Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / lockd / svcshare.c

diff --git a/kernel/fs/lockd/svcshare.c b/kernel/fs/lockd/svcshare.c
new file mode 100644 (file)
index 0000000..b0ae070
--- /dev/null
+++ b/kernel/fs/lockd/svcshare.c
@@ -0,0 +1,106 @@
+/*
+ * linux/fs/lockd/svcshare.c
+ *
+ * Management of DOS shares.
+ *
+ * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/time.h>
+#include <linux/unistd.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/svc.h>
+#include <linux/lockd/lockd.h>
+#include <linux/lockd/share.h>
+
+static inline int
+nlm_cmp_owner(struct nlm_share *share, struct xdr_netobj *oh)
+{
+       return share->s_owner.len == oh->len
+           && !memcmp(share->s_owner.data, oh->data, oh->len);
+}
+
+__be32
+nlmsvc_share_file(struct nlm_host *host, struct nlm_file *file,
+                       struct nlm_args *argp)
+{
+       struct nlm_share        *share;
+       struct xdr_netobj       *oh = &argp->lock.oh;
+       u8                      *ohdata;
+
+       for (share = file->f_shares; share; share = share->s_next) {
+               if (share->s_host == host && nlm_cmp_owner(share, oh))
+                       goto update;
+               if ((argp->fsm_access & share->s_mode)
+                || (argp->fsm_mode   & share->s_access ))
+                       return nlm_lck_denied;
+       }
+
+       share = kmalloc(sizeof(*share) + oh->len,
+                                               GFP_KERNEL);
+       if (share == NULL)
+               return nlm_lck_denied_nolocks;
+
+       /* Copy owner handle */
+       ohdata = (u8 *) (share + 1);
+       memcpy(ohdata, oh->data, oh->len);
+
+       share->s_file       = file;
+       share->s_host       = host;
+       share->s_owner.data = ohdata;
+       share->s_owner.len  = oh->len;
+       share->s_next       = file->f_shares;
+       file->f_shares      = share;
+
+update:
+       share->s_access = argp->fsm_access;
+       share->s_mode   = argp->fsm_mode;
+       return nlm_granted;
+}
+
+/*
+ * Delete a share.
+ */
+__be32
+nlmsvc_unshare_file(struct nlm_host *host, struct nlm_file *file,
+                       struct nlm_args *argp)
+{
+       struct nlm_share        *share, **shpp;
+       struct xdr_netobj       *oh = &argp->lock.oh;
+
+       for (shpp = &file->f_shares; (share = *shpp) != NULL;
+                                       shpp = &share->s_next) {
+               if (share->s_host == host && nlm_cmp_owner(share, oh)) {
+                       *shpp = share->s_next;
+                       kfree(share);
+                       return nlm_granted;
+               }
+       }
+
+       /* X/Open spec says return success even if there was no
+        * corresponding share. */
+       return nlm_granted;
+}
+
+/*
+ * Traverse all shares for a given file, and delete
+ * those owned by the given (type of) host
+ */
+void nlmsvc_traverse_shares(struct nlm_host *host, struct nlm_file *file,
+               nlm_host_match_fn_t match)
+{
+       struct nlm_share        *share, **shpp;
+
+       shpp = &file->f_shares;
+       while ((share = *shpp) !=  NULL) {
+               if (match(share->s_host, host)) {
+                       *shpp = share->s_next;
+                       kfree(share);
+                       continue;
+               }
+               shpp = &share->s_next;
+       }
+}