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bh=LwrZPTSNJGjGvzZg0Qjg/zNDTAb5Iq/wz9PFWsOsojo=; b=Nbylix82Lmy7jnmcrIKuEj4+Ww6+NwYOrF5cuAIKn4VDGPhIqfTyEdh1s2jvmcosqOGQu4 1MSHo13MpaVqrcvIR5eaX9n5wzC82AAgjZvT7Rq0QErKVoFHZ8bKhJqul3qwMBZYsW4pt1 n8IpfR3j/5J9PTBtEIKGqONWuQpceTE= X-MC-Unique: B0Z-SlS5OPi7m5ad8zd_3A-1 From: Stefan Hajnoczi To: qemu-devel@nongnu.org Cc: Fam Zheng , Kevin Wolf , Hanna Reitz , Stefan Hajnoczi , qemu-block@nongnu.org, Fiona Ebner Subject: [PATCH 3/4] qemu-io: add -r option to register I/O buffer Date: Thu, 26 Jan 2023 15:14:00 -0500 Message-Id: <20230126201401.348845-4-stefanha@redhat.com> In-Reply-To: <20230126201401.348845-1-stefanha@redhat.com> References: <20230126201401.348845-1-stefanha@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1674764237783100002 Content-Type: text/plain; charset="utf-8" The blk_register_buf() API is an optimization hint that allows some block drivers to avoid I/O buffer housekeeping or bounce buffers. Add an -r option to register the I/O buffer so that qemu-io can be used to test the blk_register_buf() API. The next commit will add a test that uses the new option. Signed-off-by: Stefan Hajnoczi --- qemu-io-cmds.c | 149 ++++++++++++++++++++++++++++++++++--------------- 1 file changed, 103 insertions(+), 46 deletions(-) diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c index c0125d14c0..7e557082cd 100644 --- a/qemu-io-cmds.c +++ b/qemu-io-cmds.c @@ -338,7 +338,8 @@ static int parse_pattern(const char *arg) */ =20 #define MISALIGN_OFFSET 16 -static void *qemu_io_alloc(BlockBackend *blk, size_t len, int pattern) +static void *qemu_io_alloc(BlockBackend *blk, size_t len, int pattern, + bool register_buf) { void *buf; =20 @@ -347,17 +348,24 @@ static void *qemu_io_alloc(BlockBackend *blk, size_t = len, int pattern) } buf =3D blk_blockalign(blk, len); memset(buf, pattern, len); + if (register_buf) { + blk_register_buf(blk, buf, len, &error_abort); + } if (qemuio_misalign) { buf +=3D MISALIGN_OFFSET; } return buf; } =20 -static void qemu_io_free(void *p) +static void qemu_io_free(BlockBackend *blk, void *p, size_t len, + bool unregister_buf) { if (qemuio_misalign) { p -=3D MISALIGN_OFFSET; } + if (unregister_buf) { + blk_unregister_buf(blk, p, len); + } qemu_vfree(p); } =20 @@ -371,12 +379,13 @@ static void qemu_io_free(void *p) * @blk - the block backend where the buffer content is going to be writte= n to * @len - the buffer length * @file_name - the file to read the content from + * @register_buf - call blk_register_buf() * * Returns: the buffer pointer on success * NULL on error */ static void *qemu_io_alloc_from_file(BlockBackend *blk, size_t len, - const char *file_name) + const char *file_name, bool register_= buf) { char *buf, *buf_origin; FILE *f =3D fopen(file_name, "r"); @@ -414,6 +423,10 @@ static void *qemu_io_alloc_from_file(BlockBackend *blk= , size_t len, fclose(f); f =3D NULL; =20 + if (register_buf) { + blk_register_buf(blk, buf_origin, len, &error_abort); + } + if (len > pattern_len) { len -=3D pattern_len; buf +=3D pattern_len; @@ -431,7 +444,7 @@ static void *qemu_io_alloc_from_file(BlockBackend *blk,= size_t len, return buf_origin; =20 error: - qemu_io_free(buf_origin); + qemu_io_free(blk, buf_origin, len, false); if (f) { fclose(f); } @@ -490,7 +503,7 @@ static void print_report(const char *op, struct timespe= c *t, int64_t offset, */ static void * create_iovec(BlockBackend *blk, QEMUIOVector *qiov, char **argv, int nr_io= v, - int pattern) + int pattern, bool register_buf) { size_t *sizes =3D g_new0(size_t, nr_iov); size_t count =3D 0; @@ -526,7 +539,7 @@ create_iovec(BlockBackend *blk, QEMUIOVector *qiov, cha= r **argv, int nr_iov, =20 qemu_iovec_init(qiov, nr_iov); =20 - buf =3D p =3D qemu_io_alloc(blk, count, pattern); + buf =3D p =3D qemu_io_alloc(blk, count, pattern, register_buf); =20 for (i =3D 0; i < nr_iov; i++) { qemu_iovec_add(qiov, p, sizes[i]); @@ -539,7 +552,7 @@ fail: } =20 static int do_pread(BlockBackend *blk, char *buf, int64_t offset, - int64_t bytes, int64_t *total) + int64_t bytes, BdrvRequestFlags flags, int64_t *total) { int ret; =20 @@ -547,7 +560,7 @@ static int do_pread(BlockBackend *blk, char *buf, int64= _t offset, return -ERANGE; } =20 - ret =3D blk_pread(blk, offset, bytes, (uint8_t *)buf, 0); + ret =3D blk_pread(blk, offset, bytes, (uint8_t *)buf, flags); if (ret < 0) { return ret; } @@ -675,11 +688,11 @@ static void aio_rw_done(void *opaque, int ret) } =20 static int do_aio_readv(BlockBackend *blk, QEMUIOVector *qiov, - int64_t offset, int *total) + int64_t offset, BdrvRequestFlags flags, int *total) { int async_ret =3D NOT_DONE; =20 - blk_aio_preadv(blk, offset, qiov, 0, aio_rw_done, &async_ret); + blk_aio_preadv(blk, offset, qiov, flags, aio_rw_done, &async_ret); while (async_ret =3D=3D NOT_DONE) { main_loop_wait(false); } @@ -719,6 +732,7 @@ static void read_help(void) " -p, -- ignored for backwards compatibility\n" " -P, -- use a pattern to verify read data\n" " -q, -- quiet mode, do not show I/O statistics\n" +" -r, -- register I/O buffer\n" " -s, -- start offset for pattern verification (only with -P)\n" " -v, -- dump buffer to standard output\n" "\n"); @@ -732,7 +746,7 @@ static const cmdinfo_t read_cmd =3D { .cfunc =3D read_f, .argmin =3D 2, .argmax =3D -1, - .args =3D "[-abCqv] [-P pattern [-s off] [-l len]] off len", + .args =3D "[-abCqrv] [-P pattern [-s off] [-l len]] off len", .oneline =3D "reads a number of bytes at a specified offset", .help =3D read_help, }; @@ -750,6 +764,7 @@ static int read_f(BlockBackend *blk, int argc, char **a= rgv) int64_t total =3D 0; int pattern =3D 0; int64_t pattern_offset =3D 0, pattern_count =3D 0; + BdrvRequestFlags flags =3D 0; =20 while ((c =3D getopt(argc, argv, "bCl:pP:qs:v")) !=3D -1) { switch (c) { @@ -780,6 +795,9 @@ static int read_f(BlockBackend *blk, int argc, char **a= rgv) case 'q': qflag =3D true; break; + case 'r': + flags |=3D BDRV_REQ_REGISTERED_BUF; + break; case 's': sflag =3D true; pattern_offset =3D cvtnum(optarg); @@ -844,15 +862,20 @@ static int read_f(BlockBackend *blk, int argc, char *= *argv) count); return -EINVAL; } + if (flags & BDRV_REQ_REGISTERED_BUF) { + printf("I/O buffer registration is not supported when reading " + "from vmstate\n"); + return -EINVAL; + } } =20 - buf =3D qemu_io_alloc(blk, count, 0xab); + buf =3D qemu_io_alloc(blk, count, 0xab, flags & BDRV_REQ_REGISTERED_BU= F); =20 clock_gettime(CLOCK_MONOTONIC, &t1); if (bflag) { ret =3D do_load_vmstate(blk, buf, offset, count, &total); } else { - ret =3D do_pread(blk, buf, offset, count, &total); + ret =3D do_pread(blk, buf, offset, count, flags, &total); } clock_gettime(CLOCK_MONOTONIC, &t2); =20 @@ -889,7 +912,7 @@ static int read_f(BlockBackend *blk, int argc, char **a= rgv) print_report("read", &t2, offset, count, total, cnt, Cflag); =20 out: - qemu_io_free(buf); + qemu_io_free(blk, buf, count, flags & BDRV_REQ_REGISTERED_BUF); return ret; } =20 @@ -909,6 +932,7 @@ static void readv_help(void) " -P, -- use a pattern to verify read data\n" " -v, -- dump buffer to standard output\n" " -q, -- quiet mode, do not show I/O statistics\n" +" -r, -- register I/O buffer\n" "\n"); } =20 @@ -919,7 +943,7 @@ static const cmdinfo_t readv_cmd =3D { .cfunc =3D readv_f, .argmin =3D 2, .argmax =3D -1, - .args =3D "[-Cqv] [-P pattern] off len [len..]", + .args =3D "[-Cqrv] [-P pattern] off len [len..]", .oneline =3D "reads a number of bytes at a specified offset", .help =3D readv_help, }; @@ -937,8 +961,9 @@ static int readv_f(BlockBackend *blk, int argc, char **= argv) QEMUIOVector qiov; int pattern =3D 0; bool Pflag =3D false; + BdrvRequestFlags flags =3D 0; =20 - while ((c =3D getopt(argc, argv, "CP:qv")) !=3D -1) { + while ((c =3D getopt(argc, argv, "CP:qrv")) !=3D -1) { switch (c) { case 'C': Cflag =3D true; @@ -953,6 +978,9 @@ static int readv_f(BlockBackend *blk, int argc, char **= argv) case 'q': qflag =3D true; break; + case 'r': + flags |=3D BDRV_REQ_REGISTERED_BUF; + break; case 'v': vflag =3D true; break; @@ -976,13 +1004,14 @@ static int readv_f(BlockBackend *blk, int argc, char= **argv) optind++; =20 nr_iov =3D argc - optind; - buf =3D create_iovec(blk, &qiov, &argv[optind], nr_iov, 0xab); + buf =3D create_iovec(blk, &qiov, &argv[optind], nr_iov, 0xab, + flags & BDRV_REQ_REGISTERED_BUF); if (buf =3D=3D NULL) { return -EINVAL; } =20 clock_gettime(CLOCK_MONOTONIC, &t1); - ret =3D do_aio_readv(blk, &qiov, offset, &total); + ret =3D do_aio_readv(blk, &qiov, offset, flags, &total); clock_gettime(CLOCK_MONOTONIC, &t2); =20 if (ret < 0) { @@ -1017,8 +1046,8 @@ static int readv_f(BlockBackend *blk, int argc, char = **argv) print_report("read", &t2, offset, qiov.size, total, cnt, Cflag); =20 out: + qemu_io_free(blk, buf, qiov.size, flags & BDRV_REQ_REGISTERED_BUF); qemu_iovec_destroy(&qiov); - qemu_io_free(buf); return ret; } =20 @@ -1042,6 +1071,7 @@ static void write_help(void) " -s, -- use a pattern file to fill the write buffer\n" " -C, -- report statistics in a machine parsable format\n" " -q, -- quiet mode, do not show I/O statistics\n" +" -r, -- register I/O buffer\n" " -u, -- with -z, allow unmapping\n" " -z, -- write zeroes using blk_co_pwrite_zeroes\n" "\n"); @@ -1056,7 +1086,7 @@ static const cmdinfo_t write_cmd =3D { .perm =3D BLK_PERM_WRITE, .argmin =3D 2, .argmax =3D -1, - .args =3D "[-bcCfnquz] [-P pattern | -s source_file] off len", + .args =3D "[-bcCfnqruz] [-P pattern | -s source_file] off len", .oneline =3D "writes a number of bytes at a specified offset", .help =3D write_help, }; @@ -1076,7 +1106,7 @@ static int write_f(BlockBackend *blk, int argc, char = **argv) int pattern =3D 0xcd; const char *file_name =3D NULL; =20 - while ((c =3D getopt(argc, argv, "bcCfnpP:qs:uz")) !=3D -1) { + while ((c =3D getopt(argc, argv, "bcCfnpP:qrs:uz")) !=3D -1) { switch (c) { case 'b': bflag =3D true; @@ -1106,6 +1136,9 @@ static int write_f(BlockBackend *blk, int argc, char = **argv) case 'q': qflag =3D true; break; + case 'r': + flags |=3D BDRV_REQ_REGISTERED_BUF; + break; case 's': sflag =3D true; file_name =3D optarg; @@ -1185,14 +1218,21 @@ static int write_f(BlockBackend *blk, int argc, cha= r **argv) } } =20 - if (!zflag) { + if (zflag) { + if (flags & BDRV_REQ_REGISTERED_BUF) { + printf("cannot combine zero write with register I/O buffer\n"); + return -EINVAL; + } + } else { if (sflag) { - buf =3D qemu_io_alloc_from_file(blk, count, file_name); + buf =3D qemu_io_alloc_from_file(blk, count, file_name, + flags & BDRV_REQ_REGISTERED_BUF); if (!buf) { return -EINVAL; } } else { - buf =3D qemu_io_alloc(blk, count, pattern); + buf =3D qemu_io_alloc(blk, count, pattern, + flags & BDRV_REQ_REGISTERED_BUF); } } =20 @@ -1226,7 +1266,7 @@ static int write_f(BlockBackend *blk, int argc, char = **argv) =20 out: if (!zflag) { - qemu_io_free(buf); + qemu_io_free(blk, buf, count, flags & BDRV_REQ_REGISTERED_BUF); } return ret; } @@ -1247,6 +1287,7 @@ writev_help(void) " -C, -- report statistics in a machine parsable format\n" " -f, -- use Force Unit Access semantics\n" " -q, -- quiet mode, do not show I/O statistics\n" +" -r, -- register I/O buffer\n" "\n"); } =20 @@ -1258,7 +1299,7 @@ static const cmdinfo_t writev_cmd =3D { .perm =3D BLK_PERM_WRITE, .argmin =3D 2, .argmax =3D -1, - .args =3D "[-Cfq] [-P pattern] off len [len..]", + .args =3D "[-Cfqr] [-P pattern] off len [len..]", .oneline =3D "writes a number of bytes at a specified offset", .help =3D writev_help, }; @@ -1277,7 +1318,7 @@ static int writev_f(BlockBackend *blk, int argc, char= **argv) int pattern =3D 0xcd; QEMUIOVector qiov; =20 - while ((c =3D getopt(argc, argv, "CfqP:")) !=3D -1) { + while ((c =3D getopt(argc, argv, "CfqrP:")) !=3D -1) { switch (c) { case 'C': Cflag =3D true; @@ -1288,6 +1329,9 @@ static int writev_f(BlockBackend *blk, int argc, char= **argv) case 'q': qflag =3D true; break; + case 'r': + flags |=3D BDRV_REQ_REGISTERED_BUF; + break; case 'P': pattern =3D parse_pattern(optarg); if (pattern < 0) { @@ -1313,7 +1357,8 @@ static int writev_f(BlockBackend *blk, int argc, char= **argv) optind++; =20 nr_iov =3D argc - optind; - buf =3D create_iovec(blk, &qiov, &argv[optind], nr_iov, pattern); + buf =3D create_iovec(blk, &qiov, &argv[optind], nr_iov, pattern, + flags & BDRV_REQ_REGISTERED_BUF); if (buf =3D=3D NULL) { return -EINVAL; } @@ -1338,8 +1383,8 @@ static int writev_f(BlockBackend *blk, int argc, char= **argv) t2 =3D tsub(t2, t1); print_report("wrote", &t2, offset, qiov.size, total, cnt, Cflag); out: + qemu_io_free(blk, buf, qiov.size, flags & BDRV_REQ_REGISTERED_BUF); qemu_iovec_destroy(&qiov); - qemu_io_free(buf); return ret; } =20 @@ -1355,6 +1400,7 @@ struct aio_ctx { bool zflag; BlockAcctCookie acct; int pattern; + BdrvRequestFlags flags; struct timespec t1; }; =20 @@ -1384,8 +1430,9 @@ static void aio_write_done(void *opaque, int ret) ctx->qiov.size, 1, ctx->Cflag); out: if (!ctx->zflag) { - qemu_io_free(ctx->buf); qemu_iovec_destroy(&ctx->qiov); + qemu_io_free(ctx->blk, ctx->buf, ctx->qiov.size, + ctx->flags & BDRV_REQ_REGISTERED_BUF); } g_free(ctx); } @@ -1429,7 +1476,8 @@ static void aio_read_done(void *opaque, int ret) print_report("read", &t2, ctx->offset, ctx->qiov.size, ctx->qiov.size, 1, ctx->Cflag); out: - qemu_io_free(ctx->buf); + qemu_io_free(ctx->blk, ctx->buf, ctx->qiov.size, + ctx->flags & BDRV_REQ_REGISTERED_BUF); qemu_iovec_destroy(&ctx->qiov); g_free(ctx); } @@ -1455,6 +1503,7 @@ static void aio_read_help(void) " -i, -- treat request as invalid, for exercising stats\n" " -v, -- dump buffer to standard output\n" " -q, -- quiet mode, do not show I/O statistics\n" +" -r, -- register I/O buffer\n" "\n"); } =20 @@ -1465,7 +1514,7 @@ static const cmdinfo_t aio_read_cmd =3D { .cfunc =3D aio_read_f, .argmin =3D 2, .argmax =3D -1, - .args =3D "[-Ciqv] [-P pattern] off len [len..]", + .args =3D "[-Ciqrv] [-P pattern] off len [len..]", .oneline =3D "asynchronously reads a number of bytes", .help =3D aio_read_help, }; @@ -1476,7 +1525,7 @@ static int aio_read_f(BlockBackend *blk, int argc, ch= ar **argv) struct aio_ctx *ctx =3D g_new0(struct aio_ctx, 1); =20 ctx->blk =3D blk; - while ((c =3D getopt(argc, argv, "CP:iqv")) !=3D -1) { + while ((c =3D getopt(argc, argv, "CP:iqrv")) !=3D -1) { switch (c) { case 'C': ctx->Cflag =3D true; @@ -1497,6 +1546,9 @@ static int aio_read_f(BlockBackend *blk, int argc, ch= ar **argv) case 'q': ctx->qflag =3D true; break; + case 'r': + ctx->flags |=3D BDRV_REQ_REGISTERED_BUF; + break; case 'v': ctx->vflag =3D true; break; @@ -1523,7 +1575,8 @@ static int aio_read_f(BlockBackend *blk, int argc, ch= ar **argv) optind++; =20 nr_iov =3D argc - optind; - ctx->buf =3D create_iovec(blk, &ctx->qiov, &argv[optind], nr_iov, 0xab= ); + ctx->buf =3D create_iovec(blk, &ctx->qiov, &argv[optind], nr_iov, 0xab, + ctx->flags & BDRV_REQ_REGISTERED_BUF); if (ctx->buf =3D=3D NULL) { block_acct_invalid(blk_get_stats(blk), BLOCK_ACCT_READ); g_free(ctx); @@ -1533,7 +1586,8 @@ static int aio_read_f(BlockBackend *blk, int argc, ch= ar **argv) clock_gettime(CLOCK_MONOTONIC, &ctx->t1); block_acct_start(blk_get_stats(blk), &ctx->acct, ctx->qiov.size, BLOCK_ACCT_READ); - blk_aio_preadv(blk, ctx->offset, &ctx->qiov, 0, aio_read_done, ctx); + blk_aio_preadv(blk, ctx->offset, &ctx->qiov, ctx->flags, aio_read_done, + ctx); return 0; } =20 @@ -1559,6 +1613,7 @@ static void aio_write_help(void) " -f, -- use Force Unit Access semantics\n" " -i, -- treat request as invalid, for exercising stats\n" " -q, -- quiet mode, do not show I/O statistics\n" +" -r, -- register I/O buffer\n" " -u, -- with -z, allow unmapping\n" " -z, -- write zeroes using blk_aio_pwrite_zeroes\n" "\n"); @@ -1572,7 +1627,7 @@ static const cmdinfo_t aio_write_cmd =3D { .perm =3D BLK_PERM_WRITE, .argmin =3D 2, .argmax =3D -1, - .args =3D "[-Cfiquz] [-P pattern] off len [len..]", + .args =3D "[-Cfiqruz] [-P pattern] off len [len..]", .oneline =3D "asynchronously writes a number of bytes", .help =3D aio_write_help, }; @@ -1582,22 +1637,24 @@ static int aio_write_f(BlockBackend *blk, int argc,= char **argv) int nr_iov, c; int pattern =3D 0xcd; struct aio_ctx *ctx =3D g_new0(struct aio_ctx, 1); - BdrvRequestFlags flags =3D 0; =20 ctx->blk =3D blk; - while ((c =3D getopt(argc, argv, "CfiqP:uz")) !=3D -1) { + while ((c =3D getopt(argc, argv, "CfiqrP:uz")) !=3D -1) { switch (c) { case 'C': ctx->Cflag =3D true; break; case 'f': - flags |=3D BDRV_REQ_FUA; + ctx->flags |=3D BDRV_REQ_FUA; break; case 'q': ctx->qflag =3D true; break; + case 'r': + ctx->flags |=3D BDRV_REQ_REGISTERED_BUF; + break; case 'u': - flags |=3D BDRV_REQ_MAY_UNMAP; + ctx->flags |=3D BDRV_REQ_MAY_UNMAP; break; case 'P': pattern =3D parse_pattern(optarg); @@ -1633,7 +1690,7 @@ static int aio_write_f(BlockBackend *blk, int argc, c= har **argv) return -EINVAL; } =20 - if ((flags & BDRV_REQ_MAY_UNMAP) && !ctx->zflag) { + if ((ctx->flags & BDRV_REQ_MAY_UNMAP) && !ctx->zflag) { printf("-u requires -z to be specified\n"); g_free(ctx); return -EINVAL; @@ -1663,12 +1720,12 @@ static int aio_write_f(BlockBackend *blk, int argc,= char **argv) } =20 ctx->qiov.size =3D count; - blk_aio_pwrite_zeroes(blk, ctx->offset, count, flags, aio_write_do= ne, - ctx); + blk_aio_pwrite_zeroes(blk, ctx->offset, count, ctx->flags, + aio_write_done, ctx); } else { nr_iov =3D argc - optind; ctx->buf =3D create_iovec(blk, &ctx->qiov, &argv[optind], nr_iov, - pattern); + pattern, ctx->flags & BDRV_REQ_REGISTERED_= BUF); if (ctx->buf =3D=3D NULL) { block_acct_invalid(blk_get_stats(blk), BLOCK_ACCT_WRITE); g_free(ctx); @@ -1679,8 +1736,8 @@ static int aio_write_f(BlockBackend *blk, int argc, c= har **argv) block_acct_start(blk_get_stats(blk), &ctx->acct, ctx->qiov.size, BLOCK_ACCT_WRITE); =20 - blk_aio_pwritev(blk, ctx->offset, &ctx->qiov, flags, aio_write_don= e, - ctx); + blk_aio_pwritev(blk, ctx->offset, &ctx->qiov, ctx->flags, + aio_write_done, ctx); } =20 return 0; --=20 2.39.1