| 1 |
1275 |
phoenix |
/*
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| 2 |
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* linux/fs/ext2/super.c
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| 3 |
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*
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| 4 |
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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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| 15 |
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* Big-endian to little-endian byte-swapping/bitmaps by
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* David S. Miller (davem@caip.rutgers.edu), 1995
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*/
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#include <linux/config.h>
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| 20 |
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#include <linux/module.h>
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| 21 |
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#include <linux/string.h>
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| 22 |
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#include <linux/fs.h>
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| 23 |
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#include <linux/ext2_fs.h>
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| 24 |
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#include <linux/slab.h>
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| 25 |
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#include <linux/init.h>
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#include <linux/locks.h>
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| 27 |
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#include <linux/blkdev.h>
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#include <asm/uaccess.h>
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| 29 |
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| 30 |
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static void ext2_sync_super(struct super_block *sb,
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struct ext2_super_block *es);
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| 34 |
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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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struct ext2_super_block *es = EXT2_SB(sb)->s_es;
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| 42 |
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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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es->s_state =
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cpu_to_le16(le16_to_cpu(es->s_state) | EXT2_ERROR_FS);
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ext2_sync_super(sb, es);
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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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(le16_to_cpu(sb->u.ext2_sb.s_es->s_errors) == EXT2_ERRORS_PANIC &&
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| 53 |
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!test_opt (sb, ERRORS_CONT) && !test_opt (sb, ERRORS_RO)))
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panic ("EXT2-fs panic (device %s): %s: %s\n",
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bdevname(sb->s_dev), function, error_buf);
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printk (KERN_CRIT "EXT2-fs error (device %s): %s: %s\n",
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bdevname(sb->s_dev), function, error_buf);
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if (test_opt (sb, ERRORS_RO) ||
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(le16_to_cpu(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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| 71 |
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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 =
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cpu_to_le16(le16_to_cpu(sb->u.ext2_sb.s_es->s_state) | EXT2_ERROR_FS);
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mark_buffer_dirty(sb->u.ext2_sb.s_sbh);
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sb->s_dirt = 1;
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}
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| 78 |
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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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sb->s_flags |= MS_RDONLY;
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panic ("EXT2-fs panic (device %s): %s: %s\n",
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bdevname(sb->s_dev), function, error_buf);
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}
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| 86 |
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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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| 89 |
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va_list args;
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| 90 |
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| 91 |
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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 %s): %s: %s\n",
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bdevname(sb->s_dev), function, error_buf);
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}
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| 98 |
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void ext2_update_dynamic_rev(struct super_block *sb)
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{
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| 100 |
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struct ext2_super_block *es = EXT2_SB(sb)->s_es;
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| 101 |
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| 102 |
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if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV)
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return;
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| 104 |
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| 105 |
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ext2_warning(sb, __FUNCTION__,
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| 106 |
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"updating to rev %d because of new feature flag, "
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"running e2fsck is recommended",
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EXT2_DYNAMIC_REV);
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| 109 |
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| 110 |
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es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO);
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es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE);
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es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV);
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/* leave es->s_feature_*compat flags alone */
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/* es->s_uuid will be set by e2fsck if empty */
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| 115 |
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| 116 |
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/*
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* The rest of the superblock fields should be zero, and if not it
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| 118 |
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* means they are likely already in use, so leave them alone. We
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| 119 |
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* can leave it up to e2fsck to clean up any inconsistencies there.
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*/
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| 121 |
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}
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| 122 |
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| 123 |
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void ext2_put_super (struct super_block * sb)
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| 124 |
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{
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| 125 |
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int db_count;
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| 126 |
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int i;
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| 127 |
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| 128 |
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if (!(sb->s_flags & MS_RDONLY)) {
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| 129 |
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struct ext2_super_block *es = EXT2_SB(sb)->s_es;
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| 130 |
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| 131 |
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es->s_state = le16_to_cpu(EXT2_SB(sb)->s_mount_state);
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| 132 |
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ext2_sync_super(sb, es);
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| 133 |
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}
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| 134 |
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db_count = EXT2_SB(sb)->s_gdb_count;
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| 135 |
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for (i = 0; i < db_count; i++)
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| 136 |
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if (sb->u.ext2_sb.s_group_desc[i])
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| 137 |
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brelse (sb->u.ext2_sb.s_group_desc[i]);
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| 138 |
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kfree(sb->u.ext2_sb.s_group_desc);
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| 139 |
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for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
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| 140 |
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if (sb->u.ext2_sb.s_inode_bitmap[i])
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| 141 |
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brelse (sb->u.ext2_sb.s_inode_bitmap[i]);
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| 142 |
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for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
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| 143 |
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if (sb->u.ext2_sb.s_block_bitmap[i])
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| 144 |
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brelse (sb->u.ext2_sb.s_block_bitmap[i]);
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| 145 |
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brelse (sb->u.ext2_sb.s_sbh);
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| 146 |
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| 147 |
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return;
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| 148 |
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}
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| 149 |
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| 150 |
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static struct super_operations ext2_sops = {
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| 151 |
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read_inode: ext2_read_inode,
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write_inode: ext2_write_inode,
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put_inode: ext2_put_inode,
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| 154 |
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delete_inode: ext2_delete_inode,
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put_super: ext2_put_super,
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| 156 |
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write_super: ext2_write_super,
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| 157 |
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statfs: ext2_statfs,
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remount_fs: ext2_remount,
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| 159 |
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};
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| 160 |
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| 161 |
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/*
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| 162 |
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* This function has been shamelessly adapted from the msdos fs
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| 163 |
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*/
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| 164 |
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static int parse_options (char * options, unsigned long * sb_block,
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| 165 |
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unsigned short *resuid, unsigned short * resgid,
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| 166 |
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unsigned long * mount_options)
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| 167 |
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{
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| 168 |
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char * this_char;
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| 169 |
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char * value;
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| 170 |
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| 171 |
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if (!options)
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| 172 |
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return 1;
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| 173 |
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for (this_char = strtok (options, ",");
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| 174 |
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this_char != NULL;
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| 175 |
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this_char = strtok (NULL, ",")) {
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| 176 |
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if ((value = strchr (this_char, '=')) != NULL)
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| 177 |
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*value++ = 0;
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| 178 |
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if (!strcmp (this_char, "bsddf"))
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| 179 |
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clear_opt (*mount_options, MINIX_DF);
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| 180 |
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else if (!strcmp (this_char, "nouid32")) {
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| 181 |
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set_opt (*mount_options, NO_UID32);
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| 182 |
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}
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| 183 |
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else if (!strcmp (this_char, "check")) {
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| 184 |
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if (!value || !*value || !strcmp (value, "none"))
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| 185 |
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clear_opt (*mount_options, CHECK);
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| 186 |
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else
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| 187 |
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#ifdef CONFIG_EXT2_CHECK
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| 188 |
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set_opt (*mount_options, CHECK);
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| 189 |
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#else
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| 190 |
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printk("EXT2 Check option not supported\n");
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| 191 |
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#endif
|
| 192 |
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}
|
| 193 |
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else if (!strcmp (this_char, "debug"))
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| 194 |
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set_opt (*mount_options, DEBUG);
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| 195 |
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else if (!strcmp (this_char, "errors")) {
|
| 196 |
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if (!value || !*value) {
|
| 197 |
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printk ("EXT2-fs: the errors option requires "
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| 198 |
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"an argument\n");
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| 199 |
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return 0;
|
| 200 |
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}
|
| 201 |
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if (!strcmp (value, "continue")) {
|
| 202 |
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clear_opt (*mount_options, ERRORS_RO);
|
| 203 |
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clear_opt (*mount_options, ERRORS_PANIC);
|
| 204 |
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set_opt (*mount_options, ERRORS_CONT);
|
| 205 |
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}
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| 206 |
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else if (!strcmp (value, "remount-ro")) {
|
| 207 |
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clear_opt (*mount_options, ERRORS_CONT);
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| 208 |
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clear_opt (*mount_options, ERRORS_PANIC);
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| 209 |
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set_opt (*mount_options, ERRORS_RO);
|
| 210 |
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}
|
| 211 |
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else if (!strcmp (value, "panic")) {
|
| 212 |
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clear_opt (*mount_options, ERRORS_CONT);
|
| 213 |
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clear_opt (*mount_options, ERRORS_RO);
|
| 214 |
|
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set_opt (*mount_options, ERRORS_PANIC);
|
| 215 |
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}
|
| 216 |
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else {
|
| 217 |
|
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printk ("EXT2-fs: Invalid errors option: %s\n",
|
| 218 |
|
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value);
|
| 219 |
|
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return 0;
|
| 220 |
|
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}
|
| 221 |
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}
|
| 222 |
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else if (!strcmp (this_char, "grpid") ||
|
| 223 |
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!strcmp (this_char, "bsdgroups"))
|
| 224 |
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set_opt (*mount_options, GRPID);
|
| 225 |
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else if (!strcmp (this_char, "minixdf"))
|
| 226 |
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set_opt (*mount_options, MINIX_DF);
|
| 227 |
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else if (!strcmp (this_char, "nocheck"))
|
| 228 |
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clear_opt (*mount_options, CHECK);
|
| 229 |
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else if (!strcmp (this_char, "nogrpid") ||
|
| 230 |
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!strcmp (this_char, "sysvgroups"))
|
| 231 |
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clear_opt (*mount_options, GRPID);
|
| 232 |
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else if (!strcmp (this_char, "resgid")) {
|
| 233 |
|
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if (!value || !*value) {
|
| 234 |
|
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printk ("EXT2-fs: the resgid option requires "
|
| 235 |
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"an argument\n");
|
| 236 |
|
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return 0;
|
| 237 |
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}
|
| 238 |
|
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*resgid = simple_strtoul (value, &value, 0);
|
| 239 |
|
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if (*value) {
|
| 240 |
|
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printk ("EXT2-fs: Invalid resgid option: %s\n",
|
| 241 |
|
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value);
|
| 242 |
|
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return 0;
|
| 243 |
|
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}
|
| 244 |
|
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}
|
| 245 |
|
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else if (!strcmp (this_char, "resuid")) {
|
| 246 |
|
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if (!value || !*value) {
|
| 247 |
|
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printk ("EXT2-fs: the resuid option requires "
|
| 248 |
|
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"an argument");
|
| 249 |
|
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return 0;
|
| 250 |
|
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}
|
| 251 |
|
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*resuid = simple_strtoul (value, &value, 0);
|
| 252 |
|
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if (*value) {
|
| 253 |
|
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printk ("EXT2-fs: Invalid resuid option: %s\n",
|
| 254 |
|
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value);
|
| 255 |
|
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return 0;
|
| 256 |
|
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}
|
| 257 |
|
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}
|
| 258 |
|
|
else if (!strcmp (this_char, "sb")) {
|
| 259 |
|
|
if (!value || !*value) {
|
| 260 |
|
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printk ("EXT2-fs: the sb option requires "
|
| 261 |
|
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"an argument");
|
| 262 |
|
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return 0;
|
| 263 |
|
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}
|
| 264 |
|
|
*sb_block = simple_strtoul (value, &value, 0);
|
| 265 |
|
|
if (*value) {
|
| 266 |
|
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printk ("EXT2-fs: Invalid sb option: %s\n",
|
| 267 |
|
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value);
|
| 268 |
|
|
return 0;
|
| 269 |
|
|
}
|
| 270 |
|
|
}
|
| 271 |
|
|
/* Silently ignore the quota options */
|
| 272 |
|
|
else if (!strcmp (this_char, "grpquota")
|
| 273 |
|
|
|| !strcmp (this_char, "noquota")
|
| 274 |
|
|
|| !strcmp (this_char, "quota")
|
| 275 |
|
|
|| !strcmp (this_char, "usrquota"))
|
| 276 |
|
|
/* Don't do anything ;-) */ ;
|
| 277 |
|
|
else {
|
| 278 |
|
|
printk ("EXT2-fs: Unrecognized mount option %s\n", this_char);
|
| 279 |
|
|
return 0;
|
| 280 |
|
|
}
|
| 281 |
|
|
}
|
| 282 |
|
|
return 1;
|
| 283 |
|
|
}
|
| 284 |
|
|
|
| 285 |
|
|
static int ext2_setup_super (struct super_block * sb,
|
| 286 |
|
|
struct ext2_super_block * es,
|
| 287 |
|
|
int read_only)
|
| 288 |
|
|
{
|
| 289 |
|
|
int res = 0;
|
| 290 |
|
|
if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
|
| 291 |
|
|
printk ("EXT2-fs warning: revision level too high, "
|
| 292 |
|
|
"forcing read-only mode\n");
|
| 293 |
|
|
res = MS_RDONLY;
|
| 294 |
|
|
}
|
| 295 |
|
|
if (read_only)
|
| 296 |
|
|
return res;
|
| 297 |
|
|
if (!(sb->u.ext2_sb.s_mount_state & EXT2_VALID_FS))
|
| 298 |
|
|
printk ("EXT2-fs warning: mounting unchecked fs, "
|
| 299 |
|
|
"running e2fsck is recommended\n");
|
| 300 |
|
|
else if ((sb->u.ext2_sb.s_mount_state & EXT2_ERROR_FS))
|
| 301 |
|
|
printk ("EXT2-fs warning: mounting fs with errors, "
|
| 302 |
|
|
"running e2fsck is recommended\n");
|
| 303 |
|
|
else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
|
| 304 |
|
|
le16_to_cpu(es->s_mnt_count) >=
|
| 305 |
|
|
(unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
|
| 306 |
|
|
printk ("EXT2-fs warning: maximal mount count reached, "
|
| 307 |
|
|
"running e2fsck is recommended\n");
|
| 308 |
|
|
else if (le32_to_cpu(es->s_checkinterval) &&
|
| 309 |
|
|
(le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= CURRENT_TIME))
|
| 310 |
|
|
printk ("EXT2-fs warning: checktime reached, "
|
| 311 |
|
|
"running e2fsck is recommended\n");
|
| 312 |
|
|
if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
|
| 313 |
|
|
es->s_max_mnt_count = (__s16) cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
|
| 314 |
|
|
es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
|
| 315 |
|
|
ext2_write_super(sb);
|
| 316 |
|
|
if (test_opt (sb, DEBUG))
|
| 317 |
|
|
printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
|
| 318 |
|
|
"bpg=%lu, ipg=%lu, mo=%04lx]\n",
|
| 319 |
|
|
EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
|
| 320 |
|
|
sb->u.ext2_sb.s_frag_size,
|
| 321 |
|
|
sb->u.ext2_sb.s_groups_count,
|
| 322 |
|
|
EXT2_BLOCKS_PER_GROUP(sb),
|
| 323 |
|
|
EXT2_INODES_PER_GROUP(sb),
|
| 324 |
|
|
sb->u.ext2_sb.s_mount_opt);
|
| 325 |
|
|
#ifdef CONFIG_EXT2_CHECK
|
| 326 |
|
|
if (test_opt (sb, CHECK)) {
|
| 327 |
|
|
ext2_check_blocks_bitmap (sb);
|
| 328 |
|
|
ext2_check_inodes_bitmap (sb);
|
| 329 |
|
|
}
|
| 330 |
|
|
#endif
|
| 331 |
|
|
return res;
|
| 332 |
|
|
}
|
| 333 |
|
|
|
| 334 |
|
|
static int ext2_check_descriptors (struct super_block * sb)
|
| 335 |
|
|
{
|
| 336 |
|
|
int i;
|
| 337 |
|
|
int desc_block = 0;
|
| 338 |
|
|
unsigned long block = le32_to_cpu(sb->u.ext2_sb.s_es->s_first_data_block);
|
| 339 |
|
|
struct ext2_group_desc * gdp = NULL;
|
| 340 |
|
|
|
| 341 |
|
|
ext2_debug ("Checking group descriptors");
|
| 342 |
|
|
|
| 343 |
|
|
for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++)
|
| 344 |
|
|
{
|
| 345 |
|
|
if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
|
| 346 |
|
|
gdp = (struct ext2_group_desc *) sb->u.ext2_sb.s_group_desc[desc_block++]->b_data;
|
| 347 |
|
|
if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
|
| 348 |
|
|
le32_to_cpu(gdp->bg_block_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb))
|
| 349 |
|
|
{
|
| 350 |
|
|
ext2_error (sb, "ext2_check_descriptors",
|
| 351 |
|
|
"Block bitmap for group %d"
|
| 352 |
|
|
" not in group (block %lu)!",
|
| 353 |
|
|
i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap));
|
| 354 |
|
|
return 0;
|
| 355 |
|
|
}
|
| 356 |
|
|
if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
|
| 357 |
|
|
le32_to_cpu(gdp->bg_inode_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb))
|
| 358 |
|
|
{
|
| 359 |
|
|
ext2_error (sb, "ext2_check_descriptors",
|
| 360 |
|
|
"Inode bitmap for group %d"
|
| 361 |
|
|
" not in group (block %lu)!",
|
| 362 |
|
|
i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap));
|
| 363 |
|
|
return 0;
|
| 364 |
|
|
}
|
| 365 |
|
|
if (le32_to_cpu(gdp->bg_inode_table) < block ||
|
| 366 |
|
|
le32_to_cpu(gdp->bg_inode_table) + sb->u.ext2_sb.s_itb_per_group >=
|
| 367 |
|
|
block + EXT2_BLOCKS_PER_GROUP(sb))
|
| 368 |
|
|
{
|
| 369 |
|
|
ext2_error (sb, "ext2_check_descriptors",
|
| 370 |
|
|
"Inode table for group %d"
|
| 371 |
|
|
" not in group (block %lu)!",
|
| 372 |
|
|
i, (unsigned long) le32_to_cpu(gdp->bg_inode_table));
|
| 373 |
|
|
return 0;
|
| 374 |
|
|
}
|
| 375 |
|
|
block += EXT2_BLOCKS_PER_GROUP(sb);
|
| 376 |
|
|
gdp++;
|
| 377 |
|
|
}
|
| 378 |
|
|
return 1;
|
| 379 |
|
|
}
|
| 380 |
|
|
|
| 381 |
|
|
#define log2(n) ffz(~(n))
|
| 382 |
|
|
|
| 383 |
|
|
/*
|
| 384 |
|
|
* Maximal file size. There is a direct, and {,double-,triple-}indirect
|
| 385 |
|
|
* block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
|
| 386 |
|
|
* We need to be 1 filesystem block less than the 2^32 sector limit.
|
| 387 |
|
|
*/
|
| 388 |
|
|
static loff_t ext2_max_size(int bits)
|
| 389 |
|
|
{
|
| 390 |
|
|
loff_t res = EXT2_NDIR_BLOCKS;
|
| 391 |
|
|
res += 1LL << (bits-2);
|
| 392 |
|
|
res += 1LL << (2*(bits-2));
|
| 393 |
|
|
res += 1LL << (3*(bits-2));
|
| 394 |
|
|
res <<= bits;
|
| 395 |
|
|
if (res > (512LL << 32) - (1 << bits))
|
| 396 |
|
|
res = (512LL << 32) - (1 << bits);
|
| 397 |
|
|
return res;
|
| 398 |
|
|
}
|
| 399 |
|
|
|
| 400 |
|
|
static unsigned long descriptor_loc(struct super_block *sb,
|
| 401 |
|
|
unsigned long logic_sb_block,
|
| 402 |
|
|
int nr)
|
| 403 |
|
|
{
|
| 404 |
|
|
struct ext2_sb_info *sbi = EXT2_SB(sb);
|
| 405 |
|
|
unsigned long bg, first_data_block, first_meta_bg;
|
| 406 |
|
|
int has_super = 0;
|
| 407 |
|
|
|
| 408 |
|
|
first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
|
| 409 |
|
|
first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
|
| 410 |
|
|
|
| 411 |
|
|
if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
|
| 412 |
|
|
nr < first_meta_bg)
|
| 413 |
|
|
return (logic_sb_block + nr + 1);
|
| 414 |
|
|
bg = sbi->s_desc_per_block * nr;
|
| 415 |
|
|
if (ext2_bg_has_super(sb, bg))
|
| 416 |
|
|
has_super = 1;
|
| 417 |
|
|
return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
|
| 418 |
|
|
}
|
| 419 |
|
|
|
| 420 |
|
|
struct super_block * ext2_read_super (struct super_block * sb, void * data,
|
| 421 |
|
|
int silent)
|
| 422 |
|
|
{
|
| 423 |
|
|
struct buffer_head * bh;
|
| 424 |
|
|
struct ext2_sb_info * sbi = EXT2_SB(sb);
|
| 425 |
|
|
struct ext2_super_block * es;
|
| 426 |
|
|
unsigned long sb_block = 1;
|
| 427 |
|
|
unsigned short resuid = EXT2_DEF_RESUID;
|
| 428 |
|
|
unsigned short resgid = EXT2_DEF_RESGID;
|
| 429 |
|
|
unsigned long block;
|
| 430 |
|
|
unsigned long logic_sb_block = 1;
|
| 431 |
|
|
unsigned long offset = 0;
|
| 432 |
|
|
kdev_t dev = sb->s_dev;
|
| 433 |
|
|
int blocksize = BLOCK_SIZE;
|
| 434 |
|
|
int db_count;
|
| 435 |
|
|
int i, j;
|
| 436 |
|
|
|
| 437 |
|
|
/*
|
| 438 |
|
|
* See what the current blocksize for the device is, and
|
| 439 |
|
|
* use that as the blocksize. Otherwise (or if the blocksize
|
| 440 |
|
|
* is smaller than the default) use the default.
|
| 441 |
|
|
* This is important for devices that have a hardware
|
| 442 |
|
|
* sectorsize that is larger than the default.
|
| 443 |
|
|
*/
|
| 444 |
|
|
blocksize = get_hardsect_size(dev);
|
| 445 |
|
|
if(blocksize < BLOCK_SIZE )
|
| 446 |
|
|
blocksize = BLOCK_SIZE;
|
| 447 |
|
|
|
| 448 |
|
|
sb->u.ext2_sb.s_mount_opt = 0;
|
| 449 |
|
|
if (!parse_options ((char *) data, &sb_block, &resuid, &resgid,
|
| 450 |
|
|
&sb->u.ext2_sb.s_mount_opt)) {
|
| 451 |
|
|
return NULL;
|
| 452 |
|
|
}
|
| 453 |
|
|
|
| 454 |
|
|
if (set_blocksize(dev, blocksize) < 0) {
|
| 455 |
|
|
printk ("EXT2-fs: unable to set blocksize %d\n", blocksize);
|
| 456 |
|
|
return NULL;
|
| 457 |
|
|
}
|
| 458 |
|
|
sb->s_blocksize = blocksize;
|
| 459 |
|
|
|
| 460 |
|
|
/*
|
| 461 |
|
|
* If the superblock doesn't start on a sector boundary,
|
| 462 |
|
|
* calculate the offset. FIXME(eric) this doesn't make sense
|
| 463 |
|
|
* that we would have to do this.
|
| 464 |
|
|
*/
|
| 465 |
|
|
if (blocksize != BLOCK_SIZE) {
|
| 466 |
|
|
logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
|
| 467 |
|
|
offset = (sb_block*BLOCK_SIZE) % blocksize;
|
| 468 |
|
|
}
|
| 469 |
|
|
|
| 470 |
|
|
if (!(bh = sb_bread(sb, logic_sb_block))) {
|
| 471 |
|
|
printk ("EXT2-fs: unable to read superblock\n");
|
| 472 |
|
|
return NULL;
|
| 473 |
|
|
}
|
| 474 |
|
|
/*
|
| 475 |
|
|
* Note: s_es must be initialized as soon as possible because
|
| 476 |
|
|
* some ext2 macro-instructions depend on its value
|
| 477 |
|
|
*/
|
| 478 |
|
|
es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
|
| 479 |
|
|
sb->u.ext2_sb.s_es = es;
|
| 480 |
|
|
sb->s_magic = le16_to_cpu(es->s_magic);
|
| 481 |
|
|
if (sb->s_magic != EXT2_SUPER_MAGIC) {
|
| 482 |
|
|
if (!silent)
|
| 483 |
|
|
printk ("VFS: Can't find ext2 filesystem on dev %s.\n",
|
| 484 |
|
|
bdevname(dev));
|
| 485 |
|
|
goto failed_mount;
|
| 486 |
|
|
}
|
| 487 |
|
|
if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
|
| 488 |
|
|
(EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
|
| 489 |
|
|
EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
|
| 490 |
|
|
EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
|
| 491 |
|
|
printk("EXT2-fs warning: feature flags set on rev 0 fs, "
|
| 492 |
|
|
"running e2fsck is recommended\n");
|
| 493 |
|
|
/*
|
| 494 |
|
|
* Check feature flags regardless of the revision level, since we
|
| 495 |
|
|
* previously didn't change the revision level when setting the flags,
|
| 496 |
|
|
* so there is a chance incompat flags are set on a rev 0 filesystem.
|
| 497 |
|
|
*/
|
| 498 |
|
|
if ((i = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))) {
|
| 499 |
|
|
printk("EXT2-fs: %s: couldn't mount because of "
|
| 500 |
|
|
"unsupported optional features (%x).\n",
|
| 501 |
|
|
bdevname(dev), i);
|
| 502 |
|
|
goto failed_mount;
|
| 503 |
|
|
}
|
| 504 |
|
|
if (!(sb->s_flags & MS_RDONLY) &&
|
| 505 |
|
|
(i = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
|
| 506 |
|
|
printk("EXT2-fs: %s: couldn't mount RDWR because of "
|
| 507 |
|
|
"unsupported optional features (%x).\n",
|
| 508 |
|
|
bdevname(dev), i);
|
| 509 |
|
|
goto failed_mount;
|
| 510 |
|
|
}
|
| 511 |
|
|
if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
|
| 512 |
|
|
ext2_warning(sb, __FUNCTION__,
|
| 513 |
|
|
"mounting ext3 filesystem as ext2\n");
|
| 514 |
|
|
sb->s_blocksize_bits =
|
| 515 |
|
|
le32_to_cpu(EXT2_SB(sb)->s_es->s_log_block_size) + 10;
|
| 516 |
|
|
sb->s_blocksize = 1 << sb->s_blocksize_bits;
|
| 517 |
|
|
|
| 518 |
|
|
sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
|
| 519 |
|
|
|
| 520 |
|
|
/* If the blocksize doesn't match, re-read the thing.. */
|
| 521 |
|
|
if (sb->s_blocksize != blocksize) {
|
| 522 |
|
|
blocksize = sb->s_blocksize;
|
| 523 |
|
|
brelse(bh);
|
| 524 |
|
|
|
| 525 |
|
|
if (set_blocksize(dev, blocksize) < 0) {
|
| 526 |
|
|
printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n");
|
| 527 |
|
|
return NULL;
|
| 528 |
|
|
}
|
| 529 |
|
|
|
| 530 |
|
|
logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
|
| 531 |
|
|
offset = (sb_block*BLOCK_SIZE) % blocksize;
|
| 532 |
|
|
bh = sb_bread(sb, logic_sb_block);
|
| 533 |
|
|
if(!bh) {
|
| 534 |
|
|
printk("EXT2-fs: Couldn't read superblock on "
|
| 535 |
|
|
"2nd try.\n");
|
| 536 |
|
|
goto failed_mount;
|
| 537 |
|
|
}
|
| 538 |
|
|
es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
|
| 539 |
|
|
sb->u.ext2_sb.s_es = es;
|
| 540 |
|
|
if (es->s_magic != le16_to_cpu(EXT2_SUPER_MAGIC)) {
|
| 541 |
|
|
printk ("EXT2-fs: Magic mismatch, very weird !\n");
|
| 542 |
|
|
goto failed_mount;
|
| 543 |
|
|
}
|
| 544 |
|
|
}
|
| 545 |
|
|
|
| 546 |
|
|
if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
|
| 547 |
|
|
sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
|
| 548 |
|
|
sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
|
| 549 |
|
|
} else {
|
| 550 |
|
|
sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
|
| 551 |
|
|
sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
|
| 552 |
|
|
if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
|
| 553 |
|
|
(sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
|
| 554 |
|
|
(sbi->s_inode_size > blocksize)) {
|
| 555 |
|
|
printk ("EXT2-fs: unsupported inode size: %d\n",
|
| 556 |
|
|
sbi->s_inode_size);
|
| 557 |
|
|
goto failed_mount;
|
| 558 |
|
|
}
|
| 559 |
|
|
}
|
| 560 |
|
|
sb->u.ext2_sb.s_frag_size = EXT2_MIN_FRAG_SIZE <<
|
| 561 |
|
|
le32_to_cpu(es->s_log_frag_size);
|
| 562 |
|
|
if (sb->u.ext2_sb.s_frag_size)
|
| 563 |
|
|
sb->u.ext2_sb.s_frags_per_block = sb->s_blocksize /
|
| 564 |
|
|
sb->u.ext2_sb.s_frag_size;
|
| 565 |
|
|
else
|
| 566 |
|
|
sb->s_magic = 0;
|
| 567 |
|
|
sb->u.ext2_sb.s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
|
| 568 |
|
|
sb->u.ext2_sb.s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
|
| 569 |
|
|
sb->u.ext2_sb.s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
|
| 570 |
|
|
sb->u.ext2_sb.s_inodes_per_block = sb->s_blocksize /
|
| 571 |
|
|
EXT2_INODE_SIZE(sb);
|
| 572 |
|
|
sb->u.ext2_sb.s_itb_per_group = sb->u.ext2_sb.s_inodes_per_group /
|
| 573 |
|
|
sb->u.ext2_sb.s_inodes_per_block;
|
| 574 |
|
|
sb->u.ext2_sb.s_desc_per_block = sb->s_blocksize /
|
| 575 |
|
|
sizeof (struct ext2_group_desc);
|
| 576 |
|
|
sb->u.ext2_sb.s_sbh = bh;
|
| 577 |
|
|
if (resuid != EXT2_DEF_RESUID)
|
| 578 |
|
|
sb->u.ext2_sb.s_resuid = resuid;
|
| 579 |
|
|
else
|
| 580 |
|
|
sb->u.ext2_sb.s_resuid = le16_to_cpu(es->s_def_resuid);
|
| 581 |
|
|
if (resgid != EXT2_DEF_RESGID)
|
| 582 |
|
|
sb->u.ext2_sb.s_resgid = resgid;
|
| 583 |
|
|
else
|
| 584 |
|
|
sb->u.ext2_sb.s_resgid = le16_to_cpu(es->s_def_resgid);
|
| 585 |
|
|
sb->u.ext2_sb.s_mount_state = le16_to_cpu(es->s_state);
|
| 586 |
|
|
sb->u.ext2_sb.s_addr_per_block_bits =
|
| 587 |
|
|
log2 (EXT2_ADDR_PER_BLOCK(sb));
|
| 588 |
|
|
sb->u.ext2_sb.s_desc_per_block_bits =
|
| 589 |
|
|
log2 (EXT2_DESC_PER_BLOCK(sb));
|
| 590 |
|
|
if (sb->s_magic != EXT2_SUPER_MAGIC) {
|
| 591 |
|
|
if (!silent)
|
| 592 |
|
|
printk ("VFS: Can't find an ext2 filesystem on dev "
|
| 593 |
|
|
"%s.\n",
|
| 594 |
|
|
bdevname(dev));
|
| 595 |
|
|
goto failed_mount;
|
| 596 |
|
|
}
|
| 597 |
|
|
if (sb->s_blocksize != bh->b_size) {
|
| 598 |
|
|
if (!silent)
|
| 599 |
|
|
printk ("VFS: Unsupported blocksize on dev "
|
| 600 |
|
|
"%s.\n", bdevname(dev));
|
| 601 |
|
|
goto failed_mount;
|
| 602 |
|
|
}
|
| 603 |
|
|
|
| 604 |
|
|
if (sb->s_blocksize != sb->u.ext2_sb.s_frag_size) {
|
| 605 |
|
|
printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
|
| 606 |
|
|
sb->u.ext2_sb.s_frag_size, sb->s_blocksize);
|
| 607 |
|
|
goto failed_mount;
|
| 608 |
|
|
}
|
| 609 |
|
|
|
| 610 |
|
|
if (sb->u.ext2_sb.s_blocks_per_group > sb->s_blocksize * 8) {
|
| 611 |
|
|
printk ("EXT2-fs: #blocks per group too big: %lu\n",
|
| 612 |
|
|
sb->u.ext2_sb.s_blocks_per_group);
|
| 613 |
|
|
goto failed_mount;
|
| 614 |
|
|
}
|
| 615 |
|
|
if (sb->u.ext2_sb.s_frags_per_group > sb->s_blocksize * 8) {
|
| 616 |
|
|
printk ("EXT2-fs: #fragments per group too big: %lu\n",
|
| 617 |
|
|
sb->u.ext2_sb.s_frags_per_group);
|
| 618 |
|
|
goto failed_mount;
|
| 619 |
|
|
}
|
| 620 |
|
|
if (sb->u.ext2_sb.s_inodes_per_group > sb->s_blocksize * 8) {
|
| 621 |
|
|
printk ("EXT2-fs: #inodes per group too big: %lu\n",
|
| 622 |
|
|
sb->u.ext2_sb.s_inodes_per_group);
|
| 623 |
|
|
goto failed_mount;
|
| 624 |
|
|
}
|
| 625 |
|
|
|
| 626 |
|
|
sb->u.ext2_sb.s_groups_count = (le32_to_cpu(es->s_blocks_count) -
|
| 627 |
|
|
le32_to_cpu(es->s_first_data_block) +
|
| 628 |
|
|
EXT2_BLOCKS_PER_GROUP(sb) - 1) /
|
| 629 |
|
|
EXT2_BLOCKS_PER_GROUP(sb);
|
| 630 |
|
|
db_count = (sb->u.ext2_sb.s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
|
| 631 |
|
|
EXT2_DESC_PER_BLOCK(sb);
|
| 632 |
|
|
sb->u.ext2_sb.s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
|
| 633 |
|
|
if (sb->u.ext2_sb.s_group_desc == NULL) {
|
| 634 |
|
|
printk ("EXT2-fs: not enough memory\n");
|
| 635 |
|
|
goto failed_mount;
|
| 636 |
|
|
}
|
| 637 |
|
|
for (i = 0; i < db_count; i++) {
|
| 638 |
|
|
block = descriptor_loc(sb, logic_sb_block, i);
|
| 639 |
|
|
sbi->s_group_desc[i] = sb_bread(sb, block);
|
| 640 |
|
|
if (!sbi->s_group_desc[i]) {
|
| 641 |
|
|
for (j = 0; j < i; j++)
|
| 642 |
|
|
brelse (sbi->s_group_desc[j]);
|
| 643 |
|
|
kfree(sbi->s_group_desc);
|
| 644 |
|
|
printk ("EXT2-fs: unable to read group descriptors\n");
|
| 645 |
|
|
goto failed_mount;
|
| 646 |
|
|
}
|
| 647 |
|
|
}
|
| 648 |
|
|
if (!ext2_check_descriptors (sb)) {
|
| 649 |
|
|
printk ("EXT2-fs: group descriptors corrupted!\n");
|
| 650 |
|
|
db_count = i;
|
| 651 |
|
|
goto failed_mount2;
|
| 652 |
|
|
}
|
| 653 |
|
|
for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
|
| 654 |
|
|
sb->u.ext2_sb.s_inode_bitmap_number[i] = 0;
|
| 655 |
|
|
sb->u.ext2_sb.s_inode_bitmap[i] = NULL;
|
| 656 |
|
|
sb->u.ext2_sb.s_block_bitmap_number[i] = 0;
|
| 657 |
|
|
sb->u.ext2_sb.s_block_bitmap[i] = NULL;
|
| 658 |
|
|
}
|
| 659 |
|
|
sb->u.ext2_sb.s_loaded_inode_bitmaps = 0;
|
| 660 |
|
|
sb->u.ext2_sb.s_loaded_block_bitmaps = 0;
|
| 661 |
|
|
sb->u.ext2_sb.s_gdb_count = db_count;
|
| 662 |
|
|
/*
|
| 663 |
|
|
* set up enough so that it can read an inode
|
| 664 |
|
|
*/
|
| 665 |
|
|
sb->s_op = &ext2_sops;
|
| 666 |
|
|
sb->s_root = d_alloc_root(iget(sb, EXT2_ROOT_INO));
|
| 667 |
|
|
if (!sb->s_root || !S_ISDIR(sb->s_root->d_inode->i_mode) ||
|
| 668 |
|
|
!sb->s_root->d_inode->i_blocks || !sb->s_root->d_inode->i_size) {
|
| 669 |
|
|
if (sb->s_root) {
|
| 670 |
|
|
dput(sb->s_root);
|
| 671 |
|
|
sb->s_root = NULL;
|
| 672 |
|
|
printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n");
|
| 673 |
|
|
} else
|
| 674 |
|
|
printk(KERN_ERR "EXT2-fs: get root inode failed\n");
|
| 675 |
|
|
goto failed_mount2;
|
| 676 |
|
|
}
|
| 677 |
|
|
ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY);
|
| 678 |
|
|
return sb;
|
| 679 |
|
|
failed_mount2:
|
| 680 |
|
|
for (i = 0; i < db_count; i++)
|
| 681 |
|
|
brelse(sb->u.ext2_sb.s_group_desc[i]);
|
| 682 |
|
|
kfree(sb->u.ext2_sb.s_group_desc);
|
| 683 |
|
|
failed_mount:
|
| 684 |
|
|
brelse(bh);
|
| 685 |
|
|
return NULL;
|
| 686 |
|
|
}
|
| 687 |
|
|
|
| 688 |
|
|
static void ext2_commit_super (struct super_block * sb,
|
| 689 |
|
|
struct ext2_super_block * es)
|
| 690 |
|
|
{
|
| 691 |
|
|
es->s_wtime = cpu_to_le32(CURRENT_TIME);
|
| 692 |
|
|
mark_buffer_dirty(sb->u.ext2_sb.s_sbh);
|
| 693 |
|
|
sb->s_dirt = 0;
|
| 694 |
|
|
}
|
| 695 |
|
|
|
| 696 |
|
|
static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es)
|
| 697 |
|
|
{
|
| 698 |
|
|
es->s_wtime = cpu_to_le32(CURRENT_TIME);
|
| 699 |
|
|
mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
|
| 700 |
|
|
ll_rw_block(WRITE, 1, &EXT2_SB(sb)->s_sbh);
|
| 701 |
|
|
wait_on_buffer(EXT2_SB(sb)->s_sbh);
|
| 702 |
|
|
sb->s_dirt = 0;
|
| 703 |
|
|
}
|
| 704 |
|
|
|
| 705 |
|
|
/*
|
| 706 |
|
|
* In the second extended file system, it is not necessary to
|
| 707 |
|
|
* write the super block since we use a mapping of the
|
| 708 |
|
|
* disk super block in a buffer.
|
| 709 |
|
|
*
|
| 710 |
|
|
* However, this function is still used to set the fs valid
|
| 711 |
|
|
* flags to 0. We need to set this flag to 0 since the fs
|
| 712 |
|
|
* may have been checked while mounted and e2fsck may have
|
| 713 |
|
|
* set s_state to EXT2_VALID_FS after some corrections.
|
| 714 |
|
|
*/
|
| 715 |
|
|
|
| 716 |
|
|
void ext2_write_super (struct super_block * sb)
|
| 717 |
|
|
{
|
| 718 |
|
|
struct ext2_super_block * es;
|
| 719 |
|
|
|
| 720 |
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
| 721 |
|
|
es = sb->u.ext2_sb.s_es;
|
| 722 |
|
|
|
| 723 |
|
|
if (le16_to_cpu(es->s_state) & EXT2_VALID_FS) {
|
| 724 |
|
|
ext2_debug ("setting valid to 0\n");
|
| 725 |
|
|
es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) &
|
| 726 |
|
|
~EXT2_VALID_FS);
|
| 727 |
|
|
es->s_mtime = cpu_to_le32(CURRENT_TIME);
|
| 728 |
|
|
ext2_sync_super(sb, es);
|
| 729 |
|
|
} else
|
| 730 |
|
|
ext2_commit_super (sb, es);
|
| 731 |
|
|
}
|
| 732 |
|
|
sb->s_dirt = 0;
|
| 733 |
|
|
}
|
| 734 |
|
|
|
| 735 |
|
|
int ext2_remount (struct super_block * sb, int * flags, char * data)
|
| 736 |
|
|
{
|
| 737 |
|
|
struct ext2_super_block * es;
|
| 738 |
|
|
unsigned short resuid = sb->u.ext2_sb.s_resuid;
|
| 739 |
|
|
unsigned short resgid = sb->u.ext2_sb.s_resgid;
|
| 740 |
|
|
unsigned long new_mount_opt;
|
| 741 |
|
|
unsigned long tmp;
|
| 742 |
|
|
|
| 743 |
|
|
/*
|
| 744 |
|
|
* Allow the "check" option to be passed as a remount option.
|
| 745 |
|
|
*/
|
| 746 |
|
|
new_mount_opt = sb->u.ext2_sb.s_mount_opt;
|
| 747 |
|
|
if (!parse_options (data, &tmp, &resuid, &resgid,
|
| 748 |
|
|
&new_mount_opt))
|
| 749 |
|
|
return -EINVAL;
|
| 750 |
|
|
|
| 751 |
|
|
sb->u.ext2_sb.s_mount_opt = new_mount_opt;
|
| 752 |
|
|
sb->u.ext2_sb.s_resuid = resuid;
|
| 753 |
|
|
sb->u.ext2_sb.s_resgid = resgid;
|
| 754 |
|
|
es = sb->u.ext2_sb.s_es;
|
| 755 |
|
|
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
|
| 756 |
|
|
return 0;
|
| 757 |
|
|
if (*flags & MS_RDONLY) {
|
| 758 |
|
|
if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
|
| 759 |
|
|
!(sb->u.ext2_sb.s_mount_state & EXT2_VALID_FS))
|
| 760 |
|
|
return 0;
|
| 761 |
|
|
/*
|
| 762 |
|
|
* OK, we are remounting a valid rw partition rdonly, so set
|
| 763 |
|
|
* the rdonly flag and then mark the partition as valid again.
|
| 764 |
|
|
*/
|
| 765 |
|
|
es->s_state = cpu_to_le16(sb->u.ext2_sb.s_mount_state);
|
| 766 |
|
|
es->s_mtime = cpu_to_le32(CURRENT_TIME);
|
| 767 |
|
|
} else {
|
| 768 |
|
|
int ret;
|
| 769 |
|
|
if ((ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
|
| 770 |
|
|
~EXT2_FEATURE_RO_COMPAT_SUPP))) {
|
| 771 |
|
|
printk("EXT2-fs: %s: couldn't remount RDWR because of "
|
| 772 |
|
|
"unsupported optional features (%x).\n",
|
| 773 |
|
|
bdevname(sb->s_dev), ret);
|
| 774 |
|
|
return -EROFS;
|
| 775 |
|
|
}
|
| 776 |
|
|
/*
|
| 777 |
|
|
* Mounting a RDONLY partition read-write, so reread and
|
| 778 |
|
|
* store the current valid flag. (It may have been changed
|
| 779 |
|
|
* by e2fsck since we originally mounted the partition.)
|
| 780 |
|
|
*/
|
| 781 |
|
|
sb->u.ext2_sb.s_mount_state = le16_to_cpu(es->s_state);
|
| 782 |
|
|
if (!ext2_setup_super (sb, es, 0))
|
| 783 |
|
|
sb->s_flags &= ~MS_RDONLY;
|
| 784 |
|
|
}
|
| 785 |
|
|
ext2_sync_super(sb, es);
|
| 786 |
|
|
return 0;
|
| 787 |
|
|
}
|
| 788 |
|
|
|
| 789 |
|
|
int ext2_statfs (struct super_block * sb, struct statfs * buf)
|
| 790 |
|
|
{
|
| 791 |
|
|
unsigned long overhead;
|
| 792 |
|
|
int i;
|
| 793 |
|
|
|
| 794 |
|
|
if (test_opt (sb, MINIX_DF))
|
| 795 |
|
|
overhead = 0;
|
| 796 |
|
|
else {
|
| 797 |
|
|
/*
|
| 798 |
|
|
* Compute the overhead (FS structures)
|
| 799 |
|
|
*/
|
| 800 |
|
|
|
| 801 |
|
|
/*
|
| 802 |
|
|
* All of the blocks before first_data_block are
|
| 803 |
|
|
* overhead
|
| 804 |
|
|
*/
|
| 805 |
|
|
overhead = le32_to_cpu(sb->u.ext2_sb.s_es->s_first_data_block);
|
| 806 |
|
|
|
| 807 |
|
|
/*
|
| 808 |
|
|
* Add the overhead attributed to the superblock and
|
| 809 |
|
|
* block group descriptors. If the sparse superblocks
|
| 810 |
|
|
* feature is turned on, then not all groups have this.
|
| 811 |
|
|
*/
|
| 812 |
|
|
for (i = 0; i < EXT2_SB(sb)->s_groups_count; i++)
|
| 813 |
|
|
overhead += ext2_bg_has_super(sb, i) +
|
| 814 |
|
|
ext2_bg_num_gdb(sb, i);
|
| 815 |
|
|
|
| 816 |
|
|
/*
|
| 817 |
|
|
* Every block group has an inode bitmap, a block
|
| 818 |
|
|
* bitmap, and an inode table.
|
| 819 |
|
|
*/
|
| 820 |
|
|
overhead += (sb->u.ext2_sb.s_groups_count *
|
| 821 |
|
|
(2 + sb->u.ext2_sb.s_itb_per_group));
|
| 822 |
|
|
}
|
| 823 |
|
|
|
| 824 |
|
|
buf->f_type = EXT2_SUPER_MAGIC;
|
| 825 |
|
|
buf->f_bsize = sb->s_blocksize;
|
| 826 |
|
|
buf->f_blocks = le32_to_cpu(sb->u.ext2_sb.s_es->s_blocks_count) - overhead;
|
| 827 |
|
|
buf->f_bfree = ext2_count_free_blocks (sb);
|
| 828 |
|
|
buf->f_bavail = buf->f_bfree - le32_to_cpu(sb->u.ext2_sb.s_es->s_r_blocks_count);
|
| 829 |
|
|
if (buf->f_bfree < le32_to_cpu(sb->u.ext2_sb.s_es->s_r_blocks_count))
|
| 830 |
|
|
buf->f_bavail = 0;
|
| 831 |
|
|
buf->f_files = le32_to_cpu(sb->u.ext2_sb.s_es->s_inodes_count);
|
| 832 |
|
|
buf->f_ffree = ext2_count_free_inodes (sb);
|
| 833 |
|
|
buf->f_namelen = EXT2_NAME_LEN;
|
| 834 |
|
|
return 0;
|
| 835 |
|
|
}
|
| 836 |
|
|
|
| 837 |
|
|
static DECLARE_FSTYPE_DEV(ext2_fs_type, "ext2", ext2_read_super);
|
| 838 |
|
|
|
| 839 |
|
|
static int __init init_ext2_fs(void)
|
| 840 |
|
|
{
|
| 841 |
|
|
return register_filesystem(&ext2_fs_type);
|
| 842 |
|
|
}
|
| 843 |
|
|
|
| 844 |
|
|
static void __exit exit_ext2_fs(void)
|
| 845 |
|
|
{
|
| 846 |
|
|
unregister_filesystem(&ext2_fs_type);
|
| 847 |
|
|
}
|
| 848 |
|
|
|
| 849 |
|
|
EXPORT_NO_SYMBOLS;
|
| 850 |
|
|
|
| 851 |
|
|
module_init(init_ext2_fs)
|
| 852 |
|
|
module_exit(exit_ext2_fs)
|
