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   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 #ifdef NFS_DEBUG
  16 #define NFSDBG_FACILITY NFSDBG_CALLBACK
  17 #endif
  18
  19 __be32 nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res)
  20 {
  21         struct nfs_client *clp;
  22         struct nfs_delegation *delegation;
  23         struct nfs_inode *nfsi;
  24         struct inode *inode;
  25
  26         res->bitmap[0] = res->bitmap[1] = 0;
  27         res->status = htonl(NFS4ERR_BADHANDLE);
  28         clp = nfs_find_client(args->addr, 4);
  29         if (clp == NULL)
  30                 goto out;
  31
  32         dprintk("NFS: GETATTR callback request from %s\n",
  33                 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
  34
  35         inode = nfs_delegation_find_inode(clp, &args->fh);
  36         if (inode == NULL)
  37                 goto out_putclient;
  38         nfsi = NFS_I(inode);
  39         down_read(&nfsi->rwsem);
  40         delegation = nfsi->delegation;
  41         if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
  42                 goto out_iput;
  43         res->size = i_size_read(inode);
  44         res->change_attr = delegation->change_attr;
  45         if (nfsi->npages != 0)
  46                 res->change_attr++;
  47         res->ctime = inode->i_ctime;
  48         res->mtime = inode->i_mtime;
  49         res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
  50                 args->bitmap[0];
  51         res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
  52                 args->bitmap[1];
  53         res->status = 0;
  54 out_iput:
  55         up_read(&nfsi->rwsem);
  56         iput(inode);
  57 out_putclient:
  58         nfs_put_client(clp);
  59 out:
  60         dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
  61         return res->status;
  62 }
  63
  64 __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy)
  65 {
  66         struct nfs_client *clp;
  67         struct inode *inode;
  68         __be32 res;
  69
  70         res = htonl(NFS4ERR_BADHANDLE);
  71         clp = nfs_find_client(args->addr, 4);
  72         if (clp == NULL)
  73                 goto out;
  74
  75         dprintk("NFS: RECALL callback request from %s\n",
  76                 rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
  77
  78         do {
  79                 struct nfs_client *prev = clp;
  80
  81                 inode = nfs_delegation_find_inode(clp, &args->fh);
  82                 if (inode != NULL) {
  83                         /* Set up a helper thread to actually return the delegation */
  84                         switch(nfs_async_inode_return_delegation(inode, &args->stateid)) {
  85                                 case 0:
  86                                         res = 0;
  87                                         break;
  88                                 case -ENOENT:
  89                                         if (res != 0)
  90                                                 res = htonl(NFS4ERR_BAD_STATEID);
  91                                         break;
  92                                 default:
  93                                         res = htonl(NFS4ERR_RESOURCE);
  94                         }
  95                         iput(inode);
  96                 }
  97                 clp = nfs_find_client_next(prev);
  98                 nfs_put_client(prev);
  99         } while (clp != NULL);
 100 out:
 101         dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
 102         return res;
 103 }