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Commit | Line | Data |
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0b3cf046 | 1 | #include <sys/sysmacros.h> |
4b171585 | 2 | #include <sys/vnode.h> |
0b3cf046 | 3 | #include "config.h" |
4 | ||
4b171585 | 5 | void *rootdir = NULL; |
6 | EXPORT_SYMBOL(rootdir); | |
7 | ||
8 | static vtype_t | |
9 | vn_get_sol_type(umode_t mode) | |
10 | { | |
11 | if (S_ISREG(mode)) | |
12 | return VREG; | |
13 | ||
14 | if (S_ISDIR(mode)) | |
15 | return VDIR; | |
16 | ||
17 | if (S_ISCHR(mode)) | |
18 | return VCHR; | |
19 | ||
20 | if (S_ISBLK(mode)) | |
21 | return VBLK; | |
22 | ||
23 | if (S_ISFIFO(mode)) | |
24 | return VFIFO; | |
25 | ||
26 | if (S_ISLNK(mode)) | |
27 | return VLNK; | |
28 | ||
29 | if (S_ISSOCK(mode)) | |
30 | return VSOCK; | |
31 | ||
32 | if (S_ISCHR(mode)) | |
33 | return VCHR; | |
34 | ||
35 | return VNON; | |
36 | } /* vn_get_sol_type() */ | |
37 | ||
0b3cf046 | 38 | int |
4b171585 | 39 | vn_open(const char *path, int seg, int flags, int mode, |
40 | vnode_t **vpp, int x1, void *x2) | |
0b3cf046 | 41 | { |
4b171585 | 42 | struct file *fp; |
43 | struct kstat stat; | |
44 | int rc, saved_umask, flags_rw; | |
0b3cf046 | 45 | vnode_t *vp; |
0b3cf046 | 46 | |
4b171585 | 47 | BUG_ON(seg != UIO_SYSSPACE); |
48 | BUG_ON(!vpp); | |
49 | *vpp = NULL; | |
50 | ||
51 | if (!(flags & FCREAT) && (flags & FWRITE)) | |
52 | flags |= FEXCL; | |
53 | ||
54 | flags_rw = flags & (FWRITE | FREAD); | |
55 | flags &= ~(FWRITE | FREAD); | |
56 | switch (flags_rw) { | |
57 | case FWRITE: flags |= O_WRONLY; | |
58 | case FREAD: flags |= O_RDONLY; | |
59 | case (FWRITE | FREAD): flags |= O_RDWR; | |
0b3cf046 | 60 | } |
0b3cf046 | 61 | |
62 | if (flags & FCREAT) | |
4b171585 | 63 | saved_umask = xchg(¤t->fs->umask, 0); |
0b3cf046 | 64 | |
4b171585 | 65 | fp = filp_open(path, flags, mode); |
0b3cf046 | 66 | |
67 | if (flags & FCREAT) | |
4b171585 | 68 | (void)xchg(¤t->fs->umask, saved_umask); |
0b3cf046 | 69 | |
4b171585 | 70 | if (IS_ERR(fp)) |
71 | return PTR_ERR(fp); | |
0b3cf046 | 72 | |
4b171585 | 73 | rc = vfs_getattr(fp->f_vfsmnt, fp->f_dentry, &stat); |
74 | if (rc) { | |
75 | filp_close(fp, 0); | |
76 | return rc; | |
0b3cf046 | 77 | } |
78 | ||
4b171585 | 79 | vp = kmalloc(sizeof(vnode_t), GFP_ATOMIC); |
80 | if (!vp) { | |
81 | filp_close(fp, 0); | |
82 | return -ENOMEM; | |
83 | } | |
0b3cf046 | 84 | |
4b171585 | 85 | vp->v_type = vn_get_sol_type(stat.mode); |
86 | vp->v_fp = fp; | |
87 | *vpp = vp; | |
0b3cf046 | 88 | |
4b171585 | 89 | return 0; |
90 | } /* vn_open() */ | |
91 | EXPORT_SYMBOL(vn_open); | |
0b3cf046 | 92 | |
0b3cf046 | 93 | int |
4b171585 | 94 | vn_openat(const char *path, int seg, int flags, int mode, |
95 | vnode_t **vpp, int x1, void *x2, vnode_t *vp, int fd) | |
0b3cf046 | 96 | { |
4b171585 | 97 | char *realpath; |
98 | int rc; | |
0b3cf046 | 99 | |
4b171585 | 100 | BUG_ON(vp != rootdir); |
0b3cf046 | 101 | |
4b171585 | 102 | realpath = kmalloc(strlen(path) + 2, GFP_KERNEL); |
103 | if (!realpath) | |
104 | return -ENOMEM; | |
0b3cf046 | 105 | |
4b171585 | 106 | sprintf(realpath, "/%s", path); |
107 | rc = vn_open(realpath, seg, flags, mode, vpp, x1, x2); | |
0b3cf046 | 108 | |
4b171585 | 109 | kfree(realpath); |
110 | ||
111 | return rc; | |
112 | } /* vn_openat() */ | |
113 | EXPORT_SYMBOL(vn_openat); | |
0b3cf046 | 114 | |
0b3cf046 | 115 | int |
4b171585 | 116 | vn_rdwr(uio_rw_t uio, vnode_t *vp, void *addr, ssize_t len, offset_t off, |
117 | int seg, int x1, rlim64_t x2, void *x3, ssize_t *residp) | |
0b3cf046 | 118 | { |
4b171585 | 119 | loff_t offset; |
120 | mm_segment_t saved_fs; | |
121 | struct file *fp; | |
122 | int rc; | |
123 | ||
124 | BUG_ON(!(uio == UIO_WRITE || uio == UIO_READ)); | |
125 | BUG_ON(!vp); | |
126 | BUG_ON(!vp->v_fp); | |
127 | BUG_ON(seg != UIO_SYSSPACE); | |
128 | BUG_ON(x1 != 0); | |
129 | BUG_ON(x2 != RLIM64_INFINITY); | |
130 | ||
131 | offset = off; | |
132 | fp = vp->v_fp; | |
133 | ||
134 | /* Writable user data segment must be briefly increased for this | |
135 | * process so we can use the user space read call paths to write | |
136 | * in to memory allocated by the kernel. */ | |
137 | saved_fs = get_fs(); | |
138 | set_fs(get_ds()); | |
139 | ||
140 | if (uio & UIO_WRITE) | |
141 | rc = vfs_write(fp, addr, len, &offset); | |
142 | else | |
143 | rc = vfs_read(fp, addr, len, &offset); | |
144 | ||
145 | set_fs(saved_fs); | |
146 | ||
147 | if (rc < 0) | |
148 | return rc; | |
0b3cf046 | 149 | |
4b171585 | 150 | if (residp) { |
151 | *residp = len - rc; | |
0b3cf046 | 152 | } else { |
4b171585 | 153 | if (rc != len) |
154 | return -EIO; | |
0b3cf046 | 155 | } |
156 | ||
4b171585 | 157 | return 0; |
158 | } /* vn_rdwr() */ | |
159 | EXPORT_SYMBOL(vn_rdwr); | |
160 | ||
161 | int | |
2f5d55aa | 162 | vn_close(vnode_t *vp, int flags, int x1, int x2, void *x3, void *x4) |
4b171585 | 163 | { |
164 | int rc; | |
165 | ||
166 | BUG_ON(!vp); | |
167 | BUG_ON(!vp->v_fp); | |
168 | ||
169 | rc = filp_close(vp->v_fp, 0); | |
170 | kfree(vp); | |
171 | ||
172 | return rc; | |
173 | } /* vn_close() */ | |
174 | EXPORT_SYMBOL(vn_close); | |
175 | ||
176 | static struct dentry *lookup_hash(struct nameidata *nd) | |
177 | { | |
178 | return __lookup_hash(&nd->last, nd->dentry, nd); | |
179 | } /* lookup_hash() */ | |
180 | ||
181 | /* Modified do_unlinkat() from linux/fs/namei.c, only uses exported symbols */ | |
182 | int | |
2f5d55aa | 183 | vn_remove(const char *path, int seg, int flags) |
4b171585 | 184 | { |
185 | struct dentry *dentry; | |
186 | struct nameidata nd; | |
187 | struct inode *inode = NULL; | |
188 | int rc = 0; | |
189 | ||
2f5d55aa | 190 | BUG_ON(seg != UIO_SYSSPACE); |
191 | BUG_ON(flags != RMFILE); | |
192 | ||
4b171585 | 193 | rc = path_lookup(path, LOOKUP_PARENT, &nd); |
194 | if (rc) | |
195 | goto exit; | |
196 | ||
197 | rc = -EISDIR; | |
198 | if (nd.last_type != LAST_NORM) | |
199 | goto exit1; | |
200 | ||
201 | mutex_lock_nested(&nd.dentry->d_inode->i_mutex, I_MUTEX_PARENT); | |
202 | dentry = lookup_hash(&nd); | |
203 | rc = PTR_ERR(dentry); | |
204 | if (!IS_ERR(dentry)) { | |
205 | /* Why not before? Because we want correct rc value */ | |
206 | if (nd.last.name[nd.last.len]) | |
207 | goto slashes; | |
208 | inode = dentry->d_inode; | |
209 | if (inode) | |
210 | atomic_inc(&inode->i_count); | |
211 | rc = vfs_unlink(nd.dentry->d_inode, dentry); | |
212 | exit2: | |
213 | dput(dentry); | |
214 | } | |
215 | mutex_unlock(&nd.dentry->d_inode->i_mutex); | |
216 | if (inode) | |
217 | iput(inode); /* truncate the inode here */ | |
218 | exit1: | |
219 | path_release(&nd); | |
220 | exit: | |
221 | return rc; | |
222 | ||
223 | slashes: | |
224 | rc = !dentry->d_inode ? -ENOENT : | |
225 | S_ISDIR(dentry->d_inode->i_mode) ? -EISDIR : -ENOTDIR; | |
226 | goto exit2; | |
227 | } /* vn_remove() */ | |
228 | EXPORT_SYMBOL(vn_remove); | |
229 | ||
230 | /* Modified do_rename() from linux/fs/namei.c, only uses exported symbols */ | |
231 | int | |
232 | vn_rename(const char *oldname, const char *newname, int x1) | |
233 | { | |
234 | struct dentry * old_dir, * new_dir; | |
235 | struct dentry * old_dentry, *new_dentry; | |
236 | struct dentry * trap; | |
237 | struct nameidata oldnd, newnd; | |
238 | int rc = 0; | |
239 | ||
240 | rc = path_lookup(oldname, LOOKUP_PARENT, &oldnd); | |
241 | if (rc) | |
242 | goto exit; | |
243 | ||
244 | rc = path_lookup(newname, LOOKUP_PARENT, &newnd); | |
245 | if (rc) | |
246 | goto exit1; | |
247 | ||
248 | rc = -EXDEV; | |
249 | if (oldnd.mnt != newnd.mnt) | |
250 | goto exit2; | |
251 | ||
252 | old_dir = oldnd.dentry; | |
253 | rc = -EBUSY; | |
254 | if (oldnd.last_type != LAST_NORM) | |
255 | goto exit2; | |
256 | ||
257 | new_dir = newnd.dentry; | |
258 | if (newnd.last_type != LAST_NORM) | |
259 | goto exit2; | |
260 | ||
261 | trap = lock_rename(new_dir, old_dir); | |
262 | ||
263 | old_dentry = lookup_hash(&oldnd); | |
264 | ||
265 | rc = PTR_ERR(old_dentry); | |
266 | if (IS_ERR(old_dentry)) | |
267 | goto exit3; | |
268 | ||
269 | /* source must exist */ | |
270 | rc = -ENOENT; | |
271 | if (!old_dentry->d_inode) | |
272 | goto exit4; | |
273 | ||
274 | /* unless the source is a directory trailing slashes give -ENOTDIR */ | |
275 | if (!S_ISDIR(old_dentry->d_inode->i_mode)) { | |
276 | rc = -ENOTDIR; | |
277 | if (oldnd.last.name[oldnd.last.len]) | |
278 | goto exit4; | |
279 | if (newnd.last.name[newnd.last.len]) | |
280 | goto exit4; | |
281 | } | |
282 | ||
283 | /* source should not be ancestor of target */ | |
284 | rc = -EINVAL; | |
285 | if (old_dentry == trap) | |
286 | goto exit4; | |
287 | ||
288 | new_dentry = lookup_hash(&newnd); | |
289 | rc = PTR_ERR(new_dentry); | |
290 | if (IS_ERR(new_dentry)) | |
291 | goto exit4; | |
292 | ||
293 | /* target should not be an ancestor of source */ | |
294 | rc = -ENOTEMPTY; | |
295 | if (new_dentry == trap) | |
296 | goto exit5; | |
297 | ||
298 | rc = vfs_rename(old_dir->d_inode, old_dentry, | |
299 | new_dir->d_inode, new_dentry); | |
300 | exit5: | |
301 | dput(new_dentry); | |
302 | exit4: | |
303 | dput(old_dentry); | |
304 | exit3: | |
305 | unlock_rename(new_dir, old_dir); | |
306 | exit2: | |
307 | path_release(&newnd); | |
308 | exit1: | |
309 | path_release(&oldnd); | |
310 | exit: | |
311 | return rc; | |
0b3cf046 | 312 | } |
4b171585 | 313 | EXPORT_SYMBOL(vn_rename); |
0b3cf046 | 314 | |
4b171585 | 315 | int |
316 | vn_getattr(vnode_t *vp, vattr_t *vap, int flags, int x3, void *x4) | |
0b3cf046 | 317 | { |
4b171585 | 318 | struct file *fp; |
319 | struct kstat stat; | |
320 | int rc; | |
321 | ||
322 | BUG_ON(!vp); | |
323 | BUG_ON(!vp->v_fp); | |
324 | BUG_ON(!vap); | |
325 | ||
326 | fp = vp->v_fp; | |
327 | ||
328 | rc = vfs_getattr(fp->f_vfsmnt, fp->f_dentry, &stat); | |
329 | if (rc) | |
330 | return rc; | |
331 | ||
332 | vap->va_type = vn_get_sol_type(stat.mode); | |
333 | vap->va_mode = stat.mode; | |
334 | vap->va_uid = stat.uid; | |
335 | vap->va_gid = stat.gid; | |
336 | vap->va_fsid = 0; | |
337 | vap->va_nodeid = stat.ino; | |
338 | vap->va_nlink = stat.nlink; | |
339 | vap->va_size = stat.size; | |
340 | vap->va_blocksize = stat.blksize; | |
341 | vap->va_atime.tv_sec = stat.atime.tv_sec; | |
342 | vap->va_atime.tv_usec = stat.atime.tv_nsec / NSEC_PER_USEC; | |
343 | vap->va_mtime.tv_sec = stat.mtime.tv_sec; | |
344 | vap->va_mtime.tv_usec = stat.mtime.tv_nsec / NSEC_PER_USEC; | |
345 | vap->va_ctime.tv_sec = stat.ctime.tv_sec; | |
346 | vap->va_ctime.tv_usec = stat.ctime.tv_nsec / NSEC_PER_USEC; | |
347 | vap->va_rdev = stat.rdev; | |
348 | vap->va_blocks = stat.blocks; | |
349 | ||
350 | return rc; | |
0b3cf046 | 351 | } |
4b171585 | 352 | EXPORT_SYMBOL(vn_getattr); |
353 | ||
2f5d55aa | 354 | int vn_fsync(vnode_t *vp, int flags, void *x3, void *x4) |
4b171585 | 355 | { |
356 | BUG_ON(!vp); | |
357 | BUG_ON(!vp->v_fp); | |
358 | ||
359 | return file_fsync(vp->v_fp, vp->v_fp->f_dentry, 0); | |
360 | } /* vn_fsync() */ | |
361 | EXPORT_SYMBOL(vn_fsync); |