btrfs-progs: add balance status structures

Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/ctree.h b/ctree.h
index eb6e36b..a591765 100644 (file)
--- a/ctree.h
+++ b/ctree.h
@@ -788,6 +788,84 @@ struct btrfs_root_ref {
        __le16 name_len;
 } __attribute__ ((__packed__));
 
+struct btrfs_disk_balance_args {
+       /*
+        * profiles to operate on, single is denoted by
+        * BTRFS_AVAIL_ALLOC_BIT_SINGLE
+        */
+       __le64 profiles;
+
+       /*
+        * usage filter
+        * BTRFS_BALANCE_ARGS_USAGE with a single value means '0..N'
+        * BTRFS_BALANCE_ARGS_USAGE_RANGE - range syntax, min..max
+        */
+       union {
+               __le64 usage;
+               struct {
+                       __le32 usage_min;
+                       __le32 usage_max;
+               };
+       };
+
+       /* devid filter */
+       __le64 devid;
+
+       /* devid subset filter [pstart..pend) */
+       __le64 pstart;
+       __le64 pend;
+
+       /* btrfs virtual address space subset filter [vstart..vend) */
+       __le64 vstart;
+       __le64 vend;
+
+       /*
+        * profile to convert to, single is denoted by
+        * BTRFS_AVAIL_ALLOC_BIT_SINGLE
+        */
+       __le64 target;
+
+       /* BTRFS_BALANCE_ARGS_* */
+       __le64 flags;
+
+       /*
+        * BTRFS_BALANCE_ARGS_LIMIT with value 'limit'
+        * BTRFS_BALANCE_ARGS_LIMIT_RANGE - the extend version can use minimum
+        * and maximum
+        */
+       union {
+               __le64 limit;
+               struct {
+                       __le32 limit_min;
+                       __le32 limit_max;
+               };
+       };
+
+       /*
+        * Process chunks that cross stripes_min..stripes_max devices,
+        * BTRFS_BALANCE_ARGS_STRIPES_RANGE
+        */
+       __le32 stripes_min;
+       __le32 stripes_max;
+
+       __le64 unused[6];
+} __attribute__ ((__packed__));
+
+/*
+ * store balance parameters to disk so that balance can be properly
+ * resumed after crash or unmount
+ */
+struct btrfs_balance_item {
+       /* BTRFS_BALANCE_* */
+       __le64 flags;
+
+       struct btrfs_disk_balance_args data;
+       struct btrfs_disk_balance_args meta;
+       struct btrfs_disk_balance_args sys;
+
+       __le64 unused[4];
+} __attribute__ ((__packed__));
+
 #define BTRFS_FILE_EXTENT_INLINE 0
 #define BTRFS_FILE_EXTENT_REG 1
 #define BTRFS_FILE_EXTENT_PREALLOC 2
@@ -2225,6 +2303,36 @@ BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_referenced,
 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_limit_rsv_exclusive,
                         struct btrfs_qgroup_limit_item, rsv_exclusive, 64);
 
+/* btrfs_balance_item */
+BTRFS_SETGET_FUNCS(balance_item_flags, struct btrfs_balance_item, flags, 64);
+
+static inline struct btrfs_disk_balance_args* btrfs_balance_item_data(
+               struct extent_buffer *eb, struct btrfs_balance_item *bi)
+{
+       unsigned long offset = (unsigned long)bi;
+       struct btrfs_balance_item *p;
+       p = (struct btrfs_balance_item *)(eb->data + offset);
+       return &p->data;
+}
+
+static inline struct btrfs_disk_balance_args* btrfs_balance_item_meta(
+               struct extent_buffer *eb, struct btrfs_balance_item *bi)
+{
+       unsigned long offset = (unsigned long)bi;
+       struct btrfs_balance_item *p;
+       p = (struct btrfs_balance_item *)(eb->data + offset);
+       return &p->meta;
+}
+
+static inline struct btrfs_disk_balance_args* btrfs_balance_item_sys(
+               struct extent_buffer *eb, struct btrfs_balance_item *bi)
+{
+       unsigned long offset = (unsigned long)bi;
+       struct btrfs_balance_item *p;
+       p = (struct btrfs_balance_item *)(eb->data + offset);
+       return &p->sys;
+}
+
 /*
  * this returns the number of bytes used by the item on disk, minus the
  * size of any extent headers.  If a file is compressed on disk, this is