From: Hannes Reinecke Date: Tue, 17 Dec 2013 08:18:43 +0000 (+0100) Subject: target_core_alua: validate ALUA state transition X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=bb91c1a087ed29ceb5b25b9c210c6665e13c36eb;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git target_core_alua: validate ALUA state transition As we now can modify the list of supported states we need to validate the requested ALUA state when doing a state transition. Signed-off-by: Hannes Reinecke Signed-off-by: Nicholas Bellinger --- diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c index fdcee326bfbc..292ecce98d1f 100644 --- a/drivers/target/target_core_alua.c +++ b/drivers/target/target_core_alua.c @@ -41,11 +41,14 @@ #include "target_core_alua.h" #include "target_core_ua.h" -static sense_reason_t core_alua_check_transition(int state, int *primary); +static sense_reason_t core_alua_check_transition(int state, int valid, + int *primary); static int core_alua_set_tg_pt_secondary_state( struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, struct se_port *port, int explicit, int offline); +static char *core_alua_dump_state(int state); + static u16 alua_lu_gps_counter; static u32 alua_lu_gps_count; @@ -210,7 +213,7 @@ target_emulate_set_target_port_groups(struct se_cmd *cmd) unsigned char *ptr; sense_reason_t rc = TCM_NO_SENSE; u32 len = 4; /* Skip over RESERVED area in header */ - int alua_access_state, primary = 0; + int alua_access_state, primary = 0, valid_states; u16 tg_pt_id, rtpi; if (!l_port) @@ -252,6 +255,7 @@ target_emulate_set_target_port_groups(struct se_cmd *cmd) rc = TCM_UNSUPPORTED_SCSI_OPCODE; goto out; } + valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; ptr = &buf[4]; /* Skip over RESERVED area in header */ @@ -263,7 +267,8 @@ target_emulate_set_target_port_groups(struct se_cmd *cmd) * the state is a primary or secondary target port asymmetric * access state. */ - rc = core_alua_check_transition(alua_access_state, &primary); + rc = core_alua_check_transition(alua_access_state, + valid_states, &primary); if (rc) { /* * If the SET TARGET PORT GROUPS attempts to establish @@ -618,17 +623,31 @@ out: * Check implicit and explicit ALUA state change request. */ static sense_reason_t -core_alua_check_transition(int state, int *primary) +core_alua_check_transition(int state, int valid, int *primary) { + /* + * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are + * defined as primary target port asymmetric access states. + */ switch (state) { case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED: + if (!(valid & ALUA_AO_SUP)) + goto not_supported; + *primary = 1; + break; case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED: + if (!(valid & ALUA_AN_SUP)) + goto not_supported; + *primary = 1; + break; case ALUA_ACCESS_STATE_STANDBY: + if (!(valid & ALUA_S_SUP)) + goto not_supported; + *primary = 1; + break; case ALUA_ACCESS_STATE_UNAVAILABLE: - /* - * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are - * defined as primary target port asymmetric access states. - */ + if (!(valid & ALUA_U_SUP)) + goto not_supported; *primary = 1; break; case ALUA_ACCESS_STATE_OFFLINE: @@ -636,14 +655,27 @@ core_alua_check_transition(int state, int *primary) * OFFLINE state is defined as a secondary target port * asymmetric access state. */ + if (!(valid & ALUA_O_SUP)) + goto not_supported; *primary = 0; break; + case ALUA_ACCESS_STATE_TRANSITION: + /* + * Transitioning is set internally, and + * cannot be selected manually. + */ + goto not_supported; default: pr_err("Unknown ALUA access state: 0x%02x\n", state); return TCM_INVALID_PARAMETER_LIST; } return 0; + +not_supported: + pr_err("ALUA access state %s not supported", + core_alua_dump_state(state)); + return TCM_INVALID_PARAMETER_LIST; } static char *core_alua_dump_state(int state) @@ -659,6 +691,8 @@ static char *core_alua_dump_state(int state) return "Unavailable"; case ALUA_ACCESS_STATE_OFFLINE: return "Offline"; + case ALUA_ACCESS_STATE_TRANSITION: + return "Transitioning"; default: return "Unknown"; } @@ -884,9 +918,10 @@ int core_alua_do_port_transition( 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; + int primary, valid_states; - if (core_alua_check_transition(new_state, &primary) != 0) + valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states; + if (core_alua_check_transition(new_state, valid_states, &primary) != 0) return -EINVAL; md_buf = kzalloc(l_tg_pt_gp->tg_pt_gp_md_buf_len, GFP_KERNEL);