/* This Source Code Form is subject to the terms of the Mozilla Public *License,v.2.0.IfacopyoftheMPLwasnotdistributedwiththis
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// The name of the file that we use to load/save the last access time of an // origin. // XXX We should get rid of old metadata files at some point, bug 1343576. #define METADATA_FILE_NAME u".metadata" #define METADATA_TMP_FILE_NAME u".metadata-tmp" #define METADATA_V2_FILE_NAME u".metadata-v2" #define METADATA_V2_TMP_FILE_NAME u".metadata-v2-tmp"
namespace mozilla::dom::quota {
// Seconds in one day (24 * 60 * 60). Used for time based calculations across // quota manager code.
constexpr int64_t kSecPerDay = 86400;
// Seconds in one week.
constexpr int64_t kSecPerWeek = 7 * kSecPerDay;
// Default cutoff access time (in microseconds) used for temporary storage // cleanup. Corresponds to "one week ago" and is used as the threshold when // clearing non persisted zero usage origins.
constexpr int64_t aDefaultCutoffAccessTime = kSecPerWeek * PR_USEC_PER_SEC;
// Special value used when quota version is unknown or not applicable. // // This is used in the following cases: // - When loading quota info from the L1 cache (see LoadQuota) // - When reading a metadata file that hasn't yet been upgraded to include the // quota version field // - When the metadata file is missing or corrupted and must be restored // // In these situations, the quota version is effectively undefined and cannot // be trusted. const uint32_t kNoQuotaVersion = 0;
// Current version of the quota management. // // This value is written to disk when a metadata file is created for a new // (empty) origin directory or after performing a full origin directory scan. // It represents the version of quota tracking logic used to generate the // originUsage and clientUsages values. // // The version must be incremented whenever the quota management logic changes // in a way that could invalidate existing cached usage data. This includes: // - Adding a new quota client // - Removing an existing quota client // - Changing how usage is calculated or stored // - Any other change that could cause a mismatch between actual on-disk usage // and the cached originUsage/clientUsages values // // At present, it is the responsibility of patch authors and reviewers to // decide when a bump is required. However, in the future, a test will verify // the correctness of cached usage data by comparing it against real usage, // using a pre-packaged or conditioned profile. // // If you're unsure whether a bump is needed, it's safer to do one. However, // keep in mind that increasing this version will invalidate the L2 quota info // cache. When the L1 quota info cache can't be used, such as when the build ID // changes, after a crash, or on Android in general, and the L2 quota info // cache is also unavailable due to the version bump, storage initialization // will have to fall back to the slowest path: a full storage scan. const uint32_t kCurrentQuotaVersion = 1;
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