Trace file version 7 has more flexible structure than version 6, headers
are not located at fixed position in the file. A new logic is
implemented to read and parse the headers from this new format.
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@xxxxxxxxx>
---
lib/trace-cmd/trace-input.c | 150 ++++++++++++++++++++++++++++++++----
1 file changed, 136 insertions(+), 14 deletions(-)
diff --git a/lib/trace-cmd/trace-input.c b/lib/trace-cmd/trace-input.c
index 2c626d37..e288c55f 100644
--- a/lib/trace-cmd/trace-input.c
+++ b/lib/trace-cmd/trace-input.c
@@ -164,7 +164,8 @@ struct tracecmd_input {
struct pid_addr_maps *pid_maps;
/* file information */
struct file_section *sections;
- size_t options_start;
+ bool options_init;
+ unsigned long long options_start;
size_t total_file_size;
/* For custom profilers. */
@@ -961,19 +962,7 @@ static int read_cpus(struct tracecmd_input *handle)
return 0;
}
-/**
- * tracecmd_read_headers - read the header information from trace.dat
- * @handle: input handle for the trace.dat file
- * @state: The state to read up to or zero to read up to options.
- *
- * This reads the trace.dat file for various information. Like the
- * format of the ring buffer, event formats, ftrace formats, kallsyms
- * and printk. This may be called multiple times with different @state
- * values, to read partial data at a time. It will always continue
- * where it left off.
- */
-int tracecmd_read_headers(struct tracecmd_input *handle,
- enum tracecmd_file_states state)
+static int read_headers_v6(struct tracecmd_input *handle, enum tracecmd_file_states state)
{
int ret;
@@ -1039,6 +1028,139 @@ int tracecmd_read_headers(struct tracecmd_input *handle,
return 0;
}
+static int handle_options(struct tracecmd_input *handle);
+
+static int read_section_header(struct tracecmd_input *handle, unsigned short *id,
+ unsigned short *flags, unsigned int *size, char **description)
+{
+ unsigned short fl;
+ char *desc = NULL;
+ unsigned short sec_id;
+ unsigned int sz;
+
+ if (read2(handle, &sec_id))
+ return -1;
+ desc = read_string(handle);
+ if (!desc)
+ return -1;
+ if (read2(handle, &fl))
+ goto error;
+ if (read4(handle, &sz))
+ goto error;
+
+ if (id)
+ *id = sec_id;
+ if (flags)
+ *flags = fl;
+ if (size)
+ *size = sz;
+ if (description)
+ *description = desc;
+ else
+ free(desc);
+ return 0;
+
+error:
+ free(desc);
+ return -1;
+}
+
+static int handle_section(struct tracecmd_input *handle, struct file_section *section)
+{
+ unsigned short id, flags;
+ unsigned int size;
+ int ret;
+
+ if (lseek64(handle->fd, section->section_offset, SEEK_SET) == (off_t)-1)
+ return -1;
+ if (read_section_header(handle, &id, &flags, &size, NULL))
+ return -1;
+ section->flags = flags;
+ if (id != section->id)
+ return -1;
+
+ section->data_offset = lseek64(handle->fd, 0, SEEK_CUR);
+ if ((section->flags & TRACECMD_SEC_FL_COMPRESS) && in_uncompress_block(handle))
+ return -1;
+
+ switch (section->id) {
+ case TRACECMD_OPTION_HEADER_INFO:
+ ret = read_header_files(handle);
+ break;
+ case TRACECMD_OPTION_FTRACE_EVENTS:
+ ret = read_ftrace_files(handle, NULL);
+ break;
+ case TRACECMD_OPTION_EVENT_FORMATS:
+ ret = read_event_files(handle, NULL);
+ break;
+ case TRACECMD_OPTION_KALLSYMS:
+ ret = read_proc_kallsyms(handle);
+ break;
+ case TRACECMD_OPTION_PRINTK:
+ ret = read_ftrace_printk(handle);
+ break;
+ case TRACECMD_OPTION_CMDLINES:
+ ret = read_and_parse_cmdlines(handle);
+ break;
+ default:
+ ret = 0;
+ break;
+ }
+
+ if (section->flags & TRACECMD_SEC_FL_COMPRESS)
+ in_uncompress_reset(handle);
+
+ return ret;
+}
+
+static int read_headers_v7(struct tracecmd_input *handle)
+{
+ struct file_section *section;
+
+ if (handle->options_init)
+ return 0;
+
+ if (!handle->options_start)
+ return -1;
+
+ if (lseek64(handle->fd, handle->options_start, SEEK_SET) == (off64_t)-1) {
+ tracecmd_warning("Filed to goto options offset %lld", handle->options_start);
+ return -1;
+ }
+
+ if (handle_options(handle))
+ return -1;
+
+ section = handle->sections;
+ while (section) {
+ if (handle_section(handle, section))
+ return -1;
+ section = section->next;
+ }
+
+ handle->options_init = true;
+ return 0;
+}
+
+/**
+ * tracecmd_read_headers - read the header information from trace.dat
+ * @handle: input handle for the trace.dat file
+ * @state: The state to read up to or zero to read up to options.
+ *
+ * This reads the trace.dat file for various information. Like the
+ * format of the ring buffer, event formats, ftrace formats, kallsyms
+ * and printk. This may be called multiple times with different @state
+ * values, to read partial data at a time. It will always continue
+ * where it left off.
+ */
+int tracecmd_read_headers(struct tracecmd_input *handle,
+ enum tracecmd_file_states state)
+{
+ if (handle->file_version < 7)
+ return read_headers_v6(handle, state);
+ return read_headers_v7(handle);
+}
+
static unsigned long long calc_page_offset(struct tracecmd_input *handle,
unsigned long long offset)
{
--
2.31.1
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