blob: 4b1aced9023d8fead3e9c48f66b4884a61edc113 [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -04003 * Copyright (C) 2004-2006 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>
Fabio Massimo Di Nitto7d308592006-09-19 07:56:29 +020022#include <linux/lm_interface.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000023
24#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050025#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000026#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"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050034#include "util.h"
Steven Whitehouse4340fe62006-07-11 09:46:33 -040035#include "ops_address.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000036
David Teiglandb3b94fa2006-01-16 16:50:04 +000037static int aspace_get_block(struct inode *inode, sector_t lblock,
38 struct buffer_head *bh_result, int create)
39{
Steven Whitehouse5c676f62006-02-27 17:23:27 -050040 gfs2_assert_warn(inode->i_sb->s_fs_info, 0);
David Teiglandb3b94fa2006-01-16 16:50:04 +000041 return -EOPNOTSUPP;
42}
43
44static 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
Steven Whitehouse66de0452006-07-03 13:37:30 -040050static const struct address_space_operations aspace_aops = {
David Teiglandb3b94fa2006-01-16 16:50:04 +000051 .writepage = gfs2_aspace_writepage,
Steven Whitehouse4340fe62006-07-11 09:46:33 -040052 .releasepage = gfs2_releasepage,
Steven Whitehouse52d4c742007-11-01 09:34:14 +000053 .sync_page = block_sync_page,
David Teiglandb3b94fa2006-01-16 16:50:04 +000054};
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
69struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp)
70{
71 struct inode *aspace;
72
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;
Theodore Ts'obba9dfd2006-09-27 01:50:31 -070078 aspace->i_private = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +000079 insert_inode_hash(aspace);
80 }
David Teiglandb3b94fa2006-01-16 16:50:04 +000081 return aspace;
82}
83
84void gfs2_aspace_put(struct inode *aspace)
85{
86 remove_inode_hash(aspace);
87 iput(aspace);
88}
89
90/**
David Teiglandb3b94fa2006-01-16 16:50:04 +000091 * gfs2_meta_inval - Invalidate all buffers associated with a glock
92 * @gl: the glock
93 *
94 */
95
96void 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
David Teiglandb3b94fa2006-01-16 16:50:04 +0000114 *
115 */
116
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400117void gfs2_meta_sync(struct gfs2_glock *gl)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000118{
119 struct address_space *mapping = gl->gl_aspace->i_mapping;
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400120 int error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000121
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400122 filemap_fdatawrite(mapping);
123 error = filemap_fdatawait(mapping);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000124
125 if (error)
126 gfs2_io_error(gl->gl_sbd);
127}
128
129/**
130 * getbuf - Get a buffer with a given address space
Steven Whitehousecb4c0312006-11-23 11:16:32 -0500131 * @gl: the glock
David Teiglandb3b94fa2006-01-16 16:50:04 +0000132 * @blkno: the block number (filesystem scope)
133 * @create: 1 if the buffer should be created
134 *
135 * Returns: the buffer
136 */
137
Steven Whitehousecb4c0312006-11-23 11:16:32 -0500138static struct buffer_head *getbuf(struct gfs2_glock *gl, u64 blkno, int create)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000139{
Steven Whitehousecb4c0312006-11-23 11:16:32 -0500140 struct address_space *mapping = gl->gl_aspace->i_mapping;
141 struct gfs2_sbd *sdp = gl->gl_sbd;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000142 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 (;;) {
Steven Whitehousecb4c0312006-11-23 11:16:32 -0500154 page = grab_cache_page(mapping, index);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000155 if (page)
156 break;
157 yield();
158 }
159 } else {
Steven Whitehousecb4c0312006-11-23 11:16:32 -0500160 page = find_lock_page(mapping, index);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000161 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
183static 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
Steven Whitehousecd915492006-09-04 12:49:07 -0400203struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000204{
205 struct buffer_head *bh;
Steven Whitehousecb4c0312006-11-23 11:16:32 -0500206 bh = getbuf(gl, blkno, CREATE);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000207 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
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400215 * @flags: flags
David Teiglandb3b94fa2006-01-16 16:50:04 +0000216 * @bhp: the place where the buffer is returned (NULL on failure)
217 *
218 * Returns: errno
219 */
220
Steven Whitehousecd915492006-09-04 12:49:07 -0400221int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000222 struct buffer_head **bhp)
223{
Steven Whitehousecb4c0312006-11-23 11:16:32 -0500224 *bhp = getbuf(gl, blkno, CREATE);
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400225 if (!buffer_uptodate(*bhp))
Steven Whitehouse2e565bb2006-10-02 11:38:25 -0400226 ll_rw_block(READ_META, 1, bhp);
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400227 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 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000234
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400235 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000236}
237
238/**
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400239 * gfs2_meta_wait - Reread a block from disk
David Teiglandb3b94fa2006-01-16 16:50:04 +0000240 * @sdp: the filesystem
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400241 * @bh: The block to wait for
David Teiglandb3b94fa2006-01-16 16:50:04 +0000242 *
243 * Returns: errno
244 */
245
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400246int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000247{
248 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
249 return -EIO;
250
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400251 wait_on_buffer(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000252
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400253 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;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000258 }
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400259 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
260 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000261
262 return 0;
263}
264
265/**
Steven Whitehouse586dfda2006-01-18 11:32:00 +0000266 * gfs2_attach_bufdata - attach a struct gfs2_bufdata structure to a buffer
David Teiglandb3b94fa2006-01-16 16:50:04 +0000267 * @gl: the glock the buffer belongs to
268 * @bh: The buffer to be attached to
Steven Whitehouse586dfda2006-01-18 11:32:00 +0000269 * @meta: Flag to indicate whether its metadata or not
David Teiglandb3b94fa2006-01-16 16:50:04 +0000270 */
271
Steven Whitehouse568f4c92006-02-27 12:00:42 -0500272void gfs2_attach_bufdata(struct gfs2_glock *gl, struct buffer_head *bh,
273 int meta)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000274{
275 struct gfs2_bufdata *bd;
276
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000277 if (meta)
278 lock_page(bh->b_page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000279
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500280 if (bh->b_private) {
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000281 if (meta)
282 unlock_page(bh->b_page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000283 return;
284 }
285
Robert P. J. Dayc3762222007-02-10 01:45:03 -0800286 bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL),
David Teiglandb3b94fa2006-01-16 16:50:04 +0000287 bd->bd_bh = bh;
288 bd->bd_gl = gl;
289
290 INIT_LIST_HEAD(&bd->bd_list_tr);
Steven Whitehouse82ffa512006-09-04 14:47:06 -0400291 if (meta)
Steven Whitehouse586dfda2006-01-18 11:32:00 +0000292 lops_init_le(&bd->bd_le, &gfs2_buf_lops);
Steven Whitehouse82ffa512006-09-04 14:47:06 -0400293 else
Steven Whitehouse586dfda2006-01-18 11:32:00 +0000294 lops_init_le(&bd->bd_le, &gfs2_databuf_lops);
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500295 bh->b_private = bd;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000296
Steven Whitehouse18ec7d52006-02-08 11:50:51 +0000297 if (meta)
298 unlock_page(bh->b_page);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000299}
300
Steven Whitehouse16615be2007-09-17 10:59:52 +0100301void 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) {
Steven Whitehousef91a0d32007-10-15 16:29:05 +0100321 gfs2_remove_from_ail(bd);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100322 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
David Teiglandb3b94fa2006-01-16 16:50:04 +0000332/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000333 * 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
Steven Whitehousecd915492006-09-04 12:49:07 -0400340void gfs2_meta_wipe(struct gfs2_inode *ip, u64 bstart, u32 blen)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000341{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400342 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000343 struct buffer_head *bh;
344
345 while (blen) {
Steven Whitehousecb4c0312006-11-23 11:16:32 -0500346 bh = getbuf(ip->i_gl, bstart, NO_CREATE);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000347 if (bh) {
Steven Whitehouse1ad38c42007-09-03 11:01:33 +0100348 lock_buffer(bh);
349 gfs2_log_lock(sdp);
Steven Whitehouse16615be2007-09-17 10:59:52 +0100350 gfs2_remove_from_journal(bh, current->journal_info, 1);
Steven Whitehouse1ad38c42007-09-03 11:01:33 +0100351 gfs2_log_unlock(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000352 unlock_buffer(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000353 brelse(bh);
354 }
355
356 bstart++;
357 blen--;
358 }
359}
360
361/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000362 * 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 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000369 * Returns: errno
370 */
371
Steven Whitehousecd915492006-09-04 12:49:07 -0400372int gfs2_meta_indirect_buffer(struct gfs2_inode *ip, int height, u64 num,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000373 int new, struct buffer_head **bhp)
374{
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400375 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
376 struct gfs2_glock *gl = ip->i_gl;
Steven Whitehousef91a0d32007-10-15 16:29:05 +0100377 struct buffer_head *bh;
378 int ret = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000379
380 if (new) {
Steven Whitehousef91a0d32007-10-15 16:29:05 +0100381 BUG_ON(height == 0);
382 bh = gfs2_meta_new(gl, num);
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000383 gfs2_trans_add_bh(ip->i_gl, bh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000384 gfs2_metatype_set(bh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
385 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400386 } else {
387 u32 mtype = height ? GFS2_METATYPE_IN : GFS2_METATYPE_DI;
Steven Whitehousef91a0d32007-10-15 16:29:05 +0100388 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;
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400392 }
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400393 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000394 *bhp = bh;
Steven Whitehousef91a0d32007-10-15 16:29:05 +0100395 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000396}
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 *
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400404 * returns: the first buffer in the extent
David Teiglandb3b94fa2006-01-16 16:50:04 +0000405 */
406
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400407struct buffer_head *gfs2_meta_ra(struct gfs2_glock *gl, u64 dblock, u32 extlen)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000408{
409 struct gfs2_sbd *sdp = gl->gl_sbd;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000410 struct buffer_head *first_bh, *bh;
Steven Whitehousecd915492006-09-04 12:49:07 -0400411 u32 max_ra = gfs2_tune_get(sdp, gt_max_readahead) >>
Steven Whitehouse568f4c92006-02-27 12:00:42 -0500412 sdp->sd_sb.sb_bsize_shift;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000413
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400414 BUG_ON(!extlen);
415
416 if (max_ra < 1)
417 max_ra = 1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000418 if (extlen > max_ra)
419 extlen = max_ra;
420
Steven Whitehousecb4c0312006-11-23 11:16:32 -0500421 first_bh = getbuf(gl, dblock, CREATE);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000422
423 if (buffer_uptodate(first_bh))
424 goto out;
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400425 if (!buffer_locked(first_bh))
Steven Whitehouse2e565bb2006-10-02 11:38:25 -0400426 ll_rw_block(READ_META, 1, &first_bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000427
428 dblock++;
429 extlen--;
430
431 while (extlen) {
Steven Whitehousecb4c0312006-11-23 11:16:32 -0500432 bh = getbuf(gl, dblock, CREATE);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000433
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400434 if (!buffer_uptodate(bh) && !buffer_locked(bh))
435 ll_rw_block(READA, 1, &bh);
436 brelse(bh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000437 dblock++;
438 extlen--;
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400439 if (!buffer_locked(first_bh) && buffer_uptodate(first_bh))
440 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000441 }
442
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400443 wait_on_buffer(first_bh);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400444out:
Steven Whitehouse7276b3b2006-09-21 17:05:23 -0400445 return first_bh;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000446}
447