From patchwork Wed Apr 22 21:20:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 11504623 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1BD581575 for ; Wed, 22 Apr 2020 21:22:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 06CA72084D for ; Wed, 22 Apr 2020 21:22:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726714AbgDVVVV (ORCPT ); Wed, 22 Apr 2020 17:21:21 -0400 Received: from mga11.intel.com ([192.55.52.93]:12966 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726335AbgDVVVR (ORCPT ); Wed, 22 Apr 2020 17:21:17 -0400 IronPort-SDR: 8jgz5v7oP61vjBrS3pxlGp5iTyIx3u9IvJ8XLqXH0RJAu4ax3EhQpNZTpMnW0PtuMPRCSDs7Vr g0d2X3djZdzQ== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:16 -0700 IronPort-SDR: kExJ3fAAktfWxz+ppsCTqVQnwvQ/6bsHAHMHFol38eHebWnqp8A5j0haWRKOXkoRq1nigFjYaP UFN9bhcJ1fWA== X-IronPort-AV: E=Sophos;i="5.73,304,1583222400"; d="scan'208";a="334752640" Received: from iweiny-desk2.sc.intel.com (HELO localhost) ([10.3.52.147]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:16 -0700 From: ira.weiny@intel.com To: linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, "Darrick J. Wong" Cc: Ira Weiny , Dave Chinner , Al Viro , Jan Kara , Dan Williams , Dave Chinner , Christoph Hellwig , "Theodore Y. Ts'o" , Jeff Moyer , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH V10 01/11] fs/xfs: Remove unnecessary initialization of i_rwsem Date: Wed, 22 Apr 2020 14:20:52 -0700 Message-Id: <20200422212102.3757660-2-ira.weiny@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200422212102.3757660-1-ira.weiny@intel.com> References: <20200422212102.3757660-1-ira.weiny@intel.com> MIME-Version: 1.0 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org From: Ira Weiny An earlier call of xfs_reinit_inode() from xfs_iget_cache_hit() already handles initialization of i_rwsem. Doing so again is unneeded. Reviewed-by: Darrick J. Wong Reviewed-by: Dave Chinner Signed-off-by: Ira Weiny --- Changes from V4: Update commit message to make it clear the xfs_iget_cache_hit() is actually doing the initialization via xfs_reinit_inode() New for V4: NOTE: This was found while ensuring the new i_aops_sem was properly handled. It seems like this is a layering violation so I think it is worth cleaning up so as to not confuse others. --- fs/xfs/xfs_icache.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c index 8bf1d15be3f6..17a0b86fe701 100644 --- a/fs/xfs/xfs_icache.c +++ b/fs/xfs/xfs_icache.c @@ -423,6 +423,7 @@ xfs_iget_cache_hit( spin_unlock(&ip->i_flags_lock); rcu_read_unlock(); + ASSERT(!rwsem_is_locked(&inode->i_rwsem)); error = xfs_reinit_inode(mp, inode); if (error) { bool wake; @@ -456,9 +457,6 @@ xfs_iget_cache_hit( ip->i_sick = 0; ip->i_checked = 0; - ASSERT(!rwsem_is_locked(&inode->i_rwsem)); - init_rwsem(&inode->i_rwsem); - spin_unlock(&ip->i_flags_lock); spin_unlock(&pag->pag_ici_lock); } else { From patchwork Wed Apr 22 21:20:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 11504625 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B488713B2 for ; Wed, 22 Apr 2020 21:22:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A8870215A4 for ; Wed, 22 Apr 2020 21:22:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726961AbgDVVWP (ORCPT ); Wed, 22 Apr 2020 17:22:15 -0400 Received: from mga18.intel.com ([134.134.136.126]:24777 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726116AbgDVVVU (ORCPT ); Wed, 22 Apr 2020 17:21:20 -0400 IronPort-SDR: 1ohNJLPiPz7lI3JlLmOr7nkLs3BmamoZQHZ4BRVjy2iji2FtsNdN7ezGP0S1XFjeYaWrIMCLT5 73btETRMQ3IA== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:19 -0700 IronPort-SDR: S2auKyJfl/wR/vW8f/SURq8zSGz9aCxNqu+pXA729LMWuIv+fHUut4o8EedrGSknJkgntenTLU IPCpmGczJAdw== X-IronPort-AV: E=Sophos;i="5.73,304,1583222400"; d="scan'208";a="365802102" Received: from iweiny-desk2.sc.intel.com (HELO localhost) ([10.3.52.147]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:19 -0700 From: ira.weiny@intel.com To: linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, "Darrick J. Wong" Cc: Ira Weiny , Jan Kara , Christoph Hellwig , Al Viro , Dan Williams , Dave Chinner , "Theodore Y. Ts'o" , Jeff Moyer , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH V10 02/11] fs: Remove unneeded IS_DAX() check in io_is_direct() Date: Wed, 22 Apr 2020 14:20:53 -0700 Message-Id: <20200422212102.3757660-3-ira.weiny@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200422212102.3757660-1-ira.weiny@intel.com> References: <20200422212102.3757660-1-ira.weiny@intel.com> MIME-Version: 1.0 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org From: Ira Weiny Remove the check because DAX now has it's own read/write methods and file systems which support DAX check IS_DAX() prior to IOCB_DIRECT on their own. Therefore, it does not matter if the file state is DAX when the iocb flags are created. Also remove io_is_direct() as it is just a simple flag check. Reviewed-by: Jan Kara Reviewed-by: Darrick J. Wong Reviewed-by: Christoph Hellwig Signed-off-by: Ira Weiny Reviewed-by: Dave Chinner --- Changes from v8: Rebase to latest Linus tree Changes from v6: remove io_is_direct() as well. Remove Reviews since this is quite a bit different. Changes from v3: Reword commit message. Reordered to be a 'pre-cleanup' patch --- drivers/block/loop.c | 6 +++--- include/linux/fs.h | 7 +------ 2 files changed, 4 insertions(+), 9 deletions(-) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index da693e6a834e..14372df0f354 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -634,8 +634,8 @@ static int do_req_filebacked(struct loop_device *lo, struct request *rq) static inline void loop_update_dio(struct loop_device *lo) { - __loop_update_dio(lo, io_is_direct(lo->lo_backing_file) | - lo->use_dio); + __loop_update_dio(lo, (lo->lo_backing_file->f_flags & O_DIRECT) | + lo->use_dio); } static void loop_reread_partitions(struct loop_device *lo, @@ -1028,7 +1028,7 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, if (!(lo_flags & LO_FLAGS_READ_ONLY) && file->f_op->fsync) blk_queue_write_cache(lo->lo_queue, true, false); - if (io_is_direct(lo->lo_backing_file) && inode->i_sb->s_bdev) { + if ((lo->lo_backing_file->f_flags & O_DIRECT) && inode->i_sb->s_bdev) { /* In case of direct I/O, match underlying block size */ unsigned short bsize = bdev_logical_block_size( inode->i_sb->s_bdev); diff --git a/include/linux/fs.h b/include/linux/fs.h index 4f6f59b4f22a..a87cc5845a02 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3394,11 +3394,6 @@ extern void setattr_copy(struct inode *inode, const struct iattr *attr); extern int file_update_time(struct file *file); -static inline bool io_is_direct(struct file *filp) -{ - return (filp->f_flags & O_DIRECT) || IS_DAX(filp->f_mapping->host); -} - static inline bool vma_is_dax(const struct vm_area_struct *vma) { return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host); @@ -3423,7 +3418,7 @@ static inline int iocb_flags(struct file *file) int res = 0; if (file->f_flags & O_APPEND) res |= IOCB_APPEND; - if (io_is_direct(file)) + if (file->f_flags & O_DIRECT) res |= IOCB_DIRECT; if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host)) res |= IOCB_DSYNC; From patchwork Wed Apr 22 21:20:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 11504587 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CEE4B13B2 for ; Wed, 22 Apr 2020 21:21:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C1EF82087E for ; Wed, 22 Apr 2020 21:21:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726746AbgDVVVY (ORCPT ); Wed, 22 Apr 2020 17:21:24 -0400 Received: from mga03.intel.com ([134.134.136.65]:61791 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726335AbgDVVVX (ORCPT ); Wed, 22 Apr 2020 17:21:23 -0400 IronPort-SDR: R8hK6WVqalJvLlW62E8W2yVM30nXxFiPriK6t2OTWVrl1mKntftQbCKmMZEqeQ4w/BZ78bfc5/ M0MMYayaunFA== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:23 -0700 IronPort-SDR: 6LFGzhwIHdD0+Oz7o839PJmfXgTQ31azzyb6ANiGxN8nceKmL0kXFKPTHuiA8zQibXzwVtaKBI n3DUuV4HQ8yQ== X-IronPort-AV: E=Sophos;i="5.73,304,1583222400"; d="scan'208";a="430071286" Received: from iweiny-desk2.sc.intel.com (HELO localhost) ([10.3.52.147]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:22 -0700 From: ira.weiny@intel.com To: linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, "Darrick J. Wong" Cc: Ira Weiny , Dave Chinner , Jan Kara , Al Viro , Dan Williams , Dave Chinner , Christoph Hellwig , "Theodore Y. Ts'o" , Jeff Moyer , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH V10 03/11] fs/stat: Define DAX statx attribute Date: Wed, 22 Apr 2020 14:20:54 -0700 Message-Id: <20200422212102.3757660-4-ira.weiny@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200422212102.3757660-1-ira.weiny@intel.com> References: <20200422212102.3757660-1-ira.weiny@intel.com> MIME-Version: 1.0 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org From: Ira Weiny In order for users to determine if a file is currently operating in DAX state (effective DAX). Define a statx attribute value and set that attribute if the effective DAX flag is set. To go along with this we propose the following addition to the statx man page: STATX_ATTR_DAX The file is in the DAX (cpu direct access) state. DAX state attempts to minimize software cache effects for both I/O and memory mappings of this file. It requires a file system which has been configured to support DAX. DAX generally assumes all accesses are via cpu load / store instructions which can minimize overhead for small accesses, but may adversely affect cpu utilization for large transfers. File I/O is done directly to/from user-space buffers and memory mapped I/O may be performed with direct memory mappings that bypass kernel page cache. While the DAX property tends to result in data being transferred synchronously, it does not give the same guarantees of O_SYNC where data and the necessary metadata are transferred together. A DAX file may support being mapped with the MAP_SYNC flag, which enables a program to use CPU cache flush instructions to persist CPU store operations without an explicit fsync(2). See mmap(2) for more information. Reviewed-by: Dave Chinner Reviewed-by: Jan Kara Reviewed-by: Darrick J. Wong Signed-off-by: Ira Weiny --- Changes from V2: Update man page text with comments from Darrick, Jan, Dan, and Dave. --- fs/stat.c | 3 +++ include/uapi/linux/stat.h | 1 + 2 files changed, 4 insertions(+) diff --git a/fs/stat.c b/fs/stat.c index 030008796479..894699c74dde 100644 --- a/fs/stat.c +++ b/fs/stat.c @@ -79,6 +79,9 @@ int vfs_getattr_nosec(const struct path *path, struct kstat *stat, if (IS_AUTOMOUNT(inode)) stat->attributes |= STATX_ATTR_AUTOMOUNT; + if (IS_DAX(inode)) + stat->attributes |= STATX_ATTR_DAX; + if (inode->i_op->getattr) return inode->i_op->getattr(path, stat, request_mask, query_flags); diff --git a/include/uapi/linux/stat.h b/include/uapi/linux/stat.h index ad80a5c885d5..e5f9d5517f6b 100644 --- a/include/uapi/linux/stat.h +++ b/include/uapi/linux/stat.h @@ -169,6 +169,7 @@ struct statx { #define STATX_ATTR_ENCRYPTED 0x00000800 /* [I] File requires key to decrypt in fs */ #define STATX_ATTR_AUTOMOUNT 0x00001000 /* Dir: Automount trigger */ #define STATX_ATTR_VERITY 0x00100000 /* [I] Verity protected file */ +#define STATX_ATTR_DAX 0x00002000 /* [I] File is DAX */ #endif /* _UAPI_LINUX_STAT_H */ From patchwork Wed Apr 22 21:20:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 11504591 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2B9F713B2 for ; Wed, 22 Apr 2020 21:21:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1C588215A4 for ; Wed, 22 Apr 2020 21:21:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726779AbgDVVV2 (ORCPT ); Wed, 22 Apr 2020 17:21:28 -0400 Received: from mga07.intel.com ([134.134.136.100]:1870 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726335AbgDVVV1 (ORCPT ); Wed, 22 Apr 2020 17:21:27 -0400 IronPort-SDR: rHzeqEOVPkz4Xq5a1fPK9aR4MHpDF0LDOWEHrie6OUgqnbtNYSw5a/m7igClz3by7Guo0aQ30E 5oEBbSPk/ymw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:26 -0700 IronPort-SDR: 8jPYw4gEq8DWs2Io9+I8CgwRr9gIo5e8SnNLkTGqiLgyjJm5vqxlYNGqNksdIttSurNabmInjO KMX2qSF+rwYA== X-IronPort-AV: E=Sophos;i="5.73,304,1583222400"; d="scan'208";a="456661881" Received: from iweiny-desk2.sc.intel.com (HELO localhost) ([10.3.52.147]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:26 -0700 From: ira.weiny@intel.com To: linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, "Darrick J. Wong" Cc: Ira Weiny , Jan Kara , Al Viro , Dan Williams , Dave Chinner , Christoph Hellwig , "Theodore Y. Ts'o" , Jeff Moyer , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH V10 04/11] Documentation/dax: Update Usage section Date: Wed, 22 Apr 2020 14:20:55 -0700 Message-Id: <20200422212102.3757660-5-ira.weiny@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200422212102.3757660-1-ira.weiny@intel.com> References: <20200422212102.3757660-1-ira.weiny@intel.com> MIME-Version: 1.0 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org From: Ira Weiny Update the Usage section to reflect the new individual dax selection functionality. Reviewed-by: Jan Kara Signed-off-by: Ira Weiny --- Changes from V9: Fix missing ')' Fix trialing '"' Changes from V8: Updates from Darrick Changes from V7: Cleanups/clarifications from Darrick and Dan Changes from V6: Update to allow setting FS_XFLAG_DAX any time. Update with list of behaviors from Darrick https://lore.kernel.org/lkml/20200409165927.GD6741@magnolia/ Changes from V5: Update to reflect the agreed upon semantics https://lore.kernel.org/lkml/20200405061945.GA94792@iweiny-DESK2.sc.intel.com/ --- Documentation/filesystems/dax.txt | 164 +++++++++++++++++++++++++++++- 1 file changed, 161 insertions(+), 3 deletions(-) diff --git a/Documentation/filesystems/dax.txt b/Documentation/filesystems/dax.txt index 679729442fd2..553712c5054e 100644 --- a/Documentation/filesystems/dax.txt +++ b/Documentation/filesystems/dax.txt @@ -17,11 +17,169 @@ For file mappings, the storage device is mapped directly into userspace. Usage ----- -If you have a block device which supports DAX, you can make a filesystem +If you have a block device which supports DAX, you can make a file system on it as usual. The DAX code currently only supports files with a block size equal to your kernel's PAGE_SIZE, so you may need to specify a block -size when creating the filesystem. When mounting it, use the "-o dax" -option on the command line or add 'dax' to the options in /etc/fstab. +size when creating the file system. + +Currently 3 filesystems support DAX: ext2, ext4 and xfs. Enabling DAX on them +is different. + +Enabling DAX on ext4 and ext2 +----------------------------- + +When mounting the filesystem, use the "-o dax" option on the command line or +add 'dax' to the options in /etc/fstab. This works to enable DAX on all files +within the filesystem. It is equivalent to the '-o dax=always' behavior below. + + +Enabling DAX on xfs +------------------- + +Summary +------- + + 1. There exists an in-kernel file access mode flag S_DAX that corresponds to + the statx flag STATX_ATTR_DAX. See the manpage for statx(2) for details + about this access mode. + + 2. There exists an advisory file inode flag FS_XFLAG_DAX that is + inherited from the parent directory FS_XFLAG_DAX inode flag at file + creation time. This advisory flag can be set or cleared at any + time, but doing so does not immediately affect the S_DAX state. + + Unless overridden by mount options (see (3)), if FS_XFLAG_DAX is set + and the fs is on pmem then it will enable S_DAX at inode load time; + if FS_XFLAG_DAX is not set, it will not enable S_DAX. + + 3. There exists a dax= mount option. + + "-o dax=never" means "never set S_DAX, ignore FS_XFLAG_DAX." + + "-o dax=always" means "always set S_DAX (at least on pmem), + and ignore FS_XFLAG_DAX." + + "-o dax" is an alias for "dax=always". + + "-o dax=inode" means "follow FS_XFLAG_DAX" and is the default. + + 4. There exists an advisory directory inode flag FS_XFLAG_DAX that can + be set or cleared at any time. The flag state is inherited by any files or + subdirectories when they are created within that directory. + + 5. Programs that require a specific file access mode (DAX or not DAX) + can do one of the following: + + (a) Create files in directories that the FS_XFLAG_DAX flag set as + needed; or + + (b) Have the administrator set an override via mount option; or + + (c) Set or clear the file's FS_XFLAG_DAX flag as needed. Programs + must then cause the kernel to evict the inode from memory. This + can be done by: + + i> Closing the file and re-opening the file and using statx to + see if the fs has changed the S_DAX flag; and + + ii> If the file still does not have the desired S_DAX access + mode, either unmount and remount the filesystem, or close + the file and use drop_caches. + + 6. It is expected that users who want to squeeze every last bit of performance + out of the particular rough and tumble bits of their storage will also be + exposed to the difficulties of what happens when the operating system can't + totally virtualize those hardware capabilities. DAX is such a feature. + + +Details +------- + +There are 2 per-file dax flags. One is a physical inode setting (FS_XFLAG_DAX) +and the other a currently enabled state (S_DAX). + +FS_XFLAG_DAX is maintained, on disk, on individual inodes. It is preserved +within the file system. This 'physical' config setting can be set using an +ioctl and/or an application such as "xfs_io -c 'chattr [-+]x'". Files and +directories automatically inherit FS_XFLAG_DAX from their parent directory +_when_ _created_. Therefore, setting FS_XFLAG_DAX at directory creation time +can be used to set a default behavior for an entire sub-tree. (Doing so on the +root directory acts to set a default for the entire file system.) + +To clarify inheritance here are 3 examples: + +Example A: + +mkdir -p a/b/c +xfs_io 'chattr +x' a +mkdir a/b/c/d +mkdir a/e + + dax: a,e + no dax: b,c,d + +Example B: + +mkdir a +xfs_io 'chattr +x' a +mkdir -p a/b/c/d + + dax: a,b,c,d + no dax: + +Example C: + +mkdir -p a/b/c +xfs_io 'chattr +x' c +mkdir a/b/c/d + + dax: c,d + no dax: a,b + + +The current enabled state (S_DAX) is set when a file inode is _loaded_ based on +the underlying media support, the value of FS_XFLAG_DAX, and the file systems +dax mount option setting. See below. + +statx can be used to query S_DAX. NOTE that a directory will never have S_DAX +set and therefore statx will never indicate that S_DAX is set on directories. + +NOTE: Setting the FS_XFLAG_DAX (specifically or through inheritance) occurs +even if the underlying media does not support dax and/or the file system is +overridden with a mount option. + + +Overriding FS_XFLAG_DAX (dax= mount option) +------------------------------------------- + +There exists a dax mount option. Using the mount option does not change the +physical configured state of individual files but overrides the S_DAX operating +state when inodes are loaded. + +Given underlying media support, the dax mount option is a tri-state option +(never, always, inode) with the following meanings: + + "-o dax=never" means "never set S_DAX, ignore FS_XFLAG_DAX" + "-o dax=always" means "always set S_DAX, ignore FS_XFLAG_DAX" + "-o dax" by itself means "dax=always" to remain compatible with older + kernels + "-o dax=inode" means "follow FS_XFLAG_DAX" + +The default state is 'inode'. Given underlying media support, the following +algorithm is used to determine the effective mode of the file S_DAX on a +capable device. + + S_DAX = FS_XFLAG_DAX; + + if (dax_mount == "always") + S_DAX = true; + else if (dax_mount == "off") + S_DAX = false; + +To reiterate: Setting, and inheritance, continues to affect FS_XFLAG_DAX even +while the file system is mounted with a dax override. However, in-core inode +state (S_DAX) will continue to be overridden until the filesystem is remounted +with dax=inode and the inode is evicted. Implementation Tips for Block Driver Writers From patchwork Wed Apr 22 21:20:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 11504621 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 06AB213B2 for ; Wed, 22 Apr 2020 21:22:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EE58520857 for ; Wed, 22 Apr 2020 21:22:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726795AbgDVVVc (ORCPT ); Wed, 22 Apr 2020 17:21:32 -0400 Received: from mga01.intel.com ([192.55.52.88]:56789 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726793AbgDVVVa (ORCPT ); Wed, 22 Apr 2020 17:21:30 -0400 IronPort-SDR: D+roYhrnt+ekcMX8X6+oYyYduqqz3GAVTkTdNYqtHs+mbN+yqUPXsnzo0dUMG/JzVp2pzpDKG9 j14mmWnwg7Xw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:29 -0700 IronPort-SDR: c9xFztEZXRhG6GOcrjlNNgz3chpm4OTPOXKGSpynGA78QWcinaZERifteDdIs1RXVweOXF70P7 cDQ/L7J/Q3CA== X-IronPort-AV: E=Sophos;i="5.73,304,1583222400"; d="scan'208";a="280170714" Received: from iweiny-desk2.sc.intel.com (HELO localhost) ([10.3.52.147]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:29 -0700 From: ira.weiny@intel.com To: linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, "Darrick J. Wong" Cc: Ira Weiny , Al Viro , Jan Kara , Dan Williams , Dave Chinner , Christoph Hellwig , "Theodore Y. Ts'o" , Jeff Moyer , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH V10 05/11] fs/xfs: Change XFS_MOUNT_DAX to XFS_MOUNT_DAX_ALWAYS Date: Wed, 22 Apr 2020 14:20:56 -0700 Message-Id: <20200422212102.3757660-6-ira.weiny@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200422212102.3757660-1-ira.weiny@intel.com> References: <20200422212102.3757660-1-ira.weiny@intel.com> MIME-Version: 1.0 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org From: Ira Weiny In prep for the new tri-state mount option which then introduces XFS_MOUNT_DAX_NEVER. Reviewed-by: Darrick J. Wong Signed-off-by: Ira Weiny Reviewed-by: Dave Chinner --- Changes from v8 Move bit to 26 --- fs/xfs/xfs_iops.c | 2 +- fs/xfs/xfs_mount.h | 3 +-- fs/xfs/xfs_super.c | 8 ++++---- 3 files changed, 6 insertions(+), 7 deletions(-) diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index f7a99b3bbcf7..462f89af479a 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c @@ -1248,7 +1248,7 @@ xfs_inode_supports_dax( return false; /* DAX mount option or DAX iflag must be set. */ - if (!(mp->m_flags & XFS_MOUNT_DAX) && + if (!(mp->m_flags & XFS_MOUNT_DAX_ALWAYS) && !(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)) return false; diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h index b2e4598fdf7d..f6123fb0113c 100644 --- a/fs/xfs/xfs_mount.h +++ b/fs/xfs/xfs_mount.h @@ -237,8 +237,7 @@ typedef struct xfs_mount { #define XFS_MOUNT_FILESTREAMS (1ULL << 24) /* enable the filestreams allocator */ #define XFS_MOUNT_NOATTR2 (1ULL << 25) /* disable use of attr2 format */ - -#define XFS_MOUNT_DAX (1ULL << 62) /* TEST ONLY! */ +#define XFS_MOUNT_DAX_ALWAYS (1ULL << 26) /* * Max and min values for mount-option defined I/O diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 424bb9a2d532..ce169d1c7474 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -129,7 +129,7 @@ xfs_fs_show_options( { XFS_MOUNT_GRPID, ",grpid" }, { XFS_MOUNT_DISCARD, ",discard" }, { XFS_MOUNT_LARGEIO, ",largeio" }, - { XFS_MOUNT_DAX, ",dax" }, + { XFS_MOUNT_DAX_ALWAYS, ",dax" }, { 0, NULL } }; struct xfs_mount *mp = XFS_M(root->d_sb); @@ -1261,7 +1261,7 @@ xfs_fc_parse_param( return 0; #ifdef CONFIG_FS_DAX case Opt_dax: - mp->m_flags |= XFS_MOUNT_DAX; + mp->m_flags |= XFS_MOUNT_DAX_ALWAYS; return 0; #endif default: @@ -1454,7 +1454,7 @@ xfs_fc_fill_super( if (XFS_SB_VERSION_NUM(&mp->m_sb) == XFS_SB_VERSION_5) sb->s_flags |= SB_I_VERSION; - if (mp->m_flags & XFS_MOUNT_DAX) { + if (mp->m_flags & XFS_MOUNT_DAX_ALWAYS) { bool rtdev_is_dax = false, datadev_is_dax; xfs_warn(mp, @@ -1468,7 +1468,7 @@ xfs_fc_fill_super( if (!rtdev_is_dax && !datadev_is_dax) { xfs_alert(mp, "DAX unsupported by block device. Turning off DAX."); - mp->m_flags &= ~XFS_MOUNT_DAX; + mp->m_flags &= ~XFS_MOUNT_DAX_ALWAYS; } if (xfs_sb_version_hasreflink(&mp->m_sb)) { xfs_alert(mp, From patchwork Wed Apr 22 21:20:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 11504613 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 052391575 for ; Wed, 22 Apr 2020 21:22:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EC45C20787 for ; Wed, 22 Apr 2020 21:22:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726821AbgDVVVf (ORCPT ); Wed, 22 Apr 2020 17:21:35 -0400 Received: from mga12.intel.com ([192.55.52.136]:52162 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726811AbgDVVVe (ORCPT ); Wed, 22 Apr 2020 17:21:34 -0400 IronPort-SDR: 8HKzvYj/Xq7NB785YTOxyFGYoY1bxEYDG596AspfVve09pQAuNKugp0qA7NKTgBwi59ruayuNi UowS9u0KsxEQ== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:32 -0700 IronPort-SDR: 1NEDCR4Tatg9zb/CkXvcV4CDejekOhfK/MCv9gMMAibXARW1+QsgKCWm7/UdPWfZwmGRUr5YJu sKLvaPI1aPsA== X-IronPort-AV: E=Sophos;i="5.73,304,1583222400"; d="scan'208";a="259207422" Received: from iweiny-desk2.sc.intel.com (HELO localhost) ([10.3.52.147]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:31 -0700 From: ira.weiny@intel.com To: linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, "Darrick J. Wong" Cc: Ira Weiny , Al Viro , Jan Kara , Dan Williams , Dave Chinner , Christoph Hellwig , "Theodore Y. Ts'o" , Jeff Moyer , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH V10 06/11] fs/xfs: Make DAX mount option a tri-state Date: Wed, 22 Apr 2020 14:20:57 -0700 Message-Id: <20200422212102.3757660-7-ira.weiny@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200422212102.3757660-1-ira.weiny@intel.com> References: <20200422212102.3757660-1-ira.weiny@intel.com> MIME-Version: 1.0 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org From: Ira Weiny As agreed upon[1]. We make the dax mount option a tri-state. '-o dax' continues to operate the same. We add 'always', 'never', and 'inode' (default). [1] https://lore.kernel.org/lkml/20200405061945.GA94792@iweiny-DESK2.sc.intel.com/ Signed-off-by: Ira Weiny --- Changes from V9: Fix indentation in xfs_mount_set_dax_mode() Do not report dax=inode Changes from v8: Move NEVER bit to 27 Use xfs signature style use xfs_dax_mode enum Changes from v7: Change to XFS_MOUNT_DAX_NEVER Changes from v6: Use 2 flag bits rather than a field. change iflag to inode Changes from v5: New Patch --- fs/xfs/xfs_mount.h | 1 + fs/xfs/xfs_super.c | 49 ++++++++++++++++++++++++++++++++++++++++++---- 2 files changed, 46 insertions(+), 4 deletions(-) diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h index f6123fb0113c..37bfb50db809 100644 --- a/fs/xfs/xfs_mount.h +++ b/fs/xfs/xfs_mount.h @@ -238,6 +238,7 @@ typedef struct xfs_mount { allocator */ #define XFS_MOUNT_NOATTR2 (1ULL << 25) /* disable use of attr2 format */ #define XFS_MOUNT_DAX_ALWAYS (1ULL << 26) +#define XFS_MOUNT_DAX_NEVER (1ULL << 27) /* * Max and min values for mount-option defined I/O diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index ce169d1c7474..a4028992b789 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -47,6 +47,39 @@ static struct kset *xfs_kset; /* top-level xfs sysfs dir */ static struct xfs_kobj xfs_dbg_kobj; /* global debug sysfs attrs */ #endif +enum xfs_dax_mode { + XFS_DAX_INODE = 0, + XFS_DAX_ALWAYS = 1, + XFS_DAX_NEVER = 2, +}; + +static void +xfs_mount_set_dax_mode( + struct xfs_mount *mp, + enum xfs_dax_mode mode) +{ + switch (mode) { + case XFS_DAX_INODE: + mp->m_flags &= ~(XFS_MOUNT_DAX_ALWAYS | XFS_MOUNT_DAX_NEVER); + break; + case XFS_DAX_ALWAYS: + mp->m_flags |= XFS_MOUNT_DAX_ALWAYS; + mp->m_flags &= ~XFS_MOUNT_DAX_NEVER; + break; + case XFS_DAX_NEVER: + mp->m_flags |= XFS_MOUNT_DAX_NEVER; + mp->m_flags &= ~XFS_MOUNT_DAX_ALWAYS; + break; + } +} + +static const struct constant_table dax_param_enums[] = { + {"inode", XFS_DAX_INODE }, + {"always", XFS_DAX_ALWAYS }, + {"never", XFS_DAX_NEVER }, + {} +}; + /* * Table driven mount option parser. */ @@ -59,7 +92,7 @@ enum { Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota, Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce, - Opt_discard, Opt_nodiscard, Opt_dax, + Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum, }; static const struct fs_parameter_spec xfs_fs_parameters[] = { @@ -103,6 +136,7 @@ static const struct fs_parameter_spec xfs_fs_parameters[] = { fsparam_flag("discard", Opt_discard), fsparam_flag("nodiscard", Opt_nodiscard), fsparam_flag("dax", Opt_dax), + fsparam_enum("dax", Opt_dax_enum, dax_param_enums), {} }; @@ -129,7 +163,6 @@ xfs_fs_show_options( { XFS_MOUNT_GRPID, ",grpid" }, { XFS_MOUNT_DISCARD, ",discard" }, { XFS_MOUNT_LARGEIO, ",largeio" }, - { XFS_MOUNT_DAX_ALWAYS, ",dax" }, { 0, NULL } }; struct xfs_mount *mp = XFS_M(root->d_sb); @@ -185,6 +218,11 @@ xfs_fs_show_options( if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT)) seq_puts(m, ",noquota"); + if (mp->m_flags & XFS_MOUNT_DAX_ALWAYS) + seq_puts(m, ",dax=always"); + else if (mp->m_flags & XFS_MOUNT_DAX_NEVER) + seq_puts(m, ",dax=never"); + return 0; } @@ -1261,7 +1299,10 @@ xfs_fc_parse_param( return 0; #ifdef CONFIG_FS_DAX case Opt_dax: - mp->m_flags |= XFS_MOUNT_DAX_ALWAYS; + xfs_mount_set_dax_mode(mp, XFS_DAX_ALWAYS); + return 0; + case Opt_dax_enum: + xfs_mount_set_dax_mode(mp, result.uint_32); return 0; #endif default: @@ -1468,7 +1509,7 @@ xfs_fc_fill_super( if (!rtdev_is_dax && !datadev_is_dax) { xfs_alert(mp, "DAX unsupported by block device. Turning off DAX."); - mp->m_flags &= ~XFS_MOUNT_DAX_ALWAYS; + xfs_mount_set_dax_mode(mp, XFS_DAX_NEVER); } if (xfs_sb_version_hasreflink(&mp->m_sb)) { xfs_alert(mp, From patchwork Wed Apr 22 21:20:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 11504617 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D045E1575 for ; Wed, 22 Apr 2020 21:22:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C3E27215A4 for ; Wed, 22 Apr 2020 21:22:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726151AbgDVVWE (ORCPT ); Wed, 22 Apr 2020 17:22:04 -0400 Received: from mga06.intel.com ([134.134.136.31]:17492 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726816AbgDVVVf (ORCPT ); Wed, 22 Apr 2020 17:21:35 -0400 IronPort-SDR: 6K5NvpJU25PlwKeJYeWyd7eCSOEiMSpzzWY+6M6oyF1fCncsELj0WBQ/J5/r44pgbBVa/6j/eV On5rdNBVOi5Q== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:34 -0700 IronPort-SDR: VAst1//Lp1w6hVpQx5pqVv+zn/ESuWkyKOR196eROu0NQJ1roUBX7wKidJcqg8TlMyhMHgGvlv VCE79/xXFI/g== X-IronPort-AV: E=Sophos;i="5.73,304,1583222400"; d="scan'208";a="255775163" Received: from iweiny-desk2.sc.intel.com (HELO localhost) ([10.3.52.147]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:34 -0700 From: ira.weiny@intel.com To: linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, "Darrick J. Wong" Cc: Ira Weiny , Al Viro , Jan Kara , Dan Williams , Dave Chinner , Christoph Hellwig , "Theodore Y. Ts'o" , Jeff Moyer , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH V10 07/11] fs/xfs: Create function xfs_inode_should_enable_dax() Date: Wed, 22 Apr 2020 14:20:58 -0700 Message-Id: <20200422212102.3757660-8-ira.weiny@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200422212102.3757660-1-ira.weiny@intel.com> References: <20200422212102.3757660-1-ira.weiny@intel.com> MIME-Version: 1.0 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org From: Ira Weiny xfs_inode_supports_dax() should reflect if the inode can support DAX not that it is enabled for DAX. Change the use of xfs_inode_supports_dax() to reflect only if the inode and underlying storage support dax. Add a new function xfs_inode_should_enable_dax() which reflects if the inode should be enabled for DAX. Reviewed-by: Darrick J. Wong Signed-off-by: Ira Weiny Reviewed-by: Dave Chinner --- Changes from V8 Change to 'should enable' (feedback given by Jan in ext4 series) Darrick I've preserved your Reviewed-by for now LMK if that is an issue. Changes from v7: Move S_ISREG check first use IS_ENABLED(CONFIG_FS_DAX) rather than duplicated function Changes from v6: Change enable checks to be sequential logic. Update for 2 bit tri-state option. Make 'static' consistent. Don't set S_DAX if !CONFIG_FS_DAX Changes from v5: Update to reflect the new tri-state mount option Changes from v3: Update functions and names to be more clear Update commit message Merge with 'fs/xfs: Clean up DAX support check' don't allow IS_DAX() on a directory use STATIC macro for static make xfs_inode_supports_dax() static --- fs/xfs/xfs_iops.c | 28 ++++++++++++++++++++++------ 1 file changed, 22 insertions(+), 6 deletions(-) diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index 462f89af479a..1814f10e43d3 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c @@ -1243,13 +1243,12 @@ xfs_inode_supports_dax( { struct xfs_mount *mp = ip->i_mount; - /* Only supported on non-reflinked files. */ - if (!S_ISREG(VFS_I(ip)->i_mode) || xfs_is_reflink_inode(ip)) + /* Only supported on regular files. */ + if (!S_ISREG(VFS_I(ip)->i_mode)) return false; - /* DAX mount option or DAX iflag must be set. */ - if (!(mp->m_flags & XFS_MOUNT_DAX_ALWAYS) && - !(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)) + /* Only supported on non-reflinked files. */ + if (xfs_is_reflink_inode(ip)) return false; /* Block size must match page size */ @@ -1260,6 +1259,23 @@ xfs_inode_supports_dax( return xfs_inode_buftarg(ip)->bt_daxdev != NULL; } +static bool +xfs_inode_should_enable_dax( + struct xfs_inode *ip) +{ + if (!IS_ENABLED(CONFIG_FS_DAX)) + return false; + if (ip->i_mount->m_flags & XFS_MOUNT_DAX_NEVER) + return false; + if (!xfs_inode_supports_dax(ip)) + return false; + if (ip->i_mount->m_flags & XFS_MOUNT_DAX_ALWAYS) + return true; + if (ip->i_d.di_flags2 & XFS_DIFLAG2_DAX) + return true; + return false; +} + STATIC void xfs_diflags_to_iflags( struct inode *inode, @@ -1278,7 +1294,7 @@ xfs_diflags_to_iflags( inode->i_flags |= S_SYNC; if (flags & XFS_DIFLAG_NOATIME) inode->i_flags |= S_NOATIME; - if (xfs_inode_supports_dax(ip)) + if (xfs_inode_should_enable_dax(ip)) inode->i_flags |= S_DAX; } From patchwork Wed Apr 22 21:20:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 11504595 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D1A4713B2 for ; Wed, 22 Apr 2020 21:21:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BF34520857 for ; Wed, 22 Apr 2020 21:21:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726851AbgDVVVi (ORCPT ); Wed, 22 Apr 2020 17:21:38 -0400 Received: from mga09.intel.com ([134.134.136.24]:54658 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726846AbgDVVVh (ORCPT ); Wed, 22 Apr 2020 17:21:37 -0400 IronPort-SDR: ie16WaTaWCgIIZKUou7r779tZJdhTf/AlmgLRJkXSvwo5Tm9Srkv/iuBvXrMYnzlDA41z+PP2f 7mrb1MkwIBHQ== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:37 -0700 IronPort-SDR: eXhfMtDxXJJti4vJubvOlUhmhCvl3eswh7LpEfZF+Eu6+9elO9fTiQyfAxsyzsk0dXzUJL2sTk Y47W5CnqmbIQ== X-IronPort-AV: E=Sophos;i="5.73,304,1583222400"; d="scan'208";a="457284253" Received: from iweiny-desk2.sc.intel.com (HELO localhost) ([10.3.52.147]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:36 -0700 From: ira.weiny@intel.com To: linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, "Darrick J. Wong" Cc: Ira Weiny , Al Viro , Jan Kara , Dan Williams , Dave Chinner , Christoph Hellwig , "Theodore Y. Ts'o" , Jeff Moyer , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH V10 08/11] fs/xfs: Combine xfs_diflags_to_linux() and xfs_diflags_to_iflags() Date: Wed, 22 Apr 2020 14:20:59 -0700 Message-Id: <20200422212102.3757660-9-ira.weiny@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200422212102.3757660-1-ira.weiny@intel.com> References: <20200422212102.3757660-1-ira.weiny@intel.com> MIME-Version: 1.0 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org From: Ira Weiny The functionality in xfs_diflags_to_linux() and xfs_diflags_to_iflags() are nearly identical. The only difference is that *_to_linux() is called after inode setup and disallows changing the DAX flag. Combining them can be done with a flag which indicates if this is the initial setup to allow the DAX flag to be properly set only at init time. So remove xfs_diflags_to_linux() and call the modified xfs_diflags_to_iflags() directly. While we are here simplify xfs_diflags_to_iflags() to take struct xfs_inode and use xfs_ip2xflags() to ensure future diflags are included correctly. Reviewed-by: Darrick J. Wong Signed-off-by: Ira Weiny Reviewed-by: Dave Chinner --- Changes from V7: Clarify with a comment the reason for leaving S_DAX out of the mask Changes from V6: Move unrelated hunk to previous patch. Change logic for better code generation. Changes from V5: The functions are no longer identical so we can only combine them rather than deleting one completely. This is reflected in the new init parameter. --- fs/xfs/xfs_inode.h | 1 + fs/xfs/xfs_ioctl.c | 33 +-------------------------------- fs/xfs/xfs_iops.c | 46 +++++++++++++++++++++++++++------------------- 3 files changed, 29 insertions(+), 51 deletions(-) diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index c6a63f6764a6..83073c883fbf 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -467,6 +467,7 @@ int xfs_break_layouts(struct inode *inode, uint *iolock, /* from xfs_iops.c */ extern void xfs_setup_inode(struct xfs_inode *ip); extern void xfs_setup_iops(struct xfs_inode *ip); +extern void xfs_diflags_to_iflags(struct xfs_inode *ip, bool init); /* * When setting up a newly allocated inode, we need to call diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index 309958186d33..104495ac187c 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -1201,37 +1201,6 @@ xfs_flags2diflags2( return di_flags2; } -STATIC void -xfs_diflags_to_linux( - struct xfs_inode *ip) -{ - struct inode *inode = VFS_I(ip); - unsigned int xflags = xfs_ip2xflags(ip); - - if (xflags & FS_XFLAG_IMMUTABLE) - inode->i_flags |= S_IMMUTABLE; - else - inode->i_flags &= ~S_IMMUTABLE; - if (xflags & FS_XFLAG_APPEND) - inode->i_flags |= S_APPEND; - else - inode->i_flags &= ~S_APPEND; - if (xflags & FS_XFLAG_SYNC) - inode->i_flags |= S_SYNC; - else - inode->i_flags &= ~S_SYNC; - if (xflags & FS_XFLAG_NOATIME) - inode->i_flags |= S_NOATIME; - else - inode->i_flags &= ~S_NOATIME; -#if 0 /* disabled until the flag switching races are sorted out */ - if (xflags & FS_XFLAG_DAX) - inode->i_flags |= S_DAX; - else - inode->i_flags &= ~S_DAX; -#endif -} - static int xfs_ioctl_setattr_xflags( struct xfs_trans *tp, @@ -1269,7 +1238,7 @@ xfs_ioctl_setattr_xflags( ip->i_d.di_flags = xfs_flags2diflags(ip, fa->fsx_xflags); ip->i_d.di_flags2 = di_flags2; - xfs_diflags_to_linux(ip); + xfs_diflags_to_iflags(ip, false); xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG); xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); XFS_STATS_INC(mp, xs_ig_attrchg); diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index 1814f10e43d3..b70b735fe4a4 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c @@ -1276,26 +1276,34 @@ xfs_inode_should_enable_dax( return false; } -STATIC void +void xfs_diflags_to_iflags( - struct inode *inode, - struct xfs_inode *ip) + struct xfs_inode *ip, + bool init) { - uint16_t flags = ip->i_d.di_flags; - - inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC | - S_NOATIME | S_DAX); - - if (flags & XFS_DIFLAG_IMMUTABLE) - inode->i_flags |= S_IMMUTABLE; - if (flags & XFS_DIFLAG_APPEND) - inode->i_flags |= S_APPEND; - if (flags & XFS_DIFLAG_SYNC) - inode->i_flags |= S_SYNC; - if (flags & XFS_DIFLAG_NOATIME) - inode->i_flags |= S_NOATIME; - if (xfs_inode_should_enable_dax(ip)) - inode->i_flags |= S_DAX; + struct inode *inode = VFS_I(ip); + unsigned int xflags = xfs_ip2xflags(ip); + unsigned int flags = 0; + + ASSERT(!(IS_DAX(inode) && init)); + + if (xflags & FS_XFLAG_IMMUTABLE) + flags |= S_IMMUTABLE; + if (xflags & FS_XFLAG_APPEND) + flags |= S_APPEND; + if (xflags & FS_XFLAG_SYNC) + flags |= S_SYNC; + if (xflags & FS_XFLAG_NOATIME) + flags |= S_NOATIME; + if (init && xfs_inode_should_enable_dax(ip)) + flags |= S_DAX; + + /* + * S_DAX can only be set during inode initialization and is never set by + * the VFS, so we cannot mask off S_DAX in i_flags. + */ + inode->i_flags &= ~(S_IMMUTABLE | S_APPEND | S_SYNC | S_NOATIME); + inode->i_flags |= flags; } /* @@ -1321,7 +1329,7 @@ xfs_setup_inode( inode_fake_hash(inode); i_size_write(inode, ip->i_d.di_size); - xfs_diflags_to_iflags(inode, ip); + xfs_diflags_to_iflags(ip, true); if (S_ISDIR(inode->i_mode)) { /* From patchwork Wed Apr 22 21:21:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 11504599 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 97B6013B2 for ; Wed, 22 Apr 2020 21:21:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8B3AD21569 for ; 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22 Apr 2020 14:21:38 -0700 From: ira.weiny@intel.com To: linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, "Darrick J. Wong" Cc: Ira Weiny , Al Viro , Jan Kara , Dan Williams , Dave Chinner , Christoph Hellwig , "Theodore Y. Ts'o" , Jeff Moyer , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH V10 09/11] fs: Lift XFS_IDONTCACHE to the VFS layer Date: Wed, 22 Apr 2020 14:21:00 -0700 Message-Id: <20200422212102.3757660-10-ira.weiny@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200422212102.3757660-1-ira.weiny@intel.com> References: <20200422212102.3757660-1-ira.weiny@intel.com> MIME-Version: 1.0 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org From: Ira Weiny DAX effective mode (S_DAX) changes requires inode eviction. XFS has an advisory flag (XFS_IDONTCACHE) to prevent caching of the inode if no other additional references are taken. We lift this flag to the VFS layer and change the behavior slightly by allowing the flag to remain even if multiple references are taken. This will expedite the eviction of inodes to change S_DAX. Cc: Al Viro Reviewed-by: Jan Kara Signed-off-by: Ira Weiny Reviewed-by: Dave Chinner --- Changes from V9: Fix misspelling in commit subject move XFS_IEOFBLOCKS to '9' Changes from V8: Remove XFS_IDONTCACHE --- fs/xfs/xfs_icache.c | 4 ++-- fs/xfs/xfs_inode.h | 3 +-- fs/xfs/xfs_super.c | 2 +- include/linux/fs.h | 6 +++++- 4 files changed, 9 insertions(+), 6 deletions(-) diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c index 17a0b86fe701..de76f7f60695 100644 --- a/fs/xfs/xfs_icache.c +++ b/fs/xfs/xfs_icache.c @@ -477,7 +477,7 @@ xfs_iget_cache_hit( xfs_ilock(ip, lock_flags); if (!(flags & XFS_IGET_INCORE)) - xfs_iflags_clear(ip, XFS_ISTALE | XFS_IDONTCACHE); + xfs_iflags_clear(ip, XFS_ISTALE); XFS_STATS_INC(mp, xs_ig_found); return 0; @@ -559,7 +559,7 @@ xfs_iget_cache_miss( */ iflags = XFS_INEW; if (flags & XFS_IGET_DONTCACHE) - iflags |= XFS_IDONTCACHE; + VFS_I(ip)->i_state |= I_DONTCACHE; ip->i_udquot = NULL; ip->i_gdquot = NULL; ip->i_pdquot = NULL; diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index 83073c883fbf..d8ce3eaa246e 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -218,8 +218,7 @@ static inline bool xfs_inode_has_cow_data(struct xfs_inode *ip) #define XFS_IFLOCK (1 << __XFS_IFLOCK_BIT) #define __XFS_IPINNED_BIT 8 /* wakeup key for zero pin count */ #define XFS_IPINNED (1 << __XFS_IPINNED_BIT) -#define XFS_IDONTCACHE (1 << 9) /* don't cache the inode long term */ -#define XFS_IEOFBLOCKS (1 << 10)/* has the preallocblocks tag set */ +#define XFS_IEOFBLOCKS (1 << 9) /* has the preallocblocks tag set */ /* * If this unlinked inode is in the middle of recovery, don't let drop_inode * truncate and free the inode. This can happen if we iget the inode during diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index a4028992b789..284ab186798c 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -740,7 +740,7 @@ xfs_fs_drop_inode( return 0; } - return generic_drop_inode(inode) || (ip->i_flags & XFS_IDONTCACHE); + return generic_drop_inode(inode); } static void diff --git a/include/linux/fs.h b/include/linux/fs.h index a87cc5845a02..44bd45af760f 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2156,6 +2156,8 @@ static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src, * * I_CREATING New object's inode in the middle of setting up. * + * I_DONTCACHE Evict inode as soon as it is not used anymore. + * * Q: What is the difference between I_WILL_FREE and I_FREEING? */ #define I_DIRTY_SYNC (1 << 0) @@ -2178,6 +2180,7 @@ static inline void kiocb_clone(struct kiocb *kiocb, struct kiocb *kiocb_src, #define I_WB_SWITCH (1 << 13) #define I_OVL_INUSE (1 << 14) #define I_CREATING (1 << 15) +#define I_DONTCACHE (1 << 16) #define I_DIRTY_INODE (I_DIRTY_SYNC | I_DIRTY_DATASYNC) #define I_DIRTY (I_DIRTY_INODE | I_DIRTY_PAGES) @@ -3049,7 +3052,8 @@ extern int inode_needs_sync(struct inode *inode); extern int generic_delete_inode(struct inode *inode); static inline int generic_drop_inode(struct inode *inode) { - return !inode->i_nlink || inode_unhashed(inode); + return !inode->i_nlink || inode_unhashed(inode) || + (inode->i_state & I_DONTCACHE); } extern struct inode *ilookup5_nowait(struct super_block *sb, From patchwork Wed Apr 22 21:21:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 11504603 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2F79A1575 for ; Wed, 22 Apr 2020 21:21:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 22AEB2173E for ; Wed, 22 Apr 2020 21:21:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726893AbgDVVVo (ORCPT ); Wed, 22 Apr 2020 17:21:44 -0400 Received: from mga14.intel.com ([192.55.52.115]:44318 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726846AbgDVVVo (ORCPT ); Wed, 22 Apr 2020 17:21:44 -0400 IronPort-SDR: e1qZGSTbCNc4hqIO5ETxXRI4HPHT4nYDl6VpWAehxuEvxYop8T+uPdZwe43RbLW5V+WHn66ixf oyk6HzDohJcg== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:41 -0700 IronPort-SDR: IJtNw3E8sp6wG4v+Fu546RM3qtSa29cIMRwO8vrjlQWyavlhwOku7+0Ip+Q0IoY4W310Z/WGkp 6HtuVFz62P2A== X-IronPort-AV: E=Sophos;i="5.73,304,1583222400"; d="scan'208";a="244647509" Received: from iweiny-desk2.sc.intel.com (HELO localhost) ([10.3.52.147]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:40 -0700 From: ira.weiny@intel.com To: linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, "Darrick J. Wong" Cc: Ira Weiny , Al Viro , Jan Kara , Dan Williams , Dave Chinner , Christoph Hellwig , "Theodore Y. Ts'o" , Jeff Moyer , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH V10 10/11] fs: Introduce DCACHE_DONTCACHE Date: Wed, 22 Apr 2020 14:21:01 -0700 Message-Id: <20200422212102.3757660-11-ira.weiny@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200422212102.3757660-1-ira.weiny@intel.com> References: <20200422212102.3757660-1-ira.weiny@intel.com> MIME-Version: 1.0 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org From: Ira Weiny DCACHE_DONTCACHE indicates a dentry should not be cached on final dput(). Also add a helper function to mark DCACHE_DONTCACHE on all dentries pointing to a specific inode when that inode is being set I_DONTCACHE. This facilitates dropping dentry references to inodes sooner which require eviction to swap S_DAX mode. Cc: Al Viro Signed-off-by: Ira Weiny Reviewed-by: Jan Kara --- Changes from V9: modify i_state under i_lock Update comment "Purge from memory on final dput()" Changes from V8: Update commit message Use mark_inode_dontcache in XFS Fix locking... can't use rcu here. Change name to mark_inode_dontcache --- fs/dcache.c | 4 ++++ fs/inode.c | 15 +++++++++++++++ fs/xfs/xfs_icache.c | 2 +- include/linux/dcache.h | 2 ++ include/linux/fs.h | 1 + 5 files changed, 23 insertions(+), 1 deletion(-) diff --git a/fs/dcache.c b/fs/dcache.c index b280e07e162b..0030fabab2c4 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -647,6 +647,10 @@ static inline bool retain_dentry(struct dentry *dentry) if (dentry->d_op->d_delete(dentry)) return false; } + + if (unlikely(dentry->d_flags & DCACHE_DONTCACHE)) + return false; + /* retain; LRU fodder */ dentry->d_lockref.count--; if (unlikely(!(dentry->d_flags & DCACHE_LRU_LIST))) diff --git a/fs/inode.c b/fs/inode.c index 93d9252a00ab..316355433797 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -1526,6 +1526,21 @@ int generic_delete_inode(struct inode *inode) } EXPORT_SYMBOL(generic_delete_inode); +void mark_inode_dontcache(struct inode *inode) +{ + struct dentry *de; + + spin_lock(&inode->i_lock); + hlist_for_each_entry(de, &inode->i_dentry, d_u.d_alias) { + spin_lock(&de->d_lock); + de->d_flags |= DCACHE_DONTCACHE; + spin_unlock(&de->d_lock); + } + inode->i_state |= I_DONTCACHE; + spin_unlock(&inode->i_lock); +} +EXPORT_SYMBOL(mark_inode_dontcache); + /* * Called when we're dropping the last reference * to an inode. diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c index de76f7f60695..3c8f44477804 100644 --- a/fs/xfs/xfs_icache.c +++ b/fs/xfs/xfs_icache.c @@ -559,7 +559,7 @@ xfs_iget_cache_miss( */ iflags = XFS_INEW; if (flags & XFS_IGET_DONTCACHE) - VFS_I(ip)->i_state |= I_DONTCACHE; + mark_inode_dontcache(VFS_I(ip)); ip->i_udquot = NULL; ip->i_gdquot = NULL; ip->i_pdquot = NULL; diff --git a/include/linux/dcache.h b/include/linux/dcache.h index c1488cc84fd9..a81f0c3cf352 100644 --- a/include/linux/dcache.h +++ b/include/linux/dcache.h @@ -177,6 +177,8 @@ struct dentry_operations { #define DCACHE_REFERENCED 0x00000040 /* Recently used, don't discard. */ +#define DCACHE_DONTCACHE 0x00000080 /* Purge from memory on final dput() */ + #define DCACHE_CANT_MOUNT 0x00000100 #define DCACHE_GENOCIDE 0x00000200 #define DCACHE_SHRINK_LIST 0x00000400 diff --git a/include/linux/fs.h b/include/linux/fs.h index 44bd45af760f..064168ec2e0b 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3055,6 +3055,7 @@ static inline int generic_drop_inode(struct inode *inode) return !inode->i_nlink || inode_unhashed(inode) || (inode->i_state & I_DONTCACHE); } +extern void mark_inode_dontcache(struct inode *inode); extern struct inode *ilookup5_nowait(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), From patchwork Wed Apr 22 21:21:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 11504607 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 38DEC13B2 for ; Wed, 22 Apr 2020 21:21:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 27398217BA for ; Wed, 22 Apr 2020 21:21:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726930AbgDVVVw (ORCPT ); Wed, 22 Apr 2020 17:21:52 -0400 Received: from mga07.intel.com ([134.134.136.100]:1886 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726871AbgDVVVo (ORCPT ); Wed, 22 Apr 2020 17:21:44 -0400 IronPort-SDR: 30VjgZZgWcmhzo2gJEurIHnRH8AGW/9QuoNqUhtXOZf6De7a6+eMNlVHlQZHoRbyjufKAOehq4 iklVC69suUVw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:42 -0700 IronPort-SDR: +UfSJ3vT630rslmHCLLJkrGSXxLTIxjSrEl/bNe9/lnYTE5TcVzHTLzh0ZlpCWP8BDQ314QWsI jvpBEHaECbzA== X-IronPort-AV: E=Sophos;i="5.73,304,1583222400"; d="scan'208";a="246080472" Received: from iweiny-desk2.sc.intel.com (HELO localhost) ([10.3.52.147]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 14:21:42 -0700 From: ira.weiny@intel.com To: linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, "Darrick J. Wong" Cc: Ira Weiny , Al Viro , Jan Kara , Dan Williams , Dave Chinner , Christoph Hellwig , "Theodore Y. Ts'o" , Jeff Moyer , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH V10 11/11] fs/xfs: Update xfs_ioctl_setattr_dax_invalidate() Date: Wed, 22 Apr 2020 14:21:02 -0700 Message-Id: <20200422212102.3757660-12-ira.weiny@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200422212102.3757660-1-ira.weiny@intel.com> References: <20200422212102.3757660-1-ira.weiny@intel.com> MIME-Version: 1.0 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org From: Ira Weiny Because of the separation of FS_XFLAG_DAX from S_DAX and the delayed setting of S_DAX, data invalidation no longer needs to happen when FS_XFLAG_DAX is changed. Change xfs_ioctl_setattr_dax_invalidate() to be xfs_ioctl_dax_check_set_cache() and alter the code to reflect the new functionality. Furthermore, we no longer need the locking so we remove the join_flags logic. Signed-off-by: Ira Weiny --- Changes from V9: Change name of function to xfs_ioctl_setattr_prepare_dax() Changes from V8: Change name of function to xfs_ioctl_dax_check_set_cache() Update commit message Fix bit manipulations Changes from V7: Use new flag_inode_dontcache() Skip don't cache if mount over ride is active. Changes from v6: Fix completely broken implementation and update commit message. Use the new VFS layer I_DONTCACHE to facilitate inode eviction and S_DAX changing on drop_caches Changes from v5: New patch --- fs/xfs/xfs_ioctl.c | 108 +++++++++------------------------------------ 1 file changed, 20 insertions(+), 88 deletions(-) diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index 104495ac187c..aa1a8bd7d68d 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -1245,64 +1245,26 @@ xfs_ioctl_setattr_xflags( return 0; } -/* - * If we are changing DAX flags, we have to ensure the file is clean and any - * cached objects in the address space are invalidated and removed. This - * requires us to lock out other IO and page faults similar to a truncate - * operation. The locks need to be held until the transaction has been committed - * so that the cache invalidation is atomic with respect to the DAX flag - * manipulation. - */ -static int -xfs_ioctl_setattr_dax_invalidate( +static void +xfs_ioctl_setattr_prepare_dax( struct xfs_inode *ip, - struct fsxattr *fa, - int *join_flags) + struct fsxattr *fa) { - struct inode *inode = VFS_I(ip); - struct super_block *sb = inode->i_sb; - int error; - - *join_flags = 0; - - /* - * It is only valid to set the DAX flag on regular files and - * directories on filesystems where the block size is equal to the page - * size. On directories it serves as an inherited hint so we don't - * have to check the device for dax support or flush pagecache. - */ - if (fa->fsx_xflags & FS_XFLAG_DAX) { - struct xfs_buftarg *target = xfs_inode_buftarg(ip); - - if (!bdev_dax_supported(target->bt_bdev, sb->s_blocksize)) - return -EINVAL; - } - - /* If the DAX state is not changing, we have nothing to do here. */ - if ((fa->fsx_xflags & FS_XFLAG_DAX) && IS_DAX(inode)) - return 0; - if (!(fa->fsx_xflags & FS_XFLAG_DAX) && !IS_DAX(inode)) - return 0; + struct xfs_mount *mp = ip->i_mount; + struct inode *inode = VFS_I(ip); if (S_ISDIR(inode->i_mode)) - return 0; - - /* lock, flush and invalidate mapping in preparation for flag change */ - xfs_ilock(ip, XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL); - error = filemap_write_and_wait(inode->i_mapping); - if (error) - goto out_unlock; - error = invalidate_inode_pages2(inode->i_mapping); - if (error) - goto out_unlock; - - *join_flags = XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL; - return 0; + return; -out_unlock: - xfs_iunlock(ip, XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL); - return error; + if ((mp->m_flags & XFS_MOUNT_DAX_ALWAYS) || + (mp->m_flags & XFS_MOUNT_DAX_NEVER)) + return; + if (((fa->fsx_xflags & FS_XFLAG_DAX) && + !(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)) || + (!(fa->fsx_xflags & FS_XFLAG_DAX) && + (ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))) + mark_inode_dontcache(inode); } /* @@ -1310,17 +1272,10 @@ xfs_ioctl_setattr_dax_invalidate( * have permission to do so. On success, return a clean transaction and the * inode locked exclusively ready for further operation specific checks. On * failure, return an error without modifying or locking the inode. - * - * The inode might already be IO locked on call. If this is the case, it is - * indicated in @join_flags and we take full responsibility for ensuring they - * are unlocked from now on. Hence if we have an error here, we still have to - * unlock them. Otherwise, once they are joined to the transaction, they will - * be unlocked on commit/cancel. */ static struct xfs_trans * xfs_ioctl_setattr_get_trans( - struct xfs_inode *ip, - int join_flags) + struct xfs_inode *ip) { struct xfs_mount *mp = ip->i_mount; struct xfs_trans *tp; @@ -1337,8 +1292,7 @@ xfs_ioctl_setattr_get_trans( goto out_unlock; xfs_ilock(ip, XFS_ILOCK_EXCL); - xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | join_flags); - join_flags = 0; + xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); /* * CAP_FOWNER overrides the following restrictions: @@ -1359,8 +1313,6 @@ xfs_ioctl_setattr_get_trans( out_cancel: xfs_trans_cancel(tp); out_unlock: - if (join_flags) - xfs_iunlock(ip, join_flags); return ERR_PTR(error); } @@ -1486,7 +1438,6 @@ xfs_ioctl_setattr( struct xfs_dquot *pdqp = NULL; struct xfs_dquot *olddquot = NULL; int code; - int join_flags = 0; trace_xfs_ioctl_setattr(ip); @@ -1510,18 +1461,9 @@ xfs_ioctl_setattr( return code; } - /* - * Changing DAX config may require inode locking for mapping - * invalidation. These need to be held all the way to transaction commit - * or cancel time, so need to be passed through to - * xfs_ioctl_setattr_get_trans() so it can apply them to the join call - * appropriately. - */ - code = xfs_ioctl_setattr_dax_invalidate(ip, fa, &join_flags); - if (code) - goto error_free_dquots; + xfs_ioctl_setattr_prepare_dax(ip, fa); - tp = xfs_ioctl_setattr_get_trans(ip, join_flags); + tp = xfs_ioctl_setattr_get_trans(ip); if (IS_ERR(tp)) { code = PTR_ERR(tp); goto error_free_dquots; @@ -1651,7 +1593,6 @@ xfs_ioc_setxflags( struct fsxattr fa; struct fsxattr old_fa; unsigned int flags; - int join_flags = 0; int error; if (copy_from_user(&flags, arg, sizeof(flags))) @@ -1668,18 +1609,9 @@ xfs_ioc_setxflags( if (error) return error; - /* - * Changing DAX config may require inode locking for mapping - * invalidation. These need to be held all the way to transaction commit - * or cancel time, so need to be passed through to - * xfs_ioctl_setattr_get_trans() so it can apply them to the join call - * appropriately. - */ - error = xfs_ioctl_setattr_dax_invalidate(ip, &fa, &join_flags); - if (error) - goto out_drop_write; + xfs_ioctl_setattr_prepare_dax(ip, &fa); - tp = xfs_ioctl_setattr_get_trans(ip, join_flags); + tp = xfs_ioctl_setattr_get_trans(ip); if (IS_ERR(tp)) { error = PTR_ERR(tp); goto out_drop_write;