Btrfs: get write access when doing resize fs

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Steps to reproduce:
 # mkfs.btrfs <partition>
 # mount -o ro <partition> <mnt0>
 # mount -o ro <partition> <mnt1>
 # mount -o remount,rw <mnt0>
 # umount <mnt0>
 # btrfs fi resize 10g <mnt1>

We re-sized 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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This commit is contained in:

Miao Xie 2012-11-26 08:43:45 +00:00 • committed by Chris Mason

parent 3c04ce0105

commit 198605a8e2

1 changed files with 8 additions and 2 deletions

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10

fs/btrfs/ioctl.c

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