diff options
Diffstat (limited to 'fs/ceph/acl.c')
| -rw-r--r-- | fs/ceph/acl.c | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/fs/ceph/acl.c b/fs/ceph/acl.c new file mode 100644 index 000000000..f4fc8e0b8 --- /dev/null +++ b/fs/ceph/acl.c @@ -0,0 +1,262 @@ +// 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 user_namespace *mnt_userns, struct inode *inode, + struct posix_acl *acl, int type) +{ + int ret = 0, size = 0; + const char *name = NULL; + char *value = NULL; + struct iattr newattrs; + struct timespec64 old_ctime = inode->i_ctime; + 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(&init_user_ns, 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); + 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); + } + 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); +} |