FAILED: patch "[PATCH] cifs: add revalidation on FSCTL failure in" failed to apply to 6.18-stable tree

FAILED: patch "[PATCH] cifs: add revalidation on FSCTL failure in" failed to apply to 6.18-stable tree

[gregkh]

The patch below does not apply to the 6.18-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@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.18.y
git checkout FETCH_HEAD
git cherry-pick -x 53676a5e28231186c9f56d87b7998b640699bc15
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026102114-sincere-numerate-a8df@gregkh' --subject-prefix 'PATCH 6.18.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

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

From 53676a5e28231186c9f56d87b7998b640699bc15 Mon Sep 17 00:00:00 2001
From: Frank Sorenson <sorenson@redhat.com>
Date: Sun, 23 Aug 2026 18:26:46 -0500
Subject: [PATCH] cifs: add revalidation on FSCTL failure in
 smb2_duplicate_extents()

smb2_duplicate_extents() has no handling for
FSCTL_DUPLICATE_EXTENTS_TO_FILE failure: when the FSCTL fails, local
inode metadata may be stale from the pre-extension or from concurrent
remote writes, but is never refreshed.

Force revalidation on FSCTL failure and use i_size_read() for the
pre-extension check.

Fixes: cfc63fc8126a ("smb3: fix cached file size problems in duplicate extents (reflink)")
Cc: stable@vger.kernel.org
Signed-off-by: Frank Sorenson <sorenson@redhat.com>
Signed-off-by: Paulo Alcantara <pc@manguebit.org>

diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
index 7d6738ffcb80..bea4876b58cb 100644
--- a/fs/smb/client/smb2ops.c
+++ b/fs/smb/client/smb2ops.c
@@ -2218,7 +2218,7 @@ smb2_duplicate_extents(const unsigned int xid,
 			       trgtfile->fid.volatile_fid, tcon->tid,
 			       tcon->ses->Suid, src_off, dest_off, len);
 	inode = d_inode(trgtfile->dentry);
-	if (inode->i_size < dest_off + len) {
+	if (i_size_read(inode) < dest_off + len) {
 		rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
 		if (rc)
 			goto duplicate_extents_out;
@@ -2235,7 +2235,10 @@ smb2_duplicate_extents(const unsigned int xid,
 	if (ret_data_len > 0)
 		cifs_dbg(FYI, "Non-zero response length in duplicate extents\n");
 
-	if (rc == 0) {
+	if (rc) {
+		CIFS_I(inode)->time = 0; /* force reval */
+		cifs_invalidate_cache(inode, 0);
+	} else {
 		qrc = SMB2_query_info(xid, tcon, trgtfile->fid.persistent_fid,
 				      trgtfile->fid.volatile_fid, &file_inf);
 		spin_lock(&inode->i_lock);

[PATCH 6.18.y 1/2] smb/client: refresh allocation size after duplicate extents

[Sasha Levin]

From: Huiwen He <hehuiwen@kylinos.cn>

[ Upstream commit 5906d0e82e8e07d756f3ed1abfac8f8cea2c20dc ]

FSCTL_DUPLICATE_EXTENTS_TO_FILE changes the target file extents on the
server, but the client does not refresh the target AllocationSize/i_blocks.
Callers can observe or use the wrong st_blocks value immediately after the
clone, before a later attribute revalidation corrects it.

For example, create a reflinked file with a leading hole:

        xfs_io -f -c "pwrite -S 0x61 0 64k" src
        touch dst
        chmod 600 dst
        xfs_io -c "reflink src 0 1m 64k" dst
        mkswap dst
        swapon dst

The file still has a hole after mkswap:

        /mnt/scratch/dst:
          [0..7]:       allocated
          [8..2047]:    hole
          [2048..2175]: allocated

The server also reports only the allocated ranges:

        server dst size=1114112 blocks=144

but the client reported EOF-derived blocks:

        client dst size=1114112 blocks=2176

and swapon succeeded:

        swapon_result=success
        /mnt/scratch/dst 1.1M 0B -1

So EOF-derived i_blocks can let a sparse reflinked file pass the CIFS
swapfile hole check.

Fix this by querying FILE_ALL_INFORMATION on the target handle after a
successful duplicate extents request. Update i_blocks from AllocationSize
and keep the refreshed target inode attributes valid so a following stat
does not immediately revalidate again.

If the query fails, mark the cached inode attributes stale so a later
getattr can refresh them.

This also fixes the xfstests generic/370 regression introduced by the
i_blocks accounting change, as tested on a Samba "vfs objects = btrfs"
share.

Fixes: 99cd0a6eeb6c ("smb/client: do not account EOF extension as allocation")
Signed-off-by: Huiwen He <hehuiwen@kylinos.cn>
Reviewed-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Signed-off-by: Steve French <stfrench@microsoft.com>
Stable-dep-of: 53676a5e2823 ("cifs: add revalidation on FSCTL failure in smb2_duplicate_extents()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/smb/client/cifsfs.c  | 10 +++++++---
 fs/smb/client/smb2ops.c | 30 ++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+), 3 deletions(-)

diff --git a/fs/smb/client/cifsfs.c b/fs/smb/client/cifsfs.c
index f63519a0b1d8e..0429e90dcfd6d 100644
--- a/fs/smb/client/cifsfs.c
+++ b/fs/smb/client/cifsfs.c
@@ -1463,9 +1463,13 @@ static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
 			target_cifsi->netfs.zero_point = new_size;
 	}
 
-	/* force revalidate of size and timestamps of target file now
-	   that target is updated on the server */
-	CIFS_I(target_inode)->time = 0;
+	/*
+	 * On success, duplicate_extents already updated the target inode attrs
+	 * or marked them stale if the refresh failed.  On failure, mark attrs
+	 * stale because EOF may have changed before the clone failed.
+	 */
+	if (rc)
+		CIFS_I(target_inode)->time = 0;
 unlock:
 	/* although unlocking in the reverse order from locking is not
 	   strictly necessary here it is a little cleaner to be consistent */
diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
index 2026e627bc441..c962f22f3655a 100644
--- a/fs/smb/client/smb2ops.c
+++ b/fs/smb/client/smb2ops.c
@@ -2271,10 +2271,14 @@ smb2_duplicate_extents(const unsigned int xid,
 			u64 len, u64 dest_off)
 {
 	int rc;
+	int qrc;
 	unsigned int ret_data_len;
 	struct inode *inode;
+	struct smb2_file_all_info file_inf;
 	struct duplicate_extents_to_file dup_ext_buf;
+	struct timespec64 ts;
 	struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
+	u64 asize;
 
 	/* server fileays advertise duplicate extent support with this flag */
 	if ((le32_to_cpu(tcon->fsAttrInfo.Attributes) &
@@ -2309,6 +2313,32 @@ smb2_duplicate_extents(const unsigned int xid,
 	if (ret_data_len > 0)
 		cifs_dbg(FYI, "Non-zero response length in duplicate extents\n");
 
+	if (rc == 0) {
+		qrc = SMB2_query_info(xid, tcon, trgtfile->fid.persistent_fid,
+				      trgtfile->fid.volatile_fid, &file_inf);
+		spin_lock(&inode->i_lock);
+		if (qrc == 0) {
+			asize = le64_to_cpu(file_inf.AllocationSize);
+			CIFS_I(inode)->time = jiffies;
+			if (file_inf.LastWriteTime) {
+				ts = cifs_NTtimeToUnix(file_inf.LastWriteTime);
+				inode_set_mtime_to_ts(inode, ts);
+			}
+			if (file_inf.ChangeTime) {
+				ts = cifs_NTtimeToUnix(file_inf.ChangeTime);
+				inode_set_ctime_to_ts(inode, ts);
+			}
+			if (file_inf.LastAccessTime) {
+				ts = cifs_NTtimeToUnix(file_inf.LastAccessTime);
+				inode_set_atime_to_ts(inode, ts);
+			}
+			inode->i_blocks = CIFS_INO_BLOCKS(asize);
+		} else {
+			CIFS_I(inode)->time = 0; /* force reval */
+		}
+		spin_unlock(&inode->i_lock);
+	}
+
 duplicate_extents_out:
 	if (rc)
 		trace_smb3_clone_err(xid, srcfile->fid.volatile_fid,
-- 
2.53.0

[PATCH 6.18.y 2/2] cifs: add revalidation on FSCTL failure in smb2_duplicate_extents()

[Sasha Levin]

From: Frank Sorenson <sorenson@redhat.com>

[ Upstream commit 53676a5e28231186c9f56d87b7998b640699bc15 ]

smb2_duplicate_extents() has no handling for
FSCTL_DUPLICATE_EXTENTS_TO_FILE failure: when the FSCTL fails, local
inode metadata may be stale from the pre-extension or from concurrent
remote writes, but is never refreshed.

Force revalidation on FSCTL failure and use i_size_read() for the
pre-extension check.

Fixes: cfc63fc8126a ("smb3: fix cached file size problems in duplicate extents (reflink)")
Cc: stable@vger.kernel.org
Signed-off-by: Frank Sorenson <sorenson@redhat.com>
Signed-off-by: Paulo Alcantara <pc@manguebit.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/smb/client/smb2ops.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
index c962f22f3655a..600ecf4382fa3 100644
--- a/fs/smb/client/smb2ops.c
+++ b/fs/smb/client/smb2ops.c
@@ -2296,7 +2296,7 @@ smb2_duplicate_extents(const unsigned int xid,
 			       trgtfile->fid.volatile_fid, tcon->tid,
 			       tcon->ses->Suid, src_off, dest_off, len);
 	inode = d_inode(trgtfile->dentry);
-	if (inode->i_size < dest_off + len) {
+	if (i_size_read(inode) < dest_off + len) {
 		rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
 		if (rc)
 			goto duplicate_extents_out;
@@ -2313,7 +2313,10 @@ smb2_duplicate_extents(const unsigned int xid,
 	if (ret_data_len > 0)
 		cifs_dbg(FYI, "Non-zero response length in duplicate extents\n");
 
-	if (rc == 0) {
+	if (rc) {
+		CIFS_I(inode)->time = 0; /* force reval */
+		cifs_invalidate_cache(inode, 0);
+	} else {
 		qrc = SMB2_query_info(xid, tcon, trgtfile->fid.persistent_fid,
 				      trgtfile->fid.volatile_fid, &file_inf);
 		spin_lock(&inode->i_lock);
-- 
2.53.0