UBI: Add fastmap stuff to ubi.h

This patch adds fastmap specific data structures to ubi.h.
It moves also struct ubi_work to ubi.h as it is now needed
for more than one c file.

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 383ee43d2425841932f5676ea833275091f41577..b0d3ba2a3dea1e6a473c5566e0007a2ce31b9f44 100644 (file)
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -133,6 +133,17 @@ enum {
        MOVE_RETRY,
 };
 
+/*
+ * Return codes of the fastmap sub-system
+ *
+ * UBI_NO_FASTMAP: No fastmap super block was found
+ * UBI_BAD_FASTMAP: A fastmap was found but it's unusable
+ */
+enum {
+       UBI_NO_FASTMAP = 1,
+       UBI_BAD_FASTMAP,
+};
+
 /**
  * struct ubi_wl_entry - wear-leveling entry.
  * @u.rb: link in the corresponding (free/used) RB-tree
@@ -198,6 +209,41 @@ struct ubi_rename_entry {
 
 struct ubi_volume_desc;
 
+/**
+ * struct ubi_fastmap_layout - in-memory fastmap data structure.
+ * @e: PEBs used by the current fastmap
+ * @to_be_tortured: if non-zero tortured this PEB
+ * @used_blocks: number of used PEBs
+ * @max_pool_size: maximal size of the user pool
+ * @max_wl_pool_size: maximal size of the pool used by the WL sub-system
+ */
+struct ubi_fastmap_layout {
+       struct ubi_wl_entry *e[UBI_FM_MAX_BLOCKS];
+       int to_be_tortured[UBI_FM_MAX_BLOCKS];
+       int used_blocks;
+       int max_pool_size;
+       int max_wl_pool_size;
+};
+
+/**
+ * struct ubi_fm_pool - in-memory fastmap pool
+ * @pebs: PEBs in this pool
+ * @used: number of used PEBs
+ * @size: total number of PEBs in this pool
+ * @max_size: maximal size of the pool
+ *
+ * A pool gets filled with up to max_size.
+ * If all PEBs within the pool are used a new fastmap will be written
+ * to the flash and the pool gets refilled with empty PEBs.
+ *
+ */
+struct ubi_fm_pool {
+       int pebs[UBI_FM_MAX_POOL_SIZE];
+       int used;
+       int size;
+       int max_size;
+};
+
 /**
  * struct ubi_volume - UBI volume description data structure.
  * @dev: device object to make use of the the Linux device model
@@ -333,9 +379,21 @@ struct ubi_wl_entry;
  * @ltree: the lock tree
  * @alc_mutex: serializes "atomic LEB change" operations
  *
+ * @fm_disabled: non-zero if fastmap is disabled (default)
+ * @fm: in-memory data structure of the currently used fastmap
+ * @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_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_work: fastmap work queue
+ *
  * @used: RB-tree of used physical eraseblocks
  * @erroneous: RB-tree of erroneous used physical eraseblocks
  * @free: RB-tree of free physical eraseblocks
+ * @free_count: Contains the number of elements in @free
  * @scrub: RB-tree of physical eraseblocks which need scrubbing
  * @pq: protection queue (contain physical eraseblocks which are temporarily
  *      protected from the wear-leveling worker)
@@ -426,10 +484,22 @@ struct ubi_device {
        struct rb_root ltree;
        struct mutex alc_mutex;
 
+       /* Fastmap stuff */
+       int fm_disabled;
+       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;
+       void *fm_buf;
+       size_t fm_size;
+       struct work_struct fm_work;
+
        /* Wear-leveling sub-system's stuff */
        struct rb_root used;
        struct rb_root erroneous;
        struct rb_root free;
+       int free_count;
        struct rb_root scrub;
        struct list_head pq[UBI_PROT_QUEUE_LEN];
        int pq_head;
@@ -596,6 +666,32 @@ struct ubi_attach_info {
        struct kmem_cache *aeb_slab_cache;
 };
 
+/**
+ * struct ubi_work - UBI work description data structure.
+ * @list: a link in the list of pending works
+ * @func: worker function
+ * @e: physical eraseblock to erase
+ * @vol_id: the volume ID on which this erasure is being performed
+ * @lnum: the logical eraseblock number
+ * @torture: if the physical eraseblock has to be tortured
+ * @anchor: produce a anchor PEB to by used by fastmap
+ *
+ * The @func pointer points to the worker function. If the @cancel argument is
+ * not zero, the worker has to free the resources and exit immediately. The
+ * worker has to return zero in case of success and a negative error code in
+ * case of failure.
+ */
+struct ubi_work {
+       struct list_head list;
+       int (*func)(struct ubi_device *ubi, struct ubi_work *wrk, int cancel);
+       /* The below fields are only relevant to erasure works */
+       struct ubi_wl_entry *e;
+       int vol_id;
+       int lnum;
+       int torture;
+       int anchor;
+};
+
 #include "debug.h"
 
 extern struct kmem_cache *ubi_wl_entry_slab;
@@ -606,7 +702,7 @@ extern struct class *ubi_class;
 extern struct mutex ubi_devices_mutex;
 extern struct blocking_notifier_head ubi_notifiers;
 
-/* scan.c */
+/* attach.c */
 int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum,
                  int ec, const struct ubi_vid_hdr *vid_hdr, int bitflips);
 struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai,
@@ -664,6 +760,9 @@ int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
 int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
                     struct ubi_vid_hdr *vid_hdr);
 int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai);
+unsigned long long ubi_next_sqnum(struct ubi_device *ubi);
+int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,
+                  struct ubi_attach_info *ai_scan);
 
 /* wl.c */
 int ubi_wl_get_peb(struct ubi_device *ubi);
@@ -674,6 +773,12 @@ int ubi_wl_scrub_peb(struct ubi_device *ubi, int pnum);
 int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai);
 void ubi_wl_close(struct ubi_device *ubi);
 int ubi_thread(void *u);
+struct ubi_wl_entry *ubi_wl_get_fm_peb(struct ubi_device *ubi, int anchor);
+int ubi_wl_put_fm_peb(struct ubi_device *ubi, struct ubi_wl_entry *used_e,
+                     int lnum, int torture);
+int ubi_is_erase_work(struct ubi_work *wrk);
+void ubi_refill_pools(struct ubi_device *ubi);
+int ubi_ensure_anchor_pebs(struct ubi_device *ubi);
 
 /* io.c */
 int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset,
@@ -711,6 +816,15 @@ void ubi_free_internal_volumes(struct ubi_device *ubi);
 void ubi_do_get_device_info(struct ubi_device *ubi, struct ubi_device_info *di);
 void ubi_do_get_volume_info(struct ubi_device *ubi, struct ubi_volume *vol,
                            struct ubi_volume_info *vi);
+/* scan.c */
+int ubi_compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb,
+                     int pnum, const struct ubi_vid_hdr *vid_hdr);
+
+/* fastmap.c */
+size_t ubi_calc_fm_size(struct ubi_device *ubi);
+int ubi_update_fastmap(struct ubi_device *ubi);
+int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
+                    int fm_anchor);
 
 /*
  * ubi_rb_for_each_entry - walk an RB-tree.

diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index 032fc57f109004e7e6d462cbd36c2971a281cf45..f4d06dbdb2a9820b5c2350d2a4cbae415a1f3b18 100644 (file)
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -135,30 +135,6 @@
  */
 #define WL_MAX_FAILURES 32
 
-/**
- * struct ubi_work - UBI work description data structure.
- * @list: a link in the list of pending works
- * @func: worker function
- * @e: physical eraseblock to erase
- * @vol_id: the volume ID on which this erasure is being performed
- * @lnum: the logical eraseblock number
- * @torture: if the physical eraseblock has to be tortured
- *
- * The @func pointer points to the worker function. If the @cancel argument is
- * not zero, the worker has to free the resources and exit immediately. The
- * worker has to return zero in case of success and a negative error code in
- * case of failure.
- */
-struct ubi_work {
-       struct list_head list;
-       int (*func)(struct ubi_device *ubi, struct ubi_work *wrk, int cancel);
-       /* The below fields are only relevant to erasure works */
-       struct ubi_wl_entry *e;
-       int vol_id;
-       int lnum;
-       int torture;
-};
-
 static int self_check_ec(struct ubi_device *ubi, int pnum, int ec);
 static int self_check_in_wl_tree(const struct ubi_device *ubi,
                                 struct ubi_wl_entry *e, struct rb_root *root);