linux-kernel - linux-next: manual merge of the vfs-brauner tree with the overlayfs tree

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Date:   Tue, 26 Sep 2023 10:24:44 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Christian Brauner <brauner@...nel.org>
Cc:     Alessio Balsini <balsini@...roid.com>,
        Amir Goldstein <amir73il@...il.com>,
        Jens Axboe <axboe@...nel.dk>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: linux-next: manual merge of the vfs-brauner tree with the overlayfs
 tree

Hi all,

Today's linux-next merge of the vfs-brauner tree got a conflict in:

  fs/overlayfs/file.c

between commit:

  f8f29a49ec21 ("ovl: move ovl_file_accessed() to aio completion")
  e57757c5d874 ("ovl: use simpler function to convert iocb to rw flags")

from the overlayfs tree and commit:

  2d1b3bbc3dd5 ("ovl: disable IOCB_DIO_CALLER_COMP")

from the vfs-brauner tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc fs/overlayfs/file.c
index 05ec614f7054,693971d20280..000000000000
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@@ -398,16 -389,22 +398,22 @@@ static ssize_t ovl_write_iter(struct ki
  		goto out_fdput;
  
  	if (!ovl_should_sync(OVL_FS(inode->i_sb)))
 -		ifl &= ~(IOCB_DSYNC | IOCB_SYNC);
 +		flags &= ~(IOCB_DSYNC | IOCB_SYNC);
  
+ 	/*
+ 	 * Overlayfs doesn't support deferred completions, don't copy
+ 	 * this property in case it is set by the issuer.
+ 	 */
 -	ifl &= ~IOCB_DIO_CALLER_COMP;
++	flags &= ~IOCB_DIO_CALLER_COMP;
+ 
 -	old_cred = ovl_override_creds(file_inode(file)->i_sb);
 +	old_cred = ovl_override_creds(inode->i_sb);
  	if (is_sync_kiocb(iocb)) {
 +		rwf_t rwf = iocb_to_rw_flags(flags);
 +
  		file_start_write(real.file);
 -		ret = vfs_iter_write(real.file, iter, &iocb->ki_pos,
 -				     ovl_iocb_to_rwf(ifl));
 +		ret = vfs_iter_write(real.file, iter, &iocb->ki_pos, rwf);
  		file_end_write(real.file);
 -		/* Update size */
 -		ovl_copyattr(inode);
 +		ovl_rw_complete(iocb);
  	} else {
  		struct ovl_aio_req *aio_req;
  

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