diff options
| -rw-r--r-- | fs/xfs/xfs_file.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index a690af4c105b..cf24b61951e3 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -977,6 +977,146 @@ out_unlock: return error; } +/* + * Flush all file writes out to disk. + */ +static int +xfs_file_wait_for_io( + struct inode *inode, + loff_t offset, + size_t len) +{ + loff_t rounding; + loff_t ioffset; + loff_t iendoffset; + loff_t bs; + int ret; + + bs = inode->i_sb->s_blocksize; + inode_dio_wait(inode); + + rounding = max_t(xfs_off_t, bs, PAGE_SIZE); + ioffset = round_down(offset, rounding); + iendoffset = round_up(offset + len, rounding) - 1; + ret = filemap_write_and_wait_range(inode->i_mapping, ioffset, + iendoffset); + return ret; +} + +/* Hook up to the VFS reflink function */ +STATIC int +xfs_file_share_range( + struct file *file_in, + loff_t pos_in, + struct file *file_out, + loff_t pos_out, + u64 len) +{ + struct inode *inode_in; + struct inode *inode_out; + ssize_t ret; + loff_t bs; + loff_t isize; + int same_inode; + loff_t blen; + + inode_in = file_inode(file_in); + inode_out = file_inode(file_out); + bs = inode_out->i_sb->s_blocksize; + + /* Don't touch certain kinds of inodes */ + if (IS_IMMUTABLE(inode_out)) + return -EPERM; + if (IS_SWAPFILE(inode_in) || + IS_SWAPFILE(inode_out)) + return -ETXTBSY; + + /* Reflink only works within this filesystem. */ + if (inode_in->i_sb != inode_out->i_sb) + return -EXDEV; + same_inode = (inode_in->i_ino == inode_out->i_ino); + + /* Don't reflink dirs, pipes, sockets... */ + if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode)) + return -EISDIR; + if (S_ISFIFO(inode_in->i_mode) || S_ISFIFO(inode_out->i_mode)) + return -EINVAL; + if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode)) + return -EINVAL; + + /* Are we going all the way to the end? */ + isize = i_size_read(inode_in); + if (isize == 0) + return 0; + if (len == 0) + len = isize - pos_in; + + /* Ensure offsets don't wrap and the input is inside i_size */ + if (pos_in + len < pos_in || pos_out + len < pos_out || + pos_in + len > isize) + return -EINVAL; + + /* If we're linking to EOF, continue to the block boundary. */ + if (pos_in + len == isize) + blen = ALIGN(isize, bs) - pos_in; + else + blen = len; + + /* Only reflink if we're aligned to block boundaries */ + if (!IS_ALIGNED(pos_in, bs) || !IS_ALIGNED(pos_in + blen, bs) || + !IS_ALIGNED(pos_out, bs) || !IS_ALIGNED(pos_out + blen, bs)) + return -EINVAL; + + /* Don't allow overlapped reflink within the same file */ + if (same_inode && pos_out + blen > pos_in && pos_out < pos_in + blen) + return -EINVAL; + + /* Wait for the completion of any pending IOs on srcfile */ + ret = xfs_file_wait_for_io(inode_in, pos_in, len); + if (ret) + goto out_unlock; + ret = xfs_file_wait_for_io(inode_out, pos_out, len); + if (ret) + goto out_unlock; + + ret = xfs_reflink_remap_range(XFS_I(inode_in), pos_in, XFS_I(inode_out), + pos_out, len); + if (ret < 0) + goto out_unlock; + +out_unlock: + return ret; +} + +STATIC ssize_t +xfs_file_copy_range( + struct file *file_in, + loff_t pos_in, + struct file *file_out, + loff_t pos_out, + size_t len, + unsigned int flags) +{ + int error; + + error = xfs_file_share_range(file_in, pos_in, file_out, pos_out, + len); + if (error) + return error; + return len; +} + +STATIC int +xfs_file_clone_range( + struct file *file_in, + loff_t pos_in, + struct file *file_out, + loff_t pos_out, + u64 len) +{ + return xfs_file_share_range(file_in, pos_in, file_out, pos_out, + len); +} STATIC int xfs_file_open( @@ -1637,6 +1777,8 @@ const struct file_operations xfs_file_operations = { .release = xfs_file_release, .fsync = xfs_file_fsync, .fallocate = xfs_file_fallocate, + .copy_file_range = xfs_file_copy_range, + .clone_file_range = xfs_file_clone_range, }; const struct file_operations xfs_dir_file_operations = { |