Add traceprobe_expand_dentry_args() to expand dentry args. this API is
prepare to support "%pd" print format for kprobe.
Signed-off-by: Ye Bin <yebi...@huawei.com>
---
kernel/trace/trace_probe.c | 36 ++++++++++++++++++++++++++++++++++++
kernel/trace/trace_probe.h | 2 ++
2 files changed, 38 insertions(+)
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 4dc74d73fc1d..cc8bd7ea5341 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -1565,6 +1565,42 @@ const char **traceprobe_expand_meta_args(int argc, const
char *argv[],
return ERR_PTR(ret);
}
+int traceprobe_expand_dentry_args(int argc, const char *argv[], char *buf,
+ int bufsize)
+{
+ int i, used, ret;
+
+ used = 0;
+ for (i = 0; i < argc; i++) {
+ size_t idx;
+
+ if (str_has_suffix(argv[i], ":%pd", &idx)) {
+ char *tmp = kstrdup(argv[i], GFP_KERNEL);
+ char *equal;
+
+ if (!tmp)
+ return -ENOMEM;
+
+ equal = strchr(tmp, '=');
+ if (equal)
+ *equal = '\0';
+ tmp[idx] = '\0';
+ ret = snprintf(buf + used, bufsize - used,
+ "%s%s+0x0(+0x%zx(%s)):string",
+ equal ? tmp : "", equal ? "=" : "",
+ offsetof(struct dentry, d_name.name),
+ equal ? equal + 1 : tmp);
+ kfree(tmp);
+ if (ret >= bufsize - used)
+ return -ENOMEM;
+ argv[i] = buf + used;
+ used += ret + 1;
+ }
+ }
+
+ return 0;
+}
+
void traceprobe_finish_parse(struct traceprobe_parse_context *ctx)
{
clear_btf_context(ctx);
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 850d9ecb6765..553371a4e0b1 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -402,6 +402,8 @@ extern int traceprobe_parse_probe_arg(struct trace_probe
*tp, int i,
const char **traceprobe_expand_meta_args(int argc, const char *argv[],
int *new_argc, char *buf, int bufsize,
struct traceprobe_parse_context *ctx);
+extern int traceprobe_expand_dentry_args(int argc, const char *argv[], char
*buf,
+ int bufsize);
extern int traceprobe_update_arg(struct probe_arg *arg);
extern void traceprobe_free_probe_arg(struct probe_arg *arg);
--
2.31.1
