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authorVishal Verma <vishal.l.verma@intel.com>2017-05-10 15:01:31 -0600
committerDan Williams <dan.j.williams@intel.com>2017-05-10 21:46:22 -0700
commitb177fe85dd27de1ee4c29f59c4e82b3ea3b78784 (patch)
treefe0b38a554197181de1f019a14893c83201d7bb1 /drivers/nvdimm/btt.c
parent3ae3d67ba705c754a3c91ac009f9ce73a0e7286a (diff)
libnvdimm, btt: ensure that initializing metadata clears poison
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>
Diffstat (limited to 'drivers/nvdimm/btt.c')
-rw-r--r--drivers/nvdimm/btt.c54
1 files changed, 47 insertions, 7 deletions
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index aa977cd4869d..983718b8fd9b 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -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)

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