Inline the AIOCTX structure inside the task.

Author: kmeisthax

fs/aio.c

@@ -207,18 +207,17 @@ signed int aioctx_get_pending_event(struct aioctx *ctx, unsigned int index, stru
     return 0;
 }
 
-struct aioctx_table *aioctx_table_new(unsigned int capacity) {
-    struct aioctx_table *tbl = malloc(sizeof(struct aioctx_table));
-    if (tbl == NULL) return NULL;
+signed int aioctx_table_new(struct aioctx_table *tbl, unsigned int capacity) {
+    if (tbl == NULL) return _EINVAL;
 
     tbl->capacity = 0;
     tbl->contexts = NULL;
     lock_init(&tbl->lock);
 
     int err = _aioctx_table_ensure(tbl, capacity);
-    if (err < 0) return ERR_PTR(err);
+    if (err < 0) return err;
 
-    return tbl;
+    return 0;
 }
 
 void aioctx_table_delete(struct aioctx_table *tbl) {

fs/aio.h

@@ -129,7 +129,12 @@ struct aioctx_table {
     struct aioctx **contexts;
 };
 
-struct aioctx_table *aioctx_table_new(unsigned int capacity);
+// In-place construct an AIO context table.
+// 
+// Returns an error value if internal table buffers could not be allocated.
+signed int aioctx_table_new(struct aioctx_table *tbl, unsigned int capacity);
+
+// In-place destroy an AIO context table.
 void aioctx_table_delete(struct aioctx_table *tbl);
 
 // Insert an AIO context into a given table.

kernel/aio.c

@@ -37,7 +37,7 @@ dword_t sys_io_setup(dword_t nr_events, addr_t ctx_idp) {
     if (ctx == NULL) return _ENOMEM;
     if (IS_ERR(ctx)) return PTR_ERR(ctx);
 
-    int ctx_id = aioctx_table_insert(current->aioctx, ctx);
+    int ctx_id = aioctx_table_insert(&current.aioctx, ctx);
     aioctx_release(ctx);
     if (ctx_id < 0) {
         return ctx_id;
@@ -53,7 +53,7 @@ dword_t sys_io_setup(dword_t nr_events, addr_t ctx_idp) {
 dword_t sys_io_destroy(dword_t ctx_id) {
     STRACE("io_destroy(%d)", ctx_id);
 
-    int err = aioctx_table_remove(current->aioctx, ctx_id) < 0;
+    int err = aioctx_table_remove(&current.aioctx, ctx_id) < 0;
     if (err < 0) {
         return err;
     }
@@ -64,7 +64,7 @@ dword_t sys_io_destroy(dword_t ctx_id) {
 dword_t sys_io_getevents(dword_t ctx_id, dword_t min_nr, dword_t nr, addr_t events, addr_t timeout_addr) {
     STRACE("io_getevents(0x%x, %d, %d, 0x%x, 0x%x)", ctx_id, min_nr, nr, events, timeout_addr);
 
-    struct aioctx *ctx = aioctx_table_get_and_retain(current->aioctx, ctx_id);
+    struct aioctx *ctx = aioctx_table_get_and_retain(&current.aioctx, ctx_id);
     if (ctx == NULL) return _EINVAL;
     if (events == 0) return _EFAULT;
 
@@ -115,7 +115,7 @@ dword_t sys_io_submit(dword_t ctx_id, dword_t u_nr, addr_t iocbpp) {
 
     if (nr < 0) return _EINVAL;
 
-    struct aioctx *ctx = aioctx_table_get_and_retain(current->aioctx, ctx_id);
+    struct aioctx *ctx = aioctx_table_get_and_retain(&current.aioctx, ctx_id);
     if (ctx == NULL) return _EINVAL;
 
     sdword_t i;

kernel/fork.c

@@ -123,9 +123,8 @@ static int copy_task(struct task *task, dword_t flags, addr_t stack, addr_t ptid
         task->clear_tid = ctid_addr;
     task->exit_signal = flags & CSIGNAL_;
 
-    task->aioctx = aioctx_table_new(0);
-    if (IS_ERR(task->aioctx)) {
-        err = PTR_ERR(task->aioctx);
+    err = aioctx_table_new(&task->aioctx, 0);
+    if (err < 0) {
         goto fail_free_sighand;
     }
 

kernel/init.c

@@ -72,7 +72,9 @@ static struct task *construct_task(struct task *parent) {
     task_set_mm(task, mm_new());
     task->sighand = sighand_new();
     task->files = fdtable_new(3); // why is there a 3 here
-    task->aioctx = aioctx_table_new(0);
+    
+    signed int err = aioctx_table_new(&task->aioctx, 0);
+    if (err < 0) return ERR_PTR(err);
 
     task->fs = fs_info_new();
     task->fs->umask = 0022;

kernel/task.c

@@ -93,7 +93,7 @@ struct task *task_create_(struct task *parent) {
 void task_destroy(struct task *task) {
     list_remove(&task->siblings);
     pid_get(task->pid)->task = NULL;
-    aioctx_table_delete(task->aioctx);
+    aioctx_table_delete(&task->aioctx);
     free(task);
 }
 

kernel/task.h

@@ -38,7 +38,7 @@ struct task {
     struct fs_info *fs;
 
     // Currently active AIO contexts. Contains internal lock.
-    struct aioctx_table *aioctx;
+    struct aioctx_table aioctx;
 
     // locked by sighand->lock
     struct sighand *sighand;