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head/sbin/mount/mount.8
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indicate that the status of an already mounted file system should be changed. | indicate that the status of an already mounted file system should be changed. | ||||
.It Cm union | .It Cm union | ||||
Causes the namespace at the mount point to appear as the union | Causes the namespace at the mount point to appear as the union | ||||
of the mounted file system root and the existing directory. | of the mounted file system root and the existing directory. | ||||
Lookups will be done in the mounted file system first. | Lookups will be done in the mounted file system first. | ||||
If those operations fail due to a non-existent file the underlying | If those operations fail due to a non-existent file the underlying | ||||
directory is then accessed. | directory is then accessed. | ||||
All creates are done in the mounted file system. | All creates are done in the mounted file system. | ||||
.It Cm untrusted | |||||
The file system is untrusted and the kernel should use more | |||||
extensive checks on the file-system's metadata before using it. | |||||
This option is intended to be used when mounting file systems | |||||
from untrusted media such as USB memory sticks or other | |||||
externally-provided media. | |||||
.El | .El | ||||
.Pp | .Pp | ||||
Any additional options specific to a file system type that is not | Any additional options specific to a file system type that is not | ||||
one of the internally known types (see the | one of the internally known types (see the | ||||
.Fl t | .Fl t | ||||
option) may be passed as a comma separated list; these options are | option) may be passed as a comma separated list; these options are | ||||
distinguished by a leading | distinguished by a leading | ||||
.Dq \&- | .Dq \&- | ||||
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