794 lines
20 KiB
C
794 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* 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>
|
|
#include <linux/magic.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/bitmap.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
/* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
|
|
|
|
static void mark_dirty(struct super_block *s, int remount)
|
|
{
|
|
if (hpfs_sb(s)->sb_chkdsk && (remount || !sb_rdonly(s))) {
|
|
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);
|
|
sync_dirty_buffer(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 (sb_rdonly(s)) return;
|
|
sync_blockdev(s->s_bdev);
|
|
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);
|
|
sync_dirty_buffer(bh);
|
|
brelse(bh);
|
|
}
|
|
}
|
|
|
|
/* Filesystem error... */
|
|
void hpfs_error(struct super_block *s, const char *fmt, ...)
|
|
{
|
|
struct va_format vaf;
|
|
va_list args;
|
|
|
|
va_start(args, fmt);
|
|
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
|
|
pr_err("filesystem error: %pV", &vaf);
|
|
|
|
va_end(args);
|
|
|
|
if (!hpfs_sb(s)->sb_was_error) {
|
|
if (hpfs_sb(s)->sb_err == 2) {
|
|
pr_cont("; crashing the system because you wanted it\n");
|
|
mark_dirty(s, 0);
|
|
panic("HPFS panic");
|
|
} else if (hpfs_sb(s)->sb_err == 1) {
|
|
if (sb_rdonly(s))
|
|
pr_cont("; already mounted read-only\n");
|
|
else {
|
|
pr_cont("; remounting read-only\n");
|
|
mark_dirty(s, 0);
|
|
s->s_flags |= SB_RDONLY;
|
|
}
|
|
} else if (sb_rdonly(s))
|
|
pr_cont("; going on - but anything won't be destroyed because it's read-only\n");
|
|
else
|
|
pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
|
|
} else
|
|
pr_cont("\n");
|
|
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 free_sbi(struct hpfs_sb_info *sbi)
|
|
{
|
|
kfree(sbi->sb_cp_table);
|
|
kfree(sbi->sb_bmp_dir);
|
|
kfree(sbi);
|
|
}
|
|
|
|
static void lazy_free_sbi(struct rcu_head *rcu)
|
|
{
|
|
free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
|
|
}
|
|
|
|
static void hpfs_put_super(struct super_block *s)
|
|
{
|
|
hpfs_lock(s);
|
|
unmark_dirty(s);
|
|
hpfs_unlock(s);
|
|
call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
|
|
}
|
|
|
|
static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
|
|
{
|
|
struct quad_buffer_head qbh;
|
|
unsigned long *bits;
|
|
unsigned count;
|
|
|
|
bits = hpfs_map_4sectors(s, secno, &qbh, 0);
|
|
if (!bits)
|
|
return (unsigned)-1;
|
|
count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
|
|
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 < COUNT_RD_AHEAD; n++) {
|
|
hpfs_prefetch_bitmap(s, n);
|
|
}
|
|
for (n = 0; n < n_bands; n++) {
|
|
unsigned c;
|
|
hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
|
|
c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
|
|
if (c != (unsigned)-1)
|
|
count += c;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
unsigned hpfs_get_free_dnodes(struct super_block *s)
|
|
{
|
|
struct hpfs_sb_info *sbi = hpfs_sb(s);
|
|
if (sbi->sb_n_free_dnodes == (unsigned)-1) {
|
|
unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
|
|
if (c == (unsigned)-1)
|
|
return 0;
|
|
sbi->sb_n_free_dnodes = c;
|
|
}
|
|
return sbi->sb_n_free_dnodes;
|
|
}
|
|
|
|
static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *s = dentry->d_sb;
|
|
struct hpfs_sb_info *sbi = hpfs_sb(s);
|
|
u64 id = huge_encode_dev(s->s_bdev->bd_dev);
|
|
|
|
hpfs_lock(s);
|
|
|
|
if (sbi->sb_n_free == (unsigned)-1)
|
|
sbi->sb_n_free = count_bitmaps(s);
|
|
|
|
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 = hpfs_get_free_dnodes(s);
|
|
buf->f_fsid = u64_to_fsid(id);
|
|
buf->f_namelen = 254;
|
|
|
|
hpfs_unlock(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg)
|
|
{
|
|
switch (cmd) {
|
|
case FITRIM: {
|
|
struct fstrim_range range;
|
|
secno n_trimmed;
|
|
int r;
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
|
|
return -EFAULT;
|
|
r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed);
|
|
if (r)
|
|
return r;
|
|
range.len = (u64)n_trimmed << 9;
|
|
if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
default: {
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static struct kmem_cache * hpfs_inode_cachep;
|
|
|
|
static struct inode *hpfs_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct hpfs_inode_info *ei;
|
|
ei = alloc_inode_sb(sb, hpfs_inode_cachep, GFP_NOFS);
|
|
if (!ei)
|
|
return NULL;
|
|
return &ei->vfs_inode;
|
|
}
|
|
|
|
static void hpfs_free_inode(struct inode *inode)
|
|
{
|
|
kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
|
|
}
|
|
|
|
static void init_once(void *foo)
|
|
{
|
|
struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
|
|
|
|
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|
|
|
SLAB_MEM_SPREAD|SLAB_ACCOUNT),
|
|
init_once);
|
|
if (hpfs_inode_cachep == NULL)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static void destroy_inodecache(void)
|
|
{
|
|
/*
|
|
* Make sure all delayed rcu free inodes are flushed before we
|
|
* destroy cache.
|
|
*/
|
|
rcu_barrier();
|
|
kmem_cache_destroy(hpfs_inode_cachep);
|
|
}
|
|
|
|
/*
|
|
* 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_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 const 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_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, kuid_t *uid, kgid_t *gid, umode_t *umask,
|
|
int *lowercase, int *eas, int *chk, int *errs,
|
|
int *chkdsk, int *timeshift)
|
|
{
|
|
char *p;
|
|
int option;
|
|
|
|
if (!opts)
|
|
return 1;
|
|
|
|
/*pr_info("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 = make_kuid(current_user_ns(), option);
|
|
if (!uid_valid(*uid))
|
|
return 0;
|
|
break;
|
|
case Opt_gid:
|
|
if (match_int(args, &option))
|
|
return 0;
|
|
*gid = make_kgid(current_user_ns(), option);
|
|
if (!gid_valid(*gid))
|
|
return 0;
|
|
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_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)
|
|
{
|
|
pr_info("\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\
|
|
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)
|
|
{
|
|
kuid_t uid;
|
|
kgid_t gid;
|
|
umode_t umask;
|
|
int lowercase, eas, chk, errs, chkdsk, timeshift;
|
|
int o;
|
|
struct hpfs_sb_info *sbi = hpfs_sb(s);
|
|
|
|
sync_filesystem(s);
|
|
|
|
*flags |= SB_NOATIME;
|
|
|
|
hpfs_lock(s);
|
|
uid = sbi->sb_uid; gid = sbi->sb_gid;
|
|
umask = 0777 & ~sbi->sb_mode;
|
|
lowercase = sbi->sb_lowercase;
|
|
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,
|
|
&eas, &chk, &errs, &chkdsk, ×hift))) {
|
|
pr_err("bad mount options.\n");
|
|
goto out_err;
|
|
}
|
|
if (o == 2) {
|
|
hpfs_help();
|
|
goto out_err;
|
|
}
|
|
if (timeshift != sbi->sb_timeshift) {
|
|
pr_err("timeshift can't be changed using remount.\n");
|
|
goto out_err;
|
|
}
|
|
|
|
unmark_dirty(s);
|
|
|
|
sbi->sb_uid = uid; sbi->sb_gid = gid;
|
|
sbi->sb_mode = 0777 & ~umask;
|
|
sbi->sb_lowercase = lowercase;
|
|
sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
|
|
sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
|
|
|
|
if (!(*flags & SB_RDONLY)) mark_dirty(s, 1);
|
|
|
|
hpfs_unlock(s);
|
|
return 0;
|
|
|
|
out_err:
|
|
hpfs_unlock(s);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int hpfs_show_options(struct seq_file *seq, struct dentry *root)
|
|
{
|
|
struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb);
|
|
|
|
seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid));
|
|
seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid));
|
|
seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777));
|
|
if (sbi->sb_lowercase)
|
|
seq_printf(seq, ",case=lower");
|
|
if (!sbi->sb_chk)
|
|
seq_printf(seq, ",check=none");
|
|
if (sbi->sb_chk == 2)
|
|
seq_printf(seq, ",check=strict");
|
|
if (!sbi->sb_err)
|
|
seq_printf(seq, ",errors=continue");
|
|
if (sbi->sb_err == 2)
|
|
seq_printf(seq, ",errors=panic");
|
|
if (!sbi->sb_chkdsk)
|
|
seq_printf(seq, ",chkdsk=no");
|
|
if (sbi->sb_chkdsk == 2)
|
|
seq_printf(seq, ",chkdsk=always");
|
|
if (!sbi->sb_eas)
|
|
seq_printf(seq, ",eas=no");
|
|
if (sbi->sb_eas == 1)
|
|
seq_printf(seq, ",eas=ro");
|
|
if (sbi->sb_timeshift)
|
|
seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift);
|
|
return 0;
|
|
}
|
|
|
|
/* Super operations */
|
|
|
|
static const struct super_operations hpfs_sops =
|
|
{
|
|
.alloc_inode = hpfs_alloc_inode,
|
|
.free_inode = hpfs_free_inode,
|
|
.evict_inode = hpfs_evict_inode,
|
|
.put_super = hpfs_put_super,
|
|
.statfs = hpfs_statfs,
|
|
.remount_fs = hpfs_remount_fs,
|
|
.show_options = hpfs_show_options,
|
|
};
|
|
|
|
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;
|
|
|
|
kuid_t uid;
|
|
kgid_t gid;
|
|
umode_t umask;
|
|
int lowercase, eas, chk, errs, chkdsk, timeshift;
|
|
|
|
dnode_secno root_dno;
|
|
struct hpfs_dirent *de = NULL;
|
|
struct quad_buffer_head qbh;
|
|
|
|
int o;
|
|
|
|
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
|
|
if (!sbi) {
|
|
return -ENOMEM;
|
|
}
|
|
s->s_fs_info = sbi;
|
|
|
|
mutex_init(&sbi->hpfs_mutex);
|
|
hpfs_lock(s);
|
|
|
|
uid = current_uid();
|
|
gid = current_gid();
|
|
umask = current_umask();
|
|
lowercase = 0;
|
|
eas = 2;
|
|
chk = 1;
|
|
errs = 1;
|
|
chkdsk = 1;
|
|
timeshift = 0;
|
|
|
|
if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
|
|
&eas, &chk, &errs, &chkdsk, ×hift))) {
|
|
pr_err("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 (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
|
|
||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
|
|
|| le32_to_cpu(spareblock->magic) != SP_MAGIC) {
|
|
if (!silent)
|
|
pr_err("Bad magic ... probably not HPFS\n");
|
|
goto bail4;
|
|
}
|
|
|
|
/* Check version */
|
|
if (!sb_rdonly(s) && superblock->funcversion != 2 && superblock->funcversion != 3) {
|
|
pr_err("Bad version %d,%d. Mount readonly to go around\n",
|
|
(int)superblock->version, (int)superblock->funcversion);
|
|
pr_err("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 |= SB_NOATIME;
|
|
|
|
/* Fill superblock stuff */
|
|
s->s_magic = HPFS_SUPER_MAGIC;
|
|
s->s_op = &hpfs_sops;
|
|
s->s_d_op = &hpfs_dentry_operations;
|
|
s->s_time_min = local_to_gmt(s, 0);
|
|
s->s_time_max = local_to_gmt(s, U32_MAX);
|
|
|
|
sbi->sb_root = le32_to_cpu(superblock->root);
|
|
sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
|
|
sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
|
|
sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
|
|
sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
|
|
sbi->sb_dmap = le32_to_cpu(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_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;
|
|
|
|
if (sbi->sb_fs_size >= 0x80000000) {
|
|
hpfs_error(s, "invalid size in superblock: %08x",
|
|
(unsigned)sbi->sb_fs_size);
|
|
goto bail4;
|
|
}
|
|
|
|
if (spareblock->n_spares_used)
|
|
hpfs_load_hotfix_map(s, spareblock);
|
|
|
|
/* Load bitmap directory */
|
|
if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
|
|
goto bail4;
|
|
|
|
/* Check for general fs errors*/
|
|
if (spareblock->dirty && !spareblock->old_wrote) {
|
|
if (errs == 2) {
|
|
pr_err("Improperly stopped, not mounted\n");
|
|
goto bail4;
|
|
}
|
|
hpfs_error(s, "improperly stopped");
|
|
}
|
|
|
|
if (!sb_rdonly(s)) {
|
|
spareblock->dirty = 1;
|
|
spareblock->old_wrote = 0;
|
|
mark_buffer_dirty(bh2);
|
|
}
|
|
|
|
if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
|
|
if (errs >= 2) {
|
|
pr_err("Spare dnodes used, try chkdsk\n");
|
|
mark_dirty(s, 0);
|
|
goto bail4;
|
|
}
|
|
hpfs_error(s, "warning: spare dnodes used, try chkdsk");
|
|
if (errs == 0)
|
|
pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
|
|
}
|
|
if (chk) {
|
|
unsigned a;
|
|
if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
|
|
le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
|
|
hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
|
|
le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
|
|
goto bail4;
|
|
}
|
|
a = sbi->sb_dirband_size;
|
|
sbi->sb_dirband_size = 0;
|
|
if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
|
|
hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
|
|
hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
|
|
mark_dirty(s, 0);
|
|
goto bail4;
|
|
}
|
|
sbi->sb_dirband_size = a;
|
|
} else
|
|
pr_err("You really don't want any checks? You are crazy...\n");
|
|
|
|
/* Load code page table */
|
|
if (le32_to_cpu(spareblock->n_code_pages))
|
|
if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
|
|
pr_err("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_make_root(root);
|
|
if (!s->s_root)
|
|
goto bail0;
|
|
|
|
/*
|
|
* 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, le32_to_cpu(de->read_date));
|
|
root->i_atime.tv_nsec = 0;
|
|
root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
|
|
root->i_mtime.tv_nsec = 0;
|
|
root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
|
|
root->i_ctime.tv_nsec = 0;
|
|
hpfs_i(root)->i_ea_size = le32_to_cpu(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);
|
|
}
|
|
hpfs_unlock(s);
|
|
return 0;
|
|
|
|
bail4: brelse(bh2);
|
|
bail3: brelse(bh1);
|
|
bail2: brelse(bh0);
|
|
bail1:
|
|
bail0:
|
|
hpfs_unlock(s);
|
|
free_sbi(sbi);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static struct dentry *hpfs_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
|
|
}
|
|
|
|
static struct file_system_type hpfs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "hpfs",
|
|
.mount = hpfs_mount,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
MODULE_ALIAS_FS("hpfs");
|
|
|
|
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");
|