blktrace: support discard requests
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/blktrace.c b/block/blktrace.c
index eb9651c..7495a84 100644
--- a/block/blktrace.c
+++ b/block/blktrace.c
@@ -114,7 +114,13 @@
/*
* Bio action bits of interest
*/
-static u32 bio_act[9] __read_mostly = { 0, BLK_TC_ACT(BLK_TC_BARRIER), BLK_TC_ACT(BLK_TC_SYNC), 0, BLK_TC_ACT(BLK_TC_AHEAD), 0, 0, 0, BLK_TC_ACT(BLK_TC_META) };
+static u32 bio_act[17] __read_mostly = {
+ [1] = BLK_TC_ACT(BLK_TC_BARRIER),
+ [2] = BLK_TC_ACT(BLK_TC_SYNC),
+ [4] = BLK_TC_ACT(BLK_TC_AHEAD),
+ [8] = BLK_TC_ACT(BLK_TC_META),
+ [16] = BLK_TC_ACT(BLK_TC_DISCARD)
+};
/*
* More could be added as needed, taking care to increment the decrementer
@@ -128,6 +134,8 @@
(((rw) & (1 << BIO_RW_AHEAD)) << (2 - BIO_RW_AHEAD))
#define trace_meta_bit(rw) \
(((rw) & (1 << BIO_RW_META)) >> (BIO_RW_META - 3))
+#define trace_discard_bit(rw) \
+ (((rw) & (1 << BIO_RW_DISCARD)) >> (BIO_RW_DISCARD - 4))
/*
* The worker for the various blk_add_trace*() types. Fills out a
@@ -151,6 +159,7 @@
what |= bio_act[trace_sync_bit(rw)];
what |= bio_act[trace_ahead_bit(rw)];
what |= bio_act[trace_meta_bit(rw)];
+ what |= bio_act[trace_discard_bit(rw)];
pid = tsk->pid;
if (unlikely(act_log_check(bt, what, sector, pid)))
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index d084b8d..27da2cc 100644
--- a/include/linux/blktrace_api.h
+++ b/include/linux/blktrace_api.h
@@ -21,6 +21,7 @@
BLK_TC_NOTIFY = 1 << 10, /* special message */
BLK_TC_AHEAD = 1 << 11, /* readahead */
BLK_TC_META = 1 << 12, /* metadata */
+ BLK_TC_DISCARD = 1 << 13, /* discard requests */
BLK_TC_END = 1 << 15, /* only 16-bits, reminder */
};
@@ -195,6 +196,9 @@
if (likely(!bt))
return;
+ if (blk_discard_rq(rq))
+ rw |= (1 << BIO_RW_DISCARD);
+
if (blk_pc_request(rq)) {
what |= BLK_TC_ACT(BLK_TC_PC);
__blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors, sizeof(rq->cmd), rq->cmd);