From 7d08ae3c9205b559f90c3d7a3abba3c6479673c7 Mon Sep 17 00:00:00 2001
From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Date: Sun, 17 Oct 2010 15:50:19 +0300
Subject: UBIFS: add a commentary about log recovery
Add a commentary which elaborates that 'ubifs_recover_log_leb()' recovers only
the last log LEB, not any. Also remove some unneeded newlines.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
---
fs/ubifs/recovery.c | 3 ++-
fs/ubifs/replay.c | 9 +++++----
2 files changed, 7 insertions(+), 5 deletions(-)
(limited to 'fs/ubifs')
diff --git a/fs/ubifs/recovery.c b/fs/ubifs/recovery.c
index c902a5de90ae..77e9b874b6c2 100644
--- a/fs/ubifs/recovery.c
+++ b/fs/ubifs/recovery.c
@@ -772,7 +772,8 @@ out_free:
* @sbuf: LEB-sized buffer to use
*
* This function does a scan of a LEB, but caters for errors that might have
- * been caused by the unclean unmount from which we are attempting to recover.
+ * been caused by unclean reboots from which we are attempting to recover
+ * (assume that only the last log LEB can be corrupted by an unclean reboot).
*
* This function returns %0 on success and a negative error code on failure.
*/
diff --git a/fs/ubifs/replay.c b/fs/ubifs/replay.c
index 730598cf6342..7df04ba4878e 100644
--- a/fs/ubifs/replay.c
+++ b/fs/ubifs/replay.c
@@ -839,6 +839,11 @@ static int replay_log_leb(struct ubifs_info *c, int lnum, int offs, void *sbuf)
if (IS_ERR(sleb)) {
if (PTR_ERR(sleb) != -EUCLEAN || !c->need_recovery)
return PTR_ERR(sleb);
+ /*
+ * Note, the below function will recover this log LEB only if
+ * it is the last, because unclean reboots can possibly corrupt
+ * only the tail of the log.
+ */
sleb = ubifs_recover_log_leb(c, lnum, offs, sbuf);
if (IS_ERR(sleb))
return PTR_ERR(sleb);
@@ -850,7 +855,6 @@ static int replay_log_leb(struct ubifs_info *c, int lnum, int offs, void *sbuf)
}
node = sleb->buf;
-
snod = list_entry(sleb->nodes.next, struct ubifs_scan_node, list);
if (c->cs_sqnum == 0) {
/*
@@ -897,7 +901,6 @@ static int replay_log_leb(struct ubifs_info *c, int lnum, int offs, void *sbuf)
}
list_for_each_entry(snod, &sleb->nodes, list) {
-
cond_resched();
if (snod->sqnum >= SQNUM_WATERMARK) {
@@ -1030,9 +1033,7 @@ int ubifs_replay_journal(struct ubifs_info *c)
return -ENOMEM;
dbg_mnt("start replaying the journal");
-
c->replaying = 1;
-
lnum = c->ltail_lnum = c->lhead_lnum;
offs = c->lhead_offs;
--
cgit v1.2.1