Trond Myklebust | 73e39aa | 2012-11-26 12:49:34 -0500 | [diff] [blame] | 1 | /* |
| 2 | * fs/nfs/nfs4session.h |
| 3 | * |
| 4 | * Copyright (c) 2012 Trond Myklebust <Trond.Myklebust@netapp.com> |
| 5 | * |
| 6 | */ |
| 7 | #ifndef __LINUX_FS_NFS_NFS4SESSION_H |
| 8 | #define __LINUX_FS_NFS_NFS4SESSION_H |
| 9 | |
Trond Myklebust | 76e697b | 2012-11-26 14:20:49 -0500 | [diff] [blame] | 10 | /* maximum number of slots to use */ |
Andy Adamson | bc4b2a8 | 2013-07-22 18:41:23 -0400 | [diff] [blame] | 11 | #define NFS4_DEF_SLOT_TABLE_SIZE (64U) |
Trond Myklebust | 0ca3f48 | 2012-11-21 22:34:45 -0500 | [diff] [blame] | 12 | #define NFS4_MAX_SLOT_TABLE (1024U) |
Trond Myklebust | 76e697b | 2012-11-26 14:20:49 -0500 | [diff] [blame] | 13 | #define NFS4_NO_SLOT ((u32)-1) |
| 14 | |
| 15 | #if IS_ENABLED(CONFIG_NFS_V4) |
| 16 | |
| 17 | /* Sessions slot seqid */ |
| 18 | struct nfs4_slot { |
| 19 | struct nfs4_slot_table *table; |
| 20 | struct nfs4_slot *next; |
| 21 | unsigned long generation; |
Trond Myklebust | 76e697b | 2012-11-26 14:20:49 -0500 | [diff] [blame] | 22 | u32 slot_nr; |
| 23 | u32 seq_nr; |
Trond Myklebust | 07e8dcb | 2016-08-28 10:28:25 -0400 | [diff] [blame^] | 24 | unsigned int interrupted : 1, |
| 25 | seq_done : 1; |
Trond Myklebust | 76e697b | 2012-11-26 14:20:49 -0500 | [diff] [blame] | 26 | }; |
| 27 | |
| 28 | /* Sessions */ |
Andy Adamson | 774d5f1 | 2013-05-20 14:13:50 -0400 | [diff] [blame] | 29 | enum nfs4_slot_tbl_state { |
| 30 | NFS4_SLOT_TBL_DRAINING, |
| 31 | }; |
| 32 | |
Trond Myklebust | 76e697b | 2012-11-26 14:20:49 -0500 | [diff] [blame] | 33 | #define SLOT_TABLE_SZ DIV_ROUND_UP(NFS4_MAX_SLOT_TABLE, 8*sizeof(long)) |
| 34 | struct nfs4_slot_table { |
| 35 | struct nfs4_session *session; /* Parent session */ |
| 36 | struct nfs4_slot *slots; /* seqid per slot */ |
| 37 | unsigned long used_slots[SLOT_TABLE_SZ]; /* used/unused bitmap */ |
| 38 | spinlock_t slot_tbl_lock; |
| 39 | struct rpc_wait_queue slot_tbl_waitq; /* allocators may wait here */ |
Trond Myklebust | 045d2a6 | 2016-08-28 13:25:43 -0400 | [diff] [blame] | 40 | wait_queue_head_t slot_waitq; /* Completion wait on slot */ |
Trond Myklebust | 76e697b | 2012-11-26 14:20:49 -0500 | [diff] [blame] | 41 | u32 max_slots; /* # slots in table */ |
| 42 | u32 max_slotid; /* Max allowed slotid value */ |
| 43 | u32 highest_used_slotid; /* sent to server on each SEQ. |
| 44 | * op for dynamic resizing */ |
| 45 | u32 target_highest_slotid; /* Server max_slot target */ |
| 46 | u32 server_highest_slotid; /* Server highest slotid */ |
Trond Myklebust | 1fa8064 | 2012-12-02 13:54:59 -0500 | [diff] [blame] | 47 | s32 d_target_highest_slotid; /* Derivative */ |
| 48 | s32 d2_target_highest_slotid; /* 2nd derivative */ |
Trond Myklebust | 76e697b | 2012-11-26 14:20:49 -0500 | [diff] [blame] | 49 | unsigned long generation; /* Generation counter for |
| 50 | target_highest_slotid */ |
| 51 | struct completion complete; |
Andy Adamson | 774d5f1 | 2013-05-20 14:13:50 -0400 | [diff] [blame] | 52 | unsigned long slot_tbl_state; |
Trond Myklebust | 76e697b | 2012-11-26 14:20:49 -0500 | [diff] [blame] | 53 | }; |
| 54 | |
| 55 | /* |
| 56 | * Session related parameters |
| 57 | */ |
| 58 | struct nfs4_session { |
| 59 | struct nfs4_sessionid sess_id; |
| 60 | u32 flags; |
| 61 | unsigned long session_state; |
| 62 | u32 hash_alg; |
| 63 | u32 ssv_len; |
| 64 | |
| 65 | /* The fore and back channel */ |
| 66 | struct nfs4_channel_attrs fc_attrs; |
| 67 | struct nfs4_slot_table fc_slot_table; |
| 68 | struct nfs4_channel_attrs bc_attrs; |
| 69 | struct nfs4_slot_table bc_slot_table; |
| 70 | struct nfs_client *clp; |
Trond Myklebust | 76e697b | 2012-11-26 14:20:49 -0500 | [diff] [blame] | 71 | }; |
| 72 | |
| 73 | enum nfs4_session_state { |
| 74 | NFS4_SESSION_INITING, |
Trond Myklebust | e11259f | 2015-03-03 20:35:31 -0500 | [diff] [blame] | 75 | NFS4_SESSION_ESTABLISHED, |
Trond Myklebust | 76e697b | 2012-11-26 14:20:49 -0500 | [diff] [blame] | 76 | }; |
| 77 | |
Chuck Lever | 744aa52 | 2013-08-09 12:48:53 -0400 | [diff] [blame] | 78 | extern int nfs4_setup_slot_table(struct nfs4_slot_table *tbl, |
| 79 | unsigned int max_reqs, const char *queue); |
Trond Myklebust | 20b9a90 | 2014-02-01 13:47:06 -0500 | [diff] [blame] | 80 | extern void nfs4_shutdown_slot_table(struct nfs4_slot_table *tbl); |
Trond Myklebust | 73e39aa | 2012-11-26 12:49:34 -0500 | [diff] [blame] | 81 | extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl); |
Trond Myklebust | 810d82e | 2016-01-23 15:18:18 -0500 | [diff] [blame] | 82 | extern struct nfs4_slot *nfs4_lookup_slot(struct nfs4_slot_table *tbl, u32 slotid); |
Trond Myklebust | 045d2a6 | 2016-08-28 13:25:43 -0400 | [diff] [blame] | 83 | extern int nfs4_slot_wait_on_seqid(struct nfs4_slot_table *tbl, |
| 84 | u32 slotid, u32 seq_nr, |
| 85 | unsigned long timeout); |
Trond Myklebust | 810d82e | 2016-01-23 15:18:18 -0500 | [diff] [blame] | 86 | extern bool nfs4_try_to_lock_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot); |
Trond Myklebust | 73e39aa | 2012-11-26 12:49:34 -0500 | [diff] [blame] | 87 | extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot); |
Chuck Lever | 9d33059 | 2013-08-09 12:48:44 -0400 | [diff] [blame] | 88 | extern void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl); |
Chuck Lever | 9d33059 | 2013-08-09 12:48:44 -0400 | [diff] [blame] | 89 | bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl, |
| 90 | struct nfs4_slot *slot); |
| 91 | void nfs41_wake_slot_table(struct nfs4_slot_table *tbl); |
| 92 | |
| 93 | static inline bool nfs4_slot_tbl_draining(struct nfs4_slot_table *tbl) |
| 94 | { |
| 95 | return !!test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state); |
| 96 | } |
| 97 | |
Trond Myklebust | 810d82e | 2016-01-23 15:18:18 -0500 | [diff] [blame] | 98 | static inline bool nfs4_test_locked_slot(const struct nfs4_slot_table *tbl, |
| 99 | u32 slotid) |
| 100 | { |
| 101 | return !!test_bit(slotid, tbl->used_slots); |
| 102 | } |
| 103 | |
Chuck Lever | 9d33059 | 2013-08-09 12:48:44 -0400 | [diff] [blame] | 104 | #if defined(CONFIG_NFS_V4_1) |
| 105 | extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl, |
| 106 | u32 target_highest_slotid); |
Chuck Lever | 1cec16a | 2013-09-04 12:26:03 -0400 | [diff] [blame] | 107 | extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl, |
| 108 | struct nfs4_slot *slot, |
| 109 | struct nfs4_sequence_res *res); |
Trond Myklebust | 73e39aa | 2012-11-26 12:49:34 -0500 | [diff] [blame] | 110 | |
| 111 | extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses); |
| 112 | |
| 113 | extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp); |
| 114 | extern void nfs4_destroy_session(struct nfs4_session *session); |
Andy Adamson | 18aad3d | 2013-06-26 12:21:49 -0400 | [diff] [blame] | 115 | extern int nfs4_init_session(struct nfs_client *clp); |
Trond Myklebust | 73e39aa | 2012-11-26 12:49:34 -0500 | [diff] [blame] | 116 | extern int nfs4_init_ds_session(struct nfs_client *, unsigned long); |
| 117 | |
Trond Myklebust | 76e697b | 2012-11-26 14:20:49 -0500 | [diff] [blame] | 118 | /* |
| 119 | * Determine if sessions are in use. |
| 120 | */ |
| 121 | static inline int nfs4_has_session(const struct nfs_client *clp) |
| 122 | { |
| 123 | if (clp->cl_session) |
| 124 | return 1; |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | static inline int nfs4_has_persistent_session(const struct nfs_client *clp) |
| 129 | { |
| 130 | if (nfs4_has_session(clp)) |
| 131 | return (clp->cl_session->flags & SESSION4_PERSIST); |
| 132 | return 0; |
| 133 | } |
| 134 | |
Trond Myklebust | 79969dd | 2015-02-18 11:30:18 -0800 | [diff] [blame] | 135 | static inline void nfs4_copy_sessionid(struct nfs4_sessionid *dst, |
| 136 | const struct nfs4_sessionid *src) |
| 137 | { |
| 138 | memcpy(dst->data, src->data, NFS4_MAX_SESSIONID_LEN); |
| 139 | } |
| 140 | |
Trond Myklebust | 2f92ae3 | 2013-08-14 17:58:28 -0400 | [diff] [blame] | 141 | #ifdef CONFIG_CRC32 |
| 142 | /* |
| 143 | * nfs_session_id_hash - calculate the crc32 hash for the session id |
| 144 | * @session - pointer to session |
| 145 | */ |
| 146 | #define nfs_session_id_hash(sess_id) \ |
| 147 | (~crc32_le(0xFFFFFFFF, &(sess_id)->data[0], sizeof((sess_id)->data))) |
| 148 | #else |
| 149 | #define nfs_session_id_hash(session) (0) |
| 150 | #endif |
Trond Myklebust | 73e39aa | 2012-11-26 12:49:34 -0500 | [diff] [blame] | 151 | #else /* defined(CONFIG_NFS_V4_1) */ |
| 152 | |
Andy Adamson | 18aad3d | 2013-06-26 12:21:49 -0400 | [diff] [blame] | 153 | static inline int nfs4_init_session(struct nfs_client *clp) |
Trond Myklebust | 73e39aa | 2012-11-26 12:49:34 -0500 | [diff] [blame] | 154 | { |
| 155 | return 0; |
| 156 | } |
| 157 | |
Trond Myklebust | 76e697b | 2012-11-26 14:20:49 -0500 | [diff] [blame] | 158 | /* |
| 159 | * Determine if sessions are in use. |
| 160 | */ |
| 161 | static inline int nfs4_has_session(const struct nfs_client *clp) |
| 162 | { |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | static inline int nfs4_has_persistent_session(const struct nfs_client *clp) |
| 167 | { |
| 168 | return 0; |
| 169 | } |
| 170 | |
Trond Myklebust | 73e39aa | 2012-11-26 12:49:34 -0500 | [diff] [blame] | 171 | #endif /* defined(CONFIG_NFS_V4_1) */ |
Trond Myklebust | 76e697b | 2012-11-26 14:20:49 -0500 | [diff] [blame] | 172 | #endif /* IS_ENABLED(CONFIG_NFS_V4) */ |
Trond Myklebust | 73e39aa | 2012-11-26 12:49:34 -0500 | [diff] [blame] | 173 | #endif /* __LINUX_FS_NFS_NFS4SESSION_H */ |