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Moved emulation of erase values up into lfs_testbd

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Yes this is more expensive, since small programs need to rewrite the
whole block in order to conform to the block device API. However, it
reduces code duplication and keeps all of the test-related block device
emulation in lfs_testbd.

Some people have used lfs_filebd/lfs_rambd as a starting point for new block
devices and I think it should be clear that erase does not need to have side
effects. Though to be fair this also just means we should have more
examples of block devices...
This commit is contained in:
Christopher Haster
2022-08-17 11:50:45 -05:00
parent b08463f8de
commit a368d3a07c
6 changed files with 127 additions and 147 deletions
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bd/lfs_rambd.c
+14 -27
View File
@@ -13,12 +13,12 @@ int lfs_rambd_createcfg(const struct lfs_config *cfg,
".read=%p, .prog=%p, .erase=%p, .sync=%p, "
".read_size=%"PRIu32", .prog_size=%"PRIu32", "
".block_size=%"PRIu32", .block_count=%"PRIu32"}, "
"%p {.erase_value=%"PRId32", .buffer=%p})",
"%p {.buffer=%p})",
(void*)cfg, cfg->context,
(void*)(uintptr_t)cfg->read, (void*)(uintptr_t)cfg->prog,
(void*)(uintptr_t)cfg->erase, (void*)(uintptr_t)cfg->sync,
cfg->read_size, cfg->prog_size, cfg->block_size, cfg->block_count,
(void*)bdcfg, bdcfg->erase_value, bdcfg->buffer);
(void*)bdcfg, bdcfg->buffer);
lfs_rambd_t *bd = cfg->context;
bd->cfg = bdcfg;
@@ -33,13 +33,8 @@ int lfs_rambd_createcfg(const struct lfs_config *cfg,
}
}
// zero for reproducibility?
if (bd->cfg->erase_value != -1) {
memset(bd->buffer, bd->cfg->erase_value,
cfg->block_size * cfg->block_count);
} else {
memset(bd->buffer, 0, cfg->block_size * cfg->block_count);
}
// zero for reproducibility
memset(bd->buffer, 0, cfg->block_size * cfg->block_count);
LFS_RAMBD_TRACE("lfs_rambd_createcfg -> %d", 0);
return 0;
@@ -54,7 +49,7 @@ int lfs_rambd_create(const struct lfs_config *cfg) {
(void*)(uintptr_t)cfg->read, (void*)(uintptr_t)cfg->prog,
(void*)(uintptr_t)cfg->erase, (void*)(uintptr_t)cfg->sync,
cfg->read_size, cfg->prog_size, cfg->block_size, cfg->block_count);
static const struct lfs_rambd_config defaults = {.erase_value=-1};
static const struct lfs_rambd_config defaults = {0};
int err = lfs_rambd_createcfg(cfg, &defaults);
LFS_RAMBD_TRACE("lfs_rambd_create -> %d", err);
return err;
@@ -79,9 +74,10 @@ int lfs_rambd_read(const struct lfs_config *cfg, lfs_block_t block,
lfs_rambd_t *bd = cfg->context;
// check if read is valid
LFS_ASSERT(block < cfg->block_count);
LFS_ASSERT(off % cfg->read_size == 0);
LFS_ASSERT(size % cfg->read_size == 0);
LFS_ASSERT(block < cfg->block_count);
LFS_ASSERT(off+size <= cfg->block_size);
// read data
memcpy(buffer, &bd->buffer[block*cfg->block_size + off], size);
@@ -98,17 +94,10 @@ int lfs_rambd_prog(const struct lfs_config *cfg, lfs_block_t block,
lfs_rambd_t *bd = cfg->context;
// check if write is valid
LFS_ASSERT(block < cfg->block_count);
LFS_ASSERT(off % cfg->prog_size == 0);
LFS_ASSERT(size % cfg->prog_size == 0);
LFS_ASSERT(block < cfg->block_count);
// check that data was erased? only needed for testing
if (bd->cfg->erase_value != -1) {
for (lfs_off_t i = 0; i < size; i++) {
LFS_ASSERT(bd->buffer[block*cfg->block_size + off + i] ==
bd->cfg->erase_value);
}
}
LFS_ASSERT(off+size <= cfg->block_size);
// program data
memcpy(&bd->buffer[block*cfg->block_size + off], buffer, size);
@@ -119,16 +108,12 @@ int lfs_rambd_prog(const struct lfs_config *cfg, lfs_block_t block,
int lfs_rambd_erase(const struct lfs_config *cfg, lfs_block_t block) {
LFS_RAMBD_TRACE("lfs_rambd_erase(%p, 0x%"PRIx32")", (void*)cfg, block);
lfs_rambd_t *bd = cfg->context;
// check if erase is valid
LFS_ASSERT(block < cfg->block_count);
// erase, only needed for testing
if (bd->cfg->erase_value != -1) {
memset(&bd->buffer[block*cfg->block_size],
bd->cfg->erase_value, cfg->block_size);
}
// erase is a noop
(void)block;
LFS_RAMBD_TRACE("lfs_rambd_erase -> %d", 0);
return 0;
@@ -136,8 +121,10 @@ int lfs_rambd_erase(const struct lfs_config *cfg, lfs_block_t block) {
int lfs_rambd_sync(const struct lfs_config *cfg) {
LFS_RAMBD_TRACE("lfs_rambd_sync(%p)", (void*)cfg);
// sync does nothing because we aren't backed by anything real
// sync is a noop
(void)cfg;
LFS_RAMBD_TRACE("lfs_rambd_sync -> %d", 0);
return 0;
}