On Thu, Jul 05, 2007 at 12:17:25AM +0400, Alexey Dobriyan wrote:
> On Wed, Jul 04, 2007 at 09:30:24PM +0200, Borislav Petkov wrote:
> > Fix error handling in ext4_create_journal according to kernel conventions.
>
> > --- linux-2.6.22-rc7/fs/ext4/super.c.orig
> > +++ linux-2.6.22-rc7/fs/ext4/super.c
> > @@ -2150,6 +2150,7 @@
> > unsigned int journal_inum)
> > {
> > journal_t *journal;
> > + int err;
> >
> > if (sb->s_flags & MS_RDONLY) {
> > printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
> > @@ -2157,13 +2158,15 @@
> > return -EROFS;
> > }
> >
> > - if (!(journal = ext4_get_journal(sb, journal_inum)))
> > + journal = ext4_get_journal(sb, journal_inum);
> > + if (!journal)
> > return -EINVAL;
>
> OK.
>
> > printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
> > journal_inum);
> >
> > - if (jbd2_journal_create(journal)) {
> > + err = jbd2_journal_create(journal);
> > + if (err) {
> > printk(KERN_ERR "EXT4-fs: error creating journal.\n");
> > jbd2_journal_destroy(journal);
> > return -EIO;
>
> Original code is fine.
Hmm, ok but this is not the way error handling is done in the rest of ext3/4.
If you look for error variables declarations of type int in super.c, e.g. in
ext4_load_journal(), ext4_clear_journal_err() and ext4_remount() to name a few,
you'll see how the return value of the called function is assigned to the
error variable and then the last is checked in the if-conditional, which is the
usual way error handling is done in the kernel, imho. And my patch addresses
exactly that.
--
Regards/Gruß,
Boris.
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