Out of curiosity, why does btrfs_update_time() need to call
btrfs_root_readonly()? Why can't it just depend on the
__mnt_want_write() call in touch_atime()?
Surely if there are times when it's not OK to write into a btrfs file
system and mnt_is_readonly() returns false, the VFS is going to get
very confused abyway.
If the btrfs_update_time() is not necessary, then we could drop
btrfs_update_time() and update_time() from the inode operations
entirely, and depend on the VFS-level code in update_time().
- Ted
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