[PATCH v2 65/87] trace-cmd dump: Read recursively all options sections

["Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>]

Trace file version 7 supports multiple options sections in the file. The
DONE option is extended to hold the offset to the next options section.
A new logic for handling the extended DONE option and to read recursively
all options sections is added.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 tracecmd/trace-dump.c | 76 ++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 68 insertions(+), 8 deletions(-)

diff --git a/tracecmd/trace-dump.c b/tracecmd/trace-dump.c
index 010a8188..f801e0b6 100644
--- a/tracecmd/trace-dump.c
+++ b/tracecmd/trace-dump.c
@@ -422,6 +422,30 @@ static void dump_option_string(int fd, int size, char *desc)
 		read_dump_string(fd, size, OPTIONS);
 }
 
+static void dump_section_header(int fd, enum dump_items v, unsigned short *flags)
+{
+	unsigned long long offset;
+	unsigned short fl;
+	char buf[DUMP_SIZE];
+	unsigned short id;
+	int size;
+
+	offset = lseek64(fd, 0, SEEK_CUR);
+	if (read_file_number(fd, &id, 2))
+		die("cannot read the section id");
+	if (read_file_string(fd, buf, DUMP_SIZE))
+		die("no section description");
+	if (read_file_number(fd, &fl, 2))
+		die("cannot read the section flags");
+	if (read_file_number(fd, &size, 4))
+		die("cannot read section size");
+	do_print(v, "\t[Section %d @ %lld: \"%s\", flags 0x%X, %d bytes]\n",
+		 id, offset, buf, fl, size);
+
+	if (flags)
+		*flags = fl;
+}
+
 static void dump_option_buffer(int fd, int size)
 {
 	unsigned long long offset;
@@ -591,25 +615,48 @@ void dump_option_tsc2nsec(int fd, int size)
 	do_print(OPTIONS, "%d %d %llu [multiplier, shift, offset]\n", mult, shift, offset);
 }
 
-static void dump_options(int fd)
+static int dump_options_read(int fd);
+
+static int dump_option_done(int fd, int size)
 {
+	unsigned long long offset;
+
+	do_print(OPTIONS, "\t\t[Option DONE, %d bytes]\n", size);
+
+	if (file_version < 7 || size < 8)
+		return 0;
+	if (read_file_number(fd, &offset, 8))
+		die("cannot read the next options offset");
+	do_print(OPTIONS, "%lld\n", offset);
+	if (!offset)
+		return 0;
+
+	if (lseek64(fd, offset, SEEK_SET) == (off_t)-1)
+		die("cannot goto next options offset %lld", offset);
+	return dump_options_read(fd);
+}
+
+static int dump_options_read(int fd)
+{
+	unsigned short flags = 0;
 	unsigned short option;
 	unsigned int size;
 	int count = 0;
 
+	if (file_version >= 7)
+		dump_section_header(fd, OPTIONS, &flags);
+	if ((flags & TRACECMD_SEC_FL_COMPRESS) && uncompress_block())
+		die("cannot uncompress file block");
+
 	for (;;) {
 		if (read_file_number(fd, &option, 2))
 			die("cannot read the option id");
-		if (!option)
+		if (option == TRACECMD_OPTION_DONE && file_version < 7)
 			break;
 		if (read_file_number(fd, &size, 4))
 			die("cannot read the option size");
 
 		count++;
-		if (!DUMP_CHECK(OPTIONS) && !DUMP_CHECK(CLOCK) && !DUMP_CHECK(SUMMARY)) {
-			lseek64(fd, size, SEEK_CUR);
-			continue;
-		}
 		switch (option) {
 		case TRACECMD_OPTION_DATE:
 			dump_option_string(fd, size, "DATE");
@@ -621,7 +668,8 @@ static void dump_options(int fd)
 			dump_option_buffer(fd, size);
 			break;
 		case TRACECMD_OPTION_TRACECLOCK:
-			dump_option_string(fd, size, "TRACECLOCK");
+			do_print(OPTIONS, "\t\t[Option TRACECLOCK, %d bytes]\n", size);
+			read_dump_string(fd, size, OPTIONS | CLOCK);
 			has_clock = 1;
 			break;
 		case TRACECMD_OPTION_UNAME:
@@ -654,6 +702,10 @@ static void dump_options(int fd)
 		case TRACECMD_OPTION_TSC2NSEC:
 			dump_option_tsc2nsec(fd, size);
 			break;
+		case TRACECMD_OPTION_DONE:
+			uncompress_reset();
+			count += dump_option_done(fd, size);
+			return count;
 		default:
 			do_print(OPTIONS, " %d %d\t[Unknown option, size - skipping]\n",
 				 option, size);
@@ -661,8 +713,16 @@ static void dump_options(int fd)
 			break;
 		}
 	}
-	do_print(SUMMARY, "\t[%d options]\n", count);
+	uncompress_reset();
+	return count;
+}
+
+static void dump_options(int fd)
+{
+	int count;
 
+	count = dump_options_read(fd);
+	do_print(SUMMARY|OPTIONS, "\t[%d options]\n", count);
 }
 
 static void dump_latency(int fd)
-- 
2.31.1