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[PATCH v2 1/3] block: Add bdrv_co_get_lba_status
From: |
Lin Ma |
Subject: |
[PATCH v2 1/3] block: Add bdrv_co_get_lba_status |
Date: |
Wed, 17 Jun 2020 18:20:17 +0800 |
The get lba status wrapper based on the bdrv_block_status. The following
patches will add GET LBA STATUS 16 support for scsi emulation layer.
Signed-off-by: Lin Ma <lma@suse.com>
---
block/io.c | 43 +++++++++++++++++++++++++++++++++++++++
include/block/block_int.h | 5 +++++
2 files changed, 48 insertions(+)
diff --git a/block/io.c b/block/io.c
index df8f2a98d4..2064016b19 100644
--- a/block/io.c
+++ b/block/io.c
@@ -2208,6 +2208,49 @@ int coroutine_fn bdrv_co_pwrite_zeroes(BdrvChild *child,
int64_t offset,
BDRV_REQ_ZERO_WRITE | flags);
}
+int coroutine_fn
+bdrv_co_get_lba_status(BdrvChild *child, int64_t offset, int64_t bytes,
+ uint32_t *num_blocks, uint32_t *is_deallocated)
+{
+ BlockDriverState *bs = child->bs;
+ int ret = 0;
+ int64_t target_size, count = 0;
+ bool first = true;
+ uint8_t wanted_bit1 = 0;
+
+ target_size = bdrv_getlength(bs);
+ if (target_size < 0) {
+ return -EIO;
+ }
+
+ if (offset < 0 || bytes < 0) {
+ return -EIO;
+ }
+
+ for ( ; offset <= target_size - bytes; offset += count) {
+ ret = bdrv_block_status(bs, offset, bytes, &count, NULL, NULL);
+ if (ret < 0) {
+ goto out;
+ }
+ if (first) {
+ if (ret & BDRV_BLOCK_ZERO) {
+ wanted_bit1 = BDRV_BLOCK_ZERO >> 1;
+ *is_deallocated = 1;
+ } else {
+ wanted_bit1 = 0;
+ }
+ first = false;
+ }
+ if ((ret & BDRV_BLOCK_ZERO) >> 1 == wanted_bit1) {
+ (*num_blocks)++;
+ } else {
+ break;
+ }
+ }
+out:
+ return ret;
+}
+
/*
* Flush ALL BDSes regardless of if they are reachable via a BlkBackend or not.
*/
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 791de6a59c..43f90591b9 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -1296,6 +1296,11 @@ int coroutine_fn
bdrv_co_block_status_from_backing(BlockDriverState *bs,
int64_t *pnum,
int64_t *map,
BlockDriverState **file);
+int coroutine_fn bdrv_co_get_lba_status(BdrvChild *child,
+ int64_t offset,
+ int64_t bytes,
+ uint32_t *num_blocks,
+ uint32_t *is_deallocated);
const char *bdrv_get_parent_name(const BlockDriverState *bs);
void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp);
bool blk_dev_has_removable_media(BlockBackend *blk);
--
2.26.0