/* $OpenBSD: ext2fs_vfsops.c,v 1.48 2007/06/17 20:15:25 jasper Exp $ */
/* $NetBSD: ext2fs_vfsops.c,v 1.1 1997/06/11 09:34:07 bouyer Exp $ */
/*
* Copyright (c) 1997 Manuel Bouyer.
* 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.
*/
#include <sys/param.h>
#include <sys/systm.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 <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_extern.h>
extern struct lock ufs_hashlock;
int ext2fs_sbupdate(struct ufsmount *, int);
static int ext2fs_checksb(struct ext2fs *, int);
extern struct vnodeopv_desc ext2fs_vnodeop_opv_desc;
extern struct vnodeopv_desc ext2fs_specop_opv_desc;
#ifdef FIFO
extern struct vnodeopv_desc ext2fs_fifoop_opv_desc;
#endif
struct vnodeopv_desc *ext2fs_vnodeopv_descs[] = {
&ext2fs_vnodeop_opv_desc,
&ext2fs_specop_opv_desc,
#ifdef FIFO
&ext2fs_fifoop_opv_desc,
#endif
NULL,
};
const struct vfsops ext2fs_vfsops = {
ext2fs_mount,
ufs_start,
ext2fs_unmount,
ufs_root,
ufs_quotactl,
ext2fs_statfs,
ext2fs_sync,
ext2fs_vget,
ext2fs_fhtovp,
ext2fs_vptofh,
ext2fs_init,
ext2fs_sysctl,
ufs_check_export
};
struct pool ext2fs_inode_pool;
struct pool ext2fs_dinode_pool;
extern u_long ext2gennumber;
int
ext2fs_init(struct vfsconf *vfsp)
{
pool_init(&ext2fs_inode_pool, sizeof(struct inode), 0, 0, 0,
"ext2inopl", &pool_allocator_nointr);
pool_init(&ext2fs_dinode_pool, sizeof(struct ext2fs_dinode), 0, 0, 0,
"ext2dinopl", &pool_allocator_nointr);
return (ufs_init(vfsp));
}
/*
* 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)
{
struct m_ext2fs *fs;
struct mount *mp;
struct proc *p = curproc; /* XXX */
struct ufsmount *ump;
int error;
/*
* Get vnodes for swapdev and rootdev.
*/
if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp))
panic("ext2fs_mountroot: can't setup bdevvp's");
if ((error = vfs_rootmountalloc("ext2fs", "root_device", &mp)) != 0) {
vrele(rootvp);
return (error);
}
if ((error = ext2fs_mountfs(rootvp, mp, p)) != 0) {
mp->mnt_vfc->vfc_refcount--;
vfs_unbusy(mp);
free(mp, M_MOUNT);
vrele(rootvp);
return (error);
}
CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
ump = VFSTOUFS(mp);
fs = ump->um_e2fs;
bzero(fs->e2fs_fsmnt, 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) {
bzero(fs->e2fs.e2fs_fsmnt, 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_statfs(mp, &mp->mnt_stat, p);
vfs_unbusy(mp);
inittodr(fs->e2fs.e2fs_wtime);
return (0);
}
/*
* VFS Operations.
*
* mount system call
*/
int
ext2fs_mount(struct mount *mp, const char *path, void *data,
struct nameidata *ndp, struct proc *p)
{
struct vnode *devvp;
struct ufs_args args;
struct ufsmount *ump = NULL;
struct m_ext2fs *fs;
size_t size;
int error, flags;
mode_t accessmode;
error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args));
if (error)
return (error);
/*
* 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 = VFSTOUFS(mp);
fs = ump->um_e2fs;
if (fs->e2fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
flags = WRITECLOSE;
if (mp->mnt_flag & MNT_FORCE)
flags |= FORCECLOSE;
error = ext2fs_flushfiles(mp, flags, p);
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, ndp->ni_cnd.cn_cred, p);
if (error)
return (error);
}
if (fs->e2fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) {
/*
* If upgrade to read-write by non-root, then verify
* that user has necessary permissions on the device.
*/
if (p->p_ucred->cr_uid != 0) {
devvp = ump->um_devvp;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
error = VOP_ACCESS(devvp, VREAD | VWRITE,
p->p_ucred, p);
if (error) {
VOP_UNLOCK(devvp, 0, p);
return (error);
}
VOP_UNLOCK(devvp, 0, p);
}
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 == 0) {
/*
* Process export requests.
*/
return (vfs_export(mp, &ump->um_export,
&args.export_info));
}
}
/*
* Not an update, or updating the name: look up the name
* and verify that it refers to a sensible block device.
*/
NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
if ((error = namei(ndp)) != 0)
return (error);
devvp = ndp->ni_vp;
if (devvp->v_type != VBLK) {
vrele(devvp);
return (ENOTBLK);
}
if (major(devvp->v_rdev) >= nblkdev) {
vrele(devvp);
return (ENXIO);
}
/*
* If mount by non-root, then verify that user has necessary
* permissions on the device.
*/
if (p->p_ucred->cr_uid != 0) {
accessmode = VREAD;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
accessmode |= VWRITE;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p);
if (error) {
vput(devvp);
return (error);
}
VOP_UNLOCK(devvp, 0, p);
}
if ((mp->mnt_flag & MNT_UPDATE) == 0)
error = ext2fs_mountfs(devvp, mp, p);
else {
if (devvp != ump->um_devvp)
error = EINVAL; /* XXX needs translation */
else
vrele(devvp);
}
if (error) {
vrele(devvp);
return (error);
}
ump = VFSTOUFS(mp);
fs = ump->um_e2fs;
(void) copyinstr(path, fs->e2fs_fsmnt, sizeof(fs->e2fs_fsmnt) - 1,
&size);
bzero(fs->e2fs_fsmnt + size, 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);
bzero(fs->e2fs.e2fs_fsmnt, sizeof(fs->e2fs.e2fs_fsmnt) - size);
}
bcopy(fs->e2fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
(void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
&size);
bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - 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 (0);
}
int ext2fs_reload_vnode(struct vnode *, void *args);
struct ext2fs_reload_args {
struct m_ext2fs *fs;
struct proc *p;
struct ucred *cred;
struct vnode *devvp;
};
int
ext2fs_reload_vnode(struct vnode *vp, void *args)
{
struct ext2fs_reload_args *era = args;
struct buf *bp;
struct inode *ip;
int error;
caddr_t cp;
/*
* Step 4: invalidate all inactive vnodes.
*/
if (vp->v_usecount == 0) {
vgonel(vp, era->p);
return (0);
}
/*
* Step 5: invalidate all cached file data.
*/
if (vget(vp, LK_EXCLUSIVE, era->p))
return (0);
if (vinvalbuf(vp, 0, era->cred, era->p, 0, 0))
panic("ext2fs_reload: dirty2");
/*
* Step 6: re-read inode data for all active vnodes.
*/
ip = VTOI(vp);
error = bread(era->devvp,
fsbtodb(era->fs, ino_to_fsba(era->fs, ip->i_number)),
(int)era->fs->e2fs_bsize, NOCRED, &bp);
if (error) {
vput(vp);
return (error);
}
cp = (caddr_t)bp->b_data +
(ino_to_fsbo(era->fs, ip->i_number) * EXT2_DINODE_SIZE);
e2fs_iload((struct ext2fs_dinode *)cp, ip->i_e2din);
brelse(bp);
vput(vp);
return (0);
}
/*
* 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 *mountp, struct ucred *cred, struct proc *p)
{
struct vnode *devvp;
struct buf *bp;
struct m_ext2fs *fs;
struct ext2fs *newfs;
struct partinfo dpart;
int i, size, error;
struct ext2fs_reload_args era;
if ((mountp->mnt_flag & MNT_RDONLY) == 0)
return (EINVAL);
/*
* Step 1: invalidate all cached meta-data.
*/
devvp = VFSTOUFS(mountp)->um_devvp;
if (vinvalbuf(devvp, 0, cred, p, 0, 0))
panic("ext2fs_reload: dirty1");
/*
* Step 2: re-read superblock from disk.
*/
if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0)
size = DEV_BSIZE;
else
size = dpart.disklab->d_secsize;
error = bread(devvp, (int32_t)(SBOFF / size), SBSIZE, NOCRED, &bp);
if (error) {
brelse(bp);
return (error);
}
newfs = (struct ext2fs *)bp->b_data;
error = ext2fs_checksb(newfs, (mountp->mnt_flag & MNT_RDONLY) != 0);
if (error) {
brelse(bp);
return (error);
}
fs = VFSTOUFS(mountp)->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);
/* XXX assume hw bsize = 512 */
fs->e2fs_fsbtodb = fs->e2fs.e2fs_log_bsize + 1;
fs->e2fs_bsize = 1024 << 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->e2fs_itpg = fs->e2fs.e2fs_ipg/fs->e2fs_ipb;
/*
* Step 3: re-read summary information from disk.
*/
for (i=0; i < fs->e2fs_ngdb; i++) {
error = bread(devvp ,
fsbtodb(fs, ((fs->e2fs_bsize>1024)? 0 : 1) + i + 1),
fs->e2fs_bsize, NOCRED, &bp);
if (error) {
brelse(bp);
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);
}
era.p = p;
era.cred = cred;
era.fs = fs;
era.devvp = devvp;
error = vfs_mount_foreach_vnode(mountp, ext2fs_reload_vnode, &era);
return (error);
}
/*
* Common code for mount and mountroot
*/
int
ext2fs_mountfs(struct vnode *devvp, struct mount *mp, struct proc *p)
{
struct ufsmount *ump;
struct buf *bp;
struct ext2fs *fs;
struct m_ext2fs *m_fs;
dev_t dev;
struct partinfo dpart;
int error, i, size, ronly;
struct ucred *cred;
dev = devvp->v_rdev;
cred = p ? p->p_ucred : NOCRED;
/*
* Disallow multiple mounts of the same device.
* Disallow mounting of a device that is currently in use
* (except for root, which might share swap device for miniroot).
* Flush out any old buffers remaining from a previous use.
*/
if ((error = vfs_mountedon(devvp)) != 0)
return (error);
if (vcount(devvp) > 1 && devvp != rootvp)
return (EBUSY);
if ((error = vinvalbuf(devvp, V_SAVE, cred, p, 0, 0)) != 0)
return (error);
ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p);
if (error)
return (error);
if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, cred, p) != 0)
size = DEV_BSIZE;
else
size = dpart.disklab->d_secsize;
bp = NULL;
ump = NULL;
#ifdef DEBUG_EXT2
printf("sb size: %d ino size %d\n", sizeof(struct ext2fs),
EXT2_DINODE_SIZE);
#endif
error = bread(devvp, (SBOFF / DEV_BSIZE), SBSIZE, cred, &bp);
if (error)
goto out;
fs = (struct ext2fs *)bp->b_data;
error = ext2fs_checksb(fs, ronly);
if (error)
goto out;
ump = malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
memset((caddr_t)ump, 0, sizeof *ump);
ump->um_e2fs = malloc(sizeof(struct m_ext2fs), M_UFSMNT, M_WAITOK);
memset((caddr_t)ump->um_e2fs, 0, sizeof(struct m_ext2fs));
e2fs_sbload((struct ext2fs*)bp->b_data, &ump->um_e2fs->e2fs);
brelse(bp);
bp = NULL;
m_fs = ump->um_e2fs;
m_fs->e2fs_ronly = ronly;
ump->um_fstype = UM_EXT2FS;
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);
/* XXX assume hw bsize = 512 */
m_fs->e2fs_fsbtodb = m_fs->e2fs.e2fs_log_bsize + 1;
m_fs->e2fs_bsize = 1024 << 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->e2fs_itpg = m_fs->e2fs.e2fs_ipg/m_fs->e2fs_ipb;
m_fs->e2fs_gd = malloc(m_fs->e2fs_ngdb * m_fs->e2fs_bsize,
M_UFSMNT, M_WAITOK);
for (i=0; i < m_fs->e2fs_ngdb; i++) {
error = bread(devvp ,
fsbtodb(m_fs, ((m_fs->e2fs_bsize>1024)? 0 : 1) + i + 1),
m_fs->e2fs_bsize, NOCRED, &bp);
if (error) {
free(m_fs->e2fs_gd, M_UFSMNT);
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);
bp = NULL;
}
mp->mnt_data = (qaddr_t)ump;
mp->mnt_stat.f_fsid.val[0] = (long)dev;
mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
mp->mnt_flag |= MNT_LOCAL;
ump->um_mountp = mp;
ump->um_dev = dev;
ump->um_devvp = devvp;
ump->um_nindir = NINDIR(m_fs);
ump->um_bptrtodb = m_fs->e2fs_fsbtodb;
ump->um_seqinc = 1; /* no frags */
devvp->v_specmountpoint = mp;
return (0);
out:
if (bp)
brelse(bp);
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
(void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, cred, p);
VOP_UNLOCK(devvp, 0, p);
if (ump) {
free(ump->um_e2fs, M_UFSMNT);
free(ump, M_UFSMNT);
mp->mnt_data = (qaddr_t)0;
}
return (error);
}
/*
* unmount system call
*/
int
ext2fs_unmount(struct mount *mp, int mntflags, struct proc *p)
{
struct ufsmount *ump;
struct m_ext2fs *fs;
int error, flags;
flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
if ((error = ext2fs_flushfiles(mp, flags, p)) != 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, p);
error = VOP_CLOSE(ump->um_devvp, fs->e2fs_ronly ? FREAD : FREAD|FWRITE,
NOCRED, p);
vput(ump->um_devvp);
free(fs->e2fs_gd, M_UFSMNT);
free(fs, M_UFSMNT);
free(ump, M_UFSMNT);
mp->mnt_data = (qaddr_t)0;
mp->mnt_flag &= ~MNT_LOCAL;
return (error);
}
/*
* Flush out all the files in a filesystem.
*/
int
ext2fs_flushfiles(struct mount *mp, int flags, struct proc *p)
{
struct ufsmount *ump;
int error;
ump = VFSTOUFS(mp);
/*
* Flush all the files.
*/
if ((error = vflush(mp, NULL, flags)) != 0)
return (error);
/*
* Flush filesystem metadata.
*/
vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, p);
error = VOP_FSYNC(ump->um_devvp, p->p_ucred, MNT_WAIT, p);
VOP_UNLOCK(ump->um_devvp, 0, p);
return (error);
}
/*
* Get file system statistics.
*/
int
ext2fs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p)
{
struct ufsmount *ump;
struct m_ext2fs *fs;
u_int32_t overhead, overhead_per_group;
int i, ngroups;
ump = VFSTOUFS(mp);
fs = ump->um_e2fs;
if (fs->e2fs.e2fs_magic != E2FS_MAGIC)
panic("ext2fs_statfs");
/*
* 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;
}
overhead += ngroups * (1 + fs->e2fs_ngdb);
sbp->f_bsize = fs->e2fs_bsize;
sbp->f_iosize = fs->e2fs_bsize;
sbp->f_blocks = fs->e2fs.e2fs_bcount - overhead;
sbp->f_bfree = fs->e2fs.e2fs_fbcount;
sbp->f_bavail = sbp->f_bfree - fs->e2fs.e2fs_rbcount;
sbp->f_files = fs->e2fs.e2fs_icount;
sbp->f_ffree = fs->e2fs.e2fs_ficount;
if (sbp != &mp->mnt_stat) {
bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
}
strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
return (0);
}
int ext2fs_sync_vnode(struct vnode *vp, void *);
struct ext2fs_sync_args {
int allerror;
int waitfor;
struct proc *p;
struct ucred *cred;
};
int
ext2fs_sync_vnode(struct vnode *vp, void *args)
{
struct ext2fs_sync_args *esa = args;
struct inode *ip;
int error;
ip = VTOI(vp);
if (vp->v_type == VNON ||
((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
LIST_EMPTY(&vp->v_dirtyblkhd)) ||
esa->waitfor == MNT_LAZY) {
return (0);
}
if (vget(vp, LK_EXCLUSIVE | LK_NOWAIT, esa->p))
return (0);
if ((error = VOP_FSYNC(vp, esa->cred, esa->waitfor, esa->p)) != 0)
esa->allerror = error;
vput(vp);
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.
*
* Should always be called with the mount point locked.
*/
int
ext2fs_sync(struct mount *mp, int waitfor, struct ucred *cred, struct proc *p)
{
struct ufsmount *ump = VFSTOUFS(mp);
struct m_ext2fs *fs;
int error, allerror = 0;
struct ext2fs_sync_args esa;
fs = ump->um_e2fs;
if (fs->e2fs_ronly != 0) { /* XXX */
printf("fs = %s\n", fs->e2fs_fsmnt);
panic("update: rofs mod");
}
/*
* Write back each (modified) inode.
*/
esa.p = p;
esa.cred = cred;
esa.allerror = 0;
esa.waitfor = waitfor;
vfs_mount_foreach_vnode(mp, ext2fs_sync_vnode, &esa);
if (esa.allerror != 0)
allerror = esa.allerror;
/*
* Force stale file system control information to be flushed.
*/
if (waitfor != MNT_LAZY) {
vn_lock(ump->um_devvp, LK_EXCLUSIVE | LK_RETRY, p);
if ((error = VOP_FSYNC(ump->um_devvp, cred, waitfor, p)) != 0)
allerror = error;
VOP_UNLOCK(ump->um_devvp, 0, p);
}
/*
* 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);
}
/*
* Look up a 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.
*/
int
ext2fs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
{
struct m_ext2fs *fs;
struct inode *ip;
struct ext2fs_dinode *dp;
struct ufsmount *ump;
struct buf *bp;
struct vnode *vp;
dev_t dev;
int error;
ump = VFSTOUFS(mp);
dev = ump->um_dev;
retry:
if ((*vpp = ufs_ihashget(dev, ino)) != NULL)
return (0);
/* Allocate a new vnode/inode. */
if ((error = getnewvnode(VT_EXT2FS, mp, ext2fs_vnodeop_p, &vp)) != 0) {
*vpp = NULL;
return (error);
}
ip = pool_get(&ext2fs_inode_pool, PR_WAITOK);
memset(ip, 0, sizeof(struct inode));
lockinit(&ip->i_lock, PINOD, "inode", 0, 0);
vp->v_data = ip;
ip->i_vnode = vp;
ip->i_ump = ump;
ip->i_e2fs = fs = ump->um_e2fs;
ip->i_dev = dev;
ip->i_number = ino;
ip->i_e2fs_last_lblk = 0;
ip->i_e2fs_last_blk = 0;
/*
* Put it onto its hash chain and lock it so that other requests for
* this inode will block if they arrive while we are sleeping waiting
* for old data structures to be purged or for the contents of the
* disk portion of this inode to be read.
*/
error = ufs_ihashins(ip);
if (error) {
vrele(vp);
if (error == EEXIST)
goto retry;
return (error);
}
/* Read in the disk contents for the inode, copy into the inode. */
error = bread(ump->um_devvp, fsbtodb(fs, ino_to_fsba(fs, ino)),
(int)fs->e2fs_bsize, NOCRED, &bp);
if (error) {
/*
* 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().
*/
vput(vp);
brelse(bp);
*vpp = NULL;
return (error);
}
dp = (struct ext2fs_dinode *) bp->b_data + ino_to_fsbo(fs, ino);
ip->i_e2din = pool_get(&ext2fs_dinode_pool, PR_WAITOK);
e2fs_iload(dp, ip->i_e2din);
brelse(bp);
ip->i_effnlink = ip->i_e2fs_nlink;
/*
* The fields for storing the UID and GID of an ext2fs inode are
* limited to 16 bits. To overcome this limitation, Linux decided to
* scatter the highest bits of these values into a previously reserved
* area on the disk inode. We deal with this situation by having two
* 32-bit fields *out* of the disk inode to hold the complete values.
* Now that we are reading in the inode, compute these fields.
*/
ip->i_e2fs_uid = ip->i_e2fs_uid_low | (ip->i_e2fs_uid_high << 16);
ip->i_e2fs_gid = ip->i_e2fs_gid_low | (ip->i_e2fs_gid_high << 16);
/* If the inode was deleted, reset all fields */
if (ip->i_e2fs_dtime != 0) {
ip->i_e2fs_mode = ip->i_e2fs_nblock = 0;
(void)ext2fs_setsize(ip, 0);
}
/*
* Initialize the vnode from the inode, check for aliases.
* Note that the underlying vnode may have changed.
*/
error = ext2fs_vinit(mp, ext2fs_specop_p, EXT2FS_FIFOOPS, &vp);
if (error) {
vput(vp);
*vpp = NULL;
return (error);
}
/*
* Finish inode initialization now that aliasing has been resolved.
*/
VREF(ip->i_devvp);
/*
* Set up a generation number for this inode if it does not
* already have one. This should only happen on old filesystems.
*/
if (ip->i_e2fs_gen == 0) {
if (++ext2gennumber < (u_long)time_second)
ext2gennumber = time_second;
ip->i_e2fs_gen = ext2gennumber;
if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0)
ip->i_flag |= IN_MODIFIED;
}
*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 ext2fs_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
*/
int
ext2fs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
{
struct inode *ip;
struct vnode *nvp;
int error;
struct ufid *ufhp;
struct m_ext2fs *fs;
ufhp = (struct ufid *)fhp;
fs = VFSTOUFS(mp)->um_e2fs;
if ((ufhp->ufid_ino < EXT2_FIRSTINO && ufhp->ufid_ino != EXT2_ROOTINO) ||
ufhp->ufid_ino > fs->e2fs_ncg * fs->e2fs.e2fs_ipg)
return (ESTALE);
if ((error = VFS_VGET(mp, ufhp->ufid_ino, &nvp)) != 0) {
*vpp = NULLVP;
return (error);
}
ip = VTOI(nvp);
if (ip->i_e2fs_mode == 0 || ip->i_e2fs_dtime != 0 ||
ip->i_e2fs_gen != ufhp->ufid_gen) {
vput(nvp);
*vpp = NULLVP;
return (ESTALE);
}
*vpp = nvp;
return (0);
}
/*
* Vnode pointer to File handle
*/
/* ARGSUSED */
int
ext2fs_vptofh(struct vnode *vp, struct fid *fhp)
{
struct inode *ip;
struct ufid *ufhp;
ip = VTOI(vp);
ufhp = (struct ufid *)fhp;
ufhp->ufid_len = sizeof(struct ufid);
ufhp->ufid_ino = ip->i_number;
ufhp->ufid_gen = ip->i_e2fs_gen;
return (0);
}
/*
* no sysctl for ext2fs
*/
int
ext2fs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
void *newp, size_t newlen, struct proc *p)
{
return (EOPNOTSUPP);
}
/*
* Write a superblock and associated information back to disk.
*/
int
ext2fs_sbupdate(struct ufsmount *mp, int waitfor)
{
struct m_ext2fs *fs = mp->um_e2fs;
struct buf *bp;
int error = 0;
bp = getblk(mp->um_devvp, SBLOCK, SBSIZE, 0, 0);
e2fs_sbsave(&fs->e2fs, (struct ext2fs *) bp->b_data);
if (waitfor == MNT_WAIT)
error = bwrite(bp);
else
bawrite(bp);
return (error);
}
int
ext2fs_cgupdate(struct ufsmount *mp, int waitfor)
{
struct m_ext2fs *fs = mp->um_e2fs;
struct buf *bp;
int i, error = 0, allerror = 0;
allerror = ext2fs_sbupdate(mp, waitfor);
for (i = 0; i < fs->e2fs_ngdb; i++) {
bp = getblk(mp->um_devvp, fsbtodb(fs, ((fs->e2fs_bsize>1024)?0:1)+i+1),
fs->e2fs_bsize, 0, 0);
e2fs_cgsave(&fs->e2fs_gd[i* fs->e2fs_bsize / sizeof(struct ext2_gd)], (struct ext2_gd*)bp->b_data, fs->e2fs_bsize);
if (waitfor == MNT_WAIT)
error = bwrite(bp);
else
bawrite(bp);
}
if (!allerror && error)
allerror = error;
return (allerror);
}
static int
ext2fs_checksb(struct ext2fs *fs, int ronly)
{
if (fs2h16(fs->e2fs_magic) != E2FS_MAGIC) {
return (EIO); /* XXX needs translation */
}
if (fs2h32(fs->e2fs_rev) > E2FS_REV1) {
#ifdef DIAGNOSTIC
printf("Ext2 fs: unsupported revision number: %x\n",
fs2h32(fs->e2fs_rev));
#endif
return (EIO); /* XXX needs translation */
}
if (fs2h32(fs->e2fs_log_bsize) > 2) { /* block size = 1024|2048|4096 */
#ifdef DIAGNOSTIC
printf("Ext2 fs: bad block size: %d (expected <=2 for ext2 fs)\n",
fs2h32(fs->e2fs_log_bsize));
#endif
return (EIO); /* XXX needs translation */
}
if (fs2h32(fs->e2fs_rev) > E2FS_REV0) {
if (fs2h32(fs->e2fs_first_ino) != EXT2_FIRSTINO ||
fs2h16(fs->e2fs_inode_size) != EXT2_DINODE_SIZE) {
printf("Ext2 fs: unsupported inode size\n");
return (EINVAL); /* XXX needs translation */
}
if (fs2h32(fs->e2fs_features_incompat) &
~EXT2F_INCOMPAT_SUPP) {
printf("Ext2 fs: unsupported optional feature\n");
return (EINVAL); /* XXX needs translation */
}
if (!ronly && fs2h32(fs->e2fs_features_rocompat) &
~EXT2F_ROCOMPAT_SUPP) {
return (EROFS); /* XXX needs translation */
}
}
return (0);
}
![[BACK]](/icons/back.gif){kind=icon}
Return to ext2fs_vfsops.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / ufs / ext2fs