btrfs: struct reada_control.root -> reada_control.fs_info

The root is never used.  We substitute extent_root in for the
reada_find_extent call, since it's only ever used to obtain the node
size.  This call site will be changed to use fs_info in a later patch.

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

2 files changed, 8 insertions, 7 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 74110c7eebf1..9a3ca798087f 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3652,7 +3652,7 @@ static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
 
 /* reada.c */
 struct reada_control {
-        struct btrfs_root       *root;          /* tree to prefetch */
+        struct btrfs_fs_info    *fs_info;               /* tree to prefetch */
         struct btrfs_key        key_start;
         struct btrfs_key        key_end;        /* exclusive */
         atomic_t                elems;
diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index f0beb63a6d82..540e729975be 100644
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -544,17 +544,18 @@ static void reada_control_release(struct kref *kref)
 static int reada_add_block(struct reada_control *rc, u64 logical,
                            struct btrfs_key *top, u64 generation)
 {
-        struct btrfs_root *root = rc->root;
+        struct btrfs_fs_info *fs_info = rc->fs_info;
         struct reada_extent *re;
         struct reada_extctl *rec;
 
-        re = reada_find_extent(root, logical, top); /* takes one ref */
+        /* takes one ref */
+        re = reada_find_extent(fs_info->tree_root, logical, top);
         if (!re)
                 return -1;
 
         rec = kzalloc(sizeof(*rec), GFP_KERNEL);
         if (!rec) {
-                reada_extent_put(root->fs_info, re);
+                reada_extent_put(fs_info, re);
                 return -ENOMEM;
         }
 
@@ -914,7 +915,7 @@ struct reada_control *btrfs_reada_add(struct btrfs_root *root,
         if (!rc)
                 return ERR_PTR(-ENOMEM);
 
-        rc->root = root;
+        rc->fs_info = root->fs_info;
         rc->key_start = *key_start;
         rc->key_end = *key_end;
         atomic_set(&rc->elems, 0);
@@ -942,7 +943,7 @@ struct reada_control *btrfs_reada_add(struct btrfs_root *root,
 int btrfs_reada_wait(void *handle)
 {
         struct reada_control *rc = handle;
-        struct btrfs_fs_info *fs_info = rc->root->fs_info;
+        struct btrfs_fs_info *fs_info = rc->fs_info;
 
         while (atomic_read(&rc->elems)) {
                 if (!atomic_read(&fs_info->reada_works_cnt))
@@ -963,7 +964,7 @@ int btrfs_reada_wait(void *handle)
 int btrfs_reada_wait(void *handle)
 {
         struct reada_control *rc = handle;
-        struct btrfs_fs_info *fs_info = rc->root->fs_info;
+        struct btrfs_fs_info *fs_info = rc->fs_info;
 
         while (atomic_read(&rc->elems)) {
                 if (!atomic_read(&fs_info->reada_works_cnt))