gistfile1.txt

Crisp ss23 # hdparm -r /dev/sdf2

/dev/sdf2:
 readonly      =  0 (off)
Crisp ss23 # btrfsck /dev/sdf2
found 2394718208 bytes used err is 0
total csum bytes: 1930568
total tree bytes: 417816576
total fs tree bytes: 398311424
btree space waste bytes: 113042195
file data blocks allocated: 1989308416
 referenced 1971613696
Btrfs Btrfs v0.19
Crisp ss23 # mount -w /dev/sdf2 /mnt/new_root/
mount: block device /dev/sdf2 is write-protected but explicit `-w' flag given
Crisp ss23 # mount /dev/sdf2 /mnt/new_root/
mount: block device /dev/sdf2 is write-protected, mounting read-only



Crisp mnt #  mount -t btrfs /dev/sdf2 /mnt/new_root -o remount,rw
mount: /mnt/new_root not mounted already, or bad option
Crisp mnt # umount /mnt/new_root/
umount: /mnt/new_root/: not mounted
Crisp mnt #

device fsid 2a38248e-9ff7-4b3a-aec0-d8d4ced96834 devid 1 transid 1576 /dev/sdf2
device fsid 2a38248e-9ff7-4b3a-aec0-d8d4ced96834 devid 1 transid 1576 /dev/sdf2
Btrfs detected SSD devices, enabling SSD mode
device fsid 2a38248e-9ff7-4b3a-aec0-d8d4ced96834 devid 1 transid 1576 /dev/sdf2
device fsid 2a38248e-9ff7-4b3a-aec0-d8d4ced96834 devid 1 transid 1576 /dev/sdf2
Btrfs detected SSD devices, enabling SSD mode
device fsid 2a38248e-9ff7-4b3a-aec0-d8d4ced96834 devid 1 transid 1576 /dev/sdf2
device fsid 2a38248e-9ff7-4b3a-aec0-d8d4ced96834 devid 1 transid 1576 /dev/sdf2
Btrfs detected SSD devices, enabling SSD mode
device fsid 2a38248e-9ff7-4b3a-aec0-d8d4ced96834 devid 1 transid 1576 /dev/sdf2
device fsid 2a38248e-9ff7-4b3a-aec0-d8d4ced96834 devid 1 transid 1576 /dev/sdf2
Btrfs detected SSD devices, enabling SSD mode
device fsid 2a38248e-9ff7-4b3a-aec0-d8d4ced96834 devid 1 transid 1576 /dev/sdf2
device fsid 2a38248e-9ff7-4b3a-aec0-d8d4ced96834 devid 1 transid 1576 /dev/sdf2
Btrfs detected SSD devices, enabling SSD mode
------------[ cut here ]------------
WARNING: at fs/btrfs/extent-tree.c:5693 btrfs_alloc_free_block+0x1e2/0x420()
Hardware name: H55M-USB3
Pid: 2116, comm: btrfsctl Not tainted 3.0.6-gentoo #5
Call Trace:
[] ? warn_slowpath_common+0x76/0xc0
[] ? btrfs_alloc_free_block+0x1e2/0x420
[] ? read_extent_buffer+0xcf/0x1b0
[] ? __btrfs_cow_block+0x154/0x600
[] ? btrfs_cow_block+0x10b/0x1f0
[] ? commit_cowonly_roots+0x65/0x1d0
[] ? btrfs_commit_transaction+0x406/0x810
[] ? join_transaction.clone.25+0x1c9/0x200
[] ? abort_exclusive_wait+0xb0/0xb0
[] ? btrfs_ioctl+0x5f8/0xe40
[] ? handle_mm_fault+0x113/0x330
[] ? do_page_fault+0x1a9/0x420
[] ? do_vfs_ioctl+0x96/0x540
[] ? sys_ioctl+0x49/0x80
[] ? system_call_fastpath+0x16/0x1b
---[ end trace 28b9d6fcffa207c6 ]---
device fsid 2a38248e-9ff7-4b3a-aec0-d8d4ced96834 devid 1 transid 1576 /dev/sdf2
device fsid 2a38248e-9ff7-4b3a-aec0-d8d4ced96834 devid 1 transid 1576 /dev/sdf2
Btrfs detected SSD devices, enabling SSD mode
device fsid 2a38248e-9ff7-4b3a-aec0-d8d4ced96834 devid 1 transid 1576 /dev/sdf2
device fsid 2a38248e-9ff7-4b3a-aec0-d8d4ced96834 devid 1 transid 1576 /dev/sdf2
device fsid 2a38248e-9ff7-4b3a-aec0-d8d4ced96834 devid 1 transid 1576 /dev/sdf2
device fsid 2a38248e-9ff7-4b3a-aec0-d8d4ced96834 devid 1 transid 1576 /dev/sdf2
Btrfs detected SSD devices, enabling SSD mode
Crisp mnt #

Have you tried turning it off and then on again?

Crisp ss23 # parted /dev/sdf
GNU Parted 3.0
Using /dev/sdf
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) p
Model: ATA OCZ-VERTEX2 (scsi)
Disk /dev/sdf: 60.0GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number Start End Size File system Name Flags
1 1049kB 32.5MB 31.5MB ext2 bios_grub
2 32.5MB 60.0GB 60.0GB

(parted)

Crisp ss23 # parted /dev/sdf
GNU Parted 3.0
Using /dev/sdf
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) p
Model: ATA OCZ-VERTEX2 (scsi)
Disk /dev/sdf: 60.0GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start  End    Size    File system Name      Flags
1       1049kB 32.5MB 31.5MB  ext2        bios_grub
2       32.5MB 60.0GB 60.0GB

Crisp ss23 # mount /dev/sdf1 /mnt/new_media/
Crisp ss23 # umount /dev/sdf1

To demonstrate that its partition specific, not drive specific

Btrfs Btrfs v0.19

Version info