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e6603b7c1f
mirror_zfs/module/zfs
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Tim Chase e6603b7c1f Fix sync behavior for disk vdevs 
Prior to b39c22b, which was first generally available in the 0.6.5
release as b39c22b, ZoL never actually submitted synchronous read or write
requests to the Linux block layer.  This means the vdev_disk_dio_is_sync()
function had always returned false and, therefore, the completion in
dio_request_t.dr_comp was never actually used.

In b39c22b, synchronous ZIO operations were translated to synchronous
BIO requests in vdev_disk_io_start().  The follow-on commits 5592404 and
aa159af fixed several problems introduced by b39c22b.  In particular,
5592404 introduced the new flag parameter "wait" to __vdev_disk_physio()
but under ZoL, since vdev_disk_physio() is never actually used, the wait
flag was always zero so the new code had no effect other than to cause
a bug in the use of the dio_request_t.dr_comp which was fixed by aa159af.

The original rationale for introducing synchronous operations in b39c22b
was to hurry certains requests through the BIO layer which would have
otherwise been subject to its unplug timer which would increase the
latency.  This behavior of the unplug timer, however, went away during the
transition of the plug/unplug system between kernels 2.6.32 and 2.6.39.

To handle the unplug timer behavior on 2.6.32-2.6.35 kernels the
BIO_RW_UNPLUG flag is used as a hint to suppress the plugging behavior.

For kernels 2.6.36-2.6.38, the REQ_UNPLUG macro will be available and
ise used for the same purpose.

Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4858
2016-07-25 14:24:47 -07:00
..
arc.c Prevent null dereferences when accessing dbuf kstat 2016-07-14 16:25:03 -07:00
blkptr.c Illumos 4757, 4913 2014-08-01 14:28:05 -07:00
bplist.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
bpobj.c Illumos 5810 - zdb should print details of bpobj 2015-05-11 15:10:24 -07:00
bptree.c Illumos 5960, 5925 2016-01-08 15:08:19 -08:00
bqueue.c Allow 16M send/recv blocks 2016-01-08 20:23:23 -05:00
dbuf_stats.c Fix dbuf_stats_hash_table_data race 2016-07-14 16:25:04 -07:00
dbuf.c Fix PANIC: metaslab_free_dva(): bad DVA X:Y:Z 2016-07-12 16:47:44 -07:00
ddt_zap.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
ddt.c Handle zap_lookup() failure in ddt_object_load() 2015-08-19 14:32:50 -07:00
dmu_diff.c Illumos 5960, 5925 2016-01-08 15:08:19 -08:00
dmu_object.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
dmu_objset.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
dmu_send.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
dmu_traverse.c OpenZFS 2605, 6980, 6902 2016-06-28 13:47:02 -07:00
dmu_tx.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
dmu_zfetch.c Illumos 6281 - prefetching should apply to 1MB reads 2016-01-12 13:51:27 -08:00
dmu.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
dnode_sync.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
dnode.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
dsl_bookmark.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
dsl_dataset.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
dsl_deadlist.c Handle damaged blk_birth in dsl_deadlist_insert() 2015-12-15 16:12:31 -08:00
dsl_deleg.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
dsl_destroy.c OpenZFS 2605, 6980, 6902 2016-06-28 13:47:02 -07:00
dsl_dir.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
dsl_pool.c Fix self-healing IO prior to dsl_pool_init() completion 2016-05-27 14:11:25 -07:00
dsl_prop.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
dsl_scan.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
dsl_synctask.c Illumos 4951 - ZFS administrative commands should use reserved space 2015-05-04 09:41:10 -07:00
dsl_userhold.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
fm.c Illumos 5045 - use atomic_{inc,dec}_* instead of atomic_add_* 2016-01-15 15:38:36 -08:00
gzip.c cstyle: Resolve C style issues 2013-12-18 16:46:35 -08:00
lz4.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
lzjb.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
Makefile.in Add RAID-Z routines for SSE2 instruction set, in x86_64 mode. 2016-07-13 10:24:55 -07:00
metaslab.c gcc build error: -Wbool-compare in metaslab.c 2016-03-30 09:36:51 -07:00
multilist.c Identify locks flagged by lockdep 2015-12-22 10:21:33 -08:00
pathname.c Add pn_alloc()/pn_free() functions 2016-04-21 09:49:25 -07:00
policy.c Fix NFS credential 2016-06-21 09:58:37 -07:00
range_tree.c Illumos 5163 - arc should reap range_seg_cache 2015-06-25 08:58:16 -07:00
refcount.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
rrwlock.c Illumos 5008 - lock contention (rrw_exit) while running a read only load 2015-07-06 09:34:13 -07:00
sa.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
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 OpenZFS 6736 - ZFS per-vdev ZAPs 2016-05-02 14:27:45 -07:00
spa_errlog.c Illumos 4914 - zfs on-disk bookmark structure should be named *_phys_t 2014-08-06 14:48:41 -07:00
spa_history.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
spa_misc.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
spa_stats.c Illumos 5369 - arc flags should be an enum 2015-06-11 10:27:25 -07:00
spa.c Fix sync behavior for disk vdevs 2016-07-25 14:24:47 -07:00
space_map.c Illumos 5960, 5925 2016-01-08 15:08:19 -08:00
space_reftree.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
trace.c OpenZFS 6531 - Provide mechanism to artificially limit disk performance 2016-05-26 10:11:51 -07:00
txg.c Increase default user space stack size 2016-01-13 13:55:12 -08:00
uberblock.c Illumos 5347 - idle pool may run itself out of space 2015-07-14 10:35:21 -07:00
unique.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
vdev_cache.c Illumos 5045 - use atomic_{inc,dec}_* instead of atomic_add_* 2016-01-15 15:38:36 -08:00
vdev_disk.c Fix sync behavior for disk vdevs 2016-07-25 14:24:47 -07:00
vdev_file.c OpenZFS 6531 - Provide mechanism to artificially limit disk performance 2016-05-26 10:11:51 -07:00
vdev_label.c Fix memleak in vdev_config_generate_stats 2016-05-31 16:05:21 -07:00
vdev_mirror.c FreeBSD r256956: Improve ZFS N-way mirror read performance by using load and locality information. 2016-02-26 11:24:35 -08:00
vdev_missing.c Illumos #5244 - zio pipeline callers should explicitly invoke next stage 2015-04-30 15:07:47 -07:00
vdev_queue.c Fix self-healing IO prior to dsl_pool_init() completion 2016-05-27 14:11:25 -07:00
vdev_raidz_math_avx2.c Fixes and enhancements of SIMD raidz parity 2016-07-19 16:43:07 -07:00
vdev_raidz_math_impl.h SIMD implementation of vdev_raidz generate and reconstruct routines 2016-06-21 09:27:26 -07:00
vdev_raidz_math_scalar.c Fixes and enhancements of SIMD raidz parity 2016-07-19 16:43:07 -07:00
vdev_raidz_math_sse2.c Add RAID-Z routines for SSE2 instruction set, in x86_64 mode. 2016-07-13 10:24:55 -07:00
vdev_raidz_math_ssse3.c Fixes and enhancements of SIMD raidz parity 2016-07-19 16:43:07 -07:00
vdev_raidz_math.c RAIDZ parity kstat rework 2016-07-19 16:43:07 -07:00
vdev_raidz.c Fixes and enhancements of SIMD raidz parity 2016-07-19 16:43:07 -07:00
vdev_root.c Illumos #3598 2013-10-31 14:58:04 -07:00
vdev.c Fix for metaslab_fastwrite_unmark() assert failure 2016-07-25 13:21:43 -07:00
zap_leaf.c Illumos 5314 - Remove "dbuf phys" db->db_data pointer aliases in ZFS 2015-04-28 16:25:20 -07:00
zap_micro.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
zap.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
zfeature_common.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
zfeature.c Revert "zhack: Add 'feature disable' command" 2016-05-17 11:52:07 -07:00
zfs_acl.c Remove znode's z_uid/z_gid member 2016-07-25 13:21:49 -07:00
zfs_byteswap.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
zfs_ctldir.c Remove znode's z_uid/z_gid member 2016-07-25 13:21:49 -07:00
zfs_debug.c Add dbgmsg kstat 2015-09-04 16:08:14 -07:00
zfs_dir.c Remove znode's z_uid/z_gid member 2016-07-25 13:21:49 -07:00
zfs_fm.c Remove wrong ASSERT in annotate_ecksum 2016-02-17 10:43:02 -08:00
zfs_fuid.c Remove znode's z_uid/z_gid member 2016-07-25 13:21:49 -07:00
zfs_ioctl.c Fix filesystem destroy with receive_resume_token 2016-07-15 15:34:46 -07:00
zfs_log.c Remove znode's z_uid/z_gid member 2016-07-25 13:21:49 -07:00
zfs_onexit.c zfsdev_getminor() should check for invalid file handles 2015-06-22 17:02:13 -07:00
zfs_replay.c Implement large_dnode pool feature 2016-06-24 13:13:21 -07:00
zfs_rlock.c Remove dummy znode from zvol_state 2016-05-17 10:29:02 -07:00
zfs_sa.c Use native inode->i_nlink instead of znode->z_links 2016-07-14 16:25:34 -07:00
zfs_vfsops.c Remove znode's z_uid/z_gid member 2016-07-25 13:21:49 -07:00
zfs_vnops.c Remove znode's z_uid/z_gid member 2016-07-25 13:21:49 -07:00
zfs_znode.c Remove znode's z_uid/z_gid member 2016-07-25 13:21:49 -07:00
zil.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
zio_checksum.c Illumos 4757, 4913 2014-08-01 14:28:05 -07:00
zio_compress.c Illumos 5661 - ZFS: "compression = on" should use lz4 if feature is enabled 2015-07-10 12:11:45 -07:00
zio_inject.c OpenZFS 6531 - Provide mechanism to artificially limit disk performance 2016-05-26 10:11:51 -07:00
zio.c OpenZFS 6513 - partially filled holes lose birth time 2016-06-21 10:55:13 -07:00
zle.c Update core ZFS code from build 121 to build 141. 2010-05-28 13:45:14 -07:00
zpl_ctldir.c Linux 4.7 compat: use iterate_shared for concurrent readdir 2016-05-20 11:09:16 -07:00
zpl_export.c zfsctl: No need to sync ctldir inodes 2015-08-31 13:54:39 -07:00
zpl_file.c Linux 4.7 compat: use iterate_shared for concurrent readdir 2016-05-20 11:09:16 -07:00
zpl_inode.c OpenZFS 6314 - buffer overflow in dsl_dataset_name 2016-06-28 13:47:03 -07:00
zpl_super.c Fix memleak in zpl_parse_options 2016-05-31 16:04:26 -07:00
zpl_xattr.c Linux 4.5 compat: Use xattr_handler->name for acl 2016-04-25 08:42:08 -07:00
zrlock.c Illumos 5812 - assertion failed in zrl_tryenter(): zr_owner==NULL 2015-04-30 14:43:40 -07:00
zvol.c OpenZFS 2605, 6980, 6902 2016-06-28 13:47:02 -07:00