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author | dzwdz | 2021-09-04 19:34:51 +0200 |
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committer | dzwdz | 2021-09-04 19:34:51 +0200 |
commit | 613de4db61dd99e7d2049b0a303e167fa711030b (patch) | |
tree | 84b577c30aac3ac7f8360fcc7aa78f7d29479538 /src/kernel/vfs/backend.c | |
parent | c4531fa5e1aa16b7ba74de2975eadf06b3052b78 (diff) |
new vfs impl pt. 1: implement open()
Diffstat (limited to 'src/kernel/vfs/backend.c')
-rw-r--r-- | src/kernel/vfs/backend.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/kernel/vfs/backend.c b/src/kernel/vfs/backend.c new file mode 100644 index 0000000..cf73ef0 --- /dev/null +++ b/src/kernel/vfs/backend.c @@ -0,0 +1,42 @@ +#include <kernel/panic.h> +#include <kernel/proc.h> +#include <kernel/vfs/backend.h> +#include <kernel/vfs/root.h> + +// dispatches a VFS operation to the correct process +_Noreturn void vfs_backend_dispatch(struct vfs_backend *backend, struct vfs_op op) { + struct vfs_op_request req = { + .op = op, + .caller = process_current, + }; + switch (backend->type) { + case VFS_BACK_ROOT: + int ret = vfs_root_handler(&req); + vfs_backend_finish(&req, ret); + default: + panic(); + } +} + +// returns from a VFS operation to the calling process +_Noreturn void vfs_backend_finish(struct vfs_op_request *req, int ret) { + if (req->op.type == VFSOP_OPEN && ret >= 0) { + // open() calls need special handling + // we need to wrap the id returned by the VFS in a handle passed to + // the client + handle_t handle = process_find_handle(req->caller); + if (handle < 0) panic(); + req->caller->handles[handle] = (struct handle){ + .type = HANDLE_FILE, + .file = { + .backend = req->backend, + .id = ret, + }, + }; + ret = handle; + } + + req->caller->state = PS_RUNNING; + regs_savereturn(&req->caller->regs, ret); + process_switch(req->caller); +} |