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NFS: Add a global LRU list for the ACCESS cache

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...in order to allow the addition of a memory shrinker.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2006-07-25 11:28:18 -04:00
parent 1c3c07e9f6
commit cfcea3e8c6
3 changed files with 40 additions and 1 deletions
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35
fs/nfs/dir.c
View File

@ -1638,10 +1638,17 @@ out:
return error;
}
static DEFINE_SPINLOCK(nfs_access_lru_lock);
static LIST_HEAD(nfs_access_lru_list);
static atomic_long_t nfs_access_nr_entries;
static void nfs_access_free_entry(struct nfs_access_entry *entry)
{
put_rpccred(entry->cred);
kfree(entry);
smp_mb__before_atomic_dec();
atomic_long_dec(&nfs_access_nr_entries);
smp_mb__after_atomic_dec();
}
static void __nfs_access_zap_cache(struct inode *inode)
@ -1655,6 +1662,7 @@ static void __nfs_access_zap_cache(struct inode *inode)
while ((n = rb_first(root_node)) != NULL) {
entry = rb_entry(n, struct nfs_access_entry, rb_node);
rb_erase(n, root_node);
list_del(&entry->lru);
n->rb_left = dispose;
dispose = n;
}
@ -1671,6 +1679,13 @@ static void __nfs_access_zap_cache(struct inode *inode)
void nfs_access_zap_cache(struct inode *inode)
{
/* Remove from global LRU init */
if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_FLAGS(inode))) {
spin_lock(&nfs_access_lru_lock);
list_del_init(&NFS_I(inode)->access_cache_inode_lru);
spin_unlock(&nfs_access_lru_lock);
}
spin_lock(&inode->i_lock);
/* This will release the spinlock */
__nfs_access_zap_cache(inode);
@ -1711,12 +1726,14 @@ int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs
res->jiffies = cache->jiffies;
res->cred = cache->cred;
res->mask = cache->mask;
list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru);
err = 0;
out:
spin_unlock(&inode->i_lock);
return err;
out_stale:
rb_erase(&cache->rb_node, &nfsi->access_cache);
list_del(&cache->lru);
spin_unlock(&inode->i_lock);
nfs_access_free_entry(cache);
return -ENOENT;
@ -1728,7 +1745,8 @@ out_zap:
static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set)
{
struct rb_root *root_node = &NFS_I(inode)->access_cache;
struct nfs_inode *nfsi = NFS_I(inode);
struct rb_root *root_node = &nfsi->access_cache;
struct rb_node **p = &root_node->rb_node;
struct rb_node *parent = NULL;
struct nfs_access_entry *entry;
@ -1747,10 +1765,13 @@ static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *
}
rb_link_node(&set->rb_node, parent, p);
rb_insert_color(&set->rb_node, root_node);
list_add_tail(&set->lru, &nfsi->access_cache_entry_lru);
spin_unlock(&inode->i_lock);
return;
found:
rb_replace_node(parent, &set->rb_node, root_node);
list_add_tail(&set->lru, &nfsi->access_cache_entry_lru);
list_del(&entry->lru);
spin_unlock(&inode->i_lock);
nfs_access_free_entry(entry);
}
@ -1766,6 +1787,18 @@ void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set)
cache->mask = set->mask;
nfs_access_add_rbtree(inode, cache);
/* Update accounting */
smp_mb__before_atomic_inc();
atomic_long_inc(&nfs_access_nr_entries);
smp_mb__after_atomic_inc();
/* Add inode to global LRU list */
if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_FLAGS(inode))) {
spin_lock(&nfs_access_lru_lock);
list_add_tail(&NFS_I(inode)->access_cache_inode_lru, &nfs_access_lru_list);
spin_unlock(&nfs_access_lru_lock);
}
}
static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask)

2
fs/nfs/inode.c
View File

@ -1104,6 +1104,8 @@ static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
INIT_LIST_HEAD(&nfsi->dirty);
INIT_LIST_HEAD(&nfsi->commit);
INIT_LIST_HEAD(&nfsi->open_files);
INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
atomic_set(&nfsi->data_updates, 0);
nfsi->ndirty = 0;

4
include/linux/nfs_fs.h
View File

@ -71,6 +71,7 @@
*/
struct nfs_access_entry {
struct rb_node rb_node;
struct list_head lru;
unsigned long jiffies;
struct rpc_cred * cred;
int mask;
@ -148,6 +149,8 @@ struct nfs_inode {
atomic_t data_updates;
struct rb_root access_cache;
struct list_head access_cache_entry_lru;
struct list_head access_cache_inode_lru;
#ifdef CONFIG_NFS_V3_ACL
struct posix_acl *acl_access;
struct posix_acl *acl_default;
@ -201,6 +204,7 @@ struct nfs_inode {
#define NFS_INO_REVALIDATING (0) /* revalidating attrs */
#define NFS_INO_ADVISE_RDPLUS (1) /* advise readdirplus */
#define NFS_INO_STALE (2) /* possible stale inode */
#define NFS_INO_ACL_LRU_SET (3) /* Inode is on the LRU list */
static inline struct nfs_inode *NFS_I(struct inode *inode)
{