return ret;
}
-long btrfs_ioctl_clone(struct file *file, unsigned long src_fd)
+long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, u64 off,
+ u64 olen, u64 destoff)
{
struct inode *inode = fdentry(file)->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
u32 nritems;
int slot;
int ret;
+ u64 len = olen;
+ u64 bs = root->fs_info->sb->s_blocksize;
+ u64 hint_byte;
- src_file = fget(src_fd);
+ /*
+ * TODO:
+ * - split compressed inline extents. annoying: we need to
+ * decompress into destination's address_space (the file offset
+ * may change, so source mapping won't do), then recompress (or
+ * otherwise reinsert) a subrange.
+ * - allow ranges within the same file to be cloned (provided
+ * they don't overlap)?
+ */
+
+ src_file = fget(srcfd);
if (!src_file)
return -EBADF;
src = src_file->f_dentry->d_inode;
+ ret = -EINVAL;
+ if (src == inode)
+ goto out_fput;
+
ret = -EISDIR;
if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode))
goto out_fput;
mutex_lock(&inode->i_mutex);
}
- ret = -ENOTEMPTY;
- if (inode->i_size)
+ /* determine range to clone */
+ ret = -EINVAL;
+ if (off >= src->i_size || off + len > src->i_size)
goto out_unlock;
+ if (len == 0)
+ olen = len = src->i_size - off;
+ /* if we extend to eof, continue to block boundary */
+ if (off + len == src->i_size)
+ len = ((src->i_size + bs-1) & ~(bs-1))
+ - off;
+
+ /* verify the end result is block aligned */
+ if ((off & (bs-1)) ||
+ ((off + len) & (bs-1)))
+ goto out_unlock;
+
+ printk("final src extent is %llu~%llu\n", off, len);
+ printk("final dst extent is %llu~%llu\n", destoff, len);
/* do any pending delalloc/csum calc on src, one way or
another, and lock file content */
while (1) {
struct btrfs_ordered_extent *ordered;
- lock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
- ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1);
+ lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
+ ordered = btrfs_lookup_first_ordered_extent(inode, off+len);
if (BTRFS_I(src)->delalloc_bytes == 0 && !ordered)
break;
- unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
+ unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
if (ordered)
btrfs_put_ordered_extent(ordered);
- btrfs_wait_ordered_range(src, 0, (u64)-1);
+ btrfs_wait_ordered_range(src, off, off+len);
}
trans = btrfs_start_transaction(root, 1);
BUG_ON(!trans);
+ /* punch hole in destination first */
+ btrfs_drop_extents(trans, root, inode, off, off+len, 0, &hint_byte);
+
+ /* clone data */
key.objectid = src->i_ino;
key.type = BTRFS_EXTENT_DATA_KEY;
key.offset = 0;
key.objectid != src->i_ino)
break;
- if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY ||
- btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) {
+ if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
+ struct btrfs_file_extent_item *extent;
+ int type;
u32 size;
struct btrfs_key new_key;
+ u64 disko = 0, diskl = 0;
+ u64 datao = 0, datal = 0;
+ u8 comp;
size = btrfs_item_size_nr(leaf, slot);
read_extent_buffer(leaf, buf,
btrfs_item_ptr_offset(leaf, slot),
size);
+
+ extent = btrfs_item_ptr(leaf, slot,
+ struct btrfs_file_extent_item);
+ comp = btrfs_file_extent_compression(leaf, extent);
+ type = btrfs_file_extent_type(leaf, extent);
+ if (type == BTRFS_FILE_EXTENT_REG) {
+ disko = btrfs_file_extent_disk_bytenr(leaf, extent);
+ diskl = btrfs_file_extent_disk_num_bytes(leaf, extent);
+ datao = btrfs_file_extent_offset(leaf, extent);
+ datal = btrfs_file_extent_num_bytes(leaf, extent);
+ } else if (type == BTRFS_FILE_EXTENT_INLINE) {
+ /* take upper bound, may be compressed */
+ datal = btrfs_file_extent_ram_bytes(leaf,
+ extent);
+ }
btrfs_release_path(root, path);
+ if (key.offset + datal < off ||
+ key.offset >= off+len)
+ goto next;
+
memcpy(&new_key, &key, sizeof(new_key));
new_key.objectid = inode->i_ino;
- ret = btrfs_insert_empty_item(trans, root, path,
- &new_key, size);
- if (ret)
- goto out;
+ new_key.offset = key.offset + destoff - off;
- leaf = path->nodes[0];
- slot = path->slots[0];
- write_extent_buffer(leaf, buf,
+ if (type == BTRFS_FILE_EXTENT_REG) {
+ ret = btrfs_insert_empty_item(trans, root, path,
+ &new_key, size);
+ if (ret)
+ goto out;
+
+ leaf = path->nodes[0];
+ slot = path->slots[0];
+ write_extent_buffer(leaf, buf,
btrfs_item_ptr_offset(leaf, slot),
size);
- btrfs_mark_buffer_dirty(leaf);
- }
-
- if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
- struct btrfs_file_extent_item *extent;
- int found_type;
- extent = btrfs_item_ptr(leaf, slot,
+ extent = btrfs_item_ptr(leaf, slot,
struct btrfs_file_extent_item);
- found_type = btrfs_file_extent_type(leaf, extent);
- if (found_type == BTRFS_FILE_EXTENT_REG ||
- found_type == BTRFS_FILE_EXTENT_PREALLOC) {
- u64 ds = btrfs_file_extent_disk_bytenr(leaf,
- extent);
- u64 dl = btrfs_file_extent_disk_num_bytes(leaf,
- extent);
- /* ds == 0 means there's a hole */
- if (ds != 0) {
+ printk(" orig disk %llu~%llu data %llu~%llu\n",
+ disko, diskl, datao, datal);
+
+ if (off > key.offset) {
+ datao += off - key.offset;
+ datal -= off - key.offset;
+ }
+ if (key.offset + datao + datal + key.offset >
+ off + len)
+ datal = off + len - key.offset - datao;
+ /* disko == 0 means it's a hole */
+ if (!disko)
+ datao = 0;
+ printk(" final disk %llu~%llu data %llu~%llu\n",
+ disko, diskl, datao, datal);
+
+ btrfs_set_file_extent_offset(leaf, extent,
+ datao);
+ btrfs_set_file_extent_num_bytes(leaf, extent,
+ datal);
+ if (disko) {
+ inode_add_bytes(inode, datal);
ret = btrfs_inc_extent_ref(trans, root,
- ds, dl, leaf->start,
- root->root_key.objectid,
- trans->transid,
- inode->i_ino);
+ disko, diskl, leaf->start,
+ root->root_key.objectid,
+ trans->transid,
+ inode->i_ino);
BUG_ON(ret);
}
+ } else if (type == BTRFS_FILE_EXTENT_INLINE) {
+ u64 skip = 0;
+ u64 trim = 0;
+ if (off > key.offset) {
+ skip = off - key.offset;
+ new_key.offset += skip;
+ }
+ if (key.offset + datal > off+len)
+ trim = key.offset + datal - (off+len);
+ printk("len %lld skip %lld trim %lld\n",
+ datal, skip, trim);
+ if (comp && (skip || trim)) {
+ printk("btrfs clone_range can't split compressed inline extents yet\n");
+ ret = -EINVAL;
+ goto out;
+ }
+ size -= skip + trim;
+ datal -= skip + trim;
+ ret = btrfs_insert_empty_item(trans, root, path,
+ &new_key, size);
+ if (ret)
+ goto out;
+
+ if (skip) {
+ u32 start = btrfs_file_extent_calc_inline_size(0);
+ memmove(buf+start, buf+start+skip,
+ datal);
+ }
+
+ leaf = path->nodes[0];
+ slot = path->slots[0];
+ write_extent_buffer(leaf, buf,
+ btrfs_item_ptr_offset(leaf, slot),
+ size);
+ inode_add_bytes(inode, datal);
}
+
+ btrfs_mark_buffer_dirty(leaf);
}
+
+ if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) {
+ u32 size;
+ struct btrfs_key new_key;
+ u64 coverslen;
+ int coff, clen;
+
+ size = btrfs_item_size_nr(leaf, slot);
+ coverslen = (size / BTRFS_CRC32_SIZE) <<
+ root->fs_info->sb->s_blocksize_bits;
+ printk("csums for %llu~%llu\n",
+ key.offset, coverslen);
+ if (key.offset + coverslen < off ||
+ key.offset >= off+len)
+ goto next;
+
+ read_extent_buffer(leaf, buf,
+ btrfs_item_ptr_offset(leaf, slot),
+ size);
+ btrfs_release_path(root, path);
+
+ coff = 0;
+ if (off > key.offset)
+ coff = ((off - key.offset) >>
+ root->fs_info->sb->s_blocksize_bits) *
+ BTRFS_CRC32_SIZE;
+ clen = size - coff;
+ if (key.offset + coverslen > off+len)
+ clen -= ((key.offset+coverslen-off-len) >>
+ root->fs_info->sb->s_blocksize_bits) *
+ BTRFS_CRC32_SIZE;
+ printk(" will dup %d~%d of %d\n",
+ coff, clen, size);
+
+ memcpy(&new_key, &key, sizeof(new_key));
+ new_key.objectid = inode->i_ino;
+ new_key.offset = key.offset + destoff - off;
+
+ ret = btrfs_insert_empty_item(trans, root, path,
+ &new_key, clen);
+ if (ret)
+ goto out;
+
+ leaf = path->nodes[0];
+ slot = path->slots[0];
+ write_extent_buffer(leaf, buf + coff,
+ btrfs_item_ptr_offset(leaf, slot),
+ clen);
+ btrfs_mark_buffer_dirty(leaf);
+ }
+
+ next:
btrfs_release_path(root, path);
key.offset++;
}
btrfs_release_path(root, path);
if (ret == 0) {
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
- inode_set_bytes(inode, inode_get_bytes(src));
- btrfs_i_size_write(inode, src->i_size);
+ if (destoff + olen > inode->i_size)
+ btrfs_i_size_write(inode, destoff + olen);
BTRFS_I(inode)->flags = BTRFS_I(src)->flags;
ret = btrfs_update_inode(trans, root, inode);
}
btrfs_end_transaction(trans, root);
- unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
+ unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
if (ret)
vmtruncate(inode, 0);
out_unlock:
return ret;
}
+long btrfs_ioctl_clone_range(struct file *file, unsigned long argptr)
+{
+ struct btrfs_ioctl_clone_range_args args;
+
+ if (copy_from_user(&args, (void *)argptr, sizeof(args)))
+ return -EFAULT;
+ return btrfs_ioctl_clone(file, args.src_fd, args.src_offset,
+ args.src_length, args.dest_offset);
+}
+
/*
* there are many ways the trans_start and trans_end ioctls can lead
* to deadlocks. They should only be used by applications that
case BTRFS_IOC_BALANCE:
return btrfs_balance(root->fs_info->dev_root);
case BTRFS_IOC_CLONE:
- return btrfs_ioctl_clone(file, arg);
+ return btrfs_ioctl_clone(file, arg, 0, 0, 0);
+ case BTRFS_IOC_CLONE_RANGE:
+ return btrfs_ioctl_clone_range(file, arg);
case BTRFS_IOC_TRANS_START:
return btrfs_ioctl_trans_start(file);
case BTRFS_IOC_TRANS_END:
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff