UBI: introduce volume refcounting
Add ref_count field to UBI volumes and remove weired "vol->removed"
field. This way things are better understandable and we do not have
to do whold show_attr operation under spinlock.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 69cbee3..f782d5a 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -140,10 +140,10 @@
* @cdev: character device object to create character device
* @ubi: reference to the UBI device description object
* @vol_id: volume ID
+ * @ref_count: volume reference count
* @readers: number of users holding this volume in read-only mode
* @writers: number of users holding this volume in read-write mode
* @exclusive: whether somebody holds this volume in exclusive mode
- * @removed: if the volume was removed
* @checked: if this static volume was checked
*
* @reserved_pebs: how many physical eraseblocks are reserved for this volume
@@ -156,7 +156,7 @@
* @corrupted: non-zero if the volume is corrupted (static volumes only)
* @alignment: volume alignment
* @data_pad: how many bytes are not used at the end of physical eraseblocks to
- * satisfy the requested alignment
+ * satisfy the requested alignment
* @name_len: volume name length
* @name: volume name
*
@@ -185,10 +185,10 @@
struct cdev cdev;
struct ubi_device *ubi;
int vol_id;
+ int ref_count;
int readers;
int writers;
int exclusive;
- int removed;
int checked;
int reserved_pebs;
@@ -242,9 +242,9 @@
* @vol_count: number of volumes in this UBI device
* @volumes: volumes of this UBI device
* @volumes_lock: protects @volumes, @rsvd_pebs, @avail_pebs, beb_rsvd_pebs,
- * @beb_rsvd_level, @bad_peb_count, @good_peb_count, @vol_count, @vol->readers,
- * @vol->writers, @vol->exclusive, @vol->removed, @vol->mapping and
- * @vol->eba_tbl.
+ * @beb_rsvd_level, @bad_peb_count, @good_peb_count, @vol_count,
+ * @vol->readers, @vol->writers, @vol->exclusive,
+ * @vol->ref_count, @vol->mapping and @vol->eba_tbl.
*
* @rsvd_pebs: count of reserved physical eraseblocks
* @avail_pebs: count of available physical eraseblocks
@@ -273,11 +273,11 @@
* @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
+ * @move_to, @move_to_put @erase_pending, @wl_scheduled, and @works
+ * fields
* @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
+ * 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
@@ -308,13 +308,13 @@
* @hdrs_min_io_size
* @vid_hdr_shift: contains @vid_hdr_offset - @vid_hdr_aloffset
* @bad_allowed: whether the MTD device admits of bad physical eraseblocks or
- * not
+ * not
* @mtd: MTD device descriptor
*
* @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
- * @dbg_peb_buf: buffer of PEB size used for debugging
+ * @dbg_peb_buf: buffer of PEB size used for debugging
* @dbg_buf_mutex: proptects @dbg_peb_buf
*/
struct ubi_device {