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--- topics:disk-image-mount-partition [2017/03/26 05:20]
orzfly
+++ topics:disk-image-mount-partition [2017/03/26 06:15] (current)
orzfly [Mounting]
@@ Line 1: / Line 1: @@
 ====== Mount Partitions in Disk Image ======
+  * [[#losetup_partscan]]: If you have util-linux v2.21 or higher (for example, Ubuntu 16.04).
+  * [[#partprobe]]: If you have a recent kernel, and pass loop.max_part=63 on boot (if loop is built-in) or to modprobe (if loop is a module).
+  * [[#kpartx]]: ''apt install kpartx''
+  * [[#losetup_offsetsizelimit]]: AlwaysWorks™
+===== losetup partscan =====
+If you have util-linux v2.21 or higher, you can now do this with losetup. Use the -P (--partscan) option to read the partition table and create device nodes for each partition.
+  * http://stackoverflow.com/a/15200862
+==== Mounting ====
+  - Mount image as loop device<code>
+# losetup -P /dev/loop0 rpool.img
+</code>
+  - Finish<code>
+# ls /dev/loop0* -l
+brw-rw---- 1 root disk   7, 0 Mar 26 13:36 /dev/loop0
+brw-rw---- 1 root disk 259, 2 Mar 26 13:36 /dev/loop0p1
+brw-rw---- 1 root disk 259, 3 Mar 26 13:36 /dev/loop0p9
+</code>
+==== Unmounting ====
+  - Unload loop device<code>
+# losetup -d /dev/loop0
+</code>
+===== partprobe =====
+If you have a recent kernel, and pass loop.max_part=63 on boot (if loop is built-in) or to modprobe (if loop is a module).
+  * https://superuser.com/a/345476
+==== Mounting ====
+  - Mount image as loop device<code>
+# losetup /dev/loop0 rpool.img
+</code>
+  - Run partprobe<code>
+# partprobe /dev/loop0
+</code>
+  - Finish<code>
+# ls /dev/loop0* -l
+brw-rw---- 1 root disk   7, 0 Mar 26 13:23 /dev/loop0
+brw-rw---- 1 root disk 259, 0 Mar 26 13:23 /dev/loop0p1
+brw-rw---- 1 root disk 259, 1 Mar 26 13:23 /dev/loop0p9
+</code>
+==== Unmounting ====
+  - Unload loop device<code>
+# losetup -d /dev/loop0
+</code>
 ===== kpartx =====
@@ Line 19: / Line 69: @@
 </code>
   - Finish<code>
-# ls /dev/mapper -l
+# ls /dev/mapper/loop0* -l
-total 0
-crw------- 1 root root 10, 236 Feb  7 17:52 control
 lrwxrwxrwx 1 root root       7 Mar 26 13:16 loop0p1 -> ../dm-0
 lrwxrwxrwx 1 root root       7 Mar 26 13:16 loop0p9 -> ../dm-1
@@ Line 27: / Line 75: @@
 ==== Unmounting ====
   - Disconnect the device map files using kpartx<code>
@@ Line 38: / Line 85: @@
 </code>
-{{tag>disk-image loop kpartx}}
+===== losetup offset / sizelimit =====
+  * https://www.suse.com/communities/blog/accessing-file-systems-disk-block-image-files/
+==== Mounting ====
+  - Get partition details<code>
+# fdisk -l rpool.img
+Disk rpool.img: 21 GiB, 22548578304 bytes, 44040192 sectors
+Units: sectors of 1 * 512 = 512 bytes
+Sector size (logical/physical): 512 bytes / 512 bytes
+I/O size (minimum/optimal): 512 bytes / 512 bytes
+Disklabel type: gpt
+Disk identifier: B37248EB-F1D7-DA47-A42D-4C42AF20D328
+Device        Start      End  Sectors Size Type
+rpool.img1     2048 44021759 44019712  21G Solaris /usr & Apple ZFS
+rpool.img9 44021760 44038143    16384   8M Solaris reserved 1
+</code>
+  - Setup loop device<code bash>
+# losetup /dev/loop0 rpool.img --offset $((512 * 2048)) --sizelimit $((512 * 44019712))
+</code>
+==== Unmounting ====
+  - Unload loop device<code>
+# losetup -d /dev/loop0
+</code>
+{{tag>disk-image loop kpartx partprobe}}