Attachment 241856 Details for Bug 271105 – Add more printfs to mount path

Add more printfs to mount path

ext2_vfsops.c (text/plain), 40.51 KB, created by Fedor Uporov on 2023-04-29 15:00:15 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Fedor Uporov

Created: 2023-04-29 15:00:15 UTC

Size: 40.51 KB

patch

obsolete

>/*-
> *  modified for EXT2FS support in Lites 1.1
> *
> *  Aug 1995, Godmar Back (gback@cs.utah.edu)
> *  University of Utah, Department of Computer Science
> */
>/*-
> * SPDX-License-Identifier: BSD-3-Clause
> *
> * Copyright (c) 1989, 1991, 1993, 1994
> *	The Regents of the University of California.  All rights reserved.
> *
> * Redistribution and use in source and binary forms, with or without
> * modification, are permitted provided that the following conditions
> * are met:
> * 1. Redistributions of source code must retain the above copyright
> *    notice, this list of conditions and the following disclaimer.
> * 2. Redistributions in binary form must reproduce the above copyright
> *    notice, this list of conditions and the following disclaimer in the
> *    documentation and/or other materials provided with the distribution.
> * 3. Neither the name of the University nor the names of its contributors
> *    may be used to endorse or promote products derived from this software
> *    without specific prior written permission.
> *
> * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
> * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
> * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
> * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
> * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
> * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
> * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
> * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
> * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
> * SUCH DAMAGE.
> *
> *	@(#)ffs_vfsops.c	8.8 (Berkeley) 4/18/94
> * $FreeBSD$
> */
>
>#include <sys/param.h>
>#include <sys/systm.h>
>#include <sys/namei.h>
>#include <sys/priv.h>
>#include <sys/proc.h>
>#include <sys/kernel.h>
>#include <sys/vnode.h>
>#include <sys/mount.h>
>#include <sys/bio.h>
>#include <sys/buf.h>
>#include <sys/conf.h>
>#include <sys/endian.h>
>#include <sys/fcntl.h>
>#include <sys/malloc.h>
>#include <sys/sdt.h>
>#include <sys/stat.h>
>#include <sys/mutex.h>
>
>#include <geom/geom.h>
>#include <geom/geom_vfs.h>
>
>#include <fs/ext2fs/fs.h>
>#include <fs/ext2fs/ext2_mount.h>
>#include <fs/ext2fs/inode.h>
>
>#include <fs/ext2fs/ext2fs.h>
>#include <fs/ext2fs/ext2_dinode.h>
>#include <fs/ext2fs/ext2_extern.h>
>#include <fs/ext2fs/ext2_extents.h>
>
>SDT_PROVIDER_DECLARE(ext2fs);
>/*
> * ext2fs trace probe:
> * arg0: verbosity. Higher numbers give more verbose messages
> * arg1: Textual message
> */
>SDT_PROBE_DEFINE2(ext2fs, , vfsops, trace, "int", "char*");
>SDT_PROBE_DEFINE2(ext2fs, , vfsops, ext2_cg_validate_error, "char*", "int");
>SDT_PROBE_DEFINE1(ext2fs, , vfsops, ext2_compute_sb_data_error, "char*");
>
>static int	ext2_flushfiles(struct mount *mp, int flags, struct thread *td);
>static int	ext2_mountfs(struct vnode *, struct mount *);
>static int	ext2_reload(struct mount *mp, struct thread *td);
>static int	ext2_sbupdate(struct ext2mount *, int);
>static int	ext2_cgupdate(struct ext2mount *, int);
>static vfs_unmount_t		ext2_unmount;
>static vfs_root_t		ext2_root;
>static vfs_statfs_t		ext2_statfs;
>static vfs_sync_t		ext2_sync;
>static vfs_vget_t		ext2_vget;
>static vfs_fhtovp_t		ext2_fhtovp;
>static vfs_mount_t		ext2_mount;
>
>MALLOC_DEFINE(M_EXT2NODE, "ext2_node", "EXT2 vnode private part");
>static MALLOC_DEFINE(M_EXT2MNT, "ext2_mount", "EXT2 mount structure");
>
>static struct vfsops ext2fs_vfsops = {
>	.vfs_fhtovp =		ext2_fhtovp,
>	.vfs_mount =		ext2_mount,
>	.vfs_root =		ext2_root,	/* root inode via vget */
>	.vfs_statfs =		ext2_statfs,
>	.vfs_sync =		ext2_sync,
>	.vfs_unmount =		ext2_unmount,
>	.vfs_vget =		ext2_vget,
>};
>
>VFS_SET(ext2fs_vfsops, ext2fs, 0);
>
>static int	ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev,
>		    int ronly);
>static int	ext2_compute_sb_data(struct vnode * devvp,
>		    struct ext2fs * es, struct m_ext2fs * fs);
>
>static const char *ext2_opts[] = { "acls", "async", "noatime", "noclusterr", 
>    "noclusterw", "noexec", "export", "force", "from", "multilabel",
>    "suiddir", "nosymfollow", "sync", "union", NULL };
>
>/*
> * VFS Operations.
> *
> * mount system call
> */
>static int
>ext2_mount(struct mount *mp)
>{
>	struct vfsoptlist *opts;
>	struct vnode *devvp;
>	struct thread *td;
>	struct ext2mount *ump = NULL;
>	struct m_ext2fs *fs;
>	struct nameidata nd, *ndp = &nd;
>	accmode_t accmode;
>	char *path, *fspec;
>	int error, flags, len;
>
>	td = curthread;
>	opts = mp->mnt_optnew;
>
>	printf("==== ext2_mount(+)\n");
>
>	if (vfs_filteropt(opts, ext2_opts)) {
>		printf("vfs_filteropt:err=EINVAL\n");
>		return (EINVAL);
>	}
>
>	vfs_getopt(opts, "fspath", (void **)&path, NULL);
>	/* Double-check the length of path.. */
>	if (strlen(path) >= MAXMNTLEN)
>		return (ENAMETOOLONG);
>
>	fspec = NULL;
>	error = vfs_getopt(opts, "from", (void **)&fspec, &len);
>	if (!error && fspec[len - 1] != '\0') {
>		printf("vfs_getopt:err=EINVAL\n");
>		return (EINVAL);
>	}
>
>	/*
>	 * If updating, check whether changing from read-only to
>	 * read/write; if there is no device name, that's all we do.
>	 */
>	if (mp->mnt_flag & MNT_UPDATE) {
>		printf("==== !!! MNT_UPDATE\n");
>		ump = VFSTOEXT2(mp);
>		fs = ump->um_e2fs;
>		error = 0;
>		if (fs->e2fs_ronly == 0 &&
>		    vfs_flagopt(opts, "ro", NULL, 0)) {
>			error = VFS_SYNC(mp, MNT_WAIT);
>			if (error)
>				return (error);
>			flags = WRITECLOSE;
>			if (mp->mnt_flag & MNT_FORCE)
>				flags |= FORCECLOSE;
>			error = ext2_flushfiles(mp, flags, td);
>			if (error == 0 && fs->e2fs_wasvalid &&
>			    ext2_cgupdate(ump, MNT_WAIT) == 0) {
>				fs->e2fs->e2fs_state =
>				    htole16((le16toh(fs->e2fs->e2fs_state) |
>				    E2FS_ISCLEAN));
>				ext2_sbupdate(ump, MNT_WAIT);
>			}
>			fs->e2fs_ronly = 1;
>			vfs_flagopt(opts, "ro", &mp->mnt_flag, MNT_RDONLY);
>			g_topology_lock();
>			g_access(ump->um_cp, 0, -1, 0);
>			g_topology_unlock();
>		}
>		if (!error && (mp->mnt_flag & MNT_RELOAD))
>			error = ext2_reload(mp, td);
>		if (error)
>			return (error);
>		devvp = ump->um_devvp;
>		if (fs->e2fs_ronly && !vfs_flagopt(opts, "ro", NULL, 0)) {
>			if (ext2_check_sb_compat(fs->e2fs, devvp->v_rdev, 0))
>				return (EPERM);
>
>			/*
>			 * If upgrade to read-write by non-root, then verify
>			 * that user has necessary permissions on the device.
>			 */
>			vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
>			error = VOP_ACCESS(devvp, VREAD | VWRITE,
>			    td->td_ucred, td);
>			if (error)
>				error = priv_check(td, PRIV_VFS_MOUNT_PERM);
>			if (error) {
>				VOP_UNLOCK(devvp);
>				return (error);
>			}
>			VOP_UNLOCK(devvp);
>			g_topology_lock();
>			error = g_access(ump->um_cp, 0, 1, 0);
>			g_topology_unlock();
>			if (error)
>				return (error);
>
>			if ((le16toh(fs->e2fs->e2fs_state) & E2FS_ISCLEAN) == 0 ||
>			    (le16toh(fs->e2fs->e2fs_state) & E2FS_ERRORS)) {
>				if (mp->mnt_flag & MNT_FORCE) {
>					printf(
>"WARNING: %s was not properly dismounted\n", fs->e2fs_fsmnt);
>				} else {
>					printf(
>"WARNING: R/W mount of %s denied.  Filesystem is not clean - run fsck\n",
>					    fs->e2fs_fsmnt);
>					return (EPERM);
>				}
>			}
>			fs->e2fs->e2fs_state =
>			    htole16(le16toh(fs->e2fs->e2fs_state) & ~E2FS_ISCLEAN);
>			(void)ext2_cgupdate(ump, MNT_WAIT);
>			fs->e2fs_ronly = 0;
>			MNT_ILOCK(mp);
>			mp->mnt_flag &= ~MNT_RDONLY;
>			MNT_IUNLOCK(mp);
>		}
>		if (vfs_flagopt(opts, "export", NULL, 0)) {
>			/* Process export requests in vfs_mount.c. */
>			return (error);
>		}
>	}
>
>	/*
>	 * Not an update, or updating the name: look up the name
>	 * and verify that it refers to a sensible disk device.
>	 */
>	if (fspec == NULL) {
>		printf("==== (fspec == NULL)\n");
>		return (EINVAL);
>	}
>	NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td);
>	if ((error = namei(ndp)) != 0)
>		return (error);
>	NDFREE(ndp, NDF_ONLY_PNBUF);
>	devvp = ndp->ni_vp;
>
>	if (!vn_isdisk_error(devvp, &error)) {
>		vput(devvp);
>		printf("==== vn_isdisk_error: err=%d\n", error);
>		return (error);
>	}
>
>	/*
>	 * If mount by non-root, then verify that user has necessary
>	 * permissions on the device.
>	 *
>	 * XXXRW: VOP_ACCESS() enough?
>	 */
>	accmode = VREAD;
>	if ((mp->mnt_flag & MNT_RDONLY) == 0)
>		accmode |= VWRITE;
>	error = VOP_ACCESS(devvp, accmode, td->td_ucred, td);
>	if (error)
>		error = priv_check(td, PRIV_VFS_MOUNT_PERM);
>	if (error) {
>		vput(devvp);
>		return (error);
>	}
>
>	if ((mp->mnt_flag & MNT_UPDATE) == 0) {
>		error = ext2_mountfs(devvp, mp);
>		printf("==== ext2_mountfs(): err=%d\n", error);
>	} else {
>		if (devvp != ump->um_devvp) {
>			vput(devvp);
>			return (EINVAL);	/* needs translation */
>		} else
>			vput(devvp);
>	}
>	if (error) {
>		vrele(devvp);
>		return (error);
>	}
>	ump = VFSTOEXT2(mp);
>	fs = ump->um_e2fs;
>
>	/*
>	 * Note that this strncpy() is ok because of a check at the start
>	 * of ext2_mount().
>	 */
>	strncpy(fs->e2fs_fsmnt, path, MAXMNTLEN);
>	fs->e2fs_fsmnt[MAXMNTLEN - 1] = '\0';
>	vfs_mountedfrom(mp, fspec);
>	return (0);
>}
>
>static int
>ext2_check_sb_compat(struct ext2fs *es, struct cdev *dev, int ronly)
>{
>	uint32_t i, mask;
>
>	if (le16toh(es->e2fs_magic) != E2FS_MAGIC) {
>		printf("ext2fs: %s: wrong magic number %#x (expected %#x)\n",
>		    devtoname(dev), le16toh(es->e2fs_magic), E2FS_MAGIC);
>		return (1);
>	}
>	if (le32toh(es->e2fs_rev) > E2FS_REV0) {
>		mask = le32toh(es->e2fs_features_incompat) & ~(EXT2F_INCOMPAT_SUPP);
>		if (mask) {
>			printf("WARNING: mount of %s denied due to "
>			    "unsupported optional features:\n", devtoname(dev));
>			for (i = 0;
>			    i < sizeof(incompat)/sizeof(struct ext2_feature);
>			    i++)
>				if (mask & incompat[i].mask)
>					printf("%s ", incompat[i].name);
>			printf("\n");
>			return (1);
>		}
>		mask = le32toh(es->e2fs_features_rocompat) & ~EXT2F_ROCOMPAT_SUPP;
>		if (!ronly && mask) {
>			printf("WARNING: R/W mount of %s denied due to "
>			    "unsupported optional features:\n", devtoname(dev));
>			for (i = 0;
>			    i < sizeof(ro_compat)/sizeof(struct ext2_feature);
>			    i++)
>				if (mask & ro_compat[i].mask)
>					printf("%s ", ro_compat[i].name);
>			printf("\n");
>			return (1);
>		}
>	}
>	return (0);
>}
>
>static e4fs_daddr_t
>ext2_cg_location(struct m_ext2fs *fs, int number)
>{
>	int cg, descpb, logical_sb, has_super = 0;
>
>	/*
>	 * Adjust logical superblock block number.
>	 * Godmar thinks: if the blocksize is greater than 1024, then
>	 * the superblock is logically part of block zero.
>	 */
>	logical_sb = fs->e2fs_bsize > SBSIZE ? 0 : 1;
>
>	if (!EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_META_BG) ||
>	    number < le32toh(fs->e2fs->e3fs_first_meta_bg))
>		return (logical_sb + number + 1);
>
>	if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT))
>		descpb = fs->e2fs_bsize / sizeof(struct ext2_gd);
>	else
>		descpb = fs->e2fs_bsize / E2FS_REV0_GD_SIZE;
>
>	cg = descpb * number;
>
>	if (ext2_cg_has_sb(fs, cg))
>		has_super = 1;
>
>	return (has_super + cg * (e4fs_daddr_t)EXT2_BLOCKS_PER_GROUP(fs) +
>	    le32toh(fs->e2fs->e2fs_first_dblock));
>}
>
>static int
>ext2_cg_validate(struct m_ext2fs *fs)
>{
>	uint64_t b_bitmap;
>	uint64_t i_bitmap;
>	uint64_t i_tables;
>	uint64_t first_block, last_block, last_cg_block;
>	struct ext2_gd *gd;
>	unsigned int i, cg_count;
>
>	first_block = le32toh(fs->e2fs->e2fs_first_dblock);
>	last_cg_block = ext2_cg_number_gdb(fs, 0);
>	cg_count = fs->e2fs_gcount;
>
>	for (i = 0; i < fs->e2fs_gcount; i++) {
>		gd = &fs->e2fs_gd[i];
>
>		if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_FLEX_BG) ||
>		    i == fs->e2fs_gcount - 1) {
>			last_block = fs->e2fs_bcount - 1;
>		} else {
>			last_block = first_block +
>			    (EXT2_BLOCKS_PER_GROUP(fs) - 1);
>		}
>
>		if ((cg_count == fs->e2fs_gcount) &&
>		    !(le16toh(gd->ext4bgd_flags) & EXT2_BG_INODE_ZEROED))
>			cg_count = i;
>
>		b_bitmap = e2fs_gd_get_b_bitmap(gd);
>		if (b_bitmap == 0) {
>			SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
>			    "block bitmap is zero", i);
>			return (EINVAL);
>		}
>		if (b_bitmap <= last_cg_block) {
>			SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
>			    "block bitmap overlaps gds", i);
>			return (EINVAL);
>		}
>		if (b_bitmap < first_block || b_bitmap > last_block) {
>			SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
>			    "block bitmap not in group", i);
>			return (EINVAL);
>		}
>
>		i_bitmap = e2fs_gd_get_i_bitmap(gd);
>		if (i_bitmap == 0) {
>			SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
>			    "inode bitmap is zero", i);
>			return (EINVAL);
>		}
>		if (i_bitmap <= last_cg_block) {
>			SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
>			    "inode bitmap overlaps gds", i);
>			return (EINVAL);
>		}
>		if (i_bitmap < first_block || i_bitmap > last_block) {
>			SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
>			    "inode bitmap not in group blk", i);
>			return (EINVAL);
>		}
>
>		i_tables = e2fs_gd_get_i_tables(gd);
>		if (i_tables == 0) {
>			SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
>			    "inode table is zero", i);
>			return (EINVAL);
>		}
>		if (i_tables <= last_cg_block) {
>			SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
>			    "inode tables overlaps gds", i);
>			return (EINVAL);
>		}
>		if (i_tables < first_block ||
>		    i_tables + fs->e2fs_itpg - 1 > last_block) {
>			SDT_PROBE2(ext2fs, , vfsops, ext2_cg_validate_error,
>			    "inode tables not in group blk", i);
>			return (EINVAL);
>		}
>
>		if (!EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_FLEX_BG))
>			first_block += EXT2_BLOCKS_PER_GROUP(fs);
>	}
>
>	return (0);
>}
>
>/*
> * This computes the fields of the m_ext2fs structure from the
> * data in the ext2fs structure read in.
> */
>static int
>ext2_compute_sb_data(struct vnode *devvp, struct ext2fs *es,
>    struct m_ext2fs *fs)
>{
>	struct buf *bp;
>	uint32_t e2fs_descpb, e2fs_gdbcount_alloc;
>	int i, j;
>	int g_count = 0;
>	int error;
>
>	/* Check if first dblock is valid */
>	if (fs->e2fs->e2fs_bcount >= 1024 && fs->e2fs->e2fs_first_dblock) {
>		SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>		    "first dblock is invalid");
>		return (EINVAL);
>	}
>
>	/* Check checksum features */
>	if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) &&
>	    EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) {
>		SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>		    "incorrect checksum features combination");
>		return (EINVAL);
>	}
>
>	/* Precompute checksum seed for all metadata */
>	ext2_sb_csum_set_seed(fs);
>
>	/* Verify sb csum if possible */
>	if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) {
>		error = ext2_sb_csum_verify(fs);
>		if (error) {
>			printf("ext2_mountfs():ext2_sb_csum_verify():err=%d\n", error);
>			return (error);
>		}
>	}
>
>	/* Check for block size = 1K|2K|4K */
>	if (le32toh(es->e2fs_log_bsize) > 2) {
>		SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>		    "bad block size");
>		return (EINVAL);
>	}
>
>	fs->e2fs_bshift = EXT2_MIN_BLOCK_LOG_SIZE + le32toh(es->e2fs_log_bsize);
>	fs->e2fs_bsize = 1U << fs->e2fs_bshift;
>	fs->e2fs_fsbtodb = le32toh(es->e2fs_log_bsize) + 1;
>	fs->e2fs_qbmask = fs->e2fs_bsize - 1;
>
>	/* Check for fragment size */
>	if (le32toh(es->e2fs_log_fsize) >
>	    (EXT2_MAX_FRAG_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE)) {
>		SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>		    "invalid log cluster size");
>		return (EINVAL);
>	}
>
>	fs->e2fs_fsize = EXT2_MIN_FRAG_SIZE << le32toh(es->e2fs_log_fsize);
>	if (fs->e2fs_fsize != fs->e2fs_bsize) {
>		SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>		    "fragment size != block size");
>		return (EINVAL);
>	}
>
>	fs->e2fs_fpb = fs->e2fs_bsize / fs->e2fs_fsize;
>
>	/* Check reserved gdt blocks for future filesystem expansion */
>	if (le16toh(es->e2fs_reserved_ngdb) > (fs->e2fs_bsize / 4)) {
>		SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>		    "number of reserved GDT blocks too large");
>		return (EINVAL);
>	}
>
>	if (le32toh(es->e2fs_rev) == E2FS_REV0) {
>		fs->e2fs_isize = E2FS_REV0_INODE_SIZE;
>	} else {
>		fs->e2fs_isize = le16toh(es->e2fs_inode_size);
>
>		/*
>		 * Check first ino.
>		 */
>		if (le32toh(es->e2fs_first_ino) < EXT2_FIRSTINO) {
>			SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>			    "invalid first ino");
>			return (EINVAL);
>		}
>
>		/*
>		 * Simple sanity check for superblock inode size value.
>		 */
>		if (EXT2_INODE_SIZE(fs) < E2FS_REV0_INODE_SIZE ||
>		    EXT2_INODE_SIZE(fs) > fs->e2fs_bsize ||
>		    (fs->e2fs_isize & (fs->e2fs_isize - 1)) != 0) {
>			SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>			    "invalid inode size");
>			return (EINVAL);
>		}
>	}
>
>	/* Check group descriptors */
>	if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT) &&
>	    le16toh(es->e3fs_desc_size) != E2FS_64BIT_GD_SIZE) {
>		SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>		    "unsupported 64bit descriptor size");
>		return (EINVAL);
>	}
>
>	fs->e2fs_bpg = le32toh(es->e2fs_bpg);
>	fs->e2fs_fpg = le32toh(es->e2fs_fpg);
>	if (fs->e2fs_bpg == 0 || fs->e2fs_fpg == 0) {
>		SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>		    "zero blocks/fragments per group");
>		return (EINVAL);
>	} else if (fs->e2fs_bpg != fs->e2fs_fpg) {
>		SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>		    "blocks per group not equal fragments per group");
>		return (EINVAL);
>	}
>
>	if (fs->e2fs_bpg != fs->e2fs_bsize * 8) {
>		SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>		    "non-standard group size unsupported");
>		return (EINVAL);
>	}
>
>	fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs);
>	if (fs->e2fs_ipb == 0 ||
>	    fs->e2fs_ipb > fs->e2fs_bsize / E2FS_REV0_INODE_SIZE) {
>		SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>		    "bad inodes per block size");
>		return (EINVAL);
>	}
>
>	fs->e2fs_ipg = le32toh(es->e2fs_ipg);
>	if (fs->e2fs_ipg < fs->e2fs_ipb || fs->e2fs_ipg >  fs->e2fs_bsize * 8) {
>		SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>		    "invalid inodes per group");
>		return (EINVAL);
>	}
>
>	fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb;
>
>	fs->e2fs_bcount = le32toh(es->e2fs_bcount);
>	fs->e2fs_rbcount = le32toh(es->e2fs_rbcount);
>	fs->e2fs_fbcount = le32toh(es->e2fs_fbcount);
>	if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) {
>		fs->e2fs_bcount |= (uint64_t)(le32toh(es->e4fs_bcount_hi)) << 32;
>		fs->e2fs_rbcount |= (uint64_t)(le32toh(es->e4fs_rbcount_hi)) << 32;
>		fs->e2fs_fbcount |= (uint64_t)(le32toh(es->e4fs_fbcount_hi)) << 32;
>	}
>	if (fs->e2fs_rbcount > fs->e2fs_bcount ||
>	    fs->e2fs_fbcount > fs->e2fs_bcount) {
>		SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>		    "invalid block count");
>		return (EINVAL);
>	}
>
>	fs->e2fs_ficount = le32toh(es->e2fs_ficount);
>	if (fs->e2fs_ficount > le32toh(es->e2fs_icount)) {
>		SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>		    "invalid number of free inodes");
>		return (EINVAL);
>	}
>
>	if (le32toh(es->e2fs_first_dblock) != (fs->e2fs_bsize > 1024 ? 0 : 1) ||
>	    le32toh(es->e2fs_first_dblock) >= fs->e2fs_bcount) {
>		SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>		    "first data block out of range");
>		return (EINVAL);
>	}
>
>	fs->e2fs_gcount = howmany(fs->e2fs_bcount -
>	    le32toh(es->e2fs_first_dblock), EXT2_BLOCKS_PER_GROUP(fs));
>	if (fs->e2fs_gcount > ((uint64_t)1 << 32) - EXT2_DESCS_PER_BLOCK(fs)) {
>		SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>		    "groups count too large");
>		return (EINVAL);
>	}
>
>	/* Check for extra isize in big inodes. */
>	if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_EXTRA_ISIZE) &&
>	    EXT2_INODE_SIZE(fs) < sizeof(struct ext2fs_dinode)) {
>		SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
>		    "no space for extra inode timestamps");
>		return (EINVAL);
>	}
>
>	/* s_resuid / s_resgid ? */
>
>	if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) {
>		e2fs_descpb = fs->e2fs_bsize / E2FS_64BIT_GD_SIZE;
>		e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount, e2fs_descpb);
>	} else {
>		e2fs_descpb = fs->e2fs_bsize / E2FS_REV0_GD_SIZE;
>		e2fs_gdbcount_alloc = howmany(fs->e2fs_gcount,
>		    fs->e2fs_bsize / sizeof(struct ext2_gd));
>	}
>	fs->e2fs_gdbcount = howmany(fs->e2fs_gcount, e2fs_descpb);
>	fs->e2fs_gd = malloc(e2fs_gdbcount_alloc * fs->e2fs_bsize,
>	    M_EXT2MNT, M_WAITOK | M_ZERO);
>	fs->e2fs_contigdirs = malloc(fs->e2fs_gcount *
>	    sizeof(*fs->e2fs_contigdirs), M_EXT2MNT, M_WAITOK | M_ZERO);
>
>	for (i = 0; i < fs->e2fs_gdbcount; i++) {
>		error = bread(devvp,
>		    fsbtodb(fs, ext2_cg_location(fs, i)),
>		    fs->e2fs_bsize, NOCRED, &bp);
>		if (error) {
>			/*
>			 * fs->e2fs_gd and fs->e2fs_contigdirs
>			 * will be freed later by the caller,
>			 * because this function could be called from
>			 * MNT_UPDATE path.
>			 */
>			return (error);
>		}
>		if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) {
>			memcpy(&fs->e2fs_gd[
>			    i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
>			    bp->b_data, fs->e2fs_bsize);
>		} else {
>			for (j = 0; j < e2fs_descpb &&
>			    g_count < fs->e2fs_gcount; j++, g_count++)
>				memcpy(&fs->e2fs_gd[g_count],
>				    bp->b_data + j * E2FS_REV0_GD_SIZE,
>				    E2FS_REV0_GD_SIZE);
>		}
>		brelse(bp);
>		bp = NULL;
>	}
>
>	/* Validate cgs consistency */
>	error = ext2_cg_validate(fs);
>	if (error) {
>		printf("ext2_mountfs():ext2_cg_validate():err=%d\n", error);
>		return (error);
>	}
>
>	/* Verfy cgs csum */
>	if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) ||
>	    EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) {
>		error = ext2_gd_csum_verify(fs, devvp->v_rdev);
>		if (error) {
>			printf("ext2_mountfs():ext2_sb_csum_verify():err=%d\n", error);
>			return (error);
>		}
>	}
>	/* Initialization for the ext2 Orlov allocator variant. */
>	fs->e2fs_total_dir = 0;
>	for (i = 0; i < fs->e2fs_gcount; i++)
>		fs->e2fs_total_dir += e2fs_gd_get_ndirs(&fs->e2fs_gd[i]);
>
>	if (le32toh(es->e2fs_rev) == E2FS_REV0 ||
>	    !EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_LARGEFILE))
>		fs->e2fs_maxfilesize = 0x7fffffff;
>	else {
>		fs->e2fs_maxfilesize = 0xffffffffffff;
>		if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_HUGE_FILE))
>			fs->e2fs_maxfilesize = 0x7fffffffffffffff;
>	}
>	if (le32toh(es->e4fs_flags) & E2FS_UNSIGNED_HASH) {
>		fs->e2fs_uhash = 3;
>	} else if ((le32toh(es->e4fs_flags) & E2FS_SIGNED_HASH) == 0) {
>#ifdef __CHAR_UNSIGNED__
>		es->e4fs_flags = htole32(le32toh(es->e4fs_flags) | E2FS_UNSIGNED_HASH);
>		fs->e2fs_uhash = 3;
>#else
>		es->e4fs_flags = htole32(le32toh(es->e4fs_flags) | E2FS_SIGNED_HASH);
>#endif
>	}
>	if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) {
>		error = ext2_sb_csum_verify(fs);
>		printf("ext2_mountfs():ext2_sb_csum_verify():P1:err=%d\n", error);
>	}
>
>	return (error);
>}
>
>/*
> * Reload all incore data for a filesystem (used after running fsck on
> * the root filesystem and finding things to fix). The filesystem must
> * be mounted read-only.
> *
> * Things to do to update the mount:
> *	1) invalidate all cached meta-data.
> *	2) re-read superblock from disk.
> *	3) invalidate all cluster summary information.
> *	4) invalidate all inactive vnodes.
> *	5) invalidate all cached file data.
> *	6) re-read inode data for all active vnodes.
> * XXX we are missing some steps, in particular # 3, this has to be reviewed.
> */
>static int
>ext2_reload(struct mount *mp, struct thread *td)
>{
>	struct vnode *vp, *mvp, *devvp;
>	struct inode *ip;
>	struct buf *bp;
>	struct ext2fs *es;
>	struct m_ext2fs *fs;
>	struct csum *sump;
>	int error, i;
>	int32_t *lp;
>
>	if ((mp->mnt_flag & MNT_RDONLY) == 0)
>		return (EINVAL);
>	/*
>	 * Step 1: invalidate all cached meta-data.
>	 */
>	devvp = VFSTOEXT2(mp)->um_devvp;
>	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
>	if (vinvalbuf(devvp, 0, 0, 0) != 0)
>		panic("ext2_reload: dirty1");
>	VOP_UNLOCK(devvp);
>
>	/*
>	 * Step 2: re-read superblock from disk.
>	 * constants have been adjusted for ext2
>	 */
>	if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
>		return (error);
>	es = (struct ext2fs *)bp->b_data;
>	if (ext2_check_sb_compat(es, devvp->v_rdev, 0) != 0) {
>		brelse(bp);
>		return (EIO);		/* XXX needs translation */
>	}
>	fs = VFSTOEXT2(mp)->um_e2fs;
>	bcopy(bp->b_data, fs->e2fs, sizeof(struct ext2fs));
>
>	if ((error = ext2_compute_sb_data(devvp, es, fs)) != 0) {
>		brelse(bp);
>		return (error);
>	}
>#ifdef UNKLAR
>	if (fs->fs_sbsize < SBSIZE)
>		bp->b_flags |= B_INVAL;
>#endif
>	brelse(bp);
>
>	/*
>	 * Step 3: invalidate all cluster summary information.
>	 */
>	if (fs->e2fs_contigsumsize > 0) {
>		lp = fs->e2fs_maxcluster;
>		sump = fs->e2fs_clustersum;
>		for (i = 0; i < fs->e2fs_gcount; i++, sump++) {
>			*lp++ = fs->e2fs_contigsumsize;
>			sump->cs_init = 0;
>			bzero(sump->cs_sum, fs->e2fs_contigsumsize + 1);
>		}
>	}
>
>loop:
>	MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
>		/*
>		 * Step 4: invalidate all cached file data.
>		 */
>		if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) {
>			MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
>			goto loop;
>		}
>		if (vinvalbuf(vp, 0, 0, 0))
>			panic("ext2_reload: dirty2");
>
>		/*
>		 * Step 5: re-read inode data for all active vnodes.
>		 */
>		ip = VTOI(vp);
>		error = bread(devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)),
>		    (int)fs->e2fs_bsize, NOCRED, &bp);
>		if (error) {
>			VOP_UNLOCK(vp);
>			vrele(vp);
>			MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
>			return (error);
>		}
>
>		error = ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data +
>		    EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ip->i_number)), ip);
>
>		brelse(bp);
>		VOP_UNLOCK(vp);
>		vrele(vp);
>
>		if (error) {
>			MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
>			return (error);
>		}
>	}
>	return (0);
>}
>
>/*
> * Common code for mount and mountroot.
> */
>static int
>ext2_mountfs(struct vnode *devvp, struct mount *mp)
>{
>	struct ext2mount *ump;
>	struct buf *bp;
>	struct m_ext2fs *fs;
>	struct ext2fs *es;
>	struct cdev *dev = devvp->v_rdev;
>	struct g_consumer *cp;
>	struct bufobj *bo;
>	struct csum *sump;
>	int error;
>	int ronly;
>	int i;
>	u_long size;
>	int32_t *lp;
>	int32_t e2fs_maxcontig;
>
>	ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0);
>	/* XXX: use VOP_ACESS to check FS perms */
>	g_topology_lock();
>	error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1);
>	g_topology_unlock();
>	VOP_UNLOCK(devvp);
>	if (error) {
>		printf("ext2_mountfs():g_vfs_open():err=%d\n", error);
>		return (error);
>	}
>
>	/* XXX: should we check for some sectorsize or 512 instead? */
>	if (((SBSIZE % cp->provider->sectorsize) != 0) ||
>	    (SBSIZE < cp->provider->sectorsize)) {
>		g_topology_lock();
>		g_vfs_close(cp);
>		g_topology_unlock();
>		printf("ext2_mountfs():SBSIZE:%d:%d,err=EINVAL\n", SBSIZE, cp->provider->sectorsize);
>		return (EINVAL);
>	}
>
>	bo = &devvp->v_bufobj;
>	bo->bo_private = cp;
>	bo->bo_ops = g_vfs_bufops;
>	if (devvp->v_rdev->si_iosize_max != 0)
>		mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
>	if (mp->mnt_iosize_max > maxphys)
>		mp->mnt_iosize_max = maxphys;
>
>	bp = NULL;
>	ump = NULL;
>	if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
>		goto out;
>	es = (struct ext2fs *)bp->b_data;
>	if (ext2_check_sb_compat(es, dev, ronly) != 0) {
>		error = EINVAL;		/* XXX needs translation */
>		printf("ext2_mountfs():ext2_check_sb_compat():err=%d\n", error);
>		goto out;
>	}
>	if ((le16toh(es->e2fs_state) & E2FS_ISCLEAN) == 0 ||
>	    (le16toh(es->e2fs_state) & E2FS_ERRORS)) {
>		if (ronly || (mp->mnt_flag & MNT_FORCE)) {
>			printf(
>"WARNING: Filesystem was not properly dismounted\n");
>		} else {
>			printf(
>"WARNING: R/W mount denied.  Filesystem is not clean - run fsck\n");
>			error = EPERM;
>			goto out;
>		}
>	}
>	ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO);
>
>	/*
>	 * I don't know whether this is the right strategy. Note that
>	 * we dynamically allocate both an m_ext2fs and an ext2fs
>	 * while Linux keeps the super block in a locked buffer.
>	 */
>	ump->um_e2fs = malloc(sizeof(struct m_ext2fs),
>	    M_EXT2MNT, M_WAITOK | M_ZERO);
>	ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs),
>	    M_EXT2MNT, M_WAITOK);
>	mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF);
>	bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs));
>	if ((error = ext2_compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs))) {
>		printf("ext2_mountfs():ext2_compute_sb_data():err=%d\n", error);
>		goto out;
>	}
>
>	/*
>	 * Calculate the maximum contiguous blocks and size of cluster summary
>	 * array.  In FFS this is done by newfs; however, the superblock
>	 * in ext2fs doesn't have these variables, so we can calculate
>	 * them here.
>	 */
>	e2fs_maxcontig = MAX(1, maxphys / ump->um_e2fs->e2fs_bsize);
>	ump->um_e2fs->e2fs_contigsumsize = MIN(e2fs_maxcontig, EXT2_MAXCONTIG);
>	ump->um_e2fs->e2fs_maxsymlinklen = EXT2_MAXSYMLINKLEN;
>	if (ump->um_e2fs->e2fs_contigsumsize > 0) {
>		size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t);
>		ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK);
>		size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum);
>		ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK);
>		lp = ump->um_e2fs->e2fs_maxcluster;
>		sump = ump->um_e2fs->e2fs_clustersum;
>		for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) {
>			*lp++ = ump->um_e2fs->e2fs_contigsumsize;
>			sump->cs_init = 0;
>			sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) *
>			    sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO);
>		}
>	}
>
>	brelse(bp);
>	bp = NULL;
>	fs = ump->um_e2fs;
>	fs->e2fs_ronly = ronly;	/* ronly is set according to mnt_flags */
>
>	/*
>	 * If the fs is not mounted read-only, make sure the super block is
>	 * always written back on a sync().
>	 */
>	fs->e2fs_wasvalid = le16toh(fs->e2fs->e2fs_state) & E2FS_ISCLEAN ? 1 : 0;
>	if (ronly == 0) {
>		fs->e2fs_fmod = 1;	/* mark it modified and set fs invalid */
>		fs->e2fs->e2fs_state =
>		    htole16(le16toh(fs->e2fs->e2fs_state) & ~E2FS_ISCLEAN);
>	}
>	mp->mnt_data = ump;
>	mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
>	mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
>	MNT_ILOCK(mp);
>	mp->mnt_flag |= MNT_LOCAL;
>	MNT_IUNLOCK(mp);
>	ump->um_mountp = mp;
>	ump->um_dev = dev;
>	ump->um_devvp = devvp;
>	ump->um_bo = &devvp->v_bufobj;
>	ump->um_cp = cp;
>
>	/*
>	 * Setting those two parameters allowed us to use
>	 * ufs_bmap w/o changse!
>	 */
>	ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
>	ump->um_bptrtodb = le32toh(fs->e2fs->e2fs_log_bsize) + 1;
>	ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
>	if (ronly == 0)
>		ext2_sbupdate(ump, MNT_WAIT);
>	/*
>	 * Initialize filesystem stat information in mount struct.
>	 */
>	MNT_ILOCK(mp);
>	mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED |
>	    MNTK_USES_BCACHE;
>	MNT_IUNLOCK(mp);
>	return (0);
>out:
>	if (bp)
>		brelse(bp);
>	if (cp != NULL) {
>		g_topology_lock();
>		g_vfs_close(cp);
>		g_topology_unlock();
>	}
>	if (ump) {
>		mtx_destroy(EXT2_MTX(ump));
>		free(ump->um_e2fs->e2fs_gd, M_EXT2MNT);
>		free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT);
>		free(ump->um_e2fs->e2fs, M_EXT2MNT);
>		free(ump->um_e2fs, M_EXT2MNT);
>		free(ump, M_EXT2MNT);
>		mp->mnt_data = NULL;
>	}
>	return (error);
>}
>
>/*
> * Unmount system call.
> */
>static int
>ext2_unmount(struct mount *mp, int mntflags)
>{
>	struct ext2mount *ump;
>	struct m_ext2fs *fs;
>	struct csum *sump;
>	int error, flags, i, ronly;
>
>	flags = 0;
>	if (mntflags & MNT_FORCE) {
>		if (mp->mnt_flag & MNT_ROOTFS)
>			return (EINVAL);
>		flags |= FORCECLOSE;
>	}
>	if ((error = ext2_flushfiles(mp, flags, curthread)) != 0)
>		return (error);
>	ump = VFSTOEXT2(mp);
>	fs = ump->um_e2fs;
>	ronly = fs->e2fs_ronly;
>	if (ronly == 0 && ext2_cgupdate(ump, MNT_WAIT) == 0) {
>		if (fs->e2fs_wasvalid)
>			fs->e2fs->e2fs_state =
>			    htole16(le16toh(fs->e2fs->e2fs_state) | E2FS_ISCLEAN);
>		ext2_sbupdate(ump, MNT_WAIT);
>	}
>
>	g_topology_lock();
>	g_vfs_close(ump->um_cp);
>	g_topology_unlock();
>	vrele(ump->um_devvp);
>	sump = fs->e2fs_clustersum;
>	for (i = 0; i < fs->e2fs_gcount; i++, sump++)
>		free(sump->cs_sum, M_EXT2MNT);
>	free(fs->e2fs_clustersum, M_EXT2MNT);
>	free(fs->e2fs_maxcluster, M_EXT2MNT);
>	free(fs->e2fs_gd, M_EXT2MNT);
>	free(fs->e2fs_contigdirs, M_EXT2MNT);
>	free(fs->e2fs, M_EXT2MNT);
>	free(fs, M_EXT2MNT);
>	free(ump, M_EXT2MNT);
>	mp->mnt_data = NULL;
>	return (error);
>}
>
>/*
> * Flush out all the files in a filesystem.
> */
>static int
>ext2_flushfiles(struct mount *mp, int flags, struct thread *td)
>{
>	int error;
>
>	error = vflush(mp, 0, flags, td);
>	return (error);
>}
>
>/*
> * Get filesystem statistics.
> */
>int
>ext2_statfs(struct mount *mp, struct statfs *sbp)
>{
>	struct ext2mount *ump;
>	struct m_ext2fs *fs;
>	uint32_t overhead, overhead_per_group, ngdb;
>	int i, ngroups;
>
>	ump = VFSTOEXT2(mp);
>	fs = ump->um_e2fs;
>	if (le16toh(fs->e2fs->e2fs_magic) != E2FS_MAGIC)
>		panic("ext2_statfs");
>
>	/*
>	 * Compute the overhead (FS structures)
>	 */
>	overhead_per_group =
>	    1 /* block bitmap */ +
>	    1 /* inode bitmap */ +
>	    fs->e2fs_itpg;
>	overhead = le32toh(fs->e2fs->e2fs_first_dblock) +
>	    fs->e2fs_gcount * overhead_per_group;
>	if (le32toh(fs->e2fs->e2fs_rev) > E2FS_REV0 &&
>	    le32toh(fs->e2fs->e2fs_features_rocompat) & EXT2F_ROCOMPAT_SPARSESUPER) {
>		for (i = 0, ngroups = 0; i < fs->e2fs_gcount; i++) {
>			if (ext2_cg_has_sb(fs, i))
>				ngroups++;
>		}
>	} else {
>		ngroups = fs->e2fs_gcount;
>	}
>	ngdb = fs->e2fs_gdbcount;
>	if (le32toh(fs->e2fs->e2fs_rev) > E2FS_REV0 &&
>	    le32toh(fs->e2fs->e2fs_features_compat) & EXT2F_COMPAT_RESIZE)
>		ngdb += le16toh(fs->e2fs->e2fs_reserved_ngdb);
>	overhead += ngroups * (1 /* superblock */ + ngdb);
>
>	sbp->f_bsize = EXT2_FRAG_SIZE(fs);
>	sbp->f_iosize = EXT2_BLOCK_SIZE(fs);
>	sbp->f_blocks = fs->e2fs_bcount - overhead;
>	sbp->f_bfree = fs->e2fs_fbcount;
>	sbp->f_bavail = sbp->f_bfree - fs->e2fs_rbcount;
>	sbp->f_files = le32toh(fs->e2fs->e2fs_icount);
>	sbp->f_ffree = fs->e2fs_ficount;
>	return (0);
>}
>
>/*
> * Go through the disk queues to initiate sandbagged IO;
> * go through the inodes to write those that have been modified;
> * initiate the writing of the super block if it has been modified.
> *
> * Note: we are always called with the filesystem marked `MPBUSY'.
> */
>static int
>ext2_sync(struct mount *mp, int waitfor)
>{
>	struct vnode *mvp, *vp;
>	struct thread *td;
>	struct inode *ip;
>	struct ext2mount *ump = VFSTOEXT2(mp);
>	struct m_ext2fs *fs;
>	int error, allerror = 0;
>
>	td = curthread;
>	fs = ump->um_e2fs;
>	if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) {		/* XXX */
>		panic("ext2_sync: rofs mod fs=%s", fs->e2fs_fsmnt);
>	}
>
>	/*
>	 * Write back each (modified) inode.
>	 */
>loop:
>	MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
>		if (vp->v_type == VNON) {
>			VI_UNLOCK(vp);
>			continue;
>		}
>		ip = VTOI(vp);
>		if ((ip->i_flag &
>		    (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
>		    (vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
>		    waitfor == MNT_LAZY)) {
>			VI_UNLOCK(vp);
>			continue;
>		}
>		error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK);
>		if (error) {
>			if (error == ENOENT) {
>				MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
>				goto loop;
>			}
>			continue;
>		}
>		if ((error = VOP_FSYNC(vp, waitfor, td)) != 0)
>			allerror = error;
>		VOP_UNLOCK(vp);
>		vrele(vp);
>	}
>
>	/*
>	 * Force stale filesystem control information to be flushed.
>	 */
>	if (waitfor != MNT_LAZY) {
>		vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
>		if ((error = VOP_FSYNC(ump->um_devvp, waitfor, td)) != 0)
>			allerror = error;
>		VOP_UNLOCK(ump->um_devvp);
>	}
>
>	/*
>	 * Write back modified superblock.
>	 */
>	if (fs->e2fs_fmod != 0) {
>		fs->e2fs_fmod = 0;
>		fs->e2fs->e2fs_wtime = htole32(time_second);
>		if ((error = ext2_cgupdate(ump, waitfor)) != 0)
>			allerror = error;
>	}
>	return (allerror);
>}
>
>/*
> * Look up an EXT2FS dinode number to find its incore vnode, otherwise read it
> * in from disk.  If it is in core, wait for the lock bit to clear, then
> * return the inode locked.  Detection and handling of mount points must be
> * done by the calling routine.
> */
>static int
>ext2_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
>{
>	struct m_ext2fs *fs;
>	struct inode *ip;
>	struct ext2mount *ump;
>	struct buf *bp;
>	struct vnode *vp;
>	struct thread *td;
>	unsigned int i, used_blocks;
>	int error;
>
>	td = curthread;
>	error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL);
>	if (error || *vpp != NULL)
>		return (error);
>
>	ump = VFSTOEXT2(mp);
>	ip = malloc(sizeof(struct inode), M_EXT2NODE, M_WAITOK | M_ZERO);
>
>	/* Allocate a new vnode/inode. */
>	if ((error = getnewvnode("ext2fs", mp, &ext2_vnodeops, &vp)) != 0) {
>		*vpp = NULL;
>		free(ip, M_EXT2NODE);
>		return (error);
>	}
>	vp->v_data = ip;
>	ip->i_vnode = vp;
>	ip->i_e2fs = fs = ump->um_e2fs;
>	ip->i_ump = ump;
>	ip->i_number = ino;
>
>	lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
>	error = insmntque(vp, mp);
>	if (error != 0) {
>		free(ip, M_EXT2NODE);
>		*vpp = NULL;
>		return (error);
>	}
>	error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
>	if (error || *vpp != NULL)
>		return (error);
>
>	/* Read in the disk contents for the inode, copy into the inode. */
>	if ((error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
>	    (int)fs->e2fs_bsize, NOCRED, &bp)) != 0) {
>		/*
>		 * The inode does not contain anything useful, so it would
>		 * be misleading to leave it on its hash chain. With mode
>		 * still zero, it will be unlinked and returned to the free
>		 * list by vput().
>		 */
>		brelse(bp);
>		vput(vp);
>		*vpp = NULL;
>		return (error);
>	}
>	/* convert ext2 inode to dinode */
>	error = ext2_ei2i((struct ext2fs_dinode *)((char *)bp->b_data +
>	    EXT2_INODE_SIZE(fs) * ino_to_fsbo(fs, ino)), ip);
>	if (error) {
>		brelse(bp);
>		vput(vp);
>		*vpp = NULL;
>		return (error);
>	}
>	ip->i_block_group = ino_to_cg(fs, ino);
>	ip->i_next_alloc_block = 0;
>	ip->i_next_alloc_goal = 0;
>
>	/*
>	 * Now we want to make sure that block pointers for unused
>	 * blocks are zeroed out - ext2_balloc depends on this
>	 * although for regular files and directories only
>	 *
>	 * If IN_E4EXTENTS is enabled, unused blocks are not zeroed
>	 * out because we could corrupt the extent tree.
>	 */
>	if (!(ip->i_flag & IN_E4EXTENTS) &&
>	    (S_ISDIR(ip->i_mode) || S_ISREG(ip->i_mode))) {
>		used_blocks = howmany(ip->i_size, fs->e2fs_bsize);
>		for (i = used_blocks; i < EXT2_NDIR_BLOCKS; i++)
>			ip->i_db[i] = 0;
>	}
>#ifdef EXT2FS_PRINT_EXTENTS
>	ext2_print_inode(ip);
>	ext4_ext_print_extent_tree_status(ip);
>#endif
>	bqrelse(bp);
>
>	/*
>	 * Initialize the vnode from the inode, check for aliases.
>	 * Note that the underlying vnode may have changed.
>	 */
>	if ((error = ext2_vinit(mp, &ext2_fifoops, &vp)) != 0) {
>		vput(vp);
>		*vpp = NULL;
>		return (error);
>	}
>
>	/*
>	 * Finish inode initialization.
>	 */
>
>	*vpp = vp;
>	return (0);
>}
>
>/*
> * File handle to vnode
> *
> * Have to be really careful about stale file handles:
> * - check that the inode number is valid
> * - call ext2_vget() to get the locked inode
> * - check for an unallocated inode (i_mode == 0)
> * - check that the given client host has export rights and return
> *   those rights via. exflagsp and credanonp
> */
>static int
>ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
>{
>	struct inode *ip;
>	struct ufid *ufhp;
>	struct vnode *nvp;
>	struct m_ext2fs *fs;
>	int error;
>
>	ufhp = (struct ufid *)fhp;
>	fs = VFSTOEXT2(mp)->um_e2fs;
>	if (ufhp->ufid_ino < EXT2_ROOTINO ||
>	    ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs_ipg)
>		return (ESTALE);
>
>	error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
>	if (error) {
>		*vpp = NULLVP;
>		return (error);
>	}
>	ip = VTOI(nvp);
>	if (ip->i_mode == 0 ||
>	    ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) {
>		vput(nvp);
>		*vpp = NULLVP;
>		return (ESTALE);
>	}
>	*vpp = nvp;
>	vnode_create_vobject(*vpp, 0, curthread);
>	return (0);
>}
>
>/*
> * Write a superblock and associated information back to disk.
> */
>static int
>ext2_sbupdate(struct ext2mount *mp, int waitfor)
>{
>	struct m_ext2fs *fs = mp->um_e2fs;
>	struct ext2fs *es = fs->e2fs;
>	struct buf *bp;
>	int error = 0;
>
>	es->e2fs_bcount = htole32(fs->e2fs_bcount & 0xffffffff);
>	es->e2fs_rbcount = htole32(fs->e2fs_rbcount & 0xffffffff);
>	es->e2fs_fbcount = htole32(fs->e2fs_fbcount & 0xffffffff);
>	if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) {
>		es->e4fs_bcount_hi = htole32(fs->e2fs_bcount >> 32);
>		es->e4fs_rbcount_hi = htole32(fs->e2fs_rbcount >> 32);
>		es->e4fs_fbcount_hi = htole32(fs->e2fs_fbcount >> 32);
>	}
>
>	es->e2fs_ficount = htole32(fs->e2fs_ficount);
>
>	if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM))
>		ext2_sb_csum_set(fs);
>
>	bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0, 0);
>	bcopy((caddr_t)es, bp->b_data, (u_int)sizeof(struct ext2fs));
>	if (waitfor == MNT_WAIT)
>		error = bwrite(bp);
>	else
>		bawrite(bp);
>
>	/*
>	 * The buffers for group descriptors, inode bitmaps and block bitmaps
>	 * are not busy at this point and are (hopefully) written by the
>	 * usual sync mechanism. No need to write them here.
>	 */
>	return (error);
>}
>int
>ext2_cgupdate(struct ext2mount *mp, int waitfor)
>{
>	struct m_ext2fs *fs = mp->um_e2fs;
>	struct buf *bp;
>	int i, j, g_count = 0, error = 0, allerror = 0;
>
>	allerror = ext2_sbupdate(mp, waitfor);
>
>	/* Update gd csums */
>	if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_GDT_CSUM) ||
>	    EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM))
>		ext2_gd_csum_set(fs);
>
>	for (i = 0; i < fs->e2fs_gdbcount; i++) {
>		bp = getblk(mp->um_devvp, fsbtodb(fs,
>		    ext2_cg_location(fs, i)),
>		    fs->e2fs_bsize, 0, 0, 0);
>		if (EXT2_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_64BIT)) {
>			memcpy(bp->b_data, &fs->e2fs_gd[
>			    i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
>			    fs->e2fs_bsize);
>		} else {
>			for (j = 0; j < fs->e2fs_bsize / E2FS_REV0_GD_SIZE &&
>			    g_count < fs->e2fs_gcount; j++, g_count++)
>				memcpy(bp->b_data + j * E2FS_REV0_GD_SIZE,
>				    &fs->e2fs_gd[g_count], E2FS_REV0_GD_SIZE);
>		}
>		if (waitfor == MNT_WAIT)
>			error = bwrite(bp);
>		else
>			bawrite(bp);
>	}
>
>	if (!allerror && error)
>		allerror = error;
>	return (allerror);
>}
>
>/*
> * Return the root of a filesystem.
> */
>static int
>ext2_root(struct mount *mp, int flags, struct vnode **vpp)
>{
>	struct vnode *nvp;
>	int error;
>
>	error = VFS_VGET(mp, EXT2_ROOTINO, LK_EXCLUSIVE, &nvp);
>	if (error)
>		return (error);
>	*vpp = nvp;
>	return (0);
>}

Actions: View

Attachments on bug 271105: 241856