Re: [PATCH] ext4: take i_mutex in ext4_symlink to eliminate a warning from ext4_truncate

[Theodore Ts'o <tytso@mit.edu>]

Ah, now I see.  Thanks for sending the stack trace.  On the failure
path, we're calling the inline function ext4_truncate_filaed_write()
and this is calling ext4_truncate().

But I'm now wondering if we need to take the i_data_sem mutex in
ext4_truncate_failed_write().

Otherwise, couldn't we end up with problems where a failed write calls
ext4_truncate() without i_data_sem(), and that races with something
else --- say, a punch or truncate call to that same inode?

     	      	      	 	       - Ted