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Remove noisy logging about UIDs that are relying on default cache
quota of 64MiB.
Move away from yucky old statfs() and use statvfs() instead.
Test: /data/nativetest/installd_cache_test/installd_cache_test
Bug: 35812899, 35684969, 36482620
Change-Id: I3d68da97eac2ebcda489bdf9d27061cac5b3f7cc
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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
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The old clearing algorithm is very naive and it sorts all cached files
globally by modified time. This sadly lets apps gamify the system by
setting their modified times far in the future, and it's very
expensive because it requires a global filesystem traversal to free
up even the smallest amount of data.
Instead, this CL introduces a much more fair cache clearing algorithm
that deletes files from specific UIDs based on how much cache space
that UID is using proportional to the space allocated to them. This
new design has several nice properties:
-- It uses the recently added quotactl() feature to rapidly target
the apps that are using the most space.
-- We only need to traverse the filesystem for UIDs that actively
enter the crosshairs of the clearing algorithm.
-- Disciplined apps who stay under their allocated quota will be
the last to have their cached data cleared.
-- This design can be easily adapted to support additional features
such as atomic purging and tombstones.
In summary, the new algorithm is extremely efficient when freeing up
the typical small-to-medium amounts of disk space, and is only
moderately less efficient than the old algorithm when forced to clear
all cached data.
Test: builds, boots, clearing strategy looks sane
Bug: 33965858
Change-Id: I66f95089cb33f1add3f31fcf1082ab2469870fda
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