[PATCH v2 5/8] ext2: annotate ext2_init_block_alloc_info() as requiring truncate_mutex

[Timothy Day <timday@thelustrecollective.com>]

ext2_init_block_alloc_info() sets up the inode's block reservation info
and is already documented as needing truncate_mutex protection. Express
that with __must_hold() for Clang's context analysis.

Both callers (ext2_get_blocks() and ext2_ioctl()) already hold
truncate_mutex.

Signed-off-by: Timothy Day <timday@thelustrecollective.com>
---
 fs/ext2/balloc.c | 1 +
 fs/ext2/ext2.h   | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
index adf0f31fbddd..53c91cb38bde 100644
--- a/fs/ext2/balloc.c
+++ b/fs/ext2/balloc.c
@@ -414,6 +414,7 @@ static inline int rsv_is_empty(struct ext2_reserve_window *rsv)
  * Needs truncate_mutex protection prior to calling this function.
  */
 void ext2_init_block_alloc_info(struct inode *inode)
+	__must_hold(&EXT2_I(inode)->truncate_mutex)
 {
 	struct ext2_inode_info *ei = EXT2_I(inode);
 	struct ext2_block_alloc_info *block_i;
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index 4c30d6f5c972..b6ae29b2e6ec 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -710,7 +710,8 @@ extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
 						    struct buffer_head ** bh);
 extern void ext2_discard_reservation (struct inode *);
 extern int ext2_should_retry_alloc(struct super_block *sb, int *retries);
-extern void ext2_init_block_alloc_info(struct inode *);
+extern void ext2_init_block_alloc_info(struct inode *inode)
+	__must_hold(&EXT2_I(inode)->truncate_mutex);
 extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);
 
 /* dir.c */
-- 
2.43.0