MPAGE_WRITEPAGES(9)                       The Linux VFS                       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.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                       MPAGE_WRITEPAGES(9)