summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorChristoph Hellwig <hch@lst.de>2009-06-20 21:10:44 +0200
committerAnthony Liguori <aliguori@us.ibm.com>2009-06-24 09:09:15 -0500
commit95533d5ffbdf3f45e8daa64477b63cf771376618 (patch)
tree0a3de929332a46ed22d550298c680f9c203f1ba5 /qemu-io.c
parentqemu-io: Fix spelling in help message. (diff)
downloadqemu-kvm-95533d5ffbdf3f45e8daa64477b63cf771376618.tar.gz
qemu-kvm-95533d5ffbdf3f45e8daa64477b63cf771376618.tar.bz2
qemu-kvm-95533d5ffbdf3f45e8daa64477b63cf771376618.zip
qemu-io: add aio read/write/flush commands
Add commands to exercise asynchronous reads/writes and to flush all outstanding aio commands. Commands to exercise aio cancellations will follow in a separate patch. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'qemu-io.c')
-rw-r--r--qemu-io.c353
1 files changed, 353 insertions, 0 deletions
diff --git a/qemu-io.c b/qemu-io.c
index 327dd3031..566ca79fc 100644
--- a/qemu-io.c
+++ b/qemu-io.c
@@ -752,6 +752,351 @@ static const cmdinfo_t writev_cmd = {
.help = writev_help,
};
+struct aio_ctx {
+ QEMUIOVector qiov;
+ int64_t offset;
+ char *buf;
+ int qflag;
+ int vflag;
+ int Cflag;
+ int Pflag;
+ int pattern;
+ struct timeval t1;
+};
+
+static void
+aio_write_done(void *opaque, int ret)
+{
+ struct aio_ctx *ctx = opaque;
+ struct timeval t2;
+ int total;
+ int cnt = 1;
+
+ gettimeofday(&t2, NULL);
+
+ total = ctx->qiov.size;
+
+ if (ret < 0) {
+ printf("aio_write failed: %s\n", strerror(-ret));
+ return;
+ }
+
+ if (ctx->qflag)
+ return;
+
+ /* Finally, report back -- -C gives a parsable format */
+ t2 = tsub(t2, ctx->t1);
+ print_report("wrote", &t2, ctx->offset, ctx->qiov.size, total, cnt,
+ ctx->Cflag);
+
+ qemu_io_free(ctx->buf);
+ free(ctx);
+}
+
+static const cmdinfo_t aio_read_cmd;
+
+static void
+aio_read_done(void *opaque, int ret)
+{
+ struct aio_ctx *ctx = opaque;
+ struct timeval t2;
+ int total;
+ int cnt = 1;
+
+ gettimeofday(&t2, NULL);
+
+ total = ctx->qiov.size;
+
+ if (ret < 0) {
+ printf("readv failed: %s\n", strerror(-ret));
+ return;
+ }
+
+ if (ctx->Pflag) {
+ void *cmp_buf = malloc(total);
+
+ memset(cmp_buf, ctx->pattern, total);
+ if (memcmp(ctx->buf, cmp_buf, total)) {
+ printf("Pattern verification failed at offset %lld, "
+ "%d bytes\n",
+ (long long) ctx->offset, total);
+ }
+ free(cmp_buf);
+ }
+
+ if (ctx->qflag)
+ return;
+
+ if (ctx->vflag)
+ dump_buffer(ctx->buf, ctx->offset, total);
+
+ /* Finally, report back -- -C gives a parsable format */
+ t2 = tsub(t2, ctx->t1);
+ print_report("read", &t2, ctx->offset, ctx->qiov.size, total, cnt,
+ ctx->Cflag);
+
+ qemu_io_free(ctx->buf);
+ free(ctx);
+
+}
+
+static void
+aio_read_help(void)
+{
+ printf(
+"\n"
+" asynchronously reads a range of bytes from the given offset\n"
+"\n"
+" Example:\n"
+" 'aio_read -v 512 1k 1k ' - dumps 2 kilobytes read from 512 bytes into the file\n"
+"\n"
+" Reads a segment of the currently open file, optionally dumping it to the\n"
+" standard output stream (with -v option) for subsequent inspection.\n"
+" The read is performed asynchronously and should the aio_flush command \n"
+" should be used to ensure all outstanding aio requests have been completed\n"
+" -C, -- report statistics in a machine parsable format\n"
+" -P, -- use a pattern to verify read data\n"
+" -v, -- dump buffer to standard output\n"
+" -q, -- quite mode, do not show I/O statistics\n"
+"\n");
+}
+
+static int
+aio_read_f(int argc, char **argv)
+{
+ char *p;
+ int count = 0;
+ int nr_iov, i, c;
+ struct aio_ctx *ctx = calloc(1, sizeof(struct aio_ctx));
+ BlockDriverAIOCB *acb;
+
+ ctx->pattern = 0xcd;
+
+ while ((c = getopt(argc, argv, "CP:qv")) != EOF) {
+ switch (c) {
+ case 'C':
+ ctx->Cflag = 1;
+ break;
+ case 'P':
+ ctx->Pflag = 1;
+ ctx->pattern = atoi(optarg);
+ break;
+ case 'q':
+ ctx->qflag = 1;
+ break;
+ case 'v':
+ ctx->vflag = 1;
+ break;
+ default:
+ return command_usage(&aio_read_cmd);
+ }
+ }
+
+ if (optind > argc - 2)
+ return command_usage(&aio_read_cmd);
+
+
+ ctx->offset = cvtnum(argv[optind]);
+ if (ctx->offset < 0) {
+ printf("non-numeric length argument -- %s\n", argv[optind]);
+ return 0;
+ }
+ optind++;
+
+ if (ctx->offset & 0x1ff) {
+ printf("offset %lld is not sector aligned\n",
+ (long long)ctx->offset);
+ return 0;
+ }
+
+ if (count & 0x1ff) {
+ printf("count %d is not sector aligned\n",
+ count);
+ return 0;
+ }
+
+ for (i = optind; i < argc; i++) {
+ size_t len;
+
+ len = cvtnum(argv[i]);
+ if (len < 0) {
+ printf("non-numeric length argument -- %s\n", argv[i]);
+ return 0;
+ }
+ count += len;
+ }
+
+ nr_iov = argc - optind;
+ qemu_iovec_init(&ctx->qiov, nr_iov);
+ ctx->buf = p = qemu_io_alloc(count, 0xab);
+ for (i = 0; i < nr_iov; i++) {
+ size_t len;
+
+ len = cvtnum(argv[optind]);
+ if (len < 0) {
+ printf("non-numeric length argument -- %s\n",
+ argv[optind]);
+ return 0;
+ }
+
+ qemu_iovec_add(&ctx->qiov, p, len);
+ p += len;
+ optind++;
+ }
+
+ gettimeofday(&ctx->t1, NULL);
+ acb = bdrv_aio_readv(bs, ctx->offset >> 9, &ctx->qiov,
+ ctx->qiov.size >> 9, aio_read_done, ctx);
+ if (!acb)
+ return -EIO;
+
+ return 0;
+}
+
+static const cmdinfo_t aio_read_cmd = {
+ .name = "aio_read",
+ .cfunc = aio_read_f,
+ .argmin = 2,
+ .argmax = -1,
+ .args = "[-Cqv] [-P pattern ] off len [len..]",
+ .oneline = "asynchronously reads a number of bytes",
+ .help = aio_read_help,
+};
+
+static const cmdinfo_t aio_write_cmd;
+
+static void
+aio_write_help(void)
+{
+ printf(
+"\n"
+" asynchronously writes a range of bytes from the given offset source \n"
+" from multiple buffers\n"
+"\n"
+" Example:\n"
+" 'aio_write 512 1k 1k' - writes 2 kilobytes at 512 bytes into the open file\n"
+"\n"
+" Writes into a segment of the currently open file, using a buffer\n"
+" filled with a set pattern (0xcdcdcdcd).\n"
+" The write is performed asynchronously and should the aio_flush command \n"
+" should be used to ensure all outstanding aio requests have been completed\n"
+" -P, -- use different pattern to fill file\n"
+" -C, -- report statistics in a machine parsable format\n"
+" -q, -- quite mode, do not show I/O statistics\n"
+"\n");
+}
+
+
+static int
+aio_write_f(int argc, char **argv)
+{
+ char *p;
+ int count = 0;
+ int nr_iov, i, c;
+ int pattern = 0xcd;
+ struct aio_ctx *ctx = calloc(1, sizeof(struct aio_ctx));
+ BlockDriverAIOCB *acb;
+
+ while ((c = getopt(argc, argv, "CqP:")) != EOF) {
+ switch (c) {
+ case 'C':
+ ctx->Cflag = 1;
+ break;
+ case 'q':
+ ctx->qflag = 1;
+ break;
+ case 'P':
+ pattern = atoi(optarg);
+ break;
+ default:
+ return command_usage(&aio_write_cmd);
+ }
+ }
+
+ if (optind > argc - 2)
+ return command_usage(&aio_write_cmd);
+
+ ctx->offset = cvtnum(argv[optind]);
+ if (ctx->offset < 0) {
+ printf("non-numeric length argument -- %s\n", argv[optind]);
+ return 0;
+ }
+ optind++;
+
+ if (ctx->offset & 0x1ff) {
+ printf("offset %lld is not sector aligned\n",
+ (long long)ctx->offset);
+ return 0;
+ }
+
+ if (count & 0x1ff) {
+ printf("count %d is not sector aligned\n",
+ count);
+ return 0;
+ }
+
+
+ for (i = optind; i < argc; i++) {
+ size_t len;
+
+ len = cvtnum(argv[optind]);
+ if (len < 0) {
+ printf("non-numeric length argument -- %s\n", argv[i]);
+ return 0;
+ }
+ count += len;
+ }
+
+ nr_iov = argc - optind;
+ qemu_iovec_init(&ctx->qiov, nr_iov);
+ ctx->buf = p = qemu_io_alloc(count, pattern);
+ for (i = 0; i < nr_iov; i++) {
+ size_t len;
+
+ len = cvtnum(argv[optind]);
+ if (len < 0) {
+ printf("non-numeric length argument -- %s\n",
+ argv[optind]);
+ return 0;
+ }
+
+ qemu_iovec_add(&ctx->qiov, p, len);
+ p += len;
+ optind++;
+ }
+
+ gettimeofday(&ctx->t1, NULL);
+ acb = bdrv_aio_writev(bs, ctx->offset >> 9, &ctx->qiov,
+ ctx->qiov.size >> 9, aio_write_done, ctx);
+ if (!acb)
+ return -EIO;
+
+ return 0;
+}
+
+static const cmdinfo_t aio_write_cmd = {
+ .name = "aio_write",
+ .cfunc = aio_write_f,
+ .argmin = 2,
+ .argmax = -1,
+ .args = "[-Cq] [-P pattern ] off len [len..]",
+ .oneline = "asynchronously writes a number of bytes",
+ .help = aio_write_help,
+};
+
+static int
+aio_flush_f(int argc, char **argv)
+{
+ qemu_aio_flush();
+ return 0;
+}
+
+static const cmdinfo_t aio_flush_cmd = {
+ .name = "aio_flush",
+ .cfunc = aio_flush_f,
+ .oneline = "completes all outstanding aio requets"
+};
+
static int
flush_f(int argc, char **argv)
{
@@ -1118,6 +1463,9 @@ int main(int argc, char **argv)
add_command(&readv_cmd);
add_command(&write_cmd);
add_command(&writev_cmd);
+ add_command(&aio_read_cmd);
+ add_command(&aio_write_cmd);
+ add_command(&aio_flush_cmd);
add_command(&flush_cmd);
add_command(&truncate_cmd);
add_command(&length_cmd);
@@ -1137,6 +1485,11 @@ int main(int argc, char **argv)
openfile(argv[optind], flags);
command_loop();
+ /*
+ * Make sure all outstanding requests get flushed the program exits.
+ */
+ qemu_aio_flush();
+
if (bs)
bdrv_close(bs);
return 0;