xas_reset

函数名称：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.

函数原型：static inline void xas_reset(struct xa_state *xas)

返回类型：void

参数：

类型	参数	名称
struct xa_state *	xas

**调用者**
名称	描述
check_xas_retry
check_xa_mark_2
find_get_entry	d_get_entry - find and get a page cache entry@mapping: the address_space to search@offset: the page cache index* Looks up the page cache slot at @mapping & @offset
find_get_entries	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
find_get_pages_range	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
find_get_pages_contig	d_get_pages_contig - gang contiguous pagecache lookup@mapping: The address_space to search@index: The starting page index@nr_pages: The maximum number of pages@pages: Where the resulting pages are placed* find_get_pages_contig() works exactly like
find_get_pages_range_tag	d_get_pages_range_tag - find and return pages in given range matching @tag@mapping: the address_space to search@index: the starting page index@end: The final page index (inclusive)@tag: the tag index@nr_pages: the maximum number of pages@pages:
get_unlocked_entry	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
dax_unlock_entry	We used the xa_state to get the entry, but then we locked the entry and* dropped the xa_lock, so we know the xa_state is stale and must be reset* before use.
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_insert_entry	By this point grab_mapping_entry() has ensured that we have a locked entry* of the appropriate size so we don't have to worry about downgrading PMDs to* PTEs
dax_writeback_one
xas_retry	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

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