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qed: Make qed_write_table() synchronous 

Note that this code is generally not running in coroutine context, so
this is an actual blocking synchronous operation. We'll fix this in a
moment.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2016-11-14 14:56:32 +01:00
parent f13d712bb2
commit 602b57fba4
1 changed files with 30 additions and 54 deletions
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84
block/qed-table.c
View File

@ -52,46 +52,6 @@ out:
return ret;
}
typedef struct {
GenericCB gencb;
BDRVQEDState *s;
QEDTable *orig_table;
QEDTable *table;
bool flush; /* flush after write? */
struct iovec iov;
QEMUIOVector qiov;
} QEDWriteTableCB;
static void qed_write_table_cb(void *opaque, int ret)
{
QEDWriteTableCB *write_table_cb = opaque;
BDRVQEDState *s = write_table_cb->s;
trace_qed_write_table_cb(s,
write_table_cb->orig_table,
write_table_cb->flush,
ret);
if (ret) {
goto out;
}
if (write_table_cb->flush) {
/* We still need to flush first */
write_table_cb->flush = false;
qed_acquire(s);
bdrv_aio_flush(write_table_cb->s->bs, qed_write_table_cb,
write_table_cb);
qed_release(s);
return;
}
out:
qemu_vfree(write_table_cb->table);
gencb_complete(&write_table_cb->gencb, ret);
}
/**
* Write out an updated part or all of a table
*
@ -108,10 +68,13 @@ static void qed_write_table(BDRVQEDState *s, uint64_t offset, QEDTable *table,
unsigned int index, unsigned int n, bool flush,
BlockCompletionFunc *cb, void *opaque)
{
QEDWriteTableCB *write_table_cb;
unsigned int sector_mask = BDRV_SECTOR_SIZE / sizeof(uint64_t) - 1;
unsigned int start, end, i;
QEDTable *new_table;
struct iovec iov;
QEMUIOVector qiov;
size_t len_bytes;
int ret;
trace_qed_write_table(s, offset, table, index, n);
@ -121,28 +84,41 @@ static void qed_write_table(BDRVQEDState *s, uint64_t offset, QEDTable *table,
len_bytes = (end - start) * sizeof(uint64_t);
write_table_cb = gencb_alloc(sizeof(*write_table_cb), cb, opaque);
write_table_cb->s = s;
write_table_cb->orig_table = table;
write_table_cb->flush = flush;
write_table_cb->table = qemu_blockalign(s->bs, len_bytes);
write_table_cb->iov.iov_base = write_table_cb->table->offsets;
write_table_cb->iov.iov_len = len_bytes;
qemu_iovec_init_external(&write_table_cb->qiov, &write_table_cb->iov, 1);
new_table = qemu_blockalign(s->bs, len_bytes);
iov = (struct iovec) {
.iov_base = new_table->offsets,
.iov_len = len_bytes,
};
qemu_iovec_init_external(&qiov, &iov, 1);
/* Byteswap table */
for (i = start; i < end; i++) {
uint64_t le_offset = cpu_to_le64(table->offsets[i]);
write_table_cb->table->offsets[i - start] = le_offset;
new_table->offsets[i - start] = le_offset;
}
/* Adjust for offset into table */
offset += start * sizeof(uint64_t);
bdrv_aio_writev(s->bs->file, offset / BDRV_SECTOR_SIZE,
&write_table_cb->qiov,
write_table_cb->qiov.size / BDRV_SECTOR_SIZE,
qed_write_table_cb, write_table_cb);
ret = bdrv_pwritev(s->bs->file, offset, &qiov);
trace_qed_write_table_cb(s, table, flush, ret);
if (ret < 0) {
goto out;
}
if (flush) {
qed_acquire(s);
ret = bdrv_flush(s->bs);
qed_release(s);
if (ret < 0) {
goto out;
}
}
ret = 0;
out:
qemu_vfree(new_table);
cb(opaque, ret);
}
/**