#include <linux/dirent.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
-
#include <asm/uaccess.h>
-static int fat_dir_ioctl(struct inode * inode, struct file * filp,
- unsigned int cmd, unsigned long arg);
-static int fat_readdir(struct file *filp, void *dirent, filldir_t filldir);
-
-struct file_operations fat_dir_operations = {
- .read = generic_read_dir,
- .readdir = fat_readdir,
- .ioctl = fat_dir_ioctl,
- .fsync = file_fsync,
-};
-
/*
* 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
* 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)
+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;
return (op - ascii);
}
-#if 0
-static void dump_de(struct msdos_dir_entry *de)
-{
- int i;
- unsigned char *p = (unsigned char *) de;
- printk("[");
-
- for (i = 0; i < 32; i++, p++) {
- printk("%02x ", *p);
- }
- printk("]\n");
-}
-#endif
-
static inline int
fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
{
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;
}
else if (opt & VFAT_SFN_DISPLAY_WINNT) {
if (lower)
len = fat_short2lower_uni(nls, buf, buf_size, uni_buf);
- else
+ else
len = fat_short2uni(nls, buf, buf_size, uni_buf);
} else
len = fat_short2uni(nls, buf, buf_size, uni_buf);
return res;
}
+EXPORT_SYMBOL(fat_search_long);
+
struct fat_ioctl_filldir_callback {
struct dirent __user *dirent;
int result;
int short_len;
};
-EXPORT_SYMBOL(fat_search_long);
-
static int fat_readdirx(struct inode *inode, struct file *filp, void *dirent,
filldir_t filldir, int short_only, int both)
{
int chi, chl, i, i2, j, last, last_u, dotoffset = 0;
loff_t i_pos, cpos;
int ret = 0;
-
+
lock_kernel();
cpos = filp->f_pos;
goto out;
}
- bh = NULL;
+ bh = NULL;
GetNew:
long_slots = 0;
if (fat_get_entry(inode,&cpos,&bh,&de,&i_pos) == -1)
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, loff_t *i_pos)
+{
+ while (fat_get_entry(dir, pos, bh, de, i_pos) >= 0) {
+ /* free entry or long name entry or volume label */
+ if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME))
+ return 0;
+ }
+ return -ENOENT;
+}
+
+/* See if directory is empty */
+int fat_dir_empty(struct inode *dir)
+{
+ struct buffer_head *bh;
+ struct msdos_dir_entry *de;
+ loff_t cpos, i_pos;
+ int result = 0;
+
+ bh = NULL;
+ cpos = 0;
+ while (fat_get_short_entry(dir, &cpos, &bh, &de, &i_pos) >= 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, i_pos;
+ int count = 0;
+
+ bh = NULL;
+ cpos = 0;
+ while (fat_get_short_entry(dir, &cpos, &bh, &de, &i_pos) >= 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 buffer_head **bh, struct msdos_dir_entry **de,
+ loff_t *i_pos)
+{
+ loff_t cpos;
+
+ *bh = NULL;
+ cpos = 0;
+ while (fat_get_short_entry(dir, &cpos, bh, de, i_pos) >= 0) {
+ if (!strncmp((*de)->name, name, MSDOS_NAME))
+ return 0;
+ }
+ return -ENOENT;
+}
+
+EXPORT_SYMBOL(fat_scan);
+
+static struct buffer_head *fat_extend_dir(struct inode *inode)
+{
+ struct super_block *sb = inode->i_sb;
+ struct buffer_head *bh, *res = NULL;
+ int nr, sec_per_clus = MSDOS_SB(sb)->sec_per_clus;
+ sector_t sector, last_sector;
+
+ if (MSDOS_SB(sb)->fat_bits != 32) {
+ if (inode->i_ino == MSDOS_ROOT_INO)
+ return ERR_PTR(-ENOSPC);
+ }
+
+ nr = fat_add_cluster(inode);
+ if (nr < 0)
+ return ERR_PTR(nr);
+
+ sector = ((sector_t)nr - 2) * sec_per_clus + MSDOS_SB(sb)->data_start;
+ last_sector = sector + sec_per_clus;
+ for ( ; sector < last_sector; sector++) {
+ if ((bh = sb_getblk(sb, sector))) {
+ memset(bh->b_data, 0, sb->s_blocksize);
+ set_buffer_uptodate(bh);
+ mark_buffer_dirty(bh);
+ if (!res)
+ res = bh;
+ else
+ brelse(bh);
+ }
+ }
+ if (res == NULL)
+ res = ERR_PTR(-EIO);
+ if (inode->i_size & (sb->s_blocksize - 1)) {
+ fat_fs_panic(sb, "Odd directory size");
+ inode->i_size = (inode->i_size + sb->s_blocksize)
+ & ~((loff_t)sb->s_blocksize - 1);
+ }
+ inode->i_size += MSDOS_SB(sb)->cluster_size;
+ MSDOS_I(inode)->mmu_private += MSDOS_SB(sb)->cluster_size;
+
+ return res;
+}
+
/* This assumes that size of cluster is above the 32*slots */
int fat_add_entries(struct inode *dir,int slots, struct buffer_head **bh,
offset = curr;
}
}
- if ((dir->i_ino == MSDOS_ROOT_INO) && (MSDOS_SB(sb)->fat_bits != 32))
+ if ((dir->i_ino == MSDOS_ROOT_INO) && (MSDOS_SB(sb)->fat_bits != 32))
return -ENOSPC;
new_bh = fat_extend_dir(dir);
if (IS_ERR(new_bh))
}
EXPORT_SYMBOL(fat_new_dir);
-
-static int fat_get_short_entry(struct inode *dir, loff_t *pos,
- struct buffer_head **bh,
- struct msdos_dir_entry **de, loff_t *i_pos)
-{
- while (fat_get_entry(dir, pos, bh, de, i_pos) >= 0) {
- /* free entry or long name entry or volume label */
- if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME))
- return 0;
- }
- return -ENOENT;
-}
-
-/* See if directory is empty */
-int fat_dir_empty(struct inode *dir)
-{
- struct buffer_head *bh;
- struct msdos_dir_entry *de;
- loff_t cpos, i_pos;
- int result = 0;
-
- bh = NULL;
- cpos = 0;
- while (fat_get_short_entry(dir, &cpos, &bh, &de, &i_pos) >= 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, i_pos;
- int count = 0;
-
- bh = NULL;
- cpos = 0;
- while (fat_get_short_entry(dir, &cpos, &bh, &de, &i_pos) >= 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 buffer_head **bh, struct msdos_dir_entry **de,
- loff_t *i_pos)
-{
- loff_t cpos;
-
- *bh = NULL;
- cpos = 0;
- while (fat_get_short_entry(dir, &cpos, bh, de, i_pos) >= 0) {
- if (!strncmp((*de)->name, name, MSDOS_NAME))
- return 0;
- }
- return -ENOENT;
-}
-
-EXPORT_SYMBOL(fat_scan);
*
* Fixes:
*
- * Max Cohan: Fixed invalid FSINFO offset when info_sector is 0
+ * Max Cohan: Fixed invalid FSINFO offset when info_sector is 0
*/
#include <linux/module.h>
static int fat_default_codepage = CONFIG_FAT_DEFAULT_CODEPAGE;
static char fat_default_iocharset[] = CONFIG_FAT_DEFAULT_IOCHARSET;
-static int fat_statfs(struct super_block *sb, struct kstatfs *buf);
-static int fat_write_inode(struct inode *inode, int wait);
+
+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))) {
+ int error;
+
+ error = fat_add_cluster(inode);
+ if (error < 0)
+ return error;
+ }
+ 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:
return inode;
}
-static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de);
+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 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 = 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;
+ inode->i_ctime.tv_sec =
+ MSDOS_SB(sb)->options.isvfat
+ ? date_dos2unix(le16_to_cpu(de->ctime), le16_to_cpu(de->cdate))
+ : inode->i_mtime.tv_sec;
+ inode->i_ctime.tv_nsec = de->ctime_ms * 1000000;
+ MSDOS_I(inode)->i_ctime_ms = de->ctime_ms;
+
+ return 0;
+}
struct inode *fat_build_inode(struct super_block *sb,
struct msdos_dir_entry *de, loff_t i_pos, int *res)
sbi->options.iocharset = fat_default_iocharset;
}
- sb->s_fs_info = NULL;
- kfree(sbi);
+ 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)
+{
+ *flags |= MS_NODIRATIME;
+ return 0;
+}
+
+static int fat_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+ int free, nr, ret;
+
+ if (MSDOS_SB(sb)->free_clusters != -1)
+ free = MSDOS_SB(sb)->free_clusters;
+ else {
+ lock_fat(sb);
+ if (MSDOS_SB(sb)->free_clusters != -1)
+ free = MSDOS_SB(sb)->free_clusters;
+ else {
+ free = 0;
+ for (nr = 2; nr < MSDOS_SB(sb)->clusters + 2; nr++) {
+ ret = fat_access(sb, nr, -1);
+ if (ret < 0) {
+ unlock_fat(sb);
+ return ret;
+ } else if (ret == FAT_ENT_FREE)
+ free++;
+ }
+ MSDOS_SB(sb)->free_clusters = free;
+ }
+ unlock_fat(sb);
+ }
+
+ buf->f_type = sb->s_magic;
+ buf->f_bsize = MSDOS_SB(sb)->cluster_size;
+ buf->f_blocks = MSDOS_SB(sb)->clusters;
+ buf->f_bfree = free;
+ buf->f_bavail = free;
+ buf->f_namelen = MSDOS_SB(sb)->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;
+
+retry:
+ i_pos = MSDOS_I(inode)->i_pos;
+ if (inode->i_ino == MSDOS_ROOT_INO || !i_pos) {
+ return 0;
+ }
+ lock_kernel();
+ if (!(bh = sb_bread(sb, i_pos >> sbi->dir_per_block_bits))) {
+ printk(KERN_ERR "FAT: unable to read inode block "
+ "for updating (i_pos %lld)\n", i_pos);
+ unlock_kernel();
+ return -EIO;
+ }
+ 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->attr = ATTR_DIR;
+ raw_entry->size = 0;
+ }
+ else {
+ raw_entry->attr = ATTR_NONE;
+ raw_entry->size = cpu_to_le32(inode->i_size);
+ }
+ raw_entry->attr |= MSDOS_MKATTR(inode->i_mode) |
+ MSDOS_I(inode)->i_attrs;
+ 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_ms = MSDOS_I(inode)->i_ctime_ms; /* use i_ctime.tv_nsec? */
+ }
+ spin_unlock(&sbi->inode_hash_lock);
+ mark_buffer_dirty(bh);
+ brelse(bh);
+ unlock_kernel();
+ return 0;
+}
+
+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=NULL;
+ struct msdos_dir_entry *de = NULL;
+ struct dentry *parent = NULL;
+ int res;
+ loff_t i_pos = 0;
+ struct inode *inode;
+
+ lock_kernel();
+ res = fat_scan(child->d_inode, MSDOS_DOTDOT, &bh, &de, &i_pos);
+
+ if (res < 0)
+ goto out;
+ inode = fat_build_inode(child->d_sb, de, i_pos, &res);
+ if (res)
+ goto out;
+ if (!inode)
+ res = -EACCES;
+ else {
+ parent = d_alloc_anon(inode);
+ if (!parent) {
+ iput(inode);
+ res = -ENOMEM;
+ }
+ }
+
+ out:
+ if(bh)
+ brelse(bh);
+ unlock_kernel();
+ if (res)
+ return ERR_PTR(res);
+ else
+ 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);
if (opts->unicode_xlate)
opts->utf8 = 0;
-
- 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;
}
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 = 0;
- 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;
- MSDOS_I(inode)->i_ctime_ms = 0;
- inode->i_nlink = fat_subdirs(inode)+2;
-
- return 0;
-}
-
-/*
- * 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=NULL;
- struct msdos_dir_entry *de = NULL;
- struct dentry *parent = NULL;
- int res;
- loff_t i_pos = 0;
- struct inode *inode;
-
- lock_kernel();
- res = fat_scan(child->d_inode, MSDOS_DOTDOT, &bh, &de, &i_pos);
-
- if (res < 0)
- goto out;
- inode = fat_build_inode(child->d_sb, de, i_pos, &res);
- if (res)
- goto out;
- if (!inode)
- res = -EACCES;
- else {
- parent = d_alloc_anon(inode);
- if (!parent) {
- iput(inode);
- res = -ENOMEM;
- }
- }
-
- out:
- if(bh)
- brelse(bh);
- unlock_kernel();
- if (res)
- return ERR_PTR(res);
- else
- return parent;
-}
-
-static kmem_cache_t *fat_inode_cachep;
-
-static struct inode *fat_alloc_inode(struct super_block *sb)
-{
- struct msdos_inode_info *ei;
- ei = (struct msdos_inode_info *)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);
- }
-}
-
-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;
-}
+ 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;
-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");
-}
+ MSDOS_I(inode)->i_attrs = 0;
+ 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;
+ MSDOS_I(inode)->i_ctime_ms = 0;
+ inode->i_nlink = fat_subdirs(inode)+2;
-static int fat_remount(struct super_block *sb, int *flags, char *data)
-{
- *flags |= MS_NODIRATIME;
return 0;
}
-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,
-};
-
-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,
-};
-
/*
* Read the super block of an MS-DOS FS.
*/
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)
EXPORT_SYMBOL(fat_fill_super);
-static int fat_statfs(struct super_block *sb, struct kstatfs *buf)
-{
- int free, nr, ret;
-
- if (MSDOS_SB(sb)->free_clusters != -1)
- free = MSDOS_SB(sb)->free_clusters;
- else {
- lock_fat(sb);
- if (MSDOS_SB(sb)->free_clusters != -1)
- free = MSDOS_SB(sb)->free_clusters;
- else {
- free = 0;
- for (nr = 2; nr < MSDOS_SB(sb)->clusters + 2; nr++) {
- ret = fat_access(sb, nr, -1);
- if (ret < 0) {
- unlock_fat(sb);
- return ret;
- } else if (ret == FAT_ENT_FREE)
- free++;
- }
- MSDOS_SB(sb)->free_clusters = free;
- }
- unlock_fat(sb);
- }
-
- buf->f_type = sb->s_magic;
- buf->f_bsize = MSDOS_SB(sb)->cluster_size;
- buf->f_blocks = MSDOS_SB(sb)->clusters;
- buf->f_bfree = free;
- buf->f_bavail = free;
- buf->f_namelen = MSDOS_SB(sb)->options.isvfat ? 260 : 12;
-
- return 0;
-}
-
-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_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
-};
-
-/* doesn't deal with root inode */
-static int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
-{
- 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 = 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;
- inode->i_ctime.tv_sec =
- MSDOS_SB(sb)->options.isvfat
- ? date_dos2unix(le16_to_cpu(de->ctime), le16_to_cpu(de->cdate))
- : inode->i_mtime.tv_sec;
- inode->i_ctime.tv_nsec = de->ctime_ms * 1000000;
- MSDOS_I(inode)->i_ctime_ms = de->ctime_ms;
-
- 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;
-
-retry:
- i_pos = MSDOS_I(inode)->i_pos;
- if (inode->i_ino == MSDOS_ROOT_INO || !i_pos) {
- return 0;
- }
- lock_kernel();
- if (!(bh = sb_bread(sb, i_pos >> sbi->dir_per_block_bits))) {
- printk(KERN_ERR "FAT: unable to read inode block "
- "for updating (i_pos %lld)\n", i_pos);
- unlock_kernel();
- return -EIO;
- }
- 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->attr = ATTR_DIR;
- raw_entry->size = 0;
- }
- else {
- raw_entry->attr = ATTR_NONE;
- raw_entry->size = cpu_to_le32(inode->i_size);
- }
- raw_entry->attr |= MSDOS_MKATTR(inode->i_mode) |
- MSDOS_I(inode)->i_attrs;
- 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_ms = MSDOS_I(inode)->i_ctime_ms; /* use i_ctime.tv_nsec? */
- }
- spin_unlock(&sbi->inode_hash_lock);
- mark_buffer_dirty(bh);
- brelse(bh);
- unlock_kernel();
- return 0;
-}
-
-
-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);
-
int __init fat_cache_init(void);
void __exit fat_cache_destroy(void);
#define MSDOS_DPB_BITS 4 /* log2(MSDOS_DPB) */
#define MSDOS_DPS (SECTOR_SIZE / sizeof(struct msdos_dir_entry))
#define MSDOS_DPS_BITS 4 /* log2(MSDOS_DPS) */
+#define CF_LE_W(v) le16_to_cpu(v)
+#define CF_LE_L(v) le32_to_cpu(v)
+#define CT_LE_W(v) cpu_to_le16(v)
+#define CT_LE_L(v) cpu_to_le32(v)
#define MSDOS_SUPER_MAGIC 0x4d44 /* MD */
#define FAT_MAX_DIR_ENTRIES (65536)
#define FAT_MAX_DIR_SIZE (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS)
-#define ATTR_NONE 0 /* no attribute bits */
-#define ATTR_RO 1 /* read-only */
-#define ATTR_HIDDEN 2 /* hidden */
-#define ATTR_SYS 4 /* system */
-#define ATTR_VOLUME 8 /* volume label */
-#define ATTR_DIR 16 /* directory */
-#define ATTR_ARCH 32 /* archived */
+#define ATTR_NONE 0 /* no attribute bits */
+#define ATTR_RO 1 /* read-only */
+#define ATTR_HIDDEN 2 /* hidden */
+#define ATTR_SYS 4 /* system */
+#define ATTR_VOLUME 8 /* volume label */
+#define ATTR_DIR 16 /* directory */
+#define ATTR_ARCH 32 /* archived */
/* attribute bits that are copied "as is" */
-#define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
+#define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
/* bits that are used by the Windows 95/Windows NT extended FAT */
-#define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
+#define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
-#define CASE_LOWER_BASE 8 /* base is lower case */
-#define CASE_LOWER_EXT 16 /* extension is lower case */
+#define CASE_LOWER_BASE 8 /* base is lower case */
+#define CASE_LOWER_EXT 16 /* extension is lower case */
-#define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */
-#define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG)
+#define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */
+#define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG)
/* valid file mode bits */
#define MSDOS_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO)
/* Convert attribute bits and a mask to the UNIX mode. */
#define MSDOS_MKMODE(a, m) (m & (a & ATTR_RO ? S_IRUGO|S_IXUGO : S_IRWXUGO))
/* Convert the UNIX mode to MS-DOS attribute bits. */
-#define MSDOS_MKATTR(m) ((m & S_IWUGO) ? ATTR_NONE : ATTR_RO)
+#define MSDOS_MKATTR(m) ((m & S_IWUGO) ? ATTR_NONE : ATTR_RO)
-#define MSDOS_NAME 11 /* maximum name length */
-#define MSDOS_LONGNAME 256 /* maximum name length */
-#define MSDOS_SLOTS 21 /* max # of slots needed for short and long names */
-#define MSDOS_DOT ". " /* ".", padded to MSDOS_NAME chars */
-#define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */
+#define MSDOS_NAME 11 /* maximum name length */
+#define MSDOS_LONGNAME 256 /* maximum name length */
+#define MSDOS_SLOTS 21 /* max # of slots for short and long names */
+#define MSDOS_DOT ". " /* ".", padded to MSDOS_NAME chars */
+#define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */
/* media of boot sector */
#define FAT_VALID_MEDIA(x) ((0xF8 <= (x) && (x) <= 0xFF) || (x) == 0xF0)
MSDOS_SB(s)->fat_bits == 16 ? 0xFF00 : 0xF00) | (x))
/* maximum number of clusters */
-#define MAX_FAT12 0xFF4
-#define MAX_FAT16 0xFFF4
-#define MAX_FAT32 0x0FFFFFF6
-#define MAX_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? MAX_FAT32 : \
+#define MAX_FAT12 0xFF4
+#define MAX_FAT16 0xFFF4
+#define MAX_FAT32 0x0FFFFFF6
+#define MAX_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? MAX_FAT32 : \
MSDOS_SB(s)->fat_bits == 16 ? MAX_FAT16 : MAX_FAT12)
/* bad cluster mark */
-#define BAD_FAT12 0xFF7
-#define BAD_FAT16 0xFFF7
-#define BAD_FAT32 0x0FFFFFF7
-#define BAD_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? BAD_FAT32 : \
+#define BAD_FAT12 0xFF7
+#define BAD_FAT16 0xFFF7
+#define BAD_FAT32 0x0FFFFFF7
+#define BAD_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? BAD_FAT32 : \
MSDOS_SB(s)->fat_bits == 16 ? BAD_FAT16 : BAD_FAT12)
/* standard EOF */
-#define EOF_FAT12 0xFFF
-#define EOF_FAT16 0xFFFF
-#define EOF_FAT32 0x0FFFFFFF
-#define EOF_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? EOF_FAT32 : \
+#define EOF_FAT12 0xFFF
+#define EOF_FAT16 0xFFFF
+#define EOF_FAT32 0x0FFFFFFF
+#define EOF_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? EOF_FAT32 : \
MSDOS_SB(s)->fat_bits == 16 ? EOF_FAT16 : EOF_FAT12)
#define FAT_ENT_FREE (0)
#define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct dirent [2])
#define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct dirent [2])
-/*
+/*
* vfat shortname flags
*/
#define VFAT_SFN_DISPLAY_LOWER 0x0001 /* convert to lowercase for display */
#define VFAT_SFN_CREATE_WIN95 0x0100 /* emulate win95 rule for create */
#define VFAT_SFN_CREATE_WINNT 0x0200 /* emulate winnt rule for create */
-/*
- * Conversion from and to little-endian byte order. (no-op on i386/i486)
- *
- * Naming: Ca_b_c, where a: F = from, T = to, b: LE = little-endian,
- * BE = big-endian, c: W = word (16 bits), L = longword (32 bits)
- */
-
-#define CF_LE_W(v) le16_to_cpu(v)
-#define CF_LE_L(v) le32_to_cpu(v)
-#define CT_LE_W(v) cpu_to_le16(v)
-#define CT_LE_L(v) cpu_to_le32(v)
-
struct fat_boot_sector {
__u8 ignored[3]; /* Boot strap short or near jump */
__u8 system_id[8]; /* Name - can be used to special case
__le16 ctime; /* Creation time */
__le16 cdate; /* Creation date */
__le16 adate; /* Last access date */
- __le16 starthi; /* High 16 bits of cluster in FAT32 */
+ __le16 starthi; /* High 16 bits of cluster in FAT32 */
__le16 time,date,start;/* time, date and first cluster */
__le32 size; /* file size (in bytes) */
};
};
struct vfat_slot_info {
- int long_slots; /* number of long slots in filename */
- loff_t longname_offset; /* dir offset for longname start */
- loff_t i_pos; /* on-disk position of directory entry */
+ int long_slots; /* number of long slots in filename */
+ loff_t longname_offset; /* dir offset for longname start */
+ loff_t i_pos; /* on-disk position of directory entry */
};
#ifdef __KERNEL__
unsigned int cache_valid_id;
loff_t mmu_private;
- int i_start; /* first cluster or 0 */
- int i_logstart; /* logical first cluster */
- int i_attrs; /* unused attribute bits */
- int i_ctime_ms; /* unused change time in milliseconds */
- loff_t i_pos; /* on-disk position of directory entry or 0 */
+ int i_start; /* first cluster or 0 */
+ int i_logstart; /* logical first cluster */
+ int i_attrs; /* unused attribute bits */
+ int i_ctime_ms; /* unused change time in milliseconds */
+ loff_t i_pos; /* on-disk position of directory entry or 0 */
struct hlist_node i_fat_hash; /* hash by i_location */
struct inode vfs_inode;
};
}
/* fat/cache.c */
-extern int fat_access(struct super_block *sb, int nr, int new_value);
-extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys);
extern void fat_cache_inval_inode(struct inode *inode);
+extern int fat_access(struct super_block *sb, int nr, int new_value);
extern int fat_get_cluster(struct inode *inode, int cluster,
int *fclus, int *dclus);
-extern int fat_free(struct inode *inode, int skip);
+extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys);
/* fat/dir.c */
extern struct file_operations fat_dir_operations;
extern int fat_search_long(struct inode *inode, const unsigned char *name,
int name_len, int anycase,
loff_t *spos, loff_t *lpos);
-extern int fat_add_entries(struct inode *dir, int slots, struct buffer_head **bh,
- struct msdos_dir_entry **de, loff_t *i_pos);
+extern int fat_add_entries(struct inode *dir, int slots,
+ struct buffer_head **bh,
+ struct msdos_dir_entry **de, loff_t *i_pos);
extern int fat_new_dir(struct inode *dir, struct inode *parent, int is_vfat);
extern int fat_dir_empty(struct inode *dir);
extern int fat_subdirs(struct inode *dir);
/* fat/file.c */
extern struct file_operations fat_file_operations;
extern struct inode_operations fat_file_inode_operations;
-extern int fat_get_block(struct inode *inode, sector_t iblock,
- struct buffer_head *bh_result, int create);
+extern int fat_notify_change(struct dentry * dentry, struct iattr * attr);
extern void fat_truncate(struct inode *inode);
/* fat/inode.c */
struct msdos_dir_entry *de, loff_t i_pos, int *res);
int fat_fill_super(struct super_block *sb, void *data, int silent,
struct inode_operations *fs_dir_inode_ops, int isvfat);
-extern int fat_notify_change(struct dentry * dentry, struct iattr * attr);
/* fat/misc.c */
extern void fat_fs_panic(struct super_block *s, const char *fmt, ...);
extern void unlock_fat(struct super_block *sb);
extern void fat_clusters_flush(struct super_block *sb);
extern int fat_add_cluster(struct inode *inode);
-extern struct buffer_head *fat_extend_dir(struct inode *inode);
extern int date_dos2unix(unsigned short time, unsigned short date);
extern void fat_date_unix2dos(int unix_date, __le16 *time, __le16 *date);
extern int fat__get_entry(struct inode *dir, loff_t *pos,
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