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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3 | * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. | |
4 | * | |
5 | * This copyrighted material is made available to anyone wishing to use, | |
6 | * modify, copy, or redistribute it subject to the terms and conditions | |
7 | * of the GNU General Public License v.2. | |
8 | */ | |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/completion.h> | |
14 | #include <linux/buffer_head.h> | |
5c676f6d | 15 | #include <linux/gfs2_ondisk.h> |
71b86f56 | 16 | #include <linux/crc32.h> |
b3b94faa DT |
17 | #include <asm/semaphore.h> |
18 | ||
19 | #include "gfs2.h" | |
5c676f6d SW |
20 | #include "lm_interface.h" |
21 | #include "incore.h" | |
b3b94faa DT |
22 | #include "bmap.h" |
23 | #include "glock.h" | |
24 | #include "inode.h" | |
b3b94faa DT |
25 | #include "meta_io.h" |
26 | #include "page.h" | |
27 | #include "quota.h" | |
28 | #include "rgrp.h" | |
29 | #include "trans.h" | |
18ec7d5c | 30 | #include "dir.h" |
5c676f6d | 31 | #include "util.h" |
b3b94faa DT |
32 | |
33 | /* This doesn't need to be that large as max 64 bit pointers in a 4k | |
34 | * block is 512, so __u16 is fine for that. It saves stack space to | |
35 | * keep it small. | |
36 | */ | |
37 | struct metapath { | |
38 | __u16 mp_list[GFS2_MAX_META_HEIGHT]; | |
39 | }; | |
40 | ||
41 | typedef int (*block_call_t) (struct gfs2_inode *ip, struct buffer_head *dibh, | |
42 | struct buffer_head *bh, uint64_t *top, | |
43 | uint64_t *bottom, unsigned int height, | |
44 | void *data); | |
45 | ||
46 | struct strip_mine { | |
47 | int sm_first; | |
48 | unsigned int sm_height; | |
49 | }; | |
50 | ||
b3b94faa DT |
51 | /** |
52 | * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big | |
53 | * @ip: The GFS2 inode to unstuff | |
54 | * @unstuffer: the routine that handles unstuffing a non-zero length file | |
55 | * @private: private data for the unstuffer | |
56 | * | |
57 | * This routine unstuffs a dinode and returns it to a "normal" state such | |
58 | * that the height can be grown in the traditional way. | |
59 | * | |
60 | * Returns: errno | |
61 | */ | |
62 | ||
63 | int gfs2_unstuff_dinode(struct gfs2_inode *ip, gfs2_unstuffer_t unstuffer, | |
64 | void *private) | |
65 | { | |
66 | struct buffer_head *bh, *dibh; | |
67 | uint64_t block = 0; | |
18ec7d5c | 68 | int isdir = gfs2_is_dir(ip); |
b3b94faa DT |
69 | int error; |
70 | ||
71 | down_write(&ip->i_rw_mutex); | |
72 | ||
73 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
74 | if (error) | |
75 | goto out; | |
76 | ||
77 | if (ip->i_di.di_size) { | |
78 | /* Get a free block, fill it with the stuffed data, | |
79 | and write it out to disk */ | |
80 | ||
18ec7d5c | 81 | if (isdir) { |
b3b94faa DT |
82 | block = gfs2_alloc_meta(ip); |
83 | ||
61e085a8 | 84 | error = gfs2_dir_get_new_buffer(ip, block, &bh); |
b3b94faa DT |
85 | if (error) |
86 | goto out_brelse; | |
87 | gfs2_buffer_copy_tail(bh, | |
88 | sizeof(struct gfs2_meta_header), | |
89 | dibh, sizeof(struct gfs2_dinode)); | |
90 | brelse(bh); | |
91 | } else { | |
92 | block = gfs2_alloc_data(ip); | |
93 | ||
94 | error = unstuffer(ip, dibh, block, private); | |
95 | if (error) | |
96 | goto out_brelse; | |
97 | } | |
98 | } | |
99 | ||
100 | /* Set up the pointer to the new block */ | |
101 | ||
d4e9c4c3 | 102 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
103 | |
104 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
105 | ||
106 | if (ip->i_di.di_size) { | |
568f4c96 SW |
107 | *(uint64_t *)(dibh->b_data + sizeof(struct gfs2_dinode)) = |
108 | cpu_to_be64(block); | |
b3b94faa DT |
109 | ip->i_di.di_blocks++; |
110 | } | |
111 | ||
112 | ip->i_di.di_height = 1; | |
113 | ||
114 | gfs2_dinode_out(&ip->i_di, dibh->b_data); | |
115 | ||
116 | out_brelse: | |
117 | brelse(dibh); | |
118 | ||
119 | out: | |
120 | up_write(&ip->i_rw_mutex); | |
121 | ||
122 | return error; | |
123 | } | |
124 | ||
125 | /** | |
126 | * calc_tree_height - Calculate the height of a metadata tree | |
127 | * @ip: The GFS2 inode | |
128 | * @size: The proposed size of the file | |
129 | * | |
130 | * Work out how tall a metadata tree needs to be in order to accommodate a | |
131 | * file of a particular size. If size is less than the current size of | |
132 | * the inode, then the current size of the inode is used instead of the | |
133 | * supplied one. | |
134 | * | |
135 | * Returns: the height the tree should be | |
136 | */ | |
137 | ||
138 | static unsigned int calc_tree_height(struct gfs2_inode *ip, uint64_t size) | |
139 | { | |
140 | struct gfs2_sbd *sdp = ip->i_sbd; | |
141 | uint64_t *arr; | |
142 | unsigned int max, height; | |
143 | ||
144 | if (ip->i_di.di_size > size) | |
145 | size = ip->i_di.di_size; | |
146 | ||
18ec7d5c | 147 | if (gfs2_is_dir(ip)) { |
b3b94faa DT |
148 | arr = sdp->sd_jheightsize; |
149 | max = sdp->sd_max_jheight; | |
150 | } else { | |
151 | arr = sdp->sd_heightsize; | |
152 | max = sdp->sd_max_height; | |
153 | } | |
154 | ||
155 | for (height = 0; height < max; height++) | |
156 | if (arr[height] >= size) | |
157 | break; | |
158 | ||
159 | return height; | |
160 | } | |
161 | ||
162 | /** | |
163 | * build_height - Build a metadata tree of the requested height | |
164 | * @ip: The GFS2 inode | |
165 | * @height: The height to build to | |
166 | * | |
167 | * This routine makes sure that the metadata tree is tall enough to hold | |
168 | * "size" bytes of data. | |
169 | * | |
170 | * Returns: errno | |
171 | */ | |
172 | ||
173 | static int build_height(struct gfs2_inode *ip, int height) | |
174 | { | |
175 | struct gfs2_sbd *sdp = ip->i_sbd; | |
176 | struct buffer_head *bh, *dibh; | |
177 | uint64_t block = 0, *bp; | |
178 | unsigned int x; | |
179 | int new_block; | |
180 | int error; | |
181 | ||
182 | while (ip->i_di.di_height < height) { | |
183 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
184 | if (error) | |
185 | return error; | |
186 | ||
187 | new_block = 0; | |
188 | bp = (uint64_t *)(dibh->b_data + sizeof(struct gfs2_dinode)); | |
189 | for (x = 0; x < sdp->sd_diptrs; x++, bp++) | |
190 | if (*bp) { | |
191 | new_block = 1; | |
192 | break; | |
193 | } | |
194 | ||
195 | if (new_block) { | |
196 | /* Get a new block, fill it with the old direct | |
197 | pointers, and write it out */ | |
198 | ||
199 | block = gfs2_alloc_meta(ip); | |
200 | ||
201 | bh = gfs2_meta_new(ip->i_gl, block); | |
d4e9c4c3 | 202 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
203 | gfs2_metatype_set(bh, |
204 | GFS2_METATYPE_IN, | |
205 | GFS2_FORMAT_IN); | |
206 | gfs2_buffer_copy_tail(bh, | |
207 | sizeof(struct gfs2_meta_header), | |
208 | dibh, sizeof(struct gfs2_dinode)); | |
209 | ||
210 | brelse(bh); | |
211 | } | |
212 | ||
213 | /* Set up the new direct pointer and write it out to disk */ | |
214 | ||
d4e9c4c3 | 215 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
216 | |
217 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
218 | ||
219 | if (new_block) { | |
568f4c96 SW |
220 | *(uint64_t *)(dibh->b_data + |
221 | sizeof(struct gfs2_dinode)) = | |
222 | cpu_to_be64(block); | |
b3b94faa DT |
223 | ip->i_di.di_blocks++; |
224 | } | |
225 | ||
226 | ip->i_di.di_height++; | |
227 | ||
228 | gfs2_dinode_out(&ip->i_di, dibh->b_data); | |
229 | brelse(dibh); | |
230 | } | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | /** | |
236 | * find_metapath - Find path through the metadata tree | |
237 | * @ip: The inode pointer | |
238 | * @mp: The metapath to return the result in | |
239 | * @block: The disk block to look up | |
240 | * | |
241 | * This routine returns a struct metapath structure that defines a path | |
242 | * through the metadata of inode "ip" to get to block "block". | |
243 | * | |
244 | * Example: | |
245 | * Given: "ip" is a height 3 file, "offset" is 101342453, and this is a | |
246 | * filesystem with a blocksize of 4096. | |
247 | * | |
248 | * find_metapath() would return a struct metapath structure set to: | |
249 | * mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48, | |
250 | * and mp_list[2] = 165. | |
251 | * | |
252 | * That means that in order to get to the block containing the byte at | |
253 | * offset 101342453, we would load the indirect block pointed to by pointer | |
254 | * 0 in the dinode. We would then load the indirect block pointed to by | |
255 | * pointer 48 in that indirect block. We would then load the data block | |
256 | * pointed to by pointer 165 in that indirect block. | |
257 | * | |
258 | * ---------------------------------------- | |
259 | * | Dinode | | | |
260 | * | | 4| | |
261 | * | |0 1 2 3 4 5 9| | |
262 | * | | 6| | |
263 | * ---------------------------------------- | |
264 | * | | |
265 | * | | |
266 | * V | |
267 | * ---------------------------------------- | |
268 | * | Indirect Block | | |
269 | * | 5| | |
270 | * | 4 4 4 4 4 5 5 1| | |
271 | * |0 5 6 7 8 9 0 1 2| | |
272 | * ---------------------------------------- | |
273 | * | | |
274 | * | | |
275 | * V | |
276 | * ---------------------------------------- | |
277 | * | Indirect Block | | |
278 | * | 1 1 1 1 1 5| | |
279 | * | 6 6 6 6 6 1| | |
280 | * |0 3 4 5 6 7 2| | |
281 | * ---------------------------------------- | |
282 | * | | |
283 | * | | |
284 | * V | |
285 | * ---------------------------------------- | |
286 | * | Data block containing offset | | |
287 | * | 101342453 | | |
288 | * | | | |
289 | * | | | |
290 | * ---------------------------------------- | |
291 | * | |
292 | */ | |
293 | ||
568f4c96 SW |
294 | static void find_metapath(struct gfs2_inode *ip, uint64_t block, |
295 | struct metapath *mp) | |
b3b94faa DT |
296 | { |
297 | struct gfs2_sbd *sdp = ip->i_sbd; | |
298 | uint64_t b = block; | |
299 | unsigned int i; | |
300 | ||
301 | for (i = ip->i_di.di_height; i--;) | |
302 | mp->mp_list[i] = (__u16)do_div(b, sdp->sd_inptrs); | |
303 | ||
304 | } | |
305 | ||
306 | /** | |
307 | * metapointer - Return pointer to start of metadata in a buffer | |
308 | * @bh: The buffer | |
309 | * @height: The metadata height (0 = dinode) | |
310 | * @mp: The metapath | |
311 | * | |
312 | * Return a pointer to the block number of the next height of the metadata | |
313 | * tree given a buffer containing the pointer to the current height of the | |
314 | * metadata tree. | |
315 | */ | |
316 | ||
317 | static inline uint64_t *metapointer(struct buffer_head *bh, | |
318 | unsigned int height, struct metapath *mp) | |
319 | { | |
320 | unsigned int head_size = (height > 0) ? | |
321 | sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode); | |
322 | ||
323 | return ((uint64_t *)(bh->b_data + head_size)) + mp->mp_list[height]; | |
324 | } | |
325 | ||
326 | /** | |
327 | * lookup_block - Get the next metadata block in metadata tree | |
328 | * @ip: The GFS2 inode | |
329 | * @bh: Buffer containing the pointers to metadata blocks | |
330 | * @height: The height of the tree (0 = dinode) | |
331 | * @mp: The metapath | |
332 | * @create: Non-zero if we may create a new meatdata block | |
333 | * @new: Used to indicate if we did create a new metadata block | |
334 | * @block: the returned disk block number | |
335 | * | |
336 | * Given a metatree, complete to a particular height, checks to see if the next | |
337 | * height of the tree exists. If not the next height of the tree is created. | |
338 | * The block number of the next height of the metadata tree is returned. | |
339 | * | |
340 | */ | |
341 | ||
342 | static void lookup_block(struct gfs2_inode *ip, struct buffer_head *bh, | |
343 | unsigned int height, struct metapath *mp, int create, | |
344 | int *new, uint64_t *block) | |
345 | { | |
346 | uint64_t *ptr = metapointer(bh, height, mp); | |
347 | ||
348 | if (*ptr) { | |
349 | *block = be64_to_cpu(*ptr); | |
350 | return; | |
351 | } | |
352 | ||
353 | *block = 0; | |
354 | ||
355 | if (!create) | |
356 | return; | |
357 | ||
358 | if (height == ip->i_di.di_height - 1 && | |
18ec7d5c | 359 | !gfs2_is_dir(ip)) |
b3b94faa DT |
360 | *block = gfs2_alloc_data(ip); |
361 | else | |
362 | *block = gfs2_alloc_meta(ip); | |
363 | ||
d4e9c4c3 | 364 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
365 | |
366 | *ptr = cpu_to_be64(*block); | |
367 | ip->i_di.di_blocks++; | |
368 | ||
369 | *new = 1; | |
370 | } | |
371 | ||
372 | /** | |
373 | * gfs2_block_map - Map a block from an inode to a disk block | |
374 | * @ip: The GFS2 inode | |
375 | * @lblock: The logical block number | |
376 | * @new: Value/Result argument (1 = may create/did create new blocks) | |
377 | * @dblock: the disk block number of the start of an extent | |
378 | * @extlen: the size of the extent | |
379 | * | |
380 | * Find the block number on the current device which corresponds to an | |
381 | * inode's block. If the block had to be created, "new" will be set. | |
382 | * | |
383 | * Returns: errno | |
384 | */ | |
385 | ||
386 | int gfs2_block_map(struct gfs2_inode *ip, uint64_t lblock, int *new, | |
387 | uint64_t *dblock, uint32_t *extlen) | |
388 | { | |
389 | struct gfs2_sbd *sdp = ip->i_sbd; | |
390 | struct buffer_head *bh; | |
391 | struct metapath mp; | |
392 | int create = *new; | |
393 | unsigned int bsize; | |
394 | unsigned int height; | |
395 | unsigned int end_of_metadata; | |
396 | unsigned int x; | |
397 | int error = 0; | |
398 | ||
399 | *new = 0; | |
400 | *dblock = 0; | |
401 | if (extlen) | |
402 | *extlen = 0; | |
403 | ||
404 | if (create) | |
405 | down_write(&ip->i_rw_mutex); | |
406 | else | |
407 | down_read(&ip->i_rw_mutex); | |
408 | ||
409 | if (gfs2_assert_warn(sdp, !gfs2_is_stuffed(ip))) | |
410 | goto out; | |
411 | ||
18ec7d5c | 412 | bsize = (gfs2_is_dir(ip)) ? sdp->sd_jbsize : sdp->sd_sb.sb_bsize; |
b3b94faa DT |
413 | |
414 | height = calc_tree_height(ip, (lblock + 1) * bsize); | |
415 | if (ip->i_di.di_height < height) { | |
416 | if (!create) | |
417 | goto out; | |
418 | ||
419 | error = build_height(ip, height); | |
420 | if (error) | |
421 | goto out; | |
422 | } | |
423 | ||
424 | find_metapath(ip, lblock, &mp); | |
425 | end_of_metadata = ip->i_di.di_height - 1; | |
426 | ||
427 | error = gfs2_meta_inode_buffer(ip, &bh); | |
428 | if (error) | |
429 | goto out; | |
430 | ||
431 | for (x = 0; x < end_of_metadata; x++) { | |
432 | lookup_block(ip, bh, x, &mp, create, new, dblock); | |
433 | brelse(bh); | |
434 | if (!*dblock) | |
435 | goto out; | |
436 | ||
437 | error = gfs2_meta_indirect_buffer(ip, x+1, *dblock, *new, &bh); | |
438 | if (error) | |
439 | goto out; | |
440 | } | |
441 | ||
442 | lookup_block(ip, bh, end_of_metadata, &mp, create, new, dblock); | |
443 | ||
444 | if (extlen && *dblock) { | |
445 | *extlen = 1; | |
446 | ||
447 | if (!*new) { | |
448 | uint64_t tmp_dblock; | |
449 | int tmp_new; | |
450 | unsigned int nptrs; | |
451 | ||
452 | nptrs = (end_of_metadata) ? sdp->sd_inptrs : | |
453 | sdp->sd_diptrs; | |
454 | ||
455 | while (++mp.mp_list[end_of_metadata] < nptrs) { | |
456 | lookup_block(ip, bh, end_of_metadata, &mp, | |
457 | 0, &tmp_new, &tmp_dblock); | |
458 | ||
459 | if (*dblock + *extlen != tmp_dblock) | |
460 | break; | |
461 | ||
462 | (*extlen)++; | |
463 | } | |
464 | } | |
465 | } | |
466 | ||
467 | brelse(bh); | |
468 | ||
469 | if (*new) { | |
470 | error = gfs2_meta_inode_buffer(ip, &bh); | |
471 | if (!error) { | |
d4e9c4c3 | 472 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
473 | gfs2_dinode_out(&ip->i_di, bh->b_data); |
474 | brelse(bh); | |
475 | } | |
476 | } | |
477 | ||
478 | out: | |
479 | if (create) | |
480 | up_write(&ip->i_rw_mutex); | |
481 | else | |
482 | up_read(&ip->i_rw_mutex); | |
483 | ||
484 | return error; | |
485 | } | |
486 | ||
487 | /** | |
488 | * recursive_scan - recursively scan through the end of a file | |
489 | * @ip: the inode | |
490 | * @dibh: the dinode buffer | |
491 | * @mp: the path through the metadata to the point to start | |
492 | * @height: the height the recursion is at | |
493 | * @block: the indirect block to look at | |
494 | * @first: 1 if this is the first block | |
495 | * @bc: the call to make for each piece of metadata | |
496 | * @data: data opaque to this function to pass to @bc | |
497 | * | |
498 | * When this is first called @height and @block should be zero and | |
499 | * @first should be 1. | |
500 | * | |
501 | * Returns: errno | |
502 | */ | |
503 | ||
504 | static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh, | |
505 | struct metapath *mp, unsigned int height, | |
506 | uint64_t block, int first, block_call_t bc, | |
507 | void *data) | |
508 | { | |
509 | struct gfs2_sbd *sdp = ip->i_sbd; | |
510 | struct buffer_head *bh = NULL; | |
511 | uint64_t *top, *bottom; | |
512 | uint64_t bn; | |
513 | int error; | |
514 | int mh_size = sizeof(struct gfs2_meta_header); | |
515 | ||
516 | if (!height) { | |
517 | error = gfs2_meta_inode_buffer(ip, &bh); | |
518 | if (error) | |
519 | return error; | |
520 | dibh = bh; | |
521 | ||
522 | top = (uint64_t *)(bh->b_data + sizeof(struct gfs2_dinode)) + | |
523 | mp->mp_list[0]; | |
524 | bottom = (uint64_t *)(bh->b_data + sizeof(struct gfs2_dinode)) + | |
525 | sdp->sd_diptrs; | |
526 | } else { | |
527 | error = gfs2_meta_indirect_buffer(ip, height, block, 0, &bh); | |
528 | if (error) | |
529 | return error; | |
530 | ||
531 | top = (uint64_t *)(bh->b_data + mh_size) + | |
532 | ((first) ? mp->mp_list[height] : 0); | |
533 | ||
534 | bottom = (uint64_t *)(bh->b_data + mh_size) + sdp->sd_inptrs; | |
535 | } | |
536 | ||
537 | error = bc(ip, dibh, bh, top, bottom, height, data); | |
538 | if (error) | |
539 | goto out; | |
540 | ||
541 | if (height < ip->i_di.di_height - 1) | |
542 | for (; top < bottom; top++, first = 0) { | |
543 | if (!*top) | |
544 | continue; | |
545 | ||
546 | bn = be64_to_cpu(*top); | |
547 | ||
548 | error = recursive_scan(ip, dibh, mp, height + 1, bn, | |
549 | first, bc, data); | |
550 | if (error) | |
551 | break; | |
552 | } | |
553 | ||
554 | out: | |
555 | brelse(bh); | |
556 | ||
557 | return error; | |
558 | } | |
559 | ||
560 | /** | |
561 | * do_strip - Look for a layer a particular layer of the file and strip it off | |
562 | * @ip: the inode | |
563 | * @dibh: the dinode buffer | |
564 | * @bh: A buffer of pointers | |
565 | * @top: The first pointer in the buffer | |
566 | * @bottom: One more than the last pointer | |
567 | * @height: the height this buffer is at | |
568 | * @data: a pointer to a struct strip_mine | |
569 | * | |
570 | * Returns: errno | |
571 | */ | |
572 | ||
573 | static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh, | |
574 | struct buffer_head *bh, uint64_t *top, uint64_t *bottom, | |
575 | unsigned int height, void *data) | |
576 | { | |
577 | struct strip_mine *sm = (struct strip_mine *)data; | |
578 | struct gfs2_sbd *sdp = ip->i_sbd; | |
579 | struct gfs2_rgrp_list rlist; | |
580 | uint64_t bn, bstart; | |
581 | uint32_t blen; | |
582 | uint64_t *p; | |
583 | unsigned int rg_blocks = 0; | |
584 | int metadata; | |
585 | unsigned int revokes = 0; | |
586 | int x; | |
587 | int error; | |
588 | ||
589 | if (!*top) | |
590 | sm->sm_first = 0; | |
591 | ||
592 | if (height != sm->sm_height) | |
593 | return 0; | |
594 | ||
595 | if (sm->sm_first) { | |
596 | top++; | |
597 | sm->sm_first = 0; | |
598 | } | |
599 | ||
18ec7d5c | 600 | metadata = (height != ip->i_di.di_height - 1); |
b3b94faa DT |
601 | if (metadata) |
602 | revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs; | |
603 | ||
604 | error = gfs2_rindex_hold(sdp, &ip->i_alloc.al_ri_gh); | |
605 | if (error) | |
606 | return error; | |
607 | ||
608 | memset(&rlist, 0, sizeof(struct gfs2_rgrp_list)); | |
609 | bstart = 0; | |
610 | blen = 0; | |
611 | ||
612 | for (p = top; p < bottom; p++) { | |
613 | if (!*p) | |
614 | continue; | |
615 | ||
616 | bn = be64_to_cpu(*p); | |
617 | ||
618 | if (bstart + blen == bn) | |
619 | blen++; | |
620 | else { | |
621 | if (bstart) | |
622 | gfs2_rlist_add(sdp, &rlist, bstart); | |
623 | ||
624 | bstart = bn; | |
625 | blen = 1; | |
626 | } | |
627 | } | |
628 | ||
629 | if (bstart) | |
630 | gfs2_rlist_add(sdp, &rlist, bstart); | |
631 | else | |
632 | goto out; /* Nothing to do */ | |
633 | ||
634 | gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, 0); | |
635 | ||
636 | for (x = 0; x < rlist.rl_rgrps; x++) { | |
637 | struct gfs2_rgrpd *rgd; | |
5c676f6d | 638 | rgd = rlist.rl_ghs[x].gh_gl->gl_object; |
b3b94faa DT |
639 | rg_blocks += rgd->rd_ri.ri_length; |
640 | } | |
641 | ||
642 | error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs); | |
643 | if (error) | |
644 | goto out_rlist; | |
645 | ||
646 | error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + | |
647 | RES_INDIRECT + RES_STATFS + RES_QUOTA, | |
648 | revokes); | |
649 | if (error) | |
650 | goto out_rg_gunlock; | |
651 | ||
652 | down_write(&ip->i_rw_mutex); | |
653 | ||
d4e9c4c3 SW |
654 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
655 | gfs2_trans_add_bh(ip->i_gl, bh, 1); | |
b3b94faa DT |
656 | |
657 | bstart = 0; | |
658 | blen = 0; | |
659 | ||
660 | for (p = top; p < bottom; p++) { | |
661 | if (!*p) | |
662 | continue; | |
663 | ||
664 | bn = be64_to_cpu(*p); | |
665 | ||
666 | if (bstart + blen == bn) | |
667 | blen++; | |
668 | else { | |
669 | if (bstart) { | |
670 | if (metadata) | |
671 | gfs2_free_meta(ip, bstart, blen); | |
672 | else | |
673 | gfs2_free_data(ip, bstart, blen); | |
674 | } | |
675 | ||
676 | bstart = bn; | |
677 | blen = 1; | |
678 | } | |
679 | ||
680 | *p = 0; | |
681 | if (!ip->i_di.di_blocks) | |
682 | gfs2_consist_inode(ip); | |
683 | ip->i_di.di_blocks--; | |
684 | } | |
685 | if (bstart) { | |
686 | if (metadata) | |
687 | gfs2_free_meta(ip, bstart, blen); | |
688 | else | |
689 | gfs2_free_data(ip, bstart, blen); | |
690 | } | |
691 | ||
692 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); | |
693 | ||
694 | gfs2_dinode_out(&ip->i_di, dibh->b_data); | |
695 | ||
696 | up_write(&ip->i_rw_mutex); | |
697 | ||
698 | gfs2_trans_end(sdp); | |
699 | ||
700 | out_rg_gunlock: | |
701 | gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs); | |
702 | ||
703 | out_rlist: | |
704 | gfs2_rlist_free(&rlist); | |
705 | ||
706 | out: | |
707 | gfs2_glock_dq_uninit(&ip->i_alloc.al_ri_gh); | |
708 | ||
709 | return error; | |
710 | } | |
711 | ||
712 | /** | |
713 | * do_grow - Make a file look bigger than it is | |
714 | * @ip: the inode | |
715 | * @size: the size to set the file to | |
716 | * | |
717 | * Called with an exclusive lock on @ip. | |
718 | * | |
719 | * Returns: errno | |
720 | */ | |
721 | ||
722 | static int do_grow(struct gfs2_inode *ip, uint64_t size) | |
723 | { | |
724 | struct gfs2_sbd *sdp = ip->i_sbd; | |
725 | struct gfs2_alloc *al; | |
726 | struct buffer_head *dibh; | |
727 | unsigned int h; | |
728 | int error; | |
729 | ||
730 | al = gfs2_alloc_get(ip); | |
731 | ||
732 | error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
733 | if (error) | |
734 | goto out; | |
735 | ||
736 | error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid); | |
737 | if (error) | |
738 | goto out_gunlock_q; | |
739 | ||
740 | al->al_requested = sdp->sd_max_height + RES_DATA; | |
741 | ||
742 | error = gfs2_inplace_reserve(ip); | |
743 | if (error) | |
744 | goto out_gunlock_q; | |
745 | ||
746 | error = gfs2_trans_begin(sdp, | |
747 | sdp->sd_max_height + al->al_rgd->rd_ri.ri_length + | |
748 | RES_JDATA + RES_DINODE + RES_STATFS + RES_QUOTA, 0); | |
749 | if (error) | |
750 | goto out_ipres; | |
751 | ||
752 | if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { | |
753 | if (gfs2_is_stuffed(ip)) { | |
754 | error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_page, | |
755 | NULL); | |
756 | if (error) | |
757 | goto out_end_trans; | |
758 | } | |
759 | ||
760 | h = calc_tree_height(ip, size); | |
761 | if (ip->i_di.di_height < h) { | |
762 | down_write(&ip->i_rw_mutex); | |
763 | error = build_height(ip, h); | |
764 | up_write(&ip->i_rw_mutex); | |
765 | if (error) | |
766 | goto out_end_trans; | |
767 | } | |
768 | } | |
769 | ||
770 | ip->i_di.di_size = size; | |
771 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); | |
772 | ||
773 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
774 | if (error) | |
775 | goto out_end_trans; | |
776 | ||
d4e9c4c3 | 777 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
778 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
779 | brelse(dibh); | |
780 | ||
781 | out_end_trans: | |
782 | gfs2_trans_end(sdp); | |
783 | ||
784 | out_ipres: | |
785 | gfs2_inplace_release(ip); | |
786 | ||
787 | out_gunlock_q: | |
788 | gfs2_quota_unlock(ip); | |
789 | ||
790 | out: | |
791 | gfs2_alloc_put(ip); | |
792 | ||
793 | return error; | |
794 | } | |
795 | ||
aa6a85a9 | 796 | static int trunc_start(struct gfs2_inode *ip, uint64_t size) |
b3b94faa DT |
797 | { |
798 | struct gfs2_sbd *sdp = ip->i_sbd; | |
799 | struct buffer_head *dibh; | |
800 | int journaled = gfs2_is_jdata(ip); | |
801 | int error; | |
802 | ||
803 | error = gfs2_trans_begin(sdp, | |
804 | RES_DINODE + ((journaled) ? RES_JDATA : 0), 0); | |
805 | if (error) | |
806 | return error; | |
807 | ||
808 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
809 | if (error) | |
810 | goto out; | |
811 | ||
812 | if (gfs2_is_stuffed(ip)) { | |
813 | ip->i_di.di_size = size; | |
814 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); | |
d4e9c4c3 | 815 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
816 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
817 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + size); | |
818 | error = 1; | |
819 | ||
820 | } else { | |
18ec7d5c | 821 | if (size & (uint64_t)(sdp->sd_sb.sb_bsize - 1)) |
257f9b4e | 822 | error = gfs2_block_truncate_page(ip->i_vnode->i_mapping); |
b3b94faa DT |
823 | |
824 | if (!error) { | |
825 | ip->i_di.di_size = size; | |
826 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); | |
827 | ip->i_di.di_flags |= GFS2_DIF_TRUNC_IN_PROG; | |
d4e9c4c3 | 828 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
829 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
830 | } | |
831 | } | |
832 | ||
833 | brelse(dibh); | |
834 | ||
835 | out: | |
836 | gfs2_trans_end(sdp); | |
837 | ||
838 | return error; | |
839 | } | |
840 | ||
841 | static int trunc_dealloc(struct gfs2_inode *ip, uint64_t size) | |
842 | { | |
843 | unsigned int height = ip->i_di.di_height; | |
844 | uint64_t lblock; | |
845 | struct metapath mp; | |
846 | int error; | |
847 | ||
848 | if (!size) | |
849 | lblock = 0; | |
18ec7d5c | 850 | else |
b3b94faa DT |
851 | lblock = (size - 1) >> ip->i_sbd->sd_sb.sb_bsize_shift; |
852 | ||
853 | find_metapath(ip, lblock, &mp); | |
854 | gfs2_alloc_get(ip); | |
855 | ||
856 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
857 | if (error) | |
858 | goto out; | |
859 | ||
860 | while (height--) { | |
861 | struct strip_mine sm; | |
862 | sm.sm_first = !!size; | |
863 | sm.sm_height = height; | |
864 | ||
865 | error = recursive_scan(ip, NULL, &mp, 0, 0, 1, do_strip, &sm); | |
866 | if (error) | |
867 | break; | |
868 | } | |
869 | ||
870 | gfs2_quota_unhold(ip); | |
871 | ||
872 | out: | |
873 | gfs2_alloc_put(ip); | |
874 | return error; | |
875 | } | |
876 | ||
877 | static int trunc_end(struct gfs2_inode *ip) | |
878 | { | |
879 | struct gfs2_sbd *sdp = ip->i_sbd; | |
880 | struct buffer_head *dibh; | |
881 | int error; | |
882 | ||
883 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
884 | if (error) | |
885 | return error; | |
886 | ||
887 | down_write(&ip->i_rw_mutex); | |
888 | ||
889 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
890 | if (error) | |
891 | goto out; | |
892 | ||
893 | if (!ip->i_di.di_size) { | |
894 | ip->i_di.di_height = 0; | |
895 | ip->i_di.di_goal_meta = | |
896 | ip->i_di.di_goal_data = | |
897 | ip->i_num.no_addr; | |
898 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
899 | } | |
900 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); | |
901 | ip->i_di.di_flags &= ~GFS2_DIF_TRUNC_IN_PROG; | |
902 | ||
d4e9c4c3 | 903 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
904 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
905 | brelse(dibh); | |
906 | ||
907 | out: | |
908 | up_write(&ip->i_rw_mutex); | |
909 | ||
910 | gfs2_trans_end(sdp); | |
911 | ||
912 | return error; | |
913 | } | |
914 | ||
915 | /** | |
916 | * do_shrink - make a file smaller | |
917 | * @ip: the inode | |
918 | * @size: the size to make the file | |
919 | * @truncator: function to truncate the last partial block | |
920 | * | |
921 | * Called with an exclusive lock on @ip. | |
922 | * | |
923 | * Returns: errno | |
924 | */ | |
925 | ||
aa6a85a9 | 926 | static int do_shrink(struct gfs2_inode *ip, uint64_t size) |
b3b94faa DT |
927 | { |
928 | int error; | |
929 | ||
aa6a85a9 | 930 | error = trunc_start(ip, size); |
b3b94faa DT |
931 | if (error < 0) |
932 | return error; | |
933 | if (error > 0) | |
934 | return 0; | |
935 | ||
936 | error = trunc_dealloc(ip, size); | |
937 | if (!error) | |
938 | error = trunc_end(ip); | |
939 | ||
940 | return error; | |
941 | } | |
942 | ||
943 | /** | |
666a2c53 | 944 | * gfs2_truncatei - make a file a given size |
b3b94faa DT |
945 | * @ip: the inode |
946 | * @size: the size to make the file | |
947 | * @truncator: function to truncate the last partial block | |
948 | * | |
949 | * The file size can grow, shrink, or stay the same size. | |
950 | * | |
951 | * Returns: errno | |
952 | */ | |
953 | ||
aa6a85a9 | 954 | int gfs2_truncatei(struct gfs2_inode *ip, uint64_t size) |
b3b94faa DT |
955 | { |
956 | int error; | |
957 | ||
958 | if (gfs2_assert_warn(ip->i_sbd, S_ISREG(ip->i_di.di_mode))) | |
959 | return -EINVAL; | |
960 | ||
961 | if (size > ip->i_di.di_size) | |
962 | error = do_grow(ip, size); | |
963 | else | |
aa6a85a9 | 964 | error = do_shrink(ip, size); |
b3b94faa DT |
965 | |
966 | return error; | |
967 | } | |
968 | ||
969 | int gfs2_truncatei_resume(struct gfs2_inode *ip) | |
970 | { | |
971 | int error; | |
972 | error = trunc_dealloc(ip, ip->i_di.di_size); | |
973 | if (!error) | |
974 | error = trunc_end(ip); | |
975 | return error; | |
976 | } | |
977 | ||
978 | int gfs2_file_dealloc(struct gfs2_inode *ip) | |
979 | { | |
980 | return trunc_dealloc(ip, 0); | |
981 | } | |
982 | ||
983 | /** | |
984 | * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file | |
985 | * @ip: the file | |
986 | * @len: the number of bytes to be written to the file | |
987 | * @data_blocks: returns the number of data blocks required | |
988 | * @ind_blocks: returns the number of indirect blocks required | |
989 | * | |
990 | */ | |
991 | ||
992 | void gfs2_write_calc_reserv(struct gfs2_inode *ip, unsigned int len, | |
993 | unsigned int *data_blocks, unsigned int *ind_blocks) | |
994 | { | |
995 | struct gfs2_sbd *sdp = ip->i_sbd; | |
996 | unsigned int tmp; | |
997 | ||
18ec7d5c | 998 | if (gfs2_is_dir(ip)) { |
5c676f6d | 999 | *data_blocks = DIV_ROUND_UP(len, sdp->sd_jbsize) + 2; |
b3b94faa DT |
1000 | *ind_blocks = 3 * (sdp->sd_max_jheight - 1); |
1001 | } else { | |
1002 | *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3; | |
1003 | *ind_blocks = 3 * (sdp->sd_max_height - 1); | |
1004 | } | |
1005 | ||
1006 | for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) { | |
5c676f6d | 1007 | tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); |
b3b94faa DT |
1008 | *ind_blocks += tmp; |
1009 | } | |
1010 | } | |
1011 | ||
1012 | /** | |
1013 | * gfs2_write_alloc_required - figure out if a write will require an allocation | |
1014 | * @ip: the file being written to | |
1015 | * @offset: the offset to write to | |
1016 | * @len: the number of bytes being written | |
1017 | * @alloc_required: set to 1 if an alloc is required, 0 otherwise | |
1018 | * | |
1019 | * Returns: errno | |
1020 | */ | |
1021 | ||
1022 | int gfs2_write_alloc_required(struct gfs2_inode *ip, uint64_t offset, | |
1023 | unsigned int len, int *alloc_required) | |
1024 | { | |
1025 | struct gfs2_sbd *sdp = ip->i_sbd; | |
1026 | uint64_t lblock, lblock_stop, dblock; | |
1027 | uint32_t extlen; | |
1028 | int new = 0; | |
1029 | int error = 0; | |
1030 | ||
1031 | *alloc_required = 0; | |
1032 | ||
1033 | if (!len) | |
1034 | return 0; | |
1035 | ||
1036 | if (gfs2_is_stuffed(ip)) { | |
1037 | if (offset + len > | |
1038 | sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) | |
1039 | *alloc_required = 1; | |
1040 | return 0; | |
1041 | } | |
1042 | ||
18ec7d5c | 1043 | if (gfs2_is_dir(ip)) { |
b3b94faa DT |
1044 | unsigned int bsize = sdp->sd_jbsize; |
1045 | lblock = offset; | |
1046 | do_div(lblock, bsize); | |
1047 | lblock_stop = offset + len + bsize - 1; | |
1048 | do_div(lblock_stop, bsize); | |
1049 | } else { | |
1050 | unsigned int shift = sdp->sd_sb.sb_bsize_shift; | |
1051 | lblock = offset >> shift; | |
1052 | lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift; | |
1053 | } | |
1054 | ||
1055 | for (; lblock < lblock_stop; lblock += extlen) { | |
1056 | error = gfs2_block_map(ip, lblock, &new, &dblock, &extlen); | |
1057 | if (error) | |
1058 | return error; | |
1059 | ||
1060 | if (!dblock) { | |
1061 | *alloc_required = 1; | |
1062 | return 0; | |
1063 | } | |
1064 | } | |
1065 | ||
1066 | return 0; | |
1067 | } | |
1068 |