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Chris LuandDevin
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* mount: rebuild dropped directory listings on lookup Invalidation, idle eviction, and a kernel Forget all clear a directory's cached-listing flag, but only an expired listing was rebuilt on lookup — a dropped one read through per entry until a ReadDir happened to run. Track directories that once held a listing in wasCachedDirs, which survives those drops, and let ShouldRebuildExpiredDir rebuild them on the next lookup. Never-cached and read-through directories keep reading through. * mount: re-validate a stale directory section on lookup A burst of remote changes invalidates only the directory section it lands in, but nothing re-validates that section until a ReadDir runs — so a lookup-heavy workload reads through per entry indefinitely. EnsureNameFresh re-lists just the section covering the looked-up name, after which lookups in it are served from the cache again. * mount: wait for pending flush before a stale-section refresh on lookup A section refresh lists the range from the filer; without the wait a pending async flush of the looked-up entry could land after the listing and leave the refreshed section holding pre-flush metadata — the same hazard the rebuild path already waits out. * mount: bound the dropped-listing rebuild history wasCachedDirs grew one full path per directory ever cached, removed only by the read-through mark, so deleted and forgotten directories accumulated forever. Remove the record when its name is deleted, move it on rename so rebuild eligibility travels with the directory, and cap the history with FIFO eviction — past the bound an evicted directory reads through per entry, the same end state as a never-cached one. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * mount: drop oversized stale sections and back off failed refreshes A section that outgrew one refresh failed EnsureNameFresh with ErrRefreshRangeTooLarge on every lookup, repeating the multi-page listing before each per-entry read, and other refresh failures retried with no cooldown. Drop the cached listing on ErrRefreshRangeTooLarge so a later lookup rebuilds it re-tiled, as ReadDir does, and stamp the rebuild attempt on other failures so retries back off under the same cooldown the rebuild gate uses. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * mount: version hard-link sibling syncs at the committed log position * mount: tag dropped-listing queue slots so stale ones cannot evict RemovePath, MovePath, and MarkDirectoryReadThrough delete the rebuild record but leave the FIFO slot behind, so a path removed and re-cached holds two queue entries. When the stale slot reaches the front it evicts the newer record, and the directory reads through per lookup until the next listing. Tag each record with an insertion generation and only evict on a match, keeping the newer record for its own slot's turn. * mount: refresh hard-link siblings from the filer, not the cached copy Stamping a cached sibling with the mutation's version claimed that position for content that may predate it — an in-flight event with newer chunks or attributes then hits the version gate and the sibling serves stale data until a refresh. Fetch each cached sibling's entry from the filer after the commit and record the higher of the fetched and committed positions, falling back to the in-place counter patch only when the fetch itself fails. * mount: back off failed section refreshes per section, not per directory A failed refresh of one stale section marked a directory-wide attempt, so every other stale section in that directory waited out the cooldown with per-entry filer reads. Key the attempt timestamp by the section's lower bound so unrelated ranges still refresh on their own schedule. * mount: fence hard-linked entries by the group's newest write position Every path of a hard-link group reads one shared content blob, but the version gate only tracks per-path records — a sibling absent from inodeToPath got no version from the sibling sync, so a stale section refresh or event could roll the shared blob back for all of them. Record a monotonic version floor per hard-link id wherever versioned content lands, and check it in the section-refresh and event gates. * mount: keep hard-link names landing when the group floor fences content The per-group version floor rejected a delayed event's newEntry while its oldPath still applied — a rename could drop the source without adding the destination, and a section refresh could skip then mark a live link fresh. Rebase the group's current cached content onto the new path so the name lands without rolling the shared blob back, only skip refresh entries already cached, and gate the sibling refresh write under the same lock so a racing event or delete wins. * mount: rebase hard-link entries from the shared blob when no sibling is cached Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * mount: park group content on uncached hard-link names a stale refresh installs Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * mount: stale the destination section when a fenced hard-link name cannot land Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * mount: bound the sibling hard-link refresh under one request deadline Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> * mount: replace a reused-name occupant the hard-link floor would skip * mount: claim no version for a sibling counter patched without a fetch * mount: vacate a reused-name occupant without decrementing its group A sibling write can fold the occupant's filer-side unlink into the shared blob counter while the stale entry is still cached, so replacing it through the plain insert may decrement a group that no longer counts the name and drop a blob live siblings still read. Vacate the path like a rename first; the counter then only ever drifts high, which leaks a blob rather than losing shared content. * mount: keep a fetch-failed sibling's version when patching its counter The fallback marked the entry unversioned, which fences nothing — a replayed delete older than the cached content could remove a live link. Claim the version the entry already holds instead: newer in-flight events still land and correct it, older replays stay fenced. --------- Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>