Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame^] | 2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| 3 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame^] | 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License as |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * published by the Free Software Foundation. |
| 8 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame^] | 9 | * This program is distributed in the hope that it would be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame^] | 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write the Free Software Foundation, |
| 16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include "xfs.h" |
| 19 | #include "xfs_fs.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 20 | #include "xfs_bit.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include "xfs_log.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 22 | #include "xfs_inum.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include "xfs_trans.h" |
| 24 | #include "xfs_sb.h" |
| 25 | #include "xfs_ag.h" |
| 26 | #include "xfs_dir.h" |
| 27 | #include "xfs_dir2.h" |
| 28 | #include "xfs_alloc.h" |
| 29 | #include "xfs_dmapi.h" |
| 30 | #include "xfs_quota.h" |
| 31 | #include "xfs_mount.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include "xfs_bmap_btree.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 33 | #include "xfs_alloc_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include "xfs_ialloc_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include "xfs_dir_sf.h" |
| 36 | #include "xfs_dir2_sf.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 37 | #include "xfs_attr_sf.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include "xfs_dinode.h" |
| 39 | #include "xfs_inode.h" |
| 40 | #include "xfs_bmap.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 41 | #include "xfs_btree.h" |
| 42 | #include "xfs_ialloc.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include "xfs_rtalloc.h" |
| 44 | #include "xfs_error.h" |
| 45 | #include "xfs_itable.h" |
| 46 | #include "xfs_rw.h" |
| 47 | #include "xfs_acl.h" |
| 48 | #include "xfs_cap.h" |
| 49 | #include "xfs_mac.h" |
| 50 | #include "xfs_attr.h" |
| 51 | #include "xfs_buf_item.h" |
| 52 | #include "xfs_utils.h" |
| 53 | |
| 54 | #include <linux/xattr.h> |
| 55 | #include <linux/namei.h> |
| 56 | |
Nathan Scott | 4aeb664 | 2005-11-02 11:43:58 +1100 | [diff] [blame] | 57 | /* |
| 58 | * Change the requested timestamp in the given inode. |
| 59 | * We don't lock across timestamp updates, and we don't log them but |
| 60 | * we do record the fact that there is dirty information in core. |
| 61 | * |
| 62 | * NOTE -- callers MUST combine XFS_ICHGTIME_MOD or XFS_ICHGTIME_CHG |
| 63 | * with XFS_ICHGTIME_ACC to be sure that access time |
| 64 | * update will take. Calling first with XFS_ICHGTIME_ACC |
| 65 | * and then XFS_ICHGTIME_MOD may fail to modify the access |
| 66 | * timestamp if the filesystem is mounted noacctm. |
| 67 | */ |
| 68 | void |
| 69 | xfs_ichgtime( |
| 70 | xfs_inode_t *ip, |
| 71 | int flags) |
| 72 | { |
| 73 | struct inode *inode = LINVFS_GET_IP(XFS_ITOV(ip)); |
| 74 | timespec_t tv; |
| 75 | |
| 76 | /* |
| 77 | * We're not supposed to change timestamps in readonly-mounted |
| 78 | * filesystems. Throw it away if anyone asks us. |
| 79 | */ |
| 80 | if (unlikely(IS_RDONLY(inode))) |
| 81 | return; |
| 82 | |
| 83 | /* |
| 84 | * Don't update access timestamps on reads if mounted "noatime". |
| 85 | * Throw it away if anyone asks us. |
| 86 | */ |
| 87 | if (unlikely( |
| 88 | (ip->i_mount->m_flags & XFS_MOUNT_NOATIME || IS_NOATIME(inode)) && |
| 89 | (flags & (XFS_ICHGTIME_ACC|XFS_ICHGTIME_MOD|XFS_ICHGTIME_CHG)) == |
| 90 | XFS_ICHGTIME_ACC)) |
| 91 | return; |
| 92 | |
| 93 | nanotime(&tv); |
| 94 | if (flags & XFS_ICHGTIME_MOD) { |
| 95 | inode->i_mtime = tv; |
| 96 | ip->i_d.di_mtime.t_sec = (__int32_t)tv.tv_sec; |
| 97 | ip->i_d.di_mtime.t_nsec = (__int32_t)tv.tv_nsec; |
| 98 | } |
| 99 | if (flags & XFS_ICHGTIME_ACC) { |
| 100 | inode->i_atime = tv; |
| 101 | ip->i_d.di_atime.t_sec = (__int32_t)tv.tv_sec; |
| 102 | ip->i_d.di_atime.t_nsec = (__int32_t)tv.tv_nsec; |
| 103 | } |
| 104 | if (flags & XFS_ICHGTIME_CHG) { |
| 105 | inode->i_ctime = tv; |
| 106 | ip->i_d.di_ctime.t_sec = (__int32_t)tv.tv_sec; |
| 107 | ip->i_d.di_ctime.t_nsec = (__int32_t)tv.tv_nsec; |
| 108 | } |
| 109 | |
| 110 | /* |
| 111 | * We update the i_update_core field _after_ changing |
| 112 | * the timestamps in order to coordinate properly with |
| 113 | * xfs_iflush() so that we don't lose timestamp updates. |
| 114 | * This keeps us from having to hold the inode lock |
| 115 | * while doing this. We use the SYNCHRONIZE macro to |
| 116 | * ensure that the compiler does not reorder the update |
| 117 | * of i_update_core above the timestamp updates above. |
| 118 | */ |
| 119 | SYNCHRONIZE(); |
| 120 | ip->i_update_core = 1; |
| 121 | if (!(inode->i_state & I_LOCK)) |
| 122 | mark_inode_dirty_sync(inode); |
| 123 | } |
| 124 | |
| 125 | /* |
| 126 | * Variant on the above which avoids querying the system clock |
| 127 | * in situations where we know the Linux inode timestamps have |
| 128 | * just been updated (and so we can update our inode cheaply). |
| 129 | * We also skip the readonly and noatime checks here, they are |
| 130 | * also catered for already. |
| 131 | */ |
| 132 | void |
| 133 | xfs_ichgtime_fast( |
| 134 | xfs_inode_t *ip, |
| 135 | struct inode *inode, |
| 136 | int flags) |
| 137 | { |
| 138 | timespec_t *tvp; |
| 139 | |
| 140 | /* |
| 141 | * We're not supposed to change timestamps in readonly-mounted |
| 142 | * filesystems. Throw it away if anyone asks us. |
| 143 | */ |
| 144 | if (unlikely(IS_RDONLY(inode))) |
| 145 | return; |
| 146 | |
| 147 | /* |
| 148 | * Don't update access timestamps on reads if mounted "noatime". |
| 149 | * Throw it away if anyone asks us. |
| 150 | */ |
| 151 | if (unlikely( |
| 152 | (ip->i_mount->m_flags & XFS_MOUNT_NOATIME || IS_NOATIME(inode)) && |
| 153 | ((flags & (XFS_ICHGTIME_ACC|XFS_ICHGTIME_MOD|XFS_ICHGTIME_CHG)) == |
| 154 | XFS_ICHGTIME_ACC))) |
| 155 | return; |
| 156 | |
| 157 | if (flags & XFS_ICHGTIME_MOD) { |
| 158 | tvp = &inode->i_mtime; |
| 159 | ip->i_d.di_mtime.t_sec = (__int32_t)tvp->tv_sec; |
| 160 | ip->i_d.di_mtime.t_nsec = (__int32_t)tvp->tv_nsec; |
| 161 | } |
| 162 | if (flags & XFS_ICHGTIME_ACC) { |
| 163 | tvp = &inode->i_atime; |
| 164 | ip->i_d.di_atime.t_sec = (__int32_t)tvp->tv_sec; |
| 165 | ip->i_d.di_atime.t_nsec = (__int32_t)tvp->tv_nsec; |
| 166 | } |
| 167 | if (flags & XFS_ICHGTIME_CHG) { |
| 168 | tvp = &inode->i_ctime; |
| 169 | ip->i_d.di_ctime.t_sec = (__int32_t)tvp->tv_sec; |
| 170 | ip->i_d.di_ctime.t_nsec = (__int32_t)tvp->tv_nsec; |
| 171 | } |
| 172 | |
| 173 | /* |
| 174 | * We update the i_update_core field _after_ changing |
| 175 | * the timestamps in order to coordinate properly with |
| 176 | * xfs_iflush() so that we don't lose timestamp updates. |
| 177 | * This keeps us from having to hold the inode lock |
| 178 | * while doing this. We use the SYNCHRONIZE macro to |
| 179 | * ensure that the compiler does not reorder the update |
| 180 | * of i_update_core above the timestamp updates above. |
| 181 | */ |
| 182 | SYNCHRONIZE(); |
| 183 | ip->i_update_core = 1; |
| 184 | if (!(inode->i_state & I_LOCK)) |
| 185 | mark_inode_dirty_sync(inode); |
| 186 | } |
| 187 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
| 189 | /* |
| 190 | * Pull the link count and size up from the xfs inode to the linux inode |
| 191 | */ |
| 192 | STATIC void |
| 193 | validate_fields( |
| 194 | struct inode *ip) |
| 195 | { |
| 196 | vnode_t *vp = LINVFS_GET_VP(ip); |
| 197 | vattr_t va; |
| 198 | int error; |
| 199 | |
| 200 | va.va_mask = XFS_AT_NLINK|XFS_AT_SIZE|XFS_AT_NBLOCKS; |
| 201 | VOP_GETATTR(vp, &va, ATTR_LAZY, NULL, error); |
| 202 | if (likely(!error)) { |
| 203 | ip->i_nlink = va.va_nlink; |
| 204 | ip->i_blocks = va.va_nblocks; |
| 205 | |
| 206 | /* we're under i_sem so i_size can't change under us */ |
| 207 | if (i_size_read(ip) != va.va_size) |
| 208 | i_size_write(ip, va.va_size); |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * Determine whether a process has a valid fs_struct (kernel daemons |
| 214 | * like knfsd don't have an fs_struct). |
| 215 | * |
| 216 | * XXX(hch): nfsd is broken, better fix it instead. |
| 217 | */ |
| 218 | STATIC inline int |
| 219 | has_fs_struct(struct task_struct *task) |
| 220 | { |
| 221 | return (task->fs != init_task.fs); |
| 222 | } |
| 223 | |
| 224 | STATIC int |
| 225 | linvfs_mknod( |
| 226 | struct inode *dir, |
| 227 | struct dentry *dentry, |
| 228 | int mode, |
| 229 | dev_t rdev) |
| 230 | { |
| 231 | struct inode *ip; |
| 232 | vattr_t va; |
| 233 | vnode_t *vp = NULL, *dvp = LINVFS_GET_VP(dir); |
| 234 | xfs_acl_t *default_acl = NULL; |
| 235 | attrexists_t test_default_acl = _ACL_DEFAULT_EXISTS; |
| 236 | int error; |
| 237 | |
| 238 | /* |
| 239 | * Irix uses Missed'em'V split, but doesn't want to see |
| 240 | * the upper 5 bits of (14bit) major. |
| 241 | */ |
| 242 | if (!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff) |
| 243 | return -EINVAL; |
| 244 | |
| 245 | if (test_default_acl && test_default_acl(dvp)) { |
| 246 | if (!_ACL_ALLOC(default_acl)) |
| 247 | return -ENOMEM; |
| 248 | if (!_ACL_GET_DEFAULT(dvp, default_acl)) { |
| 249 | _ACL_FREE(default_acl); |
| 250 | default_acl = NULL; |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | if (IS_POSIXACL(dir) && !default_acl && has_fs_struct(current)) |
| 255 | mode &= ~current->fs->umask; |
| 256 | |
| 257 | memset(&va, 0, sizeof(va)); |
| 258 | va.va_mask = XFS_AT_TYPE|XFS_AT_MODE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | va.va_mode = mode; |
| 260 | |
| 261 | switch (mode & S_IFMT) { |
| 262 | case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK: |
| 263 | va.va_rdev = sysv_encode_dev(rdev); |
| 264 | va.va_mask |= XFS_AT_RDEV; |
| 265 | /*FALLTHROUGH*/ |
| 266 | case S_IFREG: |
| 267 | VOP_CREATE(dvp, dentry, &va, &vp, NULL, error); |
| 268 | break; |
| 269 | case S_IFDIR: |
| 270 | VOP_MKDIR(dvp, dentry, &va, &vp, NULL, error); |
| 271 | break; |
| 272 | default: |
| 273 | error = EINVAL; |
| 274 | break; |
| 275 | } |
| 276 | |
| 277 | if (default_acl) { |
| 278 | if (!error) { |
| 279 | error = _ACL_INHERIT(vp, &va, default_acl); |
| 280 | if (!error) { |
| 281 | VMODIFY(vp); |
| 282 | } else { |
| 283 | struct dentry teardown = {}; |
| 284 | int err2; |
| 285 | |
| 286 | /* Oh, the horror. |
| 287 | * If we can't add the ACL we must back out. |
| 288 | * ENOSPC can hit here, among other things. |
| 289 | */ |
| 290 | teardown.d_inode = ip = LINVFS_GET_IP(vp); |
| 291 | teardown.d_name = dentry->d_name; |
| 292 | |
| 293 | vn_mark_bad(vp); |
| 294 | |
| 295 | if (S_ISDIR(mode)) |
| 296 | VOP_RMDIR(dvp, &teardown, NULL, err2); |
| 297 | else |
| 298 | VOP_REMOVE(dvp, &teardown, NULL, err2); |
| 299 | VN_RELE(vp); |
| 300 | } |
| 301 | } |
| 302 | _ACL_FREE(default_acl); |
| 303 | } |
| 304 | |
| 305 | if (!error) { |
| 306 | ASSERT(vp); |
| 307 | ip = LINVFS_GET_IP(vp); |
| 308 | |
| 309 | if (S_ISCHR(mode) || S_ISBLK(mode)) |
| 310 | ip->i_rdev = rdev; |
| 311 | else if (S_ISDIR(mode)) |
| 312 | validate_fields(ip); |
| 313 | d_instantiate(dentry, ip); |
| 314 | validate_fields(dir); |
| 315 | } |
| 316 | return -error; |
| 317 | } |
| 318 | |
| 319 | STATIC int |
| 320 | linvfs_create( |
| 321 | struct inode *dir, |
| 322 | struct dentry *dentry, |
| 323 | int mode, |
| 324 | struct nameidata *nd) |
| 325 | { |
| 326 | return linvfs_mknod(dir, dentry, mode, 0); |
| 327 | } |
| 328 | |
| 329 | STATIC int |
| 330 | linvfs_mkdir( |
| 331 | struct inode *dir, |
| 332 | struct dentry *dentry, |
| 333 | int mode) |
| 334 | { |
| 335 | return linvfs_mknod(dir, dentry, mode|S_IFDIR, 0); |
| 336 | } |
| 337 | |
| 338 | STATIC struct dentry * |
| 339 | linvfs_lookup( |
| 340 | struct inode *dir, |
| 341 | struct dentry *dentry, |
| 342 | struct nameidata *nd) |
| 343 | { |
| 344 | struct vnode *vp = LINVFS_GET_VP(dir), *cvp; |
| 345 | int error; |
| 346 | |
| 347 | if (dentry->d_name.len >= MAXNAMELEN) |
| 348 | return ERR_PTR(-ENAMETOOLONG); |
| 349 | |
| 350 | VOP_LOOKUP(vp, dentry, &cvp, 0, NULL, NULL, error); |
| 351 | if (error) { |
| 352 | if (unlikely(error != ENOENT)) |
| 353 | return ERR_PTR(-error); |
| 354 | d_add(dentry, NULL); |
| 355 | return NULL; |
| 356 | } |
| 357 | |
| 358 | return d_splice_alias(LINVFS_GET_IP(cvp), dentry); |
| 359 | } |
| 360 | |
| 361 | STATIC int |
| 362 | linvfs_link( |
| 363 | struct dentry *old_dentry, |
| 364 | struct inode *dir, |
| 365 | struct dentry *dentry) |
| 366 | { |
| 367 | struct inode *ip; /* inode of guy being linked to */ |
| 368 | vnode_t *tdvp; /* target directory for new name/link */ |
| 369 | vnode_t *vp; /* vp of name being linked */ |
| 370 | int error; |
| 371 | |
| 372 | ip = old_dentry->d_inode; /* inode being linked to */ |
| 373 | if (S_ISDIR(ip->i_mode)) |
| 374 | return -EPERM; |
| 375 | |
| 376 | tdvp = LINVFS_GET_VP(dir); |
| 377 | vp = LINVFS_GET_VP(ip); |
| 378 | |
| 379 | VOP_LINK(tdvp, vp, dentry, NULL, error); |
| 380 | if (!error) { |
| 381 | VMODIFY(tdvp); |
| 382 | VN_HOLD(vp); |
| 383 | validate_fields(ip); |
| 384 | d_instantiate(dentry, ip); |
| 385 | } |
| 386 | return -error; |
| 387 | } |
| 388 | |
| 389 | STATIC int |
| 390 | linvfs_unlink( |
| 391 | struct inode *dir, |
| 392 | struct dentry *dentry) |
| 393 | { |
| 394 | struct inode *inode; |
| 395 | vnode_t *dvp; /* directory containing name to remove */ |
| 396 | int error; |
| 397 | |
| 398 | inode = dentry->d_inode; |
| 399 | dvp = LINVFS_GET_VP(dir); |
| 400 | |
| 401 | VOP_REMOVE(dvp, dentry, NULL, error); |
| 402 | if (!error) { |
| 403 | validate_fields(dir); /* For size only */ |
| 404 | validate_fields(inode); |
| 405 | } |
| 406 | |
| 407 | return -error; |
| 408 | } |
| 409 | |
| 410 | STATIC int |
| 411 | linvfs_symlink( |
| 412 | struct inode *dir, |
| 413 | struct dentry *dentry, |
| 414 | const char *symname) |
| 415 | { |
| 416 | struct inode *ip; |
| 417 | vattr_t va; |
| 418 | vnode_t *dvp; /* directory containing name of symlink */ |
| 419 | vnode_t *cvp; /* used to lookup symlink to put in dentry */ |
| 420 | int error; |
| 421 | |
| 422 | dvp = LINVFS_GET_VP(dir); |
| 423 | cvp = NULL; |
| 424 | |
| 425 | memset(&va, 0, sizeof(va)); |
Christoph Hellwig | 0432dab | 2005-09-02 16:46:51 +1000 | [diff] [blame] | 426 | va.va_mode = S_IFLNK | |
| 427 | (irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | va.va_mask = XFS_AT_TYPE|XFS_AT_MODE; |
| 429 | |
| 430 | error = 0; |
| 431 | VOP_SYMLINK(dvp, dentry, &va, (char *)symname, &cvp, NULL, error); |
| 432 | if (!error && cvp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | ip = LINVFS_GET_IP(cvp); |
| 434 | d_instantiate(dentry, ip); |
| 435 | validate_fields(dir); |
| 436 | validate_fields(ip); /* size needs update */ |
| 437 | } |
| 438 | return -error; |
| 439 | } |
| 440 | |
| 441 | STATIC int |
| 442 | linvfs_rmdir( |
| 443 | struct inode *dir, |
| 444 | struct dentry *dentry) |
| 445 | { |
| 446 | struct inode *inode = dentry->d_inode; |
| 447 | vnode_t *dvp = LINVFS_GET_VP(dir); |
| 448 | int error; |
| 449 | |
| 450 | VOP_RMDIR(dvp, dentry, NULL, error); |
| 451 | if (!error) { |
| 452 | validate_fields(inode); |
| 453 | validate_fields(dir); |
| 454 | } |
| 455 | return -error; |
| 456 | } |
| 457 | |
| 458 | STATIC int |
| 459 | linvfs_rename( |
| 460 | struct inode *odir, |
| 461 | struct dentry *odentry, |
| 462 | struct inode *ndir, |
| 463 | struct dentry *ndentry) |
| 464 | { |
| 465 | struct inode *new_inode = ndentry->d_inode; |
| 466 | vnode_t *fvp; /* from directory */ |
| 467 | vnode_t *tvp; /* target directory */ |
| 468 | int error; |
| 469 | |
| 470 | fvp = LINVFS_GET_VP(odir); |
| 471 | tvp = LINVFS_GET_VP(ndir); |
| 472 | |
| 473 | VOP_RENAME(fvp, odentry, tvp, ndentry, NULL, error); |
| 474 | if (error) |
| 475 | return -error; |
| 476 | |
| 477 | if (new_inode) |
| 478 | validate_fields(new_inode); |
| 479 | |
| 480 | validate_fields(odir); |
| 481 | if (ndir != odir) |
| 482 | validate_fields(ndir); |
| 483 | return 0; |
| 484 | } |
| 485 | |
| 486 | /* |
| 487 | * careful here - this function can get called recursively, so |
| 488 | * we need to be very careful about how much stack we use. |
| 489 | * uio is kmalloced for this reason... |
| 490 | */ |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 491 | STATIC void * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | linvfs_follow_link( |
| 493 | struct dentry *dentry, |
| 494 | struct nameidata *nd) |
| 495 | { |
| 496 | vnode_t *vp; |
| 497 | uio_t *uio; |
| 498 | iovec_t iov; |
| 499 | int error; |
| 500 | char *link; |
| 501 | |
| 502 | ASSERT(dentry); |
| 503 | ASSERT(nd); |
| 504 | |
| 505 | link = (char *)kmalloc(MAXNAMELEN+1, GFP_KERNEL); |
| 506 | if (!link) { |
| 507 | nd_set_link(nd, ERR_PTR(-ENOMEM)); |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 508 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | } |
| 510 | |
| 511 | uio = (uio_t *)kmalloc(sizeof(uio_t), GFP_KERNEL); |
| 512 | if (!uio) { |
| 513 | kfree(link); |
| 514 | nd_set_link(nd, ERR_PTR(-ENOMEM)); |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 515 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | } |
| 517 | |
| 518 | vp = LINVFS_GET_VP(dentry->d_inode); |
| 519 | |
| 520 | iov.iov_base = link; |
| 521 | iov.iov_len = MAXNAMELEN; |
| 522 | |
| 523 | uio->uio_iov = &iov; |
| 524 | uio->uio_offset = 0; |
| 525 | uio->uio_segflg = UIO_SYSSPACE; |
| 526 | uio->uio_resid = MAXNAMELEN; |
| 527 | uio->uio_iovcnt = 1; |
| 528 | |
| 529 | VOP_READLINK(vp, uio, 0, NULL, error); |
| 530 | if (error) { |
| 531 | kfree(link); |
| 532 | link = ERR_PTR(-error); |
| 533 | } else { |
| 534 | link[MAXNAMELEN - uio->uio_resid] = '\0'; |
| 535 | } |
| 536 | kfree(uio); |
| 537 | |
| 538 | nd_set_link(nd, link); |
Al Viro | 008b150 | 2005-08-20 00:17:39 +0100 | [diff] [blame] | 539 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | } |
| 541 | |
Nathan Scott | cde410a | 2005-09-05 11:47:01 +1000 | [diff] [blame] | 542 | STATIC void |
| 543 | linvfs_put_link( |
| 544 | struct dentry *dentry, |
| 545 | struct nameidata *nd, |
| 546 | void *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | { |
Nathan Scott | cde410a | 2005-09-05 11:47:01 +1000 | [diff] [blame] | 548 | char *s = nd_get_link(nd); |
| 549 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | if (!IS_ERR(s)) |
| 551 | kfree(s); |
| 552 | } |
| 553 | |
| 554 | #ifdef CONFIG_XFS_POSIX_ACL |
| 555 | STATIC int |
| 556 | linvfs_permission( |
| 557 | struct inode *inode, |
| 558 | int mode, |
| 559 | struct nameidata *nd) |
| 560 | { |
| 561 | vnode_t *vp = LINVFS_GET_VP(inode); |
| 562 | int error; |
| 563 | |
| 564 | mode <<= 6; /* convert from linux to vnode access bits */ |
| 565 | VOP_ACCESS(vp, mode, NULL, error); |
| 566 | return -error; |
| 567 | } |
| 568 | #else |
| 569 | #define linvfs_permission NULL |
| 570 | #endif |
| 571 | |
| 572 | STATIC int |
| 573 | linvfs_getattr( |
| 574 | struct vfsmount *mnt, |
| 575 | struct dentry *dentry, |
| 576 | struct kstat *stat) |
| 577 | { |
| 578 | struct inode *inode = dentry->d_inode; |
| 579 | vnode_t *vp = LINVFS_GET_VP(inode); |
| 580 | int error = 0; |
| 581 | |
| 582 | if (unlikely(vp->v_flag & VMODIFIED)) |
| 583 | error = vn_revalidate(vp); |
| 584 | if (!error) |
| 585 | generic_fillattr(inode, stat); |
| 586 | return 0; |
| 587 | } |
| 588 | |
| 589 | STATIC int |
| 590 | linvfs_setattr( |
| 591 | struct dentry *dentry, |
| 592 | struct iattr *attr) |
| 593 | { |
| 594 | struct inode *inode = dentry->d_inode; |
| 595 | unsigned int ia_valid = attr->ia_valid; |
| 596 | vnode_t *vp = LINVFS_GET_VP(inode); |
| 597 | vattr_t vattr; |
| 598 | int flags = 0; |
| 599 | int error; |
| 600 | |
| 601 | memset(&vattr, 0, sizeof(vattr_t)); |
| 602 | if (ia_valid & ATTR_UID) { |
| 603 | vattr.va_mask |= XFS_AT_UID; |
| 604 | vattr.va_uid = attr->ia_uid; |
| 605 | } |
| 606 | if (ia_valid & ATTR_GID) { |
| 607 | vattr.va_mask |= XFS_AT_GID; |
| 608 | vattr.va_gid = attr->ia_gid; |
| 609 | } |
| 610 | if (ia_valid & ATTR_SIZE) { |
| 611 | vattr.va_mask |= XFS_AT_SIZE; |
| 612 | vattr.va_size = attr->ia_size; |
| 613 | } |
| 614 | if (ia_valid & ATTR_ATIME) { |
| 615 | vattr.va_mask |= XFS_AT_ATIME; |
| 616 | vattr.va_atime = attr->ia_atime; |
| 617 | } |
| 618 | if (ia_valid & ATTR_MTIME) { |
| 619 | vattr.va_mask |= XFS_AT_MTIME; |
| 620 | vattr.va_mtime = attr->ia_mtime; |
| 621 | } |
| 622 | if (ia_valid & ATTR_CTIME) { |
| 623 | vattr.va_mask |= XFS_AT_CTIME; |
| 624 | vattr.va_ctime = attr->ia_ctime; |
| 625 | } |
| 626 | if (ia_valid & ATTR_MODE) { |
| 627 | vattr.va_mask |= XFS_AT_MODE; |
| 628 | vattr.va_mode = attr->ia_mode; |
| 629 | if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID)) |
| 630 | inode->i_mode &= ~S_ISGID; |
| 631 | } |
| 632 | |
| 633 | if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET)) |
| 634 | flags |= ATTR_UTIME; |
| 635 | #ifdef ATTR_NO_BLOCK |
| 636 | if ((ia_valid & ATTR_NO_BLOCK)) |
| 637 | flags |= ATTR_NONBLOCK; |
| 638 | #endif |
| 639 | |
| 640 | VOP_SETATTR(vp, &vattr, flags, NULL, error); |
| 641 | if (error) |
| 642 | return -error; |
| 643 | vn_revalidate(vp); |
| 644 | return error; |
| 645 | } |
| 646 | |
| 647 | STATIC void |
| 648 | linvfs_truncate( |
| 649 | struct inode *inode) |
| 650 | { |
| 651 | block_truncate_page(inode->i_mapping, inode->i_size, linvfs_get_block); |
| 652 | } |
| 653 | |
| 654 | STATIC int |
| 655 | linvfs_setxattr( |
| 656 | struct dentry *dentry, |
| 657 | const char *name, |
| 658 | const void *data, |
| 659 | size_t size, |
| 660 | int flags) |
| 661 | { |
| 662 | vnode_t *vp = LINVFS_GET_VP(dentry->d_inode); |
| 663 | char *attr = (char *)name; |
| 664 | attrnames_t *namesp; |
| 665 | int xflags = 0; |
| 666 | int error; |
| 667 | |
| 668 | namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT); |
| 669 | if (!namesp) |
| 670 | return -EOPNOTSUPP; |
| 671 | attr += namesp->attr_namelen; |
| 672 | error = namesp->attr_capable(vp, NULL); |
| 673 | if (error) |
| 674 | return error; |
| 675 | |
| 676 | /* Convert Linux syscall to XFS internal ATTR flags */ |
| 677 | if (flags & XATTR_CREATE) |
| 678 | xflags |= ATTR_CREATE; |
| 679 | if (flags & XATTR_REPLACE) |
| 680 | xflags |= ATTR_REPLACE; |
| 681 | xflags |= namesp->attr_flag; |
| 682 | return namesp->attr_set(vp, attr, (void *)data, size, xflags); |
| 683 | } |
| 684 | |
| 685 | STATIC ssize_t |
| 686 | linvfs_getxattr( |
| 687 | struct dentry *dentry, |
| 688 | const char *name, |
| 689 | void *data, |
| 690 | size_t size) |
| 691 | { |
| 692 | vnode_t *vp = LINVFS_GET_VP(dentry->d_inode); |
| 693 | char *attr = (char *)name; |
| 694 | attrnames_t *namesp; |
| 695 | int xflags = 0; |
| 696 | ssize_t error; |
| 697 | |
| 698 | namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT); |
| 699 | if (!namesp) |
| 700 | return -EOPNOTSUPP; |
| 701 | attr += namesp->attr_namelen; |
| 702 | error = namesp->attr_capable(vp, NULL); |
| 703 | if (error) |
| 704 | return error; |
| 705 | |
| 706 | /* Convert Linux syscall to XFS internal ATTR flags */ |
| 707 | if (!size) { |
| 708 | xflags |= ATTR_KERNOVAL; |
| 709 | data = NULL; |
| 710 | } |
| 711 | xflags |= namesp->attr_flag; |
| 712 | return namesp->attr_get(vp, attr, (void *)data, size, xflags); |
| 713 | } |
| 714 | |
| 715 | STATIC ssize_t |
| 716 | linvfs_listxattr( |
| 717 | struct dentry *dentry, |
| 718 | char *data, |
| 719 | size_t size) |
| 720 | { |
| 721 | vnode_t *vp = LINVFS_GET_VP(dentry->d_inode); |
| 722 | int error, xflags = ATTR_KERNAMELS; |
| 723 | ssize_t result; |
| 724 | |
| 725 | if (!size) |
| 726 | xflags |= ATTR_KERNOVAL; |
| 727 | xflags |= capable(CAP_SYS_ADMIN) ? ATTR_KERNFULLS : ATTR_KERNORMALS; |
| 728 | |
| 729 | error = attr_generic_list(vp, data, size, xflags, &result); |
| 730 | if (error < 0) |
| 731 | return error; |
| 732 | return result; |
| 733 | } |
| 734 | |
| 735 | STATIC int |
| 736 | linvfs_removexattr( |
| 737 | struct dentry *dentry, |
| 738 | const char *name) |
| 739 | { |
| 740 | vnode_t *vp = LINVFS_GET_VP(dentry->d_inode); |
| 741 | char *attr = (char *)name; |
| 742 | attrnames_t *namesp; |
| 743 | int xflags = 0; |
| 744 | int error; |
| 745 | |
| 746 | namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT); |
| 747 | if (!namesp) |
| 748 | return -EOPNOTSUPP; |
| 749 | attr += namesp->attr_namelen; |
| 750 | error = namesp->attr_capable(vp, NULL); |
| 751 | if (error) |
| 752 | return error; |
| 753 | xflags |= namesp->attr_flag; |
| 754 | return namesp->attr_remove(vp, attr, xflags); |
| 755 | } |
| 756 | |
| 757 | |
| 758 | struct inode_operations linvfs_file_inode_operations = { |
| 759 | .permission = linvfs_permission, |
| 760 | .truncate = linvfs_truncate, |
| 761 | .getattr = linvfs_getattr, |
| 762 | .setattr = linvfs_setattr, |
| 763 | .setxattr = linvfs_setxattr, |
| 764 | .getxattr = linvfs_getxattr, |
| 765 | .listxattr = linvfs_listxattr, |
| 766 | .removexattr = linvfs_removexattr, |
| 767 | }; |
| 768 | |
| 769 | struct inode_operations linvfs_dir_inode_operations = { |
| 770 | .create = linvfs_create, |
| 771 | .lookup = linvfs_lookup, |
| 772 | .link = linvfs_link, |
| 773 | .unlink = linvfs_unlink, |
| 774 | .symlink = linvfs_symlink, |
| 775 | .mkdir = linvfs_mkdir, |
| 776 | .rmdir = linvfs_rmdir, |
| 777 | .mknod = linvfs_mknod, |
| 778 | .rename = linvfs_rename, |
| 779 | .permission = linvfs_permission, |
| 780 | .getattr = linvfs_getattr, |
| 781 | .setattr = linvfs_setattr, |
| 782 | .setxattr = linvfs_setxattr, |
| 783 | .getxattr = linvfs_getxattr, |
| 784 | .listxattr = linvfs_listxattr, |
| 785 | .removexattr = linvfs_removexattr, |
| 786 | }; |
| 787 | |
| 788 | struct inode_operations linvfs_symlink_inode_operations = { |
| 789 | .readlink = generic_readlink, |
| 790 | .follow_link = linvfs_follow_link, |
| 791 | .put_link = linvfs_put_link, |
| 792 | .permission = linvfs_permission, |
| 793 | .getattr = linvfs_getattr, |
| 794 | .setattr = linvfs_setattr, |
| 795 | .setxattr = linvfs_setxattr, |
| 796 | .getxattr = linvfs_getxattr, |
| 797 | .listxattr = linvfs_listxattr, |
| 798 | .removexattr = linvfs_removexattr, |
| 799 | }; |