This new function will do all the hard work to reserve precious space
for a write.
The overall work flow will be the following.
File A already has some dirty pages:
0 4K 8K 12K 16K
|///| |///|
And then, someone want to write some data into range [4K, 16K).
This new function will do all the hard work to reserve precious space
for a write.
The overall work flow will be the following.
File A already has some dirty pages:
0 4K 8K 12K 16K
|///| |///|
And then, someone want to write some data into range [4K, 16K).
