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dev: implement reading from block devices

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reading from block devices is done using the block cache (bcache).
This cache stores sectors from a block device in pages of memory
marked as 'cached', which will allow them to be reclaimed when
memory pressure is high (TODO).

while block device drivers implement callbacks allowing reading/writing
at block-granularity, the device subsystem uses the block cache to
implement reading/writing at byte-granularity in a driver-agnostic way.

block drivers can disable the block cache for their devices, but this
will require that any clients communicate with the devices at
block-granularity.

also added an offset parameter to device and object read/write functions/callbacks.
This commit is contained in:
max 🍓
2023-07-09 21:58:40 +01:00
parent 53440653f2
commit 3233169f25
14 changed files with 435 additions and 52 deletions
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2
kernel/tty/ldisc.c
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@@ -355,7 +355,7 @@ static void convert_ev_to_chars(struct device *tty, const struct input_event *ev
ringbuffer_write(&ttydev->tty_input, data_len, data, S_NOBLOCK);
size_t nr_written;
tty_write(tty, echo, echo_len, &nr_written, S_NOBLOCK);
tty_write(tty, echo, 0, echo_len, &nr_written, S_NOBLOCK);
}
static kern_status_t canonical_read(struct device *tty, void *buf, size_t max, size_t *nr_read, socks_flags_t flags)