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Added support for handling corrupted blocks

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This provides a limited form of wear leveling. While wear is
not actually balanced across blocks, the filesystem can recover
from corrupted blocks and extend the lifetime of a device nearly
as much as dynamic wear leveling.

For use-cases where wear is important, it would be better to use
a full form of dynamic wear-leveling at the block level. (or
consider a logging filesystem).

Corrupted block handling was simply added on top of the existing
logic in place for the filesystem, so it's a bit more noodly than
it may have to be, but it gets the work done.
This commit is contained in:
Christopher Haster
2017-05-14 12:01:45 -05:00
parent b35d761196
commit fd1da602d7
8 changed files with 634 additions and 311 deletions
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tests/template.fmt
+9 -3
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@@ -13,11 +13,17 @@ void test_log(const char *s, uintmax_t v) {{
void test_assert(const char *file, unsigned line,
const char *s, uintmax_t v, uintmax_t e) {{
static const char *last[2] = {{0, 0}};
if (v != e || !(last[0] == s || last[1] == s)) {{
static const char *last[6] = {{0, 0}};
if (v != e || !(last[0] == s || last[1] == s ||
last[2] == s || last[3] == s ||
last[4] == s || last[5] == s)) {{
test_log(s, v);
last[0] = last[1];
last[1] = s;
last[1] = last[2];
last[2] = last[3];
last[3] = last[4];
last[4] = last[5];
last[5] = s;
}}
if (v != e) {{