mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-09 01:28:05 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
917
fs/9p/vfs_file.c
Normal file
917
fs/9p/vfs_file.c
Normal file
|
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@ -0,0 +1,917 @@
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/*
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* linux/fs/9p/vfs_file.c
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*
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* This file contians vfs file ops for 9P2000.
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*
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
|
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/sched.h>
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#include <linux/file.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/inet.h>
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#include <linux/list.h>
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#include <linux/pagemap.h>
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#include <linux/utsname.h>
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#include <asm/uaccess.h>
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#include <linux/idr.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include "v9fs.h"
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#include "v9fs_vfs.h"
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#include "fid.h"
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#include "cache.h"
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static const struct vm_operations_struct v9fs_file_vm_ops;
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static const struct vm_operations_struct v9fs_mmap_file_vm_ops;
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/**
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* v9fs_file_open - open a file (or directory)
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* @inode: inode to be opened
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* @file: file being opened
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*
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*/
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int v9fs_file_open(struct inode *inode, struct file *file)
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{
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int err;
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struct v9fs_inode *v9inode;
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struct v9fs_session_info *v9ses;
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struct p9_fid *fid;
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int omode;
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p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
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v9inode = V9FS_I(inode);
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v9ses = v9fs_inode2v9ses(inode);
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if (v9fs_proto_dotl(v9ses))
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omode = v9fs_open_to_dotl_flags(file->f_flags);
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else
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omode = v9fs_uflags2omode(file->f_flags,
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v9fs_proto_dotu(v9ses));
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fid = file->private_data;
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if (!fid) {
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fid = v9fs_fid_clone(file->f_path.dentry);
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if (IS_ERR(fid))
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return PTR_ERR(fid);
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err = p9_client_open(fid, omode);
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if (err < 0) {
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p9_client_clunk(fid);
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return err;
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}
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if ((file->f_flags & O_APPEND) &&
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(!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
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generic_file_llseek(file, 0, SEEK_END);
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}
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file->private_data = fid;
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mutex_lock(&v9inode->v_mutex);
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if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
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!v9inode->writeback_fid &&
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((file->f_flags & O_ACCMODE) != O_RDONLY)) {
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/*
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* clone a fid and add it to writeback_fid
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* we do it during open time instead of
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* page dirty time via write_begin/page_mkwrite
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* because we want write after unlink usecase
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* to work.
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*/
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fid = v9fs_writeback_fid(file->f_path.dentry);
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if (IS_ERR(fid)) {
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err = PTR_ERR(fid);
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mutex_unlock(&v9inode->v_mutex);
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goto out_error;
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}
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v9inode->writeback_fid = (void *) fid;
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}
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mutex_unlock(&v9inode->v_mutex);
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if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
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v9fs_cache_inode_set_cookie(inode, file);
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return 0;
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out_error:
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p9_client_clunk(file->private_data);
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file->private_data = NULL;
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return err;
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}
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/**
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* v9fs_file_lock - lock a file (or directory)
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* @filp: file to be locked
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* @cmd: lock command
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* @fl: file lock structure
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*
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* Bugs: this looks like a local only lock, we should extend into 9P
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* by using open exclusive
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*/
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static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl)
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{
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int res = 0;
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struct inode *inode = file_inode(filp);
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p9_debug(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
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/* No mandatory locks */
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if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
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return -ENOLCK;
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if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
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filemap_write_and_wait(inode->i_mapping);
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invalidate_mapping_pages(&inode->i_data, 0, -1);
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}
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return res;
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}
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static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
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{
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struct p9_flock flock;
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struct p9_fid *fid;
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uint8_t status;
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int res = 0;
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unsigned char fl_type;
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fid = filp->private_data;
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BUG_ON(fid == NULL);
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if ((fl->fl_flags & FL_POSIX) != FL_POSIX)
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BUG();
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res = posix_lock_file_wait(filp, fl);
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if (res < 0)
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goto out;
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/* convert posix lock to p9 tlock args */
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memset(&flock, 0, sizeof(flock));
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/* map the lock type */
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switch (fl->fl_type) {
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case F_RDLCK:
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flock.type = P9_LOCK_TYPE_RDLCK;
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break;
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case F_WRLCK:
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flock.type = P9_LOCK_TYPE_WRLCK;
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break;
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case F_UNLCK:
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flock.type = P9_LOCK_TYPE_UNLCK;
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break;
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}
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flock.start = fl->fl_start;
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if (fl->fl_end == OFFSET_MAX)
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flock.length = 0;
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else
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flock.length = fl->fl_end - fl->fl_start + 1;
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flock.proc_id = fl->fl_pid;
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flock.client_id = fid->clnt->name;
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if (IS_SETLKW(cmd))
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flock.flags = P9_LOCK_FLAGS_BLOCK;
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/*
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* if its a blocked request and we get P9_LOCK_BLOCKED as the status
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* for lock request, keep on trying
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*/
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for (;;) {
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res = p9_client_lock_dotl(fid, &flock, &status);
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if (res < 0)
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break;
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if (status != P9_LOCK_BLOCKED)
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break;
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if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd))
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break;
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if (schedule_timeout_interruptible(P9_LOCK_TIMEOUT) != 0)
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break;
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}
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/* map 9p status to VFS status */
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switch (status) {
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case P9_LOCK_SUCCESS:
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res = 0;
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break;
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case P9_LOCK_BLOCKED:
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res = -EAGAIN;
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break;
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case P9_LOCK_ERROR:
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case P9_LOCK_GRACE:
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res = -ENOLCK;
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break;
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default:
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BUG();
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}
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/*
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* incase server returned error for lock request, revert
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* it locally
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*/
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if (res < 0 && fl->fl_type != F_UNLCK) {
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fl_type = fl->fl_type;
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fl->fl_type = F_UNLCK;
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res = posix_lock_file_wait(filp, fl);
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fl->fl_type = fl_type;
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}
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out:
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return res;
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}
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static int v9fs_file_getlock(struct file *filp, struct file_lock *fl)
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{
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struct p9_getlock glock;
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struct p9_fid *fid;
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int res = 0;
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fid = filp->private_data;
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BUG_ON(fid == NULL);
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posix_test_lock(filp, fl);
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/*
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* if we have a conflicting lock locally, no need to validate
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* with server
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*/
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if (fl->fl_type != F_UNLCK)
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return res;
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/* convert posix lock to p9 tgetlock args */
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memset(&glock, 0, sizeof(glock));
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glock.type = P9_LOCK_TYPE_UNLCK;
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glock.start = fl->fl_start;
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if (fl->fl_end == OFFSET_MAX)
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glock.length = 0;
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else
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glock.length = fl->fl_end - fl->fl_start + 1;
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glock.proc_id = fl->fl_pid;
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glock.client_id = fid->clnt->name;
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res = p9_client_getlock_dotl(fid, &glock);
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if (res < 0)
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return res;
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/* map 9p lock type to os lock type */
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switch (glock.type) {
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case P9_LOCK_TYPE_RDLCK:
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fl->fl_type = F_RDLCK;
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break;
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case P9_LOCK_TYPE_WRLCK:
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fl->fl_type = F_WRLCK;
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break;
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case P9_LOCK_TYPE_UNLCK:
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fl->fl_type = F_UNLCK;
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break;
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}
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if (glock.type != P9_LOCK_TYPE_UNLCK) {
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fl->fl_start = glock.start;
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if (glock.length == 0)
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fl->fl_end = OFFSET_MAX;
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else
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fl->fl_end = glock.start + glock.length - 1;
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fl->fl_pid = glock.proc_id;
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}
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return res;
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}
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/**
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* v9fs_file_lock_dotl - lock a file (or directory)
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* @filp: file to be locked
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* @cmd: lock command
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* @fl: file lock structure
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*
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*/
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static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl)
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{
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||||
struct inode *inode = file_inode(filp);
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int ret = -ENOLCK;
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p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
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filp, cmd, fl, filp);
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/* No mandatory locks */
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if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
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goto out_err;
|
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|
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if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) {
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filemap_write_and_wait(inode->i_mapping);
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invalidate_mapping_pages(&inode->i_data, 0, -1);
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}
|
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|
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if (IS_SETLK(cmd) || IS_SETLKW(cmd))
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ret = v9fs_file_do_lock(filp, cmd, fl);
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else if (IS_GETLK(cmd))
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ret = v9fs_file_getlock(filp, fl);
|
||||
else
|
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ret = -EINVAL;
|
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out_err:
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_file_flock_dotl - lock a file
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||||
* @filp: file to be locked
|
||||
* @cmd: lock command
|
||||
* @fl: file lock structure
|
||||
*
|
||||
*/
|
||||
|
||||
static int v9fs_file_flock_dotl(struct file *filp, int cmd,
|
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struct file_lock *fl)
|
||||
{
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||||
struct inode *inode = file_inode(filp);
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||||
int ret = -ENOLCK;
|
||||
|
||||
p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
|
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filp, cmd, fl, filp);
|
||||
|
||||
/* No mandatory locks */
|
||||
if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
|
||||
goto out_err;
|
||||
|
||||
if (!(fl->fl_flags & FL_FLOCK))
|
||||
goto out_err;
|
||||
|
||||
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);
|
||||
}
|
||||
/* Convert flock to posix lock */
|
||||
fl->fl_flags |= FL_POSIX;
|
||||
fl->fl_flags ^= FL_FLOCK;
|
||||
|
||||
if (IS_SETLK(cmd) | IS_SETLKW(cmd))
|
||||
ret = v9fs_file_do_lock(filp, cmd, fl);
|
||||
else
|
||||
ret = -EINVAL;
|
||||
out_err:
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_fid_readn - read from a fid
|
||||
* @fid: fid to read
|
||||
* @data: data buffer to read data into
|
||||
* @udata: user data buffer to read data into
|
||||
* @count: size of buffer
|
||||
* @offset: offset at which to read data
|
||||
*
|
||||
*/
|
||||
ssize_t
|
||||
v9fs_fid_readn(struct p9_fid *fid, char *data, char __user *udata, u32 count,
|
||||
u64 offset)
|
||||
{
|
||||
int n, total, size;
|
||||
|
||||
p9_debug(P9_DEBUG_VFS, "fid %d offset %llu count %d\n",
|
||||
fid->fid, (long long unsigned)offset, count);
|
||||
n = 0;
|
||||
total = 0;
|
||||
size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
|
||||
do {
|
||||
n = p9_client_read(fid, data, udata, offset, count);
|
||||
if (n <= 0)
|
||||
break;
|
||||
|
||||
if (data)
|
||||
data += n;
|
||||
if (udata)
|
||||
udata += n;
|
||||
|
||||
offset += n;
|
||||
count -= n;
|
||||
total += n;
|
||||
} while (count > 0 && n == size);
|
||||
|
||||
if (n < 0)
|
||||
total = n;
|
||||
|
||||
return total;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_file_readn - read from a file
|
||||
* @filp: file pointer to read
|
||||
* @data: data buffer to read data into
|
||||
* @udata: user data buffer to read data into
|
||||
* @count: size of buffer
|
||||
* @offset: offset at which to read data
|
||||
*
|
||||
*/
|
||||
ssize_t
|
||||
v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
|
||||
u64 offset)
|
||||
{
|
||||
return v9fs_fid_readn(filp->private_data, data, udata, count, offset);
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_file_read - read from a file
|
||||
* @filp: file pointer to read
|
||||
* @udata: user 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 *udata, size_t count,
|
||||
loff_t * offset)
|
||||
{
|
||||
int ret;
|
||||
struct p9_fid *fid;
|
||||
size_t size;
|
||||
|
||||
p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset);
|
||||
fid = filp->private_data;
|
||||
|
||||
size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
|
||||
if (count > size)
|
||||
ret = v9fs_file_readn(filp, NULL, udata, count, *offset);
|
||||
else
|
||||
ret = p9_client_read(fid, NULL, udata, *offset, count);
|
||||
|
||||
if (ret > 0)
|
||||
*offset += ret;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
ssize_t
|
||||
v9fs_file_write_internal(struct inode *inode, struct p9_fid *fid,
|
||||
const char __user *data, size_t count,
|
||||
loff_t *offset, int invalidate)
|
||||
{
|
||||
int n;
|
||||
loff_t i_size;
|
||||
size_t total = 0;
|
||||
loff_t origin = *offset;
|
||||
unsigned long pg_start, pg_end;
|
||||
|
||||
p9_debug(P9_DEBUG_VFS, "data %p count %d offset %x\n",
|
||||
data, (int)count, (int)*offset);
|
||||
|
||||
do {
|
||||
n = p9_client_write(fid, NULL, data+total, origin+total, count);
|
||||
if (n <= 0)
|
||||
break;
|
||||
count -= n;
|
||||
total += n;
|
||||
} while (count > 0);
|
||||
|
||||
if (invalidate && (total > 0)) {
|
||||
pg_start = origin >> PAGE_CACHE_SHIFT;
|
||||
pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT;
|
||||
if (inode->i_mapping && inode->i_mapping->nrpages)
|
||||
invalidate_inode_pages2_range(inode->i_mapping,
|
||||
pg_start, pg_end);
|
||||
*offset += total;
|
||||
i_size = i_size_read(inode);
|
||||
if (*offset > i_size) {
|
||||
inode_add_bytes(inode, *offset - i_size);
|
||||
i_size_write(inode, *offset);
|
||||
}
|
||||
}
|
||||
if (n < 0)
|
||||
return n;
|
||||
|
||||
return total;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_file_write - write to a file
|
||||
* @filp: 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)
|
||||
{
|
||||
ssize_t retval = 0;
|
||||
loff_t origin = *offset;
|
||||
|
||||
|
||||
retval = generic_write_checks(filp, &origin, &count, 0);
|
||||
if (retval)
|
||||
goto out;
|
||||
|
||||
retval = -EINVAL;
|
||||
if ((ssize_t) count < 0)
|
||||
goto out;
|
||||
retval = 0;
|
||||
if (!count)
|
||||
goto out;
|
||||
|
||||
retval = v9fs_file_write_internal(file_inode(filp),
|
||||
filp->private_data,
|
||||
data, count, &origin, 1);
|
||||
/* update offset on successful write */
|
||||
if (retval > 0)
|
||||
*offset = origin;
|
||||
out:
|
||||
return retval;
|
||||
}
|
||||
|
||||
|
||||
static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end,
|
||||
int datasync)
|
||||
{
|
||||
struct p9_fid *fid;
|
||||
struct inode *inode = filp->f_mapping->host;
|
||||
struct p9_wstat wstat;
|
||||
int retval;
|
||||
|
||||
retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
|
||||
if (retval)
|
||||
return retval;
|
||||
|
||||
mutex_lock(&inode->i_mutex);
|
||||
p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
|
||||
|
||||
fid = filp->private_data;
|
||||
v9fs_blank_wstat(&wstat);
|
||||
|
||||
retval = p9_client_wstat(fid, &wstat);
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
|
||||
int datasync)
|
||||
{
|
||||
struct p9_fid *fid;
|
||||
struct inode *inode = filp->f_mapping->host;
|
||||
int retval;
|
||||
|
||||
retval = filemap_write_and_wait_range(inode->i_mapping, start, end);
|
||||
if (retval)
|
||||
return retval;
|
||||
|
||||
mutex_lock(&inode->i_mutex);
|
||||
p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
|
||||
|
||||
fid = filp->private_data;
|
||||
|
||||
retval = p9_client_fsync(fid, datasync);
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
static int
|
||||
v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma)
|
||||
{
|
||||
int retval;
|
||||
|
||||
|
||||
retval = generic_file_mmap(filp, vma);
|
||||
if (!retval)
|
||||
vma->vm_ops = &v9fs_file_vm_ops;
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
static int
|
||||
v9fs_mmap_file_mmap(struct file *filp, struct vm_area_struct *vma)
|
||||
{
|
||||
int retval;
|
||||
struct inode *inode;
|
||||
struct v9fs_inode *v9inode;
|
||||
struct p9_fid *fid;
|
||||
|
||||
inode = file_inode(filp);
|
||||
v9inode = V9FS_I(inode);
|
||||
mutex_lock(&v9inode->v_mutex);
|
||||
if (!v9inode->writeback_fid &&
|
||||
(vma->vm_flags & VM_WRITE)) {
|
||||
/*
|
||||
* clone a fid and add it to writeback_fid
|
||||
* we do it during mmap instead of
|
||||
* page dirty time via write_begin/page_mkwrite
|
||||
* because we want write after unlink usecase
|
||||
* to work.
|
||||
*/
|
||||
fid = v9fs_writeback_fid(filp->f_path.dentry);
|
||||
if (IS_ERR(fid)) {
|
||||
retval = PTR_ERR(fid);
|
||||
mutex_unlock(&v9inode->v_mutex);
|
||||
return retval;
|
||||
}
|
||||
v9inode->writeback_fid = (void *) fid;
|
||||
}
|
||||
mutex_unlock(&v9inode->v_mutex);
|
||||
|
||||
retval = generic_file_mmap(filp, vma);
|
||||
if (!retval)
|
||||
vma->vm_ops = &v9fs_mmap_file_vm_ops;
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
static int
|
||||
v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
|
||||
{
|
||||
struct v9fs_inode *v9inode;
|
||||
struct page *page = vmf->page;
|
||||
struct file *filp = vma->vm_file;
|
||||
struct inode *inode = file_inode(filp);
|
||||
|
||||
|
||||
p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n",
|
||||
page, (unsigned long)filp->private_data);
|
||||
|
||||
/* Update file times before taking page lock */
|
||||
file_update_time(filp);
|
||||
|
||||
v9inode = V9FS_I(inode);
|
||||
/* make sure the cache has finished storing the page */
|
||||
v9fs_fscache_wait_on_page_write(inode, page);
|
||||
BUG_ON(!v9inode->writeback_fid);
|
||||
lock_page(page);
|
||||
if (page->mapping != inode->i_mapping)
|
||||
goto out_unlock;
|
||||
wait_for_stable_page(page);
|
||||
|
||||
return VM_FAULT_LOCKED;
|
||||
out_unlock:
|
||||
unlock_page(page);
|
||||
return VM_FAULT_NOPAGE;
|
||||
}
|
||||
|
||||
static ssize_t
|
||||
v9fs_direct_read(struct file *filp, char __user *udata, size_t count,
|
||||
loff_t *offsetp)
|
||||
{
|
||||
loff_t size, offset;
|
||||
struct inode *inode;
|
||||
struct address_space *mapping;
|
||||
|
||||
offset = *offsetp;
|
||||
mapping = filp->f_mapping;
|
||||
inode = mapping->host;
|
||||
if (!count)
|
||||
return 0;
|
||||
size = i_size_read(inode);
|
||||
if (offset < size)
|
||||
filemap_write_and_wait_range(mapping, offset,
|
||||
offset + count - 1);
|
||||
|
||||
return v9fs_file_read(filp, udata, count, offsetp);
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_cached_file_read - read from a file
|
||||
* @filp: file pointer to read
|
||||
* @data: user data buffer to read data into
|
||||
* @count: size of buffer
|
||||
* @offset: offset at which to read data
|
||||
*
|
||||
*/
|
||||
static ssize_t
|
||||
v9fs_cached_file_read(struct file *filp, char __user *data, size_t count,
|
||||
loff_t *offset)
|
||||
{
|
||||
if (filp->f_flags & O_DIRECT)
|
||||
return v9fs_direct_read(filp, data, count, offset);
|
||||
return new_sync_read(filp, data, count, offset);
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_mmap_file_read - read from a file
|
||||
* @filp: file pointer to read
|
||||
* @data: user data buffer to read data into
|
||||
* @count: size of buffer
|
||||
* @offset: offset at which to read data
|
||||
*
|
||||
*/
|
||||
static ssize_t
|
||||
v9fs_mmap_file_read(struct file *filp, char __user *data, size_t count,
|
||||
loff_t *offset)
|
||||
{
|
||||
/* TODO: Check if there are dirty pages */
|
||||
return v9fs_file_read(filp, data, count, offset);
|
||||
}
|
||||
|
||||
static ssize_t
|
||||
v9fs_direct_write(struct file *filp, const char __user * data,
|
||||
size_t count, loff_t *offsetp)
|
||||
{
|
||||
loff_t offset;
|
||||
ssize_t retval;
|
||||
struct inode *inode;
|
||||
struct address_space *mapping;
|
||||
|
||||
offset = *offsetp;
|
||||
mapping = filp->f_mapping;
|
||||
inode = mapping->host;
|
||||
if (!count)
|
||||
return 0;
|
||||
|
||||
mutex_lock(&inode->i_mutex);
|
||||
retval = filemap_write_and_wait_range(mapping, offset,
|
||||
offset + count - 1);
|
||||
if (retval)
|
||||
goto err_out;
|
||||
/*
|
||||
* After a write we want buffered reads to be sure to go to disk to get
|
||||
* the new data. We invalidate clean cached page from the region we're
|
||||
* about to write. We do this *before* the write so that if we fail
|
||||
* here we fall back to buffered write
|
||||
*/
|
||||
if (mapping->nrpages) {
|
||||
pgoff_t pg_start = offset >> PAGE_CACHE_SHIFT;
|
||||
pgoff_t pg_end = (offset + count - 1) >> PAGE_CACHE_SHIFT;
|
||||
|
||||
retval = invalidate_inode_pages2_range(mapping,
|
||||
pg_start, pg_end);
|
||||
/*
|
||||
* If a page can not be invalidated, fall back
|
||||
* to buffered write.
|
||||
*/
|
||||
if (retval) {
|
||||
if (retval == -EBUSY)
|
||||
goto buff_write;
|
||||
goto err_out;
|
||||
}
|
||||
}
|
||||
retval = v9fs_file_write(filp, data, count, offsetp);
|
||||
err_out:
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
return retval;
|
||||
|
||||
buff_write:
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
return new_sync_write(filp, data, count, offsetp);
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_cached_file_write - write to a file
|
||||
* @filp: 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_cached_file_write(struct file *filp, const char __user * data,
|
||||
size_t count, loff_t *offset)
|
||||
{
|
||||
|
||||
if (filp->f_flags & O_DIRECT)
|
||||
return v9fs_direct_write(filp, data, count, offset);
|
||||
return new_sync_write(filp, data, count, offset);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* v9fs_mmap_file_write - write to a file
|
||||
* @filp: 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_mmap_file_write(struct file *filp, const char __user *data,
|
||||
size_t count, loff_t *offset)
|
||||
{
|
||||
/*
|
||||
* TODO: invalidate mmaps on filp's inode between
|
||||
* offset and offset+count
|
||||
*/
|
||||
return v9fs_file_write(filp, data, count, offset);
|
||||
}
|
||||
|
||||
static void v9fs_mmap_vm_close(struct vm_area_struct *vma)
|
||||
{
|
||||
struct inode *inode;
|
||||
|
||||
struct writeback_control wbc = {
|
||||
.nr_to_write = LONG_MAX,
|
||||
.sync_mode = WB_SYNC_ALL,
|
||||
.range_start = vma->vm_pgoff * PAGE_SIZE,
|
||||
/* absolute end, byte at end included */
|
||||
.range_end = vma->vm_pgoff * PAGE_SIZE +
|
||||
(vma->vm_end - vma->vm_start - 1),
|
||||
};
|
||||
|
||||
|
||||
p9_debug(P9_DEBUG_VFS, "9p VMA close, %p, flushing", vma);
|
||||
|
||||
inode = file_inode(vma->vm_file);
|
||||
|
||||
if (!mapping_cap_writeback_dirty(inode->i_mapping))
|
||||
wbc.nr_to_write = 0;
|
||||
|
||||
might_sleep();
|
||||
sync_inode(inode, &wbc);
|
||||
}
|
||||
|
||||
|
||||
static const struct vm_operations_struct v9fs_file_vm_ops = {
|
||||
.fault = filemap_fault,
|
||||
.map_pages = filemap_map_pages,
|
||||
.page_mkwrite = v9fs_vm_page_mkwrite,
|
||||
.remap_pages = generic_file_remap_pages,
|
||||
};
|
||||
|
||||
static const struct vm_operations_struct v9fs_mmap_file_vm_ops = {
|
||||
.close = v9fs_mmap_vm_close,
|
||||
.fault = filemap_fault,
|
||||
.map_pages = filemap_map_pages,
|
||||
.page_mkwrite = v9fs_vm_page_mkwrite,
|
||||
.remap_pages = generic_file_remap_pages,
|
||||
};
|
||||
|
||||
|
||||
const struct file_operations v9fs_cached_file_operations = {
|
||||
.llseek = generic_file_llseek,
|
||||
.read = v9fs_cached_file_read,
|
||||
.write = v9fs_cached_file_write,
|
||||
.read_iter = generic_file_read_iter,
|
||||
.write_iter = generic_file_write_iter,
|
||||
.open = v9fs_file_open,
|
||||
.release = v9fs_dir_release,
|
||||
.lock = v9fs_file_lock,
|
||||
.mmap = v9fs_file_mmap,
|
||||
.fsync = v9fs_file_fsync,
|
||||
};
|
||||
|
||||
const struct file_operations v9fs_cached_file_operations_dotl = {
|
||||
.llseek = generic_file_llseek,
|
||||
.read = v9fs_cached_file_read,
|
||||
.write = v9fs_cached_file_write,
|
||||
.read_iter = generic_file_read_iter,
|
||||
.write_iter = generic_file_write_iter,
|
||||
.open = v9fs_file_open,
|
||||
.release = v9fs_dir_release,
|
||||
.lock = v9fs_file_lock_dotl,
|
||||
.flock = v9fs_file_flock_dotl,
|
||||
.mmap = v9fs_file_mmap,
|
||||
.fsync = v9fs_file_fsync_dotl,
|
||||
};
|
||||
|
||||
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_readonly_mmap,
|
||||
.fsync = v9fs_file_fsync,
|
||||
};
|
||||
|
||||
const struct file_operations v9fs_file_operations_dotl = {
|
||||
.llseek = generic_file_llseek,
|
||||
.read = v9fs_file_read,
|
||||
.write = v9fs_file_write,
|
||||
.open = v9fs_file_open,
|
||||
.release = v9fs_dir_release,
|
||||
.lock = v9fs_file_lock_dotl,
|
||||
.flock = v9fs_file_flock_dotl,
|
||||
.mmap = generic_file_readonly_mmap,
|
||||
.fsync = v9fs_file_fsync_dotl,
|
||||
};
|
||||
|
||||
const struct file_operations v9fs_mmap_file_operations = {
|
||||
.llseek = generic_file_llseek,
|
||||
.read = v9fs_mmap_file_read,
|
||||
.write = v9fs_mmap_file_write,
|
||||
.open = v9fs_file_open,
|
||||
.release = v9fs_dir_release,
|
||||
.lock = v9fs_file_lock,
|
||||
.mmap = v9fs_mmap_file_mmap,
|
||||
.fsync = v9fs_file_fsync,
|
||||
};
|
||||
|
||||
const struct file_operations v9fs_mmap_file_operations_dotl = {
|
||||
.llseek = generic_file_llseek,
|
||||
.read = v9fs_mmap_file_read,
|
||||
.write = v9fs_mmap_file_write,
|
||||
.open = v9fs_file_open,
|
||||
.release = v9fs_dir_release,
|
||||
.lock = v9fs_file_lock_dotl,
|
||||
.flock = v9fs_file_flock_dotl,
|
||||
.mmap = v9fs_mmap_file_mmap,
|
||||
.fsync = v9fs_file_fsync_dotl,
|
||||
};
|
||||
Loading…
Add table
Add a link
Reference in a new issue