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nfsd4: add a separate (lockowner, inode) lookup

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Address the possible performance regression mentioned in "nfsd4: hash
lockowners to simplify RELEASE_LOCKOWNER" by providing a separate
(lockowner, inode) hash.

Really, I doubt this matters much, but I think it's likely we'll change
these data structures here and I'd rather that the need for (owner,
inode) lookups be well-documented.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2011-11-07 17:40:10 -05:00
parent 353de31b86
commit 009673b439
2 changed files with 24 additions and 6 deletions
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29
fs/nfsd/nfs4state.c
View File

@ -514,6 +514,7 @@ static void unhash_lockowner(struct nfs4_lockowner *lo)
list_del(&lo->lo_owner.so_strhash);
list_del(&lo->lo_perstateid);
list_del(&lo->lo_owner_ino_hash);
while (!list_empty(&lo->lo_owner.so_stateids)) {
stp = list_first_entry(&lo->lo_owner.so_stateids,
struct nfs4_ol_stateid, st_perstateowner);
@ -3722,6 +3723,10 @@ out:
#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
#define LOCKOWNER_INO_HASH_BITS 8
#define LOCKOWNER_INO_HASH_SIZE (1 << LOCKOWNER_INO_HASH_BITS)
#define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1)
static inline u64
end_offset(u64 start, u64 len)
{
@ -3742,6 +3747,15 @@ last_byte_offset(u64 start, u64 len)
return end > start ? end - 1: NFS4_MAX_UINT64;
}
static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct xdr_netobj *ownername)
{
return (file_hashval(inode) + cl_id
+ opaque_hashval(ownername->data, ownername->len))
& LOCKOWNER_INO_HASH_MASK;
}
static struct list_head lockowner_ino_hashtbl[LOCKOWNER_INO_HASH_SIZE];
/*
* TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
* we can't properly handle lock requests that go beyond the (2^63 - 1)-th
@ -3809,14 +3823,10 @@ static struct nfs4_lockowner *
find_lockowner_str(struct inode *inode, clientid_t *clid,
struct xdr_netobj *owner)
{
unsigned int hashval = ownerstr_hashval(clid->cl_id, owner);
unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner);
struct nfs4_lockowner *lo;
struct nfs4_stateowner *op;
list_for_each_entry(op, &ownerstr_hashtbl[hashval], so_strhash) {
if (op->so_is_open_owner)
continue;
lo = lockowner(op);
list_for_each_entry(lo, &lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
if (same_lockowner_ino(lo, inode, clid, owner))
return lo;
}
@ -3825,7 +3835,12 @@ find_lockowner_str(struct inode *inode, clientid_t *clid,
static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp)
{
struct inode *inode = open_stp->st_file->fi_inode;
unsigned int inohash = lockowner_ino_hashval(inode,
clp->cl_clientid.cl_id, &lo->lo_owner.so_owner);
list_add(&lo->lo_owner.so_strhash, &ownerstr_hashtbl[strhashval]);
list_add(&lo->lo_owner_ino_hash, &lockowner_ino_hashtbl[inohash]);
list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
}
@ -4548,6 +4563,8 @@ nfs4_state_init(void)
for (i = 0; i < OWNER_HASH_SIZE; i++) {
INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
}
for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
INIT_LIST_HEAD(&lockowner_ino_hashtbl[i]);
memset(&onestateid, ~0, sizeof(stateid_t));
INIT_LIST_HEAD(&close_lru);
INIT_LIST_HEAD(&client_lru);

1
fs/nfsd/state.h
View File

@ -366,6 +366,7 @@ struct nfs4_openowner {
struct nfs4_lockowner {
struct nfs4_stateowner lo_owner; /* must be first element */
struct list_head lo_owner_ino_hash; /* hash by owner,file */
struct list_head lo_perstateid; /* for lockowners only */
struct list_head lo_list; /* for temporary uses */
};