super.c 82.3 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(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");

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	if (test_opt(sb, DATA_ERR_ABORT))
		seq_puts(seq, ",data_err=abort");

631
	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"
	 */
655 656 657 658
	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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}

680
#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,
758
	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,
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	Opt_data_err_abort, Opt_data_err_ignore,
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	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
762
	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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};

767
static const match_table_t tokens = {
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	{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"},
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	{Opt_data_err_abort, "data_err=abort"},
	{Opt_data_err_ignore, "data_err=ignore"},
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	{Opt_offusrjquota, "usrjquota="},
	{Opt_usrjquota, "usrjquota=%s"},
	{Opt_offgrpjquota, "grpjquota="},
	{Opt_grpjquota, "grpjquota=%s"},
	{Opt_jqfmt_vfsold, "jqfmt=vfsold"},
	{Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
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	{Opt_grpquota, "grpquota"},
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	{Opt_noquota, "noquota"},
	{Opt_quota, "quota"},
814
	{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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};

820
static ext3_fsblk_t get_sb_block(void **data)
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{
822 823
	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;
828
	/*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;
}

841
static int parse_options (char *options, struct super_block *sb,
842
			  unsigned int *inum, unsigned long *journal_devnum,
843
			  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
851
	int qtype, qfmt;
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	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;
976 977 978 979 980 981 982 983 984 985
		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;
1020 1021 1022 1023 1024 1025
		case Opt_data_err_abort:
			set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
			break;
		case Opt_data_err_ignore:
			clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
			break;
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#ifdef CONFIG_QUOTA
		case Opt_usrjquota:
			qtype = USRQUOTA;
			goto set_qf_name;
		case Opt_grpjquota:
			qtype = GRPQUOTA;
set_qf_name:
1033 1034 1035
			if ((sb_any_quota_enabled(sb) ||
			     sb_any_quota_suspended(sb)) &&
			    !sbi->s_qf_names[qtype]) {
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				printk(KERN_ERR
1037
					"EXT3-fs: Cannot change journaled "
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					"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;
			}
1065
			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:
1073 1074 1075
			if ((sb_any_quota_enabled(sb) ||
			     sb_any_quota_suspended(sb)) &&
			    sbi->s_qf_names[qtype]) {
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				printk(KERN_ERR "EXT3-fs: Cannot change "
1077
					"journaled quota options when "
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					"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:
1088 1089
			qfmt = QFMT_VFS_OLD;
			goto set_qf_format;
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		case Opt_jqfmt_vfsv0:
1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101
			qfmt = QFMT_VFS_V0;
set_qf_format:
			if ((sb_any_quota_enabled(sb) ||
			     sb_any_quota_suspended(sb)) &&
			    sbi->s_jquota_fmt != qfmt) {
				printk(KERN_ERR "EXT3-fs: Cannot change "
					"journaled quota options when "
					"quota turned on.\n");
				return 0;
			}
			sbi->s_jquota_fmt = qfmt;
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			break;
1103
		case Opt_quota:
1104 1105 1106 1107 1108
		case Opt_usrquota:
			set_opt(sbi->s_mount_opt, QUOTA);
			set_opt(sbi->s_mount_opt, USRQUOTA);
			break;
		case Opt_grpquota:
1109
			set_opt(sbi->s_mount_opt, QUOTA);
1110
			set_opt(sbi->s_mount_opt, GRPQUOTA);
1111 1112
			break;
		case Opt_noquota:
1113 1114
			if (sb_any_quota_enabled(sb) ||
			    sb_any_quota_suspended(sb)) {
1115 1116 1117 1118 1119
				printk(KERN_ERR "EXT3-fs: Cannot change quota "
					"options when quota turned on.\n");
				return 0;
			}
			clear_opt(sbi->s_mount_opt, QUOTA);
1120 1121
			clear_opt(sbi->s_mount_opt, USRQUOTA);
			clear_opt(sbi->s_mount_opt, GRPQUOTA);
1122
			break;
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#else
1124 1125 1126
		case Opt_quota:
		case Opt_usrquota:
		case Opt_grpquota:
1127 1128 1129
			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
1137
				"EXT3-fs: journaled quota options not "
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				"supported.\n");
			break;
1140 1141
		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;
			}
1162 1163
			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;
1169 1170 1171
		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
1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198
	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) {
1199
			printk(KERN_ERR "EXT3-fs: journaled quota format "
1200 1201 1202 1203 1204
					"not specified.\n");
			return 0;
		}
	} else {
		if (sbi->s_jquota_fmt) {
1205 1206
			printk(KERN_ERR "EXT3-fs: journaled quota format "
					"specified with no journaling "
1207 1208 1209
					"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! :) */
1252
	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);
1256
	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 */
1284
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");

1291 1292
	for (i = 0; i < sbi->s_groups_count; i++) {
		struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL);
1293 1294
		ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i);
		ext3_fsblk_t last_block;
1295

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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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Eric Sandeen 已提交
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		if (le32_to_cpu(gdp->bg_inode_table) < first_block ||
1323
		    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;
	}

1371 1372 1373 1374 1375 1376
	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
1400
					"EXT3-fs: Cannot turn on journaled "
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1401 1402 1403 1404 1405 1406 1407 1408
					"quota: error %d\n", ret);
		}
	}
#endif

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

1409 1410
		inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
		if (IS_ERR(inode)) {
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Linus Torvalds 已提交
1411 1412 1413 1414 1415 1416 1417 1418
			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
1419
				"%s: truncating inode %lu to %Ld bytes\n",
1420
				__func__, inode->i_ino, inode->i_size);
1421
			jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
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1422 1423 1424 1425 1426
				  inode->i_ino, inode->i_size);
			ext3_truncate(inode);
			nr_truncates++;
		} else {
			printk(KERN_DEBUG
1427
				"%s: deleting unreferenced inode %lu\n",
1428
				__func__, inode->i_ino);
1429
			jbd_debug(2, "deleting unreferenced inode %lu\n",
L
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1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447
				  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])
1448
			vfs_quota_off(sb, i, 0);
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1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461
	}
#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;
1462 1463 1464 1465 1466
	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
1467
	 * sectors in the file, including data and all indirect blocks,
1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486
	 * 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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1487 1488 1489 1490 1491 1492 1493

	res += 1LL << (bits-2);
	res += 1LL << (2*(bits-2));
	res += 1LL << (3*(bits-2));
	res <<= bits;
	if (res > upper_limit)
		res = upper_limit;
1494 1495 1496 1497

	if (res > MAX_LFS_FILESIZE)
		res = MAX_LFS_FILESIZE;

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	return res;
}

1501 1502
static ext3_fsblk_t descriptor_loc(struct super_block *sb,
				    ext3_fsblk_t logic_sb_block,
L
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				    int nr)
{
	struct ext3_sb_info *sbi = EXT3_SB(sb);
1506
	unsigned long bg, first_meta_bg;
L
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1507 1508 1509 1510 1511 1512 1513 1514 1515 1516
	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;
1517
	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;
1526 1527 1528
	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;
1530
	unsigned int journal_inum = 0;
1531
	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;
1539
	int ret = -EINVAL;
L
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1540
	__le32 features;
1541
	int err;
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1542

1543
	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
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1544 1545 1546 1547 1548 1549
	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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Miklos Szeredi 已提交
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	sbi->s_sb_block = sb_block;
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1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592

	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);
1593
#ifdef CONFIG_EXT3_FS_XATTR
L
Linus Torvalds 已提交
1594 1595
	if (def_mount_opts & EXT3_DEFM_XATTR_USER)
		set_opt(sbi->s_mount_opt, XATTR_USER);
1596 1597
#endif
#ifdef CONFIG_EXT3_FS_POSIX_ACL
L
Linus Torvalds 已提交
1598 1599
	if (def_mount_opts & EXT3_DEFM_ACL)
		set_opt(sbi->s_mount_opt, POSIX_ACL);
1600
#endif
L
Linus Torvalds 已提交
1601 1602 1603 1604 1605 1606 1607 1608 1609
	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);
1610
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE)
D
Dmitry Mishin 已提交
1611
		set_opt(sbi->s_mount_opt, ERRORS_CONT);
1612 1613
	else
		set_opt(sbi->s_mount_opt, ERRORS_RO);
L
Linus Torvalds 已提交
1614 1615 1616 1617 1618 1619

	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);

1620 1621
	if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
			    NULL, 0))
L
Linus Torvalds 已提交
1622 1623 1624 1625 1626 1627 1628 1629 1630
		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)))
1631
		printk(KERN_WARNING
L
Linus Torvalds 已提交
1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656
		       "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) {
1657
		printk(KERN_ERR
L
Linus Torvalds 已提交
1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675
		       "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);
1676 1677 1678 1679 1680
		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
1681 1682 1683 1684
		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) {
1685
			printk(KERN_ERR
L
Linus Torvalds 已提交
1686 1687 1688 1689 1690 1691
			       "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)) {
1692
			printk (KERN_ERR
L
Linus Torvalds 已提交
1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706
				"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
1707
		    (!is_power_of_2(sbi->s_inode_size)) ||
L
Linus Torvalds 已提交
1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726
		    (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);
1727
	if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0)
L
Linus Torvalds 已提交
1728 1729 1730 1731 1732 1733 1734 1735 1736
		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);
1737 1738
	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
1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761
	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;
	}

1762 1763 1764 1765 1766 1767 1768 1769 1770 1771
	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
1772 1773
	if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext3;
E
Eric Sandeen 已提交
1774 1775 1776
	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
1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798
	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)) {
1799
		printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n");
L
Linus Torvalds 已提交
1800 1801 1802 1803 1804
		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);
1805

1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819
	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;
	}
1820

L
Linus Torvalds 已提交
1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857
	/* 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)) {
1858
		if (ext3_load_journal(sb, es, journal_devnum))
1859
			goto failed_mount3;
L
Linus Torvalds 已提交
1860 1861
	} else if (journal_inum) {
		if (ext3_create_journal(sb, es, journal_inum))
1862
			goto failed_mount3;
L
Linus Torvalds 已提交
1863 1864 1865 1866 1867
	} else {
		if (!silent)
			printk (KERN_ERR
				"ext3: No journal on filesystem on %s\n",
				sb->s_id);
1868
		goto failed_mount3;
L
Linus Torvalds 已提交
1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890
	}

	/* 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");
1891
			goto failed_mount4;
L
Linus Torvalds 已提交
1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908
		}
	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.
	 */

1909 1910
	root = ext3_iget(sb, EXT3_ROOT_INO);
	if (IS_ERR(root)) {
L
Linus Torvalds 已提交
1911
		printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1912
		ret = PTR_ERR(root);
1913
		goto failed_mount4;
L
Linus Torvalds 已提交
1914 1915
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1916
		iput(root);
L
Linus Torvalds 已提交
1917
		printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1918
		goto failed_mount4;
L
Linus Torvalds 已提交
1919
	}
1920 1921 1922 1923 1924 1925 1926
	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
1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956

	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;

1957
failed_mount4:
L
Linus Torvalds 已提交
1958
	journal_destroy(sbi->s_journal);
1959 1960 1961 1962
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
1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977
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();
1978
	return ret;
L
Linus Torvalds 已提交
1979 1980 1981 1982 1983
}

/*
 * 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
1984
 * done any recovery; and again on any subsequent remount.
L
Linus Torvalds 已提交
1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000
 */
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;
2001 2002 2003 2004
	if (test_opt(sb, DATA_ERR_ABORT))
		journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR;
	else
		journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR;
L
Linus Torvalds 已提交
2005 2006 2007
	spin_unlock(&journal->j_state_lock);
}

2008 2009
static journal_t *ext3_get_journal(struct super_block *sb,
				   unsigned int journal_inum)
L
Linus Torvalds 已提交
2010 2011 2012 2013 2014 2015 2016 2017
{
	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. */

2018 2019
	journal_inode = ext3_iget(sb, journal_inum);
	if (IS_ERR(journal_inode)) {
L
Linus Torvalds 已提交
2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031
		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);
2032
	if (!S_ISREG(journal_inode->i_mode)) {
L
Linus Torvalds 已提交
2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053
		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;
2054
	ext3_fsblk_t start;
2055
	ext3_fsblk_t len;
L
Linus Torvalds 已提交
2056
	int hblock, blocksize;
2057
	ext3_fsblk_t sb_block;
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	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;
}

2139 2140 2141
static int ext3_load_journal(struct super_block *sb,
			     struct ext3_super_block *es,
			     unsigned long journal_devnum)
L
Linus Torvalds 已提交
2142 2143
{
	journal_t *journal;
2144
	unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2145
	dev_t journal_dev;
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2146 2147 2148
	int err = 0;
	int really_read_only;

2149 2150 2151 2152 2153 2154 2155 2156
	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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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 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214
	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);
2215 2216 2217 2218 2219 2220 2221 2222 2223 2224

	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,
2230
			       unsigned int journal_inum)
L
Linus Torvalds 已提交
2231 2232
{
	journal_t *journal;
2233
	int err;
L
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2234 2235 2236 2237 2238 2239 2240

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

2241 2242
	journal = ext3_get_journal(sb, journal_inum);
	if (!journal)
L
Linus Torvalds 已提交
2243 2244
		return -EINVAL;

2245
	printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n",
L
Linus Torvalds 已提交
2246 2247
	       journal_inum);

2248 2249
	err = journal_create(journal);
	if (err) {
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		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);
2300
	lock_super(sb);
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Linus Torvalds 已提交
2301 2302 2303 2304 2305 2306
	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);
	}
2307
	unlock_super(sb);
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Linus Torvalds 已提交
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
	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);
2335
		ext3_warning(sb, __func__, "Filesystem error recorded "
L
Linus Torvalds 已提交
2336
			     "from previous mount: %s", errstr);
2337
		ext3_warning(sb, __func__, "Marking fs in need of "
L
Linus Torvalds 已提交
2338 2339 2340 2341 2342 2343 2344 2345 2346 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
			     "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)
{
2377
	if (mutex_trylock(&sb->s_lock) != 0)
L
Linus Torvalds 已提交
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		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);
2435
	ext3_fsblk_t n_blocks_count = 0;
J
Jan Kara 已提交
2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453
	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
2454 2455 2456 2457

	/*
	 * Allow the "check" option to be passed as a remount option.
	 */
2458
	if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
J
Jan Kara 已提交
2459 2460 2461
		err = -EINVAL;
		goto restore_opts;
	}
L
Linus Torvalds 已提交
2462 2463

	if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2464
		ext3_abort(sb, __func__, "Abort forced by user");
L
Linus Torvalds 已提交
2465 2466 2467 2468 2469 2470 2471 2472 2473 2474

	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
2475 2476 2477 2478
		if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
			err = -EROFS;
			goto restore_opts;
		}
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2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495

		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);

2496 2497 2498 2499 2500
			/*
			 * We have to unlock super so that we can wait for
			 * transactions.
			 */
			unlock_super(sb);
L
Linus Torvalds 已提交
2501
			ext3_mark_recovery_complete(sb, es);
2502
			lock_super(sb);
L
Linus Torvalds 已提交
2503 2504 2505 2506 2507 2508 2509 2510
		} 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
2511 2512
				err = -EROFS;
				goto restore_opts;
L
Linus Torvalds 已提交
2513
			}
2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529

			/*
			 * 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
2530 2531 2532 2533 2534 2535 2536 2537
			/*
			 * 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);
2538
			if ((err = ext3_group_extend(sb, es, n_blocks_count)))
J
Jan Kara 已提交
2539
				goto restore_opts;
L
Linus Torvalds 已提交
2540 2541 2542 2543
			if (!ext3_setup_super (sb, es, 0))
				sb->s_flags &= ~MS_RDONLY;
		}
	}
J
Jan Kara 已提交
2544 2545 2546 2547 2548 2549 2550
#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
2551
	return 0;
J
Jan Kara 已提交
2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567
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
2568 2569
}

2570
static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
L
Linus Torvalds 已提交
2571
{
2572
	struct super_block *sb = dentry->d_sb;
A
Alex Tomas 已提交
2573 2574
	struct ext3_sb_info *sbi = EXT3_SB(sb);
	struct ext3_super_block *es = sbi->s_es;
P
Pekka Enberg 已提交
2575
	u64 fsid;
L
Linus Torvalds 已提交
2576

B
Badari Pulavarty 已提交
2577 2578 2579 2580 2581
	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
2582 2583 2584
		smp_rmb();

		/*
B
Badari Pulavarty 已提交
2585 2586 2587
		 * 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.
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		 */

		/*
		 * 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.
		 */
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		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);
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	}

	buf->f_type = EXT3_SUPER_MAGIC;
	buf->f_bsize = sb->s_blocksize;
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	buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last;
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	buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
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	es->s_free_blocks_count = cpu_to_le32(buf->f_bfree);
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	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 */
2659
	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 */
2675
	handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
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	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);
2683
	}
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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,
2699
					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),
2715
					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),
2731
					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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		return PTR_ERR(handle);
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	}
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	ret = dquot_release(dquot);
	err = ext3_journal_stop(handle);
	if (!ret)
		ret = err;
	return ret;
}

static int ext3_mark_dquot_dirty(struct dquot *dquot)
{
2746
	/* Are we journaling quotas? */
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	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)
{
2778 2779
	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,
2786
			 char *path, int remount)
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{
	int err;
	struct nameidata nd;

2791 2792
	if (!test_opt(sb, QUOTA))
		return -EINVAL;
2793 2794
	/* When remounting, no checks are needed and in fact, path is NULL */
	if (remount)
2795
		return vfs_quota_on(sb, type, format_id, path, remount);
2796

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	err = path_lookup(path, LOOKUP_FOLLOW, &nd);
	if (err)
		return err;
2800

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	/* Quotafile not on the same filesystem? */
2802
	if (nd.path.mnt->mnt_sb != sb) {
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		path_put(&nd.path);
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		return -EXDEV;
	}
2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828
	/* 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);
	}

2829
	err = vfs_quota_on_path(sb, type, format_id, &nd.path);
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	path_put(&nd.path);
2831
	return err;
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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();

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	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;
	}
2895
	mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
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	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:
2929 2930
	if (len == towrite) {
		mutex_unlock(&inode->i_mutex);
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2931
		return err;
2932
	}
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	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);
2940
	mutex_unlock(&inode->i_mutex);
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	return len - towrite;
}

#endif

2946 2947
static int ext3_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
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{
2949
	return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
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}

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:
2975
	exit_ext3_xattr();
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	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)