mtd/ubi/ubi-media.h

56  * initialization UBI finds out that there are available physical eraseblocks
58  * (the physical eraseblocks reserved for bad eraseblocks handling and other
59  * reserved physical eraseblocks are not taken). So, if there is a volume with
71  * of good physical eraseblocks the NAND chip on the device will have, but this
77  * Note, first UBI reserves some amount of physical eraseblocks for bad
79  * means that the pool of reserved physical eraseblocks will always be present.
92  *                       physical eraseblocks, don't allow the wear-leveling
134  * physical eraseblock. These values have to be the same for all physical
163  * @copy_flag: if this logical eraseblock was copied from another physical
172  * @data_pad: how many bytes at the end of this physical eraseblock are not
183  * eraseblock to a new physical eraseblock. The global sequence counter is an
188  * There are 2 situations when there may be more than one physical eraseblock
191  * eraseblock L and it is mapped to the physical eraseblock P.
193  * 1. Because UBI may erase physical eraseblocks asynchronously, the following
195  * erasure, then L is written to,i.e. mapped to another physical eraseblock P1,
197  * physical eraseblocks P and P1 corresponding to the same logical eraseblock
201  * 2. From time to time UBI moves logical eraseblocks to other physical
204  * are two physical eraseblocks P and P1 corresponding to L and UBI has to
207  * it is not enough to select the physical eraseblock with the higher sequence
210  * just select the physical eraseblock with lower sequence number, because the
218  * the @data_crc field of the copy (P1). So when UBI needs to pick one physical
222  * checksum is correct, this physical eraseblock is selected (P1). Otherwise
245  * data of the physical eraseblock was moved by the wear-leveling sub-system,
252  * physical eraseblock was moved to another physical eraseblock for
317  * @reserved_pebs: how many physical eraseblocks are reserved for this volume
319  * @data_pad: how many bytes are unused at the end of the each physical
349  * the physical eraseblocks is used.