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Diffstat (limited to 'fs/btrfs/list.h')
-rw-r--r-- | fs/btrfs/list.h | 418 |
1 files changed, 0 insertions, 418 deletions
diff --git a/fs/btrfs/list.h b/fs/btrfs/list.h deleted file mode 100644 index 1aafafb13370..000000000000 --- a/fs/btrfs/list.h +++ /dev/null | |||
@@ -1,418 +0,0 @@ | |||
1 | #ifndef _LINUX_LIST_H | ||
2 | #define _LINUX_LIST_H | ||
3 | |||
4 | #define LIST_POISON1 ((void *) 0x00100100) | ||
5 | #define LIST_POISON2 ((void *) 0x00200200) | ||
6 | |||
7 | /* | ||
8 | * Simple doubly linked list implementation. | ||
9 | * | ||
10 | * Some of the internal functions ("__xxx") are useful when | ||
11 | * manipulating whole lists rather than single entries, as | ||
12 | * sometimes we already know the next/prev entries and we can | ||
13 | * generate better code by using them directly rather than | ||
14 | * using the generic single-entry routines. | ||
15 | */ | ||
16 | |||
17 | struct list_head { | ||
18 | struct list_head *next, *prev; | ||
19 | }; | ||
20 | |||
21 | #define LIST_HEAD_INIT(name) { &(name), &(name) } | ||
22 | |||
23 | #define LIST_HEAD(name) \ | ||
24 | struct list_head name = LIST_HEAD_INIT(name) | ||
25 | |||
26 | static inline void INIT_LIST_HEAD(struct list_head *list) | ||
27 | { | ||
28 | list->next = list; | ||
29 | list->prev = list; | ||
30 | } | ||
31 | |||
32 | /* | ||
33 | * Insert a new entry between two known consecutive entries. | ||
34 | * | ||
35 | * This is only for internal list manipulation where we know | ||
36 | * the prev/next entries already! | ||
37 | */ | ||
38 | #ifndef CONFIG_DEBUG_LIST | ||
39 | static inline void __list_add(struct list_head *new, | ||
40 | struct list_head *prev, | ||
41 | struct list_head *next) | ||
42 | { | ||
43 | next->prev = new; | ||
44 | new->next = next; | ||
45 | new->prev = prev; | ||
46 | prev->next = new; | ||
47 | } | ||
48 | #else | ||
49 | extern void __list_add(struct list_head *new, | ||
50 | struct list_head *prev, | ||
51 | struct list_head *next); | ||
52 | #endif | ||
53 | |||
54 | /** | ||
55 | * list_add - add a new entry | ||
56 | * @new: new entry to be added | ||
57 | * @head: list head to add it after | ||
58 | * | ||
59 | * Insert a new entry after the specified head. | ||
60 | * This is good for implementing stacks. | ||
61 | */ | ||
62 | #ifndef CONFIG_DEBUG_LIST | ||
63 | static inline void list_add(struct list_head *new, struct list_head *head) | ||
64 | { | ||
65 | __list_add(new, head, head->next); | ||
66 | } | ||
67 | #else | ||
68 | extern void list_add(struct list_head *new, struct list_head *head); | ||
69 | #endif | ||
70 | |||
71 | |||
72 | /** | ||
73 | * list_add_tail - add a new entry | ||
74 | * @new: new entry to be added | ||
75 | * @head: list head to add it before | ||
76 | * | ||
77 | * Insert a new entry before the specified head. | ||
78 | * This is useful for implementing queues. | ||
79 | */ | ||
80 | static inline void list_add_tail(struct list_head *new, struct list_head *head) | ||
81 | { | ||
82 | __list_add(new, head->prev, head); | ||
83 | } | ||
84 | |||
85 | /* | ||
86 | * Delete a list entry by making the prev/next entries | ||
87 | * point to each other. | ||
88 | * | ||
89 | * This is only for internal list manipulation where we know | ||
90 | * the prev/next entries already! | ||
91 | */ | ||
92 | static inline void __list_del(struct list_head * prev, struct list_head * next) | ||
93 | { | ||
94 | next->prev = prev; | ||
95 | prev->next = next; | ||
96 | } | ||
97 | |||
98 | /** | ||
99 | * list_del - deletes entry from list. | ||
100 | * @entry: the element to delete from the list. | ||
101 | * Note: list_empty on entry does not return true after this, the entry is | ||
102 | * in an undefined state. | ||
103 | */ | ||
104 | #ifndef CONFIG_DEBUG_LIST | ||
105 | static inline void list_del(struct list_head *entry) | ||
106 | { | ||
107 | __list_del(entry->prev, entry->next); | ||
108 | entry->next = LIST_POISON1; | ||
109 | entry->prev = LIST_POISON2; | ||
110 | } | ||
111 | #else | ||
112 | extern void list_del(struct list_head *entry); | ||
113 | #endif | ||
114 | |||
115 | /** | ||
116 | * list_replace - replace old entry by new one | ||
117 | * @old : the element to be replaced | ||
118 | * @new : the new element to insert | ||
119 | * Note: if 'old' was empty, it will be overwritten. | ||
120 | */ | ||
121 | static inline void list_replace(struct list_head *old, | ||
122 | struct list_head *new) | ||
123 | { | ||
124 | new->next = old->next; | ||
125 | new->next->prev = new; | ||
126 | new->prev = old->prev; | ||
127 | new->prev->next = new; | ||
128 | } | ||
129 | |||
130 | static inline void list_replace_init(struct list_head *old, | ||
131 | struct list_head *new) | ||
132 | { | ||
133 | list_replace(old, new); | ||
134 | INIT_LIST_HEAD(old); | ||
135 | } | ||
136 | /** | ||
137 | * list_del_init - deletes entry from list and reinitialize it. | ||
138 | * @entry: the element to delete from the list. | ||
139 | */ | ||
140 | static inline void list_del_init(struct list_head *entry) | ||
141 | { | ||
142 | __list_del(entry->prev, entry->next); | ||
143 | INIT_LIST_HEAD(entry); | ||
144 | } | ||
145 | |||
146 | /** | ||
147 | * list_move - delete from one list and add as another's head | ||
148 | * @list: the entry to move | ||
149 | * @head: the head that will precede our entry | ||
150 | */ | ||
151 | static inline void list_move(struct list_head *list, struct list_head *head) | ||
152 | { | ||
153 | __list_del(list->prev, list->next); | ||
154 | list_add(list, head); | ||
155 | } | ||
156 | |||
157 | /** | ||
158 | * list_move_tail - delete from one list and add as another's tail | ||
159 | * @list: the entry to move | ||
160 | * @head: the head that will follow our entry | ||
161 | */ | ||
162 | static inline void list_move_tail(struct list_head *list, | ||
163 | struct list_head *head) | ||
164 | { | ||
165 | __list_del(list->prev, list->next); | ||
166 | list_add_tail(list, head); | ||
167 | } | ||
168 | |||
169 | /** | ||
170 | * list_is_last - tests whether @list is the last entry in list @head | ||
171 | * @list: the entry to test | ||
172 | * @head: the head of the list | ||
173 | */ | ||
174 | static inline int list_is_last(const struct list_head *list, | ||
175 | const struct list_head *head) | ||
176 | { | ||
177 | return list->next == head; | ||
178 | } | ||
179 | |||
180 | /** | ||
181 | * list_empty - tests whether a list is empty | ||
182 | * @head: the list to test. | ||
183 | */ | ||
184 | static inline int list_empty(const struct list_head *head) | ||
185 | { | ||
186 | return head->next == head; | ||
187 | } | ||
188 | |||
189 | /** | ||
190 | * list_empty_careful - tests whether a list is empty and not being modified | ||
191 | * @head: the list to test | ||
192 | * | ||
193 | * Description: | ||
194 | * tests whether a list is empty _and_ checks that no other CPU might be | ||
195 | * in the process of modifying either member (next or prev) | ||
196 | * | ||
197 | * NOTE: using list_empty_careful() without synchronization | ||
198 | * can only be safe if the only activity that can happen | ||
199 | * to the list entry is list_del_init(). Eg. it cannot be used | ||
200 | * if another CPU could re-list_add() it. | ||
201 | */ | ||
202 | static inline int list_empty_careful(const struct list_head *head) | ||
203 | { | ||
204 | struct list_head *next = head->next; | ||
205 | return (next == head) && (next == head->prev); | ||
206 | } | ||
207 | |||
208 | static inline void __list_splice(struct list_head *list, | ||
209 | struct list_head *head) | ||
210 | { | ||
211 | struct list_head *first = list->next; | ||
212 | struct list_head *last = list->prev; | ||
213 | struct list_head *at = head->next; | ||
214 | |||
215 | first->prev = head; | ||
216 | head->next = first; | ||
217 | |||
218 | last->next = at; | ||
219 | at->prev = last; | ||
220 | } | ||
221 | |||
222 | /** | ||
223 | * list_splice - join two lists | ||
224 | * @list: the new list to add. | ||
225 | * @head: the place to add it in the first list. | ||
226 | */ | ||
227 | static inline void list_splice(struct list_head *list, struct list_head *head) | ||
228 | { | ||
229 | if (!list_empty(list)) | ||
230 | __list_splice(list, head); | ||
231 | } | ||
232 | |||
233 | /** | ||
234 | * list_splice_init - join two lists and reinitialise the emptied list. | ||
235 | * @list: the new list to add. | ||
236 | * @head: the place to add it in the first list. | ||
237 | * | ||
238 | * The list at @list is reinitialised | ||
239 | */ | ||
240 | static inline void list_splice_init(struct list_head *list, | ||
241 | struct list_head *head) | ||
242 | { | ||
243 | if (!list_empty(list)) { | ||
244 | __list_splice(list, head); | ||
245 | INIT_LIST_HEAD(list); | ||
246 | } | ||
247 | } | ||
248 | |||
249 | /** | ||
250 | * list_entry - get the struct for this entry | ||
251 | * @ptr: the &struct list_head pointer. | ||
252 | * @type: the type of the struct this is embedded in. | ||
253 | * @member: the name of the list_struct within the struct. | ||
254 | */ | ||
255 | #define list_entry(ptr, type, member) \ | ||
256 | container_of(ptr, type, member) | ||
257 | |||
258 | /** | ||
259 | * list_for_each - iterate over a list | ||
260 | * @pos: the &struct list_head to use as a loop cursor. | ||
261 | * @head: the head for your list. | ||
262 | */ | ||
263 | #define list_for_each(pos, head) \ | ||
264 | for (pos = (head)->next; prefetch(pos->next), pos != (head); \ | ||
265 | pos = pos->next) | ||
266 | |||
267 | /** | ||
268 | * __list_for_each - iterate over a list | ||
269 | * @pos: the &struct list_head to use as a loop cursor. | ||
270 | * @head: the head for your list. | ||
271 | * | ||
272 | * This variant differs from list_for_each() in that it's the | ||
273 | * simplest possible list iteration code, no prefetching is done. | ||
274 | * Use this for code that knows the list to be very short (empty | ||
275 | * or 1 entry) most of the time. | ||
276 | */ | ||
277 | #define __list_for_each(pos, head) \ | ||
278 | for (pos = (head)->next; pos != (head); pos = pos->next) | ||
279 | |||
280 | /** | ||
281 | * list_for_each_prev - iterate over a list backwards | ||
282 | * @pos: the &struct list_head to use as a loop cursor. | ||
283 | * @head: the head for your list. | ||
284 | */ | ||
285 | #define list_for_each_prev(pos, head) \ | ||
286 | for (pos = (head)->prev; prefetch(pos->prev), pos != (head); \ | ||
287 | pos = pos->prev) | ||
288 | |||
289 | /** | ||
290 | * list_for_each_safe - iterate over a list safe against removal of list entry | ||
291 | * @pos: the &struct list_head to use as a loop cursor. | ||
292 | * @n: another &struct list_head to use as temporary storage | ||
293 | * @head: the head for your list. | ||
294 | */ | ||
295 | #define list_for_each_safe(pos, n, head) \ | ||
296 | for (pos = (head)->next, n = pos->next; pos != (head); \ | ||
297 | pos = n, n = pos->next) | ||
298 | |||
299 | /** | ||
300 | * list_for_each_entry - iterate over list of given type | ||
301 | * @pos: the type * to use as a loop cursor. | ||
302 | * @head: the head for your list. | ||
303 | * @member: the name of the list_struct within the struct. | ||
304 | */ | ||
305 | #define list_for_each_entry(pos, head, member) \ | ||
306 | for (pos = list_entry((head)->next, typeof(*pos), member); \ | ||
307 | prefetch(pos->member.next), &pos->member != (head); \ | ||
308 | pos = list_entry(pos->member.next, typeof(*pos), member)) | ||
309 | |||
310 | /** | ||
311 | * list_for_each_entry_reverse - iterate backwards over list of given type. | ||
312 | * @pos: the type * to use as a loop cursor. | ||
313 | * @head: the head for your list. | ||
314 | * @member: the name of the list_struct within the struct. | ||
315 | */ | ||
316 | #define list_for_each_entry_reverse(pos, head, member) \ | ||
317 | for (pos = list_entry((head)->prev, typeof(*pos), member); \ | ||
318 | prefetch(pos->member.prev), &pos->member != (head); \ | ||
319 | pos = list_entry(pos->member.prev, typeof(*pos), member)) | ||
320 | |||
321 | /** | ||
322 | * list_prepare_entry - prepare a pos entry for use in list_for_each_entry_continue | ||
323 | * @pos: the type * to use as a start point | ||
324 | * @head: the head of the list | ||
325 | * @member: the name of the list_struct within the struct. | ||
326 | * | ||
327 | * Prepares a pos entry for use as a start point in list_for_each_entry_continue. | ||
328 | */ | ||
329 | #define list_prepare_entry(pos, head, member) \ | ||
330 | ((pos) ? : list_entry(head, typeof(*pos), member)) | ||
331 | |||
332 | /** | ||
333 | * list_for_each_entry_continue - continue iteration over list of given type | ||
334 | * @pos: the type * to use as a loop cursor. | ||
335 | * @head: the head for your list. | ||
336 | * @member: the name of the list_struct within the struct. | ||
337 | * | ||
338 | * Continue to iterate over list of given type, continuing after | ||
339 | * the current position. | ||
340 | */ | ||
341 | #define list_for_each_entry_continue(pos, head, member) \ | ||
342 | for (pos = list_entry(pos->member.next, typeof(*pos), member); \ | ||
343 | prefetch(pos->member.next), &pos->member != (head); \ | ||
344 | pos = list_entry(pos->member.next, typeof(*pos), member)) | ||
345 | |||
346 | /** | ||
347 | * list_for_each_entry_from - iterate over list of given type from the current point | ||
348 | * @pos: the type * to use as a loop cursor. | ||
349 | * @head: the head for your list. | ||
350 | * @member: the name of the list_struct within the struct. | ||
351 | * | ||
352 | * Iterate over list of given type, continuing from current position. | ||
353 | */ | ||
354 | #define list_for_each_entry_from(pos, head, member) \ | ||
355 | for (; prefetch(pos->member.next), &pos->member != (head); \ | ||
356 | pos = list_entry(pos->member.next, typeof(*pos), member)) | ||
357 | |||
358 | /** | ||
359 | * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry | ||
360 | * @pos: the type * to use as a loop cursor. | ||
361 | * @n: another type * to use as temporary storage | ||
362 | * @head: the head for your list. | ||
363 | * @member: the name of the list_struct within the struct. | ||
364 | */ | ||
365 | #define list_for_each_entry_safe(pos, n, head, member) \ | ||
366 | for (pos = list_entry((head)->next, typeof(*pos), member), \ | ||
367 | n = list_entry(pos->member.next, typeof(*pos), member); \ | ||
368 | &pos->member != (head); \ | ||
369 | pos = n, n = list_entry(n->member.next, typeof(*n), member)) | ||
370 | |||
371 | /** | ||
372 | * list_for_each_entry_safe_continue | ||
373 | * @pos: the type * to use as a loop cursor. | ||
374 | * @n: another type * to use as temporary storage | ||
375 | * @head: the head for your list. | ||
376 | * @member: the name of the list_struct within the struct. | ||
377 | * | ||
378 | * Iterate over list of given type, continuing after current point, | ||
379 | * safe against removal of list entry. | ||
380 | */ | ||
381 | #define list_for_each_entry_safe_continue(pos, n, head, member) \ | ||
382 | for (pos = list_entry(pos->member.next, typeof(*pos), member), \ | ||
383 | n = list_entry(pos->member.next, typeof(*pos), member); \ | ||
384 | &pos->member != (head); \ | ||
385 | pos = n, n = list_entry(n->member.next, typeof(*n), member)) | ||
386 | |||
387 | /** | ||
388 | * list_for_each_entry_safe_from | ||
389 | * @pos: the type * to use as a loop cursor. | ||
390 | * @n: another type * to use as temporary storage | ||
391 | * @head: the head for your list. | ||
392 | * @member: the name of the list_struct within the struct. | ||
393 | * | ||
394 | * Iterate over list of given type from current point, safe against | ||
395 | * removal of list entry. | ||
396 | */ | ||
397 | #define list_for_each_entry_safe_from(pos, n, head, member) \ | ||
398 | for (n = list_entry(pos->member.next, typeof(*pos), member); \ | ||
399 | &pos->member != (head); \ | ||
400 | pos = n, n = list_entry(n->member.next, typeof(*n), member)) | ||
401 | |||
402 | /** | ||
403 | * list_for_each_entry_safe_reverse | ||
404 | * @pos: the type * to use as a loop cursor. | ||
405 | * @n: another type * to use as temporary storage | ||
406 | * @head: the head for your list. | ||
407 | * @member: the name of the list_struct within the struct. | ||
408 | * | ||
409 | * Iterate backwards over list of given type, safe against removal | ||
410 | * of list entry. | ||
411 | */ | ||
412 | #define list_for_each_entry_safe_reverse(pos, n, head, member) \ | ||
413 | for (pos = list_entry((head)->prev, typeof(*pos), member), \ | ||
414 | n = list_entry(pos->member.prev, typeof(*pos), member); \ | ||
415 | &pos->member != (head); \ | ||
416 | pos = n, n = list_entry(n->member.prev, typeof(*n), member)) | ||
417 | |||
418 | #endif | ||