blob: 8d6f13256b2634c520543d7b7acb615c0c397d96 [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Bob Peterson091806e2008-04-29 12:35:48 -05003 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
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>
Steven Whitehouse2e565bb2006-10-02 11:38:25 -040020#include <linux/bio.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050021#include <linux/gfs2_ondisk.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000022
23#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050024#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000025#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"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050033#include "util.h"
Steven Whitehouse4340fe62006-07-11 09:46:33 -040034#include "ops_address.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000035
David Teiglandb3b94fa2006-01-16 16:50:04 +000036static int aspace_get_block(struct inode *inode, sector_t lblock,
37 struct buffer_head *bh_result, int create)
38{
Steven Whitehouse5c676f62006-02-27 17:23:27 -050039 gfs2_assert_warn(inode->i_sb->s_fs_info, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +000040 return -EOPNOTSUPP;
41}
42
43static 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
Steven Whitehouse66de0452006-07-03 13:37:30 -040049static const struct address_space_operations aspace_aops = {
David Teiglandb3b94fa2006-01-16 16:50:04 +000050 .writepage = gfs2_aspace_writepage,
Steven Whitehouse4340fe62006-07-11 09:46:33 -040051 .releasepage = gfs2_releasepage,
Steven Whitehouse52d4c742007-11-01 09:34:14 +000052 .sync_page = block_sync_page,
David Teiglandb3b94fa2006-01-16 16:50:04 +000053};
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
68struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp)
69{
70 struct inode *aspace;
Bob Peterson091806e2008-04-29 12:35:48 -050071 struct gfs2_inode *ip;
David Teiglandb3b94fa2006-01-16 16:50:04 +000072
73 aspace = new_inode(sdp->sd_vfs);
74 if (aspace) {
Steven Whitehousef3bba032006-07-11 09:50:54 -040075 mapping_set_gfp_mask(aspace->i_mapping, GFP_NOFS);
David Teiglandb3b94fa2006-01-16 16:50:04 +000076 aspace->i_mapping->a_ops = &aspace_aops;
77 aspace->i_size = ~0ULL;
Bob Peterson091806e2008-04-29 12:35:48 -050078 ip = GFS2_I(aspace);
79 clear_bit(GIF_USER, &ip->i_flags);
David Teiglandb3b94fa2006-01-16 16:50:04 +000080 insert_inode_hash(aspace);
81 }
David Teiglandb3b94fa2006-01-16 16:50:04 +000082 return aspace;
83}
84
85void gfs2_aspace_put(struct inode *aspace)
86{
87 remove_inode_hash(aspace);
88 iput(aspace);
89}
90
91/**
David Teiglandb3b94fa2006-01-16 16:50:04 +000092 * gfs2_meta_sync - Sync all buffers associated with a glock
93 * @gl: The glock
David Teiglandb3b94fa2006-01-16 16:50:04 +000094 *
95 */
96
Steven Whitehouse7276b3b2006-09-21 17:05:23 -040097void gfs2_meta_sync(struct gfs2_glock *gl)
David Teiglandb3b94fa2006-01-16 16:50:04 +000098{
99 struct address_space *mapping = gl->gl_aspace->i_mapping;
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400100 int error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000101
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400102 filemap_fdatawrite(mapping);
103 error = filemap_fdatawait(mapping);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000104
105 if (error)
106 gfs2_io_error(gl->gl_sbd);
107}
108
109/**
Steven Whitehouse6802e342008-05-21 17:03:22 +0100110 * gfs2_getbuf - Get a buffer with a given address space
Steven Whitehousecb4c0312006-11-23 11:16:32 -0500111 * @gl: the glock
David Teiglandb3b94fa2006-01-16 16:50:04 +0000112 * @blkno: the block number (filesystem scope)
113 * @create: 1 if the buffer should be created
114 *
115 * Returns: the buffer
116 */
117
Steven Whitehouse6802e342008-05-21 17:03:22 +0100118struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000119{
Steven Whitehousecb4c0312006-11-23 11:16:32 -0500120 struct address_space *mapping = gl->gl_aspace->i_mapping;
121 struct gfs2_sbd *sdp = gl->gl_sbd;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000122 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 (;;) {
Steven Whitehousecb4c0312006-11-23 11:16:32 -0500134 page = grab_cache_page(mapping, index);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000135 if (page)
136 break;
137 yield();
138 }
139 } else {
Steven Whitehousecb4c0312006-11-23 11:16:32 -0500140 page = find_lock_page(mapping, index);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000141 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
163static 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
Steven Whitehousecd915492006-09-04 12:49:07 -0400183struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000184{
185 struct buffer_head *bh;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100186 bh = gfs2_getbuf(gl, blkno, CREATE);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000187 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
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400195 * @flags: flags
David Teiglandb3b94fa2006-01-16 16:50:04 +0000196 * @bhp: the place where the buffer is returned (NULL on failure)
197 *
198 * Returns: errno
199 */
200
Steven Whitehousecd915492006-09-04 12:49:07 -0400201int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000202 struct buffer_head **bhp)
203{
Steven Whitehouse6802e342008-05-21 17:03:22 +0100204 *bhp = gfs2_getbuf(gl, blkno, CREATE);
Bob Peterson15c7cee2007-12-11 19:29:17 -0600205 if (!buffer_uptodate(*bhp)) {
Steven Whitehouse2e565bb2006-10-02 11:38:25 -0400206 ll_rw_block(READ_META, 1, bhp);
Bob Peterson15c7cee2007-12-11 19:29:17 -0600207 if (flags & DIO_WAIT) {
208 int error = gfs2_meta_wait(gl->gl_sbd, *bhp);
209 if (error) {
210 brelse(*bhp);
211 return error;
212 }
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400213 }
214 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000215
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400216 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000217}
218
219/**
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400220 * gfs2_meta_wait - Reread a block from disk
David Teiglandb3b94fa2006-01-16 16:50:04 +0000221 * @sdp: the filesystem
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400222 * @bh: The block to wait for
David Teiglandb3b94fa2006-01-16 16:50:04 +0000223 *
224 * Returns: errno
225 */
226
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400227int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000228{
229 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
230 return -EIO;
231
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400232 wait_on_buffer(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000233
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400234 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;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000239 }
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400240 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
241 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000242
243 return 0;
244}
245
246/**
Steven Whitehouse586dfda2006-01-18 11:32:00 +0000247 * gfs2_attach_bufdata - attach a struct gfs2_bufdata structure to a buffer
David Teiglandb3b94fa2006-01-16 16:50:04 +0000248 * @gl: the glock the buffer belongs to
249 * @bh: The buffer to be attached to
Steven Whitehouse586dfda2006-01-18 11:32:00 +0000250 * @meta: Flag to indicate whether its metadata or not
David Teiglandb3b94fa2006-01-16 16:50:04 +0000251 */
252
Steven Whitehouse568f4c92006-02-27 12:00:42 -0500253void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh,
254 int meta)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000255{
256 struct gfs2_bufdata *bd;
257
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000258 if (meta)
259 lock_page(bh->b_page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000260
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500261 if (bh->b_private) {
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000262 if (meta)
263 unlock_page(bh->b_page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000264 return;
265 }
266
Bob Peterson3e5cd082008-01-16 08:45:39 -0600267 bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000268 bd->bd_bh = bh;
269 bd->bd_gl = gl;
270
271 INIT_LIST_HEAD(&bd->bd_list_tr);
Steven Whitehouse82ffa512006-09-04 14:47:06 -0400272 if (meta)
Steven Whitehouse586dfda2006-01-18 11:32:00 +0000273 lops_init_le(&bd->bd_le, &gfs2_buf_lops);
Steven Whitehouse82ffa512006-09-04 14:47:06 -0400274 else
Steven Whitehouse586dfda2006-01-18 11:32:00 +0000275 lops_init_le(&bd->bd_le, &gfs2_databuf_lops);
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500276 bh->b_private = bd;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000277
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000278 if (meta)
279 unlock_page(bh->b_page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000280}
281
Steven Whitehouse16615be2007-09-17 10:59:52 +0100282void 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) {
Steven Whitehousef91a0d32007-10-15 16:29:05 +0100302 gfs2_remove_from_ail(bd);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100303 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
David Teiglandb3b94fa2006-01-16 16:50:04 +0000313/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000314 * 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
Steven Whitehousecd915492006-09-04 12:49:07 -0400321void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000322{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400323 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000324 struct buffer_head *bh;
325
326 while (blen) {
Steven Whitehouse6802e342008-05-21 17:03:22 +0100327 bh = gfs2_getbuf(ip->i_gl, bstart, NO_CREATE);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000328 if (bh) {
Steven Whitehouse1ad38c42007-09-03 11:01:33 +0100329 lock_buffer(bh);
330 gfs2_log_lock(sdp);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100331 gfs2_remove_from_journal(bh, current->journal_info, 1);
Steven Whitehouse1ad38c42007-09-03 11:01:33 +0100332 gfs2_log_unlock(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000333 unlock_buffer(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000334 brelse(bh);
335 }
336
337 bstart++;
338 blen--;
339 }
340}
341
342/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000343 * 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 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000350 * Returns: errno
351 */
352
Steven Whitehousecd915492006-09-04 12:49:07 -0400353int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000354 int new, struct buffer_head **bhp)
355{
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400356 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
357 struct gfs2_glock *gl = ip->i_gl;
Steven Whitehousef91a0d32007-10-15 16:29:05 +0100358 struct buffer_head *bh;
359 int ret = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000360
361 if (new) {
Steven Whitehousef91a0d32007-10-15 16:29:05 +0100362 BUG_ON(height == 0);
363 bh = gfs2_meta_new(gl, num);
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000364 gfs2_trans_add_bh(ip->i_gl, bh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000365 gfs2_metatype_set(bh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
366 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400367 } else {
368 u32 mtype = height ? GFS2_METATYPE_IN : GFS2_METATYPE_DI;
Steven Whitehousef91a0d32007-10-15 16:29:05 +0100369 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;
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400373 }
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400374 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000375 *bhp = bh;
Steven Whitehousef91a0d32007-10-15 16:29:05 +0100376 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000377}
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 *
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400385 * returns: the first buffer in the extent
David Teiglandb3b94fa2006-01-16 16:50:04 +0000386 */
387
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400388struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000389{
390 struct gfs2_sbd *sdp = gl->gl_sbd;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000391 struct buffer_head *first_bh, *bh;
Steven Whitehousecd915492006-09-04 12:49:07 -0400392 u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >>
Steven Whitehouse568f4c92006-02-27 12:00:42 -0500393 sdp->sd_sb.sb_bsize_shift;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000394
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400395 BUG_ON(!extlen);
396
397 if (max_ra < 1)
398 max_ra = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000399 if (extlen > max_ra)
400 extlen = max_ra;
401
Steven Whitehouse6802e342008-05-21 17:03:22 +0100402 first_bh = gfs2_getbuf(gl, dblock, CREATE);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000403
404 if (buffer_uptodate(first_bh))
405 goto out;
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400406 if (!buffer_locked(first_bh))
Steven Whitehouse2e565bb2006-10-02 11:38:25 -0400407 ll_rw_block(READ_META, 1, &first_bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000408
409 dblock++;
410 extlen--;
411
412 while (extlen) {
Steven Whitehouse6802e342008-05-21 17:03:22 +0100413 bh = gfs2_getbuf(gl, dblock, CREATE);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000414
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400415 if (!buffer_uptodate(bh) && !buffer_locked(bh))
416 ll_rw_block(READA, 1, &bh);
417 brelse(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000418 dblock++;
419 extlen--;
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400420 if (!buffer_locked(first_bh) && buffer_uptodate(first_bh))
421 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000422 }
423
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400424 wait_on_buffer(first_bh);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400425out:
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400426 return first_bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000427}
428