target: Drop arbitrary maximum I/O size limit

[firefly-linux-kernel-4.4.55.git] / drivers / target / target_core_file.c

diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index 72c83d98662bb7117d3911ab931940990a79f82d..b09021135c3b78fa98b4becd91f4347c02867385 100644 (file)
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -37,6 +37,7 @@
 
 #include <target/target_core_base.h>
 #include <target/target_core_backend.h>
+#include <target/target_core_backend_configfs.h>
 
 #include "target_core_file.h"
 
@@ -620,7 +621,16 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
        struct fd_prot fd_prot;
        sense_reason_t rc;
        int ret = 0;
-
+       /*
+        * We are currently limited by the number of iovecs (2048) per
+        * single vfs_[writev,readv] call.
+        */
+       if (cmd->data_length > FD_MAX_BYTES) {
+               pr_err("FILEIO: Not able to process I/O of %u bytes due to"
+                      "FD_MAX_BYTES: %u iovec count limitiation\n",
+                       cmd->data_length, FD_MAX_BYTES);
+               return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+       }
        /*
         * Call vectorized fileio functions to map struct scatterlist
         * physical memory addresses to struct iovec virtual memory.
@@ -934,6 +944,42 @@ fd_parse_cdb(struct se_cmd *cmd)
        return sbc_parse_cdb(cmd, &fd_sbc_ops);
 }
 
+DEF_TB_DEFAULT_ATTRIBS(fileio);
+
+static struct configfs_attribute *fileio_backend_dev_attrs[] = {
+       &fileio_dev_attrib_emulate_model_alias.attr,
+       &fileio_dev_attrib_emulate_dpo.attr,
+       &fileio_dev_attrib_emulate_fua_write.attr,
+       &fileio_dev_attrib_emulate_fua_read.attr,
+       &fileio_dev_attrib_emulate_write_cache.attr,
+       &fileio_dev_attrib_emulate_ua_intlck_ctrl.attr,
+       &fileio_dev_attrib_emulate_tas.attr,
+       &fileio_dev_attrib_emulate_tpu.attr,
+       &fileio_dev_attrib_emulate_tpws.attr,
+       &fileio_dev_attrib_emulate_caw.attr,
+       &fileio_dev_attrib_emulate_3pc.attr,
+       &fileio_dev_attrib_pi_prot_type.attr,
+       &fileio_dev_attrib_hw_pi_prot_type.attr,
+       &fileio_dev_attrib_pi_prot_format.attr,
+       &fileio_dev_attrib_enforce_pr_isids.attr,
+       &fileio_dev_attrib_is_nonrot.attr,
+       &fileio_dev_attrib_emulate_rest_reord.attr,
+       &fileio_dev_attrib_force_pr_aptpl.attr,
+       &fileio_dev_attrib_hw_block_size.attr,
+       &fileio_dev_attrib_block_size.attr,
+       &fileio_dev_attrib_hw_max_sectors.attr,
+       &fileio_dev_attrib_fabric_max_sectors.attr,
+       &fileio_dev_attrib_optimal_sectors.attr,
+       &fileio_dev_attrib_hw_queue_depth.attr,
+       &fileio_dev_attrib_queue_depth.attr,
+       &fileio_dev_attrib_max_unmap_lba_count.attr,
+       &fileio_dev_attrib_max_unmap_block_desc_count.attr,
+       &fileio_dev_attrib_unmap_granularity.attr,
+       &fileio_dev_attrib_unmap_granularity_alignment.attr,
+       &fileio_dev_attrib_max_write_same_len.attr,
+       NULL,
+};
+
 static struct se_subsystem_api fileio_template = {
        .name                   = "fileio",
        .inquiry_prod           = "FILEIO",
@@ -957,6 +1003,11 @@ static struct se_subsystem_api fileio_template = {
 
 static int __init fileio_module_init(void)
 {
+       struct target_backend_cits *tbc = &fileio_template.tb_cits;
+
+       target_core_setup_sub_cits(&fileio_template);
+       tbc->tb_dev_attrib_cit.ct_attrs = fileio_backend_dev_attrs;
+
        return transport_subsystem_register(&fileio_template);
 }