Greg Kroah-Hartman
939565a79b
Link: https://lore.kernel.org/r/20260121181411.452263583@linuxfoundation.org Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Shuah Khan <skhan@linuxfoundation.org> Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Shung-Hsi Yu <shung-hsi.yu@suse.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Francesco Dolcini <francesco.dolcini@toradex.com> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Brett Mastbergen <bmastbergen@ciq.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
// 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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strscpy(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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