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/openbmc/linux/fs/btrfs/ |
H A D | ioctl.c | da24927b Mon Nov 26 02:44:50 CST 2012 Miao Xie <miaox@cn.fujitsu.com> Btrfs: get write access when removing a device
Steps to reproduce: # mkfs.btrfs -d single -m single <disk0> <disk1> # mount -o ro <disk0> <mnt0> # mount -o ro <disk0> <mnt1> # mount -o remount,rw <mnt0> # umount <mnt0> # btrfs device delete <disk1> <mnt1>
We can remove a device from a R/O filesystem. The reason is that we just check the R/O flag of the super block object. It is not enough, because the kernel may set the R/O flag only for the mount point. We need invoke
mnt_want_write_file()
to do a full check.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com> da24927b Mon Nov 26 02:44:50 CST 2012 Miao Xie <miaox@cn.fujitsu.com> Btrfs: get write access when removing a device Steps to reproduce: # mkfs.btrfs -d single -m single <disk0> <disk1> # mount -o ro <disk0> <mnt0> # mount -o ro <disk0> <mnt1> # mount -o remount,rw <mnt0> # umount <mnt0> # btrfs device delete <disk1> <mnt1> We can remove a device from a R/O filesystem. The reason is that we just check the R/O flag of the super block object. It is not enough, because the kernel may set the R/O flag only for the mount point. We need invoke mnt_want_write_file() to do a full check. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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