root/fs/hfsplus/ioctl.c

DEFINITIONS

1. hfsplus_ioctl
2. hfsplus_setxattr
3. hfsplus_getxattr
4. hfsplus_listxattr

/*
 *  linux/fs/hfsplus/ioctl.c
 *
 * Copyright (C) 2003
 * Ethan Benson <erbenson@alaska.net>
 * partially derived from linux/fs/ext2/ioctl.c
 * Copyright (C) 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 * hfsplus ioctls
 */

#include <linux/capability.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/sched.h>
#include <linux/xattr.h>
#include <asm/uaccess.h>
#include "hfsplus_fs.h"

int hfsplus_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
                  unsigned long arg)
{
        unsigned int flags;

        switch (cmd) {
        case HFSPLUS_IOC_EXT2_GETFLAGS:
                flags = 0;
                if (HFSPLUS_I(inode).rootflags & HFSPLUS_FLG_IMMUTABLE)
                        flags |= FS_IMMUTABLE_FL; /* EXT2_IMMUTABLE_FL */
                if (HFSPLUS_I(inode).rootflags & HFSPLUS_FLG_APPEND)
                        flags |= FS_APPEND_FL; /* EXT2_APPEND_FL */
                if (HFSPLUS_I(inode).userflags & HFSPLUS_FLG_NODUMP)
                        flags |= FS_NODUMP_FL; /* EXT2_NODUMP_FL */
                return put_user(flags, (int __user *)arg);
        case HFSPLUS_IOC_EXT2_SETFLAGS: {
                int err = 0;
                err = mnt_want_write(filp->f_path.mnt);
                if (err)
                        return err;

                if (!is_owner_or_cap(inode)) {
                        err = -EACCES;
                        goto setflags_out;
                }
                if (get_user(flags, (int __user *)arg)) {
                        err = -EFAULT;
                        goto setflags_out;
                }
                if (flags & (FS_IMMUTABLE_FL|FS_APPEND_FL) ||
                    HFSPLUS_I(inode).rootflags & (HFSPLUS_FLG_IMMUTABLE|HFSPLUS_FLG_APPEND)) {
                        if (!capable(CAP_LINUX_IMMUTABLE)) {
                                err = -EPERM;
                                goto setflags_out;
                        }
                }

                /* don't silently ignore unsupported ext2 flags */
                if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) {
                        err = -EOPNOTSUPP;
                        goto setflags_out;
                }
                if (flags & FS_IMMUTABLE_FL) { /* EXT2_IMMUTABLE_FL */
                        inode->i_flags |= S_IMMUTABLE;
                        HFSPLUS_I(inode).rootflags |= HFSPLUS_FLG_IMMUTABLE;
                } else {
                        inode->i_flags &= ~S_IMMUTABLE;
                        HFSPLUS_I(inode).rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
                }
                if (flags & FS_APPEND_FL) { /* EXT2_APPEND_FL */
                        inode->i_flags |= S_APPEND;
                        HFSPLUS_I(inode).rootflags |= HFSPLUS_FLG_APPEND;
                } else {
                        inode->i_flags &= ~S_APPEND;
                        HFSPLUS_I(inode).rootflags &= ~HFSPLUS_FLG_APPEND;
                }
                if (flags & FS_NODUMP_FL) /* EXT2_NODUMP_FL */
                        HFSPLUS_I(inode).userflags |= HFSPLUS_FLG_NODUMP;
                else
                        HFSPLUS_I(inode).userflags &= ~HFSPLUS_FLG_NODUMP;

                inode->i_ctime = CURRENT_TIME_SEC;
                mark_inode_dirty(inode);
setflags_out:
                mnt_drop_write(filp->f_path.mnt);
                return err;
        }
        default:
                return -ENOTTY;
        }
}

int hfsplus_setxattr(struct dentry *dentry, const char *name,
                     const void *value, size_t size, int flags)
{
        struct inode *inode = dentry->d_inode;
        struct hfs_find_data fd;
        hfsplus_cat_entry entry;
        struct hfsplus_cat_file *file;
        int res;

        if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
                return -EOPNOTSUPP;

        res = hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
        if (res)
                return res;
        res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
        if (res)
                goto out;
        hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
                        sizeof(struct hfsplus_cat_file));
        file = &entry.file;

        if (!strcmp(name, "hfs.type")) {
                if (size == 4)
                        memcpy(&file->user_info.fdType, value, 4);
                else
                        res = -ERANGE;
        } else if (!strcmp(name, "hfs.creator")) {
                if (size == 4)
                        memcpy(&file->user_info.fdCreator, value, 4);
                else
                        res = -ERANGE;
        } else
                res = -EOPNOTSUPP;
        if (!res)
                hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
                                sizeof(struct hfsplus_cat_file));
out:
        hfs_find_exit(&fd);
        return res;
}

ssize_t hfsplus_getxattr(struct dentry *dentry, const char *name,
                         void *value, size_t size)
{
        struct inode *inode = dentry->d_inode;
        struct hfs_find_data fd;
        hfsplus_cat_entry entry;
        struct hfsplus_cat_file *file;
        ssize_t res = 0;

        if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
                return -EOPNOTSUPP;

        if (size) {
                res = hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
                if (res)
                        return res;
                res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
                if (res)
                        goto out;
                hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
                                sizeof(struct hfsplus_cat_file));
        }
        file = &entry.file;

        if (!strcmp(name, "hfs.type")) {
                if (size >= 4) {
                        memcpy(value, &file->user_info.fdType, 4);
                        res = 4;
                } else
                        res = size ? -ERANGE : 4;
        } else if (!strcmp(name, "hfs.creator")) {
                if (size >= 4) {
                        memcpy(value, &file->user_info.fdCreator, 4);
                        res = 4;
                } else
                        res = size ? -ERANGE : 4;
        } else
                res = -ENODATA;
out:
        if (size)
                hfs_find_exit(&fd);
        return res;
}

#define HFSPLUS_ATTRLIST_SIZE (sizeof("hfs.creator")+sizeof("hfs.type"))

ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
        struct inode *inode = dentry->d_inode;

        if (!S_ISREG(inode->i_mode) || HFSPLUS_IS_RSRC(inode))
                return -EOPNOTSUPP;

        if (!buffer || !size)
                return HFSPLUS_ATTRLIST_SIZE;
        if (size < HFSPLUS_ATTRLIST_SIZE)
                return -ERANGE;
        strcpy(buffer, "hfs.type");
        strcpy(buffer + sizeof("hfs.type"), "hfs.creator");

        return HFSPLUS_ATTRLIST_SIZE;
}