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lib/ftl: non-volatile cache's header validation function

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Moved metadata header verification to a separate function, since the
metadata read callback got pretty large.

Change-Id: I0c8b2eb493631a6495ce2ef7d9586d2c7cb7772f
Signed-off-by: Konrad Sztyber <konrad.sztyber@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/460795
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
This commit is contained in:
Konrad Sztyber 2019-07-04 15:01:18 +02:00 committed by Ben Walker
parent 5c9a503990
commit 3e911e17c7
1 changed files with 55 additions and 51 deletions
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80
lib/ftl/ftl_restore.c
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@ -863,17 +863,52 @@ ftl_nv_cache_scan_block(struct ftl_nv_cache_block *block)
return 0;
}
static bool
ftl_nv_cache_header_valid(struct spdk_ftl_dev *dev, const struct ftl_nv_cache_header *hdr)
{
struct spdk_bdev *bdev = spdk_bdev_desc_get_bdev(dev->nv_cache.bdev_desc);
uint32_t checksum;
checksum = spdk_crc32c_update(hdr, offsetof(struct ftl_nv_cache_header, checksum), 0);
if (checksum != hdr->checksum) {
SPDK_ERRLOG("Invalid header checksum (found: %"PRIu32", expected: %"PRIu32")\n",
checksum, hdr->checksum);
return false;
}
if (hdr->version != FTL_NV_CACHE_HEADER_VERSION) {
SPDK_ERRLOG("Invalid header version (found: %"PRIu32", expected: %"PRIu32")\n",
hdr->version, FTL_NV_CACHE_HEADER_VERSION);
return false;
}
if (hdr->size != spdk_bdev_get_num_blocks(bdev)) {
SPDK_ERRLOG("Unexpected size of the non-volatile cache bdev (%"PRIu64", expected: %"
PRIu64")\n", hdr->size, spdk_bdev_get_num_blocks(bdev));
return false;
}
if (spdk_uuid_compare(&hdr->uuid, &dev->uuid)) {
SPDK_ERRLOG("Invalid device UUID\n");
return false;
}
if (!ftl_nv_cache_phase_is_valid(hdr->phase) && hdr->phase != 0) {
return false;
}
return true;
}
static void
ftl_nv_cache_read_header_cb(struct spdk_bdev_io *bdev_io, bool success, void *cb_arg)
{
struct ftl_restore *restore = cb_arg;
struct spdk_ftl_dev *dev = restore->dev;
struct spdk_bdev *bdev;
struct ftl_nv_cache *nv_cache = &dev->nv_cache;
struct ftl_nv_cache_header *hdr;
struct iovec *iov = NULL;
int iov_cnt = 0, i, rc;
uint32_t checksum;
if (!success) {
SPDK_ERRLOG("Unable to read non-volatile cache metadata header\n");
@ -881,50 +916,22 @@ ftl_nv_cache_read_header_cb(struct spdk_bdev_io *bdev_io, bool success, void *cb
goto out;
}
bdev = spdk_bdev_desc_get_bdev(nv_cache->bdev_desc);
spdk_bdev_io_get_iovec(bdev_io, &iov, &iov_cnt);
if (!iov) {
SPDK_ERRLOG("Unable to get the iov for non-volatile cache metadata header\n");
ftl_restore_complete(restore, -ENOTRECOVERABLE);
goto out;
}
assert(iov != NULL);
hdr = iov[0].iov_base;
checksum = spdk_crc32c_update(hdr, offsetof(struct ftl_nv_cache_header, checksum), 0);
if (checksum != hdr->checksum) {
SPDK_ERRLOG("Invalid header checksum (found: %"PRIu32", expected: %"PRIu32")\n",
checksum, hdr->checksum);
if (!ftl_nv_cache_header_valid(dev, hdr)) {
ftl_restore_complete(restore, -ENOTRECOVERABLE);
goto out;
}
if (hdr->version != FTL_NV_CACHE_HEADER_VERSION) {
SPDK_ERRLOG("Invalid header version (found: %"PRIu32", expected: %"PRIu32")\n",
hdr->version, FTL_NV_CACHE_HEADER_VERSION);
ftl_restore_complete(restore, -ENOTRECOVERABLE);
goto out;
}
/* Remember the latest phase */
nv_cache->phase = hdr->phase;
if (hdr->size != spdk_bdev_get_num_blocks(bdev)) {
SPDK_ERRLOG("Unexpected size of the non-volatile cache bdev (%"PRIu64", expected: %"
PRIu64")\n", hdr->size, spdk_bdev_get_num_blocks(bdev));
ftl_restore_complete(restore, -ENOTRECOVERABLE);
goto out;
}
if (spdk_uuid_compare(&hdr->uuid, &dev->uuid)) {
SPDK_ERRLOG("Invalid device UUID\n");
ftl_restore_complete(restore, -ENOTRECOVERABLE);
goto out;
}
if (!ftl_nv_cache_phase_is_valid(hdr->phase)) {
/* If the phase equals zero, we lost power during recovery. We need to finish it up
* by scrubbing the device once again.
*/
if (hdr->phase != 0) {
ftl_restore_complete(restore, -ENOTRECOVERABLE);
} else {
if (hdr->phase == 0) {
SPDK_DEBUGLOG(SPDK_LOG_FTL_INIT, "Detected phase 0, restarting scrub\n");
rc = ftl_nv_cache_scrub(nv_cache, ftl_nv_cache_scrub_cb, restore);
if (spdk_unlikely(rc != 0)) {
@ -932,13 +939,10 @@ ftl_nv_cache_read_header_cb(struct spdk_bdev_io *bdev_io, bool success, void *cb
spdk_strerror(-rc));
ftl_restore_complete(restore, -ENOTRECOVERABLE);
}
}
goto out;
}
/* Remember the latest phase */
nv_cache->phase = hdr->phase;
restore->nv_cache.current_addr = FTL_NV_CACHE_DATA_OFFSET;
for (i = 0; i < FTL_NV_CACHE_RESTORE_DEPTH; ++i) {