linux-kernel - FAILED: Patch "ksmbd: retrieve number of blocks using vfs_getattr in set_file_allocation

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Date: Wed, 27 Mar 2024 08:24:00 -0400
From: Sasha Levin <sashal@...nel.org>
To: stable@...r.kernel.org,
	mmakassikis@...ebox.fr
Cc: Namjae Jeon <linkinjeon@...nel.org>,
	Steve French <stfrench@...rosoft.com>,
	linux-cifs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: FAILED: Patch "ksmbd: retrieve number of blocks using vfs_getattr in set_file_allocation_info" failed to apply to 5.4-stable tree

The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@...r.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

>From 34cd86b6632718b7df3999d96f51e63de41c5e4f Mon Sep 17 00:00:00 2001
From: Marios Makassikis <mmakassikis@...ebox.fr>
Date: Thu, 22 Feb 2024 10:58:21 +0100
Subject: [PATCH] ksmbd: retrieve number of blocks using vfs_getattr in
 set_file_allocation_info

Use vfs_getattr() to retrieve stat information, rather than make
assumptions about how a filesystem fills inode structs.

Cc: stable@...r.kernel.org
Signed-off-by: Marios Makassikis <mmakassikis@...ebox.fr>
Acked-by: Namjae Jeon <linkinjeon@...nel.org>
Signed-off-by: Steve French <stfrench@...rosoft.com>
---
 fs/smb/server/smb2pdu.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
index f6cc5d2730ffb..199c31c275e5b 100644
--- a/fs/smb/server/smb2pdu.c
+++ b/fs/smb/server/smb2pdu.c
@@ -5809,15 +5809,21 @@ static int set_file_allocation_info(struct ksmbd_work *work,
 
 	loff_t alloc_blks;
 	struct inode *inode;
+	struct kstat stat;
 	int rc;
 
 	if (!(fp->daccess & FILE_WRITE_DATA_LE))
 		return -EACCES;
 
+	rc = vfs_getattr(&fp->filp->f_path, &stat, STATX_BASIC_STATS,
+			 AT_STATX_SYNC_AS_STAT);
+	if (rc)
+		return rc;
+
 	alloc_blks = (le64_to_cpu(file_alloc_info->AllocationSize) + 511) >> 9;
 	inode = file_inode(fp->filp);
 
-	if (alloc_blks > inode->i_blocks) {
+	if (alloc_blks > stat.blocks) {
 		smb_break_all_levII_oplock(work, fp, 1);
 		rc = vfs_fallocate(fp->filp, FALLOC_FL_KEEP_SIZE, 0,
 				   alloc_blks * 512);
@@ -5825,7 +5831,7 @@ static int set_file_allocation_info(struct ksmbd_work *work,
 			pr_err("vfs_fallocate is failed : %d\n", rc);
 			return rc;
 		}
-	} else if (alloc_blks < inode->i_blocks) {
+	} else if (alloc_blks < stat.blocks) {
 		loff_t size;
 
 		/*
-- 
2.43.0