[PATCH 1/2] ext4: fix sparse warnings

[PATCH 1/2] ext4: fix sparse warnings

[Theodore Ts'o]

Add sparse annotations to suppress false positive context imbalance
warnings, and use NULL instead of 0 in EXT_MAX_{EXTENT,INDEX}.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---
 fs/ext4/ext4_extents.h |  5 +++--
 fs/ext4/mballoc.c      | 26 ++++++++++++++++++++++----
 2 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/fs/ext4/ext4_extents.h b/fs/ext4/ext4_extents.h
index 44e59881a1f0..26435f3a3094 100644
--- a/fs/ext4/ext4_extents.h
+++ b/fs/ext4/ext4_extents.h
@@ -173,10 +173,11 @@ struct partial_cluster {
 #define EXT_MAX_EXTENT(__hdr__)	\
 	((le16_to_cpu((__hdr__)->eh_max)) ? \
 	((EXT_FIRST_EXTENT((__hdr__)) + le16_to_cpu((__hdr__)->eh_max) - 1)) \
-					: 0)
+					: NULL)
 #define EXT_MAX_INDEX(__hdr__) \
 	((le16_to_cpu((__hdr__)->eh_max)) ? \
-	((EXT_FIRST_INDEX((__hdr__)) + le16_to_cpu((__hdr__)->eh_max) - 1)) : 0)
+	((EXT_FIRST_INDEX((__hdr__)) + le16_to_cpu((__hdr__)->eh_max) - 1)) \
+					: NULL)
 
 static inline struct ext4_extent_header *ext_inode_hdr(struct inode *inode)
 {
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index a496509e61b7..e89db3396203 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2479,6 +2479,12 @@ static bool ext4_mb_good_group(struct ext4_allocation_context *ac,
  * This could return negative error code if something goes wrong
  * during ext4_mb_init_group(). This should not be called with
  * ext4_lock_group() held.
+ *
+ * Note: because we are conditionally operating with the group lock in
+ * the EXT4_MB_STRICT_CHECK case, we need to fake out sparse in this
+ * function using __acquire and __release.  This means we need to be
+ * super careful before messing with the error path handling via "goto
+ * out"!
  */
 static int ext4_mb_good_group_nolock(struct ext4_allocation_context *ac,
 				     ext4_group_t group, int cr)
@@ -2492,8 +2498,10 @@ static int ext4_mb_good_group_nolock(struct ext4_allocation_context *ac,
 
 	if (sbi->s_mb_stats)
 		atomic64_inc(&sbi->s_bal_cX_groups_considered[ac->ac_criteria]);
-	if (should_lock)
+	if (should_lock) {
 		ext4_lock_group(sb, group);
+		__release(ext4_group_lock_ptr(sb, group));
+	}
 	free = grp->bb_free;
 	if (free == 0)
 		goto out;
@@ -2501,8 +2509,10 @@ static int ext4_mb_good_group_nolock(struct ext4_allocation_context *ac,
 		goto out;
 	if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(grp)))
 		goto out;
-	if (should_lock)
+	if (should_lock) {
+		__acquire(ext4_group_lock_ptr(sb, group));
 		ext4_unlock_group(sb, group);
+	}
 
 	/* We only do this if the grp has never been initialized */
 	if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) {
@@ -2529,12 +2539,16 @@ static int ext4_mb_good_group_nolock(struct ext4_allocation_context *ac,
 			return ret;
 	}
 
-	if (should_lock)
+	if (should_lock) {
 		ext4_lock_group(sb, group);
+		__release(ext4_group_lock_ptr(sb, group));
+	}
 	ret = ext4_mb_good_group(ac, group, cr);
 out:
-	if (should_lock)
+	if (should_lock) {
+		__acquire(ext4_group_lock_ptr(sb, group));
 		ext4_unlock_group(sb, group);
+	}
 	return ret;
 }
 
@@ -2970,6 +2984,7 @@ int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset)
 }
 
 static void *ext4_mb_seq_structs_summary_start(struct seq_file *seq, loff_t *pos)
+__acquires(&EXT4_SB(sb)->s_mb_rb_lock)
 {
 	struct super_block *sb = PDE_DATA(file_inode(seq->file));
 	unsigned long position;
@@ -3042,6 +3057,7 @@ static int ext4_mb_seq_structs_summary_show(struct seq_file *seq, void *v)
 }
 
 static void ext4_mb_seq_structs_summary_stop(struct seq_file *seq, void *v)
+__releases(&EXT4_SB(sb)->s_mb_rb_lock)
 {
 	struct super_block *sb = PDE_DATA(file_inode(seq->file));
 
@@ -6280,6 +6296,8 @@ __acquires(bitlock)
 static int ext4_try_to_trim_range(struct super_block *sb,
 		struct ext4_buddy *e4b, ext4_grpblk_t start,
 		ext4_grpblk_t max, ext4_grpblk_t minblocks)
+__acquires(ext4_group_lock_ptr(sb, e4b->bd_group))
+__releases(ext4_group_lock_ptr(sb, e4b->bd_group))
 {
 	ext4_grpblk_t next, count, free_count;
 	void *bitmap;
-- 
2.31.0

[PATCH 2/2] jbd2: add sparse annotations for add_transaction_credits()

[Theodore Ts'o]

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---
 fs/jbd2/transaction.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 8804e126805f..5347411ae13e 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -223,9 +223,15 @@ static void sub_reserved_credits(journal_t *journal, int blocks)
  * with j_state_lock held for reading. Returns 0 if handle joined the running
  * transaction. Returns 1 if we had to wait, j_state_lock is dropped, and
  * caller must retry.
+ *
+ * Note: because j_state_lock may be dropped depending on the return
+ * value, we need to fake out sparse so ti doesn't complain about a
+ * locking imbalance.  Callers of add_transaction_credits will need to
+ * make a similar accomodation.
  */
 static int add_transaction_credits(journal_t *journal, int blocks,
 				   int rsv_blocks)
+__must_hold(&journal->j_state_lock)
 {
 	transaction_t *t = journal->j_running_transaction;
 	int needed;
@@ -238,6 +244,7 @@ static int add_transaction_credits(journal_t *journal, int blocks,
 	if (t->t_state != T_RUNNING) {
 		WARN_ON_ONCE(t->t_state >= T_FLUSH);
 		wait_transaction_locked(journal);
+		__acquire(&journal->j_state_lock); /* fake out sparse */
 		return 1;
 	}
 
@@ -266,10 +273,12 @@ static int add_transaction_credits(journal_t *journal, int blocks,
 			wait_event(journal->j_wait_reserved,
 				   atomic_read(&journal->j_reserved_credits) + total <=
 				   journal->j_max_transaction_buffers);
+			__acquire(&journal->j_state_lock); /* fake out sparse */
 			return 1;
 		}
 
 		wait_transaction_locked(journal);
+		__acquire(&journal->j_state_lock); /* fake out sparse */
 		return 1;
 	}
 
@@ -293,6 +302,7 @@ static int add_transaction_credits(journal_t *journal, int blocks,
 					journal->j_max_transaction_buffers)
 			__jbd2_log_wait_for_space(journal);
 		write_unlock(&journal->j_state_lock);
+		__acquire(&journal->j_state_lock); /* fake out sparse */
 		return 1;
 	}
 
@@ -310,6 +320,7 @@ static int add_transaction_credits(journal_t *journal, int blocks,
 		wait_event(journal->j_wait_reserved,
 			 atomic_read(&journal->j_reserved_credits) + rsv_blocks
 			 <= journal->j_max_transaction_buffers / 2);
+		__acquire(&journal->j_state_lock); /* fake out sparse */
 		return 1;
 	}
 	return 0;
@@ -413,8 +424,14 @@ static int start_this_handle(journal_t *journal, handle_t *handle,
 
 	if (!handle->h_reserved) {
 		/* We may have dropped j_state_lock - restart in that case */
-		if (add_transaction_credits(journal, blocks, rsv_blocks))
+		if (add_transaction_credits(journal, blocks, rsv_blocks)) {
+			/*
+			 * add_transaction_credits releases
+			 * j_state_lock on a non-zero return
+			 */
+			__release(&journal->j_state_lock);
 			goto repeat;
+		}
 	} else {
 		/*
 		 * We have handle reserved so we are allowed to join T_LOCKED
-- 
2.31.0