WRITE_CACHE_PAGES(9) Memory Management in Linux WRITE_CACHE_PAGES(9)
NAME
write_cache_pages - walk the list of dirty pages of the given address space and write all of them.
SYNOPSIS
int write_cache_pages(struct address_space * mapping, struct writeback_control * wbc, writepage_t writepage, void * data);
ARGUMENTS
mapping
address space structure to write
wbc
subtract the number of written pages from *wbc->nr_to_write
writepage
function called for each page
data
data passed to writepage function
DESCRIPTION
If a page is already under I/O, write_cache_pages 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.
COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 WRITE_CACHE_PAGES(9)
