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| author | Amir Goldstein <amir73il@gmail.com> | 2020-04-09 18:58:34 +0300 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2020-05-13 11:11:24 +0200 |
| commit | b0def88d807f6db6076aab2aeb11f542036e81a6 (patch) | |
| tree | 5b38242c01c2fe6af8c1a79d13dd5156d8c20dd5 /fs/overlayfs | |
| parent | 9aafc1b0187322fa4fd4eb905d0903172237206c (diff) | |
| download | lwn-b0def88d807f6db6076aab2aeb11f542036e81a6.tar.gz lwn-b0def88d807f6db6076aab2aeb11f542036e81a6.zip | |
ovl: resolve more conflicting mount options
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>
Diffstat (limited to 'fs/overlayfs')
| -rw-r--r-- | fs/overlayfs/super.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 732ad5495c92..fbd6207acdbf 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -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; } |