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super0: Do all metadata IO with 4096byte alignment 

.. because some devices (dasd) have 4096 byte sector size.

As the superblock is 4096 bytes and the bitmap is in a
60K region, this is safe from any possible corruption.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2009-03-09 10:16:17 +11:00
parent fabf4941b1
commit b550887f72
1 changed files with 14 additions and 11 deletions
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25
super0.c
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@ -545,7 +545,8 @@ static int init_super0(struct supertype *st, mdu_array_info_t *info,
mdp_super_t *sb;
int spares;
if (posix_memalign((void**)&sb, 512, MD_SB_BYTES + sizeof(bitmap_super_t)) != 0) {
if (posix_memalign((void**)&sb, 4096,
MD_SB_BYTES + ROUND_UP(sizeof(bitmap_super_t), 4096)) != 0) {
fprintf(stderr, Name ": %s could not allocate superblock\n", __func__);
return 0;
}
@ -682,8 +683,8 @@ static int store_super0(struct supertype *st, int fd)
if (super->state & (1<<MD_SB_BITMAP_PRESENT)) {
struct bitmap_super_s * bm = (struct bitmap_super_s*)(super+1);
if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC)
if (write(fd, bm, ROUND_UP(sizeof(*bm),512)) !=
ROUND_UP(sizeof(*bm),512))
if (write(fd, bm, ROUND_UP(sizeof(*bm),4096)) !=
ROUND_UP(sizeof(*bm),4096))
return 5;
}
@ -743,8 +744,9 @@ static int compare_super0(struct supertype *st, struct supertype *tst)
if (second->md_magic != MD_SB_MAGIC)
return 1;
if (!first) {
if (posix_memalign((void**)&first, 512,
MD_SB_BYTES + sizeof(struct bitmap_super_s)) != 0) {
if (posix_memalign((void**)&first, 4096,
MD_SB_BYTES +
ROUND_UP(sizeof(struct bitmap_super_s), 4096)) != 0) {
fprintf(stderr, Name
": %s could not allocate superblock\n", __func__);
return 1;
@ -817,8 +819,9 @@ static int load_super0(struct supertype *st, int fd, char *devname)
return 1;
}
if (posix_memalign((void**)&super, 512,
MD_SB_BYTES + sizeof(bitmap_super_t)+512) != 0) {
if (posix_memalign((void**)&super, 4096,
MD_SB_BYTES +
ROUND_UP(sizeof(bitmap_super_t), 4096)) != 0) {
fprintf(stderr, Name
": %s could not allocate superblock\n", __func__);
return 1;
@ -866,8 +869,8 @@ static int load_super0(struct supertype *st, int fd, char *devname)
* valid. If it doesn't clear the bit. An --assemble --force
* should get that written out.
*/
if (read(fd, super+1, ROUND_UP(sizeof(struct bitmap_super_s),512))
!= ROUND_UP(sizeof(struct bitmap_super_s),512))
if (read(fd, super+1, ROUND_UP(sizeof(struct bitmap_super_s),4096))
!= ROUND_UP(sizeof(struct bitmap_super_s),4096))
goto no_bitmap;
uuid_from_super0(st, uuid);
@ -998,8 +1001,8 @@ static int write_bitmap0(struct supertype *st, int fd)
int rv = 0;
int towrite, n;
char abuf[4096+512];
char *buf = (char*)(((long)(abuf+512))&~511UL);
char abuf[4096+4096];
char *buf = (char*)(((long)(abuf+4096))&~4095L);
if (!get_dev_size(fd, NULL, &dsize))
return 1;