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