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.
To avoid livelocks (when other process dirties new pages), we first tag pages which should be written back with TOWRITE tag and only then
start writing them. For data-integrity sync we have to be careful so that we do not miss some pages (e.g., because some other process has
cleared TOWRITE tag we set). The rule we follow is that TOWRITE tag can be cleared only by the process clearing the DIRTY tag (and
submitting the page for IO).
COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 WRITE_CACHE_PAGES(9)
