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Btrfs: Update clone file ioctl
This patch updates the file clone ioctl for the tree locking and new data ordered code. --- Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan Zheng
Chris Mason
parent
b48652c101
commit
ae01a0abf3
152
fs/btrfs/ioctl.c
152
fs/btrfs/ioctl.c
@ -517,32 +517,6 @@ out:
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return ret;
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}
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int dup_item_to_inode(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path,
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struct extent_buffer *leaf,
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int slot,
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struct btrfs_key *key,
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u64 destino)
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{
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char *dup;
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int len = btrfs_item_size_nr(leaf, slot);
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struct btrfs_key ckey = *key;
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int ret = 0;
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dup = kmalloc(len, GFP_NOFS);
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if (!dup)
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return -ENOMEM;
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read_extent_buffer(leaf, dup, btrfs_item_ptr_offset(leaf, slot), len);
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btrfs_release_path(root, path);
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ckey.objectid = destino;
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ret = btrfs_insert_item(trans, root, &ckey, dup, len);
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kfree(dup);
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return ret;
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}
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long btrfs_ioctl_clone(struct file *file, unsigned long src_fd)
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{
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struct inode *inode = fdentry(file)->d_inode;
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@ -550,23 +524,42 @@ long btrfs_ioctl_clone(struct file *file, unsigned long src_fd)
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struct file *src_file;
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struct inode *src;
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struct btrfs_trans_handle *trans;
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int ret;
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u64 pos;
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struct btrfs_ordered_extent *ordered;
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struct btrfs_path *path;
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struct btrfs_key key;
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struct extent_buffer *leaf;
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char *buf;
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struct btrfs_key key;
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struct btrfs_key new_key;
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u32 size;
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u32 nritems;
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int slot;
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int ret;
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src_file = fget(src_fd);
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if (!src_file)
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return -EBADF;
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src = src_file->f_dentry->d_inode;
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ret = -EXDEV;
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if (src->i_sb != inode->i_sb)
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ret = -EISDIR;
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if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
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goto out_fput;
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ret = -EXDEV;
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if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root)
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goto out_fput;
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ret = -ENOMEM;
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buf = vmalloc(btrfs_level_size(root, 0));
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if (!buf)
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goto out_fput;
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path = btrfs_alloc_path();
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if (!path) {
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vfree(buf);
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goto out_fput;
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}
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path->reada = 2;
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if (inode < src) {
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mutex_lock(&inode->i_mutex);
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mutex_lock(&src->i_mutex);
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@ -582,24 +575,22 @@ long btrfs_ioctl_clone(struct file *file, unsigned long src_fd)
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/* do any pending delalloc/csum calc on src, one way or
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another, and lock file content */
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while (1) {
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filemap_write_and_wait(src->i_mapping);
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lock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
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if (BTRFS_I(src)->delalloc_bytes == 0)
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ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1);
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if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered)
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break;
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unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
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if (ordered)
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btrfs_put_ordered_extent(ordered);
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btrfs_wait_ordered_range(src, 0, (u64)-1);
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}
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trans = btrfs_start_transaction(root, 0);
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path = btrfs_alloc_path();
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if (!path) {
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ret = -ENOMEM;
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goto out;
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}
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key.offset = 0;
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key.type = BTRFS_EXTENT_DATA_KEY;
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trans = btrfs_start_transaction(root, 1);
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BUG_ON(!trans);
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key.objectid = src->i_ino;
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pos = 0;
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path->reada = 2;
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key.type = BTRFS_EXTENT_DATA_KEY;
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key.offset = 0;
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while (1) {
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/*
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@ -610,18 +601,19 @@ long btrfs_ioctl_clone(struct file *file, unsigned long src_fd)
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if (ret < 0)
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goto out;
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if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
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nritems = btrfs_header_nritems(path->nodes[0]);
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if (path->slots[0] >= nritems) {
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ret = btrfs_next_leaf(root, path);
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if (ret < 0)
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goto out;
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if (ret > 0)
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break;
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nritems = btrfs_header_nritems(path->nodes[0]);
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}
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leaf = path->nodes[0];
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slot = path->slots[0];
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btrfs_item_key_to_cpu(leaf, &key, slot);
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nritems = btrfs_header_nritems(leaf);
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btrfs_item_key_to_cpu(leaf, &key, slot);
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if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY ||
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key.objectid != src->i_ino)
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break;
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@ -629,66 +621,64 @@ long btrfs_ioctl_clone(struct file *file, unsigned long src_fd)
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if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
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struct btrfs_file_extent_item *extent;
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int found_type;
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pos = key.offset;
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extent = btrfs_item_ptr(leaf, slot,
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struct btrfs_file_extent_item);
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found_type = btrfs_file_extent_type(leaf, extent);
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if (found_type == BTRFS_FILE_EXTENT_REG) {
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u64 len = btrfs_file_extent_num_bytes(leaf,
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extent);
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u64 ds = btrfs_file_extent_disk_bytenr(leaf,
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extent);
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u64 dl = btrfs_file_extent_disk_num_bytes(leaf,
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extent);
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u64 off = btrfs_file_extent_offset(leaf,
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extent);
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btrfs_insert_file_extent(trans, root,
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inode->i_ino, pos,
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ds, dl, len, off);
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/* ds == 0 means there's a hole */
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if (ds != 0) {
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btrfs_inc_extent_ref(trans, root,
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ret = btrfs_inc_extent_ref(trans, root,
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ds, dl,
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root->root_key.objectid,
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trans->transid,
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inode->i_ino, pos);
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inode->i_ino, key.offset);
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if (ret)
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goto out;
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}
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pos = key.offset + len;
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} else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
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ret = dup_item_to_inode(trans, root, path,
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leaf, slot, &key,
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inode->i_ino);
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if (ret)
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goto out;
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pos = key.offset + btrfs_item_size_nr(leaf,
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slot);
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}
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} else if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) {
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ret = dup_item_to_inode(trans, root, path, leaf,
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slot, &key, inode->i_ino);
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}
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if (ret)
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goto out;
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if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY ||
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btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) {
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size = btrfs_item_size_nr(leaf, slot);
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read_extent_buffer(leaf, buf,
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btrfs_item_ptr_offset(leaf, slot),
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size);
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btrfs_release_path(root, path);
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memcpy(&new_key, &key, sizeof(new_key));
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new_key.objectid = inode->i_ino;
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ret = btrfs_insert_item(trans, root, &new_key,
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buf, size);
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BUG_ON(ret);
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} else {
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btrfs_release_path(root, path);
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}
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key.offset++;
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btrfs_release_path(root, path);
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}
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ret = 0;
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out:
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btrfs_free_path(path);
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inode->i_blocks = src->i_blocks;
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i_size_write(inode, src->i_size);
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btrfs_update_inode(trans, root, inode);
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unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
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btrfs_release_path(root, path);
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if (ret == 0) {
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inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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inode->i_blocks = src->i_blocks;
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btrfs_i_size_write(inode, src->i_size);
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BTRFS_I(inode)->flags = BTRFS_I(src)->flags;
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ret = btrfs_update_inode(trans, root, inode);
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}
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btrfs_end_transaction(trans, root);
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unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
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if (ret)
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vmtruncate(inode, 0);
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out_unlock:
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mutex_unlock(&src->i_mutex);
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mutex_unlock(&inode->i_mutex);
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vfree(buf);
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btrfs_free_path(path);
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out_fput:
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fput(src_file);
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return ret;
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