I try to take a snapshot of a single directory, e.g. root:> btrfsctl -s root.2010-01-12 /rootoperation complete Btrfs v0.19-4-gab8fb4c-dirty Then I take look what''s inside the newly created snapshot:> ls -l /root.2010-01-12/total 0 drwxr-xr-x 1 root root 1192 2010-01-03 20:32:12 bin drwxr-xr-x 1 root root 76 2009-06-25 0:40:35 boot drwxr-xr-x 1 root root 1756 2010-01-12 2:33:07 cmds drwxr-xr-x 1 root root 0 2010-01-06 12:21:46 data drwxr-xr-x 1 root root 4356 2010-01-12 2:07:00 dev drwxr-xr-x 1 root root 42 2010-01-04 12:29:45 downloads drwxr-xr-x 1 root root 4528 2010-01-12 2:12:12 etc drwxr-xr-x 1 root root 52 2010-01-11 12:57:47 home drwxr-xr-x 1 root root 0 2007-11-10 4:44:07 initrd drwxr-xr-x 1 root root 4490 2010-01-05 20:15:53 lib drwxr-xr-x 1 root root 124 2008-04-27 14:53:39 mnt drwxr-xr-x 1 root root 62 2008-01-08 0:21:58 net drwxr-xr-x 1 root root 0 2008-04-09 3:19:16 objects drwxr-xr-x 1 root root 316 2009-12-28 23:23:13 opt dr-xr-xr-x 1 root root 0 2007-11-10 3:35:28 proc drwxr-xr-x 1 root root 7676 2010-01-11 0:35:41 root drwxr-xr-x 1 root root 0 2010-01-12 1:56:17 save drwxr-xr-x 1 root root 0 2010-01-12 1:55:58 save2 drwxr-xr-x 1 root root 3804 2010-01-06 2:36:08 sbin drwxr-xr-x 1 root root 0 2007-11-10 3:35:28 sys drwxr-xr-x 1 root root 358 2010-01-11 18:44:29 tmp drwxr-xr-x 1 root root 176 2009-12-29 17:08:37 usr drwxr-xr-x 1 root root 72 2010-01-05 20:03:00 var It seems that always a snapshot of the root is taken instead one of the specified directory? Is this by design? Snapshotting the root works fine, but if you take several snapshots it''s a bit "recursive", because every new snapshot contains all previous snapshots. Greetings, Michael -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
In btrfs, snapshot is a clone of subvolume, not arbitrary directory. You specified ''/root'' directory and it is not subvolume, snapshot is created for parent subvolume, root of filesystem. Regards, taruisi (2010/01/12 11:12), Michael Niederle wrote:> I try to take a snapshot of a single directory, e.g. root: > >> btrfsctl -s root.2010-01-12 /root > operation complete > Btrfs v0.19-4-gab8fb4c-dirty > > Then I take look what''s inside the newly created snapshot: > >> ls -l /root.2010-01-12/ > total 0 > drwxr-xr-x 1 root root 1192 2010-01-03 20:32:12 bin > drwxr-xr-x 1 root root 76 2009-06-25 0:40:35 boot > drwxr-xr-x 1 root root 1756 2010-01-12 2:33:07 cmds > drwxr-xr-x 1 root root 0 2010-01-06 12:21:46 data > drwxr-xr-x 1 root root 4356 2010-01-12 2:07:00 dev > drwxr-xr-x 1 root root 42 2010-01-04 12:29:45 downloads > drwxr-xr-x 1 root root 4528 2010-01-12 2:12:12 etc > drwxr-xr-x 1 root root 52 2010-01-11 12:57:47 home > drwxr-xr-x 1 root root 0 2007-11-10 4:44:07 initrd > drwxr-xr-x 1 root root 4490 2010-01-05 20:15:53 lib > drwxr-xr-x 1 root root 124 2008-04-27 14:53:39 mnt > drwxr-xr-x 1 root root 62 2008-01-08 0:21:58 net > drwxr-xr-x 1 root root 0 2008-04-09 3:19:16 objects > drwxr-xr-x 1 root root 316 2009-12-28 23:23:13 opt > dr-xr-xr-x 1 root root 0 2007-11-10 3:35:28 proc > drwxr-xr-x 1 root root 7676 2010-01-11 0:35:41 root > drwxr-xr-x 1 root root 0 2010-01-12 1:56:17 save > drwxr-xr-x 1 root root 0 2010-01-12 1:55:58 save2 > drwxr-xr-x 1 root root 3804 2010-01-06 2:36:08 sbin > drwxr-xr-x 1 root root 0 2007-11-10 3:35:28 sys > drwxr-xr-x 1 root root 358 2010-01-11 18:44:29 tmp > drwxr-xr-x 1 root root 176 2009-12-29 17:08:37 usr > drwxr-xr-x 1 root root 72 2010-01-05 20:03:00 var > > It seems that always a snapshot of the root is taken instead one of the > specified directory? Is this by design? > > Snapshotting the root works fine, but if you take several snapshots it''s a bit > "recursive", because every new snapshot contains all previous snapshots. > > Greetings, Michael > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html-- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tuesday 12 January 2010 03.19:34 TARUISI Hiroaki wrote:> In btrfs, snapshot is a clone of subvolume, not arbitrary > directory. > You specified ''/root'' directory and it is not subvolume, > snapshot is created for parent subvolume, root of filesystem.... hence my proposal (haven''t seen a comment so far) to have snapshot creation fail if the specified directory is not a subvol root. cheers -- vbi> > Regards, > taruisi > > (2010/01/12 11:12), Michael Niederle wrote: > > I try to take a snapshot of a single directory, e.g. root: > >> btrfsctl -s root.2010-01-12 /root > > > > operation complete > > Btrfs v0.19-4-gab8fb4c-dirty > > > > Then I take look what''s inside the newly created snapshot: > >> ls -l /root.2010-01-12/ > > > > total 0 > > drwxr-xr-x 1 root root 1192 2010-01-03 20:32:12 bin > > drwxr-xr-x 1 root root 76 2009-06-25 0:40:35 boot > > drwxr-xr-x 1 root root 1756 2010-01-12 2:33:07 cmds > > drwxr-xr-x 1 root root 0 2010-01-06 12:21:46 data > > drwxr-xr-x 1 root root 4356 2010-01-12 2:07:00 dev > > drwxr-xr-x 1 root root 42 2010-01-04 12:29:45 downloads > > drwxr-xr-x 1 root root 4528 2010-01-12 2:12:12 etc > > drwxr-xr-x 1 root root 52 2010-01-11 12:57:47 home > > drwxr-xr-x 1 root root 0 2007-11-10 4:44:07 initrd > > drwxr-xr-x 1 root root 4490 2010-01-05 20:15:53 lib > > drwxr-xr-x 1 root root 124 2008-04-27 14:53:39 mnt > > drwxr-xr-x 1 root root 62 2008-01-08 0:21:58 net > > drwxr-xr-x 1 root root 0 2008-04-09 3:19:16 objects > > drwxr-xr-x 1 root root 316 2009-12-28 23:23:13 opt > > dr-xr-xr-x 1 root root 0 2007-11-10 3:35:28 proc > > drwxr-xr-x 1 root root 7676 2010-01-11 0:35:41 root > > drwxr-xr-x 1 root root 0 2010-01-12 1:56:17 save > > drwxr-xr-x 1 root root 0 2010-01-12 1:55:58 save2 > > drwxr-xr-x 1 root root 3804 2010-01-06 2:36:08 sbin > > drwxr-xr-x 1 root root 0 2007-11-10 3:35:28 sys > > drwxr-xr-x 1 root root 358 2010-01-11 18:44:29 tmp > > drwxr-xr-x 1 root root 176 2009-12-29 17:08:37 usr > > drwxr-xr-x 1 root root 72 2010-01-05 20:03:00 var > > > > It seems that always a snapshot of the root is taken instead one of the > > specified directory? Is this by design? > > > > Snapshotting the root works fine, but if you take several snapshots > > it''s a bit "recursive", because every new snapshot contains all > > previous snapshots. > > > > Greetings, Michael > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" > > in the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >-- Most scientists think that the not-fossil theory is a red herring; indeed, they think that oil is lots of herrings (and other things) compacted over time into sticky black mud. -- Prospect Magazine, March 2003, p. 6
Did I get you right in that btrfs does not support snapshots of an arbitrary directory? Regards, Andrey On Tue, Jan 12, 2010 at 5:19 AM, TARUISI Hiroaki <taruishi.hiroak@jp.fujitsu.com> wrote:> In btrfs, snapshot is a clone of subvolume, not arbitrary > directory. > You specified ''/root'' directory and it is not subvolume, > snapshot is created for parent subvolume, root of filesystem. > > Regards, > taruisi > > (2010/01/12 11:12), Michael Niederle wrote: >> I try to take a snapshot of a single directory, e.g. root: >> >>> btrfsctl -s root.2010-01-12 /root >> operation complete >> Btrfs v0.19-4-gab8fb4c-dirty >> >> Then I take look what''s inside the newly created snapshot: >> >>> ls -l /root.2010-01-12/ >> total 0 >> drwxr-xr-x 1 root root 1192 2010-01-03 20:32:12 bin >> drwxr-xr-x 1 root root 76 2009-06-25 0:40:35 boot >> drwxr-xr-x 1 root root 1756 2010-01-12 2:33:07 cmds >> drwxr-xr-x 1 root root 0 2010-01-06 12:21:46 data >> drwxr-xr-x 1 root root 4356 2010-01-12 2:07:00 dev >> drwxr-xr-x 1 root root 42 2010-01-04 12:29:45 downloads >> drwxr-xr-x 1 root root 4528 2010-01-12 2:12:12 etc >> drwxr-xr-x 1 root root 52 2010-01-11 12:57:47 home >> drwxr-xr-x 1 root root 0 2007-11-10 4:44:07 initrd >> drwxr-xr-x 1 root root 4490 2010-01-05 20:15:53 lib >> drwxr-xr-x 1 root root 124 2008-04-27 14:53:39 mnt >> drwxr-xr-x 1 root root 62 2008-01-08 0:21:58 net >> drwxr-xr-x 1 root root 0 2008-04-09 3:19:16 objects >> drwxr-xr-x 1 root root 316 2009-12-28 23:23:13 opt >> dr-xr-xr-x 1 root root 0 2007-11-10 3:35:28 proc >> drwxr-xr-x 1 root root 7676 2010-01-11 0:35:41 root >> drwxr-xr-x 1 root root 0 2010-01-12 1:56:17 save >> drwxr-xr-x 1 root root 0 2010-01-12 1:55:58 save2 >> drwxr-xr-x 1 root root 3804 2010-01-06 2:36:08 sbin >> drwxr-xr-x 1 root root 0 2007-11-10 3:35:28 sys >> drwxr-xr-x 1 root root 358 2010-01-11 18:44:29 tmp >> drwxr-xr-x 1 root root 176 2009-12-29 17:08:37 usr >> drwxr-xr-x 1 root root 72 2010-01-05 20:03:00 var >> >> It seems that always a snapshot of the root is taken instead one of the >> specified directory? Is this by design? >> >> Snapshotting the root works fine, but if you take several snapshots it''s a bit >> "recursive", because every new snapshot contains all previous snapshots. >> >> Greetings, Michael >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >-- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Yes. I mean that. In detail, ''non subvolume directory'' may be more precise than ''arbitrary directory''. Thanks for your description. Regards, taruisi (2010/01/14 4:04), Andrey Kuzmin wrote:> Did I get you right in that btrfs does not support snapshots of an > arbitrary directory? > > Regards, > Andrey > > > > > On Tue, Jan 12, 2010 at 5:19 AM, TARUISI Hiroaki > <taruishi.hiroak@jp.fujitsu.com> wrote: >> In btrfs, snapshot is a clone of subvolume, not arbitrary >> directory. >> You specified ''/root'' directory and it is not subvolume, >> snapshot is created for parent subvolume, root of filesystem. >> >> Regards, >> taruisi >> >> (2010/01/12 11:12), Michael Niederle wrote: >>> I try to take a snapshot of a single directory, e.g. root: >>> >>>> btrfsctl -s root.2010-01-12 /root >>> operation complete >>> Btrfs v0.19-4-gab8fb4c-dirty >>> >>> Then I take look what''s inside the newly created snapshot: >>> >>>> ls -l /root.2010-01-12/ >>> total 0 >>> drwxr-xr-x 1 root root 1192 2010-01-03 20:32:12 bin >>> drwxr-xr-x 1 root root 76 2009-06-25 0:40:35 boot >>> drwxr-xr-x 1 root root 1756 2010-01-12 2:33:07 cmds >>> drwxr-xr-x 1 root root 0 2010-01-06 12:21:46 data >>> drwxr-xr-x 1 root root 4356 2010-01-12 2:07:00 dev >>> drwxr-xr-x 1 root root 42 2010-01-04 12:29:45 downloads >>> drwxr-xr-x 1 root root 4528 2010-01-12 2:12:12 etc >>> drwxr-xr-x 1 root root 52 2010-01-11 12:57:47 home >>> drwxr-xr-x 1 root root 0 2007-11-10 4:44:07 initrd >>> drwxr-xr-x 1 root root 4490 2010-01-05 20:15:53 lib >>> drwxr-xr-x 1 root root 124 2008-04-27 14:53:39 mnt >>> drwxr-xr-x 1 root root 62 2008-01-08 0:21:58 net >>> drwxr-xr-x 1 root root 0 2008-04-09 3:19:16 objects >>> drwxr-xr-x 1 root root 316 2009-12-28 23:23:13 opt >>> dr-xr-xr-x 1 root root 0 2007-11-10 3:35:28 proc >>> drwxr-xr-x 1 root root 7676 2010-01-11 0:35:41 root >>> drwxr-xr-x 1 root root 0 2010-01-12 1:56:17 save >>> drwxr-xr-x 1 root root 0 2010-01-12 1:55:58 save2 >>> drwxr-xr-x 1 root root 3804 2010-01-06 2:36:08 sbin >>> drwxr-xr-x 1 root root 0 2007-11-10 3:35:28 sys >>> drwxr-xr-x 1 root root 358 2010-01-11 18:44:29 tmp >>> drwxr-xr-x 1 root root 176 2009-12-29 17:08:37 usr >>> drwxr-xr-x 1 root root 72 2010-01-05 20:03:00 var >>> >>> It seems that always a snapshot of the root is taken instead one of the >>> specified directory? Is this by design? >>> >>> Snapshotting the root works fine, but if you take several snapshots it''s a bit >>> "recursive", because every new snapshot contains all previous snapshots. >>> >>> Greetings, Michael >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in >>> the body of a message to majordomo@vger.kernel.org >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >>-- taruisi -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html