f2fs: enable extent cache for compression files in read-only

mainline inclusion
from mainline-v5.19
commit 4215d054
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5XX1X
CVE: NA

-----------------

Let's allow extent cache for RO partition.
Signed-off-by: NDaeho Jeong <daehojeong@google.com>
Reviewed-by: NChao Yu <chao@kernel.org>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: NGeuws <1319579758@qq.com>

fs/f2fs/f2fs.h

@@ -166,6 +166,7 @@ struct f2fs_mount_info {
 #define F2FS_FEATURE_SB_CHKSUM		0x0800
 #define F2FS_FEATURE_CASEFOLD		0x1000
 #define F2FS_FEATURE_COMPRESSION	0x2000
+#define F2FS_FEATURE_RO			0x4000
 
 #define __F2FS_HAS_FEATURE(raw_super, mask)				\
 	((raw_super->feature & cpu_to_le32(mask)) != 0)
@@ -2931,25 +2932,6 @@ static inline bool is_dot_dotdot(const u8 *name, size_t len)
 	return false;
 }
 
-static inline bool f2fs_may_extent_tree(struct inode *inode)
-{
-	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
-
-	if (!test_opt(sbi, EXTENT_CACHE) ||
-			is_inode_flag_set(inode, FI_NO_EXTENT) ||
-			is_inode_flag_set(inode, FI_COMPRESSED_FILE))
-		return false;
-
-	/*
-	 * for recovered files during mount do not create extents
-	 * if shrinker is not registered.
-	 */
-	if (list_empty(&sbi->s_list))
-		return false;
-
-	return S_ISREG(inode->i_mode);
-}
-
 static inline void *f2fs_kmalloc(struct f2fs_sb_info *sbi,
 					size_t size, gfp_t flags)
 {
@@ -3937,6 +3919,27 @@ F2FS_FEATURE_FUNCS(verity, VERITY);
 F2FS_FEATURE_FUNCS(sb_chksum, SB_CHKSUM);
 F2FS_FEATURE_FUNCS(casefold, CASEFOLD);
 F2FS_FEATURE_FUNCS(compression, COMPRESSION);
+F2FS_FEATURE_FUNCS(readonly, RO);
+
+static inline bool f2fs_may_extent_tree(struct inode *inode)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+
+	if (!test_opt(sbi, EXTENT_CACHE) ||
+			is_inode_flag_set(inode, FI_NO_EXTENT) ||
+			(is_inode_flag_set(inode, FI_COMPRESSED_FILE) &&
+			 !f2fs_sb_has_readonly(sbi)))
+		return false;
+
+	/*
+	 * for recovered files during mount do not create extents
+	 * if shrinker is not registered.
+	 */
+	if (list_empty(&sbi->s_list))
+		return false;
+
+	return S_ISREG(inode->i_mode);
+}
 
 #ifdef CONFIG_BLK_DEV_ZONED
 static inline bool f2fs_blkz_is_seq(struct f2fs_sb_info *sbi, int devi,