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 #include "xfs_vnodeops.h"
41
42 #include <linux/dcache.h>
43 #include <linux/smp_lock.h>
44
45 static struct vm_operations_struct xfs_file_vm_ops;
46 #ifdef CONFIG_XFS_DMAPI
47 static struct vm_operations_struct xfs_dmapi_file_vm_ops;
48 #endif
49
50 STATIC_INLINE ssize_t
51 __xfs_file_read(
52 struct kiocb *iocb,
53 const struct iovec *iov,
54 unsigned long nr_segs,
55 int ioflags,
56 loff_t pos)
57 {
58 struct file *file = iocb->ki_filp;
59
60 BUG_ON(iocb->ki_pos != pos);
61 if (unlikely(file->f_flags & O_DIRECT))
62 ioflags |= IO_ISDIRECT;
63 return xfs_read(XFS_I(file->f_path.dentry->d_inode), iocb, iov,
64 nr_segs, &iocb->ki_pos, ioflags);
65 }
66
67 STATIC ssize_t
68 xfs_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
77 STATIC ssize_t
78 xfs_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
87 STATIC_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
97 BUG_ON(iocb->ki_pos != pos);
98 if (unlikely(file->f_flags & O_DIRECT))
99 ioflags |= IO_ISDIRECT;
100 return xfs_write(XFS_I(file->f_mapping->host), iocb, iov, nr_segs,
101 &iocb->ki_pos, ioflags);
102 }
103
104 STATIC ssize_t
105 xfs_file_aio_write(
106 struct kiocb *iocb,
107 const struct iovec *iov,
108 unsigned long nr_segs,
109 loff_t pos)
110 {
111 return __xfs_file_write(iocb, iov, nr_segs, IO_ISAIO, pos);
112 }
113
114 STATIC ssize_t
115 xfs_file_aio_write_invis(
116 struct kiocb *iocb,
117 const struct iovec *iov,
118 unsigned long nr_segs,
119 loff_t pos)
120 {
121 return __xfs_file_write(iocb, iov, nr_segs, IO_ISAIO|IO_INVIS, pos);
122 }
123
124 STATIC ssize_t
125 xfs_file_splice_read(
126 struct file *infilp,
127 loff_t *ppos,
128 struct pipe_inode_info *pipe,
129 size_t len,
130 unsigned int flags)
131 {
132 return xfs_splice_read(XFS_I(infilp->f_path.dentry->d_inode),
133 infilp, ppos, pipe, len, flags, 0);
134 }
135
136 STATIC ssize_t
137 xfs_file_splice_read_invis(
138 struct file *infilp,
139 loff_t *ppos,
140 struct pipe_inode_info *pipe,
141 size_t len,
142 unsigned int flags)
143 {
144 return xfs_splice_read(XFS_I(infilp->f_path.dentry->d_inode),
145 infilp, ppos, pipe, len, flags, IO_INVIS);
146 }
147
148 STATIC ssize_t
149 xfs_file_splice_write(
150 struct pipe_inode_info *pipe,
151 struct file *outfilp,
152 loff_t *ppos,
153 size_t len,
154 unsigned int flags)
155 {
156 return xfs_splice_write(XFS_I(outfilp->f_path.dentry->d_inode),
157 pipe, outfilp, ppos, len, flags, 0);
158 }
159
160 STATIC ssize_t
161 xfs_file_splice_write_invis(
162 struct pipe_inode_info *pipe,
163 struct file *outfilp,
164 loff_t *ppos,
165 size_t len,
166 unsigned int flags)
167 {
168 return xfs_splice_write(XFS_I(outfilp->f_path.dentry->d_inode),
169 pipe, outfilp, ppos, len, flags, IO_INVIS);
170 }
171
172 STATIC int
173 xfs_file_open(
174 struct inode *inode,
175 struct file *filp)
176 {
177 if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
178 return -EFBIG;
179 return -xfs_open(XFS_I(inode));
180 }
181
182 STATIC int
183 xfs_file_release(
184 struct inode *inode,
185 struct file *filp)
186 {
187 return -xfs_release(XFS_I(inode));
188 }
189
190 STATIC int
191 xfs_file_fsync(
192 struct file *filp,
193 struct dentry *dentry,
194 int datasync)
195 {
196 int flags = FSYNC_WAIT;
197
198 if (datasync)
199 flags |= FSYNC_DATA;
200 xfs_iflags_clear(XFS_I(dentry->d_inode), XFS_ITRUNCATED);
201 return -xfs_fsync(XFS_I(dentry->d_inode), flags,
202 (xfs_off_t)0, (xfs_off_t)-1);
203 }
204
205 #ifdef CONFIG_XFS_DMAPI
206 STATIC int
207 xfs_vm_fault(
208 struct vm_area_struct *vma,
209 struct vm_fault *vmf)
210 {
211 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
212 bhv_vnode_t *vp = vn_from_inode(inode);
213
214 ASSERT_ALWAYS(vp->v_vfsp->vfs_flag & VFS_DMI);
215 if (XFS_SEND_MMAP(XFS_VFSTOM(vp->v_vfsp), vma, 0))
216 return VM_FAULT_SIGBUS;
217 return filemap_fault(vma, vmf);
218 }
219 #endif /* CONFIG_XFS_DMAPI */
220
221 /*
222 * Unfortunately we can't just use the clean and simple readdir implementation
223 * below, because nfs might call back into ->lookup from the filldir callback
224 * and that will deadlock the low-level btree code.
225 *
226 * Hopefully we'll find a better workaround that allows to use the optimal
227 * version at least for local readdirs for 2.6.25.
228 */
229 #if 0
230 STATIC int
231 xfs_file_readdir(
232 struct file *filp,
233 void *dirent,
234 filldir_t filldir)
235 {
236 struct inode *inode = filp->f_path.dentry->d_inode;
237 xfs_inode_t *ip = XFS_I(inode);
238 int error;
239 size_t bufsize;
240
241 /*
242 * The Linux API doesn't pass down the total size of the buffer
243 * we read into down to the filesystem. With the filldir concept
244 * it's not needed for correct information, but the XFS dir2 leaf
245 * code wants an estimate of the buffer size to calculate it's
246 * readahead window and size the buffers used for mapping to
247 * physical blocks.
248 *
249 * Try to give it an estimate that's good enough, maybe at some
250 * point we can change the ->readdir prototype to include the
251 * buffer size.
252 */
253 bufsize = (size_t)min_t(loff_t, PAGE_SIZE, inode->i_size);
254
255 error = xfs_readdir(ip, dirent, bufsize,
256 (xfs_off_t *)&filp->f_pos, filldir);
257 if (error)
258 return -error;
259 return 0;
260 }
261 #else
262
263 struct hack_dirent {
264 u64 ino;
265 loff_t offset;
266 int namlen;
267 unsigned int d_type;
268 char name[];
269 };
270
271 struct hack_callback {
272 char *dirent;
273 size_t len;
274 size_t used;
275 };
276
277 STATIC int
278 xfs_hack_filldir(
279 void *__buf,
280 const char *name,
281 int namlen,
282 loff_t offset,
283 u64 ino,
284 unsigned int d_type)
285 {
286 struct hack_callback *buf = __buf;
287 struct hack_dirent *de = (struct hack_dirent *)(buf->dirent + buf->used);
288 unsigned int reclen;
289
290 reclen = ALIGN(sizeof(struct hack_dirent) + namlen, sizeof(u64));
291 if (buf->used + reclen > buf->len)
292 return -EINVAL;
293
294 de->namlen = namlen;
295 de->offset = offset;
296 de->ino = ino;
297 de->d_type = d_type;
298 memcpy(de->name, name, namlen);
299 buf->used += reclen;
300 return 0;
301 }
302
303 STATIC int
304 xfs_file_readdir(
305 struct file *filp,
306 void *dirent,
307 filldir_t filldir)
308 {
309 struct inode *inode = filp->f_path.dentry->d_inode;
310 xfs_inode_t *ip = XFS_I(inode);
311 struct hack_callback buf;
312 struct hack_dirent *de;
313 int error;
314 loff_t size;
315 int eof = 0;
316 xfs_off_t start_offset, curr_offset, offset;
317
318 /*
319 * Try fairly hard to get memory
320 */
321 buf.len = PAGE_CACHE_SIZE;
322 do {
323 buf.dirent = kmalloc(buf.len, GFP_KERNEL);
324 if (buf.dirent)
325 break;
326 buf.len >>= 1;
327 } while (buf.len >= 1024);
328
329 if (!buf.dirent)
330 return -ENOMEM;
331
332 curr_offset = filp->f_pos;
333 if (curr_offset == 0x7fffffff)
334 offset = 0xffffffff;
335 else
336 offset = filp->f_pos;
337
338 while (!eof) {
339 unsigned int reclen;
340
341 start_offset = offset;
342
343 buf.used = 0;
344 error = -xfs_readdir(ip, &buf, buf.len, &offset,
345 xfs_hack_filldir);
346 if (error || offset == start_offset) {
347 size = 0;
348 break;
349 }
350
351 size = buf.used;
352 de = (struct hack_dirent *)buf.dirent;
353 while (size > 0) {
354 curr_offset = de->offset /* & 0x7fffffff */;
355 if (filldir(dirent, de->name, de->namlen,
356 curr_offset & 0x7fffffff,
357 de->ino, de->d_type)) {
358 goto done;
359 }
360
361 reclen = ALIGN(sizeof(struct hack_dirent) + de->namlen,
362 sizeof(u64));
363 size -= reclen;
364 de = (struct hack_dirent *)((char *)de + reclen);
365 }
366 }
367
368 done:
369 if (!error) {
370 if (size == 0)
371 filp->f_pos = offset & 0x7fffffff;
372 else if (de)
373 filp->f_pos = curr_offset;
374 }
375
376 kfree(buf.dirent);
377 return error;
378 }
379 #endif
380
381 STATIC int
382 xfs_file_mmap(
383 struct file *filp,
384 struct vm_area_struct *vma)
385 {
386 vma->vm_ops = &xfs_file_vm_ops;
387 vma->vm_flags |= VM_CAN_NONLINEAR;
388
389 #ifdef CONFIG_XFS_DMAPI
390 if (XFS_M(filp->f_path.dentry->d_inode->i_sb)->m_flags & XFS_MOUNT_DMAPI)
391 vma->vm_ops = &xfs_dmapi_file_vm_ops;
392 #endif /* CONFIG_XFS_DMAPI */
393
394 file_accessed(filp);
395 return 0;
396 }
397
398 STATIC long
399 xfs_file_ioctl(
400 struct file *filp,
401 unsigned int cmd,
402 unsigned long p)
403 {
404 int error;
405 struct inode *inode = filp->f_path.dentry->d_inode;
406
407 error = xfs_ioctl(XFS_I(inode), filp, 0, cmd, (void __user *)p);
408 xfs_iflags_set(XFS_I(inode), XFS_IMODIFIED);
409
410 /* NOTE: some of the ioctl's return positive #'s as a
411 * byte count indicating success, such as
412 * readlink_by_handle. So we don't "sign flip"
413 * like most other routines. This means true
414 * errors need to be returned as a negative value.
415 */
416 return error;
417 }
418
419 STATIC long
420 xfs_file_ioctl_invis(
421 struct file *filp,
422 unsigned int cmd,
423 unsigned long p)
424 {
425 int error;
426 struct inode *inode = filp->f_path.dentry->d_inode;
427
428 error = xfs_ioctl(XFS_I(inode), filp, IO_INVIS, cmd, (void __user *)p);
429 xfs_iflags_set(XFS_I(inode), XFS_IMODIFIED);
430
431 /* NOTE: some of the ioctl's return positive #'s as a
432 * byte count indicating success, such as
433 * readlink_by_handle. So we don't "sign flip"
434 * like most other routines. This means true
435 * errors need to be returned as a negative value.
436 */
437 return error;
438 }
439
440 #ifdef CONFIG_XFS_DMAPI
441 #ifdef HAVE_VMOP_MPROTECT
442 STATIC int
443 xfs_vm_mprotect(
444 struct vm_area_struct *vma,
445 unsigned int newflags)
446 {
447 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
448 struct xfs_mount *mp = XFS_M(inode->i_sb);
449 int error = 0;
450
451 if (mp->m_flags & XFS_MOUNT_DMAPI) {
452 if ((vma->vm_flags & VM_MAYSHARE) &&
453 (newflags & VM_WRITE) && !(vma->vm_flags & VM_WRITE))
454 error = XFS_SEND_MMAP(mp, vma, VM_WRITE);
455 }
456 return error;
457 }
458 #endif /* HAVE_VMOP_MPROTECT */
459 #endif /* CONFIG_XFS_DMAPI */
460
461 #ifdef HAVE_FOP_OPEN_EXEC
462 /* If the user is attempting to execute a file that is offline then
463 * we have to trigger a DMAPI READ event before the file is marked as busy
464 * otherwise the invisible I/O will not be able to write to the file to bring
465 * it back online.
466 */
467 STATIC int
468 xfs_file_open_exec(
469 struct inode *inode)
470 {
471 struct xfs_mount *mp = XFS_M(inode->i_sb);
472
473 if (unlikely(mp->m_flags & XFS_MOUNT_DMAPI)) {
474 if (DM_EVENT_ENABLED(XFS_I(inode), DM_EVENT_READ)) {
475 bhv_vnode_t *vp = vn_from_inode(inode);
476
477 return -XFS_SEND_DATA(mp, DM_EVENT_READ,
478 vp, 0, 0, 0, NULL);
479 }
480 }
481
482 return 0;
483 }
484 #endif /* HAVE_FOP_OPEN_EXEC */
485
486 /*
487 * mmap()d file has taken write protection fault and is being made
488 * writable. We can set the page state up correctly for a writable
489 * page, which means we can do correct delalloc accounting (ENOSPC
490 * checking!) and unwritten extent mapping.
491 */
492 STATIC int
493 xfs_vm_page_mkwrite(
494 struct vm_area_struct *vma,
495 struct page *page)
496 {
497 return block_page_mkwrite(vma, page, xfs_get_blocks);
498 }
499
500 const struct file_operations xfs_file_operations = {
501 .llseek = generic_file_llseek,
502 .read = do_sync_read,
503 .write = do_sync_write,
504 .aio_read = xfs_file_aio_read,
505 .aio_write = xfs_file_aio_write,
506 .splice_read = xfs_file_splice_read,
507 .splice_write = xfs_file_splice_write,
508 .unlocked_ioctl = xfs_file_ioctl,
509 #ifdef CONFIG_COMPAT
510 .compat_ioctl = xfs_file_compat_ioctl,
511 #endif
512 .mmap = xfs_file_mmap,
513 .open = xfs_file_open,
514 .release = xfs_file_release,
515 .fsync = xfs_file_fsync,
516 #ifdef HAVE_FOP_OPEN_EXEC
517 .open_exec = xfs_file_open_exec,
518 #endif
519 };
520
521 const struct file_operations xfs_invis_file_operations = {
522 .llseek = generic_file_llseek,
523 .read = do_sync_read,
524 .write = do_sync_write,
525 .aio_read = xfs_file_aio_read_invis,
526 .aio_write = xfs_file_aio_write_invis,
527 .splice_read = xfs_file_splice_read_invis,
528 .splice_write = xfs_file_splice_write_invis,
529 .unlocked_ioctl = xfs_file_ioctl_invis,
530 #ifdef CONFIG_COMPAT
531 .compat_ioctl = xfs_file_compat_invis_ioctl,
532 #endif
533 .mmap = xfs_file_mmap,
534 .open = xfs_file_open,
535 .release = xfs_file_release,
536 .fsync = xfs_file_fsync,
537 };
538
539
540 const struct file_operations xfs_dir_file_operations = {
541 .read = generic_read_dir,
542 .readdir = xfs_file_readdir,
543 .unlocked_ioctl = xfs_file_ioctl,
544 #ifdef CONFIG_COMPAT
545 .compat_ioctl = xfs_file_compat_ioctl,
546 #endif
547 .fsync = xfs_file_fsync,
548 };
549
550 static struct vm_operations_struct xfs_file_vm_ops = {
551 .fault = filemap_fault,
552 .page_mkwrite = xfs_vm_page_mkwrite,
553 };
554
555 #ifdef CONFIG_XFS_DMAPI
556 static struct vm_operations_struct xfs_dmapi_file_vm_ops = {
557 .fault = xfs_vm_fault,
558 .page_mkwrite = xfs_vm_page_mkwrite,
559 #ifdef HAVE_VMOP_MPROTECT
560 .mprotect = xfs_vm_mprotect,
561 #endif
562 };
563 #endif /* CONFIG_XFS_DMAPI */
564
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