Files with only #include directives are boring. :)
This is just a leftover after the move to the btrfs tool.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
check_extent_refs is pinning down all the corrupt tree blocks it finds,
but it is incorrectly casting these to an extent_record first.
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
If a device could not be opened in volumes.c:read_one_dev(), a
btrfs_device instance was allocated and added to the list of
devices of the fs - however this device instance had its fd,
name and label fields not initialized. This is problematic in
disk-io.c:close_all_devices() as it tried to sync, fadvise and
close the (invalid) fd of the device, and kfree() its name and
label, which pointed to random memory locations.
Thread 1 (Thread 0x7f0a3d2d1740 (LWP 23585)):
#0 __GI___libc_free (mem=0xa5a5a5a5a5a5a5a5) at malloc.c:2970
#1 0x000000000042054b in close_all_devices (fs_info=0x1e92bf0) at disk-io.c:1276
#2 0x0000000000421dcd in close_ctree (root=<optimized out>) at disk-io.c:1336
#3 0x0000000000418cfa in cmd_check (argc=<optimized out>, argv=<optimized out>) at cmds-check.c:4171
#4 0x0000000000403ed4 in main (argc=2, argv=0x7fff9a583d28) at btrfs.c:295
v2: Added Liu Bo's review mention.
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This adds a 'btrfs-image -m' option, which let us restore an image that
is built from a btrfs of multiple disks onto several disks altogether.
This aims to address the following case,
$ mkfs.btrfs -m raid0 sda sdb
$ btrfs-image sda image.file
$ btrfs-image -r image.file sdc
---------
so we can only restore metadata onto sdc, and another thing is we can
only mount sdc with degraded mode as we don't provide informations of
another disk. And, it's built as RAID0 and we have only one disk,
so after mount sdc we'll get into readonly mode.
This is just annoying for people(like me) who're trying to restore image
but turn to find they cannot make it work.
So this'll make your life easier, just tap
$ btrfs-image -m image.file sdc sdd
---------
then you get everything about metadata done, the same offset with that of
the originals(of course, you need offer enough disk size, at least the disk
size of the original disks).
Besides, this also works with raid5 and raid6 metadata image.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Otherwise we will access illegal addresses while searching on fs_uuid list.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
A device can be added to the device list without getting a name, so we may
access to illegal addresses while opening devices with their name.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
As for skinny metadata, key.offset stores levels rather than extent length.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
According to the bytenr of the extent buffer record, we can calculate the index
of the stripes, and we also know which device and where we read out the extent
buffer record, that means we can know the relationship between the device extent
and the stripes in the chunk, by this relationship, we can recover the raid0/radi10/
raid5/raid6 metadata chunk.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Add chunk rebuild for RAID1/SINGLE/DUP to chunk-recover command.
Before this patch chunk-recover can only scan and reuse the old chunk
data to recover. With this patch, chunk-recover can use the reference
between chunk/block group/dev extent to rebuild the whole chunk tree
even when old chunks are not available.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Add chunk-recover program to check or rebuild chunk tree when the system
chunk array or chunk tree is broken.
Due to the importance of the system chunk array and chunk tree, if one of
them is broken, the whole btrfs will be broken even other data are OK.
But we have some hint(fsid, checksum...) to salvage the old metadata.
So this function will first scan the whole file system and collect the
needed data(chunk/block group/dev extent), and check for the references
between them. If the references are OK, the chunk tree can be rebuilt and
luckily the file system will be mountable.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This patch adds the function to check correspondence between block group,
chunk and device extent.
Original-signed-off-by: Cheng Yang <chenyang.fnst@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
As we know, btrfs can manage several devices in the same fs, so [offset, size]
is not sufficient for unique identification of an device extent, we need the
device id to identify the device extents which have the same offset and size,
but are not in the same device. So, we added a member variant named objectid
into the extent cache, and introduced some functions to make the extent cache
be suitable to manage the device extent.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Because the fs/file roots are not extents, so it is better to use rb-tree
to manage them. Fix it.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
In fact, the code of many rb-tree insert/search/delete functions is similar,
so we can abstract them, and implement common functions for rb-tree, and then
simplify them.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Some commands(such as btrfs-convert) access the devices again after we close
the ctree, so it is better that we don't free the devices objects when the ctree
is closed, or we need re-allocate the memory for the devices. We needn't worry
the memory leak problem, because all the memory will be freed after the taskes
die.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
As we know, the file descriptor 0 is a special number, so we shouldn't
use it to initialize the file descriptor of the devices, or we might
close this special file descriptor by mistake when we close the devices.
"-1" is a better choice.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
When making btrfs filesystem. we firstly write root leaf to
specified filed, and then we recow the root. If we don't recow,
some trees are not in the correct block group.
Steps to reproduce:
dd if=/dev/zero of=test.img bs=1M count=100
mkfs.btrfs -f test.img
btrfs-debug-tree test.img
extent tree key (EXTENT_TREE ROOT_ITEM 0)
leaf 4210688 items 10 free space 3349 generation 4 owner 2
fs uuid 2e08fd93-f24d-4f44-a226-e2116fcd544f
chunk uuid dc482988-6246-46ce-9329-68bcf6d3683c
item 0 key (0 BLOCK_GROUP_ITEM 4194304) itemoff 3971 itemsize 24
block group used 12288 chunk_objectid 256 flags 2
[..snip..]
item 3 key (1138688 EXTENT_ITEM 4096) itemoff 3827 itemsize 42
extent refs 1 gen 1 flags 2
tree block key (0 UNKNOWN.0 0) level 0
item 4 key (1138688 TREE_BLOCK_REF 7) itemoff 3827 itemsize 0
tree block backref
[..snip..]
checksum tree key (CSUM_TREE ROOT_ITEM 0)
leaf 1138688 items 0 free space 3995 generation 1 owner 7
fs uuid 2e08fd93-f24d-4f44-a226-e2116fcd544f
chunk uuid dc482988-6246-46ce-9329-68bcf6d3683c
For the above example, csum root leaf comes into system block group which
is wrong,csum root leaf should be in metadata block group.
Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
I noticed that I was getting these errors on a bigger file system with more
snapshots that had been removed. This check is bogus since we won't inc
rec->found_ref if we don't find a REF_KEY _and_ a DIR_ITEM, so we only have to
worry about there being no references to a root if it actually has a root item.
If it doesn't then it's just referenced by things that will go no where anyway.
With this patch fsck no longer incorrectly complains about this file system
image I have. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
A user reported that fsck was complaining about unresolved refs for some
snapshots. You can reproduce this by doing
mkfs.btrfs /dev/sdb
mount /dev/sdb /mnt
btrfs subvol snap /mnt/ /mnt/a
btrfs subvol snap /mnt/ /mnt/b
btrfs subvol del /mnt/a
umount /mnt
btrfsck /dev/sdb
and you'd get this
unresolved ref root 258 dir 256 index 2 namelen 1 name a error 600
because snapshot b has a dir item that points to a. Except we encode in our
root ref the dirid of the ref holder, and if it doesn't match we just give it
back a empty directory since we can't hardlink directories. This makes the
check in btrfsck bogus, when we delete a we remove the ref key for it so any
lookups into /mnt/b/a will just give a blank directory as it's supposed to. Fix
this by only saying the backref is reachable if there is both a DIR_ITEM and a
REF_KEY for the given root. With this patch I no longer see errors when running
this reproducer. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
There is a problem where if we find a backref extent record first that doesn't
match a extent item we will delete some of the duplicates but not others. In
order to deal with this we need to make sure we only pay attention to duplicates
that actually have duplicate extent items. If a extent_rec has a duplicate but
the record itself doesn't have an associated extent item we promote the
duplicate to the extent record and just discard the original extent_rec since it
was just added by the backref. We copy the backref onto the promoted extent
record and then continue processing. This allowed me to fix a file system that
previously was not able to be fixed by fsck. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
The allocator looks for these hints when moving on to another block group which
will make it reset which block group it looks at, when we've already searched
that block group and didn't find any space to allocate, we need to fix this by
just letting the allocator make the determination if the block group is good
enough. This also fixes a problem where if we couldn't find space in the block
group we were given we'd just error out instead of moving on to the next block
group. Previously I couldn't fix some file systems that were relatively full,
but with this patch I can now run fsck on them with no allocation errors.
Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This fixes two bugs with the free space cache checker. First is we apparently
always use root->sectorsize for our unit in the kernel so we have to do that in
progs otherwise bitmaps turn out to not look right if we have leafsize !=
sectorsize. The second is a small issue if we had skinny metadata extents set,
we wouldn't advance last properly because we unconditionally use key.offset
instead of root->leafsize. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
In some cases the extent tree can just be so gone there is no point in trying to
figure out how to put it back together. So add a --init-extent-tree mode which
will zero out the extent tree and then re-add extents for all of the blocks we
find. This will also undo any balance that was going on at the time of the
crash, this is needed because the reloc tree seems to confuse fsck at the
moment. With this patch I can put back together a users file system that was
completely gone. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Left out a newline in the generation check printf.
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
I noticed a slight problem with btrfs-image, since it was building a chunk tree
by setting the physical offset of the stripes to the same as the logical offset
it created this problem where the super block was now mapped into the file
system differently than it was before. This isn't a huge deal except that we
also carry along the free space cache with us, which is setup with the idea that
super at physical X is at logical Y. So this would make the free space checker
in fsck freak out because it would see that the cache says that the super block
is free space, and that the area where it thought the super block was located is
in fact used. In the mount case we'd end up overwriting real metadata with
backup super blocks. So we need to maintain the physical offsets in our
stripes. This is a huge pain because we store the logical bytenrs of all of our
metadata. This patch scans the entire image looking for chunk tree blocks and
builds an in memory chunk tree so we can write logical blocks to their physical
offsets. With this patch we no longer have the problems I described above.
Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
We have a BUG_ON() in read_fs_root that expects key->offset == (u64)-1. Restore
will just pass in the location it reads out of the inode if it has a subvol
reference and pass that in, which doesn't have offset == (u64)-1, so it causes
restore blow up. This was reported in bugzilla and this patch fixed the
problem. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
The tree log bug I introduced could create inconsistent file extent entries in
the file system tree and in some worst cases even create multiple extent entries
for the same entry. To fix this we need to do a few things
1) Keep track of extent items that overlap and then pick the one that covers the
largest area and delete the rest of the items.
2) Keep track of file extent items that land in extent items but don't match
disk_bytenr/disk_num_bytes exactly. Once we find these we need to figure out
who is the right ref and then fix all of the other refs to agree.
Each of these cases require a complete rescan of all of the extents, so
unfortunately if you hit this particular problem the fsck is going to take quite
a while since it will likely rescan all the trees 2 or 3 times. With this patch
the broken file system a user sent me is fixed and a broken file system that was
created by my reproducer is also fixed. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
We've had a few users who wouldn't (or couldn't) provide us btrfs-images because
we maintain the file names when making an image. So introduce a sanitize
option. There are two uses, one that is fast and the other that is dog slow.
The fast way just generates garbage that's equal in length to the original name.
The slow way will try and find a crc32c collision for the file name that is also
the same length. Finding a crc32c collision for the file name "btrfs-progs" on
my box without CPU crc32c support takes a little more than 3 minutes, and a
little less than 2 minutes for my box that has CPU crc32c support, so it's a
lengthy and CPU intensive process.
The idea is that we use -s for most cases, and then only use -ss when we need
the file system tree to be somewhat sane. I could probably do a better job
about finding collisions, but I'll have to revist that later. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
An unfortunate side effect to my fsync bug means that anybody who didn't hit the
BUG_ON() during tree log replay would have ended up with a corrupted file
system. Currently our fsck does not catch this because it just looks for
bytenrs for backrefs, it doesn't look at the num_bytes at all. So this patch
makes us keep track of how big the backrefs are, since their disk_num_bytes
_have_ to match the number of bytes for the actual extent item. With this patch
fsck now finds problems with a file system it previously thought was ok.
Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
I hit this while working on fsck, I got some weird corruption where the number
of items was way higher than what would fit in a leaf, which would make things
blow up. This fixes the problem by catching it and returning an error so we
gracefully exit instead of segfaulting. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
See the warnings below:
[CC] btrfs-list.o
btrfs-list.c: In function 'filter_by_parent':
btrfs-list.c:1183:34: warning: cast to pointer from integer of different size
[-Wint-to-pointer-cast]
[CC] cmds-subvolume.o
cmds-subvolume.c: In function 'cmd_subvol_show':
cmds-subvolume.c:917:5: warning: cast from pointer to integer of different size
[-Wpointer-to-int-cast]
[CC] cmds-restore.o
cmds-restore.c: In function 'decompress_lzo':
cmds-restore.c:116:10: warning: passing argument 4 of 'lzo1x_decompress_safe'
from incompatible pointer type [enabled by default]
In file included from cmds-restore.c:31:0:
/usr/include/lzo/lzo1x.h:77:1: note: expected 'lzo_uint *' but argument is of
type 'size_t *'
Reported-by: Russell Coker <russell@coker.com.au>
Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Only the first byte of the wanted csum is printed:
checksum verify failed on 65536 found DA97CF61 wanted 6B
checksum verify failed on 65536 found DA97CF61 wanted 6BC3870D
Also add leading zeros to the format.
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
The patch set previously sent was sent together with the kernel part, but
was not updated as I added some reserved bytes to the ioctl struct for
future compatibility. This fixes struct btrfs_ioctl_quota_rescan_args.
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
btrfsck was blowing up when checking the free space cache when we ran xfstests
with -l 64k. That is because I was init'ing the free space ctl to whatever the
leafsize was, which isn't right for data block groups. With this patch btrfsck
no longer complains. This also fixes a tiny little typo in free-space-cache.c I
noticed while figuring this problem out. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
btrfs-image is assuming that every metadata block is the same size. The
super is a special snowflake though. It's 4K even on 64K filesystems.
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
With commit
87c09f7 Btrfs-progs: fix memory leaks on cleanup
mkfs on multiple dev is ending with segfault at
close_all_devices() during kfree(device->name)
because mkfs calls btrfs_add_to_fsid, which does not initialize
name when dev is added to the list.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Add a default rule for any btrfs-$FOO or btrfs-$FOO.static
target, allowing it to be built from btrfs-$FOO.c along with
all the normal userspace objects.
This gets rid of a lot of the cut and pasted rules for
each individual command, and as an added bonus makes it
easy to build any btrfs-$FOO statically as well, i.e.
# make btrfs-convert.static
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
For any btrfs-$FOO executable, rename the main source file from
$FOO.c to to btrfs-$FOO.c
This makes it slightly more obvious what's building what,
and allows us to write a default rule in the Makefile for
these tools.
(also add btrfs-calc-size to the list of objects to remove
on make clean)
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Several tools like btrfs-send and btrfs-receive need to map a
subvolume ID to a filesystem path. The so far existing methods
in btrfs-list.c cause a horrible effort when performing this
operation (and the effort is dependent on the number of
existing subvolumes with quadratic effort). This commit adds a
function that is able to map a subvolume ID to a filesystem path
with an effort that is independent of the number of existing
subvolumes.
In addition to this function, a command line frontend is added as well:
btrfs inspect-internal subvolid-resolve <subvolid> <path>
Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
For the objectid and offset field of a key, print -1 instead of the
decimal representation of 0xffffffffffffffff. At least for me it is
more readable like this.
Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Not important at all since exit() is called afterwards and this is
not part of the library. It just makes valgrind happy and thus
allows to search for real flaws.
Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
This addresses the same issue as did:
2bd1169 btrfs-progs: root_item generation_v2 is out of sync after btrfsck
but rather than optionally updating generation_v2 based
on the size of the existing item, increase the size of the
item as needed, and unconditionally set generation_v2.
This matches the kernel code, and keeping things in sync is a
Good Thing.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Eric Sandeen