On Tue, Nov 23, 2010 at 12:26:31PM +0200, Boaz Harrosh wrote:
> > *
> > * Invoke writeback_inodes_sb if no writeback is currently underway.
> > * Returns 1 if writeback was started, 0 if not.
> > + *
> > + * Even if 1 is returned, writeback may not be started if memory allocation
> > + * fails. This function makes no guarantees about anything.
> > */
> > int writeback_inodes_sb_if_idle(struct super_block *sb)
> > {
> > if (!writeback_in_progress(sb->s_bdi)) {
> > - down_read(&sb->s_umount);
> > - writeback_inodes_sb(sb);
> > - up_read(&sb->s_umount);
> > + bdi_start_writeback(sb->s_bdi, get_nr_dirty_pages());
> > return 1;
> > - } else
> > - return 0;
> > + }
> > + return 0;
> > }
> > EXPORT_SYMBOL(writeback_inodes_sb_if_idle);
> >
> > @@ -1172,17 +1173,18 @@ EXPORT_SYMBOL(writeback_inodes_sb_if_idl
> > *
> > * Invoke writeback_inodes_sb if no writeback is currently underway.
> > * Returns 1 if writeback was started, 0 if not.
> > + *
> > + * Even if 1 is returned, writeback may not be started if memory allocation
> > + * fails. This function makes no guarantees about anything.
> > */
> > int writeback_inodes_sb_nr_if_idle(struct super_block *sb,
> > unsigned long nr)
> > {
> > if (!writeback_in_progress(sb->s_bdi)) {
> > - down_read(&sb->s_umount);
> > - writeback_inodes_sb_nr(sb, nr);
> > - up_read(&sb->s_umount);
> > + bdi_start_writeback(sb->s_bdi, nr);
> > return 1;
> > - } else
> > - return 0;
> > + }
> > + return 0;
> > }
> > EXPORT_SYMBOL(writeback_inodes_sb_nr_if_idle);
> >
>
> static inline int writeback_inodes_sb_if_idle(struct super_block *sb)
> {
> return writeback_inodes_sb_nr_if_idle(sb, get_nr_dirty_pages());
> }
>
> In writeback.h, No?
I didn't care enough to move it :P I don't know if it matters.
> But it has a single user so please just kill it.
>
> Also writeback_inodes_sb_nr_if_idle() has a single user. Combined with above,
> two users. Why not open code it in the two sites. It should be much
> clearer to understand what the magic is all about?
The filesystem shouldn't be aware of the details (the "magic") of how to
kick writeback, so I think the abstraction is right as is.
Thanks,
Nick
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