 |
 |
 |
 |
 |
|
|
|
|
|
|
|
If a buffer is withdrawn temporarily from the “av”-list, then its “B_BUSY” flag is raised.
If the contents of a buffer correctly reflect the information that is or should be stored on disk, then the “B_DONE” flag is raised.
If the “B_DELWRI” flag is raised, the contents of the buffer are more up to date than the contents of the corresponding disk block, and hence the buffer must be written out before it can be reassigned.
|
|
|
|
|
|