1 files changed, 701 insertions, 0 deletions

diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
new file mode 100644
index 000000000000..8eefa6366db7
--- /dev/null
+++ b/fs/hpfs/super.c
@@ -0,0 +1,701 @@
+/*
+ *  linux/fs/hpfs/super.c
+ *
+ *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
+ *
+ *  mounting, unmounting, error handling
+ */
+
+#include "hpfs_fn.h"
+#include <linux/module.h>
+#include <linux/parser.h>
+#include <linux/init.h>
+#include <linux/statfs.h>
+
+/* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
+
+static void mark_dirty(struct super_block *s)
+{
+        if (hpfs_sb(s)->sb_chkdsk && !(s->s_flags & MS_RDONLY)) {
+                struct buffer_head *bh;
+                struct hpfs_spare_block *sb;
+                if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
+                        sb->dirty = 1;
+                        sb->old_wrote = 0;
+                        mark_buffer_dirty(bh);
+                        brelse(bh);
+                }
+        }
+}
+
+/* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
+   were errors) */
+
+static void unmark_dirty(struct super_block *s)
+{
+        struct buffer_head *bh;
+        struct hpfs_spare_block *sb;
+        if (s->s_flags & MS_RDONLY) return;
+        if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
+                sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
+                sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
+                mark_buffer_dirty(bh);
+                brelse(bh);
+        }
+}
+
+/* Filesystem error... */
+
+#define ERR_BUF_SIZE 1024
+
+void hpfs_error(struct super_block *s, char *m,...)
+{
+        char *buf;
+        va_list l;
+        va_start(l, m);
+        if (!(buf = kmalloc(ERR_BUF_SIZE, GFP_KERNEL)))
+                printk("HPFS: No memory for error message '%s'\n",m);
+        else if (vsprintf(buf, m, l) >= ERR_BUF_SIZE)
+                printk("HPFS: Grrrr... Kernel memory corrupted ... going on, but it'll crash very soon :-(\n");
+        printk("HPFS: filesystem error: ");
+        if (buf) printk("%s", buf);
+        else printk("%s\n",m);
+        if (!hpfs_sb(s)->sb_was_error) {
+                if (hpfs_sb(s)->sb_err == 2) {
+                        printk("; crashing the system because you wanted it\n");
+                        mark_dirty(s);
+                        panic("HPFS panic");
+                } else if (hpfs_sb(s)->sb_err == 1) {
+                        if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
+                        else {
+                                printk("; remounting read-only\n");
+                                mark_dirty(s);
+                                s->s_flags |= MS_RDONLY;
+                        }
+                } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
+                else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
+        } else printk("\n");
+        if (buf) kfree(buf);
+        hpfs_sb(s)->sb_was_error = 1;
+}
+
+/* 
+ * A little trick to detect cycles in many hpfs structures and don't let the
+ * kernel crash on corrupted filesystem. When first called, set c2 to 0.
+ *
+ * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
+ * nested each in other, chkdsk locked up happilly.
+ */
+
+int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
+                char *msg)
+{
+        if (*c2 && *c1 == key) {
+                hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
+                return 1;
+        }
+        (*c2)++;
+        if (!((*c2 - 1) & *c2)) *c1 = key;
+        return 0;
+}
+
+static void hpfs_put_super(struct super_block *s)
+{
+        struct hpfs_sb_info *sbi = hpfs_sb(s);
+        if (sbi->sb_cp_table) kfree(sbi->sb_cp_table);
+        if (sbi->sb_bmp_dir) kfree(sbi->sb_bmp_dir);
+        unmark_dirty(s);
+        s->s_fs_info = NULL;
+        kfree(sbi);
+}
+
+unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
+{
+        struct quad_buffer_head qbh;
+        unsigned *bits;
+        unsigned i, count;
+        if (!(bits = hpfs_map_4sectors(s, secno, &qbh, 4))) return 0;
+        count = 0;
+        for (i = 0; i < 2048 / sizeof(unsigned); i++) {
+                unsigned b; 
+                if (!bits[i]) continue;
+                for (b = bits[i]; b; b>>=1) count += b & 1;
+        }
+        hpfs_brelse4(&qbh);
+        return count;
+}
+
+static unsigned count_bitmaps(struct super_block *s)
+{
+        unsigned n, count, n_bands;
+        n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
+        count = 0;
+        for (n = 0; n < n_bands; n++)
+                count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]);
+        return count;
+}
+
+static int hpfs_statfs(struct super_block *s, struct kstatfs *buf)
+{
+        struct hpfs_sb_info *sbi = hpfs_sb(s);
+        lock_kernel();
+
+        /*if (sbi->sb_n_free == -1) {*/
+                sbi->sb_n_free = count_bitmaps(s);
+                sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
+        /*}*/
+        buf->f_type = s->s_magic;
+        buf->f_bsize = 512;
+        buf->f_blocks = sbi->sb_fs_size;
+        buf->f_bfree = sbi->sb_n_free;
+        buf->f_bavail = sbi->sb_n_free;
+        buf->f_files = sbi->sb_dirband_size / 4;
+        buf->f_ffree = sbi->sb_n_free_dnodes;
+        buf->f_namelen = 254;
+
+        unlock_kernel();
+
+        return 0;
+}
+
+static kmem_cache_t * hpfs_inode_cachep;
+
+static struct inode *hpfs_alloc_inode(struct super_block *sb)
+{
+        struct hpfs_inode_info *ei;
+        ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, SLAB_NOFS);
+        if (!ei)
+                return NULL;
+        ei->vfs_inode.i_version = 1;
+        return &ei->vfs_inode;
+}
+
+static void hpfs_destroy_inode(struct inode *inode)
+{
+        kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
+}
+
+static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
+{
+        struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
+
+        if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+            SLAB_CTOR_CONSTRUCTOR) {
+                init_MUTEX(&ei->i_sem);
+                init_MUTEX(&ei->i_parent);
+                inode_init_once(&ei->vfs_inode);
+        }
+}
+ 
+static int init_inodecache(void)
+{
+        hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
+                                             sizeof(struct hpfs_inode_info),
+                                             0, SLAB_RECLAIM_ACCOUNT,
+                                             init_once, NULL);
+        if (hpfs_inode_cachep == NULL)
+                return -ENOMEM;
+        return 0;
+}
+
+static void destroy_inodecache(void)
+{
+        if (kmem_cache_destroy(hpfs_inode_cachep))
+                printk(KERN_INFO "hpfs_inode_cache: not all structures were freed\n");
+}
+
+/*
+ * A tiny parser for option strings, stolen from dosfs.
+ * Stolen again from read-only hpfs.
+ * And updated for table-driven option parsing.
+ */
+
+enum {
+        Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
+        Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
+        Opt_check_none, Opt_check_normal, Opt_check_strict,
+        Opt_err_cont, Opt_err_ro, Opt_err_panic,
+        Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
+        Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
+        Opt_timeshift, Opt_err,
+};
+
+static match_table_t tokens = {
+        {Opt_help, "help"},
+        {Opt_uid, "uid=%u"},
+        {Opt_gid, "gid=%u"},
+        {Opt_umask, "umask=%o"},
+        {Opt_case_lower, "case=lower"},
+        {Opt_case_asis, "case=asis"},
+        {Opt_conv_binary, "conv=binary"},
+        {Opt_conv_text, "conv=text"},
+        {Opt_conv_auto, "conv=auto"},
+        {Opt_check_none, "check=none"},
+        {Opt_check_normal, "check=normal"},
+        {Opt_check_strict, "check=strict"},
+        {Opt_err_cont, "errors=continue"},
+        {Opt_err_ro, "errors=remount-ro"},
+        {Opt_err_panic, "errors=panic"},
+        {Opt_eas_no, "eas=no"},
+        {Opt_eas_ro, "eas=ro"},
+        {Opt_eas_rw, "eas=rw"},
+        {Opt_chkdsk_no, "chkdsk=no"},
+        {Opt_chkdsk_errors, "chkdsk=errors"},
+        {Opt_chkdsk_always, "chkdsk=always"},
+        {Opt_timeshift, "timeshift=%d"},
+        {Opt_err, NULL},
+};
+
+static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
+                      int *lowercase, int *conv, int *eas, int *chk, int *errs,
+                      int *chkdsk, int *timeshift)
+{
+        char *p;
+        int option;
+
+        if (!opts)
+                return 1;
+
+        /*printk("Parsing opts: '%s'\n",opts);*/
+
+        while ((p = strsep(&opts, ",")) != NULL) {
+                substring_t args[MAX_OPT_ARGS];
+                int token;
+                if (!*p)
+                        continue;
+
+                token = match_token(p, tokens, args);
+                switch (token) {
+                case Opt_help:
+                        return 2;
+                case Opt_uid:
+                        if (match_int(args, &option))
+                                return 0;
+                        *uid = option;
+                        break;
+                case Opt_gid:
+                        if (match_int(args, &option))
+                                return 0;
+                        *gid = option;
+                        break;
+                case Opt_umask:
+                        if (match_octal(args, &option))
+                                return 0;
+                        *umask = option;
+                        break;
+                case Opt_case_lower:
+                        *lowercase = 1;
+                        break;
+                case Opt_case_asis:
+                        *lowercase = 0;
+                        break;
+                case Opt_conv_binary:
+                        *conv = CONV_BINARY;
+                        break;
+                case Opt_conv_text:
+                        *conv = CONV_TEXT;
+                        break;
+                case Opt_conv_auto:
+                        *conv = CONV_AUTO;
+                        break;
+                case Opt_check_none:
+                        *chk = 0;
+                        break;
+                case Opt_check_normal:
+                        *chk = 1;
+                        break;
+                case Opt_check_strict:
+                        *chk = 2;
+                        break;
+                case Opt_err_cont:
+                        *errs = 0;
+                        break;
+                case Opt_err_ro:
+                        *errs = 1;
+                        break;
+                case Opt_err_panic:
+                        *errs = 2;
+                        break;
+                case Opt_eas_no:
+                        *eas = 0;
+                        break;
+                case Opt_eas_ro:
+                        *eas = 1;
+                        break;
+                case Opt_eas_rw:
+                        *eas = 2;
+                        break;
+                case Opt_chkdsk_no:
+                        *chkdsk = 0;
+                        break;
+                case Opt_chkdsk_errors:
+                        *chkdsk = 1;
+                        break;
+                case Opt_chkdsk_always:
+                        *chkdsk = 2;
+                        break;
+                case Opt_timeshift:
+                {
+                        int m = 1;
+                        char *rhs = args[0].from;
+                        if (!rhs || !*rhs)
+                                return 0;
+                        if (*rhs == '-') m = -1;
+                        if (*rhs == '+' || *rhs == '-') rhs++;
+                        *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
+                        if (*rhs)
+                                return 0;
+                        break;
+                }
+                default:
+                        return 0;
+                }
+        }
+        return 1;
+}
+
+static inline void hpfs_help(void)
+{
+        printk("\n\
+HPFS filesystem options:\n\
+      help              do not mount and display this text\n\
+      uid=xxx           set uid of files that don't have uid specified in eas\n\
+      gid=xxx           set gid of files that don't have gid specified in eas\n\
+      umask=xxx         set mode of files that don't have mode specified in eas\n\
+      case=lower        lowercase all files\n\
+      case=asis         do not lowercase files (default)\n\
+      conv=binary       do not convert CR/LF -> LF (default)\n\
+      conv=auto         convert only files with known text extensions\n\
+      conv=text         convert all files\n\
+      check=none        no fs checks - kernel may crash on corrupted filesystem\n\
+      check=normal      do some checks - it should not crash (default)\n\
+      check=strict      do extra time-consuming checks, used for debugging\n\
+      errors=continue   continue on errors\n\
+      errors=remount-ro remount read-only if errors found (default)\n\
+      errors=panic      panic on errors\n\
+      chkdsk=no         do not mark fs for chkdsking even if there were errors\n\
+      chkdsk=errors     mark fs dirty if errors found (default)\n\
+      chkdsk=always     always mark fs dirty - used for debugging\n\
+      eas=no            ignore extended attributes\n\
+      eas=ro            read but do not write extended attributes\n\
+      eas=rw            r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
+      timeshift=nnn     add nnn seconds to file times\n\
+\n");
+}
+
+static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
+{
+        uid_t uid;
+        gid_t gid;
+        umode_t umask;
+        int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
+        int o;
+        struct hpfs_sb_info *sbi = hpfs_sb(s);
+        
+        *flags |= MS_NOATIME;
+        
+        uid = sbi->sb_uid; gid = sbi->sb_gid;
+        umask = 0777 & ~sbi->sb_mode;
+        lowercase = sbi->sb_lowercase; conv = sbi->sb_conv;
+        eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
+        errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
+
+        if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv,
+            &eas, &chk, &errs, &chkdsk, &timeshift))) {
+                printk("HPFS: bad mount options.\n");
+                return 1;
+        }
+        if (o == 2) {
+                hpfs_help();
+                return 1;
+        }
+        if (timeshift != sbi->sb_timeshift) {
+                printk("HPFS: timeshift can't be changed using remount.\n");
+                return 1;
+        }
+
+        unmark_dirty(s);
+
+        sbi->sb_uid = uid; sbi->sb_gid = gid;
+        sbi->sb_mode = 0777 & ~umask;
+        sbi->sb_lowercase = lowercase; sbi->sb_conv = conv;
+        sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
+        sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
+
+        if (!(*flags & MS_RDONLY)) mark_dirty(s);
+
+        return 0;
+}
+
+/* Super operations */
+
+static struct super_operations hpfs_sops =
+{
+        .alloc_inode    = hpfs_alloc_inode,
+        .destroy_inode  = hpfs_destroy_inode,
+        .delete_inode   = hpfs_delete_inode,
+        .put_super      = hpfs_put_super,
+        .statfs         = hpfs_statfs,
+        .remount_fs     = hpfs_remount_fs,
+};
+
+static int hpfs_fill_super(struct super_block *s, void *options, int silent)
+{
+        struct buffer_head *bh0, *bh1, *bh2;
+        struct hpfs_boot_block *bootblock;
+        struct hpfs_super_block *superblock;
+        struct hpfs_spare_block *spareblock;
+        struct hpfs_sb_info *sbi;
+        struct inode *root;
+
+        uid_t uid;
+        gid_t gid;
+        umode_t umask;
+        int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
+
+        dnode_secno root_dno;
+        struct hpfs_dirent *de = NULL;
+        struct quad_buffer_head qbh;
+
+        int o;
+
+        sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
+        if (!sbi)
+                return -ENOMEM;
+        s->s_fs_info = sbi;
+        memset(sbi, 0, sizeof(*sbi));
+
+        sbi->sb_bmp_dir = NULL;
+        sbi->sb_cp_table = NULL;
+
+        init_MUTEX(&sbi->hpfs_creation_de);
+
+        uid = current->uid;
+        gid = current->gid;
+        umask = current->fs->umask;
+        lowercase = 0;
+        conv = CONV_BINARY;
+        eas = 2;
+        chk = 1;
+        errs = 1;
+        chkdsk = 1;
+        timeshift = 0;
+
+        if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
+            &eas, &chk, &errs, &chkdsk, &timeshift))) {
+                printk("HPFS: bad mount options.\n");
+                goto bail0;
+        }
+        if (o==2) {
+                hpfs_help();
+                goto bail0;
+        }
+
+        /*sbi->sb_mounting = 1;*/
+        sb_set_blocksize(s, 512);
+        sbi->sb_fs_size = -1;
+        if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
+        if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
+        if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
+
+        /* Check magics */
+        if (/*bootblock->magic != BB_MAGIC
+            ||*/ superblock->magic != SB_MAGIC
+            || spareblock->magic != SP_MAGIC) {
+                if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
+                goto bail4;
+        }
+
+        /* Check version */
+        if (!(s->s_flags & MS_RDONLY) &&
+              superblock->funcversion != 2 && superblock->funcversion != 3) {
+                printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
+                        (int)superblock->version, (int)superblock->funcversion);
+                printk("HPFS: please try recent version of HPFS driver at http://artax.karlin.mff.cuni.cz/~mikulas/vyplody/hpfs/index-e.cgi and if it still can't understand this format, contact author - mikulas@artax.karlin.mff.cuni.cz\n");
+                goto bail4;
+        }
+
+        s->s_flags |= MS_NOATIME;
+
+        /* Fill superblock stuff */
+        s->s_magic = HPFS_SUPER_MAGIC;
+        s->s_op = &hpfs_sops;
+
+        sbi->sb_root = superblock->root;
+        sbi->sb_fs_size = superblock->n_sectors;
+        sbi->sb_bitmaps = superblock->bitmaps;
+        sbi->sb_dirband_start = superblock->dir_band_start;
+        sbi->sb_dirband_size = superblock->n_dir_band;
+        sbi->sb_dmap = superblock->dir_band_bitmap;
+        sbi->sb_uid = uid;
+        sbi->sb_gid = gid;
+        sbi->sb_mode = 0777 & ~umask;
+        sbi->sb_n_free = -1;
+        sbi->sb_n_free_dnodes = -1;
+        sbi->sb_lowercase = lowercase;
+        sbi->sb_conv = conv;
+        sbi->sb_eas = eas;
+        sbi->sb_chk = chk;
+        sbi->sb_chkdsk = chkdsk;
+        sbi->sb_err = errs;
+        sbi->sb_timeshift = timeshift;
+        sbi->sb_was_error = 0;
+        sbi->sb_cp_table = NULL;
+        sbi->sb_c_bitmap = -1;
+        sbi->sb_max_fwd_alloc = 0xffffff;
+        
+        /* Load bitmap directory */
+        if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
+                goto bail4;
+        
+        /* Check for general fs errors*/
+        if (spareblock->dirty && !spareblock->old_wrote) {
+                if (errs == 2) {
+                        printk("HPFS: Improperly stopped, not mounted\n");
+                        goto bail4;
+                }
+                hpfs_error(s, "improperly stopped");
+        }
+
+        if (!(s->s_flags & MS_RDONLY)) {
+                spareblock->dirty = 1;
+                spareblock->old_wrote = 0;
+                mark_buffer_dirty(bh2);
+        }
+
+        if (spareblock->hotfixes_used || spareblock->n_spares_used) {
+                if (errs >= 2) {
+                        printk("HPFS: Hotfixes not supported here, try chkdsk\n");
+                        mark_dirty(s);
+                        goto bail4;
+                }
+                hpfs_error(s, "hotfixes not supported here, try chkdsk");
+                if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
+                else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
+        }
+        if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
+                if (errs >= 2) {
+                        printk("HPFS: Spare dnodes used, try chkdsk\n");
+                        mark_dirty(s);
+                        goto bail4;
+                }
+                hpfs_error(s, "warning: spare dnodes used, try chkdsk");
+                if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
+        }
+        if (chk) {
+                unsigned a;
+                if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
+                    superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
+                        hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
+                                superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
+                        goto bail4;
+                }
+                a = sbi->sb_dirband_size;
+                sbi->sb_dirband_size = 0;
+                if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
+                    hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
+                    hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
+                        mark_dirty(s);
+                        goto bail4;
+                }
+                sbi->sb_dirband_size = a;
+        } else printk("HPFS: You really don't want any checks? You are crazy...\n");
+
+        /* Load code page table */
+        if (spareblock->n_code_pages)
+                if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
+                        printk("HPFS: Warning: code page support is disabled\n");
+
+        brelse(bh2);
+        brelse(bh1);
+        brelse(bh0);
+
+        root = iget_locked(s, sbi->sb_root);
+        if (!root)
+                goto bail0;
+        hpfs_init_inode(root);
+        hpfs_read_inode(root);
+        unlock_new_inode(root);
+        s->s_root = d_alloc_root(root);
+        if (!s->s_root) {
+                iput(root);
+                goto bail0;
+        }
+        hpfs_set_dentry_operations(s->s_root);
+
+        /*
+         * find the root directory's . pointer & finish filling in the inode
+         */
+
+        root_dno = hpfs_fnode_dno(s, sbi->sb_root);
+        if (root_dno)
+                de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
+        if (!de)
+                hpfs_error(s, "unable to find root dir");
+        else {
+                root->i_atime.tv_sec = local_to_gmt(s, de->read_date);
+                root->i_atime.tv_nsec = 0;
+                root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
+                root->i_mtime.tv_nsec = 0;
+                root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
+                root->i_ctime.tv_nsec = 0;
+                hpfs_i(root)->i_ea_size = de->ea_size;
+                hpfs_i(root)->i_parent_dir = root->i_ino;
+                if (root->i_size == -1)
+                        root->i_size = 2048;
+                if (root->i_blocks == -1)
+                        root->i_blocks = 5;
+                hpfs_brelse4(&qbh);
+        }
+        return 0;
+
+bail4:  brelse(bh2);
+bail3:  brelse(bh1);
+bail2:  brelse(bh0);
+bail1:
+bail0:
+        if (sbi->sb_bmp_dir) kfree(sbi->sb_bmp_dir);
+        if (sbi->sb_cp_table) kfree(sbi->sb_cp_table);
+        s->s_fs_info = NULL;
+        kfree(sbi);
+        return -EINVAL;
+}
+
+static struct super_block *hpfs_get_sb(struct file_system_type *fs_type,
+        int flags, const char *dev_name, void *data)
+{
+        return get_sb_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
+}
+
+static struct file_system_type hpfs_fs_type = {
+        .owner          = THIS_MODULE,
+        .name           = "hpfs",
+        .get_sb         = hpfs_get_sb,
+        .kill_sb        = kill_block_super,
+        .fs_flags       = FS_REQUIRES_DEV,
+};
+
+static int __init init_hpfs_fs(void)
+{
+        int err = init_inodecache();
+        if (err)
+                goto out1;
+        err = register_filesystem(&hpfs_fs_type);
+        if (err)
+                goto out;
+        return 0;
+out:
+        destroy_inodecache();
+out1:
+        return err;
+}
+
+static void __exit exit_hpfs_fs(void)
+{
+        unregister_filesystem(&hpfs_fs_type);
+        destroy_inodecache();
+}
+
+module_init(init_hpfs_fs)
+module_exit(exit_hpfs_fs)
+MODULE_LICENSE("GPL");