diff options
| -rw-r--r-- | include/linux/pagemap.h | 12 | ||||
| -rw-r--r-- | mm/page-writeback.c | 4 | ||||
| -rw-r--r-- | mm/swap_state.c | 2 |
3 files changed, 16 insertions, 2 deletions
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 01e84436cddf..48d9cf04337c 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -25,6 +25,8 @@ enum mapping_flags { AS_MM_ALL_LOCKS = __GFP_BITS_SHIFT + 2, /* under mm_take_all_locks() */ AS_UNEVICTABLE = __GFP_BITS_SHIFT + 3, /* e.g., ramdisk, SHM_LOCK */ AS_EXITING = __GFP_BITS_SHIFT + 4, /* final truncate in progress */ + /* writeback related tags are not used */ + AS_NO_WRITEBACK_TAGS = __GFP_BITS_SHIFT + 5, }; static inline void mapping_set_error(struct address_space *mapping, int error) @@ -64,6 +66,16 @@ static inline int mapping_exiting(struct address_space *mapping) return test_bit(AS_EXITING, &mapping->flags); } +static inline void mapping_set_no_writeback_tags(struct address_space *mapping) +{ + set_bit(AS_NO_WRITEBACK_TAGS, &mapping->flags); +} + +static inline int mapping_use_writeback_tags(struct address_space *mapping) +{ + return !test_bit(AS_NO_WRITEBACK_TAGS, &mapping->flags); +} + static inline gfp_t mapping_gfp_mask(struct address_space * mapping) { return (__force gfp_t)mapping->flags & __GFP_BITS_MASK; diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 5ed3381818ec..439cc63ad903 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -2716,7 +2716,7 @@ int test_clear_page_writeback(struct page *page) int ret; lock_page_memcg(page); - if (mapping) { + if (mapping && mapping_use_writeback_tags(mapping)) { struct inode *inode = mapping->host; struct backing_dev_info *bdi = inode_to_bdi(inode); unsigned long flags; @@ -2759,7 +2759,7 @@ int __test_set_page_writeback(struct page *page, bool keep_write) int ret; lock_page_memcg(page); - if (mapping) { + if (mapping && mapping_use_writeback_tags(mapping)) { struct inode *inode = mapping->host; struct backing_dev_info *bdi = inode_to_bdi(inode); unsigned long flags; diff --git a/mm/swap_state.c b/mm/swap_state.c index c8310a37be3a..268b8191982b 100644 --- a/mm/swap_state.c +++ b/mm/swap_state.c @@ -37,6 +37,8 @@ struct address_space swapper_spaces[MAX_SWAPFILES] = { .page_tree = RADIX_TREE_INIT(GFP_ATOMIC|__GFP_NOWARN), .i_mmap_writable = ATOMIC_INIT(0), .a_ops = &swap_aops, + /* swap cache doesn't use writeback related tags */ + .flags = 1 << AS_NO_WRITEBACK_TAGS, } }; |