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Commit 61799206 authored by Artem Bityutskiy's avatar Artem Bityutskiy
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UBIFS: clean up LEB recovery function 



This patch cleans up 'ubifs_recover_leb()' function and makes it more readable.
Move things which are done only once out of the loop and kill unneeded 'switch'
statement.

Signed-off-by: default avatarArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
parent 9d510db4

fs/ubifs/recovery.c

+28 −56
Original line number Diff line number Diff line
@@ -609,8 +609,8 @@ static int drop_incomplete_group(struct ubifs_scan_leb *sleb, int *offs) 
struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum,

					 int offs, void *sbuf, int grouped)

{

	int err, len = c->leb_size - offs, need_clean = 0, quiet = 1;

	int empty_chkd = 0, start = offs;

	int ret = 0, err, len = c->leb_size - offs, need_clean = 0;

	int start = offs;

	struct ubifs_scan_leb *sleb;

	void *buf = sbuf + offs;
@@ -624,8 +624,6 @@ struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum, 
		need_clean = 1;



	while (len >= 8) {

		int ret;



		dbg_scan("look at LEB %d:%d (%d bytes left)",

			 lnum, offs, len);
@@ -635,8 +633,7 @@ struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum, 
		 * Scan quietly until there is an error from which we cannot

		 * recover

		 */

		ret = ubifs_scan_a_node(c, buf, len, lnum, offs, quiet);



		ret = ubifs_scan_a_node(c, buf, len, lnum, offs, 0);

		if (ret == SCANNED_A_NODE) {

			/* A valid node, and not a padding node */

			struct ubifs_ch *ch = buf;
@@ -649,66 +646,37 @@ struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum, 
			offs += node_len;

			buf += node_len;

			len -= node_len;

			continue;

		}



		if (ret > 0) {

		} else if (ret > 0) {

			/* Padding bytes or a valid padding node */

			offs += ret;

			buf += ret;

			len -= ret;

			continue;

		}



		if (ret == SCANNED_EMPTY_SPACE) {

			if (!is_empty(buf, len)) {

				if (!is_last_write(c, buf, offs))

		} else if (ret == SCANNED_EMPTY_SPACE ||

			   ret == SCANNED_GARBAGE     ||

			   ret == SCANNED_A_BAD_PAD_NODE ||

			   ret == SCANNED_A_CORRUPT_NODE) {

			dbg_rcvry("found corruption - %d", ret);

			break;

				clean_buf(c, &buf, lnum, &offs, &len);

				need_clean = 1;

		} else {

			dbg_err("unexpected return value %d", ret);

			err = -EINVAL;

			goto error;

		}

			empty_chkd = 1;

			break;

	}



		if (ret == SCANNED_GARBAGE || ret == SCANNED_A_BAD_PAD_NODE)

	if (ret == SCANNED_GARBAGE || ret == SCANNED_A_BAD_PAD_NODE) {

		if (is_last_write(c, buf, offs)) {

			clean_buf(c, &buf, lnum, &offs, &len);

			need_clean = 1;

				empty_chkd = 1;

				break;

			}



		if (ret == SCANNED_A_CORRUPT_NODE)

		} else

			goto corrupted_rescan;

	} else if (ret == SCANNED_A_CORRUPT_NODE) {

		if (no_more_nodes(c, buf, len, lnum, offs)) {

			clean_buf(c, &buf, lnum, &offs, &len);

			need_clean = 1;

				empty_chkd = 1;

				break;

			}



		if (quiet) {

			/* Redo the last scan but noisily */

			quiet = 0;

			continue;

		}



		switch (ret) {

		case SCANNED_GARBAGE:

			dbg_err("garbage");

			goto corrupted;

		case SCANNED_A_CORRUPT_NODE:

		case SCANNED_A_BAD_PAD_NODE:

			dbg_err("bad node");

			goto corrupted;

		default:

			dbg_err("unknown");

			err = -EINVAL;

			goto error;

		}

	}



	if (!empty_chkd && !is_empty(buf, len)) {

		} else

			goto corrupted_rescan;

	} else if (!is_empty(buf, len)) {

		if (is_last_write(c, buf, offs)) {

			clean_buf(c, &buf, lnum, &offs, &len);

			need_clean = 1;
@@ -751,6 +719,10 @@ struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum, 


	return sleb;



corrupted_rescan:

	/* Re-scan the corrupted data with verbose messages */

	dbg_err("corruptio %d", ret);

	ubifs_scan_a_node(c, buf, len, lnum, offs, 1);

corrupted:

	ubifs_scanned_corruption(c, lnum, offs, buf);

	err = -EUCLEAN;