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authorChristoph Hellwig <hch@lst.de>2014-05-05 13:11:59 +0200
committerChristoph Hellwig <hch@lst.de>2015-02-02 18:09:42 +0100
commit9cf514ccfacb301f3b1b4509a8ce25dffad55880 (patch)
tree2d78e2ad865bfc77c910b100c1fadab8f5004def /fs/nfsd/state.h
parent4d227fca1b32f95f1246894ebef879efccb2ec15 (diff)
nfsd: implement pNFS operations
Add support for the GETDEVICEINFO, LAYOUTGET, LAYOUTCOMMIT and LAYOUTRETURN NFSv4.1 operations, as well as backing code to manage outstanding layouts and devices. Layout management is very straight forward, with a nfs4_layout_stateid structure that extends nfs4_stid to manage layout stateids as the top-level structure. It is linked into the nfs4_file and nfs4_client structures like the other stateids, and contains a linked list of layouts that hang of the stateid. The actual layout operations are implemented in layout drivers that are not part of this commit, but will be added later. The worst part of this commit is the management of the pNFS device IDs, which suffers from a specification that is not sanely implementable due to the fact that the device-IDs are global and not bound to an export, and have a small enough size so that we can't store the fsid portion of a file handle, and must never be reused. As we still do need perform all export authentication and validation checks on a device ID passed to GETDEVICEINFO we are caught between a rock and a hard place. To work around this issue we add a new hash that maps from a 64-bit integer to a fsid so that we can look up the export to authenticate against it, a 32-bit integer as a generation that we can bump when changing the device, and a currently unused 32-bit integer that could be used in the future to handle more than a single device per export. Entries in this hash table are never deleted as we can't reuse the ids anyway, and would have a severe lifetime problem anyway as Linux export structures are temporary structures that can go away under load. Parts of the XDR data, structures and marshaling/unmarshaling code, as well as many concepts are derived from the old pNFS server implementation from Andy Adamson, Benny Halevy, Dean Hildebrand, Marc Eshel, Fred Isaman, Mike Sager, Ricardo Labiaga and many others. Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/nfsd/state.h')
-rw-r--r--fs/nfsd/state.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 38ebb1268b59..5f66b7fd0297 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -92,6 +92,7 @@ struct nfs4_stid {
/* For a deleg stateid kept around only to process free_stateid's: */
#define NFS4_REVOKED_DELEG_STID 16
#define NFS4_CLOSED_DELEG_STID 32
+#define NFS4_LAYOUT_STID 64
unsigned char sc_type;
stateid_t sc_stateid;
struct nfs4_client *sc_client;
@@ -297,6 +298,9 @@ struct nfs4_client {
struct list_head cl_delegations;
struct list_head cl_revoked; /* unacknowledged, revoked 4.1 state */
struct list_head cl_lru; /* tail queue */
+#ifdef CONFIG_NFSD_PNFS
+ struct list_head cl_lo_states; /* outstanding layout states */
+#endif
struct xdr_netobj cl_name; /* id generated by client */
nfs4_verifier cl_verifier; /* generated by client */
time_t cl_time; /* time of last lease renewal */
@@ -496,6 +500,9 @@ struct nfs4_file {
int fi_delegees;
struct knfsd_fh fi_fhandle;
bool fi_had_conflict;
+#ifdef CONFIG_NFSD_PNFS
+ struct list_head fi_lo_states;
+#endif
};
/*
@@ -528,6 +535,20 @@ static inline struct nfs4_ol_stateid *openlockstateid(struct nfs4_stid *s)
return container_of(s, struct nfs4_ol_stateid, st_stid);
}
+struct nfs4_layout_stateid {
+ struct nfs4_stid ls_stid;
+ struct list_head ls_perclnt;
+ struct list_head ls_perfile;
+ spinlock_t ls_lock;
+ struct list_head ls_layouts;
+ u32 ls_layout_type;
+};
+
+static inline struct nfs4_layout_stateid *layoutstateid(struct nfs4_stid *s)
+{
+ return container_of(s, struct nfs4_layout_stateid, ls_stid);
+}
+
/* flags for preprocess_seqid_op() */
#define RD_STATE 0x00000010
#define WR_STATE 0x00000020