Commit 62f38455 authored by Joel Reardon's avatar Joel Reardon Committed by Artem Bityutskiy
Browse files

UBI: modify ubi_wl_flush function to clear work queue for a lnum 



This patch modifies ubi_wl_flush to force the erasure of
particular volume id / logical eraseblock number pairs. Previous functionality
is preserved when passing UBI_ALL for both values. The locations where ubi_wl_flush
were called are appropriately changed: ubi_leb_erase only flushes for the
erased LEB, and ubi_create_volume forces only flushing for its volume id.
External code can call this new feature via the new function ubi_flush() added
to kapi.c, which simply passes through to ubi_wl_flush().

This was tested by disabling the call to do_work in ubi thread, which results
in the work queue remaining unless explicitly called to remove. UBIFS was
changed to call ubifs_leb_change 50 times for four different LEBs. Then the
new function was called to clear the queue: passing wrong volume ids / lnum,
correct ones, and finally UBI_ALL for both to ensure it was finally all
cleard. The work queue was dumped each time and the selective removal
of the particular LEB numbers was observed. Extra checks were enabled and
ubifs's integck was also run. Finally, the drive was repeatedly filled and
emptied to ensure that the queue was cleared normally.

Artem: amended the patch.

Signed-off-by: default avatarJoel Reardon <reardonj@inf.ethz.ch>
Signed-off-by: default avatarArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
parent 05a3cb7d

drivers/mtd/ubi/cdev.c

+1 −1
Original line number Diff line number Diff line
@@ -514,7 +514,7 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd, 
		if (err)

			break;



		err = ubi_wl_flush(ubi);

		err = ubi_wl_flush(ubi, UBI_ALL, UBI_ALL);

		break;

	}

drivers/mtd/ubi/kapi.c

+28 −1
Original line number Diff line number Diff line
@@ -551,7 +551,7 @@ int ubi_leb_erase(struct ubi_volume_desc *desc, int lnum) 
	if (err)

		return err;



	return ubi_wl_flush(ubi);

	return ubi_wl_flush(ubi, vol->vol_id, lnum);

}

EXPORT_SYMBOL_GPL(ubi_leb_erase);
@@ -704,6 +704,33 @@ int ubi_sync(int ubi_num) 
}

EXPORT_SYMBOL_GPL(ubi_sync);



/**

 * ubi_flush - flush UBI work queue.

 * @ubi_num: UBI device to flush work queue

 * @vol_id: volume id to flush for

 * @lnum: logical eraseblock number to flush for

 *

 * This function executes all pending works for a particular volume id / logical

 * eraseblock number pair. If either value is set to %UBI_ALL, then it acts as

 * a wildcard for all of the corresponding volume numbers or logical

 * eraseblock numbers. It returns zero in case of success and a negative error

 * code in case of failure.

 */

int ubi_flush(int ubi_num, int vol_id, int lnum)

{

	struct ubi_device *ubi;

	int err = 0;



	ubi = ubi_get_device(ubi_num);

	if (!ubi)

		return -ENODEV;



	err = ubi_wl_flush(ubi, vol_id, lnum);

	ubi_put_device(ubi);

	return err;

}

EXPORT_SYMBOL_GPL(ubi_flush);



BLOCKING_NOTIFIER_HEAD(ubi_notifiers);



/**

drivers/mtd/ubi/ubi.h

+1 −1
Original line number Diff line number Diff line
@@ -669,7 +669,7 @@ int ubi_eba_init(struct ubi_device *ubi, struct ubi_attach_info *ai); 
int ubi_wl_get_peb(struct ubi_device *ubi);

int ubi_wl_put_peb(struct ubi_device *ubi, int vol_id, int lnum,

		   int pnum, int torture);

int ubi_wl_flush(struct ubi_device *ubi);

int ubi_wl_flush(struct ubi_device *ubi, int vol_id, int lnum);

int ubi_wl_scrub_peb(struct ubi_device *ubi, int pnum);

int ubi_wl_init(struct ubi_device *ubi, struct ubi_attach_info *ai);

void ubi_wl_close(struct ubi_device *ubi);

drivers/mtd/ubi/upd.c

+2 −2
Original line number Diff line number Diff line
@@ -147,7 +147,7 @@ int ubi_start_update(struct ubi_device *ubi, struct ubi_volume *vol, 
	}



	if (bytes == 0) {

		err = ubi_wl_flush(ubi);

		err = ubi_wl_flush(ubi, UBI_ALL, UBI_ALL);

		if (err)

			return err;
@@ -361,7 +361,7 @@ int ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol, 


	ubi_assert(vol->upd_received <= vol->upd_bytes);

	if (vol->upd_received == vol->upd_bytes) {

		err = ubi_wl_flush(ubi);

		err = ubi_wl_flush(ubi, UBI_ALL, UBI_ALL);

		if (err)

			return err;

		/* The update is finished, clear the update marker */

drivers/mtd/ubi/vmt.c

+1 −1
Original line number Diff line number Diff line
@@ -280,7 +280,7 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req) 
	 * Finish all pending erases because there may be some LEBs belonging

	 * to the same volume ID.

	 */

	err = ubi_wl_flush(ubi);

	err = ubi_wl_flush(ubi, vol_id, UBI_ALL);

	if (err)

		goto out_acc;

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