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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 | ||
4b171585 | 66 | return VNON; |
4295b530 BB |
67 | } /* vn_mode_to_vtype() */ |
68 | EXPORT_SYMBOL(vn_mode_to_vtype); | |
69 | ||
70 | mode_t | |
71 | vn_vtype_to_mode(vtype_t vtype) | |
72 | { | |
73 | if (vtype == VREG) | |
74 | return S_IFREG; | |
75 | ||
76 | if (vtype == VDIR) | |
77 | return S_IFDIR; | |
78 | ||
79 | if (vtype == VCHR) | |
80 | return S_IFCHR; | |
81 | ||
82 | if (vtype == VBLK) | |
83 | return S_IFBLK; | |
84 | ||
85 | if (vtype == VFIFO) | |
86 | return S_IFIFO; | |
87 | ||
88 | if (vtype == VLNK) | |
89 | return S_IFLNK; | |
90 | ||
91 | if (vtype == VSOCK) | |
92 | return S_IFSOCK; | |
93 | ||
94 | return VNON; | |
95 | } /* vn_vtype_to_mode() */ | |
96 | EXPORT_SYMBOL(vn_vtype_to_mode); | |
4b171585 | 97 | |
af828292 | 98 | vnode_t * |
99 | vn_alloc(int flag) | |
100 | { | |
101 | vnode_t *vp; | |
102 | ||
103 | vp = kmem_cache_alloc(vn_cache, flag); | |
af828292 | 104 | if (vp != NULL) { |
e4f1d29f | 105 | vp->v_file = NULL; |
af828292 | 106 | vp->v_type = 0; |
107 | } | |
108 | ||
10946b02 | 109 | return (vp); |
af828292 | 110 | } /* vn_alloc() */ |
111 | EXPORT_SYMBOL(vn_alloc); | |
112 | ||
113 | void | |
114 | vn_free(vnode_t *vp) | |
115 | { | |
116 | kmem_cache_free(vn_cache, vp); | |
117 | } /* vn_free() */ | |
118 | EXPORT_SYMBOL(vn_free); | |
119 | ||
0b3cf046 | 120 | int |
af828292 | 121 | vn_open(const char *path, uio_seg_t seg, int flags, int mode, |
4b171585 | 122 | vnode_t **vpp, int x1, void *x2) |
0b3cf046 | 123 | { |
f7e8739c RC |
124 | struct file *fp; |
125 | struct kstat stat; | |
126 | int rc, saved_umask = 0; | |
4be55565 | 127 | gfp_t saved_gfp; |
0b3cf046 | 128 | vnode_t *vp; |
0b3cf046 | 129 | |
937879f1 | 130 | ASSERT(flags & (FWRITE | FREAD)); |
131 | ASSERT(seg == UIO_SYSSPACE); | |
132 | ASSERT(vpp); | |
4b171585 | 133 | *vpp = NULL; |
134 | ||
135 | if (!(flags & FCREAT) && (flags & FWRITE)) | |
136 | flags |= FEXCL; | |
137 | ||
728b9dd8 | 138 | /* Note for filp_open() the two low bits must be remapped to mean: |
139 | * 01 - read-only -> 00 read-only | |
140 | * 10 - write-only -> 01 write-only | |
141 | * 11 - read-write -> 10 read-write | |
142 | */ | |
143 | flags--; | |
0b3cf046 | 144 | |
145 | if (flags & FCREAT) | |
4b171585 | 146 | saved_umask = xchg(¤t->fs->umask, 0); |
0b3cf046 | 147 | |
f7e8739c | 148 | fp = filp_open(path, flags, mode); |
0b3cf046 | 149 | |
150 | if (flags & FCREAT) | |
4b171585 | 151 | (void)xchg(¤t->fs->umask, saved_umask); |
0b3cf046 | 152 | |
f7e8739c | 153 | if (IS_ERR(fp)) |
10946b02 | 154 | return (-PTR_ERR(fp)); |
0b3cf046 | 155 | |
2ea56c1d AX |
156 | #if defined(HAVE_4ARGS_VFS_GETATTR) |
157 | rc = vfs_getattr(&fp->f_path, &stat, STATX_TYPE, AT_STATX_SYNC_AS_STAT); | |
158 | #elif defined(HAVE_2ARGS_VFS_GETATTR) | |
2a305c34 RY |
159 | rc = vfs_getattr(&fp->f_path, &stat); |
160 | #else | |
bc90df66 | 161 | rc = vfs_getattr(fp->f_path.mnt, fp->f_dentry, &stat); |
2a305c34 | 162 | #endif |
4b171585 | 163 | if (rc) { |
164 | filp_close(fp, 0); | |
10946b02 | 165 | return (-rc); |
0b3cf046 | 166 | } |
167 | ||
af828292 | 168 | vp = vn_alloc(KM_SLEEP); |
4b171585 | 169 | if (!vp) { |
170 | filp_close(fp, 0); | |
10946b02 | 171 | return (ENOMEM); |
4b171585 | 172 | } |
0b3cf046 | 173 | |
4be55565 LW |
174 | saved_gfp = mapping_gfp_mask(fp->f_mapping); |
175 | mapping_set_gfp_mask(fp->f_mapping, saved_gfp & ~(__GFP_IO|__GFP_FS)); | |
176 | ||
e4f1d29f | 177 | mutex_enter(&vp->v_lock); |
4295b530 | 178 | vp->v_type = vn_mode_to_vtype(stat.mode); |
e4f1d29f | 179 | vp->v_file = fp; |
4be55565 | 180 | vp->v_gfp_mask = saved_gfp; |
4b171585 | 181 | *vpp = vp; |
e4f1d29f | 182 | mutex_exit(&vp->v_lock); |
0b3cf046 | 183 | |
10946b02 | 184 | return (0); |
4b171585 | 185 | } /* vn_open() */ |
186 | EXPORT_SYMBOL(vn_open); | |
0b3cf046 | 187 | |
0b3cf046 | 188 | int |
af828292 | 189 | vn_openat(const char *path, uio_seg_t seg, int flags, int mode, |
4b171585 | 190 | vnode_t **vpp, int x1, void *x2, vnode_t *vp, int fd) |
0b3cf046 | 191 | { |
4b171585 | 192 | char *realpath; |
12018327 | 193 | int len, rc; |
0b3cf046 | 194 | |
937879f1 | 195 | ASSERT(vp == rootdir); |
0b3cf046 | 196 | |
12018327 | 197 | len = strlen(path) + 2; |
10946b02 | 198 | realpath = kmalloc(len, kmem_flags_convert(KM_SLEEP)); |
4b171585 | 199 | if (!realpath) |
10946b02 | 200 | return (ENOMEM); |
0b3cf046 | 201 | |
12018327 | 202 | (void)snprintf(realpath, len, "/%s", path); |
4b171585 | 203 | rc = vn_open(realpath, seg, flags, mode, vpp, x1, x2); |
4b171585 | 204 | kfree(realpath); |
205 | ||
10946b02 | 206 | return (rc); |
4b171585 | 207 | } /* vn_openat() */ |
208 | EXPORT_SYMBOL(vn_openat); | |
0b3cf046 | 209 | |
0b3cf046 | 210 | int |
4b171585 | 211 | vn_rdwr(uio_rw_t uio, vnode_t *vp, void *addr, ssize_t len, offset_t off, |
663e02a1 | 212 | uio_seg_t seg, int ioflag, rlim64_t x2, void *x3, ssize_t *residp) |
0b3cf046 | 213 | { |
99d6d8dc AX |
214 | struct file *fp = vp->v_file; |
215 | loff_t offset = off; | |
4b171585 | 216 | int rc; |
217 | ||
937879f1 | 218 | ASSERT(uio == UIO_WRITE || uio == UIO_READ); |
937879f1 | 219 | ASSERT(seg == UIO_SYSSPACE); |
663e02a1 | 220 | ASSERT((ioflag & ~FAPPEND) == 0); |
4b171585 | 221 | |
663e02a1 RC |
222 | if (ioflag & FAPPEND) |
223 | offset = fp->f_pos; | |
224 | ||
4b171585 | 225 | if (uio & UIO_WRITE) |
99d6d8dc | 226 | rc = spl_kernel_write(fp, addr, len, &offset); |
4b171585 | 227 | else |
99d6d8dc | 228 | rc = spl_kernel_read(fp, addr, len, &offset); |
4b171585 | 229 | |
f3989ed3 | 230 | fp->f_pos = offset; |
4b171585 | 231 | |
232 | if (rc < 0) | |
10946b02 | 233 | return (-rc); |
0b3cf046 | 234 | |
4b171585 | 235 | if (residp) { |
236 | *residp = len - rc; | |
0b3cf046 | 237 | } else { |
4b171585 | 238 | if (rc != len) |
10946b02 | 239 | return (EIO); |
0b3cf046 | 240 | } |
241 | ||
10946b02 | 242 | return (0); |
4b171585 | 243 | } /* vn_rdwr() */ |
244 | EXPORT_SYMBOL(vn_rdwr); | |
245 | ||
246 | int | |
2f5d55aa | 247 | vn_close(vnode_t *vp, int flags, int x1, int x2, void *x3, void *x4) |
4b171585 | 248 | { |
249 | int rc; | |
250 | ||
937879f1 | 251 | ASSERT(vp); |
252 | ASSERT(vp->v_file); | |
4b171585 | 253 | |
4be55565 | 254 | mapping_set_gfp_mask(vp->v_file->f_mapping, vp->v_gfp_mask); |
97735c39 BB |
255 | rc = filp_close(vp->v_file, 0); |
256 | vn_free(vp); | |
4b171585 | 257 | |
10946b02 | 258 | return (-rc); |
4b171585 | 259 | } /* vn_close() */ |
260 | EXPORT_SYMBOL(vn_close); | |
261 | ||
97735c39 BB |
262 | /* vn_seek() does not actually seek it only performs bounds checking on the |
263 | * proposed seek. We perform minimal checking and allow vn_rdwr() to catch | |
264 | * anything more serious. */ | |
265 | int | |
47995fa6 | 266 | vn_seek(vnode_t *vp, offset_t ooff, offset_t *noffp, void *ct) |
97735c39 BB |
267 | { |
268 | return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0); | |
269 | } | |
270 | EXPORT_SYMBOL(vn_seek); | |
271 | ||
10946b02 AX |
272 | /* |
273 | * spl_basename() takes a NULL-terminated string s as input containing a path. | |
274 | * It returns a char pointer to a string and a length that describe the | |
275 | * basename of the path. If the basename is not "." or "/", it will be an index | |
276 | * into the string. While the string should be NULL terminated, the section | |
277 | * referring to the basename is not. spl_basename is dual-licensed GPLv2+ and | |
278 | * CC0. Anyone wishing to reuse it in another codebase may pick either license. | |
279 | */ | |
280 | static void | |
281 | spl_basename(const char *s, const char **str, int *len) | |
282 | { | |
283 | size_t i, end; | |
284 | ||
285 | ASSERT(str); | |
286 | ASSERT(len); | |
287 | ||
288 | if (!s || !*s) { | |
289 | *str = "."; | |
290 | *len = 1; | |
291 | return; | |
292 | } | |
293 | ||
294 | i = strlen(s) - 1; | |
295 | ||
296 | while (i && s[i--] == '/'); | |
297 | ||
298 | if (i == 0) { | |
299 | *str = "/"; | |
300 | *len = 1; | |
301 | return; | |
302 | } | |
303 | ||
304 | end = i; | |
305 | ||
306 | for (end = i; i; i--) { | |
307 | if (s[i] == '/') { | |
308 | *str = &s[i+1]; | |
309 | *len = end - i + 1; | |
310 | return; | |
311 | } | |
312 | } | |
313 | ||
314 | *str = s; | |
315 | *len = end + 1; | |
316 | } | |
317 | ||
318 | static struct dentry * | |
319 | spl_kern_path_locked(const char *name, struct path *path) | |
320 | { | |
321 | struct path parent; | |
322 | struct dentry *dentry; | |
323 | const char *basename; | |
324 | int len; | |
325 | int rc; | |
326 | ||
327 | ASSERT(name); | |
328 | ASSERT(path); | |
329 | ||
330 | spl_basename(name, &basename, &len); | |
331 | ||
332 | /* We do not accept "." or ".." */ | |
333 | if (len <= 2 && basename[0] == '.') | |
334 | if (len == 1 || basename[1] == '.') | |
335 | return (ERR_PTR(-EACCES)); | |
336 | ||
337 | rc = kern_path(name, LOOKUP_PARENT, &parent); | |
338 | if (rc) | |
339 | return (ERR_PTR(rc)); | |
340 | ||
0f836a62 AX |
341 | /* use I_MUTEX_PARENT because vfs_unlink needs it */ |
342 | spl_inode_lock_nested(parent.dentry->d_inode, I_MUTEX_PARENT); | |
10946b02 AX |
343 | |
344 | dentry = lookup_one_len(basename, parent.dentry, len); | |
345 | if (IS_ERR(dentry)) { | |
346 | spl_inode_unlock(parent.dentry->d_inode); | |
347 | path_put(&parent); | |
348 | } else { | |
349 | *path = parent; | |
350 | } | |
351 | ||
352 | return (dentry); | |
353 | } | |
354 | ||
bcb15891 YS |
355 | /* Based on do_unlinkat() from linux/fs/namei.c */ |
356 | int | |
357 | vn_remove(const char *path, uio_seg_t seg, int flags) | |
358 | { | |
359 | struct dentry *dentry; | |
360 | struct path parent; | |
361 | struct inode *inode = NULL; | |
362 | int rc = 0; | |
bcb15891 YS |
363 | |
364 | ASSERT(seg == UIO_SYSSPACE); | |
365 | ASSERT(flags == RMFILE); | |
366 | ||
367 | dentry = spl_kern_path_locked(path, &parent); | |
368 | rc = PTR_ERR(dentry); | |
369 | if (!IS_ERR(dentry)) { | |
10946b02 AX |
370 | if (parent.dentry->d_name.name[parent.dentry->d_name.len]) { |
371 | rc = 0; | |
372 | goto slashes; | |
373 | } | |
bcb15891 YS |
374 | |
375 | inode = dentry->d_inode; | |
10946b02 AX |
376 | if (inode) { |
377 | atomic_inc(&inode->i_count); | |
378 | } else { | |
379 | rc = 0; | |
380 | goto slashes; | |
381 | } | |
bcb15891 | 382 | |
33a20369 | 383 | #ifdef HAVE_2ARGS_VFS_UNLINK |
bcb15891 | 384 | rc = vfs_unlink(parent.dentry->d_inode, dentry); |
33a20369 LG |
385 | #else |
386 | rc = vfs_unlink(parent.dentry->d_inode, dentry, NULL); | |
387 | #endif /* HAVE_2ARGS_VFS_UNLINK */ | |
bcb15891 YS |
388 | exit1: |
389 | dput(dentry); | |
053678f3 BB |
390 | } else { |
391 | return (-rc); | |
bcb15891 YS |
392 | } |
393 | ||
394 | spl_inode_unlock(parent.dentry->d_inode); | |
395 | if (inode) | |
396 | iput(inode); /* truncate the inode here */ | |
397 | ||
398 | path_put(&parent); | |
10946b02 | 399 | return (-rc); |
bcb15891 YS |
400 | |
401 | slashes: | |
402 | rc = !dentry->d_inode ? -ENOENT : | |
403 | S_ISDIR(dentry->d_inode->i_mode) ? -EISDIR : -ENOTDIR; | |
10946b02 | 404 | goto exit1; |
bcb15891 YS |
405 | } /* vn_remove() */ |
406 | EXPORT_SYMBOL(vn_remove); | |
407 | ||
408 | /* Based on do_rename() from linux/fs/namei.c */ | |
409 | int | |
410 | vn_rename(const char *oldname, const char *newname, int x1) | |
411 | { | |
412 | struct dentry *old_dir, *new_dir; | |
413 | struct dentry *old_dentry, *new_dentry; | |
414 | struct dentry *trap; | |
415 | struct path old_parent, new_parent; | |
416 | int rc = 0; | |
bcb15891 YS |
417 | |
418 | old_dentry = spl_kern_path_locked(oldname, &old_parent); | |
10946b02 AX |
419 | if (IS_ERR(old_dentry)) { |
420 | rc = PTR_ERR(old_dentry); | |
421 | goto exit; | |
422 | } | |
bcb15891 YS |
423 | |
424 | spl_inode_unlock(old_parent.dentry->d_inode); | |
425 | ||
426 | new_dentry = spl_kern_path_locked(newname, &new_parent); | |
10946b02 AX |
427 | if (IS_ERR(new_dentry)) { |
428 | rc = PTR_ERR(new_dentry); | |
429 | goto exit2; | |
430 | } | |
bcb15891 YS |
431 | |
432 | spl_inode_unlock(new_parent.dentry->d_inode); | |
433 | ||
434 | rc = -EXDEV; | |
435 | if (old_parent.mnt != new_parent.mnt) | |
10946b02 | 436 | goto exit3; |
bcb15891 YS |
437 | |
438 | old_dir = old_parent.dentry; | |
439 | new_dir = new_parent.dentry; | |
440 | trap = lock_rename(new_dir, old_dir); | |
441 | ||
442 | /* source should not be ancestor of target */ | |
443 | rc = -EINVAL; | |
444 | if (old_dentry == trap) | |
10946b02 | 445 | goto exit4; |
bcb15891 YS |
446 | |
447 | /* target should not be an ancestor of source */ | |
448 | rc = -ENOTEMPTY; | |
449 | if (new_dentry == trap) | |
10946b02 | 450 | goto exit4; |
bcb15891 YS |
451 | |
452 | /* source must exist */ | |
453 | rc = -ENOENT; | |
454 | if (!old_dentry->d_inode) | |
10946b02 | 455 | goto exit4; |
bcb15891 YS |
456 | |
457 | /* unless the source is a directory trailing slashes give -ENOTDIR */ | |
458 | if (!S_ISDIR(old_dentry->d_inode->i_mode)) { | |
459 | rc = -ENOTDIR; | |
460 | if (old_dentry->d_name.name[old_dentry->d_name.len]) | |
10946b02 | 461 | goto exit4; |
bcb15891 | 462 | if (new_dentry->d_name.name[new_dentry->d_name.len]) |
10946b02 | 463 | goto exit4; |
bcb15891 YS |
464 | } |
465 | ||
9e4fb5c2 | 466 | #if defined(HAVE_4ARGS_VFS_RENAME) |
bcb15891 | 467 | rc = vfs_rename(old_dir->d_inode, old_dentry, |
33a20369 | 468 | new_dir->d_inode, new_dentry); |
9e4fb5c2 | 469 | #elif defined(HAVE_5ARGS_VFS_RENAME) |
33a20369 LG |
470 | rc = vfs_rename(old_dir->d_inode, old_dentry, |
471 | new_dir->d_inode, new_dentry, NULL); | |
9e4fb5c2 LG |
472 | #else |
473 | rc = vfs_rename(old_dir->d_inode, old_dentry, | |
474 | new_dir->d_inode, new_dentry, NULL, 0); | |
475 | #endif | |
bcb15891 YS |
476 | exit4: |
477 | unlock_rename(new_dir, old_dir); | |
478 | exit3: | |
479 | dput(new_dentry); | |
480 | path_put(&new_parent); | |
481 | exit2: | |
482 | dput(old_dentry); | |
483 | path_put(&old_parent); | |
484 | exit: | |
10946b02 | 485 | return (-rc); |
0b3cf046 | 486 | } |
4b171585 | 487 | EXPORT_SYMBOL(vn_rename); |
0b3cf046 | 488 | |
4b171585 | 489 | int |
36e6f861 | 490 | vn_getattr(vnode_t *vp, vattr_t *vap, int flags, void *x3, void *x4) |
0b3cf046 | 491 | { |
4b171585 | 492 | struct file *fp; |
dcd9cb5a | 493 | struct kstat stat; |
4b171585 | 494 | int rc; |
495 | ||
937879f1 | 496 | ASSERT(vp); |
497 | ASSERT(vp->v_file); | |
498 | ASSERT(vap); | |
4b171585 | 499 | |
e4f1d29f | 500 | fp = vp->v_file; |
4b171585 | 501 | |
2ea56c1d AX |
502 | #if defined(HAVE_4ARGS_VFS_GETATTR) |
503 | rc = vfs_getattr(&fp->f_path, &stat, STATX_BASIC_STATS, | |
504 | AT_STATX_SYNC_AS_STAT); | |
505 | #elif defined(HAVE_2ARGS_VFS_GETATTR) | |
2a305c34 RY |
506 | rc = vfs_getattr(&fp->f_path, &stat); |
507 | #else | |
508 | rc = vfs_getattr(fp->f_path.mnt, fp->f_dentry, &stat); | |
509 | #endif | |
4b171585 | 510 | if (rc) |
10946b02 | 511 | return (-rc); |
4b171585 | 512 | |
4295b530 | 513 | vap->va_type = vn_mode_to_vtype(stat.mode); |
4b171585 | 514 | vap->va_mode = stat.mode; |
80093b6f AX |
515 | vap->va_uid = KUID_TO_SUID(stat.uid); |
516 | vap->va_gid = KGID_TO_SGID(stat.gid); | |
4b171585 | 517 | vap->va_fsid = 0; |
518 | vap->va_nodeid = stat.ino; | |
519 | vap->va_nlink = stat.nlink; | |
520 | vap->va_size = stat.size; | |
47995fa6 | 521 | vap->va_blksize = stat.blksize; |
dcd9cb5a BB |
522 | vap->va_atime = stat.atime; |
523 | vap->va_mtime = stat.mtime; | |
524 | vap->va_ctime = stat.ctime; | |
4b171585 | 525 | vap->va_rdev = stat.rdev; |
dcd9cb5a | 526 | vap->va_nblocks = stat.blocks; |
4b171585 | 527 | |
10946b02 | 528 | return (0); |
0b3cf046 | 529 | } |
4b171585 | 530 | EXPORT_SYMBOL(vn_getattr); |
531 | ||
2f5d55aa | 532 | int vn_fsync(vnode_t *vp, int flags, void *x3, void *x4) |
4b171585 | 533 | { |
36e6f861 | 534 | int datasync = 0; |
10946b02 AX |
535 | int error; |
536 | int fstrans; | |
36e6f861 | 537 | |
937879f1 | 538 | ASSERT(vp); |
539 | ASSERT(vp->v_file); | |
4b171585 | 540 | |
36e6f861 | 541 | if (flags & FDSYNC) |
542 | datasync = 1; | |
543 | ||
10946b02 AX |
544 | /* |
545 | * May enter XFS which generates a warning when PF_FSTRANS is set. | |
546 | * To avoid this the flag is cleared over vfs_sync() and then reset. | |
547 | */ | |
2ea56c1d | 548 | fstrans = __spl_pf_fstrans_check(); |
10946b02 | 549 | if (fstrans) |
2ea56c1d | 550 | current->flags &= ~(__SPL_PF_FSTRANS); |
10946b02 AX |
551 | |
552 | error = -spl_filp_fsync(vp->v_file, datasync); | |
553 | if (fstrans) | |
2ea56c1d | 554 | current->flags |= __SPL_PF_FSTRANS; |
10946b02 AX |
555 | |
556 | return (error); | |
4b171585 | 557 | } /* vn_fsync() */ |
558 | EXPORT_SYMBOL(vn_fsync); | |
af828292 | 559 | |
bbdc6ae4 ED |
560 | int vn_space(vnode_t *vp, int cmd, struct flock *bfp, int flag, |
561 | offset_t offset, void *x6, void *x7) | |
562 | { | |
563 | int error = EOPNOTSUPP; | |
2ea56c1d AX |
564 | #ifdef FALLOC_FL_PUNCH_HOLE |
565 | int fstrans; | |
566 | #endif | |
bbdc6ae4 ED |
567 | |
568 | if (cmd != F_FREESP || bfp->l_whence != 0) | |
10946b02 | 569 | return (EOPNOTSUPP); |
bbdc6ae4 ED |
570 | |
571 | ASSERT(vp); | |
572 | ASSERT(vp->v_file); | |
573 | ASSERT(bfp->l_start >= 0 && bfp->l_len > 0); | |
574 | ||
575 | #ifdef FALLOC_FL_PUNCH_HOLE | |
2ea56c1d AX |
576 | /* |
577 | * May enter XFS which generates a warning when PF_FSTRANS is set. | |
578 | * To avoid this the flag is cleared over vfs_sync() and then reset. | |
579 | */ | |
580 | fstrans = __spl_pf_fstrans_check(); | |
581 | if (fstrans) | |
582 | current->flags &= ~(__SPL_PF_FSTRANS); | |
583 | ||
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); | |
2ea56c1d AX |
591 | |
592 | if (fstrans) | |
593 | current->flags |= __SPL_PF_FSTRANS; | |
594 | ||
1c7b3eaf | 595 | if (error == 0) |
10946b02 | 596 | return (0); |
bbdc6ae4 ED |
597 | #endif |
598 | ||
599 | #ifdef HAVE_INODE_TRUNCATE_RANGE | |
600 | if (vp->v_file->f_dentry && vp->v_file->f_dentry->d_inode && | |
601 | vp->v_file->f_dentry->d_inode->i_op && | |
602 | vp->v_file->f_dentry->d_inode->i_op->truncate_range) { | |
603 | off_t end = bfp->l_start + bfp->l_len; | |
604 | /* | |
605 | * Judging from the code in shmem_truncate_range(), | |
606 | * it seems the kernel expects the end offset to be | |
607 | * inclusive and aligned to the end of a page. | |
608 | */ | |
609 | if (end % PAGE_SIZE != 0) { | |
610 | end &= ~(off_t)(PAGE_SIZE - 1); | |
611 | if (end <= bfp->l_start) | |
10946b02 | 612 | return (0); |
bbdc6ae4 ED |
613 | } |
614 | --end; | |
615 | ||
616 | vp->v_file->f_dentry->d_inode->i_op->truncate_range( | |
617 | vp->v_file->f_dentry->d_inode, | |
618 | bfp->l_start, end | |
619 | ); | |
10946b02 | 620 | return (0); |
bbdc6ae4 ED |
621 | } |
622 | #endif | |
623 | ||
10946b02 | 624 | return (error); |
bbdc6ae4 ED |
625 | } |
626 | EXPORT_SYMBOL(vn_space); | |
627 | ||
e4f1d29f | 628 | /* Function must be called while holding the vn_file_lock */ |
629 | static file_t * | |
f6188ddd | 630 | file_find(int fd, struct task_struct *task) |
e4f1d29f | 631 | { |
632 | file_t *fp; | |
633 | ||
937879f1 | 634 | ASSERT(spin_is_locked(&vn_file_lock)); |
e4f1d29f | 635 | |
636 | list_for_each_entry(fp, &vn_file_list, f_list) { | |
f6188ddd | 637 | if (fd == fp->f_fd && fp->f_task == task) { |
937879f1 | 638 | ASSERT(atomic_read(&fp->f_ref) != 0); |
e4f1d29f | 639 | return fp; |
640 | } | |
641 | } | |
642 | ||
643 | return NULL; | |
644 | } /* file_find() */ | |
645 | ||
646 | file_t * | |
647 | vn_getf(int fd) | |
648 | { | |
649 | struct kstat stat; | |
650 | struct file *lfp; | |
651 | file_t *fp; | |
652 | vnode_t *vp; | |
937879f1 | 653 | int rc = 0; |
e4f1d29f | 654 | |
f6188ddd AX |
655 | if (fd < 0) |
656 | return (NULL); | |
657 | ||
e4f1d29f | 658 | /* Already open just take an extra reference */ |
659 | spin_lock(&vn_file_lock); | |
660 | ||
f6188ddd | 661 | fp = file_find(fd, current); |
e4f1d29f | 662 | if (fp) { |
ec06701b AX |
663 | lfp = fget(fd); |
664 | fput(fp->f_file); | |
665 | /* | |
666 | * areleasef() can cause us to see a stale reference when | |
667 | * userspace has reused a file descriptor before areleasef() | |
668 | * has run. fput() the stale reference and replace it. We | |
669 | * retain the original reference count such that the concurrent | |
670 | * areleasef() will decrement its reference and terminate. | |
671 | */ | |
672 | if (lfp != fp->f_file) { | |
673 | fp->f_file = lfp; | |
674 | fp->f_vnode->v_file = lfp; | |
675 | } | |
e4f1d29f | 676 | atomic_inc(&fp->f_ref); |
677 | spin_unlock(&vn_file_lock); | |
10946b02 | 678 | return (fp); |
e4f1d29f | 679 | } |
680 | ||
681 | spin_unlock(&vn_file_lock); | |
682 | ||
683 | /* File was not yet opened create the object and setup */ | |
4afaaefa | 684 | fp = kmem_cache_alloc(vn_file_cache, KM_SLEEP); |
e4f1d29f | 685 | if (fp == NULL) |
10946b02 | 686 | goto out; |
e4f1d29f | 687 | |
688 | mutex_enter(&fp->f_lock); | |
689 | ||
690 | fp->f_fd = fd; | |
763b2f3b | 691 | fp->f_task = current; |
e4f1d29f | 692 | fp->f_offset = 0; |
693 | atomic_inc(&fp->f_ref); | |
694 | ||
695 | lfp = fget(fd); | |
696 | if (lfp == NULL) | |
10946b02 | 697 | goto out_mutex; |
e4f1d29f | 698 | |
699 | vp = vn_alloc(KM_SLEEP); | |
700 | if (vp == NULL) | |
10946b02 | 701 | goto out_fget; |
e4f1d29f | 702 | |
2ea56c1d AX |
703 | #if defined(HAVE_4ARGS_VFS_GETATTR) |
704 | rc = vfs_getattr(&lfp->f_path, &stat, STATX_TYPE, AT_STATX_SYNC_AS_STAT); | |
705 | #elif defined(HAVE_2ARGS_VFS_GETATTR) | |
2a305c34 RY |
706 | rc = vfs_getattr(&lfp->f_path, &stat); |
707 | #else | |
708 | rc = vfs_getattr(lfp->f_path.mnt, lfp->f_dentry, &stat); | |
709 | #endif | |
710 | if (rc) | |
10946b02 | 711 | goto out_vnode; |
e4f1d29f | 712 | |
713 | mutex_enter(&vp->v_lock); | |
4295b530 | 714 | vp->v_type = vn_mode_to_vtype(stat.mode); |
e4f1d29f | 715 | vp->v_file = lfp; |
716 | mutex_exit(&vp->v_lock); | |
717 | ||
718 | fp->f_vnode = vp; | |
719 | fp->f_file = lfp; | |
720 | ||
721 | /* Put it on the tracking list */ | |
722 | spin_lock(&vn_file_lock); | |
723 | list_add(&fp->f_list, &vn_file_list); | |
724 | spin_unlock(&vn_file_lock); | |
725 | ||
726 | mutex_exit(&fp->f_lock); | |
10946b02 | 727 | return (fp); |
e4f1d29f | 728 | |
729 | out_vnode: | |
e4f1d29f | 730 | vn_free(vp); |
731 | out_fget: | |
e4f1d29f | 732 | fput(lfp); |
733 | out_mutex: | |
e4f1d29f | 734 | mutex_exit(&fp->f_lock); |
735 | kmem_cache_free(vn_file_cache, fp); | |
736 | out: | |
10946b02 | 737 | return (NULL); |
e4f1d29f | 738 | } /* getf() */ |
739 | EXPORT_SYMBOL(getf); | |
740 | ||
741 | static void releasef_locked(file_t *fp) | |
742 | { | |
937879f1 | 743 | ASSERT(fp->f_file); |
744 | ASSERT(fp->f_vnode); | |
e4f1d29f | 745 | |
746 | /* Unlinked from list, no refs, safe to free outside mutex */ | |
747 | fput(fp->f_file); | |
748 | vn_free(fp->f_vnode); | |
749 | ||
750 | kmem_cache_free(vn_file_cache, fp); | |
751 | } | |
752 | ||
753 | void | |
754 | vn_releasef(int fd) | |
f6188ddd AX |
755 | { |
756 | areleasef(fd, P_FINFO(current)); | |
757 | } | |
758 | EXPORT_SYMBOL(releasef); | |
759 | ||
760 | void | |
761 | vn_areleasef(int fd, uf_info_t *fip) | |
e4f1d29f | 762 | { |
763 | file_t *fp; | |
f6188ddd AX |
764 | struct task_struct *task = (struct task_struct *)fip; |
765 | ||
766 | if (fd < 0) | |
767 | return; | |
e4f1d29f | 768 | |
769 | spin_lock(&vn_file_lock); | |
f6188ddd | 770 | fp = file_find(fd, task); |
e4f1d29f | 771 | if (fp) { |
772 | atomic_dec(&fp->f_ref); | |
773 | if (atomic_read(&fp->f_ref) > 0) { | |
774 | spin_unlock(&vn_file_lock); | |
775 | return; | |
776 | } | |
777 | ||
778 | list_del(&fp->f_list); | |
779 | releasef_locked(fp); | |
780 | } | |
781 | spin_unlock(&vn_file_lock); | |
782 | ||
783 | return; | |
784 | } /* releasef() */ | |
f6188ddd AX |
785 | EXPORT_SYMBOL(areleasef); |
786 | ||
e4f1d29f | 787 | |
10946b02 AX |
788 | static void |
789 | #ifdef HAVE_SET_FS_PWD_WITH_CONST | |
790 | vn_set_fs_pwd(struct fs_struct *fs, const struct path *path) | |
791 | #else | |
792 | vn_set_fs_pwd(struct fs_struct *fs, struct path *path) | |
793 | #endif /* HAVE_SET_FS_PWD_WITH_CONST */ | |
51a727e9 | 794 | { |
9b2048c2 BB |
795 | struct path old_pwd; |
796 | ||
10946b02 | 797 | #ifdef HAVE_FS_STRUCT_SPINLOCK |
9b2048c2 BB |
798 | spin_lock(&fs->lock); |
799 | old_pwd = fs->pwd; | |
800 | fs->pwd = *path; | |
801 | path_get(path); | |
802 | spin_unlock(&fs->lock); | |
10946b02 | 803 | #else |
9b2048c2 BB |
804 | write_lock(&fs->lock); |
805 | old_pwd = fs->pwd; | |
806 | fs->pwd = *path; | |
807 | path_get(path); | |
808 | write_unlock(&fs->lock); | |
10946b02 | 809 | #endif /* HAVE_FS_STRUCT_SPINLOCK */ |
9b2048c2 BB |
810 | |
811 | if (old_pwd.dentry) | |
812 | path_put(&old_pwd); | |
51a727e9 | 813 | } |
51a727e9 BB |
814 | |
815 | int | |
816 | vn_set_pwd(const char *filename) | |
817 | { | |
51a727e9 | 818 | struct path path; |
82a358d9 | 819 | mm_segment_t saved_fs; |
51a727e9 | 820 | int rc; |
51a727e9 | 821 | |
82a358d9 BB |
822 | /* |
823 | * user_path_dir() and __user_walk() both expect 'filename' to be | |
824 | * a user space address so we must briefly increase the data segment | |
825 | * size to ensure strncpy_from_user() does not fail with -EFAULT. | |
826 | */ | |
827 | saved_fs = get_fs(); | |
828 | set_fs(get_ds()); | |
829 | ||
51a727e9 BB |
830 | rc = user_path_dir(filename, &path); |
831 | if (rc) | |
10946b02 | 832 | goto out; |
51a727e9 BB |
833 | |
834 | rc = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS); | |
835 | if (rc) | |
10946b02 | 836 | goto dput_and_out; |
51a727e9 | 837 | |
10946b02 | 838 | vn_set_fs_pwd(current->fs, &path); |
51a727e9 BB |
839 | |
840 | dput_and_out: | |
841 | path_put(&path); | |
51a727e9 | 842 | out: |
82a358d9 BB |
843 | set_fs(saved_fs); |
844 | ||
10946b02 | 845 | return (-rc); |
51a727e9 BB |
846 | } /* vn_set_pwd() */ |
847 | EXPORT_SYMBOL(vn_set_pwd); | |
848 | ||
af828292 | 849 | static int |
850 | vn_cache_constructor(void *buf, void *cdrarg, int kmflags) | |
851 | { | |
852 | struct vnode *vp = buf; | |
853 | ||
854 | mutex_init(&vp->v_lock, NULL, MUTEX_DEFAULT, NULL); | |
855 | ||
856 | return (0); | |
857 | } /* vn_cache_constructor() */ | |
858 | ||
859 | static void | |
860 | vn_cache_destructor(void *buf, void *cdrarg) | |
861 | { | |
862 | struct vnode *vp = buf; | |
863 | ||
864 | mutex_destroy(&vp->v_lock); | |
865 | } /* vn_cache_destructor() */ | |
866 | ||
e4f1d29f | 867 | static int |
868 | vn_file_cache_constructor(void *buf, void *cdrarg, int kmflags) | |
869 | { | |
870 | file_t *fp = buf; | |
871 | ||
872 | atomic_set(&fp->f_ref, 0); | |
873 | mutex_init(&fp->f_lock, NULL, MUTEX_DEFAULT, NULL); | |
4e62fd41 | 874 | INIT_LIST_HEAD(&fp->f_list); |
e4f1d29f | 875 | |
876 | return (0); | |
877 | } /* file_cache_constructor() */ | |
878 | ||
879 | static void | |
880 | vn_file_cache_destructor(void *buf, void *cdrarg) | |
881 | { | |
882 | file_t *fp = buf; | |
883 | ||
884 | mutex_destroy(&fp->f_lock); | |
885 | } /* vn_file_cache_destructor() */ | |
886 | ||
af828292 | 887 | int |
12ff95ff | 888 | spl_vn_init(void) |
af828292 | 889 | { |
57d86234 | 890 | vn_cache = kmem_cache_create("spl_vn_cache", |
891 | sizeof(struct vnode), 64, | |
5d86345d | 892 | vn_cache_constructor, |
893 | vn_cache_destructor, | |
ac9cc135 | 894 | NULL, NULL, NULL, 0); |
e4f1d29f | 895 | |
896 | vn_file_cache = kmem_cache_create("spl_vn_file_cache", | |
897 | sizeof(file_t), 64, | |
898 | vn_file_cache_constructor, | |
899 | vn_file_cache_destructor, | |
ac9cc135 | 900 | NULL, NULL, NULL, 0); |
10946b02 | 901 | return (0); |
af828292 | 902 | } /* vn_init() */ |
903 | ||
904 | void | |
12ff95ff | 905 | spl_vn_fini(void) |
af828292 | 906 | { |
e4f1d29f | 907 | file_t *fp, *next_fp; |
2fb9b26a | 908 | int leaked = 0; |
e4f1d29f | 909 | |
910 | spin_lock(&vn_file_lock); | |
911 | ||
912 | list_for_each_entry_safe(fp, next_fp, &vn_file_list, f_list) { | |
913 | list_del(&fp->f_list); | |
914 | releasef_locked(fp); | |
915 | leaked++; | |
916 | } | |
917 | ||
e4f1d29f | 918 | spin_unlock(&vn_file_lock); |
919 | ||
920 | if (leaked > 0) | |
10946b02 | 921 | printk(KERN_WARNING "WARNING: %d vnode files leaked\n", leaked); |
e4f1d29f | 922 | |
2371321e | 923 | kmem_cache_destroy(vn_file_cache); |
2fb9b26a | 924 | kmem_cache_destroy(vn_cache); |
e4f1d29f | 925 | |
926 | return; | |
af828292 | 927 | } /* vn_fini() */ |