Module kdevice::log

Log layer supporting transaction operations on blocks.

The isolation level is Read Committed.

Structs

Log	Generic log layer with buffer cache.
OpGuard	Returned by end_op.

Constants

LOGMAGIC	Magic value in the header.
LOGSIZE	Maximum number of blocks to be trace by log. Note that the log layer use additional one block to store log header. Thus, the total number of blocks used by log is LOGSIZE + 1, which is exactly BSIZE.
MAXEXOPBLOCKS	Maximum number of blocks per exclusive transactional operation.
MAXOPBLOCKS	Maximum number of blocks per transactional operation. The caller should guarantee this between each pair of begin_op and end_op.
NBUF	Number of in-memory buffer. Theoretically, LOGSIZE + 2(one for log header and one for install_trans) is enough.