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Commit | Line | Data |
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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> |
7d308590 | 17 | #include <linux/lm_interface.h> |
b3b94faa DT |
18 | |
19 | #include "gfs2.h" | |
5c676f6d | 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; | |
48516ced | 124 | struct gfs2_dinode *di; |
cd915493 | 125 | u64 block = 0; |
18ec7d5c | 126 | int isdir = gfs2_is_dir(ip); |
b3b94faa DT |
127 | int error; |
128 | ||
129 | down_write(&ip->i_rw_mutex); | |
130 | ||
131 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
132 | if (error) | |
133 | goto out; | |
907b9bce | 134 | |
b3b94faa DT |
135 | if (ip->i_di.di_size) { |
136 | /* Get a free block, fill it with the stuffed data, | |
137 | and write it out to disk */ | |
138 | ||
18ec7d5c | 139 | if (isdir) { |
b3b94faa DT |
140 | block = gfs2_alloc_meta(ip); |
141 | ||
61e085a8 | 142 | error = gfs2_dir_get_new_buffer(ip, block, &bh); |
b3b94faa DT |
143 | if (error) |
144 | goto out_brelse; | |
48516ced | 145 | gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_meta_header), |
b3b94faa DT |
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); |
48516ced | 160 | di = (struct gfs2_dinode *)dibh->b_data; |
b3b94faa DT |
161 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
162 | ||
163 | if (ip->i_di.di_size) { | |
48516ced | 164 | *(__be64 *)(di + 1) = cpu_to_be64(block); |
b3b94faa | 165 | ip->i_di.di_blocks++; |
48516ced | 166 | di->di_blocks = cpu_to_be64(ip->i_di.di_blocks); |
b3b94faa DT |
167 | } |
168 | ||
169 | ip->i_di.di_height = 1; | |
48516ced | 170 | di->di_height = cpu_to_be16(1); |
b3b94faa | 171 | |
a91ea69f | 172 | out_brelse: |
b3b94faa | 173 | brelse(dibh); |
a91ea69f | 174 | out: |
b3b94faa | 175 | up_write(&ip->i_rw_mutex); |
b3b94faa DT |
176 | return error; |
177 | } | |
178 | ||
179 | /** | |
180 | * calc_tree_height - Calculate the height of a metadata tree | |
181 | * @ip: The GFS2 inode | |
182 | * @size: The proposed size of the file | |
183 | * | |
184 | * Work out how tall a metadata tree needs to be in order to accommodate a | |
185 | * file of a particular size. If size is less than the current size of | |
186 | * the inode, then the current size of the inode is used instead of the | |
187 | * supplied one. | |
188 | * | |
189 | * Returns: the height the tree should be | |
190 | */ | |
191 | ||
cd915493 | 192 | static unsigned int calc_tree_height(struct gfs2_inode *ip, u64 size) |
b3b94faa | 193 | { |
feaa7bba | 194 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
cd915493 | 195 | u64 *arr; |
b3b94faa DT |
196 | unsigned int max, height; |
197 | ||
198 | if (ip->i_di.di_size > size) | |
199 | size = ip->i_di.di_size; | |
200 | ||
18ec7d5c | 201 | if (gfs2_is_dir(ip)) { |
b3b94faa DT |
202 | arr = sdp->sd_jheightsize; |
203 | max = sdp->sd_max_jheight; | |
204 | } else { | |
205 | arr = sdp->sd_heightsize; | |
206 | max = sdp->sd_max_height; | |
207 | } | |
208 | ||
209 | for (height = 0; height < max; height++) | |
210 | if (arr[height] >= size) | |
211 | break; | |
212 | ||
213 | return height; | |
214 | } | |
215 | ||
216 | /** | |
217 | * build_height - Build a metadata tree of the requested height | |
218 | * @ip: The GFS2 inode | |
219 | * @height: The height to build to | |
220 | * | |
b3b94faa DT |
221 | * |
222 | * Returns: errno | |
223 | */ | |
224 | ||
e90c01e1 | 225 | static int build_height(struct inode *inode, unsigned height) |
b3b94faa | 226 | { |
feaa7bba | 227 | struct gfs2_inode *ip = GFS2_I(inode); |
e90c01e1 SW |
228 | unsigned new_height = height - ip->i_di.di_height; |
229 | struct buffer_head *dibh; | |
230 | struct buffer_head *blocks[GFS2_MAX_META_HEIGHT]; | |
48516ced | 231 | struct gfs2_dinode *di; |
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 | } | |
907b9bce | 249 | |
e90c01e1 SW |
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); | |
48516ced | 270 | di = (struct gfs2_dinode *)dibh->b_data; |
e90c01e1 | 271 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
48516ced | 272 | *(__be64 *)(di + 1) = cpu_to_be64(bn); |
e90c01e1 SW |
273 | ip->i_di.di_height += new_height; |
274 | ip->i_di.di_blocks += new_height; | |
48516ced SW |
275 | di->di_height = cpu_to_be16(ip->i_di.di_height); |
276 | di->di_blocks = cpu_to_be64(ip->i_di.di_blocks); | |
e90c01e1 SW |
277 | brelse(dibh); |
278 | return error; | |
b3b94faa DT |
279 | } |
280 | ||
281 | /** | |
282 | * find_metapath - Find path through the metadata tree | |
283 | * @ip: The inode pointer | |
284 | * @mp: The metapath to return the result in | |
285 | * @block: The disk block to look up | |
286 | * | |
287 | * This routine returns a struct metapath structure that defines a path | |
288 | * through the metadata of inode "ip" to get to block "block". | |
289 | * | |
290 | * Example: | |
291 | * Given: "ip" is a height 3 file, "offset" is 101342453, and this is a | |
292 | * filesystem with a blocksize of 4096. | |
293 | * | |
294 | * find_metapath() would return a struct metapath structure set to: | |
295 | * mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48, | |
296 | * and mp_list[2] = 165. | |
297 | * | |
298 | * That means that in order to get to the block containing the byte at | |
299 | * offset 101342453, we would load the indirect block pointed to by pointer | |
300 | * 0 in the dinode. We would then load the indirect block pointed to by | |
301 | * pointer 48 in that indirect block. We would then load the data block | |
302 | * pointed to by pointer 165 in that indirect block. | |
303 | * | |
304 | * ---------------------------------------- | |
305 | * | Dinode | | | |
306 | * | | 4| | |
307 | * | |0 1 2 3 4 5 9| | |
308 | * | | 6| | |
309 | * ---------------------------------------- | |
310 | * | | |
311 | * | | |
312 | * V | |
313 | * ---------------------------------------- | |
314 | * | Indirect Block | | |
315 | * | 5| | |
316 | * | 4 4 4 4 4 5 5 1| | |
317 | * |0 5 6 7 8 9 0 1 2| | |
318 | * ---------------------------------------- | |
319 | * | | |
320 | * | | |
321 | * V | |
322 | * ---------------------------------------- | |
323 | * | Indirect Block | | |
324 | * | 1 1 1 1 1 5| | |
325 | * | 6 6 6 6 6 1| | |
326 | * |0 3 4 5 6 7 2| | |
327 | * ---------------------------------------- | |
328 | * | | |
329 | * | | |
330 | * V | |
331 | * ---------------------------------------- | |
332 | * | Data block containing offset | | |
333 | * | 101342453 | | |
334 | * | | | |
335 | * | | | |
336 | * ---------------------------------------- | |
337 | * | |
338 | */ | |
339 | ||
cd915493 | 340 | static void find_metapath(struct gfs2_inode *ip, u64 block, |
568f4c96 | 341 | struct metapath *mp) |
b3b94faa | 342 | { |
feaa7bba | 343 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
cd915493 | 344 | u64 b = block; |
b3b94faa DT |
345 | unsigned int i; |
346 | ||
347 | for (i = ip->i_di.di_height; i--;) | |
c2668711 | 348 | mp->mp_list[i] = do_div(b, sdp->sd_inptrs); |
b3b94faa DT |
349 | |
350 | } | |
351 | ||
352 | /** | |
353 | * metapointer - Return pointer to start of metadata in a buffer | |
354 | * @bh: The buffer | |
355 | * @height: The metadata height (0 = dinode) | |
356 | * @mp: The metapath | |
357 | * | |
358 | * Return a pointer to the block number of the next height of the metadata | |
359 | * tree given a buffer containing the pointer to the current height of the | |
360 | * metadata tree. | |
361 | */ | |
362 | ||
fd88de56 SW |
363 | static inline u64 *metapointer(struct buffer_head *bh, int *boundary, |
364 | unsigned int height, const struct metapath *mp) | |
b3b94faa DT |
365 | { |
366 | unsigned int head_size = (height > 0) ? | |
367 | sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode); | |
fd88de56 SW |
368 | u64 *ptr; |
369 | *boundary = 0; | |
370 | ptr = ((u64 *)(bh->b_data + head_size)) + mp->mp_list[height]; | |
75d3b817 | 371 | if (ptr + 1 == (u64 *)(bh->b_data + bh->b_size)) |
fd88de56 SW |
372 | *boundary = 1; |
373 | return ptr; | |
b3b94faa DT |
374 | } |
375 | ||
376 | /** | |
377 | * lookup_block - Get the next metadata block in metadata tree | |
378 | * @ip: The GFS2 inode | |
379 | * @bh: Buffer containing the pointers to metadata blocks | |
380 | * @height: The height of the tree (0 = dinode) | |
381 | * @mp: The metapath | |
382 | * @create: Non-zero if we may create a new meatdata block | |
383 | * @new: Used to indicate if we did create a new metadata block | |
384 | * @block: the returned disk block number | |
385 | * | |
386 | * Given a metatree, complete to a particular height, checks to see if the next | |
387 | * height of the tree exists. If not the next height of the tree is created. | |
388 | * The block number of the next height of the metadata tree is returned. | |
389 | * | |
390 | */ | |
391 | ||
fd88de56 SW |
392 | static int lookup_block(struct gfs2_inode *ip, struct buffer_head *bh, |
393 | unsigned int height, struct metapath *mp, int create, | |
cd915493 | 394 | int *new, u64 *block) |
b3b94faa | 395 | { |
fd88de56 | 396 | int boundary; |
cd915493 | 397 | u64 *ptr = metapointer(bh, &boundary, height, mp); |
b3b94faa DT |
398 | |
399 | if (*ptr) { | |
400 | *block = be64_to_cpu(*ptr); | |
fd88de56 | 401 | return boundary; |
b3b94faa DT |
402 | } |
403 | ||
404 | *block = 0; | |
405 | ||
406 | if (!create) | |
fd88de56 | 407 | return 0; |
b3b94faa | 408 | |
fd88de56 | 409 | if (height == ip->i_di.di_height - 1 && !gfs2_is_dir(ip)) |
b3b94faa DT |
410 | *block = gfs2_alloc_data(ip); |
411 | else | |
412 | *block = gfs2_alloc_meta(ip); | |
413 | ||
d4e9c4c3 | 414 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
415 | |
416 | *ptr = cpu_to_be64(*block); | |
417 | ip->i_di.di_blocks++; | |
418 | ||
419 | *new = 1; | |
fd88de56 | 420 | return 0; |
b3b94faa DT |
421 | } |
422 | ||
423 | /** | |
fd88de56 SW |
424 | * gfs2_block_pointers - Map a block from an inode to a disk block |
425 | * @inode: The inode | |
b3b94faa | 426 | * @lblock: The logical block number |
7a6bbacb | 427 | * @map_bh: The bh to be mapped |
fd88de56 | 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 | ||
7a6bbacb | 436 | static int gfs2_block_pointers(struct inode *inode, u64 lblock, int create, |
23591256 | 437 | struct buffer_head *bh_map, struct metapath *mp) |
b3b94faa | 438 | { |
feaa7bba SW |
439 | struct gfs2_inode *ip = GFS2_I(inode); |
440 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
b3b94faa | 441 | struct buffer_head *bh; |
b3b94faa DT |
442 | unsigned int bsize; |
443 | unsigned int height; | |
444 | unsigned int end_of_metadata; | |
445 | unsigned int x; | |
446 | int error = 0; | |
7a6bbacb SW |
447 | int new = 0; |
448 | u64 dblock = 0; | |
449 | int boundary; | |
23591256 | 450 | unsigned int maxlen = bh_map->b_size >> inode->i_blkbits; |
b3b94faa | 451 | |
7276b3b0 SW |
452 | BUG_ON(maxlen == 0); |
453 | ||
b3b94faa | 454 | if (gfs2_assert_warn(sdp, !gfs2_is_stuffed(ip))) |
7a6bbacb | 455 | return 0; |
b3b94faa | 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) | |
7a6bbacb | 462 | return 0; |
b3b94faa | 463 | |
e90c01e1 | 464 | error = build_height(inode, height); |
b3b94faa | 465 | if (error) |
7a6bbacb | 466 | return error; |
b3b94faa DT |
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) | |
7a6bbacb | 474 | return error; |
b3b94faa DT |
475 | |
476 | for (x = 0; x < end_of_metadata; x++) { | |
7a6bbacb | 477 | lookup_block(ip, bh, x, mp, create, &new, &dblock); |
b3b94faa | 478 | brelse(bh); |
7a6bbacb SW |
479 | if (!dblock) |
480 | return 0; | |
b3b94faa | 481 | |
7a6bbacb | 482 | error = gfs2_meta_indirect_buffer(ip, x+1, dblock, new, &bh); |
b3b94faa | 483 | if (error) |
7a6bbacb | 484 | return error; |
b3b94faa DT |
485 | } |
486 | ||
7a6bbacb SW |
487 | boundary = lookup_block(ip, bh, end_of_metadata, mp, create, &new, &dblock); |
488 | clear_buffer_mapped(bh_map); | |
489 | clear_buffer_new(bh_map); | |
490 | clear_buffer_boundary(bh_map); | |
491 | ||
492 | if (dblock) { | |
493 | map_bh(bh_map, inode->i_sb, dblock); | |
494 | if (boundary) | |
495 | set_buffer_boundary(bh); | |
496 | if (new) { | |
497 | struct buffer_head *dibh; | |
498 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
499 | if (!error) { | |
500 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
501 | gfs2_dinode_out(&ip->i_di, dibh->b_data); | |
502 | brelse(dibh); | |
503 | } | |
504 | set_buffer_new(bh_map); | |
505 | goto out_brelse; | |
506 | } | |
507 | while(--maxlen && !buffer_boundary(bh_map)) { | |
508 | u64 eblock; | |
509 | ||
510 | mp->mp_list[end_of_metadata]++; | |
511 | boundary = lookup_block(ip, bh, end_of_metadata, mp, 0, &new, &eblock); | |
512 | if (eblock != ++dblock) | |
513 | break; | |
f3b30912 | 514 | bh_map->b_size += (1 << inode->i_blkbits); |
7a6bbacb SW |
515 | if (boundary) |
516 | set_buffer_boundary(bh_map); | |
b3b94faa DT |
517 | } |
518 | } | |
7a6bbacb SW |
519 | out_brelse: |
520 | brelse(bh); | |
521 | return 0; | |
fd88de56 | 522 | } |
b3b94faa | 523 | |
fd88de56 SW |
524 | |
525 | static inline void bmap_lock(struct inode *inode, int create) | |
526 | { | |
feaa7bba | 527 | struct gfs2_inode *ip = GFS2_I(inode); |
fd88de56 SW |
528 | if (create) |
529 | down_write(&ip->i_rw_mutex); | |
530 | else | |
531 | down_read(&ip->i_rw_mutex); | |
532 | } | |
533 | ||
534 | static inline void bmap_unlock(struct inode *inode, int create) | |
535 | { | |
feaa7bba | 536 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
537 | if (create) |
538 | up_write(&ip->i_rw_mutex); | |
539 | else | |
540 | up_read(&ip->i_rw_mutex); | |
fd88de56 | 541 | } |
b3b94faa | 542 | |
7a6bbacb | 543 | int gfs2_block_map(struct inode *inode, u64 lblock, int create, |
23591256 | 544 | struct buffer_head *bh) |
fd88de56 SW |
545 | { |
546 | struct metapath mp; | |
7a6bbacb | 547 | int ret; |
fd88de56 SW |
548 | |
549 | bmap_lock(inode, create); | |
23591256 | 550 | ret = gfs2_block_pointers(inode, lblock, create, bh, &mp); |
fd88de56 | 551 | bmap_unlock(inode, create); |
7a6bbacb | 552 | return ret; |
fd88de56 SW |
553 | } |
554 | ||
555 | int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen) | |
556 | { | |
fd88de56 | 557 | struct metapath mp; |
23591256 | 558 | struct buffer_head bh = { .b_state = 0, .b_blocknr = 0 }; |
7a6bbacb | 559 | int ret; |
fd88de56 SW |
560 | int create = *new; |
561 | ||
562 | BUG_ON(!extlen); | |
563 | BUG_ON(!dblock); | |
564 | BUG_ON(!new); | |
565 | ||
23591256 | 566 | bh.b_size = 1 << (inode->i_blkbits + 5); |
fd88de56 | 567 | bmap_lock(inode, create); |
23591256 | 568 | ret = gfs2_block_pointers(inode, lblock, create, &bh, &mp); |
fd88de56 | 569 | bmap_unlock(inode, create); |
7a6bbacb SW |
570 | *extlen = bh.b_size >> inode->i_blkbits; |
571 | *dblock = bh.b_blocknr; | |
572 | if (buffer_new(&bh)) | |
573 | *new = 1; | |
574 | else | |
575 | *new = 0; | |
576 | return ret; | |
b3b94faa DT |
577 | } |
578 | ||
579 | /** | |
580 | * recursive_scan - recursively scan through the end of a file | |
581 | * @ip: the inode | |
582 | * @dibh: the dinode buffer | |
583 | * @mp: the path through the metadata to the point to start | |
584 | * @height: the height the recursion is at | |
585 | * @block: the indirect block to look at | |
586 | * @first: 1 if this is the first block | |
587 | * @bc: the call to make for each piece of metadata | |
588 | * @data: data opaque to this function to pass to @bc | |
589 | * | |
590 | * When this is first called @height and @block should be zero and | |
591 | * @first should be 1. | |
592 | * | |
593 | * Returns: errno | |
594 | */ | |
595 | ||
596 | static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh, | |
597 | struct metapath *mp, unsigned int height, | |
cd915493 | 598 | u64 block, int first, block_call_t bc, |
b3b94faa DT |
599 | void *data) |
600 | { | |
feaa7bba | 601 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa | 602 | struct buffer_head *bh = NULL; |
cd915493 SW |
603 | u64 *top, *bottom; |
604 | u64 bn; | |
b3b94faa DT |
605 | int error; |
606 | int mh_size = sizeof(struct gfs2_meta_header); | |
607 | ||
608 | if (!height) { | |
609 | error = gfs2_meta_inode_buffer(ip, &bh); | |
610 | if (error) | |
611 | return error; | |
612 | dibh = bh; | |
613 | ||
75d3b817 SW |
614 | top = (u64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + mp->mp_list[0]; |
615 | bottom = (u64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + sdp->sd_diptrs; | |
b3b94faa DT |
616 | } else { |
617 | error = gfs2_meta_indirect_buffer(ip, height, block, 0, &bh); | |
618 | if (error) | |
619 | return error; | |
620 | ||
cd915493 | 621 | top = (u64 *)(bh->b_data + mh_size) + |
c5392124 | 622 | (first ? mp->mp_list[height] : 0); |
b3b94faa | 623 | |
cd915493 | 624 | bottom = (u64 *)(bh->b_data + mh_size) + sdp->sd_inptrs; |
b3b94faa DT |
625 | } |
626 | ||
627 | error = bc(ip, dibh, bh, top, bottom, height, data); | |
628 | if (error) | |
629 | goto out; | |
630 | ||
631 | if (height < ip->i_di.di_height - 1) | |
632 | for (; top < bottom; top++, first = 0) { | |
633 | if (!*top) | |
634 | continue; | |
635 | ||
636 | bn = be64_to_cpu(*top); | |
637 | ||
638 | error = recursive_scan(ip, dibh, mp, height + 1, bn, | |
639 | first, bc, data); | |
640 | if (error) | |
641 | break; | |
642 | } | |
643 | ||
a91ea69f | 644 | out: |
b3b94faa | 645 | brelse(bh); |
b3b94faa DT |
646 | return error; |
647 | } | |
648 | ||
649 | /** | |
650 | * do_strip - Look for a layer a particular layer of the file and strip it off | |
651 | * @ip: the inode | |
652 | * @dibh: the dinode buffer | |
653 | * @bh: A buffer of pointers | |
654 | * @top: The first pointer in the buffer | |
655 | * @bottom: One more than the last pointer | |
656 | * @height: the height this buffer is at | |
657 | * @data: a pointer to a struct strip_mine | |
658 | * | |
659 | * Returns: errno | |
660 | */ | |
661 | ||
662 | static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh, | |
cd915493 | 663 | struct buffer_head *bh, u64 *top, u64 *bottom, |
b3b94faa DT |
664 | unsigned int height, void *data) |
665 | { | |
feaa7bba SW |
666 | struct strip_mine *sm = data; |
667 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); | |
b3b94faa | 668 | struct gfs2_rgrp_list rlist; |
cd915493 SW |
669 | u64 bn, bstart; |
670 | u32 blen; | |
671 | u64 *p; | |
b3b94faa DT |
672 | unsigned int rg_blocks = 0; |
673 | int metadata; | |
674 | unsigned int revokes = 0; | |
675 | int x; | |
676 | int error; | |
677 | ||
678 | if (!*top) | |
679 | sm->sm_first = 0; | |
680 | ||
681 | if (height != sm->sm_height) | |
682 | return 0; | |
683 | ||
684 | if (sm->sm_first) { | |
685 | top++; | |
686 | sm->sm_first = 0; | |
687 | } | |
688 | ||
18ec7d5c | 689 | metadata = (height != ip->i_di.di_height - 1); |
b3b94faa DT |
690 | if (metadata) |
691 | revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs; | |
692 | ||
693 | error = gfs2_rindex_hold(sdp, &ip->i_alloc.al_ri_gh); | |
694 | if (error) | |
695 | return error; | |
696 | ||
697 | memset(&rlist, 0, sizeof(struct gfs2_rgrp_list)); | |
698 | bstart = 0; | |
699 | blen = 0; | |
700 | ||
701 | for (p = top; p < bottom; p++) { | |
702 | if (!*p) | |
703 | continue; | |
704 | ||
705 | bn = be64_to_cpu(*p); | |
706 | ||
707 | if (bstart + blen == bn) | |
708 | blen++; | |
709 | else { | |
710 | if (bstart) | |
711 | gfs2_rlist_add(sdp, &rlist, bstart); | |
712 | ||
713 | bstart = bn; | |
714 | blen = 1; | |
715 | } | |
716 | } | |
717 | ||
718 | if (bstart) | |
719 | gfs2_rlist_add(sdp, &rlist, bstart); | |
720 | else | |
721 | goto out; /* Nothing to do */ | |
722 | ||
723 | gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, 0); | |
724 | ||
725 | for (x = 0; x < rlist.rl_rgrps; x++) { | |
726 | struct gfs2_rgrpd *rgd; | |
5c676f6d | 727 | rgd = rlist.rl_ghs[x].gh_gl->gl_object; |
b3b94faa DT |
728 | rg_blocks += rgd->rd_ri.ri_length; |
729 | } | |
730 | ||
731 | error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs); | |
732 | if (error) | |
733 | goto out_rlist; | |
734 | ||
735 | error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + | |
736 | RES_INDIRECT + RES_STATFS + RES_QUOTA, | |
737 | revokes); | |
738 | if (error) | |
739 | goto out_rg_gunlock; | |
740 | ||
741 | down_write(&ip->i_rw_mutex); | |
742 | ||
d4e9c4c3 SW |
743 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
744 | gfs2_trans_add_bh(ip->i_gl, bh, 1); | |
b3b94faa DT |
745 | |
746 | bstart = 0; | |
747 | blen = 0; | |
748 | ||
749 | for (p = top; p < bottom; p++) { | |
750 | if (!*p) | |
751 | continue; | |
752 | ||
753 | bn = be64_to_cpu(*p); | |
754 | ||
755 | if (bstart + blen == bn) | |
756 | blen++; | |
757 | else { | |
758 | if (bstart) { | |
759 | if (metadata) | |
760 | gfs2_free_meta(ip, bstart, blen); | |
761 | else | |
762 | gfs2_free_data(ip, bstart, blen); | |
763 | } | |
764 | ||
765 | bstart = bn; | |
766 | blen = 1; | |
767 | } | |
768 | ||
769 | *p = 0; | |
770 | if (!ip->i_di.di_blocks) | |
771 | gfs2_consist_inode(ip); | |
772 | ip->i_di.di_blocks--; | |
773 | } | |
774 | if (bstart) { | |
775 | if (metadata) | |
776 | gfs2_free_meta(ip, bstart, blen); | |
777 | else | |
778 | gfs2_free_data(ip, bstart, blen); | |
779 | } | |
780 | ||
781 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); | |
782 | ||
783 | gfs2_dinode_out(&ip->i_di, dibh->b_data); | |
784 | ||
785 | up_write(&ip->i_rw_mutex); | |
786 | ||
787 | gfs2_trans_end(sdp); | |
788 | ||
a91ea69f | 789 | out_rg_gunlock: |
b3b94faa | 790 | gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs); |
a91ea69f | 791 | out_rlist: |
b3b94faa | 792 | gfs2_rlist_free(&rlist); |
a91ea69f | 793 | out: |
b3b94faa | 794 | gfs2_glock_dq_uninit(&ip->i_alloc.al_ri_gh); |
b3b94faa DT |
795 | return error; |
796 | } | |
797 | ||
798 | /** | |
799 | * do_grow - Make a file look bigger than it is | |
800 | * @ip: the inode | |
801 | * @size: the size to set the file to | |
802 | * | |
803 | * Called with an exclusive lock on @ip. | |
804 | * | |
805 | * Returns: errno | |
806 | */ | |
807 | ||
cd915493 | 808 | static int do_grow(struct gfs2_inode *ip, u64 size) |
b3b94faa | 809 | { |
feaa7bba | 810 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
811 | struct gfs2_alloc *al; |
812 | struct buffer_head *dibh; | |
813 | unsigned int h; | |
814 | int error; | |
815 | ||
816 | al = gfs2_alloc_get(ip); | |
817 | ||
818 | error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
819 | if (error) | |
820 | goto out; | |
821 | ||
822 | error = gfs2_quota_check(ip, ip->i_di.di_uid, ip->i_di.di_gid); | |
823 | if (error) | |
824 | goto out_gunlock_q; | |
825 | ||
826 | al->al_requested = sdp->sd_max_height + RES_DATA; | |
827 | ||
828 | error = gfs2_inplace_reserve(ip); | |
829 | if (error) | |
830 | goto out_gunlock_q; | |
831 | ||
832 | error = gfs2_trans_begin(sdp, | |
833 | sdp->sd_max_height + al->al_rgd->rd_ri.ri_length + | |
834 | RES_JDATA + RES_DINODE + RES_STATFS + RES_QUOTA, 0); | |
835 | if (error) | |
836 | goto out_ipres; | |
837 | ||
838 | if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { | |
839 | if (gfs2_is_stuffed(ip)) { | |
f25ef0c1 | 840 | error = gfs2_unstuff_dinode(ip, NULL); |
b3b94faa DT |
841 | if (error) |
842 | goto out_end_trans; | |
843 | } | |
844 | ||
845 | h = calc_tree_height(ip, size); | |
846 | if (ip->i_di.di_height < h) { | |
847 | down_write(&ip->i_rw_mutex); | |
feaa7bba | 848 | error = build_height(&ip->i_inode, h); |
b3b94faa DT |
849 | up_write(&ip->i_rw_mutex); |
850 | if (error) | |
851 | goto out_end_trans; | |
852 | } | |
853 | } | |
854 | ||
855 | ip->i_di.di_size = size; | |
856 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); | |
857 | ||
858 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
859 | if (error) | |
860 | goto out_end_trans; | |
861 | ||
d4e9c4c3 | 862 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
863 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
864 | brelse(dibh); | |
865 | ||
a91ea69f | 866 | out_end_trans: |
b3b94faa | 867 | gfs2_trans_end(sdp); |
a91ea69f | 868 | out_ipres: |
b3b94faa | 869 | gfs2_inplace_release(ip); |
a91ea69f | 870 | out_gunlock_q: |
b3b94faa | 871 | gfs2_quota_unlock(ip); |
a91ea69f | 872 | out: |
b3b94faa | 873 | gfs2_alloc_put(ip); |
b3b94faa DT |
874 | return error; |
875 | } | |
876 | ||
ba7f7290 SW |
877 | |
878 | /** | |
879 | * gfs2_block_truncate_page - Deal with zeroing out data for truncate | |
880 | * | |
881 | * This is partly borrowed from ext3. | |
882 | */ | |
883 | static int gfs2_block_truncate_page(struct address_space *mapping) | |
884 | { | |
885 | struct inode *inode = mapping->host; | |
886 | struct gfs2_inode *ip = GFS2_I(inode); | |
887 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
888 | loff_t from = inode->i_size; | |
889 | unsigned long index = from >> PAGE_CACHE_SHIFT; | |
890 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
891 | unsigned blocksize, iblock, length, pos; | |
892 | struct buffer_head *bh; | |
893 | struct page *page; | |
894 | void *kaddr; | |
895 | int err; | |
896 | ||
897 | page = grab_cache_page(mapping, index); | |
898 | if (!page) | |
899 | return 0; | |
900 | ||
901 | blocksize = inode->i_sb->s_blocksize; | |
902 | length = blocksize - (offset & (blocksize - 1)); | |
903 | iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); | |
904 | ||
905 | if (!page_has_buffers(page)) | |
906 | create_empty_buffers(page, blocksize, 0); | |
907 | ||
908 | /* Find the buffer that contains "offset" */ | |
909 | bh = page_buffers(page); | |
910 | pos = blocksize; | |
911 | while (offset >= pos) { | |
912 | bh = bh->b_this_page; | |
913 | iblock++; | |
914 | pos += blocksize; | |
915 | } | |
916 | ||
917 | err = 0; | |
918 | ||
919 | if (!buffer_mapped(bh)) { | |
920 | gfs2_get_block(inode, iblock, bh, 0); | |
921 | /* unmapped? It's a hole - nothing to do */ | |
922 | if (!buffer_mapped(bh)) | |
923 | goto unlock; | |
924 | } | |
925 | ||
926 | /* Ok, it's mapped. Make sure it's up-to-date */ | |
927 | if (PageUptodate(page)) | |
928 | set_buffer_uptodate(bh); | |
929 | ||
930 | if (!buffer_uptodate(bh)) { | |
931 | err = -EIO; | |
932 | ll_rw_block(READ, 1, &bh); | |
933 | wait_on_buffer(bh); | |
934 | /* Uhhuh. Read error. Complain and punt. */ | |
935 | if (!buffer_uptodate(bh)) | |
936 | goto unlock; | |
937 | } | |
938 | ||
939 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) | |
940 | gfs2_trans_add_bh(ip->i_gl, bh, 0); | |
941 | ||
942 | kaddr = kmap_atomic(page, KM_USER0); | |
943 | memset(kaddr + offset, 0, length); | |
944 | flush_dcache_page(page); | |
945 | kunmap_atomic(kaddr, KM_USER0); | |
946 | ||
947 | unlock: | |
948 | unlock_page(page); | |
949 | page_cache_release(page); | |
950 | return err; | |
951 | } | |
952 | ||
cd915493 | 953 | static int trunc_start(struct gfs2_inode *ip, u64 size) |
b3b94faa | 954 | { |
feaa7bba | 955 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
956 | struct buffer_head *dibh; |
957 | int journaled = gfs2_is_jdata(ip); | |
958 | int error; | |
959 | ||
960 | error = gfs2_trans_begin(sdp, | |
c5392124 | 961 | RES_DINODE + (journaled ? RES_JDATA : 0), 0); |
b3b94faa DT |
962 | if (error) |
963 | return error; | |
964 | ||
965 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
966 | if (error) | |
967 | goto out; | |
968 | ||
969 | if (gfs2_is_stuffed(ip)) { | |
970 | ip->i_di.di_size = size; | |
971 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); | |
d4e9c4c3 | 972 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
973 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
974 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + size); | |
975 | error = 1; | |
976 | ||
977 | } else { | |
cd915493 | 978 | if (size & (u64)(sdp->sd_sb.sb_bsize - 1)) |
feaa7bba | 979 | error = gfs2_block_truncate_page(ip->i_inode.i_mapping); |
b3b94faa DT |
980 | |
981 | if (!error) { | |
982 | ip->i_di.di_size = size; | |
983 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); | |
984 | ip->i_di.di_flags |= GFS2_DIF_TRUNC_IN_PROG; | |
d4e9c4c3 | 985 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
986 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
987 | } | |
988 | } | |
989 | ||
990 | brelse(dibh); | |
991 | ||
a91ea69f | 992 | out: |
b3b94faa | 993 | gfs2_trans_end(sdp); |
b3b94faa DT |
994 | return error; |
995 | } | |
996 | ||
cd915493 | 997 | static int trunc_dealloc(struct gfs2_inode *ip, u64 size) |
b3b94faa DT |
998 | { |
999 | unsigned int height = ip->i_di.di_height; | |
cd915493 | 1000 | u64 lblock; |
b3b94faa DT |
1001 | struct metapath mp; |
1002 | int error; | |
1003 | ||
1004 | if (!size) | |
1005 | lblock = 0; | |
18ec7d5c | 1006 | else |
feaa7bba | 1007 | lblock = (size - 1) >> GFS2_SB(&ip->i_inode)->sd_sb.sb_bsize_shift; |
b3b94faa DT |
1008 | |
1009 | find_metapath(ip, lblock, &mp); | |
1010 | gfs2_alloc_get(ip); | |
1011 | ||
1012 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
1013 | if (error) | |
1014 | goto out; | |
1015 | ||
1016 | while (height--) { | |
1017 | struct strip_mine sm; | |
1018 | sm.sm_first = !!size; | |
1019 | sm.sm_height = height; | |
1020 | ||
1021 | error = recursive_scan(ip, NULL, &mp, 0, 0, 1, do_strip, &sm); | |
1022 | if (error) | |
1023 | break; | |
1024 | } | |
1025 | ||
1026 | gfs2_quota_unhold(ip); | |
1027 | ||
a91ea69f | 1028 | out: |
b3b94faa DT |
1029 | gfs2_alloc_put(ip); |
1030 | return error; | |
1031 | } | |
1032 | ||
1033 | static int trunc_end(struct gfs2_inode *ip) | |
1034 | { | |
feaa7bba | 1035 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
1036 | struct buffer_head *dibh; |
1037 | int error; | |
1038 | ||
1039 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1040 | if (error) | |
1041 | return error; | |
1042 | ||
1043 | down_write(&ip->i_rw_mutex); | |
1044 | ||
1045 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1046 | if (error) | |
1047 | goto out; | |
1048 | ||
1049 | if (!ip->i_di.di_size) { | |
1050 | ip->i_di.di_height = 0; | |
1051 | ip->i_di.di_goal_meta = | |
1052 | ip->i_di.di_goal_data = | |
1053 | ip->i_num.no_addr; | |
1054 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
1055 | } | |
1056 | ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); | |
1057 | ip->i_di.di_flags &= ~GFS2_DIF_TRUNC_IN_PROG; | |
1058 | ||
d4e9c4c3 | 1059 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
b3b94faa DT |
1060 | gfs2_dinode_out(&ip->i_di, dibh->b_data); |
1061 | brelse(dibh); | |
1062 | ||
a91ea69f | 1063 | out: |
b3b94faa | 1064 | up_write(&ip->i_rw_mutex); |
b3b94faa | 1065 | gfs2_trans_end(sdp); |
b3b94faa DT |
1066 | return error; |
1067 | } | |
1068 | ||
1069 | /** | |
1070 | * do_shrink - make a file smaller | |
1071 | * @ip: the inode | |
1072 | * @size: the size to make the file | |
1073 | * @truncator: function to truncate the last partial block | |
1074 | * | |
1075 | * Called with an exclusive lock on @ip. | |
1076 | * | |
1077 | * Returns: errno | |
1078 | */ | |
1079 | ||
cd915493 | 1080 | static int do_shrink(struct gfs2_inode *ip, u64 size) |
b3b94faa DT |
1081 | { |
1082 | int error; | |
1083 | ||
aa6a85a9 | 1084 | error = trunc_start(ip, size); |
b3b94faa DT |
1085 | if (error < 0) |
1086 | return error; | |
1087 | if (error > 0) | |
1088 | return 0; | |
1089 | ||
1090 | error = trunc_dealloc(ip, size); | |
1091 | if (!error) | |
1092 | error = trunc_end(ip); | |
1093 | ||
1094 | return error; | |
1095 | } | |
1096 | ||
1097 | /** | |
666a2c53 | 1098 | * gfs2_truncatei - make a file a given size |
b3b94faa DT |
1099 | * @ip: the inode |
1100 | * @size: the size to make the file | |
1101 | * @truncator: function to truncate the last partial block | |
1102 | * | |
1103 | * The file size can grow, shrink, or stay the same size. | |
1104 | * | |
1105 | * Returns: errno | |
1106 | */ | |
1107 | ||
cd915493 | 1108 | int gfs2_truncatei(struct gfs2_inode *ip, u64 size) |
b3b94faa DT |
1109 | { |
1110 | int error; | |
1111 | ||
feaa7bba | 1112 | if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), S_ISREG(ip->i_di.di_mode))) |
b3b94faa DT |
1113 | return -EINVAL; |
1114 | ||
1115 | if (size > ip->i_di.di_size) | |
1116 | error = do_grow(ip, size); | |
1117 | else | |
aa6a85a9 | 1118 | error = do_shrink(ip, size); |
b3b94faa DT |
1119 | |
1120 | return error; | |
1121 | } | |
1122 | ||
1123 | int gfs2_truncatei_resume(struct gfs2_inode *ip) | |
1124 | { | |
1125 | int error; | |
1126 | error = trunc_dealloc(ip, ip->i_di.di_size); | |
1127 | if (!error) | |
1128 | error = trunc_end(ip); | |
1129 | return error; | |
1130 | } | |
1131 | ||
1132 | int gfs2_file_dealloc(struct gfs2_inode *ip) | |
1133 | { | |
1134 | return trunc_dealloc(ip, 0); | |
1135 | } | |
1136 | ||
1137 | /** | |
1138 | * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file | |
1139 | * @ip: the file | |
1140 | * @len: the number of bytes to be written to the file | |
1141 | * @data_blocks: returns the number of data blocks required | |
1142 | * @ind_blocks: returns the number of indirect blocks required | |
1143 | * | |
1144 | */ | |
1145 | ||
1146 | void gfs2_write_calc_reserv(struct gfs2_inode *ip, unsigned int len, | |
1147 | unsigned int *data_blocks, unsigned int *ind_blocks) | |
1148 | { | |
feaa7bba | 1149 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
1150 | unsigned int tmp; |
1151 | ||
18ec7d5c | 1152 | if (gfs2_is_dir(ip)) { |
5c676f6d | 1153 | *data_blocks = DIV_ROUND_UP(len, sdp->sd_jbsize) + 2; |
b3b94faa DT |
1154 | *ind_blocks = 3 * (sdp->sd_max_jheight - 1); |
1155 | } else { | |
1156 | *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3; | |
1157 | *ind_blocks = 3 * (sdp->sd_max_height - 1); | |
1158 | } | |
1159 | ||
1160 | for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) { | |
5c676f6d | 1161 | tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); |
b3b94faa DT |
1162 | *ind_blocks += tmp; |
1163 | } | |
1164 | } | |
1165 | ||
1166 | /** | |
1167 | * gfs2_write_alloc_required - figure out if a write will require an allocation | |
1168 | * @ip: the file being written to | |
1169 | * @offset: the offset to write to | |
1170 | * @len: the number of bytes being written | |
1171 | * @alloc_required: set to 1 if an alloc is required, 0 otherwise | |
1172 | * | |
1173 | * Returns: errno | |
1174 | */ | |
1175 | ||
cd915493 | 1176 | int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset, |
b3b94faa DT |
1177 | unsigned int len, int *alloc_required) |
1178 | { | |
feaa7bba | 1179 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
cd915493 SW |
1180 | u64 lblock, lblock_stop, dblock; |
1181 | u32 extlen; | |
b3b94faa DT |
1182 | int new = 0; |
1183 | int error = 0; | |
1184 | ||
1185 | *alloc_required = 0; | |
1186 | ||
1187 | if (!len) | |
1188 | return 0; | |
1189 | ||
1190 | if (gfs2_is_stuffed(ip)) { | |
1191 | if (offset + len > | |
1192 | sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) | |
1193 | *alloc_required = 1; | |
1194 | return 0; | |
1195 | } | |
1196 | ||
18ec7d5c | 1197 | if (gfs2_is_dir(ip)) { |
b3b94faa DT |
1198 | unsigned int bsize = sdp->sd_jbsize; |
1199 | lblock = offset; | |
1200 | do_div(lblock, bsize); | |
1201 | lblock_stop = offset + len + bsize - 1; | |
1202 | do_div(lblock_stop, bsize); | |
1203 | } else { | |
1204 | unsigned int shift = sdp->sd_sb.sb_bsize_shift; | |
1205 | lblock = offset >> shift; | |
1206 | lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift; | |
1207 | } | |
1208 | ||
1209 | for (; lblock < lblock_stop; lblock += extlen) { | |
feaa7bba | 1210 | error = gfs2_extent_map(&ip->i_inode, lblock, &new, &dblock, &extlen); |
b3b94faa DT |
1211 | if (error) |
1212 | return error; | |
1213 | ||
1214 | if (!dblock) { | |
1215 | *alloc_required = 1; | |
1216 | return 0; | |
1217 | } | |
1218 | } | |
1219 | ||
1220 | return 0; | |
1221 | } | |
1222 |