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Kernel: Add Inode::read_until_filled_or_end

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The existing `read_entire` is quite slow due to allocating and copying
multiple times, but it is simultaneously quite hard to get rid of in a
single step. As a replacement, add a new function that reads as much as
possible directly into a user-provided buffer.
This commit is contained in:
Tim Schumacher 2023-04-16 18:48:38 +02:00 • committed by Linus Groh
parent c403f8e92c
commit acd8c8dba4
2 changed files with 16 additions and 0 deletions
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15
Kernel/FileSystem/Inode.cpp
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@ -118,6 +118,21 @@ ErrorOr<size_t> Inode::read_bytes(off_t offset, size_t length, UserOrKernelBuffe
return read_bytes_locked(offset, length, buffer, open_description);
}
ErrorOr<size_t> Inode::read_until_filled_or_end(off_t offset, size_t length, UserOrKernelBuffer buffer, OpenFileDescription* open_description) const
{
auto remaining_length = length;
while (remaining_length > 0) {
auto filled_bytes = TRY(read_bytes(offset, remaining_length, buffer, open_description));
if (filled_bytes == 0)
break;
offset += filled_bytes;
remaining_length -= filled_bytes;
}
return length - remaining_length;
}
ErrorOr<void> Inode::update_timestamps([[maybe_unused]] Optional<Time> atime, [[maybe_unused]] Optional<Time> ctime, [[maybe_unused]] Optional<Time> mtime)
{
return ENOTIMPL;