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 } 104