diff options
Diffstat (limited to 'fs/btrfs/super.c')
-rw-r--r-- | fs/btrfs/super.c | 118 |
1 files changed, 63 insertions, 55 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index b2a2220..583cd87 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -150,11 +150,6 @@ static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, BUG_ON(ret); btrfs_release_path(root, path); - ret = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, - objectid, -1); - BUG_ON(ret); - ret = btrfs_del_item(trans, root, path); - BUG_ON(ret); dentry->d_inode->i_ctime = dir->i_ctime; err: btrfs_release_path(root, path); @@ -329,8 +324,9 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, extent_start = btrfs_file_extent_disk_blocknr(fi); extent_num_blocks = btrfs_file_extent_disk_num_blocks(fi); + /* FIXME blocksize != 4096 */ inode->i_blocks -= - btrfs_file_extent_num_blocks(fi) >> 9; + btrfs_file_extent_num_blocks(fi) << 3; found_extent = 1; } else { found_extent = 0; @@ -562,7 +558,7 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) if (btrfs_disk_key_objectid(&item->key) != key.objectid) break; if (btrfs_disk_key_type(&item->key) != key_type) - continue; + break; if (btrfs_disk_key_offset(&item->key) < filp->f_pos) continue; filp->f_pos = btrfs_disk_key_offset(&item->key); @@ -1285,29 +1281,27 @@ static int drop_extents(struct btrfs_trans_handle *trans, struct btrfs_path *path; u64 search_start = start; int bookend; - path = btrfs_alloc_path(); if (!path) return -ENOMEM; -search_again: - ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, - search_start, -1); - if (ret < 0) - goto out; - if (ret > 0) { - if (path->slots[0] == 0) { - ret = -ENOENT; + while(1) { + btrfs_release_path(root, path); + ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, + search_start, -1); + if (ret < 0) goto out; + if (ret > 0) { + if (path->slots[0] == 0) { + ret = -ENOENT; + goto out; + } + path->slots[0]--; } - path->slots[0]--; - } - while(1) { keep = 0; bookend = 0; leaf = btrfs_buffer_leaf(path->nodes[0]); slot = path->slots[0]; btrfs_disk_key_to_cpu(&key, &leaf->items[slot].key); - extent = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); extent_end = key.offset + @@ -1318,7 +1312,10 @@ search_again: goto out; } if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) - goto next_leaf; + goto out; + if (search_start >= extent_end) + goto out; + search_start = extent_end; if (end < extent_end && end >= key.offset) { memcpy(&old, extent, sizeof(old)); @@ -1331,10 +1328,13 @@ search_again: if (start > key.offset) { u64 new_num; + u64 old_num; /* truncate existing extent */ keep = 1; WARN_ON(start & (root->blocksize - 1)); new_num = (start - key.offset) >> inode->i_blkbits; + old_num = btrfs_file_extent_num_blocks(extent); + inode->i_blocks -= (old_num - new_num) << 3; btrfs_set_file_extent_num_blocks(extent, new_num); mark_buffer_dirty(path->nodes[0]); } @@ -1344,13 +1344,11 @@ search_again: disk_blocknr = btrfs_file_extent_disk_blocknr(extent); disk_num_blocks = btrfs_file_extent_disk_num_blocks(extent); - search_start = key.offset + - (btrfs_file_extent_num_blocks(extent) << - inode->i_blkbits); ret = btrfs_del_item(trans, root, path); BUG_ON(ret); + inode->i_blocks -= + btrfs_file_extent_num_blocks(extent) << 3; btrfs_release_path(root, path); - ret = btrfs_free_extent(trans, root, disk_blocknr, disk_num_blocks, 0); @@ -1360,7 +1358,7 @@ search_again: goto out; } if (!bookend) - goto search_again; + continue; } if (bookend) { /* create bookend */ @@ -1395,21 +1393,12 @@ search_again: btrfs_set_file_extent_generation(extent, btrfs_file_extent_generation(&old)); btrfs_mark_buffer_dirty(path->nodes[0]); + inode->i_blocks += + btrfs_file_extent_num_blocks(extent) << 3; ret = 0; goto out; } -next_leaf: - if (slot >= btrfs_header_nritems(&leaf->header) - 1) { - ret = btrfs_next_leaf(root, path); - if (ret) { - ret = 0; - goto out; - } - } else { - path->slots[0]++; - } } - out: btrfs_free_path(path); return ret; @@ -1445,15 +1434,6 @@ static int prepare_pages(struct btrfs_root *root, } offset = pos & (PAGE_CACHE_SIZE -1); this_write = min(PAGE_CACHE_SIZE - offset, write_bytes); -#if 0 - if ((pages[i]->index == first_index || - pages[i]->index == last_index) && pos < isize && - !PageUptodate(pages[i])) { - ret = mpage_readpage(pages[i], btrfs_get_block); - BUG_ON(ret); - lock_page(pages[i]); - } -#endif create_empty_buffers(pages[i], root->fs_info->sb->s_blocksize, (1 << BH_Uptodate)); head = page_buffers(pages[i]); @@ -1494,6 +1474,7 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf, struct inode *inode = file->f_path.dentry->d_inode; struct btrfs_root *root = BTRFS_I(inode)->root; struct page *pages[8]; + struct page *pinned[2] = { NULL, NULL }; unsigned long first_index; unsigned long last_index; u64 start_pos; @@ -1505,14 +1486,6 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf, if (file->f_flags & O_DIRECT) return -EINVAL; pos = *ppos; - - start_pos = pos & ~(root->blocksize - 1); - /* FIXME */ - if (start_pos != pos) - return -EINVAL; - num_blocks = (count + pos - start_pos + root->blocksize - 1) >> - inode->i_blkbits; - vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); current->backing_dev_info = inode->i_mapping->backing_dev_info; err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode)); @@ -1524,10 +1497,37 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf, if (err) goto out; file_update_time(file); + + start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1); + num_blocks = (count + pos - start_pos + root->blocksize - 1) >> + inode->i_blkbits; + mutex_lock(&inode->i_mutex); first_index = pos >> PAGE_CACHE_SHIFT; last_index = (pos + count) >> PAGE_CACHE_SHIFT; + if ((first_index << PAGE_CACHE_SHIFT) < inode->i_size && + (pos & (PAGE_CACHE_SIZE - 1))) { + pinned[0] = grab_cache_page(inode->i_mapping, first_index); + if (!PageUptodate(pinned[0])) { + ret = mpage_readpage(pinned[0], btrfs_get_block); + BUG_ON(ret); + } else { + unlock_page(pinned[0]); + } + } + if (first_index != last_index && + (last_index << PAGE_CACHE_SHIFT) < inode->i_size && + (count & (PAGE_CACHE_SIZE - 1))) { + pinned[1] = grab_cache_page(inode->i_mapping, last_index); + if (!PageUptodate(pinned[1])) { + ret = mpage_readpage(pinned[1], btrfs_get_block); + BUG_ON(ret); + } else { + unlock_page(pinned[1]); + } + } + mutex_lock(&root->fs_info->fs_mutex); trans = btrfs_start_transaction(root, 1); if (!trans) { @@ -1535,11 +1535,14 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf, mutex_unlock(&root->fs_info->fs_mutex); goto out_unlock; } + /* FIXME blocksize != 4096 */ + inode->i_blocks += num_blocks << 3; if (start_pos < inode->i_size) { + /* FIXME blocksize != pagesize */ ret = drop_extents(trans, root, inode, start_pos, (pos + count + root->blocksize -1) & - ~(root->blocksize - 1)); + ~((u64)root->blocksize - 1)); } ret = btrfs_alloc_extent(trans, root, num_blocks, 1, (u64)-1, &ins); @@ -1585,8 +1588,13 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf, out_unlock: mutex_unlock(&inode->i_mutex); out: + if (pinned[0]) + page_cache_release(pinned[0]); + if (pinned[1]) + page_cache_release(pinned[1]); *ppos = pos; current->backing_dev_info = NULL; + mark_inode_dirty(inode); return num_written ? num_written : err; } |