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On 'buffer full' condition, double buffer size and repeat ioctl. [Untested]

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This commit is contained in:
Alasdair Kergon 2005-09-19 14:29:17 +00:00
parent 68366c99b2
commit 4e16b1e7ad
2 changed files with 64 additions and 35 deletions
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1
WHATS_NEW_DM
View File

@ -1,5 +1,6 @@
Version 1.01.05 -
=============================
On 'buffer full' condition, double buffer size and repeat ioctl.
Fix termination of getopt_long() option array.
Report 'buffer full' condition with v4 ioctl as well as with v1.

96
libdm/ioctl/libdm-iface.c
View File

@ -1026,7 +1026,7 @@ static void *_add_target(struct target *t, void *out, void *end)
return out;
}
static struct dm_ioctl *_flatten(struct dm_task *dmt)
static struct dm_ioctl *_flatten(struct dm_task *dmt, unsigned repeat_count)
{
const size_t min_size = 16 * 1024;
const int (*version)[3];
@ -1077,6 +1077,10 @@ static struct dm_ioctl *_flatten(struct dm_task *dmt)
if (len < min_size)
len = min_size;
/* Increase buffer size if repeating because buffer was too small */
while (repeat_count--)
len *= 2;
if (!(dmi = malloc(len)))
return NULL;
@ -1276,40 +1280,14 @@ static int _create_and_load_v4(struct dm_task *dmt)
return r;
}
int dm_task_run(struct dm_task *dmt)
static struct dm_ioctl *_do_dm_ioctl(struct dm_task *dmt, unsigned repeat_count)
{
struct dm_ioctl *dmi = NULL;
unsigned int command;
struct dm_ioctl *dmi;
#ifdef DM_COMPAT
if (_dm_version == 1)
return _dm_task_run_v1(dmt);
#endif
if ((unsigned) dmt->type >=
(sizeof(_cmd_data_v4) / sizeof(*_cmd_data_v4))) {
log_error("Internal error: unknown device-mapper task %d",
dmt->type);
goto bad;
}
command = _cmd_data_v4[dmt->type].cmd;
/* Old-style creation had a table supplied */
if (dmt->type == DM_DEVICE_CREATE && dmt->head)
return _create_and_load_v4(dmt);
if (dmt->type == DM_DEVICE_MKNODES && !dmt->dev_name &&
!dmt->uuid && dmt->major <= 0)
return _mknodes_v4(dmt);
if (!_open_control())
return 0;
dmi = _flatten(dmt);
dmi = _flatten(dmt, repeat_count);
if (!dmi) {
log_error("Couldn't create ioctl argument");
return 0;
return NULL;
}
if (dmt->type == DM_DEVICE_TABLE)
@ -1338,15 +1316,65 @@ int dm_task_run(struct dm_task *dmt)
log_error("device-mapper ioctl "
"cmd %d failed: %s",
_IOC_NR(command), strerror(errno));
goto bad;
free(dmi);
return NULL;
}
}
#else /* Userspace alternative for testing */
#endif
return dmi;
}
if (dmi->flags & DM_BUFFER_FULL_FLAG)
/* FIXME Increase buffer size and retry operation (if query) */
int dm_task_run(struct dm_task *dmt)
{
struct dm_ioctl *dmi;
unsigned command;
unsigned repeat_count = 0;
#ifdef DM_COMPAT
if (_dm_version == 1)
return _dm_task_run_v1(dmt);
#endif
if ((unsigned) dmt->type >=
(sizeof(_cmd_data_v4) / sizeof(*_cmd_data_v4))) {
log_error("Internal error: unknown device-mapper task %d",
dmt->type);
return 0;
}
command = _cmd_data_v4[dmt->type].cmd;
/* Old-style creation had a table supplied */
if (dmt->type == DM_DEVICE_CREATE && dmt->head)
return _create_and_load_v4(dmt);
if (dmt->type == DM_DEVICE_MKNODES && !dmt->dev_name &&
!dmt->uuid && dmt->major <= 0)
return _mknodes_v4(dmt);
if (!_open_control())
return 0;
repeat_ioctl:
if (!(dmi = _do_dm_ioctl(dmt, repeat_count)))
return 0;
if (dmi->flags & DM_BUFFER_FULL_FLAG) {
switch (dmt->type) {
case DM_DEVICE_LIST_VERSIONS:
case DM_DEVICE_LIST:
case DM_DEVICE_DEPS:
case DM_DEVICE_STATUS:
case DM_DEVICE_TABLE:
case DM_DEVICE_WAITEVENT:
repeat_count++;
free(dmi);
goto repeat_ioctl;
default:
log_error("Warning: libdevmapper buffer too small for data");
}
}
switch (dmt->type) {
case DM_DEVICE_CREATE: