/**
* Rename a regular file / directory.
*
* @param old_parent inode of the old parent directory
* @param old_dentry old directory cache entry
* @param new_parent inode of the new parent directory
* @param new_dentry new directory cache entry
* @returns 0 on success, Linux error code otherwise
*/
static int sf_rename(struct inode *old_parent, struct dentry *old_dentry,
struct inode *new_parent, struct dentry *new_dentry)
{
int err = 0, rc = VINF_SUCCESS;
struct sf_glob_info *sf_g = GET_GLOB_INFO(old_parent->i_sb);
TRACE();
if (sf_g != GET_GLOB_INFO(new_parent->i_sb))
{
LogFunc(("rename with different roots\n"));
err = -EINVAL;
}
else
{
struct sf_inode_info *sf_old_i = GET_INODE_INFO(old_parent);
struct sf_inode_info *sf_new_i = GET_INODE_INFO(new_parent);
/* As we save the relative path inside the inode structure, we need to change
this if the rename is successful. */
struct sf_inode_info *sf_file_i = GET_INODE_INFO(old_dentry->d_inode);
SHFLSTRING *old_path;
SHFLSTRING *new_path;
BUG_ON(!sf_old_i);
BUG_ON(!sf_new_i);
BUG_ON(!sf_file_i);
old_path = sf_file_i->path;
err = sf_path_from_dentry(__func__, sf_g, sf_new_i,
new_dentry, &new_path);
if (err)
LogFunc(("failed to create new path\n"));
else
{
int fDir = ((old_dentry->d_inode->i_mode & S_IFDIR) != 0);
rc = vboxCallRename(&client_handle, &sf_g->map, old_path,
new_path, fDir ? 0 : SHFL_RENAME_FILE | SHFL_RENAME_REPLACE_IF_EXISTS);
if (RT_SUCCESS(rc))
{
kfree(old_path);
sf_new_i->force_restat = 1;
sf_old_i->force_restat = 1; /* XXX: needed? */
/* Set the new relative path in the inode. */
sf_file_i->path = new_path;
}
else
{
LogFunc(("vboxCallRename failed rc=%Rrc\n", rc));
err = -RTErrConvertToErrno(rc);
kfree(new_path);
}
}
}
return err;
}
static void *sf_follow_link(struct dentry *dentry, struct nameidata *nd)
# endif
{
struct inode *inode = dentry->d_inode;
struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
int error = -ENOMEM;
char *path = (char*)get_zeroed_page(GFP_KERNEL);
int rc;
if (path)
{
error = 0;
rc = vboxReadLink(&client_handle, &sf_g->map, sf_i->path, PATH_MAX, path);
if (RT_FAILURE(rc))
{
LogFunc(("vboxReadLink failed, caller=%s, rc=%Rrc\n", __func__, rc));
free_page((unsigned long)path);
error = -EPROTO;
}
}
# if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
return error ? ERR_PTR(error) : (*cookie = path);
# else
nd_set_link(nd, error ? ERR_PTR(error) : path);
return NULL;
# endif
}
/**
* Close a regular file.
*
* @param inode the inode
* @param file the file
* @returns 0 on success, Linux error code otherwise
*/
static int sf_reg_release(struct inode *inode, struct file *file)
{
int rc;
struct sf_reg_info *sf_r;
struct sf_glob_info *sf_g;
struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
TRACE();
sf_g = GET_GLOB_INFO(inode->i_sb);
sf_r = file->private_data;
BUG_ON(!sf_g);
BUG_ON(!sf_r);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 25)
/* See the smbfs source (file.c). mmap in particular can cause data to be
* written to the file after it is closed, which we can't cope with. We
* copy and paste the body of filemap_write_and_wait() here as it was not
* defined before 2.6.6 and not exported until quite a bit later. */
/* filemap_write_and_wait(inode->i_mapping); */
if ( inode->i_mapping->nrpages
&& filemap_fdatawrite(inode->i_mapping) != -EIO)
filemap_fdatawait(inode->i_mapping);
#endif
rc = vboxCallClose(&client_handle, &sf_g->map, sf_r->handle);
if (RT_FAILURE(rc))
LogFunc(("vboxCallClose failed rc=%Rrc\n", rc));
kfree(sf_r);
sf_i->file = NULL;
sf_i->handle = SHFL_HANDLE_NIL;
file->private_data = NULL;
return 0;
}
static void sf_clear_inode(struct inode *inode)
{
struct sf_inode_info *sf_i;
TRACE();
sf_i = GET_INODE_INFO(inode);
if (!sf_i)
return;
BUG_ON(!sf_i->path);
kfree(sf_i->path);
kfree(sf_i);
SET_INODE_INFO(inode, NULL);
}
static void sf_evict_inode(struct inode *inode)
{
struct sf_inode_info *sf_i;
TRACE();
truncate_inode_pages(&inode->i_data, 0);
end_writeback(inode);
sf_i = GET_INODE_INFO(inode);
if (!sf_i)
return;
BUG_ON(!sf_i->path);
kfree(sf_i->path);
kfree(sf_i);
SET_INODE_INFO(inode, NULL);
}
static int sf_remount_fs(struct super_block *sb, int *flags, char *data)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 23)
struct sf_glob_info *sf_g;
struct vbsf_mount_info_new *info;
struct sf_inode_info *sf_i;
struct inode *iroot;
SHFLFSOBJINFO fsinfo;
int err;
printk(KERN_DEBUG "ENTER: sf_remount_fs\n");
sf_g = GET_GLOB_INFO(sb);
BUG_ON(!sf_g);
BUG_ON(data[0] != 0);
info = (struct vbsf_mount_info_new *)data;
BUG_ON( info->signature[0] != VBSF_MOUNT_SIGNATURE_BYTE_0
|| info->signature[1] != VBSF_MOUNT_SIGNATURE_BYTE_1
|| info->signature[2] != VBSF_MOUNT_SIGNATURE_BYTE_2);
sf_g->uid = info->uid;
sf_g->gid = info->gid;
sf_g->ttl = info->ttl;
sf_g->dmode = info->dmode;
sf_g->fmode = info->fmode;
sf_g->dmask = info->dmask;
sf_g->fmask = info->fmask;
iroot = ilookup(sb, 0);
if (!iroot)
{
printk(KERN_DEBUG "can't find root inode\n");
return -ENOSYS;
}
sf_i = GET_INODE_INFO(iroot);
err = sf_stat(__func__, sf_g, sf_i->path, &fsinfo, 0);
BUG_ON(err != 0);
sf_init_inode(sf_g, iroot, &fsinfo);
/*unlock_new_inode(iroot);*/
printk(KERN_DEBUG "LEAVE: sf_remount_fs\n");
return 0;
#else
return -ENOSYS;
#endif
}
static int sf_remount_fs(struct super_block *sb, int *flags, char *data)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 23)
struct sf_glob_info *sf_g;
struct sf_inode_info *sf_i;
struct inode *iroot;
SHFLFSOBJINFO fsinfo;
int err;
sf_g = GET_GLOB_INFO(sb);
BUG_ON(!sf_g);
if (data && data[0] != 0)
{
struct vbsf_mount_info_new *info =
(struct vbsf_mount_info_new *)data;
if ( info->signature[0] == VBSF_MOUNT_SIGNATURE_BYTE_0
&& info->signature[1] == VBSF_MOUNT_SIGNATURE_BYTE_1
&& info->signature[2] == VBSF_MOUNT_SIGNATURE_BYTE_2)
{
sf_g->uid = info->uid;
sf_g->gid = info->gid;
sf_g->ttl = info->ttl;
sf_g->dmode = info->dmode;
sf_g->fmode = info->fmode;
sf_g->dmask = info->dmask;
sf_g->fmask = info->fmask;
}
}
iroot = ilookup(sb, 0);
if (!iroot)
return -ENOSYS;
sf_i = GET_INODE_INFO(iroot);
err = sf_stat(__func__, sf_g, sf_i->path, &fsinfo, 0);
BUG_ON(err != 0);
sf_init_inode(sf_g, iroot, &fsinfo);
/*unlock_new_inode(iroot);*/
return 0;
#else
return -ENOSYS;
#endif
}
/**
* Remove a regular file / directory.
*
* @param parent inode of the directory
* @param dentry directory cache entry
* @param fDirectory true if directory, false otherwise
* @returns 0 on success, Linux error code otherwise
*/
static int sf_unlink_aux(struct inode *parent, struct dentry *dentry, int fDirectory)
{
int rc, err;
struct sf_glob_info *sf_g = GET_GLOB_INFO(parent->i_sb);
struct sf_inode_info *sf_i = GET_INODE_INFO(parent);
SHFLSTRING *path;
uint32_t fFlags;
TRACE();
BUG_ON(!sf_g);
err = sf_path_from_dentry(__func__, sf_g, sf_i, dentry, &path);
if (err)
goto fail0;
fFlags = fDirectory ? SHFL_REMOVE_DIR : SHFL_REMOVE_FILE;
if ( dentry
&& dentry->d_inode
&& ((dentry->d_inode->i_mode & S_IFLNK) == S_IFLNK))
fFlags |= SHFL_REMOVE_SYMLINK;
rc = vboxCallRemove(&client_handle, &sf_g->map, path, fFlags);
if (RT_FAILURE(rc))
{
LogFunc(("(%d): vboxCallRemove(%s) failed rc=%Rrc\n", fDirectory,
path->String.utf8, rc));
err = -RTErrConvertToErrno(rc);
goto fail1;
}
/* directory access/change time changed */
sf_i->force_restat = 1;
/* directory content changed */
sf_i->force_reread = 1;
err = 0;
fail1:
kfree(path);
fail0:
return err;
}
static int
sf_writepage(struct page *page, struct writeback_control *wbc)
{
struct address_space *mapping = page->mapping;
struct inode *inode = mapping->host;
struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
struct file *file = sf_i->file;
struct sf_reg_info *sf_r = file->private_data;
char *buf;
uint32_t nwritten = PAGE_SIZE;
int end_index = inode->i_size >> PAGE_SHIFT;
loff_t off = ((loff_t) page->index) << PAGE_SHIFT;
int err;
TRACE();
if (page->index >= end_index)
nwritten = inode->i_size & (PAGE_SIZE-1);
buf = kmap(page);
err = sf_reg_write_aux(__func__, sf_g, sf_r, buf, &nwritten, off);
if (err < 0)
{
ClearPageUptodate(page);
goto out;
}
if (off > inode->i_size)
inode->i_size = off;
if (PageError(page))
ClearPageError(page);
err = 0;
out:
kunmap(page);
unlock_page(page);
return err;
}
/* this is called directly as iop on 2.4, indirectly as dop
[sf_dentry_revalidate] on 2.4/2.6, indirectly as iop through
[sf_getattr] on 2.6. the job is to find out whether dentry/inode is
still valid. the test is failed if [dentry] does not have an inode
or [sf_stat] is unsuccessful, otherwise we return success and
update inode attributes */
int sf_inode_revalidate(struct dentry *dentry)
{
int err;
struct sf_glob_info *sf_g;
struct sf_inode_info *sf_i;
SHFLFSOBJINFO info;
TRACE();
if (!dentry || !dentry->d_inode)
{
LogFunc(("no dentry(%p) or inode(%p)\n", dentry, dentry->d_inode));
return -EINVAL;
}
sf_g = GET_GLOB_INFO(dentry->d_inode->i_sb);
sf_i = GET_INODE_INFO(dentry->d_inode);
#if 0
printk("%s called by %p:%p\n",
sf_i->path->String.utf8,
__builtin_return_address (0),
__builtin_return_address (1));
#endif
BUG_ON(!sf_g);
BUG_ON(!sf_i);
if (!sf_i->force_restat)
{
if (jiffies - dentry->d_time < sf_g->ttl)
return 0;
}
err = sf_stat(__func__, sf_g, sf_i->path, &info, 1);
if (err)
return err;
dentry->d_time = jiffies;
sf_init_inode(sf_g, dentry->d_inode, &info);
return 0;
}
static void sf_evict_inode(struct inode *inode)
{
struct sf_inode_info *sf_i;
TRACE();
truncate_inode_pages(&inode->i_data, 0);
# if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
clear_inode(inode);
# else
end_writeback(inode);
# endif
sf_i = GET_INODE_INFO(inode);
if (!sf_i)
return;
BUG_ON(!sf_i->path);
kfree(sf_i->path);
kfree(sf_i);
SET_INODE_INFO(inode, NULL);
}
/*
* Copyright (C) 2010-2011 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
#include "vfsmod.h"
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
# if LINUX_VERSION_CODE < KERNEL_VERSION(4, 5, 0)
# if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
static const char *sf_follow_link(struct dentry *dentry, void **cookie)
# else
static void *sf_follow_link(struct dentry *dentry, struct nameidata *nd)
# endif
{
struct inode *inode = dentry->d_inode;
struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
int error = -ENOMEM;
char *path = (char*)get_zeroed_page(GFP_KERNEL);
int rc;
if (path)
{
error = 0;
rc = VbglR0SfReadLink(&client_handle, &sf_g->map, sf_i->path, PATH_MAX, path);
if (RT_FAILURE(rc))
{
LogFunc(("VbglR0SfReadLink failed, caller=%s, rc=%Rrc\n", __func__, rc));
free_page((unsigned long)path);
error = -EPROTO;
}
}
# if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
return error ? ERR_PTR(error) : (*cookie = path);
# else
nd_set_link(nd, error ? ERR_PTR(error) : path);
return NULL;
# endif
}
# if LINUX_VERSION_CODE < KERNEL_VERSION(4, 2, 0)
static void sf_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
{
char *page = nd_get_link(nd);
if (!IS_ERR(page))
free_page((unsigned long)page);
}
# endif
# else /* LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0) */
static const char *sf_get_link(struct dentry *dentry, struct inode *inode,
struct delayed_call *done)
{
struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
char *path;
int rc;
if (!dentry)
return ERR_PTR(-ECHILD);
path = kzalloc(PAGE_SIZE, GFP_KERNEL);
if (!path)
return ERR_PTR(-ENOMEM);
rc = VbglR0SfReadLink(&client_handle, &sf_g->map, sf_i->path, PATH_MAX, path);
if (RT_FAILURE(rc))
{
LogFunc(("VbglR0SfReadLink failed, caller=%s, rc=%Rrc\n", __func__, rc));
kfree(path);
return ERR_PTR(-EPROTO);
}
set_delayed_call(done, kfree_link, path);
return path;
}
static int sf_symlink(struct inode *parent, struct dentry *dentry, const char *symname)
{
int err;
int rc;
struct sf_inode_info *sf_i;
struct sf_glob_info *sf_g;
SHFLSTRING *path, *ssymname;
SHFLFSOBJINFO info;
int symname_len = strlen(symname) + 1;
TRACE();
sf_g = GET_GLOB_INFO(parent->i_sb);
sf_i = GET_INODE_INFO(parent);
BUG_ON(!sf_g);
BUG_ON(!sf_i);
err = sf_path_from_dentry(__func__, sf_g, sf_i, dentry, &path);
if (err)
goto fail0;
ssymname = kmalloc(offsetof(SHFLSTRING, String.utf8) + symname_len, GFP_KERNEL);
if (!ssymname)
{
LogRelFunc(("kmalloc failed, caller=sf_symlink\n"));
err = -ENOMEM;
goto fail1;
}
ssymname->u16Length = symname_len - 1;
ssymname->u16Size = symname_len;
memcpy(ssymname->String.utf8, symname, symname_len);
rc = vboxCallSymlink(&client_handle, &sf_g->map, path, ssymname, &info);
kfree(ssymname);
if (RT_FAILURE(rc))
{
if (rc == VERR_WRITE_PROTECT)
{
err = -EROFS;
goto fail1;
}
LogFunc(("vboxCallSymlink(%s) failed rc=%Rrc\n",
sf_i->path->String.utf8, rc));
err = -EPROTO;
goto fail1;
}
err = sf_instantiate(parent, dentry, path, &info, SHFL_HANDLE_NIL);
if (err)
{
LogFunc(("could not instantiate dentry for %s err=%d\n",
sf_i->path->String.utf8, err));
goto fail1;
}
sf_i->force_restat = 1;
return 0;
fail1:
kfree(path);
fail0:
return err;
}
/**
* Open a regular file.
*
* @param inode the inode
* @param file the file
* @returns 0 on success, Linux error code otherwise
*/
static int sf_reg_open(struct inode *inode, struct file *file)
{
int rc, rc_linux = 0;
struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
struct sf_reg_info *sf_r;
SHFLCREATEPARMS params;
TRACE();
BUG_ON(!sf_g);
BUG_ON(!sf_i);
LogFunc(("open %s\n", sf_i->path->String.utf8));
sf_r = kmalloc(sizeof(*sf_r), GFP_KERNEL);
if (!sf_r)
{
LogRelFunc(("could not allocate reg info\n"));
return -ENOMEM;
}
/* Already open? */
if (sf_i->handle != SHFL_HANDLE_NIL)
{
/*
* This inode was created with sf_create_aux(). Check the CreateFlags:
* O_CREAT, O_TRUNC: inherent true (file was just created). Not sure
* about the access flags (SHFL_CF_ACCESS_*).
*/
sf_i->force_restat = 1;
sf_r->handle = sf_i->handle;
sf_i->handle = SHFL_HANDLE_NIL;
sf_i->file = file;
file->private_data = sf_r;
return 0;
}
RT_ZERO(params);
params.Handle = SHFL_HANDLE_NIL;
/* We check the value of params.Handle afterwards to find out if
* the call succeeded or failed, as the API does not seem to cleanly
* distinguish error and informational messages.
*
* Furthermore, we must set params.Handle to SHFL_HANDLE_NIL to
* make the shared folders host service use our fMode parameter */
if (file->f_flags & O_CREAT)
{
LogFunc(("O_CREAT set\n"));
params.CreateFlags |= SHFL_CF_ACT_CREATE_IF_NEW;
/* We ignore O_EXCL, as the Linux kernel seems to call create
beforehand itself, so O_EXCL should always fail. */
if (file->f_flags & O_TRUNC)
{
LogFunc(("O_TRUNC set\n"));
params.CreateFlags |= ( SHFL_CF_ACT_OVERWRITE_IF_EXISTS
| SHFL_CF_ACCESS_WRITE);
}
else
params.CreateFlags |= SHFL_CF_ACT_OPEN_IF_EXISTS;
}
else
{
params.CreateFlags |= SHFL_CF_ACT_FAIL_IF_NEW;
if (file->f_flags & O_TRUNC)
{
LogFunc(("O_TRUNC set\n"));
params.CreateFlags |= ( SHFL_CF_ACT_OVERWRITE_IF_EXISTS
| SHFL_CF_ACCESS_WRITE);
}
}
if (!(params.CreateFlags & SHFL_CF_ACCESS_READWRITE))
{
switch (file->f_flags & O_ACCMODE)
{
case O_RDONLY:
params.CreateFlags |= SHFL_CF_ACCESS_READ;
break;
case O_WRONLY:
params.CreateFlags |= SHFL_CF_ACCESS_WRITE;
break;
case O_RDWR:
params.CreateFlags |= SHFL_CF_ACCESS_READWRITE;
break;
default:
BUG ();
}
}
if (file->f_flags & O_APPEND)
{
LogFunc(("O_APPEND set\n"));
params.CreateFlags |= SHFL_CF_ACCESS_APPEND;
}
params.Info.Attr.fMode = inode->i_mode;
LogFunc(("sf_reg_open: calling vboxCallCreate, file %s, flags=%#x, %#x\n",
sf_i->path->String.utf8 , file->f_flags, params.CreateFlags));
rc = vboxCallCreate(&client_handle, &sf_g->map, sf_i->path, ¶ms);
if (RT_FAILURE(rc))
{
LogFunc(("vboxCallCreate failed flags=%d,%#x rc=%Rrc\n",
file->f_flags, params.CreateFlags, rc));
kfree(sf_r);
return -RTErrConvertToErrno(rc);
}
if (SHFL_HANDLE_NIL == params.Handle)
{
switch (params.Result)
{
case SHFL_PATH_NOT_FOUND:
case SHFL_FILE_NOT_FOUND:
rc_linux = -ENOENT;
break;
case SHFL_FILE_EXISTS:
rc_linux = -EEXIST;
break;
default:
break;
}
}
sf_i->force_restat = 1;
sf_r->handle = params.Handle;
sf_i->file = file;
file->private_data = sf_r;
return rc_linux;
}
/**
* Write to a regular file.
*
* @param file the file
* @param buf the buffer
* @param size length of the buffer
* @param off offset within the file
* @returns the number of written bytes on success, Linux error code otherwise
*/
static ssize_t sf_reg_write(struct file *file, const char *buf, size_t size, loff_t *off)
{
int err;
void *tmp;
RTCCPHYS tmp_phys;
size_t tmp_size;
size_t left = size;
ssize_t total_bytes_written = 0;
struct inode *inode = GET_F_DENTRY(file)->d_inode;
struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
struct sf_reg_info *sf_r = file->private_data;
loff_t pos;
TRACE();
BUG_ON(!sf_i);
BUG_ON(!sf_g);
BUG_ON(!sf_r);
if (!S_ISREG(inode->i_mode))
{
LogFunc(("write to non regular file %d\n", inode->i_mode));
return -EINVAL;
}
pos = *off;
if (file->f_flags & O_APPEND)
{
pos = inode->i_size;
*off = pos;
}
/** XXX Check write permission according to inode->i_mode! */
if (!size)
return 0;
tmp = alloc_bounce_buffer(&tmp_size, &tmp_phys, size, __PRETTY_FUNCTION__);
if (!tmp)
return -ENOMEM;
while (left)
{
uint32_t to_write, nwritten;
to_write = tmp_size;
if (to_write > left)
to_write = (uint32_t) left;
nwritten = to_write;
if (copy_from_user(tmp, buf, to_write))
{
err = -EFAULT;
goto fail;
}
#if 1
if (VbglR0CanUsePhysPageList())
{
err = VbglR0SfWritePhysCont(&client_handle, &sf_g->map, sf_r->handle,
pos, &nwritten, tmp_phys);
err = RT_FAILURE(err) ? -EPROTO : 0;
}
else
#endif
err = sf_reg_write_aux(__func__, sf_g, sf_r, tmp, &nwritten, pos);
if (err)
goto fail;
pos += nwritten;
left -= nwritten;
buf += nwritten;
total_bytes_written += nwritten;
if (nwritten != to_write)
break;
}
*off += total_bytes_written;
if (*off > inode->i_size)
inode->i_size = *off;
sf_i->force_restat = 1;
free_bounce_buffer(tmp);
return total_bytes_written;
fail:
free_bounce_buffer(tmp);
return err;
}
/**
* Extract element ([dir]->f_pos) from the directory [dir] into [d_name].
*
* @returns 0 for success, 1 for end reached, Linux error code otherwise.
*/
static int sf_getdent(struct file *dir, char d_name[NAME_MAX], int *d_type)
{
loff_t cur;
struct sf_glob_info *sf_g;
struct sf_dir_info *sf_d;
struct sf_inode_info *sf_i;
struct inode *inode;
struct list_head *pos, *list;
TRACE();
inode = GET_F_DENTRY(dir)->d_inode;
sf_i = GET_INODE_INFO(inode);
sf_g = GET_GLOB_INFO(inode->i_sb);
sf_d = dir->private_data;
BUG_ON(!sf_g);
BUG_ON(!sf_d);
BUG_ON(!sf_i);
if (sf_i->force_reread)
{
int rc;
int err;
SHFLCREATEPARMS params;
RT_ZERO(params);
params.Handle = SHFL_HANDLE_NIL;
params.CreateFlags = 0
| SHFL_CF_DIRECTORY
| SHFL_CF_ACT_OPEN_IF_EXISTS
| SHFL_CF_ACT_FAIL_IF_NEW
| SHFL_CF_ACCESS_READ
;
LogFunc(("sf_getdent: calling vboxCallCreate, folder %s, flags %#x\n",
sf_i->path->String.utf8, params.CreateFlags));
rc = vboxCallCreate(&client_handle, &sf_g->map, sf_i->path, ¶ms);
if (RT_FAILURE(rc))
{
LogFunc(("vboxCallCreate(%s) failed rc=%Rrc\n",
sf_i->path->String.utf8, rc));
return -EPERM;
}
if (params.Result != SHFL_FILE_EXISTS)
{
LogFunc(("directory %s does not exist\n", sf_i->path->String.utf8));
sf_dir_info_free(sf_d);
return -ENOENT;
}
sf_dir_info_empty(sf_d);
err = sf_dir_read_all(sf_g, sf_i, sf_d, params.Handle);
rc = vboxCallClose(&client_handle, &sf_g->map, params.Handle);
if (RT_FAILURE(rc))
LogFunc(("vboxCallClose(%s) failed rc=%Rrc\n", sf_i->path->String.utf8, rc));
if (err)
return err;
sf_i->force_reread = 0;
}
cur = 0;
list = &sf_d->info_list;
list_for_each(pos, list)
{
struct sf_dir_buf *b;
SHFLDIRINFO *info;
loff_t i;
b = list_entry(pos, struct sf_dir_buf, head);
if (dir->f_pos >= cur + b->cEntries)
{
cur += b->cEntries;
continue;
}
for (i = 0, info = b->buf; i < dir->f_pos - cur; ++i)
{
size_t size;
size = offsetof(SHFLDIRINFO, name.String) + info->name.u16Size;
info = (SHFLDIRINFO *) ((uintptr_t) info + size);
}
*d_type = sf_get_d_type(info->Info.Attr.fMode);
return sf_nlscpy(sf_g, d_name, NAME_MAX,
info->name.String.utf8, info->name.u16Length);
}
return 1;
}
int sf_setattr(struct dentry *dentry, struct iattr *iattr)
{
struct sf_glob_info *sf_g;
struct sf_inode_info *sf_i;
SHFLCREATEPARMS params;
SHFLFSOBJINFO info;
uint32_t cbBuffer;
int rc, err;
TRACE();
sf_g = GET_GLOB_INFO(dentry->d_inode->i_sb);
sf_i = GET_INODE_INFO(dentry->d_inode);
err = 0;
RT_ZERO(params);
params.Handle = SHFL_HANDLE_NIL;
params.CreateFlags = SHFL_CF_ACT_OPEN_IF_EXISTS
| SHFL_CF_ACT_FAIL_IF_NEW
| SHFL_CF_ACCESS_ATTR_WRITE;
/* this is at least required for Posix hosts */
if (iattr->ia_valid & ATTR_SIZE)
params.CreateFlags |= SHFL_CF_ACCESS_WRITE;
rc = VbglR0SfCreate(&client_handle, &sf_g->map, sf_i->path, ¶ms);
if (RT_FAILURE(rc))
{
LogFunc(("VbglR0SfCreate(%s) failed rc=%Rrc\n",
sf_i->path->String.utf8, rc));
err = -RTErrConvertToErrno(rc);
goto fail2;
}
if (params.Result != SHFL_FILE_EXISTS)
{
LogFunc(("file %s does not exist\n", sf_i->path->String.utf8));
err = -ENOENT;
goto fail1;
}
/* Setting the file size and setting the other attributes has to be
* handled separately, see implementation of vbsfSetFSInfo() in
* vbsf.cpp */
if (iattr->ia_valid & (ATTR_MODE | ATTR_ATIME | ATTR_MTIME))
{
#define mode_set(r) ((iattr->ia_mode & (S_##r)) ? RTFS_UNIX_##r : 0)
RT_ZERO(info);
if (iattr->ia_valid & ATTR_MODE)
{
info.Attr.fMode = mode_set(ISUID);
info.Attr.fMode |= mode_set(ISGID);
info.Attr.fMode |= mode_set(IRUSR);
info.Attr.fMode |= mode_set(IWUSR);
info.Attr.fMode |= mode_set(IXUSR);
info.Attr.fMode |= mode_set(IRGRP);
info.Attr.fMode |= mode_set(IWGRP);
info.Attr.fMode |= mode_set(IXGRP);
info.Attr.fMode |= mode_set(IROTH);
info.Attr.fMode |= mode_set(IWOTH);
info.Attr.fMode |= mode_set(IXOTH);
if (iattr->ia_mode & S_IFDIR)
info.Attr.fMode |= RTFS_TYPE_DIRECTORY;
else
info.Attr.fMode |= RTFS_TYPE_FILE;
}
if (iattr->ia_valid & ATTR_ATIME)
sf_timespec_from_ftime(&info.AccessTime, &iattr->ia_atime);
if (iattr->ia_valid & ATTR_MTIME)
sf_timespec_from_ftime(&info.ModificationTime, &iattr->ia_mtime);
/* ignore ctime (inode change time) as it can't be set from userland anyway */
cbBuffer = sizeof(info);
rc = VbglR0SfFsInfo(&client_handle, &sf_g->map, params.Handle,
SHFL_INFO_SET | SHFL_INFO_FILE, &cbBuffer,
(PSHFLDIRINFO)&info);
if (RT_FAILURE(rc))
{
LogFunc(("VbglR0SfFsInfo(%s, FILE) failed rc=%Rrc\n",
sf_i->path->String.utf8, rc));
err = -RTErrConvertToErrno(rc);
goto fail1;
}
}
if (iattr->ia_valid & ATTR_SIZE)
{
RT_ZERO(info);
info.cbObject = iattr->ia_size;
cbBuffer = sizeof(info);
rc = VbglR0SfFsInfo(&client_handle, &sf_g->map, params.Handle,
SHFL_INFO_SET | SHFL_INFO_SIZE, &cbBuffer,
(PSHFLDIRINFO)&info);
if (RT_FAILURE(rc))
{
LogFunc(("VbglR0SfFsInfo(%s, SIZE) failed rc=%Rrc\n",
sf_i->path->String.utf8, rc));
err = -RTErrConvertToErrno(rc);
goto fail1;
}
}
rc = VbglR0SfClose(&client_handle, &sf_g->map, params.Handle);
if (RT_FAILURE(rc))
LogFunc(("VbglR0SfClose(%s) failed rc=%Rrc\n", sf_i->path->String.utf8, rc));
return sf_inode_revalidate(dentry);
fail1:
rc = VbglR0SfClose(&client_handle, &sf_g->map, params.Handle);
if (RT_FAILURE(rc))
LogFunc(("VbglR0SfClose(%s) failed rc=%Rrc\n", sf_i->path->String.utf8, rc));
fail2:
return err;
}
/**
* Open a directory. Read the complete content into a buffer.
*
* @param inode inode
* @param file file
* @returns 0 on success, Linux error code otherwise
*/
static int sf_dir_open(struct inode *inode, struct file *file)
{
int rc;
int err;
struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
struct sf_dir_info *sf_d;
struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
SHFLCREATEPARMS params;
TRACE();
BUG_ON(!sf_g);
BUG_ON(!sf_i);
if (file->private_data)
{
LogFunc(("sf_dir_open() called on already opened directory '%s'\n",
sf_i->path->String.utf8));
return 0;
}
sf_d = sf_dir_info_alloc();
if (!sf_d)
{
LogRelFunc(("could not allocate directory info for '%s'\n",
sf_i->path->String.utf8));
return -ENOMEM;
}
RT_ZERO(params);
params.Handle = SHFL_HANDLE_NIL;
params.CreateFlags = 0
| SHFL_CF_DIRECTORY
| SHFL_CF_ACT_OPEN_IF_EXISTS
| SHFL_CF_ACT_FAIL_IF_NEW
| SHFL_CF_ACCESS_READ
;
LogFunc(("sf_dir_open(): calling vboxCallCreate, folder %s, flags %#x\n",
sf_i->path->String.utf8, params.CreateFlags));
rc = vboxCallCreate(&client_handle, &sf_g->map, sf_i->path, ¶ms);
if (RT_SUCCESS(rc))
{
if (params.Result == SHFL_FILE_EXISTS)
{
err = sf_dir_read_all(sf_g, sf_i, sf_d, params.Handle);
if (!err)
file->private_data = sf_d;
}
else
err = -ENOENT;
rc = vboxCallClose(&client_handle, &sf_g->map, params.Handle);
if (RT_FAILURE(rc))
LogFunc(("sf_dir_open(): vboxCallClose(%s) after err=%d failed rc=%Rrc\n",
sf_i->path->String.utf8, err, rc));
}
else
err = -EPERM;
if (err)
sf_dir_info_free(sf_d);
return err;
}
/**
* This is called when vfs failed to locate dentry in the cache. The
* job of this function is to allocate inode and link it to dentry.
* [dentry] contains the name to be looked in the [parent] directory.
* Failure to locate the name is not a "hard" error, in this case NULL
* inode is added to [dentry] and vfs should proceed trying to create
* the entry via other means. NULL(or "positive" pointer) ought to be
* returned in case of success and "negative" pointer on error
*/
static struct dentry *sf_lookup(struct inode *parent, struct dentry *dentry
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)
, unsigned int flags
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
, struct nameidata *nd
#endif
)
{
int err;
struct sf_inode_info *sf_i, *sf_new_i;
struct sf_glob_info *sf_g;
SHFLSTRING *path;
struct inode *inode;
ino_t ino;
SHFLFSOBJINFO fsinfo;
TRACE();
sf_g = GET_GLOB_INFO(parent->i_sb);
sf_i = GET_INODE_INFO(parent);
BUG_ON(!sf_g);
BUG_ON(!sf_i);
err = sf_path_from_dentry(__func__, sf_g, sf_i, dentry, &path);
if (err)
goto fail0;
err = sf_stat(__func__, sf_g, path, &fsinfo, 1);
if (err)
{
if (err == -ENOENT)
{
/* -ENOENT: add NULL inode to dentry so it later can be
created via call to create/mkdir/open */
kfree(path);
inode = NULL;
}
else
goto fail1;
}
else
{
sf_new_i = kmalloc(sizeof(*sf_new_i), GFP_KERNEL);
if (!sf_new_i)
{
LogRelFunc(("could not allocate memory for new inode info\n"));
err = -ENOMEM;
goto fail1;
}
sf_new_i->handle = SHFL_HANDLE_NIL;
sf_new_i->force_reread = 0;
ino = iunique(parent->i_sb, 1);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 25)
inode = iget_locked(parent->i_sb, ino);
#else
inode = iget(parent->i_sb, ino);
#endif
if (!inode)
{
LogFunc(("iget failed\n"));
err = -ENOMEM; /* XXX: ??? */
goto fail2;
}
SET_INODE_INFO(inode, sf_new_i);
sf_init_inode(sf_g, inode, &fsinfo);
sf_new_i->path = path;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 25)
unlock_new_inode(inode);
#endif
}
sf_i->force_restat = 0;
dentry->d_time = jiffies;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 38)
d_set_d_op(dentry, &sf_dentry_ops);
#else
dentry->d_op = &sf_dentry_ops;
#endif
d_add(dentry, inode);
return NULL;
fail2:
kfree(sf_new_i);
fail1:
kfree(path);
fail0:
return ERR_PTR(err);
}
/**
* Create a new regular file / directory.
*
* @param parent inode of the directory
* @param dentry directory cache entry
* @param mode file mode
* @param fDirectory true if directory, false otherwise
* @returns 0 on success, Linux error code otherwise
*/
static int sf_create_aux(struct inode *parent, struct dentry *dentry,
umode_t mode, int fDirectory)
{
int rc, err;
SHFLCREATEPARMS params;
SHFLSTRING *path;
struct sf_inode_info *sf_i = GET_INODE_INFO(parent);
struct sf_glob_info *sf_g = GET_GLOB_INFO(parent->i_sb);
TRACE();
BUG_ON(!sf_i);
BUG_ON(!sf_g);
err = sf_path_from_dentry(__func__, sf_g, sf_i, dentry, &path);
if (err)
goto fail0;
RT_ZERO(params);
params.Handle = SHFL_HANDLE_NIL;
params.CreateFlags = 0
| SHFL_CF_ACT_CREATE_IF_NEW
| SHFL_CF_ACT_FAIL_IF_EXISTS
| SHFL_CF_ACCESS_READWRITE
| (fDirectory ? SHFL_CF_DIRECTORY : 0)
;
params.Info.Attr.fMode = 0
| (fDirectory ? RTFS_TYPE_DIRECTORY : RTFS_TYPE_FILE)
| (mode & S_IRWXUGO)
;
params.Info.Attr.enmAdditional = RTFSOBJATTRADD_NOTHING;
LogFunc(("sf_create_aux: calling vboxCallCreate, folder %s, flags %#x\n",
path->String.utf8, params.CreateFlags));
rc = vboxCallCreate(&client_handle, &sf_g->map, path, ¶ms);
if (RT_FAILURE(rc))
{
if (rc == VERR_WRITE_PROTECT)
{
err = -EROFS;
goto fail1;
}
err = -EPROTO;
LogFunc(("(%d): vboxCallCreate(%s) failed rc=%Rrc\n",
fDirectory, sf_i->path->String.utf8, rc));
goto fail1;
}
if (params.Result != SHFL_FILE_CREATED)
{
err = -EPERM;
LogFunc(("(%d): could not create file %s result=%d\n",
fDirectory, sf_i->path->String.utf8, params.Result));
goto fail1;
}
err = sf_instantiate(parent, dentry, path, ¶ms.Info,
fDirectory ? SHFL_HANDLE_NIL : params.Handle);
if (err)
{
LogFunc(("(%d): could not instantiate dentry for %s err=%d\n",
fDirectory, sf_i->path->String.utf8, err));
goto fail2;
}
/*
* Don't close this handle right now. We assume that the same file is
* opened with sf_reg_open() and later closed with sf_reg_close(). Save
* the handle in between. Does not apply to directories. True?
*/
if (fDirectory)
{
rc = vboxCallClose(&client_handle, &sf_g->map, params.Handle);
if (RT_FAILURE(rc))
LogFunc(("(%d): vboxCallClose failed rc=%Rrc\n", fDirectory, rc));
}
sf_i->force_restat = 1;
return 0;
fail2:
rc = vboxCallClose(&client_handle, &sf_g->map, params.Handle);
if (RT_FAILURE(rc))
LogFunc(("(%d): vboxCallClose failed rc=%Rrc\n", fDirectory, rc));
fail1:
kfree(path);
fail0:
return err;
}
