Messages in this thread | | | Date | Thu, 21 Sep 2006 23:27:10 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH -mm 1/6] swsusp: Use device and offset to intentify swap areas |
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Hi!
> The Linux kernel handles swap files almost in the same way as it handles swap > partitions and there are only two differences between these two types of swap > areas: > (1) swap files need not be contiguous, > (2) the header of a swap file is not in the first block of the partition that > holds it. From the swsusp's point of view (1) is not a problem, because it is > already taken care of by the swap-handling code, but (2) has to be taken into > consideration. > > In principle the location of a swap file's header may be determined with the > help of appropriate filesystem driver. Unfortunately, however, it requires the > filesystem holding the swap file to be mounted, and if this filesystem is > journaled, it cannot be mounted during a resume from disk. For this reason > we need some other means by which swap areas can be identified. > > For example, to identify a swap area we can use the partition that holds the > area and the offset from the beginning of this partition at which the swap > header is located. > > The following patch allows swsusp to identify swap areas this way. It changes > swap_type_of() so that it takes an additional argument representing an offset > of the swap header within the partition represented by its first argument. > > Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
ACK.
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