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authorMiles Bader <miles@gnu.org>1996-03-16 01:13:04 +0000
committerMiles Bader <miles@gnu.org>1996-03-16 01:13:04 +0000
commit2c873f17bf4130b8f2ab31517627753a13502fca (patch)
tree70f2575b01e99dbbe8222b45d15ed827e552dcdb /libstore
parentdac9327bf632eba02cd4aba1857844e69b51b82f (diff)
Formerly derive.c.~4~
Diffstat (limited to 'libstore')
-rw-r--r--libstore/derive.c36
1 files changed, 29 insertions, 7 deletions
diff --git a/libstore/derive.c b/libstore/derive.c
index 508239ad..f90138ba 100644
--- a/libstore/derive.c
+++ b/libstore/derive.c
@@ -27,23 +27,45 @@
void
_store_derive (struct store *store)
{
+ unsigned i;
off_t *runs = store->runs;
unsigned runs_len = store->runs_len;
size_t bsize = store->block_size;
/* BLOCK & SIZE */
store->blocks = 0;
- store->size = 0;
- while (runs_len > 0)
+ for (i = 0; i < runs_len; i += 2)
{
- store->size += bsize * runs[1];
- if (runs[0] >= 0)
- store->blocks += runs[1];
- runs += 2;
- runs_len -= 2;
+ store->wrap += runs[i + 1];
+ if (runs[i] >= 0)
+ store->blocks += runs[i + 1];
}
+ if (store->end == 0)
+ /* END not set; set it using the info from RUNS. */
+ store->end = store->wrap;
+ else if (store->wrap < store->end)
+ /* A wrapped disk! RUNS is repeated N times to reach END. Adjust BLOCKS
+ to include all iterations. */
+ {
+ size_t num_iters = store->end / store->wrap;
+ off_t last_part_base = num_iters * store->wrap;
+
+ store->blocks *= num_iters;
+
+ for (i = 0; i < runs_len; i += 2)
+ if (last_part_base + runs[i + 1] < store->end)
+ {
+ store->blocks += store->end - (last_part_base + runs[i + 1]);
+ break;
+ }
+ else if (runs[i] >= 0)
+ store->blocks += runs[i + 1];
+ }
+
+ store->size = store->end * bsize;
+
/* LOG2_BLOCK_SIZE */
store->log2_block_size = 0;
while ((1 << store->log2_block_size) < bsize)