1MPAGE_WRITEPAGES(9)              The Linux VFS             MPAGE_WRITEPAGES(9)
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NAME

6       mpage_writepages - walk the list of dirty pages of the given address
7       space & writepage all of them
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SYNOPSIS

10       int mpage_writepages(struct address_space * mapping,
11                            struct writeback_control * wbc,
12                            get_block_t get_block);
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ARGUMENTS

15       mapping
16           address space structure to write
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18       wbc
19           subtract the number of written pages from *wbc->nr_to_write
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21       get_block
22           the filesystem´s block mapper function. If this is NULL then use
23           a_ops->writepage. Otherwise, go direct-to-BIO.
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DESCRIPTION

26       This is a library function, which implements the writepages
27       address_space_operation.
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29       If a page is already under I/O, generic_writepages skips it, even if
30       it´s dirty. This is desirable behaviour for memory-cleaning writeback,
31       but it is INCORRECT for data-integrity system calls such as fsync.
32       fsync and msync need to guarantee that all the data which was dirty at
33       the time the call was made get new I/O started against them. If
34       wbc->sync_mode is WB_SYNC_ALL then we were called for data integrity
35       and we must wait for existing IO to complete.
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38Kernel Hackers Manual 2.6.         June 2019               MPAGE_WRITEPAGES(9)
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