[PATCH v4 3/6] f2fs: compress: fix to check unreleased compressed cluster

[Chao Yu]

From: Sheng Yong <shengyong@xxxxxxxx>

Compressed cluster may not be released due to we can fail in
release_compress_blocks(), fix to handle reserved compressed
cluster correctly in reserve_compress_blocks().

Fixes: 4c8ff7095bef ("f2fs: support data compression")
Signed-off-by: Sheng Yong <shengyong@xxxxxxxx>
Signed-off-by: Chao Yu <chao@xxxxxxxxxx>
---
v4:
- merge check condition suggested by Daeho.
 fs/f2fs/file.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 026d05a7edd8..80d9c4c096f0 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3624,7 +3624,13 @@ static int reserve_compress_blocks(struct dnode_of_data *dn, pgoff_t count)
 				goto next;
 			}
 
-			if (__is_valid_data_blkaddr(blkaddr)) {
+			/*
+			 * compressed cluster was not released due to it
+			 * fails in release_compress_blocks(), so NEW_ADDR
+			 * is a possible case.
+			 */
+			if (blkaddr == NEW_ADDR ||
+				__is_valid_data_blkaddr(blkaddr)) {
 				compr_blocks++;
 				continue;
 			}
@@ -3633,6 +3639,9 @@ static int reserve_compress_blocks(struct dnode_of_data *dn, pgoff_t count)
 		}
 
 		reserved = cluster_size - compr_blocks;
+		if (!reserved)
+			goto next;
+
 		ret = inc_valid_block_count(sbi, dn->inode, &reserved);
 		if (ret)
 			return ret;
-- 
2.40.1