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MaxsTechReview
a33954b8bd
* perf: answer Steam's missing-file checks on FUSE libraries from the directory cache Before creating and committing each file, the Steam client checks whether it already exists under its exact, lower-cased and folded spellings. On an SD or USB library reached through Android's FUSE layer every one of those misses is a round trip to MediaProvider (Brawlhalla: about 65,000 misses, 92 of the 161 s of preallocation and 60 of the 93 s of commit). The client already caches the listings of its steamapps directories on FUSE and keeps them exact through its own changes, inotify and a short TTL. access() now answers a name that is absent from a live listing of its directory without asking the filesystem. Directory paths match case-insensitively only when the library's filesystem folds case, and names compare case-insensitively, so an existing file is never reported missing. * fix: reuse a listing for a differently cased folder only when the whole path folds case Checking that steamapps alone folds case let a listing of one folder answer for a different folder below it whose name differs only in case. The fill now compares the listed folder with its fully case-swapped path below steamapps, so a listing is reused across case only when the filesystem folds every level. * fix(dircache): match a folded listing only below the same prefix and skip it during a tracked change * fix(linuxfs): a folder renamed or removed above a cached listing drops that listing * fix(linuxfs): watch the folders above a cached listing so a rename or removal by any process drops it * fix(linuxfs): also watch the folders above steamapps, and stop a stuck probe from hanging the tests * fix(linuxfs): a listing under a symlink or an unwatchable folder no longer answers absent lookups * fix(linuxfs): a symlink check that cannot be watched also stops absent answers * fix(linuxfs): a differently cased lookup reuses a listing only for the same folder