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Extended appendall to adjust bid-relative attrs, made attr-lists const again

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This adds an extra bid parameter to lfsr_rbyd_appendall so that attrs
relative to a bid can be adjusted correctly.

This allows us to make attr-lists const again, which is generally a good
things. Passing around complex mutable state is just asking for bugs.

Though since these attr-lists are generally just passed as temporary
arguments, maybe it's not that bad?
This commit is contained in:
Christopher Haster
2023-08-14 18:03:52 -05:00
parent 9b2f3cd5bb
commit f5436caf24
2 changed files with 96 additions and 80 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lfs.c
+72 -80
View File
@@ -1319,8 +1319,8 @@ typedef struct lfsr_attr {
// TODO make this const again eventually
#define LFSR_ATTRS(...) \
(lfsr_attr_t[]){__VA_ARGS__}, \
sizeof((lfsr_attr_t[]){__VA_ARGS__}) / sizeof(lfsr_attr_t)
(const lfsr_attr_t[]){__VA_ARGS__}, \
sizeof((const lfsr_attr_t[]){__VA_ARGS__}) / sizeof(lfsr_attr_t)
//struct lfsr_attr_from {
// const lfsr_rbyd_t *rbyd;
@@ -2883,7 +2883,7 @@ failed:;
}
static int lfsr_rbyd_appendall(lfs_t *lfs, lfsr_rbyd_t *rbyd,
lfs_ssize_t start_rid, lfs_ssize_t end_rid,
lfs_size_t bid, lfs_ssize_t start_rid, lfs_ssize_t end_rid,
const lfsr_attr_t *attrs, lfs_size_t attr_count) {
// append each tag to the tree
for (lfs_size_t i = 0; i < attr_count; i++) {
@@ -2925,7 +2925,7 @@ static int lfsr_rbyd_appendall(lfs_t *lfs, lfsr_rbyd_t *rbyd,
// append the attr
err = lfsr_rbyd_append(lfs, rbyd,
attrs[i].rid-lfs_smax32(start_rid, 0),
attrs[i].rid - lfs_smax32(bid, start_rid),
tag, 0, data);
if (err) {
return err;
@@ -2937,7 +2937,7 @@ static int lfsr_rbyd_appendall(lfs_t *lfs, lfsr_rbyd_t *rbyd,
LFS_ASSERT(!lfsr_tag_isinternal(attrs[i].tag));
int err = lfsr_rbyd_append(lfs, rbyd,
attrs[i].rid-lfs_smax32(start_rid, 0),
attrs[i].rid - lfs_smax32(bid, start_rid),
attrs[i].tag, attrs[i].delta, attrs[i].data);
if (err) {
return err;
@@ -3006,7 +3006,7 @@ static int lfsr_rbyd_commit(lfs_t *lfs, lfsr_rbyd_t *rbyd,
lfsr_rbyd_t rbyd_ = *rbyd;
// append each tag to the tree
int err = lfsr_rbyd_appendall(lfs, &rbyd_, -1, -1,
int err = lfsr_rbyd_appendall(lfs, &rbyd_, 0, -1, -1,
attrs, attr_count);
if (err) {
goto failed;
@@ -3849,7 +3849,7 @@ static int lfsr_btree_parent(lfs_t *lfs,
// core btree algorithm
static int lfsr_btree_commit(lfs_t *lfs,
lfsr_btree_t *btree, lfs_size_t bid, // lfs_ssize_t cutoff,
lfsr_btree_t *btree, lfs_size_t bid,
lfsr_rbyd_t *rbyd,
const lfsr_attr_t *attrs, lfs_size_t attr_count) {
// other layers should check for inlined btrees before this
@@ -3887,10 +3887,13 @@ static int lfsr_btree_commit(lfs_t *lfs,
}
}
// make a copy so we have a reference to the old trunk in case of split
lfsr_rbyd_t rbyd_ = *rbyd;
// is rbyd erased? can we sneak our commit into any remaining
// erased bytes? note that the btree limit prevents this from mutating
// other references to the rbyd
err = lfsr_rbyd_commit(lfs, rbyd, attrs, attr_count);
// erased bytes? note that the btree trunk field prevents this from
// mutating other references to the rbyd
err = lfsr_rbyd_appendall(lfs, &rbyd_, bid, -1, -1, attrs, attr_count);
if (err && err != LFS_ERR_RANGE) {
// TODO wait should we also move if there is corruption here?
return err;
@@ -3899,6 +3902,18 @@ static int lfsr_btree_commit(lfs_t *lfs,
goto compact;
}
err = lfsr_rbyd_appendcksum(lfs, &rbyd_);
if (err && err != LFS_ERR_RANGE) {
// TODO wait should we also move if there is corruption here?
return err;
}
if (err) {
goto compact;
}
// TODO do we really need to save rbyd_?
*rbyd = rbyd_;
// done?
if (pid == -1) {
break;
@@ -3914,49 +3929,31 @@ static int lfsr_btree_commit(lfs_t *lfs,
// note that since we defer merges to compaction time, we can
// end up removing an rbyd here
if (rbyd->weight == 0) {
scratch_attrs[0] = LFSR_ATTR(pid, RM, +rbyd->weight-pweight,
scratch_attrs[0] = LFSR_ATTR(
bid+pid, RM, +rbyd->weight-pweight,
BUF(scratch_buf, scratch_dsize));
attrs = scratch_attrs;
attr_count = 1;
} else {
scratch_attrs[0] = LFSR_ATTR(pid, GROW(RM), +rbyd->weight-pweight,
scratch_attrs[0] = LFSR_ATTR(
bid+pid, GROW(RM), +rbyd->weight-pweight,
NULL);
scratch_attrs[1] = LFSR_ATTR(pid+rbyd->weight-pweight, BRANCH, 0,
scratch_attrs[1] = LFSR_ATTR(
bid+pid+rbyd->weight-pweight, BRANCH, 0,
BUF(scratch_buf, scratch_dsize));
attrs = scratch_attrs;
attr_count = 2;
}
*rbyd = parent;
// cutoff = -1;
continue;
compact:;
// can't commit, try to compact
lfsr_rbyd_t rbyd_;
lfs_size_t split_rid;
// TODO
// // first check if we are a degenerate root and can be reverted to
// // an inlined btree
// //
// // This gets a bit weird since we're defering our pending
// // attributes to after the compaction. When we can/can't be inlined
// // depends on those attributes, but trying to evaluate attributes
// // is complicated and expensive.
// //
// // Instead we just let the upper layers indicate a cutoff for when
// // an rbyd can be inlined, and leave the inlining work up to the
// // upper layers.
// if (pid == -1) {
// int degenerate = lfsr_rbyd_isdegenerate(lfs, rbyd, cutoff);
// if (degenerate) {
// return degenerate;
// }
// }
// check if we're within our compaction threshold, otherwise we
// need to split
lfs_size_t split_rid;
lfs_ssize_t estimate = lfsr_rbyd_estimateall(lfs, rbyd, -1, -1,
&split_rid);
if (estimate < 0) {
@@ -3975,7 +3972,7 @@ static int lfsr_btree_commit(lfs_t *lfs,
}
// try to compact
err = lfsr_rbyd_compact(lfs, &rbyd_, 0, -1, rbyd);
err = lfsr_rbyd_compact(lfs, &rbyd_, -1, -1, rbyd);
if (err) {
LFS_ASSERT(err != LFS_ERR_RANGE);
return err;
@@ -3983,7 +3980,7 @@ static int lfsr_btree_commit(lfs_t *lfs,
// append any pending attrs, it's up to upper
// layers to make sure these always fit
err = lfsr_rbyd_appendall(lfs, &rbyd_, 0, -1,
err = lfsr_rbyd_appendall(lfs, &rbyd_, bid, -1, -1,
attrs, attr_count);
if (err) {
LFS_ASSERT(err != LFS_ERR_RANGE);
@@ -4026,21 +4023,23 @@ static int lfsr_btree_commit(lfs_t *lfs,
// note that since we defer merges to compaction time, we can
// end up removing an rbyd here
if (rbyd->weight == 0) {
scratch_attrs[0] = LFSR_ATTR(pid, RM, +rbyd->weight-pweight,
scratch_attrs[0] = LFSR_ATTR(
bid+pid, RM, +rbyd->weight-pweight,
BUF(scratch_buf, scratch_dsize));
attrs = scratch_attrs;
attr_count = 1;
} else {
scratch_attrs[0] = LFSR_ATTR(pid, GROW(RM), +rbyd->weight-pweight,
scratch_attrs[0] = LFSR_ATTR(
bid+pid, GROW(RM), +rbyd->weight-pweight,
NULL);
scratch_attrs[1] = LFSR_ATTR(pid+rbyd->weight-pweight, BRANCH, 0,
scratch_attrs[1] = LFSR_ATTR(
bid+pid+rbyd->weight-pweight, BRANCH, 0,
BUF(scratch_buf, scratch_dsize));
attrs = scratch_attrs;
attr_count = 2;
}
*rbyd = parent;
// cutoff = -1;
continue;
split:;
@@ -4071,7 +4070,7 @@ static int lfsr_btree_commit(lfs_t *lfs,
//
// upper layers should make sure this can't fail by limiting the
// maximum commit size
err = lfsr_rbyd_appendall(lfs, &rbyd_, 0, split_rid,
err = lfsr_rbyd_appendall(lfs, &rbyd_, bid, -1, bid+split_rid,
attrs, attr_count);
if (err) {
LFS_ASSERT(err != LFS_ERR_RANGE);
@@ -4096,7 +4095,7 @@ static int lfsr_btree_commit(lfs_t *lfs,
//
// upper layers should make sure this can't fail by limiting the
// maximum commit size
err = lfsr_rbyd_appendall(lfs, &sibling, split_rid, -1,
err = lfsr_rbyd_appendall(lfs, &sibling, bid, bid+split_rid, -1,
attrs, attr_count);
if (err) {
LFS_ASSERT(err != LFS_ERR_RANGE);
@@ -4145,16 +4144,20 @@ static int lfsr_btree_commit(lfs_t *lfs,
}
// prepare commit to parent, tail recursing upwards
scratch_attrs[0] = LFSR_ATTR(0, BRANCH, +rbyd_.weight,
scratch_attrs[0] = LFSR_ATTR(
bid, BRANCH, +rbyd_.weight,
BUF(scratch1_buf, scratch1_dsize));
scratch_attrs[1] = (lfsr_tag_suptype(stag) == LFSR_TAG_NAME
? LFSR_ATTR(rbyd_.weight, BNAME, +sibling.weight,
? LFSR_ATTR(
bid+rbyd_.weight, BNAME, +sibling.weight,
DATA(sdata))
: LFSR_ATTR_NOOP);
scratch_attrs[2] = (lfsr_tag_suptype(stag) == LFSR_TAG_NAME
? LFSR_ATTR(0+rbyd_.weight+sibling.weight-1, BRANCH, 0,
? LFSR_ATTR(
bid+rbyd_.weight+sibling.weight-1, BRANCH, 0,
BUF(scratch2_buf, scratch2_dsize))
: LFSR_ATTR(0+rbyd_.weight, BRANCH, +sibling.weight,
: LFSR_ATTR(
bid+rbyd_.weight, BRANCH, +sibling.weight,
BUF(scratch2_buf, scratch2_dsize)));
attrs = scratch_attrs;
attr_count = 3;
@@ -4162,21 +4165,24 @@ static int lfsr_btree_commit(lfs_t *lfs,
// yes parent? push up split
} else {
// prepare commit to parent, tail recursing upwards
scratch_attrs[0] = LFSR_ATTR(pid, GROW(RM), +rbyd_.weight-pweight,
NULL);
scratch_attrs[1] = LFSR_ATTR(pid-(pweight-1)+rbyd_.weight-1,
BRANCH, 0,
scratch_attrs[0] = LFSR_ATTR(
bid+pid, GROW(RM), +rbyd_.weight-pweight, NULL);
scratch_attrs[1] = LFSR_ATTR(
bid+pid-(pweight-1)+rbyd_.weight-1, BRANCH, 0,
BUF(scratch1_buf, scratch1_dsize));
scratch_attrs[2] = (lfsr_tag_suptype(stag) == LFSR_TAG_NAME
? LFSR_ATTR(pid-(pweight-1)+rbyd_.weight,
? LFSR_ATTR(
bid+pid-(pweight-1)+rbyd_.weight,
BNAME, +sibling.weight,
DATA(sdata))
: LFSR_ATTR_NOOP);
scratch_attrs[3] = (lfsr_tag_suptype(stag) == LFSR_TAG_NAME
? LFSR_ATTR(pid-(pweight-1)+rbyd_.weight+sibling.weight-1,
? LFSR_ATTR(
bid+pid-(pweight-1)+rbyd_.weight+sibling.weight-1,
BRANCH, 0,
BUF(scratch2_buf, scratch2_dsize))
: LFSR_ATTR(pid-(pweight-1)+rbyd_.weight,
: LFSR_ATTR(
bid+pid-(pweight-1)+rbyd_.weight,
BRANCH, +sibling.weight,
BUF(scratch2_buf, scratch2_dsize)));
attrs = scratch_attrs;
@@ -4184,7 +4190,6 @@ static int lfsr_btree_commit(lfs_t *lfs,
}
*rbyd = parent;
// cutoff = -1;
continue;
merge:;
@@ -4379,37 +4384,28 @@ static int lfsr_btree_commit(lfs_t *lfs,
}
// prepare commit to parent, tail recursing upwards
scratch_attrs[0] = LFSR_ATTR(sid, RM, -sweight, NULL);
scratch_attrs[1] = LFSR_ATTR(pid, GROW(RM), +rbyd_.weight-pweight,
NULL);
scratch_attrs[2] = LFSR_ATTR(pid+rbyd_.weight-pweight, BRANCH, 0,
scratch_attrs[0] = LFSR_ATTR(
bid+sid, RM, -sweight, NULL);
scratch_attrs[1] = LFSR_ATTR(
bid+pid, GROW(RM), +rbyd_.weight-pweight, NULL);
scratch_attrs[2] = LFSR_ATTR(
bid+pid+rbyd_.weight-pweight, BRANCH, 0,
BUF(scratch_buf, scratch_dsize));
attrs = scratch_attrs;
attr_count = 3;
}
*rbyd = parent;
// cutoff = -1;
continue;
}
// at this point rbyd should be the trunk of our tree
btree->u.r.rbyd = *rbyd;
return false;
}
// TODO avoid mutable attrs? merge this things into rbyd_appendall?
static void lfsr_btree_adjust(lfs_ssize_t bid,
lfsr_attr_t *attrs, lfs_size_t attr_count) {
for (lfs_size_t i = 0; i < attr_count; i++) {
if (attrs[i].rid != -1) {
attrs[i].rid -= bid;
}
}
return 0;
}
static int lfsr_btree_commit__(lfs_t *lfs, lfsr_btree_t *btree,
lfsr_attr_t *attrs, lfs_size_t attr_count) {
const lfsr_attr_t *attrs, lfs_size_t attr_count) {
// first find the effective bid and any changes to the number of tags
lfs_size_t bid = -1;
lfs_ssize_t tag_delta = 0;
@@ -4470,7 +4466,7 @@ static int lfsr_btree_commit__(lfs_t *lfs, lfsr_btree_t *btree,
}
// commit our attrs
err = lfsr_rbyd_appendall(lfs, &rbyd, -1, -1,
err = lfsr_rbyd_appendall(lfs, &rbyd, 0, -1, -1,
attrs, attr_count);
if (err) {
return err;
@@ -4510,10 +4506,6 @@ static int lfsr_btree_commit__(lfs_t *lfs, lfsr_btree_t *btree,
bid -= rid;
}
// TODO do this in rbyd_appendall?
// adjust our attrs
lfsr_btree_adjust(bid, attrs, attr_count);
// commit our rid into the tree, letting lfsr_btree_commit take care
// of the rest
int err = lfsr_btree_commit(lfs, btree, bid, &rbyd,
@@ -5589,7 +5581,7 @@ static int lfsr_mdir_compact_(lfs_t *lfs, lfsr_mdir_t *mdir_,
//
// upper layers should make sure this can't fail by limiting the
// maximum commit size
err = lfsr_rbyd_appendall(lfs, &mdir_->u.r.rbyd, start_rid, end_rid,
err = lfsr_rbyd_appendall(lfs, &mdir_->u.r.rbyd, 0, start_rid, end_rid,
attr1s, attr1_count);
if (err) {
LFS_ASSERT(err != LFS_ERR_RANGE);
@@ -5598,7 +5590,7 @@ static int lfsr_mdir_compact_(lfs_t *lfs, lfsr_mdir_t *mdir_,
// note we don't filter attrs from our second pending list, this
// is used for some auxiliary attrs in lfsr_mdir_commit
err = lfsr_rbyd_appendall(lfs, &mdir_->u.r.rbyd, -1, -1,
err = lfsr_rbyd_appendall(lfs, &mdir_->u.r.rbyd, 0, -1, -1,
attr2s, attr2_count);
if (err) {
LFS_ASSERT(err != LFS_ERR_RANGE);
@@ -5663,7 +5655,7 @@ static int lfsr_mdir_commit_(lfs_t *lfs, lfsr_mdir_t *mdir,
// TODO let the lower rbyd layer handle this somehow?
// mark mdir as unerased in case we fail
mdir->u.r.rbyd.eoff = lfs->cfg->block_size;
int err = lfsr_rbyd_appendall(lfs, &mdir_.u.r.rbyd, start_rid, end_rid,
int err = lfsr_rbyd_appendall(lfs, &mdir_.u.r.rbyd, 0, start_rid, end_rid,
attrs, attr_count);
if (err && err != LFS_ERR_RANGE) {
return err;
tests/test_btree.toml
+24
View File
@@ -2346,6 +2346,30 @@ code = '''
sim_weights[bid+0] = weight1;
sim_weights[bid+1] = weight2;
sim_size += 1;
// TODO rm
lfs_size_t total_weight = 0;
for (lfs_size_t j = 0; j < sim_size; j++) {
total_weight += sim_weights[j];
}
assert(lfsr_btree_weight(&btree) == total_weight);
uint8_t buffer[4];
lfsr_tag_t tag_;
lfs_size_t weight_;
for (lfs_size_t i = 0; i < sim_size; i++) {
// calculate actual bid in btree space
lfs_size_t weighted_bid = 0;
for (lfs_size_t j = 0; j < i; j++) {
weighted_bid += sim_weights[j];
}
lfsr_btree_get(&lfs, &btree, weighted_bid+sim_weights[i]-1,
&tag_, &weight_, buffer, 4) => 1;
assert(tag_ == LFSR_TAG_INLINED);
assert(weight_ == sim_weights[i]);
assert(memcmp(buffer, &sim[i], 1) == 0);
}
}
// check that btree matches sim