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nfsd: convert the file_hashtbl to a hlist 

We only ever traverse the hash chains in the forward direction, so a
double pointer list head isn't really necessary.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2013-04-02 09:01:59 -04:00 committed by J. Bruce Fields
parent 66b2b9b2b0
commit 89876f8c0d
2 changed files with 5 additions and 11 deletions
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14
fs/nfsd/nfs4state.c
View File

@ -236,7 +236,7 @@ static inline void
put_nfs4_file(struct nfs4_file *fi) put_nfs4_file(struct nfs4_file *fi)
{ {
if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) { if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
list_del(&fi->fi_hash); hlist_del(&fi->fi_hash);
spin_unlock(&recall_lock); spin_unlock(&recall_lock);
iput(fi->fi_inode); iput(fi->fi_inode);
nfsd4_free_file(fi); nfsd4_free_file(fi);
@ -280,7 +280,7 @@ static unsigned int file_hashval(struct inode *ino)
return hash_ptr(ino, FILE_HASH_BITS); return hash_ptr(ino, FILE_HASH_BITS);
} }
static struct list_head file_hashtbl[FILE_HASH_SIZE]; static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag) static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
{ {
@ -2347,7 +2347,6 @@ static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
unsigned int hashval = file_hashval(ino); unsigned int hashval = file_hashval(ino);
atomic_set(&fp->fi_ref, 1); atomic_set(&fp->fi_ref, 1);
INIT_LIST_HEAD(&fp->fi_hash);
INIT_LIST_HEAD(&fp->fi_stateids); INIT_LIST_HEAD(&fp->fi_stateids);
INIT_LIST_HEAD(&fp->fi_delegations); INIT_LIST_HEAD(&fp->fi_delegations);
fp->fi_inode = igrab(ino); fp->fi_inode = igrab(ino);
@ -2356,7 +2355,7 @@ static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
memset(fp->fi_fds, 0, sizeof(fp->fi_fds)); memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
memset(fp->fi_access, 0, sizeof(fp->fi_access)); memset(fp->fi_access, 0, sizeof(fp->fi_access));
spin_lock(&recall_lock); spin_lock(&recall_lock);
list_add(&fp->fi_hash, &file_hashtbl[hashval]); hlist_add_head(&fp->fi_hash, &file_hashtbl[hashval]);
spin_unlock(&recall_lock); spin_unlock(&recall_lock);
} }
@ -2542,7 +2541,7 @@ find_file(struct inode *ino)
struct nfs4_file *fp; struct nfs4_file *fp;
spin_lock(&recall_lock); spin_lock(&recall_lock);
list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) { hlist_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
if (fp->fi_inode == ino) { if (fp->fi_inode == ino) {
get_nfs4_file(fp); get_nfs4_file(fp);
spin_unlock(&recall_lock); spin_unlock(&recall_lock);
@ -4810,11 +4809,6 @@ struct nfs4_client *nfsd_find_client(struct sockaddr_storage *addr, size_t addr_
void void
nfs4_state_init(void) nfs4_state_init(void)
{ {
int i;
for (i = 0; i < FILE_HASH_SIZE; i++) {
INIT_LIST_HEAD(&file_hashtbl[i]);
}
INIT_LIST_HEAD(&del_recall_lru); INIT_LIST_HEAD(&del_recall_lru);
} }

2
fs/nfsd/state.h
View File

@ -380,7 +380,7 @@ static inline struct nfs4_lockowner * lockowner(struct nfs4_stateowner *so)
/* nfs4_file: a file opened by some number of (open) nfs4_stateowners. */ /* nfs4_file: a file opened by some number of (open) nfs4_stateowners. */
struct nfs4_file { struct nfs4_file {
atomic_t fi_ref; atomic_t fi_ref;
struct list_head fi_hash; /* hash by "struct inode *" */ struct hlist_node fi_hash; /* hash by "struct inode *" */
struct list_head fi_stateids; struct list_head fi_stateids;
struct list_head fi_delegations; struct list_head fi_delegations;
/* One each for O_RDONLY, O_WRONLY, O_RDWR: */ /* One each for O_RDONLY, O_WRONLY, O_RDWR: */