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libnvdimm, btt: ensure that initializing metadata clears poison

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If we had badblocks/poison in the metadata area of a BTT, recreating the
BTT would not clear the poison in all cases, notably the flog area. This
is because rw_bytes will only clear errors if the request being sent
down is 512B aligned and sized.

Make sure that when writing the map and info blocks, the rw_bytes being
sent are of the correct size/alignment. For the flog, instead of doing
the smaller log_entry writes only, first do a 'wipe' of the entire area
by writing zeroes in large enough chunks so that errors get cleared.

Cc: Andy Rudoff <andy.rudoff@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Vishal Verma 2017-05-10 15:01:31 -06:00 committed by Dan Williams
parent 3ae3d67ba7
commit b177fe85dd
1 changed files with 47 additions and 7 deletions
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54
drivers/nvdimm/btt.c
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@ -57,6 +57,14 @@ static int btt_info_write(struct arena_info *arena, struct btt_sb *super)
{
int ret;
/*
* infooff and info2off should always be at least 512B aligned.
* We rely on that to make sure rw_bytes does error clearing
* correctly, so make sure that is the case.
*/
WARN_ON_ONCE(!IS_ALIGNED(arena->infooff, 512));
WARN_ON_ONCE(!IS_ALIGNED(arena->info2off, 512));
ret = arena_write_bytes(arena, arena->info2off, super,
sizeof(struct btt_sb), 0);
if (ret)
@ -394,9 +402,17 @@ static int btt_map_init(struct arena_info *arena)
if (!zerobuf)
return -ENOMEM;
/*
* mapoff should always be at least 512B aligned. We rely on that to
* make sure rw_bytes does error clearing correctly, so make sure that
* is the case.
*/
WARN_ON_ONCE(!IS_ALIGNED(arena->mapoff, 512));
while (mapsize) {
size_t size = min(mapsize, chunk_size);
WARN_ON_ONCE(size < 512);
ret = arena_write_bytes(arena, arena->mapoff + offset, zerobuf,
size, 0);
if (ret)
@ -418,11 +434,36 @@ static int btt_map_init(struct arena_info *arena)
*/
static int btt_log_init(struct arena_info *arena)
{
size_t logsize = arena->info2off - arena->logoff;
size_t chunk_size = SZ_4K, offset = 0;
struct log_entry log;
void *zerobuf;
int ret;
u32 i;
struct log_entry log, zerolog;
memset(&zerolog, 0, sizeof(zerolog));
zerobuf = kzalloc(chunk_size, GFP_KERNEL);
if (!zerobuf)
return -ENOMEM;
/*
* logoff should always be at least 512B aligned. We rely on that to
* make sure rw_bytes does error clearing correctly, so make sure that
* is the case.
*/
WARN_ON_ONCE(!IS_ALIGNED(arena->logoff, 512));
while (logsize) {
size_t size = min(logsize, chunk_size);
WARN_ON_ONCE(size < 512);
ret = arena_write_bytes(arena, arena->logoff + offset, zerobuf,
size, 0);
if (ret)
goto free;
offset += size;
logsize -= size;
cond_resched();
}
for (i = 0; i < arena->nfree; i++) {
log.lba = cpu_to_le32(i);
@ -431,13 +472,12 @@ static int btt_log_init(struct arena_info *arena)
log.seq = cpu_to_le32(LOG_SEQ_INIT);
ret = __btt_log_write(arena, i, 0, &log, 0);
if (ret)
return ret;
ret = __btt_log_write(arena, i, 1, &zerolog, 0);
if (ret)
return ret;
goto free;
}
return 0;
free:
kfree(zerobuf);
return ret;
}
static int btt_freelist_init(struct arena_info *arena)