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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>
This commit is contained in:
Artem Bityutskiy 2010-10-17 15:50:19 +03:00
parent 54dd55a406
commit 7d08ae3c92
2 changed files with 7 additions and 5 deletions
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3
fs/ubifs/recovery.c
View File

@ -772,7 +772,8 @@ static int get_cs_sqnum(struct ubifs_info *c, int lnum, int offs,
* @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.
*/

9
fs/ubifs/replay.c
View File

@ -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;