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ext2fs_vfsops.c
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ext2fs_vfsops.c
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/* $NetBSD: ext2fs_vfsops.c,v 1.164 2012/04/30 22:51:28 rmind Exp $ */
/*
* 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 8.14 (Berkeley) 11/28/94
* Modified for ext2fs by Manuel Bouyer.
*/
/*
* Copyright (c) 1997 Manuel Bouyer.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 8.14 (Berkeley) 11/28/94
* Modified for ext2fs by Manuel Bouyer.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ext2fs_vfsops.c,v 1.164 2012/04/30 22:51:28 rmind Exp $");
#if defined(_KERNEL_OPT)
#include "opt_compat_netbsd.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/socket.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <sys/mbuf.h>
#include <sys/file.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/lock.h>
#include <sys/conf.h>
#include <sys/kauth.h>
#include <sys/module.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/specfs/specdev.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/ext2fs/ext2fs.h>
#include <ufs/ext2fs/ext2fs_dir.h>
#include <ufs/ext2fs/ext2fs_extern.h>
MODULE(MODULE_CLASS_VFS, ext2fs, "ffs");
int ext2fs_sbupdate(struct ufsmount *, int);
static int ext2fs_checksb(struct ext2fs *, int);
static struct sysctllog *ext2fs_sysctl_log;
extern const struct vnodeopv_desc ext2fs_vnodeop_opv_desc;
extern const struct vnodeopv_desc ext2fs_specop_opv_desc;
extern const struct vnodeopv_desc ext2fs_fifoop_opv_desc;
const struct vnodeopv_desc * const ext2fs_vnodeopv_descs[] = {
&ext2fs_vnodeop_opv_desc,
&ext2fs_specop_opv_desc,
&ext2fs_fifoop_opv_desc,
NULL,
};
struct vfsops ext2fs_vfsops = {
MOUNT_EXT2FS,
sizeof (struct ufs_args),
ext2fs_mount,
ufs_start,
ext2fs_unmount,
ufs_root,
ufs_quotactl,
ext2fs_statvfs,
ext2fs_sync,
ext2fs_vget,
ext2fs_fhtovp,
ext2fs_vptofh,
ext2fs_init,
ext2fs_reinit,
ext2fs_done,
ext2fs_mountroot,
(int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
vfs_stdextattrctl,
(void *)eopnotsupp, /* vfs_suspendctl */
genfs_renamelock_enter,
genfs_renamelock_exit,
(void *)eopnotsupp,
ext2fs_vnodeopv_descs,
0,
{ NULL, NULL },
};
static const struct genfs_ops ext2fs_genfsops = {
.gop_size = genfs_size,
.gop_alloc = ext2fs_gop_alloc,
.gop_write = genfs_gop_write,
.gop_markupdate = ufs_gop_markupdate,
};
static const struct ufs_ops ext2fs_ufsops = {
.uo_itimes = ext2fs_itimes,
.uo_update = ext2fs_update,
.uo_vfree = ext2fs_vfree,
.uo_unmark_vnode = (void (*)(vnode_t *))nullop,
};
/* Fill in the inode uid/gid from ext2 halves. */
void
ext2fs_set_inode_guid(struct inode *ip)
{
ip->i_gid = ip->i_e2fs_gid;
ip->i_uid = ip->i_e2fs_uid;
if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) {
ip->i_gid |= ip->i_e2fs_gid_high << 16;
ip->i_uid |= ip->i_e2fs_uid_high << 16;
}
}
static int
ext2fs_modcmd(modcmd_t cmd, void *arg)
{
int error;
switch (cmd) {
case MODULE_CMD_INIT:
error = vfs_attach(&ext2fs_vfsops);
if (error != 0)
break;
sysctl_createv(&ext2fs_sysctl_log, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "vfs", NULL,
NULL, 0, NULL, 0,
CTL_VFS, CTL_EOL);
sysctl_createv(&ext2fs_sysctl_log, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "ext2fs",
SYSCTL_DESCR("Linux EXT2FS file system"),
NULL, 0, NULL, 0,
CTL_VFS, 17, CTL_EOL);
/*
* XXX the "17" above could be dynamic, thereby eliminating
* one more instance of the "number to vfs" mapping problem,
* but "17" is the order as taken from sys/mount.h
*/
break;
case MODULE_CMD_FINI:
error = vfs_detach(&ext2fs_vfsops);
if (error != 0)
break;
sysctl_teardown(&ext2fs_sysctl_log);
break;
default:
error = ENOTTY;
break;
}
return (error);
}
/*
* XXX Same structure as FFS inodes? Should we share a common pool?
*/
struct pool ext2fs_inode_pool;
struct pool ext2fs_dinode_pool;
extern u_long ext2gennumber;
void
ext2fs_init(void)
{
pool_init(&ext2fs_inode_pool, sizeof(struct inode), 0, 0, 0,
"ext2fsinopl", &pool_allocator_nointr, IPL_NONE);
pool_init(&ext2fs_dinode_pool, sizeof(struct ext2fs_dinode), 0, 0, 0,
"ext2dinopl", &pool_allocator_nointr, IPL_NONE);
ufs_init();
}
void
ext2fs_reinit(void)
{
ufs_reinit();
}
void
ext2fs_done(void)
{
ufs_done();
pool_destroy(&ext2fs_inode_pool);
pool_destroy(&ext2fs_dinode_pool);
}
/*
* Called by main() when ext2fs is going to be mounted as root.
*
* Name is updated by mount(8) after booting.
*/
#define ROOTNAME "root_device"
int
ext2fs_mountroot(void)
{
extern struct vnode *rootvp;
struct m_ext2fs *fs;
struct mount *mp;
struct ufsmount *ump;
int error;
if (device_class(root_device) != DV_DISK)
return (ENODEV);
if ((error = vfs_rootmountalloc(MOUNT_EXT2FS, "root_device", &mp))) {
vrele(rootvp);
return (error);
}
if ((error = ext2fs_mountfs(rootvp, mp)) != 0) {
vfs_unbusy(mp, false, NULL);
vfs_destroy(mp);
return (error);
}
mutex_enter(&mountlist_lock);
CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
mutex_exit(&mountlist_lock);
ump = VFSTOUFS(mp);
fs = ump->um_e2fs;
memset(fs->e2fs_fsmnt, 0, sizeof(fs->e2fs_fsmnt));
(void) copystr(mp->mnt_stat.f_mntonname, fs->e2fs_fsmnt,
sizeof(fs->e2fs_fsmnt) - 1, 0);
if (fs->e2fs.e2fs_rev > E2FS_REV0) {
memset(fs->e2fs.e2fs_fsmnt, 0, sizeof(fs->e2fs.e2fs_fsmnt));
(void) copystr(mp->mnt_stat.f_mntonname, fs->e2fs.e2fs_fsmnt,
sizeof(fs->e2fs.e2fs_fsmnt) - 1, 0);
}
(void)ext2fs_statvfs(mp, &mp->mnt_stat);
vfs_unbusy(mp, false, NULL);
setrootfstime((time_t)fs->e2fs.e2fs_wtime);
return (0);
}
/*
* VFS Operations.
*
* mount system call
*/
int
ext2fs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
{
struct lwp *l = curlwp;
struct vnode *devvp;
struct ufs_args *args = data;
struct ufsmount *ump = NULL;
struct m_ext2fs *fs;
size_t size;
int error = 0, flags, update;
mode_t accessmode;
if (*data_len < sizeof *args)
return EINVAL;
if (mp->mnt_flag & MNT_GETARGS) {
ump = VFSTOUFS(mp);
if (ump == NULL)
return EIO;
memset(args, 0, sizeof *args);
args->fspec = NULL;
*data_len = sizeof *args;
return 0;
}
update = mp->mnt_flag & MNT_UPDATE;
/* Check arguments */
if (args->fspec != NULL) {
/*
* Look up the name and verify that it's sane.
*/
error = namei_simple_user(args->fspec,
NSM_FOLLOW_NOEMULROOT, &devvp);
if (error != 0)
return (error);
if (!update) {
/*
* Be sure this is a valid block device
*/
if (devvp->v_type != VBLK)
error = ENOTBLK;
else if (bdevsw_lookup(devvp->v_rdev) == NULL)
error = ENXIO;
} else {
/*
* Be sure we're still naming the same device
* used for our initial mount
*/
ump = VFSTOUFS(mp);
if (devvp != ump->um_devvp) {
if (devvp->v_rdev != ump->um_devvp->v_rdev)
error = EINVAL;
else {
vrele(devvp);
devvp = ump->um_devvp;
vref(devvp);
}
}
}
} else {
if (!update) {
/* New mounts must have a filename for the device */
return (EINVAL);
} else {
ump = VFSTOUFS(mp);
devvp = ump->um_devvp;
vref(devvp);
}
}
/*
* If mount by non-root, then verify that user has necessary
* permissions on the device.
*
* Permission to update a mount is checked higher, so here we presume
* updating the mount is okay (for example, as far as securelevel goes)
* which leaves us with the normal check.
*/
if (error == 0) {
accessmode = VREAD;
if (update ?
(mp->mnt_iflag & IMNT_WANTRDWR) != 0 :
(mp->mnt_flag & MNT_RDONLY) == 0)
accessmode |= VWRITE;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp,
KAUTH_ARG(accessmode));
VOP_UNLOCK(devvp);
}
if (error) {
vrele(devvp);
return (error);
}
if (!update) {
int xflags;
if (mp->mnt_flag & MNT_RDONLY)
xflags = FREAD;
else
xflags = FREAD|FWRITE;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_OPEN(devvp, xflags, FSCRED);
VOP_UNLOCK(devvp);
if (error)
goto fail;
error = ext2fs_mountfs(devvp, mp);
if (error) {
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
(void)VOP_CLOSE(devvp, xflags, NOCRED);
VOP_UNLOCK(devvp);
goto fail;
}
ump = VFSTOUFS(mp);
fs = ump->um_e2fs;
} else {
/*
* Update the mount.
*/
/*
* The initial mount got a reference on this
* device, so drop the one obtained via
* namei(), above.
*/
vrele(devvp);
ump = VFSTOUFS(mp);
fs = ump->um_e2fs;
if (fs->e2fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
/*
* Changing from r/w to r/o
*/
flags = WRITECLOSE;
if (mp->mnt_flag & MNT_FORCE)
flags |= FORCECLOSE;
error = ext2fs_flushfiles(mp, flags);
if (error == 0 &&
ext2fs_cgupdate(ump, MNT_WAIT) == 0 &&
(fs->e2fs.e2fs_state & E2FS_ERRORS) == 0) {
fs->e2fs.e2fs_state = E2FS_ISCLEAN;
(void) ext2fs_sbupdate(ump, MNT_WAIT);
}
if (error)
return (error);
fs->e2fs_ronly = 1;
}
if (mp->mnt_flag & MNT_RELOAD) {
error = ext2fs_reload(mp, l->l_cred, l);
if (error)
return (error);
}
if (fs->e2fs_ronly && (mp->mnt_iflag & IMNT_WANTRDWR)) {
/*
* Changing from read-only to read/write
*/
fs->e2fs_ronly = 0;
if (fs->e2fs.e2fs_state == E2FS_ISCLEAN)
fs->e2fs.e2fs_state = 0;
else
fs->e2fs.e2fs_state = E2FS_ERRORS;
fs->e2fs_fmod = 1;
}
if (args->fspec == NULL)
return 0;
}
error = set_statvfs_info(path, UIO_USERSPACE, args->fspec,
UIO_USERSPACE, mp->mnt_op->vfs_name, mp, l);
(void) copystr(mp->mnt_stat.f_mntonname, fs->e2fs_fsmnt,
sizeof(fs->e2fs_fsmnt) - 1, &size);
memset(fs->e2fs_fsmnt + size, 0, sizeof(fs->e2fs_fsmnt) - size);
if (fs->e2fs.e2fs_rev > E2FS_REV0) {
(void) copystr(mp->mnt_stat.f_mntonname, fs->e2fs.e2fs_fsmnt,
sizeof(fs->e2fs.e2fs_fsmnt) - 1, &size);
memset(fs->e2fs.e2fs_fsmnt, 0,
sizeof(fs->e2fs.e2fs_fsmnt) - size);
}
if (fs->e2fs_fmod != 0) { /* XXX */
fs->e2fs_fmod = 0;
if (fs->e2fs.e2fs_state == 0)
fs->e2fs.e2fs_wtime = time_second;
else
printf("%s: file system not clean; please fsck(8)\n",
mp->mnt_stat.f_mntfromname);
(void) ext2fs_cgupdate(ump, MNT_WAIT);
}
return (error);
fail:
vrele(devvp);
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) re-read summary information from disk.
* 4) invalidate all inactive vnodes.
* 5) invalidate all cached file data.
* 6) re-read inode data for all active vnodes.
*/
int
ext2fs_reload(struct mount *mp, kauth_cred_t cred, struct lwp *l)
{
struct vnode *vp, *mvp, *devvp;
struct inode *ip;
struct buf *bp;
struct m_ext2fs *fs;
struct ext2fs *newfs;
int i, error;
void *cp;
struct ufsmount *ump;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
return (EINVAL);
ump = VFSTOUFS(mp);
/*
* Step 1: invalidate all cached meta-data.
*/
devvp = ump->um_devvp;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
error = vinvalbuf(devvp, 0, cred, l, 0, 0);
VOP_UNLOCK(devvp);
if (error)
panic("ext2fs_reload: dirty1");
/*
* Step 2: re-read superblock from disk.
*/
error = bread(devvp, SBLOCK, SBSIZE, NOCRED, 0, &bp);
if (error) {
brelse(bp, 0);
return (error);
}
newfs = (struct ext2fs *)bp->b_data;
error = ext2fs_checksb(newfs, (mp->mnt_flag & MNT_RDONLY) != 0);
if (error) {
brelse(bp, 0);
return (error);
}
fs = ump->um_e2fs;
/*
* copy in new superblock, and compute in-memory values
*/
e2fs_sbload(newfs, &fs->e2fs);
fs->e2fs_ncg =
howmany(fs->e2fs.e2fs_bcount - fs->e2fs.e2fs_first_dblock,
fs->e2fs.e2fs_bpg);
fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + LOG_MINBSIZE - DEV_BSHIFT;
fs->e2fs_bsize = MINBSIZE << fs->e2fs.e2fs_log_bsize;
fs->e2fs_bshift = LOG_MINBSIZE + fs->e2fs.e2fs_log_bsize;
fs->e2fs_qbmask = fs->e2fs_bsize - 1;
fs->e2fs_bmask = ~fs->e2fs_qbmask;
fs->e2fs_ngdb =
howmany(fs->e2fs_ncg, fs->e2fs_bsize / sizeof(struct ext2_gd));
fs->e2fs_ipb = fs->e2fs_bsize / EXT2_DINODE_SIZE(fs);
fs->e2fs_itpg = fs->e2fs.e2fs_ipg / fs->e2fs_ipb;
brelse(bp, 0);
/*
* Step 3: re-read summary information from disk.
*/
for (i = 0; i < fs->e2fs_ngdb; i++) {
error = bread(devvp ,
fsbtodb(fs, fs->e2fs.e2fs_first_dblock +
1 /* superblock */ + i),
fs->e2fs_bsize, NOCRED, 0, &bp);
if (error) {
brelse(bp, 0);
return (error);
}
e2fs_cgload((struct ext2_gd *)bp->b_data,
&fs->e2fs_gd[i * fs->e2fs_bsize / sizeof(struct ext2_gd)],
fs->e2fs_bsize);
brelse(bp, 0);
}
/* Allocate a marker vnode. */
mvp = vnalloc(mp);
/*
* NOTE: not using the TAILQ_FOREACH here since in this loop vgone()
* and vclean() can be called indirectly
*/
mutex_enter(&mntvnode_lock);
loop:
for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) {
vmark(mvp, vp);
if (vp->v_mount != mp || vismarker(vp))
continue;
/*
* Step 4: invalidate all inactive vnodes.
*/
if (vrecycle(vp, &mntvnode_lock, l)) {
mutex_enter(&mntvnode_lock);
(void)vunmark(mvp);
goto loop;
}
/*
* Step 5: invalidate all cached file data.
*/
mutex_enter(vp->v_interlock);
mutex_exit(&mntvnode_lock);
if (vget(vp, LK_EXCLUSIVE)) {
mutex_enter(&mntvnode_lock);
(void)vunmark(mvp);
goto loop;
}
if (vinvalbuf(vp, 0, cred, l, 0, 0))
panic("ext2fs_reload: dirty2");
/*
* Step 6: 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, 0, &bp);
if (error) {
vput(vp);
mutex_enter(&mntvnode_lock);
(void)vunmark(mvp);
break;
}
cp = (char *)bp->b_data +
(ino_to_fsbo(fs, ip->i_number) * EXT2_DINODE_SIZE(fs));
e2fs_iload((struct ext2fs_dinode *)cp, ip->i_din.e2fs_din);
ext2fs_set_inode_guid(ip);
brelse(bp, 0);
vput(vp);
mutex_enter(&mntvnode_lock);
}
mutex_exit(&mntvnode_lock);
vnfree(mvp);
return (error);
}
/*
* Common code for mount and mountroot
*/
int
ext2fs_mountfs(struct vnode *devvp, struct mount *mp)
{
struct lwp *l = curlwp;
struct ufsmount *ump;
struct buf *bp;
struct ext2fs *fs;
struct m_ext2fs *m_fs;
dev_t dev;
int error, i, ronly;
kauth_cred_t cred;
struct proc *p;
dev = devvp->v_rdev;
p = l ? l->l_proc : NULL;
cred = l ? l->l_cred : NOCRED;
/* Flush out any old buffers remaining from a previous use. */
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0);
VOP_UNLOCK(devvp);
if (error)
return (error);
ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
bp = NULL;
ump = NULL;
#ifdef DEBUG_EXT2
printf("ext2 sb size: %zu\n", sizeof(struct ext2fs));
#endif
error = bread(devvp, SBLOCK, SBSIZE, cred, 0, &bp);
if (error)
goto out;
fs = (struct ext2fs *)bp->b_data;
error = ext2fs_checksb(fs, ronly);
if (error)
goto out;
ump = kmem_zalloc(sizeof(*ump), KM_SLEEP);
ump->um_fstype = UFS1;
ump->um_ops = &ext2fs_ufsops;
ump->um_e2fs = kmem_zalloc(sizeof(struct m_ext2fs), KM_SLEEP);
e2fs_sbload((struct ext2fs *)bp->b_data, &ump->um_e2fs->e2fs);
brelse(bp, 0);
bp = NULL;
m_fs = ump->um_e2fs;
m_fs->e2fs_ronly = ronly;
#ifdef DEBUG_EXT2
printf("ext2 ino size %zu\n", EXT2_DINODE_SIZE(m_fs));
#endif
if (ronly == 0) {
if (m_fs->e2fs.e2fs_state == E2FS_ISCLEAN)
m_fs->e2fs.e2fs_state = 0;
else
m_fs->e2fs.e2fs_state = E2FS_ERRORS;
m_fs->e2fs_fmod = 1;
}
/* compute dynamic sb infos */
m_fs->e2fs_ncg =
howmany(m_fs->e2fs.e2fs_bcount - m_fs->e2fs.e2fs_first_dblock,
m_fs->e2fs.e2fs_bpg);
m_fs->e2fs_fsbtodb = m_fs->e2fs.e2fs_log_bsize + LOG_MINBSIZE - DEV_BSHIFT;
m_fs->e2fs_bsize = MINBSIZE << m_fs->e2fs.e2fs_log_bsize;
m_fs->e2fs_bshift = LOG_MINBSIZE + m_fs->e2fs.e2fs_log_bsize;
m_fs->e2fs_qbmask = m_fs->e2fs_bsize - 1;
m_fs->e2fs_bmask = ~m_fs->e2fs_qbmask;
m_fs->e2fs_ngdb =
howmany(m_fs->e2fs_ncg, m_fs->e2fs_bsize / sizeof(struct ext2_gd));
m_fs->e2fs_ipb = m_fs->e2fs_bsize / EXT2_DINODE_SIZE(m_fs);
m_fs->e2fs_itpg = m_fs->e2fs.e2fs_ipg / m_fs->e2fs_ipb;
m_fs->e2fs_gd = kmem_alloc(m_fs->e2fs_ngdb * m_fs->e2fs_bsize, KM_SLEEP);
for (i = 0; i < m_fs->e2fs_ngdb; i++) {
error = bread(devvp ,
fsbtodb(m_fs, m_fs->e2fs.e2fs_first_dblock +
1 /* superblock */ + i),
m_fs->e2fs_bsize, NOCRED, 0, &bp);
if (error) {
kmem_free(m_fs->e2fs_gd,
m_fs->e2fs_ngdb * m_fs->e2fs_bsize);
goto out;
}
e2fs_cgload((struct ext2_gd *)bp->b_data,
&m_fs->e2fs_gd[
i * m_fs->e2fs_bsize / sizeof(struct ext2_gd)],
m_fs->e2fs_bsize);
brelse(bp, 0);
bp = NULL;
}
if (m_fs->e2fs.e2fs_misc_flags & E2FS_UNSIGNED_HASH) {
m_fs->e2fs_uhash = 3;
} else if ((m_fs->e2fs.e2fs_misc_flags & E2FS_SIGNED_HASH) == 0) {
#ifdef __CHAR_UNSIGNED__
m_fs->e2fs.e2fs_misc_flags |= h2fs32(E2FS_UNSIGNED_HASH);
m_fs->e2fs_uhash = 3;
#else
m_fs->e2fs.e2fs_misc_flags |= h2fs32(E2FS_SIGNED_HASH);
#endif
}
mp->mnt_data = ump;
mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev;
mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_EXT2FS);
mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
mp->mnt_stat.f_namemax = EXT2FS_MAXNAMLEN;
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_dev_bshift = DEV_BSHIFT; /* XXX */
mp->mnt_fs_bshift = m_fs->e2fs_bshift;
mp->mnt_iflag |= IMNT_DTYPE;
ump->um_flags = 0;
ump->um_mountp = mp;
ump->um_dev = dev;
ump->um_devvp = devvp;
ump->um_nindir = NINDIR(m_fs);
ump->um_lognindir = ffs(NINDIR(m_fs)) - 1;
ump->um_bptrtodb = m_fs->e2fs_fsbtodb;
ump->um_seqinc = 1; /* no frags */
ump->um_maxsymlinklen = EXT2_MAXSYMLINKLEN;
ump->um_dirblksiz = m_fs->e2fs_bsize;
ump->um_maxfilesize = ((uint64_t)0x80000000 * m_fs->e2fs_bsize - 1);
devvp->v_specmountpoint = mp;
return (0);
out:
KASSERT(bp != NULL);
brelse(bp, 0);
if (ump) {
kmem_free(ump->um_e2fs, sizeof(struct m_ext2fs));
kmem_free(ump, sizeof(*ump));
mp->mnt_data = NULL;
}
return (error);
}
/*
* unmount system call
*/
int
ext2fs_unmount(struct mount *mp, int mntflags)
{
struct ufsmount *ump;
struct m_ext2fs *fs;
int error, flags;
flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
if ((error = ext2fs_flushfiles(mp, flags)) != 0)
return (error);
ump = VFSTOUFS(mp);
fs = ump->um_e2fs;
if (fs->e2fs_ronly == 0 &&
ext2fs_cgupdate(ump, MNT_WAIT) == 0 &&
(fs->e2fs.e2fs_state & E2FS_ERRORS) == 0) {
fs->e2fs.e2fs_state = E2FS_ISCLEAN;
(void) ext2fs_sbupdate(ump, MNT_WAIT);
}
if (ump->um_devvp->v_type != VBAD)
ump->um_devvp->v_specmountpoint = NULL;
vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_CLOSE(ump->um_devvp, fs->e2fs_ronly ? FREAD : FREAD|FWRITE,
NOCRED);
vput(ump->um_devvp);
kmem_free(fs->e2fs_gd, fs->e2fs_ngdb * fs->e2fs_bsize);
kmem_free(fs, sizeof(*fs));
kmem_free(ump, sizeof(*ump));
mp->mnt_data = NULL;
mp->mnt_flag &= ~MNT_LOCAL;
return (error);
}
/*
* Flush out all the files in a filesystem.
*/
int
ext2fs_flushfiles(struct mount *mp, int flags)
{
extern int doforce;
int error;
if (!doforce)
flags &= ~FORCECLOSE;
error = vflush(mp, NULLVP, flags);
return (error);
}
/*
* Get file system statistics.
*/
int
ext2fs_statvfs(struct mount *mp, struct statvfs *sbp)
{
struct ufsmount *ump;
struct m_ext2fs *fs;
uint32_t overhead, overhead_per_group, ngdb;
int i, ngroups;
ump = VFSTOUFS(mp);
fs = ump->um_e2fs;
if (fs->e2fs.e2fs_magic != E2FS_MAGIC)
panic("ext2fs_statvfs");
/*
* Compute the overhead (FS structures)
*/
overhead_per_group =
1 /* block bitmap */ +
1 /* inode bitmap */ +
fs->e2fs_itpg;
overhead = fs->e2fs.e2fs_first_dblock +
fs->e2fs_ncg * overhead_per_group;
if (fs->e2fs.e2fs_rev > E2FS_REV0 &&
fs->e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_SPARSESUPER) {
for (i = 0, ngroups = 0; i < fs->e2fs_ncg; i++) {
if (cg_has_sb(i))
ngroups++;
}
} else {
ngroups = fs->e2fs_ncg;
}
ngdb = fs->e2fs_ngdb;
if (fs->e2fs.e2fs_rev > E2FS_REV0 &&
fs->e2fs.e2fs_features_compat & EXT2F_COMPAT_RESIZE)
ngdb += fs->e2fs.e2fs_reserved_ngdb;
overhead += ngroups * (1 /* superblock */ + ngdb);
sbp->f_bsize = fs->e2fs_bsize;
sbp->f_frsize = MINBSIZE << fs->e2fs.e2fs_fsize;
sbp->f_iosize = fs->e2fs_bsize;
sbp->f_blocks = fs->e2fs.e2fs_bcount - overhead;
sbp->f_bfree = fs->e2fs.e2fs_fbcount;
sbp->f_bresvd = fs->e2fs.e2fs_rbcount;
if (sbp->f_bfree > sbp->f_bresvd)
sbp->f_bavail = sbp->f_bfree - sbp->f_bresvd;
else
sbp->f_bavail = 0;
sbp->f_files = fs->e2fs.e2fs_icount;
sbp->f_ffree = fs->e2fs.e2fs_ficount;
sbp->f_favail = fs->e2fs.e2fs_ficount;
sbp->f_fresvd = 0;
copy_statvfs_info(sbp, mp);
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'.
*/
int
ext2fs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
{
struct vnode *vp, *mvp;
struct inode *ip;
struct ufsmount *ump = VFSTOUFS(mp);
struct m_ext2fs *fs;
int error, allerror = 0;
fs = ump->um_e2fs;
if (fs->e2fs_fmod != 0 && fs->e2fs_ronly != 0) { /* XXX */
printf("fs = %s\n", fs->e2fs_fsmnt);
panic("update: rofs mod");
}
/* Allocate a marker vnode. */
mvp = vnalloc(mp);
/*
* Write back each (modified) inode.
*/
mutex_enter(&mntvnode_lock);
loop:
/*
* NOTE: not using the TAILQ_FOREACH here since in this loop vgone()
* and vclean() can be called indirectly
*/
for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) {
vmark(mvp, vp);
if (vp->v_mount != mp || vismarker(vp))
continue;
mutex_enter(vp->v_interlock);
ip = VTOI(vp);
if (ip == NULL || (vp->v_iflag & (VI_XLOCK|VI_CLEAN)) != 0 ||
vp->v_type == VNON ||
((ip->i_flag &
(IN_CHANGE | IN_UPDATE | IN_MODIFIED)) == 0 &&
LIST_EMPTY(&vp->v_dirtyblkhd) &&
UVM_OBJ_IS_CLEAN(&vp->v_uobj)))
{
mutex_exit(vp->v_interlock);
continue;
}
mutex_exit(&mntvnode_lock);
error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT);
if (error) {
mutex_enter(&mntvnode_lock);
if (error == ENOENT) {
mutex_enter(&mntvnode_lock);
(void)vunmark(mvp);
goto loop;
}
continue;
}
if (vp->v_type == VREG && waitfor == MNT_LAZY)
error = ext2fs_update(vp, NULL, NULL, 0);
else
error = VOP_FSYNC(vp, cred,
waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0);
if (error)
allerror = error;
vput(vp);
mutex_enter(&mntvnode_lock);
}
mutex_exit(&mntvnode_lock);
vnfree(mvp);
/*
* Force stale file system 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, cred,
waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 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 = time_second;
if ((error = ext2fs_cgupdate(ump, waitfor)))
allerror = error;
}
return (allerror);
}