Fix replay of IO pattern with multiple open files

Nikolaus writes:

I've tried to replay I/Os from a textual iolog file to a couple of files
using fio 2.0.13 on Linux. However, all I/Os were performed to the last
opened file, which is '/mnt/ssd5/rand-write.1.0_1_2' in this example .
My jobfile and iolog files contain the following:

[global]
name=replay_filetraces
description=Replay file traces
ioengine=libaio
iodepth=6
direct=1
continue_on_error=1

[replay]
numjobs=1
read_iolog=file_io_patterns
unlink=0

fio version 2 iolog
/mnt/ssd0/rand-write.1.0_0_0 add
/mnt/ssd1/rand-write.1.0_0_1 add
/mnt/ssd2/rand-write.1.0_0_2 add
/mnt/ssd3/rand-write.1.0_1_0 add
/mnt/ssd4/rand-write.1.0_1_1 add
/mnt/ssd5/rand-write.1.0_1_2 add
/mnt/ssd0/rand-write.1.0_0_0 open
/mnt/ssd1/rand-write.1.0_0_1 open
/mnt/ssd2/rand-write.1.0_0_2 open
/mnt/ssd3/rand-write.1.0_1_0 open
/mnt/ssd4/rand-write.1.0_1_1 open
/mnt/ssd5/rand-write.1.0_1_2 open
/mnt/ssd0/rand-write.1.0_0_0 write 0 65536
/mnt/ssd1/rand-write.1.0_0_1 write 0 65536
/mnt/ssd2/rand-write.1.0_0_2 write 0 65536
/mnt/ssd3/rand-write.1.0_1_0 write 0 65536
/mnt/ssd4/rand-write.1.0_1_1 write 0 65536
/mnt/ssd5/rand-write.1.0_1_2 write 0 65536
/mnt/ssd0/rand-write.1.0_0_0 write 65536 65536
/mnt/ssd1/rand-write.1.0_0_1 write 65536 65536
/mnt/ssd2/rand-write.1.0_0_2 write 65536 65536
/mnt/ssd3/rand-write.1.0_1_0 write 65536 65536
/mnt/ssd4/rand-write.1.0_1_1 write 65536 65536
/mnt/ssd5/rand-write.1.0_1_2 write 65536 65536
/mnt/ssd0/rand-write.1.0_0_0 close
/mnt/ssd1/rand-write.1.0_0_1 close
/mnt/ssd2/rand-write.1.0_0_2 close
/mnt/ssd3/rand-write.1.0_1_0 close
/mnt/ssd4/rand-write.1.0_1_1 close
/mnt/ssd5/rand-write.1.0_1_2 close

I've turned on debugging and added some extra printf in read_iolog2()
within iolog.c.

file     24594 add file /mnt/ssd0/rand-write.1.0_0_0
file     24594 resize file array to 2 files
file     24594 file 0x7fbe03f53090 "/mnt/ssd0/rand-write.1.0_0_0" added at 0
file     24594 add file /mnt/ssd1/rand-write.1.0_0_1
file     24594 file 0x7fbe03f53230 "/mnt/ssd1/rand-write.1.0_0_1" added at 1
file     24594 add file /mnt/ssd2/rand-write.1.0_0_2
file     24594 resize file array to 4 files
file     24594 file 0x7fbe03f533d0 "/mnt/ssd2/rand-write.1.0_0_2" added at 2
file     24594 add file /mnt/ssd3/rand-write.1.0_1_0
file     24594 file 0x7fbe03f53570 "/mnt/ssd3/rand-write.1.0_1_0" added at 3
file     24594 add file /mnt/ssd4/rand-write.1.0_1_1
file     24594 resize file array to 6 files
file     24594 file 0x7fbe03f53710 "/mnt/ssd4/rand-write.1.0_1_1" added at 4
file     24594 add file /mnt/ssd5/rand-write.1.0_1_2
file     24594 file 0x7fbe03f538b0 "/mnt/ssd5/rand-write.1.0_1_2" added at 5
io       24594 read_iolog2: Making note of file.
offset=7310584035475809390 bytes=811544671 fileno=0 file_action=1
fname=/mnt/ssd0/rand-write.1.0_0_0 act=open
io       24594 read_iolog2: Making note of file.
offset=7310584035475809390 bytes=811544671 fileno=1 file_action=1
fname=/mnt/ssd1/rand-write.1.0_0_1 act=open
io       24594 read_iolog2: Making note of file.
offset=7310584035475809390 bytes=811544671 fileno=2 file_action=1
fname=/mnt/ssd2/rand-write.1.0_0_2 act=open
io       24594 read_iolog2: Making note of file.
offset=7310584035475809390 bytes=811544671 fileno=3 file_action=1
fname=/mnt/ssd3/rand-write.1.0_1_0 act=open
io       24594 read_iolog2: Making note of file.
offset=7310584035475809390 bytes=811544671 fileno=4 file_action=1
fname=/mnt/ssd4/rand-write.1.0_1_1 act=open
io       24594 read_iolog2: Making note of file.
offset=7310584035475809390 bytes=811544671 fileno=5 file_action=1
fname=/mnt/ssd5/rand-write.1.0_1_2 act=open
io       24594 read_iolog2: Making note of file. offset=0 bytes=65536
fileno=5 file_action=1 fname=/mnt/ssd0/rand-write.1.0_0_0 act=write
io       24594 read_iolog2: Making note of file. offset=0 bytes=65536
fileno=5 file_action=1 fname=/mnt/ssd1/rand-write.1.0_0_1 act=write
io       24594 read_iolog2: Making note of file. offset=0 bytes=65536
fileno=5 file_action=1 fname=/mnt/ssd2/rand-write.1.0_0_2 act=write
io       24594 read_iolog2: Making note of file. offset=0 bytes=65536
fileno=5 file_action=1 fname=/mnt/ssd3/rand-write.1.0_1_0 act=write
io       24594 read_iolog2: Making note of file. offset=0 bytes=65536
fileno=5 file_action=1 fname=/mnt/ssd4/rand-write.1.0_1_1 act=write
io       24594 read_iolog2: Making note of file. offset=0 bytes=65536
fileno=5 file_action=1 fname=/mnt/ssd5/rand-write.1.0_1_2 act=write
io       24594 read_iolog2: Making note of file. offset=65536
bytes=65536 fileno=5 file_action=1 fname=/mnt/ssd0/rand-write.1.0_0_0
act=write
io       24594 read_iolog2: Making note of file. offset=65536
bytes=65536 fileno=5 file_action=1 fname=/mnt/ssd1/rand-write.1.0_0_1
act=write
io       24594 read_iolog2: Making note of file. offset=65536
bytes=65536 fileno=5 file_action=1 fname=/mnt/ssd2/rand-write.1.0_0_2
act=write
io       24594 read_iolog2: Making note of file. offset=65536
bytes=65536 fileno=5 file_action=1 fname=/mnt/ssd3/rand-write.1.0_1_0
act=write
io       24594 read_iolog2: Making note of file. offset=65536
bytes=65536 fileno=5 file_action=1 fname=/mnt/ssd4/rand-write.1.0_1_1
act=write
io       24594 read_iolog2: Making note of file. offset=65536
bytes=65536 fileno=5 file_action=1 fname=/mnt/ssd5/rand-write.1.0_1_2
act=write
io       24594 read_iolog2: Making note of file. offset=65536
bytes=65536 fileno=0 file_action=2 fname=/mnt/ssd0/rand-write.1.0_0_0
act=close
io       24594 read_iolog2: Making note of file. offset=65536
bytes=65536 fileno=1 file_action=2 fname=/mnt/ssd1/rand-write.1.0_0_1
act=close
io       24594 read_iolog2: Making note of file. offset=65536
bytes=65536 fileno=2 file_action=2 fname=/mnt/ssd2/rand-write.1.0_0_2
act=close
io       24594 read_iolog2: Making note of file. offset=65536
bytes=65536 fileno=3 file_action=2 fname=/mnt/ssd3/rand-write.1.0_1_0
act=close
io       24594 read_iolog2: Making note of file. offset=65536
bytes=65536 fileno=4 file_action=2 fname=/mnt/ssd4/rand-write.1.0_1_1
act=close
io       24594 read_iolog2: Making note of file. offset=65536
bytes=65536 fileno=5 file_action=2 fname=/mnt/ssd5/rand-write.1.0_1_2
act=close

Taking a look to the debugging output shows that on write action the
'fileno' variable is always set to 5 regardless of the file that should
be written. However, for open and close we have a different fileno value
for each file. Taking a look into the source code of read_iolog2()
reveals why: In case of actions 'open' or 'close', 'fileno' is looked up
through 'get_fileno(td, fname)', but for 'write', 'read' and the other 4
argument actions 'fileno' is not looked up. When I add a 'fileno =
get_fileno(td, fname);' at the end of the '(r == 4)' branch, I/Os are
replayed to the designated files.

                 if (r == 4) {
                         /*
                          * Check action first
                          */
                         if (!strcmp(act, "wait"))
                                 rw = DDIR_WAIT;
                         else if (!strcmp(act, "read"))
                                 rw = DDIR_READ;
                         else if (!strcmp(act, "write"))
                                 rw = DDIR_WRITE;
                         else if (!strcmp(act, "sync"))
                                 rw = DDIR_SYNC;
                         else if (!strcmp(act, "datasync"))
                                 rw = DDIR_DATASYNC;
                         else if (!strcmp(act, "trim"))
                                 rw = DDIR_TRIM;
                         else {
                                 log_err("fio: bad iolog file action: %s\n",
act);
                                 continue;
                         }
                 } else if (r == 2) {
                         rw = DDIR_INVAL;
                         if (!strcmp(act, "add")) {
                                 td->o.nr_files++;
                                 fileno = add_file(td, fname);
                                 file_action = FIO_LOG_ADD_FILE;
                                 continue;
                         } else if (!strcmp(act, "open")) {
                                 fileno = get_fileno(td, fname);
                                 file_action = FIO_LOG_OPEN_FILE;
                         } else if (!strcmp(act, "close")) {
                                 fileno = get_fileno(td, fname);
                                 file_action = FIO_LOG_CLOSE_FILE;
                         } else {
                                 log_err("fio: bad iolog file action: %s\n",
act);
                                 continue;
                         }
                 } else {
                         log_err("bad iolog2: %s", p);
                         continue;
                 }

Signed-off-by: Jens Axboe <axboe@kernel.dk>