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