Re: [PATCH] ReiserFS _get_block_create_0 wrong behavior when I/O fails

[fs <fs@ercist.iscas.ac.cn>]

Dear Vladimir Saveliev,
On Wed, 2005-06-15 at 11:41, Vladimir Saveliev wrote:

> > Patch:
> > diff -uNp /tmp/linux-2.6.12-rc6/fs/reiserfs/inode.c /tmp/linux-2.6.12-rc6.new/fs/reiserfs/inode.c
> > --- /tmp/linux-2.6.12-rc6/fs/reiserfs/inode.c	2005-06-06 11:22:29.000000000 -0400
> > +++ /tmp/linux-2.6.12-rc6.new/fs/reiserfs/inode.c	2005-06-15 13:56:45.552564512 -0400
> > @@ -254,6 +254,7 @@ static int _get_block_create_0 (struct i
> >      char * p = NULL;
> >      int chars;
> >      int ret ;
> > +    int result ;
> >      int done = 0 ;
> >      unsigned long offset ;
> >  
> > @@ -262,7 +263,8 @@ static int _get_block_create_0 (struct i
> >  		  (loff_t)block * inode->i_sb->s_blocksize + 1, TYPE_ANY, 3);
> >  
> >  research:
> > -    if (search_for_position_by_key (inode->i_sb, &key, &path) != POSITION_FOUND) {
> > +    result = search_for_position_by_key (inode->i_sb, &key, &path) ;
> > +    if (result != POSITION_FOUND) {
> >  	pathrelse (&path);
> >          if (p)
> >              kunmap(bh_result->b_page) ;
> > @@ -270,7 +272,8 @@ research:
> >  	// That there is some MMAPED data associated with it that is yet to be written to disk.
> >  	if ((args & GET_BLOCK_NO_HOLE) && !PageUptodate(bh_result->b_page) ) {
> >  	    return -ENOENT ;
> > -	}
> > +	}else if (result == IO_ERROR)
> > +		return -EIO ;
> >          return 0 ;
> >      }
> >      
> 
> Your patch is incomplete. There is one more search_for_position_by_key
> at the end of this function. You probably want to check its return value
> also.
I notice there's a comment
	if (search_for_position_by_key (inode->i_sb, &key, &path) !=
POSITION_FOUND)
	    // we read something from tail, even if now we got IO_ERROR <-
Here, can you explain more ?
	    break;