diff options
Diffstat (limited to 'fs/btrfs/subpage.c')
| -rw-r--r-- | fs/btrfs/subpage.c | 30 |
1 files changed, 24 insertions, 6 deletions
diff --git a/fs/btrfs/subpage.c b/fs/btrfs/subpage.c index a3e5b6a13d54..61b28dfca20c 100644 --- a/fs/btrfs/subpage.c +++ b/fs/btrfs/subpage.c @@ -7,7 +7,8 @@ int btrfs_attach_subpage(const struct btrfs_fs_info *fs_info, struct page *page, enum btrfs_subpage_type type) { - struct btrfs_subpage *subpage; + struct btrfs_subpage *subpage = NULL; + int ret; /* * We have cases like a dummy extent buffer page, which is not mappped @@ -19,11 +20,9 @@ int btrfs_attach_subpage(const struct btrfs_fs_info *fs_info, if (fs_info->sectorsize == PAGE_SIZE || PagePrivate(page)) return 0; - subpage = kzalloc(sizeof(struct btrfs_subpage), GFP_NOFS); - if (!subpage) - return -ENOMEM; - - spin_lock_init(&subpage->lock); + ret = btrfs_alloc_subpage(fs_info, &subpage, type); + if (ret < 0) + return ret; attach_page_private(page, subpage); return 0; } @@ -39,5 +38,24 @@ void btrfs_detach_subpage(const struct btrfs_fs_info *fs_info, subpage = (struct btrfs_subpage *)detach_page_private(page); ASSERT(subpage); + btrfs_free_subpage(subpage); +} + +int btrfs_alloc_subpage(const struct btrfs_fs_info *fs_info, + struct btrfs_subpage **ret, + enum btrfs_subpage_type type) +{ + if (fs_info->sectorsize == PAGE_SIZE) + return 0; + + *ret = kzalloc(sizeof(struct btrfs_subpage), GFP_NOFS); + if (!*ret) + return -ENOMEM; + spin_lock_init(&(*ret)->lock); + return 0; +} + +void btrfs_free_subpage(struct btrfs_subpage *subpage) +{ kfree(subpage); } |