From patchwork Wed Jul 8 21:19:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Goldwyn Rodrigues X-Patchwork-Id: 11652643 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 DEAC713BD for ; Wed, 8 Jul 2020 21:19:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CCF88206E2 for ; Wed, 8 Jul 2020 21:19:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726268AbgGHVTt (ORCPT ); Wed, 8 Jul 2020 17:19:49 -0400 Received: from mx2.suse.de ([195.135.220.15]:35398 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725903AbgGHVTs (ORCPT ); Wed, 8 Jul 2020 17:19:48 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id D3DF6AD33; Wed, 8 Jul 2020 21:19:46 +0000 (UTC) From: Goldwyn Rodrigues To: linux-btrfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, darrick.wong@oracle.com, hch@lst.de, cluster-devel@redhat.com, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, Goldwyn Rodrigues Subject: [PATCH 1/6] iomap: Convert wait_for_completion to flags Date: Wed, 8 Jul 2020 16:19:21 -0500 Message-Id: <20200708211926.7706-2-rgoldwyn@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200708211926.7706-1-rgoldwyn@suse.de> References: <20200708211926.7706-1-rgoldwyn@suse.de> MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: Goldwyn Rodrigues Convert wait_for_completion boolean to flags so we can pass more flags to iomap_dio_rw() Signed-off-by: Goldwyn Rodrigues --- fs/ext4/file.c | 11 +++++++++-- fs/gfs2/file.c | 14 ++++++++++---- fs/iomap/direct-io.c | 3 ++- fs/xfs/xfs_file.c | 15 +++++++++++---- fs/zonefs/super.c | 16 ++++++++++++---- include/linux/iomap.h | 11 ++++++++++- 6 files changed, 54 insertions(+), 16 deletions(-) diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 2a01e31a032c..8f6324eb6b27 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -53,6 +53,7 @@ static ssize_t ext4_dio_read_iter(struct kiocb *iocb, struct iov_iter *to) { ssize_t ret; struct inode *inode = file_inode(iocb->ki_filp); + unsigned int flags = 0; if (iocb->ki_flags & IOCB_NOWAIT) { if (!inode_trylock_shared(inode)) @@ -74,8 +75,11 @@ static ssize_t ext4_dio_read_iter(struct kiocb *iocb, struct iov_iter *to) return generic_file_read_iter(iocb, to); } + if (is_sync_kiocb(iocb)) + flags |= IOMAP_DIO_RWF_SYNCIO; + ret = iomap_dio_rw(iocb, to, &ext4_iomap_ops, NULL, - is_sync_kiocb(iocb)); + flags); inode_unlock_shared(inode); file_accessed(iocb->ki_filp); @@ -457,6 +461,7 @@ static ssize_t ext4_dio_write_iter(struct kiocb *iocb, struct iov_iter *from) const struct iomap_ops *iomap_ops = &ext4_iomap_ops; bool extend = false, unaligned_io = false; bool ilock_shared = true; + unsigned int flags = 0; /* * We initially start with shared inode lock unless it is @@ -540,10 +545,12 @@ static ssize_t ext4_dio_write_iter(struct kiocb *iocb, struct iov_iter *from) ext4_journal_stop(handle); } + if (is_sync_kiocb(iocb) || unaligned_io || extend) + flags |= IOMAP_DIO_RWF_SYNCIO; if (ilock_shared) iomap_ops = &ext4_iomap_overwrite_ops; ret = iomap_dio_rw(iocb, from, iomap_ops, &ext4_dio_write_ops, - is_sync_kiocb(iocb) || unaligned_io || extend); + flags); if (extend) ret = ext4_handle_inode_extension(inode, offset, ret, count); diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c index fe305e4bfd37..68f4ee4a20ee 100644 --- a/fs/gfs2/file.c +++ b/fs/gfs2/file.c @@ -767,6 +767,7 @@ static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to) size_t count = iov_iter_count(to); struct gfs2_holder gh; ssize_t ret; + unsigned int flags = 0; if (!count) return 0; /* skip atime */ @@ -776,8 +777,10 @@ static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to) if (ret) goto out_uninit; - ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL, - is_sync_kiocb(iocb)); + if (is_sync_kiocb(iocb)) + flags |= IOMAP_DIO_RWF_SYNCIO; + + ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL, flags); gfs2_glock_dq(&gh); out_uninit: @@ -794,6 +797,7 @@ static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from) loff_t offset = iocb->ki_pos; struct gfs2_holder gh; ssize_t ret; + unsigned int flags = 0; /* * Deferred lock, even if its a write, since we do no allocation on @@ -812,8 +816,10 @@ static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from) if (offset + len > i_size_read(&ip->i_inode)) goto out; - ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL, - is_sync_kiocb(iocb)); + if (is_sync_kiocb(iocb)) + flags |= IOMAP_DIO_RWF_SYNCIO; + + ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL, flags); out: gfs2_glock_dq(&gh); diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c index ec7b78e6feca..2753b7022403 100644 --- a/fs/iomap/direct-io.c +++ b/fs/iomap/direct-io.c @@ -405,7 +405,7 @@ iomap_dio_actor(struct inode *inode, loff_t pos, loff_t length, ssize_t iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter, const struct iomap_ops *ops, const struct iomap_dio_ops *dops, - bool wait_for_completion) + unsigned int dio_flags) { struct address_space *mapping = iocb->ki_filp->f_mapping; struct inode *inode = file_inode(iocb->ki_filp); @@ -415,6 +415,7 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter, unsigned int flags = IOMAP_DIRECT; struct blk_plug plug; struct iomap_dio *dio; + bool wait_for_completion = dio_flags & IOMAP_DIO_RWF_SYNCIO; if (!count) return 0; diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 00db81eac80d..6a7edb2c3167 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -169,6 +169,8 @@ xfs_file_dio_aio_read( struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp)); size_t count = iov_iter_count(to); ssize_t ret; + unsigned int flags = 0; + trace_xfs_file_direct_read(ip, count, iocb->ki_pos); @@ -183,8 +185,11 @@ xfs_file_dio_aio_read( } else { xfs_ilock(ip, XFS_IOLOCK_SHARED); } - ret = iomap_dio_rw(iocb, to, &xfs_read_iomap_ops, NULL, - is_sync_kiocb(iocb)); + + if (is_sync_kiocb(iocb)) + flags |= IOMAP_DIO_RWF_SYNCIO; + + ret = iomap_dio_rw(iocb, to, &xfs_read_iomap_ops, NULL, flags); xfs_iunlock(ip, XFS_IOLOCK_SHARED); return ret; @@ -483,6 +488,7 @@ xfs_file_dio_aio_write( int iolock; size_t count = iov_iter_count(from); struct xfs_buftarg *target = xfs_inode_buftarg(ip); + unsigned int flags = 0; /* DIO must be aligned to device logical sector size */ if ((iocb->ki_pos | count) & target->bt_logical_sectormask) @@ -546,9 +552,10 @@ xfs_file_dio_aio_write( * If unaligned, this is the only IO in-flight. Wait on it before we * release the iolock to prevent subsequent overlapping IO. */ + if (is_sync_kiocb(iocb) || unaligned_io) + flags |= IOMAP_DIO_RWF_SYNCIO; ret = iomap_dio_rw(iocb, from, &xfs_direct_write_iomap_ops, - &xfs_dio_write_ops, - is_sync_kiocb(iocb) || unaligned_io); + &xfs_dio_write_ops, flags); out: xfs_iunlock(ip, iolock); diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c index 07bc42d62673..798e2e636887 100644 --- a/fs/zonefs/super.c +++ b/fs/zonefs/super.c @@ -670,6 +670,7 @@ static ssize_t zonefs_file_dio_write(struct kiocb *iocb, struct iov_iter *from) bool append = false; size_t count; ssize_t ret; + int flags = 0; /* * For async direct IOs to sequential zone files, refuse IOCB_NOWAIT @@ -711,11 +712,15 @@ static ssize_t zonefs_file_dio_write(struct kiocb *iocb, struct iov_iter *from) append = sync; } - if (append) + if (append) { ret = zonefs_file_dio_append(iocb, from); - else + } else { + if (is_sync_kiocb(iocb)) + flags |= IOMAP_DIO_RWF_SYNCIO; + ret = iomap_dio_rw(iocb, from, &zonefs_iomap_ops, - &zonefs_write_dio_ops, sync); + &zonefs_write_dio_ops, flags); + } if (zi->i_ztype == ZONEFS_ZTYPE_SEQ && (ret > 0 || ret == -EIOCBQUEUED)) { if (ret > 0) @@ -814,6 +819,7 @@ static ssize_t zonefs_file_read_iter(struct kiocb *iocb, struct iov_iter *to) struct super_block *sb = inode->i_sb; loff_t isize; ssize_t ret; + int flags = 0; /* Offline zones cannot be read */ if (unlikely(IS_IMMUTABLE(inode) && !(inode->i_mode & 0777))) @@ -848,8 +854,10 @@ static ssize_t zonefs_file_read_iter(struct kiocb *iocb, struct iov_iter *to) goto inode_unlock; } file_accessed(iocb->ki_filp); + if (is_sync_kiocb(iocb)) + flags |= IOMAP_DIO_RWF_SYNCIO; ret = iomap_dio_rw(iocb, to, &zonefs_iomap_ops, - &zonefs_read_dio_ops, is_sync_kiocb(iocb)); + &zonefs_read_dio_ops, flags); } else { ret = generic_file_read_iter(iocb, to); if (ret == -EIO) diff --git a/include/linux/iomap.h b/include/linux/iomap.h index 4d1d3c3469e9..80cd5f524124 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -255,9 +255,18 @@ struct iomap_dio_ops { struct bio *bio, loff_t file_offset); }; +/* + * Flags to pass iomap_dio_rw() + */ + +/* + * Wait for completion of DIO + */ +#define IOMAP_DIO_RWF_SYNCIO (1 << 0) + ssize_t iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter, const struct iomap_ops *ops, const struct iomap_dio_ops *dops, - bool wait_for_completion); + unsigned int flags); int iomap_dio_iopoll(struct kiocb *kiocb, bool spin); #ifdef CONFIG_SWAP From patchwork Wed Jul 8 21:19:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Goldwyn Rodrigues X-Patchwork-Id: 11652649 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 64E9860D for ; Wed, 8 Jul 2020 21:19:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 58712206E2 for ; Wed, 8 Jul 2020 21:19:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726286AbgGHVTv (ORCPT ); Wed, 8 Jul 2020 17:19:51 -0400 Received: from mx2.suse.de ([195.135.220.15]:35436 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725903AbgGHVTu (ORCPT ); Wed, 8 Jul 2020 17:19:50 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id A659EAC91; Wed, 8 Jul 2020 21:19:49 +0000 (UTC) From: Goldwyn Rodrigues To: linux-btrfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, darrick.wong@oracle.com, hch@lst.de, cluster-devel@redhat.com, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, Goldwyn Rodrigues Subject: [PATCH 2/6] iomap: IOMAP_DIO_RWF_NO_STALE_PAGECACHE return if page invalidation fails Date: Wed, 8 Jul 2020 16:19:22 -0500 Message-Id: <20200708211926.7706-3-rgoldwyn@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200708211926.7706-1-rgoldwyn@suse.de> References: <20200708211926.7706-1-rgoldwyn@suse.de> MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: Goldwyn Rodrigues For direct I/O, add the flag IOMAP_DIO_RWF_NO_STALE_PAGECACHE to indicate that if the page invalidation fails, return back control to the filesystem so it may fallback to buffered mode. Reviewed-by: Darrick J. Wong Signed-off-by: Goldwyn Rodrigues --- fs/iomap/direct-io.c | 8 +++++++- include/linux/iomap.h | 14 ++++++++++++++ 2 files changed, 21 insertions(+), 1 deletion(-) diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c index 2753b7022403..66becf935865 100644 --- a/fs/iomap/direct-io.c +++ b/fs/iomap/direct-io.c @@ -484,8 +484,14 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter, */ ret = invalidate_inode_pages2_range(mapping, pos >> PAGE_SHIFT, end >> PAGE_SHIFT); - if (ret) + if (ret) { + if (dio_flags & IOMAP_DIO_RWF_NO_STALE_PAGECACHE) { + if (ret == -EBUSY) + ret = 0; + goto out_free_dio; + } dio_warn_stale_pagecache(iocb->ki_filp); + } ret = 0; if (iov_iter_rw(iter) == WRITE && !wait_for_completion && diff --git a/include/linux/iomap.h b/include/linux/iomap.h index 80cd5f524124..a68705369a2c 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -262,7 +262,21 @@ struct iomap_dio_ops { /* * Wait for completion of DIO */ + #define IOMAP_DIO_RWF_SYNCIO (1 << 0) +/* + * Direct IO will attempt to keep the page cache coherent by + * invalidating the inode's page cache over the range of the DIO. + * That can fail if something else is actively using the page cache. + * If this happens and the DIO continues, the data in the page + * cache will become stale. + * + * Set this flag if you want the DIO to abort without issuing any IO + * or error if it fails to invalidate the page cache successfully. + * This allows the IO submitter to fallback to buffered IO to resubmit + * IO + */ +#define IOMAP_DIO_RWF_NO_STALE_PAGECACHE (1 << 1) ssize_t iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter, const struct iomap_ops *ops, const struct iomap_dio_ops *dops, From patchwork Wed Jul 8 21:19:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Goldwyn Rodrigues X-Patchwork-Id: 11652655 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 D01D213BD for ; Wed, 8 Jul 2020 21:19:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C2DEA20772 for ; Wed, 8 Jul 2020 21:19:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726302AbgGHVTz (ORCPT ); Wed, 8 Jul 2020 17:19:55 -0400 Received: from mx2.suse.de ([195.135.220.15]:35462 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725903AbgGHVTy (ORCPT ); Wed, 8 Jul 2020 17:19:54 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 91F04AE41; Wed, 8 Jul 2020 21:19:52 +0000 (UTC) From: Goldwyn Rodrigues To: linux-btrfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, darrick.wong@oracle.com, hch@lst.de, cluster-devel@redhat.com, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, Goldwyn Rodrigues Subject: [PATCH 3/6] btrfs: switch to iomap_dio_rw() for dio Date: Wed, 8 Jul 2020 16:19:23 -0500 Message-Id: <20200708211926.7706-4-rgoldwyn@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200708211926.7706-1-rgoldwyn@suse.de> References: <20200708211926.7706-1-rgoldwyn@suse.de> MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: Goldwyn Rodrigues Switch from __blockdev_direct_IO() to iomap_dio_rw(). Rename btrfs_get_blocks_direct() to btrfs_dio_iomap_begin() and use it as iomap_begin() for iomap direct I/O functions. This function allocates and locks all the blocks required for the I/O. btrfs_submit_direct() is used as the submit_io() hook for direct I/O ops. Since we need direct I/O reads to go through iomap_dio_rw(), we change file_operations.read_iter() to a btrfs_file_read_iter() which calls btrfs_direct_IO() for direct reads and falls back to generic_file_buffered_read() for incomplete reads and buffered reads. We don't need address_space.direct_IO() anymore so set it to noop. Similarly, we don't need flags used in __blockdev_direct_IO(). iomap is capable of direct I/O reads from a hole, so we don't need to return -ENOENT. BTRFS direct I/O is now done under i_rwsem, shared in case of reads and exclusive in case of writes. This guards against simultaneous truncates. Use iomap->iomap_end() to check for failed or incomplete direct I/O: - for writes, call __endio_write_update_ordered() - for reads, unlock extents btrfs_dio_data is now hooked in iomap->private and not current->journal_info. It carries the reservation variable and the amount of data submitted, so we can calculate the amount of data to call __endio_write_update_ordered in case of an error. This patch removes last use of struct buffer_head from btrfs. Signed-off-by: Goldwyn Rodrigues --- fs/btrfs/Kconfig | 1 + fs/btrfs/ctree.h | 1 + fs/btrfs/file.c | 21 +++- fs/btrfs/inode.c | 317 ++++++++++++++++++++++------------------------- 4 files changed, 170 insertions(+), 170 deletions(-) diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig index 575636f6491e..68b95ad82126 100644 --- a/fs/btrfs/Kconfig +++ b/fs/btrfs/Kconfig @@ -14,6 +14,7 @@ config BTRFS_FS select LZO_DECOMPRESS select ZSTD_COMPRESS select ZSTD_DECOMPRESS + select FS_IOMAP select RAID6_PQ select XOR_BLOCKS select SRCU diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index d404cce8ae40..677f170434e3 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -2935,6 +2935,7 @@ int btrfs_writepage_cow_fixup(struct page *page, u64 start, u64 end); void btrfs_writepage_endio_finish_ordered(struct page *page, u64 start, u64 end, int uptodate); extern const struct dentry_operations btrfs_dentry_operations; +ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter); /* ioctl.c */ long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 2520605afc25..9d486350f1bf 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1835,7 +1835,7 @@ static ssize_t __btrfs_direct_write(struct kiocb *iocb, struct iov_iter *from) loff_t endbyte; int err; - written = generic_file_direct_write(iocb, from); + written = btrfs_direct_IO(iocb, from); if (written < 0 || !iov_iter_count(from)) return written; @@ -3504,9 +3504,26 @@ static int btrfs_file_open(struct inode *inode, struct file *filp) return generic_file_open(inode, filp); } +static ssize_t btrfs_file_read_iter(struct kiocb *iocb, struct iov_iter *to) +{ + ssize_t ret = 0; + + if (iocb->ki_flags & IOCB_DIRECT) { + struct inode *inode = file_inode(iocb->ki_filp); + + inode_lock_shared(inode); + ret = btrfs_direct_IO(iocb, to); + inode_unlock_shared(inode); + if (ret < 0) + return ret; + } + + return generic_file_buffered_read(iocb, to, ret); +} + const struct file_operations btrfs_file_operations = { .llseek = btrfs_file_llseek, - .read_iter = generic_file_read_iter, + .read_iter = btrfs_file_read_iter, .splice_read = generic_file_splice_read, .write_iter = btrfs_file_write_iter, .mmap = btrfs_file_mmap, diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 18d384f4af54..0fa75af35a1f 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -5,7 +5,6 @@ #include #include -#include #include #include #include @@ -30,6 +29,7 @@ #include #include #include +#include #include #include "misc.h" #include "ctree.h" @@ -58,9 +58,9 @@ struct btrfs_iget_args { struct btrfs_dio_data { u64 reserve; - u64 unsubmitted_oe_range_start; - u64 unsubmitted_oe_range_end; - int overwrite; + loff_t length; + ssize_t submitted; + struct extent_changeset *data_reserved; }; static const struct inode_operations btrfs_dir_inode_operations; @@ -7069,7 +7069,7 @@ noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len, } static int lock_extent_direct(struct inode *inode, u64 lockstart, u64 lockend, - struct extent_state **cached_state, int writing) + struct extent_state **cached_state, bool writing) { struct btrfs_ordered_extent *ordered; int ret = 0; @@ -7207,30 +7207,7 @@ static struct extent_map *create_io_em(struct inode *inode, u64 start, u64 len, } -static int btrfs_get_blocks_direct_read(struct extent_map *em, - struct buffer_head *bh_result, - struct inode *inode, - u64 start, u64 len) -{ - struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); - - if (em->block_start == EXTENT_MAP_HOLE || - test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) - return -ENOENT; - - len = min(len, em->len - (start - em->start)); - - bh_result->b_blocknr = (em->block_start + (start - em->start)) >> - inode->i_blkbits; - bh_result->b_size = len; - bh_result->b_bdev = fs_info->fs_devices->latest_bdev; - set_buffer_mapped(bh_result); - - return 0; -} - static int btrfs_get_blocks_direct_write(struct extent_map **map, - struct buffer_head *bh_result, struct inode *inode, struct btrfs_dio_data *dio_data, u64 start, u64 len) @@ -7292,7 +7269,6 @@ static int btrfs_get_blocks_direct_write(struct extent_map **map, } /* this will cow the extent */ - len = bh_result->b_size; free_extent_map(em); *map = em = btrfs_new_extent_direct(inode, start, len); if (IS_ERR(em)) { @@ -7303,64 +7279,73 @@ static int btrfs_get_blocks_direct_write(struct extent_map **map, len = min(len, em->len - (start - em->start)); skip_cow: - bh_result->b_blocknr = (em->block_start + (start - em->start)) >> - inode->i_blkbits; - bh_result->b_size = len; - bh_result->b_bdev = fs_info->fs_devices->latest_bdev; - set_buffer_mapped(bh_result); - - if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) - set_buffer_new(bh_result); - /* * Need to update the i_size under the extent lock so buffered * readers will get the updated i_size when we unlock. */ - if (!dio_data->overwrite && start + len > i_size_read(inode)) + if (start + len > i_size_read(inode)) i_size_write(inode, start + len); - WARN_ON(dio_data->reserve < len); dio_data->reserve -= len; - dio_data->unsubmitted_oe_range_end = start + len; - current->journal_info = dio_data; out: return ret; } -static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock, - struct buffer_head *bh_result, int create) +static int btrfs_dio_iomap_begin(struct inode *inode, loff_t start, + loff_t length, unsigned int flags, struct iomap *iomap, + struct iomap *srcmap) { struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); struct extent_map *em; struct extent_state *cached_state = NULL; struct btrfs_dio_data *dio_data = NULL; - u64 start = iblock << inode->i_blkbits; u64 lockstart, lockend; - u64 len = bh_result->b_size; + const bool write = !!(flags & IOMAP_WRITE); int ret = 0; + u64 len = length; + bool unlock_extents = false; - if (!create) + if (!write) len = min_t(u64, len, fs_info->sectorsize); lockstart = start; lockend = start + len - 1; - if (current->journal_info) { - /* - * Need to pull our outstanding extents and set journal_info to NULL so - * that anything that needs to check if there's a transaction doesn't get - * confused. - */ - dio_data = current->journal_info; - current->journal_info = NULL; + /* + * The generic stuff only does filemap_write_and_wait_range, which + * isn't enough if we've written compressed pages to this area, so we + * need to flush the dirty pages again to make absolutely sure that any + * outstanding dirty pages are on disk. + */ + if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, + &BTRFS_I(inode)->runtime_flags)) + ret = filemap_fdatawrite_range(inode->i_mapping, start, + start + length - 1); + + dio_data = kzalloc(sizeof(*dio_data), GFP_NOFS); + if (!dio_data) + return -ENOMEM; + + dio_data->length = length; + if (write) { + dio_data->reserve = round_up(length, fs_info->sectorsize); + ret = btrfs_delalloc_reserve_space(inode, + &dio_data->data_reserved, + start, dio_data->reserve); + if (ret) { + extent_changeset_free(dio_data->data_reserved); + kfree(dio_data); + return ret; + } } + iomap->private = dio_data; + /* * If this errors out it's because we couldn't invalidate pagecache for * this range and we need to fallback to buffered. */ - if (lock_extent_direct(inode, lockstart, lockend, &cached_state, - create)) { + if (lock_extent_direct(inode, lockstart, lockend, &cached_state, write)) { ret = -ENOTBLK; goto err; } @@ -7392,36 +7377,48 @@ static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock, goto unlock_err; } - if (create) { - ret = btrfs_get_blocks_direct_write(&em, bh_result, inode, - dio_data, start, len); + len = min(len, em->len - (start - em->start)); + if (write) { + ret = btrfs_get_blocks_direct_write(&em, inode, dio_data, + start, len); if (ret < 0) goto unlock_err; - - unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, - lockend, &cached_state); + unlock_extents = true; + /* Recalc len in case the new em is smaller than requested */ + len = min(len, em->len - (start - em->start)); } else { - ret = btrfs_get_blocks_direct_read(em, bh_result, inode, - start, len); - /* Can be negative only if we read from a hole */ - if (ret < 0) { - ret = 0; - free_extent_map(em); - goto unlock_err; - } /* * We need to unlock only the end area that we aren't using. * The rest is going to be unlocked by the endio routine. */ - lockstart = start + bh_result->b_size; - if (lockstart < lockend) { - unlock_extent_cached(&BTRFS_I(inode)->io_tree, - lockstart, lockend, &cached_state); - } else { - free_extent_state(cached_state); - } + lockstart = start + len; + if (lockstart < lockend) + unlock_extents = true; } + if (unlock_extents) + unlock_extent_cached(&BTRFS_I(inode)->io_tree, + lockstart, lockend, &cached_state); + else + free_extent_state(cached_state); + + /* + * Translate extent map information to iomap. + * We trim the extents (and move the addr) even though iomap code does + * that, since we have locked only the parts we are performing I/O in. + */ + if ((em->block_start == EXTENT_MAP_HOLE) || + (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) && !write)) { + iomap->addr = IOMAP_NULL_ADDR; + iomap->type = IOMAP_HOLE; + } else { + iomap->addr = em->block_start + (start - em->start); + iomap->type = IOMAP_MAPPED; + } + iomap->offset = start; + iomap->bdev = fs_info->fs_devices->latest_bdev; + iomap->length = len; + free_extent_map(em); return 0; @@ -7430,8 +7427,53 @@ static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock, unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, &cached_state); err: - if (dio_data) - current->journal_info = dio_data; + if (dio_data) { + btrfs_delalloc_release_space(inode, dio_data->data_reserved, + start, dio_data->reserve, true); + btrfs_delalloc_release_extents(BTRFS_I(inode), dio_data->reserve); + extent_changeset_free(dio_data->data_reserved); + kfree(dio_data); + } + return ret; +} + +static int btrfs_dio_iomap_end(struct inode *inode, loff_t pos, loff_t length, + ssize_t written, unsigned int flags, struct iomap *iomap) +{ + int ret = 0; + struct btrfs_dio_data *dio_data = iomap->private; + size_t submitted = dio_data->submitted; + const bool write = !!(flags & IOMAP_WRITE); + + if (!write && (iomap->type == IOMAP_HOLE)) { + /* If reading from a hole, unlock and return */ + unlock_extent(&BTRFS_I(inode)->io_tree, pos, pos + length - 1); + goto out; + } + + if (submitted < length) { + pos += submitted; + length -= submitted; + if (write) + __endio_write_update_ordered(inode, pos, length, false); + else + unlock_extent(&BTRFS_I(inode)->io_tree, pos, + pos + length - 1); + ret = -ENOTBLK; + } + + if (write) { + if (dio_data->reserve) + btrfs_delalloc_release_space(inode, + dio_data->data_reserved, pos, + dio_data->reserve, true); + btrfs_delalloc_release_extents(BTRFS_I(inode), dio_data->length); + extent_changeset_free(dio_data->data_reserved); + } +out: + kfree(dio_data); + iomap->private = NULL; + return ret; } @@ -7454,7 +7496,7 @@ static void btrfs_dio_private_put(struct btrfs_dio_private *dip) dip->logical_offset + dip->bytes - 1); } - dio_end_io(dip->dio_bio); + bio_endio(dip->dio_bio); kfree(dip); } @@ -7690,24 +7732,11 @@ static struct btrfs_dio_private *btrfs_create_dio_private(struct bio *dio_bio, dip->disk_bytenr = (u64)dio_bio->bi_iter.bi_sector << 9; dip->dio_bio = dio_bio; refcount_set(&dip->refs, 1); - - if (write) { - struct btrfs_dio_data *dio_data = current->journal_info; - - /* - * Setting range start and end to the same value means that - * no cleanup will happen in btrfs_direct_IO - */ - dio_data->unsubmitted_oe_range_end = dip->logical_offset + - dip->bytes; - dio_data->unsubmitted_oe_range_start = - dio_data->unsubmitted_oe_range_end; - } return dip; } -static void btrfs_submit_direct(struct bio *dio_bio, struct inode *inode, - loff_t file_offset) +static blk_qc_t btrfs_submit_direct(struct inode *inode, struct iomap *iomap, + struct bio *dio_bio, loff_t file_offset) { const bool write = (bio_op(dio_bio) == REQ_OP_WRITE); const bool csum = !(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM); @@ -7724,6 +7753,7 @@ static void btrfs_submit_direct(struct bio *dio_bio, struct inode *inode, int ret; blk_status_t status; struct btrfs_io_geometry geom; + struct btrfs_dio_data *dio_data = iomap->private; dip = btrfs_create_dio_private(dio_bio, inode, file_offset); if (!dip) { @@ -7732,8 +7762,8 @@ static void btrfs_submit_direct(struct bio *dio_bio, struct inode *inode, file_offset + dio_bio->bi_iter.bi_size - 1); } dio_bio->bi_status = BLK_STS_RESOURCE; - dio_end_io(dio_bio); - return; + bio_endio(dio_bio); + return BLK_QC_T_NONE; } if (!write && csum) { @@ -7804,15 +7834,17 @@ static void btrfs_submit_direct(struct bio *dio_bio, struct inode *inode, goto out_err; } + dio_data->submitted += clone_len; clone_offset += clone_len; start_sector += clone_len >> 9; file_offset += clone_len; } while (submit_len > 0); - return; + return BLK_QC_T_NONE; out_err: dip->dio_bio->bi_status = status; btrfs_dio_private_put(dip); + return BLK_QC_T_NONE; } static ssize_t check_direct_IO(struct btrfs_fs_info *fs_info, @@ -7848,37 +7880,31 @@ static ssize_t check_direct_IO(struct btrfs_fs_info *fs_info, return retval; } -static ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) +static const struct iomap_ops btrfs_dio_iomap_ops = { + .iomap_begin = btrfs_dio_iomap_begin, + .iomap_end = btrfs_dio_iomap_end, +}; + +static const struct iomap_dio_ops btrfs_dops = { + .submit_io = btrfs_submit_direct, +}; + +ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) { struct file *file = iocb->ki_filp; struct inode *inode = file->f_mapping->host; struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); - struct btrfs_dio_data dio_data = { 0 }; struct extent_changeset *data_reserved = NULL; loff_t offset = iocb->ki_pos; size_t count = 0; - int flags = 0; - bool wakeup = true; bool relock = false; ssize_t ret; + int flags = IOMAP_DIO_RWF_NO_STALE_PAGECACHE; if (check_direct_IO(fs_info, iter, offset)) return 0; - inode_dio_begin(inode); - - /* - * The generic stuff only does filemap_write_and_wait_range, which - * isn't enough if we've written compressed pages to this area, so - * we need to flush the dirty pages again to make absolutely sure - * that any outstanding dirty pages are on disk. - */ count = iov_iter_count(iter); - if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, - &BTRFS_I(inode)->runtime_flags)) - filemap_fdatawrite_range(inode->i_mapping, offset, - offset + count - 1); - if (iov_iter_rw(iter) == WRITE) { /* * If the write DIO is beyond the EOF, we need update @@ -7886,68 +7912,23 @@ static ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) * not unlock the i_mutex at this case. */ if (offset + count <= inode->i_size) { - dio_data.overwrite = 1; inode_unlock(inode); relock = true; } - ret = btrfs_delalloc_reserve_space(inode, &data_reserved, - offset, count); - if (ret) - goto out; - - /* - * We need to know how many extents we reserved so that we can - * do the accounting properly if we go over the number we - * originally calculated. Abuse current->journal_info for this. - */ - dio_data.reserve = round_up(count, - fs_info->sectorsize); - dio_data.unsubmitted_oe_range_start = (u64)offset; - dio_data.unsubmitted_oe_range_end = (u64)offset; - current->journal_info = &dio_data; down_read(&BTRFS_I(inode)->dio_sem); - } else if (test_bit(BTRFS_INODE_READDIO_NEED_LOCK, - &BTRFS_I(inode)->runtime_flags)) { - inode_dio_end(inode); - flags = DIO_LOCKING | DIO_SKIP_HOLES; - wakeup = false; } - ret = __blockdev_direct_IO(iocb, inode, - fs_info->fs_devices->latest_bdev, - iter, btrfs_get_blocks_direct, NULL, - btrfs_submit_direct, flags); + if (is_sync_kiocb(iocb)) + flags |= IOMAP_DIO_RWF_SYNCIO; + + ret = iomap_dio_rw(iocb, iter, &btrfs_dio_iomap_ops, &btrfs_dops, + flags); + if (iov_iter_rw(iter) == WRITE) { up_read(&BTRFS_I(inode)->dio_sem); - current->journal_info = NULL; - if (ret < 0 && ret != -EIOCBQUEUED) { - if (dio_data.reserve) - btrfs_delalloc_release_space(inode, data_reserved, - offset, dio_data.reserve, true); - /* - * On error we might have left some ordered extents - * without submitting corresponding bios for them, so - * cleanup them up to avoid other tasks getting them - * and waiting for them to complete forever. - */ - if (dio_data.unsubmitted_oe_range_start < - dio_data.unsubmitted_oe_range_end) - __endio_write_update_ordered(inode, - dio_data.unsubmitted_oe_range_start, - dio_data.unsubmitted_oe_range_end - - dio_data.unsubmitted_oe_range_start, - false); - } else if (ret >= 0 && (size_t)ret < count) - btrfs_delalloc_release_space(inode, data_reserved, - offset, count - (size_t)ret, true); - btrfs_delalloc_release_extents(BTRFS_I(inode), count); } -out: - if (wakeup) - inode_dio_end(inode); if (relock) inode_lock(inode); - extent_changeset_free(data_reserved); return ret; } @@ -10246,7 +10227,7 @@ static const struct address_space_operations btrfs_aops = { .writepage = btrfs_writepage, .writepages = btrfs_writepages, .readahead = btrfs_readahead, - .direct_IO = btrfs_direct_IO, + .direct_IO = noop_direct_IO, .invalidatepage = btrfs_invalidatepage, .releasepage = btrfs_releasepage, #ifdef CONFIG_MIGRATION From patchwork Wed Jul 8 21:19:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Goldwyn Rodrigues X-Patchwork-Id: 11652661 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 B5E7F913 for ; Wed, 8 Jul 2020 21:20:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A08EA206E9 for ; Wed, 8 Jul 2020 21:20:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726319AbgGHVUA (ORCPT ); Wed, 8 Jul 2020 17:20:00 -0400 Received: from mx2.suse.de ([195.135.220.15]:35518 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725903AbgGHVT4 (ORCPT ); Wed, 8 Jul 2020 17:19:56 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 806EDAC91; Wed, 8 Jul 2020 21:19:55 +0000 (UTC) From: Goldwyn Rodrigues To: linux-btrfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, darrick.wong@oracle.com, hch@lst.de, cluster-devel@redhat.com, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, Goldwyn Rodrigues , Nikolay Borisov , Johannes Thumshirn Subject: [PATCH 4/6] fs: remove dio_end_io() Date: Wed, 8 Jul 2020 16:19:24 -0500 Message-Id: <20200708211926.7706-5-rgoldwyn@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200708211926.7706-1-rgoldwyn@suse.de> References: <20200708211926.7706-1-rgoldwyn@suse.de> MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: Goldwyn Rodrigues Since we removed the last user of dio_end_io(), remove the helper function dio_end_io(). Reviewed-by: Nikolay Borisov Reviewed-by: Johannes Thumshirn Reviewed-by: Christoph Hellwig Signed-off-by: Goldwyn Rodrigues --- fs/direct-io.c | 19 ------------------- include/linux/fs.h | 2 -- 2 files changed, 21 deletions(-) diff --git a/fs/direct-io.c b/fs/direct-io.c index 6d5370eac2a8..1543b5af400e 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -386,25 +386,6 @@ static void dio_bio_end_io(struct bio *bio) spin_unlock_irqrestore(&dio->bio_lock, flags); } -/** - * dio_end_io - handle the end io action for the given bio - * @bio: The direct io bio thats being completed - * - * This is meant to be called by any filesystem that uses their own dio_submit_t - * so that the DIO specific endio actions are dealt with after the filesystem - * has done it's completion work. - */ -void dio_end_io(struct bio *bio) -{ - struct dio *dio = bio->bi_private; - - if (dio->is_async) - dio_bio_end_aio(bio); - else - dio_bio_end_io(bio); -} -EXPORT_SYMBOL_GPL(dio_end_io); - static inline void dio_bio_alloc(struct dio *dio, struct dio_submit *sdio, struct block_device *bdev, diff --git a/include/linux/fs.h b/include/linux/fs.h index 3f881a892ea7..9b3f250d634c 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -3202,8 +3202,6 @@ enum { DIO_SKIP_HOLES = 0x02, }; -void dio_end_io(struct bio *bio); - ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode, struct block_device *bdev, struct iov_iter *iter, get_block_t get_block, From patchwork Wed Jul 8 21:19:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Goldwyn Rodrigues X-Patchwork-Id: 11652665 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 25AC160D for ; Wed, 8 Jul 2020 21:20:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0BF4D206E2 for ; Wed, 8 Jul 2020 21:20:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726336AbgGHVUB (ORCPT ); Wed, 8 Jul 2020 17:20:01 -0400 Received: from mx2.suse.de ([195.135.220.15]:35580 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726305AbgGHVUA (ORCPT ); Wed, 8 Jul 2020 17:20:00 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 6092FAD33; Wed, 8 Jul 2020 21:19:58 +0000 (UTC) From: Goldwyn Rodrigues To: linux-btrfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, darrick.wong@oracle.com, hch@lst.de, cluster-devel@redhat.com, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, Goldwyn Rodrigues , Nikolay Borisov , Johannes Thumshirn Subject: [PATCH 5/6] btrfs: remove BTRFS_INODE_READDIO_NEED_LOCK Date: Wed, 8 Jul 2020 16:19:25 -0500 Message-Id: <20200708211926.7706-6-rgoldwyn@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200708211926.7706-1-rgoldwyn@suse.de> References: <20200708211926.7706-1-rgoldwyn@suse.de> MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: Goldwyn Rodrigues Since we now perform direct reads using i_rwsem, we can remove this inode flag used to co-ordinate unlocked reads. The truncate call takes i_rwsem. This means it is correctly synchronized with concurrent direct reads. Reviewed-by: Nikolay Borisov Reviewed-by: Johannes Thumshirn Signed-off-by: Goldwyn Rodrigues --- fs/btrfs/btrfs_inode.h | 18 ------------------ fs/btrfs/inode.c | 3 --- 2 files changed, 21 deletions(-) diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h index e7d709505cb1..aeff56a0e105 100644 --- a/fs/btrfs/btrfs_inode.h +++ b/fs/btrfs/btrfs_inode.h @@ -28,7 +28,6 @@ enum { BTRFS_INODE_NEEDS_FULL_SYNC, BTRFS_INODE_COPY_EVERYTHING, BTRFS_INODE_IN_DELALLOC_LIST, - BTRFS_INODE_READDIO_NEED_LOCK, BTRFS_INODE_HAS_PROPS, BTRFS_INODE_SNAPSHOT_FLUSH, }; @@ -313,23 +312,6 @@ struct btrfs_dio_private { u8 csums[]; }; -/* - * Disable DIO read nolock optimization, so new dio readers will be forced - * to grab i_mutex. It is used to avoid the endless truncate due to - * nonlocked dio read. - */ -static inline void btrfs_inode_block_unlocked_dio(struct btrfs_inode *inode) -{ - set_bit(BTRFS_INODE_READDIO_NEED_LOCK, &inode->runtime_flags); - smp_mb(); -} - -static inline void btrfs_inode_resume_unlocked_dio(struct btrfs_inode *inode) -{ - smp_mb__before_atomic(); - clear_bit(BTRFS_INODE_READDIO_NEED_LOCK, &inode->runtime_flags); -} - /* Array of bytes with variable length, hexadecimal format 0x1234 */ #define CSUM_FMT "0x%*phN" #define CSUM_FMT_VALUE(size, bytes) size, bytes diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 0fa75af35a1f..264b676ebf29 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -4835,10 +4835,7 @@ static int btrfs_setsize(struct inode *inode, struct iattr *attr) truncate_setsize(inode, newsize); - /* Disable nonlocked read DIO to avoid the endless truncate */ - btrfs_inode_block_unlocked_dio(BTRFS_I(inode)); inode_dio_wait(inode); - btrfs_inode_resume_unlocked_dio(BTRFS_I(inode)); ret = btrfs_truncate(inode, newsize == oldsize); if (ret && inode->i_nlink) { From patchwork Wed Jul 8 21:19:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Goldwyn Rodrigues X-Patchwork-Id: 11652673 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 60A54913 for ; Wed, 8 Jul 2020 21:20:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4FA9F206E2 for ; Wed, 8 Jul 2020 21:20:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726345AbgGHVUF (ORCPT ); Wed, 8 Jul 2020 17:20:05 -0400 Received: from mx2.suse.de ([195.135.220.15]:35684 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726305AbgGHVUE (ORCPT ); Wed, 8 Jul 2020 17:20:04 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 641B5AE61; Wed, 8 Jul 2020 21:20:02 +0000 (UTC) From: Goldwyn Rodrigues To: linux-btrfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, darrick.wong@oracle.com, hch@lst.de, cluster-devel@redhat.com, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, Goldwyn Rodrigues Subject: [PATCH 6/6] btrfs: split btrfs_direct_IO to read and write part Date: Wed, 8 Jul 2020 16:19:26 -0500 Message-Id: <20200708211926.7706-7-rgoldwyn@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200708211926.7706-1-rgoldwyn@suse.de> References: <20200708211926.7706-1-rgoldwyn@suse.de> MIME-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org From: Goldwyn Rodrigues The read and write versions don't have anything in common except for the call to iomap_dio_rw. So split this function, and merge each half into its only caller. Originally proposed by Christoph Hellwig Signed-off-by: Goldwyn Rodrigues --- fs/btrfs/ctree.h | 4 +- fs/btrfs/file.c | 95 +++++++++++++++++++++++++++++++++++++++++++----- fs/btrfs/inode.c | 82 +---------------------------------------- 3 files changed, 90 insertions(+), 91 deletions(-) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 677f170434e3..1037969cda63 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -28,6 +28,7 @@ #include #include #include +#include #include "extent-io-tree.h" #include "extent_io.h" #include "extent_map.h" @@ -2935,7 +2936,8 @@ int btrfs_writepage_cow_fixup(struct page *page, u64 start, u64 end); void btrfs_writepage_endio_finish_ordered(struct page *page, u64 start, u64 end, int uptodate); extern const struct dentry_operations btrfs_dentry_operations; -ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter); +extern const struct iomap_ops btrfs_dio_iomap_ops; +extern const struct iomap_dio_ops btrfs_dops; /* ioctl.c */ long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 9d486350f1bf..8c738f8101c4 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1825,21 +1825,65 @@ static noinline ssize_t btrfs_buffered_write(struct kiocb *iocb, return num_written ? num_written : ret; } -static ssize_t __btrfs_direct_write(struct kiocb *iocb, struct iov_iter *from) +static ssize_t check_direct_IO(struct btrfs_fs_info *fs_info, + const struct iov_iter *iter, loff_t offset) +{ + const unsigned int blocksize_mask = fs_info->sectorsize - 1; + + if (offset & blocksize_mask) + return -EINVAL; + + if (iov_iter_alignment(iter) & blocksize_mask) + return -EINVAL; + + return 0; +} + +static ssize_t btrfs_direct_write(struct kiocb *iocb, struct iov_iter *from) { struct file *file = iocb->ki_filp; struct inode *inode = file_inode(file); - loff_t pos; - ssize_t written; + struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); + loff_t pos = iocb->ki_pos; + ssize_t written = 0; ssize_t written_buffered; loff_t endbyte; int err; + size_t count = 0; + bool relock = false; + int flags = IOMAP_DIO_RWF_NO_STALE_PAGECACHE; - written = btrfs_direct_IO(iocb, from); + if (check_direct_IO(fs_info, from, pos)) + goto buffered; + + count = iov_iter_count(from); + /* + * If the write DIO is beyond the EOF, we need update the isize, but it + * is protected by i_mutex. So we can not unlock the i_mutex at this + * case. + */ + if (pos + count <= inode->i_size) { + inode_unlock(inode); + relock = true; + } else if (iocb->ki_flags & IOCB_NOWAIT) { + return -EAGAIN; + } + + if (is_sync_kiocb(iocb)) + flags |= IOMAP_DIO_RWF_SYNCIO; + + down_read(&BTRFS_I(inode)->dio_sem); + written = iomap_dio_rw(iocb, from, &btrfs_dio_iomap_ops, &btrfs_dops, + flags); + up_read(&BTRFS_I(inode)->dio_sem); + + if (relock) + inode_lock(inode); if (written < 0 || !iov_iter_count(from)) return written; +buffered: pos = iocb->ki_pos; written_buffered = btrfs_buffered_write(iocb, from); if (written_buffered < 0) { @@ -1990,7 +2034,7 @@ static ssize_t btrfs_file_write_iter(struct kiocb *iocb, atomic_inc(&BTRFS_I(inode)->sync_writers); if (iocb->ki_flags & IOCB_DIRECT) { - num_written = __btrfs_direct_write(iocb, from); + num_written = btrfs_direct_write(iocb, from); } else { num_written = btrfs_buffered_write(iocb, from); if (num_written > 0) @@ -3504,16 +3548,47 @@ static int btrfs_file_open(struct inode *inode, struct file *filp) return generic_file_open(inode, filp); } +static int check_direct_read(struct btrfs_fs_info *fs_info, + const struct iov_iter *iter, loff_t offset) +{ + int ret; + int i, seg; + + ret = check_direct_IO(fs_info, iter, offset); + if (ret < 0) + return ret; + + for (seg = 0; seg < iter->nr_segs; seg++) + for (i = seg + 1; i < iter->nr_segs; i++) + if (iter->iov[seg].iov_base == iter->iov[i].iov_base) + return -EINVAL; + return 0; +} + +static ssize_t btrfs_direct_read(struct kiocb *iocb, struct iov_iter *to) +{ + struct inode *inode = file_inode(iocb->ki_filp); + ssize_t ret; + int flags = IOMAP_DIO_RWF_NO_STALE_PAGECACHE; + + if (check_direct_read(btrfs_sb(inode->i_sb), to, iocb->ki_pos)) + return 0; + + if (is_sync_kiocb(iocb)) + flags |= IOMAP_DIO_RWF_SYNCIO; + + inode_lock_shared(inode); + ret = iomap_dio_rw(iocb, to, &btrfs_dio_iomap_ops, &btrfs_dops, flags); + inode_unlock_shared(inode); + return ret; +} + static ssize_t btrfs_file_read_iter(struct kiocb *iocb, struct iov_iter *to) { ssize_t ret = 0; if (iocb->ki_flags & IOCB_DIRECT) { - struct inode *inode = file_inode(iocb->ki_filp); - - inode_lock_shared(inode); - ret = btrfs_direct_IO(iocb, to); - inode_unlock_shared(inode); + ret = btrfs_direct_read(iocb, to); if (ret < 0) return ret; } diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 264b676ebf29..864415a17b1f 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -29,7 +29,6 @@ #include #include #include -#include #include #include "misc.h" #include "ctree.h" @@ -7844,92 +7843,15 @@ static blk_qc_t btrfs_submit_direct(struct inode *inode, struct iomap *iomap, return BLK_QC_T_NONE; } -static ssize_t check_direct_IO(struct btrfs_fs_info *fs_info, - const struct iov_iter *iter, loff_t offset) -{ - int seg; - int i; - unsigned int blocksize_mask = fs_info->sectorsize - 1; - ssize_t retval = -EINVAL; - - if (offset & blocksize_mask) - goto out; - - if (iov_iter_alignment(iter) & blocksize_mask) - goto out; - - /* If this is a write we don't need to check anymore */ - if (iov_iter_rw(iter) != READ || !iter_is_iovec(iter)) - return 0; - /* - * Check to make sure we don't have duplicate iov_base's in this - * iovec, if so return EINVAL, otherwise we'll get csum errors - * when reading back. - */ - for (seg = 0; seg < iter->nr_segs; seg++) { - for (i = seg + 1; i < iter->nr_segs; i++) { - if (iter->iov[seg].iov_base == iter->iov[i].iov_base) - goto out; - } - } - retval = 0; -out: - return retval; -} - -static const struct iomap_ops btrfs_dio_iomap_ops = { +const struct iomap_ops btrfs_dio_iomap_ops = { .iomap_begin = btrfs_dio_iomap_begin, .iomap_end = btrfs_dio_iomap_end, }; -static const struct iomap_dio_ops btrfs_dops = { +const struct iomap_dio_ops btrfs_dops = { .submit_io = btrfs_submit_direct, }; -ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) -{ - struct file *file = iocb->ki_filp; - struct inode *inode = file->f_mapping->host; - struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); - struct extent_changeset *data_reserved = NULL; - loff_t offset = iocb->ki_pos; - size_t count = 0; - bool relock = false; - ssize_t ret; - int flags = IOMAP_DIO_RWF_NO_STALE_PAGECACHE; - - if (check_direct_IO(fs_info, iter, offset)) - return 0; - - count = iov_iter_count(iter); - if (iov_iter_rw(iter) == WRITE) { - /* - * If the write DIO is beyond the EOF, we need update - * the isize, but it is protected by i_mutex. So we can - * not unlock the i_mutex at this case. - */ - if (offset + count <= inode->i_size) { - inode_unlock(inode); - relock = true; - } - down_read(&BTRFS_I(inode)->dio_sem); - } - - if (is_sync_kiocb(iocb)) - flags |= IOMAP_DIO_RWF_SYNCIO; - - ret = iomap_dio_rw(iocb, iter, &btrfs_dio_iomap_ops, &btrfs_dops, - flags); - - if (iov_iter_rw(iter) == WRITE) { - up_read(&BTRFS_I(inode)->dio_sem); - } - if (relock) - inode_lock(inode); - extent_changeset_free(data_reserved); - return ret; -} - static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, __u64 start, __u64 len) {