mpage_writepages man page on Scientific

mpage_writepages man page on Scientific

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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 2.6.	 November 2013		   MPAGE_WRITEPAGES(9)

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