Hi Lizhi,
kernel test robot noticed the following build warnings:
[auto build test WARNING on tytso-ext4/dev]
[also build test WARNING on netfilter-nf/main linus/master v6.10-rc1 next-20240529]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Lizhi-Xu/ext4-add-casefolded-feature-check-before-setup-encrypted-info/20240531-111129
base: https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
patch link: https://lore.kernel.org/r/20240531030740.1024475-1-lizhi.xu%40windriver.com
patch subject: [PATCH V2] ext4: add casefolded feature check before setup encrypted info
config: riscv-defconfig (https://download.01.org/0day-ci/archive/20240531/202405311607.yQR7dozp-lkp@xxxxxxxxx/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project bafda89a0944d947fc4b3b5663185e07a397ac30)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240531/202405311607.yQR7dozp-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405311607.yQR7dozp-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
In file included from fs/ext4/ialloc.c:21:
In file included from include/linux/buffer_head.h:12:
In file included from include/linux/blk_types.h:10:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:8:
In file included from include/linux/cacheflush.h:5:
In file included from arch/riscv/include/asm/cacheflush.h:9:
In file included from include/linux/mm.h:2208:
include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
522 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
| ~~~~~~~~~~~ ^ ~~~
>> fs/ext4/ialloc.c:986:7: warning: variable 'err' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
986 | if (ext4_has_feature_casefold(inode->i_sb))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/ext4/ialloc.c:988:7: note: uninitialized use occurs here
988 | if (err)
| ^~~
fs/ext4/ialloc.c:986:3: note: remove the 'if' if its condition is always true
986 | if (ext4_has_feature_casefold(inode->i_sb))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
987 | err = fscrypt_prepare_new_inode(dir, inode, &encrypt);
fs/ext4/ialloc.c:939:15: note: initialize the variable 'err' to silence this warning
939 | int ret2, err;
| ^
| = 0
2 warnings generated.
vim +986 fs/ext4/ialloc.c
912
913 /*
914 * There are two policies for allocating an inode. If the new inode is
915 * a directory, then a forward search is made for a block group with both
916 * free space and a low directory-to-inode ratio; if that fails, then of
917 * the groups with above-average free space, that group with the fewest
918 * directories already is chosen.
919 *
920 * For other inodes, search forward from the parent directory's block
921 * group to find a free inode.
922 */
923 struct inode *__ext4_new_inode(struct mnt_idmap *idmap,
924 handle_t *handle, struct inode *dir,
925 umode_t mode, const struct qstr *qstr,
926 __u32 goal, uid_t *owner, __u32 i_flags,
927 int handle_type, unsigned int line_no,
928 int nblocks)
929 {
930 struct super_block *sb;
931 struct buffer_head *inode_bitmap_bh = NULL;
932 struct buffer_head *group_desc_bh;
933 ext4_group_t ngroups, group = 0;
934 unsigned long ino = 0;
935 struct inode *inode;
936 struct ext4_group_desc *gdp = NULL;
937 struct ext4_inode_info *ei;
938 struct ext4_sb_info *sbi;
939 int ret2, err;
940 struct inode *ret;
941 ext4_group_t i;
942 ext4_group_t flex_group;
943 struct ext4_group_info *grp = NULL;
944 bool encrypt = false;
945
946 /* Cannot create files in a deleted directory */
947 if (!dir || !dir->i_nlink)
948 return ERR_PTR(-EPERM);
949
950 sb = dir->i_sb;
951 sbi = EXT4_SB(sb);
952
953 if (unlikely(ext4_forced_shutdown(sb)))
954 return ERR_PTR(-EIO);
955
956 ngroups = ext4_get_groups_count(sb);
957 trace_ext4_request_inode(dir, mode);
958 inode = new_inode(sb);
959 if (!inode)
960 return ERR_PTR(-ENOMEM);
961 ei = EXT4_I(inode);
962
963 /*
964 * Initialize owners and quota early so that we don't have to account
965 * for quota initialization worst case in standard inode creating
966 * transaction
967 */
968 if (owner) {
969 inode->i_mode = mode;
970 i_uid_write(inode, owner[0]);
971 i_gid_write(inode, owner[1]);
972 } else if (test_opt(sb, GRPID)) {
973 inode->i_mode = mode;
974 inode_fsuid_set(inode, idmap);
975 inode->i_gid = dir->i_gid;
976 } else
977 inode_init_owner(idmap, inode, dir, mode);
978
979 if (ext4_has_feature_project(sb) &&
980 ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT))
981 ei->i_projid = EXT4_I(dir)->i_projid;
982 else
983 ei->i_projid = make_kprojid(&init_user_ns, EXT4_DEF_PROJID);
984
985 if (!(i_flags & EXT4_EA_INODE_FL)) {
> 986 if (ext4_has_feature_casefold(inode->i_sb))
987 err = fscrypt_prepare_new_inode(dir, inode, &encrypt);
988 if (err)
989 goto out;
990 }
991
992 err = dquot_initialize(inode);
993 if (err)
994 goto out;
995
996 if (!handle && sbi->s_journal && !(i_flags & EXT4_EA_INODE_FL)) {
997 ret2 = ext4_xattr_credits_for_new_inode(dir, mode, encrypt);
998 if (ret2 < 0) {
999 err = ret2;
1000 goto out;
1001 }
1002 nblocks += ret2;
1003 }
1004
1005 if (!goal)
1006 goal = sbi->s_inode_goal;
1007
1008 if (goal && goal <= le32_to_cpu(sbi->s_es->s_inodes_count)) {
1009 group = (goal - 1) / EXT4_INODES_PER_GROUP(sb);
1010 ino = (goal - 1) % EXT4_INODES_PER_GROUP(sb);
1011 ret2 = 0;
1012 goto got_group;
1013 }
1014
1015 if (S_ISDIR(mode))
1016 ret2 = find_group_orlov(sb, dir, &group, mode, qstr);
1017 else
1018 ret2 = find_group_other(sb, dir, &group, mode);
1019
1020 got_group:
1021 EXT4_I(dir)->i_last_alloc_group = group;
1022 err = -ENOSPC;
1023 if (ret2 == -1)
1024 goto out;
1025
1026 /*
1027 * Normally we will only go through one pass of this loop,
1028 * unless we get unlucky and it turns out the group we selected
1029 * had its last inode grabbed by someone else.
1030 */
1031 for (i = 0; i < ngroups; i++, ino = 0) {
1032 err = -EIO;
1033
1034 gdp = ext4_get_group_desc(sb, group, &group_desc_bh);
1035 if (!gdp)
1036 goto out;
1037
1038 /*
1039 * Check free inodes count before loading bitmap.
1040 */
1041 if (ext4_free_inodes_count(sb, gdp) == 0)
1042 goto next_group;
1043
1044 if (!(sbi->s_mount_state & EXT4_FC_REPLAY)) {
1045 grp = ext4_get_group_info(sb, group);
1046 /*
1047 * Skip groups with already-known suspicious inode
1048 * tables
1049 */
1050 if (!grp || EXT4_MB_GRP_IBITMAP_CORRUPT(grp))
1051 goto next_group;
1052 }
1053
1054 brelse(inode_bitmap_bh);
1055 inode_bitmap_bh = ext4_read_inode_bitmap(sb, group);
1056 /* Skip groups with suspicious inode tables */
1057 if (((!(sbi->s_mount_state & EXT4_FC_REPLAY))
1058 && EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) ||
1059 IS_ERR(inode_bitmap_bh)) {
1060 inode_bitmap_bh = NULL;
1061 goto next_group;
1062 }
1063
1064 repeat_in_this_group:
1065 ret2 = find_inode_bit(sb, group, inode_bitmap_bh, &ino);
1066 if (!ret2)
1067 goto next_group;
1068
1069 if (group == 0 && (ino + 1) < EXT4_FIRST_INO(sb)) {
1070 ext4_error(sb, "reserved inode found cleared - "
1071 "inode=%lu", ino + 1);
1072 ext4_mark_group_bitmap_corrupted(sb, group,
1073 EXT4_GROUP_INFO_IBITMAP_CORRUPT);
1074 goto next_group;
1075 }
1076
1077 if ((!(sbi->s_mount_state & EXT4_FC_REPLAY)) && !handle) {
1078 BUG_ON(nblocks <= 0);
1079 handle = __ext4_journal_start_sb(NULL, dir->i_sb,
1080 line_no, handle_type, nblocks, 0,
1081 ext4_trans_default_revoke_credits(sb));
1082 if (IS_ERR(handle)) {
1083 err = PTR_ERR(handle);
1084 ext4_std_error(sb, err);
1085 goto out;
1086 }
1087 }
1088 BUFFER_TRACE(inode_bitmap_bh, "get_write_access");
1089 err = ext4_journal_get_write_access(handle, sb, inode_bitmap_bh,
1090 EXT4_JTR_NONE);
1091 if (err) {
1092 ext4_std_error(sb, err);
1093 goto out;
1094 }
1095 ext4_lock_group(sb, group);
1096 ret2 = ext4_test_and_set_bit(ino, inode_bitmap_bh->b_data);
1097 if (ret2) {
1098 /* Someone already took the bit. Repeat the search
1099 * with lock held.
1100 */
1101 ret2 = find_inode_bit(sb, group, inode_bitmap_bh, &ino);
1102 if (ret2) {
1103 ext4_set_bit(ino, inode_bitmap_bh->b_data);
1104 ret2 = 0;
1105 } else {
1106 ret2 = 1; /* we didn't grab the inode */
1107 }
1108 }
1109 ext4_unlock_group(sb, group);
1110 ino++; /* the inode bitmap is zero-based */
1111 if (!ret2)
1112 goto got; /* we grabbed the inode! */
1113
1114 if (ino < EXT4_INODES_PER_GROUP(sb))
1115 goto repeat_in_this_group;
1116 next_group:
1117 if (++group == ngroups)
1118 group = 0;
1119 }
1120 err = -ENOSPC;
1121 goto out;
1122
1123 got:
1124 BUFFER_TRACE(inode_bitmap_bh, "call ext4_handle_dirty_metadata");
1125 err = ext4_handle_dirty_metadata(handle, NULL, inode_bitmap_bh);
1126 if (err) {
1127 ext4_std_error(sb, err);
1128 goto out;
1129 }
1130
1131 BUFFER_TRACE(group_desc_bh, "get_write_access");
1132 err = ext4_journal_get_write_access(handle, sb, group_desc_bh,
1133 EXT4_JTR_NONE);
1134 if (err) {
1135 ext4_std_error(sb, err);
1136 goto out;
1137 }
1138
1139 /* We may have to initialize the block bitmap if it isn't already */
1140 if (ext4_has_group_desc_csum(sb) &&
1141 gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
1142 struct buffer_head *block_bitmap_bh;
1143
1144 block_bitmap_bh = ext4_read_block_bitmap(sb, group);
1145 if (IS_ERR(block_bitmap_bh)) {
1146 err = PTR_ERR(block_bitmap_bh);
1147 goto out;
1148 }
1149 BUFFER_TRACE(block_bitmap_bh, "get block bitmap access");
1150 err = ext4_journal_get_write_access(handle, sb, block_bitmap_bh,
1151 EXT4_JTR_NONE);
1152 if (err) {
1153 brelse(block_bitmap_bh);
1154 ext4_std_error(sb, err);
1155 goto out;
1156 }
1157
1158 BUFFER_TRACE(block_bitmap_bh, "dirty block bitmap");
1159 err = ext4_handle_dirty_metadata(handle, NULL, block_bitmap_bh);
1160
1161 /* recheck and clear flag under lock if we still need to */
1162 ext4_lock_group(sb, group);
1163 if (ext4_has_group_desc_csum(sb) &&
1164 (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT))) {
1165 gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT);
1166 ext4_free_group_clusters_set(sb, gdp,
1167 ext4_free_clusters_after_init(sb, group, gdp));
1168 ext4_block_bitmap_csum_set(sb, gdp, block_bitmap_bh);
1169 ext4_group_desc_csum_set(sb, group, gdp);
1170 }
1171 ext4_unlock_group(sb, group);
1172 brelse(block_bitmap_bh);
1173
1174 if (err) {
1175 ext4_std_error(sb, err);
1176 goto out;
1177 }
1178 }
1179
1180 /* Update the relevant bg descriptor fields */
1181 if (ext4_has_group_desc_csum(sb)) {
1182 int free;
1183 struct ext4_group_info *grp = NULL;
1184
1185 if (!(sbi->s_mount_state & EXT4_FC_REPLAY)) {
1186 grp = ext4_get_group_info(sb, group);
1187 if (!grp) {
1188 err = -EFSCORRUPTED;
1189 goto out;
1190 }
1191 down_read(&grp->alloc_sem); /*
1192 * protect vs itable
1193 * lazyinit
1194 */
1195 }
1196 ext4_lock_group(sb, group); /* while we modify the bg desc */
1197 free = EXT4_INODES_PER_GROUP(sb) -
1198 ext4_itable_unused_count(sb, gdp);
1199 if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) {
1200 gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT);
1201 free = 0;
1202 }
1203 /*
1204 * Check the relative inode number against the last used
1205 * relative inode number in this group. if it is greater
1206 * we need to update the bg_itable_unused count
1207 */
1208 if (ino > free)
1209 ext4_itable_unused_set(sb, gdp,
1210 (EXT4_INODES_PER_GROUP(sb) - ino));
1211 if (!(sbi->s_mount_state & EXT4_FC_REPLAY))
1212 up_read(&grp->alloc_sem);
1213 } else {
1214 ext4_lock_group(sb, group);
1215 }
1216
1217 ext4_free_inodes_set(sb, gdp, ext4_free_inodes_count(sb, gdp) - 1);
1218 if (S_ISDIR(mode)) {
1219 ext4_used_dirs_set(sb, gdp, ext4_used_dirs_count(sb, gdp) + 1);
1220 if (sbi->s_log_groups_per_flex) {
1221 ext4_group_t f = ext4_flex_group(sbi, group);
1222
1223 atomic_inc(&sbi_array_rcu_deref(sbi, s_flex_groups,
1224 f)->used_dirs);
1225 }
1226 }
1227 if (ext4_has_group_desc_csum(sb)) {
1228 ext4_inode_bitmap_csum_set(sb, gdp, inode_bitmap_bh,
1229 EXT4_INODES_PER_GROUP(sb) / 8);
1230 ext4_group_desc_csum_set(sb, group, gdp);
1231 }
1232 ext4_unlock_group(sb, group);
1233
1234 BUFFER_TRACE(group_desc_bh, "call ext4_handle_dirty_metadata");
1235 err = ext4_handle_dirty_metadata(handle, NULL, group_desc_bh);
1236 if (err) {
1237 ext4_std_error(sb, err);
1238 goto out;
1239 }
1240
1241 percpu_counter_dec(&sbi->s_freeinodes_counter);
1242 if (S_ISDIR(mode))
1243 percpu_counter_inc(&sbi->s_dirs_counter);
1244
1245 if (sbi->s_log_groups_per_flex) {
1246 flex_group = ext4_flex_group(sbi, group);
1247 atomic_dec(&sbi_array_rcu_deref(sbi, s_flex_groups,
1248 flex_group)->free_inodes);
1249 }
1250
1251 inode->i_ino = ino + group * EXT4_INODES_PER_GROUP(sb);
1252 /* This is the optimal IO size (for stat), not the fs block size */
1253 inode->i_blocks = 0;
1254 simple_inode_init_ts(inode);
1255 ei->i_crtime = inode_get_mtime(inode);
1256
1257 memset(ei->i_data, 0, sizeof(ei->i_data));
1258 ei->i_dir_start_lookup = 0;
1259 ei->i_disksize = 0;
1260
1261 /* Don't inherit extent flag from directory, amongst others. */
1262 ei->i_flags =
1263 ext4_mask_flags(mode, EXT4_I(dir)->i_flags & EXT4_FL_INHERITED);
1264 ei->i_flags |= i_flags;
1265 ei->i_file_acl = 0;
1266 ei->i_dtime = 0;
1267 ei->i_block_group = group;
1268 ei->i_last_alloc_group = ~0;
1269
1270 ext4_set_inode_flags(inode, true);
1271 if (IS_DIRSYNC(inode))
1272 ext4_handle_sync(handle);
1273 if (insert_inode_locked(inode) < 0) {
1274 /*
1275 * Likely a bitmap corruption causing inode to be allocated
1276 * twice.
1277 */
1278 err = -EIO;
1279 ext4_error(sb, "failed to insert inode %lu: doubly allocated?",
1280 inode->i_ino);
1281 ext4_mark_group_bitmap_corrupted(sb, group,
1282 EXT4_GROUP_INFO_IBITMAP_CORRUPT);
1283 goto out;
1284 }
1285 inode->i_generation = get_random_u32();
1286
1287 /* Precompute checksum seed for inode metadata */
1288 if (ext4_has_metadata_csum(sb)) {
1289 __u32 csum;
1290 __le32 inum = cpu_to_le32(inode->i_ino);
1291 __le32 gen = cpu_to_le32(inode->i_generation);
1292 csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum,
1293 sizeof(inum));
1294 ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen,
1295 sizeof(gen));
1296 }
1297
1298 ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */
1299 ext4_set_inode_state(inode, EXT4_STATE_NEW);
1300
1301 ei->i_extra_isize = sbi->s_want_extra_isize;
1302 ei->i_inline_off = 0;
1303 if (ext4_has_feature_inline_data(sb) &&
1304 (!(ei->i_flags & EXT4_DAX_FL) || S_ISDIR(mode)))
1305 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1306 ret = inode;
1307 err = dquot_alloc_inode(inode);
1308 if (err)
1309 goto fail_drop;
1310
1311 /*
1312 * Since the encryption xattr will always be unique, create it first so
1313 * that it's less likely to end up in an external xattr block and
1314 * prevent its deduplication.
1315 */
1316 if (encrypt) {
1317 err = fscrypt_set_context(inode, handle);
1318 if (err)
1319 goto fail_free_drop;
1320 }
1321
1322 if (!(ei->i_flags & EXT4_EA_INODE_FL)) {
1323 err = ext4_init_acl(handle, inode, dir);
1324 if (err)
1325 goto fail_free_drop;
1326
1327 err = ext4_init_security(handle, inode, dir, qstr);
1328 if (err)
1329 goto fail_free_drop;
1330 }
1331
1332 if (ext4_has_feature_extents(sb)) {
1333 /* set extent flag only for directory, file and normal symlink*/
1334 if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) {
1335 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
1336 ext4_ext_tree_init(handle, inode);
1337 }
1338 }
1339
1340 if (ext4_handle_valid(handle)) {
1341 ei->i_sync_tid = handle->h_transaction->t_tid;
1342 ei->i_datasync_tid = handle->h_transaction->t_tid;
1343 }
1344
1345 err = ext4_mark_inode_dirty(handle, inode);
1346 if (err) {
1347 ext4_std_error(sb, err);
1348 goto fail_free_drop;
1349 }
1350
1351 ext4_debug("allocating inode %lu\n", inode->i_ino);
1352 trace_ext4_allocate_inode(inode, dir, mode);
1353 brelse(inode_bitmap_bh);
1354 return ret;
1355
1356 fail_free_drop:
1357 dquot_free_inode(inode);
1358 fail_drop:
1359 clear_nlink(inode);
1360 unlock_new_inode(inode);
1361 out:
1362 dquot_drop(inode);
1363 inode->i_flags |= S_NOQUOTA;
1364 iput(inode);
1365 brelse(inode_bitmap_bh);
1366 return ERR_PTR(err);
1367 }
1368
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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