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UBI: Fastmap: Locking updates

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a) Rename ubi->fm_sem to ubi->fm_eba_sem as this semaphore
protects EBA changes.
b) Turn ubi->fm_mutex into a rw semaphore. It will still serialize
fastmap writes but also ensures that ubi_wl_put_peb() is not
interrupted by a fastmap write. We use a rw semaphore to allow
ubi_wl_put_peb() still to be executed in parallel if no fastmap
write is happening.

Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Richard Weinberger
2014-11-10 16:28:08 +01:00
parent 42dd3cdcd6
commit 111ab0b26f
5 changed files with 50 additions and 44 deletions
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9
drivers/mtd/ubi/ubi.h
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@@ -426,10 +426,11 @@ struct ubi_debug_info {
* @fm_pool: in-memory data structure of the fastmap pool
* @fm_wl_pool: in-memory data structure of the fastmap pool used by the WL
* sub-system
* @fm_mutex: serializes ubi_update_fastmap() and protects @fm_buf
* @fm_protect: serializes ubi_update_fastmap(), protects @fm_buf and makes sure
* that critical sections cannot be interrupted by ubi_update_fastmap()
* @fm_buf: vmalloc()'d buffer which holds the raw fastmap
* @fm_size: fastmap size in bytes
* @fm_sem: allows ubi_update_fastmap() to block EBA table changes
* @fm_eba_sem: allows ubi_update_fastmap() to block EBA table changes
* @fm_work: fastmap work queue
* @fm_work_scheduled: non-zero if fastmap work was scheduled
*
@@ -534,8 +535,8 @@ struct ubi_device {
struct ubi_fastmap_layout *fm;
struct ubi_fm_pool fm_pool;
struct ubi_fm_pool fm_wl_pool;
struct rw_semaphore fm_sem;
struct mutex fm_mutex;
struct rw_semaphore fm_eba_sem;
struct rw_semaphore fm_protect;
void *fm_buf;
size_t fm_size;
struct work_struct fm_work;