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Commit 55752a3a authored by Miklos Szeredi's avatar Miklos Szeredi
Browse files

fuse: multiplex cached/direct_io file operations 



This is cleanup, as well as allowing switching between I/O modes while the
file is open in the future.

Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent d4136d60

fs/fuse/file.c

+34 −37
Original line number Diff line number Diff line
@@ -19,8 +19,6 @@ 
#include <linux/falloc.h>

#include <linux/uio.h>



static const struct file_operations fuse_direct_io_file_operations;



static int fuse_send_open(struct fuse_conn *fc, u64 nodeid, struct file *file,

			  int opcode, struct fuse_open_out *outargp)

{
@@ -174,8 +172,6 @@ void fuse_finish_open(struct inode *inode, struct file *file) 
	struct fuse_file *ff = file->private_data;

	struct fuse_conn *fc = get_fuse_conn(inode);



	if (ff->open_flags & FOPEN_DIRECT_IO)

		file->f_op = &fuse_direct_io_file_operations;

	if (!(ff->open_flags & FOPEN_KEEP_CACHE))

		invalidate_inode_pages2(inode->i_mapping);

	if (ff->open_flags & FOPEN_NONSEEKABLE)
@@ -929,7 +925,7 @@ static int fuse_readpages(struct file *file, struct address_space *mapping, 
	return err;

}



static ssize_t fuse_file_read_iter(struct kiocb *iocb, struct iov_iter *to)

static ssize_t fuse_cache_read_iter(struct kiocb *iocb, struct iov_iter *to)

{

	struct inode *inode = iocb->ki_filp->f_mapping->host;

	struct fuse_conn *fc = get_fuse_conn(inode);
@@ -1183,7 +1179,7 @@ static ssize_t fuse_perform_write(struct kiocb *iocb, 
	return res > 0 ? res : err;

}



static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from)

static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)

{

	struct file *file = iocb->ki_filp;

	struct address_space *mapping = file->f_mapping;
@@ -1486,6 +1482,26 @@ static ssize_t fuse_direct_write_iter(struct kiocb *iocb, struct iov_iter *from) 
	return res;

}



static ssize_t fuse_file_read_iter(struct kiocb *iocb, struct iov_iter *to)

{

	struct fuse_file *ff = iocb->ki_filp->private_data;



	if (!(ff->open_flags & FOPEN_DIRECT_IO))

		return fuse_cache_read_iter(iocb, to);

	else

		return fuse_direct_read_iter(iocb, to);

}



static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from)

{

	struct fuse_file *ff = iocb->ki_filp->private_data;



	if (!(ff->open_flags & FOPEN_DIRECT_IO))

		return fuse_cache_write_iter(iocb, from);

	else

		return fuse_direct_write_iter(iocb, from);

}



static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req)

{

	int i;
@@ -2129,16 +2145,9 @@ static const struct vm_operations_struct fuse_file_vm_ops = { 


static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma)

{

	if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE))

		fuse_link_write_file(file);



	file_accessed(file);

	vma->vm_ops = &fuse_file_vm_ops;

	return 0;

}

	struct fuse_file *ff = file->private_data;



static int fuse_direct_mmap(struct file *file, struct vm_area_struct *vma)

{

	if (ff->open_flags & FOPEN_DIRECT_IO) {

		/* Can't provide the coherency needed for MAP_SHARED */

		if (vma->vm_flags & VM_MAYSHARE)

			return -ENODEV;
@@ -2148,6 +2157,14 @@ static int fuse_direct_mmap(struct file *file, struct vm_area_struct *vma) 
		return generic_file_mmap(file, vma);

	}



	if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE))

		fuse_link_write_file(file);



	file_accessed(file);

	vma->vm_ops = &fuse_file_vm_ops;

	return 0;

}



static int convert_fuse_file_lock(struct fuse_conn *fc,

				  const struct fuse_file_lock *ffl,

				  struct file_lock *fl)
@@ -3164,26 +3181,6 @@ static const struct file_operations fuse_file_operations = { 
	.copy_file_range = fuse_copy_file_range,

};



static const struct file_operations fuse_direct_io_file_operations = {

	.llseek		= fuse_file_llseek,

	.read_iter	= fuse_direct_read_iter,

	.write_iter	= fuse_direct_write_iter,

	.mmap		= fuse_direct_mmap,

	.open		= fuse_open,

	.flush		= fuse_flush,

	.release	= fuse_release,

	.fsync		= fuse_fsync,

	.lock		= fuse_file_lock,

	.flock		= fuse_file_flock,

	.splice_read	= generic_file_splice_read,

	.splice_write	= iter_file_splice_write,

	.unlocked_ioctl	= fuse_file_ioctl,

	.compat_ioctl	= fuse_file_compat_ioctl,

	.poll		= fuse_file_poll,

	.fallocate	= fuse_file_fallocate,

	.copy_file_range = fuse_copy_file_range,

};



static const struct address_space_operations fuse_file_aops  = {

	.readpage	= fuse_readpage,

	.writepage	= fuse_writepage,