Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 1495 insertions, 0 deletions

diff --git a/fs/ufs/super.c b/fs/ufs/super.c
new file mode 100644
index 000000000..6dcf6d048
--- /dev/null
+++ b/fs/ufs/super.c
@@ -0,0 +1,1495 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  linux/fs/ufs/super.c
+ *
+ * Copyright (C) 1998
+ * Daniel Pirkl <daniel.pirkl@email.cz>
+ * Charles University, Faculty of Mathematics and Physics
+ */
+
+/* Derived from
+ *
+ *  linux/fs/ext2/super.c
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ *
+ *  from
+ *
+ *  linux/fs/minix/inode.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  Big-endian to little-endian byte-swapping/bitmaps by
+ *        David S. Miller (davem@caip.rutgers.edu), 1995
+ */
+ 
+/*
+ * Inspired by
+ *
+ *  linux/fs/ufs/super.c
+ *
+ * Copyright (C) 1996
+ * Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
+ * Laboratory for Computer Science Research Computing Facility
+ * Rutgers, The State University of New Jersey
+ *
+ * Copyright (C) 1996  Eddie C. Dost  (ecd@skynet.be)
+ *
+ * Kernel module support added on 96/04/26 by
+ * Stefan Reinauer <stepan@home.culture.mipt.ru>
+ *
+ * Module usage counts added on 96/04/29 by
+ * Gertjan van Wingerde <gwingerde@gmail.com>
+ *
+ * Clean swab support on 19970406 by
+ * Francois-Rene Rideau <fare@tunes.org>
+ *
+ * 4.4BSD (FreeBSD) support added on February 1st 1998 by
+ * Niels Kristian Bech Jensen <nkbj@image.dk> partially based
+ * on code by Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de>.
+ *
+ * NeXTstep support added on February 5th 1998 by
+ * Niels Kristian Bech Jensen <nkbj@image.dk>.
+ *
+ * write support Daniel Pirkl <daniel.pirkl@email.cz> 1998
+ * 
+ * HP/UX hfs filesystem support added by
+ * Martin K. Petersen <mkp@mkp.net>, August 1999
+ *
+ * UFS2 (of FreeBSD 5.x) support added by
+ * Niraj Kumar <niraj17@iitbombay.org>, Jan 2004
+ *
+ * UFS2 write support added by
+ * Evgeniy Dushistov <dushistov@mail.ru>, 2007
+ */
+
+#include <linux/exportfs.h>
+#include <linux/module.h>
+#include <linux/bitops.h>
+
+#include <linux/stdarg.h>
+
+#include <linux/uaccess.h>
+
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
+#include <linux/init.h>
+#include <linux/fs_context.h>
+#include <linux/fs_parser.h>
+#include <linux/buffer_head.h>
+#include <linux/vfs.h>
+#include <linux/log2.h>
+#include <linux/seq_file.h>
+#include <linux/iversion.h>
+
+#include "ufs_fs.h"
+#include "ufs.h"
+#include "swab.h"
+#include "util.h"
+
+static struct inode *ufs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation)
+{
+	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
+	struct inode *inode;
+
+	if (ino < UFS_ROOTINO || ino > (u64)uspi->s_ncg * uspi->s_ipg)
+		return ERR_PTR(-ESTALE);
+
+	inode = ufs_iget(sb, ino);
+	if (IS_ERR(inode))
+		return ERR_CAST(inode);
+	if (generation && inode->i_generation != generation) {
+		iput(inode);
+		return ERR_PTR(-ESTALE);
+	}
+	return inode;
+}
+
+static struct dentry *ufs_fh_to_dentry(struct super_block *sb, struct fid *fid,
+				       int fh_len, int fh_type)
+{
+	return generic_fh_to_dentry(sb, fid, fh_len, fh_type, ufs_nfs_get_inode);
+}
+
+static struct dentry *ufs_fh_to_parent(struct super_block *sb, struct fid *fid,
+				       int fh_len, int fh_type)
+{
+	return generic_fh_to_parent(sb, fid, fh_len, fh_type, ufs_nfs_get_inode);
+}
+
+static struct dentry *ufs_get_parent(struct dentry *child)
+{
+	ino_t ino;
+
+	ino = ufs_inode_by_name(d_inode(child), &dotdot_name);
+	if (!ino)
+		return ERR_PTR(-ENOENT);
+	return d_obtain_alias(ufs_iget(child->d_sb, ino));
+}
+
+static const struct export_operations ufs_export_ops = {
+	.encode_fh = generic_encode_ino32_fh,
+	.fh_to_dentry	= ufs_fh_to_dentry,
+	.fh_to_parent	= ufs_fh_to_parent,
+	.get_parent	= ufs_get_parent,
+};
+
+#ifdef CONFIG_UFS_DEBUG
+/*
+ * Print contents of ufs_super_block, useful for debugging
+ */
+static void ufs_print_super_stuff(struct super_block *sb,
+				  struct ufs_super_block_first *usb1,
+				  struct ufs_super_block_second *usb2,
+				  struct ufs_super_block_third *usb3)
+{
+	u32 magic = fs32_to_cpu(sb, usb3->fs_magic);
+
+	pr_debug("ufs_print_super_stuff\n");
+	pr_debug("  magic:     0x%x\n", magic);
+	if (fs32_to_cpu(sb, usb3->fs_magic) == UFS2_MAGIC) {
+		pr_debug("  fs_size:   %llu\n", (unsigned long long)
+			 fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_size));
+		pr_debug("  fs_dsize:  %llu\n", (unsigned long long)
+			 fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_dsize));
+		pr_debug("  bsize:         %u\n",
+			 fs32_to_cpu(sb, usb1->fs_bsize));
+		pr_debug("  fsize:         %u\n",
+			 fs32_to_cpu(sb, usb1->fs_fsize));
+		pr_debug("  fs_volname:  %s\n", usb2->fs_un.fs_u2.fs_volname);
+		pr_debug("  fs_sblockloc: %llu\n", (unsigned long long)
+			 fs64_to_cpu(sb, usb2->fs_un.fs_u2.fs_sblockloc));
+		pr_debug("  cs_ndir(No of dirs):  %llu\n", (unsigned long long)
+			 fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_ndir));
+		pr_debug("  cs_nbfree(No of free blocks):  %llu\n",
+			 (unsigned long long)
+			 fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_nbfree));
+		pr_info("  cs_nifree(Num of free inodes): %llu\n",
+			(unsigned long long)
+			fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nifree));
+		pr_info("  cs_nffree(Num of free frags): %llu\n",
+			(unsigned long long)
+			fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nffree));
+		pr_info("  fs_maxsymlinklen: %u\n",
+			fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_maxsymlinklen));
+	} else {
+		pr_debug(" sblkno:      %u\n", fs32_to_cpu(sb, usb1->fs_sblkno));
+		pr_debug(" cblkno:      %u\n", fs32_to_cpu(sb, usb1->fs_cblkno));
+		pr_debug(" iblkno:      %u\n", fs32_to_cpu(sb, usb1->fs_iblkno));
+		pr_debug(" dblkno:      %u\n", fs32_to_cpu(sb, usb1->fs_dblkno));
+		pr_debug(" cgoffset:    %u\n",
+			 fs32_to_cpu(sb, usb1->fs_cgoffset));
+		pr_debug(" ~cgmask:     0x%x\n",
+			 ~fs32_to_cpu(sb, usb1->fs_cgmask));
+		pr_debug(" size:        %u\n", fs32_to_cpu(sb, usb1->fs_size));
+		pr_debug(" dsize:       %u\n", fs32_to_cpu(sb, usb1->fs_dsize));
+		pr_debug(" ncg:         %u\n", fs32_to_cpu(sb, usb1->fs_ncg));
+		pr_debug(" bsize:       %u\n", fs32_to_cpu(sb, usb1->fs_bsize));
+		pr_debug(" fsize:       %u\n", fs32_to_cpu(sb, usb1->fs_fsize));
+		pr_debug(" frag:        %u\n", fs32_to_cpu(sb, usb1->fs_frag));
+		pr_debug(" fragshift:   %u\n",
+			 fs32_to_cpu(sb, usb1->fs_fragshift));
+		pr_debug(" ~fmask:      %u\n", ~fs32_to_cpu(sb, usb1->fs_fmask));
+		pr_debug(" fshift:      %u\n", fs32_to_cpu(sb, usb1->fs_fshift));
+		pr_debug(" sbsize:      %u\n", fs32_to_cpu(sb, usb1->fs_sbsize));
+		pr_debug(" spc:         %u\n", fs32_to_cpu(sb, usb1->fs_spc));
+		pr_debug(" cpg:         %u\n", fs32_to_cpu(sb, usb1->fs_cpg));
+		pr_debug(" ipg:         %u\n", fs32_to_cpu(sb, usb1->fs_ipg));
+		pr_debug(" fpg:         %u\n", fs32_to_cpu(sb, usb1->fs_fpg));
+		pr_debug(" csaddr:      %u\n", fs32_to_cpu(sb, usb1->fs_csaddr));
+		pr_debug(" cssize:      %u\n", fs32_to_cpu(sb, usb1->fs_cssize));
+		pr_debug(" cgsize:      %u\n", fs32_to_cpu(sb, usb1->fs_cgsize));
+		pr_debug(" fstodb:      %u\n",
+			 fs32_to_cpu(sb, usb1->fs_fsbtodb));
+		pr_debug(" nrpos:       %u\n", fs32_to_cpu(sb, usb3->fs_nrpos));
+		pr_debug(" ndir         %u\n",
+			 fs32_to_cpu(sb, usb1->fs_cstotal.cs_ndir));
+		pr_debug(" nifree       %u\n",
+			 fs32_to_cpu(sb, usb1->fs_cstotal.cs_nifree));
+		pr_debug(" nbfree       %u\n",
+			 fs32_to_cpu(sb, usb1->fs_cstotal.cs_nbfree));
+		pr_debug(" nffree       %u\n",
+			 fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree));
+	}
+	pr_debug("\n");
+}
+
+/*
+ * Print contents of ufs_cylinder_group, useful for debugging
+ */
+static void ufs_print_cylinder_stuff(struct super_block *sb,
+				     struct ufs_cylinder_group *cg)
+{
+	pr_debug("\nufs_print_cylinder_stuff\n");
+	pr_debug("size of ucg: %zu\n", sizeof(struct ufs_cylinder_group));
+	pr_debug("  magic:        %x\n", fs32_to_cpu(sb, cg->cg_magic));
+	pr_debug("  time:         %u\n", fs32_to_cpu(sb, cg->cg_time));
+	pr_debug("  cgx:          %u\n", fs32_to_cpu(sb, cg->cg_cgx));
+	pr_debug("  ncyl:         %u\n", fs16_to_cpu(sb, cg->cg_ncyl));
+	pr_debug("  niblk:        %u\n", fs16_to_cpu(sb, cg->cg_niblk));
+	pr_debug("  ndblk:        %u\n", fs32_to_cpu(sb, cg->cg_ndblk));
+	pr_debug("  cs_ndir:      %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_ndir));
+	pr_debug("  cs_nbfree:    %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_nbfree));
+	pr_debug("  cs_nifree:    %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_nifree));
+	pr_debug("  cs_nffree:    %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_nffree));
+	pr_debug("  rotor:        %u\n", fs32_to_cpu(sb, cg->cg_rotor));
+	pr_debug("  frotor:       %u\n", fs32_to_cpu(sb, cg->cg_frotor));
+	pr_debug("  irotor:       %u\n", fs32_to_cpu(sb, cg->cg_irotor));
+	pr_debug("  frsum:        %u, %u, %u, %u, %u, %u, %u, %u\n",
+	    fs32_to_cpu(sb, cg->cg_frsum[0]), fs32_to_cpu(sb, cg->cg_frsum[1]),
+	    fs32_to_cpu(sb, cg->cg_frsum[2]), fs32_to_cpu(sb, cg->cg_frsum[3]),
+	    fs32_to_cpu(sb, cg->cg_frsum[4]), fs32_to_cpu(sb, cg->cg_frsum[5]),
+	    fs32_to_cpu(sb, cg->cg_frsum[6]), fs32_to_cpu(sb, cg->cg_frsum[7]));
+	pr_debug("  btotoff:      %u\n", fs32_to_cpu(sb, cg->cg_btotoff));
+	pr_debug("  boff:         %u\n", fs32_to_cpu(sb, cg->cg_boff));
+	pr_debug("  iuseoff:      %u\n", fs32_to_cpu(sb, cg->cg_iusedoff));
+	pr_debug("  freeoff:      %u\n", fs32_to_cpu(sb, cg->cg_freeoff));
+	pr_debug("  nextfreeoff:  %u\n", fs32_to_cpu(sb, cg->cg_nextfreeoff));
+	pr_debug("  clustersumoff %u\n",
+		 fs32_to_cpu(sb, cg->cg_u.cg_44.cg_clustersumoff));
+	pr_debug("  clusteroff    %u\n",
+		 fs32_to_cpu(sb, cg->cg_u.cg_44.cg_clusteroff));
+	pr_debug("  nclusterblks  %u\n",
+		 fs32_to_cpu(sb, cg->cg_u.cg_44.cg_nclusterblks));
+	pr_debug("\n");
+}
+#else
+#  define ufs_print_super_stuff(sb, usb1, usb2, usb3) /**/
+#  define ufs_print_cylinder_stuff(sb, cg) /**/
+#endif /* CONFIG_UFS_DEBUG */
+
+static const struct super_operations ufs_super_ops;
+
+void ufs_error (struct super_block * sb, const char * function,
+	const char * fmt, ...)
+{
+	struct ufs_sb_private_info * uspi;
+	struct ufs_super_block_first * usb1;
+	struct va_format vaf;
+	va_list args;
+
+	uspi = UFS_SB(sb)->s_uspi;
+	usb1 = ubh_get_usb_first(uspi);
+	
+	if (!sb_rdonly(sb)) {
+		usb1->fs_clean = UFS_FSBAD;
+		ubh_mark_buffer_dirty(USPI_UBH(uspi));
+		ufs_mark_sb_dirty(sb);
+		sb->s_flags |= SB_RDONLY;
+	}
+	va_start(args, fmt);
+	vaf.fmt = fmt;
+	vaf.va = &args;
+	switch (UFS_SB(sb)->s_on_err) {
+	case UFS_MOUNT_ONERROR_PANIC:
+		panic("panic (device %s): %s: %pV\n",
+		      sb->s_id, function, &vaf);
+
+	case UFS_MOUNT_ONERROR_LOCK:
+	case UFS_MOUNT_ONERROR_UMOUNT:
+	case UFS_MOUNT_ONERROR_REPAIR:
+		pr_crit("error (device %s): %s: %pV\n",
+			sb->s_id, function, &vaf);
+	}
+	va_end(args);
+}
+
+void ufs_panic (struct super_block * sb, const char * function,
+	const char * fmt, ...)
+{
+	struct ufs_sb_private_info * uspi;
+	struct ufs_super_block_first * usb1;
+	struct va_format vaf;
+	va_list args;
+	
+	uspi = UFS_SB(sb)->s_uspi;
+	usb1 = ubh_get_usb_first(uspi);
+	
+	if (!sb_rdonly(sb)) {
+		usb1->fs_clean = UFS_FSBAD;
+		ubh_mark_buffer_dirty(USPI_UBH(uspi));
+		ufs_mark_sb_dirty(sb);
+	}
+	va_start(args, fmt);
+	vaf.fmt = fmt;
+	vaf.va = &args;
+	sb->s_flags |= SB_RDONLY;
+	pr_crit("panic (device %s): %s: %pV\n",
+		sb->s_id, function, &vaf);
+	va_end(args);
+}
+
+void ufs_warning (struct super_block * sb, const char * function,
+	const char * fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+
+	va_start(args, fmt);
+	vaf.fmt = fmt;
+	vaf.va = &args;
+	pr_warn("(device %s): %s: %pV\n",
+		sb->s_id, function, &vaf);
+	va_end(args);
+}
+
+enum { Opt_type, Opt_onerror };
+
+static const struct constant_table ufs_param_ufstype[] = {
+	{"old",		UFS_MOUNT_UFSTYPE_OLD},
+	{"sunx86",	UFS_MOUNT_UFSTYPE_SUNx86},
+	{"sun",		UFS_MOUNT_UFSTYPE_SUN},
+	{"sunos",	UFS_MOUNT_UFSTYPE_SUNOS},
+	{"44bsd",	UFS_MOUNT_UFSTYPE_44BSD},
+	{"ufs2",	UFS_MOUNT_UFSTYPE_UFS2},
+	{"5xbsd",	UFS_MOUNT_UFSTYPE_UFS2},
+	{"hp",		UFS_MOUNT_UFSTYPE_HP},
+	{"nextstep-cd",	UFS_MOUNT_UFSTYPE_NEXTSTEP_CD},
+	{"nextstep",	UFS_MOUNT_UFSTYPE_NEXTSTEP},
+	{"openstep",	UFS_MOUNT_UFSTYPE_OPENSTEP},
+	{}
+};
+
+static const struct constant_table ufs_param_onerror[] = {
+	{"panic",	UFS_MOUNT_ONERROR_PANIC},
+	{"lock",	UFS_MOUNT_ONERROR_LOCK},
+	{"umount",	UFS_MOUNT_ONERROR_UMOUNT},
+	{"repair",	UFS_MOUNT_ONERROR_REPAIR},
+	{}
+};
+
+static const struct fs_parameter_spec ufs_param_spec[] = {
+	fsparam_enum	("ufstype",	Opt_type, ufs_param_ufstype),
+	fsparam_enum	("onerror",	Opt_onerror, ufs_param_onerror),
+	{}
+};
+
+struct ufs_fs_context {
+	unsigned int flavour, on_err;
+};
+
+static int ufs_parse_param(struct fs_context *fc, struct fs_parameter *param)
+{
+	struct ufs_fs_context *ctx = fc->fs_private;
+	struct fs_parse_result result;
+	int opt;
+
+	UFSD("ENTER\n");
+
+	opt = fs_parse(fc, ufs_param_spec, param, &result);
+	if (opt < 0)
+		return opt;
+
+	switch (opt) {
+	case Opt_type:
+		if (ctx->flavour == result.uint_32) /* no-op */
+			return 0;
+		if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
+			pr_err("ufstype can't be changed during remount\n");
+			return -EINVAL;
+		}
+                if (ctx->flavour) {
+			pr_err("conflicting ufstype options\n");
+			return -EINVAL;
+		}
+		ctx->flavour = result.uint_32;
+		break;
+	case Opt_onerror:
+		ctx->on_err = result.uint_32;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/*
+ * Different types of UFS hold fs_cstotal in different
+ * places, and use different data structure for it.
+ * To make things simpler we just copy fs_cstotal to ufs_sb_private_info
+ */
+static void ufs_setup_cstotal(struct super_block *sb)
+{
+	struct ufs_sb_info *sbi = UFS_SB(sb);
+	struct ufs_sb_private_info *uspi = sbi->s_uspi;
+	struct ufs_super_block_first *usb1;
+	struct ufs_super_block_second *usb2;
+	struct ufs_super_block_third *usb3;
+	unsigned mtype = sbi->s_flavour;
+
+	UFSD("ENTER, mtype=%u\n", mtype);
+	usb1 = ubh_get_usb_first(uspi);
+	usb2 = ubh_get_usb_second(uspi);
+	usb3 = ubh_get_usb_third(uspi);
+
+	if ((mtype == UFS_MOUNT_UFSTYPE_44BSD &&
+	     (usb2->fs_un.fs_u2.fs_maxbsize == usb1->fs_bsize)) ||
+	    mtype == UFS_MOUNT_UFSTYPE_UFS2) {
+		/*we have statistic in different place, then usual*/
+		uspi->cs_total.cs_ndir = fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_ndir);
+		uspi->cs_total.cs_nbfree = fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_nbfree);
+		uspi->cs_total.cs_nifree = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nifree);
+		uspi->cs_total.cs_nffree = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nffree);
+	} else {
+		uspi->cs_total.cs_ndir = fs32_to_cpu(sb, usb1->fs_cstotal.cs_ndir);
+		uspi->cs_total.cs_nbfree = fs32_to_cpu(sb, usb1->fs_cstotal.cs_nbfree);
+		uspi->cs_total.cs_nifree = fs32_to_cpu(sb, usb1->fs_cstotal.cs_nifree);
+		uspi->cs_total.cs_nffree = fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree);
+	}
+	UFSD("EXIT\n");
+}
+
+/*
+ * Read on-disk structures associated with cylinder groups
+ */
+static int ufs_read_cylinder_structures(struct super_block *sb)
+{
+	struct ufs_sb_info *sbi = UFS_SB(sb);
+	struct ufs_sb_private_info *uspi = sbi->s_uspi;
+	unsigned char * base, * space;
+	unsigned size, blks, i;
+
+	UFSD("ENTER\n");
+
+	/*
+	 * Read cs structures from (usually) first data block
+	 * on the device. 
+	 */
+	size = uspi->s_cssize;
+	blks = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
+	base = space = kmalloc(size, GFP_NOFS);
+	if (!base)
+		goto failed; 
+	sbi->s_csp = (struct ufs_csum *)space;
+	for (i = 0; i < blks; i++) {
+		struct buffer_head *bh = sb_bread(sb, uspi->s_csaddr + i);
+		if (!bh)
+			goto failed;
+		memcpy(space, bh->b_data, uspi->s_fsize);
+		space += uspi->s_fsize;
+		brelse (bh);
+	}
+
+	/*
+	 * Read cylinder group (we read only first fragment from block
+	 * at this time) and prepare internal data structures for cg caching.
+	 */
+	sbi->s_ucg = kmalloc_objs(struct buffer_head *, uspi->s_ncg, GFP_NOFS);
+	if (!sbi->s_ucg)
+		goto failed;
+	for (i = 0; i < uspi->s_ncg; i++) 
+		sbi->s_ucg[i] = NULL;
+	for (i = 0; i < UFS_MAX_GROUP_LOADED; i++) {
+		sbi->s_ucpi[i] = NULL;
+		sbi->s_cgno[i] = UFS_CGNO_EMPTY;
+	}
+	for (i = 0; i < uspi->s_ncg; i++) {
+		UFSD("read cg %u\n", i);
+		if (!(sbi->s_ucg[i] = sb_bread(sb, ufs_cgcmin(i))))
+			goto failed;
+		if (!ufs_cg_chkmagic (sb, (struct ufs_cylinder_group *) sbi->s_ucg[i]->b_data))
+			goto failed;
+
+		ufs_print_cylinder_stuff(sb, (struct ufs_cylinder_group *) sbi->s_ucg[i]->b_data);
+	}
+	for (i = 0; i < UFS_MAX_GROUP_LOADED; i++) {
+		if (!(sbi->s_ucpi[i] = kmalloc_obj(struct ufs_cg_private_info, GFP_NOFS)))
+			goto failed;
+		sbi->s_cgno[i] = UFS_CGNO_EMPTY;
+	}
+	sbi->s_cg_loaded = 0;
+	UFSD("EXIT\n");
+	return 1;
+
+failed:
+	kfree (base);
+	if (sbi->s_ucg) {
+		for (i = 0; i < uspi->s_ncg; i++)
+			if (sbi->s_ucg[i])
+				brelse (sbi->s_ucg[i]);
+		kfree (sbi->s_ucg);
+		for (i = 0; i < UFS_MAX_GROUP_LOADED; i++)
+			kfree (sbi->s_ucpi[i]);
+	}
+	UFSD("EXIT (FAILED)\n");
+	return 0;
+}
+
+/*
+ * Sync our internal copy of fs_cstotal with disk
+ */
+static void ufs_put_cstotal(struct super_block *sb)
+{
+	unsigned mtype = UFS_SB(sb)->s_flavour;
+	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
+	struct ufs_super_block_first *usb1;
+	struct ufs_super_block_second *usb2;
+	struct ufs_super_block_third *usb3;
+
+	UFSD("ENTER\n");
+	usb1 = ubh_get_usb_first(uspi);
+	usb2 = ubh_get_usb_second(uspi);
+	usb3 = ubh_get_usb_third(uspi);
+
+	if (mtype == UFS_MOUNT_UFSTYPE_UFS2) {
+		/*we have statistic in different place, then usual*/
+		usb2->fs_un.fs_u2.cs_ndir =
+			cpu_to_fs64(sb, uspi->cs_total.cs_ndir);
+		usb2->fs_un.fs_u2.cs_nbfree =
+			cpu_to_fs64(sb, uspi->cs_total.cs_nbfree);
+		usb3->fs_un1.fs_u2.cs_nifree =
+			cpu_to_fs64(sb, uspi->cs_total.cs_nifree);
+		usb3->fs_un1.fs_u2.cs_nffree =
+			cpu_to_fs64(sb, uspi->cs_total.cs_nffree);
+		goto out;
+	}
+
+	if (mtype == UFS_MOUNT_UFSTYPE_44BSD &&
+	     (usb2->fs_un.fs_u2.fs_maxbsize == usb1->fs_bsize)) {
+		/* store stats in both old and new places */
+		usb2->fs_un.fs_u2.cs_ndir =
+			cpu_to_fs64(sb, uspi->cs_total.cs_ndir);
+		usb2->fs_un.fs_u2.cs_nbfree =
+			cpu_to_fs64(sb, uspi->cs_total.cs_nbfree);
+		usb3->fs_un1.fs_u2.cs_nifree =
+			cpu_to_fs64(sb, uspi->cs_total.cs_nifree);
+		usb3->fs_un1.fs_u2.cs_nffree =
+			cpu_to_fs64(sb, uspi->cs_total.cs_nffree);
+	}
+	usb1->fs_cstotal.cs_ndir = cpu_to_fs32(sb, uspi->cs_total.cs_ndir);
+	usb1->fs_cstotal.cs_nbfree = cpu_to_fs32(sb, uspi->cs_total.cs_nbfree);
+	usb1->fs_cstotal.cs_nifree = cpu_to_fs32(sb, uspi->cs_total.cs_nifree);
+	usb1->fs_cstotal.cs_nffree = cpu_to_fs32(sb, uspi->cs_total.cs_nffree);
+out:
+	ubh_mark_buffer_dirty(USPI_UBH(uspi));
+	ufs_print_super_stuff(sb, usb1, usb2, usb3);
+	UFSD("EXIT\n");
+}
+
+/**
+ * ufs_put_super_internal() - put on-disk intrenal structures
+ * @sb: pointer to super_block structure
+ * Put on-disk structures associated with cylinder groups
+ * and write them back to disk, also update cs_total on disk
+ */
+static void ufs_put_super_internal(struct super_block *sb)
+{
+	struct ufs_sb_info *sbi = UFS_SB(sb);
+	struct ufs_sb_private_info *uspi = sbi->s_uspi;
+	unsigned char * base, * space;
+	unsigned blks, size, i;
+
+	
+	UFSD("ENTER\n");
+
+	ufs_put_cstotal(sb);
+	size = uspi->s_cssize;
+	blks = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
+	base = space = (char*) sbi->s_csp;
+	for (i = 0; i < blks; i++, space += uspi->s_fsize) {
+		struct buffer_head *bh = sb_bread(sb, uspi->s_csaddr + i);
+
+		if (unlikely(!bh)) { // better than an oops...
+			ufs_panic(sb, __func__,
+				"can't write part of cylinder group summary");
+			continue;
+		}
+		memcpy(bh->b_data, space, uspi->s_fsize);
+		mark_buffer_dirty(bh);
+		brelse(bh);
+	}
+	for (i = 0; i < sbi->s_cg_loaded; i++) {
+		ufs_put_cylinder (sb, i);
+		kfree (sbi->s_ucpi[i]);
+	}
+	for (; i < UFS_MAX_GROUP_LOADED; i++) 
+		kfree (sbi->s_ucpi[i]);
+	for (i = 0; i < uspi->s_ncg; i++) 
+		brelse (sbi->s_ucg[i]);
+	kfree (sbi->s_ucg);
+	kfree (base);
+
+	UFSD("EXIT\n");
+}
+
+static int ufs_sync_fs(struct super_block *sb, int wait)
+{
+	struct ufs_sb_private_info * uspi;
+	struct ufs_super_block_first * usb1;
+	struct ufs_super_block_third * usb3;
+	unsigned flags;
+
+	mutex_lock(&UFS_SB(sb)->s_lock);
+
+	UFSD("ENTER\n");
+
+	flags = UFS_SB(sb)->s_flags;
+	uspi = UFS_SB(sb)->s_uspi;
+	usb1 = ubh_get_usb_first(uspi);
+	usb3 = ubh_get_usb_third(uspi);
+
+	usb1->fs_time = ufs_get_seconds(sb);
+	if ((flags & UFS_ST_MASK) == UFS_ST_SUN  ||
+	    (flags & UFS_ST_MASK) == UFS_ST_SUNOS ||
+	    (flags & UFS_ST_MASK) == UFS_ST_SUNx86)
+		ufs_set_fs_state(sb, usb1, usb3,
+				UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time));
+	ufs_put_cstotal(sb);
+
+	UFSD("EXIT\n");
+	mutex_unlock(&UFS_SB(sb)->s_lock);
+
+	return 0;
+}
+
+static void delayed_sync_fs(struct work_struct *work)
+{
+	struct ufs_sb_info *sbi;
+
+	sbi = container_of(work, struct ufs_sb_info, sync_work.work);
+
+	spin_lock(&sbi->work_lock);
+	sbi->work_queued = 0;
+	spin_unlock(&sbi->work_lock);
+
+	ufs_sync_fs(sbi->sb, 1);
+}
+
+void ufs_mark_sb_dirty(struct super_block *sb)
+{
+	struct ufs_sb_info *sbi = UFS_SB(sb);
+	unsigned long delay;
+
+	spin_lock(&sbi->work_lock);
+	if (!sbi->work_queued) {
+		delay = msecs_to_jiffies(dirty_writeback_interval * 10);
+		queue_delayed_work(system_dfl_long_wq, &sbi->sync_work, delay);
+		sbi->work_queued = 1;
+	}
+	spin_unlock(&sbi->work_lock);
+}
+
+static void ufs_put_super(struct super_block *sb)
+{
+	struct ufs_sb_info * sbi = UFS_SB(sb);
+
+	UFSD("ENTER\n");
+
+	if (!sb_rdonly(sb))
+		ufs_put_super_internal(sb);
+	cancel_delayed_work_sync(&sbi->sync_work);
+
+	ubh_brelse_uspi (sbi->s_uspi);
+	kfree (sbi->s_uspi);
+	kfree (sbi);
+	sb->s_fs_info = NULL;
+	UFSD("EXIT\n");
+	return;
+}
+
+static u64 ufs_max_bytes(struct super_block *sb)
+{
+	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
+	int bits = uspi->s_apbshift;
+	u64 res;
+
+	if (bits > 21)
+		res = ~0ULL;
+	else
+		res = UFS_NDADDR + (1LL << bits) + (1LL << (2*bits)) +
+			(1LL << (3*bits));
+
+	if (res >= (MAX_LFS_FILESIZE >> uspi->s_bshift))
+		return MAX_LFS_FILESIZE;
+	return res << uspi->s_bshift;
+}
+
+static int ufs_fill_super(struct super_block *sb, struct fs_context *fc)
+{
+	struct ufs_fs_context *ctx = fc->fs_private;
+	int silent = fc->sb_flags & SB_SILENT;
+	struct ufs_sb_info * sbi;
+	struct ufs_sb_private_info * uspi;
+	struct ufs_super_block_first * usb1;
+	struct ufs_super_block_second * usb2;
+	struct ufs_super_block_third * usb3;
+	struct ufs_buffer_head * ubh;	
+	struct inode *inode;
+	unsigned block_size, super_block_size;
+	unsigned flags;
+	unsigned super_block_offset;
+	unsigned maxsymlen;
+	int ret = -EINVAL;
+
+	uspi = NULL;
+	ubh = NULL;
+	flags = 0;
+	
+	UFSD("ENTER\n");
+
+#ifndef CONFIG_UFS_FS_WRITE
+	if (!sb_rdonly(sb)) {
+		pr_err("ufs was compiled with read-only support, can't be mounted as read-write\n");
+		return -EROFS;
+	}
+#endif
+		
+	sbi = kzalloc_obj(struct ufs_sb_info);
+	if (!sbi)
+		goto failed_nomem;
+	sb->s_fs_info = sbi;
+	sbi->sb = sb;
+
+	UFSD("flag %u\n", (int)(sb_rdonly(sb)));
+	
+	mutex_init(&sbi->s_lock);
+	spin_lock_init(&sbi->work_lock);
+	INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
+
+	sbi->s_flavour = ctx->flavour;
+	sbi->s_on_err = ctx->on_err;
+
+	if (!sbi->s_flavour) {
+		if (!silent)
+			pr_err("You didn't specify the type of your ufs filesystem\n\n"
+			"mount -t ufs -o ufstype="
+			"sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...\n\n"
+			">>>WARNING<<< Wrong ufstype may corrupt your filesystem, "
+			"default is ufstype=old\n");
+		sbi->s_flavour = UFS_MOUNT_UFSTYPE_OLD;
+	}
+
+	uspi = kzalloc_obj(struct ufs_sb_private_info);
+	sbi->s_uspi = uspi;
+	if (!uspi)
+		goto failed;
+	uspi->s_dirblksize = UFS_SECTOR_SIZE;
+	super_block_offset=UFS_SBLOCK;
+
+	sb->s_maxbytes = MAX_LFS_FILESIZE;
+
+	sb->s_time_gran = NSEC_PER_SEC;
+	sb->s_time_min = S32_MIN;
+	sb->s_time_max = S32_MAX;
+
+	switch (sbi->s_flavour) {
+	case UFS_MOUNT_UFSTYPE_44BSD:
+		UFSD("ufstype=44bsd\n");
+		uspi->s_fsize = block_size = 512;
+		uspi->s_fmask = ~(512 - 1);
+		uspi->s_fshift = 9;
+		uspi->s_sbsize = super_block_size = 1536;
+		uspi->s_sbbase = 0;
+		flags |= UFS_DE_44BSD | UFS_UID_44BSD | UFS_ST_44BSD | UFS_CG_44BSD;
+		break;
+	case UFS_MOUNT_UFSTYPE_UFS2:
+		UFSD("ufstype=ufs2\n");
+		super_block_offset=SBLOCK_UFS2;
+		uspi->s_fsize = block_size = 512;
+		uspi->s_fmask = ~(512 - 1);
+		uspi->s_fshift = 9;
+		uspi->s_sbsize = super_block_size = 1536;
+		uspi->s_sbbase =  0;
+		sb->s_time_gran = 1;
+		sb->s_time_min = S64_MIN;
+		sb->s_time_max = S64_MAX;
+		flags |= UFS_TYPE_UFS2 | UFS_DE_44BSD | UFS_UID_44BSD | UFS_ST_44BSD | UFS_CG_44BSD;
+		break;
+		
+	case UFS_MOUNT_UFSTYPE_SUN:
+		UFSD("ufstype=sun\n");
+		uspi->s_fsize = block_size = 1024;
+		uspi->s_fmask = ~(1024 - 1);
+		uspi->s_fshift = 10;
+		uspi->s_sbsize = super_block_size = 2048;
+		uspi->s_sbbase = 0;
+		uspi->s_maxsymlinklen = 0; /* Not supported on disk */
+		flags |= UFS_DE_OLD | UFS_UID_EFT | UFS_ST_SUN | UFS_CG_SUN;
+		break;
+
+	case UFS_MOUNT_UFSTYPE_SUNOS:
+		UFSD("ufstype=sunos\n");
+		uspi->s_fsize = block_size = 1024;
+		uspi->s_fmask = ~(1024 - 1);
+		uspi->s_fshift = 10;
+		uspi->s_sbsize = 2048;
+		super_block_size = 2048;
+		uspi->s_sbbase = 0;
+		uspi->s_maxsymlinklen = 0; /* Not supported on disk */
+		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_SUNOS | UFS_CG_SUN;
+		break;
+
+	case UFS_MOUNT_UFSTYPE_SUNx86:
+		UFSD("ufstype=sunx86\n");
+		uspi->s_fsize = block_size = 1024;
+		uspi->s_fmask = ~(1024 - 1);
+		uspi->s_fshift = 10;
+		uspi->s_sbsize = super_block_size = 2048;
+		uspi->s_sbbase = 0;
+		uspi->s_maxsymlinklen = 0; /* Not supported on disk */
+		flags |= UFS_DE_OLD | UFS_UID_EFT | UFS_ST_SUNx86 | UFS_CG_SUN;
+		break;
+
+	case UFS_MOUNT_UFSTYPE_OLD:
+		UFSD("ufstype=old\n");
+		uspi->s_fsize = block_size = 1024;
+		uspi->s_fmask = ~(1024 - 1);
+		uspi->s_fshift = 10;
+		uspi->s_sbsize = super_block_size = 2048;
+		uspi->s_sbbase = 0;
+		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_OLD | UFS_CG_OLD;
+		if (!sb_rdonly(sb)) {
+			if (!silent)
+				pr_info("ufstype=old is supported read-only\n");
+			sb->s_flags |= SB_RDONLY;
+		}
+		break;
+	
+	case UFS_MOUNT_UFSTYPE_NEXTSTEP:
+		UFSD("ufstype=nextstep\n");
+		uspi->s_fsize = block_size = 1024;
+		uspi->s_fmask = ~(1024 - 1);
+		uspi->s_fshift = 10;
+		uspi->s_sbsize = super_block_size = 2048;
+		uspi->s_sbbase = 0;
+		uspi->s_dirblksize = 1024;
+		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_OLD | UFS_CG_OLD;
+		if (!sb_rdonly(sb)) {
+			if (!silent)
+				pr_info("ufstype=nextstep is supported read-only\n");
+			sb->s_flags |= SB_RDONLY;
+		}
+		break;
+	
+	case UFS_MOUNT_UFSTYPE_NEXTSTEP_CD:
+		UFSD("ufstype=nextstep-cd\n");
+		uspi->s_fsize = block_size = 2048;
+		uspi->s_fmask = ~(2048 - 1);
+		uspi->s_fshift = 11;
+		uspi->s_sbsize = super_block_size = 2048;
+		uspi->s_sbbase = 0;
+		uspi->s_dirblksize = 1024;
+		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_OLD | UFS_CG_OLD;
+		if (!sb_rdonly(sb)) {
+			if (!silent)
+				pr_info("ufstype=nextstep-cd is supported read-only\n");
+			sb->s_flags |= SB_RDONLY;
+		}
+		break;
+	
+	case UFS_MOUNT_UFSTYPE_OPENSTEP:
+		UFSD("ufstype=openstep\n");
+		uspi->s_fsize = block_size = 1024;
+		uspi->s_fmask = ~(1024 - 1);
+		uspi->s_fshift = 10;
+		uspi->s_sbsize = super_block_size = 2048;
+		uspi->s_sbbase = 0;
+		uspi->s_dirblksize = 1024;
+		flags |= UFS_DE_44BSD | UFS_UID_44BSD | UFS_ST_44BSD | UFS_CG_44BSD;
+		if (!sb_rdonly(sb)) {
+			if (!silent)
+				pr_info("ufstype=openstep is supported read-only\n");
+			sb->s_flags |= SB_RDONLY;
+		}
+		break;
+	
+	case UFS_MOUNT_UFSTYPE_HP:
+		UFSD("ufstype=hp\n");
+		uspi->s_fsize = block_size = 1024;
+		uspi->s_fmask = ~(1024 - 1);
+		uspi->s_fshift = 10;
+		uspi->s_sbsize = super_block_size = 2048;
+		uspi->s_sbbase = 0;
+		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_OLD | UFS_CG_OLD;
+		if (!sb_rdonly(sb)) {
+			if (!silent)
+				pr_info("ufstype=hp is supported read-only\n");
+			sb->s_flags |= SB_RDONLY;
+ 		}
+ 		break;
+	default:
+		if (!silent)
+			pr_err("unknown ufstype\n");
+		goto failed;
+	}
+	
+again:	
+	if (!sb_set_blocksize(sb, block_size)) {
+		pr_err("failed to set blocksize\n");
+		goto failed;
+	}
+
+	/*
+	 * read ufs super block from device
+	 */
+
+	ubh = ubh_bread_uspi(uspi, sb, uspi->s_sbbase + super_block_offset/block_size, super_block_size);
+	
+	if (!ubh) 
+            goto failed;
+
+	usb1 = ubh_get_usb_first(uspi);
+	usb2 = ubh_get_usb_second(uspi);
+	usb3 = ubh_get_usb_third(uspi);
+
+	/* Sort out mod used on SunOS 4.1.3 for fs_state */
+	uspi->s_postblformat = fs32_to_cpu(sb, usb3->fs_postblformat);
+	if (((flags & UFS_ST_MASK) == UFS_ST_SUNOS) &&
+	    (uspi->s_postblformat != UFS_42POSTBLFMT)) {
+		flags &= ~UFS_ST_MASK;
+		flags |=  UFS_ST_SUN;
+	}
+
+	if ((flags & UFS_ST_MASK) == UFS_ST_44BSD &&
+	    uspi->s_postblformat == UFS_42POSTBLFMT) {
+		if (!silent)
+			pr_err("this is not a 44bsd filesystem");
+		goto failed;
+	}
+
+	/*
+	 * Check ufs magic number
+	 */
+	sbi->s_bytesex = BYTESEX_LE;
+	switch ((uspi->fs_magic = fs32_to_cpu(sb, usb3->fs_magic))) {
+		case UFS_MAGIC:
+		case UFS_MAGIC_BW:
+		case UFS2_MAGIC:
+		case UFS_MAGIC_LFN:
+	        case UFS_MAGIC_FEA:
+	        case UFS_MAGIC_4GB:
+			goto magic_found;
+	}
+	sbi->s_bytesex = BYTESEX_BE;
+	switch ((uspi->fs_magic = fs32_to_cpu(sb, usb3->fs_magic))) {
+		case UFS_MAGIC:
+		case UFS_MAGIC_BW:
+		case UFS2_MAGIC:
+		case UFS_MAGIC_LFN:
+	        case UFS_MAGIC_FEA:
+	        case UFS_MAGIC_4GB:
+			goto magic_found;
+	}
+
+	if ((sbi->s_flavour == UFS_MOUNT_UFSTYPE_NEXTSTEP
+	  || sbi->s_flavour == UFS_MOUNT_UFSTYPE_NEXTSTEP_CD
+	  || sbi->s_flavour == UFS_MOUNT_UFSTYPE_OPENSTEP)
+	  && uspi->s_sbbase < 256) {
+		ubh_brelse_uspi(uspi);
+		ubh = NULL;
+		uspi->s_sbbase += 8;
+		goto again;
+	}
+	if (!silent)
+		pr_err("%s(): bad magic number\n", __func__);
+	goto failed;
+
+magic_found:
+	/*
+	 * Check block and fragment sizes
+	 */
+	uspi->s_bsize = fs32_to_cpu(sb, usb1->fs_bsize);
+	uspi->s_fsize = fs32_to_cpu(sb, usb1->fs_fsize);
+	uspi->s_sbsize = fs32_to_cpu(sb, usb1->fs_sbsize);
+	uspi->s_fmask = fs32_to_cpu(sb, usb1->fs_fmask);
+	uspi->s_fshift = fs32_to_cpu(sb, usb1->fs_fshift);
+
+	if (!is_power_of_2(uspi->s_fsize)) {
+		pr_err("%s(): fragment size %u is not a power of 2\n",
+		       __func__, uspi->s_fsize);
+		goto failed;
+	}
+	if (uspi->s_fsize < 512) {
+		pr_err("%s(): fragment size %u is too small\n",
+		       __func__, uspi->s_fsize);
+		goto failed;
+	}
+	if (uspi->s_fsize > 4096) {
+		pr_err("%s(): fragment size %u is too large\n",
+		       __func__, uspi->s_fsize);
+		goto failed;
+	}
+	if (!is_power_of_2(uspi->s_bsize)) {
+		pr_err("%s(): block size %u is not a power of 2\n",
+		       __func__, uspi->s_bsize);
+		goto failed;
+	}
+	if (uspi->s_bsize < 4096) {
+		pr_err("%s(): block size %u is too small\n",
+		       __func__, uspi->s_bsize);
+		goto failed;
+	}
+	if (uspi->s_bsize / uspi->s_fsize > 8) {
+		pr_err("%s(): too many fragments per block (%u)\n",
+		       __func__, uspi->s_bsize / uspi->s_fsize);
+		goto failed;
+	}
+	if (uspi->s_fsize != block_size || uspi->s_sbsize != super_block_size) {
+		ubh_brelse_uspi(uspi);
+		ubh = NULL;
+		block_size = uspi->s_fsize;
+		super_block_size = uspi->s_sbsize;
+		UFSD("another value of block_size or super_block_size %u, %u\n", block_size, super_block_size);
+		goto again;
+	}
+
+	sbi->s_flags = flags;/*after that line some functions use s_flags*/
+	ufs_print_super_stuff(sb, usb1, usb2, usb3);
+
+	/*
+	 * Check, if file system was correctly unmounted.
+	 * If not, make it read only.
+	 */
+	if (((flags & UFS_ST_MASK) == UFS_ST_44BSD) ||
+	  ((flags & UFS_ST_MASK) == UFS_ST_OLD) ||
+	  (((flags & UFS_ST_MASK) == UFS_ST_SUN ||
+	    (flags & UFS_ST_MASK) == UFS_ST_SUNOS ||
+	  (flags & UFS_ST_MASK) == UFS_ST_SUNx86) &&
+	  (ufs_get_fs_state(sb, usb1, usb3) == (UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time))))) {
+		switch(usb1->fs_clean) {
+		case UFS_FSCLEAN:
+			UFSD("fs is clean\n");
+			break;
+		case UFS_FSSTABLE:
+			UFSD("fs is stable\n");
+			break;
+		case UFS_FSLOG:
+			UFSD("fs is logging fs\n");
+			break;
+		case UFS_FSOSF1:
+			UFSD("fs is DEC OSF/1\n");
+			break;
+		case UFS_FSACTIVE:
+			pr_err("%s(): fs is active\n", __func__);
+			sb->s_flags |= SB_RDONLY;
+			break;
+		case UFS_FSBAD:
+			pr_err("%s(): fs is bad\n", __func__);
+			sb->s_flags |= SB_RDONLY;
+			break;
+		default:
+			pr_err("%s(): can't grok fs_clean 0x%x\n",
+			       __func__, usb1->fs_clean);
+			sb->s_flags |= SB_RDONLY;
+			break;
+		}
+	} else {
+		pr_err("%s(): fs needs fsck\n", __func__);
+		sb->s_flags |= SB_RDONLY;
+	}
+
+	/*
+	 * Read ufs_super_block into internal data structures
+	 */
+	sb->s_op = &ufs_super_ops;
+	sb->s_export_op = &ufs_export_ops;
+
+	sb->s_magic = fs32_to_cpu(sb, usb3->fs_magic);
+
+	uspi->s_sblkno = fs32_to_cpu(sb, usb1->fs_sblkno);
+	uspi->s_cblkno = fs32_to_cpu(sb, usb1->fs_cblkno);
+	uspi->s_iblkno = fs32_to_cpu(sb, usb1->fs_iblkno);
+	uspi->s_dblkno = fs32_to_cpu(sb, usb1->fs_dblkno);
+	uspi->s_cgoffset = fs32_to_cpu(sb, usb1->fs_cgoffset);
+	uspi->s_cgmask = fs32_to_cpu(sb, usb1->fs_cgmask);
+
+	if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
+		uspi->s_size  = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_size);
+		uspi->s_dsize = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_dsize);
+	} else {
+		uspi->s_size  =  fs32_to_cpu(sb, usb1->fs_size);
+		uspi->s_dsize =  fs32_to_cpu(sb, usb1->fs_dsize);
+	}
+
+	uspi->s_ncg = fs32_to_cpu(sb, usb1->fs_ncg);
+	/* s_bsize already set */
+	/* s_fsize already set */
+	uspi->s_fpb = fs32_to_cpu(sb, usb1->fs_frag);
+	uspi->s_minfree = fs32_to_cpu(sb, usb1->fs_minfree);
+	uspi->s_bmask = fs32_to_cpu(sb, usb1->fs_bmask);
+	uspi->s_fmask = fs32_to_cpu(sb, usb1->fs_fmask);
+	uspi->s_bshift = fs32_to_cpu(sb, usb1->fs_bshift);
+	uspi->s_fshift = fs32_to_cpu(sb, usb1->fs_fshift);
+	UFSD("uspi->s_bshift = %d,uspi->s_fshift = %d", uspi->s_bshift,
+		uspi->s_fshift);
+	uspi->s_fpbshift = fs32_to_cpu(sb, usb1->fs_fragshift);
+	uspi->s_fsbtodb = fs32_to_cpu(sb, usb1->fs_fsbtodb);
+	/* s_sbsize already set */
+	uspi->s_csmask = fs32_to_cpu(sb, usb1->fs_csmask);
+	uspi->s_csshift = fs32_to_cpu(sb, usb1->fs_csshift);
+	uspi->s_nindir = fs32_to_cpu(sb, usb1->fs_nindir);
+	uspi->s_inopb = fs32_to_cpu(sb, usb1->fs_inopb);
+	uspi->s_nspf = fs32_to_cpu(sb, usb1->fs_nspf);
+	uspi->s_npsect = ufs_get_fs_npsect(sb, usb1, usb3);
+	uspi->s_interleave = fs32_to_cpu(sb, usb1->fs_interleave);
+	uspi->s_trackskew = fs32_to_cpu(sb, usb1->fs_trackskew);
+
+	if (uspi->fs_magic == UFS2_MAGIC)
+		uspi->s_csaddr = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_csaddr);
+	else
+		uspi->s_csaddr = fs32_to_cpu(sb, usb1->fs_csaddr);
+
+	uspi->s_cssize = fs32_to_cpu(sb, usb1->fs_cssize);
+	uspi->s_cgsize = fs32_to_cpu(sb, usb1->fs_cgsize);
+	uspi->s_ntrak = fs32_to_cpu(sb, usb1->fs_ntrak);
+	uspi->s_nsect = fs32_to_cpu(sb, usb1->fs_nsect);
+	uspi->s_spc = fs32_to_cpu(sb, usb1->fs_spc);
+	uspi->s_ipg = fs32_to_cpu(sb, usb1->fs_ipg);
+	uspi->s_fpg = fs32_to_cpu(sb, usb1->fs_fpg);
+	uspi->s_cpc = fs32_to_cpu(sb, usb2->fs_un.fs_u1.fs_cpc);
+	uspi->s_contigsumsize = fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_contigsumsize);
+	uspi->s_qbmask = ufs_get_fs_qbmask(sb, usb3);
+	uspi->s_qfmask = ufs_get_fs_qfmask(sb, usb3);
+	uspi->s_nrpos = fs32_to_cpu(sb, usb3->fs_nrpos);
+	uspi->s_postbloff = fs32_to_cpu(sb, usb3->fs_postbloff);
+	uspi->s_rotbloff = fs32_to_cpu(sb, usb3->fs_rotbloff);
+
+	uspi->s_root_blocks = mul_u64_u32_div(uspi->s_dsize,
+					      uspi->s_minfree, 100);
+	if (uspi->s_minfree <= 5) {
+		uspi->s_time_to_space = ~0ULL;
+		uspi->s_space_to_time = 0;
+		usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTSPACE);
+	} else {
+		uspi->s_time_to_space = (uspi->s_root_blocks / 2) + 1;
+		uspi->s_space_to_time = mul_u64_u32_div(uspi->s_dsize,
+					      uspi->s_minfree - 2, 100) - 1;
+	}
+
+	/*
+	 * Compute another frequently used values
+	 */
+	uspi->s_fpbmask = uspi->s_fpb - 1;
+	if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
+		uspi->s_apbshift = uspi->s_bshift - 3;
+	else
+		uspi->s_apbshift = uspi->s_bshift - 2;
+
+	uspi->s_apb = 1 << uspi->s_apbshift;
+	uspi->s_apbmask = uspi->s_apb - 1;
+	uspi->s_nspfshift = uspi->s_fshift - UFS_SECTOR_BITS;
+	uspi->s_nspb = uspi->s_nspf << uspi->s_fpbshift;
+	uspi->s_inopf = uspi->s_inopb >> uspi->s_fpbshift;
+	uspi->s_bpf = uspi->s_fsize << 3;
+	uspi->s_bpfshift = uspi->s_fshift + 3;
+	uspi->s_bpfmask = uspi->s_bpf - 1;
+	if (sbi->s_flavour == UFS_MOUNT_UFSTYPE_44BSD ||
+	    sbi->s_flavour == UFS_MOUNT_UFSTYPE_UFS2)
+		uspi->s_maxsymlinklen =
+		    fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_maxsymlinklen);
+
+	if (uspi->fs_magic == UFS2_MAGIC)
+		maxsymlen = 2 * 4 * (UFS_NDADDR + UFS_NINDIR);
+	else
+		maxsymlen = 4 * (UFS_NDADDR + UFS_NINDIR);
+	if (uspi->s_maxsymlinklen > maxsymlen) {
+		ufs_warning(sb, __func__, "ufs_read_super: excessive maximum "
+			    "fast symlink size (%u)\n", uspi->s_maxsymlinklen);
+		uspi->s_maxsymlinklen = maxsymlen;
+	}
+	sb->s_maxbytes = ufs_max_bytes(sb);
+	sb->s_max_links = UFS_LINK_MAX;
+
+	inode = ufs_iget(sb, UFS_ROOTINO);
+	if (IS_ERR(inode)) {
+		ret = PTR_ERR(inode);
+		goto failed;
+	}
+	sb->s_root = d_make_root(inode);
+	if (!sb->s_root) {
+		ret = -ENOMEM;
+		goto failed;
+	}
+
+	ufs_setup_cstotal(sb);
+	/*
+	 * Read cylinder group structures
+	 */
+	if (!sb_rdonly(sb))
+		if (!ufs_read_cylinder_structures(sb))
+			goto failed;
+
+	UFSD("EXIT\n");
+	return 0;
+
+failed:
+	if (ubh)
+		ubh_brelse_uspi (uspi);
+	kfree (uspi);
+	kfree(sbi);
+	sb->s_fs_info = NULL;
+	UFSD("EXIT (FAILED)\n");
+	return ret;
+
+failed_nomem:
+	UFSD("EXIT (NOMEM)\n");
+	return -ENOMEM;
+}
+
+static int ufs_reconfigure(struct fs_context *fc)
+{
+	struct ufs_sb_private_info * uspi;
+	struct ufs_super_block_first * usb1;
+	struct ufs_super_block_third * usb3;
+	struct ufs_fs_context *ctx = fc->fs_private;
+	struct super_block *sb = fc->root->d_sb;
+	unsigned int ufstype;
+	unsigned int flags;
+
+	sync_filesystem(sb);
+	mutex_lock(&UFS_SB(sb)->s_lock);
+	uspi = UFS_SB(sb)->s_uspi;
+	flags = UFS_SB(sb)->s_flags;
+	usb1 = ubh_get_usb_first(uspi);
+	usb3 = ubh_get_usb_third(uspi);
+	
+	ufstype = UFS_SB(sb)->s_flavour;
+
+	if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb)) {
+		UFS_SB(sb)->s_on_err = ctx->on_err;
+		mutex_unlock(&UFS_SB(sb)->s_lock);
+		return 0;
+	}
+	
+	/*
+	 * fs was mouted as rw, remounting ro
+	 */
+	if (fc->sb_flags & SB_RDONLY) {
+		ufs_put_super_internal(sb);
+		usb1->fs_time = ufs_get_seconds(sb);
+		if ((flags & UFS_ST_MASK) == UFS_ST_SUN
+		  || (flags & UFS_ST_MASK) == UFS_ST_SUNOS
+		  || (flags & UFS_ST_MASK) == UFS_ST_SUNx86) 
+			ufs_set_fs_state(sb, usb1, usb3,
+				UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time));
+		ubh_mark_buffer_dirty (USPI_UBH(uspi));
+		sb->s_flags |= SB_RDONLY;
+	} else {
+	/*
+	 * fs was mounted as ro, remounting rw
+	 */
+#ifndef CONFIG_UFS_FS_WRITE
+		pr_err("ufs was compiled with read-only support, can't be mounted as read-write\n");
+		mutex_unlock(&UFS_SB(sb)->s_lock);
+		return -EINVAL;
+#else
+		if (ufstype != UFS_MOUNT_UFSTYPE_SUN && 
+		    ufstype != UFS_MOUNT_UFSTYPE_SUNOS &&
+		    ufstype != UFS_MOUNT_UFSTYPE_44BSD &&
+		    ufstype != UFS_MOUNT_UFSTYPE_SUNx86 &&
+		    ufstype != UFS_MOUNT_UFSTYPE_UFS2) {
+			pr_err("this ufstype is read-only supported\n");
+			mutex_unlock(&UFS_SB(sb)->s_lock);
+			return -EINVAL;
+		}
+		if (!ufs_read_cylinder_structures(sb)) {
+			pr_err("failed during remounting\n");
+			mutex_unlock(&UFS_SB(sb)->s_lock);
+			return -EPERM;
+		}
+		sb->s_flags &= ~SB_RDONLY;
+#endif
+	}
+	UFS_SB(sb)->s_on_err = ctx->on_err;
+	mutex_unlock(&UFS_SB(sb)->s_lock);
+	return 0;
+}
+
+static int ufs_show_options(struct seq_file *seq, struct dentry *root)
+{
+	struct ufs_sb_info *sbi = UFS_SB(root->d_sb);
+	unsigned mval = sbi->s_flavour;
+	const struct constant_table *tp;
+
+	tp = ufs_param_ufstype;
+	while (tp->value && tp->value != mval)
+		++tp;
+	seq_printf(seq, ",ufstype=%s", tp->name);
+
+	tp = ufs_param_onerror;
+	mval = sbi->s_on_err;
+	while (tp->value && tp->value != mval)
+		++tp;
+	seq_printf(seq, ",onerror=%s", tp->name);
+
+	return 0;
+}
+
+static int ufs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+	struct super_block *sb = dentry->d_sb;
+	struct ufs_sb_private_info *uspi= UFS_SB(sb)->s_uspi;
+	unsigned  flags = UFS_SB(sb)->s_flags;
+	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
+
+	mutex_lock(&UFS_SB(sb)->s_lock);
+	
+	if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
+		buf->f_type = UFS2_MAGIC;
+	else
+		buf->f_type = UFS_MAGIC;
+
+	buf->f_blocks = uspi->s_dsize;
+	buf->f_bfree = ufs_freefrags(uspi);
+	buf->f_ffree = uspi->cs_total.cs_nifree;
+	buf->f_bsize = sb->s_blocksize;
+	buf->f_bavail = (buf->f_bfree > uspi->s_root_blocks)
+		? (buf->f_bfree - uspi->s_root_blocks) : 0;
+	buf->f_files = uspi->s_ncg * uspi->s_ipg;
+	buf->f_namelen = UFS_MAXNAMLEN;
+	buf->f_fsid = u64_to_fsid(id);
+
+	mutex_unlock(&UFS_SB(sb)->s_lock);
+
+	return 0;
+}
+
+static struct kmem_cache * ufs_inode_cachep;
+
+static struct inode *ufs_alloc_inode(struct super_block *sb)
+{
+	struct ufs_inode_info *ei;
+
+	ei = alloc_inode_sb(sb, ufs_inode_cachep, GFP_NOFS);
+	if (!ei)
+		return NULL;
+
+	inode_set_iversion(&ei->vfs_inode, 1);
+	seqlock_init(&ei->meta_lock);
+	mutex_init(&ei->truncate_mutex);
+	return &ei->vfs_inode;
+}
+
+static void ufs_free_in_core_inode(struct inode *inode)
+{
+	kmem_cache_free(ufs_inode_cachep, UFS_I(inode));
+}
+
+static void init_once(void *foo)
+{
+	struct ufs_inode_info *ei = (struct ufs_inode_info *) foo;
+
+	inode_init_once(&ei->vfs_inode);
+}
+
+static int __init init_inodecache(void)
+{
+	ufs_inode_cachep = kmem_cache_create_usercopy("ufs_inode_cache",
+				sizeof(struct ufs_inode_info), 0,
+				(SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT),
+				offsetof(struct ufs_inode_info, i_u1.i_symlink),
+				sizeof_field(struct ufs_inode_info,
+					i_u1.i_symlink),
+				init_once);
+	if (ufs_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(ufs_inode_cachep);
+}
+
+static const struct super_operations ufs_super_ops = {
+	.alloc_inode	= ufs_alloc_inode,
+	.free_inode	= ufs_free_in_core_inode,
+	.write_inode	= ufs_write_inode,
+	.evict_inode	= ufs_evict_inode,
+	.put_super	= ufs_put_super,
+	.sync_fs	= ufs_sync_fs,
+	.statfs		= ufs_statfs,
+	.show_options   = ufs_show_options,
+};
+
+static int ufs_get_tree(struct fs_context *fc)
+{
+	return get_tree_bdev(fc, ufs_fill_super);
+}
+
+static void ufs_free_fc(struct fs_context *fc)
+{
+	kfree(fc->fs_private);
+}
+
+static const struct fs_context_operations ufs_context_ops = {
+	.parse_param	= ufs_parse_param,
+	.get_tree	= ufs_get_tree,
+	.reconfigure	= ufs_reconfigure,
+	.free		= ufs_free_fc,
+};
+
+static int ufs_init_fs_context(struct fs_context *fc)
+{
+	struct ufs_fs_context *ctx;
+
+	ctx = kzalloc_obj(*ctx);
+	if (!ctx)
+		return -ENOMEM;
+
+	if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
+		struct super_block *sb = fc->root->d_sb;
+		struct ufs_sb_info *sbi = UFS_SB(sb);
+
+		ctx->flavour = sbi->s_flavour;
+		ctx->on_err = sbi->s_on_err;
+	} else {
+		ctx->flavour = 0;
+		ctx->on_err = UFS_MOUNT_ONERROR_LOCK;
+	}
+
+	fc->fs_private = ctx;
+	fc->ops = &ufs_context_ops;
+
+	return 0;
+}
+
+static struct file_system_type ufs_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "ufs",
+	.kill_sb	= kill_block_super,
+	.init_fs_context = ufs_init_fs_context,
+	.parameters	= ufs_param_spec,
+	.fs_flags	= FS_REQUIRES_DEV,
+};
+MODULE_ALIAS_FS("ufs");
+
+static int __init init_ufs_fs(void)
+{
+	int err = init_inodecache();
+	if (err)
+		goto out1;
+	err = register_filesystem(&ufs_fs_type);
+	if (err)
+		goto out;
+	return 0;
+out:
+	destroy_inodecache();
+out1:
+	return err;
+}
+
+static void __exit exit_ufs_fs(void)
+{
+	unregister_filesystem(&ufs_fs_type);
+	destroy_inodecache();
+}
+
+module_init(init_ufs_fs)
+module_exit(exit_ufs_fs)
+MODULE_DESCRIPTION("UFS Filesystem");
+MODULE_LICENSE("GPL");