1/* 2 * Copyright (c) 2000-2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 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 7 * published by the Free Software Foundation. 8 * 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. 13 * 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 17 */ 18#include "xfs.h" 19#include "xfs_bit.h" 20#include "xfs_log.h" 21#include "xfs_inum.h" 22#include "xfs_sb.h" 23#include "xfs_ag.h" 24#include "xfs_dir2.h" 25#include "xfs_trans.h" 26#include "xfs_dmapi.h" 27#include "xfs_mount.h" 28#include "xfs_bmap_btree.h" 29#include "xfs_alloc_btree.h" 30#include "xfs_ialloc_btree.h" 31#include "xfs_alloc.h" 32#include "xfs_btree.h" 33#include "xfs_attr_sf.h" 34#include "xfs_dir2_sf.h" 35#include "xfs_dinode.h" 36#include "xfs_inode.h" 37#include "xfs_error.h" 38#include "xfs_rw.h" 39#include "xfs_ioctl32.h" 40 41#include <linux/dcache.h> 42#include <linux/smp_lock.h> 43 44static struct vm_operations_struct xfs_file_vm_ops; 45#ifdef CONFIG_XFS_DMAPI 46static struct vm_operations_struct xfs_dmapi_file_vm_ops; 47#endif 48 49STATIC_INLINE ssize_t 50__xfs_file_read( 51 struct kiocb *iocb, 52 const struct iovec *iov, 53 unsigned long nr_segs, 54 int ioflags, 55 loff_t pos) 56{ 57 struct file *file = iocb->ki_filp; 58 bhv_vnode_t *vp = vn_from_inode(file->f_path.dentry->d_inode); 59 60 BUG_ON(iocb->ki_pos != pos); 61 if (unlikely(file->f_flags & O_DIRECT)) 62 ioflags |= IO_ISDIRECT; 63 return bhv_vop_read(vp, iocb, iov, nr_segs, &iocb->ki_pos, 64 ioflags, NULL); 65} 66 67STATIC ssize_t 68xfs_file_aio_read( 69 struct kiocb *iocb, 70 const struct iovec *iov, 71 unsigned long nr_segs, 72 loff_t pos) 73{ 74 return __xfs_file_read(iocb, iov, nr_segs, IO_ISAIO, pos); 75} 76 77STATIC ssize_t 78xfs_file_aio_read_invis( 79 struct kiocb *iocb, 80 const struct iovec *iov, 81 unsigned long nr_segs, 82 loff_t pos) 83{ 84 return __xfs_file_read(iocb, iov, nr_segs, IO_ISAIO|IO_INVIS, pos); 85} 86 87STATIC_INLINE ssize_t 88__xfs_file_write( 89 struct kiocb *iocb, 90 const struct iovec *iov, 91 unsigned long nr_segs, 92 int ioflags, 93 loff_t pos) 94{ 95 struct file *file = iocb->ki_filp; 96 struct inode *inode = file->f_mapping->host; 97 bhv_vnode_t *vp = vn_from_inode(inode); 98 99 BUG_ON(iocb->ki_pos != pos); 100 if (unlikely(file->f_flags & O_DIRECT)) 101 ioflags |= IO_ISDIRECT; 102 return bhv_vop_write(vp, iocb, iov, nr_segs, &iocb->ki_pos, 103 ioflags, NULL); 104} 105 106STATIC ssize_t 107xfs_file_aio_write( 108 struct kiocb *iocb, 109 const struct iovec *iov, 110 unsigned long nr_segs, 111 loff_t pos) 112{ 113 return __xfs_file_write(iocb, iov, nr_segs, IO_ISAIO, pos); 114} 115 116STATIC ssize_t 117xfs_file_aio_write_invis( 118 struct kiocb *iocb, 119 const struct iovec *iov, 120 unsigned long nr_segs, 121 loff_t pos) 122{ 123 return __xfs_file_write(iocb, iov, nr_segs, IO_ISAIO|IO_INVIS, pos); 124} 125 126STATIC ssize_t 127xfs_file_sendfile( 128 struct file *filp, 129 loff_t *pos, 130 size_t count, 131 read_actor_t actor, 132 void *target) 133{ 134 return bhv_vop_sendfile(vn_from_inode(filp->f_path.dentry->d_inode), 135 filp, pos, 0, count, actor, target, NULL); 136} 137 138STATIC ssize_t 139xfs_file_sendfile_invis( 140 struct file *filp, 141 loff_t *pos, 142 size_t count, 143 read_actor_t actor, 144 void *target) 145{ 146 return bhv_vop_sendfile(vn_from_inode(filp->f_path.dentry->d_inode), 147 filp, pos, IO_INVIS, count, actor, target, NULL); 148} 149 150STATIC ssize_t 151xfs_file_splice_read( 152 struct file *infilp, 153 loff_t *ppos, 154 struct pipe_inode_info *pipe, 155 size_t len, 156 unsigned int flags) 157{ 158 return bhv_vop_splice_read(vn_from_inode(infilp->f_path.dentry->d_inode), 159 infilp, ppos, pipe, len, flags, 0, NULL); 160} 161 162STATIC ssize_t 163xfs_file_splice_read_invis( 164 struct file *infilp, 165 loff_t *ppos, 166 struct pipe_inode_info *pipe, 167 size_t len, 168 unsigned int flags) 169{ 170 return bhv_vop_splice_read(vn_from_inode(infilp->f_path.dentry->d_inode), 171 infilp, ppos, pipe, len, flags, IO_INVIS, 172 NULL); 173} 174 175STATIC ssize_t 176xfs_file_splice_write( 177 struct pipe_inode_info *pipe, 178 struct file *outfilp, 179 loff_t *ppos, 180 size_t len, 181 unsigned int flags) 182{ 183 return bhv_vop_splice_write(vn_from_inode(outfilp->f_path.dentry->d_inode), 184 pipe, outfilp, ppos, len, flags, 0, NULL); 185} 186 187STATIC ssize_t 188xfs_file_splice_write_invis( 189 struct pipe_inode_info *pipe, 190 struct file *outfilp, 191 loff_t *ppos, 192 size_t len, 193 unsigned int flags) 194{ 195 return bhv_vop_splice_write(vn_from_inode(outfilp->f_path.dentry->d_inode), 196 pipe, outfilp, ppos, len, flags, IO_INVIS, 197 NULL); 198} 199 200STATIC int 201xfs_file_open( 202 struct inode *inode, 203 struct file *filp) 204{ 205 if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS) 206 return -EFBIG; 207 return -bhv_vop_open(vn_from_inode(inode), NULL); 208} 209 210STATIC int 211xfs_file_close( 212 struct file *filp, 213 fl_owner_t id) 214{ 215 return -bhv_vop_close(vn_from_inode(filp->f_path.dentry->d_inode), 0, 216 file_count(filp) > 1 ? L_FALSE : L_TRUE, NULL); 217} 218 219STATIC int 220xfs_file_release( 221 struct inode *inode, 222 struct file *filp) 223{ 224 bhv_vnode_t *vp = vn_from_inode(inode); 225 226 if (vp) 227 return -bhv_vop_release(vp); 228 return 0; 229} 230 231STATIC int 232xfs_file_fsync( 233 struct file *filp, 234 struct dentry *dentry, 235 int datasync) 236{ 237 bhv_vnode_t *vp = vn_from_inode(dentry->d_inode); 238 int flags = FSYNC_WAIT; 239 240 if (datasync) 241 flags |= FSYNC_DATA; 242 if (VN_TRUNC(vp)) 243 VUNTRUNCATE(vp); 244 return -bhv_vop_fsync(vp, flags, NULL, (xfs_off_t)0, (xfs_off_t)-1); 245} 246 247#ifdef CONFIG_XFS_DMAPI 248STATIC struct page * 249xfs_vm_nopage( 250 struct vm_area_struct *area, 251 unsigned long address, 252 int *type) 253{ 254 struct inode *inode = area->vm_file->f_path.dentry->d_inode; 255 bhv_vnode_t *vp = vn_from_inode(inode); 256 257 ASSERT_ALWAYS(vp->v_vfsp->vfs_flag & VFS_DMI); 258 if (XFS_SEND_MMAP(XFS_VFSTOM(vp->v_vfsp), area, 0)) 259 return NULL; 260 return filemap_nopage(area, address, type); 261} 262#endif /* CONFIG_XFS_DMAPI */ 263 264STATIC int 265xfs_file_readdir( 266 struct file *filp, 267 void *dirent, 268 filldir_t filldir) 269{ 270 int error = 0; 271 bhv_vnode_t *vp = vn_from_inode(filp->f_path.dentry->d_inode); 272 uio_t uio; 273 iovec_t iov; 274 int eof = 0; 275 caddr_t read_buf; 276 int namelen, size = 0; 277 size_t rlen = PAGE_CACHE_SIZE; 278 xfs_off_t start_offset, curr_offset; 279 xfs_dirent_t *dbp = NULL; 280 281 /* Try fairly hard to get memory */ 282 do { 283 if ((read_buf = kmalloc(rlen, GFP_KERNEL))) 284 break; 285 rlen >>= 1; 286 } while (rlen >= 1024); 287 288 if (read_buf == NULL) 289 return -ENOMEM; 290 291 uio.uio_iov = &iov; 292 uio.uio_segflg = UIO_SYSSPACE; 293 curr_offset = filp->f_pos; 294 if (filp->f_pos != 0x7fffffff) 295 uio.uio_offset = filp->f_pos; 296 else 297 uio.uio_offset = 0xffffffff; 298 299 while (!eof) { 300 uio.uio_resid = iov.iov_len = rlen; 301 iov.iov_base = read_buf; 302 uio.uio_iovcnt = 1; 303 304 start_offset = uio.uio_offset; 305 306 error = bhv_vop_readdir(vp, &uio, NULL, &eof); 307 if ((uio.uio_offset == start_offset) || error) { 308 size = 0; 309 break; 310 } 311 312 size = rlen - uio.uio_resid; 313 dbp = (xfs_dirent_t *)read_buf; 314 while (size > 0) { 315 namelen = strlen(dbp->d_name); 316 317 if (filldir(dirent, dbp->d_name, namelen, 318 (loff_t) curr_offset & 0x7fffffff, 319 (ino_t) dbp->d_ino, 320 DT_UNKNOWN)) { 321 goto done; 322 } 323 size -= dbp->d_reclen; 324 curr_offset = (loff_t)dbp->d_off /* & 0x7fffffff */; 325 dbp = (xfs_dirent_t *)((char *)dbp + dbp->d_reclen); 326 } 327 } 328done: 329 if (!error) { 330 if (size == 0) 331 filp->f_pos = uio.uio_offset & 0x7fffffff; 332 else if (dbp) 333 filp->f_pos = curr_offset; 334 } 335 336 kfree(read_buf); 337 return -error; 338} 339 340STATIC int 341xfs_file_mmap( 342 struct file *filp, 343 struct vm_area_struct *vma) 344{ 345 vma->vm_ops = &xfs_file_vm_ops; 346 347#ifdef CONFIG_XFS_DMAPI 348 if (vn_from_inode(filp->f_path.dentry->d_inode)->v_vfsp->vfs_flag & VFS_DMI) 349 vma->vm_ops = &xfs_dmapi_file_vm_ops; 350#endif /* CONFIG_XFS_DMAPI */ 351 352 file_accessed(filp); 353 return 0; 354} 355 356STATIC long 357xfs_file_ioctl( 358 struct file *filp, 359 unsigned int cmd, 360 unsigned long p) 361{ 362 int error; 363 struct inode *inode = filp->f_path.dentry->d_inode; 364 bhv_vnode_t *vp = vn_from_inode(inode); 365 366 error = bhv_vop_ioctl(vp, inode, filp, 0, cmd, (void __user *)p); 367 VMODIFY(vp); 368 369 /* NOTE: some of the ioctl's return positive #'s as a 370 * byte count indicating success, such as 371 * readlink_by_handle. So we don't "sign flip" 372 * like most other routines. This means true 373 * errors need to be returned as a negative value. 374 */ 375 return error; 376} 377 378STATIC long 379xfs_file_ioctl_invis( 380 struct file *filp, 381 unsigned int cmd, 382 unsigned long p) 383{ 384 int error; 385 struct inode *inode = filp->f_path.dentry->d_inode; 386 bhv_vnode_t *vp = vn_from_inode(inode); 387 388 error = bhv_vop_ioctl(vp, inode, filp, IO_INVIS, cmd, (void __user *)p); 389 VMODIFY(vp); 390 391 /* NOTE: some of the ioctl's return positive #'s as a 392 * byte count indicating success, such as 393 * readlink_by_handle. So we don't "sign flip" 394 * like most other routines. This means true 395 * errors need to be returned as a negative value. 396 */ 397 return error; 398} 399 400#ifdef CONFIG_XFS_DMAPI 401#ifdef HAVE_VMOP_MPROTECT 402STATIC int 403xfs_vm_mprotect( 404 struct vm_area_struct *vma, 405 unsigned int newflags) 406{ 407 bhv_vnode_t *vp = vn_from_inode(vma->vm_file->f_path.dentry->d_inode); 408 int error = 0; 409 410 if (vp->v_vfsp->vfs_flag & VFS_DMI) { 411 if ((vma->vm_flags & VM_MAYSHARE) && 412 (newflags & VM_WRITE) && !(vma->vm_flags & VM_WRITE)) { 413 xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp); 414 415 error = XFS_SEND_MMAP(mp, vma, VM_WRITE); 416 } 417 } 418 return error; 419} 420#endif /* HAVE_VMOP_MPROTECT */ 421#endif /* CONFIG_XFS_DMAPI */ 422 423#ifdef HAVE_FOP_OPEN_EXEC 424/* If the user is attempting to execute a file that is offline then 425 * we have to trigger a DMAPI READ event before the file is marked as busy 426 * otherwise the invisible I/O will not be able to write to the file to bring 427 * it back online. 428 */ 429STATIC int 430xfs_file_open_exec( 431 struct inode *inode) 432{ 433 bhv_vnode_t *vp = vn_from_inode(inode); 434 435 if (unlikely(vp->v_vfsp->vfs_flag & VFS_DMI)) { 436 xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp); 437 xfs_inode_t *ip = xfs_vtoi(vp); 438 439 if (!ip) 440 return -EINVAL; 441 if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ)) 442 return -XFS_SEND_DATA(mp, DM_EVENT_READ, vp, 443 0, 0, 0, NULL); 444 } 445 return 0; 446} 447#endif /* HAVE_FOP_OPEN_EXEC */ 448 449const struct file_operations xfs_file_operations = { 450 .llseek = generic_file_llseek, 451 .read = do_sync_read, 452 .write = do_sync_write, 453 .aio_read = xfs_file_aio_read, 454 .aio_write = xfs_file_aio_write, 455 .sendfile = xfs_file_sendfile, 456 .splice_read = xfs_file_splice_read, 457 .splice_write = xfs_file_splice_write, 458 .unlocked_ioctl = xfs_file_ioctl, 459#ifdef CONFIG_COMPAT 460 .compat_ioctl = xfs_file_compat_ioctl, 461#endif 462 .mmap = xfs_file_mmap, 463 .open = xfs_file_open, 464 .flush = xfs_file_close, 465 .release = xfs_file_release, 466 .fsync = xfs_file_fsync, 467#ifdef HAVE_FOP_OPEN_EXEC 468 .open_exec = xfs_file_open_exec, 469#endif 470}; 471 472const struct file_operations xfs_invis_file_operations = { 473 .llseek = generic_file_llseek, 474 .read = do_sync_read, 475 .write = do_sync_write, 476 .aio_read = xfs_file_aio_read_invis, 477 .aio_write = xfs_file_aio_write_invis, 478 .sendfile = xfs_file_sendfile_invis, 479 .splice_read = xfs_file_splice_read_invis, 480 .splice_write = xfs_file_splice_write_invis, 481 .unlocked_ioctl = xfs_file_ioctl_invis, 482#ifdef CONFIG_COMPAT 483 .compat_ioctl = xfs_file_compat_invis_ioctl, 484#endif 485 .mmap = xfs_file_mmap, 486 .open = xfs_file_open, 487 .flush = xfs_file_close, 488 .release = xfs_file_release, 489 .fsync = xfs_file_fsync, 490}; 491 492 493const struct file_operations xfs_dir_file_operations = { 494 .read = generic_read_dir, 495 .readdir = xfs_file_readdir, 496 .unlocked_ioctl = xfs_file_ioctl, 497#ifdef CONFIG_COMPAT 498 .compat_ioctl = xfs_file_compat_ioctl, 499#endif 500 .fsync = xfs_file_fsync, 501}; 502 503static struct vm_operations_struct xfs_file_vm_ops = { 504 .nopage = filemap_nopage, 505 .populate = filemap_populate, 506}; 507 508#ifdef CONFIG_XFS_DMAPI 509static struct vm_operations_struct xfs_dmapi_file_vm_ops = { 510 .nopage = xfs_vm_nopage, 511 .populate = filemap_populate, 512#ifdef HAVE_VMOP_MPROTECT 513 .mprotect = xfs_vm_mprotect, 514#endif 515}; 516#endif /* CONFIG_XFS_DMAPI */ 517