看源码笔记

LIST_HEAD(name)  定义name 链表，并初始化。

HLIST_HEAD(name)  定义name 哈希链表，并初始化。

init_waitqueue_head

add_wait_queue

add_wait_queue_exclusive

remove_wait_queue

prepare_to_wait

prepare_to_wait_exclusive

finish_wait

autoremove_wake_function

wake_bit_function

__wait_on_bit

out_of_line_wait_on_bit

__wait_on_bit_lock

out_of_line_wait_on_bit_lock

__wake_up_bit

wake_up_bit

bit_waitqueue         a standard hashed waitqueue table for generic use

 int wait_on_bit(void *word, int bit,

int (*action)(void *), unsigned mode)   wait for a bit to be cleared

用法详见：

static void __wait_on_freeing_inode(struct inode *inode)

{

wait_queue_head_t *wq;

DEFINE_WAIT_BIT(wait, &inode->i_state, __I_LOCK);

wq = bit_waitqueue(&inode->i_state, __I_LOCK);

prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE);

spin_unlock(&inode_lock);

schedule();

finish_wait(wq, &wait.wait);

spin_lock(&inode_lock);

}

static inline void wait_on_inode(struct inode *inode)

{

might_sleep();

wait_on_bit(&inode->i_state, __I_LOCK, inode_wait,

TASK_UNINTERRUPTIBLE);

}

inode的内存cache ：inode_hashtable  全局哈希链表

/*

 * second extended-fs super-block data in memory

 */

struct ext2_sb_info 

计算方法：ext2_get_group_desc

/*

 * second extended file system inode data in memory

 */

struct ext2_inode_info {

new_inode->alloc_inode  ,给inode->i_mapping 赋值

更新超级块，使用struct writeback_control 样例：

int ext2_sync_inode(struct inode *inode)

{

struct writeback_control wbc = {

.sync_mode = WB_SYNC_ALL,

.nr_to_write = 0, /* sys_fsync did this */

};

return sync_inode(inode, &wbc);

}

filemap_fdatawait - wait for all under-writeback pages to complete

/*

 * Track a single file's readahead state

 */

struct file_ra_state 

预读接口

default_backing_dev_info

file_ra_state_init

page_cache_sync_readahead

page_cache_async_readahead

Page_cache接口

filemap_fdatawrite

filemap_flush

sync_page_range

sync_page_range_nolock

filemap_fdatawait

filemap_write_and_wait

add_to_page_cache

__page_cache_alloc

wait_on_page_bit

unlock_page

end_page_writeback

__lock_page

find_get_page

find_lock_page

find_or_create_page

find_get_pages_contig

find_get_pages_tag

grab_cache_page_nowait

do_generic_mapping_read

generic_segment_checks

generic_file_aio_read

filemap_fault

generic_file_mmap

generic_file_readonly_mmap

read_cache_page_async

read_cache_page

should_remove_suid

remove_suid

iov_iter_copy_from_user_atomic

iov_iter_copy_from_user

iov_iter_advance

iov_iter_fault_in_readable

iov_iter_single_seg_count

generic_write_checks

pagecache_write_begin

pagecache_write_end

generic_file_direct_write

__grab_cache_page

generic_file_buffered_write

generic_file_aio_write_nolock

generic_file_aio_write

try_to_release_page