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hw/9pfs: Update v9fs_write to use coroutines 

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
This commit is contained in:
Aneesh Kumar K.V 2011-05-08 12:29:31 +05:30
parent f6b3c976c6
commit d7a9049119
1 changed files with 59 additions and 89 deletions
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148
hw/9pfs/virtio-9p.c
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@ -103,12 +103,6 @@ static int v9fs_do_preadv(V9fsState *s, int fd, const struct iovec *iov,
return s->ops->preadv(&s->ctx, fd, iov, iovcnt, offset);
}
static int v9fs_do_pwritev(V9fsState *s, int fd, const struct iovec *iov,
int iovcnt, int64_t offset)
{
return s->ops->pwritev(&s->ctx, fd, iov, iovcnt, offset);
}
static int v9fs_do_chmod(V9fsState *s, V9fsString *path, mode_t mode)
{
FsCred cred;
@ -1834,51 +1828,21 @@ out:
complete_pdu(s, pdu, retval);
}
static void v9fs_write_post_pwritev(V9fsState *s, V9fsWriteState *vs,
ssize_t err)
{
if (err < 0) {
/* IO error return the error */
err = -errno;
goto out;
}
vs->total += vs->len;
vs->sg = adjust_sg(vs->sg, vs->len, &vs->cnt);
if (vs->total < vs->count && vs->len > 0) {
do {
if (0) {
print_sg(vs->sg, vs->cnt);
}
vs->len = v9fs_do_pwritev(s, vs->fidp->fs.fd, vs->sg, vs->cnt,
vs->off);
if (vs->len > 0) {
vs->off += vs->len;
}
} while (vs->len == -1 && errno == EINTR);
if (vs->len == -1) {
err = -errno;
}
v9fs_write_post_pwritev(s, vs, err);
return;
}
vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->total);
err = vs->offset;
out:
complete_pdu(s, vs->pdu, err);
g_free(vs);
}
static void v9fs_xattr_write(V9fsState *s, V9fsWriteState *vs)
static int v9fs_xattr_write(V9fsState *s, V9fsPDU *pdu, V9fsFidState *fidp,
int64_t off, int32_t count,
struct iovec *sg, int cnt)
{
int i, to_copy;
ssize_t err = 0;
int write_count;
int64_t xattr_len;
size_t offset = 7;
xattr_len = vs->fidp->fs.xattr.len;
write_count = xattr_len - vs->off;
if (write_count > vs->count) {
write_count = vs->count;
xattr_len = fidp->fs.xattr.len;
write_count = xattr_len - off;
if (write_count > count) {
write_count = count;
} else if (write_count < 0) {
/*
* write beyond XATTR value len specified in
@ -1887,82 +1851,88 @@ static void v9fs_xattr_write(V9fsState *s, V9fsWriteState *vs)
err = -ENOSPC;
goto out;
}
vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", write_count);
err = vs->offset;
vs->fidp->fs.xattr.copied_len += write_count;
offset += pdu_marshal(pdu, offset, "d", write_count);
err = offset;
fidp->fs.xattr.copied_len += write_count;
/*
* Now copy the content from sg list
*/
for (i = 0; i < vs->cnt; i++) {
if (write_count > vs->sg[i].iov_len) {
to_copy = vs->sg[i].iov_len;
for (i = 0; i < cnt; i++) {
if (write_count > sg[i].iov_len) {
to_copy = sg[i].iov_len;
} else {
to_copy = write_count;
}
memcpy((char *)vs->fidp->fs.xattr.value + vs->off,
vs->sg[i].iov_base, to_copy);
memcpy((char *)fidp->fs.xattr.value + off, sg[i].iov_base, to_copy);
/* updating vs->off since we are not using below */
vs->off += to_copy;
off += to_copy;
write_count -= to_copy;
}
out:
complete_pdu(s, vs->pdu, err);
g_free(vs);
return err;
}
static void v9fs_write(void *opaque)
{
int cnt;
ssize_t err;
int32_t fid;
int64_t off;
int32_t count;
int32_t len = 0;
int32_t total = 0;
size_t offset = 7;
V9fsFidState *fidp;
struct iovec iov[128]; /* FIXME: bad, bad, bad */
struct iovec *sg = iov;
V9fsPDU *pdu = opaque;
V9fsState *s = pdu->s;
int32_t fid;
V9fsWriteState *vs;
ssize_t err;
vs = g_malloc(sizeof(*vs));
vs->pdu = pdu;
vs->offset = 7;
vs->sg = vs->iov;
vs->total = 0;
vs->len = 0;
pdu_unmarshal(vs->pdu, vs->offset, "dqdv", &fid, &vs->off, &vs->count,
vs->sg, &vs->cnt);
vs->fidp = lookup_fid(s, fid);
if (vs->fidp == NULL) {
pdu_unmarshal(pdu, offset, "dqdv", &fid, &off, &count, sg, &cnt);
fidp = lookup_fid(s, fid);
if (fidp == NULL) {
err = -EINVAL;
goto out;
}
if (vs->fidp->fid_type == P9_FID_FILE) {
if (vs->fidp->fs.fd == -1) {
if (fidp->fid_type == P9_FID_FILE) {
if (fidp->fs.fd == -1) {
err = -EINVAL;
goto out;
}
} else if (vs->fidp->fid_type == P9_FID_XATTR) {
} else if (fidp->fid_type == P9_FID_XATTR) {
/*
* setxattr operation
*/
v9fs_xattr_write(s, vs);
return;
err = v9fs_xattr_write(s, pdu, fidp, off, count, sg, cnt);
goto out;
} else {
err = -EINVAL;
goto out;
}
vs->sg = cap_sg(vs->sg, vs->count, &vs->cnt);
if (vs->total <= vs->count) {
vs->len = v9fs_do_pwritev(s, vs->fidp->fs.fd, vs->sg, vs->cnt, vs->off);
if (vs->len > 0) {
vs->off += vs->len;
sg = cap_sg(sg, count, &cnt);
do {
if (0) {
print_sg(sg, cnt);
}
err = vs->len;
v9fs_write_post_pwritev(s, vs, err);
}
return;
/* Loop in case of EINTR */
do {
len = v9fs_co_pwritev(s, fidp, sg, cnt, off);
if (len >= 0) {
off += len;
total += len;
}
} while (len == -EINTR);
if (len < 0) {
/* IO error return the error */
err = len;
goto out;
}
sg = adjust_sg(sg, len, &cnt);
} while (total < count && len > 0);
offset += pdu_marshal(pdu, offset, "d", total);
err = offset;
out:
complete_pdu(s, vs->pdu, err);
g_free(vs);
complete_pdu(s, pdu, err);
}
static void v9fs_create(void *opaque)