[PATCH v2 08/19] ext4: get block from bh before pass it to ext4_free_blocks_simple in ext4_free_blocks

Kemeng Shi
2023-04-12T09:26:48Z

ext4_free_blocks will retrieve block from bh if block parameter is zero.
Retrieve block before ext4_free_blocks_simple to avoid potentially
passing wrong block to ext4_free_blocks_simple.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
---
fs/ext4/mballoc.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index b9a7b669b97d..ca11d0aa8a59 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -6117,12 +6117,6 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode,

sbi = EXT4_SB(sb);

- if (sbi->s_mount_state & EXT4_FC_REPLAY) {
- ext4_free_blocks_simple(inode, block, count);
- return;
- }
-
- might_sleep();
if (bh) {
if (block)
BUG_ON(block != bh->b_blocknr);
@@ -6130,6 +6124,13 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode,
block = bh->b_blocknr;
}

+ if (sbi->s_mount_state & EXT4_FC_REPLAY) {
+ ext4_free_blocks_simple(inode, block, count);
+ return;
+ }
+
+ might_sleep();
+
if (!(flags & EXT4_FREE_BLOCKS_VALIDATED) &&
!ext4_inode_block_valid(inode, block, count)) {
ext4_error(sb, "Freeing blocks not in datazone - "
--
2.30.0