linux-kernel - Re: [PATCH] afs: Fix setting of mtime when creating a file/dir/symlink

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Date:   Wed, 31 May 2023 20:15:33 -0400
From:   Jeffrey E Altman <jaltman@...istor.com>
To:     David Howells <dhowells@...hat.com>,
        Marc Dionne <marc.dionne@...istor.com>
Cc:     linux-afs@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] afs: Fix setting of mtime when creating a
 file/dir/symlink

On 5/31/2023 6:50 PM, David Howells wrote:
>      
> kafs incorrectly passes a zero mtime (ie. 1st Jan 1970) to the server when
> creating a file, dir or symlink because commit 52af7105eceb caused the
> mtime recorded in the afs_operation struct to be passed to the server, but
> didn't modify the afs_mkdir(), afs_create() and afs_symlink() functions to
> set it first.
>
> Those functions were written with the assumption that the mtime would be
> obtained from the server - but that fell foul of malsynchronised clocks, so
> it was decided that the mtime should be set from the client instead.
>
> Fix this by filling in op->mtime before calling the create op.
>
> Fixes: 52af7105eceb ("afs: Set mtime from the client for yfs create operations")
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: Marc Dionne <marc.dionne@...istor.com>
> cc: linux-afs@...ts.infradead.org
> cc: linux-fsdevel@...r.kernel.org
> ---
>   fs/afs/dir.c |    3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/fs/afs/dir.c b/fs/afs/dir.c
> index 4dd97afa536c..5219182e52e1 100644
> --- a/fs/afs/dir.c
> +++ b/fs/afs/dir.c
> @@ -1358,6 +1358,7 @@ static int afs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
>   	op->dentry	= dentry;
>   	op->create.mode	= S_IFDIR | mode;
>   	op->create.reason = afs_edit_dir_for_mkdir;
> +	op->mtime	= current_time(dir);
>   	op->ops		= &afs_mkdir_operation;
>   	return afs_do_sync_operation(op);
>   }
> @@ -1661,6 +1662,7 @@ static int afs_create(struct mnt_idmap *idmap, struct inode *dir,
>   	op->dentry	= dentry;
>   	op->create.mode	= S_IFREG | mode;
>   	op->create.reason = afs_edit_dir_for_create;
> +	op->mtime	= current_time(dir);
>   	op->ops		= &afs_create_operation;
>   	return afs_do_sync_operation(op);
>   
> @@ -1796,6 +1798,7 @@ static int afs_symlink(struct mnt_idmap *idmap, struct inode *dir,
>   	op->ops			= &afs_symlink_operation;
>   	op->create.reason	= afs_edit_dir_for_symlink;
>   	op->create.symlink	= content;
> +	op->mtime		= current_time(dir);
>   	return afs_do_sync_operation(op);
>   
>   error:
>
Reviewed-by: Jeffrey Altman <jaltman@...istor.com>



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