Ok, I got it. Thanks for quick response~ :) 2020년 6월 11일 (목) 오전 10:56, Eric Biggers <[email protected]>님이 작성: > > On Thu, Jun 11, 2020 at 09:23:23AM +0900, Daeho Jeong wrote: > > Yes, I saw the implementation in vfs_write(). > > But if we use mnt_want_write_file() here, it'll call mnt_clone_write() > > internally if the file is already open in write mode. > > Don't you think the below thing is needed? We can increase the counter > > each of them, open and ioctl, like other filesystems such as ext4. > > > > int mnt_clone_write(struct vfsmount *mnt) > > { > > /* superblock may be r/o */ > > if (__mnt_is_readonly(mnt)) > > return -EROFS; > > preempt_disable(); > > mnt_inc_writers(real_mount(mnt)); > > preempt_enable(); > > return 0; > > } > > No, this seems to be left over from when mnt_want_write_file() was paired with > mnt_drop_write() instead of mnt_drop_write_file(). I sent a patch to remove > it: > https://lkml.kernel.org/r/[email protected] > > - Eric
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