From 53676a5e28231186c9f56d87b7998b640699bc15 Mon Sep 17 00:00:00 2001 From: Frank Sorenson 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 Signed-off-by: Paulo Alcantara --- 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 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);