Re: [PATCH 13/15] Do not fallback to default_llseek() whenreaddir() uses BKL

[Jan Kara]

On Fri 20-11-09 17:40:43, Jan Blunck wrote:
> Do not use the fallback default_llseek() if the readdir operation of the
> filesystem still uses the big kernel lock. Since llseek() modifies
> file->f_pos of the directory directly it may need locking to not confuse
> readdir which usually uses file->f_pos directly as well. Since the special
> characteristics of the BKL (unlocked on schedule) are not necessary in this
> case, the inode mutex can be used for locking as provided by
> generic_file_llseek(). This is only possible since all filesystems, except
> reiserfs, either use a directory as a flat file or with disk address
> offsets. Reiserfs on the other hand uses a 32bit hash off the filename as
> the offset so generic_file_llseek() can get used as well since the hash is
> always smaller than sb->s_maxbytes (= (512 << 32) - blocksize).
> 
> Signed-off-by: Jan Blunck <jblunck@xxxxxxx>
> ---
>  fs/udf/dir.c              |    1 +
For the UDF part:

  Acked-by: Jan Kara <jack@xxxxxxx>

-- 
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR
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