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(parent: 274bd4f) | patch
Btrfs: check if the to-be-added device is writable
authorLi Zefan <lizf@cn.fujitsu.com>
Thu, 8 Dec 2011 01:08:40 +0000 (20:08 -0500)
committerChris Mason <chris.mason@oracle.com>
Thu, 8 Dec 2011 13:55:46 +0000 (08:55 -0500)
commita5d16333612718569ffd26064270e535cb9c3928
tree8c91371ea5f77630ce3683bf4971bd3e6012cd0ctree | snapshot
parent274bd4fb3ed6b72c1d77ef8850511f09fc6b8e4dcommit | diff
Btrfs: check if the to-be-added device is writable

If we call ioctl(BTRFS_IOC_ADD_DEV) directly, we'll succeed in adding
a readonly device to a btrfs filesystem, and btrfs will write to
that device, emitting kernel errors:

[ 3109.833692] lost page write due to I/O error on loop2
[ 3109.833720] lost page write due to I/O error on loop2
...

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
fs/btrfs/volumes.c diff | blob | history
Domain: System / Kernel;