/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would 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 the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_trans.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_alloc.h"
#include "xfs_btree.h"
#include "xfs_attr_sf.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_error.h"
#include "xfs_rw.h"
#include "xfs_ioctl32.h"
#include <linux/dcache.h>
#include <linux/smp_lock.h>
static struct vm_operations_struct linvfs_file_vm_ops;
#ifdef CONFIG_XFS_DMAPI
static struct vm_operations_struct linvfs_dmapi_file_vm_ops;
#endif
STATIC inline ssize_t
__linvfs_read(
struct kiocb *iocb,
char __user *buf,
int ioflags,
size_t count,
loff_t pos)
{
struct iovec iov = {buf, count};
struct file *file = iocb->ki_filp;
vnode_t *vp = LINVFS_GET_VP(file->f_dentry->d_inode);
ssize_t rval;
BUG_ON(iocb->ki_pos != pos);
if (unlikely(file->f_flags & O_DIRECT))
ioflags |= IO_ISDIRECT;
VOP_READ(vp, iocb, &iov, 1, &iocb->ki_pos, ioflags, NULL, rval);
return rval;
}
STATIC ssize_t
linvfs_aio_read(
struct kiocb *iocb,
char __user *buf,
size_t count,
loff_t pos)
{
return __linvfs_read(iocb, buf, IO_ISAIO, count, pos);
}
STATIC ssize_t
linvfs_aio_read_invis(
struct kiocb *iocb,
char __user *buf,
size_t count,
loff_t pos)
{
return __linvfs_read(iocb, buf, IO_ISAIO|IO_INVIS, count, pos);
}
STATIC inline ssize_t
__linvfs_write(
struct kiocb *iocb,
const char __user *buf,
int ioflags,
size_t count,
loff_t pos)
{
struct iovec iov = {(void __user *)buf, count};
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
vnode_t *vp = LINVFS_GET_VP(inode);
ssize_t rval;
BUG_ON(iocb->ki_pos != pos);
if (unlikely(file->f_flags & O_DIRECT))
ioflags |= IO_ISDIRECT;
VOP_WRITE(vp, iocb, &iov, 1, &iocb->ki_pos, ioflags, NULL, rval);
return rval;
}
STATIC ssize_t
linvfs_aio_write(
struct kiocb *iocb,
const char __user *buf,
size_t count,
loff_t pos)
{
return __linvfs_write(iocb, buf, IO_ISAIO, count, pos);
}
STATIC ssize_t
linvfs_aio_write_invis(
struct kiocb *iocb,
const char __user *buf,
size_t count,
loff_t pos)
{
return __linvfs_write(iocb, buf, IO_ISAIO|IO_INVIS, count, pos);
}
STATIC inline ssize_t
__linvfs_readv(
struct file *file,
const struct iovec *iov,
int ioflags,
unsigned long nr_segs,
loff_t *ppos)
{
struct inode *inode = file->f_mapping->host;
vnode_t *vp = LINVFS_GET_VP(inode);
struct kiocb *kiocb;
ssize_t rval;
kiocb = kmalloc(sizeof(*kiocb), GFP_KERNEL);
if (unlikely(!kiocb))
return -ENOMEM;
init_sync_kiocb(kiocb, file);
kiocb->ki_pos = *ppos;
if (unlikely(file->f_flags & O_DIRECT))
ioflags |= IO_ISDIRECT;
VOP_READ(vp, kiocb, iov, nr_segs, &kiocb->ki_pos, ioflags, NULL, rval);
*ppos = kiocb->ki_pos;
kfree(kiocb);
return rval;
}
STATIC ssize_t
linvfs_readv(
struct file *file,
const struct iovec *iov,
unsigned long nr_segs,
loff_t *ppos)
{
return __linvfs_readv(file, iov, 0, nr_segs, ppos);
}
STATIC ssize_t
linvfs_readv_invis(
struct file *file,
const struct iovec *iov,
unsigned long nr_segs,
loff_t *ppos)
{
return __linvfs_readv(file, iov, IO_INVIS, nr_segs, ppos);
}
STATIC inline ssize_t
__linvfs_writev(
struct file *file,
const struct iovec *iov,
int ioflags,
unsigned long nr_segs,
loff_t *ppos)
{
struct inode *inode = file->f_mapping->host;
vnode_t *vp = LINVFS_GET_VP(inode);
struct kiocb *kiocb;
ssize_t rval;
kiocb = kmalloc(sizeof(*kiocb), GFP_KERNEL);
if (unlikely(!kiocb))
return -ENOMEM;
init_sync_kiocb(kiocb, file);
kiocb->ki_pos = *ppos;
if (unlikely(file->f_flags & O_DIRECT))
ioflags |= IO_ISDIRECT;
VOP_WRITE(vp, kiocb, iov, nr_segs, &kiocb->ki_pos, ioflags, NULL, rval);
*ppos = kiocb->ki_pos;
kfree(kiocb);
return rval;
}
STATIC ssize_t
linvfs_writev(
struct file *file,
const struct iovec *iov,
unsigned long nr_segs,
loff_t *ppos)
{
return __linvfs_writev(file, iov, 0, nr_segs, ppos);
}
STATIC ssize_t
linvfs_writev_invis(
struct file *file,
const struct iovec *iov,
unsigned long nr_segs,
loff_t *ppos)
{
return __linvfs_writev(file, iov, IO_INVIS, nr_segs, ppos);
}
STATIC ssize_t
linvfs_sendfile(
struct file *filp,
loff_t *ppos,
size_t count,
read_actor_t actor,
void *target)
{
vnode_t *vp = LINVFS_GET_VP(filp->f_dentry->d_inode);
ssize_t rval;
VOP_SENDFILE(vp, filp, ppos, 0, count, actor, target, NULL, rval);
return rval;
}
STATIC int
linvfs_open(
struct inode *inode,
struct file *filp)
{
vnode_t *vp = LINVFS_GET_VP(inode);
int error;
if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
return -EFBIG;
ASSERT(vp);
VOP_OPEN(vp, NULL, error);
return -error;
}
STATIC int
linvfs_release(
struct inode *inode,
struct file *filp)
{
vnode_t *vp = LINVFS_GET_VP(inode);
int error = 0;
if (vp)
VOP_RELEASE(vp, error);
return -error;
}
STATIC int
linvfs_fsync(
struct file *filp,
struct dentry *dentry,
int datasync)
{
struct inode *inode = dentry->d_inode;
vnode_t *vp = LINVFS_GET_VP(inode);
int error;
int flags = FSYNC_WAIT;
if (datasync)
flags |= FSYNC_DATA;
ASSERT(vp);
VOP_FSYNC(vp, flags, NULL, (xfs_off_t)0, (xfs_off_t)-1, error);
return -error;
}
/*
* linvfs_readdir maps to VOP_READDIR().
* We need to build a uio, cred, ...
*/
#define nextdp(dp) ((struct xfs_dirent *)((char *)(dp) + (dp)->d_reclen))
#ifdef CONFIG_XFS_DMAPI
STATIC struct page *
linvfs_filemap_nopage(
struct vm_area_struct *area,
unsigned long address,
int *type)
{
struct inode *inode = area->vm_file->f_dentry->d_inode;
vnode_t *vp = LINVFS_GET_VP(inode);
xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp);
int error;
ASSERT_ALWAYS(vp->v_vfsp->vfs_flag & VFS_DMI);
error = XFS_SEND_MMAP(mp, area, 0);
if (error)
return NULL;
return filemap_nopage(area, address, type);
}
#endif /* CONFIG_XFS_DMAPI */
STATIC int
linvfs_readdir(
struct file *filp,
void *dirent,
filldir_t filldir)
{
int error = 0;
vnode_t *vp;
uio_t uio;
iovec_t iov;
int eof = 0;
caddr_t read_buf;
int namelen, size = 0;
size_t rlen = PAGE_CACHE_SIZE;
xfs_off_t start_offset, curr_offset;
xfs_dirent_t *dbp = NULL;
vp = LINVFS_GET_VP(filp->f_dentry->d_inode);
ASSERT(vp);
/* Try fairly hard to get memory */
do {
if ((read_buf = (caddr_t)kmalloc(rlen, GFP_KERNEL)))
break;
rlen >>= 1;
} while (rlen >= 1024);
if (read_buf == NULL)
return -ENOMEM;
uio.uio_iov = &iov;
uio.uio_segflg = UIO_SYSSPACE;
curr_offset = filp->f_pos;
if (filp->f_pos != 0x7fffffff)
uio.uio_offset = filp->f_pos;
else
uio.uio_offset = 0xffffffff;
while (!eof) {
uio.uio_resid = iov.iov_len = rlen;
iov.iov_base = read_buf;
uio.uio_iovcnt = 1;
start_offset = uio.uio_offset;
VOP_READDIR(vp, &uio, NULL, &eof, error);
if ((uio.uio_offset == start_offset) || error) {
size = 0;
break;
}
size = rlen - uio.uio_resid;
dbp = (xfs_dirent_t *)read_buf;
while (size > 0) {
namelen = strlen(dbp->d_name);
if (filldir(dirent, dbp->d_name, namelen,
(loff_t) curr_offset & 0x7fffffff,
(ino_t) dbp->d_ino,
DT_UNKNOWN)) {
goto done;
}
size -= dbp->d_reclen;
curr_offset = (loff_t)dbp->d_off /* & 0x7fffffff */;
dbp = nextdp(dbp);
}
}
done:
if (!error) {
if (size == 0)
filp->f_pos = uio.uio_offset & 0x7fffffff;
else if (dbp)
filp->f_pos = curr_offset;
}
kfree(read_buf);
return -error;
}
STATIC int
linvfs_file_mmap(
struct file *filp,
struct vm_area_struct *vma)
{
struct inode *ip = filp->f_dentry->d_inode;
vnode_t *vp = LINVFS_GET_VP(ip);
vattr_t *vattr;
int error;
vma->vm_ops = &linvfs_file_vm_ops;
#ifdef CONFIG_XFS_DMAPI
if (vp->v_vfsp->vfs_flag & VFS_DMI) {
vma->vm_ops = &linvfs_dmapi_file_vm_ops;
}
#endif /* CONFIG_XFS_DMAPI */
vattr = kmalloc(sizeof(*vattr), GFP_KERNEL);
if (unlikely(!vattr))
return -ENOMEM;
vattr->va_mask = XFS_AT_UPDATIME;
VOP_SETATTR(vp, vattr, XFS_AT_UPDATIME, NULL, error);
if (likely(!error))
__vn_revalidate(vp, vattr); /* update flags */
kfree(vattr);
return 0;
}
STATIC long
linvfs_ioctl(
struct file *filp,
unsigned int cmd,
unsigned long arg)
{
int error;
struct inode *inode = filp->f_dentry->d_inode;
vnode_t *vp = LINVFS_GET_VP(inode);
VOP_IOCTL(vp, inode, filp, 0, cmd, (void __user *)arg, error);
VMODIFY(vp);
/* NOTE: some of the ioctl's return positive #'s as a
* byte count indicating success, such as
* readlink_by_handle. So we don't "sign flip"
* like most other routines. This means true
* errors need to be returned as a negative value.
*/
return error;
}
STATIC long
linvfs_ioctl_invis(
struct file *filp,
unsigned int cmd,
unsigned long arg)
{
int error;
struct inode *inode = filp->f_dentry->d_inode;
vnode_t *vp = LINVFS_GET_VP(inode);
ASSERT(vp);
VOP_IOCTL(vp, inode, filp, IO_INVIS, cmd, (void __user *)arg, error);
VMODIFY(vp);
/* NOTE: some of the ioctl's return positive #'s as a
* byte count indicating success, such as
* readlink_by_handle. So we don't "sign flip"
* like most other routines. This means true
* errors need to be returned as a negative value.
*/
return error;
}
#ifdef CONFIG_XFS_DMAPI
#ifdef HAVE_VMOP_MPROTECT
STATIC int
linvfs_mprotect(
struct vm_area_struct *vma,
unsigned int newflags)
{
vnode_t *vp = LINVFS_GET_VP(vma->vm_file->f_dentry->d_inode);
int error = 0;
if (vp->v_vfsp->vfs_flag & VFS_DMI) {
if ((vma->vm_flags & VM_MAYSHARE) &&
(newflags & VM_WRITE) && !(vma->vm_flags & VM_WRITE)) {
xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp);
error = XFS_SEND_MMAP(mp, vma, VM_WRITE);
}
}
return error;
}
#endif /* HAVE_VMOP_MPROTECT */
#endif /* CONFIG_XFS_DMAPI */
#ifdef HAVE_FOP_OPEN_EXEC
/* If the user is attempting to execute a file that is offline then
* we have to trigger a DMAPI READ event before the file is marked as busy
* otherwise the invisible I/O will not be able to write to the file to bring
* it back online.
*/
STATIC int
linvfs_open_exec(
struct inode *inode)
{
vnode_t *vp = LINVFS_GET_VP(inode);
xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp);
int error = 0;
xfs_inode_t *ip;
if (vp->v_vfsp->vfs_flag & VFS_DMI) {
ip = xfs_vtoi(vp);
if (!ip) {
error = -EINVAL;
goto open_exec_out;
}
if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ)) {
error = -XFS_SEND_DATA(mp, DM_EVENT_READ, vp,
0, 0, 0, NULL);
}
}
open_exec_out:
return error;
}
#endif /* HAVE_FOP_OPEN_EXEC */
struct file_operations linvfs_file_operations = {
.llseek = generic_file_llseek,
.read = do_sync_read,
.write = do_sync_write,
.readv = linvfs_readv,
.writev = linvfs_writev,
.aio_read = linvfs_aio_read,
.aio_write = linvfs_aio_write,
.sendfile = linvfs_sendfile,
.unlocked_ioctl = linvfs_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = linvfs_compat_ioctl,
#endif
.mmap = linvfs_file_mmap,
.open = linvfs_open,
.release = linvfs_release,
.fsync = linvfs_fsync,
#ifdef HAVE_FOP_OPEN_EXEC
.open_exec = linvfs_open_exec,
#endif
};
struct file_operations linvfs_invis_file_operations = {
.llseek = generic_file_llseek,
.read = do_sync_read,
.write = do_sync_write,
.readv = linvfs_readv_invis,
.writev = linvfs_writev_invis,
.aio_read = linvfs_aio_read_invis,
.aio_write = linvfs_aio_write_invis,
.sendfile = linvfs_sendfile,
.unlocked_ioctl = linvfs_ioctl_invis,
#ifdef CONFIG_COMPAT
.compat_ioctl = linvfs_compat_invis_ioctl,
#endif
.mmap = linvfs_file_mmap,
.open = linvfs_open,
.release = linvfs_release,
.fsync = linvfs_fsync,
};
struct file_operations linvfs_dir_operations = {
.read = generic_read_dir,
.readdir = linvfs_readdir,
.unlocked_ioctl = linvfs_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = linvfs_compat_ioctl,
#endif
.fsync = linvfs_fsync,
};
static struct vm_operations_struct linvfs_file_vm_ops = {
.nopage = filemap_nopage,
.populate = filemap_populate,
};
#ifdef CONFIG_XFS_DMAPI
static struct vm_operations_struct linvfs_dmapi_file_vm_ops = {
.nopage = linvfs_filemap_nopage,
.populate = filemap_populate,
#ifdef HAVE_VMOP_MPROTECT
.mprotect = linvfs_mprotect,
#endif
};
#endif /* CONFIG_XFS_DMAPI */
