320 lines
8.9 KiB
C
320 lines
8.9 KiB
C
/*
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* QEMU Enhanced Disk Format Table I/O
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*
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* Copyright IBM, Corp. 2010
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*
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* Authors:
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* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#include "trace.h"
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#include "qemu_socket.h" /* for EINPROGRESS on Windows */
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#include "qed.h"
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typedef struct {
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GenericCB gencb;
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BDRVQEDState *s;
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QEDTable *table;
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struct iovec iov;
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QEMUIOVector qiov;
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} QEDReadTableCB;
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static void qed_read_table_cb(void *opaque, int ret)
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{
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QEDReadTableCB *read_table_cb = opaque;
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QEDTable *table = read_table_cb->table;
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int noffsets = read_table_cb->iov.iov_len / sizeof(uint64_t);
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int i;
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/* Handle I/O error */
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if (ret) {
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goto out;
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}
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/* Byteswap offsets */
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for (i = 0; i < noffsets; i++) {
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table->offsets[i] = le64_to_cpu(table->offsets[i]);
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}
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out:
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/* Completion */
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trace_qed_read_table_cb(read_table_cb->s, read_table_cb->table, ret);
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gencb_complete(&read_table_cb->gencb, ret);
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}
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static void qed_read_table(BDRVQEDState *s, uint64_t offset, QEDTable *table,
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BlockDriverCompletionFunc *cb, void *opaque)
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{
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QEDReadTableCB *read_table_cb = gencb_alloc(sizeof(*read_table_cb),
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cb, opaque);
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QEMUIOVector *qiov = &read_table_cb->qiov;
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BlockDriverAIOCB *aiocb;
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trace_qed_read_table(s, offset, table);
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read_table_cb->s = s;
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read_table_cb->table = table;
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read_table_cb->iov.iov_base = table->offsets,
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read_table_cb->iov.iov_len = s->header.cluster_size * s->header.table_size,
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qemu_iovec_init_external(qiov, &read_table_cb->iov, 1);
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aiocb = bdrv_aio_readv(s->bs->file, offset / BDRV_SECTOR_SIZE, qiov,
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read_table_cb->iov.iov_len / BDRV_SECTOR_SIZE,
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qed_read_table_cb, read_table_cb);
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if (!aiocb) {
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qed_read_table_cb(read_table_cb, -EIO);
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}
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}
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typedef struct {
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GenericCB gencb;
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BDRVQEDState *s;
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QEDTable *orig_table;
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QEDTable *table;
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bool flush; /* flush after write? */
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struct iovec iov;
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QEMUIOVector qiov;
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} QEDWriteTableCB;
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static void qed_write_table_cb(void *opaque, int ret)
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{
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QEDWriteTableCB *write_table_cb = opaque;
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trace_qed_write_table_cb(write_table_cb->s,
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write_table_cb->orig_table,
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write_table_cb->flush,
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ret);
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if (ret) {
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goto out;
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}
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if (write_table_cb->flush) {
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/* We still need to flush first */
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write_table_cb->flush = false;
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bdrv_aio_flush(write_table_cb->s->bs, qed_write_table_cb,
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write_table_cb);
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return;
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}
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out:
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qemu_vfree(write_table_cb->table);
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gencb_complete(&write_table_cb->gencb, ret);
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return;
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}
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/**
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* Write out an updated part or all of a table
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*
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* @s: QED state
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* @offset: Offset of table in image file, in bytes
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* @table: Table
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* @index: Index of first element
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* @n: Number of elements
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* @flush: Whether or not to sync to disk
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* @cb: Completion function
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* @opaque: Argument for completion function
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*/
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static void qed_write_table(BDRVQEDState *s, uint64_t offset, QEDTable *table,
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unsigned int index, unsigned int n, bool flush,
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BlockDriverCompletionFunc *cb, void *opaque)
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{
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QEDWriteTableCB *write_table_cb;
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BlockDriverAIOCB *aiocb;
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unsigned int sector_mask = BDRV_SECTOR_SIZE / sizeof(uint64_t) - 1;
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unsigned int start, end, i;
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size_t len_bytes;
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trace_qed_write_table(s, offset, table, index, n);
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/* Calculate indices of the first and one after last elements */
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start = index & ~sector_mask;
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end = (index + n + sector_mask) & ~sector_mask;
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len_bytes = (end - start) * sizeof(uint64_t);
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write_table_cb = gencb_alloc(sizeof(*write_table_cb), cb, opaque);
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write_table_cb->s = s;
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write_table_cb->orig_table = table;
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write_table_cb->flush = flush;
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write_table_cb->table = qemu_blockalign(s->bs, len_bytes);
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write_table_cb->iov.iov_base = write_table_cb->table->offsets;
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write_table_cb->iov.iov_len = len_bytes;
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qemu_iovec_init_external(&write_table_cb->qiov, &write_table_cb->iov, 1);
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/* Byteswap table */
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for (i = start; i < end; i++) {
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uint64_t le_offset = cpu_to_le64(table->offsets[i]);
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write_table_cb->table->offsets[i - start] = le_offset;
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}
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/* Adjust for offset into table */
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offset += start * sizeof(uint64_t);
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aiocb = bdrv_aio_writev(s->bs->file, offset / BDRV_SECTOR_SIZE,
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&write_table_cb->qiov,
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write_table_cb->iov.iov_len / BDRV_SECTOR_SIZE,
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qed_write_table_cb, write_table_cb);
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if (!aiocb) {
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qed_write_table_cb(write_table_cb, -EIO);
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}
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}
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/**
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* Propagate return value from async callback
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*/
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static void qed_sync_cb(void *opaque, int ret)
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{
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*(int *)opaque = ret;
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}
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int qed_read_l1_table_sync(BDRVQEDState *s)
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{
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int ret = -EINPROGRESS;
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async_context_push();
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qed_read_table(s, s->header.l1_table_offset,
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s->l1_table, qed_sync_cb, &ret);
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while (ret == -EINPROGRESS) {
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qemu_aio_wait();
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}
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async_context_pop();
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return ret;
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}
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void qed_write_l1_table(BDRVQEDState *s, unsigned int index, unsigned int n,
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BlockDriverCompletionFunc *cb, void *opaque)
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{
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BLKDBG_EVENT(s->bs->file, BLKDBG_L1_UPDATE);
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qed_write_table(s, s->header.l1_table_offset,
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s->l1_table, index, n, false, cb, opaque);
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}
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int qed_write_l1_table_sync(BDRVQEDState *s, unsigned int index,
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unsigned int n)
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{
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int ret = -EINPROGRESS;
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async_context_push();
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qed_write_l1_table(s, index, n, qed_sync_cb, &ret);
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while (ret == -EINPROGRESS) {
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qemu_aio_wait();
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}
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async_context_pop();
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return ret;
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}
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typedef struct {
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GenericCB gencb;
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BDRVQEDState *s;
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uint64_t l2_offset;
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QEDRequest *request;
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} QEDReadL2TableCB;
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static void qed_read_l2_table_cb(void *opaque, int ret)
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{
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QEDReadL2TableCB *read_l2_table_cb = opaque;
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QEDRequest *request = read_l2_table_cb->request;
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BDRVQEDState *s = read_l2_table_cb->s;
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CachedL2Table *l2_table = request->l2_table;
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if (ret) {
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/* can't trust loaded L2 table anymore */
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qed_unref_l2_cache_entry(l2_table);
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request->l2_table = NULL;
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} else {
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l2_table->offset = read_l2_table_cb->l2_offset;
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qed_commit_l2_cache_entry(&s->l2_cache, l2_table);
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/* This is guaranteed to succeed because we just committed the entry
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* to the cache.
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*/
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request->l2_table = qed_find_l2_cache_entry(&s->l2_cache,
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l2_table->offset);
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assert(request->l2_table != NULL);
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}
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gencb_complete(&read_l2_table_cb->gencb, ret);
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}
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void qed_read_l2_table(BDRVQEDState *s, QEDRequest *request, uint64_t offset,
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BlockDriverCompletionFunc *cb, void *opaque)
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{
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QEDReadL2TableCB *read_l2_table_cb;
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qed_unref_l2_cache_entry(request->l2_table);
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/* Check for cached L2 entry */
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request->l2_table = qed_find_l2_cache_entry(&s->l2_cache, offset);
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if (request->l2_table) {
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cb(opaque, 0);
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return;
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}
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request->l2_table = qed_alloc_l2_cache_entry(&s->l2_cache);
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request->l2_table->table = qed_alloc_table(s);
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read_l2_table_cb = gencb_alloc(sizeof(*read_l2_table_cb), cb, opaque);
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read_l2_table_cb->s = s;
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read_l2_table_cb->l2_offset = offset;
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read_l2_table_cb->request = request;
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BLKDBG_EVENT(s->bs->file, BLKDBG_L2_LOAD);
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qed_read_table(s, offset, request->l2_table->table,
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qed_read_l2_table_cb, read_l2_table_cb);
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}
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int qed_read_l2_table_sync(BDRVQEDState *s, QEDRequest *request, uint64_t offset)
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{
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int ret = -EINPROGRESS;
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async_context_push();
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qed_read_l2_table(s, request, offset, qed_sync_cb, &ret);
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while (ret == -EINPROGRESS) {
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qemu_aio_wait();
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}
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async_context_pop();
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return ret;
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}
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void qed_write_l2_table(BDRVQEDState *s, QEDRequest *request,
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unsigned int index, unsigned int n, bool flush,
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BlockDriverCompletionFunc *cb, void *opaque)
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{
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BLKDBG_EVENT(s->bs->file, BLKDBG_L2_UPDATE);
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qed_write_table(s, request->l2_table->offset,
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request->l2_table->table, index, n, flush, cb, opaque);
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}
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int qed_write_l2_table_sync(BDRVQEDState *s, QEDRequest *request,
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unsigned int index, unsigned int n, bool flush)
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{
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int ret = -EINPROGRESS;
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async_context_push();
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qed_write_l2_table(s, request, index, n, flush, qed_sync_cb, &ret);
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while (ret == -EINPROGRESS) {
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qemu_aio_wait();
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}
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async_context_pop();
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return ret;
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}
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