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[Qemu-devel] [PATCH 23/27] block/parallels: create bat_entry_off helper
From: |
Denis V. Lunev |
Subject: |
[Qemu-devel] [PATCH 23/27] block/parallels: create bat_entry_off helper |
Date: |
Tue, 10 Mar 2015 11:51:17 +0300 |
calculate offset of the BAT entry in the image file.
Signed-off-by: Denis V. Lunev <address@hidden>
CC: Roman Kagan <address@hidden>
CC: Kevin Wolf <address@hidden>
CC: Stefan Hajnoczi <address@hidden>
---
block/parallels.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/block/parallels.c b/block/parallels.c
index d0128c9..70445b1 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -76,6 +76,11 @@ static int64_t bat2sect(BDRVParallelsState *s, uint32_t idx)
return (uint64_t)le32_to_cpu(s->bat_bitmap[idx]) * s->off_multiplier;
}
+static uint32_t bat_entry_off(uint32_t idx)
+{
+ return sizeof(ParallelsHeader) + sizeof(uint32_t) * idx;
+}
+
static int64_t seek_to_sector(BDRVParallelsState *s, int64_t sector_num)
{
uint32_t index, offset;
@@ -146,9 +151,8 @@ static int64_t allocate_cluster(BlockDriverState *bs,
int64_t sector_num)
bdrv_truncate(bs->file, (pos + s->tracks) << BDRV_SECTOR_BITS);
s->bat_bitmap[idx] = cpu_to_le32(pos / s->off_multiplier);
- ret = bdrv_pwrite(bs->file,
- sizeof(ParallelsHeader) + idx * sizeof(s->bat_bitmap[idx]),
- s->bat_bitmap + idx, sizeof(s->bat_bitmap[idx]));
+ ret = bdrv_pwrite(bs->file, bat_entry_off(idx), s->bat_bitmap + idx,
+ sizeof(s->bat_bitmap[idx]));
if (ret < 0) {
return ret;
}
@@ -384,8 +388,7 @@ static int parallels_create(const char *filename, QemuOpts
*opts, Error **errp)
}
bat_entries = DIV_ROUND_UP(total_size, cl_size);
- bat_sectors = DIV_ROUND_UP(bat_entries * sizeof(uint32_t) +
- sizeof(ParallelsHeader), cl_size);
+ bat_sectors = DIV_ROUND_UP(bat_entry_off(bat_entries), cl_size);
bat_sectors = (bat_sectors * cl_size) >> BDRV_SECTOR_BITS;
memset(&header, 0, sizeof(header));
@@ -495,7 +498,7 @@ static int parallels_open(BlockDriverState *bs, QDict
*options, int flags,
goto fail;
}
- size = sizeof(ParallelsHeader) + sizeof(uint32_t) * s->bat_size;
+ size = bat_entry_off(s->bat_size);
s->header_size = ROUND_UP(size, bdrv_opt_mem_align(bs->file));
s->header = qemu_try_blockalign(bs->file, s->header_size);
if (s->header == NULL) {
--
1.9.1
- Re: [Qemu-devel] [PATCH 22/27] block/parallels: improve image reading performance, (continued)
- [Qemu-devel] [PATCH 25/27] block/parallels: add prealloc-mode and prealloc-size open paramemets, Denis V. Lunev, 2015/03/10
- [Qemu-devel] [PATCH 17/27] block/parallels: move parallels_open/probe to the very end of the file, Denis V. Lunev, 2015/03/10
- [Qemu-devel] [PATCH 16/27] block/parallels: read parallels image header and BAT into single buffer, Denis V. Lunev, 2015/03/10
- [Qemu-devel] [PATCH 10/27] block/parallels: support parallels image creation, Denis V. Lunev, 2015/03/10
- [Qemu-devel] [PATCH 01/27] iotests, parallels: quote TEST_IMG in 076 test to be path-safe, Denis V. Lunev, 2015/03/10
- [Qemu-devel] [PATCH 03/27] block/parallels: switch to bdrv_read, Denis V. Lunev, 2015/03/10
- [Qemu-devel] [PATCH 23/27] block/parallels: create bat_entry_off helper,
Denis V. Lunev <=
- [Qemu-devel] [PATCH 06/27] block/parallels: provide _co_readv routine for parallels format driver, Denis V. Lunev, 2015/03/10
- [Qemu-devel] [PATCH 20/27] iotests, parallels: check for incorrectly closed image in tests, Denis V. Lunev, 2015/03/10
- [Qemu-devel] [PATCH 09/27] iotests, parallels: test for write into Parallels image, Denis V. Lunev, 2015/03/10
- [Qemu-devel] [PATCH 27/27] block/parallels: improve image writing performance further, Denis V. Lunev, 2015/03/10
- [Qemu-devel] [PATCH 12/27] parallels: change copyright information in the image header, Denis V. Lunev, 2015/03/10
- [Qemu-devel] [PATCH 19/27] block/parallels: implement incorrect close detection, Denis V. Lunev, 2015/03/10