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Code Releases Activity

explanation of md superblock location & avoid compilation warnings

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This commit is contained in:
Alasdair Kergon 2007-10-24 11:24:24 +00:00
parent 47c06763b7
commit e1d586d70e
1 changed files with 11 additions and 4 deletions

15
lib/device/dev-md.c

@ -22,7 +22,7 @@
/* Lifted from <linux/raid/md_p.h> because of difficulty including it */
#define MD_SB_MAGIC 0xa92b4efc
#define MD_RESERVED_BYTES (64 * 1024)
#define MD_RESERVED_BYTES (64 * 1024ULL)
#define MD_RESERVED_SECTORS (MD_RESERVED_BYTES / 512)
#define MD_NEW_SIZE_SECTORS(x) ((x & ~(MD_RESERVED_SECTORS - 1)) \
- MD_RESERVED_SECTORS)
@ -40,14 +40,21 @@ static int _dev_has_md_magic(struct device *dev, uint64_t sb_offset)
return 0;
}
/* FIXME Explain this algorithm */
static uint64_t _v1_sb_offset(uint64_t size, int minor_version)
/*
* Calculate the position of the superblock.
* It is always aligned to a 4K boundary and
* depending on minor_version, it can be:
* 0: At least 8K, but less than 12K, from end of device
* 1: At start of device
* 2: 4K from start of device.
*/
static uint64_t _v1_sb_offset(uint64_t size, unsigned minor_version)
{
uint64_t sb_offset;
switch(minor_version) {
case 0:
sb_offset = (size - 8 * 2) & ~(4 * 2 - 1);
sb_offset = (size - 8 * 2) & ~(4 * 2 - 1ULL);
break;
case 1:
sb_offset = 0;