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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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4
kernel/tty/tty.c
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@@ -73,7 +73,7 @@ static void putchar(struct device *tty, int c)
}
}
kern_status_t tty_read(struct device *tty, void *buf, size_t max, size_t *nr_read, socks_flags_t flags)
kern_status_t tty_read(struct device *tty, void *buf, size_t offset, size_t max, size_t *nr_read, socks_flags_t flags)
{
kern_status_t status = KERN_UNSUPPORTED;
struct tty_device *ttydev = TTY_DEVICE(tty);
@@ -85,7 +85,7 @@ kern_status_t tty_read(struct device *tty, void *buf, size_t max, size_t *nr_rea
return status;
}
kern_status_t tty_write(struct device *tty, const void *buf, size_t len, size_t *nr_written, socks_flags_t flags)
kern_status_t tty_write(struct device *tty, const void *buf, size_t offset, size_t len, size_t *nr_written, socks_flags_t flags)
{
size_t r = 0;
const char *s = buf;