virtio-9p: Add P9_TREAD support

Implement P9_TREAD support.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Anthony Liguori 2010-04-29 17:44:56 +05:30
parent a6568fe27f
commit a92315553d
3 changed files with 275 additions and 2 deletions

View File

@ -34,6 +34,12 @@ typedef struct FileOperations
int (*closedir)(FsContext *, DIR *);
DIR *(*opendir)(FsContext *, const char *);
int (*open)(FsContext *, const char *, int);
void (*rewinddir)(FsContext *, DIR *);
off_t (*telldir)(FsContext *, DIR *);
struct dirent *(*readdir)(FsContext *, DIR *);
void (*seekdir)(FsContext *, DIR *, off_t);
ssize_t (*readv)(FsContext *, int, const struct iovec *, int);
off_t (*lseek)(FsContext *, int, off_t, int);
void *opaque;
} FileOperations;
#endif

View File

@ -96,6 +96,37 @@ static DIR *local_opendir(FsContext *ctx, const char *path)
return opendir(rpath(ctx, path));
}
static void local_rewinddir(FsContext *ctx, DIR *dir)
{
return rewinddir(dir);
}
static off_t local_telldir(FsContext *ctx, DIR *dir)
{
return telldir(dir);
}
static struct dirent *local_readdir(FsContext *ctx, DIR *dir)
{
return readdir(dir);
}
static void local_seekdir(FsContext *ctx, DIR *dir, off_t off)
{
return seekdir(dir, off);
}
static ssize_t local_readv(FsContext *ctx, int fd, const struct iovec *iov,
int iovcnt)
{
return readv(fd, iov, iovcnt);
}
static off_t local_lseek(FsContext *ctx, int fd, off_t offset, int whence)
{
return lseek(fd, offset, whence);
}
FileOperations local_ops = {
.lstat = local_lstat,
.setuid = local_setuid,
@ -104,4 +135,10 @@ FileOperations local_ops = {
.closedir = local_closedir,
.open = local_open,
.opendir = local_opendir,
.rewinddir = local_rewinddir,
.telldir = local_telldir,
.readdir = local_readdir,
.seekdir = local_seekdir,
.readv = local_readv,
.lseek = local_lseek,
};

View File

@ -66,6 +66,37 @@ static DIR *v9fs_do_opendir(V9fsState *s, V9fsString *path)
return s->ops->opendir(&s->ctx, path->data);
}
static void v9fs_do_rewinddir(V9fsState *s, DIR *dir)
{
return s->ops->rewinddir(&s->ctx, dir);
}
static off_t v9fs_do_telldir(V9fsState *s, DIR *dir)
{
return s->ops->telldir(&s->ctx, dir);
}
static struct dirent *v9fs_do_readdir(V9fsState *s, DIR *dir)
{
return s->ops->readdir(&s->ctx, dir);
}
static void v9fs_do_seekdir(V9fsState *s, DIR *dir, off_t off)
{
return s->ops->seekdir(&s->ctx, dir, off);
}
static int v9fs_do_readv(V9fsState *s, int fd, const struct iovec *iov,
int iovcnt)
{
return s->ops->readv(&s->ctx, fd, iov, iovcnt);
}
static off_t v9fs_do_lseek(V9fsState *s, int fd, off_t offset, int whence)
{
return s->ops->lseek(&s->ctx, fd, offset, whence);
}
static void v9fs_string_init(V9fsString *str)
{
str->data = NULL;
@ -1285,11 +1316,210 @@ static void v9fs_clunk(V9fsState *s, V9fsPDU *pdu)
}
}
typedef struct V9fsReadState {
V9fsPDU *pdu;
size_t offset;
int32_t count;
int32_t total;
int64_t off;
V9fsFidState *fidp;
struct iovec iov[128]; /* FIXME: bad, bad, bad */
struct iovec *sg;
off_t dir_pos;
struct dirent *dent;
struct stat stbuf;
V9fsString name;
V9fsStat v9stat;
int32_t len;
int32_t cnt;
int32_t max_count;
} V9fsReadState;
static void v9fs_read_post_readdir(V9fsState *, V9fsReadState *, ssize_t);
static void v9fs_read_post_seekdir(V9fsState *s, V9fsReadState *vs, ssize_t err)
{
if (err) {
goto out;
}
v9fs_stat_free(&vs->v9stat);
v9fs_string_free(&vs->name);
vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
vs->offset += vs->count;
err = vs->offset;
out:
complete_pdu(s, vs->pdu, err);
qemu_free(vs);
return;
}
static void v9fs_read_post_dir_lstat(V9fsState *s, V9fsReadState *vs,
ssize_t err)
{
if (err) {
err = -errno;
goto out;
}
err = stat_to_v9stat(s, &vs->name, &vs->stbuf, &vs->v9stat);
if (err) {
goto out;
}
vs->len = pdu_marshal(vs->pdu, vs->offset + 4 + vs->count, "S",
&vs->v9stat);
if ((vs->len != (vs->v9stat.size + 2)) ||
((vs->count + vs->len) > vs->max_count)) {
v9fs_do_seekdir(s, vs->fidp->dir, vs->dir_pos);
v9fs_read_post_seekdir(s, vs, err);
return;
}
vs->count += vs->len;
v9fs_stat_free(&vs->v9stat);
v9fs_string_free(&vs->name);
vs->dir_pos = vs->dent->d_off;
vs->dent = v9fs_do_readdir(s, vs->fidp->dir);
v9fs_read_post_readdir(s, vs, err);
return;
out:
v9fs_do_seekdir(s, vs->fidp->dir, vs->dir_pos);
v9fs_read_post_seekdir(s, vs, err);
return;
}
static void v9fs_read_post_readdir(V9fsState *s, V9fsReadState *vs, ssize_t err)
{
if (vs->dent) {
memset(&vs->v9stat, 0, sizeof(vs->v9stat));
v9fs_string_init(&vs->name);
v9fs_string_sprintf(&vs->name, "%s/%s", vs->fidp->path.data,
vs->dent->d_name);
err = v9fs_do_lstat(s, &vs->name, &vs->stbuf);
v9fs_read_post_dir_lstat(s, vs, err);
return;
}
vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count);
vs->offset += vs->count;
err = vs->offset;
complete_pdu(s, vs->pdu, err);
qemu_free(vs);
return;
}
static void v9fs_read_post_telldir(V9fsState *s, V9fsReadState *vs, ssize_t err)
{
vs->dent = v9fs_do_readdir(s, vs->fidp->dir);
v9fs_read_post_readdir(s, vs, err);
return;
}
static void v9fs_read_post_rewinddir(V9fsState *s, V9fsReadState *vs,
ssize_t err)
{
vs->dir_pos = v9fs_do_telldir(s, vs->fidp->dir);
v9fs_read_post_telldir(s, vs, err);
return;
}
static void v9fs_read_post_readv(V9fsState *s, V9fsReadState *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_readv(s, vs->fidp->fd, vs->sg, vs->cnt);
} while (vs->len == -1 && errno == EINTR);
if (vs->len == -1) {
err = -errno;
}
v9fs_read_post_readv(s, vs, err);
return;
}
vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->total);
vs->offset += vs->count;
err = vs->offset;
out:
complete_pdu(s, vs->pdu, err);
qemu_free(vs);
}
static void v9fs_read_post_lseek(V9fsState *s, V9fsReadState *vs, ssize_t err)
{
if (err == -1) {
err = -errno;
goto out;
}
vs->sg = cap_sg(vs->sg, vs->count, &vs->cnt);
if (vs->total < vs->count) {
do {
if (0) {
print_sg(vs->sg, vs->cnt);
}
vs->len = v9fs_do_readv(s, vs->fidp->fd, vs->sg, vs->cnt);
} while (vs->len == -1 && errno == EINTR);
if (vs->len == -1) {
err = -errno;
}
v9fs_read_post_readv(s, vs, err);
return;
}
out:
complete_pdu(s, vs->pdu, err);
qemu_free(vs);
}
static void v9fs_read(V9fsState *s, V9fsPDU *pdu)
{
if (debug_9p_pdu) {
pprint_pdu(pdu);
int32_t fid;
V9fsReadState *vs;
ssize_t err = 0;
vs = qemu_malloc(sizeof(*vs));
vs->pdu = pdu;
vs->offset = 7;
vs->total = 0;
vs->len = 0;
vs->count = 0;
pdu_unmarshal(vs->pdu, vs->offset, "dqd", &fid, &vs->off, &vs->count);
vs->fidp = lookup_fid(s, fid);
if (vs->fidp == NULL) {
err = -EINVAL;
goto out;
}
if (vs->fidp->dir) {
vs->max_count = vs->count;
vs->count = 0;
if (vs->off == 0) {
v9fs_do_rewinddir(s, vs->fidp->dir);
}
v9fs_read_post_rewinddir(s, vs, err);
return;
} else if (vs->fidp->fd != -1) {
vs->sg = vs->iov;
pdu_marshal(vs->pdu, vs->offset + 4, "v", vs->sg, &vs->cnt);
err = v9fs_do_lseek(s, vs->fidp->fd, vs->off, SEEK_SET);
v9fs_read_post_lseek(s, vs, err);
return;
} else {
err = -EINVAL;
}
out:
complete_pdu(s, pdu, err);
qemu_free(vs);
}
static void v9fs_write(V9fsState *s, V9fsPDU *pdu)