1240 lines
34 KiB
C
1240 lines
34 KiB
C
/*
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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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* 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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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/parser.h>
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#include <linux/random.h>
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#include <linux/buffer_head.h>
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#include <linux/smp_lock.h>
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#include <linux/vfs.h>
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#include <linux/seq_file.h>
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#include <linux/mount.h>
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#include <asm/uaccess.h>
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#include "ext2.h"
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#include "xattr.h"
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#include "acl.h"
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#include "xip.h"
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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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static int ext2_remount (struct super_block * sb, int * flags, char * data);
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static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
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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_sb_info *sbi = EXT2_SB(sb);
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struct ext2_super_block *es = sbi->s_es;
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if (!(sb->s_flags & MS_RDONLY)) {
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sbi->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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printk(KERN_CRIT "EXT2-fs error (device %s): %s: ",sb->s_id, function);
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vprintk(fmt, args);
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printk("\n");
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va_end(args);
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if (test_opt(sb, ERRORS_PANIC))
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panic("EXT2-fs panic from previous error\n");
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if (test_opt(sb, ERRORS_RO)) {
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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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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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printk(KERN_WARNING "EXT2-fs warning (device %s): %s: ",
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sb->s_id, function);
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vprintk(fmt, args);
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printk("\n");
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va_end(args);
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}
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void ext2_update_dynamic_rev(struct super_block *sb)
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{
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struct ext2_super_block *es = EXT2_SB(sb)->s_es;
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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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ext2_warning(sb, __FUNCTION__,
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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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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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/*
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* The rest of the superblock fields should be zero, and if not it
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* means they are likely already in use, so leave them alone. We
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* can leave it up to e2fsck to clean up any inconsistencies there.
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*/
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}
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static 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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struct ext2_sb_info *sbi = EXT2_SB(sb);
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ext2_xattr_put_super(sb);
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if (!(sb->s_flags & MS_RDONLY)) {
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struct ext2_super_block *es = sbi->s_es;
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es->s_state = cpu_to_le16(sbi->s_mount_state);
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ext2_sync_super(sb, es);
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}
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db_count = sbi->s_gdb_count;
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for (i = 0; i < db_count; i++)
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if (sbi->s_group_desc[i])
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brelse (sbi->s_group_desc[i]);
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kfree(sbi->s_group_desc);
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kfree(sbi->s_debts);
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percpu_counter_destroy(&sbi->s_freeblocks_counter);
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percpu_counter_destroy(&sbi->s_freeinodes_counter);
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percpu_counter_destroy(&sbi->s_dirs_counter);
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brelse (sbi->s_sbh);
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sb->s_fs_info = NULL;
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kfree(sbi);
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return;
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}
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static kmem_cache_t * ext2_inode_cachep;
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static struct inode *ext2_alloc_inode(struct super_block *sb)
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{
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struct ext2_inode_info *ei;
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ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, SLAB_KERNEL);
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if (!ei)
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return NULL;
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#ifdef CONFIG_EXT2_FS_POSIX_ACL
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ei->i_acl = EXT2_ACL_NOT_CACHED;
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ei->i_default_acl = EXT2_ACL_NOT_CACHED;
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#endif
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ei->vfs_inode.i_version = 1;
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return &ei->vfs_inode;
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}
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static void ext2_destroy_inode(struct inode *inode)
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{
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kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
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}
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static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
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{
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struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
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if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
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SLAB_CTOR_CONSTRUCTOR) {
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rwlock_init(&ei->i_meta_lock);
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#ifdef CONFIG_EXT2_FS_XATTR
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init_rwsem(&ei->xattr_sem);
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#endif
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inode_init_once(&ei->vfs_inode);
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}
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}
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static int init_inodecache(void)
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{
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ext2_inode_cachep = kmem_cache_create("ext2_inode_cache",
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sizeof(struct ext2_inode_info),
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0, (SLAB_RECLAIM_ACCOUNT|
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SLAB_MEM_SPREAD),
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init_once, NULL);
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if (ext2_inode_cachep == NULL)
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return -ENOMEM;
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return 0;
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}
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static void destroy_inodecache(void)
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{
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if (kmem_cache_destroy(ext2_inode_cachep))
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printk(KERN_INFO "ext2_inode_cache: not all structures were freed\n");
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}
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static void ext2_clear_inode(struct inode *inode)
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{
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#ifdef CONFIG_EXT2_FS_POSIX_ACL
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struct ext2_inode_info *ei = EXT2_I(inode);
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if (ei->i_acl && ei->i_acl != EXT2_ACL_NOT_CACHED) {
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posix_acl_release(ei->i_acl);
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ei->i_acl = EXT2_ACL_NOT_CACHED;
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}
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if (ei->i_default_acl && ei->i_default_acl != EXT2_ACL_NOT_CACHED) {
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posix_acl_release(ei->i_default_acl);
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ei->i_default_acl = EXT2_ACL_NOT_CACHED;
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}
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#endif
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}
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static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs)
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{
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struct ext2_sb_info *sbi = EXT2_SB(vfs->mnt_sb);
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if (sbi->s_mount_opt & EXT2_MOUNT_GRPID)
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seq_puts(seq, ",grpid");
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#if defined(CONFIG_QUOTA)
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if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA)
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seq_puts(seq, ",usrquota");
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if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA)
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seq_puts(seq, ",grpquota");
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#endif
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#if defined(CONFIG_EXT2_FS_XIP)
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if (sbi->s_mount_opt & EXT2_MOUNT_XIP)
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seq_puts(seq, ",xip");
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#endif
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return 0;
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}
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#ifdef CONFIG_QUOTA
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static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off);
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static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off);
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#endif
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static struct super_operations ext2_sops = {
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.alloc_inode = ext2_alloc_inode,
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.destroy_inode = ext2_destroy_inode,
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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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.delete_inode = ext2_delete_inode,
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.put_super = ext2_put_super,
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.write_super = ext2_write_super,
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.statfs = ext2_statfs,
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.remount_fs = ext2_remount,
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.clear_inode = ext2_clear_inode,
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.show_options = ext2_show_options,
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#ifdef CONFIG_QUOTA
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.quota_read = ext2_quota_read,
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.quota_write = ext2_quota_write,
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#endif
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};
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/* Yes, most of these are left as NULL!!
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* A NULL value implies the default, which works with ext2-like file
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* systems, but can be improved upon.
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* Currently only get_parent is required.
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*/
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static struct export_operations ext2_export_ops = {
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.get_parent = ext2_get_parent,
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};
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static unsigned long get_sb_block(void **data)
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{
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unsigned long sb_block;
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char *options = (char *) *data;
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if (!options || strncmp(options, "sb=", 3) != 0)
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return 1; /* Default location */
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options += 3;
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sb_block = simple_strtoul(options, &options, 0);
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if (*options && *options != ',') {
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printk("EXT2-fs: Invalid sb specification: %s\n",
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(char *) *data);
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return 1;
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}
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if (*options == ',')
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options++;
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*data = (void *) options;
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return sb_block;
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}
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enum {
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Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
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Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
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Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
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Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
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Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota,
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Opt_usrquota, Opt_grpquota
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};
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static match_table_t tokens = {
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{Opt_bsd_df, "bsddf"},
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{Opt_minix_df, "minixdf"},
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{Opt_grpid, "grpid"},
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{Opt_grpid, "bsdgroups"},
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{Opt_nogrpid, "nogrpid"},
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{Opt_nogrpid, "sysvgroups"},
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{Opt_resgid, "resgid=%u"},
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{Opt_resuid, "resuid=%u"},
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{Opt_sb, "sb=%u"},
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{Opt_err_cont, "errors=continue"},
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{Opt_err_panic, "errors=panic"},
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{Opt_err_ro, "errors=remount-ro"},
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{Opt_nouid32, "nouid32"},
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{Opt_nocheck, "check=none"},
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{Opt_nocheck, "nocheck"},
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{Opt_debug, "debug"},
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{Opt_oldalloc, "oldalloc"},
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{Opt_orlov, "orlov"},
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{Opt_nobh, "nobh"},
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{Opt_user_xattr, "user_xattr"},
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{Opt_nouser_xattr, "nouser_xattr"},
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{Opt_acl, "acl"},
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{Opt_noacl, "noacl"},
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{Opt_xip, "xip"},
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{Opt_grpquota, "grpquota"},
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{Opt_ignore, "noquota"},
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{Opt_quota, "quota"},
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{Opt_usrquota, "usrquota"},
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{Opt_err, NULL}
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};
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static int parse_options (char * options,
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struct ext2_sb_info *sbi)
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{
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char * p;
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substring_t args[MAX_OPT_ARGS];
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unsigned long kind = EXT2_MOUNT_ERRORS_CONT;
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int option;
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if (!options)
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return 1;
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while ((p = strsep (&options, ",")) != NULL) {
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int token;
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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switch (token) {
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case Opt_bsd_df:
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clear_opt (sbi->s_mount_opt, MINIX_DF);
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break;
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case Opt_minix_df:
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set_opt (sbi->s_mount_opt, MINIX_DF);
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break;
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case Opt_grpid:
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set_opt (sbi->s_mount_opt, GRPID);
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break;
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case Opt_nogrpid:
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clear_opt (sbi->s_mount_opt, GRPID);
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break;
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case Opt_resuid:
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if (match_int(&args[0], &option))
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return 0;
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sbi->s_resuid = option;
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break;
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case Opt_resgid:
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if (match_int(&args[0], &option))
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return 0;
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sbi->s_resgid = option;
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break;
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case Opt_sb:
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/* handled by get_sb_block() instead of here */
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/* *sb_block = match_int(&args[0]); */
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break;
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case Opt_err_panic:
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kind = EXT2_MOUNT_ERRORS_PANIC;
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break;
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case Opt_err_ro:
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kind = EXT2_MOUNT_ERRORS_RO;
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break;
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case Opt_err_cont:
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kind = EXT2_MOUNT_ERRORS_CONT;
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break;
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case Opt_nouid32:
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set_opt (sbi->s_mount_opt, NO_UID32);
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break;
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case Opt_nocheck:
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clear_opt (sbi->s_mount_opt, CHECK);
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break;
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case Opt_debug:
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set_opt (sbi->s_mount_opt, DEBUG);
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break;
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case Opt_oldalloc:
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set_opt (sbi->s_mount_opt, OLDALLOC);
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break;
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case Opt_orlov:
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clear_opt (sbi->s_mount_opt, OLDALLOC);
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break;
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case Opt_nobh:
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set_opt (sbi->s_mount_opt, NOBH);
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break;
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#ifdef CONFIG_EXT2_FS_XATTR
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case Opt_user_xattr:
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set_opt (sbi->s_mount_opt, XATTR_USER);
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break;
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case Opt_nouser_xattr:
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clear_opt (sbi->s_mount_opt, XATTR_USER);
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break;
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#else
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case Opt_user_xattr:
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case Opt_nouser_xattr:
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printk("EXT2 (no)user_xattr options not supported\n");
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break;
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#endif
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#ifdef CONFIG_EXT2_FS_POSIX_ACL
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case Opt_acl:
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set_opt(sbi->s_mount_opt, POSIX_ACL);
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break;
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case Opt_noacl:
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clear_opt(sbi->s_mount_opt, POSIX_ACL);
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break;
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#else
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case Opt_acl:
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case Opt_noacl:
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printk("EXT2 (no)acl options not supported\n");
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break;
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#endif
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case Opt_xip:
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#ifdef CONFIG_EXT2_FS_XIP
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set_opt (sbi->s_mount_opt, XIP);
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#else
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printk("EXT2 xip option not supported\n");
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#endif
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break;
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|
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#if defined(CONFIG_QUOTA)
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case Opt_quota:
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case Opt_usrquota:
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set_opt(sbi->s_mount_opt, USRQUOTA);
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break;
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|
|
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case Opt_grpquota:
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set_opt(sbi->s_mount_opt, GRPQUOTA);
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break;
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#else
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case Opt_quota:
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case Opt_usrquota:
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case Opt_grpquota:
|
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printk(KERN_ERR
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"EXT2-fs: quota operations not supported.\n");
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|
|
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break;
|
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#endif
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|
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case Opt_ignore:
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break;
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default:
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return 0;
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}
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}
|
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sbi->s_mount_opt |= kind;
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return 1;
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}
|
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|
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static int ext2_setup_super (struct super_block * sb,
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struct ext2_super_block * es,
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int read_only)
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{
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int res = 0;
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struct ext2_sb_info *sbi = EXT2_SB(sb);
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|
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if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
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printk ("EXT2-fs warning: revision level too high, "
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"forcing read-only mode\n");
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res = MS_RDONLY;
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}
|
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if (read_only)
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return res;
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if (!(sbi->s_mount_state & EXT2_VALID_FS))
|
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printk ("EXT2-fs warning: mounting unchecked fs, "
|
|
"running e2fsck is recommended\n");
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else if ((sbi->s_mount_state & EXT2_ERROR_FS))
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printk ("EXT2-fs warning: mounting fs with errors, "
|
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"running e2fsck is recommended\n");
|
|
else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
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le16_to_cpu(es->s_mnt_count) >=
|
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(unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
|
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printk ("EXT2-fs warning: maximal mount count reached, "
|
|
"running e2fsck is recommended\n");
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else if (le32_to_cpu(es->s_checkinterval) &&
|
|
(le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= get_seconds()))
|
|
printk ("EXT2-fs warning: checktime reached, "
|
|
"running e2fsck is recommended\n");
|
|
if (!le16_to_cpu(es->s_max_mnt_count))
|
|
es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT);
|
|
es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
|
|
ext2_write_super(sb);
|
|
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,
|
|
sbi->s_frag_size,
|
|
sbi->s_groups_count,
|
|
EXT2_BLOCKS_PER_GROUP(sb),
|
|
EXT2_INODES_PER_GROUP(sb),
|
|
sbi->s_mount_opt);
|
|
return res;
|
|
}
|
|
|
|
static int ext2_check_descriptors (struct super_block * sb)
|
|
{
|
|
int i;
|
|
int desc_block = 0;
|
|
struct ext2_sb_info *sbi = EXT2_SB(sb);
|
|
unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
|
|
struct ext2_group_desc * gdp = NULL;
|
|
|
|
ext2_debug ("Checking group descriptors");
|
|
|
|
for (i = 0; i < sbi->s_groups_count; i++)
|
|
{
|
|
if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
|
|
gdp = (struct ext2_group_desc *) sbi->s_group_desc[desc_block++]->b_data;
|
|
if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
|
|
le32_to_cpu(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) le32_to_cpu(gdp->bg_block_bitmap));
|
|
return 0;
|
|
}
|
|
if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
|
|
le32_to_cpu(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) le32_to_cpu(gdp->bg_inode_bitmap));
|
|
return 0;
|
|
}
|
|
if (le32_to_cpu(gdp->bg_inode_table) < block ||
|
|
le32_to_cpu(gdp->bg_inode_table) + sbi->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) le32_to_cpu(gdp->bg_inode_table));
|
|
return 0;
|
|
}
|
|
block += EXT2_BLOCKS_PER_GROUP(sb);
|
|
gdp++;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
#define log2(n) ffz(~(n))
|
|
|
|
/*
|
|
* Maximal file size. There is a direct, and {,double-,triple-}indirect
|
|
* block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
|
|
* We need to be 1 filesystem block less than the 2^32 sector limit.
|
|
*/
|
|
static loff_t ext2_max_size(int bits)
|
|
{
|
|
loff_t res = EXT2_NDIR_BLOCKS;
|
|
/* This constant is calculated to be the largest file size for a
|
|
* dense, 4k-blocksize file such that the total number of
|
|
* sectors in the file, including data and all indirect blocks,
|
|
* does not exceed 2^32. */
|
|
const loff_t upper_limit = 0x1ff7fffd000LL;
|
|
|
|
res += 1LL << (bits-2);
|
|
res += 1LL << (2*(bits-2));
|
|
res += 1LL << (3*(bits-2));
|
|
res <<= bits;
|
|
if (res > upper_limit)
|
|
res = upper_limit;
|
|
return res;
|
|
}
|
|
|
|
static unsigned long descriptor_loc(struct super_block *sb,
|
|
unsigned long logic_sb_block,
|
|
int nr)
|
|
{
|
|
struct ext2_sb_info *sbi = EXT2_SB(sb);
|
|
unsigned long bg, first_data_block, first_meta_bg;
|
|
int has_super = 0;
|
|
|
|
first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
|
|
first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
|
|
|
|
if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) ||
|
|
nr < first_meta_bg)
|
|
return (logic_sb_block + nr + 1);
|
|
bg = sbi->s_desc_per_block * nr;
|
|
if (ext2_bg_has_super(sb, bg))
|
|
has_super = 1;
|
|
return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
|
|
}
|
|
|
|
static int ext2_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct buffer_head * bh;
|
|
struct ext2_sb_info * sbi;
|
|
struct ext2_super_block * es;
|
|
struct inode *root;
|
|
unsigned long block;
|
|
unsigned long sb_block = get_sb_block(&data);
|
|
unsigned long logic_sb_block;
|
|
unsigned long offset = 0;
|
|
unsigned long def_mount_opts;
|
|
int blocksize = BLOCK_SIZE;
|
|
int db_count;
|
|
int i, j;
|
|
__le32 features;
|
|
|
|
sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
|
|
if (!sbi)
|
|
return -ENOMEM;
|
|
sb->s_fs_info = sbi;
|
|
memset(sbi, 0, sizeof(*sbi));
|
|
|
|
/*
|
|
* See what the current blocksize for the device is, and
|
|
* use that as the blocksize. Otherwise (or if the blocksize
|
|
* is smaller than the default) use the default.
|
|
* This is important for devices that have a hardware
|
|
* sectorsize that is larger than the default.
|
|
*/
|
|
blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
|
|
if (!blocksize) {
|
|
printk ("EXT2-fs: unable to set blocksize\n");
|
|
goto failed_sbi;
|
|
}
|
|
|
|
/*
|
|
* If the superblock doesn't start on a hardware sector boundary,
|
|
* calculate the offset.
|
|
*/
|
|
if (blocksize != BLOCK_SIZE) {
|
|
logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
|
|
offset = (sb_block*BLOCK_SIZE) % blocksize;
|
|
} else {
|
|
logic_sb_block = sb_block;
|
|
}
|
|
|
|
if (!(bh = sb_bread(sb, logic_sb_block))) {
|
|
printk ("EXT2-fs: unable to read superblock\n");
|
|
goto failed_sbi;
|
|
}
|
|
/*
|
|
* Note: s_es must be initialized as soon as possible because
|
|
* some ext2 macro-instructions depend on its value
|
|
*/
|
|
es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
|
|
sbi->s_es = es;
|
|
sb->s_magic = le16_to_cpu(es->s_magic);
|
|
|
|
if (sb->s_magic != EXT2_SUPER_MAGIC)
|
|
goto cantfind_ext2;
|
|
|
|
/* Set defaults before we parse the mount options */
|
|
def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
|
|
if (def_mount_opts & EXT2_DEFM_DEBUG)
|
|
set_opt(sbi->s_mount_opt, DEBUG);
|
|
if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
|
|
set_opt(sbi->s_mount_opt, GRPID);
|
|
if (def_mount_opts & EXT2_DEFM_UID16)
|
|
set_opt(sbi->s_mount_opt, NO_UID32);
|
|
if (def_mount_opts & EXT2_DEFM_XATTR_USER)
|
|
set_opt(sbi->s_mount_opt, XATTR_USER);
|
|
if (def_mount_opts & EXT2_DEFM_ACL)
|
|
set_opt(sbi->s_mount_opt, POSIX_ACL);
|
|
|
|
if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
|
|
set_opt(sbi->s_mount_opt, ERRORS_PANIC);
|
|
else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_RO)
|
|
set_opt(sbi->s_mount_opt, ERRORS_RO);
|
|
|
|
sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
|
|
sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
|
|
|
|
if (!parse_options ((char *) data, sbi))
|
|
goto failed_mount;
|
|
|
|
sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
|
|
((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
|
|
MS_POSIXACL : 0);
|
|
|
|
ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
|
|
EXT2_MOUNT_XIP if not */
|
|
|
|
if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
|
|
(EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
|
|
EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
|
|
EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
|
|
printk("EXT2-fs warning: feature flags set on rev 0 fs, "
|
|
"running e2fsck is recommended\n");
|
|
/*
|
|
* Check feature flags regardless of the revision level, since we
|
|
* previously didn't change the revision level when setting the flags,
|
|
* so there is a chance incompat flags are set on a rev 0 filesystem.
|
|
*/
|
|
features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
|
|
if (features) {
|
|
printk("EXT2-fs: %s: couldn't mount because of "
|
|
"unsupported optional features (%x).\n",
|
|
sb->s_id, le32_to_cpu(features));
|
|
goto failed_mount;
|
|
}
|
|
if (!(sb->s_flags & MS_RDONLY) &&
|
|
(features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
|
|
printk("EXT2-fs: %s: couldn't mount RDWR because of "
|
|
"unsupported optional features (%x).\n",
|
|
sb->s_id, le32_to_cpu(features));
|
|
goto failed_mount;
|
|
}
|
|
|
|
blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
|
|
|
|
if ((ext2_use_xip(sb)) && ((blocksize != PAGE_SIZE) ||
|
|
(sb->s_blocksize != blocksize))) {
|
|
if (!silent)
|
|
printk("XIP: Unsupported blocksize\n");
|
|
goto failed_mount;
|
|
}
|
|
|
|
/* If the blocksize doesn't match, re-read the thing.. */
|
|
if (sb->s_blocksize != blocksize) {
|
|
brelse(bh);
|
|
|
|
if (!sb_set_blocksize(sb, blocksize)) {
|
|
printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n");
|
|
goto failed_sbi;
|
|
}
|
|
|
|
logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
|
|
offset = (sb_block*BLOCK_SIZE) % blocksize;
|
|
bh = sb_bread(sb, logic_sb_block);
|
|
if(!bh) {
|
|
printk("EXT2-fs: Couldn't read superblock on "
|
|
"2nd try.\n");
|
|
goto failed_sbi;
|
|
}
|
|
es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
|
|
sbi->s_es = es;
|
|
if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
|
|
printk ("EXT2-fs: Magic mismatch, very weird !\n");
|
|
goto failed_mount;
|
|
}
|
|
}
|
|
|
|
sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
|
|
|
|
if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
|
|
sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
|
|
sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
|
|
} else {
|
|
sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
|
|
sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
|
|
if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
|
|
(sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
|
|
(sbi->s_inode_size > blocksize)) {
|
|
printk ("EXT2-fs: unsupported inode size: %d\n",
|
|
sbi->s_inode_size);
|
|
goto failed_mount;
|
|
}
|
|
}
|
|
|
|
sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
|
|
le32_to_cpu(es->s_log_frag_size);
|
|
if (sbi->s_frag_size == 0)
|
|
goto cantfind_ext2;
|
|
sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;
|
|
|
|
sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
|
|
sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
|
|
sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
|
|
|
|
if (EXT2_INODE_SIZE(sb) == 0)
|
|
goto cantfind_ext2;
|
|
sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
|
|
if (sbi->s_inodes_per_block == 0)
|
|
goto cantfind_ext2;
|
|
sbi->s_itb_per_group = sbi->s_inodes_per_group /
|
|
sbi->s_inodes_per_block;
|
|
sbi->s_desc_per_block = sb->s_blocksize /
|
|
sizeof (struct ext2_group_desc);
|
|
sbi->s_sbh = bh;
|
|
sbi->s_mount_state = le16_to_cpu(es->s_state);
|
|
sbi->s_addr_per_block_bits =
|
|
log2 (EXT2_ADDR_PER_BLOCK(sb));
|
|
sbi->s_desc_per_block_bits =
|
|
log2 (EXT2_DESC_PER_BLOCK(sb));
|
|
|
|
if (sb->s_magic != EXT2_SUPER_MAGIC)
|
|
goto cantfind_ext2;
|
|
|
|
if (sb->s_blocksize != bh->b_size) {
|
|
if (!silent)
|
|
printk ("VFS: Unsupported blocksize on dev "
|
|
"%s.\n", sb->s_id);
|
|
goto failed_mount;
|
|
}
|
|
|
|
if (sb->s_blocksize != sbi->s_frag_size) {
|
|
printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
|
|
sbi->s_frag_size, sb->s_blocksize);
|
|
goto failed_mount;
|
|
}
|
|
|
|
if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
|
|
printk ("EXT2-fs: #blocks per group too big: %lu\n",
|
|
sbi->s_blocks_per_group);
|
|
goto failed_mount;
|
|
}
|
|
if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
|
|
printk ("EXT2-fs: #fragments per group too big: %lu\n",
|
|
sbi->s_frags_per_group);
|
|
goto failed_mount;
|
|
}
|
|
if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
|
|
printk ("EXT2-fs: #inodes per group too big: %lu\n",
|
|
sbi->s_inodes_per_group);
|
|
goto failed_mount;
|
|
}
|
|
|
|
if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
|
|
goto cantfind_ext2;
|
|
sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
|
|
le32_to_cpu(es->s_first_data_block) +
|
|
EXT2_BLOCKS_PER_GROUP(sb) - 1) /
|
|
EXT2_BLOCKS_PER_GROUP(sb);
|
|
db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
|
|
EXT2_DESC_PER_BLOCK(sb);
|
|
sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
|
|
if (sbi->s_group_desc == NULL) {
|
|
printk ("EXT2-fs: not enough memory\n");
|
|
goto failed_mount;
|
|
}
|
|
bgl_lock_init(&sbi->s_blockgroup_lock);
|
|
sbi->s_debts = kmalloc(sbi->s_groups_count * sizeof(*sbi->s_debts),
|
|
GFP_KERNEL);
|
|
if (!sbi->s_debts) {
|
|
printk ("EXT2-fs: not enough memory\n");
|
|
goto failed_mount_group_desc;
|
|
}
|
|
memset(sbi->s_debts, 0, sbi->s_groups_count * sizeof(*sbi->s_debts));
|
|
for (i = 0; i < db_count; i++) {
|
|
block = descriptor_loc(sb, logic_sb_block, i);
|
|
sbi->s_group_desc[i] = sb_bread(sb, block);
|
|
if (!sbi->s_group_desc[i]) {
|
|
for (j = 0; j < i; j++)
|
|
brelse (sbi->s_group_desc[j]);
|
|
printk ("EXT2-fs: unable to read group descriptors\n");
|
|
goto failed_mount_group_desc;
|
|
}
|
|
}
|
|
if (!ext2_check_descriptors (sb)) {
|
|
printk ("EXT2-fs: group descriptors corrupted!\n");
|
|
goto failed_mount2;
|
|
}
|
|
sbi->s_gdb_count = db_count;
|
|
get_random_bytes(&sbi->s_next_generation, sizeof(u32));
|
|
spin_lock_init(&sbi->s_next_gen_lock);
|
|
|
|
percpu_counter_init(&sbi->s_freeblocks_counter,
|
|
ext2_count_free_blocks(sb));
|
|
percpu_counter_init(&sbi->s_freeinodes_counter,
|
|
ext2_count_free_inodes(sb));
|
|
percpu_counter_init(&sbi->s_dirs_counter,
|
|
ext2_count_dirs(sb));
|
|
/*
|
|
* set up enough so that it can read an inode
|
|
*/
|
|
sb->s_op = &ext2_sops;
|
|
sb->s_export_op = &ext2_export_ops;
|
|
sb->s_xattr = ext2_xattr_handlers;
|
|
root = iget(sb, EXT2_ROOT_INO);
|
|
sb->s_root = d_alloc_root(root);
|
|
if (!sb->s_root) {
|
|
iput(root);
|
|
printk(KERN_ERR "EXT2-fs: get root inode failed\n");
|
|
goto failed_mount3;
|
|
}
|
|
if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
|
|
dput(sb->s_root);
|
|
sb->s_root = NULL;
|
|
printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n");
|
|
goto failed_mount3;
|
|
}
|
|
if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
|
|
ext2_warning(sb, __FUNCTION__,
|
|
"mounting ext3 filesystem as ext2");
|
|
ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY);
|
|
return 0;
|
|
|
|
cantfind_ext2:
|
|
if (!silent)
|
|
printk("VFS: Can't find an ext2 filesystem on dev %s.\n",
|
|
sb->s_id);
|
|
goto failed_mount;
|
|
failed_mount3:
|
|
percpu_counter_destroy(&sbi->s_freeblocks_counter);
|
|
percpu_counter_destroy(&sbi->s_freeinodes_counter);
|
|
percpu_counter_destroy(&sbi->s_dirs_counter);
|
|
failed_mount2:
|
|
for (i = 0; i < db_count; i++)
|
|
brelse(sbi->s_group_desc[i]);
|
|
failed_mount_group_desc:
|
|
kfree(sbi->s_group_desc);
|
|
kfree(sbi->s_debts);
|
|
failed_mount:
|
|
brelse(bh);
|
|
failed_sbi:
|
|
sb->s_fs_info = NULL;
|
|
kfree(sbi);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void ext2_commit_super (struct super_block * sb,
|
|
struct ext2_super_block * es)
|
|
{
|
|
es->s_wtime = cpu_to_le32(get_seconds());
|
|
mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
|
|
sb->s_dirt = 0;
|
|
}
|
|
|
|
static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es)
|
|
{
|
|
es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
|
|
es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
|
|
es->s_wtime = cpu_to_le32(get_seconds());
|
|
mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
|
|
sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
|
|
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;
|
|
lock_kernel();
|
|
if (!(sb->s_flags & MS_RDONLY)) {
|
|
es = EXT2_SB(sb)->s_es;
|
|
|
|
if (le16_to_cpu(es->s_state) & EXT2_VALID_FS) {
|
|
ext2_debug ("setting valid to 0\n");
|
|
es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) &
|
|
~EXT2_VALID_FS);
|
|
es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
|
|
es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
|
|
es->s_mtime = cpu_to_le32(get_seconds());
|
|
ext2_sync_super(sb, es);
|
|
} else
|
|
ext2_commit_super (sb, es);
|
|
}
|
|
sb->s_dirt = 0;
|
|
unlock_kernel();
|
|
}
|
|
|
|
static int ext2_remount (struct super_block * sb, int * flags, char * data)
|
|
{
|
|
struct ext2_sb_info * sbi = EXT2_SB(sb);
|
|
struct ext2_super_block * es;
|
|
unsigned long old_mount_opt = sbi->s_mount_opt;
|
|
struct ext2_mount_options old_opts;
|
|
unsigned long old_sb_flags;
|
|
int err;
|
|
|
|
/* Store the old options */
|
|
old_sb_flags = sb->s_flags;
|
|
old_opts.s_mount_opt = sbi->s_mount_opt;
|
|
old_opts.s_resuid = sbi->s_resuid;
|
|
old_opts.s_resgid = sbi->s_resgid;
|
|
|
|
/*
|
|
* Allow the "check" option to be passed as a remount option.
|
|
*/
|
|
if (!parse_options (data, sbi)) {
|
|
err = -EINVAL;
|
|
goto restore_opts;
|
|
}
|
|
|
|
sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
|
|
((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
|
|
|
|
es = sbi->s_es;
|
|
if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) !=
|
|
(old_mount_opt & EXT2_MOUNT_XIP)) &&
|
|
invalidate_inodes(sb))
|
|
ext2_warning(sb, __FUNCTION__, "busy inodes while remounting "\
|
|
"xip remain in cache (no functional problem)");
|
|
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
|
|
return 0;
|
|
if (*flags & MS_RDONLY) {
|
|
if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
|
|
!(sbi->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 = cpu_to_le16(sbi->s_mount_state);
|
|
es->s_mtime = cpu_to_le32(get_seconds());
|
|
} else {
|
|
__le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
|
|
~EXT2_FEATURE_RO_COMPAT_SUPP);
|
|
if (ret) {
|
|
printk("EXT2-fs: %s: couldn't remount RDWR because of "
|
|
"unsupported optional features (%x).\n",
|
|
sb->s_id, le32_to_cpu(ret));
|
|
err = -EROFS;
|
|
goto restore_opts;
|
|
}
|
|
/*
|
|
* 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.)
|
|
*/
|
|
sbi->s_mount_state = le16_to_cpu(es->s_state);
|
|
if (!ext2_setup_super (sb, es, 0))
|
|
sb->s_flags &= ~MS_RDONLY;
|
|
}
|
|
ext2_sync_super(sb, es);
|
|
return 0;
|
|
restore_opts:
|
|
sbi->s_mount_opt = old_opts.s_mount_opt;
|
|
sbi->s_resuid = old_opts.s_resuid;
|
|
sbi->s_resgid = old_opts.s_resgid;
|
|
sb->s_flags = old_sb_flags;
|
|
return err;
|
|
}
|
|
|
|
static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
struct ext2_sb_info *sbi = EXT2_SB(sb);
|
|
unsigned long overhead;
|
|
int i;
|
|
|
|
lock_super(sb);
|
|
if (test_opt (sb, MINIX_DF))
|
|
overhead = 0;
|
|
else {
|
|
/*
|
|
* Compute the overhead (FS structures)
|
|
*/
|
|
|
|
/*
|
|
* All of the blocks before first_data_block are
|
|
* overhead
|
|
*/
|
|
overhead = le32_to_cpu(sbi->s_es->s_first_data_block);
|
|
|
|
/*
|
|
* Add the overhead attributed to the superblock and
|
|
* block group descriptors. If the sparse superblocks
|
|
* feature is turned on, then not all groups have this.
|
|
*/
|
|
for (i = 0; i < sbi->s_groups_count; i++)
|
|
overhead += ext2_bg_has_super(sb, i) +
|
|
ext2_bg_num_gdb(sb, i);
|
|
|
|
/*
|
|
* Every block group has an inode bitmap, a block
|
|
* bitmap, and an inode table.
|
|
*/
|
|
overhead += (sbi->s_groups_count *
|
|
(2 + sbi->s_itb_per_group));
|
|
}
|
|
|
|
buf->f_type = EXT2_SUPER_MAGIC;
|
|
buf->f_bsize = sb->s_blocksize;
|
|
buf->f_blocks = le32_to_cpu(sbi->s_es->s_blocks_count) - overhead;
|
|
buf->f_bfree = ext2_count_free_blocks(sb);
|
|
buf->f_bavail = buf->f_bfree - le32_to_cpu(sbi->s_es->s_r_blocks_count);
|
|
if (buf->f_bfree < le32_to_cpu(sbi->s_es->s_r_blocks_count))
|
|
buf->f_bavail = 0;
|
|
buf->f_files = le32_to_cpu(sbi->s_es->s_inodes_count);
|
|
buf->f_ffree = ext2_count_free_inodes (sb);
|
|
buf->f_namelen = EXT2_NAME_LEN;
|
|
unlock_super(sb);
|
|
return 0;
|
|
}
|
|
|
|
static int ext2_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
|
|
{
|
|
return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super, mnt);
|
|
}
|
|
|
|
#ifdef CONFIG_QUOTA
|
|
|
|
/* Read data from quotafile - avoid pagecache and such because we cannot afford
|
|
* acquiring the locks... As quota files are never truncated and quota code
|
|
* itself serializes the operations (and noone else should touch the files)
|
|
* we don't have to be afraid of races */
|
|
static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
|
|
size_t len, loff_t off)
|
|
{
|
|
struct inode *inode = sb_dqopt(sb)->files[type];
|
|
sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
|
|
int err = 0;
|
|
int offset = off & (sb->s_blocksize - 1);
|
|
int tocopy;
|
|
size_t toread;
|
|
struct buffer_head tmp_bh;
|
|
struct buffer_head *bh;
|
|
loff_t i_size = i_size_read(inode);
|
|
|
|
if (off > i_size)
|
|
return 0;
|
|
if (off+len > i_size)
|
|
len = i_size-off;
|
|
toread = len;
|
|
while (toread > 0) {
|
|
tocopy = sb->s_blocksize - offset < toread ?
|
|
sb->s_blocksize - offset : toread;
|
|
|
|
tmp_bh.b_state = 0;
|
|
err = ext2_get_block(inode, blk, &tmp_bh, 0);
|
|
if (err)
|
|
return err;
|
|
if (!buffer_mapped(&tmp_bh)) /* A hole? */
|
|
memset(data, 0, tocopy);
|
|
else {
|
|
bh = sb_bread(sb, tmp_bh.b_blocknr);
|
|
if (!bh)
|
|
return -EIO;
|
|
memcpy(data, bh->b_data+offset, tocopy);
|
|
brelse(bh);
|
|
}
|
|
offset = 0;
|
|
toread -= tocopy;
|
|
data += tocopy;
|
|
blk++;
|
|
}
|
|
return len;
|
|
}
|
|
|
|
/* Write to quotafile */
|
|
static ssize_t ext2_quota_write(struct super_block *sb, int type,
|
|
const char *data, size_t len, loff_t off)
|
|
{
|
|
struct inode *inode = sb_dqopt(sb)->files[type];
|
|
sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb);
|
|
int err = 0;
|
|
int offset = off & (sb->s_blocksize - 1);
|
|
int tocopy;
|
|
size_t towrite = len;
|
|
struct buffer_head tmp_bh;
|
|
struct buffer_head *bh;
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
while (towrite > 0) {
|
|
tocopy = sb->s_blocksize - offset < towrite ?
|
|
sb->s_blocksize - offset : towrite;
|
|
|
|
tmp_bh.b_state = 0;
|
|
err = ext2_get_block(inode, blk, &tmp_bh, 1);
|
|
if (err)
|
|
goto out;
|
|
if (offset || tocopy != EXT2_BLOCK_SIZE(sb))
|
|
bh = sb_bread(sb, tmp_bh.b_blocknr);
|
|
else
|
|
bh = sb_getblk(sb, tmp_bh.b_blocknr);
|
|
if (!bh) {
|
|
err = -EIO;
|
|
goto out;
|
|
}
|
|
lock_buffer(bh);
|
|
memcpy(bh->b_data+offset, data, tocopy);
|
|
flush_dcache_page(bh->b_page);
|
|
set_buffer_uptodate(bh);
|
|
mark_buffer_dirty(bh);
|
|
unlock_buffer(bh);
|
|
brelse(bh);
|
|
offset = 0;
|
|
towrite -= tocopy;
|
|
data += tocopy;
|
|
blk++;
|
|
}
|
|
out:
|
|
if (len == towrite)
|
|
return err;
|
|
if (inode->i_size < off+len-towrite)
|
|
i_size_write(inode, off+len-towrite);
|
|
inode->i_version++;
|
|
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
|
mark_inode_dirty(inode);
|
|
mutex_unlock(&inode->i_mutex);
|
|
return len - towrite;
|
|
}
|
|
|
|
#endif
|
|
|
|
static struct file_system_type ext2_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ext2",
|
|
.get_sb = ext2_get_sb,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
|
|
static int __init init_ext2_fs(void)
|
|
{
|
|
int err = init_ext2_xattr();
|
|
if (err)
|
|
return err;
|
|
err = init_inodecache();
|
|
if (err)
|
|
goto out1;
|
|
err = register_filesystem(&ext2_fs_type);
|
|
if (err)
|
|
goto out;
|
|
return 0;
|
|
out:
|
|
destroy_inodecache();
|
|
out1:
|
|
exit_ext2_xattr();
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_ext2_fs(void)
|
|
{
|
|
unregister_filesystem(&ext2_fs_type);
|
|
destroy_inodecache();
|
|
exit_ext2_xattr();
|
|
}
|
|
|
|
module_init(init_ext2_fs)
|
|
module_exit(exit_ext2_fs)
|