static int
HgfsFollowlink(struct dentry *dentry, // IN: Dentry containing link
struct nameidata *nd) // OUT: Contains target dentry
#endif
{
HgfsAttrInfo attr;
char *fileName = NULL;
int error;
ASSERT(dentry);
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 2, 0)
ASSERT(nd);
#endif
if (!dentry) {
LOG(4, (KERN_DEBUG "VMware hgfs: HgfsFollowlink: null input\n"));
error = -EINVAL;
goto out;
}
LOG(6, (KERN_DEBUG "VMware hgfs: %s: calling HgfsPrivateGetattr %s\n",
__func__, dentry->d_name.name));
error = HgfsPrivateGetattr(dentry, &attr, &fileName);
LOG(6, (KERN_DEBUG "VMware hgfs: %s: HgfsPrivateGetattr %s ret %d\n",
__func__, dentry->d_name.name, error));
if (!error) {
/* Let's make sure we got called on a symlink. */
if (attr.type != HGFS_FILE_TYPE_SYMLINK || fileName == NULL) {
LOG(6, (KERN_DEBUG "VMware hgfs: HgfsFollowlink: got called "
"on something that wasn't a symlink\n"));
error = -EINVAL;
kfree(fileName);
} else {
LOG(6, (KERN_DEBUG "VMware hgfs: %s: calling nd_set_link %s\n",
__func__, fileName));
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
*cookie = fileName;
#else
nd_set_link(nd, fileName);
#endif
}
}
out:
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
if (!error) {
return *cookie;
} else {
return ERR_PTR(error);
}
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 13)
return ERR_PTR(error);
#else
return error;
#endif
}
static int
HgfsFollowlink(struct dentry *dentry, // IN: Dentry containing link
struct nameidata *nd) // OUT: Contains target dentry
#endif
{
HgfsAttrInfo attr;
char *fileName = NULL;
int error;
ASSERT(dentry);
ASSERT(nd);
if (!dentry) {
LOG(4, (KERN_DEBUG "VMware hgfs: HgfsFollowlink: null input\n"));
error = -EINVAL;
goto out;
}
LOG(6, (KERN_DEBUG "VMware hgfs: HgfsFollowlink: calling "
"HgfsPrivateGetattr\n"));
error = HgfsPrivateGetattr(dentry, &attr, &fileName);
if (!error) {
/* Let's make sure we got called on a symlink. */
if (attr.type != HGFS_FILE_TYPE_SYMLINK || fileName == NULL) {
LOG(6, (KERN_DEBUG "VMware hgfs: HgfsFollowlink: got called "
"on something that wasn't a symlink\n"));
error = -EINVAL;
} else {
LOG(6, (KERN_DEBUG "VMware hgfs: HgfsFollowlink: calling "
"vfs_follow_link\n"));
error = vfs_follow_link(nd, fileName);
}
kfree(fileName);
}
out:
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 13)
return ERR_PTR(error);
#else
return error;
#endif
}
static int
HgfsReadlink(struct dentry *dentry, // IN: Dentry containing link
char __user *buffer, // OUT: User buffer to copy link into
int buflen) // IN: Length of user buffer
{
HgfsAttrInfo attr;
char *fileName = NULL;
int error;
ASSERT(dentry);
ASSERT(buffer);
if (!dentry) {
LOG(4, (KERN_DEBUG "VMware hgfs: HgfsReadlink: null input\n"));
return -EINVAL;
}
LOG(6, (KERN_DEBUG "VMware hgfs: %s: calling HgfsPrivateGetattr %s\n",
__func__, dentry->d_name.name));
error = HgfsPrivateGetattr(dentry, &attr, &fileName);
if (!error) {
/* Let's make sure we got called on a symlink. */
if (attr.type != HGFS_FILE_TYPE_SYMLINK || fileName == NULL) {
LOG(6, (KERN_DEBUG "VMware hgfs: HgfsReadlink: got called "
"on something that wasn't a symlink\n"));
error = -EINVAL;
} else {
LOG(6, (KERN_DEBUG "VMware hgfs: %s: calling vfs_readlink %s\n",
__func__, fileName));
error = HGFS_DO_READLINK(dentry, buffer, buflen, fileName);
LOG(6, (KERN_DEBUG "VMware hgfs: %s: vfs_readlink %s ret %dn",
__func__, fileName, error));
}
kfree(fileName);
}
return error;
}
static int
HgfsGetRootDentry(struct super_block *sb, // IN: Super block object
struct dentry **rootDentry) // OUT: Root dentry
{
int result = -ENOMEM;
struct inode *rootInode;
struct dentry *tempRootDentry = NULL;
struct HgfsAttrInfo rootDentryAttr;
HgfsInodeInfo *iinfo;
ASSERT(sb);
ASSERT(rootDentry);
LOG(6, (KERN_DEBUG "VMware hgfs: %s: entered\n", __func__));
rootInode = HgfsGetInode(sb, HGFS_ROOT_INO);
if (rootInode == NULL) {
LOG(6, (KERN_DEBUG "VMware hgfs: %s: Could not get the root inode\n",
__func__));
goto exit;
}
/*
* On an allocation failure in read_super, the inode will have been
* marked "bad". If it was, we certainly don't want to start playing with
* the HgfsInodeInfo. So quietly put the inode back and fail.
*/
if (is_bad_inode(rootInode)) {
LOG(6, (KERN_DEBUG "VMware hgfs: %s: encountered bad inode\n",
__func__));
goto exit;
}
tempRootDentry = d_alloc_root(rootInode);
if (tempRootDentry == NULL) {
LOG(4, (KERN_WARNING "VMware hgfs: %s: Could not get "
"root dentry\n", __func__));
goto exit;
}
rootInode = NULL;
result = HgfsPrivateGetattr(tempRootDentry, &rootDentryAttr, NULL);
if (result) {
LOG(4, (KERN_WARNING "VMware hgfs: HgfsReadSuper: Could not"
"instantiate the root dentry\n"));
goto exit;
}
iinfo = INODE_GET_II_P(tempRootDentry->d_inode);
iinfo->isFakeInodeNumber = FALSE;
iinfo->isReferencedInode = TRUE;
if (rootDentryAttr.mask & HGFS_ATTR_VALID_FILEID) {
iinfo->hostFileId = rootDentryAttr.hostFileId;
}
HgfsChangeFileAttributes(tempRootDentry->d_inode, &rootDentryAttr);
HgfsDentryAgeReset(tempRootDentry);
tempRootDentry->d_op = &HgfsDentryOperations;
*rootDentry = tempRootDentry;
result = 0;
LOG(6, (KERN_DEBUG "VMware hgfs: %s: finished\n", __func__));
exit:
if (result) {
iput(rootInode);
dput(tempRootDentry);
*rootDentry = NULL;
}
return result;
}
