linux-toradex.git/include/uapi/linux/btrfs.h, branch v3.19-rc6

Btrfs: return failure if btrfs_dev_replace_finishing() failed

2014-11-21T01:14:28+00:00

device replace could fail due to another running scrub process or any
other errors btrfs_scrub_dev() may hit, but this failure doesn't get
returned to userspace.

The following steps could reproduce this issue

	mkfs -t btrfs -f /dev/sdb1 /dev/sdb2
	mount /dev/sdb1 /mnt/btrfs
	while true; do btrfs scrub start -B /mnt/btrfs >/dev/null 2>&1; done &
	btrfs replace start -Bf /dev/sdb2 /dev/sdb3 /mnt/btrfs
	# if this replace succeeded, do the following and repeat until
	# you see this log in dmesg
	# BTRFS: btrfs_scrub_dev(/dev/sdb2, 2, /dev/sdb3) failed -115
	#btrfs replace start -Bf /dev/sdb3 /dev/sdb2 /mnt/btrfs

	# once you see the error log in dmesg, check return value of
	# replace
	echo $?

Introduce a new dev replace result

BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS

to catch -EINPROGRESS explicitly and return other errors directly to
userspace.

Signed-off-by: Eryu Guan 
Signed-off-by: Chris Mason

btrfs: create sprout should rename fsid on the sysfs as well

2014-06-28T20:48:44+00:00

Creating sprout will change the fsid of the mounted root.
do the same on the sysfs as well.

reproducer:
 mount /dev/sdb /btrfs (seed disk)
 btrfs dev add /dev/sdc /btrfs
 mount -o rw,remount /btrfs
 btrfs dev del /dev/sdb /btrfs
 mount /dev/sdb /btrfs

Error:
kobject_add_internal failed for fe350492-dc28-4051-a601-e017b17e6145 with -EEXIST, don't try to register things with the same name in the same directory.

Signed-off-by: Anand Jain 
Reviewed-by: David Sterba 
Signed-off-by: Chris Mason

btrfs: new ioctl TREE_SEARCH_V2

2014-06-13T16:52:19+00:00

This new ioctl call allows the user to supply a buffer of varying size in which
a tree search can store its results. This is much more flexible if you want to
receive items which are larger than the current fixed buffer of 3992 bytes or
if you want to fetch more items at once. Items larger than this buffer are for
example some of the type EXTENT_CSUM.

Signed-off-by: Gerhard Heift 
Signed-off-by: Chris Mason 
Acked-by: David Sterba

btrfs: retrieve more info from FS_INFO ioctl

2014-06-10T00:20:27+00:00

Provide the basic information about filesystem through the ioctl:
* b-tree node size (same as leaf size)
* sector size
* expected alignment of CLONE_RANGE and EXTENT_SAME ioctl arguments

Backward compatibility: if the values are 0, kernel does not provide
this information, the applications should ignore them.

Signed-off-by: David Sterba 
Signed-off-by: Chris Mason

btrfs: balance filter: add limit of processed chunks

2014-06-10T00:20:26+00:00

This started as debugging helper, to watch the effects of converting
between raid levels on multiple devices, but could be useful standalone.

In my case the usage filter was not finegrained enough and led to
converting too many chunks at once. Another example use is in connection
with drange+devid or vrange filters that allow to work with a specific
chunk or even with a chunk on a given device.

The limit filter applies last, the value of 0 means no limiting.

CC: Ilya Dryomov 
CC: Hugo Mills 
Signed-off-by: David Sterba 
Signed-off-by: Chris Mason

Revert "btrfs: add ioctl to export size of global metadata reservation"

2014-02-14T21:42:13+00:00

This reverts commit 01e219e8069516cdb98594d417b8bb8d906ed30d.

David Sterba found a different way to provide these features without adding a new
ioctl.  We haven't released any progs with this ioctl yet, so I'm taking this out
for now until we finalize things.

Signed-off-by: Chris Mason 
Signed-off-by: David Sterba 
CC: Jeff Mahoney

btrfs: add ioctl to export size of global metadata reservation

2014-01-28T21:19:28+00:00

btrfs filesystem df output will show the size of the metadata space
and how much of it is used, and the user assumes that the difference
is all usable space. Since that's not actually the case due to the
global metadata reservation, we should provide the full picture to the
user.

This patch adds an ioctl that exports the size of the global metadata
reservation so that btrfs filesystem df can report it.

Signed-off-by: Jeff Mahoney 
Signed-off-by: Josef Bacik 
Signed-off-by: Chris Mason

btrfs: add ioctls to query/change feature bits online

2014-01-28T21:19:23+00:00

There are some feature bits that require no offline setup and can
be enabled online. I've only reviewed extended irefs, but there will
probably be more.

We introduce three new ioctls:
- BTRFS_IOC_GET_SUPPORTED_FEATURES: query the kernel for supported features.
- BTRFS_IOC_GET_FEATURES: query the kernel for enabled features on a per-fs
  basis, as well as querying for which features are changeable with mounted.
- BTRFS_IOC_SET_FEATURES: change features on a per-fs basis.

We introduce two new masks per feature set (_SAFE_SET and _SAFE_CLEAR) that
allow us to define which features are safe to change at runtime.

The failure modes for BTRFS_IOC_SET_FEATURES are as follows:
- Enabling a completely unsupported feature: warns and returns -ENOTSUPP
- Enabling a feature that can only be done offline: warns and returns -EPERM

Signed-off-by: Jeff Mahoney 
Signed-off-by: Josef Bacik 
Signed-off-by: Chris Mason

Btrfs: use __u64 in exported user headers

2013-09-01T12:16:01+00:00

Signed-off-by: Mike Frysinger 
Signed-off-by: Josef Bacik 
Signed-off-by: Chris Mason

btrfs: offline dedupe

2013-09-01T12:05:00+00:00

This patch adds an ioctl, BTRFS_IOC_FILE_EXTENT_SAME which will try to
de-duplicate a list of extents across a range of files.

Internally, the ioctl re-uses code from the clone ioctl. This avoids
rewriting a large chunk of extent handling code.

Userspace passes in an array of file, offset pairs along with a length
argument. The ioctl will then (for each dedupe) do a byte-by-byte comparison
of the user data before deduping the extent. Status and number of bytes
deduped are returned for each operation.

Signed-off-by: Mark Fasheh 
Reviewed-by: Zach Brown 
Signed-off-by: Josef Bacik 
Signed-off-by: Chris Mason