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    SubjectRe: ext4 features
    Trond Myklebust wrote:

    >On Sat, 2006-07-08 at 17:04 -0400, Bill Davidsen wrote:
    >
    >
    >>No, I didn't quite mean a manual touch, but a system call to "close and
    >>set time to high resolution" for files where time uniformity is
    >>important. Consider that in most cases the inodes times are set by the
    >>host machine clock, which I close the change reflects the fileserving
    >>host idea of time. If there were a call to close a file and set the
    >>times like touch, then that could be used, for both local and network files.
    >>
    >>
    >
    >Close should never update the time since that would be a violation of
    >POSIX rules. Normally, an NFS client will never need to update the time:
    >RPC calls like WRITE, READ and SETATTR will automatically do it for us
    >whenever necessary.
    >
    >

    Let me restate this a third time in another way. What I suggest is a
    system call, NOT NAMED CLOSE, which does a close and touch. This was all
    blue sky discussion, new system calls are as valid as nanosecond
    resolution and syncronization between servers. Since this is a new call
    it is not specified by POSIX.

    And Linus has already suggested that he would accept something similar,
    when I proposed something like "noatime" mounts, which only updated
    atime and mtime on open and close, to keep metadata relevant but not
    have the overhead of constant updates.

    Actually, now that I have more free time I may revisit that idea.

    --
    bill davidsen <davidsen@tmr.com>
    CTO TMR Associates, Inc
    Doing interesting things with small computers since 1979

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