mtd/ubi/ubi-media.h

55  * initialization UBI finds out that there are available physical eraseblocks
57  * (the physical eraseblocks reserved for bad eraseblocks handling and other
58  * reserved physical eraseblocks are not taken). So, if there is a volume with
70  * of good physical eraseblocks the NAND chip on the device will have, but this
76  * Note, first UBI reserves some amount of physical eraseblocks for bad
78  * means that the pool of reserved physical eraseblocks will always be present.
91  *                       physical eraseblocks, don't allow the wear-leveling
133  * physical eraseblock. These values have to be the same for all physical
162  * @copy_flag: if this logical eraseblock was copied from another physical
171  * @data_pad: how many bytes at the end of this physical eraseblock are not
182  * eraseblock to a new physical eraseblock. The global sequence counter is an
187  * There are 2 situations when there may be more than one physical eraseblock
190  * eraseblock L and it is mapped to the physical eraseblock P.
192  * 1. Because UBI may erase physical eraseblocks asynchronously, the following
194  * erasure, then L is written to,i.e. mapped to another physical eraseblock P1,
196  * physical eraseblocks P and P1 corresponding to the same logical eraseblock
200  * 2. From time to time UBI moves logical eraseblocks to other physical
203  * are two physical eraseblocks P and P1 corresponding to L and UBI has to
206  * it is not enough to select the physical eraseblock with the higher sequence
209  * just select the physical eraseblock with lower sequence number, because the
217  * the @data_crc field of the copy (P1). So when UBI needs to pick one physical
221  * checksum is correct, this physical eraseblock is selected (P1). Otherwise
244  * data of the physical eraseblock was moved by the wear-leveling sub-system,
251  * physical eraseblock was moved to another physical eraseblock for
316  * @reserved_pebs: how many physical eraseblocks are reserved for this volume
318  * @data_pad: how many bytes are unused at the end of the each physical
348  * the physical eraseblocks is used.