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Added to MNT_FORCE option description after seeing Bruce's commit message

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dealing w/the fixit floppy.
Also added the MNT_RELOAD, MNT_WANTRDWR, MNT_ASYNC, MNT_NOATIME,
MOUNT_UNION flags.  Someone might want to check my description of MNT_RELOAD.

2.2-R candidate.  Not a 2.1.6-R candidate -- some current flags aren't in
2.1.5-R's version.
This commit is contained in:
obrien 1996-11-10 05:56:43 +00:00
parent e15ba7df33
commit 7d9f6cd5a3
1 changed files with 24 additions and 3 deletions
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27
lib/libc/sys/mount.2
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@ -83,10 +83,17 @@ Even the super-user may not write on it.
Do not allow files to be executed from the filesystem.
.It Dv MNT_NOSUID
Do not honor setuid or setgid bits on files when executing them.
.It Dv MNT_NOATIME
Disable update of file access times.
.It Dv MNT_NODEV
Do not interpret special files on the filesystem.
.It Dv MNT_SYNCHRONOUS
All I/O to the filesystem should be done synchronously.
.It Dv MNT_ASYNC
All I/O to the filesystem should be done asynchronously.
.It Dv MNT_WANTRDWR
Upgrade a mounted read-only filesystem to read-write if MNT_UPDATE
is also specified.
.El
.Pp
The flag
@ -97,7 +104,12 @@ This allows the mount flags to be changed without requiring
that the filesystem be unmounted and remounted.
Some filesystems may not allow all flags to be changed.
For example,
most filesystems will not allow a change from read-write to read-only.
many filesystems will not allow a change from read-write to read-only.
.Pp
The flag
.Dv MNT_RELOAD
causes the vfs subsystem to update its data structures pertaining to
the specified already mounted filesystem.
.Pp
The
.Fa type
@ -142,6 +154,14 @@ struct mfs_args {
};
.Ed
.Pp
.Dv MOUNT_UNION
.Bd -literal -offset indent -compact
struct union_args {
char *target; /* Target of loopback */
int mntflags; /* Options on the mount */
};
.Ed
.Pp
The
.Fn umount
function call disassociates the filesystem from the specified
@ -152,8 +172,9 @@ The
.Fa flags
argument may specify
.Dv MNT_FORCE
to specify that the filesystem should be forcibly unmounted even if files are
still active.
to specify that the filesystem should be forcibly unmounted or made read-only
(if MNT_UPDATE and MNT_RDONLY are also specified)
even if files are still active.
Active special devices continue to work,
but any further accesses to any other active files result in errors
even if the filesystem is later remounted.