find_get_pages_range_tag

Name: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:

Proto:unsigned find_get_pages_range_tag(struct address_space *mapping, unsigned long *index, unsigned long end, xa_mark_t tag, unsigned int nr_pages, struct page **pages)

Type:unsigned

Parameter:

Type	Parameter	Name
struct address_space *	mapping
unsigned long *	index
unsigned long	end
xa_mark_t	tag
unsigned int	nr_pages
struct page **	pages

1917

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, * index)

1919

ret = 0

1921

If Value for the false possibility is greater at compile time(!nr_pages) Then Return 0

1924

_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

1926

If 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 Then Continue

1933

If 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. Then Continue

1936

If Not page_cache_get_speculative(page) Then Go to retry

1940

If Value for the false possibility is greater at compile time(page != xas_reload() - Refetch an entry from the xarray) Then Go to put_page

1943

pages[ret] = find_subpage(page, xa_index)

1944

If ++ret == nr_pages Then

1945

index = xa_index + 1

1946

Go to out

1948

Continue

1949

1950

1951

retry :

1952

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.

1961

If end == The type of an index into the pagecache - 1 Then index = The type of an index into the pagecache - 1

1963

Else index = end + 1

1965

out :

1966

_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()

1968

Return ret

**Caller**
Name	Describe
pagevec_lookup_range_tag
pagevec_lookup_range_nr_tag
find_get_pages_tag

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