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[6s] Allow 6s to know about filesystems

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Added a j6_proto_vfs_tag/_get_tag pair of messages to the VFS protocol
to allow filesystems to label themselves, and gave 6s the concept of
current fs and current working directory.
This commit is contained in:
Justin C. Miller
2024-04-30 22:23:04 -07:00
parent 29332cbd45
commit eb62588b79
10 changed files with 195 additions and 43 deletions
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13
src/user/srv.init/initfs.cpp
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@@ -1,6 +1,7 @@
#include <stdint.h>
#include <j6/flags.h>
#include <j6/errors.h>
#include <j6/memutils.h>
#include <j6/protocols/vfs.h>
#include <j6/syscalls.h>
#include <j6/syslog.hh>
@@ -11,6 +12,9 @@
static uint64_t initfs_running = 1;
static constexpr size_t buffer_size = 2048;
static char fs_tag[] = "init";
static constexpr size_t fs_tag_len = sizeof(fs_tag) - 1;
j6_status_t
handle_load_request(j6romfs::fs &fs, const char *path, j6_handle_t &vma)
{
@@ -82,6 +86,14 @@ initfs_start(j6romfs::fs &fs, j6_handle_t mb)
tag = j6_proto_vfs_file;
break;
case j6_proto_vfs_get_tag:
out_len = fs_tag_len;
handles_count = 0;
tag = j6_proto_vfs_tag;
memcpy(buffer, fs_tag, fs_tag_len);
break;
default:
tag = j6_proto_base_status;
*reinterpret_cast<j6_status_t*>(buffer) = j6_err_invalid_arg;
@@ -90,7 +102,6 @@ initfs_start(j6romfs::fs &fs, j6_handle_t mb)
handles_count = 0;
}
out_len = buffer_size;
s = j6_mailbox_respond(mb, &tag,
buffer, &out_len, buffer_size,
&give_handle, &handles_count, max_handles,