1 #include <linux/fs.h> 2 #include <linux/gfp.h> 3 #include <linux/nfs.h> 4 #include <linux/nfs3.h> 5 #include <linux/nfs_fs.h> 6 #include <linux/posix_acl_xattr.h> 7 #include <linux/nfsacl.h> 8 9 #include "internal.h" 10 11 #define NFSDBG_FACILITY NFSDBG_PROC 12 13 struct posix_acl *nfs3_get_acl(struct inode *inode, int type) 14 { 15 struct nfs_server *server = NFS_SERVER(inode); 16 struct page *pages[NFSACL_MAXPAGES] = { }; 17 struct nfs3_getaclargs args = { 18 .fh = NFS_FH(inode), 19 /* The xdr layer may allocate pages here. */ 20 .pages = pages, 21 }; 22 struct nfs3_getaclres res = { 23 NULL, 24 }; 25 struct rpc_message msg = { 26 .rpc_argp = &args, 27 .rpc_resp = &res, 28 }; 29 int status, count; 30 31 if (!nfs_server_capable(inode, NFS_CAP_ACLS)) 32 return ERR_PTR(-EOPNOTSUPP); 33 34 status = nfs_revalidate_inode(server, inode); 35 if (status < 0) 36 return ERR_PTR(status); 37 38 /* 39 * Only get the access acl when explicitly requested: We don't 40 * need it for access decisions, and only some applications use 41 * it. Applications which request the access acl first are not 42 * penalized from this optimization. 43 */ 44 if (type == ACL_TYPE_ACCESS) 45 args.mask |= NFS_ACLCNT|NFS_ACL; 46 if (S_ISDIR(inode->i_mode)) 47 args.mask |= NFS_DFACLCNT|NFS_DFACL; 48 if (args.mask == 0) 49 return NULL; 50 51 dprintk("NFS call getacl\n"); 52 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL]; 53 res.fattr = nfs_alloc_fattr(); 54 if (res.fattr == NULL) 55 return ERR_PTR(-ENOMEM); 56 57 status = rpc_call_sync(server->client_acl, &msg, 0); 58 dprintk("NFS reply getacl: %d\n", status); 59 60 /* pages may have been allocated at the xdr layer. */ 61 for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++) 62 __free_page(args.pages[count]); 63 64 switch (status) { 65 case 0: 66 status = nfs_refresh_inode(inode, res.fattr); 67 break; 68 case -EPFNOSUPPORT: 69 case -EPROTONOSUPPORT: 70 dprintk("NFS_V3_ACL extension not supported; disabling\n"); 71 server->caps &= ~NFS_CAP_ACLS; 72 case -ENOTSUPP: 73 status = -EOPNOTSUPP; 74 default: 75 goto getout; 76 } 77 if ((args.mask & res.mask) != args.mask) { 78 status = -EIO; 79 goto getout; 80 } 81 82 if (res.acl_access != NULL) { 83 if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) || 84 res.acl_access->a_count == 0) { 85 posix_acl_release(res.acl_access); 86 res.acl_access = NULL; 87 } 88 } 89 90 if (res.mask & NFS_ACL) 91 set_cached_acl(inode, ACL_TYPE_ACCESS, res.acl_access); 92 else 93 forget_cached_acl(inode, ACL_TYPE_ACCESS); 94 95 if (res.mask & NFS_DFACL) 96 set_cached_acl(inode, ACL_TYPE_DEFAULT, res.acl_default); 97 else 98 forget_cached_acl(inode, ACL_TYPE_DEFAULT); 99 100 nfs_free_fattr(res.fattr); 101 if (type == ACL_TYPE_ACCESS) { 102 posix_acl_release(res.acl_default); 103 return res.acl_access; 104 } else { 105 posix_acl_release(res.acl_access); 106 return res.acl_default; 107 } 108 109 getout: 110 posix_acl_release(res.acl_access); 111 posix_acl_release(res.acl_default); 112 nfs_free_fattr(res.fattr); 113 return ERR_PTR(status); 114 } 115 116 static int __nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, 117 struct posix_acl *dfacl) 118 { 119 struct nfs_server *server = NFS_SERVER(inode); 120 struct nfs_fattr *fattr; 121 struct page *pages[NFSACL_MAXPAGES]; 122 struct nfs3_setaclargs args = { 123 .inode = inode, 124 .mask = NFS_ACL, 125 .acl_access = acl, 126 .pages = pages, 127 }; 128 struct rpc_message msg = { 129 .rpc_argp = &args, 130 .rpc_resp = &fattr, 131 }; 132 int status; 133 134 status = -EOPNOTSUPP; 135 if (!nfs_server_capable(inode, NFS_CAP_ACLS)) 136 goto out; 137 138 /* We are doing this here because XDR marshalling does not 139 * return any results, it BUGs. */ 140 status = -ENOSPC; 141 if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES) 142 goto out; 143 if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES) 144 goto out; 145 if (S_ISDIR(inode->i_mode)) { 146 args.mask |= NFS_DFACL; 147 args.acl_default = dfacl; 148 args.len = nfsacl_size(acl, dfacl); 149 } else 150 args.len = nfsacl_size(acl, NULL); 151 152 if (args.len > NFS_ACL_INLINE_BUFSIZE) { 153 unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT); 154 155 status = -ENOMEM; 156 do { 157 args.pages[args.npages] = alloc_page(GFP_KERNEL); 158 if (args.pages[args.npages] == NULL) 159 goto out_freepages; 160 args.npages++; 161 } while (args.npages < npages); 162 } 163 164 dprintk("NFS call setacl\n"); 165 status = -ENOMEM; 166 fattr = nfs_alloc_fattr(); 167 if (fattr == NULL) 168 goto out_freepages; 169 170 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL]; 171 msg.rpc_resp = fattr; 172 status = rpc_call_sync(server->client_acl, &msg, 0); 173 nfs_access_zap_cache(inode); 174 nfs_zap_acl_cache(inode); 175 dprintk("NFS reply setacl: %d\n", status); 176 177 switch (status) { 178 case 0: 179 status = nfs_refresh_inode(inode, fattr); 180 set_cached_acl(inode, ACL_TYPE_ACCESS, acl); 181 set_cached_acl(inode, ACL_TYPE_DEFAULT, dfacl); 182 break; 183 case -EPFNOSUPPORT: 184 case -EPROTONOSUPPORT: 185 dprintk("NFS_V3_ACL SETACL RPC not supported" 186 "(will not retry)\n"); 187 server->caps &= ~NFS_CAP_ACLS; 188 case -ENOTSUPP: 189 status = -EOPNOTSUPP; 190 } 191 nfs_free_fattr(fattr); 192 out_freepages: 193 while (args.npages != 0) { 194 args.npages--; 195 __free_page(args.pages[args.npages]); 196 } 197 out: 198 return status; 199 } 200 201 int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, 202 struct posix_acl *dfacl) 203 { 204 int ret; 205 ret = __nfs3_proc_setacls(inode, acl, dfacl); 206 return (ret == -EOPNOTSUPP) ? 0 : ret; 207 208 } 209 210 int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type) 211 { 212 struct posix_acl *alloc = NULL, *dfacl = NULL; 213 int status; 214 215 if (S_ISDIR(inode->i_mode)) { 216 switch(type) { 217 case ACL_TYPE_ACCESS: 218 alloc = dfacl = get_acl(inode, ACL_TYPE_DEFAULT); 219 if (IS_ERR(alloc)) 220 goto fail; 221 break; 222 223 case ACL_TYPE_DEFAULT: 224 dfacl = acl; 225 alloc = acl = get_acl(inode, ACL_TYPE_ACCESS); 226 if (IS_ERR(alloc)) 227 goto fail; 228 break; 229 } 230 } 231 232 if (acl == NULL) { 233 alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 234 if (IS_ERR(alloc)) 235 goto fail; 236 } 237 status = __nfs3_proc_setacls(inode, acl, dfacl); 238 posix_acl_release(alloc); 239 return status; 240 241 fail: 242 return PTR_ERR(alloc); 243 } 244 245 const struct xattr_handler *nfs3_xattr_handlers[] = { 246 &posix_acl_access_xattr_handler, 247 &posix_acl_default_xattr_handler, 248 NULL, 249 }; 250 251 static int 252 nfs3_list_one_acl(struct inode *inode, int type, const char *name, void *data, 253 size_t size, ssize_t *result) 254 { 255 struct posix_acl *acl; 256 char *p = data + *result; 257 258 acl = get_acl(inode, type); 259 if (!acl) 260 return 0; 261 262 posix_acl_release(acl); 263 264 *result += strlen(name); 265 *result += 1; 266 if (!size) 267 return 0; 268 if (*result > size) 269 return -ERANGE; 270 271 strcpy(p, name); 272 return 0; 273 } 274 275 ssize_t 276 nfs3_listxattr(struct dentry *dentry, char *data, size_t size) 277 { 278 struct inode *inode = dentry->d_inode; 279 ssize_t result = 0; 280 int error; 281 282 error = nfs3_list_one_acl(inode, ACL_TYPE_ACCESS, 283 POSIX_ACL_XATTR_ACCESS, data, size, &result); 284 if (error) 285 return error; 286 287 error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT, 288 POSIX_ACL_XATTR_DEFAULT, data, size, &result); 289 if (error) 290 return error; 291 return result; 292 } 293