mtd/ubi/ubi-media.h

57  * initialization UBI finds out that there are available physical eraseblocks
59  * (the physical eraseblocks reserved for bad eraseblocks handling and other
60  * reserved physical eraseblocks are not taken). So, if there is a volume with
72  * of good physical eraseblocks the NAND chip on the device will have, but this
78  * Note, first UBI reserves some amount of physical eraseblocks for bad
80  * means that the pool of reserved physical eraseblocks will always be present.
94  *                       physical eraseblocks, don't allow the wear-leveling
136  * physical eraseblock. These values have to be the same for all physical
165  * @copy_flag: if this logical eraseblock was copied from another physical
174  * @data_pad: how many bytes at the end of this physical eraseblock are not
185  * eraseblock to a new physical eraseblock. The global sequence counter is an
190  * There are 2 situations when there may be more than one physical eraseblock
193  * eraseblock L and it is mapped to the physical eraseblock P.
195  * 1. Because UBI may erase physical eraseblocks asynchronously, the following
197  * erasure, then L is written to,i.e. mapped to another physical eraseblock P1,
199  * physical eraseblocks P and P1 corresponding to the same logical eraseblock
203  * 2. From time to time UBI moves logical eraseblocks to other physical
206  * are two physical eraseblocks P and P1 corresponding to L and UBI has to
209  * it is not enough to select the physical eraseblock with the higher sequence
212  * just select the physical eraseblock with lower sequence number, because the
220  * the @data_crc field of the copy (P1). So when UBI needs to pick one physical
224  * checksum is correct, this physical eraseblock is selected (P1). Otherwise
247  * data of the physical eraseblock was moved by the wear-leveling sub-system,
254  * physical eraseblock was moved to another physical eraseblock for
319  * @reserved_pebs: how many physical eraseblocks are reserved for this volume
321  * @data_pad: how many bytes are unused at the end of the each physical
351  * the physical eraseblocks is used.