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SCSI fixes on 20140731

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This is a potential data corruption fix: If we get an error sending down a
 barrier, we simply ignore it meaning the barrier semantics get violated
 without anyone being any the wiser.  If the system crashes at this point, the
 filesystem potentially becomes corrupt.  Fix is to report errors on failed
 barriers.
 
 Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

Pull SCSI barrier fix from James Bottomley:
 "This is a potential data corruption fix: If we get an error sending
  down a barrier, we simply ignore it meaning the barrier semantics get
  violated without anyone being any the wiser.  If the system crashes at
  this point, the filesystem potentially becomes corrupt.  Fix is to
  report errors on failed barriers"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: handle flush errors properly
This commit is contained in:
Linus Torvalds 2014-07-31 10:00:42 -07:00
commit 48418bb6e3
1 changed files with 8 additions and 0 deletions
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8
drivers/scsi/scsi_lib.c
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@ -733,6 +733,14 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes)
scsi_next_command(cmd);
return;
}
} else if (blk_rq_bytes(req) == 0 && result && !sense_deferred) {
/*
* Certain non BLOCK_PC requests are commands that don't
* actually transfer anything (FLUSH), so cannot use
* good_bytes != blk_rq_bytes(req) as the signal for an error.
* This sets the error explicitly for the problem case.
*/
error = __scsi_error_from_host_byte(cmd, result);
}
/* no bidi support for !REQ_TYPE_BLOCK_PC yet */