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NFSv4.1: make deviceid cache global

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Move deviceid cache from the pnfs files layout driver to the
generic layer in preparation for the objects layout driver.

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
This commit is contained in:
Benny Halevy 2011-05-19 22:14:47 -04:00 committed by Boaz Harrosh
parent 45df3c8b0f
commit a1eaecbc4c
6 changed files with 194 additions and 103 deletions
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2
fs/nfs/Makefile
View File

@ -15,7 +15,7 @@ nfs-$(CONFIG_NFS_V4) += nfs4proc.o nfs4xdr.o nfs4state.o nfs4renewd.o \
delegation.o idmap.o \
callback.o callback_xdr.o callback_proc.o \
nfs4namespace.o
nfs-$(CONFIG_NFS_V4_1) += pnfs.o
nfs-$(CONFIG_NFS_V4_1) += pnfs.o pnfs_dev.o
nfs-$(CONFIG_SYSCTL) += sysctl.o
nfs-$(CONFIG_NFS_FSCACHE) += fscache.o fscache-index.o

10
fs/nfs/nfs4filelayout.c
View File

@ -421,6 +421,7 @@ filelayout_check_layout(struct pnfs_layout_hdr *lo,
struct nfs4_deviceid *id,
gfp_t gfp_flags)
{
struct nfs4_deviceid_node *d;
struct nfs4_file_layout_dsaddr *dsaddr;
int status = -EINVAL;
struct nfs_server *nfss = NFS_SERVER(lo->plh_inode);
@ -440,12 +441,13 @@ filelayout_check_layout(struct pnfs_layout_hdr *lo,
}
/* find and reference the deviceid */
dsaddr = nfs4_fl_find_get_deviceid(NFS_SERVER(lo->plh_inode)->nfs_client, id);
if (dsaddr == NULL) {
d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode)->nfs_client, id);
if (d == NULL) {
dsaddr = get_device_info(lo->plh_inode, id, gfp_flags);
if (dsaddr == NULL)
goto out;
}
} else
dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
fl->dsaddr = dsaddr;
if (fl->first_stripe_index < 0 ||
@ -535,7 +537,7 @@ filelayout_decode_layout(struct pnfs_layout_hdr *flo,
memcpy(id, p, sizeof(*id));
p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
print_deviceid(id);
nfs4_print_deviceid(id);
nfl_util = be32_to_cpup(p++);
if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS)

8
fs/nfs/nfs4filelayout.h
View File

@ -59,10 +59,7 @@ struct nfs4_pnfs_ds {
#define NFS4_DEVICE_ID_NEG_ENTRY 0x00000001
struct nfs4_file_layout_dsaddr {
struct hlist_node node;
struct nfs_client *nfs_client;
struct nfs4_deviceid deviceid;
atomic_t ref;
struct nfs4_deviceid_node id_node;
unsigned long flags;
u32 stripe_count;
u8 *stripe_indices;
@ -96,13 +93,10 @@ extern struct nfs_fh *
nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j);
extern void print_ds(struct nfs4_pnfs_ds *ds);
extern void print_deviceid(struct nfs4_deviceid *dev_id);
u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset);
u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j);
struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg,
u32 ds_idx);
extern struct nfs4_file_layout_dsaddr *
nfs4_fl_find_get_deviceid(struct nfs_client *, struct nfs4_deviceid *dev_id);
extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
struct nfs4_file_layout_dsaddr *
get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id, gfp_t gfp_flags);

104
fs/nfs/nfs4filelayoutdev.c
View File

@ -36,30 +36,6 @@
#define NFSDBG_FACILITY NFSDBG_PNFS_LD
/*
* Device ID RCU cache. A device ID is unique per client ID and layout type.
*/
#define NFS4_FL_DEVICE_ID_HASH_BITS 5
#define NFS4_FL_DEVICE_ID_HASH_SIZE (1 << NFS4_FL_DEVICE_ID_HASH_BITS)
#define NFS4_FL_DEVICE_ID_HASH_MASK (NFS4_FL_DEVICE_ID_HASH_SIZE - 1)
static inline u32
nfs4_fl_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_FL_DEVICE_ID_HASH_MASK;
}
static struct hlist_head filelayout_deviceid_cache[NFS4_FL_DEVICE_ID_HASH_SIZE];
static DEFINE_SPINLOCK(filelayout_deviceid_lock);
/*
* Data server cache
*
@ -89,27 +65,6 @@ print_ds(struct nfs4_pnfs_ds *ds)
ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0);
}
void
print_ds_list(struct nfs4_file_layout_dsaddr *dsaddr)
{
int i;
ifdebug(FACILITY) {
printk("%s dsaddr->ds_num %d\n", __func__,
dsaddr->ds_num);
for (i = 0; i < dsaddr->ds_num; i++)
print_ds(dsaddr->ds_list[i]);
}
}
void print_deviceid(struct nfs4_deviceid *id)
{
u32 *p = (u32 *)id;
dprintk("%s: device id= [%x%x%x%x]\n", __func__,
p[0], p[1], p[2], p[3]);
}
/* nfs4_ds_cache_lock is held */
static struct nfs4_pnfs_ds *
_data_server_lookup_locked(u32 ip_addr, u32 port)
@ -207,7 +162,7 @@ nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
struct nfs4_pnfs_ds *ds;
int i;
print_deviceid(&dsaddr->deviceid);
nfs4_print_deviceid(&dsaddr->id_node.deviceid);
for (i = 0; i < dsaddr->ds_num; i++) {
ds = dsaddr->ds_list[i];
@ -431,8 +386,8 @@ decode_device(struct inode *ino, struct pnfs_device *pdev, gfp_t gfp_flags)
dsaddr->stripe_indices = stripe_indices;
stripe_indices = NULL;
dsaddr->ds_num = num;
dsaddr->nfs_client = NFS_SERVER(ino)->nfs_client;
memcpy(&dsaddr->deviceid, &pdev->dev_id, sizeof(pdev->dev_id));
nfs4_init_deviceid_node(&dsaddr->id_node, NFS_SERVER(ino)->nfs_client,
&pdev->dev_id);
for (i = 0; i < dsaddr->ds_num; i++) {
int j;
@ -505,8 +460,8 @@ out_err:
static struct nfs4_file_layout_dsaddr *
decode_and_add_device(struct inode *inode, struct pnfs_device *dev, gfp_t gfp_flags)
{
struct nfs4_file_layout_dsaddr *d, *new;
long hash;
struct nfs4_deviceid_node *d;
struct nfs4_file_layout_dsaddr *n, *new;
new = decode_device(inode, dev, gfp_flags);
if (!new) {
@ -515,20 +470,13 @@ decode_and_add_device(struct inode *inode, struct pnfs_device *dev, gfp_t gfp_fl
return NULL;
}
spin_lock(&filelayout_deviceid_lock);
d = nfs4_fl_find_get_deviceid(new->nfs_client, &new->deviceid);
if (d) {
spin_unlock(&filelayout_deviceid_lock);
d = nfs4_insert_deviceid_node(&new->id_node);
n = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
if (n != new) {
nfs4_fl_free_deviceid(new);
return d;
return n;
}
INIT_HLIST_NODE(&new->node);
atomic_set(&new->ref, 1);
hash = nfs4_fl_deviceid_hash(&new->deviceid);
hlist_add_head_rcu(&new->node, &filelayout_deviceid_cache[hash]);
spin_unlock(&filelayout_deviceid_lock);
return new;
}
@ -600,34 +548,8 @@ out_free:
void
nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
{
if (atomic_dec_and_lock(&dsaddr->ref, &filelayout_deviceid_lock)) {
hlist_del_rcu(&dsaddr->node);
spin_unlock(&filelayout_deviceid_lock);
synchronize_rcu();
if (nfs4_put_deviceid_node(&dsaddr->id_node))
nfs4_fl_free_deviceid(dsaddr);
}
}
struct nfs4_file_layout_dsaddr *
nfs4_fl_find_get_deviceid(struct nfs_client *clp, struct nfs4_deviceid *id)
{
struct nfs4_file_layout_dsaddr *d;
struct hlist_node *n;
long hash = nfs4_fl_deviceid_hash(id);
rcu_read_lock();
hlist_for_each_entry_rcu(d, n, &filelayout_deviceid_cache[hash], node) {
if (d->nfs_client == clp && !memcmp(&d->deviceid, id, sizeof(*id))) {
if (!atomic_inc_not_zero(&d->ref))
goto fail;
rcu_read_unlock();
return d;
}
}
fail:
rcu_read_unlock();
return NULL;
}
/*
@ -675,15 +597,15 @@ static void
filelayout_mark_devid_negative(struct nfs4_file_layout_dsaddr *dsaddr,
int err, u32 ds_addr)
{
u32 *p = (u32 *)&dsaddr->deviceid;
u32 *p = (u32 *)&dsaddr->id_node.deviceid;
printk(KERN_ERR "NFS: data server %x connection error %d."
" Deviceid [%x%x%x%x] marked out of use.\n",
ds_addr, err, p[0], p[1], p[2], p[3]);
spin_lock(&filelayout_deviceid_lock);
spin_lock(&nfs4_ds_cache_lock);
dsaddr->flags |= NFS4_DEVICE_ID_NEG_ENTRY;
spin_unlock(&filelayout_deviceid_lock);
spin_unlock(&nfs4_ds_cache_lock);
}
struct nfs4_pnfs_ds *

17
fs/nfs/pnfs.h
View File

@ -157,6 +157,23 @@ bool pnfs_roc_drain(struct inode *ino, u32 *barrier);
void pnfs_set_layoutcommit(struct nfs_write_data *wdata);
int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
/* pnfs_dev.c */
struct nfs4_deviceid_node {
struct hlist_node node;
const struct nfs_client *nfs_client;
struct nfs4_deviceid deviceid;
atomic_t ref;
};
void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct nfs_client *, const struct nfs4_deviceid *);
struct nfs4_deviceid_node *nfs4_unhash_put_deviceid(const struct nfs_client *, const struct nfs4_deviceid *);
void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
const struct nfs_client *,
const struct nfs4_deviceid *);
struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *);
bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
static inline int lo_fail_bit(u32 iomode)
{
return iomode == IOMODE_RW ?

156
fs/nfs/pnfs_dev.c Normal file
View File

@ -0,0 +1,156 @@
/*
* Device operations for the pnfs client.
*
* Copyright (c) 2002
* The Regents of the University of Michigan
* All Rights Reserved
*
* Dean Hildebrand <dhildebz@umich.edu>
* Garth Goodson <Garth.Goodson@netapp.com>
*
* Permission is granted to use, copy, create derivative works, and
* redistribute this software and such derivative works for any purpose,
* so long as the name of the University of Michigan is not used in
* any advertising or publicity pertaining to the use or distribution
* of this software without specific, written prior authorization. If
* the above copyright notice or any other identification of the
* University of Michigan is included in any copy of any portion of
* this software, then the disclaimer below must also be included.
*
* This software is provided as is, without representation or warranty
* of any kind either express or implied, including without limitation
* the implied warranties of merchantability, fitness for a particular
* purpose, or noninfringement. The Regents of the University of
* Michigan shall not be liable for any damages, including special,
* indirect, incidental, or consequential damages, with respect to any
* claim arising out of or in connection with the use of the software,
* even if it has been or is hereafter advised of the possibility of
* such damages.
*/
#include "pnfs.h"
#define NFSDBG_FACILITY NFSDBG_PNFS
/*
* Device ID RCU cache. A device ID is unique per server 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 struct hlist_head nfs4_deviceid_cache[NFS4_DEVICE_ID_HASH_SIZE];
static DEFINE_SPINLOCK(nfs4_deviceid_lock);
void
nfs4_print_deviceid(const struct nfs4_deviceid *id)
{
u32 *p = (u32 *)id;
dprintk("%s: device id= [%x%x%x%x]\n", __func__,
p[0], p[1], p[2], p[3]);
}
EXPORT_SYMBOL_GPL(nfs4_print_deviceid);
static inline u32
nfs4_deviceid_hash(const 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;
}
/*
* Lookup a deviceid in cache and get a reference count on it if found
*
* @clp nfs_client associated with deviceid
* @id deviceid to look up
*/
struct nfs4_deviceid_node *
nfs4_find_get_deviceid(const struct nfs_client *clp, const struct nfs4_deviceid *id)
{
struct nfs4_deviceid_node *d;
struct hlist_node *n;
long hash = nfs4_deviceid_hash(id);
rcu_read_lock();
hlist_for_each_entry_rcu(d, n, &nfs4_deviceid_cache[hash], node) {
if (d->nfs_client == clp && !memcmp(&d->deviceid, id, sizeof(*id))) {
if (!atomic_inc_not_zero(&d->ref))
goto fail;
rcu_read_unlock();
return d;
}
}
fail:
rcu_read_unlock();
return NULL;
}
EXPORT_SYMBOL_GPL(nfs4_find_get_deviceid);
void
nfs4_init_deviceid_node(struct nfs4_deviceid_node *d,
const struct nfs_client *nfs_client,
const struct nfs4_deviceid *id)
{
d->nfs_client = nfs_client;
d->deviceid = *id;
}
EXPORT_SYMBOL_GPL(nfs4_init_deviceid_node);
/*
* Uniquely initialize and insert a deviceid node into cache
*
* @new new deviceid node
* Note that the caller must set up new->nfs_client and new->deviceid
*
* @ret the inserted node, if none found, otherwise, the found entry.
*/
struct nfs4_deviceid_node *
nfs4_insert_deviceid_node(struct nfs4_deviceid_node *new)
{
struct nfs4_deviceid_node *d;
long hash;
spin_lock(&nfs4_deviceid_lock);
d = nfs4_find_get_deviceid(new->nfs_client, &new->deviceid);
if (d) {
spin_unlock(&nfs4_deviceid_lock);
return d;
}
INIT_HLIST_NODE(&new->node);
atomic_set(&new->ref, 1);
hash = nfs4_deviceid_hash(&new->deviceid);
hlist_add_head_rcu(&new->node, &nfs4_deviceid_cache[hash]);
spin_unlock(&nfs4_deviceid_lock);
return new;
}
EXPORT_SYMBOL_GPL(nfs4_insert_deviceid_node);
/*
* Dereference a deviceid node and delete it when its reference count drops
* to zero.
*
* @d deviceid node to put
*
* @ret true iff the node was deleted
*/
bool
nfs4_put_deviceid_node(struct nfs4_deviceid_node *d)
{
if (!atomic_dec_and_lock(&d->ref, &nfs4_deviceid_lock))
return false;
hlist_del_init_rcu(&d->node);
spin_unlock(&nfs4_deviceid_lock);
synchronize_rcu();
return true;
}
EXPORT_SYMBOL_GPL(nfs4_put_deviceid_node);