mtd/ubi/eba.c

12  * This sub-system is responsible for I/O to/from logical eraseblock.
18  * The EBA sub-system implements per-logical eraseblock locking. Before
19  * accessing a logical eraseblock it is locked for reading or writing. The
20  * per-logical eraseblock locking is implemented by means of the lock tree. The
21  * lock tree is an RB-tree which refers all the currently locked logical
26  * time a logical eraseblock is mapped to a physical eraseblock and it is
83  * @lnum: logical eraseblock number
86  * object if the logical eraseblock is locked and %NULL if it is not.
121  * @lnum: logical eraseblock number
123  * This function adds new entry for logical eraseblock (@vol_id, @lnum) to the
147 		 * This logical eraseblock is already locked. The newly  in ltree_add_entry()
190  * leb_read_lock - lock logical eraseblock for reading.
193  * @lnum: logical eraseblock number
195  * This function locks a logical eraseblock for reading. Returns zero in case
210  * leb_read_unlock - unlock logical eraseblock.
213  * @lnum: logical eraseblock number
232  * leb_write_lock - lock logical eraseblock for writing.
235  * @lnum: logical eraseblock number
237  * This function locks a logical eraseblock for writing. Returns zero in case
252  * leb_write_lock - lock logical eraseblock for writing.
255  * @lnum: logical eraseblock number
257  * This function locks a logical eraseblock for writing if there is no
286  * leb_write_unlock - unlock logical eraseblock.
289  * @lnum: logical eraseblock number
308  * ubi_eba_unmap_leb - un-map logical eraseblock.
311  * @lnum: logical eraseblock number
313  * This function un-maps logical eraseblock @lnum and schedules corresponding
331 		/* This logical eraseblock is already unmapped */  in ubi_eba_unmap_leb()
350  * @lnum: logical eraseblock number
356  * If the logical eraseblock @lnum is unmapped, @buf is filled with 0xFF
379 		 * The logical eraseblock is not mapped, fill the whole buffer  in ubi_eba_read_leb()
381 		 * it is an error to read unmapped logical eraseblocks.  in ubi_eba_read_leb()
482  * @lnum: logical eraseblock number
539  * @lnum: logical eraseblock number
645  * @lnum: logical eraseblock number
647  * @offset: offset within the logical eraseblock where to write
650  * This function writes data to logical eraseblock @lnum of a dynamic volume
687 	 * The logical eraseblock is not mapped. We have to get a free physical  in ubi_eba_write_leb()
770  * @lnum: logical eraseblock number
773  * @used_ebs: how many logical eraseblocks will this volume contain
775  * This function writes data to logical eraseblock @lnum of static volume
776  * @vol. The @used_ebs argument should contain total number of logical
779  * When writing to the last logical eraseblock, the @len argument doesn't have
784  * It is prohibited to write more than once to logical eraseblocks of static
889  * ubi_eba_atomic_leb_change - change logical eraseblock atomically.
892  * @lnum: logical eraseblock number
896  * This function changes the contents of a logical eraseblock atomically. @buf
897  * has to contain new logical eraseblock data, and @len - the length of the
1041  * ubi_eba_copy_leb - copy logical eraseblock.
1047  * This function copies logical eraseblock from physical eraseblock @from to
1077 	 * this logical eraseblock belongs to might be being deleted. Since the  in ubi_eba_copy_leb()
1078 	 * volume deletion un-maps all the volume's logical eraseblocks, it will  in ubi_eba_copy_leb()
1090 	 * We do not want anybody to write to this logical eraseblock while we  in ubi_eba_copy_leb()