Btrfs: add mount -o auto_defrag

[linux-2.6-block.git] / fs / btrfs / ctree.h

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 026fc47b42cf66ecef5721abb01a8631dd86a311..332323e19dd121d4b2338d5d3371e0df7cc05879 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1074,6 +1074,11 @@ struct btrfs_fs_info {
        /* all metadata allocations go through this cluster */
        struct btrfs_free_cluster meta_alloc_cluster;
 
+       /* auto defrag inodes go here */
+       spinlock_t defrag_inodes_lock;
+       struct rb_root defrag_inodes;
+       atomic_t defrag_running;
+
        spinlock_t ref_cache_lock;
        u64 total_ref_cache_size;
 
@@ -1205,6 +1210,38 @@ struct btrfs_root {
        struct super_block anon_super;
 };
 
+struct btrfs_ioctl_defrag_range_args {
+       /* start of the defrag operation */
+       __u64 start;
+
+       /* number of bytes to defrag, use (u64)-1 to say all */
+       __u64 len;
+
+       /*
+        * flags for the operation, which can include turning
+        * on compression for this one defrag
+        */
+       __u64 flags;
+
+       /*
+        * any extent bigger than this will be considered
+        * already defragged.  Use 0 to take the kernel default
+        * Use 1 to say every single extent must be rewritten
+        */
+       __u32 extent_thresh;
+
+       /*
+        * which compression method to use if turning on compression
+        * for this defrag operation.  If unspecified, zlib will
+        * be used
+        */
+       __u32 compress_type;
+
+       /* spare for later */
+       __u32 unused[4];
+};
+
+
 /*
  * inode items have the data typically returned from stat and store other
  * info about object characteristics.  There is one for every file and dir in
@@ -1302,6 +1339,7 @@ struct btrfs_root {
 #define BTRFS_MOUNT_CLEAR_CACHE                (1 << 13)
 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
 #define BTRFS_MOUNT_ENOSPC_DEBUG        (1 << 15)
+#define BTRFS_MOUNT_AUTO_DEFRAG                (1 << 16)
 
 #define btrfs_clear_opt(o, opt)                ((o) &= ~BTRFS_MOUNT_##opt)
 #define btrfs_set_opt(o, opt)          ((o) |= BTRFS_MOUNT_##opt)
@@ -2528,8 +2566,13 @@ extern const struct dentry_operations btrfs_dentry_operations;
 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 void btrfs_update_iflags(struct inode *inode);
 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
-
+int btrfs_defrag_file(struct inode *inode, struct file *file,
+                     struct btrfs_ioctl_defrag_range_args *range,
+                     u64 newer_than, unsigned long max_pages);
 /* file.c */
+int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
+                          struct inode *inode);
+int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
 int btrfs_sync_file(struct file *file, int datasync);
 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
                            int skip_pinned);