/*
* Blktrace record utility - Convert binary trace data into bunches of IOs
*
* Copyright (C) 2007 Alan D. Brunelle <Alan.Brunelle@hp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
static char build_date[] = __DATE__ " at "__TIME__;
#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <stdarg.h>
#if !defined(_GNU_SOURCE)
# define _GNU_SOURCE
#endif
#include <getopt.h>
#include "list.h"
#include "btrecord.h"
#include "blktrace.h"
/*
* Per input file information
*
* @head: Used to link up on input_files
* @devnm: Device name portion of this input file
* @file_name: Fully qualified name for this input file
* @cpu: CPU that this file was collected on
* @ifd: Input file descriptor (when opened)
* @tpkts: Total number of packets processed.
*/
struct ifile_info {
struct list_head head;
char *devnm, *file_name;
int cpu, ifd;
__u64 tpkts, genesis;
};
/*
* Per IO trace information
*
* @time: Time stamp when trace was emitted
* @sector: IO sector identifier
* @bytes: Number of bytes transferred
* @rw: Read (1) or write (0)
*/
struct io_spec {
__u64 time;
__u64 sector;
__u32 bytes;
int rw;
};
/*
* Per output file information
*
* @ofp: Output file
* @vfp: Verbose output file
* @file_name: Fully qualified name for this file
* @vfn: Fully qualified name for this file
* @cur: Current IO bunch being collected
* @iip: Input file this is associated with
* @start_time: Start time of th ecurrent bunch
* @last_time: Time of last packet put in
* @bunches: Number of bunches processed
* @pkts: Number of packets stored in bunches
*/
struct io_stream {
FILE *ofp, *vfp;
char *file_name, *vfn;
struct io_bunch *cur;
struct ifile_info *iip;
__u64 start_time, last_time, bunches, pkts;
};
int data_is_native; // Indicates whether to swap
static LIST_HEAD(input_files); // List of all input files
static char *idir = "."; // Input directory base
static char *odir = "."; // Output directory base
static char *obase = "replay"; // Output file base
static __u64 max_bunch_tm = (10 * 1000 * 1000); // 10 milliseconds
static __u64 max_pkts_per_bunch = 8; // Default # of pkts per bunch
static int verbose = 0; // Boolean: output stats
static int find_traces = 0; // Boolean: Find traces in dir
static char usage_str[] = \
"\n" \
"\t[ -d <dir> : --input-directory=<dir> ] Default: .\n" \
"\t[ -D <dir> : --output-directory=<dir>] Default: .\n" \
"\t[ -F : --find-traces ] Default: Off\n" \
"\t[ -h : --help ] Default: Off\n" \
"\t[ -m <nsec> : --max-bunch-time=<nsec> ] Default: 10 msec\n" \
"\t[ -M <pkts> : --max-pkts=<pkts> ] Default: 8\n" \
"\t[ -o <base> : --output-base=<base> ] Default: replay\n" \
"\t[ -v : --verbose ] Default: Off\n" \
"\t[ -V : --version ] Default: Off\n" \
"\t<dev>... Default: None\n" \
"\n";
#define S_OPTS "d:D:Fhm:M:o:vV"
static struct option l_opts[] = {
{
.name = "input-directory",
.has_arg = required_argument,
.flag = NULL,
.val = 'd'
},
{
.name = "output-directory",
.has_arg = required_argument,
.flag = NULL,
.val = 'D'
},
{
.name = "find-traces",
.has_arg = no_argument,
.flag = NULL,
.val = 'F'
},
{
.name = "help",
.has_arg = no_argument,
.flag = NULL,
.val = 'h'
},
{
.name = "max-bunch-time",
.has_arg = required_argument,
.flag = NULL,
.val = 'm'
},
{
.name = "max-pkts",
.has_arg = required_argument,
.flag = NULL,
.val = 'M'
},
{
.name = "output-base",
.has_arg = required_argument,
.flag = NULL,
.val = 'o'
},
{
.name = "verbose",
.has_arg = no_argument,
.flag = NULL,
.val = 'v'
},
{
.name = "version",
.has_arg = no_argument,
.flag = NULL,
.val = 'V'
},
{
.name = NULL
}
};
#define ERR_ARGS 1
#define ERR_SYSCALL 2
static inline void fatal(const char *errstring, const int exitval,
const char *fmt, ...)
{
va_list ap;
if (errstring)
perror(errstring);
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
exit(exitval);
/*NOTREACHED*/
}
/**
* match - Return true if this trace is a proper QUEUE transaction
* @action: Action field from trace
*/
static inline int match(__u32 action)
{
return ((action & 0xffff) == __BLK_TA_QUEUE) &&
(action & BLK_TC_ACT(BLK_TC_QUEUE));
}
/**
* usage - Display usage string and version
*/
static void usage(void)
{
fprintf(stderr, "Usage: btrecord -- version %s\n%s",
my_btversion, usage_str);
}
/**
* write_file_hdr - Seek to and write btrecord file header
* @stream: Output file information
* @hdr: Header to write
*/
static void write_file_hdr(struct io_stream *stream, struct io_file_hdr *hdr)
{
hdr->version = mk_btversion(btver_mjr, btver_mnr, btver_sub);
if (verbose) {
fprintf(stderr, "\t%s: %llx %llx %llx %llx\n",
stream->file_name,
(long long unsigned)hdr->version,
(long long unsigned)hdr->genesis,
(long long unsigned)hdr->nbunches,
(long long unsigned)hdr->total_pkts);
}
fseek(stream->ofp, 0, SEEK_SET);
if (fwrite(hdr, sizeof(*hdr), 1, stream->ofp) != 1) {
fatal(stream->file_name, ERR_SYSCALL, "Hdr write failed\n");
/*NOTREACHED*/
}
}
/**
* io_bunch_create - Allocate & initialize an io_bunch
* @io_stream: IO stream being added to
* @pre_stall: Amount of time that this bunch should be delayed by
* @start_time: Records current start
*/
static inline void io_bunch_create(struct io_stream *stream, __u64 start_time)
{
struct io_bunch *cur = malloc(sizeof(*cur));
memset(cur, 0, sizeof(*cur));
cur->hdr.npkts = 0;
cur->hdr.time_stamp = stream->start_time = start_time;
stream->cur = cur;
}
/**
* io_bunch_add - Add an IO to the current bunch of IOs
* @stream: Per-output file stream information
* @spec: IO trace specification
*
* Returns update bunch information
*/
static void io_bunch_add(struct io_stream *stream, struct io_spec *spec)
{
struct io_bunch *cur = stream->cur;
struct io_pkt iop = {
.sector = spec->sector,
.nbytes = spec->bytes,
.rw = spec->rw
};
assert(cur != NULL);
assert(cur->hdr.npkts < BT_MAX_PKTS);
assert(stream->last_time == 0 || stream->last_time <= spec->time);
cur->pkts[cur->hdr.npkts++] = iop; // Struct copy
stream->last_time = spec->time;
}
/**
* rem_input_file - Release resources associated with an input file
* @iip: Per-input file information
*/
static void rem_input_file(struct ifile_info *iip)
{
list_del(&iip->head);
close(iip->ifd);
free(iip->file_name);
free(iip->devnm);
free(iip);
}
/**
* __add_input_file - Allocate and initialize per-input file structure
* @cpu: CPU for this file
* @devnm: Device name for this file
* @file_name: Fully qualifed input file name
*/
static void __add_input_file(int cpu, char *devnm, char *file_name)
{
struct ifile_info *iip = malloc(sizeof(*iip));
iip->cpu = cpu;
iip->tpkts = 0;
iip->genesis = 0;
iip->devnm = strdup(devnm);
iip->file_name = strdup(file_name);
iip->ifd = open(file_name, O_RDONLY);
if (iip->ifd < 0) {
fatal(file_name, ERR_ARGS, "Unable to open\n");
/*NOTREACHED*/
}
list_add_tail(&iip->head, &input_files);
}
/**
* add_input_file - Set up the input file name
* @devnm: Device name to use
*/
static void add_input_file(char *devnm)
{
struct list_head *p;
int cpu, found = 0;
__list_for_each(p, &input_files) {
struct ifile_info *iip = list_entry(p, struct ifile_info, head);
if (strcmp(iip->devnm, devnm) == 0)
return;
}
for (cpu = 0; ; cpu++) {
char full_name[MAXPATHLEN];
sprintf(full_name, "%s/%s.blktrace.%d", idir, devnm, cpu);
if (access(full_name, R_OK) != 0)
break;
__add_input_file(cpu, devnm, full_name);
found++;
}
if (!found) {
fatal(NULL, ERR_ARGS, "No traces found for %s\n", devnm);
/*NOTREACHED*/
}
}
static void find_input_files(char *idir)
{
struct dirent *ent;
DIR *dir = opendir(idir);
if (dir == NULL) {
fatal(idir, ERR_ARGS, "Unable to open %s\n", idir);
/*NOTREACHED*/
}
while ((ent = readdir(dir)) != NULL) {
char *p, *dsf = malloc(256);
if (strstr(ent->d_name, ".blktrace.") == NULL)
continue;
dsf = strdup(ent->d_name);
p = index(dsf, '.');
assert(p != NULL);
*p = '\0';
add_input_file(dsf);
free(dsf);
}
closedir(dir);
}
/**
* handle_args - Parse passed in argument list
* @argc: Number of arguments in argv
* @argv: Arguments passed in
*
* Does rudimentary parameter verification as well.
*/
void handle_args(int argc, char *argv[])
{
int c;
while ((c = getopt_long(argc, argv, S_OPTS, l_opts, NULL)) != -1) {
switch (c) {
case 'd':
idir = optarg;
if (access(idir, R_OK | X_OK) != 0) {
fatal(idir, ERR_ARGS,
"Invalid input directory specified\n");
/*NOTREACHED*/
}
break;
case 'D':
odir = optarg;
if (access(odir, R_OK | X_OK) != 0) {
fatal(odir, ERR_ARGS,
"Invalid output directory specified\n");
/*NOTREACHED*/
}
break;
case 'F':
find_traces = 1;
break;
case 'h':
usage();
exit(0);
/*NOTREACHED*/
case 'm':
max_bunch_tm = (__u64)atoll(optarg);
if (max_bunch_tm < 1) {
fprintf(stderr, "Invalid bunch time %llu\n",
(unsigned long long)max_bunch_tm);
exit(ERR_ARGS);
/*NOTREACHED*/
}
break;
case 'M':
max_pkts_per_bunch = (__u64)atoll(optarg);
if (!((1 <= max_pkts_per_bunch) &&
(max_pkts_per_bunch < 513))) {
fprintf(stderr, "Invalid max pkts %llu\n",
(unsigned long long)max_pkts_per_bunch);
exit(ERR_ARGS);
/*NOTREACHED*/
}
break;
case 'o':
obase = optarg;
break;
case 'V':
fprintf(stderr, "btrecord -- version %s\n",
my_btversion);
fprintf(stderr, " Built on %s\n", build_date);
exit(0);
/*NOTREACHED*/
case 'v':
verbose++;
break;
default:
usage();
fatal(NULL, ERR_ARGS, "Invalid command line\n");
/*NOTREACHED*/
}
}
while (optind < argc)
add_input_file(argv[optind++]);
if (find_traces)
find_input_files(idir);
if (list_len(&input_files) == 0) {
fatal(NULL, ERR_ARGS, "Missing required input file name(s)\n");
/*NOTREACHED*/
}
}
/**
* next_io - Retrieve next Q trace from input stream
* @iip: Per-input file information
* @spec: IO specifier for trace
*
* Returns 0 on end of file, 1 if valid data returned.
*/
static int next_io(struct ifile_info *iip, struct io_spec *spec)
{
ssize_t ret;
__u32 action;
__u16 pdu_len;
struct blk_io_trace t;
again:
ret = read(iip->ifd, &t, sizeof(t));
if (ret < 0) {
fatal(iip->file_name, ERR_SYSCALL, "Read failed\n");
/*NOTREACHED*/
}
else if (ret == 0)
return 0;
else if (ret < (ssize_t)sizeof(t)) {
fprintf(stderr, "WARNING: Short read on %s (%d)\n",
iip->file_name, (int)ret);
return 0;
}
if (data_is_native == -1)
check_data_endianness(t.magic);
assert(data_is_native >= 0);
if (data_is_native) {
spec->time = t.time;
spec->sector = t.sector;
spec->bytes = t.bytes;
action = t.action;
pdu_len = t.pdu_len;
}
else {
spec->time = be64_to_cpu(t.time);
spec->sector = be64_to_cpu(t.sector);
spec->bytes = be32_to_cpu(t.bytes);
action = be32_to_cpu(t.action);
pdu_len = be16_to_cpu(t.pdu_len);
}
if (pdu_len) {
char buf[pdu_len];
ret = read(iip->ifd, buf, pdu_len);
if (ret < 0) {
fatal(iip->file_name, ERR_SYSCALL, "Read PDU failed\n");
/*NOTREACHED*/
}
else if (ret < (ssize_t)pdu_len) {
fprintf(stderr, "WARNING: Short PDU read on %s (%d)\n",
iip->file_name, (int)ret);
return 0;
}
}
iip->tpkts++;
if (!match(action))
goto again;
spec->rw = (action & BLK_TC_ACT(BLK_TC_READ)) ? 1 : 0;
if (verbose > 1)
fprintf(stderr, "%2d: %10llu+%10llu (%d) @ %10llx\n",
iip->cpu, (long long unsigned)spec->sector,
(long long unsigned)spec->bytes / 512LLU,
spec->rw, (long long unsigned)spec->time);
if (iip->genesis == 0) {
iip->genesis = spec->time;
if (verbose > 1)
fprintf(stderr, "\tSetting new genesis: %llx(%d)\n",
(long long unsigned)iip->genesis, iip->cpu);
}
else if (iip->genesis > spec->time)
fatal(NULL, ERR_SYSCALL,
"Time inversion? %llu ... %llu\n",
(long long unsigned )iip->genesis,
(long long unsigned )spec->time);
return 1;
}
/**
* bunch_output_hdr - Output bunch header
*/
static inline void bunch_output_hdr(struct io_stream *stream)
{
struct io_bunch_hdr *hdrp = &stream->cur->hdr;
assert(0 < hdrp->npkts && hdrp->npkts <= BT_MAX_PKTS);
if (fwrite(hdrp, sizeof(struct io_bunch_hdr), 1, stream->ofp) != 1) {
fatal(stream->file_name, ERR_SYSCALL, "fwrite(hdr) failed\n");
/*NOTREACHED*/
}
if (verbose) {
__u64 off = hdrp->time_stamp - stream->iip->genesis;
assert(stream->vfp);
fprintf(stream->vfp, "------------------\n");
fprintf(stream->vfp, "%4llu.%09llu %3llu\n",
(unsigned long long)off / (1000 * 1000 * 1000),
(unsigned long long)off % (1000 * 1000 * 1000),
(unsigned long long)hdrp->npkts);
fprintf(stream->vfp, "------------------\n");
}
}
/**
* bunch_output_pkt - Output IO packets
*/
static inline void bunch_output_pkts(struct io_stream *stream)
{
struct io_pkt *p = stream->cur->pkts;
size_t npkts = stream->cur->hdr.npkts;
assert(0 < npkts && npkts <= BT_MAX_PKTS);
if (fwrite(p, sizeof(struct io_pkt), npkts, stream->ofp) != npkts) {
fatal(stream->file_name, ERR_SYSCALL, "fwrite(pkts) failed\n");
/*NOTREACHED*/
}
if (verbose) {
size_t i;
assert(stream->vfp);
for (i = 0; i < npkts; i++, p++)
fprintf(stream->vfp, "\t%1d %10llu\t%10llu\n",
p->rw,
(unsigned long long)p->sector,
(unsigned long long)p->nbytes / 512);
}
}
/**
* stream_flush - Flush current bunch of IOs out to the output stream
* @stream: Per-output file stream information
*/
static void stream_flush(struct io_stream *stream)
{
struct io_bunch *cur = stream->cur;
if (cur) {
if (cur->hdr.npkts) {
assert(cur->hdr.npkts <= BT_MAX_PKTS);
bunch_output_hdr(stream);
bunch_output_pkts(stream);
stream->bunches++;
stream->pkts += cur->hdr.npkts;
}
free(cur);
}
}
/**
* bunch_done - Returns true if current bunch is either full, or next IO is late
* @stream: Output stream information
* @spec: IO trace specification
*/
static inline int bunch_done(struct io_stream *stream, struct io_spec *spec)
{
if (stream->cur->hdr.npkts >= max_pkts_per_bunch)
return 1;
if ((spec->time - stream->start_time) > max_bunch_tm)
return 1;
return 0;
}
/**
* stream_add_io - Add an IO trace to the current stream
* @stream: Output stream information
* @spec: IO trace specification
*/
static void stream_add_io(struct io_stream *stream, struct io_spec *spec)
{
if (stream->cur == NULL)
io_bunch_create(stream, spec->time);
else if (bunch_done(stream, spec)) {
stream_flush(stream);
io_bunch_create(stream, spec->time);
}
io_bunch_add(stream, spec);
}
/**
* stream_open - Open output stream for specified input stream
* @iip: Per-input file information
*/
static struct io_stream *stream_open(struct ifile_info *iip)
{
char ofile_name[MAXPATHLEN];
struct io_stream *stream = malloc(sizeof(*stream));
struct io_file_hdr io_file_hdr = {
.genesis = 0,
.nbunches = 0,
.total_pkts = 0
};
memset(stream, 0, sizeof(*stream));
sprintf(ofile_name, "%s/%s.%s.%d", odir, iip->devnm, obase, iip->cpu);
stream->ofp = fopen(ofile_name, "w");
if (!stream->ofp) {
fatal(ofile_name, ERR_SYSCALL, "Open failed\n");
/*NOTREACHED*/
}
stream->iip = iip;
stream->cur = NULL;
stream->bunches = stream->pkts = 0;
stream->last_time = 0;
stream->file_name = strdup(ofile_name);
write_file_hdr(stream, &io_file_hdr);
if (verbose) {
char vfile_name[MAXPATHLEN];
sprintf(vfile_name, "%s/%s.%s.%d.rec", odir, iip->devnm,
obase, iip->cpu);
stream->vfp = fopen(vfile_name, "w");
if (!stream->vfp) {
fatal(vfile_name, ERR_SYSCALL, "Open failed\n");
/*NOTREACHED*/
}
stream->vfn = strdup(vfile_name);
}
data_is_native = -1;
return stream;
}
/**
* stream_close - Release resources associated with an output stream
* @stream: Stream to release
*/
static void stream_close(struct io_stream *stream)
{
struct io_file_hdr io_file_hdr = {
.genesis = stream->iip->genesis,
.nbunches = stream->bunches,
.total_pkts = stream->pkts
};
stream_flush(stream);
write_file_hdr(stream, &io_file_hdr);
fclose(stream->ofp);
if (verbose && stream->bunches) {
fprintf(stderr,
"%s:%d: %llu pkts (tot), %llu pkts (replay), "
"%llu bunches, %.1lf pkts/bunch\n",
stream->iip->devnm, stream->iip->cpu,
(unsigned long long)stream->iip->tpkts,
(unsigned long long)stream->pkts,
(unsigned long long)stream->bunches,
(double)(stream->pkts) / (double)(stream->bunches));
fclose(stream->vfp);
free(stream->vfn);
}
free(stream->file_name);
free(stream);
}
/**
* process - Process one input file to an output file
* @iip: Per-input file information
*/
static void process(struct ifile_info *iip)
{
struct io_spec spec;
struct io_stream *stream;
stream = stream_open(iip);
while (next_io(iip, &spec))
stream_add_io(stream, &spec);
stream_close(stream);
rem_input_file(iip);
}
/**
* main -
* @argc: Number of arguments
* @argv: Array of arguments
*/
int main(int argc, char *argv[])
{
struct list_head *p, *q;
handle_args(argc, argv);
list_for_each_safe(p, q, &input_files)
process(list_entry(p, struct ifile_info, head));
return 0;
}