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10f8b2d5b1 mount: guard peer-truncate gaps, stale append EOF, and terminal writeback refusal (#12630 )

* mount: guard append gaps over concurrent content merges

* mount: fence a writeback inode when its async publication is abandoned

A drain that gives up on a non-precondition error left the token clear, so a
reopened writeback handle could publish past the stored EOF.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* mount: fence a writeback inode when its async data flush fails

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* mount: fence the inode when its last handle drops uncommitted content

A synchronous release whose final flush fails destroys the handle's dirty
pages, while under writeback the kernel EOF already counts them.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Chris Lu <chrislusf@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

2026-11-14 01:13:37 -08:00

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Concurrent writers to one file from different mounts require `-dlm`; without it, a conflicting write fails with EIO and the file may refuse further appends until reopened after the cache drops.