Commit | Line | Data |
---|---|---|
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" |
b3b94faa | 34 | |
4a0f9a32 | 35 | static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wbc) |
b3b94faa | 36 | { |
4a0f9a32 SW |
37 | int err; |
38 | struct buffer_head *bh, *head; | |
39 | int nr_underway = 0; | |
40 | int write_op = (1 << BIO_RW_META) | ((wbc->sync_mode == WB_SYNC_ALL ? | |
41 | WRITE_SYNC_PLUG : WRITE)); | |
b3b94faa | 42 | |
4a0f9a32 SW |
43 | BUG_ON(!PageLocked(page)); |
44 | BUG_ON(!page_has_buffers(page)); | |
45 | ||
46 | head = page_buffers(page); | |
47 | bh = head; | |
48 | ||
49 | do { | |
50 | if (!buffer_mapped(bh)) | |
51 | continue; | |
52 | /* | |
53 | * If it's a fully non-blocking write attempt and we cannot | |
54 | * lock the buffer then redirty the page. Note that this can | |
55 | * potentially cause a busy-wait loop from pdflush and kswapd | |
56 | * activity, but those code paths have their own higher-level | |
57 | * throttling. | |
58 | */ | |
59 | if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) { | |
60 | lock_buffer(bh); | |
61 | } else if (!trylock_buffer(bh)) { | |
62 | redirty_page_for_writepage(wbc, page); | |
63 | continue; | |
64 | } | |
65 | if (test_clear_buffer_dirty(bh)) { | |
66 | mark_buffer_async_write(bh); | |
67 | } else { | |
68 | unlock_buffer(bh); | |
69 | } | |
70 | } while ((bh = bh->b_this_page) != head); | |
71 | ||
72 | /* | |
73 | * The page and its buffers are protected by PageWriteback(), so we can | |
74 | * drop the bh refcounts early. | |
75 | */ | |
76 | BUG_ON(PageWriteback(page)); | |
77 | set_page_writeback(page); | |
78 | ||
79 | do { | |
80 | struct buffer_head *next = bh->b_this_page; | |
81 | if (buffer_async_write(bh)) { | |
82 | submit_bh(write_op, bh); | |
83 | nr_underway++; | |
84 | } | |
85 | bh = next; | |
86 | } while (bh != head); | |
87 | unlock_page(page); | |
88 | ||
89 | err = 0; | |
90 | if (nr_underway == 0) | |
91 | end_page_writeback(page); | |
92 | ||
93 | return err; | |
b3b94faa DT |
94 | } |
95 | ||
009d8518 | 96 | const struct address_space_operations gfs2_meta_aops = { |
b3b94faa | 97 | .writepage = gfs2_aspace_writepage, |
4340fe62 | 98 | .releasepage = gfs2_releasepage, |
52d4c74b | 99 | .sync_page = block_sync_page, |
b3b94faa DT |
100 | }; |
101 | ||
b3b94faa DT |
102 | /** |
103 | * gfs2_meta_sync - Sync all buffers associated with a glock | |
104 | * @gl: The glock | |
b3b94faa DT |
105 | * |
106 | */ | |
107 | ||
7276b3b0 | 108 | void gfs2_meta_sync(struct gfs2_glock *gl) |
b3b94faa | 109 | { |
009d8518 | 110 | struct address_space *mapping = gfs2_glock2aspace(gl); |
7276b3b0 | 111 | int error; |
b3b94faa | 112 | |
7276b3b0 SW |
113 | filemap_fdatawrite(mapping); |
114 | error = filemap_fdatawait(mapping); | |
b3b94faa DT |
115 | |
116 | if (error) | |
117 | gfs2_io_error(gl->gl_sbd); | |
118 | } | |
119 | ||
120 | /** | |
6802e340 | 121 | * gfs2_getbuf - Get a buffer with a given address space |
cb4c0313 | 122 | * @gl: the glock |
b3b94faa DT |
123 | * @blkno: the block number (filesystem scope) |
124 | * @create: 1 if the buffer should be created | |
125 | * | |
126 | * Returns: the buffer | |
127 | */ | |
128 | ||
6802e340 | 129 | struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create) |
b3b94faa | 130 | { |
009d8518 | 131 | struct address_space *mapping = gfs2_glock2aspace(gl); |
cb4c0313 | 132 | struct gfs2_sbd *sdp = gl->gl_sbd; |
b3b94faa DT |
133 | struct page *page; |
134 | struct buffer_head *bh; | |
135 | unsigned int shift; | |
136 | unsigned long index; | |
137 | unsigned int bufnum; | |
138 | ||
139 | shift = PAGE_CACHE_SHIFT - sdp->sd_sb.sb_bsize_shift; | |
140 | index = blkno >> shift; /* convert block to page */ | |
141 | bufnum = blkno - (index << shift); /* block buf index within page */ | |
142 | ||
143 | if (create) { | |
144 | for (;;) { | |
cb4c0313 | 145 | page = grab_cache_page(mapping, index); |
b3b94faa DT |
146 | if (page) |
147 | break; | |
148 | yield(); | |
149 | } | |
150 | } else { | |
cb4c0313 | 151 | page = find_lock_page(mapping, index); |
b3b94faa DT |
152 | if (!page) |
153 | return NULL; | |
154 | } | |
155 | ||
156 | if (!page_has_buffers(page)) | |
157 | create_empty_buffers(page, sdp->sd_sb.sb_bsize, 0); | |
158 | ||
159 | /* Locate header for our buffer within our page */ | |
160 | for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page) | |
161 | /* Do nothing */; | |
162 | get_bh(bh); | |
163 | ||
164 | if (!buffer_mapped(bh)) | |
165 | map_bh(bh, sdp->sd_vfs, blkno); | |
166 | ||
167 | unlock_page(page); | |
168 | mark_page_accessed(page); | |
169 | page_cache_release(page); | |
170 | ||
171 | return bh; | |
172 | } | |
173 | ||
174 | static void meta_prep_new(struct buffer_head *bh) | |
175 | { | |
176 | struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data; | |
177 | ||
178 | lock_buffer(bh); | |
179 | clear_buffer_dirty(bh); | |
180 | set_buffer_uptodate(bh); | |
181 | unlock_buffer(bh); | |
182 | ||
183 | mh->mh_magic = cpu_to_be32(GFS2_MAGIC); | |
184 | } | |
185 | ||
186 | /** | |
187 | * gfs2_meta_new - Get a block | |
188 | * @gl: The glock associated with this block | |
189 | * @blkno: The block number | |
190 | * | |
191 | * Returns: The buffer | |
192 | */ | |
193 | ||
cd915493 | 194 | struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno) |
b3b94faa DT |
195 | { |
196 | struct buffer_head *bh; | |
6802e340 | 197 | bh = gfs2_getbuf(gl, blkno, CREATE); |
b3b94faa DT |
198 | meta_prep_new(bh); |
199 | return bh; | |
200 | } | |
201 | ||
202 | /** | |
203 | * gfs2_meta_read - Read a block from disk | |
204 | * @gl: The glock covering the block | |
205 | * @blkno: The block number | |
7276b3b0 | 206 | * @flags: flags |
b3b94faa DT |
207 | * @bhp: the place where the buffer is returned (NULL on failure) |
208 | * | |
209 | * Returns: errno | |
210 | */ | |
211 | ||
cd915493 | 212 | int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags, |
b3b94faa DT |
213 | struct buffer_head **bhp) |
214 | { | |
c969f58c SW |
215 | struct gfs2_sbd *sdp = gl->gl_sbd; |
216 | struct buffer_head *bh; | |
217 | ||
218 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
219 | return -EIO; | |
220 | ||
221 | *bhp = bh = gfs2_getbuf(gl, blkno, CREATE); | |
222 | ||
223 | lock_buffer(bh); | |
224 | if (buffer_uptodate(bh)) { | |
225 | unlock_buffer(bh); | |
226 | return 0; | |
227 | } | |
228 | bh->b_end_io = end_buffer_read_sync; | |
229 | get_bh(bh); | |
230 | submit_bh(READ_SYNC | (1 << BIO_RW_META), bh); | |
231 | if (!(flags & DIO_WAIT)) | |
232 | return 0; | |
233 | ||
234 | wait_on_buffer(bh); | |
235 | if (unlikely(!buffer_uptodate(bh))) { | |
236 | struct gfs2_trans *tr = current->journal_info; | |
237 | if (tr && tr->tr_touched) | |
238 | gfs2_io_error_bh(sdp, bh); | |
239 | brelse(bh); | |
240 | return -EIO; | |
7276b3b0 | 241 | } |
b3b94faa | 242 | |
7276b3b0 | 243 | return 0; |
b3b94faa DT |
244 | } |
245 | ||
246 | /** | |
7276b3b0 | 247 | * gfs2_meta_wait - Reread a block from disk |
b3b94faa | 248 | * @sdp: the filesystem |
7276b3b0 | 249 | * @bh: The block to wait for |
b3b94faa DT |
250 | * |
251 | * Returns: errno | |
252 | */ | |
253 | ||
7276b3b0 | 254 | int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh) |
b3b94faa DT |
255 | { |
256 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
257 | return -EIO; | |
258 | ||
7276b3b0 | 259 | wait_on_buffer(bh); |
b3b94faa | 260 | |
7276b3b0 SW |
261 | if (!buffer_uptodate(bh)) { |
262 | struct gfs2_trans *tr = current->journal_info; | |
263 | if (tr && tr->tr_touched) | |
264 | gfs2_io_error_bh(sdp, bh); | |
265 | return -EIO; | |
b3b94faa | 266 | } |
7276b3b0 SW |
267 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
268 | return -EIO; | |
b3b94faa DT |
269 | |
270 | return 0; | |
271 | } | |
272 | ||
273 | /** | |
586dfdaa | 274 | * gfs2_attach_bufdata - attach a struct gfs2_bufdata structure to a buffer |
b3b94faa DT |
275 | * @gl: the glock the buffer belongs to |
276 | * @bh: The buffer to be attached to | |
586dfdaa | 277 | * @meta: Flag to indicate whether its metadata or not |
b3b94faa DT |
278 | */ |
279 | ||
568f4c96 SW |
280 | void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh, |
281 | int meta) | |
b3b94faa DT |
282 | { |
283 | struct gfs2_bufdata *bd; | |
284 | ||
18ec7d5c SW |
285 | if (meta) |
286 | lock_page(bh->b_page); | |
b3b94faa | 287 | |
5c676f6d | 288 | if (bh->b_private) { |
18ec7d5c SW |
289 | if (meta) |
290 | unlock_page(bh->b_page); | |
b3b94faa DT |
291 | return; |
292 | } | |
293 | ||
3e5cd087 | 294 | bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
295 | bd->bd_bh = bh; |
296 | bd->bd_gl = gl; | |
297 | ||
298 | INIT_LIST_HEAD(&bd->bd_list_tr); | |
82ffa516 | 299 | if (meta) |
586dfdaa | 300 | lops_init_le(&bd->bd_le, &gfs2_buf_lops); |
82ffa516 | 301 | else |
586dfdaa | 302 | lops_init_le(&bd->bd_le, &gfs2_databuf_lops); |
5c676f6d | 303 | bh->b_private = bd; |
b3b94faa | 304 | |
18ec7d5c SW |
305 | if (meta) |
306 | unlock_page(bh->b_page); | |
b3b94faa DT |
307 | } |
308 | ||
16615be1 SW |
309 | void gfs2_remove_from_journal(struct buffer_head *bh, struct gfs2_trans *tr, int meta) |
310 | { | |
009d8518 SW |
311 | struct address_space *mapping = bh->b_page->mapping; |
312 | struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping); | |
16615be1 | 313 | struct gfs2_bufdata *bd = bh->b_private; |
009d8518 | 314 | |
16615be1 SW |
315 | if (test_clear_buffer_pinned(bh)) { |
316 | list_del_init(&bd->bd_le.le_list); | |
317 | if (meta) { | |
318 | gfs2_assert_warn(sdp, sdp->sd_log_num_buf); | |
319 | sdp->sd_log_num_buf--; | |
320 | tr->tr_num_buf_rm++; | |
321 | } else { | |
322 | gfs2_assert_warn(sdp, sdp->sd_log_num_databuf); | |
323 | sdp->sd_log_num_databuf--; | |
324 | tr->tr_num_databuf_rm++; | |
325 | } | |
326 | tr->tr_touched = 1; | |
327 | brelse(bh); | |
328 | } | |
329 | if (bd) { | |
330 | if (bd->bd_ail) { | |
f91a0d3e | 331 | gfs2_remove_from_ail(bd); |
16615be1 SW |
332 | bh->b_private = NULL; |
333 | bd->bd_bh = NULL; | |
334 | bd->bd_blkno = bh->b_blocknr; | |
335 | gfs2_trans_add_revoke(sdp, bd); | |
336 | } | |
337 | } | |
338 | clear_buffer_dirty(bh); | |
339 | clear_buffer_uptodate(bh); | |
340 | } | |
341 | ||
b3b94faa DT |
342 | /** |
343 | * gfs2_meta_wipe - make inode's buffers so they aren't dirty/pinned anymore | |
344 | * @ip: the inode who owns the buffers | |
345 | * @bstart: the first buffer in the run | |
346 | * @blen: the number of buffers in the run | |
347 | * | |
348 | */ | |
349 | ||
cd915493 | 350 | void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen) |
b3b94faa | 351 | { |
feaa7bba | 352 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
353 | struct buffer_head *bh; |
354 | ||
355 | while (blen) { | |
6802e340 | 356 | bh = gfs2_getbuf(ip->i_gl, bstart, NO_CREATE); |
b3b94faa | 357 | if (bh) { |
1ad38c43 SW |
358 | lock_buffer(bh); |
359 | gfs2_log_lock(sdp); | |
16615be1 | 360 | gfs2_remove_from_journal(bh, current->journal_info, 1); |
1ad38c43 | 361 | gfs2_log_unlock(sdp); |
b3b94faa | 362 | unlock_buffer(bh); |
b3b94faa DT |
363 | brelse(bh); |
364 | } | |
365 | ||
366 | bstart++; | |
367 | blen--; | |
368 | } | |
369 | } | |
370 | ||
b3b94faa DT |
371 | /** |
372 | * gfs2_meta_indirect_buffer - Get a metadata buffer | |
373 | * @ip: The GFS2 inode | |
374 | * @height: The level of this buf in the metadata (indir addr) tree (if any) | |
375 | * @num: The block number (device relative) of the buffer | |
376 | * @new: Non-zero if we may create a new buffer | |
377 | * @bhp: the buffer is returned here | |
378 | * | |
b3b94faa DT |
379 | * Returns: errno |
380 | */ | |
381 | ||
cd915493 | 382 | int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num, |
b3b94faa DT |
383 | int new, struct buffer_head **bhp) |
384 | { | |
7276b3b0 SW |
385 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
386 | struct gfs2_glock *gl = ip->i_gl; | |
f91a0d3e SW |
387 | struct buffer_head *bh; |
388 | int ret = 0; | |
b3b94faa DT |
389 | |
390 | if (new) { | |
f91a0d3e SW |
391 | BUG_ON(height == 0); |
392 | bh = gfs2_meta_new(gl, num); | |
d4e9c4c3 | 393 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
394 | gfs2_metatype_set(bh, GFS2_METATYPE_IN, GFS2_FORMAT_IN); |
395 | gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); | |
7276b3b0 SW |
396 | } else { |
397 | u32 mtype = height ? GFS2_METATYPE_IN : GFS2_METATYPE_DI; | |
f91a0d3e SW |
398 | ret = gfs2_meta_read(gl, num, DIO_WAIT, &bh); |
399 | if (ret == 0 && gfs2_metatype_check(sdp, bh, mtype)) { | |
400 | brelse(bh); | |
401 | ret = -EIO; | |
7276b3b0 | 402 | } |
b3b94faa | 403 | } |
b3b94faa | 404 | *bhp = bh; |
f91a0d3e | 405 | return ret; |
b3b94faa DT |
406 | } |
407 | ||
408 | /** | |
409 | * gfs2_meta_ra - start readahead on an extent of a file | |
410 | * @gl: the glock the blocks belong to | |
411 | * @dblock: the starting disk block | |
412 | * @extlen: the number of blocks in the extent | |
413 | * | |
7276b3b0 | 414 | * returns: the first buffer in the extent |
b3b94faa DT |
415 | */ |
416 | ||
7276b3b0 | 417 | struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen) |
b3b94faa DT |
418 | { |
419 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
b3b94faa | 420 | struct buffer_head *first_bh, *bh; |
cd915493 | 421 | u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >> |
568f4c96 | 422 | sdp->sd_sb.sb_bsize_shift; |
b3b94faa | 423 | |
7276b3b0 SW |
424 | BUG_ON(!extlen); |
425 | ||
426 | if (max_ra < 1) | |
427 | max_ra = 1; | |
b3b94faa DT |
428 | if (extlen > max_ra) |
429 | extlen = max_ra; | |
430 | ||
6802e340 | 431 | first_bh = gfs2_getbuf(gl, dblock, CREATE); |
b3b94faa DT |
432 | |
433 | if (buffer_uptodate(first_bh)) | |
434 | goto out; | |
7276b3b0 | 435 | if (!buffer_locked(first_bh)) |
c969f58c | 436 | ll_rw_block(READ_SYNC | (1 << BIO_RW_META), 1, &first_bh); |
b3b94faa DT |
437 | |
438 | dblock++; | |
439 | extlen--; | |
440 | ||
441 | while (extlen) { | |
6802e340 | 442 | bh = gfs2_getbuf(gl, dblock, CREATE); |
b3b94faa | 443 | |
7276b3b0 SW |
444 | if (!buffer_uptodate(bh) && !buffer_locked(bh)) |
445 | ll_rw_block(READA, 1, &bh); | |
446 | brelse(bh); | |
b3b94faa DT |
447 | dblock++; |
448 | extlen--; | |
7276b3b0 SW |
449 | if (!buffer_locked(first_bh) && buffer_uptodate(first_bh)) |
450 | goto out; | |
b3b94faa DT |
451 | } |
452 | ||
7276b3b0 | 453 | wait_on_buffer(first_bh); |
a91ea69f | 454 | out: |
7276b3b0 | 455 | return first_bh; |
b3b94faa DT |
456 | } |
457 |