413 lines
9.5 KiB
C
413 lines
9.5 KiB
C
/*
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* fs/f2fs/acl.c
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* Portions of this code from linux/fs/ext2/acl.c
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*
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* Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/f2fs_fs.h>
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#include "f2fs.h"
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#include "xattr.h"
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#include "acl.h"
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#define get_inode_mode(i) ((is_inode_flag_set(F2FS_I(i), FI_ACL_MODE)) ? \
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(F2FS_I(i)->i_acl_mode) : ((i)->i_mode))
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static inline size_t f2fs_acl_size(int count)
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{
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if (count <= 4) {
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return sizeof(struct f2fs_acl_header) +
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count * sizeof(struct f2fs_acl_entry_short);
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} else {
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return sizeof(struct f2fs_acl_header) +
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4 * sizeof(struct f2fs_acl_entry_short) +
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(count - 4) * sizeof(struct f2fs_acl_entry);
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}
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}
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static inline int f2fs_acl_count(size_t size)
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{
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ssize_t s;
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size -= sizeof(struct f2fs_acl_header);
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s = size - 4 * sizeof(struct f2fs_acl_entry_short);
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if (s < 0) {
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if (size % sizeof(struct f2fs_acl_entry_short))
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return -1;
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return size / sizeof(struct f2fs_acl_entry_short);
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} else {
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if (s % sizeof(struct f2fs_acl_entry))
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return -1;
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return s / sizeof(struct f2fs_acl_entry) + 4;
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}
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}
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static struct posix_acl *f2fs_acl_from_disk(const char *value, size_t size)
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{
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int i, count;
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struct posix_acl *acl;
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struct f2fs_acl_header *hdr = (struct f2fs_acl_header *)value;
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struct f2fs_acl_entry *entry = (struct f2fs_acl_entry *)(hdr + 1);
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const char *end = value + size;
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if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION))
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return ERR_PTR(-EINVAL);
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count = f2fs_acl_count(size);
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if (count < 0)
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return ERR_PTR(-EINVAL);
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if (count == 0)
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return NULL;
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acl = posix_acl_alloc(count, GFP_KERNEL);
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if (!acl)
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return ERR_PTR(-ENOMEM);
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for (i = 0; i < count; i++) {
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if ((char *)entry > end)
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goto fail;
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acl->a_entries[i].e_tag = le16_to_cpu(entry->e_tag);
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acl->a_entries[i].e_perm = le16_to_cpu(entry->e_perm);
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switch (acl->a_entries[i].e_tag) {
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case ACL_USER_OBJ:
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case ACL_GROUP_OBJ:
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case ACL_MASK:
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case ACL_OTHER:
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entry = (struct f2fs_acl_entry *)((char *)entry +
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sizeof(struct f2fs_acl_entry_short));
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break;
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case ACL_USER:
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acl->a_entries[i].e_uid =
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make_kuid(&init_user_ns,
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le32_to_cpu(entry->e_id));
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entry = (struct f2fs_acl_entry *)((char *)entry +
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sizeof(struct f2fs_acl_entry));
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break;
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case ACL_GROUP:
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acl->a_entries[i].e_gid =
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make_kgid(&init_user_ns,
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le32_to_cpu(entry->e_id));
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entry = (struct f2fs_acl_entry *)((char *)entry +
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sizeof(struct f2fs_acl_entry));
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break;
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default:
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goto fail;
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}
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}
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if ((char *)entry != end)
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goto fail;
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return acl;
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fail:
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posix_acl_release(acl);
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return ERR_PTR(-EINVAL);
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}
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static void *f2fs_acl_to_disk(const struct posix_acl *acl, size_t *size)
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{
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struct f2fs_acl_header *f2fs_acl;
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struct f2fs_acl_entry *entry;
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int i;
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f2fs_acl = kmalloc(sizeof(struct f2fs_acl_header) + acl->a_count *
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sizeof(struct f2fs_acl_entry), GFP_KERNEL);
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if (!f2fs_acl)
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return ERR_PTR(-ENOMEM);
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f2fs_acl->a_version = cpu_to_le32(F2FS_ACL_VERSION);
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entry = (struct f2fs_acl_entry *)(f2fs_acl + 1);
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for (i = 0; i < acl->a_count; i++) {
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entry->e_tag = cpu_to_le16(acl->a_entries[i].e_tag);
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entry->e_perm = cpu_to_le16(acl->a_entries[i].e_perm);
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switch (acl->a_entries[i].e_tag) {
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case ACL_USER:
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entry->e_id = cpu_to_le32(
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from_kuid(&init_user_ns,
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acl->a_entries[i].e_uid));
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entry = (struct f2fs_acl_entry *)((char *)entry +
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sizeof(struct f2fs_acl_entry));
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break;
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case ACL_GROUP:
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entry->e_id = cpu_to_le32(
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from_kgid(&init_user_ns,
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acl->a_entries[i].e_gid));
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entry = (struct f2fs_acl_entry *)((char *)entry +
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sizeof(struct f2fs_acl_entry));
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break;
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case ACL_USER_OBJ:
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case ACL_GROUP_OBJ:
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case ACL_MASK:
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case ACL_OTHER:
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entry = (struct f2fs_acl_entry *)((char *)entry +
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sizeof(struct f2fs_acl_entry_short));
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break;
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default:
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goto fail;
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}
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}
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*size = f2fs_acl_size(acl->a_count);
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return (void *)f2fs_acl;
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fail:
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kfree(f2fs_acl);
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return ERR_PTR(-EINVAL);
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}
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struct posix_acl *f2fs_get_acl(struct inode *inode, int type)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
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int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
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void *value = NULL;
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struct posix_acl *acl;
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int retval;
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if (!test_opt(sbi, POSIX_ACL))
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return NULL;
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acl = get_cached_acl(inode, type);
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if (acl != ACL_NOT_CACHED)
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return acl;
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if (type == ACL_TYPE_ACCESS)
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name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
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retval = f2fs_getxattr(inode, name_index, "", NULL, 0);
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if (retval > 0) {
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value = kmalloc(retval, GFP_KERNEL);
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if (!value)
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return ERR_PTR(-ENOMEM);
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retval = f2fs_getxattr(inode, name_index, "", value, retval);
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}
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if (retval > 0)
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acl = f2fs_acl_from_disk(value, retval);
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else if (retval == -ENODATA)
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acl = NULL;
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else
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acl = ERR_PTR(retval);
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kfree(value);
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if (!IS_ERR(acl))
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set_cached_acl(inode, type, acl);
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return acl;
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}
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static int f2fs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
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struct f2fs_inode_info *fi = F2FS_I(inode);
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int name_index;
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void *value = NULL;
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size_t size = 0;
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int error;
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if (!test_opt(sbi, POSIX_ACL))
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return 0;
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if (S_ISLNK(inode->i_mode))
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return -EOPNOTSUPP;
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switch (type) {
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case ACL_TYPE_ACCESS:
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name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
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if (acl) {
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error = posix_acl_equiv_mode(acl, &inode->i_mode);
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if (error < 0)
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return error;
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set_acl_inode(fi, inode->i_mode);
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if (error == 0)
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acl = NULL;
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}
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break;
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case ACL_TYPE_DEFAULT:
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name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
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if (!S_ISDIR(inode->i_mode))
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return acl ? -EACCES : 0;
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break;
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default:
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return -EINVAL;
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}
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if (acl) {
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value = f2fs_acl_to_disk(acl, &size);
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if (IS_ERR(value)) {
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cond_clear_inode_flag(fi, FI_ACL_MODE);
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return (int)PTR_ERR(value);
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}
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}
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error = f2fs_setxattr(inode, name_index, "", value, size);
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kfree(value);
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if (!error)
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set_cached_acl(inode, type, acl);
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cond_clear_inode_flag(fi, FI_ACL_MODE);
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return error;
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}
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int f2fs_init_acl(struct inode *inode, struct inode *dir)
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{
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struct posix_acl *acl = NULL;
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struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
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int error = 0;
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if (!S_ISLNK(inode->i_mode)) {
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if (test_opt(sbi, POSIX_ACL)) {
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acl = f2fs_get_acl(dir, ACL_TYPE_DEFAULT);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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}
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if (!acl)
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inode->i_mode &= ~current_umask();
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}
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if (test_opt(sbi, POSIX_ACL) && acl) {
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if (S_ISDIR(inode->i_mode)) {
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error = f2fs_set_acl(inode, ACL_TYPE_DEFAULT, acl);
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if (error)
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goto cleanup;
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}
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error = posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
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if (error < 0)
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return error;
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if (error > 0)
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error = f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl);
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}
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cleanup:
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posix_acl_release(acl);
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return error;
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}
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int f2fs_acl_chmod(struct inode *inode)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
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struct posix_acl *acl;
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int error;
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mode_t mode = get_inode_mode(inode);
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if (!test_opt(sbi, POSIX_ACL))
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return 0;
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if (S_ISLNK(mode))
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return -EOPNOTSUPP;
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acl = f2fs_get_acl(inode, ACL_TYPE_ACCESS);
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if (IS_ERR(acl) || !acl)
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return PTR_ERR(acl);
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error = posix_acl_chmod(&acl, GFP_KERNEL, mode);
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if (error)
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return error;
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error = f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl);
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posix_acl_release(acl);
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return error;
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}
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static size_t f2fs_xattr_list_acl(struct dentry *dentry, char *list,
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size_t list_size, const char *name, size_t name_len, int type)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
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const char *xname = POSIX_ACL_XATTR_DEFAULT;
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size_t size;
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if (!test_opt(sbi, POSIX_ACL))
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return 0;
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if (type == ACL_TYPE_ACCESS)
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xname = POSIX_ACL_XATTR_ACCESS;
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size = strlen(xname) + 1;
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if (list && size <= list_size)
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memcpy(list, xname, size);
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return size;
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}
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static int f2fs_xattr_get_acl(struct dentry *dentry, const char *name,
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void *buffer, size_t size, int type)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
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struct posix_acl *acl;
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int error;
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if (strcmp(name, "") != 0)
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return -EINVAL;
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if (!test_opt(sbi, POSIX_ACL))
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return -EOPNOTSUPP;
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acl = f2fs_get_acl(dentry->d_inode, type);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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if (!acl)
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return -ENODATA;
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error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
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posix_acl_release(acl);
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return error;
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}
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static int f2fs_xattr_set_acl(struct dentry *dentry, const char *name,
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const void *value, size_t size, int flags, int type)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
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struct inode *inode = dentry->d_inode;
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struct posix_acl *acl = NULL;
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int error;
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if (strcmp(name, "") != 0)
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return -EINVAL;
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if (!test_opt(sbi, POSIX_ACL))
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return -EOPNOTSUPP;
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if (!inode_owner_or_capable(inode))
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return -EPERM;
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if (value) {
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acl = posix_acl_from_xattr(&init_user_ns, value, size);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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if (acl) {
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error = posix_acl_valid(acl);
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if (error)
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goto release_and_out;
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}
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} else {
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acl = NULL;
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}
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error = f2fs_set_acl(inode, type, acl);
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release_and_out:
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posix_acl_release(acl);
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return error;
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}
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const struct xattr_handler f2fs_xattr_acl_default_handler = {
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.prefix = POSIX_ACL_XATTR_DEFAULT,
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.flags = ACL_TYPE_DEFAULT,
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.list = f2fs_xattr_list_acl,
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.get = f2fs_xattr_get_acl,
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.set = f2fs_xattr_set_acl,
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};
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const struct xattr_handler f2fs_xattr_acl_access_handler = {
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.prefix = POSIX_ACL_XATTR_ACCESS,
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.flags = ACL_TYPE_ACCESS,
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.list = f2fs_xattr_list_acl,
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.get = f2fs_xattr_get_acl,
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.set = f2fs_xattr_set_acl,
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};
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