PAGE_CACHE_PREV_HOLE(9)

NAME
page_cache_prev_hole - find the prev hole (not-present entry)

SYNOPSIS

pgoff_t page_cache_prev_hole(struct address_space * mapping, pgoff_t index, unsigned long max_scan);

ARGUMENTS

mapping
    mapping

index
    index

max_scan
    maximum range to search

DESCRIPTION

Search backwards in the range [max(index-max_scan+1, 0), index] for the first hole.

RETURN

the index of the hole if found, otherwise returns an index outside of the set specified (in which case 'index - return >= max_scan' will be true). In rare cases of wrap-around, ULONG_MAX will be returned.

page_cache_prev_hole may be called under rcu_read_lock. However, like radix_tree_gang_lookup, this will not atomically search a snapshot of the tree at a single point in time. For example, if a hole is created at index 10, then subsequently a hole is created at index 5, page_cache_prev_hole covering both indexes may return 5 if called under rcu_read_lock.

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