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block: Add flags to BlockDriver.bdrv_co_truncate() 

This adds a new BdrvRequestFlags parameter to the .bdrv_co_truncate()
driver callbacks, and a supported_truncate_flags field in
BlockDriverState that allows drivers to advertise support for request
flags in the context of truncate.

For now, we always pass 0 and no drivers declare support for any flag.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200424125448.63318-2-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2020-04-24 14:54:39 +02:00
parent 3fb6108707
commit 92b92799dc
15 changed files with 33 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
block/crypto.c
View File

@ -299,7 +299,8 @@ static int block_crypto_co_create_generic(BlockDriverState *bs,
static int coroutine_fn
block_crypto_co_truncate(BlockDriverState *bs, int64_t offset, bool exact,
PreallocMode prealloc, Error **errp)
PreallocMode prealloc, BdrvRequestFlags flags,
Error **errp)
{
BlockCrypto *crypto = bs->opaque;
uint64_t payload_offset =

2
block/file-posix.c
View File

@ -2080,7 +2080,7 @@ raw_regular_truncate(BlockDriverState *bs, int fd, int64_t offset,
static int coroutine_fn raw_co_truncate(BlockDriverState *bs, int64_t offset,
bool exact, PreallocMode prealloc,
Error **errp)
BdrvRequestFlags flags, Error **errp)
{
BDRVRawState *s = bs->opaque;
struct stat st;

2
block/file-win32.c
View File

@ -469,7 +469,7 @@ static void raw_close(BlockDriverState *bs)
static int coroutine_fn raw_co_truncate(BlockDriverState *bs, int64_t offset,
bool exact, PreallocMode prealloc,
Error **errp)
BdrvRequestFlags flags, Error **errp)
{
BDRVRawState *s = bs->opaque;
LONG low, high;

1
block/gluster.c
View File

@ -1228,6 +1228,7 @@ static coroutine_fn int qemu_gluster_co_truncate(BlockDriverState *bs,
int64_t offset,
bool exact,
PreallocMode prealloc,
BdrvRequestFlags flags,
Error **errp)
{
BDRVGlusterState *s = bs->opaque;

8
block/io.c
View File

@ -3344,6 +3344,7 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset, bool exact,
BlockDriverState *bs = child->bs;
BlockDriver *drv = bs->drv;
BdrvTrackedRequest req;
BdrvRequestFlags flags = 0;
int64_t old_size, new_bytes;
int ret;
@ -3394,7 +3395,12 @@ int coroutine_fn bdrv_co_truncate(BdrvChild *child, int64_t offset, bool exact,
}
if (drv->bdrv_co_truncate) {
ret = drv->bdrv_co_truncate(bs, offset, exact, prealloc, errp);
if (flags & ~bs->supported_truncate_flags) {
error_setg(errp, "Block driver does not support requested flags");
ret = -ENOTSUP;
goto out;
}
ret = drv->bdrv_co_truncate(bs, offset, exact, prealloc, flags, errp);
} else if (bs->file && drv->is_filter) {
ret = bdrv_co_truncate(bs->file, offset, exact, prealloc, errp);
} else {

2
block/iscsi.c
View File

@ -2124,7 +2124,7 @@ static void iscsi_reopen_commit(BDRVReopenState *reopen_state)
static int coroutine_fn iscsi_co_truncate(BlockDriverState *bs, int64_t offset,
bool exact, PreallocMode prealloc,
Error **errp)
BdrvRequestFlags flags, Error **errp)
{
IscsiLun *iscsilun = bs->opaque;
int64_t cur_length;

3
block/nfs.c
View File

@ -755,7 +755,8 @@ static int64_t nfs_get_allocated_file_size(BlockDriverState *bs)
static int coroutine_fn
nfs_file_co_truncate(BlockDriverState *bs, int64_t offset, bool exact,
PreallocMode prealloc, Error **errp)
PreallocMode prealloc, BdrvRequestFlags flags,
Error **errp)
{
NFSClient *client = bs->opaque;
int ret;

2
block/qcow2.c
View File

@ -3964,7 +3964,7 @@ fail:
static int coroutine_fn qcow2_co_truncate(BlockDriverState *bs, int64_t offset,
bool exact, PreallocMode prealloc,
Error **errp)
BdrvRequestFlags flags, Error **errp)
{
BDRVQcow2State *s = bs->opaque;
uint64_t old_length;

1
block/qed.c
View File

@ -1467,6 +1467,7 @@ static int coroutine_fn bdrv_qed_co_truncate(BlockDriverState *bs,
int64_t offset,
bool exact,
PreallocMode prealloc,
BdrvRequestFlags flags,
Error **errp)
{
BDRVQEDState *s = bs->opaque;

2
block/raw-format.c
View File

@ -371,7 +371,7 @@ static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
static int coroutine_fn raw_co_truncate(BlockDriverState *bs, int64_t offset,
bool exact, PreallocMode prealloc,
Error **errp)
BdrvRequestFlags flags, Error **errp)
{
BDRVRawState *s = bs->opaque;

1
block/rbd.c
View File

@ -1108,6 +1108,7 @@ static int coroutine_fn qemu_rbd_co_truncate(BlockDriverState *bs,
int64_t offset,
bool exact,
PreallocMode prealloc,
BdrvRequestFlags flags,
Error **errp)
{
int r;

4
block/sheepdog.c
View File

@ -2281,7 +2281,7 @@ static int64_t sd_getlength(BlockDriverState *bs)
static int coroutine_fn sd_co_truncate(BlockDriverState *bs, int64_t offset,
bool exact, PreallocMode prealloc,
Error **errp)
BdrvRequestFlags flags, Error **errp)
{
BDRVSheepdogState *s = bs->opaque;
int ret, fd;
@ -2597,7 +2597,7 @@ static coroutine_fn int sd_co_writev(BlockDriverState *bs, int64_t sector_num,
assert(!flags);
if (offset > s->inode.vdi_size) {
ret = sd_co_truncate(bs, offset, false, PREALLOC_MODE_OFF, NULL);
ret = sd_co_truncate(bs, offset, false, PREALLOC_MODE_OFF, 0, NULL);
if (ret < 0) {
return ret;
}

2
block/ssh.c
View File

@ -1298,7 +1298,7 @@ static int64_t ssh_getlength(BlockDriverState *bs)
static int coroutine_fn ssh_co_truncate(BlockDriverState *bs, int64_t offset,
bool exact, PreallocMode prealloc,
Error **errp)
BdrvRequestFlags flags, Error **errp)
{
BDRVSSHState *s = bs->opaque;

10
include/block/block_int.h
View File

@ -355,7 +355,7 @@ struct BlockDriver {
*/
int coroutine_fn (*bdrv_co_truncate)(BlockDriverState *bs, int64_t offset,
bool exact, PreallocMode prealloc,
Error **errp);
BdrvRequestFlags flags, Error **errp);
int64_t (*bdrv_getlength)(BlockDriverState *bs);
bool has_variable_length;
@ -847,6 +847,14 @@ struct BlockDriverState {
/* Flags honored during pwrite_zeroes (so far: BDRV_REQ_FUA,
* BDRV_REQ_MAY_UNMAP, BDRV_REQ_WRITE_UNCHANGED) */
unsigned int supported_zero_flags;
/*
* Flags honoured during truncate (so far: BDRV_REQ_ZERO_WRITE).
*
* If BDRV_REQ_ZERO_WRITE is given, the truncate operation must make sure
* that any added space reads as all zeros. If this can't be guaranteed,
* the operation must fail.
*/
unsigned int supported_truncate_flags;
/* the following member gives a name to every node on the bs graph. */
char node_name[32];

3
tests/test-block-iothread.c
View File

@ -46,7 +46,8 @@ static int coroutine_fn bdrv_test_co_pdiscard(BlockDriverState *bs,
static int coroutine_fn
bdrv_test_co_truncate(BlockDriverState *bs, int64_t offset, bool exact,
PreallocMode prealloc, Error **errp)
PreallocMode prealloc, BdrvRequestFlags flags,
Error **errp)
{
return 0;
}