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Allow tools to use direct IO on Linux when reading from the device, if teh device supports it, and if the tools is OK with that (most are).  Mainly for xfs_repair speedups, now that libxfs caches metadata buffers internally.
Merge of master-melb:xfs-cmds:26728a by kenmcd.

/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <xfs/libxfs.h>
#include <sys/stat.h>
#include "init.h"

char *progname = "libxfs";	/* default, changed by each tool */

struct cache *libxfs_icache;	/* global inode cache */
int libxfs_ihash_size;		/* #buckets in icache */

struct cache *libxfs_bcache;	/* global buffer cache */
int libxfs_bhash_size;		/* #buckets in bcache */

static void manage_zones(int);	/* setup global zones */

/*
 * dev_map - map open devices to fd.
 */
#define MAX_DEVS 10	/* arbitary maximum */
int nextfakedev = -1;	/* device number to give to next fake device */
static struct dev_to_fd {
	dev_t	dev;
	int	fd;
} dev_map[MAX_DEVS]={{0}};

/*
 * Checks whether a given device has a mounted, writable
 * filesystem, returns 1 if it does & fatal (just warns
 * if not fatal, but allows us to proceed).
 *
 * Useful to tools which will produce uncertain results
 * if the filesystem is active - repair, check, logprint.
 */
static int
check_isactive(char *name, char *block, int fatal)
{
	struct stat64	st;

	if (stat64(block, &st) < 0)
		return 0;
	if ((st.st_mode & S_IFMT) != S_IFBLK)
		return 0;
	if (platform_check_ismounted(name, block, &st, 0) == 0)
		return 0;
	return platform_check_iswritable(name, block, &st, fatal);
}

/* libxfs_device_to_fd:
 *     lookup a device number in the device map
 *     return the associated fd
 */
int
libxfs_device_to_fd(dev_t device)
{
	int	d;

	for (d = 0; d < MAX_DEVS; d++)
		if (dev_map[d].dev == device)
			return dev_map[d].fd;

	fprintf(stderr, _("%s: %s: device %lld is not open\n"),
		progname, __FUNCTION__, (long long)device);
	exit(1);
	/* NOTREACHED */
}

/* libxfs_device_open:
 *     open a device and return its device number
 */
dev_t
libxfs_device_open(char *path, int creat, int xflags, int setblksize)
{
	dev_t		dev;
	int		fd, d, flags;
	int		readonly, dio, excl;
	struct stat64	statb;

	readonly = (xflags & LIBXFS_ISREADONLY);
	excl = (xflags & LIBXFS_EXCLUSIVELY) && !creat;
	dio = (xflags & LIBXFS_DIRECT) && !creat && platform_direct_blockdev();

retry:
	flags = (readonly ? O_RDONLY : O_RDWR) | \
		(creat ? (O_CREAT|O_TRUNC) : 0) | \
		(dio ? O_DIRECT : 0) | \
		(excl ? O_EXCL : 0);

	if ((fd = open(path, flags, 0666)) < 0) {
		if (errno == EINVAL && --dio == 0)
			goto retry;
		fprintf(stderr, _("%s: cannot open %s: %s\n"),
			progname, path, strerror(errno));
		exit(1);
	}

	if (fstat64(fd, &statb) < 0) {
		fprintf(stderr, _("%s: cannot stat %s: %s\n"),
			progname, path, strerror(errno));
		exit(1);
	}

	if (!readonly && setblksize && (statb.st_mode & S_IFMT) == S_IFBLK) {
		platform_set_blocksize(fd, path, 512);
	}

	/*
	 * Get the device number from the stat buf - unless
	 * we're not opening a real device, in which case
	 * choose a new fake device number.
	 */
	dev = (statb.st_rdev) ? (statb.st_rdev) : (nextfakedev--);

	for (d = 0; d < MAX_DEVS; d++)
		if (dev_map[d].dev == dev) {
			fprintf(stderr, _("%s: device %lld is already open\n"),
			    progname, (long long)dev);
			exit(1);
		}

	for (d = 0; d < MAX_DEVS; d++)
		if (!dev_map[d].dev) {
			dev_map[d].dev = dev;
			dev_map[d].fd = fd;

			return dev;
		}

	fprintf(stderr, _("%s: %s: too many open devices\n"),
		progname, __FUNCTION__);
	exit(1);
	/* NOTREACHED */
}

void
libxfs_device_close(dev_t dev)
{
	int	d;

	for (d = 0; d < MAX_DEVS; d++)
		if (dev_map[d].dev == dev) {
			int	fd;

			fd = dev_map[d].fd;
			dev_map[d].dev = dev_map[d].fd = 0;

			fsync(fd);
			platform_flush_device(fd, dev);
			close(fd);

			return;
		}

	fprintf(stderr, _("%s: %s: device %lld is not open\n"),
			progname, __FUNCTION__, (long long)dev);
	exit(1);
}

static int
check_open(char *path, int flags, char **rawfile, char **blockfile)
{
	int readonly = (flags & LIBXFS_ISREADONLY);
	int inactive = (flags & LIBXFS_ISINACTIVE);
	int dangerously = (flags & LIBXFS_DANGEROUSLY);
	struct stat64	stbuf;

	if (stat64(path, &stbuf) < 0) {
		perror(path);
		return 0;
	}
	if (!(*rawfile = platform_findrawpath(path))) {
		fprintf(stderr, _("%s: "
				  "can't find a character device matching %s\n"),
			progname, path);
		return 0;
	}
	if (!(*blockfile = platform_findblockpath(path))) {
		fprintf(stderr, _("%s: "
				  "can't find a block device matching %s\n"),
			progname, path);
		return 0;
	}
	if (!readonly && !inactive && platform_check_ismounted(path, *blockfile, NULL, 1))
		return 0;
	
	if (inactive && check_isactive(path, *blockfile, ((readonly|dangerously)?1:0)))
		return 0;

	return 1;
}

/*
 * libxfs initialization.
 * Caller gets a 0 on failure (and we print a message), 1 on success.
 */
int
libxfs_init(libxfs_init_t *a)
{
	char		*blockfile;
	char		curdir[MAXPATHLEN];
	char		*dname;
	char		dpath[25];
	int		fd;
	char		*logname;
	char		logpath[25];
	int		needcd;
	char		*rawfile;
	char		*rtname;
	char		rtpath[25];
	int		rval = 0;
	int		flags;

	dpath[0] = logpath[0] = rtpath[0] = '\0';
	dname = a->dname;
	logname = a->logname;
	rtname = a->rtname;
	a->dfd = a->logfd = a->rtfd = -1;
	a->ddev = a->logdev = a->rtdev = 0;
	a->dbsize = a->lbsize = a->rtbsize = 0;
	a->dsize = a->logBBsize = a->logBBstart = a->rtsize = 0;

	(void)getcwd(curdir,MAXPATHLEN);
	needcd = 0;
	fd = -1;
	flags = (a->isreadonly | a->isdirect);

	if (a->volname) {
		if(!check_open(a->volname,flags,&rawfile,&blockfile))
			goto done;
		needcd = 1;
		fd = open(rawfile, O_RDONLY);
#ifdef HAVE_VOLUME_MANAGER
		xlv_getdev_t getdev;
		if (ioctl(fd, DIOCGETVOLDEV, &getdev) < 0)
#else
		if (1)
#endif
		{
			if (a->notvolok) {
				dname = a->dname = a->volname;
				a->volname = NULL;
				goto voldone;
			}
			fprintf(stderr, _("%s: "
				"%s is not a volume device name\n"),
				progname, a->volname);
			if (a->notvolmsg)
				fprintf(stderr, a->notvolmsg, a->volname);
			goto done;
		}
#ifdef HAVE_VOLUME_MANAGER
		if (getdev.data_subvol_dev && dname) {
			fprintf(stderr, _("%s: "
				"%s has a data subvolume, cannot specify %s\n"),
				progname, a->volname, dname);
			goto done;
		}
		if (getdev.log_subvol_dev && logname) {
			fprintf(stderr, _("%s: "
				"%s has a log subvolume, cannot specify %s\n"),
				progname, a->volname, logname);
			goto done;
		}
		if (getdev.rt_subvol_dev && rtname) {
			fprintf(stderr, _("%s: %s has a realtime subvolume, "
				"cannot specify %s\n"),
				progname, a->volname, rtname);
			goto done;
		}
		if (!dname && getdev.data_subvol_dev) {
			strcpy(dpath, "/tmp/libxfsdXXXXXX");
			(void)mktemp(dpath);
			if (mknod(dpath, S_IFCHR | 0600,
				  getdev.data_subvol_dev) < 0) {
				fprintf(stderr, _("%s: mknod failed: %s\n"),
					progname, strerror(errno));
				goto done;
			}
			dname = dpath;
		}
		if (!logname && getdev.log_subvol_dev) {
			strcpy(logpath, "/tmp/libxfslXXXXXX");
			(void)mktemp(logpath);
			if (mknod(logpath, S_IFCHR | 0600,
				  getdev.log_subvol_dev) < 0) {
				fprintf(stderr, _("%s: mknod failed: %s\n"),
					progname, strerror(errno));
				goto done;
			}
			logname = logpath;
		}
		if (!rtname && getdev.rt_subvol_dev) {
			strcpy(rtpath, "/tmp/libxfsrXXXXXX");
			(void)mktemp(rtpath);
			if (mknod(rtpath, S_IFCHR | 0600,
				  getdev.rt_subvol_dev) < 0) {
				fprintf(stderr, _("%s: mknod failed: %s\n"),
					progname, strerror(errno));
				goto done;
			}
			rtname = rtpath;
		}
#endif
	}
voldone:
	if (dname) {
		if (dname[0] != '/' && needcd)
			chdir(curdir);
		if (a->disfile) {
			a->ddev= libxfs_device_open(dname, a->dcreat, flags,
						    a->setblksize);
			a->dfd = libxfs_device_to_fd(a->ddev);
		} else {
			if (!check_open(dname, flags, &rawfile, &blockfile))
				goto done;
			a->ddev = libxfs_device_open(rawfile,
					a->dcreat, flags, a->setblksize);
			a->dfd = libxfs_device_to_fd(a->ddev);
			platform_findsizes(rawfile, a->dfd,
						&a->dsize, &a->dbsize);
		}
		needcd = 1;
	} else
		a->dsize = 0;
	if (logname) {
		if (logname[0] != '/' && needcd)
			chdir(curdir);
		if (a->lisfile) {
			a->logdev = libxfs_device_open(logname,
					a->lcreat, flags, a->setblksize);
			a->logfd = libxfs_device_to_fd(a->logdev);
		} else {
			if (!check_open(logname, flags, &rawfile, &blockfile))
				goto done;
			a->logdev = libxfs_device_open(rawfile,
					a->lcreat, flags, a->setblksize);
			a->logfd = libxfs_device_to_fd(a->logdev);
			platform_findsizes(rawfile, a->logfd,
						&a->logBBsize, &a->lbsize);
		}
		needcd = 1;
	} else
		a->logBBsize = 0;
	if (rtname) {
		if (rtname[0] != '/' && needcd)
			chdir(curdir);
		if (a->risfile) {
			a->rtdev = libxfs_device_open(rtname,
					a->rcreat, flags, a->setblksize);
			a->rtfd = libxfs_device_to_fd(a->rtdev);
		} else {
			if (!check_open(rtname, flags, &rawfile, &blockfile))
				goto done;
			a->rtdev = libxfs_device_open(rawfile,
					a->rcreat, flags, a->setblksize);
			a->rtfd = libxfs_device_to_fd(a->rtdev);
			platform_findsizes(rawfile, a->rtfd,
						&a->rtsize, &a->rtbsize);
		}
		needcd = 1;
	} else
		a->rtsize = 0;
	if (a->dsize < 0) {
		fprintf(stderr, _("%s: can't get size for data subvolume\n"),
			progname);
		goto done;
	}
	if (a->logBBsize < 0) {
		fprintf(stderr, _("%s: can't get size for log subvolume\n"),
			progname);
		goto done;
	}
	if (a->rtsize < 0) {
		fprintf(stderr, _("%s: can't get size for realtime subvolume\n"),
			progname);
		goto done;
	}
	if (needcd)
		chdir(curdir);
	if (!libxfs_ihash_size)
		libxfs_ihash_size = LIBXFS_IHASHSIZE(sbp);
	libxfs_icache = cache_init(libxfs_ihash_size, &libxfs_icache_operations);
	if (!libxfs_bhash_size)
		libxfs_bhash_size = LIBXFS_BHASHSIZE(sbp);
	libxfs_bcache = cache_init(libxfs_bhash_size, &libxfs_bcache_operations);
	manage_zones(0);
	rval = 1;
done:
	if (dpath[0])
		unlink(dpath);
	if (logpath[0])
		unlink(logpath);
	if (rtpath[0])
		unlink(rtpath);
	if (fd >= 0)
		close(fd);
	if (!rval && a->ddev)
		libxfs_device_close(a->ddev);
	if (!rval && a->logdev)
		libxfs_device_close(a->logdev);
	if (!rval && a->rtdev)
		libxfs_device_close(a->rtdev);
	return rval;
}


/*
 * Initialize/destroy all of the zone allocators we use.
 */
static void
manage_zones(int release)
{
	extern xfs_zone_t	*xfs_buf_zone;
	extern xfs_zone_t	*xfs_ili_zone;
	extern xfs_zone_t	*xfs_inode_zone;
	extern xfs_zone_t	*xfs_ifork_zone;
	extern xfs_zone_t	*xfs_dabuf_zone;
	extern xfs_zone_t	*xfs_buf_item_zone;
	extern xfs_zone_t	*xfs_da_state_zone;
	extern xfs_zone_t	*xfs_btree_cur_zone;
	extern xfs_zone_t	*xfs_bmap_free_item_zone;
	extern void		xfs_dir_startup();

	if (release) {	/* free zone allocation */
		libxfs_free(xfs_buf_zone);
		libxfs_free(xfs_inode_zone);
		libxfs_free(xfs_ifork_zone);
		libxfs_free(xfs_dabuf_zone);
		libxfs_free(xfs_buf_item_zone);
		libxfs_free(xfs_da_state_zone);
		libxfs_free(xfs_btree_cur_zone);
		libxfs_free(xfs_bmap_free_item_zone);
		return;
	}
	/* otherwise initialise zone allocation */
	xfs_buf_zone = libxfs_zone_init(sizeof(xfs_buf_t), "xfs_buffer");
	xfs_inode_zone = libxfs_zone_init(sizeof(xfs_inode_t), "xfs_inode");
	xfs_ifork_zone = libxfs_zone_init(sizeof(xfs_ifork_t), "xfs_ifork");
	xfs_dabuf_zone = libxfs_zone_init(sizeof(xfs_dabuf_t), "xfs_dabuf");
	xfs_ili_zone = libxfs_zone_init(
			sizeof(xfs_inode_log_item_t), "xfs_inode_log_item");
	xfs_buf_item_zone = libxfs_zone_init(
			sizeof(xfs_buf_log_item_t), "xfs_buf_log_item");
	xfs_da_state_zone = libxfs_zone_init(
			sizeof(xfs_da_state_t), "xfs_da_state");
	xfs_btree_cur_zone = libxfs_zone_init(
			sizeof(xfs_btree_cur_t), "xfs_btree_cur");
	xfs_bmap_free_item_zone = libxfs_zone_init(
			sizeof(xfs_bmap_free_item_t), "xfs_bmap_free_item");
	xfs_dir_startup();
}

/*
 * Get the bitmap and summary inodes into the mount structure
 * at mount time.
 */
static int
rtmount_inodes(xfs_mount_t *mp)
{
	int		error;
	xfs_sb_t	*sbp;

	sbp = &mp->m_sb;
	if (sbp->sb_rbmino == NULLFSINO)
		return 0;
	error = libxfs_iget(mp, NULL, sbp->sb_rbmino, 0, &mp->m_rbmip, 0);
	if (error) {
		fprintf(stderr,
			_("%s: cannot read realtime bitmap inode (%d)\n"),
			progname, error);
		return error;
	}
	ASSERT(mp->m_rbmip != NULL);
	ASSERT(sbp->sb_rsumino != NULLFSINO);
	error = libxfs_iget(mp, NULL, sbp->sb_rsumino, 0, &mp->m_rsumip, 0);
	if (error) {
		libxfs_iput(mp->m_rbmip, 0);
		fprintf(stderr,
			_("%s: cannot read realtime summary inode (%d)\n"),
			progname, error);
		return error;
	}
	ASSERT(mp->m_rsumip != NULL);
	return 0;
}

/*
 * Initialize realtime fields in the mount structure.
 */
static int
rtmount_init(
	xfs_mount_t	*mp,	/* file system mount structure */
	int		flags)
{
	xfs_buf_t	*bp;	/* buffer for last block of subvolume */
	xfs_daddr_t	d;	/* address of last block of subvolume */
	xfs_sb_t	*sbp;	/* filesystem superblock copy in mount */

	sbp = &mp->m_sb;
	if (sbp->sb_rblocks == 0)
		return 0;
	if (mp->m_rtdev == 0 && !(flags & LIBXFS_MOUNT_DEBUGGER)) {
		fprintf(stderr, _("%s: filesystem has a realtime subvolume\n"),
			progname);
		return -1;
	}
	mp->m_rsumlevels = sbp->sb_rextslog + 1;
	mp->m_rsumsize =
		(uint)sizeof(xfs_suminfo_t) * mp->m_rsumlevels *
		sbp->sb_rbmblocks;
	mp->m_rsumsize = roundup(mp->m_rsumsize, sbp->sb_blocksize);
	mp->m_rbmip = mp->m_rsumip = NULL;

	/*
	 * Allow debugger to be run without the realtime device present.
	 */
	if (flags & LIBXFS_MOUNT_DEBUGGER)
		return 0;

	/*
	 * Check that the realtime section is an ok size.
	 */
	d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks);
	if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_rblocks) {
		fprintf(stderr, _("%s: realtime init - %llu != %llu\n"),
			progname, (unsigned long long) XFS_BB_TO_FSB(mp, d),
			(unsigned long long) mp->m_sb.sb_rblocks);
		return -1;
	}
	bp = libxfs_readbuf(mp->m_rtdev,
			d - XFS_FSB_TO_BB(mp, 1), XFS_FSB_TO_BB(mp, 1), 0);
	if (bp == NULL) {
		fprintf(stderr, _("%s: realtime size check failed\n"),
			progname);
		return -1;
	}
	libxfs_putbuf(bp);
	return 0;
}

/*
 * Mount structure initialization, provides a filled-in xfs_mount_t
 * such that the numerous XFS_* macros can be used.  If dev is zero,
 * no IO will be performed (no size checks, read root inodes).
 */
xfs_mount_t *
libxfs_mount(
	xfs_mount_t	*mp,
	xfs_sb_t	*sb,
	dev_t		dev,
	dev_t		logdev,
	dev_t		rtdev,
	int		flags)
{
	xfs_daddr_t	d;
	xfs_buf_t	*bp;
	xfs_sb_t	*sbp;
	size_t		size;
	int		error;

	mp->m_dev = dev;
	mp->m_rtdev = rtdev;
	mp->m_logdev = logdev;
	mp->m_flags = (LIBXFS_MOUNT_32BITINODES|LIBXFS_MOUNT_32BITINOOPT);
	mp->m_sb = *sb;
	sbp = &(mp->m_sb);

	libxfs_mount_common(mp, sb);

	libxfs_alloc_compute_maxlevels(mp);
	libxfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK);
	libxfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
	libxfs_ialloc_compute_maxlevels(mp);

	if (sbp->sb_imax_pct) {
		/* Make sure the maximum inode count is a multiple of the
		 * units we allocate inodes in.
		 */
		mp->m_maxicount = (sbp->sb_dblocks * sbp->sb_imax_pct) / 100;
		mp->m_maxicount = ((mp->m_maxicount / mp->m_ialloc_blks) *
				  mp->m_ialloc_blks)  << sbp->sb_inopblog;
	} else
		mp->m_maxicount = 0;

	mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE;

	/*
	 * Set whether we're using stripe alignment.
	 */
	if (XFS_SB_VERSION_HASDALIGN(&mp->m_sb)) {
		mp->m_dalign = sbp->sb_unit;
		mp->m_swidth = sbp->sb_width;
	}

	/*
	 * Set whether we're using inode alignment.
	 */
	if (XFS_SB_VERSION_HASALIGN(&mp->m_sb) &&
	    mp->m_sb.sb_inoalignmt >=
	    XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size))
		mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1;
	else
		mp->m_inoalign_mask = 0;
	/*
	 * If we are using stripe alignment, check whether
	 * the stripe unit is a multiple of the inode alignment
	 */
	if (   mp->m_dalign
	    && mp->m_inoalign_mask && !(mp->m_dalign & mp->m_inoalign_mask))
		mp->m_sinoalign = mp->m_dalign;
	else
		mp->m_sinoalign = 0;

	/*
	 * Check that the data (and log if separate) are an ok size.
	 */
	d = (xfs_daddr_t) XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
	if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
		fprintf(stderr, _("%s: size check failed\n"), progname);
		if (!(flags & LIBXFS_MOUNT_DEBUGGER))
			return NULL;
	}

	/* Initialize the appropriate directory manager */
	if (XFS_SB_VERSION_HASDIRV2(sbp))
		libxfs_dir2_mount(mp);
	else
		libxfs_dir_mount(mp);

	/* Initialize cached values for the attribute manager */
	mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100;

	/* Initialize the precomputed transaction reservations values */
	libxfs_trans_init(mp);

	if (dev == 0)	/* maxtrres, we have no device so leave now */
		return mp;

	bp = libxfs_readbuf(mp->m_dev,
			d - XFS_FSS_TO_BB(mp, 1), XFS_FSS_TO_BB(mp, 1),
			!(flags & LIBXFS_MOUNT_DEBUGGER));
	if (!bp) {
		fprintf(stderr, _("%s: data size check failed\n"), progname);
		if (!(flags & LIBXFS_MOUNT_DEBUGGER))
			return NULL;
	}
	libxfs_putbuf(bp);

	if (mp->m_logdev && mp->m_logdev != mp->m_dev) {
		d = (xfs_daddr_t) XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
		if ( (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) ||
		     (!(bp = libxfs_readbuf(mp->m_logdev,
					d - XFS_FSB_TO_BB(mp, 1),
					XFS_FSB_TO_BB(mp, 1),
					!(flags & LIBXFS_MOUNT_DEBUGGER)))) ) {
			fprintf(stderr, _("%s: log size checks failed\n"),
					progname);
			if (!(flags & LIBXFS_MOUNT_DEBUGGER))
				return NULL;
		}
		libxfs_putbuf(bp);
	}

	/* Initialize realtime fields in the mount structure */
	if (rtmount_init(mp, flags)) {
		fprintf(stderr, _("%s: realtime device init failed\n"),
			progname);
			return NULL;
	}

	/* Allocate and initialize the per-ag data */
	size = sbp->sb_agcount * sizeof(xfs_perag_t);
	if (size && (mp->m_perag = calloc(size, 1)) == NULL) {
		fprintf(stderr, _("%s: failed to alloc %ld bytes: %s\n"),
			progname, (long)size, strerror(errno));
		exit(1);
	}

	mp->m_maxagi = libxfs_initialize_perag(mp, sbp->sb_agcount);

	/*
	 * mkfs calls mount before the root inode is allocated.
	 */
	if ((flags & LIBXFS_MOUNT_ROOTINOS) && sbp->sb_rootino != NULLFSINO) {
		error = libxfs_iget(mp, NULL, sbp->sb_rootino, 0,
				&mp->m_rootip, 0);
		if (error) {
			fprintf(stderr, _("%s: cannot read root inode (%d)\n"),
				progname, error);
			if (!(flags & LIBXFS_MOUNT_DEBUGGER))
				return NULL;
		}
		ASSERT(mp->m_rootip != NULL);
	}
	if ((flags & LIBXFS_MOUNT_ROOTINOS) && rtmount_inodes(mp)) {
		libxfs_iput(mp->m_rootip, 0);
		return NULL;
	}
	return mp;
}

void
libxfs_rtmount_destroy(xfs_mount_t *mp)
{
	if (mp->m_rsumip)
		libxfs_iput(mp->m_rsumip, 0);
	if (mp->m_rbmip)
		libxfs_iput(mp->m_rbmip, 0);
	mp->m_rsumip = mp->m_rbmip = NULL;
}

/*
 * Release any resource obtained during a mount.
 */
void
libxfs_umount(xfs_mount_t *mp)
{
	libxfs_rtmount_destroy(mp);
	libxfs_icache_purge();
	libxfs_bcache_purge();

	if (mp->m_perag) {
		int     agno;
		for (agno = 0; agno < mp->m_maxagi; agno++) {
			if (mp->m_perag[agno].pagb_list)
				free(mp->m_perag[agno].pagb_list);
		}
		free(mp->m_perag);
	}
}

/*
 * Release any global resources used by libxfs.
 */
void
libxfs_destroy(void)
{
	manage_zones(1);
	cache_destroy(libxfs_icache);
	cache_destroy(libxfs_bcache);
}

int
libxfs_device_alignment(void)
{
	return platform_align_blockdev();
}

void
libxfs_report(FILE *fp)
{
	time_t t;
	char *c;

	cache_report(fp, "libxfs_icache", libxfs_icache);
	cache_report(fp, "libxfs_bcache", libxfs_bcache);

	t = time(NULL);
	c = asctime(localtime(&t));
	fprintf(fp, "%s", c);
}