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raid6check: use O_DIRECT instead of O_SYNC. 

O_DIRECT is more direct and is faster.
This requires aligned memory allocation, but that isn't hard.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2015-07-20 17:17:37 +10:00
parent eae01ef02f
commit 12ee2a8d75
1 changed files with 3 additions and 2 deletions
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5
raid6check.c
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@ -312,7 +312,7 @@ int check_stripes(struct mdinfo *info, int *source, unsigned long long *offsets,
/* read the data and p and q blocks, and check we got them right */
int data_disks = raid_disks - 2;
int syndrome_disks = data_disks + is_ddf(layout) * 2;
char *stripe_buf = xmalloc(raid_disks * chunk_size);
char *stripe_buf;
/* stripes[] is indexed by raid_disk and holds chunks from each device */
char **stripes = xmalloc(raid_disks * sizeof(char*));
@ -349,6 +349,7 @@ int check_stripes(struct mdinfo *info, int *source, unsigned long long *offsets,
if (!tables_ready)
make_tables();
posix_memalign((void**)&stripe_buf, 4096, raid_disks * chunk_size);
block_index_for_slot += 2;
blocks += 2;
blocks_page += 2;
@ -675,7 +676,7 @@ int main(int argc, char *argv[])
if(disk_slot >= 0) {
disk_name[disk_slot] = map_dev(comp->disk.major, comp->disk.minor, 0);
offsets[disk_slot] = comp->data_offset * 512;
fds[disk_slot] = open(disk_name[disk_slot], O_RDWR | O_SYNC);
fds[disk_slot] = open(disk_name[disk_slot], O_RDWR | O_DIRECT);
if (fds[disk_slot] < 0) {
perror(disk_name[disk_slot]);
fprintf(stderr,"%s: cannot open %s\n", prg, disk_name[disk_slot]);