Re: 2.6.19-rc2-mm1

[Jiri Kosina <jikos@jikos.cz>]

On Thu, 19 Oct 2006, Jiri Kosina wrote:

>  void i_size_write(struct inode *inode, loff_t i_size)
>  {
> -	WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
> +	/* calling us without i_mutex is OK when not connected to dentry yet */
> +	if (list_empty(&inode->i_dentry))
> +		WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
>  #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
>  	write_seqcount_begin(&inode->i_size_seqcount);
>  	inode->i_size = i_size;
> diff --git a/fs/namei.c b/fs/namei.c

This if of course bogus, the one below should be better, sorry

[PATCH] Fix spurious warning in i_size_write

i_size_write() can be legitimately called without inode->i_mutex locked.
This is OK in cases when the inode has not been yet linked into
the parent dentry, so no race condition on i_size can occur.

Signed-off-by: Jiri Kosina <jikos@jikos.cz>

--- 

 fs/inode.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/fs/inode.c b/fs/inode.c
index bb88835..11d8794 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1386,7 +1386,9 @@ void __init inode_init(unsigned long mem
 
 void i_size_write(struct inode *inode, loff_t i_size)
 {
-	WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
+	/* calling us without i_mutex is OK when not connected to dentry yet */
+	if (!list_empty(&inode->i_dentry))
+		WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
 #if BITS_PER_LONG==32 && defined(CONFIG_SMP)
 	write_seqcount_begin(&inode->i_size_seqcount);
 	inode->i_size = i_size;

-- 
Jiri Kosina
-
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