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block: Set request_alignment during .bdrv_refresh_limits() 

We want to eventually stick request_alignment alongside other
BlockLimits, but first, we must ensure it is populated at the
same time as all other limits, rather than being a special case
that is set only when a block is first opened.

Add a .bdrv_refresh_limits() to all four of our legacy devices
that will always be sector-only (bochs, cloop, dmg, vvfat), in
spite of their recent conversion to expose a byte interface.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2016-06-23 16:37:17 -06:00 committed by Kevin Wolf
parent 2914a1de99
commit a65064816d
4 changed files with 24 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
block/bochs.c
View File

@ -105,7 +105,6 @@ static int bochs_open(BlockDriverState *bs, QDict *options, int flags,
int ret;
bs->read_only = 1; // no write support yet
bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
ret = bdrv_pread(bs->file->bs, 0, &bochs, sizeof(bochs));
if (ret < 0) {
@ -189,6 +188,11 @@ fail:
return ret;
}
static void bochs_refresh_limits(BlockDriverState *bs, Error **errp)
{
bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
}
static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num)
{
BDRVBochsState *s = bs->opaque;
@ -283,6 +287,7 @@ static BlockDriver bdrv_bochs = {
.instance_size = sizeof(BDRVBochsState),
.bdrv_probe = bochs_probe,
.bdrv_open = bochs_open,
.bdrv_refresh_limits = bochs_refresh_limits,
.bdrv_co_preadv = bochs_co_preadv,
.bdrv_close = bochs_close,
};

7
block/cloop.c
View File

@ -67,7 +67,6 @@ static int cloop_open(BlockDriverState *bs, QDict *options, int flags,
int ret;
bs->read_only = 1;
bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
/* read header */
ret = bdrv_pread(bs->file->bs, 128, &s->block_size, 4);
@ -199,6 +198,11 @@ fail:
return ret;
}
static void cloop_refresh_limits(BlockDriverState *bs, Error **errp)
{
bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
}
static inline int cloop_read_block(BlockDriverState *bs, int block_num)
{
BDRVCloopState *s = bs->opaque;
@ -280,6 +284,7 @@ static BlockDriver bdrv_cloop = {
.instance_size = sizeof(BDRVCloopState),
.bdrv_probe = cloop_probe,
.bdrv_open = cloop_open,
.bdrv_refresh_limits = cloop_refresh_limits,
.bdrv_co_preadv = cloop_co_preadv,
.bdrv_close = cloop_close,
};

7
block/dmg.c
View File

@ -439,7 +439,6 @@ static int dmg_open(BlockDriverState *bs, QDict *options, int flags,
int ret;
bs->read_only = 1;
bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
s->n_chunks = 0;
s->offsets = s->lengths = s->sectors = s->sectorcounts = NULL;
@ -547,6 +546,11 @@ fail:
return ret;
}
static void dmg_refresh_limits(BlockDriverState *bs, Error **errp)
{
bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
}
static inline int is_sector_in_chunk(BDRVDMGState* s,
uint32_t chunk_num, uint64_t sector_num)
{
@ -720,6 +724,7 @@ static BlockDriver bdrv_dmg = {
.instance_size = sizeof(BDRVDMGState),
.bdrv_probe = dmg_probe,
.bdrv_open = dmg_open,
.bdrv_refresh_limits = dmg_refresh_limits,
.bdrv_co_preadv = dmg_co_preadv,
.bdrv_close = dmg_close,
};

7
block/vvfat.c
View File

@ -1177,7 +1177,6 @@ static int vvfat_open(BlockDriverState *bs, QDict *options, int flags,
bs->read_only = 0;
}
bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
bs->total_sectors = cyls * heads * secs;
if (init_directories(s, dirname, heads, secs, errp)) {
@ -1209,6 +1208,11 @@ fail:
return ret;
}
static void vvfat_refresh_limits(BlockDriverState *bs, Error **errp)
{
bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
}
static inline void vvfat_close_current_file(BDRVVVFATState *s)
{
if(s->current_mapping) {
@ -3046,6 +3050,7 @@ static BlockDriver bdrv_vvfat = {
.bdrv_parse_filename = vvfat_parse_filename,
.bdrv_file_open = vvfat_open,
.bdrv_refresh_limits = vvfat_refresh_limits,
.bdrv_close = vvfat_close,
.bdrv_co_preadv = vvfat_co_preadv,