blob: 3ec21333f393b79a6650ff0f214f217fe666bed5 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
#include "blk-cgroup.h"
* blkcg_set_fc_appid - set the fc_app_id field associted to blkcg
* @app_id: application identifier
* @cgrp_id: cgroup id
* @app_id_len: size of application identifier
int blkcg_set_fc_appid(char *app_id, u64 cgrp_id, size_t app_id_len)
struct cgroup *cgrp;
struct cgroup_subsys_state *css;
struct blkcg *blkcg;
int ret = 0;
if (app_id_len > FC_APPID_LEN)
return -EINVAL;
cgrp = cgroup_get_from_id(cgrp_id);
if (IS_ERR(cgrp))
return PTR_ERR(cgrp);
css = cgroup_get_e_css(cgrp, &io_cgrp_subsys);
if (!css) {
ret = -ENOENT;
goto out_cgrp_put;
blkcg = css_to_blkcg(css);
* There is a slight race condition on setting the appid.
* Worst case an I/O may not find the right id.
* This is no different from the I/O we let pass while obtaining
* the vmid from the fabric.
* Adding the overhead of a lock is not necessary.
strscpy(blkcg->fc_app_id, app_id, app_id_len);
return ret;
* blkcg_get_fc_appid - get the fc app identifier associated with a bio
* @bio: target bio
* On success return the fc_app_id, on failure return NULL
char *blkcg_get_fc_appid(struct bio *bio)
if (!bio->bi_blkg || bio->bi_blkg->blkcg->fc_app_id[0] == '\0')
return NULL;
return bio->bi_blkg->blkcg->fc_app_id;