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Kernel: Make UserOrKernelBuffer R/W helpers return KResultOr<size_t>

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This makes error propagation less cumbersome (and also exposed some
places where we were not doing it.)
This commit is contained in:
Andreas Kling 2021-05-13 09:08:44 +02:00
parent 25a45e639a
commit e46343bf9a
15 changed files with 64 additions and 85 deletions
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8
Kernel/FileSystem/InodeWatcher.cpp
View file

@ -48,7 +48,7 @@ KResultOr<size_t> InodeWatcher::read(FileDescription&, u64, UserOrKernelBuffer&
if (buffer_size < bytes_to_write)
return EINVAL;
ssize_t nwritten = buffer.write_buffered<MAXIMUM_EVENT_SIZE>(bytes_to_write, [&](u8* data, size_t data_bytes) {
auto result = buffer.write_buffered<MAXIMUM_EVENT_SIZE>(bytes_to_write, [&](u8* data, size_t data_bytes) {
size_t offset = 0;
memcpy(data + offset, &event.wd, sizeof(InodeWatcherEvent::watch_descriptor));
@ -64,12 +64,10 @@ KResultOr<size_t> InodeWatcher::read(FileDescription&, u64, UserOrKernelBuffer&
memset(data + offset, 0, sizeof(InodeWatcherEvent::name_length));
}
return (ssize_t)data_bytes;
return data_bytes;
});
if (nwritten < 0)
return KResult((ErrnoCode)-nwritten);
evaluate_block_conditions();
return bytes_to_write;
return result;
}
KResult InodeWatcher::close()

10
Kernel/FileSystem/ProcFS.cpp
View file

@ -903,17 +903,17 @@ static ssize_t write_sys_bool(InodeIdentifier inode_id, const UserOrKernelBuffer
char value = 0;
bool did_read = false;
ssize_t nread = buffer.read_buffered<1>(1, [&](const u8* data, size_t) {
auto result = buffer.read_buffered<1>(1, [&](u8 const* data, size_t) {
if (did_read)
return 0;
value = (char)data[0];
did_read = true;
return 1;
});
if (nread < 0)
return nread;
VERIFY(nread == 0 || (nread == 1 && did_read));
if (nread == 0 || !(value == '0' || value == '1'))
if (result.is_error())
return result.error();
VERIFY(result.value() == 0 || (result.value() == 1 && did_read));
if (result.value() == 0 || !(value == '0' || value == '1'))
return (ssize_t)size;
auto* lockable_bool = reinterpret_cast<Lockable<bool>*>(variable.address);