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kerndat: Produce sane error messgaes

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I've just occasionally tried to run criu on old openvz
kernel and the error message was looking somehow strange
to me

| Error (kerndat.c:39): Can't stat piggie: No such file or directory

Lets produce some more detailed error text.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Cyrill Gorcunov
2013-08-09 15:37:35 +04:00
committed by Pavel Emelyanov
parent 53aae95796
commit 9556ffb112
1 changed files with 4 additions and 4 deletions
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8
kerndat.c
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@@ -28,7 +28,7 @@ static int kerndat_get_shmemdev(void)
map = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, 0, 0);
if (map == MAP_FAILED) {
pr_perror("Can't mmap piggie");
pr_perror("Can't mmap memory for shmemdev test");
return -1;
}
@@ -36,14 +36,14 @@ static int kerndat_get_shmemdev(void)
(unsigned long)map, (unsigned long)map + PAGE_SIZE);
if (stat(maps, &buf) < 0) {
munmap(map, PAGE_SIZE);
pr_perror("Can't stat piggie");
pr_perror("Can't stat self map_files");
return -1;
}
munmap(map, PAGE_SIZE);
kerndat_shmem_dev = buf.st_dev;
pr_info("Found anon-shmem piggie at %"PRIx64"\n", kerndat_shmem_dev);
pr_info("Found anon-shmem device at %"PRIx64"\n", kerndat_shmem_dev);
return 0;
}
@@ -64,7 +64,7 @@ int kerndat_get_dirty_track(void)
map = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
if (map == MAP_FAILED) {
pr_perror("Can't mmap piggie2");
pr_perror("Can't mmap memory for pagemap test");
return ret;
}