diff options
| -rw-r--r-- | module/zfs/abd.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/module/zfs/abd.c b/module/zfs/abd.c index 8b2514404..ac6b0b742 100644 --- a/module/zfs/abd.c +++ b/module/zfs/abd.c @@ -245,6 +245,32 @@ abd_chunkcnt_for_bytes(size_t size) } #ifdef _KERNEL +/* + * Mark zfs data pages so they can be excluded from kernel crash dumps + */ +#ifdef _LP64 +#define ABD_FILE_CACHE_PAGE 0x2F5ABDF11ECAC4E + +static inline void +abd_mark_zfs_page(struct page *page) +{ + get_page(page); + SetPagePrivate(page); + set_page_private(page, ABD_FILE_CACHE_PAGE); +} + +static inline void +abd_unmark_zfs_page(struct page *page) +{ + set_page_private(page, 0UL); + ClearPagePrivate(page); + put_page(page); +} +#else +#define abd_mark_zfs_page(page) +#define abd_unmark_zfs_page(page) +#endif /* _LP64 */ + #ifndef CONFIG_HIGHMEM #ifndef __GFP_RECLAIM @@ -318,6 +344,7 @@ abd_alloc_pages(abd_t *abd, size_t size) size_t sg_size = MIN(PAGESIZE << compound_order(page), remaining_size); sg_set_page(sg, page, sg_size, 0); + abd_mark_zfs_page(page); remaining_size -= sg_size; sg = sg_next(sg); @@ -404,6 +431,7 @@ abd_alloc_pages(abd_t *abd, size_t size) ABDSTAT_BUMP(abdstat_scatter_orders[0]); sg_set_page(sg, page, PAGESIZE, 0); + abd_mark_zfs_page(page); } if (nr_pages > 1) { @@ -430,6 +458,7 @@ abd_free_pages(abd_t *abd) abd_for_each_sg(abd, sg, nr_pages, i) { page = sg_page(sg); + abd_unmark_zfs_page(page); order = compound_order(page); __free_pages(page, order); ASSERT3U(sg->length, <=, PAGE_SIZE << order); |