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Support accessing .zfs/snapshot via NFS

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This patch is based on the previous work done by @andrey-ve and
@yshui.  It triggers the automount by using kern_path() to traverse
to the known snapshout mount point.  Once the snapshot is mounted
NFS can access the contents of the snapshot.

Allowing NFS clients to access to the .zfs/snapshot directory would
normally mean that a root user on a client mounting an export with
'no_root_squash' would be able to use mkdir/rmdir/mv to manipulate
snapshots on the server.  To prevent configuration mistakes a
zfs_admin_snapshot module option was added which disables the
mkdir/rmdir/mv functionally.  System administators desiring this
functionally must explicitly enable it.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2797
Closes #1655
Closes #616
This commit is contained in:
Brian Behlendorf
2015-08-28 14:54:32 -07:00
parent aa9b27080b
commit 0500e835af
3 changed files with 141 additions and 0 deletions
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module/zfs/zfs_vfsops.c
+2
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@@ -1600,6 +1600,8 @@ zfs_vget(struct super_block *sb, struct inode **ipp, fid_t *fidp)
zp_gen = zp_gen & gen_mask;
if (zp_gen == 0)
zp_gen = 1;
if ((fid_gen == 0) && (zsb->z_root == object))
fid_gen = zp_gen;
if (zp->z_unlinked || zp_gen != fid_gen) {
dprintf("znode gen (%llu) != fid gen (%llu)\n", zp_gen,
fid_gen);