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https://github.com/qemu/qemu.git
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hw/9pfs: Update v9fs_read 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
parent
7eafdcc96c
commit
d208a0e005
@ -77,32 +77,6 @@ void cred_init(FsCred *credp)
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credp->fc_rdev = -1;
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}
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static int v9fs_do_lstat(V9fsState *s, V9fsString *path, struct stat *stbuf)
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{
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return s->ops->lstat(&s->ctx, path->data, stbuf);
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}
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static void v9fs_do_rewinddir(V9fsState *s, DIR *dir)
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{
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return s->ops->rewinddir(&s->ctx, dir);
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}
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static off_t v9fs_do_telldir(V9fsState *s, DIR *dir)
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{
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return s->ops->telldir(&s->ctx, dir);
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}
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static void v9fs_do_seekdir(V9fsState *s, DIR *dir, off_t off)
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{
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return s->ops->seekdir(&s->ctx, dir, off);
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}
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static int v9fs_do_preadv(V9fsState *s, int fd, const struct iovec *iov,
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int iovcnt, int64_t offset)
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{
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return s->ops->preadv(&s->ctx, fd, iov, iovcnt, offset);
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}
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static void v9fs_string_init(V9fsString *str)
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{
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str->data = NULL;
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@ -1488,207 +1462,152 @@ out:
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complete_pdu(s, pdu, err);
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}
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static void v9fs_read_post_readdir(V9fsState *, V9fsReadState *, ssize_t);
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static void v9fs_read_post_seekdir(V9fsState *s, V9fsReadState *vs, ssize_t err)
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static int v9fs_xattr_read(V9fsState *s, V9fsPDU *pdu,
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V9fsFidState *fidp, int64_t off, int32_t max_count)
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{
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if (err) {
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goto out;
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}
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vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
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vs->offset += vs->count;
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err = vs->offset;
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out:
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complete_pdu(s, vs->pdu, err);
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v9fs_stat_free(&vs->v9stat);
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v9fs_string_free(&vs->name);
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g_free(vs);
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return;
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}
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static void v9fs_read_post_dir_lstat(V9fsState *s, V9fsReadState *vs,
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ssize_t err)
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{
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if (err) {
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err = -errno;
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goto out;
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}
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err = stat_to_v9stat(s, &vs->name, &vs->stbuf, &vs->v9stat);
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if (err) {
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goto out;
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}
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vs->len = pdu_marshal(vs->pdu, vs->offset + 4 + vs->count, "S",
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&vs->v9stat);
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if ((vs->len != (vs->v9stat.size + 2)) ||
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((vs->count + vs->len) > vs->max_count)) {
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v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->dir_pos);
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v9fs_read_post_seekdir(s, vs, err);
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return;
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}
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vs->count += vs->len;
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v9fs_stat_free(&vs->v9stat);
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v9fs_string_free(&vs->name);
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vs->dir_pos = vs->dent->d_off;
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v9fs_co_readdir(s, vs->fidp, &vs->dent);
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v9fs_read_post_readdir(s, vs, err);
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return;
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out:
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v9fs_do_seekdir(s, vs->fidp->fs.dir, vs->dir_pos);
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v9fs_read_post_seekdir(s, vs, err);
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return;
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}
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static void v9fs_read_post_readdir(V9fsState *s, V9fsReadState *vs, ssize_t err)
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{
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if (vs->dent) {
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memset(&vs->v9stat, 0, sizeof(vs->v9stat));
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v9fs_string_init(&vs->name);
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v9fs_string_sprintf(&vs->name, "%s/%s", vs->fidp->path.data,
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vs->dent->d_name);
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err = v9fs_do_lstat(s, &vs->name, &vs->stbuf);
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v9fs_read_post_dir_lstat(s, vs, err);
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return;
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}
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vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
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vs->offset += vs->count;
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err = vs->offset;
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complete_pdu(s, vs->pdu, err);
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g_free(vs);
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return;
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}
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static void v9fs_read_post_telldir(V9fsState *s, V9fsReadState *vs, ssize_t err)
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{
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v9fs_co_readdir(s, vs->fidp, &vs->dent);
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v9fs_read_post_readdir(s, vs, err);
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return;
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}
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static void v9fs_read_post_rewinddir(V9fsState *s, V9fsReadState *vs,
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ssize_t err)
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{
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vs->dir_pos = v9fs_do_telldir(s, vs->fidp->fs.dir);
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v9fs_read_post_telldir(s, vs, err);
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return;
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}
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static void v9fs_read_post_preadv(V9fsState *s, V9fsReadState *vs, ssize_t err)
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{
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if (err < 0) {
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/* IO error return the error */
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err = -errno;
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goto out;
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}
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vs->total += vs->len;
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vs->sg = adjust_sg(vs->sg, vs->len, &vs->cnt);
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if (vs->total < vs->count && vs->len > 0) {
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do {
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if (0) {
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print_sg(vs->sg, vs->cnt);
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}
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vs->len = v9fs_do_preadv(s, vs->fidp->fs.fd, vs->sg, vs->cnt,
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vs->off);
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if (vs->len > 0) {
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vs->off += vs->len;
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}
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} while (vs->len == -1 && errno == EINTR);
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if (vs->len == -1) {
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err = -errno;
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}
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v9fs_read_post_preadv(s, vs, err);
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return;
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}
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vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->total);
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vs->offset += vs->count;
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err = vs->offset;
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out:
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complete_pdu(s, vs->pdu, err);
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g_free(vs);
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}
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static void v9fs_xattr_read(V9fsState *s, V9fsReadState *vs)
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{
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ssize_t err = 0;
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size_t offset = 7;
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int read_count;
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int64_t xattr_len;
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xattr_len = vs->fidp->fs.xattr.len;
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read_count = xattr_len - vs->off;
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if (read_count > vs->count) {
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read_count = vs->count;
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xattr_len = fidp->fs.xattr.len;
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read_count = xattr_len - off;
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if (read_count > max_count) {
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read_count = max_count;
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} else if (read_count < 0) {
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/*
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* read beyond XATTR value
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*/
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read_count = 0;
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}
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vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", read_count);
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vs->offset += pdu_pack(vs->pdu, vs->offset,
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((char *)vs->fidp->fs.xattr.value) + vs->off,
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read_count);
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err = vs->offset;
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complete_pdu(s, vs->pdu, err);
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g_free(vs);
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offset += pdu_marshal(pdu, offset, "d", read_count);
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offset += pdu_pack(pdu, offset,
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((char *)fidp->fs.xattr.value) + off,
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read_count);
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return offset;
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}
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static int v9fs_do_readdir_with_stat(V9fsState *s, V9fsPDU *pdu,
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V9fsFidState *fidp, int32_t max_count)
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{
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V9fsString name;
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V9fsStat v9stat;
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int len, err = 0;
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int32_t count = 0;
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struct stat stbuf;
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off_t saved_dir_pos;
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struct dirent *dent;
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/* save the directory position */
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saved_dir_pos = v9fs_co_telldir(s, fidp);
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if (saved_dir_pos < 0) {
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return saved_dir_pos;
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}
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while (1) {
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v9fs_string_init(&name);
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err = v9fs_co_readdir(s, fidp, &dent);
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if (err || !dent) {
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break;
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}
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v9fs_string_sprintf(&name, "%s/%s", fidp->path.data, dent->d_name);
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err = v9fs_co_lstat(s, &name, &stbuf);
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if (err < 0) {
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goto out;
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}
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err = stat_to_v9stat(s, &name, &stbuf, &v9stat);
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if (err < 0) {
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goto out;
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}
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/* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
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len = pdu_marshal(pdu, 11 + count, "S", &v9stat);
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if ((len != (v9stat.size + 2)) || ((count + len) > max_count)) {
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/* Ran out of buffer. Set dir back to old position and return */
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v9fs_co_seekdir(s, fidp, saved_dir_pos);
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v9fs_stat_free(&v9stat);
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v9fs_string_free(&name);
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return count;
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}
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count += len;
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v9fs_stat_free(&v9stat);
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v9fs_string_free(&name);
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saved_dir_pos = dent->d_off;
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}
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out:
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v9fs_string_free(&name);
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if (err < 0) {
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return err;
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}
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return count;
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}
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static void v9fs_read(void *opaque)
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{
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int32_t fid;
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int64_t off;
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ssize_t err = 0;
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int32_t count = 0;
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size_t offset = 7;
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int32_t max_count;
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V9fsFidState *fidp;
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V9fsPDU *pdu = opaque;
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V9fsState *s = pdu->s;
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int32_t fid;
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V9fsReadState *vs;
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ssize_t err = 0;
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vs = g_malloc(sizeof(*vs));
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vs->pdu = pdu;
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vs->offset = 7;
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vs->total = 0;
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vs->len = 0;
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vs->count = 0;
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pdu_unmarshal(vs->pdu, vs->offset, "dqd", &fid, &vs->off, &vs->count);
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vs->fidp = lookup_fid(s, fid);
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if (vs->fidp == NULL) {
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pdu_unmarshal(pdu, offset, "dqd", &fid, &off, &max_count);
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fidp = lookup_fid(s, fid);
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if (fidp == NULL) {
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err = -EINVAL;
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goto out;
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}
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if (fidp->fid_type == P9_FID_DIR) {
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if (vs->fidp->fid_type == P9_FID_DIR) {
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vs->max_count = vs->count;
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vs->count = 0;
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if (vs->off == 0) {
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v9fs_do_rewinddir(s, vs->fidp->fs.dir);
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if (off == 0) {
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v9fs_co_rewinddir(s, fidp);
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}
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v9fs_read_post_rewinddir(s, vs, err);
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return;
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} else if (vs->fidp->fid_type == P9_FID_FILE) {
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vs->sg = vs->iov;
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pdu_marshal(vs->pdu, vs->offset + 4, "v", vs->sg, &vs->cnt);
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vs->sg = cap_sg(vs->sg, vs->count, &vs->cnt);
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if (vs->total <= vs->count) {
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vs->len = v9fs_do_preadv(s, vs->fidp->fs.fd, vs->sg, vs->cnt,
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vs->off);
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if (vs->len > 0) {
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vs->off += vs->len;
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count = v9fs_do_readdir_with_stat(s, pdu, fidp, max_count);
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if (count < 0) {
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err = count;
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goto out;
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}
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err = offset;
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err += pdu_marshal(pdu, offset, "d", count);
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err += count;
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} else if (fidp->fid_type == P9_FID_FILE) {
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int32_t cnt;
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int32_t len;
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struct iovec *sg;
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struct iovec iov[128]; /* FIXME: bad, bad, bad */
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sg = iov;
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pdu_marshal(pdu, offset + 4, "v", sg, &cnt);
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sg = cap_sg(sg, max_count, &cnt);
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do {
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if (0) {
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print_sg(sg, cnt);
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}
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err = vs->len;
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v9fs_read_post_preadv(s, vs, err);
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}
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return;
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} else if (vs->fidp->fid_type == P9_FID_XATTR) {
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v9fs_xattr_read(s, vs);
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return;
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/* Loop in case of EINTR */
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do {
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len = v9fs_co_preadv(s, fidp, sg, cnt, off);
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if (len >= 0) {
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off += len;
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count += len;
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}
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} while (len == -EINTR);
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if (len < 0) {
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/* IO error return the error */
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err = len;
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goto out;
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}
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sg = adjust_sg(sg, len, &cnt);
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} while (count < max_count && len > 0);
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err = offset;
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err += pdu_marshal(pdu, offset, "d", count);
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err += count;
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} else if (fidp->fid_type == P9_FID_XATTR) {
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err = v9fs_xattr_read(s, pdu, fidp, off, max_count);
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} else {
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err = -EINVAL;
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}
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out:
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complete_pdu(s, pdu, err);
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g_free(vs);
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}
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static size_t v9fs_readdir_data_size(V9fsString *name)
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