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Date: Tue, 14 Sep 2010 18:44:03 +0400
From: Vladislav Bolkhovitin <vst@...b.net>
To: linux-scsi@...r.kernel.org
CC: linux-kernel@...r.kernel.org,
scst-devel <scst-devel@...ts.sourceforge.net>,
James Bottomley <James.Bottomley@...senPartnership.com>,
Andrew Morton <akpm@...ux-foundation.org>,
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
Mike Christie <michaelc@...wisc.edu>,
Jeff Garzik <jeff@...zik.org>, Vu Pham <vuhuong@...lanox.com>,
Bart Van Assche <bart.vanassche@...il.com>,
James Smart <James.Smart@...lex.Com>,
Joe Eykholt <jeykholt@...co.com>, Andy Yan <ayan@...vell.com>,
Chetan Loke <generationgnu@...oo.com>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Hannes Reinecke <hare@...e.de>,
Richard Sharpe <realrichardsharpe@...il.com>
Subject: [PATCH 8/17]: SCST SYSFS interface implementation
This patch contains SYSFS interface implementation
Signed-off-by: Daniel Henrique Debonzi <debonzi@...ux.vnet.ibm.com>
Signed-off-by: Vladislav Bolkhovitin <vst@...b.net>
---
scst_sysfs.c | 4967 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 4967 insertions(+)
diff -uprN orig/linux-2.6.35/drivers/scst/scst_sysfs.c linux-2.6.35/drivers/scst/scst_sysfs.c
--- orig/linux-2.6.35/drivers/scst/scst_sysfs.c
+++ linux-2.6.35/drivers/scst/scst_sysfs.c
@@ -0,0 +1,4967 @@
+/*
+ * scst_sysfs.c
+ *
+ * Copyright (C) 2009 Daniel Henrique Debonzi <debonzi@...ux.vnet.ibm.com>
+ * Copyright (C) 2009 - 2010 Vladislav Bolkhovitin <vst@...b.net>
+ * Copyright (C) 2009 - 2010 ID7 Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, version 2
+ * of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kobject.h>
+#include <linux/string.h>
+#include <linux/sysfs.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/ctype.h>
+#include <linux/slab.h>
+#include <linux/kthread.h>
+
+#include <scst/scst.h>
+#include "scst_priv.h"
+#include "scst_mem.h"
+#include "scst_pres.h"
+
+static DECLARE_COMPLETION(scst_sysfs_root_release_completion);
+
+static struct kobject scst_sysfs_root_kobj;
+static struct kobject *scst_targets_kobj;
+static struct kobject *scst_devices_kobj;
+static struct kobject *scst_sgv_kobj;
+static struct kobject *scst_handlers_kobj;
+
+static const char *scst_dev_handler_types[] = {
+ "Direct-access device (e.g., magnetic disk)",
+ "Sequential-access device (e.g., magnetic tape)",
+ "Printer device",
+ "Processor device",
+ "Write-once device (e.g., some optical disks)",
+ "CD-ROM device",
+ "Scanner device (obsolete)",
+ "Optical memory device (e.g., some optical disks)",
+ "Medium changer device (e.g., jukeboxes)",
+ "Communications device (obsolete)",
+ "Defined by ASC IT8 (Graphic arts pre-press devices)",
+ "Defined by ASC IT8 (Graphic arts pre-press devices)",
+ "Storage array controller device (e.g., RAID)",
+ "Enclosure services device",
+ "Simplified direct-access device (e.g., magnetic disk)",
+ "Optical card reader/writer device"
+};
+
+#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
+
+static DEFINE_MUTEX(scst_log_mutex);
+
+static struct scst_trace_log scst_trace_tbl[] = {
+ { TRACE_OUT_OF_MEM, "out_of_mem" },
+ { TRACE_MINOR, "minor" },
+ { TRACE_SG_OP, "sg" },
+ { TRACE_MEMORY, "mem" },
+ { TRACE_BUFF, "buff" },
+ { TRACE_PID, "pid" },
+ { TRACE_LINE, "line" },
+ { TRACE_FUNCTION, "function" },
+ { TRACE_DEBUG, "debug" },
+ { TRACE_SPECIAL, "special" },
+ { TRACE_SCSI, "scsi" },
+ { TRACE_MGMT, "mgmt" },
+ { TRACE_MGMT_DEBUG, "mgmt_dbg" },
+ { TRACE_FLOW_CONTROL, "flow_control" },
+ { TRACE_PRES, "pr" },
+ { 0, NULL }
+};
+
+static struct scst_trace_log scst_local_trace_tbl[] = {
+ { TRACE_RTRY, "retry" },
+ { TRACE_SCSI_SERIALIZING, "scsi_serializing" },
+ { TRACE_RCV_BOT, "recv_bot" },
+ { TRACE_SND_BOT, "send_bot" },
+ { TRACE_RCV_TOP, "recv_top" },
+ { TRACE_SND_TOP, "send_top" },
+ { 0, NULL }
+};
+
+static ssize_t scst_trace_level_show(const struct scst_trace_log *local_tbl,
+ unsigned long log_level, char *buf, const char *help);
+static int scst_write_trace(const char *buf, size_t length,
+ unsigned long *log_level, unsigned long default_level,
+ const char *name, const struct scst_trace_log *tbl);
+
+#endif /* defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING) */
+
+static ssize_t scst_luns_mgmt_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf);
+static ssize_t scst_luns_mgmt_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count);
+static ssize_t scst_tgt_addr_method_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf);
+static ssize_t scst_tgt_addr_method_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count);
+static ssize_t scst_tgt_io_grouping_type_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf);
+static ssize_t scst_tgt_io_grouping_type_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count);
+static ssize_t scst_ini_group_mgmt_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf);
+static ssize_t scst_ini_group_mgmt_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count);
+static ssize_t scst_rel_tgt_id_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf);
+static ssize_t scst_rel_tgt_id_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count);
+static ssize_t scst_acg_luns_mgmt_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count);
+static ssize_t scst_acg_ini_mgmt_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf);
+static ssize_t scst_acg_ini_mgmt_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count);
+static ssize_t scst_acg_addr_method_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf);
+static ssize_t scst_acg_addr_method_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count);
+static ssize_t scst_acg_io_grouping_type_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf);
+static ssize_t scst_acg_io_grouping_type_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count);
+static ssize_t scst_acn_file_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf);
+
+/**
+ ** Sysfs work
+ **/
+
+static DEFINE_SPINLOCK(sysfs_work_lock);
+static LIST_HEAD(sysfs_work_list);
+static DECLARE_WAIT_QUEUE_HEAD(sysfs_work_waitQ);
+static int active_sysfs_works;
+static int last_sysfs_work_res;
+static struct task_struct *sysfs_work_thread;
+
+/**
+ * scst_alloc_sysfs_work() - allocates a sysfs work
+ */
+int scst_alloc_sysfs_work(int (*sysfs_work_fn)(struct scst_sysfs_work_item *),
+ struct scst_sysfs_work_item **res_work)
+{
+ int res = 0;
+ struct scst_sysfs_work_item *work;
+
+ if (sysfs_work_fn == NULL) {
+ PRINT_ERROR("%s", "sysfs_work_fn is NULL");
+ res = -EINVAL;
+ goto out;
+ }
+
+ *res_work = NULL;
+
+ work = kzalloc(sizeof(*work), GFP_KERNEL);
+ if (work == NULL) {
+ PRINT_ERROR("Unable to alloc sysfs work (size %zd)",
+ sizeof(*work));
+ res = -ENOMEM;
+ goto out;
+ }
+
+ kref_init(&work->sysfs_work_kref);
+ init_completion(&work->sysfs_work_done);
+ work->sysfs_work_fn = sysfs_work_fn;
+
+ *res_work = work;
+
+out:
+ return res;
+}
+EXPORT_SYMBOL(scst_alloc_sysfs_work);
+
+static void scst_sysfs_work_release(struct kref *kref)
+{
+ struct scst_sysfs_work_item *work;
+
+ work = container_of(kref, struct scst_sysfs_work_item,
+ sysfs_work_kref);
+
+ TRACE_DBG("Freeing sysfs work %p (buf %p)", work, work->buf);
+
+ kfree(work->buf);
+ kfree(work->res_buf);
+ kfree(work);
+ return;
+}
+
+/**
+ * scst_sysfs_work_get() - increases ref counter of the sysfs work
+ */
+void scst_sysfs_work_get(struct scst_sysfs_work_item *work)
+{
+ kref_get(&work->sysfs_work_kref);
+}
+EXPORT_SYMBOL(scst_sysfs_work_get);
+
+/**
+ * scst_sysfs_work_put() - decreases ref counter of the sysfs work
+ */
+void scst_sysfs_work_put(struct scst_sysfs_work_item *work)
+{
+ kref_put(&work->sysfs_work_kref, scst_sysfs_work_release);
+}
+EXPORT_SYMBOL(scst_sysfs_work_put);
+
+/**
+ * scst_sysfs_queue_wait_work() - waits for the work to complete
+ *
+ * Returnes status of the completed work or -EAGAIN if the work not
+ * completed before timeout. In the latter case a user should poll
+ * last_sysfs_mgmt_res until it returns the result of the processing.
+ */
+int scst_sysfs_queue_wait_work(struct scst_sysfs_work_item *work)
+{
+ int res = 0, rc;
+ unsigned long timeout = 15*HZ;
+
+ spin_lock(&sysfs_work_lock);
+
+ TRACE_DBG("Adding sysfs work %p to the list", work);
+ list_add_tail(&work->sysfs_work_list_entry, &sysfs_work_list);
+
+ active_sysfs_works++;
+
+ spin_unlock(&sysfs_work_lock);
+
+ kref_get(&work->sysfs_work_kref);
+
+ wake_up(&sysfs_work_waitQ);
+
+ while (1) {
+ rc = wait_for_completion_interruptible_timeout(
+ &work->sysfs_work_done, timeout);
+ if (rc == 0) {
+ if (!mutex_is_locked(&scst_mutex)) {
+ TRACE_DBG("scst_mutex not locked, continue "
+ "waiting (work %p)", work);
+ timeout = 5*HZ;
+ continue;
+ }
+ TRACE_MGMT_DBG("Time out waiting for work %p",
+ work);
+ res = -EAGAIN;
+ goto out_put;
+ } else if (rc < 0) {
+ res = rc;
+ goto out_put;
+ }
+ break;
+ }
+
+ res = work->work_res;
+
+out_put:
+ kref_put(&work->sysfs_work_kref, scst_sysfs_work_release);
+ return res;
+}
+EXPORT_SYMBOL(scst_sysfs_queue_wait_work);
+
+/* Called under sysfs_work_lock and drops/reaquire it inside */
+static void scst_process_sysfs_works(void)
+{
+ struct scst_sysfs_work_item *work;
+
+ while (!list_empty(&sysfs_work_list)) {
+ work = list_entry(sysfs_work_list.next,
+ struct scst_sysfs_work_item, sysfs_work_list_entry);
+ list_del(&work->sysfs_work_list_entry);
+ spin_unlock(&sysfs_work_lock);
+
+ TRACE_DBG("Sysfs work %p", work);
+
+ work->work_res = work->sysfs_work_fn(work);
+
+ spin_lock(&sysfs_work_lock);
+ last_sysfs_work_res = work->work_res;
+ active_sysfs_works--;
+ spin_unlock(&sysfs_work_lock);
+
+ complete_all(&work->sysfs_work_done);
+ kref_put(&work->sysfs_work_kref, scst_sysfs_work_release);
+
+ spin_lock(&sysfs_work_lock);
+ }
+ return;
+}
+
+static inline int test_sysfs_work_list(void)
+{
+ int res = !list_empty(&sysfs_work_list) ||
+ unlikely(kthread_should_stop());
+ return res;
+}
+
+static int sysfs_work_thread_fn(void *arg)
+{
+
+ PRINT_INFO("User interface thread started, PID %d", current->pid);
+
+ current->flags |= PF_NOFREEZE;
+
+ set_user_nice(current, -10);
+
+ spin_lock(&sysfs_work_lock);
+ while (!kthread_should_stop()) {
+ wait_queue_t wait;
+ init_waitqueue_entry(&wait, current);
+
+ if (!test_sysfs_work_list()) {
+ add_wait_queue_exclusive(&sysfs_work_waitQ, &wait);
+ for (;;) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (test_sysfs_work_list())
+ break;
+ spin_unlock(&sysfs_work_lock);
+ schedule();
+ spin_lock(&sysfs_work_lock);
+ }
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&sysfs_work_waitQ, &wait);
+ }
+
+ scst_process_sysfs_works();
+ }
+ spin_unlock(&sysfs_work_lock);
+
+ /*
+ * If kthread_should_stop() is true, we are guaranteed to be
+ * on the module unload, so both lists must be empty.
+ */
+ BUG_ON(!list_empty(&sysfs_work_list));
+
+ PRINT_INFO("User interface thread PID %d finished", current->pid);
+ return 0;
+}
+
+/* No locks */
+static int scst_check_grab_tgtt_ptr(struct scst_tgt_template *tgtt)
+{
+ int res = 0;
+ struct scst_tgt_template *tt;
+
+ mutex_lock(&scst_mutex);
+
+ list_for_each_entry(tt, &scst_template_list, scst_template_list_entry) {
+ if (tt == tgtt) {
+ tgtt->tgtt_active_sysfs_works_count++;
+ goto out_unlock;
+ }
+ }
+
+ TRACE_DBG("Tgtt %p not found", tgtt);
+ res = -ENOENT;
+
+out_unlock:
+ mutex_unlock(&scst_mutex);
+ return res;
+}
+
+/* No locks */
+static void scst_ungrab_tgtt_ptr(struct scst_tgt_template *tgtt)
+{
+
+ mutex_lock(&scst_mutex);
+ tgtt->tgtt_active_sysfs_works_count--;
+ mutex_unlock(&scst_mutex);
+ return;
+}
+
+/* scst_mutex supposed to be locked */
+static int scst_check_tgt_acg_ptrs(struct scst_tgt *tgt, struct scst_acg *acg)
+{
+ int res = 0;
+ struct scst_tgt_template *tgtt;
+
+ list_for_each_entry(tgtt, &scst_template_list, scst_template_list_entry) {
+ struct scst_tgt *t;
+ list_for_each_entry(t, &tgtt->tgt_list, tgt_list_entry) {
+ if (t == tgt) {
+ struct scst_acg *a;
+ if (acg == NULL)
+ goto out;
+ if (acg == tgt->default_acg)
+ goto out;
+ list_for_each_entry(a, &tgt->tgt_acg_list,
+ acg_list_entry) {
+ if (a == acg)
+ goto out;
+ }
+ }
+ }
+ }
+
+ TRACE_DBG("Tgt %p/ACG %p not found", tgt, acg);
+ res = -ENOENT;
+
+out:
+ return res;
+}
+
+/* scst_mutex supposed to be locked */
+static int scst_check_devt_ptr(struct scst_dev_type *devt,
+ struct list_head *list)
+{
+ int res = 0;
+ struct scst_dev_type *dt;
+
+ list_for_each_entry(dt, list, dev_type_list_entry) {
+ if (dt == devt)
+ goto out;
+ }
+
+ TRACE_DBG("Devt %p not found", devt);
+ res = -ENOENT;
+
+out:
+ return res;
+}
+
+/* scst_mutex supposed to be locked */
+static int scst_check_dev_ptr(struct scst_device *dev)
+{
+ int res = 0;
+ struct scst_device *d;
+
+ list_for_each_entry(d, &scst_dev_list, dev_list_entry) {
+ if (d == dev)
+ goto out;
+ }
+
+ TRACE_DBG("Dev %p not found", dev);
+ res = -ENOENT;
+
+out:
+ return res;
+}
+
+/* No locks */
+static int scst_check_grab_devt_ptr(struct scst_dev_type *devt,
+ struct list_head *list)
+{
+ int res = 0;
+ struct scst_dev_type *dt;
+
+ mutex_lock(&scst_mutex);
+
+ list_for_each_entry(dt, list, dev_type_list_entry) {
+ if (dt == devt) {
+ devt->devt_active_sysfs_works_count++;
+ goto out_unlock;
+ }
+ }
+
+ TRACE_DBG("Devt %p not found", devt);
+ res = -ENOENT;
+
+out_unlock:
+ mutex_unlock(&scst_mutex);
+ return res;
+}
+
+/* No locks */
+static void scst_ungrab_devt_ptr(struct scst_dev_type *devt)
+{
+
+ mutex_lock(&scst_mutex);
+ devt->devt_active_sysfs_works_count--;
+ mutex_unlock(&scst_mutex);
+ return;
+}
+
+/**
+ ** Regilar SCST sysfs ops
+ **/
+static ssize_t scst_show(struct kobject *kobj, struct attribute *attr,
+ char *buf)
+{
+ struct kobj_attribute *kobj_attr;
+ kobj_attr = container_of(attr, struct kobj_attribute, attr);
+
+ return kobj_attr->show(kobj, kobj_attr, buf);
+}
+
+static ssize_t scst_store(struct kobject *kobj, struct attribute *attr,
+ const char *buf, size_t count)
+{
+ struct kobj_attribute *kobj_attr;
+ kobj_attr = container_of(attr, struct kobj_attribute, attr);
+
+ if (kobj_attr->store)
+ return kobj_attr->store(kobj, kobj_attr, buf, count);
+ else
+ return -EIO;
+}
+
+static const struct sysfs_ops scst_sysfs_ops = {
+ .show = scst_show,
+ .store = scst_store,
+};
+
+const struct sysfs_ops *scst_sysfs_get_sysfs_ops(void)
+{
+ return &scst_sysfs_ops;
+}
+EXPORT_SYMBOL_GPL(scst_sysfs_get_sysfs_ops);
+
+/**
+ ** Target Template
+ **/
+
+static void scst_tgtt_release(struct kobject *kobj)
+{
+ struct scst_tgt_template *tgtt;
+
+ tgtt = container_of(kobj, struct scst_tgt_template, tgtt_kobj);
+ complete_all(&tgtt->tgtt_kobj_release_cmpl);
+ return;
+}
+
+static struct kobj_type tgtt_ktype = {
+ .sysfs_ops = &scst_sysfs_ops,
+ .release = scst_tgtt_release,
+};
+
+#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
+
+static ssize_t scst_tgtt_trace_level_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct scst_tgt_template *tgtt;
+
+ tgtt = container_of(kobj, struct scst_tgt_template, tgtt_kobj);
+
+ return scst_trace_level_show(tgtt->trace_tbl,
+ tgtt->trace_flags ? *tgtt->trace_flags : 0, buf,
+ tgtt->trace_tbl_help);
+}
+
+static ssize_t scst_tgtt_trace_level_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ int res;
+ struct scst_tgt_template *tgtt;
+
+ tgtt = container_of(kobj, struct scst_tgt_template, tgtt_kobj);
+
+ if (mutex_lock_interruptible(&scst_log_mutex) != 0) {
+ res = -EINTR;
+ goto out;
+ }
+
+ res = scst_write_trace(buf, count, tgtt->trace_flags,
+ tgtt->default_trace_flags, tgtt->name, tgtt->trace_tbl);
+
+ mutex_unlock(&scst_log_mutex);
+
+out:
+ return res;
+}
+
+static struct kobj_attribute tgtt_trace_attr =
+ __ATTR(trace_level, S_IRUGO | S_IWUSR,
+ scst_tgtt_trace_level_show, scst_tgtt_trace_level_store);
+
+#endif /* #if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING) */
+
+static ssize_t scst_tgtt_mgmt_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+char *help = "Usage: echo \"add_target target_name [parameters]\" "
+ ">mgmt\n"
+ " echo \"del_target target_name\" >mgmt\n"
+ "%s%s"
+ "%s"
+ "\n"
+ "where parameters are one or more "
+ "param_name=value pairs separated by ';'\n\n"
+ "%s%s%s%s%s%s%s%s\n";
+ struct scst_tgt_template *tgtt;
+
+ tgtt = container_of(kobj, struct scst_tgt_template, tgtt_kobj);
+
+ return scnprintf(buf, SCST_SYSFS_BLOCK_SIZE, help,
+ (tgtt->tgtt_optional_attributes != NULL) ?
+ " echo \"add_attribute <attribute> <value>\" >mgmt\n"
+ " echo \"del_attribute <attribute> <value>\" >mgmt\n" : "",
+ (tgtt->tgt_optional_attributes != NULL) ?
+ " echo \"add_target_attribute target_name <attribute> <value>\" >mgmt\n"
+ " echo \"del_target_attribute target_name <attribute> <value>\" >mgmt\n" : "",
+ (tgtt->mgmt_cmd_help) ? tgtt->mgmt_cmd_help : "",
+ (tgtt->add_target_parameters != NULL) ?
+ "The following parameters available: " : "",
+ (tgtt->add_target_parameters != NULL) ?
+ tgtt->add_target_parameters : "",
+ (tgtt->tgtt_optional_attributes != NULL) ?
+ "The following target driver attributes available: " : "",
+ (tgtt->tgtt_optional_attributes != NULL) ?
+ tgtt->tgtt_optional_attributes : "",
+ (tgtt->tgtt_optional_attributes != NULL) ? "\n" : "",
+ (tgtt->tgt_optional_attributes != NULL) ?
+ "The following target attributes available: " : "",
+ (tgtt->tgt_optional_attributes != NULL) ?
+ tgtt->tgt_optional_attributes : "",
+ (tgtt->tgt_optional_attributes != NULL) ? "\n" : "");
+}
+
+static int scst_process_tgtt_mgmt_store(char *buffer,
+ struct scst_tgt_template *tgtt)
+{
+ int res = 0;
+ char *p, *pp, *target_name;
+
+ TRACE_DBG("buffer %s", buffer);
+
+ /* Check if our pointer is still alive and, if yes, grab it */
+ if (scst_check_grab_tgtt_ptr(tgtt) != 0)
+ goto out;
+
+ pp = buffer;
+ if (pp[strlen(pp) - 1] == '\n')
+ pp[strlen(pp) - 1] = '\0';
+
+ p = scst_get_next_lexem(&pp);
+
+ if (strcasecmp("add_target", p) == 0) {
+ target_name = scst_get_next_lexem(&pp);
+ if (*target_name == '\0') {
+ PRINT_ERROR("%s", "Target name required");
+ res = -EINVAL;
+ goto out_ungrab;
+ }
+ res = tgtt->add_target(target_name, pp);
+ } else if (strcasecmp("del_target", p) == 0) {
+ target_name = scst_get_next_lexem(&pp);
+ if (*target_name == '\0') {
+ PRINT_ERROR("%s", "Target name required");
+ res = -EINVAL;
+ goto out_ungrab;
+ }
+
+ p = scst_get_next_lexem(&pp);
+ if (*p != '\0')
+ goto out_syntax_err;
+
+ res = tgtt->del_target(target_name);
+ } else if (tgtt->mgmt_cmd != NULL) {
+ scst_restore_token_str(p, pp);
+ res = tgtt->mgmt_cmd(buffer);
+ } else {
+ PRINT_ERROR("Unknown action \"%s\"", p);
+ res = -EINVAL;
+ goto out_ungrab;
+ }
+
+out_ungrab:
+ scst_ungrab_tgtt_ptr(tgtt);
+
+out:
+ return res;
+
+out_syntax_err:
+ PRINT_ERROR("Syntax error on \"%s\"", p);
+ res = -EINVAL;
+ goto out_ungrab;
+}
+
+static int scst_tgtt_mgmt_store_work_fn(struct scst_sysfs_work_item *work)
+{
+ return scst_process_tgtt_mgmt_store(work->buf, work->tgtt);
+}
+
+static ssize_t scst_tgtt_mgmt_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ int res;
+ char *buffer;
+ struct scst_sysfs_work_item *work;
+ struct scst_tgt_template *tgtt;
+
+ tgtt = container_of(kobj, struct scst_tgt_template, tgtt_kobj);
+
+ buffer = kzalloc(count+1, GFP_KERNEL);
+ if (buffer == NULL) {
+ res = -ENOMEM;
+ goto out;
+ }
+ memcpy(buffer, buf, count);
+ buffer[count] = '\0';
+
+ res = scst_alloc_sysfs_work(scst_tgtt_mgmt_store_work_fn, &work);
+ if (res != 0)
+ goto out_free;
+
+ work->buf = buffer;
+ work->tgtt = tgtt;
+
+ res = scst_sysfs_queue_wait_work(work);
+ if (res == 0)
+ res = count;
+
+out:
+ return res;
+
+out_free:
+ kfree(buffer);
+ goto out;
+}
+
+static struct kobj_attribute scst_tgtt_mgmt =
+ __ATTR(mgmt, S_IRUGO | S_IWUSR, scst_tgtt_mgmt_show,
+ scst_tgtt_mgmt_store);
+
+int scst_tgtt_sysfs_create(struct scst_tgt_template *tgtt)
+{
+ int res = 0;
+ const struct attribute **pattr;
+
+ init_completion(&tgtt->tgtt_kobj_release_cmpl);
+
+ res = kobject_init_and_add(&tgtt->tgtt_kobj, &tgtt_ktype,
+ scst_targets_kobj, tgtt->name);
+ if (res != 0) {
+ PRINT_ERROR("Can't add tgtt %s to sysfs", tgtt->name);
+ goto out;
+ }
+
+ if (tgtt->add_target != NULL) {
+ res = sysfs_create_file(&tgtt->tgtt_kobj,
+ &scst_tgtt_mgmt.attr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add mgmt attr for target driver %s",
+ tgtt->name);
+ goto out_del;
+ }
+ }
+
+ pattr = tgtt->tgtt_attrs;
+ if (pattr != NULL) {
+ while (*pattr != NULL) {
+ TRACE_DBG("Creating attr %s for target driver %s",
+ (*pattr)->name, tgtt->name);
+ res = sysfs_create_file(&tgtt->tgtt_kobj, *pattr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add attr %s for target "
+ "driver %s", (*pattr)->name,
+ tgtt->name);
+ goto out_del;
+ }
+ pattr++;
+ }
+ }
+
+#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
+ if (tgtt->trace_flags != NULL) {
+ res = sysfs_create_file(&tgtt->tgtt_kobj,
+ &tgtt_trace_attr.attr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add trace_flag for target "
+ "driver %s", tgtt->name);
+ goto out_del;
+ }
+ }
+#endif
+
+out:
+ return res;
+
+out_del:
+ scst_tgtt_sysfs_del(tgtt);
+ goto out;
+}
+
+/*
+ * Must not be called under scst_mutex, due to possible deadlock with
+ * sysfs ref counting in sysfs works (it is waiting for the last put, but
+ * the last ref counter holder is waiting for scst_mutex)
+ */
+void scst_tgtt_sysfs_del(struct scst_tgt_template *tgtt)
+{
+ int rc;
+
+ kobject_del(&tgtt->tgtt_kobj);
+ kobject_put(&tgtt->tgtt_kobj);
+
+ rc = wait_for_completion_timeout(&tgtt->tgtt_kobj_release_cmpl, HZ);
+ if (rc == 0) {
+ PRINT_INFO("Waiting for releasing sysfs entry "
+ "for target template %s (%d refs)...", tgtt->name,
+ atomic_read(&tgtt->tgtt_kobj.kref.refcount));
+ wait_for_completion(&tgtt->tgtt_kobj_release_cmpl);
+ PRINT_INFO("Done waiting for releasing sysfs "
+ "entry for target template %s", tgtt->name);
+ }
+ return;
+}
+
+/**
+ ** Target directory implementation
+ **/
+
+static void scst_tgt_release(struct kobject *kobj)
+{
+ struct scst_tgt *tgt;
+
+ tgt = container_of(kobj, struct scst_tgt, tgt_kobj);
+ complete_all(&tgt->tgt_kobj_release_cmpl);
+ return;
+}
+
+static struct kobj_type tgt_ktype = {
+ .sysfs_ops = &scst_sysfs_ops,
+ .release = scst_tgt_release,
+};
+
+static void scst_acg_release(struct kobject *kobj)
+{
+ struct scst_acg *acg;
+
+ acg = container_of(kobj, struct scst_acg, acg_kobj);
+ complete_all(&acg->acg_kobj_release_cmpl);
+ return;
+}
+
+static struct kobj_type acg_ktype = {
+ .sysfs_ops = &scst_sysfs_ops,
+ .release = scst_acg_release,
+};
+
+static struct kobj_attribute scst_luns_mgmt =
+ __ATTR(mgmt, S_IRUGO | S_IWUSR, scst_luns_mgmt_show,
+ scst_luns_mgmt_store);
+
+static struct kobj_attribute scst_acg_luns_mgmt =
+ __ATTR(mgmt, S_IRUGO | S_IWUSR, scst_luns_mgmt_show,
+ scst_acg_luns_mgmt_store);
+
+static struct kobj_attribute scst_acg_ini_mgmt =
+ __ATTR(mgmt, S_IRUGO | S_IWUSR, scst_acg_ini_mgmt_show,
+ scst_acg_ini_mgmt_store);
+
+static struct kobj_attribute scst_ini_group_mgmt =
+ __ATTR(mgmt, S_IRUGO | S_IWUSR, scst_ini_group_mgmt_show,
+ scst_ini_group_mgmt_store);
+
+static struct kobj_attribute scst_tgt_addr_method =
+ __ATTR(addr_method, S_IRUGO | S_IWUSR, scst_tgt_addr_method_show,
+ scst_tgt_addr_method_store);
+
+static struct kobj_attribute scst_tgt_io_grouping_type =
+ __ATTR(io_grouping_type, S_IRUGO | S_IWUSR,
+ scst_tgt_io_grouping_type_show,
+ scst_tgt_io_grouping_type_store);
+
+static struct kobj_attribute scst_rel_tgt_id =
+ __ATTR(rel_tgt_id, S_IRUGO | S_IWUSR, scst_rel_tgt_id_show,
+ scst_rel_tgt_id_store);
+
+static struct kobj_attribute scst_acg_addr_method =
+ __ATTR(addr_method, S_IRUGO | S_IWUSR, scst_acg_addr_method_show,
+ scst_acg_addr_method_store);
+
+static struct kobj_attribute scst_acg_io_grouping_type =
+ __ATTR(io_grouping_type, S_IRUGO | S_IWUSR,
+ scst_acg_io_grouping_type_show,
+ scst_acg_io_grouping_type_store);
+
+static ssize_t scst_tgt_enable_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct scst_tgt *tgt;
+ int res;
+ bool enabled;
+
+ tgt = container_of(kobj, struct scst_tgt, tgt_kobj);
+
+ enabled = tgt->tgtt->is_target_enabled(tgt);
+
+ res = sprintf(buf, "%d\n", enabled ? 1 : 0);
+ return res;
+}
+
+static int scst_process_tgt_enable_store(struct scst_tgt *tgt, bool enable)
+{
+ int res;
+
+ /* Tgt protected by kobject reference */
+
+ TRACE_DBG("tgt %s, enable %d", tgt->tgt_name, enable);
+
+ if (enable && (tgt->rel_tgt_id == 0)) {
+ res = gen_relative_target_port_id(&tgt->rel_tgt_id);
+ if (res != 0)
+ goto out_put;
+ PRINT_INFO("Using autogenerated rel ID %d for target "
+ "%s", tgt->rel_tgt_id, tgt->tgt_name);
+ } else {
+ if (!scst_is_relative_target_port_id_unique(
+ tgt->rel_tgt_id, tgt)) {
+ PRINT_ERROR("Relative port id %d is not unique",
+ tgt->rel_tgt_id);
+ res = -EBADSLT;
+ goto out_put;
+ }
+ }
+
+ res = tgt->tgtt->enable_target(tgt, enable);
+
+out_put:
+ kobject_put(&tgt->tgt_kobj);
+ return res;
+}
+
+static int scst_tgt_enable_store_work_fn(struct scst_sysfs_work_item *work)
+{
+ return scst_process_tgt_enable_store(work->tgt, work->enable);
+}
+
+static ssize_t scst_tgt_enable_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ int res;
+ struct scst_tgt *tgt;
+ bool enable;
+ struct scst_sysfs_work_item *work;
+
+ if (buf == NULL) {
+ PRINT_ERROR("%s: NULL buffer?", __func__);
+ res = -EINVAL;
+ goto out;
+ }
+
+ tgt = container_of(kobj, struct scst_tgt, tgt_kobj);
+
+ switch (buf[0]) {
+ case '0':
+ enable = false;
+ break;
+ case '1':
+ enable = true;
+ break;
+ default:
+ PRINT_ERROR("%s: Requested action not understood: %s",
+ __func__, buf);
+ res = -EINVAL;
+ goto out;
+ }
+
+ res = scst_alloc_sysfs_work(scst_tgt_enable_store_work_fn, &work);
+ if (res != 0)
+ goto out;
+
+ work->tgt = tgt;
+ work->enable = enable;
+
+ kobject_get(&tgt->tgt_kobj);
+
+ res = scst_sysfs_queue_wait_work(work);
+ if (res == 0)
+ res = count;
+
+out:
+ return res;
+}
+
+static struct kobj_attribute tgt_enable_attr =
+ __ATTR(enabled, S_IRUGO | S_IWUSR,
+ scst_tgt_enable_show, scst_tgt_enable_store);
+
+/*
+ * Supposed to be called under scst_mutex. In case of error will drop,
+ * then reacquire it.
+ */
+int scst_tgt_sysfs_create(struct scst_tgt *tgt)
+{
+ int res;
+ const struct attribute **pattr;
+
+ init_completion(&tgt->tgt_kobj_release_cmpl);
+
+ res = kobject_init_and_add(&tgt->tgt_kobj, &tgt_ktype,
+ &tgt->tgtt->tgtt_kobj, tgt->tgt_name);
+ if (res != 0) {
+ PRINT_ERROR("Can't add tgt %s to sysfs", tgt->tgt_name);
+ goto out;
+ }
+
+ if ((tgt->tgtt->enable_target != NULL) &&
+ (tgt->tgtt->is_target_enabled != NULL)) {
+ res = sysfs_create_file(&tgt->tgt_kobj,
+ &tgt_enable_attr.attr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add attr %s to sysfs",
+ tgt_enable_attr.attr.name);
+ goto out_err;
+ }
+ }
+
+ tgt->tgt_sess_kobj = kobject_create_and_add("sessions", &tgt->tgt_kobj);
+ if (tgt->tgt_sess_kobj == NULL) {
+ PRINT_ERROR("Can't create sess kobj for tgt %s", tgt->tgt_name);
+ goto out_nomem;
+ }
+
+ tgt->tgt_luns_kobj = kobject_create_and_add("luns", &tgt->tgt_kobj);
+ if (tgt->tgt_luns_kobj == NULL) {
+ PRINT_ERROR("Can't create luns kobj for tgt %s", tgt->tgt_name);
+ goto out_nomem;
+ }
+
+ res = sysfs_create_file(tgt->tgt_luns_kobj, &scst_luns_mgmt.attr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add attribute %s for tgt %s",
+ scst_luns_mgmt.attr.name, tgt->tgt_name);
+ goto out_err;
+ }
+
+ tgt->tgt_ini_grp_kobj = kobject_create_and_add("ini_groups",
+ &tgt->tgt_kobj);
+ if (tgt->tgt_ini_grp_kobj == NULL) {
+ PRINT_ERROR("Can't create ini_grp kobj for tgt %s",
+ tgt->tgt_name);
+ goto out_nomem;
+ }
+
+ res = sysfs_create_file(tgt->tgt_ini_grp_kobj,
+ &scst_ini_group_mgmt.attr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add attribute %s for tgt %s",
+ scst_ini_group_mgmt.attr.name, tgt->tgt_name);
+ goto out_err;
+ }
+
+ res = sysfs_create_file(&tgt->tgt_kobj,
+ &scst_rel_tgt_id.attr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add attribute %s for tgt %s",
+ scst_rel_tgt_id.attr.name, tgt->tgt_name);
+ goto out_err;
+ }
+
+ res = sysfs_create_file(&tgt->tgt_kobj,
+ &scst_tgt_addr_method.attr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add attribute %s for tgt %s",
+ scst_tgt_addr_method.attr.name, tgt->tgt_name);
+ goto out_err;
+ }
+
+ res = sysfs_create_file(&tgt->tgt_kobj,
+ &scst_tgt_io_grouping_type.attr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add attribute %s for tgt %s",
+ scst_tgt_io_grouping_type.attr.name, tgt->tgt_name);
+ goto out_err;
+ }
+
+ pattr = tgt->tgtt->tgt_attrs;
+ if (pattr != NULL) {
+ while (*pattr != NULL) {
+ TRACE_DBG("Creating attr %s for tgt %s", (*pattr)->name,
+ tgt->tgt_name);
+ res = sysfs_create_file(&tgt->tgt_kobj, *pattr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add tgt attr %s for tgt %s",
+ (*pattr)->name, tgt->tgt_name);
+ goto out_err;
+ }
+ pattr++;
+ }
+ }
+
+out:
+ return res;
+
+out_nomem:
+ res = -ENOMEM;
+
+out_err:
+ mutex_unlock(&scst_mutex);
+ scst_tgt_sysfs_del(tgt);
+ mutex_lock(&scst_mutex);
+ goto out;
+}
+
+/*
+ * Must not be called under scst_mutex, due to possible deadlock with
+ * sysfs ref counting in sysfs works (it is waiting for the last put, but
+ * the last ref counter holder is waiting for scst_mutex)
+ */
+void scst_tgt_sysfs_del(struct scst_tgt *tgt)
+{
+ int rc;
+
+ kobject_del(tgt->tgt_sess_kobj);
+ kobject_put(tgt->tgt_sess_kobj);
+
+ kobject_del(tgt->tgt_luns_kobj);
+ kobject_put(tgt->tgt_luns_kobj);
+
+ kobject_del(tgt->tgt_ini_grp_kobj);
+ kobject_put(tgt->tgt_ini_grp_kobj);
+
+ kobject_del(&tgt->tgt_kobj);
+ kobject_put(&tgt->tgt_kobj);
+
+ rc = wait_for_completion_timeout(&tgt->tgt_kobj_release_cmpl, HZ);
+ if (rc == 0) {
+ PRINT_INFO("Waiting for releasing sysfs entry "
+ "for target %s (%d refs)...", tgt->tgt_name,
+ atomic_read(&tgt->tgt_kobj.kref.refcount));
+ wait_for_completion(&tgt->tgt_kobj_release_cmpl);
+ PRINT_INFO("Done waiting for releasing sysfs "
+ "entry for target %s", tgt->tgt_name);
+ }
+ return;
+}
+
+/**
+ ** Devices directory implementation
+ **/
+
+static ssize_t scst_dev_sysfs_type_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ int pos = 0;
+
+ struct scst_device *dev;
+
+ dev = container_of(kobj, struct scst_device, dev_kobj);
+
+ pos = sprintf(buf, "%d - %s\n", dev->type,
+ (unsigned)dev->type > ARRAY_SIZE(scst_dev_handler_types) ?
+ "unknown" : scst_dev_handler_types[dev->type]);
+
+ return pos;
+}
+
+static struct kobj_attribute dev_type_attr =
+ __ATTR(type, S_IRUGO, scst_dev_sysfs_type_show, NULL);
+
+#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
+
+static ssize_t scst_dev_sysfs_dump_prs(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ struct scst_device *dev;
+
+ dev = container_of(kobj, struct scst_device, dev_kobj);
+
+ scst_pr_dump_prs(dev, true);
+ return count;
+}
+
+static struct kobj_attribute dev_dump_prs_attr =
+ __ATTR(dump_prs, S_IWUSR, NULL, scst_dev_sysfs_dump_prs);
+
+#endif /* defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING) */
+
+static int scst_process_dev_sysfs_threads_data_store(
+ struct scst_device *dev, int threads_num,
+ enum scst_dev_type_threads_pool_type threads_pool_type)
+{
+ int res = 0;
+ int oldtn = dev->threads_num;
+ enum scst_dev_type_threads_pool_type oldtt = dev->threads_pool_type;
+
+ TRACE_DBG("dev %p, threads_num %d, threads_pool_type %d", dev,
+ threads_num, threads_pool_type);
+
+ res = scst_suspend_activity(true);
+ if (res != 0)
+ goto out;
+
+ if (mutex_lock_interruptible(&scst_mutex) != 0) {
+ res = -EINTR;
+ goto out_resume;
+ }
+
+ /* Check if our pointer is still alive */
+ if (scst_check_dev_ptr(dev) != 0)
+ goto out_unlock;
+
+ scst_stop_dev_threads(dev);
+
+ dev->threads_num = threads_num;
+ dev->threads_pool_type = threads_pool_type;
+
+ res = scst_create_dev_threads(dev);
+ if (res != 0)
+ goto out_unlock;
+
+ if (oldtn != dev->threads_num)
+ PRINT_INFO("Changed cmd threads num to %d", dev->threads_num);
+ else if (oldtt != dev->threads_pool_type)
+ PRINT_INFO("Changed cmd threads pool type to %d",
+ dev->threads_pool_type);
+
+out_unlock:
+ mutex_unlock(&scst_mutex);
+
+out_resume:
+ scst_resume_activity();
+
+out:
+ return res;
+}
+
+static int scst_dev_sysfs_threads_data_store_work_fn(
+ struct scst_sysfs_work_item *work)
+{
+ return scst_process_dev_sysfs_threads_data_store(work->dev,
+ work->new_threads_num, work->new_threads_pool_type);
+}
+
+static ssize_t scst_dev_sysfs_check_threads_data(
+ struct scst_device *dev, int threads_num,
+ enum scst_dev_type_threads_pool_type threads_pool_type, bool *stop)
+{
+ int res = 0;
+
+ *stop = false;
+
+ if (dev->threads_num < 0) {
+ PRINT_ERROR("Threads pool disabled for device %s",
+ dev->virt_name);
+ res = -EPERM;
+ goto out;
+ }
+
+ if ((threads_num == dev->threads_num) &&
+ (threads_pool_type == dev->threads_pool_type)) {
+ *stop = true;
+ goto out;
+ }
+
+out:
+ return res;
+}
+
+static ssize_t scst_dev_sysfs_threads_num_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ int pos = 0;
+ struct scst_device *dev;
+
+ dev = container_of(kobj, struct scst_device, dev_kobj);
+
+ pos = sprintf(buf, "%d\n%s", dev->threads_num,
+ (dev->threads_num != dev->handler->threads_num) ?
+ SCST_SYSFS_KEY_MARK "\n" : "");
+ return pos;
+}
+
+static ssize_t scst_dev_sysfs_threads_num_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ int res;
+ struct scst_device *dev;
+ long newtn;
+ bool stop;
+ struct scst_sysfs_work_item *work;
+
+ dev = container_of(kobj, struct scst_device, dev_kobj);
+
+ res = strict_strtol(buf, 0, &newtn);
+ if (res != 0) {
+ PRINT_ERROR("strict_strtol() for %s failed: %d ", buf, res);
+ goto out;
+ }
+ if (newtn < 0) {
+ PRINT_ERROR("Illegal threads num value %ld", newtn);
+ res = -EINVAL;
+ goto out;
+ }
+
+ res = scst_dev_sysfs_check_threads_data(dev, newtn,
+ dev->threads_pool_type, &stop);
+ if ((res != 0) || stop)
+ goto out;
+
+ res = scst_alloc_sysfs_work(scst_dev_sysfs_threads_data_store_work_fn,
+ &work);
+ if (res != 0)
+ goto out;
+
+ work->dev = dev;
+ work->new_threads_num = newtn;
+ work->new_threads_pool_type = dev->threads_pool_type;
+
+ res = scst_sysfs_queue_wait_work(work);
+ if (res == 0)
+ res = count;
+
+out:
+ return res;
+}
+
+static struct kobj_attribute dev_threads_num_attr =
+ __ATTR(threads_num, S_IRUGO | S_IWUSR,
+ scst_dev_sysfs_threads_num_show,
+ scst_dev_sysfs_threads_num_store);
+
+static ssize_t scst_dev_sysfs_threads_pool_type_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ int pos = 0;
+ struct scst_device *dev;
+
+ dev = container_of(kobj, struct scst_device, dev_kobj);
+
+ if (dev->threads_num == 0) {
+ pos = sprintf(buf, "Async\n");
+ goto out;
+ } else if (dev->threads_num < 0) {
+ pos = sprintf(buf, "Not valid\n");
+ goto out;
+ }
+
+ switch (dev->threads_pool_type) {
+ case SCST_THREADS_POOL_PER_INITIATOR:
+ pos = sprintf(buf, "%s\n%s", SCST_THREADS_POOL_PER_INITIATOR_STR,
+ (dev->threads_pool_type != dev->handler->threads_pool_type) ?
+ SCST_SYSFS_KEY_MARK "\n" : "");
+ break;
+ case SCST_THREADS_POOL_SHARED:
+ pos = sprintf(buf, "%s\n%s", SCST_THREADS_POOL_SHARED_STR,
+ (dev->threads_pool_type != dev->handler->threads_pool_type) ?
+ SCST_SYSFS_KEY_MARK "\n" : "");
+ break;
+ default:
+ pos = sprintf(buf, "Unknown\n");
+ break;
+ }
+
+out:
+ return pos;
+}
+
+static ssize_t scst_dev_sysfs_threads_pool_type_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ int res;
+ struct scst_device *dev;
+ enum scst_dev_type_threads_pool_type newtpt;
+ struct scst_sysfs_work_item *work;
+ bool stop;
+
+ dev = container_of(kobj, struct scst_device, dev_kobj);
+
+ newtpt = scst_parse_threads_pool_type(buf, count);
+ if (newtpt == SCST_THREADS_POOL_TYPE_INVALID) {
+ PRINT_ERROR("Illegal threads pool type %s", buf);
+ res = -EINVAL;
+ goto out;
+ }
+
+ TRACE_DBG("buf %s, count %zd, newtpt %d", buf, count, newtpt);
+
+ res = scst_dev_sysfs_check_threads_data(dev, dev->threads_num,
+ newtpt, &stop);
+ if ((res != 0) || stop)
+ goto out;
+
+ res = scst_alloc_sysfs_work(scst_dev_sysfs_threads_data_store_work_fn,
+ &work);
+ if (res != 0)
+ goto out;
+
+ work->dev = dev;
+ work->new_threads_num = dev->threads_num;
+ work->new_threads_pool_type = newtpt;
+
+ res = scst_sysfs_queue_wait_work(work);
+ if (res == 0)
+ res = count;
+
+out:
+ return res;
+}
+
+static struct kobj_attribute dev_threads_pool_type_attr =
+ __ATTR(threads_pool_type, S_IRUGO | S_IWUSR,
+ scst_dev_sysfs_threads_pool_type_show,
+ scst_dev_sysfs_threads_pool_type_store);
+
+static struct attribute *scst_dev_attrs[] = {
+ &dev_type_attr.attr,
+ NULL,
+};
+
+static void scst_sysfs_dev_release(struct kobject *kobj)
+{
+ struct scst_device *dev;
+
+ dev = container_of(kobj, struct scst_device, dev_kobj);
+ complete_all(&dev->dev_kobj_release_cmpl);
+ return;
+}
+
+int scst_devt_dev_sysfs_create(struct scst_device *dev)
+{
+ int res = 0;
+ const struct attribute **pattr;
+
+ if (dev->handler == &scst_null_devtype)
+ goto out;
+
+ res = sysfs_create_link(&dev->dev_kobj,
+ &dev->handler->devt_kobj, "handler");
+ if (res != 0) {
+ PRINT_ERROR("Can't create handler link for dev %s",
+ dev->virt_name);
+ goto out;
+ }
+
+ res = sysfs_create_link(&dev->handler->devt_kobj,
+ &dev->dev_kobj, dev->virt_name);
+ if (res != 0) {
+ PRINT_ERROR("Can't create handler link for dev %s",
+ dev->virt_name);
+ goto out_err;
+ }
+
+ if (dev->handler->threads_num >= 0) {
+ res = sysfs_create_file(&dev->dev_kobj,
+ &dev_threads_num_attr.attr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add dev attr %s for dev %s",
+ dev_threads_num_attr.attr.name,
+ dev->virt_name);
+ goto out_err;
+ }
+ res = sysfs_create_file(&dev->dev_kobj,
+ &dev_threads_pool_type_attr.attr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add dev attr %s for dev %s",
+ dev_threads_pool_type_attr.attr.name,
+ dev->virt_name);
+ goto out_err;
+ }
+ }
+
+ pattr = dev->handler->dev_attrs;
+ if (pattr != NULL) {
+ while (*pattr != NULL) {
+ res = sysfs_create_file(&dev->dev_kobj, *pattr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add dev attr %s for dev %s",
+ (*pattr)->name, dev->virt_name);
+ goto out_err;
+ }
+ pattr++;
+ }
+ }
+
+out:
+ return res;
+
+out_err:
+ scst_devt_dev_sysfs_del(dev);
+ goto out;
+}
+
+void scst_devt_dev_sysfs_del(struct scst_device *dev)
+{
+ const struct attribute **pattr;
+
+ if (dev->handler == &scst_null_devtype)
+ goto out;
+
+ pattr = dev->handler->dev_attrs;
+ if (pattr != NULL) {
+ while (*pattr != NULL) {
+ sysfs_remove_file(&dev->dev_kobj, *pattr);
+ pattr++;
+ }
+ }
+
+ sysfs_remove_link(&dev->dev_kobj, "handler");
+ sysfs_remove_link(&dev->handler->devt_kobj, dev->virt_name);
+
+ if (dev->handler->threads_num >= 0) {
+ sysfs_remove_file(&dev->dev_kobj,
+ &dev_threads_num_attr.attr);
+ sysfs_remove_file(&dev->dev_kobj,
+ &dev_threads_pool_type_attr.attr);
+ }
+
+out:
+ return;
+}
+
+static struct kobj_type scst_dev_ktype = {
+ .sysfs_ops = &scst_sysfs_ops,
+ .release = scst_sysfs_dev_release,
+ .default_attrs = scst_dev_attrs,
+};
+
+/*
+ * Must not be called under scst_mutex, because it can call
+ * scst_dev_sysfs_del()
+ */
+int scst_dev_sysfs_create(struct scst_device *dev)
+{
+ int res = 0;
+
+ init_completion(&dev->dev_kobj_release_cmpl);
+
+ res = kobject_init_and_add(&dev->dev_kobj, &scst_dev_ktype,
+ scst_devices_kobj, dev->virt_name);
+ if (res != 0) {
+ PRINT_ERROR("Can't add device %s to sysfs", dev->virt_name);
+ goto out;
+ }
+
+ dev->dev_exp_kobj = kobject_create_and_add("exported",
+ &dev->dev_kobj);
+ if (dev->dev_exp_kobj == NULL) {
+ PRINT_ERROR("Can't create exported link for device %s",
+ dev->virt_name);
+ res = -ENOMEM;
+ goto out_del;
+ }
+
+ if (dev->scsi_dev != NULL) {
+ res = sysfs_create_link(&dev->dev_kobj,
+ &dev->scsi_dev->sdev_dev.kobj, "scsi_device");
+ if (res != 0) {
+ PRINT_ERROR("Can't create scsi_device link for dev %s",
+ dev->virt_name);
+ goto out_del;
+ }
+ }
+
+#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
+ if (dev->scsi_dev == NULL) {
+ res = sysfs_create_file(&dev->dev_kobj,
+ &dev_dump_prs_attr.attr);
+ if (res != 0) {
+ PRINT_ERROR("Can't create attr %s for dev %s",
+ dev_dump_prs_attr.attr.name, dev->virt_name);
+ goto out_del;
+ }
+ }
+#endif
+
+out:
+ return res;
+
+out_del:
+ scst_dev_sysfs_del(dev);
+ goto out;
+}
+
+/*
+ * Must not be called under scst_mutex, due to possible deadlock with
+ * sysfs ref counting in sysfs works (it is waiting for the last put, but
+ * the last ref counter holder is waiting for scst_mutex)
+ */
+void scst_dev_sysfs_del(struct scst_device *dev)
+{
+ int rc;
+
+ kobject_del(dev->dev_exp_kobj);
+ kobject_put(dev->dev_exp_kobj);
+
+ kobject_del(&dev->dev_kobj);
+ kobject_put(&dev->dev_kobj);
+
+ rc = wait_for_completion_timeout(&dev->dev_kobj_release_cmpl, HZ);
+ if (rc == 0) {
+ PRINT_INFO("Waiting for releasing sysfs entry "
+ "for device %s (%d refs)...", dev->virt_name,
+ atomic_read(&dev->dev_kobj.kref.refcount));
+ wait_for_completion(&dev->dev_kobj_release_cmpl);
+ PRINT_INFO("Done waiting for releasing sysfs "
+ "entry for device %s", dev->virt_name);
+ }
+ return;
+}
+
+/**
+ ** Tgt_dev's directory implementation
+ **/
+
+#ifdef CONFIG_SCST_MEASURE_LATENCY
+
+static char *scst_io_size_names[] = {
+ "<=8K ",
+ "<=32K ",
+ "<=128K",
+ "<=512K",
+ ">512K "
+};
+
+static ssize_t scst_tgt_dev_latency_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buffer)
+{
+ int res = 0, i;
+ char buf[50];
+ struct scst_tgt_dev *tgt_dev;
+
+ tgt_dev = container_of(kobj, struct scst_tgt_dev, tgt_dev_kobj);
+
+ for (i = 0; i < SCST_LATENCY_STATS_NUM; i++) {
+ uint64_t scst_time_wr, tgt_time_wr, dev_time_wr;
+ unsigned int processed_cmds_wr;
+ uint64_t scst_time_rd, tgt_time_rd, dev_time_rd;
+ unsigned int processed_cmds_rd;
+ struct scst_ext_latency_stat *latency_stat;
+
+ latency_stat = &tgt_dev->dev_latency_stat[i];
+ scst_time_wr = latency_stat->scst_time_wr;
+ scst_time_rd = latency_stat->scst_time_rd;
+ tgt_time_wr = latency_stat->tgt_time_wr;
+ tgt_time_rd = latency_stat->tgt_time_rd;
+ dev_time_wr = latency_stat->dev_time_wr;
+ dev_time_rd = latency_stat->dev_time_rd;
+ processed_cmds_wr = latency_stat->processed_cmds_wr;
+ processed_cmds_rd = latency_stat->processed_cmds_rd;
+
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-5s %-9s %-15lu ", "Write", scst_io_size_names[i],
+ (unsigned long)processed_cmds_wr);
+ if (processed_cmds_wr == 0)
+ processed_cmds_wr = 1;
+
+ do_div(scst_time_wr, processed_cmds_wr);
+ snprintf(buf, sizeof(buf), "%lu/%lu/%lu/%lu",
+ (unsigned long)latency_stat->min_scst_time_wr,
+ (unsigned long)scst_time_wr,
+ (unsigned long)latency_stat->max_scst_time_wr,
+ (unsigned long)latency_stat->scst_time_wr);
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-47s", buf);
+
+ do_div(tgt_time_wr, processed_cmds_wr);
+ snprintf(buf, sizeof(buf), "%lu/%lu/%lu/%lu",
+ (unsigned long)latency_stat->min_tgt_time_wr,
+ (unsigned long)tgt_time_wr,
+ (unsigned long)latency_stat->max_tgt_time_wr,
+ (unsigned long)latency_stat->tgt_time_wr);
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-47s", buf);
+
+ do_div(dev_time_wr, processed_cmds_wr);
+ snprintf(buf, sizeof(buf), "%lu/%lu/%lu/%lu",
+ (unsigned long)latency_stat->min_dev_time_wr,
+ (unsigned long)dev_time_wr,
+ (unsigned long)latency_stat->max_dev_time_wr,
+ (unsigned long)latency_stat->dev_time_wr);
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-47s\n", buf);
+
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-5s %-9s %-15lu ", "Read", scst_io_size_names[i],
+ (unsigned long)processed_cmds_rd);
+ if (processed_cmds_rd == 0)
+ processed_cmds_rd = 1;
+
+ do_div(scst_time_rd, processed_cmds_rd);
+ snprintf(buf, sizeof(buf), "%lu/%lu/%lu/%lu",
+ (unsigned long)latency_stat->min_scst_time_rd,
+ (unsigned long)scst_time_rd,
+ (unsigned long)latency_stat->max_scst_time_rd,
+ (unsigned long)latency_stat->scst_time_rd);
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-47s", buf);
+
+ do_div(tgt_time_rd, processed_cmds_rd);
+ snprintf(buf, sizeof(buf), "%lu/%lu/%lu/%lu",
+ (unsigned long)latency_stat->min_tgt_time_rd,
+ (unsigned long)tgt_time_rd,
+ (unsigned long)latency_stat->max_tgt_time_rd,
+ (unsigned long)latency_stat->tgt_time_rd);
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-47s", buf);
+
+ do_div(dev_time_rd, processed_cmds_rd);
+ snprintf(buf, sizeof(buf), "%lu/%lu/%lu/%lu",
+ (unsigned long)latency_stat->min_dev_time_rd,
+ (unsigned long)dev_time_rd,
+ (unsigned long)latency_stat->max_dev_time_rd,
+ (unsigned long)latency_stat->dev_time_rd);
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-47s\n", buf);
+ }
+ return res;
+}
+
+static struct kobj_attribute tgt_dev_latency_attr =
+ __ATTR(latency, S_IRUGO,
+ scst_tgt_dev_latency_show, NULL);
+
+#endif /* CONFIG_SCST_MEASURE_LATENCY */
+
+static ssize_t scst_tgt_dev_active_commands_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ int pos = 0;
+ struct scst_tgt_dev *tgt_dev;
+
+ tgt_dev = container_of(kobj, struct scst_tgt_dev, tgt_dev_kobj);
+
+ pos = sprintf(buf, "%d\n", atomic_read(&tgt_dev->tgt_dev_cmd_count));
+
+ return pos;
+}
+
+static struct kobj_attribute tgt_dev_active_commands_attr =
+ __ATTR(active_commands, S_IRUGO,
+ scst_tgt_dev_active_commands_show, NULL);
+
+static struct attribute *scst_tgt_dev_attrs[] = {
+ &tgt_dev_active_commands_attr.attr,
+#ifdef CONFIG_SCST_MEASURE_LATENCY
+ &tgt_dev_latency_attr.attr,
+#endif
+ NULL,
+};
+
+static void scst_sysfs_tgt_dev_release(struct kobject *kobj)
+{
+ struct scst_tgt_dev *tgt_dev;
+
+ tgt_dev = container_of(kobj, struct scst_tgt_dev, tgt_dev_kobj);
+ complete_all(&tgt_dev->tgt_dev_kobj_release_cmpl);
+ return;
+}
+
+static struct kobj_type scst_tgt_dev_ktype = {
+ .sysfs_ops = &scst_sysfs_ops,
+ .release = scst_sysfs_tgt_dev_release,
+ .default_attrs = scst_tgt_dev_attrs,
+};
+
+int scst_tgt_dev_sysfs_create(struct scst_tgt_dev *tgt_dev)
+{
+ int res = 0;
+
+ init_completion(&tgt_dev->tgt_dev_kobj_release_cmpl);
+
+ res = kobject_init_and_add(&tgt_dev->tgt_dev_kobj, &scst_tgt_dev_ktype,
+ &tgt_dev->sess->sess_kobj, "lun%lld",
+ (unsigned long long)tgt_dev->lun);
+ if (res != 0) {
+ PRINT_ERROR("Can't add tgt_dev %lld to sysfs",
+ (unsigned long long)tgt_dev->lun);
+ goto out;
+ }
+
+out:
+ return res;
+}
+
+/*
+ * Called with scst_mutex held.
+ *
+ * !! No sysfs works must use kobject_get() to protect tgt_dev, due to possible
+ * !! deadlock with scst_mutex (it is waiting for the last put, but
+ * !! the last ref counter holder is waiting for scst_mutex)
+ */
+void scst_tgt_dev_sysfs_del(struct scst_tgt_dev *tgt_dev)
+{
+ int rc;
+
+ kobject_del(&tgt_dev->tgt_dev_kobj);
+ kobject_put(&tgt_dev->tgt_dev_kobj);
+
+ rc = wait_for_completion_timeout(
+ &tgt_dev->tgt_dev_kobj_release_cmpl, HZ);
+ if (rc == 0) {
+ PRINT_INFO("Waiting for releasing sysfs entry "
+ "for tgt_dev %lld (%d refs)...",
+ (unsigned long long)tgt_dev->lun,
+ atomic_read(&tgt_dev->tgt_dev_kobj.kref.refcount));
+ wait_for_completion(&tgt_dev->tgt_dev_kobj_release_cmpl);
+ PRINT_INFO("Done waiting for releasing sysfs entry for "
+ "tgt_dev %lld", (unsigned long long)tgt_dev->lun);
+ }
+ return;
+}
+
+/**
+ ** Sessions subdirectory implementation
+ **/
+
+#ifdef CONFIG_SCST_MEASURE_LATENCY
+
+static ssize_t scst_sess_latency_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buffer)
+{
+ ssize_t res = 0;
+ struct scst_session *sess;
+ int i;
+ char buf[50];
+ uint64_t scst_time, tgt_time, dev_time;
+ unsigned int processed_cmds;
+
+ sess = container_of(kobj, struct scst_session, sess_kobj);
+
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-15s %-15s %-46s %-46s %-46s\n",
+ "T-L names", "Total commands", "SCST latency",
+ "Target latency", "Dev latency (min/avg/max/all ns)");
+
+ spin_lock_bh(&sess->lat_lock);
+
+ for (i = 0; i < SCST_LATENCY_STATS_NUM ; i++) {
+ uint64_t scst_time_wr, tgt_time_wr, dev_time_wr;
+ unsigned int processed_cmds_wr;
+ uint64_t scst_time_rd, tgt_time_rd, dev_time_rd;
+ unsigned int processed_cmds_rd;
+ struct scst_ext_latency_stat *latency_stat;
+
+ latency_stat = &sess->sess_latency_stat[i];
+ scst_time_wr = latency_stat->scst_time_wr;
+ scst_time_rd = latency_stat->scst_time_rd;
+ tgt_time_wr = latency_stat->tgt_time_wr;
+ tgt_time_rd = latency_stat->tgt_time_rd;
+ dev_time_wr = latency_stat->dev_time_wr;
+ dev_time_rd = latency_stat->dev_time_rd;
+ processed_cmds_wr = latency_stat->processed_cmds_wr;
+ processed_cmds_rd = latency_stat->processed_cmds_rd;
+
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-5s %-9s %-15lu ",
+ "Write", scst_io_size_names[i],
+ (unsigned long)processed_cmds_wr);
+ if (processed_cmds_wr == 0)
+ processed_cmds_wr = 1;
+
+ do_div(scst_time_wr, processed_cmds_wr);
+ snprintf(buf, sizeof(buf), "%lu/%lu/%lu/%lu",
+ (unsigned long)latency_stat->min_scst_time_wr,
+ (unsigned long)scst_time_wr,
+ (unsigned long)latency_stat->max_scst_time_wr,
+ (unsigned long)latency_stat->scst_time_wr);
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-47s", buf);
+
+ do_div(tgt_time_wr, processed_cmds_wr);
+ snprintf(buf, sizeof(buf), "%lu/%lu/%lu/%lu",
+ (unsigned long)latency_stat->min_tgt_time_wr,
+ (unsigned long)tgt_time_wr,
+ (unsigned long)latency_stat->max_tgt_time_wr,
+ (unsigned long)latency_stat->tgt_time_wr);
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-47s", buf);
+
+ do_div(dev_time_wr, processed_cmds_wr);
+ snprintf(buf, sizeof(buf), "%lu/%lu/%lu/%lu",
+ (unsigned long)latency_stat->min_dev_time_wr,
+ (unsigned long)dev_time_wr,
+ (unsigned long)latency_stat->max_dev_time_wr,
+ (unsigned long)latency_stat->dev_time_wr);
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-47s\n", buf);
+
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-5s %-9s %-15lu ",
+ "Read", scst_io_size_names[i],
+ (unsigned long)processed_cmds_rd);
+ if (processed_cmds_rd == 0)
+ processed_cmds_rd = 1;
+
+ do_div(scst_time_rd, processed_cmds_rd);
+ snprintf(buf, sizeof(buf), "%lu/%lu/%lu/%lu",
+ (unsigned long)latency_stat->min_scst_time_rd,
+ (unsigned long)scst_time_rd,
+ (unsigned long)latency_stat->max_scst_time_rd,
+ (unsigned long)latency_stat->scst_time_rd);
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-47s", buf);
+
+ do_div(tgt_time_rd, processed_cmds_rd);
+ snprintf(buf, sizeof(buf), "%lu/%lu/%lu/%lu",
+ (unsigned long)latency_stat->min_tgt_time_rd,
+ (unsigned long)tgt_time_rd,
+ (unsigned long)latency_stat->max_tgt_time_rd,
+ (unsigned long)latency_stat->tgt_time_rd);
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-47s", buf);
+
+ do_div(dev_time_rd, processed_cmds_rd);
+ snprintf(buf, sizeof(buf), "%lu/%lu/%lu/%lu",
+ (unsigned long)latency_stat->min_dev_time_rd,
+ (unsigned long)dev_time_rd,
+ (unsigned long)latency_stat->max_dev_time_rd,
+ (unsigned long)latency_stat->dev_time_rd);
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-47s\n", buf);
+ }
+
+ scst_time = sess->scst_time;
+ tgt_time = sess->tgt_time;
+ dev_time = sess->dev_time;
+ processed_cmds = sess->processed_cmds;
+
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "\n%-15s %-16d", "Overall ", processed_cmds);
+
+ if (processed_cmds == 0)
+ processed_cmds = 1;
+
+ do_div(scst_time, processed_cmds);
+ snprintf(buf, sizeof(buf), "%lu/%lu/%lu/%lu",
+ (unsigned long)sess->min_scst_time,
+ (unsigned long)scst_time,
+ (unsigned long)sess->max_scst_time,
+ (unsigned long)sess->scst_time);
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-47s", buf);
+
+ do_div(tgt_time, processed_cmds);
+ snprintf(buf, sizeof(buf), "%lu/%lu/%lu/%lu",
+ (unsigned long)sess->min_tgt_time,
+ (unsigned long)tgt_time,
+ (unsigned long)sess->max_tgt_time,
+ (unsigned long)sess->tgt_time);
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-47s", buf);
+
+ do_div(dev_time, processed_cmds);
+ snprintf(buf, sizeof(buf), "%lu/%lu/%lu/%lu",
+ (unsigned long)sess->min_dev_time,
+ (unsigned long)dev_time,
+ (unsigned long)sess->max_dev_time,
+ (unsigned long)sess->dev_time);
+ res += scnprintf(&buffer[res], SCST_SYSFS_BLOCK_SIZE - res,
+ "%-47s\n\n", buf);
+
+ spin_unlock_bh(&sess->lat_lock);
+ return res;
+}
+
+static int scst_sess_zero_latency(struct scst_sysfs_work_item *work)
+{
+ int res = 0, t;
+ struct scst_session *sess = work->sess;
+
+ if (mutex_lock_interruptible(&scst_mutex) != 0) {
+ res = -EINTR;
+ goto out_put;
+ }
+
+ PRINT_INFO("Zeroing latency statistics for initiator "
+ "%s", sess->initiator_name);
+
+ spin_lock_bh(&sess->lat_lock);
+
+ sess->scst_time = 0;
+ sess->tgt_time = 0;
+ sess->dev_time = 0;
+ sess->min_scst_time = 0;
+ sess->min_tgt_time = 0;
+ sess->min_dev_time = 0;
+ sess->max_scst_time = 0;
+ sess->max_tgt_time = 0;
+ sess->max_dev_time = 0;
+ sess->processed_cmds = 0;
+ memset(sess->sess_latency_stat, 0,
+ sizeof(sess->sess_latency_stat));
+
+ for (t = TGT_DEV_HASH_SIZE-1; t >= 0; t--) {
+ struct list_head *sess_tgt_dev_list_head =
+ &sess->sess_tgt_dev_list_hash[t];
+ struct scst_tgt_dev *tgt_dev;
+ list_for_each_entry(tgt_dev, sess_tgt_dev_list_head,
+ sess_tgt_dev_list_entry) {
+ tgt_dev->scst_time = 0;
+ tgt_dev->tgt_time = 0;
+ tgt_dev->dev_time = 0;
+ tgt_dev->processed_cmds = 0;
+ memset(tgt_dev->dev_latency_stat, 0,
+ sizeof(tgt_dev->dev_latency_stat));
+ }
+ }
+
+ spin_unlock_bh(&sess->lat_lock);
+
+ mutex_unlock(&scst_mutex);
+
+out_put:
+ kobject_put(&sess->sess_kobj);
+ return res;
+}
+
+static ssize_t scst_sess_latency_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ int res;
+ struct scst_session *sess;
+ struct scst_sysfs_work_item *work;
+
+ sess = container_of(kobj, struct scst_session, sess_kobj);
+
+ res = scst_alloc_sysfs_work(scst_sess_zero_latency, &work);
+ if (res != 0)
+ goto out;
+
+ work->sess = sess;
+
+ kobject_get(&sess->sess_kobj);
+
+ res = scst_sysfs_queue_wait_work(work);
+ if (res == 0)
+ res = count;
+
+out:
+ return res;
+}
+
+static struct kobj_attribute session_latency_attr =
+ __ATTR(latency, S_IRUGO | S_IWUSR, scst_sess_latency_show,
+ scst_sess_latency_store);
+
+#endif /* CONFIG_SCST_MEASURE_LATENCY */
+
+static ssize_t scst_sess_sysfs_commands_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct scst_session *sess;
+
+ sess = container_of(kobj, struct scst_session, sess_kobj);
+
+ return sprintf(buf, "%i\n", atomic_read(&sess->sess_cmd_count));
+}
+
+static struct kobj_attribute session_commands_attr =
+ __ATTR(commands, S_IRUGO, scst_sess_sysfs_commands_show, NULL);
+
+static int scst_sysfs_sess_get_active_commands(struct scst_session *sess)
+{
+ int res;
+ int active_cmds = 0, t;
+
+ if (mutex_lock_interruptible(&scst_mutex) != 0) {
+ res = -EINTR;
+ goto out_put;
+ }
+
+ for (t = TGT_DEV_HASH_SIZE-1; t >= 0; t--) {
+ struct list_head *sess_tgt_dev_list_head =
+ &sess->sess_tgt_dev_list_hash[t];
+ struct scst_tgt_dev *tgt_dev;
+ list_for_each_entry(tgt_dev, sess_tgt_dev_list_head,
+ sess_tgt_dev_list_entry) {
+ active_cmds += atomic_read(&tgt_dev->tgt_dev_cmd_count);
+ }
+ }
+
+ mutex_unlock(&scst_mutex);
+
+ res = active_cmds;
+
+out_put:
+ kobject_put(&sess->sess_kobj);
+ return res;
+}
+
+static int scst_sysfs_sess_get_active_commands_work_fn(struct scst_sysfs_work_item *work)
+{
+ return scst_sysfs_sess_get_active_commands(work->sess);
+}
+
+static ssize_t scst_sess_sysfs_active_commands_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ int res;
+ struct scst_session *sess;
+ struct scst_sysfs_work_item *work;
+
+ sess = container_of(kobj, struct scst_session, sess_kobj);
+
+ res = scst_alloc_sysfs_work(scst_sysfs_sess_get_active_commands_work_fn,
+ &work);
+ if (res != 0)
+ goto out;
+
+ work->sess = sess;
+
+ kobject_get(&sess->sess_kobj);
+
+ res = scst_sysfs_queue_wait_work(work);
+ if (res != -EAGAIN)
+ res = sprintf(buf, "%i\n", res);
+
+out:
+ return res;
+}
+
+static struct kobj_attribute session_active_commands_attr =
+ __ATTR(active_commands, S_IRUGO, scst_sess_sysfs_active_commands_show,
+ NULL);
+
+static ssize_t scst_sess_sysfs_initiator_name_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct scst_session *sess;
+
+ sess = container_of(kobj, struct scst_session, sess_kobj);
+
+ return scnprintf(buf, SCST_SYSFS_BLOCK_SIZE, "%s\n",
+ sess->initiator_name);
+}
+
+static struct kobj_attribute session_initiator_name_attr =
+ __ATTR(initiator_name, S_IRUGO, scst_sess_sysfs_initiator_name_show, NULL);
+
+static struct attribute *scst_session_attrs[] = {
+ &session_commands_attr.attr,
+ &session_active_commands_attr.attr,
+ &session_initiator_name_attr.attr,
+#ifdef CONFIG_SCST_MEASURE_LATENCY
+ &session_latency_attr.attr,
+#endif /* CONFIG_SCST_MEASURE_LATENCY */
+ NULL,
+};
+
+static void scst_sysfs_session_release(struct kobject *kobj)
+{
+ struct scst_session *sess;
+
+ sess = container_of(kobj, struct scst_session, sess_kobj);
+ complete_all(&sess->sess_kobj_release_cmpl);
+ return;
+}
+
+static struct kobj_type scst_session_ktype = {
+ .sysfs_ops = &scst_sysfs_ops,
+ .release = scst_sysfs_session_release,
+ .default_attrs = scst_session_attrs,
+};
+
+static int scst_create_sess_luns_link(struct scst_session *sess)
+{
+ int res;
+
+ /*
+ * No locks are needed, because sess supposed to be in acg->acg_sess_list
+ * and tgt->sess_list, so blocking them from disappearing.
+ */
+
+ if (sess->acg == sess->tgt->default_acg)
+ res = sysfs_create_link(&sess->sess_kobj,
+ sess->tgt->tgt_luns_kobj, "luns");
+ else
+ res = sysfs_create_link(&sess->sess_kobj,
+ sess->acg->luns_kobj, "luns");
+
+ if (res != 0)
+ PRINT_ERROR("Can't create luns link for initiator %s",
+ sess->initiator_name);
+
+ return res;
+}
+
+int scst_recreate_sess_luns_link(struct scst_session *sess)
+{
+ sysfs_remove_link(&sess->sess_kobj, "luns");
+ return scst_create_sess_luns_link(sess);
+}
+
+/* Supposed to be called under scst_mutex */
+int scst_sess_sysfs_create(struct scst_session *sess)
+{
+ int res = 0;
+ struct scst_session *s;
+ const struct attribute **pattr;
+ char *name = (char *)sess->initiator_name;
+ int len = strlen(name) + 1, n = 1;
+
+restart:
+ list_for_each_entry(s, &sess->tgt->sess_list, sess_list_entry) {
+ if (!s->sess_kobj_ready)
+ continue;
+
+ if (strcmp(name, kobject_name(&s->sess_kobj)) == 0) {
+ if (s == sess)
+ continue;
+
+ TRACE_DBG("Dublicated session from the same initiator "
+ "%s found", name);
+
+ if (name == sess->initiator_name) {
+ len = strlen(sess->initiator_name);
+ len += 20;
+ name = kmalloc(len, GFP_KERNEL);
+ if (name == NULL) {
+ PRINT_ERROR("Unable to allocate a "
+ "replacement name (size %d)",
+ len);
+ }
+ }
+
+ snprintf(name, len, "%s_%d", sess->initiator_name, n);
+ n++;
+ goto restart;
+ }
+ }
+
+ init_completion(&sess->sess_kobj_release_cmpl);
+
+ TRACE_DBG("Adding session %s to sysfs", name);
+
+ res = kobject_init_and_add(&sess->sess_kobj, &scst_session_ktype,
+ sess->tgt->tgt_sess_kobj, name);
+ if (res != 0) {
+ PRINT_ERROR("Can't add session %s to sysfs", name);
+ goto out_free;
+ }
+
+ sess->sess_kobj_ready = 1;
+
+ pattr = sess->tgt->tgtt->sess_attrs;
+ if (pattr != NULL) {
+ while (*pattr != NULL) {
+ res = sysfs_create_file(&sess->sess_kobj, *pattr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add sess attr %s for sess "
+ "for initiator %s", (*pattr)->name,
+ name);
+ goto out_free;
+ }
+ pattr++;
+ }
+ }
+
+ res = scst_create_sess_luns_link(sess);
+
+out_free:
+ if (name != sess->initiator_name)
+ kfree(name);
+ return res;
+}
+
+/*
+ * Must not be called under scst_mutex, due to possible deadlock with
+ * sysfs ref counting in sysfs works (it is waiting for the last put, but
+ * the last ref counter holder is waiting for scst_mutex)
+ */
+void scst_sess_sysfs_del(struct scst_session *sess)
+{
+ int rc;
+
+ if (!sess->sess_kobj_ready)
+ goto out;
+
+ TRACE_DBG("Deleting session %s from sysfs",
+ kobject_name(&sess->sess_kobj));
+
+ kobject_del(&sess->sess_kobj);
+ kobject_put(&sess->sess_kobj);
+
+ rc = wait_for_completion_timeout(&sess->sess_kobj_release_cmpl, HZ);
+ if (rc == 0) {
+ PRINT_INFO("Waiting for releasing sysfs entry "
+ "for session from %s (%d refs)...", sess->initiator_name,
+ atomic_read(&sess->sess_kobj.kref.refcount));
+ wait_for_completion(&sess->sess_kobj_release_cmpl);
+ PRINT_INFO("Done waiting for releasing sysfs "
+ "entry for session %s", sess->initiator_name);
+ }
+
+out:
+ return;
+}
+
+/**
+ ** Target luns directory implementation
+ **/
+
+static void scst_acg_dev_release(struct kobject *kobj)
+{
+ struct scst_acg_dev *acg_dev;
+
+ acg_dev = container_of(kobj, struct scst_acg_dev, acg_dev_kobj);
+ complete_all(&acg_dev->acg_dev_kobj_release_cmpl);
+ return;
+}
+
+static ssize_t scst_lun_rd_only_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ struct scst_acg_dev *acg_dev;
+
+ acg_dev = container_of(kobj, struct scst_acg_dev, acg_dev_kobj);
+
+ if (acg_dev->rd_only || acg_dev->dev->rd_only)
+ return sprintf(buf, "%d\n%s\n", 1, SCST_SYSFS_KEY_MARK);
+ else
+ return sprintf(buf, "%d\n", 0);
+}
+
+static struct kobj_attribute lun_options_attr =
+ __ATTR(read_only, S_IRUGO, scst_lun_rd_only_show, NULL);
+
+static struct attribute *lun_attrs[] = {
+ &lun_options_attr.attr,
+ NULL,
+};
+
+static struct kobj_type acg_dev_ktype = {
+ .sysfs_ops = &scst_sysfs_ops,
+ .release = scst_acg_dev_release,
+ .default_attrs = lun_attrs,
+};
+
+/*
+ * Called with scst_mutex held.
+ *
+ * !! No sysfs works must use kobject_get() to protect acg_dev, due to possible
+ * !! deadlock with scst_mutex (it is waiting for the last put, but
+ * !! the last ref counter holder is waiting for scst_mutex)
+ */
+void scst_acg_dev_sysfs_del(struct scst_acg_dev *acg_dev)
+{
+ int rc;
+
+ if (acg_dev->dev != NULL) {
+ sysfs_remove_link(acg_dev->dev->dev_exp_kobj,
+ acg_dev->acg_dev_link_name);
+ kobject_put(&acg_dev->dev->dev_kobj);
+ }
+
+ kobject_del(&acg_dev->acg_dev_kobj);
+ kobject_put(&acg_dev->acg_dev_kobj);
+
+ rc = wait_for_completion_timeout(&acg_dev->acg_dev_kobj_release_cmpl, HZ);
+ if (rc == 0) {
+ PRINT_INFO("Waiting for releasing sysfs entry "
+ "for acg_dev %p (%d refs)...", acg_dev,
+ atomic_read(&acg_dev->acg_dev_kobj.kref.refcount));
+ wait_for_completion(&acg_dev->acg_dev_kobj_release_cmpl);
+ PRINT_INFO("Done waiting for releasing sysfs "
+ "entry for acg_dev %p", acg_dev);
+ }
+ return;
+}
+
+int scst_acg_dev_sysfs_create(struct scst_acg_dev *acg_dev,
+ struct kobject *parent)
+{
+ int res;
+
+ init_completion(&acg_dev->acg_dev_kobj_release_cmpl);
+
+ res = kobject_init_and_add(&acg_dev->acg_dev_kobj, &acg_dev_ktype,
+ parent, "%u", acg_dev->lun);
+ if (res != 0) {
+ PRINT_ERROR("Can't add acg_dev %p to sysfs", acg_dev);
+ goto out;
+ }
+
+ kobject_get(&acg_dev->dev->dev_kobj);
+
+ snprintf(acg_dev->acg_dev_link_name, sizeof(acg_dev->acg_dev_link_name),
+ "export%u", acg_dev->dev->dev_exported_lun_num++);
+
+ res = sysfs_create_link(acg_dev->dev->dev_exp_kobj,
+ &acg_dev->acg_dev_kobj, acg_dev->acg_dev_link_name);
+ if (res != 0) {
+ PRINT_ERROR("Can't create acg %s LUN link",
+ acg_dev->acg->acg_name);
+ goto out_del;
+ }
+
+ res = sysfs_create_link(&acg_dev->acg_dev_kobj,
+ &acg_dev->dev->dev_kobj, "device");
+ if (res != 0) {
+ PRINT_ERROR("Can't create acg %s device link",
+ acg_dev->acg->acg_name);
+ goto out_del;
+ }
+
+out:
+ return res;
+
+out_del:
+ scst_acg_dev_sysfs_del(acg_dev);
+ goto out;
+}
+
+static int __scst_process_luns_mgmt_store(char *buffer,
+ struct scst_tgt *tgt, struct scst_acg *acg, bool tgt_kobj)
+{
+ int res, read_only = 0, action;
+ char *p, *e = NULL;
+ unsigned int virt_lun;
+ struct scst_acg_dev *acg_dev = NULL, *acg_dev_tmp;
+ struct scst_device *d, *dev = NULL;
+
+#define SCST_LUN_ACTION_ADD 1
+#define SCST_LUN_ACTION_DEL 2
+#define SCST_LUN_ACTION_REPLACE 3
+#define SCST_LUN_ACTION_CLEAR 4
+
+ TRACE_DBG("buffer %s", buffer);
+
+ p = buffer;
+ if (p[strlen(p) - 1] == '\n')
+ p[strlen(p) - 1] = '\0';
+ if (strncasecmp("add", p, 3) == 0) {
+ p += 3;
+ action = SCST_LUN_ACTION_ADD;
+ } else if (strncasecmp("del", p, 3) == 0) {
+ p += 3;
+ action = SCST_LUN_ACTION_DEL;
+ } else if (!strncasecmp("replace", p, 7)) {
+ p += 7;
+ action = SCST_LUN_ACTION_REPLACE;
+ } else if (!strncasecmp("clear", p, 5)) {
+ p += 5;
+ action = SCST_LUN_ACTION_CLEAR;
+ } else {
+ PRINT_ERROR("Unknown action \"%s\"", p);
+ res = -EINVAL;
+ goto out;
+ }
+
+ res = scst_suspend_activity(true);
+ if (res != 0)
+ goto out;
+
+ if (mutex_lock_interruptible(&scst_mutex) != 0) {
+ res = -EINTR;
+ goto out_resume;
+ }
+
+ /* Check if tgt and acg not already freed while we were coming here */
+ if (scst_check_tgt_acg_ptrs(tgt, acg) != 0)
+ goto out_unlock;
+
+ if ((action != SCST_LUN_ACTION_CLEAR) &&
+ (action != SCST_LUN_ACTION_DEL)) {
+ if (!isspace(*p)) {
+ PRINT_ERROR("%s", "Syntax error");
+ res = -EINVAL;
+ goto out_unlock;
+ }
+
+ while (isspace(*p) && *p != '\0')
+ p++;
+ e = p; /* save p */
+ while (!isspace(*e) && *e != '\0')
+ e++;
+ *e = '\0';
+
+ list_for_each_entry(d, &scst_dev_list, dev_list_entry) {
+ if (!strcmp(d->virt_name, p)) {
+ dev = d;
+ TRACE_DBG("Device %p (%s) found", dev, p);
+ break;
+ }
+ }
+ if (dev == NULL) {
+ PRINT_ERROR("Device '%s' not found", p);
+ res = -EINVAL;
+ goto out_unlock;
+ }
+ }
+
+ switch (action) {
+ case SCST_LUN_ACTION_ADD:
+ case SCST_LUN_ACTION_REPLACE:
+ {
+ bool dev_replaced = false;
+
+ e++;
+ while (isspace(*e) && *e != '\0')
+ e++;
+ virt_lun = simple_strtoul(e, &e, 0);
+
+ while (isspace(*e) && *e != '\0')
+ e++;
+
+ while (1) {
+ char *pp;
+ unsigned long val;
+ char *param = scst_get_next_token_str(&e);
+ if (param == NULL)
+ break;
+
+ p = scst_get_next_lexem(¶m);
+ if (*p == '\0') {
+ PRINT_ERROR("Syntax error at %s (device %s)",
+ param, dev->virt_name);
+ res = -EINVAL;
+ goto out_unlock;
+ }
+
+ pp = scst_get_next_lexem(¶m);
+ if (*pp == '\0') {
+ PRINT_ERROR("Parameter %s value missed for device %s",
+ p, dev->virt_name);
+ res = -EINVAL;
+ goto out_unlock;
+ }
+
+ if (scst_get_next_lexem(¶m)[0] != '\0') {
+ PRINT_ERROR("Too many parameter's %s values (device %s)",
+ p, dev->virt_name);
+ res = -EINVAL;
+ goto out_unlock;
+ }
+
+ res = strict_strtoul(pp, 0, &val);
+ if (res != 0) {
+ PRINT_ERROR("strict_strtoul() for %s failed: %d "
+ "(device %s)", pp, res, dev->virt_name);
+ goto out_unlock;
+ }
+
+ if (!strcasecmp("read_only", p)) {
+ read_only = val;
+ TRACE_DBG("READ ONLY %d", read_only);
+ } else {
+ PRINT_ERROR("Unknown parameter %s (device %s)",
+ p, dev->virt_name);
+ res = -EINVAL;
+ goto out_unlock;
+ }
+ }
+
+ acg_dev = NULL;
+ list_for_each_entry(acg_dev_tmp, &acg->acg_dev_list,
+ acg_dev_list_entry) {
+ if (acg_dev_tmp->lun == virt_lun) {
+ acg_dev = acg_dev_tmp;
+ break;
+ }
+ }
+
+ if (acg_dev != NULL) {
+ if (action == SCST_LUN_ACTION_ADD) {
+ PRINT_ERROR("virt lun %d already exists in "
+ "group %s", virt_lun, acg->acg_name);
+ res = -EEXIST;
+ goto out_unlock;
+ } else {
+ /* Replace */
+ res = scst_acg_del_lun(acg, acg_dev->lun,
+ false);
+ if (res != 0)
+ goto out_unlock;
+
+ dev_replaced = true;
+ }
+ }
+
+ res = scst_acg_add_lun(acg,
+ tgt_kobj ? tgt->tgt_luns_kobj : acg->luns_kobj,
+ dev, virt_lun, read_only, !dev_replaced, NULL);
+ if (res != 0)
+ goto out_unlock;
+
+ if (dev_replaced) {
+ struct scst_tgt_dev *tgt_dev;
+
+ list_for_each_entry(tgt_dev, &dev->dev_tgt_dev_list,
+ dev_tgt_dev_list_entry) {
+ if ((tgt_dev->acg_dev->acg == acg) &&
+ (tgt_dev->lun == virt_lun)) {
+ TRACE_MGMT_DBG("INQUIRY DATA HAS CHANGED"
+ " on tgt_dev %p", tgt_dev);
+ scst_gen_aen_or_ua(tgt_dev,
+ SCST_LOAD_SENSE(scst_sense_inquery_data_changed));
+ }
+ }
+ }
+
+ break;
+ }
+ case SCST_LUN_ACTION_DEL:
+ while (isspace(*p) && *p != '\0')
+ p++;
+ virt_lun = simple_strtoul(p, &p, 0);
+
+ res = scst_acg_del_lun(acg, virt_lun, true);
+ if (res != 0)
+ goto out_unlock;
+ break;
+ case SCST_LUN_ACTION_CLEAR:
+ PRINT_INFO("Removed all devices from group %s",
+ acg->acg_name);
+ list_for_each_entry_safe(acg_dev, acg_dev_tmp,
+ &acg->acg_dev_list,
+ acg_dev_list_entry) {
+ res = scst_acg_del_lun(acg, acg_dev->lun,
+ list_is_last(&acg_dev->acg_dev_list_entry,
+ &acg->acg_dev_list));
+ if (res)
+ goto out_unlock;
+ }
+ break;
+ }
+
+ res = 0;
+
+out_unlock:
+ mutex_unlock(&scst_mutex);
+
+out_resume:
+ scst_resume_activity();
+
+out:
+ return res;
+
+#undef SCST_LUN_ACTION_ADD
+#undef SCST_LUN_ACTION_DEL
+#undef SCST_LUN_ACTION_REPLACE
+#undef SCST_LUN_ACTION_CLEAR
+}
+
+static int scst_luns_mgmt_store_work_fn(struct scst_sysfs_work_item *work)
+{
+ return __scst_process_luns_mgmt_store(work->buf, work->tgt, work->acg,
+ work->is_tgt_kobj);
+}
+
+static ssize_t __scst_acg_mgmt_store(struct scst_acg *acg,
+ const char *buf, size_t count, bool is_tgt_kobj,
+ int (*sysfs_work_fn)(struct scst_sysfs_work_item *))
+{
+ int res;
+ char *buffer;
+ struct scst_sysfs_work_item *work;
+
+ buffer = kzalloc(count+1, GFP_KERNEL);
+ if (buffer == NULL) {
+ res = -ENOMEM;
+ goto out;
+ }
+ memcpy(buffer, buf, count);
+ buffer[count] = '\0';
+
+ res = scst_alloc_sysfs_work(sysfs_work_fn, &work);
+ if (res != 0)
+ goto out_free;
+
+ work->buf = buffer;
+ work->tgt = acg->tgt;
+ work->acg = acg;
+ work->is_tgt_kobj = is_tgt_kobj;
+
+ res = scst_sysfs_queue_wait_work(work);
+ if (res == 0)
+ res = count;
+
+out:
+ return res;
+
+out_free:
+ kfree(buffer);
+ goto out;
+}
+
+static ssize_t __scst_luns_mgmt_store(struct scst_acg *acg,
+ bool tgt_kobj, const char *buf, size_t count)
+{
+ return __scst_acg_mgmt_store(acg, buf, count, tgt_kobj,
+ scst_luns_mgmt_store_work_fn);
+}
+
+static ssize_t scst_luns_mgmt_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ static char *help = "Usage: echo \"add|del H:C:I:L lun [parameters]\" >mgmt\n"
+ " echo \"add VNAME lun [parameters]\" >mgmt\n"
+ " echo \"del lun\" >mgmt\n"
+ " echo \"replace H:C:I:L lun [parameters]\" >mgmt\n"
+ " echo \"replace VNAME lun [parameters]\" >mgmt\n"
+ " echo \"clear\" >mgmt\n"
+ "\n"
+ "where parameters are one or more "
+ "param_name=value pairs separated by ';'\n"
+ "\nThe following parameters available: read_only.";
+
+ return sprintf(buf, "%s", help);
+}
+
+static ssize_t scst_luns_mgmt_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count)
+{
+ int res;
+ struct scst_acg *acg;
+ struct scst_tgt *tgt;
+
+ tgt = container_of(kobj->parent, struct scst_tgt, tgt_kobj);
+ acg = tgt->default_acg;
+
+ res = __scst_luns_mgmt_store(acg, true, buf, count);
+ return res;
+}
+
+static ssize_t __scst_acg_addr_method_show(struct scst_acg *acg, char *buf)
+{
+ int res;
+
+ switch (acg->addr_method) {
+ case SCST_LUN_ADDR_METHOD_FLAT:
+ res = sprintf(buf, "FLAT\n%s\n", SCST_SYSFS_KEY_MARK);
+ break;
+ case SCST_LUN_ADDR_METHOD_PERIPHERAL:
+ res = sprintf(buf, "PERIPHERAL\n");
+ break;
+ default:
+ res = sprintf(buf, "UNKNOWN\n");
+ break;
+ }
+
+ return res;
+}
+
+static ssize_t __scst_acg_addr_method_store(struct scst_acg *acg,
+ const char *buf, size_t count)
+{
+ int res = count;
+
+ if (strncasecmp(buf, "FLAT", min_t(int, 4, count)) == 0)
+ acg->addr_method = SCST_LUN_ADDR_METHOD_FLAT;
+ else if (strncasecmp(buf, "PERIPHERAL", min_t(int, 10, count)) == 0)
+ acg->addr_method = SCST_LUN_ADDR_METHOD_PERIPHERAL;
+ else {
+ PRINT_ERROR("Unknown address method %s", buf);
+ res = -EINVAL;
+ }
+
+ TRACE_DBG("acg %p, addr_method %d", acg, acg->addr_method);
+
+ return res;
+}
+
+static ssize_t scst_tgt_addr_method_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct scst_acg *acg;
+ struct scst_tgt *tgt;
+
+ tgt = container_of(kobj, struct scst_tgt, tgt_kobj);
+ acg = tgt->default_acg;
+
+ return __scst_acg_addr_method_show(acg, buf);
+}
+
+static ssize_t scst_tgt_addr_method_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ int res;
+ struct scst_acg *acg;
+ struct scst_tgt *tgt;
+
+ tgt = container_of(kobj, struct scst_tgt, tgt_kobj);
+ acg = tgt->default_acg;
+
+ res = __scst_acg_addr_method_store(acg, buf, count);
+ return res;
+}
+
+static ssize_t __scst_acg_io_grouping_type_show(struct scst_acg *acg, char *buf)
+{
+ int res;
+
+ switch (acg->acg_io_grouping_type) {
+ case SCST_IO_GROUPING_AUTO:
+ res = sprintf(buf, "%s\n", SCST_IO_GROUPING_AUTO_STR);
+ break;
+ case SCST_IO_GROUPING_THIS_GROUP_ONLY:
+ res = sprintf(buf, "%s\n%s\n",
+ SCST_IO_GROUPING_THIS_GROUP_ONLY_STR,
+ SCST_SYSFS_KEY_MARK);
+ break;
+ case SCST_IO_GROUPING_NEVER:
+ res = sprintf(buf, "%s\n%s\n", SCST_IO_GROUPING_NEVER_STR,
+ SCST_SYSFS_KEY_MARK);
+ break;
+ default:
+ res = sprintf(buf, "%d\n%s\n", acg->acg_io_grouping_type,
+ SCST_SYSFS_KEY_MARK);
+ break;
+ }
+
+ return res;
+}
+
+static int __scst_acg_process_io_grouping_type_store(struct scst_tgt *tgt,
+ struct scst_acg *acg, int io_grouping_type)
+{
+ int res = 0;
+ struct scst_acg_dev *acg_dev;
+
+ TRACE_DBG("tgt %p, acg %p, io_grouping_type %d", tgt, acg,
+ io_grouping_type);
+
+ res = scst_suspend_activity(true);
+ if (res != 0)
+ goto out;
+
+ if (mutex_lock_interruptible(&scst_mutex) != 0) {
+ res = -EINTR;
+ goto out_resume;
+ }
+
+ /* Check if tgt and acg not already freed while we were coming here */
+ if (scst_check_tgt_acg_ptrs(tgt, acg) != 0)
+ goto out_unlock;
+
+ acg->acg_io_grouping_type = io_grouping_type;
+
+ list_for_each_entry(acg_dev, &acg->acg_dev_list, acg_dev_list_entry) {
+ int rc;
+
+ scst_stop_dev_threads(acg_dev->dev);
+
+ rc = scst_create_dev_threads(acg_dev->dev);
+ if (rc != 0)
+ res = rc;
+ }
+
+out_unlock:
+ mutex_unlock(&scst_mutex);
+
+out_resume:
+ scst_resume_activity();
+
+out:
+ return res;
+}
+
+static int __scst_acg_io_grouping_type_store_work_fn(struct scst_sysfs_work_item *work)
+{
+ return __scst_acg_process_io_grouping_type_store(work->tgt, work->acg,
+ work->io_grouping_type);
+}
+
+static ssize_t __scst_acg_io_grouping_type_store(struct scst_acg *acg,
+ const char *buf, size_t count)
+{
+ int res = 0;
+ int prev = acg->acg_io_grouping_type;
+ long io_grouping_type;
+ struct scst_sysfs_work_item *work;
+
+ if (strncasecmp(buf, SCST_IO_GROUPING_AUTO_STR,
+ min_t(int, strlen(SCST_IO_GROUPING_AUTO_STR), count)) == 0)
+ io_grouping_type = SCST_IO_GROUPING_AUTO;
+ else if (strncasecmp(buf, SCST_IO_GROUPING_THIS_GROUP_ONLY_STR,
+ min_t(int, strlen(SCST_IO_GROUPING_THIS_GROUP_ONLY_STR), count)) == 0)
+ io_grouping_type = SCST_IO_GROUPING_THIS_GROUP_ONLY;
+ else if (strncasecmp(buf, SCST_IO_GROUPING_NEVER_STR,
+ min_t(int, strlen(SCST_IO_GROUPING_NEVER_STR), count)) == 0)
+ io_grouping_type = SCST_IO_GROUPING_NEVER;
+ else {
+ res = strict_strtol(buf, 0, &io_grouping_type);
+ if ((res != 0) || (io_grouping_type <= 0)) {
+ PRINT_ERROR("Unknown or not allowed I/O grouping type "
+ "%s", buf);
+ res = -EINVAL;
+ goto out;
+ }
+ }
+
+ if (prev == io_grouping_type)
+ goto out;
+
+ res = scst_alloc_sysfs_work(__scst_acg_io_grouping_type_store_work_fn,
+ &work);
+ if (res != 0)
+ goto out;
+
+ work->tgt = acg->tgt;
+ work->acg = acg;
+ work->io_grouping_type = io_grouping_type;
+
+ res = scst_sysfs_queue_wait_work(work);
+
+out:
+ return res;
+}
+
+static ssize_t scst_tgt_io_grouping_type_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct scst_acg *acg;
+ struct scst_tgt *tgt;
+
+ tgt = container_of(kobj, struct scst_tgt, tgt_kobj);
+ acg = tgt->default_acg;
+
+ return __scst_acg_io_grouping_type_show(acg, buf);
+}
+
+static ssize_t scst_tgt_io_grouping_type_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ int res;
+ struct scst_acg *acg;
+ struct scst_tgt *tgt;
+
+ tgt = container_of(kobj, struct scst_tgt, tgt_kobj);
+ acg = tgt->default_acg;
+
+ res = __scst_acg_io_grouping_type_store(acg, buf, count);
+ if (res != 0)
+ goto out;
+
+ res = count;
+
+out:
+ return res;
+}
+
+/*
+ * Called with scst_mutex held.
+ *
+ * !! No sysfs works must use kobject_get() to protect acg, due to possible
+ * !! deadlock with scst_mutex (it is waiting for the last put, but
+ * !! the last ref counter holder is waiting for scst_mutex)
+ */
+void scst_acg_sysfs_del(struct scst_acg *acg)
+{
+ int rc;
+
+ kobject_del(acg->luns_kobj);
+ kobject_put(acg->luns_kobj);
+
+ kobject_del(acg->initiators_kobj);
+ kobject_put(acg->initiators_kobj);
+
+ kobject_del(&acg->acg_kobj);
+ kobject_put(&acg->acg_kobj);
+
+ rc = wait_for_completion_timeout(&acg->acg_kobj_release_cmpl, HZ);
+ if (rc == 0) {
+ PRINT_INFO("Waiting for releasing sysfs entry "
+ "for acg %s (%d refs)...", acg->acg_name,
+ atomic_read(&acg->acg_kobj.kref.refcount));
+ wait_for_completion(&acg->acg_kobj_release_cmpl);
+ PRINT_INFO("Done waiting for releasing sysfs "
+ "entry for acg %s", acg->acg_name);
+ }
+ return;
+}
+
+int scst_acg_sysfs_create(struct scst_tgt *tgt,
+ struct scst_acg *acg)
+{
+ int res = 0;
+
+ init_completion(&acg->acg_kobj_release_cmpl);
+
+ res = kobject_init_and_add(&acg->acg_kobj, &acg_ktype,
+ tgt->tgt_ini_grp_kobj, acg->acg_name);
+ if (res != 0) {
+ PRINT_ERROR("Can't add acg '%s' to sysfs", acg->acg_name);
+ goto out;
+ }
+
+ acg->luns_kobj = kobject_create_and_add("luns", &acg->acg_kobj);
+ if (acg->luns_kobj == NULL) {
+ PRINT_ERROR("Can't create luns kobj for tgt %s",
+ tgt->tgt_name);
+ res = -ENOMEM;
+ goto out_del;
+ }
+
+ res = sysfs_create_file(acg->luns_kobj, &scst_acg_luns_mgmt.attr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add tgt attr %s for tgt %s",
+ scst_acg_luns_mgmt.attr.name, tgt->tgt_name);
+ goto out_del;
+ }
+
+ acg->initiators_kobj = kobject_create_and_add("initiators",
+ &acg->acg_kobj);
+ if (acg->initiators_kobj == NULL) {
+ PRINT_ERROR("Can't create initiators kobj for tgt %s",
+ tgt->tgt_name);
+ res = -ENOMEM;
+ goto out_del;
+ }
+
+ res = sysfs_create_file(acg->initiators_kobj,
+ &scst_acg_ini_mgmt.attr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add tgt attr %s for tgt %s",
+ scst_acg_ini_mgmt.attr.name, tgt->tgt_name);
+ goto out_del;
+ }
+
+ res = sysfs_create_file(&acg->acg_kobj, &scst_acg_addr_method.attr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add tgt attr %s for tgt %s",
+ scst_acg_addr_method.attr.name, tgt->tgt_name);
+ goto out_del;
+ }
+
+ res = sysfs_create_file(&acg->acg_kobj, &scst_acg_io_grouping_type.attr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add tgt attr %s for tgt %s",
+ scst_acg_io_grouping_type.attr.name, tgt->tgt_name);
+ goto out_del;
+ }
+
+out:
+ return res;
+
+out_del:
+ scst_acg_sysfs_del(acg);
+ goto out;
+}
+
+static ssize_t scst_acg_addr_method_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct scst_acg *acg;
+
+ acg = container_of(kobj, struct scst_acg, acg_kobj);
+
+ return __scst_acg_addr_method_show(acg, buf);
+}
+
+static ssize_t scst_acg_addr_method_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ int res;
+ struct scst_acg *acg;
+
+ acg = container_of(kobj, struct scst_acg, acg_kobj);
+
+ res = __scst_acg_addr_method_store(acg, buf, count);
+ return res;
+}
+
+static ssize_t scst_acg_io_grouping_type_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct scst_acg *acg;
+
+ acg = container_of(kobj, struct scst_acg, acg_kobj);
+
+ return __scst_acg_io_grouping_type_show(acg, buf);
+}
+
+static ssize_t scst_acg_io_grouping_type_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ int res;
+ struct scst_acg *acg;
+
+ acg = container_of(kobj, struct scst_acg, acg_kobj);
+
+ res = __scst_acg_io_grouping_type_store(acg, buf, count);
+ if (res != 0)
+ goto out;
+
+ res = count;
+
+out:
+ return res;
+}
+
+static ssize_t scst_ini_group_mgmt_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ static char *help = "Usage: echo \"create GROUP_NAME\" >mgmt\n"
+ " echo \"del GROUP_NAME\" >mgmt\n";
+
+ return sprintf(buf, "%s", help);
+}
+
+static int scst_process_ini_group_mgmt_store(char *buffer,
+ struct scst_tgt *tgt)
+{
+ int res, action;
+ int len;
+ char *name;
+ char *p, *e = NULL;
+ struct scst_acg *a, *acg = NULL;
+
+#define SCST_INI_GROUP_ACTION_CREATE 1
+#define SCST_INI_GROUP_ACTION_DEL 2
+
+ TRACE_DBG("tgt %p, buffer %s", tgt, buffer);
+
+ p = buffer;
+ if (p[strlen(p) - 1] == '\n')
+ p[strlen(p) - 1] = '\0';
+ if (strncasecmp("create ", p, 7) == 0) {
+ p += 7;
+ action = SCST_INI_GROUP_ACTION_CREATE;
+ } else if (strncasecmp("del ", p, 4) == 0) {
+ p += 4;
+ action = SCST_INI_GROUP_ACTION_DEL;
+ } else {
+ PRINT_ERROR("Unknown action \"%s\"", p);
+ res = -EINVAL;
+ goto out;
+ }
+
+ res = scst_suspend_activity(true);
+ if (res != 0)
+ goto out;
+
+ if (mutex_lock_interruptible(&scst_mutex) != 0) {
+ res = -EINTR;
+ goto out_resume;
+ }
+
+ /* Check if our pointer is still alive */
+ if (scst_check_tgt_acg_ptrs(tgt, NULL) != 0)
+ goto out_unlock;
+
+ while (isspace(*p) && *p != '\0')
+ p++;
+ e = p;
+ while (!isspace(*e) && *e != '\0')
+ e++;
+ *e = '\0';
+
+ if (p[0] == '\0') {
+ PRINT_ERROR("%s", "Group name required");
+ res = -EINVAL;
+ goto out_unlock;
+ }
+
+ list_for_each_entry(a, &tgt->tgt_acg_list, acg_list_entry) {
+ if (strcmp(a->acg_name, p) == 0) {
+ TRACE_DBG("group (acg) %p %s found",
+ a, a->acg_name);
+ acg = a;
+ break;
+ }
+ }
+
+ switch (action) {
+ case SCST_INI_GROUP_ACTION_CREATE:
+ TRACE_DBG("Creating group '%s'", p);
+ if (acg != NULL) {
+ PRINT_ERROR("acg name %s exist", p);
+ res = -EINVAL;
+ goto out_unlock;
+ }
+
+ len = strlen(p) + 1;
+ name = kmalloc(len, GFP_KERNEL);
+ if (name == NULL) {
+ PRINT_ERROR("%s", "Allocation of name failed");
+ res = -ENOMEM;
+ goto out_unlock;
+ }
+ strlcpy(name, p, len);
+
+ acg = scst_alloc_add_acg(tgt, name, true);
+ kfree(name);
+ if (acg == NULL)
+ goto out_unlock;
+ break;
+ case SCST_INI_GROUP_ACTION_DEL:
+ TRACE_DBG("Deleting group '%s'", p);
+ if (acg == NULL) {
+ PRINT_ERROR("Group %s not found", p);
+ res = -EINVAL;
+ goto out_unlock;
+ }
+ if (!scst_acg_sess_is_empty(acg)) {
+ PRINT_ERROR("Group %s is not empty", acg->acg_name);
+ res = -EBUSY;
+ goto out_unlock;
+ }
+ scst_del_free_acg(acg);
+ break;
+ }
+
+ res = 0;
+
+out_unlock:
+ mutex_unlock(&scst_mutex);
+
+out_resume:
+ scst_resume_activity();
+
+out:
+ return res;
+
+#undef SCST_LUN_ACTION_CREATE
+#undef SCST_LUN_ACTION_DEL
+}
+
+static int scst_ini_group_mgmt_store_work_fn(struct scst_sysfs_work_item *work)
+{
+ return scst_process_ini_group_mgmt_store(work->buf, work->tgt);
+}
+
+static ssize_t scst_ini_group_mgmt_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ int res;
+ char *buffer;
+ struct scst_tgt *tgt;
+ struct scst_sysfs_work_item *work;
+
+ tgt = container_of(kobj->parent, struct scst_tgt, tgt_kobj);
+
+ buffer = kzalloc(count+1, GFP_KERNEL);
+ if (buffer == NULL) {
+ res = -ENOMEM;
+ goto out;
+ }
+ memcpy(buffer, buf, count);
+ buffer[count] = '\0';
+
+ res = scst_alloc_sysfs_work(scst_ini_group_mgmt_store_work_fn, &work);
+ if (res != 0)
+ goto out_free;
+
+ work->buf = buffer;
+ work->tgt = tgt;
+
+ res = scst_sysfs_queue_wait_work(work);
+ if (res == 0)
+ res = count;
+
+out:
+ return res;
+
+out_free:
+ kfree(buffer);
+ goto out;
+}
+
+static ssize_t scst_rel_tgt_id_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct scst_tgt *tgt;
+ int res;
+
+ tgt = container_of(kobj, struct scst_tgt, tgt_kobj);
+
+ res = sprintf(buf, "%d\n%s", tgt->rel_tgt_id,
+ (tgt->rel_tgt_id != 0) ? SCST_SYSFS_KEY_MARK "\n" : "");
+ return res;
+}
+
+static int scst_process_rel_tgt_id_store(struct scst_sysfs_work_item *work)
+{
+ int res = 0;
+ struct scst_tgt *tgt = work->tgt;
+ unsigned long rel_tgt_id = work->l;
+
+ /* tgt protected by kobject_get() */
+
+ TRACE_DBG("Trying to set relative target port id %d",
+ (uint16_t)rel_tgt_id);
+
+ if (tgt->tgtt->is_target_enabled(tgt) &&
+ rel_tgt_id != tgt->rel_tgt_id) {
+ if (!scst_is_relative_target_port_id_unique(rel_tgt_id, tgt)) {
+ PRINT_ERROR("Relative port id %d is not unique",
+ (uint16_t)rel_tgt_id);
+ res = -EBADSLT;
+ goto out_put;
+ }
+ }
+
+ if (rel_tgt_id < SCST_MIN_REL_TGT_ID ||
+ rel_tgt_id > SCST_MAX_REL_TGT_ID) {
+ if ((rel_tgt_id == 0) && !tgt->tgtt->is_target_enabled(tgt))
+ goto set;
+
+ PRINT_ERROR("Invalid relative port id %d",
+ (uint16_t)rel_tgt_id);
+ res = -EINVAL;
+ goto out_put;
+ }
+
+set:
+ tgt->rel_tgt_id = (uint16_t)rel_tgt_id;
+
+out_put:
+ kobject_put(&tgt->tgt_kobj);
+ return res;
+}
+
+static ssize_t scst_rel_tgt_id_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ int res = 0;
+ struct scst_tgt *tgt;
+ unsigned long rel_tgt_id;
+ struct scst_sysfs_work_item *work;
+
+ if (buf == NULL)
+ goto out;
+
+ tgt = container_of(kobj, struct scst_tgt, tgt_kobj);
+
+ res = strict_strtoul(buf, 0, &rel_tgt_id);
+ if (res != 0) {
+ PRINT_ERROR("%s", "Wrong rel_tgt_id");
+ res = -EINVAL;
+ goto out;
+ }
+
+ res = scst_alloc_sysfs_work(scst_process_rel_tgt_id_store, &work);
+ if (res != 0)
+ goto out;
+
+ work->tgt = tgt;
+ work->l = rel_tgt_id;
+
+ kobject_get(&tgt->tgt_kobj);
+
+ res = scst_sysfs_queue_wait_work(work);
+ if (res == 0)
+ res = count;
+
+out:
+ return res;
+}
+
+int scst_acn_sysfs_create(struct scst_acn *acn)
+{
+ int res = 0;
+ int len;
+ struct scst_acg *acg = acn->acg;
+ struct kobj_attribute *attr = NULL;
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ static struct lock_class_key __key;
+#endif
+
+ acn->acn_attr = NULL;
+
+ attr = kzalloc(sizeof(struct kobj_attribute), GFP_KERNEL);
+ if (attr == NULL) {
+ PRINT_ERROR("Unable to allocate attributes for initiator '%s'",
+ acn->name);
+ res = -ENOMEM;
+ goto out;
+ }
+
+ len = strlen(acn->name) + 1;
+ attr->attr.name = kzalloc(len, GFP_KERNEL);
+ if (attr->attr.name == NULL) {
+ PRINT_ERROR("Unable to allocate attributes for initiator '%s'",
+ acn->name);
+ res = -ENOMEM;
+ goto out_free;
+ }
+ strlcpy((char *)attr->attr.name, acn->name, len);
+
+ attr->attr.owner = THIS_MODULE;
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ attr->attr.key = &__key;
+#endif
+
+ attr->attr.mode = S_IRUGO;
+ attr->show = scst_acn_file_show;
+ attr->store = NULL;
+
+ res = sysfs_create_file(acg->initiators_kobj, &attr->attr);
+ if (res != 0) {
+ PRINT_ERROR("Unable to create acn '%s' for group '%s'",
+ acn->name, acg->acg_name);
+ kfree(attr->attr.name);
+ goto out_free;
+ }
+
+ acn->acn_attr = attr;
+
+out:
+ return res;
+
+out_free:
+ kfree(attr);
+ goto out;
+}
+
+void scst_acn_sysfs_del(struct scst_acn *acn)
+{
+ struct scst_acg *acg = acn->acg;
+
+ if (acn->acn_attr != NULL) {
+ sysfs_remove_file(acg->initiators_kobj,
+ &acn->acn_attr->attr);
+ kfree(acn->acn_attr->attr.name);
+ kfree(acn->acn_attr);
+ }
+ return;
+}
+
+static ssize_t scst_acn_file_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ return scnprintf(buf, SCST_SYSFS_BLOCK_SIZE, "%s\n",
+ attr->attr.name);
+}
+
+static ssize_t scst_acg_luns_mgmt_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count)
+{
+ int res;
+ struct scst_acg *acg;
+
+ acg = container_of(kobj->parent, struct scst_acg, acg_kobj);
+ res = __scst_luns_mgmt_store(acg, false, buf, count);
+ return res;
+}
+
+static ssize_t scst_acg_ini_mgmt_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ static char *help = "Usage: echo \"add INITIATOR_NAME\" "
+ ">mgmt\n"
+ " echo \"del INITIATOR_NAME\" "
+ ">mgmt\n"
+ " echo \"move INITIATOR_NAME DEST_GROUP_NAME\" "
+ ">mgmt\n"
+ " echo \"clear\" "
+ ">mgmt\n";
+
+ return sprintf(buf, "%s", help);
+}
+
+static int scst_process_acg_ini_mgmt_store(char *buffer,
+ struct scst_tgt *tgt, struct scst_acg *acg)
+{
+ int res, action;
+ char *p, *e = NULL;
+ char *name = NULL, *group = NULL;
+ struct scst_acg *acg_dest = NULL;
+ struct scst_acn *acn = NULL, *acn_tmp;
+
+#define SCST_ACG_ACTION_INI_ADD 1
+#define SCST_ACG_ACTION_INI_DEL 2
+#define SCST_ACG_ACTION_INI_CLEAR 3
+#define SCST_ACG_ACTION_INI_MOVE 4
+
+ TRACE_DBG("tgt %p, acg %p, buffer %s", tgt, acg, buffer);
+
+ p = buffer;
+ if (p[strlen(p) - 1] == '\n')
+ p[strlen(p) - 1] = '\0';
+
+ if (strncasecmp("add", p, 3) == 0) {
+ p += 3;
+ action = SCST_ACG_ACTION_INI_ADD;
+ } else if (strncasecmp("del", p, 3) == 0) {
+ p += 3;
+ action = SCST_ACG_ACTION_INI_DEL;
+ } else if (strncasecmp("clear", p, 5) == 0) {
+ p += 5;
+ action = SCST_ACG_ACTION_INI_CLEAR;
+ } else if (strncasecmp("move", p, 4) == 0) {
+ p += 4;
+ action = SCST_ACG_ACTION_INI_MOVE;
+ } else {
+ PRINT_ERROR("Unknown action \"%s\"", p);
+ res = -EINVAL;
+ goto out;
+ }
+
+ if (action != SCST_ACG_ACTION_INI_CLEAR)
+ if (!isspace(*p)) {
+ PRINT_ERROR("%s", "Syntax error");
+ res = -EINVAL;
+ goto out;
+ }
+
+ res = scst_suspend_activity(true);
+ if (res != 0)
+ goto out;
+
+ if (mutex_lock_interruptible(&scst_mutex) != 0) {
+ res = -EINTR;
+ goto out_resume;
+ }
+
+ /* Check if tgt and acg not already freed while we were coming here */
+ if (scst_check_tgt_acg_ptrs(tgt, acg) != 0)
+ goto out_unlock;
+
+ if (action != SCST_ACG_ACTION_INI_CLEAR)
+ while (isspace(*p) && *p != '\0')
+ p++;
+
+ switch (action) {
+ case SCST_ACG_ACTION_INI_ADD:
+ e = p;
+ while (!isspace(*e) && *e != '\0')
+ e++;
+ *e = '\0';
+ name = p;
+
+ if (name[0] == '\0') {
+ PRINT_ERROR("%s", "Invalid initiator name");
+ res = -EINVAL;
+ goto out_unlock;
+ }
+
+ res = scst_acg_add_acn(acg, name);
+ if (res != 0)
+ goto out_unlock;
+ break;
+ case SCST_ACG_ACTION_INI_DEL:
+ e = p;
+ while (!isspace(*e) && *e != '\0')
+ e++;
+ *e = '\0';
+ name = p;
+
+ if (name[0] == '\0') {
+ PRINT_ERROR("%s", "Invalid initiator name");
+ res = -EINVAL;
+ goto out_unlock;
+ }
+
+ acn = scst_find_acn(acg, name);
+ if (acn == NULL) {
+ PRINT_ERROR("Unable to find "
+ "initiator '%s' in group '%s'",
+ name, acg->acg_name);
+ res = -EINVAL;
+ goto out_unlock;
+ }
+ scst_del_free_acn(acn, true);
+ break;
+ case SCST_ACG_ACTION_INI_CLEAR:
+ list_for_each_entry_safe(acn, acn_tmp, &acg->acn_list,
+ acn_list_entry) {
+ scst_del_free_acn(acn, false);
+ }
+ scst_check_reassign_sessions();
+ break;
+ case SCST_ACG_ACTION_INI_MOVE:
+ e = p;
+ while (!isspace(*e) && *e != '\0')
+ e++;
+ if (*e == '\0') {
+ PRINT_ERROR("%s", "Too few parameters");
+ res = -EINVAL;
+ goto out_unlock;
+ }
+ *e = '\0';
+ name = p;
+
+ if (name[0] == '\0') {
+ PRINT_ERROR("%s", "Invalid initiator name");
+ res = -EINVAL;
+ goto out_unlock;
+ }
+
+ e++;
+ p = e;
+ while (!isspace(*e) && *e != '\0')
+ e++;
+ *e = '\0';
+ group = p;
+
+ if (group[0] == '\0') {
+ PRINT_ERROR("%s", "Invalid group name");
+ res = -EINVAL;
+ goto out_unlock;
+ }
+
+ TRACE_DBG("Move initiator '%s' to group '%s'",
+ name, group);
+
+ acn = scst_find_acn(acg, name);
+ if (acn == NULL) {
+ PRINT_ERROR("Unable to find "
+ "initiator '%s' in group '%s'",
+ name, acg->acg_name);
+ res = -EINVAL;
+ goto out_unlock;
+ }
+ acg_dest = scst_tgt_find_acg(tgt, group);
+ if (acg_dest == NULL) {
+ PRINT_ERROR("Unable to find group '%s' in target '%s'",
+ group, tgt->tgt_name);
+ res = -EINVAL;
+ goto out_unlock;
+ }
+ if (scst_find_acn(acg_dest, name) != NULL) {
+ PRINT_ERROR("Initiator '%s' already exists in group '%s'",
+ name, acg_dest->acg_name);
+ res = -EEXIST;
+ goto out_unlock;
+ }
+ scst_del_free_acn(acn, false);
+
+ res = scst_acg_add_acn(acg_dest, name);
+ if (res != 0)
+ goto out_unlock;
+ break;
+ }
+
+ res = 0;
+
+out_unlock:
+ mutex_unlock(&scst_mutex);
+
+out_resume:
+ scst_resume_activity();
+
+out:
+ return res;
+
+#undef SCST_ACG_ACTION_INI_ADD
+#undef SCST_ACG_ACTION_INI_DEL
+#undef SCST_ACG_ACTION_INI_CLEAR
+#undef SCST_ACG_ACTION_INI_MOVE
+}
+
+static int scst_acg_ini_mgmt_store_work_fn(struct scst_sysfs_work_item *work)
+{
+ return scst_process_acg_ini_mgmt_store(work->buf, work->tgt, work->acg);
+}
+
+static ssize_t scst_acg_ini_mgmt_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ struct scst_acg *acg;
+
+ acg = container_of(kobj->parent, struct scst_acg, acg_kobj);
+
+ return __scst_acg_mgmt_store(acg, buf, count, false,
+ scst_acg_ini_mgmt_store_work_fn);
+}
+
+/**
+ ** SGV directory implementation
+ **/
+
+static struct kobj_attribute sgv_stat_attr =
+ __ATTR(stats, S_IRUGO | S_IWUSR, sgv_sysfs_stat_show,
+ sgv_sysfs_stat_reset);
+
+static struct attribute *sgv_attrs[] = {
+ &sgv_stat_attr.attr,
+ NULL,
+};
+
+static void sgv_kobj_release(struct kobject *kobj)
+{
+ struct sgv_pool *pool;
+
+ pool = container_of(kobj, struct sgv_pool, sgv_kobj);
+ complete_all(&pool->sgv_kobj_release_cmpl);
+ return;
+}
+
+static struct kobj_type sgv_pool_ktype = {
+ .sysfs_ops = &scst_sysfs_ops,
+ .release = sgv_kobj_release,
+ .default_attrs = sgv_attrs,
+};
+
+int scst_sgv_sysfs_create(struct sgv_pool *pool)
+{
+ int res;
+
+ init_completion(&pool->sgv_kobj_release_cmpl);
+
+ res = kobject_init_and_add(&pool->sgv_kobj, &sgv_pool_ktype,
+ scst_sgv_kobj, pool->name);
+ if (res != 0) {
+ PRINT_ERROR("Can't add sgv pool %s to sysfs", pool->name);
+ goto out;
+ }
+
+out:
+ return res;
+}
+
+void scst_sgv_sysfs_del(struct sgv_pool *pool)
+{
+ int rc;
+
+ kobject_del(&pool->sgv_kobj);
+ kobject_put(&pool->sgv_kobj);
+
+ rc = wait_for_completion_timeout(&pool->sgv_kobj_release_cmpl, HZ);
+ if (rc == 0) {
+ PRINT_INFO("Waiting for releasing sysfs entry "
+ "for SGV pool %s (%d refs)...", pool->name,
+ atomic_read(&pool->sgv_kobj.kref.refcount));
+ wait_for_completion(&pool->sgv_kobj_release_cmpl);
+ PRINT_INFO("Done waiting for releasing sysfs "
+ "entry for SGV pool %s", pool->name);
+ }
+ return;
+}
+
+static struct kobj_attribute sgv_global_stat_attr =
+ __ATTR(global_stats, S_IRUGO | S_IWUSR, sgv_sysfs_global_stat_show,
+ sgv_sysfs_global_stat_reset);
+
+static struct attribute *sgv_default_attrs[] = {
+ &sgv_global_stat_attr.attr,
+ NULL,
+};
+
+static void scst_sysfs_release(struct kobject *kobj)
+{
+ kfree(kobj);
+}
+
+static struct kobj_type sgv_ktype = {
+ .sysfs_ops = &scst_sysfs_ops,
+ .release = scst_sysfs_release,
+ .default_attrs = sgv_default_attrs,
+};
+
+/**
+ ** SCST sysfs root directory implementation
+ **/
+
+static ssize_t scst_threads_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ int count;
+
+ count = sprintf(buf, "%d\n%s", scst_main_cmd_threads.nr_threads,
+ (scst_main_cmd_threads.nr_threads != scst_threads) ?
+ SCST_SYSFS_KEY_MARK "\n" : "");
+ return count;
+}
+
+static int scst_process_threads_store(int newtn)
+{
+ int res;
+ long oldtn, delta;
+
+ TRACE_DBG("newtn %d", newtn);
+
+ if (mutex_lock_interruptible(&scst_mutex) != 0) {
+ res = -EINTR;
+ goto out;
+ }
+
+ oldtn = scst_main_cmd_threads.nr_threads;
+
+ delta = newtn - oldtn;
+ if (delta < 0)
+ scst_del_threads(&scst_main_cmd_threads, -delta);
+ else {
+ res = scst_add_threads(&scst_main_cmd_threads, NULL, NULL, delta);
+ if (res != 0)
+ goto out_up;
+ }
+
+ PRINT_INFO("Changed cmd threads num: old %ld, new %d", oldtn, newtn);
+
+out_up:
+ mutex_unlock(&scst_mutex);
+
+out:
+ return res;
+}
+
+static int scst_threads_store_work_fn(struct scst_sysfs_work_item *work)
+{
+ return scst_process_threads_store(work->new_threads_num);
+}
+
+static ssize_t scst_threads_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ int res;
+ long newtn;
+ struct scst_sysfs_work_item *work;
+
+ res = strict_strtol(buf, 0, &newtn);
+ if (res != 0) {
+ PRINT_ERROR("strict_strtol() for %s failed: %d ", buf, res);
+ goto out;
+ }
+ if (newtn <= 0) {
+ PRINT_ERROR("Illegal threads num value %ld", newtn);
+ res = -EINVAL;
+ goto out;
+ }
+
+ res = scst_alloc_sysfs_work(scst_threads_store_work_fn, &work);
+ if (res != 0)
+ goto out;
+
+ work->new_threads_num = newtn;
+
+ res = scst_sysfs_queue_wait_work(work);
+ if (res == 0)
+ res = count;
+
+out:
+ return res;
+}
+
+static ssize_t scst_setup_id_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ int count;
+
+ count = sprintf(buf, "0x%x\n%s\n", scst_setup_id,
+ (scst_setup_id == 0) ? "" : SCST_SYSFS_KEY_MARK);
+ return count;
+}
+
+static ssize_t scst_setup_id_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ int res;
+ unsigned long val;
+
+ res = strict_strtoul(buf, 0, &val);
+ if (res != 0) {
+ PRINT_ERROR("strict_strtoul() for %s failed: %d ", buf, res);
+ goto out;
+ }
+
+ scst_setup_id = val;
+ PRINT_INFO("Changed scst_setup_id to %x", scst_setup_id);
+
+ res = count;
+
+out:
+ return res;
+}
+
+#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
+
+static void scst_read_trace_tlb(const struct scst_trace_log *tbl, char *buf,
+ unsigned long log_level, int *pos)
+{
+ const struct scst_trace_log *t = tbl;
+
+ if (t == NULL)
+ goto out;
+
+ while (t->token) {
+ if (log_level & t->val) {
+ *pos += sprintf(&buf[*pos], "%s%s",
+ (*pos == 0) ? "" : " | ",
+ t->token);
+ }
+ t++;
+ }
+out:
+ return;
+}
+
+static ssize_t scst_trace_level_show(const struct scst_trace_log *local_tbl,
+ unsigned long log_level, char *buf, const char *help)
+{
+ int pos = 0;
+
+ scst_read_trace_tlb(scst_trace_tbl, buf, log_level, &pos);
+ scst_read_trace_tlb(local_tbl, buf, log_level, &pos);
+
+ pos += sprintf(&buf[pos], "\n\n\nUsage:\n"
+ " echo \"all|none|default\" >trace_level\n"
+ " echo \"value DEC|0xHEX|0OCT\" >trace_level\n"
+ " echo \"add|del TOKEN\" >trace_level\n"
+ "\nwhere TOKEN is one of [debug, function, line, pid,\n"
+ " buff, mem, sg, out_of_mem,\n"
+ " special, scsi, mgmt, minor,\n"
+ " mgmt_dbg, scsi_serializing,\n"
+ " retry, recv_bot, send_bot, recv_top, pr,\n"
+ " send_top%s]", help != NULL ? help : "");
+
+ return pos;
+}
+
+static ssize_t scst_main_trace_level_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ return scst_trace_level_show(scst_local_trace_tbl, trace_flag,
+ buf, NULL);
+}
+
+static int scst_write_trace(const char *buf, size_t length,
+ unsigned long *log_level, unsigned long default_level,
+ const char *name, const struct scst_trace_log *tbl)
+{
+ int res = length;
+ int action;
+ unsigned long level = 0, oldlevel;
+ char *buffer, *p, *e;
+ const struct scst_trace_log *t;
+
+#define SCST_TRACE_ACTION_ALL 1
+#define SCST_TRACE_ACTION_NONE 2
+#define SCST_TRACE_ACTION_DEFAULT 3
+#define SCST_TRACE_ACTION_ADD 4
+#define SCST_TRACE_ACTION_DEL 5
+#define SCST_TRACE_ACTION_VALUE 6
+
+ if ((buf == NULL) || (length == 0)) {
+ res = -EINVAL;
+ goto out;
+ }
+
+ buffer = kmalloc(length+1, GFP_KERNEL);
+ if (buffer == NULL) {
+ PRINT_ERROR("Unable to alloc intermediate buffer (size %zd)",
+ length+1);
+ res = -ENOMEM;
+ goto out;
+ }
+ memcpy(buffer, buf, length);
+ buffer[length] = '\0';
+
+ TRACE_DBG("buffer %s", buffer);
+
+ p = buffer;
+ if (!strncasecmp("all", p, 3)) {
+ action = SCST_TRACE_ACTION_ALL;
+ } else if (!strncasecmp("none", p, 4) || !strncasecmp("null", p, 4)) {
+ action = SCST_TRACE_ACTION_NONE;
+ } else if (!strncasecmp("default", p, 7)) {
+ action = SCST_TRACE_ACTION_DEFAULT;
+ } else if (!strncasecmp("add", p, 3)) {
+ p += 3;
+ action = SCST_TRACE_ACTION_ADD;
+ } else if (!strncasecmp("del", p, 3)) {
+ p += 3;
+ action = SCST_TRACE_ACTION_DEL;
+ } else if (!strncasecmp("value", p, 5)) {
+ p += 5;
+ action = SCST_TRACE_ACTION_VALUE;
+ } else {
+ if (p[strlen(p) - 1] == '\n')
+ p[strlen(p) - 1] = '\0';
+ PRINT_ERROR("Unknown action \"%s\"", p);
+ res = -EINVAL;
+ goto out_free;
+ }
+
+ switch (action) {
+ case SCST_TRACE_ACTION_ADD:
+ case SCST_TRACE_ACTION_DEL:
+ case SCST_TRACE_ACTION_VALUE:
+ if (!isspace(*p)) {
+ PRINT_ERROR("%s", "Syntax error");
+ res = -EINVAL;
+ goto out_free;
+ }
+ }
+
+ switch (action) {
+ case SCST_TRACE_ACTION_ALL:
+ level = TRACE_ALL;
+ break;
+ case SCST_TRACE_ACTION_DEFAULT:
+ level = default_level;
+ break;
+ case SCST_TRACE_ACTION_NONE:
+ level = TRACE_NULL;
+ break;
+ case SCST_TRACE_ACTION_ADD:
+ case SCST_TRACE_ACTION_DEL:
+ while (isspace(*p) && *p != '\0')
+ p++;
+ e = p;
+ while (!isspace(*e) && *e != '\0')
+ e++;
+ *e = 0;
+ if (tbl) {
+ t = tbl;
+ while (t->token) {
+ if (!strcasecmp(p, t->token)) {
+ level = t->val;
+ break;
+ }
+ t++;
+ }
+ }
+ if (level == 0) {
+ t = scst_trace_tbl;
+ while (t->token) {
+ if (!strcasecmp(p, t->token)) {
+ level = t->val;
+ break;
+ }
+ t++;
+ }
+ }
+ if (level == 0) {
+ PRINT_ERROR("Unknown token \"%s\"", p);
+ res = -EINVAL;
+ goto out_free;
+ }
+ break;
+ case SCST_TRACE_ACTION_VALUE:
+ while (isspace(*p) && *p != '\0')
+ p++;
+ res = strict_strtoul(p, 0, &level);
+ if (res != 0) {
+ PRINT_ERROR("Invalid trace value \"%s\"", p);
+ res = -EINVAL;
+ goto out_free;
+ }
+ break;
+ }
+
+ oldlevel = *log_level;
+
+ switch (action) {
+ case SCST_TRACE_ACTION_ADD:
+ *log_level |= level;
+ break;
+ case SCST_TRACE_ACTION_DEL:
+ *log_level &= ~level;
+ break;
+ default:
+ *log_level = level;
+ break;
+ }
+
+ PRINT_INFO("Changed trace level for \"%s\": old 0x%08lx, new 0x%08lx",
+ name, oldlevel, *log_level);
+
+out_free:
+ kfree(buffer);
+out:
+ return res;
+
+#undef SCST_TRACE_ACTION_ALL
+#undef SCST_TRACE_ACTION_NONE
+#undef SCST_TRACE_ACTION_DEFAULT
+#undef SCST_TRACE_ACTION_ADD
+#undef SCST_TRACE_ACTION_DEL
+#undef SCST_TRACE_ACTION_VALUE
+}
+
+static ssize_t scst_main_trace_level_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ int res;
+
+ if (mutex_lock_interruptible(&scst_log_mutex) != 0) {
+ res = -EINTR;
+ goto out;
+ }
+
+ res = scst_write_trace(buf, count, &trace_flag,
+ SCST_DEFAULT_LOG_FLAGS, "scst", scst_local_trace_tbl);
+
+ mutex_unlock(&scst_log_mutex);
+
+out:
+ return res;
+}
+
+#endif /* defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING) */
+
+static ssize_t scst_version_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+
+ sprintf(buf, "%s\n", SCST_VERSION_STRING);
+
+#ifdef CONFIG_SCST_STRICT_SERIALIZING
+ strcat(buf, "STRICT_SERIALIZING\n");
+#endif
+
+#ifdef CONFIG_SCST_EXTRACHECKS
+ strcat(buf, "EXTRACHECKS\n");
+#endif
+
+#ifdef CONFIG_SCST_TRACING
+ strcat(buf, "TRACING\n");
+#endif
+
+#ifdef CONFIG_SCST_DEBUG
+ strcat(buf, "DEBUG\n");
+#endif
+
+#ifdef CONFIG_SCST_DEBUG_TM
+ strcat(buf, "DEBUG_TM\n");
+#endif
+
+#ifdef CONFIG_SCST_DEBUG_RETRY
+ strcat(buf, "DEBUG_RETRY\n");
+#endif
+
+#ifdef CONFIG_SCST_DEBUG_OOM
+ strcat(buf, "DEBUG_OOM\n");
+#endif
+
+#ifdef CONFIG_SCST_DEBUG_SN
+ strcat(buf, "DEBUG_SN\n");
+#endif
+
+#ifdef CONFIG_SCST_USE_EXPECTED_VALUES
+ strcat(buf, "USE_EXPECTED_VALUES\n");
+#endif
+
+#ifdef CONFIG_SCST_TEST_IO_IN_SIRQ
+ strcat(buf, "TEST_IO_IN_SIRQ\n");
+#endif
+
+#ifdef CONFIG_SCST_STRICT_SECURITY
+ strcat(buf, "STRICT_SECURITY\n");
+#endif
+ return strlen(buf);
+}
+
+static ssize_t scst_last_sysfs_mgmt_res_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ int res;
+
+ spin_lock(&sysfs_work_lock);
+ TRACE_DBG("active_sysfs_works %d", active_sysfs_works);
+ if (active_sysfs_works > 0)
+ res = -EAGAIN;
+ else
+ res = sprintf(buf, "%d\n", last_sysfs_work_res);
+ spin_unlock(&sysfs_work_lock);
+ return res;
+}
+
+static struct kobj_attribute scst_threads_attr =
+ __ATTR(threads, S_IRUGO | S_IWUSR, scst_threads_show,
+ scst_threads_store);
+
+static struct kobj_attribute scst_setup_id_attr =
+ __ATTR(setup_id, S_IRUGO | S_IWUSR, scst_setup_id_show,
+ scst_setup_id_store);
+
+#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
+static struct kobj_attribute scst_trace_level_attr =
+ __ATTR(trace_level, S_IRUGO | S_IWUSR, scst_main_trace_level_show,
+ scst_main_trace_level_store);
+#endif
+
+static struct kobj_attribute scst_version_attr =
+ __ATTR(version, S_IRUGO, scst_version_show, NULL);
+
+static struct kobj_attribute scst_last_sysfs_mgmt_res_attr =
+ __ATTR(last_sysfs_mgmt_res, S_IRUGO,
+ scst_last_sysfs_mgmt_res_show, NULL);
+
+static struct attribute *scst_sysfs_root_default_attrs[] = {
+ &scst_threads_attr.attr,
+ &scst_setup_id_attr.attr,
+#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
+ &scst_trace_level_attr.attr,
+#endif
+ &scst_version_attr.attr,
+ &scst_last_sysfs_mgmt_res_attr.attr,
+ NULL,
+};
+
+static void scst_sysfs_root_release(struct kobject *kobj)
+{
+ complete_all(&scst_sysfs_root_release_completion);
+}
+
+static struct kobj_type scst_sysfs_root_ktype = {
+ .sysfs_ops = &scst_sysfs_ops,
+ .release = scst_sysfs_root_release,
+ .default_attrs = scst_sysfs_root_default_attrs,
+};
+
+/**
+ ** Dev handlers
+ **/
+
+static void scst_devt_release(struct kobject *kobj)
+{
+ struct scst_dev_type *devt;
+
+ devt = container_of(kobj, struct scst_dev_type, devt_kobj);
+ complete_all(&devt->devt_kobj_release_compl);
+ return;
+}
+
+#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
+
+static ssize_t scst_devt_trace_level_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct scst_dev_type *devt;
+
+ devt = container_of(kobj, struct scst_dev_type, devt_kobj);
+
+ return scst_trace_level_show(devt->trace_tbl,
+ devt->trace_flags ? *devt->trace_flags : 0, buf,
+ devt->trace_tbl_help);
+}
+
+static ssize_t scst_devt_trace_level_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ int res;
+ struct scst_dev_type *devt;
+
+ devt = container_of(kobj, struct scst_dev_type, devt_kobj);
+
+ if (mutex_lock_interruptible(&scst_log_mutex) != 0) {
+ res = -EINTR;
+ goto out;
+ }
+
+ res = scst_write_trace(buf, count, devt->trace_flags,
+ devt->default_trace_flags, devt->name, devt->trace_tbl);
+
+ mutex_unlock(&scst_log_mutex);
+
+out:
+ return res;
+}
+
+static struct kobj_attribute devt_trace_attr =
+ __ATTR(trace_level, S_IRUGO | S_IWUSR,
+ scst_devt_trace_level_show, scst_devt_trace_level_store);
+
+#endif /* #if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING) */
+
+static ssize_t scst_devt_type_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ int pos;
+ struct scst_dev_type *devt;
+
+ devt = container_of(kobj, struct scst_dev_type, devt_kobj);
+
+ pos = sprintf(buf, "%d - %s\n", devt->type,
+ (unsigned)devt->type > ARRAY_SIZE(scst_dev_handler_types) ?
+ "unknown" : scst_dev_handler_types[devt->type]);
+
+ return pos;
+}
+
+static struct kobj_attribute scst_devt_type_attr =
+ __ATTR(type, S_IRUGO, scst_devt_type_show, NULL);
+
+static struct attribute *scst_devt_default_attrs[] = {
+ &scst_devt_type_attr.attr,
+ NULL,
+};
+
+static struct kobj_type scst_devt_ktype = {
+ .sysfs_ops = &scst_sysfs_ops,
+ .release = scst_devt_release,
+ .default_attrs = scst_devt_default_attrs,
+};
+
+static ssize_t scst_devt_mgmt_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ char *help = "Usage: echo \"add_device device_name [parameters]\" "
+ ">mgmt\n"
+ " echo \"del_device device_name\" >mgmt\n"
+ "%s%s"
+ "%s"
+ "\n"
+ "where parameters are one or more "
+ "param_name=value pairs separated by ';'\n\n"
+ "%s%s%s%s%s%s%s%s\n";
+ struct scst_dev_type *devt;
+
+ devt = container_of(kobj, struct scst_dev_type, devt_kobj);
+
+ return scnprintf(buf, SCST_SYSFS_BLOCK_SIZE, help,
+ (devt->devt_optional_attributes != NULL) ?
+ " echo \"add_attribute <attribute> <value>\" >mgmt\n"
+ " echo \"del_attribute <attribute> <value>\" >mgmt\n" : "",
+ (devt->dev_optional_attributes != NULL) ?
+ " echo \"add_device_attribute device_name <attribute> <value>\" >mgmt"
+ " echo \"del_device_attribute device_name <attribute> <value>\" >mgmt\n" : "",
+ (devt->mgmt_cmd_help) ? devt->mgmt_cmd_help : "",
+ (devt->add_device_parameters != NULL) ?
+ "The following parameters available: " : "",
+ (devt->add_device_parameters != NULL) ?
+ devt->add_device_parameters : "",
+ (devt->devt_optional_attributes != NULL) ?
+ "The following dev handler attributes available: " : "",
+ (devt->devt_optional_attributes != NULL) ?
+ devt->devt_optional_attributes : "",
+ (devt->devt_optional_attributes != NULL) ? "\n" : "",
+ (devt->dev_optional_attributes != NULL) ?
+ "The following device attributes available: " : "",
+ (devt->dev_optional_attributes != NULL) ?
+ devt->dev_optional_attributes : "",
+ (devt->dev_optional_attributes != NULL) ? "\n" : "");
+}
+
+static int scst_process_devt_mgmt_store(char *buffer,
+ struct scst_dev_type *devt)
+{
+ int res = 0;
+ char *p, *pp, *dev_name;
+
+ /* Check if our pointer is still alive and, if yes, grab it */
+ if (scst_check_grab_devt_ptr(devt, &scst_virtual_dev_type_list) != 0)
+ goto out;
+
+ TRACE_DBG("devt %p, buffer %s", devt, buffer);
+
+ pp = buffer;
+ if (pp[strlen(pp) - 1] == '\n')
+ pp[strlen(pp) - 1] = '\0';
+
+ p = scst_get_next_lexem(&pp);
+
+ if (strcasecmp("add_device", p) == 0) {
+ dev_name = scst_get_next_lexem(&pp);
+ if (*dev_name == '\0') {
+ PRINT_ERROR("%s", "Device name required");
+ res = -EINVAL;
+ goto out_ungrab;
+ }
+ res = devt->add_device(dev_name, pp);
+ } else if (strcasecmp("del_device", p) == 0) {
+ dev_name = scst_get_next_lexem(&pp);
+ if (*dev_name == '\0') {
+ PRINT_ERROR("%s", "Device name required");
+ res = -EINVAL;
+ goto out_ungrab;
+ }
+
+ p = scst_get_next_lexem(&pp);
+ if (*p != '\0')
+ goto out_syntax_err;
+
+ res = devt->del_device(dev_name);
+ } else if (devt->mgmt_cmd != NULL) {
+ scst_restore_token_str(p, pp);
+ res = devt->mgmt_cmd(buffer);
+ } else {
+ PRINT_ERROR("Unknown action \"%s\"", p);
+ res = -EINVAL;
+ goto out_ungrab;
+ }
+
+out_ungrab:
+ scst_ungrab_devt_ptr(devt);
+
+out:
+ return res;
+
+out_syntax_err:
+ PRINT_ERROR("Syntax error on \"%s\"", p);
+ res = -EINVAL;
+ goto out_ungrab;
+}
+
+static int scst_devt_mgmt_store_work_fn(struct scst_sysfs_work_item *work)
+{
+ return scst_process_devt_mgmt_store(work->buf, work->devt);
+}
+
+static ssize_t __scst_devt_mgmt_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count,
+ int (*sysfs_work_fn)(struct scst_sysfs_work_item *work))
+{
+ int res;
+ char *buffer;
+ struct scst_dev_type *devt;
+ struct scst_sysfs_work_item *work;
+
+ devt = container_of(kobj, struct scst_dev_type, devt_kobj);
+
+ buffer = kzalloc(count+1, GFP_KERNEL);
+ if (buffer == NULL) {
+ res = -ENOMEM;
+ goto out;
+ }
+ memcpy(buffer, buf, count);
+ buffer[count] = '\0';
+
+ res = scst_alloc_sysfs_work(sysfs_work_fn, &work);
+ if (res != 0)
+ goto out_free;
+
+ work->buf = buffer;
+ work->devt = devt;
+
+ res = scst_sysfs_queue_wait_work(work);
+ if (res == 0)
+ res = count;
+
+out:
+ return res;
+
+out_free:
+ kfree(buffer);
+ goto out;
+}
+
+static ssize_t scst_devt_mgmt_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ return __scst_devt_mgmt_store(kobj, attr, buf, count,
+ scst_devt_mgmt_store_work_fn);
+}
+
+static struct kobj_attribute scst_devt_mgmt =
+ __ATTR(mgmt, S_IRUGO | S_IWUSR, scst_devt_mgmt_show,
+ scst_devt_mgmt_store);
+
+static ssize_t scst_devt_pass_through_mgmt_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ char *help = "Usage: echo \"add_device H:C:I:L\" >mgmt\n"
+ " echo \"del_device H:C:I:L\" >mgmt\n";
+ return sprintf(buf, "%s", help);
+}
+
+static int scst_process_devt_pass_through_mgmt_store(char *buffer,
+ struct scst_dev_type *devt)
+{
+ int res = 0;
+ char *p, *pp, *action;
+ unsigned long host, channel, id, lun;
+ struct scst_device *d, *dev = NULL;
+
+ TRACE_DBG("devt %p, buffer %s", devt, buffer);
+
+ pp = buffer;
+ if (pp[strlen(pp) - 1] == '\n')
+ pp[strlen(pp) - 1] = '\0';
+
+ action = scst_get_next_lexem(&pp);
+ p = scst_get_next_lexem(&pp);
+ if (*p == '\0') {
+ PRINT_ERROR("%s", "Device required");
+ res = -EINVAL;
+ goto out;
+ }
+
+ if (*scst_get_next_lexem(&pp) != '\0') {
+ PRINT_ERROR("%s", "Too many parameters");
+ res = -EINVAL;
+ goto out_syntax_err;
+ }
+
+ host = simple_strtoul(p, &p, 0);
+ if ((host == ULONG_MAX) || (*p != ':'))
+ goto out_syntax_err;
+ p++;
+ channel = simple_strtoul(p, &p, 0);
+ if ((channel == ULONG_MAX) || (*p != ':'))
+ goto out_syntax_err;
+ p++;
+ id = simple_strtoul(p, &p, 0);
+ if ((channel == ULONG_MAX) || (*p != ':'))
+ goto out_syntax_err;
+ p++;
+ lun = simple_strtoul(p, &p, 0);
+ if (lun == ULONG_MAX)
+ goto out_syntax_err;
+
+ TRACE_DBG("Dev %ld:%ld:%ld:%ld", host, channel, id, lun);
+
+ if (mutex_lock_interruptible(&scst_mutex) != 0) {
+ res = -EINTR;
+ goto out;
+ }
+
+ /* Check if devt not be already freed while we were coming here */
+ if (scst_check_devt_ptr(devt, &scst_dev_type_list) != 0)
+ goto out_unlock;
+
+ list_for_each_entry(d, &scst_dev_list, dev_list_entry) {
+ if ((d->virt_id == 0) &&
+ d->scsi_dev->host->host_no == host &&
+ d->scsi_dev->channel == channel &&
+ d->scsi_dev->id == id &&
+ d->scsi_dev->lun == lun) {
+ dev = d;
+ TRACE_DBG("Dev %p (%ld:%ld:%ld:%ld) found",
+ dev, host, channel, id, lun);
+ break;
+ }
+ }
+ if (dev == NULL) {
+ PRINT_ERROR("Device %ld:%ld:%ld:%ld not found",
+ host, channel, id, lun);
+ res = -EINVAL;
+ goto out_unlock;
+ }
+
+ if (dev->scsi_dev->type != devt->type) {
+ PRINT_ERROR("Type %d of device %s differs from type "
+ "%d of dev handler %s", dev->type,
+ dev->virt_name, devt->type, devt->name);
+ res = -EINVAL;
+ goto out_unlock;
+ }
+
+ if (strcasecmp("add_device", action) == 0) {
+ res = scst_assign_dev_handler(dev, devt);
+ if (res == 0)
+ PRINT_INFO("Device %s assigned to dev handler %s",
+ dev->virt_name, devt->name);
+ } else if (strcasecmp("del_device", action) == 0) {
+ if (dev->handler != devt) {
+ PRINT_ERROR("Device %s is not assigned to handler %s",
+ dev->virt_name, devt->name);
+ res = -EINVAL;
+ goto out_unlock;
+ }
+ res = scst_assign_dev_handler(dev, &scst_null_devtype);
+ if (res == 0)
+ PRINT_INFO("Device %s unassigned from dev handler %s",
+ dev->virt_name, devt->name);
+ } else {
+ PRINT_ERROR("Unknown action \"%s\"", action);
+ res = -EINVAL;
+ goto out_unlock;
+ }
+
+out_unlock:
+ mutex_unlock(&scst_mutex);
+
+out:
+ return res;
+
+out_syntax_err:
+ PRINT_ERROR("Syntax error on \"%s\"", p);
+ res = -EINVAL;
+ goto out;
+}
+
+static int scst_devt_pass_through_mgmt_store_work_fn(
+ struct scst_sysfs_work_item *work)
+{
+ return scst_process_devt_pass_through_mgmt_store(work->buf, work->devt);
+}
+
+static ssize_t scst_devt_pass_through_mgmt_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ return __scst_devt_mgmt_store(kobj, attr, buf, count,
+ scst_devt_pass_through_mgmt_store_work_fn);
+}
+
+static struct kobj_attribute scst_devt_pass_through_mgmt =
+ __ATTR(mgmt, S_IRUGO | S_IWUSR, scst_devt_pass_through_mgmt_show,
+ scst_devt_pass_through_mgmt_store);
+
+int scst_devt_sysfs_create(struct scst_dev_type *devt)
+{
+ int res;
+ struct kobject *parent;
+ const struct attribute **pattr;
+
+ init_completion(&devt->devt_kobj_release_compl);
+
+ if (devt->parent != NULL)
+ parent = &devt->parent->devt_kobj;
+ else
+ parent = scst_handlers_kobj;
+
+ res = kobject_init_and_add(&devt->devt_kobj, &scst_devt_ktype,
+ parent, devt->name);
+ if (res != 0) {
+ PRINT_ERROR("Can't add devt %s to sysfs", devt->name);
+ goto out;
+ }
+
+ if (devt->add_device != NULL) {
+ res = sysfs_create_file(&devt->devt_kobj,
+ &scst_devt_mgmt.attr);
+ } else {
+ res = sysfs_create_file(&devt->devt_kobj,
+ &scst_devt_pass_through_mgmt.attr);
+ }
+ if (res != 0) {
+ PRINT_ERROR("Can't add mgmt attr for dev handler %s",
+ devt->name);
+ goto out_err;
+ }
+
+ pattr = devt->devt_attrs;
+ if (pattr != NULL) {
+ while (*pattr != NULL) {
+ res = sysfs_create_file(&devt->devt_kobj, *pattr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add devt attr %s for dev "
+ "handler %s", (*pattr)->name,
+ devt->name);
+ goto out_err;
+ }
+ pattr++;
+ }
+ }
+
+#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
+ if (devt->trace_flags != NULL) {
+ res = sysfs_create_file(&devt->devt_kobj,
+ &devt_trace_attr.attr);
+ if (res != 0) {
+ PRINT_ERROR("Can't add devt trace_flag for dev "
+ "handler %s", devt->name);
+ goto out_err;
+ }
+ }
+#endif
+
+out:
+ return res;
+
+out_err:
+ scst_devt_sysfs_del(devt);
+ goto out;
+}
+
+void scst_devt_sysfs_del(struct scst_dev_type *devt)
+{
+ int rc;
+
+ kobject_del(&devt->devt_kobj);
+ kobject_put(&devt->devt_kobj);
+
+ rc = wait_for_completion_timeout(&devt->devt_kobj_release_compl, HZ);
+ if (rc == 0) {
+ PRINT_INFO("Waiting for releasing of sysfs entry "
+ "for dev handler template %s (%d refs)...", devt->name,
+ atomic_read(&devt->devt_kobj.kref.refcount));
+ wait_for_completion(&devt->devt_kobj_release_compl);
+ PRINT_INFO("Done waiting for releasing sysfs entry "
+ "for dev handler template %s", devt->name);
+ }
+ return;
+}
+
+/**
+ ** Sysfs user info
+ **/
+
+static DEFINE_MUTEX(scst_sysfs_user_info_mutex);
+
+/* All protected by scst_sysfs_user_info_mutex */
+static LIST_HEAD(scst_sysfs_user_info_list);
+static uint32_t scst_sysfs_info_cur_cookie;
+
+/* scst_sysfs_user_info_mutex supposed to be held */
+static struct scst_sysfs_user_info *scst_sysfs_user_find_info(uint32_t cookie)
+{
+ struct scst_sysfs_user_info *info, *res = NULL;
+
+ list_for_each_entry(info, &scst_sysfs_user_info_list,
+ info_list_entry) {
+ if (info->info_cookie == cookie) {
+ res = info;
+ break;
+ }
+ }
+ return res;
+}
+
+/**
+ * scst_sysfs_user_get_info() - get user_info
+ *
+ * Finds the user_info based on cookie and mark it as received the reply by
+ * setting for it flag info_being_executed.
+ *
+ * Returns found entry or NULL.
+ */
+struct scst_sysfs_user_info *scst_sysfs_user_get_info(uint32_t cookie)
+{
+ struct scst_sysfs_user_info *res = NULL;
+
+ mutex_lock(&scst_sysfs_user_info_mutex);
+
+ res = scst_sysfs_user_find_info(cookie);
+ if (res != NULL) {
+ if (!res->info_being_executed)
+ res->info_being_executed = 1;
+ }
+
+ mutex_unlock(&scst_sysfs_user_info_mutex);
+ return res;
+}
+EXPORT_SYMBOL_GPL(scst_sysfs_user_get_info);
+
+/**
+ ** Helper functionality to help target drivers and dev handlers support
+ ** sending events to user space and wait for their completion in a safe
+ ** manner. See samples how to use it in iscsi-scst or scst_user.
+ **/
+
+/**
+ * scst_sysfs_user_add_info() - create and add user_info in the global list
+ *
+ * Creates an info structure and adds it in the info_list.
+ * Returns 0 and out_info on success, error code otherwise.
+ */
+int scst_sysfs_user_add_info(struct scst_sysfs_user_info **out_info)
+{
+ int res = 0;
+ struct scst_sysfs_user_info *info;
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (info == NULL) {
+ PRINT_ERROR("Unable to allocate sysfs user info (size %zd)",
+ sizeof(*info));
+ res = -ENOMEM;
+ goto out;
+ }
+
+ mutex_lock(&scst_sysfs_user_info_mutex);
+
+ while ((info->info_cookie == 0) ||
+ (scst_sysfs_user_find_info(info->info_cookie) != NULL))
+ info->info_cookie = scst_sysfs_info_cur_cookie++;
+
+ init_completion(&info->info_completion);
+
+ list_add_tail(&info->info_list_entry, &scst_sysfs_user_info_list);
+ info->info_in_list = 1;
+
+ *out_info = info;
+
+ mutex_unlock(&scst_sysfs_user_info_mutex);
+
+out:
+ return res;
+}
+EXPORT_SYMBOL_GPL(scst_sysfs_user_add_info);
+
+/**
+ * scst_sysfs_user_del_info - delete and frees user_info
+ */
+void scst_sysfs_user_del_info(struct scst_sysfs_user_info *info)
+{
+
+ mutex_lock(&scst_sysfs_user_info_mutex);
+
+ if (info->info_in_list)
+ list_del(&info->info_list_entry);
+
+ mutex_unlock(&scst_sysfs_user_info_mutex);
+
+ kfree(info);
+ return;
+}
+EXPORT_SYMBOL_GPL(scst_sysfs_user_del_info);
+
+/*
+ * Returns true if the reply received and being processed by another part of
+ * the kernel, false otherwise. Also removes the user_info from the list to
+ * fix for the user space that it missed the timeout.
+ */
+static bool scst_sysfs_user_info_executing(struct scst_sysfs_user_info *info)
+{
+ bool res;
+
+ mutex_lock(&scst_sysfs_user_info_mutex);
+
+ res = info->info_being_executed;
+
+ if (info->info_in_list) {
+ list_del(&info->info_list_entry);
+ info->info_in_list = 0;
+ }
+
+ mutex_unlock(&scst_sysfs_user_info_mutex);
+ return res;
+}
+
+/**
+ * scst_wait_info_completion() - wait an user space event's completion
+ *
+ * Waits for the info request been completed by user space at most timeout
+ * jiffies. If the reply received before timeout and being processed by
+ * another part of the kernel, i.e. scst_sysfs_user_info_executing()
+ * returned true, waits for it to complete indefinitely.
+ *
+ * Returns status of the request completion.
+ */
+int scst_wait_info_completion(struct scst_sysfs_user_info *info,
+ unsigned long timeout)
+{
+ int res, rc;
+
+ TRACE_DBG("Waiting for info %p completion", info);
+
+ while (1) {
+ rc = wait_for_completion_interruptible_timeout(
+ &info->info_completion, timeout);
+ if (rc > 0) {
+ TRACE_DBG("Waiting for info %p finished with %d",
+ info, rc);
+ break;
+ } else if (rc == 0) {
+ if (!scst_sysfs_user_info_executing(info)) {
+ PRINT_ERROR("Timeout waiting for user "
+ "space event %p", info);
+ res = -EBUSY;
+ goto out;
+ } else {
+ /* Req is being executed in the kernel */
+ TRACE_DBG("Keep waiting for info %p completion",
+ info);
+ wait_for_completion(&info->info_completion);
+ break;
+ }
+ } else if (rc != -ERESTARTSYS) {
+ res = rc;
+ PRINT_ERROR("wait_for_completion() failed: %d",
+ res);
+ goto out;
+ } else {
+ TRACE_DBG("Waiting for info %p finished with %d, "
+ "retrying", info, rc);
+ }
+ }
+
+ TRACE_DBG("info %p, status %d", info, info->info_status);
+ res = info->info_status;
+
+out:
+ return res;
+}
+EXPORT_SYMBOL_GPL(scst_wait_info_completion);
+
+int __init scst_sysfs_init(void)
+{
+ int res = 0;
+
+ sysfs_work_thread = kthread_run(sysfs_work_thread_fn,
+ NULL, "scst_uid");
+ if (IS_ERR(sysfs_work_thread)) {
+ res = PTR_ERR(sysfs_work_thread);
+ PRINT_ERROR("kthread_create() for user interface thread "
+ "failed: %d", res);
+ sysfs_work_thread = NULL;
+ goto out;
+ }
+
+ res = kobject_init_and_add(&scst_sysfs_root_kobj,
+ &scst_sysfs_root_ktype, kernel_kobj, "%s", "scst_tgt");
+ if (res != 0)
+ goto sysfs_root_add_error;
+
+ scst_targets_kobj = kobject_create_and_add("targets",
+ &scst_sysfs_root_kobj);
+ if (scst_targets_kobj == NULL)
+ goto targets_kobj_error;
+
+ scst_devices_kobj = kobject_create_and_add("devices",
+ &scst_sysfs_root_kobj);
+ if (scst_devices_kobj == NULL)
+ goto devices_kobj_error;
+
+ scst_sgv_kobj = kzalloc(sizeof(*scst_sgv_kobj), GFP_KERNEL);
+ if (scst_sgv_kobj == NULL)
+ goto sgv_kobj_error;
+
+ res = kobject_init_and_add(scst_sgv_kobj, &sgv_ktype,
+ &scst_sysfs_root_kobj, "%s", "sgv");
+ if (res != 0)
+ goto sgv_kobj_add_error;
+
+ scst_handlers_kobj = kobject_create_and_add("handlers",
+ &scst_sysfs_root_kobj);
+ if (scst_handlers_kobj == NULL)
+ goto handlers_kobj_error;
+
+out:
+ return res;
+
+handlers_kobj_error:
+ kobject_del(scst_sgv_kobj);
+
+sgv_kobj_add_error:
+ kobject_put(scst_sgv_kobj);
+
+sgv_kobj_error:
+ kobject_del(scst_devices_kobj);
+ kobject_put(scst_devices_kobj);
+
+devices_kobj_error:
+ kobject_del(scst_targets_kobj);
+ kobject_put(scst_targets_kobj);
+
+targets_kobj_error:
+ kobject_del(&scst_sysfs_root_kobj);
+
+sysfs_root_add_error:
+ kobject_put(&scst_sysfs_root_kobj);
+
+ kthread_stop(sysfs_work_thread);
+
+ if (res == 0)
+ res = -EINVAL;
+
+ goto out;
+}
+
+void scst_sysfs_cleanup(void)
+{
+
+ PRINT_INFO("%s", "Exiting SCST sysfs hierarchy...");
+
+ kobject_del(scst_sgv_kobj);
+ kobject_put(scst_sgv_kobj);
+
+ kobject_del(scst_devices_kobj);
+ kobject_put(scst_devices_kobj);
+
+ kobject_del(scst_targets_kobj);
+ kobject_put(scst_targets_kobj);
+
+ kobject_del(scst_handlers_kobj);
+ kobject_put(scst_handlers_kobj);
+
+ kobject_del(&scst_sysfs_root_kobj);
+ kobject_put(&scst_sysfs_root_kobj);
+
+ wait_for_completion(&scst_sysfs_root_release_completion);
+ /*
+ * There is a race, when in the release() schedule happens just after
+ * calling complete(), so if we exit and unload scst module immediately,
+ * there will be oops there. So let's give it a chance to quit
+ * gracefully. Unfortunately, current kobjects implementation
+ * doesn't allow better ways to handle it.
+ */
+ msleep(3000);
+
+ if (sysfs_work_thread)
+ kthread_stop(sysfs_work_thread);
+
+ PRINT_INFO("%s", "Exiting SCST sysfs hierarchy done");
+ return;
+}
--
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