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UBI: Fastmap: Introduce may_reserve_for_fm()

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...and kill another #ifdef.

Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Richard Weinberger 2014-10-29 10:31:41 +01:00
parent acfda79f88
commit 2f84c2469e
3 changed files with 28 additions and 6 deletions
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19
drivers/mtd/ubi/fastmap-wl.c
View File

@ -359,3 +359,22 @@ static void ubi_fastmap_close(struct ubi_device *ubi)
}
kfree(ubi->fm);
}
/**
* may_reserve_for_fm - tests whether a PEB shall be reserved for fastmap.
* See find_mean_wl_entry()
*
* @ubi: UBI device description object
* @e: physical eraseblock to return
* @root: RB tree to test against.
*/
static struct ubi_wl_entry *may_reserve_for_fm(struct ubi_device *ubi,
struct ubi_wl_entry *e,
struct rb_root *root) {
if (e && !ubi->fm_disabled && !ubi->fm &&
e->pnum < UBI_FM_MAX_START)
e = rb_entry(rb_next(root->rb_node),
struct ubi_wl_entry, u.rb);
return e;
}

7
drivers/mtd/ubi/wl.c
View File

@ -361,15 +361,10 @@ static struct ubi_wl_entry *find_mean_wl_entry(struct ubi_device *ubi,
if (last->ec - first->ec < WL_FREE_MAX_DIFF) {
e = rb_entry(root->rb_node, struct ubi_wl_entry, u.rb);
#ifdef CONFIG_MTD_UBI_FASTMAP
/* If no fastmap has been written and this WL entry can be used
* as anchor PEB, hold it back and return the second best
* WL entry such that fastmap can use the anchor PEB later. */
if (e && !ubi->fm_disabled && !ubi->fm &&
e->pnum < UBI_FM_MAX_START)
e = rb_entry(rb_next(root->rb_node),
struct ubi_wl_entry, u.rb);
#endif
e = may_reserve_for_fm(ubi, e, root);
} else
e = find_wl_entry(ubi, root, WL_FREE_MAX_DIFF/2);

8
drivers/mtd/ubi/wl.h
View File

@ -13,6 +13,9 @@ static inline void ubi_fastmap_init(struct ubi_device *ubi, int *count)
*count += (ubi->fm_size / ubi->leb_size) * 2;
INIT_WORK(&ubi->fm_work, update_fastmap_work_fn);
}
static struct ubi_wl_entry *may_reserve_for_fm(struct ubi_device *ubi,
struct ubi_wl_entry *e,
struct rb_root *root);
#else /* !CONFIG_MTD_UBI_FASTMAP */
static struct ubi_wl_entry *get_peb_for_wl(struct ubi_device *ubi);
static inline int is_fm_block(struct ubi_device *ubi, int pnum)
@ -21,5 +24,10 @@ static inline int is_fm_block(struct ubi_device *ubi, int pnum)
}
static inline void ubi_fastmap_close(struct ubi_device *ubi) { }
static inline void ubi_fastmap_init(struct ubi_device *ubi, int *count) { }
static struct ubi_wl_entry *may_reserve_for_fm(struct ubi_device *ubi,
struct ubi_wl_entry *e,
struct rb_root *root) {
return e;
}
#endif /* CONFIG_MTD_UBI_FASTMAP */
#endif /* UBI_WL_H */