From: Christoph Hellwig <hch@lst.de>
Date: Wed, 20 Apr 2022 06:27:12 +0200
Subject: blk-cgroup: move blkcg_{get,set}_fc_appid out of line
Patch-mainline: v5.19-rc1
Git-commit: db05628435aa761d30b4eae481a82befe7a8492a
References: bsc#1200045
No need to have these helpers inline. Also remove the stubs and just use
an IS_ENABLED for the get side (the set side already is only built
conditionlly).
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220420042723.1010598-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
block/Makefile | 1 +
block/blk-cgroup-fc-appid.c | 57 ++++++++++++++++++++++++++++++++++
drivers/scsi/lpfc/lpfc_scsi.c | 4 ++-
include/linux/blk-cgroup.h | 58 ++---------------------------------
4 files changed, 63 insertions(+), 57 deletions(-)
create mode 100644 block/blk-cgroup-fc-appid.c
diff --git a/block/Makefile b/block/Makefile
index 3950ecbc5c26..4e01bb71ad6e 100644
--- a/block/Makefile
+++ b/block/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_BLK_DEV_BSG_COMMON) += bsg.o
obj-$(CONFIG_BLK_DEV_BSGLIB) += bsg-lib.o
obj-$(CONFIG_BLK_CGROUP) += blk-cgroup.o
obj-$(CONFIG_BLK_CGROUP_RWSTAT) += blk-cgroup-rwstat.o
+obj-$(CONFIG_BLK_CGROUP_FC_APPID) += blk-cgroup-fc-appid.o
obj-$(CONFIG_BLK_DEV_THROTTLING) += blk-throttle.o
obj-$(CONFIG_BLK_CGROUP_IOPRIO) += blk-ioprio.o
obj-$(CONFIG_BLK_CGROUP_IOLATENCY) += blk-iolatency.o
diff --git a/block/blk-cgroup-fc-appid.c b/block/blk-cgroup-fc-appid.c
new file mode 100644
index 000000000000..760a2e1878dd
--- /dev/null
+++ b/block/blk-cgroup-fc-appid.c
@@ -0,0 +1,57 @@
+// 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 (!cgrp)
+ return -ENOENT;
+ 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.
+ */
+ strlcpy(blkcg->fc_app_id, app_id, app_id_len);
+ css_put(css);
+out_cgrp_put:
+ cgroup_put(cgrp);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(blkcg_set_fc_appid);
+
+/**
+ * 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;
+}
+EXPORT_SYMBOL_GPL(blkcg_get_fc_appid);
diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index ba9dbb51b75f..f6b83853f7ee 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -5528,7 +5528,9 @@ static char *lpfc_is_command_vm_io(struct scsi_cmnd *cmd)
{
struct bio *bio = scsi_cmd_to_rq(cmd)->bio;
- return bio ? blkcg_get_fc_appid(bio) : NULL;
+ if (!IS_ENABLED(CONFIG_BLK_CGROUP_FC_APPID) || !bio)
+ return NULL;
+ return blkcg_get_fc_appid(bio);
}
/**
diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
index 652cd05b0924..7a2f7de30173 100644
--- a/include/linux/blk-cgroup.h
+++ b/include/linux/blk-cgroup.h
@@ -218,61 +218,7 @@ static inline struct blkcg *bio_blkcg(struct bio *bio) { return NULL; }
#endif /* CONFIG_BLK_CGROUP */
-#ifdef CONFIG_BLK_CGROUP_FC_APPID
-/*
- * Sets the fc_app_id field associted to blkcg
- * @app_id: application identifier
- * @cgrp_id: cgroup id
- * @app_id_len: size of application identifier
- */
-static inline 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 (!cgrp)
- return -ENOENT;
- 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.
- */
- strlcpy(blkcg->fc_app_id, app_id, app_id_len);
- css_put(css);
-out_cgrp_put:
- cgroup_put(cgrp);
- return ret;
-}
+int blkcg_set_fc_appid(char *app_id, u64 cgrp_id, size_t app_id_len);
+char *blkcg_get_fc_appid(struct bio *bio);
-/**
- * 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
- */
-static inline char *blkcg_get_fc_appid(struct bio *bio)
-{
- if (bio && bio->bi_blkg &&
- (bio->bi_blkg->blkcg->fc_app_id[0] != '\0'))
- return bio->bi_blkg->blkcg->fc_app_id;
- return NULL;
-}
-#else
-static inline int blkcg_set_fc_appid(char *buf, u64 id, size_t len) { return -EINVAL; }
-static inline char *blkcg_get_fc_appid(struct bio *bio) { return NULL; }
-#endif /*CONFIG_BLK_CGROUP_FC_APPID*/
#endif /* _BLK_CGROUP_H */
--
2.35.3