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/nfs4.h>
   9 #include <linux/nfs_fs.h>
  10 #include "nfs4_fs.h"
  11 #include "callback.h"
  12 #include "delegation.h"
  13 #include "internal.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 nfs_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 = nfs_find_client(args->addr, 4);
  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 = delegation->change_attr;
  39         if (nfsi->npages != 0)
  40                 res->change_attr++;
  41         res->ctime = inode->i_ctime;
  42         res->mtime = inode->i_mtime;
  43         res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
  44                 args->bitmap[0];
  45         res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
  46                 args->bitmap[1];
  47         res->status = 0;
  48 out_iput:
  49         up_read(&nfsi->rwsem);
  50         iput(inode);
  51 out_putclient:
  52         nfs_put_client(clp);
  53 out:
  54         dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res->status));
  55         return res->status;
  56 }
  57
  58 unsigned nfs4_callback_recall(struct cb_recallargs *args, void *dummy)
  59 {
  60         struct nfs_client *clp;
  61         struct inode *inode;
  62         unsigned res;
  63
  64         res = htonl(NFS4ERR_BADHANDLE);
  65         clp = nfs_find_client(args->addr, 4);
  66         if (clp == NULL)
  67                 goto out;
  68         inode = nfs_delegation_find_inode(clp, &args->fh);
  69         if (inode == NULL)
  70                 goto out_putclient;
  71         /* Set up a helper thread to actually return the delegation */
  72         switch(nfs_async_inode_return_delegation(inode, &args->stateid)) {
  73                 case 0:
  74                         res = 0;
  75                         break;
  76                 case -ENOENT:
  77                         res = htonl(NFS4ERR_BAD_STATEID);
  78                         break;
  79                 default:
  80                         res = htonl(NFS4ERR_RESOURCE);
  81         }
  82         iput(inode);
  83 out_putclient:
  84         nfs_put_client(clp);
  85 out:
  86         dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res));
  87         return res;
  88 }