/*----------------------------------------------------------------
* disk log constructor/destructor
*
* argv contains log_device region_size followed optionally by [no]sync
*--------------------------------------------------------------*/
static int disk_ctr(struct dirty_log *log, struct dm_target *ti,
unsigned int argc, char **argv)
{
int r;
size_t size;
struct log_c *lc;
struct dm_dev *dev;
if (argc < 2 || argc > 3) {
DMWARN("wrong number of arguments to disk mirror log");
return -EINVAL;
}
r = dm_get_device(ti, argv[0], 0, 0 /* FIXME */,
FMODE_READ | FMODE_WRITE, &dev);
if (r)
return r;
r = core_ctr(log, ti, argc - 1, argv + 1);
if (r) {
dm_put_device(ti, dev);
return r;
}
lc = (struct log_c *) log->context;
lc->log_dev = dev;
/* setup the disk header fields */
lc->header_location.bdev = lc->log_dev->bdev;
lc->header_location.sector = 0;
lc->header_location.count = 1;
/*
* We can't read less than this amount, even though we'll
* not be using most of this space.
*/
lc->disk_header = vmalloc(1 << SECTOR_SHIFT);
if (!lc->disk_header)
goto bad;
/* setup the disk bitset fields */
lc->bits_location.bdev = lc->log_dev->bdev;
lc->bits_location.sector = LOG_OFFSET;
size = dm_round_up(lc->bitset_uint32_count * sizeof(uint32_t),
1 << SECTOR_SHIFT);
lc->bits_location.count = size >> SECTOR_SHIFT;
lc->disk_bits = vmalloc(size);
if (!lc->disk_bits) {
vfree(lc->disk_header);
goto bad;
}
return 0;
bad:
dm_put_device(ti, lc->log_dev);
core_dtr(log);
return -ENOMEM;
}
/*
* Parse a single <dev> <sector> pair
*/
static int get_vm(struct dm_target *ti, struct vm_c *vc,
unsigned int vm, char **argv)
{
unsigned long long start;
char dummy;
if (sscanf(argv[1], "%llu%c", &start, &dummy) != 1)
return -EINVAL;
if (dm_get_device(ti, argv[0], dm_table_get_mode(ti->table),
&vc->vm[vm].dev))
return -ENXIO;
vc->vm[vm].physical_start = start;
return 0;
}
/*----------------------------------------------------------------
* disk log constructor/destructor
*
* argv contains log_device region_size followed optionally by [no]sync
*--------------------------------------------------------------*/
static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti,
unsigned int argc, char **argv)
{
int r;
struct dm_dev *dev;
if (argc < 2 || argc > 3) {
DMWARN("wrong number of arguments to disk dirty region log");
return -EINVAL;
}
r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &dev);
if (r)
return r;
r = create_log_context(log, ti, argc - 1, argv + 1, dev);
if (r) {
dm_put_device(ti, dev);
return r;
}
return 0;
}
/*----------------------------------------------------------------
* disk log constructor/destructor
*
* argv contains log_device region_size followed optionally by [no]sync
*--------------------------------------------------------------*/
static int disk_ctr(struct dirty_log *log, struct dm_target *ti,
unsigned int argc, char **argv)
{
int r;
struct dm_dev *dev;
if (argc < 2 || argc > 3) {
DMWARN("wrong number of arguments to disk mirror log");
return -EINVAL;
}
r = dm_get_device(ti, argv[0], 0, 0 /* FIXME */,
FMODE_READ | FMODE_WRITE, &dev);
if (r)
return r;
r = create_log_context(log, ti, argc - 1, argv + 1, dev);
if (r) {
dm_put_device(ti, dev);
return r;
}
return 0;
}
/*
* userspace_ctr
*
* argv contains:
* <UUID> [integrated_flush] <other args>
* Where 'other args' are the userspace implementation-specific log
* arguments.
*
* Example:
* <UUID> [integrated_flush] clustered-disk <arg count> <log dev>
* <region_size> [[no]sync]
*
* This module strips off the <UUID> and uses it for identification
* purposes when communicating with userspace about a log.
*
* If integrated_flush is defined, the kernel combines flush
* and mark requests.
*
* The rest of the line, beginning with 'clustered-disk', is passed
* to the userspace ctr function.
*/
static int userspace_ctr(struct dm_dirty_log *log, struct dm_target *ti,
unsigned argc, char **argv)
{
int r = 0;
int str_size;
char *ctr_str = NULL;
struct log_c *lc = NULL;
uint64_t rdata;
size_t rdata_size = sizeof(rdata);
char *devices_rdata = NULL;
size_t devices_rdata_size = DM_NAME_LEN;
if (argc < 3) {
DMWARN("Too few arguments to userspace dirty log");
return -EINVAL;
}
lc = kzalloc(sizeof(*lc), GFP_KERNEL);
if (!lc) {
DMWARN("Unable to allocate userspace log context.");
return -ENOMEM;
}
/* The ptr value is sufficient for local unique id */
lc->luid = (unsigned long)lc;
lc->ti = ti;
if (strlen(argv[0]) > (DM_UUID_LEN - 1)) {
DMWARN("UUID argument too long.");
kfree(lc);
return -EINVAL;
}
lc->usr_argc = argc;
strncpy(lc->uuid, argv[0], DM_UUID_LEN);
argc--;
argv++;
spin_lock_init(&lc->flush_lock);
INIT_LIST_HEAD(&lc->mark_list);
INIT_LIST_HEAD(&lc->clear_list);
if (!strcasecmp(argv[0], "integrated_flush")) {
lc->integrated_flush = 1;
argc--;
argv++;
}
str_size = build_constructor_string(ti, argc, argv, &ctr_str);
if (str_size < 0) {
kfree(lc);
return str_size;
}
devices_rdata = kzalloc(devices_rdata_size, GFP_KERNEL);
if (!devices_rdata) {
DMERR("Failed to allocate memory for device information");
r = -ENOMEM;
goto out;
}
lc->flush_entry_pool = mempool_create_slab_pool(FLUSH_ENTRY_POOL_SIZE,
_flush_entry_cache);
if (!lc->flush_entry_pool) {
DMERR("Failed to create flush_entry_pool");
r = -ENOMEM;
goto out;
}
/*
* Send table string and get back any opened device.
*/
r = dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_CTR,
ctr_str, str_size,
devices_rdata, &devices_rdata_size);
if (r < 0) {
if (r == -ESRCH)
DMERR("Userspace log server not found");
else
DMERR("Userspace log server failed to create log");
goto out;
}
/* Since the region size does not change, get it now */
rdata_size = sizeof(rdata);
r = dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_GET_REGION_SIZE,
NULL, 0, (char *)&rdata, &rdata_size);
if (r) {
DMERR("Failed to get region size of dirty log");
goto out;
}
lc->region_size = (uint32_t)rdata;
lc->region_count = dm_sector_div_up(ti->len, lc->region_size);
if (devices_rdata_size) {
if (devices_rdata[devices_rdata_size - 1] != '\0') {
DMERR("DM_ULOG_CTR device return string not properly terminated");
r = -EINVAL;
goto out;
}
r = dm_get_device(ti, devices_rdata,
dm_table_get_mode(ti->table), &lc->log_dev);
if (r)
DMERR("Failed to register %s with device-mapper",
devices_rdata);
}
if (lc->integrated_flush) {
lc->dmlog_wq = alloc_workqueue("dmlogd", WQ_MEM_RECLAIM, 0);
if (!lc->dmlog_wq) {
DMERR("couldn't start dmlogd");
r = -ENOMEM;
goto out;
}
INIT_DELAYED_WORK(&lc->flush_log_work, do_flush);
atomic_set(&lc->sched_flush, 0);
}
out:
kfree(devices_rdata);
if (r) {
if (lc->flush_entry_pool)
mempool_destroy(lc->flush_entry_pool);
kfree(lc);
kfree(ctr_str);
} else {
lc->usr_argv_str = ctr_str;
log->context = lc;
}
return r;
}
/*----------------------------------------------------------------
* disk log constructor/destructor
*
* argv contains 2 - 4 arguments:
* <log_device> <region_size> [[no]sync] [block_on_error]
*--------------------------------------------------------------*/
static int disk_ctr(struct dirty_log *log, struct dm_target *ti,
unsigned int argc, char **argv)
{
int r;
size_t size, bitset_size;
struct log_c *lc;
struct dm_dev *dev;
uint32_t *clean_bits;
if (argc < 2 || argc > 4) {
DMWARN("wrong number of arguments to disk mirror log");
return -EINVAL;
}
r = dm_get_device(ti, argv[0], 0, 0 /* FIXME */,
FMODE_READ | FMODE_WRITE, &dev);
if (r)
return r;
r = core_ctr(log, ti, argc - 1, argv + 1);
if (r) {
dm_put_device(ti, dev);
return r;
}
lc = (struct log_c *) log->context;
lc->log_dev = dev;
lc->log_dev_failed = 0;
/* setup the disk header fields */
lc->header_location.bdev = lc->log_dev->bdev;
lc->header_location.sector = 0;
/* Include both the header and the bitset in one buffer. */
bitset_size = lc->bitset_uint32_count * sizeof(uint32_t);
size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size,
ti->limits.hardsect_size);
if (size > dev->bdev->bd_inode->i_size) {
DMWARN("log device %s too small: need %llu bytes",
dev->name, (unsigned long long)size);
r = -EINVAL;
goto bad;
}
lc->header_location.count = size >> SECTOR_SHIFT;
lc->disk_header = vmalloc(size);
if (!lc->disk_header) {
r = -ENOMEM;
goto bad;
}
/*
* Deallocate the clean_bits buffer that was allocated in core_ctr()
* and point it at the appropriate place in the disk_header buffer.
*/
clean_bits = lc->clean_bits;
lc->clean_bits = (void *)lc->disk_header + (LOG_OFFSET << SECTOR_SHIFT);
memcpy(lc->clean_bits, clean_bits, bitset_size);
vfree(clean_bits);
lc->io_req.mem.type = DM_IO_VMA;
lc->io_req.client = dm_io_client_create(dm_div_up(size, PAGE_SIZE));
if (IS_ERR(lc->io_req.client)) {
r = PTR_ERR(lc->io_req.client);
DMWARN("couldn't allocate disk io client");
vfree(lc->disk_header);
goto bad;
}
return 0;
bad:
dm_put_device(ti, lc->log_dev);
core_dtr(log);
return r;
}
