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8735d319a3
We lock multiple inodes by order of their inode number. This fixes the directory entry paths that hold parent dir and target inode locks. Link and unlink are easy because they just acquire the existing parent dir and target inode locks. Lookup is a little squirrely because we don't want to try and order the parent dir lock with locks down in iget. It turns out that it's safe to drop the dir lock before calling iget as long as iget handles racing the inode cache instantiation with inode deletion. Creation is the remaining pattern and it's a little weird because we want to lock the newly created inode before we create it and the items that store it. We add a function that correctly orders the locks, transaction, and inode cache instantiation. Signed-off-by: Zach Brown <zab@versity.com>