virtio-9p: Add P9_TCREATE support
Implement P9_TCREATE support. [jvrao@linux.vnet.ibm.com: strdup to qemu_strdup conversion] 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
8449360cbd
commit
c494dd6f28
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@ -29,11 +29,17 @@ typedef struct FileOperations
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{
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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 (*mknod)(FsContext *, const char *, mode_t, dev_t);
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int (*mksock)(FsContext *, const char *);
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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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int (*close)(FsContext *, int);
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int (*closedir)(FsContext *, DIR *);
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DIR *(*opendir)(FsContext *, const char *);
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int (*open)(FsContext *, const char *, int);
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int (*open2)(FsContext *, const char *, int, mode_t);
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void (*rewinddir)(FsContext *, DIR *);
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off_t (*telldir)(FsContext *, DIR *);
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struct dirent *(*readdir)(FsContext *, DIR *);
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@ -41,6 +47,8 @@ typedef struct FileOperations
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ssize_t (*readv)(FsContext *, int, const struct iovec *, int);
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ssize_t (*writev)(FsContext *, int, const struct iovec *, int);
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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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void *opaque;
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} FileOperations;
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#endif
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@ -12,8 +12,11 @@
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*/
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#include "virtio.h"
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#include "virtio-9p.h"
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#include <arpa/inet.h>
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#include <pwd.h>
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#include <grp.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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static const char *rpath(FsContext *ctx, const char *path)
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{
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@ -133,6 +136,82 @@ static ssize_t local_writev(FsContext *ctx, int fd, const struct iovec *iov,
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return writev(fd, iov, iovcnt);
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}
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static int local_chmod(FsContext *ctx, const char *path, mode_t mode)
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{
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return chmod(rpath(ctx, path), mode);
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}
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static int local_mknod(FsContext *ctx, const char *path, mode_t mode, dev_t dev)
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{
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return mknod(rpath(ctx, path), mode, dev);
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}
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static int local_mksock(FsContext *ctx2, const char *path)
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{
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struct sockaddr_un addr;
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int s;
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addr.sun_family = AF_UNIX;
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snprintf(addr.sun_path, 108, "%s", rpath(ctx2, path));
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s = socket(PF_UNIX, SOCK_STREAM, 0);
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if (s == -1) {
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return -1;
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}
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if (bind(s, (struct sockaddr *)&addr, sizeof(addr))) {
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close(s);
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return -1;
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}
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close(s);
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return 0;
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}
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static int local_mkdir(FsContext *ctx, const char *path, mode_t mode)
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{
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return mkdir(rpath(ctx, path), mode);
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}
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static int local_fstat(FsContext *ctx, int fd, struct stat *stbuf)
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{
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return fstat(fd, stbuf);
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}
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static int local_open2(FsContext *ctx, const char *path, int flags, mode_t mode)
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{
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return open(rpath(ctx, path), flags, mode);
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}
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static int local_symlink(FsContext *ctx, const char *oldpath,
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const char *newpath)
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{
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return symlink(oldpath, rpath(ctx, newpath));
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}
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static int local_link(FsContext *ctx, const char *oldpath, const char *newpath)
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{
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char *tmp = qemu_strdup(rpath(ctx, oldpath));
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int err, serrno = 0;
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if (tmp == NULL) {
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return -ENOMEM;
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}
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err = link(tmp, rpath(ctx, newpath));
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if (err == -1) {
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serrno = errno;
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}
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qemu_free(tmp);
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if (err == -1) {
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errno = serrno;
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}
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return err;
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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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@ -148,4 +227,12 @@ FileOperations local_ops = {
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.readv = local_readv,
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.lseek = local_lseek,
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.writev = local_writev,
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.chmod = local_chmod,
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.mknod = local_mknod,
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.mksock = local_mksock,
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.mkdir = local_mkdir,
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.fstat = local_fstat,
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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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};
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264
hw/virtio-9p.c
264
hw/virtio-9p.c
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@ -103,6 +103,47 @@ static int v9fs_do_writev(V9fsState *s, int fd, const struct iovec *iov,
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return s->ops->writev(&s->ctx, fd, iov, iovcnt);
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}
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static int v9fs_do_chmod(V9fsState *s, V9fsString *path, mode_t mode)
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{
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return s->ops->chmod(&s->ctx, path->data, mode);
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}
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static int v9fs_do_mknod(V9fsState *s, V9fsString *path, mode_t mode, dev_t dev)
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{
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return s->ops->mknod(&s->ctx, path->data, mode, dev);
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}
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static int v9fs_do_mksock(V9fsState *s, V9fsString *path)
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{
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return s->ops->mksock(&s->ctx, path->data);
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}
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static int v9fs_do_mkdir(V9fsState *s, V9fsString *path, mode_t mode)
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{
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return s->ops->mkdir(&s->ctx, path->data, mode);
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}
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static int v9fs_do_fstat(V9fsState *s, int fd, struct stat *stbuf)
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{
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return s->ops->fstat(&s->ctx, fd, stbuf);
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}
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static int v9fs_do_open2(V9fsState *s, V9fsString *path, int flags, mode_t mode)
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{
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return s->ops->open2(&s->ctx, path->data, flags, mode);
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}
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static int v9fs_do_symlink(V9fsState *s, V9fsString *oldpath,
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V9fsString *newpath)
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{
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return s->ops->symlink(&s->ctx, oldpath->data, newpath->data);
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}
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static int v9fs_do_link(V9fsState *s, V9fsString *oldpath, V9fsString *newpath)
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{
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return s->ops->link(&s->ctx, oldpath->data, newpath->data);
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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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@ -1649,11 +1690,230 @@ out:
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qemu_free(vs);
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}
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typedef struct V9fsCreateState {
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V9fsPDU *pdu;
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size_t offset;
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V9fsFidState *fidp;
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V9fsQID qid;
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int32_t perm;
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int8_t mode;
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struct stat stbuf;
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V9fsString name;
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V9fsString extension;
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V9fsString fullname;
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} V9fsCreateState;
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static void v9fs_post_create(V9fsState *s, V9fsCreateState *vs, int err)
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{
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if (err == 0) {
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v9fs_string_copy(&vs->fidp->path, &vs->fullname);
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stat_to_qid(&vs->stbuf, &vs->qid);
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vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, 0);
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err = vs->offset;
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}
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complete_pdu(s, vs->pdu, err);
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v9fs_string_free(&vs->name);
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v9fs_string_free(&vs->extension);
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v9fs_string_free(&vs->fullname);
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qemu_free(vs);
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}
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static void v9fs_create_post_perms(V9fsState *s, V9fsCreateState *vs, int err)
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{
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if (err) {
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err = -errno;
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}
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v9fs_post_create(s, vs, err);
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}
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static void v9fs_create_post_opendir(V9fsState *s, V9fsCreateState *vs,
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int err)
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{
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if (!vs->fidp->dir) {
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err = -errno;
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}
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v9fs_post_create(s, vs, err);
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}
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static void v9fs_create_post_dir_lstat(V9fsState *s, V9fsCreateState *vs,
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int 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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vs->fidp->dir = v9fs_do_opendir(s, &vs->fullname);
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v9fs_create_post_opendir(s, vs, err);
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return;
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out:
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v9fs_post_create(s, vs, err);
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}
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static void v9fs_create_post_mkdir(V9fsState *s, V9fsCreateState *vs, int 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 = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
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v9fs_create_post_dir_lstat(s, vs, err);
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return;
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out:
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v9fs_post_create(s, vs, err);
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}
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static void v9fs_create_post_mksock(V9fsState *s, V9fsCreateState *vs,
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int 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 = v9fs_do_chmod(s, &vs->fullname, vs->perm & 0777);
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v9fs_create_post_perms(s, vs, err);
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return;
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out:
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v9fs_post_create(s, vs, err);
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}
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static void v9fs_create_post_fstat(V9fsState *s, V9fsCreateState *vs, int err)
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{
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if (err) {
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vs->fidp->fd = -1;
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err = -errno;
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}
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v9fs_post_create(s, vs, err);
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return;
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}
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static void v9fs_create_post_open2(V9fsState *s, V9fsCreateState *vs, int err)
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{
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if (vs->fidp->fd == -1) {
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err = -errno;
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goto out;
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}
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err = v9fs_do_fstat(s, vs->fidp->fd, &vs->stbuf);
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v9fs_create_post_fstat(s, vs, err);
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return;
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out:
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v9fs_post_create(s, vs, err);
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}
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static void v9fs_create_post_lstat(V9fsState *s, V9fsCreateState *vs, int err)
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{
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if (err == 0 || errno != ENOENT) {
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err = -errno;
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goto out;
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}
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if (vs->perm & P9_STAT_MODE_DIR) {
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err = v9fs_do_mkdir(s, &vs->fullname, vs->perm & 0777);
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v9fs_create_post_mkdir(s, vs, err);
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} else if (vs->perm & P9_STAT_MODE_SYMLINK) {
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err = v9fs_do_symlink(s, &vs->extension, &vs->fullname);
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v9fs_create_post_perms(s, vs, err);
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} else if (vs->perm & P9_STAT_MODE_LINK) {
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int32_t nfid = atoi(vs->extension.data);
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V9fsFidState *nfidp = lookup_fid(s, nfid);
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if (nfidp == NULL) {
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err = -errno;
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v9fs_post_create(s, vs, err);
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}
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err = v9fs_do_link(s, &nfidp->path, &vs->fullname);
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v9fs_create_post_perms(s, vs, err);
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} else if (vs->perm & P9_STAT_MODE_DEVICE) {
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char ctype;
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uint32_t major, minor;
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mode_t nmode = 0;
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if (sscanf(vs->extension.data, "%c %u %u", &ctype, &major,
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&minor) != 3) {
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err = -errno;
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v9fs_post_create(s, vs, err);
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}
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switch (ctype) {
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case 'c':
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nmode = S_IFCHR;
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break;
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case 'b':
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nmode = S_IFBLK;
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break;
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default:
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err = -EIO;
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v9fs_post_create(s, vs, err);
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}
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nmode |= vs->perm & 0777;
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err = v9fs_do_mknod(s, &vs->fullname, nmode, makedev(major, minor));
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v9fs_create_post_perms(s, vs, err);
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} else if (vs->perm & P9_STAT_MODE_NAMED_PIPE) {
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err = v9fs_do_mknod(s, &vs->fullname, S_IFIFO | (vs->mode & 0777), 0);
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v9fs_post_create(s, vs, err);
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} else if (vs->perm & P9_STAT_MODE_SOCKET) {
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err = v9fs_do_mksock(s, &vs->fullname);
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v9fs_create_post_mksock(s, vs, err);
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} else {
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vs->fidp->fd = v9fs_do_open2(s, &vs->fullname,
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omode_to_uflags(vs->mode) | O_CREAT,
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vs->perm & 0777);
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v9fs_create_post_open2(s, vs, err);
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}
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return;
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out:
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v9fs_post_create(s, vs, err);
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}
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static void v9fs_create(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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V9fsCreateState *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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v9fs_string_init(&vs->fullname);
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pdu_unmarshal(vs->pdu, vs->offset, "dsdbs", &fid, &vs->name,
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&vs->perm, &vs->mode, &vs->extension);
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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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v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->fidp->path.data,
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vs->name.data);
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err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
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v9fs_create_post_lstat(s, vs, err);
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return;
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out:
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complete_pdu(s, vs->pdu, err);
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v9fs_string_free(&vs->name);
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v9fs_string_free(&vs->extension);
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qemu_free(vs);
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}
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static void v9fs_flush(V9fsState *s, V9fsPDU *pdu)
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