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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it would be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
11 | * | |
12 | * Further, this software is distributed without any warranty that it is | |
13 | * free of the rightful claim of any third person regarding infringement | |
14 | * or the like. Any license provided herein, whether implied or | |
15 | * otherwise, applies only to this software file. Patent licenses, if | |
16 | * any, provided herein do not apply to combinations of this program with | |
17 | * other software, or any other product whatsoever. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write the Free Software Foundation, Inc., 59 | |
21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
22 | * | |
23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, | |
24 | * Mountain View, CA 94043, or: | |
25 | * | |
26 | * http://www.sgi.com | |
27 | * | |
28 | * For further information regarding this notice, see: | |
29 | * | |
30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ | |
31 | */ | |
32 | ||
33 | #include "xfs.h" | |
34 | #include "xfs_inum.h" | |
35 | #include "xfs_log.h" | |
36 | #include "xfs_sb.h" | |
37 | #include "xfs_dir.h" | |
38 | #include "xfs_dir2.h" | |
39 | #include "xfs_trans.h" | |
40 | #include "xfs_dmapi.h" | |
41 | #include "xfs_mount.h" | |
42 | #include "xfs_bmap_btree.h" | |
43 | #include "xfs_alloc_btree.h" | |
44 | #include "xfs_ialloc_btree.h" | |
45 | #include "xfs_alloc.h" | |
46 | #include "xfs_btree.h" | |
47 | #include "xfs_attr_sf.h" | |
48 | #include "xfs_dir_sf.h" | |
49 | #include "xfs_dir2_sf.h" | |
50 | #include "xfs_dinode.h" | |
51 | #include "xfs_inode.h" | |
52 | #include "xfs_error.h" | |
53 | #include "xfs_rw.h" | |
54 | #include "xfs_ioctl32.h" | |
55 | ||
56 | #include <linux/dcache.h> | |
57 | #include <linux/smp_lock.h> | |
58 | ||
59 | static struct vm_operations_struct linvfs_file_vm_ops; | |
60 | ||
61 | ||
62 | STATIC inline ssize_t | |
63 | __linvfs_read( | |
64 | struct kiocb *iocb, | |
65 | char __user *buf, | |
66 | int ioflags, | |
67 | size_t count, | |
68 | loff_t pos) | |
69 | { | |
70 | struct iovec iov = {buf, count}; | |
71 | struct file *file = iocb->ki_filp; | |
72 | vnode_t *vp = LINVFS_GET_VP(file->f_dentry->d_inode); | |
73 | ssize_t rval; | |
74 | ||
75 | BUG_ON(iocb->ki_pos != pos); | |
76 | ||
77 | if (unlikely(file->f_flags & O_DIRECT)) | |
78 | ioflags |= IO_ISDIRECT; | |
79 | VOP_READ(vp, iocb, &iov, 1, &iocb->ki_pos, ioflags, NULL, rval); | |
80 | return rval; | |
81 | } | |
82 | ||
83 | ||
84 | STATIC ssize_t | |
85 | linvfs_aio_read( | |
86 | struct kiocb *iocb, | |
87 | char __user *buf, | |
88 | size_t count, | |
89 | loff_t pos) | |
90 | { | |
91 | return __linvfs_read(iocb, buf, IO_ISAIO, count, pos); | |
92 | } | |
93 | ||
94 | STATIC ssize_t | |
95 | linvfs_aio_read_invis( | |
96 | struct kiocb *iocb, | |
97 | char __user *buf, | |
98 | size_t count, | |
99 | loff_t pos) | |
100 | { | |
101 | return __linvfs_read(iocb, buf, IO_ISAIO|IO_INVIS, count, pos); | |
102 | } | |
103 | ||
104 | ||
105 | STATIC inline ssize_t | |
106 | __linvfs_write( | |
107 | struct kiocb *iocb, | |
108 | const char __user *buf, | |
109 | int ioflags, | |
110 | size_t count, | |
111 | loff_t pos) | |
112 | { | |
113 | struct iovec iov = {(void __user *)buf, count}; | |
114 | struct file *file = iocb->ki_filp; | |
115 | struct inode *inode = file->f_mapping->host; | |
116 | vnode_t *vp = LINVFS_GET_VP(inode); | |
117 | ssize_t rval; | |
118 | ||
119 | BUG_ON(iocb->ki_pos != pos); | |
120 | if (unlikely(file->f_flags & O_DIRECT)) | |
121 | ioflags |= IO_ISDIRECT; | |
122 | ||
123 | VOP_WRITE(vp, iocb, &iov, 1, &iocb->ki_pos, ioflags, NULL, rval); | |
124 | return rval; | |
125 | } | |
126 | ||
127 | ||
128 | STATIC ssize_t | |
129 | linvfs_aio_write( | |
130 | struct kiocb *iocb, | |
131 | const char __user *buf, | |
132 | size_t count, | |
133 | loff_t pos) | |
134 | { | |
135 | return __linvfs_write(iocb, buf, IO_ISAIO, count, pos); | |
136 | } | |
137 | ||
138 | STATIC ssize_t | |
139 | linvfs_aio_write_invis( | |
140 | struct kiocb *iocb, | |
141 | const char __user *buf, | |
142 | size_t count, | |
143 | loff_t pos) | |
144 | { | |
145 | return __linvfs_write(iocb, buf, IO_ISAIO|IO_INVIS, count, pos); | |
146 | } | |
147 | ||
148 | ||
149 | STATIC inline ssize_t | |
150 | __linvfs_readv( | |
151 | struct file *file, | |
152 | const struct iovec *iov, | |
153 | int ioflags, | |
154 | unsigned long nr_segs, | |
155 | loff_t *ppos) | |
156 | { | |
157 | struct inode *inode = file->f_mapping->host; | |
158 | vnode_t *vp = LINVFS_GET_VP(inode); | |
159 | struct kiocb kiocb; | |
160 | ssize_t rval; | |
161 | ||
162 | init_sync_kiocb(&kiocb, file); | |
163 | kiocb.ki_pos = *ppos; | |
164 | ||
165 | if (unlikely(file->f_flags & O_DIRECT)) | |
166 | ioflags |= IO_ISDIRECT; | |
167 | VOP_READ(vp, &kiocb, iov, nr_segs, &kiocb.ki_pos, ioflags, NULL, rval); | |
168 | ||
169 | *ppos = kiocb.ki_pos; | |
170 | return rval; | |
171 | } | |
172 | ||
173 | STATIC ssize_t | |
174 | linvfs_readv( | |
175 | struct file *file, | |
176 | const struct iovec *iov, | |
177 | unsigned long nr_segs, | |
178 | loff_t *ppos) | |
179 | { | |
180 | return __linvfs_readv(file, iov, 0, nr_segs, ppos); | |
181 | } | |
182 | ||
183 | STATIC ssize_t | |
184 | linvfs_readv_invis( | |
185 | struct file *file, | |
186 | const struct iovec *iov, | |
187 | unsigned long nr_segs, | |
188 | loff_t *ppos) | |
189 | { | |
190 | return __linvfs_readv(file, iov, IO_INVIS, nr_segs, ppos); | |
191 | } | |
192 | ||
193 | ||
194 | STATIC inline ssize_t | |
195 | __linvfs_writev( | |
196 | struct file *file, | |
197 | const struct iovec *iov, | |
198 | int ioflags, | |
199 | unsigned long nr_segs, | |
200 | loff_t *ppos) | |
201 | { | |
202 | struct inode *inode = file->f_mapping->host; | |
203 | vnode_t *vp = LINVFS_GET_VP(inode); | |
204 | struct kiocb kiocb; | |
205 | ssize_t rval; | |
206 | ||
207 | init_sync_kiocb(&kiocb, file); | |
208 | kiocb.ki_pos = *ppos; | |
209 | if (unlikely(file->f_flags & O_DIRECT)) | |
210 | ioflags |= IO_ISDIRECT; | |
211 | ||
212 | VOP_WRITE(vp, &kiocb, iov, nr_segs, &kiocb.ki_pos, ioflags, NULL, rval); | |
213 | ||
214 | *ppos = kiocb.ki_pos; | |
215 | return rval; | |
216 | } | |
217 | ||
218 | ||
219 | STATIC ssize_t | |
220 | linvfs_writev( | |
221 | struct file *file, | |
222 | const struct iovec *iov, | |
223 | unsigned long nr_segs, | |
224 | loff_t *ppos) | |
225 | { | |
226 | return __linvfs_writev(file, iov, 0, nr_segs, ppos); | |
227 | } | |
228 | ||
229 | STATIC ssize_t | |
230 | linvfs_writev_invis( | |
231 | struct file *file, | |
232 | const struct iovec *iov, | |
233 | unsigned long nr_segs, | |
234 | loff_t *ppos) | |
235 | { | |
236 | return __linvfs_writev(file, iov, IO_INVIS, nr_segs, ppos); | |
237 | } | |
238 | ||
239 | STATIC ssize_t | |
240 | linvfs_sendfile( | |
241 | struct file *filp, | |
242 | loff_t *ppos, | |
243 | size_t count, | |
244 | read_actor_t actor, | |
245 | void *target) | |
246 | { | |
247 | vnode_t *vp = LINVFS_GET_VP(filp->f_dentry->d_inode); | |
248 | ssize_t rval; | |
249 | ||
250 | VOP_SENDFILE(vp, filp, ppos, 0, count, actor, target, NULL, rval); | |
251 | return rval; | |
252 | } | |
253 | ||
254 | ||
255 | STATIC int | |
256 | linvfs_open( | |
257 | struct inode *inode, | |
258 | struct file *filp) | |
259 | { | |
260 | vnode_t *vp = LINVFS_GET_VP(inode); | |
261 | int error; | |
262 | ||
263 | if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS) | |
264 | return -EFBIG; | |
265 | ||
266 | ASSERT(vp); | |
267 | VOP_OPEN(vp, NULL, error); | |
268 | return -error; | |
269 | } | |
270 | ||
271 | ||
272 | STATIC int | |
273 | linvfs_release( | |
274 | struct inode *inode, | |
275 | struct file *filp) | |
276 | { | |
277 | vnode_t *vp = LINVFS_GET_VP(inode); | |
278 | int error = 0; | |
279 | ||
280 | if (vp) | |
281 | VOP_RELEASE(vp, error); | |
282 | return -error; | |
283 | } | |
284 | ||
285 | ||
286 | STATIC int | |
287 | linvfs_fsync( | |
288 | struct file *filp, | |
289 | struct dentry *dentry, | |
290 | int datasync) | |
291 | { | |
292 | struct inode *inode = dentry->d_inode; | |
293 | vnode_t *vp = LINVFS_GET_VP(inode); | |
294 | int error; | |
295 | int flags = FSYNC_WAIT; | |
296 | ||
297 | if (datasync) | |
298 | flags |= FSYNC_DATA; | |
299 | ||
300 | ASSERT(vp); | |
301 | VOP_FSYNC(vp, flags, NULL, (xfs_off_t)0, (xfs_off_t)-1, error); | |
302 | return -error; | |
303 | } | |
304 | ||
305 | /* | |
306 | * linvfs_readdir maps to VOP_READDIR(). | |
307 | * We need to build a uio, cred, ... | |
308 | */ | |
309 | ||
310 | #define nextdp(dp) ((struct xfs_dirent *)((char *)(dp) + (dp)->d_reclen)) | |
311 | ||
312 | STATIC int | |
313 | linvfs_readdir( | |
314 | struct file *filp, | |
315 | void *dirent, | |
316 | filldir_t filldir) | |
317 | { | |
318 | int error = 0; | |
319 | vnode_t *vp; | |
320 | uio_t uio; | |
321 | iovec_t iov; | |
322 | int eof = 0; | |
323 | caddr_t read_buf; | |
324 | int namelen, size = 0; | |
325 | size_t rlen = PAGE_CACHE_SIZE; | |
326 | xfs_off_t start_offset, curr_offset; | |
327 | xfs_dirent_t *dbp = NULL; | |
328 | ||
329 | vp = LINVFS_GET_VP(filp->f_dentry->d_inode); | |
330 | ASSERT(vp); | |
331 | ||
332 | /* Try fairly hard to get memory */ | |
333 | do { | |
334 | if ((read_buf = (caddr_t)kmalloc(rlen, GFP_KERNEL))) | |
335 | break; | |
336 | rlen >>= 1; | |
337 | } while (rlen >= 1024); | |
338 | ||
339 | if (read_buf == NULL) | |
340 | return -ENOMEM; | |
341 | ||
342 | uio.uio_iov = &iov; | |
343 | uio.uio_segflg = UIO_SYSSPACE; | |
344 | curr_offset = filp->f_pos; | |
345 | if (filp->f_pos != 0x7fffffff) | |
346 | uio.uio_offset = filp->f_pos; | |
347 | else | |
348 | uio.uio_offset = 0xffffffff; | |
349 | ||
350 | while (!eof) { | |
351 | uio.uio_resid = iov.iov_len = rlen; | |
352 | iov.iov_base = read_buf; | |
353 | uio.uio_iovcnt = 1; | |
354 | ||
355 | start_offset = uio.uio_offset; | |
356 | ||
357 | VOP_READDIR(vp, &uio, NULL, &eof, error); | |
358 | if ((uio.uio_offset == start_offset) || error) { | |
359 | size = 0; | |
360 | break; | |
361 | } | |
362 | ||
363 | size = rlen - uio.uio_resid; | |
364 | dbp = (xfs_dirent_t *)read_buf; | |
365 | while (size > 0) { | |
366 | namelen = strlen(dbp->d_name); | |
367 | ||
368 | if (filldir(dirent, dbp->d_name, namelen, | |
369 | (loff_t) curr_offset & 0x7fffffff, | |
370 | (ino_t) dbp->d_ino, | |
371 | DT_UNKNOWN)) { | |
372 | goto done; | |
373 | } | |
374 | size -= dbp->d_reclen; | |
375 | curr_offset = (loff_t)dbp->d_off /* & 0x7fffffff */; | |
376 | dbp = nextdp(dbp); | |
377 | } | |
378 | } | |
379 | done: | |
380 | if (!error) { | |
381 | if (size == 0) | |
382 | filp->f_pos = uio.uio_offset & 0x7fffffff; | |
383 | else if (dbp) | |
384 | filp->f_pos = curr_offset; | |
385 | } | |
386 | ||
387 | kfree(read_buf); | |
388 | return -error; | |
389 | } | |
390 | ||
391 | ||
392 | STATIC int | |
393 | linvfs_file_mmap( | |
394 | struct file *filp, | |
395 | struct vm_area_struct *vma) | |
396 | { | |
397 | struct inode *ip = filp->f_dentry->d_inode; | |
398 | vnode_t *vp = LINVFS_GET_VP(ip); | |
399 | vattr_t va = { .va_mask = XFS_AT_UPDATIME }; | |
400 | int error; | |
401 | ||
402 | if (vp->v_vfsp->vfs_flag & VFS_DMI) { | |
403 | xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp); | |
404 | ||
405 | error = -XFS_SEND_MMAP(mp, vma, 0); | |
406 | if (error) | |
407 | return error; | |
408 | } | |
409 | ||
410 | vma->vm_ops = &linvfs_file_vm_ops; | |
411 | ||
412 | VOP_SETATTR(vp, &va, XFS_AT_UPDATIME, NULL, error); | |
413 | if (!error) | |
414 | vn_revalidate(vp); /* update Linux inode flags */ | |
415 | return 0; | |
416 | } | |
417 | ||
418 | ||
419 | STATIC long | |
420 | linvfs_ioctl( | |
421 | struct file *filp, | |
422 | unsigned int cmd, | |
423 | unsigned long arg) | |
424 | { | |
425 | int error; | |
426 | struct inode *inode = filp->f_dentry->d_inode; | |
427 | vnode_t *vp = LINVFS_GET_VP(inode); | |
428 | ||
429 | VOP_IOCTL(vp, inode, filp, 0, cmd, (void __user *)arg, error); | |
430 | VMODIFY(vp); | |
431 | ||
432 | /* NOTE: some of the ioctl's return positive #'s as a | |
433 | * byte count indicating success, such as | |
434 | * readlink_by_handle. So we don't "sign flip" | |
435 | * like most other routines. This means true | |
436 | * errors need to be returned as a negative value. | |
437 | */ | |
438 | return error; | |
439 | } | |
440 | ||
441 | STATIC long | |
442 | linvfs_ioctl_invis( | |
443 | struct file *filp, | |
444 | unsigned int cmd, | |
445 | unsigned long arg) | |
446 | { | |
447 | int error; | |
448 | struct inode *inode = filp->f_dentry->d_inode; | |
449 | vnode_t *vp = LINVFS_GET_VP(inode); | |
450 | ||
451 | ASSERT(vp); | |
452 | VOP_IOCTL(vp, inode, filp, IO_INVIS, cmd, (void __user *)arg, error); | |
453 | VMODIFY(vp); | |
454 | ||
455 | /* NOTE: some of the ioctl's return positive #'s as a | |
456 | * byte count indicating success, such as | |
457 | * readlink_by_handle. So we don't "sign flip" | |
458 | * like most other routines. This means true | |
459 | * errors need to be returned as a negative value. | |
460 | */ | |
461 | return error; | |
462 | } | |
463 | ||
464 | #ifdef HAVE_VMOP_MPROTECT | |
465 | STATIC int | |
466 | linvfs_mprotect( | |
467 | struct vm_area_struct *vma, | |
468 | unsigned int newflags) | |
469 | { | |
470 | vnode_t *vp = LINVFS_GET_VP(vma->vm_file->f_dentry->d_inode); | |
471 | int error = 0; | |
472 | ||
473 | if (vp->v_vfsp->vfs_flag & VFS_DMI) { | |
474 | if ((vma->vm_flags & VM_MAYSHARE) && | |
475 | (newflags & VM_WRITE) && !(vma->vm_flags & VM_WRITE)) { | |
476 | xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp); | |
477 | ||
478 | error = XFS_SEND_MMAP(mp, vma, VM_WRITE); | |
479 | } | |
480 | } | |
481 | return error; | |
482 | } | |
483 | #endif /* HAVE_VMOP_MPROTECT */ | |
484 | ||
485 | #ifdef HAVE_FOP_OPEN_EXEC | |
486 | /* If the user is attempting to execute a file that is offline then | |
487 | * we have to trigger a DMAPI READ event before the file is marked as busy | |
488 | * otherwise the invisible I/O will not be able to write to the file to bring | |
489 | * it back online. | |
490 | */ | |
491 | STATIC int | |
492 | linvfs_open_exec( | |
493 | struct inode *inode) | |
494 | { | |
495 | vnode_t *vp = LINVFS_GET_VP(inode); | |
496 | xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp); | |
497 | int error = 0; | |
498 | bhv_desc_t *bdp; | |
499 | xfs_inode_t *ip; | |
500 | ||
501 | if (vp->v_vfsp->vfs_flag & VFS_DMI) { | |
502 | bdp = vn_bhv_lookup(VN_BHV_HEAD(vp), &xfs_vnodeops); | |
503 | if (!bdp) { | |
504 | error = -EINVAL; | |
505 | goto open_exec_out; | |
506 | } | |
507 | ip = XFS_BHVTOI(bdp); | |
508 | if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ)) { | |
509 | error = -XFS_SEND_DATA(mp, DM_EVENT_READ, vp, | |
510 | 0, 0, 0, NULL); | |
511 | } | |
512 | } | |
513 | open_exec_out: | |
514 | return error; | |
515 | } | |
516 | #endif /* HAVE_FOP_OPEN_EXEC */ | |
517 | ||
518 | struct file_operations linvfs_file_operations = { | |
519 | .llseek = generic_file_llseek, | |
520 | .read = do_sync_read, | |
521 | .write = do_sync_write, | |
522 | .readv = linvfs_readv, | |
523 | .writev = linvfs_writev, | |
524 | .aio_read = linvfs_aio_read, | |
525 | .aio_write = linvfs_aio_write, | |
526 | .sendfile = linvfs_sendfile, | |
527 | .unlocked_ioctl = linvfs_ioctl, | |
528 | #ifdef CONFIG_COMPAT | |
529 | .compat_ioctl = xfs_compat_ioctl, | |
530 | #endif | |
531 | .mmap = linvfs_file_mmap, | |
532 | .open = linvfs_open, | |
533 | .release = linvfs_release, | |
534 | .fsync = linvfs_fsync, | |
535 | #ifdef HAVE_FOP_OPEN_EXEC | |
536 | .open_exec = linvfs_open_exec, | |
537 | #endif | |
538 | }; | |
539 | ||
540 | struct file_operations linvfs_invis_file_operations = { | |
541 | .llseek = generic_file_llseek, | |
542 | .read = do_sync_read, | |
543 | .write = do_sync_write, | |
544 | .readv = linvfs_readv_invis, | |
545 | .writev = linvfs_writev_invis, | |
546 | .aio_read = linvfs_aio_read_invis, | |
547 | .aio_write = linvfs_aio_write_invis, | |
548 | .sendfile = linvfs_sendfile, | |
549 | .unlocked_ioctl = linvfs_ioctl_invis, | |
550 | #ifdef CONFIG_COMPAT | |
551 | .compat_ioctl = xfs_compat_invis_ioctl, | |
552 | #endif | |
553 | .mmap = linvfs_file_mmap, | |
554 | .open = linvfs_open, | |
555 | .release = linvfs_release, | |
556 | .fsync = linvfs_fsync, | |
557 | }; | |
558 | ||
559 | ||
560 | struct file_operations linvfs_dir_operations = { | |
561 | .read = generic_read_dir, | |
562 | .readdir = linvfs_readdir, | |
563 | .unlocked_ioctl = linvfs_ioctl, | |
564 | .fsync = linvfs_fsync, | |
565 | }; | |
566 | ||
567 | static struct vm_operations_struct linvfs_file_vm_ops = { | |
568 | .nopage = filemap_nopage, | |
569 | .populate = filemap_populate, | |
570 | #ifdef HAVE_VMOP_MPROTECT | |
571 | .mprotect = linvfs_mprotect, | |
572 | #endif | |
573 | }; |