Commit | Line | Data |
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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
091806ed | 3 | * Copyright (C) 2004-2008 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> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/pagemap.h> | |
17 | #include <linux/writeback.h> | |
18 | #include <linux/swap.h> | |
19 | #include <linux/delay.h> | |
2e565bb6 | 20 | #include <linux/bio.h> |
5c676f6d | 21 | #include <linux/gfs2_ondisk.h> |
b3b94faa DT |
22 | |
23 | #include "gfs2.h" | |
5c676f6d | 24 | #include "incore.h" |
b3b94faa DT |
25 | #include "glock.h" |
26 | #include "glops.h" | |
27 | #include "inode.h" | |
28 | #include "log.h" | |
29 | #include "lops.h" | |
30 | #include "meta_io.h" | |
31 | #include "rgrp.h" | |
32 | #include "trans.h" | |
5c676f6d | 33 | #include "util.h" |
4340fe62 | 34 | #include "ops_address.h" |
b3b94faa | 35 | |
b3b94faa DT |
36 | static int aspace_get_block(struct inode *inode, sector_t lblock, |
37 | struct buffer_head *bh_result, int create) | |
38 | { | |
5c676f6d | 39 | gfs2_assert_warn(inode->i_sb->s_fs_info, 0); |
b3b94faa DT |
40 | return -EOPNOTSUPP; |
41 | } | |
42 | ||
43 | static int gfs2_aspace_writepage(struct page *page, | |
44 | struct writeback_control *wbc) | |
45 | { | |
46 | return block_write_full_page(page, aspace_get_block, wbc); | |
47 | } | |
48 | ||
66de045d | 49 | static const struct address_space_operations aspace_aops = { |
b3b94faa | 50 | .writepage = gfs2_aspace_writepage, |
4340fe62 | 51 | .releasepage = gfs2_releasepage, |
52d4c74b | 52 | .sync_page = block_sync_page, |
b3b94faa DT |
53 | }; |
54 | ||
55 | /** | |
56 | * gfs2_aspace_get - Create and initialize a struct inode structure | |
57 | * @sdp: the filesystem the aspace is in | |
58 | * | |
59 | * Right now a struct inode is just a struct inode. Maybe Linux | |
60 | * will supply a more lightweight address space construct (that works) | |
61 | * in the future. | |
62 | * | |
63 | * Make sure pages/buffers in this aspace aren't in high memory. | |
64 | * | |
65 | * Returns: the aspace | |
66 | */ | |
67 | ||
68 | struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp) | |
69 | { | |
70 | struct inode *aspace; | |
091806ed | 71 | struct gfs2_inode *ip; |
b3b94faa DT |
72 | |
73 | aspace = new_inode(sdp->sd_vfs); | |
74 | if (aspace) { | |
f3bba03f | 75 | mapping_set_gfp_mask(aspace->i_mapping, GFP_NOFS); |
b3b94faa DT |
76 | aspace->i_mapping->a_ops = &aspace_aops; |
77 | aspace->i_size = ~0ULL; | |
091806ed BP |
78 | ip = GFS2_I(aspace); |
79 | clear_bit(GIF_USER, &ip->i_flags); | |
b3b94faa DT |
80 | insert_inode_hash(aspace); |
81 | } | |
b3b94faa DT |
82 | return aspace; |
83 | } | |
84 | ||
85 | void gfs2_aspace_put(struct inode *aspace) | |
86 | { | |
87 | remove_inode_hash(aspace); | |
88 | iput(aspace); | |
89 | } | |
90 | ||
b3b94faa DT |
91 | /** |
92 | * gfs2_meta_sync - Sync all buffers associated with a glock | |
93 | * @gl: The glock | |
b3b94faa DT |
94 | * |
95 | */ | |
96 | ||
7276b3b0 | 97 | void gfs2_meta_sync(struct gfs2_glock *gl) |
b3b94faa DT |
98 | { |
99 | struct address_space *mapping = gl->gl_aspace->i_mapping; | |
7276b3b0 | 100 | int error; |
b3b94faa | 101 | |
7276b3b0 SW |
102 | filemap_fdatawrite(mapping); |
103 | error = filemap_fdatawait(mapping); | |
b3b94faa DT |
104 | |
105 | if (error) | |
106 | gfs2_io_error(gl->gl_sbd); | |
107 | } | |
108 | ||
109 | /** | |
6802e340 | 110 | * gfs2_getbuf - Get a buffer with a given address space |
cb4c0313 | 111 | * @gl: the glock |
b3b94faa DT |
112 | * @blkno: the block number (filesystem scope) |
113 | * @create: 1 if the buffer should be created | |
114 | * | |
115 | * Returns: the buffer | |
116 | */ | |
117 | ||
6802e340 | 118 | struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create) |
b3b94faa | 119 | { |
cb4c0313 SW |
120 | struct address_space *mapping = gl->gl_aspace->i_mapping; |
121 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
b3b94faa DT |
122 | struct page *page; |
123 | struct buffer_head *bh; | |
124 | unsigned int shift; | |
125 | unsigned long index; | |
126 | unsigned int bufnum; | |
127 | ||
128 | shift = PAGE_CACHE_SHIFT - sdp->sd_sb.sb_bsize_shift; | |
129 | index = blkno >> shift; /* convert block to page */ | |
130 | bufnum = blkno - (index << shift); /* block buf index within page */ | |
131 | ||
132 | if (create) { | |
133 | for (;;) { | |
cb4c0313 | 134 | page = grab_cache_page(mapping, index); |
b3b94faa DT |
135 | if (page) |
136 | break; | |
137 | yield(); | |
138 | } | |
139 | } else { | |
cb4c0313 | 140 | page = find_lock_page(mapping, index); |
b3b94faa DT |
141 | if (!page) |
142 | return NULL; | |
143 | } | |
144 | ||
145 | if (!page_has_buffers(page)) | |
146 | create_empty_buffers(page, sdp->sd_sb.sb_bsize, 0); | |
147 | ||
148 | /* Locate header for our buffer within our page */ | |
149 | for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page) | |
150 | /* Do nothing */; | |
151 | get_bh(bh); | |
152 | ||
153 | if (!buffer_mapped(bh)) | |
154 | map_bh(bh, sdp->sd_vfs, blkno); | |
155 | ||
156 | unlock_page(page); | |
157 | mark_page_accessed(page); | |
158 | page_cache_release(page); | |
159 | ||
160 | return bh; | |
161 | } | |
162 | ||
163 | static void meta_prep_new(struct buffer_head *bh) | |
164 | { | |
165 | struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data; | |
166 | ||
167 | lock_buffer(bh); | |
168 | clear_buffer_dirty(bh); | |
169 | set_buffer_uptodate(bh); | |
170 | unlock_buffer(bh); | |
171 | ||
172 | mh->mh_magic = cpu_to_be32(GFS2_MAGIC); | |
173 | } | |
174 | ||
175 | /** | |
176 | * gfs2_meta_new - Get a block | |
177 | * @gl: The glock associated with this block | |
178 | * @blkno: The block number | |
179 | * | |
180 | * Returns: The buffer | |
181 | */ | |
182 | ||
cd915493 | 183 | struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno) |
b3b94faa DT |
184 | { |
185 | struct buffer_head *bh; | |
6802e340 | 186 | bh = gfs2_getbuf(gl, blkno, CREATE); |
b3b94faa DT |
187 | meta_prep_new(bh); |
188 | return bh; | |
189 | } | |
190 | ||
191 | /** | |
192 | * gfs2_meta_read - Read a block from disk | |
193 | * @gl: The glock covering the block | |
194 | * @blkno: The block number | |
7276b3b0 | 195 | * @flags: flags |
b3b94faa DT |
196 | * @bhp: the place where the buffer is returned (NULL on failure) |
197 | * | |
198 | * Returns: errno | |
199 | */ | |
200 | ||
cd915493 | 201 | int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags, |
b3b94faa DT |
202 | struct buffer_head **bhp) |
203 | { | |
6802e340 | 204 | *bhp = gfs2_getbuf(gl, blkno, CREATE); |
15c7cee7 | 205 | if (!buffer_uptodate(*bhp)) { |
2e565bb6 | 206 | ll_rw_block(READ_META, 1, bhp); |
15c7cee7 BP |
207 | if (flags & DIO_WAIT) { |
208 | int error = gfs2_meta_wait(gl->gl_sbd, *bhp); | |
209 | if (error) { | |
210 | brelse(*bhp); | |
211 | return error; | |
212 | } | |
7276b3b0 SW |
213 | } |
214 | } | |
b3b94faa | 215 | |
7276b3b0 | 216 | return 0; |
b3b94faa DT |
217 | } |
218 | ||
219 | /** | |
7276b3b0 | 220 | * gfs2_meta_wait - Reread a block from disk |
b3b94faa | 221 | * @sdp: the filesystem |
7276b3b0 | 222 | * @bh: The block to wait for |
b3b94faa DT |
223 | * |
224 | * Returns: errno | |
225 | */ | |
226 | ||
7276b3b0 | 227 | int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh) |
b3b94faa DT |
228 | { |
229 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
230 | return -EIO; | |
231 | ||
7276b3b0 | 232 | wait_on_buffer(bh); |
b3b94faa | 233 | |
7276b3b0 SW |
234 | if (!buffer_uptodate(bh)) { |
235 | struct gfs2_trans *tr = current->journal_info; | |
236 | if (tr && tr->tr_touched) | |
237 | gfs2_io_error_bh(sdp, bh); | |
238 | return -EIO; | |
b3b94faa | 239 | } |
7276b3b0 SW |
240 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
241 | return -EIO; | |
b3b94faa DT |
242 | |
243 | return 0; | |
244 | } | |
245 | ||
246 | /** | |
586dfdaa | 247 | * gfs2_attach_bufdata - attach a struct gfs2_bufdata structure to a buffer |
b3b94faa DT |
248 | * @gl: the glock the buffer belongs to |
249 | * @bh: The buffer to be attached to | |
586dfdaa | 250 | * @meta: Flag to indicate whether its metadata or not |
b3b94faa DT |
251 | */ |
252 | ||
568f4c96 SW |
253 | void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh, |
254 | int meta) | |
b3b94faa DT |
255 | { |
256 | struct gfs2_bufdata *bd; | |
257 | ||
18ec7d5c SW |
258 | if (meta) |
259 | lock_page(bh->b_page); | |
b3b94faa | 260 | |
5c676f6d | 261 | if (bh->b_private) { |
18ec7d5c SW |
262 | if (meta) |
263 | unlock_page(bh->b_page); | |
b3b94faa DT |
264 | return; |
265 | } | |
266 | ||
3e5cd087 | 267 | bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
268 | bd->bd_bh = bh; |
269 | bd->bd_gl = gl; | |
270 | ||
271 | INIT_LIST_HEAD(&bd->bd_list_tr); | |
82ffa516 | 272 | if (meta) |
586dfdaa | 273 | lops_init_le(&bd->bd_le, &gfs2_buf_lops); |
82ffa516 | 274 | else |
586dfdaa | 275 | lops_init_le(&bd->bd_le, &gfs2_databuf_lops); |
5c676f6d | 276 | bh->b_private = bd; |
b3b94faa | 277 | |
18ec7d5c SW |
278 | if (meta) |
279 | unlock_page(bh->b_page); | |
b3b94faa DT |
280 | } |
281 | ||
16615be1 SW |
282 | void gfs2_remove_from_journal(struct buffer_head *bh, struct gfs2_trans *tr, int meta) |
283 | { | |
284 | struct gfs2_sbd *sdp = GFS2_SB(bh->b_page->mapping->host); | |
285 | struct gfs2_bufdata *bd = bh->b_private; | |
286 | if (test_clear_buffer_pinned(bh)) { | |
287 | list_del_init(&bd->bd_le.le_list); | |
288 | if (meta) { | |
289 | gfs2_assert_warn(sdp, sdp->sd_log_num_buf); | |
290 | sdp->sd_log_num_buf--; | |
291 | tr->tr_num_buf_rm++; | |
292 | } else { | |
293 | gfs2_assert_warn(sdp, sdp->sd_log_num_databuf); | |
294 | sdp->sd_log_num_databuf--; | |
295 | tr->tr_num_databuf_rm++; | |
296 | } | |
297 | tr->tr_touched = 1; | |
298 | brelse(bh); | |
299 | } | |
300 | if (bd) { | |
301 | if (bd->bd_ail) { | |
f91a0d3e | 302 | gfs2_remove_from_ail(bd); |
16615be1 SW |
303 | bh->b_private = NULL; |
304 | bd->bd_bh = NULL; | |
305 | bd->bd_blkno = bh->b_blocknr; | |
306 | gfs2_trans_add_revoke(sdp, bd); | |
307 | } | |
308 | } | |
309 | clear_buffer_dirty(bh); | |
310 | clear_buffer_uptodate(bh); | |
311 | } | |
312 | ||
b3b94faa DT |
313 | /** |
314 | * gfs2_meta_wipe - make inode's buffers so they aren't dirty/pinned anymore | |
315 | * @ip: the inode who owns the buffers | |
316 | * @bstart: the first buffer in the run | |
317 | * @blen: the number of buffers in the run | |
318 | * | |
319 | */ | |
320 | ||
cd915493 | 321 | void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen) |
b3b94faa | 322 | { |
feaa7bba | 323 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
324 | struct buffer_head *bh; |
325 | ||
326 | while (blen) { | |
6802e340 | 327 | bh = gfs2_getbuf(ip->i_gl, bstart, NO_CREATE); |
b3b94faa | 328 | if (bh) { |
1ad38c43 SW |
329 | lock_buffer(bh); |
330 | gfs2_log_lock(sdp); | |
16615be1 | 331 | gfs2_remove_from_journal(bh, current->journal_info, 1); |
1ad38c43 | 332 | gfs2_log_unlock(sdp); |
b3b94faa | 333 | unlock_buffer(bh); |
b3b94faa DT |
334 | brelse(bh); |
335 | } | |
336 | ||
337 | bstart++; | |
338 | blen--; | |
339 | } | |
340 | } | |
341 | ||
b3b94faa DT |
342 | /** |
343 | * gfs2_meta_indirect_buffer - Get a metadata buffer | |
344 | * @ip: The GFS2 inode | |
345 | * @height: The level of this buf in the metadata (indir addr) tree (if any) | |
346 | * @num: The block number (device relative) of the buffer | |
347 | * @new: Non-zero if we may create a new buffer | |
348 | * @bhp: the buffer is returned here | |
349 | * | |
b3b94faa DT |
350 | * Returns: errno |
351 | */ | |
352 | ||
cd915493 | 353 | int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num, |
b3b94faa DT |
354 | int new, struct buffer_head **bhp) |
355 | { | |
7276b3b0 SW |
356 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
357 | struct gfs2_glock *gl = ip->i_gl; | |
f91a0d3e SW |
358 | struct buffer_head *bh; |
359 | int ret = 0; | |
b3b94faa DT |
360 | |
361 | if (new) { | |
f91a0d3e SW |
362 | BUG_ON(height == 0); |
363 | bh = gfs2_meta_new(gl, num); | |
d4e9c4c3 | 364 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
365 | gfs2_metatype_set(bh, GFS2_METATYPE_IN, GFS2_FORMAT_IN); |
366 | gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); | |
7276b3b0 SW |
367 | } else { |
368 | u32 mtype = height ? GFS2_METATYPE_IN : GFS2_METATYPE_DI; | |
f91a0d3e SW |
369 | ret = gfs2_meta_read(gl, num, DIO_WAIT, &bh); |
370 | if (ret == 0 && gfs2_metatype_check(sdp, bh, mtype)) { | |
371 | brelse(bh); | |
372 | ret = -EIO; | |
7276b3b0 | 373 | } |
b3b94faa | 374 | } |
b3b94faa | 375 | *bhp = bh; |
f91a0d3e | 376 | return ret; |
b3b94faa DT |
377 | } |
378 | ||
379 | /** | |
380 | * gfs2_meta_ra - start readahead on an extent of a file | |
381 | * @gl: the glock the blocks belong to | |
382 | * @dblock: the starting disk block | |
383 | * @extlen: the number of blocks in the extent | |
384 | * | |
7276b3b0 | 385 | * returns: the first buffer in the extent |
b3b94faa DT |
386 | */ |
387 | ||
7276b3b0 | 388 | struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen) |
b3b94faa DT |
389 | { |
390 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
b3b94faa | 391 | struct buffer_head *first_bh, *bh; |
cd915493 | 392 | u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >> |
568f4c96 | 393 | sdp->sd_sb.sb_bsize_shift; |
b3b94faa | 394 | |
7276b3b0 SW |
395 | BUG_ON(!extlen); |
396 | ||
397 | if (max_ra < 1) | |
398 | max_ra = 1; | |
b3b94faa DT |
399 | if (extlen > max_ra) |
400 | extlen = max_ra; | |
401 | ||
6802e340 | 402 | first_bh = gfs2_getbuf(gl, dblock, CREATE); |
b3b94faa DT |
403 | |
404 | if (buffer_uptodate(first_bh)) | |
405 | goto out; | |
7276b3b0 | 406 | if (!buffer_locked(first_bh)) |
2e565bb6 | 407 | ll_rw_block(READ_META, 1, &first_bh); |
b3b94faa DT |
408 | |
409 | dblock++; | |
410 | extlen--; | |
411 | ||
412 | while (extlen) { | |
6802e340 | 413 | bh = gfs2_getbuf(gl, dblock, CREATE); |
b3b94faa | 414 | |
7276b3b0 SW |
415 | if (!buffer_uptodate(bh) && !buffer_locked(bh)) |
416 | ll_rw_block(READA, 1, &bh); | |
417 | brelse(bh); | |
b3b94faa DT |
418 | dblock++; |
419 | extlen--; | |
7276b3b0 SW |
420 | if (!buffer_locked(first_bh) && buffer_uptodate(first_bh)) |
421 | goto out; | |
b3b94faa DT |
422 | } |
423 | ||
7276b3b0 | 424 | wait_on_buffer(first_bh); |
a91ea69f | 425 | out: |
7276b3b0 | 426 | return first_bh; |
b3b94faa DT |
427 | } |
428 |