[kbuild-all] fs/ext4/ioctl.c:45:5: warning: no previous prototype for 'ext4_modify_primary_sb'

tree: https://github.com/0day-ci/linux/commits/UPDATE-20211210-231726/Lukas-Cze... head: 3645884240a4d5f00133b71e3a7fbb2070588706 commit: 3645884240a4d5f00133b71e3a7fbb2070588706 ext4: implement support for get/set fs label date: 4 hours ago config: arc-randconfig-r043-20211210 (https://download.01.org/0day-ci/archive/20211211/202112110218.jAfqs4kb-lk...) compiler: arc-elf-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/3645884240a4d5f00133b71e3a7fbb207... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review UPDATE-20211210-231726/Lukas-Czerner/ext4-implement-support-for-get-set-fs-label/20211112-060030 git checkout 3645884240a4d5f00133b71e3a7fbb2070588706 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash fs/ext4/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): 45 | int ext4_modify_primary_sb(struct super_block *sb, handle_t *handle, | ^~~~~~~~~~~~~~~~~~~~~~ 165 | int ext4_modify_superblocks_fn(struct super_block *sb, | ^~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/ext4_modify_primary_sb +45 fs/ext4/ioctl.c 44 46 ext4_modify_sb_callback func, 47 const void *arg) 48 { 49 int err = 0; 50 struct ext4_sb_info *sbi = EXT4_SB(sb); 51 struct buffer_head *bh = sbi->s_sbh; 52 struct ext4_super_block *es = sbi->s_es; 53 54 trace_ext4_modify_sb(sb, bh->b_blocknr, 1); 55 56 BUFFER_TRACE(bh, "get_write_access"); 57 err = ext4_journal_get_write_access(handle, sb, 58 bh, 59 EXT4_JTR_NONE); 60 if (err) 61 goto out_err; 62 63 lock_buffer(bh); 64 func(es, arg); 65 ext4_superblock_csum_set(sb); 66 unlock_buffer(bh); 67 68 if (buffer_write_io_error(bh) || !buffer_uptodate(bh)) { 69 ext4_msg(sbi->s_sb, KERN_ERR, "previous I/O error to " 70 "superblock detected"); 71 clear_buffer_write_io_error(bh); 72 set_buffer_uptodate(bh); 73 } 74 75 err = ext4_handle_dirty_metadata(handle, NULL, bh); 76 if (err) 77 goto out_err; 78 err = sync_dirty_buffer(bh); 79 out_err: 80 ext4_std_error(sb, err); 81 return err; 82 } 83 84 /* 85 * Update one backup superblcok in the group 'grp' using the primary 86 * superblock data. If the handle is NULL the modification is not 87 * journalled. 88 * 89 * Returns: 0 when no modification was done (no superblock in the group) 90 * 1 when the modification was successful 91 * <0 on error 92 */ 93 static int ext4_update_backup_sb(struct super_block *sb, handle_t *handle, 94 ext4_group_t grp) 95 { 96 int err = 0; 97 ext4_fsblk_t sb_block; 98 struct buffer_head *bh; 99 unsigned long offset = 0; 100 101 if (!ext4_bg_has_super(sb, grp)) 102 return 0; 103 104 /* 105 * For the group 0 there is always 1k padding, so we have 106 * either adjust offset, or sb_block depending on blocksize 107 */ 108 if (grp == 0) { 109 sb_block = 1 * EXT4_MIN_BLOCK_SIZE; 110 offset = do_div(sb_block, sb->s_blocksize); 111 } else { 112 sb_block = ext4_group_first_block_no(sb, grp); 113 offset = 0; 114 } 115 116 trace_ext4_modify_sb(sb, sb_block, handle ? 1 : 0); 117 118 bh = sb_getblk(sb, sb_block); 119 if (IS_ERR(bh)) 120 return PTR_ERR(bh); 121 122 if (handle) { 123 BUFFER_TRACE(bh, "get_write_access"); 124 err = ext4_journal_get_write_access(handle, sb, 125 bh, 126 EXT4_JTR_NONE); 127 if (err) 128 goto out_bh; 129 } 130 131 lock_buffer(bh); 132 memcpy(bh->b_data + offset, EXT4_SB(sb)->s_es, 133 sizeof(struct ext4_super_block)); 134 set_buffer_uptodate(bh); 135 unlock_buffer(bh); 136 137 if (err) 138 goto out_bh; 139 140 if (handle) { 141 err = ext4_handle_dirty_metadata(handle, NULL, bh); 142 if (err) 143 goto out_bh; 144 } else { 145 BUFFER_TRACE(bh, "marking dirty"); 146 mark_buffer_dirty(bh); 147 } 148 err = sync_dirty_buffer(bh); 149 150 out_bh: 151 brelse(bh); 152 ext4_std_error(sb, err); 153 return (err) ? err : 1; 154 } 155 156 /* 157 * Modify primary and backup superblocks using the provided function 158 * func and argument arg. 159 * 160 * Only the primary superblock and at most two backup superblock 161 * modifications are journalled; the rest is modified without journal. 162 * This is safe because e2fsck will re-write them if there is a problem, 163 * and we're very unlikely to ever need more than two backups. 164 */ 166 ext4_modify_sb_callback func, 167 const void *arg) 168 { 169 handle_t *handle; 170 ext4_group_t ngroups; 171 unsigned int three = 1; 172 unsigned int five = 5; 173 unsigned int seven = 7; 174 int err = 0, ret, i; 175 ext4_group_t grp, primary_grp; 176 struct ext4_sb_info *sbi = EXT4_SB(sb); 177 178 /* 179 * We can't modify superblocks while the online resize is running 180 */ 181 if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING, 182 &sbi->s_ext4_flags)) { 183 ext4_msg(sb, KERN_ERR, "Can't modify superblock while" 184 "performing online resize"); 185 return -EBUSY; 186 } 187 188 /* 189 * We're only going to modify primary superblock and two 190 * backup superblocks in this transaction. 191 */ 192 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 3); 193 if (IS_ERR(handle)) { 194 err = PTR_ERR(handle); 195 goto out; 196 } 197 198 /* Modify primary superblock */ 199 err = ext4_modify_primary_sb(sb, handle, func, arg); 200 if (err) { 201 ext4_msg(sb, KERN_ERR, "Failed to modify primary " 202 "superblock"); 203 goto out_journal; 204 } 205 206 primary_grp = ext4_get_group_number(sb, sbi->s_sbh->b_blocknr); 207 ngroups = ext4_get_groups_count(sb); 208 209 /* 210 * Update backup superblocks. We have to start from group 0 211 * because it might not be where the primary superblock is 212 * if the fs is mounted with -o sb=<backup_sb_block> 213 */ 214 i = 0; 215 grp = 0; 216 while (grp < ngroups) { 217 /* Skip primary superblock */ 218 if (grp == primary_grp) 219 goto next_grp; 220 221 ret = ext4_update_backup_sb(sb, handle, grp); 222 if (ret < 0) { 223 err = ret; 224 goto out_journal; 225 } 226 227 i += ret; 228 if (handle && i > 1) { 229 /* 230 * We're only journalling primary superblock and 231 * two backup superblocks; the rest is not 232 * journalled. 233 */ 234 err = ext4_journal_stop(handle); 235 if (err) 236 goto out; 237 handle = NULL; 238 } 239 next_grp: 240 grp = ext4_list_backups(sb, &three, &five, &seven); 241 } 242 243 out_journal: 244 if (handle) { 245 ret = ext4_journal_stop(handle); 246 if (ret && !err) 247 err = ret; 248 } 249 out: 250 clear_bit_unlock(EXT4_FLAGS_RESIZING, &sbi->s_ext4_flags); 251 smp_mb__after_atomic(); 252 return err ? err : 0; 253 } 254 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org