On Tue, Feb 28, 2023 at 06:59:43PM -0800, Darrick J. Wong wrote:
> From: Darrick J. Wong <djwong@xxxxxxxxxx>
>
> Teach this stress tool to be able to use the file content exchange
> ioctl.
>
> Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
> ---
> ltp/fsstress.c | 168 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 168 insertions(+)
>
>
> diff --git a/ltp/fsstress.c b/ltp/fsstress.c
> index 10608fb554..0fba3d92a0 100644
> --- a/ltp/fsstress.c
> +++ b/ltp/fsstress.c
> @@ -143,6 +143,7 @@ typedef enum {
> OP_URING_WRITE,
> OP_WRITE,
> OP_WRITEV,
> + OP_XCHGRANGE,
> OP_LAST
> } opty_t;
>
> @@ -272,6 +273,8 @@ void uring_read_f(opnum_t, long);
> void uring_write_f(opnum_t, long);
> void write_f(opnum_t, long);
> void writev_f(opnum_t, long);
> +void xchgrange_f(opnum_t, long);
> +
> char *xattr_flag_to_string(int);
>
> struct opdesc ops[OP_LAST] = {
> @@ -340,6 +343,7 @@ struct opdesc ops[OP_LAST] = {
> [OP_URING_WRITE] = {"uring_write", uring_write_f, 1, 1 },
> [OP_WRITE] = {"write", write_f, 4, 1 },
> [OP_WRITEV] = {"writev", writev_f, 4, 1 },
> + [OP_XCHGRANGE] = {"xchgrange", xchgrange_f, 4, 1 },
Do you think this is a common operation which should use same frequency (4)
with read/write operations? I'd like to reduce the default freq=4 to 2 or 1
when I merge it. what do you think?
Thanks,
Zorro
> }, *ops_end;
>
> flist_t flist[FT_nft] = {
> @@ -2494,6 +2498,170 @@ chown_f(opnum_t opno, long r)
> free_pathname(&f);
> }
>
> +/* exchange some arbitrary range of f1 to f2...fn. */
> +void
> +xchgrange_f(
> + opnum_t opno,
> + long r)
> +{
> +#ifdef FIEXCHANGE_RANGE
> + struct file_xchg_range fxr = { 0 };
> + static __u64 swap_flags = 0;
> + struct pathname fpath1;
> + struct pathname fpath2;
> + struct stat64 stat1;
> + struct stat64 stat2;
> + char inoinfo1[1024];
> + char inoinfo2[1024];
> + off64_t lr;
> + off64_t off1;
> + off64_t off2;
> + off64_t max_off2;
> + size_t len;
> + int v1;
> + int v2;
> + int fd1;
> + int fd2;
> + int ret;
> + int tries = 0;
> + int e;
> +
> + /* Load paths */
> + init_pathname(&fpath1);
> + if (!get_fname(FT_REGm, r, &fpath1, NULL, NULL, &v1)) {
> + if (v1)
> + printf("%d/%lld: xchgrange read - no filename\n",
> + procid, opno);
> + goto out_fpath1;
> + }
> +
> + init_pathname(&fpath2);
> + if (!get_fname(FT_REGm, random(), &fpath2, NULL, NULL, &v2)) {
> + if (v2)
> + printf("%d/%lld: xchgrange write - no filename\n",
> + procid, opno);
> + goto out_fpath2;
> + }
> +
> + /* Open files */
> + fd1 = open_path(&fpath1, O_RDONLY);
> + e = fd1 < 0 ? errno : 0;
> + check_cwd();
> + if (fd1 < 0) {
> + if (v1)
> + printf("%d/%lld: xchgrange read - open %s failed %d\n",
> + procid, opno, fpath1.path, e);
> + goto out_fpath2;
> + }
> +
> + fd2 = open_path(&fpath2, O_WRONLY);
> + e = fd2 < 0 ? errno : 0;
> + check_cwd();
> + if (fd2 < 0) {
> + if (v2)
> + printf("%d/%lld: xchgrange write - open %s failed %d\n",
> + procid, opno, fpath2.path, e);
> + goto out_fd1;
> + }
> +
> + /* Get file stats */
> + if (fstat64(fd1, &stat1) < 0) {
> + if (v1)
> + printf("%d/%lld: xchgrange read - fstat64 %s failed %d\n",
> + procid, opno, fpath1.path, errno);
> + goto out_fd2;
> + }
> + inode_info(inoinfo1, sizeof(inoinfo1), &stat1, v1);
> +
> + if (fstat64(fd2, &stat2) < 0) {
> + if (v2)
> + printf("%d/%lld: xchgrange write - fstat64 %s failed %d\n",
> + procid, opno, fpath2.path, errno);
> + goto out_fd2;
> + }
> + inode_info(inoinfo2, sizeof(inoinfo2), &stat2, v2);
> +
> + if (stat1.st_size < (stat1.st_blksize * 2) ||
> + stat2.st_size < (stat2.st_blksize * 2)) {
> + if (v2)
> + printf("%d/%lld: xchgrange - files are too small\n",
> + procid, opno);
> + goto out_fd2;
> + }
> +
> + /* Never let us swap more than 1/4 of the files. */
> + len = (random() % FILELEN_MAX) + 1;
> + if (len > stat1.st_size / 4)
> + len = stat1.st_size / 4;
> + if (len > stat2.st_size / 4)
> + len = stat2.st_size / 4;
> + len = rounddown_64(len, stat1.st_blksize);
> + if (len == 0)
> + len = stat1.st_blksize;
> +
> + /* Calculate offsets */
> + lr = ((int64_t)random() << 32) + random();
> + if (stat1.st_size == len)
> + off1 = 0;
> + else
> + off1 = (off64_t)(lr % MIN(stat1.st_size - len, MAXFSIZE));
> + off1 %= maxfsize;
> + off1 = rounddown_64(off1, stat1.st_blksize);
> +
> + /*
> + * If srcfile == destfile, randomly generate destination ranges
> + * until we find one that doesn't overlap the source range.
> + */
> + max_off2 = MIN(stat2.st_size - len, MAXFSIZE);
> + do {
> + lr = ((int64_t)random() << 32) + random();
> + if (stat2.st_size == len)
> + off2 = 0;
> + else
> + off2 = (off64_t)(lr % max_off2);
> + off2 %= maxfsize;
> + off2 = rounddown_64(off2, stat2.st_blksize);
> + } while (stat1.st_ino == stat2.st_ino &&
> + llabs(off2 - off1) < len &&
> + tries++ < 10);
> +
> + /* Swap data blocks */
> + fxr.file1_fd = fd1;
> + fxr.file1_offset = off1;
> + fxr.length = len;
> + fxr.file2_offset = off2;
> + fxr.flags = swap_flags;
> +
> +retry:
> + ret = ioctl(fd2, FIEXCHANGE_RANGE, &fxr);
> + e = ret < 0 ? errno : 0;
> + if (e == EOPNOTSUPP && !(swap_flags & FILE_XCHG_RANGE_NONATOMIC)) {
> + swap_flags = FILE_XCHG_RANGE_NONATOMIC;
> + fxr.flags |= swap_flags;
> + goto retry;
> + }
> + if (v1 || v2) {
> + printf("%d/%lld: xchgrange %s%s [%lld,%lld] -> %s%s [%lld,%lld]",
> + procid, opno,
> + fpath1.path, inoinfo1, (long long)off1, (long long)len,
> + fpath2.path, inoinfo2, (long long)off2, (long long)len);
> +
> + if (ret < 0)
> + printf(" error %d", e);
> + printf("\n");
> + }
> +
> +out_fd2:
> + close(fd2);
> +out_fd1:
> + close(fd1);
> +out_fpath2:
> + free_pathname(&fpath2);
> +out_fpath1:
> + free_pathname(&fpath1);
> +#endif
> +}
> +
> /* reflink some arbitrary range of f1 to f2. */
> void
> clonerange_f(
>
