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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 | |
0b3cf046 | 27 | #include <sys/sysmacros.h> |
4b171585 | 28 | #include <sys/vnode.h> |
0b3cf046 | 29 | |
937879f1 | 30 | |
31 | #ifdef DEBUG_SUBSYSTEM | |
32 | #undef DEBUG_SUBSYSTEM | |
33 | #endif | |
34 | ||
35 | #define DEBUG_SUBSYSTEM S_VNODE | |
36 | ||
51a727e9 | 37 | vnode_t *rootdir = (vnode_t *)0xabcd1234; |
4b171585 | 38 | EXPORT_SYMBOL(rootdir); |
39 | ||
7afde631 | 40 | static spl_kmem_cache_t *vn_cache; |
41 | static spl_kmem_cache_t *vn_file_cache; | |
e4f1d29f | 42 | |
43 | static spinlock_t vn_file_lock = SPIN_LOCK_UNLOCKED; | |
44 | static LIST_HEAD(vn_file_list); | |
af828292 | 45 | |
4b171585 | 46 | static vtype_t |
47 | vn_get_sol_type(umode_t mode) | |
48 | { | |
49 | if (S_ISREG(mode)) | |
50 | return VREG; | |
51 | ||
52 | if (S_ISDIR(mode)) | |
53 | return VDIR; | |
54 | ||
55 | if (S_ISCHR(mode)) | |
56 | return VCHR; | |
57 | ||
58 | if (S_ISBLK(mode)) | |
59 | return VBLK; | |
60 | ||
61 | if (S_ISFIFO(mode)) | |
62 | return VFIFO; | |
63 | ||
64 | if (S_ISLNK(mode)) | |
65 | return VLNK; | |
66 | ||
67 | if (S_ISSOCK(mode)) | |
68 | return VSOCK; | |
69 | ||
70 | if (S_ISCHR(mode)) | |
71 | return VCHR; | |
72 | ||
73 | return VNON; | |
74 | } /* vn_get_sol_type() */ | |
75 | ||
af828292 | 76 | vnode_t * |
77 | vn_alloc(int flag) | |
78 | { | |
79 | vnode_t *vp; | |
937879f1 | 80 | ENTRY; |
af828292 | 81 | |
82 | vp = kmem_cache_alloc(vn_cache, flag); | |
af828292 | 83 | if (vp != NULL) { |
e4f1d29f | 84 | vp->v_file = NULL; |
af828292 | 85 | vp->v_type = 0; |
86 | } | |
87 | ||
937879f1 | 88 | RETURN(vp); |
af828292 | 89 | } /* vn_alloc() */ |
90 | EXPORT_SYMBOL(vn_alloc); | |
91 | ||
92 | void | |
93 | vn_free(vnode_t *vp) | |
94 | { | |
937879f1 | 95 | ENTRY; |
af828292 | 96 | kmem_cache_free(vn_cache, vp); |
937879f1 | 97 | EXIT; |
af828292 | 98 | } /* vn_free() */ |
99 | EXPORT_SYMBOL(vn_free); | |
100 | ||
0b3cf046 | 101 | int |
af828292 | 102 | vn_open(const char *path, uio_seg_t seg, int flags, int mode, |
4b171585 | 103 | vnode_t **vpp, int x1, void *x2) |
0b3cf046 | 104 | { |
f7e8739c RC |
105 | struct file *fp; |
106 | struct kstat stat; | |
107 | int rc, saved_umask = 0; | |
0b3cf046 | 108 | vnode_t *vp; |
937879f1 | 109 | ENTRY; |
0b3cf046 | 110 | |
937879f1 | 111 | ASSERT(flags & (FWRITE | FREAD)); |
112 | ASSERT(seg == UIO_SYSSPACE); | |
113 | ASSERT(vpp); | |
4b171585 | 114 | *vpp = NULL; |
115 | ||
116 | if (!(flags & FCREAT) && (flags & FWRITE)) | |
117 | flags |= FEXCL; | |
118 | ||
728b9dd8 | 119 | /* Note for filp_open() the two low bits must be remapped to mean: |
120 | * 01 - read-only -> 00 read-only | |
121 | * 10 - write-only -> 01 write-only | |
122 | * 11 - read-write -> 10 read-write | |
123 | */ | |
124 | flags--; | |
0b3cf046 | 125 | |
126 | if (flags & FCREAT) | |
4b171585 | 127 | saved_umask = xchg(¤t->fs->umask, 0); |
0b3cf046 | 128 | |
f7e8739c | 129 | fp = filp_open(path, flags, mode); |
0b3cf046 | 130 | |
131 | if (flags & FCREAT) | |
4b171585 | 132 | (void)xchg(¤t->fs->umask, saved_umask); |
0b3cf046 | 133 | |
f7e8739c | 134 | if (IS_ERR(fp)) |
937879f1 | 135 | RETURN(-PTR_ERR(fp)); |
0b3cf046 | 136 | |
f7e8739c | 137 | rc = vfs_getattr(fp->f_vfsmnt, fp->f_dentry, &stat); |
4b171585 | 138 | if (rc) { |
139 | filp_close(fp, 0); | |
937879f1 | 140 | RETURN(-rc); |
0b3cf046 | 141 | } |
142 | ||
af828292 | 143 | vp = vn_alloc(KM_SLEEP); |
4b171585 | 144 | if (!vp) { |
145 | filp_close(fp, 0); | |
937879f1 | 146 | RETURN(ENOMEM); |
4b171585 | 147 | } |
0b3cf046 | 148 | |
e4f1d29f | 149 | mutex_enter(&vp->v_lock); |
4b171585 | 150 | vp->v_type = vn_get_sol_type(stat.mode); |
e4f1d29f | 151 | vp->v_file = fp; |
4b171585 | 152 | *vpp = vp; |
e4f1d29f | 153 | mutex_exit(&vp->v_lock); |
0b3cf046 | 154 | |
937879f1 | 155 | RETURN(0); |
4b171585 | 156 | } /* vn_open() */ |
157 | EXPORT_SYMBOL(vn_open); | |
0b3cf046 | 158 | |
0b3cf046 | 159 | int |
af828292 | 160 | vn_openat(const char *path, uio_seg_t seg, int flags, int mode, |
4b171585 | 161 | vnode_t **vpp, int x1, void *x2, vnode_t *vp, int fd) |
0b3cf046 | 162 | { |
4b171585 | 163 | char *realpath; |
12018327 | 164 | int len, rc; |
937879f1 | 165 | ENTRY; |
0b3cf046 | 166 | |
937879f1 | 167 | ASSERT(vp == rootdir); |
0b3cf046 | 168 | |
12018327 | 169 | len = strlen(path) + 2; |
170 | realpath = kmalloc(len, GFP_KERNEL); | |
4b171585 | 171 | if (!realpath) |
937879f1 | 172 | RETURN(ENOMEM); |
0b3cf046 | 173 | |
12018327 | 174 | (void)snprintf(realpath, len, "/%s", path); |
4b171585 | 175 | rc = vn_open(realpath, seg, flags, mode, vpp, x1, x2); |
4b171585 | 176 | kfree(realpath); |
177 | ||
937879f1 | 178 | RETURN(rc); |
4b171585 | 179 | } /* vn_openat() */ |
180 | EXPORT_SYMBOL(vn_openat); | |
0b3cf046 | 181 | |
0b3cf046 | 182 | int |
4b171585 | 183 | vn_rdwr(uio_rw_t uio, vnode_t *vp, void *addr, ssize_t len, offset_t off, |
663e02a1 | 184 | uio_seg_t seg, int ioflag, rlim64_t x2, void *x3, ssize_t *residp) |
0b3cf046 | 185 | { |
4b171585 | 186 | loff_t offset; |
187 | mm_segment_t saved_fs; | |
188 | struct file *fp; | |
189 | int rc; | |
937879f1 | 190 | ENTRY; |
4b171585 | 191 | |
937879f1 | 192 | ASSERT(uio == UIO_WRITE || uio == UIO_READ); |
193 | ASSERT(vp); | |
194 | ASSERT(vp->v_file); | |
195 | ASSERT(seg == UIO_SYSSPACE); | |
663e02a1 | 196 | ASSERT((ioflag & ~FAPPEND) == 0); |
937879f1 | 197 | ASSERT(x2 == RLIM64_INFINITY); |
4b171585 | 198 | |
e4f1d29f | 199 | fp = vp->v_file; |
4b171585 | 200 | |
663e02a1 RC |
201 | offset = off; |
202 | if (ioflag & FAPPEND) | |
203 | offset = fp->f_pos; | |
204 | ||
4b171585 | 205 | /* Writable user data segment must be briefly increased for this |
206 | * process so we can use the user space read call paths to write | |
207 | * in to memory allocated by the kernel. */ | |
208 | saved_fs = get_fs(); | |
209 | set_fs(get_ds()); | |
210 | ||
211 | if (uio & UIO_WRITE) | |
212 | rc = vfs_write(fp, addr, len, &offset); | |
213 | else | |
214 | rc = vfs_read(fp, addr, len, &offset); | |
215 | ||
216 | set_fs(saved_fs); | |
217 | ||
218 | if (rc < 0) | |
937879f1 | 219 | RETURN(-rc); |
0b3cf046 | 220 | |
4b171585 | 221 | if (residp) { |
222 | *residp = len - rc; | |
0b3cf046 | 223 | } else { |
4b171585 | 224 | if (rc != len) |
937879f1 | 225 | RETURN(EIO); |
0b3cf046 | 226 | } |
227 | ||
937879f1 | 228 | RETURN(0); |
4b171585 | 229 | } /* vn_rdwr() */ |
230 | EXPORT_SYMBOL(vn_rdwr); | |
231 | ||
232 | int | |
2f5d55aa | 233 | vn_close(vnode_t *vp, int flags, int x1, int x2, void *x3, void *x4) |
4b171585 | 234 | { |
235 | int rc; | |
937879f1 | 236 | ENTRY; |
4b171585 | 237 | |
937879f1 | 238 | ASSERT(vp); |
239 | ASSERT(vp->v_file); | |
4b171585 | 240 | |
97735c39 BB |
241 | rc = filp_close(vp->v_file, 0); |
242 | vn_free(vp); | |
4b171585 | 243 | |
937879f1 | 244 | RETURN(-rc); |
4b171585 | 245 | } /* vn_close() */ |
246 | EXPORT_SYMBOL(vn_close); | |
247 | ||
97735c39 BB |
248 | /* vn_seek() does not actually seek it only performs bounds checking on the |
249 | * proposed seek. We perform minimal checking and allow vn_rdwr() to catch | |
250 | * anything more serious. */ | |
251 | int | |
252 | vn_seek(vnode_t *vp, offset_t ooff, offset_t *noffp, caller_context_t *ct) | |
253 | { | |
254 | return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0); | |
255 | } | |
256 | EXPORT_SYMBOL(vn_seek); | |
257 | ||
258 | static struct dentry * | |
259 | vn_lookup_hash(struct nameidata *nd) | |
4b171585 | 260 | { |
57d86234 | 261 | return lookup_one_len(nd->last.name, nd->nd_dentry, nd->last.len); |
4b171585 | 262 | } /* lookup_hash() */ |
263 | ||
97735c39 BB |
264 | static void |
265 | vn_path_release(struct nameidata *nd) | |
57d86234 | 266 | { |
267 | dput(nd->nd_dentry); | |
268 | mntput(nd->nd_mnt); | |
269 | } | |
270 | ||
4b171585 | 271 | /* Modified do_unlinkat() from linux/fs/namei.c, only uses exported symbols */ |
272 | int | |
af828292 | 273 | vn_remove(const char *path, uio_seg_t seg, int flags) |
4b171585 | 274 | { |
275 | struct dentry *dentry; | |
276 | struct nameidata nd; | |
277 | struct inode *inode = NULL; | |
278 | int rc = 0; | |
3d061e9d | 279 | ENTRY; |
4b171585 | 280 | |
3d061e9d | 281 | ASSERT(seg == UIO_SYSSPACE); |
282 | ASSERT(flags == RMFILE); | |
2f5d55aa | 283 | |
4b171585 | 284 | rc = path_lookup(path, LOOKUP_PARENT, &nd); |
285 | if (rc) | |
937879f1 | 286 | GOTO(exit, rc); |
4b171585 | 287 | |
288 | rc = -EISDIR; | |
289 | if (nd.last_type != LAST_NORM) | |
937879f1 | 290 | GOTO(exit1, rc); |
4b171585 | 291 | |
3d061e9d | 292 | #ifdef HAVE_INODE_I_MUTEX |
57d86234 | 293 | mutex_lock_nested(&nd.nd_dentry->d_inode->i_mutex, I_MUTEX_PARENT); |
3d061e9d | 294 | #else |
295 | down(&nd.nd_dentry->d_inode->i_sem); | |
a093c6a4 | 296 | #endif /* HAVE_INODE_I_MUTEX */ |
57d86234 | 297 | dentry = vn_lookup_hash(&nd); |
4b171585 | 298 | rc = PTR_ERR(dentry); |
299 | if (!IS_ERR(dentry)) { | |
300 | /* Why not before? Because we want correct rc value */ | |
301 | if (nd.last.name[nd.last.len]) | |
937879f1 | 302 | GOTO(slashes, rc); |
303 | ||
4b171585 | 304 | inode = dentry->d_inode; |
305 | if (inode) | |
306 | atomic_inc(&inode->i_count); | |
a093c6a4 | 307 | #ifdef HAVE_2ARGS_VFS_UNLINK |
57d86234 | 308 | rc = vfs_unlink(nd.nd_dentry->d_inode, dentry); |
a093c6a4 | 309 | #else |
21411161 | 310 | rc = vfs_unlink(nd.nd_dentry->d_inode, dentry, nd.nd_mnt); |
a093c6a4 | 311 | #endif /* HAVE_2ARGS_VFS_UNLINK */ |
4b171585 | 312 | exit2: |
313 | dput(dentry); | |
314 | } | |
3d061e9d | 315 | #ifdef HAVE_INODE_I_MUTEX |
57d86234 | 316 | mutex_unlock(&nd.nd_dentry->d_inode->i_mutex); |
3d061e9d | 317 | #else |
318 | up(&nd.nd_dentry->d_inode->i_sem); | |
a093c6a4 | 319 | #endif /* HAVE_INODE_I_MUTEX */ |
4b171585 | 320 | if (inode) |
321 | iput(inode); /* truncate the inode here */ | |
322 | exit1: | |
57d86234 | 323 | vn_path_release(&nd); |
4b171585 | 324 | exit: |
937879f1 | 325 | RETURN(-rc); |
4b171585 | 326 | |
327 | slashes: | |
328 | rc = !dentry->d_inode ? -ENOENT : | |
329 | S_ISDIR(dentry->d_inode->i_mode) ? -EISDIR : -ENOTDIR; | |
937879f1 | 330 | GOTO(exit2, rc); |
4b171585 | 331 | } /* vn_remove() */ |
332 | EXPORT_SYMBOL(vn_remove); | |
333 | ||
334 | /* Modified do_rename() from linux/fs/namei.c, only uses exported symbols */ | |
335 | int | |
336 | vn_rename(const char *oldname, const char *newname, int x1) | |
337 | { | |
a093c6a4 BB |
338 | struct dentry *old_dir, *new_dir; |
339 | struct dentry *old_dentry, *new_dentry; | |
340 | struct dentry *trap; | |
4b171585 | 341 | struct nameidata oldnd, newnd; |
342 | int rc = 0; | |
937879f1 | 343 | ENTRY; |
4b171585 | 344 | |
345 | rc = path_lookup(oldname, LOOKUP_PARENT, &oldnd); | |
346 | if (rc) | |
937879f1 | 347 | GOTO(exit, rc); |
4b171585 | 348 | |
349 | rc = path_lookup(newname, LOOKUP_PARENT, &newnd); | |
350 | if (rc) | |
937879f1 | 351 | GOTO(exit1, rc); |
4b171585 | 352 | |
353 | rc = -EXDEV; | |
57d86234 | 354 | if (oldnd.nd_mnt != newnd.nd_mnt) |
937879f1 | 355 | GOTO(exit2, rc); |
4b171585 | 356 | |
57d86234 | 357 | old_dir = oldnd.nd_dentry; |
4b171585 | 358 | rc = -EBUSY; |
359 | if (oldnd.last_type != LAST_NORM) | |
937879f1 | 360 | GOTO(exit2, rc); |
4b171585 | 361 | |
57d86234 | 362 | new_dir = newnd.nd_dentry; |
4b171585 | 363 | if (newnd.last_type != LAST_NORM) |
937879f1 | 364 | GOTO(exit2, rc); |
4b171585 | 365 | |
366 | trap = lock_rename(new_dir, old_dir); | |
367 | ||
57d86234 | 368 | old_dentry = vn_lookup_hash(&oldnd); |
4b171585 | 369 | |
370 | rc = PTR_ERR(old_dentry); | |
371 | if (IS_ERR(old_dentry)) | |
937879f1 | 372 | GOTO(exit3, rc); |
4b171585 | 373 | |
374 | /* source must exist */ | |
375 | rc = -ENOENT; | |
376 | if (!old_dentry->d_inode) | |
937879f1 | 377 | GOTO(exit4, rc); |
4b171585 | 378 | |
379 | /* unless the source is a directory trailing slashes give -ENOTDIR */ | |
380 | if (!S_ISDIR(old_dentry->d_inode->i_mode)) { | |
381 | rc = -ENOTDIR; | |
382 | if (oldnd.last.name[oldnd.last.len]) | |
937879f1 | 383 | GOTO(exit4, rc); |
4b171585 | 384 | if (newnd.last.name[newnd.last.len]) |
937879f1 | 385 | GOTO(exit4, rc); |
4b171585 | 386 | } |
387 | ||
388 | /* source should not be ancestor of target */ | |
389 | rc = -EINVAL; | |
390 | if (old_dentry == trap) | |
937879f1 | 391 | GOTO(exit4, rc); |
4b171585 | 392 | |
57d86234 | 393 | new_dentry = vn_lookup_hash(&newnd); |
4b171585 | 394 | rc = PTR_ERR(new_dentry); |
395 | if (IS_ERR(new_dentry)) | |
937879f1 | 396 | GOTO(exit4, rc); |
4b171585 | 397 | |
398 | /* target should not be an ancestor of source */ | |
399 | rc = -ENOTEMPTY; | |
400 | if (new_dentry == trap) | |
937879f1 | 401 | GOTO(exit5, rc); |
4b171585 | 402 | |
a093c6a4 | 403 | #ifdef HAVE_4ARGS_VFS_RENAME |
4b171585 | 404 | rc = vfs_rename(old_dir->d_inode, old_dentry, |
405 | new_dir->d_inode, new_dentry); | |
a093c6a4 | 406 | #else |
21411161 BB |
407 | rc = vfs_rename(old_dir->d_inode, old_dentry, oldnd.nd_mnt, |
408 | new_dir->d_inode, new_dentry, newnd.nd_mnt); | |
a093c6a4 | 409 | #endif /* HAVE_4ARGS_VFS_RENAME */ |
4b171585 | 410 | exit5: |
411 | dput(new_dentry); | |
412 | exit4: | |
413 | dput(old_dentry); | |
414 | exit3: | |
415 | unlock_rename(new_dir, old_dir); | |
416 | exit2: | |
57d86234 | 417 | vn_path_release(&newnd); |
4b171585 | 418 | exit1: |
57d86234 | 419 | vn_path_release(&oldnd); |
4b171585 | 420 | exit: |
937879f1 | 421 | RETURN(-rc); |
0b3cf046 | 422 | } |
4b171585 | 423 | EXPORT_SYMBOL(vn_rename); |
0b3cf046 | 424 | |
4b171585 | 425 | int |
36e6f861 | 426 | vn_getattr(vnode_t *vp, vattr_t *vap, int flags, void *x3, void *x4) |
0b3cf046 | 427 | { |
4b171585 | 428 | struct file *fp; |
429 | struct kstat stat; | |
430 | int rc; | |
937879f1 | 431 | ENTRY; |
4b171585 | 432 | |
937879f1 | 433 | ASSERT(vp); |
434 | ASSERT(vp->v_file); | |
435 | ASSERT(vap); | |
4b171585 | 436 | |
e4f1d29f | 437 | fp = vp->v_file; |
4b171585 | 438 | |
439 | rc = vfs_getattr(fp->f_vfsmnt, fp->f_dentry, &stat); | |
440 | if (rc) | |
937879f1 | 441 | RETURN(-rc); |
4b171585 | 442 | |
443 | vap->va_type = vn_get_sol_type(stat.mode); | |
444 | vap->va_mode = stat.mode; | |
445 | vap->va_uid = stat.uid; | |
446 | vap->va_gid = stat.gid; | |
447 | vap->va_fsid = 0; | |
448 | vap->va_nodeid = stat.ino; | |
449 | vap->va_nlink = stat.nlink; | |
450 | vap->va_size = stat.size; | |
451 | vap->va_blocksize = stat.blksize; | |
452 | vap->va_atime.tv_sec = stat.atime.tv_sec; | |
453 | vap->va_atime.tv_usec = stat.atime.tv_nsec / NSEC_PER_USEC; | |
454 | vap->va_mtime.tv_sec = stat.mtime.tv_sec; | |
455 | vap->va_mtime.tv_usec = stat.mtime.tv_nsec / NSEC_PER_USEC; | |
456 | vap->va_ctime.tv_sec = stat.ctime.tv_sec; | |
457 | vap->va_ctime.tv_usec = stat.ctime.tv_nsec / NSEC_PER_USEC; | |
458 | vap->va_rdev = stat.rdev; | |
459 | vap->va_blocks = stat.blocks; | |
460 | ||
937879f1 | 461 | RETURN(0); |
0b3cf046 | 462 | } |
4b171585 | 463 | EXPORT_SYMBOL(vn_getattr); |
464 | ||
2f5d55aa | 465 | int vn_fsync(vnode_t *vp, int flags, void *x3, void *x4) |
4b171585 | 466 | { |
36e6f861 | 467 | int datasync = 0; |
937879f1 | 468 | ENTRY; |
36e6f861 | 469 | |
937879f1 | 470 | ASSERT(vp); |
471 | ASSERT(vp->v_file); | |
4b171585 | 472 | |
36e6f861 | 473 | if (flags & FDSYNC) |
474 | datasync = 1; | |
475 | ||
f0ff89fc | 476 | RETURN(-spl_filp_fsync(vp->v_file, datasync)); |
4b171585 | 477 | } /* vn_fsync() */ |
478 | EXPORT_SYMBOL(vn_fsync); | |
af828292 | 479 | |
e4f1d29f | 480 | /* Function must be called while holding the vn_file_lock */ |
481 | static file_t * | |
482 | file_find(int fd) | |
483 | { | |
484 | file_t *fp; | |
485 | ||
937879f1 | 486 | ASSERT(spin_is_locked(&vn_file_lock)); |
e4f1d29f | 487 | |
488 | list_for_each_entry(fp, &vn_file_list, f_list) { | |
489 | if (fd == fp->f_fd) { | |
937879f1 | 490 | ASSERT(atomic_read(&fp->f_ref) != 0); |
e4f1d29f | 491 | return fp; |
492 | } | |
493 | } | |
494 | ||
495 | return NULL; | |
496 | } /* file_find() */ | |
497 | ||
498 | file_t * | |
499 | vn_getf(int fd) | |
500 | { | |
501 | struct kstat stat; | |
502 | struct file *lfp; | |
503 | file_t *fp; | |
504 | vnode_t *vp; | |
937879f1 | 505 | int rc = 0; |
506 | ENTRY; | |
e4f1d29f | 507 | |
508 | /* Already open just take an extra reference */ | |
509 | spin_lock(&vn_file_lock); | |
510 | ||
511 | fp = file_find(fd); | |
512 | if (fp) { | |
513 | atomic_inc(&fp->f_ref); | |
514 | spin_unlock(&vn_file_lock); | |
937879f1 | 515 | RETURN(fp); |
e4f1d29f | 516 | } |
517 | ||
518 | spin_unlock(&vn_file_lock); | |
519 | ||
520 | /* File was not yet opened create the object and setup */ | |
4afaaefa | 521 | fp = kmem_cache_alloc(vn_file_cache, KM_SLEEP); |
e4f1d29f | 522 | if (fp == NULL) |
937879f1 | 523 | GOTO(out, rc); |
e4f1d29f | 524 | |
525 | mutex_enter(&fp->f_lock); | |
526 | ||
527 | fp->f_fd = fd; | |
528 | fp->f_offset = 0; | |
529 | atomic_inc(&fp->f_ref); | |
530 | ||
531 | lfp = fget(fd); | |
532 | if (lfp == NULL) | |
937879f1 | 533 | GOTO(out_mutex, rc); |
e4f1d29f | 534 | |
535 | vp = vn_alloc(KM_SLEEP); | |
536 | if (vp == NULL) | |
937879f1 | 537 | GOTO(out_fget, rc); |
e4f1d29f | 538 | |
539 | if (vfs_getattr(lfp->f_vfsmnt, lfp->f_dentry, &stat)) | |
937879f1 | 540 | GOTO(out_vnode, rc); |
e4f1d29f | 541 | |
542 | mutex_enter(&vp->v_lock); | |
543 | vp->v_type = vn_get_sol_type(stat.mode); | |
544 | vp->v_file = lfp; | |
545 | mutex_exit(&vp->v_lock); | |
546 | ||
547 | fp->f_vnode = vp; | |
548 | fp->f_file = lfp; | |
549 | ||
550 | /* Put it on the tracking list */ | |
551 | spin_lock(&vn_file_lock); | |
552 | list_add(&fp->f_list, &vn_file_list); | |
553 | spin_unlock(&vn_file_lock); | |
554 | ||
555 | mutex_exit(&fp->f_lock); | |
937879f1 | 556 | RETURN(fp); |
e4f1d29f | 557 | |
558 | out_vnode: | |
e4f1d29f | 559 | vn_free(vp); |
560 | out_fget: | |
e4f1d29f | 561 | fput(lfp); |
562 | out_mutex: | |
e4f1d29f | 563 | mutex_exit(&fp->f_lock); |
564 | kmem_cache_free(vn_file_cache, fp); | |
565 | out: | |
937879f1 | 566 | RETURN(NULL); |
e4f1d29f | 567 | } /* getf() */ |
568 | EXPORT_SYMBOL(getf); | |
569 | ||
570 | static void releasef_locked(file_t *fp) | |
571 | { | |
937879f1 | 572 | ASSERT(fp->f_file); |
573 | ASSERT(fp->f_vnode); | |
e4f1d29f | 574 | |
575 | /* Unlinked from list, no refs, safe to free outside mutex */ | |
576 | fput(fp->f_file); | |
577 | vn_free(fp->f_vnode); | |
578 | ||
579 | kmem_cache_free(vn_file_cache, fp); | |
580 | } | |
581 | ||
582 | void | |
583 | vn_releasef(int fd) | |
584 | { | |
585 | file_t *fp; | |
937879f1 | 586 | ENTRY; |
e4f1d29f | 587 | |
588 | spin_lock(&vn_file_lock); | |
589 | fp = file_find(fd); | |
590 | if (fp) { | |
591 | atomic_dec(&fp->f_ref); | |
592 | if (atomic_read(&fp->f_ref) > 0) { | |
593 | spin_unlock(&vn_file_lock); | |
937879f1 | 594 | EXIT; |
e4f1d29f | 595 | return; |
596 | } | |
597 | ||
598 | list_del(&fp->f_list); | |
599 | releasef_locked(fp); | |
600 | } | |
601 | spin_unlock(&vn_file_lock); | |
602 | ||
937879f1 | 603 | EXIT; |
e4f1d29f | 604 | return; |
605 | } /* releasef() */ | |
606 | EXPORT_SYMBOL(releasef); | |
607 | ||
51a727e9 BB |
608 | #ifndef HAVE_SET_FS_PWD |
609 | # ifdef HAVE_2ARGS_SET_FS_PWD | |
610 | /* Used from 2.6.25 - 2.6.31+ */ | |
611 | void | |
612 | set_fs_pwd(struct fs_struct *fs, struct path *path) | |
613 | { | |
614 | struct path old_pwd; | |
615 | ||
616 | write_lock(&fs->lock); | |
617 | old_pwd = fs->pwd; | |
618 | fs->pwd = *path; | |
619 | path_get(path); | |
620 | write_unlock(&fs->lock); | |
621 | ||
622 | if (old_pwd.dentry) | |
623 | path_put(&old_pwd); | |
624 | } | |
625 | # else | |
626 | /* Used from 2.6.11 - 2.6.24 */ | |
627 | void | |
628 | set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt, struct dentry *dentry) | |
629 | { | |
630 | struct dentry *old_pwd; | |
631 | struct vfsmount *old_pwdmnt; | |
632 | ||
633 | write_lock(&fs->lock); | |
634 | old_pwd = fs->pwd; | |
635 | old_pwdmnt = fs->pwdmnt; | |
636 | fs->pwdmnt = mntget(mnt); | |
637 | fs->pwd = dget(dentry); | |
638 | write_unlock(&fs->lock); | |
639 | ||
640 | if (old_pwd) { | |
641 | dput(old_pwd); | |
642 | mntput(old_pwdmnt); | |
643 | } | |
644 | } | |
645 | # endif /* HAVE_2ARGS_SET_FS_PWD */ | |
646 | #endif /* HAVE_SET_FS_PWD */ | |
647 | ||
648 | int | |
649 | vn_set_pwd(const char *filename) | |
650 | { | |
7119bf70 | 651 | #if defined(HAVE_2ARGS_SET_FS_PWD) && defined(HAVE_USER_PATH_DIR) |
51a727e9 | 652 | struct path path; |
82a358d9 BB |
653 | #else |
654 | struct nameidata nd; | |
655 | #endif /* HAVE_2ARGS_SET_FS_PWD */ | |
656 | mm_segment_t saved_fs; | |
51a727e9 BB |
657 | int rc; |
658 | ENTRY; | |
659 | ||
82a358d9 BB |
660 | /* |
661 | * user_path_dir() and __user_walk() both expect 'filename' to be | |
662 | * a user space address so we must briefly increase the data segment | |
663 | * size to ensure strncpy_from_user() does not fail with -EFAULT. | |
664 | */ | |
665 | saved_fs = get_fs(); | |
666 | set_fs(get_ds()); | |
667 | ||
668 | #ifdef HAVE_2ARGS_SET_FS_PWD | |
7119bf70 | 669 | # ifdef HAVE_USER_PATH_DIR |
51a727e9 BB |
670 | rc = user_path_dir(filename, &path); |
671 | if (rc) | |
672 | GOTO(out, rc); | |
673 | ||
674 | rc = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS); | |
675 | if (rc) | |
676 | GOTO(dput_and_out, rc); | |
677 | ||
678 | set_fs_pwd(current->fs, &path); | |
679 | ||
680 | dput_and_out: | |
681 | path_put(&path); | |
7119bf70 BB |
682 | # else |
683 | rc = __user_walk(filename, | |
684 | LOOKUP_FOLLOW|LOOKUP_DIRECTORY|LOOKUP_CHDIR, &nd); | |
685 | if (rc) | |
686 | GOTO(out, rc); | |
687 | ||
688 | rc = vfs_permission(&nd, MAY_EXEC); | |
689 | if (rc) | |
690 | GOTO(dput_and_out, rc); | |
691 | ||
692 | set_fs_pwd(current->fs, &nd.path); | |
693 | ||
694 | dput_and_out: | |
695 | path_put(&nd.path); | |
696 | # endif /* HAVE_USER_PATH_DIR */ | |
51a727e9 | 697 | #else |
51a727e9 BB |
698 | rc = __user_walk(filename, |
699 | LOOKUP_FOLLOW|LOOKUP_DIRECTORY|LOOKUP_CHDIR, &nd); | |
700 | if (rc) | |
701 | GOTO(out, rc); | |
702 | ||
703 | rc = vfs_permission(&nd, MAY_EXEC); | |
704 | if (rc) | |
705 | GOTO(dput_and_out, rc); | |
706 | ||
707 | set_fs_pwd(current->fs, nd.nd_mnt, nd.nd_dentry); | |
708 | ||
709 | dput_and_out: | |
710 | vn_path_release(&nd); | |
711 | #endif /* HAVE_2ARGS_SET_FS_PWD */ | |
712 | out: | |
82a358d9 BB |
713 | set_fs(saved_fs); |
714 | ||
51a727e9 BB |
715 | RETURN(-rc); |
716 | } /* vn_set_pwd() */ | |
717 | EXPORT_SYMBOL(vn_set_pwd); | |
718 | ||
af828292 | 719 | static int |
720 | vn_cache_constructor(void *buf, void *cdrarg, int kmflags) | |
721 | { | |
722 | struct vnode *vp = buf; | |
723 | ||
724 | mutex_init(&vp->v_lock, NULL, MUTEX_DEFAULT, NULL); | |
725 | ||
726 | return (0); | |
727 | } /* vn_cache_constructor() */ | |
728 | ||
729 | static void | |
730 | vn_cache_destructor(void *buf, void *cdrarg) | |
731 | { | |
732 | struct vnode *vp = buf; | |
733 | ||
734 | mutex_destroy(&vp->v_lock); | |
735 | } /* vn_cache_destructor() */ | |
736 | ||
e4f1d29f | 737 | static int |
738 | vn_file_cache_constructor(void *buf, void *cdrarg, int kmflags) | |
739 | { | |
740 | file_t *fp = buf; | |
741 | ||
742 | atomic_set(&fp->f_ref, 0); | |
743 | mutex_init(&fp->f_lock, NULL, MUTEX_DEFAULT, NULL); | |
4e62fd41 | 744 | INIT_LIST_HEAD(&fp->f_list); |
e4f1d29f | 745 | |
746 | return (0); | |
747 | } /* file_cache_constructor() */ | |
748 | ||
749 | static void | |
750 | vn_file_cache_destructor(void *buf, void *cdrarg) | |
751 | { | |
752 | file_t *fp = buf; | |
753 | ||
754 | mutex_destroy(&fp->f_lock); | |
755 | } /* vn_file_cache_destructor() */ | |
756 | ||
af828292 | 757 | int |
758 | vn_init(void) | |
759 | { | |
937879f1 | 760 | ENTRY; |
57d86234 | 761 | vn_cache = kmem_cache_create("spl_vn_cache", |
762 | sizeof(struct vnode), 64, | |
5d86345d | 763 | vn_cache_constructor, |
764 | vn_cache_destructor, | |
af828292 | 765 | NULL, NULL, NULL, 0); |
e4f1d29f | 766 | |
767 | vn_file_cache = kmem_cache_create("spl_vn_file_cache", | |
768 | sizeof(file_t), 64, | |
769 | vn_file_cache_constructor, | |
770 | vn_file_cache_destructor, | |
771 | NULL, NULL, NULL, 0); | |
937879f1 | 772 | RETURN(0); |
af828292 | 773 | } /* vn_init() */ |
774 | ||
775 | void | |
776 | vn_fini(void) | |
777 | { | |
e4f1d29f | 778 | file_t *fp, *next_fp; |
2fb9b26a | 779 | int leaked = 0; |
937879f1 | 780 | ENTRY; |
e4f1d29f | 781 | |
782 | spin_lock(&vn_file_lock); | |
783 | ||
784 | list_for_each_entry_safe(fp, next_fp, &vn_file_list, f_list) { | |
785 | list_del(&fp->f_list); | |
786 | releasef_locked(fp); | |
787 | leaked++; | |
788 | } | |
789 | ||
2fb9b26a | 790 | kmem_cache_destroy(vn_file_cache); |
e4f1d29f | 791 | vn_file_cache = NULL; |
792 | spin_unlock(&vn_file_lock); | |
793 | ||
794 | if (leaked > 0) | |
937879f1 | 795 | CWARN("Warning %d files leaked\n", leaked); |
e4f1d29f | 796 | |
2fb9b26a | 797 | kmem_cache_destroy(vn_cache); |
e4f1d29f | 798 | |
937879f1 | 799 | EXIT; |
e4f1d29f | 800 | return; |
af828292 | 801 | } /* vn_fini() */ |