[chao:dev-test 1/21] fs/f2fs/file.c:1941:37: warning: statement with no effect

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git dev-test
head:   e0494cc29d5285433cd8a5b0d79a84c1e57ca339
commit: ffda111162ddf40c7544c6412ddac9b8494ca3e7 [1/21] f2fs: fix to avoid mmap vs set_compress_option case
config: i386-randconfig-i003-20230625 (https://download.01.org/0day-ci/archive/20230625/202306251856.GIweOxME-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce: (https://download.01.org/0day-ci/archive/20230625/202306251856.GIweOxME-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306251856.GIweOxME-lkp@intel.com/

All warnings (new ones prefixed by >>):

   fs/f2fs/file.c: In function 'f2fs_setflags_common':
>> fs/f2fs/file.c:1941:37: warning: statement with no effect [-Wunused-value]
    1941 |                                 err -EOPNOTSUPP;


vim +1941 fs/f2fs/file.c

  1896	
  1897	static int f2fs_setflags_common(struct inode *inode, u32 iflags, u32 mask)
  1898	{
  1899		struct f2fs_inode_info *fi = F2FS_I(inode);
  1900		u32 masked_flags = fi->i_flags & mask;
  1901	
  1902		/* mask can be shrunk by flags_valid selector */
  1903		iflags &= mask;
  1904	
  1905		/* Is it quota file? Do not allow user to mess with it */
  1906		if (IS_NOQUOTA(inode))
  1907			return -EPERM;
  1908	
  1909		if ((iflags ^ masked_flags) & F2FS_CASEFOLD_FL) {
  1910			if (!f2fs_sb_has_casefold(F2FS_I_SB(inode)))
  1911				return -EOPNOTSUPP;
  1912			if (!f2fs_empty_dir(inode))
  1913				return -ENOTEMPTY;
  1914		}
  1915	
  1916		if (iflags & (F2FS_COMPR_FL | F2FS_NOCOMP_FL)) {
  1917			if (!f2fs_sb_has_compression(F2FS_I_SB(inode)))
  1918				return -EOPNOTSUPP;
  1919			if ((iflags & F2FS_COMPR_FL) && (iflags & F2FS_NOCOMP_FL))
  1920				return -EINVAL;
  1921		}
  1922	
  1923		if ((iflags ^ masked_flags) & F2FS_COMPR_FL) {
  1924			if (masked_flags & F2FS_COMPR_FL) {
  1925				if (!f2fs_disable_compressed_file(inode))
  1926					return -EINVAL;
  1927			} else {
  1928				/* try to convert inline_data to support compression */
  1929				int err = f2fs_convert_inline_inode(inode);
  1930				if (err)
  1931					return err;
  1932	
  1933				f2fs_down_write(&F2FS_I(inode)->i_sem);
  1934				if (!f2fs_may_compress(inode) ||
  1935						(S_ISREG(inode->i_mode) &&
  1936						F2FS_HAS_BLOCKS(inode))) {
  1937					f2fs_up_write(&F2FS_I(inode)->i_sem);
  1938					return -EINVAL;
  1939				}
  1940				if (set_compress_context(inode))
> 1941					err -EOPNOTSUPP;
  1942				f2fs_up_write(&F2FS_I(inode)->i_sem);
  1943	
  1944				if (err)
  1945					return err;
  1946			}
  1947		}
  1948	
  1949		fi->i_flags = iflags | (fi->i_flags & ~mask);
  1950		f2fs_bug_on(F2FS_I_SB(inode), (fi->i_flags & F2FS_COMPR_FL) &&
  1951						(fi->i_flags & F2FS_NOCOMP_FL));
  1952	
  1953		if (fi->i_flags & F2FS_PROJINHERIT_FL)
  1954			set_inode_flag(inode, FI_PROJ_INHERIT);
  1955		else
  1956			clear_inode_flag(inode, FI_PROJ_INHERIT);
  1957	
  1958		inode->i_ctime = current_time(inode);
  1959		f2fs_set_inode_flags(inode);
  1960		f2fs_mark_inode_dirty_sync(inode, true);
  1961		return 0;
  1962	}
  1963	

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