Messages in this thread | | | Date | Thu, 1 Jun 2006 23:41:58 +0200 | From | Olaf Hering <> | Subject | Re: [PATCH] cramfs corruption after BLKFLSBUF on loop device |
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On Thu, Jun 01, Andrew Morton wrote:
> Olaf Hering <olh@suse.de> wrote: > > > > > > > > +/* return a page in PageUptodate state, BLKFLSBUF may have flushed the page */ > > +static struct page *cramfs_read_cache_page(struct address_space *m, unsigned int n) > > +{ > > + struct page *page; > > + int readagain = 5; > > +retry: > > + page = read_cache_page(m, n, (filler_t *)m->a_ops->readpage, NULL); > > + if (IS_ERR(page)) > > + return NULL; > > + lock_page(page); > > + if (PageUptodate(page)) > > + return page; > > + unlock_page(page); > > + page_cache_release(page); > > + if (readagain--) > > + goto retry; > > + return NULL; > > +} > > Better, but it's still awful, isn't it? The things you were discussing > with Chris look more promising. PG_Dirty would be a bit of a hack, but at > least it'd be a 100% reliable hack, whereas the above is a > whatever-the-previous-failure-rate-was-to-the-fifth hack.
Do you want it like that?
lock_page(page); if (PageUptodate(page)) { SetPageDirty(page); mb(); return page; }
and perhaps a ClearPageDirty() after memcpy. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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