/* * linux/fs/ext3/xattr_user.c * Handler for extended user attributes. * * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org> */ #include <linux/module.h> #include <linux/string.h> #include <linux/fs.h> #include <linux/smp_lock.h> #include <linux/ext3_jbd.h> #include <linux/ext3_fs.h> #include "xattr.h" #ifdef CONFIG_EXT3_FS_POSIX_ACL # include "acl.h" #endif #define XATTR_USER_PREFIX "user." static size_t ext3_xattr_user_list(char *list, struct inode *inode, const char *name, int name_len) { const int prefix_len = sizeof(XATTR_USER_PREFIX)-1; if (!test_opt(inode->i_sb, XATTR_USER)) return 0; if (list) { memcpy(list, XATTR_USER_PREFIX, prefix_len); memcpy(list+prefix_len, name, name_len); } return prefix_len + name_len; } static int ext3_xattr_user_get(struct inode *inode, const char *name, void *buffer, size_t size) { int error; if (strcmp(name, "") == 0) return -EINVAL; if (!test_opt(inode->i_sb, XATTR_USER)) return -EOPNOTSUPP; #ifdef CONFIG_EXT3_FS_POSIX_ACL error = ext3_permission_locked(inode, MAY_READ); #else error = permission(inode, MAY_READ); #endif if (error) return error; return ext3_xattr_get(inode, EXT3_XATTR_INDEX_USER, name, buffer, size); } static int ext3_xattr_user_set(struct inode *inode, const char *name, const void *value, size_t size, int flags) { handle_t *handle; int error; if (strcmp(name, "") == 0) return -EINVAL; if (!test_opt(inode->i_sb, XATTR_USER)) return -EOPNOTSUPP; if ( !S_ISREG(inode->i_mode) && (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX)) return -EPERM; #ifdef CONFIG_EXT3_FS_POSIX_ACL error = ext3_permission_locked(inode, MAY_WRITE); #else error = permission(inode, MAY_WRITE); #endif if (error) return error; lock_kernel(); handle = ext3_journal_start(inode, EXT3_XATTR_TRANS_BLOCKS); if (IS_ERR(handle)) return PTR_ERR(handle); error = ext3_xattr_set(handle, inode, EXT3_XATTR_INDEX_USER, name, value, size, flags); ext3_journal_stop(handle, inode); unlock_kernel(); return error; } struct ext3_xattr_handler ext3_xattr_user_handler = { prefix: XATTR_USER_PREFIX, list: ext3_xattr_user_list, get: ext3_xattr_user_get, set: ext3_xattr_user_set, };