super.c 81.3 KB
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/*
 *  linux/fs/ext3/super.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/inode.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller (davem@caip.rutgers.edu), 1995
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/time.h>
#include <linux/jbd.h>
#include <linux/ext3_fs.h>
#include <linux/ext3_jbd.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/parser.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
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#include <linux/exportfs.h>
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#include <linux/vfs.h>
#include <linux/random.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/quotaops.h>
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#include <linux/seq_file.h>
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#include <linux/log2.h>
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#include <asm/uaccess.h>
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#include "xattr.h"
#include "acl.h"
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#include "namei.h"
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static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
			     unsigned long journal_devnum);
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static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
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			       unsigned int);
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static void ext3_commit_super (struct super_block * sb,
			       struct ext3_super_block * es,
			       int sync);
static void ext3_mark_recovery_complete(struct super_block * sb,
					struct ext3_super_block * es);
static void ext3_clear_journal_err(struct super_block * sb,
				   struct ext3_super_block * es);
static int ext3_sync_fs(struct super_block *sb, int wait);
static const char *ext3_decode_error(struct super_block * sb, int errno,
				     char nbuf[16]);
static int ext3_remount (struct super_block * sb, int * flags, char * data);
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static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
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static void ext3_unlockfs(struct super_block *sb);
static void ext3_write_super (struct super_block * sb);
static void ext3_write_super_lockfs(struct super_block *sb);

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/*
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 * Wrappers for journal_start/end.
 *
 * The only special thing we need to do here is to make sure that all
 * journal_end calls result in the superblock being marked dirty, so
 * that sync() will call the filesystem's write_super callback if
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 * appropriate.
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 */
handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
{
	journal_t *journal;

	if (sb->s_flags & MS_RDONLY)
		return ERR_PTR(-EROFS);

	/* Special case here: if the journal has aborted behind our
	 * backs (eg. EIO in the commit thread), then we still need to
	 * take the FS itself readonly cleanly. */
	journal = EXT3_SB(sb)->s_journal;
	if (is_journal_aborted(journal)) {
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		ext3_abort(sb, __func__,
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			   "Detected aborted journal");
		return ERR_PTR(-EROFS);
	}

	return journal_start(journal, nblocks);
}

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/*
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 * The only special thing we need to do here is to make sure that all
 * journal_stop calls result in the superblock being marked dirty, so
 * that sync() will call the filesystem's write_super callback if
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 * appropriate.
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 */
int __ext3_journal_stop(const char *where, handle_t *handle)
{
	struct super_block *sb;
	int err;
	int rc;

	sb = handle->h_transaction->t_journal->j_private;
	err = handle->h_err;
	rc = journal_stop(handle);

	if (!err)
		err = rc;
	if (err)
		__ext3_std_error(sb, where, err);
	return err;
}

void ext3_journal_abort_handle(const char *caller, const char *err_fn,
		struct buffer_head *bh, handle_t *handle, int err)
{
	char nbuf[16];
	const char *errstr = ext3_decode_error(NULL, err, nbuf);

	if (bh)
		BUFFER_TRACE(bh, "abort");

	if (!handle->h_err)
		handle->h_err = err;

	if (is_handle_aborted(handle))
		return;

	printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
	       caller, errstr, err_fn);

	journal_abort_handle(handle);
}

/* Deal with the reporting of failure conditions on a filesystem such as
 * inconsistencies detected or read IO failures.
 *
 * On ext2, we can store the error state of the filesystem in the
 * superblock.  That is not possible on ext3, because we may have other
 * write ordering constraints on the superblock which prevent us from
 * writing it out straight away; and given that the journal is about to
 * be aborted, we can't rely on the current, or future, transactions to
 * write out the superblock safely.
 *
 * We'll just use the journal_abort() error code to record an error in
 * the journal instead.  On recovery, the journal will compain about
 * that error until we've noted it down and cleared it.
 */

static void ext3_handle_error(struct super_block *sb)
{
	struct ext3_super_block *es = EXT3_SB(sb)->s_es;

	EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
	es->s_state |= cpu_to_le16(EXT3_ERROR_FS);

	if (sb->s_flags & MS_RDONLY)
		return;

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	if (!test_opt (sb, ERRORS_CONT)) {
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		journal_t *journal = EXT3_SB(sb)->s_journal;

		EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
		if (journal)
			journal_abort(journal, -EIO);
	}
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	if (test_opt (sb, ERRORS_RO)) {
		printk (KERN_CRIT "Remounting filesystem read-only\n");
		sb->s_flags |= MS_RDONLY;
	}
	ext3_commit_super(sb, es, 1);
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	if (test_opt(sb, ERRORS_PANIC))
		panic("EXT3-fs (device %s): panic forced after error\n",
			sb->s_id);
}

void ext3_error (struct super_block * sb, const char * function,
		 const char * fmt, ...)
{
	va_list args;

	va_start(args, fmt);
	printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
	vprintk(fmt, args);
	printk("\n");
	va_end(args);

	ext3_handle_error(sb);
}

static const char *ext3_decode_error(struct super_block * sb, int errno,
				     char nbuf[16])
{
	char *errstr = NULL;

	switch (errno) {
	case -EIO:
		errstr = "IO failure";
		break;
	case -ENOMEM:
		errstr = "Out of memory";
		break;
	case -EROFS:
		if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
			errstr = "Journal has aborted";
		else
			errstr = "Readonly filesystem";
		break;
	default:
		/* If the caller passed in an extra buffer for unknown
		 * errors, textualise them now.  Else we just return
		 * NULL. */
		if (nbuf) {
			/* Check for truncated error codes... */
			if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
				errstr = nbuf;
		}
		break;
	}

	return errstr;
}

/* __ext3_std_error decodes expected errors from journaling functions
 * automatically and invokes the appropriate error response.  */

void __ext3_std_error (struct super_block * sb, const char * function,
		       int errno)
{
	char nbuf[16];
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	const char *errstr;
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	/* Special case: if the error is EROFS, and we're not already
	 * inside a transaction, then there's really no point in logging
	 * an error. */
	if (errno == -EROFS && journal_current_handle() == NULL &&
	    (sb->s_flags & MS_RDONLY))
		return;

	errstr = ext3_decode_error(sb, errno, nbuf);
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	printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
		sb->s_id, function, errstr);

	ext3_handle_error(sb);
}

/*
 * ext3_abort is a much stronger failure handler than ext3_error.  The
 * abort function may be used to deal with unrecoverable failures such
 * as journal IO errors or ENOMEM at a critical moment in log management.
 *
 * We unconditionally force the filesystem into an ABORT|READONLY state,
 * unless the error response on the fs has been set to panic in which
 * case we take the easy way out and panic immediately.
 */

void ext3_abort (struct super_block * sb, const char * function,
		 const char * fmt, ...)
{
	va_list args;

	printk (KERN_CRIT "ext3_abort called.\n");

	va_start(args, fmt);
	printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
	vprintk(fmt, args);
	printk("\n");
	va_end(args);

	if (test_opt(sb, ERRORS_PANIC))
		panic("EXT3-fs panic from previous error\n");

	if (sb->s_flags & MS_RDONLY)
		return;

	printk(KERN_CRIT "Remounting filesystem read-only\n");
	EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
	sb->s_flags |= MS_RDONLY;
	EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
	journal_abort(EXT3_SB(sb)->s_journal, -EIO);
}

void ext3_warning (struct super_block * sb, const char * function,
		   const char * fmt, ...)
{
	va_list args;

	va_start(args, fmt);
	printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
	       sb->s_id, function);
	vprintk(fmt, args);
	printk("\n");
	va_end(args);
}

void ext3_update_dynamic_rev(struct super_block *sb)
{
	struct ext3_super_block *es = EXT3_SB(sb)->s_es;

	if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
		return;

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	ext3_warning(sb, __func__,
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		     "updating to rev %d because of new feature flag, "
		     "running e2fsck is recommended",
		     EXT3_DYNAMIC_REV);

	es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
	es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
	es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
	/* leave es->s_feature_*compat flags alone */
	/* es->s_uuid will be set by e2fsck if empty */

	/*
	 * The rest of the superblock fields should be zero, and if not it
	 * means they are likely already in use, so leave them alone.  We
	 * can leave it up to e2fsck to clean up any inconsistencies there.
	 */
}

/*
 * Open the external journal device
 */
static struct block_device *ext3_blkdev_get(dev_t dev)
{
	struct block_device *bdev;
	char b[BDEVNAME_SIZE];

	bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
	if (IS_ERR(bdev))
		goto fail;
	return bdev;

fail:
	printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
			__bdevname(dev, b), PTR_ERR(bdev));
	return NULL;
}

/*
 * Release the journal device
 */
static int ext3_blkdev_put(struct block_device *bdev)
{
	bd_release(bdev);
	return blkdev_put(bdev);
}

static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
{
	struct block_device *bdev;
	int ret = -ENODEV;

	bdev = sbi->journal_bdev;
	if (bdev) {
		ret = ext3_blkdev_put(bdev);
		sbi->journal_bdev = NULL;
	}
	return ret;
}

static inline struct inode *orphan_list_entry(struct list_head *l)
{
	return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
}

static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
{
	struct list_head *l;

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	printk(KERN_ERR "sb orphan head is %d\n",
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	       le32_to_cpu(sbi->s_es->s_last_orphan));

	printk(KERN_ERR "sb_info orphan list:\n");
	list_for_each(l, &sbi->s_orphan) {
		struct inode *inode = orphan_list_entry(l);
		printk(KERN_ERR "  "
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		       "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
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		       inode->i_sb->s_id, inode->i_ino, inode,
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		       inode->i_mode, inode->i_nlink,
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		       NEXT_ORPHAN(inode));
	}
}

static void ext3_put_super (struct super_block * sb)
{
	struct ext3_sb_info *sbi = EXT3_SB(sb);
	struct ext3_super_block *es = sbi->s_es;
	int i;

	ext3_xattr_put_super(sb);
	journal_destroy(sbi->s_journal);
	if (!(sb->s_flags & MS_RDONLY)) {
		EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
		es->s_state = cpu_to_le16(sbi->s_mount_state);
		BUFFER_TRACE(sbi->s_sbh, "marking dirty");
		mark_buffer_dirty(sbi->s_sbh);
		ext3_commit_super(sb, es, 1);
	}

	for (i = 0; i < sbi->s_gdb_count; i++)
		brelse(sbi->s_group_desc[i]);
	kfree(sbi->s_group_desc);
	percpu_counter_destroy(&sbi->s_freeblocks_counter);
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
	brelse(sbi->s_sbh);
#ifdef CONFIG_QUOTA
	for (i = 0; i < MAXQUOTAS; i++)
		kfree(sbi->s_qf_names[i]);
#endif

	/* Debugging code just in case the in-memory inode orphan list
	 * isn't empty.  The on-disk one can be non-empty if we've
	 * detected an error and taken the fs readonly, but the
	 * in-memory list had better be clean by this point. */
	if (!list_empty(&sbi->s_orphan))
		dump_orphan_list(sb, sbi);
	J_ASSERT(list_empty(&sbi->s_orphan));

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	invalidate_bdev(sb->s_bdev);
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	if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
		/*
		 * Invalidate the journal device's buffers.  We don't want them
		 * floating about in memory - the physical journal device may
		 * hotswapped, and it breaks the `ro-after' testing code.
		 */
		sync_blockdev(sbi->journal_bdev);
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		invalidate_bdev(sbi->journal_bdev);
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		ext3_blkdev_remove(sbi);
	}
	sb->s_fs_info = NULL;
	kfree(sbi);
	return;
}

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static struct kmem_cache *ext3_inode_cachep;
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/*
 * Called inside transaction, so use GFP_NOFS
 */
static struct inode *ext3_alloc_inode(struct super_block *sb)
{
	struct ext3_inode_info *ei;

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	ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS);
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	if (!ei)
		return NULL;
#ifdef CONFIG_EXT3_FS_POSIX_ACL
	ei->i_acl = EXT3_ACL_NOT_CACHED;
	ei->i_default_acl = EXT3_ACL_NOT_CACHED;
#endif
	ei->i_block_alloc_info = NULL;
	ei->vfs_inode.i_version = 1;
	return &ei->vfs_inode;
}

static void ext3_destroy_inode(struct inode *inode)
{
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	if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
		printk("EXT3 Inode %p: orphan list check failed!\n",
			EXT3_I(inode));
		print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
				EXT3_I(inode), sizeof(struct ext3_inode_info),
				false);
		dump_stack();
	}
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	kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
}

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static void init_once(struct kmem_cache * cachep, void *foo)
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{
	struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;

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	INIT_LIST_HEAD(&ei->i_orphan);
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#ifdef CONFIG_EXT3_FS_XATTR
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	init_rwsem(&ei->xattr_sem);
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#endif
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	mutex_init(&ei->truncate_mutex);
	inode_init_once(&ei->vfs_inode);
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}
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static int init_inodecache(void)
{
	ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
					     sizeof(struct ext3_inode_info),
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					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
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					     init_once);
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	if (ext3_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
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	kmem_cache_destroy(ext3_inode_cachep);
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}

static void ext3_clear_inode(struct inode *inode)
{
	struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
#ifdef CONFIG_EXT3_FS_POSIX_ACL
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	if (EXT3_I(inode)->i_acl &&
			EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
		posix_acl_release(EXT3_I(inode)->i_acl);
		EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
	}
	if (EXT3_I(inode)->i_default_acl &&
			EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
		posix_acl_release(EXT3_I(inode)->i_default_acl);
		EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
	}
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#endif
	ext3_discard_reservation(inode);
	EXT3_I(inode)->i_block_alloc_info = NULL;
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	if (unlikely(rsv))
		kfree(rsv);
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}

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static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
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{
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#if defined(CONFIG_QUOTA)
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	struct ext3_sb_info *sbi = EXT3_SB(sb);
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	if (sbi->s_jquota_fmt)
		seq_printf(seq, ",jqfmt=%s",
		(sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");

	if (sbi->s_qf_names[USRQUOTA])
		seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);

	if (sbi->s_qf_names[GRPQUOTA])
		seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);

	if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
		seq_puts(seq, ",usrquota");

	if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
		seq_puts(seq, ",grpquota");
#endif
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}

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/*
 * Show an option if
 *  - it's set to a non-default value OR
 *  - if the per-sb default is different from the global default
 */
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static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
{
	struct super_block *sb = vfs->mnt_sb;
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	struct ext3_sb_info *sbi = EXT3_SB(sb);
	struct ext3_super_block *es = sbi->s_es;
	unsigned long def_mount_opts;

	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);

	if (sbi->s_sb_block != 1)
		seq_printf(seq, ",sb=%lu", sbi->s_sb_block);
	if (test_opt(sb, MINIX_DF))
		seq_puts(seq, ",minixdf");
	if (test_opt(sb, GRPID))
		seq_puts(seq, ",grpid");
	if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS))
		seq_puts(seq, ",nogrpid");
	if (sbi->s_resuid != EXT3_DEF_RESUID ||
	    le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) {
		seq_printf(seq, ",resuid=%u", sbi->s_resuid);
	}
	if (sbi->s_resgid != EXT3_DEF_RESGID ||
	    le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) {
		seq_printf(seq, ",resgid=%u", sbi->s_resgid);
	}
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	if (test_opt(sb, ERRORS_RO)) {
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		int def_errors = le16_to_cpu(es->s_errors);

		if (def_errors == EXT3_ERRORS_PANIC ||
582 583
		    def_errors == EXT3_ERRORS_CONTINUE) {
			seq_puts(seq, ",errors=remount-ro");
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		}
	}
586 587
	if (test_opt(sb, ERRORS_CONT))
		seq_puts(seq, ",errors=continue");
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	if (test_opt(sb, ERRORS_PANIC))
		seq_puts(seq, ",errors=panic");
	if (test_opt(sb, NO_UID32))
		seq_puts(seq, ",nouid32");
	if (test_opt(sb, DEBUG))
		seq_puts(seq, ",debug");
	if (test_opt(sb, OLDALLOC))
		seq_puts(seq, ",oldalloc");
#ifdef CONFIG_EXT3_FS_XATTR
	if (test_opt(sb, XATTR_USER))
		seq_puts(seq, ",user_xattr");
	if (!test_opt(sb, XATTR_USER) &&
	    (def_mount_opts & EXT3_DEFM_XATTR_USER)) {
		seq_puts(seq, ",nouser_xattr");
	}
#endif
#ifdef CONFIG_EXT3_FS_POSIX_ACL
	if (test_opt(sb, POSIX_ACL))
		seq_puts(seq, ",acl");
	if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL))
		seq_puts(seq, ",noacl");
#endif
	if (!test_opt(sb, RESERVATION))
		seq_puts(seq, ",noreservation");
	if (sbi->s_commit_interval) {
		seq_printf(seq, ",commit=%u",
			   (unsigned) (sbi->s_commit_interval / HZ));
	}
	if (test_opt(sb, BARRIER))
		seq_puts(seq, ",barrier=1");
	if (test_opt(sb, NOBH))
		seq_puts(seq, ",nobh");
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	if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
		seq_puts(seq, ",data=journal");
	else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
		seq_puts(seq, ",data=ordered");
	else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
		seq_puts(seq, ",data=writeback");

	ext3_show_quota_options(seq, sb);
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	return 0;
}
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static struct inode *ext3_nfs_get_inode(struct super_block *sb,
		u64 ino, u32 generation)
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{
	struct inode *inode;

	if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO)
		return ERR_PTR(-ESTALE);
	if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count))
		return ERR_PTR(-ESTALE);

	/* iget isn't really right if the inode is currently unallocated!!
	 *
	 * ext3_read_inode will return a bad_inode if the inode had been
	 * deleted, so we should be safe.
	 *
	 * Currently we don't know the generation for parent directory, so
	 * a generation of 0 means "accept any"
	 */
652 653 654 655
	inode = ext3_iget(sb, ino);
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (generation && inode->i_generation != generation) {
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		iput(inode);
		return ERR_PTR(-ESTALE);
	}
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	return inode;
}

static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid,
		int fh_len, int fh_type)
{
	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
				    ext3_nfs_get_inode);
}

static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid,
		int fh_len, int fh_type)
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
				    ext3_nfs_get_inode);
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}

677
#ifdef CONFIG_QUOTA
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#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))

static int ext3_dquot_initialize(struct inode *inode, int type);
static int ext3_dquot_drop(struct inode *inode);
static int ext3_write_dquot(struct dquot *dquot);
static int ext3_acquire_dquot(struct dquot *dquot);
static int ext3_release_dquot(struct dquot *dquot);
static int ext3_mark_dquot_dirty(struct dquot *dquot);
static int ext3_write_info(struct super_block *sb, int type);
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static int ext3_quota_on(struct super_block *sb, int type, int format_id,
				char *path, int remount);
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static int ext3_quota_on_mount(struct super_block *sb, int type);
static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
			       size_t len, loff_t off);
static ssize_t ext3_quota_write(struct super_block *sb, int type,
				const char *data, size_t len, loff_t off);

static struct dquot_operations ext3_quota_operations = {
	.initialize	= ext3_dquot_initialize,
	.drop		= ext3_dquot_drop,
	.alloc_space	= dquot_alloc_space,
	.alloc_inode	= dquot_alloc_inode,
	.free_space	= dquot_free_space,
	.free_inode	= dquot_free_inode,
	.transfer	= dquot_transfer,
	.write_dquot	= ext3_write_dquot,
	.acquire_dquot	= ext3_acquire_dquot,
	.release_dquot	= ext3_release_dquot,
	.mark_dirty	= ext3_mark_dquot_dirty,
	.write_info	= ext3_write_info
};

static struct quotactl_ops ext3_qctl_operations = {
	.quota_on	= ext3_quota_on,
	.quota_off	= vfs_quota_off,
	.quota_sync	= vfs_quota_sync,
	.get_info	= vfs_get_dqinfo,
	.set_info	= vfs_set_dqinfo,
	.get_dqblk	= vfs_get_dqblk,
	.set_dqblk	= vfs_set_dqblk
};
#endif

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static const struct super_operations ext3_sops = {
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	.alloc_inode	= ext3_alloc_inode,
	.destroy_inode	= ext3_destroy_inode,
	.write_inode	= ext3_write_inode,
	.dirty_inode	= ext3_dirty_inode,
	.delete_inode	= ext3_delete_inode,
	.put_super	= ext3_put_super,
	.write_super	= ext3_write_super,
	.sync_fs	= ext3_sync_fs,
	.write_super_lockfs = ext3_write_super_lockfs,
	.unlockfs	= ext3_unlockfs,
	.statfs		= ext3_statfs,
	.remount_fs	= ext3_remount,
	.clear_inode	= ext3_clear_inode,
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	.show_options	= ext3_show_options,
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#ifdef CONFIG_QUOTA
	.quota_read	= ext3_quota_read,
	.quota_write	= ext3_quota_write,
#endif
};

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static const struct export_operations ext3_export_ops = {
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	.fh_to_dentry = ext3_fh_to_dentry,
	.fh_to_parent = ext3_fh_to_parent,
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	.get_parent = ext3_get_parent,
};

enum {
	Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
	Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
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	Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
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	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
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	Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
755
	Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
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	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
758
	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
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	Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
	Opt_grpquota
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};

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, "nocheck"},
	{Opt_nocheck, "check=none"},
	{Opt_debug, "debug"},
	{Opt_oldalloc, "oldalloc"},
	{Opt_orlov, "orlov"},
	{Opt_user_xattr, "user_xattr"},
	{Opt_nouser_xattr, "nouser_xattr"},
	{Opt_acl, "acl"},
	{Opt_noacl, "noacl"},
	{Opt_reservation, "reservation"},
	{Opt_noreservation, "noreservation"},
	{Opt_noload, "noload"},
	{Opt_nobh, "nobh"},
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	{Opt_bh, "bh"},
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	{Opt_commit, "commit=%u"},
	{Opt_journal_update, "journal=update"},
	{Opt_journal_inum, "journal=%u"},
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	{Opt_journal_dev, "journal_dev=%u"},
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	{Opt_abort, "abort"},
	{Opt_data_journal, "data=journal"},
	{Opt_data_ordered, "data=ordered"},
	{Opt_data_writeback, "data=writeback"},
	{Opt_offusrjquota, "usrjquota="},
	{Opt_usrjquota, "usrjquota=%s"},
	{Opt_offgrpjquota, "grpjquota="},
	{Opt_grpjquota, "grpjquota=%s"},
	{Opt_jqfmt_vfsold, "jqfmt=vfsold"},
	{Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
805
	{Opt_grpquota, "grpquota"},
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	{Opt_noquota, "noquota"},
	{Opt_quota, "quota"},
808
	{Opt_usrquota, "usrquota"},
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	{Opt_barrier, "barrier=%u"},
	{Opt_resize, "resize"},
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	{Opt_err, NULL},
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};

814
static ext3_fsblk_t get_sb_block(void **data)
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{
816 817
	ext3_fsblk_t	sb_block;
	char		*options = (char *) *data;
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	if (!options || strncmp(options, "sb=", 3) != 0)
		return 1;	/* Default location */
	options += 3;
822
	/*todo: use simple_strtoll with >32bit ext3 */
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	sb_block = simple_strtoul(options, &options, 0);
	if (*options && *options != ',') {
		printk("EXT3-fs: Invalid sb specification: %s\n",
		       (char *) *data);
		return 1;
	}
	if (*options == ',')
		options++;
	*data = (void *) options;
	return sb_block;
}

835
static int parse_options (char *options, struct super_block *sb,
836
			  unsigned int *inum, unsigned long *journal_devnum,
837
			  ext3_fsblk_t *n_blocks_count, int is_remount)
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{
	struct ext3_sb_info *sbi = EXT3_SB(sb);
	char * p;
	substring_t args[MAX_OPT_ARGS];
	int data_opt = 0;
	int option;
#ifdef CONFIG_QUOTA
	int qtype;
	char *qname;
#endif

	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:
			clear_opt (sbi->s_mount_opt, ERRORS_CONT);
			clear_opt (sbi->s_mount_opt, ERRORS_RO);
			set_opt (sbi->s_mount_opt, ERRORS_PANIC);
			break;
		case Opt_err_ro:
			clear_opt (sbi->s_mount_opt, ERRORS_CONT);
			clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
			set_opt (sbi->s_mount_opt, ERRORS_RO);
			break;
		case Opt_err_cont:
			clear_opt (sbi->s_mount_opt, ERRORS_RO);
			clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
			set_opt (sbi->s_mount_opt, ERRORS_CONT);
			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;
#ifdef CONFIG_EXT3_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("EXT3 (no)user_xattr options not supported\n");
			break;
#endif
#ifdef CONFIG_EXT3_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("EXT3 (no)acl options not supported\n");
			break;
#endif
		case Opt_reservation:
			set_opt(sbi->s_mount_opt, RESERVATION);
			break;
		case Opt_noreservation:
			clear_opt(sbi->s_mount_opt, RESERVATION);
			break;
		case Opt_journal_update:
			/* @@@ FIXME */
			/* Eventually we will want to be able to create
			   a journal file here.  For now, only allow the
			   user to specify an existing inode to be the
			   journal file. */
			if (is_remount) {
				printk(KERN_ERR "EXT3-fs: cannot specify "
				       "journal on remount\n");
				return 0;
			}
			set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
			break;
		case Opt_journal_inum:
			if (is_remount) {
				printk(KERN_ERR "EXT3-fs: cannot specify "
				       "journal on remount\n");
				return 0;
			}
			if (match_int(&args[0], &option))
				return 0;
			*inum = option;
			break;
970 971 972 973 974 975 976 977 978 979
		case Opt_journal_dev:
			if (is_remount) {
				printk(KERN_ERR "EXT3-fs: cannot specify "
				       "journal on remount\n");
				return 0;
			}
			if (match_int(&args[0], &option))
				return 0;
			*journal_devnum = option;
			break;
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		case Opt_noload:
			set_opt (sbi->s_mount_opt, NOLOAD);
			break;
		case Opt_commit:
			if (match_int(&args[0], &option))
				return 0;
			if (option < 0)
				return 0;
			if (option == 0)
				option = JBD_DEFAULT_MAX_COMMIT_AGE;
			sbi->s_commit_interval = HZ * option;
			break;
		case Opt_data_journal:
			data_opt = EXT3_MOUNT_JOURNAL_DATA;
			goto datacheck;
		case Opt_data_ordered:
			data_opt = EXT3_MOUNT_ORDERED_DATA;
			goto datacheck;
		case Opt_data_writeback:
			data_opt = EXT3_MOUNT_WRITEBACK_DATA;
		datacheck:
			if (is_remount) {
				if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
						!= data_opt) {
					printk(KERN_ERR
						"EXT3-fs: cannot change data "
						"mode on remount\n");
					return 0;
				}
			} else {
				sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
				sbi->s_mount_opt |= data_opt;
			}
			break;
#ifdef CONFIG_QUOTA
		case Opt_usrjquota:
			qtype = USRQUOTA;
			goto set_qf_name;
		case Opt_grpjquota:
			qtype = GRPQUOTA;
set_qf_name:
			if (sb_any_quota_enabled(sb)) {
				printk(KERN_ERR
					"EXT3-fs: Cannot change journalled "
					"quota options when quota turned on.\n");
				return 0;
			}
			qname = match_strdup(&args[0]);
			if (!qname) {
				printk(KERN_ERR
					"EXT3-fs: not enough memory for "
					"storing quotafile name.\n");
				return 0;
			}
			if (sbi->s_qf_names[qtype] &&
			    strcmp(sbi->s_qf_names[qtype], qname)) {
				printk(KERN_ERR
					"EXT3-fs: %s quota file already "
					"specified.\n", QTYPE2NAME(qtype));
				kfree(qname);
				return 0;
			}
			sbi->s_qf_names[qtype] = qname;
			if (strchr(sbi->s_qf_names[qtype], '/')) {
				printk(KERN_ERR
					"EXT3-fs: quotafile must be on "
					"filesystem root.\n");
				kfree(sbi->s_qf_names[qtype]);
				sbi->s_qf_names[qtype] = NULL;
				return 0;
			}
1051
			set_opt(sbi->s_mount_opt, QUOTA);
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			break;
		case Opt_offusrjquota:
			qtype = USRQUOTA;
			goto clear_qf_name;
		case Opt_offgrpjquota:
			qtype = GRPQUOTA;
clear_qf_name:
			if (sb_any_quota_enabled(sb)) {
				printk(KERN_ERR "EXT3-fs: Cannot change "
					"journalled quota options when "
					"quota turned on.\n");
				return 0;
			}
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			/*
			 * The space will be released later when all options
			 * are confirmed to be correct
			 */
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			sbi->s_qf_names[qtype] = NULL;
			break;
		case Opt_jqfmt_vfsold:
			sbi->s_jquota_fmt = QFMT_VFS_OLD;
			break;
		case Opt_jqfmt_vfsv0:
			sbi->s_jquota_fmt = QFMT_VFS_V0;
			break;
1077
		case Opt_quota:
1078 1079 1080 1081 1082
		case Opt_usrquota:
			set_opt(sbi->s_mount_opt, QUOTA);
			set_opt(sbi->s_mount_opt, USRQUOTA);
			break;
		case Opt_grpquota:
1083
			set_opt(sbi->s_mount_opt, QUOTA);
1084
			set_opt(sbi->s_mount_opt, GRPQUOTA);
1085 1086 1087 1088 1089 1090 1091 1092
			break;
		case Opt_noquota:
			if (sb_any_quota_enabled(sb)) {
				printk(KERN_ERR "EXT3-fs: Cannot change quota "
					"options when quota turned on.\n");
				return 0;
			}
			clear_opt(sbi->s_mount_opt, QUOTA);
1093 1094
			clear_opt(sbi->s_mount_opt, USRQUOTA);
			clear_opt(sbi->s_mount_opt, GRPQUOTA);
1095
			break;
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#else
1097 1098 1099
		case Opt_quota:
		case Opt_usrquota:
		case Opt_grpquota:
1100 1101 1102
			printk(KERN_ERR
				"EXT3-fs: quota options not supported.\n");
			break;
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		case Opt_usrjquota:
		case Opt_grpjquota:
		case Opt_offusrjquota:
		case Opt_offgrpjquota:
		case Opt_jqfmt_vfsold:
		case Opt_jqfmt_vfsv0:
			printk(KERN_ERR
1110
				"EXT3-fs: journaled quota options not "
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				"supported.\n");
			break;
1113 1114
		case Opt_noquota:
			break;
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#endif
		case Opt_abort:
			set_opt(sbi->s_mount_opt, ABORT);
			break;
		case Opt_barrier:
			if (match_int(&args[0], &option))
				return 0;
			if (option)
				set_opt(sbi->s_mount_opt, BARRIER);
			else
				clear_opt(sbi->s_mount_opt, BARRIER);
			break;
		case Opt_ignore:
			break;
		case Opt_resize:
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			if (!is_remount) {
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				printk("EXT3-fs: resize option only available "
					"for remount\n");
				return 0;
			}
1135 1136
			if (match_int(&args[0], &option) != 0)
				return 0;
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			*n_blocks_count = option;
			break;
		case Opt_nobh:
			set_opt(sbi->s_mount_opt, NOBH);
			break;
1142 1143 1144
		case Opt_bh:
			clear_opt(sbi->s_mount_opt, NOBH);
			break;
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		default:
			printk (KERN_ERR
				"EXT3-fs: Unrecognized mount option \"%s\" "
				"or missing value\n", p);
			return 0;
		}
	}
#ifdef CONFIG_QUOTA
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182
	if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
		if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
		     sbi->s_qf_names[USRQUOTA])
			clear_opt(sbi->s_mount_opt, USRQUOTA);

		if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
		     sbi->s_qf_names[GRPQUOTA])
			clear_opt(sbi->s_mount_opt, GRPQUOTA);

		if ((sbi->s_qf_names[USRQUOTA] &&
				(sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
		    (sbi->s_qf_names[GRPQUOTA] &&
				(sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
			printk(KERN_ERR "EXT3-fs: old and new quota "
					"format mixing.\n");
			return 0;
		}

		if (!sbi->s_jquota_fmt) {
			printk(KERN_ERR "EXT3-fs: journalled quota format "
					"not specified.\n");
			return 0;
		}
	} else {
		if (sbi->s_jquota_fmt) {
			printk(KERN_ERR "EXT3-fs: journalled quota format "
					"specified with no journalling "
					"enabled.\n");
			return 0;
		}
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	}
#endif
	return 1;
}

static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
			    int read_only)
{
	struct ext3_sb_info *sbi = EXT3_SB(sb);
	int res = 0;

	if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
		printk (KERN_ERR "EXT3-fs warning: revision level too high, "
			"forcing read-only mode\n");
		res = MS_RDONLY;
	}
	if (read_only)
		return res;
	if (!(sbi->s_mount_state & EXT3_VALID_FS))
		printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
			"running e2fsck is recommended\n");
	else if ((sbi->s_mount_state & EXT3_ERROR_FS))
		printk (KERN_WARNING
			"EXT3-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 (KERN_WARNING
			"EXT3-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 (KERN_WARNING
			"EXT3-fs warning: checktime reached, "
			"running e2fsck is recommended\n");
#if 0
		/* @@@ We _will_ want to clear the valid bit if we find
                   inconsistencies, to force a fsck at reboot.  But for
                   a plain journaled filesystem we can keep it set as
                   valid forever! :) */
1225
	es->s_state &= cpu_to_le16(~EXT3_VALID_FS);
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#endif
	if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
		es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1229
	le16_add_cpu(&es->s_mnt_count, 1);
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	es->s_mtime = cpu_to_le32(get_seconds());
	ext3_update_dynamic_rev(sb);
	EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);

	ext3_commit_super(sb, es, 1);
	if (test_opt(sb, DEBUG))
		printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
				"bpg=%lu, ipg=%lu, mo=%04lx]\n",
			sb->s_blocksize,
			sbi->s_groups_count,
			EXT3_BLOCKS_PER_GROUP(sb),
			EXT3_INODES_PER_GROUP(sb),
			sbi->s_mount_opt);

	printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
	if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
		char b[BDEVNAME_SIZE];

		printk("external journal on %s\n",
			bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
	} else {
		printk("internal journal\n");
	}
	return res;
}

/* Called at mount-time, super-block is locked */
1257
static int ext3_check_descriptors(struct super_block *sb)
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{
	struct ext3_sb_info *sbi = EXT3_SB(sb);
	int i;

	ext3_debug ("Checking group descriptors");

1264 1265
	for (i = 0; i < sbi->s_groups_count; i++) {
		struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1266 1267
		ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
		ext3_fsblk_t last_block;
1268

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		if (i == sbi->s_groups_count - 1)
			last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1;
		else
			last_block = first_block +
				(EXT3_BLOCKS_PER_GROUP(sb) - 1);

		if (le32_to_cpu(gdp->bg_block_bitmap) < first_block ||
		    le32_to_cpu(gdp->bg_block_bitmap) > last_block)
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		{
			ext3_error (sb, "ext3_check_descriptors",
				    "Block bitmap for group %d"
				    " not in group (block %lu)!",
				    i, (unsigned long)
					le32_to_cpu(gdp->bg_block_bitmap));
			return 0;
		}
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		if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block ||
		    le32_to_cpu(gdp->bg_inode_bitmap) > last_block)
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		{
			ext3_error (sb, "ext3_check_descriptors",
				    "Inode bitmap for group %d"
				    " not in group (block %lu)!",
				    i, (unsigned long)
					le32_to_cpu(gdp->bg_inode_bitmap));
			return 0;
		}
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		if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1296
		    le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 >
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		    last_block)
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		{
			ext3_error (sb, "ext3_check_descriptors",
				    "Inode table for group %d"
				    " not in group (block %lu)!",
				    i, (unsigned long)
					le32_to_cpu(gdp->bg_inode_table));
			return 0;
		}
	}

	sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
	sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
	return 1;
}


/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
 * the superblock) which were deleted from all directories, but held open by
 * a process at the time of a crash.  We walk the list and try to delete these
 * inodes at recovery time (only with a read-write filesystem).
 *
 * In order to keep the orphan inode chain consistent during traversal (in
 * case of crash during recovery), we link each inode into the superblock
 * orphan list_head and handle it the same way as an inode deletion during
 * normal operation (which journals the operations for us).
 *
 * We only do an iget() and an iput() on each inode, which is very safe if we
 * accidentally point at an in-use or already deleted inode.  The worst that
 * can happen in this case is that we get a "bit already cleared" message from
 * ext3_free_inode().  The only reason we would point at a wrong inode is if
 * e2fsck was run on this filesystem, and it must have already done the orphan
 * inode cleanup for us, so we can safely abort without any further action.
 */
static void ext3_orphan_cleanup (struct super_block * sb,
				 struct ext3_super_block * es)
{
	unsigned int s_flags = sb->s_flags;
	int nr_orphans = 0, nr_truncates = 0;
#ifdef CONFIG_QUOTA
	int i;
#endif
	if (!es->s_last_orphan) {
		jbd_debug(4, "no orphan inodes to clean up\n");
		return;
	}

1344 1345 1346 1347 1348 1349
	if (bdev_read_only(sb->s_bdev)) {
		printk(KERN_ERR "EXT3-fs: write access "
			"unavailable, skipping orphan cleanup.\n");
		return;
	}

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	if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
		if (es->s_last_orphan)
			jbd_debug(1, "Errors on filesystem, "
				  "clearing orphan list.\n");
		es->s_last_orphan = 0;
		jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
		return;
	}

	if (s_flags & MS_RDONLY) {
		printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
		       sb->s_id);
		sb->s_flags &= ~MS_RDONLY;
	}
#ifdef CONFIG_QUOTA
	/* Needed for iput() to work correctly and not trash data */
	sb->s_flags |= MS_ACTIVE;
	/* Turn on quotas so that they are updated correctly */
	for (i = 0; i < MAXQUOTAS; i++) {
		if (EXT3_SB(sb)->s_qf_names[i]) {
			int ret = ext3_quota_on_mount(sb, i);
			if (ret < 0)
				printk(KERN_ERR
					"EXT3-fs: Cannot turn on journalled "
					"quota: error %d\n", ret);
		}
	}
#endif

	while (es->s_last_orphan) {
		struct inode *inode;

1382 1383
		inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
		if (IS_ERR(inode)) {
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			es->s_last_orphan = 0;
			break;
		}

		list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
		DQUOT_INIT(inode);
		if (inode->i_nlink) {
			printk(KERN_DEBUG
1392
				"%s: truncating inode %lu to %Ld bytes\n",
1393
				__func__, inode->i_ino, inode->i_size);
1394
			jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
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				  inode->i_ino, inode->i_size);
			ext3_truncate(inode);
			nr_truncates++;
		} else {
			printk(KERN_DEBUG
1400
				"%s: deleting unreferenced inode %lu\n",
1401
				__func__, inode->i_ino);
1402
			jbd_debug(2, "deleting unreferenced inode %lu\n",
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				  inode->i_ino);
			nr_orphans++;
		}
		iput(inode);  /* The delete magic happens here! */
	}

#define PLURAL(x) (x), ((x)==1) ? "" : "s"

	if (nr_orphans)
		printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
		       sb->s_id, PLURAL(nr_orphans));
	if (nr_truncates)
		printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
		       sb->s_id, PLURAL(nr_truncates));
#ifdef CONFIG_QUOTA
	/* Turn quotas off */
	for (i = 0; i < MAXQUOTAS; i++) {
		if (sb_dqopt(sb)->files[i])
1421
			vfs_quota_off(sb, i, 0);
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	}
#endif
	sb->s_flags = s_flags; /* Restore MS_RDONLY status */
}

/*
 * 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 ext3_max_size(int bits)
{
	loff_t res = EXT3_NDIR_BLOCKS;
1435 1436 1437 1438 1439
	int meta_blocks;
	loff_t upper_limit;

	/* This is calculated to be the largest file size for a
	 * dense, file such that the total number of
L
Linus Torvalds 已提交
1440
	 * sectors in the file, including data and all indirect blocks,
1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459
	 * does not exceed 2^32 -1
	 * __u32 i_blocks representing the total number of
	 * 512 bytes blocks of the file
	 */
	upper_limit = (1LL << 32) - 1;

	/* total blocks in file system block size */
	upper_limit >>= (bits - 9);


	/* indirect blocks */
	meta_blocks = 1;
	/* double indirect blocks */
	meta_blocks += 1 + (1LL << (bits-2));
	/* tripple indirect blocks */
	meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));

	upper_limit -= meta_blocks;
	upper_limit <<= bits;
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	res += 1LL << (bits-2);
	res += 1LL << (2*(bits-2));
	res += 1LL << (3*(bits-2));
	res <<= bits;
	if (res > upper_limit)
		res = upper_limit;
1467 1468 1469 1470

	if (res > MAX_LFS_FILESIZE)
		res = MAX_LFS_FILESIZE;

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	return res;
}

1474 1475
static ext3_fsblk_t descriptor_loc(struct super_block *sb,
				    ext3_fsblk_t logic_sb_block,
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				    int nr)
{
	struct ext3_sb_info *sbi = EXT3_SB(sb);
1479
	unsigned long bg, first_meta_bg;
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	int has_super = 0;

	first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);

	if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
	    nr < first_meta_bg)
		return (logic_sb_block + nr + 1);
	bg = sbi->s_desc_per_block * nr;
	if (ext3_bg_has_super(sb, bg))
		has_super = 1;
1490
	return (has_super + ext3_group_first_block_no(sb, bg));
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}


static int ext3_fill_super (struct super_block *sb, void *data, int silent)
{
	struct buffer_head * bh;
	struct ext3_super_block *es = NULL;
	struct ext3_sb_info *sbi;
1499 1500 1501
	ext3_fsblk_t block;
	ext3_fsblk_t sb_block = get_sb_block(&data);
	ext3_fsblk_t logic_sb_block;
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	unsigned long offset = 0;
1503
	unsigned int journal_inum = 0;
1504
	unsigned long journal_devnum = 0;
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	unsigned long def_mount_opts;
	struct inode *root;
	int blocksize;
	int hblock;
	int db_count;
	int i;
	int needs_recovery;
1512
	int ret = -EINVAL;
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	__le32 features;
1514
	int err;
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1516
	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
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	if (!sbi)
		return -ENOMEM;
	sb->s_fs_info = sbi;
	sbi->s_mount_opt = 0;
	sbi->s_resuid = EXT3_DEF_RESUID;
	sbi->s_resgid = EXT3_DEF_RESGID;
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	sbi->s_sb_block = sb_block;
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	unlock_kernel();

	blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
	if (!blocksize) {
		printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
		goto out_fail;
	}

	/*
	 * The ext3 superblock will not be buffer aligned for other than 1kB
	 * block sizes.  We need to calculate the offset from buffer start.
	 */
	if (blocksize != EXT3_MIN_BLOCK_SIZE) {
		logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
		offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
	} else {
		logic_sb_block = sb_block;
	}

	if (!(bh = sb_bread(sb, logic_sb_block))) {
		printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
		goto out_fail;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
	 *       some ext3 macro-instructions depend on its value
	 */
	es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);
	if (sb->s_magic != EXT3_SUPER_MAGIC)
		goto cantfind_ext3;

	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
	if (def_mount_opts & EXT3_DEFM_DEBUG)
		set_opt(sbi->s_mount_opt, DEBUG);
	if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
		set_opt(sbi->s_mount_opt, GRPID);
	if (def_mount_opts & EXT3_DEFM_UID16)
		set_opt(sbi->s_mount_opt, NO_UID32);
1566
#ifdef CONFIG_EXT3_FS_XATTR
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	if (def_mount_opts & EXT3_DEFM_XATTR_USER)
		set_opt(sbi->s_mount_opt, XATTR_USER);
1569 1570
#endif
#ifdef CONFIG_EXT3_FS_POSIX_ACL
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	if (def_mount_opts & EXT3_DEFM_ACL)
		set_opt(sbi->s_mount_opt, POSIX_ACL);
1573
#endif
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	if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
		sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
	else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
		sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
	else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
		sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;

	if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
		set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1583
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
D
Dmitry Mishin 已提交
1584
		set_opt(sbi->s_mount_opt, ERRORS_CONT);
1585 1586
	else
		set_opt(sbi->s_mount_opt, ERRORS_RO);
L
Linus Torvalds 已提交
1587 1588 1589 1590 1591 1592

	sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
	sbi->s_resgid = le16_to_cpu(es->s_def_resgid);

	set_opt(sbi->s_mount_opt, RESERVATION);

1593 1594
	if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
			    NULL, 0))
L
Linus Torvalds 已提交
1595 1596 1597 1598 1599 1600 1601 1602 1603
		goto failed_mount;

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
		((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);

	if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
	    (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
	     EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
	     EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1604
		printk(KERN_WARNING
L
Linus Torvalds 已提交
1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629
		       "EXT3-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 = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
	if (features) {
		printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
		       "unsupported optional features (%x).\n",
		       sb->s_id, le32_to_cpu(features));
		goto failed_mount;
	}
	features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
	if (!(sb->s_flags & MS_RDONLY) && features) {
		printk(KERN_ERR "EXT3-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(es->s_log_block_size);

	if (blocksize < EXT3_MIN_BLOCK_SIZE ||
	    blocksize > EXT3_MAX_BLOCK_SIZE) {
1630
		printk(KERN_ERR
L
Linus Torvalds 已提交
1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648
		       "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
		       blocksize, sb->s_id);
		goto failed_mount;
	}

	hblock = bdev_hardsect_size(sb->s_bdev);
	if (sb->s_blocksize != blocksize) {
		/*
		 * Make sure the blocksize for the filesystem is larger
		 * than the hardware sectorsize for the machine.
		 */
		if (blocksize < hblock) {
			printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
			       "device blocksize %d.\n", blocksize, hblock);
			goto failed_mount;
		}

		brelse (bh);
1649 1650 1651 1652 1653
		if (!sb_set_blocksize(sb, blocksize)) {
			printk(KERN_ERR "EXT3-fs: bad blocksize %d.\n",
				blocksize);
			goto out_fail;
		}
L
Linus Torvalds 已提交
1654 1655 1656 1657
		logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
		offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
		bh = sb_bread(sb, logic_sb_block);
		if (!bh) {
1658
			printk(KERN_ERR
L
Linus Torvalds 已提交
1659 1660 1661 1662 1663 1664
			       "EXT3-fs: Can't read superblock on 2nd try.\n");
			goto failed_mount;
		}
		es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
		sbi->s_es = es;
		if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1665
			printk (KERN_ERR
L
Linus Torvalds 已提交
1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679
				"EXT3-fs: Magic mismatch, very weird !\n");
			goto failed_mount;
		}
	}

	sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);

	if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
		sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
		sbi->s_first_ino = EXT3_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 < EXT3_GOOD_OLD_INODE_SIZE) ||
V
vignesh babu 已提交
1680
		    (!is_power_of_2(sbi->s_inode_size)) ||
L
Linus Torvalds 已提交
1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699
		    (sbi->s_inode_size > blocksize)) {
			printk (KERN_ERR
				"EXT3-fs: unsupported inode size: %d\n",
				sbi->s_inode_size);
			goto failed_mount;
		}
	}
	sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
				   le32_to_cpu(es->s_log_frag_size);
	if (blocksize != sbi->s_frag_size) {
		printk(KERN_ERR
		       "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
		       sbi->s_frag_size, blocksize);
		goto failed_mount;
	}
	sbi->s_frags_per_block = 1;
	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);
1700
	if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
L
Linus Torvalds 已提交
1701 1702 1703 1704 1705 1706 1707 1708 1709
		goto cantfind_ext3;
	sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
	if (sbi->s_inodes_per_block == 0)
		goto cantfind_ext3;
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
	sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
1710 1711
	sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb));
L
Linus Torvalds 已提交
1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734
	for (i=0; i < 4; i++)
		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
	sbi->s_def_hash_version = es->s_def_hash_version;

	if (sbi->s_blocks_per_group > blocksize * 8) {
		printk (KERN_ERR
			"EXT3-fs: #blocks per group too big: %lu\n",
			sbi->s_blocks_per_group);
		goto failed_mount;
	}
	if (sbi->s_frags_per_group > blocksize * 8) {
		printk (KERN_ERR
			"EXT3-fs: #fragments per group too big: %lu\n",
			sbi->s_frags_per_group);
		goto failed_mount;
	}
	if (sbi->s_inodes_per_group > blocksize * 8) {
		printk (KERN_ERR
			"EXT3-fs: #inodes per group too big: %lu\n",
			sbi->s_inodes_per_group);
		goto failed_mount;
	}

1735 1736 1737 1738 1739 1740 1741 1742 1743 1744
	if (le32_to_cpu(es->s_blocks_count) >
		    (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
		printk(KERN_ERR "EXT3-fs: filesystem on %s:"
			" too large to mount safely\n", sb->s_id);
		if (sizeof(sector_t) < 8)
			printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
					"enabled\n");
		goto failed_mount;
	}

L
Linus Torvalds 已提交
1745 1746
	if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext3;
E
Eric Sandeen 已提交
1747 1748 1749
	sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
			       le32_to_cpu(es->s_first_data_block) - 1)
				       / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
L
Linus Torvalds 已提交
1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771
	db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
		   EXT3_DESC_PER_BLOCK(sb);
	sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
				    GFP_KERNEL);
	if (sbi->s_group_desc == NULL) {
		printk (KERN_ERR "EXT3-fs: not enough memory\n");
		goto failed_mount;
	}

	bgl_lock_init(&sbi->s_blockgroup_lock);

	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]) {
			printk (KERN_ERR "EXT3-fs: "
				"can't read group descriptor %d\n", i);
			db_count = i;
			goto failed_mount2;
		}
	}
	if (!ext3_check_descriptors (sb)) {
1772
		printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
L
Linus Torvalds 已提交
1773 1774 1775 1776 1777
		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);
1778

1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792
	err = percpu_counter_init(&sbi->s_freeblocks_counter,
			ext3_count_free_blocks(sb));
	if (!err) {
		err = percpu_counter_init(&sbi->s_freeinodes_counter,
				ext3_count_free_inodes(sb));
	}
	if (!err) {
		err = percpu_counter_init(&sbi->s_dirs_counter,
				ext3_count_dirs(sb));
	}
	if (err) {
		printk(KERN_ERR "EXT3-fs: insufficient memory\n");
		goto failed_mount3;
	}
1793

L
Linus Torvalds 已提交
1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830
	/* per fileystem reservation list head & lock */
	spin_lock_init(&sbi->s_rsv_window_lock);
	sbi->s_rsv_window_root = RB_ROOT;
	/* Add a single, static dummy reservation to the start of the
	 * reservation window list --- it gives us a placeholder for
	 * append-at-start-of-list which makes the allocation logic
	 * _much_ simpler. */
	sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
	sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
	sbi->s_rsv_window_head.rsv_alloc_hit = 0;
	sbi->s_rsv_window_head.rsv_goal_size = 0;
	ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);

	/*
	 * set up enough so that it can read an inode
	 */
	sb->s_op = &ext3_sops;
	sb->s_export_op = &ext3_export_ops;
	sb->s_xattr = ext3_xattr_handlers;
#ifdef CONFIG_QUOTA
	sb->s_qcop = &ext3_qctl_operations;
	sb->dq_op = &ext3_quota_operations;
#endif
	INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */

	sb->s_root = NULL;

	needs_recovery = (es->s_last_orphan != 0 ||
			  EXT3_HAS_INCOMPAT_FEATURE(sb,
				    EXT3_FEATURE_INCOMPAT_RECOVER));

	/*
	 * The first inode we look at is the journal inode.  Don't try
	 * root first: it may be modified in the journal!
	 */
	if (!test_opt(sb, NOLOAD) &&
	    EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1831
		if (ext3_load_journal(sb, es, journal_devnum))
1832
			goto failed_mount3;
L
Linus Torvalds 已提交
1833 1834
	} else if (journal_inum) {
		if (ext3_create_journal(sb, es, journal_inum))
1835
			goto failed_mount3;
L
Linus Torvalds 已提交
1836 1837 1838 1839 1840
	} else {
		if (!silent)
			printk (KERN_ERR
				"ext3: No journal on filesystem on %s\n",
				sb->s_id);
1841
		goto failed_mount3;
L
Linus Torvalds 已提交
1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863
	}

	/* We have now updated the journal if required, so we can
	 * validate the data journaling mode. */
	switch (test_opt(sb, DATA_FLAGS)) {
	case 0:
		/* No mode set, assume a default based on the journal
                   capabilities: ORDERED_DATA if the journal can
                   cope, else JOURNAL_DATA */
		if (journal_check_available_features
		    (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
			set_opt(sbi->s_mount_opt, ORDERED_DATA);
		else
			set_opt(sbi->s_mount_opt, JOURNAL_DATA);
		break;

	case EXT3_MOUNT_ORDERED_DATA:
	case EXT3_MOUNT_WRITEBACK_DATA:
		if (!journal_check_available_features
		    (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
			printk(KERN_ERR "EXT3-fs: Journal does not support "
			       "requested data journaling mode\n");
1864
			goto failed_mount4;
L
Linus Torvalds 已提交
1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881
		}
	default:
		break;
	}

	if (test_opt(sb, NOBH)) {
		if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
			printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
				"its supported only with writeback mode\n");
			clear_opt(sbi->s_mount_opt, NOBH);
		}
	}
	/*
	 * The journal_load will have done any necessary log recovery,
	 * so we can safely mount the rest of the filesystem now.
	 */

1882 1883
	root = ext3_iget(sb, EXT3_ROOT_INO);
	if (IS_ERR(root)) {
L
Linus Torvalds 已提交
1884
		printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1885
		ret = PTR_ERR(root);
1886
		goto failed_mount4;
L
Linus Torvalds 已提交
1887 1888
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1889
		iput(root);
L
Linus Torvalds 已提交
1890
		printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1891
		goto failed_mount4;
L
Linus Torvalds 已提交
1892
	}
1893 1894 1895 1896 1897 1898 1899
	sb->s_root = d_alloc_root(root);
	if (!sb->s_root) {
		printk(KERN_ERR "EXT3-fs: get root dentry failed\n");
		iput(root);
		ret = -ENOMEM;
		goto failed_mount4;
	}
L
Linus Torvalds 已提交
1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929

	ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
	/*
	 * akpm: core read_super() calls in here with the superblock locked.
	 * That deadlocks, because orphan cleanup needs to lock the superblock
	 * in numerous places.  Here we just pop the lock - it's relatively
	 * harmless, because we are now ready to accept write_super() requests,
	 * and aviro says that's the only reason for hanging onto the
	 * superblock lock.
	 */
	EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
	ext3_orphan_cleanup(sb, es);
	EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
	if (needs_recovery)
		printk (KERN_INFO "EXT3-fs: recovery complete.\n");
	ext3_mark_recovery_complete(sb, es);
	printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
		test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
		test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
		"writeback");

	lock_kernel();
	return 0;

cantfind_ext3:
	if (!silent)
		printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
		       sb->s_id);
	goto failed_mount;

1930
failed_mount4:
L
Linus Torvalds 已提交
1931
	journal_destroy(sbi->s_journal);
1932 1933 1934 1935
failed_mount3:
	percpu_counter_destroy(&sbi->s_freeblocks_counter);
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
L
Linus Torvalds 已提交
1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
	kfree(sbi->s_group_desc);
failed_mount:
#ifdef CONFIG_QUOTA
	for (i = 0; i < MAXQUOTAS; i++)
		kfree(sbi->s_qf_names[i]);
#endif
	ext3_blkdev_remove(sbi);
	brelse(bh);
out_fail:
	sb->s_fs_info = NULL;
	kfree(sbi);
	lock_kernel();
1951
	return ret;
L
Linus Torvalds 已提交
1952 1953 1954 1955 1956
}

/*
 * Setup any per-fs journal parameters now.  We'll do this both on
 * initial mount, once the journal has been initialised but before we've
1957
 * done any recovery; and again on any subsequent remount.
L
Linus Torvalds 已提交
1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976
 */
static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
{
	struct ext3_sb_info *sbi = EXT3_SB(sb);

	if (sbi->s_commit_interval)
		journal->j_commit_interval = sbi->s_commit_interval;
	/* We could also set up an ext3-specific default for the commit
	 * interval here, but for now we'll just fall back to the jbd
	 * default. */

	spin_lock(&journal->j_state_lock);
	if (test_opt(sb, BARRIER))
		journal->j_flags |= JFS_BARRIER;
	else
		journal->j_flags &= ~JFS_BARRIER;
	spin_unlock(&journal->j_state_lock);
}

1977 1978
static journal_t *ext3_get_journal(struct super_block *sb,
				   unsigned int journal_inum)
L
Linus Torvalds 已提交
1979 1980 1981 1982 1983 1984 1985 1986
{
	struct inode *journal_inode;
	journal_t *journal;

	/* First, test for the existence of a valid inode on disk.  Bad
	 * things happen if we iget() an unused inode, as the subsequent
	 * iput() will try to delete it. */

1987 1988
	journal_inode = ext3_iget(sb, journal_inum);
	if (IS_ERR(journal_inode)) {
L
Linus Torvalds 已提交
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000
		printk(KERN_ERR "EXT3-fs: no journal found.\n");
		return NULL;
	}
	if (!journal_inode->i_nlink) {
		make_bad_inode(journal_inode);
		iput(journal_inode);
		printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
		return NULL;
	}

	jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
		  journal_inode, journal_inode->i_size);
2001
	if (!S_ISREG(journal_inode->i_mode)) {
L
Linus Torvalds 已提交
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
		printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
		iput(journal_inode);
		return NULL;
	}

	journal = journal_init_inode(journal_inode);
	if (!journal) {
		printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
		iput(journal_inode);
		return NULL;
	}
	journal->j_private = sb;
	ext3_init_journal_params(sb, journal);
	return journal;
}

static journal_t *ext3_get_dev_journal(struct super_block *sb,
				       dev_t j_dev)
{
	struct buffer_head * bh;
	journal_t *journal;
2023
	ext3_fsblk_t start;
2024
	ext3_fsblk_t len;
L
Linus Torvalds 已提交
2025
	int hblock, blocksize;
2026
	ext3_fsblk_t sb_block;
L
Linus Torvalds 已提交
2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107
	unsigned long offset;
	struct ext3_super_block * es;
	struct block_device *bdev;

	bdev = ext3_blkdev_get(j_dev);
	if (bdev == NULL)
		return NULL;

	if (bd_claim(bdev, sb)) {
		printk(KERN_ERR
		        "EXT3: failed to claim external journal device.\n");
		blkdev_put(bdev);
		return NULL;
	}

	blocksize = sb->s_blocksize;
	hblock = bdev_hardsect_size(bdev);
	if (blocksize < hblock) {
		printk(KERN_ERR
			"EXT3-fs: blocksize too small for journal device.\n");
		goto out_bdev;
	}

	sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
	offset = EXT3_MIN_BLOCK_SIZE % blocksize;
	set_blocksize(bdev, blocksize);
	if (!(bh = __bread(bdev, sb_block, blocksize))) {
		printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
		       "external journal\n");
		goto out_bdev;
	}

	es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
	if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
	    !(le32_to_cpu(es->s_feature_incompat) &
	      EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
		printk(KERN_ERR "EXT3-fs: external journal has "
					"bad superblock\n");
		brelse(bh);
		goto out_bdev;
	}

	if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
		printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
		brelse(bh);
		goto out_bdev;
	}

	len = le32_to_cpu(es->s_blocks_count);
	start = sb_block + 1;
	brelse(bh);	/* we're done with the superblock */

	journal = journal_init_dev(bdev, sb->s_bdev,
					start, len, blocksize);
	if (!journal) {
		printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
		goto out_bdev;
	}
	journal->j_private = sb;
	ll_rw_block(READ, 1, &journal->j_sb_buffer);
	wait_on_buffer(journal->j_sb_buffer);
	if (!buffer_uptodate(journal->j_sb_buffer)) {
		printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
		goto out_journal;
	}
	if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
		printk(KERN_ERR "EXT3-fs: External journal has more than one "
					"user (unsupported) - %d\n",
			be32_to_cpu(journal->j_superblock->s_nr_users));
		goto out_journal;
	}
	EXT3_SB(sb)->journal_bdev = bdev;
	ext3_init_journal_params(sb, journal);
	return journal;
out_journal:
	journal_destroy(journal);
out_bdev:
	ext3_blkdev_put(bdev);
	return NULL;
}

2108 2109 2110
static int ext3_load_journal(struct super_block *sb,
			     struct ext3_super_block *es,
			     unsigned long journal_devnum)
L
Linus Torvalds 已提交
2111 2112
{
	journal_t *journal;
2113
	unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2114
	dev_t journal_dev;
L
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2115 2116 2117
	int err = 0;
	int really_read_only;

2118 2119 2120 2121 2122 2123 2124 2125
	if (journal_devnum &&
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
		printk(KERN_INFO "EXT3-fs: external journal device major/minor "
			"numbers have changed\n");
		journal_dev = new_decode_dev(journal_devnum);
	} else
		journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));

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2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183
	really_read_only = bdev_read_only(sb->s_bdev);

	/*
	 * Are we loading a blank journal or performing recovery after a
	 * crash?  For recovery, we need to check in advance whether we
	 * can get read-write access to the device.
	 */

	if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
		if (sb->s_flags & MS_RDONLY) {
			printk(KERN_INFO "EXT3-fs: INFO: recovery "
					"required on readonly filesystem.\n");
			if (really_read_only) {
				printk(KERN_ERR "EXT3-fs: write access "
					"unavailable, cannot proceed.\n");
				return -EROFS;
			}
			printk (KERN_INFO "EXT3-fs: write access will "
					"be enabled during recovery.\n");
		}
	}

	if (journal_inum && journal_dev) {
		printk(KERN_ERR "EXT3-fs: filesystem has both journal "
		       "and inode journals!\n");
		return -EINVAL;
	}

	if (journal_inum) {
		if (!(journal = ext3_get_journal(sb, journal_inum)))
			return -EINVAL;
	} else {
		if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
			return -EINVAL;
	}

	if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
		err = journal_update_format(journal);
		if (err)  {
			printk(KERN_ERR "EXT3-fs: error updating journal.\n");
			journal_destroy(journal);
			return err;
		}
	}

	if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
		err = journal_wipe(journal, !really_read_only);
	if (!err)
		err = journal_load(journal);

	if (err) {
		printk(KERN_ERR "EXT3-fs: error loading journal.\n");
		journal_destroy(journal);
		return err;
	}

	EXT3_SB(sb)->s_journal = journal;
	ext3_clear_journal_err(sb, es);
2184 2185 2186 2187 2188 2189 2190 2191 2192 2193

	if (journal_devnum &&
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
		es->s_journal_dev = cpu_to_le32(journal_devnum);
		sb->s_dirt = 1;

		/* Make sure we flush the recovery flag to disk. */
		ext3_commit_super(sb, es, 1);
	}

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	return 0;
}

static int ext3_create_journal(struct super_block * sb,
			       struct ext3_super_block * es,
2199
			       unsigned int journal_inum)
L
Linus Torvalds 已提交
2200 2201
{
	journal_t *journal;
2202
	int err;
L
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2203 2204 2205 2206 2207 2208 2209

	if (sb->s_flags & MS_RDONLY) {
		printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
				"create journal.\n");
		return -EROFS;
	}

2210 2211
	journal = ext3_get_journal(sb, journal_inum);
	if (!journal)
L
Linus Torvalds 已提交
2212 2213
		return -EINVAL;

2214
	printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
L
Linus Torvalds 已提交
2215 2216
	       journal_inum);

2217 2218
	err = journal_create(journal);
	if (err) {
L
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2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268
		printk(KERN_ERR "EXT3-fs: error creating journal.\n");
		journal_destroy(journal);
		return -EIO;
	}

	EXT3_SB(sb)->s_journal = journal;

	ext3_update_dynamic_rev(sb);
	EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
	EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);

	es->s_journal_inum = cpu_to_le32(journal_inum);
	sb->s_dirt = 1;

	/* Make sure we flush the recovery flag to disk. */
	ext3_commit_super(sb, es, 1);

	return 0;
}

static void ext3_commit_super (struct super_block * sb,
			       struct ext3_super_block * es,
			       int sync)
{
	struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;

	if (!sbh)
		return;
	es->s_wtime = cpu_to_le32(get_seconds());
	es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
	es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
	BUFFER_TRACE(sbh, "marking dirty");
	mark_buffer_dirty(sbh);
	if (sync)
		sync_dirty_buffer(sbh);
}


/*
 * Have we just finished recovery?  If so, and if we are mounting (or
 * remounting) the filesystem readonly, then we will end up with a
 * consistent fs on disk.  Record that fact.
 */
static void ext3_mark_recovery_complete(struct super_block * sb,
					struct ext3_super_block * es)
{
	journal_t *journal = EXT3_SB(sb)->s_journal;

	journal_lock_updates(journal);
	journal_flush(journal);
2269
	lock_super(sb);
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2270 2271 2272 2273 2274 2275
	if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
	    sb->s_flags & MS_RDONLY) {
		EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
		sb->s_dirt = 0;
		ext3_commit_super(sb, es, 1);
	}
2276
	unlock_super(sb);
L
Linus Torvalds 已提交
2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303
	journal_unlock_updates(journal);
}

/*
 * If we are mounting (or read-write remounting) a filesystem whose journal
 * has recorded an error from a previous lifetime, move that error to the
 * main filesystem now.
 */
static void ext3_clear_journal_err(struct super_block * sb,
				   struct ext3_super_block * es)
{
	journal_t *journal;
	int j_errno;
	const char *errstr;

	journal = EXT3_SB(sb)->s_journal;

	/*
	 * Now check for any error status which may have been recorded in the
	 * journal by a prior ext3_error() or ext3_abort()
	 */

	j_errno = journal_errno(journal);
	if (j_errno) {
		char nbuf[16];

		errstr = ext3_decode_error(sb, j_errno, nbuf);
2304
		ext3_warning(sb, __func__, "Filesystem error recorded "
L
Linus Torvalds 已提交
2305
			     "from previous mount: %s", errstr);
2306
		ext3_warning(sb, __func__, "Marking fs in need of "
L
Linus Torvalds 已提交
2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345
			     "filesystem check.");

		EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
		es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
		ext3_commit_super (sb, es, 1);

		journal_clear_err(journal);
	}
}

/*
 * Force the running and committing transactions to commit,
 * and wait on the commit.
 */
int ext3_force_commit(struct super_block *sb)
{
	journal_t *journal;
	int ret;

	if (sb->s_flags & MS_RDONLY)
		return 0;

	journal = EXT3_SB(sb)->s_journal;
	sb->s_dirt = 0;
	ret = ext3_journal_force_commit(journal);
	return ret;
}

/*
 * Ext3 always journals updates to the superblock itself, so we don't
 * have to propagate any other updates to the superblock on disk at this
 * point.  Just start an async writeback to get the buffers on their way
 * to the disk.
 *
 * This implicitly triggers the writebehind on sync().
 */

static void ext3_write_super (struct super_block * sb)
{
2346
	if (mutex_trylock(&sb->s_lock) != 0)
L
Linus Torvalds 已提交
2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403
		BUG();
	sb->s_dirt = 0;
}

static int ext3_sync_fs(struct super_block *sb, int wait)
{
	tid_t target;

	sb->s_dirt = 0;
	if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
		if (wait)
			log_wait_commit(EXT3_SB(sb)->s_journal, target);
	}
	return 0;
}

/*
 * LVM calls this function before a (read-only) snapshot is created.  This
 * gives us a chance to flush the journal completely and mark the fs clean.
 */
static void ext3_write_super_lockfs(struct super_block *sb)
{
	sb->s_dirt = 0;

	if (!(sb->s_flags & MS_RDONLY)) {
		journal_t *journal = EXT3_SB(sb)->s_journal;

		/* Now we set up the journal barrier. */
		journal_lock_updates(journal);
		journal_flush(journal);

		/* Journal blocked and flushed, clear needs_recovery flag. */
		EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
		ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
	}
}

/*
 * Called by LVM after the snapshot is done.  We need to reset the RECOVER
 * flag here, even though the filesystem is not technically dirty yet.
 */
static void ext3_unlockfs(struct super_block *sb)
{
	if (!(sb->s_flags & MS_RDONLY)) {
		lock_super(sb);
		/* Reser the needs_recovery flag before the fs is unlocked. */
		EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
		ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
		unlock_super(sb);
		journal_unlock_updates(EXT3_SB(sb)->s_journal);
	}
}

static int ext3_remount (struct super_block * sb, int * flags, char * data)
{
	struct ext3_super_block * es;
	struct ext3_sb_info *sbi = EXT3_SB(sb);
2404
	ext3_fsblk_t n_blocks_count = 0;
J
Jan Kara 已提交
2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422
	unsigned long old_sb_flags;
	struct ext3_mount_options old_opts;
	int err;
#ifdef CONFIG_QUOTA
	int i;
#endif

	/* Store the original 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;
	old_opts.s_commit_interval = sbi->s_commit_interval;
#ifdef CONFIG_QUOTA
	old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
	for (i = 0; i < MAXQUOTAS; i++)
		old_opts.s_qf_names[i] = sbi->s_qf_names[i];
#endif
L
Linus Torvalds 已提交
2423 2424 2425 2426

	/*
	 * Allow the "check" option to be passed as a remount option.
	 */
2427
	if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
J
Jan Kara 已提交
2428 2429 2430
		err = -EINVAL;
		goto restore_opts;
	}
L
Linus Torvalds 已提交
2431 2432

	if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2433
		ext3_abort(sb, __func__, "Abort forced by user");
L
Linus Torvalds 已提交
2434 2435 2436 2437 2438 2439 2440 2441 2442 2443

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
		((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);

	es = sbi->s_es;

	ext3_init_journal_params(sb, sbi->s_journal);

	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
		n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
J
Jan Kara 已提交
2444 2445 2446 2447
		if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
			err = -EROFS;
			goto restore_opts;
		}
L
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2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464

		if (*flags & MS_RDONLY) {
			/*
			 * First of all, the unconditional stuff we have to do
			 * to disable replay of the journal when we next remount
			 */
			sb->s_flags |= MS_RDONLY;

			/*
			 * OK, test if we are remounting a valid rw partition
			 * readonly, and if so set the rdonly flag and then
			 * mark the partition as valid again.
			 */
			if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
			    (sbi->s_mount_state & EXT3_VALID_FS))
				es->s_state = cpu_to_le16(sbi->s_mount_state);

2465 2466 2467 2468 2469
			/*
			 * We have to unlock super so that we can wait for
			 * transactions.
			 */
			unlock_super(sb);
L
Linus Torvalds 已提交
2470
			ext3_mark_recovery_complete(sb, es);
2471
			lock_super(sb);
L
Linus Torvalds 已提交
2472 2473 2474 2475 2476 2477 2478 2479
		} else {
			__le32 ret;
			if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
					~EXT3_FEATURE_RO_COMPAT_SUPP))) {
				printk(KERN_WARNING "EXT3-fs: %s: couldn't "
				       "remount RDWR because of unsupported "
				       "optional features (%x).\n",
				       sb->s_id, le32_to_cpu(ret));
J
Jan Kara 已提交
2480 2481
				err = -EROFS;
				goto restore_opts;
L
Linus Torvalds 已提交
2482
			}
2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498

			/*
			 * If we have an unprocessed orphan list hanging
			 * around from a previously readonly bdev mount,
			 * require a full umount/remount for now.
			 */
			if (es->s_last_orphan) {
				printk(KERN_WARNING "EXT3-fs: %s: couldn't "
				       "remount RDWR because of unprocessed "
				       "orphan inode list.  Please "
				       "umount/remount instead.\n",
				       sb->s_id);
				err = -EINVAL;
				goto restore_opts;
			}

L
Linus Torvalds 已提交
2499 2500 2501 2502 2503 2504 2505 2506
			/*
			 * 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.)
			 */
			ext3_clear_journal_err(sb, es);
			sbi->s_mount_state = le16_to_cpu(es->s_state);
2507
			if ((err = ext3_group_extend(sb, es, n_blocks_count)))
J
Jan Kara 已提交
2508
				goto restore_opts;
L
Linus Torvalds 已提交
2509 2510 2511 2512
			if (!ext3_setup_super (sb, es, 0))
				sb->s_flags &= ~MS_RDONLY;
		}
	}
J
Jan Kara 已提交
2513 2514 2515 2516 2517 2518 2519
#ifdef CONFIG_QUOTA
	/* Release old quota file names */
	for (i = 0; i < MAXQUOTAS; i++)
		if (old_opts.s_qf_names[i] &&
		    old_opts.s_qf_names[i] != sbi->s_qf_names[i])
			kfree(old_opts.s_qf_names[i]);
#endif
L
Linus Torvalds 已提交
2520
	return 0;
J
Jan Kara 已提交
2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536
restore_opts:
	sb->s_flags = old_sb_flags;
	sbi->s_mount_opt = old_opts.s_mount_opt;
	sbi->s_resuid = old_opts.s_resuid;
	sbi->s_resgid = old_opts.s_resgid;
	sbi->s_commit_interval = old_opts.s_commit_interval;
#ifdef CONFIG_QUOTA
	sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
	for (i = 0; i < MAXQUOTAS; i++) {
		if (sbi->s_qf_names[i] &&
		    old_opts.s_qf_names[i] != sbi->s_qf_names[i])
			kfree(sbi->s_qf_names[i]);
		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
	}
#endif
	return err;
L
Linus Torvalds 已提交
2537 2538
}

2539
static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
L
Linus Torvalds 已提交
2540
{
2541
	struct super_block *sb = dentry->d_sb;
A
Alex Tomas 已提交
2542 2543
	struct ext3_sb_info *sbi = EXT3_SB(sb);
	struct ext3_super_block *es = sbi->s_es;
P
Pekka Enberg 已提交
2544
	u64 fsid;
L
Linus Torvalds 已提交
2545

B
Badari Pulavarty 已提交
2546 2547 2548 2549 2550
	if (test_opt(sb, MINIX_DF)) {
		sbi->s_overhead_last = 0;
	} else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
		unsigned long ngroups = sbi->s_groups_count, i;
		ext3_fsblk_t overhead = 0;
L
Linus Torvalds 已提交
2551 2552 2553
		smp_rmb();

		/*
B
Badari Pulavarty 已提交
2554 2555 2556
		 * 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.
L
Linus Torvalds 已提交
2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579
		 */

		/*
		 * All of the blocks before first_data_block are
		 * overhead
		 */
		overhead = le32_to_cpu(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 < ngroups; i++) {
			overhead += ext3_bg_has_super(sb, i) +
				ext3_bg_num_gdb(sb, i);
			cond_resched();
		}

		/*
		 * Every block group has an inode bitmap, a block
		 * bitmap, and an inode table.
		 */
B
Badari Pulavarty 已提交
2580 2581 2582 2583
		overhead += ngroups * (2 + sbi->s_itb_per_group);
		sbi->s_overhead_last = overhead;
		smp_wmb();
		sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count);
L
Linus Torvalds 已提交
2584 2585 2586 2587
	}

	buf->f_type = EXT3_SUPER_MAGIC;
	buf->f_bsize = sb->s_blocksize;
B
Badari Pulavarty 已提交
2588
	buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
P
Peter Zijlstra 已提交
2589
	buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
B
Badari Pulavarty 已提交
2590
	es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
L
Linus Torvalds 已提交
2591 2592 2593 2594
	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))
		buf->f_bavail = 0;
	buf->f_files = le32_to_cpu(es->s_inodes_count);
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	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
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	es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
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	buf->f_namelen = EXT3_NAME_LEN;
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	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;
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	return 0;
}

/* Helper function for writing quotas on sync - we need to start transaction before quota file
 * is locked for write. Otherwise the are possible deadlocks:
 * Process 1                         Process 2
 * ext3_create()                     quota_sync()
 *   journal_start()                   write_dquot()
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 *   DQUOT_INIT()                        down(dqio_mutex)
 *     down(dqio_mutex)                    journal_start()
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 *
 */

#ifdef CONFIG_QUOTA

static inline struct inode *dquot_to_inode(struct dquot *dquot)
{
	return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
}

static int ext3_dquot_initialize(struct inode *inode, int type)
{
	handle_t *handle;
	int ret, err;

	/* We may create quota structure so we need to reserve enough blocks */
2628
	handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
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	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_initialize(inode, type);
	err = ext3_journal_stop(handle);
	if (!ret)
		ret = err;
	return ret;
}

static int ext3_dquot_drop(struct inode *inode)
{
	handle_t *handle;
	int ret, err;

	/* We may delete quota structure so we need to reserve enough blocks */
2644
	handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2645 2646 2647 2648 2649 2650
	if (IS_ERR(handle)) {
		/*
		 * We call dquot_drop() anyway to at least release references
		 * to quota structures so that umount does not hang.
		 */
		dquot_drop(inode);
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		return PTR_ERR(handle);
2652
	}
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	ret = dquot_drop(inode);
	err = ext3_journal_stop(handle);
	if (!ret)
		ret = err;
	return ret;
}

static int ext3_write_dquot(struct dquot *dquot)
{
	int ret, err;
	handle_t *handle;
	struct inode *inode;

	inode = dquot_to_inode(dquot);
	handle = ext3_journal_start(inode,
2668
					EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
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	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit(dquot);
	err = ext3_journal_stop(handle);
	if (!ret)
		ret = err;
	return ret;
}

static int ext3_acquire_dquot(struct dquot *dquot)
{
	int ret, err;
	handle_t *handle;

	handle = ext3_journal_start(dquot_to_inode(dquot),
2684
					EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
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	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_acquire(dquot);
	err = ext3_journal_stop(handle);
	if (!ret)
		ret = err;
	return ret;
}

static int ext3_release_dquot(struct dquot *dquot)
{
	int ret, err;
	handle_t *handle;

	handle = ext3_journal_start(dquot_to_inode(dquot),
2700
					EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
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	if (IS_ERR(handle)) {
		/* Release dquot anyway to avoid endless cycle in dqput() */
		dquot_release(dquot);
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2704
		return PTR_ERR(handle);
J
Jan Kara 已提交
2705
	}
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2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746
	ret = dquot_release(dquot);
	err = ext3_journal_stop(handle);
	if (!ret)
		ret = err;
	return ret;
}

static int ext3_mark_dquot_dirty(struct dquot *dquot)
{
	/* Are we journalling quotas? */
	if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
	    EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
		dquot_mark_dquot_dirty(dquot);
		return ext3_write_dquot(dquot);
	} else {
		return dquot_mark_dquot_dirty(dquot);
	}
}

static int ext3_write_info(struct super_block *sb, int type)
{
	int ret, err;
	handle_t *handle;

	/* Data block + inode block */
	handle = ext3_journal_start(sb->s_root->d_inode, 2);
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit_info(sb, type);
	err = ext3_journal_stop(handle);
	if (!ret)
		ret = err;
	return ret;
}

/*
 * Turn on quotas during mount time - we need to find
 * the quota file and such...
 */
static int ext3_quota_on_mount(struct super_block *sb, int type)
{
2747 2748
	return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
			EXT3_SB(sb)->s_jquota_fmt, type);
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}

/*
 * Standard function to be called on quota_on
 */
static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2755
			 char *path, int remount)
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2756 2757 2758 2759
{
	int err;
	struct nameidata nd;

2760 2761
	if (!test_opt(sb, QUOTA))
		return -EINVAL;
2762 2763
	/* When remounting, no checks are needed and in fact, path is NULL */
	if (remount)
2764
		return vfs_quota_on(sb, type, format_id, path, remount);
2765

L
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2766 2767 2768
	err = path_lookup(path, LOOKUP_FOLLOW, &nd);
	if (err)
		return err;
2769

L
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2770
	/* Quotafile not on the same filesystem? */
2771
	if (nd.path.mnt->mnt_sb != sb) {
J
Jan Blunck 已提交
2772
		path_put(&nd.path);
L
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2773 2774
		return -EXDEV;
	}
2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797
	/* Journaling quota? */
	if (EXT3_SB(sb)->s_qf_names[type]) {
		/* Quotafile not of fs root? */
		if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode)
			printk(KERN_WARNING
				"EXT3-fs: Quota file not on filesystem root. "
				"Journaled quota will not work.\n");
	}

	/*
	 * When we journal data on quota file, we have to flush journal to see
	 * all updates to the file when we bypass pagecache...
	 */
	if (ext3_should_journal_data(nd.path.dentry->d_inode)) {
		/*
		 * We don't need to lock updates but journal_flush() could
		 * otherwise be livelocked...
		 */
		journal_lock_updates(EXT3_SB(sb)->s_journal);
		journal_flush(EXT3_SB(sb)->s_journal);
		journal_unlock_updates(EXT3_SB(sb)->s_journal);
	}

J
Jan Blunck 已提交
2798
	path_put(&nd.path);
2799
	return vfs_quota_on(sb, type, format_id, path, remount);
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}

/* 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 ext3_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 >> EXT3_BLOCK_SIZE_BITS(sb);
	int err = 0;
	int offset = off & (sb->s_blocksize - 1);
	int tocopy;
	size_t toread;
	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;
		bh = ext3_bread(NULL, inode, blk, 0, &err);
		if (err)
			return err;
		if (!bh)	/* A hole? */
			memset(data, 0, tocopy);
		else
			memcpy(data, bh->b_data+offset, tocopy);
		brelse(bh);
		offset = 0;
		toread -= tocopy;
		data += tocopy;
		blk++;
	}
	return len;
}

/* Write to quotafile (we know the transaction is already started and has
 * enough credits) */
static ssize_t ext3_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 >> EXT3_BLOCK_SIZE_BITS(sb);
	int err = 0;
	int offset = off & (sb->s_blocksize - 1);
	int tocopy;
	int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
	size_t towrite = len;
	struct buffer_head *bh;
	handle_t *handle = journal_current_handle();

J
Jan Kara 已提交
2857 2858 2859 2860 2861 2862
	if (!handle) {
		printk(KERN_WARNING "EXT3-fs: Quota write (off=%Lu, len=%Lu)"
			" cancelled because transaction is not started.\n",
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}
2863
	mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
L
Linus Torvalds 已提交
2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896
	while (towrite > 0) {
		tocopy = sb->s_blocksize - offset < towrite ?
				sb->s_blocksize - offset : towrite;
		bh = ext3_bread(handle, inode, blk, 1, &err);
		if (!bh)
			goto out;
		if (journal_quota) {
			err = ext3_journal_get_write_access(handle, bh);
			if (err) {
				brelse(bh);
				goto out;
			}
		}
		lock_buffer(bh);
		memcpy(bh->b_data+offset, data, tocopy);
		flush_dcache_page(bh->b_page);
		unlock_buffer(bh);
		if (journal_quota)
			err = ext3_journal_dirty_metadata(handle, bh);
		else {
			/* Always do at least ordered writes for quotas */
			err = ext3_journal_dirty_data(handle, bh);
			mark_buffer_dirty(bh);
		}
		brelse(bh);
		if (err)
			goto out;
		offset = 0;
		towrite -= tocopy;
		data += tocopy;
		blk++;
	}
out:
2897 2898
	if (len == towrite) {
		mutex_unlock(&inode->i_mutex);
L
Linus Torvalds 已提交
2899
		return err;
2900
	}
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2901 2902 2903 2904 2905 2906 2907
	if (inode->i_size < off+len-towrite) {
		i_size_write(inode, off+len-towrite);
		EXT3_I(inode)->i_disksize = inode->i_size;
	}
	inode->i_version++;
	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	ext3_mark_inode_dirty(handle, inode);
2908
	mutex_unlock(&inode->i_mutex);
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2909 2910 2911 2912 2913
	return len - towrite;
}

#endif

2914 2915
static int ext3_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
L
Linus Torvalds 已提交
2916
{
2917
	return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
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2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942
}

static struct file_system_type ext3_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext3",
	.get_sb		= ext3_get_sb,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};

static int __init init_ext3_fs(void)
{
	int err = init_ext3_xattr();
	if (err)
		return err;
	err = init_inodecache();
	if (err)
		goto out1;
        err = register_filesystem(&ext3_fs_type);
	if (err)
		goto out;
	return 0;
out:
	destroy_inodecache();
out1:
2943
	exit_ext3_xattr();
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2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958
	return err;
}

static void __exit exit_ext3_fs(void)
{
	unregister_filesystem(&ext3_fs_type);
	destroy_inodecache();
	exit_ext3_xattr();
}

MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
MODULE_LICENSE("GPL");
module_init(init_ext3_fs)
module_exit(exit_ext3_fs)