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Block layer patches:

Browse source 
- qcow2: Use worker threads for compression to improve performance of
   'qemu-img convert -W' and compressed backup jobs
 - blklogwrites: New filter driver to log write requests to an image in
   the dm-log-writes format
 - file-posix: Fix image locking during image creation
 - crypto: Fix memory leak in error path
 - Error out instead of silently truncating node names
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Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block layer patches:

- qcow2: Use worker threads for compression to improve performance of
  'qemu-img convert -W' and compressed backup jobs
- blklogwrites: New filter driver to log write requests to an image in
  the dm-log-writes format
- file-posix: Fix image locking during image creation
- crypto: Fix memory leak in error path
- Error out instead of silently truncating node names

# gpg: Signature made Thu 05 Jul 2018 11:24:33 BST
# gpg:                using RSA key 7F09B272C88F2FD6
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>"
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* remotes/kevin/tags/for-upstream:
  file-posix: Unlock FD after creation
  file-posix: Fix creation locking
  block/blklogwrites: Add an option for the update interval of the log superblock
  block/blklogwrites: Add an option for appending to an old log
  block/blklogwrites: Change log_sector_size from int64_t to uint64_t
  block/crypto: Fix memory leak in create error path
  block: Don't silently truncate node names
  block: Add blklogwrites
  block: Move two block permission constants to the relevant enum
  qcow2: add compress threads
  qcow2: refactor data compression
  qemu-img: allow compressed not-in-order writes

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2018-07-05 15:53:04 +01:00
parent 6cf495be0b 7c20c808a5
commit 1daf14ec9e
14 changed files with 791 additions and 50 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
MAINTAINERS
View file

@ -2052,6 +2052,12 @@ S: Supported
F: block/quorum.c
L: qemu-block@nongnu.org
blklogwrites
M: Ari Sundholm <ari@tuxera.com>
L: qemu-block@nongnu.org
S: Supported
F: block/blklogwrites.c
blkverify
M: Stefan Hajnoczi <stefanha@redhat.com>
L: qemu-block@nongnu.org

12
block.c
View file

@ -1156,6 +1156,12 @@ static void bdrv_assign_node_name(BlockDriverState *bs,
goto out;
}
/* Make sure that the node name isn't truncated */
if (strlen(node_name) >= sizeof(bs->node_name)) {
error_setg(errp, "Node name too long");
goto out;
}
/* copy node name into the bs and insert it into the graph list */
pstrcpy(bs->node_name, sizeof(bs->node_name), node_name);
QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list);
@ -1948,12 +1954,6 @@ int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared,
return 0;
}
#define DEFAULT_PERM_PASSTHROUGH (BLK_PERM_CONSISTENT_READ \
| BLK_PERM_WRITE \
| BLK_PERM_WRITE_UNCHANGED \
| BLK_PERM_RESIZE)
#define DEFAULT_PERM_UNCHANGED (BLK_PERM_ALL & ~DEFAULT_PERM_PASSTHROUGH)
void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
BlockReopenQueue *reopen_queue,

1
block/Makefile.objs
View file

@ -5,6 +5,7 @@ block-obj-y += qed-check.o
block-obj-y += vhdx.o vhdx-endian.o vhdx-log.o
block-obj-y += quorum.o
block-obj-y += parallels.o blkdebug.o blkverify.o blkreplay.o
block-obj-y += blklogwrites.o
block-obj-y += block-backend.o snapshot.o qapi.o
block-obj-$(CONFIG_WIN32) += file-win32.o win32-aio.o
block-obj-$(CONFIG_POSIX) += file-posix.o

547
block/blklogwrites.c Normal file
View file

@ -0,0 +1,547 @@
/*
* Write logging blk driver based on blkverify and blkdebug.
*
* Copyright (c) 2017 Tuomas Tynkkynen <tuomas@tuxera.com>
* Copyright (c) 2018 Aapo Vienamo <aapo@tuxera.com>
* Copyright (c) 2018 Ari Sundholm <ari@tuxera.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/sockets.h" /* for EINPROGRESS on Windows */
#include "block/block_int.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qstring.h"
#include "qemu/cutils.h"
#include "qemu/option.h"
/* Disk format stuff - taken from Linux drivers/md/dm-log-writes.c */
#define LOG_FLUSH_FLAG (1 << 0)
#define LOG_FUA_FLAG (1 << 1)
#define LOG_DISCARD_FLAG (1 << 2)
#define LOG_MARK_FLAG (1 << 3)
#define LOG_FLAG_MASK (LOG_FLUSH_FLAG \
| LOG_FUA_FLAG \
| LOG_DISCARD_FLAG \
| LOG_MARK_FLAG)
#define WRITE_LOG_VERSION 1ULL
#define WRITE_LOG_MAGIC 0x6a736677736872ULL
/* All fields are little-endian. */
struct log_write_super {
uint64_t magic;
uint64_t version;
uint64_t nr_entries;
uint32_t sectorsize;
} QEMU_PACKED;
struct log_write_entry {
uint64_t sector;
uint64_t nr_sectors;
uint64_t flags;
uint64_t data_len;
} QEMU_PACKED;
/* End of disk format structures. */
typedef struct {
BdrvChild *log_file;
uint32_t sectorsize;
uint32_t sectorbits;
uint64_t cur_log_sector;
uint64_t nr_entries;
uint64_t update_interval;
} BDRVBlkLogWritesState;
static QemuOptsList runtime_opts = {
.name = "blklogwrites",
.head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
.desc = {
{
.name = "log-append",
.type = QEMU_OPT_BOOL,
.help = "Append to an existing log",
},
{
.name = "log-sector-size",
.type = QEMU_OPT_SIZE,
.help = "Log sector size",
},
{
.name = "log-super-update-interval",
.type = QEMU_OPT_NUMBER,
.help = "Log superblock update interval (# of write requests)",
},
{ /* end of list */ }
},
};
static inline uint32_t blk_log_writes_log2(uint32_t value)
{
assert(value > 0);
return 31 - clz32(value);
}
static inline bool blk_log_writes_sector_size_valid(uint32_t sector_size)
{
return sector_size < (1ull << 24) && is_power_of_2(sector_size);
}
static uint64_t blk_log_writes_find_cur_log_sector(BdrvChild *log,
uint32_t sector_size,
uint64_t nr_entries,
Error **errp)
{
uint64_t cur_sector = 1;
uint64_t cur_idx = 0;
uint32_t sector_bits = blk_log_writes_log2(sector_size);
struct log_write_entry cur_entry;
while (cur_idx < nr_entries) {
int read_ret = bdrv_pread(log, cur_sector << sector_bits, &cur_entry,
sizeof(cur_entry));
if (read_ret < 0) {
error_setg_errno(errp, -read_ret,
"Failed to read log entry %"PRIu64, cur_idx);
return (uint64_t)-1ull;
}
if (cur_entry.flags & ~cpu_to_le64(LOG_FLAG_MASK)) {
error_setg(errp, "Invalid flags 0x%"PRIx64" in log entry %"PRIu64,
le64_to_cpu(cur_entry.flags), cur_idx);
return (uint64_t)-1ull;
}
/* Account for the sector of the entry itself */
++cur_sector;
/*
* Account for the data of the write.
* For discards, this data is not present.
*/
if (!(cur_entry.flags & cpu_to_le64(LOG_DISCARD_FLAG))) {
cur_sector += le64_to_cpu(cur_entry.nr_sectors);
}
++cur_idx;
}
return cur_sector;
}
static int blk_log_writes_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
BDRVBlkLogWritesState *s = bs->opaque;
QemuOpts *opts;
Error *local_err = NULL;
int ret;
uint64_t log_sector_size;
bool log_append;
opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
qemu_opts_absorb_qdict(opts, options, &local_err);
if (local_err) {
ret = -EINVAL;
error_propagate(errp, local_err);
goto fail;
}
/* Open the file */
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, false,
&local_err);
if (local_err) {
ret = -EINVAL;
error_propagate(errp, local_err);
goto fail;
}
/* Open the log file */
s->log_file = bdrv_open_child(NULL, options, "log", bs, &child_file, false,
&local_err);
if (local_err) {
ret = -EINVAL;
error_propagate(errp, local_err);
goto fail;
}
log_append = qemu_opt_get_bool(opts, "log-append", false);
if (log_append) {
struct log_write_super log_sb = { 0, 0, 0, 0 };
if (qemu_opt_find(opts, "log-sector-size")) {
ret = -EINVAL;
error_setg(errp, "log-append and log-sector-size are mutually "
"exclusive");
goto fail_log;
}
/* Read log superblock or fake one for an empty log */
if (!bdrv_getlength(s->log_file->bs)) {
log_sb.magic = cpu_to_le64(WRITE_LOG_MAGIC);
log_sb.version = cpu_to_le64(WRITE_LOG_VERSION);
log_sb.nr_entries = cpu_to_le64(0);
log_sb.sectorsize = cpu_to_le32(BDRV_SECTOR_SIZE);
} else {
ret = bdrv_pread(s->log_file, 0, &log_sb, sizeof(log_sb));
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not read log superblock");
goto fail_log;
}
}
if (log_sb.magic != cpu_to_le64(WRITE_LOG_MAGIC)) {
ret = -EINVAL;
error_setg(errp, "Invalid log superblock magic");
goto fail_log;
}
if (log_sb.version != cpu_to_le64(WRITE_LOG_VERSION)) {
ret = -EINVAL;
error_setg(errp, "Unsupported log version %"PRIu64,
le64_to_cpu(log_sb.version));
goto fail_log;
}
log_sector_size = le32_to_cpu(log_sb.sectorsize);
s->cur_log_sector = 1;
s->nr_entries = 0;
if (blk_log_writes_sector_size_valid(log_sector_size)) {
s->cur_log_sector =
blk_log_writes_find_cur_log_sector(s->log_file, log_sector_size,
le64_to_cpu(log_sb.nr_entries), &local_err);
if (local_err) {
ret = -EINVAL;
error_propagate(errp, local_err);
goto fail_log;
}
s->nr_entries = le64_to_cpu(log_sb.nr_entries);
}
} else {
log_sector_size = qemu_opt_get_size(opts, "log-sector-size",
BDRV_SECTOR_SIZE);
s->cur_log_sector = 1;
s->nr_entries = 0;
}
if (!blk_log_writes_sector_size_valid(log_sector_size)) {
ret = -EINVAL;
error_setg(errp, "Invalid log sector size %"PRIu64, log_sector_size);
goto fail_log;
}
s->sectorsize = log_sector_size;
s->sectorbits = blk_log_writes_log2(log_sector_size);
s->update_interval = qemu_opt_get_number(opts, "log-super-update-interval",
4096);
if (!s->update_interval) {
ret = -EINVAL;
error_setg(errp, "Invalid log superblock update interval %"PRIu64,
s->update_interval);
goto fail_log;
}
ret = 0;
fail_log:
if (ret < 0) {
bdrv_unref_child(bs, s->log_file);
s->log_file = NULL;
}
fail:
if (ret < 0) {
bdrv_unref_child(bs, bs->file);
bs->file = NULL;
}
qemu_opts_del(opts);
return ret;
}
static void blk_log_writes_close(BlockDriverState *bs)
{
BDRVBlkLogWritesState *s = bs->opaque;
bdrv_unref_child(bs, s->log_file);
s->log_file = NULL;
}
static int64_t blk_log_writes_getlength(BlockDriverState *bs)
{
return bdrv_getlength(bs->file->bs);
}
static void blk_log_writes_refresh_filename(BlockDriverState *bs,
QDict *options)
{
BDRVBlkLogWritesState *s = bs->opaque;
/* bs->file->bs has already been refreshed */
bdrv_refresh_filename(s->log_file->bs);
if (bs->file->bs->full_open_options
&& s->log_file->bs->full_open_options)
{
QDict *opts = qdict_new();
qdict_put_str(opts, "driver", "blklogwrites");
qobject_ref(bs->file->bs->full_open_options);
qdict_put_obj(opts, "file", QOBJECT(bs->file->bs->full_open_options));
qobject_ref(s->log_file->bs->full_open_options);
qdict_put_obj(opts, "log",
QOBJECT(s->log_file->bs->full_open_options));
qdict_put_int(opts, "log-sector-size", s->sectorsize);
bs->full_open_options = opts;
}
}
static void blk_log_writes_child_perm(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
BlockReopenQueue *ro_q,
uint64_t perm, uint64_t shrd,
uint64_t *nperm, uint64_t *nshrd)
{
if (!c) {
*nperm = perm & DEFAULT_PERM_PASSTHROUGH;
*nshrd = (shrd & DEFAULT_PERM_PASSTHROUGH) | DEFAULT_PERM_UNCHANGED;
return;
}
if (!strcmp(c->name, "log")) {
bdrv_format_default_perms(bs, c, role, ro_q, perm, shrd, nperm, nshrd);
} else {
bdrv_filter_default_perms(bs, c, role, ro_q, perm, shrd, nperm, nshrd);
}
}
static void blk_log_writes_refresh_limits(BlockDriverState *bs, Error **errp)
{
BDRVBlkLogWritesState *s = bs->opaque;
bs->bl.request_alignment = s->sectorsize;
}
static int coroutine_fn
blk_log_writes_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags)
{
return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags);
}
typedef struct BlkLogWritesFileReq {
BlockDriverState *bs;
uint64_t offset;
uint64_t bytes;
int file_flags;
QEMUIOVector *qiov;
int (*func)(struct BlkLogWritesFileReq *r);
int file_ret;
} BlkLogWritesFileReq;
typedef struct {
BlockDriverState *bs;
QEMUIOVector *qiov;
struct log_write_entry entry;
uint64_t zero_size;
int log_ret;
} BlkLogWritesLogReq;
static void coroutine_fn blk_log_writes_co_do_log(BlkLogWritesLogReq *lr)
{
BDRVBlkLogWritesState *s = lr->bs->opaque;
uint64_t cur_log_offset = s->cur_log_sector << s->sectorbits;
s->nr_entries++;
s->cur_log_sector +=
ROUND_UP(lr->qiov->size, s->sectorsize) >> s->sectorbits;
lr->log_ret = bdrv_co_pwritev(s->log_file, cur_log_offset, lr->qiov->size,
lr->qiov, 0);
/* Logging for the "write zeroes" operation */
if (lr->log_ret == 0 && lr->zero_size) {
cur_log_offset = s->cur_log_sector << s->sectorbits;
s->cur_log_sector +=
ROUND_UP(lr->zero_size, s->sectorsize) >> s->sectorbits;
lr->log_ret = bdrv_co_pwrite_zeroes(s->log_file, cur_log_offset,
lr->zero_size, 0);
}
/* Update super block on flush or every update interval */
if (lr->log_ret == 0 && ((lr->entry.flags & LOG_FLUSH_FLAG)
|| (s->nr_entries % s->update_interval == 0)))
{
struct log_write_super super = {
.magic = cpu_to_le64(WRITE_LOG_MAGIC),
.version = cpu_to_le64(WRITE_LOG_VERSION),
.nr_entries = cpu_to_le64(s->nr_entries),
.sectorsize = cpu_to_le32(s->sectorsize),
};
void *zeroes = g_malloc0(s->sectorsize - sizeof(super));
QEMUIOVector qiov;
qemu_iovec_init(&qiov, 2);
qemu_iovec_add(&qiov, &super, sizeof(super));
qemu_iovec_add(&qiov, zeroes, s->sectorsize - sizeof(super));
lr->log_ret =
bdrv_co_pwritev(s->log_file, 0, s->sectorsize, &qiov, 0);
if (lr->log_ret == 0) {
lr->log_ret = bdrv_co_flush(s->log_file->bs);
}
qemu_iovec_destroy(&qiov);
g_free(zeroes);
}
}
static void coroutine_fn blk_log_writes_co_do_file(BlkLogWritesFileReq *fr)
{
fr->file_ret = fr->func(fr);
}
static int coroutine_fn
blk_log_writes_co_log(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags,
int (*file_func)(BlkLogWritesFileReq *r),
uint64_t entry_flags, bool is_zero_write)
{
QEMUIOVector log_qiov;
size_t niov = qiov ? qiov->niov : 0;
BDRVBlkLogWritesState *s = bs->opaque;
BlkLogWritesFileReq fr = {
.bs = bs,
.offset = offset,
.bytes = bytes,
.file_flags = flags,
.qiov = qiov,
.func = file_func,
};
BlkLogWritesLogReq lr = {
.bs = bs,
.qiov = &log_qiov,
.entry = {
.sector = cpu_to_le64(offset >> s->sectorbits),
.nr_sectors = cpu_to_le64(bytes >> s->sectorbits),
.flags = cpu_to_le64(entry_flags),
.data_len = 0,
},
.zero_size = is_zero_write ? bytes : 0,
};
void *zeroes = g_malloc0(s->sectorsize - sizeof(lr.entry));
assert((1 << s->sectorbits) == s->sectorsize);
assert(bs->bl.request_alignment == s->sectorsize);
assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment));
assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment));
qemu_iovec_init(&log_qiov, niov + 2);
qemu_iovec_add(&log_qiov, &lr.entry, sizeof(lr.entry));
qemu_iovec_add(&log_qiov, zeroes, s->sectorsize - sizeof(lr.entry));
if (qiov) {
qemu_iovec_concat(&log_qiov, qiov, 0, qiov->size);
}
blk_log_writes_co_do_file(&fr);
blk_log_writes_co_do_log(&lr);
qemu_iovec_destroy(&log_qiov);
g_free(zeroes);
if (lr.log_ret < 0) {
return lr.log_ret;
}
return fr.file_ret;
}
static int coroutine_fn
blk_log_writes_co_do_file_pwritev(BlkLogWritesFileReq *fr)
{
return bdrv_co_pwritev(fr->bs->file, fr->offset, fr->bytes,
fr->qiov, fr->file_flags);
}
static int coroutine_fn
blk_log_writes_co_do_file_pwrite_zeroes(BlkLogWritesFileReq *fr)
{
return bdrv_co_pwrite_zeroes(fr->bs->file, fr->offset, fr->bytes,
fr->file_flags);
}
static int coroutine_fn blk_log_writes_co_do_file_flush(BlkLogWritesFileReq *fr)
{
return bdrv_co_flush(fr->bs->file->bs);
}
static int coroutine_fn
blk_log_writes_co_do_file_pdiscard(BlkLogWritesFileReq *fr)
{
return bdrv_co_pdiscard(fr->bs->file->bs, fr->offset, fr->bytes);
}
static int coroutine_fn
blk_log_writes_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags)
{
return blk_log_writes_co_log(bs, offset, bytes, qiov, flags,
blk_log_writes_co_do_file_pwritev, 0, false);
}
static int coroutine_fn
blk_log_writes_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int bytes,
BdrvRequestFlags flags)
{
return blk_log_writes_co_log(bs, offset, bytes, NULL, flags,
blk_log_writes_co_do_file_pwrite_zeroes, 0,
true);
}
static int coroutine_fn blk_log_writes_co_flush_to_disk(BlockDriverState *bs)
{
return blk_log_writes_co_log(bs, 0, 0, NULL, 0,
blk_log_writes_co_do_file_flush,
LOG_FLUSH_FLAG, false);
}
static int coroutine_fn
blk_log_writes_co_pdiscard(BlockDriverState *bs, int64_t offset, int count)
{
return blk_log_writes_co_log(bs, offset, count, NULL, 0,
blk_log_writes_co_do_file_pdiscard,
LOG_DISCARD_FLAG, false);
}
static BlockDriver bdrv_blk_log_writes = {
.format_name = "blklogwrites",
.instance_size = sizeof(BDRVBlkLogWritesState),
.bdrv_open = blk_log_writes_open,
.bdrv_close = blk_log_writes_close,
.bdrv_getlength = blk_log_writes_getlength,
.bdrv_refresh_filename = blk_log_writes_refresh_filename,
.bdrv_child_perm = blk_log_writes_child_perm,
.bdrv_refresh_limits = blk_log_writes_refresh_limits,
.bdrv_co_preadv = blk_log_writes_co_preadv,
.bdrv_co_pwritev = blk_log_writes_co_pwritev,
.bdrv_co_pwrite_zeroes = blk_log_writes_co_pwrite_zeroes,
.bdrv_co_flush_to_disk = blk_log_writes_co_flush_to_disk,
.bdrv_co_pdiscard = blk_log_writes_co_pdiscard,
.bdrv_co_block_status = bdrv_co_block_status_from_file,
.is_filter = true,
};
static void bdrv_blk_log_writes_init(void)
{
bdrv_register(&bdrv_blk_log_writes);
}
block_init(bdrv_blk_log_writes_init);

2
block/crypto.c
View file

@ -551,7 +551,7 @@ static int coroutine_fn block_crypto_co_create_opts_luks(const char *filename,
/* Create protocol layer */
ret = bdrv_create_file(filename, opts, errp);
if (ret < 0) {
return ret;
goto fail;
}
bs = bdrv_open(filename, NULL, NULL,

21
block/file-posix.c
View file

@ -2111,8 +2111,9 @@ static int coroutine_fn
raw_co_create(BlockdevCreateOptions *options, Error **errp)
{
BlockdevCreateOptionsFile *file_opts;
Error *local_err = NULL;
int fd;
int perm, shared;
uint64_t perm, shared;
int result = 0;
/* Validate options and set default values */
@ -2148,7 +2149,7 @@ raw_co_create(BlockdevCreateOptions *options, Error **errp)
shared = BLK_PERM_ALL & ~BLK_PERM_RESIZE;
/* Step one: Take locks */
result = raw_apply_lock_bytes(fd, perm, shared, false, errp);
result = raw_apply_lock_bytes(fd, perm, ~shared, false, errp);
if (result < 0) {
goto out_close;
}
@ -2156,13 +2157,13 @@ raw_co_create(BlockdevCreateOptions *options, Error **errp)
/* Step two: Check that nobody else has taken conflicting locks */
result = raw_check_lock_bytes(fd, perm, shared, errp);
if (result < 0) {
goto out_close;
goto out_unlock;
}
/* Clear the file by truncating it to 0 */
result = raw_regular_truncate(NULL, fd, 0, PREALLOC_MODE_OFF, errp);
if (result < 0) {
goto out_close;
goto out_unlock;
}
if (file_opts->nocow) {
@ -2185,7 +2186,17 @@ raw_co_create(BlockdevCreateOptions *options, Error **errp)
result = raw_regular_truncate(NULL, fd, file_opts->size,
file_opts->preallocation, errp);
if (result < 0) {
goto out_close;
goto out_unlock;
}
out_unlock:
raw_apply_lock_bytes(fd, 0, 0, true, &local_err);
if (local_err) {
/* The above call should not fail, and if it does, that does
* not mean the whole creation operation has failed. So
* report it the user for their convenience, but do not report
* it to the caller. */
error_report_err(local_err);
}
out_close:

138
block/qcow2.c
View file

@ -23,11 +23,14 @@
*/
#include "qemu/osdep.h"
#define ZLIB_CONST
#include <zlib.h>
#include "block/block_int.h"
#include "block/qdict.h"
#include "sysemu/block-backend.h"
#include "qemu/module.h"
#include <zlib.h>
#include "qcow2.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
@ -41,6 +44,7 @@
#include "qapi/qobject-input-visitor.h"
#include "qapi/qapi-visit-block-core.h"
#include "crypto.h"
#include "block/thread-pool.h"
/*
Differences with QCOW:
@ -1541,6 +1545,9 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options,
qcow2_check_refcounts(bs, &result, 0);
}
#endif
qemu_co_queue_init(&s->compress_wait_queue);
return ret;
fail:
@ -3650,6 +3657,104 @@ fail:
return ret;
}
/*
* qcow2_compress()
*
* @dest - destination buffer, at least of @size-1 bytes
* @src - source buffer, @size bytes
*
* Returns: compressed size on success
* -1 if compression is inefficient
* -2 on any other error
*/
static ssize_t qcow2_compress(void *dest, const void *src, size_t size)
{
ssize_t ret;
z_stream strm;
/* best compression, small window, no zlib header */
memset(&strm, 0, sizeof(strm));
ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
-12, 9, Z_DEFAULT_STRATEGY);
if (ret != 0) {
return -2;
}
/* strm.next_in is not const in old zlib versions, such as those used on
* OpenBSD/NetBSD, so cast the const away */
strm.avail_in = size;
strm.next_in = (void *) src;
strm.avail_out = size - 1;
strm.next_out = dest;
ret = deflate(&strm, Z_FINISH);
if (ret == Z_STREAM_END) {
ret = size - 1 - strm.avail_out;
} else {
ret = (ret == Z_OK ? -1 : -2);
}
deflateEnd(&strm);
return ret;
}
#define MAX_COMPRESS_THREADS 4
typedef struct Qcow2CompressData {
void *dest;
const void *src;
size_t size;
ssize_t ret;
} Qcow2CompressData;
static int qcow2_compress_pool_func(void *opaque)
{
Qcow2CompressData *data = opaque;
data->ret = qcow2_compress(data->dest, data->src, data->size);
return 0;
}
static void qcow2_compress_complete(void *opaque, int ret)
{
qemu_coroutine_enter(opaque);
}
/* See qcow2_compress definition for parameters description */
static ssize_t qcow2_co_compress(BlockDriverState *bs,
void *dest, const void *src, size_t size)
{
BDRVQcow2State *s = bs->opaque;
BlockAIOCB *acb;
ThreadPool *pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
Qcow2CompressData arg = {
.dest = dest,
.src = src,
.size = size,
};
while (s->nb_compress_threads >= MAX_COMPRESS_THREADS) {
qemu_co_queue_wait(&s->compress_wait_queue, NULL);
}
s->nb_compress_threads++;
acb = thread_pool_submit_aio(pool, qcow2_compress_pool_func, &arg,
qcow2_compress_complete,
qemu_coroutine_self());
if (!acb) {
s->nb_compress_threads--;
return -EINVAL;
}
qemu_coroutine_yield();
s->nb_compress_threads--;
qemu_co_queue_next(&s->compress_wait_queue);
return arg.ret;
}
/* XXX: put compressed sectors first, then all the cluster aligned
tables to avoid losing bytes in alignment */
static coroutine_fn int
@ -3659,8 +3764,8 @@ qcow2_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset,
BDRVQcow2State *s = bs->opaque;
QEMUIOVector hd_qiov;
struct iovec iov;
z_stream strm;
int ret, out_len;
int ret;
size_t out_len;
uint8_t *buf, *out_buf;
int64_t cluster_offset;
@ -3694,32 +3799,11 @@ qcow2_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset,
out_buf = g_malloc(s->cluster_size);
/* best compression, small window, no zlib header */
memset(&strm, 0, sizeof(strm));
ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION,
Z_DEFLATED, -12,
9, Z_DEFAULT_STRATEGY);
if (ret != 0) {
out_len = qcow2_co_compress(bs, out_buf, buf, s->cluster_size);
if (out_len == -2) {
ret = -EINVAL;
goto fail;
}
strm.avail_in = s->cluster_size;
strm.next_in = (uint8_t *)buf;
strm.avail_out = s->cluster_size;
strm.next_out = out_buf;
ret = deflate(&strm, Z_FINISH);
if (ret != Z_STREAM_END && ret != Z_OK) {
deflateEnd(&strm);
ret = -EINVAL;
goto fail;
}
out_len = strm.next_out - out_buf;
deflateEnd(&strm);
if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
} else if (out_len == -1) {
/* could not compress: write normal cluster */
ret = qcow2_co_pwritev(bs, offset, bytes, qiov, 0);
if (ret < 0) {

3
block/qcow2.h
View file

@ -326,6 +326,9 @@ typedef struct BDRVQcow2State {
* override) */
char *image_backing_file;
char *image_backing_format;
CoQueue compress_wait_queue;
int nb_compress_threads;
} BDRVQcow2State;
typedef struct Qcow2COWRegion {

7
include/block/block.h
View file

@ -225,6 +225,13 @@ enum {
BLK_PERM_GRAPH_MOD = 0x10,
BLK_PERM_ALL = 0x1f,
DEFAULT_PERM_PASSTHROUGH = BLK_PERM_CONSISTENT_READ
| BLK_PERM_WRITE
| BLK_PERM_WRITE_UNCHANGED
| BLK_PERM_RESIZE,
DEFAULT_PERM_UNCHANGED = BLK_PERM_ALL & ~DEFAULT_PERM_PASSTHROUGH,
};
char *bdrv_perm_names(uint64_t perm);

38
qapi/block-core.json
View file

@ -2533,16 +2533,17 @@
# @throttle: Since 2.11
# @nvme: Since 2.12
# @copy-on-read: Since 3.0
# @blklogwrites: Since 3.0
#
# Since: 2.9
##
{ 'enum': 'BlockdevDriver',
'data': [ 'blkdebug', 'blkverify', 'bochs', 'cloop', 'copy-on-read',
'dmg', 'file', 'ftp', 'ftps', 'gluster', 'host_cdrom',
'host_device', 'http', 'https', 'iscsi', 'luks', 'nbd', 'nfs',
'null-aio', 'null-co', 'nvme', 'parallels', 'qcow', 'qcow2', 'qed',
'quorum', 'raw', 'rbd', 'replication', 'sheepdog', 'ssh',
'throttle', 'vdi', 'vhdx', 'vmdk', 'vpc', 'vvfat', 'vxhs' ] }
'data': [ 'blkdebug', 'blklogwrites', 'blkverify', 'bochs', 'cloop',
'copy-on-read', 'dmg', 'file', 'ftp', 'ftps', 'gluster',
'host_cdrom', 'host_device', 'http', 'https', 'iscsi', 'luks',
'nbd', 'nfs', 'null-aio', 'null-co', 'nvme', 'parallels', 'qcow',
'qcow2', 'qed', 'quorum', 'raw', 'rbd', 'replication', 'sheepdog',
'ssh', 'throttle', 'vdi', 'vhdx', 'vmdk', 'vpc', 'vvfat', 'vxhs' ] }
##
# @BlockdevOptionsFile:
@ -3044,6 +3045,30 @@
'*inject-error': ['BlkdebugInjectErrorOptions'],
'*set-state': ['BlkdebugSetStateOptions'] } }
##
# @BlockdevOptionsBlklogwrites:
#
# Driver specific block device options for blklogwrites.
#
# @file: block device
#
# @log: block device used to log writes to @file
#
# @log-sector-size: sector size used in logging writes to @file, determines
# granularity of offsets and sizes of writes (default: 512)
#
# @log-super-update-interval: interval of write requests after which the log
# super block is updated to disk (default: 4096)
#
# Since: 3.0
##
{ 'struct': 'BlockdevOptionsBlklogwrites',
'data': { 'file': 'BlockdevRef',
'log': 'BlockdevRef',
'*log-sector-size': 'uint32',
'*log-append': 'bool',
'*log-super-update-interval': 'uint64' } }
##
# @BlockdevOptionsBlkverify:
#
@ -3563,6 +3588,7 @@
'discriminator': 'driver',
'data': {
'blkdebug': 'BlockdevOptionsBlkdebug',
'blklogwrites':'BlockdevOptionsBlklogwrites',
'blkverify': 'BlockdevOptionsBlkverify',
'bochs': 'BlockdevOptionsGenericFormat',
'cloop': 'BlockdevOptionsGenericFormat',

5
qemu-img.c
View file

@ -2141,11 +2141,6 @@ static int img_convert(int argc, char **argv)
goto fail_getopt;
}
if (!s.wr_in_order && s.compressed) {
error_report("Out of order write and compress are mutually exclusive");
goto fail_getopt;
}
if (tgt_image_opts && !skip_create) {
error_report("--target-image-opts requires use of -n flag");
goto fail_getopt;

15
tests/qemu-iotests/051
View file

@ -99,6 +99,21 @@ run_qemu -drive file="$TEST_IMG",driver=foo
run_qemu -drive file="$TEST_IMG",driver=raw,format=qcow2
run_qemu -drive file="$TEST_IMG",driver=qcow2,format=qcow2
echo
echo === Node names ===
echo
# Maximum length: 31 characters
run_qemu -drive file="$TEST_IMG",node-name=x123456789012345678901234567890
run_qemu -drive file="$TEST_IMG",node-name=x1234567890123456789012345678901
# First character must be alphabetic
# Following characters alphanumeric or -._
run_qemu -drive file="$TEST_IMG",node-name=All-Types.of_all0wed_chars
run_qemu -drive file="$TEST_IMG",node-name=123foo
run_qemu -drive file="$TEST_IMG",node-name=_foo
run_qemu -drive file="$TEST_IMG",node-name=foo#12
echo
echo === Device without drive ===
echo

23
tests/qemu-iotests/051.out
View file

@ -47,6 +47,29 @@ Testing: -drive file=TEST_DIR/t.qcow2,driver=qcow2,format=qcow2
QEMU_PROG: -drive file=TEST_DIR/t.qcow2,driver=qcow2,format=qcow2: Cannot specify both 'driver' and 'format'
=== Node names ===
Testing: -drive file=TEST_DIR/t.qcow2,node-name=x123456789012345678901234567890
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) quit
Testing: -drive file=TEST_DIR/t.qcow2,node-name=x1234567890123456789012345678901
QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=x1234567890123456789012345678901: Node name too long
Testing: -drive file=TEST_DIR/t.qcow2,node-name=All-Types.of_all0wed_chars
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) quit
Testing: -drive file=TEST_DIR/t.qcow2,node-name=123foo
QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=123foo: Invalid node name
Testing: -drive file=TEST_DIR/t.qcow2,node-name=_foo
QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=_foo: Invalid node name
Testing: -drive file=TEST_DIR/t.qcow2,node-name=foo#12
QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=foo#12: Invalid node name
=== Device without drive ===
Testing: -device VIRTIO_SCSI -device scsi-hd

23
tests/qemu-iotests/051.pc.out
View file

@ -47,6 +47,29 @@ Testing: -drive file=TEST_DIR/t.qcow2,driver=qcow2,format=qcow2
QEMU_PROG: -drive file=TEST_DIR/t.qcow2,driver=qcow2,format=qcow2: Cannot specify both 'driver' and 'format'
=== Node names ===
Testing: -drive file=TEST_DIR/t.qcow2,node-name=x123456789012345678901234567890
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) quit
Testing: -drive file=TEST_DIR/t.qcow2,node-name=x1234567890123456789012345678901
QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=x1234567890123456789012345678901: Node name too long
Testing: -drive file=TEST_DIR/t.qcow2,node-name=All-Types.of_all0wed_chars
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) quit
Testing: -drive file=TEST_DIR/t.qcow2,node-name=123foo
QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=123foo: Invalid node name
Testing: -drive file=TEST_DIR/t.qcow2,node-name=_foo
QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=_foo: Invalid node name
Testing: -drive file=TEST_DIR/t.qcow2,node-name=foo#12
QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=foo#12: Invalid node name
=== Device without drive ===
Testing: -device VIRTIO_SCSI -device scsi-hd