diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/jbd2.h | 38 |
1 files changed, 31 insertions, 7 deletions
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h index a53a00d36228..7e785aa6d35d 100644 --- a/include/linux/jbd2.h +++ b/include/linux/jbd2.h @@ -429,22 +429,46 @@ struct jbd2_inode { unsigned long i_flags; /** - * @i_dirty_start: + * @i_dirty_start_page: + * + * Dirty range start in PAGE_SIZE units. + * + * The dirty range is empty if @i_dirty_start_page is greater than or + * equal to @i_dirty_end_page. * - * Offset in bytes where the dirty range for this inode starts. * [j_list_lock] */ - loff_t i_dirty_start; + pgoff_t i_dirty_start_page; /** - * @i_dirty_end: + * @i_dirty_end_page: + * + * Dirty range end in PAGE_SIZE units (exclusive). * - * Inclusive offset in bytes where the dirty range for this inode - * ends. [j_list_lock] + * [j_list_lock] */ - loff_t i_dirty_end; + pgoff_t i_dirty_end_page; }; +/* + * Lockless readers treat start_page >= end_page as an empty range. + * Writers publish a new non-empty range by storing i_dirty_end_page before + * i_dirty_start_page. + */ +static inline bool jbd2_jinode_get_dirty_range(const struct jbd2_inode *jinode, + loff_t *start, loff_t *end) +{ + pgoff_t start_page = READ_ONCE(jinode->i_dirty_start_page); + pgoff_t end_page = READ_ONCE(jinode->i_dirty_end_page); + + if (start_page >= end_page) + return false; + + *start = (loff_t)start_page << PAGE_SHIFT; + *end = ((loff_t)end_page << PAGE_SHIFT) - 1; + return true; +} + struct jbd2_revoke_table_s; /** |