Commit d65d87a0 authored by Theodore Ts'o's avatar Theodore Ts'o

ext4: improve explanation of a mount failure caused by a misconfigured kernel

If CONFIG_QFMT_V2 is not enabled, but CONFIG_QUOTA is enabled, when a
user tries to mount a file system with the quota or project quota
enabled, the kernel will emit a very confusing messsage:

    EXT4-fs warning (device vdc): ext4_enable_quotas:5914: Failed to enable quota tracking (type=0, err=-3). Please run e2fsck to fix.
    EXT4-fs (vdc): mount failed

We will now report an explanatory message indicating which kernel
configuration options have to be enabled, to avoid customer/sysadmin

Google-Bug-Id: 149093531
Fixes: 7c319d32 ("ext4: make quota as first class supported feature")
Signed-off-by: default avatarTheodore Ts'o <>
parent c96dceea
......@@ -3009,17 +3009,11 @@ static int ext4_feature_set_ok(struct super_block *sb, int readonly)
return 0;
if (ext4_has_feature_quota(sb) && !readonly) {
#if !defined(CONFIG_QUOTA) || !defined(CONFIG_QFMT_V2)
if (!readonly && (ext4_has_feature_quota(sb) ||
ext4_has_feature_project(sb))) {
ext4_msg(sb, KERN_ERR,
"Filesystem with quota feature cannot be mounted RDWR "
"without CONFIG_QUOTA");
return 0;
if (ext4_has_feature_project(sb) && !readonly) {
ext4_msg(sb, KERN_ERR,
"Filesystem with project quota feature cannot be mounted RDWR "
"without CONFIG_QUOTA");
"The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");
return 0;
#endif /* CONFIG_QUOTA */
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