md: Make mddev->size sector-based.
This patch renames the "size" field of struct mddev_s to "dev_sectors"
and stores the number of 512-byte sectors instead of the number of
1K-blocks in it.
All users of that field, including raid levels 1,4-6,10, are adjusted
accordingly. This simplifies the code a bit because it allows to get
rid of a couple of divisions/multiplications by two.
In order to make checkpatch happy, some minor coding style issues
have also been addressed. In particular, size_store() now uses
strict_strtoull() instead of simple_strtoull().
Signed-off-by: Andre Noll <maan@systemlinux.org>
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index b2c00ce..be4a131 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -816,7 +816,7 @@
mddev->clevel[0] = 0;
mddev->layout = sb->layout;
mddev->raid_disks = sb->raid_disks;
- mddev->size = sb->size;
+ mddev->dev_sectors = sb->size * 2;
mddev->events = ev1;
mddev->bitmap_offset = 0;
mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
@@ -930,7 +930,7 @@
sb->ctime = mddev->ctime;
sb->level = mddev->level;
- sb->size = mddev->size;
+ sb->size = mddev->dev_sectors / 2;
sb->raid_disks = mddev->raid_disks;
sb->md_minor = mddev->md_minor;
sb->not_persistent = 0;
@@ -1028,7 +1028,7 @@
static unsigned long long
super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
{
- if (num_sectors && num_sectors < rdev->mddev->size * 2)
+ if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
return 0; /* component must fit device */
if (rdev->mddev->bitmap_offset)
return 0; /* can't move bitmap */
@@ -1220,7 +1220,7 @@
mddev->clevel[0] = 0;
mddev->layout = le32_to_cpu(sb->layout);
mddev->raid_disks = le32_to_cpu(sb->raid_disks);
- mddev->size = le64_to_cpu(sb->size)/2;
+ mddev->dev_sectors = le64_to_cpu(sb->size);
mddev->events = ev1;
mddev->bitmap_offset = 0;
mddev->default_bitmap_offset = 1024 >> 9;
@@ -1316,7 +1316,7 @@
sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
sb->raid_disks = cpu_to_le32(mddev->raid_disks);
- sb->size = cpu_to_le64(mddev->size<<1);
+ sb->size = cpu_to_le64(mddev->dev_sectors);
if (mddev->bitmap && mddev->bitmap_file == NULL) {
sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
@@ -1374,7 +1374,7 @@
{
struct mdp_superblock_1 *sb;
sector_t max_sectors;
- if (num_sectors && num_sectors < rdev->mddev->size * 2)
+ if (num_sectors && num_sectors < rdev->mddev->dev_sectors)
return 0; /* component must fit device */
if (rdev->sb_start < rdev->data_offset) {
/* minor versions 1 and 2; superblock before data */
@@ -1490,8 +1490,9 @@
if (find_rdev(mddev, rdev->bdev->bd_dev))
return -EEXIST;
- /* make sure rdev->size exceeds mddev->size */
- if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
+ /* make sure rdev->size exceeds mddev->dev_sectors / 2 */
+ if (rdev->size && (mddev->dev_sectors == 0 ||
+ rdev->size < mddev->dev_sectors / 2)) {
if (mddev->pers) {
/* Cannot change size, so fail
* If mddev->level <= 0, then we don't care
@@ -1500,7 +1501,7 @@
if (mddev->level > 0)
return -ENOSPC;
} else
- mddev->size = rdev->size;
+ mddev->dev_sectors = rdev->size * 2;
}
/* Verify rdev->desc_nr is unique.
@@ -2243,7 +2244,7 @@
size -= rdev->data_offset/2;
}
}
- if (size < my_mddev->size)
+ if (size < my_mddev->dev_sectors / 2)
return -EINVAL; /* component must fit device */
rdev->size = size;
@@ -2809,7 +2810,7 @@
else {
if (list_empty(&mddev->disks) &&
mddev->raid_disks == 0 &&
- mddev->size == 0)
+ mddev->dev_sectors == 0)
st = clear;
else
st = inactive;
@@ -3016,7 +3017,8 @@
static ssize_t
size_show(mddev_t *mddev, char *page)
{
- return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
+ return sprintf(page, "%llu\n",
+ (unsigned long long)mddev->dev_sectors / 2);
}
static int update_size(mddev_t *mddev, sector_t num_sectors);
@@ -3028,20 +3030,19 @@
* not increase it (except from 0).
* If array is active, we can try an on-line resize
*/
- char *e;
- int err = 0;
- unsigned long long size = simple_strtoull(buf, &e, 10);
- if (!*buf || *buf == '\n' ||
- (*e && *e != '\n'))
- return -EINVAL;
+ unsigned long long sectors;
+ int err = strict_strtoull(buf, 10, §ors);
+ if (err < 0)
+ return err;
+ sectors *= 2;
if (mddev->pers) {
- err = update_size(mddev, size * 2);
+ err = update_size(mddev, sectors);
md_update_sb(mddev, 1);
} else {
- if (mddev->size == 0 ||
- mddev->size > size)
- mddev->size = size;
+ if (mddev->dev_sectors == 0 ||
+ mddev->dev_sectors > sectors)
+ mddev->dev_sectors = sectors;
else
err = -ENOSPC;
}
@@ -3306,15 +3307,15 @@
static ssize_t
sync_completed_show(mddev_t *mddev, char *page)
{
- unsigned long max_blocks, resync;
+ unsigned long max_sectors, resync;
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
- max_blocks = mddev->resync_max_sectors;
+ max_sectors = mddev->resync_max_sectors;
else
- max_blocks = mddev->size << 1;
+ max_sectors = mddev->dev_sectors;
resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
- return sprintf(page, "%lu / %lu\n", resync, max_blocks);
+ return sprintf(page, "%lu / %lu\n", resync, max_sectors);
}
static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
@@ -3789,11 +3790,11 @@
/* perform some consistency tests on the device.
* We don't want the data to overlap the metadata,
- * Internal Bitmap issues has handled elsewhere.
+ * Internal Bitmap issues have been handled elsewhere.
*/
if (rdev->data_offset < rdev->sb_start) {
- if (mddev->size &&
- rdev->data_offset + mddev->size*2
+ if (mddev->dev_sectors &&
+ rdev->data_offset + mddev->dev_sectors
> rdev->sb_start) {
printk("md: %s: data overlaps metadata\n",
mdname(mddev));
@@ -3875,7 +3876,9 @@
}
mddev->recovery = 0;
- mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
+ /* may be over-ridden by personality */
+ mddev->resync_max_sectors = mddev->dev_sectors;
+
mddev->barriers_work = 1;
mddev->ok_start_degraded = start_dirty_degraded;
@@ -4131,7 +4134,7 @@
export_array(mddev);
mddev->array_sectors = 0;
- mddev->size = 0;
+ mddev->dev_sectors = 0;
mddev->raid_disks = 0;
mddev->recovery_cp = 0;
mddev->resync_min = 0;
@@ -4337,8 +4340,8 @@
info.patch_version = MD_PATCHLEVEL_VERSION;
info.ctime = mddev->ctime;
info.level = mddev->level;
- info.size = mddev->size;
- if (info.size != mddev->size) /* overflow */
+ info.size = mddev->dev_sectors / 2;
+ if (info.size != mddev->dev_sectors / 2) /* overflow */
info.size = -1;
info.nr_disks = nr;
info.raid_disks = mddev->raid_disks;
@@ -4788,7 +4791,7 @@
mddev->level = info->level;
mddev->clevel[0] = 0;
- mddev->size = info->size;
+ mddev->dev_sectors = 2 * (sector_t)info->size;
mddev->raid_disks = info->raid_disks;
/* don't set md_minor, it is determined by which /dev/md* was
* openned
@@ -4926,12 +4929,18 @@
)
return -EINVAL;
/* Check there is only one change */
- if (info->size >= 0 && mddev->size != info->size) cnt++;
- if (mddev->raid_disks != info->raid_disks) cnt++;
- if (mddev->layout != info->layout) cnt++;
- if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
- if (cnt == 0) return 0;
- if (cnt > 1) return -EINVAL;
+ if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
+ cnt++;
+ if (mddev->raid_disks != info->raid_disks)
+ cnt++;
+ if (mddev->layout != info->layout)
+ cnt++;
+ if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT))
+ cnt++;
+ if (cnt == 0)
+ return 0;
+ if (cnt > 1)
+ return -EINVAL;
if (mddev->layout != info->layout) {
/* Change layout
@@ -4943,7 +4952,7 @@
else
return mddev->pers->reconfig(mddev, info->layout, -1);
}
- if (info->size >= 0 && mddev->size != info->size)
+ if (info->size >= 0 && mddev->dev_sectors / 2 != info->size)
rv = update_size(mddev, (sector_t)info->size * 2);
if (mddev->raid_disks != info->raid_disks)
@@ -5443,7 +5452,7 @@
if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
max_blocks = mddev->resync_max_sectors >> 1;
else
- max_blocks = mddev->size;
+ max_blocks = mddev->dev_sectors / 2;
/*
* Should not happen.
@@ -6019,10 +6028,10 @@
j = mddev->recovery_cp;
} else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
- max_sectors = mddev->size << 1;
+ max_sectors = mddev->dev_sectors;
else {
/* recovery follows the physical size of devices */
- max_sectors = mddev->size << 1;
+ max_sectors = mddev->dev_sectors;
j = MaxSector;
list_for_each_entry(rdev, &mddev->disks, same_set)
if (rdev->raid_disk >= 0 &&