super.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 1,249 行 · 第 1/3 页

/*
 *  linux/fs/ufs/super.c
 *
 * Copyright (C) 1998
 * Daniel Pirkl <[e-mail]>
 * Charles University, Faculty of Mathematics and Physics
 */

/* Derived from
 *
 *  linux/fs/ext2/super.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card ([e-mail])
 * 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 ([e-mail]), 1995
 */
 
/*
 * Inspired by
 *
 *  linux/fs/ufs/super.c
 *
 * Copyright (C) 1996
 * Adrian Rodriguez ([e-mail])
 * Laboratory for Computer Science Research Computing Facility
 * Rutgers, The State University of New Jersey
 *
 * Copyright (C) 1996  Eddie C. Dost  ([e-mail])
 *
 * Kernel module support added on 96/04/26 by
 * Stefan Reinauer <[e-mail]>
 *
 * Module usage counts added on 96/04/29 by
 * Gertjan van Wingerde <[e-mail]>
 *
 * Clean swab support on 19970406 by
 * Francois-Rene Rideau <[e-mail]>
 *
 * 4.4BSD (FreeBSD) support added on February 1st 1998 by
 * Niels Kristian Bech Jensen <[e-mail]> partially based
 * on code by Martin von Loewis <[e-mail]>.
 *
 * NeXTstep support added on February 5th 1998 by
 * Niels Kristian Bech Jensen <[e-mail]>.
 *
 * write support Daniel Pirkl <[e-mail]> 1998
 * 
 * HP/UX hfs filesystem support added by
 * Martin K. Petersen <[e-mail]>, August 1999
 *
 * UFS2 (of FreeBSD 5.x) support added by
 * Niraj Kumar <[e-mail]>, Jan 2004
 *
 */


#include <linux/config.h>
#include <linux/module.h>

#include <stdarg.h>

#include <asm/bitops.h>
#include <asm/uaccess.h>
#include <asm/system.h>

#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/ufs_fs.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/blkdev.h>
#include <linux/init.h>
#include <linux/parser.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include <linux/vfs.h>

#include "swab.h"
#include "util.h"

#undef UFS_SUPER_DEBUG
#undef UFS_SUPER_DEBUG_MORE


#undef UFS_SUPER_DEBUG_MORE
#ifdef UFS_SUPER_DEBUG
#define UFSD(x) printk("(%s, %d), %s: ", __FILE__, __LINE__, __FUNCTION__); printk x;
#else
#define UFSD(x)
#endif

#ifdef UFS_SUPER_DEBUG_MORE
/*
 * Print contents of ufs_super_block, useful for debugging
 */
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)
{
	printk("ufs_print_super_stuff\n");
	printk("size of usb:     %u\n", sizeof(struct ufs_super_block));
	printk("  magic:         0x%x\n", fs32_to_cpu(sb, usb3->fs_magic));
	printk("  sblkno:        %u\n", fs32_to_cpu(sb, usb1->fs_sblkno));
	printk("  cblkno:        %u\n", fs32_to_cpu(sb, usb1->fs_cblkno));
	printk("  iblkno:        %u\n", fs32_to_cpu(sb, usb1->fs_iblkno));
	printk("  dblkno:        %u\n", fs32_to_cpu(sb, usb1->fs_dblkno));
	printk("  cgoffset:      %u\n", fs32_to_cpu(sb, usb1->fs_cgoffset));
	printk("  ~cgmask:       0x%x\n", ~fs32_to_cpu(sb, usb1->fs_cgmask));
	printk("  size:          %u\n", fs32_to_cpu(sb, usb1->fs_size));
	printk("  dsize:         %u\n", fs32_to_cpu(sb, usb1->fs_dsize));
	printk("  ncg:           %u\n", fs32_to_cpu(sb, usb1->fs_ncg));
	printk("  bsize:         %u\n", fs32_to_cpu(sb, usb1->fs_bsize));
	printk("  fsize:         %u\n", fs32_to_cpu(sb, usb1->fs_fsize));
	printk("  frag:          %u\n", fs32_to_cpu(sb, usb1->fs_frag));
	printk("  fragshift:     %u\n", fs32_to_cpu(sb, usb1->fs_fragshift));
	printk("  ~fmask:        %u\n", ~fs32_to_cpu(sb, usb1->fs_fmask));
	printk("  fshift:        %u\n", fs32_to_cpu(sb, usb1->fs_fshift));
	printk("  sbsize:        %u\n", fs32_to_cpu(sb, usb1->fs_sbsize));
	printk("  spc:           %u\n", fs32_to_cpu(sb, usb1->fs_spc));
	printk("  cpg:           %u\n", fs32_to_cpu(sb, usb1->fs_cpg));
	printk("  ipg:           %u\n", fs32_to_cpu(sb, usb1->fs_ipg));
	printk("  fpg:           %u\n", fs32_to_cpu(sb, usb1->fs_fpg));
	printk("  csaddr:        %u\n", fs32_to_cpu(sb, usb1->fs_csaddr));
	printk("  cssize:        %u\n", fs32_to_cpu(sb, usb1->fs_cssize));
	printk("  cgsize:        %u\n", fs32_to_cpu(sb, usb1->fs_cgsize));
	printk("  fstodb:        %u\n", fs32_to_cpu(sb, usb1->fs_fsbtodb));
	printk("  contigsumsize: %d\n", fs32_to_cpu(sb, usb3->fs_u2.fs_44.fs_contigsumsize));
	printk("  postblformat:  %u\n", fs32_to_cpu(sb, usb3->fs_postblformat));
	printk("  nrpos:         %u\n", fs32_to_cpu(sb, usb3->fs_nrpos));
	printk("  ndir           %u\n", fs32_to_cpu(sb, usb1->fs_cstotal.cs_ndir));
	printk("  nifree         %u\n", fs32_to_cpu(sb, usb1->fs_cstotal.cs_nifree));
	printk("  nbfree         %u\n", fs32_to_cpu(sb, usb1->fs_cstotal.cs_nbfree));
	printk("  nffree         %u\n", fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree));
	printk("\n");
}

/*
 * Print contents of ufs2 ufs_super_block, useful for debugging
 */
void ufs2_print_super_stuff(
     struct super_block *sb,
      struct ufs_super_block *usb)
{
	printk("ufs_print_super_stuff\n");
	printk("size of usb:     %u\n", sizeof(struct ufs_super_block));
	printk("  magic:         0x%x\n", fs32_to_cpu(sb, usb->fs_magic));
	printk("  fs_size:   %u\n",fs64_to_cpu(sb, usb->fs_u11.fs_u2.fs_size));
	printk("  fs_dsize:  %u\n",fs64_to_cpu(sb, usb->fs_u11.fs_u2.fs_dsize));
	printk("  bsize:         %u\n", fs32_to_cpu(usb, usb->fs_bsize));
	printk("  fsize:         %u\n", fs32_to_cpu(usb, usb->fs_fsize));
	printk("  fs_volname:  %s\n", usb->fs_u11.fs_u2.fs_volname);
	printk("  fs_fsmnt:  %s\n", usb->fs_u11.fs_u2.fs_fsmnt);
	printk("  fs_sblockloc: %u\n",fs64_to_cpu(sb,
			usb->fs_u11.fs_u2.fs_sblockloc));
	printk("  cs_ndir(No of dirs):  %u\n",fs64_to_cpu(sb,
			usb->fs_u11.fs_u2.fs_cstotal.cs_ndir));
	printk("  cs_nbfree(No of free blocks):  %u\n",fs64_to_cpu(sb,
			usb->fs_u11.fs_u2.fs_cstotal.cs_nbfree));
	printk("\n");
}

/*
 * Print contents of ufs_cylinder_group, useful for debugging
 */
void ufs_print_cylinder_stuff(struct super_block *sb, struct ufs_cylinder_group *cg)
{
	printk("\nufs_print_cylinder_stuff\n");
	printk("size of ucg: %u\n", sizeof(struct ufs_cylinder_group));
	printk("  magic:        %x\n", fs32_to_cpu(sb, cg->cg_magic));
	printk("  time:         %u\n", fs32_to_cpu(sb, cg->cg_time));
	printk("  cgx:          %u\n", fs32_to_cpu(sb, cg->cg_cgx));
	printk("  ncyl:         %u\n", fs16_to_cpu(sb, cg->cg_ncyl));
	printk("  niblk:        %u\n", fs16_to_cpu(sb, cg->cg_niblk));
	printk("  ndblk:        %u\n", fs32_to_cpu(sb, cg->cg_ndblk));
	printk("  cs_ndir:      %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_ndir));
	printk("  cs_nbfree:    %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_nbfree));
	printk("  cs_nifree:    %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_nifree));
	printk("  cs_nffree:    %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_nffree));
	printk("  rotor:        %u\n", fs32_to_cpu(sb, cg->cg_rotor));
	printk("  frotor:       %u\n", fs32_to_cpu(sb, cg->cg_frotor));
	printk("  irotor:       %u\n", fs32_to_cpu(sb, cg->cg_irotor));
	printk("  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]));
	printk("  btotoff:      %u\n", fs32_to_cpu(sb, cg->cg_btotoff));
	printk("  boff:         %u\n", fs32_to_cpu(sb, cg->cg_boff));
	printk("  iuseoff:      %u\n", fs32_to_cpu(sb, cg->cg_iusedoff));
	printk("  freeoff:      %u\n", fs32_to_cpu(sb, cg->cg_freeoff));
	printk("  nextfreeoff:  %u\n", fs32_to_cpu(sb, cg->cg_nextfreeoff));
	printk("  clustersumoff %u\n", fs32_to_cpu(sb, cg->cg_u.cg_44.cg_clustersumoff));
	printk("  clusteroff    %u\n", fs32_to_cpu(sb, cg->cg_u.cg_44.cg_clusteroff));
	printk("  nclusterblks  %u\n", fs32_to_cpu(sb, cg->cg_u.cg_44.cg_nclusterblks));
	printk("\n");
}
#endif /* UFS_SUPER_DEBUG_MORE */

static struct super_operations ufs_super_ops;

static char error_buf[1024];

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;
	va_list args;

	uspi = UFS_SB(sb)->s_uspi;
	usb1 = ubh_get_usb_first(USPI_UBH);
	
	if (!(sb->s_flags & MS_RDONLY)) {
		usb1->fs_clean = UFS_FSBAD;
		ubh_mark_buffer_dirty(USPI_UBH);
		sb->s_dirt = 1;
		sb->s_flags |= MS_RDONLY;
	}
	va_start (args, fmt);
	vsprintf (error_buf, fmt, args);
	va_end (args);
	switch (UFS_SB(sb)->s_mount_opt & UFS_MOUNT_ONERROR) {
	case UFS_MOUNT_ONERROR_PANIC:
		panic ("UFS-fs panic (device %s): %s: %s\n", 
			sb->s_id, function, error_buf);

	case UFS_MOUNT_ONERROR_LOCK:
	case UFS_MOUNT_ONERROR_UMOUNT:
	case UFS_MOUNT_ONERROR_REPAIR:
		printk (KERN_CRIT "UFS-fs error (device %s): %s: %s\n",
			sb->s_id, function, error_buf);
	}		
}

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;
	va_list args;
	
	uspi = UFS_SB(sb)->s_uspi;
	usb1 = ubh_get_usb_first(USPI_UBH);
	
	if (!(sb->s_flags & MS_RDONLY)) {
		usb1->fs_clean = UFS_FSBAD;
		ubh_mark_buffer_dirty(USPI_UBH);
		sb->s_dirt = 1;
	}
	va_start (args, fmt);
	vsprintf (error_buf, fmt, args);
	va_end (args);
	sb->s_flags |= MS_RDONLY;
	printk (KERN_CRIT "UFS-fs panic (device %s): %s: %s\n",
		sb->s_id, function, error_buf);
}

void ufs_warning (struct super_block * sb, const char * function,
	const char * fmt, ...)
{
	va_list args;

	va_start (args, fmt);
	vsprintf (error_buf, fmt, args);
	va_end (args);
	printk (KERN_WARNING "UFS-fs warning (device %s): %s: %s\n",
		sb->s_id, function, error_buf);
}

enum {
	Opt_type_old, Opt_type_sunx86, Opt_type_sun, Opt_type_44bsd,
	Opt_type_ufs2, Opt_type_hp, Opt_type_nextstepcd, Opt_type_nextstep,
	Opt_type_openstep, Opt_onerror_panic, Opt_onerror_lock,
	Opt_onerror_umount, Opt_onerror_repair, Opt_err
};

static match_table_t tokens = {
	{Opt_type_old, "ufstype=old"},
	{Opt_type_sunx86, "ufstype=sunx86"},
	{Opt_type_sun, "ufstype=sun"},
	{Opt_type_44bsd, "ufstype=44bsd"},
	{Opt_type_ufs2, "ufstype=ufs2"},
	{Opt_type_ufs2, "ufstype=5xbsd"},
	{Opt_type_hp, "ufstype=hp"},
	{Opt_type_nextstepcd, "ufstype=nextstep-cd"},
	{Opt_type_nextstep, "ufstype=nextstep"},
	{Opt_type_openstep, "ufstype=openstep"},
	{Opt_onerror_panic, "onerror=panic"},
	{Opt_onerror_lock, "onerror=lock"},
	{Opt_onerror_umount, "onerror=umount"},
	{Opt_onerror_repair, "onerror=repair"},
	{Opt_err, NULL}
};

static int ufs_parse_options (char * options, unsigned * mount_options)
{
	char * p;
	
	UFSD(("ENTER\n"))
	
	if (!options)
		return 1;

	while ((p = strsep(&options, ",")) != NULL) {
		substring_t args[MAX_OPT_ARGS];
		int token;
		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_type_old:
			ufs_clear_opt (*mount_options, UFSTYPE);
			ufs_set_opt (*mount_options, UFSTYPE_OLD);
			break;
		case Opt_type_sunx86:
			ufs_clear_opt (*mount_options, UFSTYPE);
			ufs_set_opt (*mount_options, UFSTYPE_SUNx86);
			break;
		case Opt_type_sun:
			ufs_clear_opt (*mount_options, UFSTYPE);
			ufs_set_opt (*mount_options, UFSTYPE_SUN);
			break;
		case Opt_type_44bsd:
			ufs_clear_opt (*mount_options, UFSTYPE);
			ufs_set_opt (*mount_options, UFSTYPE_44BSD);
			break;
		case Opt_type_ufs2:
			ufs_clear_opt(*mount_options, UFSTYPE);
			ufs_set_opt(*mount_options, UFSTYPE_UFS2);
			break;
		case Opt_type_hp:
			ufs_clear_opt (*mount_options, UFSTYPE);
			ufs_set_opt (*mount_options, UFSTYPE_HP);
			break;
		case Opt_type_nextstepcd:
			ufs_clear_opt (*mount_options, UFSTYPE);
			ufs_set_opt (*mount_options, UFSTYPE_NEXTSTEP_CD);
			break;
		case Opt_type_nextstep:
			ufs_clear_opt (*mount_options, UFSTYPE);
			ufs_set_opt (*mount_options, UFSTYPE_NEXTSTEP);
			break;
		case Opt_type_openstep:
			ufs_clear_opt (*mount_options, UFSTYPE);
			ufs_set_opt (*mount_options, UFSTYPE_OPENSTEP);
			break;
		case Opt_onerror_panic:
			ufs_clear_opt (*mount_options, ONERROR);
			ufs_set_opt (*mount_options, ONERROR_PANIC);
			break;
		case Opt_onerror_lock:
			ufs_clear_opt (*mount_options, ONERROR);
			ufs_set_opt (*mount_options, ONERROR_LOCK);
			break;
		case Opt_onerror_umount:
			ufs_clear_opt (*mount_options, ONERROR);
			ufs_set_opt (*mount_options, ONERROR_UMOUNT);
			break;
		case Opt_onerror_repair:
			printk("UFS-fs: Unable to do repair on error, "
				"will lock lock instead\n");
			ufs_clear_opt (*mount_options, ONERROR);
			ufs_set_opt (*mount_options, ONERROR_REPAIR);
			break;
		default:
			printk("UFS-fs: Invalid option: \"%s\" "
					"or missing value\n", p);
			return 0;
		}
	}
	return 1;
}

/*
 * 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;
	struct ufs_super_block *usb;
	struct ufs_buffer_head * ubh;
	unsigned char * base, * space;
	unsigned size, blks, i;
	unsigned flags = 0;
	
	UFSD(("ENTER\n"))
	
	uspi = sbi->s_uspi;

	usb  = (struct ufs_super_block *)
		((struct ufs_buffer_head *)uspi)->bh[0]->b_data;

        flags = UFS_SB(sb)->s_flags;
	
	/*
	 * 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_KERNEL);
	if (!base)
		goto failed;