freebsd-dev/sys/fs/tarfs/tarfs_io.c
Dag-Erling Smørgrav 91e03758de tarfs: Don't use IO_DIRECT when reading from tarball.
Sponsored by:	Juniper Networks, Inc.
Sponsored by:	Klara, Inc.
Reviewed by:	kib
Differential Revision:	https://reviews.freebsd.org/D40612
2023-06-20 10:02:10 +00:00

742 lines
19 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2013 Juniper Networks, Inc.
* Copyright (c) 2022-2023 Klara, Inc.
*
* 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 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 AUTHOR 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.
*/
#include "opt_tarfs.h"
#include "opt_zstdio.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/counter.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <sys/vnode.h>
#if defined(ZSTDIO)
#define TARFS_ZIO 1
#else
#undef TARFS_ZIO
#endif
#ifdef ZSTDIO
#define ZSTD_STATIC_LINKING_ONLY
#include <contrib/zstd/lib/zstd.h>
#endif
#include <fs/tarfs/tarfs.h>
#include <fs/tarfs/tarfs_dbg.h>
#ifdef TARFS_DEBUG
SYSCTL_NODE(_vfs_tarfs, OID_AUTO, zio, CTLFLAG_RD, 0,
"Tar filesystem decompression layer");
COUNTER_U64_DEFINE_EARLY(tarfs_zio_inflated);
SYSCTL_COUNTER_U64(_vfs_tarfs_zio, OID_AUTO, inflated, CTLFLAG_RD,
&tarfs_zio_inflated, "Amount of compressed data inflated.");
COUNTER_U64_DEFINE_EARLY(tarfs_zio_consumed);
SYSCTL_COUNTER_U64(_vfs_tarfs_zio, OID_AUTO, consumed, CTLFLAG_RD,
&tarfs_zio_consumed, "Amount of compressed data consumed.");
COUNTER_U64_DEFINE_EARLY(tarfs_zio_bounced);
SYSCTL_COUNTER_U64(_vfs_tarfs_zio, OID_AUTO, bounced, CTLFLAG_RD,
&tarfs_zio_bounced, "Amount of decompressed data bounced.");
static int
tarfs_sysctl_handle_zio_reset(SYSCTL_HANDLER_ARGS)
{
unsigned int tmp;
int error;
tmp = 0;
if ((error = SYSCTL_OUT(req, &tmp, sizeof(tmp))) != 0)
return (error);
if (req->newptr != NULL) {
if ((error = SYSCTL_IN(req, &tmp, sizeof(tmp))) != 0)
return (error);
counter_u64_zero(tarfs_zio_inflated);
counter_u64_zero(tarfs_zio_consumed);
counter_u64_zero(tarfs_zio_bounced);
}
return (0);
}
SYSCTL_PROC(_vfs_tarfs_zio, OID_AUTO, reset,
CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RW,
NULL, 0, tarfs_sysctl_handle_zio_reset, "IU",
"Reset compression counters.");
#endif
MALLOC_DEFINE(M_TARFSZSTATE, "tarfs zstate", "tarfs decompression state");
MALLOC_DEFINE(M_TARFSZBUF, "tarfs zbuf", "tarfs decompression buffers");
#define XZ_MAGIC (uint8_t[]){ 0xfd, 0x37, 0x7a, 0x58, 0x5a }
#define ZLIB_MAGIC (uint8_t[]){ 0x1f, 0x8b, 0x08 }
#define ZSTD_MAGIC (uint8_t[]){ 0x28, 0xb5, 0x2f, 0xfd }
#ifdef ZSTDIO
struct tarfs_zstd {
ZSTD_DStream *zds;
};
#endif
/* XXX review use of curthread / uio_td / td_cred */
/*
* Reads from the tar file according to the provided uio. If the archive
* is compressed and raw is false, reads the decompressed stream;
* otherwise, reads directly from the original file. Returns 0 on success
* and a positive errno value on failure.
*/
int
tarfs_io_read(struct tarfs_mount *tmp, bool raw, struct uio *uiop)
{
void *rl = NULL;
off_t off = uiop->uio_offset;
size_t len = uiop->uio_resid;
int error;
if (raw || tmp->znode == NULL) {
rl = vn_rangelock_rlock(tmp->vp, off, off + len);
error = vn_lock(tmp->vp, LK_SHARED);
if (error == 0) {
error = VOP_READ(tmp->vp, uiop, IO_NODELOCKED,
uiop->uio_td->td_ucred);
VOP_UNLOCK(tmp->vp);
}
vn_rangelock_unlock(tmp->vp, rl);
} else {
error = vn_lock(tmp->znode, LK_EXCLUSIVE);
if (error == 0) {
error = VOP_READ(tmp->znode, uiop,
IO_DIRECT | IO_NODELOCKED,
uiop->uio_td->td_ucred);
VOP_UNLOCK(tmp->znode);
}
}
TARFS_DPF(IO, "%s(%zu, %zu) = %d (resid %zd)\n", __func__,
(size_t)off, len, error, uiop->uio_resid);
return (error);
}
/*
* Reads from the tar file into the provided buffer. If the archive is
* compressed and raw is false, reads the decompressed stream; otherwise,
* reads directly from the original file. Returns the number of bytes
* read on success, 0 on EOF, and a negative errno value on failure.
*/
ssize_t
tarfs_io_read_buf(struct tarfs_mount *tmp, bool raw,
void *buf, off_t off, size_t len)
{
struct uio auio;
struct iovec aiov;
ssize_t res;
int error;
if (len == 0) {
TARFS_DPF(IO, "%s(%zu, %zu) null\n", __func__,
(size_t)off, len);
return (0);
}
aiov.iov_base = buf;
aiov.iov_len = len;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = off;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_READ;
auio.uio_resid = len;
auio.uio_td = curthread;
error = tarfs_io_read(tmp, raw, &auio);
if (error != 0) {
TARFS_DPF(IO, "%s(%zu, %zu) error %d\n", __func__,
(size_t)off, len, error);
return (-error);
}
res = len - auio.uio_resid;
if (res == 0 && len != 0) {
TARFS_DPF(IO, "%s(%zu, %zu) eof\n", __func__,
(size_t)off, len);
} else {
TARFS_DPF(IO, "%s(%zu, %zu) read %zd | %*D\n", __func__,
(size_t)off, len, res,
(int)(res > 8 ? 8 : res), (uint8_t *)buf, " ");
}
return (res);
}
#ifdef ZSTDIO
static void *
tarfs_zstate_alloc(void *opaque, size_t size)
{
(void)opaque;
return (malloc(size, M_TARFSZSTATE, M_WAITOK));
}
#endif
#ifdef ZSTDIO
static void
tarfs_zstate_free(void *opaque, void *address)
{
(void)opaque;
free(address, M_TARFSZSTATE);
}
#endif
#ifdef ZSTDIO
static ZSTD_customMem tarfs_zstd_mem = {
tarfs_zstate_alloc,
tarfs_zstate_free,
NULL,
};
#endif
#ifdef TARFS_ZIO
/*
* Updates the decompression frame index, recording the current input and
* output offsets in a new index entry, and growing the index if
* necessary.
*/
static void
tarfs_zio_update_index(struct tarfs_zio *zio, off_t i, off_t o)
{
if (++zio->curidx >= zio->nidx) {
if (++zio->nidx > zio->szidx) {
zio->szidx *= 2;
zio->idx = realloc(zio->idx,
zio->szidx * sizeof(*zio->idx),
M_TARFSZSTATE, M_ZERO | M_WAITOK);
TARFS_DPF(ALLOC, "%s: resized zio index\n", __func__);
}
zio->idx[zio->curidx].i = i;
zio->idx[zio->curidx].o = o;
TARFS_DPF(ZIDX, "%s: index %u = i %zu o %zu\n", __func__,
zio->curidx, (size_t)zio->idx[zio->curidx].i,
(size_t)zio->idx[zio->curidx].o);
}
MPASS(zio->idx[zio->curidx].i == i);
MPASS(zio->idx[zio->curidx].o == o);
}
#endif
/*
* VOP_ACCESS for zio node.
*/
static int
tarfs_zaccess(struct vop_access_args *ap)
{
struct vnode *vp = ap->a_vp;
struct tarfs_zio *zio = vp->v_data;
struct tarfs_mount *tmp = zio->tmp;
accmode_t accmode = ap->a_accmode;
int error = EPERM;
if (accmode == VREAD) {
error = vn_lock(tmp->vp, LK_SHARED);
if (error == 0) {
error = VOP_ACCESS(tmp->vp, accmode, ap->a_cred, ap->a_td);
VOP_UNLOCK(tmp->vp);
}
}
TARFS_DPF(ZIO, "%s(%d) = %d\n", __func__, accmode, error);
return (error);
}
/*
* VOP_GETATTR for zio node.
*/
static int
tarfs_zgetattr(struct vop_getattr_args *ap)
{
struct vattr va;
struct vnode *vp = ap->a_vp;
struct tarfs_zio *zio = vp->v_data;
struct tarfs_mount *tmp = zio->tmp;
struct vattr *vap = ap->a_vap;
int error = 0;
VATTR_NULL(vap);
error = vn_lock(tmp->vp, LK_SHARED);
if (error == 0) {
error = VOP_GETATTR(tmp->vp, &va, ap->a_cred);
VOP_UNLOCK(tmp->vp);
if (error == 0) {
vap->va_type = VREG;
vap->va_mode = va.va_mode;
vap->va_nlink = 1;
vap->va_gid = va.va_gid;
vap->va_uid = va.va_uid;
vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
vap->va_fileid = TARFS_ZIOINO;
vap->va_size = zio->idx[zio->nidx - 1].o;
vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
vap->va_atime = va.va_atime;
vap->va_ctime = va.va_ctime;
vap->va_mtime = va.va_mtime;
vap->va_birthtime = tmp->root->birthtime;
vap->va_bytes = va.va_bytes;
}
}
TARFS_DPF(ZIO, "%s() = %d\n", __func__, error);
return (error);
}
#ifdef ZSTDIO
/*
* VOP_READ for zio node, zstd edition.
*/
static int
tarfs_zread_zstd(struct tarfs_zio *zio, struct uio *uiop)
{
void *ibuf = NULL, *obuf = NULL, *rl = NULL;
struct uio auio;
struct iovec aiov;
struct tarfs_mount *tmp = zio->tmp;
struct tarfs_zstd *zstd = zio->zstd;
struct thread *td = curthread;
ZSTD_inBuffer zib;
ZSTD_outBuffer zob;
off_t zsize;
off_t ipos, opos;
size_t ilen, olen;
size_t zerror;
off_t off = uiop->uio_offset;
size_t len = uiop->uio_resid;
size_t resid = uiop->uio_resid;
size_t bsize;
int error;
bool reset = false;
/* do we have to rewind? */
if (off < zio->opos) {
while (zio->curidx > 0 && off < zio->idx[zio->curidx].o)
zio->curidx--;
reset = true;
}
/* advance to the nearest index entry */
if (off > zio->opos) {
// XXX maybe do a binary search instead
while (zio->curidx < zio->nidx - 1 &&
off >= zio->idx[zio->curidx + 1].o) {
zio->curidx++;
reset = true;
}
}
/* reset the decompression stream if needed */
if (reset) {
zio->ipos = zio->idx[zio->curidx].i;
zio->opos = zio->idx[zio->curidx].o;
ZSTD_resetDStream(zstd->zds);
TARFS_DPF(ZIDX, "%s: skipping to index %u = i %zu o %zu\n", __func__,
zio->curidx, (size_t)zio->ipos, (size_t)zio->opos);
} else {
TARFS_DPF(ZIDX, "%s: continuing at i %zu o %zu\n", __func__,
(size_t)zio->ipos, (size_t)zio->opos);
}
/*
* Set up a temporary buffer for compressed data. Use the size
* recommended by the zstd library; this is usually 128 kB, but
* just in case, make sure it's a multiple of the page size and no
* larger than MAXBSIZE.
*/
bsize = roundup(ZSTD_CStreamOutSize(), PAGE_SIZE);
if (bsize > MAXBSIZE)
bsize = MAXBSIZE;
ibuf = malloc(bsize, M_TEMP, M_WAITOK);
zib.src = NULL;
zib.size = 0;
zib.pos = 0;
/*
* Set up the decompression buffer. If the target is not in
* kernel space, we will have to set up a bounce buffer.
*
* TODO: to avoid using a bounce buffer, map destination pages
* using vm_fault_quick_hold_pages().
*/
MPASS(zio->opos <= off);
MPASS(uiop->uio_iovcnt == 1);
MPASS(uiop->uio_iov->iov_len >= len);
if (uiop->uio_segflg == UIO_SYSSPACE) {
zob.dst = uiop->uio_iov->iov_base;
} else {
TARFS_DPF(BOUNCE, "%s: allocating %zu-byte bounce buffer\n",
__func__, len);
zob.dst = obuf = malloc(len, M_TEMP, M_WAITOK);
}
zob.size = len;
zob.pos = 0;
/* lock tarball */
rl = vn_rangelock_rlock(tmp->vp, zio->ipos, OFF_MAX);
error = vn_lock(tmp->vp, LK_SHARED);
if (error != 0) {
goto fail_unlocked;
}
/* check size */
error = vn_getsize_locked(tmp->vp, &zsize, td->td_ucred);
if (error != 0) {
goto fail;
}
if (zio->ipos >= zsize) {
/* beyond EOF */
goto fail;
}
while (resid > 0) {
if (zib.pos == zib.size) {
/* request data from the underlying file */
aiov.iov_base = ibuf;
aiov.iov_len = bsize;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = zio->ipos;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_READ;
auio.uio_resid = aiov.iov_len;
auio.uio_td = td;
error = VOP_READ(tmp->vp, &auio, IO_NODELOCKED,
td->td_ucred);
if (error != 0)
goto fail;
TARFS_DPF(ZIO, "%s: req %zu+%zu got %zu+%zu\n", __func__,
(size_t)zio->ipos, bsize,
(size_t)zio->ipos, bsize - auio.uio_resid);
zib.src = ibuf;
zib.size = bsize - auio.uio_resid;
zib.pos = 0;
}
MPASS(zib.pos <= zib.size);
if (zib.pos == zib.size) {
TARFS_DPF(ZIO, "%s: end of file after i %zu o %zu\n", __func__,
(size_t)zio->ipos, (size_t)zio->opos);
goto fail;
}
if (zio->opos < off) {
/* to be discarded */
zob.size = min(off - zio->opos, len);
zob.pos = 0;
} else {
zob.size = len;
zob.pos = zio->opos - off;
}
ipos = zib.pos;
opos = zob.pos;
/* decompress as much as possible */
zerror = ZSTD_decompressStream(zstd->zds, &zob, &zib);
zio->ipos += ilen = zib.pos - ipos;
zio->opos += olen = zob.pos - opos;
if (zio->opos > off)
resid -= olen;
if (ZSTD_isError(zerror)) {
TARFS_DPF(ZIO, "%s: inflate failed after i %zu o %zu: %s\n", __func__,
(size_t)zio->ipos, (size_t)zio->opos, ZSTD_getErrorName(zerror));
error = EIO;
goto fail;
}
if (zerror == 0 && olen == 0) {
TARFS_DPF(ZIO, "%s: end of stream after i %zu o %zu\n", __func__,
(size_t)zio->ipos, (size_t)zio->opos);
break;
}
if (zerror == 0) {
TARFS_DPF(ZIO, "%s: end of frame after i %zu o %zu\n", __func__,
(size_t)zio->ipos, (size_t)zio->opos);
tarfs_zio_update_index(zio, zio->ipos, zio->opos);
}
TARFS_DPF(ZIO, "%s: inflated %zu\n", __func__, olen);
#ifdef TARFS_DEBUG
counter_u64_add(tarfs_zio_inflated, olen);
#endif
}
fail:
VOP_UNLOCK(tmp->vp);
fail_unlocked:
if (error == 0) {
if (uiop->uio_segflg == UIO_SYSSPACE) {
uiop->uio_resid = resid;
} else if (len > resid) {
TARFS_DPF(BOUNCE, "%s: bounced %zu bytes\n", __func__,
len - resid);
error = uiomove(obuf, len - resid, uiop);
#ifdef TARFS_DEBUG
counter_u64_add(tarfs_zio_bounced, len - resid);
#endif
}
}
if (obuf != NULL) {
TARFS_DPF(BOUNCE, "%s: freeing bounce buffer\n", __func__);
free(obuf, M_TEMP);
}
if (rl != NULL)
vn_rangelock_unlock(tmp->vp, rl);
if (ibuf != NULL)
free(ibuf, M_TEMP);
TARFS_DPF(ZIO, "%s(%zu, %zu) = %d (resid %zd)\n", __func__,
(size_t)off, len, error, uiop->uio_resid);
#ifdef TARFS_DEBUG
counter_u64_add(tarfs_zio_consumed, len - uiop->uio_resid);
#endif
if (error != 0) {
zio->curidx = 0;
zio->ipos = zio->idx[0].i;
zio->opos = zio->idx[0].o;
ZSTD_resetDStream(zstd->zds);
}
return (error);
}
#endif
/*
* VOP_READ for zio node.
*/
static int
tarfs_zread(struct vop_read_args *ap)
{
#if defined(TARFS_DEBUG) || defined(ZSTDIO)
struct vnode *vp = ap->a_vp;
struct tarfs_zio *zio = vp->v_data;
struct uio *uiop = ap->a_uio;
#endif
#ifdef TARFS_DEBUG
off_t off = uiop->uio_offset;
size_t len = uiop->uio_resid;
#endif
int error;
TARFS_DPF(ZIO, "%s(%zu, %zu)\n", __func__,
(size_t)off, len);
#ifdef ZSTDIO
if (zio->zstd != NULL) {
error = tarfs_zread_zstd(zio, uiop);
} else
#endif
error = EFTYPE;
TARFS_DPF(ZIO, "%s(%zu, %zu) = %d (resid %zd)\n", __func__,
(size_t)off, len, error, uiop->uio_resid);
return (error);
}
/*
* VOP_RECLAIM for zio node.
*/
static int
tarfs_zreclaim(struct vop_reclaim_args *ap)
{
struct vnode *vp = ap->a_vp;
TARFS_DPF(ZIO, "%s(%p)\n", __func__, vp);
vp->v_data = NULL;
return (0);
}
/*
* VOP_STRATEGY for zio node.
*/
static int
tarfs_zstrategy(struct vop_strategy_args *ap)
{
struct uio auio;
struct iovec iov;
struct vnode *vp = ap->a_vp;
struct buf *bp = ap->a_bp;
off_t off;
size_t len;
int error;
iov.iov_base = bp->b_data;
iov.iov_len = bp->b_bcount;
off = bp->b_iooffset;
len = bp->b_bcount;
bp->b_resid = len;
auio.uio_iov = &iov;
auio.uio_iovcnt = 1;
auio.uio_offset = off;
auio.uio_resid = len;
auio.uio_segflg = UIO_SYSSPACE;
auio.uio_rw = UIO_READ;
auio.uio_td = curthread;
error = VOP_READ(vp, &auio, IO_DIRECT | IO_NODELOCKED, bp->b_rcred);
bp->b_flags |= B_DONE;
if (error != 0) {
bp->b_ioflags |= BIO_ERROR;
bp->b_error = error;
}
return (0);
}
static struct vop_vector tarfs_znodeops = {
.vop_default = &default_vnodeops,
.vop_access = tarfs_zaccess,
.vop_getattr = tarfs_zgetattr,
.vop_read = tarfs_zread,
.vop_reclaim = tarfs_zreclaim,
.vop_strategy = tarfs_zstrategy,
};
VFS_VOP_VECTOR_REGISTER(tarfs_znodeops);
#ifdef TARFS_ZIO
/*
* Initializes the decompression layer.
*/
static struct tarfs_zio *
tarfs_zio_init(struct tarfs_mount *tmp, off_t i, off_t o)
{
struct tarfs_zio *zio;
struct vnode *zvp;
zio = malloc(sizeof(*zio), M_TARFSZSTATE, M_ZERO | M_WAITOK);
TARFS_DPF(ALLOC, "%s: allocated zio\n", __func__);
zio->tmp = tmp;
zio->szidx = 128;
zio->idx = malloc(zio->szidx * sizeof(*zio->idx), M_TARFSZSTATE,
M_ZERO | M_WAITOK);
zio->curidx = 0;
zio->nidx = 1;
zio->idx[zio->curidx].i = zio->ipos = i;
zio->idx[zio->curidx].o = zio->opos = o;
tmp->zio = zio;
TARFS_DPF(ALLOC, "%s: allocated zio index\n", __func__);
(void)getnewvnode("tarfsz", tmp->vfs, &tarfs_znodeops, &zvp);
zvp->v_data = zio;
zvp->v_type = VREG;
zvp->v_mount = tmp->vfs;
vn_set_state(zvp, VSTATE_CONSTRUCTED);
tmp->znode = zvp;
TARFS_DPF(ZIO, "%s: created zio node\n", __func__);
return (zio);
}
#endif
/*
* Initializes the I/O layer, including decompression if the signature of
* a supported compression format is detected. Returns 0 on success and a
* positive errno value on failure.
*/
int
tarfs_io_init(struct tarfs_mount *tmp)
{
uint8_t *block;
#ifdef TARFS_ZIO
struct tarfs_zio *zio = NULL;
#endif
ssize_t res;
int error = 0;
block = malloc(tmp->iosize, M_TEMP, M_ZERO | M_WAITOK);
res = tarfs_io_read_buf(tmp, true, block, 0, tmp->iosize);
if (res < 0) {
return (-res);
}
if (memcmp(block, XZ_MAGIC, sizeof(XZ_MAGIC)) == 0) {
printf("xz compression not supported\n");
error = EOPNOTSUPP;
goto bad;
} else if (memcmp(block, ZLIB_MAGIC, sizeof(ZLIB_MAGIC)) == 0) {
printf("zlib compression not supported\n");
error = EOPNOTSUPP;
goto bad;
} else if (memcmp(block, ZSTD_MAGIC, sizeof(ZSTD_MAGIC)) == 0) {
#ifdef ZSTDIO
zio = tarfs_zio_init(tmp, 0, 0);
zio->zstd = malloc(sizeof(*zio->zstd), M_TARFSZSTATE, M_WAITOK);
zio->zstd->zds = ZSTD_createDStream_advanced(tarfs_zstd_mem);
(void)ZSTD_initDStream(zio->zstd->zds);
#else
printf("zstd compression not supported\n");
error = EOPNOTSUPP;
goto bad;
#endif
}
bad:
free(block, M_TEMP);
return (error);
}
#ifdef TARFS_ZIO
/*
* Tears down the decompression layer.
*/
static int
tarfs_zio_fini(struct tarfs_mount *tmp)
{
struct tarfs_zio *zio = tmp->zio;
int error = 0;
if (tmp->znode != NULL) {
error = vn_lock(tmp->znode, LK_EXCLUSIVE);
if (error != 0) {
TARFS_DPF(ALLOC, "%s: failed to lock znode", __func__);
return (error);
}
tmp->znode->v_mount = NULL;
vgone(tmp->znode);
vput(tmp->znode);
tmp->znode = NULL;
}
#ifdef ZSTDIO
if (zio->zstd != NULL) {
TARFS_DPF(ALLOC, "%s: freeing zstd state\n", __func__);
ZSTD_freeDStream(zio->zstd->zds);
free(zio->zstd, M_TARFSZSTATE);
}
#endif
if (zio->idx != NULL) {
TARFS_DPF(ALLOC, "%s: freeing index\n", __func__);
free(zio->idx, M_TARFSZSTATE);
}
TARFS_DPF(ALLOC, "%s: freeing zio\n", __func__);
free(zio, M_TARFSZSTATE);
tmp->zio = NULL;
return (error);
}
#endif
/*
* Tears down the I/O layer, including the decompression layer if
* applicable.
*/
int
tarfs_io_fini(struct tarfs_mount *tmp)
{
int error = 0;
#ifdef TARFS_ZIO
if (tmp->zio != NULL) {
error = tarfs_zio_fini(tmp);
}
#endif
return (error);
}