static ssize_t
HgfsWrite(struct file *file, // IN: File to write to
const char __user *buf, // IN: User buffer where the data is
size_t count, // IN: Number of bytes to write
loff_t *offset) // IN: Offset to begin writing at
{
int result;
ASSERT(file);
ASSERT(file->f_dentry);
ASSERT(file->f_dentry->d_inode);
ASSERT(buf);
ASSERT(offset);
LOG(6, (KERN_DEBUG "VMware hgfs: HgfsWrite: write %Zu bytes to fh %u "
"at offset %Lu\n", count, FILE_GET_FI_P(file)->handle, *offset));
result = HgfsRevalidate(file->f_dentry);
if (result) {
LOG(4, (KERN_DEBUG "VMware hgfs: HgfsWrite: invalid dentry\n"));
goto out;
}
result = generic_file_write(file, buf, count, offset);
out:
return result;
}
static loff_t
HgfsSeek(struct file *file, // IN: File to seek
loff_t offset, // IN: Number of bytes to seek
int origin) // IN: Position to seek from
{
loff_t result = -1;
ASSERT(file);
ASSERT(file->f_dentry);
LOG(6, (KERN_DEBUG "VMware hgfs: HgfsSeek: seek to %Lu bytes from fh %u "
"from position %d\n", offset, FILE_GET_FI_P(file)->handle, origin));
result = (loff_t) HgfsRevalidate(file->f_dentry);
if (result) {
LOG(6, (KERN_DEBUG "VMware hgfs: HgfsSeek: invalid dentry\n"));
goto out;
}
result = generic_file_llseek(file, offset, origin);
out:
return result;
}
static ssize_t
HgfsRead(struct file *file, // IN: File to read from
char __user *buf, // OUT: User buffer to copy data into
size_t count, // IN: Number of bytes to read
loff_t *offset) // IN: Offset at which to read
{
int result;
ASSERT(file);
ASSERT(file->f_dentry);
ASSERT(buf);
ASSERT(offset);
LOG(6, (KERN_DEBUG "VMware hgfs: HgfsRead: read %Zu bytes from fh %u "
"at offset %Lu\n", count, FILE_GET_FI_P(file)->handle, *offset));
result = HgfsRevalidate(file->f_dentry);
if (result) {
LOG(4, (KERN_DEBUG "VMware hgfs: HgfsRead: invalid dentry\n"));
goto out;
}
result = generic_file_read(file, buf, count, offset);
out:
return result;
}
static ssize_t
HgfsAioWrite(struct kiocb *iocb, // IN: I/O control block
const struct iovec *iov, // IN: Array of I/O buffers
unsigned long numSegs, // IN: Number of buffers
loff_t offset) // IN: Offset at which to read
{
int result;
ASSERT(iocb);
ASSERT(iocb->ki_filp);
ASSERT(iocb->ki_filp->f_dentry);
ASSERT(iov);
LOG(6, (KERN_DEBUG "VMware hgfs: HgfsAioWrite: was called\n"));
result = HgfsRevalidate(iocb->ki_filp->f_dentry);
if (result) {
LOG(4, (KERN_DEBUG "VMware hgfs: HgfsAioWrite: invalid dentry\n"));
goto out;
}
result = generic_file_aio_write(iocb, iov, numSegs, offset);
out:
return result;
}
static ssize_t
HgfsSpliceRead(struct file *file, // IN: File to read from
loff_t *offset, // IN/OUT: Where to start reading
struct pipe_inode_info *pipe, // IN: Pipe where to write data
size_t len, // IN: How much to read
unsigned int flags) // IN: Various flags
{
ssize_t result;
ASSERT(file);
ASSERT(file->f_dentry);
LOG(6, (KERN_DEBUG "VMware hgfs: HgfsSpliceRead: was called\n"));
result = HgfsRevalidate(file->f_dentry);
if (result) {
LOG(4, (KERN_DEBUG "VMware hgfs: HgfsSpliceRead: invalid dentry\n"));
goto out;
}
result = generic_file_splice_read(file, offset, pipe, len, flags);
out:
return result;
}
static ssize_t
HgfsSendfile(struct file *file, // IN: File to read from
loff_t *offset, // IN/OUT: Where to start reading
size_t count, // IN: How much to read
read_actor_t actor, // IN: Routine to send a page of data
void *target) // IN: Destination file/socket
#endif
{
ssize_t result;
ASSERT(file);
ASSERT(file->f_dentry);
ASSERT(target);
ASSERT(offset);
ASSERT(actor);
LOG(6, (KERN_DEBUG "VMware hgfs: HgfsSendfile: was called\n"));
result = HgfsRevalidate(file->f_dentry);
if (result) {
LOG(4, (KERN_DEBUG "VMware hgfs: HgfsSendfile: invalid dentry\n"));
goto out;
}
result = generic_file_sendfile (file, offset, count, actor, target);
out:
return result;
}
static int
HgfsDentryRevalidate(struct dentry *dentry, // IN: Dentry to revalidate
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)
unsigned int flags // IN: Lookup flags & intent
#else
struct nameidata *nd // IN: Lookup flags & intent
#endif
)
{
int error;
LOG(6, (KERN_DEBUG "VMware hgfs: HgfsDentryRevalidate: calling "
"HgfsRevalidate\n"));
ASSERT(dentry);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0)
if (flags & LOOKUP_RCU) {
return -ECHILD;
}
#elif defined(LOOKUP_RCU) /* Introduced in 2.6.38 */
if (nd && (nd->flags & LOOKUP_RCU)) {
return -ECHILD;
}
#endif
/* Just call HgfsRevaliate, which does the right thing. */
error = HgfsRevalidate(dentry);
if (error) {
LOG(4, (KERN_DEBUG "VMware hgfs: HgfsDentryRevalidate: invalid\n"));
if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) {
shrink_dcache_parent(dentry);
}
d_drop(dentry);
return 0;
}
LOG(6, (KERN_DEBUG "VMware hgfs: HgfsDentryRevalidate: valid\n"));
return 1;
}
static int
HgfsMmap(struct file *file, // IN: File we operate on
struct vm_area_struct *vma) // IN/OUT: VM area information
{
int result;
ASSERT(file);
ASSERT(vma);
ASSERT(file->f_dentry);
LOG(6, (KERN_DEBUG "VMware hgfs: HgfsMmap: was called\n"));
result = HgfsRevalidate(file->f_dentry);
if (result) {
LOG(4, (KERN_DEBUG "VMware hgfs: HgfsMmap: invalid dentry\n"));
goto out;
}
result = generic_file_mmap(file, vma);
out:
return result;
}
