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| author | WeiXiong Liao <liaoweixiong@allwinnertech.com> | 2020-03-25 16:55:05 +0800 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2020-05-31 19:49:00 -0700 |
| commit | 7dcb7848ba110ff192efc917d1a6de66b4c9ca4f (patch) | |
| tree | 53e7bdd3c266bbadeb9b7091889a736f5c76897a /fs/pstore/zone.c | |
| parent | 1525fb3bb6d69028b3941d34363397c28345ffab (diff) | |
| download | linux-7dcb7848ba110ff192efc917d1a6de66b4c9ca4f.tar.gz linux-7dcb7848ba110ff192efc917d1a6de66b4c9ca4f.tar.bz2 linux-7dcb7848ba110ff192efc917d1a6de66b4c9ca4f.zip | |
pstore/blk: Support non-block storage devices
Add support for non-block devices (e.g. MTD). A non-block driver calls
pstore_blk_register_device() to register iself.
In addition, pstore/zone is updated to handle non-block devices,
where an erase must be done before a write. Without this, there is no
way to remove records stored to an MTD.
Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com>
Link: https://lore.kernel.org/lkml/20200511233229.27745-10-keescook@chromium.org/
Co-developed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'fs/pstore/zone.c')
| -rw-r--r-- | fs/pstore/zone.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/pstore/zone.c b/fs/pstore/zone.c index add26b125984..819428dfa32f 100644 --- a/fs/pstore/zone.c +++ b/fs/pstore/zone.c @@ -660,15 +660,21 @@ static inline int psz_kmsg_erase(struct psz_context *cxt, struct psz_buffer *buffer = zone->buffer; struct psz_kmsg_header *hdr = (struct psz_kmsg_header *)buffer->data; + size_t size; if (unlikely(!psz_ok(zone))) return 0; + /* this zone is already updated, no need to erase */ if (record->count != hdr->counter) return 0; + size = buffer_datalen(zone) + sizeof(*zone->buffer); atomic_set(&zone->buffer->datalen, 0); - return psz_zone_write(zone, FLUSH_META, NULL, 0, 0); + if (cxt->pstore_zone_info->erase) + return cxt->pstore_zone_info->erase(size, zone->off); + else + return psz_zone_write(zone, FLUSH_META, NULL, 0, 0); } static inline int psz_record_erase(struct psz_context *cxt, |