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- scst_user docs updated

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- Added notification about device change in fileio_tgt



git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@700 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
2009-03-17 18:07:36 +00:00
parent 159ef466dc
commit a1acc1bc78
3 changed files with 54 additions and 3 deletions
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14
doc/scst_user_spec.txt
View File

@@ -829,6 +829,20 @@ SCST_USER_FLUSH_CACHE returns 0 on success or -1 in case of error,
and errno is set appropriately.
7. SCST_USER_DEVICE_CAPACITY_CHANGED
SCST_USER_DEVICE_CAPACITY_CHANGED - queues CAPACITY DATA HAS CHANGED
Unit Attention or corresponding Asynchronous Event to the corresponding
virtual device. It will notify remote initiators, connected to the
device, and allow them to automatically refresh new device size. You
should use SCST_USER_DEVICE_CAPACITY_CHANGED after resize of the device.
SCST_USER_DEVICE_CAPACITY_CHANGED doesn't have any parameters.
SCST_USER_DEVICE_CAPACITY_CHANGED returns 0 on success or -1 in case of
error, and errno is set appropriately.
IV. Commands processing flow example.
As the example consider a simple synchronous VTL, which serves one

6
usr/fileio/common.c
View File

@@ -125,14 +125,18 @@ static inline void set_cmd_error_status(struct scst_user_scsi_cmd_reply_exec *re
static int set_sense(uint8_t *buffer, int len, int key, int asc, int ascq)
{
int res = 14;
int res = SCST_STANDARD_SENSE_LEN;
EXTRACHECKS_BUG_ON(len < res);
memset(buffer, 0, res);
buffer[0] = 0x70; /* Error Code */
buffer[2] = key; /* Sense Key */
buffer[7] = 0x0a; /* Additional Sense Length */
buffer[12] = asc; /* ASC */
buffer[13] = ascq; /* ASCQ */
TRACE_BUFFER("Sense set", buffer, res);
return res;
}

37
usr/fileio/fileio.c
View File

@@ -189,6 +189,28 @@ out:
return;
}
void sigusr1_handler(int signo)
{
int res;
TRACE_ENTRY();
TRACE_MGMT_DBG("%s", "Capacity data changed...");
res = ioctl(dev.scst_usr_fd, SCST_USER_DEVICE_CAPACITY_CHANGED, NULL);
if (res != 0) {
res = errno;
PRINT_ERROR("Capacity data changed failed: %s", strerror(res));
goto out;
}
TRACE_DBG("%s", "Capacity data changed done.");
out:
TRACE_EXIT();
return;
}
int main(int argc, char **argv)
{
int res = 0;
@@ -480,6 +502,19 @@ int main(int argc, char **argv)
pthread_t thread[threads];
int i, j, rc;
void *rc1;
struct sigaction act;
memset(&act, 0, sizeof(act));
act.sa_handler = sigusr1_handler;
act.sa_flags = SA_RESTART;
sigemptyset(&act.sa_mask);
res = sigaction(SIGUSR1, &act, NULL);
if (res != 0) {
res = errno;
PRINT_ERROR("sigaction() failed: %s",
strerror(res));
/* don't do anything */
}
for(i = 0; i < threads; i++) {
rc = pthread_create(&thread[i], NULL, main_loop, &dev);
@@ -492,8 +527,6 @@ int main(int argc, char **argv)
}
if (flush_interval != 0) {
struct sigaction act;
memset(&act, 0, sizeof(act));
act.sa_handler = sigalrm_handler;
act.sa_flags = SA_RESTART;