This commit was generated by cvs2svn to compensate for changes in r55289,

which included commits to RCS files with non-trunk default branches.

2 files changed, 806 insertions, 0 deletions

diff --git a/sys/gnu/ext2fs/ext2_bitmap.c b/sys/gnu/ext2fs/ext2_bitmap.c
new file mode 100644
index 0000000..8b9b5d2
--- /dev/null
+++ b/sys/gnu/ext2fs/ext2_bitmap.c
@@ -0,0 +1,26 @@
+/*
+ *  linux/fs/ext2/bitmap.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)
+ */
+
+#include <linux/fs.h>
+#include <linux/ext2_fs.h>
+
+static int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};
+
+unsigned long ext2_count_free (struct buffer_head * map, unsigned int numchars)
+{
+	unsigned int i;
+	unsigned long sum = 0;
+	
+	if (!map) 
+		return (0);
+	for (i = 0; i < numchars; i++)
+		sum += nibblemap[map->b_data[i] & 0xf] +
+			nibblemap[(map->b_data[i] >> 4) & 0xf];
+	return (sum);
+}
diff --git a/sys/gnu/ext2fs/ext2_super.c b/sys/gnu/ext2fs/ext2_super.c
new file mode 100644
index 0000000..b73cc52
--- /dev/null
+++ b/sys/gnu/ext2fs/ext2_super.c
@@ -0,0 +1,780 @@
+/*
+ *  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
+ */
+
+#include <stdarg.h>
+
+#include <asm/segment.h>
+#include <asm/system.h>
+
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/ext2_fs.h>
+#include <linux/malloc.h>
+#include <linux/sched.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/locks.h>
+
+static char error_buf[1024];
+
+void ext2_error (struct super_block * sb, const char * function,
+		 const char * fmt, ...)
+{
+	va_list args;
+
+	if (!(sb->s_flags & MS_RDONLY)) {
+		sb->u.ext2_sb.s_mount_state |= EXT2_ERROR_FS;
+		sb->u.ext2_sb.s_es->s_state |= EXT2_ERROR_FS;
+		mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
+		sb->s_dirt = 1;
+	}
+	va_start (args, fmt);
+	vsprintf (error_buf, fmt, args);
+	va_end (args);
+	if (test_opt (sb, ERRORS_PANIC) ||
+	    (sb->u.ext2_sb.s_es->s_errors == EXT2_ERRORS_PANIC &&
+	     !test_opt (sb, ERRORS_CONT) && !test_opt (sb, ERRORS_RO)))
+		panic ("EXT2-fs panic (device %d/%d): %s: %s\n",
+		       MAJOR(sb->s_dev), MINOR(sb->s_dev), function, error_buf);
+	printk (KERN_CRIT "EXT2-fs error (device %d/%d): %s: %s\n",
+		MAJOR(sb->s_dev), MINOR(sb->s_dev), function, error_buf);
+	if (test_opt (sb, ERRORS_RO) ||
+	    (sb->u.ext2_sb.s_es->s_errors == EXT2_ERRORS_RO &&
+	     !test_opt (sb, ERRORS_CONT) && !test_opt (sb, ERRORS_PANIC))) {
+		printk ("Remounting filesystem read-only\n");
+		sb->s_flags |= MS_RDONLY;
+	}
+}
+
+NORET_TYPE void ext2_panic (struct super_block * sb, const char * function,
+			    const char * fmt, ...)
+{
+	va_list args;
+
+	if (!(sb->s_flags & MS_RDONLY)) {
+		sb->u.ext2_sb.s_mount_state |= EXT2_ERROR_FS;
+		sb->u.ext2_sb.s_es->s_state |= EXT2_ERROR_FS;
+		mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
+		sb->s_dirt = 1;
+	}
+	va_start (args, fmt);
+	vsprintf (error_buf, fmt, args);
+	va_end (args);
+	panic ("EXT2-fs panic (device %d/%d): %s: %s\n",
+	       MAJOR(sb->s_dev), MINOR(sb->s_dev), function, error_buf);
+}
+
+void ext2_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 "EXT2-fs warning (device %d/%d): %s: %s\n",
+		MAJOR(sb->s_dev), MINOR(sb->s_dev), function, error_buf);
+}
+
+void ext2_put_super (struct super_block * sb)
+{
+	int db_count;
+	int i;
+
+	lock_super (sb);
+	if (!(sb->s_flags & MS_RDONLY)) {
+		sb->u.ext2_sb.s_es->s_state = sb->u.ext2_sb.s_mount_state;
+		mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
+	}
+	sb->s_dev = 0;
+	db_count = sb->u.ext2_sb.s_db_per_group;
+	for (i = 0; i < db_count; i++)
+		if (sb->u.ext2_sb.s_group_desc[i])
+			brelse (sb->u.ext2_sb.s_group_desc[i]);
+	kfree_s (sb->u.ext2_sb.s_group_desc,
+		 db_count * sizeof (struct buffer_head *));
+	for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
+		if (sb->u.ext2_sb.s_inode_bitmap[i])
+			brelse (sb->u.ext2_sb.s_inode_bitmap[i]);
+	for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
+		if (sb->u.ext2_sb.s_block_bitmap[i])
+			brelse (sb->u.ext2_sb.s_block_bitmap[i]);
+	brelse (sb->u.ext2_sb.s_sbh);
+	unlock_super (sb);
+	return;
+}
+
+static struct super_operations ext2_sops = { 
+	ext2_read_inode,
+	NULL,
+	ext2_write_inode,
+	ext2_put_inode,
+	ext2_put_super,
+	ext2_write_super,
+	ext2_statfs,
+	ext2_remount
+};
+
+#ifdef EXT2FS_PRE_02B_COMPAT
+
+static int convert_pre_02b_fs (struct super_block * sb,
+			       struct buffer_head * bh)
+{
+	struct ext2_super_block * es;
+	struct ext2_old_group_desc old_group_desc [BLOCK_SIZE / sizeof (struct ext2_old_group_desc)];
+	struct ext2_group_desc * gdp;
+	struct buffer_head * bh2;
+	int groups_count;
+	int i;
+
+	es = (struct ext2_super_block *) bh->b_data;
+	bh2 = bread (sb->s_dev, 2, BLOCK_SIZE);
+	if (!bh2) {
+		printk ("Cannot read descriptor blocks while converting !\n");
+		return 0;
+	}
+	memcpy (old_group_desc, bh2->b_data, BLOCK_SIZE);
+	groups_count = (sb->u.ext2_sb.s_blocks_count - 
+			sb->u.ext2_sb.s_first_data_block +
+			(EXT2_BLOCK_SIZE(sb) * 8) - 1) /
+				(EXT2_BLOCK_SIZE(sb) * 8);
+	memset (bh2->b_data, 0, BLOCK_SIZE);
+	gdp = (struct ext2_group_desc *) bh2->b_data;
+	for (i = 0; i < groups_count; i++) {
+		gdp[i].bg_block_bitmap = old_group_desc[i].bg_block_bitmap;
+		gdp[i].bg_inode_bitmap = old_group_desc[i].bg_inode_bitmap;
+		gdp[i].bg_inode_table = old_group_desc[i].bg_inode_table;
+		gdp[i].bg_free_blocks_count = old_group_desc[i].bg_free_blocks_count;
+		gdp[i].bg_free_inodes_count = old_group_desc[i].bg_free_inodes_count;
+	}
+	mark_buffer_dirty(bh2, 1);
+	brelse (bh2);
+	es->s_magic = EXT2_SUPER_MAGIC;
+	mark_buffer_dirty(bh, 1);
+	sb->s_magic = EXT2_SUPER_MAGIC;
+	return 1;
+}
+
+#endif
+
+/*
+ * This function has been shamelessly adapted from the msdos fs
+ */
+static int parse_options (char * options, unsigned long * sb_block,
+			  unsigned short *resuid, unsigned short * resgid,
+			  unsigned long * mount_options)
+{
+	char * this_char;
+	char * value;
+
+	if (!options)
+		return 1;
+	for (this_char = strtok (options, ",");
+	     this_char != NULL;
+	     this_char = strtok (NULL, ",")) {
+		if ((value = strchr (this_char, '=')) != NULL)
+			*value++ = 0;
+		if (!strcmp (this_char, "bsddf"))
+			clear_opt (*mount_options, MINIX_DF);
+		else if (!strcmp (this_char, "check")) {
+			if (!value || !*value)
+				set_opt (*mount_options, CHECK_NORMAL);
+			else if (!strcmp (value, "none")) {
+				clear_opt (*mount_options, CHECK_NORMAL);
+				clear_opt (*mount_options, CHECK_STRICT);
+			}
+			else if (strcmp (value, "normal"))
+				set_opt (*mount_options, CHECK_NORMAL);
+			else if (strcmp (value, "strict")) {
+				set_opt (*mount_options, CHECK_NORMAL);
+				set_opt (*mount_options, CHECK_STRICT);
+			}
+			else {
+				printk ("EXT2-fs: Invalid check option: %s\n",
+					value);
+				return 0;
+			}
+		}
+		else if (!strcmp (this_char, "debug"))
+			set_opt (*mount_options, DEBUG);
+		else if (!strcmp (this_char, "errors")) {
+			if (!value || !*value) {
+				printk ("EXT2-fs: the errors option requires "
+					"an argument");
+				return 0;
+			}
+			if (!strcmp (value, "continue")) {
+				clear_opt (*mount_options, ERRORS_RO);
+				clear_opt (*mount_options, ERRORS_PANIC);
+				set_opt (*mount_options, ERRORS_CONT);
+			}
+			else if (!strcmp (value, "remount-ro")) {
+				clear_opt (*mount_options, ERRORS_CONT);
+				clear_opt (*mount_options, ERRORS_PANIC);
+				set_opt (*mount_options, ERRORS_RO);
+			}
+			else if (!strcmp (value, "panic")) {
+				clear_opt (*mount_options, ERRORS_CONT);
+				clear_opt (*mount_options, ERRORS_RO);
+				set_opt (*mount_options, ERRORS_PANIC);
+			}
+			else {
+				printk ("EXT2-fs: Invalid errors option: %s\n",
+					value);
+				return 0;
+			}
+		}
+		else if (!strcmp (this_char, "grpid") ||
+			 !strcmp (this_char, "bsdgroups"))
+			set_opt (*mount_options, GRPID);
+		else if (!strcmp (this_char, "minixdf"))
+			set_opt (*mount_options, MINIX_DF);
+		else if (!strcmp (this_char, "nocheck")) {
+			clear_opt (*mount_options, CHECK_NORMAL);
+			clear_opt (*mount_options, CHECK_STRICT);
+		}
+		else if (!strcmp (this_char, "nogrpid") ||
+			 !strcmp (this_char, "sysvgroups"))
+			clear_opt (*mount_options, GRPID);
+		else if (!strcmp (this_char, "resgid")) {
+			if (!value || !*value) {
+				printk ("EXT2-fs: the resgid option requires "
+					"an argument");
+				return 0;
+			}
+			*resgid = simple_strtoul (value, &value, 0);
+			if (*value) {
+				printk ("EXT2-fs: Invalid resgid option: %s\n",
+					value);
+				return 0;
+			}
+		}
+		else if (!strcmp (this_char, "resuid")) {
+			if (!value || !*value) {
+				printk ("EXT2-fs: the resuid option requires "
+					"an argument");
+				return 0;
+			}
+			*resuid = simple_strtoul (value, &value, 0);
+			if (*value) {
+				printk ("EXT2-fs: Invalid resuid option: %s\n",
+					value);
+				return 0;
+			}
+		}
+		else if (!strcmp (this_char, "sb")) {
+			if (!value || !*value) {
+				printk ("EXT2-fs: the sb option requires "
+					"an argument");
+				return 0;
+			}
+			*sb_block = simple_strtoul (value, &value, 0);
+			if (*value) {
+				printk ("EXT2-fs: Invalid sb option: %s\n",
+					value);
+				return 0;
+			}
+		}
+		else {
+			printk ("EXT2-fs: Unrecognized mount option %s\n", this_char);
+			return 0;
+		}
+	}
+	return 1;
+}
+
+static void ext2_setup_super (struct super_block * sb,
+			      struct ext2_super_block * es)
+{
+	if (es->s_rev_level > EXT2_CURRENT_REV) {
+			printk ("EXT2-fs warning: revision level too high, "
+				"forcing read/only mode\n");
+			sb->s_flags |= MS_RDONLY;
+	}
+	if (!(sb->s_flags & MS_RDONLY)) {
+		if (!(sb->u.ext2_sb.s_mount_state & EXT2_VALID_FS))
+			printk ("EXT2-fs warning: mounting unchecked fs, "
+				"running e2fsck is recommended\n");
+		else if ((sb->u.ext2_sb.s_mount_state & EXT2_ERROR_FS))
+			printk ("EXT2-fs warning: mounting fs with errors, "
+				"running e2fsck is recommended\n");
+		else if (es->s_max_mnt_count >= 0 &&
+		         es->s_mnt_count >= (unsigned short) es->s_max_mnt_count)
+			printk ("EXT2-fs warning: maximal mount count reached, "
+				"running e2fsck is recommended\n");
+		else if (es->s_checkinterval &&
+			(es->s_lastcheck + es->s_checkinterval <= CURRENT_TIME))
+			printk ("EXT2-fs warning: checktime reached, "
+				"running e2fsck is recommended\n");
+		es->s_state &= ~EXT2_VALID_FS;
+		if (!es->s_max_mnt_count)
+			es->s_max_mnt_count = EXT2_DFL_MAX_MNT_COUNT;
+		es->s_mnt_count++;
+		es->s_mtime = CURRENT_TIME;
+		mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
+		sb->s_dirt = 1;
+		if (test_opt (sb, DEBUG))
+			printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
+				"bpg=%lu, ipg=%lu, mo=%04lx]\n",
+				EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
+				sb->u.ext2_sb.s_frag_size,
+				sb->u.ext2_sb.s_groups_count,
+				EXT2_BLOCKS_PER_GROUP(sb),
+				EXT2_INODES_PER_GROUP(sb),
+				sb->u.ext2_sb.s_mount_opt);
+		if (test_opt (sb, CHECK)) {
+			ext2_check_blocks_bitmap (sb);
+			ext2_check_inodes_bitmap (sb);
+		}
+	}
+}
+
+static int ext2_check_descriptors (struct super_block * sb)
+{
+	int i;
+	int desc_block = 0;
+	unsigned long block = sb->u.ext2_sb.s_es->s_first_data_block;
+	struct ext2_group_desc * gdp = NULL;
+
+	ext2_debug ("Checking group descriptors");
+
+	for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++)
+	{
+		if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
+			gdp = (struct ext2_group_desc *) sb->u.ext2_sb.s_group_desc[desc_block++]->b_data;
+		if (gdp->bg_block_bitmap < block ||
+		    gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
+		{
+			ext2_error (sb, "ext2_check_descriptors",
+				    "Block bitmap for group %d"
+				    " not in group (block %lu)!",
+				    i, (unsigned long) gdp->bg_block_bitmap);
+			return 0;
+		}
+		if (gdp->bg_inode_bitmap < block ||
+		    gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
+		{
+			ext2_error (sb, "ext2_check_descriptors",
+				    "Inode bitmap for group %d"
+				    " not in group (block %lu)!",
+				    i, (unsigned long) gdp->bg_inode_bitmap);
+			return 0;
+		}
+		if (gdp->bg_inode_table < block ||
+		    gdp->bg_inode_table + sb->u.ext2_sb.s_itb_per_group >=
+		    block + EXT2_BLOCKS_PER_GROUP(sb))
+		{
+			ext2_error (sb, "ext2_check_descriptors",
+				    "Inode table for group %d"
+				    " not in group (block %lu)!",
+				    i, (unsigned long) gdp->bg_inode_table);
+			return 0;
+		}
+		block += EXT2_BLOCKS_PER_GROUP(sb);
+		gdp++;
+	}
+	return 1;
+}
+
+struct super_block * ext2_read_super (struct super_block * sb, void * data,
+				      int silent)
+{
+	struct buffer_head * bh;
+	struct ext2_super_block * es;
+	unsigned long sb_block = 1;
+	unsigned short resuid = EXT2_DEF_RESUID;
+	unsigned short resgid = EXT2_DEF_RESGID;
+	unsigned long logic_sb_block = 1;
+	int dev = sb->s_dev;
+	int db_count;
+	int i, j;
+#ifdef EXT2FS_PRE_02B_COMPAT
+	int fs_converted = 0;
+#endif
+
+	set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_NORMAL);
+	if (!parse_options ((char *) data, &sb_block, &resuid, &resgid,
+	    &sb->u.ext2_sb.s_mount_opt)) {
+		sb->s_dev = 0;
+		return NULL;
+	}
+
+	lock_super (sb);
+	set_blocksize (dev, BLOCK_SIZE);
+	if (!(bh = bread (dev, sb_block, BLOCK_SIZE))) {
+		sb->s_dev = 0;
+		unlock_super (sb);
+		printk ("EXT2-fs: unable to read superblock\n");
+		return NULL;
+	}
+	/*
+	 * Note: s_es must be initialized s_es as soon as possible because
+	 * some ext2 macro-instructions depend on its value
+	 */
+	es = (struct ext2_super_block *) bh->b_data;
+	sb->u.ext2_sb.s_es = es;
+	sb->s_magic = es->s_magic;
+	if (sb->s_magic != EXT2_SUPER_MAGIC
+#ifdef EXT2FS_PRE_02B_COMPAT
+	   && sb->s_magic != EXT2_PRE_02B_MAGIC
+#endif
+	   ) {
+		sb->s_dev = 0;
+		unlock_super (sb);
+		brelse (bh);
+		if (!silent)
+			printk ("VFS: Can't find an ext2 filesystem on dev %d/%d.\n",
+				MAJOR(dev), MINOR(dev));
+		return NULL;
+	}
+	sb->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
+	sb->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(sb);
+	if (sb->s_blocksize != BLOCK_SIZE && 
+	    (sb->s_blocksize == 1024 || sb->s_blocksize == 2048 ||  
+	     sb->s_blocksize == 4096)) {
+		unsigned long offset;
+
+		brelse (bh);
+		set_blocksize (dev, sb->s_blocksize);
+		logic_sb_block = (sb_block*BLOCK_SIZE) / sb->s_blocksize;
+		offset = (sb_block*BLOCK_SIZE) % sb->s_blocksize;
+		bh = bread (dev, logic_sb_block, sb->s_blocksize);
+		if(!bh)
+			return NULL;
+		es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
+		sb->u.ext2_sb.s_es = es;
+		if (es->s_magic != EXT2_SUPER_MAGIC) {
+			sb->s_dev = 0;
+			unlock_super (sb);
+			brelse (bh);
+			printk ("EXT2-fs: Magic mismatch, very weird !\n");
+			return NULL;
+		}
+	}
+	sb->u.ext2_sb.s_frag_size = EXT2_MIN_FRAG_SIZE <<
+				   es->s_log_frag_size;
+	if (sb->u.ext2_sb.s_frag_size)
+		sb->u.ext2_sb.s_frags_per_block = sb->s_blocksize /
+						  sb->u.ext2_sb.s_frag_size;
+	else
+		sb->s_magic = 0;
+	sb->u.ext2_sb.s_blocks_per_group = es->s_blocks_per_group;
+	sb->u.ext2_sb.s_frags_per_group = es->s_frags_per_group;
+	sb->u.ext2_sb.s_inodes_per_group = es->s_inodes_per_group;
+	sb->u.ext2_sb.s_inodes_per_block = sb->s_blocksize /
+					   sizeof (struct ext2_inode);
+	sb->u.ext2_sb.s_itb_per_group = sb->u.ext2_sb.s_inodes_per_group /
+				        sb->u.ext2_sb.s_inodes_per_block;
+	sb->u.ext2_sb.s_desc_per_block = sb->s_blocksize /
+					 sizeof (struct ext2_group_desc);
+	sb->u.ext2_sb.s_sbh = bh;
+	sb->u.ext2_sb.s_es = es;
+	if (resuid != EXT2_DEF_RESUID)
+		sb->u.ext2_sb.s_resuid = resuid;
+	else
+		sb->u.ext2_sb.s_resuid = es->s_def_resuid;
+	if (resgid != EXT2_DEF_RESGID)
+		sb->u.ext2_sb.s_resgid = resgid;
+	else
+		sb->u.ext2_sb.s_resgid = es->s_def_resgid;
+	sb->u.ext2_sb.s_mount_state = es->s_state;
+	sb->u.ext2_sb.s_rename_lock = 0;
+	sb->u.ext2_sb.s_rename_wait = NULL;
+#ifdef EXT2FS_PRE_02B_COMPAT
+	if (sb->s_magic == EXT2_PRE_02B_MAGIC) {
+		if (es->s_blocks_count > 262144) {
+			/*
+			 * fs > 256 MB can't be converted
+			 */ 
+			sb->s_dev = 0;
+			unlock_super (sb);
+			brelse (bh);
+			printk ("EXT2-fs: trying to mount a pre-0.2b file"
+				"system which cannot be converted\n");
+			return NULL;
+		}
+		printk ("EXT2-fs: mounting a pre 0.2b file system, "
+			"will try to convert the structure\n");
+		if (!(sb->s_flags & MS_RDONLY)) {
+			sb->s_dev = 0;
+			unlock_super (sb);
+			brelse (bh);
+			printk ("EXT2-fs: cannot convert a read-only fs\n");
+			return NULL;
+		}
+		if (!convert_pre_02b_fs (sb, bh)) {
+			sb->s_dev = 0;
+			unlock_super (sb);
+			brelse (bh);
+			printk ("EXT2-fs: conversion failed !!!\n");
+			return NULL;
+		}
+		printk ("EXT2-fs: conversion succeeded !!!\n");
+		fs_converted = 1;
+	}
+#endif
+	if (sb->s_magic != EXT2_SUPER_MAGIC) {
+		sb->s_dev = 0;
+		unlock_super (sb);
+		brelse (bh);
+		if (!silent)
+			printk ("VFS: Can't find an ext2 filesystem on dev %d/%d.\n",
+				MAJOR(dev), MINOR(dev));
+		return NULL;
+	}
+	if (sb->s_blocksize != bh->b_size) {
+		sb->s_dev = 0;
+		unlock_super (sb);
+		brelse (bh);
+		if (!silent)
+			printk ("VFS: Unsupported blocksize on dev 0x%04x.\n",
+				dev);
+		return NULL;
+	}
+
+	if (sb->s_blocksize != sb->u.ext2_sb.s_frag_size) {
+		sb->s_dev = 0;
+		unlock_super (sb);
+		brelse (bh);
+		printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
+			sb->u.ext2_sb.s_frag_size, sb->s_blocksize);
+		return NULL;
+	}
+
+	if (sb->u.ext2_sb.s_blocks_per_group > sb->s_blocksize * 8) {
+		sb->s_dev = 0;
+		unlock_super (sb);
+		brelse (bh);
+		printk ("EXT2-fs: #blocks per group too big: %lu\n",
+			sb->u.ext2_sb.s_blocks_per_group);
+		return NULL;
+	}
+	if (sb->u.ext2_sb.s_frags_per_group > sb->s_blocksize * 8) {
+		sb->s_dev = 0;
+		unlock_super (sb);
+		brelse (bh);
+		printk ("EXT2-fs: #fragments per group too big: %lu\n",
+			sb->u.ext2_sb.s_frags_per_group);
+		return NULL;
+	}
+	if (sb->u.ext2_sb.s_inodes_per_group > sb->s_blocksize * 8) {
+		sb->s_dev = 0;
+		unlock_super (sb);
+		brelse (bh);
+		printk ("EXT2-fs: #inodes per group too big: %lu\n",
+			sb->u.ext2_sb.s_inodes_per_group);
+		return NULL;
+	}
+
+	sb->u.ext2_sb.s_groups_count = (es->s_blocks_count -
+				        es->s_first_data_block +
+				       EXT2_BLOCKS_PER_GROUP(sb) - 1) /
+				       EXT2_BLOCKS_PER_GROUP(sb);
+	db_count = (sb->u.ext2_sb.s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
+		   EXT2_DESC_PER_BLOCK(sb);
+	sb->u.ext2_sb.s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
+	if (sb->u.ext2_sb.s_group_desc == NULL) {
+		sb->s_dev = 0;
+		unlock_super (sb);
+		brelse (bh);
+		printk ("EXT2-fs: not enough memory\n");
+		return NULL;
+	}
+	for (i = 0; i < db_count; i++) {
+		sb->u.ext2_sb.s_group_desc[i] = bread (dev, logic_sb_block + i + 1,
+						       sb->s_blocksize);
+		if (!sb->u.ext2_sb.s_group_desc[i]) {
+			sb->s_dev = 0;
+			unlock_super (sb);
+			for (j = 0; j < i; j++)
+				brelse (sb->u.ext2_sb.s_group_desc[j]);
+			kfree_s (sb->u.ext2_sb.s_group_desc,
+				 db_count * sizeof (struct buffer_head *));
+			brelse (bh);
+			printk ("EXT2-fs: unable to read group descriptors\n");
+			return NULL;
+		}
+	}
+	if (!ext2_check_descriptors (sb)) {
+		sb->s_dev = 0;
+		unlock_super (sb);
+		for (j = 0; j < db_count; j++)
+			brelse (sb->u.ext2_sb.s_group_desc[j]);
+		kfree_s (sb->u.ext2_sb.s_group_desc,
+			 db_count * sizeof (struct buffer_head *));
+		brelse (bh);
+		printk ("EXT2-fs: group descriptors corrupted !\n");
+		return NULL;
+	}
+	for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
+		sb->u.ext2_sb.s_inode_bitmap_number[i] = 0;
+		sb->u.ext2_sb.s_inode_bitmap[i] = NULL;
+		sb->u.ext2_sb.s_block_bitmap_number[i] = 0;
+		sb->u.ext2_sb.s_block_bitmap[i] = NULL;
+	}
+	sb->u.ext2_sb.s_loaded_inode_bitmaps = 0;
+	sb->u.ext2_sb.s_loaded_block_bitmaps = 0;
+	sb->u.ext2_sb.s_db_per_group = db_count;
+	unlock_super (sb);
+	/*
+	 * set up enough so that it can read an inode
+	 */
+	sb->s_dev = dev;
+	sb->s_op = &ext2_sops;
+	if (!(sb->s_mounted = iget (sb, EXT2_ROOT_INO))) {
+		sb->s_dev = 0;
+		for (i = 0; i < db_count; i++)
+			if (sb->u.ext2_sb.s_group_desc[i])
+				brelse (sb->u.ext2_sb.s_group_desc[i]);
+		kfree_s (sb->u.ext2_sb.s_group_desc,
+			 db_count * sizeof (struct buffer_head *));
+		brelse (bh);
+		printk ("EXT2-fs: get root inode failed\n");
+		return NULL;
+	}
+#ifdef EXT2FS_PRE_02B_COMPAT
+	if (fs_converted) {
+		for (i = 0; i < db_count; i++)
+			mark_buffer_dirty(sb->u.ext2_sb.s_group_desc[i], 1);
+		sb->s_dirt = 1;
+	}
+#endif
+	ext2_setup_super (sb, es);
+	return sb;
+}
+
+static void ext2_commit_super (struct super_block * sb,
+			       struct ext2_super_block * es)
+{
+	es->s_wtime = CURRENT_TIME;
+	mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
+	sb->s_dirt = 0;
+}
+
+/*
+ * In the second extended file system, it is not necessary to
+ * write the super block since we use a mapping of the
+ * disk super block in a buffer.
+ *
+ * However, this function is still used to set the fs valid
+ * flags to 0.  We need to set this flag to 0 since the fs
+ * may have been checked while mounted and e2fsck may have
+ * set s_state to EXT2_VALID_FS after some corrections.
+ */
+
+void ext2_write_super (struct super_block * sb)
+{
+	struct ext2_super_block * es;
+
+	if (!(sb->s_flags & MS_RDONLY)) {
+		es = sb->u.ext2_sb.s_es;
+
+		ext2_debug ("setting valid to 0\n");
+
+		if (es->s_state & EXT2_VALID_FS) {
+			es->s_state &= ~EXT2_VALID_FS;
+			es->s_mtime = CURRENT_TIME;
+		}
+		ext2_commit_super (sb, es);
+	}
+	sb->s_dirt = 0;
+}
+
+int ext2_remount (struct super_block * sb, int * flags, char * data)
+{
+	struct ext2_super_block * es;
+	unsigned short resuid = sb->u.ext2_sb.s_resuid;
+	unsigned short resgid = sb->u.ext2_sb.s_resgid;
+	unsigned long new_mount_opt;
+	unsigned long tmp;
+
+	/*
+	 * Allow the "check" option to be passed as a remount option.
+	 */
+	set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_NORMAL);
+	if (!parse_options (data, &tmp, &resuid, &resgid,
+			    &new_mount_opt))
+		return -EINVAL;
+
+	sb->u.ext2_sb.s_mount_opt = new_mount_opt;
+	sb->u.ext2_sb.s_resuid = resuid;
+	sb->u.ext2_sb.s_resgid = resgid;
+	es = sb->u.ext2_sb.s_es;
+	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
+		return 0;
+	if (*flags & MS_RDONLY) {
+		if (es->s_state & EXT2_VALID_FS ||
+		    !(sb->u.ext2_sb.s_mount_state & EXT2_VALID_FS))
+			return 0;
+		/*
+		 * OK, we are remounting a valid rw partition rdonly, so set
+		 * the rdonly flag and then mark the partition as valid again.
+		 */
+		es->s_state = sb->u.ext2_sb.s_mount_state;
+		es->s_mtime = CURRENT_TIME;
+		mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
+		sb->s_dirt = 1;
+		ext2_commit_super (sb, es);
+	}
+	else {
+		/*
+		 * Mounting a RDONLY partition read-write, so reread and
+		 * store the current valid flag.  (It may have been changed 
+		 * by e2fsck since we originally mounted the partition.)
+		 */
+		sb->u.ext2_sb.s_mount_state = es->s_state;
+		sb->s_flags &= ~MS_RDONLY;
+		ext2_setup_super (sb, es);
+	}
+	return 0;
+}
+
+void ext2_statfs (struct super_block * sb, struct statfs * buf)
+{
+	long tmp;
+	unsigned long overhead;
+	unsigned long overhead_per_group;
+
+	if (test_opt (sb, MINIX_DF))
+		overhead = 0;
+	else {
+		/*
+		 * Compute the overhead (FS structures)
+		 */
+		overhead_per_group = 1 /* super block */ +
+				     sb->u.ext2_sb.s_db_per_group /* descriptors */ +
+				     1 /* block bitmap */ +
+				     1 /* inode bitmap */ +
+				     sb->u.ext2_sb.s_itb_per_group /* inode table */;
+		overhead = sb->u.ext2_sb.s_es->s_first_data_block +
+			   sb->u.ext2_sb.s_groups_count * overhead_per_group;
+	}
+
+	put_fs_long (EXT2_SUPER_MAGIC, &buf->f_type);
+	put_fs_long (sb->s_blocksize, &buf->f_bsize);
+	put_fs_long (sb->u.ext2_sb.s_es->s_blocks_count - overhead,
+		     &buf->f_blocks);
+	tmp = ext2_count_free_blocks (sb);
+	put_fs_long (tmp, &buf->f_bfree);
+	if (tmp >= sb->u.ext2_sb.s_es->s_r_blocks_count)
+		put_fs_long (tmp - sb->u.ext2_sb.s_es->s_r_blocks_count,
+			     &buf->f_bavail);
+	else
+		put_fs_long (0, &buf->f_bavail);
+	put_fs_long (sb->u.ext2_sb.s_es->s_inodes_count, &buf->f_files);
+	put_fs_long (ext2_count_free_inodes (sb), &buf->f_ffree);
+	put_fs_long (EXT2_NAME_LEN, &buf->f_namelen);
+	/* Don't know what value to put in buf->f_fsid */
+}