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os/filestore: estimate omap_allocated

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Assume all of leveldb/rocksdb is omap.  This is an overestimate, but
better than nothing.

We don't populate the metadata overhead (no easy way to calculate this
that comes to mind).  And we don't populate the compression-related
fields.  It's possible we could make something up here in the VDO
case...

Signed-off-by: Sage Weil <sage@redhat.com>
This commit is contained in:
Sage Weil 2018-04-09 14:58:03 -05:00
parent 6c82e66dde
commit 186edca81e
1 changed files with 15 additions and 0 deletions
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15
src/os/filestore/FileStore.cc
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@ -745,15 +745,29 @@ int FileStore::statfs(struct store_statfs_t *buf0)
}
uint64_t bfree = buf.f_bavail * buf.f_bsize;
// assume all of leveldb/rocksdb is omap.
{
map<string,uint64_t> kv_usage;
buf0->omap_allocated += object_map->get_db()->get_estimated_size(kv_usage);
}
uint64_t thin_total, thin_avail;
if (get_vdo_utilization(vdo_fd, &thin_total, &thin_avail)) {
buf0->total = thin_total;
bfree = std::min(bfree, thin_avail);
buf0->allocated = thin_total - thin_avail;
buf0->data_stored = bfree;
} else {
buf0->total = buf.f_blocks * buf.f_bsize;
buf0->allocated = bfree;
buf0->data_stored = bfree;
}
buf0->available = bfree;
// FIXME: we don't know how to populate buf->internal_metadata; XFS doesn't
// tell us what its internal overhead is.
// Adjust for writes pending in the journal
if (journal) {
uint64_t estimate = journal->get_journal_size_estimate();
@ -762,6 +776,7 @@ int FileStore::statfs(struct store_statfs_t *buf0)
else
buf0->available = 0;
}
return 0;
}