diff options
author | Paolo Bonzini <pbonzini@redhat.com> | 2012-03-19 18:07:48 +0100 |
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committer | Kevin Wolf <kwolf@redhat.com> | 2012-04-05 14:54:40 +0200 |
commit | bfc45fc183619eb4f76e3979598a510f41cd88e3 (patch) | |
tree | bbf330f8921819c5e7eb67cc0dea9ce88b669a8d /block | |
parent | 4de659e8eb75df995310c5e57018c5a089c8fc6f (diff) | |
download | hqemu-bfc45fc183619eb4f76e3979598a510f41cd88e3.zip hqemu-bfc45fc183619eb4f76e3979598a510f41cd88e3.tar.gz |
vdi: move aiocb fields to locals
Most of the AIOCB really holds local variables that need to persist
across callback invocation. It can go away now.
Acked-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block')
-rw-r--r-- | block/vdi.c | 163 |
1 files changed, 65 insertions, 98 deletions
diff --git a/block/vdi.c b/block/vdi.c index 407fccc..0c1cff6 100644 --- a/block/vdi.c +++ b/block/vdi.c @@ -145,24 +145,8 @@ void uuid_unparse(const uuid_t uu, char *out) typedef struct { BlockDriverAIOCB common; - int64_t sector_num; - QEMUIOVector *qiov; uint8_t *buf; - /* Total number of sectors. */ - int nb_sectors; - /* Number of sectors for current AIO. */ - int n_sectors; - /* New allocated block map entry. */ - uint32_t bmap_first; - uint32_t bmap_last; - /* Buffer for new allocated block. */ - void *block_buffer; void *orig_buf; - bool is_write; - int header_modified; - struct iovec hd_iov; - QEMUIOVector hd_qiov; - QEMUBH *bh; } VdiAIOCB; typedef struct { @@ -492,34 +476,20 @@ static AIOPool vdi_aio_pool = { .aiocb_size = sizeof(VdiAIOCB), }; -static VdiAIOCB *vdi_aio_setup(BlockDriverState *bs, int64_t sector_num, - QEMUIOVector *qiov, int nb_sectors, int is_write) +static VdiAIOCB *vdi_aio_setup(BlockDriverState *bs, QEMUIOVector *qiov) { VdiAIOCB *acb; - logout("%p, %" PRId64 ", %p, %d, %p, %p, %d\n", - bs, sector_num, qiov, nb_sectors, is_write); + logout("%p, %p\n", bs, qiov); acb = qemu_aio_get(&vdi_aio_pool, bs, NULL, NULL); - acb->sector_num = sector_num; - acb->qiov = qiov; - acb->is_write = is_write; if (qiov->niov > 1) { acb->buf = qemu_blockalign(bs, qiov->size); acb->orig_buf = acb->buf; - if (is_write) { - qemu_iovec_to_buffer(qiov, acb->buf); - } } else { acb->buf = (uint8_t *)qiov->iov->iov_base; } - acb->nb_sectors = nb_sectors; - acb->n_sectors = 0; - acb->bmap_first = VDI_UNALLOCATED; - acb->bmap_last = VDI_UNALLOCATED; - acb->block_buffer = NULL; - acb->header_modified = 0; return acb; } @@ -532,24 +502,25 @@ static int vdi_co_readv(BlockDriverState *bs, uint32_t block_index; uint32_t sector_in_block; uint32_t n_sectors; + struct iovec hd_iov; + QEMUIOVector hd_qiov; int ret; logout("\n"); - acb = vdi_aio_setup(bs, sector_num, qiov, nb_sectors, 0); + acb = vdi_aio_setup(bs, qiov); restart: - block_index = acb->sector_num / s->block_sectors; - sector_in_block = acb->sector_num % s->block_sectors; + block_index = sector_num / s->block_sectors; + sector_in_block = sector_num % s->block_sectors; n_sectors = s->block_sectors - sector_in_block; - if (n_sectors > acb->nb_sectors) { - n_sectors = acb->nb_sectors; + if (n_sectors > nb_sectors) { + n_sectors = nb_sectors; } logout("will read %u sectors starting at sector %" PRIu64 "\n", - n_sectors, acb->sector_num); + n_sectors, sector_num); /* prepare next AIO request */ - acb->n_sectors = n_sectors; bmap_entry = le32_to_cpu(s->bmap[block_index]); if (!VDI_IS_ALLOCATED(bmap_entry)) { /* Block not allocated, return zeros, no need to wait. */ @@ -559,23 +530,23 @@ restart: uint64_t offset = s->header.offset_data / SECTOR_SIZE + (uint64_t)bmap_entry * s->block_sectors + sector_in_block; - acb->hd_iov.iov_base = (void *)acb->buf; - acb->hd_iov.iov_len = n_sectors * SECTOR_SIZE; - qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1); - ret = bdrv_co_readv(bs->file, offset, n_sectors, &acb->hd_qiov); + hd_iov.iov_base = (void *)acb->buf; + hd_iov.iov_len = n_sectors * SECTOR_SIZE; + qemu_iovec_init_external(&hd_qiov, &hd_iov, 1); + ret = bdrv_co_readv(bs->file, offset, n_sectors, &hd_qiov); } - logout("%u sectors read\n", acb->n_sectors); + logout("%u sectors read\n", n_sectors); - acb->nb_sectors -= acb->n_sectors; - acb->sector_num += acb->n_sectors; - acb->buf += acb->n_sectors * SECTOR_SIZE; + nb_sectors -= n_sectors; + sector_num += n_sectors; + acb->buf += n_sectors * SECTOR_SIZE; - if (ret >= 0 && acb->nb_sectors > 0) { + if (ret >= 0 && nb_sectors > 0) { goto restart; } - if (acb->qiov->niov > 1) { - qemu_iovec_from_buffer(acb->qiov, acb->orig_buf, acb->qiov->size); + if (acb->orig_buf) { + qemu_iovec_from_buffer(qiov, acb->orig_buf, qiov->size); qemu_vfree(acb->orig_buf); } qemu_aio_release(acb); @@ -591,96 +562,93 @@ static int vdi_co_writev(BlockDriverState *bs, uint32_t block_index; uint32_t sector_in_block; uint32_t n_sectors; + uint32_t bmap_first = VDI_UNALLOCATED; + uint32_t bmap_last = VDI_UNALLOCATED; + struct iovec hd_iov; + QEMUIOVector hd_qiov; + uint8_t *block = NULL; int ret; logout("\n"); - acb = vdi_aio_setup(bs, sector_num, qiov, nb_sectors, 1); + acb = vdi_aio_setup(bs, qiov); + if (acb->orig_buf) { + qemu_iovec_to_buffer(qiov, acb->buf); + } restart: - block_index = acb->sector_num / s->block_sectors; - sector_in_block = acb->sector_num % s->block_sectors; + block_index = sector_num / s->block_sectors; + sector_in_block = sector_num % s->block_sectors; n_sectors = s->block_sectors - sector_in_block; - if (n_sectors > acb->nb_sectors) { - n_sectors = acb->nb_sectors; + if (n_sectors > nb_sectors) { + n_sectors = nb_sectors; } logout("will write %u sectors starting at sector %" PRIu64 "\n", - n_sectors, acb->sector_num); + n_sectors, sector_num); /* prepare next AIO request */ - acb->n_sectors = n_sectors; bmap_entry = le32_to_cpu(s->bmap[block_index]); if (!VDI_IS_ALLOCATED(bmap_entry)) { /* Allocate new block and write to it. */ uint64_t offset; - uint8_t *block; bmap_entry = s->header.blocks_allocated; s->bmap[block_index] = cpu_to_le32(bmap_entry); s->header.blocks_allocated++; offset = s->header.offset_data / SECTOR_SIZE + (uint64_t)bmap_entry * s->block_sectors; - block = acb->block_buffer; if (block == NULL) { block = g_malloc(s->block_size); - acb->block_buffer = block; - acb->bmap_first = block_index; - assert(!acb->header_modified); - acb->header_modified = 1; + bmap_first = block_index; } - acb->bmap_last = block_index; + bmap_last = block_index; /* Copy data to be written to new block and zero unused parts. */ memset(block, 0, sector_in_block * SECTOR_SIZE); memcpy(block + sector_in_block * SECTOR_SIZE, acb->buf, n_sectors * SECTOR_SIZE); memset(block + (sector_in_block + n_sectors) * SECTOR_SIZE, 0, (s->block_sectors - n_sectors - sector_in_block) * SECTOR_SIZE); - acb->hd_iov.iov_base = (void *)block; - acb->hd_iov.iov_len = s->block_size; - qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1); - ret = bdrv_co_writev(bs->file, offset, s->block_sectors, &acb->hd_qiov); + hd_iov.iov_base = (void *)block; + hd_iov.iov_len = s->block_size; + qemu_iovec_init_external(&hd_qiov, &hd_iov, 1); + ret = bdrv_co_writev(bs->file, offset, s->block_sectors, &hd_qiov); } else { uint64_t offset = s->header.offset_data / SECTOR_SIZE + (uint64_t)bmap_entry * s->block_sectors + sector_in_block; - acb->hd_iov.iov_base = (void *)acb->buf; - acb->hd_iov.iov_len = n_sectors * SECTOR_SIZE; - qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1); - ret = bdrv_co_writev(bs->file, offset, n_sectors, &acb->hd_qiov); + hd_iov.iov_base = (void *)acb->buf; + hd_iov.iov_len = n_sectors * SECTOR_SIZE; + qemu_iovec_init_external(&hd_qiov, &hd_iov, 1); + ret = bdrv_co_writev(bs->file, offset, n_sectors, &hd_qiov); } - acb->nb_sectors -= acb->n_sectors; - acb->sector_num += acb->n_sectors; - acb->buf += acb->n_sectors * SECTOR_SIZE; + nb_sectors -= n_sectors; + sector_num += n_sectors; + acb->buf += n_sectors * SECTOR_SIZE; - logout("%u sectors written\n", acb->n_sectors); - if (ret >= 0 && acb->nb_sectors > 0) { + logout("%u sectors written\n", n_sectors); + if (ret >= 0 && nb_sectors > 0) { goto restart; } logout("finished data write\n"); if (ret >= 0) { ret = 0; - if (acb->header_modified) { - VdiHeader *header = acb->block_buffer; + if (block) { + VdiHeader *header = (VdiHeader *) block; logout("now writing modified header\n"); - assert(VDI_IS_ALLOCATED(acb->bmap_first)); + assert(VDI_IS_ALLOCATED(bmap_first)); *header = s->header; vdi_header_to_le(header); - acb->header_modified = 0; - acb->hd_iov.iov_base = acb->block_buffer; - acb->hd_iov.iov_len = SECTOR_SIZE; - qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1); - ret = bdrv_co_writev(bs->file, 0, 1, &acb->hd_qiov); + hd_iov.iov_base = block; + hd_iov.iov_len = SECTOR_SIZE; + qemu_iovec_init_external(&hd_qiov, &hd_iov, 1); + ret = bdrv_co_writev(bs->file, 0, 1, &hd_qiov); } - if (ret >= 0 && VDI_IS_ALLOCATED(acb->bmap_first)) { + g_free(block); + block = NULL; + if (ret >= 0 && VDI_IS_ALLOCATED(bmap_first)) { /* One or more new blocks were allocated. */ uint64_t offset; - uint32_t bmap_first; - uint32_t bmap_last; - g_free(acb->block_buffer); - acb->block_buffer = NULL; - bmap_first = acb->bmap_first; - bmap_last = acb->bmap_last; logout("now writing modified block map entry %u...%u\n", bmap_first, bmap_last); /* Write modified sectors from block map. */ @@ -688,18 +656,17 @@ restart: bmap_last /= (SECTOR_SIZE / sizeof(uint32_t)); n_sectors = bmap_last - bmap_first + 1; offset = s->bmap_sector + bmap_first; - acb->bmap_first = VDI_UNALLOCATED; - acb->hd_iov.iov_base = (void *)((uint8_t *)&s->bmap[0] + + hd_iov.iov_base = (void *)((uint8_t *)&s->bmap[0] + bmap_first * SECTOR_SIZE); - acb->hd_iov.iov_len = n_sectors * SECTOR_SIZE; - qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1); + hd_iov.iov_len = n_sectors * SECTOR_SIZE; + qemu_iovec_init_external(&hd_qiov, &hd_iov, 1); logout("will write %u block map sectors starting from entry %u\n", n_sectors, bmap_first); - ret = bdrv_co_writev(bs->file, offset, n_sectors, &acb->hd_qiov); + ret = bdrv_co_writev(bs->file, offset, n_sectors, &hd_qiov); } } - if (acb->qiov->niov > 1) { + if (acb->orig_buf) { qemu_vfree(acb->orig_buf); } qemu_aio_release(acb); |