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Diffstat (limited to 'fs/nfsd/nfs4state.c')
-rw-r--r--fs/nfsd/nfs4state.c36
1 files changed, 2 insertions, 34 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 16d39c6c4fbb..2e27430b9070 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -230,37 +230,6 @@ static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
230 __nfs4_file_put_access(fp, oflag); 230 __nfs4_file_put_access(fp, oflag);
231} 231}
232 232
233static inline int get_new_stid(struct nfs4_stid *stid)
234{
235 static int min_stateid = 0;
236 struct idr *stateids = &stid->sc_client->cl_stateids;
237 int new_stid;
238 int error;
239
240 error = idr_get_new_above(stateids, stid, min_stateid, &new_stid);
241 /*
242 * Note: the necessary preallocation was done in
243 * nfs4_alloc_stateid(). The idr code caps the number of
244 * preallocations that can exist at a time, but the state lock
245 * prevents anyone from using ours before we get here:
246 */
247 WARN_ON_ONCE(error);
248 /*
249 * It shouldn't be a problem to reuse an opaque stateid value.
250 * I don't think it is for 4.1. But with 4.0 I worry that, for
251 * example, a stray write retransmission could be accepted by
252 * the server when it should have been rejected. Therefore,
253 * adopt a trick from the sctp code to attempt to maximize the
254 * amount of time until an id is reused, by ensuring they always
255 * "increase" (mod INT_MAX):
256 */
257
258 min_stateid = new_stid+1;
259 if (min_stateid == INT_MAX)
260 min_stateid = 0;
261 return new_stid;
262}
263
264static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct 233static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct
265kmem_cache *slab) 234kmem_cache *slab)
266{ 235{
@@ -273,9 +242,8 @@ kmem_cache *slab)
273 if (!stid) 242 if (!stid)
274 return NULL; 243 return NULL;
275 244
276 if (!idr_pre_get(stateids, GFP_KERNEL)) 245 new_id = idr_alloc(stateids, stid, min_stateid, 0, GFP_KERNEL);
277 goto out_free; 246 if (new_id < 0)
278 if (idr_get_new_above(stateids, stid, min_stateid, &new_id))
279 goto out_free; 247 goto out_free;
280 stid->sc_client = cl; 248 stid->sc_client = cl;
281 stid->sc_type = 0; 249 stid->sc_type = 0;