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test_diskread(): detect end of the disk

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Detect the end of the disk condition. This may happpen when
disk image is truncated and the reads are addressing blocks past
image end.

MFC after:		1 week
Differential Revision:	https://reviews.freebsd.org/D35432
This commit is contained in:
Toomas Soome 2022-06-01 10:28:43 +03:00
parent a2e02d9d8e
commit 942e52f776
1 changed files with 5 additions and 0 deletions
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5
stand/userboot/test/test.c
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@ -254,6 +254,11 @@ test_diskread(void *arg, int unit, uint64_t offset, void *dst, size_t size,
if (unit > disk_index || disk_fd[unit] == -1)
return (EIO);
n = pread(disk_fd[unit], dst, size, offset);
if (n == 0) {
printf("%s: end of disk (%ju)\n", __func__, (intmax_t)offset);
return (EIO);
}
if (n < 0)
return (errno);
*resid_return = size - n;