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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 BB |
8 | * This file is part of the SPL, Solaris Porting Layer. |
9 | * For details, see <http://github.com/behlendorf/spl/>. | |
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 | |
4b171585 | 27 | #include <sys/vnode.h> |
55abb092 | 28 | #include <spl-debug.h> |
937879f1 | 29 | |
b17edc10 BB |
30 | #ifdef SS_DEBUG_SUBSYS |
31 | #undef SS_DEBUG_SUBSYS | |
937879f1 | 32 | #endif |
33 | ||
b17edc10 | 34 | #define SS_DEBUG_SUBSYS SS_VNODE |
937879f1 | 35 | |
51a727e9 | 36 | vnode_t *rootdir = (vnode_t *)0xabcd1234; |
4b171585 | 37 | EXPORT_SYMBOL(rootdir); |
38 | ||
7afde631 | 39 | static spl_kmem_cache_t *vn_cache; |
40 | static spl_kmem_cache_t *vn_file_cache; | |
e4f1d29f | 41 | |
83c623aa | 42 | static DEFINE_SPINLOCK(vn_file_lock); |
e4f1d29f | 43 | static LIST_HEAD(vn_file_list); |
af828292 | 44 | |
12ff95ff BB |
45 | #ifdef HAVE_KERN_PATH_PARENT_HEADER |
46 | #ifndef HAVE_KERN_PATH_PARENT_SYMBOL | |
47 | kern_path_parent_t kern_path_parent_fn = SYMBOL_POISON; | |
48 | EXPORT_SYMBOL(kern_path_parent_fn); | |
49 | #endif /* HAVE_KERN_PATH_PARENT_SYMBOL */ | |
50 | #endif /* HAVE_KERN_PATH_PARENT_HEADER */ | |
51 | ||
4295b530 BB |
52 | vtype_t |
53 | vn_mode_to_vtype(mode_t mode) | |
4b171585 | 54 | { |
55 | if (S_ISREG(mode)) | |
56 | return VREG; | |
57 | ||
58 | if (S_ISDIR(mode)) | |
59 | return VDIR; | |
60 | ||
61 | if (S_ISCHR(mode)) | |
62 | return VCHR; | |
63 | ||
64 | if (S_ISBLK(mode)) | |
65 | return VBLK; | |
66 | ||
67 | if (S_ISFIFO(mode)) | |
68 | return VFIFO; | |
69 | ||
70 | if (S_ISLNK(mode)) | |
71 | return VLNK; | |
72 | ||
73 | if (S_ISSOCK(mode)) | |
74 | return VSOCK; | |
75 | ||
76 | if (S_ISCHR(mode)) | |
77 | return VCHR; | |
78 | ||
79 | return VNON; | |
4295b530 BB |
80 | } /* vn_mode_to_vtype() */ |
81 | EXPORT_SYMBOL(vn_mode_to_vtype); | |
82 | ||
83 | mode_t | |
84 | vn_vtype_to_mode(vtype_t vtype) | |
85 | { | |
86 | if (vtype == VREG) | |
87 | return S_IFREG; | |
88 | ||
89 | if (vtype == VDIR) | |
90 | return S_IFDIR; | |
91 | ||
92 | if (vtype == VCHR) | |
93 | return S_IFCHR; | |
94 | ||
95 | if (vtype == VBLK) | |
96 | return S_IFBLK; | |
97 | ||
98 | if (vtype == VFIFO) | |
99 | return S_IFIFO; | |
100 | ||
101 | if (vtype == VLNK) | |
102 | return S_IFLNK; | |
103 | ||
104 | if (vtype == VSOCK) | |
105 | return S_IFSOCK; | |
106 | ||
107 | return VNON; | |
108 | } /* vn_vtype_to_mode() */ | |
109 | EXPORT_SYMBOL(vn_vtype_to_mode); | |
4b171585 | 110 | |
af828292 | 111 | vnode_t * |
112 | vn_alloc(int flag) | |
113 | { | |
114 | vnode_t *vp; | |
b17edc10 | 115 | SENTRY; |
af828292 | 116 | |
117 | vp = kmem_cache_alloc(vn_cache, flag); | |
af828292 | 118 | if (vp != NULL) { |
e4f1d29f | 119 | vp->v_file = NULL; |
af828292 | 120 | vp->v_type = 0; |
121 | } | |
122 | ||
b17edc10 | 123 | SRETURN(vp); |
af828292 | 124 | } /* vn_alloc() */ |
125 | EXPORT_SYMBOL(vn_alloc); | |
126 | ||
127 | void | |
128 | vn_free(vnode_t *vp) | |
129 | { | |
b17edc10 | 130 | SENTRY; |
af828292 | 131 | kmem_cache_free(vn_cache, vp); |
b17edc10 | 132 | SEXIT; |
af828292 | 133 | } /* vn_free() */ |
134 | EXPORT_SYMBOL(vn_free); | |
135 | ||
0b3cf046 | 136 | int |
af828292 | 137 | vn_open(const char *path, uio_seg_t seg, int flags, int mode, |
4b171585 | 138 | vnode_t **vpp, int x1, void *x2) |
0b3cf046 | 139 | { |
f7e8739c RC |
140 | struct file *fp; |
141 | struct kstat stat; | |
142 | int rc, saved_umask = 0; | |
4be55565 | 143 | gfp_t saved_gfp; |
0b3cf046 | 144 | vnode_t *vp; |
b17edc10 | 145 | SENTRY; |
0b3cf046 | 146 | |
937879f1 | 147 | ASSERT(flags & (FWRITE | FREAD)); |
148 | ASSERT(seg == UIO_SYSSPACE); | |
149 | ASSERT(vpp); | |
4b171585 | 150 | *vpp = NULL; |
151 | ||
152 | if (!(flags & FCREAT) && (flags & FWRITE)) | |
153 | flags |= FEXCL; | |
154 | ||
728b9dd8 | 155 | /* Note for filp_open() the two low bits must be remapped to mean: |
156 | * 01 - read-only -> 00 read-only | |
157 | * 10 - write-only -> 01 write-only | |
158 | * 11 - read-write -> 10 read-write | |
159 | */ | |
160 | flags--; | |
0b3cf046 | 161 | |
162 | if (flags & FCREAT) | |
4b171585 | 163 | saved_umask = xchg(¤t->fs->umask, 0); |
0b3cf046 | 164 | |
f7e8739c | 165 | fp = filp_open(path, flags, mode); |
0b3cf046 | 166 | |
167 | if (flags & FCREAT) | |
4b171585 | 168 | (void)xchg(¤t->fs->umask, saved_umask); |
0b3cf046 | 169 | |
f7e8739c | 170 | if (IS_ERR(fp)) |
b17edc10 | 171 | SRETURN(-PTR_ERR(fp)); |
0b3cf046 | 172 | |
f7e8739c | 173 | rc = vfs_getattr(fp->f_vfsmnt, fp->f_dentry, &stat); |
4b171585 | 174 | if (rc) { |
175 | filp_close(fp, 0); | |
b17edc10 | 176 | SRETURN(-rc); |
0b3cf046 | 177 | } |
178 | ||
af828292 | 179 | vp = vn_alloc(KM_SLEEP); |
4b171585 | 180 | if (!vp) { |
181 | filp_close(fp, 0); | |
b17edc10 | 182 | SRETURN(ENOMEM); |
4b171585 | 183 | } |
0b3cf046 | 184 | |
4be55565 LW |
185 | saved_gfp = mapping_gfp_mask(fp->f_mapping); |
186 | mapping_set_gfp_mask(fp->f_mapping, saved_gfp & ~(__GFP_IO|__GFP_FS)); | |
187 | ||
e4f1d29f | 188 | mutex_enter(&vp->v_lock); |
4295b530 | 189 | vp->v_type = vn_mode_to_vtype(stat.mode); |
e4f1d29f | 190 | vp->v_file = fp; |
4be55565 | 191 | vp->v_gfp_mask = saved_gfp; |
4b171585 | 192 | *vpp = vp; |
e4f1d29f | 193 | mutex_exit(&vp->v_lock); |
0b3cf046 | 194 | |
b17edc10 | 195 | SRETURN(0); |
4b171585 | 196 | } /* vn_open() */ |
197 | EXPORT_SYMBOL(vn_open); | |
0b3cf046 | 198 | |
0b3cf046 | 199 | int |
af828292 | 200 | vn_openat(const char *path, uio_seg_t seg, int flags, int mode, |
4b171585 | 201 | vnode_t **vpp, int x1, void *x2, vnode_t *vp, int fd) |
0b3cf046 | 202 | { |
4b171585 | 203 | char *realpath; |
12018327 | 204 | int len, rc; |
b17edc10 | 205 | SENTRY; |
0b3cf046 | 206 | |
937879f1 | 207 | ASSERT(vp == rootdir); |
0b3cf046 | 208 | |
12018327 | 209 | len = strlen(path) + 2; |
210 | realpath = kmalloc(len, GFP_KERNEL); | |
4b171585 | 211 | if (!realpath) |
b17edc10 | 212 | SRETURN(ENOMEM); |
0b3cf046 | 213 | |
12018327 | 214 | (void)snprintf(realpath, len, "/%s", path); |
4b171585 | 215 | rc = vn_open(realpath, seg, flags, mode, vpp, x1, x2); |
4b171585 | 216 | kfree(realpath); |
217 | ||
b17edc10 | 218 | SRETURN(rc); |
4b171585 | 219 | } /* vn_openat() */ |
220 | EXPORT_SYMBOL(vn_openat); | |
0b3cf046 | 221 | |
0b3cf046 | 222 | int |
4b171585 | 223 | vn_rdwr(uio_rw_t uio, vnode_t *vp, void *addr, ssize_t len, offset_t off, |
663e02a1 | 224 | uio_seg_t seg, int ioflag, rlim64_t x2, void *x3, ssize_t *residp) |
0b3cf046 | 225 | { |
4b171585 | 226 | loff_t offset; |
227 | mm_segment_t saved_fs; | |
228 | struct file *fp; | |
229 | int rc; | |
b17edc10 | 230 | SENTRY; |
4b171585 | 231 | |
937879f1 | 232 | ASSERT(uio == UIO_WRITE || uio == UIO_READ); |
233 | ASSERT(vp); | |
234 | ASSERT(vp->v_file); | |
235 | ASSERT(seg == UIO_SYSSPACE); | |
663e02a1 | 236 | ASSERT((ioflag & ~FAPPEND) == 0); |
937879f1 | 237 | ASSERT(x2 == RLIM64_INFINITY); |
4b171585 | 238 | |
e4f1d29f | 239 | fp = vp->v_file; |
4b171585 | 240 | |
663e02a1 RC |
241 | offset = off; |
242 | if (ioflag & FAPPEND) | |
243 | offset = fp->f_pos; | |
244 | ||
4b171585 | 245 | /* Writable user data segment must be briefly increased for this |
246 | * process so we can use the user space read call paths to write | |
247 | * in to memory allocated by the kernel. */ | |
248 | saved_fs = get_fs(); | |
249 | set_fs(get_ds()); | |
250 | ||
251 | if (uio & UIO_WRITE) | |
252 | rc = vfs_write(fp, addr, len, &offset); | |
253 | else | |
254 | rc = vfs_read(fp, addr, len, &offset); | |
255 | ||
256 | set_fs(saved_fs); | |
f3989ed3 | 257 | fp->f_pos = offset; |
4b171585 | 258 | |
259 | if (rc < 0) | |
b17edc10 | 260 | SRETURN(-rc); |
0b3cf046 | 261 | |
4b171585 | 262 | if (residp) { |
263 | *residp = len - rc; | |
0b3cf046 | 264 | } else { |
4b171585 | 265 | if (rc != len) |
b17edc10 | 266 | SRETURN(EIO); |
0b3cf046 | 267 | } |
268 | ||
b17edc10 | 269 | SRETURN(0); |
4b171585 | 270 | } /* vn_rdwr() */ |
271 | EXPORT_SYMBOL(vn_rdwr); | |
272 | ||
273 | int | |
2f5d55aa | 274 | vn_close(vnode_t *vp, int flags, int x1, int x2, void *x3, void *x4) |
4b171585 | 275 | { |
276 | int rc; | |
b17edc10 | 277 | SENTRY; |
4b171585 | 278 | |
937879f1 | 279 | ASSERT(vp); |
280 | ASSERT(vp->v_file); | |
4b171585 | 281 | |
4be55565 | 282 | mapping_set_gfp_mask(vp->v_file->f_mapping, vp->v_gfp_mask); |
97735c39 BB |
283 | rc = filp_close(vp->v_file, 0); |
284 | vn_free(vp); | |
4b171585 | 285 | |
b17edc10 | 286 | SRETURN(-rc); |
4b171585 | 287 | } /* vn_close() */ |
288 | EXPORT_SYMBOL(vn_close); | |
289 | ||
97735c39 BB |
290 | /* vn_seek() does not actually seek it only performs bounds checking on the |
291 | * proposed seek. We perform minimal checking and allow vn_rdwr() to catch | |
292 | * anything more serious. */ | |
293 | int | |
47995fa6 | 294 | vn_seek(vnode_t *vp, offset_t ooff, offset_t *noffp, void *ct) |
97735c39 BB |
295 | { |
296 | return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0); | |
297 | } | |
298 | EXPORT_SYMBOL(vn_seek); | |
299 | ||
300 | static struct dentry * | |
301 | vn_lookup_hash(struct nameidata *nd) | |
4b171585 | 302 | { |
849c50e7 BB |
303 | return lookup_one_len((const char *)nd->last.name, |
304 | nd->nd_dentry, nd->last.len); | |
4b171585 | 305 | } /* lookup_hash() */ |
306 | ||
97735c39 BB |
307 | static void |
308 | vn_path_release(struct nameidata *nd) | |
57d86234 | 309 | { |
310 | dput(nd->nd_dentry); | |
311 | mntput(nd->nd_mnt); | |
312 | } | |
313 | ||
4b171585 | 314 | /* Modified do_unlinkat() from linux/fs/namei.c, only uses exported symbols */ |
315 | int | |
af828292 | 316 | vn_remove(const char *path, uio_seg_t seg, int flags) |
4b171585 | 317 | { |
318 | struct dentry *dentry; | |
319 | struct nameidata nd; | |
320 | struct inode *inode = NULL; | |
321 | int rc = 0; | |
b17edc10 | 322 | SENTRY; |
4b171585 | 323 | |
3d061e9d | 324 | ASSERT(seg == UIO_SYSSPACE); |
325 | ASSERT(flags == RMFILE); | |
2f5d55aa | 326 | |
b1cbc461 | 327 | rc = spl_kern_path_parent(path, &nd); |
4b171585 | 328 | if (rc) |
b17edc10 | 329 | SGOTO(exit, rc); |
4b171585 | 330 | |
331 | rc = -EISDIR; | |
332 | if (nd.last_type != LAST_NORM) | |
b17edc10 | 333 | SGOTO(exit1, rc); |
4b171585 | 334 | |
6bf4d76f | 335 | spl_inode_lock_nested(nd.nd_dentry->d_inode, I_MUTEX_PARENT); |
57d86234 | 336 | dentry = vn_lookup_hash(&nd); |
4b171585 | 337 | rc = PTR_ERR(dentry); |
338 | if (!IS_ERR(dentry)) { | |
339 | /* Why not before? Because we want correct rc value */ | |
340 | if (nd.last.name[nd.last.len]) | |
b17edc10 | 341 | SGOTO(slashes, rc); |
937879f1 | 342 | |
4b171585 | 343 | inode = dentry->d_inode; |
344 | if (inode) | |
345 | atomic_inc(&inode->i_count); | |
a093c6a4 | 346 | #ifdef HAVE_2ARGS_VFS_UNLINK |
57d86234 | 347 | rc = vfs_unlink(nd.nd_dentry->d_inode, dentry); |
a093c6a4 | 348 | #else |
21411161 | 349 | rc = vfs_unlink(nd.nd_dentry->d_inode, dentry, nd.nd_mnt); |
a093c6a4 | 350 | #endif /* HAVE_2ARGS_VFS_UNLINK */ |
4b171585 | 351 | exit2: |
352 | dput(dentry); | |
353 | } | |
6bf4d76f BB |
354 | |
355 | spl_inode_unlock(nd.nd_dentry->d_inode); | |
4b171585 | 356 | if (inode) |
357 | iput(inode); /* truncate the inode here */ | |
358 | exit1: | |
57d86234 | 359 | vn_path_release(&nd); |
4b171585 | 360 | exit: |
b17edc10 | 361 | SRETURN(-rc); |
4b171585 | 362 | |
363 | slashes: | |
364 | rc = !dentry->d_inode ? -ENOENT : | |
365 | S_ISDIR(dentry->d_inode->i_mode) ? -EISDIR : -ENOTDIR; | |
b17edc10 | 366 | SGOTO(exit2, rc); |
4b171585 | 367 | } /* vn_remove() */ |
368 | EXPORT_SYMBOL(vn_remove); | |
369 | ||
370 | /* Modified do_rename() from linux/fs/namei.c, only uses exported symbols */ | |
371 | int | |
372 | vn_rename(const char *oldname, const char *newname, int x1) | |
373 | { | |
a093c6a4 BB |
374 | struct dentry *old_dir, *new_dir; |
375 | struct dentry *old_dentry, *new_dentry; | |
376 | struct dentry *trap; | |
4b171585 | 377 | struct nameidata oldnd, newnd; |
378 | int rc = 0; | |
b17edc10 | 379 | SENTRY; |
4b171585 | 380 | |
b1cbc461 | 381 | rc = spl_kern_path_parent(oldname, &oldnd); |
4b171585 | 382 | if (rc) |
b17edc10 | 383 | SGOTO(exit, rc); |
4b171585 | 384 | |
b1cbc461 | 385 | rc = spl_kern_path_parent(newname, &newnd); |
4b171585 | 386 | if (rc) |
b17edc10 | 387 | SGOTO(exit1, rc); |
4b171585 | 388 | |
389 | rc = -EXDEV; | |
57d86234 | 390 | if (oldnd.nd_mnt != newnd.nd_mnt) |
b17edc10 | 391 | SGOTO(exit2, rc); |
4b171585 | 392 | |
57d86234 | 393 | old_dir = oldnd.nd_dentry; |
4b171585 | 394 | rc = -EBUSY; |
395 | if (oldnd.last_type != LAST_NORM) | |
b17edc10 | 396 | SGOTO(exit2, rc); |
4b171585 | 397 | |
57d86234 | 398 | new_dir = newnd.nd_dentry; |
4b171585 | 399 | if (newnd.last_type != LAST_NORM) |
b17edc10 | 400 | SGOTO(exit2, rc); |
4b171585 | 401 | |
402 | trap = lock_rename(new_dir, old_dir); | |
403 | ||
57d86234 | 404 | old_dentry = vn_lookup_hash(&oldnd); |
4b171585 | 405 | |
406 | rc = PTR_ERR(old_dentry); | |
407 | if (IS_ERR(old_dentry)) | |
b17edc10 | 408 | SGOTO(exit3, rc); |
4b171585 | 409 | |
410 | /* source must exist */ | |
411 | rc = -ENOENT; | |
412 | if (!old_dentry->d_inode) | |
b17edc10 | 413 | SGOTO(exit4, rc); |
4b171585 | 414 | |
415 | /* unless the source is a directory trailing slashes give -ENOTDIR */ | |
416 | if (!S_ISDIR(old_dentry->d_inode->i_mode)) { | |
417 | rc = -ENOTDIR; | |
418 | if (oldnd.last.name[oldnd.last.len]) | |
b17edc10 | 419 | SGOTO(exit4, rc); |
4b171585 | 420 | if (newnd.last.name[newnd.last.len]) |
b17edc10 | 421 | SGOTO(exit4, rc); |
4b171585 | 422 | } |
423 | ||
424 | /* source should not be ancestor of target */ | |
425 | rc = -EINVAL; | |
426 | if (old_dentry == trap) | |
b17edc10 | 427 | SGOTO(exit4, rc); |
4b171585 | 428 | |
57d86234 | 429 | new_dentry = vn_lookup_hash(&newnd); |
4b171585 | 430 | rc = PTR_ERR(new_dentry); |
431 | if (IS_ERR(new_dentry)) | |
b17edc10 | 432 | SGOTO(exit4, rc); |
4b171585 | 433 | |
434 | /* target should not be an ancestor of source */ | |
435 | rc = -ENOTEMPTY; | |
436 | if (new_dentry == trap) | |
b17edc10 | 437 | SGOTO(exit5, rc); |
4b171585 | 438 | |
a093c6a4 | 439 | #ifdef HAVE_4ARGS_VFS_RENAME |
4b171585 | 440 | rc = vfs_rename(old_dir->d_inode, old_dentry, |
441 | new_dir->d_inode, new_dentry); | |
a093c6a4 | 442 | #else |
21411161 BB |
443 | rc = vfs_rename(old_dir->d_inode, old_dentry, oldnd.nd_mnt, |
444 | new_dir->d_inode, new_dentry, newnd.nd_mnt); | |
a093c6a4 | 445 | #endif /* HAVE_4ARGS_VFS_RENAME */ |
4b171585 | 446 | exit5: |
447 | dput(new_dentry); | |
448 | exit4: | |
449 | dput(old_dentry); | |
450 | exit3: | |
451 | unlock_rename(new_dir, old_dir); | |
452 | exit2: | |
57d86234 | 453 | vn_path_release(&newnd); |
4b171585 | 454 | exit1: |
57d86234 | 455 | vn_path_release(&oldnd); |
4b171585 | 456 | exit: |
b17edc10 | 457 | SRETURN(-rc); |
0b3cf046 | 458 | } |
4b171585 | 459 | EXPORT_SYMBOL(vn_rename); |
0b3cf046 | 460 | |
4b171585 | 461 | int |
36e6f861 | 462 | vn_getattr(vnode_t *vp, vattr_t *vap, int flags, void *x3, void *x4) |
0b3cf046 | 463 | { |
4b171585 | 464 | struct file *fp; |
dcd9cb5a | 465 | struct kstat stat; |
4b171585 | 466 | int rc; |
b17edc10 | 467 | SENTRY; |
4b171585 | 468 | |
937879f1 | 469 | ASSERT(vp); |
470 | ASSERT(vp->v_file); | |
471 | ASSERT(vap); | |
4b171585 | 472 | |
e4f1d29f | 473 | fp = vp->v_file; |
4b171585 | 474 | |
475 | rc = vfs_getattr(fp->f_vfsmnt, fp->f_dentry, &stat); | |
476 | if (rc) | |
b17edc10 | 477 | SRETURN(-rc); |
4b171585 | 478 | |
4295b530 | 479 | vap->va_type = vn_mode_to_vtype(stat.mode); |
4b171585 | 480 | vap->va_mode = stat.mode; |
481 | vap->va_uid = stat.uid; | |
482 | vap->va_gid = stat.gid; | |
483 | vap->va_fsid = 0; | |
484 | vap->va_nodeid = stat.ino; | |
485 | vap->va_nlink = stat.nlink; | |
486 | vap->va_size = stat.size; | |
47995fa6 | 487 | vap->va_blksize = stat.blksize; |
dcd9cb5a BB |
488 | vap->va_atime = stat.atime; |
489 | vap->va_mtime = stat.mtime; | |
490 | vap->va_ctime = stat.ctime; | |
4b171585 | 491 | vap->va_rdev = stat.rdev; |
dcd9cb5a | 492 | vap->va_nblocks = stat.blocks; |
4b171585 | 493 | |
dcd9cb5a | 494 | SRETURN(0); |
0b3cf046 | 495 | } |
4b171585 | 496 | EXPORT_SYMBOL(vn_getattr); |
497 | ||
2f5d55aa | 498 | int vn_fsync(vnode_t *vp, int flags, void *x3, void *x4) |
4b171585 | 499 | { |
36e6f861 | 500 | int datasync = 0; |
b17edc10 | 501 | SENTRY; |
36e6f861 | 502 | |
937879f1 | 503 | ASSERT(vp); |
504 | ASSERT(vp->v_file); | |
4b171585 | 505 | |
36e6f861 | 506 | if (flags & FDSYNC) |
507 | datasync = 1; | |
508 | ||
b17edc10 | 509 | SRETURN(-spl_filp_fsync(vp->v_file, datasync)); |
4b171585 | 510 | } /* vn_fsync() */ |
511 | EXPORT_SYMBOL(vn_fsync); | |
af828292 | 512 | |
e4f1d29f | 513 | /* Function must be called while holding the vn_file_lock */ |
514 | static file_t * | |
515 | file_find(int fd) | |
516 | { | |
517 | file_t *fp; | |
518 | ||
937879f1 | 519 | ASSERT(spin_is_locked(&vn_file_lock)); |
e4f1d29f | 520 | |
521 | list_for_each_entry(fp, &vn_file_list, f_list) { | |
763b2f3b | 522 | if (fd == fp->f_fd && fp->f_task == current) { |
937879f1 | 523 | ASSERT(atomic_read(&fp->f_ref) != 0); |
e4f1d29f | 524 | return fp; |
525 | } | |
526 | } | |
527 | ||
528 | return NULL; | |
529 | } /* file_find() */ | |
530 | ||
531 | file_t * | |
532 | vn_getf(int fd) | |
533 | { | |
534 | struct kstat stat; | |
535 | struct file *lfp; | |
536 | file_t *fp; | |
537 | vnode_t *vp; | |
937879f1 | 538 | int rc = 0; |
b17edc10 | 539 | SENTRY; |
e4f1d29f | 540 | |
541 | /* Already open just take an extra reference */ | |
542 | spin_lock(&vn_file_lock); | |
543 | ||
544 | fp = file_find(fd); | |
545 | if (fp) { | |
546 | atomic_inc(&fp->f_ref); | |
547 | spin_unlock(&vn_file_lock); | |
b17edc10 | 548 | SRETURN(fp); |
e4f1d29f | 549 | } |
550 | ||
551 | spin_unlock(&vn_file_lock); | |
552 | ||
553 | /* File was not yet opened create the object and setup */ | |
4afaaefa | 554 | fp = kmem_cache_alloc(vn_file_cache, KM_SLEEP); |
e4f1d29f | 555 | if (fp == NULL) |
b17edc10 | 556 | SGOTO(out, rc); |
e4f1d29f | 557 | |
558 | mutex_enter(&fp->f_lock); | |
559 | ||
560 | fp->f_fd = fd; | |
763b2f3b | 561 | fp->f_task = current; |
e4f1d29f | 562 | fp->f_offset = 0; |
563 | atomic_inc(&fp->f_ref); | |
564 | ||
565 | lfp = fget(fd); | |
566 | if (lfp == NULL) | |
b17edc10 | 567 | SGOTO(out_mutex, rc); |
e4f1d29f | 568 | |
569 | vp = vn_alloc(KM_SLEEP); | |
570 | if (vp == NULL) | |
b17edc10 | 571 | SGOTO(out_fget, rc); |
e4f1d29f | 572 | |
573 | if (vfs_getattr(lfp->f_vfsmnt, lfp->f_dentry, &stat)) | |
b17edc10 | 574 | SGOTO(out_vnode, rc); |
e4f1d29f | 575 | |
576 | mutex_enter(&vp->v_lock); | |
4295b530 | 577 | vp->v_type = vn_mode_to_vtype(stat.mode); |
e4f1d29f | 578 | vp->v_file = lfp; |
579 | mutex_exit(&vp->v_lock); | |
580 | ||
581 | fp->f_vnode = vp; | |
582 | fp->f_file = lfp; | |
583 | ||
584 | /* Put it on the tracking list */ | |
585 | spin_lock(&vn_file_lock); | |
586 | list_add(&fp->f_list, &vn_file_list); | |
587 | spin_unlock(&vn_file_lock); | |
588 | ||
589 | mutex_exit(&fp->f_lock); | |
b17edc10 | 590 | SRETURN(fp); |
e4f1d29f | 591 | |
592 | out_vnode: | |
e4f1d29f | 593 | vn_free(vp); |
594 | out_fget: | |
e4f1d29f | 595 | fput(lfp); |
596 | out_mutex: | |
e4f1d29f | 597 | mutex_exit(&fp->f_lock); |
598 | kmem_cache_free(vn_file_cache, fp); | |
599 | out: | |
b17edc10 | 600 | SRETURN(NULL); |
e4f1d29f | 601 | } /* getf() */ |
602 | EXPORT_SYMBOL(getf); | |
603 | ||
604 | static void releasef_locked(file_t *fp) | |
605 | { | |
937879f1 | 606 | ASSERT(fp->f_file); |
607 | ASSERT(fp->f_vnode); | |
e4f1d29f | 608 | |
609 | /* Unlinked from list, no refs, safe to free outside mutex */ | |
610 | fput(fp->f_file); | |
611 | vn_free(fp->f_vnode); | |
612 | ||
613 | kmem_cache_free(vn_file_cache, fp); | |
614 | } | |
615 | ||
616 | void | |
617 | vn_releasef(int fd) | |
618 | { | |
619 | file_t *fp; | |
b17edc10 | 620 | SENTRY; |
e4f1d29f | 621 | |
622 | spin_lock(&vn_file_lock); | |
623 | fp = file_find(fd); | |
624 | if (fp) { | |
625 | atomic_dec(&fp->f_ref); | |
626 | if (atomic_read(&fp->f_ref) > 0) { | |
627 | spin_unlock(&vn_file_lock); | |
b17edc10 | 628 | SEXIT; |
e4f1d29f | 629 | return; |
630 | } | |
631 | ||
632 | list_del(&fp->f_list); | |
633 | releasef_locked(fp); | |
634 | } | |
635 | spin_unlock(&vn_file_lock); | |
636 | ||
b17edc10 | 637 | SEXIT; |
e4f1d29f | 638 | return; |
639 | } /* releasef() */ | |
640 | EXPORT_SYMBOL(releasef); | |
641 | ||
51a727e9 BB |
642 | #ifndef HAVE_SET_FS_PWD |
643 | # ifdef HAVE_2ARGS_SET_FS_PWD | |
644 | /* Used from 2.6.25 - 2.6.31+ */ | |
645 | void | |
646 | set_fs_pwd(struct fs_struct *fs, struct path *path) | |
647 | { | |
9b2048c2 BB |
648 | struct path old_pwd; |
649 | ||
650 | # ifdef HAVE_FS_STRUCT_SPINLOCK | |
651 | spin_lock(&fs->lock); | |
652 | old_pwd = fs->pwd; | |
653 | fs->pwd = *path; | |
654 | path_get(path); | |
655 | spin_unlock(&fs->lock); | |
656 | # else | |
657 | write_lock(&fs->lock); | |
658 | old_pwd = fs->pwd; | |
659 | fs->pwd = *path; | |
660 | path_get(path); | |
661 | write_unlock(&fs->lock); | |
662 | # endif /* HAVE_FS_STRUCT_SPINLOCK */ | |
663 | ||
664 | if (old_pwd.dentry) | |
665 | path_put(&old_pwd); | |
51a727e9 BB |
666 | } |
667 | # else | |
668 | /* Used from 2.6.11 - 2.6.24 */ | |
669 | void | |
670 | set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt, struct dentry *dentry) | |
671 | { | |
672 | struct dentry *old_pwd; | |
673 | struct vfsmount *old_pwdmnt; | |
674 | ||
675 | write_lock(&fs->lock); | |
676 | old_pwd = fs->pwd; | |
677 | old_pwdmnt = fs->pwdmnt; | |
678 | fs->pwdmnt = mntget(mnt); | |
679 | fs->pwd = dget(dentry); | |
680 | write_unlock(&fs->lock); | |
681 | ||
682 | if (old_pwd) { | |
683 | dput(old_pwd); | |
684 | mntput(old_pwdmnt); | |
685 | } | |
686 | } | |
687 | # endif /* HAVE_2ARGS_SET_FS_PWD */ | |
688 | #endif /* HAVE_SET_FS_PWD */ | |
689 | ||
690 | int | |
691 | vn_set_pwd(const char *filename) | |
692 | { | |
7119bf70 | 693 | #if defined(HAVE_2ARGS_SET_FS_PWD) && defined(HAVE_USER_PATH_DIR) |
51a727e9 | 694 | struct path path; |
82a358d9 BB |
695 | #else |
696 | struct nameidata nd; | |
697 | #endif /* HAVE_2ARGS_SET_FS_PWD */ | |
698 | mm_segment_t saved_fs; | |
51a727e9 | 699 | int rc; |
b17edc10 | 700 | SENTRY; |
51a727e9 | 701 | |
82a358d9 BB |
702 | /* |
703 | * user_path_dir() and __user_walk() both expect 'filename' to be | |
704 | * a user space address so we must briefly increase the data segment | |
705 | * size to ensure strncpy_from_user() does not fail with -EFAULT. | |
706 | */ | |
707 | saved_fs = get_fs(); | |
708 | set_fs(get_ds()); | |
709 | ||
710 | #ifdef HAVE_2ARGS_SET_FS_PWD | |
7119bf70 | 711 | # ifdef HAVE_USER_PATH_DIR |
51a727e9 BB |
712 | rc = user_path_dir(filename, &path); |
713 | if (rc) | |
b17edc10 | 714 | SGOTO(out, rc); |
51a727e9 BB |
715 | |
716 | rc = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS); | |
717 | if (rc) | |
b17edc10 | 718 | SGOTO(dput_and_out, rc); |
51a727e9 BB |
719 | |
720 | set_fs_pwd(current->fs, &path); | |
721 | ||
722 | dput_and_out: | |
723 | path_put(&path); | |
7119bf70 BB |
724 | # else |
725 | rc = __user_walk(filename, | |
726 | LOOKUP_FOLLOW|LOOKUP_DIRECTORY|LOOKUP_CHDIR, &nd); | |
727 | if (rc) | |
b17edc10 | 728 | SGOTO(out, rc); |
7119bf70 BB |
729 | |
730 | rc = vfs_permission(&nd, MAY_EXEC); | |
731 | if (rc) | |
b17edc10 | 732 | SGOTO(dput_and_out, rc); |
7119bf70 BB |
733 | |
734 | set_fs_pwd(current->fs, &nd.path); | |
735 | ||
736 | dput_and_out: | |
737 | path_put(&nd.path); | |
738 | # endif /* HAVE_USER_PATH_DIR */ | |
51a727e9 | 739 | #else |
51a727e9 BB |
740 | rc = __user_walk(filename, |
741 | LOOKUP_FOLLOW|LOOKUP_DIRECTORY|LOOKUP_CHDIR, &nd); | |
742 | if (rc) | |
b17edc10 | 743 | SGOTO(out, rc); |
51a727e9 BB |
744 | |
745 | rc = vfs_permission(&nd, MAY_EXEC); | |
746 | if (rc) | |
b17edc10 | 747 | SGOTO(dput_and_out, rc); |
51a727e9 BB |
748 | |
749 | set_fs_pwd(current->fs, nd.nd_mnt, nd.nd_dentry); | |
750 | ||
751 | dput_and_out: | |
752 | vn_path_release(&nd); | |
753 | #endif /* HAVE_2ARGS_SET_FS_PWD */ | |
754 | out: | |
82a358d9 BB |
755 | set_fs(saved_fs); |
756 | ||
b17edc10 | 757 | SRETURN(-rc); |
51a727e9 BB |
758 | } /* vn_set_pwd() */ |
759 | EXPORT_SYMBOL(vn_set_pwd); | |
760 | ||
af828292 | 761 | static int |
762 | vn_cache_constructor(void *buf, void *cdrarg, int kmflags) | |
763 | { | |
764 | struct vnode *vp = buf; | |
765 | ||
766 | mutex_init(&vp->v_lock, NULL, MUTEX_DEFAULT, NULL); | |
767 | ||
768 | return (0); | |
769 | } /* vn_cache_constructor() */ | |
770 | ||
771 | static void | |
772 | vn_cache_destructor(void *buf, void *cdrarg) | |
773 | { | |
774 | struct vnode *vp = buf; | |
775 | ||
776 | mutex_destroy(&vp->v_lock); | |
777 | } /* vn_cache_destructor() */ | |
778 | ||
e4f1d29f | 779 | static int |
780 | vn_file_cache_constructor(void *buf, void *cdrarg, int kmflags) | |
781 | { | |
782 | file_t *fp = buf; | |
783 | ||
784 | atomic_set(&fp->f_ref, 0); | |
785 | mutex_init(&fp->f_lock, NULL, MUTEX_DEFAULT, NULL); | |
4e62fd41 | 786 | INIT_LIST_HEAD(&fp->f_list); |
e4f1d29f | 787 | |
788 | return (0); | |
789 | } /* file_cache_constructor() */ | |
790 | ||
791 | static void | |
792 | vn_file_cache_destructor(void *buf, void *cdrarg) | |
793 | { | |
794 | file_t *fp = buf; | |
795 | ||
796 | mutex_destroy(&fp->f_lock); | |
797 | } /* vn_file_cache_destructor() */ | |
798 | ||
12ff95ff BB |
799 | int spl_vn_init_kallsyms_lookup(void) |
800 | { | |
801 | #ifdef HAVE_KERN_PATH_PARENT_HEADER | |
802 | #ifndef HAVE_KERN_PATH_PARENT_SYMBOL | |
803 | kern_path_parent_fn = (kern_path_parent_t) | |
804 | spl_kallsyms_lookup_name("kern_path_parent"); | |
805 | if (!kern_path_parent_fn) { | |
806 | printk(KERN_ERR "Error: Unknown symbol kern_path_parent\n"); | |
807 | return -EFAULT; | |
808 | } | |
809 | #endif /* HAVE_KERN_PATH_PARENT_SYMBOL */ | |
810 | #endif /* HAVE_KERN_PATH_PARENT_HEADER */ | |
811 | ||
812 | return (0); | |
813 | } | |
814 | ||
af828292 | 815 | int |
12ff95ff | 816 | spl_vn_init(void) |
af828292 | 817 | { |
b17edc10 | 818 | SENTRY; |
57d86234 | 819 | vn_cache = kmem_cache_create("spl_vn_cache", |
820 | sizeof(struct vnode), 64, | |
5d86345d | 821 | vn_cache_constructor, |
822 | vn_cache_destructor, | |
a5b40eed | 823 | NULL, NULL, NULL, KMC_KMEM); |
e4f1d29f | 824 | |
825 | vn_file_cache = kmem_cache_create("spl_vn_file_cache", | |
826 | sizeof(file_t), 64, | |
827 | vn_file_cache_constructor, | |
828 | vn_file_cache_destructor, | |
a5b40eed | 829 | NULL, NULL, NULL, KMC_KMEM); |
b17edc10 | 830 | SRETURN(0); |
af828292 | 831 | } /* vn_init() */ |
832 | ||
833 | void | |
12ff95ff | 834 | spl_vn_fini(void) |
af828292 | 835 | { |
e4f1d29f | 836 | file_t *fp, *next_fp; |
2fb9b26a | 837 | int leaked = 0; |
b17edc10 | 838 | SENTRY; |
e4f1d29f | 839 | |
840 | spin_lock(&vn_file_lock); | |
841 | ||
842 | list_for_each_entry_safe(fp, next_fp, &vn_file_list, f_list) { | |
843 | list_del(&fp->f_list); | |
844 | releasef_locked(fp); | |
845 | leaked++; | |
846 | } | |
847 | ||
2fb9b26a | 848 | kmem_cache_destroy(vn_file_cache); |
e4f1d29f | 849 | vn_file_cache = NULL; |
850 | spin_unlock(&vn_file_lock); | |
851 | ||
852 | if (leaked > 0) | |
b17edc10 | 853 | SWARN("Warning %d files leaked\n", leaked); |
e4f1d29f | 854 | |
2fb9b26a | 855 | kmem_cache_destroy(vn_cache); |
e4f1d29f | 856 | |
b17edc10 | 857 | SEXIT; |
e4f1d29f | 858 | return; |
af828292 | 859 | } /* vn_fini() */ |