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/bitmap.c b/drivers/md/bitmap.c
index 5d64da9..f8a9f7a 100644 (file)
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -298,7 +298,7 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
                                    + size/512 > 0)
                                        /* bitmap runs in to metadata */
                                        goto bad_alignment;
-                               if (rdev->data_offset + mddev->size*2
+                               if (rdev->data_offset + mddev->dev_sectors
                                    > rdev->sb_start + bitmap->offset)
                                        /* data runs in to bitmap */
                                        goto bad_alignment;

diff --git a/drivers/md/faulty.c b/drivers/md/faulty.c
index 7b66b9f..18793c1 100644 (file)
--- a/drivers/md/faulty.c
+++ b/drivers/md/faulty.c
@@ -301,7 +301,7 @@ static int run(mddev_t *mddev)
        list_for_each_entry(rdev, &mddev->disks, same_set)
                conf->rdev = rdev;
 
-       mddev->array_sectors = mddev->size * 2;
+       mddev->array_sectors = mddev->dev_sectors;
        mddev->private = conf;
 
        reconfig(mddev, mddev->layout, -1);

diff --git a/drivers/md/md.c b/drivers/md/md.c
index b2c00ce..be4a131 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -816,7 +816,7 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
                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 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
 
        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 void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
 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 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
                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 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
        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 @@ super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
 {
        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 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
        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 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
                        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 @@ rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
                        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 @@ array_state_show(mddev_t *mddev, char *page)
        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 @@ __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
 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 @@ size_store(mddev_t *mddev, const char *buf, size_t len)
         * 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, &sectors);
 
+       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 struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
 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 @@ static int do_md_run(mddev_t * mddev)
 
                /* 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 @@ static int do_md_run(mddev_t * mddev)
        }
 
        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 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open)
                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 @@ static int get_array_info(mddev_t * mddev, void __user * arg)
        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 @@ static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
 
        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 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
                )
                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 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
                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 @@ static void status_resync(struct seq_file *seq, mddev_t * mddev)
        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 @@ void md_do_sync(mddev_t *mddev)
                        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 &&

diff --git a/drivers/md/md.h b/drivers/md/md.h
index bede26c..9461212 100644 (file)
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -142,7 +142,8 @@ struct mddev_s
        char                            clevel[16];
        int                             raid_disks;
        int                             max_disks;
-       sector_t                        size; /* used size of component devices */
+       sector_t                        dev_sectors;    /* used size of
+                                                        * component devices */
        sector_t                        array_sectors; /* exported array size */
        __u64                           events;
 

diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index 0ed1005..87accf7 100644 (file)
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -502,7 +502,7 @@ static int multipath_run (mddev_t *mddev)
        /*
         * Ok, everything is just fine now
         */
-       mddev->array_sectors = mddev->size * 2;
+       mddev->array_sectors = mddev->dev_sectors;
 
        mddev->queue->unplug_fn = multipath_unplug;
        mddev->queue->backing_dev_info.congested_fn = multipath_congested;

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 051ecfa..7799587 100644 (file)
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1726,7 +1726,7 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
                        return 0;
        }
 
-       max_sector = mddev->size << 1;
+       max_sector = mddev->dev_sectors;
        if (sector_nr >= max_sector) {
                /* If we aborted, we need to abort the
                 * sync on the 'current' bitmap chunk (there will
@@ -2051,7 +2051,7 @@ static int run(mddev_t *mddev)
        /*
         * Ok, everything is just fine now
         */
-       mddev->array_sectors = mddev->size * 2;
+       mddev->array_sectors = mddev->dev_sectors;
 
        mddev->queue->unplug_fn = raid1_unplug;
        mddev->queue->backing_dev_info.congested_fn = raid1_congested;
@@ -2116,12 +2116,12 @@ static int raid1_resize(mddev_t *mddev, sector_t sectors)
        mddev->array_sectors = sectors;
        set_capacity(mddev->gendisk, mddev->array_sectors);
        mddev->changed = 1;
-       if (mddev->array_sectors / 2 > mddev->size &&
+       if (mddev->array_sectors > mddev->dev_sectors &&
            mddev->recovery_cp == MaxSector) {
-               mddev->recovery_cp = mddev->size << 1;
+               mddev->recovery_cp = mddev->dev_sectors;
                set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
        }
-       mddev->size = mddev->array_sectors / 2;
+       mddev->dev_sectors = mddev->array_sectors;
        mddev->resync_max_sectors = sectors;
        return 0;
 }

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index fea61e3..d56cb2a 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1698,7 +1698,7 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
                        return 0;
 
  skipped:
-       max_sector = mddev->size << 1;
+       max_sector = mddev->dev_sectors;
        if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
                max_sector = mddev->resync_max_sectors;
        if (sector_nr >= max_sector) {
@@ -2079,7 +2079,7 @@ static int run(mddev_t *mddev)
        conf->far_offset = fo;
        conf->chunk_mask = (sector_t)(mddev->chunk_size>>9)-1;
        conf->chunk_shift = ffz(~mddev->chunk_size) - 9;
-       size = mddev->size >> (conf->chunk_shift-1);
+       size = mddev->dev_sectors >> conf->chunk_shift;
        sector_div(size, fc);
        size = size * conf->raid_disks;
        sector_div(size, nc);
@@ -2092,7 +2092,7 @@ static int run(mddev_t *mddev)
         */
        stride += conf->raid_disks - 1;
        sector_div(stride, conf->raid_disks);
-       mddev->size = stride  << (conf->chunk_shift-1);
+       mddev->dev_sectors = stride << conf->chunk_shift;
 
        if (fo)
                stride = 1;

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 849478e..4d71423 100644 (file)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3629,8 +3629,8 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
                                     *(new_data_disks) -1,
                                     raid_disks, data_disks,
                                     &dd_idx, &pd_idx, conf);
-       if (last_sector >= (mddev->size<<1))
-               last_sector = (mddev->size<<1)-1;
+       if (last_sector >= mddev->dev_sectors)
+               last_sector = mddev->dev_sectors - 1;
        while (first_sector <= last_sector) {
                pd_idx = stripe_to_pdidx(first_sector, conf,
                                         conf->previous_raid_disks);
@@ -3670,7 +3670,7 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski
        struct stripe_head *sh;
        int pd_idx;
        int raid_disks = conf->raid_disks;
-       sector_t max_sector = mddev->size << 1;
+       sector_t max_sector = mddev->dev_sectors;
        int sync_blocks;
        int still_degraded = 0;
        int i;
@@ -3708,7 +3708,7 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski
         */
        if (mddev->degraded >= conf->max_degraded &&
            test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
-               sector_t rv = (mddev->size << 1) - sector_nr;
+               sector_t rv = mddev->dev_sectors - sector_nr;
                *skipped = 1;
                return rv;
        }
@@ -4146,8 +4146,8 @@ static int run(mddev_t *mddev)
        conf->expand_progress = mddev->reshape_position;
 
        /* device size must be a multiple of chunk size */
-       mddev->size &= ~(mddev->chunk_size/1024 -1);
-       mddev->resync_max_sectors = mddev->size << 1;
+       mddev->dev_sectors &= ~(mddev->chunk_size / 512 - 1);
+       mddev->resync_max_sectors = mddev->dev_sectors;
 
        if (conf->level == 6 && conf->raid_disks < 4) {
                printk(KERN_ERR "raid6: not enough configured devices for %s (%d, minimum 4)\n",
@@ -4254,8 +4254,8 @@ static int run(mddev_t *mddev)
        mddev->queue->backing_dev_info.congested_data = mddev;
        mddev->queue->backing_dev_info.congested_fn = raid5_congested;
 
-       mddev->array_sectors = 2 * mddev->size * (conf->previous_raid_disks -
-                                           conf->max_degraded);
+       mddev->array_sectors = mddev->dev_sectors *
+               (conf->previous_raid_disks - conf->max_degraded);
 
        blk_queue_merge_bvec(mddev->queue, raid5_mergeable_bvec);
 
@@ -4482,11 +4482,11 @@ static int raid5_resize(mddev_t *mddev, sector_t sectors)
                                          - conf->max_degraded);
        set_capacity(mddev->gendisk, mddev->array_sectors);
        mddev->changed = 1;
-       if (sectors/2  > mddev->size && mddev->recovery_cp == MaxSector) {
-               mddev->recovery_cp = mddev->size << 1;
+       if (sectors > mddev->dev_sectors && mddev->recovery_cp == MaxSector) {
+               mddev->recovery_cp = mddev->dev_sectors;
                set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
        }
-       mddev->size = sectors /2;
+       mddev->dev_sectors = sectors;
        mddev->resync_max_sectors = sectors;
        return 0;
 }
@@ -4615,7 +4615,7 @@ static void end_reshape(raid5_conf_t *conf)
        struct block_device *bdev;
 
        if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) {
-               conf->mddev->array_sectors = 2 * conf->mddev->size *
+               conf->mddev->array_sectors = conf->mddev->dev_sectors *
                        (conf->raid_disks - conf->max_degraded);
                set_capacity(conf->mddev->gendisk, conf->mddev->array_sectors);
                conf->mddev->changed = 1;