linux-kernel - [PATCH AUTOSEL 5.15 06/15] ksmbd: set fixed sector size to FS_SECTOR_SIZE

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Date:   Tue, 26 Apr 2022 15:02:05 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Namjae Jeon <linkinjeon@...nel.org>,
        Steve French <stfrench@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>, sfrench@...ba.org,
        hyc.lee@...il.com, linux-cifs@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 06/15] ksmbd: set fixed sector size to FS_SECTOR_SIZE_INFORMATION

From: Namjae Jeon <linkinjeon@...nel.org>

[ Upstream commit 02655a70b7cc0f534531ee65fa72692f4d31a944 ]

Currently ksmbd is using ->f_bsize from vfs_statfs() as sector size.
If fat/exfat is a local share, ->f_bsize is a cluster size that is too
large to be used as a sector size. Sector sizes larger than 4K cause
problem occurs when mounting an iso file through windows client.

The error message can be obtained using Mount-DiskImage command,
 the error is:
"Mount-DiskImage : The sector size of the physical disk on which the
virtual disk resides is not supported."

This patch reports fixed 4KB sector size if ->s_blocksize is bigger
than 4KB.

Signed-off-by: Namjae Jeon <linkinjeon@...nel.org>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/ksmbd/smb2pdu.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index a9fdb47c2791..1ed3046dd5b3 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -11,6 +11,7 @@
 #include <linux/statfs.h>
 #include <linux/ethtool.h>
 #include <linux/falloc.h>
+#include <linux/mount.h>
 
 #include "glob.h"
 #include "smb2pdu.h"
@@ -4997,15 +4998,17 @@ static int smb2_get_info_filesystem(struct ksmbd_work *work,
 	case FS_SECTOR_SIZE_INFORMATION:
 	{
 		struct smb3_fs_ss_info *info;
+		unsigned int sector_size =
+			min_t(unsigned int, path.mnt->mnt_sb->s_blocksize, 4096);
 
 		info = (struct smb3_fs_ss_info *)(rsp->Buffer);
 
-		info->LogicalBytesPerSector = cpu_to_le32(stfs.f_bsize);
+		info->LogicalBytesPerSector = cpu_to_le32(sector_size);
 		info->PhysicalBytesPerSectorForAtomicity =
-				cpu_to_le32(stfs.f_bsize);
-		info->PhysicalBytesPerSectorForPerf = cpu_to_le32(stfs.f_bsize);
+				cpu_to_le32(sector_size);
+		info->PhysicalBytesPerSectorForPerf = cpu_to_le32(sector_size);
 		info->FSEffPhysicalBytesPerSectorForAtomicity =
-				cpu_to_le32(stfs.f_bsize);
+				cpu_to_le32(sector_size);
 		info->Flags = cpu_to_le32(SSINFO_FLAGS_ALIGNED_DEVICE |
 				    SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE);
 		info->ByteOffsetForSectorAlignment = 0;
-- 
2.35.1