Commit d65d87a0 authored Feb 14, 2020 by 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
confusion.

Link: https://lore.kernel.org/r/20200215012738.565735-1-tytso@mit.edu


Google-Bug-Id: 149093531
Fixes: 7c319d32 ("ext4: make quota as first class supported feature")
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org

parent c96dceea

fs/ext4/super.c

+4 −10

Original line number	Diff line number	Diff line
		@@ -3009,17 +3009,11 @@ static int ext4_feature_set_ok(struct super_block *sb, int readonly)
		return 0;
		}

		#ifndef CONFIG_QUOTA
		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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