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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
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=356434
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 @@
.\" .\"
.\" $FreeBSD$ .\" $FreeBSD$
.\" .\"
.Dd October 3, 2016 .Dd January 6, 2020
.Dt FSCK_MSDOSFS 8 .Dt FSCK_MSDOSFS 8
.Os .Os
.Sh NAME .Sh NAME
@ -37,7 +37,7 @@
.Op Fl Cf .Op Fl Cf
.Ar filesystem ... .Ar filesystem ...
.Nm .Nm
.Op Fl Cny .Op Fl CMny
.Ar filesystem ... .Ar filesystem ...
.Sh DESCRIPTION .Sh DESCRIPTION
The 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. immediately in foreground, or if its cleaning can be deferred to background.
FAT (MS-DOS) file systems must always be cleaned in the foreground. FAT (MS-DOS) file systems must always be cleaned in the foreground.
A non-zero exit code is always returned for this option. 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 .It Fl f
Force Force
.Nm .Nm