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md: load/store badblock list from v1.x metadata 

Space must have been allocated when array was created.
A feature flag is set when the badblock list is non-empty, to
ensure old kernels don't load and trust the whole device.

We only update the on-disk badblocklist when it has changed.
If the badblocklist (or other metadata) is stored on a bad block, we
don't cope very well.

If metadata has no room for bad block, flag bad-blocks as disabled,
and do the same for 0.90 metadata.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2011-07-28 11:31:47 +10:00
parent 34b343cff4
commit 2699b67223
3 changed files with 116 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

108
drivers/md/md.c
View File

@ -757,6 +757,10 @@ static void free_disk_sb(mdk_rdev_t * rdev)
rdev->sb_start = 0;
rdev->sectors = 0;
}
if (rdev->bb_page) {
put_page(rdev->bb_page);
rdev->bb_page = NULL;
}
}
@ -1395,6 +1399,8 @@ static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
return cpu_to_le32(csum);
}
static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors,
int acknowledged);
static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
{
struct mdp_superblock_1 *sb;
@ -1473,6 +1479,47 @@ static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
else
rdev->desc_nr = le32_to_cpu(sb->dev_number);
if (!rdev->bb_page) {
rdev->bb_page = alloc_page(GFP_KERNEL);
if (!rdev->bb_page)
return -ENOMEM;
}
if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
rdev->badblocks.count == 0) {
/* need to load the bad block list.
* Currently we limit it to one page.
*/
s32 offset;
sector_t bb_sector;
u64 *bbp;
int i;
int sectors = le16_to_cpu(sb->bblog_size);
if (sectors > (PAGE_SIZE / 512))
return -EINVAL;
offset = le32_to_cpu(sb->bblog_offset);
if (offset == 0)
return -EINVAL;
bb_sector = (long long)offset;
if (!sync_page_io(rdev, bb_sector, sectors << 9,
rdev->bb_page, READ, true))
return -EIO;
bbp = (u64 *)page_address(rdev->bb_page);
rdev->badblocks.shift = sb->bblog_shift;
for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
u64 bb = le64_to_cpu(*bbp);
int count = bb & (0x3ff);
u64 sector = bb >> 10;
sector <<= sb->bblog_shift;
count <<= sb->bblog_shift;
if (bb + 1 == 0)
break;
if (md_set_badblocks(&rdev->badblocks,
sector, count, 1) == 0)
return -EINVAL;
}
} else if (sb->bblog_offset == 0)
rdev->badblocks.shift = -1;
if (!refdev) {
ret = 1;
} else {
@ -1624,7 +1671,6 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
sb->pad0 = 0;
sb->recovery_offset = cpu_to_le64(0);
memset(sb->pad1, 0, sizeof(sb->pad1));
memset(sb->pad2, 0, sizeof(sb->pad2));
memset(sb->pad3, 0, sizeof(sb->pad3));
sb->utime = cpu_to_le64((__u64)mddev->utime);
@ -1664,6 +1710,40 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors);
}
if (rdev->badblocks.count == 0)
/* Nothing to do for bad blocks*/ ;
else if (sb->bblog_offset == 0)
/* Cannot record bad blocks on this device */
md_error(mddev, rdev);
else {
struct badblocks *bb = &rdev->badblocks;
u64 *bbp = (u64 *)page_address(rdev->bb_page);
u64 *p = bb->page;
sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
if (bb->changed) {
unsigned seq;
retry:
seq = read_seqbegin(&bb->lock);
memset(bbp, 0xff, PAGE_SIZE);
for (i = 0 ; i < bb->count ; i++) {
u64 internal_bb = *p++;
u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
| BB_LEN(internal_bb));
*bbp++ = cpu_to_le64(store_bb);
}
if (read_seqretry(&bb->lock, seq))
goto retry;
bb->sector = (rdev->sb_start +
(int)le32_to_cpu(sb->bblog_offset));
bb->size = le16_to_cpu(sb->bblog_size);
bb->changed = 0;
}
}
max_dev = 0;
list_for_each_entry(rdev2, &mddev->disks, same_set)
if (rdev2->desc_nr+1 > max_dev)
@ -2196,6 +2276,7 @@ static void md_update_sb(mddev_t * mddev, int force_change)
mdk_rdev_t *rdev;
int sync_req;
int nospares = 0;
int any_badblocks_changed = 0;
repeat:
/* First make sure individual recovery_offsets are correct */
@ -2267,6 +2348,11 @@ static void md_update_sb(mddev_t * mddev, int force_change)
MD_BUG();
mddev->events --;
}
list_for_each_entry(rdev, &mddev->disks, same_set)
if (rdev->badblocks.changed)
any_badblocks_changed++;
sync_sbs(mddev, nospares);
spin_unlock_irq(&mddev->write_lock);
@ -2292,6 +2378,13 @@ static void md_update_sb(mddev_t * mddev, int force_change)
bdevname(rdev->bdev,b),
(unsigned long long)rdev->sb_start);
rdev->sb_events = mddev->events;
if (rdev->badblocks.size) {
md_super_write(mddev, rdev,
rdev->badblocks.sector,
rdev->badblocks.size << 9,
rdev->bb_page);
rdev->badblocks.size = 0;
}
} else
dprintk(")\n");
@ -2315,6 +2408,9 @@ static void md_update_sb(mddev_t * mddev, int force_change)
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
sysfs_notify(&mddev->kobj, NULL, "sync_completed");
if (any_badblocks_changed)
list_for_each_entry(rdev, &mddev->disks, same_set)
md_ack_all_badblocks(&rdev->badblocks);
}
/* words written to sysfs files may, or may not, be \n terminated.
@ -2822,6 +2918,8 @@ int md_rdev_init(mdk_rdev_t *rdev)
rdev->sb_events = 0;
rdev->last_read_error.tv_sec = 0;
rdev->last_read_error.tv_nsec = 0;
rdev->sb_loaded = 0;
rdev->bb_page = NULL;
atomic_set(&rdev->nr_pending, 0);
atomic_set(&rdev->read_errors, 0);
atomic_set(&rdev->corrected_errors, 0);
@ -2910,11 +3008,9 @@ static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_mi
return rdev;
abort_free:
if (rdev->sb_page) {
if (rdev->bdev)
unlock_rdev(rdev);
free_disk_sb(rdev);
}
if (rdev->bdev)
unlock_rdev(rdev);
free_disk_sb(rdev);
kfree(rdev->badblocks.page);
kfree(rdev);
return ERR_PTR(err);

5
drivers/md/md.h
View File

@ -55,7 +55,7 @@ struct mdk_rdev_s
struct block_device *meta_bdev;
struct block_device *bdev; /* block device handle */
struct page *sb_page;
struct page *sb_page, *bb_page;
int sb_loaded;
__u64 sb_events;
sector_t data_offset; /* start of data in array */
@ -127,6 +127,9 @@ struct mdk_rdev_s
u64 *page; /* badblock list */
int changed;
seqlock_t lock;
sector_t sector;
sector_t size; /* in sectors */
} badblocks;
};

14
include/linux/raid/md_p.h
View File

@ -245,10 +245,16 @@ struct mdp_superblock_1 {
__u8 device_uuid[16]; /* user-space setable, ignored by kernel */
__u8 devflags; /* per-device flags. Only one defined...*/
#define WriteMostly1 1 /* mask for writemostly flag in above */
__u8 pad2[64-57]; /* set to 0 when writing */
/* Bad block log. If there are any bad blocks the feature flag is set.
* If offset and size are non-zero, that space is reserved and available
*/
__u8 bblog_shift; /* shift from sectors to block size */
__le16 bblog_size; /* number of sectors reserved for list */
__le32 bblog_offset; /* sector offset from superblock to bblog,
* signed - not unsigned */
/* array state information - 64 bytes */
__le64 utime; /* 40 bits second, 24 btes microseconds */
__le64 utime; /* 40 bits second, 24 bits microseconds */
__le64 events; /* incremented when superblock updated */
__le64 resync_offset; /* data before this offset (from data_offset) known to be in sync */
__le32 sb_csum; /* checksum up to devs[max_dev] */
@ -270,8 +276,8 @@ struct mdp_superblock_1 {
* must be honoured
*/
#define MD_FEATURE_RESHAPE_ACTIVE 4
#define MD_FEATURE_BAD_BLOCKS 8 /* badblock list is not empty */
#define MD_FEATURE_ALL (1|2|4)
#define MD_FEATURE_ALL (1|2|4|8)
#endif