cregit-Linux how code gets into the kernel

Release 4.11 block/blk-mq-sysfs.c

Directory: block
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/backing-dev.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/smp.h>

#include <linux/blk-mq.h>
#include "blk-mq.h"
#include "blk-mq-tag.h"


static void blk_mq_sysfs_release(struct kobject *kobj) { }

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static void blk_mq_hw_sysfs_release(struct kobject *kobj) { struct blk_mq_hw_ctx *hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); free_cpumask_var(hctx->cpumask); kfree(hctx->ctxs); kfree(hctx); }

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struct blk_mq_ctx_sysfs_entry { struct attribute attr; ssize_t (*show)(struct blk_mq_ctx *, char *); ssize_t (*store)(struct blk_mq_ctx *, const char *, size_t); }; struct blk_mq_hw_ctx_sysfs_entry { struct attribute attr; ssize_t (*show)(struct blk_mq_hw_ctx *, char *); ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t); };
static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr, char *page) { struct blk_mq_ctx_sysfs_entry *entry; struct blk_mq_ctx *ctx; struct request_queue *q; ssize_t res; entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr); ctx = container_of(kobj, struct blk_mq_ctx, kobj); q = ctx->queue; if (!entry->show) return -EIO; res = -ENOENT; mutex_lock(&q->sysfs_lock); if (!blk_queue_dying(q)) res = entry->show(ctx, page); mutex_unlock(&q->sysfs_lock); return res; }

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static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr, const char *page, size_t length) { struct blk_mq_ctx_sysfs_entry *entry; struct blk_mq_ctx *ctx; struct request_queue *q; ssize_t res; entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr); ctx = container_of(kobj, struct blk_mq_ctx, kobj); q = ctx->queue; if (!entry->store) return -EIO; res = -ENOENT; mutex_lock(&q->sysfs_lock); if (!blk_queue_dying(q)) res = entry->store(ctx, page, length); mutex_unlock(&q->sysfs_lock); return res; }

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static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj, struct attribute *attr, char *page) { struct blk_mq_hw_ctx_sysfs_entry *entry; struct blk_mq_hw_ctx *hctx; struct request_queue *q; ssize_t res; entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); q = hctx->queue; if (!entry->show) return -EIO; res = -ENOENT; mutex_lock(&q->sysfs_lock); if (!blk_queue_dying(q)) res = entry->show(hctx, page); mutex_unlock(&q->sysfs_lock); return res; }

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static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj, struct attribute *attr, const char *page, size_t length) { struct blk_mq_hw_ctx_sysfs_entry *entry; struct blk_mq_hw_ctx *hctx; struct request_queue *q; ssize_t res; entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); q = hctx->queue; if (!entry->store) return -EIO; res = -ENOENT; mutex_lock(&q->sysfs_lock); if (!blk_queue_dying(q)) res = entry->store(hctx, page, length); mutex_unlock(&q->sysfs_lock); return res; }

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static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx, char *page) { return sprintf(page, "%u\n", hctx->tags->nr_tags); }

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static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx, char *page) { return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags); }

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static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page) { unsigned int i, first = 1; ssize_t ret = 0; for_each_cpu(i, hctx->cpumask) { if (first) ret += sprintf(ret + page, "%u", i); else ret += sprintf(ret + page, ", %u", i); first = 0; } ret += sprintf(ret + page, "\n"); return ret; }

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static struct attribute *default_ctx_attrs[] = { NULL, }; static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = { .attr = {.name = "nr_tags", .mode = S_IRUGO }, .show = blk_mq_hw_sysfs_nr_tags_show, }; static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = { .attr = {.name = "nr_reserved_tags", .mode = S_IRUGO }, .show = blk_mq_hw_sysfs_nr_reserved_tags_show, }; static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = { .attr = {.name = "cpu_list", .mode = S_IRUGO }, .show = blk_mq_hw_sysfs_cpus_show, }; static struct attribute *default_hw_ctx_attrs[] = { &blk_mq_hw_sysfs_nr_tags.attr, &blk_mq_hw_sysfs_nr_reserved_tags.attr, &blk_mq_hw_sysfs_cpus.attr, NULL, }; static const struct sysfs_ops blk_mq_sysfs_ops = { .show = blk_mq_sysfs_show, .store = blk_mq_sysfs_store, }; static const struct sysfs_ops blk_mq_hw_sysfs_ops = { .show = blk_mq_hw_sysfs_show, .store = blk_mq_hw_sysfs_store, }; static struct kobj_type blk_mq_ktype = { .sysfs_ops = &blk_mq_sysfs_ops, .release = blk_mq_sysfs_release, }; static struct kobj_type blk_mq_ctx_ktype = { .sysfs_ops = &blk_mq_sysfs_ops, .default_attrs = default_ctx_attrs, .release = blk_mq_sysfs_release, }; static struct kobj_type blk_mq_hw_ktype = { .sysfs_ops = &blk_mq_hw_sysfs_ops, .default_attrs = default_hw_ctx_attrs, .release = blk_mq_hw_sysfs_release, };
static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx) { struct blk_mq_ctx *ctx; int i; if (!hctx->nr_ctx) return; hctx_for_each_ctx(hctx, ctx, i) kobject_del(&ctx->kobj); kobject_del(&hctx->kobj); }

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static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx) { struct request_queue *q = hctx->queue; struct blk_mq_ctx *ctx; int i, ret; if (!hctx->nr_ctx) return 0; ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num); if (ret) return ret; hctx_for_each_ctx(hctx, ctx, i) { ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu); if (ret) break; } return ret; }

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static void __blk_mq_unregister_dev(struct device *dev, struct request_queue *q) { struct blk_mq_hw_ctx *hctx; int i; queue_for_each_hw_ctx(q, hctx, i) blk_mq_unregister_hctx(hctx); blk_mq_debugfs_unregister_hctxs(q); kobject_uevent(&q->mq_kobj, KOBJ_REMOVE); kobject_del(&q->mq_kobj); kobject_put(&dev->kobj); q->mq_sysfs_init_done = false; }

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Matias Björling79.46%112.50%
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Omar Sandoval56.76%225.00%
Total74100.00%8100.00%


void blk_mq_unregister_dev(struct device *dev, struct request_queue *q) { blk_mq_disable_hotplug(); __blk_mq_unregister_dev(dev, q); blk_mq_enable_hotplug(); }

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void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx) { kobject_init(&hctx->kobj, &blk_mq_hw_ktype); }

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void blk_mq_sysfs_deinit(struct request_queue *q) { struct blk_mq_ctx *ctx; int cpu; for_each_possible_cpu(cpu) { ctx = per_cpu_ptr(q->queue_ctx, cpu); kobject_put(&ctx->kobj); } kobject_put(&q->mq_kobj); }

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void blk_mq_sysfs_init(struct request_queue *q) { struct blk_mq_ctx *ctx; int cpu; kobject_init(&q->mq_kobj, &blk_mq_ktype); for_each_possible_cpu(cpu) { ctx = per_cpu_ptr(q->queue_ctx, cpu); kobject_init(&ctx->kobj, &blk_mq_ctx_ktype); } }

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int blk_mq_register_dev(struct device *dev, struct request_queue *q) { struct blk_mq_hw_ctx *hctx; int ret, i; blk_mq_disable_hotplug(); ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq"); if (ret < 0) goto out; kobject_uevent(&q->mq_kobj, KOBJ_ADD); blk_mq_debugfs_register(q, kobject_name(&dev->kobj)); queue_for_each_hw_ctx(q, hctx, i) { ret = blk_mq_register_hctx(hctx); if (ret) break; } if (ret) __blk_mq_unregister_dev(dev, q); else q->mq_sysfs_init_done = true; out: blk_mq_enable_hotplug(); return ret; }

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Jens Axboe9170.00%240.00%
Akinobu Mita1813.85%120.00%
Omar Sandoval1310.00%120.00%
Matias Björling86.15%120.00%
Total130100.00%5100.00%

EXPORT_SYMBOL_GPL(blk_mq_register_dev);
void blk_mq_sysfs_unregister(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; int i; if (!q->mq_sysfs_init_done) return; blk_mq_debugfs_unregister_hctxs(q); queue_for_each_hw_ctx(q, hctx, i) blk_mq_unregister_hctx(hctx); }

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Jens Axboe3170.45%250.00%
Akinobu Mita818.18%125.00%
Omar Sandoval511.36%125.00%
Total44100.00%4100.00%


int blk_mq_sysfs_register(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; int i, ret = 0; if (!q->mq_sysfs_init_done) return ret; blk_mq_debugfs_register_hctxs(q); queue_for_each_hw_ctx(q, hctx, i) { ret = blk_mq_register_hctx(hctx); if (ret) break; } return ret; }

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Jens Axboe4775.81%250.00%
Akinobu Mita1016.13%125.00%
Omar Sandoval58.06%125.00%
Total62100.00%4100.00%


Overall Contributors

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Jens Axboe138283.00%733.33%
Lei Ming975.83%314.29%
Omar Sandoval533.18%314.29%
Akinobu Mita452.70%14.76%
Matias Björling281.68%14.76%
Keith Busch211.26%14.76%
Andrey Vagin160.96%14.76%
Thomas Gleixner150.90%14.76%
Mike Snitzer40.24%14.76%
Ming Lei20.12%14.76%
Fengguang Wu20.12%14.76%
Total1665100.00%21100.00%
Directory: block
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