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copy: index paranoia

This commit is contained in:
Thomas Schoebel-Theuer 2022-05-19 23:56:57 +02:00
parent e6115c4e76
commit 40651f0646
2 changed files with 37 additions and 9 deletions
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42
kernel/mars_copy.c
View File

@ -222,6 +222,7 @@ void copy_endio(struct generic_callback *cb)
struct copy_state *st;
struct mref_object *old_mref;
unsigned index;
unsigned check_index;
unsigned queue;
int error = 0;
@ -241,8 +242,21 @@ void copy_endio(struct generic_callback *cb)
(!input->check_hint || mref->ref_pos < input->check_hint))
input->check_hint = mref->ref_pos;
queue = mref_a->queue;
index = GET_INDEX(mref->ref_pos);
queue = mref_a->saved_queue;
index = mref_a->saved_index;
/* index paranoia */
check_index = GET_INDEX(mref_a->orig_ref_pos);
if (unlikely(check_index != index)) {
/* This should not happen */
MARS_ERR("index slippery %u != %u on queue=%u: mref=%p mref_a=%p cb=%p err=%d\n",
index, check_index,
queue,
mref, mref_a,
cb, cb->cb_error);
error = -EEXIST;
goto exit;
}
st = &GET_STATE(brick, index);
MARS_IO("queue=%u index=%u pos=%lld state=%d err=%d\n",
@ -262,7 +276,7 @@ void copy_endio(struct generic_callback *cb)
}
old_mref = READ_ONCE(st->table[queue]);
if (unlikely(old_mref != mref)) {
MARS_ERR("table corruption at %u %u (%p => %p) state=%d err=%d\n",
MARS_ERR("table corruption at index=%u queue=%u: %p => %p state=%d err=%d\n",
index, queue,
old_mref, mref,
st->state,
@ -306,8 +320,9 @@ err:
static
int _make_mref(struct copy_brick *brick,
unsigned index,
unsigned queue,
const unsigned index,
/* let the compiler check for 0 <= queue <= 1 */
const bool _queue,
void *data,
loff_t pos, loff_t end_pos,
__u32 flags)
@ -317,6 +332,8 @@ int _make_mref(struct copy_brick *brick,
struct copy_input *input;
struct copy_state *st;
struct mref_object *old_mref;
const unsigned queue = _queue;
unsigned input_index;
unsigned offset;
unsigned len;
int status = -EAGAIN;
@ -362,8 +379,19 @@ int _make_mref(struct copy_brick *brick,
goto done;
}
/* Save some important values for the lifetime of
* of the mref object and the corresponding aspect instance.
*/
/*input = queue ? brick->inputs[INPUT_B] : brick->inputs[INPUT_A];*/
input_index = INPUT_A + (queue * (INPUT_B - INPUT_A));
input = brick->inputs[input_index];
mref_a->input = input;
mref_a->brick = brick;
mref_a->queue = queue;
mref_a->orig_ref_pos = pos;
mref_a->saved_queue = queue;
mref_a->saved_index = index;
/* Compute the start values for the new mref */
mref->ref_flags = flags;
mref->ref_data = data;
mref->ref_pos = pos;
@ -388,8 +416,6 @@ int _make_mref(struct copy_brick *brick,
SETUP_CALLBACK(mref, copy_endio, mref_a);
input = queue ? brick->inputs[INPUT_B] : brick->inputs[INPUT_A];
mref_a->input = input;
status = GENERIC_INPUT_CALL(input, mref_get, mref);
if (unlikely(status < 0)) {
MARS_ERR("mref_get %u status = %d\n",

4
kernel/mars_copy.h
View File

@ -68,7 +68,9 @@ struct copy_mref_aspect {
GENERIC_ASPECT(mref);
struct copy_input *input;
struct copy_brick *brick;
unsigned queue;
loff_t orig_ref_pos;
unsigned saved_queue;
unsigned saved_index;
};
struct copy_brick {