lkml.org 
[lkml]   [2019]   [Apr]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.19 096/187] jbd2: fix race when writing superblock
Date
4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

[ 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 8ef6b6daaa7a..88f2a49338a1 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1356,6 +1356,10 @@ 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;
@@ -1365,7 +1369,6 @@ 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
@@ -1424,6 +1427,7 @@ 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);

@@ -1454,18 +1458,17 @@ 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);

@@ -1488,9 +1491,8 @@ 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);
@@ -1894,28 +1896,27 @@ 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 */
@@ -1927,6 +1928,7 @@ 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
--
2.19.1


\
 
 \ /
  Last update: 2019-04-04 11:39    [W:0.447 / U:2.224 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site