wash/mango
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

dev: implement reading from block devices

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

8
include/socks/object.h
View File

@@ -32,8 +32,8 @@ enum object_type_flags {
struct object_ops {
kern_status_t(*open)(struct object *obj);
kern_status_t(*close)(struct object *obj);
kern_status_t(*read)(struct object *obj, void *p, size_t *r, socks_flags_t flags);
kern_status_t(*write)(struct object *obj, const void *p, size_t *w, socks_flags_t flags);
kern_status_t(*read)(struct object *obj, void *p, size_t off, size_t *r, socks_flags_t flags);
kern_status_t(*write)(struct object *obj, const void *p, size_t off, size_t *w, socks_flags_t flags);
kern_status_t(*destroy)(struct object *obj);
kern_status_t(*query_name)(struct object *obj, char out[OBJECT_NAME_MAX]);
kern_status_t(*parse)(struct object *obj, const char *path, struct object **out);
@@ -92,8 +92,8 @@ static inline kern_status_t object_get(const char *path, struct object **out)
{
return object_namespace_get_object(global_namespace(), path, out);
}
extern kern_status_t object_read(struct object *obj, void *p, size_t max, size_t *nr_read, socks_flags_t flags);
extern kern_status_t object_write(struct object *obj, const void *p, size_t max, size_t *nr_written, socks_flags_t flags);
extern kern_status_t object_read(struct object *obj, void *p, size_t offset, size_t max, size_t *nr_read, socks_flags_t flags);
extern kern_status_t object_write(struct object *obj, const void *p, size_t offset, size_t max, size_t *nr_written, socks_flags_t flags);
extern kern_status_t object_get_child_named(struct object *obj, const char *name, struct object **out);
extern kern_status_t object_get_child_at(struct object *obj, size_t at, struct object **out);
extern kern_status_t object_query_name(struct object *obj, char name[OBJECT_NAME_MAX]);