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path: root/fs/overlayfs/super.c
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Diffstat (limited to 'fs/overlayfs/super.c')
-rw-r--r--fs/overlayfs/super.c95
1 files changed, 82 insertions, 13 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 290983bcfbb3..2bd570cbe8a4 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -79,7 +79,7 @@ static void ovl_dentry_release(struct dentry *dentry)
static struct dentry *ovl_d_real(struct dentry *dentry,
const struct inode *inode)
{
- struct dentry *real;
+ struct dentry *real = NULL, *lower;
/* It's an overlay file */
if (inode && d_inode(dentry) == inode)
@@ -98,9 +98,10 @@ static struct dentry *ovl_d_real(struct dentry *dentry,
if (real && !inode && ovl_has_upperdata(d_inode(dentry)))
return real;
- real = ovl_dentry_lowerdata(dentry);
- if (!real)
+ lower = ovl_dentry_lowerdata(dentry);
+ if (!lower)
goto bug;
+ real = lower;
/* Handle recursion */
real = d_real(real, inode);
@@ -108,8 +109,10 @@ static struct dentry *ovl_d_real(struct dentry *dentry,
if (!inode || inode == d_inode(real))
return real;
bug:
- WARN(1, "ovl_d_real(%pd4, %s:%lu): real dentry not found\n", dentry,
- inode ? inode->i_sb->s_id : "NULL", inode ? inode->i_ino : 0);
+ WARN(1, "%s(%pd4, %s:%lu): real dentry (%p/%lu) not found\n",
+ __func__, dentry, inode ? inode->i_sb->s_id : "NULL",
+ inode ? inode->i_ino : 0, real,
+ real && d_inode(real) ? d_inode(real)->i_ino : 0);
return dentry;
}
@@ -356,6 +359,8 @@ static int ovl_show_options(struct seq_file *m, struct dentry *dentry)
seq_printf(m, ",redirect_dir=%s", ofs->config.redirect_mode);
if (ofs->config.index != ovl_index_def)
seq_printf(m, ",index=%s", ofs->config.index ? "on" : "off");
+ if (!ofs->config.uuid)
+ seq_puts(m, ",uuid=off");
if (ofs->config.nfs_export != ovl_nfs_export_def)
seq_printf(m, ",nfs_export=%s", ofs->config.nfs_export ?
"on" : "off");
@@ -410,7 +415,10 @@ enum {
OPT_REDIRECT_DIR,
OPT_INDEX_ON,
OPT_INDEX_OFF,
+ OPT_UUID_ON,
+ OPT_UUID_OFF,
OPT_NFS_EXPORT_ON,
+ OPT_USERXATTR,
OPT_NFS_EXPORT_OFF,
OPT_XINO_ON,
OPT_XINO_OFF,
@@ -429,6 +437,9 @@ static const match_table_t ovl_tokens = {
{OPT_REDIRECT_DIR, "redirect_dir=%s"},
{OPT_INDEX_ON, "index=on"},
{OPT_INDEX_OFF, "index=off"},
+ {OPT_USERXATTR, "userxattr"},
+ {OPT_UUID_ON, "uuid=on"},
+ {OPT_UUID_OFF, "uuid=off"},
{OPT_NFS_EXPORT_ON, "nfs_export=on"},
{OPT_NFS_EXPORT_OFF, "nfs_export=off"},
{OPT_XINO_ON, "xino=on"},
@@ -549,6 +560,14 @@ static int ovl_parse_opt(char *opt, struct ovl_config *config)
index_opt = true;
break;
+ case OPT_UUID_ON:
+ config->uuid = true;
+ break;
+
+ case OPT_UUID_OFF:
+ config->uuid = false;
+ break;
+
case OPT_NFS_EXPORT_ON:
config->nfs_export = true;
nfs_export_opt = true;
@@ -585,6 +604,10 @@ static int ovl_parse_opt(char *opt, struct ovl_config *config)
config->ovl_volatile = true;
break;
+ case OPT_USERXATTR:
+ config->userxattr = true;
+ break;
+
default:
pr_err("unrecognized mount option \"%s\" or missing value\n",
p);
@@ -688,6 +711,28 @@ static int ovl_parse_opt(char *opt, struct ovl_config *config)
}
}
+
+ /* Resolve userxattr -> !redirect && !metacopy dependency */
+ if (config->userxattr) {
+ if (config->redirect_follow && redirect_opt) {
+ pr_err("conflicting options: userxattr,redirect_dir=%s\n",
+ config->redirect_mode);
+ return -EINVAL;
+ }
+ if (config->metacopy && metacopy_opt) {
+ pr_err("conflicting options: userxattr,metacopy=on\n");
+ return -EINVAL;
+ }
+ /*
+ * Silently disable default setting of redirect and metacopy.
+ * This shall be the default in the future as well: these
+ * options must be explicitly enabled if used together with
+ * userxattr.
+ */
+ config->redirect_dir = config->redirect_follow = false;
+ config->metacopy = false;
+ }
+
return 0;
}
@@ -1037,8 +1082,14 @@ ovl_posix_acl_default_xattr_handler = {
.set = ovl_posix_acl_xattr_set,
};
-static const struct xattr_handler ovl_own_xattr_handler = {
- .prefix = OVL_XATTR_PREFIX,
+static const struct xattr_handler ovl_own_trusted_xattr_handler = {
+ .prefix = OVL_XATTR_TRUSTED_PREFIX,
+ .get = ovl_own_xattr_get,
+ .set = ovl_own_xattr_set,
+};
+
+static const struct xattr_handler ovl_own_user_xattr_handler = {
+ .prefix = OVL_XATTR_USER_PREFIX,
.get = ovl_own_xattr_get,
.set = ovl_own_xattr_set,
};
@@ -1049,12 +1100,22 @@ static const struct xattr_handler ovl_other_xattr_handler = {
.set = ovl_other_xattr_set,
};
-static const struct xattr_handler *ovl_xattr_handlers[] = {
+static const struct xattr_handler *ovl_trusted_xattr_handlers[] = {
#ifdef CONFIG_FS_POSIX_ACL
&ovl_posix_acl_access_xattr_handler,
&ovl_posix_acl_default_xattr_handler,
#endif
- &ovl_own_xattr_handler,
+ &ovl_own_trusted_xattr_handler,
+ &ovl_other_xattr_handler,
+ NULL
+};
+
+static const struct xattr_handler *ovl_user_xattr_handlers[] = {
+#ifdef CONFIG_FS_POSIX_ACL
+ &ovl_posix_acl_access_xattr_handler,
+ &ovl_posix_acl_default_xattr_handler,
+#endif
+ &ovl_own_user_xattr_handler,
&ovl_other_xattr_handler,
NULL
};
@@ -1317,7 +1378,7 @@ static int ovl_make_workdir(struct super_block *sb, struct ovl_fs *ofs,
pr_warn("upper fs does not support RENAME_WHITEOUT.\n");
/*
- * Check if upper/work fs supports trusted.overlay.* xattr
+ * Check if upper/work fs supports (trusted|user).overlay.* xattr
*/
err = ovl_do_setxattr(ofs, ofs->workdir, OVL_XATTR_OPAQUE, "0", 1);
if (err) {
@@ -1456,10 +1517,10 @@ static int ovl_get_indexdir(struct super_block *sb, struct ovl_fs *ofs,
/*
* Verify upper root is exclusively associated with index dir.
- * Older kernels stored upper fh in "trusted.overlay.origin"
+ * Older kernels stored upper fh in ".overlay.origin"
* xattr. If that xattr exists, verify that it is a match to
* upper dir file handle. In any case, verify or set xattr
- * "trusted.overlay.upper" to indicate that index may have
+ * ".overlay.upper" to indicate that index may have
* directory entries.
*/
if (ovl_check_origin_xattr(ofs, ofs->indexdir)) {
@@ -1877,6 +1938,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
ofs->share_whiteout = true;
ofs->config.index = ovl_index_def;
+ ofs->config.uuid = true;
ofs->config.nfs_export = ovl_nfs_export_def;
ofs->config.xino = ovl_xino_def();
ofs->config.metacopy = ovl_metacopy_def;
@@ -1956,6 +2018,11 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
if (!ovl_upper_mnt(ofs))
sb->s_flags |= SB_RDONLY;
+ if (!ofs->config.uuid && ofs->numfs > 1) {
+ pr_warn("The uuid=off requires a single fs for lower and upper, falling back to uuid=on.\n");
+ ofs->config.uuid = true;
+ }
+
if (!ovl_force_readonly(ofs) && ofs->config.index) {
err = ovl_get_indexdir(sb, ofs, oe, &upperpath);
if (err)
@@ -1991,7 +2058,8 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
cap_lower(cred->cap_effective, CAP_SYS_RESOURCE);
sb->s_magic = OVERLAYFS_SUPER_MAGIC;
- sb->s_xattr = ovl_xattr_handlers;
+ sb->s_xattr = ofs->config.userxattr ? ovl_user_xattr_handlers :
+ ovl_trusted_xattr_handlers;
sb->s_fs_info = ofs;
sb->s_flags |= SB_POSIXACL;
sb->s_iflags |= SB_I_SKIP_SYNC;
@@ -2028,6 +2096,7 @@ static struct dentry *ovl_mount(struct file_system_type *fs_type, int flags,
static struct file_system_type ovl_fs_type = {
.owner = THIS_MODULE,
.name = "overlay",
+ .fs_flags = FS_USERNS_MOUNT,
.mount = ovl_mount,
.kill_sb = kill_anon_super,
};
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-11 23:34:38 +0300