[DragonFlyBSD - Submit #3099] (New) disklabel64: Fix partition 1MiB phsycial alignment; with other minor updates and cleanups

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Issue #3099 has been reported by liweitianux.

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Submit #3099: disklabel64: Fix partition 1MiB phsycial alignment; with other minor updates and cleanups
http://bugs.dragonflybsd.org/issues/3099

* Author: liweitianux
* Status: New
* Priority: Normal
* Assignee: 
* Category: Kernel
* Target version: 
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Hello,

According to disklabel64(8), the partitions within a slice are physically aligned to 1MiB (PALIGN_SIZE).  However, there is a mistake in l64_makevirginlabel() in kern/subr_disklabel64.c, which causes the partitions are actually only 32KiB aligned.  The proposed patches here fix this issue, and introduce some more updates and cleanups:

* Calculate d_pbase and d_pstop to make them both physically aligned to 1MiB;
* Defined BOOT2SIZE64 in sys/disklabel64.h to replace the use of 32768;
* Reserve space for the backup label at the slice end (after d_pstop), though the backup functionality not implemented;
* Make the "auto" disk type optional, since the disk type support is not implement;
* Update several comments, displayed disklabel descriptions;
* Fix two compilation warnings due to the mismatched type in strncpy();
* Add "static" keyword; cleanup unused variables and definitions.

I also pushed these patches to my GitHub at:
https://github.com/liweitianux/dragonflybsd/tree/disklabel

Here is a comparison of the virgin labels generated:

diskinfo:
/dev/ad4s1       blksize=512  offset=0x000000007e00 size=0x002543158200  149.05 GB

Before:
------------------------------------------------------------------------------
# boot space:    1044992 bytes
# data space:  156287323 blocks # 152624.34 MB (160038219264 bytes)

boot2 data base:      0x000000001000
partitions data base: 0x000000100200
partitions data stop: 0x002543157000
backup label:         0x002543157000
total size:           0x002543158200    # 152625.34 MB
------------------------------------------------------------------------------

After:
------------------------------------------------------------------------------
# boot space:    1012224 bytes
# data space:  156286976 blocks # 152624.00 MB (160037863424 bytes)

boot2 data base:      0x000000001000
partitions data base: 0x0000000f8200
partitions data stop: 0x0025430f8200
backup label:         0x0025430f8200
total size:           0x002543158200    # 152625.34 MB
------------------------------------------------------------------------------

Thanks for reviewing these patches.

Aly

---Files--------------------------------
0001-sys-disklabel64.h-Define-BOOT2SIZE64-to-32-KB-for-bo.patch (3.76 KB)
0002-kern-disklabel64-Fix-physically-alignment-to-1-MiB-f.patch (4.83 KB)
0003-disklabel64-8-Clean-up-unused-definitions-and-variab.patch (3.98 KB)
0004-disklabel64-8-Fix-error-message-to-indicate-no-disk-.patch (941 Bytes)
0005-disklabel64-8-Make-the-auto-disk-type-argument-optio.patch (2.25 KB)
0006-disklabel64-8-Update-displayed-label-comments-and-an.patch (2.23 KB)
0007-disklabel64-8-Add-various-static-keyword-Fix-compila.patch (7.81 KB)
0008-disklabel64-8-free-allocated-boot1buf-on-error.patch (976 Bytes)
0009-diskinfo-8-Print-0x-prefix-for-hex-numbers-Change-of.patch (1.07 KB)


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