From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3B1CAC433DF for ; Tue, 9 Jun 2020 06:01:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0738C20812 for ; Tue, 9 Jun 2020 06:01:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="UyT/VVi1" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727825AbgFIGBt (ORCPT ); Tue, 9 Jun 2020 02:01:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44860 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726886AbgFIGBq (ORCPT ); Tue, 9 Jun 2020 02:01:46 -0400 Received: from mail-pl1-x644.google.com (mail-pl1-x644.google.com [IPv6:2607:f8b0:4864:20::644]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EE9CEC03E969 for ; Mon, 8 Jun 2020 23:01:45 -0700 (PDT) Received: by mail-pl1-x644.google.com with SMTP id t16so7603432plo.7 for ; Mon, 08 Jun 2020 23:01:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=w3OWjopJiJ8RsgPU4aTIHZRKWMBVX2D/YDzUOaSnLoQ=; b=UyT/VVi1snnSqFHNUyttnXaR9uah6ahY070/Xb5R9zRJ3xhO0zVVme2UuiB5NeXaqn mhbyu4oa1JQ8Kc+LUeJgptjBsxdwGF1rVL7l64Wq3LjS6i+E3SWWWx2H8zoWMnmOyvXA ieTE7gJyCLJhl8BYqlUnFZWFdYvbSCNC3dYeRnGZmbLxuYfT7xC9XFtEgKwRuFcfRrwq 95A28EvW0iZVs546Mu38rd1G0TC5t1F0+ZcabhSEkUj45++vT09KUrx0h7g8r2lQASWs FxuxUPzVkM9Az+d7h1vdDDR7w6Go04q9hgMaYjiF1zQ+53ny2bG8Yf3bKsXhsQnyd6Jg B8Tg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=w3OWjopJiJ8RsgPU4aTIHZRKWMBVX2D/YDzUOaSnLoQ=; b=N+vdabw9xDHVxt8xZV6UNz64RrJFgvI6sApmF7JzhNp3oXzPqaWK+LSi73fX8FKQX+ 4WLp+azcTB1KboMONT06Qjl+Gs1ouu+RrifSqc9Gf3zKcUTriOL58jYKRWll11YDZbFs yTFmdyWAHWNHGj7BrnG1J/NcXjH9tXV4iXa9md9B6WMj8B8Q12iaRX1BC9oBChG5FjVj vqDA4FyTFpnl3/Y4IggvqWxcC83cKrjCN0FOawMtBitFZbegRBJxnjqEpnLv/9YYi+1S wAFjn4vP6JQkwaxOf+BFElfHSet4CoDZpNwjfYaj1wVFCXvVatSXvRgyEnRW4YJKTzVK 2Nnw== X-Gm-Message-State: AOAM530A4zKmww5hq5zcZMGOhQFr0xULkQIFsKYtllEtwU1ka5Sc1r18 O2mCFf4x46Csw5L9ZB1tMqjSDHg23qU= X-Google-Smtp-Source: ABdhPJz3HuVYZAgcD8FQONTJpDKkWt6Ww80j38zfYBQl1EAqdrF5Dwf+v/7voEdjJ7hGVKzGtJTf9w== X-Received: by 2002:a17:902:599a:: with SMTP id p26mr1990863pli.322.1591682504716; Mon, 08 Jun 2020 23:01:44 -0700 (PDT) Received: from daehojeong1.seo.corp.google.com ([2401:fa00:d:1:b8f4:bbde:37ba:20bd]) by smtp.gmail.com with ESMTPSA id k7sm6462153pfp.84.2020.06.08.23.01.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jun 2020 23:01:43 -0700 (PDT) From: Daeho Jeong To: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, kernel-team@android.com Cc: Daeho Jeong Subject: [PATCH] f2fs: add F2FS_IOC_SEC_TRIM_FILE ioctl Date: Tue, 9 Jun 2020 15:01:37 +0900 Message-Id: <20200609060137.143501-1-daeho43@gmail.com> X-Mailer: git-send-email 2.27.0.278.ge193c7cf3a9-goog MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Daeho Jeong Added a new ioctl to send discard commands or/and zero out to whole data area of a regular file for security reason. Signed-off-by: Daeho Jeong --- fs/f2fs/f2fs.h | 8 +++ fs/f2fs/file.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 157 insertions(+) diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index c812fb8e2d9c..ca139fac5a73 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -434,6 +434,7 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal, _IOR(F2FS_IOCTL_MAGIC, 18, __u64) #define F2FS_IOC_RESERVE_COMPRESS_BLOCKS \ _IOR(F2FS_IOCTL_MAGIC, 19, __u64) +#define F2FS_IOC_SEC_TRIM_FILE _IOW(F2FS_IOCTL_MAGIC, 20, __u32) #define F2FS_IOC_GET_VOLUME_NAME FS_IOC_GETFSLABEL #define F2FS_IOC_SET_VOLUME_NAME FS_IOC_SETFSLABEL @@ -453,6 +454,13 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal, #define F2FS_GOING_DOWN_METAFLUSH 0x3 /* going down with meta flush */ #define F2FS_GOING_DOWN_NEED_FSCK 0x4 /* going down to trigger fsck */ +/* + * Flags used by F2FS_IOC_SEC_TRIM_FILE + */ +#define F2FS_TRIM_FILE_DISCARD 0x1 /* send discard command */ +#define F2FS_TRIM_FILE_ZEROOUT 0x2 /* zero out */ +#define F2FS_TRIM_FILE_MASK 0x3 + #if defined(__KERNEL__) && defined(CONFIG_COMPAT) /* * ioctl commands in 32 bit emulation diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index dfa1ac2d751a..df5149a4a627 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -3749,6 +3749,152 @@ static int f2fs_reserve_compress_blocks(struct file *filp, unsigned long arg) return ret; } +static int f2fs_secure_erase(struct block_device *bdev, block_t block, + block_t len, u32 flags) +{ + struct request_queue *q = bdev_get_queue(bdev); + sector_t sector = SECTOR_FROM_BLOCK(block); + sector_t nr_sects = SECTOR_FROM_BLOCK(len); + int ret = 0; + + if (!q) + return -ENXIO; + + if (flags & F2FS_TRIM_FILE_DISCARD) + ret = blkdev_issue_discard(bdev, sector, nr_sects, GFP_NOFS, + blk_queue_secure_erase(q) ? + BLKDEV_DISCARD_SECURE : 0); + + if (!ret && flags & F2FS_TRIM_FILE_ZEROOUT) + ret = blkdev_issue_zeroout(bdev, sector, nr_sects, GFP_NOFS, 0); + + return ret; +} + +static int f2fs_sec_trim_file(struct file *filp, unsigned long arg) +{ + struct inode *inode = file_inode(filp); + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + struct address_space *mapping = inode->i_mapping; + struct block_device *prev_bdev = NULL; + loff_t file_size; + pgoff_t index, pg_start = 0, pg_end; + block_t prev_block = 0, len = 0; + u32 flags; + int ret = 0; + + if (!S_ISREG(inode->i_mode) || f2fs_is_atomic_file(inode) || + f2fs_compressed_file(inode)) + return -EINVAL; + + if (f2fs_readonly(sbi->sb)) + return -EROFS; + + if (f2fs_lfs_mode(sbi)) + return -EOPNOTSUPP; + + if (get_user(flags, (u32 __user *)arg)) + return -EFAULT; + if (!(flags & F2FS_TRIM_FILE_MASK)) + return -EINVAL; + + if (flags & F2FS_TRIM_FILE_DISCARD && !f2fs_hw_support_discard(sbi)) + return -EOPNOTSUPP; + + ret = mnt_want_write_file(filp); + if (ret) + return ret; + + inode_lock(inode); + + file_size = i_size_read(inode); + if (!file_size) + goto err; + pg_end = (pgoff_t)round_up(file_size, PAGE_SIZE) >> PAGE_SHIFT; + + ret = f2fs_convert_inline_inode(inode); + if (ret) + goto err; + + down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]); + down_write(&F2FS_I(inode)->i_mmap_sem); + + ret = filemap_write_and_wait(mapping); + if (ret) + goto out; + + truncate_inode_pages(mapping, 0); + + for (index = pg_start; index < pg_end;) { + struct dnode_of_data dn; + unsigned int end_offset; + + set_new_dnode(&dn, inode, NULL, NULL, 0); + ret = f2fs_get_dnode_of_data(&dn, index, LOOKUP_NODE); + if (ret) + goto out; + + end_offset = ADDRS_PER_PAGE(dn.node_page, inode); + if (pg_end < end_offset + index) + end_offset = pg_end - index; + + for (; dn.ofs_in_node < end_offset; + dn.ofs_in_node++, index++) { + struct block_device *cur_bdev; + block_t blkaddr = f2fs_data_blkaddr(&dn); + + if (__is_valid_data_blkaddr(blkaddr)) { + if (!f2fs_is_valid_blkaddr(F2FS_I_SB(inode), + blkaddr, DATA_GENERIC_ENHANCE)) { + ret = -EFSCORRUPTED; + goto out; + } + } else + continue; + + cur_bdev = f2fs_target_device(sbi, blkaddr, NULL); + if (f2fs_is_multi_device(sbi)) { + int i = f2fs_target_device_index(sbi, blkaddr); + + blkaddr -= FDEV(i).start_blk; + } + + if (len) { + if (prev_bdev == cur_bdev && + blkaddr == prev_block + len) { + len++; + } else { + ret = f2fs_secure_erase(prev_bdev, + prev_block, len, flags); + if (ret) + goto out; + + len = 0; + } + } + + if (!len) { + prev_bdev = cur_bdev; + prev_block = blkaddr; + len = 1; + } + } + + f2fs_put_dnode(&dn); + } + + if (len) + ret = f2fs_secure_erase(prev_bdev, prev_block, len, flags); +out: + up_write(&F2FS_I(inode)->i_mmap_sem); + up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]); +err: + inode_unlock(inode); + mnt_drop_write_file(filp); + + return ret; +} + long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { if (unlikely(f2fs_cp_error(F2FS_I_SB(file_inode(filp))))) @@ -3835,6 +3981,8 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) return f2fs_release_compress_blocks(filp, arg); case F2FS_IOC_RESERVE_COMPRESS_BLOCKS: return f2fs_reserve_compress_blocks(filp, arg); + case F2FS_IOC_SEC_TRIM_FILE: + return f2fs_sec_trim_file(filp, arg); default: return -ENOTTY; } @@ -4004,6 +4152,7 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) case F2FS_IOC_GET_COMPRESS_BLOCKS: case F2FS_IOC_RELEASE_COMPRESS_BLOCKS: case F2FS_IOC_RESERVE_COMPRESS_BLOCKS: + case F2FS_IOC_SEC_TRIM_FILE: break; default: return -ENOIOCTLCMD; -- 2.27.0.278.ge193c7cf3a9-goog