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Hello!
I have the following disk setup:
1x 3TB WD
2x 2TB WD
On each disk I have created a single partition, and this partition is formatted
in BTRFS.
Then, I have setup a multidevice filesystem:
root@pc5:/media# btrfs filesystem show
Label: 'WD30EZRX-00M' uuid:
On Sun, Oct 13, 2013 at 03:02:40PM +0200, Thomas Schneider wrote:
Hello!
I have the following disk setup:
1x 3TB WD
2x 2TB WD
On each disk I have created a single partition, and this partition is
formatted in BTRFS.
Then, I have setup a multidevice filesystem:
root@pc5:/media# btrfs
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Hello,
after a power outage, I can't mount one of my btrfs fs anymore.
The mount output is:
[root@absolut ~]# mount /dev/mapper/wdb
mount: wrong fs type, bad option, bad superblock on /dev/mapper/wdb,
missing codepage or helper program, or other error
In some cases useful info is
2013/10/11 Stefan Behrens sbehr...@giantdisaster.de:
On 10/11/2013 20:35, Geyslan G. Bem wrote:
In add_inode_ref() function:
Initializes local pointers.
Reduces the logical condition with the __add_inode_ref() return
value by using only one 'goto out'.
Centralizes the exiting, ensuring
Hi.
I am seriously considering employing btrfs on my systems, particularly due
to some space-saving features that it has (namely, deduplication and
compression).
In fact, I was (a few moments ago) trying to back up some of my systems to a
2TB HD that has an ext4 filesystem and, in the middle of
The operations consist of finding matched items, adding new items and
removing items.
Signed-off-by: Liu Bo bo.li@oracle.com
---
fs/btrfs/ctree.h |9 ++
fs/btrfs/file-item.c | 210 ++
2 files changed, 219 insertions(+), 0 deletions(-)
Data deduplication is a specialized data compression technique for eliminating
duplicate copies of repeating data.[1]
This patch set is also related to Content based storage in project ideas[2].
PATCH 1 is a hang fix with deduplication on, but it's also useful without
dedup in practice use.
While removing a file with dedup extents, we could have a great number of
delayed refs pending to process, and these refs refer to droping
a ref of the extent, which is of BTRFS_DROP_DELAYED_REF type.
But in order to prevent an extent's ref count from going down to zero when
there still are
It's unnecessary to do qgroups accounting without enabling quota.
Signed-off-by: Liu Bo bo.li@oracle.com
---
fs/btrfs/ctree.c |2 +-
fs/btrfs/delayed-ref.c | 18 ++
fs/btrfs/qgroup.c |3 +++
3 files changed, 18 insertions(+), 5 deletions(-)
diff --git
This introduces dedup state and relative operations to mark and unmark
the dedup data range, it'll be used in later patches.
Signed-off-by: Liu Bo bo.li@oracle.com
---
fs/btrfs/extent_io.c | 14 ++
fs/btrfs/extent_io.h |5 +
2 files changed, 19 insertions(+), 0
When we have data deduplication on, we'll hang on the merge part
because it needs to verify every queued delayed data refs related to
this disk offset but we may have millions refs.
And in the case of delayed data refs, we don't usually have too much
data refs to merge.
So it's safe to shut it
This adds a dedup flag and dedup hash into ordered extent so that
we can insert dedup extents to dedup tree at endio time.
The benefit is simplicity, we don't need to fall back to cleanup dedup
structures if the write is cancelled for some reasons.
Signed-off-by: Liu Bo bo.li@oracle.com
---
The way how we process delayed refs is
1) get a bunch of head refs,
2) pick up one head ref,
3) go one node back for any delayed ref updates.
The head ref is also linked in the same rbtree as the delayed ref is,
so in 1) stage, we have to walk one by one including not only head refs, but
delayed
If the ordered extent had an IOERR or something else went wrong we need to
return the space for this ordered extent back to the allocator, but if the
extent is marked as a dedup one, we don't free the space because we just
use the existing space instead of allocating new space.
Signed-off-by: Liu
This is a preparation step for online/inband dedup tree.
It introduces dedup tree and its relatives, including hash driver and
some structures.
Signed-off-by: Liu Bo bo.li@oracle.com
---
fs/btrfs/ctree.h | 73 ++
fs/btrfs/disk-io.c
So far we have 4 commands to control dedup behaviour,
- btrfs dedup enable
Create the dedup tree, and it's the very first step when you're going to use
the dedup feature.
- btrfs dedup disable
Delete the dedup tree, after this we're not able to use dedup any more unless
you enable it again.
-
This adds deduplication subcommands, 'btrfs dedup command path',
including enable/disable/on/off.
- btrfs dedup enable
Create the dedup tree, and it's the very first step when you're going to use
the dedup feature.
- btrfs dedup disable
Delete the dedup tree, after this we're not able to use
The dedup reference is a special kind of delayed refs, and the delayed refs
are batched to be processed later.
If we find a matched dedup extent, then we queue an ADD delayed ref on it during
endio work, but there is already a DROP delayed ref queued there,
t1 t2
The dedup ref is quite a special one, it is just used to store the hash value
of the extent and cannot be used to find data, so we skip it during backref
walking.
Signed-off-by: Liu Bo bo.li@oracle.com
---
fs/btrfs/backref.c|9 +
fs/btrfs/relocation.c |3 +++
2 files
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