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Block layer patches

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Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block layer patches

# gpg: Signature made Mon 05 Mar 2018 17:45:51 GMT
# gpg:                using RSA key 7F09B272C88F2FD6
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>"
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* remotes/kevin/tags/for-upstream: (38 commits)
  block: Fix NULL dereference on empty drive error
  qcow2: Replace align_offset() with ROUND_UP()
  block/ssh: Add basic .bdrv_truncate()
  block/ssh: Make ssh_grow_file() blocking
  block/ssh: Pull ssh_grow_file() from ssh_create()
  qemu-img: Make resize error message more general
  qcow2: make qcow2_co_create2() a coroutine_fn
  block: rename .bdrv_create() to .bdrv_co_create_opts()
  Revert "IDE: Do not flush empty CDROM drives"
  block: test blk_aio_flush() with blk->root == NULL
  block: add BlockBackend->in_flight counter
  block: extract AIO_WAIT_WHILE() from BlockDriverState
  aio: rename aio_context_in_iothread() to in_aio_context_home_thread()
  docs: document how to use the l2-cache-entry-size parameter
  specs/qcow2: Fix documentation of the compressed cluster descriptor
  iotest 033: add misaligned write-zeroes test via truncate
  block: fix write with zero flag set and iovector provided
  block: Drop unused .bdrv_co_get_block_status()
  vvfat: Switch to .bdrv_co_block_status()
  vpc: Switch to .bdrv_co_block_status()
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

# Conflicts:
#	include/block/block.h
This commit is contained in:
Peter Maydell 2018-03-06 11:20:44 +00:00
parent e1ee9ee139 bfe1a14c18
commit 58e2e17dba
48 changed files with 983 additions and 613 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
block.c
View file

@ -418,7 +418,7 @@ static void coroutine_fn bdrv_create_co_entry(void *opaque)
CreateCo *cco = opaque;
assert(cco->drv);
ret = cco->drv->bdrv_create(cco->filename, cco->opts, &local_err);
ret = cco->drv->bdrv_co_create_opts(cco->filename, cco->opts, &local_err);
error_propagate(&cco->err, local_err);
cco->ret = ret;
}
@ -437,7 +437,7 @@ int bdrv_create(BlockDriver *drv, const char* filename,
.err = NULL,
};
if (!drv->bdrv_create) {
if (!drv->bdrv_co_create_opts) {
error_setg(errp, "Driver '%s' does not support image creation", drv->format_name);
ret = -ENOTSUP;
goto out;
@ -4711,7 +4711,12 @@ out:
AioContext *bdrv_get_aio_context(BlockDriverState *bs)
{
return bs->aio_context;
return bs ? bs->aio_context : qemu_get_aio_context();
}
AioWait *bdrv_get_aio_wait(BlockDriverState *bs)
{
return bs ? &bs->wait : NULL;
}
void bdrv_coroutine_enter(BlockDriverState *bs, Coroutine *co)

20
block/blkdebug.c
View file

@ -627,15 +627,17 @@ static int coroutine_fn blkdebug_co_pdiscard(BlockDriverState *bs,
return bdrv_co_pdiscard(bs->file->bs, offset, bytes);
}
static int64_t coroutine_fn blkdebug_co_get_block_status(
BlockDriverState *bs, int64_t sector_num, int nb_sectors, int *pnum,
BlockDriverState **file)
static int coroutine_fn blkdebug_co_block_status(BlockDriverState *bs,
bool want_zero,
int64_t offset,
int64_t bytes,
int64_t *pnum,
int64_t *map,
BlockDriverState **file)
{
assert(QEMU_IS_ALIGNED(sector_num | nb_sectors,
DIV_ROUND_UP(bs->bl.request_alignment,
BDRV_SECTOR_SIZE)));
return bdrv_co_get_block_status_from_file(bs, sector_num, nb_sectors,
pnum, file);
assert(QEMU_IS_ALIGNED(offset | bytes, bs->bl.request_alignment));
return bdrv_co_block_status_from_file(bs, want_zero, offset, bytes,
pnum, map, file);
}
static void blkdebug_close(BlockDriverState *bs)
@ -907,7 +909,7 @@ static BlockDriver bdrv_blkdebug = {
.bdrv_co_flush_to_disk = blkdebug_co_flush,
.bdrv_co_pwrite_zeroes = blkdebug_co_pwrite_zeroes,
.bdrv_co_pdiscard = blkdebug_co_pdiscard,
.bdrv_co_get_block_status = blkdebug_co_get_block_status,
.bdrv_co_block_status = blkdebug_co_block_status,
.bdrv_debug_event = blkdebug_debug_event,
.bdrv_debug_breakpoint = blkdebug_debug_breakpoint,

65
block/block-backend.c
View file

@ -73,6 +73,14 @@ struct BlockBackend {
int quiesce_counter;
VMChangeStateEntry *vmsh;
bool force_allow_inactivate;
/* Number of in-flight aio requests. BlockDriverState also counts
* in-flight requests but aio requests can exist even when blk->root is
* NULL, so we cannot rely on its counter for that case.
* Accessed with atomic ops.
*/
unsigned int in_flight;
AioWait wait;
};
typedef struct BlockBackendAIOCB {
@ -1225,11 +1233,22 @@ int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags)
return bdrv_make_zero(blk->root, flags);
}
static void blk_inc_in_flight(BlockBackend *blk)
{
atomic_inc(&blk->in_flight);
}
static void blk_dec_in_flight(BlockBackend *blk)
{
atomic_dec(&blk->in_flight);
aio_wait_kick(&blk->wait);
}
static void error_callback_bh(void *opaque)
{
struct BlockBackendAIOCB *acb = opaque;
bdrv_dec_in_flight(acb->common.bs);
blk_dec_in_flight(acb->blk);
acb->common.cb(acb->common.opaque, acb->ret);
qemu_aio_unref(acb);
}
@ -1240,7 +1259,7 @@ BlockAIOCB *blk_abort_aio_request(BlockBackend *blk,
{
struct BlockBackendAIOCB *acb;
bdrv_inc_in_flight(blk_bs(blk));
blk_inc_in_flight(blk);
acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque);
acb->blk = blk;
acb->ret = ret;
@ -1263,7 +1282,7 @@ static const AIOCBInfo blk_aio_em_aiocb_info = {
static void blk_aio_complete(BlkAioEmAIOCB *acb)
{
if (acb->has_returned) {
bdrv_dec_in_flight(acb->common.bs);
blk_dec_in_flight(acb->rwco.blk);
acb->common.cb(acb->common.opaque, acb->rwco.ret);
qemu_aio_unref(acb);
}
@ -1284,7 +1303,7 @@ static BlockAIOCB *blk_aio_prwv(BlockBackend *blk, int64_t offset, int bytes,
BlkAioEmAIOCB *acb;
Coroutine *co;
bdrv_inc_in_flight(blk_bs(blk));
blk_inc_in_flight(blk);
acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque);
acb->rwco = (BlkRwCo) {
.blk = blk,
@ -1521,14 +1540,41 @@ int blk_flush(BlockBackend *blk)
void blk_drain(BlockBackend *blk)
{
if (blk_bs(blk)) {
bdrv_drain(blk_bs(blk));
BlockDriverState *bs = blk_bs(blk);
if (bs) {
bdrv_drained_begin(bs);
}
/* We may have -ENOMEDIUM completions in flight */
AIO_WAIT_WHILE(&blk->wait,
blk_get_aio_context(blk),
atomic_mb_read(&blk->in_flight) > 0);
if (bs) {
bdrv_drained_end(bs);
}
}
void blk_drain_all(void)
{
bdrv_drain_all();
BlockBackend *blk = NULL;
bdrv_drain_all_begin();
while ((blk = blk_all_next(blk)) != NULL) {
AioContext *ctx = blk_get_aio_context(blk);
aio_context_acquire(ctx);
/* We may have -ENOMEDIUM completions in flight */
AIO_WAIT_WHILE(&blk->wait, ctx,
atomic_mb_read(&blk->in_flight) > 0);
aio_context_release(ctx);
}
bdrv_drain_all_end();
}
void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error,
@ -1569,10 +1615,11 @@ static void send_qmp_error_event(BlockBackend *blk,
bool is_read, int error)
{
IoOperationType optype;
BlockDriverState *bs = blk_bs(blk);
optype = is_read ? IO_OPERATION_TYPE_READ : IO_OPERATION_TYPE_WRITE;
qapi_event_send_block_io_error(blk_name(blk),
bdrv_get_node_name(blk_bs(blk)), optype,
qapi_event_send_block_io_error(blk_name(blk), !!bs,
bs ? bdrv_get_node_name(bs) : NULL, optype,
action, blk_iostatus_is_enabled(blk),
error == ENOSPC, strerror(error),
&error_abort);

2
block/commit.c
View file

@ -265,7 +265,7 @@ static void bdrv_commit_top_child_perm(BlockDriverState *bs, BdrvChild *c,
static BlockDriver bdrv_commit_top = {
.format_name = "commit_top",
.bdrv_co_preadv = bdrv_commit_top_preadv,
.bdrv_co_get_block_status = bdrv_co_get_block_status_from_backing,
.bdrv_co_block_status = bdrv_co_block_status_from_backing,
.bdrv_refresh_filename = bdrv_commit_top_refresh_filename,
.bdrv_close = bdrv_commit_top_close,
.bdrv_child_perm = bdrv_commit_top_child_perm,

8
block/crypto.c
View file

@ -556,9 +556,9 @@ static int block_crypto_open_luks(BlockDriverState *bs,
bs, options, flags, errp);
}
static int block_crypto_create_luks(const char *filename,
QemuOpts *opts,
Error **errp)
static int coroutine_fn block_crypto_co_create_opts_luks(const char *filename,
QemuOpts *opts,
Error **errp)
{
return block_crypto_create_generic(Q_CRYPTO_BLOCK_FORMAT_LUKS,
filename, opts, errp);
@ -617,7 +617,7 @@ BlockDriver bdrv_crypto_luks = {
.bdrv_open = block_crypto_open_luks,
.bdrv_close = block_crypto_close,
.bdrv_child_perm = bdrv_format_default_perms,
.bdrv_create = block_crypto_create_luks,
.bdrv_co_create_opts = block_crypto_co_create_opts_luks,
.bdrv_truncate = block_crypto_truncate,
.create_opts = &block_crypto_create_opts_luks,

77
block/file-posix.c
View file

@ -1982,7 +1982,8 @@ static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
return (int64_t)st.st_blocks * 512;
}
static int raw_create(const char *filename, QemuOpts *opts, Error **errp)
static int coroutine_fn raw_co_create_opts(const char *filename, QemuOpts *opts,
Error **errp)
{
int fd;
int result = 0;
@ -2131,25 +2132,24 @@ static int find_allocation(BlockDriverState *bs, off_t start,
}
/*
* Returns the allocation status of the specified sectors.
* Returns the allocation status of the specified offset.
*
* If 'sector_num' is beyond the end of the disk image the return value is 0
* and 'pnum' is set to 0.
* The block layer guarantees 'offset' and 'bytes' are within bounds.
*
* 'pnum' is set to the number of sectors (including and immediately following
* the specified sector) that are known to be in the same
* 'pnum' is set to the number of bytes (including and immediately following
* the specified offset) that are known to be in the same
* allocated/unallocated state.
*
* 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes
* beyond the end of the disk image it will be clamped.
* 'bytes' is the max value 'pnum' should be set to.
*/
static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors, int *pnum,
BlockDriverState **file)
static int coroutine_fn raw_co_block_status(BlockDriverState *bs,
bool want_zero,
int64_t offset,
int64_t bytes, int64_t *pnum,
int64_t *map,
BlockDriverState **file)
{
off_t start, data = 0, hole = 0;
int64_t total_size;
off_t data = 0, hole = 0;
int ret;
ret = fd_open(bs);
@ -2157,39 +2157,36 @@ static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
return ret;
}
start = sector_num * BDRV_SECTOR_SIZE;
total_size = bdrv_getlength(bs);
if (total_size < 0) {
return total_size;
} else if (start >= total_size) {
*pnum = 0;
return 0;
} else if (start + nb_sectors * BDRV_SECTOR_SIZE > total_size) {
nb_sectors = DIV_ROUND_UP(total_size - start, BDRV_SECTOR_SIZE);
if (!want_zero) {
*pnum = bytes;
*map = offset;
*file = bs;
return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
}
ret = find_allocation(bs, start, &data, &hole);
ret = find_allocation(bs, offset, &data, &hole);
if (ret == -ENXIO) {
/* Trailing hole */
*pnum = nb_sectors;
*pnum = bytes;
ret = BDRV_BLOCK_ZERO;
} else if (ret < 0) {
/* No info available, so pretend there are no holes */
*pnum = nb_sectors;
*pnum = bytes;
ret = BDRV_BLOCK_DATA;
} else if (data == start) {
/* On a data extent, compute sectors to the end of the extent,
} else if (data == offset) {
/* On a data extent, compute bytes to the end of the extent,
* possibly including a partial sector at EOF. */
*pnum = MIN(nb_sectors, DIV_ROUND_UP(hole - start, BDRV_SECTOR_SIZE));
*pnum = MIN(bytes, hole - offset);
ret = BDRV_BLOCK_DATA;
} else {
/* On a hole, compute sectors to the beginning of the next extent. */
assert(hole == start);
*pnum = MIN(nb_sectors, (data - start) / BDRV_SECTOR_SIZE);
/* On a hole, compute bytes to the beginning of the next extent. */
assert(hole == offset);
*pnum = MIN(bytes, data - offset);
ret = BDRV_BLOCK_ZERO;
}
*map = offset;
*file = bs;
return ret | BDRV_BLOCK_OFFSET_VALID | start;
return ret | BDRV_BLOCK_OFFSET_VALID;
}
static coroutine_fn BlockAIOCB *raw_aio_pdiscard(BlockDriverState *bs,
@ -2280,9 +2277,9 @@ BlockDriver bdrv_file = {
.bdrv_reopen_commit = raw_reopen_commit,
.bdrv_reopen_abort = raw_reopen_abort,
.bdrv_close = raw_close,
.bdrv_create = raw_create,
.bdrv_co_create_opts = raw_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_co_get_block_status = raw_co_get_block_status,
.bdrv_co_block_status = raw_co_block_status,
.bdrv_co_pwrite_zeroes = raw_co_pwrite_zeroes,
.bdrv_co_preadv = raw_co_preadv,
@ -2684,8 +2681,8 @@ static coroutine_fn int hdev_co_pwrite_zeroes(BlockDriverState *bs,
return -ENOTSUP;
}
static int hdev_create(const char *filename, QemuOpts *opts,
Error **errp)
static int coroutine_fn hdev_co_create_opts(const char *filename, QemuOpts *opts,
Error **errp)
{
int fd;
int ret = 0;
@ -2758,7 +2755,7 @@ static BlockDriver bdrv_host_device = {
.bdrv_reopen_prepare = raw_reopen_prepare,
.bdrv_reopen_commit = raw_reopen_commit,
.bdrv_reopen_abort = raw_reopen_abort,
.bdrv_create = hdev_create,
.bdrv_co_create_opts = hdev_co_create_opts,
.create_opts = &raw_create_opts,
.bdrv_co_pwrite_zeroes = hdev_co_pwrite_zeroes,
@ -2880,7 +2877,7 @@ static BlockDriver bdrv_host_cdrom = {
.bdrv_reopen_prepare = raw_reopen_prepare,
.bdrv_reopen_commit = raw_reopen_commit,
.bdrv_reopen_abort = raw_reopen_abort,
.bdrv_create = hdev_create,
.bdrv_co_create_opts = hdev_co_create_opts,
.create_opts = &raw_create_opts,
@ -3011,7 +3008,7 @@ static BlockDriver bdrv_host_cdrom = {
.bdrv_reopen_prepare = raw_reopen_prepare,
.bdrv_reopen_commit = raw_reopen_commit,
.bdrv_reopen_abort = raw_reopen_abort,
.bdrv_create = hdev_create,
.bdrv_co_create_opts = hdev_co_create_opts,
.create_opts = &raw_create_opts,
.bdrv_co_preadv = raw_co_preadv,

5
block/file-win32.c
View file

@ -553,7 +553,8 @@ static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
return st.st_size;
}
static int raw_create(const char *filename, QemuOpts *opts, Error **errp)
static int coroutine_fn raw_co_create_opts(const char *filename, QemuOpts *opts,
Error **errp)
{
int fd;
int64_t total_size = 0;
@ -599,7 +600,7 @@ BlockDriver bdrv_file = {
.bdrv_file_open = raw_open,
.bdrv_refresh_limits = raw_probe_alignment,
.bdrv_close = raw_close,
.bdrv_create = raw_create,
.bdrv_co_create_opts = raw_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_aio_readv = raw_aio_readv,

83
block/gluster.c
View file

@ -1021,8 +1021,9 @@ static int qemu_gluster_do_truncate(struct glfs_fd *fd, int64_t offset,
return 0;
}
static int qemu_gluster_create(const char *filename,
QemuOpts *opts, Error **errp)
static int coroutine_fn qemu_gluster_co_create_opts(const char *filename,
QemuOpts *opts,
Error **errp)
{
BlockdevOptionsGluster *gconf;
struct glfs *glfs;
@ -1362,68 +1363,66 @@ exit:
}
/*
* Returns the allocation status of the specified sectors.
* Returns the allocation status of the specified offset.
*
* If 'sector_num' is beyond the end of the disk image the return value is 0
* and 'pnum' is set to 0.
* The block layer guarantees 'offset' and 'bytes' are within bounds.
*
* 'pnum' is set to the number of sectors (including and immediately following
* the specified sector) that are known to be in the same
* 'pnum' is set to the number of bytes (including and immediately following
* the specified offset) that are known to be in the same
* allocated/unallocated state.
*
* 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes
* beyond the end of the disk image it will be clamped.
* 'bytes' is the max value 'pnum' should be set to.
*
* (Based on raw_co_get_block_status() from file-posix.c.)
* (Based on raw_co_block_status() from file-posix.c.)
*/
static int64_t coroutine_fn qemu_gluster_co_get_block_status(
BlockDriverState *bs, int64_t sector_num, int nb_sectors, int *pnum,
BlockDriverState **file)
static int coroutine_fn qemu_gluster_co_block_status(BlockDriverState *bs,
bool want_zero,
int64_t offset,
int64_t bytes,
int64_t *pnum,
int64_t *map,
BlockDriverState **file)
{
BDRVGlusterState *s = bs->opaque;
off_t start, data = 0, hole = 0;
int64_t total_size;
off_t data = 0, hole = 0;
int ret = -EINVAL;
if (!s->fd) {
return ret;
}
start = sector_num * BDRV_SECTOR_SIZE;
total_size = bdrv_getlength(bs);
if (total_size < 0) {
return total_size;
} else if (start >= total_size) {
*pnum = 0;
return 0;
} else if (start + nb_sectors * BDRV_SECTOR_SIZE > total_size) {
nb_sectors = DIV_ROUND_UP(total_size - start, BDRV_SECTOR_SIZE);
if (!want_zero) {
*pnum = bytes;
*map = offset;
*file = bs;
return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
}
ret = find_allocation(bs, start, &data, &hole);
ret = find_allocation(bs, offset, &data, &hole);
if (ret == -ENXIO) {
/* Trailing hole */
*pnum = nb_sectors;
*pnum = bytes;
ret = BDRV_BLOCK_ZERO;
} else if (ret < 0) {
/* No info available, so pretend there are no holes */
*pnum = nb_sectors;
*pnum = bytes;
ret = BDRV_BLOCK_DATA;
} else if (data == start) {
/* On a data extent, compute sectors to the end of the extent,
} else if (data == offset) {
/* On a data extent, compute bytes to the end of the extent,
* possibly including a partial sector at EOF. */
*pnum = MIN(nb_sectors, DIV_ROUND_UP(hole - start, BDRV_SECTOR_SIZE));
*pnum = MIN(bytes, hole - offset);
ret = BDRV_BLOCK_DATA;
} else {
/* On a hole, compute sectors to the beginning of the next extent. */
assert(hole == start);
*pnum = MIN(nb_sectors, (data - start) / BDRV_SECTOR_SIZE);
/* On a hole, compute bytes to the beginning of the next extent. */
assert(hole == offset);
*pnum = MIN(bytes, data - offset);
ret = BDRV_BLOCK_ZERO;
}
*map = offset;
*file = bs;
return ret | BDRV_BLOCK_OFFSET_VALID | start;
return ret | BDRV_BLOCK_OFFSET_VALID;
}
@ -1437,7 +1436,7 @@ static BlockDriver bdrv_gluster = {
.bdrv_reopen_commit = qemu_gluster_reopen_commit,
.bdrv_reopen_abort = qemu_gluster_reopen_abort,
.bdrv_close = qemu_gluster_close,
.bdrv_create = qemu_gluster_create,
.bdrv_co_create_opts = qemu_gluster_co_create_opts,
.bdrv_getlength = qemu_gluster_getlength,
.bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
.bdrv_truncate = qemu_gluster_truncate,
@ -1451,7 +1450,7 @@ static BlockDriver bdrv_gluster = {
#ifdef CONFIG_GLUSTERFS_ZEROFILL
.bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
#endif
.bdrv_co_get_block_status = qemu_gluster_co_get_block_status,
.bdrv_co_block_status = qemu_gluster_co_block_status,
.create_opts = &qemu_gluster_create_opts,
};
@ -1465,7 +1464,7 @@ static BlockDriver bdrv_gluster_tcp = {
.bdrv_reopen_commit = qemu_gluster_reopen_commit,
.bdrv_reopen_abort = qemu_gluster_reopen_abort,
.bdrv_close = qemu_gluster_close,
.bdrv_create = qemu_gluster_create,
.bdrv_co_create_opts = qemu_gluster_co_create_opts,
.bdrv_getlength = qemu_gluster_getlength,
.bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
.bdrv_truncate = qemu_gluster_truncate,
@ -1479,7 +1478,7 @@ static BlockDriver bdrv_gluster_tcp = {
#ifdef CONFIG_GLUSTERFS_ZEROFILL
.bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
#endif
.bdrv_co_get_block_status = qemu_gluster_co_get_block_status,
.bdrv_co_block_status = qemu_gluster_co_block_status,
.create_opts = &qemu_gluster_create_opts,
};
@ -1493,7 +1492,7 @@ static BlockDriver bdrv_gluster_unix = {
.bdrv_reopen_commit = qemu_gluster_reopen_commit,
.bdrv_reopen_abort = qemu_gluster_reopen_abort,
.bdrv_close = qemu_gluster_close,
.bdrv_create = qemu_gluster_create,
.bdrv_co_create_opts = qemu_gluster_co_create_opts,
.bdrv_getlength = qemu_gluster_getlength,
.bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
.bdrv_truncate = qemu_gluster_truncate,
@ -1507,7 +1506,7 @@ static BlockDriver bdrv_gluster_unix = {
#ifdef CONFIG_GLUSTERFS_ZEROFILL
.bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
#endif
.bdrv_co_get_block_status = qemu_gluster_co_get_block_status,
.bdrv_co_block_status = qemu_gluster_co_block_status,
.create_opts = &qemu_gluster_create_opts,
};
@ -1527,7 +1526,7 @@ static BlockDriver bdrv_gluster_rdma = {
.bdrv_reopen_commit = qemu_gluster_reopen_commit,
.bdrv_reopen_abort = qemu_gluster_reopen_abort,
.bdrv_close = qemu_gluster_close,
.bdrv_create = qemu_gluster_create,
.bdrv_co_create_opts = qemu_gluster_co_create_opts,
.bdrv_getlength = qemu_gluster_getlength,
.bdrv_get_allocated_file_size = qemu_gluster_allocated_file_size,
.bdrv_truncate = qemu_gluster_truncate,
@ -1541,7 +1540,7 @@ static BlockDriver bdrv_gluster_rdma = {
#ifdef CONFIG_GLUSTERFS_ZEROFILL
.bdrv_co_pwrite_zeroes = qemu_gluster_co_pwrite_zeroes,
#endif
.bdrv_co_get_block_status = qemu_gluster_co_get_block_status,
.bdrv_co_block_status = qemu_gluster_co_block_status,
.create_opts = &qemu_gluster_create_opts,
};

98
block/io.c
View file

@ -25,6 +25,7 @@
#include "qemu/osdep.h"
#include "trace.h"
#include "sysemu/block-backend.h"
#include "block/aio-wait.h"
#include "block/blockjob.h"
#include "block/blockjob_int.h"
#include "block/block_int.h"
@ -587,16 +588,9 @@ void bdrv_inc_in_flight(BlockDriverState *bs)
atomic_inc(&bs->in_flight);
}
static void dummy_bh_cb(void *opaque)
{
}
void bdrv_wakeup(BlockDriverState *bs)
{
/* The barrier (or an atomic op) is in the caller. */
if (atomic_read(&bs->wakeup)) {
aio_bh_schedule_oneshot(qemu_get_aio_context(), dummy_bh_cb, NULL);
}
aio_wait_kick(bdrv_get_aio_wait(bs));
}
void bdrv_dec_in_flight(BlockDriverState *bs)
@ -1701,7 +1695,7 @@ int coroutine_fn bdrv_co_pwritev(BdrvChild *child,
*/
tracked_request_begin(&req, bs, offset, bytes, BDRV_TRACKED_WRITE);
if (!qiov) {
if (flags & BDRV_REQ_ZERO_WRITE) {
ret = bdrv_co_do_zero_pwritev(child, offset, bytes, flags, &req);
goto out;
}
@ -1868,30 +1862,34 @@ typedef struct BdrvCoBlockStatusData {
bool done;
} BdrvCoBlockStatusData;
int64_t coroutine_fn bdrv_co_get_block_status_from_file(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors,
int *pnum,
BlockDriverState **file)
int coroutine_fn bdrv_co_block_status_from_file(BlockDriverState *bs,
bool want_zero,
int64_t offset,
int64_t bytes,
int64_t *pnum,
int64_t *map,
BlockDriverState **file)
{
assert(bs->file && bs->file->bs);
*pnum = nb_sectors;
*pnum = bytes;
*map = offset;
*file = bs->file->bs;
return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID |
(sector_num << BDRV_SECTOR_BITS);
return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID;
}
int64_t coroutine_fn bdrv_co_get_block_status_from_backing(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors,
int *pnum,
BlockDriverState **file)
int coroutine_fn bdrv_co_block_status_from_backing(BlockDriverState *bs,
bool want_zero,
int64_t offset,
int64_t bytes,
int64_t *pnum,
int64_t *map,
BlockDriverState **file)
{
assert(bs->backing && bs->backing->bs);
*pnum = nb_sectors;
*pnum = bytes;
*map = offset;
*file = bs->backing->bs;
return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID |
(sector_num << BDRV_SECTOR_BITS);
return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID;
}
/*
@ -1899,10 +1897,10 @@ int64_t coroutine_fn bdrv_co_get_block_status_from_backing(BlockDriverState *bs,
* Drivers not implementing the functionality are assumed to not support
* backing files, hence all their sectors are reported as allocated.
*
* If 'want_zero' is true, the caller is querying for mapping purposes,
* and the result should include BDRV_BLOCK_OFFSET_VALID and
* BDRV_BLOCK_ZERO where possible; otherwise, the result may omit those
* bits particularly if it allows for a larger value in 'pnum'.
* If 'want_zero' is true, the caller is querying for mapping
* purposes, with a focus on valid BDRV_BLOCK_OFFSET_VALID, _DATA, and
* _ZERO where possible; otherwise, the result favors larger 'pnum',
* with a focus on accurate BDRV_BLOCK_ALLOCATED.
*
* If 'offset' is beyond the end of the disk image the return value is
* BDRV_BLOCK_EOF and 'pnum' is set to 0.
@ -1959,7 +1957,7 @@ static int coroutine_fn bdrv_co_block_status(BlockDriverState *bs,
/* Must be non-NULL or bdrv_getlength() would have failed */
assert(bs->drv);
if (!bs->drv->bdrv_co_get_block_status) {
if (!bs->drv->bdrv_co_block_status) {
*pnum = bytes;
ret = BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED;
if (offset + bytes == total_size) {
@ -1976,44 +1974,24 @@ static int coroutine_fn bdrv_co_block_status(BlockDriverState *bs,
bdrv_inc_in_flight(bs);
/* Round out to request_alignment boundaries */
/* TODO: until we have a byte-based driver callback, we also have to
* round out to sectors, even if that is bigger than request_alignment */
align = MAX(bs->bl.request_alignment, BDRV_SECTOR_SIZE);
align = bs->bl.request_alignment;
aligned_offset = QEMU_ALIGN_DOWN(offset, align);
aligned_bytes = ROUND_UP(offset + bytes, align) - aligned_offset;
{
int count; /* sectors */
int64_t longret;
assert(QEMU_IS_ALIGNED(aligned_offset | aligned_bytes,
BDRV_SECTOR_SIZE));
/*
* The contract allows us to return pnum smaller than bytes, even
* if the next query would see the same status; we truncate the
* request to avoid overflowing the driver's 32-bit interface.
*/
longret = bs->drv->bdrv_co_get_block_status(
bs, aligned_offset >> BDRV_SECTOR_BITS,
MIN(INT_MAX, aligned_bytes) >> BDRV_SECTOR_BITS, &count,
&local_file);
if (longret < 0) {
assert(INT_MIN <= longret);
ret = longret;
goto out;
}
if (longret & BDRV_BLOCK_OFFSET_VALID) {
local_map = longret & BDRV_BLOCK_OFFSET_MASK;
}
ret = longret & ~BDRV_BLOCK_OFFSET_MASK;
*pnum = count * BDRV_SECTOR_SIZE;
ret = bs->drv->bdrv_co_block_status(bs, want_zero, aligned_offset,
aligned_bytes, pnum, &local_map,
&local_file);
if (ret < 0) {
*pnum = 0;
goto out;
}
/*
* The driver's result must be a multiple of request_alignment.
* The driver's result must be a non-zero multiple of request_alignment.
* Clamp pnum and adjust map to original request.
*/
assert(QEMU_IS_ALIGNED(*pnum, align) && align > offset - aligned_offset);
assert(*pnum && QEMU_IS_ALIGNED(*pnum, align) &&
align > offset - aligned_offset);
*pnum -= offset - aligned_offset;
if (*pnum > bytes) {
*pnum = bytes;

164
block/iscsi.c
View file

@ -86,7 +86,7 @@ typedef struct IscsiLun {
unsigned long *allocmap;
unsigned long *allocmap_valid;
long allocmap_size;
int cluster_sectors;
int cluster_size;
bool use_16_for_rw;
bool write_protected;
bool lbpme;
@ -430,9 +430,10 @@ static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags)
{
iscsi_allocmap_free(iscsilun);
assert(iscsilun->cluster_size);
iscsilun->allocmap_size =
DIV_ROUND_UP(sector_lun2qemu(iscsilun->num_blocks, iscsilun),
iscsilun->cluster_sectors);
DIV_ROUND_UP(iscsilun->num_blocks * iscsilun->block_size,
iscsilun->cluster_size);
iscsilun->allocmap = bitmap_try_new(iscsilun->allocmap_size);
if (!iscsilun->allocmap) {
@ -440,7 +441,7 @@ static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags)
}
if (open_flags & BDRV_O_NOCACHE) {
/* in case that cache.direct = on all allocmap entries are
/* when cache.direct = on all allocmap entries are
* treated as invalid to force a relookup of the block
* status on every read request */
return 0;
@ -457,8 +458,8 @@ static int iscsi_allocmap_init(IscsiLun *iscsilun, int open_flags)
}
static void
iscsi_allocmap_update(IscsiLun *iscsilun, int64_t sector_num,
int nb_sectors, bool allocated, bool valid)
iscsi_allocmap_update(IscsiLun *iscsilun, int64_t offset,
int64_t bytes, bool allocated, bool valid)
{
int64_t cl_num_expanded, nb_cls_expanded, cl_num_shrunk, nb_cls_shrunk;
@ -466,13 +467,13 @@ iscsi_allocmap_update(IscsiLun *iscsilun, int64_t sector_num,
return;
}
/* expand to entirely contain all affected clusters */
cl_num_expanded = sector_num / iscsilun->cluster_sectors;
nb_cls_expanded = DIV_ROUND_UP(sector_num + nb_sectors,
iscsilun->cluster_sectors) - cl_num_expanded;
assert(iscsilun->cluster_size);
cl_num_expanded = offset / iscsilun->cluster_size;
nb_cls_expanded = DIV_ROUND_UP(offset + bytes,
iscsilun->cluster_size) - cl_num_expanded;
/* shrink to touch only completely contained clusters */
cl_num_shrunk = DIV_ROUND_UP(sector_num, iscsilun->cluster_sectors);
nb_cls_shrunk = (sector_num + nb_sectors) / iscsilun->cluster_sectors
- cl_num_shrunk;
cl_num_shrunk = DIV_ROUND_UP(offset, iscsilun->cluster_size);
nb_cls_shrunk = (offset + bytes) / iscsilun->cluster_size - cl_num_shrunk;
if (allocated) {
bitmap_set(iscsilun->allocmap, cl_num_expanded, nb_cls_expanded);
} else {
@ -495,26 +496,26 @@ iscsi_allocmap_update(IscsiLun *iscsilun, int64_t sector_num,
}
static void
iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t sector_num,
int nb_sectors)
iscsi_allocmap_set_allocated(IscsiLun *iscsilun, int64_t offset,
int64_t bytes)
{
iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, true, true);
iscsi_allocmap_update(iscsilun, offset, bytes, true, true);
}
static void
iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t sector_num,
int nb_sectors)
iscsi_allocmap_set_unallocated(IscsiLun *iscsilun, int64_t offset,
int64_t bytes)
{
/* Note: if cache.direct=on the fifth argument to iscsi_allocmap_update
* is ignored, so this will in effect be an iscsi_allocmap_set_invalid.
*/
iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, true);
iscsi_allocmap_update(iscsilun, offset, bytes, false, true);
}
static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t sector_num,
int nb_sectors)
static void iscsi_allocmap_set_invalid(IscsiLun *iscsilun, int64_t offset,
int64_t bytes)
{
iscsi_allocmap_update(iscsilun, sector_num, nb_sectors, false, false);
iscsi_allocmap_update(iscsilun, offset, bytes, false, false);
}
static void iscsi_allocmap_invalidate(IscsiLun *iscsilun)
@ -528,28 +529,30 @@ static void iscsi_allocmap_invalidate(IscsiLun *iscsilun)
}
static inline bool
iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t sector_num,
int nb_sectors)
iscsi_allocmap_is_allocated(IscsiLun *iscsilun, int64_t offset,
int64_t bytes)
{
unsigned long size;
if (iscsilun->allocmap == NULL) {
return true;
}
size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors);
assert(iscsilun->cluster_size);
size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size);
return !(find_next_bit(iscsilun->allocmap, size,
sector_num / iscsilun->cluster_sectors) == size);
offset / iscsilun->cluster_size) == size);
}
static inline bool iscsi_allocmap_is_valid(IscsiLun *iscsilun,
int64_t sector_num, int nb_sectors)
int64_t offset, int64_t bytes)
{
unsigned long size;
if (iscsilun->allocmap_valid == NULL) {
return false;
}
size = DIV_ROUND_UP(sector_num + nb_sectors, iscsilun->cluster_sectors);
assert(iscsilun->cluster_size);
size = DIV_ROUND_UP(offset + bytes, iscsilun->cluster_size);
return (find_next_zero_bit(iscsilun->allocmap_valid, size,
sector_num / iscsilun->cluster_sectors) == size);
offset / iscsilun->cluster_size) == size);
}
static int coroutine_fn
@ -631,14 +634,16 @@ retry:
}
if (iTask.status != SCSI_STATUS_GOOD) {
iscsi_allocmap_set_invalid(iscsilun, sector_num, nb_sectors);
iscsi_allocmap_set_invalid(iscsilun, sector_num * BDRV_SECTOR_SIZE,
nb_sectors * BDRV_SECTOR_SIZE);
error_report("iSCSI WRITE10/16 failed at lba %" PRIu64 ": %s", lba,
iTask.err_str);
r = iTask.err_code;
goto out_unlock;
}
iscsi_allocmap_set_allocated(iscsilun, sector_num, nb_sectors);
iscsi_allocmap_set_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE,
nb_sectors * BDRV_SECTOR_SIZE);
out_unlock:
qemu_mutex_unlock(&iscsilun->mutex);
@ -648,36 +653,36 @@ out_unlock:
static int64_t coroutine_fn iscsi_co_get_block_status(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors, int *pnum,
BlockDriverState **file)
static int coroutine_fn iscsi_co_block_status(BlockDriverState *bs,
bool want_zero, int64_t offset,
int64_t bytes, int64_t *pnum,
int64_t *map,
BlockDriverState **file)
{
IscsiLun *iscsilun = bs->opaque;
struct scsi_get_lba_status *lbas = NULL;
struct scsi_lba_status_descriptor *lbasd = NULL;
struct IscsiTask iTask;
uint64_t lba;
int64_t ret;
int ret;
iscsi_co_init_iscsitask(iscsilun, &iTask);
if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
ret = -EINVAL;
goto out;
}
assert(QEMU_IS_ALIGNED(offset | bytes, iscsilun->block_size));
/* default to all sectors allocated */
ret = BDRV_BLOCK_DATA;
ret |= (sector_num << BDRV_SECTOR_BITS) | BDRV_BLOCK_OFFSET_VALID;
*pnum = nb_sectors;
ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
if (map) {
*map = offset;
}
*pnum = bytes;
/* LUN does not support logical block provisioning */
if (!iscsilun->lbpme) {
goto out;
}
lba = sector_qemu2lun(sector_num, iscsilun);
lba = offset / iscsilun->block_size;
qemu_mutex_lock(&iscsilun->mutex);
retry:
@ -722,12 +727,12 @@ retry:
lbasd = &lbas->descriptors[0];
if (sector_qemu2lun(sector_num, iscsilun) != lbasd->lba) {
if (lba != lbasd->lba) {
ret = -EIO;
goto out_unlock;
}
*pnum = sector_lun2qemu(lbasd->num_blocks, iscsilun);
*pnum = lbasd->num_blocks * iscsilun->block_size;
if (lbasd->provisioning == SCSI_PROVISIONING_TYPE_DEALLOCATED ||
lbasd->provisioning == SCSI_PROVISIONING_TYPE_ANCHORED) {
@ -738,13 +743,13 @@ retry:
}
if (ret & BDRV_BLOCK_ZERO) {
iscsi_allocmap_set_unallocated(iscsilun, sector_num, *pnum);
iscsi_allocmap_set_unallocated(iscsilun, offset, *pnum);
} else {
iscsi_allocmap_set_allocated(iscsilun, sector_num, *pnum);
iscsi_allocmap_set_allocated(iscsilun, offset, *pnum);
}
if (*pnum > nb_sectors) {
*pnum = nb_sectors;
if (*pnum > bytes) {
*pnum = bytes;
}
out_unlock:
qemu_mutex_unlock(&iscsilun->mutex);
@ -753,7 +758,7 @@ out:
if (iTask.task != NULL) {
scsi_free_scsi_task(iTask.task);
}
if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID) {
if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID && file) {
*file = bs;
}
return ret;
@ -780,29 +785,37 @@ static int coroutine_fn iscsi_co_readv(BlockDriverState *bs,
/* if cache.direct is off and we have a valid entry in our allocation map
* we can skip checking the block status and directly return zeroes if
* the request falls within an unallocated area */
if (iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) &&
!iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) {
if (iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE,
nb_sectors * BDRV_SECTOR_SIZE) &&
!iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE,
nb_sectors * BDRV_SECTOR_SIZE)) {
qemu_iovec_memset(iov, 0, 0x00, iov->size);
return 0;
}
if (nb_sectors >= ISCSI_CHECKALLOC_THRES &&
!iscsi_allocmap_is_valid(iscsilun, sector_num, nb_sectors) &&
!iscsi_allocmap_is_allocated(iscsilun, sector_num, nb_sectors)) {
int pnum;
BlockDriverState *file;
!iscsi_allocmap_is_valid(iscsilun, sector_num * BDRV_SECTOR_SIZE,
nb_sectors * BDRV_SECTOR_SIZE) &&
!iscsi_allocmap_is_allocated(iscsilun, sector_num * BDRV_SECTOR_SIZE,
nb_sectors * BDRV_SECTOR_SIZE)) {
int64_t pnum;
/* check the block status from the beginning of the cluster
* containing the start sector */
int64_t ret = iscsi_co_get_block_status(bs,
sector_num - sector_num % iscsilun->cluster_sectors,
BDRV_REQUEST_MAX_SECTORS, &pnum, &file);
int64_t head;
int ret;
assert(iscsilun->cluster_size);
head = (sector_num * BDRV_SECTOR_SIZE) % iscsilun->cluster_size;
ret = iscsi_co_block_status(bs, true,
sector_num * BDRV_SECTOR_SIZE - head,
BDRV_REQUEST_MAX_BYTES, &pnum, NULL, NULL);
if (ret < 0) {
return ret;
}
/* if the whole request falls into an unallocated area we can avoid
* to read and directly return zeroes instead */
* reading and directly return zeroes instead */
if (ret & BDRV_BLOCK_ZERO &&
pnum >= nb_sectors + sector_num % iscsilun->cluster_sectors) {
pnum >= nb_sectors * BDRV_SECTOR_SIZE + head) {
qemu_iovec_memset(iov, 0, 0x00, iov->size);
return 0;
}
@ -1146,8 +1159,7 @@ retry:
goto retry;
}
iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS,
bytes >> BDRV_SECTOR_BITS);
iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
if (iTask.status == SCSI_STATUS_CHECK_CONDITION) {
/* the target might fail with a check condition if it
@ -1260,8 +1272,7 @@ retry:
}
if (iTask.status != SCSI_STATUS_GOOD) {
iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS,
bytes >> BDRV_SECTOR_BITS);
iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
error_report("iSCSI WRITESAME10/16 failed at lba %" PRIu64 ": %s",
lba, iTask.err_str);
r = iTask.err_code;
@ -1269,11 +1280,9 @@ retry:
}
if (flags & BDRV_REQ_MAY_UNMAP) {
iscsi_allocmap_set_invalid(iscsilun, offset >> BDRV_SECTOR_BITS,
bytes >> BDRV_SECTOR_BITS);
iscsi_allocmap_set_invalid(iscsilun, offset, bytes);
} else {
iscsi_allocmap_set_allocated(iscsilun, offset >> BDRV_SECTOR_BITS,
bytes >> BDRV_SECTOR_BITS);
iscsi_allocmap_set_allocated(iscsilun, offset, bytes);
}
out_unlock:
@ -1953,8 +1962,8 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
* reasonable size */
if (iscsilun->bl.opt_unmap_gran * iscsilun->block_size >= 4 * 1024 &&
iscsilun->bl.opt_unmap_gran * iscsilun->block_size <= 16 * 1024 * 1024) {
iscsilun->cluster_sectors = (iscsilun->bl.opt_unmap_gran *
iscsilun->block_size) >> BDRV_SECTOR_BITS;
iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran *
iscsilun->block_size;
if (iscsilun->lbprz) {
ret = iscsi_allocmap_init(iscsilun, bs->open_flags);
}
@ -2108,7 +2117,8 @@ static int iscsi_truncate(BlockDriverState *bs, int64_t offset,
return 0;
}
static int iscsi_create(const char *filename, QemuOpts *opts, Error **errp)
static int coroutine_fn iscsi_co_create_opts(const char *filename, QemuOpts *opts,
Error **errp)
{
int ret = 0;
int64_t total_size = 0;
@ -2163,7 +2173,7 @@ static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
{
IscsiLun *iscsilun = bs->opaque;
bdi->unallocated_blocks_are_zero = iscsilun->lbprz;
bdi->cluster_size = iscsilun->cluster_sectors * BDRV_SECTOR_SIZE;
bdi->cluster_size = iscsilun->cluster_size;
return 0;
}
@ -2195,7 +2205,7 @@ static BlockDriver bdrv_iscsi = {
.bdrv_parse_filename = iscsi_parse_filename,
.bdrv_file_open = iscsi_open,
.bdrv_close = iscsi_close,
.bdrv_create = iscsi_create,
.bdrv_co_create_opts = iscsi_co_create_opts,
.create_opts = &iscsi_create_opts,
.bdrv_reopen_prepare = iscsi_reopen_prepare,
.bdrv_reopen_commit = iscsi_reopen_commit,
@ -2206,7 +2216,7 @@ static BlockDriver bdrv_iscsi = {
.bdrv_truncate = iscsi_truncate,
.bdrv_refresh_limits = iscsi_refresh_limits,
.bdrv_co_get_block_status = iscsi_co_get_block_status,
.bdrv_co_block_status = iscsi_co_block_status,
.bdrv_co_pdiscard = iscsi_co_pdiscard,
.bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
.bdrv_co_readv = iscsi_co_readv,
@ -2230,7 +2240,7 @@ static BlockDriver bdrv_iser = {
.bdrv_parse_filename = iscsi_parse_filename,
.bdrv_file_open = iscsi_open,
.bdrv_close = iscsi_close,
.bdrv_create = iscsi_create,
.bdrv_co_create_opts = iscsi_co_create_opts,
.create_opts = &iscsi_create_opts,
.bdrv_reopen_prepare = iscsi_reopen_prepare,
.bdrv_reopen_commit = iscsi_reopen_commit,
@ -2241,7 +2251,7 @@ static BlockDriver bdrv_iser = {
.bdrv_truncate = iscsi_truncate,
.bdrv_refresh_limits = iscsi_refresh_limits,
.bdrv_co_get_block_status = iscsi_co_get_block_status,
.bdrv_co_block_status = iscsi_co_block_status,
.bdrv_co_pdiscard = iscsi_co_pdiscard,
.bdrv_co_pwrite_zeroes = iscsi_co_pwrite_zeroes,
.bdrv_co_readv = iscsi_co_readv,

2
block/mirror.c
View file

@ -1094,7 +1094,7 @@ static BlockDriver bdrv_mirror_top = {
.bdrv_co_pwrite_zeroes = bdrv_mirror_top_pwrite_zeroes,
.bdrv_co_pdiscard = bdrv_mirror_top_pdiscard,
.bdrv_co_flush = bdrv_mirror_top_flush,
.bdrv_co_get_block_status = bdrv_co_get_block_status_from_backing,
.bdrv_co_block_status = bdrv_co_block_status_from_backing,
.bdrv_refresh_filename = bdrv_mirror_top_refresh_filename,
.bdrv_close = bdrv_mirror_top_close,
.bdrv_child_perm = bdrv_mirror_top_child_perm,

5
block/nfs.c
View file

@ -684,7 +684,8 @@ static QemuOptsList nfs_create_opts = {
}
};
static int nfs_file_create(const char *url, QemuOpts *opts, Error **errp)
static int coroutine_fn nfs_file_co_create_opts(const char *url, QemuOpts *opts,
Error **errp)
{
int64_t ret, total_size;
NFSClient *client = g_new0(NFSClient, 1);
@ -897,7 +898,7 @@ static BlockDriver bdrv_nfs = {
.bdrv_file_open = nfs_file_open,
.bdrv_close = nfs_file_close,
.bdrv_create = nfs_file_create,
.bdrv_co_create_opts = nfs_file_co_create_opts,
.bdrv_reopen_prepare = nfs_reopen_prepare,
.bdrv_co_preadv = nfs_co_preadv,

23
block/null.c
View file

@ -223,22 +223,23 @@ static int null_reopen_prepare(BDRVReopenState *reopen_state,
return 0;
}
static int64_t coroutine_fn null_co_get_block_status(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors, int *pnum,
BlockDriverState **file)
static int coroutine_fn null_co_block_status(BlockDriverState *bs,
bool want_zero, int64_t offset,
int64_t bytes, int64_t *pnum,
int64_t *map,
BlockDriverState **file)
{
BDRVNullState *s = bs->opaque;
off_t start = sector_num * BDRV_SECTOR_SIZE;
int ret = BDRV_BLOCK_OFFSET_VALID;
*pnum = nb_sectors;
*pnum = bytes;
*map = offset;
*file = bs;
if (s->read_zeroes) {
return BDRV_BLOCK_OFFSET_VALID | start | BDRV_BLOCK_ZERO;
} else {
return BDRV_BLOCK_OFFSET_VALID | start;
ret |= BDRV_BLOCK_ZERO;
}
return ret;
}
static void null_refresh_filename(BlockDriverState *bs, QDict *opts)
@ -270,7 +271,7 @@ static BlockDriver bdrv_null_co = {
.bdrv_co_flush_to_disk = null_co_flush,
.bdrv_reopen_prepare = null_reopen_prepare,
.bdrv_co_get_block_status = null_co_get_block_status,
.bdrv_co_block_status = null_co_block_status,
.bdrv_refresh_filename = null_refresh_filename,
};
@ -290,7 +291,7 @@ static BlockDriver bdrv_null_aio = {
.bdrv_aio_flush = null_aio_flush,
.bdrv_reopen_prepare = null_reopen_prepare,
.bdrv_co_get_block_status = null_co_get_block_status,
.bdrv_co_block_status = null_co_block_status,
.bdrv_refresh_filename = null_refresh_filename,
};

14
block/nvme.c
View file

@ -1072,18 +1072,6 @@ static int nvme_reopen_prepare(BDRVReopenState *reopen_state,
return 0;
}
static int64_t coroutine_fn nvme_co_get_block_status(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors, int *pnum,
BlockDriverState **file)
{
*pnum = nb_sectors;
*file = bs;
return BDRV_BLOCK_ALLOCATED | BDRV_BLOCK_OFFSET_VALID |
(sector_num << BDRV_SECTOR_BITS);
}
static void nvme_refresh_filename(BlockDriverState *bs, QDict *opts)
{
QINCREF(opts);
@ -1183,8 +1171,6 @@ static BlockDriver bdrv_nvme = {
.bdrv_co_flush_to_disk = nvme_co_flush,
.bdrv_reopen_prepare = nvme_reopen_prepare,
.bdrv_co_get_block_status = nvme_co_get_block_status,
.bdrv_refresh_filename = nvme_refresh_filename,
.bdrv_refresh_limits = nvme_refresh_limits,

28
block/parallels.c
View file

@ -261,23 +261,31 @@ static coroutine_fn int parallels_co_flush_to_os(BlockDriverState *bs)
}
static int64_t coroutine_fn parallels_co_get_block_status(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file)
static int coroutine_fn parallels_co_block_status(BlockDriverState *bs,
bool want_zero,
int64_t offset,
int64_t bytes,
int64_t *pnum,
int64_t *map,
BlockDriverState **file)
{
BDRVParallelsState *s = bs->opaque;
int64_t offset;
int count;
assert(QEMU_IS_ALIGNED(offset | bytes, BDRV_SECTOR_SIZE));
qemu_co_mutex_lock(&s->lock);
offset = block_status(s, sector_num, nb_sectors, pnum);
offset = block_status(s, offset >> BDRV_SECTOR_BITS,
bytes >> BDRV_SECTOR_BITS, &count);
qemu_co_mutex_unlock(&s->lock);
*pnum = count * BDRV_SECTOR_SIZE;
if (offset < 0) {
return 0;
}
*map = offset * BDRV_SECTOR_SIZE;
*file = bs->file->bs;
return (offset << BDRV_SECTOR_BITS) |
BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
}
static coroutine_fn int parallels_co_writev(BlockDriverState *bs,
@ -467,7 +475,9 @@ static int parallels_check(BlockDriverState *bs, BdrvCheckResult *res,
}
static int parallels_create(const char *filename, QemuOpts *opts, Error **errp)
static int coroutine_fn parallels_co_create_opts(const char *filename,
QemuOpts *opts,
Error **errp)
{
int64_t total_size, cl_size;
uint8_t tmp[BDRV_SECTOR_SIZE];
@ -782,13 +792,13 @@ static BlockDriver bdrv_parallels = {
.bdrv_open = parallels_open,
.bdrv_close = parallels_close,
.bdrv_child_perm = bdrv_format_default_perms,
.bdrv_co_get_block_status = parallels_co_get_block_status,
.bdrv_co_block_status = parallels_co_block_status,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_co_flush_to_os = parallels_co_flush_to_os,
.bdrv_co_readv = parallels_co_readv,
.bdrv_co_writev = parallels_co_writev,
.supports_backing = true,
.bdrv_create = parallels_create,
.bdrv_co_create_opts = parallels_co_create_opts,
.bdrv_check = parallels_check,
.create_opts = &parallels_create_opts,
};

32
block/qcow.c
View file

@ -524,23 +524,28 @@ static int get_cluster_offset(BlockDriverState *bs,
return 1;
}
static int64_t coroutine_fn qcow_co_get_block_status(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file)
static int coroutine_fn qcow_co_block_status(BlockDriverState *bs,
bool want_zero,
int64_t offset, int64_t bytes,
int64_t *pnum, int64_t *map,
BlockDriverState **file)
{
BDRVQcowState *s = bs->opaque;
int index_in_cluster, n, ret;
int index_in_cluster, ret;
int64_t n;
uint64_t cluster_offset;
qemu_co_mutex_lock(&s->lock);
ret = get_cluster_offset(bs, sector_num << 9, 0, 0, 0, 0, &cluster_offset);
ret = get_cluster_offset(bs, offset, 0, 0, 0, 0, &cluster_offset);
qemu_co_mutex_unlock(&s->lock);
if (ret < 0) {
return ret;
}
index_in_cluster = sector_num & (s->cluster_sectors - 1);
n = s->cluster_sectors - index_in_cluster;
if (n > nb_sectors)
n = nb_sectors;
index_in_cluster = offset & (s->cluster_size - 1);
n = s->cluster_size - index_in_cluster;
if (n > bytes) {
n = bytes;
}
*pnum = n;
if (!cluster_offset) {
return 0;
@ -548,9 +553,9 @@ static int64_t coroutine_fn qcow_co_get_block_status(BlockDriverState *bs,
if ((cluster_offset & QCOW_OFLAG_COMPRESSED) || s->crypto) {
return BDRV_BLOCK_DATA;
}
cluster_offset |= (index_in_cluster << BDRV_SECTOR_BITS);
*map = cluster_offset | index_in_cluster;
*file = bs->file->bs;
return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | cluster_offset;
return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
}
static int decompress_buffer(uint8_t *out_buf, int out_buf_size,
@ -805,7 +810,8 @@ static void qcow_close(BlockDriverState *bs)
error_free(s->migration_blocker);
}
static int qcow_create(const char *filename, QemuOpts *opts, Error **errp)
static int coroutine_fn qcow_co_create_opts(const char *filename, QemuOpts *opts,
Error **errp)
{
int header_size, backing_filename_len, l1_size, shift, i;
QCowHeader header;
@ -1122,13 +1128,13 @@ static BlockDriver bdrv_qcow = {
.bdrv_close = qcow_close,
.bdrv_child_perm = bdrv_format_default_perms,
.bdrv_reopen_prepare = qcow_reopen_prepare,
.bdrv_create = qcow_create,
.bdrv_co_create_opts = qcow_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.supports_backing = true,
.bdrv_co_readv = qcow_co_readv,
.bdrv_co_writev = qcow_co_writev,
.bdrv_co_get_block_status = qcow_co_get_block_status,
.bdrv_co_block_status = qcow_co_block_status,
.bdrv_make_empty = qcow_make_empty,
.bdrv_co_pwritev_compressed = qcow_co_pwritev_compressed,

4
block/qcow2-bitmap.c
View file

@ -413,8 +413,8 @@ static inline void bitmap_dir_entry_to_be(Qcow2BitmapDirEntry *entry)
static inline int calc_dir_entry_size(size_t name_size, size_t extra_data_size)
{
return align_offset(sizeof(Qcow2BitmapDirEntry) +
name_size + extra_data_size, 8);
int size = sizeof(Qcow2BitmapDirEntry) + name_size + extra_data_size;
return ROUND_UP(size, 8);
}
static inline int dir_entry_size(Qcow2BitmapDirEntry *entry)

4
block/qcow2-cluster.c
View file

@ -126,11 +126,11 @@ int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size,
new_l1_size2 = sizeof(uint64_t) * new_l1_size;
new_l1_table = qemu_try_blockalign(bs->file->bs,
align_offset(new_l1_size2, 512));
ROUND_UP(new_l1_size2, 512));
if (new_l1_table == NULL) {
return -ENOMEM;
}
memset(new_l1_table, 0, align_offset(new_l1_size2, 512));
memset(new_l1_table, 0, ROUND_UP(new_l1_size2, 512));
if (s->l1_size) {
memcpy(new_l1_table, s->l1_table, s->l1_size * sizeof(uint64_t));

4
block/qcow2-refcount.c
View file

@ -1204,7 +1204,7 @@ int qcow2_update_snapshot_refcount(BlockDriverState *bs,
* l1_table_offset when it is the current s->l1_table_offset! Be careful
* when changing this! */
if (l1_table_offset != s->l1_table_offset) {
l1_table = g_try_malloc0(align_offset(l1_size2, 512));
l1_table = g_try_malloc0(ROUND_UP(l1_size2, 512));
if (l1_size2 && l1_table == NULL) {
ret = -ENOMEM;
goto fail;
@ -2553,7 +2553,7 @@ int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset,
}
/* align range to test to cluster boundaries */
size = align_offset(offset_into_cluster(s, offset) + size, s->cluster_size);
size = ROUND_UP(offset_into_cluster(s, offset) + size, s->cluster_size);
offset = start_of_cluster(s, offset);
if ((chk & QCOW2_OL_ACTIVE_L1) && s->l1_size) {

10
block/qcow2-snapshot.c
View file

@ -66,7 +66,7 @@ int qcow2_read_snapshots(BlockDriverState *bs)
for(i = 0; i < s->nb_snapshots; i++) {
/* Read statically sized part of the snapshot header */
offset = align_offset(offset, 8);
offset = ROUND_UP(offset, 8);
ret = bdrv_pread(bs->file, offset, &h, sizeof(h));
if (ret < 0) {
goto fail;
@ -155,7 +155,7 @@ static int qcow2_write_snapshots(BlockDriverState *bs)
offset = 0;
for(i = 0; i < s->nb_snapshots; i++) {
sn = s->snapshots + i;
offset = align_offset(offset, 8);
offset = ROUND_UP(offset, 8);
offset += sizeof(h);
offset += sizeof(extra);
offset += strlen(sn->id_str);
@ -215,7 +215,7 @@ static int qcow2_write_snapshots(BlockDriverState *bs)
assert(id_str_size <= UINT16_MAX && name_size <= UINT16_MAX);
h.id_str_size = cpu_to_be16(id_str_size);
h.name_size = cpu_to_be16(name_size);
offset = align_offset(offset, 8);
offset = ROUND_UP(offset, 8);
ret = bdrv_pwrite(bs->file, offset, &h, sizeof(h));
if (ret < 0) {
@ -441,7 +441,7 @@ int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
/* The VM state isn't needed any more in the active L1 table; in fact, it
* hurts by causing expensive COW for the next snapshot. */
qcow2_cluster_discard(bs, qcow2_vm_state_offset(s),
align_offset(sn->vm_state_size, s->cluster_size),
ROUND_UP(sn->vm_state_size, s->cluster_size),
QCOW2_DISCARD_NEVER, false);
#ifdef DEBUG_ALLOC
@ -710,7 +710,7 @@ int qcow2_snapshot_load_tmp(BlockDriverState *bs,
}
new_l1_bytes = sn->l1_size * sizeof(uint64_t);
new_l1_table = qemu_try_blockalign(bs->file->bs,
align_offset(new_l1_bytes, 512));
ROUND_UP(new_l1_bytes, 512));
if (new_l1_table == NULL) {
return -ENOMEM;
}

60
block/qcow2.c
View file

@ -1377,7 +1377,7 @@ static int qcow2_do_open(BlockDriverState *bs, QDict *options, int flags,
if (s->l1_size > 0) {
s->l1_table = qemu_try_blockalign(bs->file->bs,
align_offset(s->l1_size * sizeof(uint64_t), 512));
ROUND_UP(s->l1_size * sizeof(uint64_t), 512));
if (s->l1_table == NULL) {
error_setg(errp, "Could not allocate L1 table");
ret = -ENOMEM;
@ -1668,32 +1668,34 @@ static void qcow2_join_options(QDict *options, QDict *old_options)
}
}
static int64_t coroutine_fn qcow2_co_get_block_status(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file)
static int coroutine_fn qcow2_co_block_status(BlockDriverState *bs,
bool want_zero,
int64_t offset, int64_t count,
int64_t *pnum, int64_t *map,
BlockDriverState **file)
{
BDRVQcow2State *s = bs->opaque;
uint64_t cluster_offset;
int index_in_cluster, ret;
unsigned int bytes;
int64_t status = 0;
int status = 0;
bytes = MIN(INT_MAX, nb_sectors * BDRV_SECTOR_SIZE);
bytes = MIN(INT_MAX, count);
qemu_co_mutex_lock(&s->lock);
ret = qcow2_get_cluster_offset(bs, sector_num << BDRV_SECTOR_BITS, &bytes,
&cluster_offset);
ret = qcow2_get_cluster_offset(bs, offset, &bytes, &cluster_offset);
qemu_co_mutex_unlock(&s->lock);
if (ret < 0) {
return ret;
}
*pnum = bytes >> BDRV_SECTOR_BITS;
*pnum = bytes;
if (cluster_offset != 0 && ret != QCOW2_CLUSTER_COMPRESSED &&
!s->crypto) {
index_in_cluster = sector_num & (s->cluster_sectors - 1);
cluster_offset |= (index_in_cluster << BDRV_SECTOR_BITS);
index_in_cluster = offset & (s->cluster_size - 1);
*map = cluster_offset | index_in_cluster;
*file = bs->file->bs;
status |= BDRV_BLOCK_OFFSET_VALID | cluster_offset;
status |= BDRV_BLOCK_OFFSET_VALID;
}
if (ret == QCOW2_CLUSTER_ZERO_PLAIN || ret == QCOW2_CLUSTER_ZERO_ALLOC) {
status |= BDRV_BLOCK_ZERO;
@ -2638,19 +2640,19 @@ static int64_t qcow2_calc_prealloc_size(int64_t total_size,
{
int64_t meta_size = 0;
uint64_t nl1e, nl2e;
int64_t aligned_total_size = align_offset(total_size, cluster_size);
int64_t aligned_total_size = ROUND_UP(total_size, cluster_size);
/* header: 1 cluster */
meta_size += cluster_size;
/* total size of L2 tables */
nl2e = aligned_total_size / cluster_size;
nl2e = align_offset(nl2e, cluster_size / sizeof(uint64_t));
nl2e = ROUND_UP(nl2e, cluster_size / sizeof(uint64_t));
meta_size += nl2e * sizeof(uint64_t);
/* total size of L1 tables */
nl1e = nl2e * sizeof(uint64_t) / cluster_size;
nl1e = align_offset(nl1e, cluster_size / sizeof(uint64_t));
nl1e = ROUND_UP(nl1e, cluster_size / sizeof(uint64_t));
meta_size += nl1e * sizeof(uint64_t);
/* total size of refcount table and blocks */
@ -2721,11 +2723,12 @@ static uint64_t qcow2_opt_get_refcount_bits_del(QemuOpts *opts, int version,
return refcount_bits;
}
static int qcow2_create2(const char *filename, int64_t total_size,
const char *backing_file, const char *backing_format,
int flags, size_t cluster_size, PreallocMode prealloc,
QemuOpts *opts, int version, int refcount_order,
const char *encryptfmt, Error **errp)
static int coroutine_fn
qcow2_co_create2(const char *filename, int64_t total_size,
const char *backing_file, const char *backing_format,
int flags, size_t cluster_size, PreallocMode prealloc,
QemuOpts *opts, int version, int refcount_order,
const char *encryptfmt, Error **errp)
{
QDict *options;
@ -2912,7 +2915,8 @@ out:
return ret;
}
static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
static int coroutine_fn qcow2_co_create_opts(const char *filename, QemuOpts *opts,
Error **errp)
{
char *backing_file = NULL;
char *backing_fmt = NULL;
@ -2993,9 +2997,9 @@ static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
refcount_order = ctz32(refcount_bits);
ret = qcow2_create2(filename, size, backing_file, backing_fmt, flags,
cluster_size, prealloc, opts, version, refcount_order,
encryptfmt, &local_err);
ret = qcow2_co_create2(filename, size, backing_file, backing_fmt, flags,
cluster_size, prealloc, opts, version, refcount_order,
encryptfmt, &local_err);
error_propagate(errp, local_err);
finish:
@ -3704,8 +3708,8 @@ static BlockMeasureInfo *qcow2_measure(QemuOpts *opts, BlockDriverState *in_bs,
has_backing_file = !!optstr;
g_free(optstr);
virtual_size = align_offset(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
cluster_size);
virtual_size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0);
virtual_size = ROUND_UP(virtual_size, cluster_size);
/* Check that virtual disk size is valid */
l2_tables = DIV_ROUND_UP(virtual_size / cluster_size,
@ -3725,7 +3729,7 @@ static BlockMeasureInfo *qcow2_measure(QemuOpts *opts, BlockDriverState *in_bs,
goto err;
}
virtual_size = align_offset(ssize, cluster_size);
virtual_size = ROUND_UP(ssize, cluster_size);
if (has_backing_file) {
/* We don't how much of the backing chain is shared by the input
@ -4348,9 +4352,9 @@ BlockDriver bdrv_qcow2 = {
.bdrv_reopen_abort = qcow2_reopen_abort,
.bdrv_join_options = qcow2_join_options,
.bdrv_child_perm = bdrv_format_default_perms,
.bdrv_create = qcow2_create,
.bdrv_co_create_opts = qcow2_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_co_get_block_status = qcow2_co_get_block_status,
.bdrv_co_block_status = qcow2_co_block_status,
.bdrv_co_preadv = qcow2_co_preadv,
.bdrv_co_pwritev = qcow2_co_pwritev,

6
block/qcow2.h
View file

@ -480,12 +480,6 @@ static inline int offset_to_l2_slice_index(BDRVQcow2State *s, int64_t offset)
return (offset >> s->cluster_bits) & (s->l2_slice_size - 1);
}
static inline int64_t align_offset(int64_t offset, int n)
{
offset = (offset + n - 1) & ~(n - 1);
return offset;
}
static inline int64_t qcow2_vm_state_offset(BDRVQcow2State *s)
{
return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);

90
block/qed.c
View file

@ -638,7 +638,9 @@ out:
return ret;
}
static int bdrv_qed_create(const char *filename, QemuOpts *opts, Error **errp)
static int coroutine_fn bdrv_qed_co_create_opts(const char *filename,
QemuOpts *opts,
Error **errp)
{
uint64_t image_size = 0;
uint32_t cluster_size = QED_DEFAULT_CLUSTER_SIZE;
@ -688,74 +690,46 @@ finish:
return ret;
}
typedef struct {
BlockDriverState *bs;
Coroutine *co;
uint64_t pos;
int64_t status;
int *pnum;
BlockDriverState **file;
} QEDIsAllocatedCB;
/* Called with table_lock held. */
static void qed_is_allocated_cb(void *opaque, int ret, uint64_t offset, size_t len)
{
QEDIsAllocatedCB *cb = opaque;
BDRVQEDState *s = cb->bs->opaque;
*cb->pnum = len / BDRV_SECTOR_SIZE;
switch (ret) {
case QED_CLUSTER_FOUND:
offset |= qed_offset_into_cluster(s, cb->pos);
cb->status = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | offset;
*cb->file = cb->bs->file->bs;
break;
case QED_CLUSTER_ZERO:
cb->status = BDRV_BLOCK_ZERO;
break;
case QED_CLUSTER_L2:
case QED_CLUSTER_L1:
cb->status = 0;
break;
default:
assert(ret < 0);
cb->status = ret;
break;
}
if (cb->co) {
aio_co_wake(cb->co);
}
}
static int64_t coroutine_fn bdrv_qed_co_get_block_status(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors, int *pnum,
static int coroutine_fn bdrv_qed_co_block_status(BlockDriverState *bs,
bool want_zero,
int64_t pos, int64_t bytes,
int64_t *pnum, int64_t *map,
BlockDriverState **file)
{
BDRVQEDState *s = bs->opaque;
size_t len = (size_t)nb_sectors * BDRV_SECTOR_SIZE;
QEDIsAllocatedCB cb = {
.bs = bs,
.pos = (uint64_t)sector_num * BDRV_SECTOR_SIZE,
.status = BDRV_BLOCK_OFFSET_MASK,
.pnum = pnum,
.file = file,
};
size_t len = MIN(bytes, SIZE_MAX);
int status;
QEDRequest request = { .l2_table = NULL };
uint64_t offset;
int ret;
qemu_co_mutex_lock(&s->table_lock);
ret = qed_find_cluster(s, &request, cb.pos, &len, &offset);
qed_is_allocated_cb(&cb, ret, offset, len);
ret = qed_find_cluster(s, &request, pos, &len, &offset);
/* The callback was invoked immediately */
assert(cb.status != BDRV_BLOCK_OFFSET_MASK);
*pnum = len;
switch (ret) {
case QED_CLUSTER_FOUND:
*map = offset | qed_offset_into_cluster(s, pos);
status = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
*file = bs->file->bs;
break;
case QED_CLUSTER_ZERO:
status = BDRV_BLOCK_ZERO;
break;
case QED_CLUSTER_L2:
case QED_CLUSTER_L1:
status = 0;
break;
default:
assert(ret < 0);
status = ret;
break;
}
qed_unref_l2_cache_entry(request.l2_table);
qemu_co_mutex_unlock(&s->table_lock);
return cb.status;
return status;
}
static BDRVQEDState *acb_to_s(QEDAIOCB *acb)
@ -1592,9 +1566,9 @@ static BlockDriver bdrv_qed = {
.bdrv_close = bdrv_qed_close,
.bdrv_reopen_prepare = bdrv_qed_reopen_prepare,
.bdrv_child_perm = bdrv_format_default_perms,
.bdrv_create = bdrv_qed_create,
.bdrv_co_create_opts = bdrv_qed_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_co_get_block_status = bdrv_qed_co_get_block_status,
.bdrv_co_block_status = bdrv_qed_co_block_status,
.bdrv_co_readv = bdrv_qed_co_readv,
.bdrv_co_writev = bdrv_qed_co_writev,
.bdrv_co_pwrite_zeroes = bdrv_qed_co_pwrite_zeroes,

21
block/raw-format.c
View file

@ -250,17 +250,17 @@ fail:
return ret;
}
static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors, int *pnum,
static int coroutine_fn raw_co_block_status(BlockDriverState *bs,
bool want_zero, int64_t offset,
int64_t bytes, int64_t *pnum,
int64_t *map,
BlockDriverState **file)
{
BDRVRawState *s = bs->opaque;
*pnum = nb_sectors;
*pnum = bytes;
*file = bs->file->bs;
sector_num += s->offset / BDRV_SECTOR_SIZE;
return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID |
(sector_num << BDRV_SECTOR_BITS);
*map = offset + s->offset;
return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID;
}
static int coroutine_fn raw_co_pwrite_zeroes(BlockDriverState *bs,
@ -396,7 +396,8 @@ static int raw_has_zero_init(BlockDriverState *bs)
return bdrv_has_zero_init(bs->file->bs);
}
static int raw_create(const char *filename, QemuOpts *opts, Error **errp)
static int coroutine_fn raw_co_create_opts(const char *filename, QemuOpts *opts,
Error **errp)
{
return bdrv_create_file(filename, opts, errp);
}
@ -491,12 +492,12 @@ BlockDriver bdrv_raw = {
.bdrv_open = &raw_open,
.bdrv_close = &raw_close,
.bdrv_child_perm = bdrv_filter_default_perms,
.bdrv_create = &raw_create,
.bdrv_co_create_opts = &raw_co_create_opts,
.bdrv_co_preadv = &raw_co_preadv,
.bdrv_co_pwritev = &raw_co_pwritev,
.bdrv_co_pwrite_zeroes = &raw_co_pwrite_zeroes,
.bdrv_co_pdiscard = &raw_co_pdiscard,
.bdrv_co_get_block_status = &raw_co_get_block_status,
.bdrv_co_block_status = &raw_co_block_status,
.bdrv_truncate = &raw_truncate,
.bdrv_getlength = &raw_getlength,
.has_variable_length = true,

6
block/rbd.c
View file

@ -351,7 +351,9 @@ static QemuOptsList runtime_opts = {
},
};
static int qemu_rbd_create(const char *filename, QemuOpts *opts, Error **errp)
static int coroutine_fn qemu_rbd_co_create_opts(const char *filename,
QemuOpts *opts,
Error **errp)
{
Error *local_err = NULL;
int64_t bytes = 0;
@ -1132,7 +1134,7 @@ static BlockDriver bdrv_rbd = {
.bdrv_file_open = qemu_rbd_open,
.bdrv_close = qemu_rbd_close,
.bdrv_reopen_prepare = qemu_rbd_reopen_prepare,
.bdrv_create = qemu_rbd_create,
.bdrv_co_create_opts = qemu_rbd_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_get_info = qemu_rbd_getinfo,
.create_opts = &qemu_rbd_create_opts,

36
block/sheepdog.c
View file

@ -1959,8 +1959,8 @@ static int parse_block_size_shift(BDRVSheepdogState *s, QemuOpts *opt)
return 0;
}
static int sd_create(const char *filename, QemuOpts *opts,
Error **errp)
static int coroutine_fn sd_co_create_opts(const char *filename, QemuOpts *opts,
Error **errp)
{
Error *err = NULL;
int ret = 0;
@ -3004,19 +3004,19 @@ static coroutine_fn int sd_co_pdiscard(BlockDriverState *bs, int64_t offset,
return acb.ret;
}
static coroutine_fn int64_t
sd_co_get_block_status(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
int *pnum, BlockDriverState **file)
static coroutine_fn int
sd_co_block_status(BlockDriverState *bs, bool want_zero, int64_t offset,
int64_t bytes, int64_t *pnum, int64_t *map,
BlockDriverState **file)
{
BDRVSheepdogState *s = bs->opaque;
SheepdogInode *inode = &s->inode;
uint32_t object_size = (UINT32_C(1) << inode->block_size_shift);
uint64_t offset = sector_num * BDRV_SECTOR_SIZE;
unsigned long start = offset / object_size,
end = DIV_ROUND_UP((sector_num + nb_sectors) *
BDRV_SECTOR_SIZE, object_size);
end = DIV_ROUND_UP(offset + bytes, object_size);
unsigned long idx;
int64_t ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | offset;
*map = offset;
int ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
for (idx = start; idx < end; idx++) {
if (inode->data_vdi_id[idx] == 0) {
@ -3033,9 +3033,9 @@ sd_co_get_block_status(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
}
}
*pnum = (idx - start) * object_size / BDRV_SECTOR_SIZE;
if (*pnum > nb_sectors) {
*pnum = nb_sectors;
*pnum = (idx - start) * object_size;
if (*pnum > bytes) {
*pnum = bytes;
}
if (ret > 0 && ret & BDRV_BLOCK_OFFSET_VALID) {
*file = bs;
@ -3103,7 +3103,7 @@ static BlockDriver bdrv_sheepdog = {
.bdrv_reopen_commit = sd_reopen_commit,
.bdrv_reopen_abort = sd_reopen_abort,
.bdrv_close = sd_close,
.bdrv_create = sd_create,
.bdrv_co_create_opts = sd_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_getlength = sd_getlength,
.bdrv_get_allocated_file_size = sd_get_allocated_file_size,
@ -3113,7 +3113,7 @@ static BlockDriver bdrv_sheepdog = {
.bdrv_co_writev = sd_co_writev,
.bdrv_co_flush_to_disk = sd_co_flush_to_disk,
.bdrv_co_pdiscard = sd_co_pdiscard,
.bdrv_co_get_block_status = sd_co_get_block_status,
.bdrv_co_block_status = sd_co_block_status,
.bdrv_snapshot_create = sd_snapshot_create,
.bdrv_snapshot_goto = sd_snapshot_goto,
@ -3139,7 +3139,7 @@ static BlockDriver bdrv_sheepdog_tcp = {
.bdrv_reopen_commit = sd_reopen_commit,
.bdrv_reopen_abort = sd_reopen_abort,
.bdrv_close = sd_close,
.bdrv_create = sd_create,
.bdrv_co_create_opts = sd_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_getlength = sd_getlength,
.bdrv_get_allocated_file_size = sd_get_allocated_file_size,
@ -3149,7 +3149,7 @@ static BlockDriver bdrv_sheepdog_tcp = {
.bdrv_co_writev = sd_co_writev,
.bdrv_co_flush_to_disk = sd_co_flush_to_disk,
.bdrv_co_pdiscard = sd_co_pdiscard,
.bdrv_co_get_block_status = sd_co_get_block_status,
.bdrv_co_block_status = sd_co_block_status,
.bdrv_snapshot_create = sd_snapshot_create,
.bdrv_snapshot_goto = sd_snapshot_goto,
@ -3175,7 +3175,7 @@ static BlockDriver bdrv_sheepdog_unix = {
.bdrv_reopen_commit = sd_reopen_commit,
.bdrv_reopen_abort = sd_reopen_abort,
.bdrv_close = sd_close,
.bdrv_create = sd_create,
.bdrv_co_create_opts = sd_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_getlength = sd_getlength,
.bdrv_get_allocated_file_size = sd_get_allocated_file_size,
@ -3185,7 +3185,7 @@ static BlockDriver bdrv_sheepdog_unix = {
.bdrv_co_writev = sd_co_writev,
.bdrv_co_flush_to_disk = sd_co_flush_to_disk,
.bdrv_co_pdiscard = sd_co_pdiscard,
.bdrv_co_get_block_status = sd_co_get_block_status,
.bdrv_co_block_status = sd_co_block_status,
.bdrv_snapshot_create = sd_snapshot_create,
.bdrv_snapshot_goto = sd_snapshot_goto,

66
block/ssh.c
View file

@ -803,6 +803,33 @@ static int ssh_file_open(BlockDriverState *bs, QDict *options, int bdrv_flags,
return ret;
}
/* Note: This is a blocking operation */
static int ssh_grow_file(BDRVSSHState *s, int64_t offset, Error **errp)
{
ssize_t ret;
char c[1] = { '\0' };
int was_blocking = libssh2_session_get_blocking(s->session);
/* offset must be strictly greater than the current size so we do
* not overwrite anything */
assert(offset > 0 && offset > s->attrs.filesize);
libssh2_session_set_blocking(s->session, 1);
libssh2_sftp_seek64(s->sftp_handle, offset - 1);
ret = libssh2_sftp_write(s->sftp_handle, c, 1);
libssh2_session_set_blocking(s->session, was_blocking);
if (ret < 0) {
sftp_error_setg(errp, s, "Failed to grow file");
return -EIO;
}
s->attrs.filesize = offset;
return 0;
}
static QemuOptsList ssh_create_opts = {
.name = "ssh-create-opts",
.head = QTAILQ_HEAD_INITIALIZER(ssh_create_opts.head),
@ -816,14 +843,13 @@ static QemuOptsList ssh_create_opts = {
}
};
static int ssh_create(const char *filename, QemuOpts *opts, Error **errp)
static int coroutine_fn ssh_co_create_opts(const char *filename, QemuOpts *opts,
Error **errp)
{
int r, ret;
int64_t total_size = 0;
QDict *uri_options = NULL;
BDRVSSHState s;
ssize_t r2;
char c[1] = { '\0' };
ssh_state_init(&s);
@ -849,14 +875,10 @@ static int ssh_create(const char *filename, QemuOpts *opts, Error **errp)
}
if (total_size > 0) {
libssh2_sftp_seek64(s.sftp_handle, total_size-1);
r2 = libssh2_sftp_write(s.sftp_handle, c, 1);
if (r2 < 0) {
sftp_error_setg(errp, &s, "truncate failed");
ret = -EINVAL;
ret = ssh_grow_file(&s, total_size, errp);
if (ret < 0) {
goto out;
}
s.attrs.filesize = total_size;
}
ret = 0;
@ -1198,18 +1220,42 @@ static int64_t ssh_getlength(BlockDriverState *bs)
return length;
}
static int ssh_truncate(BlockDriverState *bs, int64_t offset,
PreallocMode prealloc, Error **errp)
{
BDRVSSHState *s = bs->opaque;
if (prealloc != PREALLOC_MODE_OFF) {
error_setg(errp, "Unsupported preallocation mode '%s'",
PreallocMode_str(prealloc));
return -ENOTSUP;
}
if (offset < s->attrs.filesize) {
error_setg(errp, "ssh driver does not support shrinking files");
return -ENOTSUP;
}
if (offset == s->attrs.filesize) {
return 0;
}
return ssh_grow_file(s, offset, errp);
}
static BlockDriver bdrv_ssh = {
.format_name = "ssh",
.protocol_name = "ssh",
.instance_size = sizeof(BDRVSSHState),
.bdrv_parse_filename = ssh_parse_filename,
.bdrv_file_open = ssh_file_open,
.bdrv_create = ssh_create,
.bdrv_co_create_opts = ssh_co_create_opts,
.bdrv_close = ssh_close,
.bdrv_has_zero_init = ssh_has_zero_init,
.bdrv_co_readv = ssh_co_readv,
.bdrv_co_writev = ssh_co_writev,
.bdrv_getlength = ssh_getlength,
.bdrv_truncate = ssh_truncate,
.bdrv_co_flush_to_disk = ssh_co_flush,
.create_opts = &ssh_create_opts,
};

2
block/throttle.c
View file

@ -240,7 +240,7 @@ static BlockDriver bdrv_throttle = {
.bdrv_reopen_prepare = throttle_reopen_prepare,
.bdrv_reopen_commit = throttle_reopen_commit,
.bdrv_reopen_abort = throttle_reopen_abort,
.bdrv_co_get_block_status = bdrv_co_get_block_status_from_file,
.bdrv_co_block_status = bdrv_co_block_status_from_file,
.bdrv_co_drain_begin = throttle_co_drain_begin,
.bdrv_co_drain_end = throttle_co_drain_end,

50
block/vdi.c
View file

@ -87,12 +87,18 @@
#define DEFAULT_CLUSTER_SIZE (1 * MiB)
#if defined(CONFIG_VDI_DEBUG)
#define logout(fmt, ...) \
fprintf(stderr, "vdi\t%-24s" fmt, __func__, ##__VA_ARGS__)
#define VDI_DEBUG 1
#else
#define logout(fmt, ...) ((void)0)
#define VDI_DEBUG 0
#endif
#define logout(fmt, ...) \
do { \
if (VDI_DEBUG) { \
fprintf(stderr, "vdi\t%-24s" fmt, __func__, ##__VA_ARGS__); \
} \
} while (0)
/* Image signature. */
#define VDI_SIGNATURE 0xbeda107f
@ -166,8 +172,6 @@ typedef struct {
uint32_t *bmap;
/* Size of block (bytes). */
uint32_t block_size;
/* Size of block (sectors). */
uint32_t block_sectors;
/* First sector of block map. */
uint32_t bmap_sector;
/* VDI header (converted to host endianness). */
@ -457,7 +461,6 @@ static int vdi_open(BlockDriverState *bs, QDict *options, int flags,
bs->total_sectors = header.disk_size / SECTOR_SIZE;
s->block_size = header.block_size;
s->block_sectors = header.block_size / SECTOR_SIZE;
s->bmap_sector = header.offset_bmap / SECTOR_SIZE;
s->header = header;
@ -503,33 +506,29 @@ static int vdi_reopen_prepare(BDRVReopenState *state,
return 0;
}
static int64_t coroutine_fn vdi_co_get_block_status(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file)
static int coroutine_fn vdi_co_block_status(BlockDriverState *bs,
bool want_zero,
int64_t offset, int64_t bytes,
int64_t *pnum, int64_t *map,
BlockDriverState **file)
{
/* TODO: Check for too large sector_num (in bdrv_is_allocated or here). */
BDRVVdiState *s = (BDRVVdiState *)bs->opaque;
size_t bmap_index = sector_num / s->block_sectors;
size_t sector_in_block = sector_num % s->block_sectors;
int n_sectors = s->block_sectors - sector_in_block;
size_t bmap_index = offset / s->block_size;
size_t index_in_block = offset % s->block_size;
uint32_t bmap_entry = le32_to_cpu(s->bmap[bmap_index]);
uint64_t offset;
int result;
logout("%p, %" PRId64 ", %d, %p\n", bs, sector_num, nb_sectors, pnum);
if (n_sectors > nb_sectors) {
n_sectors = nb_sectors;
}
*pnum = n_sectors;
logout("%p, %" PRId64 ", %" PRId64 ", %p\n", bs, offset, bytes, pnum);
*pnum = MIN(s->block_size - index_in_block, bytes);
result = VDI_IS_ALLOCATED(bmap_entry);
if (!result) {
return 0;
}
offset = s->header.offset_data +
(uint64_t)bmap_entry * s->block_size +
sector_in_block * SECTOR_SIZE;
*map = s->header.offset_data + (uint64_t)bmap_entry * s->block_size +
index_in_block;
*file = bs->file->bs;
return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | offset;
return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
}
static int coroutine_fn
@ -717,7 +716,8 @@ nonallocating_write:
return ret;
}
static int vdi_create(const char *filename, QemuOpts *opts, Error **errp)
static int coroutine_fn vdi_co_create_opts(const char *filename, QemuOpts *opts,
Error **errp)
{
int ret = 0;
uint64_t bytes = 0;
@ -895,9 +895,9 @@ static BlockDriver bdrv_vdi = {
.bdrv_close = vdi_close,
.bdrv_reopen_prepare = vdi_reopen_prepare,
.bdrv_child_perm = bdrv_format_default_perms,
.bdrv_create = vdi_create,
.bdrv_co_create_opts = vdi_co_create_opts,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
.bdrv_co_get_block_status = vdi_co_get_block_status,
.bdrv_co_block_status = vdi_co_block_status,
.bdrv_make_empty = vdi_make_empty,
.bdrv_co_preadv = vdi_co_preadv,

5
block/vhdx.c
View file

@ -1792,7 +1792,8 @@ exit:
* .---- ~ ----------- ~ ------------ ~ ---------------- ~ -----------.
* 1MB
*/
static int vhdx_create(const char *filename, QemuOpts *opts, Error **errp)
static int coroutine_fn vhdx_co_create_opts(const char *filename, QemuOpts *opts,
Error **errp)
{
int ret = 0;
uint64_t image_size = (uint64_t) 2 * GiB;
@ -2003,7 +2004,7 @@ static BlockDriver bdrv_vhdx = {
.bdrv_child_perm = bdrv_format_default_perms,
.bdrv_co_readv = vhdx_co_readv,
.bdrv_co_writev = vhdx_co_writev,
.bdrv_create = vhdx_create,
.bdrv_co_create_opts = vhdx_co_create_opts,
.bdrv_get_info = vhdx_get_info,
.bdrv_check = vhdx_check,
.bdrv_has_zero_init = bdrv_has_zero_init_1,

43
block/vmdk.c
View file

@ -1304,33 +1304,27 @@ static inline uint64_t vmdk_find_offset_in_cluster(VmdkExtent *extent,
return extent_relative_offset % cluster_size;
}
static inline uint64_t vmdk_find_index_in_cluster(VmdkExtent *extent,
int64_t sector_num)
{
uint64_t offset;
offset = vmdk_find_offset_in_cluster(extent, sector_num * BDRV_SECTOR_SIZE);
return offset / BDRV_SECTOR_SIZE;
}
static int64_t coroutine_fn vmdk_co_get_block_status(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file)
static int coroutine_fn vmdk_co_block_status(BlockDriverState *bs,
bool want_zero,
int64_t offset, int64_t bytes,
int64_t *pnum, int64_t *map,
BlockDriverState **file)
{
BDRVVmdkState *s = bs->opaque;
int64_t index_in_cluster, n, ret;
uint64_t offset;
uint64_t cluster_offset;
VmdkExtent *extent;
extent = find_extent(s, sector_num, NULL);
extent = find_extent(s, offset >> BDRV_SECTOR_BITS, NULL);
if (!extent) {
return 0;
return -EIO;
}
qemu_co_mutex_lock(&s->lock);
ret = get_cluster_offset(bs, extent, NULL,
sector_num * 512, false, &offset,
ret = get_cluster_offset(bs, extent, NULL, offset, false, &cluster_offset,
0, 0);
qemu_co_mutex_unlock(&s->lock);
index_in_cluster = vmdk_find_index_in_cluster(extent, sector_num);
index_in_cluster = vmdk_find_offset_in_cluster(extent, offset);
switch (ret) {
case VMDK_ERROR:
ret = -EIO;
@ -1345,18 +1339,14 @@ static int64_t coroutine_fn vmdk_co_get_block_status(BlockDriverState *bs,
ret = BDRV_BLOCK_DATA;
if (!extent->compressed) {
ret |= BDRV_BLOCK_OFFSET_VALID;
ret |= (offset + (index_in_cluster << BDRV_SECTOR_BITS))
& BDRV_BLOCK_OFFSET_MASK;
*map = cluster_offset + index_in_cluster;
}
*file = extent->file->bs;
break;
}
n = extent->cluster_sectors - index_in_cluster;
if (n > nb_sectors) {
n = nb_sectors;
}
*pnum = n;
n = extent->cluster_sectors * BDRV_SECTOR_SIZE - index_in_cluster;
*pnum = MIN(n, bytes);
return ret;
}
@ -1892,7 +1882,8 @@ static int filename_decompose(const char *filename, char *path, char *prefix,
return VMDK_OK;
}
static int vmdk_create(const char *filename, QemuOpts *opts, Error **errp)
static int coroutine_fn vmdk_co_create_opts(const char *filename, QemuOpts *opts,
Error **errp)
{
int idx = 0;
BlockBackend *new_blk = NULL;
@ -2408,9 +2399,9 @@ static BlockDriver bdrv_vmdk = {
.bdrv_co_pwritev_compressed = vmdk_co_pwritev_compressed,
.bdrv_co_pwrite_zeroes = vmdk_co_pwrite_zeroes,
.bdrv_close = vmdk_close,
.bdrv_create = vmdk_create,
.bdrv_co_create_opts = vmdk_co_create_opts,
.bdrv_co_flush_to_disk = vmdk_co_flush,
.bdrv_co_get_block_status = vmdk_co_get_block_status,
.bdrv_co_block_status = vmdk_co_block_status,
.bdrv_get_allocated_file_size = vmdk_get_allocated_file_size,
.bdrv_has_zero_init = vmdk_has_zero_init,
.bdrv_get_specific_info = vmdk_get_specific_info,

50
block/vpc.c
View file

@ -706,53 +706,54 @@ fail:
return ret;
}
static int64_t coroutine_fn vpc_co_get_block_status(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, int *pnum, BlockDriverState **file)
static int coroutine_fn vpc_co_block_status(BlockDriverState *bs,
bool want_zero,
int64_t offset, int64_t bytes,
int64_t *pnum, int64_t *map,
BlockDriverState **file)
{
BDRVVPCState *s = bs->opaque;
VHDFooter *footer = (VHDFooter*) s->footer_buf;
int64_t start, offset;
int64_t image_offset;
bool allocated;
int64_t ret;
int n;
int ret;
int64_t n;
if (be32_to_cpu(footer->type) == VHD_FIXED) {
*pnum = nb_sectors;
*pnum = bytes;
*map = offset;
*file = bs->file->bs;
return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID |
(sector_num << BDRV_SECTOR_BITS);
return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID;
}
qemu_co_mutex_lock(&s->lock);
offset = get_image_offset(bs, sector_num << BDRV_SECTOR_BITS, false, NULL);
start = offset;
allocated = (offset != -1);
image_offset = get_image_offset(bs, offset, false, NULL);
allocated = (image_offset != -1);
*pnum = 0;
ret = 0;
do {
/* All sectors in a block are contiguous (without using the bitmap) */
n = ROUND_UP(sector_num + 1, s->block_size / BDRV_SECTOR_SIZE)
- sector_num;
n = MIN(n, nb_sectors);
n = ROUND_UP(offset + 1, s->block_size) - offset;
n = MIN(n, bytes);
*pnum += n;
sector_num += n;
nb_sectors -= n;
offset += n;
bytes -= n;
/* *pnum can't be greater than one block for allocated
* sectors since there is always a bitmap in between. */
if (allocated) {
*file = bs->file->bs;
ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
*map = image_offset;
ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
break;
}
if (nb_sectors == 0) {
if (bytes == 0) {
break;
}
offset = get_image_offset(bs, sector_num << BDRV_SECTOR_BITS, false,
NULL);
} while (offset == -1);
image_offset = get_image_offset(bs, offset, false, NULL);
} while (image_offset == -1);
qemu_co_mutex_unlock(&s->lock);
return ret;
@ -896,7 +897,8 @@ static int create_fixed_disk(BlockBackend *blk, uint8_t *buf,
return ret;
}
static int vpc_create(const char *filename, QemuOpts *opts, Error **errp)
static int coroutine_fn vpc_co_create_opts(const char *filename, QemuOpts *opts,
Error **errp)
{
uint8_t buf[1024];
VHDFooter *footer = (VHDFooter *) buf;
@ -1094,11 +1096,11 @@ static BlockDriver bdrv_vpc = {
.bdrv_close = vpc_close,
.bdrv_reopen_prepare = vpc_reopen_prepare,
.bdrv_child_perm = bdrv_format_default_perms,
.bdrv_create = vpc_create,
.bdrv_co_create_opts = vpc_co_create_opts,
.bdrv_co_preadv = vpc_co_preadv,
.bdrv_co_pwritev = vpc_co_pwritev,
.bdrv_co_get_block_status = vpc_co_get_block_status,
.bdrv_co_block_status = vpc_co_block_status,
.bdrv_get_info = vpc_get_info,

16
block/vvfat.c
View file

@ -3088,15 +3088,13 @@ vvfat_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
return ret;
}
static int64_t coroutine_fn vvfat_co_get_block_status(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, int *n, BlockDriverState **file)
static int coroutine_fn vvfat_co_block_status(BlockDriverState *bs,
bool want_zero, int64_t offset,
int64_t bytes, int64_t *n,
int64_t *map,
BlockDriverState **file)
{
*n = bs->total_sectors - sector_num;
if (*n > nb_sectors) {
*n = nb_sectors;
} else if (*n < 0) {
return 0;
}
*n = bytes;
return BDRV_BLOCK_DATA;
}
@ -3257,7 +3255,7 @@ static BlockDriver bdrv_vvfat = {
.bdrv_co_preadv = vvfat_co_preadv,
.bdrv_co_pwritev = vvfat_co_pwritev,
.bdrv_co_get_block_status = vvfat_co_get_block_status,
.bdrv_co_block_status = vvfat_co_block_status,
};
static void bdrv_vvfat_init(void)

16
docs/interop/qcow2.txt
View file

@ -426,10 +426,20 @@ Standard Cluster Descriptor:
Compressed Clusters Descriptor (x = 62 - (cluster_bits - 8)):
Bit 0 - x: Host cluster offset. This is usually _not_ aligned to a
cluster boundary!
Bit 0 - x-1: Host cluster offset. This is usually _not_ aligned to a
cluster or sector boundary!
x+1 - 61: Compressed size of the images in sectors of 512 bytes
x - 61: Number of additional 512-byte sectors used for the
compressed data, beyond the sector containing the offset
in the previous field. Some of these sectors may reside
in the next contiguous host cluster.
Note that the compressed data does not necessarily occupy
all of the bytes in the final sector; rather, decompression
stops when it has produced a cluster of data.
Another compressed cluster may map to the tail of the final
sector used by this compressed cluster.
If a cluster is unallocated, read requests shall read the data from the backing
file (except if bit 0 in the Standard Cluster Descriptor is set). If there is

46
docs/qcow2-cache.txt
View file

@ -1,6 +1,6 @@
qcow2 L2/refcount cache configuration
=====================================
Copyright (C) 2015 Igalia, S.L.
Copyright (C) 2015, 2018 Igalia, S.L.
Author: Alberto Garcia <berto@igalia.com>
This work is licensed under the terms of the GNU GPL, version 2 or
@ -118,8 +118,8 @@ There are three options available, and all of them take bytes:
There are two things that need to be taken into account:
- Both caches must have a size that is a multiple of the cluster
size.
- Both caches must have a size that is a multiple of the cluster size
(or the cache entry size: see "Using smaller cache sizes" below).
- If you only set one of the options above, QEMU will automatically
adjust the others so that the L2 cache is 4 times bigger than the
@ -143,6 +143,46 @@ much less often than the L2 cache, so it's perfectly reasonable to
keep it small.
Using smaller cache entries
---------------------------
The qcow2 L2 cache stores complete tables by default. This means that
if QEMU needs an entry from an L2 table then the whole table is read
from disk and is kept in the cache. If the cache is full then a
complete table needs to be evicted first.
This can be inefficient with large cluster sizes since it results in
more disk I/O and wastes more cache memory.
Since QEMU 2.12 you can change the size of the L2 cache entry and make
it smaller than the cluster size. This can be configured using the
"l2-cache-entry-size" parameter:
-drive file=hd.qcow2,l2-cache-size=2097152,l2-cache-entry-size=4096
Some things to take into account:
- The L2 cache entry size has the same restrictions as the cluster
size (power of two, at least 512 bytes).
- Smaller entry sizes generally improve the cache efficiency and make
disk I/O faster. This is particularly true with solid state drives
so it's a good idea to reduce the entry size in those cases. With
rotating hard drives the situation is a bit more complicated so you
should test it first and stay with the default size if unsure.
- Try different entry sizes to see which one gives faster performance
in your case. The block size of the host filesystem is generally a
good default (usually 4096 bytes in the case of ext4).
- Only the L2 cache can be configured this way. The refcount cache
always uses the cluster size as the entry size.
- If the L2 cache is big enough to hold all of the image's L2 tables
(as explained in the "Choosing the right cache sizes" section
earlier in this document) then none of this is necessary and you
can omit the "l2-cache-entry-size" parameter altogether.
Reducing the memory usage
-------------------------
It is possible to clean unused cache entries in order to reduce the

10
hw/ide/core.c
View file

@ -1087,15 +1087,7 @@ static void ide_flush_cache(IDEState *s)
s->status |= BUSY_STAT;
ide_set_retry(s);
block_acct_start(blk_get_stats(s->blk), &s->acct, 0, BLOCK_ACCT_FLUSH);
if (blk_bs(s->blk)) {
s->pio_aiocb = blk_aio_flush(s->blk, ide_flush_cb, s);
} else {
/* XXX blk_aio_flush() crashes when blk_bs(blk) is NULL, remove this
* temporary workaround when blk_aio_*() functions handle NULL blk_bs.
*/
ide_flush_cb(s, 0);
}
s->pio_aiocb = blk_aio_flush(s->blk, ide_flush_cb, s);
}
static void ide_cfata_metadata_inquiry(IDEState *s)

116
include/block/aio-wait.h Normal file
View file

@ -0,0 +1,116 @@
/*
* AioContext wait support
*
* Copyright (C) 2018 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef QEMU_AIO_WAIT_H
#define QEMU_AIO_WAIT_H
#include "block/aio.h"
/**
* AioWait:
*
* An object that facilitates synchronous waiting on a condition. The main
* loop can wait on an operation running in an IOThread as follows:
*
* AioWait *wait = ...;
* AioContext *ctx = ...;
* MyWork work = { .done = false };
* schedule_my_work_in_iothread(ctx, &work);
* AIO_WAIT_WHILE(wait, ctx, !work.done);
*
* The IOThread must call aio_wait_kick() to notify the main loop when
* work.done changes:
*
* static void do_work(...)
* {
* ...
* work.done = true;
* aio_wait_kick(wait);
* }
*/
typedef struct {
/* Is the main loop waiting for a kick? Accessed with atomic ops. */
bool need_kick;
} AioWait;
/**
* AIO_WAIT_WHILE:
* @wait: the aio wait object
* @ctx: the aio context
* @cond: wait while this conditional expression is true
*
* Wait while a condition is true. Use this to implement synchronous
* operations that require event loop activity.
*
* The caller must be sure that something calls aio_wait_kick() when the value
* of @cond might have changed.
*
* The caller's thread must be the IOThread that owns @ctx or the main loop
* thread (with @ctx acquired exactly once). This function cannot be used to
* wait on conditions between two IOThreads since that could lead to deadlock,
* go via the main loop instead.
*/
#define AIO_WAIT_WHILE(wait, ctx, cond) ({ \
bool waited_ = false; \
bool busy_ = true; \
AioWait *wait_ = (wait); \
AioContext *ctx_ = (ctx); \
if (in_aio_context_home_thread(ctx_)) { \
while ((cond) || busy_) { \
busy_ = aio_poll(ctx_, (cond)); \
waited_ |= !!(cond) | busy_; \
} \
} else { \
assert(qemu_get_current_aio_context() == \
qemu_get_aio_context()); \
assert(!wait_->need_kick); \
/* Set wait_->need_kick before evaluating cond. */ \
atomic_mb_set(&wait_->need_kick, true); \
while (busy_) { \
if ((cond)) { \
waited_ = busy_ = true; \
aio_context_release(ctx_); \
aio_poll(qemu_get_aio_context(), true); \
aio_context_acquire(ctx_); \
} else { \
busy_ = aio_poll(ctx_, false); \
waited_ |= busy_; \
} \
} \
atomic_set(&wait_->need_kick, false); \
} \
waited_; })
/**
* aio_wait_kick:
* @wait: the aio wait object that should re-evaluate its condition
*
* Wake up the main thread if it is waiting on AIO_WAIT_WHILE(). During
* synchronous operations performed in an IOThread, the main thread lets the
* IOThread's event loop run, waiting for the operation to complete. A
* aio_wait_kick() call will wake up the main thread.
*/
void aio_wait_kick(AioWait *wait);
#endif /* QEMU_AIO_WAIT */

7
include/block/aio.h
View file

@ -534,11 +534,14 @@ void aio_co_enter(AioContext *ctx, struct Coroutine *co);
AioContext *qemu_get_current_aio_context(void);
/**
* in_aio_context_home_thread:
* @ctx: the aio context
*
* Return whether we are running in the I/O thread that manages @ctx.
* Return whether we are running in the thread that normally runs @ctx. Note
* that acquiring/releasing ctx does not affect the outcome, each AioContext
* still only has one home thread that is responsible for running it.
*/
static inline bool aio_context_in_iothread(AioContext *ctx)
static inline bool in_aio_context_home_thread(AioContext *ctx)
{
return ctx == qemu_get_current_aio_context();
}

54
include/block/block.h
View file

@ -3,6 +3,7 @@
#include "block/aio.h"
#include "qapi/qapi-types-block-core.h"
#include "block/aio-wait.h"
#include "qemu/iov.h"
#include "qemu/coroutine.h"
#include "block/accounting.h"
@ -115,19 +116,19 @@ typedef struct HDGeometry {
* BDRV_BLOCK_ZERO: offset reads as zero
* BDRV_BLOCK_OFFSET_VALID: an associated offset exists for accessing raw data
* BDRV_BLOCK_ALLOCATED: the content of the block is determined by this
* layer (short for DATA || ZERO), set by block layer
* BDRV_BLOCK_EOF: the returned pnum covers through end of file for this layer
* layer rather than any backing, set by block layer
* BDRV_BLOCK_EOF: the returned pnum covers through end of file for this
* layer, set by block layer
*
* Internal flag:
* BDRV_BLOCK_RAW: for use by passthrough drivers, such as raw, to request
* that the block layer recompute the answer from the returned
* BDS; must be accompanied by just BDRV_BLOCK_OFFSET_VALID.
*
* If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 (BDRV_BLOCK_OFFSET_MASK) of
* the return value (old interface) or the entire map parameter (new
* interface) represent the offset in the returned BDS that is allocated for
* the corresponding raw data. However, whether that offset actually
* contains data also depends on BDRV_BLOCK_DATA, as follows:
* If BDRV_BLOCK_OFFSET_VALID is set, the map parameter represents the
* host offset within the returned BDS that is allocated for the
* corresponding raw guest data. However, whether that offset
* actually contains data also depends on BDRV_BLOCK_DATA, as follows:
*
* DATA ZERO OFFSET_VALID
* t t t sectors read as zero, returned file is zero at offset
@ -367,41 +368,14 @@ void bdrv_drain_all_begin(void);
void bdrv_drain_all_end(void);
void bdrv_drain_all(void);
/* Returns NULL when bs == NULL */
AioWait *bdrv_get_aio_wait(BlockDriverState *bs);
#define BDRV_POLL_WHILE(bs, cond) ({ \
bool waited_ = false; \
bool busy_ = true; \
BlockDriverState *bs_ = (bs); \
AioContext *ctx_ = bdrv_get_aio_context(bs_); \
if (aio_context_in_iothread(ctx_)) { \
while ((cond) || busy_) { \
busy_ = aio_poll(ctx_, (cond)); \
waited_ |= !!(cond) | busy_; \
} \
} else { \
assert(qemu_get_current_aio_context() == \
qemu_get_aio_context()); \
/* Ask bdrv_dec_in_flight to wake up the main \
* QEMU AioContext. Extra I/O threads never take \
* other I/O threads' AioContexts (see for example \
* block_job_defer_to_main_loop for how to do it). \
*/ \
assert(!bs_->wakeup); \
/* Set bs->wakeup before evaluating cond. */ \
atomic_mb_set(&bs_->wakeup, true); \
while (busy_) { \
if ((cond)) { \
waited_ = busy_ = true; \
aio_context_release(ctx_); \
aio_poll(qemu_get_aio_context(), true); \
aio_context_acquire(ctx_); \
} else { \
busy_ = aio_poll(ctx_, false); \
waited_ |= busy_; \
} \
} \
atomic_set(&bs_->wakeup, false); \
} \
waited_; })
AIO_WAIT_WHILE(bdrv_get_aio_wait(bs_), \
bdrv_get_aio_context(bs_), \
cond); })
int bdrv_pdiscard(BlockDriverState *bs, int64_t offset, int bytes);
int bdrv_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes);

61
include/block/block_int.h
View file

@ -26,6 +26,7 @@
#include "block/accounting.h"
#include "block/block.h"
#include "block/aio-wait.h"
#include "qemu/queue.h"
#include "qemu/coroutine.h"
#include "qemu/stats64.h"
@ -128,7 +129,8 @@ struct BlockDriver {
int (*bdrv_file_open)(BlockDriverState *bs, QDict *options, int flags,
Error **errp);
void (*bdrv_close)(BlockDriverState *bs);
int (*bdrv_create)(const char *filename, QemuOpts *opts, Error **errp);
int coroutine_fn (*bdrv_co_create_opts)(const char *filename, QemuOpts *opts,
Error **errp);
int (*bdrv_make_empty)(BlockDriverState *bs);
void (*bdrv_refresh_filename)(BlockDriverState *bs, QDict *options);
@ -202,15 +204,22 @@ struct BlockDriver {
/*
* Building block for bdrv_block_status[_above] and
* bdrv_is_allocated[_above]. The driver should answer only
* according to the current layer, and should not set
* BDRV_BLOCK_ALLOCATED, but may set BDRV_BLOCK_RAW. See block.h
* for the meaning of _DATA, _ZERO, and _OFFSET_VALID. The block
* layer guarantees input aligned to request_alignment, as well as
* non-NULL pnum and file.
* according to the current layer, and should only need to set
* BDRV_BLOCK_DATA, BDRV_BLOCK_ZERO, BDRV_BLOCK_OFFSET_VALID,
* and/or BDRV_BLOCK_RAW; if the current layer defers to a backing
* layer, the result should be 0 (and not BDRV_BLOCK_ZERO). See
* block.h for the overall meaning of the bits. As a hint, the
* flag want_zero is true if the caller cares more about precise
* mappings (favor accurate _OFFSET_VALID/_ZERO) or false for
* overall allocation (favor larger *pnum, perhaps by reporting
* _DATA instead of _ZERO). The block layer guarantees input
* clamped to bdrv_getlength() and aligned to request_alignment,
* as well as non-NULL pnum, map, and file; in turn, the driver
* must return an error or set pnum to an aligned non-zero value.
*/
int64_t coroutine_fn (*bdrv_co_get_block_status)(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, int *pnum,
BlockDriverState **file);
int coroutine_fn (*bdrv_co_block_status)(BlockDriverState *bs,
bool want_zero, int64_t offset, int64_t bytes, int64_t *pnum,
int64_t *map, BlockDriverState **file);
/*
* Invalidate any cached meta-data.
@ -709,10 +718,8 @@ struct BlockDriverState {
unsigned int in_flight;
unsigned int serialising_in_flight;
/* Internal to BDRV_POLL_WHILE and bdrv_wakeup. Accessed with atomic
* ops.
*/
bool wakeup;
/* Kicked to signal main loop when a request completes. */
AioWait wait;
/* counter for nested bdrv_io_plug.
* Accessed with atomic ops.
@ -1031,23 +1038,27 @@ void bdrv_format_default_perms(BlockDriverState *bs, BdrvChild *c,
uint64_t *nperm, uint64_t *nshared);
/*
* Default implementation for drivers to pass bdrv_co_get_block_status() to
* Default implementation for drivers to pass bdrv_co_block_status() to
* their file.
*/
int64_t coroutine_fn bdrv_co_get_block_status_from_file(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors,
int *pnum,
BlockDriverState **file);
int coroutine_fn bdrv_co_block_status_from_file(BlockDriverState *bs,
bool want_zero,
int64_t offset,
int64_t bytes,
int64_t *pnum,
int64_t *map,
BlockDriverState **file);
/*
* Default implementation for drivers to pass bdrv_co_get_block_status() to
* Default implementation for drivers to pass bdrv_co_block_status() to
* their backing file.
*/
int64_t coroutine_fn bdrv_co_get_block_status_from_backing(BlockDriverState *bs,
int64_t sector_num,
int nb_sectors,
int *pnum,
BlockDriverState **file);
int coroutine_fn bdrv_co_block_status_from_backing(BlockDriverState *bs,
bool want_zero,
int64_t offset,
int64_t bytes,
int64_t *pnum,
int64_t *map,
BlockDriverState **file);
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);

6
qapi/block-core.json
View file

@ -3676,7 +3676,8 @@
#
# @node-name: node name. Note that errors may be reported for the root node
# that is directly attached to a guest device rather than for the
# node where the error occurred. (Since: 2.8)
# node where the error occurred. The node name is not present if
# the drive is empty. (Since: 2.8)
#
# @operation: I/O operation
#
@ -3707,7 +3708,8 @@
#
##
{ 'event': 'BLOCK_IO_ERROR',
'data': { 'device': 'str', 'node-name': 'str', 'operation': 'IoOperationType',
'data': { 'device': 'str', '*node-name': 'str',
'operation': 'IoOperationType',
'action': 'BlockErrorAction', '*nospace': 'bool',
'reason': 'str' } }

2
qemu-img.c
View file

@ -3469,7 +3469,7 @@ static int img_resize(int argc, char **argv)
}
}
if (optind != argc - 1) {
error_exit("Expecting one image file name");
error_exit("Expecting image file name and size");
}
filename = argv[optind++];

2
tests/Makefile.include
View file

@ -92,6 +92,7 @@ gcov-files-test-hbitmap-y = blockjob.c
check-unit-y += tests/test-bdrv-drain$(EXESUF)
check-unit-y += tests/test-blockjob$(EXESUF)
check-unit-y += tests/test-blockjob-txn$(EXESUF)
check-unit-y += tests/test-block-backend$(EXESUF)
check-unit-y += tests/test-x86-cpuid$(EXESUF)
# all code tested by test-x86-cpuid is inside topology.h
gcov-files-test-x86-cpuid-y =
@ -622,6 +623,7 @@ tests/test-throttle$(EXESUF): tests/test-throttle.o $(test-block-obj-y)
tests/test-bdrv-drain$(EXESUF): tests/test-bdrv-drain.o $(test-block-obj-y) $(test-util-obj-y)
tests/test-blockjob$(EXESUF): tests/test-blockjob.o $(test-block-obj-y) $(test-util-obj-y)
tests/test-blockjob-txn$(EXESUF): tests/test-blockjob-txn.o $(test-block-obj-y) $(test-util-obj-y)
tests/test-block-backend$(EXESUF): tests/test-block-backend.o $(test-block-obj-y) $(test-util-obj-y)
tests/test-thread-pool$(EXESUF): tests/test-thread-pool.o $(test-block-obj-y)
tests/test-iov$(EXESUF): tests/test-iov.o $(test-util-obj-y)
tests/test-hbitmap$(EXESUF): tests/test-hbitmap.o $(test-util-obj-y) $(test-crypto-obj-y)

29
tests/qemu-iotests/033
View file

@ -64,6 +64,9 @@ do_test()
} | $QEMU_IO $IO_EXTRA_ARGS
}
echo
echo "=== Test aligned and misaligned write zeroes operations ==="
for write_zero_cmd in "write -z" "aio_write -z"; do
for align in 512 4k; do
echo
@ -102,7 +105,33 @@ for align in 512 4k; do
done
done
# Trigger truncate that would shrink qcow2 L1 table, which is done by
# clearing one entry (8 bytes) with bdrv_co_pwrite_zeroes()
echo
echo "=== Test misaligned write zeroes via truncate ==="
echo
# any size will do, but the smaller the size the smaller the required image
CLUSTER_SIZE=$((4 * 1024))
L2_COVERAGE=$(($CLUSTER_SIZE * $CLUSTER_SIZE / 8))
_make_test_img $(($L2_COVERAGE * 2))
do_test 512 "write -P 1 0 0x200" "$TEST_IMG" | _filter_qemu_io
# next L2 table
do_test 512 "write -P 1 $L2_COVERAGE 0x200" "$TEST_IMG" | _filter_qemu_io
# only interested in qcow2 here; also other formats might respond with
# "not supported" error message
if [ $IMGFMT = "qcow2" ]; then
do_test 512 "truncate $L2_COVERAGE" "$TEST_IMG" | _filter_qemu_io
fi
do_test 512 "read -P 1 0 0x200" "$TEST_IMG" | _filter_qemu_io
# success, all done
echo
echo "*** done"
rm -f $seq.full
status=0

13
tests/qemu-iotests/033.out
View file

@ -1,6 +1,8 @@
QA output created by 033
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
=== Test aligned and misaligned write zeroes operations ===
== preparing image ==
wrote 1024/1024 bytes at offset 512
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
@ -164,4 +166,15 @@ read 512/512 bytes at offset 512
read 3072/3072 bytes at offset 1024
3 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== Test misaligned write zeroes via truncate ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=4194304
wrote 512/512 bytes at offset 0
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 512/512 bytes at offset 2097152
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 512/512 bytes at offset 0
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
*** done

82
tests/test-block-backend.c Normal file
View file

@ -0,0 +1,82 @@
/*
* BlockBackend tests
*
* Copyright (c) 2017 Kevin Wolf <kwolf@redhat.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "block/block.h"
#include "sysemu/block-backend.h"
#include "qapi/error.h"
static void test_drain_aio_error_flush_cb(void *opaque, int ret)
{
bool *completed = opaque;
g_assert(ret == -ENOMEDIUM);
*completed = true;
}
static void test_drain_aio_error(void)
{
BlockBackend *blk = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
BlockAIOCB *acb;
bool completed = false;
acb = blk_aio_flush(blk, test_drain_aio_error_flush_cb, &completed);
g_assert(acb != NULL);
g_assert(completed == false);
blk_drain(blk);
g_assert(completed == true);
blk_unref(blk);
}
static void test_drain_all_aio_error(void)
{
BlockBackend *blk = blk_new(BLK_PERM_ALL, BLK_PERM_ALL);
BlockAIOCB *acb;
bool completed = false;
acb = blk_aio_flush(blk, test_drain_aio_error_flush_cb, &completed);
g_assert(acb != NULL);
g_assert(completed == false);
blk_drain_all();
g_assert(completed == true);
blk_unref(blk);
}
int main(int argc, char **argv)
{
bdrv_init();
qemu_init_main_loop(&error_abort);
g_test_init(&argc, &argv, NULL);
g_test_add_func("/block-backend/drain_aio_error", test_drain_aio_error);
g_test_add_func("/block-backend/drain_all_aio_error",
test_drain_all_aio_error);
return g_test_run();
}

2
util/Makefile.objs
View file

@ -1,7 +1,7 @@
util-obj-y = osdep.o cutils.o unicode.o qemu-timer-common.o
util-obj-y += bufferiszero.o
util-obj-y += lockcnt.o
util-obj-y += aiocb.o async.o thread-pool.o qemu-timer.o
util-obj-y += aiocb.o async.o aio-wait.o thread-pool.o qemu-timer.o
util-obj-y += main-loop.o iohandler.o
util-obj-$(CONFIG_POSIX) += aio-posix.o
util-obj-$(CONFIG_POSIX) += compatfd.o

40
util/aio-wait.c Normal file
View file

@ -0,0 +1,40 @@
/*
* AioContext wait support
*
* Copyright (C) 2018 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "qemu/main-loop.h"
#include "block/aio-wait.h"
static void dummy_bh_cb(void *opaque)
{
/* The point is to make AIO_WAIT_WHILE()'s aio_poll() return */
}
void aio_wait_kick(AioWait *wait)
{
/* The barrier (or an atomic op) is in the caller. */
if (atomic_read(&wait->need_kick)) {
aio_bh_schedule_oneshot(qemu_get_aio_context(), dummy_bh_cb, NULL);
}
}