pnfs: factor GETDEVICEINFO implementations

Add support to the common pNFS core to issue GETDEVICEINFO calls on
a device ID cache miss.  The code is taken from the well debugged
file layout implementation and calls out to the layoutdriver through
a new alloc_deviceid_node method.  The calling conventions for
nfs4_find_get_deviceid are changed so that all information needed to
send a GETDEVICEINFO request is passed to the common code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Christoph Hellwig 2014-09-02 21:27:57 -07:00 committed by Trond Myklebust
parent 848746bd24
commit 661373b13d
8 changed files with 182 additions and 312 deletions

View File

@ -649,18 +649,15 @@ filelayout_check_layout(struct pnfs_layout_hdr *lo,
}
/* find and reference the deviceid */
d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode)->pnfs_curr_ld,
NFS_SERVER(lo->plh_inode)->nfs_client, id);
if (d == NULL) {
dsaddr = filelayout_get_device_info(lo->plh_inode, id,
lo->plh_lc_cred, gfp_flags);
if (dsaddr == NULL)
goto out;
} else
dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
d = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode), id,
lo->plh_lc_cred, gfp_flags);
if (d == NULL)
goto out;
dsaddr = container_of(d, struct nfs4_file_layout_dsaddr, id_node);
/* Found deviceid is unavailable */
if (filelayout_test_devid_unavailable(&dsaddr->id_node))
goto out_put;
goto out_put;
fl->dsaddr = dsaddr;
@ -1371,6 +1368,17 @@ out:
cinfo->ds->ncommitting = 0;
return PNFS_ATTEMPTED;
}
static struct nfs4_deviceid_node *
filelayout_alloc_deviceid_node(struct nfs_server *server,
struct pnfs_device *pdev, gfp_t gfp_flags)
{
struct nfs4_file_layout_dsaddr *dsaddr;
dsaddr = nfs4_fl_alloc_deviceid_node(server, pdev, gfp_flags);
if (!dsaddr)
return NULL;
return &dsaddr->id_node;
}
static void
filelayout_free_deveiceid_node(struct nfs4_deviceid_node *d)
@ -1423,6 +1431,7 @@ static struct pnfs_layoutdriver_type filelayout_type = {
.commit_pagelist = filelayout_commit_pagelist,
.read_pagelist = filelayout_read_pagelist,
.write_pagelist = filelayout_write_pagelist,
.alloc_deviceid_node = filelayout_alloc_deviceid_node,
.free_deviceid_node = filelayout_free_deveiceid_node,
};

View File

@ -147,10 +147,11 @@ 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_alloc_deviceid_node(struct nfs_server *server,
struct pnfs_device *pdev, gfp_t gfp_flags);
extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
extern void nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
struct nfs4_file_layout_dsaddr *
filelayout_get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id,
struct rpc_cred *cred, gfp_t gfp_flags);
#endif /* FS_NFS_NFS4FILELAYOUT_H */

View File

@ -484,8 +484,9 @@ out_err:
}
/* Decode opaque device data and return the result */
static struct nfs4_file_layout_dsaddr*
decode_device(struct inode *ino, struct pnfs_device *pdev, gfp_t gfp_flags)
struct nfs4_file_layout_dsaddr *
nfs4_fl_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
gfp_t gfp_flags)
{
int i;
u32 cnt, num;
@ -570,10 +571,7 @@ 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;
nfs4_init_deviceid_node(&dsaddr->id_node,
NFS_SERVER(ino)->pnfs_curr_ld,
NFS_SERVER(ino)->nfs_client,
&pdev->dev_id);
nfs4_init_deviceid_node(&dsaddr->id_node, server, &pdev->dev_id);
INIT_LIST_HEAD(&dsaddrs);
@ -587,7 +585,7 @@ decode_device(struct inode *ino, struct pnfs_device *pdev, gfp_t gfp_flags)
mp_count = be32_to_cpup(p); /* multipath count */
for (j = 0; j < mp_count; j++) {
da = decode_ds_addr(NFS_SERVER(ino)->nfs_client->cl_net,
da = decode_ds_addr(server->nfs_client->cl_net,
&stream, gfp_flags);
if (da)
list_add_tail(&da->da_node, &dsaddrs);
@ -637,102 +635,6 @@ out_err:
return NULL;
}
/*
* Decode the opaque device specified in 'dev' and add it to the cache of
* available devices.
*/
static struct nfs4_file_layout_dsaddr *
decode_and_add_device(struct inode *inode, struct pnfs_device *dev, gfp_t gfp_flags)
{
struct nfs4_deviceid_node *d;
struct nfs4_file_layout_dsaddr *n, *new;
new = decode_device(inode, dev, gfp_flags);
if (!new) {
printk(KERN_WARNING "NFS: %s: Could not decode or add device\n",
__func__);
return NULL;
}
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 n;
}
return new;
}
/*
* Retrieve the information for dev_id, add it to the list
* of available devices, and return it.
*/
struct nfs4_file_layout_dsaddr *
filelayout_get_device_info(struct inode *inode,
struct nfs4_deviceid *dev_id,
struct rpc_cred *cred,
gfp_t gfp_flags)
{
struct pnfs_device *pdev = NULL;
u32 max_resp_sz;
int max_pages;
struct page **pages = NULL;
struct nfs4_file_layout_dsaddr *dsaddr = NULL;
int rc, i;
struct nfs_server *server = NFS_SERVER(inode);
/*
* Use the session max response size as the basis for setting
* GETDEVICEINFO's maxcount
*/
max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
max_pages = nfs_page_array_len(0, max_resp_sz);
dprintk("%s inode %p max_resp_sz %u max_pages %d\n",
__func__, inode, max_resp_sz, max_pages);
pdev = kzalloc(sizeof(struct pnfs_device), gfp_flags);
if (pdev == NULL)
return NULL;
pages = kcalloc(max_pages, sizeof(struct page *), gfp_flags);
if (pages == NULL) {
kfree(pdev);
return NULL;
}
for (i = 0; i < max_pages; i++) {
pages[i] = alloc_page(gfp_flags);
if (!pages[i])
goto out_free;
}
memcpy(&pdev->dev_id, dev_id, sizeof(*dev_id));
pdev->layout_type = LAYOUT_NFSV4_1_FILES;
pdev->pages = pages;
pdev->pgbase = 0;
pdev->pglen = max_resp_sz;
pdev->mincount = 0;
pdev->maxcount = max_resp_sz - nfs41_maxgetdevinfo_overhead;
rc = nfs4_proc_getdeviceinfo(server, pdev, cred);
dprintk("%s getdevice info returns %d\n", __func__, rc);
if (rc)
goto out_free;
/*
* Found new device, need to decode it and then add it to the
* list of known devices for this mountpoint.
*/
dsaddr = decode_and_add_device(inode, pdev, gfp_flags);
out_free:
for (i = 0; i < max_pages; i++)
__free_page(pages[i]);
kfree(pages);
kfree(pdev);
dprintk("<-- %s dsaddr %p\n", __func__, dsaddr);
return dsaddr;
}
void
nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
{

View File

@ -60,52 +60,6 @@ objio_free_deviceid_node(struct nfs4_deviceid_node *d)
kfree(de);
}
static struct objio_dev_ent *_dev_list_find(const struct nfs_server *nfss,
const struct nfs4_deviceid *d_id)
{
struct nfs4_deviceid_node *d;
struct objio_dev_ent *de;
d = nfs4_find_get_deviceid(nfss->pnfs_curr_ld, nfss->nfs_client, d_id);
if (!d)
return NULL;
de = container_of(d, struct objio_dev_ent, id_node);
return de;
}
static struct objio_dev_ent *
_dev_list_add(const struct nfs_server *nfss,
const struct nfs4_deviceid *d_id, struct osd_dev *od,
gfp_t gfp_flags)
{
struct nfs4_deviceid_node *d;
struct objio_dev_ent *de = kzalloc(sizeof(*de), gfp_flags);
struct objio_dev_ent *n;
if (!de) {
dprintk("%s: -ENOMEM od=%p\n", __func__, od);
return NULL;
}
dprintk("%s: Adding od=%p\n", __func__, od);
nfs4_init_deviceid_node(&de->id_node,
nfss->pnfs_curr_ld,
nfss->nfs_client,
d_id);
de->od.od = od;
d = nfs4_insert_deviceid_node(&de->id_node);
n = container_of(d, struct objio_dev_ent, id_node);
if (n != de) {
dprintk("%s: Race with other n->od=%p\n", __func__, n->od.od);
objio_free_deviceid_node(&de->id_node);
de = n;
}
return de;
}
struct objio_segment {
struct pnfs_layout_segment lseg;
@ -130,29 +84,24 @@ struct objio_state {
/* Send and wait for a get_device_info of devices in the layout,
then look them up with the osd_initiator library */
static int objio_devices_lookup(struct pnfs_layout_hdr *pnfslay,
struct objio_segment *objio_seg, unsigned c, struct nfs4_deviceid *d_id,
gfp_t gfp_flags)
struct nfs4_deviceid_node *
objio_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
gfp_t gfp_flags)
{
struct pnfs_osd_deviceaddr *deviceaddr;
struct objio_dev_ent *ode;
struct objio_dev_ent *ode = NULL;
struct osd_dev *od;
struct osd_dev_info odi;
bool retry_flag = true;
u32 *p;
int err;
ode = _dev_list_find(NFS_SERVER(pnfslay->plh_inode), d_id);
if (ode) {
objio_seg->oc.ods[c] = &ode->od; /* must use container_of */
return 0;
}
deviceaddr = kzalloc(sizeof(*deviceaddr), gfp_flags);
if (!deviceaddr)
return NULL;
err = objlayout_get_deviceinfo(pnfslay, d_id, &deviceaddr, gfp_flags);
if (unlikely(err)) {
dprintk("%s: objlayout_get_deviceinfo dev(%llx:%llx) =>%d\n",
__func__, _DEVID_LO(d_id), _DEVID_HI(d_id), err);
return err;
}
p = page_address(pdev->pages[0]);
pnfs_osd_xdr_decode_deviceaddr(deviceaddr, p);
odi.systemid_len = deviceaddr->oda_systemid.len;
if (odi.systemid_len > sizeof(odi.systemid)) {
@ -188,14 +137,24 @@ retry_lookup:
goto out;
}
ode = _dev_list_add(NFS_SERVER(pnfslay->plh_inode), d_id, od,
gfp_flags);
objio_seg->oc.ods[c] = &ode->od; /* must use container_of */
dprintk("Adding new dev_id(%llx:%llx)\n",
_DEVID_LO(d_id), _DEVID_HI(d_id));
_DEVID_LO(&pdev->dev_id), _DEVID_HI(&pdev->dev_id));
ode = kzalloc(sizeof(*ode), gfp_flags);
if (!ode) {
dprintk("%s: -ENOMEM od=%p\n", __func__, od);
goto out;
}
nfs4_init_deviceid_node(&ode->id_node, server, &pdev->dev_id);
kfree(deviceaddr);
ode->od.od = od;
return &ode->id_node;
out:
objlayout_put_deviceinfo(deviceaddr);
return err;
kfree(deviceaddr);
return NULL;
}
static void copy_single_comp(struct ore_components *oc, unsigned c,
@ -254,6 +213,7 @@ int objio_alloc_lseg(struct pnfs_layout_segment **outp,
struct xdr_stream *xdr,
gfp_t gfp_flags)
{
struct nfs_server *server = NFS_SERVER(pnfslay->plh_inode);
struct objio_segment *objio_seg;
struct pnfs_osd_xdr_decode_layout_iter iter;
struct pnfs_osd_layout layout;
@ -283,13 +243,21 @@ int objio_alloc_lseg(struct pnfs_layout_segment **outp,
objio_seg->oc.first_dev = layout.olo_comps_index;
cur_comp = 0;
while (pnfs_osd_xdr_decode_layout_comp(&src_comp, &iter, xdr, &err)) {
struct nfs4_deviceid_node *d;
struct objio_dev_ent *ode;
copy_single_comp(&objio_seg->oc, cur_comp, &src_comp);
err = objio_devices_lookup(pnfslay, objio_seg, cur_comp,
&src_comp.oc_object_id.oid_device_id,
gfp_flags);
if (err)
d = nfs4_find_get_deviceid(server,
&src_comp.oc_object_id.oid_device_id,
pnfslay->plh_lc_cred, gfp_flags);
if (!d) {
err = -ENXIO;
goto err;
++cur_comp;
}
ode = container_of(d, struct objio_dev_ent, id_node);
objio_seg->oc.ods[cur_comp++] = &ode->od;
}
/* pnfs_osd_xdr_decode_layout_comp returns false on error */
if (unlikely(err))
@ -653,6 +621,7 @@ static struct pnfs_layoutdriver_type objlayout_type = {
.flags = PNFS_LAYOUTRET_ON_SETATTR |
PNFS_LAYOUTRET_ON_ERROR,
.max_deviceinfo_size = PAGE_SIZE,
.owner = THIS_MODULE,
.alloc_layout_hdr = objlayout_alloc_layout_hdr,
.free_layout_hdr = objlayout_free_layout_hdr,

View File

@ -574,76 +574,6 @@ loop_done:
dprintk("%s: Return\n", __func__);
}
/*
* Get Device Info API for io engines
*/
struct objlayout_deviceinfo {
struct page *page;
struct pnfs_osd_deviceaddr da; /* This must be last */
};
/* Initialize and call nfs_getdeviceinfo, then decode and return a
* "struct pnfs_osd_deviceaddr *" Eventually objlayout_put_deviceinfo()
* should be called.
*/
int objlayout_get_deviceinfo(struct pnfs_layout_hdr *pnfslay,
struct nfs4_deviceid *d_id, struct pnfs_osd_deviceaddr **deviceaddr,
gfp_t gfp_flags)
{
struct objlayout_deviceinfo *odi;
struct pnfs_device pd;
struct page *page, **pages;
u32 *p;
int err;
page = alloc_page(gfp_flags);
if (!page)
return -ENOMEM;
pages = &page;
pd.pages = pages;
memcpy(&pd.dev_id, d_id, sizeof(*d_id));
pd.layout_type = LAYOUT_OSD2_OBJECTS;
pd.pages = &page;
pd.pgbase = 0;
pd.pglen = PAGE_SIZE;
pd.mincount = 0;
pd.maxcount = PAGE_SIZE;
err = nfs4_proc_getdeviceinfo(NFS_SERVER(pnfslay->plh_inode), &pd,
pnfslay->plh_lc_cred);
dprintk("%s nfs_getdeviceinfo returned %d\n", __func__, err);
if (err)
goto err_out;
p = page_address(page);
odi = kzalloc(sizeof(*odi), gfp_flags);
if (!odi) {
err = -ENOMEM;
goto err_out;
}
pnfs_osd_xdr_decode_deviceaddr(&odi->da, p);
odi->page = page;
*deviceaddr = &odi->da;
return 0;
err_out:
__free_page(page);
return err;
}
void objlayout_put_deviceinfo(struct pnfs_osd_deviceaddr *deviceaddr)
{
struct objlayout_deviceinfo *odi = container_of(deviceaddr,
struct objlayout_deviceinfo,
da);
__free_page(odi->page);
kfree(odi);
}
enum {
OBJLAYOUT_MAX_URI_LEN = 256, OBJLAYOUT_MAX_OSDNAME_LEN = 64,
OBJLAYOUT_MAX_SYSID_HEX_LEN = OSD_SYSTEMID_LEN * 2 + 1,

View File

@ -149,11 +149,6 @@ extern void objlayout_read_done(struct objlayout_io_res *oir,
extern void objlayout_write_done(struct objlayout_io_res *oir,
ssize_t status, bool sync);
extern int objlayout_get_deviceinfo(struct pnfs_layout_hdr *pnfslay,
struct nfs4_deviceid *d_id, struct pnfs_osd_deviceaddr **deviceaddr,
gfp_t gfp_flags);
extern void objlayout_put_deviceinfo(struct pnfs_osd_deviceaddr *deviceaddr);
/*
* exported generic objects function vectors
*/

View File

@ -84,6 +84,7 @@ struct pnfs_layoutdriver_type {
const char *name;
struct module *owner;
unsigned flags;
unsigned max_deviceinfo_size;
int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
int (*clear_layoutdriver) (struct nfs_server *);
@ -126,6 +127,9 @@ struct pnfs_layoutdriver_type {
enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
void (*free_deviceid_node) (struct nfs4_deviceid_node *);
struct nfs4_deviceid_node * (*alloc_deviceid_node)
(struct nfs_server *server, struct pnfs_device *pdev,
gfp_t gfp_flags);
void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
struct xdr_stream *xdr,
@ -261,11 +265,12 @@ struct nfs4_deviceid_node {
atomic_t ref;
};
struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
struct nfs4_deviceid_node *
nfs4_find_get_deviceid(struct nfs_server *server,
const struct nfs4_deviceid *id, struct rpc_cred *cred,
gfp_t gfp_mask);
void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
const struct pnfs_layoutdriver_type *,
const struct nfs_client *,
void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
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 *);

View File

@ -29,6 +29,9 @@
*/
#include <linux/export.h>
#include <linux/nfs_fs.h>
#include "nfs4session.h"
#include "internal.h"
#include "pnfs.h"
#define NFSDBG_FACILITY NFSDBG_PNFS
@ -89,6 +92,74 @@ _lookup_deviceid(const struct pnfs_layoutdriver_type *ld,
return NULL;
}
static struct nfs4_deviceid_node *
nfs4_get_device_info(struct nfs_server *server,
const struct nfs4_deviceid *dev_id,
struct rpc_cred *cred, gfp_t gfp_flags)
{
struct nfs4_deviceid_node *d = NULL;
struct pnfs_device *pdev = NULL;
struct page **pages = NULL;
u32 max_resp_sz;
int max_pages;
int rc, i;
/*
* Use the session max response size as the basis for setting
* GETDEVICEINFO's maxcount
*/
max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
if (server->pnfs_curr_ld->max_deviceinfo_size &&
server->pnfs_curr_ld->max_deviceinfo_size < max_resp_sz)
max_resp_sz = server->pnfs_curr_ld->max_deviceinfo_size;
max_pages = nfs_page_array_len(0, max_resp_sz);
dprintk("%s: server %p max_resp_sz %u max_pages %d\n",
__func__, server, max_resp_sz, max_pages);
pdev = kzalloc(sizeof(*pdev), gfp_flags);
if (!pdev)
return NULL;
pages = kcalloc(max_pages, sizeof(struct page *), gfp_flags);
if (!pages)
goto out_free_pdev;
for (i = 0; i < max_pages; i++) {
pages[i] = alloc_page(gfp_flags);
if (!pages[i])
goto out_free_pages;
}
memcpy(&pdev->dev_id, dev_id, sizeof(*dev_id));
pdev->layout_type = server->pnfs_curr_ld->id;
pdev->pages = pages;
pdev->pgbase = 0;
pdev->pglen = max_resp_sz;
pdev->mincount = 0;
pdev->maxcount = max_resp_sz - nfs41_maxgetdevinfo_overhead;
rc = nfs4_proc_getdeviceinfo(server, pdev, cred);
dprintk("%s getdevice info returns %d\n", __func__, rc);
if (rc)
goto out_free_pages;
/*
* Found new device, need to decode it and then add it to the
* list of known devices for this mountpoint.
*/
d = server->pnfs_curr_ld->alloc_deviceid_node(server, pdev,
gfp_flags);
out_free_pages:
for (i = 0; i < max_pages; i++)
__free_page(pages[i]);
kfree(pages);
out_free_pdev:
kfree(pdev);
dprintk("<-- %s d %p\n", __func__, d);
return d;
}
/*
* Lookup a deviceid in cache and get a reference count on it if found
*
@ -96,14 +167,14 @@ _lookup_deviceid(const struct pnfs_layoutdriver_type *ld,
* @id deviceid to look up
*/
static struct nfs4_deviceid_node *
_find_get_deviceid(const struct pnfs_layoutdriver_type *ld,
const struct nfs_client *clp, const struct nfs4_deviceid *id,
long hash)
__nfs4_find_get_deviceid(struct nfs_server *server,
const struct nfs4_deviceid *id, long hash)
{
struct nfs4_deviceid_node *d;
rcu_read_lock();
d = _lookup_deviceid(ld, clp, id, hash);
d = _lookup_deviceid(server->pnfs_curr_ld, server->nfs_client, id,
hash);
if (d != NULL)
atomic_inc(&d->ref);
rcu_read_unlock();
@ -111,10 +182,33 @@ _find_get_deviceid(const struct pnfs_layoutdriver_type *ld,
}
struct nfs4_deviceid_node *
nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *ld,
const struct nfs_client *clp, const struct nfs4_deviceid *id)
nfs4_find_get_deviceid(struct nfs_server *server,
const struct nfs4_deviceid *id, struct rpc_cred *cred,
gfp_t gfp_mask)
{
return _find_get_deviceid(ld, clp, id, nfs4_deviceid_hash(id));
long hash = nfs4_deviceid_hash(id);
struct nfs4_deviceid_node *d, *new;
d = __nfs4_find_get_deviceid(server, id, hash);
if (d)
return d;
new = nfs4_get_device_info(server, id, cred, gfp_mask);
if (!new)
return new;
spin_lock(&nfs4_deviceid_lock);
d = __nfs4_find_get_deviceid(server, id, hash);
if (d) {
spin_unlock(&nfs4_deviceid_lock);
server->pnfs_curr_ld->free_deviceid_node(new);
return d;
}
hlist_add_head_rcu(&new->node, &nfs4_deviceid_cache[hash]);
atomic_inc(&new->ref);
spin_unlock(&nfs4_deviceid_lock);
return new;
}
EXPORT_SYMBOL_GPL(nfs4_find_get_deviceid);
@ -151,54 +245,19 @@ nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *ld,
EXPORT_SYMBOL_GPL(nfs4_delete_deviceid);
void
nfs4_init_deviceid_node(struct nfs4_deviceid_node *d,
const struct pnfs_layoutdriver_type *ld,
const struct nfs_client *nfs_client,
nfs4_init_deviceid_node(struct nfs4_deviceid_node *d, struct nfs_server *server,
const struct nfs4_deviceid *id)
{
INIT_HLIST_NODE(&d->node);
INIT_HLIST_NODE(&d->tmpnode);
d->ld = ld;
d->nfs_client = nfs_client;
d->ld = server->pnfs_curr_ld;
d->nfs_client = server->nfs_client;
d->flags = 0;
d->deviceid = *id;
atomic_set(&d->ref, 1);
}
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 the following members:
* new->ld
* new->nfs_client
* 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);
hash = nfs4_deviceid_hash(&new->deviceid);
d = _find_get_deviceid(new->ld, new->nfs_client, &new->deviceid, hash);
if (d) {
spin_unlock(&nfs4_deviceid_lock);
return d;
}
hlist_add_head_rcu(&new->node, &nfs4_deviceid_cache[hash]);
spin_unlock(&nfs4_deviceid_lock);
atomic_inc(&new->ref);
return new;
}
EXPORT_SYMBOL_GPL(nfs4_insert_deviceid_node);
/*
* Dereference a deviceid node and delete it when its reference count drops
* to zero.