Messages in this thread | | | Date | Tue, 31 Oct 2006 21:15:02 +0100 | From | Luca Tettamanti <> | Subject | Re: Suspend to disk: do we HAVE to use swap? |
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Il Tue, Oct 31, 2006 at 08:19:37PM +0100, Rafael J. Wysocki ha scritto: > On Tuesday, 31 October 2006 20:05, Alistair John Strachan wrote: > > On Tuesday 31 October 2006 17:40, Luca Tettamanti wrote: > > > Alistair John Strachan <s0348365@sms.ed.ac.uk> ha scritto: > > > > On Tuesday 31 October 2006 06:16, Rafael J. Wysocki wrote: > > > > [snip] > > > > > > > >> However, we already have code that allows us to use swap files for the > > > >> suspend and turning a regular file into a swap file is as easy as > > > >> running 'mkswap' and 'swapon' on it. > > > > > > > > How is this feature enabled? I don't see it in 2.6.19-rc4. > > > > > > Swap files have been supported for ages. suspend-to-swapfile is very > > > new, you need a -mm kernel and userspace suspend from CVS: > > > http://suspend.sf.net > > > > I know, I use swap files, and not a partition. This has prevented me from > > using suspend to disk "for ages". ;-) > > > > Is userspace suspend REQUIRED for this feature? > > No, but unfortunately one piece is still missing: You'll need to figure out > where your swap file's header is located. > > However, if you apply the attached patch the kernel will tell you where it is > (after you do 'swapon' grep dmesg for 'swap' and use the value in the > 'offset' field).
Of course it's also possibile to use FIBMAP ioctl:
#include <stdio.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <linux/fs.h>
int main(int argc, char **argv) { int block = 0; int fd;
if (argc < 2) return 1;
fd = open(argv[1], O_RDONLY); if (fd < 0) { perror("open()"); return 1; }
if (ioctl(fd, FIBMAP, &block)) { perror("ioctl()"); return 1; }
close(fd); printf("%d\n", block);
return 0; }
Probably it's more script friendly (grepping dmesg? hmmm) ;)
Luca -- Non sempre quello che viene dopo e` progresso. Alessandro Manzoni - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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