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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); | |
75d3b817 | 96 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) |
f25ef0c1 SW |
97 | gfs2_trans_add_bh(ip->i_gl, bh, 0); |
98 | mark_buffer_dirty(bh); | |
99 | ||
100 | if (release) { | |
101 | unlock_page(page); | |
102 | page_cache_release(page); | |
103 | } | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
b3b94faa DT |
108 | /** |
109 | * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big | |
110 | * @ip: The GFS2 inode to unstuff | |
111 | * @unstuffer: the routine that handles unstuffing a non-zero length file | |
112 | * @private: private data for the unstuffer | |
113 | * | |
114 | * This routine unstuffs a dinode and returns it to a "normal" state such | |
115 | * that the height can be grown in the traditional way. | |
116 | * | |
117 | * Returns: errno | |
118 | */ | |
119 | ||
f25ef0c1 | 120 | int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page) |
b3b94faa DT |
121 | { |
122 | struct buffer_head *bh, *dibh; | |
48516ced | 123 | struct gfs2_dinode *di; |
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; | |
907b9bce | 133 | |
b3b94faa DT |
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; | |
48516ced | 144 | gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_meta_header), |
b3b94faa DT |
145 | dibh, sizeof(struct gfs2_dinode)); |
146 | brelse(bh); | |
147 | } else { | |
148 | block = gfs2_alloc_data(ip); | |
149 | ||
f25ef0c1 | 150 | error = gfs2_unstuffer_page(ip, dibh, block, page); |
b3b94faa DT |
151 | if (error) |
152 | goto out_brelse; | |
153 | } | |
154 | } | |
155 | ||
156 | /* Set up the pointer to the new block */ | |
157 | ||
d4e9c4c3 | 158 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
48516ced | 159 | di = (struct gfs2_dinode *)dibh->b_data; |
b3b94faa DT |
160 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
161 | ||
162 | if (ip->i_di.di_size) { | |
48516ced | 163 | *(__be64 *)(di + 1) = cpu_to_be64(block); |
b3b94faa | 164 | ip->i_di.di_blocks++; |
9e2dbdac | 165 | gfs2_set_inode_blocks(&ip->i_inode); |
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; |
b44b84d7 | 233 | __be64 *bp; |
e90c01e1 SW |
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)); | |
b44b84d7 | 258 | bp = (__be64 *)(blocks[n]->b_data + |
e90c01e1 SW |
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; | |
9e2dbdac | 275 | gfs2_set_inode_blocks(&ip->i_inode); |
48516ced SW |
276 | di->di_height = cpu_to_be16(ip->i_di.di_height); |
277 | di->di_blocks = cpu_to_be64(ip->i_di.di_blocks); | |
e90c01e1 SW |
278 | brelse(dibh); |
279 | return error; | |
b3b94faa DT |
280 | } |
281 | ||
282 | /** | |
283 | * find_metapath - Find path through the metadata tree | |
284 | * @ip: The inode pointer | |
285 | * @mp: The metapath to return the result in | |
286 | * @block: The disk block to look up | |
287 | * | |
288 | * This routine returns a struct metapath structure that defines a path | |
289 | * through the metadata of inode "ip" to get to block "block". | |
290 | * | |
291 | * Example: | |
292 | * Given: "ip" is a height 3 file, "offset" is 101342453, and this is a | |
293 | * filesystem with a blocksize of 4096. | |
294 | * | |
295 | * find_metapath() would return a struct metapath structure set to: | |
296 | * mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48, | |
297 | * and mp_list[2] = 165. | |
298 | * | |
299 | * That means that in order to get to the block containing the byte at | |
300 | * offset 101342453, we would load the indirect block pointed to by pointer | |
301 | * 0 in the dinode. We would then load the indirect block pointed to by | |
302 | * pointer 48 in that indirect block. We would then load the data block | |
303 | * pointed to by pointer 165 in that indirect block. | |
304 | * | |
305 | * ---------------------------------------- | |
306 | * | Dinode | | | |
307 | * | | 4| | |
308 | * | |0 1 2 3 4 5 9| | |
309 | * | | 6| | |
310 | * ---------------------------------------- | |
311 | * | | |
312 | * | | |
313 | * V | |
314 | * ---------------------------------------- | |
315 | * | Indirect Block | | |
316 | * | 5| | |
317 | * | 4 4 4 4 4 5 5 1| | |
318 | * |0 5 6 7 8 9 0 1 2| | |
319 | * ---------------------------------------- | |
320 | * | | |
321 | * | | |
322 | * V | |
323 | * ---------------------------------------- | |
324 | * | Indirect Block | | |
325 | * | 1 1 1 1 1 5| | |
326 | * | 6 6 6 6 6 1| | |
327 | * |0 3 4 5 6 7 2| | |
328 | * ---------------------------------------- | |
329 | * | | |
330 | * | | |
331 | * V | |
332 | * ---------------------------------------- | |
333 | * | Data block containing offset | | |
334 | * | 101342453 | | |
335 | * | | | |
336 | * | | | |
337 | * ---------------------------------------- | |
338 | * | |
339 | */ | |
340 | ||
cd915493 | 341 | static void find_metapath(struct gfs2_inode *ip, u64 block, |
568f4c96 | 342 | struct metapath *mp) |
b3b94faa | 343 | { |
feaa7bba | 344 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
cd915493 | 345 | u64 b = block; |
b3b94faa DT |
346 | unsigned int i; |
347 | ||
348 | for (i = ip->i_di.di_height; i--;) | |
c2668711 | 349 | mp->mp_list[i] = do_div(b, sdp->sd_inptrs); |
b3b94faa DT |
350 | |
351 | } | |
352 | ||
353 | /** | |
354 | * metapointer - Return pointer to start of metadata in a buffer | |
355 | * @bh: The buffer | |
356 | * @height: The metadata height (0 = dinode) | |
357 | * @mp: The metapath | |
358 | * | |
359 | * Return a pointer to the block number of the next height of the metadata | |
360 | * tree given a buffer containing the pointer to the current height of the | |
361 | * metadata tree. | |
362 | */ | |
363 | ||
b44b84d7 | 364 | static inline __be64 *metapointer(struct buffer_head *bh, int *boundary, |
fd88de56 | 365 | unsigned int height, const struct metapath *mp) |
b3b94faa DT |
366 | { |
367 | unsigned int head_size = (height > 0) ? | |
368 | sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode); | |
b44b84d7 | 369 | __be64 *ptr; |
fd88de56 | 370 | *boundary = 0; |
b44b84d7 AV |
371 | ptr = ((__be64 *)(bh->b_data + head_size)) + mp->mp_list[height]; |
372 | if (ptr + 1 == (__be64 *)(bh->b_data + bh->b_size)) | |
fd88de56 SW |
373 | *boundary = 1; |
374 | return ptr; | |
b3b94faa DT |
375 | } |
376 | ||
377 | /** | |
378 | * lookup_block - Get the next metadata block in metadata tree | |
379 | * @ip: The GFS2 inode | |
380 | * @bh: Buffer containing the pointers to metadata blocks | |
381 | * @height: The height of the tree (0 = dinode) | |
382 | * @mp: The metapath | |
383 | * @create: Non-zero if we may create a new meatdata block | |
384 | * @new: Used to indicate if we did create a new metadata block | |
385 | * @block: the returned disk block number | |
386 | * | |
387 | * Given a metatree, complete to a particular height, checks to see if the next | |
388 | * height of the tree exists. If not the next height of the tree is created. | |
389 | * The block number of the next height of the metadata tree is returned. | |
390 | * | |
391 | */ | |
392 | ||
fd88de56 SW |
393 | static int lookup_block(struct gfs2_inode *ip, struct buffer_head *bh, |
394 | unsigned int height, struct metapath *mp, int create, | |
cd915493 | 395 | int *new, u64 *block) |
b3b94faa | 396 | { |
fd88de56 | 397 | int boundary; |
b44b84d7 | 398 | __be64 *ptr = metapointer(bh, &boundary, height, mp); |
b3b94faa DT |
399 | |
400 | if (*ptr) { | |
401 | *block = be64_to_cpu(*ptr); | |
fd88de56 | 402 | return boundary; |
b3b94faa DT |
403 | } |
404 | ||
405 | *block = 0; | |
406 | ||
407 | if (!create) | |
fd88de56 | 408 | return 0; |
b3b94faa | 409 | |
fd88de56 | 410 | if (height == ip->i_di.di_height - 1 && !gfs2_is_dir(ip)) |
b3b94faa DT |
411 | *block = gfs2_alloc_data(ip); |
412 | else | |
413 | *block = gfs2_alloc_meta(ip); | |
414 | ||
d4e9c4c3 | 415 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
416 | |
417 | *ptr = cpu_to_be64(*block); | |
418 | ip->i_di.di_blocks++; | |
9e2dbdac | 419 | gfs2_set_inode_blocks(&ip->i_inode); |
b3b94faa DT |
420 | |
421 | *new = 1; | |
fd88de56 | 422 | return 0; |
b3b94faa DT |
423 | } |
424 | ||
4cf1ed81 SW |
425 | static inline void bmap_lock(struct inode *inode, int create) |
426 | { | |
427 | struct gfs2_inode *ip = GFS2_I(inode); | |
428 | if (create) | |
429 | down_write(&ip->i_rw_mutex); | |
430 | else | |
431 | down_read(&ip->i_rw_mutex); | |
432 | } | |
433 | ||
434 | static inline void bmap_unlock(struct inode *inode, int create) | |
435 | { | |
436 | struct gfs2_inode *ip = GFS2_I(inode); | |
437 | if (create) | |
438 | up_write(&ip->i_rw_mutex); | |
439 | else | |
440 | up_read(&ip->i_rw_mutex); | |
441 | } | |
442 | ||
b3b94faa | 443 | /** |
4cf1ed81 | 444 | * gfs2_block_map - Map a block from an inode to a disk block |
fd88de56 | 445 | * @inode: The inode |
b3b94faa | 446 | * @lblock: The logical block number |
4cf1ed81 | 447 | * @bh_map: The bh to be mapped |
b3b94faa DT |
448 | * |
449 | * Find the block number on the current device which corresponds to an | |
450 | * inode's block. If the block had to be created, "new" will be set. | |
451 | * | |
452 | * Returns: errno | |
453 | */ | |
454 | ||
4cf1ed81 SW |
455 | int gfs2_block_map(struct inode *inode, u64 lblock, int create, |
456 | struct buffer_head *bh_map) | |
b3b94faa | 457 | { |
feaa7bba SW |
458 | struct gfs2_inode *ip = GFS2_I(inode); |
459 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
b3b94faa | 460 | struct buffer_head *bh; |
b3b94faa DT |
461 | unsigned int bsize; |
462 | unsigned int height; | |
463 | unsigned int end_of_metadata; | |
464 | unsigned int x; | |
465 | int error = 0; | |
7a6bbacb SW |
466 | int new = 0; |
467 | u64 dblock = 0; | |
468 | int boundary; | |
23591256 | 469 | unsigned int maxlen = bh_map->b_size >> inode->i_blkbits; |
4cf1ed81 SW |
470 | struct metapath mp; |
471 | u64 size; | |
b3b94faa | 472 | |
7276b3b0 SW |
473 | BUG_ON(maxlen == 0); |
474 | ||
b3b94faa | 475 | if (gfs2_assert_warn(sdp, !gfs2_is_stuffed(ip))) |
7a6bbacb | 476 | return 0; |
b3b94faa | 477 | |
4cf1ed81 SW |
478 | bmap_lock(inode, create); |
479 | clear_buffer_mapped(bh_map); | |
480 | clear_buffer_new(bh_map); | |
481 | clear_buffer_boundary(bh_map); | |
75d3b817 | 482 | bsize = gfs2_is_dir(ip) ? sdp->sd_jbsize : sdp->sd_sb.sb_bsize; |
4cf1ed81 SW |
483 | size = (lblock + 1) * bsize; |
484 | ||
485 | if (size > ip->i_di.di_size) { | |
486 | height = calc_tree_height(ip, size); | |
487 | if (ip->i_di.di_height < height) { | |
488 | if (!create) | |
489 | goto out_ok; | |
490 | ||
491 | error = build_height(inode, height); | |
492 | if (error) | |
493 | goto out_fail; | |
494 | } | |
b3b94faa DT |
495 | } |
496 | ||
4cf1ed81 | 497 | find_metapath(ip, lblock, &mp); |
b3b94faa | 498 | end_of_metadata = ip->i_di.di_height - 1; |
b3b94faa DT |
499 | error = gfs2_meta_inode_buffer(ip, &bh); |
500 | if (error) | |
4cf1ed81 | 501 | goto out_fail; |
b3b94faa DT |
502 | |
503 | for (x = 0; x < end_of_metadata; x++) { | |
4cf1ed81 | 504 | lookup_block(ip, bh, x, &mp, create, &new, &dblock); |
b3b94faa | 505 | brelse(bh); |
7a6bbacb | 506 | if (!dblock) |
4cf1ed81 | 507 | goto out_ok; |
b3b94faa | 508 | |
7a6bbacb | 509 | error = gfs2_meta_indirect_buffer(ip, x+1, dblock, new, &bh); |
b3b94faa | 510 | if (error) |
4cf1ed81 | 511 | goto out_fail; |
b3b94faa DT |
512 | } |
513 | ||
4cf1ed81 | 514 | boundary = lookup_block(ip, bh, end_of_metadata, &mp, create, &new, &dblock); |
7a6bbacb SW |
515 | if (dblock) { |
516 | map_bh(bh_map, inode->i_sb, dblock); | |
517 | if (boundary) | |
4cf1ed81 | 518 | set_buffer_boundary(bh_map); |
7a6bbacb SW |
519 | if (new) { |
520 | struct buffer_head *dibh; | |
521 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
522 | if (!error) { | |
523 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
539e5d6b | 524 | gfs2_dinode_out(ip, dibh->b_data); |
7a6bbacb SW |
525 | brelse(dibh); |
526 | } | |
527 | set_buffer_new(bh_map); | |
528 | goto out_brelse; | |
529 | } | |
530 | while(--maxlen && !buffer_boundary(bh_map)) { | |
531 | u64 eblock; | |
532 | ||
4cf1ed81 SW |
533 | mp.mp_list[end_of_metadata]++; |
534 | boundary = lookup_block(ip, bh, end_of_metadata, &mp, 0, &new, &eblock); | |
7a6bbacb SW |
535 | if (eblock != ++dblock) |
536 | break; | |
f3b30912 | 537 | bh_map->b_size += (1 << inode->i_blkbits); |
7a6bbacb SW |
538 | if (boundary) |
539 | set_buffer_boundary(bh_map); | |
b3b94faa DT |
540 | } |
541 | } | |
7a6bbacb SW |
542 | out_brelse: |
543 | brelse(bh); | |
4cf1ed81 SW |
544 | out_ok: |
545 | error = 0; | |
546 | out_fail: | |
fd88de56 | 547 | bmap_unlock(inode, create); |
4cf1ed81 | 548 | return error; |
fd88de56 SW |
549 | } |
550 | ||
551 | int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen) | |
552 | { | |
23591256 | 553 | struct buffer_head bh = { .b_state = 0, .b_blocknr = 0 }; |
7a6bbacb | 554 | int ret; |
fd88de56 SW |
555 | int create = *new; |
556 | ||
557 | BUG_ON(!extlen); | |
558 | BUG_ON(!dblock); | |
559 | BUG_ON(!new); | |
560 | ||
23591256 | 561 | bh.b_size = 1 << (inode->i_blkbits + 5); |
4cf1ed81 | 562 | ret = gfs2_block_map(inode, lblock, create, &bh); |
7a6bbacb SW |
563 | *extlen = bh.b_size >> inode->i_blkbits; |
564 | *dblock = bh.b_blocknr; | |
565 | if (buffer_new(&bh)) | |
566 | *new = 1; | |
567 | else | |
568 | *new = 0; | |
569 | return ret; | |
b3b94faa DT |
570 | } |
571 | ||
572 | /** | |
573 | * recursive_scan - recursively scan through the end of a file | |
574 | * @ip: the inode | |
575 | * @dibh: the dinode buffer | |
576 | * @mp: the path through the metadata to the point to start | |
577 | * @height: the height the recursion is at | |
578 | * @block: the indirect block to look at | |
579 | * @first: 1 if this is the first block | |
580 | * @bc: the call to make for each piece of metadata | |
581 | * @data: data opaque to this function to pass to @bc | |
582 | * | |
583 | * When this is first called @height and @block should be zero and | |
584 | * @first should be 1. | |
585 | * | |
586 | * Returns: errno | |
587 | */ | |
588 | ||
589 | static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh, | |
590 | struct metapath *mp, unsigned int height, | |
cd915493 | 591 | u64 block, int first, block_call_t bc, |
b3b94faa DT |
592 | void *data) |
593 | { | |
feaa7bba | 594 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa | 595 | struct buffer_head *bh = NULL; |
b44b84d7 | 596 | __be64 *top, *bottom; |
cd915493 | 597 | u64 bn; |
b3b94faa DT |
598 | int error; |
599 | int mh_size = sizeof(struct gfs2_meta_header); | |
600 | ||
601 | if (!height) { | |
602 | error = gfs2_meta_inode_buffer(ip, &bh); | |
603 | if (error) | |
604 | return error; | |
605 | dibh = bh; | |
606 | ||
b44b84d7 AV |
607 | top = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + mp->mp_list[0]; |
608 | bottom = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + sdp->sd_diptrs; | |
b3b94faa DT |
609 | } else { |
610 | error = gfs2_meta_indirect_buffer(ip, height, block, 0, &bh); | |
611 | if (error) | |
612 | return error; | |
613 | ||
b44b84d7 | 614 | top = (__be64 *)(bh->b_data + mh_size) + |
c5392124 | 615 | (first ? mp->mp_list[height] : 0); |
b3b94faa | 616 | |
b44b84d7 | 617 | bottom = (__be64 *)(bh->b_data + mh_size) + sdp->sd_inptrs; |
b3b94faa DT |
618 | } |
619 | ||
620 | error = bc(ip, dibh, bh, top, bottom, height, data); | |
621 | if (error) | |
622 | goto out; | |
623 | ||
624 | if (height < ip->i_di.di_height - 1) | |
625 | for (; top < bottom; top++, first = 0) { | |
626 | if (!*top) | |
627 | continue; | |
628 | ||
629 | bn = be64_to_cpu(*top); | |
630 | ||
631 | error = recursive_scan(ip, dibh, mp, height + 1, bn, | |
632 | first, bc, data); | |
633 | if (error) | |
634 | break; | |
635 | } | |
636 | ||
a91ea69f | 637 | out: |
b3b94faa | 638 | brelse(bh); |
b3b94faa DT |
639 | return error; |
640 | } | |
641 | ||
642 | /** | |
643 | * do_strip - Look for a layer a particular layer of the file and strip it off | |
644 | * @ip: the inode | |
645 | * @dibh: the dinode buffer | |
646 | * @bh: A buffer of pointers | |
647 | * @top: The first pointer in the buffer | |
648 | * @bottom: One more than the last pointer | |
649 | * @height: the height this buffer is at | |
650 | * @data: a pointer to a struct strip_mine | |
651 | * | |
652 | * Returns: errno | |
653 | */ | |
654 | ||
655 | static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh, | |
b44b84d7 | 656 | struct buffer_head *bh, __be64 *top, __be64 *bottom, |
b3b94faa DT |
657 | unsigned int height, void *data) |
658 | { | |
feaa7bba SW |
659 | struct strip_mine *sm = data; |
660 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); | |
b3b94faa | 661 | struct gfs2_rgrp_list rlist; |
cd915493 SW |
662 | u64 bn, bstart; |
663 | u32 blen; | |
b44b84d7 | 664 | __be64 *p; |
b3b94faa DT |
665 | unsigned int rg_blocks = 0; |
666 | int metadata; | |
667 | unsigned int revokes = 0; | |
668 | int x; | |
669 | int error; | |
670 | ||
671 | if (!*top) | |
672 | sm->sm_first = 0; | |
673 | ||
674 | if (height != sm->sm_height) | |
675 | return 0; | |
676 | ||
677 | if (sm->sm_first) { | |
678 | top++; | |
679 | sm->sm_first = 0; | |
680 | } | |
681 | ||
18ec7d5c | 682 | metadata = (height != ip->i_di.di_height - 1); |
b3b94faa DT |
683 | if (metadata) |
684 | revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs; | |
685 | ||
686 | error = gfs2_rindex_hold(sdp, &ip->i_alloc.al_ri_gh); | |
687 | if (error) | |
688 | return error; | |
689 | ||
690 | memset(&rlist, 0, sizeof(struct gfs2_rgrp_list)); | |
691 | bstart = 0; | |
692 | blen = 0; | |
693 | ||
694 | for (p = top; p < bottom; p++) { | |
695 | if (!*p) | |
696 | continue; | |
697 | ||
698 | bn = be64_to_cpu(*p); | |
699 | ||
700 | if (bstart + blen == bn) | |
701 | blen++; | |
702 | else { | |
703 | if (bstart) | |
704 | gfs2_rlist_add(sdp, &rlist, bstart); | |
705 | ||
706 | bstart = bn; | |
707 | blen = 1; | |
708 | } | |
709 | } | |
710 | ||
711 | if (bstart) | |
712 | gfs2_rlist_add(sdp, &rlist, bstart); | |
713 | else | |
714 | goto out; /* Nothing to do */ | |
715 | ||
716 | gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, 0); | |
717 | ||
718 | for (x = 0; x < rlist.rl_rgrps; x++) { | |
719 | struct gfs2_rgrpd *rgd; | |
5c676f6d | 720 | rgd = rlist.rl_ghs[x].gh_gl->gl_object; |
b3b94faa DT |
721 | rg_blocks += rgd->rd_ri.ri_length; |
722 | } | |
723 | ||
724 | error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs); | |
725 | if (error) | |
726 | goto out_rlist; | |
727 | ||
728 | error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + | |
729 | RES_INDIRECT + RES_STATFS + RES_QUOTA, | |
730 | revokes); | |
731 | if (error) | |
732 | goto out_rg_gunlock; | |
733 | ||
734 | down_write(&ip->i_rw_mutex); | |
735 | ||
d4e9c4c3 SW |
736 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
737 | gfs2_trans_add_bh(ip->i_gl, bh, 1); | |
b3b94faa DT |
738 | |
739 | bstart = 0; | |
740 | blen = 0; | |
741 | ||
742 | for (p = top; p < bottom; p++) { | |
743 | if (!*p) | |
744 | continue; | |
745 | ||
746 | bn = be64_to_cpu(*p); | |
747 | ||
748 | if (bstart + blen == bn) | |
749 | blen++; | |
750 | else { | |
751 | if (bstart) { | |
752 | if (metadata) | |
753 | gfs2_free_meta(ip, bstart, blen); | |
754 | else | |
755 | gfs2_free_data(ip, bstart, blen); | |
756 | } | |
757 | ||
758 | bstart = bn; | |
759 | blen = 1; | |
760 | } | |
761 | ||
762 | *p = 0; | |
763 | if (!ip->i_di.di_blocks) | |
764 | gfs2_consist_inode(ip); | |
765 | ip->i_di.di_blocks--; | |
9e2dbdac | 766 | gfs2_set_inode_blocks(&ip->i_inode); |
b3b94faa DT |
767 | } |
768 | if (bstart) { | |
769 | if (metadata) | |
770 | gfs2_free_meta(ip, bstart, blen); | |
771 | else | |
772 | gfs2_free_data(ip, bstart, blen); | |
773 | } | |
774 | ||
ddfe0627 | 775 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME_SEC; |
b3b94faa | 776 | |
539e5d6b | 777 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
778 | |
779 | up_write(&ip->i_rw_mutex); | |
780 | ||
781 | gfs2_trans_end(sdp); | |
782 | ||
a91ea69f | 783 | out_rg_gunlock: |
b3b94faa | 784 | gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs); |
a91ea69f | 785 | out_rlist: |
b3b94faa | 786 | gfs2_rlist_free(&rlist); |
a91ea69f | 787 | out: |
b3b94faa | 788 | gfs2_glock_dq_uninit(&ip->i_alloc.al_ri_gh); |
b3b94faa DT |
789 | return error; |
790 | } | |
791 | ||
792 | /** | |
793 | * do_grow - Make a file look bigger than it is | |
794 | * @ip: the inode | |
795 | * @size: the size to set the file to | |
796 | * | |
797 | * Called with an exclusive lock on @ip. | |
798 | * | |
799 | * Returns: errno | |
800 | */ | |
801 | ||
cd915493 | 802 | static int do_grow(struct gfs2_inode *ip, u64 size) |
b3b94faa | 803 | { |
feaa7bba | 804 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
805 | struct gfs2_alloc *al; |
806 | struct buffer_head *dibh; | |
807 | unsigned int h; | |
808 | int error; | |
809 | ||
810 | al = gfs2_alloc_get(ip); | |
811 | ||
812 | error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
813 | if (error) | |
814 | goto out; | |
815 | ||
2933f925 | 816 | error = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid); |
b3b94faa DT |
817 | if (error) |
818 | goto out_gunlock_q; | |
819 | ||
820 | al->al_requested = sdp->sd_max_height + RES_DATA; | |
821 | ||
822 | error = gfs2_inplace_reserve(ip); | |
823 | if (error) | |
824 | goto out_gunlock_q; | |
825 | ||
826 | error = gfs2_trans_begin(sdp, | |
827 | sdp->sd_max_height + al->al_rgd->rd_ri.ri_length + | |
828 | RES_JDATA + RES_DINODE + RES_STATFS + RES_QUOTA, 0); | |
829 | if (error) | |
830 | goto out_ipres; | |
831 | ||
832 | if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { | |
833 | if (gfs2_is_stuffed(ip)) { | |
f25ef0c1 | 834 | error = gfs2_unstuff_dinode(ip, NULL); |
b3b94faa DT |
835 | if (error) |
836 | goto out_end_trans; | |
837 | } | |
838 | ||
839 | h = calc_tree_height(ip, size); | |
840 | if (ip->i_di.di_height < h) { | |
841 | down_write(&ip->i_rw_mutex); | |
feaa7bba | 842 | error = build_height(&ip->i_inode, h); |
b3b94faa DT |
843 | up_write(&ip->i_rw_mutex); |
844 | if (error) | |
845 | goto out_end_trans; | |
846 | } | |
847 | } | |
848 | ||
849 | ip->i_di.di_size = size; | |
ddfe0627 | 850 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME_SEC; |
b3b94faa DT |
851 | |
852 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
853 | if (error) | |
854 | goto out_end_trans; | |
855 | ||
d4e9c4c3 | 856 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 857 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
858 | brelse(dibh); |
859 | ||
a91ea69f | 860 | out_end_trans: |
b3b94faa | 861 | gfs2_trans_end(sdp); |
a91ea69f | 862 | out_ipres: |
b3b94faa | 863 | gfs2_inplace_release(ip); |
a91ea69f | 864 | out_gunlock_q: |
b3b94faa | 865 | gfs2_quota_unlock(ip); |
a91ea69f | 866 | out: |
b3b94faa | 867 | gfs2_alloc_put(ip); |
b3b94faa DT |
868 | return error; |
869 | } | |
870 | ||
ba7f7290 SW |
871 | |
872 | /** | |
873 | * gfs2_block_truncate_page - Deal with zeroing out data for truncate | |
874 | * | |
875 | * This is partly borrowed from ext3. | |
876 | */ | |
877 | static int gfs2_block_truncate_page(struct address_space *mapping) | |
878 | { | |
879 | struct inode *inode = mapping->host; | |
880 | struct gfs2_inode *ip = GFS2_I(inode); | |
881 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
882 | loff_t from = inode->i_size; | |
883 | unsigned long index = from >> PAGE_CACHE_SHIFT; | |
884 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
885 | unsigned blocksize, iblock, length, pos; | |
886 | struct buffer_head *bh; | |
887 | struct page *page; | |
ba7f7290 SW |
888 | int err; |
889 | ||
890 | page = grab_cache_page(mapping, index); | |
891 | if (!page) | |
892 | return 0; | |
893 | ||
894 | blocksize = inode->i_sb->s_blocksize; | |
895 | length = blocksize - (offset & (blocksize - 1)); | |
896 | iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); | |
897 | ||
898 | if (!page_has_buffers(page)) | |
899 | create_empty_buffers(page, blocksize, 0); | |
900 | ||
901 | /* Find the buffer that contains "offset" */ | |
902 | bh = page_buffers(page); | |
903 | pos = blocksize; | |
904 | while (offset >= pos) { | |
905 | bh = bh->b_this_page; | |
906 | iblock++; | |
907 | pos += blocksize; | |
908 | } | |
909 | ||
910 | err = 0; | |
911 | ||
912 | if (!buffer_mapped(bh)) { | |
913 | gfs2_get_block(inode, iblock, bh, 0); | |
914 | /* unmapped? It's a hole - nothing to do */ | |
915 | if (!buffer_mapped(bh)) | |
916 | goto unlock; | |
917 | } | |
918 | ||
919 | /* Ok, it's mapped. Make sure it's up-to-date */ | |
920 | if (PageUptodate(page)) | |
921 | set_buffer_uptodate(bh); | |
922 | ||
923 | if (!buffer_uptodate(bh)) { | |
924 | err = -EIO; | |
925 | ll_rw_block(READ, 1, &bh); | |
926 | wait_on_buffer(bh); | |
927 | /* Uhhuh. Read error. Complain and punt. */ | |
928 | if (!buffer_uptodate(bh)) | |
929 | goto unlock; | |
930 | } | |
931 | ||
932 | if (sdp->sd_args.ar_data == GFS2_DATA_ORDERED || gfs2_is_jdata(ip)) | |
933 | gfs2_trans_add_bh(ip->i_gl, bh, 0); | |
934 | ||
0507ecf5 | 935 | zero_user_page(page, offset, length, KM_USER0); |
ba7f7290 SW |
936 | |
937 | unlock: | |
938 | unlock_page(page); | |
939 | page_cache_release(page); | |
940 | return err; | |
941 | } | |
942 | ||
cd915493 | 943 | static int trunc_start(struct gfs2_inode *ip, u64 size) |
b3b94faa | 944 | { |
feaa7bba | 945 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
946 | struct buffer_head *dibh; |
947 | int journaled = gfs2_is_jdata(ip); | |
948 | int error; | |
949 | ||
950 | error = gfs2_trans_begin(sdp, | |
c5392124 | 951 | RES_DINODE + (journaled ? RES_JDATA : 0), 0); |
b3b94faa DT |
952 | if (error) |
953 | return error; | |
954 | ||
955 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
956 | if (error) | |
957 | goto out; | |
958 | ||
959 | if (gfs2_is_stuffed(ip)) { | |
960 | ip->i_di.di_size = size; | |
ddfe0627 | 961 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME_SEC; |
d4e9c4c3 | 962 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 963 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
964 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + size); |
965 | error = 1; | |
966 | ||
967 | } else { | |
cd915493 | 968 | if (size & (u64)(sdp->sd_sb.sb_bsize - 1)) |
feaa7bba | 969 | error = gfs2_block_truncate_page(ip->i_inode.i_mapping); |
b3b94faa DT |
970 | |
971 | if (!error) { | |
972 | ip->i_di.di_size = size; | |
ddfe0627 | 973 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME_SEC; |
b3b94faa | 974 | ip->i_di.di_flags |= GFS2_DIF_TRUNC_IN_PROG; |
d4e9c4c3 | 975 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 976 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
977 | } |
978 | } | |
979 | ||
980 | brelse(dibh); | |
981 | ||
a91ea69f | 982 | out: |
b3b94faa | 983 | gfs2_trans_end(sdp); |
b3b94faa DT |
984 | return error; |
985 | } | |
986 | ||
cd915493 | 987 | static int trunc_dealloc(struct gfs2_inode *ip, u64 size) |
b3b94faa DT |
988 | { |
989 | unsigned int height = ip->i_di.di_height; | |
cd915493 | 990 | u64 lblock; |
b3b94faa DT |
991 | struct metapath mp; |
992 | int error; | |
993 | ||
994 | if (!size) | |
995 | lblock = 0; | |
18ec7d5c | 996 | else |
feaa7bba | 997 | lblock = (size - 1) >> GFS2_SB(&ip->i_inode)->sd_sb.sb_bsize_shift; |
b3b94faa DT |
998 | |
999 | find_metapath(ip, lblock, &mp); | |
1000 | gfs2_alloc_get(ip); | |
1001 | ||
1002 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
1003 | if (error) | |
1004 | goto out; | |
1005 | ||
1006 | while (height--) { | |
1007 | struct strip_mine sm; | |
1008 | sm.sm_first = !!size; | |
1009 | sm.sm_height = height; | |
1010 | ||
1011 | error = recursive_scan(ip, NULL, &mp, 0, 0, 1, do_strip, &sm); | |
1012 | if (error) | |
1013 | break; | |
1014 | } | |
1015 | ||
1016 | gfs2_quota_unhold(ip); | |
1017 | ||
a91ea69f | 1018 | out: |
b3b94faa DT |
1019 | gfs2_alloc_put(ip); |
1020 | return error; | |
1021 | } | |
1022 | ||
1023 | static int trunc_end(struct gfs2_inode *ip) | |
1024 | { | |
feaa7bba | 1025 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
1026 | struct buffer_head *dibh; |
1027 | int error; | |
1028 | ||
1029 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); | |
1030 | if (error) | |
1031 | return error; | |
1032 | ||
1033 | down_write(&ip->i_rw_mutex); | |
1034 | ||
1035 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1036 | if (error) | |
1037 | goto out; | |
1038 | ||
1039 | if (!ip->i_di.di_size) { | |
1040 | ip->i_di.di_height = 0; | |
1041 | ip->i_di.di_goal_meta = | |
1042 | ip->i_di.di_goal_data = | |
dbb7cae2 | 1043 | ip->i_no_addr; |
b3b94faa DT |
1044 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
1045 | } | |
ddfe0627 | 1046 | ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME_SEC; |
b3b94faa DT |
1047 | ip->i_di.di_flags &= ~GFS2_DIF_TRUNC_IN_PROG; |
1048 | ||
d4e9c4c3 | 1049 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 1050 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1051 | brelse(dibh); |
1052 | ||
a91ea69f | 1053 | out: |
b3b94faa | 1054 | up_write(&ip->i_rw_mutex); |
b3b94faa | 1055 | gfs2_trans_end(sdp); |
b3b94faa DT |
1056 | return error; |
1057 | } | |
1058 | ||
1059 | /** | |
1060 | * do_shrink - make a file smaller | |
1061 | * @ip: the inode | |
1062 | * @size: the size to make the file | |
1063 | * @truncator: function to truncate the last partial block | |
1064 | * | |
1065 | * Called with an exclusive lock on @ip. | |
1066 | * | |
1067 | * Returns: errno | |
1068 | */ | |
1069 | ||
cd915493 | 1070 | static int do_shrink(struct gfs2_inode *ip, u64 size) |
b3b94faa DT |
1071 | { |
1072 | int error; | |
1073 | ||
aa6a85a9 | 1074 | error = trunc_start(ip, size); |
b3b94faa DT |
1075 | if (error < 0) |
1076 | return error; | |
1077 | if (error > 0) | |
1078 | return 0; | |
1079 | ||
1080 | error = trunc_dealloc(ip, size); | |
1081 | if (!error) | |
1082 | error = trunc_end(ip); | |
1083 | ||
1084 | return error; | |
1085 | } | |
1086 | ||
1087 | /** | |
666a2c53 | 1088 | * gfs2_truncatei - make a file a given size |
b3b94faa DT |
1089 | * @ip: the inode |
1090 | * @size: the size to make the file | |
1091 | * @truncator: function to truncate the last partial block | |
1092 | * | |
1093 | * The file size can grow, shrink, or stay the same size. | |
1094 | * | |
1095 | * Returns: errno | |
1096 | */ | |
1097 | ||
cd915493 | 1098 | int gfs2_truncatei(struct gfs2_inode *ip, u64 size) |
b3b94faa DT |
1099 | { |
1100 | int error; | |
1101 | ||
b60623c2 | 1102 | if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), S_ISREG(ip->i_inode.i_mode))) |
b3b94faa DT |
1103 | return -EINVAL; |
1104 | ||
1105 | if (size > ip->i_di.di_size) | |
1106 | error = do_grow(ip, size); | |
1107 | else | |
aa6a85a9 | 1108 | error = do_shrink(ip, size); |
b3b94faa DT |
1109 | |
1110 | return error; | |
1111 | } | |
1112 | ||
1113 | int gfs2_truncatei_resume(struct gfs2_inode *ip) | |
1114 | { | |
1115 | int error; | |
1116 | error = trunc_dealloc(ip, ip->i_di.di_size); | |
1117 | if (!error) | |
1118 | error = trunc_end(ip); | |
1119 | return error; | |
1120 | } | |
1121 | ||
1122 | int gfs2_file_dealloc(struct gfs2_inode *ip) | |
1123 | { | |
1124 | return trunc_dealloc(ip, 0); | |
1125 | } | |
1126 | ||
1127 | /** | |
1128 | * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file | |
1129 | * @ip: the file | |
1130 | * @len: the number of bytes to be written to the file | |
1131 | * @data_blocks: returns the number of data blocks required | |
1132 | * @ind_blocks: returns the number of indirect blocks required | |
1133 | * | |
1134 | */ | |
1135 | ||
1136 | void gfs2_write_calc_reserv(struct gfs2_inode *ip, unsigned int len, | |
1137 | unsigned int *data_blocks, unsigned int *ind_blocks) | |
1138 | { | |
feaa7bba | 1139 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
1140 | unsigned int tmp; |
1141 | ||
18ec7d5c | 1142 | if (gfs2_is_dir(ip)) { |
5c676f6d | 1143 | *data_blocks = DIV_ROUND_UP(len, sdp->sd_jbsize) + 2; |
b3b94faa DT |
1144 | *ind_blocks = 3 * (sdp->sd_max_jheight - 1); |
1145 | } else { | |
1146 | *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3; | |
1147 | *ind_blocks = 3 * (sdp->sd_max_height - 1); | |
1148 | } | |
1149 | ||
1150 | for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) { | |
5c676f6d | 1151 | tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs); |
b3b94faa DT |
1152 | *ind_blocks += tmp; |
1153 | } | |
1154 | } | |
1155 | ||
1156 | /** | |
1157 | * gfs2_write_alloc_required - figure out if a write will require an allocation | |
1158 | * @ip: the file being written to | |
1159 | * @offset: the offset to write to | |
1160 | * @len: the number of bytes being written | |
1161 | * @alloc_required: set to 1 if an alloc is required, 0 otherwise | |
1162 | * | |
1163 | * Returns: errno | |
1164 | */ | |
1165 | ||
cd915493 | 1166 | int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset, |
b3b94faa DT |
1167 | unsigned int len, int *alloc_required) |
1168 | { | |
feaa7bba | 1169 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
cd915493 SW |
1170 | u64 lblock, lblock_stop, dblock; |
1171 | u32 extlen; | |
b3b94faa DT |
1172 | int new = 0; |
1173 | int error = 0; | |
1174 | ||
1175 | *alloc_required = 0; | |
1176 | ||
1177 | if (!len) | |
1178 | return 0; | |
1179 | ||
1180 | if (gfs2_is_stuffed(ip)) { | |
1181 | if (offset + len > | |
1182 | sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) | |
1183 | *alloc_required = 1; | |
1184 | return 0; | |
1185 | } | |
1186 | ||
18ec7d5c | 1187 | if (gfs2_is_dir(ip)) { |
b3b94faa DT |
1188 | unsigned int bsize = sdp->sd_jbsize; |
1189 | lblock = offset; | |
1190 | do_div(lblock, bsize); | |
1191 | lblock_stop = offset + len + bsize - 1; | |
1192 | do_div(lblock_stop, bsize); | |
1193 | } else { | |
1194 | unsigned int shift = sdp->sd_sb.sb_bsize_shift; | |
1195 | lblock = offset >> shift; | |
1196 | lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift; | |
1197 | } | |
1198 | ||
1199 | for (; lblock < lblock_stop; lblock += extlen) { | |
feaa7bba | 1200 | error = gfs2_extent_map(&ip->i_inode, lblock, &new, &dblock, &extlen); |
b3b94faa DT |
1201 | if (error) |
1202 | return error; | |
1203 | ||
1204 | if (!dblock) { | |
1205 | *alloc_required = 1; | |
1206 | return 0; | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | return 0; | |
1211 | } | |
1212 |