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linux/fs/orangefs/devpvfs2-req.c

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Orangefs: kernel client part 2 Signed-off-by: Mike Marshall <hubcap@omnibond.com>
2015-07-17 17:38:12 +03:00
/*
* (C) 2001 Clemson University and The University of Chicago
*
* Changes by Acxiom Corporation to add protocol version to kernel
* communication, Copyright Acxiom Corporation, 2005.
*
* See COPYING in top-level directory.
*/
#include "protocol.h"
#include "pvfs2-kernel.h"
#include "pvfs2-dev-proto.h"
#include "pvfs2-bufmap.h"
#include <linux/debugfs.h>
#include <linux/slab.h>
/* this file implements the /dev/pvfs2-req device node */
static int open_access_count;
#define DUMP_DEVICE_ERROR() \
do { \
gossip_err("*****************************************************\n");\
gossip_err("PVFS2 Device Error: You cannot open the device file "); \
gossip_err("\n/dev/%s more than once. Please make sure that\nthere " \
"are no ", PVFS2_REQDEVICE_NAME); \
gossip_err("instances of a program using this device\ncurrently " \
"running. (You must verify this!)\n"); \
gossip_err("For example, you can use the lsof program as follows:\n");\
gossip_err("'lsof | grep %s' (run this as root)\n", \
PVFS2_REQDEVICE_NAME); \
gossip_err(" open_access_count = %d\n", open_access_count); \
gossip_err("*****************************************************\n");\
} while (0)
static int hash_func(__u64 tag, int table_size)
{
return tag % ((unsigned int)table_size);
}
static void pvfs2_devreq_add_op(struct pvfs2_kernel_op_s *op)
{
int index = hash_func(op->tag, hash_table_size);
spin_lock(&htable_ops_in_progress_lock);
list_add_tail(&op->list, &htable_ops_in_progress[index]);
spin_unlock(&htable_ops_in_progress_lock);
}
static struct pvfs2_kernel_op_s *pvfs2_devreq_remove_op(__u64 tag)
{
struct pvfs2_kernel_op_s *op, *next;
int index;
index = hash_func(tag, hash_table_size);
spin_lock(&htable_ops_in_progress_lock);
list_for_each_entry_safe(op,
next,
&htable_ops_in_progress[index],
list) {
if (op->tag == tag) {
list_del(&op->list);
spin_unlock(&htable_ops_in_progress_lock);
return op;
}
}
spin_unlock(&htable_ops_in_progress_lock);
return NULL;
}
static int pvfs2_devreq_open(struct inode *inode, struct file *file)
{
int ret = -EINVAL;
if (!(file->f_flags & O_NONBLOCK)) {
gossip_err("pvfs2: device cannot be opened in blocking mode\n");
goto out;
}
ret = -EACCES;
gossip_debug(GOSSIP_DEV_DEBUG, "pvfs2-client-core: opening device\n");
mutex_lock(&devreq_mutex);
if (open_access_count == 0) {
ret = generic_file_open(inode, file);
if (ret == 0)
open_access_count++;
} else {
DUMP_DEVICE_ERROR();
}
mutex_unlock(&devreq_mutex);
out:
gossip_debug(GOSSIP_DEV_DEBUG,
"pvfs2-client-core: open device complete (ret = %d)\n",
ret);
return ret;
}
static ssize_t pvfs2_devreq_read(struct file *file,
char __user *buf,
size_t count, loff_t *offset)
{
int ret = 0;
ssize_t len = 0;
struct pvfs2_kernel_op_s *cur_op = NULL;
static __s32 magic = PVFS2_DEVREQ_MAGIC;
__s32 proto_ver = PVFS_KERNEL_PROTO_VERSION;
if (!(file->f_flags & O_NONBLOCK)) {
/* We do not support blocking reads/opens any more */
gossip_err("pvfs2: blocking reads are not supported! (pvfs2-client-core bug)\n");
return -EINVAL;
} else {
struct pvfs2_kernel_op_s *op = NULL, *temp = NULL;
/* get next op (if any) from top of list */
spin_lock(&pvfs2_request_list_lock);
list_for_each_entry_safe(op, temp, &pvfs2_request_list, list) {
__s32 fsid = fsid_of_op(op);
/*
* Check if this op's fsid is known and needs
* remounting
*/
if (fsid != PVFS_FS_ID_NULL &&
fs_mount_pending(fsid) == 1) {
gossip_debug(GOSSIP_DEV_DEBUG,
"Skipping op tag %llu %s\n",
llu(op->tag),
get_opname_string(op));
continue;
} else {
/*
* op does not belong to any particular fsid
* or already mounted.. let it through
*/
cur_op = op;
spin_lock(&cur_op->lock);
list_del(&cur_op->list);
cur_op->op_linger_tmp--;
/*
* if there is a trailer, re-add it to
* the request list.
*/
if (cur_op->op_linger == 2 &&
cur_op->op_linger_tmp == 1) {
if (cur_op->upcall.trailer_size <= 0 ||
cur_op->upcall.trailer_buf == NULL)
gossip_err("BUG:trailer_size is %ld and trailer buf is %p\n", (long)cur_op->upcall.trailer_size, cur_op->upcall.trailer_buf);
/* re-add it to the head of the list */
list_add(&cur_op->list,
&pvfs2_request_list);
}
spin_unlock(&cur_op->lock);
break;
}
}
spin_unlock(&pvfs2_request_list_lock);
}
if (cur_op) {
spin_lock(&cur_op->lock);
gossip_debug(GOSSIP_DEV_DEBUG,
"client-core: reading op tag %llu %s\n",
llu(cur_op->tag), get_opname_string(cur_op));
if (op_state_in_progress(cur_op) || op_state_serviced(cur_op)) {
if (cur_op->op_linger == 1)
gossip_err("WARNING: Current op already queued...skipping\n");
} else if (cur_op->op_linger == 1 ||
(cur_op->op_linger == 2 &&
cur_op->op_linger_tmp == 0)) {
/*
* atomically move the operation to the
* htable_ops_in_progress
*/
set_op_state_inprogress(cur_op);
pvfs2_devreq_add_op(cur_op);
}
spin_unlock(&cur_op->lock);
/* 2 cases
* a) OPs with no trailers
* b) OPs with trailers, Stage 1
* Either way push the upcall out
*/
if (cur_op->op_linger == 1 ||
(cur_op->op_linger == 2 && cur_op->op_linger_tmp == 1)) {
len = MAX_ALIGNED_DEV_REQ_UPSIZE;
if ((size_t) len <= count) {
ret = copy_to_user(buf,
&proto_ver,
sizeof(__s32));
if (ret == 0) {
ret = copy_to_user(buf + sizeof(__s32),
&magic,
sizeof(__s32));
if (ret == 0) {
ret = copy_to_user(buf+2 * sizeof(__s32),
&cur_op->tag,
sizeof(__u64));
if (ret == 0) {
ret = copy_to_user(
buf +
2 *
sizeof(__s32) +
sizeof(__u64),
&cur_op->upcall,
sizeof(struct pvfs2_upcall_s));
}
}
}
if (ret) {
gossip_err("Failed to copy data to user space\n");
len = -EFAULT;
}
} else {
gossip_err
("Failed to copy data to user space\n");
len = -EIO;
}
}
/* Stage 2: Push the trailer out */
else if (cur_op->op_linger == 2 && cur_op->op_linger_tmp == 0) {
len = cur_op->upcall.trailer_size;
if ((size_t) len <= count) {
ret = copy_to_user(buf,
cur_op->upcall.trailer_buf,
len);
if (ret) {
gossip_err("Failed to copy trailer to user space\n");
len = -EFAULT;
}
} else {
gossip_err("Read buffer for trailer is too small (%ld as opposed to %ld)\n",
(long)count,
(long)len);
len = -EIO;
}
} else {
gossip_err("cur_op: %p (op_linger %d), (op_linger_tmp %d), erroneous request list?\n",
cur_op,
cur_op->op_linger,
cur_op->op_linger_tmp);
len = 0;
}
} else if (file->f_flags & O_NONBLOCK) {
/*
* if in non-blocking mode, return EAGAIN since no requests are
* ready yet
*/
len = -EAGAIN;
}
return len;
}
/* Function for writev() callers into the device */
static ssize_t pvfs2_devreq_writev(struct file *file,
const struct iovec *iov,
size_t count,
loff_t *offset)
{
struct pvfs2_kernel_op_s *op = NULL;
void *buffer = NULL;
void *ptr = NULL;
unsigned long i = 0;
static int max_downsize = MAX_ALIGNED_DEV_REQ_DOWNSIZE;
int ret = 0, num_remaining = max_downsize;
int notrailer_count = 4; /* num elements in iovec without trailer */
int payload_size = 0;
__s32 magic = 0;
__s32 proto_ver = 0;
__u64 tag = 0;
ssize_t total_returned_size = 0;
/* Either there is a trailer or there isn't */
if (count != notrailer_count && count != (notrailer_count + 1)) {
gossip_err("Error: Number of iov vectors is (%ld) and notrailer count is %d\n",
count,
notrailer_count);
return -EPROTO;
}
buffer = dev_req_alloc();
if (!buffer)
return -ENOMEM;
ptr = buffer;
for (i = 0; i < notrailer_count; i++) {
if (iov[i].iov_len > num_remaining) {
gossip_err
("writev error: Freeing buffer and returning\n");
dev_req_release(buffer);
return -EMSGSIZE;
}
ret = copy_from_user(ptr, iov[i].iov_base, iov[i].iov_len);
if (ret) {
gossip_err("Failed to copy data from user space\n");
dev_req_release(buffer);
return -EIO;
}
num_remaining -= iov[i].iov_len;
ptr += iov[i].iov_len;
payload_size += iov[i].iov_len;
}
total_returned_size = payload_size;
/* these elements are currently 8 byte aligned (8 bytes for (version +
* magic) 8 bytes for tag). If you add another element, either
* make it 8 bytes big, or use get_unaligned when asigning.
*/
ptr = buffer;
proto_ver = *((__s32 *) ptr);
ptr += sizeof(__s32);
magic = *((__s32 *) ptr);
ptr += sizeof(__s32);
tag = *((__u64 *) ptr);
ptr += sizeof(__u64);
if (magic != PVFS2_DEVREQ_MAGIC) {
gossip_err("Error: Device magic number does not match.\n");
dev_req_release(buffer);
return -EPROTO;
}
/*
* proto_ver = 20902 for 2.9.2
*/
op = pvfs2_devreq_remove_op(tag);
if (op) {
/* Increase ref count! */
get_op(op);
/* cut off magic and tag from payload size */
payload_size -= (2 * sizeof(__s32) + sizeof(__u64));
if (payload_size <= sizeof(struct pvfs2_downcall_s))
/* copy the passed in downcall into the op */
memcpy(&op->downcall,
ptr,
sizeof(struct pvfs2_downcall_s));
else
gossip_debug(GOSSIP_DEV_DEBUG,
"writev: Ignoring %d bytes\n",
payload_size);
/* Do not allocate needlessly if client-core forgets
* to reset trailer size on op errors.
*/
if (op->downcall.status == 0 && op->downcall.trailer_size > 0) {
gossip_debug(GOSSIP_DEV_DEBUG,
"writev: trailer size %ld\n",
(unsigned long)op->downcall.trailer_size);
if (count != (notrailer_count + 1)) {
gossip_err("Error: trailer size (%ld) is non-zero, no trailer elements though? (%ld)\n", (unsigned long)op->downcall.trailer_size, count);
dev_req_release(buffer);
put_op(op);
return -EPROTO;
}
if (iov[notrailer_count].iov_len >
op->downcall.trailer_size) {
gossip_err("writev error: trailer size (%ld) != iov_len (%ld)\n", (unsigned long)op->downcall.trailer_size, (unsigned long)iov[notrailer_count].iov_len);
dev_req_release(buffer);
put_op(op);
return -EMSGSIZE;
}
/* Allocate a buffer large enough to hold the
* trailer bytes.
*/
op->downcall.trailer_buf =
vmalloc(op->downcall.trailer_size);
if (op->downcall.trailer_buf != NULL) {
gossip_debug(GOSSIP_DEV_DEBUG, "vmalloc: %p\n",
op->downcall.trailer_buf);
ret = copy_from_user(op->downcall.trailer_buf,
iov[notrailer_count].
iov_base,
iov[notrailer_count].
iov_len);
if (ret) {
gossip_err("Failed to copy trailer data from user space\n");
dev_req_release(buffer);
gossip_debug(GOSSIP_DEV_DEBUG,
"vfree: %p\n",
op->downcall.trailer_buf);
vfree(op->downcall.trailer_buf);
op->downcall.trailer_buf = NULL;
put_op(op);
return -EIO;
}
} else {
/* Change downcall status */
op->downcall.status = -ENOMEM;
gossip_err("writev: could not vmalloc for trailer!\n");
}
}
/* if this operation is an I/O operation and if it was
* initiated on behalf of a *synchronous* VFS I/O operation,
* only then we need to wait
* for all data to be copied before we can return to avoid
* buffer corruption and races that can pull the buffers
* out from under us.
*
* Essentially we're synchronizing with other parts of the
* vfs implicitly by not allowing the user space
* application reading/writing this device to return until
* the buffers are done being used.
*/
if ((op->upcall.type == PVFS2_VFS_OP_FILE_IO &&
op->upcall.req.io.async_vfs_io == PVFS_VFS_SYNC_IO) ||
op->upcall.type == PVFS2_VFS_OP_FILE_IOX) {
int timed_out = 0;
DECLARE_WAITQUEUE(wait_entry, current);
/* tell the vfs op waiting on a waitqueue
* that this op is done
*/
spin_lock(&op->lock);
set_op_state_serviced(op);
spin_unlock(&op->lock);
add_wait_queue_exclusive(&op->io_completion_waitq,
&wait_entry);
wake_up_interruptible(&op->waitq);
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
spin_lock(&op->lock);
if (op->io_completed) {
spin_unlock(&op->lock);
break;
}
spin_unlock(&op->lock);
if (!signal_pending(current)) {
int timeout =
MSECS_TO_JIFFIES(1000 *
op_timeout_secs);
if (!schedule_timeout(timeout)) {
gossip_debug(GOSSIP_DEV_DEBUG, "*** I/O wait time is up\n");
timed_out = 1;
break;
}
continue;
}
gossip_debug(GOSSIP_DEV_DEBUG, "*** signal on I/O wait -- aborting\n");
break;
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&op->io_completion_waitq,
&wait_entry);
/* NOTE: for I/O operations we handle releasing the op
* object except in the case of timeout. the reason we
* can't free the op in timeout cases is that the op
* service logic in the vfs retries operations using
* the same op ptr, thus it can't be freed.
*/
if (!timed_out)
op_release(op);
} else {
/*
* tell the vfs op waiting on a waitqueue that
* this op is done
*/
spin_lock(&op->lock);
set_op_state_serviced(op);
spin_unlock(&op->lock);
/*
for every other operation (i.e. non-I/O), we need to
wake up the callers for downcall completion
notification
*/
wake_up_interruptible(&op->waitq);
}
} else {
/* ignore downcalls that we're not interested in */
gossip_debug(GOSSIP_DEV_DEBUG,
"WARNING: No one's waiting for tag %llu\n",
llu(tag));
}
dev_req_release(buffer);
return total_returned_size;
}
static ssize_t pvfs2_devreq_write_iter(struct kiocb *iocb,
struct iov_iter *iter)
{
return pvfs2_devreq_writev(iocb->ki_filp,
iter->iov,
iter->nr_segs,
&iocb->ki_pos);
}
/* Returns whether any FS are still pending remounted */
static int mark_all_pending_mounts(void)
{
int unmounted = 1;
struct pvfs2_sb_info_s *pvfs2_sb = NULL;
spin_lock(&pvfs2_superblocks_lock);
list_for_each_entry(pvfs2_sb, &pvfs2_superblocks, list) {
/* All of these file system require a remount */
pvfs2_sb->mount_pending = 1;
unmounted = 0;
}
spin_unlock(&pvfs2_superblocks_lock);
return unmounted;
}
/*
* Determine if a given file system needs to be remounted or not
* Returns -1 on error
* 0 if already mounted
* 1 if needs remount
*/
int fs_mount_pending(__s32 fsid)
{
int mount_pending = -1;
struct pvfs2_sb_info_s *pvfs2_sb = NULL;
spin_lock(&pvfs2_superblocks_lock);
list_for_each_entry(pvfs2_sb, &pvfs2_superblocks, list) {
if (pvfs2_sb->fs_id == fsid) {
mount_pending = pvfs2_sb->mount_pending;
break;
}
}
spin_unlock(&pvfs2_superblocks_lock);
return mount_pending;
}
/*
* 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 pvfs_bufmap_finalize, and similar such tricky
* situations
*/
static int pvfs2_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);
pvfs_bufmap_finalize();
open_access_count--;
unmounted = mark_all_pending_mounts();
gossip_debug(GOSSIP_DEV_DEBUG, "PVFS2 Device Close: Filesystem(s) %s\n",
(unmounted ? "UNMOUNTED" : "MOUNTED"));
mutex_unlock(&devreq_mutex);
/*
* Walk through the list of ops in the request list, mark them
* as purged and wake them up.
*/
purge_waiting_ops();
/*
* Walk through the hash table of in progress operations; mark
* them as purged and wake them up
*/
purge_inprogress_ops();
gossip_debug(GOSSIP_DEV_DEBUG,
"pvfs2-client-core: device close complete\n");
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;
}
static inline long check_ioctl_command(unsigned int command)
{
/* Check for valid ioctl codes */
if (_IOC_TYPE(command) != PVFS_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),
PVFS_DEV_MAGIC);
return -EINVAL;
}
/* and valid ioctl commands */
if (_IOC_NR(command) >= PVFS_DEV_MAXNR || _IOC_NR(command) <= 0) {
gossip_err("Invalid ioctl command number [%d >= %d]\n",
_IOC_NR(command), PVFS_DEV_MAXNR);
return -ENOIOCTLCMD;
}
return 0;
}
static long dispatch_ioctl_command(unsigned int command, unsigned long arg)
{
static __s32 magic = PVFS2_DEVREQ_MAGIC;
static __s32 max_up_size = MAX_ALIGNED_DEV_REQ_UPSIZE;
static __s32 max_down_size = MAX_ALIGNED_DEV_REQ_DOWNSIZE;
struct PVFS_dev_map_desc user_desc;
int ret = 0;
struct dev_mask_info_s mask_info = { 0 };
struct dev_mask2_info_s mask2_info = { 0, 0 };
int upstream_kmod = 1;
struct list_head *tmp = NULL;
struct pvfs2_sb_info_s *pvfs2_sb = NULL;
/* mtmoore: add locking here */
switch (command) {
case PVFS_DEV_GET_MAGIC:
return ((put_user(magic, (__s32 __user *) arg) == -EFAULT) ?
-EIO :
0);
case PVFS_DEV_GET_MAX_UPSIZE:
return ((put_user(max_up_size,
(__s32 __user *) arg) == -EFAULT) ?
-EIO :
0);
case PVFS_DEV_GET_MAX_DOWNSIZE:
return ((put_user(max_down_size,
(__s32 __user *) arg) == -EFAULT) ?
-EIO :
0);
case PVFS_DEV_MAP:
ret = copy_from_user(&user_desc,
(struct PVFS_dev_map_desc __user *)
arg,
sizeof(struct PVFS_dev_map_desc));
return ret ? -EIO : pvfs_bufmap_initialize(&user_desc);
case PVFS_DEV_REMOUNT_ALL:
gossip_debug(GOSSIP_DEV_DEBUG,
"pvfs2_devreq_ioctl: got PVFS_DEV_REMOUNT_ALL\n");
/*
* remount all mounted pvfs2 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 semaphore 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(&request_mutex);
if (ret < 0)
return ret;
gossip_debug(GOSSIP_DEV_DEBUG,
"pvfs2_devreq_ioctl: priority remount in progress\n");
list_for_each(tmp, &pvfs2_superblocks) {
pvfs2_sb =
list_entry(tmp, struct pvfs2_sb_info_s, list);
if (pvfs2_sb && (pvfs2_sb->sb)) {
gossip_debug(GOSSIP_DEV_DEBUG,
"Remounting SB %p\n",
pvfs2_sb);
ret = pvfs2_remount(pvfs2_sb->sb);
if (ret) {
gossip_debug(GOSSIP_DEV_DEBUG,
"SB %p remount failed\n",
pvfs2_sb);
break;
}
}
}
gossip_debug(GOSSIP_DEV_DEBUG,
"pvfs2_devreq_ioctl: priority remount complete\n");
mutex_unlock(&request_mutex);
return ret;
case PVFS_DEV_UPSTREAM:
ret = copy_to_user((void __user *)arg,
&upstream_kmod,
sizeof(upstream_kmod));
if (ret != 0)
return -EIO;
else
return ret;
case PVFS_DEV_CLIENT_MASK:
ret = copy_from_user(&mask2_info,
(void __user *)arg,
sizeof(struct dev_mask2_info_s));
if (ret != 0)
return -EIO;
client_debug_mask.mask1 = mask2_info.mask1_value;
client_debug_mask.mask2 = mask2_info.mask2_value;
pr_info("%s: client debug mask has been been received "
":%llx: :%llx:\n",
__func__,
(unsigned long long)client_debug_mask.mask1,
(unsigned long long)client_debug_mask.mask2);
return ret;
case PVFS_DEV_CLIENT_STRING:
ret = copy_from_user(&client_debug_array_string,
(void __user *)arg,
PVFS2_MAX_DEBUG_STRING_LEN);
if (ret != 0) {
pr_info("%s: "
"PVFS_DEV_CLIENT_STRING: copy_from_user failed"
"\n",
__func__);
return -EIO;
}
pr_info("%s: client debug array string has been been received."
"\n",
__func__);
if (!help_string_initialized) {
/* Free the "we don't know yet" default string... */
kfree(debug_help_string);
/* build a proper debug help string */
if (orangefs_prepare_debugfs_help_string(0)) {
gossip_err("%s: "
"prepare_debugfs_help_string failed"
"\n",
__func__);
return -EIO;
}
/* Replace the boilerplate boot-time debug-help file. */
debugfs_remove(help_file_dentry);
help_file_dentry =
debugfs_create_file(
ORANGEFS_KMOD_DEBUG_HELP_FILE,
0444,
debug_dir,
debug_help_string,
&debug_help_fops);
if (!help_file_dentry) {
gossip_err("%s: debugfs_create_file failed for"
" :%s:!\n",
__func__,
ORANGEFS_KMOD_DEBUG_HELP_FILE);
return -EIO;
}
}
debug_mask_to_string(&client_debug_mask, 1);
debugfs_remove(client_debug_dentry);
pvfs2_client_debug_init();
help_string_initialized++;
return ret;
case PVFS_DEV_DEBUG:
ret = copy_from_user(&mask_info,
(void __user *)arg,
sizeof(mask_info));
if (ret != 0)
return -EIO;
if (mask_info.mask_type == KERNEL_MASK) {
if ((mask_info.mask_value == 0)
&& (kernel_mask_set_mod_init)) {
/*
* the kernel debug mask was set when the
* kernel module was loaded; don't override
* it if the client-core was started without
* a value for PVFS2_KMODMASK.
*/
return 0;
}
debug_mask_to_string(&mask_info.mask_value,
mask_info.mask_type);
gossip_debug_mask = mask_info.mask_value;
pr_info("PVFS: kernel debug mask has been modified to "
":%s: :%llx:\n",
kernel_debug_string,
(unsigned long long)gossip_debug_mask);
} else if (mask_info.mask_type == CLIENT_MASK) {
debug_mask_to_string(&mask_info.mask_value,
mask_info.mask_type);
pr_info("PVFS: client debug mask has been modified to"
":%s: :%llx:\n",
client_debug_string,
llu(mask_info.mask_value));
} else {
gossip_lerr("Invalid mask type....\n");
return -EINVAL;
}
return ret;
default:
return -ENOIOCTLCMD;
}
return -ENOIOCTLCMD;
}
static long pvfs2_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 PVFS_DEV_MAP ioctl */
struct PVFS_dev_map_desc32 {
compat_uptr_t ptr;
__s32 total_size;
__s32 size;
__s32 count;
};
static unsigned long translate_dev_map26(unsigned long args, long *error)
{
struct PVFS_dev_map_desc32 __user *p32 = (void __user *)args;
/*
* Depending on the architecture, allocate some space on the
* user-call-stack based on our expected layout.
*/
struct PVFS_dev_map_desc __user *p =
compat_alloc_user_space(sizeof(*p));
u32 addr;
*error = 0;
/* get the ptr from the 32 bit user-space */
if (get_user(addr, &p32->ptr))
goto err;
/* try to put that into a 64-bit layout */
if (put_user(compat_ptr(addr), &p->ptr))
goto err;
/* copy the remaining fields */
if (copy_in_user(&p->total_size, &p32->total_size, sizeof(__s32)))
goto err;
if (copy_in_user(&p->size, &p32->size, sizeof(__s32)))
goto err;
if (copy_in_user(&p->count, &p32->count, sizeof(__s32)))
goto err;
return (unsigned long)p;
err:
*error = -EFAULT;
return 0;
}
/*
* 32 bit user-space apps' ioctl handlers when kernel modules
* is compiled as a 64 bit one
*/
static long pvfs2_devreq_compat_ioctl(struct file *filp, unsigned int cmd,
unsigned long args)
{
long ret;
unsigned long arg = args;
/* Check for properly constructed commands */
ret = check_ioctl_command(cmd);
if (ret < 0)
return ret;
if (cmd == PVFS_DEV_MAP) {
/*
* convert the arguments to what we expect internally
* in kernel space
*/
arg = translate_dev_map26(args, &ret);
if (ret < 0) {
gossip_err("Could not translate dev map\n");
return ret;
}
}
/* no other ioctl requires translation */
return dispatch_ioctl_command(cmd, arg);
}
static int pvfs2_ioctl32_init(void)
{
return 0;
}
static void pvfs2_ioctl32_cleanup(void)
{
return;
}
#endif /* CONFIG_COMPAT is in .config */
/* the assigned character device major number */
static int pvfs2_dev_major;
/*
* Initialize pvfs2 device specific state:
* Must be called at module load time only
*/
int pvfs2_dev_init(void)
{
int ret;
/* register the ioctl32 sub-system */
ret = pvfs2_ioctl32_init();
if (ret < 0)
return ret;
/* register pvfs2-req device */
pvfs2_dev_major = register_chrdev(0,
PVFS2_REQDEVICE_NAME,
&pvfs2_devreq_file_operations);
if (pvfs2_dev_major < 0) {
gossip_debug(GOSSIP_DEV_DEBUG,
"Failed to register /dev/%s (error %d)\n",
PVFS2_REQDEVICE_NAME, pvfs2_dev_major);
pvfs2_ioctl32_cleanup();
return pvfs2_dev_major;
}
gossip_debug(GOSSIP_DEV_DEBUG,
"*** /dev/%s character device registered ***\n",
PVFS2_REQDEVICE_NAME);
gossip_debug(GOSSIP_DEV_DEBUG, "'mknod /dev/%s c %d 0'.\n",
PVFS2_REQDEVICE_NAME, pvfs2_dev_major);
return 0;
}
void pvfs2_dev_cleanup(void)
{
unregister_chrdev(pvfs2_dev_major, PVFS2_REQDEVICE_NAME);
gossip_debug(GOSSIP_DEV_DEBUG,
"*** /dev/%s character device unregistered ***\n",
PVFS2_REQDEVICE_NAME);
/* unregister the ioctl32 sub-system */
pvfs2_ioctl32_cleanup();
}
static unsigned int pvfs2_devreq_poll(struct file *file,
struct poll_table_struct *poll_table)
{
int poll_revent_mask = 0;
if (open_access_count == 1) {
poll_wait(file, &pvfs2_request_list_waitq, poll_table);
spin_lock(&pvfs2_request_list_lock);
if (!list_empty(&pvfs2_request_list))
poll_revent_mask |= POLL_IN;
spin_unlock(&pvfs2_request_list_lock);
}
return poll_revent_mask;
}
const struct file_operations pvfs2_devreq_file_operations = {
.owner = THIS_MODULE,
.read = pvfs2_devreq_read,
.write_iter = pvfs2_devreq_write_iter,
.open = pvfs2_devreq_open,
.release = pvfs2_devreq_release,
.unlocked_ioctl = pvfs2_devreq_ioctl,
#ifdef CONFIG_COMPAT /* CONFIG_COMPAT is in .config */
.compat_ioctl = pvfs2_devreq_compat_ioctl,
#endif
.poll = pvfs2_devreq_poll
};
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