1 |
kumaneko |
111 |
/* |
2 |
|
|
* fs/realpath.c |
3 |
|
|
* |
4 |
|
|
* Get the canonicalized absolute pathnames. The basis for SAKURA and TOMOYO. |
5 |
|
|
* |
6 |
kumaneko |
856 |
* Copyright (C) 2005-2008 NTT DATA CORPORATION |
7 |
kumaneko |
111 |
* |
8 |
kumaneko |
1015 |
* Version: 1.6.0-pre 2008/03/04 |
9 |
kumaneko |
111 |
* |
10 |
|
|
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
11 |
|
|
* See README.ccs for ChangeLog. |
12 |
|
|
* |
13 |
|
|
*/ |
14 |
|
|
#include <linux/string.h> |
15 |
|
|
#include <linux/mm.h> |
16 |
|
|
#include <linux/utime.h> |
17 |
|
|
#include <linux/file.h> |
18 |
|
|
#include <linux/smp_lock.h> |
19 |
|
|
#include <linux/module.h> |
20 |
|
|
#include <linux/slab.h> |
21 |
|
|
#include <asm/uaccess.h> |
22 |
|
|
#include <asm/atomic.h> |
23 |
|
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#include <linux/version.h> |
24 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) |
25 |
|
|
#include <linux/namei.h> |
26 |
|
|
#include <linux/mount.h> |
27 |
|
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static const int lookup_flags = LOOKUP_FOLLOW; |
28 |
|
|
#else |
29 |
|
|
static const int lookup_flags = LOOKUP_FOLLOW | LOOKUP_POSITIVE; |
30 |
|
|
#endif |
31 |
|
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#include <linux/realpath.h> |
32 |
|
|
#include <linux/proc_fs.h> |
33 |
|
|
#include <linux/ccs_common.h> |
34 |
|
|
|
35 |
|
|
/***** realpath handler *****/ |
36 |
|
|
|
37 |
|
|
/* |
38 |
|
|
* GetAbsolutePath - return the path of a dentry but ignores chroot'ed root. |
39 |
|
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* @dentry: dentry to report |
40 |
|
|
* @vfsmnt: vfsmnt to which the dentry belongs |
41 |
|
|
* @buffer: buffer to return value in |
42 |
|
|
* @buflen: buffer length |
43 |
|
|
* |
44 |
|
|
* Caller holds the dcache_lock. |
45 |
|
|
* Based on __d_path() in fs/dcache.c |
46 |
|
|
* |
47 |
|
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* If dentry is a directory, trailing '/' is appended. |
48 |
|
|
* Characters other than ' ' < c < 127 are converted to \ooo style octal string. |
49 |
|
|
* Character \ is converted to \\ string. |
50 |
|
|
*/ |
51 |
|
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static int GetAbsolutePath(struct dentry *dentry, struct vfsmount *vfsmnt, char *buffer, int buflen) |
52 |
|
|
{ |
53 |
|
|
char *start = buffer; |
54 |
|
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char *end = buffer + buflen; |
55 |
kumaneko |
621 |
bool is_dir = (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)); |
56 |
kumaneko |
111 |
|
57 |
|
|
if (buflen < 256) goto out; |
58 |
|
|
|
59 |
|
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*--end = '\0'; |
60 |
|
|
buflen--; |
61 |
|
|
|
62 |
|
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for (;;) { |
63 |
|
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struct dentry *parent; |
64 |
|
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|
65 |
|
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if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) { |
66 |
|
|
/* Global root? */ |
67 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) |
68 |
|
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spin_lock(&vfsmount_lock); |
69 |
|
|
#endif |
70 |
|
|
if (vfsmnt->mnt_parent == vfsmnt) { |
71 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) |
72 |
|
|
spin_unlock(&vfsmount_lock); |
73 |
|
|
#endif |
74 |
|
|
break; |
75 |
|
|
} |
76 |
|
|
dentry = vfsmnt->mnt_mountpoint; |
77 |
|
|
vfsmnt = vfsmnt->mnt_parent; |
78 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) |
79 |
|
|
spin_unlock(&vfsmount_lock); |
80 |
|
|
#endif |
81 |
|
|
continue; |
82 |
|
|
} |
83 |
|
|
if (is_dir) { |
84 |
|
|
is_dir = 0; *--end = '/'; buflen--; |
85 |
|
|
} |
86 |
|
|
parent = dentry->d_parent; |
87 |
|
|
{ |
88 |
|
|
const char *sp = dentry->d_name.name; |
89 |
|
|
const char *cp = sp + dentry->d_name.len - 1; |
90 |
|
|
unsigned char c; |
91 |
|
|
|
92 |
|
|
/* Exception: Use /proc/self/ rather than /proc/\$/ for current process. */ |
93 |
|
|
if (IS_ROOT(parent) && *sp > '0' && *sp <= '9' && parent->d_sb && parent->d_sb->s_magic == PROC_SUPER_MAGIC) { |
94 |
|
|
char *ep; |
95 |
|
|
const pid_t pid = (pid_t) simple_strtoul(sp, &ep, 10); |
96 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) |
97 |
|
|
if (!*ep && pid == current->tgid) { sp = "self"; cp = sp + 3; } |
98 |
|
|
#else |
99 |
|
|
if (!*ep && pid == current->pid) { sp = "self"; cp = sp + 3; } |
100 |
|
|
#endif |
101 |
|
|
} |
102 |
|
|
|
103 |
|
|
while (sp <= cp) { |
104 |
|
|
c = * (unsigned char *) cp; |
105 |
|
|
if (c == '\\') { |
106 |
|
|
buflen -= 2; |
107 |
|
|
if (buflen < 0) goto out; |
108 |
|
|
*--end = '\\'; |
109 |
|
|
*--end = '\\'; |
110 |
|
|
} else if (c > ' ' && c < 127) { |
111 |
|
|
if (--buflen < 0) goto out; |
112 |
|
|
*--end = (char) c; |
113 |
|
|
} else { |
114 |
|
|
buflen -= 4; |
115 |
|
|
if (buflen < 0) goto out; |
116 |
|
|
*--end = (c & 7) + '0'; |
117 |
|
|
*--end = ((c >> 3) & 7) + '0'; |
118 |
|
|
*--end = (c >> 6) + '0'; |
119 |
|
|
*--end = '\\'; |
120 |
|
|
} |
121 |
|
|
cp--; |
122 |
|
|
} |
123 |
|
|
if (--buflen < 0) goto out; |
124 |
|
|
*--end = '/'; |
125 |
|
|
} |
126 |
|
|
dentry = parent; |
127 |
|
|
} |
128 |
|
|
if (*end == '/') { buflen++; end++; } |
129 |
|
|
{ |
130 |
|
|
const char *sp = dentry->d_name.name; |
131 |
|
|
const char *cp = sp + dentry->d_name.len - 1; |
132 |
|
|
unsigned char c; |
133 |
|
|
while (sp <= cp) { |
134 |
|
|
c = * (unsigned char *) cp; |
135 |
|
|
if (c == '\\') { |
136 |
|
|
buflen -= 2; |
137 |
|
|
if (buflen < 0) goto out; |
138 |
|
|
*--end = '\\'; |
139 |
|
|
*--end = '\\'; |
140 |
|
|
} else if (c > ' ' && c < 127) { |
141 |
|
|
if (--buflen < 0) goto out; |
142 |
|
|
*--end = (char) c; |
143 |
|
|
} else { |
144 |
|
|
buflen -= 4; |
145 |
|
|
if (buflen < 0) goto out; |
146 |
|
|
*--end = (c & 7) + '0'; |
147 |
|
|
*--end = ((c >> 3) & 7) + '0'; |
148 |
|
|
*--end = (c >> 6) + '0'; |
149 |
|
|
*--end = '\\'; |
150 |
|
|
} |
151 |
|
|
cp--; |
152 |
|
|
} |
153 |
|
|
} |
154 |
|
|
/* Move the pathname to the top of the buffer. */ |
155 |
|
|
memmove(start, end, strlen(end) + 1); |
156 |
|
|
return 0; |
157 |
|
|
out: |
158 |
|
|
return -ENOMEM; |
159 |
|
|
} |
160 |
|
|
|
161 |
|
|
/* Returns realpath(3) of the given dentry but ignores chroot'ed root. */ |
162 |
|
|
int realpath_from_dentry2(struct dentry *dentry, struct vfsmount *mnt, char *newname, int newname_len) |
163 |
|
|
{ |
164 |
|
|
int error; |
165 |
|
|
struct dentry *d_dentry; |
166 |
|
|
struct vfsmount *d_mnt; |
167 |
|
|
if (!dentry || !mnt || !newname || newname_len <= 0) return -EINVAL; |
168 |
|
|
d_dentry = dget(dentry); |
169 |
|
|
d_mnt = mntget(mnt); |
170 |
|
|
/***** CRITICAL SECTION START *****/ |
171 |
|
|
spin_lock(&dcache_lock); |
172 |
|
|
error = GetAbsolutePath(d_dentry, d_mnt, newname, newname_len); |
173 |
|
|
spin_unlock(&dcache_lock); |
174 |
|
|
/***** CRITICAL SECTION END *****/ |
175 |
|
|
dput(d_dentry); |
176 |
|
|
mntput(d_mnt); |
177 |
|
|
return error; |
178 |
|
|
} |
179 |
|
|
|
180 |
|
|
/* Returns realpath(3) of the given pathname but ignores chroot'ed root. */ |
181 |
|
|
/* These functions use ccs_alloc(), so caller must ccs_free() if these functions didn't return NULL. */ |
182 |
|
|
char *realpath_from_dentry(struct dentry *dentry, struct vfsmount *mnt) |
183 |
|
|
{ |
184 |
|
|
char *buf = ccs_alloc(CCS_MAX_PATHNAME_LEN); |
185 |
|
|
if (buf && realpath_from_dentry2(dentry, mnt, buf, CCS_MAX_PATHNAME_LEN - 1) == 0) return buf; |
186 |
|
|
ccs_free(buf); |
187 |
|
|
return NULL; |
188 |
|
|
} |
189 |
|
|
|
190 |
|
|
char *realpath(const char *pathname) |
191 |
|
|
{ |
192 |
|
|
struct nameidata nd; |
193 |
|
|
if (pathname && path_lookup(pathname, lookup_flags, &nd) == 0) { |
194 |
kumaneko |
992 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25) |
195 |
kumaneko |
990 |
char *buf = realpath_from_dentry(nd.path.dentry, nd.path.mnt); |
196 |
|
|
path_put(&nd.path); |
197 |
|
|
#else |
198 |
kumaneko |
111 |
char *buf = realpath_from_dentry(nd.dentry, nd.mnt); |
199 |
|
|
path_release(&nd); |
200 |
kumaneko |
990 |
#endif |
201 |
kumaneko |
111 |
return buf; |
202 |
|
|
} |
203 |
|
|
return NULL; |
204 |
|
|
} |
205 |
|
|
|
206 |
|
|
char *realpath_nofollow(const char *pathname) |
207 |
|
|
{ |
208 |
|
|
struct nameidata nd; |
209 |
|
|
if (pathname && path_lookup(pathname, lookup_flags ^ LOOKUP_FOLLOW, &nd) == 0) { |
210 |
kumaneko |
992 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,25) |
211 |
kumaneko |
990 |
char *buf = realpath_from_dentry(nd.path.dentry, nd.path.mnt); |
212 |
|
|
path_put(&nd.path); |
213 |
|
|
#else |
214 |
kumaneko |
111 |
char *buf = realpath_from_dentry(nd.dentry, nd.mnt); |
215 |
|
|
path_release(&nd); |
216 |
kumaneko |
990 |
#endif |
217 |
kumaneko |
111 |
return buf; |
218 |
|
|
} |
219 |
|
|
return NULL; |
220 |
|
|
} |
221 |
|
|
|
222 |
|
|
/***** Private memory allocator. *****/ |
223 |
|
|
|
224 |
|
|
/* |
225 |
|
|
* Round up an integer so that the returned pointers are appropriately aligned. |
226 |
|
|
* FIXME: Are there more requirements that is needed for assigning value atomically? |
227 |
|
|
*/ |
228 |
|
|
static inline unsigned int ROUNDUP(const unsigned int size) { |
229 |
|
|
if (sizeof(void *) >= sizeof(long)) { |
230 |
|
|
return ((size + sizeof(void *) - 1) / sizeof(void *)) * sizeof(void *); |
231 |
|
|
} else { |
232 |
|
|
return ((size + sizeof(long) - 1) / sizeof(long)) * sizeof(long); |
233 |
|
|
} |
234 |
|
|
} |
235 |
|
|
|
236 |
|
|
static unsigned int allocated_memory_for_elements = 0; |
237 |
|
|
|
238 |
|
|
unsigned int GetMemoryUsedForElements(void) |
239 |
|
|
{ |
240 |
|
|
return allocated_memory_for_elements; |
241 |
|
|
} |
242 |
|
|
|
243 |
|
|
/* Allocate memory for structures. The RAM is chunked, so NEVER try to kfree() the returned pointer. */ |
244 |
kumaneko |
214 |
void *alloc_element(const unsigned int size) |
245 |
kumaneko |
111 |
{ |
246 |
kumaneko |
652 |
static DEFINE_MUTEX(lock); |
247 |
kumaneko |
111 |
static char *buf = NULL; |
248 |
|
|
static unsigned int buf_used_len = PAGE_SIZE; |
249 |
|
|
char *ptr = NULL; |
250 |
|
|
const unsigned int word_aligned_size = ROUNDUP(size); |
251 |
|
|
if (word_aligned_size > PAGE_SIZE) return NULL; |
252 |
kumaneko |
652 |
mutex_lock(&lock); |
253 |
kumaneko |
111 |
if (buf_used_len + word_aligned_size > PAGE_SIZE) { |
254 |
|
|
if ((ptr = kmalloc(PAGE_SIZE, GFP_KERNEL)) == NULL) { |
255 |
|
|
printk("ERROR: Out of memory for alloc_element().\n"); |
256 |
|
|
if (!sbin_init_started) panic("MAC Initialization failed.\n"); |
257 |
|
|
} else { |
258 |
|
|
memset(ptr, 0, PAGE_SIZE); |
259 |
|
|
buf = ptr; |
260 |
|
|
allocated_memory_for_elements += PAGE_SIZE; |
261 |
|
|
buf_used_len = word_aligned_size; |
262 |
|
|
ptr = buf; |
263 |
|
|
} |
264 |
|
|
} else if (word_aligned_size) { |
265 |
|
|
int i; |
266 |
|
|
ptr = buf + buf_used_len; |
267 |
|
|
buf_used_len += word_aligned_size; |
268 |
|
|
for (i = 0; i < word_aligned_size; i++) { |
269 |
|
|
if (ptr[i]) { |
270 |
|
|
printk(KERN_ERR "WARNING: Reserved memory was tainted! The system might go wrong.\n"); |
271 |
|
|
ptr[i] = '\0'; |
272 |
|
|
} |
273 |
|
|
} |
274 |
|
|
} |
275 |
kumaneko |
652 |
mutex_unlock(&lock); |
276 |
kumaneko |
111 |
return ptr; |
277 |
|
|
} |
278 |
|
|
|
279 |
|
|
/***** Shared memory allocator. *****/ |
280 |
|
|
|
281 |
|
|
static unsigned int allocated_memory_for_savename = 0; |
282 |
|
|
|
283 |
|
|
unsigned int GetMemoryUsedForSaveName(void) |
284 |
|
|
{ |
285 |
|
|
return allocated_memory_for_savename; |
286 |
|
|
} |
287 |
|
|
|
288 |
|
|
#define MAX_HASH 256 |
289 |
|
|
|
290 |
kumaneko |
214 |
struct name_entry { |
291 |
kumaneko |
731 |
struct list1_head list; |
292 |
kumaneko |
111 |
struct path_info entry; |
293 |
kumaneko |
214 |
}; |
294 |
kumaneko |
111 |
|
295 |
kumaneko |
214 |
struct free_memory_block_list { |
296 |
kumaneko |
731 |
struct list_head list; |
297 |
kumaneko |
111 |
char *ptr; /* Pointer to a free area. */ |
298 |
|
|
int len; /* Length of the area. */ |
299 |
kumaneko |
214 |
}; |
300 |
kumaneko |
111 |
|
301 |
kumaneko |
731 |
static struct list1_head name_list[MAX_HASH]; /* The list of names. */ |
302 |
|
|
|
303 |
kumaneko |
111 |
/* Keep the given name on the RAM. The RAM is shared, so NEVER try to modify or kfree() the returned name. */ |
304 |
|
|
const struct path_info *SaveName(const char *name) |
305 |
|
|
{ |
306 |
kumaneko |
731 |
static LIST_HEAD(fmb_list); |
307 |
kumaneko |
652 |
static DEFINE_MUTEX(lock); |
308 |
kumaneko |
731 |
struct name_entry *ptr; |
309 |
kumaneko |
111 |
unsigned int hash; |
310 |
kumaneko |
731 |
struct free_memory_block_list *fmb; |
311 |
kumaneko |
111 |
int len; |
312 |
kumaneko |
731 |
char *cp; |
313 |
kumaneko |
111 |
if (!name) return NULL; |
314 |
|
|
len = strlen(name) + 1; |
315 |
|
|
if (len > CCS_MAX_PATHNAME_LEN) { |
316 |
|
|
printk("ERROR: Name too long for SaveName().\n"); |
317 |
|
|
return NULL; |
318 |
|
|
} |
319 |
|
|
hash = full_name_hash((const unsigned char *) name, len - 1); |
320 |
kumaneko |
652 |
mutex_lock(&lock); |
321 |
kumaneko |
731 |
list1_for_each_entry(ptr, &name_list[hash % MAX_HASH], list) { |
322 |
kumaneko |
111 |
if (hash == ptr->entry.hash && strcmp(name, ptr->entry.name) == 0) goto out; |
323 |
|
|
} |
324 |
kumaneko |
731 |
list_for_each_entry(fmb, &fmb_list, list) { |
325 |
|
|
if (len <= fmb->len) goto ready; |
326 |
kumaneko |
111 |
} |
327 |
kumaneko |
731 |
cp = kmalloc(PAGE_SIZE, GFP_KERNEL); |
328 |
|
|
fmb = kmalloc(sizeof(*fmb), GFP_KERNEL); |
329 |
|
|
if (!cp || !fmb) { |
330 |
|
|
kfree(cp); |
331 |
|
|
kfree(fmb); |
332 |
|
|
printk("ERROR: Out of memory for SaveName().\n"); |
333 |
|
|
if (!sbin_init_started) panic("MAC Initialization failed.\n"); |
334 |
|
|
ptr = NULL; |
335 |
|
|
goto out; |
336 |
|
|
} |
337 |
|
|
memset(cp, 0, PAGE_SIZE); |
338 |
|
|
allocated_memory_for_savename += PAGE_SIZE; |
339 |
|
|
list_add(&fmb->list, &fmb_list); |
340 |
|
|
fmb->ptr = cp; |
341 |
|
|
fmb->len = PAGE_SIZE; |
342 |
|
|
ready: |
343 |
|
|
ptr = alloc_element(sizeof(*ptr)); |
344 |
|
|
if (!ptr) goto out; |
345 |
kumaneko |
111 |
ptr->entry.name = fmb->ptr; |
346 |
|
|
memmove(fmb->ptr, name, len); |
347 |
|
|
fill_path_info(&ptr->entry); |
348 |
|
|
fmb->ptr += len; |
349 |
|
|
fmb->len -= len; |
350 |
kumaneko |
731 |
list1_add_tail_mb(&ptr->list, &name_list[hash % MAX_HASH]); |
351 |
kumaneko |
111 |
if (fmb->len == 0) { |
352 |
kumaneko |
731 |
list_del(&fmb->list); |
353 |
|
|
kfree(fmb); |
354 |
kumaneko |
111 |
} |
355 |
|
|
out: |
356 |
kumaneko |
652 |
mutex_unlock(&lock); |
357 |
kumaneko |
111 |
return ptr ? &ptr->entry : NULL; |
358 |
|
|
} |
359 |
|
|
|
360 |
|
|
/***** Dynamic memory allocator. *****/ |
361 |
|
|
|
362 |
kumaneko |
214 |
struct cache_entry { |
363 |
kumaneko |
111 |
struct list_head list; |
364 |
|
|
void *ptr; |
365 |
|
|
int size; |
366 |
kumaneko |
214 |
}; |
367 |
kumaneko |
111 |
|
368 |
|
|
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20) |
369 |
|
|
static struct kmem_cache *ccs_cachep = NULL; |
370 |
|
|
#else |
371 |
|
|
static kmem_cache_t *ccs_cachep = NULL; |
372 |
|
|
#endif |
373 |
|
|
|
374 |
|
|
void __init realpath_Init(void) |
375 |
|
|
{ |
376 |
kumaneko |
731 |
int i; |
377 |
kumaneko |
316 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23) |
378 |
|
|
ccs_cachep = kmem_cache_create("ccs_cache", sizeof(struct cache_entry), 0, 0, NULL); |
379 |
|
|
#else |
380 |
kumaneko |
214 |
ccs_cachep = kmem_cache_create("ccs_cache", sizeof(struct cache_entry), 0, 0, NULL, NULL); |
381 |
kumaneko |
316 |
#endif |
382 |
kumaneko |
111 |
if (!ccs_cachep) panic("Can't create cache.\n"); |
383 |
kumaneko |
731 |
for (i = 0; i < MAX_HASH; i++) { |
384 |
|
|
INIT_LIST1_HEAD(&name_list[i]); |
385 |
|
|
} |
386 |
|
|
if (CCS_MAX_PATHNAME_LEN > PAGE_SIZE) panic("Bad size."); |
387 |
kumaneko |
722 |
INIT_LIST1_HEAD(&KERNEL_DOMAIN.acl_info_list); |
388 |
kumaneko |
708 |
KERNEL_DOMAIN.domainname = SaveName(ROOT_NAME); |
389 |
kumaneko |
722 |
list1_add_tail_mb(&KERNEL_DOMAIN.list, &domain_list); |
390 |
kumaneko |
708 |
if (FindDomain(ROOT_NAME) != &KERNEL_DOMAIN) panic("Can't register KERNEL_DOMAIN"); |
391 |
kumaneko |
111 |
} |
392 |
|
|
|
393 |
|
|
static LIST_HEAD(cache_list); |
394 |
|
|
static spinlock_t cache_list_lock = SPIN_LOCK_UNLOCKED; |
395 |
|
|
static unsigned int dynamic_memory_size = 0; |
396 |
|
|
|
397 |
|
|
unsigned int GetMemoryUsedForDynamic(void) |
398 |
|
|
{ |
399 |
|
|
return dynamic_memory_size; |
400 |
|
|
} |
401 |
|
|
|
402 |
kumaneko |
581 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) |
403 |
|
|
static int round2(size_t size) |
404 |
|
|
{ |
405 |
|
|
#if PAGE_SIZE == 4096 |
406 |
|
|
size_t bsize = 32; |
407 |
|
|
#else |
408 |
|
|
size_t bsize = 64; |
409 |
|
|
#endif |
410 |
|
|
while (size > bsize) bsize <<= 1; |
411 |
|
|
return bsize; |
412 |
|
|
} |
413 |
|
|
#endif |
414 |
|
|
|
415 |
kumaneko |
214 |
void *ccs_alloc(const size_t size) |
416 |
kumaneko |
111 |
{ |
417 |
|
|
void *ret = kmalloc(size, GFP_KERNEL); |
418 |
|
|
if (ret) { |
419 |
kumaneko |
214 |
struct cache_entry *new_entry = kmem_cache_alloc(ccs_cachep, GFP_KERNEL); |
420 |
kumaneko |
111 |
if (!new_entry) { |
421 |
|
|
kfree(ret); ret = NULL; |
422 |
|
|
} else { |
423 |
|
|
INIT_LIST_HEAD(&new_entry->list); |
424 |
|
|
new_entry->ptr = ret; |
425 |
kumaneko |
581 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) |
426 |
|
|
new_entry->size = ksize(ret); |
427 |
|
|
#else |
428 |
|
|
new_entry->size = round2(size); |
429 |
|
|
#endif |
430 |
kumaneko |
111 |
spin_lock(&cache_list_lock); |
431 |
|
|
list_add_tail(&new_entry->list, &cache_list); |
432 |
kumaneko |
581 |
dynamic_memory_size += new_entry->size; |
433 |
kumaneko |
111 |
spin_unlock(&cache_list_lock); |
434 |
|
|
memset(ret, 0, size); |
435 |
|
|
} |
436 |
|
|
} |
437 |
kumaneko |
214 |
return ret; |
438 |
kumaneko |
111 |
} |
439 |
|
|
|
440 |
|
|
void ccs_free(const void *p) |
441 |
|
|
{ |
442 |
|
|
struct list_head *v; |
443 |
kumaneko |
214 |
struct cache_entry *entry = NULL; |
444 |
kumaneko |
111 |
if (!p) return; |
445 |
|
|
spin_lock(&cache_list_lock); |
446 |
|
|
list_for_each(v, &cache_list) { |
447 |
kumaneko |
214 |
entry = list_entry(v, struct cache_entry, list); |
448 |
kumaneko |
111 |
if (entry->ptr != p) { |
449 |
|
|
entry = NULL; continue; |
450 |
|
|
} |
451 |
|
|
list_del(&entry->list); |
452 |
|
|
dynamic_memory_size -= entry->size; |
453 |
|
|
break; |
454 |
|
|
} |
455 |
|
|
spin_unlock(&cache_list_lock); |
456 |
|
|
if (entry) { |
457 |
|
|
kfree(p); |
458 |
|
|
kmem_cache_free(ccs_cachep, entry); |
459 |
|
|
} else { |
460 |
|
|
printk("BUG: ccs_free() with invalid pointer.\n"); |
461 |
|
|
} |
462 |
|
|
} |