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[Qemu-devel] [PATCH 04/17] block: make bdrv_co_is_allocated static
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH 04/17] block: make bdrv_co_is_allocated static |
Date: |
Wed, 3 Jul 2013 16:34:18 +0200 |
bdrv_is_allocated can detect coroutine context and go through a fast
path, similar to other block layer functions.
Signed-off-by: Paolo Bonzini <address@hidden>
---
block.c | 24 +++++++++++++++---------
block/raw.c | 2 +-
block/stream.c | 4 ++--
include/block/block.h | 2 --
4 files changed, 18 insertions(+), 14 deletions(-)
diff --git a/block.c b/block.c
index 6c493ad..8ca36e1 100644
--- a/block.c
+++ b/block.c
@@ -2508,7 +2508,7 @@ static int coroutine_fn bdrv_co_do_readv(BlockDriverState
*bs,
if (flags & BDRV_REQ_COPY_ON_READ) {
int pnum;
- ret = bdrv_co_is_allocated(bs, sector_num, nb_sectors, &pnum);
+ ret = bdrv_is_allocated(bs, sector_num, nb_sectors, &pnum);
if (ret < 0) {
goto out;
}
@@ -2953,8 +2953,9 @@ typedef struct BdrvCoIsAllocatedData {
* 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes
* beyond the end of the disk image it will be clamped.
*/
-int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
- int nb_sectors, int *pnum)
+static int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs,
+ int64_t sector_num,
+ int nb_sectors, int *pnum)
{
int64_t n;
@@ -3004,10 +3005,15 @@ int bdrv_is_allocated(BlockDriverState *bs, int64_t
sector_num, int nb_sectors,
.done = false,
};
- co = qemu_coroutine_create(bdrv_is_allocated_co_entry);
- qemu_coroutine_enter(co, &data);
- while (!data.done) {
- qemu_aio_wait();
+ if (qemu_in_coroutine()) {
+ /* Fast-path if already in coroutine context */
+ bdrv_is_allocated_co_entry(&data);
+ } else {
+ co = qemu_coroutine_create(bdrv_is_allocated_co_entry);
+ qemu_coroutine_enter(co, &data);
+ while (!data.done) {
+ qemu_aio_wait();
+ }
}
return data.ret;
}
@@ -3035,8 +3041,8 @@ int coroutine_fn
bdrv_co_is_allocated_above(BlockDriverState *top,
intermediate = top;
while (intermediate && intermediate != base) {
int pnum_inter;
- ret = bdrv_co_is_allocated(intermediate, sector_num, nb_sectors,
- &pnum_inter);
+ ret = bdrv_is_allocated(intermediate, sector_num, nb_sectors,
+ &pnum_inter);
if (ret < 0) {
return ret;
} else if (ret) {
diff --git a/block/raw.c b/block/raw.c
index ce10422..df4a868 100644
--- a/block/raw.c
+++ b/block/raw.c
@@ -39,7 +39,7 @@ static int coroutine_fn raw_co_is_allocated(BlockDriverState
*bs,
int64_t sector_num,
int nb_sectors, int *pnum)
{
- return bdrv_co_is_allocated(bs->file, sector_num, nb_sectors, pnum);
+ return bdrv_is_allocated(bs->file, sector_num, nb_sectors, pnum);
}
static int64_t raw_getlength(BlockDriverState *bs)
diff --git a/block/stream.c b/block/stream.c
index 7fe9e48..fb1f9c3 100644
--- a/block/stream.c
+++ b/block/stream.c
@@ -115,8 +115,8 @@ wait:
break;
}
- ret = bdrv_co_is_allocated(bs, sector_num,
- STREAM_BUFFER_SIZE / BDRV_SECTOR_SIZE, &n);
+ ret = bdrv_is_allocated(bs, sector_num,
+ STREAM_BUFFER_SIZE / BDRV_SECTOR_SIZE, &n);
if (ret == 1) {
/* Allocated in the top, no need to copy. */
copy = false;
diff --git a/include/block/block.h b/include/block/block.h
index dd8eca1..47a336a 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -178,8 +178,6 @@ int coroutine_fn bdrv_co_writev(BlockDriverState *bs,
int64_t sector_num,
*/
int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
int nb_sectors);
-int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
- int nb_sectors, int *pnum);
int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top,
BlockDriverState *base,
int64_t sector_num,
--
1.8.2.1
- [Qemu-devel] [PATCH 00/17] Add qemu-img subcommand to dump file metadata, Paolo Bonzini, 2013/07/03
- [Qemu-devel] [PATCH 01/17] cow: make reads go at a decent speed, Paolo Bonzini, 2013/07/03
- [Qemu-devel] [PATCH 02/17] cow: make writes go at a less indecent speed, Paolo Bonzini, 2013/07/03
- [Qemu-devel] [PATCH 03/17] cow: do not call bdrv_co_is_allocated, Paolo Bonzini, 2013/07/03
- [Qemu-devel] [PATCH 04/17] block: make bdrv_co_is_allocated static,
Paolo Bonzini <=
- [Qemu-devel] [PATCH 05/17] block: remove bdrv_is_allocated_above/bdrv_co_is_allocated_above distinction, Paolo Bonzini, 2013/07/03
- [Qemu-devel] [PATCH 07/17] qemu-img: always probe the input image for allocated sectors, Paolo Bonzini, 2013/07/03
- [Qemu-devel] [PATCH 06/17] block: expect errors from bdrv_co_is_allocated, Paolo Bonzini, 2013/07/03
- [Qemu-devel] [PATCH 08/17] block: make bdrv_has_zero_init return false for copy-on-write-images, Paolo Bonzini, 2013/07/03
- [Qemu-devel] [PATCH 09/17] block: introduce bdrv_get_block_status API, Paolo Bonzini, 2013/07/03
- [Qemu-devel] [PATCH 10/17] block: define get_block_status return value, Paolo Bonzini, 2013/07/03