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NFSv4.x: Allow multiple callbacks in flight

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Hook the callback channel into the same session management machinery
as we use for the forward channel.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust
2016-01-23 15:18:18 -05:00
parent 5f83d86cf5
commit 810d82e683
5 changed files with 69 additions and 22 deletions
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54
fs/nfs/nfs4session.c
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@@ -135,6 +135,43 @@ static struct nfs4_slot *nfs4_find_or_create_slot(struct nfs4_slot_table *tbl,
return ERR_PTR(-ENOMEM);
}
static void nfs4_lock_slot(struct nfs4_slot_table *tbl,
struct nfs4_slot *slot)
{
u32 slotid = slot->slot_nr;
__set_bit(slotid, tbl->used_slots);
if (slotid > tbl->highest_used_slotid ||
tbl->highest_used_slotid == NFS4_NO_SLOT)
tbl->highest_used_slotid = slotid;
slot->generation = tbl->generation;
}
/*
* nfs4_try_to_lock_slot - Given a slot try to allocate it
*
* Note: must be called with the slot_tbl_lock held.
*/
bool nfs4_try_to_lock_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot)
{
if (nfs4_test_locked_slot(tbl, slot->slot_nr))
return false;
nfs4_lock_slot(tbl, slot);
return true;
}
/*
* nfs4_lookup_slot - Find a slot but don't allocate it
*
* Note: must be called with the slot_tbl_lock held.
*/
struct nfs4_slot *nfs4_lookup_slot(struct nfs4_slot_table *tbl, u32 slotid)
{
if (slotid <= tbl->max_slotid)
return nfs4_find_or_create_slot(tbl, slotid, 1, GFP_NOWAIT);
return ERR_PTR(-E2BIG);
}
/*
* nfs4_alloc_slot - efficiently look for a free slot
*
@@ -153,18 +190,11 @@ struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl)
__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->generation = tbl->generation;
out:
if (slotid <= tbl->max_slotid) {
ret = nfs4_find_or_create_slot(tbl, slotid, 1, GFP_NOWAIT);
if (!IS_ERR(ret))
nfs4_lock_slot(tbl, ret);
}
dprintk("<-- %s used_slots=%04lx highest_used=%u slotid=%u\n",
__func__, tbl->used_slots[0], tbl->highest_used_slotid,
!IS_ERR(ret) ? ret->slot_nr : NFS4_NO_SLOT);