diff options
| -rw-r--r-- | fs/btrfs/inode.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index a88130c7782e..3b2403b6127f 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -10269,9 +10269,19 @@ static int btrfs_add_swap_extent(struct swap_info_struct *sis, struct btrfs_swap_info *bsi) { unsigned long nr_pages; + unsigned long max_pages; u64 first_ppage, first_ppage_reported, next_ppage; int ret; + /* + * Our swapfile may have had its size extended after the swap header was + * written. In that case activating the swapfile should not go beyond + * the max size set in the swap header. + */ + if (bsi->nr_pages >= sis->max) + return 0; + + max_pages = sis->max - bsi->nr_pages; first_ppage = ALIGN(bsi->block_start, PAGE_SIZE) >> PAGE_SHIFT; next_ppage = ALIGN_DOWN(bsi->block_start + bsi->block_len, PAGE_SIZE) >> PAGE_SHIFT; @@ -10279,6 +10289,7 @@ static int btrfs_add_swap_extent(struct swap_info_struct *sis, if (first_ppage >= next_ppage) return 0; nr_pages = next_ppage - first_ppage; + nr_pages = min(nr_pages, max_pages); first_ppage_reported = first_ppage; if (bsi->start == 0) |