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| author | Hanna Czenczek <hreitz@redhat.com> | 2023-04-11 19:34:15 +0200 |
|---|---|---|
| committer | Hanna Czenczek <hreitz@redhat.com> | 2023-06-05 13:11:02 +0200 |
| commit | 3d06cea8256d54a6b0238934c31012f7f17100f5 (patch) | |
| tree | 960690d14da50c72b6c09b8320e324a99a353d76 /include | |
| parent | 848a6caa88b9f082c89c9b41afa975761262981d (diff) | |
| download | qemu-3d06cea8256d54a6b0238934c31012f7f17100f5.zip qemu-3d06cea8256d54a6b0238934c31012f7f17100f5.tar.gz qemu-3d06cea8256d54a6b0238934c31012f7f17100f5.tar.bz2 | |
util/iov: Make qiov_slice() public
We want to inline qemu_iovec_init_extended() in block/io.c for padding
requests, and having access to qiov_slice() is useful for this. As a
public function, it is renamed to qemu_iovec_slice().
(We will need to count the number of I/O vector elements of a slice
there, and then later process this slice. Without qiov_slice(), we
would need to call qemu_iovec_subvec_niov(), and all further
IOV-processing functions may need to skip prefixing elements to
accomodate for a qiov_offset. Because qemu_iovec_subvec_niov()
internally calls qiov_slice(), we can just have the block/io.c code call
qiov_slice() itself, thus get the number of elements, and also create an
iovec array with the superfluous prefixing elements stripped, so the
following processing functions no longer need to skip them.)
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Signed-off-by: Hanna Czenczek <hreitz@redhat.com>
Message-Id: <20230411173418.19549-2-hreitz@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/qemu/iov.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/qemu/iov.h b/include/qemu/iov.h index 9330746..46fadfb 100644 --- a/include/qemu/iov.h +++ b/include/qemu/iov.h @@ -229,6 +229,9 @@ int qemu_iovec_init_extended( void *tail_buf, size_t tail_len); void qemu_iovec_init_slice(QEMUIOVector *qiov, QEMUIOVector *source, size_t offset, size_t len); +struct iovec *qemu_iovec_slice(QEMUIOVector *qiov, + size_t offset, size_t len, + size_t *head, size_t *tail, int *niov); int qemu_iovec_subvec_niov(QEMUIOVector *qiov, size_t offset, size_t len); void qemu_iovec_add(QEMUIOVector *qiov, void *base, size_t len); void qemu_iovec_concat(QEMUIOVector *dst, |