Commit | Line | Data |
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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
4 | * |
5 | * This copyrighted material is made available to anyone wishing to use, | |
6 | * modify, copy, or redistribute it subject to the terms and conditions | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
8 | */ |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/completion.h> | |
14 | #include <linux/buffer_head.h> | |
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> |
7d308590 | 22 | #include <linux/lm_interface.h> |
b3b94faa DT |
23 | |
24 | #include "gfs2.h" | |
5c676f6d | 25 | #include "incore.h" |
b3b94faa DT |
26 | #include "glock.h" |
27 | #include "glops.h" | |
28 | #include "inode.h" | |
29 | #include "log.h" | |
30 | #include "lops.h" | |
31 | #include "meta_io.h" | |
32 | #include "rgrp.h" | |
33 | #include "trans.h" | |
5c676f6d | 34 | #include "util.h" |
4340fe62 | 35 | #include "ops_address.h" |
b3b94faa | 36 | |
b3b94faa DT |
37 | static int aspace_get_block(struct inode *inode, sector_t lblock, |
38 | struct buffer_head *bh_result, int create) | |
39 | { | |
5c676f6d | 40 | gfs2_assert_warn(inode->i_sb->s_fs_info, 0); |
b3b94faa DT |
41 | return -EOPNOTSUPP; |
42 | } | |
43 | ||
44 | static int gfs2_aspace_writepage(struct page *page, | |
45 | struct writeback_control *wbc) | |
46 | { | |
47 | return block_write_full_page(page, aspace_get_block, wbc); | |
48 | } | |
49 | ||
66de045d | 50 | static const struct address_space_operations aspace_aops = { |
b3b94faa | 51 | .writepage = gfs2_aspace_writepage, |
4340fe62 | 52 | .releasepage = gfs2_releasepage, |
52d4c74b | 53 | .sync_page = block_sync_page, |
b3b94faa DT |
54 | }; |
55 | ||
56 | /** | |
57 | * gfs2_aspace_get - Create and initialize a struct inode structure | |
58 | * @sdp: the filesystem the aspace is in | |
59 | * | |
60 | * Right now a struct inode is just a struct inode. Maybe Linux | |
61 | * will supply a more lightweight address space construct (that works) | |
62 | * in the future. | |
63 | * | |
64 | * Make sure pages/buffers in this aspace aren't in high memory. | |
65 | * | |
66 | * Returns: the aspace | |
67 | */ | |
68 | ||
69 | struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp) | |
70 | { | |
71 | struct inode *aspace; | |
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; | |
bba9dfd8 | 78 | aspace->i_private = NULL; |
b3b94faa DT |
79 | insert_inode_hash(aspace); |
80 | } | |
b3b94faa DT |
81 | return aspace; |
82 | } | |
83 | ||
84 | void gfs2_aspace_put(struct inode *aspace) | |
85 | { | |
86 | remove_inode_hash(aspace); | |
87 | iput(aspace); | |
88 | } | |
89 | ||
b3b94faa DT |
90 | /** |
91 | * gfs2_meta_inval - Invalidate all buffers associated with a glock | |
92 | * @gl: the glock | |
93 | * | |
94 | */ | |
95 | ||
96 | void gfs2_meta_inval(struct gfs2_glock *gl) | |
97 | { | |
98 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
99 | struct inode *aspace = gl->gl_aspace; | |
100 | struct address_space *mapping = gl->gl_aspace->i_mapping; | |
101 | ||
102 | gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count)); | |
103 | ||
104 | atomic_inc(&aspace->i_writecount); | |
105 | truncate_inode_pages(mapping, 0); | |
106 | atomic_dec(&aspace->i_writecount); | |
107 | ||
108 | gfs2_assert_withdraw(sdp, !mapping->nrpages); | |
109 | } | |
110 | ||
111 | /** | |
112 | * gfs2_meta_sync - Sync all buffers associated with a glock | |
113 | * @gl: The glock | |
b3b94faa DT |
114 | * |
115 | */ | |
116 | ||
7276b3b0 | 117 | void gfs2_meta_sync(struct gfs2_glock *gl) |
b3b94faa DT |
118 | { |
119 | struct address_space *mapping = gl->gl_aspace->i_mapping; | |
7276b3b0 | 120 | int error; |
b3b94faa | 121 | |
7276b3b0 SW |
122 | filemap_fdatawrite(mapping); |
123 | error = filemap_fdatawait(mapping); | |
b3b94faa DT |
124 | |
125 | if (error) | |
126 | gfs2_io_error(gl->gl_sbd); | |
127 | } | |
128 | ||
129 | /** | |
130 | * getbuf - Get a buffer with a given address space | |
cb4c0313 | 131 | * @gl: the glock |
b3b94faa DT |
132 | * @blkno: the block number (filesystem scope) |
133 | * @create: 1 if the buffer should be created | |
134 | * | |
135 | * Returns: the buffer | |
136 | */ | |
137 | ||
cb4c0313 | 138 | static struct buffer_head *getbuf(struct gfs2_glock *gl, u64 blkno, int create) |
b3b94faa | 139 | { |
cb4c0313 SW |
140 | struct address_space *mapping = gl->gl_aspace->i_mapping; |
141 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
b3b94faa DT |
142 | struct page *page; |
143 | struct buffer_head *bh; | |
144 | unsigned int shift; | |
145 | unsigned long index; | |
146 | unsigned int bufnum; | |
147 | ||
148 | shift = PAGE_CACHE_SHIFT - sdp->sd_sb.sb_bsize_shift; | |
149 | index = blkno >> shift; /* convert block to page */ | |
150 | bufnum = blkno - (index << shift); /* block buf index within page */ | |
151 | ||
152 | if (create) { | |
153 | for (;;) { | |
cb4c0313 | 154 | page = grab_cache_page(mapping, index); |
b3b94faa DT |
155 | if (page) |
156 | break; | |
157 | yield(); | |
158 | } | |
159 | } else { | |
cb4c0313 | 160 | page = find_lock_page(mapping, index); |
b3b94faa DT |
161 | if (!page) |
162 | return NULL; | |
163 | } | |
164 | ||
165 | if (!page_has_buffers(page)) | |
166 | create_empty_buffers(page, sdp->sd_sb.sb_bsize, 0); | |
167 | ||
168 | /* Locate header for our buffer within our page */ | |
169 | for (bh = page_buffers(page); bufnum--; bh = bh->b_this_page) | |
170 | /* Do nothing */; | |
171 | get_bh(bh); | |
172 | ||
173 | if (!buffer_mapped(bh)) | |
174 | map_bh(bh, sdp->sd_vfs, blkno); | |
175 | ||
176 | unlock_page(page); | |
177 | mark_page_accessed(page); | |
178 | page_cache_release(page); | |
179 | ||
180 | return bh; | |
181 | } | |
182 | ||
183 | static void meta_prep_new(struct buffer_head *bh) | |
184 | { | |
185 | struct gfs2_meta_header *mh = (struct gfs2_meta_header *)bh->b_data; | |
186 | ||
187 | lock_buffer(bh); | |
188 | clear_buffer_dirty(bh); | |
189 | set_buffer_uptodate(bh); | |
190 | unlock_buffer(bh); | |
191 | ||
192 | mh->mh_magic = cpu_to_be32(GFS2_MAGIC); | |
193 | } | |
194 | ||
195 | /** | |
196 | * gfs2_meta_new - Get a block | |
197 | * @gl: The glock associated with this block | |
198 | * @blkno: The block number | |
199 | * | |
200 | * Returns: The buffer | |
201 | */ | |
202 | ||
cd915493 | 203 | struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno) |
b3b94faa DT |
204 | { |
205 | struct buffer_head *bh; | |
cb4c0313 | 206 | bh = getbuf(gl, blkno, CREATE); |
b3b94faa DT |
207 | meta_prep_new(bh); |
208 | return bh; | |
209 | } | |
210 | ||
211 | /** | |
212 | * gfs2_meta_read - Read a block from disk | |
213 | * @gl: The glock covering the block | |
214 | * @blkno: The block number | |
7276b3b0 | 215 | * @flags: flags |
b3b94faa DT |
216 | * @bhp: the place where the buffer is returned (NULL on failure) |
217 | * | |
218 | * Returns: errno | |
219 | */ | |
220 | ||
cd915493 | 221 | int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags, |
b3b94faa DT |
222 | struct buffer_head **bhp) |
223 | { | |
cb4c0313 | 224 | *bhp = getbuf(gl, blkno, CREATE); |
7276b3b0 | 225 | if (!buffer_uptodate(*bhp)) |
2e565bb6 | 226 | ll_rw_block(READ_META, 1, bhp); |
7276b3b0 SW |
227 | if (flags & DIO_WAIT) { |
228 | int error = gfs2_meta_wait(gl->gl_sbd, *bhp); | |
229 | if (error) { | |
230 | brelse(*bhp); | |
231 | return error; | |
232 | } | |
233 | } | |
b3b94faa | 234 | |
7276b3b0 | 235 | return 0; |
b3b94faa DT |
236 | } |
237 | ||
238 | /** | |
7276b3b0 | 239 | * gfs2_meta_wait - Reread a block from disk |
b3b94faa | 240 | * @sdp: the filesystem |
7276b3b0 | 241 | * @bh: The block to wait for |
b3b94faa DT |
242 | * |
243 | * Returns: errno | |
244 | */ | |
245 | ||
7276b3b0 | 246 | int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh) |
b3b94faa DT |
247 | { |
248 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) | |
249 | return -EIO; | |
250 | ||
7276b3b0 | 251 | wait_on_buffer(bh); |
b3b94faa | 252 | |
7276b3b0 SW |
253 | if (!buffer_uptodate(bh)) { |
254 | struct gfs2_trans *tr = current->journal_info; | |
255 | if (tr && tr->tr_touched) | |
256 | gfs2_io_error_bh(sdp, bh); | |
257 | return -EIO; | |
b3b94faa | 258 | } |
7276b3b0 SW |
259 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
260 | return -EIO; | |
b3b94faa DT |
261 | |
262 | return 0; | |
263 | } | |
264 | ||
265 | /** | |
586dfdaa | 266 | * gfs2_attach_bufdata - attach a struct gfs2_bufdata structure to a buffer |
b3b94faa DT |
267 | * @gl: the glock the buffer belongs to |
268 | * @bh: The buffer to be attached to | |
586dfdaa | 269 | * @meta: Flag to indicate whether its metadata or not |
b3b94faa DT |
270 | */ |
271 | ||
568f4c96 SW |
272 | void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh, |
273 | int meta) | |
b3b94faa DT |
274 | { |
275 | struct gfs2_bufdata *bd; | |
276 | ||
18ec7d5c SW |
277 | if (meta) |
278 | lock_page(bh->b_page); | |
b3b94faa | 279 | |
5c676f6d | 280 | if (bh->b_private) { |
18ec7d5c SW |
281 | if (meta) |
282 | unlock_page(bh->b_page); | |
b3b94faa DT |
283 | return; |
284 | } | |
285 | ||
c3762229 | 286 | bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL), |
b3b94faa DT |
287 | bd->bd_bh = bh; |
288 | bd->bd_gl = gl; | |
289 | ||
290 | INIT_LIST_HEAD(&bd->bd_list_tr); | |
82ffa516 | 291 | if (meta) |
586dfdaa | 292 | lops_init_le(&bd->bd_le, &gfs2_buf_lops); |
82ffa516 | 293 | else |
586dfdaa | 294 | lops_init_le(&bd->bd_le, &gfs2_databuf_lops); |
5c676f6d | 295 | bh->b_private = bd; |
b3b94faa | 296 | |
18ec7d5c SW |
297 | if (meta) |
298 | unlock_page(bh->b_page); | |
b3b94faa DT |
299 | } |
300 | ||
16615be1 SW |
301 | void gfs2_remove_from_journal(struct buffer_head *bh, struct gfs2_trans *tr, int meta) |
302 | { | |
303 | struct gfs2_sbd *sdp = GFS2_SB(bh->b_page->mapping->host); | |
304 | struct gfs2_bufdata *bd = bh->b_private; | |
305 | if (test_clear_buffer_pinned(bh)) { | |
306 | list_del_init(&bd->bd_le.le_list); | |
307 | if (meta) { | |
308 | gfs2_assert_warn(sdp, sdp->sd_log_num_buf); | |
309 | sdp->sd_log_num_buf--; | |
310 | tr->tr_num_buf_rm++; | |
311 | } else { | |
312 | gfs2_assert_warn(sdp, sdp->sd_log_num_databuf); | |
313 | sdp->sd_log_num_databuf--; | |
314 | tr->tr_num_databuf_rm++; | |
315 | } | |
316 | tr->tr_touched = 1; | |
317 | brelse(bh); | |
318 | } | |
319 | if (bd) { | |
320 | if (bd->bd_ail) { | |
f91a0d3e | 321 | gfs2_remove_from_ail(bd); |
16615be1 SW |
322 | bh->b_private = NULL; |
323 | bd->bd_bh = NULL; | |
324 | bd->bd_blkno = bh->b_blocknr; | |
325 | gfs2_trans_add_revoke(sdp, bd); | |
326 | } | |
327 | } | |
328 | clear_buffer_dirty(bh); | |
329 | clear_buffer_uptodate(bh); | |
330 | } | |
331 | ||
b3b94faa DT |
332 | /** |
333 | * gfs2_meta_wipe - make inode's buffers so they aren't dirty/pinned anymore | |
334 | * @ip: the inode who owns the buffers | |
335 | * @bstart: the first buffer in the run | |
336 | * @blen: the number of buffers in the run | |
337 | * | |
338 | */ | |
339 | ||
cd915493 | 340 | void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen) |
b3b94faa | 341 | { |
feaa7bba | 342 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa DT |
343 | struct buffer_head *bh; |
344 | ||
345 | while (blen) { | |
cb4c0313 | 346 | bh = getbuf(ip->i_gl, bstart, NO_CREATE); |
b3b94faa | 347 | if (bh) { |
1ad38c43 SW |
348 | lock_buffer(bh); |
349 | gfs2_log_lock(sdp); | |
16615be1 | 350 | gfs2_remove_from_journal(bh, current->journal_info, 1); |
1ad38c43 | 351 | gfs2_log_unlock(sdp); |
b3b94faa | 352 | unlock_buffer(bh); |
b3b94faa DT |
353 | brelse(bh); |
354 | } | |
355 | ||
356 | bstart++; | |
357 | blen--; | |
358 | } | |
359 | } | |
360 | ||
b3b94faa DT |
361 | /** |
362 | * gfs2_meta_indirect_buffer - Get a metadata buffer | |
363 | * @ip: The GFS2 inode | |
364 | * @height: The level of this buf in the metadata (indir addr) tree (if any) | |
365 | * @num: The block number (device relative) of the buffer | |
366 | * @new: Non-zero if we may create a new buffer | |
367 | * @bhp: the buffer is returned here | |
368 | * | |
b3b94faa DT |
369 | * Returns: errno |
370 | */ | |
371 | ||
cd915493 | 372 | int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num, |
b3b94faa DT |
373 | int new, struct buffer_head **bhp) |
374 | { | |
7276b3b0 SW |
375 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
376 | struct gfs2_glock *gl = ip->i_gl; | |
f91a0d3e SW |
377 | struct buffer_head *bh; |
378 | int ret = 0; | |
b3b94faa DT |
379 | |
380 | if (new) { | |
f91a0d3e SW |
381 | BUG_ON(height == 0); |
382 | bh = gfs2_meta_new(gl, num); | |
d4e9c4c3 | 383 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa DT |
384 | gfs2_metatype_set(bh, GFS2_METATYPE_IN, GFS2_FORMAT_IN); |
385 | gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); | |
7276b3b0 SW |
386 | } else { |
387 | u32 mtype = height ? GFS2_METATYPE_IN : GFS2_METATYPE_DI; | |
f91a0d3e SW |
388 | ret = gfs2_meta_read(gl, num, DIO_WAIT, &bh); |
389 | if (ret == 0 && gfs2_metatype_check(sdp, bh, mtype)) { | |
390 | brelse(bh); | |
391 | ret = -EIO; | |
7276b3b0 | 392 | } |
b3b94faa | 393 | } |
b3b94faa | 394 | *bhp = bh; |
f91a0d3e | 395 | return ret; |
b3b94faa DT |
396 | } |
397 | ||
398 | /** | |
399 | * gfs2_meta_ra - start readahead on an extent of a file | |
400 | * @gl: the glock the blocks belong to | |
401 | * @dblock: the starting disk block | |
402 | * @extlen: the number of blocks in the extent | |
403 | * | |
7276b3b0 | 404 | * returns: the first buffer in the extent |
b3b94faa DT |
405 | */ |
406 | ||
7276b3b0 | 407 | struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen) |
b3b94faa DT |
408 | { |
409 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
b3b94faa | 410 | struct buffer_head *first_bh, *bh; |
cd915493 | 411 | u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >> |
568f4c96 | 412 | sdp->sd_sb.sb_bsize_shift; |
b3b94faa | 413 | |
7276b3b0 SW |
414 | BUG_ON(!extlen); |
415 | ||
416 | if (max_ra < 1) | |
417 | max_ra = 1; | |
b3b94faa DT |
418 | if (extlen > max_ra) |
419 | extlen = max_ra; | |
420 | ||
cb4c0313 | 421 | first_bh = getbuf(gl, dblock, CREATE); |
b3b94faa DT |
422 | |
423 | if (buffer_uptodate(first_bh)) | |
424 | goto out; | |
7276b3b0 | 425 | if (!buffer_locked(first_bh)) |
2e565bb6 | 426 | ll_rw_block(READ_META, 1, &first_bh); |
b3b94faa DT |
427 | |
428 | dblock++; | |
429 | extlen--; | |
430 | ||
431 | while (extlen) { | |
cb4c0313 | 432 | bh = getbuf(gl, dblock, CREATE); |
b3b94faa | 433 | |
7276b3b0 SW |
434 | if (!buffer_uptodate(bh) && !buffer_locked(bh)) |
435 | ll_rw_block(READA, 1, &bh); | |
436 | brelse(bh); | |
b3b94faa DT |
437 | dblock++; |
438 | extlen--; | |
7276b3b0 SW |
439 | if (!buffer_locked(first_bh) && buffer_uptodate(first_bh)) |
440 | goto out; | |
b3b94faa DT |
441 | } |
442 | ||
7276b3b0 | 443 | wait_on_buffer(first_bh); |
a91ea69f | 444 | out: |
7276b3b0 | 445 | return first_bh; |
b3b94faa DT |
446 | } |
447 |