diff options
Diffstat (limited to 'fs/btrfs/ctree.h')
| -rw-r--r-- | fs/btrfs/ctree.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 9025bab58e81..8b41ec42f405 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -712,6 +712,28 @@ struct btrfs_fs_devices; struct btrfs_balance_control; struct btrfs_delayed_root; +/* + * Block group or device which contains an active swapfile. Used for preventing + * unsafe operations while a swapfile is active. + * + * These are sorted on (ptr, inode) (note that a block group or device can + * contain more than one swapfile). We compare the pointer values because we + * don't actually care what the object is, we just need a quick check whether + * the object exists in the rbtree. + */ +struct btrfs_swapfile_pin { + struct rb_node node; + void *ptr; + struct inode *inode; + /* + * If true, ptr points to a struct btrfs_block_group_cache. Otherwise, + * ptr points to a struct btrfs_device. + */ + bool is_block_group; +}; + +bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr); + #define BTRFS_FS_BARRIER 1 #define BTRFS_FS_CLOSING_START 2 #define BTRFS_FS_CLOSING_DONE 3 @@ -1114,6 +1136,10 @@ struct btrfs_fs_info { u32 sectorsize; u32 stripesize; + /* Block groups and devices containing active swapfiles. */ + spinlock_t swapfile_pins_lock; + struct rb_root swapfile_pins; + #ifdef CONFIG_BTRFS_FS_REF_VERIFY spinlock_t ref_verify_lock; struct rb_root block_tree; @@ -1274,6 +1300,9 @@ struct btrfs_root { u64 qgroup_meta_rsv_pertrans; u64 qgroup_meta_rsv_prealloc; + /* Number of active swapfiles */ + atomic_t nr_swapfiles; + #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS u64 alloc_bytenr; #endif |