page cache
page cache
往bdi_writeback的b_dirty链表上插入node(inode.i_io_list)
__set_page_dirty_nobuffers()里调用__mark_inode_dirty(I_DIRTY_PAGES),这个函数里将此inode的i_state或上I_DIRTY_PAGES flag,并将inode(i_io_list成员)插入bdi_writeback的b_dirty链表上,同时可能会queue一个writeback delayed work(delay 5s)
queue_io将bdi_writeback的b_more_io、b_dirty链表上的node移动到b_io链表上
fs/fs-writeback.c
/* * Queue all expired dirty inodes for io, eldest first. * Before * newly dirtied b_dirty b_io b_more_io * =============> gf edc BA * After * newly dirtied b_dirty b_io b_more_io * =============> g fBAedc * | * +--> dequeue for IO */ static void queue_io(struct bdi_writeback *wb, struct wb_writeback_work *work, unsigned long dirtied_before) { int moved; unsigned long time_expire_jif = dirtied_before; assert_spin_locked(&wb->list_lock); list_splice_init(&wb->b_more_io, &wb->b_io); moved = move_expired_inodes(&wb->b_dirty, &wb->b_io, dirtied_before); if (!work->for_sync) time_expire_jif = jiffies - dirtytime_expire_interval * HZ; moved += move_expired_inodes(&wb->b_dirty_time, &wb->b_io, time_expire_jif); if (moved) wb_io_lists_populated(wb); trace_writeback_queue_io(wb, work, dirtied_before, moved); }
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