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-rw-r--r--fs/jbd2/checkpoint.c1
-rw-r--r--fs/jbd2/journal.c4
2 files changed, 4 insertions, 1 deletions
diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c
index 02e0b79753e7..a1909066bde6 100644
--- a/fs/jbd2/checkpoint.c
+++ b/fs/jbd2/checkpoint.c
@@ -132,7 +132,6 @@ void __jbd2_log_wait_for_space(journal_t *journal)
return;
}
spin_lock(&journal->j_list_lock);
- nblocks = jbd2_space_needed(journal);
space_left = jbd2_log_space_left(journal);
if (space_left < nblocks) {
int chkpt = journal->j_checkpoint_transactions != NULL;
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 382c030cc78b..37e16d969925 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1350,6 +1350,10 @@ static int jbd2_write_superblock(journal_t *journal, int write_flags)
journal_superblock_t *sb = journal->j_superblock;
int ret;
+ /* Buffer got discarded which means block device got invalidated */
+ if (!buffer_mapped(bh))
+ return -EIO;
+
trace_jbd2_write_superblock(journal, write_flags);
if (!(journal->j_flags & JBD2_BARRIER))
write_flags &= ~(REQ_FUA | REQ_PREFLUSH);