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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 | ||
b3b94faa DT |
10 | #include <linux/slab.h> |
11 | #include <linux/spinlock.h> | |
12 | #include <linux/completion.h> | |
13 | #include <linux/buffer_head.h> | |
5c676f6d | 14 | #include <linux/gfs2_ondisk.h> |
71b86f56 | 15 | #include <linux/crc32.h> |
7d308590 | 16 | #include <linux/lm_interface.h> |
b3b94faa DT |
17 | |
18 | #include "gfs2.h" | |
5c676f6d | 19 | #include "incore.h" |
b3b94faa DT |
20 | #include "bmap.h" |
21 | #include "glock.h" | |
22 | #include "inode.h" | |
b3b94faa | 23 | #include "meta_io.h" |
b3b94faa DT |
24 | #include "quota.h" |
25 | #include "rgrp.h" | |
26 | #include "trans.h" | |
18ec7d5c | 27 | #include "dir.h" |
5c676f6d | 28 | #include "util.h" |
ba7f7290 | 29 | #include "ops_address.h" |
b3b94faa DT |
30 | |
31 | /* This doesn't need to be that large as max 64 bit pointers in a 4k | |
32 | * block is 512, so __u16 is fine for that. It saves stack space to | |
33 | * keep it small. | |
34 | */ | |
35 | struct metapath { | |
36 | __u16 mp_list[GFS2_MAX_META_HEIGHT]; | |
37 | }; | |
38 | ||
39 | typedef int (*block_call_t) (struct gfs2_inode *ip, struct buffer_head *dibh, | |
b44b84d7 AV |
40 | struct buffer_head *bh, __be64 *top, |
41 | __be64 *bottom, unsigned int height, | |
b3b94faa DT |
42 | void *data); |
43 | ||
44 | struct strip_mine { | |
45 | int sm_first; | |
46 | unsigned int sm_height; | |
47 | }; | |
48 | ||
f25ef0c1 SW |
49 | /** |
50 | * gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page | |
51 | * @ip: the inode | |
52 | * @dibh: the dinode buffer | |
53 | * @block: the block number that was allocated | |
54 | * @private: any locked page held by the caller process | |
55 | * | |
56 | * Returns: errno | |
57 | */ | |
58 | ||
59 | static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh, | |
cd915493 | 60 | u64 block, struct page *page) |
f25ef0c1 SW |
61 | { |
62 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); | |
63 | struct inode *inode = &ip->i_inode; | |
64 | struct buffer_head *bh; | |
65 | int release = 0; | |
66 | ||
67 | if (!page || page->index) { | |
68 | page = grab_cache_page(inode->i_mapping, 0); | |
69 | if (!page) | |
70 | return -ENOMEM; | |
71 | release = 1; | |
72 | } | |
73 | ||
74 | if (!PageUptodate(page)) { | |
75 | void *kaddr = kmap(page); | |
76 | ||
77 | memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), | |
78 | ip->i_di.di_size); | |
79 | memset(kaddr + ip->i_di.di_size, 0, | |
80 | PAGE_CACHE_SIZE - ip->i_di.di_size); | |
81 | kunmap(page); | |
82 | ||
83 | SetPageUptodate(page); | |
84 | } | |
85 | ||
86 | if (!page_has_buffers(page)) | |
87 | create_empty_buffers(page, 1 << inode->i_blkbits, | |
88 | (1 << BH_Uptodate)); | |
89 | ||
90 | bh = page_buffers(page); | |
91 | ||
92 | if (!buffer_mapped(bh)) | |
93 | map_bh(bh, inode->i_sb, block); | |
94 | ||
95 | set_buffer_uptodate(bh); | |
eaf96527 SW |
96 | if (!gfs2_is_jdata(ip)) |
97 | mark_buffer_dirty(bh); | |
8475487b BP |
98 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) |
99 | gfs2_trans_add_bh(ip->i_gl, bh, 0); | |
f25ef0c1 SW |
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++; |
9e2dbdac | 166 | gfs2_set_inode_blocks(&ip->i_inode); |
48516ced | 167 | di->di_blocks = cpu_to_be64(ip->i_di.di_blocks); |
b3b94faa DT |
168 | } |
169 | ||
170 | ip->i_di.di_height = 1; | |
48516ced | 171 | di->di_height = cpu_to_be16(1); |
b3b94faa | 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]; | |
48516ced | 232 | struct gfs2_dinode *di; |
b3b94faa | 233 | int error; |
b44b84d7 | 234 | __be64 *bp; |
e90c01e1 SW |
235 | u64 bn; |
236 | unsigned n; | |
b3b94faa | 237 | |
e90c01e1 SW |
238 | if (height <= ip->i_di.di_height) |
239 | return 0; | |
b3b94faa | 240 | |
e90c01e1 SW |
241 | error = gfs2_meta_inode_buffer(ip, &dibh); |
242 | if (error) | |
243 | return error; | |
b3b94faa | 244 | |
e90c01e1 SW |
245 | for(n = 0; n < new_height; n++) { |
246 | bn = gfs2_alloc_meta(ip); | |
247 | blocks[n] = gfs2_meta_new(ip->i_gl, bn); | |
248 | gfs2_trans_add_bh(ip->i_gl, blocks[n], 1); | |
249 | } | |
907b9bce | 250 | |
e90c01e1 SW |
251 | n = 0; |
252 | bn = blocks[0]->b_blocknr; | |
253 | if (new_height > 1) { | |
254 | for(; n < new_height-1; n++) { | |
255 | gfs2_metatype_set(blocks[n], GFS2_METATYPE_IN, | |
b3b94faa | 256 | GFS2_FORMAT_IN); |
e90c01e1 SW |
257 | gfs2_buffer_clear_tail(blocks[n], |
258 | sizeof(struct gfs2_meta_header)); | |
b44b84d7 | 259 | bp = (__be64 *)(blocks[n]->b_data + |
e90c01e1 SW |
260 | sizeof(struct gfs2_meta_header)); |
261 | *bp = cpu_to_be64(blocks[n+1]->b_blocknr); | |
262 | brelse(blocks[n]); | |
263 | blocks[n] = NULL; | |
b3b94faa | 264 | } |
b3b94faa | 265 | } |
e90c01e1 SW |
266 | gfs2_metatype_set(blocks[n], GFS2_METATYPE_IN, GFS2_FORMAT_IN); |
267 | gfs2_buffer_copy_tail(blocks[n], sizeof(struct gfs2_meta_header), | |
268 | dibh, sizeof(struct gfs2_dinode)); | |
269 | brelse(blocks[n]); | |
270 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
48516ced | 271 | di = (struct gfs2_dinode *)dibh->b_data; |
e90c01e1 | 272 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
48516ced | 273 | *(__be64 *)(di + 1) = cpu_to_be64(bn); |
e90c01e1 SW |
274 | ip->i_di.di_height += new_height; |
275 | ip->i_di.di_blocks += new_height; | |
9e2dbdac | 276 | gfs2_set_inode_blocks(&ip->i_inode); |
48516ced SW |
277 | di->di_height = cpu_to_be16(ip->i_di.di_height); |
278 | di->di_blocks = cpu_to_be64(ip->i_di.di_blocks); | |
e90c01e1 SW |
279 | brelse(dibh); |
280 | return error; | |
b3b94faa DT |
281 | } |
282 | ||
283 | /** | |
284 | * find_metapath - Find path through the metadata tree | |
285 | * @ip: The inode pointer | |
286 | * @mp: The metapath to return the result in | |
287 | * @block: The disk block to look up | |
288 | * | |
289 | * This routine returns a struct metapath structure that defines a path | |
290 | * through the metadata of inode "ip" to get to block "block". | |
291 | * | |
292 | * Example: | |
293 | * Given: "ip" is a height 3 file, "offset" is 101342453, and this is a | |
294 | * filesystem with a blocksize of 4096. | |
295 | * | |
296 | * find_metapath() would return a struct metapath structure set to: | |
297 | * mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48, | |
298 | * and mp_list[2] = 165. | |
299 | * | |
300 | * That means that in order to get to the block containing the byte at | |
301 | * offset 101342453, we would load the indirect block pointed to by pointer | |
302 | * 0 in the dinode. We would then load the indirect block pointed to by | |
303 | * pointer 48 in that indirect block. We would then load the data block | |
304 | * pointed to by pointer 165 in that indirect block. | |
305 | * | |
306 | * ---------------------------------------- | |
307 | * | Dinode | | | |
308 | * | | 4| | |
309 | * | |0 1 2 3 4 5 9| | |
310 | * | | 6| | |
311 | * ---------------------------------------- | |
312 | * | | |
313 | * | | |
314 | * V | |
315 | * ---------------------------------------- | |
316 | * | Indirect Block | | |
317 | * | 5| | |
318 | * | 4 4 4 4 4 5 5 1| | |
319 | * |0 5 6 7 8 9 0 1 2| | |
320 | * ---------------------------------------- | |
321 | * | | |
322 | * | | |
323 | * V | |
324 | * ---------------------------------------- | |
325 | * | Indirect Block | | |
326 | * | 1 1 1 1 1 5| | |
327 | * | 6 6 6 6 6 1| | |
328 | * |0 3 4 5 6 7 2| | |
329 | * ---------------------------------------- | |
330 | * | | |
331 | * | | |
332 | * V | |
333 | * ---------------------------------------- | |
334 | * | Data block containing offset | | |
335 | * | 101342453 | | |
336 | * | | | |
337 | * | | | |
338 | * ---------------------------------------- | |
339 | * | |
340 | */ | |
341 | ||
cd915493 | 342 | static void find_metapath(struct gfs2_inode *ip, u64 block, |
568f4c96 | 343 | struct metapath *mp) |
b3b94faa | 344 | { |
feaa7bba | 345 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
cd915493 | 346 | u64 b = block; |
b3b94faa DT |
347 | unsigned int i; |
348 | ||
349 | for (i = ip->i_di.di_height; i--;) | |
c2668711 | 350 | mp->mp_list[i] = do_div(b, sdp->sd_inptrs); |
b3b94faa DT |
351 | |
352 | } | |
353 | ||
354 | /** | |
355 | * metapointer - Return pointer to start of metadata in a buffer | |
356 | * @bh: The buffer | |
357 | * @height: The metadata height (0 = dinode) | |
358 | * @mp: The metapath | |
359 | * | |
360 | * Return a pointer to the block number of the next height of the metadata | |
361 | * tree given a buffer containing the pointer to the current height of the | |
362 | * metadata tree. | |
363 | */ | |
364 | ||
b44b84d7 | 365 | static inline __be64 *metapointer(struct buffer_head *bh, int *boundary, |
fd88de56 | 366 | unsigned int height, const struct metapath *mp) |
b3b94faa DT |
367 | { |
368 | unsigned int head_size = (height > 0) ? | |
369 | sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode); | |
b44b84d7 | 370 | __be64 *ptr; |
fd88de56 | 371 | *boundary = 0; |
b44b84d7 AV |
372 | ptr = ((__be64 *)(bh->b_data + head_size)) + mp->mp_list[height]; |
373 | if (ptr + 1 == (__be64 *)(bh->b_data + bh->b_size)) | |
fd88de56 SW |
374 | *boundary = 1; |
375 | return ptr; | |
b3b94faa DT |
376 | } |
377 | ||
378 | /** | |
379 | * lookup_block - Get the next metadata block in metadata tree | |
380 | * @ip: The GFS2 inode | |
381 | * @bh: Buffer containing the pointers to metadata blocks | |
382 | * @height: The height of the tree (0 = dinode) | |
383 | * @mp: The metapath | |
384 | * @create: Non-zero if we may create a new meatdata block | |
385 | * @new: Used to indicate if we did create a new metadata block | |
386 | * @block: the returned disk block number | |
387 | * | |
388 | * Given a metatree, complete to a particular height, checks to see if the next | |
389 | * height of the tree exists. If not the next height of the tree is created. | |
390 | * The block number of the next height of the metadata tree is returned. | |
391 | * | |
392 | */ | |
393 | ||
fd88de56 SW |
394 | static int lookup_block(struct gfs2_inode *ip, struct buffer_head *bh, |
395 | unsigned int height, struct metapath *mp, int create, | |
cd915493 | 396 | int *new, u64 *block) |
b3b94faa | 397 | { |
fd88de56 | 398 | int boundary; |
b44b84d7 | 399 | __be64 *ptr = metapointer(bh, &boundary, height, mp); |
b3b94faa DT |
400 | |
401 | if (*ptr) { | |
402 | *block = be64_to_cpu(*ptr); | |
fd88de56 | 403 | return boundary; |
b3b94faa DT |
404 | } |
405 | ||
406 | *block = 0; | |
407 | ||
408 | if (!create) | |
fd88de56 | 409 | return 0; |
b3b94faa | 410 | |
fd88de56 | 411 | if (height == ip->i_di.di_height - 1 && !gfs2_is_dir(ip)) |
b3b94faa DT |
412 | *block = gfs2_alloc_data(ip); |
413 | else | |
414 | *block = gfs2_alloc_meta(ip); | |
415 | ||
d4e9c4c3 | 416 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
417 | |
418 | *ptr = cpu_to_be64(*block); | |
419 | ip->i_di.di_blocks++; | |
9e2dbdac | 420 | gfs2_set_inode_blocks(&ip->i_inode); |
b3b94faa DT |
421 | |
422 | *new = 1; | |
fd88de56 | 423 | return 0; |
b3b94faa DT |
424 | } |
425 | ||
4cf1ed81 SW |
426 | static inline void bmap_lock(struct inode *inode, int create) |
427 | { | |
428 | struct gfs2_inode *ip = GFS2_I(inode); | |
429 | if (create) | |
430 | down_write(&ip->i_rw_mutex); | |
431 | else | |
432 | down_read(&ip->i_rw_mutex); | |
433 | } | |
434 | ||
435 | static inline void bmap_unlock(struct inode *inode, int create) | |
436 | { | |
437 | struct gfs2_inode *ip = GFS2_I(inode); | |
438 | if (create) | |
439 | up_write(&ip->i_rw_mutex); | |
440 | else | |
441 | up_read(&ip->i_rw_mutex); | |
442 | } | |
443 | ||
b3b94faa | 444 | /** |
4cf1ed81 | 445 | * gfs2_block_map - Map a block from an inode to a disk block |
fd88de56 | 446 | * @inode: The inode |
b3b94faa | 447 | * @lblock: The logical block number |
4cf1ed81 | 448 | * @bh_map: The bh to be mapped |
b3b94faa DT |
449 | * |
450 | * Find the block number on the current device which corresponds to an | |
451 | * inode's block. If the block had to be created, "new" will be set. | |
452 | * | |
453 | * Returns: errno | |
454 | */ | |
455 | ||
4cf1ed81 SW |
456 | int gfs2_block_map(struct inode *inode, u64 lblock, int create, |
457 | struct buffer_head *bh_map) | |
b3b94faa | 458 | { |
feaa7bba SW |
459 | struct gfs2_inode *ip = GFS2_I(inode); |
460 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
b3b94faa | 461 | struct buffer_head *bh; |
b3b94faa DT |
462 | unsigned int bsize; |
463 | unsigned int height; | |
464 | unsigned int end_of_metadata; | |
465 | unsigned int x; | |
466 | int error = 0; | |
7a6bbacb SW |
467 | int new = 0; |
468 | u64 dblock = 0; | |
469 | int boundary; | |
23591256 | 470 | unsigned int maxlen = bh_map->b_size >> inode->i_blkbits; |
4cf1ed81 SW |
471 | struct metapath mp; |
472 | u64 size; | |
b3b94faa | 473 | |
7276b3b0 SW |
474 | BUG_ON(maxlen == 0); |
475 | ||
b3b94faa | 476 | if (gfs2_assert_warn(sdp, !gfs2_is_stuffed(ip))) |
7a6bbacb | 477 | return 0; |
b3b94faa | 478 | |
4cf1ed81 SW |
479 | bmap_lock(inode, create); |
480 | clear_buffer_mapped(bh_map); | |
481 | clear_buffer_new(bh_map); | |
482 | clear_buffer_boundary(bh_map); | |
75d3b817 | 483 | bsize = gfs2_is_dir(ip) ? sdp->sd_jbsize : sdp->sd_sb.sb_bsize; |
4cf1ed81 SW |
484 | size = (lblock + 1) * bsize; |
485 | ||
486 | if (size > ip->i_di.di_size) { | |
487 | height = calc_tree_height(ip, size); | |
488 | if (ip->i_di.di_height < height) { | |
489 | if (!create) | |
490 | goto out_ok; | |
491 | ||
492 | error = build_height(inode, height); | |
493 | if (error) | |
494 | goto out_fail; | |
495 | } | |
b3b94faa DT |
496 | } |
497 | ||
4cf1ed81 | 498 | find_metapath(ip, lblock, &mp); |
b3b94faa | 499 | end_of_metadata = ip->i_di.di_height - 1; |
b3b94faa DT |
500 | error = gfs2_meta_inode_buffer(ip, &bh); |
501 | if (error) | |
4cf1ed81 | 502 | goto out_fail; |
b3b94faa DT |
503 | |
504 | for (x = 0; x < end_of_metadata; x++) { | |
4cf1ed81 | 505 | lookup_block(ip, bh, x, &mp, create, &new, &dblock); |
b3b94faa | 506 | brelse(bh); |
7a6bbacb | 507 | if (!dblock) |
4cf1ed81 | 508 | goto out_ok; |
b3b94faa | 509 | |
7a6bbacb | 510 | error = gfs2_meta_indirect_buffer(ip, x+1, dblock, new, &bh); |
b3b94faa | 511 | if (error) |
4cf1ed81 | 512 | goto out_fail; |
b3b94faa DT |
513 | } |
514 | ||
4cf1ed81 | 515 | boundary = lookup_block(ip, bh, end_of_metadata, &mp, create, &new, &dblock); |
7a6bbacb SW |
516 | if (dblock) { |
517 | map_bh(bh_map, inode->i_sb, dblock); | |
518 | if (boundary) | |
4cf1ed81 | 519 | set_buffer_boundary(bh_map); |
7a6bbacb SW |
520 | if (new) { |
521 | struct buffer_head *dibh; | |
522 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
523 | if (!error) { | |
524 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
539e5d6b | 525 | gfs2_dinode_out(ip, dibh->b_data); |
7a6bbacb SW |
526 | brelse(dibh); |
527 | } | |
528 | set_buffer_new(bh_map); | |
529 | goto out_brelse; | |
530 | } | |
531 | while(--maxlen && !buffer_boundary(bh_map)) { | |
532 | u64 eblock; | |
533 | ||
4cf1ed81 SW |
534 | mp.mp_list[end_of_metadata]++; |
535 | boundary = lookup_block(ip, bh, end_of_metadata, &mp, 0, &new, &eblock); | |
7a6bbacb SW |
536 | if (eblock != ++dblock) |
537 | break; | |
f3b30912 | 538 | bh_map->b_size += (1 << inode->i_blkbits); |
7a6bbacb SW |
539 | if (boundary) |
540 | set_buffer_boundary(bh_map); | |
b3b94faa DT |
541 | } |
542 | } | |
7a6bbacb SW |
543 | out_brelse: |
544 | brelse(bh); | |
4cf1ed81 SW |
545 | out_ok: |
546 | error = 0; | |
547 | out_fail: | |
fd88de56 | 548 | bmap_unlock(inode, create); |
4cf1ed81 | 549 | return error; |
fd88de56 SW |
550 | } |
551 | ||
552 | int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen) | |
553 | { | |
23591256 | 554 | struct buffer_head bh = { .b_state = 0, .b_blocknr = 0 }; |
7a6bbacb | 555 | int ret; |
fd88de56 SW |
556 | int create = *new; |
557 | ||
558 | BUG_ON(!extlen); | |
559 | BUG_ON(!dblock); | |
560 | BUG_ON(!new); | |
561 | ||
23591256 | 562 | bh.b_size = 1 << (inode->i_blkbits + 5); |
4cf1ed81 | 563 | ret = gfs2_block_map(inode, lblock, create, &bh); |
7a6bbacb SW |
564 | *extlen = bh.b_size >> inode->i_blkbits; |
565 | *dblock = bh.b_blocknr; | |
566 | if (buffer_new(&bh)) | |
567 | *new = 1; | |
568 | else | |
569 | *new = 0; | |
570 | return ret; | |
b3b94faa DT |
571 | } |
572 | ||
573 | /** | |
574 | * recursive_scan - recursively scan through the end of a file | |
575 | * @ip: the inode | |
576 | * @dibh: the dinode buffer | |
577 | * @mp: the path through the metadata to the point to start | |
578 | * @height: the height the recursion is at | |
579 | * @block: the indirect block to look at | |
580 | * @first: 1 if this is the first block | |
581 | * @bc: the call to make for each piece of metadata | |
582 | * @data: data opaque to this function to pass to @bc | |
583 | * | |
584 | * When this is first called @height and @block should be zero and | |
585 | * @first should be 1. | |
586 | * | |
587 | * Returns: errno | |
588 | */ | |
589 | ||
590 | static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh, | |
591 | struct metapath *mp, unsigned int height, | |
cd915493 | 592 | u64 block, int first, block_call_t bc, |
b3b94faa DT |
593 | void *data) |
594 | { | |
feaa7bba | 595 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa | 596 | struct buffer_head *bh = NULL; |
b44b84d7 | 597 | __be64 *top, *bottom; |
cd915493 | 598 | u64 bn; |
b3b94faa DT |
599 | int error; |
600 | int mh_size = sizeof(struct gfs2_meta_header); | |
601 | ||
602 | if (!height) { | |
603 | error = gfs2_meta_inode_buffer(ip, &bh); | |
604 | if (error) | |
605 | return error; | |
606 | dibh = bh; | |
607 | ||
b44b84d7 AV |
608 | top = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + mp->mp_list[0]; |
609 | bottom = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + sdp->sd_diptrs; | |
b3b94faa DT |
610 | } else { |
611 | error = gfs2_meta_indirect_buffer(ip, height, block, 0, &bh); | |
612 | if (error) | |
613 | return error; | |
614 | ||
b44b84d7 | 615 | top = (__be64 *)(bh->b_data + mh_size) + |
c5392124 | 616 | (first ? mp->mp_list[height] : 0); |
b3b94faa | 617 | |
b44b84d7 | 618 | bottom = (__be64 *)(bh->b_data + mh_size) + sdp->sd_inptrs; |
b3b94faa DT |
619 | } |
620 | ||
621 | error = bc(ip, dibh, bh, top, bottom, height, data); | |
622 | if (error) | |
623 | goto out; | |
624 | ||
625 | if (height < ip->i_di.di_height - 1) | |
626 | for (; top < bottom; top++, first = 0) { | |
627 | if (!*top) | |
628 | continue; | |
629 | ||
630 | bn = be64_to_cpu(*top); | |
631 | ||
632 | error = recursive_scan(ip, dibh, mp, height + 1, bn, | |
633 | first, bc, data); | |
634 | if (error) | |
635 | break; | |
636 | } | |
637 | ||
a91ea69f | 638 | out: |
b3b94faa | 639 | brelse(bh); |
b3b94faa DT |
640 | return error; |
641 | } | |
642 | ||
643 | /** | |
644 | * do_strip - Look for a layer a particular layer of the file and strip it off | |
645 | * @ip: the inode | |
646 | * @dibh: the dinode buffer | |
647 | * @bh: A buffer of pointers | |
648 | * @top: The first pointer in the buffer | |
649 | * @bottom: One more than the last pointer | |
650 | * @height: the height this buffer is at | |
651 | * @data: a pointer to a struct strip_mine | |
652 | * | |
653 | * Returns: errno | |
654 | */ | |
655 | ||
656 | static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh, | |
b44b84d7 | 657 | struct buffer_head *bh, __be64 *top, __be64 *bottom, |
b3b94faa DT |
658 | unsigned int height, void *data) |
659 | { | |
feaa7bba SW |
660 | struct strip_mine *sm = data; |
661 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); | |
b3b94faa | 662 | struct gfs2_rgrp_list rlist; |
cd915493 SW |
663 | u64 bn, bstart; |
664 | u32 blen; | |
b44b84d7 | 665 | __be64 *p; |
b3b94faa DT |
666 | unsigned int rg_blocks = 0; |
667 | int metadata; | |
668 | unsigned int revokes = 0; | |
669 | int x; | |
670 | int error; | |
671 | ||
672 | if (!*top) | |
673 | sm->sm_first = 0; | |
674 | ||
675 | if (height != sm->sm_height) | |
676 | return 0; | |
677 | ||
678 | if (sm->sm_first) { | |
679 | top++; | |
680 | sm->sm_first = 0; | |
681 | } | |
682 | ||
18ec7d5c | 683 | metadata = (height != ip->i_di.di_height - 1); |
b3b94faa DT |
684 | if (metadata) |
685 | revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs; | |
686 | ||
687 | error = gfs2_rindex_hold(sdp, &ip->i_alloc.al_ri_gh); | |
688 | if (error) | |
689 | return error; | |
690 | ||
691 | memset(&rlist, 0, sizeof(struct gfs2_rgrp_list)); | |
692 | bstart = 0; | |
693 | blen = 0; | |
694 | ||
695 | for (p = top; p < bottom; p++) { | |
696 | if (!*p) | |
697 | continue; | |
698 | ||
699 | bn = be64_to_cpu(*p); | |
700 | ||
701 | if (bstart + blen == bn) | |
702 | blen++; | |
703 | else { | |
704 | if (bstart) | |
705 | gfs2_rlist_add(sdp, &rlist, bstart); | |
706 | ||
707 | bstart = bn; | |
708 | blen = 1; | |
709 | } | |
710 | } | |
711 | ||
712 | if (bstart) | |
713 | gfs2_rlist_add(sdp, &rlist, bstart); | |
714 | else | |
715 | goto out; /* Nothing to do */ | |
716 | ||
717 | gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, 0); | |
718 | ||
719 | for (x = 0; x < rlist.rl_rgrps; x++) { | |
720 | struct gfs2_rgrpd *rgd; | |
5c676f6d | 721 | rgd = rlist.rl_ghs[x].gh_gl->gl_object; |
bb8d8a6f | 722 | rg_blocks += rgd->rd_length; |
b3b94faa DT |
723 | } |
724 | ||
725 | error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs); | |
726 | if (error) | |
727 | goto out_rlist; | |
728 | ||
729 | error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + | |
730 | RES_INDIRECT + RES_STATFS + RES_QUOTA, | |
731 | revokes); | |
732 | if (error) | |
733 | goto out_rg_gunlock; | |
734 | ||
735 | down_write(&ip->i_rw_mutex); | |
736 | ||
d4e9c4c3 SW |
737 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
738 | gfs2_trans_add_bh(ip->i_gl, bh, 1); | |
b3b94faa DT |
739 | |
740 | bstart = 0; | |
741 | blen = 0; | |
742 | ||
743 | for (p = top; p < bottom; p++) { | |
744 | if (!*p) | |
745 | continue; | |
746 | ||
747 | bn = be64_to_cpu(*p); | |
748 | ||
749 | if (bstart + blen == bn) | |
750 | blen++; | |
751 | else { | |
752 | if (bstart) { | |
753 | if (metadata) | |
754 | gfs2_free_meta(ip, bstart, blen); | |
755 | else | |
756 | gfs2_free_data(ip, bstart, blen); | |
757 | } | |
758 | ||
759 | bstart = bn; | |
760 | blen = 1; | |
761 | } | |
762 | ||
763 | *p = 0; | |
764 | if (!ip->i_di.di_blocks) | |
765 | gfs2_consist_inode(ip); | |
766 | ip->i_di.di_blocks--; | |
9e2dbdac | 767 | gfs2_set_inode_blocks(&ip->i_inode); |
b3b94faa DT |
768 | } |
769 | if (bstart) { | |
770 | if (metadata) | |
771 | gfs2_free_meta(ip, bstart, blen); | |
772 | else | |
773 | gfs2_free_data(ip, bstart, blen); | |
774 | } | |
775 | ||
4bd91ba1 | 776 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
b3b94faa | 777 | |
539e5d6b | 778 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
779 | |
780 | up_write(&ip->i_rw_mutex); | |
781 | ||
782 | gfs2_trans_end(sdp); | |
783 | ||
a91ea69f | 784 | out_rg_gunlock: |
b3b94faa | 785 | gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs); |
a91ea69f | 786 | out_rlist: |
b3b94faa | 787 | gfs2_rlist_free(&rlist); |
a91ea69f | 788 | out: |
b3b94faa | 789 | gfs2_glock_dq_uninit(&ip->i_alloc.al_ri_gh); |
b3b94faa DT |
790 | return error; |
791 | } | |
792 | ||
793 | /** | |
794 | * do_grow - Make a file look bigger than it is | |
795 | * @ip: the inode | |
796 | * @size: the size to set the file to | |
797 | * | |
798 | * Called with an exclusive lock on @ip. | |
799 | * | |
800 | * Returns: errno | |
801 | */ | |
802 | ||
cd915493 | 803 | static int do_grow(struct gfs2_inode *ip, u64 size) |
b3b94faa | 804 | { |
feaa7bba | 805 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
806 | struct gfs2_alloc *al; |
807 | struct buffer_head *dibh; | |
808 | unsigned int h; | |
809 | int error; | |
810 | ||
811 | al = gfs2_alloc_get(ip); | |
812 | ||
813 | error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
814 | if (error) | |
815 | goto out; | |
816 | ||
2933f925 | 817 | error = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid); |
b3b94faa DT |
818 | if (error) |
819 | goto out_gunlock_q; | |
820 | ||
821 | al->al_requested = sdp->sd_max_height + RES_DATA; | |
822 | ||
823 | error = gfs2_inplace_reserve(ip); | |
824 | if (error) | |
825 | goto out_gunlock_q; | |
826 | ||
827 | error = gfs2_trans_begin(sdp, | |
bb8d8a6f | 828 | sdp->sd_max_height + al->al_rgd->rd_length + |
b3b94faa DT |
829 | RES_JDATA + RES_DINODE + RES_STATFS + RES_QUOTA, 0); |
830 | if (error) | |
831 | goto out_ipres; | |
832 | ||
833 | if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { | |
834 | if (gfs2_is_stuffed(ip)) { | |
f25ef0c1 | 835 | error = gfs2_unstuff_dinode(ip, NULL); |
b3b94faa DT |
836 | if (error) |
837 | goto out_end_trans; | |
838 | } | |
839 | ||
840 | h = calc_tree_height(ip, size); | |
841 | if (ip->i_di.di_height < h) { | |
842 | down_write(&ip->i_rw_mutex); | |
feaa7bba | 843 | error = build_height(&ip->i_inode, h); |
b3b94faa DT |
844 | up_write(&ip->i_rw_mutex); |
845 | if (error) | |
846 | goto out_end_trans; | |
847 | } | |
848 | } | |
849 | ||
850 | ip->i_di.di_size = size; | |
4bd91ba1 | 851 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
b3b94faa DT |
852 | |
853 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
854 | if (error) | |
855 | goto out_end_trans; | |
856 | ||
d4e9c4c3 | 857 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 858 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
859 | brelse(dibh); |
860 | ||
a91ea69f | 861 | out_end_trans: |
b3b94faa | 862 | gfs2_trans_end(sdp); |
a91ea69f | 863 | out_ipres: |
b3b94faa | 864 | gfs2_inplace_release(ip); |
a91ea69f | 865 | out_gunlock_q: |
b3b94faa | 866 | gfs2_quota_unlock(ip); |
a91ea69f | 867 | out: |
b3b94faa | 868 | gfs2_alloc_put(ip); |
b3b94faa DT |
869 | return error; |
870 | } | |
871 | ||
ba7f7290 SW |
872 | |
873 | /** | |
874 | * gfs2_block_truncate_page - Deal with zeroing out data for truncate | |
875 | * | |
876 | * This is partly borrowed from ext3. | |
877 | */ | |
878 | static int gfs2_block_truncate_page(struct address_space *mapping) | |
879 | { | |
880 | struct inode *inode = mapping->host; | |
881 | struct gfs2_inode *ip = GFS2_I(inode); | |
882 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
883 | loff_t from = inode->i_size; | |
884 | unsigned long index = from >> PAGE_CACHE_SHIFT; | |
885 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
886 | unsigned blocksize, iblock, length, pos; | |
887 | struct buffer_head *bh; | |
888 | struct page *page; | |
ba7f7290 SW |
889 | int err; |
890 | ||
891 | page = grab_cache_page(mapping, index); | |
892 | if (!page) | |
893 | return 0; | |
894 | ||
895 | blocksize = inode->i_sb->s_blocksize; | |
896 | length = blocksize - (offset & (blocksize - 1)); | |
897 | iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); | |
898 | ||
899 | if (!page_has_buffers(page)) | |
900 | create_empty_buffers(page, blocksize, 0); | |
901 | ||
902 | /* Find the buffer that contains "offset" */ | |
903 | bh = page_buffers(page); | |
904 | pos = blocksize; | |
905 | while (offset >= pos) { | |
906 | bh = bh->b_this_page; | |
907 | iblock++; | |
908 | pos += blocksize; | |
909 | } | |
910 | ||
911 | err = 0; | |
912 | ||
913 | if (!buffer_mapped(bh)) { | |
914 | gfs2_get_block(inode, iblock, bh, 0); | |
915 | /* unmapped? It's a hole - nothing to do */ | |
916 | if (!buffer_mapped(bh)) | |
917 | goto unlock; | |
918 | } | |
919 | ||
920 | /* Ok, it's mapped. Make sure it's up-to-date */ | |
921 | if (PageUptodate(page)) | |
922 | set_buffer_uptodate(bh); | |
923 | ||
924 | if (!buffer_uptodate(bh)) { | |
925 | err = -EIO; | |
926 | ll_rw_block(READ, 1, &bh); | |
927 | wait_on_buffer(bh); | |
928 | /* Uhhuh. Read error. Complain and punt. */ | |
929 | if (!buffer_uptodate(bh)) | |
930 | goto unlock; | |
1875f2f3 | 931 | err = 0; |
ba7f7290 SW |
932 | } |
933 | ||
934 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) | |
935 | gfs2_trans_add_bh(ip->i_gl, bh, 0); | |
936 | ||
0507ecf5 | 937 | zero_user_page(page, offset, length, KM_USER0); |
ba7f7290 SW |
938 | |
939 | unlock: | |
940 | unlock_page(page); | |
941 | page_cache_release(page); | |
942 | return err; | |
943 | } | |
944 | ||
cd915493 | 945 | static int trunc_start(struct gfs2_inode *ip, u64 size) |
b3b94faa | 946 | { |
feaa7bba | 947 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
948 | struct buffer_head *dibh; |
949 | int journaled = gfs2_is_jdata(ip); | |
950 | int error; | |
951 | ||
952 | error = gfs2_trans_begin(sdp, | |
c5392124 | 953 | RES_DINODE + (journaled ? RES_JDATA : 0), 0); |
b3b94faa DT |
954 | if (error) |
955 | return error; | |
956 | ||
957 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
958 | if (error) | |
959 | goto out; | |
960 | ||
961 | if (gfs2_is_stuffed(ip)) { | |
962 | ip->i_di.di_size = size; | |
4bd91ba1 | 963 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
d4e9c4c3 | 964 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 965 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
966 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + size); |
967 | error = 1; | |
968 | ||
969 | } else { | |
cd915493 | 970 | if (size & (u64)(sdp->sd_sb.sb_bsize - 1)) |
feaa7bba | 971 | error = gfs2_block_truncate_page(ip->i_inode.i_mapping); |
b3b94faa DT |
972 | |
973 | if (!error) { | |
974 | ip->i_di.di_size = size; | |
4bd91ba1 | 975 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
b3b94faa | 976 | ip->i_di.di_flags |= GFS2_DIF_TRUNC_IN_PROG; |
d4e9c4c3 | 977 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 978 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
979 | } |
980 | } | |
981 | ||
982 | brelse(dibh); | |
983 | ||
a91ea69f | 984 | out: |
b3b94faa | 985 | gfs2_trans_end(sdp); |
b3b94faa DT |
986 | return error; |
987 | } | |
988 | ||
cd915493 | 989 | static int trunc_dealloc(struct gfs2_inode *ip, u64 size) |
b3b94faa DT |
990 | { |
991 | unsigned int height = ip->i_di.di_height; | |
cd915493 | 992 | u64 lblock; |
b3b94faa DT |
993 | struct metapath mp; |
994 | int error; | |
995 | ||
996 | if (!size) | |
997 | lblock = 0; | |
18ec7d5c | 998 | else |
feaa7bba | 999 | lblock = (size - 1) >> GFS2_SB(&ip->i_inode)->sd_sb.sb_bsize_shift; |
b3b94faa DT |
1000 | |
1001 | find_metapath(ip, lblock, &mp); | |
1002 | gfs2_alloc_get(ip); | |
1003 | ||
1004 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
1005 | if (error) | |
1006 | goto out; | |
1007 | ||
1008 | while (height--) { | |
1009 | struct strip_mine sm; | |
1010 | sm.sm_first = !!size; | |
1011 | sm.sm_height = height; | |
1012 | ||
1013 | error = recursive_scan(ip, NULL, &mp, 0, 0, 1, do_strip, &sm); | |
1014 | if (error) | |
1015 | break; | |
1016 | } | |
1017 | ||
1018 | gfs2_quota_unhold(ip); | |
1019 | ||
a91ea69f | 1020 | out: |
b3b94faa DT |
1021 | gfs2_alloc_put(ip); |
1022 | return error; | |
1023 | } | |
1024 | ||
1025 | static int trunc_end(struct gfs2_inode *ip) | |
1026 | { | |
feaa7bba | 1027 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
1028 | struct buffer_head *dibh; |
1029 | int error; | |
1030 | ||
1031 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1032 | if (error) | |
1033 | return error; | |
1034 | ||
1035 | down_write(&ip->i_rw_mutex); | |
1036 | ||
1037 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1038 | if (error) | |
1039 | goto out; | |
1040 | ||
1041 | if (!ip->i_di.di_size) { | |
1042 | ip->i_di.di_height = 0; | |
1043 | ip->i_di.di_goal_meta = | |
1044 | ip->i_di.di_goal_data = | |
dbb7cae2 | 1045 | ip->i_no_addr; |
b3b94faa DT |
1046 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
1047 | } | |
4bd91ba1 | 1048 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
b3b94faa DT |
1049 | ip->i_di.di_flags &= ~GFS2_DIF_TRUNC_IN_PROG; |
1050 | ||
d4e9c4c3 | 1051 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 1052 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1053 | brelse(dibh); |
1054 | ||
a91ea69f | 1055 | out: |
b3b94faa | 1056 | up_write(&ip->i_rw_mutex); |
b3b94faa | 1057 | gfs2_trans_end(sdp); |
b3b94faa DT |
1058 | return error; |
1059 | } | |
1060 | ||
1061 | /** | |
1062 | * do_shrink - make a file smaller | |
1063 | * @ip: the inode | |
1064 | * @size: the size to make the file | |
1065 | * @truncator: function to truncate the last partial block | |
1066 | * | |
1067 | * Called with an exclusive lock on @ip. | |
1068 | * | |
1069 | * Returns: errno | |
1070 | */ | |
1071 | ||
cd915493 | 1072 | static int do_shrink(struct gfs2_inode *ip, u64 size) |
b3b94faa DT |
1073 | { |
1074 | int error; | |
1075 | ||
aa6a85a9 | 1076 | error = trunc_start(ip, size); |
b3b94faa DT |
1077 | if (error < 0) |
1078 | return error; | |
1079 | if (error > 0) | |
1080 | return 0; | |
1081 | ||
1082 | error = trunc_dealloc(ip, size); | |
1083 | if (!error) | |
1084 | error = trunc_end(ip); | |
1085 | ||
1086 | return error; | |
1087 | } | |
1088 | ||
a13b8c5f WC |
1089 | static int do_touch(struct gfs2_inode *ip, u64 size) |
1090 | { | |
1091 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); | |
1092 | struct buffer_head *dibh; | |
1093 | int error; | |
1094 | ||
1095 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1096 | if (error) | |
1097 | return error; | |
1098 | ||
1099 | down_write(&ip->i_rw_mutex); | |
1100 | ||
1101 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1102 | if (error) | |
1103 | goto do_touch_out; | |
1104 | ||
1105 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; | |
1106 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
1107 | gfs2_dinode_out(ip, dibh->b_data); | |
1108 | brelse(dibh); | |
1109 | ||
1110 | do_touch_out: | |
1111 | up_write(&ip->i_rw_mutex); | |
1112 | gfs2_trans_end(sdp); | |
1113 | return error; | |
1114 | } | |
1115 | ||
b3b94faa | 1116 | /** |
666a2c53 | 1117 | * gfs2_truncatei - make a file a given size |
b3b94faa DT |
1118 | * @ip: the inode |
1119 | * @size: the size to make the file | |
1120 | * @truncator: function to truncate the last partial block | |
1121 | * | |
1122 | * The file size can grow, shrink, or stay the same size. | |
1123 | * | |
1124 | * Returns: errno | |
1125 | */ | |
1126 | ||
cd915493 | 1127 | int gfs2_truncatei(struct gfs2_inode *ip, u64 size) |
b3b94faa DT |
1128 | { |
1129 | int error; | |
1130 | ||
b60623c2 | 1131 | if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), S_ISREG(ip->i_inode.i_mode))) |
b3b94faa DT |
1132 | return -EINVAL; |
1133 | ||
1134 | if (size > ip->i_di.di_size) | |
1135 | error = do_grow(ip, size); | |
a13b8c5f | 1136 | else if (size < ip->i_di.di_size) |
aa6a85a9 | 1137 | error = do_shrink(ip, size); |
a13b8c5f WC |
1138 | else |
1139 | /* update time stamps */ | |
1140 | error = do_touch(ip, size); | |
b3b94faa DT |
1141 | |
1142 | return error; | |
1143 | } | |
1144 | ||
1145 | int gfs2_truncatei_resume(struct gfs2_inode *ip) | |
1146 | { | |
1147 | int error; | |
1148 | error = trunc_dealloc(ip, ip->i_di.di_size); | |
1149 | if (!error) | |
1150 | error = trunc_end(ip); | |
1151 | return error; | |
1152 | } | |
1153 | ||
1154 | int gfs2_file_dealloc(struct gfs2_inode *ip) | |
1155 | { | |
1156 | return trunc_dealloc(ip, 0); | |
1157 | } | |
1158 | ||
1159 | /** | |
1160 | * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file | |
1161 | * @ip: the file | |
1162 | * @len: the number of bytes to be written to the file | |
1163 | * @data_blocks: returns the number of data blocks required | |
1164 | * @ind_blocks: returns the number of indirect blocks required | |
1165 | * | |
1166 | */ | |
1167 | ||
1168 | void gfs2_write_calc_reserv(struct gfs2_inode *ip, unsigned int len, | |
1169 | unsigned int *data_blocks, unsigned int *ind_blocks) | |
1170 | { | |
feaa7bba | 1171 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
1172 | unsigned int tmp; |
1173 | ||
18ec7d5c | 1174 | if (gfs2_is_dir(ip)) { |
5c676f6d | 1175 | *data_blocks = DIV_ROUND_UP(len, sdp->sd_jbsize) + 2; |
b3b94faa DT |
1176 | *ind_blocks = 3 * (sdp->sd_max_jheight - 1); |
1177 | } else { | |
1178 | *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3; | |
1179 | *ind_blocks = 3 * (sdp->sd_max_height - 1); | |
1180 | } | |
1181 | ||
1182 | for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) { | |
5c676f6d | 1183 | tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); |
b3b94faa DT |
1184 | *ind_blocks += tmp; |
1185 | } | |
1186 | } | |
1187 | ||
1188 | /** | |
1189 | * gfs2_write_alloc_required - figure out if a write will require an allocation | |
1190 | * @ip: the file being written to | |
1191 | * @offset: the offset to write to | |
1192 | * @len: the number of bytes being written | |
1193 | * @alloc_required: set to 1 if an alloc is required, 0 otherwise | |
1194 | * | |
1195 | * Returns: errno | |
1196 | */ | |
1197 | ||
cd915493 | 1198 | int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset, |
b3b94faa DT |
1199 | unsigned int len, int *alloc_required) |
1200 | { | |
feaa7bba | 1201 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
cd915493 SW |
1202 | u64 lblock, lblock_stop, dblock; |
1203 | u32 extlen; | |
b3b94faa DT |
1204 | int new = 0; |
1205 | int error = 0; | |
1206 | ||
1207 | *alloc_required = 0; | |
1208 | ||
1209 | if (!len) | |
1210 | return 0; | |
1211 | ||
1212 | if (gfs2_is_stuffed(ip)) { | |
1213 | if (offset + len > | |
1214 | sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) | |
1215 | *alloc_required = 1; | |
1216 | return 0; | |
1217 | } | |
1218 | ||
18ec7d5c | 1219 | if (gfs2_is_dir(ip)) { |
b3b94faa DT |
1220 | unsigned int bsize = sdp->sd_jbsize; |
1221 | lblock = offset; | |
1222 | do_div(lblock, bsize); | |
1223 | lblock_stop = offset + len + bsize - 1; | |
1224 | do_div(lblock_stop, bsize); | |
1225 | } else { | |
1226 | unsigned int shift = sdp->sd_sb.sb_bsize_shift; | |
1227 | lblock = offset >> shift; | |
1228 | lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift; | |
1229 | } | |
1230 | ||
1231 | for (; lblock < lblock_stop; lblock += extlen) { | |
feaa7bba | 1232 | error = gfs2_extent_map(&ip->i_inode, lblock, &new, &dblock, &extlen); |
b3b94faa DT |
1233 | if (error) |
1234 | return error; | |
1235 | ||
1236 | if (!dblock) { | |
1237 | *alloc_required = 1; | |
1238 | return 0; | |
1239 | } | |
1240 | } | |
1241 | ||
1242 | return 0; | |
1243 | } | |
1244 |