815 lines
22 KiB
C
815 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* (C) 2001 Clemson University and The University of Chicago
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*
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* Changes by Acxiom Corporation to add protocol version to kernel
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* communication, Copyright Acxiom Corporation, 2005.
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*
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* See COPYING in top-level directory.
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*/
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#include "protocol.h"
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#include "orangefs-kernel.h"
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#include "orangefs-dev-proto.h"
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#include "orangefs-bufmap.h"
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#include "orangefs-debugfs.h"
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#include <linux/debugfs.h>
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#include <linux/slab.h>
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/* this file implements the /dev/pvfs2-req device node */
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uint32_t orangefs_userspace_version;
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static int open_access_count;
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static DEFINE_MUTEX(devreq_mutex);
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#define DUMP_DEVICE_ERROR() \
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do { \
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gossip_err("*****************************************************\n");\
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gossip_err("ORANGEFS Device Error: You cannot open the device file "); \
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gossip_err("\n/dev/%s more than once. Please make sure that\nthere " \
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"are no ", ORANGEFS_REQDEVICE_NAME); \
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gossip_err("instances of a program using this device\ncurrently " \
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"running. (You must verify this!)\n"); \
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gossip_err("For example, you can use the lsof program as follows:\n");\
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gossip_err("'lsof | grep %s' (run this as root)\n", \
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ORANGEFS_REQDEVICE_NAME); \
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gossip_err(" open_access_count = %d\n", open_access_count); \
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gossip_err("*****************************************************\n");\
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} while (0)
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static int hash_func(__u64 tag, int table_size)
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{
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return do_div(tag, (unsigned int)table_size);
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}
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static void orangefs_devreq_add_op(struct orangefs_kernel_op_s *op)
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{
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int index = hash_func(op->tag, hash_table_size);
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list_add_tail(&op->list, &orangefs_htable_ops_in_progress[index]);
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}
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/*
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* find the op with this tag and remove it from the in progress
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* hash table.
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*/
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static struct orangefs_kernel_op_s *orangefs_devreq_remove_op(__u64 tag)
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{
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struct orangefs_kernel_op_s *op, *next;
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int index;
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index = hash_func(tag, hash_table_size);
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spin_lock(&orangefs_htable_ops_in_progress_lock);
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list_for_each_entry_safe(op,
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next,
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&orangefs_htable_ops_in_progress[index],
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list) {
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if (op->tag == tag && !op_state_purged(op) &&
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!op_state_given_up(op)) {
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list_del_init(&op->list);
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spin_unlock(&orangefs_htable_ops_in_progress_lock);
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return op;
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}
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}
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spin_unlock(&orangefs_htable_ops_in_progress_lock);
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return NULL;
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}
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/* Returns whether any FS are still pending remounted */
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static int mark_all_pending_mounts(void)
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{
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int unmounted = 1;
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struct orangefs_sb_info_s *orangefs_sb = NULL;
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spin_lock(&orangefs_superblocks_lock);
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list_for_each_entry(orangefs_sb, &orangefs_superblocks, list) {
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/* All of these file system require a remount */
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orangefs_sb->mount_pending = 1;
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unmounted = 0;
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}
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spin_unlock(&orangefs_superblocks_lock);
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return unmounted;
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}
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/*
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* Determine if a given file system needs to be remounted or not
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* Returns -1 on error
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* 0 if already mounted
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* 1 if needs remount
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*/
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static int fs_mount_pending(__s32 fsid)
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{
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int mount_pending = -1;
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struct orangefs_sb_info_s *orangefs_sb = NULL;
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spin_lock(&orangefs_superblocks_lock);
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list_for_each_entry(orangefs_sb, &orangefs_superblocks, list) {
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if (orangefs_sb->fs_id == fsid) {
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mount_pending = orangefs_sb->mount_pending;
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break;
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}
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}
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spin_unlock(&orangefs_superblocks_lock);
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return mount_pending;
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}
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static int orangefs_devreq_open(struct inode *inode, struct file *file)
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{
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int ret = -EINVAL;
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/* in order to ensure that the filesystem driver sees correct UIDs */
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if (file->f_cred->user_ns != &init_user_ns) {
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gossip_err("%s: device cannot be opened outside init_user_ns\n",
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__func__);
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goto out;
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}
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if (!(file->f_flags & O_NONBLOCK)) {
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gossip_err("%s: device cannot be opened in blocking mode\n",
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__func__);
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goto out;
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}
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ret = -EACCES;
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gossip_debug(GOSSIP_DEV_DEBUG, "client-core: opening device\n");
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mutex_lock(&devreq_mutex);
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if (open_access_count == 0) {
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open_access_count = 1;
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ret = 0;
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} else {
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DUMP_DEVICE_ERROR();
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}
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mutex_unlock(&devreq_mutex);
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out:
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gossip_debug(GOSSIP_DEV_DEBUG,
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"pvfs2-client-core: open device complete (ret = %d)\n",
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ret);
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return ret;
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}
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/* Function for read() callers into the device */
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static ssize_t orangefs_devreq_read(struct file *file,
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char __user *buf,
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size_t count, loff_t *offset)
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{
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struct orangefs_kernel_op_s *op, *temp;
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__s32 proto_ver = ORANGEFS_KERNEL_PROTO_VERSION;
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static __s32 magic = ORANGEFS_DEVREQ_MAGIC;
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struct orangefs_kernel_op_s *cur_op;
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unsigned long ret;
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/* We do not support blocking IO. */
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if (!(file->f_flags & O_NONBLOCK)) {
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gossip_err("%s: blocking read from client-core.\n",
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__func__);
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return -EINVAL;
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}
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/*
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* The client will do an ioctl to find MAX_DEV_REQ_UPSIZE, then
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* always read with that size buffer.
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*/
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if (count != MAX_DEV_REQ_UPSIZE) {
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gossip_err("orangefs: client-core tried to read wrong size\n");
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return -EINVAL;
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}
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/* Check for an empty list before locking. */
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if (list_empty(&orangefs_request_list))
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return -EAGAIN;
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restart:
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cur_op = NULL;
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/* Get next op (if any) from top of list. */
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spin_lock(&orangefs_request_list_lock);
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list_for_each_entry_safe(op, temp, &orangefs_request_list, list) {
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__s32 fsid;
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/* This lock is held past the end of the loop when we break. */
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spin_lock(&op->lock);
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if (unlikely(op_state_purged(op) || op_state_given_up(op))) {
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spin_unlock(&op->lock);
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continue;
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}
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fsid = fsid_of_op(op);
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if (fsid != ORANGEFS_FS_ID_NULL) {
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int ret;
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/* Skip ops whose filesystem needs to be mounted. */
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ret = fs_mount_pending(fsid);
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if (ret == 1) {
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gossip_debug(GOSSIP_DEV_DEBUG,
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"%s: mount pending, skipping op tag "
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"%llu %s\n",
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__func__,
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llu(op->tag),
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get_opname_string(op));
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spin_unlock(&op->lock);
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continue;
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/*
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* Skip ops whose filesystem we don't know about unless
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* it is being mounted or unmounted. It is possible for
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* a filesystem we don't know about to be unmounted if
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* it fails to mount in the kernel after userspace has
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* been sent the mount request.
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*/
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/* XXX: is there a better way to detect this? */
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} else if (ret == -1 &&
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!(op->upcall.type ==
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ORANGEFS_VFS_OP_FS_MOUNT ||
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op->upcall.type ==
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ORANGEFS_VFS_OP_GETATTR ||
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op->upcall.type ==
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ORANGEFS_VFS_OP_FS_UMOUNT)) {
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gossip_debug(GOSSIP_DEV_DEBUG,
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"orangefs: skipping op tag %llu %s\n",
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llu(op->tag), get_opname_string(op));
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gossip_err(
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"orangefs: ERROR: fs_mount_pending %d\n",
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fsid);
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spin_unlock(&op->lock);
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continue;
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}
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}
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/*
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* Either this op does not pertain to a filesystem, is mounting
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* a filesystem, or pertains to a mounted filesystem. Let it
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* through.
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*/
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cur_op = op;
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break;
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}
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/*
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* At this point we either have a valid op and can continue or have not
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* found an op and must ask the client to try again later.
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*/
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if (!cur_op) {
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spin_unlock(&orangefs_request_list_lock);
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return -EAGAIN;
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}
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gossip_debug(GOSSIP_DEV_DEBUG, "%s: reading op tag %llu %s\n",
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__func__,
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llu(cur_op->tag),
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get_opname_string(cur_op));
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/*
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* Such an op should never be on the list in the first place. If so, we
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* will abort.
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*/
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if (op_state_in_progress(cur_op) || op_state_serviced(cur_op)) {
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gossip_err("orangefs: ERROR: Current op already queued.\n");
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list_del_init(&cur_op->list);
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spin_unlock(&cur_op->lock);
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spin_unlock(&orangefs_request_list_lock);
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return -EAGAIN;
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}
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list_del_init(&cur_op->list);
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spin_unlock(&orangefs_request_list_lock);
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spin_unlock(&cur_op->lock);
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/* Push the upcall out. */
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ret = copy_to_user(buf, &proto_ver, sizeof(__s32));
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if (ret != 0)
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goto error;
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ret = copy_to_user(buf + sizeof(__s32), &magic, sizeof(__s32));
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if (ret != 0)
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goto error;
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ret = copy_to_user(buf + 2 * sizeof(__s32),
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&cur_op->tag,
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sizeof(__u64));
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if (ret != 0)
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goto error;
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ret = copy_to_user(buf + 2 * sizeof(__s32) + sizeof(__u64),
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&cur_op->upcall,
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sizeof(struct orangefs_upcall_s));
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if (ret != 0)
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goto error;
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spin_lock(&orangefs_htable_ops_in_progress_lock);
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spin_lock(&cur_op->lock);
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if (unlikely(op_state_given_up(cur_op))) {
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spin_unlock(&cur_op->lock);
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spin_unlock(&orangefs_htable_ops_in_progress_lock);
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complete(&cur_op->waitq);
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goto restart;
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}
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/*
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* Set the operation to be in progress and move it between lists since
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* it has been sent to the client.
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*/
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set_op_state_inprogress(cur_op);
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gossip_debug(GOSSIP_DEV_DEBUG,
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"%s: 1 op:%s: op_state:%d: process:%s:\n",
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__func__,
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get_opname_string(cur_op),
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cur_op->op_state,
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current->comm);
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orangefs_devreq_add_op(cur_op);
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spin_unlock(&cur_op->lock);
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spin_unlock(&orangefs_htable_ops_in_progress_lock);
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/* The client only asks to read one size buffer. */
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return MAX_DEV_REQ_UPSIZE;
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error:
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/*
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* We were unable to copy the op data to the client. Put the op back in
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* list. If client has crashed, the op will be purged later when the
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* device is released.
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*/
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gossip_err("orangefs: Failed to copy data to user space\n");
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spin_lock(&orangefs_request_list_lock);
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spin_lock(&cur_op->lock);
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if (likely(!op_state_given_up(cur_op))) {
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set_op_state_waiting(cur_op);
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gossip_debug(GOSSIP_DEV_DEBUG,
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"%s: 2 op:%s: op_state:%d: process:%s:\n",
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__func__,
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get_opname_string(cur_op),
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cur_op->op_state,
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current->comm);
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list_add(&cur_op->list, &orangefs_request_list);
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spin_unlock(&cur_op->lock);
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} else {
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spin_unlock(&cur_op->lock);
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complete(&cur_op->waitq);
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}
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spin_unlock(&orangefs_request_list_lock);
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return -EFAULT;
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}
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/*
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* Function for writev() callers into the device.
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*
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* Userspace should have written:
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* - __u32 version
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* - __u32 magic
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* - __u64 tag
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* - struct orangefs_downcall_s
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* - trailer buffer (in the case of READDIR operations)
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*/
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static ssize_t orangefs_devreq_write_iter(struct kiocb *iocb,
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struct iov_iter *iter)
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{
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ssize_t ret;
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struct orangefs_kernel_op_s *op = NULL;
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struct {
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__u32 version;
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__u32 magic;
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__u64 tag;
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} head;
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int total = ret = iov_iter_count(iter);
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int downcall_size = sizeof(struct orangefs_downcall_s);
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int head_size = sizeof(head);
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gossip_debug(GOSSIP_DEV_DEBUG, "%s: total:%d: ret:%zd:\n",
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__func__,
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total,
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ret);
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if (total < MAX_DEV_REQ_DOWNSIZE) {
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gossip_err("%s: total:%d: must be at least:%u:\n",
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__func__,
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total,
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(unsigned int) MAX_DEV_REQ_DOWNSIZE);
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return -EFAULT;
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}
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if (!copy_from_iter_full(&head, head_size, iter)) {
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gossip_err("%s: failed to copy head.\n", __func__);
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return -EFAULT;
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}
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if (head.version < ORANGEFS_MINIMUM_USERSPACE_VERSION) {
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gossip_err("%s: userspace claims version"
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"%d, minimum version required: %d.\n",
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__func__,
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head.version,
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ORANGEFS_MINIMUM_USERSPACE_VERSION);
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return -EPROTO;
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}
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if (head.magic != ORANGEFS_DEVREQ_MAGIC) {
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gossip_err("Error: Device magic number does not match.\n");
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return -EPROTO;
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}
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if (!orangefs_userspace_version) {
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orangefs_userspace_version = head.version;
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} else if (orangefs_userspace_version != head.version) {
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gossip_err("Error: userspace version changes\n");
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return -EPROTO;
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}
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|
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/* remove the op from the in progress hash table */
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op = orangefs_devreq_remove_op(head.tag);
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if (!op) {
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gossip_debug(GOSSIP_DEV_DEBUG,
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"%s: No one's waiting for tag %llu\n",
|
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__func__, llu(head.tag));
|
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return ret;
|
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}
|
|
|
|
if (!copy_from_iter_full(&op->downcall, downcall_size, iter)) {
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gossip_err("%s: failed to copy downcall.\n", __func__);
|
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goto Efault;
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}
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|
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if (op->downcall.status)
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goto wakeup;
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|
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/*
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* We've successfully peeled off the head and the downcall.
|
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* Something has gone awry if total doesn't equal the
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* sum of head_size, downcall_size and trailer_size.
|
|
*/
|
|
if ((head_size + downcall_size + op->downcall.trailer_size) != total) {
|
|
gossip_err("%s: funky write, head_size:%d"
|
|
": downcall_size:%d: trailer_size:%lld"
|
|
": total size:%d:\n",
|
|
__func__,
|
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head_size,
|
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downcall_size,
|
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op->downcall.trailer_size,
|
|
total);
|
|
goto Efault;
|
|
}
|
|
|
|
/* Only READDIR operations should have trailers. */
|
|
if ((op->downcall.type != ORANGEFS_VFS_OP_READDIR) &&
|
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(op->downcall.trailer_size != 0)) {
|
|
gossip_err("%s: %x operation with trailer.",
|
|
__func__,
|
|
op->downcall.type);
|
|
goto Efault;
|
|
}
|
|
|
|
/* READDIR operations should always have trailers. */
|
|
if ((op->downcall.type == ORANGEFS_VFS_OP_READDIR) &&
|
|
(op->downcall.trailer_size == 0)) {
|
|
gossip_err("%s: %x operation with no trailer.",
|
|
__func__,
|
|
op->downcall.type);
|
|
goto Efault;
|
|
}
|
|
|
|
if (op->downcall.type != ORANGEFS_VFS_OP_READDIR)
|
|
goto wakeup;
|
|
|
|
op->downcall.trailer_buf = vzalloc(op->downcall.trailer_size);
|
|
if (!op->downcall.trailer_buf)
|
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goto Enomem;
|
|
|
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if (!copy_from_iter_full(op->downcall.trailer_buf,
|
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op->downcall.trailer_size, iter)) {
|
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gossip_err("%s: failed to copy trailer.\n", __func__);
|
|
vfree(op->downcall.trailer_buf);
|
|
goto Efault;
|
|
}
|
|
|
|
wakeup:
|
|
/*
|
|
* Return to vfs waitqueue, and back to service_operation
|
|
* through wait_for_matching_downcall.
|
|
*/
|
|
spin_lock(&op->lock);
|
|
if (unlikely(op_is_cancel(op))) {
|
|
spin_unlock(&op->lock);
|
|
put_cancel(op);
|
|
} else if (unlikely(op_state_given_up(op))) {
|
|
spin_unlock(&op->lock);
|
|
complete(&op->waitq);
|
|
} else {
|
|
set_op_state_serviced(op);
|
|
gossip_debug(GOSSIP_DEV_DEBUG,
|
|
"%s: op:%s: op_state:%d: process:%s:\n",
|
|
__func__,
|
|
get_opname_string(op),
|
|
op->op_state,
|
|
current->comm);
|
|
spin_unlock(&op->lock);
|
|
}
|
|
return ret;
|
|
|
|
Efault:
|
|
op->downcall.status = -(ORANGEFS_ERROR_BIT | 9);
|
|
ret = -EFAULT;
|
|
goto wakeup;
|
|
|
|
Enomem:
|
|
op->downcall.status = -(ORANGEFS_ERROR_BIT | 8);
|
|
ret = -ENOMEM;
|
|
goto wakeup;
|
|
}
|
|
|
|
/*
|
|
* NOTE: gets called when the last reference to this device is dropped.
|
|
* Using the open_access_count variable, we enforce a reference count
|
|
* on this file so that it can be opened by only one process at a time.
|
|
* the devreq_mutex is used to make sure all i/o has completed
|
|
* before we call orangefs_bufmap_finalize, and similar such tricky
|
|
* situations
|
|
*/
|
|
static int orangefs_devreq_release(struct inode *inode, struct file *file)
|
|
{
|
|
int unmounted = 0;
|
|
|
|
gossip_debug(GOSSIP_DEV_DEBUG,
|
|
"%s:pvfs2-client-core: exiting, closing device\n",
|
|
__func__);
|
|
|
|
mutex_lock(&devreq_mutex);
|
|
orangefs_bufmap_finalize();
|
|
|
|
open_access_count = -1;
|
|
|
|
unmounted = mark_all_pending_mounts();
|
|
gossip_debug(GOSSIP_DEV_DEBUG, "ORANGEFS Device Close: Filesystem(s) %s\n",
|
|
(unmounted ? "UNMOUNTED" : "MOUNTED"));
|
|
|
|
purge_waiting_ops();
|
|
purge_inprogress_ops();
|
|
|
|
orangefs_bufmap_run_down();
|
|
|
|
gossip_debug(GOSSIP_DEV_DEBUG,
|
|
"pvfs2-client-core: device close complete\n");
|
|
open_access_count = 0;
|
|
orangefs_userspace_version = 0;
|
|
mutex_unlock(&devreq_mutex);
|
|
return 0;
|
|
}
|
|
|
|
int is_daemon_in_service(void)
|
|
{
|
|
int in_service;
|
|
|
|
/*
|
|
* What this function does is checks if client-core is alive
|
|
* based on the access count we maintain on the device.
|
|
*/
|
|
mutex_lock(&devreq_mutex);
|
|
in_service = open_access_count == 1 ? 0 : -EIO;
|
|
mutex_unlock(&devreq_mutex);
|
|
return in_service;
|
|
}
|
|
|
|
bool __is_daemon_in_service(void)
|
|
{
|
|
return open_access_count == 1;
|
|
}
|
|
|
|
static inline long check_ioctl_command(unsigned int command)
|
|
{
|
|
/* Check for valid ioctl codes */
|
|
if (_IOC_TYPE(command) != ORANGEFS_DEV_MAGIC) {
|
|
gossip_err("device ioctl magic numbers don't match! Did you rebuild pvfs2-client-core/libpvfs2? [cmd %x, magic %x != %x]\n",
|
|
command,
|
|
_IOC_TYPE(command),
|
|
ORANGEFS_DEV_MAGIC);
|
|
return -EINVAL;
|
|
}
|
|
/* and valid ioctl commands */
|
|
if (_IOC_NR(command) >= ORANGEFS_DEV_MAXNR || _IOC_NR(command) <= 0) {
|
|
gossip_err("Invalid ioctl command number [%d >= %d]\n",
|
|
_IOC_NR(command), ORANGEFS_DEV_MAXNR);
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static long dispatch_ioctl_command(unsigned int command, unsigned long arg)
|
|
{
|
|
static __s32 magic = ORANGEFS_DEVREQ_MAGIC;
|
|
static __s32 max_up_size = MAX_DEV_REQ_UPSIZE;
|
|
static __s32 max_down_size = MAX_DEV_REQ_DOWNSIZE;
|
|
struct ORANGEFS_dev_map_desc user_desc;
|
|
int ret = 0;
|
|
int upstream_kmod = 1;
|
|
struct orangefs_sb_info_s *orangefs_sb;
|
|
|
|
/* mtmoore: add locking here */
|
|
|
|
switch (command) {
|
|
case ORANGEFS_DEV_GET_MAGIC:
|
|
return ((put_user(magic, (__s32 __user *) arg) == -EFAULT) ?
|
|
-EIO :
|
|
0);
|
|
case ORANGEFS_DEV_GET_MAX_UPSIZE:
|
|
return ((put_user(max_up_size,
|
|
(__s32 __user *) arg) == -EFAULT) ?
|
|
-EIO :
|
|
0);
|
|
case ORANGEFS_DEV_GET_MAX_DOWNSIZE:
|
|
return ((put_user(max_down_size,
|
|
(__s32 __user *) arg) == -EFAULT) ?
|
|
-EIO :
|
|
0);
|
|
case ORANGEFS_DEV_MAP:
|
|
ret = copy_from_user(&user_desc,
|
|
(struct ORANGEFS_dev_map_desc __user *)
|
|
arg,
|
|
sizeof(struct ORANGEFS_dev_map_desc));
|
|
/* WTF -EIO and not -EFAULT? */
|
|
return ret ? -EIO : orangefs_bufmap_initialize(&user_desc);
|
|
case ORANGEFS_DEV_REMOUNT_ALL:
|
|
gossip_debug(GOSSIP_DEV_DEBUG,
|
|
"%s: got ORANGEFS_DEV_REMOUNT_ALL\n",
|
|
__func__);
|
|
|
|
/*
|
|
* remount all mounted orangefs volumes to regain the lost
|
|
* dynamic mount tables (if any) -- NOTE: this is done
|
|
* without keeping the superblock list locked due to the
|
|
* upcall/downcall waiting. also, the request mutex is
|
|
* used to ensure that no operations will be serviced until
|
|
* all of the remounts are serviced (to avoid ops between
|
|
* mounts to fail)
|
|
*/
|
|
ret = mutex_lock_interruptible(&orangefs_request_mutex);
|
|
if (ret < 0)
|
|
return ret;
|
|
gossip_debug(GOSSIP_DEV_DEBUG,
|
|
"%s: priority remount in progress\n",
|
|
__func__);
|
|
spin_lock(&orangefs_superblocks_lock);
|
|
list_for_each_entry(orangefs_sb, &orangefs_superblocks, list) {
|
|
/*
|
|
* We have to drop the spinlock, so entries can be
|
|
* removed. They can't be freed, though, so we just
|
|
* keep the forward pointers and zero the back ones -
|
|
* that way we can get to the rest of the list.
|
|
*/
|
|
if (!orangefs_sb->list.prev)
|
|
continue;
|
|
gossip_debug(GOSSIP_DEV_DEBUG,
|
|
"%s: Remounting SB %p\n",
|
|
__func__,
|
|
orangefs_sb);
|
|
|
|
spin_unlock(&orangefs_superblocks_lock);
|
|
ret = orangefs_remount(orangefs_sb);
|
|
spin_lock(&orangefs_superblocks_lock);
|
|
if (ret) {
|
|
gossip_debug(GOSSIP_DEV_DEBUG,
|
|
"SB %p remount failed\n",
|
|
orangefs_sb);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&orangefs_superblocks_lock);
|
|
gossip_debug(GOSSIP_DEV_DEBUG,
|
|
"%s: priority remount complete\n",
|
|
__func__);
|
|
mutex_unlock(&orangefs_request_mutex);
|
|
return ret;
|
|
|
|
case ORANGEFS_DEV_UPSTREAM:
|
|
ret = copy_to_user((void __user *)arg,
|
|
&upstream_kmod,
|
|
sizeof(upstream_kmod));
|
|
|
|
if (ret != 0)
|
|
return -EIO;
|
|
else
|
|
return ret;
|
|
|
|
case ORANGEFS_DEV_CLIENT_MASK:
|
|
return orangefs_debugfs_new_client_mask((void __user *)arg);
|
|
case ORANGEFS_DEV_CLIENT_STRING:
|
|
return orangefs_debugfs_new_client_string((void __user *)arg);
|
|
case ORANGEFS_DEV_DEBUG:
|
|
return orangefs_debugfs_new_debug((void __user *)arg);
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
static long orangefs_devreq_ioctl(struct file *file,
|
|
unsigned int command, unsigned long arg)
|
|
{
|
|
long ret;
|
|
|
|
/* Check for properly constructed commands */
|
|
ret = check_ioctl_command(command);
|
|
if (ret < 0)
|
|
return (int)ret;
|
|
|
|
return (int)dispatch_ioctl_command(command, arg);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT /* CONFIG_COMPAT is in .config */
|
|
|
|
/* Compat structure for the ORANGEFS_DEV_MAP ioctl */
|
|
struct ORANGEFS_dev_map_desc32 {
|
|
compat_uptr_t ptr;
|
|
__s32 total_size;
|
|
__s32 size;
|
|
__s32 count;
|
|
};
|
|
|
|
/*
|
|
* 32 bit user-space apps' ioctl handlers when kernel modules
|
|
* is compiled as a 64 bit one
|
|
*/
|
|
static long orangefs_devreq_compat_ioctl(struct file *filp, unsigned int cmd,
|
|
unsigned long args)
|
|
{
|
|
long ret;
|
|
|
|
/* Check for properly constructed commands */
|
|
ret = check_ioctl_command(cmd);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (cmd == ORANGEFS_DEV_MAP) {
|
|
struct ORANGEFS_dev_map_desc desc;
|
|
struct ORANGEFS_dev_map_desc32 d32;
|
|
|
|
if (copy_from_user(&d32, (void __user *)args, sizeof(d32)))
|
|
return -EFAULT;
|
|
|
|
desc.ptr = compat_ptr(d32.ptr);
|
|
desc.total_size = d32.total_size;
|
|
desc.size = d32.size;
|
|
desc.count = d32.count;
|
|
return orangefs_bufmap_initialize(&desc);
|
|
}
|
|
/* no other ioctl requires translation */
|
|
return dispatch_ioctl_command(cmd, args);
|
|
}
|
|
|
|
#endif /* CONFIG_COMPAT is in .config */
|
|
|
|
static __poll_t orangefs_devreq_poll(struct file *file,
|
|
struct poll_table_struct *poll_table)
|
|
{
|
|
__poll_t poll_revent_mask = 0;
|
|
|
|
poll_wait(file, &orangefs_request_list_waitq, poll_table);
|
|
|
|
if (!list_empty(&orangefs_request_list))
|
|
poll_revent_mask |= EPOLLIN;
|
|
return poll_revent_mask;
|
|
}
|
|
|
|
/* the assigned character device major number */
|
|
static int orangefs_dev_major;
|
|
|
|
static const struct file_operations orangefs_devreq_file_operations = {
|
|
.owner = THIS_MODULE,
|
|
.read = orangefs_devreq_read,
|
|
.write_iter = orangefs_devreq_write_iter,
|
|
.open = orangefs_devreq_open,
|
|
.release = orangefs_devreq_release,
|
|
.unlocked_ioctl = orangefs_devreq_ioctl,
|
|
|
|
#ifdef CONFIG_COMPAT /* CONFIG_COMPAT is in .config */
|
|
.compat_ioctl = orangefs_devreq_compat_ioctl,
|
|
#endif
|
|
.poll = orangefs_devreq_poll
|
|
};
|
|
|
|
/*
|
|
* Initialize orangefs device specific state:
|
|
* Must be called at module load time only
|
|
*/
|
|
int orangefs_dev_init(void)
|
|
{
|
|
/* register orangefs-req device */
|
|
orangefs_dev_major = register_chrdev(0,
|
|
ORANGEFS_REQDEVICE_NAME,
|
|
&orangefs_devreq_file_operations);
|
|
if (orangefs_dev_major < 0) {
|
|
gossip_debug(GOSSIP_DEV_DEBUG,
|
|
"Failed to register /dev/%s (error %d)\n",
|
|
ORANGEFS_REQDEVICE_NAME, orangefs_dev_major);
|
|
return orangefs_dev_major;
|
|
}
|
|
|
|
gossip_debug(GOSSIP_DEV_DEBUG,
|
|
"*** /dev/%s character device registered ***\n",
|
|
ORANGEFS_REQDEVICE_NAME);
|
|
gossip_debug(GOSSIP_DEV_DEBUG, "'mknod /dev/%s c %d 0'.\n",
|
|
ORANGEFS_REQDEVICE_NAME, orangefs_dev_major);
|
|
return 0;
|
|
}
|
|
|
|
void orangefs_dev_cleanup(void)
|
|
{
|
|
unregister_chrdev(orangefs_dev_major, ORANGEFS_REQDEVICE_NAME);
|
|
gossip_debug(GOSSIP_DEV_DEBUG,
|
|
"*** /dev/%s character device unregistered ***\n",
|
|
ORANGEFS_REQDEVICE_NAME);
|
|
}
|