xfs_super.c

linux-2.6.15.6

{
	filemap_flush(((struct inode *)inode)->i_mapping);
	iput((struct inode *)inode);
}

void
xfs_flush_inode(
	xfs_inode_t	*ip)
{
	struct inode	*inode = LINVFS_GET_IP(XFS_ITOV(ip));
	struct vfs	*vfs = XFS_MTOVFS(ip->i_mount);

	igrab(inode);
	xfs_syncd_queue_work(vfs, inode, xfs_flush_inode_work);
	delay(msecs_to_jiffies(500));
}

/*
 * This is the "bigger hammer" version of xfs_flush_inode_work...
 * (IOW, "If at first you don't succeed, use a Bigger Hammer").
 */
STATIC void
xfs_flush_device_work(
	vfs_t		*vfs,
	void		*inode)
{
	sync_blockdev(vfs->vfs_super->s_bdev);
	iput((struct inode *)inode);
}

void
xfs_flush_device(
	xfs_inode_t	*ip)
{
	struct inode	*inode = LINVFS_GET_IP(XFS_ITOV(ip));
	struct vfs	*vfs = XFS_MTOVFS(ip->i_mount);

	igrab(inode);
	xfs_syncd_queue_work(vfs, inode, xfs_flush_device_work);
	delay(msecs_to_jiffies(500));
	xfs_log_force(ip->i_mount, (xfs_lsn_t)0, XFS_LOG_FORCE|XFS_LOG_SYNC);
}

#define SYNCD_FLAGS	(SYNC_FSDATA|SYNC_BDFLUSH|SYNC_ATTR)
STATIC void
vfs_sync_worker(
	vfs_t		*vfsp,
	void		*unused)
{
	int		error;

	if (!(vfsp->vfs_flag & VFS_RDONLY))
		VFS_SYNC(vfsp, SYNCD_FLAGS, NULL, error);
	vfsp->vfs_sync_seq++;
	wmb();
	wake_up(&vfsp->vfs_wait_single_sync_task);
}

STATIC int
xfssyncd(
	void			*arg)
{
	long			timeleft;
	vfs_t			*vfsp = (vfs_t *) arg;
	struct vfs_sync_work	*work, *n;
	LIST_HEAD		(tmp);

	timeleft = xfs_syncd_centisecs * msecs_to_jiffies(10);
	for (;;) {
		timeleft = schedule_timeout_interruptible(timeleft);
		/* swsusp */
		try_to_freeze();
		if (kthread_should_stop())
			break;

		spin_lock(&vfsp->vfs_sync_lock);
		/*
		 * We can get woken by laptop mode, to do a sync -
		 * that's the (only!) case where the list would be
		 * empty with time remaining.
		 */
		if (!timeleft || list_empty(&vfsp->vfs_sync_list)) {
			if (!timeleft)
				timeleft = xfs_syncd_centisecs *
							msecs_to_jiffies(10);
			INIT_LIST_HEAD(&vfsp->vfs_sync_work.w_list);
			list_add_tail(&vfsp->vfs_sync_work.w_list,
					&vfsp->vfs_sync_list);
		}
		list_for_each_entry_safe(work, n, &vfsp->vfs_sync_list, w_list)
			list_move(&work->w_list, &tmp);
		spin_unlock(&vfsp->vfs_sync_lock);

		list_for_each_entry_safe(work, n, &tmp, w_list) {
			(*work->w_syncer)(vfsp, work->w_data);
			list_del(&work->w_list);
			if (work == &vfsp->vfs_sync_work)
				continue;
			kmem_free(work, sizeof(struct vfs_sync_work));
		}
	}

	return 0;
}

STATIC int
linvfs_start_syncd(
	vfs_t			*vfsp)
{
	vfsp->vfs_sync_work.w_syncer = vfs_sync_worker;
	vfsp->vfs_sync_work.w_vfs = vfsp;
	vfsp->vfs_sync_task = kthread_run(xfssyncd, vfsp, "xfssyncd");
	if (IS_ERR(vfsp->vfs_sync_task))
		return -PTR_ERR(vfsp->vfs_sync_task);
	return 0;
}

STATIC void
linvfs_stop_syncd(
	vfs_t			*vfsp)
{
	kthread_stop(vfsp->vfs_sync_task);
}

STATIC void
linvfs_put_super(
	struct super_block	*sb)
{
	vfs_t			*vfsp = LINVFS_GET_VFS(sb);
	int			error;

	linvfs_stop_syncd(vfsp);
	VFS_SYNC(vfsp, SYNC_ATTR|SYNC_DELWRI, NULL, error);
	if (!error)
		VFS_UNMOUNT(vfsp, 0, NULL, error);
	if (error) {
		printk("XFS unmount got error %d\n", error);
		printk("%s: vfsp/0x%p left dangling!\n", __FUNCTION__, vfsp);
		return;
	}

	vfs_deallocate(vfsp);
}

STATIC void
linvfs_write_super(
	struct super_block	*sb)
{
	vfs_t			*vfsp = LINVFS_GET_VFS(sb);
	int			error;

	if (sb->s_flags & MS_RDONLY) {
		sb->s_dirt = 0; /* paranoia */
		return;
	}
	/* Push the log and superblock a little */
	VFS_SYNC(vfsp, SYNC_FSDATA, NULL, error);
	sb->s_dirt = 0;
}

STATIC int
linvfs_sync_super(
	struct super_block	*sb,
	int			wait)
{
	vfs_t		*vfsp = LINVFS_GET_VFS(sb);
	int		error;
	int		flags = SYNC_FSDATA;

	if (unlikely(sb->s_frozen == SB_FREEZE_WRITE))
		flags = SYNC_QUIESCE;
	else
		flags = SYNC_FSDATA | (wait ? SYNC_WAIT : 0);

	VFS_SYNC(vfsp, flags, NULL, error);
	sb->s_dirt = 0;

	if (unlikely(laptop_mode)) {
		int	prev_sync_seq = vfsp->vfs_sync_seq;

		/*
		 * The disk must be active because we're syncing.
		 * We schedule xfssyncd now (now that the disk is
		 * active) instead of later (when it might not be).
		 */
		wake_up_process(vfsp->vfs_sync_task);
		/*
		 * We have to wait for the sync iteration to complete.
		 * If we don't, the disk activity caused by the sync
		 * will come after the sync is completed, and that
		 * triggers another sync from laptop mode.
		 */
		wait_event(vfsp->vfs_wait_single_sync_task,
				vfsp->vfs_sync_seq != prev_sync_seq);
	}

	return -error;
}

STATIC int
linvfs_statfs(
	struct super_block	*sb,
	struct kstatfs		*statp)
{
	vfs_t			*vfsp = LINVFS_GET_VFS(sb);
	int			error;

	VFS_STATVFS(vfsp, statp, NULL, error);
	return -error;
}

STATIC int
linvfs_remount(
	struct super_block	*sb,
	int			*flags,
	char			*options)
{
	vfs_t			*vfsp = LINVFS_GET_VFS(sb);
	struct xfs_mount_args	*args = xfs_args_allocate(sb);
	int			error;

	VFS_PARSEARGS(vfsp, options, args, 1, error);
	if (!error)
		VFS_MNTUPDATE(vfsp, flags, args, error);
	kmem_free(args, sizeof(*args));
	return -error;
}

STATIC void
linvfs_freeze_fs(
	struct super_block	*sb)
{
	VFS_FREEZE(LINVFS_GET_VFS(sb));
}

STATIC int
linvfs_show_options(
	struct seq_file		*m,
	struct vfsmount		*mnt)
{
	struct vfs		*vfsp = LINVFS_GET_VFS(mnt->mnt_sb);
	int			error;

	VFS_SHOWARGS(vfsp, m, error);
	return error;
}

STATIC int
linvfs_quotasync(
	struct super_block	*sb,
	int			type)
{
	struct vfs		*vfsp = LINVFS_GET_VFS(sb);
	int			error;

	VFS_QUOTACTL(vfsp, Q_XQUOTASYNC, 0, (caddr_t)NULL, error);
	return -error;
}

STATIC int
linvfs_getxstate(
	struct super_block	*sb,
	struct fs_quota_stat	*fqs)
{
	struct vfs		*vfsp = LINVFS_GET_VFS(sb);
	int			error;

	VFS_QUOTACTL(vfsp, Q_XGETQSTAT, 0, (caddr_t)fqs, error);
	return -error;
}

STATIC int
linvfs_setxstate(
	struct super_block	*sb,
	unsigned int		flags,
	int			op)
{
	struct vfs		*vfsp = LINVFS_GET_VFS(sb);
	int			error;

	VFS_QUOTACTL(vfsp, op, 0, (caddr_t)&flags, error);
	return -error;
}

STATIC int
linvfs_getxquota(
	struct super_block	*sb,
	int			type,
	qid_t			id,
	struct fs_disk_quota	*fdq)
{
	struct vfs		*vfsp = LINVFS_GET_VFS(sb);
	int			error, getmode;

	getmode = (type == USRQUOTA) ? Q_XGETQUOTA :
		 ((type == GRPQUOTA) ? Q_XGETGQUOTA : Q_XGETPQUOTA);
	VFS_QUOTACTL(vfsp, getmode, id, (caddr_t)fdq, error);
	return -error;
}

STATIC int
linvfs_setxquota(
	struct super_block	*sb,
	int			type,
	qid_t			id,
	struct fs_disk_quota	*fdq)
{
	struct vfs		*vfsp = LINVFS_GET_VFS(sb);
	int			error, setmode;

	setmode = (type == USRQUOTA) ? Q_XSETQLIM :
		 ((type == GRPQUOTA) ? Q_XSETGQLIM : Q_XSETPQLIM);
	VFS_QUOTACTL(vfsp, setmode, id, (caddr_t)fdq, error);
	return -error;
}

STATIC int
linvfs_fill_super(
	struct super_block	*sb,
	void			*data,
	int			silent)
{
	vnode_t			*rootvp;
	struct vfs		*vfsp = vfs_allocate();
	struct xfs_mount_args	*args = xfs_args_allocate(sb);
	struct kstatfs		statvfs;
	int			error, error2;

	vfsp->vfs_super = sb;
	LINVFS_SET_VFS(sb, vfsp);
	if (sb->s_flags & MS_RDONLY)
		vfsp->vfs_flag |= VFS_RDONLY;
	bhv_insert_all_vfsops(vfsp);

	VFS_PARSEARGS(vfsp, (char *)data, args, 0, error);
	if (error) {
		bhv_remove_all_vfsops(vfsp, 1);
		goto fail_vfsop;
	}

	sb_min_blocksize(sb, BBSIZE);
#ifdef CONFIG_XFS_EXPORT
	sb->s_export_op = &linvfs_export_ops;
#endif
	sb->s_qcop = &linvfs_qops;
	sb->s_op = &linvfs_sops;

	VFS_MOUNT(vfsp, args, NULL, error);
	if (error) {
		bhv_remove_all_vfsops(vfsp, 1);
		goto fail_vfsop;
	}

	VFS_STATVFS(vfsp, &statvfs, NULL, error);
	if (error)
		goto fail_unmount;

	sb->s_dirt = 1;
	sb->s_magic = statvfs.f_type;
	sb->s_blocksize = statvfs.f_bsize;
	sb->s_blocksize_bits = ffs(statvfs.f_bsize) - 1;
	sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
	sb->s_time_gran = 1;
	set_posix_acl_flag(sb);

	VFS_ROOT(vfsp, &rootvp, error);
	if (error)
		goto fail_unmount;

	sb->s_root = d_alloc_root(LINVFS_GET_IP(rootvp));
	if (!sb->s_root) {
		error = ENOMEM;
		goto fail_vnrele;
	}
	if (is_bad_inode(sb->s_root->d_inode)) {
		error = EINVAL;
		goto fail_vnrele;
	}
	if ((error = linvfs_start_syncd(vfsp)))
		goto fail_vnrele;
	vn_trace_exit(rootvp, __FUNCTION__, (inst_t *)__return_address);

	kmem_free(args, sizeof(*args));
	return 0;

fail_vnrele:
	if (sb->s_root) {
		dput(sb->s_root);
		sb->s_root = NULL;
	} else {
		VN_RELE(rootvp);
	}

fail_unmount:
	VFS_UNMOUNT(vfsp, 0, NULL, error2);

fail_vfsop:
	vfs_deallocate(vfsp);
	kmem_free(args, sizeof(*args));
	return -error;
}

STATIC struct super_block *
linvfs_get_sb(
	struct file_system_type	*fs_type,
	int			flags,
	const char		*dev_name,
	void			*data)
{
	return get_sb_bdev(fs_type, flags, dev_name, data, linvfs_fill_super);
}

STATIC struct super_operations linvfs_sops = {
	.alloc_inode		= linvfs_alloc_inode,
	.destroy_inode		= linvfs_destroy_inode,
	.write_inode		= linvfs_write_inode,
	.clear_inode		= linvfs_clear_inode,
	.put_super		= linvfs_put_super,
	.write_super		= linvfs_write_super,
	.sync_fs		= linvfs_sync_super,
	.write_super_lockfs	= linvfs_freeze_fs,
	.statfs			= linvfs_statfs,
	.remount_fs		= linvfs_remount,
	.show_options		= linvfs_show_options,
};

STATIC struct quotactl_ops linvfs_qops = {
	.quota_sync		= linvfs_quotasync,
	.get_xstate		= linvfs_getxstate,
	.set_xstate		= linvfs_setxstate,
	.get_xquota		= linvfs_getxquota,
	.set_xquota		= linvfs_setxquota,
};

STATIC struct file_system_type xfs_fs_type = {
	.owner			= THIS_MODULE,
	.name			= "xfs",
	.get_sb			= linvfs_get_sb,
	.kill_sb		= kill_block_super,
	.fs_flags		= FS_REQUIRES_DEV,
};


STATIC int __init
init_xfs_fs( void )
{
	int			error;
	struct sysinfo		si;
	static char		message[] __initdata = KERN_INFO \
		XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled\n";

	printk(message);

	si_meminfo(&si);
	xfs_physmem = si.totalram;

	ktrace_init(64);

	error = linvfs_init_zones();
	if (error < 0)
		goto undo_zones;

	error = pagebuf_init();
	if (error < 0)
		goto undo_pagebuf;

	vn_init();
	xfs_init();
	uuid_init();
	vfs_initquota();

	error = register_filesystem(&xfs_fs_type);
	if (error)
		goto undo_register;
	XFS_DM_INIT(&xfs_fs_type);
	return 0;

undo_register:
	pagebuf_terminate();

undo_pagebuf:
	linvfs_destroy_zones();

undo_zones:
	return error;
}

STATIC void __exit
exit_xfs_fs( void )
{
	vfs_exitquota();
	XFS_DM_EXIT(&xfs_fs_type);
	unregister_filesystem(&xfs_fs_type);
	xfs_cleanup();
	pagebuf_terminate();
	linvfs_destroy_zones();
	ktrace_uninit();
}

module_init(init_xfs_fs);
module_exit(exit_xfs_fs);

MODULE_AUTHOR("Silicon Graphics, Inc.");
MODULE_DESCRIPTION(XFS_VERSION_STRING " with " XFS_BUILD_OPTIONS " enabled");
MODULE_LICENSE("GPL");