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653 lines
17 KiB
653 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* fs/nfs/nfs4session.c |
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* |
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* Copyright (c) 2012 Trond Myklebust <[email protected]> |
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* |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/errno.h> |
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#include <linux/string.h> |
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#include <linux/printk.h> |
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#include <linux/slab.h> |
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#include <linux/sunrpc/sched.h> |
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#include <linux/sunrpc/bc_xprt.h> |
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#include <linux/nfs.h> |
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#include <linux/nfs4.h> |
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#include <linux/nfs_fs.h> |
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#include <linux/module.h> |
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#include "nfs4_fs.h" |
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#include "internal.h" |
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#include "nfs4session.h" |
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#include "callback.h" |
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#define NFSDBG_FACILITY NFSDBG_STATE |
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static void nfs4_init_slot_table(struct nfs4_slot_table *tbl, const char *queue) |
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{ |
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tbl->highest_used_slotid = NFS4_NO_SLOT; |
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spin_lock_init(&tbl->slot_tbl_lock); |
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rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, queue); |
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init_waitqueue_head(&tbl->slot_waitq); |
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init_completion(&tbl->complete); |
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} |
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/* |
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* nfs4_shrink_slot_table - free retired slots from the slot table |
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*/ |
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static void nfs4_shrink_slot_table(struct nfs4_slot_table *tbl, u32 newsize) |
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{ |
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struct nfs4_slot **p; |
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if (newsize >= tbl->max_slots) |
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return; |
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p = &tbl->slots; |
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while (newsize--) |
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p = &(*p)->next; |
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while (*p) { |
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struct nfs4_slot *slot = *p; |
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*p = slot->next; |
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kfree(slot); |
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tbl->max_slots--; |
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} |
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} |
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/** |
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* nfs4_slot_tbl_drain_complete - wake waiters when drain is complete |
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* @tbl: controlling slot table |
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* |
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*/ |
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void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl) |
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{ |
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if (nfs4_slot_tbl_draining(tbl)) |
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complete(&tbl->complete); |
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} |
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/* |
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* nfs4_free_slot - free a slot and efficiently update slot table. |
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* |
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* freeing a slot is trivially done by clearing its respective bit |
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* in the bitmap. |
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* If the freed slotid equals highest_used_slotid we want to update it |
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* so that the server would be able to size down the slot table if needed, |
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* otherwise we know that the highest_used_slotid is still in use. |
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* When updating highest_used_slotid there may be "holes" in the bitmap |
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* so we need to scan down from highest_used_slotid to 0 looking for the now |
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* highest slotid in use. |
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* If none found, highest_used_slotid is set to NFS4_NO_SLOT. |
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* |
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* Must be called while holding tbl->slot_tbl_lock |
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*/ |
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void nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot) |
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{ |
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u32 slotid = slot->slot_nr; |
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/* clear used bit in bitmap */ |
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__clear_bit(slotid, tbl->used_slots); |
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/* update highest_used_slotid when it is freed */ |
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if (slotid == tbl->highest_used_slotid) { |
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u32 new_max = find_last_bit(tbl->used_slots, slotid); |
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if (new_max < slotid) |
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tbl->highest_used_slotid = new_max; |
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else { |
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tbl->highest_used_slotid = NFS4_NO_SLOT; |
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nfs4_slot_tbl_drain_complete(tbl); |
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} |
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} |
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dprintk("%s: slotid %u highest_used_slotid %u\n", __func__, |
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slotid, tbl->highest_used_slotid); |
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} |
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static struct nfs4_slot *nfs4_new_slot(struct nfs4_slot_table *tbl, |
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u32 slotid, u32 seq_init, gfp_t gfp_mask) |
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{ |
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struct nfs4_slot *slot; |
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slot = kzalloc(sizeof(*slot), gfp_mask); |
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if (slot) { |
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slot->table = tbl; |
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slot->slot_nr = slotid; |
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slot->seq_nr = seq_init; |
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slot->seq_nr_highest_sent = seq_init; |
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slot->seq_nr_last_acked = seq_init - 1; |
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} |
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return slot; |
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} |
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static struct nfs4_slot *nfs4_find_or_create_slot(struct nfs4_slot_table *tbl, |
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u32 slotid, u32 seq_init, gfp_t gfp_mask) |
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{ |
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struct nfs4_slot **p, *slot; |
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p = &tbl->slots; |
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for (;;) { |
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if (*p == NULL) { |
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*p = nfs4_new_slot(tbl, tbl->max_slots, |
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seq_init, gfp_mask); |
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if (*p == NULL) |
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break; |
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tbl->max_slots++; |
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} |
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slot = *p; |
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if (slot->slot_nr == slotid) |
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return slot; |
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p = &slot->next; |
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} |
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return ERR_PTR(-ENOMEM); |
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} |
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static void nfs4_lock_slot(struct nfs4_slot_table *tbl, |
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struct nfs4_slot *slot) |
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{ |
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u32 slotid = slot->slot_nr; |
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__set_bit(slotid, tbl->used_slots); |
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if (slotid > tbl->highest_used_slotid || |
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tbl->highest_used_slotid == NFS4_NO_SLOT) |
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tbl->highest_used_slotid = slotid; |
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slot->generation = tbl->generation; |
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} |
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/* |
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* nfs4_try_to_lock_slot - Given a slot try to allocate it |
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* |
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* Note: must be called with the slot_tbl_lock held. |
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*/ |
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bool nfs4_try_to_lock_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot) |
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{ |
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if (nfs4_test_locked_slot(tbl, slot->slot_nr)) |
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return false; |
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nfs4_lock_slot(tbl, slot); |
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return true; |
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} |
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/* |
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* nfs4_lookup_slot - Find a slot but don't allocate it |
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* |
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* Note: must be called with the slot_tbl_lock held. |
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*/ |
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struct nfs4_slot *nfs4_lookup_slot(struct nfs4_slot_table *tbl, u32 slotid) |
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{ |
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if (slotid <= tbl->max_slotid) |
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return nfs4_find_or_create_slot(tbl, slotid, 0, GFP_NOWAIT); |
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return ERR_PTR(-E2BIG); |
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} |
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static int nfs4_slot_get_seqid(struct nfs4_slot_table *tbl, u32 slotid, |
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u32 *seq_nr) |
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__must_hold(&tbl->slot_tbl_lock) |
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{ |
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struct nfs4_slot *slot; |
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int ret; |
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slot = nfs4_lookup_slot(tbl, slotid); |
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ret = PTR_ERR_OR_ZERO(slot); |
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if (!ret) |
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*seq_nr = slot->seq_nr; |
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return ret; |
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} |
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/* |
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* nfs4_slot_seqid_in_use - test if a slot sequence id is still in use |
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* |
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* Given a slot table, slot id and sequence number, determine if the |
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* RPC call in question is still in flight. This function is mainly |
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* intended for use by the callback channel. |
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*/ |
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static bool nfs4_slot_seqid_in_use(struct nfs4_slot_table *tbl, |
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u32 slotid, u32 seq_nr) |
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{ |
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u32 cur_seq = 0; |
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bool ret = false; |
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spin_lock(&tbl->slot_tbl_lock); |
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if (nfs4_slot_get_seqid(tbl, slotid, &cur_seq) == 0 && |
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cur_seq == seq_nr && test_bit(slotid, tbl->used_slots)) |
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ret = true; |
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spin_unlock(&tbl->slot_tbl_lock); |
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return ret; |
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} |
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/* |
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* nfs4_slot_wait_on_seqid - wait until a slot sequence id is complete |
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* |
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* Given a slot table, slot id and sequence number, wait until the |
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* corresponding RPC call completes. This function is mainly |
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* intended for use by the callback channel. |
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*/ |
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int nfs4_slot_wait_on_seqid(struct nfs4_slot_table *tbl, |
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u32 slotid, u32 seq_nr, |
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unsigned long timeout) |
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{ |
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if (wait_event_timeout(tbl->slot_waitq, |
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!nfs4_slot_seqid_in_use(tbl, slotid, seq_nr), |
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timeout) == 0) |
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return -ETIMEDOUT; |
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return 0; |
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} |
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/* |
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* nfs4_alloc_slot - efficiently look for a free slot |
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* |
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* nfs4_alloc_slot looks for an unset bit in the used_slots bitmap. |
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* If found, we mark the slot as used, update the highest_used_slotid, |
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* and respectively set up the sequence operation args. |
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* |
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* Note: must be called with under the slot_tbl_lock. |
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*/ |
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struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl) |
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{ |
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struct nfs4_slot *ret = ERR_PTR(-EBUSY); |
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u32 slotid; |
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dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n", |
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__func__, tbl->used_slots[0], tbl->highest_used_slotid, |
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tbl->max_slotid + 1); |
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slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slotid + 1); |
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if (slotid <= tbl->max_slotid) { |
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ret = nfs4_find_or_create_slot(tbl, slotid, 1, GFP_NOWAIT); |
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if (!IS_ERR(ret)) |
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nfs4_lock_slot(tbl, ret); |
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} |
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dprintk("<-- %s used_slots=%04lx highest_used=%u slotid=%u\n", |
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__func__, tbl->used_slots[0], tbl->highest_used_slotid, |
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!IS_ERR(ret) ? ret->slot_nr : NFS4_NO_SLOT); |
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return ret; |
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} |
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static int nfs4_grow_slot_table(struct nfs4_slot_table *tbl, |
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u32 max_reqs, u32 ivalue) |
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{ |
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if (max_reqs <= tbl->max_slots) |
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return 0; |
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if (!IS_ERR(nfs4_find_or_create_slot(tbl, max_reqs - 1, ivalue, GFP_NOFS))) |
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return 0; |
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return -ENOMEM; |
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} |
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static void nfs4_reset_slot_table(struct nfs4_slot_table *tbl, |
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u32 server_highest_slotid, |
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u32 ivalue) |
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{ |
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struct nfs4_slot **p; |
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nfs4_shrink_slot_table(tbl, server_highest_slotid + 1); |
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p = &tbl->slots; |
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while (*p) { |
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(*p)->seq_nr = ivalue; |
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(*p)->seq_nr_highest_sent = ivalue; |
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(*p)->seq_nr_last_acked = ivalue - 1; |
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p = &(*p)->next; |
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} |
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tbl->highest_used_slotid = NFS4_NO_SLOT; |
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tbl->target_highest_slotid = server_highest_slotid; |
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tbl->server_highest_slotid = server_highest_slotid; |
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tbl->d_target_highest_slotid = 0; |
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tbl->d2_target_highest_slotid = 0; |
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tbl->max_slotid = server_highest_slotid; |
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} |
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/* |
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* (re)Initialise a slot table |
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*/ |
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static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, |
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u32 max_reqs, u32 ivalue) |
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{ |
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int ret; |
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dprintk("--> %s: max_reqs=%u, tbl->max_slots %u\n", __func__, |
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max_reqs, tbl->max_slots); |
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if (max_reqs > NFS4_MAX_SLOT_TABLE) |
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max_reqs = NFS4_MAX_SLOT_TABLE; |
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ret = nfs4_grow_slot_table(tbl, max_reqs, ivalue); |
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if (ret) |
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goto out; |
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spin_lock(&tbl->slot_tbl_lock); |
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nfs4_reset_slot_table(tbl, max_reqs - 1, ivalue); |
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spin_unlock(&tbl->slot_tbl_lock); |
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dprintk("%s: tbl=%p slots=%p max_slots=%u\n", __func__, |
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tbl, tbl->slots, tbl->max_slots); |
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out: |
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dprintk("<-- %s: return %d\n", __func__, ret); |
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return ret; |
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} |
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/* |
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* nfs4_release_slot_table - release all slot table entries |
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*/ |
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static void nfs4_release_slot_table(struct nfs4_slot_table *tbl) |
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{ |
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nfs4_shrink_slot_table(tbl, 0); |
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} |
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/** |
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* nfs4_shutdown_slot_table - release resources attached to a slot table |
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* @tbl: slot table to shut down |
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* |
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*/ |
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void nfs4_shutdown_slot_table(struct nfs4_slot_table *tbl) |
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{ |
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nfs4_release_slot_table(tbl); |
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rpc_destroy_wait_queue(&tbl->slot_tbl_waitq); |
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} |
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/** |
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* nfs4_setup_slot_table - prepare a stand-alone slot table for use |
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* @tbl: slot table to set up |
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* @max_reqs: maximum number of requests allowed |
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* @queue: name to give RPC wait queue |
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* |
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* Returns zero on success, or a negative errno. |
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*/ |
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int nfs4_setup_slot_table(struct nfs4_slot_table *tbl, unsigned int max_reqs, |
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const char *queue) |
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{ |
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nfs4_init_slot_table(tbl, queue); |
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return nfs4_realloc_slot_table(tbl, max_reqs, 0); |
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} |
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static bool nfs41_assign_slot(struct rpc_task *task, void *pslot) |
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{ |
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struct nfs4_sequence_args *args = task->tk_msg.rpc_argp; |
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struct nfs4_sequence_res *res = task->tk_msg.rpc_resp; |
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struct nfs4_slot *slot = pslot; |
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struct nfs4_slot_table *tbl = slot->table; |
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if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) |
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return false; |
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slot->generation = tbl->generation; |
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args->sa_slot = slot; |
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res->sr_timestamp = jiffies; |
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res->sr_slot = slot; |
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res->sr_status_flags = 0; |
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res->sr_status = 1; |
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return true; |
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} |
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static bool __nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl, |
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struct nfs4_slot *slot) |
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{ |
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if (rpc_wake_up_first(&tbl->slot_tbl_waitq, nfs41_assign_slot, slot)) |
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return true; |
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return false; |
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} |
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bool nfs41_wake_and_assign_slot(struct nfs4_slot_table *tbl, |
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struct nfs4_slot *slot) |
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{ |
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if (slot->slot_nr > tbl->max_slotid) |
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return false; |
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return __nfs41_wake_and_assign_slot(tbl, slot); |
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} |
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static bool nfs41_try_wake_next_slot_table_entry(struct nfs4_slot_table *tbl) |
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{ |
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struct nfs4_slot *slot = nfs4_alloc_slot(tbl); |
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if (!IS_ERR(slot)) { |
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bool ret = __nfs41_wake_and_assign_slot(tbl, slot); |
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if (ret) |
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return ret; |
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nfs4_free_slot(tbl, slot); |
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} |
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return false; |
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} |
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void nfs41_wake_slot_table(struct nfs4_slot_table *tbl) |
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{ |
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for (;;) { |
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if (!nfs41_try_wake_next_slot_table_entry(tbl)) |
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break; |
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} |
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} |
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#if defined(CONFIG_NFS_V4_1) |
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static void nfs41_set_max_slotid_locked(struct nfs4_slot_table *tbl, |
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u32 target_highest_slotid) |
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{ |
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u32 max_slotid; |
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max_slotid = min(NFS4_MAX_SLOT_TABLE - 1, target_highest_slotid); |
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if (max_slotid > tbl->server_highest_slotid) |
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max_slotid = tbl->server_highest_slotid; |
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if (max_slotid > tbl->target_highest_slotid) |
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max_slotid = tbl->target_highest_slotid; |
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tbl->max_slotid = max_slotid; |
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nfs41_wake_slot_table(tbl); |
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} |
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/* Update the client's idea of target_highest_slotid */ |
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static void nfs41_set_target_slotid_locked(struct nfs4_slot_table *tbl, |
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u32 target_highest_slotid) |
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{ |
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if (tbl->target_highest_slotid == target_highest_slotid) |
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return; |
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tbl->target_highest_slotid = target_highest_slotid; |
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tbl->generation++; |
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} |
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void nfs41_set_target_slotid(struct nfs4_slot_table *tbl, |
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u32 target_highest_slotid) |
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{ |
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spin_lock(&tbl->slot_tbl_lock); |
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nfs41_set_target_slotid_locked(tbl, target_highest_slotid); |
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tbl->d_target_highest_slotid = 0; |
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tbl->d2_target_highest_slotid = 0; |
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nfs41_set_max_slotid_locked(tbl, target_highest_slotid); |
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spin_unlock(&tbl->slot_tbl_lock); |
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} |
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static void nfs41_set_server_slotid_locked(struct nfs4_slot_table *tbl, |
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u32 highest_slotid) |
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{ |
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if (tbl->server_highest_slotid == highest_slotid) |
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return; |
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if (tbl->highest_used_slotid > highest_slotid) |
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return; |
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/* Deallocate slots */ |
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nfs4_shrink_slot_table(tbl, highest_slotid + 1); |
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tbl->server_highest_slotid = highest_slotid; |
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} |
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static s32 nfs41_derivative_target_slotid(s32 s1, s32 s2) |
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{ |
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s1 -= s2; |
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if (s1 == 0) |
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return 0; |
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if (s1 < 0) |
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return (s1 - 1) >> 1; |
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return (s1 + 1) >> 1; |
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} |
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static int nfs41_sign_s32(s32 s1) |
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{ |
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if (s1 > 0) |
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return 1; |
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if (s1 < 0) |
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return -1; |
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return 0; |
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} |
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static bool nfs41_same_sign_or_zero_s32(s32 s1, s32 s2) |
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{ |
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if (!s1 || !s2) |
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return true; |
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return nfs41_sign_s32(s1) == nfs41_sign_s32(s2); |
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} |
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|
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/* Try to eliminate outliers by checking for sharp changes in the |
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* derivatives and second derivatives |
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*/ |
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static bool nfs41_is_outlier_target_slotid(struct nfs4_slot_table *tbl, |
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u32 new_target) |
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{ |
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s32 d_target, d2_target; |
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bool ret = true; |
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d_target = nfs41_derivative_target_slotid(new_target, |
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tbl->target_highest_slotid); |
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d2_target = nfs41_derivative_target_slotid(d_target, |
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tbl->d_target_highest_slotid); |
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/* Is first derivative same sign? */ |
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if (nfs41_same_sign_or_zero_s32(d_target, tbl->d_target_highest_slotid)) |
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ret = false; |
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/* Is second derivative same sign? */ |
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if (nfs41_same_sign_or_zero_s32(d2_target, tbl->d2_target_highest_slotid)) |
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ret = false; |
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tbl->d_target_highest_slotid = d_target; |
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tbl->d2_target_highest_slotid = d2_target; |
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return ret; |
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} |
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|
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void nfs41_update_target_slotid(struct nfs4_slot_table *tbl, |
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struct nfs4_slot *slot, |
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struct nfs4_sequence_res *res) |
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{ |
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spin_lock(&tbl->slot_tbl_lock); |
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if (!nfs41_is_outlier_target_slotid(tbl, res->sr_target_highest_slotid)) |
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nfs41_set_target_slotid_locked(tbl, res->sr_target_highest_slotid); |
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if (tbl->generation == slot->generation) |
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nfs41_set_server_slotid_locked(tbl, res->sr_highest_slotid); |
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nfs41_set_max_slotid_locked(tbl, res->sr_target_highest_slotid); |
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spin_unlock(&tbl->slot_tbl_lock); |
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} |
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|
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static void nfs4_release_session_slot_tables(struct nfs4_session *session) |
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{ |
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nfs4_release_slot_table(&session->fc_slot_table); |
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nfs4_release_slot_table(&session->bc_slot_table); |
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} |
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|
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/* |
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* Initialize or reset the forechannel and backchannel tables |
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*/ |
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int nfs4_setup_session_slot_tables(struct nfs4_session *ses) |
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{ |
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struct nfs4_slot_table *tbl; |
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int status; |
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|
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dprintk("--> %s\n", __func__); |
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/* Fore channel */ |
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tbl = &ses->fc_slot_table; |
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tbl->session = ses; |
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status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1); |
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if (status || !(ses->flags & SESSION4_BACK_CHAN)) /* -ENOMEM */ |
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return status; |
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/* Back channel */ |
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tbl = &ses->bc_slot_table; |
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tbl->session = ses; |
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status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0); |
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if (status && tbl->slots == NULL) |
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/* Fore and back channel share a connection so get |
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* both slot tables or neither */ |
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nfs4_release_session_slot_tables(ses); |
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return status; |
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} |
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|
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struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp) |
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{ |
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struct nfs4_session *session; |
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|
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session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS); |
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if (!session) |
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return NULL; |
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|
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nfs4_init_slot_table(&session->fc_slot_table, "ForeChannel Slot table"); |
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nfs4_init_slot_table(&session->bc_slot_table, "BackChannel Slot table"); |
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session->session_state = 1<<NFS4_SESSION_INITING; |
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|
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session->clp = clp; |
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return session; |
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} |
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|
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static void nfs4_destroy_session_slot_tables(struct nfs4_session *session) |
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{ |
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nfs4_shutdown_slot_table(&session->fc_slot_table); |
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nfs4_shutdown_slot_table(&session->bc_slot_table); |
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} |
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|
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void nfs4_destroy_session(struct nfs4_session *session) |
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{ |
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struct rpc_xprt *xprt; |
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const struct cred *cred; |
|
|
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cred = nfs4_get_clid_cred(session->clp); |
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nfs4_proc_destroy_session(session, cred); |
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put_cred(cred); |
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|
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rcu_read_lock(); |
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xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt); |
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rcu_read_unlock(); |
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dprintk("%s Destroy backchannel for xprt %p\n", |
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__func__, xprt); |
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xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS); |
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nfs4_destroy_session_slot_tables(session); |
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kfree(session); |
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} |
|
|
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/* |
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* With sessions, the client is not marked ready until after a |
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* successful EXCHANGE_ID and CREATE_SESSION. |
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* |
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* Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate |
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* other versions of NFS can be tried. |
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*/ |
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static int nfs41_check_session_ready(struct nfs_client *clp) |
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{ |
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int ret; |
|
|
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if (clp->cl_cons_state == NFS_CS_SESSION_INITING) { |
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ret = nfs4_client_recover_expired_lease(clp); |
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if (ret) |
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return ret; |
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} |
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if (clp->cl_cons_state < NFS_CS_READY) |
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return -EPROTONOSUPPORT; |
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smp_rmb(); |
|
return 0; |
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} |
|
|
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int nfs4_init_session(struct nfs_client *clp) |
|
{ |
|
if (!nfs4_has_session(clp)) |
|
return 0; |
|
|
|
clear_bit(NFS4_SESSION_INITING, &clp->cl_session->session_state); |
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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); |
|
|
|
#endif /* defined(CONFIG_NFS_V4_1) */
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