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fsstress: fallback to block size for min dio size

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XFS_IOC_DIOINFO is only used for XFS, but fsstress use it to get
DIO aligned size. If XFS_IOC_DIOINFO returns error, then stop
doing any DIO related test (dread/dwrite/aread/awrite etc). That
means we never do DIO related test on other filesystems by fsstress.

The real minimal dio size is really not so important for DIO test
in fsstress. The multiple of real min dio size is fine too. I think
the stat.st_blksize get from stat() system call can be used to be
a fake minimal dio size, if XFS_IOC_DIOINFO fails (not supported).

Note that the equation about d_maxiosz is copied from kernel
XFS_IOC_DIOINFO ioctl source code:

  case XFS_IOC_DIOINFO: {
    ...

    da.d_mem =  da.d_miniosz = target->bt_logical_sectorsize;
    da.d_maxiosz = INT_MAX & ~(da.d_miniosz - 1);

    ...
  }

[eguan: update commit log add d_maxiosz reference]

Signed-off-by: Zorro Lang <zlang@redhat.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
This commit is contained in:
Zorro Lang
2017-08-31 13:59:43 +08:00
committed by Eryu Guan
parent 41ab666990
commit b669b303d0
1 changed files with 11 additions and 12 deletions
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ltp/fsstress.c
+11 -12
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@@ -1901,11 +1901,11 @@ do_aio_rw(int opno, long r, int flags)
if (xfsctl(f.path, fd, XFS_IOC_DIOINFO, &diob) < 0) {
if (v)
printf(
"%d/%d: do_aio_rw - xfsctl(XFS_IOC_DIOINFO) %s%s failed %d\n",
"%d/%d: do_aio_rw - xfsctl(XFS_IOC_DIOINFO) %s%s return %d,"
" fallback to stat()\n",
procid, opno, f.path, st, errno);
free_pathname(&f);
close(fd);
return;
diob.d_mem = diob.d_miniosz = stb.st_blksize;
diob.d_maxiosz = INT_MAX & ~(diob.d_miniosz - 1);
}
dio_env = getenv("XFS_DIO_MIN");
if (dio_env)
@@ -2352,11 +2352,11 @@ dread_f(int opno, long r)
if (xfsctl(f.path, fd, XFS_IOC_DIOINFO, &diob) < 0) {
if (v)
printf(
"%d/%d: dread - xfsctl(XFS_IOC_DIOINFO) %s%s failed %d\n",
"%d/%d: dread - xfsctl(XFS_IOC_DIOINFO) %s%s return %d,"
" fallback to stat()\n",
procid, opno, f.path, st, errno);
free_pathname(&f);
close(fd);
return;
diob.d_mem = diob.d_miniosz = stb.st_blksize;
diob.d_maxiosz = INT_MAX & ~(diob.d_miniosz - 1);
}
dio_env = getenv("XFS_DIO_MIN");
@@ -2430,11 +2430,10 @@ dwrite_f(int opno, long r)
if (xfsctl(f.path, fd, XFS_IOC_DIOINFO, &diob) < 0) {
if (v)
printf("%d/%d: dwrite - xfsctl(XFS_IOC_DIOINFO)"
" %s%s failed %d\n",
" %s%s return %d, fallback to stat()\n",
procid, opno, f.path, st, errno);
free_pathname(&f);
close(fd);
return;
diob.d_mem = diob.d_miniosz = stb.st_blksize;
diob.d_maxiosz = INT_MAX & ~(diob.d_miniosz - 1);
}
dio_env = getenv("XFS_DIO_MIN");