1WRITE_CACHE_PAGES(9)      Memory Management in Linux      WRITE_CACHE_PAGES(9)
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NAME

6       write_cache_pages - walk the list of dirty pages of the given address
7       space and write all of them.
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SYNOPSIS

10       int write_cache_pages(struct address_space * mapping,
11                             struct writeback_control * wbc,
12                             writepage_t writepage, void * data);
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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       writepage
22           function called for each page
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24       data
25           data passed to writepage function
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DESCRIPTION

28       If a page is already under I/O, write_cache_pages skips it, even if
29       it's dirty. This is desirable behaviour for memory-cleaning writeback,
30       but it is INCORRECT for data-integrity system calls such as fsync.
31       fsync and msync need to guarantee that all the data which was dirty at
32       the time the call was made get new I/O started against them. If
33       wbc->sync_mode is WB_SYNC_ALL then we were called for data integrity
34       and we must wait for existing IO to complete.
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37Kernel Hackers Manual 2.6.       November 2011            WRITE_CACHE_PAGES(9)
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