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| author | Karel Zak | 2010-03-15 17:10:35 +0100 |
|---|---|---|
| committer | Karel Zak | 2010-03-15 17:10:35 +0100 |
| commit | e580266914734898999f652025f9c7141023df66 (patch) | |
| tree | c2e96758fdc64e3a0a9f170466e8134f4a6ec95a /mount/mount.8 | |
| parent | mount: more explicitly explain fstab usage in mount.8 (diff) | |
| download | kernel-qcow2-util-linux-e580266914734898999f652025f9c7141023df66.tar.gz kernel-qcow2-util-linux-e580266914734898999f652025f9c7141023df66.tar.xz kernel-qcow2-util-linux-e580266914734898999f652025f9c7141023df66.zip | |
mount: automatically detect and loop-mount regular files
This patch allows to automatically create a loop device from a regular
file if a filesystem type is not specified, for example:
mount /path/disk.img /mnt
If the filesystem type is specified than "-o loop" is required.
Note that there is not a restriction (on kernel side) that prevents
regular file as a mount(2) source argument. A filesystem that is able
to mount regular files could be implemented.
Based on a patch from Adam Jackson <ajax@redhat.com>.
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'mount/mount.8')
| -rw-r--r-- | mount/mount.8 | 36 |
1 files changed, 25 insertions, 11 deletions
diff --git a/mount/mount.8 b/mount/mount.8 index 07edb5c22..9675cc62d 100644 --- a/mount/mount.8 +++ b/mount/mount.8 @@ -2536,18 +2536,37 @@ Since Linux version 2.1.21 xiafs is no longer part of the kernel source. .SH "THE LOOP DEVICE" One further possible type is a mount via the loop device. For example, the command - -.nf -.B " mount /tmp/fdimage /mnt -t vfat -o loop=/dev/loop3 -.fi - +.RS +.sp +.B "mount /tmp/disk.img /mnt -t vfat -o loop=/dev/loop" +.sp +.RE will set up the loop device .I /dev/loop3 to correspond to the file -.IR /tmp/fdimage , +.IR /tmp/disk.img , and then mount this device on .IR /mnt . +If no explicit loop device is mentioned +(but just an option `\fB\-o loop\fP' is given), then +.B mount +will try to find some unused loop device and use that, for example +.RS +.sp +.B "mount /tmp/disk.img /mnt -o loop" +.sp +.RE +The mount command +.B automatically +creates a loop device from a regular file if a filesystem type is +not specified, for example: +.RS +.sp +.B "mount /tmp/disk.img /mnt" +.sp +.RE + This type of mount knows about four options, namely .BR loop ", " offset ", " sizelimit " and " encryption , that are really options to @@ -2555,11 +2574,6 @@ that are really options to (These options can be used in addition to those specific to the filesystem type.) -If no explicit loop device is mentioned -(but just an option `\fB\-o loop\fP' is given), then -.B mount -will try to find some unused loop device and use that. - Since Linux 2.6.25 is supported auto-destruction of loop devices and then any loop device allocated by .B mount |