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571 lines
15 KiB
571 lines
15 KiB
#include <linux/fs.h>
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#include <linux/posix_acl.h>
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#include <linux/reiserfs_fs.h>
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#include <linux/errno.h>
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#include <linux/pagemap.h>
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#include <linux/xattr.h>
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#include <linux/xattr_acl.h>
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#include <linux/reiserfs_xattr.h>
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#include <linux/reiserfs_acl.h>
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#include <asm/uaccess.h>
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static int reiserfs_set_acl(struct inode *inode, int type, struct posix_acl *acl);
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static int
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xattr_set_acl(struct inode *inode, int type, const void *value, size_t size)
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{
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struct posix_acl *acl;
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int error;
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if (!reiserfs_posixacl(inode->i_sb))
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return -EOPNOTSUPP;
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if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
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return -EPERM;
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if (value) {
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acl = posix_acl_from_xattr(value, size);
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if (IS_ERR(acl)) {
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return PTR_ERR(acl);
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} else 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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error = reiserfs_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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static int
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xattr_get_acl(struct inode *inode, int type, void *buffer, size_t size)
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{
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struct posix_acl *acl;
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int error;
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if (!reiserfs_posixacl(inode->i_sb))
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return -EOPNOTSUPP;
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acl = reiserfs_get_acl (inode, type);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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if (acl == NULL)
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return -ENODATA;
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error = posix_acl_to_xattr(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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/*
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* Convert from filesystem to in-memory representation.
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*/
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static struct posix_acl *
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posix_acl_from_disk(const void *value, size_t size)
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{
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const char *end = (char *)value + size;
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int n, count;
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struct posix_acl *acl;
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if (!value)
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return NULL;
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if (size < sizeof(reiserfs_acl_header))
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return ERR_PTR(-EINVAL);
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if (((reiserfs_acl_header *)value)->a_version !=
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cpu_to_le32(REISERFS_ACL_VERSION))
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return ERR_PTR(-EINVAL);
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value = (char *)value + sizeof(reiserfs_acl_header);
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count = reiserfs_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_NOFS);
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if (!acl)
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return ERR_PTR(-ENOMEM);
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for (n=0; n < count; n++) {
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reiserfs_acl_entry *entry =
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(reiserfs_acl_entry *)value;
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if ((char *)value + sizeof(reiserfs_acl_entry_short) > end)
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goto fail;
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acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
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acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
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switch(acl->a_entries[n].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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value = (char *)value +
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sizeof(reiserfs_acl_entry_short);
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acl->a_entries[n].e_id = ACL_UNDEFINED_ID;
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break;
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case ACL_USER:
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case ACL_GROUP:
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value = (char *)value + sizeof(reiserfs_acl_entry);
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if ((char *)value > end)
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goto fail;
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acl->a_entries[n].e_id =
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le32_to_cpu(entry->e_id);
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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 (value != 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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/*
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* Convert from in-memory to filesystem representation.
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*/
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static void *
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posix_acl_to_disk(const struct posix_acl *acl, size_t *size)
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{
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reiserfs_acl_header *ext_acl;
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char *e;
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int n;
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*size = reiserfs_acl_size(acl->a_count);
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ext_acl = (reiserfs_acl_header *)kmalloc(sizeof(reiserfs_acl_header) +
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acl->a_count * sizeof(reiserfs_acl_entry), GFP_NOFS);
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if (!ext_acl)
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return ERR_PTR(-ENOMEM);
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ext_acl->a_version = cpu_to_le32(REISERFS_ACL_VERSION);
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e = (char *)ext_acl + sizeof(reiserfs_acl_header);
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for (n=0; n < acl->a_count; n++) {
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reiserfs_acl_entry *entry = (reiserfs_acl_entry *)e;
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entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
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entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
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switch(acl->a_entries[n].e_tag) {
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case ACL_USER:
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case ACL_GROUP:
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entry->e_id =
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cpu_to_le32(acl->a_entries[n].e_id);
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e += sizeof(reiserfs_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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e += sizeof(reiserfs_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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return (char *)ext_acl;
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fail:
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kfree(ext_acl);
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return ERR_PTR(-EINVAL);
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}
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/*
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* Inode operation get_posix_acl().
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*
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* inode->i_sem: down
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* BKL held [before 2.5.x]
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*/
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struct posix_acl *
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reiserfs_get_acl(struct inode *inode, int type)
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{
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char *name, *value;
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struct posix_acl *acl, **p_acl;
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size_t size;
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int retval;
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struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
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switch (type) {
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case ACL_TYPE_ACCESS:
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name = XATTR_NAME_ACL_ACCESS;
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p_acl = &reiserfs_i->i_acl_access;
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break;
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case ACL_TYPE_DEFAULT:
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name = XATTR_NAME_ACL_DEFAULT;
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p_acl = &reiserfs_i->i_acl_default;
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break;
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default:
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return ERR_PTR (-EINVAL);
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}
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if (IS_ERR (*p_acl)) {
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if (PTR_ERR (*p_acl) == -ENODATA)
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return NULL;
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} else if (*p_acl != NULL)
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return posix_acl_dup (*p_acl);
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size = reiserfs_xattr_get (inode, name, NULL, 0);
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if ((int)size < 0) {
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if (size == -ENODATA || size == -ENOSYS) {
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*p_acl = ERR_PTR (-ENODATA);
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return NULL;
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}
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return ERR_PTR (size);
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}
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value = kmalloc (size, GFP_NOFS);
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if (!value)
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return ERR_PTR (-ENOMEM);
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retval = reiserfs_xattr_get(inode, name, value, size);
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if (retval == -ENODATA || retval == -ENOSYS) {
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/* This shouldn't actually happen as it should have
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been caught above.. but just in case */
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acl = NULL;
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*p_acl = ERR_PTR (-ENODATA);
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} else if (retval < 0) {
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acl = ERR_PTR(retval);
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} else {
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acl = posix_acl_from_disk(value, retval);
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*p_acl = posix_acl_dup (acl);
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}
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kfree(value);
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return acl;
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}
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/*
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* Inode operation set_posix_acl().
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*
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* inode->i_sem: down
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* BKL held [before 2.5.x]
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*/
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static int
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reiserfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
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{
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char *name;
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void *value = NULL;
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struct posix_acl **p_acl;
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size_t size;
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int error;
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struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
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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 = XATTR_NAME_ACL_ACCESS;
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p_acl = &reiserfs_i->i_acl_access;
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if (acl) {
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mode_t mode = inode->i_mode;
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error = posix_acl_equiv_mode (acl, &mode);
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if (error < 0)
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return error;
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else {
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inode->i_mode = mode;
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if (error == 0)
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acl = NULL;
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}
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}
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break;
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case ACL_TYPE_DEFAULT:
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name = XATTR_NAME_ACL_DEFAULT;
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p_acl = &reiserfs_i->i_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 = posix_acl_to_disk(acl, &size);
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if (IS_ERR(value))
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return (int)PTR_ERR(value);
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error = reiserfs_xattr_set(inode, name, value, size, 0);
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} else {
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error = reiserfs_xattr_del (inode, name);
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if (error == -ENODATA) {
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/* This may seem odd here, but it means that the ACL was set
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* with a value representable with mode bits. If there was
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* an ACL before, reiserfs_xattr_del already dirtied the inode.
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*/
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mark_inode_dirty (inode);
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error = 0;
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}
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}
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if (value)
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kfree(value);
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if (!error) {
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/* Release the old one */
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if (!IS_ERR (*p_acl) && *p_acl)
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posix_acl_release (*p_acl);
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if (acl == NULL)
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*p_acl = ERR_PTR (-ENODATA);
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else
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*p_acl = posix_acl_dup (acl);
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}
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return error;
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}
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/* dir->i_sem: down,
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* inode is new and not released into the wild yet */
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int
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reiserfs_inherit_default_acl (struct inode *dir, struct dentry *dentry, struct inode *inode)
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{
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struct posix_acl *acl;
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int err = 0;
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/* ACLs only get applied to files and directories */
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if (S_ISLNK (inode->i_mode))
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return 0;
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/* ACLs can only be used on "new" objects, so if it's an old object
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* there is nothing to inherit from */
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if (get_inode_sd_version (dir) == STAT_DATA_V1)
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goto apply_umask;
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/* Don't apply ACLs to objects in the .reiserfs_priv tree.. This
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* would be useless since permissions are ignored, and a pain because
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* it introduces locking cycles */
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if (is_reiserfs_priv_object (dir)) {
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reiserfs_mark_inode_private (inode);
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goto apply_umask;
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}
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acl = reiserfs_get_acl (dir, ACL_TYPE_DEFAULT);
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if (IS_ERR (acl)) {
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if (PTR_ERR (acl) == -ENODATA)
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goto apply_umask;
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return PTR_ERR (acl);
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}
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if (acl) {
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struct posix_acl *acl_copy;
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mode_t mode = inode->i_mode;
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int need_acl;
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/* Copy the default ACL to the default ACL of a new directory */
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if (S_ISDIR (inode->i_mode)) {
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err = reiserfs_set_acl (inode, ACL_TYPE_DEFAULT, acl);
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if (err)
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goto cleanup;
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}
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/* Now we reconcile the new ACL and the mode,
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potentially modifying both */
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acl_copy = posix_acl_clone (acl, GFP_NOFS);
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if (!acl_copy) {
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err = -ENOMEM;
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goto cleanup;
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}
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need_acl = posix_acl_create_masq (acl_copy, &mode);
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if (need_acl >= 0) {
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if (mode != inode->i_mode) {
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inode->i_mode = mode;
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}
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/* If we need an ACL.. */
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if (need_acl > 0) {
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err = reiserfs_set_acl (inode, ACL_TYPE_ACCESS, acl_copy);
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if (err)
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goto cleanup_copy;
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}
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}
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cleanup_copy:
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posix_acl_release (acl_copy);
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cleanup:
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posix_acl_release (acl);
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} else {
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apply_umask:
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/* no ACL, apply umask */
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inode->i_mode &= ~current->fs->umask;
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}
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return err;
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}
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/* Looks up and caches the result of the default ACL.
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* We do this so that we don't need to carry the xattr_sem into
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* reiserfs_new_inode if we don't need to */
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int
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reiserfs_cache_default_acl (struct inode *inode)
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{
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int ret = 0;
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if (reiserfs_posixacl (inode->i_sb) &&
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!is_reiserfs_priv_object (inode)) {
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struct posix_acl *acl;
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reiserfs_read_lock_xattr_i (inode);
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reiserfs_read_lock_xattrs (inode->i_sb);
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acl = reiserfs_get_acl (inode, ACL_TYPE_DEFAULT);
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reiserfs_read_unlock_xattrs (inode->i_sb);
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reiserfs_read_unlock_xattr_i (inode);
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ret = acl ? 1 : 0;
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posix_acl_release (acl);
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}
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return ret;
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}
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int
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reiserfs_acl_chmod (struct inode *inode)
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{
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struct posix_acl *acl, *clone;
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int error;
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if (S_ISLNK(inode->i_mode))
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return -EOPNOTSUPP;
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if (get_inode_sd_version (inode) == STAT_DATA_V1 ||
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!reiserfs_posixacl(inode->i_sb))
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{
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return 0;
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}
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reiserfs_read_lock_xattrs (inode->i_sb);
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acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
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reiserfs_read_unlock_xattrs (inode->i_sb);
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if (!acl)
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return 0;
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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clone = posix_acl_clone(acl, GFP_NOFS);
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posix_acl_release(acl);
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if (!clone)
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return -ENOMEM;
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error = posix_acl_chmod_masq(clone, inode->i_mode);
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if (!error) {
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int lock = !has_xattr_dir (inode);
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reiserfs_write_lock_xattr_i (inode);
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if (lock)
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reiserfs_write_lock_xattrs (inode->i_sb);
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else
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reiserfs_read_lock_xattrs (inode->i_sb);
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error = reiserfs_set_acl(inode, ACL_TYPE_ACCESS, clone);
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if (lock)
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reiserfs_write_unlock_xattrs (inode->i_sb);
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else
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reiserfs_read_unlock_xattrs (inode->i_sb);
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reiserfs_write_unlock_xattr_i (inode);
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}
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posix_acl_release(clone);
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return error;
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}
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static int
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posix_acl_access_get(struct inode *inode, const char *name,
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void *buffer, size_t size)
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{
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if (strlen(name) != sizeof(XATTR_NAME_ACL_ACCESS)-1)
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return -EINVAL;
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return xattr_get_acl(inode, ACL_TYPE_ACCESS, buffer, size);
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}
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static int
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posix_acl_access_set(struct inode *inode, const char *name,
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const void *value, size_t size, int flags)
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{
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if (strlen(name) != sizeof(XATTR_NAME_ACL_ACCESS)-1)
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return -EINVAL;
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return xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size);
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}
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static int
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posix_acl_access_del (struct inode *inode, const char *name)
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{
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struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
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struct posix_acl **acl = &reiserfs_i->i_acl_access;
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if (strlen(name) != sizeof(XATTR_NAME_ACL_ACCESS)-1)
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return -EINVAL;
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if (!IS_ERR (*acl) && *acl) {
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posix_acl_release (*acl);
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*acl = ERR_PTR (-ENODATA);
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}
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return 0;
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}
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static int
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posix_acl_access_list (struct inode *inode, const char *name, int namelen, char *out)
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{
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int len = namelen;
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if (!reiserfs_posixacl (inode->i_sb))
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return 0;
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if (out)
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memcpy (out, name, len);
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return len;
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}
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struct reiserfs_xattr_handler posix_acl_access_handler = {
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.prefix = XATTR_NAME_ACL_ACCESS,
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.get = posix_acl_access_get,
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.set = posix_acl_access_set,
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.del = posix_acl_access_del,
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.list = posix_acl_access_list,
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};
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static int
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posix_acl_default_get (struct inode *inode, const char *name,
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void *buffer, size_t size)
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{
|
|
if (strlen(name) != sizeof(XATTR_NAME_ACL_DEFAULT)-1)
|
|
return -EINVAL;
|
|
return xattr_get_acl(inode, ACL_TYPE_DEFAULT, buffer, size);
|
|
}
|
|
|
|
static int
|
|
posix_acl_default_set(struct inode *inode, const char *name,
|
|
const void *value, size_t size, int flags)
|
|
{
|
|
if (strlen(name) != sizeof(XATTR_NAME_ACL_DEFAULT)-1)
|
|
return -EINVAL;
|
|
return xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size);
|
|
}
|
|
|
|
static int
|
|
posix_acl_default_del (struct inode *inode, const char *name)
|
|
{
|
|
struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
|
|
struct posix_acl **acl = &reiserfs_i->i_acl_default;
|
|
if (strlen(name) != sizeof(XATTR_NAME_ACL_DEFAULT)-1)
|
|
return -EINVAL;
|
|
if (!IS_ERR (*acl) && *acl) {
|
|
posix_acl_release (*acl);
|
|
*acl = ERR_PTR (-ENODATA);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
posix_acl_default_list (struct inode *inode, const char *name, int namelen, char *out)
|
|
{
|
|
int len = namelen;
|
|
if (!reiserfs_posixacl (inode->i_sb))
|
|
return 0;
|
|
if (out)
|
|
memcpy (out, name, len);
|
|
|
|
return len;
|
|
}
|
|
|
|
struct reiserfs_xattr_handler posix_acl_default_handler = {
|
|
.prefix = XATTR_NAME_ACL_DEFAULT,
|
|
.get = posix_acl_default_get,
|
|
.set = posix_acl_default_set,
|
|
.del = posix_acl_default_del,
|
|
.list = posix_acl_default_list,
|
|
};
|
|
|