xfs_super.c

来自「优龙2410linux2.6.8内核源代码」· C语言 代码 · 共 898 行 · 第 1/2 页

	wmb();

	wake_up_process(vfsp->vfs_sync_task);
	wait_event(vfsp->vfs_wait_sync_task, !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 (wait)
		flags |= SYNC_WAIT;

	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 syncd 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 struct dentry *
linvfs_get_parent(
	struct dentry		*child)
{
	int			error;
	vnode_t			*vp, *cvp;
	struct dentry		*parent;
	struct inode		*ip = NULL;
	struct dentry		dotdot;

	dotdot.d_name.name = "..";
	dotdot.d_name.len = 2;
	dotdot.d_inode = 0;

	cvp = NULL;
	vp = LINVFS_GET_VP(child->d_inode);
	VOP_LOOKUP(vp, &dotdot, &cvp, 0, NULL, NULL, error);

	if (!error) {
		ASSERT(cvp);
		ip = LINVFS_GET_IP(cvp);
		if (!ip) {
			VN_RELE(cvp);
			return ERR_PTR(-EACCES);
		}
	}
	if (error)
		return ERR_PTR(-error);
	parent = d_alloc_anon(ip);
	if (!parent) {
		VN_RELE(cvp);
		parent = ERR_PTR(-ENOMEM);
	}
	return parent;
}

STATIC struct dentry *
linvfs_get_dentry(
	struct super_block	*sb,
	void			*data)
{
	vnode_t			*vp;
	struct inode		*inode;
	struct dentry		*result;
	xfs_fid2_t		xfid;
	vfs_t			*vfsp = LINVFS_GET_VFS(sb);
	int			error;

	xfid.fid_len = sizeof(xfs_fid2_t) - sizeof(xfid.fid_len);
	xfid.fid_pad = 0;
	xfid.fid_gen = ((__u32 *)data)[1];
	xfid.fid_ino = ((__u32 *)data)[0];

	VFS_VGET(vfsp, &vp, (fid_t *)&xfid, error);
	if (error || vp == NULL)
		return ERR_PTR(-ESTALE) ;

	inode = LINVFS_GET_IP(vp);
	result = d_alloc_anon(inode);
        if (!result) {
		iput(inode);
		return ERR_PTR(-ENOMEM);
	}
	return result;
}

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_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 == GRPQUOTA) ? Q_XGETGQUOTA : Q_XGETQUOTA;
	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 == GRPQUOTA) ? Q_XSETGQLIM : Q_XSETQLIM;
	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);
	sb->s_export_op = &linvfs_export_ops;
	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);
	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 export_operations linvfs_export_ops = {
	.get_parent		= linvfs_get_parent,
	.get_dentry		= linvfs_get_dentry,
};

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 = {
	.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 = init_inodecache();
	if (error < 0)
		goto undo_inodecache;

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

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

	xfs_inode_shaker = kmem_shake_register(xfs_inode_shake);
	if (!xfs_inode_shaker) {
		error = -ENOMEM;
		goto undo_shaker;
	}

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

undo_register:
	kmem_shake_deregister(xfs_inode_shaker);

undo_shaker:
	pagebuf_terminate();

undo_pagebuf:
	destroy_inodecache();

undo_inodecache:
	return error;
}

STATIC void __exit
exit_xfs_fs( void )
{
	vfs_exitquota();
	XFS_DM_EXIT(&xfs_fs_type);
	unregister_filesystem(&xfs_fs_type);
	kmem_shake_deregister(xfs_inode_shaker);
	xfs_cleanup();
	pagebuf_terminate();
	destroy_inodecache();
	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");