svcshare.c

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    1 /*
    2  * linux/fs/lockd/svcshare.c
    3  *
    4  * Management of DOS shares.
    5  *
    6  * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de>
    7  */
    8 
    9 #include <linux/sched.h>
   10 #include <linux/unistd.h>
   11 #include <linux/string.h>
   12 #include <linux/slab.h>
   13 
   14 #include <linux/sunrpc/clnt.h>
   15 #include <linux/sunrpc/svc.h>
   16 #include <linux/lockd/lockd.h>
   17 #include <linux/lockd/share.h>
   18 
   19 static inline int
   20 nlm_cmp_owner(struct nlm_share *share, struct xdr_netobj *oh)
   21 {
   22         return share->s_owner.len == oh->len
   23             && !memcmp(share->s_owner.data, oh->data, oh->len);
   24 }
   25 
   26 u32
   27 nlmsvc_share_file(struct nlm_host *host, struct nlm_file *file,
   28                         struct nlm_args *argp)
   29 {
   30         struct nlm_share        *share;
   31         struct xdr_netobj       *oh = &argp->lock.oh;
   32         u8                      *ohdata;
   33 
   34         for (share = file->f_shares; share; share = share->s_next) {
   35                 if (share->s_host == host && nlm_cmp_owner(share, oh))
   36                         goto update;
   37                 if ((argp->fsm_access & share->s_mode)
   38                  || (argp->fsm_mode   & share->s_access ))
   39                         return nlm_lck_denied;
   40         }
   41 
   42         share = (struct nlm_share *) kmalloc(sizeof(*share) + oh->len,
   43                                                 GFP_KERNEL);
   44         if (share == NULL)
   45                 return nlm_lck_denied_nolocks;
   46 
   47         /* Copy owner handle */
   48         ohdata = (u8 *) (share + 1);
   49         memcpy(ohdata, oh->data, oh->len);
   50 
   51         share->s_file       = file;
   52         share->s_host       = host;
   53         share->s_owner.data = ohdata;
   54         share->s_owner.len  = oh->len;
   55         share->s_next       = file->f_shares;
   56         file->f_shares      = share;
   57 
   58 update:
   59         share->s_access = argp->fsm_access;
   60         share->s_mode   = argp->fsm_mode;
   61         return nlm_granted;
   62 }
   63 
   64 /*
   65  * Delete a share.
   66  */
   67 u32
   68 nlmsvc_unshare_file(struct nlm_host *host, struct nlm_file *file,
   69                         struct nlm_args *argp)
   70 {
   71         struct nlm_share        *share, **shpp;
   72         struct xdr_netobj       *oh = &argp->lock.oh;
   73 
   74         for (shpp = &file->f_shares; (share = *shpp); shpp = &share->s_next) {
   75                 if (share->s_host == host && nlm_cmp_owner(share, oh)) {
   76                         *shpp = share->s_next;
   77                         kfree(share);
   78                         return nlm_granted;
   79                 }
   80         }
   81 
   82         /* X/Open spec says return success even if there was no
   83          * corresponding share. */
   84         return nlm_granted;
   85 }
   86 
   87 /*
   88  * Traverse all shares for a given file (and host).
   89  * NLM_ACT_CHECK is handled by nlmsvc_inspect_file.
   90  */
   91 int
   92 nlmsvc_traverse_shares(struct nlm_host *host, struct nlm_file *file, int action)
   93 {
   94         struct nlm_share        *share, **shpp;
   95 
   96         shpp = &file->f_shares;
   97         while ((share = *shpp) !=  NULL) {
   98                 if (action == NLM_ACT_MARK)
   99                         share->s_host->h_inuse = 1;
  100                 else if (action == NLM_ACT_UNLOCK) {
  101                         if (host == NULL || host == share->s_host) {
  102                                 *shpp = share->s_next;
  103                                 kfree(share);
  104                                 continue;
  105                         }
  106                 }
  107                 shpp = &share->s_next;
  108         }
  109 
  110         return 0;
  111 }

Cache object: 49eae857f543dff7d75070ebfe4d5acf

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FreeBSD/Linux Kernel Cross Reference sys/fs/lockd/svcshare.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/lockd/svcshare.c