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NFSv4.1 move deviceid cache to filelayout driver

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No need for generic cache with only one user.
Keep a simple hash of deviceids in the filelayout driver.

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Acked-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Christoph Hellwig
2011-03-01 01:34:21 +00:00
committed by Trond Myklebust
parent cbdabc7f8b
commit ea8eecdd11
6 changed files with 92 additions and 264 deletions
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48
fs/nfs/pnfs.h
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@@ -68,8 +68,6 @@ struct pnfs_layoutdriver_type {
const u32 id;
const char *name;
struct module *owner;
int (*set_layoutdriver) (struct nfs_server *);
int (*clear_layoutdriver) (struct nfs_server *);
struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr);
void (*free_lseg) (struct pnfs_layout_segment *lseg);
@@ -106,52 +104,6 @@ struct pnfs_device {
unsigned int pglen;
};
/*
* Device ID RCU cache. A device ID is unique per client ID and layout type.
*/
#define NFS4_DEVICE_ID_HASH_BITS 5
#define NFS4_DEVICE_ID_HASH_SIZE (1 << NFS4_DEVICE_ID_HASH_BITS)
#define NFS4_DEVICE_ID_HASH_MASK (NFS4_DEVICE_ID_HASH_SIZE - 1)
static inline u32
nfs4_deviceid_hash(struct nfs4_deviceid *id)
{
unsigned char *cptr = (unsigned char *)id->data;
unsigned int nbytes = NFS4_DEVICEID4_SIZE;
u32 x = 0;
while (nbytes--) {
x *= 37;
x += *cptr++;
}
return x & NFS4_DEVICE_ID_HASH_MASK;
}
struct pnfs_deviceid_node {
struct hlist_node de_node;
struct nfs4_deviceid de_id;
atomic_t de_ref;
};
struct pnfs_deviceid_cache {
spinlock_t dc_lock;
atomic_t dc_ref;
void (*dc_free_callback)(struct pnfs_deviceid_node *);
struct hlist_head dc_deviceids[NFS4_DEVICE_ID_HASH_SIZE];
};
extern int pnfs_alloc_init_deviceid_cache(struct nfs_client *,
void (*free_callback)(struct pnfs_deviceid_node *));
extern void pnfs_put_deviceid_cache(struct nfs_client *);
extern struct pnfs_deviceid_node *pnfs_find_get_deviceid(
struct pnfs_deviceid_cache *,
struct nfs4_deviceid *);
extern struct pnfs_deviceid_node *pnfs_add_deviceid(
struct pnfs_deviceid_cache *,
struct pnfs_deviceid_node *);
extern void pnfs_put_deviceid(struct pnfs_deviceid_cache *c,
struct pnfs_deviceid_node *devid);
extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);