If some log records write across more than 2 log pages unfortunately,
current fsck may not read log record correctly.
so. we should make fsck utility to be able to read log record correctly.
I tested it several times. and it works well.
diff -ruN jfsutils-1.1.13/libfs/log_read.c
jfsutils-1.1.13.patched/libfs/log_read.c
--- jfsutils-1.1.13/libfs/log_read.c 2005-11-23 05:43:55.000000000 +0900
+++ jfsutils-1.1.13.patched/libfs/log_read.c 2008-08-29
15:41:03.918875268 +0900
@@ -474,8 +474,9 @@
* get the previous page
*/
- if (words != nwords /* we get less than nwords */
- || j < 0) { /* or exhaust the page, so offset is just */
+ while (words != nwords /* we get less than nwords */
+ || j < 0) { /* or exhaust the page, so offset is just */
+ nwords -= words;
/* the page head, then j < 0 */
/* get previous page */
pno = logptr[*buf];
@@ -493,14 +494,17 @@
*offset = LOGPSIZE - LOGPTLRSIZE;
/* index last word of data area */
j = LOGPSIZE / 4 - 4 - 1;
- /* move rest of nwords if any. this will never
- exhaust the page. */
- for (n = 0; n < nwords - words; n++) {
+ /* move rest of nwords if any. */
+ for (n = 0; n < nwords; n++) {
+ if (j < 0) {
+ break;
+ }
*ptr = logp[*buf].data[j];
j = j - 1;
ptr = ptr - 1;
}
- *offset = *offset - 4 * (nwords - words);
+ words = n;
+ *offset = *offset - 4 * nwords;
}
return (0);
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