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linux-v5.9.patch
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linux-v5.9.patch
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From d6daeb5f64790e2bf8f52c8f43e7883ae979ae4c Mon Sep 17 00:00:00 2001
From: Dongli Zhang <[email protected]>
Date: Mon, 14 Dec 2020 10:57:37 -0800
Subject: [PATCH 1/1] linux v5.9
Signed-off-by: Dongli Zhang <[email protected]>
---
block/bfq-iosched.c | 14 +
block/bio.c | 4 +
block/blk-cgroup-rwstat.c | 11 +
block/blk-cgroup.c | 87 ++++
block/blk-core.c | 300 ++++++++++++
block/blk-crypto-internal.h | 5 +
block/blk-iocost.c | 47 ++
block/blk-iolatency.c | 59 +++
block/blk-lib.c | 61 +++
block/blk-mq-cpumap.c | 25 +
block/blk-mq-debugfs.c | 3 +
block/blk-mq-sched.c | 34 ++
block/blk-mq-sched.h | 8 +
block/blk-mq-tag.c | 235 ++++++++++
block/blk-mq-tag.h | 40 ++
block/blk-mq-virtio.c | 5 +
block/blk-mq.c | 459 +++++++++++++++++++
block/blk-rq-qos.h | 4 +
block/blk-settings.c | 33 ++
block/blk-throttle.c | 94 ++++
block/bounce.c | 10 +
block/elevator.c | 6 +
drivers/md/dm-linear.c | 11 +
drivers/md/dm-table.c | 5 +
drivers/md/dm.c | 6 +
drivers/net/tap.c | 5 +
drivers/net/tun.c | 4 +
drivers/net/virtio_net.c | 48 ++
drivers/net/xen-netback/rx.c | 5 +
drivers/scsi/hosts.c | 25 +
drivers/scsi/scsi.c | 66 +++
drivers/scsi/scsi_common.c | 32 ++
drivers/scsi/scsi_debug.c | 17 +
drivers/scsi/scsi_debugfs.c | 7 +
drivers/scsi/scsi_devinfo.c | 7 +
drivers/scsi/scsi_dh.c | 35 ++
drivers/scsi/scsi_error.c | 6 +
drivers/scsi/scsi_ioctl.c | 11 +
drivers/scsi/scsi_lib.c | 104 +++++
drivers/scsi/scsi_lib_dma.c | 10 +
drivers/scsi/scsi_logging.c | 5 +
drivers/scsi/scsi_netlink.c | 4 +
drivers/scsi/scsi_pm.c | 14 +
drivers/scsi/scsi_scan.c | 222 +++++++++
drivers/scsi/scsi_sysfs.c | 15 +
drivers/scsi/scsi_trace.c | 14 +
drivers/scsi/scsicam.c | 5 +
drivers/scsi/sd.c | 38 ++
drivers/scsi/virtio_scsi.c | 400 ++++++++++++++++
drivers/target/loopback/tcm_loop.c | 33 ++
drivers/target/target_core_configfs.c | 28 ++
drivers/target/target_core_fabric_configfs.c | 3 +
drivers/target/target_core_file.c | 39 ++
drivers/target/target_core_hba.c | 25 +-
drivers/target/target_core_sbc.c | 6 +
drivers/target/target_core_transport.c | 48 ++
drivers/vhost/net.c | 62 +++
drivers/vhost/scsi.c | 129 ++++++
drivers/vhost/vhost.c | 264 +++++++++++
drivers/vhost/vhost.h | 38 ++
fs/eventfd.c | 11 +
include/linux/blk-cgroup.h | 8 +
include/linux/blk-mq.h | 39 ++
include/linux/blkdev.h | 16 +
include/linux/kernel.h | 10 +
include/linux/kvm_host.h | 11 +
include/linux/overflow.h | 9 +
include/linux/poll.h | 7 +
include/linux/sched.h | 17 +
include/scsi/scsi_device.h | 49 ++
include/scsi/scsi_host.h | 42 ++
include/uapi/linux/virtio_scsi.h | 7 +
kernel/locking/mutex.c | 13 +
kernel/panic.c | 9 +
kernel/sched/core.c | 16 +
kernel/sched/cputime.c | 8 +
kernel/sched/sched.h | 8 +
mm/slub.c | 10 +
net/core/dev.c | 17 +
net/ipv4/devinet.c | 13 +
net/packet/af_packet.c | 91 ++++
virt/kvm/kvm_main.c | 50 ++
82 files changed, 3800 insertions(+), 1 deletion(-)
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index fa98470df3f0..750660c538ee 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -132,6 +132,13 @@
#include "bfq-iosched.h"
#include "blk-wbt.h"
+/*
+ * 从block/bfq-iosched.c又分裂出了如下三个文件:
+ * create mode 100644 block/bfq-cgroup.c
+ * create mode 100644 block/bfq-iosched.h
+ * create mode 100644 block/bfq-wf2q.c
+ */
+
#define BFQ_BFQQ_FNS(name) \
void bfq_mark_bfqq_##name(struct bfq_queue *bfqq) \
{ \
@@ -6809,6 +6816,13 @@ static int __init bfq_init(void)
int ret;
#ifdef CONFIG_BFQ_GROUP_IOSCHED
+ /*
+ * 在以下调用blkcg_policy_register():
+ * - block/bfq-iosched.c|6812| <<bfq_init>> ret = blkcg_policy_register(&blkcg_policy_bfq);
+ * - block/blk-iocost.c|2528| <<ioc_init>> return blkcg_policy_register(&blkcg_policy_iocost);
+ * - block/blk-iolatency.c|1044| <<iolatency_init>> return blkcg_policy_register(&blkcg_policy_iolatency);
+ * - block/blk-throttle.c|2477| <<throtl_init>> return blkcg_policy_register(&blkcg_policy_throtl);
+ */
ret = blkcg_policy_register(&blkcg_policy_bfq);
if (ret)
return ret;
diff --git a/block/bio.c b/block/bio.c
index e865ea55b9f9..8ccd44620237 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -335,6 +335,10 @@ static void bio_chain_endio(struct bio *bio)
*
* The caller must not set bi_private or bi_end_io in @bio.
*/
+/*
+ * 核心思想是把bio->bi_private = parent
+ * bio->bi_end_io = bio_chain_endio
+ */
void bio_chain(struct bio *bio, struct bio *parent)
{
BUG_ON(bio->bi_private || bio->bi_end_io);
diff --git a/block/blk-cgroup-rwstat.c b/block/blk-cgroup-rwstat.c
index 85d5790ac49b..8468dacc5982 100644
--- a/block/blk-cgroup-rwstat.c
+++ b/block/blk-cgroup-rwstat.c
@@ -5,6 +5,17 @@
*/
#include "blk-cgroup-rwstat.h"
+/*
+ * called by:
+ * - block/bfq-cgroup.c|464| <<bfqg_stats_init>> if (blkg_rwstat_init(&stats->bytes, gfp) ||
+ * - block/bfq-cgroup.c|465| <<bfqg_stats_init>> blkg_rwstat_init(&stats->ios, gfp))
+ * - block/bfq-cgroup.c|469| <<bfqg_stats_init>> if (blkg_rwstat_init(&stats->merged, gfp) ||
+ * - block/bfq-cgroup.c|470| <<bfqg_stats_init>> blkg_rwstat_init(&stats->service_time, gfp) ||
+ * - block/bfq-cgroup.c|471| <<bfqg_stats_init>> blkg_rwstat_init(&stats->wait_time, gfp) ||
+ * - block/bfq-cgroup.c|472| <<bfqg_stats_init>> blkg_rwstat_init(&stats->queued, gfp) ||
+ * - block/blk-throttle.c|496| <<throtl_pd_alloc>> if (blkg_rwstat_init(&tg->stat_bytes, gfp))
+ * - block/blk-throttle.c|499| <<throtl_pd_alloc>> if (blkg_rwstat_init(&tg->stat_ios, gfp))
+ */
int blkg_rwstat_init(struct blkg_rwstat *rwstat, gfp_t gfp)
{
int i, ret;
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index c195365c9817..ed73f92b45a9 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -34,6 +34,14 @@
#define MAX_KEY_LEN 100
+/*
+ * 在以下调用blkcg_policy_register():
+ * - block/bfq-iosched.c|6812| <<bfq_init>> ret = blkcg_policy_register(&blkcg_policy_bfq);
+ * - block/blk-iocost.c|2528| <<ioc_init>> return blkcg_policy_register(&blkcg_policy_iocost);
+ * - block/blk-iolatency.c|1044| <<iolatency_init>> return blkcg_policy_register(&blkcg_policy_iolatency);
+ * - block/blk-throttle.c|2477| <<throtl_init>> return blkcg_policy_register(&blkcg_policy_throtl);
+ */
+
/*
* blkcg_pol_mutex protects blkcg_policy[] and policy [de]activation.
* blkcg_pol_register_mutex nests outside of it and synchronizes entire
@@ -219,6 +227,12 @@ EXPORT_SYMBOL_GPL(blkg_lookup_slowpath);
* If @new_blkg is %NULL, this function tries to allocate a new one as
* necessary using %GFP_NOWAIT. @new_blkg is always consumed on return.
*/
+/*
+ * called by:
+ * - block/blk-cgroup.c|354| <<blkg_lookup_create>> blkg = blkg_create(pos, q, NULL);
+ * - block/blk-cgroup.c|663| <<__acquires>> blkg = blkg_create(pos, q, new_blkg);
+ * - block/blk-cgroup.c|1145| <<blkcg_init_queue>> blkg = blkg_create(&blkcg_root, q, new_blkg);
+ */
static struct blkcg_gq *blkg_create(struct blkcg *blkcg,
struct request_queue *q,
struct blkcg_gq *new_blkg)
@@ -935,6 +949,9 @@ static struct cftype blkcg_files[] = {
{ } /* terminate */
};
+/*
+ * struct cgroup_subsys io_cgrp_subsys.legacy_cftypes = blkcg_legacy_files[]
+ */
static struct cftype blkcg_legacy_files[] = {
{
.name = "reset_stats",
@@ -1127,6 +1144,10 @@ static int blkcg_css_online(struct cgroup_subsys_state *css)
* RETURNS:
* 0 on success, -errno on failure.
*/
+/*
+ * called by:
+ * - block/blk-core.c|574| <<blk_alloc_queue>> if (blkcg_init_queue(q))
+ */
int blkcg_init_queue(struct request_queue *q)
{
struct blkcg_gq *new_blkg, *blkg;
@@ -1142,6 +1163,12 @@ int blkcg_init_queue(struct request_queue *q)
/* Make sure the root blkg exists. */
rcu_read_lock();
spin_lock_irq(&q->queue_lock);
+ /*
+ * called by:
+ * - block/blk-cgroup.c|354| <<blkg_lookup_create>> blkg = blkg_create(pos, q, NULL);
+ * - block/blk-cgroup.c|663| <<__acquires>> blkg = blkg_create(pos, q, new_blkg);
+ * - block/blk-cgroup.c|1145| <<blkcg_init_queue>> blkg = blkg_create(&blkcg_root, q, new_blkg);
+ */
blkg = blkg_create(&blkcg_root, q, new_blkg);
if (IS_ERR(blkg))
goto err_unlock;
@@ -1239,6 +1266,23 @@ static void blkcg_exit(struct task_struct *tsk)
tsk->throttle_queue = NULL;
}
+/*
+ * 在以下使用io_cgrp_subsys:
+ * - block/bfq-cgroup.c|512| <<bfq_cpd_init>> d->weight = cgroup_subsys_on_dfl(io_cgrp_subsys) ?
+ * - block/bfq-iosched.c|5499| <<bfq_insert_request>> if (!cgroup_subsys_on_dfl(io_cgrp_subsys) && rq->bio)
+ * - block/blk-cgroup.c|1472| <<blkcg_policy_register>> WARN_ON(cgroup_add_dfl_cftypes(&io_cgrp_subsys,
+ * - block/blk-cgroup.c|1475| <<blkcg_policy_register>> WARN_ON(cgroup_add_legacy_cftypes(&io_cgrp_subsys,
+ * - block/blk-cgroup.c|1919| <<blk_cgroup_bio_start>> if (cgroup_subsys_on_dfl(io_cgrp_subsys))
+ * - block/blk-throttle.c|302| <<tg_bps_limit>> if (cgroup_subsys_on_dfl(io_cgrp_subsys) && !blkg->parent)
+ * - block/blk-throttle.c|332| <<tg_iops_limit>> if (cgroup_subsys_on_dfl(io_cgrp_subsys) && !blkg->parent)
+ * - block/blk-throttle.c|555| <<throtl_pd_init>> if (cgroup_subsys_on_dfl(io_cgrp_subsys) && blkg->parent)
+ * - block/blk-throttle.c|1409| <<tg_conf_updated>> if (!cgroup_subsys_on_dfl(io_cgrp_subsys) || !blkg->parent ||
+ * - block/blk-throttle.c|2178| <<blk_throtl_bio>> if (!cgroup_subsys_on_dfl(io_cgrp_subsys)) {
+ * - include/linux/backing-dev.h|248| <<inode_cgwb_enabled>> cgroup_subsys_on_dfl(io_cgrp_subsys) &&
+ * - mm/backing-dev.c|442| <<cgwb_create>> blkcg_css = cgroup_get_e_css(memcg_css->cgroup, &io_cgrp_subsys);
+ * - mm/backing-dev.c|561| <<wb_get_lookup>> blkcg_css = cgroup_get_e_css(memcg_css->cgroup, &io_cgrp_subsys);
+ * - mm/page_io.c|289| <<bio_associate_blkg_from_page>> css = cgroup_e_css(page->mem_cgroup->css.cgroup, &io_cgrp_subsys);
+ */
struct cgroup_subsys io_cgrp_subsys = {
.css_alloc = blkcg_css_alloc,
.css_online = blkcg_css_online,
@@ -1415,6 +1459,13 @@ EXPORT_SYMBOL_GPL(blkcg_deactivate_policy);
* Register @pol with blkcg core. Might sleep and @pol may be modified on
* successful registration. Returns 0 on success and -errno on failure.
*/
+/*
+ * 在以下调用blkcg_policy_register():
+ * - block/bfq-iosched.c|6812| <<bfq_init>> ret = blkcg_policy_register(&blkcg_policy_bfq);
+ * - block/blk-iocost.c|2528| <<ioc_init>> return blkcg_policy_register(&blkcg_policy_iocost);
+ * - block/blk-iolatency.c|1044| <<iolatency_init>> return blkcg_policy_register(&blkcg_policy_iolatency);
+ * - block/blk-throttle.c|2477| <<throtl_init>> return blkcg_policy_register(&blkcg_policy_throtl);
+ */
int blkcg_policy_register(struct blkcg_policy *pol)
{
struct blkcg *blkcg;
@@ -1540,6 +1591,14 @@ bool __blkcg_punt_bio_submit(struct bio *bio)
return false;
spin_lock_bh(&blkg->async_bio_lock);
+ /*
+ * 在以下使用blkcg_gq->async_bios:
+ * - block/blk-cgroup.c|100| <<__blkg_release>> WARN_ON(!bio_list_empty(&blkg->async_bios));
+ * - block/blk-cgroup.c|133| <<blkg_async_bio_workfn>> bio_list_merge(&bios, &blkg->async_bios);
+ * - block/blk-cgroup.c|134| <<blkg_async_bio_workfn>> bio_list_init(&blkg->async_bios);
+ * - block/blk-cgroup.c|170| <<blkg_alloc>> bio_list_init(&blkg->async_bios);
+ * - block/blk-cgroup.c|1594| <<__blkcg_punt_bio_submit>> bio_list_add(&blkg->async_bios, bio);
+ */
bio_list_add(&blkg->async_bios, bio);
spin_unlock_bh(&blkg->async_bio_lock);
@@ -1862,6 +1921,34 @@ static int blk_cgroup_io_type(struct bio *bio)
return BLKG_IOSTAT_READ;
}
+/*
+ * [0] blk_cgroup_bio_start
+ * [0] submit_bio_checks
+ * [0] submit_bio_noacct
+ * [0] submit_bio
+ * [0] submit_bh_wbc.isra.57
+ * [0] ll_rw_block
+ * [0] jread
+ * [0] do_one_pass
+ * [0] jbd2_journal_recover
+ * [0] jbd2_journal_load
+ * [0] ext4_fill_super
+ * [0] mount_bdev
+ * [0] legacy_get_tree
+ * [0] vfs_get_tree
+ * [0] path_mount
+ * [0] init_mount
+ * [0] do_mount_root
+ * [0] mount_block_root
+ * [0] mount_root
+ * [0] prepare_namespace
+ * [0] kernel_init_freeable
+ * [0] kernel_init
+ * [0] ret_from_fork
+ *
+ * called by:
+ * - block/blk-core.c|1059| <<submit_bio_checks>> blk_cgroup_bio_start(bio);
+ */
void blk_cgroup_bio_start(struct bio *bio)
{
int rwd = blk_cgroup_io_type(bio), cpu;
diff --git a/block/blk-core.c b/block/blk-core.c
index 10c08ac50697..6b1e9c768128 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -64,11 +64,25 @@ DEFINE_IDA(blk_queue_ida);
/*
* For queue allocation
*/
+/*
+ * 在以下使用blk_requestq_cachep:
+ * - block/blk-core.c|564| <<blk_alloc_queue>> q = kmem_cache_alloc_node(blk_requestq_cachep,
+ * - block/blk-core.c|640| <<blk_alloc_queue>> kmem_cache_free(blk_requestq_cachep, q);
+ * - block/blk-core.c|1963| <<blk_dev_init>> blk_requestq_cachep = kmem_cache_create("request_queue",
+ * - block/blk-sysfs.c|872| <<blk_free_queue_rcu>> kmem_cache_free(blk_requestq_cachep, q);
+ */
struct kmem_cache *blk_requestq_cachep;
/*
* Controlling structure to kblockd
*/
+/*
+ * 在以下使用kblockd_workqueue:
+ * - block/blk-core.c|1816| <<kblockd_schedule_work>> return queue_work(kblockd_workqueue, work);
+ * - block/blk-core.c|1823| <<kblockd_mod_delayed_work_on>> return mod_delayed_work_on(cpu, kblockd_workqueue, dwork, delay);
+ * - block/blk-core.c|1965| <<blk_dev_init>> kblockd_workqueue = alloc_workqueue("kblockd",
+ * - block/blk-core.c|1967| <<blk_dev_init>> if (!kblockd_workqueue)
+ */
static struct workqueue_struct *kblockd_workqueue;
/**
@@ -107,6 +121,11 @@ bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q)
}
EXPORT_SYMBOL_GPL(blk_queue_flag_test_and_set);
+/*
+ * called by:
+ * - block/blk-flush.c|298| <<blk_kick_flush>> blk_rq_init(q, flush_rq);
+ * - drivers/scsi/scsi_error.c|2353| <<scsi_ioctl_reset>> blk_rq_init(NULL, rq);
+ */
void blk_rq_init(struct request_queue *q, struct request *rq)
{
memset(rq, 0, sizeof(*rq));
@@ -155,6 +174,13 @@ static const char *const blk_op_name[] = {
* string format. Useful in the debugging and tracing bio or request. For
* invalid REQ_OP_XXX it returns string "UNKNOWN".
*/
+/*
+ * called by:
+ * - block/blk-core.c|236| <<print_req_error>> blk_rq_pos(req), req_op(req), blk_op_str(req_op(req)),
+ * - block/blk-mq-debugfs.c|332| <<__blk_mq_debugfs_rq_show>> const char *op_str = blk_op_str(op);
+ * - drivers/block/null_blk_trace.h|51| <<__field>> blk_op_str(__entry->op),
+ * - include/trace/events/f2fs.h|81| <<show_bio_op>> #define show_bio_op(op) blk_op_str(op)
+ */
inline const char *blk_op_str(unsigned int op)
{
const char *op_str = "UNKNOWN";
@@ -213,6 +239,10 @@ int blk_status_to_errno(blk_status_t status)
}
EXPORT_SYMBOL_GPL(blk_status_to_errno);
+/*
+ * called by:
+ * - block/blk-core.c|1616| <<blk_update_request>> print_req_error(req, error, __func__);
+ */
static void print_req_error(struct request *req, blk_status_t status,
const char *caller)
{
@@ -259,6 +289,15 @@ static void req_bio_endio(struct request *rq, struct bio *bio,
bio_endio(bio);
}
+/*
+ * called by:
+ * - block/blk-core.c|1670| <<blk_update_request>> blk_dump_rq_flags(req, "request botched");
+ * - drivers/block/ps3disk.c|190| <<ps3disk_do_request>> blk_dump_rq_flags(req, DEVICE_NAME " bad request");
+ * - drivers/ide/ide-cd.c|741| <<cdrom_newpc_intr>> blk_dump_rq_flags(rq, "cdrom_newpc_intr");
+ * - drivers/ide/ide-cd.c|887| <<ide_cd_do_request>> blk_dump_rq_flags(rq, "ide_cd_do_request");
+ * - drivers/ide/ide-floppy.c|240| <<ide_floppy_do_request>> blk_dump_rq_flags(rq, (rq->rq_disk
+ * - drivers/scsi/sr.c|452| <<sr_init_command>> blk_dump_rq_flags(rq, "Unknown sr command");
+ */
void blk_dump_rq_flags(struct request *rq, char *msg)
{
printk(KERN_INFO "%s: dev %s: flags=%llx\n", msg,
@@ -291,6 +330,13 @@ EXPORT_SYMBOL(blk_dump_rq_flags);
* and blkcg_exit_queue() to be called with queue lock initialized.
*
*/
+/*
+ * called by:
+ * - block/blk-core.c|413| <<blk_cleanup_queue>> blk_sync_queue(q);
+ * - drivers/md/md.c|6278| <<mddev_detach>> blk_sync_queue(mddev->queue);
+ * - drivers/nvme/host/core.c|4651| <<nvme_sync_queues>> blk_sync_queue(ns->queue);
+ * - drivers/nvme/host/core.c|4655| <<nvme_sync_queues>> blk_sync_queue(ctrl->admin_q);
+ */
void blk_sync_queue(struct request_queue *q)
{
del_timer_sync(&q->timeout);
@@ -302,12 +348,25 @@ EXPORT_SYMBOL(blk_sync_queue);
* blk_set_pm_only - increment pm_only counter
* @q: request queue pointer
*/
+/*
+ * called by:
+ * - block/blk-pm.c|76| <<blk_pre_runtime_suspend>> blk_set_pm_only(q);
+ * - drivers/scsi/scsi_lib.c|2520| <<scsi_device_quiesce>> blk_set_pm_only(q);
+ */
void blk_set_pm_only(struct request_queue *q)
{
atomic_inc(&q->pm_only);
}
EXPORT_SYMBOL_GPL(blk_set_pm_only);
+/*
+ * called by:
+ * - block/blk-pm.c|100| <<blk_pre_runtime_suspend>> blk_clear_pm_only(q);
+ * - block/blk-pm.c|134| <<blk_post_runtime_suspend>> blk_clear_pm_only(q);
+ * - block/blk-pm.c|219| <<blk_set_runtime_active>> blk_clear_pm_only(q);
+ * - drivers/scsi/scsi_lib.c|2537| <<scsi_device_quiesce>> blk_clear_pm_only(q);
+ * - drivers/scsi/scsi_lib.c|2562| <<scsi_device_resume>> blk_clear_pm_only(sdev->request_queue);
+ */
void blk_clear_pm_only(struct request_queue *q)
{
int pm_only;
@@ -335,6 +394,15 @@ void blk_put_queue(struct request_queue *q)
}
EXPORT_SYMBOL(blk_put_queue);
+/*
+ * called by:
+ * - block/blk-core.c|436| <<blk_cleanup_queue>> blk_set_queue_dying(q);
+ * - drivers/block/mtip32xx/mtip32xx.c|4217| <<mtip_pci_remove>> blk_set_queue_dying(dd->queue);
+ * - drivers/block/rbd.c|7268| <<do_rbd_remove>> blk_set_queue_dying(rbd_dev->disk->queue);
+ * - drivers/md/dm.c|2348| <<__dm_destroy>> blk_set_queue_dying(md->queue);
+ * - drivers/nvme/host/core.c|105| <<nvme_set_queue_dying>> blk_set_queue_dying(ns->queue);
+ * - drivers/nvme/host/multipath.c|691| <<nvme_mpath_remove_disk>> blk_set_queue_dying(head->disk->queue);
+ */
void blk_set_queue_dying(struct request_queue *q)
{
blk_queue_flag_set(QUEUE_FLAG_DYING, q);
@@ -350,6 +418,17 @@ void blk_set_queue_dying(struct request_queue *q)
blk_mq_wake_waiters(q);
/* Make blk_queue_enter() reexamine the DYING flag. */
+ /*
+ * 在以下使用request_queue->mq_freeze_wq:
+ * - block/blk-core.c|318| <<blk_clear_pm_only>> wake_up_all(&q->mq_freeze_wq);
+ * - block/blk-core.c|353| <<blk_set_queue_dying>> wake_up_all(&q->mq_freeze_wq);
+ * - block/blk-core.c|462| <<blk_queue_enter>> wait_event(q->mq_freeze_wq,
+ * - block/blk-core.c|512| <<blk_queue_usage_counter_release>> wake_up_all(&q->mq_freeze_wq);
+ * - block/blk-core.c|575| <<blk_alloc_queue>> init_waitqueue_head(&q->mq_freeze_wq);
+ * - block/blk-mq.c|157| <<blk_mq_freeze_queue_wait>> wait_event(q->mq_freeze_wq, percpu_ref_is_zero(&q->q_usage_counter));
+ * - block/blk-mq.c|164| <<blk_mq_freeze_queue_wait_timeout>> return wait_event_timeout(q->mq_freeze_wq,
+ * - block/blk-mq.c|204| <<blk_mq_unfreeze_queue>> wake_up_all(&q->mq_freeze_wq);
+ */
wake_up_all(&q->mq_freeze_wq);
}
EXPORT_SYMBOL_GPL(blk_set_queue_dying);
@@ -363,6 +442,65 @@ EXPORT_SYMBOL_GPL(blk_set_queue_dying);
*
* Context: can sleep
*/
+/*
+ * 调用的例子:
+ * - block/blk-mq.c|3262| <<blk_mq_init_queue_data>> blk_cleanup_queue(uninit_q);
+ * - block/bsg-lib.c|331| <<bsg_remove_queue>> blk_cleanup_queue(q);
+ * - block/bsg-lib.c|408| <<bsg_setup_queue>> blk_cleanup_queue(q);
+ * - drivers/block/loop.c|2179| <<loop_add>> blk_cleanup_queue(lo->lo_queue);
+ * - drivers/block/loop.c|2193| <<loop_remove>> blk_cleanup_queue(lo->lo_queue);
+ * - drivers/block/nbd.c|228| <<nbd_dev_remove>> blk_cleanup_queue(q);
+ * - drivers/block/null_blk_main.c|1557| <<null_del_dev>> blk_cleanup_queue(nullb->q);
+ * - drivers/block/null_blk_main.c|1866| <<null_add_dev>> blk_cleanup_queue(nullb->q);
+ * - drivers/block/virtio_blk.c|914| <<virtblk_remove>> blk_cleanup_queue(vblk->disk->queue);
+ * - drivers/block/xen-blkfront.c|1219| <<xlvbd_release_gendisk>> blk_cleanup_queue(info->rq);
+ * - drivers/md/dm.c|1878| <<cleanup_mapped_device>> blk_cleanup_queue(md->queue);
+ * - drivers/md/md.c|5599| <<md_free>> blk_cleanup_queue(mddev->queue);
+ * - drivers/md/md.c|5716| <<md_alloc>> blk_cleanup_queue(mddev->queue);
+ * - drivers/nvdimm/blk.c|234| <<nd_blk_release_queue>> blk_cleanup_queue(q);
+ * - drivers/nvdimm/btt.c|1531| <<btt_blk_init>> blk_cleanup_queue(btt->btt_queue);
+ * - drivers/nvdimm/btt.c|1554| <<btt_blk_init>> blk_cleanup_queue(btt->btt_queue);
+ * - drivers/nvdimm/btt.c|1570| <<btt_blk_cleanup>> blk_cleanup_queue(btt->btt_queue);
+ * - drivers/nvdimm/pmem.c|341| <<pmem_pagemap_cleanup>> blk_cleanup_queue(q);
+ * - drivers/nvme/host/core.c|4009| <<nvme_alloc_ns>> blk_cleanup_queue(ns->queue);
+ * - drivers/nvme/host/core.c|4033| <<nvme_ns_remove>> blk_cleanup_queue(ns->queue);
+ * - drivers/nvme/host/fc.c|2359| <<nvme_fc_ctrl_free>> blk_cleanup_queue(ctrl->ctrl.connect_q);
+ * - drivers/nvme/host/fc.c|2369| <<nvme_fc_ctrl_free>> blk_cleanup_queue(ctrl->ctrl.admin_q);
+ * - drivers/nvme/host/fc.c|2370| <<nvme_fc_ctrl_free>> blk_cleanup_queue(ctrl->ctrl.fabrics_q);
+ * - drivers/nvme/host/fc.c|2831| <<nvme_fc_create_io_queues>> blk_cleanup_queue(ctrl->ctrl.connect_q);
+ * - drivers/nvme/host/fc.c|3568| <<nvme_fc_init_ctrl>> blk_cleanup_queue(ctrl->ctrl.admin_q);
+ * - drivers/nvme/host/fc.c|3570| <<nvme_fc_init_ctrl>> blk_cleanup_queue(ctrl->ctrl.fabrics_q);
+ * - drivers/nvme/host/multipath.c|402| <<nvme_mpath_alloc_disk>> blk_cleanup_queue(q);
+ * - drivers/nvme/host/multipath.c|695| <<nvme_mpath_remove_disk>> blk_cleanup_queue(head->disk->queue);
+ * - drivers/nvme/host/pci.c|1583| <<nvme_dev_remove_admin>> blk_cleanup_queue(dev->ctrl.admin_q);
+ * - drivers/nvme/host/rdma.c|833| <<nvme_rdma_destroy_admin_queue>> blk_cleanup_queue(ctrl->ctrl.admin_q);
+ * - drivers/nvme/host/rdma.c|834| <<nvme_rdma_destroy_admin_queue>> blk_cleanup_queue(ctrl->ctrl.fabrics_q);
+ * - drivers/nvme/host/rdma.c|924| <<nvme_rdma_configure_admin_queue>> blk_cleanup_queue(ctrl->ctrl.admin_q);
+ * - drivers/nvme/host/rdma.c|927| <<nvme_rdma_configure_admin_queue>> blk_cleanup_queue(ctrl->ctrl.fabrics_q);
+ * - drivers/nvme/host/rdma.c|946| <<nvme_rdma_destroy_io_queues>> blk_cleanup_queue(ctrl->ctrl.connect_q);
+ * - drivers/nvme/host/rdma.c|1001| <<nvme_rdma_configure_io_queues>> blk_cleanup_queue(ctrl->ctrl.connect_q);
+ * - drivers/nvme/host/tcp.c|1751| <<nvme_tcp_destroy_io_queues>> blk_cleanup_queue(ctrl->connect_q);
+ * - drivers/nvme/host/tcp.c|1806| <<nvme_tcp_configure_io_queues>> blk_cleanup_queue(ctrl->connect_q);
+ * - drivers/nvme/host/tcp.c|1819| <<nvme_tcp_destroy_admin_queue>> blk_cleanup_queue(ctrl->admin_q);
+ * - drivers/nvme/host/tcp.c|1820| <<nvme_tcp_destroy_admin_queue>> blk_cleanup_queue(ctrl->fabrics_q);
+ * - drivers/nvme/host/tcp.c|1874| <<nvme_tcp_configure_admin_queue>> blk_cleanup_queue(ctrl->admin_q);
+ * - drivers/nvme/host/tcp.c|1877| <<nvme_tcp_configure_admin_queue>> blk_cleanup_queue(ctrl->fabrics_q);
+ * - drivers/nvme/target/loop.c|256| <<nvme_loop_destroy_admin_queue>> blk_cleanup_queue(ctrl->ctrl.admin_q);
+ * - drivers/nvme/target/loop.c|257| <<nvme_loop_destroy_admin_queue>> blk_cleanup_queue(ctrl->ctrl.fabrics_q);
+ * - drivers/nvme/target/loop.c|273| <<nvme_loop_free_ctrl>> blk_cleanup_queue(ctrl->ctrl.connect_q);
+ * - drivers/nvme/target/loop.c|396| <<nvme_loop_configure_admin_queue>> blk_cleanup_queue(ctrl->ctrl.admin_q);
+ * - drivers/nvme/target/loop.c|398| <<nvme_loop_configure_admin_queue>> blk_cleanup_queue(ctrl->ctrl.fabrics_q);
+ * - drivers/nvme/target/loop.c|540| <<nvme_loop_create_io_queues>> blk_cleanup_queue(ctrl->ctrl.connect_q);
+ * - drivers/scsi/scsi_sysfs.c|1441| <<__scsi_remove_device>> blk_cleanup_queue(sdev->request_queue);
+ *
+ * blk_cleanup_queue - shutdown a request queue
+ * @q: request queue to shutdown
+ *
+ * Mark @q DYING, drain all pending requests, mark @q DEAD, destroy and
+ * put it. All future requests will be failed immediately with -ENODEV.
+ *
+ * Context: can sleep
+ */
void blk_cleanup_queue(struct request_queue *q)
{
/* cannot be called from atomic context */
@@ -392,6 +530,21 @@ void blk_cleanup_queue(struct request_queue *q)
/* @q won't process any more request, flush async actions */
del_timer_sync(&q->backing_dev_info->laptop_mode_wb_timer);
+ /*
+ * cancel any pending callbacks on a queue
+ *
+ * The block layer may perform asynchronous callback activity
+ * on a queue, such as calling the unplug function after a timeout.
+ * A block device may call blk_sync_queue to ensure that any
+ * such activity is cancelled, thus allowing it to release resources
+ * that the callbacks might use. The caller must already have made sure
+ * that its ->submit_bio will not re-add plugging prior to calling
+ * this function.
+ *
+ * This function does not cancel any asynchronous activity arising
+ * out of elevator or throttling code. That would require elevator_exit()
+ * and blkcg_exit_queue() to be called with queue lock initialized.
+ */
blk_sync_queue(q);
if (queue_is_mq(q))
@@ -422,6 +575,14 @@ EXPORT_SYMBOL(blk_cleanup_queue);
* @q: request queue pointer
* @flags: BLK_MQ_REQ_NOWAIT and/or BLK_MQ_REQ_PREEMPT
*/
+/*
+ * called by:
+ * - block/blk-core.c|551| <<bio_queue_enter>> ret = blk_queue_enter(q, nowait ? BLK_MQ_REQ_NOWAIT : 0);
+ * - block/blk-mq.c|554| <<blk_mq_alloc_request>> ret = blk_queue_enter(q, flags);
+ * - block/blk-mq.c|604| <<blk_mq_alloc_request_hctx>> ret = blk_queue_enter(q, flags);
+ * - fs/block_dev.c|696| <<bdev_read_page>> result = blk_queue_enter(bdev->bd_disk->queue, 0);
+ * - fs/block_dev.c|732| <<bdev_write_page>> result = blk_queue_enter(bdev->bd_disk->queue, 0);
+ */
int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags)
{
const bool pm = flags & BLK_MQ_REQ_PREEMPT;
@@ -459,6 +620,17 @@ int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags)
*/
smp_rmb();
+ /*
+ * 在以下使用request_queue->mq_freeze_wq:
+ * - block/blk-core.c|318| <<blk_clear_pm_only>> wake_up_all(&q->mq_freeze_wq);
+ * - block/blk-core.c|353| <<blk_set_queue_dying>> wake_up_all(&q->mq_freeze_wq);
+ * - block/blk-core.c|462| <<blk_queue_enter>> wait_event(q->mq_freeze_wq,
+ * - block/blk-core.c|512| <<blk_queue_usage_counter_release>> wake_up_all(&q->mq_freeze_wq);
+ * - block/blk-core.c|575| <<blk_alloc_queue>> init_waitqueue_head(&q->mq_freeze_wq);
+ * - block/blk-mq.c|157| <<blk_mq_freeze_queue_wait>> wait_event(q->mq_freeze_wq, percpu_ref_is_zero(&q->q_usage_counter));
+ * - block/blk-mq.c|164| <<blk_mq_freeze_queue_wait_timeout>> return wait_event_timeout(q->mq_freeze_wq,
+ * - block/blk-mq.c|204| <<blk_mq_unfreeze_queue>> wake_up_all(&q->mq_freeze_wq);
+ */
wait_event(q->mq_freeze_wq,
(!q->mq_freeze_depth &&
(pm || (blk_pm_request_resume(q),
@@ -469,6 +641,11 @@ int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags)
}
}
+/*
+ * called by:
+ * - block/blk-core.c|1223| <<__submit_bio_noacct>> if (unlikely(bio_queue_enter(bio) != 0))
+ * - block/blk-core.c|1268| <<__submit_bio_noacct_mq>> if (unlikely(bio_queue_enter(bio) != 0))
+ */
static inline int bio_queue_enter(struct bio *bio)
{
struct request_queue *q = bio->bi_disk->queue;
@@ -486,6 +663,19 @@ static inline int bio_queue_enter(struct bio *bio)
return ret;
}
+/*
+ * called by:
+ * - block/blk-core.c|1089| <<__submit_bio>> blk_queue_exit(disk->queue);
+ * - block/blk-core.c|1175| <<__submit_bio_noacct_mq>> blk_queue_exit(disk->queue);
+ * - block/blk-mq-tag.c|453| <<blk_mq_queue_tag_busy_iter>> blk_queue_exit(q);
+ * - block/blk-mq.c|422| <<blk_mq_alloc_request>> blk_queue_exit(q);
+ * - block/blk-mq.c|481| <<blk_mq_alloc_request_hctx>> blk_queue_exit(q);
+ * - block/blk-mq.c|501| <<__blk_mq_free_request>> blk_queue_exit(q);
+ * - block/blk-mq.c|1012| <<blk_mq_timeout_work>> blk_queue_exit(q);
+ * - block/blk-mq.c|2264| <<blk_mq_submit_bio>> blk_queue_exit(q);
+ * - fs/block_dev.c|701| <<bdev_read_page>> blk_queue_exit(bdev->bd_disk->queue);
+ * - fs/block_dev.c|745| <<bdev_write_page>> blk_queue_exit(bdev->bd_disk->queue);
+ */
void blk_queue_exit(struct request_queue *q)
{
percpu_ref_put(&q->q_usage_counter);
@@ -496,6 +686,17 @@ static void blk_queue_usage_counter_release(struct percpu_ref *ref)
struct request_queue *q =
container_of(ref, struct request_queue, q_usage_counter);
+ /*
+ * 在以下使用request_queue->mq_freeze_wq:
+ * - block/blk-core.c|318| <<blk_clear_pm_only>> wake_up_all(&q->mq_freeze_wq);
+ * - block/blk-core.c|353| <<blk_set_queue_dying>> wake_up_all(&q->mq_freeze_wq);
+ * - block/blk-core.c|462| <<blk_queue_enter>> wait_event(q->mq_freeze_wq,
+ * - block/blk-core.c|512| <<blk_queue_usage_counter_release>> wake_up_all(&q->mq_freeze_wq);
+ * - block/blk-core.c|575| <<blk_alloc_queue>> init_waitqueue_head(&q->mq_freeze_wq);
+ * - block/blk-mq.c|157| <<blk_mq_freeze_queue_wait>> wait_event(q->mq_freeze_wq, percpu_ref_is_zero(&q->q_usage_counter));
+ * - block/blk-mq.c|164| <<blk_mq_freeze_queue_wait_timeout>> return wait_event_timeout(q->mq_freeze_wq,
+ * - block/blk-mq.c|204| <<blk_mq_unfreeze_queue>> wake_up_all(&q->mq_freeze_wq);
+ */
wake_up_all(&q->mq_freeze_wq);
}
@@ -510,6 +711,30 @@ static void blk_timeout_work(struct work_struct *work)
{
}
+/*
+ * called by:
+ * - arch/m68k/emu/nfblock.c|122| <<nfhd_init_one>> dev->queue = blk_alloc_queue(NUMA_NO_NODE);
+ * - arch/xtensa/platforms/iss/simdisk.c|269| <<simdisk_setup>> dev->queue = blk_alloc_queue(NUMA_NO_NODE);
+ * - block/blk-mq.c|3251| <<blk_mq_init_queue_data>> uninit_q = blk_alloc_queue(set->numa_node);
+ * - drivers/block/brd.c|385| <<brd_alloc>> brd->brd_queue = blk_alloc_queue(NUMA_NO_NODE);
+ * - drivers/block/drbd/drbd_main.c|2749| <<drbd_create_device>> q = blk_alloc_queue(NUMA_NO_NODE);
+ * - drivers/block/null_blk_main.c|1812| <<null_add_dev>> nullb->q = blk_alloc_queue(dev->home_node);
+ * - drivers/block/pktcdvd.c|2753| <<pkt_setup_dev>> disk->queue = blk_alloc_queue(NUMA_NO_NODE);
+ * - drivers/block/ps3vram.c|739| <<ps3vram_probe>> queue = blk_alloc_queue(NUMA_NO_NODE);
+ * - drivers/block/rsxx/dev.c|239| <<rsxx_setup_dev>> card->queue = blk_alloc_queue(NUMA_NO_NODE);
+ * - drivers/block/umem.c|890| <<mm_pci_probe>> card->queue = blk_alloc_queue(NUMA_NO_NODE);
+ * - drivers/block/zram/zram_drv.c|1895| <<zram_add>> queue = blk_alloc_queue(NUMA_NO_NODE);
+ * - drivers/lightnvm/core.c|379| <<nvm_create_tgt>> tqueue = blk_alloc_queue(dev->q->node);
+ * - drivers/md/bcache/super.c|943| <<bcache_device_init>> q = blk_alloc_queue(NUMA_NO_NODE);
+ * - drivers/md/dm.c|1944| <<alloc_dev>> md->queue = blk_alloc_queue(numa_node_id);
+ * - drivers/md/md.c|5708| <<md_alloc>> mddev->queue = blk_alloc_queue(NUMA_NO_NODE);
+ * - drivers/nvdimm/blk.c|254| <<nsblk_attach_disk>> q = blk_alloc_queue(NUMA_NO_NODE);
+ * - drivers/nvdimm/btt.c|1525| <<btt_blk_init>> btt->btt_queue = blk_alloc_queue(NUMA_NO_NODE);
+ * - drivers/nvdimm/pmem.c|425| <<pmem_attach_disk>> q = blk_alloc_queue(dev_to_node(dev));
+ * - drivers/nvme/host/multipath.c|377| <<nvme_mpath_alloc_disk>> q = blk_alloc_queue(ctrl->numa_node);
+ * - drivers/s390/block/dcssblk.c|654| <<dcssblk_add_store>> dev_info->dcssblk_queue = blk_alloc_queue(NUMA_NO_NODE);
+ * - drivers/s390/block/xpram.c|347| <<xpram_setup_blkdev>> xpram_queues[i] = blk_alloc_queue(NUMA_NO_NODE);
+ */
struct request_queue *blk_alloc_queue(int node_id)
{
struct request_queue *q;
@@ -750,6 +975,10 @@ bool bio_attempt_discard_merge(struct request_queue *q, struct request *req,
*
* Caller must ensure !blk_queue_nomerges(q) beforehand.
*/
+/*
+ * called by:
+ * - block/blk-mq.c|2375| <<blk_mq_submit_bio>> blk_attempt_plug_merge(q, bio, nr_segs, &same_queue_rq))
+ */
bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
unsigned int nr_segs, struct request **same_queue_rq)
{
@@ -820,6 +1049,12 @@ static int __init setup_fail_make_request(char *str)
}
__setup("fail_make_request=", setup_fail_make_request);
+/*
+ * called by:
+ * - block/blk-core.c|1095| <<should_fail_bio>> if (should_fail_request(&bio->bi_disk->part0, bio->bi_iter.bi_size))
+ * - block/blk-core.c|1135| <<blk_partition_remap>> if (unlikely(should_fail_request(p, bio->bi_iter.bi_size)))
+ * - block/blk-core.c|1580| <<blk_insert_cloned_request>> should_fail_request(&rq->rq_disk->part0, blk_rq_bytes(rq)))
+ */
static bool should_fail_request(struct hd_struct *part, unsigned int bytes)
{
return part->make_it_fail && should_fail(&fail_make_request, bytes);
@@ -894,6 +1129,10 @@ static inline int bio_check_eod(struct bio *bio, sector_t maxsector)
/*
* Remap block n of partition p to block n+start(p) of the disk.
*/
+/*
+ * called by:
+ * - block/blk-core.c|1208| <<submit_bio_checks>> if (unlikely(blk_partition_remap(bio)))
+ */
static inline int blk_partition_remap(struct bio *bio)
{
struct hd_struct *p;
@@ -957,6 +1196,10 @@ static inline blk_status_t blk_check_zone_append(struct request_queue *q,
return BLK_STS_OK;
}
+/*
+ * called by:
+ * - block/blk-core.c|1423| <<submit_bio_noacct>> if (!submit_bio_checks(bio))
+ */
static noinline_for_stack bool submit_bio_checks(struct bio *bio)
{
struct request_queue *q = bio->bi_disk->queue;
@@ -1076,6 +1319,10 @@ static noinline_for_stack bool submit_bio_checks(struct bio *bio)
return false;
}
+/*
+ * called by:
+ * - block/blk-core.c|1368| <<__submit_bio_noacct>> ret = __submit_bio(bio);
+ */
static blk_qc_t __submit_bio(struct bio *bio)
{
struct gendisk *disk = bio->bi_disk;
@@ -1109,6 +1356,10 @@ static blk_qc_t __submit_bio(struct bio *bio)
* bio_list_on_stack[1] contains bios that were submitted before the current
* ->submit_bio_bio, but that haven't been processed yet.
*/
+/*
+ * called by:
+ * - block/blk-core.c|1447| <<submit_bio_noacct>> return __submit_bio_noacct(bio);
+ */
static blk_qc_t __submit_bio_noacct(struct bio *bio)
{
struct bio_list bio_list_on_stack[2];
@@ -1268,6 +1519,12 @@ blk_qc_t submit_bio(struct bio *bio)
* the submitting cgroup IO-throttled, submission can be a significant
* part of overall IO time.
*/
+ /*
+ * 在以下使用BIO_WORKINGSET:
+ * - block/bio.c|920| <<__bio_add_page>> if (!bio_flagged(bio, BIO_WORKINGSET) && unlikely(PageWorkingset(page)))
+ * - block/bio.c|921| <<__bio_add_page>> bio_set_flag(bio, BIO_WORKINGSET);
+ * - block/blk-core.c|1505| <<submit_bio>> bio_flagged(bio, BIO_WORKINGSET))) {
+ */
if (unlikely(bio_op(bio) == REQ_OP_READ &&
bio_flagged(bio, BIO_WORKINGSET))) {
unsigned long pflags;
@@ -1499,6 +1756,10 @@ EXPORT_SYMBOL(disk_end_io_acct);
* Steal bios from a request and add them to a bio list.
* The request must not have been partially completed before.
*/
+/*
+ * called by:
+ * - drivers/nvme/host/multipath.c|87| <<nvme_failover_req>> blk_steal_bios(&ns->head->requeue_list, req);
+ */
void blk_steal_bios(struct bio_list *list, struct request *rq)
{
if (rq->bio) {
@@ -1542,6 +1803,13 @@ EXPORT_SYMBOL_GPL(blk_steal_bios);
* %false - this request doesn't have any more data
* %true - this request has more data
**/
+/*
+ * 调用的例子:
+ * - block/blk-mq.c|710| <<blk_mq_end_request>> if (blk_update_request(rq, error, blk_rq_bytes(rq)))
+ * - drivers/block/loop.c|486| <<lo_complete_rq>> blk_update_request(rq, BLK_STS_OK, cmd->ret);
+ * - drivers/md/dm-rq.c|120| <<end_clone_bio>> blk_update_request(tio->orig, BLK_STS_OK, tio->completed);
+ * - drivers/scsi/scsi_lib.c|566| <<scsi_end_request>> if (blk_update_request(req, error, bytes))
+ */
bool blk_update_request(struct request *req, blk_status_t error,
unsigned int nr_bytes)
{
@@ -1758,12 +2026,32 @@ int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
}
EXPORT_SYMBOL_GPL(blk_rq_prep_clone);
+/*
+ * called by:
+ * - block/blk-core.c|559| <<blk_rq_timed_out_timer>> kblockd_schedule_work(&q->timeout_work);
+ * - block/blk-timeout.c|87| <<blk_abort_request>> kblockd_schedule_work(&req->q->timeout_work);
+ * - drivers/ide/ide-io.c|907| <<ide_insert_request_head>> kblockd_schedule_work(&drive->rq_work);
+ * - drivers/ide/ide-probe.c|1183| <<drive_rq_insert_work>> kblockd_schedule_work(&drive->rq_work);
+ * - drivers/nvme/host/multipath.c|91| <<nvme_failover_req>> kblockd_schedule_work(&ns->head->requeue_work);
+ * - drivers/nvme/host/multipath.c|101| <<nvme_kick_requeue_lists>> kblockd_schedule_work(&ns->head->requeue_work);
+ * - drivers/nvme/host/multipath.c|142| <<nvme_mpath_clear_ctrl_paths>> kblockd_schedule_work(&ns->head->requeue_work);
+ * - drivers/nvme/host/multipath.c|430| <<nvme_mpath_set_live>> kblockd_schedule_work(&head->requeue_work);
+ * - drivers/nvme/host/multipath.c|693| <<nvme_mpath_remove_disk>> kblockd_schedule_work(&head->requeue_work);
+ * - drivers/nvme/host/nvme.h|673| <<nvme_mpath_check_last_path>> kblockd_schedule_work(&head->requeue_work);
+ * - drivers/scsi/scsi_lib.c|553| <<scsi_run_queue_async>> kblockd_schedule_work(&sdev->requeue_work);
+ */
int kblockd_schedule_work(struct work_struct *work)
{
return queue_work(kblockd_workqueue, work);
}
EXPORT_SYMBOL(kblockd_schedule_work);
+/*
+ * called by:
+ * - block/blk-mq.c|1051| <<blk_mq_kick_requeue_list>> kblockd_mod_delayed_work_on(WORK_CPU_UNBOUND, &q->requeue_work, 0);
+ * - block/blk-mq.c|1058| <<blk_mq_delay_kick_requeue_list>> kblockd_mod_delayed_work_on(WORK_CPU_UNBOUND, &q->requeue_work,
+ * - block/blk-mq.c|1839| <<__blk_mq_delay_run_hw_queue>> kblockd_mod_delayed_work_on(blk_mq_hctx_next_cpu(hctx), &hctx->run_work,
+ */
int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork,
unsigned long delay)
{
@@ -1888,6 +2176,14 @@ void blk_finish_plug(struct blk_plug *plug)
}
EXPORT_SYMBOL(blk_finish_plug);
+/*
+ * called by:
+ * - fs/block_dev.c|247| <<__blkdev_direct_IO_simple>> blk_io_schedule();
+ * - fs/block_dev.c|441| <<__blkdev_direct_IO>> blk_io_schedule();
+ * - fs/direct-io.c|503| <<dio_await_one>> blk_io_schedule();
+ * - fs/iomap/direct-io.c|572| <<iomap_dio_rw>> blk_io_schedule();
+ * - mm/page_io.c|444| <<swap_readpage>> blk_io_schedule();
+ */
void blk_io_schedule(void)
{
/* Prevent hang_check timer from firing at us during very long I/O */
@@ -1900,6 +2196,10 @@ void blk_io_schedule(void)
}
EXPORT_SYMBOL_GPL(blk_io_schedule);
+/*
+ * called by:
+ * - block/genhd.c|1229| <<genhd_device_init>> blk_dev_init();
+ */
int __init blk_dev_init(void)
{
BUILD_BUG_ON(REQ_OP_LAST >= (1 << REQ_OP_BITS));
diff --git a/block/blk-crypto-internal.h b/block/blk-crypto-internal.h
index d2b0f565d83c..146b6120d1af 100644
--- a/block/blk-crypto-internal.h
+++ b/block/blk-crypto-internal.h
@@ -128,6 +128,11 @@ static inline bool blk_crypto_bio_prep(struct bio **bio_ptr)
}
blk_status_t __blk_crypto_init_request(struct request *rq);
+/*
+ * called by:
+ * - block/blk-crypto-internal.h|165| <<blk_crypto_insert_cloned_request>> return blk_crypto_init_request(rq);
+ * - block/blk-mq.c|2400| <<blk_mq_submit_bio>> ret = blk_crypto_init_request(rq);
+ */
static inline blk_status_t blk_crypto_init_request(struct request *rq)
{
if (blk_crypto_rq_is_encrypted(rq))
diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index d37b55db2409..298e72f08506 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -1718,6 +1718,9 @@ static u64 calc_size_vtime_cost(struct request *rq, struct ioc *ioc)
return cost;
}
+/*
+ * struct rq_qos_ops ioc_rqos_ops.throttle = ioc_rqos_throttle()
+ */
static void ioc_rqos_throttle(struct rq_qos *rqos, struct bio *bio)
{
struct blkcg_gq *blkg = bio->bi_blkg;
@@ -1844,6 +1847,9 @@ static void ioc_rqos_throttle(struct rq_qos *rqos, struct bio *bio)
finish_wait(&iocg->waitq, &wait.wait);
}
+/*
+ * struct rq_qos_ops ioc_rqos_ops.merge = ioc_rqos_merge()
+ */
static void ioc_rqos_merge(struct rq_qos *rqos, struct request *rq,
struct bio *bio)
{
@@ -1897,6 +1903,9 @@ static void ioc_rqos_merge(struct rq_qos *rqos, struct request *rq,
spin_unlock_irqrestore(&iocg->waitq.lock, flags);
}
+/*
+ * struct rq_qos_ops ioc_rqos_ops.done_bio = ioc_rqos_done_bio()
+ */
static void ioc_rqos_done_bio(struct rq_qos *rqos, struct bio *bio)
{
struct ioc_gq *iocg = blkg_to_iocg(bio->bi_blkg);
@@ -1905,6 +1914,9 @@ static void ioc_rqos_done_bio(struct rq_qos *rqos, struct bio *bio)
atomic64_add(bio->bi_iocost_cost, &iocg->done_vtime);
}
+/*
+ * struct rq_qos_ops ioc_rqos_ops.done = ioc_rqos_done()
+ */
static void ioc_rqos_done(struct rq_qos *rqos, struct request *rq)
{
struct ioc *ioc = rqos_to_ioc(rqos);
@@ -1940,6 +1952,9 @@ static void ioc_rqos_done(struct rq_qos *rqos, struct request *rq)
this_cpu_add(ioc->pcpu_stat->rq_wait_ns, rq_wait_ns);
}
+/*
+ * struct rq_qos_ops ioc_rqos_ops.queue_depth_changed = ioc_rqos_queue_depth_changed()
+ */
static void ioc_rqos_queue_depth_changed(struct rq_qos *rqos)
{
struct ioc *ioc = rqos_to_ioc(rqos);
@@ -1949,6 +1964,9 @@ static void ioc_rqos_queue_depth_changed(struct rq_qos *rqos)
spin_unlock_irq(&ioc->lock);
}
+/*
+ * struct rq_qos_ops ioc_rqos_ops.exit = ioc_rqos_exit()
+ */
static void ioc_rqos_exit(struct rq_qos *rqos)
{
struct ioc *ioc = rqos_to_ioc(rqos);
@@ -1964,6 +1982,10 @@ static void ioc_rqos_exit(struct rq_qos *rqos)
kfree(ioc);
}
+/*
+ * 在以下使用ioc_rqos_ops:
+ * - block/blk-iocost.c|1994| <<blk_iocost_init>> rqos->ops = &ioc_rqos_ops;
+ */
static struct rq_qos_ops ioc_rqos_ops = {
.throttle = ioc_rqos_throttle,
.merge = ioc_rqos_merge,
@@ -1973,6 +1995,11 @@ static struct rq_qos_ops ioc_rqos_ops = {
.exit = ioc_rqos_exit,
};
+/*
+ * called by:
+ * - block/blk-iocost.c|2262| <<ioc_qos_write>> ret = blk_iocost_init(disk->queue);
+ * - block/blk-iocost.c|2429| <<ioc_cost_model_write>> ret = blk_iocost_init(disk->queue);
+ */
static int blk_iocost_init(struct request_queue *q)
{
struct ioc *ioc;
@@ -2514,6 +2541,19 @@ static struct cftype ioc_files[] = {
{}
};
+/*
+ * 在以下使用blkcg_policy_iocost:
+ * - block/blk-iocost.c|639| <<blkg_to_iocg>> return pd_to_iocg(blkg_to_pd(blkg, &blkcg_policy_iocost));
+ * - block/blk-iocost.c|649| <<blkcg_to_iocc>> return container_of(blkcg_to_cpd(blkcg, &blkcg_policy_iocost),
+ * - block/blk-iocost.c|1956| <<ioc_rqos_exit>> blkcg_deactivate_policy(rqos->q, &blkcg_policy_iocost);
+ * - block/blk-iocost.c|2014| <<blk_iocost_init>> ret = blkcg_activate_policy(q, &blkcg_policy_iocost);
+ * - block/blk-iocost.c|2130| <<ioc_weight_show>> &blkcg_policy_iocost, seq_cft(sf)->private, false);
+ * - block/blk-iocost.c|2169| <<ioc_weight_write>> ret = blkg_conf_prep(blkcg, &blkcg_policy_iocost, buf, &ctx);
+ * - block/blk-iocost.c|2226| <<ioc_qos_show>> &blkcg_policy_iocost, seq_cft(sf)->private, false);
+ * - block/blk-iocost.c|2393| <<ioc_cost_model_show>> &blkcg_policy_iocost, seq_cft(sf)->private, false);
+ * - block/blk-iocost.c|2528| <<ioc_init>> return blkcg_policy_register(&blkcg_policy_iocost);
+ * - block/blk-iocost.c|2533| <<ioc_exit>> return blkcg_policy_unregister(&blkcg_policy_iocost);
+ */
static struct blkcg_policy blkcg_policy_iocost = {
.dfl_cftypes = ioc_files,
.cpd_alloc_fn = ioc_cpd_alloc,
@@ -2525,6 +2565,13 @@ static struct blkcg_policy blkcg_policy_iocost = {
static int __init ioc_init(void)
{
+ /*
+ * 在以下调用blkcg_policy_register():
+ * - block/bfq-iosched.c|6812| <<bfq_init>> ret = blkcg_policy_register(&blkcg_policy_bfq);
+ * - block/blk-iocost.c|2528| <<ioc_init>> return blkcg_policy_register(&blkcg_policy_iocost);
+ * - block/blk-iolatency.c|1044| <<iolatency_init>> return blkcg_policy_register(&blkcg_policy_iolatency);
+ * - block/blk-throttle.c|2477| <<throtl_init>> return blkcg_policy_register(&blkcg_policy_throtl);
+ */
return blkcg_policy_register(&blkcg_policy_iocost);
}
diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c
index f90429cf4edf..3092e9a6d024 100644
--- a/block/blk-iolatency.c
+++ b/block/blk-iolatency.c
@@ -715,6 +715,10 @@ static void blkiolatency_timer_fn(struct timer_list *t)
rcu_read_unlock();
}
+/*
+ * called by:
+ * - block/blk-cgroup.c|1173| <<blkcg_init_queue>> ret = blk_iolatency_init(q);
+ */
int blk_iolatency_init(struct request_queue *q)
{
struct blk_iolatency *blkiolat;
@@ -935,6 +939,39 @@ static size_t iolatency_pd_stat(struct blkg_policy_data *pd, char *buf,
}
+/*
+ * [0] iolatency_pd_alloc
+ * [0] blkg_alloc
+ * [0] blkg_conf_prep
+ * [0] tg_set_conf.constprop.31
+ * [0] cgroup_file_write