Logic for atmoic/tombstone behavior; split mode.
Flesh out logic for cache directories that request new atomic and/or
tombstone clearing behaviors. Atomic directories are considered for
deletion as a single all-or-nothing unit, and tombstone directories
truncate any removed files instead of unlinking them.
Since these behaviors can be mixed together, add local tests that
quickly verify several different permutations.
Reduce memory footprint of CacheItem objects by only storing name
and pointer to parent (instead of full path). Fix ordering bug by
switching to std::stable_sort.
Add "V2_DEFY_QUOTA" flag so we can split clearing into two distinct
phases: clearing data for apps above their quotas, and then pushing
deeper by clearing data for apps below their quotas.
Test: adb shell /data/nativetest64/installd_cache_test/installd_cache_test
Bug: 34692014, 33811826
Change-Id: I156897de1d1d1c371b2b837128b2e286bf33d40d
diff --git a/cmds/installd/CacheTracker.cpp b/cmds/installd/CacheTracker.cpp
index 23c4330..9377836 100644
--- a/cmds/installd/CacheTracker.cpp
+++ b/cmds/installd/CacheTracker.cpp
@@ -20,6 +20,7 @@
#include <fts.h>
#include <sys/quota.h>
+#include <sys/xattr.h>
#include <utils/Trace.h>
#include <android-base/logging.h>
@@ -86,30 +87,59 @@
PLOG(WARNING) << "Failed to fts_open " << path;
return;
}
- // TODO: add support for "user.atomic" and "user.tombstone" xattrs
- while ((p = fts_read(fts)) != NULL) {
+ while ((p = fts_read(fts)) != nullptr) {
+ if (p->fts_level == 0) continue;
+
+ // Create tracking nodes for everything we encounter
switch (p->fts_info) {
case FTS_D:
- // Track the newest mtime of anything inside so we consider
- // deleting the directory last
- p->fts_number = p->fts_statp->st_mtime;
- break;
- case FTS_DP:
- p->fts_statp->st_mtime = p->fts_number;
-
- // Ignore the actual top-level cache directories
- if (p->fts_level == 0) break;
case FTS_DEFAULT:
case FTS_F:
case FTS_SL:
- case FTS_SLNONE:
- // TODO: optimize path memory footprint
- items.push_back(std::shared_ptr<CacheItem>(new CacheItem(nullptr, p)));
+ case FTS_SLNONE: {
+ auto item = std::shared_ptr<CacheItem>(new CacheItem(p));
+ p->fts_pointer = static_cast<void*>(item.get());
+ items.push_back(item);
+ }
+ }
- // Track the newest modified item under this tree
- p->fts_parent->fts_number =
- std::max(p->fts_parent->fts_number, p->fts_statp->st_mtime);
- break;
+ switch (p->fts_info) {
+ case FTS_D: {
+ auto item = static_cast<CacheItem*>(p->fts_pointer);
+ item->atomic |= (getxattr(p->fts_path, kXattrCacheAtomic, nullptr, 0) >= 0);
+ item->tombstone |= (getxattr(p->fts_path, kXattrCacheTombstone, nullptr, 0) >= 0);
+
+ // When atomic, immediately collect all files under tree
+ if (item->atomic) {
+ while ((p = fts_read(fts)) != nullptr) {
+ if (p->fts_info == FTS_DP && p->fts_level == item->level) break;
+ switch (p->fts_info) {
+ case FTS_D:
+ case FTS_DEFAULT:
+ case FTS_F:
+ case FTS_SL:
+ case FTS_SLNONE:
+ item->size += p->fts_statp->st_blocks * 512;
+ item->modified = std::max(item->modified, p->fts_statp->st_mtime);
+ }
+ }
+ }
+ }
+ }
+
+ // Bubble up modified time to parent
+ switch (p->fts_info) {
+ case FTS_DP:
+ case FTS_DEFAULT:
+ case FTS_F:
+ case FTS_SL:
+ case FTS_SLNONE: {
+ auto item = static_cast<CacheItem*>(p->fts_pointer);
+ auto parent = static_cast<CacheItem*>(p->fts_parent->fts_pointer);
+ if (parent) {
+ parent->modified = std::max(parent->modified, item->modified);
+ }
+ }
}
}
fts_close(fts);
@@ -137,7 +167,7 @@
}
return left->directory;
};
- std::sort(items.begin(), items.end(), cmp);
+ std::stable_sort(items.begin(), items.end(), cmp);
ATRACE_END();
}