The toplevel subvolume is special and the other listing code leaves it
out so we have to add several special cases to handle it. There's no
backreference so the path is built artificially. New helper
btrfs_get_toplevel_subvol is a reduced version of btrfs_get_subvol.
There's some information usually missing for the toplevel subvolume, eg.
the uuid or creation info. This has to be fixed on the mkfs side, the
other subvolumes are created by kernel.
Example:
/mnt
Name: <FS_TREE>
UUID: -
Parent UUID: -
Received UUID: -
Creation time: -
Subvolume ID: 5
Generation: 233
Gen at creation: 0
Parent ID: 0
Top level ID: 0
Flags: -
Snapshot(s):
subv1
Signed-off-by: David Sterba <dsterba@suse.com>
The utils helper is not verbose in case of an error, for now the helper
used for subvolume listing will print the error message but not
duplicate the ioctl anymore.
Signed-off-by: David Sterba <dsterba@suse.com>
It seems like bad idea to use a library name (lblkid) within generic
function name. The currently used scanning library is implementation
detail and this detail should be hidden for rest of the code.
Signed-off-by: Karel Zak <kzak@redhat.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
For RAID5, 2 devices setup is just RAID1 with more overhead.
For RAID6, 3 devices setup is RAID1 with 3 copies, not what most user
want.
So warn user at mkfs time for such case, and add explain in man pages.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
The filesystem existence on a device is manifested by the signature,
during the mkfs process we write it first and then create other
structures. Such filesystem is not valid and should not be registered
during device scan nor listed among devices from blkid.
This patch will introduce two staged creation. In the first phase, the
signature is wrong, but recognized as a partially created filesystem (by
open or scan helpers). Once we successfully create and write everything,
we fixup the signature. At this point automated scanning should find
a valid filesystem on all devices.
We can also rely on the partially created filesystem to do better error
handling during creation. We can just bail out and do not need to clean
up.
The partial signature is '!BHRfS_M', can be shown by
btrfs inspect-internal dump-super -F image
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Currently the superblock is created first, with a valid signaure, but
the rest of the filesystem is missing. When the creation process is
interrupted, the filesystem still might be considered as valid.
To prevent that, create the filesytem with an invalid signature that
would be still recognized during the mkfs process, and finalize at the
end.
Signed-off-by: David Sterba <dsterba@suse.com>
The message about discard is printed unconditionally and does not
conform to the --quite option eg. in mkfs. Consolidate the operation
flags into one argument and add support for verbosity.
Signed-off-by: David Sterba <dsterba@suse.com>
'btrfs file du' is a very useful tool to watch my system
file usage information with snapshot aware.
when trying to run following commands:
[root@localhost btrfs-progs]# btrfs file du /
Total Exclusive Set shared Filename
ERROR: Failed to lookup root id - Inappropriate ioctl for device
ERROR: cannot check space of '/': Unknown error -1
and My Filesystem looks like this:
[root@localhost btrfs-progs]# df -Th
Filesystem Type Size Used Avail Use% Mounted on
devtmpfs devtmpfs 16G 0 16G 0% /dev
tmpfs tmpfs 16G 368K 16G 1% /dev/shm
tmpfs tmpfs 16G 1.4M 16G 1% /run
tmpfs tmpfs 16G 0 16G 0% /sys/fs/cgroup
/dev/sda3 btrfs 60G 19G 40G 33% /
tmpfs tmpfs 16G 332K 16G 1% /tmp
/dev/sdc btrfs 2.8T 166G 1.7T 9% /data
/dev/sda2 xfs 2.0G 452M 1.6G 23% /boot
/dev/sda1 vfat 1.9G 11M 1.9G 1% /boot/efi
tmpfs tmpfs 3.2G 24K 3.2G 1% /run/user/1000
So I installed Btrfs as my root partition, but boot partition
can be other fs.
We can Let btrfs tool aware of this is not a btrfs file or
directory and skip those files, so that someone like me
could just run 'btrfs file du /' to scan all btrfs filesystems.
After patch, it will look like:
Total Exclusive Set shared Filename
0.00B 0.00B - //root/.bash_logout
0.00B 0.00B - //root/.bash_profile
0.00B 0.00B - //root/.bashrc
0.00B 0.00B - //root/.cshrc
0.00B 0.00B - //root/.tcshrc
This works for me to analysis system usage and analysis
performaces.
Signed-off-by: Wang Shilong <wangshilong1991@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Introduce new function, setup_temporary_extent_tree() to build a
temporary extent tree for make_btrfs_v2().
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Introduce new function, setup_temp_csum_tree(), to setup temporary
csum tree for make_btrfs_v2().
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Introudce new function, setup_temp_fs_tree(), to setup temporary fs tree
for make_btrfs_v2().
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Introduce new function, setup_temp_device_tree(), to setup temporary
device tree for make_btrfs_v2().
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Introduce new function, setup_temp_chunk_root(), to initialize temporary
chunk root for make_btrfs_v2().
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Introduce new function, setup_temp_tree_root(), to initialize temporary
tree root for make_btrfs_v2().
The new function will setup tree root at metadata chunk and ensure data
won't be written into metadata chunk.
Also, new make_btrfs_v2() will have a much better code structure than
old make_btrfs().
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Introduce a new function, setup_temp_super(), to setup temporary super
for make_btrfs_v2().
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
[ use __strncpy_null in setup_temp_super ]
Signed-off-by: David Sterba <dsterba@suse.com>
Introduce new function make_convert_btrfs() for convert.
This new function will have the following features:
1) Allocate temporary sb/metadata/system chunk, avoiding old used data
2) More structured functions
No more over 1000 lines function, better function split and code
reuse
This will finally replace current make_btrfs(), but now only used for
convert.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
David has reported some quite chaos usage of pseudo random numbers.
Like using static srand seed, or even calling rand() without setting
seed correctly.
The new pseudo random API will initialize the random seed on its first
calling and use uniformly distributed pseudo random number generator as
backend.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
[ renamed variables and functions, added prefixes ]
Signed-off-by: David Sterba <dsterba@suse.com>
To accept DUP on multidev fs, in addition to the following
commit, we need to mark DUP as an allowed data/metadata
profile.
commit 42f1279bf8e9 ("btrfs-progs: mkfs: allow DUP on multidev fs, only warn")
* actual result
=============================================
# ./mkfs.btrfs -f -m DUP -d DUP /dev/sdb1 /dev/sdb2
btrfs-progs v4.5-24-ga35b7e6
See http://btrfs.wiki.kernel.org for more information.
WARNING: DUP is not recommended on filesystem with multiple devices
ERROR: unable to create FS with metadata profile DUP (have 2 devices but 1 devices are required)
=============================================
* expected result
=============================================
# ./mkfs.btrfs -f -m dup -d dup /dev/sdb1 /dev/sdb2
WARNING: DUP is not recommended on filesystem with multiple devices
btrfs-progs v4.5-25-g1a10a3c
See http://btrfs.wiki.kernel.org for more information.
Label: (null)
UUID: 010d72ff-c87c-4516-8916-5e635719d110
Node size: 16384
Sector size: 4096
Filesystem size: 28.87GiB
Block group profiles:
Data: DUP 1.01GiB
Metadata: DUP 1.01GiB
System: DUP 12.00MiB
SSD detected: no
Incompat features: extref, skinny-metadata
Number of devices: 2
Devices:
ID SIZE PATH
1 953.00MiB /dev/sdb1
2 27.94GiB /dev/sdb2
==================================================
Signed-off-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
There's a mix of opencoded strncpy + null termination, strncpy, memcppy
without termination etc. Unify them and use the helper.
Resolves-coverity-id: 1357105
Signed-off-by: David Sterba <dsterba@suse.com>
The DUP profile can work on multiple filesystems, the limitation is
rather artificial. Let the user make the decision and print a warning.
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
[ renamed from subvol_minus_mnt to subvol_strip_mountpoint ]
Signed-off-by: David Sterba <dsterba@suse.com>
get_subvol_info() is useful as we are adding more features around
subvolume. This function was inline with the function
cmd_subvol_show().
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
The function test_issubvolume() provides the same check, and
has better logic.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
When `btrfs filesystem label /foo bar` command is invoked, it will pass
the buffer allocated in the argv array directly to set_label_mounted()
and then to the BTRFS_IOC_SET_FSLABEL ioctl.
However, the kernel code handling the ioctl will always try to copy
BTRFS_LABEL_SIZE bytes[1] from the userland pointer. Under certain
conditions and when the label is small enough, the command will fail
with:
[root@localhost /]# btrfs filesystem label /mnt f
ERROR: unable to set label Bad address
Fix this by making sure we pass a BTRFS_LABEL_SIZE sized buffer to the
ioctl containing the desired label.
[1] https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/fs/btrfs/ioctl.c?id=refs/tags/v4.5#n5231
Signed-off-by: Petros Angelatos <petrosagg@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>
