btrfs-progs: Add a rule to build a static mkfs.btrfs

Static mkfs.btrfs can be used to "bootstrap" a system from a live CD
which does not provide mkfs.btrfs.

The executable produced is named mkfs.btrfs.static and built by invoking
the "static" make rule.

Signed-off-by: Antoine Sirinelli <antoine@monte-stello.com>
Btrfs-progs: alloc our super copy in btrfs-find-root

Dave fixed the fs_info to allocate the super copy instead of embedding it, but
he failed to notice that I open code open_ctree in btrfs-find-root so we end up
with a super that's not allocated, so we segfault whenever you try to run
btrfs-find-root.  I've fixed this up and now we don't segfault anymore.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
btrfs-progs: close fd on return from label get/set functions

Somehow missed these 2 in the last round.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
btrfs-progs: three new device/path helpers

Add 3 new helpers:

* is_block_device(), to test if a path is a block device.
* get_btrfs_mount(), to get the mountpoint of a device,
  if mounted.
* open_path_or_dev_mnt(path), to open either the pathname
  or, if it's a mounted btrfs dev, the mountpoint.  Useful
  for some commands which can take either type of arg.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
btrfs-progs: don't open-code mountpoint discovery in scrub cancel

cmd_scrub_cancel had its own mountpoint discovery routine;
just use open_path_or_dev_mnt() for that now.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
btrfs-progs: rework get_fs_info to remove side effects

get_fs_info() has been silently switching from a device to a mounted
path as needed; the caller's filehandle was unexpectedly closed &
reopened outside the caller's scope.  Not so great.

The callers do want "fdmnt" to be the filehandle for the mount point
in all cases, though - the various ioctls act on this (not on an fd
for the device).  But switching it in the local scope of get_fs_info
is incorrect; it just so happens that *usually* the fd number is
unchanged.

So - use the new helpers to detect when an argument is a block
device, and open the the mounted path more obviously / explicitly
for ioctl use, storing the filehandle in fdmnt.

Then, in get_fs_info, ignore the fd completely, and use the path on
the argument to determine if the caller wanted to act on just that
device, or on all devices for the filesystem.

Affects those commands which are documented to accept either
a block device or a path:

* btrfs device stats
* btrfs replace start
* btrfs scrub start
* btrfs scrub status

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
btrfs-progs: add Makefile rule for static build of btrfs-find-root

btrfs-find-root isn't yet integrated into the main btrfs tool, and is
an important recovery tool, so it deserves to be built as a static
binary.

Signed-off-by: Hugo Mills <hugo@carfax.org.uk>
btrfs-progs: update .gitignore file

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: print errno string when /dev/btrfs-control open fails

Of recently and intermittently I am seeing open fail
for /dev/btrfs-control (btrfs is loaded), and there are no
dmesg errors, this may not be a complete help in digging
this issue but something which is necessary.
Thanks

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: document force option in mkfs usage(); add long opt

I missed updating the mkfs.btrfs usage() when I added the
option to force fs overwrite.

Update that, and while we're at it add a long option, since
all other commands have long counterparts.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
btrfs-progs: mkfs: add missing raid5/6 description

Signed-off-by: Matias Bjørling <m@bjorling.me>
Btrfs-progs: add an option for specifying the root to restore

If the normal fs tree is hosed and the user has multiple subvolumes it's handy
to be able to specify just one of the subvolumes to restore.  It's also handy if
a user only wants to restore say /home instead of his entire disk.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
Btrfs-progs: try other mirrors if decompression fails

This will make the restore program fall back on other mirrors if it fails to
decompress an extent for whatever reason.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
Btrfs-progs: try other mirrors on read failure

If we hit a bad disk and the read doesn't work, try other mirrors in case we
have other disks with good copies.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
btrfs-progs: Fix error handling for failed reads in restore tool when mirrors exist

Signed-off-by: David Marcin <djmarcin@google.com>
restore: Split output directory and btrfs-local path search_dir() parameters

search_dir() recurses down the btrfs tree, and used to take the output
path for every item (i.e. in the running system, output root directory
concatenated with btrfs-local pathname) passed as the only path
parameter. Moving the output root directory to a separate parameter
and passing the btrfs-local pathname for each file and directory
separately allows easy filtering based on the btrfs-local pathname.

Signed-off-by: Peter Stuge <peter@stuge.se>
Signed-off-by: Josef Bacik <josef@redhat.com>
btrfs-progs: add lzo compression support to restore

This patch simply adds support to decompress lzo compressed extents in restore.

Signed-off-by: Josef Bacik <josef@redhat.com>
Btrfs-progs: give restore a list roots option

Since restore has the ability to open really really screwed up file systems, add
a list roots option to it so we can still get the contents of the tree root on a
horribly broken fs.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
btrfs-progs: convert: access name_len and file_type the old way

We can't use ext2_dir_entry_2 typecast on big endian machines directly.
The bytes do not get converted during extX block read due to missing
flag EXT2_DIRBLOCK_V2_STRUCT passed down to ext2fs_read_dir_block4 from
ext2fs_process_dir_block. Fixing on the ext2 side needs updating callers
and (maybe) the library interfaces. We'll fix it on the convert side for
now.

CC: Jan Kara <jack@suse.cz>
Signed-off-by: David Sterba <dsterba@suse.cz>
Btrfs-progs: fix segfault when using tools fs with tree log

We just free the log root after we set it up when we open a ctree in the tools.
This isn't nice, it makes double free's and leaks eb's, makes segfaults with
btrfs-image.  So fix this to be correct, and fix the cleanup if the buffer is
not uptodate.  With this fix I no longer segfault trying to do btrfs-image on a
file system with a log tree.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>