sg: allow fio to open and close streams for WRITE STREAM(16) commands

sg: allow fio to open and close streams for WRITE STREAM(16) commands

If --stream_id=0 then fio will open a stream for WRITE STREAM(16) commands and
close the stream when the device file is closed.

Example:
./fio --name=test --filename=/dev/sdb --ioengine=sg --number_ios=1 --debug=file,io --sg_write_mode=write_stream --rw=randwrite
fio: set debug option file
fio: set debug option io
test: (g=0): rw=randwrite, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=sg, iodepth=1
fio-3.27
Starting 1 process
file     1072297 setup files
file     1072297 get file size for 0x7f0306fa5110/0//dev/sdb
file     1072307 trying file /dev/sdb 290
file     1072307 fd open /dev/sdb
file     1072307 file not found in hash /dev/sdb
file     1072307 sgio_stream_control: opened stream 1
file     1072307 get file /dev/sdb, ref=0
io       1072307 drop page cache /dev/sdb
file     1072307 goodf=1, badf=2, ff=2b1
file     1072307 get_next_file_rr: 0x7f0306fa5110
file     1072307 get_next_file: 0x7f0306fa5110 [/dev/sdb]
file     1072307 get file /dev/sdb, ref=1
io       1072307 fill: io_u 0xb55700: off=0x35ef554000,len=0x1000,ddir=1,file=/dev/sdb
io       1072307 prep: io_u 0xb55700: off=0x35ef554000,len=0x1000,ddir=1,file=/dev/sdb
io       1072307 prep: io_u 0xb55700: ret=0
io       1072307 queue: io_u 0xb55700: off=0x35ef554000,len=0x1000,ddir=1,file=/dev/sdb
io       1072307 complete: io_u 0xb55700: off=0x35ef554000,len=0x1000,ddir=1,file=/dev/sdb
file     1072307 put file /dev/sdb, ref=2
file     1072307 close files
file     1072307 put file /dev/sdb, ref=1
file     1072307 sgio_stream_control: closed stream 1
file     1072307 fd close /dev/sdb
io       1072307 close ioengine sg
io       1072307 free ioengine sg

test: (groupid=0, jobs=1): err= 0: pid=1072307: Mon Aug 16 14:25:45 2021
  write: IOPS=200, BW=800KiB/s (819kB/s)(4096B/5msec); 0 zone resets
    clat (nsec): min=93339, max=93339, avg=93339.00, stdev= 0.00
     lat (nsec): min=96201, max=96201, avg=96201.00, stdev= 0.00
    clat percentiles (nsec):
     |  1.00th=[93696],  5.00th=[93696], 10.00th=[93696], 20.00th=[93696],
     | 30.00th=[93696], 40.00th=[93696], 50.00th=[93696], 60.00th=[93696],
     | 70.00th=[93696], 80.00th=[93696], 90.00th=[93696], 95.00th=[93696],
     | 99.00th=[93696], 99.50th=[93696], 99.90th=[93696], 99.95th=[93696],
     | 99.99th=[93696]
  lat (usec)   : 100=100.00%
  cpu          : usr=100.00%, sys=0.00%, ctx=2, majf=0, minf=20
  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued rwts: total=0,1,0,0 short=0,0,0,0 dropped=0,0,0,0
     latency   : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):
  WRITE: bw=800KiB/s (819kB/s), 800KiB/s-800KiB/s (819kB/s-819kB/s), io=4096B (4096B), run=5-5msec

Signed-off-by: Vincent Fu <vincent.fu@samsung.com>
Link: https://lore.kernel.org/r/20211115200807.117138-6-vincent.fu@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>