2005-04-17 06:20:36 +08:00
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/*
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* linux/fs/ext2/super.c
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/fs/minix/inode.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* 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/module.h>
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#include <linux/string.h>
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2005-09-07 06:16:54 +08:00
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#include <linux/fs.h>
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2005-04-17 06:20:36 +08:00
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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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2007-07-17 19:04:28 +08:00
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#include <linux/exportfs.h>
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2005-04-17 06:20:36 +08:00
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#include <linux/smp_lock.h>
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#include <linux/vfs.h>
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2005-09-07 06:16:54 +08:00
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#include <linux/seq_file.h>
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#include <linux/mount.h>
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2005-04-17 06:20:36 +08:00
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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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2005-06-24 13:05:26 +08:00
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#include "xip.h"
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2005-04-17 06:20:36 +08:00
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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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2006-06-23 17:02:58 +08:00
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static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf);
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2005-04-17 06:20:36 +08:00
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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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2006-12-07 12:33:20 +08:00
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static struct kmem_cache * ext2_inode_cachep;
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2005-04-17 06:20:36 +08:00
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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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2006-12-07 12:33:17 +08:00
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ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL);
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2005-04-17 06:20:36 +08:00
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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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2006-12-07 12:33:20 +08:00
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static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
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2005-04-17 06:20:36 +08:00
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{
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struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
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2007-05-17 13:10:57 +08:00
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rwlock_init(&ei->i_meta_lock);
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2005-04-17 06:20:36 +08:00
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#ifdef CONFIG_EXT2_FS_XATTR
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2007-05-17 13:10:57 +08:00
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init_rwsem(&ei->xattr_sem);
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2005-04-17 06:20:36 +08:00
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#endif
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2007-05-17 13:10:57 +08:00
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inode_init_once(&ei->vfs_inode);
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2005-04-17 06:20:36 +08:00
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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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2006-03-24 19:16:06 +08:00
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0, (SLAB_RECLAIM_ACCOUNT|
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SLAB_MEM_SPREAD),
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2005-04-17 06:20:36 +08:00
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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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2006-09-27 16:49:40 +08:00
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kmem_cache_destroy(ext2_inode_cachep);
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2005-04-17 06:20:36 +08:00
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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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2005-09-07 06:16:54 +08:00
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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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2006-02-03 19:04:25 +08:00
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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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2005-09-07 06:16:54 +08:00
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return 0;
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}
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2005-04-17 06:20:36 +08:00
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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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2007-02-12 16:55:41 +08:00
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static const struct super_operations ext2_sops = {
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2005-04-17 06:20:36 +08:00
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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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[PATCH] ext2 corruption - regression between 2.6.9 and 2.6.10
Whilst trying to stress test a Promise SX8 card, we stumbled across
some nasty filesystem corruption in ext2. Our tests involved
creating an ext2 partition, mounting, running several concurrent
fsx's over it, umounting, and fsck'ing, all scripted[1]. The fsck
would always return with errors.
This regression was traced back to a change between 2.6.9 and
2.6.10, which moves the functionality of ext2_put_inode into
ext2_clear_inode. The attached patch reverses this change, and
eliminated the source of corruption.
Mingming Cao <cmm@us.ibm.com> said:
I think his patch for ext2 is correct. The corruption on ext3 is not the same
issue he saw on ext2. I believe that's the race between discard reservation
and reservation in-use that we already fixed it in 2.6.12- rc1.
For the problem related to ext2, at the time when we design reservation for
ext3, we decide we only need to discard the reservation at the last file
close, so we have ext3_discard_reservation on iput_final- >ext3_clear_inode.
The ext2 handle discard preallocation differently at that time, it discard the
preallocation at each iput(), not in input_final(), so we think it's
unnecessary to thrash it so frequently, and the right thing to do, as we did
for ext3 reservation, discard preallocation on last iput(). So we moved the
ext2_discard_preallocation from ext2_put_inode(0 to ext2_clear_inode.
Since ext2 preallocation is doing pre-allocation on disk, so it is possible
that at the unmount time, someone is still hold the reference of the inode, so
the preallocation for a file is not discard yet, so we still mark those blocks
allocated on disk, while they are not actually in the inode's block map, so
fsck will catch/fix that error later.
This is not a issue for ext3, as ext3 reservation(pre-allocation) is done in
memory.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-04-17 06:25:45 +08:00
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.put_inode = ext2_put_inode,
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2005-04-17 06:20:36 +08:00
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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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2005-09-07 06:16:54 +08:00
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.show_options = ext2_show_options,
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2005-04-17 06:20:36 +08:00
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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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2006-09-17 03:15:37 +08:00
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static struct dentry *ext2_get_dentry(struct super_block *sb, void *vobjp)
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{
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__u32 *objp = vobjp;
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unsigned long ino = objp[0];
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__u32 generation = objp[1];
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struct inode *inode;
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struct dentry *result;
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if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO)
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return ERR_PTR(-ESTALE);
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if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count))
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return ERR_PTR(-ESTALE);
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/* iget isn't really right if the inode is currently unallocated!!
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* ext2_read_inode currently does appropriate checks, but
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* it might be "neater" to call ext2_get_inode first and check
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* if the inode is valid.....
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*/
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inode = iget(sb, ino);
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if (inode == NULL)
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|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
|
if (is_bad_inode(inode) ||
|
|
|
|
|
(generation && inode->i_generation != generation)) {
|
|
|
|
|
/* we didn't find the right inode.. */
|
|
|
|
|
iput(inode);
|
|
|
|
|
return ERR_PTR(-ESTALE);
|
|
|
|
|
}
|
|
|
|
|
/* now to find a dentry.
|
|
|
|
|
* If possible, get a well-connected one
|
|
|
|
|
*/
|
|
|
|
|
result = d_alloc_anon(inode);
|
|
|
|
|
if (!result) {
|
|
|
|
|
iput(inode);
|
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
|
}
|
|
|
|
|
return result;
|
|
|
|
|
}
|
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/* Yes, most of these are left as NULL!!
|
|
|
|
|
* A NULL value implies the default, which works with ext2-like file
|
|
|
|
|
* systems, but can be improved upon.
|
|
|
|
|
* Currently only get_parent is required.
|
|
|
|
|
*/
|
|
|
|
|
static struct export_operations ext2_export_ops = {
|
|
|
|
|
.get_parent = ext2_get_parent,
|
2006-09-17 03:15:37 +08:00
|
|
|
.get_dentry = ext2_get_dentry,
|
2005-04-17 06:20:36 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static unsigned long get_sb_block(void **data)
|
|
|
|
|
{
|
|
|
|
|
unsigned long sb_block;
|
|
|
|
|
char *options = (char *) *data;
|
|
|
|
|
|
|
|
|
|
if (!options || strncmp(options, "sb=", 3) != 0)
|
|
|
|
|
return 1; /* Default location */
|
|
|
|
|
options += 3;
|
|
|
|
|
sb_block = simple_strtoul(options, &options, 0);
|
|
|
|
|
if (*options && *options != ',') {
|
|
|
|
|
printk("EXT2-fs: Invalid sb specification: %s\n",
|
|
|
|
|
(char *) *data);
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
if (*options == ',')
|
|
|
|
|
options++;
|
|
|
|
|
*data = (void *) options;
|
|
|
|
|
return sb_block;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
enum {
|
|
|
|
|
Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
|
2005-09-07 06:16:54 +08:00
|
|
|
Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic,
|
2005-11-09 13:34:59 +08:00
|
|
|
Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug,
|
2005-09-07 06:16:54 +08:00
|
|
|
Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr,
|
|
|
|
|
Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota,
|
|
|
|
|
Opt_usrquota, Opt_grpquota
|
2005-04-17 06:20:36 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static match_table_t tokens = {
|
|
|
|
|
{Opt_bsd_df, "bsddf"},
|
|
|
|
|
{Opt_minix_df, "minixdf"},
|
|
|
|
|
{Opt_grpid, "grpid"},
|
|
|
|
|
{Opt_grpid, "bsdgroups"},
|
|
|
|
|
{Opt_nogrpid, "nogrpid"},
|
|
|
|
|
{Opt_nogrpid, "sysvgroups"},
|
|
|
|
|
{Opt_resgid, "resgid=%u"},
|
|
|
|
|
{Opt_resuid, "resuid=%u"},
|
|
|
|
|
{Opt_sb, "sb=%u"},
|
|
|
|
|
{Opt_err_cont, "errors=continue"},
|
|
|
|
|
{Opt_err_panic, "errors=panic"},
|
|
|
|
|
{Opt_err_ro, "errors=remount-ro"},
|
|
|
|
|
{Opt_nouid32, "nouid32"},
|
|
|
|
|
{Opt_nocheck, "check=none"},
|
|
|
|
|
{Opt_nocheck, "nocheck"},
|
|
|
|
|
{Opt_debug, "debug"},
|
|
|
|
|
{Opt_oldalloc, "oldalloc"},
|
|
|
|
|
{Opt_orlov, "orlov"},
|
|
|
|
|
{Opt_nobh, "nobh"},
|
|
|
|
|
{Opt_user_xattr, "user_xattr"},
|
|
|
|
|
{Opt_nouser_xattr, "nouser_xattr"},
|
|
|
|
|
{Opt_acl, "acl"},
|
|
|
|
|
{Opt_noacl, "noacl"},
|
2005-06-24 13:05:26 +08:00
|
|
|
{Opt_xip, "xip"},
|
2005-09-07 06:16:54 +08:00
|
|
|
{Opt_grpquota, "grpquota"},
|
2005-04-17 06:20:36 +08:00
|
|
|
{Opt_ignore, "noquota"},
|
2005-09-07 06:16:54 +08:00
|
|
|
{Opt_quota, "quota"},
|
|
|
|
|
{Opt_usrquota, "usrquota"},
|
2005-04-17 06:20:36 +08:00
|
|
|
{Opt_err, NULL}
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static int parse_options (char * options,
|
|
|
|
|
struct ext2_sb_info *sbi)
|
|
|
|
|
{
|
|
|
|
|
char * p;
|
|
|
|
|
substring_t args[MAX_OPT_ARGS];
|
|
|
|
|
int option;
|
|
|
|
|
|
|
|
|
|
if (!options)
|
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
|
|
while ((p = strsep (&options, ",")) != NULL) {
|
|
|
|
|
int token;
|
|
|
|
|
if (!*p)
|
|
|
|
|
continue;
|
|
|
|
|
|
|
|
|
|
token = match_token(p, tokens, args);
|
|
|
|
|
switch (token) {
|
|
|
|
|
case Opt_bsd_df:
|
|
|
|
|
clear_opt (sbi->s_mount_opt, MINIX_DF);
|
|
|
|
|
break;
|
|
|
|
|
case Opt_minix_df:
|
|
|
|
|
set_opt (sbi->s_mount_opt, MINIX_DF);
|
|
|
|
|
break;
|
|
|
|
|
case Opt_grpid:
|
|
|
|
|
set_opt (sbi->s_mount_opt, GRPID);
|
|
|
|
|
break;
|
|
|
|
|
case Opt_nogrpid:
|
|
|
|
|
clear_opt (sbi->s_mount_opt, GRPID);
|
|
|
|
|
break;
|
|
|
|
|
case Opt_resuid:
|
|
|
|
|
if (match_int(&args[0], &option))
|
|
|
|
|
return 0;
|
|
|
|
|
sbi->s_resuid = option;
|
|
|
|
|
break;
|
|
|
|
|
case Opt_resgid:
|
|
|
|
|
if (match_int(&args[0], &option))
|
|
|
|
|
return 0;
|
|
|
|
|
sbi->s_resgid = option;
|
|
|
|
|
break;
|
|
|
|
|
case Opt_sb:
|
|
|
|
|
/* handled by get_sb_block() instead of here */
|
|
|
|
|
/* *sb_block = match_int(&args[0]); */
|
|
|
|
|
break;
|
|
|
|
|
case Opt_err_panic:
|
2006-10-11 16:21:50 +08:00
|
|
|
clear_opt (sbi->s_mount_opt, ERRORS_CONT);
|
|
|
|
|
clear_opt (sbi->s_mount_opt, ERRORS_RO);
|
|
|
|
|
set_opt (sbi->s_mount_opt, ERRORS_PANIC);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
|
case Opt_err_ro:
|
2006-10-11 16:21:50 +08:00
|
|
|
clear_opt (sbi->s_mount_opt, ERRORS_CONT);
|
|
|
|
|
clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
|
|
|
|
|
set_opt (sbi->s_mount_opt, ERRORS_RO);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
|
case Opt_err_cont:
|
2006-10-11 16:21:50 +08:00
|
|
|
clear_opt (sbi->s_mount_opt, ERRORS_RO);
|
|
|
|
|
clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
|
|
|
|
|
set_opt (sbi->s_mount_opt, ERRORS_CONT);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
|
case Opt_nouid32:
|
|
|
|
|
set_opt (sbi->s_mount_opt, NO_UID32);
|
|
|
|
|
break;
|
|
|
|
|
case Opt_nocheck:
|
|
|
|
|
clear_opt (sbi->s_mount_opt, CHECK);
|
|
|
|
|
break;
|
|
|
|
|
case Opt_debug:
|
|
|
|
|
set_opt (sbi->s_mount_opt, DEBUG);
|
|
|
|
|
break;
|
|
|
|
|
case Opt_oldalloc:
|
|
|
|
|
set_opt (sbi->s_mount_opt, OLDALLOC);
|
|
|
|
|
break;
|
|
|
|
|
case Opt_orlov:
|
|
|
|
|
clear_opt (sbi->s_mount_opt, OLDALLOC);
|
|
|
|
|
break;
|
|
|
|
|
case Opt_nobh:
|
|
|
|
|
set_opt (sbi->s_mount_opt, NOBH);
|
|
|
|
|
break;
|
|
|
|
|
#ifdef CONFIG_EXT2_FS_XATTR
|
|
|
|
|
case Opt_user_xattr:
|
|
|
|
|
set_opt (sbi->s_mount_opt, XATTR_USER);
|
|
|
|
|
break;
|
|
|
|
|
case Opt_nouser_xattr:
|
|
|
|
|
clear_opt (sbi->s_mount_opt, XATTR_USER);
|
|
|
|
|
break;
|
|
|
|
|
#else
|
|
|
|
|
case Opt_user_xattr:
|
|
|
|
|
case Opt_nouser_xattr:
|
|
|
|
|
printk("EXT2 (no)user_xattr options not supported\n");
|
|
|
|
|
break;
|
|
|
|
|
#endif
|
|
|
|
|
#ifdef CONFIG_EXT2_FS_POSIX_ACL
|
|
|
|
|
case Opt_acl:
|
|
|
|
|
set_opt(sbi->s_mount_opt, POSIX_ACL);
|
|
|
|
|
break;
|
|
|
|
|
case Opt_noacl:
|
|
|
|
|
clear_opt(sbi->s_mount_opt, POSIX_ACL);
|
|
|
|
|
break;
|
|
|
|
|
#else
|
|
|
|
|
case Opt_acl:
|
|
|
|
|
case Opt_noacl:
|
|
|
|
|
printk("EXT2 (no)acl options not supported\n");
|
|
|
|
|
break;
|
|
|
|
|
#endif
|
2005-06-24 13:05:26 +08:00
|
|
|
case Opt_xip:
|
|
|
|
|
#ifdef CONFIG_EXT2_FS_XIP
|
|
|
|
|
set_opt (sbi->s_mount_opt, XIP);
|
|
|
|
|
#else
|
|
|
|
|
printk("EXT2 xip option not supported\n");
|
|
|
|
|
#endif
|
|
|
|
|
break;
|
2005-09-07 06:16:54 +08:00
|
|
|
|
|
|
|
|
#if defined(CONFIG_QUOTA)
|
|
|
|
|
case Opt_quota:
|
|
|
|
|
case Opt_usrquota:
|
|
|
|
|
set_opt(sbi->s_mount_opt, USRQUOTA);
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case Opt_grpquota:
|
|
|
|
|
set_opt(sbi->s_mount_opt, GRPQUOTA);
|
|
|
|
|
break;
|
|
|
|
|
#else
|
|
|
|
|
case Opt_quota:
|
|
|
|
|
case Opt_usrquota:
|
|
|
|
|
case Opt_grpquota:
|
|
|
|
|
printk(KERN_ERR
|
|
|
|
|
"EXT2-fs: quota operations not supported.\n");
|
|
|
|
|
|
|
|
|
|
break;
|
|
|
|
|
#endif
|
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
case Opt_ignore:
|
|
|
|
|
break;
|
|
|
|
|
default:
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int ext2_setup_super (struct super_block * sb,
|
|
|
|
|
struct ext2_super_block * es,
|
|
|
|
|
int read_only)
|
|
|
|
|
{
|
|
|
|
|
int res = 0;
|
|
|
|
|
struct ext2_sb_info *sbi = EXT2_SB(sb);
|
|
|
|
|
|
|
|
|
|
if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) {
|
|
|
|
|
printk ("EXT2-fs warning: revision level too high, "
|
|
|
|
|
"forcing read-only mode\n");
|
|
|
|
|
res = MS_RDONLY;
|
|
|
|
|
}
|
|
|
|
|
if (read_only)
|
|
|
|
|
return res;
|
|
|
|
|
if (!(sbi->s_mount_state & EXT2_VALID_FS))
|
|
|
|
|
printk ("EXT2-fs warning: mounting unchecked fs, "
|
|
|
|
|
"running e2fsck is recommended\n");
|
|
|
|
|
else if ((sbi->s_mount_state & EXT2_ERROR_FS))
|
|
|
|
|
printk ("EXT2-fs warning: mounting fs with errors, "
|
|
|
|
|
"running e2fsck is recommended\n");
|
|
|
|
|
else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
|
|
|
|
|
le16_to_cpu(es->s_mnt_count) >=
|
|
|
|
|
(unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
|
|
|
|
|
printk ("EXT2-fs warning: maximal mount count reached, "
|
|
|
|
|
"running e2fsck is recommended\n");
|
|
|
|
|
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);
|
2006-09-27 16:49:30 +08:00
|
|
|
unsigned long first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
|
|
|
|
|
unsigned long last_block;
|
2005-04-17 06:20:36 +08:00
|
|
|
struct ext2_group_desc * gdp = NULL;
|
|
|
|
|
|
|
|
|
|
ext2_debug ("Checking group descriptors");
|
|
|
|
|
|
|
|
|
|
for (i = 0; i < sbi->s_groups_count; i++)
|
|
|
|
|
{
|
2006-09-27 16:49:30 +08:00
|
|
|
if (i == sbi->s_groups_count - 1)
|
|
|
|
|
last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
|
|
|
|
|
else
|
|
|
|
|
last_block = first_block +
|
|
|
|
|
(EXT2_BLOCKS_PER_GROUP(sb) - 1);
|
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
|
|
|
|
|
gdp = (struct ext2_group_desc *) sbi->s_group_desc[desc_block++]->b_data;
|
2006-09-27 16:49:30 +08:00
|
|
|
if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
|
|
|
|
|
le32_to_cpu(gdp->bg_block_bitmap) > last_block)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
|
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;
|
|
|
|
|
}
|
2006-09-27 16:49:30 +08:00
|
|
|
if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
|
|
|
|
|
le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
|
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;
|
|
|
|
|
}
|
2006-09-27 16:49:30 +08:00
|
|
|
if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
|
|
|
|
|
le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >
|
|
|
|
|
last_block)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
|
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;
|
|
|
|
|
}
|
2006-09-27 16:49:30 +08:00
|
|
|
first_block += EXT2_BLOCKS_PER_GROUP(sb);
|
2005-04-17 06:20:36 +08:00
|
|
|
gdp++;
|
|
|
|
|
}
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* 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;
|
|
|
|
|
|
2006-09-27 16:49:37 +08:00
|
|
|
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
|
2005-04-17 06:20:36 +08:00
|
|
|
if (!sbi)
|
|
|
|
|
return -ENOMEM;
|
|
|
|
|
sb->s_fs_info = 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);
|
2007-02-10 17:46:13 +08:00
|
|
|
#ifdef CONFIG_EXT2_FS_XATTR
|
2005-04-17 06:20:36 +08:00
|
|
|
if (def_mount_opts & EXT2_DEFM_XATTR_USER)
|
|
|
|
|
set_opt(sbi->s_mount_opt, XATTR_USER);
|
2007-02-10 17:46:13 +08:00
|
|
|
#endif
|
|
|
|
|
#ifdef CONFIG_EXT2_FS_POSIX_ACL
|
2005-04-17 06:20:36 +08:00
|
|
|
if (def_mount_opts & EXT2_DEFM_ACL)
|
|
|
|
|
set_opt(sbi->s_mount_opt, POSIX_ACL);
|
2007-02-10 17:46:13 +08:00
|
|
|
#endif
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
|
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);
|
2006-10-11 16:21:50 +08:00
|
|
|
else
|
|
|
|
|
set_opt(sbi->s_mount_opt, ERRORS_CONT);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
|
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);
|
|
|
|
|
|
2005-06-24 13:05:26 +08:00
|
|
|
ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
|
|
|
|
|
EXT2_MOUNT_XIP if not */
|
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
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);
|
|
|
|
|
|
2005-06-24 13:05:26 +08:00
|
|
|
if ((ext2_use_xip(sb)) && ((blocksize != PAGE_SIZE) ||
|
|
|
|
|
(sb->s_blocksize != blocksize))) {
|
|
|
|
|
if (!silent)
|
|
|
|
|
printk("XIP: Unsupported blocksize\n");
|
|
|
|
|
goto failed_mount;
|
|
|
|
|
}
|
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/* 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);
|
2006-08-27 16:23:43 +08:00
|
|
|
if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
|
2005-04-17 06:20:36 +08:00
|
|
|
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 =
|
2006-12-08 18:37:49 +08:00
|
|
|
ilog2 (EXT2_ADDR_PER_BLOCK(sb));
|
2005-04-17 06:20:36 +08:00
|
|
|
sbi->s_desc_per_block_bits =
|
2006-12-08 18:37:49 +08:00
|
|
|
ilog2 (EXT2_DESC_PER_BLOCK(sb));
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
|
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;
|
2006-09-27 16:49:30 +08:00
|
|
|
sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
|
|
|
|
|
le32_to_cpu(es->s_first_data_block) - 1)
|
|
|
|
|
/ EXT2_BLOCKS_PER_GROUP(sb)) + 1;
|
2005-04-17 06:20:36 +08:00
|
|
|
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);
|
2006-06-23 17:05:41 +08:00
|
|
|
|
|
|
|
|
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));
|
2005-04-17 06:20:36 +08:00
|
|
|
/*
|
|
|
|
|
* 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");
|
2006-06-23 17:05:41 +08:00
|
|
|
goto failed_mount3;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
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");
|
2006-06-23 17:05:41 +08:00
|
|
|
goto failed_mount3;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
|
|
|
|
|
ext2_warning(sb, __FUNCTION__,
|
2005-11-14 08:07:36 +08:00
|
|
|
"mounting ext3 filesystem as ext2");
|
2005-04-17 06:20:36 +08:00
|
|
|
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;
|
2006-06-23 17:05:41 +08:00
|
|
|
failed_mount3:
|
|
|
|
|
percpu_counter_destroy(&sbi->s_freeblocks_counter);
|
|
|
|
|
percpu_counter_destroy(&sbi->s_freeinodes_counter);
|
|
|
|
|
percpu_counter_destroy(&sbi->s_dirs_counter);
|
2005-04-17 06:20:36 +08:00
|
|
|
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;
|
2005-06-24 13:05:26 +08:00
|
|
|
unsigned long old_mount_opt = sbi->s_mount_opt;
|
2005-07-13 04:58:29 +08:00
|
|
|
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;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Allow the "check" option to be passed as a remount option.
|
|
|
|
|
*/
|
2005-07-13 04:58:29 +08:00
|
|
|
if (!parse_options (data, sbi)) {
|
|
|
|
|
err = -EINVAL;
|
|
|
|
|
goto restore_opts;
|
|
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
|
sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
|
|
|
|
|
((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
|
|
|
|
|
|
2007-06-24 08:16:46 +08:00
|
|
|
ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
|
|
|
|
|
EXT2_MOUNT_XIP if not */
|
|
|
|
|
|
|
|
|
|
if ((ext2_use_xip(sb)) && (sb->s_blocksize != PAGE_SIZE)) {
|
|
|
|
|
printk("XIP: Unsupported blocksize\n");
|
2007-06-28 05:10:08 +08:00
|
|
|
err = -EINVAL;
|
2007-06-24 08:16:46 +08:00
|
|
|
goto restore_opts;
|
|
|
|
|
}
|
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
es = sbi->s_es;
|
2005-06-24 13:05:26 +08:00
|
|
|
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)");
|
2005-04-17 06:20:36 +08:00
|
|
|
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));
|
2005-07-13 04:58:29 +08:00
|
|
|
err = -EROFS;
|
|
|
|
|
goto restore_opts;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
/*
|
|
|
|
|
* 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;
|
2005-07-13 04:58:29 +08:00
|
|
|
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;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
2006-06-23 17:02:58 +08:00
|
|
|
static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2006-06-23 17:02:58 +08:00
|
|
|
struct super_block *sb = dentry->d_sb;
|
2005-04-17 06:20:36 +08:00
|
|
|
struct ext2_sb_info *sbi = EXT2_SB(sb);
|
2006-12-07 12:35:27 +08:00
|
|
|
struct ext2_super_block *es = sbi->s_es;
|
|
|
|
|
u64 fsid;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
|
if (test_opt (sb, MINIX_DF))
|
2007-07-16 14:41:58 +08:00
|
|
|
sbi->s_overhead_last = 0;
|
|
|
|
|
else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
|
|
|
|
|
unsigned long i, overhead = 0;
|
|
|
|
|
smp_rmb();
|
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/*
|
2007-07-16 14:41:58 +08:00
|
|
|
* Compute the overhead (FS structures). This is constant
|
|
|
|
|
* for a given filesystem unless the number of block groups
|
|
|
|
|
* changes so we cache the previous value until it does.
|
2005-04-17 06:20:36 +08:00
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* All of the blocks before first_data_block are
|
|
|
|
|
* overhead
|
|
|
|
|
*/
|
2006-12-07 12:35:27 +08:00
|
|
|
overhead = le32_to_cpu(es->s_first_data_block);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* 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));
|
2007-07-16 14:41:58 +08:00
|
|
|
sbi->s_overhead_last = overhead;
|
|
|
|
|
smp_wmb();
|
|
|
|
|
sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
buf->f_type = EXT2_SUPER_MAGIC;
|
|
|
|
|
buf->f_bsize = sb->s_blocksize;
|
2007-07-16 14:41:58 +08:00
|
|
|
buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
|
2005-04-17 06:20:36 +08:00
|
|
|
buf->f_bfree = ext2_count_free_blocks(sb);
|
2007-07-16 14:41:58 +08:00
|
|
|
es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
|
2006-12-07 12:35:27 +08:00
|
|
|
buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
|
|
|
|
|
if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
|
2005-04-17 06:20:36 +08:00
|
|
|
buf->f_bavail = 0;
|
2006-12-07 12:35:27 +08:00
|
|
|
buf->f_files = le32_to_cpu(es->s_inodes_count);
|
|
|
|
|
buf->f_ffree = ext2_count_free_inodes(sb);
|
2007-07-16 14:41:58 +08:00
|
|
|
es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
|
2005-04-17 06:20:36 +08:00
|
|
|
buf->f_namelen = EXT2_NAME_LEN;
|
2006-12-07 12:35:27 +08:00
|
|
|
fsid = le64_to_cpup((void *)es->s_uuid) ^
|
|
|
|
|
le64_to_cpup((void *)es->s_uuid + sizeof(u64));
|
|
|
|
|
buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
|
|
|
|
|
buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
|
2005-04-17 06:20:36 +08:00
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
[PATCH] VFS: Permit filesystem to override root dentry on mount
Extend the get_sb() filesystem operation to take an extra argument that
permits the VFS to pass in the target vfsmount that defines the mountpoint.
The filesystem is then required to manually set the superblock and root dentry
pointers. For most filesystems, this should be done with simple_set_mnt()
which will set the superblock pointer and then set the root dentry to the
superblock's s_root (as per the old default behaviour).
The get_sb() op now returns an integer as there's now no need to return the
superblock pointer.
This patch permits a superblock to be implicitly shared amongst several mount
points, such as can be done with NFS to avoid potential inode aliasing. In
such a case, simple_set_mnt() would not be called, and instead the mnt_root
and mnt_sb would be set directly.
The patch also makes the following changes:
(*) the get_sb_*() convenience functions in the core kernel now take a vfsmount
pointer argument and return an integer, so most filesystems have to change
very little.
(*) If one of the convenience function is not used, then get_sb() should
normally call simple_set_mnt() to instantiate the vfsmount. This will
always return 0, and so can be tail-called from get_sb().
(*) generic_shutdown_super() now calls shrink_dcache_sb() to clean up the
dcache upon superblock destruction rather than shrink_dcache_anon().
This is required because the superblock may now have multiple trees that
aren't actually bound to s_root, but that still need to be cleaned up. The
currently called functions assume that the whole tree is rooted at s_root,
and that anonymous dentries are not the roots of trees which results in
dentries being left unculled.
However, with the way NFS superblock sharing are currently set to be
implemented, these assumptions are violated: the root of the filesystem is
simply a dummy dentry and inode (the real inode for '/' may well be
inaccessible), and all the vfsmounts are rooted on anonymous[*] dentries
with child trees.
[*] Anonymous until discovered from another tree.
(*) The documentation has been adjusted, including the additional bit of
changing ext2_* into foo_* in the documentation.
[akpm@osdl.org: convert ipath_fs, do other stuff]
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Nathan Scott <nathans@sgi.com>
Cc: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-23 17:02:57 +08:00
|
|
|
static int ext2_get_sb(struct file_system_type *fs_type,
|
|
|
|
|
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
[PATCH] VFS: Permit filesystem to override root dentry on mount
Extend the get_sb() filesystem operation to take an extra argument that
permits the VFS to pass in the target vfsmount that defines the mountpoint.
The filesystem is then required to manually set the superblock and root dentry
pointers. For most filesystems, this should be done with simple_set_mnt()
which will set the superblock pointer and then set the root dentry to the
superblock's s_root (as per the old default behaviour).
The get_sb() op now returns an integer as there's now no need to return the
superblock pointer.
This patch permits a superblock to be implicitly shared amongst several mount
points, such as can be done with NFS to avoid potential inode aliasing. In
such a case, simple_set_mnt() would not be called, and instead the mnt_root
and mnt_sb would be set directly.
The patch also makes the following changes:
(*) the get_sb_*() convenience functions in the core kernel now take a vfsmount
pointer argument and return an integer, so most filesystems have to change
very little.
(*) If one of the convenience function is not used, then get_sb() should
normally call simple_set_mnt() to instantiate the vfsmount. This will
always return 0, and so can be tail-called from get_sb().
(*) generic_shutdown_super() now calls shrink_dcache_sb() to clean up the
dcache upon superblock destruction rather than shrink_dcache_anon().
This is required because the superblock may now have multiple trees that
aren't actually bound to s_root, but that still need to be cleaned up. The
currently called functions assume that the whole tree is rooted at s_root,
and that anonymous dentries are not the roots of trees which results in
dentries being left unculled.
However, with the way NFS superblock sharing are currently set to be
implemented, these assumptions are violated: the root of the filesystem is
simply a dummy dentry and inode (the real inode for '/' may well be
inaccessible), and all the vfsmounts are rooted on anonymous[*] dentries
with child trees.
[*] Anonymous until discovered from another tree.
(*) The documentation has been adjusted, including the additional bit of
changing ext2_* into foo_* in the documentation.
[akpm@osdl.org: convert ipath_fs, do other stuff]
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Nathan Scott <nathans@sgi.com>
Cc: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-23 17:02:57 +08:00
|
|
|
return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super, mnt);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#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;
|
|
|
|
|
|
2006-07-03 15:25:20 +08:00
|
|
|
mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
|
2005-04-17 06:20:36 +08:00
|
|
|
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);
|
2006-01-10 07:59:24 +08:00
|
|
|
mutex_unlock(&inode->i_mutex);
|
2005-04-17 06:20:36 +08:00
|
|
|
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)
|