[Bug 235775] [FUSE]: Reuse cached attributes, when available and valid

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235775

            Bug ID: 235775
           Summary: [FUSE]: Reuse cached attributes, when available and
                    valid
           Product: Base System
           Version: CURRENT
          Hardware: Any
               URL: https://robo.moosefs.com/support/fuse_helloworld.tgz
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: cem at freebsd.org
                CC: acid at moosefs.com, ben.rubson at gmail.com,
                    cem at freebsd.org, freebsd at moosefs.com,
                    jSML4ThWwBID69YC at protonmail.com, markj at FreeBSD.org,
                    piotr.konopelko at moosefs.com
        Depends on: 230258
            Blocks: 235773, 235774

When cached attributes are valid, save a round-trip through FUSE and return the
cached values in VOP_GETATTR.

(Ditto: use cache_enter and keep lookup dentries cached.)

This is a performance optimization rather than a correctness issue.

+++ This bug was initially created as a clone of Bug #230258 +++


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230258
[Bug 230258] [FUSE] [BUG]: Attributes caching issue
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235773
[Bug 235773] [FUSE]: Missing real support for attr/dentry cache timeouts
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235774
[Bug 235774] [FUSE]: Need to evict invalidated cache contents on
fuse_write_directbackend()
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