This commit was generated by cvs2svn to compensate for changes in r55289,
which included commits to RCS files with non-trunk default branches.
This commit is contained in:
Bruce Evans
commit
c15ee3ea23
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@ -0,0 +1,26 @@
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|||
/*
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* linux/fs/ext2/bitmap.c
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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||||
* Universite Pierre et Marie Curie (Paris VI)
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*/
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#include <linux/fs.h>
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#include <linux/ext2_fs.h>
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static int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};
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unsigned long ext2_count_free (struct buffer_head * map, unsigned int numchars)
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{
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unsigned int i;
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unsigned long sum = 0;
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if (!map)
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return (0);
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for (i = 0; i < numchars; i++)
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sum += nibblemap[map->b_data[i] & 0xf] +
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nibblemap[(map->b_data[i] >> 4) & 0xf];
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return (sum);
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}
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@ -0,0 +1,780 @@
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/*
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* linux/fs/ext2/super.c
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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||||
* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/fs/minix/inode.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#include <stdarg.h>
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#include <asm/segment.h>
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#include <asm/system.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/ext2_fs.h>
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#include <linux/malloc.h>
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#include <linux/sched.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/locks.h>
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static char error_buf[1024];
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void ext2_error (struct super_block * sb, const char * function,
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const char * fmt, ...)
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{
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va_list args;
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if (!(sb->s_flags & MS_RDONLY)) {
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sb->u.ext2_sb.s_mount_state |= EXT2_ERROR_FS;
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sb->u.ext2_sb.s_es->s_state |= EXT2_ERROR_FS;
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mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
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sb->s_dirt = 1;
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}
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va_start (args, fmt);
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vsprintf (error_buf, fmt, args);
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va_end (args);
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if (test_opt (sb, ERRORS_PANIC) ||
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(sb->u.ext2_sb.s_es->s_errors == EXT2_ERRORS_PANIC &&
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!test_opt (sb, ERRORS_CONT) && !test_opt (sb, ERRORS_RO)))
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panic ("EXT2-fs panic (device %d/%d): %s: %s\n",
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MAJOR(sb->s_dev), MINOR(sb->s_dev), function, error_buf);
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printk (KERN_CRIT "EXT2-fs error (device %d/%d): %s: %s\n",
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MAJOR(sb->s_dev), MINOR(sb->s_dev), function, error_buf);
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if (test_opt (sb, ERRORS_RO) ||
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(sb->u.ext2_sb.s_es->s_errors == EXT2_ERRORS_RO &&
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!test_opt (sb, ERRORS_CONT) && !test_opt (sb, ERRORS_PANIC))) {
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printk ("Remounting filesystem read-only\n");
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sb->s_flags |= MS_RDONLY;
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}
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}
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NORET_TYPE void ext2_panic (struct super_block * sb, const char * function,
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const char * fmt, ...)
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{
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va_list args;
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if (!(sb->s_flags & MS_RDONLY)) {
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sb->u.ext2_sb.s_mount_state |= EXT2_ERROR_FS;
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sb->u.ext2_sb.s_es->s_state |= EXT2_ERROR_FS;
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mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
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sb->s_dirt = 1;
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}
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va_start (args, fmt);
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vsprintf (error_buf, fmt, args);
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va_end (args);
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panic ("EXT2-fs panic (device %d/%d): %s: %s\n",
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MAJOR(sb->s_dev), MINOR(sb->s_dev), function, error_buf);
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}
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void ext2_warning (struct super_block * sb, const char * function,
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const char * fmt, ...)
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{
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va_list args;
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va_start (args, fmt);
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vsprintf (error_buf, fmt, args);
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va_end (args);
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printk (KERN_WARNING "EXT2-fs warning (device %d/%d): %s: %s\n",
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MAJOR(sb->s_dev), MINOR(sb->s_dev), function, error_buf);
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}
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void ext2_put_super (struct super_block * sb)
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{
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int db_count;
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int i;
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lock_super (sb);
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if (!(sb->s_flags & MS_RDONLY)) {
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sb->u.ext2_sb.s_es->s_state = sb->u.ext2_sb.s_mount_state;
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mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
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}
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sb->s_dev = 0;
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db_count = sb->u.ext2_sb.s_db_per_group;
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for (i = 0; i < db_count; i++)
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if (sb->u.ext2_sb.s_group_desc[i])
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brelse (sb->u.ext2_sb.s_group_desc[i]);
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kfree_s (sb->u.ext2_sb.s_group_desc,
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db_count * sizeof (struct buffer_head *));
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for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
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if (sb->u.ext2_sb.s_inode_bitmap[i])
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brelse (sb->u.ext2_sb.s_inode_bitmap[i]);
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for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
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if (sb->u.ext2_sb.s_block_bitmap[i])
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brelse (sb->u.ext2_sb.s_block_bitmap[i]);
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brelse (sb->u.ext2_sb.s_sbh);
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unlock_super (sb);
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return;
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}
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static struct super_operations ext2_sops = {
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ext2_read_inode,
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NULL,
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ext2_write_inode,
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ext2_put_inode,
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ext2_put_super,
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ext2_write_super,
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ext2_statfs,
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ext2_remount
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};
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#ifdef EXT2FS_PRE_02B_COMPAT
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static int convert_pre_02b_fs (struct super_block * sb,
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struct buffer_head * bh)
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{
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struct ext2_super_block * es;
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struct ext2_old_group_desc old_group_desc [BLOCK_SIZE / sizeof (struct ext2_old_group_desc)];
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struct ext2_group_desc * gdp;
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struct buffer_head * bh2;
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int groups_count;
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int i;
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es = (struct ext2_super_block *) bh->b_data;
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bh2 = bread (sb->s_dev, 2, BLOCK_SIZE);
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if (!bh2) {
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printk ("Cannot read descriptor blocks while converting !\n");
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return 0;
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}
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memcpy (old_group_desc, bh2->b_data, BLOCK_SIZE);
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groups_count = (sb->u.ext2_sb.s_blocks_count -
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sb->u.ext2_sb.s_first_data_block +
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(EXT2_BLOCK_SIZE(sb) * 8) - 1) /
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(EXT2_BLOCK_SIZE(sb) * 8);
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memset (bh2->b_data, 0, BLOCK_SIZE);
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gdp = (struct ext2_group_desc *) bh2->b_data;
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for (i = 0; i < groups_count; i++) {
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gdp[i].bg_block_bitmap = old_group_desc[i].bg_block_bitmap;
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gdp[i].bg_inode_bitmap = old_group_desc[i].bg_inode_bitmap;
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gdp[i].bg_inode_table = old_group_desc[i].bg_inode_table;
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gdp[i].bg_free_blocks_count = old_group_desc[i].bg_free_blocks_count;
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gdp[i].bg_free_inodes_count = old_group_desc[i].bg_free_inodes_count;
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}
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mark_buffer_dirty(bh2, 1);
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brelse (bh2);
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es->s_magic = EXT2_SUPER_MAGIC;
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mark_buffer_dirty(bh, 1);
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sb->s_magic = EXT2_SUPER_MAGIC;
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return 1;
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}
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#endif
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/*
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* This function has been shamelessly adapted from the msdos fs
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*/
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static int parse_options (char * options, unsigned long * sb_block,
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unsigned short *resuid, unsigned short * resgid,
|
||||
unsigned long * mount_options)
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{
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||||
char * this_char;
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char * value;
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|
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if (!options)
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return 1;
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for (this_char = strtok (options, ",");
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this_char != NULL;
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this_char = strtok (NULL, ",")) {
|
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if ((value = strchr (this_char, '=')) != NULL)
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*value++ = 0;
|
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if (!strcmp (this_char, "bsddf"))
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clear_opt (*mount_options, MINIX_DF);
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else if (!strcmp (this_char, "check")) {
|
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if (!value || !*value)
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set_opt (*mount_options, CHECK_NORMAL);
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else if (!strcmp (value, "none")) {
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clear_opt (*mount_options, CHECK_NORMAL);
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clear_opt (*mount_options, CHECK_STRICT);
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}
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else if (strcmp (value, "normal"))
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set_opt (*mount_options, CHECK_NORMAL);
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else if (strcmp (value, "strict")) {
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set_opt (*mount_options, CHECK_NORMAL);
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set_opt (*mount_options, CHECK_STRICT);
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}
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else {
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printk ("EXT2-fs: Invalid check option: %s\n",
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value);
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return 0;
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}
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}
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else if (!strcmp (this_char, "debug"))
|
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set_opt (*mount_options, DEBUG);
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else if (!strcmp (this_char, "errors")) {
|
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if (!value || !*value) {
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printk ("EXT2-fs: the errors option requires "
|
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"an argument");
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return 0;
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}
|
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if (!strcmp (value, "continue")) {
|
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clear_opt (*mount_options, ERRORS_RO);
|
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clear_opt (*mount_options, ERRORS_PANIC);
|
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set_opt (*mount_options, ERRORS_CONT);
|
||||
}
|
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else if (!strcmp (value, "remount-ro")) {
|
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clear_opt (*mount_options, ERRORS_CONT);
|
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clear_opt (*mount_options, ERRORS_PANIC);
|
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set_opt (*mount_options, ERRORS_RO);
|
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}
|
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else if (!strcmp (value, "panic")) {
|
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clear_opt (*mount_options, ERRORS_CONT);
|
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clear_opt (*mount_options, ERRORS_RO);
|
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set_opt (*mount_options, ERRORS_PANIC);
|
||||
}
|
||||
else {
|
||||
printk ("EXT2-fs: Invalid errors option: %s\n",
|
||||
value);
|
||||
return 0;
|
||||
}
|
||||
}
|
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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 */
|
||||
}
|
||||
Loading…
Reference in New Issue