/* Allocate new fid on passed client @seq and save it to @fid. */
int seq_client_alloc_fid(const struct lu_env *env,
struct lu_client_seq *seq, struct lu_fid *fid)
{
cfs_waitlink_t link;
int rc;
ENTRY;
LASSERT(seq != NULL);
LASSERT(fid != NULL);
cfs_waitlink_init(&link);
cfs_mutex_lock(&seq->lcs_mutex);
while (1) {
seqno_t seqnr;
if (!fid_is_zero(&seq->lcs_fid) &&
fid_oid(&seq->lcs_fid) < seq->lcs_width) {
/* Just bump last allocated fid and return to caller. */
seq->lcs_fid.f_oid += 1;
rc = 0;
break;
}
rc = seq_fid_alloc_prep(seq, &link);
if (rc)
continue;
rc = seq_client_alloc_seq(env, seq, &seqnr);
if (rc) {
CERROR("%s: Can't allocate new sequence, "
"rc %d\n", seq->lcs_name, rc);
seq_fid_alloc_fini(seq);
cfs_mutex_unlock(&seq->lcs_mutex);
RETURN(rc);
}
CDEBUG(D_INFO, "%s: Switch to sequence "
"[0x%16.16"LPF64"x]\n", seq->lcs_name, seqnr);
seq->lcs_fid.f_oid = LUSTRE_FID_INIT_OID;
seq->lcs_fid.f_seq = seqnr;
seq->lcs_fid.f_ver = 0;
/*
* Inform caller that sequence switch is performed to allow it
* to setup FLD for it.
*/
rc = 1;
seq_fid_alloc_fini(seq);
break;
}
*fid = seq->lcs_fid;
cfs_mutex_unlock(&seq->lcs_mutex);
CDEBUG(D_INFO, "%s: Allocated FID "DFID"\n", seq->lcs_name, PFID(fid));
RETURN(rc);
}
/**
* Allocate the whole seq to the caller.
**/
int seq_client_get_seq(const struct lu_env *env,
struct lu_client_seq *seq, u64 *seqnr)
{
wait_queue_t link;
int rc;
LASSERT(seqnr != NULL);
mutex_lock(&seq->lcs_mutex);
init_waitqueue_entry_current(&link);
while (1) {
rc = seq_fid_alloc_prep(seq, &link);
if (rc == 0)
break;
}
rc = seq_client_alloc_seq(env, seq, seqnr);
if (rc) {
CERROR("%s: Can't allocate new sequence, "
"rc %d\n", seq->lcs_name, rc);
seq_fid_alloc_fini(seq);
mutex_unlock(&seq->lcs_mutex);
return rc;
}
CDEBUG(D_INFO, "%s: allocate sequence "
"[0x%16.16"LPF64"x]\n", seq->lcs_name, *seqnr);
/* Since the caller require the whole seq,
* so marked this seq to be used */
if (seq->lcs_type == LUSTRE_SEQ_METADATA)
seq->lcs_fid.f_oid = LUSTRE_METADATA_SEQ_MAX_WIDTH;
else
seq->lcs_fid.f_oid = LUSTRE_DATA_SEQ_MAX_WIDTH;
seq->lcs_fid.f_seq = *seqnr;
seq->lcs_fid.f_ver = 0;
/*
* Inform caller that sequence switch is performed to allow it
* to setup FLD for it.
*/
seq_fid_alloc_fini(seq);
mutex_unlock(&seq->lcs_mutex);
return rc;
}
/**
* Allocate new fid on passed client @seq and save it to @fid.
*
* \param[in] env pointer to the thread context
* \param[in,out] seq pointer to the client sequence manager
* \param[out] fid to hold the new allocated fid
*
* \retval 1 for notify the caller that sequence switch
* is performed to allow it to setup FLD for it.
* \retval 0 for new FID allocated in current sequence.
* \retval Negative error number on failure.
*/
int seq_client_alloc_fid(const struct lu_env *env,
struct lu_client_seq *seq, struct lu_fid *fid)
{
wait_queue_t link;
int rc;
ENTRY;
LASSERT(seq != NULL);
LASSERT(fid != NULL);
init_waitqueue_entry(&link, current);
mutex_lock(&seq->lcs_mutex);
if (OBD_FAIL_CHECK(OBD_FAIL_SEQ_EXHAUST))
seq->lcs_fid.f_oid = seq->lcs_width;
while (1) {
u64 seqnr;
if (unlikely(!fid_is_zero(&seq->lcs_fid) &&
fid_oid(&seq->lcs_fid) < seq->lcs_width)) {
/* Just bump last allocated fid and return to caller. */
seq->lcs_fid.f_oid++;
rc = 0;
break;
}
/* Release seq::lcs_mutex via seq_fid_alloc_prep() to avoid
* deadlock during seq_client_alloc_seq(). */
rc = seq_fid_alloc_prep(seq, &link);
if (rc)
continue;
rc = seq_client_alloc_seq(env, seq, &seqnr);
/* Re-take seq::lcs_mutex via seq_fid_alloc_fini(). */
seq_fid_alloc_fini(seq, rc ? 0 : seqnr, false);
if (rc) {
CERROR("%s: Can't allocate new sequence: rc = %d\n",
seq->lcs_name, rc);
mutex_unlock(&seq->lcs_mutex);
RETURN(rc);
}
rc = 1;
break;
}
*fid = seq->lcs_fid;
mutex_unlock(&seq->lcs_mutex);
CDEBUG(D_INFO, "%s: Allocated FID "DFID"\n", seq->lcs_name, PFID(fid));
RETURN(rc);
}
/**
* Allocate the whole non-used seq to the caller.
*
* \param[in] env pointer to the thread context
* \param[in,out] seq pointer to the client sequence manager
* \param[out] seqnr to hold the new allocated sequence
*
* \retval 0 for new sequence allocated.
* \retval Negative error number on failure.
*/
int seq_client_get_seq(const struct lu_env *env,
struct lu_client_seq *seq, u64 *seqnr)
{
wait_queue_t link;
int rc;
LASSERT(seqnr != NULL);
mutex_lock(&seq->lcs_mutex);
init_waitqueue_entry(&link, current);
/* To guarantee that we can get a whole non-used sequence. */
while (seq_fid_alloc_prep(seq, &link) != 0);
rc = seq_client_alloc_seq(env, seq, seqnr);
seq_fid_alloc_fini(seq, rc ? 0 : *seqnr, true);
if (rc)
CERROR("%s: Can't allocate new sequence: rc = %d\n",
seq->lcs_name, rc);
mutex_unlock(&seq->lcs_mutex);
return rc;
}
/* Allocate new fid on passed client @seq and save it to @fid. */
int seq_client_alloc_fid(const struct lu_env *env,
struct lu_client_seq *seq, struct lu_fid *fid)
{
wait_queue_entry_t link;
int rc;
LASSERT(seq);
LASSERT(fid);
init_waitqueue_entry(&link, current);
mutex_lock(&seq->lcs_mutex);
if (OBD_FAIL_CHECK(OBD_FAIL_SEQ_EXHAUST))
seq->lcs_fid.f_oid = seq->lcs_width;
while (1) {
u64 seqnr;
if (!fid_is_zero(&seq->lcs_fid) &&
fid_oid(&seq->lcs_fid) < seq->lcs_width) {
/* Just bump last allocated fid and return to caller. */
seq->lcs_fid.f_oid += 1;
rc = 0;
break;
}
rc = seq_fid_alloc_prep(seq, &link);
if (rc)
continue;
rc = seq_client_alloc_seq(env, seq, &seqnr);
if (rc) {
CERROR("%s: Can't allocate new sequence, rc %d\n",
seq->lcs_name, rc);
seq_fid_alloc_fini(seq);
mutex_unlock(&seq->lcs_mutex);
return rc;
}
CDEBUG(D_INFO, "%s: Switch to sequence [0x%16.16llx]\n",
seq->lcs_name, seqnr);
seq->lcs_fid.f_oid = LUSTRE_FID_INIT_OID;
seq->lcs_fid.f_seq = seqnr;
seq->lcs_fid.f_ver = 0;
/*
* Inform caller that sequence switch is performed to allow it
* to setup FLD for it.
*/
rc = 1;
seq_fid_alloc_fini(seq);
break;
}
*fid = seq->lcs_fid;
mutex_unlock(&seq->lcs_mutex);
CDEBUG(D_INFO,
"%s: Allocated FID " DFID "\n", seq->lcs_name, PFID(fid));
return rc;
}