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obscure File_system::Out_of_node_handles exception

Browse Source 
Replace the Out_of_node_handles exception with Out_of_metadata.
Clients need to know when the server is out of internal resources,
but not why.

Cleanup and sort the errors at file_system_session.h.
Remove 'Size_limit_reached exception' from File_system, which was
internal to ram_fs.

Issue #1751
Fixes #1909
This commit is contained in:
Emery Hemingway 2016-03-17 15:09:07 +01:00 committed by Christian Helmuth
parent 58632ab8b5
commit cb952d2087
14 changed files with 109 additions and 95 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
repos/dde_rump/src/server/rump_fs/main.cc
View File

@ -94,7 +94,6 @@ class File_system::Session_component : public Session_rpc_object
_process_packet_op(packet, *node);
}
catch (Invalid_handle) { PERR("Invalid_handle"); }
catch (Size_limit_reached) { PERR("Size_limit_reached"); }
/*
* The 'acknowledge_packet' function cannot block because we

1
repos/libports/src/server/ffat_fs/main.cc
View File

@ -120,7 +120,6 @@ namespace File_system {
_process_packet_op(packet, *node);
}
catch (Invalid_handle) { PERR("Invalid_handle"); }
catch (Size_limit_reached) { PERR("Size_limit_reached"); }
/*
* The 'acknowledge_packet' function cannot block because we

1
repos/libports/src/server/fuse_fs/fuse_fs_main.cc
View File

@ -108,7 +108,6 @@ class File_system::Session_component : public Session_rpc_object
_process_packet_op(packet, *node);
}
catch (Invalid_handle) { PERR("Invalid_handle"); }
catch (Size_limit_reached) { PERR("Size_limit_reached"); }
/*
* The 'acknowledge_packet' function cannot block because we

4
repos/os/include/file_system/node_handle_registry.h
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@ -56,7 +56,7 @@ namespace File_system {
/**
* Allocate node handle
*
* \throw Out_of_node_handles
* \throw Out_of_metadata
*/
int _alloc(Node_base *node)
{
@ -68,7 +68,7 @@ namespace File_system {
return i;
}
throw Out_of_node_handles();
throw Out_of_metadata();
}
bool _in_range(int handle) const

108
repos/os/include/file_system_session/file_system_session.h
View File

@ -5,7 +5,7 @@
*/
/*
* Copyright (C) 2012-2013 Genode Labs GmbH
* Copyright (C) 2012-2016 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
@ -51,16 +51,15 @@ namespace File_system {
* Exception types
*/
class Exception : public Genode::Exception { };
class Permission_denied : Exception { };
class Node_already_exists : Exception { };
class Lookup_failed : Exception { };
class Name_too_long : Exception { };
class No_space : Exception { };
class Out_of_node_handles : Exception { };
class Invalid_handle : Exception { };
class Invalid_name : Exception { };
class Size_limit_reached : Exception { };
class Lookup_failed : Exception { };
class Name_too_long : Exception { };
class Node_already_exists : Exception { };
class No_space : Exception { };
class Not_empty : Exception { };
class Out_of_metadata : Exception { };
class Permission_denied : Exception { };
struct Session;
}
@ -214,13 +213,13 @@ struct File_system::Session : public Genode::Session
* Open or create file
*
* \throw Invalid_handle directory handle is invalid
* \throw Node_already_exists file cannot be created because a
* node with the same name already exists
* \throw Invalid_name file name contains invalid characters
* \throw Lookup_failed the name refers to a node other than a
* file
* \throw Out_of_node_handles server cannot allocate metadata
* \throw No_space
* \throw Lookup_failed the name refers to a node other than a file
* \throw Node_already_exists file cannot be created because a node with
* the same name already exists
* \throw No_space storage exhausted
* \throw Out_of_metadata server cannot allocate metadata
* \throw Permission_denied
*/
virtual File_handle file(Dir_handle, Name const &name, Mode, bool create) = 0;
@ -228,23 +227,27 @@ struct File_system::Session : public Genode::Session
* Open or create symlink
*
* \throw Invalid_handle directory handle is invalid
* \throw Invalid_name file name contains invalid characters
* \throw Out_of_node_handles server cannot allocate metadata
* \throw No_space
* \throw Invalid_name symlink name contains invalid characters
* \throw Lookup_failed the name refers to a node other than a symlink
* \throw Node_already_exists symlink cannot be created because a node with
* the same name already exists
* \throw No_space storage exhausted
* \throw Out_of_metadata server cannot allocate metadata
* \throw Permission_denied
*/
virtual Symlink_handle symlink(Dir_handle, Name const &name, bool create) = 0;
/**
* Open or create directory
*
* \throw Permission_denied
* \throw Node_already_exists directory cannot be created because a
* node with the same name already exists
* \throw Lookup_failed path lookup failed because one element
* of 'path' does not exist
* \throw Name_too_long
* \throw Out_of_node_handles server cannot allocate metadata
* \throw No_space
* \throw Name_too_long 'path' is too long
* \throw Node_already_exists directory cannot be created because a
* node with the same name already exists
* \throw No_space storage exhausted
* \throw Out_of_metadata server cannot allocate metadata
* \throw Permission_denied
*/
virtual Dir_handle dir(Path const &path, bool create) = 0;
@ -254,9 +257,9 @@ struct File_system::Session : public Genode::Session
* The returned node handle can be used merely as argument for
* 'status'.
*
* \throw Lookup_failed path lookup failed because one element
* of 'path' does not exist
* \throw Out_of_node_handles server cannot allocate metadata
* \throw Lookup_failed path lookup failed because one element
* of 'path' does not exist
* \throw Out_of_metadata server cannot allocate metadata
*/
virtual Node_handle node(Path const &path) = 0;
@ -278,25 +281,31 @@ struct File_system::Session : public Genode::Session
/**
* Delete file or directory
*
* \throw Invalid_handle directory handle is invalid
* \throw Invalid_name 'name' contains invalid characters
* \throw Lookup_failed lookup of 'name' in 'dir' failed
* \throw Not_empty argument is a non-empty directory and
* the backend does not support recursion
* \throw Permission_denied
* \throw Invalid_name
* \throw Lookup_failed
* \throw Not_empty argument is a non-empty directory and
* the backend does not support recursion
*/
virtual void unlink(Dir_handle, Name const &) = 0;
virtual void unlink(Dir_handle dir, Name const &name) = 0;
/**
* Truncate or grow file to specified size
*
* \throw Permission_denied node modification not allowed
* \throw Invalid_handle node handle is invalid
* \throw No_space new size exceeds free space
* \throw Permission_denied node modification not allowed
*/
virtual void truncate(File_handle, file_size_t size) = 0;
/**
* Move and rename directory entry
*
* \throw Invalid_handle a directory handle is invalid
* \throw Invalid_name 'to' contains invalid characters
* \throw Lookup_failed 'from' not found
* \throw Permission_denied node modification not allowed
*/
virtual void move(Dir_handle, Name const &from,
Dir_handle, Name const &to) = 0;
@ -321,37 +330,40 @@ struct File_system::Session : public Genode::Session
GENODE_RPC(Rpc_tx_cap, Genode::Capability<Tx>, _tx_cap);
GENODE_RPC_THROW(Rpc_file, File_handle, file,
GENODE_TYPE_LIST(Invalid_handle, Node_already_exists,
Invalid_name, Lookup_failed,
Permission_denied, No_space,
Out_of_node_handles),
GENODE_TYPE_LIST(Invalid_handle, Invalid_name,
Lookup_failed, Node_already_exists,
No_space, Out_of_metadata,
Permission_denied),
Dir_handle, Name const &, Mode, bool);
GENODE_RPC_THROW(Rpc_symlink, Symlink_handle, symlink,
GENODE_TYPE_LIST(Invalid_handle, Node_already_exists,
Invalid_name, Lookup_failed,
Permission_denied, No_space,
Out_of_node_handles),
GENODE_TYPE_LIST(Invalid_handle, Invalid_name,
Lookup_failed, Node_already_exists,
No_space, Out_of_metadata,
Permission_denied),
Dir_handle, Name const &, bool);
GENODE_RPC_THROW(Rpc_dir, Dir_handle, dir,
GENODE_TYPE_LIST(Permission_denied, Node_already_exists,
Lookup_failed, Name_too_long,
No_space, Out_of_node_handles),
GENODE_TYPE_LIST(Lookup_failed, Name_too_long,
Node_already_exists, No_space,
Out_of_metadata, Permission_denied),
Path const &, bool);
GENODE_RPC_THROW(Rpc_node, Node_handle, node,
GENODE_TYPE_LIST(Lookup_failed, Out_of_node_handles),
GENODE_TYPE_LIST(Lookup_failed, Out_of_metadata),
Path const &);
GENODE_RPC(Rpc_close, void, close, Node_handle);
GENODE_RPC(Rpc_status, Status, status, Node_handle);
GENODE_RPC(Rpc_control, void, control, Node_handle, Control);
GENODE_RPC_THROW(Rpc_unlink, void, unlink,
GENODE_TYPE_LIST(Permission_denied, Invalid_name,
Lookup_failed, Not_empty),
GENODE_TYPE_LIST(Invalid_handle, Invalid_name,
Lookup_failed, Not_empty,
Permission_denied),
Dir_handle, Name const &);
GENODE_RPC_THROW(Rpc_truncate, void, truncate,
GENODE_TYPE_LIST(Permission_denied, Invalid_handle, No_space),
GENODE_TYPE_LIST(Invalid_handle, No_space,
Permission_denied),
File_handle, file_size_t);
GENODE_RPC_THROW(Rpc_move, void, move,
GENODE_TYPE_LIST(Permission_denied, Invalid_name, Lookup_failed),
GENODE_TYPE_LIST(Invalid_handle, Invalid_name,
Lookup_failed, Permission_denied),
Dir_handle, Name const &, Dir_handle, Name const &);
GENODE_RPC_THROW(Rpc_sigh, void, sigh,
GENODE_TYPE_LIST(Invalid_handle),

6
repos/os/include/ram_fs/file.h
View File

@ -81,8 +81,10 @@ class File_system::File : public Node
if (seek_offset == (seek_off_t)(~0))
seek_offset = _chunk.used_size();
if (seek_offset + len >= Chunk_level_0::SIZE)
throw Size_limit_reached();
if (seek_offset + len >= Chunk_level_0::SIZE) {
len = (Chunk_level_0::SIZE-1) - seek_offset;
PERR("%s: size limit %d reached", name(), Chunk_level_0::SIZE);
}
_chunk.write(src, len, (size_t)seek_offset);

65
repos/os/include/vfs/fs_file_system.h
View File

@ -247,11 +247,9 @@ class Vfs::Fs_file_system : public File_system
::File_system::Node_handle node = _fs.node(path);
Fs_handle_guard node_guard(_fs, node);
status = _fs.status(node);
} catch (...) {
if (verbose)
PDBG("stat failed for path '%s'", path);
return STAT_ERR_NO_ENTRY;
}
catch (::File_system::Lookup_failed) { return STAT_ERR_NO_ENTRY; }
catch (::File_system::Out_of_metadata) { return STAT_ERR_NO_PERM; }
memset(&out, 0, sizeof(out));
@ -266,6 +264,8 @@ class Vfs::Fs_file_system : public File_system
out.uid = 0;
out.gid = 0;
out.inode = status.inode;
out.device = (Genode::addr_t)this;
return STAT_OK;
}
@ -278,7 +278,11 @@ class Vfs::Fs_file_system : public File_system
if (strcmp(path, "") == 0)
path = "/";
::File_system::Dir_handle dir_handle = _fs.dir(path, false);
::File_system::Dir_handle dir_handle;
try { dir_handle = _fs.dir(path, false); }
catch (::File_system::Lookup_failed) { return DIRENT_ERR_INVALID_PATH; }
catch (::File_system::Name_too_long) { return DIRENT_ERR_INVALID_PATH; }
catch (...) { return DIRENT_ERR_NO_PERM; }
Fs_handle_guard dir_guard(_fs, dir_handle);
enum { DIRENT_SIZE = sizeof(::File_system::Directory_entry) };
@ -318,9 +322,8 @@ class Vfs::Fs_file_system : public File_system
case Directory_entry::TYPE_SYMLINK: type = DIRENT_TYPE_SYMLINK; break;
}
out.fileno = entry->inode;
out.type = type;
out.fileno = index + 1;
strncpy(out.name, entry->name, sizeof(out.name));
source.release_packet(packet);
@ -343,9 +346,11 @@ class Vfs::Fs_file_system : public File_system
_fs.unlink(dir, file_name.base() + 1);
}
catch (::File_system::Permission_denied) { return UNLINK_ERR_NO_PERM; }
catch (::File_system::Invalid_handle) { return UNLINK_ERR_NO_ENTRY; }
catch (::File_system::Invalid_name) { return UNLINK_ERR_NO_ENTRY; }
catch (::File_system::Lookup_failed) { return UNLINK_ERR_NO_ENTRY; }
catch (::File_system::Not_empty) { return UNLINK_ERR_NOT_EMPTY; }
catch (...) { return UNLINK_ERR_NO_ENTRY; }
catch (::File_system::Permission_denied) { return UNLINK_ERR_NO_PERM; }
return UNLINK_OK;
}
@ -374,9 +379,10 @@ class Vfs::Fs_file_system : public File_system
out_len = _read(symlink_handle, buf, buf_size, 0);
return READLINK_OK;
} catch (...) { }
return READLINK_ERR_NO_ENTRY;
}
catch (::File_system::Lookup_failed) { return READLINK_ERR_NO_ENTRY; }
catch (::File_system::Invalid_handle) { return READLINK_ERR_NO_ENTRY; }
catch (...) { return READLINK_ERR_NO_PERM; }
}
Rename_result rename(char const *from_path, char const *to_path) override
@ -428,7 +434,7 @@ class Vfs::Fs_file_system : public File_system
catch (::File_system::Lookup_failed) { return MKDIR_ERR_NO_ENTRY; }
catch (::File_system::Name_too_long) { return MKDIR_ERR_NAME_TOO_LONG; }
catch (::File_system::No_space) { return MKDIR_ERR_NO_SPACE; }
catch (::File_system::Out_of_node_handles) { return MKDIR_ERR_NO_ENTRY; }
catch (::File_system::Out_of_metadata) { return MKDIR_ERR_NO_ENTRY; }
return MKDIR_OK;
}
@ -467,7 +473,7 @@ class Vfs::Fs_file_system : public File_system
catch (::File_system::Lookup_failed) { return SYMLINK_ERR_NO_ENTRY; }
catch (::File_system::Permission_denied) { return SYMLINK_ERR_NO_PERM; }
catch (::File_system::No_space) { return SYMLINK_ERR_NO_SPACE; }
catch (::File_system::Out_of_node_handles) { return SYMLINK_ERR_NO_ENTRY; }
catch (::File_system::Out_of_metadata) { return SYMLINK_ERR_NO_ENTRY; }
return SYMLINK_OK;
}
@ -477,12 +483,8 @@ class Vfs::Fs_file_system : public File_system
if (strcmp(path, "") == 0)
path = "/";
/*
* XXX handle more exceptions
*/
::File_system::Node_handle node;
try { node = _fs.node(path); } catch (::File_system::Lookup_failed) { return 0; }
try { node = _fs.node(path); } catch (...) { return 0; }
Fs_handle_guard node_guard(_fs, node);
::File_system::Status status = _fs.status(node);
@ -550,26 +552,29 @@ class Vfs::Fs_file_system : public File_system
*out_handle = new (alloc) Fs_vfs_handle(*this, alloc, vfs_mode, file);
}
catch (::File_system::Permission_denied) { return OPEN_ERR_NO_PERM; }
catch (::File_system::Invalid_handle) { return OPEN_ERR_NO_PERM; }
catch (::File_system::Lookup_failed) { return OPEN_ERR_UNACCESSIBLE; }
catch (::File_system::Node_already_exists) { return OPEN_ERR_EXISTS; }
catch (::File_system::Lookup_failed) { return OPEN_ERR_UNACCESSIBLE; }
catch (::File_system::Permission_denied) { return OPEN_ERR_NO_PERM; }
catch (::File_system::Invalid_handle) { return OPEN_ERR_UNACCESSIBLE; }
catch (::File_system::Node_already_exists) { return OPEN_ERR_EXISTS; }
catch (::File_system::Invalid_name) { return OPEN_ERR_NAME_TOO_LONG; }
catch (::File_system::No_space) { return OPEN_ERR_NO_SPACE; }
catch (::File_system::Out_of_node_handles) { return OPEN_ERR_UNACCESSIBLE; }
catch (::File_system::Name_too_long) { return OPEN_ERR_NAME_TOO_LONG; }
catch (::File_system::No_space) { return OPEN_ERR_NO_SPACE; }
catch (::File_system::Out_of_metadata) { return OPEN_ERR_NO_PERM; }
return OPEN_OK;
}
void close(Vfs_handle *vfs_handle) override
{
if (!vfs_handle) return;
Lock::Guard guard(_lock);
Fs_vfs_handle *handle = static_cast<Fs_vfs_handle *>(vfs_handle);
Fs_vfs_handle *fs_handle = static_cast<Fs_vfs_handle *>(vfs_handle);
if (handle) {
_fs.close(handle->file_handle());
destroy(handle->alloc(), handle);
if (fs_handle) {
_fs.close(fs_handle->file_handle());
destroy(fs_handle->alloc(), fs_handle);
}
}
@ -584,8 +589,8 @@ class Vfs::Fs_file_system : public File_system
{
try {
::File_system::Node_handle node = _fs.node(path);
Fs_handle_guard node_guard(_fs, node);
_fs.sync(node);
_fs.close(node);
} catch (...) { }
}

4
repos/os/src/server/fs_log/main.cc
View File

@ -167,8 +167,8 @@ class Fs_log::Root_component :
} catch (No_space) {
PERR("file system out of space");
} catch (Out_of_node_handles) {
PERR("too many open file handles");
} catch (Out_of_metadata) {
PERR("file system server out of metadata");
} catch (Invalid_name) {
PERR("%s: invalid path", Path(file_name, dir_path).base());

1
repos/os/src/server/lx_fs/main.cc
View File

@ -97,7 +97,6 @@ class File_system::Session_component : public Session_rpc_object
_process_packet_op(packet, *node);
}
catch (Invalid_handle) { PERR("Invalid_handle"); }
catch (Size_limit_reached) { PERR("Size_limit_reached"); }
/*
* The 'acknowledge_packet' function cannot block because we

1
repos/os/src/server/ram_fs/main.cc
View File

@ -95,7 +95,6 @@ namespace File_system {
_process_packet_op(packet, *node);
}
catch (Invalid_handle) { PERR("Invalid_handle"); }
catch (Size_limit_reached) { PERR("Size_limit_reached"); }
/*
* The 'acknowledge_packet' function cannot block because we

1
repos/os/src/server/tar_fs/main.cc
View File

@ -107,7 +107,6 @@ namespace File_system {
_process_packet_op(packet, *node);
}
catch (Invalid_handle) { PERR("Invalid_handle"); }
catch (Size_limit_reached) { PERR("Size_limit_reached"); }
/*
* The 'acknowledge_packet' function cannot block because we

6
repos/os/src/server/trace_fs/file.h
View File

@ -171,8 +171,10 @@ namespace File_system {
if (seek_offset == (seek_off_t)(~0))
seek_offset = _chunk.used_size();
if (seek_offset + len >= Chunk_level_0::SIZE)
throw Size_limit_reached();
if (seek_offset + len >= Chunk_level_0::SIZE) {
len = (Chunk_level_0::SIZE-1) - seek_offset;
PERR("%s: size limit %d reached", name(), Chunk_level_0::SIZE);
}
_chunk.write(src, len, (size_t)seek_offset);

1
repos/os/src/server/trace_fs/main.cc
View File

@ -700,7 +700,6 @@ class File_system::Session_component : public Session_rpc_object
_process_packet_op(packet, *node);
}
catch (Invalid_handle) { PERR("Invalid_handle"); }
catch (Size_limit_reached) { PERR("Size_limit_reached"); }
/*
* The 'acknowledge_packet' function cannot block because we

4
repos/os/src/server/vfs/node_handle_registry.h
View File

@ -67,7 +67,7 @@ namespace File_system {
/**
* Allocate node handle
*
* \throw Out_of_node_handles
* \throw Out_of_metadata
*/
int _alloc(Node *node, Mode mode)
{
@ -80,7 +80,7 @@ namespace File_system {
return i;
}
throw Out_of_node_handles();
throw Out_of_metadata();
}
bool _in_range(int handle) const