super.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  linux/fs/ufs/super.c
   4 *
   5 * Copyright (C) 1998
   6 * Daniel Pirkl <daniel.pirkl@email.cz>
   7 * Charles University, Faculty of Mathematics and Physics
   8 */
   9
  10/* Derived from
  11 *
  12 *  linux/fs/ext2/super.c
  13 *
  14 * Copyright (C) 1992, 1993, 1994, 1995
  15 * Remy Card (card@masi.ibp.fr)
  16 * Laboratoire MASI - Institut Blaise Pascal
  17 * Universite Pierre et Marie Curie (Paris VI)
  18 *
  19 *  from
  20 *
  21 *  linux/fs/minix/inode.c
  22 *
  23 *  Copyright (C) 1991, 1992  Linus Torvalds
  24 *
  25 *  Big-endian to little-endian byte-swapping/bitmaps by
  26 *        David S. Miller (davem@caip.rutgers.edu), 1995
  27 */
  28 
  29/*
  30 * Inspired by
  31 *
  32 *  linux/fs/ufs/super.c
  33 *
  34 * Copyright (C) 1996
  35 * Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
  36 * Laboratory for Computer Science Research Computing Facility
  37 * Rutgers, The State University of New Jersey
  38 *
  39 * Copyright (C) 1996  Eddie C. Dost  (ecd@skynet.be)
  40 *
  41 * Kernel module support added on 96/04/26 by
  42 * Stefan Reinauer <stepan@home.culture.mipt.ru>
  43 *
  44 * Module usage counts added on 96/04/29 by
  45 * Gertjan van Wingerde <gwingerde@gmail.com>
  46 *
  47 * Clean swab support on 19970406 by
  48 * Francois-Rene Rideau <fare@tunes.org>
  49 *
  50 * 4.4BSD (FreeBSD) support added on February 1st 1998 by
  51 * Niels Kristian Bech Jensen <nkbj@image.dk> partially based
  52 * on code by Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de>.
  53 *
  54 * NeXTstep support added on February 5th 1998 by
  55 * Niels Kristian Bech Jensen <nkbj@image.dk>.
  56 *
  57 * write support Daniel Pirkl <daniel.pirkl@email.cz> 1998
  58 * 
  59 * HP/UX hfs filesystem support added by
  60 * Martin K. Petersen <mkp@mkp.net>, August 1999
  61 *
  62 * UFS2 (of FreeBSD 5.x) support added by
  63 * Niraj Kumar <niraj17@iitbombay.org>, Jan 2004
  64 *
  65 * UFS2 write support added by
  66 * Evgeniy Dushistov <dushistov@mail.ru>, 2007
  67 */
  68
  69#include <linux/exportfs.h>
  70#include <linux/module.h>
  71#include <linux/bitops.h>
  72
  73#include <linux/stdarg.h>
  74
  75#include <linux/uaccess.h>
  76
  77#include <linux/errno.h>
  78#include <linux/fs.h>
  79#include <linux/slab.h>
  80#include <linux/time.h>
  81#include <linux/stat.h>
  82#include <linux/string.h>
  83#include <linux/blkdev.h>
  84#include <linux/backing-dev.h>
  85#include <linux/init.h>
  86#include <linux/fs_context.h>
  87#include <linux/fs_parser.h>
  88#include <linux/buffer_head.h>
  89#include <linux/vfs.h>
  90#include <linux/log2.h>
  91#include <linux/seq_file.h>
  92#include <linux/iversion.h>
  93
  94#include "ufs_fs.h"
  95#include "ufs.h"
  96#include "swab.h"
  97#include "util.h"
  98
  99static struct inode *ufs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation)
 100{
 101	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 102	struct inode *inode;
 103
 104	if (ino < UFS_ROOTINO || ino > (u64)uspi->s_ncg * uspi->s_ipg)
 105		return ERR_PTR(-ESTALE);
 106
 107	inode = ufs_iget(sb, ino);
 108	if (IS_ERR(inode))
 109		return ERR_CAST(inode);
 110	if (generation && inode->i_generation != generation) {
 111		iput(inode);
 112		return ERR_PTR(-ESTALE);
 113	}
 114	return inode;
 115}
 116
 117static struct dentry *ufs_fh_to_dentry(struct super_block *sb, struct fid *fid,
 118				       int fh_len, int fh_type)
 119{
 120	return generic_fh_to_dentry(sb, fid, fh_len, fh_type, ufs_nfs_get_inode);
 121}
 122
 123static struct dentry *ufs_fh_to_parent(struct super_block *sb, struct fid *fid,
 124				       int fh_len, int fh_type)
 125{
 126	return generic_fh_to_parent(sb, fid, fh_len, fh_type, ufs_nfs_get_inode);
 127}
 128
 129static struct dentry *ufs_get_parent(struct dentry *child)
 130{
 131	ino_t ino;
 132
 133	ino = ufs_inode_by_name(d_inode(child), &dotdot_name);
 134	if (!ino)
 135		return ERR_PTR(-ENOENT);
 136	return d_obtain_alias(ufs_iget(child->d_sb, ino));
 137}
 138
 139static const struct export_operations ufs_export_ops = {
 140	.encode_fh = generic_encode_ino32_fh,
 141	.fh_to_dentry	= ufs_fh_to_dentry,
 142	.fh_to_parent	= ufs_fh_to_parent,
 143	.get_parent	= ufs_get_parent,
 144};
 145
 146#ifdef CONFIG_UFS_DEBUG
 147/*
 148 * Print contents of ufs_super_block, useful for debugging
 149 */
 150static void ufs_print_super_stuff(struct super_block *sb,
 151				  struct ufs_super_block_first *usb1,
 152				  struct ufs_super_block_second *usb2,
 153				  struct ufs_super_block_third *usb3)
 154{
 155	u32 magic = fs32_to_cpu(sb, usb3->fs_magic);
 156
 157	pr_debug("ufs_print_super_stuff\n");
 158	pr_debug("  magic:     0x%x\n", magic);
 159	if (fs32_to_cpu(sb, usb3->fs_magic) == UFS2_MAGIC) {
 160		pr_debug("  fs_size:   %llu\n", (unsigned long long)
 161			 fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_size));
 162		pr_debug("  fs_dsize:  %llu\n", (unsigned long long)
 163			 fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_dsize));
 164		pr_debug("  bsize:         %u\n",
 165			 fs32_to_cpu(sb, usb1->fs_bsize));
 166		pr_debug("  fsize:         %u\n",
 167			 fs32_to_cpu(sb, usb1->fs_fsize));
 168		pr_debug("  fs_volname:  %s\n", usb2->fs_un.fs_u2.fs_volname);
 169		pr_debug("  fs_sblockloc: %llu\n", (unsigned long long)
 170			 fs64_to_cpu(sb, usb2->fs_un.fs_u2.fs_sblockloc));
 171		pr_debug("  cs_ndir(No of dirs):  %llu\n", (unsigned long long)
 172			 fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_ndir));
 173		pr_debug("  cs_nbfree(No of free blocks):  %llu\n",
 174			 (unsigned long long)
 175			 fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_nbfree));
 176		pr_info("  cs_nifree(Num of free inodes): %llu\n",
 177			(unsigned long long)
 178			fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nifree));
 179		pr_info("  cs_nffree(Num of free frags): %llu\n",
 180			(unsigned long long)
 181			fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nffree));
 182		pr_info("  fs_maxsymlinklen: %u\n",
 183			fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_maxsymlinklen));
 184	} else {
 185		pr_debug(" sblkno:      %u\n", fs32_to_cpu(sb, usb1->fs_sblkno));
 186		pr_debug(" cblkno:      %u\n", fs32_to_cpu(sb, usb1->fs_cblkno));
 187		pr_debug(" iblkno:      %u\n", fs32_to_cpu(sb, usb1->fs_iblkno));
 188		pr_debug(" dblkno:      %u\n", fs32_to_cpu(sb, usb1->fs_dblkno));
 189		pr_debug(" cgoffset:    %u\n",
 190			 fs32_to_cpu(sb, usb1->fs_cgoffset));
 191		pr_debug(" ~cgmask:     0x%x\n",
 192			 ~fs32_to_cpu(sb, usb1->fs_cgmask));
 193		pr_debug(" size:        %u\n", fs32_to_cpu(sb, usb1->fs_size));
 194		pr_debug(" dsize:       %u\n", fs32_to_cpu(sb, usb1->fs_dsize));
 195		pr_debug(" ncg:         %u\n", fs32_to_cpu(sb, usb1->fs_ncg));
 196		pr_debug(" bsize:       %u\n", fs32_to_cpu(sb, usb1->fs_bsize));
 197		pr_debug(" fsize:       %u\n", fs32_to_cpu(sb, usb1->fs_fsize));
 198		pr_debug(" frag:        %u\n", fs32_to_cpu(sb, usb1->fs_frag));
 199		pr_debug(" fragshift:   %u\n",
 200			 fs32_to_cpu(sb, usb1->fs_fragshift));
 201		pr_debug(" ~fmask:      %u\n", ~fs32_to_cpu(sb, usb1->fs_fmask));
 202		pr_debug(" fshift:      %u\n", fs32_to_cpu(sb, usb1->fs_fshift));
 203		pr_debug(" sbsize:      %u\n", fs32_to_cpu(sb, usb1->fs_sbsize));
 204		pr_debug(" spc:         %u\n", fs32_to_cpu(sb, usb1->fs_spc));
 205		pr_debug(" cpg:         %u\n", fs32_to_cpu(sb, usb1->fs_cpg));
 206		pr_debug(" ipg:         %u\n", fs32_to_cpu(sb, usb1->fs_ipg));
 207		pr_debug(" fpg:         %u\n", fs32_to_cpu(sb, usb1->fs_fpg));
 208		pr_debug(" csaddr:      %u\n", fs32_to_cpu(sb, usb1->fs_csaddr));
 209		pr_debug(" cssize:      %u\n", fs32_to_cpu(sb, usb1->fs_cssize));
 210		pr_debug(" cgsize:      %u\n", fs32_to_cpu(sb, usb1->fs_cgsize));
 211		pr_debug(" fstodb:      %u\n",
 212			 fs32_to_cpu(sb, usb1->fs_fsbtodb));
 213		pr_debug(" nrpos:       %u\n", fs32_to_cpu(sb, usb3->fs_nrpos));
 214		pr_debug(" ndir         %u\n",
 215			 fs32_to_cpu(sb, usb1->fs_cstotal.cs_ndir));
 216		pr_debug(" nifree       %u\n",
 217			 fs32_to_cpu(sb, usb1->fs_cstotal.cs_nifree));
 218		pr_debug(" nbfree       %u\n",
 219			 fs32_to_cpu(sb, usb1->fs_cstotal.cs_nbfree));
 220		pr_debug(" nffree       %u\n",
 221			 fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree));
 222	}
 223	pr_debug("\n");
 224}
 225
 226/*
 227 * Print contents of ufs_cylinder_group, useful for debugging
 228 */
 229static void ufs_print_cylinder_stuff(struct super_block *sb,
 230				     struct ufs_cylinder_group *cg)
 231{
 232	pr_debug("\nufs_print_cylinder_stuff\n");
 233	pr_debug("size of ucg: %zu\n", sizeof(struct ufs_cylinder_group));
 234	pr_debug("  magic:        %x\n", fs32_to_cpu(sb, cg->cg_magic));
 235	pr_debug("  time:         %u\n", fs32_to_cpu(sb, cg->cg_time));
 236	pr_debug("  cgx:          %u\n", fs32_to_cpu(sb, cg->cg_cgx));
 237	pr_debug("  ncyl:         %u\n", fs16_to_cpu(sb, cg->cg_ncyl));
 238	pr_debug("  niblk:        %u\n", fs16_to_cpu(sb, cg->cg_niblk));
 239	pr_debug("  ndblk:        %u\n", fs32_to_cpu(sb, cg->cg_ndblk));
 240	pr_debug("  cs_ndir:      %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_ndir));
 241	pr_debug("  cs_nbfree:    %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_nbfree));
 242	pr_debug("  cs_nifree:    %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_nifree));
 243	pr_debug("  cs_nffree:    %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_nffree));
 244	pr_debug("  rotor:        %u\n", fs32_to_cpu(sb, cg->cg_rotor));
 245	pr_debug("  frotor:       %u\n", fs32_to_cpu(sb, cg->cg_frotor));
 246	pr_debug("  irotor:       %u\n", fs32_to_cpu(sb, cg->cg_irotor));
 247	pr_debug("  frsum:        %u, %u, %u, %u, %u, %u, %u, %u\n",
 248	    fs32_to_cpu(sb, cg->cg_frsum[0]), fs32_to_cpu(sb, cg->cg_frsum[1]),
 249	    fs32_to_cpu(sb, cg->cg_frsum[2]), fs32_to_cpu(sb, cg->cg_frsum[3]),
 250	    fs32_to_cpu(sb, cg->cg_frsum[4]), fs32_to_cpu(sb, cg->cg_frsum[5]),
 251	    fs32_to_cpu(sb, cg->cg_frsum[6]), fs32_to_cpu(sb, cg->cg_frsum[7]));
 252	pr_debug("  btotoff:      %u\n", fs32_to_cpu(sb, cg->cg_btotoff));
 253	pr_debug("  boff:         %u\n", fs32_to_cpu(sb, cg->cg_boff));
 254	pr_debug("  iuseoff:      %u\n", fs32_to_cpu(sb, cg->cg_iusedoff));
 255	pr_debug("  freeoff:      %u\n", fs32_to_cpu(sb, cg->cg_freeoff));
 256	pr_debug("  nextfreeoff:  %u\n", fs32_to_cpu(sb, cg->cg_nextfreeoff));
 257	pr_debug("  clustersumoff %u\n",
 258		 fs32_to_cpu(sb, cg->cg_u.cg_44.cg_clustersumoff));
 259	pr_debug("  clusteroff    %u\n",
 260		 fs32_to_cpu(sb, cg->cg_u.cg_44.cg_clusteroff));
 261	pr_debug("  nclusterblks  %u\n",
 262		 fs32_to_cpu(sb, cg->cg_u.cg_44.cg_nclusterblks));
 263	pr_debug("\n");
 264}
 265#else
 266#  define ufs_print_super_stuff(sb, usb1, usb2, usb3) /**/
 267#  define ufs_print_cylinder_stuff(sb, cg) /**/
 268#endif /* CONFIG_UFS_DEBUG */
 269
 270static const struct super_operations ufs_super_ops;
 271
 272void ufs_error (struct super_block * sb, const char * function,
 273	const char * fmt, ...)
 274{
 275	struct ufs_sb_private_info * uspi;
 276	struct ufs_super_block_first * usb1;
 277	struct va_format vaf;
 278	va_list args;
 279
 280	uspi = UFS_SB(sb)->s_uspi;
 281	usb1 = ubh_get_usb_first(uspi);
 282	
 283	if (!sb_rdonly(sb)) {
 284		usb1->fs_clean = UFS_FSBAD;
 285		ubh_mark_buffer_dirty(USPI_UBH(uspi));
 286		ufs_mark_sb_dirty(sb);
 287		sb->s_flags |= SB_RDONLY;
 288	}
 289	va_start(args, fmt);
 290	vaf.fmt = fmt;
 291	vaf.va = &args;
 292	switch (UFS_SB(sb)->s_on_err) {
 293	case UFS_MOUNT_ONERROR_PANIC:
 294		panic("panic (device %s): %s: %pV\n",
 295		      sb->s_id, function, &vaf);
 296
 297	case UFS_MOUNT_ONERROR_LOCK:
 298	case UFS_MOUNT_ONERROR_UMOUNT:
 299	case UFS_MOUNT_ONERROR_REPAIR:
 300		pr_crit("error (device %s): %s: %pV\n",
 301			sb->s_id, function, &vaf);
 302	}
 303	va_end(args);
 304}
 305
 306void ufs_panic (struct super_block * sb, const char * function,
 307	const char * fmt, ...)
 308{
 309	struct ufs_sb_private_info * uspi;
 310	struct ufs_super_block_first * usb1;
 311	struct va_format vaf;
 312	va_list args;
 313	
 314	uspi = UFS_SB(sb)->s_uspi;
 315	usb1 = ubh_get_usb_first(uspi);
 316	
 317	if (!sb_rdonly(sb)) {
 318		usb1->fs_clean = UFS_FSBAD;
 319		ubh_mark_buffer_dirty(USPI_UBH(uspi));
 320		ufs_mark_sb_dirty(sb);
 321	}
 322	va_start(args, fmt);
 323	vaf.fmt = fmt;
 324	vaf.va = &args;
 325	sb->s_flags |= SB_RDONLY;
 326	pr_crit("panic (device %s): %s: %pV\n",
 327		sb->s_id, function, &vaf);
 328	va_end(args);
 329}
 330
 331void ufs_warning (struct super_block * sb, const char * function,
 332	const char * fmt, ...)
 333{
 334	struct va_format vaf;
 335	va_list args;
 336
 337	va_start(args, fmt);
 338	vaf.fmt = fmt;
 339	vaf.va = &args;
 340	pr_warn("(device %s): %s: %pV\n",
 341		sb->s_id, function, &vaf);
 342	va_end(args);
 343}
 344
 345enum { Opt_type, Opt_onerror };
 346
 347static const struct constant_table ufs_param_ufstype[] = {
 348	{"old",		UFS_MOUNT_UFSTYPE_OLD},
 349	{"sunx86",	UFS_MOUNT_UFSTYPE_SUNx86},
 350	{"sun",		UFS_MOUNT_UFSTYPE_SUN},
 351	{"sunos",	UFS_MOUNT_UFSTYPE_SUNOS},
 352	{"44bsd",	UFS_MOUNT_UFSTYPE_44BSD},
 353	{"ufs2",	UFS_MOUNT_UFSTYPE_UFS2},
 354	{"5xbsd",	UFS_MOUNT_UFSTYPE_UFS2},
 355	{"hp",		UFS_MOUNT_UFSTYPE_HP},
 356	{"nextstep-cd",	UFS_MOUNT_UFSTYPE_NEXTSTEP_CD},
 357	{"nextstep",	UFS_MOUNT_UFSTYPE_NEXTSTEP},
 358	{"openstep",	UFS_MOUNT_UFSTYPE_OPENSTEP},
 359	{}
 360};
 361
 362static const struct constant_table ufs_param_onerror[] = {
 363	{"panic",	UFS_MOUNT_ONERROR_PANIC},
 364	{"lock",	UFS_MOUNT_ONERROR_LOCK},
 365	{"umount",	UFS_MOUNT_ONERROR_UMOUNT},
 366	{"repair",	UFS_MOUNT_ONERROR_REPAIR},
 367	{}
 368};
 369
 370static const struct fs_parameter_spec ufs_param_spec[] = {
 371	fsparam_enum	("ufstype",	Opt_type, ufs_param_ufstype),
 372	fsparam_enum	("onerror",	Opt_onerror, ufs_param_onerror),
 373	{}
 374};
 375
 376struct ufs_fs_context {
 377	unsigned int flavour, on_err;
 378};
 379
 380static int ufs_parse_param(struct fs_context *fc, struct fs_parameter *param)
 381{
 382	struct ufs_fs_context *ctx = fc->fs_private;
 383	struct fs_parse_result result;
 384	int opt;
 385
 386	UFSD("ENTER\n");
 387
 388	opt = fs_parse(fc, ufs_param_spec, param, &result);
 389	if (opt < 0)
 390		return opt;
 391
 392	switch (opt) {
 393	case Opt_type:
 394		if (ctx->flavour == result.uint_32) /* no-op */
 395			return 0;
 396		if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
 397			pr_err("ufstype can't be changed during remount\n");
 398			return -EINVAL;
 399		}
 400                if (ctx->flavour) {
 401			pr_err("conflicting ufstype options\n");
 402			return -EINVAL;
 403		}
 404		ctx->flavour = result.uint_32;
 405		break;
 406	case Opt_onerror:
 407		ctx->on_err = result.uint_32;
 408		break;
 409	default:
 410		return -EINVAL;
 411	}
 412	return 0;
 413}
 414
 415/*
 416 * Different types of UFS hold fs_cstotal in different
 417 * places, and use different data structure for it.
 418 * To make things simpler we just copy fs_cstotal to ufs_sb_private_info
 419 */
 420static void ufs_setup_cstotal(struct super_block *sb)
 421{
 422	struct ufs_sb_info *sbi = UFS_SB(sb);
 423	struct ufs_sb_private_info *uspi = sbi->s_uspi;
 424	struct ufs_super_block_first *usb1;
 425	struct ufs_super_block_second *usb2;
 426	struct ufs_super_block_third *usb3;
 427	unsigned mtype = sbi->s_flavour;
 428
 429	UFSD("ENTER, mtype=%u\n", mtype);
 430	usb1 = ubh_get_usb_first(uspi);
 431	usb2 = ubh_get_usb_second(uspi);
 432	usb3 = ubh_get_usb_third(uspi);
 433
 434	if ((mtype == UFS_MOUNT_UFSTYPE_44BSD &&
 435	     (usb2->fs_un.fs_u2.fs_maxbsize == usb1->fs_bsize)) ||
 436	    mtype == UFS_MOUNT_UFSTYPE_UFS2) {
 437		/*we have statistic in different place, then usual*/
 438		uspi->cs_total.cs_ndir = fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_ndir);
 439		uspi->cs_total.cs_nbfree = fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_nbfree);
 440		uspi->cs_total.cs_nifree = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nifree);
 441		uspi->cs_total.cs_nffree = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nffree);
 442	} else {
 443		uspi->cs_total.cs_ndir = fs32_to_cpu(sb, usb1->fs_cstotal.cs_ndir);
 444		uspi->cs_total.cs_nbfree = fs32_to_cpu(sb, usb1->fs_cstotal.cs_nbfree);
 445		uspi->cs_total.cs_nifree = fs32_to_cpu(sb, usb1->fs_cstotal.cs_nifree);
 446		uspi->cs_total.cs_nffree = fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree);
 447	}
 448	UFSD("EXIT\n");
 449}
 450
 451/*
 452 * Read on-disk structures associated with cylinder groups
 453 */
 454static int ufs_read_cylinder_structures(struct super_block *sb)
 455{
 456	struct ufs_sb_info *sbi = UFS_SB(sb);
 457	struct ufs_sb_private_info *uspi = sbi->s_uspi;
 458	unsigned char * base, * space;
 459	unsigned size, blks, i;
 460
 461	UFSD("ENTER\n");
 462
 463	/*
 464	 * Read cs structures from (usually) first data block
 465	 * on the device. 
 466	 */
 467	size = uspi->s_cssize;
 468	blks = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
 469	base = space = kmalloc(size, GFP_NOFS);
 470	if (!base)
 471		goto failed; 
 472	sbi->s_csp = (struct ufs_csum *)space;
 473	for (i = 0; i < blks; i++) {
 474		struct buffer_head *bh = sb_bread(sb, uspi->s_csaddr + i);
 475		if (!bh)
 476			goto failed;
 477		memcpy(space, bh->b_data, uspi->s_fsize);
 478		space += uspi->s_fsize;
 479		brelse (bh);
 480	}
 481
 482	/*
 483	 * Read cylinder group (we read only first fragment from block
 484	 * at this time) and prepare internal data structures for cg caching.
 485	 */
 486	sbi->s_ucg = kmalloc_array(uspi->s_ncg, sizeof(struct buffer_head *),
 487				   GFP_NOFS);
 488	if (!sbi->s_ucg)
 489		goto failed;
 490	for (i = 0; i < uspi->s_ncg; i++) 
 491		sbi->s_ucg[i] = NULL;
 492	for (i = 0; i < UFS_MAX_GROUP_LOADED; i++) {
 493		sbi->s_ucpi[i] = NULL;
 494		sbi->s_cgno[i] = UFS_CGNO_EMPTY;
 495	}
 496	for (i = 0; i < uspi->s_ncg; i++) {
 497		UFSD("read cg %u\n", i);
 498		if (!(sbi->s_ucg[i] = sb_bread(sb, ufs_cgcmin(i))))
 499			goto failed;
 500		if (!ufs_cg_chkmagic (sb, (struct ufs_cylinder_group *) sbi->s_ucg[i]->b_data))
 501			goto failed;
 502
 503		ufs_print_cylinder_stuff(sb, (struct ufs_cylinder_group *) sbi->s_ucg[i]->b_data);
 504	}
 505	for (i = 0; i < UFS_MAX_GROUP_LOADED; i++) {
 506		if (!(sbi->s_ucpi[i] = kmalloc (sizeof(struct ufs_cg_private_info), GFP_NOFS)))
 507			goto failed;
 508		sbi->s_cgno[i] = UFS_CGNO_EMPTY;
 509	}
 510	sbi->s_cg_loaded = 0;
 511	UFSD("EXIT\n");
 512	return 1;
 513
 514failed:
 515	kfree (base);
 516	if (sbi->s_ucg) {
 517		for (i = 0; i < uspi->s_ncg; i++)
 518			if (sbi->s_ucg[i])
 519				brelse (sbi->s_ucg[i]);
 520		kfree (sbi->s_ucg);
 521		for (i = 0; i < UFS_MAX_GROUP_LOADED; i++)
 522			kfree (sbi->s_ucpi[i]);
 523	}
 524	UFSD("EXIT (FAILED)\n");
 525	return 0;
 526}
 527
 528/*
 529 * Sync our internal copy of fs_cstotal with disk
 530 */
 531static void ufs_put_cstotal(struct super_block *sb)
 532{
 533	unsigned mtype = UFS_SB(sb)->s_flavour;
 534	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 535	struct ufs_super_block_first *usb1;
 536	struct ufs_super_block_second *usb2;
 537	struct ufs_super_block_third *usb3;
 538
 539	UFSD("ENTER\n");
 540	usb1 = ubh_get_usb_first(uspi);
 541	usb2 = ubh_get_usb_second(uspi);
 542	usb3 = ubh_get_usb_third(uspi);
 543
 544	if (mtype == UFS_MOUNT_UFSTYPE_UFS2) {
 545		/*we have statistic in different place, then usual*/
 546		usb2->fs_un.fs_u2.cs_ndir =
 547			cpu_to_fs64(sb, uspi->cs_total.cs_ndir);
 548		usb2->fs_un.fs_u2.cs_nbfree =
 549			cpu_to_fs64(sb, uspi->cs_total.cs_nbfree);
 550		usb3->fs_un1.fs_u2.cs_nifree =
 551			cpu_to_fs64(sb, uspi->cs_total.cs_nifree);
 552		usb3->fs_un1.fs_u2.cs_nffree =
 553			cpu_to_fs64(sb, uspi->cs_total.cs_nffree);
 554		goto out;
 555	}
 556
 557	if (mtype == UFS_MOUNT_UFSTYPE_44BSD &&
 558	     (usb2->fs_un.fs_u2.fs_maxbsize == usb1->fs_bsize)) {
 559		/* store stats in both old and new places */
 560		usb2->fs_un.fs_u2.cs_ndir =
 561			cpu_to_fs64(sb, uspi->cs_total.cs_ndir);
 562		usb2->fs_un.fs_u2.cs_nbfree =
 563			cpu_to_fs64(sb, uspi->cs_total.cs_nbfree);
 564		usb3->fs_un1.fs_u2.cs_nifree =
 565			cpu_to_fs64(sb, uspi->cs_total.cs_nifree);
 566		usb3->fs_un1.fs_u2.cs_nffree =
 567			cpu_to_fs64(sb, uspi->cs_total.cs_nffree);
 568	}
 569	usb1->fs_cstotal.cs_ndir = cpu_to_fs32(sb, uspi->cs_total.cs_ndir);
 570	usb1->fs_cstotal.cs_nbfree = cpu_to_fs32(sb, uspi->cs_total.cs_nbfree);
 571	usb1->fs_cstotal.cs_nifree = cpu_to_fs32(sb, uspi->cs_total.cs_nifree);
 572	usb1->fs_cstotal.cs_nffree = cpu_to_fs32(sb, uspi->cs_total.cs_nffree);
 573out:
 574	ubh_mark_buffer_dirty(USPI_UBH(uspi));
 575	ufs_print_super_stuff(sb, usb1, usb2, usb3);
 576	UFSD("EXIT\n");
 577}
 578
 579/**
 580 * ufs_put_super_internal() - put on-disk intrenal structures
 581 * @sb: pointer to super_block structure
 582 * Put on-disk structures associated with cylinder groups
 583 * and write them back to disk, also update cs_total on disk
 584 */
 585static void ufs_put_super_internal(struct super_block *sb)
 586{
 587	struct ufs_sb_info *sbi = UFS_SB(sb);
 588	struct ufs_sb_private_info *uspi = sbi->s_uspi;
 589	unsigned char * base, * space;
 590	unsigned blks, size, i;
 591
 592	
 593	UFSD("ENTER\n");
 594
 595	ufs_put_cstotal(sb);
 596	size = uspi->s_cssize;
 597	blks = (size + uspi->s_fsize - 1) >> uspi->s_fshift;
 598	base = space = (char*) sbi->s_csp;
 599	for (i = 0; i < blks; i++, space += uspi->s_fsize) {
 600		struct buffer_head *bh = sb_bread(sb, uspi->s_csaddr + i);
 601
 602		if (unlikely(!bh)) { // better than an oops...
 603			ufs_panic(sb, __func__,
 604				"can't write part of cylinder group summary");
 605			continue;
 606		}
 607		memcpy(bh->b_data, space, uspi->s_fsize);
 608		mark_buffer_dirty(bh);
 609		brelse(bh);
 610	}
 611	for (i = 0; i < sbi->s_cg_loaded; i++) {
 612		ufs_put_cylinder (sb, i);
 613		kfree (sbi->s_ucpi[i]);
 614	}
 615	for (; i < UFS_MAX_GROUP_LOADED; i++) 
 616		kfree (sbi->s_ucpi[i]);
 617	for (i = 0; i < uspi->s_ncg; i++) 
 618		brelse (sbi->s_ucg[i]);
 619	kfree (sbi->s_ucg);
 620	kfree (base);
 621
 622	UFSD("EXIT\n");
 623}
 624
 625static int ufs_sync_fs(struct super_block *sb, int wait)
 626{
 627	struct ufs_sb_private_info * uspi;
 628	struct ufs_super_block_first * usb1;
 629	struct ufs_super_block_third * usb3;
 630	unsigned flags;
 631
 632	mutex_lock(&UFS_SB(sb)->s_lock);
 633
 634	UFSD("ENTER\n");
 635
 636	flags = UFS_SB(sb)->s_flags;
 637	uspi = UFS_SB(sb)->s_uspi;
 638	usb1 = ubh_get_usb_first(uspi);
 639	usb3 = ubh_get_usb_third(uspi);
 640
 641	usb1->fs_time = ufs_get_seconds(sb);
 642	if ((flags & UFS_ST_MASK) == UFS_ST_SUN  ||
 643	    (flags & UFS_ST_MASK) == UFS_ST_SUNOS ||
 644	    (flags & UFS_ST_MASK) == UFS_ST_SUNx86)
 645		ufs_set_fs_state(sb, usb1, usb3,
 646				UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time));
 647	ufs_put_cstotal(sb);
 648
 649	UFSD("EXIT\n");
 650	mutex_unlock(&UFS_SB(sb)->s_lock);
 651
 652	return 0;
 653}
 654
 655static void delayed_sync_fs(struct work_struct *work)
 656{
 657	struct ufs_sb_info *sbi;
 658
 659	sbi = container_of(work, struct ufs_sb_info, sync_work.work);
 660
 661	spin_lock(&sbi->work_lock);
 662	sbi->work_queued = 0;
 663	spin_unlock(&sbi->work_lock);
 664
 665	ufs_sync_fs(sbi->sb, 1);
 666}
 667
 668void ufs_mark_sb_dirty(struct super_block *sb)
 669{
 670	struct ufs_sb_info *sbi = UFS_SB(sb);
 671	unsigned long delay;
 672
 673	spin_lock(&sbi->work_lock);
 674	if (!sbi->work_queued) {
 675		delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 676		queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
 677		sbi->work_queued = 1;
 678	}
 679	spin_unlock(&sbi->work_lock);
 680}
 681
 682static void ufs_put_super(struct super_block *sb)
 683{
 684	struct ufs_sb_info * sbi = UFS_SB(sb);
 685
 686	UFSD("ENTER\n");
 687
 688	if (!sb_rdonly(sb))
 689		ufs_put_super_internal(sb);
 690	cancel_delayed_work_sync(&sbi->sync_work);
 691
 692	ubh_brelse_uspi (sbi->s_uspi);
 693	kfree (sbi->s_uspi);
 694	kfree (sbi);
 695	sb->s_fs_info = NULL;
 696	UFSD("EXIT\n");
 697	return;
 698}
 699
 700static u64 ufs_max_bytes(struct super_block *sb)
 701{
 702	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
 703	int bits = uspi->s_apbshift;
 704	u64 res;
 705
 706	if (bits > 21)
 707		res = ~0ULL;
 708	else
 709		res = UFS_NDADDR + (1LL << bits) + (1LL << (2*bits)) +
 710			(1LL << (3*bits));
 711
 712	if (res >= (MAX_LFS_FILESIZE >> uspi->s_bshift))
 713		return MAX_LFS_FILESIZE;
 714	return res << uspi->s_bshift;
 715}
 716
 717static int ufs_fill_super(struct super_block *sb, struct fs_context *fc)
 718{
 719	struct ufs_fs_context *ctx = fc->fs_private;
 720	int silent = fc->sb_flags & SB_SILENT;
 721	struct ufs_sb_info * sbi;
 722	struct ufs_sb_private_info * uspi;
 723	struct ufs_super_block_first * usb1;
 724	struct ufs_super_block_second * usb2;
 725	struct ufs_super_block_third * usb3;
 726	struct ufs_buffer_head * ubh;	
 727	struct inode *inode;
 728	unsigned block_size, super_block_size;
 729	unsigned flags;
 730	unsigned super_block_offset;
 731	unsigned maxsymlen;
 732	int ret = -EINVAL;
 733
 734	uspi = NULL;
 735	ubh = NULL;
 736	flags = 0;
 737	
 738	UFSD("ENTER\n");
 739
 740#ifndef CONFIG_UFS_FS_WRITE
 741	if (!sb_rdonly(sb)) {
 742		pr_err("ufs was compiled with read-only support, can't be mounted as read-write\n");
 743		return -EROFS;
 744	}
 745#endif
 746		
 747	sbi = kzalloc(sizeof(struct ufs_sb_info), GFP_KERNEL);
 748	if (!sbi)
 749		goto failed_nomem;
 750	sb->s_fs_info = sbi;
 751	sbi->sb = sb;
 752
 753	UFSD("flag %u\n", (int)(sb_rdonly(sb)));
 754	
 755	mutex_init(&sbi->s_lock);
 756	spin_lock_init(&sbi->work_lock);
 757	INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
 758
 759	sbi->s_flavour = ctx->flavour;
 760	sbi->s_on_err = ctx->on_err;
 761
 762	if (!sbi->s_flavour) {
 763		if (!silent)
 764			pr_err("You didn't specify the type of your ufs filesystem\n\n"
 765			"mount -t ufs -o ufstype="
 766			"sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...\n\n"
 767			">>>WARNING<<< Wrong ufstype may corrupt your filesystem, "
 768			"default is ufstype=old\n");
 769		sbi->s_flavour = UFS_MOUNT_UFSTYPE_OLD;
 770	}
 771
 772	uspi = kzalloc(sizeof(struct ufs_sb_private_info), GFP_KERNEL);
 773	sbi->s_uspi = uspi;
 774	if (!uspi)
 775		goto failed;
 776	uspi->s_dirblksize = UFS_SECTOR_SIZE;
 777	super_block_offset=UFS_SBLOCK;
 778
 779	sb->s_maxbytes = MAX_LFS_FILESIZE;
 780
 781	sb->s_time_gran = NSEC_PER_SEC;
 782	sb->s_time_min = S32_MIN;
 783	sb->s_time_max = S32_MAX;
 784
 785	switch (sbi->s_flavour) {
 786	case UFS_MOUNT_UFSTYPE_44BSD:
 787		UFSD("ufstype=44bsd\n");
 788		uspi->s_fsize = block_size = 512;
 789		uspi->s_fmask = ~(512 - 1);
 790		uspi->s_fshift = 9;
 791		uspi->s_sbsize = super_block_size = 1536;
 792		uspi->s_sbbase = 0;
 793		flags |= UFS_DE_44BSD | UFS_UID_44BSD | UFS_ST_44BSD | UFS_CG_44BSD;
 794		break;
 795	case UFS_MOUNT_UFSTYPE_UFS2:
 796		UFSD("ufstype=ufs2\n");
 797		super_block_offset=SBLOCK_UFS2;
 798		uspi->s_fsize = block_size = 512;
 799		uspi->s_fmask = ~(512 - 1);
 800		uspi->s_fshift = 9;
 801		uspi->s_sbsize = super_block_size = 1536;
 802		uspi->s_sbbase =  0;
 803		sb->s_time_gran = 1;
 804		sb->s_time_min = S64_MIN;
 805		sb->s_time_max = S64_MAX;
 806		flags |= UFS_TYPE_UFS2 | UFS_DE_44BSD | UFS_UID_44BSD | UFS_ST_44BSD | UFS_CG_44BSD;
 807		break;
 808		
 809	case UFS_MOUNT_UFSTYPE_SUN:
 810		UFSD("ufstype=sun\n");
 811		uspi->s_fsize = block_size = 1024;
 812		uspi->s_fmask = ~(1024 - 1);
 813		uspi->s_fshift = 10;
 814		uspi->s_sbsize = super_block_size = 2048;
 815		uspi->s_sbbase = 0;
 816		uspi->s_maxsymlinklen = 0; /* Not supported on disk */
 817		flags |= UFS_DE_OLD | UFS_UID_EFT | UFS_ST_SUN | UFS_CG_SUN;
 818		break;
 819
 820	case UFS_MOUNT_UFSTYPE_SUNOS:
 821		UFSD("ufstype=sunos\n");
 822		uspi->s_fsize = block_size = 1024;
 823		uspi->s_fmask = ~(1024 - 1);
 824		uspi->s_fshift = 10;
 825		uspi->s_sbsize = 2048;
 826		super_block_size = 2048;
 827		uspi->s_sbbase = 0;
 828		uspi->s_maxsymlinklen = 0; /* Not supported on disk */
 829		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_SUNOS | UFS_CG_SUN;
 830		break;
 831
 832	case UFS_MOUNT_UFSTYPE_SUNx86:
 833		UFSD("ufstype=sunx86\n");
 834		uspi->s_fsize = block_size = 1024;
 835		uspi->s_fmask = ~(1024 - 1);
 836		uspi->s_fshift = 10;
 837		uspi->s_sbsize = super_block_size = 2048;
 838		uspi->s_sbbase = 0;
 839		uspi->s_maxsymlinklen = 0; /* Not supported on disk */
 840		flags |= UFS_DE_OLD | UFS_UID_EFT | UFS_ST_SUNx86 | UFS_CG_SUN;
 841		break;
 842
 843	case UFS_MOUNT_UFSTYPE_OLD:
 844		UFSD("ufstype=old\n");
 845		uspi->s_fsize = block_size = 1024;
 846		uspi->s_fmask = ~(1024 - 1);
 847		uspi->s_fshift = 10;
 848		uspi->s_sbsize = super_block_size = 2048;
 849		uspi->s_sbbase = 0;
 850		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_OLD | UFS_CG_OLD;
 851		if (!sb_rdonly(sb)) {
 852			if (!silent)
 853				pr_info("ufstype=old is supported read-only\n");
 854			sb->s_flags |= SB_RDONLY;
 855		}
 856		break;
 857	
 858	case UFS_MOUNT_UFSTYPE_NEXTSTEP:
 859		UFSD("ufstype=nextstep\n");
 860		uspi->s_fsize = block_size = 1024;
 861		uspi->s_fmask = ~(1024 - 1);
 862		uspi->s_fshift = 10;
 863		uspi->s_sbsize = super_block_size = 2048;
 864		uspi->s_sbbase = 0;
 865		uspi->s_dirblksize = 1024;
 866		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_OLD | UFS_CG_OLD;
 867		if (!sb_rdonly(sb)) {
 868			if (!silent)
 869				pr_info("ufstype=nextstep is supported read-only\n");
 870			sb->s_flags |= SB_RDONLY;
 871		}
 872		break;
 873	
 874	case UFS_MOUNT_UFSTYPE_NEXTSTEP_CD:
 875		UFSD("ufstype=nextstep-cd\n");
 876		uspi->s_fsize = block_size = 2048;
 877		uspi->s_fmask = ~(2048 - 1);
 878		uspi->s_fshift = 11;
 879		uspi->s_sbsize = super_block_size = 2048;
 880		uspi->s_sbbase = 0;
 881		uspi->s_dirblksize = 1024;
 882		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_OLD | UFS_CG_OLD;
 883		if (!sb_rdonly(sb)) {
 884			if (!silent)
 885				pr_info("ufstype=nextstep-cd is supported read-only\n");
 886			sb->s_flags |= SB_RDONLY;
 887		}
 888		break;
 889	
 890	case UFS_MOUNT_UFSTYPE_OPENSTEP:
 891		UFSD("ufstype=openstep\n");
 892		uspi->s_fsize = block_size = 1024;
 893		uspi->s_fmask = ~(1024 - 1);
 894		uspi->s_fshift = 10;
 895		uspi->s_sbsize = super_block_size = 2048;
 896		uspi->s_sbbase = 0;
 897		uspi->s_dirblksize = 1024;
 898		flags |= UFS_DE_44BSD | UFS_UID_44BSD | UFS_ST_44BSD | UFS_CG_44BSD;
 899		if (!sb_rdonly(sb)) {
 900			if (!silent)
 901				pr_info("ufstype=openstep is supported read-only\n");
 902			sb->s_flags |= SB_RDONLY;
 903		}
 904		break;
 905	
 906	case UFS_MOUNT_UFSTYPE_HP:
 907		UFSD("ufstype=hp\n");
 908		uspi->s_fsize = block_size = 1024;
 909		uspi->s_fmask = ~(1024 - 1);
 910		uspi->s_fshift = 10;
 911		uspi->s_sbsize = super_block_size = 2048;
 912		uspi->s_sbbase = 0;
 913		flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_OLD | UFS_CG_OLD;
 914		if (!sb_rdonly(sb)) {
 915			if (!silent)
 916				pr_info("ufstype=hp is supported read-only\n");
 917			sb->s_flags |= SB_RDONLY;
 918 		}
 919 		break;
 920	default:
 921		if (!silent)
 922			pr_err("unknown ufstype\n");
 923		goto failed;
 924	}
 925	
 926again:	
 927	if (!sb_set_blocksize(sb, block_size)) {
 928		pr_err("failed to set blocksize\n");
 929		goto failed;
 930	}
 931
 932	/*
 933	 * read ufs super block from device
 934	 */
 935
 936	ubh = ubh_bread_uspi(uspi, sb, uspi->s_sbbase + super_block_offset/block_size, super_block_size);
 937	
 938	if (!ubh) 
 939            goto failed;
 940
 941	usb1 = ubh_get_usb_first(uspi);
 942	usb2 = ubh_get_usb_second(uspi);
 943	usb3 = ubh_get_usb_third(uspi);
 944
 945	/* Sort out mod used on SunOS 4.1.3 for fs_state */
 946	uspi->s_postblformat = fs32_to_cpu(sb, usb3->fs_postblformat);
 947	if (((flags & UFS_ST_MASK) == UFS_ST_SUNOS) &&
 948	    (uspi->s_postblformat != UFS_42POSTBLFMT)) {
 949		flags &= ~UFS_ST_MASK;
 950		flags |=  UFS_ST_SUN;
 951	}
 952
 953	if ((flags & UFS_ST_MASK) == UFS_ST_44BSD &&
 954	    uspi->s_postblformat == UFS_42POSTBLFMT) {
 955		if (!silent)
 956			pr_err("this is not a 44bsd filesystem");
 957		goto failed;
 958	}
 959
 960	/*
 961	 * Check ufs magic number
 962	 */
 963	sbi->s_bytesex = BYTESEX_LE;
 964	switch ((uspi->fs_magic = fs32_to_cpu(sb, usb3->fs_magic))) {
 965		case UFS_MAGIC:
 966		case UFS_MAGIC_BW:
 967		case UFS2_MAGIC:
 968		case UFS_MAGIC_LFN:
 969	        case UFS_MAGIC_FEA:
 970	        case UFS_MAGIC_4GB:
 971			goto magic_found;
 972	}
 973	sbi->s_bytesex = BYTESEX_BE;
 974	switch ((uspi->fs_magic = fs32_to_cpu(sb, usb3->fs_magic))) {
 975		case UFS_MAGIC:
 976		case UFS_MAGIC_BW:
 977		case UFS2_MAGIC:
 978		case UFS_MAGIC_LFN:
 979	        case UFS_MAGIC_FEA:
 980	        case UFS_MAGIC_4GB:
 981			goto magic_found;
 982	}
 983
 984	if ((sbi->s_flavour == UFS_MOUNT_UFSTYPE_NEXTSTEP
 985	  || sbi->s_flavour == UFS_MOUNT_UFSTYPE_NEXTSTEP_CD
 986	  || sbi->s_flavour == UFS_MOUNT_UFSTYPE_OPENSTEP)
 987	  && uspi->s_sbbase < 256) {
 988		ubh_brelse_uspi(uspi);
 989		ubh = NULL;
 990		uspi->s_sbbase += 8;
 991		goto again;
 992	}
 993	if (!silent)
 994		pr_err("%s(): bad magic number\n", __func__);
 995	goto failed;
 996
 997magic_found:
 998	/*
 999	 * Check block and fragment sizes
1000	 */
1001	uspi->s_bsize = fs32_to_cpu(sb, usb1->fs_bsize);
1002	uspi->s_fsize = fs32_to_cpu(sb, usb1->fs_fsize);
1003	uspi->s_sbsize = fs32_to_cpu(sb, usb1->fs_sbsize);
1004	uspi->s_fmask = fs32_to_cpu(sb, usb1->fs_fmask);
1005	uspi->s_fshift = fs32_to_cpu(sb, usb1->fs_fshift);
1006
1007	if (!is_power_of_2(uspi->s_fsize)) {
1008		pr_err("%s(): fragment size %u is not a power of 2\n",
1009		       __func__, uspi->s_fsize);
1010		goto failed;
1011	}
1012	if (uspi->s_fsize < 512) {
1013		pr_err("%s(): fragment size %u is too small\n",
1014		       __func__, uspi->s_fsize);
1015		goto failed;
1016	}
1017	if (uspi->s_fsize > 4096) {
1018		pr_err("%s(): fragment size %u is too large\n",
1019		       __func__, uspi->s_fsize);
1020		goto failed;
1021	}
1022	if (!is_power_of_2(uspi->s_bsize)) {
1023		pr_err("%s(): block size %u is not a power of 2\n",
1024		       __func__, uspi->s_bsize);
1025		goto failed;
1026	}
1027	if (uspi->s_bsize < 4096) {
1028		pr_err("%s(): block size %u is too small\n",
1029		       __func__, uspi->s_bsize);
1030		goto failed;
1031	}
1032	if (uspi->s_bsize / uspi->s_fsize > 8) {
1033		pr_err("%s(): too many fragments per block (%u)\n",
1034		       __func__, uspi->s_bsize / uspi->s_fsize);
1035		goto failed;
1036	}
1037	if (uspi->s_fsize != block_size || uspi->s_sbsize != super_block_size) {
1038		ubh_brelse_uspi(uspi);
1039		ubh = NULL;
1040		block_size = uspi->s_fsize;
1041		super_block_size = uspi->s_sbsize;
1042		UFSD("another value of block_size or super_block_size %u, %u\n", block_size, super_block_size);
1043		goto again;
1044	}
1045
1046	sbi->s_flags = flags;/*after that line some functions use s_flags*/
1047	ufs_print_super_stuff(sb, usb1, usb2, usb3);
1048
1049	/*
1050	 * Check, if file system was correctly unmounted.
1051	 * If not, make it read only.
1052	 */
1053	if (((flags & UFS_ST_MASK) == UFS_ST_44BSD) ||
1054	  ((flags & UFS_ST_MASK) == UFS_ST_OLD) ||
1055	  (((flags & UFS_ST_MASK) == UFS_ST_SUN ||
1056	    (flags & UFS_ST_MASK) == UFS_ST_SUNOS ||
1057	  (flags & UFS_ST_MASK) == UFS_ST_SUNx86) &&
1058	  (ufs_get_fs_state(sb, usb1, usb3) == (UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time))))) {
1059		switch(usb1->fs_clean) {
1060		case UFS_FSCLEAN:
1061			UFSD("fs is clean\n");
1062			break;
1063		case UFS_FSSTABLE:
1064			UFSD("fs is stable\n");
1065			break;
1066		case UFS_FSLOG:
1067			UFSD("fs is logging fs\n");
1068			break;
1069		case UFS_FSOSF1:
1070			UFSD("fs is DEC OSF/1\n");
1071			break;
1072		case UFS_FSACTIVE:
1073			pr_err("%s(): fs is active\n", __func__);
1074			sb->s_flags |= SB_RDONLY;
1075			break;
1076		case UFS_FSBAD:
1077			pr_err("%s(): fs is bad\n", __func__);
1078			sb->s_flags |= SB_RDONLY;
1079			break;
1080		default:
1081			pr_err("%s(): can't grok fs_clean 0x%x\n",
1082			       __func__, usb1->fs_clean);
1083			sb->s_flags |= SB_RDONLY;
1084			break;
1085		}
1086	} else {
1087		pr_err("%s(): fs needs fsck\n", __func__);
1088		sb->s_flags |= SB_RDONLY;
1089	}
1090
1091	/*
1092	 * Read ufs_super_block into internal data structures
1093	 */
1094	sb->s_op = &ufs_super_ops;
1095	sb->s_export_op = &ufs_export_ops;
1096
1097	sb->s_magic = fs32_to_cpu(sb, usb3->fs_magic);
1098
1099	uspi->s_sblkno = fs32_to_cpu(sb, usb1->fs_sblkno);
1100	uspi->s_cblkno = fs32_to_cpu(sb, usb1->fs_cblkno);
1101	uspi->s_iblkno = fs32_to_cpu(sb, usb1->fs_iblkno);
1102	uspi->s_dblkno = fs32_to_cpu(sb, usb1->fs_dblkno);
1103	uspi->s_cgoffset = fs32_to_cpu(sb, usb1->fs_cgoffset);
1104	uspi->s_cgmask = fs32_to_cpu(sb, usb1->fs_cgmask);
1105
1106	if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
1107		uspi->s_size  = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_size);
1108		uspi->s_dsize = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_dsize);
1109	} else {
1110		uspi->s_size  =  fs32_to_cpu(sb, usb1->fs_size);
1111		uspi->s_dsize =  fs32_to_cpu(sb, usb1->fs_dsize);
1112	}
1113
1114	uspi->s_ncg = fs32_to_cpu(sb, usb1->fs_ncg);
1115	/* s_bsize already set */
1116	/* s_fsize already set */
1117	uspi->s_fpb = fs32_to_cpu(sb, usb1->fs_frag);
1118	uspi->s_minfree = fs32_to_cpu(sb, usb1->fs_minfree);
1119	uspi->s_bmask = fs32_to_cpu(sb, usb1->fs_bmask);
1120	uspi->s_fmask = fs32_to_cpu(sb, usb1->fs_fmask);
1121	uspi->s_bshift = fs32_to_cpu(sb, usb1->fs_bshift);
1122	uspi->s_fshift = fs32_to_cpu(sb, usb1->fs_fshift);
1123	UFSD("uspi->s_bshift = %d,uspi->s_fshift = %d", uspi->s_bshift,
1124		uspi->s_fshift);
1125	uspi->s_fpbshift = fs32_to_cpu(sb, usb1->fs_fragshift);
1126	uspi->s_fsbtodb = fs32_to_cpu(sb, usb1->fs_fsbtodb);
1127	/* s_sbsize already set */
1128	uspi->s_csmask = fs32_to_cpu(sb, usb1->fs_csmask);
1129	uspi->s_csshift = fs32_to_cpu(sb, usb1->fs_csshift);
1130	uspi->s_nindir = fs32_to_cpu(sb, usb1->fs_nindir);
1131	uspi->s_inopb = fs32_to_cpu(sb, usb1->fs_inopb);
1132	uspi->s_nspf = fs32_to_cpu(sb, usb1->fs_nspf);
1133	uspi->s_npsect = ufs_get_fs_npsect(sb, usb1, usb3);
1134	uspi->s_interleave = fs32_to_cpu(sb, usb1->fs_interleave);
1135	uspi->s_trackskew = fs32_to_cpu(sb, usb1->fs_trackskew);
1136
1137	if (uspi->fs_magic == UFS2_MAGIC)
1138		uspi->s_csaddr = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_csaddr);
1139	else
1140		uspi->s_csaddr = fs32_to_cpu(sb, usb1->fs_csaddr);
1141
1142	uspi->s_cssize = fs32_to_cpu(sb, usb1->fs_cssize);
1143	uspi->s_cgsize = fs32_to_cpu(sb, usb1->fs_cgsize);
1144	uspi->s_ntrak = fs32_to_cpu(sb, usb1->fs_ntrak);
1145	uspi->s_nsect = fs32_to_cpu(sb, usb1->fs_nsect);
1146	uspi->s_spc = fs32_to_cpu(sb, usb1->fs_spc);
1147	uspi->s_ipg = fs32_to_cpu(sb, usb1->fs_ipg);
1148	uspi->s_fpg = fs32_to_cpu(sb, usb1->fs_fpg);
1149	uspi->s_cpc = fs32_to_cpu(sb, usb2->fs_un.fs_u1.fs_cpc);
1150	uspi->s_contigsumsize = fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_contigsumsize);
1151	uspi->s_qbmask = ufs_get_fs_qbmask(sb, usb3);
1152	uspi->s_qfmask = ufs_get_fs_qfmask(sb, usb3);
1153	uspi->s_nrpos = fs32_to_cpu(sb, usb3->fs_nrpos);
1154	uspi->s_postbloff = fs32_to_cpu(sb, usb3->fs_postbloff);
1155	uspi->s_rotbloff = fs32_to_cpu(sb, usb3->fs_rotbloff);
1156
1157	uspi->s_root_blocks = mul_u64_u32_div(uspi->s_dsize,
1158					      uspi->s_minfree, 100);
1159	if (uspi->s_minfree <= 5) {
1160		uspi->s_time_to_space = ~0ULL;
1161		uspi->s_space_to_time = 0;
1162		usb1->fs_optim = cpu_to_fs32(sb, UFS_OPTSPACE);
1163	} else {
1164		uspi->s_time_to_space = (uspi->s_root_blocks / 2) + 1;
1165		uspi->s_space_to_time = mul_u64_u32_div(uspi->s_dsize,
1166					      uspi->s_minfree - 2, 100) - 1;
1167	}
1168
1169	/*
1170	 * Compute another frequently used values
1171	 */
1172	uspi->s_fpbmask = uspi->s_fpb - 1;
1173	if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
1174		uspi->s_apbshift = uspi->s_bshift - 3;
1175	else
1176		uspi->s_apbshift = uspi->s_bshift - 2;
1177
1178	uspi->s_apb = 1 << uspi->s_apbshift;
1179	uspi->s_apbmask = uspi->s_apb - 1;
1180	uspi->s_nspfshift = uspi->s_fshift - UFS_SECTOR_BITS;
1181	uspi->s_nspb = uspi->s_nspf << uspi->s_fpbshift;
1182	uspi->s_inopf = uspi->s_inopb >> uspi->s_fpbshift;
1183	uspi->s_bpf = uspi->s_fsize << 3;
1184	uspi->s_bpfshift = uspi->s_fshift + 3;
1185	uspi->s_bpfmask = uspi->s_bpf - 1;
1186	if (sbi->s_flavour == UFS_MOUNT_UFSTYPE_44BSD ||
1187	    sbi->s_flavour == UFS_MOUNT_UFSTYPE_UFS2)
1188		uspi->s_maxsymlinklen =
1189		    fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_maxsymlinklen);
1190
1191	if (uspi->fs_magic == UFS2_MAGIC)
1192		maxsymlen = 2 * 4 * (UFS_NDADDR + UFS_NINDIR);
1193	else
1194		maxsymlen = 4 * (UFS_NDADDR + UFS_NINDIR);
1195	if (uspi->s_maxsymlinklen > maxsymlen) {
1196		ufs_warning(sb, __func__, "ufs_read_super: excessive maximum "
1197			    "fast symlink size (%u)\n", uspi->s_maxsymlinklen);
1198		uspi->s_maxsymlinklen = maxsymlen;
1199	}
1200	sb->s_maxbytes = ufs_max_bytes(sb);
1201	sb->s_max_links = UFS_LINK_MAX;
1202
1203	inode = ufs_iget(sb, UFS_ROOTINO);
1204	if (IS_ERR(inode)) {
1205		ret = PTR_ERR(inode);
1206		goto failed;
1207	}
1208	sb->s_root = d_make_root(inode);
1209	if (!sb->s_root) {
1210		ret = -ENOMEM;
1211		goto failed;
1212	}
1213
1214	ufs_setup_cstotal(sb);
1215	/*
1216	 * Read cylinder group structures
1217	 */
1218	if (!sb_rdonly(sb))
1219		if (!ufs_read_cylinder_structures(sb))
1220			goto failed;
1221
1222	UFSD("EXIT\n");
1223	return 0;
1224
1225failed:
1226	if (ubh)
1227		ubh_brelse_uspi (uspi);
1228	kfree (uspi);
1229	kfree(sbi);
1230	sb->s_fs_info = NULL;
1231	UFSD("EXIT (FAILED)\n");
1232	return ret;
1233
1234failed_nomem:
1235	UFSD("EXIT (NOMEM)\n");
1236	return -ENOMEM;
1237}
1238
1239static int ufs_reconfigure(struct fs_context *fc)
1240{
1241	struct ufs_sb_private_info * uspi;
1242	struct ufs_super_block_first * usb1;
1243	struct ufs_super_block_third * usb3;
1244	struct ufs_fs_context *ctx = fc->fs_private;
1245	struct super_block *sb = fc->root->d_sb;
1246	unsigned int ufstype;
1247	unsigned int flags;
1248
1249	sync_filesystem(sb);
1250	mutex_lock(&UFS_SB(sb)->s_lock);
1251	uspi = UFS_SB(sb)->s_uspi;
1252	flags = UFS_SB(sb)->s_flags;
1253	usb1 = ubh_get_usb_first(uspi);
1254	usb3 = ubh_get_usb_third(uspi);
1255	
1256	ufstype = UFS_SB(sb)->s_flavour;
1257
1258	if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb)) {
1259		UFS_SB(sb)->s_on_err = ctx->on_err;
1260		mutex_unlock(&UFS_SB(sb)->s_lock);
1261		return 0;
1262	}
1263	
1264	/*
1265	 * fs was mouted as rw, remounting ro
1266	 */
1267	if (fc->sb_flags & SB_RDONLY) {
1268		ufs_put_super_internal(sb);
1269		usb1->fs_time = ufs_get_seconds(sb);
1270		if ((flags & UFS_ST_MASK) == UFS_ST_SUN
1271		  || (flags & UFS_ST_MASK) == UFS_ST_SUNOS
1272		  || (flags & UFS_ST_MASK) == UFS_ST_SUNx86) 
1273			ufs_set_fs_state(sb, usb1, usb3,
1274				UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time));
1275		ubh_mark_buffer_dirty (USPI_UBH(uspi));
1276		sb->s_flags |= SB_RDONLY;
1277	} else {
1278	/*
1279	 * fs was mounted as ro, remounting rw
1280	 */
1281#ifndef CONFIG_UFS_FS_WRITE
1282		pr_err("ufs was compiled with read-only support, can't be mounted as read-write\n");
1283		mutex_unlock(&UFS_SB(sb)->s_lock);
1284		return -EINVAL;
1285#else
1286		if (ufstype != UFS_MOUNT_UFSTYPE_SUN && 
1287		    ufstype != UFS_MOUNT_UFSTYPE_SUNOS &&
1288		    ufstype != UFS_MOUNT_UFSTYPE_44BSD &&
1289		    ufstype != UFS_MOUNT_UFSTYPE_SUNx86 &&
1290		    ufstype != UFS_MOUNT_UFSTYPE_UFS2) {
1291			pr_err("this ufstype is read-only supported\n");
1292			mutex_unlock(&UFS_SB(sb)->s_lock);
1293			return -EINVAL;
1294		}
1295		if (!ufs_read_cylinder_structures(sb)) {
1296			pr_err("failed during remounting\n");
1297			mutex_unlock(&UFS_SB(sb)->s_lock);
1298			return -EPERM;
1299		}
1300		sb->s_flags &= ~SB_RDONLY;
1301#endif
1302	}
1303	UFS_SB(sb)->s_on_err = ctx->on_err;
1304	mutex_unlock(&UFS_SB(sb)->s_lock);
1305	return 0;
1306}
1307
1308static int ufs_show_options(struct seq_file *seq, struct dentry *root)
1309{
1310	struct ufs_sb_info *sbi = UFS_SB(root->d_sb);
1311	unsigned mval = sbi->s_flavour;
1312	const struct constant_table *tp;
1313
1314	tp = ufs_param_ufstype;
1315	while (tp->value && tp->value != mval)
1316		++tp;
1317	seq_printf(seq, ",ufstype=%s", tp->name);
1318
1319	tp = ufs_param_onerror;
1320	mval = sbi->s_on_err;
1321	while (tp->value && tp->value != mval)
1322		++tp;
1323	seq_printf(seq, ",onerror=%s", tp->name);
1324
1325	return 0;
1326}
1327
1328static int ufs_statfs(struct dentry *dentry, struct kstatfs *buf)
1329{
1330	struct super_block *sb = dentry->d_sb;
1331	struct ufs_sb_private_info *uspi= UFS_SB(sb)->s_uspi;
1332	unsigned  flags = UFS_SB(sb)->s_flags;
1333	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
1334
1335	mutex_lock(&UFS_SB(sb)->s_lock);
1336	
1337	if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2)
1338		buf->f_type = UFS2_MAGIC;
1339	else
1340		buf->f_type = UFS_MAGIC;
1341
1342	buf->f_blocks = uspi->s_dsize;
1343	buf->f_bfree = ufs_freefrags(uspi);
1344	buf->f_ffree = uspi->cs_total.cs_nifree;
1345	buf->f_bsize = sb->s_blocksize;
1346	buf->f_bavail = (buf->f_bfree > uspi->s_root_blocks)
1347		? (buf->f_bfree - uspi->s_root_blocks) : 0;
1348	buf->f_files = uspi->s_ncg * uspi->s_ipg;
1349	buf->f_namelen = UFS_MAXNAMLEN;
1350	buf->f_fsid = u64_to_fsid(id);
1351
1352	mutex_unlock(&UFS_SB(sb)->s_lock);
1353
1354	return 0;
1355}
1356
1357static struct kmem_cache * ufs_inode_cachep;
1358
1359static struct inode *ufs_alloc_inode(struct super_block *sb)
1360{
1361	struct ufs_inode_info *ei;
1362
1363	ei = alloc_inode_sb(sb, ufs_inode_cachep, GFP_NOFS);
1364	if (!ei)
1365		return NULL;
1366
1367	inode_set_iversion(&ei->vfs_inode, 1);
1368	seqlock_init(&ei->meta_lock);
1369	mutex_init(&ei->truncate_mutex);
1370	return &ei->vfs_inode;
1371}
1372
1373static void ufs_free_in_core_inode(struct inode *inode)
1374{
1375	kmem_cache_free(ufs_inode_cachep, UFS_I(inode));
1376}
1377
1378static void init_once(void *foo)
1379{
1380	struct ufs_inode_info *ei = (struct ufs_inode_info *) foo;
1381
1382	inode_init_once(&ei->vfs_inode);
1383}
1384
1385static int __init init_inodecache(void)
1386{
1387	ufs_inode_cachep = kmem_cache_create_usercopy("ufs_inode_cache",
1388				sizeof(struct ufs_inode_info), 0,
1389				(SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT),
1390				offsetof(struct ufs_inode_info, i_u1.i_symlink),
1391				sizeof_field(struct ufs_inode_info,
1392					i_u1.i_symlink),
1393				init_once);
1394	if (ufs_inode_cachep == NULL)
1395		return -ENOMEM;
1396	return 0;
1397}
1398
1399static void destroy_inodecache(void)
1400{
1401	/*
1402	 * Make sure all delayed rcu free inodes are flushed before we
1403	 * destroy cache.
1404	 */
1405	rcu_barrier();
1406	kmem_cache_destroy(ufs_inode_cachep);
1407}
1408
1409static const struct super_operations ufs_super_ops = {
1410	.alloc_inode	= ufs_alloc_inode,
1411	.free_inode	= ufs_free_in_core_inode,
1412	.write_inode	= ufs_write_inode,
1413	.evict_inode	= ufs_evict_inode,
1414	.put_super	= ufs_put_super,
1415	.sync_fs	= ufs_sync_fs,
1416	.statfs		= ufs_statfs,
1417	.show_options   = ufs_show_options,
1418};
1419
1420static int ufs_get_tree(struct fs_context *fc)
1421{
1422	return get_tree_bdev(fc, ufs_fill_super);
1423}
1424
1425static void ufs_free_fc(struct fs_context *fc)
1426{
1427	kfree(fc->fs_private);
1428}
1429
1430static const struct fs_context_operations ufs_context_ops = {
1431	.parse_param	= ufs_parse_param,
1432	.get_tree	= ufs_get_tree,
1433	.reconfigure	= ufs_reconfigure,
1434	.free		= ufs_free_fc,
1435};
1436
1437static int ufs_init_fs_context(struct fs_context *fc)
1438{
1439	struct ufs_fs_context *ctx;
1440
1441	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
1442	if (!ctx)
1443		return -ENOMEM;
1444
1445	if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1446		struct super_block *sb = fc->root->d_sb;
1447		struct ufs_sb_info *sbi = UFS_SB(sb);
1448
1449		ctx->flavour = sbi->s_flavour;
1450		ctx->on_err = sbi->s_on_err;
1451	} else {
1452		ctx->flavour = 0;
1453		ctx->on_err = UFS_MOUNT_ONERROR_LOCK;
1454	}
1455
1456	fc->fs_private = ctx;
1457	fc->ops = &ufs_context_ops;
1458
1459	return 0;
1460}
1461
1462static struct file_system_type ufs_fs_type = {
1463	.owner		= THIS_MODULE,
1464	.name		= "ufs",
1465	.kill_sb	= kill_block_super,
1466	.init_fs_context = ufs_init_fs_context,
1467	.parameters	= ufs_param_spec,
1468	.fs_flags	= FS_REQUIRES_DEV,
1469};
1470MODULE_ALIAS_FS("ufs");
1471
1472static int __init init_ufs_fs(void)
1473{
1474	int err = init_inodecache();
1475	if (err)
1476		goto out1;
1477	err = register_filesystem(&ufs_fs_type);
1478	if (err)
1479		goto out;
1480	return 0;
1481out:
1482	destroy_inodecache();
1483out1:
1484	return err;
1485}
1486
1487static void __exit exit_ufs_fs(void)
1488{
1489	unregister_filesystem(&ufs_fs_type);
1490	destroy_inodecache();
1491}
1492
1493module_init(init_ufs_fs)
1494module_exit(exit_ufs_fs)
1495MODULE_DESCRIPTION("UFS Filesystem");
1496MODULE_LICENSE("GPL");