/*  FUSE: Filesystem in Userspace  Copyright (C) 2001-2006  Miklos Szeredi <miklos@szeredi.hu>   This program can be distributed under the terms of the GNU GPL.  See the file COPYING.*/ #include "fuse_i.h" #include <linux/pagemap.h>#include <linux/slab.h>#include <linux/kernel.h> static const struct file_operations fuse_direct_io_file_operations; static int fuse_send_open(struct inode *inode, struct file *file, int isdir,			  struct fuse_open_out *outargp){	struct fuse_conn *fc = get_fuse_conn(inode);	struct fuse_open_in inarg;	struct fuse_req *req;	int err; 	req = fuse_get_req(fc);	if (IS_ERR(req))		return PTR_ERR(req); 	memset(&inarg, 0, sizeof(inarg));	inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);	req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN;	req->in.h.nodeid = get_node_id(inode);	req->inode = inode;	req->in.numargs = 1;	req->in.args[0].size = sizeof(inarg);	req->in.args[0].value = &inarg;	req->out.numargs = 1;	req->out.args[0].size = sizeof(*outargp);	req->out.args[0].value = outargp;	request_send(fc, req);	err = req->out.h.error;	fuse_put_request(fc, req); 	return err;} struct fuse_file *fuse_file_alloc(void){	struct fuse_file *ff;	ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL);	if (ff) {		ff->release_req = fuse_request_alloc();		if (!ff->release_req) {			kfree(ff);			ff = NULL;		}	}	return ff;} void fuse_file_free(struct fuse_file *ff){	fuse_request_free(ff->release_req);	kfree(ff);} void fuse_finish_open(struct inode *inode, struct file *file,		      struct fuse_file *ff, struct fuse_open_out *outarg){	if (outarg->open_flags & FOPEN_DIRECT_IO)		file->f_op = &fuse_direct_io_file_operations;	if (!(outarg->open_flags & FOPEN_KEEP_CACHE))		invalidate_inode_pages(inode->i_mapping);	ff->fh = outarg->fh;	file->private_data = ff;} int fuse_open_common(struct inode *inode, struct file *file, int isdir){	struct fuse_open_out outarg;	struct fuse_file *ff;	int err; 	/* VFS checks this, but only _after_ ->open() */	if (file->f_flags & O_DIRECT)		return -EINVAL; 	err = generic_file_open(inode, file);	if (err)		return err; 	/* If opening the root node, no lookup has been performed on	   it, so the attributes must be refreshed */	if (get_node_id(inode) == FUSE_ROOT_ID) {		err = fuse_do_getattr(inode);		if (err)		 	return err;	} 	ff = fuse_file_alloc();	if (!ff)		return -ENOMEM; 	err = fuse_send_open(inode, file, isdir, &outarg);	if (err)		fuse_file_free(ff);	else {		if (isdir)			outarg.open_flags &= ~FOPEN_DIRECT_IO;		fuse_finish_open(inode, file, ff, &outarg);	} 	return err;} /* Special case for failed iget in CREATE */static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req){	/* If called from end_io_requests(), req has more than one	   reference and fuse_reset_request() cannot work */	if (fc->connected) {		u64 nodeid = req->in.h.nodeid;		fuse_reset_request(req);		fuse_send_forget(fc, req, nodeid, 1);	} else		fuse_put_request(fc, req);} void fuse_send_release(struct fuse_conn *fc, struct fuse_file *ff,		       u64 nodeid, struct inode *inode, int flags, int isdir){	struct fuse_req * req = ff->release_req;	struct fuse_release_in *inarg = &req->misc.release_in; 	inarg->fh = ff->fh;	inarg->flags = flags;	req->in.h.opcode = isdir ? FUSE_RELEASEDIR : FUSE_RELEASE;	req->in.h.nodeid = nodeid;	req->inode = inode;	req->in.numargs = 1;	req->in.args[0].size = sizeof(struct fuse_release_in);	req->in.args[0].value = inarg;	request_send_background(fc, req);	if (!inode)		req->end = fuse_release_end;	kfree(ff);} int fuse_release_common(struct inode *inode, struct file *file, int isdir){	struct fuse_file *ff = file->private_data;	if (ff) {		struct fuse_conn *fc = get_fuse_conn(inode);		u64 nodeid = get_node_id(inode);		fuse_send_release(fc, ff, nodeid, inode, file->f_flags, isdir);	} 	/* Return value is ignored by VFS */	return 0;} static int fuse_open(struct inode *inode, struct file *file){	return fuse_open_common(inode, file, 0);} static int fuse_release(struct inode *inode, struct file *file){	return fuse_release_common(inode, file, 0);} static int fuse_flush(struct file *file){	struct inode *inode = file->f_dentry->d_inode;	struct fuse_conn *fc = get_fuse_conn(inode);	struct fuse_file *ff = file->private_data;	struct fuse_req *req;	struct fuse_flush_in inarg;	int err; 	if (is_bad_inode(inode))		return -EIO; 	if (fc->no_flush)		return 0; 	req = fuse_get_req(fc);	if (IS_ERR(req))		return PTR_ERR(req); 	memset(&inarg, 0, sizeof(inarg));	inarg.fh = ff->fh;	req->in.h.opcode = FUSE_FLUSH;	req->in.h.nodeid = get_node_id(inode);	req->inode = inode;	req->file = file;	req->in.numargs = 1;	req->in.args[0].size = sizeof(inarg);	req->in.args[0].value = &inarg;	request_send(fc, req);	err = req->out.h.error;	fuse_put_request(fc, req);	if (err == -ENOSYS) {		fc->no_flush = 1;		err = 0;	}	return err;} int fuse_fsync_common(struct file *file, struct dentry *de, int datasync,		      int isdir){	struct inode *inode = de->d_inode;	struct fuse_conn *fc = get_fuse_conn(inode);	struct fuse_file *ff = file->private_data;	struct fuse_req *req;	struct fuse_fsync_in inarg;	int err; 	if (is_bad_inode(inode))		return -EIO; 	if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir))		return 0; 	req = fuse_get_req(fc);	if (IS_ERR(req))		return PTR_ERR(req); 	memset(&inarg, 0, sizeof(inarg));	inarg.fh = ff->fh;	inarg.fsync_flags = datasync ? 1 : 0;	req->in.h.opcode = isdir ? FUSE_FSYNCDIR : FUSE_FSYNC;	req->in.h.nodeid = get_node_id(inode);	req->inode = inode;	req->file = file;	req->in.numargs = 1;	req->in.args[0].size = sizeof(inarg);	req->in.args[0].value = &inarg;	request_send(fc, req);	err = req->out.h.error;	fuse_put_request(fc, req);	if (err == -ENOSYS) {		if (isdir)			fc->no_fsyncdir = 1;		else			fc->no_fsync = 1;		err = 0;	}	return err;} static int fuse_fsync(struct file *file, struct dentry *de, int datasync){	return fuse_fsync_common(file, de, datasync, 0);} void fuse_read_fill(struct fuse_req *req, struct file *file,		    struct inode *inode, loff_t pos, size_t count, int opcode){	struct fuse_file *ff = file->private_data;	struct fuse_read_in *inarg = &req->misc.read_in; 	inarg->fh = ff->fh;	inarg->offset = pos;	inarg->size = count;	req->in.h.opcode = opcode;	req->in.h.nodeid = get_node_id(inode);	req->inode = inode;	req->file = file;	req->in.numargs = 1;	req->in.args[0].size = sizeof(struct fuse_read_in);	req->in.args[0].value = inarg;	req->out.argpages = 1;	req->out.argvar = 1;	req->out.numargs = 1;	req->out.args[0].size = count;} static size_t fuse_send_read(struct fuse_req *req, struct file *file,			     struct inode *inode, loff_t pos, size_t count){	struct fuse_conn *fc = get_fuse_conn(inode);	fuse_read_fill(req, file, inode, pos, count, FUSE_READ);	request_send(fc, req);	return req->out.args[0].size;} static int fuse_readpage(struct file *file, struct page *page){	struct inode *inode = page->mapping->host;	struct fuse_conn *fc = get_fuse_conn(inode);	struct fuse_req *req;	int err; 	err = -EIO;	if (is_bad_inode(inode))		goto out; 	req = fuse_get_req(fc);	err = PTR_ERR(req);	if (IS_ERR(req))		goto out; 	req->out.page_zeroing = 1;	req->num_pages = 1;	req->pages[0] = page;	fuse_send_read(req, file, inode, page_offset(page), PAGE_CACHE_SIZE);	err = req->out.h.error;	fuse_put_request(fc, req);	if (!err)		SetPageUptodate(page);	fuse_invalidate_attr(inode); /* atime changed */ out:	unlock_page(page);	return err;} static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req){	int i; 	fuse_invalidate_attr(req->pages[0]->mapping->host); /* atime changed */ 	for (i = 0; i < req->num_pages; i++) {		struct page *page = req->pages[i];		if (!req->out.h.error)			SetPageUptodate(page);		else			SetPageError(page);		unlock_page(page);	}	fuse_put_request(fc, req);} static void fuse_send_readpages(struct fuse_req *req, struct file *file,				struct inode *inode){	struct fuse_conn *fc = get_fuse_conn(inode);	loff_t pos = page_offset(req->pages[0]);	size_t count = req->num_pages << PAGE_CACHE_SHIFT;	req->out.page_zeroing = 1;	fuse_read_fill(req, file, inode, pos, count, FUSE_READ);	if (fc->async_read) {		req->end = fuse_readpages_end;		request_send_background(fc, req);	} else {		request_send(fc, req);		fuse_readpages_end(fc, req);	}} struct fuse_readpages_data {	struct fuse_req *req;	struct file *file;	struct inode *inode;}; static int fuse_readpages_fill(void *_data, struct page *page){	struct fuse_readpages_data *data = _data;	struct fuse_req *req = data->req;	struct inode *inode = data->inode;	struct fuse_conn *fc = get_fuse_conn(inode); 	if (req->num_pages &&	    (req->num_pages == FUSE_MAX_PAGES_PER_REQ ||	     (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read ||	     req->pages[req->num_pages - 1]->index + 1 != page->index)) {		fuse_send_readpages(req, data->file, inode);		data->req = req = fuse_get_req(fc);		if (IS_ERR(req)) {			unlock_page(page);			return PTR_ERR(req);		}	}	req->pages[req->num_pages] = page;	req->num_pages ++;	return 0;} static int fuse_readpages(struct file *file, struct address_space *mapping,			  struct list_head *pages, unsigned nr_pages){	struct inode *inode = mapping->host;	struct fuse_conn *fc = get_fuse_conn(inode);	struct fuse_readpages_data data;	int err; 	if (is_bad_inode(inode))		return -EIO; 	data.file = file;	data.inode = inode;	data.req = fuse_get_req(fc);	if (IS_ERR(data.req))		return PTR_ERR(data.req); 	err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data);	if (!err) {		if (data.req->num_pages)			fuse_send_readpages(data.req, file, inode);		else			fuse_put_request(fc, data.req);	}	return err;} static size_t fuse_send_write(struct fuse_req *req, struct file *file,			      struct inode *inode, loff_t pos, size_t count){	struct fuse_conn *fc = get_fuse_conn(inode);	struct fuse_file *ff = file->private_data;	struct fuse_write_in inarg;	struct fuse_write_out outarg; 	memset(&inarg, 0, sizeof(struct fuse_write_in));	inarg.fh = ff->fh;	inarg.offset = pos;	inarg.size = count;	req->in.h.opcode = FUSE_WRITE;	req->in.h.nodeid = get_node_id(inode);	req->inode = inode;	req->file = file;	req->in.argpages = 1;	req->in.numargs = 2;	req->in.args[0].size = sizeof(struct fuse_write_in);	req->in.args[0].value = &inarg;	req->in.args[1].size = count;	req->out.numargs = 1;	req->out.args[0].size = sizeof(struct fuse_write_out);	req->out.args[0].value = &outarg;	request_send(fc, req);	return outarg.size;} static int fuse_prepare_write(struct file *file, struct page *page,			      unsigned offset, unsigned to){	/* No op */	return 0;} static int fuse_commit_write(struct file *file, struct page *page,			     unsigned offset, unsigned to){	int err;	size_t nres;	unsigned count = to - offset;	struct inode *inode = page->mapping->host;	struct fuse_conn *fc = get_fuse_conn(inode);	loff_t pos = page_offset(page) + offset;	struct fuse_req *req; 	if (is_bad_inode(inode))		return -EIO; 	req = fuse_get_req(fc);	if (IS_ERR(req))		return PTR_ERR(req); 	req->num_pages = 1;	req->pages[0] = page;	req->page_offset = offset;	nres = fuse_send_write(req, file, inode, pos, count);	err = req->out.h.error;	fuse_put_request(fc, req);	if (!err && nres != count)		err = -EIO;	if (!err) {		pos += count;		if (pos > i_size_read(inode))			i_size_write(inode, pos); 		if (offset == 0 && to == PAGE_CACHE_SIZE) {			clear_page_dirty(page);			SetPageUptodate(page);		}	}	fuse_invalidate_attr(inode);	return err;} static void fuse_release_user_pages(struct fuse_req *req, int write){	unsigned i; 	for (i = 0; i < req->num_pages; i++) {		struct page *page = req->pages[i];		if (write)			set_page_dirty_lock(page);		put_page(page);	}} static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf,			       unsigned nbytes, int write){	unsigned long user_addr = (unsigned long) buf;	unsigned offset = user_addr & ~PAGE_MASK;

Lines 1–500 of 657. Load more