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Richard Sharpe a99c845fdc Fix casesensitivity=insensitive deadlock 
When casesensitivity=insensitive is set for the
file system, we can deadlock in a rename if the user uses different case
for each path. For example rename("A/some-file.txt", "a/some-file.txt").

The simple test for this is:

1. mkdir some-dir in a ZFS file system
2. touch some-dir/some-file.txt
3. mv Some-dir/some-file.txt some-dir/some-other-file.txt

This last request deadlocks trying to relock the i_mutex on the inode for
the parent directory.

The solution is to use d_add_ci in zpl_lookup if we are on a file system
that has the casesensitivity=insensitive attribute set.

This patch checks if we are working on a case insensitive file system and if
so, allocates storage for the case insensitive name and passes it to
zfs_lookup and then calls d_add_ci instead of d_splice_alias.

The performance impact seems to be minimal even though we have introduced a
kmalloc and kfree in the lookup path.

The problem was found when running Microsoft's FSCT against Samba on top of
ZFS On Linux.

Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4136
 		2016-03-22 17:54:07 -07:00
..
Makefile.in Support parallel build trees (VPATH builds) 2015-07-17 13:42:51 -07:00
arc.c Prevent arc_c collapse 2016-01-29 09:52:12 -08:00
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 5027 - zfs large block support 2015-05-11 12:23:16 -07:00
dbuf.c Illumos 6267 - dn_bonus evicted too early 2015-10-13 15:32:16 -07:00
dbuf_stats.c Illumos 5497 - lock contention on arcs_mtx 2015-06-11 10:27:25 -07:00
ddt.c Handle zap_lookup() failure in ddt_object_load() 2015-08-19 14:32:50 -07:00
ddt_zap.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
dmu.c zvol processing should use struct bio 2015-09-04 15:30:24 -04:00
dmu_diff.c Illumos 5369 - arc flags should be an enum 2015-06-11 10:27:25 -07:00
dmu_object.c Illumos 6370 - ZFS send fails to transmit some holes 2016-03-15 10:01:48 -07:00
dmu_objset.c Illumos 6267 - dn_bonus evicted too early 2015-10-13 15:32:16 -07:00
dmu_send.c Illumos 5946, 5945 2015-07-06 09:31:30 -07:00
dmu_traverse.c Illumos 6370 - ZFS send fails to transmit some holes 2016-03-15 10:01:48 -07:00
dmu_tx.c Illumos 5911 - ZFS "hangs" while deleting file 2015-07-06 09:31:42 -07:00
dmu_zfetch.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
dnode.c Illumos 5911 - ZFS "hangs" while deleting file 2015-07-06 09:31:42 -07:00
dnode_sync.c Illumos 6267 - dn_bonus evicted too early 2015-10-13 15:32:16 -07:00
dsl_bookmark.c Illumos 4951 - ZFS administrative commands should use reserved space 2015-05-04 09:41:10 -07:00
dsl_dataset.c Allow recovery from corrupted snapshot maps 2015-08-28 11:56:32 -07:00
dsl_deadlist.c Illumos 5027 - zfs large block support 2015-05-11 12:23:16 -07:00
dsl_deleg.c Illumos 4951 - ZFS administrative commands should use reserved space 2015-05-04 09:41:10 -07:00
dsl_destroy.c Illumos 5027 - zfs large block support 2015-05-11 12:23:16 -07:00
dsl_dir.c Illumos 4951 - ZFS administrative commands should use reserved space 2015-05-04 09:41:10 -07:00
dsl_pool.c Align thread priority with Linux defaults 2015-07-28 13:36:47 -07:00
dsl_prop.c Illumos 4951 - ZFS administrative commands should use reserved space 2015-05-04 09:41:10 -07:00
dsl_scan.c Illumos 5347 - idle pool may run itself out of space 2015-07-14 10:35:21 -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 Illumos 4951 - ZFS administrative commands should use reserved space 2015-05-04 09:41:10 -07:00
fm.c zfsdev_getminor() should check for invalid file handles 2015-06-22 17:02:13 -07:00
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
metaslab.c Disable LBA weighting on files and SSDs 2015-09-01 15:22:07 -07:00
multilist.c Illumos 5497 - lock contention on arcs_mtx 2015-06-11 10:27:25 -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 Prevent SA length overflow 2016-01-29 09:41:14 -08:00
sha256.c Add linux sha2 support 2010-08-31 13:41:59 -07:00
spa.c Make zio_taskq_batch_pct user configurable 2015-12-23 17:29:34 -08:00
spa_boot.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
spa_config.c Linux 4.2 compat: vfs_rename() 2015-08-19 16:04:33 -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 Illumos 5027 - zfs large block support 2015-05-11 12:23:16 -07:00
spa_misc.c Add spa_slop_shift module option 2015-09-02 09:30:18 -07:00
spa_stats.c Illumos 5369 - arc flags should be an enum 2015-06-11 10:27:25 -07:00
space_map.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
space_reftree.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
trace.c Illumos 5497 - lock contention on arcs_mtx 2015-06-11 10:27:25 -07:00
txg.c Align thread priority with Linux defaults 2015-07-28 13:36:47 -07:00
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.c Disable LBA weighting on files and SSDs 2015-09-01 15:22:07 -07:00
vdev_cache.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
vdev_disk.c Fix use-after-free in vdev_disk_physio_completion 2015-10-13 15:31:44 -07:00
vdev_file.c Disable LBA weighting on files and SSDs 2015-09-01 15:22:07 -07:00
vdev_label.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
vdev_mirror.c Illumos #5244 - zio pipeline callers should explicitly invoke next stage 2015-04-30 15:07:47 -07:00
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 vdev_queue_aggregate() deadlock 2015-12-23 17:29:34 -08:00
vdev_raidz.c Illumos #5244 - zio pipeline callers should explicitly invoke next stage 2015-04-30 15:07:47 -07:00
vdev_root.c Illumos #3598 2013-10-31 14:58:04 -07:00
zap.c Fix empty xattr dir causing lockup 2015-12-30 16:13:30 -08:00
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 Add zap_prefetch() interface 2015-12-23 17:29:34 -08:00
zfeature.c Use cached feature info in spa_add_feature_stats() 2015-03-05 14:11:10 -08:00
zfeature_common.c Illumos 5027 - zfs large block support 2015-05-11 12:23:16 -07:00
zfs_acl.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
zfs_byteswap.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
zfs_ctldir.c Fix zfsctl_lookup_objset() deadlock 2015-12-23 17:29:34 -08:00
zfs_debug.c Add dbgmsg kstat 2015-09-04 16:08:14 -07:00
zfs_dir.c Make xattr dir truncate and remove in one tx 2015-12-30 16:13:37 -08:00
zfs_fm.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
zfs_fuid.c Illumos #3522 2013-10-30 14:51:27 -07:00
zfs_ioctl.c Follow 0/-E convention for module load errors 2015-12-23 17:29:35 -08:00
zfs_log.c Illumos 5027 - zfs large block support 2015-05-11 12:23:16 -07:00
zfs_onexit.c zfsdev_getminor() should check for invalid file handles 2015-06-22 17:02:13 -07:00
zfs_replay.c Linux AIO Support 2014-09-05 15:11:43 -07:00
zfs_rlock.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
zfs_sa.c Prevent SA length overflow 2016-01-29 09:41:14 -08:00
zfs_vfsops.c Fix zsb->z_hold_mtx deadlock 2016-01-29 09:52:12 -08:00
zfs_vnops.c Fix invalid fileid for snapshot root dentry 2015-09-04 13:23:06 -07:00
zfs_znode.c Close possible zfs_znode_held() race 2016-01-29 09:52:12 -08:00
zil.c Align thread priority with Linux defaults 2015-07-28 13:36:47 -07:00
zio.c Fix vdev_queue_aggregate() deadlock 2015-12-23 17:29:34 -08:00
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 Illumos 5497 - lock contention on arcs_mtx 2015-06-11 10:27:25 -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 3.18 compat: Snapshot auto-mounting 2015-08-31 13:54:39 -07:00
zpl_export.c zfsctl: No need to sync ctldir inodes 2015-08-31 13:54:39 -07:00
zpl_file.c Linux 4.1 compat: loop device on ZFS 2015-08-24 10:17:06 -07:00
zpl_inode.c Fix casesensitivity=insensitive deadlock 2016-03-22 17:54:07 -07:00
zpl_super.c Disable zpl_nr_cached_objects() callback 2015-09-29 15:27:14 -07:00
zpl_xattr.c Linux 4.5 compat: xattr list handler 2016-01-29 09:52:13 -08:00
zrlock.c Illumos 5812 - assertion failed in zrl_tryenter(): zr_owner==NULL 2015-04-30 14:43:40 -07:00
zvol.c Linux 4.4 compat: make_request_fn returns blk_qc_t 2015-12-04 14:58:32 -08:00