/* * linux/fs/9p/vfs_file.c * * This file contians vfs file ops for 9P2000. * * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to: * Free Software Foundation * 51 Franklin Street, Fifth Floor * Boston, MA 02111-1301 USA * */ #include <linux/module.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/sched.h> #include <linux/file.h> #include <linux/stat.h> #include <linux/string.h> #include <linux/inet.h> #include <linux/list.h> #include <asm/uaccess.h> #include <linux/idr.h> #include "debug.h" #include "v9fs.h" #include "9p.h" #include "v9fs_vfs.h" #include "fid.h" static const struct file_operations v9fs_cached_file_operations; /** * v9fs_file_open - open a file (or directory) * @inode: inode to be opened * @file: file being opened * */ int v9fs_file_open(struct inode *inode, struct file *file) { struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); struct v9fs_fid *vfid; struct v9fs_fcall *fcall = NULL; int omode; int err; dprintk(DEBUG_VFS, "inode: %p file: %p \n", inode, file); vfid = v9fs_fid_clone(file->f_path.dentry); if (IS_ERR(vfid)) return PTR_ERR(vfid); omode = v9fs_uflags2omode(file->f_flags); err = v9fs_t_open(v9ses, vfid->fid, omode, &fcall); if (err < 0) { PRINT_FCALL_ERROR("open failed", fcall); goto Clunk_Fid; } file->private_data = vfid; vfid->fidopen = 1; vfid->fidclunked = 0; vfid->iounit = fcall->params.ropen.iounit; vfid->rdir_pos = 0; vfid->rdir_fcall = NULL; vfid->filp = file; kfree(fcall); if((vfid->qid.version) && (v9ses->cache)) { dprintk(DEBUG_VFS, "cached"); /* enable cached file options */ if(file->f_op == &v9fs_file_operations) file->f_op = &v9fs_cached_file_operations; } return 0; Clunk_Fid: v9fs_fid_clunk(v9ses, vfid); kfree(fcall); return err; } /** * v9fs_file_lock - lock a file (or directory) * @inode: inode to be opened * @file: file being opened * * XXX - this looks like a local only lock, we should extend into 9P * by using open exclusive */ static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl) { int res = 0; struct inode *inode = filp->f_path.dentry->d_inode; dprintk(DEBUG_VFS, "filp: %p lock: %p\n", filp, fl); /* No mandatory locks */ if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) return -ENOLCK; if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { filemap_write_and_wait(inode->i_mapping); invalidate_mapping_pages(&inode->i_data, 0, -1); } return res; } /** * v9fs_file_read - read from a file * @filep: file pointer to read * @data: data buffer to read data into * @count: size of buffer * @offset: offset at which to read data * */ static ssize_t v9fs_file_read(struct file *filp, char __user * data, size_t count, loff_t * offset) { struct inode *inode = filp->f_path.dentry->d_inode; struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); struct v9fs_fid *v9f = filp->private_data; struct v9fs_fcall *fcall = NULL; int fid = v9f->fid; int rsize = 0; int result = 0; int total = 0; int n; dprintk(DEBUG_VFS, "\n"); rsize = v9ses->maxdata - V9FS_IOHDRSZ; if (v9f->iounit != 0 && rsize > v9f->iounit) rsize = v9f->iounit; do { if (count < rsize) rsize = count; result = v9fs_t_read(v9ses, fid, *offset, rsize, &fcall); if (result < 0) { printk(KERN_ERR "9P2000: v9fs_t_read returned %d\n", result); kfree(fcall); return total; } else *offset += result; n = copy_to_user(data, fcall->params.rread.data, result); if (n) { dprintk(DEBUG_ERROR, "Problem copying to user %d\n", n); kfree(fcall); return -EFAULT; } count -= result; data += result; total += result; kfree(fcall); if (result < rsize) break; } while (count); return total; } /** * v9fs_file_write - write to a file * @filep: file pointer to write * @data: data buffer to write data from * @count: size of buffer * @offset: offset at which to write data * */ static ssize_t v9fs_file_write(struct file *filp, const char __user * data, size_t count, loff_t * offset) { struct inode *inode = filp->f_path.dentry->d_inode; struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); struct v9fs_fid *v9fid = filp->private_data; struct v9fs_fcall *fcall; int fid = v9fid->fid; int result = -EIO; int rsize = 0; int total = 0; dprintk(DEBUG_VFS, "data %p count %d offset %x\n", data, (int)count, (int)*offset); rsize = v9ses->maxdata - V9FS_IOHDRSZ; if (v9fid->iounit != 0 && rsize > v9fid->iounit) rsize = v9fid->iounit; do { if (count < rsize) rsize = count; result = v9fs_t_write(v9ses, fid, *offset, rsize, data, &fcall); if (result < 0) { PRINT_FCALL_ERROR("error while writing", fcall); kfree(fcall); return result; } else *offset += result; kfree(fcall); fcall = NULL; if (result != rsize) { eprintk(KERN_ERR, "short write: v9fs_t_write returned %d\n", result); break; } count -= result; data += result; total += result; } while (count); invalidate_inode_pages2(inode->i_mapping); return total; } static const struct file_operations v9fs_cached_file_operations = { .llseek = generic_file_llseek, .read = do_sync_read, .aio_read = generic_file_aio_read, .write = v9fs_file_write, .open = v9fs_file_open, .release = v9fs_dir_release, .lock = v9fs_file_lock, .mmap = generic_file_mmap, }; const struct file_operations v9fs_file_operations = { .llseek = generic_file_llseek, .read = v9fs_file_read, .write = v9fs_file_write, .open = v9fs_file_open, .release = v9fs_dir_release, .lock = v9fs_file_lock, .mmap = generic_file_mmap, };