From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 353D31F130F; Tue, 3 Dec 2024 15:25:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733239513; cv=none; b=tHA3au01WhgpdESDcydks3DPx0Uqv3wbDzw9GJ5+qVf92m/EkPy/dwLVKI9rzsOyJRRhWKr5NC3Ywz7FHOFsoQm67OJp9lnnB8JEMbQMDNktSeccCowL4luTg8FAHOSylenGM7Yk7xLG1mUfNPTvxy72Hb3eXy2SC+7AIc8dwyM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733239513; c=relaxed/simple; bh=eyaH8wYdGIG9NVksKN+r03K70zhu4pq5leNm/D3zb1U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CnJKXYsOi1a+3diA6wK+hC0Awd7/Vj2+e2XsGoZlQxcw3LpsqirhBIsc4kWIF1wHG80CUq3xyZrLnxbrXjt1ksSUYsgw5sf5ekmoXjftpzL/5iHBnDMelPjlwm7RO1Yul3qUsZ3IejJ5yC3tm9WxRvLQR7I7jM4PhVA9W5P72z0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=xYMgxDiN; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="xYMgxDiN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ABA67C4CECF; Tue, 3 Dec 2024 15:25:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1733239513; bh=eyaH8wYdGIG9NVksKN+r03K70zhu4pq5leNm/D3zb1U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xYMgxDiNLpZF6AkC7ZZsio1XtDpGknchGH6/Jy2gJFdghpZnC7u2bGypRW6kJvlm3 Qbg1ivQU9J9+3cW7PhZBT2hS7zVOjkbeYjHiscIo/LC/g0f4WVCLyRsgoWRR/lt1KN BxgtS0vQZz+Nu7AIO7AeHDySr0YIjPf8ABgYGWDM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Theodore Tso Subject: [PATCH 6.11 638/817] ext4: fix FS_IOC_GETFSMAP handling Date: Tue, 3 Dec 2024 15:43:30 +0100 Message-ID: <20241203144020.853556336@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241203143955.605130076@linuxfoundation.org> References: <20241203143955.605130076@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.11-stable review patch. If anyone has any objections, please let me know. ------------------ From: Theodore Ts'o commit 4a622e4d477bb12ad5ed4abbc7ad1365de1fa347 upstream. The original implementation ext4's FS_IOC_GETFSMAP handling only worked when the range of queried blocks included at least one free (unallocated) block range. This is because how the metadata blocks were emitted was as a side effect of ext4_mballoc_query_range() calling ext4_getfsmap_datadev_helper(), and that function was only called when a free block range was identified. As a result, this caused generic/365 to fail. Fix this by creating a new function ext4_getfsmap_meta_helper() which gets called so that blocks before the first free block range in a block group can get properly reported. Signed-off-by: Theodore Ts'o Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- fs/ext4/fsmap.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++++- fs/ext4/mballoc.c | 18 ++++++++++++++---- fs/ext4/mballoc.h | 1 + 3 files changed, 68 insertions(+), 5 deletions(-) --- a/fs/ext4/fsmap.c +++ b/fs/ext4/fsmap.c @@ -185,6 +185,56 @@ static inline ext4_fsblk_t ext4_fsmap_ne return fmr->fmr_physical + fmr->fmr_length; } +static int ext4_getfsmap_meta_helper(struct super_block *sb, + ext4_group_t agno, ext4_grpblk_t start, + ext4_grpblk_t len, void *priv) +{ + struct ext4_getfsmap_info *info = priv; + struct ext4_fsmap *p; + struct ext4_fsmap *tmp; + struct ext4_sb_info *sbi = EXT4_SB(sb); + ext4_fsblk_t fsb, fs_start, fs_end; + int error; + + fs_start = fsb = (EXT4_C2B(sbi, start) + + ext4_group_first_block_no(sb, agno)); + fs_end = fs_start + EXT4_C2B(sbi, len); + + /* Return relevant extents from the meta_list */ + list_for_each_entry_safe(p, tmp, &info->gfi_meta_list, fmr_list) { + if (p->fmr_physical < info->gfi_next_fsblk) { + list_del(&p->fmr_list); + kfree(p); + continue; + } + if (p->fmr_physical <= fs_start || + p->fmr_physical + p->fmr_length <= fs_end) { + /* Emit the retained free extent record if present */ + if (info->gfi_lastfree.fmr_owner) { + error = ext4_getfsmap_helper(sb, info, + &info->gfi_lastfree); + if (error) + return error; + info->gfi_lastfree.fmr_owner = 0; + } + error = ext4_getfsmap_helper(sb, info, p); + if (error) + return error; + fsb = p->fmr_physical + p->fmr_length; + if (info->gfi_next_fsblk < fsb) + info->gfi_next_fsblk = fsb; + list_del(&p->fmr_list); + kfree(p); + continue; + } + } + if (info->gfi_next_fsblk < fsb) + info->gfi_next_fsblk = fsb; + + return 0; +} + + /* Transform a blockgroup's free record into a fsmap */ static int ext4_getfsmap_datadev_helper(struct super_block *sb, ext4_group_t agno, ext4_grpblk_t start, @@ -539,6 +589,7 @@ static int ext4_getfsmap_datadev(struct error = ext4_mballoc_query_range(sb, info->gfi_agno, EXT4_B2C(sbi, info->gfi_low.fmr_physical), EXT4_B2C(sbi, info->gfi_high.fmr_physical), + ext4_getfsmap_meta_helper, ext4_getfsmap_datadev_helper, info); if (error) goto err; @@ -560,7 +611,8 @@ static int ext4_getfsmap_datadev(struct /* Report any gaps at the end of the bg */ info->gfi_last = true; - error = ext4_getfsmap_datadev_helper(sb, end_ag, last_cluster, 0, info); + error = ext4_getfsmap_datadev_helper(sb, end_ag, last_cluster + 1, + 0, info); if (error) goto err; --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -6998,13 +6998,14 @@ int ext4_mballoc_query_range( struct super_block *sb, ext4_group_t group, - ext4_grpblk_t start, + ext4_grpblk_t first, ext4_grpblk_t end, + ext4_mballoc_query_range_fn meta_formatter, ext4_mballoc_query_range_fn formatter, void *priv) { void *bitmap; - ext4_grpblk_t next; + ext4_grpblk_t start, next; struct ext4_buddy e4b; int error; @@ -7015,10 +7016,19 @@ ext4_mballoc_query_range( ext4_lock_group(sb, group); - start = max(e4b.bd_info->bb_first_free, start); + start = max(e4b.bd_info->bb_first_free, first); if (end >= EXT4_CLUSTERS_PER_GROUP(sb)) end = EXT4_CLUSTERS_PER_GROUP(sb) - 1; - + if (meta_formatter && start != first) { + if (start > end) + start = end; + ext4_unlock_group(sb, group); + error = meta_formatter(sb, group, first, start - first, + priv); + if (error) + goto out_unload; + ext4_lock_group(sb, group); + } while (start <= end) { start = mb_find_next_zero_bit(bitmap, end + 1, start); if (start > end) --- a/fs/ext4/mballoc.h +++ b/fs/ext4/mballoc.h @@ -259,6 +259,7 @@ ext4_mballoc_query_range( ext4_group_t agno, ext4_grpblk_t start, ext4_grpblk_t end, + ext4_mballoc_query_range_fn meta_formatter, ext4_mballoc_query_range_fn formatter, void *priv);