a) rename() plays with i_nlink of old_inode; bad, since it's not
locked. I'd add a variant of btrfs_unlink_inode() that would leave
btrfs_drop_nlink()/btrfs_update_inode() to callers and use it instead.
b) btrfs_link() doesn't check for i_nlink overflows. I don't
know if there's anything preventing that many links to a file on btrfs,
but if there is, it's at least worth a comment in there...
Please, review; patches in followups or in #btrfs in vfs-2.6.git
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