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boundary="===============7774488865474756102==" Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org --===============7774488865474756102== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000005d91d205b2070bb9" --0000000000005d91d205b2070bb9 This Patch added a unique application identifier i.e app_id knob to blkcg which allows identification of traffic sources at an individual cgroup based Applications (ex:virtual machine (VM))level in both host and fabric infrastructure. Provided the interface blkcg_get_app_identifier to grab the app identifier associated with a bio. Provided the interface blkcg_set_app_identifier to set the app identifier in a blkcgrp associated with cgroup id Signed-off-by: Muneendra --- v2: renamed app_identifier to app_id removed the sysfs interface blkio.app_identifie under /sys/fs/cgroup/blkio Added a new interface blkcg_set_app_identifier --- block/blk-cgroup.c | 31 +++++++++++++++++++++++++++++++ include/linux/blk-cgroup.h | 22 ++++++++++++++++++++++ 2 files changed, 53 insertions(+) diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 619a79b51068..672971521010 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -546,6 +546,37 @@ static struct blkcg_gq *blkg_lookup_check(struct blkcg *blkcg, return __blkg_lookup(blkcg, q, true /* update_hint */); } +/* + * Sets the app_identifier field associted to blkcg + * @buf: application identifier + * @id: cgrp id + * @len: size of appid + */ +int blkcg_set_app_identifier(char *buf, u64 id, size_t len) +{ + struct cgroup *cgrp = NULL; + struct cgroup_subsys_state *css = NULL; + struct blkcg *blkcg = NULL; + + cgrp = cgroup_get_from_kernfs_id(id); + if (!cgrp) + return -ENOENT; + + css = cgroup_get_e_css(cgrp, &io_cgrp_subsys); + if (!css) + return -ENOENT; + + blkcg = css_to_blkcg(css); + if (!blkcg) + return -ENOENT; + + if (len > APPID_LEN) + return -EINVAL; + strlcpy(blkcg->app_id, buf, len); + return 0; +} +EXPORT_SYMBOL(blkcg_set_app_identifier); + /** * blkg_conf_prep - parse and prepare for per-blkg config update * @inputp: input string pointer diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h index c8fc9792ac77..5bd3f9f397ac 100644 --- a/include/linux/blk-cgroup.h +++ b/include/linux/blk-cgroup.h @@ -30,6 +30,8 @@ /* Max limits for throttle policy */ #define THROTL_IOPS_MAX UINT_MAX +#define APPID_LEN 128 + #ifdef CONFIG_BLK_CGROUP @@ -55,6 +57,8 @@ struct blkcg { struct blkcg_policy_data *cpd[BLKCG_MAX_POLS]; struct list_head all_blkcgs_node; + char app_id[APPID_LEN]; + #ifdef CONFIG_CGROUP_WRITEBACK struct list_head cgwb_list; #endif @@ -206,6 +210,24 @@ struct gendisk *blkcg_conf_get_disk(char **inputp); int blkg_conf_prep(struct blkcg *blkcg, const struct blkcg_policy *pol, char *input, struct blkg_conf_ctx *ctx); void blkg_conf_finish(struct blkg_conf_ctx *ctx); +int blkcg_set_app_identifier(char *buf, u64 id, size_t len); + +/** + * blkcg_get_app_identifier - grab the app identifier associated with a bio + * @bio: target bio + * + * This returns the app identifier associated with a bio, + * %NULL if not associated. + * Callers are expected to either handle %NULL or know association has been + * done prior to calling this. + */ +static inline char *blkcg_get_app_identifier(struct bio *bio) +{ + if (bio && bio->bi_blkg && + strlen(bio->bi_blkg->blkcg->app_id)) + return bio->bi_blkg->blkcg->app_id; + return NULL; +} /** * blkcg_css - find the current css -- 2.26.2 --0000000000005d91d205b2070bb9 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 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