From: Theodore Ts'o tytso@mit.edu
[ Upstream commit 538bcaa6261b77e71d37f5596c33127c1a3ec3f7 ]
The jbd2 superblock is lockless now, so there is probably a race condition between writing it so disk and modifing contents of it, which may lead to checksum error. The following race is the one case that we have captured.
jbd2 fsstress jbd2_journal_commit_transaction jbd2_journal_update_sb_log_tail jbd2_write_superblock jbd2_superblock_csum_set jbd2_journal_revoke jbd2_journal_set_features(revork) modify superblock submit_bh(checksum incorrect)
Fix this by locking the buffer head before modifing it. We always write the jbd2 superblock after we modify it, so this just means calling the lock_buffer() a little earlier.
This checksum corruption problem can be reproduced by xfstests generic/475.
Reported-by: zhangyi (F) yi.zhang@huawei.com Suggested-by: Jan Kara jack@suse.cz Signed-off-by: Theodore Ts'o tytso@mit.edu Signed-off-by: Sasha Levin sashal@kernel.org --- fs/jbd2/journal.c | 52 ++++++++++++++++++++++++----------------------- 1 file changed, 27 insertions(+), 25 deletions(-)
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c index 61d48f0c41a1..0c8f77db60e2 100644 --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -1343,6 +1343,10 @@ static int journal_reset(journal_t *journal) return jbd2_journal_start_thread(journal); }
+/* + * This function expects that the caller will have locked the journal + * buffer head, and will return with it unlocked + */ static int jbd2_write_superblock(journal_t *journal, int write_flags) { struct buffer_head *bh = journal->j_sb_buffer; @@ -1352,7 +1356,6 @@ static int jbd2_write_superblock(journal_t *journal, int write_flags) trace_jbd2_write_superblock(journal, write_flags); if (!(journal->j_flags & JBD2_BARRIER)) write_flags &= ~(REQ_FUA | REQ_PREFLUSH); - lock_buffer(bh); if (buffer_write_io_error(bh)) { /* * Oh, dear. A previous attempt to write the journal @@ -1411,6 +1414,7 @@ int jbd2_journal_update_sb_log_tail(journal_t *journal, tid_t tail_tid, jbd_debug(1, "JBD2: updating superblock (start %lu, seq %u)\n", tail_block, tail_tid);
+ lock_buffer(journal->j_sb_buffer); sb->s_sequence = cpu_to_be32(tail_tid); sb->s_start = cpu_to_be32(tail_block);
@@ -1441,18 +1445,17 @@ static void jbd2_mark_journal_empty(journal_t *journal, int write_op) journal_superblock_t *sb = journal->j_superblock;
BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); - read_lock(&journal->j_state_lock); - /* Is it already empty? */ - if (sb->s_start == 0) { - read_unlock(&journal->j_state_lock); + lock_buffer(journal->j_sb_buffer); + if (sb->s_start == 0) { /* Is it already empty? */ + unlock_buffer(journal->j_sb_buffer); return; } + jbd_debug(1, "JBD2: Marking journal as empty (seq %d)\n", journal->j_tail_sequence);
sb->s_sequence = cpu_to_be32(journal->j_tail_sequence); sb->s_start = cpu_to_be32(0); - read_unlock(&journal->j_state_lock);
jbd2_write_superblock(journal, write_op);
@@ -1475,9 +1478,8 @@ void jbd2_journal_update_sb_errno(journal_t *journal) journal_superblock_t *sb = journal->j_superblock; int errcode;
- read_lock(&journal->j_state_lock); + lock_buffer(journal->j_sb_buffer); errcode = journal->j_errno; - read_unlock(&journal->j_state_lock); if (errcode == -ESHUTDOWN) errcode = 0; jbd_debug(1, "JBD2: updating superblock error (errno %d)\n", errcode); @@ -1881,28 +1883,27 @@ int jbd2_journal_set_features (journal_t *journal, unsigned long compat,
sb = journal->j_superblock;
+ /* Load the checksum driver if necessary */ + if ((journal->j_chksum_driver == NULL) && + INCOMPAT_FEATURE_ON(JBD2_FEATURE_INCOMPAT_CSUM_V3)) { + journal->j_chksum_driver = crypto_alloc_shash("crc32c", 0, 0); + if (IS_ERR(journal->j_chksum_driver)) { + printk(KERN_ERR "JBD2: Cannot load crc32c driver.\n"); + journal->j_chksum_driver = NULL; + return 0; + } + /* Precompute checksum seed for all metadata */ + journal->j_csum_seed = jbd2_chksum(journal, ~0, sb->s_uuid, + sizeof(sb->s_uuid)); + } + + lock_buffer(journal->j_sb_buffer); + /* If enabling v3 checksums, update superblock */ if (INCOMPAT_FEATURE_ON(JBD2_FEATURE_INCOMPAT_CSUM_V3)) { sb->s_checksum_type = JBD2_CRC32C_CHKSUM; sb->s_feature_compat &= ~cpu_to_be32(JBD2_FEATURE_COMPAT_CHECKSUM); - - /* Load the checksum driver */ - if (journal->j_chksum_driver == NULL) { - journal->j_chksum_driver = crypto_alloc_shash("crc32c", - 0, 0); - if (IS_ERR(journal->j_chksum_driver)) { - printk(KERN_ERR "JBD2: Cannot load crc32c " - "driver.\n"); - journal->j_chksum_driver = NULL; - return 0; - } - - /* Precompute checksum seed for all metadata */ - journal->j_csum_seed = jbd2_chksum(journal, ~0, - sb->s_uuid, - sizeof(sb->s_uuid)); - } }
/* If enabling v1 checksums, downgrade superblock */ @@ -1914,6 +1915,7 @@ int jbd2_journal_set_features (journal_t *journal, unsigned long compat, sb->s_feature_compat |= cpu_to_be32(compat); sb->s_feature_ro_compat |= cpu_to_be32(ro); sb->s_feature_incompat |= cpu_to_be32(incompat); + unlock_buffer(journal->j_sb_buffer);
return 1; #undef COMPAT_FEATURE_ON