diff options
| author | Xiao Ni <xni@redhat.com> | 2020-06-30 15:55:36 +0800 |
|---|---|---|
| committer | Song Liu <songliubraving@fb.com> | 2020-08-02 23:03:51 -0700 |
| commit | d9c0fa509eafb31605bddda34e2e39f4354563b6 (patch) | |
| tree | f7cee21f2490bad7e8c1fe0c3a7cfab25daad174 /drivers/md | |
| parent | a9e8e18aaf914bf273ed63480c4c3d8dd626c95f (diff) | |
md: fix max sectors calculation for super 1.0
To grow size of super 1.0 raid array, it is necessary to check the device
max usable size.
Now it uses rdev->sectors for max usable size. If one disk is 500G and the
raid device only uses the 100GB of this disk. rdev->sectors can't tell the
real max usable size. The max usable size should be
dev_size-(superblock_size+bitmap_size+badblock_size).
Also, remove unnecessary sb_start update in super_1_rdev_size_change().
Signed-off-by: Xiao Ni <xni@redhat.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/md.c | 35 |
1 files changed, 31 insertions, 4 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index ea48bc25cce1..5e8f772ab117 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -2193,6 +2193,24 @@ retry: sb->sb_csum = calc_sb_1_csum(sb); } +static sector_t super_1_choose_bm_space(sector_t dev_size) +{ + sector_t bm_space; + + /* if the device is bigger than 8Gig, save 64k for bitmap + * usage, if bigger than 200Gig, save 128k + */ + if (dev_size < 64*2) + bm_space = 0; + else if (dev_size - 64*2 >= 200*1024*1024*2) + bm_space = 128*2; + else if (dev_size - 4*2 > 8*1024*1024*2) + bm_space = 64*2; + else + bm_space = 4*2; + return bm_space; +} + static unsigned long long super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) { @@ -2213,13 +2231,22 @@ super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) return 0; } else { /* minor version 0; superblock after data */ - sector_t sb_start; - sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; + sector_t sb_start, bm_space; + sector_t dev_size = i_size_read(rdev->bdev->bd_inode) >> 9; + + /* 8K is for superblock */ + sb_start = dev_size - 8*2; sb_start &= ~(sector_t)(4*2 - 1); - max_sectors = rdev->sectors + sb_start - rdev->sb_start; + + bm_space = super_1_choose_bm_space(dev_size); + + /* Space that can be used to store date needs to decrease + * superblock bitmap space and bad block space(4K) + */ + max_sectors = sb_start - bm_space - 4*2; + if (!num_sectors || num_sectors > max_sectors) num_sectors = max_sectors; - rdev->sb_start = sb_start; } sb = page_address(rdev->sb_page); sb->data_size = cpu_to_le64(num_sectors); |