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716154c5 BB |
1 | /*****************************************************************************\ |
2 | * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC. | |
3 | * Copyright (C) 2007 The Regents of the University of California. | |
4 | * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). | |
5 | * Written by Brian Behlendorf <behlendorf1@llnl.gov>. | |
715f6251 | 6 | * UCRL-CODE-235197 |
7 | * | |
716154c5 | 8 | * This file is part of the SPL, Solaris Porting Layer. |
3d6af2dd | 9 | * For details, see <http://zfsonlinux.org/>. |
716154c5 BB |
10 | * |
11 | * The SPL is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by the | |
13 | * Free Software Foundation; either version 2 of the License, or (at your | |
14 | * option) any later version. | |
715f6251 | 15 | * |
716154c5 | 16 | * The SPL is distributed in the hope that it will be useful, but WITHOUT |
715f6251 | 17 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
18 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
19 | * for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License along | |
716154c5 BB |
22 | * with the SPL. If not, see <http://www.gnu.org/licenses/>. |
23 | ***************************************************************************** | |
24 | * Solaris Porting Layer (SPL) Vnode Implementation. | |
25 | \*****************************************************************************/ | |
715f6251 | 26 | |
80093b6f | 27 | #include <sys/cred.h> |
4b171585 | 28 | #include <sys/vnode.h> |
10946b02 | 29 | #include <sys/kmem_cache.h> |
bbdc6ae4 | 30 | #include <linux/falloc.h> |
10946b02 | 31 | #include <linux/file_compat.h> |
937879f1 | 32 | |
51a727e9 | 33 | vnode_t *rootdir = (vnode_t *)0xabcd1234; |
4b171585 | 34 | EXPORT_SYMBOL(rootdir); |
35 | ||
7afde631 | 36 | static spl_kmem_cache_t *vn_cache; |
37 | static spl_kmem_cache_t *vn_file_cache; | |
e4f1d29f | 38 | |
83c623aa | 39 | static DEFINE_SPINLOCK(vn_file_lock); |
e4f1d29f | 40 | static LIST_HEAD(vn_file_list); |
af828292 | 41 | |
4295b530 BB |
42 | vtype_t |
43 | vn_mode_to_vtype(mode_t mode) | |
4b171585 | 44 | { |
45 | if (S_ISREG(mode)) | |
46 | return VREG; | |
47 | ||
48 | if (S_ISDIR(mode)) | |
49 | return VDIR; | |
50 | ||
51 | if (S_ISCHR(mode)) | |
52 | return VCHR; | |
53 | ||
54 | if (S_ISBLK(mode)) | |
55 | return VBLK; | |
56 | ||
57 | if (S_ISFIFO(mode)) | |
58 | return VFIFO; | |
59 | ||
60 | if (S_ISLNK(mode)) | |
61 | return VLNK; | |
62 | ||
63 | if (S_ISSOCK(mode)) | |
64 | return VSOCK; | |
65 | ||
66 | if (S_ISCHR(mode)) | |
67 | return VCHR; | |
68 | ||
69 | return VNON; | |
4295b530 BB |
70 | } /* vn_mode_to_vtype() */ |
71 | EXPORT_SYMBOL(vn_mode_to_vtype); | |
72 | ||
73 | mode_t | |
74 | vn_vtype_to_mode(vtype_t vtype) | |
75 | { | |
76 | if (vtype == VREG) | |
77 | return S_IFREG; | |
78 | ||
79 | if (vtype == VDIR) | |
80 | return S_IFDIR; | |
81 | ||
82 | if (vtype == VCHR) | |
83 | return S_IFCHR; | |
84 | ||
85 | if (vtype == VBLK) | |
86 | return S_IFBLK; | |
87 | ||
88 | if (vtype == VFIFO) | |
89 | return S_IFIFO; | |
90 | ||
91 | if (vtype == VLNK) | |
92 | return S_IFLNK; | |
93 | ||
94 | if (vtype == VSOCK) | |
95 | return S_IFSOCK; | |
96 | ||
97 | return VNON; | |
98 | } /* vn_vtype_to_mode() */ | |
99 | EXPORT_SYMBOL(vn_vtype_to_mode); | |
4b171585 | 100 | |
af828292 | 101 | vnode_t * |
102 | vn_alloc(int flag) | |
103 | { | |
104 | vnode_t *vp; | |
105 | ||
106 | vp = kmem_cache_alloc(vn_cache, flag); | |
af828292 | 107 | if (vp != NULL) { |
e4f1d29f | 108 | vp->v_file = NULL; |
af828292 | 109 | vp->v_type = 0; |
110 | } | |
111 | ||
10946b02 | 112 | return (vp); |
af828292 | 113 | } /* vn_alloc() */ |
114 | EXPORT_SYMBOL(vn_alloc); | |
115 | ||
116 | void | |
117 | vn_free(vnode_t *vp) | |
118 | { | |
119 | kmem_cache_free(vn_cache, vp); | |
120 | } /* vn_free() */ | |
121 | EXPORT_SYMBOL(vn_free); | |
122 | ||
0b3cf046 | 123 | int |
af828292 | 124 | vn_open(const char *path, uio_seg_t seg, int flags, int mode, |
4b171585 | 125 | vnode_t **vpp, int x1, void *x2) |
0b3cf046 | 126 | { |
f7e8739c RC |
127 | struct file *fp; |
128 | struct kstat stat; | |
129 | int rc, saved_umask = 0; | |
4be55565 | 130 | gfp_t saved_gfp; |
0b3cf046 | 131 | vnode_t *vp; |
0b3cf046 | 132 | |
937879f1 | 133 | ASSERT(flags & (FWRITE | FREAD)); |
134 | ASSERT(seg == UIO_SYSSPACE); | |
135 | ASSERT(vpp); | |
4b171585 | 136 | *vpp = NULL; |
137 | ||
138 | if (!(flags & FCREAT) && (flags & FWRITE)) | |
139 | flags |= FEXCL; | |
140 | ||
728b9dd8 | 141 | /* Note for filp_open() the two low bits must be remapped to mean: |
142 | * 01 - read-only -> 00 read-only | |
143 | * 10 - write-only -> 01 write-only | |
144 | * 11 - read-write -> 10 read-write | |
145 | */ | |
146 | flags--; | |
0b3cf046 | 147 | |
148 | if (flags & FCREAT) | |
4b171585 | 149 | saved_umask = xchg(¤t->fs->umask, 0); |
0b3cf046 | 150 | |
f7e8739c | 151 | fp = filp_open(path, flags, mode); |
0b3cf046 | 152 | |
153 | if (flags & FCREAT) | |
4b171585 | 154 | (void)xchg(¤t->fs->umask, saved_umask); |
0b3cf046 | 155 | |
f7e8739c | 156 | if (IS_ERR(fp)) |
10946b02 | 157 | return (-PTR_ERR(fp)); |
0b3cf046 | 158 | |
2a305c34 RY |
159 | #ifdef HAVE_2ARGS_VFS_GETATTR |
160 | rc = vfs_getattr(&fp->f_path, &stat); | |
161 | #else | |
bc90df66 | 162 | rc = vfs_getattr(fp->f_path.mnt, fp->f_dentry, &stat); |
2a305c34 | 163 | #endif |
4b171585 | 164 | if (rc) { |
165 | filp_close(fp, 0); | |
10946b02 | 166 | return (-rc); |
0b3cf046 | 167 | } |
168 | ||
af828292 | 169 | vp = vn_alloc(KM_SLEEP); |
4b171585 | 170 | if (!vp) { |
171 | filp_close(fp, 0); | |
10946b02 | 172 | return (ENOMEM); |
4b171585 | 173 | } |
0b3cf046 | 174 | |
4be55565 LW |
175 | saved_gfp = mapping_gfp_mask(fp->f_mapping); |
176 | mapping_set_gfp_mask(fp->f_mapping, saved_gfp & ~(__GFP_IO|__GFP_FS)); | |
177 | ||
e4f1d29f | 178 | mutex_enter(&vp->v_lock); |
4295b530 | 179 | vp->v_type = vn_mode_to_vtype(stat.mode); |
e4f1d29f | 180 | vp->v_file = fp; |
4be55565 | 181 | vp->v_gfp_mask = saved_gfp; |
4b171585 | 182 | *vpp = vp; |
e4f1d29f | 183 | mutex_exit(&vp->v_lock); |
0b3cf046 | 184 | |
10946b02 | 185 | return (0); |
4b171585 | 186 | } /* vn_open() */ |
187 | EXPORT_SYMBOL(vn_open); | |
0b3cf046 | 188 | |
0b3cf046 | 189 | int |
af828292 | 190 | vn_openat(const char *path, uio_seg_t seg, int flags, int mode, |
4b171585 | 191 | vnode_t **vpp, int x1, void *x2, vnode_t *vp, int fd) |
0b3cf046 | 192 | { |
4b171585 | 193 | char *realpath; |
12018327 | 194 | int len, rc; |
0b3cf046 | 195 | |
937879f1 | 196 | ASSERT(vp == rootdir); |
0b3cf046 | 197 | |
12018327 | 198 | len = strlen(path) + 2; |
10946b02 | 199 | realpath = kmalloc(len, kmem_flags_convert(KM_SLEEP)); |
4b171585 | 200 | if (!realpath) |
10946b02 | 201 | return (ENOMEM); |
0b3cf046 | 202 | |
12018327 | 203 | (void)snprintf(realpath, len, "/%s", path); |
4b171585 | 204 | rc = vn_open(realpath, seg, flags, mode, vpp, x1, x2); |
4b171585 | 205 | kfree(realpath); |
206 | ||
10946b02 | 207 | return (rc); |
4b171585 | 208 | } /* vn_openat() */ |
209 | EXPORT_SYMBOL(vn_openat); | |
0b3cf046 | 210 | |
0b3cf046 | 211 | int |
4b171585 | 212 | vn_rdwr(uio_rw_t uio, vnode_t *vp, void *addr, ssize_t len, offset_t off, |
663e02a1 | 213 | uio_seg_t seg, int ioflag, rlim64_t x2, void *x3, ssize_t *residp) |
0b3cf046 | 214 | { |
4b171585 | 215 | loff_t offset; |
216 | mm_segment_t saved_fs; | |
217 | struct file *fp; | |
218 | int rc; | |
219 | ||
937879f1 | 220 | ASSERT(uio == UIO_WRITE || uio == UIO_READ); |
221 | ASSERT(vp); | |
222 | ASSERT(vp->v_file); | |
223 | ASSERT(seg == UIO_SYSSPACE); | |
663e02a1 | 224 | ASSERT((ioflag & ~FAPPEND) == 0); |
937879f1 | 225 | ASSERT(x2 == RLIM64_INFINITY); |
4b171585 | 226 | |
e4f1d29f | 227 | fp = vp->v_file; |
4b171585 | 228 | |
663e02a1 RC |
229 | offset = off; |
230 | if (ioflag & FAPPEND) | |
231 | offset = fp->f_pos; | |
232 | ||
4b171585 | 233 | /* Writable user data segment must be briefly increased for this |
234 | * process so we can use the user space read call paths to write | |
235 | * in to memory allocated by the kernel. */ | |
236 | saved_fs = get_fs(); | |
237 | set_fs(get_ds()); | |
238 | ||
239 | if (uio & UIO_WRITE) | |
240 | rc = vfs_write(fp, addr, len, &offset); | |
241 | else | |
242 | rc = vfs_read(fp, addr, len, &offset); | |
243 | ||
244 | set_fs(saved_fs); | |
f3989ed3 | 245 | fp->f_pos = offset; |
4b171585 | 246 | |
247 | if (rc < 0) | |
10946b02 | 248 | return (-rc); |
0b3cf046 | 249 | |
4b171585 | 250 | if (residp) { |
251 | *residp = len - rc; | |
0b3cf046 | 252 | } else { |
4b171585 | 253 | if (rc != len) |
10946b02 | 254 | return (EIO); |
0b3cf046 | 255 | } |
256 | ||
10946b02 | 257 | return (0); |
4b171585 | 258 | } /* vn_rdwr() */ |
259 | EXPORT_SYMBOL(vn_rdwr); | |
260 | ||
261 | int | |
2f5d55aa | 262 | vn_close(vnode_t *vp, int flags, int x1, int x2, void *x3, void *x4) |
4b171585 | 263 | { |
264 | int rc; | |
265 | ||
937879f1 | 266 | ASSERT(vp); |
267 | ASSERT(vp->v_file); | |
4b171585 | 268 | |
4be55565 | 269 | mapping_set_gfp_mask(vp->v_file->f_mapping, vp->v_gfp_mask); |
97735c39 BB |
270 | rc = filp_close(vp->v_file, 0); |
271 | vn_free(vp); | |
4b171585 | 272 | |
10946b02 | 273 | return (-rc); |
4b171585 | 274 | } /* vn_close() */ |
275 | EXPORT_SYMBOL(vn_close); | |
276 | ||
97735c39 BB |
277 | /* vn_seek() does not actually seek it only performs bounds checking on the |
278 | * proposed seek. We perform minimal checking and allow vn_rdwr() to catch | |
279 | * anything more serious. */ | |
280 | int | |
47995fa6 | 281 | vn_seek(vnode_t *vp, offset_t ooff, offset_t *noffp, void *ct) |
97735c39 BB |
282 | { |
283 | return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0); | |
284 | } | |
285 | EXPORT_SYMBOL(vn_seek); | |
286 | ||
10946b02 AX |
287 | /* |
288 | * spl_basename() takes a NULL-terminated string s as input containing a path. | |
289 | * It returns a char pointer to a string and a length that describe the | |
290 | * basename of the path. If the basename is not "." or "/", it will be an index | |
291 | * into the string. While the string should be NULL terminated, the section | |
292 | * referring to the basename is not. spl_basename is dual-licensed GPLv2+ and | |
293 | * CC0. Anyone wishing to reuse it in another codebase may pick either license. | |
294 | */ | |
295 | static void | |
296 | spl_basename(const char *s, const char **str, int *len) | |
297 | { | |
298 | size_t i, end; | |
299 | ||
300 | ASSERT(str); | |
301 | ASSERT(len); | |
302 | ||
303 | if (!s || !*s) { | |
304 | *str = "."; | |
305 | *len = 1; | |
306 | return; | |
307 | } | |
308 | ||
309 | i = strlen(s) - 1; | |
310 | ||
311 | while (i && s[i--] == '/'); | |
312 | ||
313 | if (i == 0) { | |
314 | *str = "/"; | |
315 | *len = 1; | |
316 | return; | |
317 | } | |
318 | ||
319 | end = i; | |
320 | ||
321 | for (end = i; i; i--) { | |
322 | if (s[i] == '/') { | |
323 | *str = &s[i+1]; | |
324 | *len = end - i + 1; | |
325 | return; | |
326 | } | |
327 | } | |
328 | ||
329 | *str = s; | |
330 | *len = end + 1; | |
331 | } | |
332 | ||
333 | static struct dentry * | |
334 | spl_kern_path_locked(const char *name, struct path *path) | |
335 | { | |
336 | struct path parent; | |
337 | struct dentry *dentry; | |
338 | const char *basename; | |
339 | int len; | |
340 | int rc; | |
341 | ||
342 | ASSERT(name); | |
343 | ASSERT(path); | |
344 | ||
345 | spl_basename(name, &basename, &len); | |
346 | ||
347 | /* We do not accept "." or ".." */ | |
348 | if (len <= 2 && basename[0] == '.') | |
349 | if (len == 1 || basename[1] == '.') | |
350 | return (ERR_PTR(-EACCES)); | |
351 | ||
352 | rc = kern_path(name, LOOKUP_PARENT, &parent); | |
353 | if (rc) | |
354 | return (ERR_PTR(rc)); | |
355 | ||
356 | spl_inode_lock(parent.dentry->d_inode); | |
357 | ||
358 | dentry = lookup_one_len(basename, parent.dentry, len); | |
359 | if (IS_ERR(dentry)) { | |
360 | spl_inode_unlock(parent.dentry->d_inode); | |
361 | path_put(&parent); | |
362 | } else { | |
363 | *path = parent; | |
364 | } | |
365 | ||
366 | return (dentry); | |
367 | } | |
368 | ||
bcb15891 YS |
369 | /* Based on do_unlinkat() from linux/fs/namei.c */ |
370 | int | |
371 | vn_remove(const char *path, uio_seg_t seg, int flags) | |
372 | { | |
373 | struct dentry *dentry; | |
374 | struct path parent; | |
375 | struct inode *inode = NULL; | |
376 | int rc = 0; | |
bcb15891 YS |
377 | |
378 | ASSERT(seg == UIO_SYSSPACE); | |
379 | ASSERT(flags == RMFILE); | |
380 | ||
381 | dentry = spl_kern_path_locked(path, &parent); | |
382 | rc = PTR_ERR(dentry); | |
383 | if (!IS_ERR(dentry)) { | |
10946b02 AX |
384 | if (parent.dentry->d_name.name[parent.dentry->d_name.len]) { |
385 | rc = 0; | |
386 | goto slashes; | |
387 | } | |
bcb15891 YS |
388 | |
389 | inode = dentry->d_inode; | |
10946b02 AX |
390 | if (inode) { |
391 | atomic_inc(&inode->i_count); | |
392 | } else { | |
393 | rc = 0; | |
394 | goto slashes; | |
395 | } | |
bcb15891 | 396 | |
33a20369 | 397 | #ifdef HAVE_2ARGS_VFS_UNLINK |
bcb15891 | 398 | rc = vfs_unlink(parent.dentry->d_inode, dentry); |
33a20369 LG |
399 | #else |
400 | rc = vfs_unlink(parent.dentry->d_inode, dentry, NULL); | |
401 | #endif /* HAVE_2ARGS_VFS_UNLINK */ | |
bcb15891 YS |
402 | exit1: |
403 | dput(dentry); | |
053678f3 BB |
404 | } else { |
405 | return (-rc); | |
bcb15891 YS |
406 | } |
407 | ||
408 | spl_inode_unlock(parent.dentry->d_inode); | |
409 | if (inode) | |
410 | iput(inode); /* truncate the inode here */ | |
411 | ||
412 | path_put(&parent); | |
10946b02 | 413 | return (-rc); |
bcb15891 YS |
414 | |
415 | slashes: | |
416 | rc = !dentry->d_inode ? -ENOENT : | |
417 | S_ISDIR(dentry->d_inode->i_mode) ? -EISDIR : -ENOTDIR; | |
10946b02 | 418 | goto exit1; |
bcb15891 YS |
419 | } /* vn_remove() */ |
420 | EXPORT_SYMBOL(vn_remove); | |
421 | ||
422 | /* Based on do_rename() from linux/fs/namei.c */ | |
423 | int | |
424 | vn_rename(const char *oldname, const char *newname, int x1) | |
425 | { | |
426 | struct dentry *old_dir, *new_dir; | |
427 | struct dentry *old_dentry, *new_dentry; | |
428 | struct dentry *trap; | |
429 | struct path old_parent, new_parent; | |
430 | int rc = 0; | |
bcb15891 YS |
431 | |
432 | old_dentry = spl_kern_path_locked(oldname, &old_parent); | |
10946b02 AX |
433 | if (IS_ERR(old_dentry)) { |
434 | rc = PTR_ERR(old_dentry); | |
435 | goto exit; | |
436 | } | |
bcb15891 YS |
437 | |
438 | spl_inode_unlock(old_parent.dentry->d_inode); | |
439 | ||
440 | new_dentry = spl_kern_path_locked(newname, &new_parent); | |
10946b02 AX |
441 | if (IS_ERR(new_dentry)) { |
442 | rc = PTR_ERR(new_dentry); | |
443 | goto exit2; | |
444 | } | |
bcb15891 YS |
445 | |
446 | spl_inode_unlock(new_parent.dentry->d_inode); | |
447 | ||
448 | rc = -EXDEV; | |
449 | if (old_parent.mnt != new_parent.mnt) | |
10946b02 | 450 | goto exit3; |
bcb15891 YS |
451 | |
452 | old_dir = old_parent.dentry; | |
453 | new_dir = new_parent.dentry; | |
454 | trap = lock_rename(new_dir, old_dir); | |
455 | ||
456 | /* source should not be ancestor of target */ | |
457 | rc = -EINVAL; | |
458 | if (old_dentry == trap) | |
10946b02 | 459 | goto exit4; |
bcb15891 YS |
460 | |
461 | /* target should not be an ancestor of source */ | |
462 | rc = -ENOTEMPTY; | |
463 | if (new_dentry == trap) | |
10946b02 | 464 | goto exit4; |
bcb15891 YS |
465 | |
466 | /* source must exist */ | |
467 | rc = -ENOENT; | |
468 | if (!old_dentry->d_inode) | |
10946b02 | 469 | goto exit4; |
bcb15891 YS |
470 | |
471 | /* unless the source is a directory trailing slashes give -ENOTDIR */ | |
472 | if (!S_ISDIR(old_dentry->d_inode->i_mode)) { | |
473 | rc = -ENOTDIR; | |
474 | if (old_dentry->d_name.name[old_dentry->d_name.len]) | |
10946b02 | 475 | goto exit4; |
bcb15891 | 476 | if (new_dentry->d_name.name[new_dentry->d_name.len]) |
10946b02 | 477 | goto exit4; |
bcb15891 YS |
478 | } |
479 | ||
9e4fb5c2 | 480 | #if defined(HAVE_4ARGS_VFS_RENAME) |
bcb15891 | 481 | rc = vfs_rename(old_dir->d_inode, old_dentry, |
33a20369 | 482 | new_dir->d_inode, new_dentry); |
9e4fb5c2 | 483 | #elif defined(HAVE_5ARGS_VFS_RENAME) |
33a20369 LG |
484 | rc = vfs_rename(old_dir->d_inode, old_dentry, |
485 | new_dir->d_inode, new_dentry, NULL); | |
9e4fb5c2 LG |
486 | #else |
487 | rc = vfs_rename(old_dir->d_inode, old_dentry, | |
488 | new_dir->d_inode, new_dentry, NULL, 0); | |
489 | #endif | |
bcb15891 YS |
490 | exit4: |
491 | unlock_rename(new_dir, old_dir); | |
492 | exit3: | |
493 | dput(new_dentry); | |
494 | path_put(&new_parent); | |
495 | exit2: | |
496 | dput(old_dentry); | |
497 | path_put(&old_parent); | |
498 | exit: | |
10946b02 | 499 | return (-rc); |
0b3cf046 | 500 | } |
4b171585 | 501 | EXPORT_SYMBOL(vn_rename); |
0b3cf046 | 502 | |
4b171585 | 503 | int |
36e6f861 | 504 | vn_getattr(vnode_t *vp, vattr_t *vap, int flags, void *x3, void *x4) |
0b3cf046 | 505 | { |
4b171585 | 506 | struct file *fp; |
dcd9cb5a | 507 | struct kstat stat; |
4b171585 | 508 | int rc; |
509 | ||
937879f1 | 510 | ASSERT(vp); |
511 | ASSERT(vp->v_file); | |
512 | ASSERT(vap); | |
4b171585 | 513 | |
e4f1d29f | 514 | fp = vp->v_file; |
4b171585 | 515 | |
2a305c34 RY |
516 | #ifdef HAVE_2ARGS_VFS_GETATTR |
517 | rc = vfs_getattr(&fp->f_path, &stat); | |
518 | #else | |
519 | rc = vfs_getattr(fp->f_path.mnt, fp->f_dentry, &stat); | |
520 | #endif | |
4b171585 | 521 | if (rc) |
10946b02 | 522 | return (-rc); |
4b171585 | 523 | |
4295b530 | 524 | vap->va_type = vn_mode_to_vtype(stat.mode); |
4b171585 | 525 | vap->va_mode = stat.mode; |
80093b6f AX |
526 | vap->va_uid = KUID_TO_SUID(stat.uid); |
527 | vap->va_gid = KGID_TO_SGID(stat.gid); | |
4b171585 | 528 | vap->va_fsid = 0; |
529 | vap->va_nodeid = stat.ino; | |
530 | vap->va_nlink = stat.nlink; | |
531 | vap->va_size = stat.size; | |
47995fa6 | 532 | vap->va_blksize = stat.blksize; |
dcd9cb5a BB |
533 | vap->va_atime = stat.atime; |
534 | vap->va_mtime = stat.mtime; | |
535 | vap->va_ctime = stat.ctime; | |
4b171585 | 536 | vap->va_rdev = stat.rdev; |
dcd9cb5a | 537 | vap->va_nblocks = stat.blocks; |
4b171585 | 538 | |
10946b02 | 539 | return (0); |
0b3cf046 | 540 | } |
4b171585 | 541 | EXPORT_SYMBOL(vn_getattr); |
542 | ||
2f5d55aa | 543 | int vn_fsync(vnode_t *vp, int flags, void *x3, void *x4) |
4b171585 | 544 | { |
36e6f861 | 545 | int datasync = 0; |
10946b02 AX |
546 | int error; |
547 | int fstrans; | |
36e6f861 | 548 | |
937879f1 | 549 | ASSERT(vp); |
550 | ASSERT(vp->v_file); | |
4b171585 | 551 | |
36e6f861 | 552 | if (flags & FDSYNC) |
553 | datasync = 1; | |
554 | ||
10946b02 AX |
555 | /* |
556 | * May enter XFS which generates a warning when PF_FSTRANS is set. | |
557 | * To avoid this the flag is cleared over vfs_sync() and then reset. | |
558 | */ | |
559 | fstrans = spl_fstrans_check(); | |
560 | if (fstrans) | |
561 | current->flags &= ~(PF_FSTRANS); | |
562 | ||
563 | error = -spl_filp_fsync(vp->v_file, datasync); | |
564 | if (fstrans) | |
565 | current->flags |= PF_FSTRANS; | |
566 | ||
567 | return (error); | |
4b171585 | 568 | } /* vn_fsync() */ |
569 | EXPORT_SYMBOL(vn_fsync); | |
af828292 | 570 | |
bbdc6ae4 ED |
571 | int vn_space(vnode_t *vp, int cmd, struct flock *bfp, int flag, |
572 | offset_t offset, void *x6, void *x7) | |
573 | { | |
574 | int error = EOPNOTSUPP; | |
bbdc6ae4 ED |
575 | |
576 | if (cmd != F_FREESP || bfp->l_whence != 0) | |
10946b02 | 577 | return (EOPNOTSUPP); |
bbdc6ae4 ED |
578 | |
579 | ASSERT(vp); | |
580 | ASSERT(vp->v_file); | |
581 | ASSERT(bfp->l_start >= 0 && bfp->l_len > 0); | |
582 | ||
583 | #ifdef FALLOC_FL_PUNCH_HOLE | |
1c7b3eaf BB |
584 | /* |
585 | * When supported by the underlying file system preferentially | |
586 | * use the fallocate() callback to preallocate the space. | |
587 | */ | |
588 | error = -spl_filp_fallocate(vp->v_file, | |
589 | FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE, | |
590 | bfp->l_start, bfp->l_len); | |
591 | if (error == 0) | |
10946b02 | 592 | return (0); |
bbdc6ae4 ED |
593 | #endif |
594 | ||
595 | #ifdef HAVE_INODE_TRUNCATE_RANGE | |
596 | if (vp->v_file->f_dentry && vp->v_file->f_dentry->d_inode && | |
597 | vp->v_file->f_dentry->d_inode->i_op && | |
598 | vp->v_file->f_dentry->d_inode->i_op->truncate_range) { | |
599 | off_t end = bfp->l_start + bfp->l_len; | |
600 | /* | |
601 | * Judging from the code in shmem_truncate_range(), | |
602 | * it seems the kernel expects the end offset to be | |
603 | * inclusive and aligned to the end of a page. | |
604 | */ | |
605 | if (end % PAGE_SIZE != 0) { | |
606 | end &= ~(off_t)(PAGE_SIZE - 1); | |
607 | if (end <= bfp->l_start) | |
10946b02 | 608 | return (0); |
bbdc6ae4 ED |
609 | } |
610 | --end; | |
611 | ||
612 | vp->v_file->f_dentry->d_inode->i_op->truncate_range( | |
613 | vp->v_file->f_dentry->d_inode, | |
614 | bfp->l_start, end | |
615 | ); | |
10946b02 | 616 | return (0); |
bbdc6ae4 ED |
617 | } |
618 | #endif | |
619 | ||
10946b02 | 620 | return (error); |
bbdc6ae4 ED |
621 | } |
622 | EXPORT_SYMBOL(vn_space); | |
623 | ||
e4f1d29f | 624 | /* Function must be called while holding the vn_file_lock */ |
625 | static file_t * | |
626 | file_find(int fd) | |
627 | { | |
628 | file_t *fp; | |
629 | ||
937879f1 | 630 | ASSERT(spin_is_locked(&vn_file_lock)); |
e4f1d29f | 631 | |
632 | list_for_each_entry(fp, &vn_file_list, f_list) { | |
763b2f3b | 633 | if (fd == fp->f_fd && fp->f_task == current) { |
937879f1 | 634 | ASSERT(atomic_read(&fp->f_ref) != 0); |
e4f1d29f | 635 | return fp; |
636 | } | |
637 | } | |
638 | ||
639 | return NULL; | |
640 | } /* file_find() */ | |
641 | ||
642 | file_t * | |
643 | vn_getf(int fd) | |
644 | { | |
645 | struct kstat stat; | |
646 | struct file *lfp; | |
647 | file_t *fp; | |
648 | vnode_t *vp; | |
937879f1 | 649 | int rc = 0; |
e4f1d29f | 650 | |
651 | /* Already open just take an extra reference */ | |
652 | spin_lock(&vn_file_lock); | |
653 | ||
654 | fp = file_find(fd); | |
655 | if (fp) { | |
656 | atomic_inc(&fp->f_ref); | |
657 | spin_unlock(&vn_file_lock); | |
10946b02 | 658 | return (fp); |
e4f1d29f | 659 | } |
660 | ||
661 | spin_unlock(&vn_file_lock); | |
662 | ||
663 | /* File was not yet opened create the object and setup */ | |
4afaaefa | 664 | fp = kmem_cache_alloc(vn_file_cache, KM_SLEEP); |
e4f1d29f | 665 | if (fp == NULL) |
10946b02 | 666 | goto out; |
e4f1d29f | 667 | |
668 | mutex_enter(&fp->f_lock); | |
669 | ||
670 | fp->f_fd = fd; | |
763b2f3b | 671 | fp->f_task = current; |
e4f1d29f | 672 | fp->f_offset = 0; |
673 | atomic_inc(&fp->f_ref); | |
674 | ||
675 | lfp = fget(fd); | |
676 | if (lfp == NULL) | |
10946b02 | 677 | goto out_mutex; |
e4f1d29f | 678 | |
679 | vp = vn_alloc(KM_SLEEP); | |
680 | if (vp == NULL) | |
10946b02 | 681 | goto out_fget; |
e4f1d29f | 682 | |
2a305c34 RY |
683 | #ifdef HAVE_2ARGS_VFS_GETATTR |
684 | rc = vfs_getattr(&lfp->f_path, &stat); | |
685 | #else | |
686 | rc = vfs_getattr(lfp->f_path.mnt, lfp->f_dentry, &stat); | |
687 | #endif | |
688 | if (rc) | |
10946b02 | 689 | goto out_vnode; |
e4f1d29f | 690 | |
691 | mutex_enter(&vp->v_lock); | |
4295b530 | 692 | vp->v_type = vn_mode_to_vtype(stat.mode); |
e4f1d29f | 693 | vp->v_file = lfp; |
694 | mutex_exit(&vp->v_lock); | |
695 | ||
696 | fp->f_vnode = vp; | |
697 | fp->f_file = lfp; | |
698 | ||
699 | /* Put it on the tracking list */ | |
700 | spin_lock(&vn_file_lock); | |
701 | list_add(&fp->f_list, &vn_file_list); | |
702 | spin_unlock(&vn_file_lock); | |
703 | ||
704 | mutex_exit(&fp->f_lock); | |
10946b02 | 705 | return (fp); |
e4f1d29f | 706 | |
707 | out_vnode: | |
e4f1d29f | 708 | vn_free(vp); |
709 | out_fget: | |
e4f1d29f | 710 | fput(lfp); |
711 | out_mutex: | |
e4f1d29f | 712 | mutex_exit(&fp->f_lock); |
713 | kmem_cache_free(vn_file_cache, fp); | |
714 | out: | |
10946b02 | 715 | return (NULL); |
e4f1d29f | 716 | } /* getf() */ |
717 | EXPORT_SYMBOL(getf); | |
718 | ||
719 | static void releasef_locked(file_t *fp) | |
720 | { | |
937879f1 | 721 | ASSERT(fp->f_file); |
722 | ASSERT(fp->f_vnode); | |
e4f1d29f | 723 | |
724 | /* Unlinked from list, no refs, safe to free outside mutex */ | |
725 | fput(fp->f_file); | |
726 | vn_free(fp->f_vnode); | |
727 | ||
728 | kmem_cache_free(vn_file_cache, fp); | |
729 | } | |
730 | ||
731 | void | |
732 | vn_releasef(int fd) | |
733 | { | |
734 | file_t *fp; | |
735 | ||
736 | spin_lock(&vn_file_lock); | |
737 | fp = file_find(fd); | |
738 | if (fp) { | |
739 | atomic_dec(&fp->f_ref); | |
740 | if (atomic_read(&fp->f_ref) > 0) { | |
741 | spin_unlock(&vn_file_lock); | |
742 | return; | |
743 | } | |
744 | ||
745 | list_del(&fp->f_list); | |
746 | releasef_locked(fp); | |
747 | } | |
748 | spin_unlock(&vn_file_lock); | |
749 | ||
750 | return; | |
751 | } /* releasef() */ | |
752 | EXPORT_SYMBOL(releasef); | |
753 | ||
10946b02 AX |
754 | static void |
755 | #ifdef HAVE_SET_FS_PWD_WITH_CONST | |
756 | vn_set_fs_pwd(struct fs_struct *fs, const struct path *path) | |
757 | #else | |
758 | vn_set_fs_pwd(struct fs_struct *fs, struct path *path) | |
759 | #endif /* HAVE_SET_FS_PWD_WITH_CONST */ | |
51a727e9 | 760 | { |
9b2048c2 BB |
761 | struct path old_pwd; |
762 | ||
10946b02 | 763 | #ifdef HAVE_FS_STRUCT_SPINLOCK |
9b2048c2 BB |
764 | spin_lock(&fs->lock); |
765 | old_pwd = fs->pwd; | |
766 | fs->pwd = *path; | |
767 | path_get(path); | |
768 | spin_unlock(&fs->lock); | |
10946b02 | 769 | #else |
9b2048c2 BB |
770 | write_lock(&fs->lock); |
771 | old_pwd = fs->pwd; | |
772 | fs->pwd = *path; | |
773 | path_get(path); | |
774 | write_unlock(&fs->lock); | |
10946b02 | 775 | #endif /* HAVE_FS_STRUCT_SPINLOCK */ |
9b2048c2 BB |
776 | |
777 | if (old_pwd.dentry) | |
778 | path_put(&old_pwd); | |
51a727e9 | 779 | } |
51a727e9 BB |
780 | |
781 | int | |
782 | vn_set_pwd(const char *filename) | |
783 | { | |
51a727e9 | 784 | struct path path; |
82a358d9 | 785 | mm_segment_t saved_fs; |
51a727e9 | 786 | int rc; |
51a727e9 | 787 | |
82a358d9 BB |
788 | /* |
789 | * user_path_dir() and __user_walk() both expect 'filename' to be | |
790 | * a user space address so we must briefly increase the data segment | |
791 | * size to ensure strncpy_from_user() does not fail with -EFAULT. | |
792 | */ | |
793 | saved_fs = get_fs(); | |
794 | set_fs(get_ds()); | |
795 | ||
51a727e9 BB |
796 | rc = user_path_dir(filename, &path); |
797 | if (rc) | |
10946b02 | 798 | goto out; |
51a727e9 BB |
799 | |
800 | rc = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS); | |
801 | if (rc) | |
10946b02 | 802 | goto dput_and_out; |
51a727e9 | 803 | |
10946b02 | 804 | vn_set_fs_pwd(current->fs, &path); |
51a727e9 BB |
805 | |
806 | dput_and_out: | |
807 | path_put(&path); | |
51a727e9 | 808 | out: |
82a358d9 BB |
809 | set_fs(saved_fs); |
810 | ||
10946b02 | 811 | return (-rc); |
51a727e9 BB |
812 | } /* vn_set_pwd() */ |
813 | EXPORT_SYMBOL(vn_set_pwd); | |
814 | ||
af828292 | 815 | static int |
816 | vn_cache_constructor(void *buf, void *cdrarg, int kmflags) | |
817 | { | |
818 | struct vnode *vp = buf; | |
819 | ||
820 | mutex_init(&vp->v_lock, NULL, MUTEX_DEFAULT, NULL); | |
821 | ||
822 | return (0); | |
823 | } /* vn_cache_constructor() */ | |
824 | ||
825 | static void | |
826 | vn_cache_destructor(void *buf, void *cdrarg) | |
827 | { | |
828 | struct vnode *vp = buf; | |
829 | ||
830 | mutex_destroy(&vp->v_lock); | |
831 | } /* vn_cache_destructor() */ | |
832 | ||
e4f1d29f | 833 | static int |
834 | vn_file_cache_constructor(void *buf, void *cdrarg, int kmflags) | |
835 | { | |
836 | file_t *fp = buf; | |
837 | ||
838 | atomic_set(&fp->f_ref, 0); | |
839 | mutex_init(&fp->f_lock, NULL, MUTEX_DEFAULT, NULL); | |
4e62fd41 | 840 | INIT_LIST_HEAD(&fp->f_list); |
e4f1d29f | 841 | |
842 | return (0); | |
843 | } /* file_cache_constructor() */ | |
844 | ||
845 | static void | |
846 | vn_file_cache_destructor(void *buf, void *cdrarg) | |
847 | { | |
848 | file_t *fp = buf; | |
849 | ||
850 | mutex_destroy(&fp->f_lock); | |
851 | } /* vn_file_cache_destructor() */ | |
852 | ||
af828292 | 853 | int |
12ff95ff | 854 | spl_vn_init(void) |
af828292 | 855 | { |
57d86234 | 856 | vn_cache = kmem_cache_create("spl_vn_cache", |
857 | sizeof(struct vnode), 64, | |
5d86345d | 858 | vn_cache_constructor, |
859 | vn_cache_destructor, | |
a5b40eed | 860 | NULL, NULL, NULL, KMC_KMEM); |
e4f1d29f | 861 | |
862 | vn_file_cache = kmem_cache_create("spl_vn_file_cache", | |
863 | sizeof(file_t), 64, | |
864 | vn_file_cache_constructor, | |
865 | vn_file_cache_destructor, | |
a5b40eed | 866 | NULL, NULL, NULL, KMC_KMEM); |
10946b02 | 867 | return (0); |
af828292 | 868 | } /* vn_init() */ |
869 | ||
870 | void | |
12ff95ff | 871 | spl_vn_fini(void) |
af828292 | 872 | { |
e4f1d29f | 873 | file_t *fp, *next_fp; |
2fb9b26a | 874 | int leaked = 0; |
e4f1d29f | 875 | |
876 | spin_lock(&vn_file_lock); | |
877 | ||
878 | list_for_each_entry_safe(fp, next_fp, &vn_file_list, f_list) { | |
879 | list_del(&fp->f_list); | |
880 | releasef_locked(fp); | |
881 | leaked++; | |
882 | } | |
883 | ||
e4f1d29f | 884 | spin_unlock(&vn_file_lock); |
885 | ||
886 | if (leaked > 0) | |
10946b02 | 887 | printk(KERN_WARNING "WARNING: %d vnode files leaked\n", leaked); |
e4f1d29f | 888 | |
2371321e | 889 | kmem_cache_destroy(vn_file_cache); |
2fb9b26a | 890 | kmem_cache_destroy(vn_cache); |
e4f1d29f | 891 | |
892 | return; | |
af828292 | 893 | } /* vn_fini() */ |