// reiserfs_open
static status_t
reiserfs_open(fs_volume *fs, fs_vnode *_node, int openMode, void **cookie)
{
// FUNCTION_START();
Volume *volume = (Volume*)fs->private_volume;
VNode *node = (VNode*)_node->private_node;
FUNCTION(("node: (%Ld: %lu, %lu)\n", node->GetID(), node->GetDirID(),
node->GetObjectID()));
status_t error = B_OK;
// check the open mode
if ((openMode & O_RWMASK) == O_WRONLY || (openMode & O_RWMASK) == O_RDWR
|| (openMode & (O_TRUNC | O_CREAT))) {
error = B_READ_ONLY_DEVICE;
}
// create a StreamReader
if (error == B_OK) {
StreamReader *reader = new(nothrow) StreamReader(volume->GetTree(),
node->GetDirID(), node->GetObjectID());
if (reader) {
error = reader->Suspend();
if (error == B_OK)
*cookie = reader;
else
delete reader;
} else
error = B_NO_MEMORY;
}
RETURN_ERROR(error);
}
// reiserfs_read
static status_t
reiserfs_read(fs_volume *fs, fs_vnode *_node, void *cookie, off_t pos,
void *buffer, size_t *bufferSize)
{
TOUCH(fs);
// FUNCTION_START();
// Volume *volume = (Volume*)fs->private_volume;
VNode *node = (VNode*)_node->private_node;
FUNCTION(("((%Ld: %lu, %lu), %Ld, %p, %lu)\n", node->GetID(),
node->GetDirID(), node->GetObjectID(), pos, buffer,
*bufferSize));
status_t error = B_OK;
// don't read anything but files
if (!node->IsFile()) {
if (node->IsDir())
error = B_IS_A_DIRECTORY;
else
error = B_BAD_VALUE;
}
// read
StreamReader *reader = (StreamReader*)cookie;
if (error == B_OK) {
error = reader->Resume();
if (error == B_OK) {
error = reader->ReadAt(pos, buffer, *bufferSize, bufferSize);
reader->Suspend();
}
}
RETURN_ERROR(error);
}
// reiserfs_close_dir
static status_t
reiserfs_close_dir(fs_volume *fs, fs_vnode *_node, void *cookie)
{
TOUCH(fs); TOUCH(cookie);
// FUNCTION_START();
VNode *node = (VNode*)_node->private_node;
FUNCTION(("node: (%Ld: %lu, %lu)\n", node->GetID(), node->GetDirID(),
node->GetObjectID()));
TOUCH(node);
return B_OK;
}
// reiserfs_lookup
static status_t
reiserfs_lookup(fs_volume* fs, fs_vnode* _dir, const char *entryName,
ino_t *vnid)
{
// FUNCTION_START();
Volume *volume = (Volume*)fs->private_volume;
VNode *dir = (VNode*)_dir->private_node;
FUNCTION(("dir: (%Ld: %lu, %lu), entry: `%s'\n", dir->GetID(), dir->GetDirID(),
dir->GetObjectID(), entryName));
status_t error = B_OK;
VNode *entryNode = NULL;
// check for non-directories
if (!dir->IsDir()) {
error = B_ENTRY_NOT_FOUND;
// special entries: "." and ".."
} else if (!strcmp(entryName, ".")) {
*vnid = dir->GetID();
if (volume->GetVNode(*vnid, &entryNode) != B_OK)
error = B_BAD_VALUE;
} else if (!strcmp(entryName, "..")) {
*vnid = dir->GetParentID();
if (volume->GetVNode(*vnid, &entryNode) != B_OK)
error = B_BAD_VALUE;
// ordinary entries
} else {
// find the entry
VNode foundNode;
error = volume->FindDirEntry(dir, entryName, &foundNode, true);
// hide non-file/dir/symlink entries, if the user desires that, and
// those entries explicitly set to hidden
if (error == B_OK
&& ((foundNode.IsEsoteric() && volume->GetHideEsoteric())
|| volume->IsNegativeEntry(foundNode.GetID()))) {
error = B_ENTRY_NOT_FOUND;
}
if (error == B_OK) {
*vnid = foundNode.GetID();
error = volume->GetVNode(*vnid, &entryNode);
}
}
// add to the entry cache
if (error == B_OK) {
entry_cache_add(volume->GetID(), dir->GetID(), entryName,
*vnid);
}
RETURN_ERROR(error);
}
// reiserfs_free_dir_cookie
static status_t
reiserfs_free_dir_cookie(fs_volume *fs, fs_vnode *_node, void *cookie)
{
TOUCH(fs);
// FUNCTION_START();
VNode *node = (VNode*)_node->private_node;
FUNCTION(("node: (%Ld: %lu, %lu)\n", node->GetID(), node->GetDirID(),
node->GetObjectID()));
TOUCH(node);
DirectoryCookie *iterator = (DirectoryCookie*)cookie;
delete iterator;
return B_OK;
}
// reiserfs_free_cookie
static status_t
reiserfs_free_cookie(fs_volume *fs, fs_vnode *_node, void *cookie)
{
TOUCH(fs);
// FUNCTION_START();
VNode *node = (VNode*)_node->private_node;
FUNCTION(("node: (%Ld: %lu, %lu)\n", node->GetID(), node->GetDirID(),
node->GetObjectID()));
TOUCH(node);
StreamReader *reader = (StreamReader*)cookie;
delete reader;
return B_OK;
}
// reiserfs_rewind_dir
static status_t
reiserfs_rewind_dir(fs_volume *fs, fs_vnode *_node, void *cookie)
{
TOUCH(fs);
// FUNCTION_START();
VNode *node = (VNode*)_node->private_node;
FUNCTION(("node: (%Ld: %lu, %lu)\n", node->GetID(), node->GetDirID(),
node->GetObjectID()));
TOUCH(node);
DirectoryCookie *iterator = (DirectoryCookie*)cookie;
status_t error = iterator->Rewind(); // no need to Resume()
if (error == B_OK)
error = iterator->Suspend();
RETURN_ERROR(error);
}
// reiserfs_open_dir
static status_t
reiserfs_open_dir(fs_volume *fs, fs_vnode *_node, void **cookie)
{
// FUNCTION_START();
Volume *volume = (Volume*)fs->private_volume;
VNode *node = (VNode*)_node->private_node;
FUNCTION(("node: (%Ld: %lu, %lu)\n", node->GetID(), node->GetDirID(),
node->GetObjectID()));
status_t error = (node->IsDir() ? B_OK : B_NOT_A_DIRECTORY);
if (error == B_OK) {
DirectoryCookie *iterator = new(nothrow) DirectoryCookie(
volume->GetTree(), node->GetDirID(), node->GetObjectID());
if (iterator) {
error = iterator->Suspend();
if (error == B_OK)
*cookie = iterator;
else
delete iterator;
} else
error = B_NO_MEMORY;
}
FUNCTION_END();
RETURN_ERROR(error);
}
// reiserfs_read_symlink
static status_t
reiserfs_read_symlink(fs_volume *fs, fs_vnode *_node, char *buffer,
size_t *bufferSize)
{
// FUNCTION_START();
Volume *volume = (Volume*)fs->private_volume;
VNode *node = (VNode*)_node->private_node;
FUNCTION(("node: (%Ld: %lu, %lu)\n", node->GetID(), node->GetDirID(),
node->GetObjectID()));
status_t error = B_OK;
// read symlinks only
if (!node->IsSymlink())
error = B_BAD_VALUE;
// read
if (error == B_OK)
error = volume->ReadLink(node, buffer, *bufferSize, bufferSize);
RETURN_ERROR(error);
}
// reiserfs_access
static status_t
reiserfs_access(fs_volume *fs, fs_vnode *_node, int mode)
{
TOUCH(fs);
// FUNCTION_START();
// Volume *volume = (Volume*)fs->private_volume;
VNode *node = (VNode*)_node->private_node;
FUNCTION(("node: (%Ld: %lu, %lu)\n", node->GetID(), node->GetDirID(),
node->GetObjectID()));
// write access requested?
if (mode & W_OK)
return B_READ_ONLY_DEVICE;
// get node permissions
StatData *statData = node->GetStatData();
int userPermissions = (statData->GetMode() & S_IRWXU) >> 6;
int groupPermissions = (statData->GetMode() & S_IRWXG) >> 3;
int otherPermissions = statData->GetMode() & S_IRWXO;
// get the permissions for this uid/gid
int permissions = 0;
uid_t uid = geteuid();
// user is root
if (uid == 0) {
// root has always read/write permission, but at least one of the
// X bits must be set for execute permission
permissions = userPermissions | groupPermissions | otherPermissions
| S_IROTH | S_IWOTH;
// user is node owner
} else if (uid == statData->GetUID())
permissions = userPermissions;
// user is in owning group
else if (is_user_in_group(statData->GetGID()))
permissions = groupPermissions;
// user is one of the others
else
permissions = otherPermissions;
// do the check
if (mode & ~permissions)
return B_NOT_ALLOWED;
return B_OK;
}
// reiserfs_read_stat
static status_t
reiserfs_read_stat(fs_volume *fs, fs_vnode *_node, struct stat *st)
{
// FUNCTION_START();
Volume *volume = (Volume*)fs->private_volume;
VNode *node = (VNode*)_node->private_node;
FUNCTION(("node: (%Ld: %lu, %lu)\n", node->GetID(), node->GetDirID(),
node->GetObjectID()));
status_t error = B_OK;
StatData *statData = node->GetStatData();
st->st_dev = volume->GetID();
st->st_ino = node->GetID();
st->st_mode = statData->GetMode();
st->st_nlink = statData->GetNLink();
st->st_uid = statData->GetUID();
st->st_gid = statData->GetGID();
st->st_size = statData->GetSize();
st->st_blksize = kOptimalIOSize;
st->st_atime = statData->GetATime();
st->st_mtime = st->st_ctime = statData->GetMTime();
st->st_crtime = statData->GetCTime();
RETURN_ERROR(error);
}
// reiserfs_read_dir
static status_t
reiserfs_read_dir(fs_volume *fs, fs_vnode *_node, void *cookie,
struct dirent *buffer, size_t bufferSize, uint32 *count)
{
// FUNCTION_START();
Volume *volume = (Volume*)fs->private_volume;
VNode *node = (VNode*)_node->private_node;
FUNCTION(("node: (%Ld: %lu, %lu)\n", node->GetID(), node->GetDirID(),
node->GetObjectID()));
DirectoryCookie *iterator = (DirectoryCookie*)cookie;
status_t error = iterator->Resume();
if (error == B_OK) {
// read one entry
DirItem item;
int32 index = 0;
DirEntry *entry = NULL;
bool done = false;
while (error == B_OK && !done
&& (error = iterator->GetNext(&item, &index, &entry)) == B_OK) {
uint32 dirID = entry->GetDirID();
uint32 objectID = entry->GetObjectID();
// skip hidden entries and entries the user specified to be hidden
if (entry->IsHidden() || volume->IsNegativeEntry(dirID, objectID))
continue;
// skip entry, if we can't get the stat data, or it is neither a
// file, a dir nor a symlink and the user desired to hide those.
StatData statData;
StatItem statItem;
if (volume->GetTree()->FindStatItem(dirID, objectID, &statItem)
!= B_OK
|| statItem.GetStatData(&statData) != B_OK
|| (statData.IsEsoteric() && volume->GetHideEsoteric())) {
continue;
}
if (error == B_OK) {
// get the name
size_t nameLen = 0;
const char *name = item.EntryNameAt(index, &nameLen);
if (!name || nameLen == 0) // bad data: skip it gracefully
continue;
// fill in the entry name -- checks whether the
// entry fits into the buffer
error = set_dirent_name(buffer, bufferSize, name,
nameLen);
if (error == B_OK) {
// fill in the other data
buffer->d_dev = volume->GetID();
buffer->d_ino = VNode::GetIDFor(dirID, objectID);
*count = 1;
PRINT(("Successfully read entry: dir: (%Ld: %ld, %ld), name: `%s', "
"id: (%Ld, %ld, %ld), reclen: %hu\n", node->GetID(), node->GetDirID(),
node->GetObjectID(), buffer->d_name, buffer->d_ino, dirID, objectID,
buffer->d_reclen));
if (!strcmp("..", buffer->d_name))
iterator->SetEncounteredDotDot(true);
done = true;
}
}
}
if (error == B_ENTRY_NOT_FOUND) {
if (iterator->EncounteredDotDot()) {
error = B_OK;
*count = 0;
} else {
// this is necessary for the root directory
// it usually has no ".." entry, so we simulate one
// get the name
const char *name = "..";
size_t nameLen = strlen(name);
// fill in the entry name -- checks whether the
// entry fits into the buffer
error = set_dirent_name(buffer, bufferSize, name,
nameLen);
if (error == B_OK) {
// fill in the other data
buffer->d_dev = volume->GetID();
buffer->d_ino = node->GetID();
// < That's not correct!
*count = 1;
PRINT(("faking `..' entry: dir: (%Ld: %ld, %ld), name: `%s', "
"id: (%Ld, %ld, %ld), reclen: %hu\n", node->GetID(), node->GetDirID(),
node->GetObjectID(), buffer->d_name, buffer->d_ino, node->GetDirID(),
node->GetObjectID(), buffer->d_reclen));
iterator->SetEncounteredDotDot(true);
}
}
}
iterator->Suspend();
}
PRINT(("returning %ld entries\n", *count));
RETURN_ERROR(error);
}
