K 10
svn:author
V 3
avg
K 8
svn:date
V 27
2014-01-16T12:22:46.173508Z
K 7
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V 911
zfs: getnewvnode_reserve must be called outside of a zfs transaction

Otherwise we could run into the following deadlock.
A thread has a transaction open and assigned to a transaction group.
That would prevent the transaction group from be quiesced and synced.
The thread is blocked in getnewvnode_reserve waiting for a vnode to
a be reclaimed.  vnlru thread is blocked trying to enter ZFS VOP because
a filesystem is suspended by an ongoing rollback or receive operation.
In its turn the operation is waiting for the current transaction group
to be synced.

zfs_zget is always used outside of active transactions, but zfs_mknode
is always used in a transaction context.  Thus, we hoist
getnewvnode_reserve from zfs_mknode to its callers.

While there, assert that ZFS always calls getnewvnode while having
a vnode reserved.

Reported by:	adrian
Tested by:	adrian
MFC after:	17 days
Sponsored by:	HybridCluster

END