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Commit de4c455b authored by Boris Brezillon's avatar Boris Brezillon Committed by Richard Weinberger
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UBI: factorize code used to manipulate volumes at attach time 



Volume creation/search code is duplicated in a few places (fastmap and
non fastmap code). Create some helpers to factorize the code.

Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent 5f09aaa9

drivers/mtd/ubi/attach.c

+108 −43
Original line number Diff line number Diff line
@@ -95,6 +95,92 @@ static int self_check_ai(struct ubi_device *ubi, struct ubi_attach_info *ai); 
static struct ubi_ec_hdr *ech;

static struct ubi_vid_hdr *vidh;



#define AV_FIND		BIT(0)

#define AV_ADD		BIT(1)

#define AV_FIND_OR_ADD	(AV_FIND | AV_ADD)



/**

 * find_or_add_av - internal function to find a volume, add a volume or do

 *		    both (find and add if missing).

 * @ai: attaching information

 * @vol_id: the requested volume ID

 * @flags: a combination of the %AV_FIND and %AV_ADD flags describing the

 *	   expected operation. If only %AV_ADD is set, -EEXIST is returned

 *	   if the volume already exists. If only %AV_FIND is set, NULL is

 *	   returned if the volume does not exist. And if both flags are

 *	   set, the helper first tries to find an existing volume, and if

 *	   it does not exist it creates a new one.

 * @created: in value used to inform the caller whether it"s a newly created

 *	     volume or not.

 *

 * This function returns a pointer to a volume description or an ERR_PTR if

 * the operation failed. It can also return NULL if only %AV_FIND is set and

 * the volume does not exist.

 */

static struct ubi_ainf_volume *find_or_add_av(struct ubi_attach_info *ai,

					      int vol_id, unsigned int flags,

					      bool *created)

{

	struct ubi_ainf_volume *av;

	struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;



	/* Walk the volume RB-tree to look if this volume is already present */

	while (*p) {

		parent = *p;

		av = rb_entry(parent, struct ubi_ainf_volume, rb);



		if (vol_id == av->vol_id) {

			*created = false;



			if (!(flags & AV_FIND))

				return ERR_PTR(-EEXIST);



			return av;

		}



		if (vol_id > av->vol_id)

			p = &(*p)->rb_left;

		else

			p = &(*p)->rb_right;

	}



	if (!(flags & AV_ADD))

		return NULL;



	/* The volume is absent - add it */

	av = kzalloc(sizeof(*av), GFP_KERNEL);

	if (!av)

		return ERR_PTR(-ENOMEM);



	av->vol_id = vol_id;



	if (vol_id > ai->highest_vol_id)

		ai->highest_vol_id = vol_id;



	rb_link_node(&av->rb, parent, p);

	rb_insert_color(&av->rb, &ai->volumes);

	ai->vols_found += 1;

	*created = true;

	dbg_bld("added volume %d", vol_id);

	return av;

}



/**

 * ubi_find_or_add_av - search for a volume in the attaching information and

 *			add one if it does not exist.

 * @ai: attaching information

 * @vol_id: the requested volume ID

 * @created: whether the volume has been created or not

 *

 * This function returns a pointer to the new volume description or an

 * ERR_PTR if the operation failed.

 */

static struct ubi_ainf_volume *ubi_find_or_add_av(struct ubi_attach_info *ai,

						  int vol_id, bool *created)

{

	return find_or_add_av(ai, vol_id, AV_FIND_OR_ADD, created);

}



/**

 * add_to_list - add physical eraseblock to a list.

 * @ai: attaching information
@@ -294,44 +380,20 @@ static struct ubi_ainf_volume *add_volume(struct ubi_attach_info *ai, 
					  const struct ubi_vid_hdr *vid_hdr)

{

	struct ubi_ainf_volume *av;

	struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;

	bool created;



	ubi_assert(vol_id == be32_to_cpu(vid_hdr->vol_id));



	/* Walk the volume RB-tree to look if this volume is already present */

	while (*p) {

		parent = *p;

		av = rb_entry(parent, struct ubi_ainf_volume, rb);



		if (vol_id == av->vol_id)

	av = ubi_find_or_add_av(ai, vol_id, &created);

	if (IS_ERR(av) || !created)

		return av;



		if (vol_id > av->vol_id)

			p = &(*p)->rb_left;

		else

			p = &(*p)->rb_right;

	}



	/* The volume is absent - add it */

	av = kmalloc(sizeof(struct ubi_ainf_volume), GFP_KERNEL);

	if (!av)

		return ERR_PTR(-ENOMEM);



	av->highest_lnum = av->leb_count = 0;

	av->vol_id = vol_id;

	av->root = RB_ROOT;

	av->used_ebs = be32_to_cpu(vid_hdr->used_ebs);

	av->data_pad = be32_to_cpu(vid_hdr->data_pad);

	av->compat = vid_hdr->compat;

	av->vol_type = vid_hdr->vol_type == UBI_VID_DYNAMIC ? UBI_DYNAMIC_VOLUME

							    : UBI_STATIC_VOLUME;

	if (vol_id > ai->highest_vol_id)

		ai->highest_vol_id = vol_id;



	rb_link_node(&av->rb, parent, p);

	rb_insert_color(&av->rb, &ai->volumes);

	ai->vols_found += 1;

	dbg_bld("added volume %d", vol_id);

	return av;

}
@@ -628,6 +690,21 @@ int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum, 
	return 0;

}



/**

 * ubi_add_av - add volume to the attaching information.

 * @ai: attaching information

 * @vol_id: the requested volume ID

 *

 * This function returns a pointer to the new volume description or an

 * ERR_PTR if the operation failed.

 */

struct ubi_ainf_volume *ubi_add_av(struct ubi_attach_info *ai, int vol_id)

{

	bool created;



	return find_or_add_av(ai, vol_id, AV_ADD, &created);

}



/**

 * ubi_find_av - find volume in the attaching information.

 * @ai: attaching information
@@ -639,22 +716,10 @@ int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum, 
struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai,

				    int vol_id)

{

	struct ubi_ainf_volume *av;

	struct rb_node *p = ai->volumes.rb_node;



	while (p) {

		av = rb_entry(p, struct ubi_ainf_volume, rb);



		if (vol_id == av->vol_id)

			return av;

	bool created;



		if (vol_id > av->vol_id)

			p = p->rb_left;

		else

			p = p->rb_right;

	}



	return NULL;

	return find_or_add_av((struct ubi_attach_info *)ai, vol_id, AV_FIND,

			      &created);

}



/**

drivers/mtd/ubi/fastmap.c

+3 −24
Original line number Diff line number Diff line
@@ -186,40 +186,19 @@ static struct ubi_ainf_volume *add_vol(struct ubi_attach_info *ai, int vol_id, 
				       int last_eb_bytes)

{

	struct ubi_ainf_volume *av;

	struct rb_node **p = &ai->volumes.rb_node, *parent = NULL;



	while (*p) {

		parent = *p;

		av = rb_entry(parent, struct ubi_ainf_volume, rb);



		if (vol_id > av->vol_id)

			p = &(*p)->rb_left;

		else if (vol_id < av->vol_id)

			p = &(*p)->rb_right;

		else

			return ERR_PTR(-EINVAL);

	}



	av = kmalloc(sizeof(struct ubi_ainf_volume), GFP_KERNEL);

	if (!av)

		goto out;

	av = ubi_add_av(ai, vol_id);

	if (IS_ERR(av))

		return av;



	av->highest_lnum = av->leb_count = av->used_ebs = 0;

	av->vol_id = vol_id;

	av->data_pad = data_pad;

	av->last_data_size = last_eb_bytes;

	av->compat = 0;

	av->vol_type = vol_type;

	av->root = RB_ROOT;

	if (av->vol_type == UBI_STATIC_VOLUME)

		av->used_ebs = used_ebs;



	dbg_bld("found volume (ID %i)", vol_id);



	rb_link_node(&av->rb, parent, p);

	rb_insert_color(&av->rb, &ai->volumes);



out:

	return av;

}

drivers/mtd/ubi/ubi.h

+1 −0
Original line number Diff line number Diff line
@@ -794,6 +794,7 @@ extern struct blocking_notifier_head ubi_notifiers; 
/* attach.c */

int ubi_add_to_av(struct ubi_device *ubi, struct ubi_attach_info *ai, int pnum,

		  int ec, const struct ubi_vid_hdr *vid_hdr, int bitflips);

struct ubi_ainf_volume *ubi_add_av(struct ubi_attach_info *ai, int vol_id);

struct ubi_ainf_volume *ubi_find_av(const struct ubi_attach_info *ai,

				    int vol_id);

void ubi_remove_av(struct ubi_attach_info *ai, struct ubi_ainf_volume *av);