f2fs: only set project inherit bit for directory

It doesn't make any sense to have project inherit bits
for regular files, even though this won't cause any
problem, but it is better fix this.

Cc: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Wang Shilong <wshilong@ddn.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/f2fs.h

@@ -2350,7 +2350,7 @@ static inline void f2fs_change_bit(unsigned int nr, char *addr)
 			   F2FS_DIRSYNC_FL | F2FS_PROJINHERIT_FL)
 
 /* Flags that are appropriate for regular files (all but dir-specific ones). */
-#define F2FS_REG_FLMASK		(~F2FS_DIRSYNC_FL)
+#define F2FS_REG_FLMASK		(~(F2FS_DIRSYNC_FL | F2FS_PROJINHERIT_FL))
 
 /* Flags that are appropriate for non-directories/regular files. */
 #define F2FS_OTHER_FLMASK	(F2FS_NODUMP_FL | F2FS_NOATIME_FL)

fs/f2fs/inode.c

@@ -343,6 +343,8 @@ static int do_read_inode(struct inode *inode)
 					le16_to_cpu(ri->i_gc_failures);
 	fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);
 	fi->i_flags = le32_to_cpu(ri->i_flags);
+	if (S_ISREG(inode->i_mode))
+		fi->i_flags &= ~F2FS_PROJINHERIT_FL;
 	fi->flags = 0;
 	fi->i_advise = ri->i_advise;
 	fi->i_pino = le32_to_cpu(ri->i_pino);