https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236378
Bug ID: 236378
Summary: [FUSE] fuse must set FUSE_WRITE_CACHE when writing
from the page cache
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: asom...@freebsd.org
FUSE operations all record the pid, uid, and gid of the requesting process.
Many FUSE filesystem daemons use that to authenticate accesses. Ideally, they
would only do it on FUSE_OPEN. But may daemons are internally stateless, which
requires them to authenticate operations on every operation, including
FUSE_WRITE.
However, writes that come from the page cache (such as when a fuse-backed file
is mmap()ed or when using the writeback caching strategy introduced in protocol
7.23) cannot set these fields correctly, because multiple processes may have
written to the same file. For such cases, FUSE_WRITE defines the
FUSE_WRITE_CACHE flag, which indicates to the filesystem daemon that these
fields are not valid.
fuse(4) must set this flag when issueing writes from the cache.
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