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ovl: resolve more conflicting mount options

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Similar to the way that a conflict between metacopy=on,redirect_dir=off is
resolved, also resolve conflicts between nfs_export=on,index=off and
nfs_export=on,metacopy=on.

An explicit mount option wins over a default config value.  Both explicit
mount options result in an error.

Without this change the xfstests group overlay/exportfs are skipped if
metacopy is enabled by default.

Reported-by: Chengguang Xu <cgxu519@mykernel.net>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein
2020-04-09 18:58:34 +03:00
committed by Miklos Szeredi
parent 9aafc1b018
commit b0def88d80
2 changed files with 53 additions and 2 deletions
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48
fs/overlayfs/super.c
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@@ -470,6 +470,7 @@ static int ovl_parse_opt(char *opt, struct ovl_config *config)
char *p;
int err;
bool metacopy_opt = false, redirect_opt = false;
bool nfs_export_opt = false, index_opt = false;
config->redirect_mode = kstrdup(ovl_redirect_mode_def(), GFP_KERNEL);
if (!config->redirect_mode)
@@ -519,18 +520,22 @@ static int ovl_parse_opt(char *opt, struct ovl_config *config)
case OPT_INDEX_ON:
config->index = true;
index_opt = true;
break;
case OPT_INDEX_OFF:
config->index = false;
index_opt = true;
break;
case OPT_NFS_EXPORT_ON:
config->nfs_export = true;
nfs_export_opt = true;
break;
case OPT_NFS_EXPORT_OFF:
config->nfs_export = false;
nfs_export_opt = true;
break;
case OPT_XINO_ON:
@@ -552,6 +557,7 @@ static int ovl_parse_opt(char *opt, struct ovl_config *config)
case OPT_METACOPY_OFF:
config->metacopy = false;
metacopy_opt = true;
break;
default:
@@ -601,6 +607,48 @@ static int ovl_parse_opt(char *opt, struct ovl_config *config)
}
}
/* Resolve nfs_export -> index dependency */
if (config->nfs_export && !config->index) {
if (nfs_export_opt && index_opt) {
pr_err("conflicting options: nfs_export=on,index=off\n");
return -EINVAL;
}
if (index_opt) {
/*
* There was an explicit index=off that resulted
* in this conflict.
*/
pr_info("disabling nfs_export due to index=off\n");
config->nfs_export = false;
} else {
/* Automatically enable index otherwise. */
config->index = true;
}
}
/* Resolve nfs_export -> !metacopy dependency */
if (config->nfs_export && config->metacopy) {
if (nfs_export_opt && metacopy_opt) {
pr_err("conflicting options: nfs_export=on,metacopy=on\n");
return -EINVAL;
}
if (metacopy_opt) {
/*
* There was an explicit metacopy=on that resulted
* in this conflict.
*/
pr_info("disabling nfs_export due to metacopy=on\n");
config->nfs_export = false;
} else {
/*
* There was an explicit nfs_export=on that resulted
* in this conflict.
*/
pr_info("disabling metacopy due to nfs_export=on\n");
config->metacopy = false;
}
}
return 0;
}