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target_core_alua: Referrals infrastructure

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Add infrastructure for referrals.

v2 changes:

 - Fix unsigned long long division in core_alua_state_lba_dependent on
   32-bit  (Fengguang + Chen + Hannes)
 - Fix compile warning in core_alua_state_lba_dependent (nab)
 - Convert segment_* + sectors variables in core_alua_state_lba_dependent
   to u64 (Hannes)

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Hannes Reinecke
2013-12-17 09:18:49 +01:00
committed by Nicholas Bellinger
parent fbfe858fea
commit c66094bf32
8 changed files with 210 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/target/target_core_spc.c
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@@ -476,6 +476,11 @@ spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
/* If WriteCache emulation is enabled, set V_SUP */
if (spc_check_dev_wce(dev))
buf[6] = 0x01;
/* If an LBA map is present set R_SUP */
spin_lock(&cmd->se_dev->t10_alua.lba_map_lock);
if (!list_empty(&dev->t10_alua.lba_map_list))
buf[8] = 0x10;
spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock);
return 0;
}
@@ -634,6 +639,20 @@ spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
return 0;
}
/* Referrals VPD page */
static sense_reason_t
spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf)
{
struct se_device *dev = cmd->se_dev;
buf[0] = dev->transport->get_device_type(dev);
buf[3] = 0x0c;
put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]);
put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[12]);
return 0;
}
static sense_reason_t
spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
@@ -648,6 +667,7 @@ static struct {
{ .page = 0xb0, .emulate = spc_emulate_evpd_b0 },
{ .page = 0xb1, .emulate = spc_emulate_evpd_b1 },
{ .page = 0xb2, .emulate = spc_emulate_evpd_b2 },
{ .page = 0xb3, .emulate = spc_emulate_evpd_b3 },
};
/* supported vital product data pages */