]>
Commit | Line | Data |
---|---|---|
b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
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 | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
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 | |
18 | #include "gfs2.h" | |
5c676f6d SW |
19 | #include "lm_interface.h" |
20 | #include "incore.h" | |
b3b94faa DT |
21 | #include "bmap.h" |
22 | #include "glock.h" | |
23 | #include "inode.h" | |
b3b94faa | 24 | #include "meta_io.h" |
b3b94faa DT |
25 | #include "quota.h" |
26 | #include "rgrp.h" | |
27 | #include "trans.h" | |
18ec7d5c | 28 | #include "dir.h" |
5c676f6d | 29 | #include "util.h" |
ba7f7290 | 30 | #include "ops_address.h" |
b3b94faa DT |
31 | |
32 | /* This doesn't need to be that large as max 64 bit pointers in a 4k | |
33 | * block is 512, so __u16 is fine for that. It saves stack space to | |
34 | * keep it small. | |
35 | */ | |
36 | struct metapath { | |
37 | __u16 mp_list[GFS2_MAX_META_HEIGHT]; | |
38 | }; | |
39 | ||
40 | typedef int (*block_call_t) (struct gfs2_inode *ip, struct buffer_head *dibh, | |
cd915493 SW |
41 | struct buffer_head *bh, u64 *top, |
42 | u64 *bottom, unsigned int height, | |
b3b94faa DT |
43 | void *data); |
44 | ||
45 | struct strip_mine { | |
46 | int sm_first; | |
47 | unsigned int sm_height; | |
48 | }; | |
49 | ||
f25ef0c1 SW |
50 | /** |
51 | * gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page | |
52 | * @ip: the inode | |
53 | * @dibh: the dinode buffer | |
54 | * @block: the block number that was allocated | |
55 | * @private: any locked page held by the caller process | |
56 | * | |
57 | * Returns: errno | |
58 | */ | |
59 | ||
60 | static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh, | |
cd915493 | 61 | u64 block, struct page *page) |
f25ef0c1 SW |
62 | { |
63 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); | |
64 | struct inode *inode = &ip->i_inode; | |
65 | struct buffer_head *bh; | |
66 | int release = 0; | |
67 | ||
68 | if (!page || page->index) { | |
69 | page = grab_cache_page(inode->i_mapping, 0); | |
70 | if (!page) | |
71 | return -ENOMEM; | |
72 | release = 1; | |
73 | } | |
74 | ||
75 | if (!PageUptodate(page)) { | |
76 | void *kaddr = kmap(page); | |
77 | ||
78 | memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), | |
79 | ip->i_di.di_size); | |
80 | memset(kaddr + ip->i_di.di_size, 0, | |
81 | PAGE_CACHE_SIZE - ip->i_di.di_size); | |
82 | kunmap(page); | |
83 | ||
84 | SetPageUptodate(page); | |
85 | } | |
86 | ||
87 | if (!page_has_buffers(page)) | |
88 | create_empty_buffers(page, 1 << inode->i_blkbits, | |
89 | (1 << BH_Uptodate)); | |
90 | ||
91 | bh = page_buffers(page); | |
92 | ||
93 | if (!buffer_mapped(bh)) | |
94 | map_bh(bh, inode->i_sb, block); | |
95 | ||
96 | set_buffer_uptodate(bh); | |
75d3b817 | 97 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) |
f25ef0c1 SW |
98 | gfs2_trans_add_bh(ip->i_gl, bh, 0); |
99 | mark_buffer_dirty(bh); | |
100 | ||
101 | if (release) { | |
102 | unlock_page(page); | |
103 | page_cache_release(page); | |
104 | } | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
b3b94faa DT |
109 | /** |
110 | * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big | |
111 | * @ip: The GFS2 inode to unstuff | |
112 | * @unstuffer: the routine that handles unstuffing a non-zero length file | |
113 | * @private: private data for the unstuffer | |
114 | * | |
115 | * This routine unstuffs a dinode and returns it to a "normal" state such | |
116 | * that the height can be grown in the traditional way. | |
117 | * | |
118 | * Returns: errno | |
119 | */ | |
120 | ||
f25ef0c1 | 121 | int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page) |
b3b94faa DT |
122 | { |
123 | struct buffer_head *bh, *dibh; | |
cd915493 | 124 | u64 block = 0; |
18ec7d5c | 125 | int isdir = gfs2_is_dir(ip); |
b3b94faa DT |
126 | int error; |
127 | ||
128 | down_write(&ip->i_rw_mutex); | |
129 | ||
130 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
131 | if (error) | |
132 | goto out; | |
133 | ||
134 | if (ip->i_di.di_size) { | |
135 | /* Get a free block, fill it with the stuffed data, | |
136 | and write it out to disk */ | |
137 | ||
18ec7d5c | 138 | if (isdir) { |
b3b94faa DT |
139 | block = gfs2_alloc_meta(ip); |
140 | ||
61e085a8 | 141 | error = gfs2_dir_get_new_buffer(ip, block, &bh); |
b3b94faa DT |
142 | if (error) |
143 | goto out_brelse; | |
144 | gfs2_buffer_copy_tail(bh, | |
145 | sizeof(struct gfs2_meta_header), | |
146 | dibh, sizeof(struct gfs2_dinode)); | |
147 | brelse(bh); | |
148 | } else { | |
149 | block = gfs2_alloc_data(ip); | |
150 | ||
f25ef0c1 | 151 | error = gfs2_unstuffer_page(ip, dibh, block, page); |
b3b94faa DT |
152 | if (error) |
153 | goto out_brelse; | |
154 | } | |
155 | } | |
156 | ||
157 | /* Set up the pointer to the new block */ | |
158 | ||
d4e9c4c3 | 159 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
160 | |
161 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
162 | ||
163 | if (ip->i_di.di_size) { | |
cd915493 | 164 | *(u64 *)(dibh->b_data + sizeof(struct gfs2_dinode)) = |
568f4c96 | 165 | cpu_to_be64(block); |
b3b94faa DT |
166 | ip->i_di.di_blocks++; |
167 | } | |
168 | ||
169 | ip->i_di.di_height = 1; | |
170 | ||
171 | gfs2_dinode_out(&ip->i_di, dibh->b_data); | |
172 | ||
a91ea69f | 173 | out_brelse: |
b3b94faa | 174 | brelse(dibh); |
a91ea69f | 175 | out: |
b3b94faa | 176 | up_write(&ip->i_rw_mutex); |
b3b94faa DT |
177 | return error; |
178 | } | |
179 | ||
180 | /** | |
181 | * calc_tree_height - Calculate the height of a metadata tree | |
182 | * @ip: The GFS2 inode | |
183 | * @size: The proposed size of the file | |
184 | * | |
185 | * Work out how tall a metadata tree needs to be in order to accommodate a | |
186 | * file of a particular size. If size is less than the current size of | |
187 | * the inode, then the current size of the inode is used instead of the | |
188 | * supplied one. | |
189 | * | |
190 | * Returns: the height the tree should be | |
191 | */ | |
192 | ||
cd915493 | 193 | static unsigned int calc_tree_height(struct gfs2_inode *ip, u64 size) |
b3b94faa | 194 | { |
feaa7bba | 195 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
cd915493 | 196 | u64 *arr; |
b3b94faa DT |
197 | unsigned int max, height; |
198 | ||
199 | if (ip->i_di.di_size > size) | |
200 | size = ip->i_di.di_size; | |
201 | ||
18ec7d5c | 202 | if (gfs2_is_dir(ip)) { |
b3b94faa DT |
203 | arr = sdp->sd_jheightsize; |
204 | max = sdp->sd_max_jheight; | |
205 | } else { | |
206 | arr = sdp->sd_heightsize; | |
207 | max = sdp->sd_max_height; | |
208 | } | |
209 | ||
210 | for (height = 0; height < max; height++) | |
211 | if (arr[height] >= size) | |
212 | break; | |
213 | ||
214 | return height; | |
215 | } | |
216 | ||
217 | /** | |
218 | * build_height - Build a metadata tree of the requested height | |
219 | * @ip: The GFS2 inode | |
220 | * @height: The height to build to | |
221 | * | |
b3b94faa DT |
222 | * |
223 | * Returns: errno | |
224 | */ | |
225 | ||
e90c01e1 | 226 | static int build_height(struct inode *inode, unsigned height) |
b3b94faa | 227 | { |
feaa7bba | 228 | struct gfs2_inode *ip = GFS2_I(inode); |
e90c01e1 SW |
229 | unsigned new_height = height - ip->i_di.di_height; |
230 | struct buffer_head *dibh; | |
231 | struct buffer_head *blocks[GFS2_MAX_META_HEIGHT]; | |
b3b94faa | 232 | int error; |
e90c01e1 SW |
233 | u64 *bp; |
234 | u64 bn; | |
235 | unsigned n; | |
b3b94faa | 236 | |
e90c01e1 SW |
237 | if (height <= ip->i_di.di_height) |
238 | return 0; | |
b3b94faa | 239 | |
e90c01e1 SW |
240 | error = gfs2_meta_inode_buffer(ip, &dibh); |
241 | if (error) | |
242 | return error; | |
b3b94faa | 243 | |
e90c01e1 SW |
244 | for(n = 0; n < new_height; n++) { |
245 | bn = gfs2_alloc_meta(ip); | |
246 | blocks[n] = gfs2_meta_new(ip->i_gl, bn); | |
247 | gfs2_trans_add_bh(ip->i_gl, blocks[n], 1); | |
248 | } | |
249 | ||
250 | n = 0; | |
251 | bn = blocks[0]->b_blocknr; | |
252 | if (new_height > 1) { | |
253 | for(; n < new_height-1; n++) { | |
254 | gfs2_metatype_set(blocks[n], GFS2_METATYPE_IN, | |
b3b94faa | 255 | GFS2_FORMAT_IN); |
e90c01e1 SW |
256 | gfs2_buffer_clear_tail(blocks[n], |
257 | sizeof(struct gfs2_meta_header)); | |
258 | bp = (u64 *)(blocks[n]->b_data + | |
259 | sizeof(struct gfs2_meta_header)); | |
260 | *bp = cpu_to_be64(blocks[n+1]->b_blocknr); | |
261 | brelse(blocks[n]); | |
262 | blocks[n] = NULL; | |
b3b94faa | 263 | } |
b3b94faa | 264 | } |
e90c01e1 SW |
265 | gfs2_metatype_set(blocks[n], GFS2_METATYPE_IN, GFS2_FORMAT_IN); |
266 | gfs2_buffer_copy_tail(blocks[n], sizeof(struct gfs2_meta_header), | |
267 | dibh, sizeof(struct gfs2_dinode)); | |
268 | brelse(blocks[n]); | |
269 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
270 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
271 | bp = (u64 *)(dibh->b_data + sizeof(struct gfs2_dinode)); | |
272 | *bp = cpu_to_be64(bn); | |
273 | ip->i_di.di_height += new_height; | |
274 | ip->i_di.di_blocks += new_height; | |
275 | gfs2_dinode_out(&ip->i_di, dibh->b_data); | |
276 | brelse(dibh); | |
277 | return error; | |
b3b94faa DT |
278 | } |
279 | ||
280 | /** | |
281 | * find_metapath - Find path through the metadata tree | |
282 | * @ip: The inode pointer | |
283 | * @mp: The metapath to return the result in | |
284 | * @block: The disk block to look up | |
285 | * | |
286 | * This routine returns a struct metapath structure that defines a path | |
287 | * through the metadata of inode "ip" to get to block "block". | |
288 | * | |
289 | * Example: | |
290 | * Given: "ip" is a height 3 file, "offset" is 101342453, and this is a | |
291 | * filesystem with a blocksize of 4096. | |
292 | * | |
293 | * find_metapath() would return a struct metapath structure set to: | |
294 | * mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48, | |
295 | * and mp_list[2] = 165. | |
296 | * | |
297 | * That means that in order to get to the block containing the byte at | |
298 | * offset 101342453, we would load the indirect block pointed to by pointer | |
299 | * 0 in the dinode. We would then load the indirect block pointed to by | |
300 | * pointer 48 in that indirect block. We would then load the data block | |
301 | * pointed to by pointer 165 in that indirect block. | |
302 | * | |
303 | * ---------------------------------------- | |
304 | * | Dinode | | | |
305 | * | | 4| | |
306 | * | |0 1 2 3 4 5 9| | |
307 | * | | 6| | |
308 | * ---------------------------------------- | |
309 | * | | |
310 | * | | |
311 | * V | |
312 | * ---------------------------------------- | |
313 | * | Indirect Block | | |
314 | * | 5| | |
315 | * | 4 4 4 4 4 5 5 1| | |
316 | * |0 5 6 7 8 9 0 1 2| | |
317 | * ---------------------------------------- | |
318 | * | | |
319 | * | | |
320 | * V | |
321 | * ---------------------------------------- | |
322 | * | Indirect Block | | |
323 | * | 1 1 1 1 1 5| | |
324 | * | 6 6 6 6 6 1| | |
325 | * |0 3 4 5 6 7 2| | |
326 | * ---------------------------------------- | |
327 | * | | |
328 | * | | |
329 | * V | |
330 | * ---------------------------------------- | |
331 | * | Data block containing offset | | |
332 | * | 101342453 | | |
333 | * | | | |
334 | * | | | |
335 | * ---------------------------------------- | |
336 | * | |
337 | */ | |
338 | ||
cd915493 | 339 | static void find_metapath(struct gfs2_inode *ip, u64 block, |
568f4c96 | 340 | struct metapath *mp) |
b3b94faa | 341 | { |
feaa7bba | 342 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
cd915493 | 343 | u64 b = block; |
b3b94faa DT |
344 | unsigned int i; |
345 | ||
346 | for (i = ip->i_di.di_height; i--;) | |
c2668711 | 347 | mp->mp_list[i] = do_div(b, sdp->sd_inptrs); |
b3b94faa DT |
348 | |
349 | } | |
350 | ||
351 | /** | |
352 | * metapointer - Return pointer to start of metadata in a buffer | |
353 | * @bh: The buffer | |
354 | * @height: The metadata height (0 = dinode) | |
355 | * @mp: The metapath | |
356 | * | |
357 | * Return a pointer to the block number of the next height of the metadata | |
358 | * tree given a buffer containing the pointer to the current height of the | |
359 | * metadata tree. | |
360 | */ | |
361 | ||
fd88de56 SW |
362 | static inline u64 *metapointer(struct buffer_head *bh, int *boundary, |
363 | unsigned int height, const struct metapath *mp) | |
b3b94faa DT |
364 | { |
365 | unsigned int head_size = (height > 0) ? | |
366 | sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode); | |
fd88de56 SW |
367 | u64 *ptr; |
368 | *boundary = 0; | |
369 | ptr = ((u64 *)(bh->b_data + head_size)) + mp->mp_list[height]; | |
75d3b817 | 370 | if (ptr + 1 == (u64 *)(bh->b_data + bh->b_size)) |
fd88de56 SW |
371 | *boundary = 1; |
372 | return ptr; | |
b3b94faa DT |
373 | } |
374 | ||
375 | /** | |
376 | * lookup_block - Get the next metadata block in metadata tree | |
377 | * @ip: The GFS2 inode | |
378 | * @bh: Buffer containing the pointers to metadata blocks | |
379 | * @height: The height of the tree (0 = dinode) | |
380 | * @mp: The metapath | |
381 | * @create: Non-zero if we may create a new meatdata block | |
382 | * @new: Used to indicate if we did create a new metadata block | |
383 | * @block: the returned disk block number | |
384 | * | |
385 | * Given a metatree, complete to a particular height, checks to see if the next | |
386 | * height of the tree exists. If not the next height of the tree is created. | |
387 | * The block number of the next height of the metadata tree is returned. | |
388 | * | |
389 | */ | |
390 | ||
fd88de56 SW |
391 | static int lookup_block(struct gfs2_inode *ip, struct buffer_head *bh, |
392 | unsigned int height, struct metapath *mp, int create, | |
cd915493 | 393 | int *new, u64 *block) |
b3b94faa | 394 | { |
fd88de56 | 395 | int boundary; |
cd915493 | 396 | u64 *ptr = metapointer(bh, &boundary, height, mp); |
b3b94faa DT |
397 | |
398 | if (*ptr) { | |
399 | *block = be64_to_cpu(*ptr); | |
fd88de56 | 400 | return boundary; |
b3b94faa DT |
401 | } |
402 | ||
403 | *block = 0; | |
404 | ||
405 | if (!create) | |
fd88de56 | 406 | return 0; |
b3b94faa | 407 | |
fd88de56 | 408 | if (height == ip->i_di.di_height - 1 && !gfs2_is_dir(ip)) |
b3b94faa DT |
409 | *block = gfs2_alloc_data(ip); |
410 | else | |
411 | *block = gfs2_alloc_meta(ip); | |
412 | ||
d4e9c4c3 | 413 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
414 | |
415 | *ptr = cpu_to_be64(*block); | |
416 | ip->i_di.di_blocks++; | |
417 | ||
418 | *new = 1; | |
fd88de56 | 419 | return 0; |
b3b94faa DT |
420 | } |
421 | ||
422 | /** | |
fd88de56 SW |
423 | * gfs2_block_pointers - Map a block from an inode to a disk block |
424 | * @inode: The inode | |
b3b94faa DT |
425 | * @lblock: The logical block number |
426 | * @new: Value/Result argument (1 = may create/did create new blocks) | |
fd88de56 SW |
427 | * @boundary: gets set if we've hit a block boundary |
428 | * @mp: metapath to use | |
b3b94faa DT |
429 | * |
430 | * Find the block number on the current device which corresponds to an | |
431 | * inode's block. If the block had to be created, "new" will be set. | |
432 | * | |
433 | * Returns: errno | |
434 | */ | |
435 | ||
fd88de56 SW |
436 | static struct buffer_head *gfs2_block_pointers(struct inode *inode, u64 lblock, |
437 | int *new, u64 *dblock, | |
438 | int *boundary, | |
439 | struct metapath *mp) | |
b3b94faa | 440 | { |
feaa7bba SW |
441 | struct gfs2_inode *ip = GFS2_I(inode); |
442 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
b3b94faa | 443 | struct buffer_head *bh; |
b3b94faa DT |
444 | int create = *new; |
445 | unsigned int bsize; | |
446 | unsigned int height; | |
447 | unsigned int end_of_metadata; | |
448 | unsigned int x; | |
449 | int error = 0; | |
450 | ||
451 | *new = 0; | |
452 | *dblock = 0; | |
b3b94faa DT |
453 | |
454 | if (gfs2_assert_warn(sdp, !gfs2_is_stuffed(ip))) | |
455 | goto out; | |
456 | ||
75d3b817 | 457 | bsize = gfs2_is_dir(ip) ? sdp->sd_jbsize : sdp->sd_sb.sb_bsize; |
b3b94faa DT |
458 | |
459 | height = calc_tree_height(ip, (lblock + 1) * bsize); | |
460 | if (ip->i_di.di_height < height) { | |
461 | if (!create) | |
462 | goto out; | |
463 | ||
e90c01e1 | 464 | error = build_height(inode, height); |
b3b94faa DT |
465 | if (error) |
466 | goto out; | |
467 | } | |
468 | ||
fd88de56 | 469 | find_metapath(ip, lblock, mp); |
b3b94faa DT |
470 | end_of_metadata = ip->i_di.di_height - 1; |
471 | ||
472 | error = gfs2_meta_inode_buffer(ip, &bh); | |
473 | if (error) | |
474 | goto out; | |
475 | ||
476 | for (x = 0; x < end_of_metadata; x++) { | |
fd88de56 | 477 | lookup_block(ip, bh, x, mp, create, new, dblock); |
b3b94faa DT |
478 | brelse(bh); |
479 | if (!*dblock) | |
480 | goto out; | |
481 | ||
482 | error = gfs2_meta_indirect_buffer(ip, x+1, *dblock, *new, &bh); | |
483 | if (error) | |
484 | goto out; | |
485 | } | |
486 | ||
fd88de56 | 487 | *boundary = lookup_block(ip, bh, end_of_metadata, mp, create, new, dblock); |
b3b94faa | 488 | if (*new) { |
fd88de56 SW |
489 | struct buffer_head *dibh; |
490 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
b3b94faa | 491 | if (!error) { |
fd88de56 SW |
492 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
493 | gfs2_dinode_out(&ip->i_di, dibh->b_data); | |
494 | brelse(dibh); | |
b3b94faa DT |
495 | } |
496 | } | |
fd88de56 SW |
497 | return bh; |
498 | out: | |
499 | return ERR_PTR(error); | |
500 | } | |
b3b94faa | 501 | |
fd88de56 SW |
502 | |
503 | static inline void bmap_lock(struct inode *inode, int create) | |
504 | { | |
feaa7bba | 505 | struct gfs2_inode *ip = GFS2_I(inode); |
fd88de56 SW |
506 | if (create) |
507 | down_write(&ip->i_rw_mutex); | |
508 | else | |
509 | down_read(&ip->i_rw_mutex); | |
510 | } | |
511 | ||
512 | static inline void bmap_unlock(struct inode *inode, int create) | |
513 | { | |
feaa7bba | 514 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
515 | if (create) |
516 | up_write(&ip->i_rw_mutex); | |
517 | else | |
518 | up_read(&ip->i_rw_mutex); | |
fd88de56 | 519 | } |
b3b94faa | 520 | |
fd88de56 SW |
521 | int gfs2_block_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, int *boundary) |
522 | { | |
523 | struct metapath mp; | |
524 | struct buffer_head *bh; | |
525 | int create = *new; | |
526 | ||
527 | bmap_lock(inode, create); | |
528 | bh = gfs2_block_pointers(inode, lblock, new, dblock, boundary, &mp); | |
529 | bmap_unlock(inode, create); | |
530 | if (!bh) | |
531 | return 0; | |
532 | if (IS_ERR(bh)) | |
533 | return PTR_ERR(bh); | |
534 | brelse(bh); | |
535 | return 0; | |
536 | } | |
537 | ||
538 | int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen) | |
539 | { | |
feaa7bba SW |
540 | struct gfs2_inode *ip = GFS2_I(inode); |
541 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
fd88de56 SW |
542 | struct metapath mp; |
543 | struct buffer_head *bh; | |
544 | int boundary; | |
545 | int create = *new; | |
546 | ||
547 | BUG_ON(!extlen); | |
548 | BUG_ON(!dblock); | |
549 | BUG_ON(!new); | |
550 | ||
551 | bmap_lock(inode, create); | |
552 | bh = gfs2_block_pointers(inode, lblock, new, dblock, &boundary, &mp); | |
553 | *extlen = 1; | |
554 | ||
75d3b817 | 555 | if (bh != NULL && !IS_ERR(bh) && *dblock != 0 && *new == 0) { |
fd88de56 SW |
556 | u64 tmp_dblock; |
557 | int tmp_new; | |
558 | unsigned int nptrs; | |
559 | unsigned end_of_metadata = ip->i_di.di_height - 1; | |
560 | ||
561 | nptrs = (end_of_metadata) ? sdp->sd_inptrs : sdp->sd_diptrs; | |
562 | while (++mp.mp_list[end_of_metadata] < nptrs) { | |
563 | lookup_block(ip, bh, end_of_metadata, &mp, 0, &tmp_new, &tmp_dblock); | |
564 | if (*dblock + *extlen != tmp_dblock) | |
565 | break; | |
75d3b817 | 566 | ++*extlen; |
fd88de56 SW |
567 | } |
568 | } | |
569 | bmap_unlock(inode, create); | |
570 | if (!bh) | |
571 | return 0; | |
572 | if (IS_ERR(bh)) | |
573 | return PTR_ERR(bh); | |
574 | brelse(bh); | |
575 | return 0; | |
b3b94faa DT |
576 | } |
577 | ||
578 | /** | |
579 | * recursive_scan - recursively scan through the end of a file | |
580 | * @ip: the inode | |
581 | * @dibh: the dinode buffer | |
582 | * @mp: the path through the metadata to the point to start | |
583 | * @height: the height the recursion is at | |
584 | * @block: the indirect block to look at | |
585 | * @first: 1 if this is the first block | |
586 | * @bc: the call to make for each piece of metadata | |
587 | * @data: data opaque to this function to pass to @bc | |
588 | * | |
589 | * When this is first called @height and @block should be zero and | |
590 | * @first should be 1. | |
591 | * | |
592 | * Returns: errno | |
593 | */ | |
594 | ||
595 | static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh, | |
596 | struct metapath *mp, unsigned int height, | |
cd915493 | 597 | u64 block, int first, block_call_t bc, |
b3b94faa DT |
598 | void *data) |
599 | { | |
feaa7bba | 600 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa | 601 | struct buffer_head *bh = NULL; |
cd915493 SW |
602 | u64 *top, *bottom; |
603 | u64 bn; | |
b3b94faa DT |
604 | int error; |
605 | int mh_size = sizeof(struct gfs2_meta_header); | |
606 | ||
607 | if (!height) { | |
608 | error = gfs2_meta_inode_buffer(ip, &bh); | |
609 | if (error) | |
610 | return error; | |
611 | dibh = bh; | |
612 | ||
75d3b817 SW |
613 | top = (u64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + mp->mp_list[0]; |
614 | bottom = (u64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + sdp->sd_diptrs; | |
b3b94faa DT |
615 | } else { |
616 | error = gfs2_meta_indirect_buffer(ip, height, block, 0, &bh); | |
617 | if (error) | |
618 | return error; | |
619 | ||
cd915493 | 620 | top = (u64 *)(bh->b_data + mh_size) + |
b3b94faa DT |
621 | ((first) ? mp->mp_list[height] : 0); |
622 | ||
cd915493 | 623 | bottom = (u64 *)(bh->b_data + mh_size) + sdp->sd_inptrs; |
b3b94faa DT |
624 | } |
625 | ||
626 | error = bc(ip, dibh, bh, top, bottom, height, data); | |
627 | if (error) | |
628 | goto out; | |
629 | ||
630 | if (height < ip->i_di.di_height - 1) | |
631 | for (; top < bottom; top++, first = 0) { | |
632 | if (!*top) | |
633 | continue; | |
634 | ||
635 | bn = be64_to_cpu(*top); | |
636 | ||
637 | error = recursive_scan(ip, dibh, mp, height + 1, bn, | |
638 | first, bc, data); | |
639 | if (error) | |
640 | break; | |
641 | } | |
642 | ||
a91ea69f | 643 | out: |
b3b94faa | 644 | brelse(bh); |
b3b94faa DT |
645 | return error; |
646 | } | |
647 | ||
648 | /** | |
649 | * do_strip - Look for a layer a particular layer of the file and strip it off | |
650 | * @ip: the inode | |
651 | * @dibh: the dinode buffer | |
652 | * @bh: A buffer of pointers | |
653 | * @top: The first pointer in the buffer | |
654 | * @bottom: One more than the last pointer | |
655 | * @height: the height this buffer is at | |
656 | * @data: a pointer to a struct strip_mine | |
657 | * | |
658 | * Returns: errno | |
659 | */ | |
660 | ||
661 | static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh, | |
cd915493 | 662 | struct buffer_head *bh, u64 *top, u64 *bottom, |
b3b94faa DT |
663 | unsigned int height, void *data) |
664 | { | |
feaa7bba SW |
665 | struct strip_mine *sm = data; |
666 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); | |
b3b94faa | 667 | struct gfs2_rgrp_list rlist; |
cd915493 SW |
668 | u64 bn, bstart; |
669 | u32 blen; | |
670 | u64 *p; | |
b3b94faa DT |
671 | unsigned int rg_blocks = 0; |
672 | int metadata; | |
673 | unsigned int revokes = 0; | |
674 | int x; | |
675 | int error; | |
676 | ||
677 | if (!*top) | |
678 | sm->sm_first = 0; | |
679 | ||
680 | if (height != sm->sm_height) | |
681 | return 0; | |
682 | ||
683 | if (sm->sm_first) { | |
684 | top++; | |
685 | sm->sm_first = 0; | |
686 | } | |
687 | ||
18ec7d5c | 688 | metadata = (height != ip->i_di.di_height - 1); |
b3b94faa DT |
689 | if (metadata) |
690 | revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs; | |
691 | ||
692 | error = gfs2_rindex_hold(sdp, &ip->i_alloc.al_ri_gh); | |
693 | if (error) | |
694 | return error; | |
695 | ||
696 | memset(&rlist, 0, sizeof(struct gfs2_rgrp_list)); | |
697 | bstart = 0; | |
698 | blen = 0; | |
699 | ||
700 | for (p = top; p < bottom; p++) { | |
701 | if (!*p) | |
702 | continue; | |
703 | ||
704 | bn = be64_to_cpu(*p); | |
705 | ||
706 | if (bstart + blen == bn) | |
707 | blen++; | |
708 | else { | |
709 | if (bstart) | |
710 | gfs2_rlist_add(sdp, &rlist, bstart); | |
711 | ||
712 | bstart = bn; | |
713 | blen = 1; | |
714 | } | |
715 | } | |
716 | ||
717 | if (bstart) | |
718 | gfs2_rlist_add(sdp, &rlist, bstart); | |
719 | else | |
720 | goto out; /* Nothing to do */ | |
721 | ||
722 | gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, 0); | |
723 | ||
724 | for (x = 0; x < rlist.rl_rgrps; x++) { | |
725 | struct gfs2_rgrpd *rgd; | |
5c676f6d | 726 | rgd = rlist.rl_ghs[x].gh_gl->gl_object; |
b3b94faa DT |
727 | rg_blocks += rgd->rd_ri.ri_length; |
728 | } | |
729 | ||
730 | error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs); | |
731 | if (error) | |
732 | goto out_rlist; | |
733 | ||
734 | error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + | |
735 | RES_INDIRECT + RES_STATFS + RES_QUOTA, | |
736 | revokes); | |
737 | if (error) | |
738 | goto out_rg_gunlock; | |
739 | ||
740 | down_write(&ip->i_rw_mutex); | |
741 | ||
d4e9c4c3 SW |
742 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
743 | gfs2_trans_add_bh(ip->i_gl, bh, 1); | |
b3b94faa DT |
744 | |
745 | bstart = 0; | |
746 | blen = 0; | |
747 | ||
748 | for (p = top; p < bottom; p++) { | |
749 | if (!*p) | |
750 | continue; | |
751 | ||
752 | bn = be64_to_cpu(*p); | |
753 | ||
754 | if (bstart + blen == bn) | |
755 | blen++; | |
756 | else { | |
757 | if (bstart) { | |
758 | if (metadata) | |
759 | gfs2_free_meta(ip, bstart, blen); | |
760 | else | |
761 | gfs2_free_data(ip, bstart, blen); | |
762 | } | |
763 | ||
764 | bstart = bn; | |
765 | blen = 1; | |
766 | } | |
767 | ||
768 | *p = 0; | |
769 | if (!ip->i_di.di_blocks) | |
770 | gfs2_consist_inode(ip); | |
771 | ip->i_di.di_blocks--; | |
772 | } | |
773 | if (bstart) { | |
774 | if (metadata) | |
775 | gfs2_free_meta(ip, bstart, blen); | |
776 | else | |
777 | gfs2_free_data(ip, bstart, blen); | |
778 | } | |
779 | ||
780 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); | |
781 | ||
782 | gfs2_dinode_out(&ip->i_di, dibh->b_data); | |
783 | ||
784 | up_write(&ip->i_rw_mutex); | |
785 | ||
786 | gfs2_trans_end(sdp); | |
787 | ||
a91ea69f | 788 | out_rg_gunlock: |
b3b94faa | 789 | gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs); |
a91ea69f | 790 | out_rlist: |
b3b94faa | 791 | gfs2_rlist_free(&rlist); |
a91ea69f | 792 | out: |
b3b94faa | 793 | gfs2_glock_dq_uninit(&ip->i_alloc.al_ri_gh); |
b3b94faa DT |
794 | return error; |
795 | } | |
796 | ||
797 | /** | |
798 | * do_grow - Make a file look bigger than it is | |
799 | * @ip: the inode | |
800 | * @size: the size to set the file to | |
801 | * | |
802 | * Called with an exclusive lock on @ip. | |
803 | * | |
804 | * Returns: errno | |
805 | */ | |
806 | ||
cd915493 | 807 | static int do_grow(struct gfs2_inode *ip, u64 size) |
b3b94faa | 808 | { |
feaa7bba | 809 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
810 | struct gfs2_alloc *al; |
811 | struct buffer_head *dibh; | |
812 | unsigned int h; | |
813 | int error; | |
814 | ||
815 | al = gfs2_alloc_get(ip); | |
816 | ||
817 | error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
818 | if (error) | |
819 | goto out; | |
820 | ||
821 | error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid); | |
822 | if (error) | |
823 | goto out_gunlock_q; | |
824 | ||
825 | al->al_requested = sdp->sd_max_height + RES_DATA; | |
826 | ||
827 | error = gfs2_inplace_reserve(ip); | |
828 | if (error) | |
829 | goto out_gunlock_q; | |
830 | ||
831 | error = gfs2_trans_begin(sdp, | |
832 | sdp->sd_max_height + al->al_rgd->rd_ri.ri_length + | |
833 | RES_JDATA + RES_DINODE + RES_STATFS + RES_QUOTA, 0); | |
834 | if (error) | |
835 | goto out_ipres; | |
836 | ||
837 | if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { | |
838 | if (gfs2_is_stuffed(ip)) { | |
f25ef0c1 | 839 | error = gfs2_unstuff_dinode(ip, NULL); |
b3b94faa DT |
840 | if (error) |
841 | goto out_end_trans; | |
842 | } | |
843 | ||
844 | h = calc_tree_height(ip, size); | |
845 | if (ip->i_di.di_height < h) { | |
846 | down_write(&ip->i_rw_mutex); | |
feaa7bba | 847 | error = build_height(&ip->i_inode, h); |
b3b94faa DT |
848 | up_write(&ip->i_rw_mutex); |
849 | if (error) | |
850 | goto out_end_trans; | |
851 | } | |
852 | } | |
853 | ||
854 | ip->i_di.di_size = size; | |
855 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); | |
856 | ||
857 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
858 | if (error) | |
859 | goto out_end_trans; | |
860 | ||
d4e9c4c3 | 861 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
862 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
863 | brelse(dibh); | |
864 | ||
a91ea69f | 865 | out_end_trans: |
b3b94faa | 866 | gfs2_trans_end(sdp); |
a91ea69f | 867 | out_ipres: |
b3b94faa | 868 | gfs2_inplace_release(ip); |
a91ea69f | 869 | out_gunlock_q: |
b3b94faa | 870 | gfs2_quota_unlock(ip); |
a91ea69f | 871 | out: |
b3b94faa | 872 | gfs2_alloc_put(ip); |
b3b94faa DT |
873 | return error; |
874 | } | |
875 | ||
ba7f7290 SW |
876 | |
877 | /** | |
878 | * gfs2_block_truncate_page - Deal with zeroing out data for truncate | |
879 | * | |
880 | * This is partly borrowed from ext3. | |
881 | */ | |
882 | static int gfs2_block_truncate_page(struct address_space *mapping) | |
883 | { | |
884 | struct inode *inode = mapping->host; | |
885 | struct gfs2_inode *ip = GFS2_I(inode); | |
886 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
887 | loff_t from = inode->i_size; | |
888 | unsigned long index = from >> PAGE_CACHE_SHIFT; | |
889 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
890 | unsigned blocksize, iblock, length, pos; | |
891 | struct buffer_head *bh; | |
892 | struct page *page; | |
893 | void *kaddr; | |
894 | int err; | |
895 | ||
896 | page = grab_cache_page(mapping, index); | |
897 | if (!page) | |
898 | return 0; | |
899 | ||
900 | blocksize = inode->i_sb->s_blocksize; | |
901 | length = blocksize - (offset & (blocksize - 1)); | |
902 | iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); | |
903 | ||
904 | if (!page_has_buffers(page)) | |
905 | create_empty_buffers(page, blocksize, 0); | |
906 | ||
907 | /* Find the buffer that contains "offset" */ | |
908 | bh = page_buffers(page); | |
909 | pos = blocksize; | |
910 | while (offset >= pos) { | |
911 | bh = bh->b_this_page; | |
912 | iblock++; | |
913 | pos += blocksize; | |
914 | } | |
915 | ||
916 | err = 0; | |
917 | ||
918 | if (!buffer_mapped(bh)) { | |
919 | gfs2_get_block(inode, iblock, bh, 0); | |
920 | /* unmapped? It's a hole - nothing to do */ | |
921 | if (!buffer_mapped(bh)) | |
922 | goto unlock; | |
923 | } | |
924 | ||
925 | /* Ok, it's mapped. Make sure it's up-to-date */ | |
926 | if (PageUptodate(page)) | |
927 | set_buffer_uptodate(bh); | |
928 | ||
929 | if (!buffer_uptodate(bh)) { | |
930 | err = -EIO; | |
931 | ll_rw_block(READ, 1, &bh); | |
932 | wait_on_buffer(bh); | |
933 | /* Uhhuh. Read error. Complain and punt. */ | |
934 | if (!buffer_uptodate(bh)) | |
935 | goto unlock; | |
936 | } | |
937 | ||
938 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) | |
939 | gfs2_trans_add_bh(ip->i_gl, bh, 0); | |
940 | ||
941 | kaddr = kmap_atomic(page, KM_USER0); | |
942 | memset(kaddr + offset, 0, length); | |
943 | flush_dcache_page(page); | |
944 | kunmap_atomic(kaddr, KM_USER0); | |
945 | ||
946 | unlock: | |
947 | unlock_page(page); | |
948 | page_cache_release(page); | |
949 | return err; | |
950 | } | |
951 | ||
cd915493 | 952 | static int trunc_start(struct gfs2_inode *ip, u64 size) |
b3b94faa | 953 | { |
feaa7bba | 954 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
955 | struct buffer_head *dibh; |
956 | int journaled = gfs2_is_jdata(ip); | |
957 | int error; | |
958 | ||
959 | error = gfs2_trans_begin(sdp, | |
960 | RES_DINODE + ((journaled) ? RES_JDATA : 0), 0); | |
961 | if (error) | |
962 | return error; | |
963 | ||
964 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
965 | if (error) | |
966 | goto out; | |
967 | ||
968 | if (gfs2_is_stuffed(ip)) { | |
969 | ip->i_di.di_size = size; | |
970 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); | |
d4e9c4c3 | 971 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
972 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
973 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + size); | |
974 | error = 1; | |
975 | ||
976 | } else { | |
cd915493 | 977 | if (size & (u64)(sdp->sd_sb.sb_bsize - 1)) |
feaa7bba | 978 | error = gfs2_block_truncate_page(ip->i_inode.i_mapping); |
b3b94faa DT |
979 | |
980 | if (!error) { | |
981 | ip->i_di.di_size = size; | |
982 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); | |
983 | ip->i_di.di_flags |= GFS2_DIF_TRUNC_IN_PROG; | |
d4e9c4c3 | 984 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
985 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
986 | } | |
987 | } | |
988 | ||
989 | brelse(dibh); | |
990 | ||
a91ea69f | 991 | out: |
b3b94faa | 992 | gfs2_trans_end(sdp); |
b3b94faa DT |
993 | return error; |
994 | } | |
995 | ||
cd915493 | 996 | static int trunc_dealloc(struct gfs2_inode *ip, u64 size) |
b3b94faa DT |
997 | { |
998 | unsigned int height = ip->i_di.di_height; | |
cd915493 | 999 | u64 lblock; |
b3b94faa DT |
1000 | struct metapath mp; |
1001 | int error; | |
1002 | ||
1003 | if (!size) | |
1004 | lblock = 0; | |
18ec7d5c | 1005 | else |
feaa7bba | 1006 | lblock = (size - 1) >> GFS2_SB(&ip->i_inode)->sd_sb.sb_bsize_shift; |
b3b94faa DT |
1007 | |
1008 | find_metapath(ip, lblock, &mp); | |
1009 | gfs2_alloc_get(ip); | |
1010 | ||
1011 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
1012 | if (error) | |
1013 | goto out; | |
1014 | ||
1015 | while (height--) { | |
1016 | struct strip_mine sm; | |
1017 | sm.sm_first = !!size; | |
1018 | sm.sm_height = height; | |
1019 | ||
1020 | error = recursive_scan(ip, NULL, &mp, 0, 0, 1, do_strip, &sm); | |
1021 | if (error) | |
1022 | break; | |
1023 | } | |
1024 | ||
1025 | gfs2_quota_unhold(ip); | |
1026 | ||
a91ea69f | 1027 | out: |
b3b94faa DT |
1028 | gfs2_alloc_put(ip); |
1029 | return error; | |
1030 | } | |
1031 | ||
1032 | static int trunc_end(struct gfs2_inode *ip) | |
1033 | { | |
feaa7bba | 1034 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
1035 | struct buffer_head *dibh; |
1036 | int error; | |
1037 | ||
1038 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1039 | if (error) | |
1040 | return error; | |
1041 | ||
1042 | down_write(&ip->i_rw_mutex); | |
1043 | ||
1044 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1045 | if (error) | |
1046 | goto out; | |
1047 | ||
1048 | if (!ip->i_di.di_size) { | |
1049 | ip->i_di.di_height = 0; | |
1050 | ip->i_di.di_goal_meta = | |
1051 | ip->i_di.di_goal_data = | |
1052 | ip->i_num.no_addr; | |
1053 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
1054 | } | |
1055 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); | |
1056 | ip->i_di.di_flags &= ~GFS2_DIF_TRUNC_IN_PROG; | |
1057 | ||
d4e9c4c3 | 1058 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
1059 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
1060 | brelse(dibh); | |
1061 | ||
a91ea69f | 1062 | out: |
b3b94faa | 1063 | up_write(&ip->i_rw_mutex); |
b3b94faa | 1064 | gfs2_trans_end(sdp); |
b3b94faa DT |
1065 | return error; |
1066 | } | |
1067 | ||
1068 | /** | |
1069 | * do_shrink - make a file smaller | |
1070 | * @ip: the inode | |
1071 | * @size: the size to make the file | |
1072 | * @truncator: function to truncate the last partial block | |
1073 | * | |
1074 | * Called with an exclusive lock on @ip. | |
1075 | * | |
1076 | * Returns: errno | |
1077 | */ | |
1078 | ||
cd915493 | 1079 | static int do_shrink(struct gfs2_inode *ip, u64 size) |
b3b94faa DT |
1080 | { |
1081 | int error; | |
1082 | ||
aa6a85a9 | 1083 | error = trunc_start(ip, size); |
b3b94faa DT |
1084 | if (error < 0) |
1085 | return error; | |
1086 | if (error > 0) | |
1087 | return 0; | |
1088 | ||
1089 | error = trunc_dealloc(ip, size); | |
1090 | if (!error) | |
1091 | error = trunc_end(ip); | |
1092 | ||
1093 | return error; | |
1094 | } | |
1095 | ||
1096 | /** | |
666a2c53 | 1097 | * gfs2_truncatei - make a file a given size |
b3b94faa DT |
1098 | * @ip: the inode |
1099 | * @size: the size to make the file | |
1100 | * @truncator: function to truncate the last partial block | |
1101 | * | |
1102 | * The file size can grow, shrink, or stay the same size. | |
1103 | * | |
1104 | * Returns: errno | |
1105 | */ | |
1106 | ||
cd915493 | 1107 | int gfs2_truncatei(struct gfs2_inode *ip, u64 size) |
b3b94faa DT |
1108 | { |
1109 | int error; | |
1110 | ||
feaa7bba | 1111 | if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), S_ISREG(ip->i_di.di_mode))) |
b3b94faa DT |
1112 | return -EINVAL; |
1113 | ||
1114 | if (size > ip->i_di.di_size) | |
1115 | error = do_grow(ip, size); | |
1116 | else | |
aa6a85a9 | 1117 | error = do_shrink(ip, size); |
b3b94faa DT |
1118 | |
1119 | return error; | |
1120 | } | |
1121 | ||
1122 | int gfs2_truncatei_resume(struct gfs2_inode *ip) | |
1123 | { | |
1124 | int error; | |
1125 | error = trunc_dealloc(ip, ip->i_di.di_size); | |
1126 | if (!error) | |
1127 | error = trunc_end(ip); | |
1128 | return error; | |
1129 | } | |
1130 | ||
1131 | int gfs2_file_dealloc(struct gfs2_inode *ip) | |
1132 | { | |
1133 | return trunc_dealloc(ip, 0); | |
1134 | } | |
1135 | ||
1136 | /** | |
1137 | * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file | |
1138 | * @ip: the file | |
1139 | * @len: the number of bytes to be written to the file | |
1140 | * @data_blocks: returns the number of data blocks required | |
1141 | * @ind_blocks: returns the number of indirect blocks required | |
1142 | * | |
1143 | */ | |
1144 | ||
1145 | void gfs2_write_calc_reserv(struct gfs2_inode *ip, unsigned int len, | |
1146 | unsigned int *data_blocks, unsigned int *ind_blocks) | |
1147 | { | |
feaa7bba | 1148 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
1149 | unsigned int tmp; |
1150 | ||
18ec7d5c | 1151 | if (gfs2_is_dir(ip)) { |
5c676f6d | 1152 | *data_blocks = DIV_ROUND_UP(len, sdp->sd_jbsize) + 2; |
b3b94faa DT |
1153 | *ind_blocks = 3 * (sdp->sd_max_jheight - 1); |
1154 | } else { | |
1155 | *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3; | |
1156 | *ind_blocks = 3 * (sdp->sd_max_height - 1); | |
1157 | } | |
1158 | ||
1159 | for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) { | |
5c676f6d | 1160 | tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); |
b3b94faa DT |
1161 | *ind_blocks += tmp; |
1162 | } | |
1163 | } | |
1164 | ||
1165 | /** | |
1166 | * gfs2_write_alloc_required - figure out if a write will require an allocation | |
1167 | * @ip: the file being written to | |
1168 | * @offset: the offset to write to | |
1169 | * @len: the number of bytes being written | |
1170 | * @alloc_required: set to 1 if an alloc is required, 0 otherwise | |
1171 | * | |
1172 | * Returns: errno | |
1173 | */ | |
1174 | ||
cd915493 | 1175 | int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset, |
b3b94faa DT |
1176 | unsigned int len, int *alloc_required) |
1177 | { | |
feaa7bba | 1178 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
cd915493 SW |
1179 | u64 lblock, lblock_stop, dblock; |
1180 | u32 extlen; | |
b3b94faa DT |
1181 | int new = 0; |
1182 | int error = 0; | |
1183 | ||
1184 | *alloc_required = 0; | |
1185 | ||
1186 | if (!len) | |
1187 | return 0; | |
1188 | ||
1189 | if (gfs2_is_stuffed(ip)) { | |
1190 | if (offset + len > | |
1191 | sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) | |
1192 | *alloc_required = 1; | |
1193 | return 0; | |
1194 | } | |
1195 | ||
18ec7d5c | 1196 | if (gfs2_is_dir(ip)) { |
b3b94faa DT |
1197 | unsigned int bsize = sdp->sd_jbsize; |
1198 | lblock = offset; | |
1199 | do_div(lblock, bsize); | |
1200 | lblock_stop = offset + len + bsize - 1; | |
1201 | do_div(lblock_stop, bsize); | |
1202 | } else { | |
1203 | unsigned int shift = sdp->sd_sb.sb_bsize_shift; | |
1204 | lblock = offset >> shift; | |
1205 | lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift; | |
1206 | } | |
1207 | ||
1208 | for (; lblock < lblock_stop; lblock += extlen) { | |
feaa7bba | 1209 | error = gfs2_extent_map(&ip->i_inode, lblock, &new, &dblock, &extlen); |
b3b94faa DT |
1210 | if (error) |
1211 | return error; | |
1212 | ||
1213 | if (!dblock) { | |
1214 | *alloc_required = 1; | |
1215 | return 0; | |
1216 | } | |
1217 | } | |
1218 | ||
1219 | return 0; | |
1220 | } | |
1221 |