btrfs-progs: replace BTRFS_NUM_MIRRORS with BTRFS_MAX_MIRRORS

The chunk-recover.c/BTRFS_NUM_MIRRORS in the userspace means
the same thing as ctree.h/BTRFS_MAX_MIRRORS in the kernelspace,
so to stay consistent with the kernelspace, just make this movement
in the userspace:
	chunk-recover.c/BTRFS_NUM_MIRRORS
		===>
	ctree.h/BTRFS_MAX_MIRRORS

This provides convenience for future use.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: deal with malloc failure in btrfs-image

Handle the malloc failure for dump_worker in the same way as
the restore worker.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: cleanup possible silent failure in btrfs-image

If the malloc above fails, the btrfs-image will exit directly
without any error messages.
Now just return the ENOMEM errno and let the caller prompt the
error message.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: use BTRFS_SUPER_INFO_SIZE to replace raw 4096 in btrfs-image

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: Avoid double-free of fs_devices->list

I found the following patch is insufficient.

===============================================================================
commit 6e6b32ddf58db54f714d0f263c2589f4859e8b5e
Author: Adam Buchbinder <abuchbinder@google.com>
Date:   Fri Jun 13 16:43:56 2014 -0700

    btrfs-progs: Fix a use-after-free in the volumes code.
===============================================================================

"btrfs filesystem show <dev>" with this patch causes segmentation fault
if "<dev>" is a not-mounted Btrfs filesystem.

===============================================================================
Label: none  uuid: <cut here>
        Total devices 1 FS bytes used 112.00KiB
        devid    1 size 59.12GiB used 2.04GiB path /dev/sdd1

Segmentation fault (core dumped)
===============================================================================

It's due to double-free of fs_devices->list as follows.

===============================================================================
cmd_show
  -> list_del(&fs_devices->list)     # 1st one.
  -> btrfs_close_devices(fs_devices)
    -> list_del(&fs_devices->list)   # <- 2nd one introduced at 6e6b32dd.
                                          Double-free happens here.
===============================================================================

First list_del() can safely be removed because fs_devices->list will be
deleted by second one, soon.

Signed-off-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Cc: Adam Buchbinder <abuchbinder@google.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: fix btrfs-image old_restore fsck failure

Steps to reproduce:
	# mkfs.btrfs -f <dev1>
	# btrfs-image <dev1> <image_file>
	# btrfs-image -r -o <image_file> <dev2>
	# btrfs check <dev2>

btrfs check output:
	: read block failed check_tree_block
	: Couldn't read tree root
	: Couldn't open file system

The btrfs-image should not mess with the chunk tree under the old_restore way.

The new restore way was introduced by:
	commit d6f7e3da0dae7b60cb7565f8a47c3b9045c52d1d
	Btrfs-progs: make btrfs-image restore with a valid chunk tree V2
	...
And the following commit enhanced the new restore on the valid chunk tree
building stuff:
	commit ef2a8889ef813ba77061f6a92f4954d047a78932
	Btrfs-progs: make image restore with the original device offsets
	...

But the second commit should not effect the old_restore way since the
old_restore way doesn't try to build a valid chunk tree at all.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: Enhance the command btrfs filesystem df

Enhance the command "btrfs filesystem df" to show space usage information
for a mount point(s). It shows also an estimation of the space available,
on the basis of the current one used.

Signed-off-by: Goffredo Baroncelli <kreijack@inwind.it>
Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: Add helpers functions to handle the printing of data in tabular format

This patch adds some functions to manage the printing of the data in
tabular format.

The function
	struct string_table *table_create(int columns, int rows)
creates an (empty) table.

The functions
	char *table_printf(struct string_table *tab, int column,
		int row, char *fmt, ...)
	char *table_vprintf(struct string_table *tab, int column,
		int row, char *fmt, va_list ap)
populate the table with text. To align the text to the left, the text
shall be prefixed with '<', otherwise the text shall be prefixed by a
'>'. If the first character is a '=', the the text is replace by a
sequence of '=' to fill the column width.

The function
	void table_free(struct string_table *)
frees all the data associated to the table.

The function
	void table_dump(struct string_table *tab)
prints the table on stdout.

Signed-off-by: Goffredo Baroncelli <kreijack@inwind.it>
Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: Add command btrfs filesystem disk-usage

Signed-off-by: Goffredo Baroncelli <kreijack@inwind.it>
Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: Add btrfs device disk-usage command

Signed-off-by: Goffredo Baroncelli <kreijack@inwind.it>
Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: cleanup dead return after usage() for fi-disk_usage

The usage() calls exit() internally, so remove the return after it.

Signed-off-by: Gui Hecheng <guihc.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: Fix memleak in get_raid56_used()

Fix memleak in get_raid56_used().

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Btrfs-progs: fi usage: free memory if realloc fails

Lets not assign *info_ptr to 0 before calling free on it and lose
track of already allocated memory if realloc fails in
add_info_to_list. Lets call free first.

Signed-off-by: Rakesh Pandit <rakesh@tuxera.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: read global reserve size from space infos

Kernels >= 3.15 export the global block reserve as a space info presented
by 'btrfs fi df' but would display 'unknown' instead of some meaningful
string.

Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: add original 'df' and rename 'disk_usage' to 'usage'

Add back the original output of the 'btrfs fi df' command for backward
compatibility. The rich output is moved from 'disk_usage' to 'usage'.

Agreed in http://www.spinics.net/lists/linux-btrfs/msg31698.html

Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: move device usage to cmds-device, more cleanups

Move the command definitions where they belong, keep common 'usage'
functions in cmds-fi-disk_usage.c and add exports.

Rename structures containing 'disk' to 'device'.

Fix whitespace in the modified code.

Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: check if we can't get info from ioctls due to permissions

The TREE_SEARCH ioctl is root-only, FS_INFO will be available for
non-root users with an updated kernel, let the user know.

Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: zero out structures before calling ioctl

Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: print B for bytes

This arguably helps parsers.

Signed-off-by: David Sterba <dsterba@suse.cz>
btrfs-progs: Print more info about device sizes

The entire device size may not be available to the filesystem, eg. if
it's modified via resize. Print this information if it can be obtained
from the DEV_INFO ioctl.

Print the device ID on the same line as the device name and move size to
the next line.

Sample:
/dev/sda7, ID: 3
   Device size:            10.00GiB
   FS occupied:             5.00GiB
   Data,RAID10:           512.00MiB
   Metadata,RAID10:       512.00MiB
   System,RAID10:           4.00MiB
   Unallocated:             9.00GiB

Signed-off-by: David Sterba <dsterba@suse.cz>