mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 03:10:12 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
-----BEGIN PGP SIGNATURE----- iQIcBAABAgAGBQJZrTy3AAoJEAAOaEEZVoIVaucP/ApBAj2S5wzvlV1u6l8E6ae7 ZeEEZfcWwzRYlKjZAkTWqj9XvGpDGO5gLq4wsZK2edFAq++/MJF8ZVtN4tdZ1kUZ DUvRodtVOrT08Kp9wZXGT7JOFrf6U/6gMcR6p0MuWnHndeKYvlpcFi9NPT4EC9/z Zm9V7gtlPdSOha7eaSjUS0+vLERkxqXLBW3Av9QUOBP/lbI3lqIroGKeHDYnVdya 2P/k5EcRRJMyJP6TqyYxmmJl+UWjJFMLvnlUDBslHnD/u3mIUhw3JLHYBjn5dZRE Xjq56IDPoXDUvzlBhtn/Uqyx+/wtwsNsylpmKv6K5G1JfdeuSsPVsCey+A1cqV64 LpE5896wf9TmnmI9LNyh6vDn925xPSGBiF45UEp5f9aO7jXeY0MaEZ8g+ENqFIDK v4gtZdS9FhYHV+/l4qEwYMKrqSbwKEs1r1FT+f4wnABby1ojfdA57ZPlp5PV2Vjp szTp88Zkb7cMvZwEnWwxWofcJNmgS7uNahvnQF3IJ4ITsioEkuyYR3K4ZQMaaaV9 wCp6G0FhXZaK3OI7o9WiDwaO2elp9Hxc8bnqKpiBbHZkY0NLh7/++5VxpeNbTHFy AGijQiiKGNNyYqNj93wq9jpVdMNjB0pXrHRxfav8v7MtQ+WfbEoAENF4T7hN7iXn UuF6eSWEC5O1UCRUk1A+ =LLY3 -----END PGP SIGNATURE----- Merge tag 'wberr-v4.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux Pull writeback error handling updates from Jeff Layton: "This pile continues the work from last cycle on better tracking writeback errors. In v4.13 we added some basic errseq_t infrastructure and converted a few filesystems to use it. This set continues refining that infrastructure, adds documentation, and converts most of the other filesystems to use it. The main exception at this point is the NFS client" * tag 'wberr-v4.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux: ecryptfs: convert to file_write_and_wait in ->fsync mm: remove optimizations based on i_size in mapping writeback waits fs: convert a pile of fsync routines to errseq_t based reporting gfs2: convert to errseq_t based writeback error reporting for fsync fs: convert sync_file_range to use errseq_t based error-tracking mm: add file_fdatawait_range and file_write_and_wait fuse: convert to errseq_t based error tracking for fsync mm: consolidate dax / non-dax checks for writeback Documentation: add some docs for errseq_t errseq: rename __errseq_set to errseq_set
706 lines
17 KiB
C
706 lines
17 KiB
C
/*
|
|
* 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 <linux/pagemap.h>
|
|
#include <linux/utsname.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/idr.h>
|
|
#include <linux/uio.h>
|
|
#include <linux/slab.h>
|
|
#include <net/9p/9p.h>
|
|
#include <net/9p/client.h>
|
|
|
|
#include "v9fs.h"
|
|
#include "v9fs_vfs.h"
|
|
#include "fid.h"
|
|
#include "cache.h"
|
|
|
|
static const struct vm_operations_struct v9fs_file_vm_ops;
|
|
static const struct vm_operations_struct v9fs_mmap_file_vm_ops;
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int err;
|
|
struct v9fs_inode *v9inode;
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *fid;
|
|
int omode;
|
|
|
|
p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
|
|
v9inode = V9FS_I(inode);
|
|
v9ses = v9fs_inode2v9ses(inode);
|
|
if (v9fs_proto_dotl(v9ses))
|
|
omode = v9fs_open_to_dotl_flags(file->f_flags);
|
|
else
|
|
omode = v9fs_uflags2omode(file->f_flags,
|
|
v9fs_proto_dotu(v9ses));
|
|
fid = file->private_data;
|
|
if (!fid) {
|
|
fid = v9fs_fid_clone(file_dentry(file));
|
|
if (IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
err = p9_client_open(fid, omode);
|
|
if (err < 0) {
|
|
p9_client_clunk(fid);
|
|
return err;
|
|
}
|
|
if ((file->f_flags & O_APPEND) &&
|
|
(!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
|
|
generic_file_llseek(file, 0, SEEK_END);
|
|
}
|
|
|
|
file->private_data = fid;
|
|
mutex_lock(&v9inode->v_mutex);
|
|
if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
|
|
!v9inode->writeback_fid &&
|
|
((file->f_flags & O_ACCMODE) != O_RDONLY)) {
|
|
/*
|
|
* clone a fid and add it to writeback_fid
|
|
* we do it during open time instead of
|
|
* page dirty time via write_begin/page_mkwrite
|
|
* because we want write after unlink usecase
|
|
* to work.
|
|
*/
|
|
fid = v9fs_writeback_fid(file_dentry(file));
|
|
if (IS_ERR(fid)) {
|
|
err = PTR_ERR(fid);
|
|
mutex_unlock(&v9inode->v_mutex);
|
|
goto out_error;
|
|
}
|
|
v9inode->writeback_fid = (void *) fid;
|
|
}
|
|
mutex_unlock(&v9inode->v_mutex);
|
|
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
|
|
v9fs_cache_inode_set_cookie(inode, file);
|
|
return 0;
|
|
out_error:
|
|
p9_client_clunk(file->private_data);
|
|
file->private_data = NULL;
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* v9fs_file_lock - lock a file (or directory)
|
|
* @filp: file to be locked
|
|
* @cmd: lock command
|
|
* @fl: file lock structure
|
|
*
|
|
* Bugs: 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 = file_inode(filp);
|
|
|
|
p9_debug(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl);
|
|
|
|
/* No mandatory locks */
|
|
if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
|
|
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;
|
|
}
|
|
|
|
static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
|
|
{
|
|
struct p9_flock flock;
|
|
struct p9_fid *fid;
|
|
uint8_t status = P9_LOCK_ERROR;
|
|
int res = 0;
|
|
unsigned char fl_type;
|
|
|
|
fid = filp->private_data;
|
|
BUG_ON(fid == NULL);
|
|
|
|
if ((fl->fl_flags & FL_POSIX) != FL_POSIX)
|
|
BUG();
|
|
|
|
res = locks_lock_file_wait(filp, fl);
|
|
if (res < 0)
|
|
goto out;
|
|
|
|
/* convert posix lock to p9 tlock args */
|
|
memset(&flock, 0, sizeof(flock));
|
|
/* map the lock type */
|
|
switch (fl->fl_type) {
|
|
case F_RDLCK:
|
|
flock.type = P9_LOCK_TYPE_RDLCK;
|
|
break;
|
|
case F_WRLCK:
|
|
flock.type = P9_LOCK_TYPE_WRLCK;
|
|
break;
|
|
case F_UNLCK:
|
|
flock.type = P9_LOCK_TYPE_UNLCK;
|
|
break;
|
|
}
|
|
flock.start = fl->fl_start;
|
|
if (fl->fl_end == OFFSET_MAX)
|
|
flock.length = 0;
|
|
else
|
|
flock.length = fl->fl_end - fl->fl_start + 1;
|
|
flock.proc_id = fl->fl_pid;
|
|
flock.client_id = fid->clnt->name;
|
|
if (IS_SETLKW(cmd))
|
|
flock.flags = P9_LOCK_FLAGS_BLOCK;
|
|
|
|
/*
|
|
* if its a blocked request and we get P9_LOCK_BLOCKED as the status
|
|
* for lock request, keep on trying
|
|
*/
|
|
for (;;) {
|
|
res = p9_client_lock_dotl(fid, &flock, &status);
|
|
if (res < 0)
|
|
goto out_unlock;
|
|
|
|
if (status != P9_LOCK_BLOCKED)
|
|
break;
|
|
if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd))
|
|
break;
|
|
if (schedule_timeout_interruptible(P9_LOCK_TIMEOUT) != 0)
|
|
break;
|
|
}
|
|
|
|
/* map 9p status to VFS status */
|
|
switch (status) {
|
|
case P9_LOCK_SUCCESS:
|
|
res = 0;
|
|
break;
|
|
case P9_LOCK_BLOCKED:
|
|
res = -EAGAIN;
|
|
break;
|
|
default:
|
|
WARN_ONCE(1, "unknown lock status code: %d\n", status);
|
|
/* fallthough */
|
|
case P9_LOCK_ERROR:
|
|
case P9_LOCK_GRACE:
|
|
res = -ENOLCK;
|
|
break;
|
|
}
|
|
|
|
out_unlock:
|
|
/*
|
|
* incase server returned error for lock request, revert
|
|
* it locally
|
|
*/
|
|
if (res < 0 && fl->fl_type != F_UNLCK) {
|
|
fl_type = fl->fl_type;
|
|
fl->fl_type = F_UNLCK;
|
|
/* Even if this fails we want to return the remote error */
|
|
locks_lock_file_wait(filp, fl);
|
|
fl->fl_type = fl_type;
|
|
}
|
|
out:
|
|
return res;
|
|
}
|
|
|
|
static int v9fs_file_getlock(struct file *filp, struct file_lock *fl)
|
|
{
|
|
struct p9_getlock glock;
|
|
struct p9_fid *fid;
|
|
int res = 0;
|
|
|
|
fid = filp->private_data;
|
|
BUG_ON(fid == NULL);
|
|
|
|
posix_test_lock(filp, fl);
|
|
/*
|
|
* if we have a conflicting lock locally, no need to validate
|
|
* with server
|
|
*/
|
|
if (fl->fl_type != F_UNLCK)
|
|
return res;
|
|
|
|
/* convert posix lock to p9 tgetlock args */
|
|
memset(&glock, 0, sizeof(glock));
|
|
glock.type = P9_LOCK_TYPE_UNLCK;
|
|
glock.start = fl->fl_start;
|
|
if (fl->fl_end == OFFSET_MAX)
|
|
glock.length = 0;
|
|
else
|
|
glock.length = fl->fl_end - fl->fl_start + 1;
|
|
glock.proc_id = fl->fl_pid;
|
|
glock.client_id = fid->clnt->name;
|
|
|
|
res = p9_client_getlock_dotl(fid, &glock);
|
|
if (res < 0)
|
|
return res;
|
|
/* map 9p lock type to os lock type */
|
|
switch (glock.type) {
|
|
case P9_LOCK_TYPE_RDLCK:
|
|
fl->fl_type = F_RDLCK;
|
|
break;
|
|
case P9_LOCK_TYPE_WRLCK:
|
|
fl->fl_type = F_WRLCK;
|
|
break;
|
|
case P9_LOCK_TYPE_UNLCK:
|
|
fl->fl_type = F_UNLCK;
|
|
break;
|
|
}
|
|
if (glock.type != P9_LOCK_TYPE_UNLCK) {
|
|
fl->fl_start = glock.start;
|
|
if (glock.length == 0)
|
|
fl->fl_end = OFFSET_MAX;
|
|
else
|
|
fl->fl_end = glock.start + glock.length - 1;
|
|
fl->fl_pid = -glock.proc_id;
|
|
}
|
|
kfree(glock.client_id);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* v9fs_file_lock_dotl - lock a file (or directory)
|
|
* @filp: file to be locked
|
|
* @cmd: lock command
|
|
* @fl: file lock structure
|
|
*
|
|
*/
|
|
|
|
static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl)
|
|
{
|
|
struct inode *inode = file_inode(filp);
|
|
int ret = -ENOLCK;
|
|
|
|
p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
|
|
filp, cmd, fl, filp);
|
|
|
|
/* No mandatory locks */
|
|
if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
|
|
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);
|
|
}
|
|
|
|
if (IS_SETLK(cmd) || IS_SETLKW(cmd))
|
|
ret = v9fs_file_do_lock(filp, cmd, fl);
|
|
else if (IS_GETLK(cmd))
|
|
ret = v9fs_file_getlock(filp, fl);
|
|
else
|
|
ret = -EINVAL;
|
|
out_err:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* v9fs_file_flock_dotl - lock a file
|
|
* @filp: file to be locked
|
|
* @cmd: lock command
|
|
* @fl: file lock structure
|
|
*
|
|
*/
|
|
|
|
static int v9fs_file_flock_dotl(struct file *filp, int cmd,
|
|
struct file_lock *fl)
|
|
{
|
|
struct inode *inode = file_inode(filp);
|
|
int ret = -ENOLCK;
|
|
|
|
p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n",
|
|
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_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_iter(struct kiocb *iocb, struct iov_iter *to)
|
|
{
|
|
struct p9_fid *fid = iocb->ki_filp->private_data;
|
|
int ret, err = 0;
|
|
|
|
p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n",
|
|
iov_iter_count(to), iocb->ki_pos);
|
|
|
|
ret = p9_client_read(fid, iocb->ki_pos, to, &err);
|
|
if (!ret)
|
|
return err;
|
|
|
|
iocb->ki_pos += ret;
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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_iter(struct kiocb *iocb, struct iov_iter *from)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
ssize_t retval;
|
|
loff_t origin;
|
|
int err = 0;
|
|
|
|
retval = generic_write_checks(iocb, from);
|
|
if (retval <= 0)
|
|
return retval;
|
|
|
|
origin = iocb->ki_pos;
|
|
retval = p9_client_write(file->private_data, iocb->ki_pos, from, &err);
|
|
if (retval > 0) {
|
|
struct inode *inode = file_inode(file);
|
|
loff_t i_size;
|
|
unsigned long pg_start, pg_end;
|
|
pg_start = origin >> PAGE_SHIFT;
|
|
pg_end = (origin + retval - 1) >> PAGE_SHIFT;
|
|
if (inode->i_mapping && inode->i_mapping->nrpages)
|
|
invalidate_inode_pages2_range(inode->i_mapping,
|
|
pg_start, pg_end);
|
|
iocb->ki_pos += retval;
|
|
i_size = i_size_read(inode);
|
|
if (iocb->ki_pos > i_size) {
|
|
inode_add_bytes(inode, iocb->ki_pos - i_size);
|
|
i_size_write(inode, iocb->ki_pos);
|
|
}
|
|
return retval;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
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 = file_write_and_wait_range(filp, start, end);
|
|
if (retval)
|
|
return retval;
|
|
|
|
inode_lock(inode);
|
|
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);
|
|
inode_unlock(inode);
|
|
|
|
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 = file_write_and_wait_range(filp, start, end);
|
|
if (retval)
|
|
return retval;
|
|
|
|
inode_lock(inode);
|
|
p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync);
|
|
|
|
fid = filp->private_data;
|
|
|
|
retval = p9_client_fsync(fid, datasync);
|
|
inode_unlock(inode);
|
|
|
|
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(file_dentry(filp));
|
|
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_fault *vmf)
|
|
{
|
|
struct v9fs_inode *v9inode;
|
|
struct page *page = vmf->page;
|
|
struct file *filp = vmf->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;
|
|
}
|
|
|
|
/**
|
|
* 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_iter(struct kiocb *iocb, struct iov_iter *to)
|
|
{
|
|
/* TODO: Check if there are dirty pages */
|
|
return v9fs_file_read_iter(iocb, to);
|
|
}
|
|
|
|
/**
|
|
* 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_iter(struct kiocb *iocb, struct iov_iter *from)
|
|
{
|
|
/*
|
|
* TODO: invalidate mmaps on filp's inode between
|
|
* offset and offset+count
|
|
*/
|
|
return v9fs_file_write_iter(iocb, from);
|
|
}
|
|
|
|
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,
|
|
};
|
|
|
|
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,
|
|
};
|
|
|
|
|
|
const struct file_operations v9fs_cached_file_operations = {
|
|
.llseek = generic_file_llseek,
|
|
.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_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_iter = v9fs_file_read_iter,
|
|
.write_iter = v9fs_file_write_iter,
|
|
.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_iter = v9fs_file_read_iter,
|
|
.write_iter = v9fs_file_write_iter,
|
|
.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_iter = v9fs_mmap_file_read_iter,
|
|
.write_iter = v9fs_mmap_file_write_iter,
|
|
.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_iter = v9fs_mmap_file_read_iter,
|
|
.write_iter = v9fs_mmap_file_write_iter,
|
|
.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,
|
|
};
|