Re: [PATCH][RFC][BUG] updating the ctime and mtime time stamps in msync() | KernelTrap

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stamps in msync()

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From: <Valdis.Kletnieks@...>

To: Rik van Riel <riel@...>

Cc: Anton Salikhmetov <salikhmetov@...>, <linux-mm@...>, <linux-kernel@...>

Subject: Re: [PATCH][RFC][BUG] updating the ctime and mtime time stamps in msync()

Date: Wednesday, January 9, 2008 - 5:06 pm

On Wed, 09 Jan 2008 15:50:15 EST, Rik van Riel said:

quoted text> 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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Messages in current thread:

[PATCH][RFC][BUG] updating the ctime and mtime time stamps i..., Anton Salikhmetov, (Mon Jan 7, 1:54 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Peter Staubach, (Wed Jan 9, 5:18 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Rik van Riel, (Wed Jan 9, 4:50 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Anton Salikhmetov, (Wed Jan 9, 8:40 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Klaus S. Madsen, (Wed Jan 9, 5:01 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., , (Wed Jan 9, 5:06 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Rik van Riel, (Wed Jan 9, 6:06 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Anton Salikhmetov, (Wed Jan 9, 8:48 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Jakob Oestergaard, (Wed Jan 9, 6:33 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Rik van Riel, (Wed Jan 9, 7:41 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., , (Thu Jan 10, 4:48 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Anton Salikhmetov, (Wed Jan 9, 8:03 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Jakob Oestergaard, (Thu Jan 10, 4:51 am)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Anton Salikhmetov, (Thu Jan 10, 6:53 am)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Rik van Riel, (Thu Jan 10, 11:45 am)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Anton Salikhmetov, (Thu Jan 10, 11:56 am)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Rik van Riel, (Thu Jan 10, 12:07 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Peter Staubach, (Thu Jan 10, 12:46 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Anton Salikhmetov, (Thu Jan 10, 12:40 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Peter Staubach, (Thu Jan 10, 12:52 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Peter Staubach, (Wed Jan 9, 6:19 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Anton Salikhmetov, (Wed Jan 9, 7:32 am)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Peter Staubach, (Wed Jan 9, 5:28 pm)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Jesper Juhl, (Wed Jan 9, 10:41 am)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Anton Salikhmetov, (Wed Jan 9, 11:31 am)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Jakob Oestergaard, (Wed Jan 9, 8:22 am)

Re: [PATCH][RFC][BUG] updating the ctime and mtime time stam..., Jakob Oestergaard, (Wed Jan 9, 7:47 am)

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