An example is easy to understand so is below.
Output is in Python config reader module format,
just import of this output within a python script is enough.
Useful for
troubleshoot/debug,
storage based on btrfs to render info on their bui/gui and
further btrfs-progs could be very sleek if uses this.
[fsid: 763c600a-7af6-4b8a-a421-6611de307dbf]
seed_fsid: e962e198-ef98-4782-ae99-d0128c9f5c37
fs_devs_addr: ffff880046fb4400
num_devices: 1
open_devices: 1
rw_devices: 1
missing_devices: 0
total_rw_devices: 1633799168
total_devices: 3
opened: 1
seeding: 0
rotating: 1
super_kobj_state: 1
super_kobj_insysfs: 1
device_kobj_state: 1
device_kobj_insysfs: 1
[[uuid: 762f7b41-419e-438a-8a58-8a90f6642c18]]
dev_addr: ffff880046990000
device: /dev/sdg
devid: 3
dev_root_fsid: 763c600a-7af6-4b8a-a421-6611de307dbf
generation: 37
total_bytes: 1633799168
dev_totalbytes: 1633799168
bytes_used: 234881024
type: 0
io_align: 4096
io_width: 4096
sector_size: 4096
mode: 0x83
writeable: 1
in_fs_metadata: 1
missing: 0
can_discard: 0
replace_tgtdev: 0
active_pending: 0
nobarriers: 0
devstats_valid: 1
bdev: not_null
[[seed_fsid: e962e198-ef98-4782-ae99-d0128c9f5c37]]
sprout_fsid: 763c600a-7af6-4b8a-a421-6611de307dbf
seed_fsid: 1c52f894-0ead-43d6-847a-d42359f78370
fs_devs_addr: ffff88004586a400
num_devices: 1
open_devices: 1
rw_devices: 0
missing_devices: 0
total_rw_devices: 0
total_devices: 2
opened: 1
seeding: 1
rotating: 1
super_kobj_state: 1
super_kobj_insysfs: 1
device_kobj_state: 1
device_kobj_insysfs: 1
[[uuid: d064a43c-e9ce-42fb-9c01-140d2bdcd528]]
dev_addr: ffff880046991400
device: /dev/sdf
devid: 2
dev_root_fsid: 763c600a-7af6-4b8a-a421-6611de307dbf
generation: 27
total_bytes: 1633799168
dev_totalbytes: 1633799168
bytes_used: 167772160
type: 0
io_align: 4096
io_width: 4096
sector_size: 4096
mode: 0x81
writeable: 0
in_fs_metadata: 1
missing: 0
can_discard: 0
replace_tgtdev: 0
active_pending: 0
nobarriers: 0
devstats_valid: 0
bdev: not_null
[[seed_fsid: 1c52f894-0ead-43d6-847a-d42359f78370]]
sprout_fsid: e962e198-ef98-4782-ae99-d0128c9f5c37
fs_devs_addr: ffff88004586a000
num_devices: 1
open_devices: 1
rw_devices: 0
missing_devices: 0
total_rw_devices: 0
total_devices: 1
opened: 1
seeding: 1
rotating: 1
super_kobj_state: 1
super_kobj_insysfs: 1
device_kobj_state: 1
device_kobj_insysfs: 1
[[uuid: 4c9b2e81-e4b9-474c-9462-cc2dcd6117d5]]
dev_addr: ffff880046990800
device: /dev/sde
devid: 1
dev_root_fsid: 763c600a-7af6-4b8a-a421-6611de307dbf
generation: 5
total_bytes: 1633796096
dev_totalbytes: 1633796096
bytes_used: 180092928
type: 0
io_align: 4096
io_width: 4096
sector_size: 4096
mode: 0x81
writeable: 0
in_fs_metadata: 1
missing: 0
can_discard: 0
replace_tgtdev: 0
active_pending: 0
nobarriers: 0
devstats_valid: 0
bdev: not_null
V2: Added 3/3 to support for sysfs kobjects that was moved to fs_devices
Anand Jain (3):
Btrfs: procfs-devlist: introduce procfs interface for the device list
Btrfs: procfs-devlist: backport global rcu-string non support
Btsfs: procfs-devlist: update the sysfs contents
fs/btrfs/Makefile | 2 +-
fs/btrfs/ctree.h | 4 ++
fs/btrfs/procfs.c | 153 +++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/btrfs/super.c | 4 ++
fs/btrfs/volumes.h | 1 +
5 files changed, 163 insertions(+), 1 deletion(-)
create mode 100644 fs/btrfs/procfs.c
--
2.0.0.153.g79dcccc
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