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pnfs: add a common GETDEVICELIST implementation 

At a simple helper to issue a GETDEVICELIST operation and pre-load
the device id cache based on the result.

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 21:27:58 -07:00 committed by Trond Myklebust
parent 661373b13d
commit 9dd2fcd32f
2 changed files with 31 additions and 0 deletions
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2
fs/nfs/pnfs.h
View File

@ -277,6 +277,8 @@ bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
void nfs4_deviceid_purge_client(const struct nfs_client *);
int nfs4_deviceid_getdevicelist(struct nfs_server *server,
const struct nfs_fh *fh);
static inline struct pnfs_layout_segment *
pnfs_get_lseg(struct pnfs_layout_segment *lseg)

29
fs/nfs/pnfs_dev.c
View File

@ -359,3 +359,32 @@ nfs4_deviceid_mark_client_invalid(struct nfs_client *clp)
rcu_read_unlock();
}
int
nfs4_deviceid_getdevicelist(struct nfs_server *server,
const struct nfs_fh *fh)
{
struct pnfs_devicelist *dlist;
struct nfs4_deviceid_node *d;
int error = 0, i;
dlist = kzalloc(sizeof(struct pnfs_devicelist), GFP_NOFS);
if (!dlist)
return -ENOMEM;
while (!dlist->eof) {
error = nfs4_proc_getdevicelist(server, fh, dlist);
if (error)
break;
for (i = 0; i < dlist->num_devs; i++) {
d = nfs4_find_get_deviceid(server, &dlist->dev_id[i],
NULL, GFP_NOFS);
if (d)
nfs4_put_deviceid_node(d);
}
}
kfree(dlist);
return error;
}
EXPORT_SYMBOL_GPL(nfs4_deviceid_getdevicelist);