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fsck_msdosfs.8: document -M.

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Reported by:	mckusick
Reviewed by:	mckusick, emaste, bcr
MFC after:	28 days
X-MFC-with:	r356313
Differential Revision:	https://reviews.freebsd.org/D23049
This commit is contained in:
Xin LI 2020-01-07 04:33:14 +00:00
parent 37fe521a6f
commit 9a67c570a9
1 changed files with 17 additions and 2 deletions
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19
sbin/fsck_msdosfs/fsck_msdosfs.8
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@ -25,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd October 3, 2016
.Dd January 6, 2020
.Dt FSCK_MSDOSFS 8
.Os
.Sh NAME
@ -37,7 +37,7 @@
.Op Fl Cf
.Ar filesystem ...
.Nm
.Op Fl Cny
.Op Fl CMny
.Ar filesystem ...
.Sh DESCRIPTION
The
@ -84,6 +84,21 @@ which seeks to determine whether the file system needs to be cleaned
immediately in foreground, or if its cleaning can be deferred to background.
FAT (MS-DOS) file systems must always be cleaned in the foreground.
A non-zero exit code is always returned for this option.
.It Fl M
Causes
.Nm
to not use
.Xr mmap 2
when checking a FAT32 file system.
This option is mainly for debugging purposes and is not normally necessary.
The
.Nm
utility will automatically fall back to use a simple LRU cache of 4 MiB
when it failed to perform
.Xr mmap 2 ,
or when
.Fl M
is specified.
.It Fl f
Force
.Nm