find_get_pages

函数名称：d_get_pages_range - gang pagecache lookup*@mapping: The address_space to search*@start: The starting page index*@end: The final page index (inclusive)*@nr_pages: The maximum number of pages*@pages: Where the resulting pages are placed*

函数原型：unsigned find_get_pages_range(struct address_space *mapping, unsigned long *start, unsigned long end, unsigned int nr_pages, struct page **pages)

返回类型：unsigned

参数：

类型	参数	名称
struct address_space *	mapping
unsigned long *	start
unsigned long	end
unsigned int	nr_pages
struct page **	pages

1795

XA_STATE() - Declare an XArray operation state.*@name: Name of this operation state (usually xas).*@array: Array to operate on.*@index: Initial index of interest.* Declare and initialise an xa_state on the stack.(xas, & i_pages, * start)

1797

ret等于0

1799

如果此条件成立可能性小(为编译器优化)(!nr_pages)则返回:0

1802

_read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other

1804

如果xas_retry() - Retry the operation if appropriate.*@xas: XArray operation state.*@entry: Entry from xarray.* The advanced functions may sometimes return an internal entry, such as* a retry entry or a zero entry. This function sets up the @xas to restart则继续下一循环

1807

如果xa_is_value() - Determine if an entry is a value.*@entry: XArray entry.* Context: Any context.* Return: True if the entry is a value, false if it is a pointer.则继续下一循环

1810

如果非page_cache_get_speculative(page)则转到:retry

1814

如果此条件成立可能性小(为编译器优化)(page != xas_reload() - Refetch an entry from the xarray)则转到:put_page

1817

pages[ret]等于find_subpage(page, xa_index)

1818

如果ret先自加恒等于nr_pages则

1819

start等于xa_index加1

1820

转到:out

1822

继续下一循环

1823

put_page :

1824

put_page(page)

1825

retry :

1826

xas_reset() - Reset an XArray operation state.*@xas: XArray operation state.* Resets the error or walk state of the @xas so future walks of the* array will start from the root. Use this if you have dropped the* xarray lock and want to reuse the xa_state.

1835

如果end恒等于The type of an index into the pagecache.减1则start等于The type of an index into the pagecache.减1

1837

否则start等于end加1

1839

out :

1840

_read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()

1842

返回:ret

**调用者**
名称	描述
pagevec_lookup_range	pagevec_lookup_range - gang pagecache lookup@pvec: Where the resulting pages are placed@mapping: The address_space to search@start: The starting page index@end: The final page index* pagevec_lookup_range() will search for & return a group of up to
find_get_pages

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告