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 #include "nfs3_fs.h" 11 12 #define NFSDBG_FACILITY NFSDBG_PROC 13 14 struct posix_acl *nfs3_get_acl(struct inode *inode, int type) 15 { 16 struct nfs_server *server = NFS_SERVER(inode); 17 struct page *pages[NFSACL_MAXPAGES] = { }; 18 struct nfs3_getaclargs args = { 19 .fh = NFS_FH(inode), 20 /* The xdr layer may allocate pages here. */ 21 .pages = pages, 22 }; 23 struct nfs3_getaclres res = { 24 NULL, 25 }; 26 struct rpc_message msg = { 27 .rpc_argp = &args, 28 .rpc_resp = &res, 29 }; 30 int status, count; 31 32 if (!nfs_server_capable(inode, NFS_CAP_ACLS)) 33 return ERR_PTR(-EOPNOTSUPP); 34 35 status = nfs_revalidate_inode(server, inode); 36 if (status < 0) 37 return ERR_PTR(status); 38 39 /* 40 * Only get the access acl when explicitly requested: We don't 41 * need it for access decisions, and only some applications use 42 * it. Applications which request the access acl first are not 43 * penalized from this optimization. 44 */ 45 if (type == ACL_TYPE_ACCESS) 46 args.mask |= NFS_ACLCNT|NFS_ACL; 47 if (S_ISDIR(inode->i_mode)) 48 args.mask |= NFS_DFACLCNT|NFS_DFACL; 49 if (args.mask == 0) 50 return NULL; 51 52 dprintk("NFS call getacl\n"); 53 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_GETACL]; 54 res.fattr = nfs_alloc_fattr(); 55 if (res.fattr == NULL) 56 return ERR_PTR(-ENOMEM); 57 58 status = rpc_call_sync(server->client_acl, &msg, 0); 59 dprintk("NFS reply getacl: %d\n", status); 60 61 /* pages may have been allocated at the xdr layer. */ 62 for (count = 0; count < NFSACL_MAXPAGES && args.pages[count]; count++) 63 __free_page(args.pages[count]); 64 65 switch (status) { 66 case 0: 67 status = nfs_refresh_inode(inode, res.fattr); 68 break; 69 case -EPFNOSUPPORT: 70 case -EPROTONOSUPPORT: 71 dprintk("NFS_V3_ACL extension not supported; disabling\n"); 72 server->caps &= ~NFS_CAP_ACLS; 73 case -ENOTSUPP: 74 status = -EOPNOTSUPP; 75 default: 76 goto getout; 77 } 78 if ((args.mask & res.mask) != args.mask) { 79 status = -EIO; 80 goto getout; 81 } 82 83 if (res.acl_access != NULL) { 84 if ((posix_acl_equiv_mode(res.acl_access, NULL) == 0) || 85 res.acl_access->a_count == 0) { 86 posix_acl_release(res.acl_access); 87 res.acl_access = NULL; 88 } 89 } 90 91 if (res.mask & NFS_ACL) 92 set_cached_acl(inode, ACL_TYPE_ACCESS, res.acl_access); 93 else 94 forget_cached_acl(inode, ACL_TYPE_ACCESS); 95 96 if (res.mask & NFS_DFACL) 97 set_cached_acl(inode, ACL_TYPE_DEFAULT, res.acl_default); 98 else 99 forget_cached_acl(inode, ACL_TYPE_DEFAULT); 100 101 nfs_free_fattr(res.fattr); 102 if (type == ACL_TYPE_ACCESS) { 103 posix_acl_release(res.acl_default); 104 return res.acl_access; 105 } else { 106 posix_acl_release(res.acl_access); 107 return res.acl_default; 108 } 109 110 getout: 111 posix_acl_release(res.acl_access); 112 posix_acl_release(res.acl_default); 113 nfs_free_fattr(res.fattr); 114 return ERR_PTR(status); 115 } 116 117 static int __nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, 118 struct posix_acl *dfacl) 119 { 120 struct nfs_server *server = NFS_SERVER(inode); 121 struct nfs_fattr *fattr; 122 struct page *pages[NFSACL_MAXPAGES]; 123 struct nfs3_setaclargs args = { 124 .inode = inode, 125 .mask = NFS_ACL, 126 .acl_access = acl, 127 .pages = pages, 128 }; 129 struct rpc_message msg = { 130 .rpc_argp = &args, 131 .rpc_resp = &fattr, 132 }; 133 int status = 0; 134 135 if (acl == NULL && (!S_ISDIR(inode->i_mode) || dfacl == NULL)) 136 goto out; 137 138 status = -EOPNOTSUPP; 139 if (!nfs_server_capable(inode, NFS_CAP_ACLS)) 140 goto out; 141 142 /* We are doing this here because XDR marshalling does not 143 * return any results, it BUGs. */ 144 status = -ENOSPC; 145 if (acl != NULL && acl->a_count > NFS_ACL_MAX_ENTRIES) 146 goto out; 147 if (dfacl != NULL && dfacl->a_count > NFS_ACL_MAX_ENTRIES) 148 goto out; 149 if (S_ISDIR(inode->i_mode)) { 150 args.mask |= NFS_DFACL; 151 args.acl_default = dfacl; 152 args.len = nfsacl_size(acl, dfacl); 153 } else 154 args.len = nfsacl_size(acl, NULL); 155 156 if (args.len > NFS_ACL_INLINE_BUFSIZE) { 157 unsigned int npages = 1 + ((args.len - 1) >> PAGE_SHIFT); 158 159 status = -ENOMEM; 160 do { 161 args.pages[args.npages] = alloc_page(GFP_KERNEL); 162 if (args.pages[args.npages] == NULL) 163 goto out_freepages; 164 args.npages++; 165 } while (args.npages < npages); 166 } 167 168 dprintk("NFS call setacl\n"); 169 status = -ENOMEM; 170 fattr = nfs_alloc_fattr(); 171 if (fattr == NULL) 172 goto out_freepages; 173 174 msg.rpc_proc = &server->client_acl->cl_procinfo[ACLPROC3_SETACL]; 175 msg.rpc_resp = fattr; 176 status = rpc_call_sync(server->client_acl, &msg, 0); 177 nfs_access_zap_cache(inode); 178 nfs_zap_acl_cache(inode); 179 dprintk("NFS reply setacl: %d\n", status); 180 181 switch (status) { 182 case 0: 183 status = nfs_refresh_inode(inode, fattr); 184 set_cached_acl(inode, ACL_TYPE_ACCESS, acl); 185 set_cached_acl(inode, ACL_TYPE_DEFAULT, dfacl); 186 break; 187 case -EPFNOSUPPORT: 188 case -EPROTONOSUPPORT: 189 dprintk("NFS_V3_ACL SETACL RPC not supported" 190 "(will not retry)\n"); 191 server->caps &= ~NFS_CAP_ACLS; 192 case -ENOTSUPP: 193 status = -EOPNOTSUPP; 194 } 195 nfs_free_fattr(fattr); 196 out_freepages: 197 while (args.npages != 0) { 198 args.npages--; 199 __free_page(args.pages[args.npages]); 200 } 201 out: 202 return status; 203 } 204 205 int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, 206 struct posix_acl *dfacl) 207 { 208 int ret; 209 ret = __nfs3_proc_setacls(inode, acl, dfacl); 210 return (ret == -EOPNOTSUPP) ? 0 : ret; 211 212 } 213 214 int nfs3_set_acl(struct inode *inode, struct posix_acl *acl, int type) 215 { 216 struct posix_acl *alloc = NULL, *dfacl = NULL; 217 int status; 218 219 if (S_ISDIR(inode->i_mode)) { 220 switch(type) { 221 case ACL_TYPE_ACCESS: 222 alloc = dfacl = get_acl(inode, ACL_TYPE_DEFAULT); 223 if (IS_ERR(alloc)) 224 goto fail; 225 break; 226 227 case ACL_TYPE_DEFAULT: 228 dfacl = acl; 229 alloc = acl = get_acl(inode, ACL_TYPE_ACCESS); 230 if (IS_ERR(alloc)) 231 goto fail; 232 break; 233 } 234 } 235 236 if (acl == NULL) { 237 alloc = acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); 238 if (IS_ERR(alloc)) 239 goto fail; 240 } 241 status = __nfs3_proc_setacls(inode, acl, dfacl); 242 posix_acl_release(alloc); 243 return status; 244 245 fail: 246 return PTR_ERR(alloc); 247 } 248 249 const struct xattr_handler *nfs3_xattr_handlers[] = { 250 &posix_acl_access_xattr_handler, 251 &posix_acl_default_xattr_handler, 252 NULL, 253 }; 254 255 static int 256 nfs3_list_one_acl(struct inode *inode, int type, const char *name, void *data, 257 size_t size, ssize_t *result) 258 { 259 struct posix_acl *acl; 260 char *p = data + *result; 261 262 acl = get_acl(inode, type); 263 if (IS_ERR_OR_NULL(acl)) 264 return 0; 265 266 posix_acl_release(acl); 267 268 *result += strlen(name); 269 *result += 1; 270 if (!size) 271 return 0; 272 if (*result > size) 273 return -ERANGE; 274 275 strcpy(p, name); 276 return 0; 277 } 278 279 ssize_t 280 nfs3_listxattr(struct dentry *dentry, char *data, size_t size) 281 { 282 struct inode *inode = dentry->d_inode; 283 ssize_t result = 0; 284 int error; 285 286 error = nfs3_list_one_acl(inode, ACL_TYPE_ACCESS, 287 POSIX_ACL_XATTR_ACCESS, data, size, &result); 288 if (error) 289 return error; 290 291 error = nfs3_list_one_acl(inode, ACL_TYPE_DEFAULT, 292 POSIX_ACL_XATTR_DEFAULT, data, size, &result); 293 if (error) 294 return error; 295 return result; 296 } 297