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block: Add PreallocMode to BD.bdrv_truncate() 

Add a PreallocMode parameter to the bdrv_truncate() function implemented
by each block driver. Currently, we always pass PREALLOC_MODE_OFF and no
driver accepts anything else.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20170613202107.10125-2-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2017-06-13 22:20:52 +02:00
parent 32a1681adc
commit 8243ccb743
14 changed files with 98 additions and 15 deletions
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2
block.c
View File

@ -3434,7 +3434,7 @@ int bdrv_truncate(BdrvChild *child, int64_t offset, Error **errp)
assert(!(bs->open_flags & BDRV_O_INACTIVE));
ret = drv->bdrv_truncate(bs, offset, errp);
ret = drv->bdrv_truncate(bs, offset, PREALLOC_MODE_OFF, errp);
if (ret == 0) {
ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
bdrv_dirty_bitmap_truncate(bs);

9
block/blkdebug.c
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@ -821,8 +821,15 @@ static int64_t blkdebug_getlength(BlockDriverState *bs)
return bdrv_getlength(bs->file->bs);
}
static int blkdebug_truncate(BlockDriverState *bs, int64_t offset, Error **errp)
static int blkdebug_truncate(BlockDriverState *bs, int64_t offset,
PreallocMode prealloc, Error **errp)
{
if (prealloc != PREALLOC_MODE_OFF) {
error_setg(errp, "Unsupported preallocation mode '%s'",
PreallocMode_lookup[prealloc]);
return -ENOTSUP;
}
return bdrv_truncate(bs->file, offset, errp);
}

8
block/crypto.c
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@ -361,12 +361,18 @@ static int block_crypto_create_generic(QCryptoBlockFormat format,
}
static int block_crypto_truncate(BlockDriverState *bs, int64_t offset,
Error **errp)
PreallocMode prealloc, Error **errp)
{
BlockCrypto *crypto = bs->opaque;
size_t payload_offset =
qcrypto_block_get_payload_offset(crypto->block);
if (prealloc != PREALLOC_MODE_OFF) {
error_setg(errp, "Unsupported preallocation mode '%s'",
PreallocMode_lookup[prealloc]);
return -ENOTSUP;
}
offset += payload_offset;
return bdrv_truncate(bs->file, offset, errp);

9
block/file-posix.c
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@ -1624,12 +1624,19 @@ static void raw_close(BlockDriverState *bs)
}
}
static int raw_truncate(BlockDriverState *bs, int64_t offset, Error **errp)
static int raw_truncate(BlockDriverState *bs, int64_t offset,
PreallocMode prealloc, Error **errp)
{
BDRVRawState *s = bs->opaque;
struct stat st;
int ret;
if (prealloc != PREALLOC_MODE_OFF) {
error_setg(errp, "Unsupported preallocation mode '%s'",
PreallocMode_lookup[prealloc]);
return -ENOTSUP;
}
if (fstat(s->fd, &st)) {
ret = -errno;
error_setg_errno(errp, -ret, "Failed to fstat() the file");

9
block/file-win32.c
View File

@ -461,12 +461,19 @@ static void raw_close(BlockDriverState *bs)
}
}
static int raw_truncate(BlockDriverState *bs, int64_t offset, Error **errp)
static int raw_truncate(BlockDriverState *bs, int64_t offset,
PreallocMode prealloc, Error **errp)
{
BDRVRawState *s = bs->opaque;
LONG low, high;
DWORD dwPtrLow;
if (prealloc != PREALLOC_MODE_OFF) {
error_setg(errp, "Unsupported preallocation mode '%s'",
PreallocMode_lookup[prealloc]);
return -ENOTSUP;
}
low = offset;
high = offset >> 32;

8
block/gluster.c
View File

@ -1096,11 +1096,17 @@ static coroutine_fn int qemu_gluster_co_rw(BlockDriverState *bs,
}
static int qemu_gluster_truncate(BlockDriverState *bs, int64_t offset,
Error **errp)
PreallocMode prealloc, Error **errp)
{
int ret;
BDRVGlusterState *s = bs->opaque;
if (prealloc != PREALLOC_MODE_OFF) {
error_setg(errp, "Unsupported preallocation mode '%s'",
PreallocMode_lookup[prealloc]);
return -ENOTSUP;
}
ret = glfs_ftruncate(s->fd, offset);
if (ret < 0) {
ret = -errno;

9
block/iscsi.c
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@ -2079,11 +2079,18 @@ static void iscsi_reopen_commit(BDRVReopenState *reopen_state)
}
}
static int iscsi_truncate(BlockDriverState *bs, int64_t offset, Error **errp)
static int iscsi_truncate(BlockDriverState *bs, int64_t offset,
PreallocMode prealloc, Error **errp)
{
IscsiLun *iscsilun = bs->opaque;
Error *local_err = NULL;
if (prealloc != PREALLOC_MODE_OFF) {
error_setg(errp, "Unsupported preallocation mode '%s'",
PreallocMode_lookup[prealloc]);
return -ENOTSUP;
}
if (iscsilun->type != TYPE_DISK) {
error_setg(errp, "Cannot resize non-disk iSCSI devices");
return -ENOTSUP;

9
block/nfs.c
View File

@ -759,11 +759,18 @@ static int64_t nfs_get_allocated_file_size(BlockDriverState *bs)
return (task.ret < 0 ? task.ret : st.st_blocks * 512);
}
static int nfs_file_truncate(BlockDriverState *bs, int64_t offset, Error **errp)
static int nfs_file_truncate(BlockDriverState *bs, int64_t offset,
PreallocMode prealloc, Error **errp)
{
NFSClient *client = bs->opaque;
int ret;
if (prealloc != PREALLOC_MODE_OFF) {
error_setg(errp, "Unsupported preallocation mode '%s'",
PreallocMode_lookup[prealloc]);
return -ENOTSUP;
}
ret = nfs_ftruncate(client->context, client->fh, offset);
if (ret < 0) {
error_setg_errno(errp, -ret, "Failed to truncate file");

9
block/qcow2.c
View File

@ -3058,12 +3058,19 @@ static coroutine_fn int qcow2_co_pdiscard(BlockDriverState *bs,
return ret;
}
static int qcow2_truncate(BlockDriverState *bs, int64_t offset, Error **errp)
static int qcow2_truncate(BlockDriverState *bs, int64_t offset,
PreallocMode prealloc, Error **errp)
{
BDRVQcow2State *s = bs->opaque;
int64_t new_l1_size;
int ret;
if (prealloc != PREALLOC_MODE_OFF) {
error_setg(errp, "Unsupported preallocation mode '%s'",
PreallocMode_lookup[prealloc]);
return -ENOTSUP;
}
if (offset & 511) {
error_setg(errp, "The new size must be a multiple of 512");
return -EINVAL;

9
block/qed.c
View File

@ -1342,12 +1342,19 @@ static int coroutine_fn bdrv_qed_co_pwrite_zeroes(BlockDriverState *bs,
QED_AIOCB_WRITE | QED_AIOCB_ZERO);
}
static int bdrv_qed_truncate(BlockDriverState *bs, int64_t offset, Error **errp)
static int bdrv_qed_truncate(BlockDriverState *bs, int64_t offset,
PreallocMode prealloc, Error **errp)
{
BDRVQEDState *s = bs->opaque;
uint64_t old_image_size;
int ret;
if (prealloc != PREALLOC_MODE_OFF) {
error_setg(errp, "Unsupported preallocation mode '%s'",
PreallocMode_lookup[prealloc]);
return -ENOTSUP;
}
if (!qed_is_image_size_valid(offset, s->header.cluster_size,
s->header.table_size)) {
error_setg(errp, "Invalid image size specified");

9
block/raw-format.c
View File

@ -352,10 +352,17 @@ static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
}
}
static int raw_truncate(BlockDriverState *bs, int64_t offset, Error **errp)
static int raw_truncate(BlockDriverState *bs, int64_t offset,
PreallocMode prealloc, Error **errp)
{
BDRVRawState *s = bs->opaque;
if (prealloc != PREALLOC_MODE_OFF) {
error_setg(errp, "Unsupported preallocation mode '%s'",
PreallocMode_lookup[prealloc]);
return -ENOTSUP;
}
if (s->has_size) {
error_setg(errp, "Cannot resize fixed-size raw disks");
return -ENOTSUP;

9
block/rbd.c
View File

@ -936,11 +936,18 @@ static int64_t qemu_rbd_getlength(BlockDriverState *bs)
return info.size;
}
static int qemu_rbd_truncate(BlockDriverState *bs, int64_t offset, Error **errp)
static int qemu_rbd_truncate(BlockDriverState *bs, int64_t offset,
PreallocMode prealloc, Error **errp)
{
BDRVRBDState *s = bs->opaque;
int r;
if (prealloc != PREALLOC_MODE_OFF) {
error_setg(errp, "Unsupported preallocation mode '%s'",
PreallocMode_lookup[prealloc]);
return -ENOTSUP;
}
r = rbd_resize(s->image, offset);
if (r < 0) {
error_setg_errno(errp, -r, "Failed to resize file");

11
block/sheepdog.c
View File

@ -2153,13 +2153,20 @@ static int64_t sd_getlength(BlockDriverState *bs)
return s->inode.vdi_size;
}
static int sd_truncate(BlockDriverState *bs, int64_t offset, Error **errp)
static int sd_truncate(BlockDriverState *bs, int64_t offset,
PreallocMode prealloc, Error **errp)
{
BDRVSheepdogState *s = bs->opaque;
int ret, fd;
unsigned int datalen;
uint64_t max_vdi_size;
if (prealloc != PREALLOC_MODE_OFF) {
error_setg(errp, "Unsupported preallocation mode '%s'",
PreallocMode_lookup[prealloc]);
return -ENOTSUP;
}
max_vdi_size = (UINT64_C(1) << s->inode.block_size_shift) * MAX_DATA_OBJS;
if (offset < s->inode.vdi_size) {
error_setg(errp, "shrinking is not supported");
@ -2448,7 +2455,7 @@ static coroutine_fn int sd_co_writev(BlockDriverState *bs, int64_t sector_num,
BDRVSheepdogState *s = bs->opaque;
if (offset > s->inode.vdi_size) {
ret = sd_truncate(bs, offset, NULL);
ret = sd_truncate(bs, offset, PREALLOC_MODE_OFF, NULL);
if (ret < 0) {
return ret;
}

3
include/block/block_int.h
View File

@ -204,7 +204,8 @@ struct BlockDriver {
int coroutine_fn (*bdrv_co_flush_to_os)(BlockDriverState *bs);
const char *protocol_name;
int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset, Error **errp);
int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset,
PreallocMode prealloc, Error **errp);
int64_t (*bdrv_getlength)(BlockDriverState *bs);
bool has_variable_length;