mpage_writepages - walk the list of dirty pages of the given address space & writepage all of them
2. SYNOPSIS ▲
int mpage_writepages(struct address_space * mapping , struct writeback_control * wbc , get_block_t get_block );
3. ARGUMENTS ▲
address space structure to write
subtract the number of written pages from *wbc->nr_to_write
the filesystemAqs block mapper function. If this is NULL then use a_ops->writepage. Otherwise, go direct-to-BIO.
4. DESCRIPTION ▲
This is a library function, which implements the writepages address_space_operation.
If a page is already under I/O, generic_writepages skips it, even if itAqs dirty. This is desirable behaviour for memory-cleaning writeback, but it is INCORRECT for data-integrity system calls such as fsync. fsync and msync need to guarantee that all the data which was dirty at the time the call was made get new I/O started against them. If wbc->sync_mode is WB_SYNC_ALL then we were called for data integrity and we must wait for existing IO to complete.
5. COPYRIGHT ▲