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freebsd-nq/sys/fs/ext2fs/ext2_vfsops.c
Konstantin Belousov cd85379104 Make MAXPHYS tunable. Bump MAXPHYS to 1M. 
Replace MAXPHYS by runtime variable maxphys. It is initialized from
MAXPHYS by default, but can be also adjusted with the tunable kern.maxphys.

Make b_pages[] array in struct buf flexible.  Size b_pages[] for buffer
cache buffers exactly to atop(maxbcachebuf) (currently it is sized to
atop(MAXPHYS)), and b_pages[] for pbufs is sized to atop(maxphys) + 1.
The +1 for pbufs allow several pbuf consumers, among them vmapbuf(),
to use unaligned buffers still sized to maxphys, esp. when such
buffers come from userspace (*).  Overall, we save significant amount
of otherwise wasted memory in b_pages[] for buffer cache buffers,
while bumping MAXPHYS to desired high value.

Eliminate all direct uses of the MAXPHYS constant in kernel and driver
sources, except a place which initialize maxphys.  Some random (and
arguably weird) uses of MAXPHYS, e.g. in linuxolator, are converted
straight.  Some drivers, which use MAXPHYS to size embeded structures,
get private MAXPHYS-like constant; their convertion is out of scope
for this work.

Changes to cam/, dev/ahci, dev/ata, dev/mpr, dev/mpt, dev/mvs,
dev/siis, where either submitted by, or based on changes by mav.

Suggested by: mav (*)
Reviewed by:	imp, mav, imp, mckusick, scottl (intermediate versions)
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D27225
2020-11-28 12:12:51 +00:00

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/*-
* 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;
if (vfs_filteropt(opts, ext2_opts))
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')
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) {
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)
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);
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);
} 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 talbes 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 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) {
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_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)
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)
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);
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)
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();
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 */
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)))
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);
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;
mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
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;
MNT_ILOCK(mp);
mp->mnt_flag &= ~MNT_LOCAL;
MNT_IUNLOCK(mp);
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);
}
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