On Feb 15, 2011, at 11:37 AM, William A. (Andy) Adamson wrote:
> On Tue, Feb 15, 2011 at 11:02 AM, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
>> FYI that whole device layout cache thingy looks like a complete fucking
>> mess to me.
>>
>> It's nothing but a trivial hash lookup which is only used in the file
>> layout driver. But instead of just having a hash allocated in the file
>> layout driver on module load, and a trivial opencoded lookup for it it's
>> a massively overcomplicated set of routines. Please rip this stuff out
>> before doing further work in this area.
>>
>> The patch below removes the maze of pointless abstractions and just
>> keeps a simple hash of deviceids in the filelayout driver.
>
>
> The abstract layer is so that this code is not replicated per layout
> driver. Object and block drivers need to do the same task, and indeed
> use this code in their prototypes.
> That said, we don't have those other layout drivers in kernel, so
> moving it all to the file layout driver is fine with me, so long as we
> don't have to move it back once we get other drivers.
>
> Trond?
>
> -->Andy
OK. We all agree. Move the deviceid cache to the filelayout driver until there is a need for a common cache.
-->Andy
>
>>
>>
>> Index: linux-2.6/fs/nfs/nfs4filelayout.c
>> ===================================================================
>> --- linux-2.6.orig/fs/nfs/nfs4filelayout.c 2011-02-15 16:10:51.108421283 +0100
>> +++ linux-2.6/fs/nfs/nfs4filelayout.c 2011-02-15 16:55:22.087422176 +0100
>> @@ -40,32 +40,6 @@ MODULE_LICENSE("GPL");
>> MODULE_AUTHOR("Dean Hildebrand <dhildebz@xxxxxxxxx>");
>> MODULE_DESCRIPTION("The NFSv4 file layout driver");
>>
>> -static int
>> -filelayout_set_layoutdriver(struct nfs_server *nfss)
>> -{
>> - int status = pnfs_alloc_init_deviceid_cache(nfss->nfs_client,
>> - nfs4_fl_free_deviceid_callback);
>> - if (status) {
>> - printk(KERN_WARNING "%s: deviceid cache could not be "
>> - "initialized\n", __func__);
>> - return status;
>> - }
>> - dprintk("%s: deviceid cache has been initialized successfully\n",
>> - __func__);
>> - return 0;
>> -}
>> -
>> -/* Clear out the layout by destroying its device list */
>> -static int
>> -filelayout_clear_layoutdriver(struct nfs_server *nfss)
>> -{
>> - dprintk("--> %s\n", __func__);
>> -
>> - if (nfss->nfs_client->cl_devid_cache)
>> - pnfs_put_deviceid_cache(nfss->nfs_client);
>> - return 0;
>> -}
>> -
>> /*
>> * filelayout_check_layout()
>> *
>> @@ -99,7 +73,7 @@ filelayout_check_layout(struct pnfs_layo
>> }
>>
>> /* find and reference the deviceid */
>> - dsaddr = nfs4_fl_find_get_deviceid(nfss->nfs_client, id);
>> + dsaddr = nfs4_fl_find_get_deviceid(id);
>> if (dsaddr == NULL) {
>> dsaddr = get_device_info(lo->plh_inode, id);
>> if (dsaddr == NULL)
>> @@ -134,7 +108,7 @@ out:
>> dprintk("--> %s returns %d\n", __func__, status);
>> return status;
>> out_put:
>> - pnfs_put_deviceid(nfss->nfs_client->cl_devid_cache, &dsaddr->deviceid);
>> + nfs4_fl_put_deviceid(dsaddr);
>> goto out;
>> }
>>
>> @@ -243,23 +217,19 @@ filelayout_alloc_lseg(struct pnfs_layout
>> static void
>> filelayout_free_lseg(struct pnfs_layout_segment *lseg)
>> {
>> - struct nfs_server *nfss = NFS_SERVER(lseg->pls_layout->plh_inode);
>> struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
>>
>> dprintk("--> %s\n", __func__);
>> - pnfs_put_deviceid(nfss->nfs_client->cl_devid_cache,
>> - &fl->dsaddr->deviceid);
>> + nfs4_fl_put_deviceid(fl->dsaddr);
>> _filelayout_free_lseg(fl);
>> }
>>
>> static struct pnfs_layoutdriver_type filelayout_type = {
>> - .id = LAYOUT_NFSV4_1_FILES,
>> - .name = "LAYOUT_NFSV4_1_FILES",
>> - .owner = THIS_MODULE,
>> - .set_layoutdriver = filelayout_set_layoutdriver,
>> - .clear_layoutdriver = filelayout_clear_layoutdriver,
>> - .alloc_lseg = filelayout_alloc_lseg,
>> - .free_lseg = filelayout_free_lseg,
>> + .id = LAYOUT_NFSV4_1_FILES,
>> + .name = "LAYOUT_NFSV4_1_FILES",
>> + .owner = THIS_MODULE,
>> + .alloc_lseg = filelayout_alloc_lseg,
>> + .free_lseg = filelayout_free_lseg,
>> };
>>
>> static int __init nfs4filelayout_init(void)
>> Index: linux-2.6/fs/nfs/nfs4filelayout.h
>> ===================================================================
>> --- linux-2.6.orig/fs/nfs/nfs4filelayout.h 2011-02-15 16:30:25.270920897 +0100
>> +++ linux-2.6/fs/nfs/nfs4filelayout.h 2011-02-15 16:47:50.063445740 +0100
>> @@ -56,7 +56,9 @@ struct nfs4_pnfs_ds {
>> };
>>
>> struct nfs4_file_layout_dsaddr {
>> - struct pnfs_deviceid_node deviceid;
>> + struct hlist_node node;
>> + struct nfs4_deviceid deviceid;
>> + atomic_t ref;
>> u32 stripe_count;
>> u8 *stripe_indices;
>> u32 ds_num;
>> @@ -83,11 +85,11 @@ FILELAYOUT_LSEG(struct pnfs_layout_segme
>> generic_hdr);
>> }
>>
>> -extern void nfs4_fl_free_deviceid_callback(struct pnfs_deviceid_node *);
>> extern void print_ds(struct nfs4_pnfs_ds *ds);
>> extern void print_deviceid(struct nfs4_deviceid *dev_id);
>> extern struct nfs4_file_layout_dsaddr *
>> -nfs4_fl_find_get_deviceid(struct nfs_client *, struct nfs4_deviceid *dev_id);
>> +nfs4_fl_find_get_deviceid(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);
>>
>> Index: linux-2.6/fs/nfs/nfs4filelayoutdev.c
>> ===================================================================
>> --- linux-2.6.orig/fs/nfs/nfs4filelayoutdev.c 2011-02-15 16:23:03.480487362 +0100
>> +++ linux-2.6/fs/nfs/nfs4filelayoutdev.c 2011-02-15 16:55:02.894924739 +0100
>> @@ -37,6 +37,30 @@
>> #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
>> *
>> * Data servers can be mapped to different device ids.
>> @@ -122,7 +146,7 @@ nfs4_fl_free_deviceid(struct nfs4_file_l
>> struct nfs4_pnfs_ds *ds;
>> int i;
>>
>> - print_deviceid(&dsaddr->deviceid.de_id);
>> + print_deviceid(&dsaddr->deviceid);
>>
>> for (i = 0; i < dsaddr->ds_num; i++) {
>> ds = dsaddr->ds_list[i];
>> @@ -139,15 +163,6 @@ nfs4_fl_free_deviceid(struct nfs4_file_l
>> kfree(dsaddr);
>> }
>>
>> -void
>> -nfs4_fl_free_deviceid_callback(struct pnfs_deviceid_node *device)
>> -{
>> - struct nfs4_file_layout_dsaddr *dsaddr =
>> - container_of(device, struct nfs4_file_layout_dsaddr, deviceid);
>> -
>> - nfs4_fl_free_deviceid(dsaddr);
>> -}
>> -
>> static struct nfs4_pnfs_ds *
>> nfs4_pnfs_ds_add(struct inode *inode, u32 ip_addr, u32 port)
>> {
>> @@ -296,7 +311,7 @@ decode_device(struct inode *ino, struct
>> dsaddr->stripe_count = cnt;
>> dsaddr->ds_num = num;
>>
>> - memcpy(&dsaddr->deviceid.de_id, &pdev->dev_id, sizeof(pdev->dev_id));
>> + memcpy(&dsaddr->deviceid, &pdev->dev_id, sizeof(pdev->dev_id));
>>
>> /* Go back an read stripe indices */
>> p = indicesp;
>> @@ -346,28 +361,37 @@ out_err:
>> }
>>
>> /*
>> - * Decode the opaque device specified in 'dev'
>> - * and add it to the list of available devices.
>> - * If the deviceid is already cached, nfs4_add_deviceid will return
>> - * a pointer to the cached struct and throw away the new.
>> + * Decode the opaque device specified in 'dev' and add it to the cache of
>> + * available devices.
>> */
>> -static struct nfs4_file_layout_dsaddr*
>> +static struct nfs4_file_layout_dsaddr *
>> decode_and_add_device(struct inode *inode, struct pnfs_device *dev)
>> {
>> - struct nfs4_file_layout_dsaddr *dsaddr;
>> - struct pnfs_deviceid_node *d;
>> + struct nfs4_file_layout_dsaddr *d, *new;
>> + long hash;
>>
>> - dsaddr = decode_device(inode, dev);
>> - if (!dsaddr) {
>> + new = decode_device(inode, dev);
>> + if (!new) {
>> printk(KERN_WARNING "%s: Could not decode or add device\n",
>> __func__);
>> return NULL;
>> }
>>
>> - d = pnfs_add_deviceid(NFS_SERVER(inode)->nfs_client->cl_devid_cache,
>> - &dsaddr->deviceid);
>> + spin_lock(&filelayout_deviceid_lock);
>> + d = nfs4_fl_find_get_deviceid(&new->deviceid);
>> + if (d) {
>> + spin_unlock(&filelayout_deviceid_lock);
>> + nfs4_fl_free_deviceid(new);
>> + return d;
>> + }
>> +
>> + 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 container_of(d, struct nfs4_file_layout_dsaddr, deviceid);
>> + return new;
>> }
>>
>> /*
>> @@ -442,12 +466,36 @@ out_free:
>> return dsaddr;
>> }
>>
>> +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();
>> + nfs4_fl_free_deviceid(dsaddr);
>> + }
>> +}
>> +
>> struct nfs4_file_layout_dsaddr *
>> -nfs4_fl_find_get_deviceid(struct nfs_client *clp, struct nfs4_deviceid *id)
>> +nfs4_fl_find_get_deviceid(struct nfs4_deviceid *id)
>> {
>> - struct pnfs_deviceid_node *d;
>> + struct nfs4_file_layout_dsaddr *d;
>> + struct hlist_node *n;
>> + long hash = nfs4_fl_deviceid_hash(id);
>> +
>>
>> - d = pnfs_find_get_deviceid(clp->cl_devid_cache, id);
>> - return (d == NULL) ? NULL :
>> - container_of(d, struct nfs4_file_layout_dsaddr, deviceid);
>> + rcu_read_lock();
>> + hlist_for_each_entry_rcu(d, n, &filelayout_deviceid_cache[hash], node) {
>> + if (!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;
>> }
>> Index: linux-2.6/fs/nfs/pnfs.c
>> ===================================================================
>> --- linux-2.6.orig/fs/nfs/pnfs.c 2011-02-15 16:10:33.284421051 +0100
>> +++ linux-2.6/fs/nfs/pnfs.c 2011-02-15 16:21:47.115422052 +0100
>> @@ -74,10 +74,8 @@ find_pnfs_driver(u32 id)
>> void
>> unset_pnfs_layoutdriver(struct nfs_server *nfss)
>> {
>> - if (nfss->pnfs_curr_ld) {
>> - nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
>> + if (nfss->pnfs_curr_ld)
>> module_put(nfss->pnfs_curr_ld->owner);
>> - }
>> nfss->pnfs_curr_ld = NULL;
>> }
>>
>> @@ -115,13 +113,7 @@ set_pnfs_layoutdriver(struct nfs_server
>> goto out_no_driver;
>> }
>> server->pnfs_curr_ld = ld_type;
>> - if (ld_type->set_layoutdriver(server)) {
>> - printk(KERN_ERR
>> - "%s: Error initializing mount point for layout driver %u.\n",
>> - __func__, id);
>> - module_put(ld_type->owner);
>> - goto out_no_driver;
>> - }
>> +
>> dprintk("%s: pNFS module for %u set\n", __func__, id);
>> return;
>>
>> @@ -828,138 +820,3 @@ out_forget_reply:
>> NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg);
>> goto out;
>> }
>> -
>> -/*
>> - * Device ID cache. Currently supports one layout type per struct nfs_client.
>> - * Add layout type to the lookup key to expand to support multiple types.
>> - */
>> -int
>> -pnfs_alloc_init_deviceid_cache(struct nfs_client *clp,
>> - void (*free_callback)(struct pnfs_deviceid_node *))
>> -{
>> - struct pnfs_deviceid_cache *c;
>> -
>> - c = kzalloc(sizeof(struct pnfs_deviceid_cache), GFP_KERNEL);
>> - if (!c)
>> - return -ENOMEM;
>> - spin_lock(&clp->cl_lock);
>> - if (clp->cl_devid_cache != NULL) {
>> - atomic_inc(&clp->cl_devid_cache->dc_ref);
>> - dprintk("%s [kref [%d]]\n", __func__,
>> - atomic_read(&clp->cl_devid_cache->dc_ref));
>> - kfree(c);
>> - } else {
>> - /* kzalloc initializes hlists */
>> - spin_lock_init(&c->dc_lock);
>> - atomic_set(&c->dc_ref, 1);
>> - c->dc_free_callback = free_callback;
>> - clp->cl_devid_cache = c;
>> - dprintk("%s [new]\n", __func__);
>> - }
>> - spin_unlock(&clp->cl_lock);
>> - return 0;
>> -}
>> -EXPORT_SYMBOL_GPL(pnfs_alloc_init_deviceid_cache);
>> -
>> -/*
>> - * Called from pnfs_layoutdriver_type->free_lseg
>> - * last layout segment reference frees deviceid
>> - */
>> -void
>> -pnfs_put_deviceid(struct pnfs_deviceid_cache *c,
>> - struct pnfs_deviceid_node *devid)
>> -{
>> - struct nfs4_deviceid *id = &devid->de_id;
>> - struct pnfs_deviceid_node *d;
>> - struct hlist_node *n;
>> - long h = nfs4_deviceid_hash(id);
>> -
>> - dprintk("%s [%d]\n", __func__, atomic_read(&devid->de_ref));
>> - if (!atomic_dec_and_lock(&devid->de_ref, &c->dc_lock))
>> - return;
>> -
>> - hlist_for_each_entry_rcu(d, n, &c->dc_deviceids[h], de_node)
>> - if (!memcmp(&d->de_id, id, sizeof(*id))) {
>> - hlist_del_rcu(&d->de_node);
>> - spin_unlock(&c->dc_lock);
>> - synchronize_rcu();
>> - c->dc_free_callback(devid);
>> - return;
>> - }
>> - spin_unlock(&c->dc_lock);
>> - /* Why wasn't it found in the list? */
>> - BUG();
>> -}
>> -EXPORT_SYMBOL_GPL(pnfs_put_deviceid);
>> -
>> -/* Find and reference a deviceid */
>> -struct pnfs_deviceid_node *
>> -pnfs_find_get_deviceid(struct pnfs_deviceid_cache *c, struct nfs4_deviceid *id)
>> -{
>> - struct pnfs_deviceid_node *d;
>> - struct hlist_node *n;
>> - long hash = nfs4_deviceid_hash(id);
>> -
>> - dprintk("--> %s hash %ld\n", __func__, hash);
>> - rcu_read_lock();
>> - hlist_for_each_entry_rcu(d, n, &c->dc_deviceids[hash], de_node) {
>> - if (!memcmp(&d->de_id, id, sizeof(*id))) {
>> - if (!atomic_inc_not_zero(&d->de_ref)) {
>> - goto fail;
>> - } else {
>> - rcu_read_unlock();
>> - return d;
>> - }
>> - }
>> - }
>> -fail:
>> - rcu_read_unlock();
>> - return NULL;
>> -}
>> -EXPORT_SYMBOL_GPL(pnfs_find_get_deviceid);
>> -
>> -/*
>> - * Add a deviceid to the cache.
>> - * GETDEVICEINFOs for same deviceid can race. If deviceid is found, discard new
>> - */
>> -struct pnfs_deviceid_node *
>> -pnfs_add_deviceid(struct pnfs_deviceid_cache *c, struct pnfs_deviceid_node *new)
>> -{
>> - struct pnfs_deviceid_node *d;
>> - long hash = nfs4_deviceid_hash(&new->de_id);
>> -
>> - dprintk("--> %s hash %ld\n", __func__, hash);
>> - spin_lock(&c->dc_lock);
>> - d = pnfs_find_get_deviceid(c, &new->de_id);
>> - if (d) {
>> - spin_unlock(&c->dc_lock);
>> - dprintk("%s [discard]\n", __func__);
>> - c->dc_free_callback(new);
>> - return d;
>> - }
>> - INIT_HLIST_NODE(&new->de_node);
>> - atomic_set(&new->de_ref, 1);
>> - hlist_add_head_rcu(&new->de_node, &c->dc_deviceids[hash]);
>> - spin_unlock(&c->dc_lock);
>> - dprintk("%s [new]\n", __func__);
>> - return new;
>> -}
>> -EXPORT_SYMBOL_GPL(pnfs_add_deviceid);
>> -
>> -void
>> -pnfs_put_deviceid_cache(struct nfs_client *clp)
>> -{
>> - struct pnfs_deviceid_cache *local = clp->cl_devid_cache;
>> -
>> - dprintk("--> %s ({%d})\n", __func__, atomic_read(&local->dc_ref));
>> - if (atomic_dec_and_lock(&local->dc_ref, &clp->cl_lock)) {
>> - int i;
>> - /* Verify cache is empty */
>> - for (i = 0; i < NFS4_DEVICE_ID_HASH_SIZE; i++)
>> - BUG_ON(!hlist_empty(&local->dc_deviceids[i]));
>> - clp->cl_devid_cache = NULL;
>> - spin_unlock(&clp->cl_lock);
>> - kfree(local);
>> - }
>> -}
>> -EXPORT_SYMBOL_GPL(pnfs_put_deviceid_cache);
>> Index: linux-2.6/fs/nfs/pnfs.h
>> ===================================================================
>> --- linux-2.6.orig/fs/nfs/pnfs.h 2011-02-15 16:10:51.088421060 +0100
>> +++ linux-2.6/fs/nfs/pnfs.h 2011-02-15 16:21:34.995159583 +0100
>> @@ -61,8 +61,6 @@ 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);
>> };
>> @@ -90,52 +88,6 @@ 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 *);
>>
>> Index: linux-2.6/include/linux/nfs_fs_sb.h
>> ===================================================================
>> --- linux-2.6.orig/include/linux/nfs_fs_sb.h 2011-02-15 16:16:45.976420895 +0100
>> +++ linux-2.6/include/linux/nfs_fs_sb.h 2011-02-15 16:16:50.347380534 +0100
>> @@ -79,7 +79,6 @@ struct nfs_client {
>> u32 cl_exchange_flags;
>> struct nfs4_session *cl_session; /* sharred session */
>> struct list_head cl_layouts;
>> - struct pnfs_deviceid_cache *cl_devid_cache; /* pNFS deviceid cache */
>> #endif /* CONFIG_NFS_V4_1 */
>>
>> #ifdef CONFIG_NFS_FSCACHE
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
>> the body of a message to majordomo@xxxxxxxxxxxxxxx
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
