函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\filemap.c Create Date:2022-07-27 15:24:47
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：d_get_entries - gang pagecache lookup*@mapping: The address_space to search*@start: The starting page cache index*@nr_entries: The maximum number of entries*@entries: Where the resulting entries are placed*@indices: The cache indices corresponding to the

函数原型：unsigned find_get_entries(struct address_space *mapping, unsigned long start, unsigned int nr_entries, struct page **entries, unsigned long *indices)

返回类型：unsigned

参数：

类型参数名称
struct address_space *mapping
unsigned longstart
unsigned intnr_entries
struct page **entries
unsigned long *indices
1728  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)
1730  ret等于0
1732  如果非nr_entries则返回:0
1735  _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
1737  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
1744  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.则转到:export
1747  如果非page_cache_get_speculative(page)则转到:retry
1751  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
1753  page等于find_subpage(page, xa_index)
1755  export :
1756  indices[ret]等于xa_index
1757  entries[ret]等于page
1758  如果ret先自加恒等于nr_entries则退出
1760  继续下一循环
1761  put_page :
1762  put_page(page)
1763  retry :
1764  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.
1766  _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()
1767  返回:ret
调用者
名称描述
pagevec_lookup_entriespagevec_lookup_entries - gang pagecache lookup*@pvec: Where the resulting entries are placed*@mapping: The address_space to search*@start: The starting entry index*@nr_entries: The maximum number of pages*@indices: The cache indices corresponding to the