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-rw-r--r--fs/ceph/acl.c263
1 files changed, 263 insertions, 0 deletions
diff --git a/fs/ceph/acl.c b/fs/ceph/acl.c
new file mode 100644
index 0000000000..c53a1d2206
--- /dev/null
+++ b/fs/ceph/acl.c
@@ -0,0 +1,263 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/fs/ceph/acl.c
+ *
+ * Copyright (C) 2013 Guangliang Zhao, <lucienchao@gmail.com>
+ */
+
+#include <linux/ceph/ceph_debug.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/xattr.h>
+#include <linux/posix_acl_xattr.h>
+#include <linux/posix_acl.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+
+#include "super.h"
+
+static inline void ceph_set_cached_acl(struct inode *inode,
+ int type, struct posix_acl *acl)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+
+ spin_lock(&ci->i_ceph_lock);
+ if (__ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 0))
+ set_cached_acl(inode, type, acl);
+ else
+ forget_cached_acl(inode, type);
+ spin_unlock(&ci->i_ceph_lock);
+}
+
+struct posix_acl *ceph_get_acl(struct inode *inode, int type, bool rcu)
+{
+ int size;
+ unsigned int retry_cnt = 0;
+ const char *name;
+ char *value = NULL;
+ struct posix_acl *acl;
+
+ if (rcu)
+ return ERR_PTR(-ECHILD);
+
+ switch (type) {
+ case ACL_TYPE_ACCESS:
+ name = XATTR_NAME_POSIX_ACL_ACCESS;
+ break;
+ case ACL_TYPE_DEFAULT:
+ name = XATTR_NAME_POSIX_ACL_DEFAULT;
+ break;
+ default:
+ BUG();
+ }
+
+retry:
+ size = __ceph_getxattr(inode, name, "", 0);
+ if (size > 0) {
+ value = kzalloc(size, GFP_NOFS);
+ if (!value)
+ return ERR_PTR(-ENOMEM);
+ size = __ceph_getxattr(inode, name, value, size);
+ }
+
+ if (size == -ERANGE && retry_cnt < 10) {
+ retry_cnt++;
+ kfree(value);
+ value = NULL;
+ goto retry;
+ }
+
+ if (size > 0) {
+ acl = posix_acl_from_xattr(&init_user_ns, value, size);
+ } else if (size == -ENODATA || size == 0) {
+ acl = NULL;
+ } else {
+ pr_err_ratelimited("get acl %llx.%llx failed, err=%d\n",
+ ceph_vinop(inode), size);
+ acl = ERR_PTR(-EIO);
+ }
+
+ kfree(value);
+
+ if (!IS_ERR(acl))
+ ceph_set_cached_acl(inode, type, acl);
+
+ return acl;
+}
+
+int ceph_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
+ struct posix_acl *acl, int type)
+{
+ int ret = 0, size = 0;
+ const char *name = NULL;
+ char *value = NULL;
+ struct iattr newattrs;
+ struct inode *inode = d_inode(dentry);
+ struct timespec64 old_ctime = inode_get_ctime(inode);
+ umode_t new_mode = inode->i_mode, old_mode = inode->i_mode;
+
+ if (ceph_snap(inode) != CEPH_NOSNAP) {
+ ret = -EROFS;
+ goto out;
+ }
+
+ switch (type) {
+ case ACL_TYPE_ACCESS:
+ name = XATTR_NAME_POSIX_ACL_ACCESS;
+ if (acl) {
+ ret = posix_acl_update_mode(&nop_mnt_idmap, inode,
+ &new_mode, &acl);
+ if (ret)
+ goto out;
+ }
+ break;
+ case ACL_TYPE_DEFAULT:
+ if (!S_ISDIR(inode->i_mode)) {
+ ret = acl ? -EINVAL : 0;
+ goto out;
+ }
+ name = XATTR_NAME_POSIX_ACL_DEFAULT;
+ break;
+ default:
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (acl) {
+ size = posix_acl_xattr_size(acl->a_count);
+ value = kmalloc(size, GFP_NOFS);
+ if (!value) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
+ if (ret < 0)
+ goto out_free;
+ }
+
+ if (new_mode != old_mode) {
+ newattrs.ia_ctime = current_time(inode);
+ newattrs.ia_mode = new_mode;
+ newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
+ ret = __ceph_setattr(inode, &newattrs, NULL);
+ if (ret)
+ goto out_free;
+ }
+
+ ret = __ceph_setxattr(inode, name, value, size, 0);
+ if (ret) {
+ if (new_mode != old_mode) {
+ newattrs.ia_ctime = old_ctime;
+ newattrs.ia_mode = old_mode;
+ newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
+ __ceph_setattr(inode, &newattrs, NULL);
+ }
+ goto out_free;
+ }
+
+ ceph_set_cached_acl(inode, type, acl);
+
+out_free:
+ kfree(value);
+out:
+ return ret;
+}
+
+int ceph_pre_init_acls(struct inode *dir, umode_t *mode,
+ struct ceph_acl_sec_ctx *as_ctx)
+{
+ struct posix_acl *acl, *default_acl;
+ size_t val_size1 = 0, val_size2 = 0;
+ struct ceph_pagelist *pagelist = NULL;
+ void *tmp_buf = NULL;
+ int err;
+
+ err = posix_acl_create(dir, mode, &default_acl, &acl);
+ if (err)
+ return err;
+
+ if (acl) {
+ err = posix_acl_equiv_mode(acl, mode);
+ if (err < 0)
+ goto out_err;
+ if (err == 0) {
+ posix_acl_release(acl);
+ acl = NULL;
+ }
+ }
+
+ if (!default_acl && !acl)
+ return 0;
+
+ if (acl)
+ val_size1 = posix_acl_xattr_size(acl->a_count);
+ if (default_acl)
+ val_size2 = posix_acl_xattr_size(default_acl->a_count);
+
+ err = -ENOMEM;
+ tmp_buf = kmalloc(max(val_size1, val_size2), GFP_KERNEL);
+ if (!tmp_buf)
+ goto out_err;
+ pagelist = ceph_pagelist_alloc(GFP_KERNEL);
+ if (!pagelist)
+ goto out_err;
+
+ err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
+ if (err)
+ goto out_err;
+
+ ceph_pagelist_encode_32(pagelist, acl && default_acl ? 2 : 1);
+
+ if (acl) {
+ size_t len = strlen(XATTR_NAME_POSIX_ACL_ACCESS);
+ err = ceph_pagelist_reserve(pagelist, len + val_size1 + 8);
+ if (err)
+ goto out_err;
+ ceph_pagelist_encode_string(pagelist, XATTR_NAME_POSIX_ACL_ACCESS,
+ len);
+ err = posix_acl_to_xattr(&init_user_ns, acl,
+ tmp_buf, val_size1);
+ if (err < 0)
+ goto out_err;
+ ceph_pagelist_encode_32(pagelist, val_size1);
+ ceph_pagelist_append(pagelist, tmp_buf, val_size1);
+ }
+ if (default_acl) {
+ size_t len = strlen(XATTR_NAME_POSIX_ACL_DEFAULT);
+ err = ceph_pagelist_reserve(pagelist, len + val_size2 + 8);
+ if (err)
+ goto out_err;
+ ceph_pagelist_encode_string(pagelist,
+ XATTR_NAME_POSIX_ACL_DEFAULT, len);
+ err = posix_acl_to_xattr(&init_user_ns, default_acl,
+ tmp_buf, val_size2);
+ if (err < 0)
+ goto out_err;
+ ceph_pagelist_encode_32(pagelist, val_size2);
+ ceph_pagelist_append(pagelist, tmp_buf, val_size2);
+ }
+
+ kfree(tmp_buf);
+
+ as_ctx->acl = acl;
+ as_ctx->default_acl = default_acl;
+ as_ctx->pagelist = pagelist;
+ return 0;
+
+out_err:
+ posix_acl_release(acl);
+ posix_acl_release(default_acl);
+ kfree(tmp_buf);
+ if (pagelist)
+ ceph_pagelist_release(pagelist);
+ return err;
+}
+
+void ceph_init_inode_acls(struct inode *inode, struct ceph_acl_sec_ctx *as_ctx)
+{
+ if (!inode)
+ return;
+ ceph_set_cached_acl(inode, ACL_TYPE_ACCESS, as_ctx->acl);
+ ceph_set_cached_acl(inode, ACL_TYPE_DEFAULT, as_ctx->default_acl);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-16 12:30:27 +0000