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NFSv4: nfs_client_return_marked_delegations can't flush data 

Since even filemap_flush() needs to lock pages that are dirty, we
cannot risk calling it from the state manager context. Therefore,
we need to move the call to filemap_flush() to
nfs_async_inode_return_delegation().

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-05-06 19:46:30 -04:00
parent c57d1bc5e0
commit dc327ed4cd
1 changed files with 7 additions and 3 deletions
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10
fs/nfs/delegation.c
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@ -316,6 +316,10 @@ static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegat
* nfs_client_return_marked_delegations - return previously marked delegations
* @clp: nfs_client to process
*
* Note that this function is designed to be called by the state
* manager thread. For this reason, it cannot flush the dirty data,
* since that could deadlock in case of a state recovery error.
*
* Returns zero on success, or a negative errno value.
*/
int nfs_client_return_marked_delegations(struct nfs_client *clp)
@ -340,11 +344,9 @@ int nfs_client_return_marked_delegations(struct nfs_client *clp)
server);
rcu_read_unlock();
if (delegation != NULL) {
filemap_flush(inode->i_mapping);
if (delegation != NULL)
err = __nfs_inode_return_delegation(inode,
delegation, 0);
}
iput(inode);
if (!err)
goto restart;
@ -542,6 +544,8 @@ int nfs_async_inode_return_delegation(struct inode *inode,
struct nfs_client *clp = server->nfs_client;
struct nfs_delegation *delegation;
filemap_flush(inode->i_mapping);
rcu_read_lock();
delegation = rcu_dereference(NFS_I(inode)->delegation);