get_unlocked

函数名称：Look up entry in page cache, wait for it to become unlocked if it* is a DAX entry and return it. The caller must subsequently call* put_unlocked_entry() if it did not lock the entry or dax_unlock_entry()* if it did

函数原型：static void *get_unlocked_entry(struct xa_state *xas, unsigned int order)

返回类型：void

参数：

类型	参数	名称
struct xa_state *	xas
unsigned int	order

218

init_wait( & wait)

219

func等于wake_exceptional_entry_func

221

循环

222

entry等于xas_find_conflict() - Find the next present entry in a range.*@xas: XArray operation state.* The @xas describes both a range and a position within that range.* Context: Any context. Expects xa_lock to be held.

223

如果非entry或WARN_ON_ONCE(!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.)则返回:entry

225

如果dax_entry_order(entry)小于order则返回:XA_RETRY_ENTRY

227

如果非dax_is_locked(entry)则返回:entry

230

wq等于dax_entry_waitqueue(xas, entry, & key)

231

prepare_to_wait_exclusive(wq, & wait, 深度睡眠态)

233

xas_unlock_irq(xas)

234

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.

235

进程调度

236

sh_wait - clean up after waiting in a queue*@wq_head: waitqueue waited on*@wq_entry: wait descriptor* Sets current thread back to running state and removes* the wait descriptor from the given waitqueue if still* queued.

237

xas_lock_irq(xas)

**调用者**
名称	描述
grab_mapping_entry	Find page cache entry at given index. If it is a DAX entry, return it* with the entry locked. If the page cache doesn't contain an entry at* that index, add a locked empty entry.* When requesting an entry with size DAX_PMD, grab_mapping_entry() will
dax_layout_busy_page	dax_layout_busy_page - find first pinned page in @mapping@mapping: address space to scan for a page with ref count > 1 DAX requires ZONE_DEVICE mapped pages. These pages are never* 'onlined' to the page allocator so they are considered idle when
__dax_invalidate_entry
dax_writeback_one
dax_insert_pfn_mkwrite	dax_insert_pfn_mkwrite - insert PTE or PMD entry into page tables@vmf: The description of the fault@pfn: PFN to insert@order: Order of entry to insert. This function inserts a writeable PTE or PMD entry into the page tables* for an mmaped DAX file

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