mpage_writepages(9)
NAME
mpage_writepages - walk the list of dirty pages of the given address
space & writepage all of them
SYNOPSIS
int mpage_writepages(struct address_space * mapping,
struct writeback_control * wbc,
get_block_t get_block);
ARGUMENTS
- mapping
- address space structure to write
- wbc
- subtract the number of written pages from *wbc->nr_to_write
- get_block
- the filesystem´s block mapper function. If this is NULL then use
a_ops->writepage. Otherwise, go direct-to-BIO.
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
it´s 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.