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[Qemu-devel] [RFC PATCH 10/19] block: Introduce bdrv_co_do_pwritev()
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [RFC PATCH 10/19] block: Introduce bdrv_co_do_pwritev() |
Date: |
Fri, 6 Dec 2013 18:22:51 +0100 |
This is going to become the bdrv_co_do_preadv() equivalent for reads. In
this patch, however, just a function taking byte offsets is created, it
doesn't align anything yet.
Signed-off-by: Kevin Wolf <address@hidden>
---
block.c | 23 +++++++++++++++++------
1 file changed, 17 insertions(+), 6 deletions(-)
diff --git a/block.c b/block.c
index f8ed623..8825984 100644
--- a/block.c
+++ b/block.c
@@ -2906,8 +2906,8 @@ static int coroutine_fn
bdrv_aligned_pwritev(BlockDriverState *bs,
/*
* Handle a write request in coroutine context
*/
-static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs,
- int64_t sector_num, int nb_sectors, QEMUIOVector *qiov,
+static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs,
+ int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
BdrvRequestFlags flags)
{
int ret;
@@ -2918,21 +2918,32 @@ static int coroutine_fn
bdrv_co_do_writev(BlockDriverState *bs,
if (bs->read_only) {
return -EACCES;
}
- if (bdrv_check_request(bs, sector_num, nb_sectors)) {
+ if (bdrv_check_byte_request(bs, offset, bytes)) {
return -EIO;
}
/* throttling disk I/O */
if (bs->io_limits_enabled) {
- bdrv_io_limits_intercept(bs, nb_sectors, true);
+ bdrv_io_limits_intercept(bs, bytes << BDRV_SECTOR_BITS, true);
}
- ret = bdrv_aligned_pwritev(bs, sector_num << BDRV_SECTOR_BITS,
- nb_sectors << BDRV_SECTOR_BITS, qiov, flags);
+ ret = bdrv_aligned_pwritev(bs, offset, bytes, qiov, flags);
return ret;
}
+static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs,
+ int64_t sector_num, int nb_sectors, QEMUIOVector *qiov,
+ BdrvRequestFlags flags)
+{
+ if (nb_sectors < 0 || nb_sectors > (UINT_MAX >> BDRV_SECTOR_BITS)) {
+ return -EINVAL;
+ }
+
+ return bdrv_co_do_pwritev(bs, sector_num << BDRV_SECTOR_BITS,
+ nb_sectors << BDRV_SECTOR_BITS, qiov, flags);
+}
+
int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov)
{
--
1.8.1.4
- [Qemu-devel] [RFC PATCH 01/19] qemu_memalign: Allow small alignments, (continued)
- [Qemu-devel] [RFC PATCH 01/19] qemu_memalign: Allow small alignments, Kevin Wolf, 2013/12/06
- [Qemu-devel] [RFC PATCH 02/19] block: Detect unaligned length in bdrv_qiov_is_aligned(), Kevin Wolf, 2013/12/06
- [Qemu-devel] [RFC PATCH 03/19] block: Don't use guest sector size for qemu_blockalign(), Kevin Wolf, 2013/12/06
- [Qemu-devel] [RFC PATCH 04/19] block: rename buffer_alignment to guest_block_size, Kevin Wolf, 2013/12/06
- [Qemu-devel] [RFC PATCH 05/19] raw: Probe required direct I/O alignment, Kevin Wolf, 2013/12/06
- [Qemu-devel] [RFC PATCH 06/19] block: Introduce bdrv_aligned_preadv(), Kevin Wolf, 2013/12/06
- [Qemu-devel] [RFC PATCH 07/19] block: Introduce bdrv_co_do_preadv(), Kevin Wolf, 2013/12/06
- [Qemu-devel] [RFC PATCH 08/19] block: Introduce bdrv_aligned_pwritev(), Kevin Wolf, 2013/12/06
- [Qemu-devel] [RFC PATCH 09/19] block: write: Handle COR dependency after I/O throttling, Kevin Wolf, 2013/12/06
- [Qemu-devel] [RFC PATCH 10/19] block: Introduce bdrv_co_do_pwritev(),
Kevin Wolf <=
- [Qemu-devel] [RFC PATCH 11/19] block: Switch BdrvTrackedRequest to byte granularity, Kevin Wolf, 2013/12/06
- [Qemu-devel] [RFC PATCH 12/19] block: Allow waiting for overlapping requests between begin/end, Kevin Wolf, 2013/12/06
- [Qemu-devel] [RFC PATCH 13/19] block: Make zero-after-EOF work with larger alignment, Kevin Wolf, 2013/12/06
- [Qemu-devel] [RFC PATCH 14/19] block: Generalise and optimise COR serialisation, Kevin Wolf, 2013/12/06
- [Qemu-devel] [RFC PATCH 15/19] block: Make overlap range for serialisation dynamic, Kevin Wolf, 2013/12/06
- [Qemu-devel] [RFC PATCH 16/19] block: Align requests in bdrv_co_do_pwritev(), Kevin Wolf, 2013/12/06
- [Qemu-devel] [RFC PATCH 17/19] block: Change coroutine wrapper to byte granularity, Kevin Wolf, 2013/12/06
- [Qemu-devel] [RFC PATCH 18/19] block: Make bdrv_pread() a bdrv_prwv_co() wrapper, Kevin Wolf, 2013/12/06
- [Qemu-devel] [RFC PATCH 19/19] block: Make bdrv_pwrite() a bdrv_prwv_co() wrapper, Kevin Wolf, 2013/12/06
- Re: [Qemu-devel] [RFC PATCH 00/19] block: Support for 512b-on-4k emulation, Paolo Bonzini, 2013/12/06