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mount.2: Relocate/demote/rework text on MS_MGC_VAL 

The use of this constant has not been needed for 15 years now.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2016-06-04 06:54:01 -05:00
parent 49f6854626
commit 52f00c053c
1 changed files with 14 additions and 9 deletions
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23
man2/mount.2
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@ -76,15 +76,8 @@ argument supported by the kernel are listed in
Further types may become available when the appropriate modules
are loaded.
The
.I mountflags
argument may have the magic number 0xC0ED (\fBMS_MGC_VAL\fP)
in the top 16 bits (this was required in kernel versions prior to 2.4, but
is no longer required and ignored if specified),
and various mount flags
.\" (as defined in \fI<linux/fs.h>\fP for libc4 and libc5
.\" and in \fI<sys/mount.h>\fP for glibc2)
in the low order 16 bits:
The following flags may be specified in
.IR mountflags :
.\" FIXME 2.6.15 added flags for "shared subtree" functionality:
.\"
.\" MS_PRIVATE
@ -500,6 +493,18 @@ were added to glibc headers in version 2.12.
This function is Linux-specific and should not be used in
programs intended to be portable.
.SH NOTES
The
.I mountflags
argument may have the magic number 0xC0ED (\fBMS_MGC_VAL\fP)
in the top 16 bits.
(All of the other flags discussed in DESCRIPTION
occupy the low order 16 bits of
.IR mountflags .)
Specifying
.BR MS_MGC_VAL
was required in kernel versions prior to 2.4,
but since Linux 2.4 is no longer required and is ignored if specified.
The original
.B MS_SYNC
flag was renamed