e2fsck.c

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			/*
			 * Need a full fsck if we are releasing a
			 * journal stored on a reserved inode.
			 */
			force_fsck = recover ||
				(sb->s_journal_inum < EXT2_FIRST_INODE(sb));
			/* Clear all of the journal fields */
			sb->s_journal_inum = 0;
			sb->s_journal_dev = 0;
			memset(sb->s_journal_uuid, 0,
			       sizeof(sb->s_journal_uuid));
			e2fsck_clear_recover(ctx, force_fsck);
		} else if (!(ctx->options & E2F_OPT_READONLY)) {
			sb->s_feature_compat |= EXT3_FEATURE_COMPAT_HAS_JOURNAL;
			ext2fs_mark_super_dirty(ctx->fs);
		}
	}

	if (sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL &&
	    !(sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER) &&
	    journal->j_superblock->s_start != 0) {
		/* Print status information */
		fix_problem(ctx, PR_0_JOURNAL_RECOVERY_CLEAR, &pctx);
		if (ctx->superblock)
			problem = PR_0_JOURNAL_RUN_DEFAULT;
		else
			problem = PR_0_JOURNAL_RUN;
		if (fix_problem(ctx, problem, &pctx)) {
			ctx->options |= E2F_OPT_FORCE;
			sb->s_feature_incompat |=
				EXT3_FEATURE_INCOMPAT_RECOVER;
			ext2fs_mark_super_dirty(ctx->fs);
		} else if (fix_problem(ctx,
				       PR_0_JOURNAL_RESET_JOURNAL, &pctx)) {
			reset = 1;
			sb->s_state &= ~EXT2_VALID_FS;
			ext2fs_mark_super_dirty(ctx->fs);
		}
		/*
		 * If the user answers no to the above question, we
		 * ignore the fact that journal apparently has data;
		 * accidentally replaying over valid data would be far
		 * worse than skipping a questionable recovery.
		 *
		 * XXX should we abort with a fatal error here?  What
		 * will the ext3 kernel code do if a filesystem with
		 * !NEEDS_RECOVERY but with a non-zero
		 * journal->j_superblock->s_start is mounted?
		 */
	}

	e2fsck_journal_release(ctx, journal, reset, 0);
	return retval;
}

static errcode_t recover_ext3_journal(e2fsck_t ctx)
{
	journal_t *journal;
	int retval;

	journal_init_revoke_caches();
	retval = e2fsck_get_journal(ctx, &journal);
	if (retval)
		return retval;

	retval = e2fsck_journal_load(journal);
	if (retval)
		goto errout;

	retval = journal_init_revoke(journal, 1024);
	if (retval)
		goto errout;

	retval = -journal_recover(journal);
	if (retval)
		goto errout;

	if (journal->j_superblock->s_errno) {
		ctx->fs->super->s_state |= EXT2_ERROR_FS;
		ext2fs_mark_super_dirty(ctx->fs);
		journal->j_superblock->s_errno = 0;
		mark_buffer_dirty(journal->j_sb_buffer);
	}

errout:
	journal_destroy_revoke(journal);
	journal_destroy_revoke_caches();
	e2fsck_journal_release(ctx, journal, 1, 0);
	return retval;
}

static int e2fsck_run_ext3_journal(e2fsck_t ctx)
{
	io_manager io_ptr = ctx->fs->io->manager;
	int blocksize = ctx->fs->blocksize;
	errcode_t       retval, recover_retval;

	printf(_("%s: recovering journal\n"), ctx->device_name);
	if (ctx->options & E2F_OPT_READONLY) {
		printf(_("%s: won't do journal recovery while read-only\n"),
		       ctx->device_name);
		return EXT2_ET_FILE_RO;
	}

	if (ctx->fs->flags & EXT2_FLAG_DIRTY)
		ext2fs_flush(ctx->fs);  /* Force out any modifications */

	recover_retval = recover_ext3_journal(ctx);

	/*
	 * Reload the filesystem context to get up-to-date data from disk
	 * because journal recovery will change the filesystem under us.
	 */
	ext2fs_close(ctx->fs);
	retval = ext2fs_open(ctx->filesystem_name, EXT2_FLAG_RW,
			     ctx->superblock, blocksize, io_ptr,
			     &ctx->fs);

	if (retval) {
		bb_error_msg(_("while trying to re-open %s"),
			ctx->device_name);
		bb_error_msg_and_die(0);
	}
	ctx->fs->priv_data = ctx;

	/* Set the superblock flags */
	e2fsck_clear_recover(ctx, recover_retval);
	return recover_retval;
}

/*
 * This function will move the journal inode from a visible file in
 * the filesystem directory hierarchy to the reserved inode if necessary.
 */
static const char *const journal_names[] = {
	".journal", "journal", ".journal.dat", "journal.dat", 0 };

static void e2fsck_move_ext3_journal(e2fsck_t ctx)
{
	struct ext2_super_block *sb = ctx->fs->super;
	struct problem_context  pctx;
	struct ext2_inode       inode;
	ext2_filsys             fs = ctx->fs;
	ext2_ino_t              ino;
	errcode_t               retval;
	const char *const *    cpp;
	int                     group, mount_flags;

	clear_problem_context(&pctx);

	/*
	 * If the filesystem is opened read-only, or there is no
	 * journal, then do nothing.
	 */
	if ((ctx->options & E2F_OPT_READONLY) ||
	    (sb->s_journal_inum == 0) ||
	    !(sb->s_feature_compat & EXT3_FEATURE_COMPAT_HAS_JOURNAL))
		return;

	/*
	 * Read in the journal inode
	 */
	if (ext2fs_read_inode(fs, sb->s_journal_inum, &inode) != 0)
		return;

	/*
	 * If it's necessary to backup the journal inode, do so.
	 */
	if ((sb->s_jnl_backup_type == 0) ||
	    ((sb->s_jnl_backup_type == EXT3_JNL_BACKUP_BLOCKS) &&
	     memcmp(inode.i_block, sb->s_jnl_blocks, EXT2_N_BLOCKS*4))) {
		if (fix_problem(ctx, PR_0_BACKUP_JNL, &pctx)) {
			memcpy(sb->s_jnl_blocks, inode.i_block,
			       EXT2_N_BLOCKS*4);
			sb->s_jnl_blocks[16] = inode.i_size;
			sb->s_jnl_backup_type = EXT3_JNL_BACKUP_BLOCKS;
			ext2fs_mark_super_dirty(fs);
			fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
		}
	}

	/*
	 * If the journal is already the hidden inode, then do nothing
	 */
	if (sb->s_journal_inum == EXT2_JOURNAL_INO)
		return;

	/*
	 * The journal inode had better have only one link and not be readable.
	 */
	if (inode.i_links_count != 1)
		return;

	/*
	 * If the filesystem is mounted, or we can't tell whether
	 * or not it's mounted, do nothing.
	 */
	retval = ext2fs_check_if_mounted(ctx->filesystem_name, &mount_flags);
	if (retval || (mount_flags & EXT2_MF_MOUNTED))
		return;

	/*
	 * If we can't find the name of the journal inode, then do
	 * nothing.
	 */
	for (cpp = journal_names; *cpp; cpp++) {
		retval = ext2fs_lookup(fs, EXT2_ROOT_INO, *cpp,
				       strlen(*cpp), 0, &ino);
		if ((retval == 0) && (ino == sb->s_journal_inum))
			break;
	}
	if (*cpp == 0)
		return;

	/* We need the inode bitmap to be loaded */
	retval = ext2fs_read_bitmaps(fs);
	if (retval)
		return;

	pctx.str = *cpp;
	if (!fix_problem(ctx, PR_0_MOVE_JOURNAL, &pctx))
		return;

	/*
	 * OK, we've done all the checks, let's actually move the
	 * journal inode.  Errors at this point mean we need to force
	 * an ext2 filesystem check.
	 */
	if ((retval = ext2fs_unlink(fs, EXT2_ROOT_INO, *cpp, ino, 0)) != 0)
		goto err_out;
	if ((retval = ext2fs_write_inode(fs, EXT2_JOURNAL_INO, &inode)) != 0)
		goto err_out;
	sb->s_journal_inum = EXT2_JOURNAL_INO;
	ext2fs_mark_super_dirty(fs);
	fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY;
	inode.i_links_count = 0;
	inode.i_dtime = time(0);
	if ((retval = ext2fs_write_inode(fs, ino, &inode)) != 0)
		goto err_out;

	group = ext2fs_group_of_ino(fs, ino);
	ext2fs_unmark_inode_bitmap(fs->inode_map, ino);
	ext2fs_mark_ib_dirty(fs);
	fs->group_desc[group].bg_free_inodes_count++;
	fs->super->s_free_inodes_count++;
	return;

err_out:
	pctx.errcode = retval;
	fix_problem(ctx, PR_0_ERR_MOVE_JOURNAL, &pctx);
	fs->super->s_state &= ~EXT2_VALID_FS;
	ext2fs_mark_super_dirty(fs);
}

/*
 * message.c --- print e2fsck messages (with compression)
 *
 * print_e2fsck_message() prints a message to the user, using
 * compression techniques and expansions of abbreviations.
 *
 * The following % expansions are supported:
 *
 *      %b      <blk>                   block number
 *      %B      <blkcount>              integer
 *      %c      <blk2>                  block number
 *      %Di     <dirent>->ino           inode number
 *      %Dn     <dirent>->name          string
 *      %Dr     <dirent>->rec_len
 *      %Dl     <dirent>->name_len
 *      %Dt     <dirent>->filetype
 *      %d      <dir>                   inode number
 *      %g      <group>                 integer
 *      %i      <ino>                   inode number
 *      %Is     <inode> -> i_size
 *      %IS     <inode> -> i_extra_isize
 *      %Ib     <inode> -> i_blocks
 *      %Il     <inode> -> i_links_count
 *      %Im     <inode> -> i_mode
 *      %IM     <inode> -> i_mtime
 *      %IF     <inode> -> i_faddr
 *      %If     <inode> -> i_file_acl
 *      %Id     <inode> -> i_dir_acl
 *      %Iu     <inode> -> i_uid
 *      %Ig     <inode> -> i_gid
 *      %j      <ino2>                  inode number
 *      %m      <com_err error message>
 *      %N      <num>
 *      %p      ext2fs_get_pathname of directory <ino>
 *      %P      ext2fs_get_pathname of <dirent>->ino with <ino2> as
 *                      the containing directory.  (If dirent is NULL
 *                      then return the pathname of directory <ino2>)
 *      %q      ext2fs_get_pathname of directory <dir>
 *      %Q      ext2fs_get_pathname of directory <ino> with <dir> as
 *                      the containing directory.
 *      %s      <str>                   miscellaneous string
 *      %S      backup superblock
 *      %X      <num> hexadecimal format
 *
 * The following '@' expansions are supported:
 *
 *      @a      extended attribute
 *      @A      error allocating
 *      @b      block
 *      @B      bitmap
 *      @c      compress
 *      @C      conflicts with some other fs block
 *      @D      deleted
 *      @d      directory
 *      @e      entry
 *      @E      Entry '%Dn' in %p (%i)
 *      @f      filesystem
 *      @F      for @i %i (%Q) is
 *      @g      group
 *      @h      HTREE directory inode
 *      @i      inode
 *      @I      illegal
 *      @j      journal
 *      @l      lost+found
 *      @L      is a link
 *      @m      multiply-claimed
 *      @n      invalid
 *      @o      orphaned
 *      @p      problem in
 *      @r      root inode
 *      @s      should be
 *      @S      superblock
 *      @u      unattached
 *      @v      device
 *      @z      zero-length
 */


/*
 * This structure defines the abbreviations used by the text strings
 * below.  The first character in the string is the index letter.  An
 * abbreviation of the form '@<i>' is expanded by looking up the index
 * letter <i> in the table below.
 */
static const char *const abbrevs[] = {
	N_("aextended attribute"),
	N_("Aerror allocating"),
	N_("bblock"),
	N_("Bbitmap"),
	N_("ccompress"),
	N_("Cconflicts with some other fs @b"),
	N_("iinode"),
	N_("Iillegal"),
	N_("jjournal"),
	N_("Ddeleted"),
	N_("ddirectory"),
	N_("eentry"),
	N_("E@e '%Dn' in %p (%i)"),
	N_("ffilesystem"),
	N_("Ffor @i %i (%Q) is"),
	N_("ggroup"),
	N_("hHTREE @d @i"),
	N_("llost+found"),
	N_("Lis a link"),
    N_("mmultiply-claimed"),
    N_("ninvalid"),
	N_("oorphaned"),
	N_("pproblem in"),
	N_("rroot @i"),
	N_("sshould be"),
	N_("Ssuper@b"),
	N_("uunattached"),
	N_("vdevice"),
	N_("zzero-length"),
	"@@",
	0
	};

/*
 * Give more user friendly names to the "special" inodes.
 */
#define num_special_inodes      11
static const char *const special_inode_name[] =
{
	N_("<The NULL inode>"),                 /* 0 */
	N_("<The bad blocks inode>"),           /* 1 */
	"/",                                    /* 2 */
	N_("<The ACL index inode>"),            /* 3 */
	N_("<The ACL data inode>"),             /* 4 */
	N_("<The boot loader inode>"),          /* 5 */
	N_("<The undelete directory inode>"),   /* 6 */
	N_("<The group descriptor inode>"),     /* 7 */
	N_("<The journal inode>"),              /* 8 */
	N_("<Reserved inode 9>"),               /* 9 */
	N_("<Reserved inode 10>"),              /* 10 */
};

/*
 * This function does "safe" printing.  It will convert non-printable
 * ASCII characters using '^' and M- notation.
 */
static void safe_print(const char *cp, int len)
{
	unsigned char   ch;

	if (len < 0)
		len = strlen(cp);

	while (len--) {
		ch = *cp++;
		if (ch > 128) {
			fputs("M-", stdout);
			ch -= 128;
		}
		if ((ch < 32) || (ch == 0x7f)) {
			fputc('^', stdout);
			ch ^= 0x40; /* ^@, ^A, ^B; ^? for DEL */
		}
		fputc(ch, stdout);
	}
}


/*
 * This function prints a pathname, using the ext2fs_get_pathname
 * function
 */
static void print_pathname(ext2_filsys fs, ext2_ino_t dir, ext2_ino_t ino)
{
	errcode_t       retval;
	char            *path;

	if (!dir && (ino < num_special_inodes)) {
		fputs(_(special_inode_name[ino]), stdout);
		return;
	}

	retval = ext2fs_get_pathname(fs, dir, ino, &path);
	if (retval)
		fputs("???", stdout);
	else {
		safe_print(path, -1);
		ext2fs_free_mem(&path);
	}
}

static void print_e2fsck_message(e2fsck_t ctx, const char *msg,
			  struct problem_context *pctx, int first);
/*
 * This function handles the '@' expansion.  We allow recursive
 * expansion; an @ expression can contain further '@' and '%'
 * expressions.
 */
static void expand_at_expression(e2fsck_t ctx, char ch,
					  struct problem_context *pctx,
					  int *first)
{
	const char *const *cpp;
	const char *str;

	/* Search for the abbreviation */
	for (cpp = abbrevs; *cpp; cpp++) {
		if (ch == *cpp[0])
			break;
	}
	if (*cpp) {
		str = _(*cpp) + 1;
		if (*first && islower(*str)) {
			*first = 0;
			fputc(toupper(*str++), stdout);
		}
		print_e2fsck_message(ctx, str, pctx, *first);
	} else
		printf("@%c", ch);
}

/*
 * This function expands '%IX' expressions
 */
static void expand_inode_expression(char ch,
					     struct problem_context *ctx)
{
	struct ext2_inode       *inode;
	struct ext2_inode_large *large_inode;
	char *                  time_str;
	time_t                  t;
	int                     do_gmt = -1;

	if (!ctx || !ctx->inode)
		goto no_inode;

	inode = ctx->inode;
	large_inode = (struct ext2_inode_large *) inode;

	switch (ch) {
	case 's':
		if (LINUX_S_ISDIR(inode->i_mode))
			printf("%u", inode->i_size);
		else {
			printf("%"PRIu64, (inode->i_size |
					((uint64_t) inode->i_size_high << 32)));
		}
		break;
	case 'S':
		printf("%u", large_inode->i_extra_isize);
		break;
	case 'b':
		printf("%u", inode->i_blocks);
		break;
	case 'l':
		printf("%d", inode->i_links_count);
		break;
	case 'm':
		pr