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![Vladimir Sementsov-Ogievskiy](/assets/img/avatar_default.png)
We are generally moving to int64_t for both offset and bytes parameters on all io paths. Main motivation is realization of 64-bit write_zeroes operation for fast zeroing large disk chunks, up to the whole disk. We chose signed type, to be consistent with off_t (which is signed) and with possibility for signed return type (where negative value means error). So, convert driver discard handlers bytes parameter to int64_t. The only caller of all updated function is bdrv_co_pdiscard in block/io.c. It is already prepared to work with 64bit requests, but pass at most max(bs->bl.max_pdiscard, INT_MAX) to the driver. Let's look at all updated functions: blkdebug: all calculations are still OK, thanks to bdrv_check_qiov_request(). both rule_check and bdrv_co_pdiscard are 64bit blklogwrites: pass to blk_loc_writes_co_log which is 64bit blkreplay, copy-on-read, filter-compress: pass to bdrv_co_pdiscard, OK copy-before-write: pass to bdrv_co_pdiscard which is 64bit and to cbw_do_copy_before_write which is 64bit file-posix: one handler calls raw_account_discard() is 64bit and both handlers calls raw_do_pdiscard(). Update raw_do_pdiscard, which pass to RawPosixAIOData::aio_nbytes, which is 64bit (and calls raw_account_discard()) gluster: somehow, third argument of glfs_discard_async is size_t. Let's set max_pdiscard accordingly. iscsi: iscsi_allocmap_set_invalid is 64bit, !is_byte_request_lun_aligned is 64bit. list.num is uint32_t. Let's clarify max_pdiscard and pdiscard_alignment. mirror_top: pass to bdrv_mirror_top_do_write() which is 64bit nbd: protocol limitation. max_pdiscard is alredy set strict enough, keep it as is for now. nvme: buf.nlb is uint32_t and we do shift. So, add corresponding limits to nvme_refresh_limits(). preallocate: pass to bdrv_co_pdiscard() which is 64bit. rbd: pass to qemu_rbd_start_co() which is 64bit. qcow2: calculations are still OK, thanks to bdrv_check_qiov_request(), qcow2_cluster_discard() is 64bit. raw-format: raw_adjust_offset() is 64bit, bdrv_co_pdiscard too. throttle: pass to bdrv_co_pdiscard() which is 64bit and to throttle_group_co_io_limits_intercept() which is 64bit as well. test-block-iothread: bytes argument is unused Great! Now all drivers are prepared to handle 64bit discard requests, or else have explicit max_pdiscard limits. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20210903102807.27127-11-vsementsov@virtuozzo.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com>
160 lines
5 KiB
C
160 lines
5 KiB
C
/*
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* Compress filter block driver
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*
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* Copyright (c) 2019 Virtuozzo International GmbH
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*
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* Author:
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* Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
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* (based on block/copy-on-read.c by Max Reitz)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 or
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* (at your option) any later version of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "block/block_int.h"
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#include "qemu/module.h"
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#include "qapi/error.h"
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static int compress_open(BlockDriverState *bs, QDict *options, int flags,
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Error **errp)
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{
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bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
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BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
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false, errp);
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if (!bs->file) {
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return -EINVAL;
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}
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if (!bs->file->bs->drv || !block_driver_can_compress(bs->file->bs->drv)) {
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error_setg(errp,
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"Compression is not supported for underlying format: %s",
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bdrv_get_format_name(bs->file->bs) ?: "(no format)");
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return -ENOTSUP;
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}
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bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED |
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(BDRV_REQ_FUA & bs->file->bs->supported_write_flags);
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bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
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((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
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bs->file->bs->supported_zero_flags);
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return 0;
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}
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static int64_t compress_getlength(BlockDriverState *bs)
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{
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return bdrv_getlength(bs->file->bs);
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}
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static int coroutine_fn compress_co_preadv_part(BlockDriverState *bs,
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int64_t offset, int64_t bytes,
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QEMUIOVector *qiov,
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size_t qiov_offset,
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BdrvRequestFlags flags)
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{
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return bdrv_co_preadv_part(bs->file, offset, bytes, qiov, qiov_offset,
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flags);
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}
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static int coroutine_fn compress_co_pwritev_part(BlockDriverState *bs,
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int64_t offset,
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int64_t bytes,
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QEMUIOVector *qiov,
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size_t qiov_offset,
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BdrvRequestFlags flags)
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{
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return bdrv_co_pwritev_part(bs->file, offset, bytes, qiov, qiov_offset,
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flags | BDRV_REQ_WRITE_COMPRESSED);
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}
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static int coroutine_fn compress_co_pwrite_zeroes(BlockDriverState *bs,
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int64_t offset, int64_t bytes,
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BdrvRequestFlags flags)
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{
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return bdrv_co_pwrite_zeroes(bs->file, offset, bytes, flags);
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}
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static int coroutine_fn compress_co_pdiscard(BlockDriverState *bs,
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int64_t offset, int64_t bytes)
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{
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return bdrv_co_pdiscard(bs->file, offset, bytes);
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}
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static void compress_refresh_limits(BlockDriverState *bs, Error **errp)
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{
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BlockDriverInfo bdi;
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int ret;
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if (!bs->file) {
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return;
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}
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ret = bdrv_get_info(bs->file->bs, &bdi);
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if (ret < 0 || bdi.cluster_size == 0) {
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return;
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}
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bs->bl.request_alignment = bdi.cluster_size;
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}
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static void compress_eject(BlockDriverState *bs, bool eject_flag)
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{
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bdrv_eject(bs->file->bs, eject_flag);
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}
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static void compress_lock_medium(BlockDriverState *bs, bool locked)
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{
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bdrv_lock_medium(bs->file->bs, locked);
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}
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static BlockDriver bdrv_compress = {
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.format_name = "compress",
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.bdrv_open = compress_open,
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.bdrv_child_perm = bdrv_default_perms,
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.bdrv_getlength = compress_getlength,
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.bdrv_co_preadv_part = compress_co_preadv_part,
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.bdrv_co_pwritev_part = compress_co_pwritev_part,
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.bdrv_co_pwrite_zeroes = compress_co_pwrite_zeroes,
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.bdrv_co_pdiscard = compress_co_pdiscard,
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.bdrv_refresh_limits = compress_refresh_limits,
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.bdrv_eject = compress_eject,
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.bdrv_lock_medium = compress_lock_medium,
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.has_variable_length = true,
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.is_filter = true,
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};
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static void bdrv_compress_init(void)
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{
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bdrv_register(&bdrv_compress);
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}
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block_init(bdrv_compress_init);
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