Hi,
while reading btrfs source code, I try to make sense of the various uses
of block reserves. The working theory is as follows:
1. Every operation has to reserve upfront every single byte it needs to
complete its operation fully.
2. If an operation cannot determine how much space it will
This patchset adds readonly-snapshots support. You can create a
readonly snapshot, and you can also set a snapshot (subvolume also)
readonly/writable on the fly.
A few readonly checks are added in setattr, permission, remove_xattr
and set_xattr callbacks, as well as in some ioctls.
The patchset
So we don't have to add new structures as we create more ioctls
for snapshots/subvolumes.
Now to create async snapshot, set BTRFS_SUBVOL_CREATE_SNAP_ASYNC bit
of vol_arg_v2-flags, and then call ioctl(BTRFS_IOCT_SNAP_CREATE_V2).
Signed-off-by: Li Zefan l...@cn.fujitsu.com
---
fs/btrfs/ioctl.c |
Eliminate duplicate code in btrfs_read_fs_root_no_radix() and
find_and_setup_root().
Also prepare for the next patch.
Signed-off-by: Li Zefan l...@cn.fujitsu.com
---
fs/btrfs/disk-io.c | 31 +++
1 files changed, 15 insertions(+), 16 deletions(-)
diff --git
Usage:
Set BTRFS_SUBVOL_RDONLY of btrfs_ioctl_vol_arg_v2-flags, and call
ioctl(BTRFS_I0CTL_SNAP_CREATE_V2).
Implementation:
- In disk set readonly bit of btrfs_root_item-flags, and in memory
set btrfs_root-readonly.
- Add readonly checks in btrfs_permission (inode_permission),
btrfs_setattr,
This allows us to set a snapshot or a subvolume readonly or writable
on the fly.
Usage:
Set BTRFS_SUBVOL_RDONLY of btrfs_ioctl_vol_arg_v2-flags, and then
call ioctl(BTRFS_IOCTL_SUBVOL_SETFLAGS);
Changelog for v2:
- Add _GETFLAGS ioctl.
- Check if the passed fd is the root of a subvolume.
-
This problem is found in meego testing:
http://bugs.meego.com/show_bug.cgi?id=6672
A file in btrfs is mmaped and the mmaped buffer is passed to pwrite to write to
the same page
of the same file. In btrfs_file_aio_write(), the pages is locked by
prepare_pages(). So when
btrfs_copy_from_user() is
On wed, 08 Dec 2010 08:53:55 +0900, Tsutomu Itoh wrote:
I think that the disk allocation size of each file becomes a monotone
increase
when the file is made.
But, it sometimes return to 0. Is it correct?
The # of blocks is:
stat-blocks = (inode_get_bytes(inode) +
Hi!
I'm currently writing a btrfs-rescue tool and therefor began to study the
btrfs-on-disk structures in detail.
The root tree contains a ROOT_ITEM entry for *every* subvolume in the whole
file system, but only DIR_ITEM entries for subvolumes that were created in the
root directory of the
On Thu, 2010-12-09 at 14:51 +0100, Michael Niederle wrote:
Hi!
I'm currently writing a btrfs-rescue tool and therefor began to study the
btrfs-on-disk structures in detail.
The root tree contains a ROOT_ITEM entry for *every* subvolume in the whole
file system, but only DIR_ITEM entries
Hi, Calvin!
Thanks a lot for this information and for updating the wiki!
The option works - on healthy disks ...
I will continue writing my rescue-tool. I also wrote a btrfs_subvolumes command
that displays all subvolumes of an unmounted filesystem. This helps a lot if
mounting the filesystem
Eric == Eric Paris epa...@redhat.com writes:
Eric SELinux would like to implement a new labeling behavior of newly
Eric created inodes. We currently label new inodes based on the
Eric parent and the creating process. This new behavior would also
Eric take into account the name of the new
On Wed, Dec 08, 2010 at 09:41:33PM -0700, Andreas Dilger wrote:
On 2010-12-08, at 16:07, Neil Brown wrote:
On Mon, 6 Dec 2010 11:48:45 -0500 J. Bruce Fields bfie...@redhat.com
wrote:
On Fri, Dec 03, 2010 at 04:01:44PM -0700, Andreas Dilger wrote:
Any chance we can add a -get_fsid(sb,
On Thu, 2010-12-09 at 10:05 -0500, John Stoffel wrote:
Eric == Eric Paris epa...@redhat.com writes:
So what happens when I create a file /home/john/shadow, does selinux
(or LSM in general) then run extra checks because the filename is
'shadow' in your model?
It's entirely a question of
Quoting John Stoffel (j...@stoffel.org):
Eric == Eric Paris epa...@redhat.com writes:
Eric SELinux would like to implement a new labeling behavior of newly
Eric created inodes. We currently label new inodes based on the
Eric parent and the creating process. This new behavior would also
Chris Mason chris.mason at oracle.com writes:
[...]
Build the latest tools, then:
btrfsck -s 1 /dev/xxx
btrfsck -s 2 /dev/xxx
If either of these work we have an easy way to get it mounted. Just let
me know.
Hello,
I get those parent transid verify failed errors too after a system
Excerpts from Tommy Jonsson's message of 2010-12-08 15:07:58 -0500:
Build the latest tools, then:
btrfsck -s 1 /dev/xxx
btrfsck -s 2 /dev/xxx
If either of these work we have an easy way to get it mounted. Just let
me know.
-chris
$ btrfsck -s 1 /dev/sda
using SB copy 1,
I looked though the wiki (and searched the archives) but
don't see an answer. Will btrfs support old POSIX-style ACLs
and permissions, or the new NFS/NT style ACLs like ZFS? From
the patch I saw, it seems old POSIX ACLs and permissions, but
I'd like to know for sure. (And maybe the FAQ on the
Eric == Eric Paris epa...@redhat.com writes:
Eric On Thu, 2010-12-09 at 10:05 -0500, John Stoffel wrote:
Eric == Eric Paris epa...@redhat.com writes:
So what happens when I create a file /home/john/shadow, does selinux
(or LSM in general) then run extra checks because the filename is
On Tue, Dec 07, 2010 at 09:37:20PM -0600, Jon Nelson wrote:
One difference is the location of the transaction logs (pg_xlog). In
my case, /var/lib/pgsql/data *is* mountpoint for the test volume
(actually, it's a symlink to the mount point). In your case, that is
not so. Perhaps that makes a
On Thu, Dec 09, 2010 at 12:35:35PM -0500, Wayne Pollock wrote:
I looked though the wiki (and searched the archives) but
don't see an answer. Will btrfs support old POSIX-style ACLs
and permissions, or the new NFS/NT style ACLs like ZFS? From
the patch I saw, it seems old POSIX ACLs and
On Thu, 2010-12-09 at 12:48 -0500, John Stoffel wrote:
Eric == Eric Paris epa...@redhat.com writes:
Eric On Thu, 2010-12-09 at 10:05 -0500, John Stoffel wrote:
Eric == Eric Paris epa...@redhat.com writes:
Eric This patch adds a 4th piece of information, the name of the
Eric object
This patch updates the super field to add the cache_generation member. It also
makes us set it to -1 on mkfs so any new filesystem will get the space cache
stuff turned on. Thanks,
Signed-off-by: Josef Bacik jo...@redhat.com
---
ctree.h |6 +-
utils.c |1 +
2 files changed, 6
So alot of crazy people (I'm looking at you Meego) want to use btrfs on phones
and such with small devices. Unfortunately the way we split out metadata/data
chunks it makes space usage inefficient for volumes that are smaller than
1gigabyte. So add a -M option for mixing metadata+data, and
Hello developers - Last chance to get more details on this btrfs hang
(below) before I reboot the machine. Anything I can do to gather
more data?
Linux linux 2.6.35-23-generic #40-Ubuntu SMP Wed Nov 17 22:14:33 UTC 2010
x86_64 GNU/Linux
Description: Ubuntu 10.10
Package: btrfs-tools
Status:
Hi Li,
On Thursday, 09 December, 2010, Li Zefan wrote:
This allows us to set a snapshot or a subvolume readonly or writable
on the fly.
Usage:
Set BTRFS_SUBVOL_RDONLY of btrfs_ioctl_vol_arg_v2-flags, and then
call ioctl(BTRFS_IOCTL_SUBVOL_SETFLAGS);
Changelog for v2:
- Add _GETFLAGS
On Thu, Dec 09, 2010 at 12:10:58PM -0600, Jon Nelson wrote:
You should be OK, there. Are you using encryption or no?
I had difficulty replicating the issue without encryption.
Yes, I'm using encryption. LUKS with aes-xts-plain-sha256, and then
LVM on top of LUKS.
If you can point out how
On Thu, Dec 9, 2010 at 2:13 PM, Ted Ts'o ty...@mit.edu wrote:
On Thu, Dec 09, 2010 at 12:10:58PM -0600, Jon Nelson wrote:
You should be OK, there. Are you using encryption or no?
I had difficulty replicating the issue without encryption.
Yes, I'm using encryption. LUKS with
512MB.
'free' reports 75MB, 419MB free.
I originally noticed the problem on really real hardware (thinkpad
T61p), however.
If you can easily reproduce it could you try a git bisect?
-Andi
--
a...@linux.intel.com -- Speaking for myself only.
--
To unsubscribe from this list: send the
We were incorrectly taking the async path even for the sync ioctls by
passing in transid unconditionally.
There's ample room for further cleanup here, but this keeps the fix simple.
Signed-off-by: Sage Weil s...@newdream.net
---
fs/btrfs/ioctl.c | 20 +++-
1 files changed, 11
Excerpts from Andi Kleen's message of 2010-12-09 18:16:16 -0500:
512MB.
'free' reports 75MB, 419MB free.
I originally noticed the problem on really real hardware (thinkpad
T61p), however.
If you can easily reproduce it could you try a git bisect?
Do we have a known good kernel?
On Fri, Dec 10, 2010 at 2:38 AM, Chris Mason chris.ma...@oracle.com wrote:
Excerpts from Andi Kleen's message of 2010-12-09 18:16:16 -0500:
512MB.
'free' reports 75MB, 419MB free.
I originally noticed the problem on really real hardware (thinkpad
T61p), however.
If you can easily
On Thu, Dec 9, 2010 at 5:38 PM, Chris Mason chris.ma...@oracle.com wrote:
Excerpts from Andi Kleen's message of 2010-12-09 18:16:16 -0500:
512MB.
'free' reports 75MB, 419MB free.
I originally noticed the problem on really real hardware (thinkpad
T61p), however.
If you can easily
Excerpts from Mike Fedyk's message of 2010-12-09 20:58:40 -0500:
On Thu, Dec 9, 2010 at 5:38 PM, Chris Mason chris.ma...@oracle.com wrote:
Excerpts from Andi Kleen's message of 2010-12-09 18:16:16 -0500:
512MB.
'free' reports 75MB, 419MB free.
I originally noticed the problem on
Sage Weil wrote:
We were incorrectly taking the async path even for the sync ioctls by
passing in transid unconditionally.
Ha, I fixed this accidentally in my patchset. :)
There's ample room for further cleanup here, but this keeps the fix simple.
Signed-off-by: Sage Weil
Excerpts from Li Zefan's message of 2010-12-09 21:11:25 -0500:
Sage Weil wrote:
We were incorrectly taking the async path even for the sync ioctls by
passing in transid unconditionally.
Ha, I fixed this accidentally in my patchset. :)
Thanks guys,
Unless either of you object, I'll
On Thu, 9 Dec 2010, Chris Mason wrote:
Excerpts from Li Zefan's message of 2010-12-09 21:11:25 -0500:
Sage Weil wrote:
We were incorrectly taking the async path even for the sync ioctls by
passing in transid unconditionally.
Ha, I fixed this accidentally in my patchset. :)
On Fri, Dec 10, 2010 at 02:53:30AM +0100, Matt wrote:
Try a kernel before 5a87b7a5da250c9be6d757758425dfeaf8ed3179
from the tests I've done that one showed the least or no corruption if
you count the empty /etc/env.d/03opengl as an artefact
Yes, that's a good test. Also try commit
If we had reserved some bytes in struct btrfs_ioctl_vol_args, we
wouldn't have to create a new structure for async snapshot creation.
Here we convert async snapshot ioctl to use a more generic ABI, as
we'll add more ioctls for snapshots/subvolumes in the future, readonly
snapshots for example.
+#define BTRFS_ROOT_SNAP_RDONLY (1ULL 0)
+
struct btrfs_root_item {
struct btrfs_inode_item inode;
__le64 generation;
@@ -1116,6 +1118,7 @@ struct btrfs_root {
int defrag_running;
char *name;
int in_sysfs;
+bool readonly;
Does make sense to store
On Thu, Dec 9, 2010 at 8:38 PM, Ted Ts'o ty...@mit.edu wrote:
On Fri, Dec 10, 2010 at 02:53:30AM +0100, Matt wrote:
Try a kernel before 5a87b7a5da250c9be6d757758425dfeaf8ed3179
from the tests I've done that one showed the least or no corruption if
you count the empty /etc/env.d/03opengl as
Goffredo Baroncelli wrote:
Hi Li,
On Thursday, 09 December, 2010, Li Zefan wrote:
This allows us to set a snapshot or a subvolume readonly or writable
on the fly.
Usage:
Set BTRFS_SUBVOL_RDONLY of btrfs_ioctl_vol_arg_v2-flags, and then
call ioctl(BTRFS_IOCTL_SUBVOL_SETFLAGS);
01:25, Josef Bacik wrote:
Not being able to delete an orphan item isn't a horrible thing. The worst
that
happens is the next time around we try and do the orphan cleanup and we can't
find the referenced object and just delete the item and move on. Thanks,
Would be better to add code
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