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d9b0ebbe82
freebsd-dev/module/zfs
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Etienne Dechamps d9b0ebbe82 Remove the bio_empty_barrier() check. 
To determine whether the kernel is capable of handling empty barrier
BIOs, we check for the presence of the bio_empty_barrier() macro,
which was introduced in 2.6.24. If this macro is defined, then we can
flush disk vdevs; if it isn't, then flushing is disabled.

Unfortunately, the bio_empty_barrier() macro was removed in 2.6.37,
even though the kernel is still capable of handling empty barrier BIOs.

As a result, flushing is effectively disabled on kernels >= 2.6.37,
meaning that starting from this kernel version, zfs doesn't use
barriers to guarantee on-disk data consistency. This is quite bad and
can lead to potential data corruption on power failures.

This patch fixes the issue by removing the configure check for
bio_empty_barrier(), as we don't support kernels <= 2.6.24 anymore.

Thanks to Richard Kojedzinszky for catching this nasty bug.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1318
2013-02-24 10:22:34 -08:00
..
arc.c Enable zfs_arc_memory_throttle_disable by default 2013-02-21 13:38:24 -08:00
bplist.c Switch KM_SLEEP to KM_PUSHPAGE 2012-08-27 12:01:37 -07:00
bpobj.c Illumos #3104: eliminate empty bpobjs 2013-01-08 10:35:43 -08:00
bptree.c Illumos #2619 and #2747 2013-01-08 10:35:35 -08:00
dbuf.c Illumos #3145, #3212 2013-01-08 10:35:44 -08:00
ddt_zap.c Add ddt_object_count() error handling 2012-10-29 08:57:45 -07:00
ddt.c Illumos #2619 and #2747 2013-01-08 10:35:35 -08:00
dmu_diff.c Update to onnv_147 2010-08-26 14:24:34 -07:00
dmu_object.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
dmu_objset.c Switch KM_SLEEP to KM_PUSHPAGE 2013-02-06 11:19:58 -08:00
dmu_send.c Cast 'zfs bad bloc' to ULL for x86 2013-02-04 16:39:08 -08:00
dmu_traverse.c Illumos #2619 and #2747 2013-01-08 10:35:35 -08:00
dmu_tx.c Illumos #3189 kernel panic in test hotspare_onoffline_004_neg 2013-01-14 10:34:53 -08:00
dmu_zfetch.c Switch KM_SLEEP to KM_PUSHPAGE 2012-08-27 12:01:37 -07:00
dmu.c Illumos #3086: unnecessarily setting DS_FLAG_INCONSISTENT on async 2013-01-08 10:35:43 -08:00
dnode_sync.c Illumos #2619 and #2747 2013-01-08 10:35:35 -08:00
dnode.c Illumos #2619 and #2747 2013-01-08 10:35:35 -08:00
dsl_dataset.c Use dsl_dataset_snap_lookup() 2013-01-25 15:07:40 -08:00
dsl_deadlist.c Illumos #3104: eliminate empty bpobjs 2013-01-08 10:35:43 -08:00
dsl_deleg.c Illumos #2619 and #2747 2013-01-08 10:35:35 -08:00
dsl_dir.c Switch KM_SLEEP to KM_PUSHPAGE 2013-02-06 11:19:58 -08:00
dsl_pool.c Illumos #3104: eliminate empty bpobjs 2013-01-08 10:35:43 -08:00
dsl_prop.c Switch KM_SLEEP to KM_PUSHPAGE 2012-09-17 11:22:23 -07:00
dsl_scan.c Illumos #2619 and #2747 2013-01-08 10:35:35 -08:00
dsl_synctask.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
fm.c Condition variable usage, zevent_cv 2012-10-15 16:01:54 -07:00
gzip.c Fix zmod.h usage in userspace 2010-08-31 08:38:46 -07:00
lz4.c Illumos #3035 LZ4 compression support in ZFS and GRUB 2013-01-29 09:28:20 -08:00
lzjb.c Switch KM_SLEEP to KM_PUSHPAGE 2012-08-27 12:01:37 -07:00
Makefile.in Illumos #3035 LZ4 compression support in ZFS and GRUB 2013-01-29 09:28:20 -08:00
metaslab.c Add FASTWRITE algorithm for synchronous writes. 2012-10-17 08:56:41 -07:00
refcount.c Switch KM_SLEEP to KM_PUSHPAGE 2012-08-27 12:01:37 -07:00
rrwlock.c Enable rrwlock.c compilation 2010-12-07 16:05:25 -08:00
sa.c Fix mismatch between SA header size and layout 2013-01-31 10:31:19 -08:00
sha256.c Add linux sha2 support 2010-08-31 13:41:59 -07:00
spa_boot.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
spa_config.c Illumos #2619 and #2747 2013-01-08 10:35:35 -08:00
spa_errlog.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
spa_history.c Switch KM_SLEEP to KM_PUSHPAGE 2012-08-27 12:01:37 -07:00
spa_misc.c Illumos #3090 and #3102 2013-01-08 10:35:42 -08:00
spa.c Make spa.c assertions catch unsupported pre-feature flag pool versions 2013-02-12 10:27:44 -08:00
space_map.c Switch KM_SLEEP to KM_PUSHPAGE 2012-08-27 12:01:37 -07:00
txg.c Illumos #3447 improve the comment in txg.c 2013-01-30 08:55:20 -08:00
uberblock.c Update core ZFS code from build 121 to build 141. 2010-05-28 13:45:14 -07:00
unique.c Switch KM_SLEEP to KM_PUSHPAGE 2012-08-27 12:01:37 -07:00
vdev_cache.c Switch KM_SLEEP to KM_PUSHPAGE 2012-08-27 12:01:37 -07:00
vdev_disk.c Remove the bio_empty_barrier() check. 2013-02-24 10:22:34 -08:00
vdev_file.c Illumos #1948: zpool list should show more detailed pool info 2012-09-19 13:39:05 -07:00
vdev_label.c Illumos #3090 and #3102 2013-01-08 10:35:42 -08:00
vdev_mirror.c Illumos #1948: zpool list should show more detailed pool info 2012-09-19 13:39:05 -07:00
vdev_missing.c Illumos #1948: zpool list should show more detailed pool info 2012-09-19 13:39:05 -07:00
vdev_queue.c Limit zfs_vdev_aggregation_limit to SPA_MAXBLOCKSIZE 2012-10-15 09:28:43 -07:00
vdev_raidz.c Illumos #1948: zpool list should show more detailed pool info 2012-09-19 13:39:05 -07:00
vdev_root.c Illumos #1948: zpool list should show more detailed pool info 2012-09-19 13:39:05 -07:00
vdev.c Illumos #3090 and #3102 2013-01-08 10:35:42 -08:00
zap_leaf.c Switch KM_SLEEP to KM_PUSHPAGE 2012-09-05 08:44:58 -07:00
zap_micro.c Illumos #2619 and #2747 2013-01-08 10:35:35 -08:00
zap.c fzap_cursor_move_to_key() should drop l_rwlock 2013-01-23 16:31:16 -08:00
zfeature_common.c Illumos #3035 LZ4 compression support in ZFS and GRUB 2013-01-29 09:28:20 -08:00
zfeature.c Illumos #3104: eliminate empty bpobjs 2013-01-08 10:35:43 -08:00
zfs_acl.c Avoid gcc -Werror=maybe-uninitialized warnings 2013-01-28 09:10:29 -08:00
zfs_byteswap.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
zfs_ctldir.c Use dsl_dataset_snap_lookup() 2013-01-25 15:07:40 -08:00
zfs_debug.c Use spl_debug_* helpers 2012-02-09 16:37:48 -08:00
zfs_dir.c Revert "Revert "Fix unlink/xattr deadlock"" 2013-01-17 11:24:20 -08:00
zfs_fm.c Illumos #2671: zpool import should not fail if vdev ashift has increased 2012-11-15 11:05:59 -08:00
zfs_fuid.c Drop HAVE_XVATTR macros 2011-03-02 11:44:34 -08:00
zfs_ioctl.c Illumos #3035 LZ4 compression support in ZFS and GRUB 2013-01-29 09:28:20 -08:00
zfs_log.c Revert "Remove TSD zfs_fsyncer_key" 2012-12-20 09:56:28 -08:00
zfs_onexit.c Add linux kernel device support 2010-08-31 13:41:50 -07:00
zfs_replay.c ZFS replay transaction error 5 2012-09-17 11:06:58 -07:00
zfs_rlock.c Switch KM_SLEEP to KM_PUSHPAGE 2012-12-10 09:44:45 -08:00
zfs_sa.c Revert "Use SA_HDL_PRIVATE for SA xattrs" 2012-08-25 09:25:56 -07:00
zfs_vfsops.c Use sb->s_d_op default dentry operations 2013-01-18 15:04:23 -08:00
zfs_vnops.c Revert "Remove TSD zfs_fsyncer_key" 2012-12-20 09:56:28 -08:00
zfs_znode.c Fix 'zfs rollback' on mounted file systems 2013-01-17 09:51:20 -08:00
zil.c Illumos #3086: unnecessarily setting DS_FLAG_INCONSISTENT on async 2013-01-08 10:35:43 -08:00
zio_checksum.c Update core ZFS code from build 121 to build 141. 2010-05-28 13:45:14 -07:00
zio_compress.c Illumos #3035 LZ4 compression support in ZFS and GRUB 2013-01-29 09:28:20 -08:00
zio_inject.c Add missing ZFS tunables 2011-05-04 10:02:37 -07:00
zio.c Illumos #3035 LZ4 compression support in ZFS and GRUB 2013-01-29 09:28:20 -08:00
zle.c Update core ZFS code from build 121 to build 141. 2010-05-28 13:45:14 -07:00
zpl_ctldir.c Add d_clear_d_op() compatibility 2013-01-23 16:33:29 -08:00
zpl_export.c Implement .commit_metadata hook for NFS export 2012-10-03 10:49:45 -07:00
zpl_file.c Annotate KM_PUSHPAGE call paths with PF_NOFS 2012-08-27 12:01:37 -07:00
zpl_inode.c Add explicit MAXNAMELEN check 2013-02-12 10:27:39 -08:00
zpl_super.c Update SAs when an inode is dirtied 2012-12-14 12:18:54 -08:00
zpl_xattr.c Add missing NULL in zpl_xattr_handlers 2012-03-15 15:18:29 -07:00
zrlock.c Export ZFS symbols needed by Lustre. 2010-09-17 16:24:15 -07:00
zvol.c Fix zpool on zvol deadlock 2013-01-18 09:44:55 -08:00