From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001
From: Steven Rostedt <rostedt@goodmis.org>
Date: Wed, 2 Sep 2026 09:55:01 -0400
Subject: ftrace: Synchronize the initialization of ftrace_ops

There's some internal state that ftrace_ops needs to have set, but since
it can be declared outside of the ftrace.c code, it calls
ftrace_ops_init() on the ops in every global function. The issue is that
if two tasks call it on the same ops at the same time it is possible to
have the initialization of one corrupt the initialization of the other
call.

Create a ops_mutex to use to synchronize every initialization of the
ftrace_ops. The mutex is taken within checking the ftrace_ops flag that
states it was initializied but the flag is checked again after the mutex
has been taken. Checking first outside the mutex allows it to shortcut
having to take the mutex. But then the check needs to be done again after
the mute is taken in case of races.

Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home
Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock")
Reported-by: sashiko-bot@kernel.org
Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 fs/hpfs/super.c | 789 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 789 insertions(+)
 create mode 100644 fs/hpfs/super.c

(limited to 'fs/hpfs/super.c')

diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
new file mode 100644
index 000000000..8fbdbf080
--- /dev/null
+++ b/fs/hpfs/super.c
@@ -0,0 +1,789 @@
+// 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/fs_struct.h>
+#include <linux/fs_context.h>
+#include <linux/fs_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_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);
+}
+
+enum {
+	Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case,
+	Opt_check, Opt_err, Opt_eas, Opt_chkdsk, Opt_timeshift,
+};
+
+static const struct constant_table hpfs_param_case[] = {
+	{"asis",	0},
+	{"lower",	1},
+	{}
+};
+
+static const struct constant_table hpfs_param_check[] = {
+	{"none",	0},
+	{"normal",	1},
+	{"strict",	2},
+	{}
+};
+
+static const struct constant_table hpfs_param_err[] = {
+	{"continue",	0},
+	{"remount-ro",	1},
+	{"panic",	2},
+	{}
+};
+
+static const struct constant_table hpfs_param_eas[] = {
+	{"no",		0},
+	{"ro",		1},
+	{"rw",		2},
+	{}
+};
+
+static const struct constant_table hpfs_param_chkdsk[] = {
+	{"no",		0},
+	{"errors",	1},
+	{"always",	2},
+	{}
+};
+
+static const struct fs_parameter_spec hpfs_param_spec[] = {
+	fsparam_flag	("help",	Opt_help),
+	fsparam_uid	("uid",		Opt_uid),
+	fsparam_gid	("gid",		Opt_gid),
+	fsparam_u32oct	("umask",	Opt_umask),
+	fsparam_enum	("case",	Opt_case,	hpfs_param_case),
+	fsparam_enum	("check",	Opt_check,	hpfs_param_check),
+	fsparam_enum	("errors",	Opt_err,	hpfs_param_err),
+	fsparam_enum	("eas",		Opt_eas,	hpfs_param_eas),
+	fsparam_enum	("chkdsk",	Opt_chkdsk,	hpfs_param_chkdsk),
+	fsparam_s32	("timeshift",	Opt_timeshift),
+	{}
+};
+
+struct hpfs_fc_context {
+	kuid_t uid;
+	kgid_t gid;
+	umode_t umask;
+	int lowercase;
+	int eas;
+	int chk;
+	int errs;
+	int chkdsk;
+	int timeshift;
+};
+
+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_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+	struct hpfs_fc_context *ctx = fc->fs_private;
+	struct fs_parse_result result;
+	int opt;
+
+	opt = fs_parse(fc, hpfs_param_spec, param, &result);
+	if (opt < 0)
+		return opt;
+
+	switch (opt) {
+	case Opt_help:
+		hpfs_help();
+		return -EINVAL;
+	case Opt_uid:
+		ctx->uid = result.uid;
+		break;
+	case Opt_gid:
+		ctx->gid = result.gid;
+		break;
+	case Opt_umask:
+		ctx->umask = result.uint_32;
+		break;
+	case Opt_case:
+		ctx->lowercase = result.uint_32;
+		break;
+	case Opt_check:
+		ctx->chk = result.uint_32;
+		break;
+	case Opt_err:
+		ctx->errs = result.uint_32;
+		break;
+	case Opt_eas:
+		ctx->eas = result.uint_32;
+		break;
+	case Opt_chkdsk:
+		ctx->chkdsk = result.uint_32;
+		break;
+	case Opt_timeshift:
+		{
+			char *rhs = param->string;
+			int timeshift;
+
+			if (kstrtoint(rhs, 0, &timeshift))
+				return -EINVAL;
+			ctx->timeshift = timeshift;
+			break;
+		}
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int hpfs_reconfigure(struct fs_context *fc)
+{
+	struct hpfs_fc_context *ctx = fc->fs_private;
+	struct super_block *s = fc->root->d_sb;
+	struct hpfs_sb_info *sbi = hpfs_sb(s);
+
+	sync_filesystem(s);
+
+	fc->sb_flags |= SB_NOATIME;
+
+	hpfs_lock(s);
+
+	if (ctx->timeshift != sbi->sb_timeshift) {
+		pr_err("timeshift can't be changed using remount.\n");
+		goto out_err;
+	}
+
+	unmark_dirty(s);
+
+	sbi->sb_uid = ctx->uid; sbi->sb_gid = ctx->gid;
+	sbi->sb_mode = 0777 & ~ctx->umask;
+	sbi->sb_lowercase = ctx->lowercase;
+	sbi->sb_eas = ctx->eas; sbi->sb_chk = ctx->chk;
+	sbi->sb_chkdsk = ctx->chkdsk;
+	sbi->sb_err = ctx->errs; sbi->sb_timeshift = ctx->timeshift;
+
+	if (!(fc->sb_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,
+	.show_options	= hpfs_show_options,
+};
+
+static int hpfs_fill_super(struct super_block *s, struct fs_context *fc)
+{
+	struct hpfs_fc_context *ctx = fc->fs_private;
+	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;
+	int silent = fc->sb_flags & SB_SILENT;
+
+	dnode_secno root_dno;
+	struct hpfs_dirent *de = NULL;
+	struct quad_buffer_head qbh;
+
+	sbi = kzalloc_obj(*sbi);
+	if (!sbi) {
+		return -ENOMEM;
+	}
+	s->s_fs_info = sbi;
+
+	mutex_init(&sbi->hpfs_mutex);
+	hpfs_lock(s);
+
+	/*sbi->sb_mounting = 1;*/
+	if (!sb_set_blocksize(s, 512))
+		goto bail0;
+	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;
+	set_default_d_op(s, &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 = ctx->uid;
+	sbi->sb_gid = ctx->gid;
+	sbi->sb_mode = 0777 & ~ctx->umask;
+	sbi->sb_n_free = -1;
+	sbi->sb_n_free_dnodes = -1;
+	sbi->sb_lowercase = ctx->lowercase;
+	sbi->sb_eas = ctx->eas;
+	sbi->sb_chk = ctx->chk;
+	sbi->sb_chkdsk = ctx->chkdsk;
+	sbi->sb_err = ctx->errs;
+	sbi->sb_timeshift = ctx->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 (sbi->sb_err == 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 (sbi->sb_err >= 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 (sbi->sb_err == 0)
+			pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
+	}
+	if (sbi->sb_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 {
+		inode_set_atime(root,
+				local_to_gmt(s, le32_to_cpu(de->read_date)),
+				0);
+		inode_set_mtime(root,
+				local_to_gmt(s, le32_to_cpu(de->write_date)),
+				0);
+		inode_set_ctime(root,
+				local_to_gmt(s, le32_to_cpu(de->creation_date)),
+				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 int hpfs_get_tree(struct fs_context *fc)
+{
+	return get_tree_bdev(fc, hpfs_fill_super);
+}
+
+static void hpfs_free_fc(struct fs_context *fc)
+{
+	kfree(fc->fs_private);
+}
+
+static const struct fs_context_operations hpfs_fc_context_ops = {
+	.parse_param	= hpfs_parse_param,
+	.get_tree	= hpfs_get_tree,
+	.reconfigure	= hpfs_reconfigure,
+	.free		= hpfs_free_fc,
+};
+
+static int hpfs_init_fs_context(struct fs_context *fc)
+{
+	struct hpfs_fc_context *ctx;
+
+	ctx = kzalloc_obj(struct hpfs_fc_context);
+	if (!ctx)
+		return -ENOMEM;
+
+	if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
+		struct super_block *sb = fc->root->d_sb;
+		struct hpfs_sb_info *sbi = hpfs_sb(sb);
+
+		ctx->uid = sbi->sb_uid;
+		ctx->gid = sbi->sb_gid;
+		ctx->umask = 0777 & ~sbi->sb_mode;
+		ctx->lowercase = sbi->sb_lowercase;
+		ctx->eas = sbi->sb_eas;
+		ctx->chk = sbi->sb_chk;
+		ctx->chkdsk = sbi->sb_chkdsk;
+		ctx->errs = sbi->sb_err;
+		ctx->timeshift = sbi->sb_timeshift;
+
+	} else {
+		ctx->uid = current_uid();
+		ctx->gid = current_gid();
+		ctx->umask = current_umask();
+		ctx->lowercase = 0;
+		ctx->eas = 2;
+		ctx->chk = 1;
+		ctx->errs = 1;
+		ctx->chkdsk = 1;
+		ctx->timeshift = 0;
+	}
+
+	fc->fs_private = ctx;
+	fc->ops = &hpfs_fc_context_ops;
+
+	return 0;
+};
+
+static struct file_system_type hpfs_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "hpfs",
+	.kill_sb	= kill_block_super,
+	.fs_flags	= FS_REQUIRES_DEV,
+	.init_fs_context = hpfs_init_fs_context,
+	.parameters	= hpfs_param_spec,
+};
+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_DESCRIPTION("OS/2 HPFS file system support");
+MODULE_LICENSE("GPL");
-- 
cgit v1.3.1