From nobody Tue Nov 26 05:35:51 2024 Received: from dggsgout11.his.huawei.com (dggsgout11.his.huawei.com [45.249.212.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 56E71148318; Tue, 22 Oct 2024 03:13:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.51 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729566783; cv=none; b=Ull5qcXfeRkH0X9wgma3A1dAl0QjmM5ysOMwW3VmgHxai638bF0IhqLTGHUbpsBhyxuL2ZPgigKeYimjG5keUtzREWcoykPyM6Er9sPcylkesCUS8+o24RXlXv8fa4LNg8989O1UQ9m0qy9ShYsAzHBYGxDsPzjjo18oVsUdzSc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729566783; c=relaxed/simple; bh=T/gNZrAi+yf3cn2sY8Slhlo+bj7bmazb0AjAtYqV5+g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VVF5hsOMFar+hSWBTPDYwUTrGZSyuPCYdl7pz3EELUmK5U/j39U3VdsCEqlk9frpLjTaEfV4IW9LMcTuAtmWk0nYhmqO/q8rd1XdK0pha9WbBqIAEa1VnaqWXpIvf0hR+6ApWnt7GrHEq0iHXY5uA4U88Fs+Z/43rouNd21BXuU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com; spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=huaweicloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huaweicloud.com Received: from mail.maildlp.com (unknown [172.19.93.142]) by dggsgout11.his.huawei.com (SkyGuard) with ESMTP id 4XXcgD5QN1z4f3jkc; Tue, 22 Oct 2024 11:12:40 +0800 (CST) Received: from mail02.huawei.com (unknown [10.116.40.128]) by mail.maildlp.com (Postfix) with ESMTP id 088B21A018D; Tue, 22 Oct 2024 11:12:53 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.112.188]) by APP4 (Coremail) with SMTP id gCh0CgCXysYlGBdnPSwWEw--.716S10; Tue, 22 Oct 2024 11:12:52 +0800 (CST) From: Zhang Yi To: linux-ext4@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu, adilger.kernel@dilger.ca, jack@suse.cz, ritesh.list@gmail.com, hch@infradead.org, djwong@kernel.org, david@fromorbit.com, zokeefe@google.com, yi.zhang@huawei.com, yi.zhang@huaweicloud.com, chengzhihao1@huawei.com, yukuai3@huawei.com, yangerkun@huawei.com Subject: [PATCH 06/27] ext4: refactor ext4_collapse_range() Date: Tue, 22 Oct 2024 19:10:37 +0800 Message-ID: <20241022111059.2566137-7-yi.zhang@huaweicloud.com> X-Mailer: git-send-email 2.46.1 In-Reply-To: <20241022111059.2566137-1-yi.zhang@huaweicloud.com> References: <20241022111059.2566137-1-yi.zhang@huaweicloud.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: gCh0CgCXysYlGBdnPSwWEw--.716S10 X-Coremail-Antispam: 1UD129KBjvJXoW3Gry8KryxGr4fWrW5Kw18uFg_yoWxJr4fpr ZxWry5Kr40ga4kWr48tF4DZF10y3W0g3yUWrWxGrnYqa4qyrnrKa4YyFyF9Fy8trWkZFWj qF40v34UWrW7Aa7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUQl14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2jI8I6cxK62vIxIIY0VWUZVW8XwA2048vs2IY02 0E87I2jVAFwI0_JF0E3s1l82xGYIkIc2x26xkF7I0E14v26ryj6s0DM28lY4IEw2IIxxk0 rwA2F7IY1VAKz4vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6x IIjxv20xvEc7CjxVAFwI0_Cr1j6rxdM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK 6I8E87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4 xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r106r15McIj6I8E87Iv67AKxVWUJVW8 JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20V AGYxC7M4IIrI8v6xkF7I0E8cxan2IY04v7MxkF7I0En4kS14v26r1q6r43MxAIw28IcxkI 7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxV Cjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVW8ZVWrXwCIc40Y0x0EwIxGrwCI42IY 6xIIjxv20xvE14v26r1I6r4UMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8Jr0_Cr1UMIIF0x vE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv 6xkF7I0E14v26r4UJVWxJrUvcSsGvfC2KfnxnUUI43ZEXa7sRRgAFtUUUUU== X-CM-SenderInfo: d1lo6xhdqjqx5xdzvxpfor3voofrz/ Content-Type: text/plain; charset="utf-8" From: Zhang Yi Simplify ext4_collapse_range() and align its code style with that of ext4_zero_range() and ext4_punch_hole(). Refactor it by: a) renaming variables, b) removing redundant input parameter checks and moving the remaining checks under i_rwsem in preparation for future refactoring, and c) renaming the three stale error tags. Signed-off-by: Zhang Yi --- fs/ext4/extents.c | 103 +++++++++++++++++++++------------------------- 1 file changed, 48 insertions(+), 55 deletions(-) diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index f843342e5164..a4e95f3b5f09 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -5295,43 +5295,36 @@ static int ext4_collapse_range(struct file *file, l= off_t offset, loff_t len) struct inode *inode =3D file_inode(file); struct super_block *sb =3D inode->i_sb; struct address_space *mapping =3D inode->i_mapping; - ext4_lblk_t punch_start, punch_stop; + loff_t end =3D offset + len; + ext4_lblk_t start_lblk, end_lblk; handle_t *handle; unsigned int credits; - loff_t new_size, ioffset; + loff_t start, new_size; int ret; =20 - /* - * We need to test this early because xfstests assumes that a - * collapse range of (0, 1) will return EOPNOTSUPP if the file - * system does not support collapse range. - */ - if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) - return -EOPNOTSUPP; + trace_ext4_collapse_range(inode, offset, len); =20 - /* Collapse range works only on fs cluster size aligned regions. */ - if (!IS_ALIGNED(offset | len, EXT4_CLUSTER_SIZE(sb))) - return -EINVAL; + inode_lock(inode); =20 - trace_ext4_collapse_range(inode, offset, len); + /* Currently just for extent based files */ + if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { + ret =3D -EOPNOTSUPP; + goto out; + } =20 - punch_start =3D offset >> EXT4_BLOCK_SIZE_BITS(sb); - punch_stop =3D (offset + len) >> EXT4_BLOCK_SIZE_BITS(sb); + /* Collapse range works only on fs cluster size aligned regions. */ + if (!IS_ALIGNED(offset | len, EXT4_CLUSTER_SIZE(sb))) { + ret =3D -EINVAL; + goto out; + } =20 - inode_lock(inode); /* * There is no need to overlap collapse range with EOF, in which case * it is effectively a truncate operation */ - if (offset + len >=3D inode->i_size) { + if (end >=3D inode->i_size) { ret =3D -EINVAL; - goto out_mutex; - } - - /* Currently just for extent based files */ - if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { - ret =3D -EOPNOTSUPP; - goto out_mutex; + goto out; } =20 /* Wait for existing dio to complete */ @@ -5339,7 +5332,7 @@ static int ext4_collapse_range(struct file *file, lof= f_t offset, loff_t len) =20 ret =3D file_modified(file); if (ret) - goto out_mutex; + goto out; =20 /* * Prevent page faults from reinstantiating pages we have released from @@ -5349,55 +5342,52 @@ static int ext4_collapse_range(struct file *file, l= off_t offset, loff_t len) =20 ret =3D ext4_break_layouts(inode); if (ret) - goto out_mmap; + goto out_invalidate_lock; =20 /* + * Write tail of the last page before removed range and data that + * will be shifted since they will get removed from the page cache + * below. We are also protected from pages becoming dirty by + * i_rwsem and invalidate_lock. * Need to round down offset to be aligned with page size boundary * for page size > block size. */ - ioffset =3D round_down(offset, PAGE_SIZE); - /* - * Write tail of the last page before removed range since it will get - * removed from the page cache below. - */ - ret =3D filemap_write_and_wait_range(mapping, ioffset, offset); - if (ret) - goto out_mmap; - /* - * Write data that will be shifted to preserve them when discarding - * page cache below. We are also protected from pages becoming dirty - * by i_rwsem and invalidate_lock. - */ - ret =3D filemap_write_and_wait_range(mapping, offset + len, - LLONG_MAX); + start =3D round_down(offset, PAGE_SIZE); + ret =3D filemap_write_and_wait_range(mapping, start, offset); + if (!ret) + ret =3D filemap_write_and_wait_range(mapping, end, LLONG_MAX); if (ret) - goto out_mmap; - truncate_pagecache(inode, ioffset); + goto out_invalidate_lock; + + truncate_pagecache(inode, start); =20 credits =3D ext4_writepage_trans_blocks(inode); handle =3D ext4_journal_start(inode, EXT4_HT_TRUNCATE, credits); if (IS_ERR(handle)) { ret =3D PTR_ERR(handle); - goto out_mmap; + goto out_invalidate_lock; } ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_FALLOC_RANGE, handle); =20 + start_lblk =3D offset >> inode->i_blkbits; + end_lblk =3D (offset + len) >> inode->i_blkbits; + down_write(&EXT4_I(inode)->i_data_sem); ext4_discard_preallocations(inode); - ext4_es_remove_extent(inode, punch_start, EXT_MAX_BLOCKS - punch_start); + ext4_es_remove_extent(inode, start_lblk, EXT_MAX_BLOCKS - start_lblk); =20 - ret =3D ext4_ext_remove_space(inode, punch_start, punch_stop - 1); + ret =3D ext4_ext_remove_space(inode, start_lblk, end_lblk - 1); if (ret) { up_write(&EXT4_I(inode)->i_data_sem); - goto out_stop; + goto out_handle; } ext4_discard_preallocations(inode); =20 - ret =3D ext4_ext_shift_extents(inode, handle, punch_stop, - punch_stop - punch_start, SHIFT_LEFT); + ret =3D ext4_ext_shift_extents(inode, handle, end_lblk, + end_lblk - start_lblk, SHIFT_LEFT); if (ret) { up_write(&EXT4_I(inode)->i_data_sem); - goto out_stop; + goto out_handle; } =20 new_size =3D inode->i_size - len; @@ -5405,16 +5395,19 @@ static int ext4_collapse_range(struct file *file, l= off_t offset, loff_t len) EXT4_I(inode)->i_disksize =3D new_size; =20 up_write(&EXT4_I(inode)->i_data_sem); - if (IS_SYNC(inode)) - ext4_handle_sync(handle); ret =3D ext4_mark_inode_dirty(handle, inode); + if (ret) + goto out_handle; + ext4_update_inode_fsync_trans(handle, inode, 1); + if (IS_SYNC(inode)) + ext4_handle_sync(handle); =20 -out_stop: +out_handle: ext4_journal_stop(handle); -out_mmap: +out_invalidate_lock: filemap_invalidate_unlock(mapping); -out_mutex: +out: inode_unlock(inode); return ret; } --=20 2.46.1