This is a note to let you know that I've just added the patch titled
smb3: fix cached file size problems in duplicate extents (reflink)
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
smb3-fix-cached-file-size-problems-in-duplicate-extents-reflink.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From cfc63fc8126a93cbf95379bc4cad79a7b15b6ece Mon Sep 17 00:00:00 2001
From: Steve French <stfrench@xxxxxxxxxxxxx>
Date: Fri, 26 Mar 2021 18:41:55 -0500
Subject: smb3: fix cached file size problems in duplicate extents (reflink)
From: Steve French <stfrench@xxxxxxxxxxxxx>
commit cfc63fc8126a93cbf95379bc4cad79a7b15b6ece upstream.
There were two problems (one of which could cause data corruption)
that were noticed with duplicate extents (ie reflink)
when debugging why various xfstests were being incorrectly skipped
(e.g. generic/138, generic/140, generic/142). First, we were not
updating the file size locally in the cache when extending a
file due to reflink (it would refresh after actimeo expires)
but xfstest was checking the size immediately which was still
0 so caused the test to be skipped. Second, we were setting
the target file size (which could shrink the file) in all cases
to the end of the reflinked range rather than only setting the
target file size when reflink would extend the file.
CC: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/cifs/smb2ops.c | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -1980,6 +1980,7 @@ smb2_duplicate_extents(const unsigned in
{
int rc;
unsigned int ret_data_len;
+ struct inode *inode;
struct duplicate_extents_to_file dup_ext_buf;
struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
@@ -1996,10 +1997,21 @@ smb2_duplicate_extents(const unsigned in
cifs_dbg(FYI, "Duplicate extents: src off %lld dst off %lld len %lld\n",
src_off, dest_off, len);
- rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
- if (rc)
- goto duplicate_extents_out;
+ inode = d_inode(trgtfile->dentry);
+ if (inode->i_size < dest_off + len) {
+ rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
+ if (rc)
+ goto duplicate_extents_out;
+ /*
+ * Although also could set plausible allocation size (i_blocks)
+ * here in addition to setting the file size, in reflink
+ * it is likely that the target file is sparse. Its allocation
+ * size will be queried on next revalidate, but it is important
+ * to make sure that file's cached size is updated immediately
+ */
+ cifs_setsize(inode, dest_off + len);
+ }
rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
trgtfile->fid.volatile_fid,
FSCTL_DUPLICATE_EXTENTS_TO_FILE,
Patches currently in stable-queue which might be from stfrench@xxxxxxxxxxxxx are
queue-5.10/smb3-fix-cached-file-size-problems-in-duplicate-extents-reflink.patch
queue-5.10/cifs-change-noisy-error-message-to-fyi.patch
queue-5.10/cifs-adjust-key-sizes-and-key-generation-routines-for-aes256-encryption.patch
queue-5.10/cifs-ask-for-more-credit-on-async-read-write-code-pa.patch
