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authorChristoph Hellwig <hch@lst.de>2022-04-20 06:27:16 +0200
committerJens Axboe <axboe@kernel.dk>2022-05-02 14:06:20 -0600
commitf4a6a61cb6d40d9ae63e47743d33200f3efe3fe7 (patch)
treeddf10830cb8afd7241a592f5aff2ecbc26cf330a /kernel/trace
parentdec223c92a4688f6c9642d640cfe15a99d289dd4 (diff)
blktrace: cleanup the __trace_note_message interface
Pass the cgroup_subsys_state instead of a the blkg so that blktrace doesn't need to poke into blk-cgroup internals, and give the name a blk prefix as the current name is way too generic for a public interface. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Tejun Heo <tj@kernel.org> Link: https://lore.kernel.org/r/20220420042723.1010598-9-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/blktrace.c20
1 files changed, 10 insertions, 10 deletions
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 4d5629196d01..9ef349ac49c0 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -145,13 +145,14 @@ static void trace_note_time(struct blk_trace *bt)
local_irq_restore(flags);
}
-void __trace_note_message(struct blk_trace *bt, struct blkcg *blkcg,
- const char *fmt, ...)
+void __blk_trace_note_message(struct blk_trace *bt,
+ struct cgroup_subsys_state *css, const char *fmt, ...)
{
int n;
va_list args;
unsigned long flags;
char *buf;
+ u64 cgid = 0;
if (unlikely(bt->trace_state != Blktrace_running &&
!blk_tracer_enabled))
@@ -170,17 +171,16 @@ void __trace_note_message(struct blk_trace *bt, struct blkcg *blkcg,
n = vscnprintf(buf, BLK_TN_MAX_MSG, fmt, args);
va_end(args);
- if (!(blk_tracer_flags.val & TRACE_BLK_OPT_CGROUP))
- blkcg = NULL;
#ifdef CONFIG_BLK_CGROUP
- trace_note(bt, current->pid, BLK_TN_MESSAGE, buf, n,
- blkcg ? cgroup_id(blkcg->css.cgroup) : 1);
-#else
- trace_note(bt, current->pid, BLK_TN_MESSAGE, buf, n, 0);
+ if (css && (blk_tracer_flags.val & TRACE_BLK_OPT_CGROUP))
+ cgid = cgroup_id(css->cgroup);
+ else
+ cgid = 1;
#endif
+ trace_note(bt, current->pid, BLK_TN_MESSAGE, buf, n, cgid);
local_irq_restore(flags);
}
-EXPORT_SYMBOL_GPL(__trace_note_message);
+EXPORT_SYMBOL_GPL(__blk_trace_note_message);
static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector,
pid_t pid)
@@ -411,7 +411,7 @@ static ssize_t blk_msg_write(struct file *filp, const char __user *buffer,
return PTR_ERR(msg);
bt = filp->private_data;
- __trace_note_message(bt, NULL, "%s", msg);
+ __blk_trace_note_message(bt, NULL, "%s", msg);
kfree(msg);
return count;