From 73e39aaa8366694450cd6034050f542f965e277d Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 26 Nov 2012 12:49:34 -0500 Subject: [PATCH] NFSv4.1: Cleanup move session slot management to fs/nfs/nfs4session.c NFSv4.1 session management is getting complex enough to deserve a separate file. Signed-off-by: Trond Myklebust --- fs/nfs/Makefile | 2 +- fs/nfs/callback_proc.c | 1 + fs/nfs/internal.h | 2 - fs/nfs/nfs4_fs.h | 11 - fs/nfs/nfs4client.c | 1 + fs/nfs/nfs4filelayoutdev.c | 1 + fs/nfs/nfs4proc.c | 415 +---------------------------------- fs/nfs/nfs4session.c | 436 +++++++++++++++++++++++++++++++++++++ fs/nfs/nfs4session.h | 35 +++ 9 files changed, 477 insertions(+), 427 deletions(-) create mode 100644 fs/nfs/nfs4session.c create mode 100644 fs/nfs/nfs4session.h diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile index b7db60897f91..cce2c057bd2d 100644 --- a/fs/nfs/Makefile +++ b/fs/nfs/Makefile @@ -24,7 +24,7 @@ nfsv4-y := nfs4proc.o nfs4xdr.o nfs4state.o nfs4renewd.o nfs4super.o nfs4file.o delegation.o idmap.o callback.o callback_xdr.o callback_proc.o \ nfs4namespace.o nfs4getroot.o nfs4client.o nfsv4-$(CONFIG_SYSCTL) += nfs4sysctl.o -nfsv4-$(CONFIG_NFS_V4_1) += pnfs.o pnfs_dev.o +nfsv4-$(CONFIG_NFS_V4_1) += nfs4session.o pnfs.o pnfs_dev.o obj-$(CONFIG_PNFS_FILE_LAYOUT) += nfs_layout_nfsv41_files.o nfs_layout_nfsv41_files-y := nfs4filelayout.o nfs4filelayoutdev.o diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c index f99faad78c72..c89b26bc9759 100644 --- a/fs/nfs/callback_proc.c +++ b/fs/nfs/callback_proc.c @@ -14,6 +14,7 @@ #include "delegation.h" #include "internal.h" #include "pnfs.h" +#include "nfs4session.h" #ifdef NFS_DEBUG #define NFSDBG_FACILITY NFSDBG_CALLBACK diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index 05521cadac2e..8965a998b306 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -276,8 +276,6 @@ extern const u32 nfs41_maxwrite_overhead; extern struct rpc_procinfo nfs4_procedures[]; #endif -extern int nfs4_init_ds_session(struct nfs_client *, unsigned long); - /* proc.c */ void nfs_close_context(struct nfs_open_context *ctx, int is_sync); extern struct nfs_client *nfs_init_client(struct nfs_client *clp, diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h index 2f6a9f9d9299..cd3e3096b60a 100644 --- a/fs/nfs/nfs4_fs.h +++ b/fs/nfs/nfs4_fs.h @@ -249,19 +249,13 @@ extern int nfs4_setup_sequence(const struct nfs_server *server, extern int nfs41_setup_sequence(struct nfs4_session *session, struct nfs4_sequence_args *args, struct nfs4_sequence_res *res, struct rpc_task *task); -extern void nfs4_destroy_session(struct nfs4_session *session); -extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp); extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *); extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *); -extern int nfs4_init_session(struct nfs_server *server); extern int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo); extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync); -extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl, - u32 target_highest_slotid); - static inline bool is_ds_only_client(struct nfs_client *clp) { @@ -287,11 +281,6 @@ static inline int nfs4_setup_sequence(const struct nfs_server *server, return 0; } -static inline int nfs4_init_session(struct nfs_server *server) -{ - return 0; -} - static inline bool is_ds_only_client(struct nfs_client *clp) { diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c index 72717e67b34e..acc347268124 100644 --- a/fs/nfs/nfs4client.c +++ b/fs/nfs/nfs4client.c @@ -12,6 +12,7 @@ #include "internal.h" #include "callback.h" #include "delegation.h" +#include "nfs4session.h" #include "pnfs.h" #include "netns.h" diff --git a/fs/nfs/nfs4filelayoutdev.c b/fs/nfs/nfs4filelayoutdev.c index 93e2530d7098..b720064bcd7f 100644 --- a/fs/nfs/nfs4filelayoutdev.c +++ b/fs/nfs/nfs4filelayoutdev.c @@ -33,6 +33,7 @@ #include #include "internal.h" +#include "nfs4session.h" #include "nfs4filelayout.h" #define NFSDBG_FACILITY NFSDBG_PNFS_LD diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index d75e2a2576eb..a0c35ab12a6b 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -52,7 +52,6 @@ #include #include #include -#include #include #include #include @@ -64,6 +63,8 @@ #include "callback.h" #include "pnfs.h" #include "netns.h" +#include "nfs4session.h" + #define NFSDBG_FACILITY NFSDBG_PROC @@ -378,64 +379,6 @@ static void renew_lease(const struct nfs_server *server, unsigned long timestamp #if defined(CONFIG_NFS_V4_1) -/* - * nfs4_shrink_slot_table - free retired slots from the slot table - */ -static void nfs4_shrink_slot_table(struct nfs4_slot_table *tbl, u32 newsize) -{ - struct nfs4_slot **p; - if (newsize >= tbl->max_slots) - return; - - p = &tbl->slots; - while (newsize--) - p = &(*p)->next; - while (*p) { - struct nfs4_slot *slot = *p; - - *p = slot->next; - kfree(slot); - tbl->max_slots--; - } -} - -/* - * nfs4_free_slot - free a slot and efficiently update slot table. - * - * freeing a slot is trivially done by clearing its respective bit - * in the bitmap. - * If the freed slotid equals highest_used_slotid we want to update it - * so that the server would be able to size down the slot table if needed, - * otherwise we know that the highest_used_slotid is still in use. - * When updating highest_used_slotid there may be "holes" in the bitmap - * so we need to scan down from highest_used_slotid to 0 looking for the now - * highest slotid in use. - * If none found, highest_used_slotid is set to NFS4_NO_SLOT. - * - * Must be called while holding tbl->slot_tbl_lock - */ -static void -nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot) -{ - u32 slotid = slot->slot_nr; - - /* clear used bit in bitmap */ - __clear_bit(slotid, tbl->used_slots); - - /* update highest_used_slotid when it is freed */ - if (slotid == tbl->highest_used_slotid) { - u32 new_max = find_last_bit(tbl->used_slots, slotid); - if (new_max < slotid) - tbl->highest_used_slotid = new_max; - else { - tbl->highest_used_slotid = NFS4_NO_SLOT; - nfs4_session_drain_complete(tbl->session, tbl); - } - } - dprintk("%s: slotid %u highest_used_slotid %d\n", __func__, - slotid, tbl->highest_used_slotid); -} - bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy) { rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED); @@ -465,56 +408,6 @@ static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) res->sr_slot = NULL; } -/* Update the client's idea of target_highest_slotid */ -static void nfs41_set_target_slotid_locked(struct nfs4_slot_table *tbl, - u32 target_highest_slotid) -{ - unsigned int max_slotid, i; - - if (tbl->target_highest_slotid == target_highest_slotid) - return; - tbl->target_highest_slotid = target_highest_slotid; - tbl->generation++; - - max_slotid = min(NFS4_MAX_SLOT_TABLE - 1, tbl->target_highest_slotid); - for (i = tbl->max_slotid + 1; i <= max_slotid; i++) - rpc_wake_up_next(&tbl->slot_tbl_waitq); - tbl->max_slotid = max_slotid; -} - -void nfs41_set_target_slotid(struct nfs4_slot_table *tbl, - u32 target_highest_slotid) -{ - spin_lock(&tbl->slot_tbl_lock); - nfs41_set_target_slotid_locked(tbl, target_highest_slotid); - spin_unlock(&tbl->slot_tbl_lock); -} - -static void nfs41_set_server_slotid_locked(struct nfs4_slot_table *tbl, - u32 highest_slotid) -{ - if (tbl->server_highest_slotid == highest_slotid) - return; - if (tbl->highest_used_slotid > highest_slotid) - return; - /* Deallocate slots */ - nfs4_shrink_slot_table(tbl, highest_slotid + 1); - tbl->server_highest_slotid = highest_slotid; -} - -static void nfs41_update_target_slotid(struct nfs4_slot_table *tbl, - struct nfs4_slot *slot, - struct nfs4_sequence_res *res) -{ - spin_lock(&tbl->slot_tbl_lock); - if (tbl->generation != slot->generation) - goto out; - nfs41_set_server_slotid_locked(tbl, res->sr_highest_slotid); - nfs41_set_target_slotid_locked(tbl, res->sr_target_highest_slotid); -out: - spin_unlock(&tbl->slot_tbl_lock); -} - static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) { struct nfs4_session *session; @@ -585,79 +478,6 @@ static int nfs4_sequence_done(struct rpc_task *task, return nfs41_sequence_done(task, res); } -static struct nfs4_slot *nfs4_new_slot(struct nfs4_slot_table *tbl, - u32 slotid, u32 seq_init, gfp_t gfp_mask) -{ - struct nfs4_slot *slot; - - slot = kzalloc(sizeof(*slot), gfp_mask); - if (slot) { - slot->table = tbl; - slot->slot_nr = slotid; - slot->seq_nr = seq_init; - } - return slot; -} - -static struct nfs4_slot *nfs4_find_or_create_slot(struct nfs4_slot_table *tbl, - u32 slotid, u32 seq_init, gfp_t gfp_mask) -{ - struct nfs4_slot **p, *slot; - - p = &tbl->slots; - for (;;) { - if (*p == NULL) { - *p = nfs4_new_slot(tbl, tbl->max_slots, - seq_init, gfp_mask); - if (*p == NULL) - break; - tbl->max_slots++; - } - slot = *p; - if (slot->slot_nr == slotid) - return slot; - p = &slot->next; - } - return ERR_PTR(-ENOMEM); -} - -/* - * nfs4_alloc_slot - efficiently look for a free slot - * - * nfs4_alloc_slot looks for an unset bit in the used_slots bitmap. - * If found, we mark the slot as used, update the highest_used_slotid, - * and respectively set up the sequence operation args. - * - * Note: must be called with under the slot_tbl_lock. - */ -static struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl) -{ - struct nfs4_slot *ret = ERR_PTR(-EBUSY); - u32 slotid; - - dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n", - __func__, tbl->used_slots[0], tbl->highest_used_slotid, - tbl->max_slotid + 1); - slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slotid + 1); - if (slotid > tbl->max_slotid) - goto out; - ret = nfs4_find_or_create_slot(tbl, slotid, 1, GFP_NOWAIT); - if (IS_ERR(ret)) - goto out; - __set_bit(slotid, tbl->used_slots); - if (slotid > tbl->highest_used_slotid || - tbl->highest_used_slotid == NFS4_NO_SLOT) - tbl->highest_used_slotid = slotid; - ret->renewal_time = jiffies; - ret->generation = tbl->generation; - -out: - dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n", - __func__, tbl->used_slots[0], tbl->highest_used_slotid, - !IS_ERR(ret) ? ret->slot_nr : -1); - return ret; -} - static void nfs41_init_sequence(struct nfs4_sequence_args *args, struct nfs4_sequence_res *res, int cache_reply) { @@ -5716,143 +5536,6 @@ int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) return status; } -static int nfs4_grow_slot_table(struct nfs4_slot_table *tbl, - u32 max_reqs, u32 ivalue) -{ - if (max_reqs <= tbl->max_slots) - return 0; - if (!IS_ERR(nfs4_find_or_create_slot(tbl, max_reqs - 1, ivalue, GFP_NOFS))) - return 0; - return -ENOMEM; -} - -static void nfs4_reset_slot_table(struct nfs4_slot_table *tbl, - u32 server_highest_slotid, - u32 ivalue) -{ - struct nfs4_slot **p; - - nfs4_shrink_slot_table(tbl, server_highest_slotid + 1); - p = &tbl->slots; - while (*p) { - (*p)->seq_nr = ivalue; - p = &(*p)->next; - } - tbl->highest_used_slotid = NFS4_NO_SLOT; - tbl->target_highest_slotid = server_highest_slotid; - tbl->server_highest_slotid = server_highest_slotid; - tbl->max_slotid = server_highest_slotid; -} - -/* - * (re)Initialise a slot table - */ -static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, - u32 max_reqs, u32 ivalue) -{ - int ret; - - dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__, - max_reqs, tbl->max_slots); - - if (max_reqs > NFS4_MAX_SLOT_TABLE) - max_reqs = NFS4_MAX_SLOT_TABLE; - - ret = nfs4_grow_slot_table(tbl, max_reqs, ivalue); - if (ret) - goto out; - - spin_lock(&tbl->slot_tbl_lock); - nfs4_reset_slot_table(tbl, max_reqs - 1, ivalue); - spin_unlock(&tbl->slot_tbl_lock); - - dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__, - tbl, tbl->slots, tbl->max_slots); -out: - dprintk("<-- %s: return %d\n", __func__, ret); - return ret; -} - -/* Destroy the slot table */ -static void nfs4_destroy_slot_tables(struct nfs4_session *session) -{ - nfs4_shrink_slot_table(&session->fc_slot_table, 0); - nfs4_shrink_slot_table(&session->bc_slot_table, 0); -} - -/* - * Initialize or reset the forechannel and backchannel tables - */ -static int nfs4_setup_session_slot_tables(struct nfs4_session *ses) -{ - struct nfs4_slot_table *tbl; - int status; - - dprintk("--> %s\n", __func__); - /* Fore channel */ - tbl = &ses->fc_slot_table; - tbl->session = ses; - status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1); - if (status) /* -ENOMEM */ - return status; - /* Back channel */ - tbl = &ses->bc_slot_table; - tbl->session = ses; - status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0); - if (status && tbl->slots == NULL) - /* Fore and back channel share a connection so get - * both slot tables or neither */ - nfs4_destroy_slot_tables(ses); - return status; -} - -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_NOFS); - if (!session) - return NULL; - - tbl = &session->fc_slot_table; - tbl->highest_used_slotid = NFS4_NO_SLOT; - spin_lock_init(&tbl->slot_tbl_lock); - rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table"); - init_completion(&tbl->complete); - - tbl = &session->bc_slot_table; - tbl->highest_used_slotid = NFS4_NO_SLOT; - spin_lock_init(&tbl->slot_tbl_lock); - rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table"); - init_completion(&tbl->complete); - - session->session_state = 1<clp = clp; - return session; -} - -void nfs4_destroy_session(struct nfs4_session *session) -{ - struct rpc_xprt *xprt; - struct rpc_cred *cred; - - cred = nfs4_get_exchange_id_cred(session->clp); - nfs4_proc_destroy_session(session, cred); - if (cred) - put_rpccred(cred); - - rcu_read_lock(); - xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt); - rcu_read_unlock(); - dprintk("%s Destroy backchannel for xprt %p\n", - __func__, xprt); - xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS); - nfs4_destroy_slot_tables(session); - kfree(session); -} - /* * Initialize the values to be used by the client in CREATE_SESSION * If nfs4_init_session set the fore channel request and response sizes, @@ -6046,100 +5729,6 @@ int nfs4_proc_destroy_session(struct nfs4_session *session, return status; } -/* - * With sessions, the client is not marked ready until after a - * successful EXCHANGE_ID and CREATE_SESSION. - * - * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate - * other versions of NFS can be tried. - */ -static int nfs41_check_session_ready(struct nfs_client *clp) -{ - int ret; - - if (clp->cl_cons_state == NFS_CS_SESSION_INITING) { - ret = nfs4_client_recover_expired_lease(clp); - if (ret) - return ret; - } - if (clp->cl_cons_state < NFS_CS_READY) - return -EPROTONOSUPPORT; - smp_rmb(); - return 0; -} - -int nfs4_init_session(struct nfs_server *server) -{ - struct nfs_client *clp = server->nfs_client; - struct nfs4_session *session; - unsigned int target_max_rqst_sz = NFS_MAX_FILE_IO_SIZE; - unsigned int target_max_resp_sz = NFS_MAX_FILE_IO_SIZE; - - if (!nfs4_has_session(clp)) - return 0; - - if (server->rsize != 0) - target_max_resp_sz = server->rsize; - target_max_resp_sz += nfs41_maxread_overhead; - - if (server->wsize != 0) - target_max_rqst_sz = server->wsize; - target_max_rqst_sz += nfs41_maxwrite_overhead; - - session = clp->cl_session; - spin_lock(&clp->cl_lock); - if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) { - /* Initialise targets and channel attributes */ - session->fc_target_max_rqst_sz = target_max_rqst_sz; - session->fc_attrs.max_rqst_sz = target_max_rqst_sz; - session->fc_target_max_resp_sz = target_max_resp_sz; - session->fc_attrs.max_resp_sz = target_max_resp_sz; - } else { - /* Just adjust the targets */ - if (target_max_rqst_sz > session->fc_target_max_rqst_sz) { - session->fc_target_max_rqst_sz = target_max_rqst_sz; - set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); - } - if (target_max_resp_sz > session->fc_target_max_resp_sz) { - session->fc_target_max_resp_sz = target_max_resp_sz; - set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); - } - } - spin_unlock(&clp->cl_lock); - - if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) - nfs4_schedule_lease_recovery(clp); - - return nfs41_check_session_ready(clp); -} - -int nfs4_init_ds_session(struct nfs_client *clp, unsigned long lease_time) -{ - struct nfs4_session *session = clp->cl_session; - int ret; - - spin_lock(&clp->cl_lock); - if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) { - /* - * Do not set NFS_CS_CHECK_LEASE_TIME instead set the - * DS lease to be equal to the MDS lease. - */ - clp->cl_lease_time = lease_time; - clp->cl_last_renewal = jiffies; - } - spin_unlock(&clp->cl_lock); - - ret = nfs41_check_session_ready(clp); - if (ret) - return ret; - /* Test for the DS role */ - if (!is_ds_client(clp)) - return -ENODEV; - return 0; -} -EXPORT_SYMBOL_GPL(nfs4_init_ds_session); - - /* * Renew the cl_session lease. */ diff --git a/fs/nfs/nfs4session.c b/fs/nfs/nfs4session.c new file mode 100644 index 000000000000..701170293ceb --- /dev/null +++ b/fs/nfs/nfs4session.c @@ -0,0 +1,436 @@ +/* + * fs/nfs/nfs4session.c + * + * Copyright (c) 2012 Trond Myklebust + * + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "nfs4_fs.h" +#include "internal.h" +#include "nfs4session.h" +#include "callback.h" + +#define NFSDBG_FACILITY NFSDBG_STATE + +/* + * nfs4_shrink_slot_table - free retired slots from the slot table + */ +static void nfs4_shrink_slot_table(struct nfs4_slot_table *tbl, u32 newsize) +{ + struct nfs4_slot **p; + if (newsize >= tbl->max_slots) + return; + + p = &tbl->slots; + while (newsize--) + p = &(*p)->next; + while (*p) { + struct nfs4_slot *slot = *p; + + *p = slot->next; + kfree(slot); + tbl->max_slots--; + } +} + +/* + * nfs4_free_slot - free a slot and efficiently update slot table. + * + * freeing a slot is trivially done by clearing its respective bit + * in the bitmap. + * If the freed slotid equals highest_used_slotid we want to update it + * so that the server would be able to size down the slot table if needed, + * otherwise we know that the highest_used_slotid is still in use. + * When updating highest_used_slotid there may be "holes" in the bitmap + * so we need to scan down from highest_used_slotid to 0 looking for the now + * highest slotid in use. + * If none found, highest_used_slotid is set to NFS4_NO_SLOT. + * + * Must be called while holding tbl->slot_tbl_lock + */ +void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot) +{ + u32 slotid = slot->slot_nr; + + /* clear used bit in bitmap */ + __clear_bit(slotid, tbl->used_slots); + + /* update highest_used_slotid when it is freed */ + if (slotid == tbl->highest_used_slotid) { + u32 new_max = find_last_bit(tbl->used_slots, slotid); + if (new_max < slotid) + tbl->highest_used_slotid = new_max; + else { + tbl->highest_used_slotid = NFS4_NO_SLOT; + nfs4_session_drain_complete(tbl->session, tbl); + } + } + dprintk("%s: slotid %u highest_used_slotid %d\n", __func__, + slotid, tbl->highest_used_slotid); +} + +static struct nfs4_slot *nfs4_new_slot(struct nfs4_slot_table *tbl, + u32 slotid, u32 seq_init, gfp_t gfp_mask) +{ + struct nfs4_slot *slot; + + slot = kzalloc(sizeof(*slot), gfp_mask); + if (slot) { + slot->table = tbl; + slot->slot_nr = slotid; + slot->seq_nr = seq_init; + } + return slot; +} + +static struct nfs4_slot *nfs4_find_or_create_slot(struct nfs4_slot_table *tbl, + u32 slotid, u32 seq_init, gfp_t gfp_mask) +{ + struct nfs4_slot **p, *slot; + + p = &tbl->slots; + for (;;) { + if (*p == NULL) { + *p = nfs4_new_slot(tbl, tbl->max_slots, + seq_init, gfp_mask); + if (*p == NULL) + break; + tbl->max_slots++; + } + slot = *p; + if (slot->slot_nr == slotid) + return slot; + p = &slot->next; + } + return ERR_PTR(-ENOMEM); +} + +/* + * nfs4_alloc_slot - efficiently look for a free slot + * + * nfs4_alloc_slot looks for an unset bit in the used_slots bitmap. + * If found, we mark the slot as used, update the highest_used_slotid, + * and respectively set up the sequence operation args. + * + * Note: must be called with under the slot_tbl_lock. + */ +struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl) +{ + struct nfs4_slot *ret = ERR_PTR(-EBUSY); + u32 slotid; + + dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n", + __func__, tbl->used_slots[0], tbl->highest_used_slotid, + tbl->max_slotid + 1); + slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slotid + 1); + if (slotid > tbl->max_slotid) + goto out; + ret = nfs4_find_or_create_slot(tbl, slotid, 1, GFP_NOWAIT); + if (IS_ERR(ret)) + goto out; + __set_bit(slotid, tbl->used_slots); + if (slotid > tbl->highest_used_slotid || + tbl->highest_used_slotid == NFS4_NO_SLOT) + tbl->highest_used_slotid = slotid; + ret->renewal_time = jiffies; + ret->generation = tbl->generation; + +out: + dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n", + __func__, tbl->used_slots[0], tbl->highest_used_slotid, + !IS_ERR(ret) ? ret->slot_nr : -1); + return ret; +} + +static int nfs4_grow_slot_table(struct nfs4_slot_table *tbl, + u32 max_reqs, u32 ivalue) +{ + if (max_reqs <= tbl->max_slots) + return 0; + if (!IS_ERR(nfs4_find_or_create_slot(tbl, max_reqs - 1, ivalue, GFP_NOFS))) + return 0; + return -ENOMEM; +} + +static void nfs4_reset_slot_table(struct nfs4_slot_table *tbl, + u32 server_highest_slotid, + u32 ivalue) +{ + struct nfs4_slot **p; + + nfs4_shrink_slot_table(tbl, server_highest_slotid + 1); + p = &tbl->slots; + while (*p) { + (*p)->seq_nr = ivalue; + p = &(*p)->next; + } + tbl->highest_used_slotid = NFS4_NO_SLOT; + tbl->target_highest_slotid = server_highest_slotid; + tbl->server_highest_slotid = server_highest_slotid; + tbl->max_slotid = server_highest_slotid; +} + +/* + * (re)Initialise a slot table + */ +static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, + u32 max_reqs, u32 ivalue) +{ + int ret; + + dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__, + max_reqs, tbl->max_slots); + + if (max_reqs > NFS4_MAX_SLOT_TABLE) + max_reqs = NFS4_MAX_SLOT_TABLE; + + ret = nfs4_grow_slot_table(tbl, max_reqs, ivalue); + if (ret) + goto out; + + spin_lock(&tbl->slot_tbl_lock); + nfs4_reset_slot_table(tbl, max_reqs - 1, ivalue); + spin_unlock(&tbl->slot_tbl_lock); + + dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__, + tbl, tbl->slots, tbl->max_slots); +out: + dprintk("<-- %s: return %d\n", __func__, ret); + return ret; +} + +/* Destroy the slot table */ +static void nfs4_destroy_slot_tables(struct nfs4_session *session) +{ + nfs4_shrink_slot_table(&session->fc_slot_table, 0); + nfs4_shrink_slot_table(&session->bc_slot_table, 0); +} + +/* Update the client's idea of target_highest_slotid */ +static void nfs41_set_target_slotid_locked(struct nfs4_slot_table *tbl, + u32 target_highest_slotid) +{ + unsigned int max_slotid, i; + + if (tbl->target_highest_slotid == target_highest_slotid) + return; + tbl->target_highest_slotid = target_highest_slotid; + tbl->generation++; + + max_slotid = min(NFS4_MAX_SLOT_TABLE - 1, tbl->target_highest_slotid); + for (i = tbl->max_slotid + 1; i <= max_slotid; i++) + rpc_wake_up_next(&tbl->slot_tbl_waitq); + tbl->max_slotid = max_slotid; +} + +void nfs41_set_target_slotid(struct nfs4_slot_table *tbl, + u32 target_highest_slotid) +{ + spin_lock(&tbl->slot_tbl_lock); + nfs41_set_target_slotid_locked(tbl, target_highest_slotid); + spin_unlock(&tbl->slot_tbl_lock); +} + +static void nfs41_set_server_slotid_locked(struct nfs4_slot_table *tbl, + u32 highest_slotid) +{ + if (tbl->server_highest_slotid == highest_slotid) + return; + if (tbl->highest_used_slotid > highest_slotid) + return; + /* Deallocate slots */ + nfs4_shrink_slot_table(tbl, highest_slotid + 1); + tbl->server_highest_slotid = highest_slotid; +} + +void nfs41_update_target_slotid(struct nfs4_slot_table *tbl, + struct nfs4_slot *slot, + struct nfs4_sequence_res *res) +{ + spin_lock(&tbl->slot_tbl_lock); + if (tbl->generation != slot->generation) + goto out; + nfs41_set_server_slotid_locked(tbl, res->sr_highest_slotid); + nfs41_set_target_slotid_locked(tbl, res->sr_target_highest_slotid); +out: + spin_unlock(&tbl->slot_tbl_lock); +} + +/* + * Initialize or reset the forechannel and backchannel tables + */ +int nfs4_setup_session_slot_tables(struct nfs4_session *ses) +{ + struct nfs4_slot_table *tbl; + int status; + + dprintk("--> %s\n", __func__); + /* Fore channel */ + tbl = &ses->fc_slot_table; + tbl->session = ses; + status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1); + if (status) /* -ENOMEM */ + return status; + /* Back channel */ + tbl = &ses->bc_slot_table; + tbl->session = ses; + status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0); + if (status && tbl->slots == NULL) + /* Fore and back channel share a connection so get + * both slot tables or neither */ + nfs4_destroy_slot_tables(ses); + return status; +} + +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_NOFS); + if (!session) + return NULL; + + tbl = &session->fc_slot_table; + tbl->highest_used_slotid = NFS4_NO_SLOT; + spin_lock_init(&tbl->slot_tbl_lock); + rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table"); + init_completion(&tbl->complete); + + tbl = &session->bc_slot_table; + tbl->highest_used_slotid = NFS4_NO_SLOT; + spin_lock_init(&tbl->slot_tbl_lock); + rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table"); + init_completion(&tbl->complete); + + session->session_state = 1<clp = clp; + return session; +} + +void nfs4_destroy_session(struct nfs4_session *session) +{ + struct rpc_xprt *xprt; + struct rpc_cred *cred; + + cred = nfs4_get_exchange_id_cred(session->clp); + nfs4_proc_destroy_session(session, cred); + if (cred) + put_rpccred(cred); + + rcu_read_lock(); + xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt); + rcu_read_unlock(); + dprintk("%s Destroy backchannel for xprt %p\n", + __func__, xprt); + xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS); + nfs4_destroy_slot_tables(session); + kfree(session); +} + +/* + * With sessions, the client is not marked ready until after a + * successful EXCHANGE_ID and CREATE_SESSION. + * + * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate + * other versions of NFS can be tried. + */ +static int nfs41_check_session_ready(struct nfs_client *clp) +{ + int ret; + + if (clp->cl_cons_state == NFS_CS_SESSION_INITING) { + ret = nfs4_client_recover_expired_lease(clp); + if (ret) + return ret; + } + if (clp->cl_cons_state < NFS_CS_READY) + return -EPROTONOSUPPORT; + smp_rmb(); + return 0; +} + +int nfs4_init_session(struct nfs_server *server) +{ + struct nfs_client *clp = server->nfs_client; + struct nfs4_session *session; + unsigned int target_max_rqst_sz = NFS_MAX_FILE_IO_SIZE; + unsigned int target_max_resp_sz = NFS_MAX_FILE_IO_SIZE; + + if (!nfs4_has_session(clp)) + return 0; + + if (server->rsize != 0) + target_max_resp_sz = server->rsize; + target_max_resp_sz += nfs41_maxread_overhead; + + if (server->wsize != 0) + target_max_rqst_sz = server->wsize; + target_max_rqst_sz += nfs41_maxwrite_overhead; + + session = clp->cl_session; + spin_lock(&clp->cl_lock); + if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) { + /* Initialise targets and channel attributes */ + session->fc_target_max_rqst_sz = target_max_rqst_sz; + session->fc_attrs.max_rqst_sz = target_max_rqst_sz; + session->fc_target_max_resp_sz = target_max_resp_sz; + session->fc_attrs.max_resp_sz = target_max_resp_sz; + } else { + /* Just adjust the targets */ + if (target_max_rqst_sz > session->fc_target_max_rqst_sz) { + session->fc_target_max_rqst_sz = target_max_rqst_sz; + set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); + } + if (target_max_resp_sz > session->fc_target_max_resp_sz) { + session->fc_target_max_resp_sz = target_max_resp_sz; + set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); + } + } + spin_unlock(&clp->cl_lock); + + if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) + nfs4_schedule_lease_recovery(clp); + + return nfs41_check_session_ready(clp); +} + +int nfs4_init_ds_session(struct nfs_client *clp, unsigned long lease_time) +{ + struct nfs4_session *session = clp->cl_session; + int ret; + + spin_lock(&clp->cl_lock); + if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) { + /* + * Do not set NFS_CS_CHECK_LEASE_TIME instead set the + * DS lease to be equal to the MDS lease. + */ + clp->cl_lease_time = lease_time; + clp->cl_last_renewal = jiffies; + } + spin_unlock(&clp->cl_lock); + + ret = nfs41_check_session_ready(clp); + if (ret) + return ret; + /* Test for the DS role */ + if (!is_ds_client(clp)) + return -ENODEV; + return 0; +} +EXPORT_SYMBOL_GPL(nfs4_init_ds_session); + + diff --git a/fs/nfs/nfs4session.h b/fs/nfs/nfs4session.h new file mode 100644 index 000000000000..cb47b1eb0886 --- /dev/null +++ b/fs/nfs/nfs4session.h @@ -0,0 +1,35 @@ +/* + * fs/nfs/nfs4session.h + * + * Copyright (c) 2012 Trond Myklebust + * + */ +#ifndef __LINUX_FS_NFS_NFS4SESSION_H +#define __LINUX_FS_NFS_NFS4SESSION_H + +#if defined(CONFIG_NFS_V4_1) +extern struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl); +extern void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot); + +extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl, + u32 target_highest_slotid); +extern void nfs41_update_target_slotid(struct nfs4_slot_table *tbl, + struct nfs4_slot *slot, + struct nfs4_sequence_res *res); + +extern int nfs4_setup_session_slot_tables(struct nfs4_session *ses); + +extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp); +extern void nfs4_destroy_session(struct nfs4_session *session); +extern int nfs4_init_session(struct nfs_server *server); +extern int nfs4_init_ds_session(struct nfs_client *, unsigned long); + +#else /* defined(CONFIG_NFS_V4_1) */ + +static inline int nfs4_init_session(struct nfs_server *server) +{ + return 0; +} + +#endif /* defined(CONFIG_NFS_V4_1) */ +#endif /* __LINUX_FS_NFS_NFS4SESSION_H */