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Fix automount for root filesystems

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Commit 093bb64 resolved an automount failures for chroot'd processes
but inadvertently broke automounting for root filesystems where the
vfs_mntpoint is NULL.  Resolve the issue by checking for NULL in order
to generate the correct path.

Reviewed-by: Tom Caputi <tcaputi@datto.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #9381
Closes #9384
This commit is contained in:
Brian Behlendorf 2019-10-04 12:30:51 -07:00 committed by GitHub
parent 2cc479d049
commit 6bd4f4545d
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1 changed files with 2 additions and 1 deletions
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3
module/os/linux/zfs/zfs_ctldir.c
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@ -1053,7 +1053,8 @@ zfsctl_snapshot_mount(struct path *path, int flags)
* on mount.zfs(8).
*/
snprintf(full_path, MAXPATHLEN, "%s/.zfs/snapshot/%s",
zfsvfs->z_vfs->vfs_mntpoint, dname(dentry));
zfsvfs->z_vfs->vfs_mntpoint ? zfsvfs->z_vfs->vfs_mntpoint : "",
dname(dentry));
/*
* Multiple concurrent automounts of a snapshot are never allowed.