diff options
Diffstat (limited to 'fs/jbd2')
| -rw-r--r-- | fs/jbd2/journal.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c index 89f9eb35323d..ef9d75cca362 100644 --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -1347,6 +1347,7 @@ static void journal_fail_superblock(journal_t *journal) static int journal_check_superblock(journal_t *journal) { journal_superblock_t *sb = journal->j_superblock; + int num_fc_blks; int err = -EINVAL; if (sb->s_header.h_magic != cpu_to_be32(JBD2_MAGIC_NUMBER) || @@ -1389,6 +1390,15 @@ static int journal_check_superblock(journal_t *journal) return err; } + num_fc_blks = jbd2_has_feature_fast_commit(journal) ? + jbd2_journal_get_num_fc_blks(sb) : 0; + if (be32_to_cpu(sb->s_maxlen) < JBD2_MIN_JOURNAL_BLOCKS || + be32_to_cpu(sb->s_maxlen) - JBD2_MIN_JOURNAL_BLOCKS < num_fc_blks) { + printk(KERN_ERR "JBD2: journal file too short %u,%d\n", + be32_to_cpu(sb->s_maxlen), num_fc_blks); + return err; + } + if (jbd2_has_feature_csum2(journal) && jbd2_has_feature_csum3(journal)) { /* Can't have checksum v2 and v3 at the same time! */ @@ -1454,7 +1464,6 @@ static int journal_load_superblock(journal_t *journal) int err; struct buffer_head *bh; journal_superblock_t *sb; - int num_fc_blocks; bh = getblk_unmovable(journal->j_dev, journal->j_blk_offset, journal->j_blocksize); @@ -1492,9 +1501,8 @@ static int journal_load_superblock(journal_t *journal) if (jbd2_has_feature_fast_commit(journal)) { journal->j_fc_last = be32_to_cpu(sb->s_maxlen); - num_fc_blocks = jbd2_journal_get_num_fc_blks(sb); - if (journal->j_last - num_fc_blocks >= JBD2_MIN_JOURNAL_BLOCKS) - journal->j_last = journal->j_fc_last - num_fc_blocks; + journal->j_last = journal->j_fc_last - + jbd2_journal_get_num_fc_blks(sb); journal->j_fc_first = journal->j_last + 1; journal->j_fc_off = 0; } |