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WIP added framework for full dynamic wear-leveling

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This commit is contained in:
Christopher Haster
2018-08-08 16:34:56 -05:00
parent efc491facb
commit 67bbee56f5
4 changed files with 356 additions and 306 deletions
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2
.travis.yml
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@@ -19,7 +19,7 @@ script:
# run tests with a few different configurations
- make test QUIET=1 CFLAGS+="-DLFS_READ_SIZE=1 -DLFS_CACHE_SIZE=4"
- make test QUIET=1 CFLAGS+="-DLFS_READ_SIZE=512 -DLFS_CACHE_SIZE=512"
- make test QUIET=1 CFLAGS+="-DLFS_READ_SIZE=512 -DLFS_CACHE_SIZE=512 -DLFS_BLOCK_CYCLES=16"
- make test QUIET=1 CFLAGS+="-DLFS_BLOCK_COUNT=1023 -DLFS_LOOKAHEAD=2048"
- make clean test QUIET=1 CFLAGS+="-DLFS_INLINE_MAX=0"

128
lfs.c
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@@ -265,6 +265,8 @@ static int32_t lfs_fs_parent(lfs_t *lfs, const lfs_block_t dir[2],
lfs_mdir_t *parent);
static int lfs_fs_relocate(lfs_t *lfs,
const lfs_block_t oldpair[2], lfs_block_t newpair[2]);
static int lfs_fs_deorphan(lfs_t *lfs);
static int lfs_fs_demove(lfs_t *lfs);
static int lfs_fs_forceconsistency(lfs_t *lfs);
static int lfs_deinit(lfs_t *lfs);
@@ -924,7 +926,27 @@ static int32_t lfs_dir_fetchmatch(lfs_t *lfs,
tempfoundtag -= LFS_MKTAG(0, 1, 0);
}
} else if ((tag & findmask) == (findtag & findmask)) {
int res = lfs_bd_cmp(lfs, dir->pair[0], off+sizeof(tag),
// found a match?
if (lfs_tag_type(findtag) == LFS_TYPE_DIRSTRUCT) {
lfs_block_t child[2];
err = lfs_bd_read(lfs, dir->pair[0], off+sizeof(tag),
child, sizeof(child));
if (err < 0) {
if (err == LFS_ERR_CORRUPT) {
dir->erased = false;
break;
}
return err;
}
lfs_pair_fromle32(child);
if (lfs_pair_cmp(child,
(const lfs_block_t *)findbuffer) == 0) {
tempfoundtag = tag;
}
} else if (lfs_tag_type(findtag) == LFS_TYPE_NAME) {
int res = lfs_bd_cmp(lfs,
dir->pair[0], off+sizeof(tag),
findbuffer, lfs_tag_size(findtag));
if (res < 0) {
if (res == LFS_ERR_CORRUPT) {
@@ -935,7 +957,9 @@ static int32_t lfs_dir_fetchmatch(lfs_t *lfs,
}
if (res) {
// found a match
tempfoundtag = tag;
}
} else {
tempfoundtag = tag;
}
}
@@ -1016,8 +1040,6 @@ static int lfs_dir_compact(lfs_t *lfs,
lfs_mdir_t *source, uint16_t begin, uint16_t end) {
// save some state in case block is bad
const lfs_block_t oldpair[2] = {dir->pair[1], dir->pair[0]};
int16_t ack;
bool expanding = false;
bool relocated = false;
// There's nothing special about our global delta, so feed it back
@@ -1025,11 +1047,16 @@ static int lfs_dir_compact(lfs_t *lfs,
lfs_global_xor(&lfs->locals, &dir->locals);
lfs_global_zero(&dir->locals);
while (true) {
// last complete id
dir->count = end - begin;
int16_t ack = -1;
bool exhausted = false;
// increment revision count
dir->rev += 1;
if (lfs_pair_cmp(dir->pair, (const lfs_block_t[2]){0, 1}) == 0 &&
dir->rev % 16 == 0) {
if (lfs->cfg->block_cycles && dir->rev % lfs->cfg->block_cycles == 0) {
if (lfs_pair_cmp(dir->pair, (const lfs_block_t[2]){0, 1}) == 0) {
// we're writing too much to the superblock, should we expand?
lfs_ssize_t res = lfs_fs_size(lfs);
if (res < 0) {
@@ -1038,18 +1065,18 @@ static int lfs_dir_compact(lfs_t *lfs,
// do we have enough space to expand?
if (res < lfs->cfg->block_count/2) {
expanding = (lfs_pair_cmp(dir->pair, lfs->root) != 0);
LFS_DEBUG("Expanding superblock at rev %"PRIu32, dir->rev);
ack = 0;
exhausted = (lfs_pair_cmp(dir->pair, lfs->root) != 0);
goto split;
}
} else {
// we're writing too much, time to relocate
exhausted = true;
goto relocate;
}
}
while (true) {
// last complete id
ack = -1;
dir->count = end - begin;
if (true) {
// erase block to write to
int err = lfs_bd_erase(lfs, dir->pair[1]);
if (err) {
@@ -1143,7 +1170,6 @@ static int lfs_dir_compact(lfs_t *lfs,
dir->off = commit.off;
dir->etag = commit.ptag;
dir->erased = true;
}
break;
split:
@@ -1157,7 +1183,7 @@ split:
}
lfs_mdir_t tail;
int err = lfs_dir_alloc(lfs, &tail);
err = lfs_dir_alloc(lfs, &tail);
if (err) {
return err;
}
@@ -1166,7 +1192,7 @@ split:
tail.tail[0] = dir->tail[0];
tail.tail[1] = dir->tail[1];
err = lfs_dir_compact(lfs, &tail, attrs, source, ack+1-expanding, end);
err = lfs_dir_compact(lfs, &tail, attrs, source, ack+1-exhausted, end);
if (err) {
return err;
}
@@ -1178,13 +1204,12 @@ split:
continue;
relocate:
//commit was corrupted
LFS_DEBUG("Bad block at %"PRIu32,
dir->pair[1]);
// drop caches and prepare to relocate block
// commit was corrupted, drop caches and prepare to relocate block
relocated = true;
lfs_cache_drop(lfs, &lfs->pcache);
if (!exhausted) {
LFS_DEBUG("Bad block at %"PRIu32, dir->pair[1]);
}
// can't relocate superblock, filesystem is now frozen
if (lfs_pair_cmp(oldpair, (const lfs_block_t[2]){0, 1}) == 0) {
@@ -1194,7 +1219,7 @@ relocate:
// relocate half of pair
err = lfs_alloc(lfs, &dir->pair[1]);
if (err) {
if (err && (err != LFS_ERR_NOSPC && !exhausted)) {
return err;
}
@@ -1273,7 +1298,11 @@ static int lfs_dir_commit(lfs_t *lfs, lfs_mdir_t *dir,
}
}
if (dir->erased) {
while (true) {
if (!dir->erased) {
goto compact;
}
// try to commit
struct lfs_commit commit = {
.block = dir->pair[0],
@@ -1332,14 +1361,17 @@ static int lfs_dir_commit(lfs_t *lfs, lfs_mdir_t *dir,
// successful commit, update globals
lfs_global_xor(&dir->locals, &lfs->locals);
lfs_global_zero(&lfs->locals);
} else {
break;
compact:
// fall back to compaction
lfs_cache_drop(lfs, &lfs->pcache);
int err = lfs_dir_compact(lfs, dir, attrs, dir, 0, dir->count);
err = lfs_dir_compact(lfs, dir, attrs, dir, 0, dir->count);
if (err) {
return err;
}
break;
}
// update globals that are affected
@@ -1762,7 +1794,6 @@ static int lfs_ctz_extend(lfs_t *lfs,
}
LFS_ASSERT(nblock >= 2 && nblock <= lfs->cfg->block_count);
if (true) {
err = lfs_bd_erase(lfs, nblock);
if (err) {
if (err == LFS_ERR_CORRUPT) {
@@ -1837,7 +1868,6 @@ static int lfs_ctz_extend(lfs_t *lfs,
*block = nblock;
*off = 4*skips;
return 0;
}
relocate:
LFS_DEBUG("Bad block at %"PRIu32, nblock);
@@ -2205,7 +2235,7 @@ int lfs_file_sync(lfs_t *lfs, lfs_file_t *file) {
type = LFS_TYPE_INLINESTRUCT;
buffer = file->cache.buffer;
size = file->ctz.size;
} else if (lfs_tole32(0x11223344) == 0x11223344) {
} else {
// update the ctz reference
type = LFS_TYPE_CTZSTRUCT;
// copy ctz so alloc will work during a relocate
@@ -3148,17 +3178,13 @@ static int32_t lfs_fs_parent(lfs_t *lfs, const lfs_block_t pair[2],
}
// search for both orderings so we can reuse the find function
lfs_block_t child[2] = {pair[0], pair[1]};
lfs_pair_tole32(child);
for (int i = 0; i < 2; i++) {
int32_t tag = lfs_dir_find(lfs, parent,
(const lfs_block_t[2]){0, 1}, true, 0x7fc00fff,
LFS_MKTAG(LFS_TYPE_DIRSTRUCT, 0, sizeof(child)), child);
LFS_MKTAG(LFS_TYPE_DIRSTRUCT, 0, 8), pair);
if (tag != LFS_ERR_NOENT) {
return tag;
}
lfs_pair_swap(child);
}
return LFS_ERR_NOENT;
@@ -3201,7 +3227,7 @@ static int lfs_fs_relocate(lfs_t *lfs,
}
// clean up bad block, which should now be a desync
return lfs_fs_forceconsistency(lfs);
return lfs_fs_deorphan(lfs);
}
// find pred
@@ -3227,11 +3253,7 @@ static int lfs_fs_relocate(lfs_t *lfs,
return 0;
}
static int lfs_fs_forceconsistency(lfs_t *lfs) {
if (!lfs->globals.s.deorphaned) {
LFS_DEBUG("Found orphans %"PRIu32,
lfs->globals.s.deorphaned);
static int lfs_fs_deorphan(lfs_t *lfs) {
// Fix any orphans
lfs_mdir_t pdir = {.split = true};
lfs_mdir_t dir = {.tail = {0, 1}};
@@ -3299,11 +3321,12 @@ static int lfs_fs_forceconsistency(lfs_t *lfs) {
memcpy(&pdir, &dir, sizeof(pdir));
}
// mark orphan as fixed
lfs_global_deorphaned(lfs, false);
}
// mark orphans as fixed
lfs_global_deorphaned(lfs, true);
return 0;
}
if (lfs->globals.s.moveid != 0x3ff) {
static int lfs_fs_demove(lfs_t *lfs) {
// Fix bad moves
LFS_DEBUG("Fixing move %"PRIu32" %"PRIu32" %"PRIu32,
lfs->globals.s.movepair[0],
@@ -3322,6 +3345,23 @@ static int lfs_fs_forceconsistency(lfs_t *lfs) {
if (err) {
return err;
}
return 0;
}
static int lfs_fs_forceconsistency(lfs_t *lfs) {
if (!lfs->globals.s.deorphaned) {
int err = lfs_fs_deorphan(lfs);
if (err) {
return err;
}
}
if (lfs->globals.s.moveid != 0x3ff) {
int err = lfs_fs_demove(lfs);
if (err) {
return err;
}
}
return 0;

17
lfs.h
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@@ -178,12 +178,6 @@ struct lfs_config {
// multiple of this value.
lfs_size_t prog_size;
// Size of block caches. Each cache buffers a portion of a block in RAM.
// This determines the size of the read cache, the program cache, and a
// cache per file. Larger caches can improve performance by storing more
// data. Must be a multiple of the read and program sizes.
lfs_size_t cache_size;
// Size of an erasable block. This does not impact ram consumption and
// may be larger than the physical erase size. However, this should be
// kept small as each file currently takes up an entire block.
@@ -193,6 +187,17 @@ struct lfs_config {
// Number of erasable blocks on the device.
lfs_size_t block_count;
// Number of erase cycles before we should move data to another block.
// May be zero to never move data, in which case no block-level
// wear-leveling is performed.
uint32_t block_cycles;
// Size of block caches. Each cache buffers a portion of a block in RAM.
// This determines the size of the read cache, the program cache, and a
// cache per file. Larger caches can improve performance by storing more
// data. Must be a multiple of the read and program sizes.
lfs_size_t cache_size;
// Number of blocks to lookahead during block allocation. A larger
// lookahead reduces the number of passes required to allocate a block.
// The lookahead buffer requires only 1 bit per block so it can be quite

15
tests/template.fmt
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@@ -69,10 +69,6 @@ uintmax_t test;
#define LFS_PROG_SIZE LFS_READ_SIZE
#endif
#ifndef LFS_CACHE_SIZE
#define LFS_CACHE_SIZE 64
#endif
#ifndef LFS_BLOCK_SIZE
#define LFS_BLOCK_SIZE 512
#endif
@@ -81,6 +77,14 @@ uintmax_t test;
#define LFS_BLOCK_COUNT 1024
#endif
#ifndef LFS_BLOCK_CYCLES
#define LFS_BLOCK_CYCLES 1024
#endif
#ifndef LFS_CACHE_SIZE
#define LFS_CACHE_SIZE 64
#endif
#ifndef LFS_LOOKAHEAD
#define LFS_LOOKAHEAD 128
#endif
@@ -94,9 +98,10 @@ const struct lfs_config cfg = {{
.read_size = LFS_READ_SIZE,
.prog_size = LFS_PROG_SIZE,
.cache_size = LFS_CACHE_SIZE,
.block_size = LFS_BLOCK_SIZE,
.block_count = LFS_BLOCK_COUNT,
.block_cycles = LFS_BLOCK_CYCLES,
.cache_size = LFS_CACHE_SIZE,
.lookahead = LFS_LOOKAHEAD,
}};