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    SubjectRe: [PATCH -mm 1/6] swsusp: Use device and offset to intentify swap areas

    > 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 <>


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