Hi Chris,
this serie of patches updated the command "btrfs filesystem
df". I update this command because it is not so easy to get
the information about the disk usage from the command "fi df" and "fi show".
This patch was the result of some discussions on the btrfs
mailing list. Many thanks to all the contributors.
from the man page (see 2nd patch):
[...]
The command btrfs filesystem df is used to query the
status of the chunks, how many space on the disk(s) are used by
the chunks, how many space are available in the chunks, and an
estimation of the free space of the filesystem.
[...]
$ ./btrfs filesystem df --help
usage: btrfs filesystem disk-usage [-k] <path> [<path>..]
Show space usage information for a mount point(s).
-k Set KB (1024 bytes) as unit
$ ./btrfs filesystem df /
Path: /
Summary:
Disk_size: 72.57GB
Disk_allocated: 25.10GB
Disk_unallocated: 47.48GB
Logical_size: 23.06GB
Used: 11.01GB
Free_(Estimated): 55.66GB (Max: 59.52GB, Min: 35.78GB)
Data_to_disk_ratio: 92 %
Allocated_area:
Type Mode Size_(disk) Size_(logical) Used
Data Single 21.01GB 21.01GB 12.77GB
System DUP 80.00MB 40.00MB 4.00KB
System Single 4.00MB 4.00MB 0.00
Metadata DUP 4.00GB 2.00GB 709.63MB
Metadata Single 8.00MB 8.00MB 0.00
Where:
Disk_size -> sum of sizes of teh disks
Disk_allocated -> sum of chunk sizes
Disk_unallocated -> Disk_size - Disk_allocated
Logical_size -> sum of logical area sizes
Used -> logical area used
Free_(Estimated) -> on the basis of allocated
chunk, an estrapolation of
the free space
Data_to_disk_ratio -> ration between the space occuped
by a chunk and the real space
available ( due to duplication
and/or RAID level)
Type -> kind of chunk
Mode -> allocation policy of a chunk
Size_(disk) -> area of disk(s) occuped by the
chunk (see it as raw space used)
Size_(logical) -> logical area size of the chunk
Used -> portion of the logical area
used by the filesystem
You can pull this change from
http://cassiopea.homelinux.net/git/btrfs-progs-unstable.git
branch
disk_free
Please pull.
Signed-off-by: Goffredo Baroncelli <kreijack@xxxxxxxxx>
BR
Goffredo Baroncelli
Changelog:
V4->V5 Add a close(fd) to avoid file descriptor leaking
V3->V4 Removed the switch -d -s from getopt(), aligned the
column Size_(logical), renamed the fields:
- Details -> Allocated_area
- Chunk_type -> Type
V2->V3 Removed the options '-s' and '-d'; replaced Chunk-size
and Logical-size with Size_(disk) and Size_(logical).
Update the man page.
V1->V2 Uses getopt(); replace "-" with "_"; change the behaviour
of the switches '-s' and '-d'.
V0->V1 Change the name of command from disk-usage to df
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