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mirror_zfs/module/zfs
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Seth Forshee 3f729907c8 Allow mounting datasets more than once 
Currently mounting an already mounted zfs dataset results in an
error, whereas it is typically allowed with other filesystems.
This causes some bad interactions with mount namespaces. Take
this sequence for example:

- Create a dataset
- Create a snapshot of the dataset
- Create a clone of the snapshot
- Create a new mount namespace
- Rename the original dataset

The rename results in unmounting and remounting the clone in the
original mount namespace, however the remount fails because the
dataset is still mounted in the new mount namespace. (Note that
this means the mount in the new mount namespace is never being
unmounted, so perhaps the unmount/remount of the clone isn't
actually necessary.)

The problem here is a result of the way mounting is implemented
in the kernel module. Since it is not mounting block devices it
uses mount_nodev() instead of the usual mount_bdev(). However,
mount_nodev() is written for filesystems for which each mount is
a new instance (i.e. a new super block), and zfs should be able
to detect when a mount request can be satisfied using an existing
super block.

Change zpl_mount() to call sget() directly with it's own test
callback. Passing the objset_t object as the fs data allows
checking if a superblock already exists for the dataset, and in
that case we just need to return a new reference for the sb's
root dentry.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tom Caputi <tcaputi@datto.com>
Signed-off-by: Alek Pinchuk <apinchuk@datto.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Closes #5796
Closes #7207
2018-05-07 17:19:57 -07:00
..
abd.c Update for cppcheck v1.80 2018-01-30 10:27:31 -06:00
arc.c Fix zfs_arc_max minimum tuning 2018-05-07 17:19:57 -07:00
blkptr.c OpenZFS 8067 - zdb should be able to dump literal embedded block pointer 2017-07-07 11:28:01 -07:00
bplist.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
bpobj.c Don't dirty bpobj if it has no entries 2017-05-26 11:42:10 -07:00
bptree.c OpenZFS 7082 - bptree_iterate() passes wrong args to zfs_dbgmsg() 2017-01-17 14:49:24 -08:00
bqueue.c Call cv_signal() with mutex held 2017-06-26 14:36:49 -07:00
dbuf_stats.c Improved dnode allocation and dmu_hold_impl() (#6611) 2017-09-13 15:46:15 -07:00
dbuf.c Fix ARC hit rate 2018-01-30 10:27:31 -06:00
ddt_zap.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
ddt.c Cache ddt_get_dedup_dspace() value if there was no ddt changes 2016-12-02 16:59:35 -07:00
dmu_diff.c OpenZFS 6950 - ARC should cache compressed data 2016-09-13 09:58:33 -07:00
dmu_object.c Improved dnode allocation and dmu_hold_impl() (#6611) 2017-09-13 15:46:15 -07:00
dmu_objset.c dmu_objset: release bonus buffer in failure path 2018-01-30 10:27:30 -06:00
dmu_send.c Fix 'zfs send/recv' hang with 16M blocks 2018-05-07 17:19:57 -07:00
dmu_traverse.c Fix hung z_zvol tasks during 'zfs receive' 2018-05-07 17:19:57 -07:00
dmu_tx.c Call commit callbacks from the tail of the list 2018-01-30 10:27:31 -06:00
dmu_zfetch.c OpenZFS 8835 - Speculative prefetch in ZFS not working for misaligned reads 2018-01-30 10:27:31 -06:00
dmu.c Fix dirty check in dmu_offset_next() 2017-11-21 13:11:29 -06:00
dnode_sync.c OpenZFS 7968 - multi-threaded spa_sync() 2017-03-20 18:36:00 -07:00
dnode.c Improved dnode allocation and dmu_hold_impl() (#6611) 2017-09-13 15:46:15 -07:00
dsl_bookmark.c OpenZFS 8377 - Panic in bookmark deletion 2017-06-30 11:11:01 -07:00
dsl_dataset.c OpenZFS 7600 - zfs rollback should pass target snapshot to kernel 2017-07-04 15:29:52 -07:00
dsl_deadlist.c OpenZFS 5428 - provide fts(), reallocarray(), and strtonum() 2017-07-08 20:35:35 -07:00
dsl_deleg.c Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -07:00
dsl_destroy.c OpenZFS 7254 - ztest failed assertion in ztest_dataset_dirobj_verify: dirobjs + 1 == usedobjs 2017-01-27 11:43:42 -08:00
dsl_dir.c Reduce stack usage of dsl_dir_tempreserve_impl 2017-06-12 11:41:03 -07:00
dsl_pool.c Multi-modifier protection (MMP) 2017-07-13 13:54:00 -04:00
dsl_prop.c Fix dsl_props_set_sync_impl to work with nested nvlist 2016-12-20 18:46:59 -08:00
dsl_scan.c OpenZFS 6939 - add sysevents to zfs core for commands 2017-07-12 21:28:13 -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 5428 - provide fts(), reallocarray(), and strtonum() 2017-07-08 20:35:35 -07:00
edonr_zfs.c DLPX-44812 integrate EP-220 large memory scalability 2016-11-29 14:34:27 -08:00
fm.c Linux 4.14 compat: CONFIG_GCC_PLUGIN_RANDSTRUCT 2017-12-04 17:21:39 -08:00
gzip.c GZIP compression offloading with QAT accelerator 2017-03-22 17:58:47 -07:00
lz4.c Fix LZ4_uncompress_unknownOutputSize caused panic 2017-05-19 13:45:46 -07:00
lzjb.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
Makefile.in Multi-modifier protection (MMP) 2017-07-13 13:54:00 -04:00
metaslab.c OpenZFS 8023 - Panic destroying a metaslab deferred range tree 2017-04-09 16:12:35 -07:00
mmp.c Update mmp_delay on sync or skipped, failed write 2018-05-07 17:19:57 -07:00
multilist.c OpenZFS 7968 - multi-threaded spa_sync() 2017-03-20 18:36:00 -07:00
pathname.c Add pn_alloc()/pn_free() functions 2016-04-21 09:49:25 -07:00
policy.c Take user namespaces into account in policy checks 2018-03-14 16:10:38 -07:00
qat_compress.c Bug fix in qat_compress.c for vmalloc addr check 2018-03-14 16:10:36 -07:00
qat_compress.h GZIP compression offloading with QAT accelerator 2017-03-22 17:58:47 -07:00
range_tree.c Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -07:00
refcount.c Linux 4.11 compat: avoid refcount_t name conflict 2017-02-28 16:10:18 -08:00
rrwlock.c Fix spelling 2017-01-03 11:31:18 -06:00
sa.c OpenZFS 8061 - sa_find_idx_tab can be declared more type-safely 2017-04-14 11:11:28 -07:00
sha256.c DLPX-44812 integrate EP-220 large memory scalability 2016-11-29 14:34:27 -08:00
skein_zfs.c DLPX-44812 integrate EP-220 large memory scalability 2016-11-29 14:34:27 -08:00
spa_boot.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
spa_config.c Remove vn_rename and vn_remove dependency 2018-03-14 16:10:36 -07:00
spa_errlog.c OpenZFS 5428 - provide fts(), reallocarray(), and strtonum() 2017-07-08 20:35:35 -07:00
spa_history.c Emit history events for 'zpool create' 2017-12-04 17:21:03 -08:00
spa_misc.c Report pool suspended due to MMP 2018-05-07 17:19:56 -07:00
spa_stats.c Record skipped MMP writes in multihost_history 2018-05-07 17:19:56 -07:00
spa.c Update mmp_delay on sync or skipped, failed write 2018-05-07 17:19:57 -07:00
space_map.c OpenZFS 8023 - Panic destroying a metaslab deferred range tree 2017-04-09 16:12:35 -07:00
space_reftree.c OpenZFS 6328 - Fix cstyle errors in zfs codebase 2017-01-12 09:42:11 -08:00
trace.c OpenZFS 6531 - Provide mechanism to artificially limit disk performance 2016-05-26 10:11:51 -07:00
txg.c OpenZFS 8063 - verify that we do not attempt to access inactive txg 2017-05-10 13:52:22 -04:00
uberblock.c Multi-modifier protection (MMP) 2017-07-13 13:54:00 -04:00
unique.c Performance optimization of AVL tree comparator functions 2016-08-31 14:35:34 -07:00
vdev_cache.c Fix wrong offset args in vdev_cache_write 2017-03-28 11:06:22 -07:00
vdev_disk.c Linux 4.14 compat: IO acct, global_page_state, etc (#6655) 2017-09-19 14:24:34 -07:00
vdev_file.c Skip spurious resilver IO on raidz vdev 2017-05-12 17:28:03 -07:00
vdev_label.c Update mmp_delay on sync or skipped, failed write 2018-05-07 17:19:57 -07:00
vdev_mirror.c vdev_mirror: load balancing fixes 2018-01-30 10:27:30 -06:00
vdev_missing.c Skip spurious resilver IO on raidz vdev 2017-05-12 17:28:03 -07:00
vdev_queue.c vdev_mirror: load balancing fixes 2018-01-30 10:27:30 -06:00
vdev_raidz_math_aarch64_neon_common.h ABD raidz NEON support 2016-11-29 14:34:33 -08:00
vdev_raidz_math_aarch64_neon.c codebase style improvements for OpenZFS 6459 port 2017-01-22 13:25:40 -08:00
vdev_raidz_math_aarch64_neonx2.c ABD raidz NEON support 2016-11-29 14:34:33 -08:00
vdev_raidz_math_avx2.c ABD raidz avx512f support 2016-11-29 14:34:33 -08:00
vdev_raidz_math_avx512bw.c ABD: Adapt avx512bw raidz assembly 2016-12-15 17:31:33 -08:00
vdev_raidz_math_avx512f.c Use cstyle -cpP in make cstyle check 2016-12-12 10:46:26 -08:00
vdev_raidz_math_impl.h codebase style improvements for OpenZFS 6459 port 2017-01-22 13:25:40 -08:00
vdev_raidz_math_scalar.c ABD Vectorized raidz 2016-11-29 14:34:33 -08:00
vdev_raidz_math_sse2.c ABD raidz avx512f support 2016-11-29 14:34:33 -08:00
vdev_raidz_math_ssse3.c codebase style improvements for OpenZFS 6459 port 2017-01-22 13:25:40 -08:00
vdev_raidz_math.c codebase style improvements for OpenZFS 6459 port 2017-01-22 13:25:40 -08:00
vdev_raidz.c Linux 4.14 compat: CONFIG_GCC_PLUGIN_RANDSTRUCT 2017-12-04 17:21:39 -08:00
vdev_root.c Skip spurious resilver IO on raidz vdev 2017-05-12 17:28:03 -07:00
vdev.c Add zfs_scan_ignore_errors tunable 2018-05-07 17:19:56 -07:00
zap_leaf.c Revert "Handle zap_add() failures in mixed ... " 2018-04-09 17:29:59 -04:00
zap_micro.c Revert "Handle zap_add() failures in mixed ... " 2018-04-09 17:29:59 -04:00
zap.c Revert "Handle zap_add() failures in mixed ... " 2018-04-09 17:29:59 -04:00
zfeature_common.c OpenZFS 2932 - support crash dumps to raidz, etc. pools 2017-04-10 10:24:17 -07:00
zfeature.c OpenZFS 6328 - Fix cstyle errors in zfs codebase 2017-01-12 09:42:11 -08:00
zfs_acl.c OpenZFS 8966 - Source file zfs_acl.c, function zfs_aclset_common contains a use after end of the lifetime of a local variable 2018-03-14 16:10:36 -07:00
zfs_byteswap.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
zfs_ctldir.c Linux 4.9 compat: fix zfs_ctldir xattr handling 2017-06-05 11:26:25 -07:00
zfs_debug.c Add line info and SET_ERROR() to ZFS debug log 2017-07-25 23:09:48 -07:00
zfs_dir.c Revert "Handle zap_add() failures in mixed ... " 2018-04-09 17:29:59 -04:00
zfs_fm.c OpenZFS 6939 - add sysevents to zfs core for commands 2017-07-12 21:28:13 -07:00
zfs_fuid.c Rename zfs_sb_t -> zfsvfs_t 2017-03-10 09:51:33 -08:00
zfs_ioctl.c Fix zfs_ioc_pool_sync should not use fnvlist 2018-01-30 10:27:30 -06:00
zfs_log.c OpenZFS 7578 - Fix/improve some aspects of ZIL writing 2017-06-09 09:15:37 -07:00
zfs_onexit.c zfsdev_getminor() should check for invalid file handles 2015-06-22 17:02:13 -07:00
zfs_replay.c Rename zfs_sb_t -> zfsvfs_t 2017-03-10 09:51:33 -08:00
zfs_rlock.c Fix spelling 2017-01-03 11:31:18 -06:00
zfs_sa.c Modifying XATTRs doesnt change the ctime 2017-09-13 16:05:18 -07:00
zfs_vfsops.c Revert "Long hold the dataset during upgrade" 2017-12-06 13:25:40 -06:00
zfs_vnops.c Fix mmap / libaio deadlock 2018-05-07 17:19:57 -07:00
zfs_znode.c Fix dnode allocation race 2017-08-08 10:17:33 -07:00
zil.c Increment zil_itx_needcopy_bytes properly 2018-03-14 16:10:38 -07:00
zio_checksum.c Remove dependency on linear ABD 2017-03-29 12:24:51 -07:00
zio_compress.c DLPX-44812 integrate EP-220 large memory scalability 2016-11-29 14:34:27 -08:00
zio_inject.c Inject zinject(8) a percentage amount of dev errs 2017-06-16 17:21:11 -07:00
zio.c Report pool suspended due to MMP 2018-05-07 17:19:56 -07:00
zle.c Fix zle_decompress out of bound access 2018-03-14 16:10:36 -07:00
zpl_ctldir.c Linux 4.12 compat: CURRENT_TIME removed 2017-05-10 09:30:48 -07:00
zpl_export.c Use cstyle -cpP in make cstyle check 2016-12-12 10:46:26 -08:00
zpl_file.c Rename zfs_sb_t -> zfsvfs_t 2017-03-10 09:51:33 -08:00
zpl_inode.c Linux 4.12 compat: CURRENT_TIME removed 2017-05-10 09:30:48 -07:00
zpl_super.c Allow mounting datasets more than once 2018-05-07 17:19:57 -07:00
zpl_xattr.c Update for cppcheck v1.80 2018-01-30 10:27:31 -06:00
zrlock.c OpenZFS 3746 - ZRLs are racy 2017-01-23 10:35:58 -08:00
zvol.c Linux compat 4.16: blk_queue_flag_{set,clear} 2018-05-07 17:19:57 -07:00