diff options
Diffstat (limited to 'drivers/mtd/ubi/ubi.h')
| -rw-r--r-- | drivers/mtd/ubi/ubi.h | 132 |
1 files changed, 102 insertions, 30 deletions
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h index b616a115c9d3..697dbcba7371 100644 --- a/drivers/mtd/ubi/ubi.h +++ b/drivers/mtd/ubi/ubi.h @@ -167,6 +167,17 @@ enum { }; /** + * struct ubi_vid_io_buf - VID buffer used to read/write VID info to/from the + * flash. + * @hdr: a pointer to the VID header stored in buffer + * @buffer: underlying buffer + */ +struct ubi_vid_io_buf { + struct ubi_vid_hdr *hdr; + void *buffer; +}; + +/** * struct ubi_wl_entry - wear-leveling entry. * @u.rb: link in the corresponding (free/used) RB-tree * @u.list: link in the protection queue @@ -267,6 +278,21 @@ struct ubi_fm_pool { }; /** + * struct ubi_eba_leb_desc - EBA logical eraseblock descriptor + * @lnum: the logical eraseblock number + * @pnum: the physical eraseblock where the LEB can be found + * + * This structure is here to hide EBA's internal from other part of the + * UBI implementation. + * + * One can query the position of a LEB by calling ubi_eba_get_ldesc(). + */ +struct ubi_eba_leb_desc { + int lnum; + int pnum; +}; + +/** * struct ubi_volume - UBI volume description data structure. * @dev: device object to make use of the the Linux device model * @cdev: character device object to create character device @@ -344,7 +370,7 @@ struct ubi_volume { long long upd_received; void *upd_buf; - int *eba_tbl; + struct ubi_eba_table *eba_tbl; unsigned int checked:1; unsigned int corrupted:1; unsigned int upd_marker:1; @@ -724,6 +750,8 @@ struct ubi_ainf_volume { * @ec_sum: a temporary variable used when calculating @mean_ec * @ec_count: a temporary variable used when calculating @mean_ec * @aeb_slab_cache: slab cache for &struct ubi_ainf_peb objects + * @ech: temporary EC header. Only available during scan + * @vidh: temporary VID buffer. Only available during scan * * This data structure contains the result of attaching an MTD device and may * be used by other UBI sub-systems to build final UBI data structures, further @@ -752,6 +780,8 @@ struct ubi_attach_info { uint64_t ec_sum; int ec_count; struct kmem_cache *aeb_slab_cache; + struct ubi_ec_hdr *ech; + struct ubi_vid_io_buf *vidb; }; /** @@ -792,8 +822,12 @@ extern struct mutex ubi_devices_mutex; extern struct blocking_notifier_head ubi_notifiers; /* attach.c */ +struct ubi_ainf_peb *ubi_alloc_aeb(struct ubi_attach_info *ai, int pnum, + int ec); +void ubi_free_aeb(struct ubi_attach_info *ai, struct ubi_ainf_peb *aeb); 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_add_av(struct ubi_attach_info *ai, int vol_id); struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai, int vol_id); void ubi_remove_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av); @@ -835,7 +869,21 @@ void ubi_update_reserved(struct ubi_device *ubi); void ubi_calculate_reserved(struct ubi_device *ubi); int ubi_check_pattern(const void *buf, uint8_t patt, int size); +static inline bool ubi_leb_valid(struct ubi_volume *vol, int lnum) +{ + return lnum >= 0 && lnum < vol->reserved_pebs; +} + /* eba.c */ +struct ubi_eba_table *ubi_eba_create_table(struct ubi_volume *vol, + int nentries); +void ubi_eba_destroy_table(struct ubi_eba_table *tbl); +void ubi_eba_copy_table(struct ubi_volume *vol, struct ubi_eba_table *dst, + int nentries); +void ubi_eba_replace_table(struct ubi_volume *vol, struct ubi_eba_table *tbl); +void ubi_eba_get_ldesc(struct ubi_volume *vol, int lnum, + struct ubi_eba_leb_desc *ldesc); +bool ubi_eba_is_mapped(struct ubi_volume *vol, int lnum); int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum); int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, @@ -850,7 +898,7 @@ int ubi_eba_write_leb_st(struct ubi_device *ubi, struct ubi_volume *vol, int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, const void *buf, int len); int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, - struct ubi_vid_hdr *vid_hdr); + struct ubi_vid_io_buf *vidb); 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, @@ -885,9 +933,9 @@ int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum, int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum, struct ubi_ec_hdr *ec_hdr); int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum, - struct ubi_vid_hdr *vid_hdr, int verbose); + struct ubi_vid_io_buf *vidb, int verbose); int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum, - struct ubi_vid_hdr *vid_hdr); + struct ubi_vid_io_buf *vidb); /* build.c */ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, @@ -1008,44 +1056,68 @@ static inline void ubi_move_aeb_to_list(struct ubi_ainf_volume *av, } /** - * ubi_zalloc_vid_hdr - allocate a volume identifier header object. - * @ubi: UBI device description object - * @gfp_flags: GFP flags to allocate with - * - * This function returns a pointer to the newly allocated and zero-filled - * volume identifier header object in case of success and %NULL in case of - * failure. + * ubi_init_vid_buf - Initialize a VID buffer + * @ubi: the UBI device + * @vidb: the VID buffer to initialize + * @buf: the underlying buffer */ -static inline struct ubi_vid_hdr * -ubi_zalloc_vid_hdr(const struct ubi_device *ubi, gfp_t gfp_flags) +static inline void ubi_init_vid_buf(const struct ubi_device *ubi, + struct ubi_vid_io_buf *vidb, + void *buf) { - void *vid_hdr; + if (buf) + memset(buf, 0, ubi->vid_hdr_alsize); - vid_hdr = kzalloc(ubi->vid_hdr_alsize, gfp_flags); - if (!vid_hdr) + vidb->buffer = buf; + vidb->hdr = buf + ubi->vid_hdr_shift; +} + +/** + * ubi_init_vid_buf - Allocate a VID buffer + * @ubi: the UBI device + * @gfp_flags: GFP flags to use for the allocation + */ +static inline struct ubi_vid_io_buf * +ubi_alloc_vid_buf(const struct ubi_device *ubi, gfp_t gfp_flags) +{ + struct ubi_vid_io_buf *vidb; + void *buf; + + vidb = kzalloc(sizeof(*vidb), gfp_flags); + if (!vidb) + return NULL; + + buf = kmalloc(ubi->vid_hdr_alsize, gfp_flags); + if (!buf) { + kfree(vidb); return NULL; + } - /* - * VID headers may be stored at un-aligned flash offsets, so we shift - * the pointer. - */ - return vid_hdr + ubi->vid_hdr_shift; + ubi_init_vid_buf(ubi, vidb, buf); + + return vidb; } /** - * ubi_free_vid_hdr - free a volume identifier header object. - * @ubi: UBI device description object - * @vid_hdr: the object to free + * ubi_free_vid_buf - Free a VID buffer + * @vidb: the VID buffer to free */ -static inline void ubi_free_vid_hdr(const struct ubi_device *ubi, - struct ubi_vid_hdr *vid_hdr) +static inline void ubi_free_vid_buf(struct ubi_vid_io_buf *vidb) { - void *p = vid_hdr; - - if (!p) + if (!vidb) return; - kfree(p - ubi->vid_hdr_shift); + kfree(vidb->buffer); + kfree(vidb); +} + +/** + * ubi_get_vid_hdr - Get the VID header attached to a VID buffer + * @vidb: VID buffer + */ +static inline struct ubi_vid_hdr *ubi_get_vid_hdr(struct ubi_vid_io_buf *vidb) +{ + return vidb->hdr; } /* |