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Try to read first sector from device to properly check that device is ready.

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git-svn-id: https://cryptsetup.googlecode.com/svn/trunk@106 36d66b0a-2a48-0410-832c-cd162a569da5
This commit is contained in:
Milan Broz
2009-09-08 10:29:50 +00:00
parent a47856ac49
commit dfadce6d80
4 changed files with 23 additions and 13 deletions
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21
lib/utils.c
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@@ -505,27 +505,36 @@ out_err:
int device_ready(struct crypt_device *cd, const char *device, int mode)
{
int devfd;
int devfd, r = 1;
ssize_t s;
struct stat st;
char buf[512];
if(stat(device, &st) < 0) {
log_err(cd, _("Device %s doesn't exist or access denied.\n"), device);
return 0;
}
if (!mode)
return 1;
log_dbg("Trying to open and read device %s.", device);
devfd = open(device, mode | O_DIRECT | O_SYNC);
if(devfd < 0) {
log_err(cd, _("Can't open device %s for %s%s access.\n"), device,
log_err(cd, _("Cannot open device %s for %s%s access.\n"), device,
(mode & O_EXCL) ? _("exclusive ") : "",
(mode & O_RDWR) ? _("writable") : _("read-only"));
return 0;
}
/* Try to read first sector */
s = read_blockwise(devfd, buf, sizeof(buf));
if (s < 0 || s != sizeof(buf)) {
log_err(cd, _("Cannot read device %s.\n"), device);
r = 0;
}
memset(buf, 0, sizeof(buf));
close(devfd);
return 1;
return r;
}
int get_device_infos(const char *device, struct device_infos *infos, struct crypt_device *cd)