Differential D27334 Diff 79926 sys/fs/devfs/devfs_devs.c

Changeset View

Standalone View

sys/fs/devfs/devfs_devs.c

	Show First 20 Lines • Show All 476 Lines • ▼ Show 20 Lines
	* Each cdev_priv has an array of pointers to devfs_dirent which is indexed			* Each cdev_priv has an array of pointers to devfs_dirent which is indexed
	* by the mount points dm_idx.			* by the mount points dm_idx.
	* This function extends the array when necessary, taking into account that			* This function extends the array when necessary, taking into account that
	* the default array is 1 element and not malloc'ed.			* the default array is 1 element and not malloc'ed.
	*/			*/
	static void			static void
	devfs_metoo(struct cdev_priv cdp, struct devfs_mount dm)			devfs_metoo(struct cdev_priv cdp, struct devfs_mount dm)
	{			{
	struct devfs_dirent **dep;			struct devfs_dirent dep, olddep;
	int siz;			int siz;

	siz = (dm->dm_idx + 1) * sizeof *dep;			siz = (dm->dm_idx + 1) * sizeof *dep;
	dep = malloc(siz, M_DEVFS2, M_WAITOK \| M_ZERO);			dep = malloc(siz, M_DEVFS2, M_WAITOK \| M_ZERO);
	dev_lock();			dev_lock();
	if (dm->dm_idx <= cdp->cdp_maxdirent) {			if (dm->dm_idx <= cdp->cdp_maxdirent) {
	/* We got raced */			/* We got raced */
	dev_unlock();			dev_unlock();
	free(dep, M_DEVFS2);			free(dep, M_DEVFS2);
	return;			return;
	}			}
	memcpy(dep, cdp->cdp_dirents, (cdp->cdp_maxdirent + 1) * sizeof *dep);			memcpy(dep, cdp->cdp_dirents, (cdp->cdp_maxdirent + 1) * sizeof *dep);
	if (cdp->cdp_maxdirent > 0)			olddep = cdp->cdp_maxdirent > 0 ? cdp->cdp_dirents : NULL;
	free(cdp->cdp_dirents, M_DEVFS2);
	cdp->cdp_dirents = dep;			cdp->cdp_dirents = dep;
	/*			/*
				kibUnsubmitted Done Inline Actions `olddep = cdp->cdp_maxdirent > 0 ? cdp->cdp_dirents : NULL;` kib: `olddep = cdp->cdp_maxdirent > 0 ? cdp->cdp_dirents : NULL;`
	* XXX: if malloc told us how much we actually got this could			* XXX: if malloc told us how much we actually got this could
	* XXX: be optimized.			* XXX: be optimized.
				markjUnsubmitted Not Done Inline Actions BTW, we now have malloc_size() for this, though I'm not sure we want to encourage its use for situations like this. markj: BTW, we now have malloc_size() for this, though I'm not sure we want to encourage its use for…
	*/			*/
	cdp->cdp_maxdirent = dm->dm_idx;			cdp->cdp_maxdirent = dm->dm_idx;
	dev_unlock();			dev_unlock();
				free(olddep, M_DEVFS2);
	}			}

	/*			/*
	* The caller needs to hold the dm for the duration of the call.			* The caller needs to hold the dm for the duration of the call.
	*/			*/
	static int			static int
	devfs_populate_loop(struct devfs_mount *dm, int cleanup)			devfs_populate_loop(struct devfs_mount *dm, int cleanup)
	{			{
	▲ Show 20 Lines • Show All 234 Lines • Show Last 20 Lines