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nfs41: sessions client infrastructure 

NFSv4.1 Sessions basic data types, initialization, and destruction.

The session is always associated with a struct nfs_client that holds
the exchange_id results.

Signed-off-by: Rahul Iyer <iyer@netapp.com>
Signed-off-by: Andy Adamson<andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[remove extraneous rpc_clnt pointer, use the struct nfs_client cl_rpcclient.
remove the rpc_clnt parameter from nfs4 nfs4_init_session]
Signed-off-by: Andy Adamson<andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[Use the presence of a session to determine behaviour instead of the
minorversion number.]
Signed-off-by: Andy Adamson <andros@netapp.com>
[constified nfs4_has_session's struct nfs_client parameter]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[Rename nfs4_put_session() to nfs4_destroy_session() and call it from nfs4_free_client() not nfs4_free_server().
Also get rid of nfs4_get_session() and the ref_count in nfs4_session struct as keeping track of nfs_client should be sufficient]
Signed-off-by: Alexandros Batsakis <Alexandros.Batsakis@netapp.com>
[nfs41: pass rsize and wsize into nfs4_init_session]
Signed-off-by: Andy Adamson <andros@netapp.com>
[separated out removal of rpc_clnt parameter from nfs4_init_session ot a
 patch of its own]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[Pass the nfs_client pointer into nfs4_alloc_session]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: don't assign to session->clp->cl_session in nfs4_destroy_session]
[nfs41: fixup nfs4_clear_client_minor_version]
[introduce nfs4_clear_client_minor_version() in this patch]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[Refactor nfs4_init_session]
    Moved session allocation into nfs4_init_client_minor_version, called from
    nfs4_init_client.
    Leave rwise and wsize initialization in nfs4_init_session, called from
    nfs4_init_server.
    Reverted moving of nfs_fsid definition to nfs_fs_sb.h
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: Move NFS4_MAX_SLOT_TABLE define from under CONFIG_NFS_V4_1]
[Fix comile error when CONFIG_NFS_V4_1 is not set.]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[moved nfs4_init_slot_table definition to "create_session operation"]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: alloc session with GFP_KERNEL]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Andy Adamson 2009-04-01 09:21:53 -04:00 committed by Benny Halevy
parent 9ff71c3a98
commit 557134a39c
6 changed files with 174 additions and 0 deletions
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60
fs/nfs/client.c
View File

@ -183,6 +183,20 @@ static void nfs4_shutdown_client(struct nfs_client *clp)
#endif
}
/*
* Clears/puts all minor version specific parts from an nfs_client struct
* reverting it to minorversion 0.
*/
static void nfs4_clear_client_minor_version(struct nfs_client *clp)
{
#ifdef CONFIG_NFS_V4_1
if (nfs4_has_session(clp)) {
nfs4_destroy_session(clp->cl_session);
clp->cl_session = NULL;
}
#endif /* CONFIG_NFS_V4_1 */
}
/*
* Destroy a shared client record
*/
@ -190,6 +204,7 @@ static void nfs_free_client(struct nfs_client *clp)
{
dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
nfs4_clear_client_minor_version(clp);
nfs4_shutdown_client(clp);
nfs_fscache_release_client_cookie(clp);
@ -1053,6 +1068,30 @@ error:
}
#ifdef CONFIG_NFS_V4
/*
* Initialize the minor version specific parts of an NFS4 client record
*/
static int nfs4_init_client_minor_version(struct nfs_client *clp)
{
#if defined(CONFIG_NFS_V4_1)
if (clp->cl_minorversion) {
struct nfs4_session *session = NULL;
/*
* Create the session and mark it expired.
* When a SEQUENCE operation encounters the expired session
* it will do session recovery to initialize it.
*/
session = nfs4_alloc_session(clp);
if (!session)
return -ENOMEM;
clp->cl_session = session;
}
#endif /* CONFIG_NFS_V4_1 */
return 0;
}
/*
* Initialise an NFS4 client record
*/
@ -1087,6 +1126,10 @@ static int nfs4_init_client(struct nfs_client *clp,
}
__set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
error = nfs4_init_client_minor_version(clp);
if (error < 0)
goto error;
nfs_mark_client_ready(clp, NFS_CS_READY);
return 0;
@ -1143,6 +1186,21 @@ error:
return error;
}
/*
* Initialize a session.
* Note: save the mount rsize and wsize for create_server negotiation.
*/
static void nfs4_init_session(struct nfs_client *clp,
unsigned int wsize, unsigned int rsize)
{
#if defined(CONFIG_NFS_V4_1)
if (nfs4_has_session(clp)) {
clp->cl_session->fc_attrs.max_rqst_sz = wsize;
clp->cl_session->fc_attrs.max_resp_sz = rsize;
}
#endif /* CONFIG_NFS_V4_1 */
}
/*
* Create a version 4 volume record
*/
@ -1221,6 +1279,8 @@ struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
BUG_ON(!server->nfs_client->rpc_ops);
BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
nfs4_init_session(server->nfs_client, server->wsize, server->rsize);
/* Probe the root fh to retrieve its FSID */
error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
if (error < 0)

12
fs/nfs/internal.h
View File

@ -206,6 +206,18 @@ extern int nfs4_path_walk(struct nfs_server *server,
const char *path);
#endif
/*
* Determine if sessions are in use.
*/
static inline int nfs4_has_session(const struct nfs_client *clp)
{
#ifdef CONFIG_NFS_V4_1
if (clp->cl_session)
return 1;
#endif /* CONFIG_NFS_V4_1 */
return 0;
}
/*
* Determine the device name as a string
*/

4
fs/nfs/nfs4_fs.h
View File

@ -202,6 +202,10 @@ extern int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
extern struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops;
extern struct nfs4_state_recovery_ops nfs4_nograce_recovery_ops;
#if defined(CONFIG_NFS_V4_1)
extern void nfs4_destroy_session(struct nfs4_session *session);
extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
#endif /* CONFIG_NFS_V4_1 */
extern const u32 nfs4_fattr_bitmap[2];
extern const u32 nfs4_statfs_bitmap[2];

34
fs/nfs/nfs4proc.c
View File

@ -3723,6 +3723,40 @@ int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
return status;
}
#ifdef CONFIG_NFS_V4_1
/* Destroy the slot table */
static void nfs4_destroy_slot_table(struct nfs4_session *session)
{
if (session->fc_slot_table.slots == NULL)
return;
kfree(session->fc_slot_table.slots);
session->fc_slot_table.slots = NULL;
return;
}
struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
{
struct nfs4_session *session;
struct nfs4_slot_table *tbl;
session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
if (!session)
return NULL;
tbl = &session->fc_slot_table;
spin_lock_init(&tbl->slot_tbl_lock);
rpc_init_wait_queue(&tbl->slot_tbl_waitq, "Slot table");
session->clp = clp;
return session;
}
void nfs4_destroy_session(struct nfs4_session *session)
{
nfs4_destroy_slot_table(session);
kfree(session);
}
#endif /* CONFIG_NFS_V4_1 */
struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
.owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
.state_flag_bit = NFS_STATE_RECLAIM_REBOOT,

49
include/linux/nfs_fs_sb.h
View File

@ -4,9 +4,12 @@
#include <linux/list.h>
#include <linux/backing-dev.h>
#include <linux/wait.h>
#include <linux/nfs_xdr.h>
#include <linux/sunrpc/xprt.h>
#include <asm/atomic.h>
struct nfs4_session;
struct nfs_iostats;
struct nlm_host;
@ -66,6 +69,10 @@ struct nfs_client {
unsigned char cl_id_uniquifier;
#endif /* CONFIG_NFS_V4 */
#ifdef CONFIG_NFS_V4_1
struct nfs4_session *cl_session; /* sharred session */
#endif /* CONFIG_NFS_V4_1 */
#ifdef CONFIG_NFS_FSCACHE
struct fscache_cookie *fscache; /* client index cache cookie */
#endif
@ -146,4 +153,46 @@ struct nfs_server {
#define NFS_CAP_ACLS (1U << 3)
#define NFS_CAP_ATOMIC_OPEN (1U << 4)
/* maximum number of slots to use */
#define NFS4_MAX_SLOT_TABLE RPC_MAX_SLOT_TABLE
#if defined(CONFIG_NFS_V4_1)
/* Sessions */
#define SLOT_TABLE_SZ (NFS4_MAX_SLOT_TABLE/(8*sizeof(long)))
struct nfs4_slot_table {
struct nfs4_slot *slots; /* seqid per slot */
unsigned long used_slots[SLOT_TABLE_SZ]; /* used/unused bitmap */
spinlock_t slot_tbl_lock;
struct rpc_wait_queue slot_tbl_waitq; /* allocators may wait here */
int max_slots; /* # slots in table */
int highest_used_slotid; /* sent to server on each SEQ.
* op for dynamic resizing */
};
static inline int slot_idx(struct nfs4_slot_table *tbl, struct nfs4_slot *sp)
{
return sp - tbl->slots;
}
/*
* Session related parameters
*/
struct nfs4_session {
struct nfs4_sessionid sess_id;
u32 flags;
unsigned long session_state;
u32 hash_alg;
u32 ssv_len;
/* The fore and back channel */
struct nfs4_channel_attrs fc_attrs;
struct nfs4_slot_table fc_slot_table;
struct nfs4_channel_attrs bc_attrs;
/* back channel has one slot */
struct nfs_client *clp;
};
#endif /* CONFIG_NFS_V4_1 */
#endif

15
include/linux/nfs_xdr.h
View File

@ -146,6 +146,21 @@ struct nfs4_change_info {
struct nfs_seqid;
/* nfs41 sessions channel attributes */
struct nfs4_channel_attrs {
u32 headerpadsz;
u32 max_rqst_sz;
u32 max_resp_sz;
u32 max_resp_sz_cached;
u32 max_ops;
u32 max_reqs;
};
/* nfs41 sessions slot seqid */
struct nfs4_slot {
u32 seq_nr;
};
struct nfs4_sequence_args {
/* stub */
};