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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2011-05-16 13:41:55 +0300
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2011-05-16 15:48:48 +0300
commit617992069513c1e789c707c4d75ff03bf7dd0fb0 (patch)
tree04ee36190d991f0b7836fff0a666b9847bf32d92 /fs/ubifs/recovery.c
parent9d510db423303b4f3555074dd7bdd0d692e432a4 (diff)
downloadlinux-617992069513c1e789c707c4d75ff03bf7dd0fb0.tar.bz2
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: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'fs/ubifs/recovery.c')
-rw-r--r--fs/ubifs/recovery.c84
1 files changed, 28 insertions, 56 deletions
diff --git a/fs/ubifs/recovery.c b/fs/ubifs/recovery.c
index 42b4512c46b0..7d922033d666 100644
--- a/fs/ubifs/recovery.c
+++ b/fs/ubifs/recovery.c
@@ -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))
- break;
- clean_buf(c, &buf, lnum, &offs, &len);
- need_clean = 1;
- }
- empty_chkd = 1;
+ } 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;
- }
-
- 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)
- 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");
+ } else {
+ dbg_err("unexpected return value %d", ret);
err = -EINVAL;
goto error;
}
}
- if (!empty_chkd && !is_empty(buf, len)) {
+ 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;
+ } 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;
+ } 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;