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93b43af10d
freebsd-dev/module/zfs
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Seth Forshee 93b43af10d 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
2018-04-13 10:44:05 -07:00
..
abd.c Update for cppcheck v1.80 2017-11-18 14:08:00 -08:00
arc.c Fix zfs_arc_max minimum tuning 2018-04-12 10:47:32 -07:00
blkptr.c Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -07:00
bplist.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
bpobj.c Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -07:00
bptree.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
bqueue.c Call cv_signal() with mutex held 2017-06-26 14:36:49 -07:00
dbuf_stats.c Add dbuf hash and dbuf cache kstats 2018-01-29 10:24:52 -08:00
dbuf.c Fix race in dnode_check_slots_free() 2018-04-10 11:15:05 -07:00
ddt_zap.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
ddt.c Sequential scrub and resilvers 2017-11-15 17:27:01 -08:00
dmu_diff.c OpenZFS 6950 - ARC should cache compressed data 2016-09-13 09:58:33 -07:00
dmu_object.c Raw sends must be able to decrease nlevels 2018-02-02 11:43:11 -08:00
dmu_objset.c Fix race in dnode_check_slots_free() 2018-04-10 11:15:05 -07:00
dmu_send.c Fix 'zfs send/recv' hang with 16M blocks 2018-04-08 19:41:15 -07:00
dmu_traverse.c Fix hung z_zvol tasks during 'zfs receive' 2018-03-30 12:10:01 -07:00
dmu_tx.c OpenZFS 8997 - ztest assertion failure in zil_lwb_write_issue 2018-01-26 20:19:46 -08:00
dmu_zfetch.c OpenZFS 8835 - Speculative prefetch in ZFS not working for misaligned reads 2018-01-19 09:31:29 -08:00
dmu.c Fix race in dnode_check_slots_free() 2018-04-10 11:15:05 -07:00
dnode_sync.c Raw sends must be able to decrease nlevels 2018-02-02 11:43:11 -08:00
dnode.c Fix race in dnode_check_slots_free() 2018-04-10 11:15:05 -07:00
dsl_bookmark.c Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -07:00
dsl_crypt.c Raw receive should change key atomically 2018-02-21 12:31:03 -08:00
dsl_dataset.c Fix coverity defects: zfs channel programs 2018-02-20 11:19:42 -08:00
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 8677 - Open-Context Channel Programs 2018-02-08 16:05:57 -08:00
dsl_dir.c OpenZFS 7431 - ZFS Channel Programs 2018-02-08 15:28:18 -08:00
dsl_pool.c Project Quota on ZFS 2018-02-13 14:54:54 -08:00
dsl_prop.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
dsl_scan.c Fedora 28: Fix misc bounds check compiler warnings 2018-04-04 10:16:47 -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 Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -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 2017-11-28 17:33:48 -06:00
gzip.c Resolve QAT issues with incompressible data 2018-03-29 17:40:34 -07:00
hkdf.c Encryption patch follow-up 2017-10-11 16:54:48 -04:00
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 QAT support for AES-GCM 2018-03-09 13:37:15 -08:00
metaslab.c Sequential scrub and resilvers 2017-11-15 17:27:01 -08:00
mmp.c Fix divide-by-zero in mmp_delay_update() 2018-04-06 13:29:11 -07:00
multilist.c Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -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 2018-03-07 15:40:42 -08:00
qat_compress.c Resolve QAT issues with incompressible data 2018-03-29 17:40:34 -07:00
qat_crypt.c Fix spelling errors in comments 2018-03-21 08:42:13 -07:00
qat.c SHA256 QAT acceleration 2018-03-15 10:53:58 -07:00
qat.h Resolve QAT issues with incompressible data 2018-03-29 17:40:34 -07:00
range_tree.c Sequential scrub and resilvers 2017-11-15 17:27:01 -08:00
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 Project Quota on ZFS 2018-02-13 14:54:54 -08:00
sha256.c SHA256 QAT acceleration 2018-03-15 10:53:58 -07:00
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 Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -07:00
spa_errlog.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
spa_history.c Emit history events for 'zpool create' 2017-10-23 09:45:59 -07:00
spa_misc.c Fixes for SNPRINTF_BLKPTR with encrypted BP's 2018-04-06 13:30:26 -07:00
spa_stats.c Record skipped MMP writes in multihost_history 2018-03-06 15:15:15 -08:00
spa.c Update mmp_delay on sync or skipped, failed write 2018-04-04 16:38:44 -07:00
space_map.c Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -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 8585 - improve batching done in zil_commit() 2017-12-05 09:39:16 -08:00
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 Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -07:00
vdev_disk.c Fix printk() calls missing log level 2017-09-25 10:38:27 -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 2018-04-04 16:38:44 -07:00
vdev_mirror.c Linux 4.14 compat: CONFIG_GCC_PLUGIN_RANDSTRUCT 2017-11-28 17:33:48 -06:00
vdev_missing.c Skip spurious resilver IO on raidz vdev 2017-05-12 17:28:03 -07:00
vdev_queue.c Fix deadlock in IO pipeline 2018-03-16 16:46:06 -07:00
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 OpenZFS 7431 - ZFS Channel Programs 2018-02-08 15:28:18 -08:00
vdev_raidz.c Linux 4.14 compat: CONFIG_GCC_PLUGIN_RANDSTRUCT 2017-11-28 17:33:48 -06:00
vdev_root.c Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -07:00
vdev.c Add zfs_scan_ignore_errors tunable 2018-03-13 10:43:14 -07:00
zap_leaf.c Revert "Handle zap_add() failures in mixed ... " 2018-04-09 14:24:46 -07:00
zap_micro.c Revert "Handle zap_add() failures in mixed ... " 2018-04-09 14:24:46 -07:00
zap.c Revert "Handle zap_add() failures in mixed ... " 2018-04-09 14:24:46 -07:00
zcp_get.c Fix coverity defects: zfs channel programs 2018-02-20 11:19:42 -08:00
zcp_global.c OpenZFS 8600 - ZFS channel programs - snapshot 2018-02-08 15:29:24 -08:00
zcp_iter.c OpenZFS 7431 - ZFS Channel Programs 2018-02-08 15:28:18 -08:00
zcp_synctask.c Fix coverity defects: zfs channel programs 2018-02-20 11:19:42 -08:00
zcp.c OpenZFS 8677 - Open-Context Channel Programs 2018-02-08 16:05:57 -08:00
zfeature.c Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -07:00
zfs_acl.c Project Quota on ZFS 2018-02-13 14:54:54 -08:00
zfs_byteswap.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
zfs_ctldir.c Use SET_ERROR for constant non-zero return codes 2017-08-02 21:16:12 -07:00
zfs_debug.c enable zfs_dbgmsg() by default, without dprintf() 2018-03-21 15:37:32 -07:00
zfs_dir.c Revert "Handle zap_add() failures in mixed ... " 2018-04-09 14:24:46 -07:00
zfs_fm.c Decryption error handling improvements 2018-03-31 11:12:51 -07:00
zfs_fuid.c Rename zfs_sb_t -> zfsvfs_t 2017-03-10 09:51:33 -08:00
zfs_ioctl.c Fix spa reference leak in zfs_ioc_pool_scan 2018-04-03 17:31:30 -07:00
zfs_log.c Project Quota on ZFS 2018-02-13 14:54:54 -08:00
zfs_onexit.c zfsdev_getminor() should check for invalid file handles 2015-06-22 17:02:13 -07:00
zfs_ratelimit.c Change checksum & IO delay ratelimit values 2018-03-04 17:34:51 -08:00
zfs_replay.c Project Quota on ZFS 2018-02-13 14:54:54 -08:00
zfs_rlock.c Fix spelling 2017-01-03 11:31:18 -06:00
zfs_sa.c Project Quota on ZFS 2018-02-13 14:54:54 -08:00
zfs_vfsops.c ZIL claiming should not start user accounting 2018-02-20 16:27:31 -08:00
zfs_vnops.c Revert "Handle zap_add() failures in mixed ... " 2018-04-09 14:24:46 -07:00
zfs_znode.c Project Quota on ZFS 2018-02-13 14:54:54 -08:00
zil.c Increment zil_itx_needcopy_bytes properly 2018-03-02 10:01:53 -08:00
zio_checksum.c Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -07:00
zio_compress.c Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -07:00
zio_crypt.c Fix spelling errors in comments 2018-03-21 08:42:13 -07:00
zio_inject.c Undo c89 workarounds to match with upstream 2017-11-04 13:25:13 -07:00
zio.c Decryption error handling improvements 2018-03-31 11:12:51 -07:00
zle.c Fix zle_decompress out of bound access 2018-02-09 10:08:05 -08:00
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 Project Quota on ZFS 2018-02-13 14:54:54 -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 2018-04-13 10:44:05 -07:00
zpl_xattr.c Update for cppcheck v1.80 2017-11-18 14:08:00 -08:00
zrlock.c Fix race in trace point in zrl_add_impl 2018-03-12 11:27:02 -07:00
zvol.c Linux compat 4.16: blk_queue_flag_{set,clear} 2018-04-10 10:32:14 -07:00