Hi list,
is it possible, to "decache" a fileio-device without destroying it?
I have an (deactivated) cached fileio-device here:
# cat info
Status: DEACTIVATED Max Queue Depth: 0 SectorSize: 0 HwMaxSectors: 0
TCM FILEIO ID: 0 File: /dev/dm-8 Size: 5368709120 Mode:
Buffered-WCE
but flushing the buffer (or just deactivating) doesnt work:
# echo "fd_buffered_io=0" > control
bash: echo: write error: Invalid argument
And dmesg tells me:
[101828.839116] bogus fd_buffered_io=0 value
Is it not possible to deactivate buffer without destroying the fileio?
The other direction seems to work:
# echo
"fd_dev_path=/dev/dm-9,fd_dev_name=/dev/dm-9,fd_dev_size=$(blockdev
--getsize64 /dev/dm-9)" > control
# cat info
Status: DEACTIVATED Max Queue Depth: 0 SectorSize: 0 HwMaxSectors: 0
TCM FILEIO ID: 0 File: /dev/dm-9 Size: 7516192768 Mode:
O_DSYNC
# echo "fd_buffered_io=1" > control
# cat info
Status: DEACTIVATED Max Queue Depth: 0 SectorSize: 0 HwMaxSectors: 0
TCM FILEIO ID: 0 File: /dev/dm-9 Size: 7516192768 Mode:
Buffered-WCE
Tfh!
Oliver
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