[PATCH v4 00/10] Implement bdrv_{pread, pwrite, pwrite_sync, pwrite_zeroes}() using generated_co_wrapper

[Alberto Faria]

Start by making the interfaces of analogous non-coroutine and coroutine
functions consistent with each other, then implement the non-coroutine
ones using generated_co_wrapper.

For the bdrv_pwrite_sync() case, also add the missing
bdrv_co_pwrite_sync() function.

Changes v3 --> v4:
- Removed `assert(bytes <= SIZE_MAX)` from bdrv_co_{pread,pwrite}()
  (undoing v3) since bdrv_check_request32(), which is called further
  down the stack, will cause -EIO to be returned if bytes > SIZE_MAX.
- Audited callers to make sure bdrv_{pread,pwrite}() now returning -EIO
  instead of -EINVAL when 'bytes' is negative doesn't break things.
  Still, would appreciate it if someone more accustomed to the code base
  were able to double-check this.

Changes v2 --> v3:
- Add `assert(bytes <= SIZE_MAX)` to bdrv_co_{pread,pwrite}().

Changes v1 --> v2:
- Drop unnecessary assignments to ret in vhdx_log_peek_hdr(),
  vhdx_log_read_sectors(), and vhdx_log_write_sectors().
- Simplify vdi_co_pwritev() return expression.
- Add patch making crypto block callbacks return 0 on success.
- Clarify in commit message that bdrv_pwrite_zeroes() now calls
  trace_bdrv_co_pwrite_zeroes() and clears the BDRV_REQ_MAY_UNMAP flag
  when appropriate, which it didn't previously.
- Use _co_ functions in the implementation of bdrv_co_pwrite_sync().
- Add patch converting uses of bdrv_pwrite_sync() into
  bdrv_co_pwrite_sync() when the callers are already coroutine_fn.
- Add patch making qcow2_mark_dirty() use bdrv_pwrite_sync() instead of
  calling bdrv_pwrite() and bdrv_flush() separately.

Alberto Faria (10):
  block: Add a 'flags' param to bdrv_{pread,pwrite,pwrite_sync}()
  block: Change bdrv_{pread,pwrite,pwrite_sync}() param order
  block: Make bdrv_{pread,pwrite}() return 0 on success
  crypto: Make block callbacks return 0 on success
  block: Make bdrv_co_pwrite() take a const buffer
  block: Make 'bytes' param of bdrv_co_{pread,pwrite,preadv,pwritev}()
    an int64_t
  block: Implement bdrv_{pread,pwrite,pwrite_zeroes}() using
    generated_co_wrapper
  block: Add bdrv_co_pwrite_sync()
  block: Use bdrv_co_pwrite_sync() when caller is coroutine_fn
  block/qcow2: Use bdrv_pwrite_sync() in qcow2_mark_dirty()

 block/blklogwrites.c             |  6 +--
 block/bochs.c                    | 10 ++--
 block/cloop.c                    | 12 ++---
 block/coroutines.h               |  4 +-
 block/crypto.c                   | 56 +++++++++++-----------
 block/dmg.c                      | 36 +++++++-------
 block/io.c                       | 55 ++--------------------
 block/parallels-ext.c            |  6 +--
 block/parallels.c                | 12 ++---
 block/qcow.c                     | 41 ++++++++--------
 block/qcow2-bitmap.c             | 14 +++---
 block/qcow2-cache.c              |  9 ++--
 block/qcow2-cluster.c            | 19 ++++----
 block/qcow2-refcount.c           | 58 ++++++++++++-----------
 block/qcow2-snapshot.c           | 53 ++++++++++-----------
 block/qcow2.c                    | 80 ++++++++++++++++----------------
 block/qed.c                      | 13 ++----
 block/vdi.c                      | 16 +++----
 block/vhdx-log.c                 | 23 +++++----
 block/vhdx.c                     | 36 +++++++-------
 block/vmdk.c                     | 70 +++++++++++++---------------
 block/vpc.c                      | 23 ++++-----
 block/vvfat.c                    | 11 +++--
 crypto/block-luks.c              |  8 ++--
 crypto/block.c                   |  6 +--
 include/block/block-io.h         | 22 ++++++---
 include/block/block_int-io.h     |  4 +-
 include/crypto/block.h           | 32 ++++++-------
 tests/unit/test-block-iothread.c | 12 ++---
 tests/unit/test-crypto-block.c   | 38 +++++++--------
 30 files changed, 370 insertions(+), 415 deletions(-)

-- 
2.35.3