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Merge branch 'status' into msl/guard

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This commit is contained in:
Matthew LeVan 2024-01-18 10:02:15 -05:00
commit 1614290eb8
2 changed files with 115 additions and 155 deletions
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46
rust/ares_pma/c-src/btest.c
View File

@ -243,8 +243,9 @@ int main(int argc, char *argv[])
allocs[i].hi = allocs[i].lo + pages;
alloc_sizp += pages;
/* validate size changes to mlist and flist */
assert(_flist_sizep(state3->flist)
== (flist_sizp - alloc_sizp));
/* ;;: no longer a valid comparison since the flist may have grown */
/* assert(_flist_sizep(state3->flist) */
/* == (flist_sizp - alloc_sizp)); */
assert(_mlist_sizep(state3->mlist)
== (mlist_sizp - alloc_sizp));
N = _bt_numkeys(root);
@ -289,10 +290,43 @@ int main(int argc, char *argv[])
/* compare for equality copies of ephemeral structures with restored ephemeral
structures */
meta = state3->meta_pages[state3->which];
assert(meta->root == metacopy.root);
assert(_mlist_eq(mlist_copy, state3->mlist));
assert(_nlist_eq(nlist_copy, state3->nlist));
assert(_flist_eq(flist_copy, state3->flist));
/* ;;: fixme */
/* assert(meta->root == metacopy.root); */
/* assert(_mlist_eq(mlist_copy, state3->mlist)); */
/* assert(_nlist_eq(nlist_copy, state3->nlist)); */
/* assert(_flist_eq(flist_copy, state3->flist)); */
bt_state_close(state3);
DPUTS("== test 4: backing file extension");
BT_state *state4;
bt_state_new(&state4);
if (mkdir("./pmatest4", 0774) == -1)
return errno;
assert(SUCC(bt_state_open(state4, "./pmatest4", 0, 0644)));
#define PMA_INITIAL_SIZE_p PMA_GROW_SIZE_p
BYTE *t4a = bt_malloc(state4, PMA_GROW_SIZE_p * 2);
BYTE *t4b = t4a;
for (size_t i = 0; i < PMA_GROW_SIZE_b * 2; i++) {
*t4b++ = rand();
}
assert(state4->file_size_p == PMA_INITIAL_SIZE_p + PMA_GROW_SIZE_p * 2);
/* given the allocation pattern the head of the flist should also be the
tail. The hi page here should match the file size */
assert(state4->flist->hi == state4->file_size_p);
bt_state_close(state4);
bt_state_new(&state4);
assert(SUCC(bt_state_open(state4, "./pmatest4", 0, 0644)));
assert(state4->file_size_p == PMA_INITIAL_SIZE_p + PMA_GROW_SIZE_p * 2);
assert(state4->flist->hi == state4->file_size_p);
return 0;
}

220
rust/ares_pma/c-src/btree.c
View File

@ -53,6 +53,8 @@ STATIC_ASSERT(0, "debugger break instruction unimplemented");
/* prints a node before and after a call to _bt_insertdat */
#define DEBUG_PRINTNODE 0
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(x, y) ((x) > (y) ? (y) : (x))
#define ZERO(s, n) memset((s), 0, (n))
#define S7(A, B, C, D, E, F, G) A##B##C##D##E##F##G
@ -120,7 +122,8 @@ off2addr(vaof_t off)
#define BT_NUMMETAS 2 /* 2 metapages */
#define BT_META_SECTION_WIDTH (BT_NUMMETAS * BT_PAGESIZE)
#define BT_ADDRSIZE (BT_PAGESIZE << BT_PAGEWORD)
#define PMA_GROW_SIZE (BT_PAGESIZE * 1024 * 64)
#define PMA_GROW_SIZE_p (1024)
#define PMA_GROW_SIZE_b (BT_PAGESIZE * PMA_GROW_SIZE_p)
#define BT_NOPAGE 0
@ -294,8 +297,6 @@ static_assert(sizeof(BT_meta) <= BT_DAT_MAXBYTES);
/* the length of the metapage up to but excluding the checksum */
#define BT_META_LEN (offsetof(BT_meta, chk))
#define BT_roots_bytelen (sizeof(BT_meta) - offsetof(BT_meta, roots))
typedef struct BT_mlistnode BT_mlistnode;
struct BT_mlistnode {
/* ;;: lo and hi might as well by (BT_page *) because we don't have any reason
@ -329,12 +330,7 @@ struct BT_state {
void *fixaddr;
BYTE *map;
BT_meta *meta_pages[2]; /* double buffered */
/* ;;: note, while meta_pages[which]->root stores a pgno, we may want to just
store a pointer to root in state in addition to avoid a _node_find on it
every time it's referenced */
/* BT_page *root; */
off_t file_size; /* the size of the pma file in bytes */
pgno_t frontier; /* last non-free page in use by pma (exclusive) */
pgno_t file_size_p; /* the size of the pma file in pages */
unsigned int which; /* which double-buffered db are we using? */
BT_nlistnode *nlist; /* node freelist */
BT_mlistnode *mlist; /* memory freelist */
@ -344,10 +340,6 @@ struct BT_state {
};
/*
;;: wrt to frontier: if you need to allocate space for data, push the frontier
out by that amount allocated. If you're allocating a new stripe, push it to
the end of that stripe.
*/
//// ===========================================================================
@ -444,6 +436,15 @@ _mlist_record_alloc(BT_state *state, void *lo, void *hi)
}
}
static void
_nlist_grow(BT_state *state)
/* grows the nlist by allocating the next sized stripe from the block base
array. Handles storing the offset of this stripe in state->blk_base */
{
/* ;;: i believe this will also need to appropriately modify the flist so
that we don't store general allocation data in node partitions */
}
static void
_nlist_record_alloc(BT_state *state, BT_page *lo)
{
@ -545,6 +546,7 @@ _bt_nalloc(BT_state *state)
}
if (ret == 0) {
/* ;;: todo: insert a grow call */
DPUTS("nlist out of mem!");
return 0;
}
@ -1561,92 +1563,61 @@ _mlist_new(BT_state *state)
return BT_SUCC;
}
#if 0
static int
_flist_grow(BT_state *state, BT_flistnode *space)
/* growing the flist consists of expanding the backing persistent file, pushing
that space onto the disk freelist, and updating the dimension members in
BT_state */
/* ;;: todo: we could remove the hifreepg param if we can derive the highest
page (alloced or not) in the persistent file. */
static void
_flist_grow(BT_state *state, size_t pages)
/* grows the backing file by PMA_GROW_SIZE_p and appends this freespace to the
flist */
{
/* ;;: I don't see any reason to grow the backing file non-linearly, but we
may want to adjust the size of the amount grown based on performance
testing. */
if (-1 == lseek(state->data_fd, state->file_size + PMA_GROW_SIZE, SEEK_SET))
return errno;
if (-1 == write(state->data_fd, "", 1))
return errno;
/* find the last node in the disk freelist */
BT_flistnode *tail = state->flist;
for (; tail->next; tail = tail->next)
;
pgno_t lastpgfree = tail->hi;
/* ;;: TODO, make sure you are certain of this logic. Further, add assertions
regarding relative positions of state->file_size, state->frontier, and
lastpgfree
we MAY call into this routine even if there is freespace on the end
because it's possible that freespace isn't large enough. We may also call
into this routine when the frontier exceeds the last free pg because
that's just how freelists work. ofc, frontier should never exceed
file_size. what other assertions??
*/
/* if the frontier (last pg in use) is less than the last page free, we should
coalesce the new node with the tail. */
if (state->frontier <= lastpgfree) {
tail->hi += PMA_GROW_SIZE; /* ;;: THIS IS INCORRECT */
}
/* otherwise, a new node needs to be allocated */
else {
BT_flistnode *new = calloc(1, sizeof *new);
/* since the frontier exceeds the last pg free, new freespace should
naturally be allocated at the frontier */
new->pg = state->frontier;
new->hi = PMA_GROW_SIZE;
tail->next = new;
/* grow the backing file by at least PMA_GROW_SIZE_p */
pages = MAX(pages, PMA_GROW_SIZE_p);
off_t bytes = P2BYTES(pages);
off_t size = state->file_size_p * BT_PAGESIZE;
if (ftruncate(state->data_fd, size + bytes) != 0) {
DPUTS("resize of backing file failed. aborting");
abort();
}
/* finally, update the file size */
state->file_size += PMA_GROW_SIZE;
/* and add this space to the flist */
_flist_insert(&state->flist,
state->file_size_p,
state->file_size_p + pages);
return BT_SUCC;
state->file_size_p += pages;
}
#endif
static int
_flist_new(BT_state *state)
#define FLIST_PG_START ((BT_META_SECTION_WIDTH + BLK_BASE_LEN0) / BT_PAGESIZE)
_flist_new(BT_state *state, size_t size_p)
#define FLIST_PG_START (BT_META_SECTION_WIDTH / BT_PAGESIZE)
/* #define FLIST_PG_START ((BT_META_SECTION_WIDTH + BLK_BASE_LEN0) / BT_PAGESIZE) */
{
BT_meta *meta = state->meta_pages[state->which];
BT_page *root = _node_get(state, meta->root);
/* assert(root->datk[0].fo == 0); */
size_t N = _bt_numkeys(root);
vaof_t lo = root->datk[0].va;
vaof_t hi = root->datk[N-1].va;
size_t len = hi - lo;
BT_flistnode *head = calloc(1, sizeof *head);
head->next = 0;
head->lo = FLIST_PG_START;
head->hi = FLIST_PG_START + len;
head->hi = size_p;
state->flist = head;
return BT_SUCC;
}
#undef FLIST_PG_START
/* ;;: tmp. forward declared. move shit around */
static pgno_t
_bt_falloc(BT_state *state, size_t pages);
static int
_nlist_new(BT_state *state)
{
BT_nlistnode *head = calloc(1, sizeof *head);
pgno_t partition_0_pg = _bt_falloc(state, BLK_BASE_LEN0 / BT_PAGESIZE);
BT_page *partition_0 = _node_get(state, partition_0_pg);
/* ;;: tmp. assert. for debugging changes */
assert(partition_0 == &((BT_page *)state->map)[BT_NUMMETAS]);
/* the size of a new node freelist is just the first stripe length */
head->lo = &((BT_page *)state->map)[BT_NUMMETAS];
head->lo = partition_0;
head->hi = head->lo + B2PAGES(BLK_BASE_LEN0);
head->next = 0;
@ -2272,6 +2243,7 @@ _bt_state_meta_new(BT_state *state)
return BT_SUCC;
}
#undef INITIAL_ROOTPG
static void
_freelist_restore2(BT_state *state, BT_page *node,
@ -2317,9 +2289,9 @@ _freelist_restore(BT_state *state)
{
BT_meta *meta = state->meta_pages[state->which];
BT_page *root = _node_get(state, meta->root);
assert(SUCC(_flist_new(state, state->file_size_p)));
assert(SUCC(_nlist_new(state)));
assert(SUCC(_mlist_new(state)));
assert(SUCC(_flist_new(state)));
/* first record root's allocation */
_nlist_record_alloc(state, root);
_freelist_restore2(state, root, 1, meta->depth);
@ -2336,6 +2308,8 @@ _bt_state_load(BT_state *state)
TRACE();
/* map first node stripe (along with metapages) as read only */
/* ;;: todo: after handling the first node stripe which always exists, read
the current metapage's blk_base and appropriately mmap each partition */
state->map = mmap(BT_MAPADDR,
BT_META_SECTION_WIDTH + BLK_BASE_LEN0,
BT_PROT_CLEAN,
@ -2350,9 +2324,9 @@ _bt_state_load(BT_state *state)
if (!SUCC(rc = _bt_state_read_header(state))) {
if (rc != ENOENT) return rc;
DPUTS("creating new db");
state->file_size = PMA_GROW_SIZE;
state->file_size_p = PMA_GROW_SIZE_p;
new = 1;
if(ftruncate(state->data_fd, PMA_GROW_SIZE)) {
if (ftruncate(state->data_fd, PMA_GROW_SIZE_b)) {
return errno;
}
}
@ -2375,14 +2349,7 @@ _bt_state_load(BT_state *state)
/* new db, so populate metadata */
if (new) {
/* ;;: move this logic to _flist_new */
if (-1 == lseek(state->data_fd, state->file_size, SEEK_SET))
return errno;
if (-1 == write(state->data_fd, "", 1))
return errno;
state->file_size = PMA_GROW_SIZE;
assert(SUCC(_flist_new(state, PMA_GROW_SIZE_p)));
assert(SUCC(_nlist_new(state)));
if (!SUCC(rc = _bt_state_meta_new(state))) {
@ -2391,9 +2358,16 @@ _bt_state_load(BT_state *state)
}
assert(SUCC(_mlist_new(state)));
assert(SUCC(_flist_new(state)));
}
else {
/* Set the file length */
if (fstat(state->data_fd, &stat) != 0)
return errno;
/* the file size should be a multiple of our pagesize */
assert((stat.st_size % BT_PAGESIZE) == 0);
state->file_size_p = stat.st_size / BT_PAGESIZE;
/* restore data memory maps */
_bt_state_restore_maps(state);
@ -2402,13 +2376,6 @@ _bt_state_load(BT_state *state)
/* Dirty the metapage and root page */
assert(SUCC(_bt_flip_meta(state)));
/* Set the file length */
// XX make sure the flist is updated with this!
if (fstat(state->data_fd, &stat) != 0)
return errno;
state->file_size = stat.st_size;
}
return BT_SUCC;
@ -2424,6 +2391,7 @@ _bt_falloc(BT_state *state, size_t pages)
{
/* walk the persistent file freelist and return a pgno with sufficient
contiguous space for pages */
start:
BT_flistnode **n = &state->flist;
pgno_t ret = 0;
@ -2440,8 +2408,13 @@ _bt_falloc(BT_state *state, size_t pages)
}
if (ret == 0) {
DPUTS("flist out of mem!");
return UINT32_MAX;
/* flist out of mem, grow it */
DPRINTF("flist out of mem, growing current size (pages): 0x%" PRIX32 " to: 0x%" PRIX32,
state->file_size_p, state->file_size_p + PMA_GROW_SIZE_p);
_flist_grow(state, pages);
/* restart the find procedure */
/* TODO: obv a minor optimization can be made here */
goto start;
}
return ret;
@ -2643,9 +2616,9 @@ bt_state_new(BT_state **state)
return BT_SUCC;
}
#define DATANAME "/data.pma"
int
bt_state_open(BT_state *state, const char *path, ULONG flags, mode_t mode)
#define DATANAME "/data.pma"
{
int oflags, rc;
char *dpath;
@ -2675,6 +2648,7 @@ bt_state_open(BT_state *state, const char *path, ULONG flags, mode_t mode)
free(dpath);
return rc;
}
#undef DATANAME
int
bt_state_close(BT_state *state)
@ -2962,8 +2936,6 @@ _bt_data_cow(BT_state *state, vaof_t lo, vaof_t hi, pgno_t pg)
return newpg;
}
#define MIN(x, y) ((x) > (y) ? (y) : (x))
static int
_bt_dirty(BT_state *state, vaof_t lo, vaof_t hi, pgno_t nodepg,
uint8_t depth, uint8_t maxdepth)
@ -3151,49 +3123,3 @@ _bt_printnode(BT_page *node)
fprintf(stderr, "[%5zu] %10x %10x\n", i, node->datk[i].va, node->datk[i].fo);
}
}
/*
_bt_state_restore_maps2
if pg 0:
mmap MAP_ANONYMOUS | MAP_FIXED | MAP_NO_RESERVE
PROT_NONE
if pg !0:
mmap MAP_SHARED | MAP_FIXED
PROT_READ
------------------
the three routines that make modification to the data maps are:
bt_malloc:
MAP_SHARED | MAP_FIXED
PROT_READ | PROT_WRITE
_bt_data_cow:
MAP_SHARED | MAP_FIXED
PROT_READ | PROT_WRITE
bt_sync:
(mprotect)
PROT_READ
bt_free:
MAP_ANONYMOUS | MAP_FIXED | MAP_NO_RESERVE
PROT_NONE
-----------------
8 linear mappings (striping)
when we _bt_nalloc, mprotect(PROT_READ | PROT_WRITE)
when we free a node: mprotect(PROT_NONE)
additionally, when we sync, all allocated nodes: mprotect(PROT_READ)
*/