Commit message: xfs: clear sb->s_fs_info on mount failure

We recently had an oops reported on a 4.14 kernel in
xfs_reclaim_inodes_count() where sb->s_fs_info pointed to garbage
and so the m_perag_tree lookup walked into lala land.

Essentially, the machine was under memory pressure when the mount
was being run, xfs_fs_fill_super() failed after allocating the
xfs_mount and attaching it to sb->s_fs_info. It then cleaned up and
freed the xfs_mount, but the sb->s_fs_info field still pointed to
the freed memory. Hence when the superblock shrinker then ran
it fell off the bad pointer.

With the superblock shrinker problem fixed at teh VFS level, this
stale s_fs_info pointer is still a problem - we use it
unconditionally in ->put_super when the superblock is being torn
down, and hence we can still trip over it after a ->fill_super
call failure. Hence we need to clear s_fs_info if
xfs-fs_fill_super() fails, and we need to check if it's valid in
the places it can potentially be dereferenced after a ->fill_super
failure.

Signed-Off-By: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
CVE: CVE-2018-20976
CWE: CWE-416
Vulnerability description: An issue was discovered in fs/xfs/xfs_super.c in the Linux kernel before 4.18. A use after free exists, related to xfs_fs_fill_super failure.

Project: linux
File: xfs_super.c

xfs_finish_flags(
	struct xfs_mount	*mp)
{
	int			ronly = (mp->m_flags & XFS_MOUNT_RDONLY);

	/* Fail a mount where the logbuf is smaller than the log stripe */
	if (xfs_sb_version_haslogv2(&mp->m_sb)) {
		if (mp->m_logbsize <= 0 &&
		    mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE) {
			mp->m_logbsize = mp->m_sb.sb_logsunit;
		} else if (mp->m_logbsize > 0 &&
			   mp->m_logbsize < mp->m_sb.sb_logsunit) {
			xfs_warn(mp,
		"logbuf size must be greater than or equal to log stripe size");
			return -EINVAL;
		}
	} else {
		/* Fail a mount if the logbuf is larger than 32K */
		if (mp->m_logbsize > XLOG_BIG_RECORD_BSIZE) {
			xfs_warn(mp,
		"logbuf size for version 1 logs must be 16K or 32K");
			return -EINVAL;
		}
	}

	/*
	 * V5 filesystems always use attr2 format for attributes.
	 */
	if (xfs_sb_version_hascrc(&mp->m_sb) &&
	    (mp->m_flags & XFS_MOUNT_NOATTR2)) {
		xfs_warn(mp, "Cannot mount a V5 filesystem as noattr2. "
			     "attr2 is always enabled for V5 filesystems.");
		return -EINVAL;
	}

	/*
	 * mkfs'ed attr2 will turn on attr2 mount unless explicitly
	 * told by noattr2 to turn it off
	 */
	if (xfs_sb_version_hasattr2(&mp->m_sb) &&
	    !(mp->m_flags & XFS_MOUNT_NOATTR2))
		mp->m_flags |= XFS_MOUNT_ATTR2;

	/*
	 * prohibit r/w mounts of read-only filesystems
	 */
	if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
		xfs_warn(mp,
			"cannot mount a read-only filesystem as read-write");
		return -EROFS;
	}

	if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
	    (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
	    !xfs_sb_version_has_pquotino(&mp->m_sb)) {
		xfs_warn(mp,
		  "Super block does not support project and group quota together");
		return -EINVAL;
	}

	return 0;
}

Project: linux
File: xfs_super.c

xfs_fs_sync_fs(
	struct super_block	*sb,
	int			wait)
{
	struct xfs_mount	*mp = XFS_M(sb);

	/*
	 * Doing anything during the async pass would be counterproductive.
	 */
	if (!wait)
		return 0;

	xfs_log_force(mp, XFS_LOG_SYNC);
	if (laptop_mode) {
		/*
		 * The disk must be active because we're syncing.
		 * We schedule log work now (now that the disk is
		 * active) instead of later (when it might not be).
		 */
		flush_delayed_work(&mp->m_log->l_work);
	}

	return 0;
}

Project: linux
File: xfs_super.c

xfs_blkdev_put(
	struct block_device	*bdev)
{
	if (bdev)
		blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
}

Project: linux
File: xfs_super.c

xfs_fs_mount(
	struct file_system_type	*fs_type,
	int			flags,
	const char		*dev_name,
	void			*data)
{
	return mount_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
}

Project: linux
File: xfs_super.c

xfs_max_file_offset(
	unsigned int		blockshift)
{
	unsigned int		pagefactor = 1;
	unsigned int		bitshift = BITS_PER_LONG - 1;

	/* Figure out maximum filesize, on Linux this can depend on
	 * the filesystem blocksize (on 32 bit platforms).
	 * __block_write_begin does this in an [unsigned] long...
	 *      page->index << (PAGE_SHIFT - bbits)
	 * So, for page sized blocks (4K on 32 bit platforms),
	 * this wraps at around 8Tb (hence MAX_LFS_FILESIZE which is
	 *      (((u64)PAGE_SIZE << (BITS_PER_LONG-1))-1)
	 * but for smaller blocksizes it is less (bbits = log2 bsize).
	 * Note1: get_block_t takes a long (implicit cast from above)
	 * Note2: The Large Block Device (LBD and HAVE_SECTOR_T) patch
	 * can optionally convert the [unsigned] long from above into
	 * an [unsigned] long long.
	 */

#if BITS_PER_LONG == 32
# if defined(CONFIG_LBDAF)
	ASSERT(sizeof(sector_t) == 8);
	pagefactor = PAGE_SIZE;
	bitshift = BITS_PER_LONG;
# else
	pagefactor = PAGE_SIZE >> (PAGE_SHIFT - blockshift);
# endif
#endif

	return (((uint64_t)pagefactor) << bitshift) - 1;
}

Project: linux
File: xfs_super.c

xfs_fs_fill_super(
	struct super_block	*sb,
	void			*data,
	int			silent)
{
	struct inode		*root;
	struct xfs_mount	*mp = NULL;
	int			flags = 0, error = -ENOMEM;

	/*
	 * allocate mp and do all low-level struct initializations before we
	 * attach it to the super
	 */
	mp = xfs_mount_alloc(sb);
	if (!mp)
		goto out;
	sb->s_fs_info = mp;

	error = xfs_parseargs(mp, (char *)data);
	if (error)
		goto out_free_fsname;

	sb_min_blocksize(sb, BBSIZE);
	sb->s_xattr = xfs_xattr_handlers;
	sb->s_export_op = &xfs_export_operations;
#ifdef CONFIG_XFS_QUOTA
	sb->s_qcop = &xfs_quotactl_operations;
	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
#endif
	sb->s_op = &xfs_super_operations;

	/*
	 * Delay mount work if the debug hook is set. This is debug
	 * instrumention to coordinate simulation of xfs mount failures with
	 * VFS superblock operations
	 */
	if (xfs_globals.mount_delay) {
		xfs_notice(mp, "Delaying mount for %d seconds.",
			xfs_globals.mount_delay);
		msleep(xfs_globals.mount_delay * 1000);
	}

	if (silent)
		flags |= XFS_MFSI_QUIET;

	error = xfs_open_devices(mp);
	if (error)
		goto out_free_fsname;

	error = xfs_init_mount_workqueues(mp);
	if (error)
		goto out_close_devices;

	error = xfs_init_percpu_counters(mp);
	if (error)
		goto out_destroy_workqueues;

	/* Allocate stats memory before we do operations that might use it */
	mp->m_stats.xs_stats = alloc_percpu(struct xfsstats);
	if (!mp->m_stats.xs_stats) {
		error = -ENOMEM;
		goto out_destroy_counters;
	}

	error = xfs_readsb(mp, flags);
	if (error)
		goto out_free_stats;

	error = xfs_finish_flags(mp);
	if (error)
		goto out_free_sb;

	error = xfs_setup_devices(mp);
	if (error)
		goto out_free_sb;

	error = xfs_filestream_mount(mp);
	if (error)
		goto out_free_sb;

	/*
	 * we must configure the block size in the superblock before we run the
	 * full mount process as the mount process can lookup and cache inodes.
	 */
	sb->s_magic = XFS_SB_MAGIC;
	sb->s_blocksize = mp->m_sb.sb_blocksize;
	sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
	sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
	sb->s_max_links = XFS_MAXLINK;
	sb->s_time_gran = 1;
	set_posix_acl_flag(sb);

	/* version 5 superblocks support inode version counters. */
	if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5)
		sb->s_flags |= SB_I_VERSION;

	if (mp->m_flags & XFS_MOUNT_DAX) {
		xfs_warn(mp,
		"DAX enabled. Warning: EXPERIMENTAL, use at your own risk");

		error = bdev_dax_supported(sb, sb->s_blocksize);
		if (error) {
			xfs_alert(mp,
			"DAX unsupported by block device. Turning off DAX.");
			mp->m_flags &= ~XFS_MOUNT_DAX;
		}
		if (xfs_sb_version_hasreflink(&mp->m_sb)) {
			xfs_alert(mp,
		"DAX and reflink cannot be used together!");
			error = -EINVAL;
			goto out_filestream_unmount;
		}
	}

	if (mp->m_flags & XFS_MOUNT_DISCARD) {
		struct request_queue *q = bdev_get_queue(sb->s_bdev);

		if (!blk_queue_discard(q)) {
			xfs_warn(mp, "mounting with \"discard\" option, but "
					"the device does not support discard");
			mp->m_flags &= ~XFS_MOUNT_DISCARD;
		}
	}

	if (xfs_sb_version_hasreflink(&mp->m_sb) && mp->m_sb.sb_rblocks) {
		xfs_alert(mp,
	"reflink not compatible with realtime device!");
		error = -EINVAL;
		goto out_filestream_unmount;
	}

	if (xfs_sb_version_hasrmapbt(&mp->m_sb) && mp->m_sb.sb_rblocks) {
		xfs_alert(mp,
	"reverse mapping btree not compatible with realtime device!");
		error = -EINVAL;
		goto out_filestream_unmount;
	}

	error = xfs_mountfs(mp);
	if (error)
		goto out_filestream_unmount;

	root = igrab(VFS_I(mp->m_rootip));
	if (!root) {
		error = -ENOENT;
		goto out_unmount;
	}
	sb->s_root = d_make_root(root);
	if (!sb->s_root) {
		error = -ENOMEM;
		goto out_unmount;
	}

	return 0;

 out_filestream_unmount:
	xfs_filestream_unmount(mp);
 out_free_sb:
	xfs_freesb(mp);
 out_free_stats:
	free_percpu(mp->m_stats.xs_stats);
 out_destroy_counters:
	xfs_destroy_percpu_counters(mp);
 out_destroy_workqueues:
	xfs_destroy_mount_workqueues(mp);
 out_close_devices:
	xfs_close_devices(mp);
 out_free_fsname:
	sb->s_fs_info = NULL;
	xfs_free_fsname(mp);
	kfree(mp);
 out:
	return error;

 out_unmount:
	xfs_filestream_unmount(mp);
	xfs_unmountfs(mp);
	goto out_free_sb;
}

Project: linux
File: xfs_super.c

xfs_set_inode_alloc(
	struct xfs_mount *mp,
	xfs_agnumber_t	agcount)
{
	xfs_agnumber_t	index;
	xfs_agnumber_t	maxagi = 0;
	xfs_sb_t	*sbp = &mp->m_sb;
	xfs_agnumber_t	max_metadata;
	xfs_agino_t	agino;
	xfs_ino_t	ino;

	/*
	 * Calculate how much should be reserved for inodes to meet
	 * the max inode percentage.  Used only for inode32.
	 */
	if (mp->m_maxicount) {
		uint64_t	icount;

		icount = sbp->sb_dblocks * sbp->sb_imax_pct;
		do_div(icount, 100);
		icount += sbp->sb_agblocks - 1;
		do_div(icount, sbp->sb_agblocks);
		max_metadata = icount;
	} else {
		max_metadata = agcount;
	}

	/* Get the last possible inode in the filesystem */
	agino =	XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
	ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);

	/*
	 * If user asked for no more than 32-bit inodes, and the fs is
	 * sufficiently large, set XFS_MOUNT_32BITINODES if we must alter
	 * the allocator to accommodate the request.
	 */
	if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32)
		mp->m_flags |= XFS_MOUNT_32BITINODES;
	else
		mp->m_flags &= ~XFS_MOUNT_32BITINODES;

	for (index = 0; index < agcount; index++) {
		struct xfs_perag	*pag;

		ino = XFS_AGINO_TO_INO(mp, index, agino);

		pag = xfs_perag_get(mp, index);

		if (mp->m_flags & XFS_MOUNT_32BITINODES) {
			if (ino > XFS_MAXINUMBER_32) {
				pag->pagi_inodeok = 0;
				pag->pagf_metadata = 0;
			} else {
				pag->pagi_inodeok = 1;
				maxagi++;
				if (index < max_metadata)
					pag->pagf_metadata = 1;
				else
					pag->pagf_metadata = 0;
			}
		} else {
			pag->pagi_inodeok = 1;
			pag->pagf_metadata = 0;
		}

		xfs_perag_put(pag);
	}

	return (mp->m_flags & XFS_MOUNT_32BITINODES) ? maxagi : agcount;
}

Project: linux
File: xfs_super.c

xfs_parseargs(
	struct xfs_mount	*mp,
	char			*options)
{
	const struct super_block *sb = mp->m_super;
	char			*p;
	substring_t		args[MAX_OPT_ARGS];
	int			dsunit = 0;
	int			dswidth = 0;
	int			iosize = 0;
	uint8_t			iosizelog = 0;

	/*
	 * set up the mount name first so all the errors will refer to the
	 * correct device.
	 */
	mp->m_fsname = kstrndup(sb->s_id, MAXNAMELEN, GFP_KERNEL);
	if (!mp->m_fsname)
		return -ENOMEM;
	mp->m_fsname_len = strlen(mp->m_fsname) + 1;

	/*
	 * Copy binary VFS mount flags we are interested in.
	 */
	if (sb_rdonly(sb))
		mp->m_flags |= XFS_MOUNT_RDONLY;
	if (sb->s_flags & SB_DIRSYNC)
		mp->m_flags |= XFS_MOUNT_DIRSYNC;
	if (sb->s_flags & SB_SYNCHRONOUS)
		mp->m_flags |= XFS_MOUNT_WSYNC;

	/*
	 * Set some default flags that could be cleared by the mount option
	 * parsing.
	 */
	mp->m_flags |= XFS_MOUNT_BARRIER;
	mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;

	/*
	 * These can be overridden by the mount option parsing.
	 */
	mp->m_logbufs = -1;
	mp->m_logbsize = -1;

	if (!options)
		goto done;

	while ((p = strsep(&options, ",")) != NULL) {
		int		token;

		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_logbufs:
			if (match_int(args, &mp->m_logbufs))
				return -EINVAL;
			break;
		case Opt_logbsize:
			if (suffix_kstrtoint(args, 10, &mp->m_logbsize))
				return -EINVAL;
			break;
		case Opt_logdev:
			kfree(mp->m_logname);
			mp->m_logname = match_strdup(args);
			if (!mp->m_logname)
				return -ENOMEM;
			break;
		case Opt_mtpt:
			xfs_warn(mp, "%s option not allowed on this system", p);
			return -EINVAL;
		case Opt_rtdev:
			kfree(mp->m_rtname);
			mp->m_rtname = match_strdup(args);
			if (!mp->m_rtname)
				return -ENOMEM;
			break;
		case Opt_allocsize:
		case Opt_biosize:
			if (suffix_kstrtoint(args, 10, &iosize))
				return -EINVAL;
			iosizelog = ffs(iosize) - 1;
			break;
		case Opt_grpid:
		case Opt_bsdgroups:
			mp->m_flags |= XFS_MOUNT_GRPID;
			break;
		case Opt_nogrpid:
		case Opt_sysvgroups:
			mp->m_flags &= ~XFS_MOUNT_GRPID;
			break;
		case Opt_wsync:
			mp->m_flags |= XFS_MOUNT_WSYNC;
			break;
		case Opt_norecovery:
			mp->m_flags |= XFS_MOUNT_NORECOVERY;
			break;
		case Opt_noalign:
			mp->m_flags |= XFS_MOUNT_NOALIGN;
			break;
		case Opt_swalloc:
			mp->m_flags |= XFS_MOUNT_SWALLOC;
			break;
		case Opt_sunit:
			if (match_int(args, &dsunit))
				return -EINVAL;
			break;
		case Opt_swidth:
			if (match_int(args, &dswidth))
				return -EINVAL;
			break;
		case Opt_inode32:
			mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
			break;
		case Opt_inode64:
			mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
			break;
		case Opt_nouuid:
			mp->m_flags |= XFS_MOUNT_NOUUID;
			break;
		case Opt_ikeep:
			mp->m_flags |= XFS_MOUNT_IKEEP;
			break;
		case Opt_noikeep:
			mp->m_flags &= ~XFS_MOUNT_IKEEP;
			break;
		case Opt_largeio:
			mp->m_flags &= ~XFS_MOUNT_COMPAT_IOSIZE;
			break;
		case Opt_nolargeio:
			mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
			break;
		case Opt_attr2:
			mp->m_flags |= XFS_MOUNT_ATTR2;
			break;
		case Opt_noattr2:
			mp->m_flags &= ~XFS_MOUNT_ATTR2;
			mp->m_flags |= XFS_MOUNT_NOATTR2;
			break;
		case Opt_filestreams:
			mp->m_flags |= XFS_MOUNT_FILESTREAMS;
			break;
		case Opt_noquota:
			mp->m_qflags &= ~XFS_ALL_QUOTA_ACCT;
			mp->m_qflags &= ~XFS_ALL_QUOTA_ENFD;
			mp->m_qflags &= ~XFS_ALL_QUOTA_ACTIVE;
			break;
		case Opt_quota:
		case Opt_uquota:
		case Opt_usrquota:
			mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE |
					 XFS_UQUOTA_ENFD);
			break;
		case Opt_qnoenforce:
		case Opt_uqnoenforce:
			mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
			mp->m_qflags &= ~XFS_UQUOTA_ENFD;
			break;
		case Opt_pquota:
		case Opt_prjquota:
			mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE |
					 XFS_PQUOTA_ENFD);
			break;
		case Opt_pqnoenforce:
			mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
			mp->m_qflags &= ~XFS_PQUOTA_ENFD;
			break;
		case Opt_gquota:
		case Opt_grpquota:
			mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE |
					 XFS_GQUOTA_ENFD);
			break;
		case Opt_gqnoenforce:
			mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
			mp->m_qflags &= ~XFS_GQUOTA_ENFD;
			break;
		case Opt_discard:
			mp->m_flags |= XFS_MOUNT_DISCARD;
			break;
		case Opt_nodiscard:
			mp->m_flags &= ~XFS_MOUNT_DISCARD;
			break;
#ifdef CONFIG_FS_DAX
		case Opt_dax:
			mp->m_flags |= XFS_MOUNT_DAX;
			break;
#endif
		case Opt_barrier:
			xfs_warn(mp, "%s option is deprecated, ignoring.", p);
			mp->m_flags |= XFS_MOUNT_BARRIER;
			break;
		case Opt_nobarrier:
			xfs_warn(mp, "%s option is deprecated, ignoring.", p);
			mp->m_flags &= ~XFS_MOUNT_BARRIER;
			break;
		default:
			xfs_warn(mp, "unknown mount option [%s].", p);
			return -EINVAL;
		}
	}

	/*
	 * no recovery flag requires a read-only mount
	 */
	if ((mp->m_flags & XFS_MOUNT_NORECOVERY) &&
	    !(mp->m_flags & XFS_MOUNT_RDONLY)) {
		xfs_warn(mp, "no-recovery mounts must be read-only.");
		return -EINVAL;
	}

	if ((mp->m_flags & XFS_MOUNT_NOALIGN) && (dsunit || dswidth)) {
		xfs_warn(mp,
	"sunit and swidth options incompatible with the noalign option");
		return -EINVAL;
	}

#ifndef CONFIG_XFS_QUOTA
	if (XFS_IS_QUOTA_RUNNING(mp)) {
		xfs_warn(mp, "quota support not available in this kernel.");
		return -EINVAL;
	}
#endif

	if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
		xfs_warn(mp, "sunit and swidth must be specified together");
		return -EINVAL;
	}

	if (dsunit && (dswidth % dsunit != 0)) {
		xfs_warn(mp,
	"stripe width (%d) must be a multiple of the stripe unit (%d)",
			dswidth, dsunit);
		return -EINVAL;
	}

done:
	if (dsunit && !(mp->m_flags & XFS_MOUNT_NOALIGN)) {
		/*
		 * At this point the superblock has not been read
		 * in, therefore we do not know the block size.
		 * Before the mount call ends we will convert
		 * these to FSBs.
		 */
		mp->m_dalign = dsunit;
		mp->m_swidth = dswidth;
	}

	if (mp->m_logbufs != -1 &&
	    mp->m_logbufs != 0 &&
	    (mp->m_logbufs < XLOG_MIN_ICLOGS ||
	     mp->m_logbufs > XLOG_MAX_ICLOGS)) {
		xfs_warn(mp, "invalid logbufs value: %d [not %d-%d]",
			mp->m_logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
		return -EINVAL;
	}
	if (mp->m_logbsize != -1 &&
	    mp->m_logbsize !=  0 &&
	    (mp->m_logbsize < XLOG_MIN_RECORD_BSIZE ||
	     mp->m_logbsize > XLOG_MAX_RECORD_BSIZE ||
	     !is_power_of_2(mp->m_logbsize))) {
		xfs_warn(mp,
			"invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
			mp->m_logbsize);
		return -EINVAL;
	}

	if (iosizelog) {
		if (iosizelog > XFS_MAX_IO_LOG ||
		    iosizelog < XFS_MIN_IO_LOG) {
			xfs_warn(mp, "invalid log iosize: %d [not %d-%d]",
				iosizelog, XFS_MIN_IO_LOG,
				XFS_MAX_IO_LOG);
			return -EINVAL;
		}

		mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
		mp->m_readio_log = iosizelog;
		mp->m_writeio_log = iosizelog;
	}

	return 0;
}

Project: linux
File: xfs_super.c

xfs_showargs(
	struct xfs_mount	*mp,
	struct seq_file		*m)
{
	static struct proc_xfs_info xfs_info_set[] = {
		/* the few simple ones we can get from the mount struct */
		{ XFS_MOUNT_IKEEP,		",ikeep" },
		{ XFS_MOUNT_WSYNC,		",wsync" },
		{ XFS_MOUNT_NOALIGN,		",noalign" },
		{ XFS_MOUNT_SWALLOC,		",swalloc" },
		{ XFS_MOUNT_NOUUID,		",nouuid" },
		{ XFS_MOUNT_NORECOVERY,		",norecovery" },
		{ XFS_MOUNT_ATTR2,		",attr2" },
		{ XFS_MOUNT_FILESTREAMS,	",filestreams" },
		{ XFS_MOUNT_GRPID,		",grpid" },
		{ XFS_MOUNT_DISCARD,		",discard" },
		{ XFS_MOUNT_SMALL_INUMS,	",inode32" },
		{ XFS_MOUNT_DAX,		",dax" },
		{ 0, NULL }
	};
	static struct proc_xfs_info xfs_info_unset[] = {
		/* the few simple ones we can get from the mount struct */
		{ XFS_MOUNT_COMPAT_IOSIZE,	",largeio" },
		{ XFS_MOUNT_BARRIER,		",nobarrier" },
		{ XFS_MOUNT_SMALL_INUMS,	",inode64" },
		{ 0, NULL }
	};
	struct proc_xfs_info	*xfs_infop;

	for (xfs_infop = xfs_info_set; xfs_infop->flag; xfs_infop++) {
		if (mp->m_flags & xfs_infop->flag)
			seq_puts(m, xfs_infop->str);
	}
	for (xfs_infop = xfs_info_unset; xfs_infop->flag; xfs_infop++) {
		if (!(mp->m_flags & xfs_infop->flag))
			seq_puts(m, xfs_infop->str);
	}

	if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
		seq_printf(m, ",allocsize=%dk",
				(int)(1 << mp->m_writeio_log) >> 10);

	if (mp->m_logbufs > 0)
		seq_printf(m, ",logbufs=%d", mp->m_logbufs);
	if (mp->m_logbsize > 0)
		seq_printf(m, ",logbsize=%dk", mp->m_logbsize >> 10);

	if (mp->m_logname)
		seq_show_option(m, "logdev", mp->m_logname);
	if (mp->m_rtname)
		seq_show_option(m, "rtdev", mp->m_rtname);

	if (mp->m_dalign > 0)
		seq_printf(m, ",sunit=%d",
				(int)XFS_FSB_TO_BB(mp, mp->m_dalign));
	if (mp->m_swidth > 0)
		seq_printf(m, ",swidth=%d",
				(int)XFS_FSB_TO_BB(mp, mp->m_swidth));

	if (mp->m_qflags & (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD))
		seq_puts(m, ",usrquota");
	else if (mp->m_qflags & XFS_UQUOTA_ACCT)
		seq_puts(m, ",uqnoenforce");

	if (mp->m_qflags & XFS_PQUOTA_ACCT) {
		if (mp->m_qflags & XFS_PQUOTA_ENFD)
			seq_puts(m, ",prjquota");
		else
			seq_puts(m, ",pqnoenforce");
	}
	if (mp->m_qflags & XFS_GQUOTA_ACCT) {
		if (mp->m_qflags & XFS_GQUOTA_ENFD)
			seq_puts(m, ",grpquota");
		else
			seq_puts(m, ",gqnoenforce");
	}

	if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
		seq_puts(m, ",noquota");

	return 0;
}

Project: linux
File: xfs_super.c

xfs_fs_drop_inode(
	struct inode		*inode)
{
	struct xfs_inode	*ip = XFS_I(inode);

	/*
	 * If this unlinked inode is in the middle of recovery, don't
	 * drop the inode just yet; log recovery will take care of
	 * that.  See the comment for this inode flag.
	 */
	if (ip->i_flags & XFS_IRECOVERY) {
		ASSERT(ip->i_mount->m_log->l_flags & XLOG_RECOVERY_NEEDED);
		return 0;
	}

	return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE);
}

Project: linux
File: xfs_super.c

suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
{
	int	last, shift_left_factor = 0, _res;
	char	*value;
	int	ret = 0;

	value = match_strdup(s);
	if (!value)
		return -ENOMEM;

	last = strlen(value) - 1;
	if (value[last] == 'K' || value[last] == 'k') {
		shift_left_factor = 10;
		value[last] = '\0';
	}
	if (value[last] == 'M' || value[last] == 'm') {
		shift_left_factor = 20;
		value[last] = '\0';
	}
	if (value[last] == 'G' || value[last] == 'g') {
		shift_left_factor = 30;
		value[last] = '\0';
	}

	if (kstrtoint(value, base, &_res))
		ret = -EINVAL;
	kfree(value);
	*res = _res << shift_left_factor;
	return ret;
}

Project: linux
File: xfs_super.c

xfs_init_mount_workqueues(
	struct xfs_mount	*mp)
{
	mp->m_buf_workqueue = alloc_workqueue("xfs-buf/%s",
			WQ_MEM_RECLAIM|WQ_FREEZABLE, 1, mp->m_fsname);
	if (!mp->m_buf_workqueue)
		goto out;

	mp->m_data_workqueue = alloc_workqueue("xfs-data/%s",
			WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
	if (!mp->m_data_workqueue)
		goto out_destroy_buf;

	mp->m_unwritten_workqueue = alloc_workqueue("xfs-conv/%s",
			WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
	if (!mp->m_unwritten_workqueue)
		goto out_destroy_data_iodone_queue;

	mp->m_cil_workqueue = alloc_workqueue("xfs-cil/%s",
			WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
	if (!mp->m_cil_workqueue)
		goto out_destroy_unwritten;

	mp->m_reclaim_workqueue = alloc_workqueue("xfs-reclaim/%s",
			WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
	if (!mp->m_reclaim_workqueue)
		goto out_destroy_cil;

	mp->m_log_workqueue = alloc_workqueue("xfs-log/%s",
			WQ_MEM_RECLAIM|WQ_FREEZABLE|WQ_HIGHPRI, 0,
			mp->m_fsname);
	if (!mp->m_log_workqueue)
		goto out_destroy_reclaim;

	mp->m_eofblocks_workqueue = alloc_workqueue("xfs-eofblocks/%s",
			WQ_MEM_RECLAIM|WQ_FREEZABLE, 0, mp->m_fsname);
	if (!mp->m_eofblocks_workqueue)
		goto out_destroy_log;

	mp->m_sync_workqueue = alloc_workqueue("xfs-sync/%s", WQ_FREEZABLE, 0,
					       mp->m_fsname);
	if (!mp->m_sync_workqueue)
		goto out_destroy_eofb;

	return 0;

out_destroy_eofb:
	destroy_workqueue(mp->m_eofblocks_workqueue);
out_destroy_log:
	destroy_workqueue(mp->m_log_workqueue);
out_destroy_reclaim:
	destroy_workqueue(mp->m_reclaim_workqueue);
out_destroy_cil:
	destroy_workqueue(mp->m_cil_workqueue);
out_destroy_unwritten:
	destroy_workqueue(mp->m_unwritten_workqueue);
out_destroy_data_iodone_queue:
	destroy_workqueue(mp->m_data_workqueue);
out_destroy_buf:
	destroy_workqueue(mp->m_buf_workqueue);
out:
	return -ENOMEM;
}

Project: linux
File: xfs_super.c

xfs_save_resvblks(struct xfs_mount *mp)
{
	uint64_t resblks = 0;

	mp->m_resblks_save = mp->m_resblks;
	xfs_reserve_blocks(mp, &resblks, NULL);
}

Project: linux
File: xfs_super.c

xfs_fs_unfreeze(
	struct super_block	*sb)
{
	struct xfs_mount	*mp = XFS_M(sb);

	xfs_restore_resvblks(mp);
	xfs_log_work_queue(mp);
	xfs_icache_enable_reclaim(mp);
	return 0;
}

Project: linux
File: xfs_super.c

xfs_mount_alloc(
	struct super_block	*sb)
{
	struct xfs_mount	*mp;

	mp = kzalloc(sizeof(struct xfs_mount), GFP_KERNEL);
	if (!mp)
		return NULL;

	mp->m_super = sb;
	spin_lock_init(&mp->m_sb_lock);
	spin_lock_init(&mp->m_agirotor_lock);
	INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC);
	spin_lock_init(&mp->m_perag_lock);
	mutex_init(&mp->m_growlock);
	atomic_set(&mp->m_active_trans, 0);
	INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
	INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
	INIT_DELAYED_WORK(&mp->m_cowblocks_work, xfs_cowblocks_worker);
	mp->m_kobj.kobject.kset = xfs_kset;
	return mp;
}

Project: linux
File: xfs_super.c

xfs_init_workqueues(void)
{
	/*
	 * The allocation workqueue can be used in memory reclaim situations
	 * (writepage path), and parallelism is only limited by the number of
	 * AGs in all the filesystems mounted. Hence use the default large
	 * max_active value for this workqueue.
	 */
	xfs_alloc_wq = alloc_workqueue("xfsalloc",
			WQ_MEM_RECLAIM|WQ_FREEZABLE, 0);
	if (!xfs_alloc_wq)
		return -ENOMEM;

	xfs_discard_wq = alloc_workqueue("xfsdiscard", WQ_UNBOUND, 0);
	if (!xfs_discard_wq)
		goto out_free_alloc_wq;

	return 0;
out_free_alloc_wq:
	destroy_workqueue(xfs_alloc_wq);
	return -ENOMEM;
}

Project: linux
File: xfs_super.c

xfs_fs_freeze(
	struct super_block	*sb)
{
	struct xfs_mount	*mp = XFS_M(sb);

	xfs_icache_disable_reclaim(mp);
	xfs_save_resvblks(mp);
	xfs_quiesce_attr(mp);
	return xfs_sync_sb(mp, true);
}

Project: linux
File: xfs_super.c

xfs_blkdev_get(
	xfs_mount_t		*mp,
	const char		*name,
	struct block_device	**bdevp)
{
	int			error = 0;

	*bdevp = blkdev_get_by_path(name, FMODE_READ|FMODE_WRITE|FMODE_EXCL,
				    mp);
	if (IS_ERR(*bdevp)) {
		error = PTR_ERR(*bdevp);
		xfs_warn(mp, "Invalid device [%s], error=%d", name, error);
	}

	return error;
}

Project: linux
File: xfs_super.c

xfs_destroy_zones(void)
{
	/*
	 * Make sure all delayed rcu free are flushed before we
	 * destroy caches.
	 */
	rcu_barrier();
	kmem_zone_destroy(xfs_bui_zone);
	kmem_zone_destroy(xfs_bud_zone);
	kmem_zone_destroy(xfs_cui_zone);
	kmem_zone_destroy(xfs_cud_zone);
	kmem_zone_destroy(xfs_rui_zone);
	kmem_zone_destroy(xfs_rud_zone);
	kmem_zone_destroy(xfs_icreate_zone);
	kmem_zone_destroy(xfs_ili_zone);
	kmem_zone_destroy(xfs_inode_zone);
	kmem_zone_destroy(xfs_efi_zone);
	kmem_zone_destroy(xfs_efd_zone);
	kmem_zone_destroy(xfs_buf_item_zone);
	kmem_zone_destroy(xfs_trans_zone);
	kmem_zone_destroy(xfs_ifork_zone);
	kmem_zone_destroy(xfs_da_state_zone);
	kmem_zone_destroy(xfs_btree_cur_zone);
	kmem_zone_destroy(xfs_bmap_free_item_zone);
	kmem_zone_destroy(xfs_log_ticket_zone);
	bioset_free(xfs_ioend_bioset);
}

Project: linux
File: xfs_super.c

xfs_fs_nr_cached_objects(
	struct super_block	*sb,
	struct shrink_control	*sc)
{
	/* Paranoia: catch incorrect calls during mount setup or teardown */
	if (WARN_ON_ONCE(!sb->s_fs_info))
		return 0;
	return xfs_reclaim_inodes_count(XFS_M(sb));
}

Project: linux
File: xfs_super.c

xfs_open_devices(
	struct xfs_mount	*mp)
{
	struct block_device	*ddev = mp->m_super->s_bdev;
	struct dax_device	*dax_ddev = fs_dax_get_by_bdev(ddev);
	struct dax_device	*dax_logdev = NULL, *dax_rtdev = NULL;
	struct block_device	*logdev = NULL, *rtdev = NULL;
	int			error;

	/*
	 * Open real time and log devices - order is important.
	 */
	if (mp->m_logname) {
		error = xfs_blkdev_get(mp, mp->m_logname, &logdev);
		if (error)
			goto out;
		dax_logdev = fs_dax_get_by_bdev(logdev);
	}

	if (mp->m_rtname) {
		error = xfs_blkdev_get(mp, mp->m_rtname, &rtdev);
		if (error)
			goto out_close_logdev;

		if (rtdev == ddev || rtdev == logdev) {
			xfs_warn(mp,
	"Cannot mount filesystem with identical rtdev and ddev/logdev.");
			error = -EINVAL;
			goto out_close_rtdev;
		}
		dax_rtdev = fs_dax_get_by_bdev(rtdev);
	}

	/*
	 * Setup xfs_mount buffer target pointers
	 */
	error = -ENOMEM;
	mp->m_ddev_targp = xfs_alloc_buftarg(mp, ddev, dax_ddev);
	if (!mp->m_ddev_targp)
		goto out_close_rtdev;

	if (rtdev) {
		mp->m_rtdev_targp = xfs_alloc_buftarg(mp, rtdev, dax_rtdev);
		if (!mp->m_rtdev_targp)
			goto out_free_ddev_targ;
	}

	if (logdev && logdev != ddev) {
		mp->m_logdev_targp = xfs_alloc_buftarg(mp, logdev, dax_logdev);
		if (!mp->m_logdev_targp)
			goto out_free_rtdev_targ;
	} else {
		mp->m_logdev_targp = mp->m_ddev_targp;
	}

	return 0;

 out_free_rtdev_targ:
	if (mp->m_rtdev_targp)
		xfs_free_buftarg(mp->m_rtdev_targp);
 out_free_ddev_targ:
	xfs_free_buftarg(mp->m_ddev_targp);
 out_close_rtdev:
	xfs_blkdev_put(rtdev);
	fs_put_dax(dax_rtdev);
 out_close_logdev:
	if (logdev && logdev != ddev) {
		xfs_blkdev_put(logdev);
		fs_put_dax(dax_logdev);
	}
 out:
	fs_put_dax(dax_ddev);
	return error;
}

Project: linux
File: xfs_super.c

xfs_destroy_mount_workqueues(
	struct xfs_mount	*mp)
{
	destroy_workqueue(mp->m_sync_workqueue);
	destroy_workqueue(mp->m_eofblocks_workqueue);
	destroy_workqueue(mp->m_log_workqueue);
	destroy_workqueue(mp->m_reclaim_workqueue);
	destroy_workqueue(mp->m_cil_workqueue);
	destroy_workqueue(mp->m_data_workqueue);
	destroy_workqueue(mp->m_unwritten_workqueue);
	destroy_workqueue(mp->m_buf_workqueue);
}

Project: linux
File: xfs_super.c

xfs_flush_inodes(
	struct xfs_mount	*mp)
{
	struct super_block	*sb = mp->m_super;

	if (down_read_trylock(&sb->s_umount)) {
		sync_inodes_sb(sb);
		up_read(&sb->s_umount);
	}
}

Project: linux
File: xfs_super.c

xfs_restore_resvblks(struct xfs_mount *mp)
{
	uint64_t resblks;

	if (mp->m_resblks_save) {
		resblks = mp->m_resblks_save;
		mp->m_resblks_save = 0;
	} else
		resblks = xfs_default_resblks(mp);

	xfs_reserve_blocks(mp, &resblks, NULL);
}

Project: linux
File: xfs_super.c

xfs_free_fsname(
	struct xfs_mount	*mp)
{
	kfree(mp->m_fsname);
	kfree(mp->m_rtname);
	kfree(mp->m_logname);
}

Project: linux
File: xfs_super.c

xfs_reinit_percpu_counters(
	struct xfs_mount	*mp)
{
	percpu_counter_set(&mp->m_icount, mp->m_sb.sb_icount);
	percpu_counter_set(&mp->m_ifree, mp->m_sb.sb_ifree);
	percpu_counter_set(&mp->m_fdblocks, mp->m_sb.sb_fdblocks);
}

Project: linux
File: xfs_super.c

xfs_fs_put_super(
	struct super_block	*sb)
{
	struct xfs_mount	*mp = XFS_M(sb);

	/* if ->fill_super failed, we have no mount to tear down */
	if (!sb->s_fs_info)
		return;

	xfs_notice(mp, "Unmounting Filesystem");
	xfs_filestream_unmount(mp);
	xfs_unmountfs(mp);

	xfs_freesb(mp);
	free_percpu(mp->m_stats.xs_stats);
	xfs_destroy_percpu_counters(mp);
	xfs_destroy_mount_workqueues(mp);
	xfs_close_devices(mp);

	sb->s_fs_info = NULL;
	xfs_free_fsname(mp);
	kfree(mp);
}

Project: linux
File: xfs_super.c

xfs_fs_inode_init_once(
	void			*inode)
{
	struct xfs_inode	*ip = inode;

	memset(ip, 0, sizeof(struct xfs_inode));

	/* vfs inode */
	inode_init_once(VFS_I(ip));

	/* xfs inode */
	atomic_set(&ip->i_pincount, 0);
	spin_lock_init(&ip->i_flags_lock);

	mrlock_init(&ip->i_mmaplock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
		     "xfsino", ip->i_ino);
	mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
		     "xfsino", ip->i_ino);
}

Project: linux
File: xfs_super.c

xfs_close_devices(
	struct xfs_mount	*mp)
{
	struct dax_device *dax_ddev = mp->m_ddev_targp->bt_daxdev;

	if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
		struct block_device *logdev = mp->m_logdev_targp->bt_bdev;
		struct dax_device *dax_logdev = mp->m_logdev_targp->bt_daxdev;

		xfs_free_buftarg(mp->m_logdev_targp);
		xfs_blkdev_put(logdev);
		fs_put_dax(dax_logdev);
	}
	if (mp->m_rtdev_targp) {
		struct block_device *rtdev = mp->m_rtdev_targp->bt_bdev;
		struct dax_device *dax_rtdev = mp->m_rtdev_targp->bt_daxdev;

		xfs_free_buftarg(mp->m_rtdev_targp);
		xfs_blkdev_put(rtdev);
		fs_put_dax(dax_rtdev);
	}
	xfs_free_buftarg(mp->m_ddev_targp);
	fs_put_dax(dax_ddev);
}

Project: linux
File: xfs_super.c

xfs_destroy_workqueues(void)
{
	destroy_workqueue(xfs_discard_wq);
	destroy_workqueue(xfs_alloc_wq);
}

Project: linux
File: xfs_super.c

xfs_fs_dirty_inode(
	struct inode			*inode,
	int				flag)
{
	struct xfs_inode		*ip = XFS_I(inode);
	struct xfs_mount		*mp = ip->i_mount;
	struct xfs_trans		*tp;

	if (!(inode->i_sb->s_flags & SB_LAZYTIME))
		return;
	if (flag != I_DIRTY_SYNC || !(inode->i_state & I_DIRTY_TIME))
		return;

	if (xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp))
		return;
	xfs_ilock(ip, XFS_ILOCK_EXCL);
	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
	xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
	xfs_trans_commit(tp);
}

Project: linux
File: xfs_super.c

xfs_test_remount_options(
	struct super_block	*sb,
	char			*options)
{
	int			error = 0;
	struct xfs_mount	*tmp_mp;

	tmp_mp = kmem_zalloc(sizeof(*tmp_mp), KM_MAYFAIL);
	if (!tmp_mp)
		return -ENOMEM;

	tmp_mp->m_super = sb;
	error = xfs_parseargs(tmp_mp, options);
	xfs_free_fsname(tmp_mp);
	kmem_free(tmp_mp);

	return error;
}

Project: linux
File: xfs_super.c

xfs_init_percpu_counters(
	struct xfs_mount	*mp)
{
	int		error;

	error = percpu_counter_init(&mp->m_icount, 0, GFP_KERNEL);
	if (error)
		return -ENOMEM;

	error = percpu_counter_init(&mp->m_ifree, 0, GFP_KERNEL);
	if (error)
		goto free_icount;

	error = percpu_counter_init(&mp->m_fdblocks, 0, GFP_KERNEL);
	if (error)
		goto free_ifree;

	return 0;

free_ifree:
	percpu_counter_destroy(&mp->m_ifree);
free_icount:
	percpu_counter_destroy(&mp->m_icount);
	return -ENOMEM;
}

Project: linux
File: xfs_super.c

xfs_fs_destroy_inode(
	struct inode		*inode)
{
	struct xfs_inode	*ip = XFS_I(inode);

	trace_xfs_destroy_inode(ip);

	ASSERT(!rwsem_is_locked(&inode->i_rwsem));
	XFS_STATS_INC(ip->i_mount, vn_rele);
	XFS_STATS_INC(ip->i_mount, vn_remove);

	xfs_inactive(ip);

	ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);
	XFS_STATS_INC(ip->i_mount, vn_reclaim);

	/*
	 * We should never get here with one of the reclaim flags already set.
	 */
	ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
	ASSERT_ALWAYS(!xfs_iflags_test(ip, XFS_IRECLAIM));

	/*
	 * We always use background reclaim here because even if the
	 * inode is clean, it still may be under IO and hence we have
	 * to take the flush lock. The background reclaim path handles
	 * this more efficiently than we can here, so simply let background
	 * reclaim tear down all inodes.
	 */
	xfs_inode_set_reclaim_tag(ip);
}

Project: linux
File: xfs_super.c

xfs_destroy_percpu_counters(
	struct xfs_mount	*mp)
{
	percpu_counter_destroy(&mp->m_icount);
	percpu_counter_destroy(&mp->m_ifree);
	percpu_counter_destroy(&mp->m_fdblocks);
}

Project: linux
File: xfs_super.c

xfs_fs_alloc_inode(
	struct super_block	*sb)
{
	BUG();
	return NULL;
}

Project: linux
File: xfs_super.c

xfs_quiesce_attr(
	struct xfs_mount	*mp)
{
	int	error = 0;

	/* wait for all modifications to complete */
	while (atomic_read(&mp->m_active_trans) > 0)
		delay(100);

	/* force the log to unpin objects from the now complete transactions */
	xfs_log_force(mp, XFS_LOG_SYNC);

	/* reclaim inodes to do any IO before the freeze completes */
	xfs_reclaim_inodes(mp, 0);
	xfs_reclaim_inodes(mp, SYNC_WAIT);

	/* Push the superblock and write an unmount record */
	error = xfs_log_sbcount(mp);
	if (error)
		xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. "
				"Frozen image may not be consistent.");
	/*
	 * Just warn here till VFS can correctly support
	 * read-only remount without racing.
	 */
	WARN_ON(atomic_read(&mp->m_active_trans) != 0);

	xfs_log_quiesce(mp);
}

Project: linux
File: xfs_super.c

xfs_fs_show_options(
	struct seq_file		*m,
	struct dentry		*root)
{
	return xfs_showargs(XFS_M(root->d_sb), m);
}

Project: linux
File: xfs_super.c

xfs_fs_free_cached_objects(
	struct super_block	*sb,
	struct shrink_control	*sc)
{
	return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
}

Project: linux
File: xfs_super.c

xfs_fs_statfs(
	struct dentry		*dentry,
	struct kstatfs		*statp)
{
	struct xfs_mount	*mp = XFS_M(dentry->d_sb);
	xfs_sb_t		*sbp = &mp->m_sb;
	struct xfs_inode	*ip = XFS_I(d_inode(dentry));
	uint64_t		fakeinos, id;
	uint64_t		icount;
	uint64_t		ifree;
	uint64_t		fdblocks;
	xfs_extlen_t		lsize;
	int64_t			ffree;

	statp->f_type = XFS_SB_MAGIC;
	statp->f_namelen = MAXNAMELEN - 1;

	id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
	statp->f_fsid.val[0] = (u32)id;
	statp->f_fsid.val[1] = (u32)(id >> 32);

	icount = percpu_counter_sum(&mp->m_icount);
	ifree = percpu_counter_sum(&mp->m_ifree);
	fdblocks = percpu_counter_sum(&mp->m_fdblocks);

	spin_lock(&mp->m_sb_lock);
	statp->f_bsize = sbp->sb_blocksize;
	lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;
	statp->f_blocks = sbp->sb_dblocks - lsize;
	spin_unlock(&mp->m_sb_lock);

	statp->f_bfree = fdblocks - mp->m_alloc_set_aside;
	statp->f_bavail = statp->f_bfree;

	fakeinos = statp->f_bfree << sbp->sb_inopblog;
	statp->f_files = MIN(icount + fakeinos, (uint64_t)XFS_MAXINUMBER);
	if (mp->m_maxicount)
		statp->f_files = min_t(typeof(statp->f_files),
					statp->f_files,
					mp->m_maxicount);

	/* If sb_icount overshot maxicount, report actual allocation */
	statp->f_files = max_t(typeof(statp->f_files),
					statp->f_files,
					sbp->sb_icount);

	/* make sure statp->f_ffree does not underflow */
	ffree = statp->f_files - (icount - ifree);
	statp->f_ffree = max_t(int64_t, ffree, 0);


	if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) &&
	    ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
			      (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
		xfs_qm_statvfs(ip, statp);

	if (XFS_IS_REALTIME_MOUNT(mp) &&
	    (ip->i_d.di_flags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
		statp->f_blocks = sbp->sb_rblocks;
		statp->f_bavail = statp->f_bfree =
			sbp->sb_frextents * sbp->sb_rextsize;
	}

	return 0;
}

Project: linux
File: xfs_super.c

init_xfs_fs(void)
{
	int			error;

	xfs_check_ondisk_structs();

	printk(KERN_INFO XFS_VERSION_STRING " with "
			 XFS_BUILD_OPTIONS " enabled\n");

	xfs_extent_free_init_defer_op();
	xfs_rmap_update_init_defer_op();
	xfs_refcount_update_init_defer_op();
	xfs_bmap_update_init_defer_op();

	xfs_dir_startup();

	error = xfs_init_zones();
	if (error)
		goto out;

	error = xfs_init_workqueues();
	if (error)
		goto out_destroy_zones;

	error = xfs_mru_cache_init();
	if (error)
		goto out_destroy_wq;

	error = xfs_buf_init();
	if (error)
		goto out_mru_cache_uninit;

	error = xfs_init_procfs();
	if (error)
		goto out_buf_terminate;

	error = xfs_sysctl_register();
	if (error)
		goto out_cleanup_procfs;

	xfs_kset = kset_create_and_add("xfs", NULL, fs_kobj);
	if (!xfs_kset) {
		error = -ENOMEM;
		goto out_sysctl_unregister;
	}

	xfsstats.xs_kobj.kobject.kset = xfs_kset;

	xfsstats.xs_stats = alloc_percpu(struct xfsstats);
	if (!xfsstats.xs_stats) {
		error = -ENOMEM;
		goto out_kset_unregister;
	}

	error = xfs_sysfs_init(&xfsstats.xs_kobj, &xfs_stats_ktype, NULL,
			       "stats");
	if (error)
		goto out_free_stats;

#ifdef DEBUG
	xfs_dbg_kobj.kobject.kset = xfs_kset;
	error = xfs_sysfs_init(&xfs_dbg_kobj, &xfs_dbg_ktype, NULL, "debug");
	if (error)
		goto out_remove_stats_kobj;
#endif

	error = xfs_qm_init();
	if (error)
		goto out_remove_dbg_kobj;

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

 out_qm_exit:
	xfs_qm_exit();
 out_remove_dbg_kobj:
#ifdef DEBUG
	xfs_sysfs_del(&xfs_dbg_kobj);
 out_remove_stats_kobj:
#endif
	xfs_sysfs_del(&xfsstats.xs_kobj);
 out_free_stats:
	free_percpu(xfsstats.xs_stats);
 out_kset_unregister:
	kset_unregister(xfs_kset);
 out_sysctl_unregister:
	xfs_sysctl_unregister();
 out_cleanup_procfs:
	xfs_cleanup_procfs();
 out_buf_terminate:
	xfs_buf_terminate();
 out_mru_cache_uninit:
	xfs_mru_cache_uninit();
 out_destroy_wq:
	xfs_destroy_workqueues();
 out_destroy_zones:
	xfs_destroy_zones();
 out:
	return error;
}

Project: linux
File: xfs_super.c

xfs_blkdev_issue_flush(
	xfs_buftarg_t		*buftarg)
{
	blkdev_issue_flush(buftarg->bt_bdev, GFP_NOFS, NULL);
}

Project: linux
File: xfs_super.c

xfs_fs_remount(
	struct super_block	*sb,
	int			*flags,
	char			*options)
{
	struct xfs_mount	*mp = XFS_M(sb);
	xfs_sb_t		*sbp = &mp->m_sb;
	substring_t		args[MAX_OPT_ARGS];
	char			*p;
	int			error;

	/* First, check for complete junk; i.e. invalid options */
	error = xfs_test_remount_options(sb, options);
	if (error)
		return error;

	sync_filesystem(sb);
	while ((p = strsep(&options, ",")) != NULL) {
		int token;

		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_barrier:
			xfs_warn(mp, "%s option is deprecated, ignoring.", p);
			mp->m_flags |= XFS_MOUNT_BARRIER;
			break;
		case Opt_nobarrier:
			xfs_warn(mp, "%s option is deprecated, ignoring.", p);
			mp->m_flags &= ~XFS_MOUNT_BARRIER;
			break;
		case Opt_inode64:
			mp->m_flags &= ~XFS_MOUNT_SMALL_INUMS;
			mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
			break;
		case Opt_inode32:
			mp->m_flags |= XFS_MOUNT_SMALL_INUMS;
			mp->m_maxagi = xfs_set_inode_alloc(mp, sbp->sb_agcount);
			break;
		default:
			/*
			 * Logically we would return an error here to prevent
			 * users from believing they might have changed
			 * mount options using remount which can't be changed.
			 *
			 * But unfortunately mount(8) adds all options from
			 * mtab and fstab to the mount arguments in some cases
			 * so we can't blindly reject options, but have to
			 * check for each specified option if it actually
			 * differs from the currently set option and only
			 * reject it if that's the case.
			 *
			 * Until that is implemented we return success for
			 * every remount request, and silently ignore all
			 * options that we can't actually change.
			 */
#if 0
			xfs_info(mp,
		"mount option \"%s\" not supported for remount", p);
			return -EINVAL;
#else
			break;
#endif
		}
	}

	/* ro -> rw */
	if ((mp->m_flags & XFS_MOUNT_RDONLY) && !(*flags & SB_RDONLY)) {
		if (mp->m_flags & XFS_MOUNT_NORECOVERY) {
			xfs_warn(mp,
		"ro->rw transition prohibited on norecovery mount");
			return -EINVAL;
		}

		if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5 &&
		    xfs_sb_has_ro_compat_feature(sbp,
					XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) {
			xfs_warn(mp,
"ro->rw transition prohibited on unknown (0x%x) ro-compat filesystem",
				(sbp->sb_features_ro_compat &
					XFS_SB_FEAT_RO_COMPAT_UNKNOWN));
			return -EINVAL;
		}

		mp->m_flags &= ~XFS_MOUNT_RDONLY;

		/*
		 * If this is the first remount to writeable state we
		 * might have some superblock changes to update.
		 */
		if (mp->m_update_sb) {
			error = xfs_sync_sb(mp, false);
			if (error) {
				xfs_warn(mp, "failed to write sb changes");
				return error;
			}
			mp->m_update_sb = false;
		}

		/*
		 * Fill out the reserve pool if it is empty. Use the stashed
		 * value if it is non-zero, otherwise go with the default.
		 */
		xfs_restore_resvblks(mp);
		xfs_log_work_queue(mp);

		/* Recover any CoW blocks that never got remapped. */
		error = xfs_reflink_recover_cow(mp);
		if (error) {
			xfs_err(mp,
	"Error %d recovering leftover CoW allocations.", error);
			xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
			return error;
		}
		xfs_icache_enable_reclaim(mp);

		/* Create the per-AG metadata reservation pool .*/
		error = xfs_fs_reserve_ag_blocks(mp);
		if (error && error != -ENOSPC)
			return error;
	}

	/* rw -> ro */
	if (!(mp->m_flags & XFS_MOUNT_RDONLY) && (*flags & SB_RDONLY)) {
		/*
		 * Cancel background eofb scanning so it cannot race with the
		 * final log force+buftarg wait and deadlock the remount.
		 */
		xfs_icache_disable_reclaim(mp);

		/* Get rid of any leftover CoW reservations... */
		error = xfs_icache_free_cowblocks(mp, NULL);
		if (error) {
			xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
			return error;
		}

		/* Free the per-AG metadata reservation pool. */
		error = xfs_fs_unreserve_ag_blocks(mp);
		if (error) {
			xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
			return error;
		}

		/*
		 * Before we sync the metadata, we need to free up the reserve
		 * block pool so that the used block count in the superblock on
		 * disk is correct at the end of the remount. Stash the current
		 * reserve pool size so that if we get remounted rw, we can
		 * return it to the same size.
		 */
		xfs_save_resvblks(mp);

		xfs_quiesce_attr(mp);
		mp->m_flags |= XFS_MOUNT_RDONLY;
	}

	return 0;
}

Project: linux
File: xfs_super.c

exit_xfs_fs(void)
{
	xfs_qm_exit();
	unregister_filesystem(&xfs_fs_type);
#ifdef DEBUG
	xfs_sysfs_del(&xfs_dbg_kobj);
#endif
	xfs_sysfs_del(&xfsstats.xs_kobj);
	free_percpu(xfsstats.xs_stats);
	kset_unregister(xfs_kset);
	xfs_sysctl_unregister();
	xfs_cleanup_procfs();
	xfs_buf_terminate();
	xfs_mru_cache_uninit();
	xfs_destroy_workqueues();
	xfs_destroy_zones();
	xfs_uuid_table_free();
}

Project: linux
File: xfs_super.c

xfs_init_zones(void)
{
	xfs_ioend_bioset = bioset_create(4 * MAX_BUF_PER_PAGE,
			offsetof(struct xfs_ioend, io_inline_bio),
			BIOSET_NEED_BVECS);
	if (!xfs_ioend_bioset)
		goto out;

	xfs_log_ticket_zone = kmem_zone_init(sizeof(xlog_ticket_t),
						"xfs_log_ticket");
	if (!xfs_log_ticket_zone)
		goto out_free_ioend_bioset;

	xfs_bmap_free_item_zone = kmem_zone_init(
			sizeof(struct xfs_extent_free_item),
			"xfs_bmap_free_item");
	if (!xfs_bmap_free_item_zone)
		goto out_destroy_log_ticket_zone;

	xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t),
						"xfs_btree_cur");
	if (!xfs_btree_cur_zone)
		goto out_destroy_bmap_free_item_zone;

	xfs_da_state_zone = kmem_zone_init(sizeof(xfs_da_state_t),
						"xfs_da_state");
	if (!xfs_da_state_zone)
		goto out_destroy_btree_cur_zone;

	xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
	if (!xfs_ifork_zone)
		goto out_destroy_da_state_zone;

	xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans");
	if (!xfs_trans_zone)
		goto out_destroy_ifork_zone;


	/*
	 * The size of the zone allocated buf log item is the maximum
	 * size possible under XFS.  This wastes a little bit of memory,
	 * but it is much faster.
	 */
	xfs_buf_item_zone = kmem_zone_init(sizeof(struct xfs_buf_log_item),
					   "xfs_buf_item");
	if (!xfs_buf_item_zone)
		goto out_destroy_trans_zone;

	xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) +
			((XFS_EFD_MAX_FAST_EXTENTS - 1) *
				 sizeof(xfs_extent_t))), "xfs_efd_item");
	if (!xfs_efd_zone)
		goto out_destroy_buf_item_zone;

	xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) +
			((XFS_EFI_MAX_FAST_EXTENTS - 1) *
				sizeof(xfs_extent_t))), "xfs_efi_item");
	if (!xfs_efi_zone)
		goto out_destroy_efd_zone;

	xfs_inode_zone =
		kmem_zone_init_flags(sizeof(xfs_inode_t), "xfs_inode",
			KM_ZONE_HWALIGN | KM_ZONE_RECLAIM | KM_ZONE_SPREAD |
			KM_ZONE_ACCOUNT, xfs_fs_inode_init_once);
	if (!xfs_inode_zone)
		goto out_destroy_efi_zone;

	xfs_ili_zone =
		kmem_zone_init_flags(sizeof(xfs_inode_log_item_t), "xfs_ili",
					KM_ZONE_SPREAD, NULL);
	if (!xfs_ili_zone)
		goto out_destroy_inode_zone;
	xfs_icreate_zone = kmem_zone_init(sizeof(struct xfs_icreate_item),
					"xfs_icr");
	if (!xfs_icreate_zone)
		goto out_destroy_ili_zone;

	xfs_rud_zone = kmem_zone_init(sizeof(struct xfs_rud_log_item),
			"xfs_rud_item");
	if (!xfs_rud_zone)
		goto out_destroy_icreate_zone;

	xfs_rui_zone = kmem_zone_init(
			xfs_rui_log_item_sizeof(XFS_RUI_MAX_FAST_EXTENTS),
			"xfs_rui_item");
	if (!xfs_rui_zone)
		goto out_destroy_rud_zone;

	xfs_cud_zone = kmem_zone_init(sizeof(struct xfs_cud_log_item),
			"xfs_cud_item");
	if (!xfs_cud_zone)
		goto out_destroy_rui_zone;

	xfs_cui_zone = kmem_zone_init(
			xfs_cui_log_item_sizeof(XFS_CUI_MAX_FAST_EXTENTS),
			"xfs_cui_item");
	if (!xfs_cui_zone)
		goto out_destroy_cud_zone;

	xfs_bud_zone = kmem_zone_init(sizeof(struct xfs_bud_log_item),
			"xfs_bud_item");
	if (!xfs_bud_zone)
		goto out_destroy_cui_zone;

	xfs_bui_zone = kmem_zone_init(
			xfs_bui_log_item_sizeof(XFS_BUI_MAX_FAST_EXTENTS),
			"xfs_bui_item");
	if (!xfs_bui_zone)
		goto out_destroy_bud_zone;

	return 0;

 out_destroy_bud_zone:
	kmem_zone_destroy(xfs_bud_zone);
 out_destroy_cui_zone:
	kmem_zone_destroy(xfs_cui_zone);
 out_destroy_cud_zone:
	kmem_zone_destroy(xfs_cud_zone);
 out_destroy_rui_zone:
	kmem_zone_destroy(xfs_rui_zone);
 out_destroy_rud_zone:
	kmem_zone_destroy(xfs_rud_zone);
 out_destroy_icreate_zone:
	kmem_zone_destroy(xfs_icreate_zone);
 out_destroy_ili_zone:
	kmem_zone_destroy(xfs_ili_zone);
 out_destroy_inode_zone:
	kmem_zone_destroy(xfs_inode_zone);
 out_destroy_efi_zone:
	kmem_zone_destroy(xfs_efi_zone);
 out_destroy_efd_zone:
	kmem_zone_destroy(xfs_efd_zone);
 out_destroy_buf_item_zone:
	kmem_zone_destroy(xfs_buf_item_zone);
 out_destroy_trans_zone:
	kmem_zone_destroy(xfs_trans_zone);
 out_destroy_ifork_zone:
	kmem_zone_destroy(xfs_ifork_zone);
 out_destroy_da_state_zone:
	kmem_zone_destroy(xfs_da_state_zone);
 out_destroy_btree_cur_zone:
	kmem_zone_destroy(xfs_btree_cur_zone);
 out_destroy_bmap_free_item_zone:
	kmem_zone_destroy(xfs_bmap_free_item_zone);
 out_destroy_log_ticket_zone:
	kmem_zone_destroy(xfs_log_ticket_zone);
 out_free_ioend_bioset:
	bioset_free(xfs_ioend_bioset);
 out:
	return -ENOMEM;
}

Project: linux
File: xfs_super.c

xfs_setup_devices(
	struct xfs_mount	*mp)
{
	int			error;

	error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_sectsize);
	if (error)
		return error;

	if (mp->m_logdev_targp && mp->m_logdev_targp != mp->m_ddev_targp) {
		unsigned int	log_sector_size = BBSIZE;

		if (xfs_sb_version_hassector(&mp->m_sb))
			log_sector_size = mp->m_sb.sb_logsectsize;
		error = xfs_setsize_buftarg(mp->m_logdev_targp,
					    log_sector_size);
		if (error)
			return error;
	}
	if (mp->m_rtdev_targp) {
		error = xfs_setsize_buftarg(mp->m_rtdev_targp,
					    mp->m_sb.sb_sectsize);
		if (error)
			return error;
	}

	return 0;
}