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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2010-07-21 05:29:37 +0400 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-08-07 20:52:31 +0400 |
| commit | 6a32a8aed509e71137043d464db4a7fcd88c903e (patch) | |
| tree | 66689f31e570805a29ef129cc9ebe4c088d47837 /drivers | |
| parent | 8112586063fe53958d60218631d661533f304504 (diff) | |
| download | linux-6a32a8aed509e71137043d464db4a7fcd88c903e.tar.xz | |
scsi: convert discard to REQ_TYPE_FS from REQ_TYPE_BLOCK_PC
Jens, any reason why this isn't included in your for-2.6.36 yet?
=
From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Subject: [PATCH resend] scsi: convert discard to REQ_TYPE_FS from REQ_TYPE_BLOCK_PC
The block layer (file systems) sends discard requests as REQ_TYPE_FS
(the role of REQ_TYPE_FS is that setting up commands and interpreting
the results). But SCSI-ml treats discard requests as
REQ_TYPE_BLOCK_PC.
scsi-ml can handle discard requests as REQ_TYPE_FS
easily. scsi_setup_discard_cmnd() sets up struct request and the bio
nicely. Only remaining issue is that discard requests can't be
completed partially so we need to modify sd_done.
This conversion also fixes the problem that discard requests aren't
retried when possible (e.g. UNIT ATTENTION).
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/scsi/sd.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index fc5d69a84af5..e63b85ac8cd1 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -434,7 +434,6 @@ static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq) nr_sectors >>= 3; } - rq->cmd_type = REQ_TYPE_BLOCK_PC; rq->timeout = SD_TIMEOUT; memset(rq->cmd, 0, rq->cmd_len); @@ -1200,6 +1199,12 @@ static int sd_done(struct scsi_cmnd *SCpnt) int sense_valid = 0; int sense_deferred = 0; + if (SCpnt->request->cmd_flags & REQ_DISCARD) { + if (!result) + scsi_set_resid(SCpnt, 0); + return good_bytes; + } + if (result) { sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr); if (sense_valid) |