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Kernel/Ext2: Only handle extended attributes when they are supported

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implicitfield 2024-01-03 17:06:11 +04:00 committed by Ali Mohammad Pur
parent 280d5feac9
commit 48e848a9fd
Notes: sideshowbarker 2024-07-17 05:18:58 +09:00 
Author: https://github.com/implicitfield
Commit: https://github.com/SerenityOS/serenity/commit/48e848a9fd
Pull-request: https://github.com/SerenityOS/serenity/pull/22552
Issue: https://github.com/SerenityOS/serenity/issues/22533
Reviewed-by: https://github.com/alimpfard
1 changed files with 13 additions and 6 deletions
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19
Kernel/FileSystem/Ext2FS/Inode.cpp
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@ -8,6 +8,7 @@
#include <AK/MemoryStream.h>
#include <Kernel/API/POSIX/errno.h>
#include <Kernel/Debug.h>
#include <Kernel/FileSystem/Ext2FS/FileSystem.h>
#include <Kernel/FileSystem/Ext2FS/Inode.h>
#include <Kernel/FileSystem/InodeMetadata.h>
#include <Kernel/UnixTypes.h>
@ -740,6 +741,8 @@ ErrorOr<void> Ext2FSInode::traverse_as_directory(Function<ErrorOr<void>(FileSyst
auto block_size = fs().logical_block_size();
auto file_size = size();
bool has_file_type_attribute = has_flag(fs().get_features_optional(), Ext2FS::FeaturesOptional::ExtendedAttributes);
// Directory entries are guaranteed not to span multiple blocks,
// so we can iterate over blocks separately.
@ -752,7 +755,7 @@ ErrorOr<void> Ext2FSInode::traverse_as_directory(Function<ErrorOr<void>(FileSyst
while (entry < entries_end) {
if (entry->inode != 0) {
dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]::traverse_as_directory(): inode {}, name_len: {}, rec_len: {}, file_type: {}, name: {}", identifier(), entry->inode, entry->name_len, entry->rec_len, entry->file_type, StringView(entry->name, entry->name_len));
TRY(callback({ { entry->name, entry->name_len }, { fsid(), entry->inode }, entry->file_type }));
TRY(callback({ { entry->name, entry->name_len }, { fsid(), entry->inode }, has_file_type_attribute ? entry->file_type : (u8)EXT2_FT_UNKNOWN }));
}
entry = (ext2_extended_dir_entry*)((char*)entry + entry->rec_len);
}
@ -792,6 +795,7 @@ ErrorOr<void> Ext2FSInode::write_directory(Vector<Ext2FSDirectoryEntry>& entries
auto directory_data = TRY(ByteBuffer::create_uninitialized(directory_size));
FixedMemoryStream stream { directory_data.bytes() };
bool has_file_type_attribute = has_flag(fs().get_features_optional(), Ext2FS::FeaturesOptional::ExtendedAttributes);
for (auto& entry : entries) {
dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]::write_directory(): Writing inode: {}, name_len: {}, rec_len: {}, file_type: {}, name: {}", identifier(), entry.inode_index, u16(entry.name->length()), u16(entry.record_length), u8(entry.file_type), entry.name);
@ -799,7 +803,7 @@ ErrorOr<void> Ext2FSInode::write_directory(Vector<Ext2FSDirectoryEntry>& entries
MUST(stream.write_value<u32>(entry.inode_index.value()));
MUST(stream.write_value<u16>(entry.record_length));
MUST(stream.write_value<u8>(entry.name->length()));
MUST(stream.write_value<u8>(entry.file_type));
MUST(stream.write_value<u8>(has_file_type_attribute ? entry.file_type : EXT2_FT_UNKNOWN));
MUST(stream.write_until_depleted(entry.name->bytes()));
int padding = entry.record_length - entry.name->length() - 8;
for (int j = 0; j < padding; ++j)
@ -835,20 +839,21 @@ ErrorOr<void> Ext2FSInode::add_child(Inode& child, StringView name, mode_t mode)
return ENAMETOOLONG;
dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]::add_child(): Adding inode {} with name '{}' and mode {:o} to directory {}", identifier(), child.index(), name, mode, index());
bool has_file_type_attribute = has_flag(fs().get_features_optional(), Ext2FS::FeaturesOptional::ExtendedAttributes);
Vector<Ext2FSDirectoryEntry> entries;
TRY(traverse_as_directory([&](auto& entry) -> ErrorOr<void> {
if (name == entry.name)
return EEXIST;
auto entry_name = TRY(KString::try_create(entry.name));
TRY(entries.try_append({ move(entry_name), entry.inode.index(), entry.file_type }));
TRY(entries.try_append({ move(entry_name), entry.inode.index(), has_file_type_attribute ? entry.file_type : (u8)EXT2_FT_UNKNOWN }));
return {};
}));
TRY(child.increment_link_count());
auto entry_name = TRY(KString::try_create(name));
TRY(entries.try_empend(move(entry_name), child.index(), to_ext2_file_type(mode)));
TRY(entries.try_empend(move(entry_name), child.index(), has_file_type_attribute ? to_ext2_file_type(mode) : (u8)EXT2_FT_UNKNOWN));
TRY(write_directory(entries));
TRY(populate_lookup_cache());
@ -873,12 +878,13 @@ ErrorOr<void> Ext2FSInode::remove_child(StringView name)
auto child_inode_index = (*it).value;
InodeIdentifier child_id { fsid(), child_inode_index };
bool has_file_type_attribute = has_flag(fs().get_features_optional(), Ext2FS::FeaturesOptional::ExtendedAttributes);
Vector<Ext2FSDirectoryEntry> entries;
TRY(traverse_as_directory([&](auto& entry) -> ErrorOr<void> {
if (name != entry.name) {
auto entry_name = TRY(KString::try_create(entry.name));
TRY(entries.try_append({ move(entry_name), entry.inode.index(), entry.file_type }));
TRY(entries.try_append({ move(entry_name), entry.inode.index(), has_file_type_attribute ? entry.file_type : (u8)EXT2_FT_UNKNOWN }));
}
return {};
}));
@ -906,6 +912,7 @@ ErrorOr<void> Ext2FSInode::replace_child(StringView name, Inode& child)
return ENAMETOOLONG;
Vector<Ext2FSDirectoryEntry> entries;
bool has_file_type_attribute = has_flag(fs().get_features_optional(), Ext2FS::FeaturesOptional::ExtendedAttributes);
Optional<InodeIndex> old_child_index;
TRY(traverse_as_directory([&](auto& entry) -> ErrorOr<void> {
@ -913,7 +920,7 @@ ErrorOr<void> Ext2FSInode::replace_child(StringView name, Inode& child)
auto inode_index = is_replacing_this_inode ? child.index() : entry.inode.index();
auto entry_name = TRY(KString::try_create(entry.name));
TRY(entries.try_empend(move(entry_name), inode_index, to_ext2_file_type(child.mode())));
TRY(entries.try_empend(move(entry_name), inode_index, has_file_type_attribute ? to_ext2_file_type(child.mode()) : (u8)EXT2_FT_UNKNOWN));
if (is_replacing_this_inode)
old_child_index = entry.inode.index();