#include "cls/rbd/cls_rbd_client.h"
#include "common/dout.h"
#include "common/errno.h"
+#include "include/err.h"
#include "librbd/AsyncObjectThrottle.h"
#include "librbd/ExclusiveLock.h"
#include "librbd/ImageCtx.h"
namespace librbd {
namespace operation {
+namespace {
+
+bool may_be_trimmed(const std::map<uint64_t,uint64_t> &extent_map,
+ const bufferlist &bl, size_t sparse_size,
+ uint64_t *new_end_ptr) {
+ if (extent_map.empty()) {
+ *new_end_ptr = 0;
+ return true;
+ }
+
+ uint64_t end = extent_map.rbegin()->first + extent_map.rbegin()->second;
+ uint64_t new_end = end;
+ uint64_t bl_off = bl.length();
+
+ for (auto it = extent_map.rbegin(); it != extent_map.rend(); it++) {
+ auto off = it->first;
+ auto len = it->second;
+
+ new_end = p2roundup<uint64_t>(off + len, sparse_size);
+
+ uint64_t extent_left = len;
+ uint64_t sub_len = len % sparse_size;
+ if (sub_len == 0) {
+ sub_len = sparse_size;
+ }
+ while (extent_left > 0) {
+ ceph_assert(bl_off >= sub_len);
+ bl_off -= sub_len;
+ bufferlist sub_bl;
+ sub_bl.substr_of(bl, bl_off, sub_len);
+ if (!sub_bl.is_zero()) {
+ break;
+ }
+ new_end -= sparse_size;
+ extent_left -= sub_len;
+ sub_len = sparse_size;
+ }
+ if (extent_left > 0) {
+ break;
+ }
+ }
+
+ if (new_end < end) {
+ *new_end_ptr = new_end;
+ return true;
+ }
+
+ return false;
+}
+
+} // anonymous namespace
+
using util::create_context_callback;
using util::create_rados_callback;
*
* <start>
* |
- * v (object map disabled)
- * SPARSIFY -----------------------\
- * | |
- * | (object map enabled) |
- * v |
- * PRE UPDATE OBJECT MAP |
- * | |
- * v |
- * CHECK EXISTS |
- * | |
- * v |
- * POST UPDATE OBJECT MAP |
- * | |
- * v |
- * <finish> <----------------------/
+ * v (not supported)
+ * SPARSIFY * * * * * * * * * * * * > READ < * * * * * * * * * * (concurrent
+ * | | * update is
+ * | (object map disabled) | (can trim) * detected)
+ * |------------------------\ V *
+ * | | PRE UPDATE OBJECT MAP *
+ * | (object map enabled) | | (if needed) *
+ * v | V *
+ * PRE UPDATE OBJECT MAP | TRIM * * * * * * * * * * *
+ * | | |
+ * v | V
+ * CHECK EXISTS | POST UPDATE OBJECT MAP
+ * | | | (if needed)
+ * v | |
+ * POST UPDATE OBJECT MAP | |
+ * | | |
+ * v | |
+ * <finish> <------------------/<-------/
*
* @endverbatim
*
void handle_sparsify(int r) {
ldout(m_cct, 20) << "r=" << r << dendl;
- if (r < 0 && r != -ENOENT) {
- lderr(m_cct) << "failed to sparsify: " << cpp_strerror(r) << dendl;
+ if (r == -EOPNOTSUPP) {
+ m_trying_trim = true;
+ send_read();
+ return;
}
if (r == -ENOENT) {
- this->complete(0);
+ finish_op(0);
+ return;
+ }
+
+ if (r < 0) {
+ lderr(m_cct) << "failed to sparsify: " << cpp_strerror(r) << dendl;
+ finish_op(r);
return;
}
}
void send_pre_update_object_map() {
- I *image_ctx = &this->m_image_ctx;
+ I &image_ctx = this->m_image_ctx;
- if (!m_remove_empty || !image_ctx->test_features(RBD_FEATURE_OBJECT_MAP)) {
- this->complete(0);
+ if (m_trying_trim) {
+ if (!m_remove_empty || m_new_end != 0 ||
+ !image_ctx.test_features(RBD_FEATURE_OBJECT_MAP)) {
+ send_trim();
+ return;
+ }
+ } else if (!m_remove_empty ||
+ !image_ctx.test_features(RBD_FEATURE_OBJECT_MAP)) {
+ finish_op(0);
return;
}
ldout(m_cct, 20) << dendl;
- image_ctx->owner_lock.get_read();
- image_ctx->snap_lock.get_read();
- if (image_ctx->object_map == nullptr) {
+ image_ctx.owner_lock.get_read();
+ image_ctx.snap_lock.get_read();
+ if (image_ctx.object_map == nullptr) {
// possible that exclusive lock was lost in background
lderr(m_cct) << "object map is not initialized" << dendl;
- image_ctx->snap_lock.put_read();
- image_ctx->owner_lock.put_read();
- this->complete(-EINVAL);
+ image_ctx.snap_lock.put_read();
+ image_ctx.owner_lock.put_read();
+ finish_op(-EINVAL);
return;
}
int r;
- m_finish_op_ctx = image_ctx->exclusive_lock->start_op(&r);
+ m_finish_op_ctx = image_ctx.exclusive_lock->start_op(&r);
if (m_finish_op_ctx == nullptr) {
lderr(m_cct) << "lost exclusive lock" << dendl;
- image_ctx->snap_lock.put_read();
- image_ctx->owner_lock.put_read();
- this->complete(r);
+ image_ctx.snap_lock.put_read();
+ image_ctx.owner_lock.put_read();
+ finish_op(r);
return;
}
C_SparsifyObject<I>,
&C_SparsifyObject<I>::handle_pre_update_object_map>(this);
- image_ctx->object_map_lock.get_write();
- bool sent = image_ctx->object_map->template aio_update<
+ image_ctx.object_map_lock.get_write();
+ bool sent = image_ctx.object_map->template aio_update<
Context, &Context::complete>(CEPH_NOSNAP, m_object_no, OBJECT_PENDING,
OBJECT_EXISTS, {}, false, ctx);
// NOTE: state machine might complete before we reach here
- image_ctx->object_map_lock.put_write();
- image_ctx->snap_lock.put_read();
- image_ctx->owner_lock.put_read();
+ image_ctx.object_map_lock.put_write();
+ image_ctx.snap_lock.put_read();
+ image_ctx.owner_lock.put_read();
if (!sent) {
- ctx->complete(0);
+ finish_op(0);
}
}
return;
}
- send_check_exists();
+ if (m_trying_trim) {
+ send_trim();
+ } else {
+ send_check_exists();
+ }
}
void send_check_exists() {
librados::ObjectReadOperation op;
op.stat(NULL, NULL, NULL);
- m_out_bl.clear();
+ m_bl.clear();
auto comp = create_rados_callback<
C_SparsifyObject, &C_SparsifyObject::handle_check_exists>(this);
- int r = image_ctx.data_ctx.aio_operate(m_oid, comp, &op, &m_out_bl);
+ int r = image_ctx.data_ctx.aio_operate(m_oid, comp, &op, &m_bl);
ceph_assert(r == 0);
comp->release();
}
void send_post_update_object_map(bool exists) {
I &image_ctx = this->m_image_ctx;
+ ldout(m_cct, 20) << dendl;
+
auto ctx = create_context_callback<
C_SparsifyObject<I>,
&C_SparsifyObject<I>::handle_post_update_object_map>(this);
finish_op(0);
}
+ void send_read() {
+ I &image_ctx = this->m_image_ctx;
+
+ ldout(m_cct, 20) << dendl;
+
+ librados::ObjectReadOperation op;
+ m_bl.clear();
+ op.sparse_read(0, image_ctx.layout.object_size, &m_extent_map, &m_bl,
+ nullptr);
+ auto comp = create_rados_callback<
+ C_SparsifyObject, &C_SparsifyObject::handle_read>(this);
+ int r = image_ctx.data_ctx.aio_operate(m_oid, comp, &op, &m_bl);
+ ceph_assert(r == 0);
+ comp->release();
+ }
+
+ void handle_read(int r) {
+ ldout(m_cct, 20) << "r=" << r << dendl;
+
+ if (r < 0) {
+ if (r == -ENOENT) {
+ r = 0;
+ } else {
+ lderr(m_cct) << "failed to read object: " << cpp_strerror(r) << dendl;
+ }
+ finish_op(r);
+ return;
+ }
+
+ if (!may_be_trimmed(m_extent_map, m_bl, m_sparse_size, &m_new_end)) {
+ finish_op(0);
+ return;
+ }
+
+ send_pre_update_object_map();
+ }
+
+ void send_trim() {
+ I &image_ctx = this->m_image_ctx;
+
+ ldout(m_cct, 20) << dendl;
+
+ ceph_assert(m_new_end < image_ctx.layout.object_size);
+
+ librados::ObjectWriteOperation op;
+ m_bl.clear();
+ m_bl.append_zero(image_ctx.layout.object_size - m_new_end);
+ op.cmpext(m_new_end, m_bl, nullptr);
+ if (m_new_end == 0 && m_remove_empty) {
+ op.remove();
+ } else {
+ op.truncate(m_new_end);
+ }
+
+ auto comp = create_rados_callback<
+ C_SparsifyObject, &C_SparsifyObject::handle_trim>(this);
+ int r = image_ctx.data_ctx.aio_operate(m_oid, comp, &op);
+ ceph_assert(r == 0);
+ comp->release();
+ }
+
+ void handle_trim(int r) {
+ I &image_ctx = this->m_image_ctx;
+
+ ldout(m_cct, 20) << "r=" << r << dendl;
+
+ if (r <= -MAX_ERRNO) {
+ m_finish_op_ctx->complete(0);
+ m_finish_op_ctx = nullptr;
+ send_read();
+ return;
+ }
+
+ if (r < 0 && r != -ENOENT) {
+ lderr(m_cct) << "failed to trim: " << cpp_strerror(r) << dendl;
+ finish_op(r);
+ return;
+ }
+
+ if (!m_remove_empty || m_new_end != 0 ||
+ !image_ctx.test_features(RBD_FEATURE_OBJECT_MAP)) {
+ finish_op(0);
+ return;
+ }
+
+ send_post_update_object_map(false);
+ }
+
void finish_op(int r) {
ldout(m_cct, 20) << "r=" << r << dendl;
- m_finish_op_ctx->complete(0);
+ if (m_finish_op_ctx != nullptr) {
+ m_finish_op_ctx->complete(0);
+ }
this->complete(r);
}
std::string m_oid;
bool m_remove_empty = false;
- bufferlist m_out_bl;
+ bool m_trying_trim = false;
+ bufferlist m_bl;
+ std::map<uint64_t,uint64_t> m_extent_map;
+ uint64_t m_new_end = 0;
Context *m_finish_op_ctx = nullptr;
};
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