Btrfs: Reduce stack usage in the resizer, fix 32 bit compiles

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index d6e5c19..9873975 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -386,6 +386,7 @@ struct btrfs_root {
        int defrag_running;
        int defrag_level;
        char *name;
+       int in_sysfs;
 };
 
 /*

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index de026d9..67d9fd7 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -374,6 +374,7 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
        root->highest_inode = 0;
        root->last_inode_alloc = 0;
        root->name = NULL;
+       root->in_sysfs = 0;
        memset(&root->root_key, 0, sizeof(root->root_key));
        memset(&root->root_item, 0, sizeof(root->root_item));
        memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
@@ -516,6 +517,9 @@ struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
        if (!root)
                return NULL;
 
+       if (root->in_sysfs)
+               return root;
+
        ret = btrfs_set_root_name(root, name, namelen);
        if (ret) {
                free_extent_buffer(root->node);
@@ -530,6 +534,7 @@ struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
                kfree(root);
                return ERR_PTR(ret);
        }
+       root->in_sysfs = 1;
        return root;
 }
 #if 0

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 91c2b27..6137f06 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -751,7 +751,7 @@ again:
 
                if (found_objectid != root_objectid) {
                        total_count = 2;
-                       break;
+                       goto out;
                }
                total_count = 1;
                path->slots[0]++;
@@ -760,8 +760,6 @@ again:
                total_count = 0;
                goto out;
        }
-       if (total_count > 1)
-               goto out;
        if (level >= 0 && root->node == count_path->nodes[level])
                goto out;
        level++;
@@ -2109,22 +2107,23 @@ static int relocate_inode_pages(struct inode *inode, u64 start, u64 len)
        u64 delalloc_start;
        u64 existing_delalloc;
        unsigned long last_index;
-       unsigned long first_index;
        unsigned long i;
        struct page *page;
        struct btrfs_root *root = BTRFS_I(inode)->root;
        struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
-       struct file_ra_state ra;
+       struct file_ra_state *ra;
+
+       ra = kzalloc(sizeof(*ra), GFP_NOFS);
 
        mutex_lock(&inode->i_mutex);
-       first_index = start >> PAGE_CACHE_SHIFT;
+       i = start >> PAGE_CACHE_SHIFT;
        last_index = (start + len - 1) >> PAGE_CACHE_SHIFT;
 
-       memset(&ra, 0, sizeof(ra));
-       file_ra_state_init(&ra, inode->i_mapping);
-       btrfs_force_ra(inode->i_mapping, &ra, NULL, first_index, last_index);
+       file_ra_state_init(ra, inode->i_mapping);
+       btrfs_force_ra(inode->i_mapping, ra, NULL, i, last_index);
+       kfree(ra);
 
-       for (i = first_index; i <= last_index; i++) {
+       for (; i <= last_index; i++) {
                page = grab_cache_page(inode->i_mapping, i);
                if (!page)
                        goto out_unlock;
@@ -2167,27 +2166,43 @@ out_unlock:
        return 0;
 }
 
+/*
+ * note, this releases the path
+ */
 static int relocate_one_reference(struct btrfs_root *extent_root,
                                  struct btrfs_path *path,
-                                 struct btrfs_key *extent_key,
-                                 u64 ref_root, u64 ref_gen, u64 ref_objectid,
-                                 u64 ref_offset)
+                                 struct btrfs_key *extent_key)
 {
        struct inode *inode;
        struct btrfs_root *found_root;
-       struct btrfs_key root_location;
+       struct btrfs_key *root_location;
+       struct btrfs_extent_ref *ref;
+       u64 ref_root;
+       u64 ref_gen;
+       u64 ref_objectid;
+       u64 ref_offset;
        int ret;
 
-       root_location.objectid = ref_root;
+       ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
+                            struct btrfs_extent_ref);
+       ref_root = btrfs_ref_root(path->nodes[0], ref);
+       ref_gen = btrfs_ref_generation(path->nodes[0], ref);
+       ref_objectid = btrfs_ref_objectid(path->nodes[0], ref);
+       ref_offset = btrfs_ref_offset(path->nodes[0], ref);
+       btrfs_release_path(extent_root, path);
+
+       root_location = kmalloc(sizeof(*root_location), GFP_NOFS);
+       root_location->objectid = ref_root;
        if (ref_gen == 0)
-               root_location.offset = 0;
+               root_location->offset = 0;
        else
-               root_location.offset = (u64)-1;
-       root_location.type = BTRFS_ROOT_ITEM_KEY;
+               root_location->offset = (u64)-1;
+       root_location->type = BTRFS_ROOT_ITEM_KEY;
 
        found_root = btrfs_read_fs_root_no_name(extent_root->fs_info,
-                                               &root_location);
+                                               root_location);
        BUG_ON(!found_root);
+       kfree(root_location);
 
        if (ref_objectid >= BTRFS_FIRST_FREE_OBJECTID) {
                mutex_unlock(&extent_root->fs_info->fs_mutex);
@@ -2259,12 +2274,7 @@ static int relocate_one_extent(struct btrfs_root *extent_root,
 {
        struct btrfs_key key;
        struct btrfs_key found_key;
-       struct btrfs_extent_ref *ref;
        struct extent_buffer *leaf;
-       u64 ref_root;
-       u64 ref_gen;
-       u64 ref_objectid;
-       u64 ref_offset;
        u32 nritems;
        u32 item_size;
        int ret = 0;
@@ -2297,17 +2307,7 @@ static int relocate_one_extent(struct btrfs_root *extent_root,
                key.offset = found_key.offset + 1;
                item_size = btrfs_item_size_nr(leaf, path->slots[0]);
 
-               ref = btrfs_item_ptr(leaf, path->slots[0],
-                                    struct btrfs_extent_ref);
-               ref_root = btrfs_ref_root(leaf, ref);
-               ref_gen = btrfs_ref_generation(leaf, ref);
-               ref_objectid = btrfs_ref_objectid(leaf, ref);
-               ref_offset = btrfs_ref_offset(leaf, ref);
-               btrfs_release_path(extent_root, path);
-
-               ret = relocate_one_reference(extent_root, path,
-                                            extent_key, ref_root, ref_gen,
-                                            ref_objectid, ref_offset);
+               ret = relocate_one_reference(extent_root, path, extent_key);
                if (ret)
                        goto out;
        }
@@ -2354,7 +2354,6 @@ int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size)
        struct btrfs_path *path;
        u64 cur_byte;
        u64 total_found;
-       u64 ptr;
        struct btrfs_fs_info *info = root->fs_info;
        struct extent_map_tree *block_group_cache;
        struct btrfs_key key;
@@ -2377,6 +2376,7 @@ again:
        key.offset = 0;
        key.type = 0;
        while(1) {
+
                ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
                if (ret < 0)
                        goto out;
@@ -2441,6 +2441,8 @@ next:
        key.offset = 0;
        key.type = 0;
        while(1) {
+               u64 ptr;
+
                ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
                if (ret < 0)
                        goto out;

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 5003a86..b62f35e 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2108,7 +2108,8 @@ static void btrfs_truncate(struct inode *inode)
        btrfs_btree_balance_dirty(root, nr);
 }
 
-static int create_subvol(struct btrfs_root *root, char *name, int namelen)
+static int noinline create_subvol(struct btrfs_root *root, char *name,
+                                 int namelen)
 {
        struct btrfs_trans_handle *trans;
        struct btrfs_key key;
@@ -2492,7 +2493,8 @@ out:
        return ret;
 }
 
-static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg)
+static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
+                                           void __user *arg)
 {
        struct btrfs_ioctl_vol_args *vol_args;
        struct btrfs_dir_item *di;

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 1ad611b..02721ee 100644 (file)
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -481,12 +481,10 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
        struct btrfs_transaction *cur_trans;
        struct btrfs_transaction *prev_trans = NULL;
        struct list_head dirty_fs_roots;
-       struct extent_map_tree pinned_copy;
+       struct extent_map_tree *pinned_copy;
        DEFINE_WAIT(wait);
        int ret;
 
-       extent_map_tree_init(&pinned_copy,
-                            root->fs_info->btree_inode->i_mapping, GFP_NOFS);
        INIT_LIST_HEAD(&dirty_fs_roots);
 
        mutex_lock(&root->fs_info->trans_mutex);
@@ -507,6 +505,14 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
                mutex_lock(&root->fs_info->fs_mutex);
                return 0;
        }
+
+       pinned_copy = kmalloc(sizeof(*pinned_copy), GFP_NOFS);
+       if (!pinned_copy)
+               return -ENOMEM;
+
+       extent_map_tree_init(pinned_copy,
+                            root->fs_info->btree_inode->i_mapping, GFP_NOFS);
+
        trans->transaction->in_commit = 1;
        cur_trans = trans->transaction;
        if (cur_trans->list.prev != &root->fs_info->trans_list) {
@@ -568,16 +574,20 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
                            &root->fs_info->super_copy, 0,
                            sizeof(root->fs_info->super_copy));
 
-       btrfs_copy_pinned(root, &pinned_copy);
+       btrfs_copy_pinned(root, pinned_copy);
 
        mutex_unlock(&root->fs_info->trans_mutex);
        mutex_unlock(&root->fs_info->fs_mutex);
        ret = btrfs_write_and_wait_transaction(trans, root);
        BUG_ON(ret);
        write_ctree_super(trans, root);
+
        mutex_lock(&root->fs_info->fs_mutex);
-       btrfs_finish_extent_commit(trans, root, &pinned_copy);
+       btrfs_finish_extent_commit(trans, root, pinned_copy);
        mutex_lock(&root->fs_info->trans_mutex);
+
+       kfree(pinned_copy);
+
        cur_trans->commit_done = 1;
        root->fs_info->last_trans_committed = cur_trans->transid;
        wake_up(&cur_trans->commit_wait);