msdos_dir_slot *ds;
+ unsigned char id;
+ unsigned char slot;
+ unsigned char slots;
+ unsigned char sum;
+ unsigned char alias_checksum;
+
+ if (!unicode) {
+ unicode = (wchar_t *)__get_free_page(GFP_KERNEL);
+ if (!unicode) {
+ filp->f_pos = cpos;
+ brelse(bh);
+ ret = -ENOMEM;
+ goto out;
+ }
+ }
+ParseLong:
+ slots = 0;
+ ds = (struct msdos_dir_slot *) de;
+ id = ds->id;
+ if (!(id & 0x40))
+ goto RecEnd;
+ slots = id & ~0x40;
+ if (slots > 20 || !slots) /* ceil(256 * 2 / 26) */
+ goto RecEnd;
+ long_slots = slots;
+ alias_checksum = ds->alias_checksum;
+
+ slot = slots;
+ while (1) {
+ int offset;
+
+ slot--;
+ offset = slot * 13;
+ fat16_towchar(unicode + offset, ds->name0_4, 5);
+ fat16_towchar(unicode + offset + 5, ds->name5_10, 6);
+ fat16_towchar(unicode + offset + 11, ds->name11_12, 2);
+
+ if (ds->id & 0x40) {
+ unicode[offset + 13] = 0;
+ }
+ if (fat_get_entry(inode, &cpos, &bh, &de) == -1)
+ goto EODir;
+ if (slot == 0)
+ break;
+ ds = (struct msdos_dir_slot *) de;
+ if (ds->attr != ATTR_EXT)
+ goto RecEnd; /* XXX */
+ if ((ds->id & ~0x40) != slot)
+ goto ParseLong;
+ if (ds->alias_checksum != alias_checksum)
+ goto ParseLong;
+ }
+ if (de->name[0] == DELETED_FLAG)
+ goto RecEnd;
+ if (de->attr == ATTR_EXT)
+ goto ParseLong;
+ if (IS_FREE(de->name) || (de->attr & ATTR_VOLUME))
+ goto RecEnd;
+ for (sum = 0, i = 0; i < 11; i++)
+ sum = (((sum&1)<<7)|((sum&0xfe)>>1)) + de->name[i];
+ if (sum != alias_checksum)
+ long_slots = 0;
+ }
+
+ if (sbi->options.dotsOK) {
+ ptname = bufname;
+ dotoffset = 0;
+ if (de->attr & ATTR_HIDDEN) {
+ *ptname++ = '.';
+ dotoffset = 1;
+ }
+ }
+
+ memcpy(work, de->name, sizeof(de->name));
+ /* see namei.c, msdos_format_name */
+ if (work[0] == 0x05)
+ work[0] = 0xE5;
+ for (i = 0, j = 0, last = 0, last_u = 0; i < 8;) {
+ if (!(c = work[i])) break;
+ chl = fat_shortname2uni(nls_disk, &work[i], 8 - i,
+ &bufuname[j++], opt_shortname,
+ de->lcase & CASE_LOWER_BASE);
+ if (chl <= 1) {
+ ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c;
+ if (c != ' ') {
+ last = i;
+ last_u = j;
+ }
+ } else {
+ last_u = j;
+ for (chi = 0; chi < chl && i < 8; chi++) {
+ ptname[i] = work[i];
+ i++; last = i;
+ }
+ }
+ }
+ i = last;
+ j = last_u;
+ fat_short2uni(nls_disk, ".", 1, &bufuname[j++]);
+ ptname[i++] = '.';
+ for (i2 = 0; i2 < 3;) {
+ if (!(c = de->ext[i2])) break;
+ chl = fat_shortname2uni(nls_disk, &de->ext[i2], 3 - i2,
+ &bufuname[j++], opt_shortname,
+ de->lcase & CASE_LOWER_EXT);
+ if (chl <= 1) {
+ i2++;
+ ptname[i++] = (!nocase && c>='A' && c<='Z') ? c+32 : c;
+ if (c != ' ') {
+ last = i;
+ last_u = j;
+ }
+ } else {
+ last_u = j;
+ for (chi = 0; chi < chl && i2 < 3; chi++) {
+ ptname[i++] = de->ext[i2++];
+ last = i;
+ }
+ }
+ }
+ if (!last)
+ goto RecEnd;
+
+ i = last + dotoffset;
+ j = last_u;
+
+ lpos = cpos - (long_slots+1)*sizeof(struct msdos_dir_entry);
+ if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME))
+ inum = inode->i_ino;
+ else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) {
+ inum = parent_ino(filp->f_dentry);
+ } else {
+ loff_t i_pos = fat_make_i_pos(sb, bh, de);
+ struct inode *tmp = fat_iget(sb, i_pos);
+ if (tmp) {
+ inum = tmp->i_ino;
+ iput(tmp);
+ } else
+ inum = iunique(sb, MSDOS_ROOT_INO);
+ }
+
+ if (isvfat) {
+ bufuname[j] = 0x0000;
+ i = utf8 ? utf8_wcstombs(bufname, bufuname, sizeof(bufname))
+ : uni16_to_x8(bufname, bufuname, uni_xlate, nls_io);
+ }
+
+ fill_name = bufname;
+ fill_len = i;
+ if (!short_only && long_slots) {
+ /* convert the unicode long name. 261 is maximum size
+ * of unicode buffer. (13 * slots + nul) */
+ void *longname = unicode + 261;
+ int buf_size = PAGE_SIZE - (261 * sizeof(unicode[0]));
+ int long_len = utf8
+ ? utf8_wcstombs(longname, unicode, buf_size)
+ : uni16_to_x8(longname, unicode, uni_xlate, nls_io);
+
+ if (!both) {
+ fill_name = longname;
+ fill_len = long_len;
+ } else {
+ /* hack for fat_ioctl_filldir() */
+ struct fat_ioctl_filldir_callback *p = dirent;
+
+ p->longname = longname;
+ p->long_len = long_len;
+ p->shortname = bufname;
+ p->short_len = i;
+ fill_name = NULL;
+ fill_len = 0;
+ }
+ }
+ if (filldir(dirent, fill_name, fill_len, *furrfu, inum,
+ (de->attr & ATTR_DIR) ? DT_DIR : DT_REG) < 0)
+ goto FillFailed;
+
+RecEnd:
+ furrfu = &lpos;
+ filp->f_pos = cpos;
+ goto GetNew;
+EODir:
+ filp->f_pos = cpos;
+FillFailed:
+ if (bh)
+ brelse(bh);
+ if (unicode)
+ free_page((unsigned long)unicode);
+out:
+ unlock_kernel();
+ return ret;
+}
+
+static int fat_readdir(struct file *filp, void *dirent, filldir_t filldir)
+{
+ struct inode *inode = filp->f_dentry->d_inode;
+ return fat_readdirx(inode, filp, dirent, filldir, 0, 0);
+}
+
+static int fat_ioctl_filldir(void *__buf, const char *name, int name_len,
+ loff_t offset, ino_t ino, unsigned int d_type)
+{
+ struct fat_ioctl_filldir_callback *buf = __buf;
+ struct dirent __user *d1 = buf->dirent;
+ struct dirent __user *d2 = d1 + 1;
+
+ if (buf->result)
+ return -EINVAL;
+ buf->result++;
+
+ if (name != NULL) {
+ /* dirent has only short name */
+ if (name_len >= sizeof(d1->d_name))
+ name_len = sizeof(d1->d_name) - 1;
+
+ if (put_user(0, d2->d_name) ||
+ put_user(0, &d2->d_reclen) ||
+ copy_to_user(d1->d_name, name, name_len) ||
+ put_user(0, d1->d_name + name_len) ||
+ put_user(name_len, &d1->d_reclen))
+ goto efault;
+ } else {
+ /* dirent has short and long name */
+ const char *longname = buf->longname;
+ int long_len = buf->long_len;
+ const char *shortname = buf->shortname;
+ int short_len = buf->short_len;
+
+ if (long_len >= sizeof(d1->d_name))
+ long_len = sizeof(d1->d_name) - 1;
+ if (short_len >= sizeof(d1->d_name))
+ short_len = sizeof(d1->d_name) - 1;
+
+ if (copy_to_user(d2->d_name, longname, long_len) ||
+ put_user(0, d2->d_name + long_len) ||
+ put_user(long_len, &d2->d_reclen) ||
+ put_user(ino, &d2->d_ino) ||
+ put_user(offset, &d2->d_off) ||
+ copy_to_user(d1->d_name, shortname, short_len) ||
+ put_user(0, d1->d_name + short_len) ||
+ put_user(short_len, &d1->d_reclen))
+ goto efault;
+ }
+ return 0;
+efault:
+ buf->result = -EFAULT;
+ return -EFAULT;
+}
+
+static int fat_dir_ioctl(struct inode * inode, struct file * filp,
+ unsigned int cmd, unsigned long arg)
+{
+ struct fat_ioctl_filldir_callback buf;
+ struct dirent __user *d1;
+ int ret, short_only, both;
+
+ switch (cmd) {
+ case VFAT_IOCTL_READDIR_SHORT:
+ short_only = 1;
+ both = 0;
+ break;
+ case VFAT_IOCTL_READDIR_BOTH:
+ short_only = 0;
+ both = 1;
+ break;
+ default:
+ return fat_generic_ioctl(inode, filp, cmd, arg);
+ }
+
+ d1 = (struct dirent __user *)arg;
+ if (!access_ok(VERIFY_WRITE, d1, sizeof(struct dirent[2])))
+ return -EFAULT;
+ /*
+ * Yes, we don't need this put_user() absolutely. However old
+ * code didn't return the right value. So, app use this value,
+ * in order to check whether it is EOF.
+ */
+ if (put_user(0, &d1->d_reclen))
+ return -EFAULT;
+
+ buf.dirent = d1;
+ buf.result = 0;
+ down(&inode->i_sem);
+ ret = -ENOENT;
+ if (!IS_DEADDIR(inode)) {
+ ret = fat_readdirx(inode, filp, &buf, fat_ioctl_filldir,
+ short_only, both);
+ }
+ up(&inode->i_sem);
+ if (ret >= 0)
+ ret = buf.result;
+ return ret;
+}
+
+struct file_operations fat_dir_operations = {
+ .read = generic_read_dir,
+ .readdir = fat_readdir,
+ .ioctl = fat_dir_ioctl,
+ .fsync = file_fsync,
+};
+
+static int fat_get_short_entry(struct inode *dir, loff_t *pos,
+ struct buffer_head **bh,
+ struct msdos_dir_entry **de)
+{
+ while (fat_get_entry(dir, pos, bh, de) >= 0) {
+ /* free entry or long name entry or volume label */
+ if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME))
+ return 0;
+ }
+ return -ENOENT;
+}
+
+/*
+ * The ".." entry can not provide the "struct fat_slot_info" informations
+ * for inode. So, this function provide the some informations only.
+ */
+int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
+ struct msdos_dir_entry **de, loff_t *i_pos)
+{
+ loff_t offset;
+
+ offset = 0;
+ *bh = NULL;
+ while (fat_get_short_entry(dir, &offset, bh, de) >= 0) {
+ if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) {
+ *i_pos = fat_make_i_pos(dir->i_sb, *bh, *de);
+ return 0;
+ }
+ }
+ return -ENOENT;
+}
+
+EXPORT_SYMBOL(fat_get_dotdot_entry);
+
+/* See if directory is empty */
+int fat_dir_empty(struct inode *dir)
+{
+ struct buffer_head *bh;
+ struct msdos_dir_entry *de;
+ loff_t cpos;
+ int result = 0;
+
+ bh = NULL;
+ cpos = 0;
+ while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) {
+ if (strncmp(de->name, MSDOS_DOT , MSDOS_NAME) &&
+ strncmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) {
+ result = -ENOTEMPTY;
+ break;
+ }
+ }
+ brelse(bh);
+ return result;
+}
+
+EXPORT_SYMBOL(fat_dir_empty);
+
+/*
+ * fat_subdirs counts the number of sub-directories of dir. It can be run
+ * on directories being created.
+ */
+int fat_subdirs(struct inode *dir)
+{
+ struct buffer_head *bh;
+ struct msdos_dir_entry *de;
+ loff_t cpos;
+ int count = 0;
+
+ bh = NULL;
+ cpos = 0;
+ while (fat_get_short_entry(dir, &cpos, &bh, &de) >= 0) {
+ if (de->attr & ATTR_DIR)
+ count++;
+ }
+ brelse(bh);
+ return count;
+}
+
+/*
+ * Scans a directory for a given file (name points to its formatted name).
+ * Returns an error code or zero.
+ */
+int fat_scan(struct inode *dir, const unsigned char *name,
+ struct fat_slot_info *sinfo)
+{
+ struct super_block *sb = dir->i_sb;
+
+ sinfo->slot_off = 0;
+ sinfo->bh = NULL;
+ while (fat_get_short_entry(dir, &sinfo->slot_off, &sinfo->bh,
+ &sinfo->de) >= 0) {
+ if (!strncmp(sinfo->de->name, name, MSDOS_NAME)) {
+ sinfo->slot_off -= sizeof(*sinfo->de);
+ sinfo->nr_slots = 1;
+ sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
+ return 0;
+ }
+ }
+ return -ENOENT;
+}
+
+EXPORT_SYMBOL(fat_scan);
+
+static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots)
+{
+ struct super_block *sb = dir->i_sb;
+ struct buffer_head *bh;
+ struct msdos_dir_entry *de, *endp;
+ int err = 0, orig_slots;
+
+ while (nr_slots) {
+ bh = NULL;
+ if (fat_get_entry(dir, &pos, &bh, &de) < 0) {
+ err = -EIO;
+ break;
+ }
+
+ orig_slots = nr_slots;
+ endp = (struct msdos_dir_entry *)(bh->b_data + sb->s_blocksize);
+ while (nr_slots && de < endp) {
+ de->name[0] = DELETED_FLAG;
+ de++;
+ nr_slots--;
+ }
+ mark_buffer_dirty(bh);
+ if (IS_DIRSYNC(dir))
+ err = sync_dirty_buffer(bh);
+ brelse(bh);
+ if (err)
+ break;
+
+ /* pos is *next* de's position, so this does `- sizeof(de)' */
+ pos += ((orig_slots - nr_slots) * sizeof(*de)) - sizeof(*de);
+ }
+
+ return err;
+}
+
+int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo)
+{
+ struct msdos_dir_entry *de;
+ struct buffer_head *bh;
+ int err = 0, nr_slots;
+
+ /*
+ * First stage: Remove the shortname. By this, the directory
+ * entry is removed.
+ */
+ nr_slots = sinfo->nr_slots;
+ de = sinfo->de;
+ sinfo->de = NULL;
+ bh = sinfo->bh;
+ sinfo->bh = NULL;
+ while (nr_slots && de >= (struct msdos_dir_entry *)bh->b_data) {
+ de->name[0] = DELETED_FLAG;
+ de--;
+ nr_slots--;
+ }
+ mark_buffer_dirty(bh);
+ if (IS_DIRSYNC(dir))
+ err = sync_dirty_buffer(bh);
+ brelse(bh);
+ if (err)
+ return err;
+ dir->i_version++;
+
+ if (nr_slots) {
+ /*
+ * Second stage: remove the remaining longname slots.
+ * (This directory entry is already removed, and so return
+ * the success)
+ */
+ err = __fat_remove_entries(dir, sinfo->slot_off, nr_slots);
+ if (err) {
+ printk(KERN_WARNING
+ "FAT: Couldn't remove the long name slots\n");
+ }
+ }
+
+ dir->i_mtime = dir->i_atime = CURRENT_TIME_SEC;
+ if (IS_DIRSYNC(dir))
+ (void)fat_sync_inode(dir);
+ else
+ mark_inode_dirty(dir);
+
+ return 0;
+}
+
+EXPORT_SYMBOL(fat_remove_entries);
+
+static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used,
+ struct buffer_head **bhs, int nr_bhs)
+{
+ struct super_block *sb = dir->i_sb;
+ sector_t last_blknr = blknr + MSDOS_SB(sb)->sec_per_clus;
+ int err, i, n;
+
+ /* Zeroing the unused blocks on this cluster */
+ blknr += nr_used;
+ n = nr_used;
+ while (blknr < last_blknr) {
+ bhs[n] = sb_getblk(sb, blknr);
+ if (!bhs[n]) {
+ err = -ENOMEM;
+ goto error;
+ }
+ memset(bhs[n]->b_data, 0, sb->s_blocksize);
+ set_buffer_uptodate(bhs[n]);
+ mark_buffer_dirty(bhs[n]);
+
+ n++;
+ blknr++;
+ if (n == nr_bhs) {
+ if (IS_DIRSYNC(dir)) {
+ err = fat_sync_bhs(bhs, n);
+ if (err)
+ goto error;
+ }
+ for (i = 0; i < n; i++)
+ brelse(bhs[i]);
+ n = 0;
+ }
+ }
+ if (IS_DIRSYNC(dir)) {
+ err = fat_sync_bhs(bhs, n);
+ if (err)
+ goto error;
+ }
+ for (i = 0; i < n; i++)
+ brelse(bhs[i]);
+
+ return 0;
+
+error:
+ for (i = 0; i < n; i++)
+ bforget(bhs[i]);
+ return err;
+}
+
+int fat_alloc_new_dir(struct inode *dir, struct timespec *ts)
+{
+ struct super_block *sb = dir->i_sb;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ struct buffer_head *bhs[MAX_BUF_PER_PAGE];
+ struct msdos_dir_entry *de;
+ sector_t blknr;
+ __le16 date, time;
+ int err, cluster;
+
+ err = fat_alloc_clusters(dir, &cluster, 1);
+ if (err)
+ goto error;
+
+ blknr = fat_clus_to_blknr(sbi, cluster);
+ bhs[0] = sb_getblk(sb, blknr);
+ if (!bhs[0]) {
+ err = -ENOMEM;
+ goto error_free;
+ }
+
+ fat_date_unix2dos(ts->tv_sec, &time, &date);
+
+ de = (struct msdos_dir_entry *)bhs[0]->b_data;
+ /* filling the new directory slots ("." and ".." entries) */
+ memcpy(de[0].name, MSDOS_DOT, MSDOS_NAME);
+ memcpy(de[1].name, MSDOS_DOTDOT, MSDOS_NAME);
+ de->attr = de[1].attr = ATTR_DIR;
+ de[0].lcase = de[1].lcase = 0;
+ de[0].time = de[1].time = time;
+ de[0].date = de[1].date = date;
+ de[0].ctime_cs = de[1].ctime_cs = 0;
+ if (sbi->options.isvfat) {
+ /* extra timestamps */
+ de[0].ctime = de[1].ctime = time;
+ de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = date;
+ } else {
+ de[0].ctime = de[1].ctime = 0;
+ de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0;
+ }
+ de[0].start = cpu_to_le16(cluster);
+ de[0].starthi = cpu_to_le16(cluster >> 16);
+ de[1].start = cpu_to_le16(MSDOS_I(dir)->i_logstart);
+ de[1].starthi = cpu_to_le16(MSDOS_I(dir)->i_logstart >> 16);
+ de[0].size = de[1].size = 0;
+ memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de));
+ set_buffer_uptodate(bhs[0]);
+ mark_buffer_dirty(bhs[0]);
+
+ err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE);
+ if (err)
+ goto error_free;
+
+ return cluster;
+
+error_free:
+ fat_free_clusters(dir, cluster);
+error:
+ return err;
+}
+
+EXPORT_SYMBOL(fat_alloc_new_dir);
+
+static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots,
+ int *nr_cluster, struct msdos_dir_entry **de,
+ struct buffer_head **bh, loff_t *i_pos)
+{
+ struct super_block *sb = dir->i_sb;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ struct buffer_head *bhs[MAX_BUF_PER_PAGE];
+ sector_t blknr, start_blknr, last_blknr;
+ unsigned long size, copy;
+ int err, i, n, offset, cluster[2];
+
+ /*
+ * The minimum cluster size is 512bytes, and maximum entry
+ * size is 32*slots (672bytes). So, iff the cluster size is
+ * 512bytes, we may need two clusters.
+ */
+ size = nr_slots * sizeof(struct msdos_dir_entry);
+ *nr_cluster = (size + (sbi->cluster_size - 1)) >> sbi->cluster_bits;
+ BUG_ON(*nr_cluster > 2);
+
+ err = fat_alloc_clusters(dir, cluster, *nr_cluster);
+ if (err)
+ goto error;
+
+ /*
+ * First stage: Fill the directory entry. NOTE: This cluster
+ * is not referenced from any inode yet, so updates order is
+ * not important.
+ */
+ i = n = copy = 0;
+ do {
+ start_blknr = blknr = fat_clus_to_blknr(sbi, cluster[i]);
+ last_blknr = start_blknr + sbi->sec_per_clus;
+ while (blknr < last_blknr) {
+ bhs[n] = sb_getblk(sb, blknr);
+ if (!bhs[n]) {
+ err = -ENOMEM;
+ goto error_nomem;
+ }
+
+ /* fill the directory entry */
+ copy = min(size, sb->s_blocksize);
+ memcpy(bhs[n]->b_data, slots, copy);
+ slots += copy;
+ size -= copy;
+ set_buffer_uptodate(bhs[n]);
+ mark_buffer_dirty(bhs[n]);
+ if (!size)
+ break;
+ n++;
+ blknr++;
+ }
+ } while (++i < *nr_cluster);
+
+ memset(bhs[n]->b_data + copy, 0, sb->s_blocksize - copy);
+ offset = copy - sizeof(struct msdos_dir_entry);
+ get_bh(bhs[n]);
+ *bh = bhs[n];
+ *de = (struct msdos_dir_entry *)((*bh)->b_data + offset);
+ *i_pos = fat_make_i_pos(sb, *bh, *de);
+
+ /* Second stage: clear the rest of cluster, and write outs */
+ err = fat_zeroed_cluster(dir, start_blknr, ++n, bhs, MAX_BUF_PER_PAGE);
+ if (err)
+ goto error_free;
+
+ return cluster[0];
+
+error_free:
+ brelse(*bh);
+ *bh = NULL;
+ n = 0;
+error_nomem:
+ for (i = 0; i < n; i++)
+ bforget(bhs[i]);
+ fat_free_clusters(dir, cluster[0]);
+error:
+ return err;
+}
+
+int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
+ struct fat_slot_info *sinfo)
+{
+ struct super_block *sb = dir->i_sb;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ struct buffer_head *bh, *prev, *bhs[3]; /* 32*slots (672bytes) */
+ struct msdos_dir_entry *de;
+ int err, free_slots, i, nr_bhs;
+ loff_t pos, i_pos;
+
+ sinfo->nr_slots = nr_slots;
+
+ /* First stage: search free direcotry entries */
+ free_slots = nr_bhs = 0;
+ bh = prev = NULL;
+ pos = 0;
+ err = -ENOSPC;
+ while (fat_get_entry(dir, &pos, &bh, &de) > -1) {
+ /* check the maximum size of directory */
+ if (pos >= FAT_MAX_DIR_SIZE)
+ goto error;
+
+ if (IS_FREE(de->name)) {
+ if (prev != bh) {
+ get_bh(bh);
+ bhs[nr_bhs] = prev = bh;
+ nr_bhs++;
+ }
+ free_slots++;
+ if (free_slots == nr_slots)
+ goto found;
+ } else {
+ for (i = 0; i < nr_bhs; i++)
+ brelse(bhs[i]);
+ prev = NULL;
+ free_slots = nr_bhs = 0;
+ }
+ }
+ if (dir->i_ino == MSDOS_ROOT_INO) {
+ if (sbi->fat_bits != 32)
+ goto error;
+ } else if (MSDOS_I(dir)->i_start == 0) {
+ printk(KERN_ERR "FAT: Corrupted directory (i_pos %lld)\n",
+ MSDOS_I(dir)->i_pos);
+ err = -EIO;
+ goto error;
+ }
+
+found:
+ err = 0;
+ pos -= free_slots * sizeof(*de);
+ nr_slots -= free_slots;
+ if (free_slots) {
+ /*
+ * Second stage: filling the free entries with new entries.
+ * NOTE: If this slots has shortname, first, we write
+ * the long name slots, then write the short name.
+ */
+ int size = free_slots * sizeof(*de);
+ int offset = pos & (sb->s_blocksize - 1);
+ int long_bhs = nr_bhs - (nr_slots == 0);
+
+ /* Fill the long name slots. */
+ for (i = 0; i < long_bhs; i++) {
+ int copy = min_t(int, sb->s_blocksize - offset, size);
+ memcpy(bhs[i]->b_data + offset, slots, copy);
+ mark_buffer_dirty(bhs[i]);
+ offset = 0;
+ slots += copy;
+ size -= copy;
+ }
+ if (long_bhs && IS_DIRSYNC(dir))
+ err = fat_sync_bhs(bhs, long_bhs);
+ if (!err && i < nr_bhs) {
+ /* Fill the short name slot. */
+ int copy = min_t(int, sb->s_blocksize - offset, size);
+ memcpy(bhs[i]->b_data + offset, slots, copy);
+ mark_buffer_dirty(bhs[i]);
+ if (IS_DIRSYNC(dir))
+ err = sync_dirty_buffer(bhs[i]);
+ }
+ for (i = 0; i < nr_bhs; i++)
+ brelse(bhs[i]);
+ if (err)
+ goto error_remove;
+ }
+
+ if (nr_slots) {
+ int cluster, nr_cluster;
+
+ /*
+ * Third stage: allocate the cluster for new entries.
+ * And initialize the cluster with new entries, then
+ * add the cluster to dir.
+ */
+ cluster = fat_add_new_entries(dir, slots, nr_slots, &nr_cluster,
+ &de, &bh, &i_pos);
+ if (cluster < 0) {
+ err = cluster;
+ goto error_remove;
+ }
+ err = fat_chain_add(dir, cluster, nr_cluster);
+ if (err) {
+ fat_free_clusters(dir, cluster);
+ goto error_remove;
+ }
+ if (dir->i_size & (sbi->cluster_size - 1)) {
+ fat_fs_panic(sb, "Odd directory size");
+ dir->i_size = (dir->i_size + sbi->cluster_size - 1)
+ & ~((loff_t)sbi->cluster_size - 1);
+ }
+ dir->i_size += nr_cluster << sbi->cluster_bits;
+ MSDOS_I(dir)->mmu_private += nr_cluster << sbi->cluster_bits;
+ }
+ sinfo->slot_off = pos;
+ sinfo->de = de;
+ sinfo->bh = bh;
+ sinfo->i_pos = fat_make_i_pos(sb, sinfo->bh, sinfo->de);
+
+ return 0;
+
+error:
+ brelse(bh);
+ for (i = 0; i < nr_bhs; i++)
+ brelse(bhs[i]);
+ return err;
+
+error_remove:
+ brelse(bh);
+ if (free_slots)
+ __fat_remove_entries(dir, pos, free_slots);
+ return err;
+}
+
+EXPORT_SYMBOL(fat_add_entries);
diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c
new file mode 100644
index 0000000..4164cd5
--- /dev/null
+++ b/fs/fat/fatent.c
@@ -0,0 +1,612 @@
+/*
+ * Copyright (C) 2004, OGAWA Hirofumi
+ * Released under GPL v2.
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/msdos_fs.h>
+
+struct fatent_operations {
+ void (*ent_blocknr)(struct super_block *, int, int *, sector_t *);
+ void (*ent_set_ptr)(struct fat_entry *, int);
+ int (*ent_bread)(struct super_block *, struct fat_entry *,
+ int, sector_t);
+ int (*ent_get)(struct fat_entry *);
+ void (*ent_put)(struct fat_entry *, int);
+ int (*ent_next)(struct fat_entry *);
+};
+
+static void fat12_ent_blocknr(struct super_block *sb, int entry,
+ int *offset, sector_t *blocknr)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ int bytes = entry + (entry >> 1);
+ WARN_ON(entry < FAT_START_ENT || sbi->max_cluster <= entry);
+ *offset = bytes & (sb->s_blocksize - 1);
+ *blocknr = sbi->fat_start + (bytes >> sb->s_blocksize_bits);
+}
+
+static void fat_ent_blocknr(struct super_block *sb, int entry,
+ int *offset, sector_t *blocknr)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ int bytes = (entry << sbi->fatent_shift);
+ WARN_ON(entry < FAT_START_ENT || sbi->max_cluster <= entry);
+ *offset = bytes & (sb->s_blocksize - 1);
+ *blocknr = sbi->fat_start + (bytes >> sb->s_blocksize_bits);
+}
+
+static void fat12_ent_set_ptr(struct fat_entry *fatent, int offset)
+{
+ struct buffer_head **bhs = fatent->bhs;
+ if (fatent->nr_bhs == 1) {
+ WARN_ON(offset >= (bhs[0]->b_size - 1));
+ fatent->u.ent12_p[0] = bhs[0]->b_data + offset;
+ fatent->u.ent12_p[1] = bhs[0]->b_data + (offset + 1);
+ } else {
+ WARN_ON(offset != (bhs[0]->b_size - 1));
+ fatent->u.ent12_p[0] = bhs[0]->b_data + offset;
+ fatent->u.ent12_p[1] = bhs[1]->b_data;
+ }
+}
+
+static void fat16_ent_set_ptr(struct fat_entry *fatent, int offset)
+{
+ WARN_ON(offset & (2 - 1));
+ fatent->u.ent16_p = (__le16 *)(fatent->bhs[0]->b_data + offset);
+}
+
+static void fat32_ent_set_ptr(struct fat_entry *fatent, int offset)
+{
+ WARN_ON(offset & (4 - 1));
+ fatent->u.ent32_p = (__le32 *)(fatent->bhs[0]->b_data + offset);
+}
+
+static int fat12_ent_bread(struct super_block *sb, struct fat_entry *fatent,
+ int offset, sector_t blocknr)
+{
+ struct buffer_head **bhs = fatent->bhs;
+
+ WARN_ON(blocknr < MSDOS_SB(sb)->fat_start);
+ bhs[0] = sb_bread(sb, blocknr);
+ if (!bhs[0])
+ goto err;
+
+ if ((offset + 1) < sb->s_blocksize)
+ fatent->nr_bhs = 1;
+ else {
+ /* This entry is block boundary, it needs the next block */
+ blocknr++;
+ bhs[1] = sb_bread(sb, blocknr);
+ if (!bhs[1])
+ goto err_brelse;
+ fatent->nr_bhs = 2;
+ }
+ fat12_ent_set_ptr(fatent, offset);
+ return 0;
+
+err_brelse:
+ brelse(bhs[0]);
+err:
+ printk(KERN_ERR "FAT: FAT read failed (blocknr %llu)\n",
+ (unsigned long long)blocknr);
+ return -EIO;
+}
+
+static int fat_ent_bread(struct super_block *sb, struct fat_entry *fatent,
+ int offset, sector_t blocknr)
+{
+ struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
+
+ WARN_ON(blocknr < MSDOS_SB(sb)->fat_start);
+ fatent->bhs[0] = sb_bread(sb, blocknr);
+ if (!fatent->bhs[0]) {
+ printk(KERN_ERR "FAT: FAT read failed (blocknr %llu)\n",
+ (unsigned long long)blocknr);
+ return -EIO;
+ }
+ fatent->nr_bhs = 1;
+ ops->ent_set_ptr(fatent, offset);
+ return 0;
+}
+
+static int fat12_ent_get(struct fat_entry *fatent)
+{
+ u8 **ent12_p = fatent->u.ent12_p;
+ int next;
+
+ if (fatent->entry & 1)
+ next = (*ent12_p[0] >> 4) | (*ent12_p[1] << 4);
+ else
+ next = (*ent12_p[1] << 8) | *ent12_p[0];
+ next &= 0x0fff;
+ if (next >= BAD_FAT12)
+ next = FAT_ENT_EOF;
+ return next;
+}
+
+static int fat16_ent_get(struct fat_entry *fatent)
+{
+ int next = le16_to_cpu(*fatent->u.ent16_p);
+ WARN_ON((unsigned long)fatent->u.ent16_p & (2 - 1));
+ if (next >= BAD_FAT16)
+ next = FAT_ENT_EOF;
+ return next;
+}
+
+static int fat32_ent_get(struct fat_entry *fatent)
+{
+ int next = le32_to_cpu(*fatent->u.ent32_p) & 0x0fffffff;
+ WARN_ON((unsigned long)fatent->u.ent32_p & (4 - 1));
+ if (next >= BAD_FAT32)
+ next = FAT_ENT_EOF;
+ return next;
+}
+
+static void fat12_ent_put(struct fat_entry *fatent, int new)
+{
+ u8 **ent12_p = fatent->u.ent12_p;
+
+ if (new == FAT_ENT_EOF)
+ new = EOF_FAT12;
+
+ if (fatent->entry & 1) {
+ *ent12_p[0] = (new << 4) | (*ent12_p[0] & 0x0f);
+ *ent12_p[1] = new >> 4;
+ } else {
+ *ent12_p[0] = new & 0xff;
+ *ent12_p[1] = (*ent12_p[1] & 0xf0) | (new >> 8);
+ }
+
+ mark_buffer_dirty(fatent->bhs[0]);
+ if (fatent->nr_bhs == 2)
+ mark_buffer_dirty(fatent->bhs[1]);
+}
+
+static void fat16_ent_put(struct fat_entry *fatent, int new)
+{
+ if (new == FAT_ENT_EOF)
+ new = EOF_FAT16;
+
+ *fatent->u.ent16_p = cpu_to_le16(new);
+ mark_buffer_dirty(fatent->bhs[0]);
+}
+
+static void fat32_ent_put(struct fat_entry *fatent, int new)
+{
+ if (new == FAT_ENT_EOF)
+ new = EOF_FAT32;
+
+ WARN_ON(new & 0xf0000000);
+ new |= le32_to_cpu(*fatent->u.ent32_p) & ~0x0fffffff;
+ *fatent->u.ent32_p = cpu_to_le32(new);
+ mark_buffer_dirty(fatent->bhs[0]);
+}
+
+static int fat12_ent_next(struct fat_entry *fatent)
+{
+ u8 **ent12_p = fatent->u.ent12_p;
+ struct buffer_head **bhs = fatent->bhs;
+ u8 *nextp = ent12_p[1] + 1 + (fatent->entry & 1);
+
+ fatent->entry++;
+ if (fatent->nr_bhs == 1) {
+ WARN_ON(ent12_p[0] > (u8 *)(bhs[0]->b_data + (bhs[0]->b_size - 2)));
+ WARN_ON(ent12_p[1] > (u8 *)(bhs[0]->b_data + (bhs[0]->b_size - 1)));
+ if (nextp < (u8 *)(bhs[0]->b_data + (bhs[0]->b_size - 1))) {
+ ent12_p[0] = nextp - 1;
+ ent12_p[1] = nextp;
+ return 1;
+ }
+ } else {
+ WARN_ON(ent12_p[0] != (u8 *)(bhs[0]->b_data + (bhs[0]->b_size - 1)));
+ WARN_ON(ent12_p[1] != (u8 *)bhs[1]->b_data);
+ ent12_p[0] = nextp - 1;
+ ent12_p[1] = nextp;
+ brelse(bhs[0]);
+ bhs[0] = bhs[1];
+ fatent->nr_bhs = 1;
+ return 1;
+ }
+ ent12_p[0] = NULL;
+ ent12_p[1] = NULL;
+ return 0;
+}
+
+static int fat16_ent_next(struct fat_entry *fatent)
+{
+ const struct buffer_head *bh = fatent->bhs[0];
+ fatent->entry++;
+ if (fatent->u.ent16_p < (__le16 *)(bh->b_data + (bh->b_size - 2))) {
+ fatent->u.ent16_p++;
+ return 1;
+ }
+ fatent->u.ent16_p = NULL;
+ return 0;
+}
+
+static int fat32_ent_next(struct fat_entry *fatent)
+{
+ const struct buffer_head *bh = fatent->bhs[0];
+ fatent->entry++;
+ if (fatent->u.ent32_p < (__le32 *)(bh->b_data + (bh->b_size - 4))) {
+ fatent->u.ent32_p++;
+ return 1;
+ }
+ fatent->u.ent32_p = NULL;
+ return 0;
+}
+
+static struct fatent_operations fat12_ops = {
+ .ent_blocknr = fat12_ent_blocknr,
+ .ent_set_ptr = fat12_ent_set_ptr,
+ .ent_bread = fat12_ent_bread,
+ .ent_get = fat12_ent_get,
+ .ent_put = fat12_ent_put,
+ .ent_next = fat12_ent_next,
+};
+
+static struct fatent_operations fat16_ops = {
+ .ent_blocknr = fat_ent_blocknr,
+ .ent_set_ptr = fat16_ent_set_ptr,
+ .ent_bread = fat_ent_bread,
+ .ent_get = fat16_ent_get,
+ .ent_put = fat16_ent_put,
+ .ent_next = fat16_ent_next,
+};
+
+static struct fatent_operations fat32_ops = {
+ .ent_blocknr = fat_ent_blocknr,
+ .ent_set_ptr = fat32_ent_set_ptr,
+ .ent_bread = fat_ent_bread,
+ .ent_get = fat32_ent_get,
+ .ent_put = fat32_ent_put,
+ .ent_next = fat32_ent_next,
+};
+
+static inline void lock_fat(struct msdos_sb_info *sbi)
+{
+ down(&sbi->fat_lock);
+}
+
+static inline void unlock_fat(struct msdos_sb_info *sbi)
+{
+ up(&sbi->fat_lock);
+}
+
+void fat_ent_access_init(struct super_block *sb)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+
+ init_MUTEX(&sbi->fat_lock);
+
+ switch (sbi->fat_bits) {
+ case 32:
+ sbi->fatent_shift = 2;
+ sbi->fatent_ops = &fat32_ops;
+ break;
+ case 16:
+ sbi->fatent_shift = 1;
+ sbi->fatent_ops = &fat16_ops;
+ break;
+ case 12:
+ sbi->fatent_shift = -1;
+ sbi->fatent_ops = &fat12_ops;
+ break;
+ }
+}
+
+static inline int fat_ent_update_ptr(struct super_block *sb,
+ struct fat_entry *fatent,
+ int offset, sector_t blocknr)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ struct fatent_operations *ops = sbi->fatent_ops;
+ struct buffer_head **bhs = fatent->bhs;
+
+ /* Is this fatent's blocks including this entry? */
+ if (!fatent->nr_bhs || bhs[0]->b_blocknr != blocknr)
+ return 0;
+ /* Does this entry need the next block? */
+ if (sbi->fat_bits == 12 && (offset + 1) >= sb->s_blocksize) {
+ if (fatent->nr_bhs != 2 || bhs[1]->b_blocknr != (blocknr + 1))
+ return 0;
+ }
+ ops->ent_set_ptr(fatent, offset);
+ return 1;
+}
+
+int fat_ent_read(struct inode *inode, struct fat_entry *fatent, int entry)
+{
+ struct super_block *sb = inode->i_sb;
+ struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+ struct fatent_operations *ops = sbi->fatent_ops;
+ int err, offset;
+ sector_t blocknr;
+
+ if (entry < FAT_START_ENT || sbi->max_cluster <= entry) {
+ fatent_brelse(fatent);
+ fat_fs_panic(sb, "invalid access to FAT (entry 0x%08x)", entry);
+ return -EIO;
+ }
+
+ fatent_set_entry(fatent, entry);
+ ops->ent_blocknr(sb, entry, &offset, &blocknr);
+
+ if (!fat_ent_update_ptr(sb, fatent, offset, blocknr)) {
+ fatent_brelse(fatent);
+ err = ops->ent_bread(sb, fatent, offset, blocknr);
+ if (err)
+ return err;
+ }
+ return ops->ent_get(fatent);
+}
+
+/* FIXME: We can write the blocks as more big chunk. */
+static int fat_mirror_bhs(struct super_block *sb, struct buffer_head **bhs,
+ int nr_bhs)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ struct buffer_head *c_bh;
+ int err, n, copy;
+
+ err = 0;
+ for (copy = 1; copy < sbi->fats; copy++) {
+ sector_t backup_fat = sbi->fat_length * copy;
+
+ for (n = 0; n < nr_bhs; n++) {
+ c_bh = sb_getblk(sb, backup_fat + bhs[n]->b_blocknr);
+ if (!c_bh) {
+ err = -ENOMEM;
+ goto error;
+ }
+ memcpy(c_bh->b_data, bhs[n]->b_data, sb->s_blocksize);
+ set_buffer_uptodate(c_bh);
+ mark_buffer_dirty(c_bh);
+ if (sb->s_flags & MS_SYNCHRONOUS)
+ err = sync_dirty_buffer(c_bh);
+ brelse(c_bh);
+ if (err)
+ goto error;
+ }
+ }
+error:
+ return err;
+}
+
+int fat_ent_write(struct inode *inode, struct fat_entry *fatent,
+ int new, int wait)
+{
+ struct super_block *sb = inode->i_sb;
+ struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
+ int err;
+
+ ops->ent_put(fatent, new);
+ if (wait) {
+ err = fat_sync_bhs(fatent->bhs, fatent->nr_bhs);
+ if (err)
+ return err;
+ }
+ return fat_mirror_bhs(sb, fatent->bhs, fatent->nr_bhs);
+}
+
+static inline int fat_ent_next(struct msdos_sb_info *sbi,
+ struct fat_entry *fatent)
+{
+ if (sbi->fatent_ops->ent_next(fatent)) {
+ if (fatent->entry < sbi->max_cluster)
+ return 1;
+ }
+ return 0;
+}
+
+static inline int fat_ent_read_block(struct super_block *sb,
+ struct fat_entry *fatent)
+{
+ struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
+ sector_t blocknr;
+ int offset;
+
+ fatent_brelse(fatent);
+ ops->ent_blocknr(sb, fatent->entry, &offset, &blocknr);
+ return ops->ent_bread(sb, fatent, offset, blocknr);
+}
+
+static void fat_collect_bhs(struct buffer_head **bhs, int *nr_bhs,
+ struct fat_entry *fatent)
+{
+ int n, i;
+
+ for (n = 0; n < fatent->nr_bhs; n++) {
+ for (i = 0; i < *nr_bhs; i++) {
+ if (fatent->bhs[n] == bhs[i])
+ break;
+ }
+ if (i == *nr_bhs) {
+ get_bh(fatent->bhs[n]);
+ bhs[i] = fatent->bhs[n];
+ (*nr_bhs)++;
+ }
+ }
+}
+
+int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster)
+{
+ struct super_block *sb = inode->i_sb;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ struct fatent_operations *ops = sbi->fatent_ops;
+ struct fat_entry fatent, prev_ent;
+ struct buffer_head *bhs[MAX_BUF_PER_PAGE];
+ int i, count, err, nr_bhs, idx_clus;
+
+ BUG_ON(nr_cluster > (MAX_BUF_PER_PAGE / 2)); /* fixed limit */
+
+ lock_fat(sbi);
+ if (sbi->free_clusters != -1 && sbi->free_clusters < nr_cluster) {
+ unlock_fat(sbi);
+ return -ENOSPC;
+ }
+
+ err = nr_bhs = idx_clus = 0;
+ count = FAT_START_ENT;
+ fatent_init(&prev_ent);
+ fatent_init(&fatent);
+ fatent_set_entry(&fatent, sbi->prev_free + 1);
+ while (count < sbi->max_cluster) {
+ if (fatent.entry >= sbi->max_cluster)
+ fatent.entry = FAT_START_ENT;
+ fatent_set_entry(&fatent, fatent.entry);
+ err = fat_ent_read_block(sb, &fatent);
+ if (err)
+ goto out;
+
+ /* Find the free entries in a block */
+ do {
+ if (ops->ent_get(&fatent) == FAT_ENT_FREE) {
+ int entry = fatent.entry;
+
+ /* make the cluster chain */
+ ops->ent_put(&fatent, FAT_ENT_EOF);
+ if (prev_ent.nr_bhs)
+ ops->ent_put(&prev_ent, entry);
+
+ fat_collect_bhs(bhs, &nr_bhs, &fatent);
+
+ sbi->prev_free = entry;
+ if (sbi->free_clusters != -1)
+ sbi->free_clusters--;
+
+ cluster[idx_clus] = entry;
+ idx_clus++;
+ if (idx_clus == nr_cluster)
+ goto out;
+
+ /*
+ * fat_collect_bhs() gets ref-count of bhs,
+ * so we can still use the prev_ent.
+ */
+ prev_ent = fatent;
+ }
+ count++;
+ if (count == sbi->max_cluster)
+ break;
+ } while (fat_ent_next(sbi, &fatent));
+ }
+
+ /* Couldn't allocate the free entries */
+ sbi->free_clusters = 0;
+ err = -ENOSPC;
+
+out:
+ unlock_fat(sbi);
+ fatent_brelse(&fatent);
+ if (!err) {
+ if (inode_needs_sync(inode))
+ err = fat_sync_bhs(bhs, nr_bhs);
+ if (!err)
+ err = fat_mirror_bhs(sb, bhs, nr_bhs);
+ }
+ for (i = 0; i < nr_bhs; i++)
+ brelse(bhs[i]);
+ fat_clusters_flush(sb);
+
+ if (err && idx_clus)
+ fat_free_clusters(inode, cluster[0]);
+
+ return err;
+}
+
+int fat_free_clusters(struct inode *inode, int cluster)
+{
+ struct super_block *sb = inode->i_sb;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ struct fatent_operations *ops = sbi->fatent_ops;
+ struct fat_entry fatent;
+ struct buffer_head *bhs[MAX_BUF_PER_PAGE];
+ int i, err, nr_bhs;
+
+ nr_bhs = 0;
+ fatent_init(&fatent);
+ lock_fat(sbi);
+ do {
+ cluster = fat_ent_read(inode, &fatent, cluster);
+ if (cluster < 0) {
+ err = cluster;
+ goto error;
+ } else if (cluster == FAT_ENT_FREE) {
+ fat_fs_panic(sb, "%s: deleting FAT entry beyond EOF",
+ __FUNCTION__);
+ err = -EIO;
+ goto error;
+ }
+
+ ops->ent_put(&fatent, FAT_ENT_FREE);
+ if (sbi->free_clusters != -1)
+ sbi->free_clusters++;
+
+ if (nr_bhs + fatent.nr_bhs > MAX_BUF_PER_PAGE) {
+ if (sb->s_flags & MS_SYNCHRONOUS) {
+ err = fat_sync_bhs(bhs, nr_bhs);
+ if (err)
+ goto error;
+ }
+ err = fat_mirror_bhs(sb, bhs, nr_bhs);
+ if (err)
+ goto error;
+ for (i = 0; i < nr_bhs; i++)
+ brelse(bhs[i]);
+ nr_bhs = 0;
+ }
+ fat_collect_bhs(bhs, &nr_bhs, &fatent);
+ } while (cluster != FAT_ENT_EOF);
+
+ if (sb->s_flags & MS_SYNCHRONOUS) {
+ err = fat_sync_bhs(bhs, nr_bhs);
+ if (err)
+ goto error;
+ }
+ err = fat_mirror_bhs(sb, bhs, nr_bhs);
+error:
+ fatent_brelse(&fatent);
+ for (i = 0; i < nr_bhs; i++)
+ brelse(bhs[i]);
+ unlock_fat(sbi);
+
+ fat_clusters_flush(sb);
+
+ return err;
+}
+
+EXPORT_SYMBOL(fat_free_clusters);
+
+int fat_count_free_clusters(struct super_block *sb)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ struct fatent_operations *ops = sbi->fatent_ops;
+ struct fat_entry fatent;
+ int err = 0, free;
+
+ lock_fat(sbi);
+ if (sbi->free_clusters != -1)
+ goto out;
+
+ free = 0;
+ fatent_init(&fatent);
+ fatent_set_entry(&fatent, FAT_START_ENT);
+ while (fatent.entry < sbi->max_cluster) {
+ err = fat_ent_read_block(sb, &fatent);
+ if (err)
+ goto out;
+
+ do {
+ if (ops->ent_get(&fatent) == FAT_ENT_FREE)
+ free++;
+ } while (fat_ent_next(sbi, &fatent));
+ }
+ sbi->free_clusters = free;
+ fatent_brelse(&fatent);
+out:
+ unlock_fat(sbi);
+ return err;
+}
diff --git a/fs/fat/file.c b/fs/fat/file.c
new file mode 100644
index 0000000..62ffa91
--- /dev/null
+++ b/fs/fat/file.c
@@ -0,0 +1,308 @@
+/*
+ * linux/fs/fat/file.c
+ *
+ * Written 1992,1993 by Werner Almesberger
+ *
+ * regular file handling primitives for fat-based filesystems
+ */
+
+#include <linux/module.h>
+#include <linux/time.h>
+#include <linux/msdos_fs.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>
+
+static ssize_t fat_file_aio_write(struct kiocb *iocb, const char __user *buf,
+ size_t count, loff_t pos)
+{
+ struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
+ int retval;
+
+ retval = generic_file_aio_write(iocb, buf, count, pos);
+ if (retval > 0) {
+ inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
+ MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
+ mark_inode_dirty(inode);
+// check the locking rules
+// if (IS_SYNC(inode))
+// fat_sync_inode(inode);
+ }
+ return retval;
+}
+
+static ssize_t fat_file_writev(struct file *filp, const struct iovec *iov,
+ unsigned long nr_segs, loff_t *ppos)
+{
+ struct inode *inode = filp->f_dentry->d_inode;
+ int retval;
+
+ retval = generic_file_writev(filp, iov, nr_segs, ppos);
+ if (retval > 0) {
+ inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
+ MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
+ mark_inode_dirty(inode);
+ }
+ return retval;
+}
+
+int fat_generic_ioctl(struct inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+ u32 __user *user_attr = (u32 __user *)arg;
+
+ switch (cmd) {
+ case FAT_IOCTL_GET_ATTRIBUTES:
+ {
+ u32 attr;
+
+ if (inode->i_ino == MSDOS_ROOT_INO)
+ attr = ATTR_DIR;
+ else
+ attr = fat_attr(inode);
+
+ return put_user(attr, user_attr);
+ }
+ case FAT_IOCTL_SET_ATTRIBUTES:
+ {
+ u32 attr, oldattr;
+ int err, is_dir = S_ISDIR(inode->i_mode);
+ struct iattr ia;
+
+ err = get_user(attr, user_attr);
+ if (err)
+ return err;
+
+ down(&inode->i_sem);
+
+ if (IS_RDONLY(inode)) {
+ err = -EROFS;
+ goto up;
+ }
+
+ /*
+ * ATTR_VOLUME and ATTR_DIR cannot be changed; this also
+ * prevents the user from turning us into a VFAT
+ * longname entry. Also, we obviously can't set
+ * any of the NTFS attributes in the high 24 bits.
+ */
+ attr &= 0xff & ~(ATTR_VOLUME | ATTR_DIR);
+ /* Merge in ATTR_VOLUME and ATTR_DIR */
+ attr |= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) |
+ (is_dir ? ATTR_DIR : 0);
+ oldattr = fat_attr(inode);
+
+ /* Equivalent to a chmod() */
+ ia.ia_valid = ATTR_MODE | ATTR_CTIME;
+ if (is_dir) {
+ ia.ia_mode = MSDOS_MKMODE(attr,
+ S_IRWXUGO & ~sbi->options.fs_dmask)
+ | S_IFDIR;
+ } else {
+ ia.ia_mode = MSDOS_MKMODE(attr,
+ (S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO))
+ & ~sbi->options.fs_fmask)
+ | S_IFREG;
+ }
+
+ /* The root directory has no attributes */
+ if (inode->i_ino == MSDOS_ROOT_INO && attr != ATTR_DIR) {
+ err = -EINVAL;
+ goto up;
+ }
+
+ if (sbi->options.sys_immutable) {
+ if ((attr | oldattr) & ATTR_SYS) {
+ if (!capable(CAP_LINUX_IMMUTABLE)) {
+ err = -EPERM;
+ goto up;
+ }
+ }
+ }
+
+ /* This MUST be done before doing anything irreversible... */
+ err = notify_change(filp->f_dentry, &ia);
+ if (err)
+ goto up;
+
+ if (sbi->options.sys_immutable) {
+ if (attr & ATTR_SYS)
+ inode->i_flags |= S_IMMUTABLE;
+ else
+ inode->i_flags &= S_IMMUTABLE;
+ }
+
+ MSDOS_I(inode)->i_attrs = attr & ATTR_UNUSED;
+ mark_inode_dirty(inode);
+ up:
+ up(&inode->i_sem);
+ return err;
+ }
+ default:
+ return -ENOTTY; /* Inappropriate ioctl for device */
+ }
+}
+
+struct file_operations fat_file_operations = {
+ .llseek = generic_file_llseek,
+ .read = do_sync_read,
+ .write = do_sync_write,
+ .readv = generic_file_readv,
+ .writev = fat_file_writev,
+ .aio_read = generic_file_aio_read,
+ .aio_write = fat_file_aio_write,
+ .mmap = generic_file_mmap,
+ .ioctl = fat_generic_ioctl,
+ .fsync = file_fsync,
+ .sendfile = generic_file_sendfile,
+};
+
+int fat_notify_change(struct dentry *dentry, struct iattr *attr)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
+ struct inode *inode = dentry->d_inode;
+ int mask, error = 0;
+
+ lock_kernel();
+
+ /* FAT cannot truncate to a longer file */
+ if (attr->ia_valid & ATTR_SIZE) {
+ if (attr->ia_size > inode->i_size) {
+ error = -EPERM;
+ goto out;
+ }
+ }
+
+ error = inode_change_ok(inode, attr);
+ if (error) {
+ if (sbi->options.quiet)
+ error = 0;
+ goto out;
+ }
+ if (((attr->ia_valid & ATTR_UID) &&
+ (attr->ia_uid != sbi->options.fs_uid)) ||
+ ((attr->ia_valid & ATTR_GID) &&
+ (attr->ia_gid != sbi->options.fs_gid)) ||
+ ((attr->ia_valid & ATTR_MODE) &&
+ (attr->ia_mode & ~MSDOS_VALID_MODE)))
+ error = -EPERM;
+
+ if (error) {
+ if (sbi->options.quiet)
+ error = 0;
+ goto out;
+ }
+ error = inode_setattr(inode, attr);
+ if (error)
+ goto out;
+
+ if (S_ISDIR(inode->i_mode))
+ mask = sbi->options.fs_dmask;
+ else
+ mask = sbi->options.fs_fmask;
+ inode->i_mode &= S_IFMT | (S_IRWXUGO & ~mask);
+out:
+ unlock_kernel();
+ return error;
+}
+
+EXPORT_SYMBOL(fat_notify_change);
+
+/* Free all clusters after the skip'th cluster. */
+static int fat_free(struct inode *inode, int skip)
+{
+ struct super_block *sb = inode->i_sb;
+ int err, wait, free_start, i_start, i_logstart;
+
+ if (MSDOS_I(inode)->i_start == 0)
+ return 0;
+
+ /*
+ * Write a new EOF, and get the remaining cluster chain for freeing.
+ */
+ wait = IS_DIRSYNC(inode);
+ if (skip) {
+ struct fat_entry fatent;
+ int ret, fclus, dclus;
+
+ ret = fat_get_cluster(inode, skip - 1, &fclus, &dclus);
+ if (ret < 0)
+ return ret;
+ else if (ret == FAT_ENT_EOF)
+ return 0;
+
+ fatent_init(&fatent);
+ ret = fat_ent_read(inode, &fatent, dclus);
+ if (ret == FAT_ENT_EOF) {
+ fatent_brelse(&fatent);
+ return 0;
+ } else if (ret == FAT_ENT_FREE) {
+ fat_fs_panic(sb,
+ "%s: invalid cluster chain (i_pos %lld)",
+ __FUNCTION__, MSDOS_I(inode)->i_pos);
+ ret = -EIO;
+ } else if (ret > 0) {
+ err = fat_ent_write(inode, &fatent, FAT_ENT_EOF, wait);
+ if (err)
+ ret = err;
+ }
+ fatent_brelse(&fatent);
+ if (ret < 0)
+ return ret;
+
+ free_start = ret;
+ i_start = i_logstart = 0;
+ fat_cache_inval_inode(inode);
+ } else {
+ fat_cache_inval_inode(inode);
+
+ i_start = free_start = MSDOS_I(inode)->i_start;
+ i_logstart = MSDOS_I(inode)->i_logstart;
+ MSDOS_I(inode)->i_start = 0;
+ MSDOS_I(inode)->i_logstart = 0;
+ }
+ MSDOS_I(inode)->i_attrs |= ATTR_ARCH;
+ inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
+ if (wait) {
+ err = fat_sync_inode(inode);
+ if (err)
+ goto error;
+ } else
+ mark_inode_dirty(inode);
+ inode->i_blocks = skip << (MSDOS_SB(sb)->cluster_bits - 9);
+
+ /* Freeing the remained cluster chain */
+ return fat_free_clusters(inode, free_start);
+
+error:
+ if (i_start) {
+ MSDOS_I(inode)->i_start = i_start;
+ MSDOS_I(inode)->i_logstart = i_logstart;
+ }
+ return err;
+}
+
+void fat_truncate(struct inode *inode)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+ const unsigned int cluster_size = sbi->cluster_size;
+ int nr_clusters;
+
+ /*
+ * This protects against truncating a file bigger than it was then
+ * trying to write into the hole.
+ */
+ if (MSDOS_I(inode)->mmu_private > inode->i_size)
+ MSDOS_I(inode)->mmu_private = inode->i_size;
+
+ nr_clusters = (inode->i_size + (cluster_size - 1)) >> sbi->cluster_bits;
+
+ lock_kernel();
+ fat_free(inode, nr_clusters);
+ unlock_kernel();
+}
+
+struct inode_operations fat_file_inode_operations = {
+ .truncate = fat_truncate,
+ .setattr = fat_notify_change,
+};
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
new file mode 100644
index 0000000..8ccee84
--- /dev/null
+++ b/fs/fat/inode.c
@@ -0,0 +1,1351 @@
+/*
+ * linux/fs/fat/inode.c
+ *
+ * Written 1992,1993 by Werner Almesberger
+ * VFAT extensions by Gordon Chaffee, merged with msdos fs by Henrik Storner
+ * Rewritten for the constant inumbers support by Al Viro
+ *
+ * Fixes:
+ *
+ * Max Cohan: Fixed invalid FSINFO offset when info_sector is 0
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.h>
+#include <linux/seq_file.h>
+#include <linux/msdos_fs.h>
+#include <linux/pagemap.h>
+#include <linux/buffer_head.h>
+#include <linux/mount.h>
+#include <linux/vfs.h>
+#include <linux/parser.h>
+#include <asm/unaligned.h>
+
+#ifndef CONFIG_FAT_DEFAULT_IOCHARSET
+/* if user don't select VFAT, this is undefined. */
+#define CONFIG_FAT_DEFAULT_IOCHARSET ""
+#endif
+
+static int fat_default_codepage = CONFIG_FAT_DEFAULT_CODEPAGE;
+static char fat_default_iocharset[] = CONFIG_FAT_DEFAULT_IOCHARSET;
+
+
+static int fat_add_cluster(struct inode *inode)
+{
+ int err, cluster;
+
+ err = fat_alloc_clusters(inode, &cluster, 1);
+ if (err)
+ return err;
+ /* FIXME: this cluster should be added after data of this
+ * cluster is writed */
+ err = fat_chain_add(inode, cluster, 1);
+ if (err)
+ fat_free_clusters(inode, cluster);
+ return err;
+}
+
+static int fat_get_block(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int create)
+{
+ struct super_block *sb = inode->i_sb;
+ sector_t phys;
+ int err;
+
+ err = fat_bmap(inode, iblock, &phys);
+ if (err)
+ return err;
+ if (phys) {
+ map_bh(bh_result, sb, phys);
+ return 0;
+ }
+ if (!create)
+ return 0;
+ if (iblock != MSDOS_I(inode)->mmu_private >> sb->s_blocksize_bits) {
+ fat_fs_panic(sb, "corrupted file size (i_pos %lld, %lld)",
+ MSDOS_I(inode)->i_pos, MSDOS_I(inode)->mmu_private);
+ return -EIO;
+ }
+ if (!((unsigned long)iblock & (MSDOS_SB(sb)->sec_per_clus - 1))) {
+ err = fat_add_cluster(inode);
+ if (err)
+ return err;
+ }
+ MSDOS_I(inode)->mmu_private += sb->s_blocksize;
+ err = fat_bmap(inode, iblock, &phys);
+ if (err)
+ return err;
+ if (!phys)
+ BUG();
+ set_buffer_new(bh_result);
+ map_bh(bh_result, sb, phys);
+ return 0;
+}
+
+static int fat_writepage(struct page *page, struct writeback_control *wbc)
+{
+ return block_write_full_page(page, fat_get_block, wbc);
+}
+
+static int fat_readpage(struct file *file, struct page *page)
+{
+ return block_read_full_page(page, fat_get_block);
+}
+
+static int fat_prepare_write(struct file *file, struct page *page,
+ unsigned from, unsigned to)
+{
+ return cont_prepare_write(page, from, to, fat_get_block,
+ &MSDOS_I(page->mapping->host)->mmu_private);
+}
+
+static sector_t _fat_bmap(struct address_space *mapping, sector_t block)
+{
+ return generic_block_bmap(mapping, block, fat_get_block);
+}
+
+static struct address_space_operations fat_aops = {
+ .readpage = fat_readpage,
+ .writepage = fat_writepage,
+ .sync_page = block_sync_page,
+ .prepare_write = fat_prepare_write,
+ .commit_write = generic_commit_write,
+ .bmap = _fat_bmap
+};
+
+/*
+ * New FAT inode stuff. We do the following:
+ * a) i_ino is constant and has nothing with on-disk location.
+ * b) FAT manages its own cache of directory entries.
+ * c) *This* cache is indexed by on-disk location.
+ * d) inode has an associated directory entry, all right, but
+ * it may be unhashed.
+ * e) currently entries are stored within struct inode. That should
+ * change.
+ * f) we deal with races in the following way:
+ * 1. readdir() and lookup() do FAT-dir-cache lookup.
+ * 2. rename() unhashes the F-d-c entry and rehashes it in
+ * a new place.
+ * 3. unlink() and rmdir() unhash F-d-c entry.
+ * 4. fat_write_inode() checks whether the thing is unhashed.
+ * If it is we silently return. If it isn't we do bread(),
+ * check if the location is still valid and retry if it
+ * isn't. Otherwise we do changes.
+ * 5. Spinlock is used to protect hash/unhash/location check/lookup
+ * 6. fat_clear_inode() unhashes the F-d-c entry.
+ * 7. lookup() and readdir() do igrab() if they find a F-d-c entry
+ * and consider negative result as cache miss.
+ */
+
+static void fat_hash_init(struct super_block *sb)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ int i;
+
+ spin_lock_init(&sbi->inode_hash_lock);
+ for (i = 0; i < FAT_HASH_SIZE; i++)
+ INIT_HLIST_HEAD(&sbi->inode_hashtable[i]);
+}
+
+static inline unsigned long fat_hash(struct super_block *sb, loff_t i_pos)
+{
+ unsigned long tmp = (unsigned long)i_pos | (unsigned long) sb;
+ tmp = tmp + (tmp >> FAT_HASH_BITS) + (tmp >> FAT_HASH_BITS * 2);
+ return tmp & FAT_HASH_MASK;
+}
+
+void fat_attach(struct inode *inode, loff_t i_pos)
+{
+ struct super_block *sb = inode->i_sb;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+
+ spin_lock(&sbi->inode_hash_lock);
+ MSDOS_I(inode)->i_pos = i_pos;
+ hlist_add_head(&MSDOS_I(inode)->i_fat_hash,
+ sbi->inode_hashtable + fat_hash(sb, i_pos));
+ spin_unlock(&sbi->inode_hash_lock);
+}
+
+EXPORT_SYMBOL(fat_attach);
+
+void fat_detach(struct inode *inode)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+ spin_lock(&sbi->inode_hash_lock);
+ MSDOS_I(inode)->i_pos = 0;
+ hlist_del_init(&MSDOS_I(inode)->i_fat_hash);
+ spin_unlock(&sbi->inode_hash_lock);
+}
+
+EXPORT_SYMBOL(fat_detach);
+
+struct inode *fat_iget(struct super_block *sb, loff_t i_pos)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ struct hlist_head *head = sbi->inode_hashtable + fat_hash(sb, i_pos);
+ struct hlist_node *_p;
+ struct msdos_inode_info *i;
+ struct inode *inode = NULL;
+
+ spin_lock(&sbi->inode_hash_lock);
+ hlist_for_each_entry(i, _p, head, i_fat_hash) {
+ BUG_ON(i->vfs_inode.i_sb != sb);
+ if (i->i_pos != i_pos)
+ continue;
+ inode = igrab(&i->vfs_inode);
+ if (inode)
+ break;
+ }
+ spin_unlock(&sbi->inode_hash_lock);
+ return inode;
+}
+
+static int is_exec(unsigned char *extension)
+{
+ unsigned char *exe_extensions = "EXECOMBAT", *walk;
+
+ for (walk = exe_extensions; *walk; walk += 3)
+ if (!strncmp(extension, walk, 3))
+ return 1;
+ return 0;
+}
+
+static int fat_calc_dir_size(struct inode *inode)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+ int ret, fclus, dclus;
+
+ inode->i_size = 0;
+ if (MSDOS_I(inode)->i_start == 0)
+ return 0;
+
+ ret = fat_get_cluster(inode, FAT_ENT_EOF, &fclus, &dclus);
+ if (ret < 0)
+ return ret;
+ inode->i_size = (fclus + 1) << sbi->cluster_bits;
+
+ return 0;
+}
+
+/* doesn't deal with root inode */
+static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+ int error;
+
+ MSDOS_I(inode)->i_pos = 0;
+ inode->i_uid = sbi->options.fs_uid;
+ inode->i_gid = sbi->options.fs_gid;
+ inode->i_version++;
+ inode->i_generation = get_seconds();
+
+ if ((de->attr & ATTR_DIR) && !IS_FREE(de->name)) {
+ inode->i_generation &= ~1;
+ inode->i_mode = MSDOS_MKMODE(de->attr,
+ S_IRWXUGO & ~sbi->options.fs_dmask) | S_IFDIR;
+ inode->i_op = sbi->dir_ops;
+ inode->i_fop = &fat_dir_operations;
+
+ MSDOS_I(inode)->i_start = le16_to_cpu(de->start);
+ if (sbi->fat_bits == 32)
+ MSDOS_I(inode)->i_start |= (le16_to_cpu(de->starthi) << 16);
+
+ MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start;
+ error = fat_calc_dir_size(inode);
+ if (error < 0)
+ return error;
+ MSDOS_I(inode)->mmu_private = inode->i_size;
+
+ inode->i_nlink = fat_subdirs(inode);
+ } else { /* not a directory */
+ inode->i_generation |= 1;
+ inode->i_mode = MSDOS_MKMODE(de->attr,
+ ((sbi->options.showexec &&
+ !is_exec(de->ext))
+ ? S_IRUGO|S_IWUGO : S_IRWXUGO)
+ & ~sbi->options.fs_fmask) | S_IFREG;
+ MSDOS_I(inode)->i_start = le16_to_cpu(de->start);
+ if (sbi->fat_bits == 32)
+ MSDOS_I(inode)->i_start |= (le16_to_cpu(de->starthi) << 16);
+
+ MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start;
+ inode->i_size = le32_to_cpu(de->size);
+ inode->i_op = &fat_file_inode_operations;
+ inode->i_fop = &fat_file_operations;
+ inode->i_mapping->a_ops = &fat_aops;
+ MSDOS_I(inode)->mmu_private = inode->i_size;
+ }
+ if (de->attr & ATTR_SYS) {
+ if (sbi->options.sys_immutable)
+ inode->i_flags |= S_IMMUTABLE;
+ }
+ MSDOS_I(inode)->i_attrs = de->attr & ATTR_UNUSED;
+ /* this is as close to the truth as we can get ... */
+ inode->i_blksize = sbi->cluster_size;
+ inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
+ & ~((loff_t)sbi->cluster_size - 1)) >> 9;
+ inode->i_mtime.tv_sec = inode->i_atime.tv_sec =
+ date_dos2unix(le16_to_cpu(de->time), le16_to_cpu(de->date));
+ inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = 0;
+ if (sbi->options.isvfat) {
+ int secs = de->ctime_cs / 100;
+ int csecs = de->ctime_cs % 100;
+ inode->i_ctime.tv_sec =
+ date_dos2unix(le16_to_cpu(de->ctime),
+ le16_to_cpu(de->cdate)) + secs;
+ inode->i_ctime.tv_nsec = csecs * 10000000;
+ } else
+ inode->i_ctime = inode->i_mtime;
+
+ return 0;
+}
+
+struct inode *fat_build_inode(struct super_block *sb,
+ struct msdos_dir_entry *de, loff_t i_pos)
+{
+ struct inode *inode;
+ int err;
+
+ inode = fat_iget(sb, i_pos);
+ if (inode)
+ goto out;
+ inode = new_inode(sb);
+ if (!inode) {
+ inode = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+ inode->i_ino = iunique(sb, MSDOS_ROOT_INO);
+ inode->i_version = 1;
+ err = fat_fill_inode(inode, de);
+ if (err) {
+ iput(inode);
+ inode = ERR_PTR(err);
+ goto out;
+ }
+ fat_attach(inode, i_pos);
+ insert_inode_hash(inode);
+out:
+ return inode;
+}
+
+EXPORT_SYMBOL(fat_build_inode);
+
+static void fat_delete_inode(struct inode *inode)
+{
+ if (!is_bad_inode(inode)) {
+ inode->i_size = 0;
+ fat_truncate(inode);
+ }
+ clear_inode(inode);
+}
+
+static void fat_clear_inode(struct inode *inode)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
+
+ if (is_bad_inode(inode))
+ return;
+ lock_kernel();
+ spin_lock(&sbi->inode_hash_lock);
+ fat_cache_inval_inode(inode);
+ hlist_del_init(&MSDOS_I(inode)->i_fat_hash);
+ spin_unlock(&sbi->inode_hash_lock);
+ unlock_kernel();
+}
+
+static void fat_put_super(struct super_block *sb)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+
+ if (!(sb->s_flags & MS_RDONLY))
+ fat_clusters_flush(sb);
+
+ if (sbi->nls_disk) {
+ unload_nls(sbi->nls_disk);
+ sbi->nls_disk = NULL;
+ sbi->options.codepage = fat_default_codepage;
+ }
+ if (sbi->nls_io) {
+ unload_nls(sbi->nls_io);
+ sbi->nls_io = NULL;
+ }
+ if (sbi->options.iocharset != fat_default_iocharset) {
+ kfree(sbi->options.iocharset);
+ sbi->options.iocharset = fat_default_iocharset;
+ }
+
+ sb->s_fs_info = NULL;
+ kfree(sbi);
+}
+
+static kmem_cache_t *fat_inode_cachep;
+
+static struct inode *fat_alloc_inode(struct super_block *sb)
+{
+ struct msdos_inode_info *ei;
+ ei = kmem_cache_alloc(fat_inode_cachep, SLAB_KERNEL);
+ if (!ei)
+ return NULL;
+ return &ei->vfs_inode;
+}
+
+static void fat_destroy_inode(struct inode *inode)
+{
+ kmem_cache_free(fat_inode_cachep, MSDOS_I(inode));
+}
+
+static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
+{
+ struct msdos_inode_info *ei = (struct msdos_inode_info *)foo;
+
+ if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+ SLAB_CTOR_CONSTRUCTOR) {
+ spin_lock_init(&ei->cache_lru_lock);
+ ei->nr_caches = 0;
+ ei->cache_valid_id = FAT_CACHE_VALID + 1;
+ INIT_LIST_HEAD(&ei->cache_lru);
+ INIT_HLIST_NODE(&ei->i_fat_hash);
+ inode_init_once(&ei->vfs_inode);
+ }
+}
+
+static int __init fat_init_inodecache(void)
+{
+ fat_inode_cachep = kmem_cache_create("fat_inode_cache",
+ sizeof(struct msdos_inode_info),
+ 0, SLAB_RECLAIM_ACCOUNT,
+ init_once, NULL);
+ if (fat_inode_cachep == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+static void __exit fat_destroy_inodecache(void)
+{
+ if (kmem_cache_destroy(fat_inode_cachep))
+ printk(KERN_INFO "fat_inode_cache: not all structures were freed\n");
+}
+
+static int fat_remount(struct super_block *sb, int *flags, char *data)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ *flags |= MS_NODIRATIME | (sbi->options.isvfat ? 0 : MS_NOATIME);
+ return 0;
+}
+
+static int fat_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+
+ /* If the count of free cluster is still unknown, counts it here. */
+ if (sbi->free_clusters == -1) {
+ int err = fat_count_free_clusters(sb);
+ if (err)
+ return err;
+ }
+
+ buf->f_type = sb->s_magic;
+ buf->f_bsize = sbi->cluster_size;
+ buf->f_blocks = sbi->max_cluster - FAT_START_ENT;
+ buf->f_bfree = sbi->free_clusters;
+ buf->f_bavail = sbi->free_clusters;
+ buf->f_namelen = sbi->options.isvfat ? 260 : 12;
+
+ return 0;
+}
+
+static int fat_write_inode(struct inode *inode, int wait)
+{
+ struct super_block *sb = inode->i_sb;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ struct buffer_head *bh;
+ struct msdos_dir_entry *raw_entry;
+ loff_t i_pos;
+ int err = 0;
+
+retry:
+ i_pos = MSDOS_I(inode)->i_pos;
+ if (inode->i_ino == MSDOS_ROOT_INO || !i_pos)
+ return 0;
+
+ lock_kernel();
+ bh = sb_bread(sb, i_pos >> sbi->dir_per_block_bits);
+ if (!bh) {
+ printk(KERN_ERR "FAT: unable to read inode block "
+ "for updating (i_pos %lld)\n", i_pos);
+ err = -EIO;
+ goto out;
+ }
+ spin_lock(&sbi->inode_hash_lock);
+ if (i_pos != MSDOS_I(inode)->i_pos) {
+ spin_unlock(&sbi->inode_hash_lock);
+ brelse(bh);
+ unlock_kernel();
+ goto retry;
+ }
+
+ raw_entry = &((struct msdos_dir_entry *) (bh->b_data))
+ [i_pos & (sbi->dir_per_block - 1)];
+ if (S_ISDIR(inode->i_mode))
+ raw_entry->size = 0;
+ else
+ raw_entry->size = cpu_to_le32(inode->i_size);
+ raw_entry->attr = fat_attr(inode);
+ raw_entry->start = cpu_to_le16(MSDOS_I(inode)->i_logstart);
+ raw_entry->starthi = cpu_to_le16(MSDOS_I(inode)->i_logstart >> 16);
+ fat_date_unix2dos(inode->i_mtime.tv_sec, &raw_entry->time, &raw_entry->date);
+ if (sbi->options.isvfat) {
+ fat_date_unix2dos(inode->i_ctime.tv_sec,&raw_entry->ctime,&raw_entry->cdate);
+ raw_entry->ctime_cs = (inode->i_ctime.tv_sec & 1) * 100 +
+ inode->i_ctime.tv_nsec / 10000000;
+ }
+ spin_unlock(&sbi->inode_hash_lock);
+ mark_buffer_dirty(bh);
+ if (wait)
+ err = sync_dirty_buffer(bh);
+ brelse(bh);
+out:
+ unlock_kernel();
+ return err;
+}
+
+int fat_sync_inode(struct inode *inode)
+{
+ return fat_write_inode(inode, 1);
+}
+
+EXPORT_SYMBOL(fat_sync_inode);
+
+static int fat_show_options(struct seq_file *m, struct vfsmount *mnt);
+static struct super_operations fat_sops = {
+ .alloc_inode = fat_alloc_inode,
+ .destroy_inode = fat_destroy_inode,
+ .write_inode = fat_write_inode,
+ .delete_inode = fat_delete_inode,
+ .put_super = fat_put_super,
+ .statfs = fat_statfs,
+ .clear_inode = fat_clear_inode,
+ .remount_fs = fat_remount,
+
+ .read_inode = make_bad_inode,
+
+ .show_options = fat_show_options,
+};
+
+/*
+ * a FAT file handle with fhtype 3 is
+ * 0/ i_ino - for fast, reliable lookup if still in the cache
+ * 1/ i_generation - to see if i_ino is still valid
+ * bit 0 == 0 iff directory
+ * 2/ i_pos(8-39) - if ino has changed, but still in cache
+ * 3/ i_pos(4-7)|i_logstart - to semi-verify inode found at i_pos
+ * 4/ i_pos(0-3)|parent->i_logstart - maybe used to hunt for the file on disc
+ *
+ * Hack for NFSv2: Maximum FAT entry number is 28bits and maximum
+ * i_pos is 40bits (blocknr(32) + dir offset(8)), so two 4bits
+ * of i_logstart is used to store the directory entry offset.
+ */
+
+static struct dentry *
+fat_decode_fh(struct super_block *sb, __u32 *fh, int len, int fhtype,
+ int (*acceptable)(void *context, struct dentry *de),
+ void *context)
+{
+ if (fhtype != 3)
+ return ERR_PTR(-ESTALE);
+ if (len < 5)
+ return ERR_PTR(-ESTALE);
+
+ return sb->s_export_op->find_exported_dentry(sb, fh, NULL, acceptable, context);
+}
+
+static struct dentry *fat_get_dentry(struct super_block *sb, void *inump)
+{
+ struct inode *inode = NULL;
+ struct dentry *result;
+ __u32 *fh = inump;
+
+ inode = iget(sb, fh[0]);
+ if (!inode || is_bad_inode(inode) || inode->i_generation != fh[1]) {
+ if (inode)
+ iput(inode);
+ inode = NULL;
+ }
+ if (!inode) {
+ loff_t i_pos;
+ int i_logstart = fh[3] & 0x0fffffff;
+
+ i_pos = (loff_t)fh[2] << 8;
+ i_pos |= ((fh[3] >> 24) & 0xf0) | (fh[4] >> 28);
+
+ /* try 2 - see if i_pos is in F-d-c
+ * require i_logstart to be the same
+ * Will fail if you truncate and then re-write
+ */
+
+ inode = fat_iget(sb, i_pos);
+ if (inode && MSDOS_I(inode)->i_logstart != i_logstart) {
+ iput(inode);
+ inode = NULL;
+ }
+ }
+ if (!inode) {
+ /* For now, do nothing
+ * What we could do is:
+ * follow the file starting at fh[4], and record
+ * the ".." entry, and the name of the fh[2] entry.
+ * The follow the ".." file finding the next step up.
+ * This way we build a path to the root of
+ * the tree. If this works, we lookup the path and so
+ * get this inode into the cache.
+ * Finally try the fat_iget lookup again
+ * If that fails, then weare totally out of luck
+ * But all that is for another day
+ */
+ }
+ if (!inode)
+ return ERR_PTR(-ESTALE);
+
+
+ /* now to find a dentry.
+ * If possible, get a well-connected one
+ */
+ result = d_alloc_anon(inode);
+ if (result == NULL) {
+ iput(inode);
+ return ERR_PTR(-ENOMEM);
+ }
+ result->d_op = sb->s_root->d_op;
+ return result;
+}
+
+static int
+fat_encode_fh(struct dentry *de, __u32 *fh, int *lenp, int connectable)
+{
+ int len = *lenp;
+ struct inode *inode = de->d_inode;
+ u32 ipos_h, ipos_m, ipos_l;
+
+ if (len < 5)
+ return 255; /* no room */
+
+ ipos_h = MSDOS_I(inode)->i_pos >> 8;
+ ipos_m = (MSDOS_I(inode)->i_pos & 0xf0) << 24;
+ ipos_l = (MSDOS_I(inode)->i_pos & 0x0f) << 28;
+ *lenp = 5;
+ fh[0] = inode->i_ino;
+ fh[1] = inode->i_generation;
+ fh[2] = ipos_h;
+ fh[3] = ipos_m | MSDOS_I(inode)->i_logstart;
+ spin_lock(&de->d_lock);
+ fh[4] = ipos_l | MSDOS_I(de->d_parent->d_inode)->i_logstart;
+ spin_unlock(&de->d_lock);
+ return 3;
+}
+
+static struct dentry *fat_get_parent(struct dentry *child)
+{
+ struct buffer_head *bh;
+ struct msdos_dir_entry *de;
+ loff_t i_pos;
+ struct dentry *parent;
+ struct inode *inode;
+ int err;
+
+ lock_kernel();
+
+ err = fat_get_dotdot_entry(child->d_inode, &bh, &de, &i_pos);
+ if (err) {
+ parent = ERR_PTR(err);
+ goto out;
+ }
+ inode = fat_build_inode(child->d_sb, de, i_pos);
+ brelse(bh);
+ if (IS_ERR(inode)) {
+ parent = ERR_PTR(PTR_ERR(inode));
+ goto out;
+ }
+ parent = d_alloc_anon(inode);
+ if (!parent) {
+ iput(inode);
+ parent = ERR_PTR(-ENOMEM);
+ }
+out:
+ unlock_kernel();
+
+ return parent;
+}
+
+static struct export_operations fat_export_ops = {
+ .decode_fh = fat_decode_fh,
+ .encode_fh = fat_encode_fh,
+ .get_dentry = fat_get_dentry,
+ .get_parent = fat_get_parent,
+};
+
+static int fat_show_options(struct seq_file *m, struct vfsmount *mnt)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(mnt->mnt_sb);
+ struct fat_mount_options *opts = &sbi->options;
+ int isvfat = opts->isvfat;
+
+ if (opts->fs_uid != 0)
+ seq_printf(m, ",uid=%u", opts->fs_uid);
+ if (opts->fs_gid != 0)
+ seq_printf(m, ",gid=%u", opts->fs_gid);
+ seq_printf(m, ",fmask=%04o", opts->fs_fmask);
+ seq_printf(m, ",dmask=%04o", opts->fs_dmask);
+ if (sbi->nls_disk)
+ seq_printf(m, ",codepage=%s", sbi->nls_disk->charset);
+ if (isvfat) {
+ if (sbi->nls_io)
+ seq_printf(m, ",iocharset=%s", sbi->nls_io->charset);
+
+ switch (opts->shortname) {
+ case VFAT_SFN_DISPLAY_WIN95 | VFAT_SFN_CREATE_WIN95:
+ seq_puts(m, ",shortname=win95");
+ break;
+ case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WINNT:
+ seq_puts(m, ",shortname=winnt");
+ break;
+ case VFAT_SFN_DISPLAY_WINNT | VFAT_SFN_CREATE_WIN95:
+ seq_puts(m, ",shortname=mixed");
+ break;
+ case VFAT_SFN_DISPLAY_LOWER | VFAT_SFN_CREATE_WIN95:
+ /* seq_puts(m, ",shortname=lower"); */
+ break;
+ default:
+ seq_puts(m, ",shortname=unknown");
+ break;
+ }
+ }
+ if (opts->name_check != 'n')
+ seq_printf(m, ",check=%c", opts->name_check);
+ if (opts->quiet)
+ seq_puts(m, ",quiet");
+ if (opts->showexec)
+ seq_puts(m, ",showexec");
+ if (opts->sys_immutable)
+ seq_puts(m, ",sys_immutable");
+ if (!isvfat) {
+ if (opts->dotsOK)
+ seq_puts(m, ",dotsOK=yes");
+ if (opts->nocase)
+ seq_puts(m, ",nocase");
+ } else {
+ if (opts->utf8)
+ seq_puts(m, ",utf8");
+ if (opts->unicode_xlate)
+ seq_puts(m, ",uni_xlate");
+ if (!opts->numtail)
+ seq_puts(m, ",nonumtail");
+ }
+
+ return 0;
+}
+
+enum {
+ Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid,
+ Opt_umask, Opt_dmask, Opt_fmask, Opt_codepage, Opt_nocase,
+ Opt_quiet, Opt_showexec, Opt_debug, Opt_immutable,
+ Opt_dots, Opt_nodots,
+ Opt_charset, Opt_shortname_lower, Opt_shortname_win95,
+ Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes,
+ Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes,
+ Opt_obsolate, Opt_err,
+};
+
+static match_table_t fat_tokens = {
+ {Opt_check_r, "check=relaxed"},
+ {Opt_check_s, "check=strict"},
+ {Opt_check_n, "check=normal"},
+ {Opt_check_r, "check=r"},
+ {Opt_check_s, "check=s"},
+ {Opt_check_n, "check=n"},
+ {Opt_uid, "uid=%u"},
+ {Opt_gid, "gid=%u"},
+ {Opt_umask, "umask=%o"},
+ {Opt_dmask, "dmask=%o"},
+ {Opt_fmask, "fmask=%o"},
+ {Opt_codepage, "codepage=%u"},
+ {Opt_nocase, "nocase"},
+ {Opt_quiet, "quiet"},
+ {Opt_showexec, "showexec"},
+ {Opt_debug, "debug"},
+ {Opt_immutable, "sys_immutable"},
+ {Opt_obsolate, "conv=binary"},
+ {Opt_obsolate, "conv=text"},
+ {Opt_obsolate, "conv=auto"},
+ {Opt_obsolate, "conv=b"},
+ {Opt_obsolate, "conv=t"},
+ {Opt_obsolate, "conv=a"},
+ {Opt_obsolate, "fat=%u"},
+ {Opt_obsolate, "blocksize=%u"},
+ {Opt_obsolate, "cvf_format=%20s"},
+ {Opt_obsolate, "cvf_options=%100s"},
+ {Opt_obsolate, "posix"},
+ {Opt_err, NULL}
+};
+static match_table_t msdos_tokens = {
+ {Opt_nodots, "nodots"},
+ {Opt_nodots, "dotsOK=no"},
+ {Opt_dots, "dots"},
+ {Opt_dots, "dotsOK=yes"},
+ {Opt_err, NULL}
+};
+static match_table_t vfat_tokens = {
+ {Opt_charset, "iocharset=%s"},
+ {Opt_shortname_lower, "shortname=lower"},
+ {Opt_shortname_win95, "shortname=win95"},
+ {Opt_shortname_winnt, "shortname=winnt"},
+ {Opt_shortname_mixed, "shortname=mixed"},
+ {Opt_utf8_no, "utf8=0"}, /* 0 or no or false */
+ {Opt_utf8_no, "utf8=no"},
+ {Opt_utf8_no, "utf8=false"},
+ {Opt_utf8_yes, "utf8=1"}, /* empty or 1 or yes or true */
+ {Opt_utf8_yes, "utf8=yes"},
+ {Opt_utf8_yes, "utf8=true"},
+ {Opt_utf8_yes, "utf8"},
+ {Opt_uni_xl_no, "uni_xlate=0"}, /* 0 or no or false */
+ {Opt_uni_xl_no, "uni_xlate=no"},
+ {Opt_uni_xl_no, "uni_xlate=false"},
+ {Opt_uni_xl_yes, "uni_xlate=1"}, /* empty or 1 or yes or true */
+ {Opt_uni_xl_yes, "uni_xlate=yes"},
+ {Opt_uni_xl_yes, "uni_xlate=true"},
+ {Opt_uni_xl_yes, "uni_xlate"},
+ {Opt_nonumtail_no, "nonumtail=0"}, /* 0 or no or false */
+ {Opt_nonumtail_no, "nonumtail=no"},
+ {Opt_nonumtail_no, "nonumtail=false"},
+ {Opt_nonumtail_yes, "nonumtail=1"}, /* empty or 1 or yes or true */
+ {Opt_nonumtail_yes, "nonumtail=yes"},
+ {Opt_nonumtail_yes, "nonumtail=true"},
+ {Opt_nonumtail_yes, "nonumtail"},
+ {Opt_err, NULL}
+};
+
+static int parse_options(char *options, int is_vfat, int *debug,
+ struct fat_mount_options *opts)
+{
+ char *p;
+ substring_t args[MAX_OPT_ARGS];
+ int option;
+ char *iocharset;
+
+ opts->isvfat = is_vfat;
+
+ opts->fs_uid = current->uid;
+ opts->fs_gid = current->gid;
+ opts->fs_fmask = opts->fs_dmask = current->fs->umask;
+ opts->codepage = fat_default_codepage;
+ opts->iocharset = fat_default_iocharset;
+ if (is_vfat)
+ opts->shortname = VFAT_SFN_DISPLAY_LOWER|VFAT_SFN_CREATE_WIN95;
+ else
+ opts->shortname = 0;
+ opts->name_check = 'n';
+ opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0;
+ opts->utf8 = opts->unicode_xlate = 0;
+ opts->numtail = 1;
+ opts->nocase = 0;
+ *debug = 0;
+
+ if (!options)
+ return 0;
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ int token;
+ if (!*p)
+ continue;
+
+ token = match_token(p, fat_tokens, args);
+ if (token == Opt_err) {
+ if (is_vfat)
+ token = match_token(p, vfat_tokens, args);
+ else
+ token = match_token(p, msdos_tokens, args);
+ }
+ switch (token) {
+ case Opt_check_s:
+ opts->name_check = 's';
+ break;
+ case Opt_check_r:
+ opts->name_check = 'r';
+ break;
+ case Opt_check_n:
+ opts->name_check = 'n';
+ break;
+ case Opt_nocase:
+ if (!is_vfat)
+ opts->nocase = 1;
+ else {
+ /* for backward compatibility */
+ opts->shortname = VFAT_SFN_DISPLAY_WIN95
+ | VFAT_SFN_CREATE_WIN95;
+ }
+ break;
+ case Opt_quiet:
+ opts->quiet = 1;
+ break;
+ case Opt_showexec:
+ opts->showexec = 1;
+ break;
+ case Opt_debug:
+ *debug = 1;
+ break;
+ case Opt_immutable:
+ opts->sys_immutable = 1;
+ break;
+ case Opt_uid:
+ if (match_int(&args[0], &option))
+ return 0;
+ opts->fs_uid = option;
+ break;
+ case Opt_gid:
+ if (match_int(&args[0], &option))
+ return 0;
+ opts->fs_gid = option;
+ break;
+ case Opt_umask:
+ if (match_octal(&args[0], &option))
+ return 0;
+ opts->fs_fmask = opts->fs_dmask = option;
+ break;
+ case Opt_dmask:
+ if (match_octal(&args[0], &option))
+ return 0;
+ opts->fs_dmask = option;
+ break;
+ case Opt_fmask:
+ if (match_octal(&args[0], &option))
+ return 0;
+ opts->fs_fmask = option;
+ break;
+ case Opt_codepage:
+ if (match_int(&args[0], &option))
+ return 0;
+ opts->codepage = option;
+ break;
+
+ /* msdos specific */
+ case Opt_dots:
+ opts->dotsOK = 1;
+ break;
+ case Opt_nodots:
+ opts->dotsOK = 0;
+ break;
+
+ /* vfat specific */
+ case Opt_charset:
+ if (opts->iocharset != fat_default_iocharset)
+ kfree(opts->iocharset);
+ iocharset = match_strdup(&args[0]);
+ if (!iocharset)
+ return -ENOMEM;
+ opts->iocharset = iocharset;
+ break;
+ case Opt_shortname_lower:
+ opts->shortname = VFAT_SFN_DISPLAY_LOWER
+ | VFAT_SFN_CREATE_WIN95;
+ break;
+ case Opt_shortname_win95:
+ opts->shortname = VFAT_SFN_DISPLAY_WIN95
+ | VFAT_SFN_CREATE_WIN95;
+ break;
+ case Opt_shortname_winnt:
+ opts->shortname = VFAT_SFN_DISPLAY_WINNT
+ | VFAT_SFN_CREATE_WINNT;
+ break;
+ case Opt_shortname_mixed:
+ opts->shortname = VFAT_SFN_DISPLAY_WINNT
+ | VFAT_SFN_CREATE_WIN95;
+ break;
+ case Opt_utf8_no: /* 0 or no or false */
+ opts->utf8 = 0;
+ break;
+ case Opt_utf8_yes: /* empty or 1 or yes or true */
+ opts->utf8 = 1;
+ break;
+ case Opt_uni_xl_no: /* 0 or no or false */
+ opts->unicode_xlate = 0;
+ break;
+ case Opt_uni_xl_yes: /* empty or 1 or yes or true */
+ opts->unicode_xlate = 1;
+ break;
+ case Opt_nonumtail_no: /* 0 or no or false */
+ opts->numtail = 1; /* negated option */
+ break;
+ case Opt_nonumtail_yes: /* empty or 1 or yes or true */
+ opts->numtail = 0; /* negated option */
+ break;
+
+ /* obsolete mount options */
+ case Opt_obsolate:
+ printk(KERN_INFO "FAT: \"%s\" option is obsolete, "
+ "not supported now\n", p);
+ break;
+ /* unknown option */
+ default:
+ printk(KERN_ERR "FAT: Unrecognized mount option \"%s\" "
+ "or missing value\n", p);
+ return -EINVAL;
+ }
+ }
+ /* UTF8 doesn't provide FAT semantics */
+ if (!strcmp(opts->iocharset, "utf8")) {
+ printk(KERN_ERR "FAT: utf8 is not a recommended IO charset"
+ " for FAT filesystems, filesystem will be case sensitive!\n");
+ }
+
+ if (opts->unicode_xlate)
+ opts->utf8 = 0;
+
+ return 0;
+}
+
+static int fat_read_root(struct inode *inode)
+{
+ struct super_block *sb = inode->i_sb;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ int error;
+
+ MSDOS_I(inode)->i_pos = 0;
+ inode->i_uid = sbi->options.fs_uid;
+ inode->i_gid = sbi->options.fs_gid;
+ inode->i_version++;
+ inode->i_generation = 0;
+ inode->i_mode = (S_IRWXUGO & ~sbi->options.fs_dmask) | S_IFDIR;
+ inode->i_op = sbi->dir_ops;
+ inode->i_fop = &fat_dir_operations;
+ if (sbi->fat_bits == 32) {
+ MSDOS_I(inode)->i_start = sbi->root_cluster;
+ error = fat_calc_dir_size(inode);
+ if (error < 0)
+ return error;
+ } else {
+ MSDOS_I(inode)->i_start = 0;
+ inode->i_size = sbi->dir_entries * sizeof(struct msdos_dir_entry);
+ }
+ inode->i_blksize = sbi->cluster_size;
+ inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
+ & ~((loff_t)sbi->cluster_size - 1)) >> 9;
+ MSDOS_I(inode)->i_logstart = 0;
+ MSDOS_I(inode)->mmu_private = inode->i_size;
+
+ MSDOS_I(inode)->i_attrs = ATTR_NONE;
+ inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0;
+ inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0;
+ inode->i_nlink = fat_subdirs(inode)+2;
+
+ return 0;
+}
+
+/*
+ * Read the super block of an MS-DOS FS.
+ */
+int fat_fill_super(struct super_block *sb, void *data, int silent,
+ struct inode_operations *fs_dir_inode_ops, int isvfat)
+{
+ struct inode *root_inode = NULL;
+ struct buffer_head *bh;
+ struct fat_boot_sector *b;
+ struct msdos_sb_info *sbi;
+ u16 logical_sector_size;
+ u32 total_sectors, total_clusters, fat_clusters, rootdir_sectors;
+ int debug;
+ unsigned int media;
+ long error;
+ char buf[50];
+
+ sbi = kmalloc(sizeof(struct msdos_sb_info), GFP_KERNEL);
+ if (!sbi)
+ return -ENOMEM;
+ sb->s_fs_info = sbi;
+ memset(sbi, 0, sizeof(struct msdos_sb_info));
+
+ sb->s_flags |= MS_NODIRATIME;
+ sb->s_magic = MSDOS_SUPER_MAGIC;
+ sb->s_op = &fat_sops;
+ sb->s_export_op = &fat_export_ops;
+ sbi->dir_ops = fs_dir_inode_ops;
+
+ error = parse_options(data, isvfat, &debug, &sbi->options);
+ if (error)
+ goto out_fail;
+
+ error = -EIO;
+ sb_min_blocksize(sb, 512);
+ bh = sb_bread(sb, 0);
+ if (bh == NULL) {
+ printk(KERN_ERR "FAT: unable to read boot sector\n");
+ goto out_fail;
+ }
+
+ b = (struct fat_boot_sector *) bh->b_data;
+ if (!b->reserved) {
+ if (!silent)
+ printk(KERN_ERR "FAT: bogus number of reserved sectors\n");
+ brelse(bh);
+ goto out_invalid;
+ }
+ if (!b->fats) {
+ if (!silent)
+ printk(KERN_ERR "FAT: bogus number of FAT structure\n");
+ brelse(bh);
+ goto out_invalid;
+ }
+
+ /*
+ * Earlier we checked here that b->secs_track and b->head are nonzero,
+ * but it turns out valid FAT filesystems can have zero there.
+ */
+
+ media = b->media;
+ if (!FAT_VALID_MEDIA(media)) {
+ if (!silent)
+ printk(KERN_ERR "FAT: invalid media value (0x%02x)\n",
+ media);
+ brelse(bh);
+ goto out_invalid;
+ }
+ logical_sector_size =
+ le16_to_cpu(get_unaligned((__le16 *)&b->sector_size));
+ if (!logical_sector_size
+ || (logical_sector_size & (logical_sector_size - 1))
+ || (logical_sector_size < 512)
+ || (PAGE_CACHE_SIZE < logical_sector_size)) {
+ if (!silent)
+ printk(KERN_ERR "FAT: bogus logical sector size %u\n",
+ logical_sector_size);
+ brelse(bh);
+ goto out_invalid;
+ }
+ sbi->sec_per_clus = b->sec_per_clus;
+ if (!sbi->sec_per_clus
+ || (sbi->sec_per_clus & (sbi->sec_per_clus - 1))) {
+ if (!silent)
+ printk(KERN_ERR "FAT: bogus sectors per cluster %u\n",
+ sbi->sec_per_clus);
+ brelse(bh);
+ goto out_invalid;
+ }
+
+ if (logical_sector_size < sb->s_blocksize) {
+ printk(KERN_ERR "FAT: logical sector size too small for device"
+ " (logical sector size = %u)\n", logical_sector_size);
+ brelse(bh);
+ goto out_fail;
+ }
+ if (logical_sector_size > sb->s_blocksize) {
+ brelse(bh);
+
+ if (!sb_set_blocksize(sb, logical_sector_size)) {
+ printk(KERN_ERR "FAT: unable to set blocksize %u\n",
+ logical_sector_size);
+ goto out_fail;
+ }
+ bh = sb_bread(sb, 0);
+ if (bh == NULL) {
+ printk(KERN_ERR "FAT: unable to read boot sector"
+ " (logical sector size = %lu)\n",
+ sb->s_blocksize);
+ goto out_fail;
+ }
+ b = (struct fat_boot_sector *) bh->b_data;
+ }
+
+ sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus;
+ sbi->cluster_bits = ffs(sbi->cluster_size) - 1;
+ sbi->fats = b->fats;
+ sbi->fat_bits = 0; /* Don't know yet */
+ sbi->fat_start = le16_to_cpu(b->reserved);
+ sbi->fat_length = le16_to_cpu(b->fat_length);
+ sbi->root_cluster = 0;
+ sbi->free_clusters = -1; /* Don't know yet */
+ sbi->prev_free = FAT_START_ENT;
+
+ if (!sbi->fat_length && b->fat32_length) {
+ struct fat_boot_fsinfo *fsinfo;
+ struct buffer_head *fsinfo_bh;
+
+ /* Must be FAT32 */
+ sbi->fat_bits = 32;
+ sbi->fat_length = le32_to_cpu(b->fat32_length);
+ sbi->root_cluster = le32_to_cpu(b->root_cluster);
+
+ sb->s_maxbytes = 0xffffffff;
+
+ /* MC - if info_sector is 0, don't multiply by 0 */
+ sbi->fsinfo_sector = le16_to_cpu(b->info_sector);
+ if (sbi->fsinfo_sector == 0)
+ sbi->fsinfo_sector = 1;
+
+ fsinfo_bh = sb_bread(sb, sbi->fsinfo_sector);
+ if (fsinfo_bh == NULL) {
+ printk(KERN_ERR "FAT: bread failed, FSINFO block"
+ " (sector = %lu)\n", sbi->fsinfo_sector);
+ brelse(bh);
+ goto out_fail;
+ }
+
+ fsinfo = (struct fat_boot_fsinfo *)fsinfo_bh->b_data;
+ if (!IS_FSINFO(fsinfo)) {
+ printk(KERN_WARNING
+ "FAT: Did not find valid FSINFO signature.\n"
+ " Found signature1 0x%08x signature2 0x%08x"
+ " (sector = %lu)\n",
+ le32_to_cpu(fsinfo->signature1),
+ le32_to_cpu(fsinfo->signature2),
+ sbi->fsinfo_sector);
+ } else {
+ sbi->free_clusters = le32_to_cpu(fsinfo->free_clusters);
+ sbi->prev_free = le32_to_cpu(fsinfo->next_cluster);
+ }
+
+ brelse(fsinfo_bh);
+ }
+
+ sbi->dir_per_block = sb->s_blocksize / sizeof(struct msdos_dir_entry);
+ sbi->dir_per_block_bits = ffs(sbi->dir_per_block) - 1;
+
+ sbi->dir_start = sbi->fat_start + sbi->fats * sbi->fat_length;
+ sbi->dir_entries =
+ le16_to_cpu(get_unaligned((__le16 *)&b->dir_entries));
+ if (sbi->dir_entries & (sbi->dir_per_block - 1)) {
+ if (!silent)
+ printk(KERN_ERR "FAT: bogus directroy-entries per block"
+ " (%u)\n", sbi->dir_entries);
+ brelse(bh);
+ goto out_invalid;
+ }
+
+ rootdir_sectors = sbi->dir_entries
+ * sizeof(struct msdos_dir_entry) / sb->s_blocksize;
+ sbi->data_start = sbi->dir_start + rootdir_sectors;
+ total_sectors = le16_to_cpu(get_unaligned((__le16 *)&b->sectors));
+ if (total_sectors == 0)
+ total_sectors = le32_to_cpu(b->total_sect);
+
+ total_clusters = (total_sectors - sbi->data_start) / sbi->sec_per_clus;
+
+ if (sbi->fat_bits != 32)
+ sbi->fat_bits = (total_clusters > MAX_FAT12) ? 16 : 12;
+
+ /* check that FAT table does not overflow */
+ fat_clusters = sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits;
+ total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT);
+ if (total_clusters > MAX_FAT(sb)) {
+ if (!silent)
+ printk(KERN_ERR "FAT: count of clusters too big (%u)\n",
+ total_clusters);
+ brelse(bh);
+ goto out_invalid;
+ }
+
+ sbi->max_cluster = total_clusters + FAT_START_ENT;
+ /* check the free_clusters, it's not necessarily correct */
+ if (sbi->free_clusters != -1 && sbi->free_clusters > total_clusters)
+ sbi->free_clusters = -1;
+ /* check the prev_free, it's not necessarily correct */
+ sbi->prev_free %= sbi->max_cluster;
+ if (sbi->prev_free < FAT_START_ENT)
+ sbi->prev_free = FAT_START_ENT;
+
+ brelse(bh);
+
+ /* set up enough so that it can read an inode */
+ fat_hash_init(sb);
+ fat_ent_access_init(sb);
+
+ /*
+ * The low byte of FAT's first entry must have same value with
+ * media-field. But in real world, too many devices is
+ * writing wrong value. So, removed that validity check.
+ *
+ * if (FAT_FIRST_ENT(sb, media) != first)
+ */
+
+ error = -EINVAL;
+ sprintf(buf, "cp%d", sbi->options.codepage);
+ sbi->nls_disk = load_nls(buf);
+ if (!sbi->nls_disk) {
+ printk(KERN_ERR "FAT: codepage %s not found\n", buf);
+ goto out_fail;
+ }
+
+ /* FIXME: utf8 is using iocharset for upper/lower conversion */
+ if (sbi->options.isvfat) {
+ sbi->nls_io = load_nls(sbi->options.iocharset);
+ if (!sbi->nls_io) {
+ printk(KERN_ERR "FAT: IO charset %s not found\n",
+ sbi->options.iocharset);
+ goto out_fail;
+ }
+ }
+
+ error = -ENOMEM;
+ root_inode = new_inode(sb);
+ if (!root_inode)
+ goto out_fail;
+ root_inode->i_ino = MSDOS_ROOT_INO;
+ root_inode->i_version = 1;
+ error = fat_read_root(root_inode);
+ if (error < 0)
+ goto out_fail;
+ error = -ENOMEM;
+ insert_inode_hash(root_inode);
+ sb->s_root = d_alloc_root(root_inode);
+ if (!sb->s_root) {
+ printk(KERN_ERR "FAT: get root inode failed\n");
+ goto out_fail;
+ }
+
+ return 0;
+
+out_invalid:
+ error = -EINVAL;
+ if (!silent)
+ printk(KERN_INFO "VFS: Can't find a valid FAT filesystem"
+ " on dev %s.\n", sb->s_id);
+
+out_fail:
+ if (root_inode)
+ iput(root_inode);
+ if (sbi->nls_io)
+ unload_nls(sbi->nls_io);
+ if (sbi->nls_disk)
+ unload_nls(sbi->nls_disk);
+ if (sbi->options.iocharset != fat_default_iocharset)
+ kfree(sbi->options.iocharset);
+ sb->s_fs_info = NULL;
+ kfree(sbi);
+ return error;
+}
+
+EXPORT_SYMBOL(fat_fill_super);
+
+int __init fat_cache_init(void);
+void __exit fat_cache_destroy(void);
+
+static int __init init_fat_fs(void)
+{
+ int ret;
+
+ ret = fat_cache_init();
+ if (ret < 0)
+ return ret;
+ return fat_init_inodecache();
+}
+
+static void __exit exit_fat_fs(void)
+{
+ fat_cache_destroy();
+ fat_destroy_inodecache();
+}
+
+module_init(init_fat_fs)
+module_exit(exit_fat_fs)
+
+MODULE_LICENSE("GPL");
diff --git a/fs/fat/misc.c b/fs/fat/misc.c
new file mode 100644
index 0000000..2a0df21
--- /dev/null
+++ b/fs/fat/misc.c
@@ -0,0 +1,225 @@
+/*
+ * linux/fs/fat/misc.c
+ *
+ * Written 1992,1993 by Werner Almesberger
+ * 22/11/2000 - Fixed fat_date_unix2dos for dates earlier than 01/01/1980
+ * and date_dos2unix for date==0 by Igor Zhbanov(bsg@uniyar.ac.ru)
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/msdos_fs.h>
+#include <linux/buffer_head.h>
+
+/*
+ * fat_fs_panic reports a severe file system problem and sets the file system
+ * read-only. The file system can be made writable again by remounting it.
+ */
+void fat_fs_panic(struct super_block *s, const char *fmt, ...)
+{
+ va_list args;
+
+ printk(KERN_ERR "FAT: Filesystem panic (dev %s)\n", s->s_id);
+
+ printk(KERN_ERR " ");
+ va_start(args, fmt);
+ vprintk(fmt, args);
+ va_end(args);
+ printk("\n");
+
+ if (!(s->s_flags & MS_RDONLY)) {
+ s->s_flags |= MS_RDONLY;
+ printk(KERN_ERR " File system has been set read-only\n");
+ }
+}
+
+EXPORT_SYMBOL(fat_fs_panic);
+
+/* Flushes the number of free clusters on FAT32 */
+/* XXX: Need to write one per FSINFO block. Currently only writes 1 */
+void fat_clusters_flush(struct super_block *sb)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ struct buffer_head *bh;
+ struct fat_boot_fsinfo *fsinfo;
+
+ if (sbi->fat_bits != 32)
+ return;
+
+ bh = sb_bread(sb, sbi->fsinfo_sector);
+ if (bh == NULL) {
+ printk(KERN_ERR "FAT: bread failed in fat_clusters_flush\n");
+ return;
+ }
+
+ fsinfo = (struct fat_boot_fsinfo *)bh->b_data;
+ /* Sanity check */
+ if (!IS_FSINFO(fsinfo)) {
+ printk(KERN_ERR "FAT: Did not find valid FSINFO signature.\n"
+ " Found signature1 0x%08x signature2 0x%08x"
+ " (sector = %lu)\n",
+ le32_to_cpu(fsinfo->signature1),
+ le32_to_cpu(fsinfo->signature2),
+ sbi->fsinfo_sector);
+ } else {
+ if (sbi->free_clusters != -1)
+ fsinfo->free_clusters = cpu_to_le32(sbi->free_clusters);
+ if (sbi->prev_free != -1)
+ fsinfo->next_cluster = cpu_to_le32(sbi->prev_free);
+ mark_buffer_dirty(bh);
+ if (sb->s_flags & MS_SYNCHRONOUS)
+ sync_dirty_buffer(bh);
+ }
+ brelse(bh);
+}
+
+/*
+ * fat_chain_add() adds a new cluster to the chain of clusters represented
+ * by inode.
+ */
+int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster)
+{
+ struct super_block *sb = inode->i_sb;
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ int ret, new_fclus, last;
+
+ /*
+ * We must locate the last cluster of the file to add this new
+ * one (new_dclus) to the end of the link list (the FAT).
+ */
+ last = new_fclus = 0;
+ if (MSDOS_I(inode)->i_start) {
+ int fclus, dclus;
+
+ ret = fat_get_cluster(inode, FAT_ENT_EOF, &fclus, &dclus);
+ if (ret < 0)
+ return ret;
+ new_fclus = fclus + 1;
+ last = dclus;
+ }
+
+ /* add new one to the last of the cluster chain */
+ if (last) {
+ struct fat_entry fatent;
+
+ fatent_init(&fatent);
+ ret = fat_ent_read(inode, &fatent, last);
+ if (ret >= 0) {
+ int wait = inode_needs_sync(inode);
+ ret = fat_ent_write(inode, &fatent, new_dclus, wait);
+ fatent_brelse(&fatent);
+ }
+ if (ret < 0)
+ return ret;
+// fat_cache_add(inode, new_fclus, new_dclus);
+ } else {
+ MSDOS_I(inode)->i_start = new_dclus;
+ MSDOS_I(inode)->i_logstart = new_dclus;
+ /*
+ * Since generic_osync_inode() synchronize later if
+ * this is not directory, we don't here.
+ */
+ if (S_ISDIR(inode->i_mode) && IS_DIRSYNC(inode)) {
+ ret = fat_sync_inode(inode);
+ if (ret)
+ return ret;
+ } else
+ mark_inode_dirty(inode);
+ }
+ if (new_fclus != (inode->i_blocks >> (sbi->cluster_bits - 9))) {
+ fat_fs_panic(sb, "clusters badly computed (%d != %lu)",
+ new_fclus, inode->i_blocks >> (sbi->cluster_bits - 9));
+ fat_cache_inval_inode(inode);
+ }
+ inode->i_blocks += nr_cluster << (sbi->cluster_bits - 9);
+
+ return 0;
+}
+
+extern struct timezone sys_tz;
+
+/* Linear day numbers of the respective 1sts in non-leap years. */
+static int day_n[] = {
+ /* Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec */
+ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0, 0
+};
+
+/* Convert a MS-DOS time/date pair to a UNIX date (seconds since 1 1 70). */
+int date_dos2unix(unsigned short time, unsigned short date)
+{
+ int month, year, secs;
+
+ /*
+ * first subtract and mask after that... Otherwise, if
+ * date == 0, bad things happen
+ */
+ month = ((date >> 5) - 1) & 15;
+ year = date >> 9;
+ secs = (time & 31)*2+60*((time >> 5) & 63)+(time >> 11)*3600+86400*
+ ((date & 31)-1+day_n[month]+(year/4)+year*365-((year & 3) == 0 &&
+ month < 2 ? 1 : 0)+3653);
+ /* days since 1.1.70 plus 80's leap day */
+ secs += sys_tz.tz_minuteswest*60;
+ return secs;
+}
+
+/* Convert linear UNIX date to a MS-DOS time/date pair. */
+void fat_date_unix2dos(int unix_date, __le16 *time, __le16 *date)
+{
+ int day, year, nl_day, month;
+
+ unix_date -= sys_tz.tz_minuteswest*60;
+
+ /* Jan 1 GMT 00:00:00 1980. But what about another time zone? */
+ if (unix_date < 315532800)
+ unix_date = 315532800;
+
+ *time = cpu_to_le16((unix_date % 60)/2+(((unix_date/60) % 60) << 5)+
+ (((unix_date/3600) % 24) << 11));
+ day = unix_date/86400-3652;
+ year = day/365;
+ if ((year+3)/4+365*year > day)
+ year--;
+ day -= (year+3)/4+365*year;
+ if (day == 59 && !(year & 3)) {
+ nl_day = day;
+ month = 2;
+ } else {
+ nl_day = (year & 3) || day <= 59 ? day : day-1;
+ for (month = 0; month < 12; month++) {
+ if (day_n[month] > nl_day)
+ break;
+ }
+ }
+ *date = cpu_to_le16(nl_day-day_n[month-1]+1+(month << 5)+(year << 9));
+}
+
+EXPORT_SYMBOL(fat_date_unix2dos);
+
+int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs)
+{
+ int i, e, err = 0;
+
+ for (i = 0; i < nr_bhs; i++) {
+ lock_buffer(bhs[i]);
+ if (test_clear_buffer_dirty(bhs[i])) {
+ get_bh(bhs[i]);
+ bhs[i]->b_end_io = end_buffer_write_sync;
+ e = submit_bh(WRITE, bhs[i]);
+ if (!err && e)
+ err = e;
+ } else
+ unlock_buffer(bhs[i]);
+ }
+ for (i = 0; i < nr_bhs; i++) {
+ wait_on_buffer(bhs[i]);
+ if (buffer_eopnotsupp(bhs[i])) {
+ clear_buffer_eopnotsupp(bhs[i]);
+ err = -EOPNOTSUPP;
+ } else if (!err && !buffer_uptodate(bhs[i]))
+ err = -EIO;
+ }
+ return err;
+}
+
+EXPORT_SYMBOL(fat_sync_bhs);