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