#define UBI_IO_RETRIES 3
/*
+ * Length of the protection queue. The length is effectively equivalent to the
+ * number of (global) erase cycles PEBs are protected from the wear-leveling
+ * worker.
+ */
+#define UBI_PROT_QUEUE_LEN 10
+
+/*
* Error codes returned by the I/O sub-system.
*
* UBI_IO_PEB_EMPTY: the physical eraseblock is empty, i.e. it contains only
UBI_IO_BITFLIPS
};
+/*
+ * Return codes of the 'ubi_eba_copy_leb()' function.
+ *
+ * MOVE_CANCEL_RACE: canceled because the volume is being deleted, the source
+ * PEB was put meanwhile, or there is I/O on the source PEB
+ * MOVE_SOURCE_RD_ERR: canceled because there was a read error from the source
+ * PEB
+ * MOVE_TARGET_RD_ERR: canceled because there was a read error from the target
+ * PEB
+ * MOVE_TARGET_WR_ERR: canceled because there was a write error to the target
+ * PEB
+ * MOVE_CANCEL_BITFLIPS: canceled because a bit-flip was detected in the
+ * target PEB
+ */
+enum {
+ MOVE_CANCEL_RACE = 1,
+ MOVE_SOURCE_RD_ERR,
+ MOVE_TARGET_RD_ERR,
+ MOVE_TARGET_WR_ERR,
+ MOVE_CANCEL_BITFLIPS,
+};
+
/**
* struct ubi_wl_entry - wear-leveling entry.
- * @rb: link in the corresponding RB-tree
+ * @u.rb: link in the corresponding (free/used) RB-tree
+ * @u.list: link in the protection queue
* @ec: erase counter
* @pnum: physical eraseblock number
*
* RB-trees. See WL sub-system for details.
*/
struct ubi_wl_entry {
- struct rb_node rb;
+ union {
+ struct rb_node rb;
+ struct list_head list;
+ } u;
int ec;
int pnum;
};
* @vol->readers, @vol->writers, @vol->exclusive,
* @vol->ref_count, @vol->mapping and @vol->eba_tbl.
* @ref_count: count of references on the UBI device
+ * @image_seq: image sequence number recorded on EC headers
+ * @image_seq_set: indicates @image_seq is known
*
* @rsvd_pebs: count of reserved physical eraseblocks
* @avail_pebs: count of available physical eraseblocks
* @beb_rsvd_level: normal level of PEBs reserved for bad PEB handling
*
* @autoresize_vol_id: ID of the volume which has to be auto-resized at the end
- * of UBI ititializetion
+ * of UBI initialization
* @vtbl_slots: how many slots are available in the volume table
* @vtbl_size: size of the volume table in bytes
* @vtbl: in-RAM volume table copy
* @alc_mutex: serializes "atomic LEB change" operations
*
* @used: RB-tree of used physical eraseblocks
+ * @erroneous: RB-tree of erroneous used physical eraseblocks
* @free: RB-tree of free physical eraseblocks
* @scrub: RB-tree of physical eraseblocks which need scrubbing
- * @prot: protection trees
- * @prot.pnum: protection tree indexed by physical eraseblock numbers
- * @prot.aec: protection tree indexed by absolute erase counter value
- * @wl_lock: protects the @used, @free, @prot, @lookuptbl, @abs_ec, @move_from,
- * @move_to, @move_to_put @erase_pending, @wl_scheduled, and @works
- * fields
+ * @pq: protection queue (contain physical eraseblocks which are temporarily
+ * protected from the wear-leveling worker)
+ * @pq_head: protection queue head
+ * @wl_lock: protects the @used, @free, @pq, @pq_head, @lookuptbl, @move_from,
+ * @move_to, @move_to_put @erase_pending, @wl_scheduled, @works,
+ * @erroneous, and @erroneous_peb_count fields
* @move_mutex: serializes eraseblock moves
- * @work_sem: sycnhronizes the WL worker with use tasks
+ * @work_sem: synchronizes the WL worker with use tasks
* @wl_scheduled: non-zero if the wear-leveling was scheduled
* @lookuptbl: a table to quickly find a &struct ubi_wl_entry object for any
* physical eraseblock
- * @abs_ec: absolute erase counter
* @move_from: physical eraseblock from where the data is being moved
* @move_to: physical eraseblock where the data is being moved to
* @move_to_put: if the "to" PEB was put
* @peb_size: physical eraseblock size
* @bad_peb_count: count of bad physical eraseblocks
* @good_peb_count: count of good physical eraseblocks
+ * @erroneous_peb_count: count of erroneous physical eraseblocks in @erroneous
+ * @max_erroneous: maximum allowed amount of erroneous physical eraseblocks
* @min_io_size: minimal input/output unit size of the underlying MTD device
* @hdrs_min_io_size: minimal I/O unit size used for VID and EC headers
* @ro_mode: if the UBI device is in read-only mode
*
* @peb_buf1: a buffer of PEB size used for different purposes
* @peb_buf2: another buffer of PEB size used for different purposes
- * @buf_mutex: proptects @peb_buf1 and @peb_buf2
+ * @buf_mutex: protects @peb_buf1 and @peb_buf2
* @ckvol_mutex: serializes static volume checking when opening
- * @mult_mutex: serializes operations on multiple volumes, like re-nameing
+ * @mult_mutex: serializes operations on multiple volumes, like re-naming
* @dbg_peb_buf: buffer of PEB size used for debugging
- * @dbg_buf_mutex: proptects @dbg_peb_buf
+ * @dbg_buf_mutex: protects @dbg_peb_buf
*/
struct ubi_device {
struct cdev cdev;
struct ubi_volume *volumes[UBI_MAX_VOLUMES+UBI_INT_VOL_COUNT];
spinlock_t volumes_lock;
int ref_count;
+ int image_seq;
+ int image_seq_set;
int rsvd_pebs;
int avail_pebs;
/* Wear-leveling sub-system's stuff */
struct rb_root used;
+ struct rb_root erroneous;
struct rb_root free;
struct rb_root scrub;
- struct {
- struct rb_root pnum;
- struct rb_root aec;
- } prot;
+ struct list_head pq[UBI_PROT_QUEUE_LEN];
+ int pq_head;
spinlock_t wl_lock;
struct mutex move_mutex;
struct rw_semaphore work_sem;
int wl_scheduled;
struct ubi_wl_entry **lookuptbl;
- unsigned long long abs_ec;
struct ubi_wl_entry *move_from;
struct ubi_wl_entry *move_to;
int move_to_put;
int peb_size;
int bad_peb_count;
int good_peb_count;
+ int erroneous_peb_count;
+ int max_erroneous;
int min_io_size;
int hdrs_min_io_size;
int ro_mode;
projects / h-e-n / blobdiff