fs/nfs/callback_proc.c

   1 /*
   2  * linux/fs/nfs/callback_proc.c
   3  *
   4  * Copyright (C) 2004 Trond Myklebust
   5  *
   6  * NFSv4 callback procedures
   7  */
   8 #include <linux/config.h>
   9 #include <linux/nfs4.h>
  10 #include <linux/nfs_fs.h>
  11 #include "nfs4_fs.h"
  12 #include "callback.h"
  13 #include "delegation.h"
  14
  15 #define NFSDBG_FACILITY NFSDBG_CALLBACK
  16
  17 unsigned nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res)
  18 {
  19         struct nfs4_client *clp;
  20         struct nfs_delegation *delegation;
  21         struct nfs_inode *nfsi;
  22         struct inode *inode;
  23
  24         res->bitmap[0] = res->bitmap[1] = 0;
  25         res->status = htonl(NFS4ERR_BADHANDLE);
  26         clp = nfs4_find_client(&args->addr->sin_addr);
  27         if (clp == NULL)
  28                 goto out;
  29         inode = nfs_delegation_find_inode(clp, &args->fh);
  30         if (inode == NULL)
  31                 goto out_putclient;
  32         nfsi = NFS_I(inode);
  33         down_read(&nfsi->rwsem);
  34         delegation = nfsi->delegation;
  35         if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
  36                 goto out_iput;
  37         res->size = i_size_read(inode);
  38         res->change_attr = NFS_CHANGE_ATTR(inode);
  39         res->ctime = inode->i_ctime;
  40         res->mtime = inode->i_mtime;
  41         res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
  42                 args->bitmap[0];
  43         res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
  44                 args->bitmap[1];
  45         res->status = 0;
  46 out_iput:
  47         up_read(&nfsi->rwsem);
  48         iput(inode);
  49 out_putclient:
  50         nfs4_put_client(clp);
  51 out:
  52         dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res->status));
  53         return res->status;
  54 }
  55
  56 unsigned nfs4_callback_recall(struct cb_recallargs *args, void *dummy)
  57 {
  58         struct nfs4_client *clp;
  59         struct inode *inode;
  60         unsigned res;
  61
  62         res = htonl(NFS4ERR_BADHANDLE);
  63         clp = nfs4_find_client(&args->addr->sin_addr);
  64         if (clp == NULL)
  65                 goto out;
  66         inode = nfs_delegation_find_inode(clp, &args->fh);
  67         if (inode == NULL)
  68                 goto out_putclient;
  69         /* Set up a helper thread to actually return the delegation */
  70         switch(nfs_async_inode_return_delegation(inode, &args->stateid)) {
  71                 case 0:
  72                         res = 0;
  73                         break;
  74                 case -ENOENT:
  75                         res = htonl(NFS4ERR_BAD_STATEID);
  76                         break;
  77                 default:
  78                         res = htonl(NFS4ERR_RESOURCE);
  79         }
  80         iput(inode);
  81 out_putclient:
  82         nfs4_put_client(clp);
  83 out:
  84         dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res));
  85         return res;
  86 }