forked from luck/tmp_suning_uos_patched
1493bf217f
Make the following changes to partition check code. * Add ->bdev to struct parsed_partitions. * Introduce read_part_sector() which is a simple wrapper around read_dev_sector() which takes struct parsed_partitions *state instead of @bdev. * For functions which used to take @state and @bdev, drop @bdev. For functions which used to take @bdev, replace it with @state. * While updating, drop superflous checks on NULL state/bdev in ldm.c. This cleans up the API a bit and enables better handling of IO errors during partition check as the generic partition check code now has much better visibility into what went wrong in the low level code paths. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Ben Hutchings <ben@decadent.org.uk> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/*
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* fs/partitions/sgi.c
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*
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* Code extracted from drivers/block/genhd.c
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*/
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#include "check.h"
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#include "sgi.h"
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struct sgi_disklabel {
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__be32 magic_mushroom; /* Big fat spliff... */
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__be16 root_part_num; /* Root partition number */
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__be16 swap_part_num; /* Swap partition number */
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s8 boot_file[16]; /* Name of boot file for ARCS */
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u8 _unused0[48]; /* Device parameter useless crapola.. */
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struct sgi_volume {
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s8 name[8]; /* Name of volume */
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__be32 block_num; /* Logical block number */
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__be32 num_bytes; /* How big, in bytes */
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} volume[15];
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struct sgi_partition {
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__be32 num_blocks; /* Size in logical blocks */
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__be32 first_block; /* First logical block */
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__be32 type; /* Type of this partition */
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} partitions[16];
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__be32 csum; /* Disk label checksum */
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__be32 _unused1; /* Padding */
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};
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int sgi_partition(struct parsed_partitions *state)
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{
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int i, csum;
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__be32 magic;
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int slot = 1;
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unsigned int start, blocks;
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__be32 *ui, cs;
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Sector sect;
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struct sgi_disklabel *label;
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struct sgi_partition *p;
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char b[BDEVNAME_SIZE];
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label = read_part_sector(state, 0, §);
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if (!label)
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return -1;
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p = &label->partitions[0];
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magic = label->magic_mushroom;
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if(be32_to_cpu(magic) != SGI_LABEL_MAGIC) {
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/*printk("Dev %s SGI disklabel: bad magic %08x\n",
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bdevname(bdev, b), be32_to_cpu(magic));*/
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put_dev_sector(sect);
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return 0;
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}
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ui = ((__be32 *) (label + 1)) - 1;
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for(csum = 0; ui >= ((__be32 *) label);) {
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cs = *ui--;
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csum += be32_to_cpu(cs);
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}
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if(csum) {
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printk(KERN_WARNING "Dev %s SGI disklabel: csum bad, label corrupted\n",
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bdevname(state->bdev, b));
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put_dev_sector(sect);
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return 0;
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}
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/* All SGI disk labels have 16 partitions, disks under Linux only
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* have 15 minor's. Luckily there are always a few zero length
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* partitions which we don't care about so we never overflow the
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* current_minor.
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*/
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for(i = 0; i < 16; i++, p++) {
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blocks = be32_to_cpu(p->num_blocks);
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start = be32_to_cpu(p->first_block);
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if (blocks) {
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put_partition(state, slot, start, blocks);
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if (be32_to_cpu(p->type) == LINUX_RAID_PARTITION)
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state->parts[slot].flags = ADDPART_FLAG_RAID;
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}
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slot++;
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}
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printk("\n");
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put_dev_sector(sect);
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return 1;
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}
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