From 557134a39c8d2ab79d8b8d53438e03e29feb5ec4 Mon Sep 17 00:00:00 2001 From: Andy Adamson Date: Wed, 1 Apr 2009 09:21:53 -0400 Subject: [PATCH] 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 Signed-off-by: Andy Adamson Signed-off-by: Benny Halevy [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 Signed-off-by: Benny Halevy [Use the presence of a session to determine behaviour instead of the minorversion number.] Signed-off-by: Andy Adamson [constified nfs4_has_session's struct nfs_client parameter] Signed-off-by: Benny Halevy [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 [nfs41: pass rsize and wsize into nfs4_init_session] Signed-off-by: Andy Adamson [separated out removal of rpc_clnt parameter from nfs4_init_session ot a patch of its own] Signed-off-by: Benny Halevy [Pass the nfs_client pointer into nfs4_alloc_session] Signed-off-by: Andy Adamson Signed-off-by: Benny Halevy [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 [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 Signed-off-by: Benny Halevy [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 Signed-off-by: Benny Halevy [moved nfs4_init_slot_table definition to "create_session operation"] Signed-off-by: Benny Halevy [nfs41: alloc session with GFP_KERNEL] Signed-off-by: Benny Halevy Signed-off-by: Trond Myklebust --- fs/nfs/client.c | 60 +++++++++++++++++++++++++++++++++++++++ fs/nfs/internal.h | 12 ++++++++ fs/nfs/nfs4_fs.h | 4 +++ fs/nfs/nfs4proc.c | 34 ++++++++++++++++++++++ include/linux/nfs_fs_sb.h | 49 ++++++++++++++++++++++++++++++++ include/linux/nfs_xdr.h | 15 ++++++++++ 6 files changed, 174 insertions(+) diff --git a/fs/nfs/client.c b/fs/nfs/client.c index a736160046c3..f1506f148521 100644 --- a/fs/nfs/client.c +++ b/fs/nfs/client.c @@ -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) diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index ffa6bd54d439..7cef45db9257 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -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 */ diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h index 84345deab26f..acac6f8c3d39 100644 --- a/fs/nfs/nfs4_fs.h +++ b/fs/nfs/nfs4_fs.h @@ -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]; diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 4674f8092da8..cdd8e74c47d0 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -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, diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h index e9a51fe46aa3..b47c0fc55d42 100644 --- a/include/linux/nfs_fs_sb.h +++ b/include/linux/nfs_fs_sb.h @@ -4,9 +4,12 @@ #include #include #include +#include +#include #include +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 diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index f2c5700c7b6e..8f8c026c558e 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -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 */ }; -- 2.20.1