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authorChunwei Chen <[email protected]>2017-03-08 09:26:33 -0800
committerBrian Behlendorf <[email protected]>2017-03-08 09:26:33 -0800
commit9b77d1c9585572b7ce3af204d40278752d5f5842 (patch)
treef833d83cdede67ba1a43f1729caa64ebf899a00a /man/man8/zfs.8
parent463009865fb4398b32a825d7c00cd8a942637fae (diff)
Fix nfs snapdir automount
The current implementation for allowing nfs to access snapdir is very buggy. It uses a special fh for snapdirs, such that the next time nfsd does fh_to_dentry, it actually returns the root inode inside the snapshot. So nfsd never knows it cross a mountpoint. The problem is that nfsd will not hold a reference on the vfsmount of the snapshot. This cause auto unmounter to unmount the snapshot even though nfs is still holding dentries in it. To fix this, we return the inode for the snapdirs themselves. However, we also trigger automount upon fh_to_dentry, and return ESTALE so nfsd will revalidate and see the mountpoint and do crossmnt. Because nfsd will now be aware that these are different filesystems users must add crossmnt to their export options to access snapshot directories. Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Chunwei Chen <[email protected]> Closes #3794 Closes #4716 Closes #5810 Closes #5833
Diffstat (limited to 'man/man8/zfs.8')
-rw-r--r--man/man8/zfs.86
1 files changed, 5 insertions, 1 deletions
diff --git a/man/man8/zfs.8 b/man/man8/zfs.8
index 0f9a631d9..888a5f8eb 100644
--- a/man/man8/zfs.8
+++ b/man/man8/zfs.8
@@ -1340,7 +1340,7 @@ Controls whether the file system is shared via \fBNFS\fR, and what options are u
.sp
.in +4
.nf
-/usr/sbin/exportfs -i -o sec=sys,rw,no_subtree_check,no_root_squash,mountpoint *:<mountpoint of dataset>
+/usr/sbin/exportfs -i -o sec=sys,rw,crossmnt,no_subtree_check,no_root_squash,mountpoint *:<mountpoint of dataset>
.fi
.in -4
.sp
@@ -3746,6 +3746,10 @@ The following commands show how to set \fBsharenfs\fR property options to enable
.LP
If you are using \fBDNS\fR for host name resolution, specify the fully qualified hostname.
+.sp
+.LP
+If you want to access snapdir through NFS, be sure to add \fBcrossmnt\fR to the options.
+
.LP
\fBExample 17 \fRDelegating ZFS Administration Permissions on a ZFS Dataset
.sp