From patchwork Thu Mar 3 08:35:49 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: liubo X-Patchwork-Id: 605431 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p238YJQT017264 for ; Thu, 3 Mar 2011 08:34:19 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757224Ab1CCIeL (ORCPT ); Thu, 3 Mar 2011 03:34:11 -0500 Received: from cn.fujitsu.com ([222.73.24.84]:53016 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1753982Ab1CCIeK (ORCPT ); Thu, 3 Mar 2011 03:34:10 -0500 Received: from tang.cn.fujitsu.com (tang.cn.fujitsu.com [10.167.250.3]) by song.cn.fujitsu.com (Postfix) with ESMTP id E167A170123; Thu, 3 Mar 2011 16:34:08 +0800 (CST) Received: from mailserver.fnst.cn.fujitus.com (tang.cn.fujitsu.com [127.0.0.1]) by tang.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id p238SISc018984; Thu, 3 Mar 2011 16:28:18 +0800 Received: from localhost.localdomain ([10.167.225.27]) by mailserver.fnst.cn.fujitus.com (Lotus Domino Release 8.5.1FP4) with ESMTP id 2011030316325975-272696 ; Thu, 3 Mar 2011 16:32:59 +0800 Message-ID: <4D6F52E5.9040007@cn.fujitsu.com> Date: Thu, 03 Mar 2011 16:35:49 +0800 From: liubo User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1b3pre) Gecko/20090513 Fedora/3.0-2.3.beta2.fc11 Thunderbird/3.0b2 MIME-Version: 1.0 To: Linux Btrfs CC: linux-fsdevel Subject: [PATCH 2/2] Btrfs: Per file/directory controls for COW and compression X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-03-03 16:32:59, Serialize by Router on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-03-03 16:33:00, Serialize complete at 2011-03-03 16:33:00 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Thu, 03 Mar 2011 08:34:19 +0000 (UTC) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 28188a7..2639107 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1274,6 +1274,7 @@ struct btrfs_root { #define BTRFS_INODE_NODUMP (1 << 8) #define BTRFS_INODE_NOATIME (1 << 9) #define BTRFS_INODE_DIRSYNC (1 << 10) +#define BTRFS_INODE_COMPRESS (1 << 11) /* some macros to generate set/get funcs for the struct fields. This * assumes there is a lefoo_to_cpu for every type, so lets make a simple diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 3e1ea3e..a894c12 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1762,6 +1762,12 @@ struct btrfs_root *open_ctree(struct super_block *sb, btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY); + /* + * In the long term, we'll store the compression type in the super + * block, and it'll be used for per file compression control. + */ + fs_info->compress_type = BTRFS_COMPRESS_ZLIB; + ret = btrfs_parse_options(tree_root, options); if (ret) { err = ret; diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 44b9266..82ca86f 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -381,7 +381,8 @@ again: */ if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) && (btrfs_test_opt(root, COMPRESS) || - (BTRFS_I(inode)->force_compress))) { + (BTRFS_I(inode)->force_compress) || + (BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS))) { WARN_ON(pages); pages = kzalloc(sizeof(struct page *) * nr_pages, GFP_NOFS); @@ -1253,7 +1254,8 @@ static int run_delalloc_range(struct inode *inode, struct page *locked_page, ret = run_delalloc_nocow(inode, locked_page, start, end, page_started, 0, nr_written); else if (!btrfs_test_opt(root, COMPRESS) && - !(BTRFS_I(inode)->force_compress)) + !(BTRFS_I(inode)->force_compress) && + !(BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS)) ret = cow_file_range(inode, locked_page, start, end, page_started, nr_written, 1); else @@ -4581,8 +4583,6 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, location->offset = 0; btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); - btrfs_inherit_iflags(inode, dir); - if ((mode & S_IFREG)) { if (btrfs_test_opt(root, NODATASUM)) BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; @@ -4590,6 +4590,8 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; } + btrfs_inherit_iflags(inode, dir); + insert_inode_hash(inode); inode_tree_add(inode); return inode; @@ -6801,6 +6803,26 @@ static int btrfs_getattr(struct vfsmount *mnt, return 0; } +/* + * If a file is moved, it will inherit the cow and compression flags of the new + * directory. + */ +static void fixup_inode_flags(struct inode *dir, struct inode *inode) +{ + struct btrfs_inode *b_dir = BTRFS_I(dir); + struct btrfs_inode *b_inode = BTRFS_I(inode); + + if (b_dir->flags & BTRFS_INODE_NODATACOW) + b_inode->flags |= BTRFS_INODE_NODATACOW; + else + b_inode->flags &= ~BTRFS_INODE_NODATACOW; + + if (b_dir->flags & BTRFS_INODE_COMPRESS) + b_inode->flags |= BTRFS_INODE_COMPRESS; + else + b_inode->flags &= ~BTRFS_INODE_COMPRESS; +} + static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry) { @@ -6934,6 +6956,8 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry, } } + fixup_inode_flags(new_dir, old_inode); + ret = btrfs_add_link(trans, new_dir, old_inode, new_dentry->d_name.name, new_dentry->d_name.len, 0, index); diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 73138fa..030bc7b 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -138,6 +138,24 @@ static int btrfs_ioctl_getflags(struct file *file, void __user *arg) return 0; } +static int check_flags(unsigned int flags) +{ + if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ + FS_NOATIME_FL | FS_NODUMP_FL | \ + FS_SYNC_FL | FS_DIRSYNC_FL | \ + FS_NOCOMP_FL | FS_COMPR_FL | \ + FS_NOCOW_FL | FS_COW_FL)) + return -EOPNOTSUPP; + + if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) + return -EINVAL; + + if ((flags & FS_NOCOW_FL) && (flags & FS_COW_FL)) + return -EINVAL; + + return 0; +} + static int btrfs_ioctl_setflags(struct file *file, void __user *arg) { struct inode *inode = file->f_path.dentry->d_inode; @@ -153,10 +171,9 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg) if (copy_from_user(&flags, arg, sizeof(flags))) return -EFAULT; - if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ - FS_NOATIME_FL | FS_NODUMP_FL | \ - FS_SYNC_FL | FS_DIRSYNC_FL)) - return -EOPNOTSUPP; + ret = check_flags(flags); + if (ret) + return ret; if (!is_owner_or_cap(inode)) return -EACCES; @@ -201,6 +218,22 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg) else ip->flags &= ~BTRFS_INODE_DIRSYNC; + /* + * The COMPRESS flag can only be changed by users, while the NOCOMPRESS + * flag may be changed automatically if compression code won't make + * things smaller. + */ + if (flags & FS_NOCOMP_FL) { + ip->flags &= ~BTRFS_INODE_COMPRESS; + ip->flags |= BTRFS_INODE_NOCOMPRESS; + } else if (flags & FS_COMPR_FL) { + ip->flags |= BTRFS_INODE_COMPRESS; + ip->flags &= ~BTRFS_INODE_NOCOMPRESS; + } + if (flags & FS_NOCOW_FL) + ip->flags |= BTRFS_INODE_NODATACOW; + else if (flags & FS_COW_FL) + ip->flags &= ~BTRFS_INODE_NODATACOW; trans = btrfs_join_transaction(root, 1); BUG_ON(IS_ERR(trans));