mtd/ubi/eba.c

11  * This sub-system is responsible for I/O to/from logical eraseblock.
17  * The EBA sub-system implements per-logical eraseblock locking. Before
18  * accessing a logical eraseblock it is locked for reading or writing. The
19  * per-logical eraseblock locking is implemented by means of the lock tree. The
20  * lock tree is an RB-tree which refers all the currently locked logical
25  * time a logical eraseblock is mapped to a physical eraseblock and it is
82  * @lnum: logical eraseblock number
85  * object if the logical eraseblock is locked and %NULL if it is not.
120  * @lnum: logical eraseblock number
122  * This function adds new entry for logical eraseblock (@vol_id, @lnum) to the
146 		 * This logical eraseblock is already locked. The newly  in ltree_add_entry()
189  * leb_read_lock - lock logical eraseblock for reading.
192  * @lnum: logical eraseblock number
194  * This function locks a logical eraseblock for reading. Returns zero in case
209  * leb_read_unlock - unlock logical eraseblock.
212  * @lnum: logical eraseblock number
231  * leb_write_lock - lock logical eraseblock for writing.
234  * @lnum: logical eraseblock number
236  * This function locks a logical eraseblock for writing. Returns zero in case
251  * leb_write_lock - lock logical eraseblock for writing.
254  * @lnum: logical eraseblock number
256  * This function locks a logical eraseblock for writing if there is no
285  * leb_write_unlock - unlock logical eraseblock.
288  * @lnum: logical eraseblock number
307  * ubi_eba_unmap_leb - un-map logical eraseblock.
310  * @lnum: logical eraseblock number
312  * This function un-maps logical eraseblock @lnum and schedules corresponding
330 		/* This logical eraseblock is already unmapped */  in ubi_eba_unmap_leb()
349  * @lnum: logical eraseblock number
355  * If the logical eraseblock @lnum is unmapped, @buf is filled with 0xFF
378 		 * The logical eraseblock is not mapped, fill the whole buffer  in ubi_eba_read_leb()
380 		 * it is an error to read unmapped logical eraseblocks.  in ubi_eba_read_leb()
481  * @lnum: logical eraseblock number
538  * @lnum: logical eraseblock number
644  * @lnum: logical eraseblock number
646  * @offset: offset within the logical eraseblock where to write
649  * This function writes data to logical eraseblock @lnum of a dynamic volume
686 	 * The logical eraseblock is not mapped. We have to get a free physical  in ubi_eba_write_leb()
769  * @lnum: logical eraseblock number
772  * @used_ebs: how many logical eraseblocks will this volume contain
774  * This function writes data to logical eraseblock @lnum of static volume
775  * @vol. The @used_ebs argument should contain total number of logical
778  * When writing to the last logical eraseblock, the @len argument doesn't have
783  * It is prohibited to write more than once to logical eraseblocks of static
888  * ubi_eba_atomic_leb_change - change logical eraseblock atomically.
891  * @lnum: logical eraseblock number
895  * This function changes the contents of a logical eraseblock atomically. @buf
896  * has to contain new logical eraseblock data, and @len - the length of the
1040  * ubi_eba_copy_leb - copy logical eraseblock.
1046  * This function copies logical eraseblock from physical eraseblock @from to
1076 	 * this logical eraseblock belongs to might be being deleted. Since the  in ubi_eba_copy_leb()
1077 	 * volume deletion un-maps all the volume's logical eraseblocks, it will  in ubi_eba_copy_leb()
1089 	 * We do not want anybody to write to this logical eraseblock while we  in ubi_eba_copy_leb()