/*
* Note: this function is only used for testing, it is no safe for production
* use.
*/
static int
lprocfs_fid_write_common(const char *buffer, unsigned long count,
struct lu_seq_range *range)
{
struct lu_seq_range tmp;
int rc;
LASSERT(range != NULL);
rc = sscanf(buffer, "[%llx - %llx]\n",
(long long unsigned *)&tmp.lsr_start,
(long long unsigned *)&tmp.lsr_end);
if (rc != 2 || !range_is_sane(&tmp) || range_is_zero(&tmp))
return -EINVAL;
*range = tmp;
return 0;
}
/*
* This function implements new seq allocation algorithm using async
* updates to seq file on disk. ref bug 18857 for details.
* there are four variable to keep track of this process
*
* lss_space; - available lss_space
* lss_lowater_set; - lu_seq_range for all seqs before barrier, i.e. safe to use
* lss_hiwater_set; - lu_seq_range after barrier, i.e. allocated but may be
* not yet committed
*
* when lss_lowater_set reaches the end it is replaced with hiwater one and
* a write operation is initiated to allocate new hiwater range.
* if last seq write opearion is still not commited, current operation is
* flaged as sync write op.
*/
static int range_alloc_set(const struct lu_env *env,
struct lu_seq_range *out,
struct lu_server_seq *seq)
{
struct lu_seq_range *space = &seq->lss_space;
struct lu_seq_range *loset = &seq->lss_lowater_set;
struct lu_seq_range *hiset = &seq->lss_hiwater_set;
int rc = 0;
if (range_is_zero(loset))
__seq_set_init(env, seq);
if (OBD_FAIL_CHECK(OBD_FAIL_SEQ_ALLOC)) /* exhaust set */
loset->lsr_start = loset->lsr_end;
if (range_is_exhausted(loset)) {
/* reached high water mark. */
struct lu_device *dev = seq->lss_site->ss_lu->ls_top_dev;
int obd_num_clients = dev->ld_obd->obd_num_exports;
__u64 set_sz;
/* calculate new seq width based on number of clients */
set_sz = max(seq->lss_set_width,
obd_num_clients * seq->lss_width);
set_sz = min(range_space(space), set_sz);
/* Switch to hiwater range now */
*loset = *hiset;
/* allocate new hiwater range */
range_alloc(hiset, space, set_sz);
/* update ondisk seq with new *space */
rc = seq_store_update(env, seq, NULL, seq->lss_need_sync);
}
LASSERTF(!range_is_exhausted(loset) || range_is_sane(loset),
DRANGE"\n", PRANGE(loset));
if (rc == 0)
range_alloc(out, loset, seq->lss_width);
RETURN(rc);
}
/*
* Note: this function is only used for testing, it is no safe for production
* use.
*/
static int
seq_proc_write_common(struct file *file, const char *buffer,
unsigned long count, void *data,
struct lu_seq_range *range)
{
struct lu_seq_range tmp;
int rc;
ENTRY;
LASSERT(range != NULL);
rc = sscanf(buffer, "[%llx - %llx]\n",
(long long unsigned *)&tmp.lsr_start,
(long long unsigned *)&tmp.lsr_end);
if (rc != 2 || !range_is_sane(&tmp) || range_is_zero(&tmp))
RETURN(-EINVAL);
*range = tmp;
RETURN(0);
}
int seq_server_init(struct lu_server_seq *seq,
struct dt_device *dev,
const char *prefix,
enum lu_mgr_type type,
struct seq_server_site *ss,
const struct lu_env *env)
{
int rc, is_srv = (type == LUSTRE_SEQ_SERVER);
ENTRY;
LASSERT(dev != NULL);
LASSERT(prefix != NULL);
LASSERT(ss != NULL);
LASSERT(ss->ss_lu != NULL);
seq->lss_cli = NULL;
seq->lss_type = type;
seq->lss_site = ss;
range_init(&seq->lss_space);
range_init(&seq->lss_lowater_set);
range_init(&seq->lss_hiwater_set);
seq->lss_set_width = LUSTRE_SEQ_BATCH_WIDTH;
mutex_init(&seq->lss_mutex);
seq->lss_width = is_srv ?
LUSTRE_SEQ_META_WIDTH : LUSTRE_SEQ_SUPER_WIDTH;
snprintf(seq->lss_name, sizeof(seq->lss_name),
"%s-%s", (is_srv ? "srv" : "ctl"), prefix);
rc = seq_store_init(seq, env, dev);
if (rc)
GOTO(out, rc);
/* Request backing store for saved sequence info. */
rc = seq_store_read(seq, env);
if (rc == -ENODATA) {
/* Nothing is read, init by default value. */
seq->lss_space = is_srv ?
LUSTRE_SEQ_ZERO_RANGE:
LUSTRE_SEQ_SPACE_RANGE;
LASSERT(ss != NULL);
seq->lss_space.lsr_index = ss->ss_node_id;
LCONSOLE_INFO("%s: No data found "
"on store. Initialize space\n",
seq->lss_name);
rc = seq_store_update(env, seq, NULL, 0);
if (rc) {
CERROR("%s: Can't write space data, "
"rc %d\n", seq->lss_name, rc);
}
} else if (rc) {
CERROR("%s: Can't read space data, rc %d\n",
seq->lss_name, rc);
GOTO(out, rc);
}
if (is_srv) {
LASSERT(range_is_sane(&seq->lss_space));
} else {
LASSERT(!range_is_zero(&seq->lss_space) &&
range_is_sane(&seq->lss_space));
}
rc = seq_server_proc_init(seq);
if (rc)
GOTO(out, rc);
EXIT;
out:
if (rc)
seq_server_fini(seq, env);
return rc;
}
