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author | Andy Adamson <andros@netapp.com> | 2011-01-06 02:04:32 +0000 |
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committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2011-01-06 14:46:24 -0500 |
commit | c36fca52f5e4594ffd0ff175b328966b0d393184 (patch) | |
tree | 6d771744cc49f0edc0d2b6b2f9fe919163002346 /fs/nfs/callback.h | |
parent | 2c2618c6f29c41a0a966f14f05c8bf45fcabb750 (diff) | |
download | linux-c36fca52f5e4594ffd0ff175b328966b0d393184.tar.gz linux-c36fca52f5e4594ffd0ff175b328966b0d393184.tar.bz2 linux-c36fca52f5e4594ffd0ff175b328966b0d393184.zip |
NFS refactor nfs_find_client and reference client across callback processing
Fixes a bug where the nfs_client could be freed during callback processing.
Refactor nfs_find_client to use minorversion specific means to locate the
correct nfs_client structure.
In the NFS layer, V4.0 clients are found using the callback_ident field in the
CB_COMPOUND header. V4.1 clients are found using the sessionID in the
CB_SEQUENCE operation which is also compared against the sessionID associated
with the back channel thread after a successful CREATE_SESSION.
Each of these methods finds the one an only nfs_client associated
with the incoming callback request - so nfs_find_client_next is not needed.
In the RPC layer, the pg_authenticate call needs to find the nfs_client. For
the v4.0 callback service, the callback identifier has not been decoded so a
search by address, version, and minorversion is used. The sessionid for the
sessions based callback service has (usually) not been set for the
pg_authenticate on a CB_NULL call which can be sent prior to the return
of a CREATE_SESSION call, so the sessionid associated with the back channel
thread is not used to find the client in pg_authenticate for CB_NULL calls.
Pass the referenced nfs_client to each CB_COMPOUND operation being proceesed
via the new cb_process_state structure. The reference is held across
cb_compound processing.
Use the new cb_process_state struct to move the NFS4ERR_RETRY_UNCACHED_REP
processing from process_op into nfs4_callback_sequence where it belongs.
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/callback.h')
-rw-r--r-- | fs/nfs/callback.h | 28 |
1 files changed, 21 insertions, 7 deletions
diff --git a/fs/nfs/callback.h b/fs/nfs/callback.h index 58d61a8ce8b9..25e8802a51d1 100644 --- a/fs/nfs/callback.h +++ b/fs/nfs/callback.h @@ -34,10 +34,17 @@ enum nfs4_callback_opnum { OP_CB_ILLEGAL = 10044, }; +struct cb_process_state { + __be32 drc_status; + struct nfs_client *clp; + struct nfs4_sessionid *svc_sid; /* v4.1 callback service sessionid */ +}; + struct cb_compound_hdr_arg { unsigned int taglen; const char *tag; unsigned int minorversion; + unsigned int cb_ident; /* v4.0 callback identifier */ unsigned nops; }; @@ -103,8 +110,9 @@ struct cb_sequenceres { uint32_t csr_target_highestslotid; }; -extern unsigned nfs4_callback_sequence(struct cb_sequenceargs *args, - struct cb_sequenceres *res); +extern __be32 nfs4_callback_sequence(struct cb_sequenceargs *args, + struct cb_sequenceres *res, + struct cb_process_state *cps); extern int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid); @@ -118,19 +126,25 @@ struct cb_recallanyargs { uint32_t craa_type_mask; }; -extern unsigned nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy); +extern __be32 nfs4_callback_recallany(struct cb_recallanyargs *args, + void *dummy, + struct cb_process_state *cps); struct cb_recallslotargs { struct sockaddr *crsa_addr; uint32_t crsa_target_max_slots; }; -extern unsigned nfs4_callback_recallslot(struct cb_recallslotargs *args, - void *dummy); +extern __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, + void *dummy, + struct cb_process_state *cps); #endif /* CONFIG_NFS_V4_1 */ -extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res); -extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy); +extern __be32 nfs4_callback_getattr(struct cb_getattrargs *args, + struct cb_getattrres *res, + struct cb_process_state *cps); +extern __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy, + struct cb_process_state *cps); #ifdef CONFIG_NFS_V4 extern int nfs_callback_up(u32 minorversion, struct rpc_xprt *xprt); |