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
  14 #define NFSDBG_FACILITY NFSDBG_CALLBACK
  15
  16 unsigned nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res)
  17 {
  18         struct nfs4_client *clp;
  19         struct nfs_delegation *delegation;
  20         struct nfs_inode *nfsi;
  21         struct inode *inode;
  22
  23         res->bitmap[0] = res->bitmap[1] = 0;
  24         res->status = htonl(NFS4ERR_BADHANDLE);
  25         clp = nfs4_find_client(&args->addr->sin_addr);
  26         if (clp == NULL)
  27                 goto out;
  28         inode = nfs_delegation_find_inode(clp, &args->fh);
  29         if (inode == NULL)
  30                 goto out_putclient;
  31         nfsi = NFS_I(inode);
  32         down_read(&nfsi->rwsem);
  33         delegation = nfsi->delegation;
  34         if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
  35                 goto out_iput;
  36         res->size = i_size_read(inode);
  37         res->change_attr = delegation->change_attr;
  38         if (nfsi->npages != 0)
  39                 res->change_attr++;
  40         res->ctime = inode->i_ctime;
  41         res->mtime = inode->i_mtime;
  42         res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
  43                 args->bitmap[0];
  44         res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
  45                 args->bitmap[1];
  46         res->status = 0;
  47 out_iput:
  48         up_read(&nfsi->rwsem);
  49         iput(inode);
  50 out_putclient:
  51         nfs4_put_client(clp);
  52 out:
  53         dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res->status));
  54         return res->status;
  55 }
  56
  57 unsigned nfs4_callback_recall(struct cb_recallargs *args, void *dummy)
  58 {
  59         struct nfs4_client *clp;
  60         struct inode *inode;
  61         unsigned res;
  62
  63         res = htonl(NFS4ERR_BADHANDLE);
  64         clp = nfs4_find_client(&args->addr->sin_addr);
  65         if (clp == NULL)
  66                 goto out;
  67         inode = nfs_delegation_find_inode(clp, &args->fh);
  68         if (inode == NULL)
  69                 goto out_putclient;
  70         /* Set up a helper thread to actually return the delegation */
  71         switch(nfs_async_inode_return_delegation(inode, &args->stateid)) {
  72                 case 0:
  73                         res = 0;
  74                         break;
  75                 case -ENOENT:
  76                         res = htonl(NFS4ERR_BAD_STATEID);
  77                         break;
  78                 default:
  79                         res = htonl(NFS4ERR_RESOURCE);
  80         }
  81         iput(inode);
  82 out_putclient:
  83         nfs4_put_client(clp);
  84 out:
  85         dprintk("%s: exit with status = %d\n", __FUNCTION__, ntohl(res));
  86         return res;
  87 }