Change btrfs_map_block to return a structure with mappings for all stripes

[deliverable/linux.git] / fs / btrfs / inode.c

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 17063cd2cb73db467466ccbf27b0561b5366a14a..7ae677d8a6dea67774abd294373e4d9674504825 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -296,6 +296,32 @@ int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
        return 0;
 }
 
+int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
+                        size_t size, struct bio *bio)
+{
+       struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
+       struct btrfs_mapping_tree *map_tree;
+       u64 logical = bio->bi_sector << 9;
+       u64 length = 0;
+       u64 map_length;
+       struct bio_vec *bvec;
+       int i;
+       int ret;
+
+       bio_for_each_segment(bvec, bio, i) {
+               length += bvec->bv_len;
+       }
+       map_tree = &root->fs_info->mapping_tree;
+       map_length = length;
+       ret = btrfs_map_block(map_tree, READ, logical,
+                             &map_length, NULL);
+
+       if (map_length < length + size) {
+               return 1;
+       }
+       return 0;
+}
+
 int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio)
 {
        struct btrfs_root *root = BTRFS_I(inode)->root;
@@ -468,6 +494,7 @@ void btrfs_read_locked_inode(struct inode *inode)
        switch (inode->i_mode & S_IFMT) {
        case S_IFREG:
                inode->i_mapping->a_ops = &btrfs_aops;
+               inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
                BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
                inode->i_fop = &btrfs_file_operations;
                inode->i_op = &btrfs_file_inode_operations;
@@ -482,6 +509,7 @@ void btrfs_read_locked_inode(struct inode *inode)
        case S_IFLNK:
                inode->i_op = &btrfs_symlink_inode_operations;
                inode->i_mapping->a_ops = &btrfs_symlink_aops;
+               inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
                break;
        default:
                init_special_inode(inode, inode->i_mode, rdev);
@@ -1527,6 +1555,7 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
 {
        struct inode *inode;
        struct btrfs_inode_item *inode_item;
+       struct btrfs_block_group_cache *new_inode_group;
        struct btrfs_key *location;
        struct btrfs_path *path;
        struct btrfs_inode_ref *ref;
@@ -1553,9 +1582,13 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
                owner = 0;
        else
                owner = 1;
-       group = btrfs_find_block_group(root, group, 0,
+       new_inode_group = btrfs_find_block_group(root, group, 0,
                                       BTRFS_BLOCK_GROUP_METADATA, owner);
-       BTRFS_I(inode)->block_group = group;
+       if (!new_inode_group) {
+               printk("find_block group failed\n");
+               new_inode_group = group;
+       }
+       BTRFS_I(inode)->block_group = new_inode_group;
        BTRFS_I(inode)->flags = 0;
 
        key[0].objectid = objectid;
@@ -1761,6 +1794,7 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
                drop_inode = 1;
        else {
                inode->i_mapping->a_ops = &btrfs_aops;
+               inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
                inode->i_fop = &btrfs_file_operations;
                inode->i_op = &btrfs_file_inode_operations;
                extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
@@ -2929,6 +2963,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
                drop_inode = 1;
        else {
                inode->i_mapping->a_ops = &btrfs_aops;
+               inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
                inode->i_fop = &btrfs_file_operations;
                inode->i_op = &btrfs_file_inode_operations;
                extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
@@ -2968,6 +3003,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
 
        inode->i_op = &btrfs_symlink_inode_operations;
        inode->i_mapping->a_ops = &btrfs_symlink_aops;
+       inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
        inode->i_size = name_len - 1;
        err = btrfs_update_inode(trans, root, inode);
        if (err)
@@ -3028,6 +3064,7 @@ static struct file_operations btrfs_dir_file_operations = {
 static struct extent_io_ops btrfs_extent_io_ops = {
        .fill_delalloc = run_delalloc_range,
        .submit_bio_hook = btrfs_submit_bio_hook,
+       .merge_bio_hook = btrfs_merge_bio_hook,
        .readpage_io_hook = btrfs_readpage_io_hook,
        .readpage_end_io_hook = btrfs_readpage_end_io_hook,
        .set_bit_hook = btrfs_set_bit_hook,