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-rw-r--r--block.c8
-rw-r--r--block/crypto.c1
-rw-r--r--block/file-posix.c3
-rw-r--r--block/iscsi.c6
-rw-r--r--block/nbd.c11
-rw-r--r--block/qcow2.c3
-rw-r--r--block/qed.c1
-rw-r--r--include/block/block.h11
8 files changed, 7 insertions, 37 deletions
diff --git a/block.c b/block.c
index f94585b..814e5a0 100644
--- a/block.c
+++ b/block.c
@@ -4010,17 +4010,11 @@ bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs)
bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs)
{
- BlockDriverInfo bdi;
-
if (!(bs->open_flags & BDRV_O_UNMAP)) {
return false;
}
- if (bdrv_get_info(bs, &bdi) == 0) {
- return bdi.can_write_zeroes_with_unmap;
- }
-
- return false;
+ return bs->supported_zero_flags & BDRV_REQ_MAY_UNMAP;
}
const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
diff --git a/block/crypto.c b/block/crypto.c
index 70e3691..3df6694 100644
--- a/block/crypto.c
+++ b/block/crypto.c
@@ -576,7 +576,6 @@ static int block_crypto_get_info_luks(BlockDriverState *bs,
}
bdi->unallocated_blocks_are_zero = false;
- bdi->can_write_zeroes_with_unmap = false;
bdi->cluster_size = subbdi.cluster_size;
return 0;
diff --git a/block/file-posix.c b/block/file-posix.c
index dd8d7cb..ca49c1a 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -549,7 +549,6 @@ static int raw_open_common(BlockDriverState *bs, QDict *options,
s->has_discard = true;
s->has_write_zeroes = true;
- bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP;
if ((bs->open_flags & BDRV_O_NOCACHE) != 0) {
s->needs_alignment = true;
}
@@ -599,6 +598,7 @@ static int raw_open_common(BlockDriverState *bs, QDict *options,
}
#endif
+ bs->supported_zero_flags = s->discard_zeroes ? BDRV_REQ_MAY_UNMAP : 0;
ret = 0;
fail:
if (filename && (bdrv_flags & BDRV_O_TEMPORARY)) {
@@ -2223,7 +2223,6 @@ static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
BDRVRawState *s = bs->opaque;
bdi->unallocated_blocks_are_zero = s->discard_zeroes;
- bdi->can_write_zeroes_with_unmap = s->discard_zeroes;
return 0;
}
diff --git a/block/iscsi.c b/block/iscsi.c
index 9f99ae5..421983d 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -1877,7 +1877,6 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
if (iscsilun->dpofua) {
bs->supported_write_flags = BDRV_REQ_FUA;
}
- bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP;
/* Check the write protect flag of the LUN if we want to write */
if (iscsilun->type == TYPE_DISK && (flags & BDRV_O_RDWR) &&
@@ -1961,6 +1960,10 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
}
}
+ if (iscsilun->lbprz && iscsilun->lbp.lbpws) {
+ bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP;
+ }
+
out:
qemu_opts_del(opts);
g_free(initiator_name);
@@ -2160,7 +2163,6 @@ static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
{
IscsiLun *iscsilun = bs->opaque;
bdi->unallocated_blocks_are_zero = iscsilun->lbprz;
- bdi->can_write_zeroes_with_unmap = iscsilun->lbprz && iscsilun->lbp.lbpws;
bdi->cluster_size = iscsilun->cluster_sectors * BDRV_SECTOR_SIZE;
return 0;
}
diff --git a/block/nbd.c b/block/nbd.c
index 411eeb4..ef81a9f 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -566,14 +566,6 @@ static void nbd_refresh_filename(BlockDriverState *bs, QDict *options)
bs->full_open_options = opts;
}
-static int nbd_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
-{
- if (bs->supported_zero_flags & BDRV_REQ_MAY_UNMAP) {
- bdi->can_write_zeroes_with_unmap = true;
- }
- return 0;
-}
-
static BlockDriver bdrv_nbd = {
.format_name = "nbd",
.protocol_name = "nbd",
@@ -591,7 +583,6 @@ static BlockDriver bdrv_nbd = {
.bdrv_detach_aio_context = nbd_detach_aio_context,
.bdrv_attach_aio_context = nbd_attach_aio_context,
.bdrv_refresh_filename = nbd_refresh_filename,
- .bdrv_get_info = nbd_get_info,
};
static BlockDriver bdrv_nbd_tcp = {
@@ -611,7 +602,6 @@ static BlockDriver bdrv_nbd_tcp = {
.bdrv_detach_aio_context = nbd_detach_aio_context,
.bdrv_attach_aio_context = nbd_attach_aio_context,
.bdrv_refresh_filename = nbd_refresh_filename,
- .bdrv_get_info = nbd_get_info,
};
static BlockDriver bdrv_nbd_unix = {
@@ -631,7 +621,6 @@ static BlockDriver bdrv_nbd_unix = {
.bdrv_detach_aio_context = nbd_detach_aio_context,
.bdrv_attach_aio_context = nbd_attach_aio_context,
.bdrv_refresh_filename = nbd_refresh_filename,
- .bdrv_get_info = nbd_get_info,
};
static void bdrv_nbd_init(void)
diff --git a/block/qcow2.c b/block/qcow2.c
index a64a572..801e29f 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1479,7 +1479,7 @@ static int qcow2_do_open(BlockDriverState *bs, QDict *options, int flags,
/* Initialise locks */
qemu_co_mutex_init(&s->lock);
- bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP;
+ bs->supported_zero_flags = header.version >= 3 ? BDRV_REQ_MAY_UNMAP : 0;
/* Repair image if dirty */
if (!(flags & (BDRV_O_CHECK | BDRV_O_INACTIVE)) && !bs->read_only &&
@@ -3771,7 +3771,6 @@ static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
{
BDRVQcow2State *s = bs->opaque;
bdi->unallocated_blocks_are_zero = true;
- bdi->can_write_zeroes_with_unmap = (s->qcow_version >= 3);
bdi->cluster_size = s->cluster_size;
bdi->vm_state_offset = qcow2_vm_state_offset(s);
return 0;
diff --git a/block/qed.c b/block/qed.c
index 205dbf1..c6ff3ab 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -1438,7 +1438,6 @@ static int bdrv_qed_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
bdi->cluster_size = s->header.cluster_size;
bdi->is_dirty = s->header.features & QED_F_NEED_CHECK;
bdi->unallocated_blocks_are_zero = true;
- bdi->can_write_zeroes_with_unmap = true;
return 0;
}
diff --git a/include/block/block.h b/include/block/block.h
index 24ef816..19b3ab9 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -27,17 +27,6 @@ typedef struct BlockDriverInfo {
*/
bool unallocated_blocks_are_zero;
/*
- * True if the driver can optimize writing zeroes by unmapping
- * sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux
- * with the difference that in qemu a discard is allowed to silently
- * fail. Therefore we have to use bdrv_pwrite_zeroes with the
- * BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping.
- * After this call the driver has to guarantee that the contents read
- * back as zero. It is additionally required that the block device is
- * opened with BDRV_O_UNMAP flag for this to work.
- */
- bool can_write_zeroes_with_unmap;
- /*
* True if this block driver only supports compressed writes
*/
bool needs_compressed_writes;
generated by cgit v1.1 at 2024-12-25 13:57:11 +0000