mirror of
https://github.com/torvalds/linux.git
synced 2024-11-23 20:51:44 +00:00
bpf: Factor out cgroup storages operations
Refactor cgroup attach/detach code to abstract away common operations performed on all types of cgroup storages. This makes high-level logic more apparent, plus allows to reuse more code across multiple functions. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200325065746.640559-2-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
Alexei Starovoitov
parent
aa131ed44a
commit
00c4eddf7e
@ -28,6 +28,58 @@ void cgroup_bpf_offline(struct cgroup *cgrp)
|
||||
percpu_ref_kill(&cgrp->bpf.refcnt);
|
||||
}
|
||||
|
||||
static void bpf_cgroup_storages_free(struct bpf_cgroup_storage *storages[])
|
||||
{
|
||||
enum bpf_cgroup_storage_type stype;
|
||||
|
||||
for_each_cgroup_storage_type(stype)
|
||||
bpf_cgroup_storage_free(storages[stype]);
|
||||
}
|
||||
|
||||
static int bpf_cgroup_storages_alloc(struct bpf_cgroup_storage *storages[],
|
||||
struct bpf_prog *prog)
|
||||
{
|
||||
enum bpf_cgroup_storage_type stype;
|
||||
|
||||
for_each_cgroup_storage_type(stype) {
|
||||
storages[stype] = bpf_cgroup_storage_alloc(prog, stype);
|
||||
if (IS_ERR(storages[stype])) {
|
||||
storages[stype] = NULL;
|
||||
bpf_cgroup_storages_free(storages);
|
||||
return -ENOMEM;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void bpf_cgroup_storages_assign(struct bpf_cgroup_storage *dst[],
|
||||
struct bpf_cgroup_storage *src[])
|
||||
{
|
||||
enum bpf_cgroup_storage_type stype;
|
||||
|
||||
for_each_cgroup_storage_type(stype)
|
||||
dst[stype] = src[stype];
|
||||
}
|
||||
|
||||
static void bpf_cgroup_storages_link(struct bpf_cgroup_storage *storages[],
|
||||
struct cgroup* cgrp,
|
||||
enum bpf_attach_type attach_type)
|
||||
{
|
||||
enum bpf_cgroup_storage_type stype;
|
||||
|
||||
for_each_cgroup_storage_type(stype)
|
||||
bpf_cgroup_storage_link(storages[stype], cgrp, attach_type);
|
||||
}
|
||||
|
||||
static void bpf_cgroup_storages_unlink(struct bpf_cgroup_storage *storages[])
|
||||
{
|
||||
enum bpf_cgroup_storage_type stype;
|
||||
|
||||
for_each_cgroup_storage_type(stype)
|
||||
bpf_cgroup_storage_unlink(storages[stype]);
|
||||
}
|
||||
|
||||
/**
|
||||
* cgroup_bpf_release() - put references of all bpf programs and
|
||||
* release all cgroup bpf data
|
||||
@ -37,7 +89,6 @@ static void cgroup_bpf_release(struct work_struct *work)
|
||||
{
|
||||
struct cgroup *p, *cgrp = container_of(work, struct cgroup,
|
||||
bpf.release_work);
|
||||
enum bpf_cgroup_storage_type stype;
|
||||
struct bpf_prog_array *old_array;
|
||||
unsigned int type;
|
||||
|
||||
@ -50,10 +101,8 @@ static void cgroup_bpf_release(struct work_struct *work)
|
||||
list_for_each_entry_safe(pl, tmp, progs, node) {
|
||||
list_del(&pl->node);
|
||||
bpf_prog_put(pl->prog);
|
||||
for_each_cgroup_storage_type(stype) {
|
||||
bpf_cgroup_storage_unlink(pl->storage[stype]);
|
||||
bpf_cgroup_storage_free(pl->storage[stype]);
|
||||
}
|
||||
bpf_cgroup_storages_unlink(pl->storage);
|
||||
bpf_cgroup_storages_free(pl->storage);
|
||||
kfree(pl);
|
||||
static_branch_dec(&cgroup_bpf_enabled_key);
|
||||
}
|
||||
@ -138,7 +187,7 @@ static int compute_effective_progs(struct cgroup *cgrp,
|
||||
enum bpf_attach_type type,
|
||||
struct bpf_prog_array **array)
|
||||
{
|
||||
enum bpf_cgroup_storage_type stype;
|
||||
struct bpf_prog_array_item *item;
|
||||
struct bpf_prog_array *progs;
|
||||
struct bpf_prog_list *pl;
|
||||
struct cgroup *p = cgrp;
|
||||
@ -166,10 +215,10 @@ static int compute_effective_progs(struct cgroup *cgrp,
|
||||
if (!pl->prog)
|
||||
continue;
|
||||
|
||||
progs->items[cnt].prog = pl->prog;
|
||||
for_each_cgroup_storage_type(stype)
|
||||
progs->items[cnt].cgroup_storage[stype] =
|
||||
pl->storage[stype];
|
||||
item = &progs->items[cnt];
|
||||
item->prog = pl->prog;
|
||||
bpf_cgroup_storages_assign(item->cgroup_storage,
|
||||
pl->storage);
|
||||
cnt++;
|
||||
}
|
||||
} while ((p = cgroup_parent(p)));
|
||||
@ -305,7 +354,6 @@ int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
|
||||
struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE],
|
||||
*old_storage[MAX_BPF_CGROUP_STORAGE_TYPE] = {NULL};
|
||||
struct bpf_prog_list *pl, *replace_pl = NULL;
|
||||
enum bpf_cgroup_storage_type stype;
|
||||
int err;
|
||||
|
||||
if (((flags & BPF_F_ALLOW_OVERRIDE) && (flags & BPF_F_ALLOW_MULTI)) ||
|
||||
@ -341,37 +389,25 @@ int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
|
||||
replace_pl = list_first_entry(progs, typeof(*pl), node);
|
||||
}
|
||||
|
||||
for_each_cgroup_storage_type(stype) {
|
||||
storage[stype] = bpf_cgroup_storage_alloc(prog, stype);
|
||||
if (IS_ERR(storage[stype])) {
|
||||
storage[stype] = NULL;
|
||||
for_each_cgroup_storage_type(stype)
|
||||
bpf_cgroup_storage_free(storage[stype]);
|
||||
return -ENOMEM;
|
||||
}
|
||||
}
|
||||
if (bpf_cgroup_storages_alloc(storage, prog))
|
||||
return -ENOMEM;
|
||||
|
||||
if (replace_pl) {
|
||||
pl = replace_pl;
|
||||
old_prog = pl->prog;
|
||||
for_each_cgroup_storage_type(stype) {
|
||||
old_storage[stype] = pl->storage[stype];
|
||||
bpf_cgroup_storage_unlink(old_storage[stype]);
|
||||
}
|
||||
bpf_cgroup_storages_unlink(pl->storage);
|
||||
bpf_cgroup_storages_assign(old_storage, pl->storage);
|
||||
} else {
|
||||
pl = kmalloc(sizeof(*pl), GFP_KERNEL);
|
||||
if (!pl) {
|
||||
for_each_cgroup_storage_type(stype)
|
||||
bpf_cgroup_storage_free(storage[stype]);
|
||||
bpf_cgroup_storages_free(storage);
|
||||
return -ENOMEM;
|
||||
}
|
||||
list_add_tail(&pl->node, progs);
|
||||
}
|
||||
|
||||
pl->prog = prog;
|
||||
for_each_cgroup_storage_type(stype)
|
||||
pl->storage[stype] = storage[stype];
|
||||
|
||||
bpf_cgroup_storages_assign(pl->storage, storage);
|
||||
cgrp->bpf.flags[type] = saved_flags;
|
||||
|
||||
err = update_effective_progs(cgrp, type);
|
||||
@ -379,27 +415,20 @@ int __cgroup_bpf_attach(struct cgroup *cgrp, struct bpf_prog *prog,
|
||||
goto cleanup;
|
||||
|
||||
static_branch_inc(&cgroup_bpf_enabled_key);
|
||||
for_each_cgroup_storage_type(stype) {
|
||||
if (!old_storage[stype])
|
||||
continue;
|
||||
bpf_cgroup_storage_free(old_storage[stype]);
|
||||
}
|
||||
bpf_cgroup_storages_free(old_storage);
|
||||
if (old_prog) {
|
||||
bpf_prog_put(old_prog);
|
||||
static_branch_dec(&cgroup_bpf_enabled_key);
|
||||
}
|
||||
for_each_cgroup_storage_type(stype)
|
||||
bpf_cgroup_storage_link(storage[stype], cgrp, type);
|
||||
bpf_cgroup_storages_link(storage, cgrp, type);
|
||||
return 0;
|
||||
|
||||
cleanup:
|
||||
/* and cleanup the prog list */
|
||||
pl->prog = old_prog;
|
||||
for_each_cgroup_storage_type(stype) {
|
||||
bpf_cgroup_storage_free(pl->storage[stype]);
|
||||
pl->storage[stype] = old_storage[stype];
|
||||
bpf_cgroup_storage_link(old_storage[stype], cgrp, type);
|
||||
}
|
||||
bpf_cgroup_storages_free(pl->storage);
|
||||
bpf_cgroup_storages_assign(pl->storage, old_storage);
|
||||
bpf_cgroup_storages_link(pl->storage, cgrp, type);
|
||||
if (!replace_pl) {
|
||||
list_del(&pl->node);
|
||||
kfree(pl);
|
||||
@ -420,7 +449,6 @@ int __cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
|
||||
enum bpf_attach_type type)
|
||||
{
|
||||
struct list_head *progs = &cgrp->bpf.progs[type];
|
||||
enum bpf_cgroup_storage_type stype;
|
||||
u32 flags = cgrp->bpf.flags[type];
|
||||
struct bpf_prog *old_prog = NULL;
|
||||
struct bpf_prog_list *pl;
|
||||
@ -467,10 +495,8 @@ int __cgroup_bpf_detach(struct cgroup *cgrp, struct bpf_prog *prog,
|
||||
|
||||
/* now can actually delete it from this cgroup list */
|
||||
list_del(&pl->node);
|
||||
for_each_cgroup_storage_type(stype) {
|
||||
bpf_cgroup_storage_unlink(pl->storage[stype]);
|
||||
bpf_cgroup_storage_free(pl->storage[stype]);
|
||||
}
|
||||
bpf_cgroup_storages_unlink(pl->storage);
|
||||
bpf_cgroup_storages_free(pl->storage);
|
||||
kfree(pl);
|
||||
if (list_empty(progs))
|
||||
/* last program was detached, reset flags to zero */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user