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NFSv4.1: Reset the sequence number for slots that have been deallocated 

When the server tells us that it is dynamically resizing the session
replay cache, we should reset the sequence number for those slots
that have been deallocated.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-11-20 18:10:30 -05:00
parent 464ee9f966
commit da0507b7c9
4 changed files with 22 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
fs/nfs/nfs4proc.c
View File

@ -498,6 +498,22 @@ static void nfs41_set_target_slotid_locked(struct nfs4_slot_table *tbl,
tbl->generation++;
}
static void nfs41_set_server_slotid_locked(struct nfs4_slot_table *tbl,
u32 highest_slotid)
{
unsigned int max_slotid, i;
if (tbl->server_highest_slotid == highest_slotid)
return;
if (tbl->highest_used_slotid > highest_slotid)
return;
max_slotid = min(tbl->max_slots - 1, highest_slotid);
/* Reset the seq_nr for deallocated slots */
for (i = tbl->server_highest_slotid + 1; i <= max_slotid; i++)
tbl->slots[i].seq_nr = 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)
@ -505,6 +521,7 @@ static void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
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);
@ -5718,6 +5735,7 @@ static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
}
tbl->highest_used_slotid = NFS4_NO_SLOT;
tbl->target_highest_slotid = max_slots - 1;
tbl->server_highest_slotid = max_slots - 1;
for (i = 0; i < tbl->max_slots; i++)
tbl->slots[i].seq_nr = ivalue;
spin_unlock(&tbl->slot_tbl_lock);

4
fs/nfs/nfs4xdr.c
View File

@ -5550,8 +5550,8 @@ static int decode_sequence(struct xdr_stream *xdr,
dprintk("%s Invalid slot id\n", __func__);
goto out_err;
}
/* highest slot id - currently not processed */
dummy = be32_to_cpup(p++);
/* highest slot id */
res->sr_highest_slotid = be32_to_cpup(p++);
/* target highest slot id */
res->sr_target_highest_slotid = be32_to_cpup(p++);
/* result flags */

1
include/linux/nfs_fs_sb.h
View File

@ -218,6 +218,7 @@ struct nfs4_slot_table {
u32 highest_used_slotid; /* sent to server on each SEQ.
* op for dynamic resizing */
u32 target_highest_slotid; /* Server max_slot target */
u32 server_highest_slotid; /* Server highest slotid */
unsigned long generation; /* Generation counter for
target_highest_slotid */
struct completion complete;

1
include/linux/nfs_xdr.h
View File

@ -203,6 +203,7 @@ struct nfs4_sequence_res {
struct nfs4_slot *sr_slot; /* slot used to send request */
int sr_status; /* sequence operation status */
u32 sr_status_flags;
u32 sr_highest_slotid;
u32 sr_target_highest_slotid;
};