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Programming
write() issue during a low level hdd access
Post 302397265 by sponnusa on Sunday 21st of February 2010 04:39:16 PM
02-21-2010
I wanted the write to fail only for the bad sectors, but it was failing for all the sectors in the O_DIRECT mode, but I got a working program. (Well, working means, I was able to write to the sectors, but still could not get it to fail for the bad sectors).
As i had updated in my previous post, i had created a small program which writes to the sectors with O_DIRECT. I guess i might have made some mistake in my original O_DIRECT try. (lets leave it apart!
)
But, even with the O_DIRECT and O_SYNC flags in place, the write passes for all the bad sectors.
Is there anything that has be enabled / checked?
Thank you for the replies.
As i had updated in my previous post, i had created a small program which writes to the sectors with O_DIRECT. I guess i might have made some mistake in my original O_DIRECT try. (lets leave it apart!
)But, even with the O_DIRECT and O_SYNC flags in place, the write passes for all the bad sectors.
Is there anything that has be enabled / checked?
Thank you for the replies.
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LEARN ABOUT DEBIAN
blockdev
BLOCKDEV(8) System Administration BLOCKDEV(8) NAME
blockdev - call block device ioctls from the command line SYNOPSIS
blockdev [-q] [-v] command [command...] device [device...] blockdev --report [device...] DESCRIPTION
The utility blockdev allows one to call block device ioctls from the command line. OPTIONS
-V Print version and exit. -q Be quiet. -v Be verbose. --report Print a report for the specified device. It is possible to give multiple devices. If none is given, all devices which appear in /proc/partitions are shown. Note that the partition StartSec is in 512-byte sectors. COMMANDS
It is possible to give multiple devices and multiple commands. --flushbufs Flush buffers. --getalignoff Get alignment offset. --getbsz Print blocksize in bytes. --getdiscardzeroes Get discard zeroes support status. --getfra Get filesystem readahead in 512-byte sectors. --getiomin Get minimum I/O size. --getioopt Get optimal I/O size. --getmaxsect Get max sectors per request --getpbsz Get physical block (sector) size. --getra Print readahead (in 512-byte sectors). --getro Get read-only. Print 1 if the device is read-only, 0 otherwise. --getsize64 Print device size in bytes. --getsize Print device size (32-bit!) in sectors. Deprecated in favor of the --getsz option. --getss Print sectorsize in bytes - usually 512. --getsz Get size in 512-byte sectors. --rereadpt Reread partition table --setbsz bytes Set blocksize. --setfra sectors Set filesystem readahead (same like --setra on 2.6 kernels). --setra sectors Set readahead (in 512-byte sectors). --setro Set read-only. --setrw Set read-write. AUTHOR
blockdev was written by Andries E. Brouwer and rewritten by Karel Zak. AVAILABILITY
The blockdev command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. util-linux August 2010 BLOCKDEV(8)