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

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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: 7c319d3285 ("ext4: make quota as first class supported feature")
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
This commit is contained in:
Theodore Ts'o 2020-02-14 18:11:19 -05:00
parent c96dceeabf
commit d65d87a074
1 changed files with 4 additions and 10 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

14
fs/ext4/super.c
View file

@ -3009,17 +3009,11 @@ static int ext4_feature_set_ok(struct super_block *sb, int readonly)
return 0; return 0;
} }
#ifndef CONFIG_QUOTA #if !defined(CONFIG_QUOTA) || !defined(CONFIG_QFMT_V2)
if (ext4_has_feature_quota(sb) && !readonly) { if (!readonly && (ext4_has_feature_quota(sb) ||
ext4_has_feature_project(sb))) {
ext4_msg(sb, KERN_ERR, ext4_msg(sb, KERN_ERR,
"Filesystem with quota feature cannot be mounted RDWR " "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");
"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");
return 0; return 0;
} }
#endif /* CONFIG_QUOTA */ #endif /* CONFIG_QUOTA */