diff options
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/md.c | 100 |
1 files changed, 87 insertions, 13 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index dc99d95a1b6..df1230af02c 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -658,11 +658,14 @@ static unsigned int calc_sb_csum(mdp_super_t * sb) */ struct super_type { - char *name; - struct module *owner; - int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version); - int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); - void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); + char *name; + struct module *owner; + int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, + int minor_version); + int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); + void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); + unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, + unsigned long long size); }; /* @@ -1004,6 +1007,27 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) } /* + * rdev_size_change for 0.90.0 + */ +static unsigned long long +super_90_rdev_size_change(mdk_rdev_t *rdev, unsigned long long size) +{ + if (size && size < rdev->mddev->size) + return 0; /* component must fit device */ + size *= 2; /* convert to sectors */ + if (rdev->mddev->bitmap_offset) + return 0; /* can't move bitmap */ + rdev->sb_offset = calc_dev_sboffset(rdev->bdev); + if (!size || size > rdev->sb_offset*2) + size = rdev->sb_offset*2; + md_super_write(rdev->mddev, rdev, rdev->sb_offset << 1, rdev->sb_size, + rdev->sb_page); + md_super_wait(rdev->mddev); + return size/2; /* kB for sysfs */ +} + + +/* * version 1 superblock */ @@ -1328,21 +1352,59 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) sb->sb_csum = calc_sb_1_csum(sb); } +static unsigned long long +super_1_rdev_size_change(mdk_rdev_t *rdev, unsigned long long size) +{ + struct mdp_superblock_1 *sb; + unsigned long long max_size; + if (size && size < rdev->mddev->size) + return 0; /* component must fit device */ + size *= 2; /* convert to sectors */ + if (rdev->sb_offset < rdev->data_offset/2) { + /* minor versions 1 and 2; superblock before data */ + max_size = (rdev->bdev->bd_inode->i_size >> 9); + max_size -= rdev->data_offset; + if (!size || size > max_size) + size = max_size; + } else if (rdev->mddev->bitmap_offset) { + /* minor version 0 with bitmap we can't move */ + return 0; + } else { + /* minor version 0; superblock after data */ + sector_t sb_offset; + sb_offset = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; + sb_offset &= ~(sector_t)(4*2 - 1); + max_size = rdev->size*2 + sb_offset - rdev->sb_offset*2; + if (!size || size > max_size) + size = max_size; + rdev->sb_offset = sb_offset/2; + } + sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); + sb->data_size = cpu_to_le64(size); + sb->super_offset = rdev->sb_offset*2; + sb->sb_csum = calc_sb_1_csum(sb); + md_super_write(rdev->mddev, rdev, rdev->sb_offset << 1, rdev->sb_size, + rdev->sb_page); + md_super_wait(rdev->mddev); + return size/2; /* kB for sysfs */ +} static struct super_type super_types[] = { [0] = { .name = "0.90.0", .owner = THIS_MODULE, - .load_super = super_90_load, - .validate_super = super_90_validate, - .sync_super = super_90_sync, + .load_super = super_90_load, + .validate_super = super_90_validate, + .sync_super = super_90_sync, + .rdev_size_change = super_90_rdev_size_change, }, [1] = { .name = "md-1", .owner = THIS_MODULE, - .load_super = super_1_load, - .validate_super = super_1_validate, - .sync_super = super_1_sync, + .load_super = super_1_load, + .validate_super = super_1_validate, + .sync_super = super_1_sync, + .rdev_size_change = super_1_rdev_size_change, }, }; @@ -2060,8 +2122,20 @@ rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) if (e==buf || (*e && *e != '\n')) return -EINVAL; - if (my_mddev->pers && rdev->raid_disk >= 0) - return -EBUSY; + if (my_mddev->pers && rdev->raid_disk >= 0) { + if (rdev->mddev->persistent) { + size = super_types[rdev->mddev->major_version]. + rdev_size_change(rdev, size); + if (!size) + return -EBUSY; + } else if (!size) { + size = (rdev->bdev->bd_inode->i_size >> 10); + size -= rdev->data_offset/2; + } + if (size < rdev->mddev->size) + return -EINVAL; /* component must fit device */ + } + rdev->size = size; if (size > oldsize && rdev->mddev->external) { /* need to check that all other rdevs with the same ->bdev |