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jbd: Fail to load a journal if it is too short 

Due to on disk corruption, it can happen that journal is too short. Fail
to load it in such case so that we don't oops somewhere later.

Reported-by: Nageswara R Sastry <rnsastry@linux.vnet.ibm.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2009-07-15 20:36:08 +02:00
parent e9e961c9a8
commit 7447a668a3
1 changed files with 6 additions and 0 deletions
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6
fs/jbd/journal.c
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@ -848,6 +848,12 @@ static int journal_reset(journal_t *journal)
first = be32_to_cpu(sb->s_first); first = be32_to_cpu(sb->s_first);
last = be32_to_cpu(sb->s_maxlen); last = be32_to_cpu(sb->s_maxlen);
if (first + JFS_MIN_JOURNAL_BLOCKS > last + 1) {
printk(KERN_ERR "JBD: Journal too short (blocks %lu-%lu).\n",
first, last);
journal_fail_superblock(journal);
return -EINVAL;
}
journal->j_first = first; journal->j_first = first;
journal->j_last = last; journal->j_last = last;