On Wed, Jul 29, 2020 at 02:23:20AM +0800, Zorro Lang wrote:
> New IO_URING test for fsx, use -U option to enable IO_URING test.
>
> Signed-off-by: Zorro Lang <zlang@xxxxxxxxxx>
> ---
> ltp/fsx.c | 154 +++++++++++++++++++++++++++++++++++++++++++++++++-----
> 1 file changed, 140 insertions(+), 14 deletions(-)
>
> diff --git a/ltp/fsx.c b/ltp/fsx.c
> index 7c76655a..1b7401a2 100644
> --- a/ltp/fsx.c
> +++ b/ltp/fsx.c
> @@ -34,6 +34,9 @@
> #ifdef AIO
> #include <libaio.h>
> #endif
> +#ifdef URING
> +#include <liburing.h>
> +#endif
> #include <sys/syscall.h>
>
> #ifndef MAP_FILE
> @@ -176,21 +179,17 @@ int integrity = 0; /* -i flag */
> int fsxgoodfd = 0;
> int o_direct; /* -Z */
> int aio = 0;
> +int uring = 0;
> int mark_nr = 0;
>
> int page_size;
> int page_mask;
> int mmap_mask;
> -#ifdef AIO
> -int aio_rw(int rw, int fd, char *buf, unsigned len, unsigned offset);
> +int fsx_rw(int rw, int fd, char *buf, unsigned len, unsigned offset);
> #define READ 0
> #define WRITE 1
> -#define fsxread(a,b,c,d) aio_rw(READ, a,b,c,d)
> -#define fsxwrite(a,b,c,d) aio_rw(WRITE, a,b,c,d)
> -#else
> -#define fsxread(a,b,c,d) read(a,b,c)
> -#define fsxwrite(a,b,c,d) write(a,b,c)
> -#endif
> +#define fsxread(a,b,c,d) fsx_rw(READ, a,b,c,d)
> +#define fsxwrite(a,b,c,d) fsx_rw(WRITE, a,b,c,d)
>
> const char *replayops = NULL;
> const char *recordops = NULL;
> @@ -2242,7 +2241,7 @@ void
> usage(void)
> {
> fprintf(stdout, "usage: %s",
> - "fsx [-dknqxABEFJLOWZ] [-b opnum] [-c Prob] [-g filldata] [-i logdev] [-j logid] [-l flen] [-m start:end] [-o oplen] [-p progressinterval] [-r readbdy] [-s style] [-t truncbdy] [-w writebdy] [-D startingop] [-N numops] [-P dirpath] [-S seed] fname\n\
> + "fsx [-dknqxBEFJLOWZ][-A|-U] [-b opnum] [-c Prob] [-g filldata] [-i logdev] [-j logid] [-l flen] [-m start:end] [-o oplen] [-p progressinterval] [-r readbdy] [-s style] [-t truncbdy] [-w writebdy] [-D startingop] [-N numops] [-P dirpath] [-S seed] fname\n\
> -b opnum: beginning operation number (default 1)\n\
> -c P: 1 in P chance of file close+open at each op (default infinity)\n\
> -d: debug output for all operations\n\
> @@ -2265,7 +2264,10 @@ usage(void)
> -y synchronize changes to a file\n"
>
> #ifdef AIO
> -" -A: Use the AIO system calls\n"
> +" -A: Use the AIO system calls, -A excludes -U\n"
> +#endif
> +#ifdef URING
> +" -U: Use the IO_URING system calls, -U excludes -A\n"
> #endif
> " -D startingop: debug output starting at specified operation\n"
> #ifdef HAVE_LINUX_FALLOC_H
> @@ -2425,13 +2427,127 @@ out_error:
> errno = -ret;
> return -1;
> }
> +#endif
> +
> +#ifdef URING
> +struct io_uring ring;
> +#define URING_ENTRIES 1024
> +int
> +uring_setup()
> +{
> + int ret;
> +
> + ret = io_uring_queue_init(URING_ENTRIES, &ring, 0);
> + if (ret != 0) {
> + fprintf(stderr, "uring_setup: io_uring_queue_init failed: %s\n",
> + strerror(ret));
> + return -1;
> + }
> + return 0;
> +}
>
> -int aio_rw(int rw, int fd, char *buf, unsigned len, unsigned offset)
> +int
> +__uring_rw(int rw, int fd, char *buf, unsigned len, unsigned offset)
> {
> + struct io_uring_sqe *sqe;
> + struct io_uring_cqe *cqe;
> int ret;
> + int res, res2 = 0;
> + char *p = buf;
> + unsigned l = len;
> + unsigned o = offset;
> +
> + /*
> + * Due to io_uring tries non-blocking IOs (especially read), that
> + * always cause 'normal' short reading. To avoid this short read
> + * fail, try to loop read/write (escpecilly read) data.
> + */
> + uring_loop:
> + sqe = io_uring_get_sqe(&ring);
> + if (!sqe) {
> + fprintf(stderr, "uring_rw: io_uring_get_sqe failed: %s\n",
> + strerror(errno));
> + return -1;
> + }
> +
> + if (rw == READ) {
> + io_uring_prep_read(sqe, fd, p, l, o);
> + } else {
> + io_uring_prep_write(sqe, fd, p, l, o);
I just found some old version liburing doesn't support io_uring_prep_read() and
io_uring_prep_write() functions:
# make
...
/tmp/ccmrsUN8.o: In function `__uring_rw':
/home/xfstests-zlang/ltp/fsx.c:2474: undefined reference to `io_uring_prep_read'
/home/xfstests-zlang/ltp/fsx.c:2476: undefined reference to `io_uring_prep_write'
collect2: error: ld returned 1 exit status
...
# grep -rsn io_uring_prep_read /usr/include/liburing.h
189:static inline void io_uring_prep_readv(struct io_uring_sqe *sqe, int fd,
196:static inline void io_uring_prep_read_fixed(struct io_uring_sqe *sqe, int fd,
# rpm -q liburing
liburing-0.2-2.xxx.xxxx
I'll turn to use io_uring_prep_readv() and io_uring_prep_writev() to get better
compatibility.
Thanks,
Zorro
> + }
> +
> + ret = io_uring_submit(&ring);
> + if (ret != 1) {
> + fprintf(stderr, "errcode=%d\n", -ret);
> + fprintf(stderr, "uring %s: io_uring_submit failed: %s\n",
> + rw == READ ? "read":"write", strerror(-ret));
> + goto uring_error;
> + }
> +
> + ret = io_uring_wait_cqe(&ring, &cqe);
> + if (ret < 0) {
> + if (ret == 0)
> + fprintf(stderr, "uring %s: no events available\n",
> + rw == READ ? "read":"write");
> + else {
> + fprintf(stderr, "errcode=%d\n", -ret);
> + fprintf(stderr, "uring %s: io_uring_wait_cqe failed: %s\n",
> + rw == READ ? "read":"write", strerror(-ret));
> + }
> + goto uring_error;
> + }
> + res = cqe->res;
> + io_uring_cqe_seen(&ring, cqe);
> +
> + res2 += res;
> + if (len != res2) {
> + if (res > 0) {
> + o += res;
> + l -= res;
> + p += res;
> + if (l > 0)
> + goto uring_loop;
> + } else if (res < 0) {
> + ret = res;
> + fprintf(stderr, "errcode=%d\n", -ret);
> + fprintf(stderr, "uring %s: io_uring failed: %s\n",
> + rw == READ ? "read":"write", strerror(-ret));
> + goto uring_error;
> + } else {
> + fprintf(stderr, "uring %s bad io length: %d instead of %u\n",
> + rw == READ ? "read":"write", res2, len);
> + }
> + }
> + return res2;
> +
> + uring_error:
> + /*
> + * The caller expects error return in traditional libc
> + * convention, i.e. -1 and the errno set to error.
> + */
> + errno = -ret;
> + return -1;
> +}
> +#endif
> +
> +int fsx_rw(int rw, int fd, char *buf, unsigned len, unsigned offset)
> +{
> + int ret = -1;
>
> if (aio) {
> +#ifdef AIO
> ret = __aio_rw(rw, fd, buf, len, offset);
> +#elif
> + fprintf(stderr, "io_rw: need AIO support!\n");
> + exit(111);
> +#endif
> + } else if (uring) {
> +#ifdef URING
> + ret = __uring_rw(rw, fd, buf, len, offset);
> +#elif
> + fprintf(stderr, "io_rw: need IO_URING support!\n");
> + exit(111);
> +#endif
> } else {
> if (rw == READ)
> ret = read(fd, buf, len);
> @@ -2441,8 +2557,6 @@ int aio_rw(int rw, int fd, char *buf, unsigned len, unsigned offset)
> return ret;
> }
>
> -#endif
> -
> #define test_fallocate(mode) __test_fallocate(mode, #mode)
>
> int
> @@ -2496,7 +2610,7 @@ main(int argc, char **argv)
> setvbuf(stdout, (char *)0, _IOLBF, 0); /* line buffered stdout */
>
> while ((ch = getopt_long(argc, argv,
> - "b:c:dfg:i:j:kl:m:no:p:qr:s:t:w:xyABD:EFJKHzCILN:OP:RS:WXZ",
> + "b:c:dfg:i:j:kl:m:no:p:qr:s:t:w:xyABD:EFJKHzCILN:OP:RS:UWXZ",
> longopts, NULL)) != EOF)
> switch (ch) {
> case 'b':
> @@ -2604,6 +2718,9 @@ main(int argc, char **argv)
> case 'A':
> aio = 1;
> break;
> + case 'U':
> + uring = 1;
> + break;
> case 'D':
> debugstart = getnum(optarg, &endp);
> if (debugstart < 1)
> @@ -2694,6 +2811,11 @@ main(int argc, char **argv)
> if (argc != 1)
> usage();
>
> + if (aio && uring) {
> + fprintf(stderr, "-A and -U shouldn't be used together\n");
> + usage();
> + }
> +
> if (integrity && !dirpath) {
> fprintf(stderr, "option -i <logdev> requires -P <dirpath>\n");
> usage();
> @@ -2784,6 +2906,10 @@ main(int argc, char **argv)
> if (aio)
> aio_setup();
> #endif
> +#ifdef URING
> + if (uring)
> + uring_setup();
> +#endif
>
> if (!(o_flags & O_TRUNC)) {
> off_t ret;
> --
> 2.20.1
>
