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authorOlaf Hering <olh@suse.de>2007-02-10 04:45:47 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 13:51:31 -0500
commit4419d1ac7def3c2f74cab15e4a1c69cffcaadedd (patch)
treeadeb2b715cbd53d94cf71127f4b4bd19d5544cd5 /fs/partitions
parentaa58d61d18b89b98521364550b481fd9bd18c3b6 (diff)
[PATCH] relax check for AIX in msdos partition table
The patch to identify AIX disks and ignore them has caused at least one machine to fail to find the root partition on 2.6.19. The patch is: http://lkml.org/lkml/2006/7/31/117 The problem is some disk formatters do not blow away the first 4 bytes of the disk. If the disk we are installing to used to have AIX on it, then the first 4 bytes will still have IBMA in EBCDIC. The install in question was debian etch. Im not sure what the best fix is, perhaps the AIX detection code could check more than the first 4 bytes. The whole partition info for primary partitions is in this block: dd if=/dev/sdb count=$(( 4 * 16 )) bs=1 skip=$(( 0x1be )) All other data do not matter, beside the 0x55aa marker at the end of the first block. Signed-off-by: Olaf Hering <olh@suse.de> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Anton Blanchard <anton@samba.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/partitions')
-rw-r--r--fs/partitions/msdos.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/fs/partitions/msdos.c b/fs/partitions/msdos.c
index 8c7af1777819..dafd3b6b2dc3 100644
--- a/fs/partitions/msdos.c
+++ b/fs/partitions/msdos.c
@@ -63,15 +63,25 @@ msdos_magic_present(unsigned char *p)
63#define AIX_LABEL_MAGIC4 0xC1 63#define AIX_LABEL_MAGIC4 0xC1
64static int aix_magic_present(unsigned char *p, struct block_device *bdev) 64static int aix_magic_present(unsigned char *p, struct block_device *bdev)
65{ 65{
66 struct partition *pt = (struct partition *) (p + 0x1be);
66 Sector sect; 67 Sector sect;
67 unsigned char *d; 68 unsigned char *d;
68 int ret = 0; 69 int slot, ret = 0;
69 70
70 if (p[0] != AIX_LABEL_MAGIC1 && 71 if (p[0] != AIX_LABEL_MAGIC1 &&
71 p[1] != AIX_LABEL_MAGIC2 && 72 p[1] != AIX_LABEL_MAGIC2 &&
72 p[2] != AIX_LABEL_MAGIC3 && 73 p[2] != AIX_LABEL_MAGIC3 &&
73 p[3] != AIX_LABEL_MAGIC4) 74 p[3] != AIX_LABEL_MAGIC4)
74 return 0; 75 return 0;
76 /* Assume the partition table is valid if Linux partitions exists */
77 for (slot = 1; slot <= 4; slot++, pt++) {
78 if (pt->sys_ind == LINUX_SWAP_PARTITION ||
79 pt->sys_ind == LINUX_RAID_PARTITION ||
80 pt->sys_ind == LINUX_DATA_PARTITION ||
81 pt->sys_ind == LINUX_LVM_PARTITION ||
82 is_extended_partition(pt))
83 return 0;
84 }
75 d = read_dev_sector(bdev, 7, &sect); 85 d = read_dev_sector(bdev, 7, &sect);
76 if (d) { 86 if (d) {
77 if (d[0] == '_' && d[1] == 'L' && d[2] == 'V' && d[3] == 'M') 87 if (d[0] == '_' && d[1] == 'L' && d[2] == 'V' && d[3] == 'M')