From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933282AbWFZWjm (ORCPT ); Mon, 26 Jun 2006 18:39:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933277AbWFZWjl (ORCPT ); Mon, 26 Jun 2006 18:39:41 -0400 Received: from cust9421.vic01.dataco.com.au ([203.171.70.205]:22199 "EHLO nigel.suspend2.net") by vger.kernel.org with ESMTP id S933274AbWFZWjf (ORCPT ); Mon, 26 Jun 2006 18:39:35 -0400 From: Nigel Cunningham Subject: [Suspend2][ 09/35] [Suspend2] Get filewriter target info. Date: Tue, 27 Jun 2006 08:39:33 +1000 To: linux-kernel@vger.kernel.org Message-Id: <20060626223932.4685.56666.stgit@nigel.suspend2.net> In-Reply-To: <20060626223902.4685.52543.stgit@nigel.suspend2.net> References: <20060626223902.4685.52543.stgit@nigel.suspend2.net> Content-Type: text/plain; charset=utf-8; format=fixed Content-Transfer-Encoding: 8bit User-Agent: StGIT/0.9 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Given the name of a target (eg /dev/hda3, /my-suspend-file, /dev/ttyS0), attempt to access it and discover the properties (inode, block size, dev_t, first block, storage available) we need to work with it. Signed-off-by: Nigel Cunningham kernel/power/suspend_file.c | 87 +++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 87 insertions(+), 0 deletions(-) diff --git a/kernel/power/suspend_file.c b/kernel/power/suspend_file.c index 7e06a06..6851977 100644 --- a/kernel/power/suspend_file.c +++ b/kernel/power/suspend_file.c @@ -278,3 +278,90 @@ static void reopen_resume_devt(void) set_devinfo(filewriter_target_bdev, target_inode->i_blkbits); } +static void filewriter_get_target_info(char *target, int get_size, + int resume2) +{ + if (target_file) + filewriter_cleanup(0); + + if (!target || !strlen(target)) + return; + + target_file = filp_open(target, O_RDWR, 0); + + if (IS_ERR(target_file) || !target_file) { + + if (!resume2) { + printk("Open file %s returned %p.\n", + target, target_file); + target_file = NULL; + return; + } + + target_file = NULL; + resume_dev_t = name_to_dev_t(target); + if (!resume_dev_t) { + printk("Open file %s returned %p and name_to_devt " + "failed.\n", + target, target_file); + if (!resume_dev_t) { + struct kstat stat; + int error = vfs_stat(target, &stat); + if (error) { + printk("Stating the file also failed." + " Nothing more we can do.\n"); + return; + } + resume_dev_t = stat.rdev; + } + return; + } + filewriter_target_bdev = open_by_devnum(resume_dev_t, FMODE_READ); + if (IS_ERR(filewriter_target_bdev)) { + printk("Got a dev_num (%lx) but failed to open it.\n", + (unsigned long) resume_dev_t); + return; + } + used_devt = 1; + target_inode = filewriter_target_bdev->bd_inode; + } else + target_inode = target_file->f_mapping->host; + + if (S_ISLNK(target_inode->i_mode) || + S_ISDIR(target_inode->i_mode) || + S_ISSOCK(target_inode->i_mode) || + S_ISFIFO(target_inode->i_mode)) { + printk("The filewriter works with regular files, character " + "files and block devices.\n"); + goto cleanup; + } + + if (!used_devt) { + if (S_ISBLK(target_inode->i_mode)) { + filewriter_target_bdev = I_BDEV(target_inode); + if (!bd_claim(filewriter_target_bdev, &filewriterops)) + target_claim = 1; + } else + filewriter_target_bdev = target_inode->i_sb->s_bdev; + resume_dev_t = filewriter_target_bdev->bd_dev; + } + + set_devinfo(filewriter_target_bdev, target_inode->i_blkbits); + + if (get_size) + target_storage_available = size_ignoring_ignored_pages(); + + if (!resume2) + target_firstblock = bmap(target_inode, 0) << devinfo.bmap_shift; + + return; +cleanup: + target_inode = NULL; + if (target_file) { + filp_close(target_file, NULL); + target_file = NULL; + } + set_devinfo(NULL, 0); + target_storage_available = 0; +} + -- Nigel Cunningham nigel at suspend2 dot net