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Add support for printing traces from files

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We can extract the formats and records from a crash dump and
print them from the files.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2016-05-28 12:41:30 -07:00
parent 54867b0f9c
commit d774e5308b
1 changed files with 80 additions and 18 deletions
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98
utils/src/trace.c
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@@ -13,7 +13,7 @@
#include "ioctl.h"
#include "cmd.h"
static int get_ibuf(int fd, int cmd, struct scoutfs_ioctl_buf *ibuf)
static int ibuf_ioctl(int fd, int cmd, struct scoutfs_ioctl_buf *ibuf)
{
int ret;
@@ -48,6 +48,59 @@ static int get_ibuf(int fd, int cmd, struct scoutfs_ioctl_buf *ibuf)
return ret;
}
static int ibuf_read(char *path, struct scoutfs_ioctl_buf *ibuf)
{
struct stat st;
ssize_t bytes;
int fd;
int ret;
if (stat(path, &st)) {
ret = -errno;
fprintf(stderr, "stat %s failed: %s (%d)\n",
path, strerror(errno), errno);
return ret;
}
if (!S_ISREG(st.st_mode)) {
fprintf(stderr, "%s must be a regular file\n", path);
return -EINVAL;
}
fd = open(path, O_RDONLY);
if (fd < 0) {
ret = -errno;
fprintf(stderr, "failed to open '%s': %s (%d)\n",
path, strerror(errno), errno);
return ret;
}
ibuf->len = st.st_size;
ibuf->ptr = (intptr_t)malloc(ibuf->len);
if (!ibuf->ptr) {
ret = -errno;
fprintf(stderr, "allocate %d bytes failed: %s (%d)\n",
ibuf->len, strerror(errno), errno);
return ret;
}
bytes = read(fd, (void *)(intptr_t)ibuf->ptr, ibuf->len);
if (bytes != ibuf->len) {
if (bytes < 0)
ret = -errno;
else
ret = -EIO;
fprintf(stderr, "read %d bytes from %s returned %zd: %s (%d)\n",
ibuf->len, path, bytes, strerror(errno), errno);
} else {
ret = 0;
}
close(fd);
return ret;
}
static int decode_u64_bytes(struct scoutfs_trace_record *rec, u64 *args)
{
u8 *data;
@@ -130,21 +183,27 @@ static int trace_cmd(int argc, char **argv)
int ret;
int fd;
fd = open(path, O_RDONLY);
if (fd < 0) {
ret = -errno;
fprintf(stderr, "failed to open '%s': %s (%d)\n",
path, strerror(errno), errno);
return ret;
}
if (argc == 0) {
fd = open(path, O_RDONLY);
if (fd < 0) {
ret = -errno;
fprintf(stderr, "failed to open '%s': %s (%d)\n",
path, strerror(errno), errno);
return ret;
}
/*
* Read the formats and records. Our fd on the debugfs file
* should prevent the module from unloading which is the only
* way the per-module formats could change.
*/
ret = get_ibuf(fd, SCOUTFS_IOC_GET_TRACE_FORMATS, &fmts) ?:
get_ibuf(fd, SCOUTFS_IOC_GET_TRACE_RECORDS, &recs);
/* fd on debugfs file pins formats that live in module */
ret = ibuf_ioctl(fd, SCOUTFS_IOC_GET_TRACE_FORMATS, &fmts) ?:
ibuf_ioctl(fd, SCOUTFS_IOC_GET_TRACE_RECORDS, &recs);
close(fd);
} else {
if (argc != 2) {
fprintf(stderr, "specify trace and record files\n");
return -EINVAL;
}
ret = ibuf_read(argv[0], &fmts) ?:
ibuf_read(argv[1], &recs);
}
if (ret)
goto out;
@@ -158,12 +217,15 @@ static int trace_cmd(int argc, char **argv)
}
out:
close(fd);
if (fmts.ptr)
free((void *)(intptr_t)fmts.ptr);
if (recs.ptr)
free((void *)(intptr_t)recs.ptr);
return ret;
};
static void __attribute__((constructor)) trace_ctor(void)
{
cmd_register("trace", "<device>", "print scoutfs kernel traces",
trace_cmd);
cmd_register("trace", "[fmt file] [record file]",
"print scoutfs kernel traces", trace_cmd);
}