Messages in this thread | | | Date | Fri, 06 Sep 2002 11:35:23 +0200 | From | Helge Hafting <> | Subject | Re: invalidate_inode_pages in 2.5.32/3 |
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Chuck Lever wrote: > > On Thu, 5 Sep 2002, Andrew Morton wrote: > > > That all assumes SMP/preempt. If you're seeing these problems on > > uniproc/non-preempt then something fishy may be happening. > > sorry, forgot to mention: the system is UP, non-preemptible, high mem. > > invalidate_inode_pages isn't freeing these pages because the page count is > two. perhaps the page count semantics of one of the page cache helper > functions has changed slightly. i'm still diagnosing. > > fortunately the problem is deterministically reproducible. basic test6, > the readdir test, of 2002 connectathon test suite, fails -- either a > duplicate file entry or a missing file entry appears after some standard > file creation and removal processing in that directory. the incorrect > entries occur because the NFS client zaps the directory's page cache to > force the next reader to re-read the directory from the server. but > invalidate_inode_pages decides to leave the pages in the cache, so the > next reader gets stale cached data instead.
Perhaps this explains my nfs problem. (2.5.32/33 UP, preempt, no highmem) Soemtimes, when editing a file on nfs, the file disappears from the server. The client believes it is there until an umount+mount sequence. It doesn't happen for all files, but it is 100% reproducible for those affected.
Editing changes the directory when the editor makes a backup copy, the old directory is kept around wrongly, and so the save into the existing file silently fails because wrong directory information from cache is used?
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