btrfs: introduce EXPORT_FOR_TESTS macro

[sfrench/cifs-2.6.git] / fs / btrfs / ctree.h

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 68f322f600a0677813867c5278b5aca9c23a6e8f..83f0d98c9d5daa9dc9edc2efada9c1007ae2bfce 100644 (file)
--- 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
@@ -3141,7 +3170,7 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
                               struct inode *inode, u64 new_size,
                               u32 min_type);
 
-int btrfs_start_delalloc_inodes(struct btrfs_root *root);
+int btrfs_start_delalloc_snapshot(struct btrfs_root *root);
 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int nr);
 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
                              unsigned int extra_bits,
@@ -3150,6 +3179,14 @@ int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
                             struct btrfs_root *new_root,
                             struct btrfs_root *parent_root,
                             u64 new_dirid);
+ void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state,
+                              unsigned *bits);
+void btrfs_clear_delalloc_extent(struct inode *inode,
+                                struct extent_state *state, unsigned *bits);
+void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new,
+                                struct extent_state *other);
+void btrfs_split_delalloc_extent(struct inode *inode,
+                                struct extent_state *orig, u64 split);
 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
                         size_t size, struct bio *bio,
                         unsigned long bio_flags);
@@ -3189,6 +3226,12 @@ int btrfs_prealloc_file_range_trans(struct inode *inode,
                                    struct btrfs_trans_handle *trans, int mode,
                                    u64 start, u64 num_bytes, u64 min_size,
                                    loff_t actual_len, u64 *alloc_hint);
+int btrfs_run_delalloc_range(void *private_data, struct page *locked_page,
+               u64 start, u64 end, int *page_started, unsigned long *nr_written,
+               struct writeback_control *wbc);
+int btrfs_writepage_cow_fixup(struct page *page, u64 start, u64 end);
+void btrfs_writepage_endio_finish_ordered(struct page *page, u64 start,
+                                         u64 end, int uptodate);
 extern const struct dentry_operations btrfs_dentry_operations;
 
 /* ioctl.c */
@@ -3428,6 +3471,16 @@ static inline void assfail(const char *expr, const char *file, int line)
 #define ASSERT(expr)   ((void)0)
 #endif
 
+/*
+ * Use that for functions that are conditionally exported for sanity tests but
+ * otherwise static
+ */
+#ifndef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
+#define EXPORT_FOR_TESTS static
+#else
+#define EXPORT_FOR_TESTS
+#endif
+
 __cold
 static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
 {