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VFS ram: remove quota

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Fixes #1780
This commit is contained in:
Emery Hemingway 2015-11-17 16:02:33 +01:00 committed by Christian Helmuth
parent 25643fa00a
commit 6cb0f3bb71
1 changed files with 15 additions and 60 deletions
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65
repos/os/include/vfs/ram_file_system.h
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@ -16,7 +16,6 @@
#include <ram_fs/chunk.h>
#include <vfs/file_system.h>
#include <base/allocator_guard.h>
#include <dataspace/client.h>
#include <util/avl_tree.h>
@ -75,7 +74,7 @@ class Vfs_ram::Node : public Genode::Avl_node<Node>, public Genode::Lock
Node(char const *node_name)
: _inode(_unique_inode()) { name(node_name); }
virtual ~Node() { };
virtual ~Node() { }
unsigned long inode() const { return _inode; }
@ -146,12 +145,12 @@ class Vfs_ram::File : public Vfs_ram::Node
Chunk_level_0 _chunk;
file_size _length;
file_size _length = 0;
public:
File(char const *name, Allocator &alloc)
: Node(name), _chunk(alloc, 0), _length(0) { }
: Node(name), _chunk(alloc, 0) { }
size_t read(char *dst, size_t len, file_size seek_offset)
{
@ -224,11 +223,11 @@ class Vfs_ram::Symlink : public Vfs_ram::Node
private:
char _target[MAX_PATH_LEN];
size_t _len;
size_t _len = 0;
public:
Symlink(char const *name) : Node(name), _len(0) { }
Symlink(char const *name) : Node(name) { }
file_size length() { return _len; }
@ -252,7 +251,7 @@ class Vfs_ram::Directory : public Vfs_ram::Node
private:
Avl_tree<Node> _entries;
file_size _count;
file_size _count = 0;
public:
@ -262,11 +261,6 @@ class Vfs_ram::Directory : public Vfs_ram::Node
{
while (Node *node = _entries.first()) {
_entries.remove(node);
/*
* Not destroying from the allocator guard because
* non-empty directories are only destroyed with
* the rest of the file system.
*/
destroy(env()->heap(), node);
}
}
@ -344,16 +338,9 @@ class Vfs::Ram_file_system : public Vfs::File_system
Vfs_ram::File *file() const { return _file; }
};
Genode::Allocator_guard _alloc;
Genode::Allocator &_alloc;
Vfs_ram::Directory _root;
template<unsigned size>
bool no_space_for()
{
return _alloc.quota() <
(_alloc.consumed() + size + _alloc.overhead(size));
}
Vfs_ram::Node *lookup(char const *path, bool return_parent = false)
{
using namespace Vfs_ram;
@ -401,17 +388,7 @@ class Vfs::Ram_file_system : public Vfs::File_system
public:
Ram_file_system(Xml_node config)
: _alloc(env()->heap(), 0), _root("")
{
try {
Genode::Number_of_bytes ram_bytes = 0;
config.attribute("quota").value(&ram_bytes);
_alloc.upgrade(ram_bytes);
} catch (...) {
_alloc.upgrade(
env()->ram_session()->avail() - 4*1024*sizeof(long));
}
}
: _alloc(*env()->heap()), _root("") { }
/*********************************
** Directory service interface **
@ -456,9 +433,6 @@ class Vfs::Ram_file_system : public Vfs::File_system
if (parent->child(name)) return MKDIR_ERR_EXISTS;
if (no_space_for<sizeof(Directory)>())
return MKDIR_ERR_NO_SPACE;
parent->adopt(new (_alloc) Directory(name));
return MKDIR_OK;
}
@ -480,9 +454,6 @@ class Vfs::Ram_file_system : public Vfs::File_system
if (strlen(name) >= MAX_NAME_LEN)
return OPEN_ERR_NAME_TOO_LONG;
if (no_space_for<sizeof(File)>())
return OPEN_ERR_NO_SPACE;
file = new (_alloc) File(name, _alloc);
parent->adopt(file);
} else {
@ -568,9 +539,6 @@ class Vfs::Ram_file_system : public Vfs::File_system
if (strlen(name) >= MAX_NAME_LEN)
return SYMLINK_ERR_NAME_TOO_LONG;
if (no_space_for<sizeof(Symlink)>())
return SYMLINK_ERR_NO_SPACE;
link = new (_alloc) Symlink(name);
link->lock();
parent->adopt(link);
@ -653,14 +621,8 @@ class Vfs::Ram_file_system : public Vfs::File_system
Node *node = parent->child(basename(path));
if (!node) return UNLINK_ERR_NO_ENTRY;
node->lock();
Directory *dir = dynamic_cast<Directory *>(node);
if (dir && dir->length()) {
node->unlock();
return UNLINK_ERR_NO_PERM;
}
parent->release(node);
destroy(_alloc, node);
return UNLINK_OK;
@ -683,7 +645,6 @@ class Vfs::Ram_file_system : public Vfs::File_system
char *local_addr = nullptr;
try {
_alloc.withdraw(len);
ds_cap = env()->ram_session()->alloc(len);
local_addr = env()->rm_session()->attach(ds_cap);
@ -693,7 +654,6 @@ class Vfs::Ram_file_system : public Vfs::File_system
} catch(...) {
env()->rm_session()->detach(local_addr);
env()->ram_session()->free(ds_cap);
_alloc.upgrade(len);
return Dataspace_capability();
}
return ds_cap;
@ -718,10 +678,9 @@ class Vfs::Ram_file_system : public Vfs::File_system
Ram_vfs_handle const *handle =
static_cast<Ram_vfs_handle *>(vfs_handle);
try {
Vfs_ram::Node::Guard guard(handle->file());
out = handle->file()->write(buf, len, handle->seek());
} catch (Genode::Allocator::Out_of_memory) { }
return WRITE_OK;
}
@ -749,12 +708,8 @@ class Vfs::Ram_file_system : public Vfs::File_system
Ram_vfs_handle const *handle =
static_cast<Ram_vfs_handle *>(vfs_handle);
try {
Vfs_ram::Node::Guard guard(handle->file());
handle->file()->truncate(len);
} catch (Genode::Allocator::Out_of_memory) {
return FTRUNCATE_ERR_NO_SPACE;
}
return FTRUNCATE_OK;
}