1 files changed, 14 insertions, 163 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 3ee6b2fadf58..64710fa77d01 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -721,25 +721,35 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
             attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
                 struct btrfs_trans_handle *trans;
                 struct btrfs_root *root = BTRFS_I(inode)->root;
+                struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
+
                 u64 mask = root->blocksize - 1;
                 u64 pos = (inode->i_size + mask) & ~mask;
+                u64 block_end = attr->ia_size | mask;
                 u64 hole_size;
+                u64 alloc_hint;
 
                 if (attr->ia_size <= pos)
                         goto out;
 
                 btrfs_truncate_page(inode->i_mapping, inode->i_size);
 
+                lock_extent(em_tree, pos, block_end, GFP_NOFS);
                 hole_size = (attr->ia_size - pos + mask) & ~mask;
-                hole_size >>= inode->i_blkbits;
 
                 mutex_lock(&root->fs_info->fs_mutex);
                 trans = btrfs_start_transaction(root, 1);
                 btrfs_set_trans_block_group(trans, inode);
+                err = btrfs_drop_extents(trans, root, inode,
+                                         pos, pos + hole_size, &alloc_hint);
+
+                hole_size >>= inode->i_blkbits;
+
                 err = btrfs_insert_file_extent(trans, root, inode->i_ino,
                                                pos, 0, 0, hole_size);
                 btrfs_end_transaction(trans, root);
                 mutex_unlock(&root->fs_info->fs_mutex);
+                unlock_extent(em_tree, pos, block_end, GFP_NOFS);
                 if (err)
                         return err;
         }
@@ -1529,13 +1539,13 @@ insert:
         ret = add_extent_mapping(em_tree, em);
         if (ret == -EEXIST) {
                 free_extent_map(em);
+                em = NULL;
                 failed_insert++;
                 if (failed_insert > 5) {
                         printk("failing to insert %Lu %Lu\n", start, end);
                         err = -EIO;
                         goto out;
                 }
-                em = NULL;
                 goto again;
         }
         err = 0;
@@ -1555,167 +1565,6 @@ out:
         return em;
 }
 
-
-/*
- * FIBMAP and others want to pass in a fake buffer head.  They need to
- * use BTRFS_GET_BLOCK_NO_DIRECT to make sure we don't try to memcpy
- * any packed file data into the fake bh
- */
-#define BTRFS_GET_BLOCK_NO_CREATE 0
-#define BTRFS_GET_BLOCK_CREATE 1
-#define BTRFS_GET_BLOCK_NO_DIRECT 2
-
-/*
- * FIXME create==1 doe not work.
- */
-static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
-                                struct buffer_head *result, int create)
-{
-        int ret;
-        int err = 0;
-        u64 blocknr;
-        u64 extent_start = 0;
-        u64 extent_end = 0;
-        u64 objectid = inode->i_ino;
-        u32 found_type;
-        u64 alloc_hint = 0;
-        struct btrfs_path *path;
-        struct btrfs_root *root = BTRFS_I(inode)->root;
-        struct btrfs_file_extent_item *item;
-        struct btrfs_leaf *leaf;
-        struct btrfs_disk_key *found_key;
-        struct btrfs_trans_handle *trans = NULL;
-
-        path = btrfs_alloc_path();
-        BUG_ON(!path);
-        if (create & BTRFS_GET_BLOCK_CREATE) {
-                /*
-                 * danger!, this only works if the page is properly up
-                 * to date somehow
-                 */
-                trans = btrfs_start_transaction(root, 1);
-                if (!trans) {
-                        err = -ENOMEM;
-                        goto out;
-                }
-                ret = btrfs_drop_extents(trans, root, inode,
-                                         iblock << inode->i_blkbits,
-                                         (iblock + 1) << inode->i_blkbits,
-                                         &alloc_hint);
-                BUG_ON(ret);
-        }
-
-        ret = btrfs_lookup_file_extent(NULL, root, path,
-                                       objectid,
-                                       iblock << inode->i_blkbits, 0);
-        if (ret < 0) {
-                err = ret;
-                goto out;
-        }
-
-        if (ret != 0) {
-                if (path->slots[0] == 0) {
-                        btrfs_release_path(root, path);
-                        goto not_found;
-                }
-                path->slots[0]--;
-        }
-
-        item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
-                              struct btrfs_file_extent_item);
-        leaf = btrfs_buffer_leaf(path->nodes[0]);
-        blocknr = btrfs_file_extent_disk_blocknr(item);
-        blocknr += btrfs_file_extent_offset(item);
-
-        /* are we inside the extent that was found? */
-        found_key = &leaf->items[path->slots[0]].key;
-        found_type = btrfs_disk_key_type(found_key);
-        if (btrfs_disk_key_objectid(found_key) != objectid ||
-            found_type != BTRFS_EXTENT_DATA_KEY) {
-                extent_end = 0;
-                extent_start = 0;
-                goto not_found;
-        }
-        found_type = btrfs_file_extent_type(item);
-        extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
-        if (found_type == BTRFS_FILE_EXTENT_REG) {
-                extent_start = extent_start >> inode->i_blkbits;
-                extent_end = extent_start + btrfs_file_extent_num_blocks(item);
-                err = 0;
-                if (btrfs_file_extent_disk_blocknr(item) == 0)
-                        goto out;
-                if (iblock >= extent_start && iblock < extent_end) {
-                        btrfs_map_bh_to_logical(root, result, blocknr +
-                                                iblock - extent_start);
-                        goto out;
-                }
-        } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
-                char *ptr;
-                char *map;
-                u32 size;
-
-                if (create & BTRFS_GET_BLOCK_NO_DIRECT) {
-                        err = -EINVAL;
-                        goto out;
-                }
-                size = btrfs_file_extent_inline_len(leaf->items +
-                                                    path->slots[0]);
-                extent_end = (extent_start + size) >> inode->i_blkbits;
-                extent_start >>= inode->i_blkbits;
-                if (iblock < extent_start || iblock > extent_end) {
-                        goto not_found;
-                }
-                ptr = btrfs_file_extent_inline_start(item);
-                map = kmap(result->b_page);
-                memcpy(map, ptr, size);
-                memset(map + size, 0, PAGE_CACHE_SIZE - size);
-                flush_dcache_page(result->b_page);
-                kunmap(result->b_page);
-                set_buffer_uptodate(result);
-                SetPageChecked(result->b_page);
-                btrfs_map_bh_to_logical(root, result, 0);
-        }
-not_found:
-        if (create & BTRFS_GET_BLOCK_CREATE) {
-                struct btrfs_key ins;
-                ret = btrfs_alloc_extent(trans, root, inode->i_ino,
-                                         1, 0, alloc_hint, (u64)-1,
-                                         &ins, 1);
-                if (ret) {
-                        err = ret;
-                        goto out;
-                }
-                ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
-                                               iblock << inode->i_blkbits,
-                                               ins.objectid, ins.offset,
-                                               ins.offset);
-                if (ret) {
-                        err = ret;
-                        goto out;
-                }
-                btrfs_map_bh_to_logical(root, result, ins.objectid);
-        }
-out:
-        if (trans) {
-                ret = btrfs_end_transaction(trans, root);
-                if (!err)
-                        err = ret;
-        }
-        btrfs_free_path(path);
-        return err;
-}
-
-int btrfs_get_block(struct inode *inode, sector_t iblock,
-                    struct buffer_head *result, int create)
-{
-        int err;
-        struct btrfs_root *root = BTRFS_I(inode)->root;
-        mutex_lock(&root->fs_info->fs_mutex);
-        err = btrfs_get_block_lock(inode, iblock, result, create);
-        mutex_unlock(&root->fs_info->fs_mutex);
-        return err;
-}
-
 static int btrfs_get_block_bmap(struct inode *inode, sector_t iblock,
                            struct buffer_head *result, int create)
 {
@@ -2469,6 +2318,8 @@ static struct address_space_operations btrfs_aops = {
 static struct address_space_operations btrfs_symlink_aops = {
         .readpage       = btrfs_readpage,
         .writepage      = btrfs_writepage,
+        .invalidatepage = btrfs_invalidatepage,
+        .releasepage    = btrfs_releasepage,
 };
 
 static struct inode_operations btrfs_file_inode_operations = {