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bmap: Enabled at least opportunistic bmap allocations

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This doesn't fully replace the lookahead buffer, but at least augments
it with known bmap state when available.

To be honest, this is a minimal effort hack to try to get something
benchmarkable without dealing with all the catch-22 issues that a
self-support bmap allocator would encounter (allocating blocks for the
bmap requires a bmap, oh no).

Though now that I'm writing this, maybe this is a reasonable long-term
solution? Having the lookahead buffer to fall back on solves a lot of
problems, and, realistically, it's unlikely to be a performance
bottleneck unless the user has extreme write requests (>available
storage?).

---

Also tweaked field naming to be consistent between the bmap and
lookahead buffer.
This commit is contained in:
Christopher Haster
2025-07-28 01:11:48 -05:00
parent 838a4beee1
commit 71b9ad2412
4 changed files with 172 additions and 97 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tests/test_badblocks.toml
+3 -3
View File
@@ -56,7 +56,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -2011,7 +2011,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -3968,7 +3968,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
tests/test_btree.toml
+50 -50
View File
@@ -15,7 +15,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -47,7 +47,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -91,7 +91,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -142,7 +142,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -194,7 +194,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -254,7 +254,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -317,7 +317,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -369,7 +369,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -423,7 +423,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -507,7 +507,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -577,7 +577,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -715,7 +715,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -762,7 +762,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -822,7 +822,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -896,7 +896,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -955,7 +955,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -1043,7 +1043,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -1118,7 +1118,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -1263,7 +1263,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -1321,7 +1321,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -1395,7 +1395,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -1469,7 +1469,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -1562,7 +1562,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -1643,7 +1643,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -1727,7 +1727,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -1817,7 +1817,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -1925,7 +1925,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -2077,7 +2077,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -2138,7 +2138,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -2229,7 +2229,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -2291,7 +2291,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -2471,7 +2471,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -2542,7 +2542,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -2616,7 +2616,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -2683,7 +2683,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -2767,7 +2767,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -2875,7 +2875,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -3042,7 +3042,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -3074,7 +3074,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -3133,7 +3133,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -3209,7 +3209,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -3302,7 +3302,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -3396,7 +3396,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -3473,7 +3473,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -3591,7 +3591,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -3669,7 +3669,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -3828,7 +3828,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -4008,7 +4008,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -4236,7 +4236,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);
@@ -4364,7 +4364,7 @@ code = '''
memset(lfs3.lookahead.buffer, 0, CFG->lookahead_size);
lfs3.lookahead.window = 2;
lfs3.lookahead.off = 0;
lfs3.lookahead.size = lfs3_min(8*CFG->lookahead_size,
lfs3.lookahead.known = lfs3_min(8*CFG->lookahead_size,
CFG->block_count-2);
lfs3_alloc_ckpoint(&lfs3);