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    SubjectRe: [PATCH][RFC][BUG] updating the ctime and mtime time stamps in msync()
    On Wed, 09 Jan 2008 15:50:15 EST, Rik van Riel said:

    > Could you explain (using short words and simple sentences) what the
    > exact problem is?
    > Eg.
    > 1) program mmaps file
    > 2) program writes to mmaped area
    > 3) ??? <=== this part, in equally simple words :)
    > 4) data loss

    It's like this:

    Monday 9:04AM: System boots, database server starts up, mmaps file
    Monday 9:06AM: Database server writes to mmap area, updates mtime/ctime
    Monday <many times> Database server writes to mmap area, no further update..
    Monday 11:45PM: Backup sees "file modified 9:06AM, let's back it up"
    Tuesday 9:00AM-5:00PM: Database server touches it another 5,398 times, no mtime
    Tuesday 11:45PM: Backup sees "file modified back on Monday, we backed this up..
    Wed 9:00AM-5:00PM: More updates, more not touching the mtime
    Wed 11:45PM: *yawn* It hasn't been touched in 2 days, no sense in backing it up..

    Lather, rinse, repeat....
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      Last update: 2008-01-09 22:09    [W:0.032 / U:11.044 seconds]
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