/* Allocate new sequence for client. */
static int seq_client_alloc_seq(const struct lu_env *env,
struct lu_client_seq *seq, u64 *seqnr)
{
int rc;
LASSERT(lu_seq_range_is_sane(&seq->lcs_space));
if (lu_seq_range_is_exhausted(&seq->lcs_space)) {
rc = seq_client_alloc_meta(env, seq);
if (rc) {
CERROR("%s: Can't allocate new meta-sequence, rc %d\n",
seq->lcs_name, rc);
return rc;
}
CDEBUG(D_INFO, "%s: New range - " DRANGE "\n",
seq->lcs_name, PRANGE(&seq->lcs_space));
} else {
rc = 0;
}
LASSERT(!lu_seq_range_is_exhausted(&seq->lcs_space));
*seqnr = seq->lcs_space.lsr_start;
seq->lcs_space.lsr_start += 1;
CDEBUG(D_INFO, "%s: Allocated sequence [%#llx]\n", seq->lcs_name,
*seqnr);
return rc;
}
/* This function implies that caller takes care about locking. */
int seq_store_write(struct lu_server_seq *seq,
const struct lu_env *env,
struct thandle *th)
{
struct dt_object *dt_obj = seq->lss_obj;
struct seq_thread_info *info;
struct dt_device *dt_dev;
loff_t pos = 0;
int rc;
ENTRY;
dt_dev = lu2dt_dev(seq->lss_obj->do_lu.lo_dev);
info = lu_context_key_get(&env->le_ctx, &seq_thread_key);
LASSERT(info != NULL);
/* Store ranges in le format. */
range_cpu_to_le(&info->sti_space, &seq->lss_space);
rc = dt_obj->do_body_ops->dbo_write(env, dt_obj,
seq_store_buf(info),
&pos, th, BYPASS_CAPA, 1);
if (rc == sizeof(info->sti_space)) {
CDEBUG(D_INFO, "%s: Space - "DRANGE"\n",
seq->lss_name, PRANGE(&seq->lss_space));
rc = 0;
} else if (rc >= 0) {
rc = -EIO;
}
RETURN(rc);
}
/**
* lookup range for a seq passed. note here we only care about the start/end,
* caller should handle the attached location data (flags, index).
*
* \param seq seq for lookup.
* \param range result of lookup.
*
* \retval 0 found, \a range is the matched range;
* \retval -ENOENT not found, \a range is the left-side range;
* \retval -ve other error;
*/
int fld_index_lookup(const struct lu_env *env, struct lu_server_fld *fld,
seqno_t seq, struct lu_seq_range *range)
{
struct lu_seq_range *fld_rec;
struct fld_thread_info *info;
int rc;
ENTRY;
info = lu_context_key_get(&env->le_ctx, &fld_thread_key);
fld_rec = &info->fti_rec;
rc = fld_cache_lookup(fld->lsf_cache, seq, fld_rec);
if (rc == 0) {
*range = *fld_rec;
if (range_within(range, seq))
rc = 0;
else
rc = -ENOENT;
}
CDEBUG(D_INFO, "%s: lookup seq = "LPX64" range : "DRANGE" rc = %d\n",
fld->lsf_name, seq, PRANGE(range), rc);
RETURN(rc);
}
static int __seq_server_alloc_meta(struct lu_server_seq *seq,
struct lu_seq_range *out,
const struct lu_env *env)
{
struct lu_seq_range *space = &seq->lss_space;
int rc = 0;
ENTRY;
LASSERT(lu_seq_range_is_sane(space));
rc = seq_server_check_and_alloc_super(env, seq);
if (rc < 0) {
CERROR("%s: Allocated super-sequence failed: rc = %d\n",
seq->lss_name, rc);
RETURN(rc);
}
rc = range_alloc_set(env, out, seq);
if (rc != 0) {
CERROR("%s: Allocated meta-sequence failed: rc = %d\n",
seq->lss_name, rc);
RETURN(rc);
}
CDEBUG(D_INFO, "%s: Allocated meta-sequence " DRANGE"\n",
seq->lss_name, PRANGE(out));
RETURN(rc);
}
int seq_server_alloc_spec(struct lu_server_seq *seq,
struct lu_seq_range *spec,
const struct lu_env *env)
{
struct lu_seq_range *space = &seq->lss_space;
int rc = -ENOSPC;
ENTRY;
/*
* In some cases (like recovery after a disaster)
* we may need to allocate sequences manually
* Notice some sequences can be lost if requested
* range doesn't start at the beginning of current
* free space. Also notice it's not possible now
* to allocate sequences out of natural order.
*/
if (spec->lsr_start >= spec->lsr_end)
RETURN(-EINVAL);
if (spec->lsr_flags != LU_SEQ_RANGE_MDT &&
spec->lsr_flags != LU_SEQ_RANGE_OST)
RETURN(-EINVAL);
mutex_lock(&seq->lss_mutex);
if (spec->lsr_start >= space->lsr_start) {
space->lsr_start = spec->lsr_end;
rc = seq_store_update(env, seq, spec, 1 /* sync */);
LCONSOLE_INFO("%s: "DRANGE" sequences allocated: rc = %d \n",
seq->lss_name, PRANGE(spec), rc);
}
mutex_unlock(&seq->lss_mutex);
RETURN(rc);
}
/*
* This function implies that caller takes care about locking or locking is not
* needed (init time).
*/
int seq_store_read(struct lu_server_seq *seq,
const struct lu_env *env)
{
struct dt_object *dt_obj = seq->lss_obj;
struct seq_thread_info *info;
loff_t pos = 0;
int rc;
ENTRY;
info = lu_context_key_get(&env->le_ctx, &seq_thread_key);
LASSERT(info != NULL);
rc = dt_obj->do_body_ops->dbo_read(env, dt_obj, seq_store_buf(info),
&pos, BYPASS_CAPA);
if (rc == sizeof(info->sti_space)) {
range_le_to_cpu(&seq->lss_space, &info->sti_space);
CDEBUG(D_INFO, "%s: Space - "DRANGE"\n",
seq->lss_name, PRANGE(&seq->lss_space));
rc = 0;
} else if (rc == 0) {
rc = -ENODATA;
} else if (rc >= 0) {
CERROR("%s: Read only %d bytes of %d\n", seq->lss_name,
rc, (int)sizeof(info->sti_space));
rc = -EIO;
}
RETURN(rc);
}
/**
* Lookup sequece in local cache/fldb.
**/
int fld_local_lookup(const struct lu_env *env, struct lu_server_fld *fld,
u64 seq, struct lu_seq_range *range)
{
struct lu_seq_range *erange;
struct fld_thread_info *info;
int rc;
ENTRY;
info = lu_context_key_get(&env->le_ctx, &fld_thread_key);
LASSERT(info != NULL);
erange = &info->fti_lrange;
/* Lookup it in the cache. */
rc = fld_cache_lookup(fld->lsf_cache, seq, erange);
if (rc == 0) {
if (unlikely(fld_range_type(erange) != fld_range_type(range) &&
!fld_range_is_any(range))) {
CERROR("%s: FLD cache range "DRANGE" does not match"
"requested flag %x: rc = %d\n", fld->lsf_name,
PRANGE(erange), range->lsr_flags, -EIO);
RETURN(-EIO);
}
*range = *erange;
RETURN(0);
}
RETURN(rc);
}
int fld_index_lookup(struct lu_server_fld *fld,
const struct lu_env *env,
seqno_t seq,
struct lu_seq_range *range)
{
struct dt_object *dt_obj = fld->lsf_obj;
struct lu_seq_range *fld_rec;
struct dt_key *key = fld_key(env, seq);
struct fld_thread_info *info;
int rc;
ENTRY;
info = lu_context_key_get(&env->le_ctx, &fld_thread_key);
fld_rec = &info->fti_rec;
rc = dt_obj->do_index_ops->dio_lookup(env, dt_obj,
(struct dt_rec*) fld_rec,
key, BYPASS_CAPA);
if (rc >= 0) {
range_be_to_cpu(fld_rec, fld_rec);
*range = *fld_rec;
if (range_within(range, seq))
rc = 0;
else
rc = -ENOENT;
}
CDEBUG(D_INFO, "%s: lookup seq = "LPX64" range : "DRANGE" rc = %d\n",
fld->lsf_name, seq, PRANGE(range), rc);
RETURN(rc);
}
/**
* All MDT server handle fld lookup operation. But only MDT0 has fld index.
* if entry is not found in cache we need to forward lookup request to MDT0
*/
static int fld_handle_lookup(struct tgt_session_info *tsi)
{
struct obd_export *exp = tsi->tsi_exp;
struct lu_site *site = exp->exp_obd->obd_lu_dev->ld_site;
struct lu_server_fld *fld;
struct lu_seq_range *in;
struct lu_seq_range *out;
int rc;
ENTRY;
in = req_capsule_client_get(tsi->tsi_pill, &RMF_FLD_MDFLD);
if (in == NULL)
RETURN(err_serious(-EPROTO));
rc = req_capsule_server_pack(tsi->tsi_pill);
if (unlikely(rc != 0))
RETURN(err_serious(rc));
out = req_capsule_server_get(tsi->tsi_pill, &RMF_FLD_MDFLD);
if (out == NULL)
RETURN(err_serious(-EPROTO));
*out = *in;
fld = lu_site2seq(site)->ss_server_fld;
rc = fld_server_lookup(tsi->tsi_env, fld, in->lsr_start, out);
CDEBUG(D_INFO, "%s: FLD req handle: error %d (range: "DRANGE")\n",
fld->lsf_name, rc, PRANGE(out));
RETURN(rc);
}
int fld_index_create(struct lu_server_fld *fld,
const struct lu_env *env,
const struct lu_seq_range *range,
struct thandle *th)
{
struct dt_object *dt_obj = fld->lsf_obj;
struct dt_device *dt_dev;
seqno_t start;
int rc;
ENTRY;
start = range->lsr_start;
LASSERT(range_is_sane(range));
dt_dev = lu2dt_dev(fld->lsf_obj->do_lu.lo_dev);
rc = dt_obj->do_index_ops->dio_insert(env, dt_obj,
fld_rec(env, range),
fld_key(env, start),
th, BYPASS_CAPA, 1);
CDEBUG(D_INFO, "%s: insert given range : "DRANGE" rc = %d\n",
fld->lsf_name, PRANGE(range), rc);
RETURN(rc);
}
static int mdd_fill_fldb(const struct lu_env *env, struct mdd_device *mdd)
{
struct seq_server_site *ss = mdd_seq_site(mdd);
struct lu_seq_range range;
int rc;
LASSERT(ss->ss_server_seq != NULL);
LASSERT(ss->ss_server_fld != NULL);
if (ss->ss_server_seq->lss_space.lsr_end == 0)
return 0;
memcpy(&range, &ss->ss_server_seq->lss_space, sizeof(range));
/* Pre-existing ZFS does not insert any entries to FLDB, we need
* to insert it to FLDB during convertion */
range.lsr_start = FID_SEQ_NORMAL;
fld_range_set_mdt(&range);
mutex_lock(&ss->ss_server_fld->lsf_lock);
rc = fld_insert_entry(env, ss->ss_server_fld, &range);
mutex_unlock(&ss->ss_server_fld->lsf_lock);
LCONSOLE_INFO("%s: insert missing range "DRANGE"\n",
mdd2obd_dev(mdd)->obd_name, PRANGE(&range));
return rc;
}
static int __seq_server_alloc_super(struct lu_server_seq *seq,
struct lu_seq_range *out,
const struct lu_env *env)
{
struct lu_seq_range *space = &seq->lss_space;
int rc;
ENTRY;
LASSERT(range_is_sane(space));
if (range_is_exhausted(space)) {
CERROR("%s: Sequences space is exhausted\n",
seq->lss_name);
RETURN(-ENOSPC);
} else {
range_alloc(out, space, seq->lss_width);
}
rc = seq_store_update(env, seq, out, 1 /* sync */);
CDEBUG(D_INFO, "%s: super-sequence allocation rc = %d "
DRANGE"\n", seq->lss_name, rc, PRANGE(out));
RETURN(rc);
}
/* Allocate new sequence for client. */
static int seq_client_alloc_seq(const struct lu_env *env,
struct lu_client_seq *seq, seqno_t *seqnr)
{
int rc;
ENTRY;
LASSERT(range_is_sane(&seq->lcs_space));
if (range_is_exhausted(&seq->lcs_space)) {
rc = seq_client_alloc_meta(env, seq);
if (rc) {
CERROR("%s: Can't allocate new meta-sequence,"
"rc %d\n", seq->lcs_name, rc);
RETURN(rc);
} else {
CDEBUG(D_INFO, "%s: New range - "DRANGE"\n",
seq->lcs_name, PRANGE(&seq->lcs_space));
}
} else {
rc = 0;
}
LASSERT(!range_is_exhausted(&seq->lcs_space));
*seqnr = seq->lcs_space.lsr_start;
seq->lcs_space.lsr_start += 1;
CDEBUG(D_INFO, "%s: Allocated sequence ["LPX64"]\n", seq->lcs_name,
*seqnr);
RETURN(rc);
}
static int
seq_proc_read_common(char *page, char **start, off_t off,
int count, int *eof, void *data,
struct lu_seq_range *range)
{
int rc;
ENTRY;
*eof = 1;
rc = snprintf(page, count, "["LPX64" - "LPX64"]:%x:%x\n",
PRANGE(range));
RETURN(rc);
}
static int
lprocfs_fid_space_seq_show(struct seq_file *m, void *unused)
{
struct lu_client_seq *seq = (struct lu_client_seq *)m->private;
int rc;
LASSERT(seq != NULL);
mutex_lock(&seq->lcs_mutex);
rc = seq_printf(m, "["LPX64" - "LPX64"]:%x:%s\n", PRANGE(&seq->lcs_space));
mutex_unlock(&seq->lcs_mutex);
return rc;
}
/*
* 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 (lu_seq_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 (lu_seq_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(lu_seq_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(!lu_seq_range_is_exhausted(loset) ||
lu_seq_range_is_sane(loset),
DRANGE"\n", PRANGE(loset));
if (rc == 0)
range_alloc(out, loset, seq->lss_width);
RETURN(rc);
}
int fld_index_delete(struct lu_server_fld *fld,
const struct lu_env *env,
struct lu_seq_range *range,
struct thandle *th)
{
struct dt_object *dt_obj = fld->lsf_obj;
seqno_t seq = range->lsr_start;
int rc;
ENTRY;
rc = dt_obj->do_index_ops->dio_delete(env, dt_obj, fld_key(env, seq),
th, BYPASS_CAPA);
CDEBUG(D_INFO, "%s: delete given range : "DRANGE" rc = %d\n",
fld->lsf_name, PRANGE(range), rc);
RETURN(rc);
}
static int __seq_server_alloc_meta(struct lu_server_seq *seq,
struct lu_seq_range *out,
const struct lu_env *env)
{
struct lu_seq_range *space = &seq->lss_space;
int rc = 0;
ENTRY;
LASSERT(range_is_sane(space));
/* Check if available space ends and allocate new super seq */
if (range_is_exhausted(space)) {
if (!seq->lss_cli) {
CERROR("%s: No sequence controller is attached.\n",
seq->lss_name);
RETURN(-ENODEV);
}
rc = seq_client_alloc_super(seq->lss_cli, env);
if (rc) {
CERROR("%s: Can't allocate super-sequence, rc %d\n",
seq->lss_name, rc);
RETURN(rc);
}
/* Saving new range to allocation space. */
*space = seq->lss_cli->lcs_space;
LASSERT(range_is_sane(space));
}
rc = range_alloc_set(env, out, seq);
if (rc != 0) {
CERROR("%s: Allocated meta-sequence failed: rc = %d\n",
seq->lss_name, rc);
RETURN(rc);
}
CDEBUG(D_INFO, "%s: Allocated meta-sequence " DRANGE"\n",
seq->lss_name, PRANGE(out));
RETURN(rc);
}
/* Client side procfs stuff */
static ssize_t
lprocfs_fid_space_seq_write(struct file *file, const char *buffer,
size_t count, loff_t *off)
{
struct lu_client_seq *seq = ((struct seq_file *)file->private_data)->private;
int rc;
LASSERT(seq != NULL);
mutex_lock(&seq->lcs_mutex);
rc = lprocfs_fid_write_common(buffer, count, &seq->lcs_space);
if (rc == 0) {
CDEBUG(D_INFO, "%s: Space: "DRANGE"\n",
seq->lcs_name, PRANGE(&seq->lcs_space));
}
mutex_unlock(&seq->lcs_mutex);
return count;
}
/*
* Server side procfs stuff.
*/
static int
seq_server_proc_write_space(struct file *file, const char *buffer,
unsigned long count, void *data)
{
struct lu_server_seq *seq = (struct lu_server_seq *)data;
int rc;
ENTRY;
LASSERT(seq != NULL);
cfs_down(&seq->lss_sem);
rc = seq_proc_write_common(file, buffer, count,
data, &seq->lss_space);
if (rc == 0) {
CDEBUG(D_INFO, "%s: Space: "DRANGE"\n",
seq->lss_name, PRANGE(&seq->lss_space));
}
cfs_up(&seq->lss_sem);
RETURN(count);
}
static int seq_client_rpc(struct lu_client_seq *seq,
struct lu_seq_range *output, __u32 opc,
const char *opcname)
{
struct obd_export *exp = seq->lcs_exp;
struct ptlrpc_request *req;
struct lu_seq_range *out, *in;
__u32 *op;
unsigned int debug_mask;
int rc;
ENTRY;
LASSERT(exp != NULL && !IS_ERR(exp));
req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp), &RQF_SEQ_QUERY,
LUSTRE_MDS_VERSION, SEQ_QUERY);
if (req == NULL)
RETURN(-ENOMEM);
/* Init operation code */
op = req_capsule_client_get(&req->rq_pill, &RMF_SEQ_OPC);
*op = opc;
/* Zero out input range, this is not recovery yet. */
in = req_capsule_client_get(&req->rq_pill, &RMF_SEQ_RANGE);
lu_seq_range_init(in);
ptlrpc_request_set_replen(req);
in->lsr_index = seq->lcs_space.lsr_index;
if (seq->lcs_type == LUSTRE_SEQ_METADATA)
fld_range_set_mdt(in);
else
fld_range_set_ost(in);
if (opc == SEQ_ALLOC_SUPER) {
req->rq_request_portal = SEQ_CONTROLLER_PORTAL;
req->rq_reply_portal = MDC_REPLY_PORTAL;
/* During allocating super sequence for data object,
* the current thread might hold the export of MDT0(MDT0
* precreating objects on this OST), and it will send the
* request to MDT0 here, so we can not keep resending the
* request here, otherwise if MDT0 is failed(umounted),
* it can not release the export of MDT0 */
if (seq->lcs_type == LUSTRE_SEQ_DATA)
req->rq_no_delay = req->rq_no_resend = 1;
debug_mask = D_CONSOLE;
} else {
if (seq->lcs_type == LUSTRE_SEQ_METADATA) {
req->rq_reply_portal = MDC_REPLY_PORTAL;
req->rq_request_portal = SEQ_METADATA_PORTAL;
} else {
req->rq_reply_portal = OSC_REPLY_PORTAL;
req->rq_request_portal = SEQ_DATA_PORTAL;
}
debug_mask = D_INFO;
}
/* Allow seq client RPC during recovery time. */
req->rq_allow_replay = 1;
ptlrpc_at_set_req_timeout(req);
rc = ptlrpc_queue_wait(req);
if (rc)
GOTO(out_req, rc);
out = req_capsule_server_get(&req->rq_pill, &RMF_SEQ_RANGE);
*output = *out;
if (!lu_seq_range_is_sane(output)) {
CERROR("%s: Invalid range received from server: "
DRANGE"\n", seq->lcs_name, PRANGE(output));
GOTO(out_req, rc = -EINVAL);
}
if (lu_seq_range_is_exhausted(output)) {
CERROR("%s: Range received from server is exhausted: "
DRANGE"]\n", seq->lcs_name, PRANGE(output));
GOTO(out_req, rc = -EINVAL);
}
CDEBUG_LIMIT(debug_mask, "%s: Allocated %s-sequence "DRANGE"]\n",
seq->lcs_name, opcname, PRANGE(output));
EXIT;
out_req:
ptlrpc_req_finished(req);
return rc;
}
static int seq_client_rpc(struct lu_client_seq *seq,
struct lu_seq_range *output, __u32 opc,
const char *opcname)
{
struct obd_export *exp = seq->lcs_exp;
struct ptlrpc_request *req;
struct lu_seq_range *out, *in;
__u32 *op;
int rc;
ENTRY;
req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp), &RQF_SEQ_QUERY,
LUSTRE_MDS_VERSION, SEQ_QUERY);
if (req == NULL)
RETURN(-ENOMEM);
/* Init operation code */
op = req_capsule_client_get(&req->rq_pill, &RMF_SEQ_OPC);
*op = opc;
/* Zero out input range, this is not recovery yet. */
in = req_capsule_client_get(&req->rq_pill, &RMF_SEQ_RANGE);
range_init(in);
ptlrpc_request_set_replen(req);
if (seq->lcs_type == LUSTRE_SEQ_METADATA) {
req->rq_request_portal = SEQ_METADATA_PORTAL;
in->lsr_flags = LU_SEQ_RANGE_MDT;
} else {
LASSERTF(seq->lcs_type == LUSTRE_SEQ_DATA,
"unknown lcs_type %u\n", seq->lcs_type);
req->rq_request_portal = SEQ_DATA_PORTAL;
in->lsr_flags = LU_SEQ_RANGE_OST;
}
if (opc == SEQ_ALLOC_SUPER) {
/* Update index field of *in, it is required for
* FLD update on super sequence allocator node. */
in->lsr_index = seq->lcs_space.lsr_index;
req->rq_request_portal = SEQ_CONTROLLER_PORTAL;
} else {
LASSERTF(opc == SEQ_ALLOC_META,
"unknown opcode %u\n, opc", opc);
}
ptlrpc_at_set_req_timeout(req);
mdc_get_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
rc = ptlrpc_queue_wait(req);
mdc_put_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL);
if (rc)
GOTO(out_req, rc);
out = req_capsule_server_get(&req->rq_pill, &RMF_SEQ_RANGE);
*output = *out;
if (!range_is_sane(output)) {
CERROR("%s: Invalid range received from server: "
DRANGE"\n", seq->lcs_name, PRANGE(output));
GOTO(out_req, rc = -EINVAL);
}
if (range_is_exhausted(output)) {
CERROR("%s: Range received from server is exhausted: "
DRANGE"]\n", seq->lcs_name, PRANGE(output));
GOTO(out_req, rc = -EINVAL);
}
CDEBUG(D_INFO, "%s: Allocated %s-sequence "DRANGE"]\n",
seq->lcs_name, opcname, PRANGE(output));
EXIT;
out_req:
ptlrpc_req_finished(req);
return rc;
}
/**
* fix list by checking new entry with NEXT entry in order.
*/
static void fld_fix_new_list(struct fld_cache *cache)
{
struct fld_cache_entry *f_curr;
struct fld_cache_entry *f_next;
struct lu_seq_range *c_range;
struct lu_seq_range *n_range;
struct list_head *head = &cache->fci_entries_head;
restart_fixup:
list_for_each_entry_safe(f_curr, f_next, head, fce_list) {
c_range = &f_curr->fce_range;
n_range = &f_next->fce_range;
LASSERT(lu_seq_range_is_sane(c_range));
if (&f_next->fce_list == head)
break;
if (c_range->lsr_flags != n_range->lsr_flags)
continue;
LASSERTF(c_range->lsr_start <= n_range->lsr_start,
"cur lsr_start "DRANGE" next lsr_start "DRANGE"\n",
PRANGE(c_range), PRANGE(n_range));
/* check merge possibility with next range */
if (c_range->lsr_end == n_range->lsr_start) {
if (c_range->lsr_index != n_range->lsr_index)
continue;
n_range->lsr_start = c_range->lsr_start;
fld_cache_entry_delete(cache, f_curr);
continue;
}
/* check if current range overlaps with next range. */
if (n_range->lsr_start < c_range->lsr_end) {
if (c_range->lsr_index == n_range->lsr_index) {
n_range->lsr_start = c_range->lsr_start;
n_range->lsr_end = max(c_range->lsr_end,
n_range->lsr_end);
fld_cache_entry_delete(cache, f_curr);
} else {
if (n_range->lsr_end <= c_range->lsr_end) {
*n_range = *c_range;
fld_cache_entry_delete(cache, f_curr);
} else {
n_range->lsr_start = c_range->lsr_end;
}
}
/* we could have overlap over next
* range too. better restart.
*/
goto restart_fixup;
}
/* kill duplicates */
if (c_range->lsr_start == n_range->lsr_start &&
c_range->lsr_end == n_range->lsr_end)
fld_cache_entry_delete(cache, f_curr);
}
/**
* insert range in fld store.
*
* \param range range to be inserted
* \param th transaction for this operation as it could compound
* transaction.
*
* \retval 0 success
* \retval -ve error
*
* The whole fld index insertion is protected by seq->lss_mutex (see
* seq_server_alloc_super), i.e. only one thread will access fldb each
* time, so we do not need worry the fld file and cache will being
* changed between declare and create.
* Because the fld entry can only be increamental, so we will only check
* whether it can be merged from the left.
**/
int fld_index_create(const struct lu_env *env, struct lu_server_fld *fld,
const struct lu_seq_range *new_range, struct thandle *th)
{
struct lu_seq_range *range;
struct lu_seq_range *tmp;
struct fld_thread_info *info;
int rc = 0;
int deleted = 0;
struct fld_cache_entry *flde;
ENTRY;
info = lu_context_key_get(&env->le_ctx, &fld_thread_key);
LASSERT_MUTEX_LOCKED(&fld->lsf_lock);
range = &info->fti_lrange;
memset(range, 0, sizeof(*range));
tmp = &info->fti_irange;
rc = fld_index_lookup(env, fld, new_range->lsr_start, range);
if (rc != -ENOENT) {
rc = rc == 0 ? -EEXIST : rc;
GOTO(out, rc);
}
if (new_range->lsr_start == range->lsr_end && range->lsr_end != 0 &&
range_compare_loc(new_range, range) == 0) {
range_cpu_to_be(tmp, range);
rc = dt_delete(env, fld->lsf_obj,
(struct dt_key *)&tmp->lsr_start, th,
BYPASS_CAPA);
if (rc != 0)
GOTO(out, rc);
memcpy(tmp, new_range, sizeof(*new_range));
tmp->lsr_start = range->lsr_start;
deleted = 1;
} else {
memcpy(tmp, new_range, sizeof(*new_range));
}
range_cpu_to_be(tmp, tmp);
rc = dt_insert(env, fld->lsf_obj, (struct dt_rec *)tmp,
(struct dt_key *)&tmp->lsr_start, th, BYPASS_CAPA, 1);
if (rc != 0) {
CERROR("%s: insert range "DRANGE" failed: rc = %d\n",
fld->lsf_name, PRANGE(new_range), rc);
GOTO(out, rc);
}
flde = fld_cache_entry_create(new_range);
if (IS_ERR(flde))
GOTO(out, rc = PTR_ERR(flde));
write_lock(&fld->lsf_cache->fci_lock);
if (deleted)
fld_cache_delete_nolock(fld->lsf_cache, new_range);
rc = fld_cache_insert_nolock(fld->lsf_cache, flde);
write_unlock(&fld->lsf_cache->fci_lock);
if (rc)
OBD_FREE_PTR(flde);
out:
RETURN(rc);
}
