Brian Behlendorf 6857950e46 Fix zpl_mount() deadlock ... Commit 93b43af10 inadvertently introduced the following scenario which can result in a deadlock. This issue was most easily reproduced by LXD containers using a ZFS storage backend but should be reproducible under any workload which is frequently mounting and unmounting. -- THREAD A -- spa_sync() spa_sync_upgrades() rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); <- Waiting on B -- THREAD B -- mount_fs() zpl_mount() zpl_mount_impl() dmu_objset_hold() dmu_objset_hold_flags() dsl_pool_hold() dsl_pool_config_enter() rrw_enter(&dp->dp_config_rwlock, RW_READER, tag); sget() sget_userns() grab_super() down_write(&s->s_umount); <- Waiting on C -- THREAD C -- cleanup_mnt() deactivate_super() down_write(&s->s_umount); deactivate_locked_super() zpl_kill_sb() kill_anon_super() generic_shutdown_super() sync_filesystem() zpl_sync_fs() zfs_sync() zil_commit() txg_wait_synced() <- Waiting on A Reviewed by: Alek Pinchuk <apinchuk@datto.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #7598 Closes #7659 Closes #7691 Closes #7693		2018-07-06 02:46:51 -07:00
..
avl	Fix uninitialized variable in avl_add()	2016-07-25 14:21:34 -07:00
icp	Fix kernel unaligned access on sparc64	2018-07-06 02:46:51 -07:00
nvpair	Linux 4.14 compat: CONFIG_GCC_PLUGIN_RANDSTRUCT	2017-12-04 17:21:39 -08:00
unicode	codebase style improvements for OpenZFS 6459 port	2017-01-22 13:25:40 -08:00
zcommon	Change checksum & IO delay ratelimit values	2018-03-14 16:10:38 -07:00
zfs	Fix zpl_mount() deadlock	2018-07-06 02:46:51 -07:00
zpios	Fedora 28: Fix misc bounds check compiler warnings	2018-05-07 17:19:57 -07:00
.gitignore	Improve gitignore	2017-05-25 10:14:13 -07:00
Makefile.in	GZIP compression offloading with QAT accelerator	2017-03-22 17:58:47 -07:00