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block: unify flags for struct bio and struct request

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Remove the current bio flags and reuse the request flags for the bio, too.
This allows to more easily trace the type of I/O from the filesystem
down to the block driver.  There were two flags in the bio that were
missing in the requests:  BIO_RW_UNPLUG and BIO_RW_AHEAD.  Also I've
renamed two request flags that had a superflous RW in them.

Note that the flags are in bio.h despite having the REQ_ name - as
blkdev.h includes bio.h that is the only way to go for now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Christoph Hellwig
2010-08-07 18:20:39 +02:00
committed by Jens Axboe
parent 33659ebbae
commit 7b6d91daee
47 changed files with 241 additions and 288 deletions
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27
kernel/trace/blktrace.c
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@@ -169,9 +169,12 @@ static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector,
static const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ),
BLK_TC_ACT(BLK_TC_WRITE) };
#define BLK_TC_HARDBARRIER BLK_TC_BARRIER
#define BLK_TC_RAHEAD BLK_TC_AHEAD
/* The ilog2() calls fall out because they're constant */
#define MASK_TC_BIT(rw, __name) ((rw & (1 << BIO_RW_ ## __name)) << \
(ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - BIO_RW_ ## __name))
#define MASK_TC_BIT(rw, __name) ((rw & REQ_ ## __name) << \
(ilog2(BLK_TC_ ## __name) + BLK_TC_SHIFT - __REQ_ ## __name))
/*
* The worker for the various blk_add_trace*() types. Fills out a
@@ -194,9 +197,9 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
return;
what |= ddir_act[rw & WRITE];
what |= MASK_TC_BIT(rw, BARRIER);
what |= MASK_TC_BIT(rw, SYNCIO);
what |= MASK_TC_BIT(rw, AHEAD);
what |= MASK_TC_BIT(rw, HARDBARRIER);
what |= MASK_TC_BIT(rw, SYNC);
what |= MASK_TC_BIT(rw, RAHEAD);
what |= MASK_TC_BIT(rw, META);
what |= MASK_TC_BIT(rw, DISCARD);
@@ -662,7 +665,7 @@ static void blk_add_trace_rq(struct request_queue *q, struct request *rq,
return;
if (rq->cmd_flags & REQ_DISCARD)
rw |= (1 << BIO_RW_DISCARD);
rw |= REQ_DISCARD;
if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
what |= BLK_TC_ACT(BLK_TC_PC);
@@ -1755,20 +1758,20 @@ void blk_fill_rwbs(char *rwbs, u32 rw, int bytes)
if (rw & WRITE)
rwbs[i++] = 'W';
else if (rw & 1 << BIO_RW_DISCARD)
else if (rw & REQ_DISCARD)
rwbs[i++] = 'D';
else if (bytes)
rwbs[i++] = 'R';
else
rwbs[i++] = 'N';
if (rw & 1 << BIO_RW_AHEAD)
if (rw & REQ_RAHEAD)
rwbs[i++] = 'A';
if (rw & 1 << BIO_RW_BARRIER)
if (rw & REQ_HARDBARRIER)
rwbs[i++] = 'B';
if (rw & 1 << BIO_RW_SYNCIO)
if (rw & REQ_SYNC)
rwbs[i++] = 'S';
if (rw & 1 << BIO_RW_META)
if (rw & REQ_META)
rwbs[i++] = 'M';
rwbs[i] = '\0';
@@ -1780,7 +1783,7 @@ void blk_fill_rwbs_rq(char *rwbs, struct request *rq)
int bytes;
if (rq->cmd_flags & REQ_DISCARD)
rw |= (1 << BIO_RW_DISCARD);
rw |= REQ_DISCARD;
bytes = blk_rq_bytes(rq);