diff options
Diffstat (limited to 'include/linux/pagemap.h')
| -rw-r--r-- | include/linux/pagemap.h | 29 |
1 files changed, 15 insertions, 14 deletions
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index ccb14b6a16b5..a8f7bd8ea1c6 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -33,8 +33,8 @@ enum mapping_flags { /** * mapping_set_error - record a writeback error in the address_space - * @mapping - the mapping in which an error should be set - * @error - the error to set in the mapping + * @mapping: the mapping in which an error should be set + * @error: the error to set in the mapping * * When writeback fails in some way, we must record that error so that * userspace can be informed when fsync and the like are called. We endeavor @@ -70,11 +70,9 @@ static inline void mapping_clear_unevictable(struct address_space *mapping) clear_bit(AS_UNEVICTABLE, &mapping->flags); } -static inline int mapping_unevictable(struct address_space *mapping) +static inline bool mapping_unevictable(struct address_space *mapping) { - if (mapping) - return test_bit(AS_UNEVICTABLE, &mapping->flags); - return !!mapping; + return mapping && test_bit(AS_UNEVICTABLE, &mapping->flags); } static inline void mapping_set_exiting(struct address_space *mapping) @@ -305,9 +303,9 @@ static inline struct page *find_lock_page(struct address_space *mapping, * atomic allocation! */ static inline struct page *find_or_create_page(struct address_space *mapping, - pgoff_t offset, gfp_t gfp_mask) + pgoff_t index, gfp_t gfp_mask) { - return pagecache_get_page(mapping, offset, + return pagecache_get_page(mapping, index, FGP_LOCK|FGP_ACCESSED|FGP_CREAT, gfp_mask); } @@ -333,14 +331,17 @@ static inline struct page *grab_cache_page_nowait(struct address_space *mapping, mapping_gfp_mask(mapping)); } -static inline struct page *find_subpage(struct page *page, pgoff_t offset) +/* + * Given the page we found in the page cache, return the page corresponding + * to this index in the file + */ +static inline struct page *find_subpage(struct page *head, pgoff_t index) { - if (PageHuge(page)) - return page; - - VM_BUG_ON_PAGE(PageTail(page), page); + /* HugeTLBfs wants the head page regardless */ + if (PageHuge(head)) + return head; - return page + (offset & (compound_nr(page) - 1)); + return head + (index & (hpage_nr_pages(head) - 1)); } struct page *find_get_entry(struct address_space *mapping, pgoff_t offset); |