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WIP Added allocation randomization for dynamic wear-leveling

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This commit is contained in:
Christopher Haster
2018-08-09 09:06:17 -05:00
parent 67bbee56f5
commit 24eaf86b0e
10 changed files with 250 additions and 59 deletions
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104
emubd/lfs_emubd.c
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@@ -19,6 +19,40 @@
#include <inttypes.h>
// Emulated block device utils
static inline void lfs_emubd_tole32(lfs_emubd_t *emu) {
emu->cfg.read_size = lfs_tole32(emu->cfg.read_size);
emu->cfg.prog_size = lfs_tole32(emu->cfg.prog_size);
emu->cfg.block_size = lfs_tole32(emu->cfg.block_size);
emu->cfg.block_count = lfs_tole32(emu->cfg.block_count);
emu->stats.read_count = lfs_tole32(emu->stats.read_count);
emu->stats.prog_count = lfs_tole32(emu->stats.prog_count);
emu->stats.erase_count = lfs_tole32(emu->stats.erase_count);
for (int i = 0; i < sizeof(emu->history.blocks) /
sizeof(emu->history.blocks[0]); i++) {
emu->history.blocks[i] = lfs_tole32(emu->history.blocks[i]);
}
}
static inline void lfs_emubd_fromle32(lfs_emubd_t *emu) {
emu->cfg.read_size = lfs_fromle32(emu->cfg.read_size);
emu->cfg.prog_size = lfs_fromle32(emu->cfg.prog_size);
emu->cfg.block_size = lfs_fromle32(emu->cfg.block_size);
emu->cfg.block_count = lfs_fromle32(emu->cfg.block_count);
emu->stats.read_count = lfs_fromle32(emu->stats.read_count);
emu->stats.prog_count = lfs_fromle32(emu->stats.prog_count);
emu->stats.erase_count = lfs_fromle32(emu->stats.erase_count);
for (int i = 0; i < sizeof(emu->history.blocks) /
sizeof(emu->history.blocks[0]); i++) {
emu->history.blocks[i] = lfs_fromle32(emu->history.blocks[i]);
}
}
// Block device emulated on existing filesystem
int lfs_emubd_create(const struct lfs_config *cfg, const char *path) {
lfs_emubd_t *emu = cfg->context;
@@ -46,20 +80,39 @@ int lfs_emubd_create(const struct lfs_config *cfg, const char *path) {
}
// Load stats to continue incrementing
snprintf(emu->child, LFS_NAME_MAX, "stats");
snprintf(emu->child, LFS_NAME_MAX, ".stats");
FILE *f = fopen(emu->path, "r");
if (!f) {
return -errno;
memset(&emu->stats, 0, sizeof(emu->stats));
} else {
size_t res = fread(&emu->stats, sizeof(emu->stats), 1, f);
lfs_emubd_fromle32(emu);
if (res < 1) {
return -errno;
}
err = fclose(f);
if (err) {
return -errno;
}
}
size_t res = fread(&emu->stats, sizeof(emu->stats), 1, f);
if (res < 1) {
return -errno;
}
// Load history
snprintf(emu->child, LFS_NAME_MAX, ".history");
f = fopen(emu->path, "r");
if (!f) {
memset(&emu->history, 0, sizeof(emu->history));
} else {
size_t res = fread(&emu->history, sizeof(emu->history), 1, f);
lfs_emubd_fromle32(emu);
if (res < 1) {
return -errno;
}
err = fclose(f);
if (err) {
return -errno;
err = fclose(f);
if (err) {
return -errno;
}
}
return 0;
@@ -161,6 +214,13 @@ int lfs_emubd_prog(const struct lfs_config *cfg, lfs_block_t block,
return -errno;
}
// update history and stats
if (block != emu->history.blocks[0]) {
memcpy(&emu->history.blocks[1], &emu->history.blocks[0],
sizeof(emu->history) - sizeof(emu->history.blocks[0]));
emu->history.blocks[0] = block;
}
emu->stats.prog_count += 1;
return 0;
}
@@ -206,13 +266,15 @@ int lfs_emubd_sync(const struct lfs_config *cfg) {
lfs_emubd_t *emu = cfg->context;
// Just write out info/stats for later lookup
snprintf(emu->child, LFS_NAME_MAX, "config");
snprintf(emu->child, LFS_NAME_MAX, ".config");
FILE *f = fopen(emu->path, "w");
if (!f) {
return -errno;
}
lfs_emubd_tole32(emu);
size_t res = fwrite(&emu->cfg, sizeof(emu->cfg), 1, f);
lfs_emubd_fromle32(emu);
if (res < 1) {
return -errno;
}
@@ -222,13 +284,33 @@ int lfs_emubd_sync(const struct lfs_config *cfg) {
return -errno;
}
snprintf(emu->child, LFS_NAME_MAX, "stats");
snprintf(emu->child, LFS_NAME_MAX, ".stats");
f = fopen(emu->path, "w");
if (!f) {
return -errno;
}
lfs_emubd_tole32(emu);
res = fwrite(&emu->stats, sizeof(emu->stats), 1, f);
lfs_emubd_fromle32(emu);
if (res < 1) {
return -errno;
}
err = fclose(f);
if (err) {
return -errno;
}
snprintf(emu->child, LFS_NAME_MAX, ".history");
f = fopen(emu->path, "w");
if (!f) {
return -errno;
}
lfs_emubd_tole32(emu);
res = fwrite(&emu->history, sizeof(emu->history), 1, f);
lfs_emubd_fromle32(emu);
if (res < 1) {
return -errno;
}