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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 BB |
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 BB |
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 | |
f7fd6ddd | 27 | #include <sys/cred.h> |
4b171585 | 28 | #include <sys/vnode.h> |
e5b9b344 | 29 | #include <sys/kmem_cache.h> |
bbdc6ae4 | 30 | #include <linux/falloc.h> |
52479ecf | 31 | #include <linux/file_compat.h> |
937879f1 | 32 | |
51a727e9 | 33 | vnode_t *rootdir = (vnode_t *)0xabcd1234; |
4b171585 BB |
34 | EXPORT_SYMBOL(rootdir); |
35 | ||
7afde631 BB |
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 BB |
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 BB |
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 BB |
109 | vp->v_type = 0; |
110 | } | |
111 | ||
8d9a23e8 | 112 | return (vp); |
af828292 BB |
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 BB |
133 | ASSERT(flags & (FWRITE | FREAD)); |
134 | ASSERT(seg == UIO_SYSSPACE); | |
135 | ASSERT(vpp); | |
4b171585 BB |
136 | *vpp = NULL; |
137 | ||
138 | if (!(flags & FCREAT) && (flags & FWRITE)) | |
139 | flags |= FEXCL; | |
140 | ||
728b9dd8 BB |
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 BB |
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 BB |
152 | |
153 | if (flags & FCREAT) | |
4b171585 | 154 | (void)xchg(¤t->fs->umask, saved_umask); |
0b3cf046 | 155 | |
f7e8739c | 156 | if (IS_ERR(fp)) |
8d9a23e8 | 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 BB |
164 | if (rc) { |
165 | filp_close(fp, 0); | |
8d9a23e8 | 166 | return (-rc); |
0b3cf046 BB |
167 | } |
168 | ||
af828292 | 169 | vp = vn_alloc(KM_SLEEP); |
4b171585 BB |
170 | if (!vp) { |
171 | filp_close(fp, 0); | |
8d9a23e8 | 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 | |
8d9a23e8 | 185 | return (0); |
4b171585 BB |
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; |
54cccfc2 | 199 | realpath = kmalloc(len, kmem_flags_convert(KM_SLEEP)); |
4b171585 | 200 | if (!realpath) |
8d9a23e8 | 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 BB |
205 | kfree(realpath); |
206 | ||
8d9a23e8 | 207 | return (rc); |
4b171585 BB |
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 BB |
215 | loff_t offset; |
216 | mm_segment_t saved_fs; | |
217 | struct file *fp; | |
218 | int rc; | |
219 | ||
937879f1 BB |
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 BB |
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 BB |
246 | |
247 | if (rc < 0) | |
8d9a23e8 | 248 | return (-rc); |
0b3cf046 | 249 | |
4b171585 BB |
250 | if (residp) { |
251 | *residp = len - rc; | |
0b3cf046 | 252 | } else { |
4b171585 | 253 | if (rc != len) |
8d9a23e8 | 254 | return (EIO); |
0b3cf046 BB |
255 | } |
256 | ||
8d9a23e8 | 257 | return (0); |
4b171585 BB |
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 BB |
263 | { |
264 | int rc; | |
265 | ||
937879f1 BB |
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 | |
8d9a23e8 | 273 | return (-rc); |
4b171585 BB |
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 | ||
ec18fe3c RY |
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 | ||
2bc5666f | 356 | spl_inode_lock(parent.dentry->d_inode); |
ec18fe3c RY |
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)) { | |
8d9a23e8 BB |
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; | |
8d9a23e8 | 390 | if (inode) { |
ec18fe3c | 391 | atomic_inc(&inode->i_count); |
8d9a23e8 BB |
392 | } else { |
393 | rc = 0; | |
394 | goto slashes; | |
395 | } | |
bcb15891 | 396 | |
50a0749e | 397 | #ifdef HAVE_2ARGS_VFS_UNLINK |
bcb15891 | 398 | rc = vfs_unlink(parent.dentry->d_inode, dentry); |
50a0749e RY |
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); | |
8d9a23e8 | 413 | return (-rc); |
bcb15891 YS |
414 | |
415 | slashes: | |
416 | rc = !dentry->d_inode ? -ENOENT : | |
417 | S_ISDIR(dentry->d_inode->i_mode) ? -EISDIR : -ENOTDIR; | |
8d9a23e8 | 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); | |
8d9a23e8 BB |
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); | |
8d9a23e8 BB |
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) | |
8d9a23e8 | 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) | |
8d9a23e8 | 459 | goto exit4; |
bcb15891 YS |
460 | |
461 | /* target should not be an ancestor of source */ | |
462 | rc = -ENOTEMPTY; | |
463 | if (new_dentry == trap) | |
8d9a23e8 | 464 | goto exit4; |
bcb15891 YS |
465 | |
466 | /* source must exist */ | |
467 | rc = -ENOENT; | |
468 | if (!old_dentry->d_inode) | |
8d9a23e8 | 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]) | |
8d9a23e8 | 475 | goto exit4; |
bcb15891 | 476 | if (new_dentry->d_name.name[new_dentry->d_name.len]) |
8d9a23e8 | 477 | goto exit4; |
bcb15891 YS |
478 | } |
479 | ||
ad3412ef | 480 | #if defined(HAVE_4ARGS_VFS_RENAME) |
bcb15891 | 481 | rc = vfs_rename(old_dir->d_inode, old_dentry, |
50a0749e | 482 | new_dir->d_inode, new_dentry); |
ad3412ef | 483 | #elif defined(HAVE_5ARGS_VFS_RENAME) |
50a0749e RY |
484 | rc = vfs_rename(old_dir->d_inode, old_dentry, |
485 | new_dir->d_inode, new_dentry, NULL); | |
ad3412ef CC |
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: | |
8d9a23e8 | 499 | return (-rc); |
bcb15891 YS |
500 | } |
501 | EXPORT_SYMBOL(vn_rename); | |
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 BB |
508 | int rc; |
509 | ||
937879f1 BB |
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) |
8d9a23e8 | 522 | return (-rc); |
4b171585 | 523 | |
4295b530 | 524 | vap->va_type = vn_mode_to_vtype(stat.mode); |
4b171585 | 525 | vap->va_mode = stat.mode; |
f7fd6ddd RY |
526 | vap->va_uid = KUID_TO_SUID(stat.uid); |
527 | vap->va_gid = KGID_TO_SGID(stat.gid); | |
4b171585 BB |
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 | |
8d9a23e8 | 539 | return (0); |
0b3cf046 | 540 | } |
4b171585 BB |
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; |
2a5d574e BB |
546 | int error; |
547 | int fstrans; | |
36e6f861 | 548 | |
937879f1 BB |
549 | ASSERT(vp); |
550 | ASSERT(vp->v_file); | |
4b171585 | 551 | |
36e6f861 BB |
552 | if (flags & FDSYNC) |
553 | datasync = 1; | |
554 | ||
2a5d574e BB |
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 BB |
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) | |
8d9a23e8 | 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) | |
8d9a23e8 | 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) | |
8d9a23e8 | 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 | ); | |
8d9a23e8 | 616 | return (0); |
bbdc6ae4 ED |
617 | } |
618 | #endif | |
619 | ||
8d9a23e8 | 620 | return (error); |
bbdc6ae4 ED |
621 | } |
622 | EXPORT_SYMBOL(vn_space); | |
623 | ||
e4f1d29f BB |
624 | /* Function must be called while holding the vn_file_lock */ |
625 | static file_t * | |
d3c677bc | 626 | file_find(int fd, struct task_struct *task) |
e4f1d29f BB |
627 | { |
628 | file_t *fp; | |
629 | ||
937879f1 | 630 | ASSERT(spin_is_locked(&vn_file_lock)); |
e4f1d29f BB |
631 | |
632 | list_for_each_entry(fp, &vn_file_list, f_list) { | |
d3c677bc | 633 | if (fd == fp->f_fd && fp->f_task == task) { |
937879f1 | 634 | ASSERT(atomic_read(&fp->f_ref) != 0); |
e4f1d29f BB |
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 | |
313b1ea6 RY |
651 | if (fd < 0) |
652 | return (NULL); | |
653 | ||
e4f1d29f BB |
654 | /* Already open just take an extra reference */ |
655 | spin_lock(&vn_file_lock); | |
656 | ||
d3c677bc | 657 | fp = file_find(fd, current); |
e4f1d29f | 658 | if (fp) { |
1683e75e RY |
659 | lfp = fget(fd); |
660 | fput(fp->f_file); | |
661 | /* | |
662 | * areleasef() can cause us to see a stale reference when | |
663 | * userspace has reused a file descriptor before areleasef() | |
664 | * has run. fput() the stale reference and replace it. We | |
665 | * retain the original reference count such that the concurrent | |
666 | * areleasef() will decrement its reference and terminate. | |
667 | */ | |
668 | if (lfp != fp->f_file) { | |
669 | fp->f_file = lfp; | |
670 | fp->f_vnode->v_file = lfp; | |
671 | } | |
e4f1d29f BB |
672 | atomic_inc(&fp->f_ref); |
673 | spin_unlock(&vn_file_lock); | |
8d9a23e8 | 674 | return (fp); |
e4f1d29f BB |
675 | } |
676 | ||
677 | spin_unlock(&vn_file_lock); | |
678 | ||
679 | /* File was not yet opened create the object and setup */ | |
4afaaefa | 680 | fp = kmem_cache_alloc(vn_file_cache, KM_SLEEP); |
e4f1d29f | 681 | if (fp == NULL) |
8d9a23e8 | 682 | goto out; |
e4f1d29f BB |
683 | |
684 | mutex_enter(&fp->f_lock); | |
685 | ||
686 | fp->f_fd = fd; | |
763b2f3b | 687 | fp->f_task = current; |
e4f1d29f BB |
688 | fp->f_offset = 0; |
689 | atomic_inc(&fp->f_ref); | |
690 | ||
691 | lfp = fget(fd); | |
692 | if (lfp == NULL) | |
8d9a23e8 | 693 | goto out_mutex; |
e4f1d29f BB |
694 | |
695 | vp = vn_alloc(KM_SLEEP); | |
696 | if (vp == NULL) | |
8d9a23e8 | 697 | goto out_fget; |
e4f1d29f | 698 | |
2a305c34 RY |
699 | #ifdef HAVE_2ARGS_VFS_GETATTR |
700 | rc = vfs_getattr(&lfp->f_path, &stat); | |
701 | #else | |
702 | rc = vfs_getattr(lfp->f_path.mnt, lfp->f_dentry, &stat); | |
703 | #endif | |
704 | if (rc) | |
8d9a23e8 | 705 | goto out_vnode; |
e4f1d29f BB |
706 | |
707 | mutex_enter(&vp->v_lock); | |
4295b530 | 708 | vp->v_type = vn_mode_to_vtype(stat.mode); |
e4f1d29f BB |
709 | vp->v_file = lfp; |
710 | mutex_exit(&vp->v_lock); | |
711 | ||
712 | fp->f_vnode = vp; | |
713 | fp->f_file = lfp; | |
714 | ||
715 | /* Put it on the tracking list */ | |
716 | spin_lock(&vn_file_lock); | |
717 | list_add(&fp->f_list, &vn_file_list); | |
718 | spin_unlock(&vn_file_lock); | |
719 | ||
720 | mutex_exit(&fp->f_lock); | |
8d9a23e8 | 721 | return (fp); |
e4f1d29f BB |
722 | |
723 | out_vnode: | |
e4f1d29f BB |
724 | vn_free(vp); |
725 | out_fget: | |
e4f1d29f BB |
726 | fput(lfp); |
727 | out_mutex: | |
e4f1d29f BB |
728 | mutex_exit(&fp->f_lock); |
729 | kmem_cache_free(vn_file_cache, fp); | |
730 | out: | |
8d9a23e8 | 731 | return (NULL); |
e4f1d29f BB |
732 | } /* getf() */ |
733 | EXPORT_SYMBOL(getf); | |
734 | ||
735 | static void releasef_locked(file_t *fp) | |
736 | { | |
937879f1 BB |
737 | ASSERT(fp->f_file); |
738 | ASSERT(fp->f_vnode); | |
e4f1d29f BB |
739 | |
740 | /* Unlinked from list, no refs, safe to free outside mutex */ | |
741 | fput(fp->f_file); | |
742 | vn_free(fp->f_vnode); | |
743 | ||
744 | kmem_cache_free(vn_file_cache, fp); | |
745 | } | |
746 | ||
747 | void | |
748 | vn_releasef(int fd) | |
d3c677bc RY |
749 | { |
750 | areleasef(fd, P_FINFO(current)); | |
751 | } | |
752 | EXPORT_SYMBOL(releasef); | |
753 | ||
754 | void | |
755 | vn_areleasef(int fd, uf_info_t *fip) | |
e4f1d29f BB |
756 | { |
757 | file_t *fp; | |
d3c677bc | 758 | struct task_struct *task = (struct task_struct *)fip; |
e4f1d29f | 759 | |
313b1ea6 RY |
760 | if (fd < 0) |
761 | return; | |
762 | ||
e4f1d29f | 763 | spin_lock(&vn_file_lock); |
d3c677bc | 764 | fp = file_find(fd, task); |
e4f1d29f BB |
765 | if (fp) { |
766 | atomic_dec(&fp->f_ref); | |
767 | if (atomic_read(&fp->f_ref) > 0) { | |
768 | spin_unlock(&vn_file_lock); | |
769 | return; | |
770 | } | |
771 | ||
772 | list_del(&fp->f_list); | |
773 | releasef_locked(fp); | |
774 | } | |
775 | spin_unlock(&vn_file_lock); | |
776 | ||
777 | return; | |
778 | } /* releasef() */ | |
d3c677bc RY |
779 | EXPORT_SYMBOL(areleasef); |
780 | ||
e4f1d29f | 781 | |
137af025 BB |
782 | static void |
783 | #ifdef HAVE_SET_FS_PWD_WITH_CONST | |
784 | vn_set_fs_pwd(struct fs_struct *fs, const struct path *path) | |
785 | #else | |
786 | vn_set_fs_pwd(struct fs_struct *fs, struct path *path) | |
787 | #endif /* HAVE_SET_FS_PWD_WITH_CONST */ | |
51a727e9 | 788 | { |
9b2048c2 BB |
789 | struct path old_pwd; |
790 | ||
137af025 | 791 | #ifdef HAVE_FS_STRUCT_SPINLOCK |
9b2048c2 BB |
792 | spin_lock(&fs->lock); |
793 | old_pwd = fs->pwd; | |
794 | fs->pwd = *path; | |
795 | path_get(path); | |
796 | spin_unlock(&fs->lock); | |
137af025 | 797 | #else |
9b2048c2 BB |
798 | write_lock(&fs->lock); |
799 | old_pwd = fs->pwd; | |
800 | fs->pwd = *path; | |
801 | path_get(path); | |
802 | write_unlock(&fs->lock); | |
137af025 | 803 | #endif /* HAVE_FS_STRUCT_SPINLOCK */ |
9b2048c2 BB |
804 | |
805 | if (old_pwd.dentry) | |
806 | path_put(&old_pwd); | |
51a727e9 | 807 | } |
51a727e9 BB |
808 | |
809 | int | |
810 | vn_set_pwd(const char *filename) | |
811 | { | |
51a727e9 | 812 | struct path path; |
82a358d9 | 813 | mm_segment_t saved_fs; |
51a727e9 | 814 | int rc; |
51a727e9 | 815 | |
82a358d9 BB |
816 | /* |
817 | * user_path_dir() and __user_walk() both expect 'filename' to be | |
818 | * a user space address so we must briefly increase the data segment | |
819 | * size to ensure strncpy_from_user() does not fail with -EFAULT. | |
820 | */ | |
821 | saved_fs = get_fs(); | |
822 | set_fs(get_ds()); | |
823 | ||
51a727e9 BB |
824 | rc = user_path_dir(filename, &path); |
825 | if (rc) | |
8d9a23e8 | 826 | goto out; |
51a727e9 BB |
827 | |
828 | rc = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS); | |
829 | if (rc) | |
8d9a23e8 | 830 | goto dput_and_out; |
51a727e9 | 831 | |
137af025 | 832 | vn_set_fs_pwd(current->fs, &path); |
51a727e9 BB |
833 | |
834 | dput_and_out: | |
835 | path_put(&path); | |
51a727e9 | 836 | out: |
82a358d9 BB |
837 | set_fs(saved_fs); |
838 | ||
8d9a23e8 | 839 | return (-rc); |
51a727e9 BB |
840 | } /* vn_set_pwd() */ |
841 | EXPORT_SYMBOL(vn_set_pwd); | |
842 | ||
af828292 BB |
843 | static int |
844 | vn_cache_constructor(void *buf, void *cdrarg, int kmflags) | |
845 | { | |
846 | struct vnode *vp = buf; | |
847 | ||
848 | mutex_init(&vp->v_lock, NULL, MUTEX_DEFAULT, NULL); | |
849 | ||
850 | return (0); | |
851 | } /* vn_cache_constructor() */ | |
852 | ||
853 | static void | |
854 | vn_cache_destructor(void *buf, void *cdrarg) | |
855 | { | |
856 | struct vnode *vp = buf; | |
857 | ||
858 | mutex_destroy(&vp->v_lock); | |
859 | } /* vn_cache_destructor() */ | |
860 | ||
e4f1d29f BB |
861 | static int |
862 | vn_file_cache_constructor(void *buf, void *cdrarg, int kmflags) | |
863 | { | |
864 | file_t *fp = buf; | |
865 | ||
866 | atomic_set(&fp->f_ref, 0); | |
867 | mutex_init(&fp->f_lock, NULL, MUTEX_DEFAULT, NULL); | |
4e62fd41 | 868 | INIT_LIST_HEAD(&fp->f_list); |
e4f1d29f BB |
869 | |
870 | return (0); | |
871 | } /* file_cache_constructor() */ | |
872 | ||
873 | static void | |
874 | vn_file_cache_destructor(void *buf, void *cdrarg) | |
875 | { | |
876 | file_t *fp = buf; | |
877 | ||
878 | mutex_destroy(&fp->f_lock); | |
879 | } /* vn_file_cache_destructor() */ | |
880 | ||
af828292 | 881 | int |
12ff95ff | 882 | spl_vn_init(void) |
af828292 | 883 | { |
57d86234 BB |
884 | vn_cache = kmem_cache_create("spl_vn_cache", |
885 | sizeof(struct vnode), 64, | |
5d86345d BB |
886 | vn_cache_constructor, |
887 | vn_cache_destructor, | |
a5b40eed | 888 | NULL, NULL, NULL, KMC_KMEM); |
e4f1d29f BB |
889 | |
890 | vn_file_cache = kmem_cache_create("spl_vn_file_cache", | |
891 | sizeof(file_t), 64, | |
892 | vn_file_cache_constructor, | |
893 | vn_file_cache_destructor, | |
a5b40eed | 894 | NULL, NULL, NULL, KMC_KMEM); |
8d9a23e8 | 895 | return (0); |
af828292 BB |
896 | } /* vn_init() */ |
897 | ||
898 | void | |
12ff95ff | 899 | spl_vn_fini(void) |
af828292 | 900 | { |
e4f1d29f | 901 | file_t *fp, *next_fp; |
2fb9b26a | 902 | int leaked = 0; |
e4f1d29f BB |
903 | |
904 | spin_lock(&vn_file_lock); | |
905 | ||
906 | list_for_each_entry_safe(fp, next_fp, &vn_file_list, f_list) { | |
907 | list_del(&fp->f_list); | |
908 | releasef_locked(fp); | |
909 | leaked++; | |
910 | } | |
911 | ||
e4f1d29f BB |
912 | spin_unlock(&vn_file_lock); |
913 | ||
914 | if (leaked > 0) | |
8d9a23e8 | 915 | printk(KERN_WARNING "WARNING: %d vnode files leaked\n", leaked); |
e4f1d29f | 916 | |
2371321e | 917 | kmem_cache_destroy(vn_file_cache); |
2fb9b26a | 918 | kmem_cache_destroy(vn_cache); |
e4f1d29f BB |
919 | |
920 | return; | |
af828292 | 921 | } /* vn_fini() */ |