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Andrew Morton authored
This patch fixes a filesystem corrupting bug, present in 2.5.41 through 2.5.44. It can cause ext2 indirect blocks to not be written out. A fsck will fix it up. Under heavy memory pressure a PF_MEMALLOC task attemtps to write out a blockdev page whose buffers are already under writeback and which were dirtied while under writeback. The writepage call returns -EAGAIN but because the caller is PF_MEMALLOC, the page was not being marked dirty again. The page sits on mapping->clean_pages for ever and it not written out. The fix is to mark that page dirty again for all callers, regardless of PF_MEMALLOC state.
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