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NFSv4: Refactor NFSv4 error handling 

Prepare for unification of the synchronous and asynchronous error
handling.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2015-09-20 14:32:45 -04:00
parent c6fa8e6de3
commit b3c2aa0745
2 changed files with 36 additions and 9 deletions
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6
fs/nfs/nfs4_fs.h
View File

@ -183,10 +183,12 @@ struct nfs4_state {
struct nfs4_exception {
long timeout;
int retry;
struct nfs4_state *state;
struct inode *inode;
long timeout;
unsigned char delay : 1,
recovering : 1,
retry : 1;
};
struct nfs4_state_recovery_ops {

39
fs/nfs/nfs4proc.c
View File

@ -344,13 +344,16 @@ static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
/* This is the error handling routine for processes that are allowed
* to sleep.
*/
int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
static int nfs4_do_handle_exception(struct nfs_server *server,
int errorcode, struct nfs4_exception *exception)
{
struct nfs_client *clp = server->nfs_client;
struct nfs4_state *state = exception->state;
struct inode *inode = exception->inode;
int ret = errorcode;
exception->delay = 0;
exception->recovering = 0;
exception->retry = 0;
switch(errorcode) {
case 0:
@ -411,9 +414,9 @@ int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_
}
case -NFS4ERR_GRACE:
case -NFS4ERR_DELAY:
ret = nfs4_delay(server->client, &exception->timeout);
if (ret != 0)
break;
exception->delay = 1;
return 0;
case -NFS4ERR_RETRY_UNCACHED_REP:
case -NFS4ERR_OLD_STATEID:
exception->retry = 1;
@ -434,9 +437,31 @@ int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_
/* We failed to handle the error */
return nfs4_map_errors(ret);
wait_on_recovery:
ret = nfs4_wait_clnt_recover(clp);
if (test_bit(NFS_MIG_FAILED, &server->mig_status))
return -EIO;
exception->recovering = 1;
return 0;
}
/* This is the error handling routine for processes that are allowed
* to sleep.
*/
int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
{
struct nfs_client *clp = server->nfs_client;
int ret;
ret = nfs4_do_handle_exception(server, errorcode, exception);
if (exception->delay) {
ret = nfs4_delay(server->client, &exception->timeout);
goto out_retry;
}
if (exception->recovering) {
ret = nfs4_wait_clnt_recover(clp);
if (test_bit(NFS_MIG_FAILED, &server->mig_status))
return -EIO;
goto out_retry;
}
return ret;
out_retry:
if (ret == 0)
exception->retry = 1;
return ret;