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Date: Wed, 08 Sep 2010 16:45:37 -0700
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: Konrad Rzeszutek Wilk <konrad@...nok.org>
Cc: linux-scsi <linux-scsi@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
Mike Christie <michaelc@...wisc.edu>,
Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
James Bottomley <James.Bottomley@...e.de>,
Jens Axboe <axboe@...nel.dk>,
Boaz Harrosh <bharrosh@...asas.com>
Subject: Re: [RFC 05/22] tcm: Add SPC-4 explict and implict Asymmetric
Logical Unit Access (ALUA)
On Tue, 2010-09-07 at 22:34 -0400, Konrad Rzeszutek Wilk wrote:
> On Monday 30 August 2010 05:20:48 Nicholas A. Bellinger wrote:
> > +/*
> > + * REPORT_TARGET_PORT_GROUPS
> > + *
> > + * See spc4r17 section 6.27
> > + */
> > +int core_scsi3_emulate_report_target_port_groups(struct se_cmd
> *cmd)
>
> Is there any added benefit of having such a long name? How about
> 'alua_report_tgp' ?
Not really. I try to keep the spec defined CDB names for functions like
this doing the actual CDB emulation.
How about core_emulate_report_target_port_groups()..?
>
> > +{
> > + struct se_subsystem_dev *su_dev = SE_DEV(cmd)->se_sub_dev;
> > + struct se_port *port;
> > + struct t10_alua_tg_pt_gp *tg_pt_gp;
> > + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
> > + unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
> > + u32 rd_len = 0, off = 4;
>
> Offset is at 4, .. is there anything you need to do between 0 and 3 ?
> Set it
> to zero or what not? Ah, at the end of the function you fill it in.
> Can you
> add a comment here saying that. Similar to what did
> in 'core_scsi3_emulate_set_target_port_groups' ?
<nod> comment added here.
> > +
> > + spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > + list_for_each_entry(tg_pt_gp, &T10_ALUA(su_dev)->tg_pt_gps_list,
> > + tg_pt_gp_list) {
> > + /*
> > + * PREF: Preferred target port bit, determine if this
> > + * bit should be set for port group.
> > + */
> > + if (tg_pt_gp->tg_pt_gp_pref)
>
> Yeah, this looks ugly. By looking at this I already know that the
> structure is
> tg_pt_gp, and then I get to see it once more.
Hmmm, I agree that this is somewhat ugly. The reason that I use
'tg_pt_gp' variable names instead of say 'tpg' is because there are a
number of locations outside of target_core_alua.c where 'tpg' referrs to
struct se_portal_group.
So because of this I have been try to keep everything releated to ALUA
target port groups known as 'tg_pt_gp'.
>
> > + buf[off] = 0x80;
> > + /*
> > + * Set the ASYMMETRIC ACCESS State
> > + */
> > + buf[off++] |= (atomic_read(
> > + &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
>
> Ditto.
> > + /*
> > + * Set supported ASYMMETRIC ACCESS State bits
> > + */
> > + buf[off] = 0x80; /* T_SUP */
> > + buf[off] |= 0x40; /* O_SUP */
> > + buf[off] |= 0x8; /* U_SUP */
> > + buf[off] |= 0x4; /* S_SUP */
> > + buf[off] |= 0x2; /* AN_SUP */
> > + buf[off++] |= 0x1; /* AO_SUP */
> > + /*
> > + * TARGET PORT GROUP
> > + */
> > + buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
> > + buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
> > +
> > + off++; /* Skip over Reserved */
> > + /*
> > + * STATUS CODE
> > + */
> > + buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
>
> Hmm, so you used atomic_read earlier on. Here it does not matter what
> the
> state of it is?
Correct. So the tg_pt_gp_alua_access_status is actually an
informational value set in report_target_port_groups() to signal if the
ALUA op was an explict or implict operation. This does not need to be
atomic.
>
> > + /*
> > + * Vendor Specific field
> > + */
> > + buf[off++] = 0x00;
> > + /*
> > + * TARGET PORT COUNT
> > + */
> > + buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
> > + rd_len += 8;
> > +
> > + spin_lock(&tg_pt_gp->tg_pt_gp_lock);
> > + list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
> > + tg_pt_gp_mem_list) {
> > + port = tg_pt_gp_mem->tg_pt;
> > + /*
> > + * Start Target Port descriptor format
> > + *
> > + * See spc4r17 section 6.2.7 Table 247
> > + */
> > + off += 2; /* Skip over Obsolete */
> > + /*
> > + * Set RELATIVE TARGET PORT IDENTIFIER
> > + */
> > + buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
> > + buf[off++] = (port->sep_rtpi & 0xff);
> > + rd_len += 4;
> > + }
> > + spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
> > + }
> > + spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > + /*
> > + * Set the RETURN DATA LENGTH set in the header of the DataIN
> Payload
> > + */
> > + buf[0] = ((rd_len >> 24) & 0xff);
> > + buf[1] = ((rd_len >> 16) & 0xff);
> > + buf[2] = ((rd_len >> 8) & 0xff);
> > + buf[3] = (rd_len & 0xff);
> > +
> > + return 0;
> > +}
> > +
> > +/*
> > + * SET_TARGET_PORT_GROUPS for explict ALUA operation.
> > + *
> > + * See spc4r17 section 6.35
> > + */
> > +int core_scsi3_emulate_set_target_port_groups(struct se_cmd *cmd)
>
> The same question. Can you shorten the name ?
Is core_emulate_set_target_port_groups() acceptable..?
> > +{
> > + struct se_device *dev = SE_DEV(cmd);
> > + struct se_subsystem_dev *su_dev = SE_DEV(cmd)->se_sub_dev;
> > + struct se_port *port, *l_port = SE_LUN(cmd)->lun_sep;
> > + struct se_node_acl *nacl = SE_SESS(cmd)->se_node_acl;
> > + struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
> > + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem;
> > + unsigned char *buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
> > + unsigned char *ptr = &buf[4]; /* Skip over RESERVED area in header
> */
> > + u32 len = 4; /* Skip over RESERVED area in header */
> > + int alua_access_state, primary = 0, ret;
>
> It is called ret, but in actuality you are using it more like an 'rc'.
Fixed.
>
> > + u16 tg_pt_id, rtpi;
> > +
> > + if (!(l_port))
> > + return -1;
>
> Um, what error code is that? Should you define this in your
> enums/#defines?
>
Whoops, this should be PYX_TRANSPORT_LU_COMM_FAILURE. Fixed
> > + /*
> > + * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed
> > + * for the local tg_pt_gp.
> > + */
> > + l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem;
> > + if (!(l_tg_pt_gp_mem)) {
> > + printk(KERN_ERR "Unable to access *l_tg_pt_gp_mem\n");
>
> How will this help the user/maintainer troubleshoot this?
Ok, this is really never expected to happen, but I added a slightly more
helpful printk() here.
>
> > + return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
> > + }
> > + spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > + l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp;
> > + if (!(l_tg_pt_gp)) {
> > + spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > + printk(KERN_ERR "Unable to access *l_l_tg_pt_gp\n");
>
> Ditto.
Also, this is really never expected to happen, but I added a slightly
more helpful printk() here.
> > + return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
> > + }
> > + ret = (l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA);
> > + spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > +
> > + if (!(ret)) {
> > + printk(KERN_INFO "Unable to process SET_TARGET_PORT_GROUPS"
> > + " while TPGS_EXPLICT_ALUA is disabled\n");
>
> Little better, but the error code is the same as for the earlier
> return. So
> should it be different perhaps? Or if not, should you change it from
> KERN_INFO to KERN_ERR?
Ok, we can reach this if Explict ALUA is disabled via configfs.
Changing this to KERN_INFO.
>
> > + return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
> > + }
> > +
> > + while (len < cmd->data_length) {
> > + alua_access_state = (ptr[0] & 0x0f);
> > + /*
> > + * Check the received ALUA access state, and determine if
> > + * the state is a primary or secondary target port asymmetric
> > + * access state.
> > + */
> > + ret = core_alua_check_transition(alua_access_state, &primary);
> > + if (ret != 0) {
> > + /*
> > + * If the SET TARGET PORT GROUPS attempts to establish
> > + * an invalid combination of target port asymmetric
> > + * access states or attempts to establish an
> > + * unsupported target port asymmetric access state,
> > + * then the command shall be terminated with CHECK
> > + * CONDITION status, with the sense key set to ILLEGAL
> > + * REQUEST, and the additional sense code set to INVALID
> > + * FIELD IN PARAMETER LIST.
> > + */
> > + return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
> > + }
> > + ret = -1;
> > + /*
> > + * If the ASYMMETRIC ACCESS STATE field (see table 267)
> > + * specifies a primary target port asymmetric access state,
> > + * then the TARGET PORT GROUP OR TARGET PORT field specifies
> > + * a primary target port group for which the primary target
> > + * port asymmetric access state shall be changed. If the
> > + * ASYMMETRIC ACCESS STATE field specifies a secondary target
> > + * port asymmetric access state, then the TARGET PORT GROUP OR
> > + * TARGET PORT field specifies the relative target port
> > + * identifier (see 3.1.120) of the target port for which the
> > + * secondary target port asymmetric access state shall be
> > + * changed.
> > + */
> > + if (primary) {
> > + tg_pt_id = ((ptr[2] << 8) & 0xff);
> > + tg_pt_id |= (ptr[3] & 0xff);
> > + /*
> > + * Locate the matching target port group ID from
> > + * the global tg_pt_gp list
> > + */
> > + spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > + list_for_each_entry(tg_pt_gp,
> > + &T10_ALUA(su_dev)->tg_pt_gps_list,
> > + tg_pt_gp_list) {
> > + if (!(tg_pt_gp->tg_pt_gp_valid_id))
> > + continue;
> > +
> > + if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
> > + continue;
> > +
> > + atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
> > + smp_mb__after_atomic_inc();
>
> So, the barrier() here enforces that the gcc compiler create the code
> in this
> specific order. And looking at atomic_inc it uses the 'volatile' which
> does
> the same exact trick. I think you don't need this? Or did you get hit
> this at
> some point with instructions being re-order?
Yes, the barrier is needed here because the tg_pt_gp->tg_pt_gp_ref_cnt
is expected to be read on a per struct t10_alua_tg_pt_gp basis without
the T10_ALUA(su_dev)->tg_pt_gps_lock being help elsewhere.
>
> > + spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > +
> > + ret = core_alua_do_port_transition(tg_pt_gp,
> > + dev, l_port, nacl,
> > + alua_access_state, 1);
> > +
> > + spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
>
> Actually, I am not understanding your usage of spin_lock here. It
> usually is
> used to access a critical section, but you are already using a simple
> mechanism for this: the atomic inc/dec which atomically does this
> operation
> across _all_ CPUs.
>
> So if the spinlock is just for incrementing/decrementing that _ref_cnt
> value
> you can get rid off it.
T10_ALUA(su_dev)->tg_pt_gps_lock is used to protect the
10_ALUA(su_dev)->tg_pt_gps_list list, and not individual structure non
list_head member in struct t10_alua_tg_pt_gp.
>
> > + atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
> > + smp_mb__after_atomic_dec();
> > + break;
> > + }
> > + spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > + /*
> > + * If not matching target port group ID can be located
> > + * throw an exception with ASCQ: INVALID_PARAMETER_LIST
> > + */
> > + if (ret != 0)
> > + return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
> > + } else {
> > + rtpi = ((ptr[2] << 8) & 0xff);
> > + rtpi |= (ptr[3] & 0xff);
>
> Magic stuff. How about a comment that explains this bitshifting.
Done.
> > + /*
> > + * Locate the matching relative target port identifer
> > + * for the struct se_device storage object.
> > + */
> > + spin_lock(&dev->se_port_lock);
> > + list_for_each_entry(port, &dev->dev_sep_list,
> > + sep_list) {
> > + if (port->sep_rtpi != rtpi)
> > + continue;
> > +
> > + tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
> > + spin_unlock(&dev->se_port_lock);
> > +
> > + ret = core_alua_set_tg_pt_secondary_state(
> > + tg_pt_gp_mem, port, 1, 1);
> > +
> > + spin_lock(&dev->se_port_lock);
> > + break;
> > + }
> > + spin_unlock(&dev->se_port_lock);
>
> you could probably avoid all of this spin lock/unlocking by using a
> list_for_each_entry_safe variant?
Unfortuately this cannot be avoided and this code cannot hold
dev->se_port_lock while calling core_alua_set_tg_pt_secondary_state(),
because it is expected to obtain a different struct
t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock.
>
> > + /*
> > + * If not matching relative target port identifier can
> > + * be located, throw an exception with ASCQ:
> > + * INVALID_PARAMETER_LIST
> > + */
> > + if (ret != 0)
> > + return PYX_TRANSPORT_INVALID_PARAMETER_LIST;
>
> Do those #define/enum's have negative values for failures? I am asking
> b/c
> this function returns -1, 0, PYX_* and one mistake is to sometimes
> check the
> return value of just (if (blah)>0)) at which point if the PYX_ were
> positive
> you would think it is OK, but in actuality it was a failure.
Correct, all of the PYX_TRANSPORT_* defs are using negative values.
> > + }
> > +
> > + ptr += 4;
> > + len += 4;
> > + }
> > +
> > + return 0;
>
> no #define or enum for success?
Nope, this function is expected to return zero on success.
> > +}
> > +
> > +static inline int core_alua_state_optimized(
> > + struct se_cmd *cmd,
> > + unsigned char *cdb,
> > + u8 *alua_ascq)
> > +{
> > + /*
> > + * For the Optimized ALUA access state case, we want to process
> the
> > + * incoming fabric cmd ASAP..
>
> Ok, and we do that by returning zero. Why not just remove this
> function
> altogether and have the function that calls this check if this value
> is
> filled in the function structure?
Sure, this was originally intended to house any Optimized specific
state. But since this ended up being a NOP, I will change this to
follow your recommendation.
>
> > + */
> > + return 0;
> > +}
> > +
> > +static inline int core_alua_state_nonoptimized(
> > + struct se_cmd *cmd,
> > + unsigned char *cdb,
> > + int nonop_delay_msecs,
> > + u8 *alua_ascq)
> > +{
> > + /*
> > + * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
> > + * later to determine if processing of this cmd needs to be
> > + * temporarily delayed for the Active/NonOptimized primary access
> state.
> > + */
> > + cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
> > + cmd->alua_nonop_delay = nonop_delay_msecs;
> > + return 0;
> > +}
> > +
> > +static inline int core_alua_state_standby(
> > + struct se_cmd *cmd,
> > + unsigned char *cdb,
> > + u8 *alua_ascq)
> > +{
> > + /*
> > + * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
> > + * spc4r17 section 5.9.2.4.4
> > + */
> > + switch (cdb[0]) {
> > + case INQUIRY:
> > + case LOG_SELECT:
> > + case LOG_SENSE:
> > + case MODE_SELECT:
> > + case MODE_SENSE:
> > + case REPORT_LUNS:
> > + case RECEIVE_DIAGNOSTIC:
> > + case SEND_DIAGNOSTIC:
> > + case 0xa3:
>
> And what is '0xa3' ?
Whoops, changed to proper MAINTENANCE_IN from:
include/scsi/scsi.h:#define MAINTENANCE_IN 0xa3
>
> > + switch (cdb[1]) {
> > + case MI_REPORT_TARGET_PGS:
> > + return 0;
> > + default:
> > + *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
> > + return 1;
> > + }
> > + case 0xa4:
Also changed this to proper MAINTENANCE_OUT from:
include/scsi/scsi.h:#define MAINTENANCE_OUT 0xa4
> > + switch (cdb[1]) {
> > + case MO_SET_TARGET_PGS:
> > + return 0;
> > + default:
> > + *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
> > + return 1;
> > + }
> > + case REQUEST_SENSE:
> > + case PERSISTENT_RESERVE_IN:
> > + case PERSISTENT_RESERVE_OUT:
> > + case READ_BUFFER:
> > + case WRITE_BUFFER:
> > + return 0;
> > + default:
> > + *alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
> > + return 1;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static inline int core_alua_state_unavailable(
> > + struct se_cmd *cmd,
> > + unsigned char *cdb,
> > + u8 *alua_ascq)
> > +{
> > + /*
> > + * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
> > + * spc4r17 section 5.9.2.4.5
> > + */
> > + switch (cdb[0]) {
> > + case INQUIRY:
> > + case REPORT_LUNS:
> > + case 0xa3:
>
> Ditto.
Fixed
> > + switch (cdb[1]) {
> > + case MI_REPORT_TARGET_PGS:
> > + return 0;
> > + default:
> > + *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
> > + return 1;
> > + }
> > + case 0xa4:
> > + switch (cdb[1]) {
> > + case MO_SET_TARGET_PGS:
> > + return 0;
> > + default:
> > + *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
> > + return 1;
> > + }
Fixed
> > + case REQUEST_SENSE:
> > + case READ_BUFFER:
> > + case WRITE_BUFFER:
> > + return 0;
> > + default:
> > + *alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
> > + return 1;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static inline int core_alua_state_transition(
> > + struct se_cmd *cmd,
> > + unsigned char *cdb,
> > + u8 *alua_ascq)
> > +{
> > + /*
> > + * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by
> > + * spc4r17 section 5.9.2.5
> > + */
> > + switch (cdb[0]) {
> > + case INQUIRY:
> > + case REPORT_LUNS:
> > + case 0xa3:
>
> Ditto.
Fixed
> > + switch (cdb[1]) {
> > + case MI_REPORT_TARGET_PGS:
> > + return 0;
> > + default:
> > + *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
> > + return 1;
> > + }
> > + case REQUEST_SENSE:
> > + case READ_BUFFER:
> > + case WRITE_BUFFER:
> > + return 0;
> > + default:
> > + *alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
> > + return 1;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +/*
> > + * Used for alua_type SPC_ALUA_PASSTHROUGH and SPC2_ALUA_DISABLED
>
> How?
Added additional reference comment here..
> > + */
> > +int core_alua_state_check_nop(
> > + struct se_cmd *cmd,
> > + unsigned char *cdb,
> > + u8 *alua_ascq)
> > +{
> > + return 0;
> > +}
> > +
> > +/*
> > + * Used for alua_type SPC3_ALUA_EMULATED
>
> How? How does the return value determine the alua_type determination?
Added additional reference comment here..
> > + */
> > +int core_alua_state_check(
> > + struct se_cmd *cmd,
> > + unsigned char *cdb,
> > + u8 *alua_ascq)
> > +{
> > + struct se_lun *lun = SE_LUN(cmd);
> > + struct se_port *port = lun->lun_sep;
> > + struct t10_alua_tg_pt_gp *tg_pt_gp;
> > + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
> > + int out_alua_state, nonop_delay_msecs;
> > +
> > + if (!(port))
> > + return 0;
> > + /*
> > + * First, check for a struct se_port specific secondary ALUA
> target port
> > + * access state: OFFLINE
> > + */
> > + if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
> > + *alua_ascq = ASCQ_04H_ALUA_OFFLINE;
> > + printk(KERN_INFO "ALUA: Got secondary offline status for local"
> > + " target port\n");
>
> Is this a normal condition? If so, should this be KERN_DEBUG?
Yes, this is a possible normal condition.
> > + *alua_ascq = ASCQ_04H_ALUA_OFFLINE;
> > + return 1;
> > + }
> > + /*
> > + * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to
> the
> > + * ALUA target port group, to obtain current ALUA access state.
> > + * Otherwise look for the underlying struct se_device association
> with
> > + * a ALUA logical unit group.
> > + */
> > + tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
> > + spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > + tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
> > + out_alua_state =
> atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
> > + nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
> > + spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > + /*
> > + * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a seperate
> conditional
> > + * statement so the complier knows explictly to check this case
> first.
> > + */
> > + if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTMIZED)
> > + return core_alua_state_optimized(cmd, cdb, alua_ascq);
>
> Which returns zero. So why not just do 'return 0; // not
> implemented.' ?
Yep, this was changed to just 'return 0' following the removal of the
NOP core_alua_state_optimized() above.
> > +
> > + switch (out_alua_state) {
> > + case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
> > + return core_alua_state_nonoptimized(cmd, cdb,
> > + nonop_delay_msecs, alua_ascq);
> > + case ALUA_ACCESS_STATE_STANDBY:
> > + return core_alua_state_standby(cmd, cdb, alua_ascq);
> > + case ALUA_ACCESS_STATE_UNAVAILABLE:
> > + return core_alua_state_unavailable(cmd, cdb, alua_ascq);
> > + case ALUA_ACCESS_STATE_TRANSITION:
> > + return core_alua_state_transition(cmd, cdb, alua_ascq);
> > + /*
> > + * OFFLINE is a secondary ALUA target port group access state,
> that is
> > + * handled above with struct
> se_port->sep_tg_pt_secondary_offline=1
> > + */
> > + case ALUA_ACCESS_STATE_OFFLINE:
> > + default:
> > + printk(KERN_ERR "Unknown ALUA access state: 0x%02x\n",
> > + out_alua_state);
> > + return -1;
> > + }
> > +
> > + return 0;
> > +}
>
> So this function returns -1 for errors, 0 if
> tg_pt_gp_alua_access_state is set
> to ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED and 1 or 0 depending on what
> the
> core_alua_state_* return?
>
> I am a bit of loss on what the return value of 1 or 0 means. It looks
> as if
> this function is doing three things depending on which state it is,
> the
> return values have different meanings. Any chance of adding a comment
> at the
> beginning of the function explaining the states?
>
>
Ok, the struct t10_alua *alua->alua_state_check() is called in
drivers/target/target_core_transport.c:transport_cmd_sequencer(). Added
comment for the 1, 0, and -1 return codes here.
> > +
> > +/*
> > + * Check implict and explict ALUA state change request.
> > + */
> > +int core_alua_check_transition(int state, int *primary)
> > +{
> > + switch (state) {
> > + case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
> > + case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
> > + case ALUA_ACCESS_STATE_STANDBY:
> > + case ALUA_ACCESS_STATE_UNAVAILABLE:
> > + /*
> > + * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
> > + * defined as primary target port asymmetric access states.
> > + */
> > + *primary = 1;
> > + break;
> > + case ALUA_ACCESS_STATE_OFFLINE:
> > + /*
> > + * OFFLINE state is defined as a secondary target port
> > + * asymmetric access state.
> > + */
> > + *primary = 0;
> > + break;
> > + default:
> > + printk(KERN_ERR "Unknown ALUA access state: 0x%02x\n", state);
> > + return -1;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +char *core_alua_dump_state(int state)
> > +{
> > + switch (state) {
> > + case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED:
> > + return "Active/Optimized";
> > + case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
> > + return "Active/NonOptimized";
> > + case ALUA_ACCESS_STATE_STANDBY:
> > + return "Standby";
> > + case ALUA_ACCESS_STATE_UNAVAILABLE:
> > + return "Unavailable";
> > + case ALUA_ACCESS_STATE_OFFLINE:
> > + return "Offline";
> > + default:
> > + return "Unknown";
> > + }
> > +
> > + return NULL;
> > +}
> > +
> > +char *core_alua_dump_status(int status)
> > +{
> > + switch (status) {
> > + case ALUA_STATUS_NONE:
> > + return "None";
> > + case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG:
> > + return "Altered by Explict STPG";
> > + case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA:
> > + return "Altered by Implict ALUA";
> > + default:
> > + return "Unknown";
> > + }
> > +
> > + return NULL;
> > +}
> > +
> > +/*
> > + * Used by fabric modules to determine when we need to delay
> processing
> > + * for the Active/NonOptimized paths..
> > + */
> > +int core_alua_check_nonop_delay(
> > + struct se_cmd *cmd)
> > +{
> > + if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
> > + return 0;
> > + if (in_interrupt())
> > + return 0;
> > + /*
> > + * The ALUA Active/NonOptimized access state delay can be disabled
> > + * in via configfs with a value of zero
> > + */
> > + if (!(cmd->alua_nonop_delay))
> > + return 0;
> > + /*
> > + * struct se_cmd->alua_nonop_delay gets set by a target port group
> > + * defined interval in core_alua_state_nonoptimized()
> > + */
> > + msleep_interruptible(cmd->alua_nonop_delay);
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(core_alua_check_nonop_delay);
>
> Why not EXPORT_SYMBOL_GPL?
I thought that using EXPORT_SYMBOL_GPL was no longer recommended..?
> > +
> > +/*
> > + * Called with tg_pt_gp->tg_pt_gp_md_mutex or
> > tg_pt_gp_mem->sep_tg_pt_md_mutex + *
> > + */
> > +int core_alua_write_tpg_metadata(
> > + const char *path,
> > + unsigned char *md_buf,
> > + u32 md_buf_len)
> > +{
> > + mm_segment_t old_fs;
> > + struct file *file;
> > + struct iovec iov[1];
> > + int flags = O_RDWR | O_CREAT | O_TRUNC, ret;
> > +
> > + memset(iov, 0, sizeof(struct iovec));
> > +
> > + file = filp_open(path, flags, 0600);
> > + if (IS_ERR(file) || !file || !file->f_dentry) {
> > + printk(KERN_ERR "filp_open(%s) for ALUA metadata failed\n",
> > + path);
> > + return -1;
>
> -ENODEV?
Fixed
> > + }
> > +
> > + iov[0].iov_base = &md_buf[0];
> > + iov[0].iov_len = md_buf_len;
> > +
> > + old_fs = get_fs();
> > + set_fs(get_ds());
> > + ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
> > + set_fs(old_fs);
> > +
> > + if (ret < 0) {
> > + printk(KERN_ERR "Error writing ALUA metadata file: %s\n", path);
> > + filp_close(file, NULL);
> > + return -1;
>
> -ENO something?
Fixed.
> > + }
> > + filp_close(file, NULL);
> > +
> > + return 0;
> > +}
> > +
> > +/*
> > + * Called with tg_pt_gp->tg_pt_gp_md_mutex held
> > + */
> > +int core_alua_update_tpg_primary_metadata(
> > + struct t10_alua_tg_pt_gp *tg_pt_gp,
> > + int primary_state,
> > + unsigned char *md_buf)
> > +{
> > + struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
> > + struct t10_wwn *wwn = &su_dev->t10_wwn;
> > + char path[512];
>
> Why 512? Why not make it a #define?
Done, added ALUA_METADATA_PATH_LEN to target_core_alua.h
>
> > + int len;
> > +
> > + memset(path, 0, 512);
> > +
> > + len = snprintf(md_buf, tg_pt_gp->tg_pt_gp_md_buf_len,
> > + "tg_pt_gp_id=%hu\n"
> > + "alua_access_state=0x%02x\n"
> > + "alua_access_status=0x%02x\n",
> > + tg_pt_gp->tg_pt_gp_id, primary_state,
> > + tg_pt_gp->tg_pt_gp_alua_access_status);
> > +
> > + snprintf(path, 512, "/var/target/alua/tpgs_%s/%s",
> > + &wwn->unit_serial[0],
> > + config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
> > +
> > + return core_alua_write_tpg_metadata(path, md_buf, len);
> > +}
> > +
> > +int core_alua_do_transition_tg_pt(
> > + struct t10_alua_tg_pt_gp *tg_pt_gp,
> > + struct se_port *l_port,
> > + struct se_node_acl *nacl,
> > + unsigned char *md_buf,
> > + int new_state,
> > + int explict)
> > +{
> > + struct se_dev_entry *se_deve;
> > + struct se_lun_acl *lacl;
> > + struct se_port *port;
> > + struct t10_alua_tg_pt_gp_member *mem;
> > + int old_state = 0;
> > + /*
> > + * Save the old primary ALUA access state, and set the current
> state
> > + * to ALUA_ACCESS_STATE_TRANSITION.
> > + */
> > + old_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
> > + atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
> > + ALUA_ACCESS_STATE_TRANSITION);
> > + tg_pt_gp->tg_pt_gp_alua_access_status = (explict) ?
> > + ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
> > + ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
> > + /*
> > + * Check for the optional ALUA primary state transition delay
> > + */
> > + if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
> > + msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
> > +
> > + spin_lock(&tg_pt_gp->tg_pt_gp_lock);
> > + list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
> > + tg_pt_gp_mem_list) {
> > + port = mem->tg_pt;
> > + /*
> > + * After an implicit target port asymmetric access state
> > + * change, a device server shall establish a unit attention
> > + * condition for the initiator port associated with every I_T
> > + * nexus with the additional sense code set to ASYMMETRIC
> > + * ACCESS STATE CHAGED.
> > + *
> > + * After an explicit target port asymmetric access state
> > + * change, a device server shall establish a unit attention
> > + * condition with the additional sense code set to ASYMMETRIC
> > + * ACCESS STATE CHANGED for the initiator port associated with
> > + * every I_T nexus other than the I_T nexus on which the SET
> > + * TARGET PORT GROUPS command
> > + */
> > + atomic_inc(&mem->tg_pt_gp_mem_ref_cnt);
> > + smp_mb__after_atomic_inc();
> > + spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
> > +
> > + spin_lock_bh(&port->sep_alua_lock);
> > + list_for_each_entry(se_deve, &port->sep_alua_list,
> > + alua_port_list) {
> > + lacl = se_deve->se_lun_acl;
> > + /*
> > + * se_deve->se_lun_acl pointer may be NULL for a
> > + * entry created without explict Node+MappedLUN ACLs
> > + */
> > + if (!(lacl))
> > + continue;
> > +
> > + if (explict &&
> > + (nacl != NULL) && (nacl == lacl->se_lun_nacl) &&
> > + (l_port != NULL) && (l_port == port))
> > + continue;
> > +
> > + core_scsi3_ua_allocate(lacl->se_lun_nacl,
> > + se_deve->mapped_lun, 0x2A,
> > + ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
>
> Don't enough about that function to know, but if it is doing a kzalloc
> or
> kmalloc with a spin_lock held, that is a no-no.
Unfortuately core_scsi3_ua_allocate() is expected to be called with a
couple of different locks being held. Because of this,
core_scsi3_ua_allocate() is always going to use:
kmem_cache_zalloc(se_ua_cache, GFP_ATOMIC);
>
> > + }
> > + spin_unlock_bh(&port->sep_alua_lock);
> > +
> > + spin_lock(&tg_pt_gp->tg_pt_gp_lock);
> > + atomic_dec(&mem->tg_pt_gp_mem_ref_cnt);
> > + smp_mb__after_atomic_dec();
> > + }
> > + spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
> > + /*
> > + * Update the ALUA metadata buf that has been allocated in
> > + * core_alua_do_port_transition(), this metadata will be written
> > + * to struct file.
> > + *
> > + * Note that there is the case where we do not want to update the
> > + * metadata when the saved metadata is being parsed in userspace
> > + * when setting the existing port access state and access status.
> > + *
> > + * Also note that the failure to write out the ALUA metadata to
> > + * struct file does NOT affect the actual ALUA transition.
> > + */
> > + if (tg_pt_gp->tg_pt_gp_write_metadata) {
> > + mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
> > + core_alua_update_tpg_primary_metadata(tg_pt_gp,
> > + new_state, md_buf);
> > + mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
> > + }
> > + /*
> > + * Set the current primary ALUA access state to the requested new
> state
> > + */
> > + atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state, new_state);
> > +
> > + printk(KERN_INFO "Successful %s ALUA transition TG PT Group: %s
> ID: %hu"
> > + " from primary access state %s to %s\n", (explict) ? "explict" :
> > + "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
> > + tg_pt_gp->tg_pt_gp_id, core_alua_dump_state(old_state),
> > + core_alua_dump_state(new_state));
> > +
> > + return 0;
> > +}
> > +
> > +int core_alua_do_port_transition(
> > + struct t10_alua_tg_pt_gp *l_tg_pt_gp,
> > + struct se_device *l_dev,
> > + struct se_port *l_port,
> > + struct se_node_acl *l_nacl,
> > + int new_state,
> > + int explict)
> > +{
> > + struct se_device *dev;
> > + struct se_port *port;
> > + struct se_subsystem_dev *su_dev;
> > + struct se_node_acl *nacl;
> > + struct t10_alua_lu_gp *lu_gp;
> > + struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
> > + struct t10_alua_tg_pt_gp *tg_pt_gp;
> > + unsigned char *md_buf;
> > + int primary;
> > +
> > + if (core_alua_check_transition(new_state, &primary) != 0)
> > + return -1;
> > +
Changed this to -EINVAL.
> > + md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL);
> > + if (!(md_buf)) {
> > + printk("Unable to allocate buf for ALUA metadata\n");
> > + return -1;
>
> -ENOMEM?
Fixed
>
> > + }
> > +
> > + local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
> > + spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
> > + lu_gp = local_lu_gp_mem->lu_gp;
> > + atomic_inc(&lu_gp->lu_gp_ref_cnt);
> > + smp_mb__after_atomic_inc();
> > + spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
> > + /*
> > + * For storage objects that are members of the 'default_lu_gp',
> > + * we only do transition on the passed *l_tp_pt_gp, and not
> > + * on all of the matching target port groups IDs in default_lu_gp.
> > + */
> > + if (!(lu_gp->lu_gp_id)) {
> > + /*
> > + * core_alua_do_transition_tg_pt() will always return
> > + * success.
> > + */
> > + core_alua_do_transition_tg_pt(l_tg_pt_gp, l_port, l_nacl,
> > + md_buf, new_state, explict);
> > + atomic_dec(&lu_gp->lu_gp_ref_cnt);
> > + smp_mb__after_atomic_dec();
> > + kfree(md_buf);
> > + return 0;
> > + }
> > + /*
> > + * For all other LU groups aside from 'default_lu_gp', walk all of
> > + * the associated storage objects looking for a matching target
> port
> > + * group ID from the local target port group.
> > + */
> > + spin_lock(&lu_gp->lu_gp_lock);
> > + list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
> > + lu_gp_mem_list) {
> > +
> > + dev = lu_gp_mem->lu_gp_mem_dev;
> > + su_dev = dev->se_sub_dev;
> > + atomic_inc(&lu_gp_mem->lu_gp_mem_ref_cnt);
> > + smp_mb__after_atomic_inc();
> > + spin_unlock(&lu_gp->lu_gp_lock);
> > +
> > + spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > + list_for_each_entry(tg_pt_gp,
> > + &T10_ALUA(su_dev)->tg_pt_gps_list,
> > + tg_pt_gp_list) {
> > +
> > + if (!(tg_pt_gp->tg_pt_gp_valid_id))
> > + continue;
> > + /*
> > + * If the target behavior port asymmetric access state
> > + * is changed for any target port group accessiable via
> > + * a logical unit within a LU group, the target port
> > + * behavior group asymmetric access states for the same
> > + * target port group accessible via other logical units
> > + * in that LU group will also change.
> > + */
> > + if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
> > + continue;
> > +
> > + if (l_tg_pt_gp == tg_pt_gp) {
> > + port = l_port;
> > + nacl = l_nacl;
> > + } else {
> > + port = NULL;
> > + nacl = NULL;
> > + }
> > + atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
> > + smp_mb__after_atomic_inc();
> > + spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > + /*
> > + * core_alua_do_transition_tg_pt() will always return
> > + * success.
> > + */
> > + core_alua_do_transition_tg_pt(tg_pt_gp, port,
> > + nacl, md_buf, new_state, explict);
> > +
> > + spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > + atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
> > + smp_mb__after_atomic_dec();
> > + }
> > + spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > +
> > + spin_lock(&lu_gp->lu_gp_lock);
> > + atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt);
> > + smp_mb__after_atomic_dec();
> > + }
> > + spin_unlock(&lu_gp->lu_gp_lock);
> > +
> > + printk(KERN_INFO "Successfully processed LU Group: %s all ALUA TG
> PT"
> > + " Group IDs: %hu %s transition to primary state: %s\n",
> > + config_item_name(&lu_gp->lu_gp_group.cg_item),
> > + l_tg_pt_gp->tg_pt_gp_id, (explict) ? "explict" : "implict",
> > + core_alua_dump_state(new_state));
> > +
> > + atomic_dec(&lu_gp->lu_gp_ref_cnt);
> > + smp_mb__after_atomic_dec();
> > + kfree(md_buf);
> > + return 0;
> > +}
> > +
> > +/*
> > + * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
> > + */
> > +int core_alua_update_tpg_secondary_metadata(
> > + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
> > + struct se_port *port,
> > + unsigned char *md_buf,
> > + u32 md_buf_len)
> > +{
> > + struct se_portal_group *se_tpg = port->sep_tpg;
> > + char path[512], wwn[1024];
>
> Whoa. 1024? 512? how about some #defines for this.
> Can the WWN get that long? Or the path?
OK, using ALUA_METADATA_PATH_LEN here following the above. The WWN has
ben shorted to 256 bytes (the largest we will expect is the 224 from
iSCSI IQNs + ,t,0x$TPGT) and I went ahead and added
ALUA_SECONDARY_METADATA_WWN_LEN to target_core_alua.h
>
> > + int len;
> > +
> > + memset(path, 0, 512);
> > + memset(wwn, 0, 1024);
> > +
> > + len = snprintf(wwn, 512, "%s",
> > + TPG_TFO(se_tpg)->tpg_get_wwn(se_tpg));
> > +
> > + if (TPG_TFO(se_tpg)->tpg_get_tag != NULL)
> > + snprintf(wwn+len, 1024-len, "+%hu",
>
> Ditto. Those #defines.
Fixed
> > + TPG_TFO(se_tpg)->tpg_get_tag(se_tpg));
> > +
> > + len = snprintf(md_buf, md_buf_len, "alua_tg_pt_offline=%d\n"
> > + "alua_tg_pt_status=0x%02x\n",
> > + atomic_read(&port->sep_tg_pt_secondary_offline),
> > + port->sep_tg_pt_secondary_stat);
> > +
> > + snprintf(path, 512, "/var/target/alua/%s/%s/lun_%u",
> > + TPG_TFO(se_tpg)->get_fabric_name(), wwn,
> > + port->sep_lun->unpacked_lun);
> > +
> > + return core_alua_write_tpg_metadata(path, md_buf, len);
> > +}
> > +
> > +int core_alua_set_tg_pt_secondary_state(
> > + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
> > + struct se_port *port,
> > + int explict,
> > + int offline)
> > +{
> > + struct t10_alua_tg_pt_gp *tg_pt_gp;
> > + unsigned char *md_buf;
> > + u32 md_buf_len;
> > + int trans_delay_msecs;
> > +
> > + spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > + tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
> > + if (!(tg_pt_gp)) {
> > + spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > + printk(KERN_ERR "Unable to complete secondary state"
> > + " transition\n");
> > + return -1;
> > + }
> > + trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
> > + /*
> > + * Set the secondary ALUA target port access state to OFFLINE
> > + * or release the previously secondary state for struct se_port
> > + */
> > + if (offline)
> > + atomic_set(&port->sep_tg_pt_secondary_offline, 1);
> > + else
> > + atomic_set(&port->sep_tg_pt_secondary_offline, 0);
> > +
> > + md_buf_len = tg_pt_gp->tg_pt_gp_md_buf_len;
> > + port->sep_tg_pt_secondary_stat = (explict) ?
> > + ALUA_STATUS_ALTERED_BY_EXPLICT_STPG :
> > + ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA;
> > +
> > + printk(KERN_INFO "Successful %s ALUA transition TG PT Group: %s
> ID: %hu"
> > + " to secondary access state: %s\n", (explict) ? "explict" :
> > + "implict", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
> > + tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
> > +
> > + spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > + /*
> > + * Do the optional transition delay after we set the secondary
> > + * ALUA access state.
> > + */
> > + if (trans_delay_msecs != 0)
> > + msleep_interruptible(trans_delay_msecs);
> > + /*
> > + * See if we need to update the ALUA fabric port metadata for
> > + * secondary state and status
> > + */
> > + if (port->sep_tg_pt_secondary_write_md) {
> > + md_buf = kzalloc(md_buf_len, GFP_KERNEL);
> > + if (!(md_buf)) {
> > + printk(KERN_ERR "Unable to allocate md_buf for"
> > + " secondary ALUA access metadata\n");
> > + return -1;
> > + }
> > + mutex_lock(&port->sep_tg_pt_md_mutex);
> > + core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port,
> > + md_buf, md_buf_len);
> > + mutex_unlock(&port->sep_tg_pt_md_mutex);
> > +
> > + kfree(md_buf);
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +struct t10_alua_lu_gp *core_alua_allocate_lu_gp(const char *name,
> int
> > def_group) +{
> > + struct t10_alua_lu_gp *lu_gp;
> > +
> > + lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
> > + if (!(lu_gp)) {
> > + printk(KERN_ERR "Unable to allocate struct t10_alua_lu_gp\n");
> > + return NULL;
> > + }
> > + INIT_LIST_HEAD(&lu_gp->lu_gp_list);
> > + INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
> > + spin_lock_init(&lu_gp->lu_gp_lock);
> > + atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
> > +
> > + if (def_group) {
> > + lu_gp->lu_gp_id = se_global->alua_lu_gps_counter++;;
> > + lu_gp->lu_gp_valid_id = 1;
> > + se_global->alua_lu_gps_count++;
> > + }
> > +
> > + return lu_gp;
> > +}
> > +
> > +int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16
> lu_gp_id)
> > +{
> > + struct t10_alua_lu_gp *lu_gp_tmp;
> > + u16 lu_gp_id_tmp;
> > + /*
> > + * The lu_gp->lu_gp_id may only be set once..
> > + */
> > + if (lu_gp->lu_gp_valid_id) {
> > + printk(KERN_ERR "ALUA LU Group already has a valid ID,"
> > + " ignoring request\n");
>
> That looks to be in WARNING category.
Fixed
> > + return -1;
> > + }
> > +
> > + spin_lock(&se_global->lu_gps_lock);
> > + if (se_global->alua_lu_gps_count == 0x0000ffff) {
> > + printk(KERN_ERR "Maximum ALUA se_global->alua_lu_gps_count:"
> > + " 0x0000ffff reached\n");
> > + spin_unlock(&se_global->lu_gps_lock);
> > + kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
> > + return -1;
> > + }
> > +again:
> > + lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
> > + se_global->alua_lu_gps_counter++;
> > +
> > + list_for_each_entry(lu_gp_tmp, &se_global->g_lu_gps_list,
> lu_gp_list) {
> > + if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
> > + if (!(lu_gp_id))
> > + goto again;
> > +
> > + printk(KERN_ERR "ALUA Logical Unit Group ID: %hu"
> > + " already exists, ignoring request\n",
> > + lu_gp_id);
>
> KERN_WARNING.
Fixed
> > + spin_unlock(&se_global->lu_gps_lock);
> > + return -1;
> > + }
> > + }
> > +
> > + lu_gp->lu_gp_id = lu_gp_id_tmp;
> > + lu_gp->lu_gp_valid_id = 1;
> > + list_add_tail(&lu_gp->lu_gp_list, &se_global->g_lu_gps_list);
> > + se_global->alua_lu_gps_count++;
> > + spin_unlock(&se_global->lu_gps_lock);
> > +
> > + return 0;
> > +}
> > +
> > +struct t10_alua_lu_gp_member *core_alua_allocate_lu_gp_mem(
> > + struct se_device *dev)
> > +{
> > + struct t10_alua_lu_gp_member *lu_gp_mem;
> > +
> > + lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache,
> GFP_KERNEL);
> > + if (!(lu_gp_mem)) {
> > + printk(KERN_ERR "Unable to allocate struct t10_alua_lu_gp_member
> \n");
> > + return ERR_PTR(-ENOMEM);
>
> Aaah, so if you are using this here, can you use the same return for
> all the
> other functions in which you do 'return NULL' ?
<nod> So the only other place that this would be useful is
core_alua_allocate_lu_gp(). Changed to use ERR_PTR(-ENOMEM), and
updated it's usage in target_core_configfs.c
> > + }
> > + INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
> > + spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
> > + atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
> > +
> > + lu_gp_mem->lu_gp_mem_dev = dev;
> > + dev->dev_alua_lu_gp_mem = lu_gp_mem;
> > +
> > + return lu_gp_mem;
> > +}
> > +
> > +void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
> > +{
> > + struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
> > + /*
> > + * Once we have reached this point, config_item_put() has
> > + * already been called from target_core_alua_drop_lu_gp().
> > + *
> > + * Here, we remove the *lu_gp from the global list so that
> > + * no associations can be made while we are releasing
> > + * struct t10_alua_lu_gp.
> > + */
> > + spin_lock(&se_global->lu_gps_lock);
> > + atomic_set(&lu_gp->lu_gp_shutdown, 1);
> > + list_del(&lu_gp->lu_gp_list);
> > + se_global->alua_lu_gps_count--;
> > + spin_unlock(&se_global->lu_gps_lock);
> > + /*
> > + * Allow struct t10_alua_lu_gp * referenced by
> > core_alua_get_lu_gp_by_name() + * in
> > target_core_configfs.c:target_core_store_alua_lu_gp() to be + *
> released
> > with core_alua_put_lu_gp_from_name()
> > + */
> > + while (atomic_read(&lu_gp->lu_gp_ref_cnt))
> > + msleep(10);
>
> Use cpu_relax(); instead.
Fixed..
>
> > + /*
> > + * Release reference to struct t10_alua_lu_gp * from all
> associated
> > + * struct se_device.
> > + */
> > + spin_lock(&lu_gp->lu_gp_lock);
> > + list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
> > + &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
> > + if (lu_gp_mem->lu_gp_assoc) {
> > + list_del(&lu_gp_mem->lu_gp_mem_list);
> > + lu_gp->lu_gp_members--;
> > + lu_gp_mem->lu_gp_assoc = 0;
> > + }
> > + spin_unlock(&lu_gp->lu_gp_lock);
> > + /*
> > + *
> > + * lu_gp_mem is assoicated with a single
> > + * struct se_device->dev_alua_lu_gp_mem, and is released when
> > + * struct se_device is released via core_alua_free_lu_gp_mem().
> > + *
> > + * If the passed lu_gp does NOT match the default_lu_gp, assume
> > + * we want to re-assocate a given lu_gp_mem with default_lu_gp.
> > + */
> > + spin_lock(&lu_gp_mem->lu_gp_mem_lock);
> > + if (lu_gp != se_global->default_lu_gp)
> > + __core_alua_attach_lu_gp_mem(lu_gp_mem,
> > + se_global->default_lu_gp);
> > + else
> > + lu_gp_mem->lu_gp = NULL;
> > + spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
> > +
> > + spin_lock(&lu_gp->lu_gp_lock);
> > + }
> > + spin_unlock(&lu_gp->lu_gp_lock);
> > +
> > + kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
> > +}
> > +
> > +void core_alua_free_lu_gp_mem(struct se_device *dev)
> > +{
> > + struct se_subsystem_dev *su_dev = dev->se_sub_dev;
> > + struct t10_alua *alua = T10_ALUA(su_dev);
> > + struct t10_alua_lu_gp *lu_gp;
> > + struct t10_alua_lu_gp_member *lu_gp_mem;
> > +
> > + if (alua->alua_type != SPC3_ALUA_EMULATED)
> > + return;
> > +
> > + lu_gp_mem = dev->dev_alua_lu_gp_mem;
> > + if (!(lu_gp_mem))
> > + return;
> > +
> > + while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
> > + msleep(10);
>
> cpu_relax();
Fixed
> > +
> > + spin_lock(&lu_gp_mem->lu_gp_mem_lock);
> > + lu_gp = lu_gp_mem->lu_gp;
> > + if ((lu_gp)) {
> > + spin_lock(&lu_gp->lu_gp_lock);
> > + if (lu_gp_mem->lu_gp_assoc) {
> > + list_del(&lu_gp_mem->lu_gp_mem_list);
> > + lu_gp->lu_gp_members--;
> > + lu_gp_mem->lu_gp_assoc = 0;
> > + }
> > + spin_unlock(&lu_gp->lu_gp_lock);
> > + lu_gp_mem->lu_gp = NULL;
> > + }
> > + spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
> > +
> > + kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
> > +}
> > +
> > +struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char
> *name)
> > +{
> > + struct t10_alua_lu_gp *lu_gp;
> > + struct config_item *ci;
> > +
> > + spin_lock(&se_global->lu_gps_lock);
> > + list_for_each_entry(lu_gp, &se_global->g_lu_gps_list, lu_gp_list)
> {
> > + if (!(lu_gp->lu_gp_valid_id))
> > + continue;
> > + ci = &lu_gp->lu_gp_group.cg_item;
> > + if (!(strcmp(config_item_name(ci), name))) {
> > + atomic_inc(&lu_gp->lu_gp_ref_cnt);
> > + spin_unlock(&se_global->lu_gps_lock);
> > + return lu_gp;
> > + }
> > + }
> > + spin_unlock(&se_global->lu_gps_lock);
> > +
> > + return NULL;
> > +}
> > +
> > +void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
> > +{
> > + spin_lock(&se_global->lu_gps_lock);
> > + atomic_dec(&lu_gp->lu_gp_ref_cnt);
> > + spin_unlock(&se_global->lu_gps_lock);
> > +}
> > +
> > +/*
> > + * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
> > + */
> > +void __core_alua_attach_lu_gp_mem(
> > + struct t10_alua_lu_gp_member *lu_gp_mem,
> > + struct t10_alua_lu_gp *lu_gp)
> > +{
> > + spin_lock(&lu_gp->lu_gp_lock);
> > + lu_gp_mem->lu_gp = lu_gp;
> > + lu_gp_mem->lu_gp_assoc = 1;
>
> Put a comment explaining what '1' stands for.
This is actually the 'association bit'. Changing this to a bitfield
now.
>
> > + list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
> > + lu_gp->lu_gp_members++;
> > + spin_unlock(&lu_gp->lu_gp_lock);
> > +}
> > +
> > +/*
> > + * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
> > + */
> > +void __core_alua_drop_lu_gp_mem(
> > + struct t10_alua_lu_gp_member *lu_gp_mem,
> > + struct t10_alua_lu_gp *lu_gp)
> > +{
> > + spin_lock(&lu_gp->lu_gp_lock);
> > + list_del(&lu_gp_mem->lu_gp_mem_list);
> > + lu_gp_mem->lu_gp = NULL;
> > + lu_gp_mem->lu_gp_assoc = 0;
> > + lu_gp->lu_gp_members--;
> > + spin_unlock(&lu_gp->lu_gp_lock);
> > +}
> > +
> > +struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(
> > + struct se_subsystem_dev *su_dev,
> > + const char *name,
> > + int def_group)
> > +{
> > + struct t10_alua_tg_pt_gp *tg_pt_gp;
> > +
> > + tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
> > + if (!(tg_pt_gp)) {
> > + printk(KERN_ERR "Unable to allocate struct t10_alua_tg_pt_gp\n");
> > + return NULL;
> > + }
> > + INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
> > + INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
> > + mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
> > + spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
> > + atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
> > + tg_pt_gp->tg_pt_gp_su_dev = su_dev;
> > + tg_pt_gp->tg_pt_gp_md_buf_len = ALUA_MD_BUF_LEN;
> > + atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
> > + ALUA_ACCESS_STATE_ACTIVE_OPTMIZED);
> > + /*
> > + * Enable both explict and implict ALUA support by default
> > + */
> > + tg_pt_gp->tg_pt_gp_alua_access_type =
> > + TPGS_EXPLICT_ALUA | TPGS_IMPLICT_ALUA;
> > + /*
> > + * Set the default Active/NonOptimized Delay in milliseconds
> > + */
> > + tg_pt_gp->tg_pt_gp_nonop_delay_msecs =
> ALUA_DEFAULT_NONOP_DELAY_MSECS;
> > + tg_pt_gp->tg_pt_gp_trans_delay_msecs =
> ALUA_DEFAULT_TRANS_DELAY_MSECS;
> > +
> > + if (def_group) {
> > + spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > + tg_pt_gp->tg_pt_gp_id =
> > + T10_ALUA(su_dev)->alua_tg_pt_gps_counter++;
> > + tg_pt_gp->tg_pt_gp_valid_id = 1;
> > + T10_ALUA(su_dev)->alua_tg_pt_gps_count++;
> > + list_add_tail(&tg_pt_gp->tg_pt_gp_list,
> > + &T10_ALUA(su_dev)->tg_pt_gps_list);
> > + spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > + }
> > +
> > + return tg_pt_gp;
> > +}
> > +
> > +int core_alua_set_tg_pt_gp_id(
> > + struct t10_alua_tg_pt_gp *tg_pt_gp,
> > + u16 tg_pt_gp_id)
> > +{
> > + struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
> > + struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
> > + u16 tg_pt_gp_id_tmp;
> > + /*
> > + * The tg_pt_gp->tg_pt_gp_id may only be set once..
> > + */
> > + if (tg_pt_gp->tg_pt_gp_valid_id) {
> > + printk(KERN_ERR "ALUA TG PT Group already has a valid ID,"
> > + " ignoring request\n");
>
> KERN_WARNING?
Fixed
> > + return -1;
> > + }
> > +
> > + spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > + if (T10_ALUA(su_dev)->alua_tg_pt_gps_count == 0x0000ffff) {
> > + printk(KERN_ERR "Maximum ALUA alua_tg_pt_gps_count:"
> > + " 0x0000ffff reached\n");
> > + spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > + kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
> > + return -1;
> > + }
> > +again:
> > + tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
> > + T10_ALUA(su_dev)->alua_tg_pt_gps_counter++;
> > +
> > + list_for_each_entry(tg_pt_gp_tmp,
> &T10_ALUA(su_dev)->tg_pt_gps_list,
> > + tg_pt_gp_list) {
> > + if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
> > + if (!(tg_pt_gp_id))
> > + goto again;
> > +
> > + printk(KERN_ERR "ALUA Target Port Group ID: %hu already"
> > + " exists, ignoring request\n", tg_pt_gp_id);
> > + spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > + return -1;
> > + }
> > + }
> > +
> > + tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
> > + tg_pt_gp->tg_pt_gp_valid_id = 1;
> > + list_add_tail(&tg_pt_gp->tg_pt_gp_list,
> > + &T10_ALUA(su_dev)->tg_pt_gps_list);
> > + T10_ALUA(su_dev)->alua_tg_pt_gps_count++;
> > + spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > +
>
> This function looks similar to "core_alua_set_lu_gp_id". Any way to
> unify
> it/share?
Unfortuately I think unifying "core_alua_set_lu_gp_id() and
core_alua_set_tg_pt_gp_id() would not be worth the trouble..
> > + return 0;
> > +}
> > +
> > +struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
> > + struct se_port *port)
> > +{
> > + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
> > +
> > + tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
> > + GFP_KERNEL);
> > + if (!(tg_pt_gp_mem)) {
> > + printk(KERN_ERR "Unable to allocate struct
> t10_alua_tg_pt_gp_member\n");
> > + return ERR_PTR(-ENOMEM);
> > + }
> > + INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
> > + spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > + atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
> > +
> > + tg_pt_gp_mem->tg_pt = port;
> > + port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
> > + atomic_set(&port->sep_tg_pt_gp_active, 1);
> > +
> > + return tg_pt_gp_mem;
> > +}
> > +
> > +void core_alua_free_tg_pt_gp(
> > + struct t10_alua_tg_pt_gp *tg_pt_gp)
> > +{
> > + struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
> > + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
> > + /*
> > + * Once we have reached this point, config_item_put() has already
> > + * been called from target_core_alua_drop_tg_pt_gp().
> > + *
> > + * Here we remove *tg_pt_gp from the global list so that
> > + * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS
> > + * can be made while we are releasing struct t10_alua_tg_pt_gp.
> > + */
> > + spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > + list_del(&tg_pt_gp->tg_pt_gp_list);
> > + T10_ALUA(su_dev)->alua_tg_pt_gps_counter--;
> > + spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > + /*
> > + * Allow a struct t10_alua_tg_pt_gp_member * referenced by
> > + * core_alua_get_tg_pt_gp_by_name() in
> > + * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
> > + * to be released with core_alua_put_tg_pt_gp_from_name().
> > + */
> > + while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
> > + msleep(10);
>
> cpu_relax();
Fixed
> > + /*
> > + * Release reference to struct t10_alua_tg_pt_gp from all
> associated
> > + * struct se_port.
> > + */
> > + spin_lock(&tg_pt_gp->tg_pt_gp_lock);
> > + list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
> > + &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
> > + if (tg_pt_gp_mem->tg_pt_gp_assoc) {
> > + list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
> > + tg_pt_gp->tg_pt_gp_members--;
> > + tg_pt_gp_mem->tg_pt_gp_assoc = 0;
> > + }
> > + spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
> > + /*
> > + * tg_pt_gp_mem is assoicated with a single
> > + * se_port->sep_alua_tg_pt_gp_mem, and is released via
> > + * core_alua_free_tg_pt_gp_mem().
> > + *
> > + * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
> > + * assume we want to re-assocate a given tg_pt_gp_mem with
> > + * default_tg_pt_gp.
> > + */
> > + spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > + if (tg_pt_gp != T10_ALUA(su_dev)->default_tg_pt_gp) {
> > + __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
> > + T10_ALUA(su_dev)->default_tg_pt_gp);
> > + } else
> > + tg_pt_gp_mem->tg_pt_gp = NULL;
> > + spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > +
> > + spin_lock(&tg_pt_gp->tg_pt_gp_lock);
> > + }
> > + spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
> > +
> > + kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
>
> Hmm, this function looks familiar too. There was another one that did
> almost
> the same thing - any way of collapsing them in one?
Same point here. I don't think it would be worth the effort to unify
ore_alua_free_lu_gp() core_alua_free_tg_pt_gp().
> > +}
> > +
> > +void core_alua_free_tg_pt_gp_mem(struct se_port *port)
> > +{
> > + struct se_subsystem_dev *su_dev =
> port->sep_lun->lun_se_dev->se_sub_dev;
> > + struct t10_alua *alua = T10_ALUA(su_dev);
> > + struct t10_alua_tg_pt_gp *tg_pt_gp;
> > + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
> > +
> > + if (alua->alua_type != SPC3_ALUA_EMULATED)
> > + return;
> > +
> > + tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
> > + if (!(tg_pt_gp_mem))
> > + return;
> > +
> > + while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
> > + msleep(10);
> > +
>
> cpu_relax()
Fixed
> > + spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > + tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
> > + if ((tg_pt_gp)) {
> > + spin_lock(&tg_pt_gp->tg_pt_gp_lock);
> > + if (tg_pt_gp_mem->tg_pt_gp_assoc) {
> > + list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
> > + tg_pt_gp->tg_pt_gp_members--;
> > + tg_pt_gp_mem->tg_pt_gp_assoc = 0;
> > + }
> > + spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
> > + tg_pt_gp_mem->tg_pt_gp = NULL;
> > + }
> > + spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > +
> > + kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
> > +}
> > +
> > +struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
> > + struct se_subsystem_dev *su_dev,
> > + const char *name)
> > +{
> > + struct t10_alua_tg_pt_gp *tg_pt_gp;
> > + struct config_item *ci;
> > +
> > + spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > + list_for_each_entry(tg_pt_gp, &T10_ALUA(su_dev)->tg_pt_gps_list,
> > + tg_pt_gp_list) {
> > + if (!(tg_pt_gp->tg_pt_gp_valid_id))
> > + continue;
> > + ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
> > + if (!(strcmp(config_item_name(ci), name))) {
> > + atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
> > + spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > + return tg_pt_gp;
> > + }
> > + }
> > + spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > +
> > + return NULL;
> > +}
> > +
> > +void core_alua_put_tg_pt_gp_from_name(
> > + struct t10_alua_tg_pt_gp *tg_pt_gp)
> > +{
> > + struct se_subsystem_dev *su_dev = tg_pt_gp->tg_pt_gp_su_dev;
> > +
> > + spin_lock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > + atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
> > + spin_unlock(&T10_ALUA(su_dev)->tg_pt_gps_lock);
> > +}
> > +
> > +/*
> > + * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock
> held
> > + */
> > +void __core_alua_attach_tg_pt_gp_mem(
> > + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
> > + struct t10_alua_tg_pt_gp *tg_pt_gp)
> > +{
> > + spin_lock(&tg_pt_gp->tg_pt_gp_lock);
> > + tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
> > + tg_pt_gp_mem->tg_pt_gp_assoc = 1;
> > + list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
> > + &tg_pt_gp->tg_pt_gp_mem_list);
> > + tg_pt_gp->tg_pt_gp_members++;
> > + spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
> > +}
> > +
> > +/*
> > + * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock
> held
> > + */
> > +void __core_alua_drop_tg_pt_gp_mem(
> > + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
> > + struct t10_alua_tg_pt_gp *tg_pt_gp)
> > +{
> > + spin_lock(&tg_pt_gp->tg_pt_gp_lock);
> > + list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
> > + tg_pt_gp_mem->tg_pt_gp = NULL;
> > + tg_pt_gp_mem->tg_pt_gp_assoc = 0;
> > + tg_pt_gp->tg_pt_gp_members--;
> > + spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
> > +}
> > +
> > +ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char
> *page)
> > +{
> > + struct se_subsystem_dev *su_dev =
> port->sep_lun->lun_se_dev->se_sub_dev;
> > + struct config_item *tg_pt_ci;
> > + struct t10_alua *alua = T10_ALUA(su_dev);
> > + struct t10_alua_tg_pt_gp *tg_pt_gp;
> > + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
> > + ssize_t len = 0;
> > +
> > + if (alua->alua_type != SPC3_ALUA_EMULATED)
> > + return len;
> > +
> > + tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
> > + if (!(tg_pt_gp_mem))
> > + return len;
> > +
> > + spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > + tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
> > + if ((tg_pt_gp)) {
> > + tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
> > + len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
> > + " %hu\nTG Port Primary Access State: %s\nTG Port "
> > + "Primary Access Status: %s\nTG Port Secondary Access"
> > + " State: %s\nTG Port Secondary Access Status: %s\n",
> > + config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
> > + core_alua_dump_state(atomic_read(
> > + &tg_pt_gp->tg_pt_gp_alua_access_state)),
> > + core_alua_dump_status(
> > + tg_pt_gp->tg_pt_gp_alua_access_status),
> > + (atomic_read(&port->sep_tg_pt_secondary_offline)) ?
> > + "Offline" : "None",
> > + core_alua_dump_status(port->sep_tg_pt_secondary_stat));
> > + }
> > + spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > +
> > + return len;
> > +}
> > +EXPORT_SYMBOL(core_alua_show_tg_pt_gp_info);
>
> Why not EXPORT_SYMBOL_GPL?
No particular reason here..
> > +
> > +ssize_t core_alua_store_tg_pt_gp_info(
> > + struct se_port *port,
> > + const char *page,
> > + size_t count)
> > +{
> > + struct se_portal_group *tpg;
> > + struct se_lun *lun;
> > + struct se_subsystem_dev *su_dev =
> port->sep_lun->lun_se_dev->se_sub_dev;
> > + struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
> > + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
> > + unsigned char buf[TG_PT_GROUP_NAME_BUF];
> > + int move = 0;
> > +
> > + tpg = port->sep_tpg;
> > + lun = port->sep_lun;
> > +
> > + if (T10_ALUA(su_dev)->alua_type != SPC3_ALUA_EMULATED) {
> > + printk(KERN_WARNING "SPC3_ALUA_EMULATED not enabled for"
> > + " %s/tpgt_%hu/%s\n", TPG_TFO(tpg)->tpg_get_wwn(tpg),
> > + TPG_TFO(tpg)->tpg_get_tag(tpg),
> > + config_item_name(&lun->lun_group.cg_item));
> > + return -EINVAL;
> > + }
> > +
> > + if (count > TG_PT_GROUP_NAME_BUF) {
> > + printk(KERN_ERR "ALUA Target Port Group alias too large!\n");
> > + return -EINVAL;
> > + }
> > + memset(buf, 0, TG_PT_GROUP_NAME_BUF);
> > + memcpy(buf, page, count);
> > + /*
> > + * Any ALUA target port group alias besides "NULL" means we will
> be
> > + * making a new group association.
> > + */
> > + if (strcmp(strstrip(buf), "NULL")) {
> > + /*
> > + * core_alua_get_tg_pt_gp_by_name() will increment reference to
> > + * struct t10_alua_tg_pt_gp. This reference is released with
> > + * core_alua_put_tg_pt_gp_from_name() below.
> > + */
> > + tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(su_dev,
> > + strstrip(buf));
> > + if (!(tg_pt_gp_new))
> > + return -ENODEV;
> > + }
> > + tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
> > + if (!(tg_pt_gp_mem)) {
> > + if (tg_pt_gp_new)
> > + core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
> > + printk(KERN_ERR "NULL struct se_port->sep_alua_tg_pt_gp_mem
> pointer\n");
> > + return -EINVAL;
> > + }
> > +
> > + spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > + tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
> > + if ((tg_pt_gp)) {
> > + /*
> > + * Clearing an existing tg_pt_gp association, and replacing
> > + * with the default_tg_pt_gp.
> > + */
> > + if (!(tg_pt_gp_new)) {
> > + printk(KERN_INFO "Target_Core_ConfigFS: Moving"
> > + " %s/tpgt_%hu/%s from ALUA Target Port Group:"
> > + " alua/%s, ID: %hu back to"
> > + " default_tg_pt_gp\n",
> > + TPG_TFO(tpg)->tpg_get_wwn(tpg),
> > + TPG_TFO(tpg)->tpg_get_tag(tpg),
> > + config_item_name(&lun->lun_group.cg_item),
> > + config_item_name(
> > + &tg_pt_gp->tg_pt_gp_group.cg_item),
> > + tg_pt_gp->tg_pt_gp_id);
> > +
> > + __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
> > + __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
> > + T10_ALUA(su_dev)->default_tg_pt_gp);
> > + spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > +
> > + return count;
> > + }
> > + /*
> > + * Removing existing association of tg_pt_gp_mem with tg_pt_gp
> > + */
> > + __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
> > + move = 1;
> > + }
> > + /*
> > + * Associate tg_pt_gp_mem with tg_pt_gp_new.
> > + */
> > + __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
> > + spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
> > + printk("Target_Core_ConfigFS: %s %s/tpgt_%hu %s to ALUA Target
> Port"
>
> And this is KERN_INFO?
Fixed
>
> > + " Group: alua/%s, ID: %hu\n", (move) ?
> > + "Moving" : "Adding", TPG_TFO(tpg)->tpg_get_wwn(tpg),
> > + TPG_TFO(tpg)->tpg_get_tag(tpg),
> > + config_item_name(&lun->lun_group.cg_item),
> > + config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
> > + tg_pt_gp_new->tg_pt_gp_id);
> > +
> > + core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
> > + return count;
> > +}
> > +EXPORT_SYMBOL(core_alua_store_tg_pt_gp_info);
>
> Why not EXPORT_SYMBOL_GPL?
No particular reason..
> > +
> > +ssize_t core_alua_show_access_type(
> > + struct t10_alua_tg_pt_gp *tg_pt_gp,
> > + char *page)
> > +{
> > + if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA) &&
> > + (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA))
> > + return sprintf(page, "Implict and Explict\n");
> > + else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICT_ALUA)
> > + return sprintf(page, "Implict\n");
> > + else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICT_ALUA)
> > + return sprintf(page, "Explict\n");
> > + else
> > + return sprintf(page, "None\n");
> > +}
> > +
> > +ssize_t core_alua_store_access_type(
> > + struct t10_alua_tg_pt_gp *tg_pt_gp,
> > + const char *page,
> > + size_t count)
> > +{
> > + unsigned long tmp;
> > + int ret;
> > +
> > + ret = strict_strtoul(page, 0, &tmp);
> > + if (ret < 0) {
> > + printk(KERN_ERR "Unable to extract alua_access_type\n");
> > + return -EINVAL;
> > + }
> > + if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
> > + printk(KERN_ERR "Illegal value for alua_access_type:"
> > + " %lu\n", tmp);
> > + return -EINVAL;
> > + }
> > + if (tmp == 3)
> > + tg_pt_gp->tg_pt_gp_alua_access_type =
> > + TPGS_IMPLICT_ALUA | TPGS_EXPLICT_ALUA;
> > + else if (tmp == 2)
> > + tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICT_ALUA;
> > + else if (tmp == 1)
> > + tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICT_ALUA;
> > + else
> > + tg_pt_gp->tg_pt_gp_alua_access_type = 0;
> > +
> > + return count;
> > +}
> > +
> > +ssize_t core_alua_show_nonop_delay_msecs(
> > + struct t10_alua_tg_pt_gp *tg_pt_gp,
> > + char *page)
> > +{
> > + return sprintf(page, "%d\n",
> tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
> > +}
> > +
> > +ssize_t core_alua_store_nonop_delay_msecs(
> > + struct t10_alua_tg_pt_gp *tg_pt_gp,
> > + const char *page,
> > + size_t count)
> > +{
> > + unsigned long tmp;
> > + int ret;
> > +
> > + ret = strict_strtoul(page, 0, &tmp);
> > + if (ret < 0) {
> > + printk(KERN_ERR "Unable to extract nonop_delay_msecs\n");
> > + return -EINVAL;
> > + }
> > + if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
> > + printk(KERN_ERR "Passed nonop_delay_msecs: %lu, exceeds"
> > + " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
> > + ALUA_MAX_NONOP_DELAY_MSECS);
> > + return -EINVAL;
> > + }
> > + tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
> > +
> > + return count;
> > +}
> > +
> > +ssize_t core_alua_show_trans_delay_msecs(
> > + struct t10_alua_tg_pt_gp *tg_pt_gp,
> > + char *page)
> > +{
> > + return sprintf(page, "%d\n",
> tg_pt_gp->tg_pt_gp_trans_delay_msecs);
> > +}
> > +
> > +ssize_t core_alua_store_trans_delay_msecs(
> > + struct t10_alua_tg_pt_gp *tg_pt_gp,
> > + const char *page,
> > + size_t count)
> > +{
> > + unsigned long tmp;
> > + int ret;
> > +
> > + ret = strict_strtoul(page, 0, &tmp);
> > + if (ret < 0) {
> > + printk(KERN_ERR "Unable to extract trans_delay_msecs\n");
> > + return -EINVAL;
> > + }
> > + if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
> > + printk(KERN_ERR "Passed trans_delay_msecs: %lu, exceeds"
> > + " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
> > + ALUA_MAX_TRANS_DELAY_MSECS);
> > + return -EINVAL;
> > + }
> > + tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
> > +
> > + return count;
> > +}
> > +
> > +ssize_t core_alua_show_preferred_bit(
> > + struct t10_alua_tg_pt_gp *tg_pt_gp,
> > + char *page)
> > +{
> > + return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
> > +}
> > +
> > +ssize_t core_alua_store_preferred_bit(
> > + struct t10_alua_tg_pt_gp *tg_pt_gp,
> > + const char *page,
> > + size_t count)
> > +{
> > + unsigned long tmp;
> > + int ret;
> > +
> > + ret = strict_strtoul(page, 0, &tmp);
> > + if (ret < 0) {
> > + printk(KERN_ERR "Unable to extract preferred ALUA value\n");
> > + return -EINVAL;
> > + }
> > + if ((tmp != 0) && (tmp != 1)) {
> > + printk(KERN_ERR "Illegal value for preferred ALUA: %lu\n", tmp);
> > + return -EINVAL;
> > + }
> > + tg_pt_gp->tg_pt_gp_pref = (int)tmp;
> > +
> > + return count;
> > +}
> > +
> > +ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
> > +{
> > + if (!(lun->lun_sep))
> > + return -ENODEV;
> > +
> > + return sprintf(page, "%d\n",
> > + atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
> > +}
> > +EXPORT_SYMBOL(core_alua_show_offline_bit);
>
> And _GPL here?
> > +
> > +ssize_t core_alua_store_offline_bit(
> > + struct se_lun *lun,
> > + const char *page,
> > + size_t count)
> > +{
> > + struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
> > + unsigned long tmp;
> > + int ret;
> > +
> > + if (!(lun->lun_sep))
> > + return -ENODEV;
> > +
> > + ret = strict_strtoul(page, 0, &tmp);
> > + if (ret < 0) {
> > + printk(KERN_ERR "Unable to extract alua_tg_pt_offline value\n");
> > + return -EINVAL;
> > + }
> > + if ((tmp != 0) && (tmp != 1)) {
> > + printk(KERN_ERR "Illegal value for alua_tg_pt_offline: %lu\n",
> > + tmp);
> > + return -EINVAL;
> > + }
> > + tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
> > + if (!(tg_pt_gp_mem)) {
> > + printk(KERN_ERR "Unable to locate *tg_pt_gp_mem\n");
> > + return -EINVAL;
> > + }
> > +
> > + ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
> > + lun->lun_sep, 0, (int)tmp);
> > + if (ret < 0)
> > + return -EINVAL;
> > +
> > + return count;
> > +}
> > +EXPORT_SYMBOL(core_alua_store_offline_bit);
>
> EXPORT_SYMBOL_GPL?
> > +
> > +ssize_t core_alua_show_secondary_status(
> > + struct se_lun *lun,
> > + char *page)
> > +{
> > + return sprintf(page, "%d\n",
> lun->lun_sep->sep_tg_pt_secondary_stat);
> > +}
> > +EXPORT_SYMBOL(core_alua_show_secondary_status);
>
> Ditto.
> > +
> > +ssize_t core_alua_store_secondary_status(
> > + struct se_lun *lun,
> > + const char *page,
> > + size_t count)
> > +{
> > + unsigned long tmp;
> > + int ret;
> > +
> > + ret = strict_strtoul(page, 0, &tmp);
> > + if (ret < 0) {
> > + printk(KERN_ERR "Unable to extract alua_tg_pt_status\n");
> > + return -EINVAL;
> > + }
> > + if ((tmp != ALUA_STATUS_NONE) &&
> > + (tmp != ALUA_STATUS_ALTERED_BY_EXPLICT_STPG) &&
> > + (tmp != ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA)) {
> > + printk(KERN_ERR "Illegal value for alua_tg_pt_status: %lu\n",
> > + tmp);
> > + return -EINVAL;
> > + }
> > + lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
> > +
> > + return count;
> > +}
> > +EXPORT_SYMBOL(core_alua_store_secondary_status);
>
> Ditto.h
> > +
> > +ssize_t core_alua_show_secondary_write_metadata(
> > + struct se_lun *lun,
> > + char *page)
> > +{
> > + return sprintf(page, "%d\n",
> > + lun->lun_sep->sep_tg_pt_secondary_write_md);
> > +}
> > +EXPORT_SYMBOL(core_alua_show_secondary_write_metadata);
>
> Ditto
> > +
> > +ssize_t core_alua_store_secondary_write_metadata(
> > + struct se_lun *lun,
> > + const char *page,
> > + size_t count)
> > +{
> > + unsigned long tmp;
> > + int ret;
> > +
> > + ret = strict_strtoul(page, 0, &tmp);
> > + if (ret < 0) {
> > + printk(KERN_ERR "Unable to extract alua_tg_pt_write_md\n");
> > + return -EINVAL;
> > + }
> > + if ((tmp != 0) && (tmp != 1)) {
> > + printk(KERN_ERR "Illegal value for alua_tg_pt_write_md:"
> > + " %lu\n", tmp);
> > + return -EINVAL;
> > + }
> > + lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
> > +
> > + return count;
> > +}
> > +EXPORT_SYMBOL(core_alua_store_secondary_write_metadata);
>
> Ditto
> > +
> > +int core_setup_alua(struct se_device *dev, int force_pt)
> > +{
> > + struct se_subsystem_dev *su_dev = dev->se_sub_dev;
> > + struct t10_alua *alua = T10_ALUA(su_dev);
> > + struct t10_alua_lu_gp_member *lu_gp_mem;
> > + /*
> > + * If this device is from Target_Core_Mod/pSCSI, use the ALUA
> logic
> > + * of the Underlying SCSI hardware. In Linux/SCSI terms, this can
> > + * cause a problem because libata and some SATA RAID HBAs appear
> > + * under Linux/SCSI, but emulate SCSI logic themselves.
> > + */
> > + if (((TRANSPORT(dev)->transport_type ==
> TRANSPORT_PLUGIN_PHBA_PDEV) &&
> > + !(DEV_ATTRIB(dev)->emulate_alua)) || force_pt) {
> > + alua->alua_type = SPC_ALUA_PASSTHROUGH;
> > + alua->alua_state_check = &core_alua_state_check_nop;
> > + printk(KERN_INFO "%s: Using SPC_ALUA_PASSTHROUGH, no ALUA"
> > + " emulation\n", TRANSPORT(dev)->name);
> > + return 0;
> > + }
> > + /*
> > + * If SPC-3 or above is reported by real or emulated struct
> se_device,
> > + * use emulated ALUA.
> > + */
> > + if (TRANSPORT(dev)->get_device_rev(dev) >= SCSI_3) {
> > + printk(KERN_INFO "%s: Enabling ALUA Emulation for SPC-3"
> > + " device\n", TRANSPORT(dev)->name);
> > + /*
> > + * Assoicate this struct se_device with the default ALUA
> > + * LUN Group.
> > + */
> > + lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
> > + if (IS_ERR(lu_gp_mem) || !lu_gp_mem)
> > + return -1;
> > +
> > + alua->alua_type = SPC3_ALUA_EMULATED;
> > + alua->alua_state_check = &core_alua_state_check;
> > + spin_lock(&lu_gp_mem->lu_gp_mem_lock);
> > + __core_alua_attach_lu_gp_mem(lu_gp_mem,
> > + se_global->default_lu_gp);
> > + spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
> > +
> > + printk(KERN_INFO "%s: Adding to default ALUA LU Group:"
> > + " core/alua/lu_gps/default_lu_gp\n",
> > + TRANSPORT(dev)->name);
> > + } else {
> > + alua->alua_type = SPC2_ALUA_DISABLED;
> > + alua->alua_state_check = &core_alua_state_check_nop;
> > + printk("%s: Disabling ALUA Emulation for SPC-2 device\n",
> > + TRANSPORT(dev)->name);
>
> You forgot the runlevel. I _know_ the scripts/checkpatch.pl complains
> about
> this. Do run it before you post any patches on LKML and fix them
> please.
>
Fixed
I will commit the ACKed items from above, and will go ahead replace the
other usages of msleep() in a loop to use cpu_relax() instead.
Thanks again for your astute comments Konrad!
--nab
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