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authorZhang Yi <yi.zhang@huawei.com>2023-08-11 09:36:05 +0300
committerTheodore Ts'o <tytso@mit.edu>2023-08-15 16:00:33 +0300
commit0dbc759ae9971568af24def1b01d5b1aa87bd546 (patch)
tree6b1fdcd8b63c5b2e9f3d64e0f4f86f450abf20c3 /fs/jbd2
parent054d9c8fef14d476f1a9c6434de86813c5990052 (diff)
downloadlinux-0dbc759ae9971568af24def1b01d5b1aa87bd546.tar.xz
jbd2: add fast_commit space check
If JBD2_FEATURE_INCOMPAT_FAST_COMMIT bit is set, it means the journal have fast commit records need to recover, so the fast commit size should not be too large, and the leftover normal journal size should never less than JBD2_MIN_JOURNAL_BLOCKS. If it happens, the journal->j_last is likely to be wrong and will probably lead to incorrect journal recovery. So add a check into the journal_check_superblock(), and drop the pointless check when initializing the fastcommit parameters. Signed-off-by: Zhang Yi <yi.zhang@huawei.com> Reviewed-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20230811063610.2980059-8-yi.zhang@huaweicloud.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2')
-rw-r--r--fs/jbd2/journal.c16
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;
}