mirror of https://gitee.com/openkylin/qemu.git
virtio-9p: Add P9_TWSTAT support
Implement P9_TWSTAT support. This gets file and directory creation to work. [jvrao@linux.vnet.ibm.com: strdup to qemu_strdup conversion] [aneesh.kumar@linux.vnet.ibm.com: v9fs_fix_path] 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
parent
c494dd6f28
commit
8cf89e007a
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@ -30,8 +30,10 @@ typedef struct FileOperations
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int (*lstat)(FsContext *, const char *, struct stat *);
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ssize_t (*readlink)(FsContext *, const char *, char *, size_t);
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int (*chmod)(FsContext *, const char *, mode_t);
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int (*chown)(FsContext *, const char *, uid_t, gid_t);
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int (*mknod)(FsContext *, const char *, mode_t, dev_t);
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int (*mksock)(FsContext *, const char *);
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int (*utime)(FsContext *, const char *, const struct utimbuf *);
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int (*symlink)(FsContext *, const char *, const char *);
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int (*link)(FsContext *, const char *, const char *);
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int (*setuid)(FsContext *, uid_t);
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@ -49,6 +51,9 @@ typedef struct FileOperations
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off_t (*lseek)(FsContext *, int, off_t, int);
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int (*mkdir)(FsContext *, const char *, mode_t);
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int (*fstat)(FsContext *, int, struct stat *);
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int (*rename)(FsContext *, const char *, const char *);
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int (*truncate)(FsContext *, const char *, off_t);
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int (*fsync)(FsContext *, int);
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void *opaque;
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} FileOperations;
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#endif
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@ -212,6 +212,51 @@ static int local_link(FsContext *ctx, const char *oldpath, const char *newpath)
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return err;
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}
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static int local_truncate(FsContext *ctx, const char *path, off_t size)
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{
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return truncate(rpath(ctx, path), size);
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}
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static int local_rename(FsContext *ctx, const char *oldpath,
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const char *newpath)
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{
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char *tmp;
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int err;
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tmp = qemu_strdup(rpath(ctx, oldpath));
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if (tmp == NULL) {
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return -1;
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}
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err = rename(tmp, rpath(ctx, newpath));
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if (err == -1) {
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int serrno = errno;
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qemu_free(tmp);
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errno = serrno;
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} else {
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qemu_free(tmp);
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}
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return err;
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}
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static int local_chown(FsContext *ctx, const char *path, uid_t uid, gid_t gid)
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{
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return chown(rpath(ctx, path), uid, gid);
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}
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static int local_utime(FsContext *ctx, const char *path,
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const struct utimbuf *buf)
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{
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return utime(rpath(ctx, path), buf);
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}
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static int local_fsync(FsContext *ctx, int fd)
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{
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return fsync(fd);
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}
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FileOperations local_ops = {
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.lstat = local_lstat,
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.setuid = local_setuid,
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@ -235,4 +280,9 @@ FileOperations local_ops = {
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.open2 = local_open2,
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.symlink = local_symlink,
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.link = local_link,
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.truncate = local_truncate,
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.rename = local_rename,
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.chown = local_chown,
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.utime = local_utime,
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.fsync = local_fsync,
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};
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273
hw/virtio-9p.c
273
hw/virtio-9p.c
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@ -144,6 +144,33 @@ static int v9fs_do_link(V9fsState *s, V9fsString *oldpath, V9fsString *newpath)
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return s->ops->link(&s->ctx, oldpath->data, newpath->data);
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}
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static int v9fs_do_truncate(V9fsState *s, V9fsString *path, off_t size)
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{
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return s->ops->truncate(&s->ctx, path->data, size);
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}
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static int v9fs_do_rename(V9fsState *s, V9fsString *oldpath,
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V9fsString *newpath)
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{
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return s->ops->rename(&s->ctx, oldpath->data, newpath->data);
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}
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static int v9fs_do_chown(V9fsState *s, V9fsString *path, uid_t uid, gid_t gid)
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{
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return s->ops->chown(&s->ctx, path->data, uid, gid);
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}
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static int v9fs_do_utime(V9fsState *s, V9fsString *path,
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const struct utimbuf *buf)
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{
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return s->ops->utime(&s->ctx, path->data, buf);
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}
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static int v9fs_do_fsync(V9fsState *s, int fd)
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{
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return s->ops->fsync(&s->ctx, fd);
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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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@ -929,6 +956,15 @@ static void v9fs_dummy(V9fsState *s, V9fsPDU *pdu)
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(void) print_sg;
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}
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static void v9fs_fix_path(V9fsString *dst, V9fsString *src, int len)
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{
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V9fsString str;
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v9fs_string_init(&str);
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v9fs_string_copy(&str, dst);
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v9fs_string_sprintf(dst, "%s%s", src->data, str.data+len);
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v9fs_string_free(&str);
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}
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static void v9fs_version(V9fsState *s, V9fsPDU *pdu)
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{
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int32_t msize;
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@ -1931,11 +1967,244 @@ static void v9fs_remove(V9fsState *s, V9fsPDU *pdu)
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}
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}
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typedef struct V9fsWstatState
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{
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V9fsPDU *pdu;
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size_t offset;
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int16_t unused;
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V9fsStat v9stat;
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V9fsFidState *fidp;
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struct stat stbuf;
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V9fsString nname;
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} V9fsWstatState;
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static void v9fs_wstat_post_truncate(V9fsState *s, V9fsWstatState *vs, int err)
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{
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if (err < 0) {
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goto out;
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}
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err = vs->offset;
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out:
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v9fs_stat_free(&vs->v9stat);
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complete_pdu(s, vs->pdu, err);
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qemu_free(vs);
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}
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static void v9fs_wstat_post_rename(V9fsState *s, V9fsWstatState *vs, int err)
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{
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if (err < 0) {
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goto out;
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}
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if (vs->v9stat.name.size != 0) {
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v9fs_string_free(&vs->nname);
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}
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if (vs->v9stat.length != -1) {
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if (v9fs_do_truncate(s, &vs->fidp->path, vs->v9stat.length) < 0) {
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err = -errno;
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}
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}
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v9fs_wstat_post_truncate(s, vs, err);
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return;
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out:
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v9fs_stat_free(&vs->v9stat);
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complete_pdu(s, vs->pdu, err);
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qemu_free(vs);
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}
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static void v9fs_wstat_post_chown(V9fsState *s, V9fsWstatState *vs, int err)
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{
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V9fsFidState *fidp;
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if (err < 0) {
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goto out;
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}
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if (vs->v9stat.name.size != 0) {
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char *old_name, *new_name;
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char *end;
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old_name = vs->fidp->path.data;
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end = strrchr(old_name, '/');
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if (end) {
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end++;
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} else {
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end = old_name;
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}
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new_name = qemu_malloc(end - old_name + vs->v9stat.name.size + 1);
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memset(new_name, 0, end - old_name + vs->v9stat.name.size + 1);
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memcpy(new_name, old_name, end - old_name);
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memcpy(new_name + (end - old_name), vs->v9stat.name.data,
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vs->v9stat.name.size);
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vs->nname.data = new_name;
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vs->nname.size = strlen(new_name);
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if (strcmp(new_name, vs->fidp->path.data) != 0) {
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if (v9fs_do_rename(s, &vs->fidp->path, &vs->nname)) {
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err = -errno;
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} else {
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/*
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* Fixup fid's pointing to the old name to
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* start pointing to the new name
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*/
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for (fidp = s->fid_list; fidp; fidp = fidp->next) {
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if (vs->fidp == fidp) {
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/*
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* we replace name of this fid towards the end
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* so that our below strcmp will work
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*/
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continue;
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}
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if (!strncmp(vs->fidp->path.data, fidp->path.data,
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strlen(vs->fidp->path.data))) {
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/* replace the name */
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v9fs_fix_path(&fidp->path, &vs->nname,
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strlen(vs->fidp->path.data));
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}
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}
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v9fs_string_copy(&vs->fidp->path, &vs->nname);
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}
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}
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}
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v9fs_wstat_post_rename(s, vs, err);
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return;
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out:
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v9fs_stat_free(&vs->v9stat);
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complete_pdu(s, vs->pdu, err);
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qemu_free(vs);
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}
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static void v9fs_wstat_post_utime(V9fsState *s, V9fsWstatState *vs, int err)
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{
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if (err < 0) {
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goto out;
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}
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if (vs->v9stat.n_gid != -1) {
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if (v9fs_do_chown(s, &vs->fidp->path, vs->v9stat.n_uid,
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vs->v9stat.n_gid)) {
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err = -errno;
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}
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}
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v9fs_wstat_post_chown(s, vs, err);
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return;
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out:
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v9fs_stat_free(&vs->v9stat);
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complete_pdu(s, vs->pdu, err);
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qemu_free(vs);
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}
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static void v9fs_wstat_post_chmod(V9fsState *s, V9fsWstatState *vs, int err)
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{
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if (err < 0) {
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goto out;
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}
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if (vs->v9stat.mtime != -1) {
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struct utimbuf tb;
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tb.actime = 0;
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tb.modtime = vs->v9stat.mtime;
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if (v9fs_do_utime(s, &vs->fidp->path, &tb)) {
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err = -errno;
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}
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}
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v9fs_wstat_post_utime(s, vs, err);
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return;
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out:
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v9fs_stat_free(&vs->v9stat);
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complete_pdu(s, vs->pdu, err);
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qemu_free(vs);
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}
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static void v9fs_wstat_post_fsync(V9fsState *s, V9fsWstatState *vs, int err)
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{
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if (err == -1) {
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err = -errno;
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}
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v9fs_stat_free(&vs->v9stat);
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complete_pdu(s, vs->pdu, err);
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qemu_free(vs);
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}
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static void v9fs_wstat_post_lstat(V9fsState *s, V9fsWstatState *vs, int err)
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{
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uint32_t v9_mode;
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if (err == -1) {
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err = -errno;
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goto out;
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}
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v9_mode = stat_to_v9mode(&vs->stbuf);
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if ((vs->v9stat.mode & P9_STAT_MODE_TYPE_BITS) !=
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(v9_mode & P9_STAT_MODE_TYPE_BITS)) {
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/* Attempting to change the type */
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err = -EIO;
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goto out;
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}
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if (v9fs_do_chmod(s, &vs->fidp->path, v9mode_to_mode(vs->v9stat.mode,
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&vs->v9stat.extension))) {
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err = -errno;
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}
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v9fs_wstat_post_chmod(s, vs, err);
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return;
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out:
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v9fs_stat_free(&vs->v9stat);
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complete_pdu(s, vs->pdu, err);
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qemu_free(vs);
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}
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static void v9fs_wstat(V9fsState *s, V9fsPDU *pdu)
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{
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if (debug_9p_pdu) {
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pprint_pdu(pdu);
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int32_t fid;
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V9fsWstatState *vs;
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int err = 0;
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vs = qemu_malloc(sizeof(*vs));
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vs->pdu = pdu;
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vs->offset = 7;
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pdu_unmarshal(pdu, vs->offset, "dwS", &fid, &vs->unused, &vs->v9stat);
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vs->fidp = lookup_fid(s, fid);
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if (vs->fidp == NULL) {
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err = -EINVAL;
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goto out;
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}
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/* do we need to sync the file? */
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if (donttouch_stat(&vs->v9stat)) {
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err = v9fs_do_fsync(s, vs->fidp->fd);
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v9fs_wstat_post_fsync(s, vs, err);
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return;
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}
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if (vs->v9stat.mode != -1) {
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err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf);
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v9fs_wstat_post_lstat(s, vs, err);
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return;
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}
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v9fs_wstat_post_chmod(s, vs, err);
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return;
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out:
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v9fs_stat_free(&vs->v9stat);
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complete_pdu(s, vs->pdu, err);
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qemu_free(vs);
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}
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typedef void (pdu_handler_t)(V9fsState *s, V9fsPDU *pdu);
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