btrfs: remove cache only arguments from defrag path

The entry point at the defrag ioctl always sets "cache only" to 0;
the codepaths haven't run for a long time as far as I can
tell.  Chris says they're dead code, so remove them.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

7 files changed, 32 insertions, 82 deletions

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 35444013f0cf..ecd25a1b4e51 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1442,7 +1442,7 @@ int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2)
  */
 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
                        struct btrfs_root *root, struct extent_buffer *parent,
-                       int start_slot, int cache_only, u64 *last_ret,
+                       int start_slot, u64 *last_ret,
                        struct btrfs_key *progress)
 {
         struct extent_buffer *cur;
@@ -1462,8 +1462,6 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans,
         struct btrfs_disk_key disk_key;
 
         parent_level = btrfs_header_level(parent);
-        if (cache_only && parent_level != 1)
-                return 0;
 
         WARN_ON(trans->transaction != root->fs_info->running_transaction);
         WARN_ON(trans->transid != root->fs_info->generation);
@@ -1509,10 +1507,6 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans,
                 else
                         uptodate = 0;
                 if (!cur || !uptodate) {
-                        if (cache_only) {
-                                free_extent_buffer(cur);
-                                continue;
-                        }
                         if (!cur) {
                                 cur = read_tree_block(root, blocknr,
                                                          blocksize, gen);
@@ -4826,8 +4820,8 @@ int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path)
 
 /*
  * A helper function to walk down the tree starting at min_key, and looking
- * for nodes or leaves that are either in cache or have a minimum
- * transaction id.  This is used by the btree defrag code, and tree logging
+ * for nodes or leaves that are have a minimum transaction id.
+ * This is used by the btree defrag code, and tree logging
  *
  * This does not cow, but it does stuff the starting key it finds back
  * into min_key, so you can call btrfs_search_slot with cow=1 on the
@@ -4848,7 +4842,7 @@ int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path)
  */
 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
                          struct btrfs_key *max_key,
-                         struct btrfs_path *path, int cache_only,
+                         struct btrfs_path *path,
                          u64 min_trans)
 {
         struct extent_buffer *cur;
@@ -4888,15 +4882,12 @@ again:
                 if (sret && slot > 0)
                         slot--;
                 /*
-                 * check this node pointer against the cache_only and
-                 * min_trans parameters.  If it isn't in cache or is too
-                 * old, skip to the next one.
+                 * check this node pointer against the min_trans parameters.
+                 * If it is too old, old, skip to the next one.
                  */
                 while (slot < nritems) {
                         u64 blockptr;
                         u64 gen;
-                        struct extent_buffer *tmp;
-                        struct btrfs_disk_key disk_key;
 
                         blockptr = btrfs_node_blockptr(cur, slot);
                         gen = btrfs_node_ptr_generation(cur, slot);
@@ -4904,27 +4895,7 @@ again:
                                 slot++;
                                 continue;
                         }
-                        if (!cache_only)
-                                break;
-
-                        if (max_key) {
-                                btrfs_node_key(cur, &disk_key, slot);
-                                if (comp_keys(&disk_key, max_key) >= 0) {
-                                        ret = 1;
-                                        goto out;
-                                }
-                        }
-
-                        tmp = btrfs_find_tree_block(root, blockptr,
-                                            btrfs_level_size(root, level - 1));
-
-                        if (tmp && btrfs_buffer_uptodate(tmp, gen, 1) > 0) {
-                                free_extent_buffer(tmp);
-                                break;
-                        }
-                        if (tmp)
-                                free_extent_buffer(tmp);
-                        slot++;
+                        break;
                 }
 find_next_key:
                 /*
@@ -4935,7 +4906,7 @@ find_next_key:
                         path->slots[level] = slot;
                         btrfs_set_path_blocking(path);
                         sret = btrfs_find_next_key(root, path, min_key, level,
-                                                  cache_only, min_trans);
+                                                  min_trans);
                         if (sret == 0) {
                                 btrfs_release_path(path);
                                 goto again;
@@ -5400,8 +5371,7 @@ out:
 /*
  * this is similar to btrfs_next_leaf, but does not try to preserve
  * and fixup the path.  It looks for and returns the next key in the
- * tree based on the current path and the cache_only and min_trans
- * parameters.
+ * tree based on the current path and the min_trans parameters.
  *
  * 0 is returned if another key is found, < 0 if there are any errors
  * and 1 is returned if there are no higher keys in the tree
@@ -5410,8 +5380,7 @@ out:
  * calling this function.
  */
 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
-                        struct btrfs_key *key, int level,
-                        int cache_only, u64 min_trans)
+                        struct btrfs_key *key, int level, u64 min_trans)
 {
         int slot;
         struct extent_buffer *c;
@@ -5462,22 +5431,8 @@ next:
                 if (level == 0)
                         btrfs_item_key_to_cpu(c, key, slot);
                 else {
-                        u64 blockptr = btrfs_node_blockptr(c, slot);
                         u64 gen = btrfs_node_ptr_generation(c, slot);
 
-                        if (cache_only) {
-                                struct extent_buffer *cur;
-                                cur = btrfs_find_tree_block(root, blockptr,
-                                            btrfs_level_size(root, level - 1));
-                                if (!cur ||
-                                    btrfs_buffer_uptodate(cur, gen, 1) <= 0) {
-                                        slot++;
-                                        if (cur)
-                                                free_extent_buffer(cur);
-                                        goto next;
-                                }
-                                free_extent_buffer(cur);
-                        }
                         if (gen < min_trans) {
                                 slot++;
                                 goto next;
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 1e3a994e1899..7e2cffd2a5d8 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3125,10 +3125,10 @@ struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
                         struct btrfs_key *key, int lowest_level,
-                        int cache_only, u64 min_trans);
+                        u64 min_trans);
 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
                          struct btrfs_key *max_key,
-                         struct btrfs_path *path, int cache_only,
+                         struct btrfs_path *path,
                          u64 min_trans);
 enum btrfs_compare_tree_result {
         BTRFS_COMPARE_TREE_NEW,
@@ -3181,7 +3181,7 @@ int btrfs_search_slot_for_read(struct btrfs_root *root,
                                int find_higher, int return_any);
 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
                        struct btrfs_root *root, struct extent_buffer *parent,
-                       int start_slot, int cache_only, u64 *last_ret,
+                       int start_slot, u64 *last_ret,
                        struct btrfs_key *progress);
 void btrfs_release_path(struct btrfs_path *p);
 struct btrfs_path *btrfs_alloc_path(void);
@@ -3576,7 +3576,7 @@ int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode,
 
 /* tree-defrag.c */
 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
-                        struct btrfs_root *root, int cache_only);
+                        struct btrfs_root *root);
 
 /* sysfs.c */
 int btrfs_init_sysfs(void);
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 96ecefc1724f..daea831f3d36 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -818,7 +818,7 @@ static int find_new_extents(struct btrfs_root *root,
 
         while(1) {
                 ret = btrfs_search_forward(root, &min_key, &max_key,
-                                           path, 0, newer_than);
+                                           path, newer_than);
                 if (ret != 0)
                         goto none;
                 if (min_key.objectid != ino)
@@ -1864,7 +1864,7 @@ static noinline int search_ioctl(struct inode *inode,
         path->keep_locks = 1;
 
         while(1) {
-                ret = btrfs_search_forward(root, &key, &max_key, path, 0,
+                ret = btrfs_search_forward(root, &key, &max_key, path,
                                            sk->min_transid);
                 if (ret != 0) {
                         if (ret > 0)
@@ -2212,10 +2212,10 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp)
                         ret = -EPERM;
                         goto out;
                 }
-                ret = btrfs_defrag_root(root, 0);
+                ret = btrfs_defrag_root(root);
                 if (ret)
                         goto out;
-                ret = btrfs_defrag_root(root->fs_info->extent_root, 0);
+                ret = btrfs_defrag_root(root->fs_info->extent_root);
                 break;
         case S_IFREG:
                 if (!(file->f_mode & FMODE_WRITE)) {
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 5144ad19ef47..60481a53e004 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -959,10 +959,10 @@ static noinline int commit_fs_roots(struct btrfs_trans_handle *trans,
 }
 
 /*
- * defrag a given btree.  If cacheonly == 1, this won't read from the disk,
- * otherwise every leaf in the btree is read and defragged.
+ * defrag a given btree.
+ * Every leaf in the btree is read and defragged.
  */
-int btrfs_defrag_root(struct btrfs_root *root, int cacheonly)
+int btrfs_defrag_root(struct btrfs_root *root)
 {
         struct btrfs_fs_info *info = root->fs_info;
         struct btrfs_trans_handle *trans;
@@ -976,7 +976,7 @@ int btrfs_defrag_root(struct btrfs_root *root, int cacheonly)
                 if (IS_ERR(trans))
                         return PTR_ERR(trans);
 
-                ret = btrfs_defrag_leaves(trans, root, cacheonly);
+                ret = btrfs_defrag_leaves(trans, root);
 
                 btrfs_end_transaction(trans, root);
                 btrfs_btree_balance_dirty(info->tree_root);
diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h
index 69700f7b20ac..46628210e5d8 100644
--- a/fs/btrfs/transaction.h
+++ b/fs/btrfs/transaction.h
@@ -117,7 +117,7 @@ int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
                                      struct btrfs_root *root);
 
 int btrfs_add_dead_root(struct btrfs_root *root);
-int btrfs_defrag_root(struct btrfs_root *root, int cacheonly);
+int btrfs_defrag_root(struct btrfs_root *root);
 int btrfs_clean_old_snapshots(struct btrfs_root *root);
 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
                              struct btrfs_root *root);
diff --git a/fs/btrfs/tree-defrag.c b/fs/btrfs/tree-defrag.c
index 3b580ee8ab1d..94e05c1f118a 100644
--- a/fs/btrfs/tree-defrag.c
+++ b/fs/btrfs/tree-defrag.c
@@ -23,13 +23,14 @@
 #include "transaction.h"
 #include "locking.h"
 
-/* defrag all the leaves in a given btree.  If cache_only == 1, don't read
- * things from disk, otherwise read all the leaves and try to get key order to
+/*
+ * Defrag all the leaves in a given btree.
+ * Read all the leaves and try to get key order to
  * better reflect disk order
  */
 
 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
-                        struct btrfs_root *root, int cache_only)
+                        struct btrfs_root *root)
 {
         struct btrfs_path *path = NULL;
         struct btrfs_key key;
@@ -41,9 +42,6 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
         u64 last_ret = 0;
         u64 min_trans = 0;
 
-        if (cache_only)
-                goto out;
-
         if (root->fs_info->extent_root == root) {
                 /*
                  * there's recursion here right now in the tree locking,
@@ -86,11 +84,8 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
         }
 
         path->keep_locks = 1;
-        if (cache_only)
-                min_trans = root->defrag_trans_start;
 
-        ret = btrfs_search_forward(root, &key, NULL, path,
-                                   cache_only, min_trans);
+        ret = btrfs_search_forward(root, &key, NULL, path, min_trans);
         if (ret < 0)
                 goto out;
         if (ret > 0) {
@@ -109,11 +104,11 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
                 goto out;
         }
         path->slots[1] = btrfs_header_nritems(path->nodes[1]);
-        next_key_ret = btrfs_find_next_key(root, path, &key, 1, cache_only,
+        next_key_ret = btrfs_find_next_key(root, path, &key, 1,
                                            min_trans);
         ret = btrfs_realloc_node(trans, root,
                                  path->nodes[1], 0,
-                                 cache_only, &last_ret,
+                                 &last_ret,
                                  &root->defrag_progress);
         if (ret) {
                 WARN_ON(ret == -EAGAIN);
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index deb7f66356bd..1a79087c4575 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -2738,7 +2738,7 @@ static noinline int log_dir_items(struct btrfs_trans_handle *trans,
         path->keep_locks = 1;
 
         ret = btrfs_search_forward(root, &min_key, &max_key,
-                                   path, 0, trans->transid);
+                                   path, trans->transid);
 
         /*
          * we didn't find anything from this transaction, see if there
@@ -3680,7 +3680,7 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans,
         while (1) {
                 ins_nr = 0;
                 ret = btrfs_search_forward(root, &min_key, &max_key,
-                                           path, 0, trans->transid);
+                                           path, trans->transid);
                 if (ret != 0)
                         break;
 again: