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From: Pavel Machek <pavel@ucw.cz>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nigel Cunningham <nigel@nigel.suspend2.net>,
	Pekka Enberg <penberg@cs.helsinki.fi>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: Back to the future.
Date: Fri, 27 Apr 2007 00:42:56 +0200	[thread overview]
Message-ID: <20070426224256.GB21926@elf.ucw.cz> (raw)
In-Reply-To: <alpine.LFD.0.98.0704260941310.9964@woody.linux-foundation.org>

Hi!

> I'd really suggest _just_ the "full image". Nothing else is probably ever 
> worth supporting. Your "snapshot to disk" wouldn't be _quite_ as simple as 
> "echo disk > /sys/power/state", but it should not necessarily be much 
> worse than
> 
> 	snapshot_kernel | gzip -9 > /dev/snapshot

Yep, we "freeze too much", so we can't just use the shell and pipe
it. Too bad.

  218 int write_image(char *resume_dev_name)
  219 {
  220 	static struct swap_map_handle handle;
  221 	struct swsusp_info *header;
  222 	unsigned long start;
  223 	int fd;
  224 	int error;
  225 
  226 	fd = open(resume_dev_name, O_RDWR | O_SYNC);
  227 	if (fd < 0) {
  228 		printf("suspend: Could not open resume device\n");
  229 		return error;
  230 	}
  231 	error = read(dev, buffer, PAGE_SIZE);
  232 	if (error < PAGE_SIZE)
  233 		return error < 0 ? error : -EFAULT;
  234 	header = (struct swsusp_info *)buffer;
  235 	if (!enough_swap(header->pages)) {
  236 		printf("suspend: Not enough free swap\n");
  237 		return -ENOSPC;
  238 	}
  239 	error = init_swap_writer(&handle, fd);
  240 	if (!error) {
  241 		start = handle.cur_swap;
  242 		error = swap_write_page(&handle, header);
  243 	}
  244 	if (!error)
  245 		error = save_image(&handle, header->pages - 1);
  246 	if (!error) {
  247 		flush_swap_writer(&handle);
  248 		printf( "S" );
  249 		error = mark_swap(fd, start);
  250 		printf( "|\n" );
  251 	}
  252 	fsync(fd);
  253 	close(fd);
  254 	return error;
  255 }

This is basically the loop above, made complex by the fact that we do
not want to have separate partition for snapshot; we just want to
reuse free space in swap partition.

I think you've just invented uswsusp.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

  parent reply	other threads:[~2007-04-26 22:43 UTC|newest]

Thread overview: 136+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-04-26  6:04 Back to the future Nigel Cunningham
2007-04-26  7:28 ` Pekka Enberg
     [not found]   ` <1177573348.50 25.224.camel@nigel.suspend2.net>
2007-04-26  7:42   ` Nigel Cunningham
2007-04-26  8:17     ` Pekka Enberg
2007-04-26  9:28       ` Nigel Cunningham
2007-04-26 17:29         ` Luca Tettamanti
2007-04-26 16:56     ` Linus Torvalds
2007-04-26 17:03       ` Xavier Bestel
2007-04-26 17:34         ` Linus Torvalds
2007-04-26 20:08           ` Nigel Cunningham
2007-04-26 20:45             ` Linus Torvalds
2007-04-26 20:50               ` Nigel Cunningham
2007-04-27  0:10                 ` Olivier Galibert
2007-04-27 10:21                   ` Daniel Pittman
2007-04-27 23:19                   ` Nigel Cunningham
2007-04-26 21:38             ` Theodore Tso
2007-04-27 10:10               ` Christoph Hellwig
2007-04-26 22:08             ` Rafael J. Wysocki
2007-04-26 22:20               ` Nigel Cunningham
2007-04-26 23:15               ` Linus Torvalds
2007-04-27  7:51           ` Pekka Enberg
2007-04-26 17:07       ` Linus Torvalds
2007-04-26 18:22       ` Chase Venters
2007-04-26 18:50         ` David Lang
2007-04-26 19:56       ` Nigel Cunningham
2007-04-27  4:52         ` Pekka J Enberg
2007-04-27  6:08           ` Nigel Cunningham
2007-04-27  6:18             ` Pekka J Enberg
2007-04-27  6:29               ` Pekka J Enberg
2007-04-27  6:34               ` Nigel Cunningham
2007-04-27  6:50                 ` Pekka J Enberg
2007-04-27  7:03                   ` Nigel Cunningham
2007-04-27  7:24                     ` Pekka J Enberg
2007-04-27  9:50               ` Oliver Neukum
2007-04-27 10:12                 ` Pekka J Enberg
2007-04-27 19:07                   ` Oliver Neukum
2007-04-28  9:22                     ` Pekka Enberg
2007-04-28 13:37                       ` Oliver Neukum
2007-05-03 12:06                         ` Pavel Machek
2007-05-04 21:52                           ` Indan Zupancic
2007-05-05  9:16                             ` Pavel Machek
2007-05-05 12:02                               ` Indan Zupancic
2007-04-28 10:35                   ` Rafael J. Wysocki
2007-04-28 18:43                     ` David Lang
2007-04-28 19:37                       ` Rafael J. Wysocki
2007-04-27 21:24               ` Rafael J. Wysocki
2007-04-27 21:44                 ` Linus Torvalds
2007-04-27 22:04                   ` Rafael J. Wysocki
2007-04-27 22:08                     ` Linus Torvalds
2007-04-27 22:41                       ` Rafael J. Wysocki
2007-04-27 22:26                         ` David Lang
2007-04-27 23:21                           ` Rafael J. Wysocki
2007-04-27 23:01                             ` David Lang
2007-04-28  0:02                               ` Rafael J. Wysocki
2007-04-27 23:17                         ` Linus Torvalds
2007-04-27 23:45                           ` Rafael J. Wysocki
2007-04-27 23:57                             ` Nigel Cunningham
2007-04-27 23:50                               ` David Lang
2007-04-28  0:40                                 ` Linus Torvalds
2007-04-28  6:58                                 ` Oliver Neukum
2007-04-28  9:16                                   ` Pekka J Enberg
2007-04-28 18:28                                   ` David Lang
2007-05-03 17:18                                 ` Pavel Machek
2007-05-07  2:13                                   ` David Lang
2007-05-07  3:33                                     ` Kyle Moffett
2007-05-07 12:48                                     ` Pavel Machek
2007-05-07 12:52                                       ` Oliver Neukum
2007-05-07 14:37                                         ` david
2007-05-07 19:51                                           ` Pavel Machek
2007-05-07 19:55                                             ` david
2007-05-07 20:38                                               ` Pavel Machek
2007-05-08 17:36                                                 ` Disconnect
2007-04-27 23:59                             ` Linus Torvalds
2007-04-28  0:18                               ` Linus Torvalds
2007-05-05 11:42                                 ` Pavel Machek
2007-04-28  0:50                               ` Paul Mackerras
2007-04-28  1:00                               ` Rafael J. Wysocki
2007-04-28  1:12                                 ` Linus Torvalds
2007-04-28  0:54                                   ` David Lang
2007-04-28  1:44                                   ` Rafael J. Wysocki
2007-04-28  2:51                                     ` Daniel Hazelton
2007-04-28  7:00                                       ` progress meter in s2disk (was Re: Back to the future.) Pavel Machek
2007-04-28  8:50                                     ` Back to the future Pavel Machek
2007-04-28  9:24                                       ` Rafael J. Wysocki
2007-04-28 16:28                                       ` Linus Torvalds
2007-04-28 17:50                                         ` Rafael J. Wysocki
2007-04-28 21:25                                           ` Linus Torvalds
2007-04-28 23:03                                             ` Rafael J. Wysocki
2007-04-28 23:45                                               ` Linus Torvalds
2007-04-29  0:01                                                 ` Nigel Cunningham
2007-04-29  5:01                                                   ` Bojan Smojver
2007-04-29  3:43                                                 ` Kyle Moffett
2007-04-29  8:57                                                 ` Rafael J. Wysocki
2007-04-29  8:59                                                   ` Pavel Machek
2007-04-29  9:32                                                     ` Rafael J. Wysocki
2007-04-29  8:23                                             ` Pavel Machek
2007-04-29  9:22                                               ` Rafael J. Wysocki
2007-04-28 18:32                                       ` David Lang
2007-04-28 19:14                                         ` Rafael J. Wysocki
2007-04-28 18:44                                           ` David Lang
2007-05-03 15:25                           ` Pavel Machek
2007-04-27 22:07                   ` Nigel Cunningham
2007-04-28  1:03                     ` Kyle Moffett
2007-04-28  1:15                       ` Rafael J. Wysocki
2007-04-28  0:51                         ` David Lang
2007-04-28  1:25                         ` Kyle Moffett
2007-05-03 15:10                       ` Pavel Machek
2007-05-03 16:53                         ` Kyle Moffett
2007-05-04  7:52                           ` David Greaves
2007-05-04 13:27                             ` Kyle Moffett
2007-04-28  0:18                   ` Jeremy Fitzhardinge
2007-04-28  1:00                     ` Matthew Garrett
2007-04-28  1:05                       ` Jeremy Fitzhardinge
2007-05-03 15:14                         ` Pavel Machek
2007-06-01 19:00                           ` Eric W. Biederman
2007-04-28  1:08                       ` Rafael J. Wysocki
2007-04-27 20:44           ` Rafael J. Wysocki
2007-04-28 19:09         ` Bill Davidsen
2007-04-26 22:40       ` Pavel Machek
2007-04-27  5:41         ` Pekka Enberg
2007-04-27 14:55           ` Pavel Machek
2007-04-27 21:39             ` Nigel Cunningham
2007-04-26 22:42       ` Pavel Machek [this message]
2007-04-26 22:24         ` David Lang
2007-04-26 23:12           ` Pavel Machek
2007-04-26 22:49             ` David Lang
2007-04-26 23:27               ` Pavel Machek
2007-04-26 22:56                 ` David Lang
2007-04-27  0:23               ` Olivier Galibert
2007-04-27 12:49       ` Pavel Machek
2007-04-27 21:26         ` Rafael J. Wysocki
2007-04-27 22:12           ` David Lang
2007-04-26  8:38 ` Jan Engelhardt
2007-04-26  9:33   ` Nigel Cunningham
2007-04-28  0:28 ` Bojan Smojver
     [not found] <8e5l8-7SD-21@gated-at.bofh.it>
     [not found] ` <8e6Ka-1uR-3@gated-at.bofh.it>
     [not found]   ` <8e6TS-1Id-11@gated-at.bofh.it>
     [not found]     ` <8efu9-6mF-1@gated-at.bofh.it>
     [not found]       ` <8ekWV-6FF-33@gated-at.bofh.it>
     [not found]         ` <8el6y-6Sj-5@gated-at.bofh.it>
     [not found]           ` <8elpT-7wY-21@gated-at.bofh.it>
2007-04-28 11:04             ` Bodo Eggert

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