Similar to the changes where strerror(errno) was converted, continue
with the remaining cases where the argument was stored in another
variable.
The savings in object size are about 4500 bytes:
$ size btrfs.old btrfs.new
text data bss dec hex filename
805055 24248 19748 849051 cf49b btrfs.old
804527 24248 19748 848523 cf28b btrfs.new
Signed-off-by: David Sterba <dsterba@suse.com>
Some people were asking why disabling compression via properties is not
set by "none" instead. As this is purely userspace conversion to "" that
kernel accepts, let's add "none" as well for convenience.
Signed-off-by: David Sterba <dsterba@suse.com>
It's messy to use "" to disable compression. Introduce the new value "no"
which can also be used for this purpose.
Signed-off-by: Satoru Takeuchi <satoru.takeuchi@gmail.com>
[ coding style fixes ]
Signed-off-by: David Sterba <dsterba@suse.com>
props.c uses 'fprintf(stderr, "ERROR: ...")' as its error messages,
however we have generic error() function.
Signed-off-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Fix the code assigning 0 to pointer instead of NULL.
Signed-off-by: Byongho Lee <bhlee.kernel@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This function is used to change fsid and chunk_tree_uuid of a node/leaf.
The function does it without transaction protection.
This is the basis of offline uuid change.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
We use the attr version provided by system in other places already,
now we can remove dependency on the separate attr library.
Signed-off-by: David Sterba <dsterba@suse.cz>
Set string "xattr_name" 's end with '\0' so that it won't be
violated in memory.
With this fix, xfstest/btrfs/048 can pass on my box.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Filipe Manana <fdmanana@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Because the function open_file_or_dir() always opened the input file in
read/write mode (O_RDWR), we were not able to due a compression property
get against a file living in a read-only subvolume/snapshot.
Fix this by opening the file with O_RDONLY mode if we're doing a property
get.
Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
When executing 'btrfs prop get' on a file which is not compressed, return
value will always be 50 since prop_compress() return -ENOATTR.
But the codes have already check the errno to avoid unnecessary error
message, so the return value should also set to 0.
Signed-off-by: Qu Wenruo <quwenro@cn.fujitsu.com>
Reviewed-by: Filipe Manana <fdmanana@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
With this property, one can enable compression for individual files
without the need to mount the filesystem with the compress or
compress-force options, and specify the compression algorithm.
When applied against a directory, files created under that directory
will inherit the compression property.
This requires the corresponding kernel patch, which adds the support
for setting and getting properties and implements the compression
property.
Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
So that we can get the label of a mounted filesystem.
Before this change:
$ btrfs prop get /mnt/btrfs label
ERROR: object is not compatible with property
$ btrfs prop get /dev/sdb3 label
ERROR: dev /dev/sdb3 is mounted, use mount point
ERROR: failed to set/get property for object.
After this change:
$ btrfs prop get /mnt/btrfs label
label=foobar
Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
"btrfs filesystem property" is a generic interface to set/get
properties on filesystem objects (inodes/subvolumes/filesystems
/devs).
This patch adds the generic framework for properties and also
implements two properties. The first is the read-only property
for subvolumes and the second is the label property for devices.
Signed-off-by: Alexander Block <ablock84@googlemail.com>
Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
