From c494dd6f28dbacd855bca894c664bf1f9836afe9 Mon Sep 17 00:00:00 2001 From: Anthony Liguori Date: Thu, 29 Apr 2010 17:44:59 +0530 Subject: [PATCH] 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 Signed-off-by: Aneesh Kumar K.V Signed-off-by: Anthony Liguori --- hw/file-op-9p.h | 8 ++ hw/virtio-9p-local.c | 87 ++++++++++++++ hw/virtio-9p.c | 264 ++++++++++++++++++++++++++++++++++++++++++- 3 files changed, 357 insertions(+), 2 deletions(-) diff --git a/hw/file-op-9p.h b/hw/file-op-9p.h index 12503c1c2d..5049b2ec80 100644 --- a/hw/file-op-9p.h +++ b/hw/file-op-9p.h @@ -29,11 +29,17 @@ typedef struct FileOperations { int (*lstat)(FsContext *, const char *, struct stat *); ssize_t (*readlink)(FsContext *, const char *, char *, size_t); + int (*chmod)(FsContext *, const char *, mode_t); + int (*mknod)(FsContext *, const char *, mode_t, dev_t); + int (*mksock)(FsContext *, const char *); + int (*symlink)(FsContext *, const char *, const char *); + int (*link)(FsContext *, const char *, const char *); int (*setuid)(FsContext *, uid_t); int (*close)(FsContext *, int); int (*closedir)(FsContext *, DIR *); DIR *(*opendir)(FsContext *, const char *); int (*open)(FsContext *, const char *, int); + int (*open2)(FsContext *, const char *, int, mode_t); void (*rewinddir)(FsContext *, DIR *); off_t (*telldir)(FsContext *, DIR *); struct dirent *(*readdir)(FsContext *, DIR *); @@ -41,6 +47,8 @@ typedef struct FileOperations ssize_t (*readv)(FsContext *, int, const struct iovec *, int); ssize_t (*writev)(FsContext *, int, const struct iovec *, int); off_t (*lseek)(FsContext *, int, off_t, int); + int (*mkdir)(FsContext *, const char *, mode_t); + int (*fstat)(FsContext *, int, struct stat *); void *opaque; } FileOperations; #endif diff --git a/hw/virtio-9p-local.c b/hw/virtio-9p-local.c index 87aeba83f1..f6781ca2af 100644 --- a/hw/virtio-9p-local.c +++ b/hw/virtio-9p-local.c @@ -12,8 +12,11 @@ */ #include "virtio.h" #include "virtio-9p.h" +#include #include #include +#include +#include static const char *rpath(FsContext *ctx, const char *path) { @@ -133,6 +136,82 @@ static ssize_t local_writev(FsContext *ctx, int fd, const struct iovec *iov, return writev(fd, iov, iovcnt); } +static int local_chmod(FsContext *ctx, const char *path, mode_t mode) +{ + return chmod(rpath(ctx, path), mode); +} + +static int local_mknod(FsContext *ctx, const char *path, mode_t mode, dev_t dev) +{ + return mknod(rpath(ctx, path), mode, dev); +} + +static int local_mksock(FsContext *ctx2, const char *path) +{ + struct sockaddr_un addr; + int s; + + addr.sun_family = AF_UNIX; + snprintf(addr.sun_path, 108, "%s", rpath(ctx2, path)); + + s = socket(PF_UNIX, SOCK_STREAM, 0); + if (s == -1) { + return -1; + } + + if (bind(s, (struct sockaddr *)&addr, sizeof(addr))) { + close(s); + return -1; + } + + close(s); + return 0; +} + +static int local_mkdir(FsContext *ctx, const char *path, mode_t mode) +{ + return mkdir(rpath(ctx, path), mode); +} + +static int local_fstat(FsContext *ctx, int fd, struct stat *stbuf) +{ + return fstat(fd, stbuf); +} + +static int local_open2(FsContext *ctx, const char *path, int flags, mode_t mode) +{ + return open(rpath(ctx, path), flags, mode); +} + +static int local_symlink(FsContext *ctx, const char *oldpath, + const char *newpath) +{ + return symlink(oldpath, rpath(ctx, newpath)); +} + +static int local_link(FsContext *ctx, const char *oldpath, const char *newpath) +{ + char *tmp = qemu_strdup(rpath(ctx, oldpath)); + int err, serrno = 0; + + if (tmp == NULL) { + return -ENOMEM; + } + + err = link(tmp, rpath(ctx, newpath)); + if (err == -1) { + serrno = errno; + } + + qemu_free(tmp); + + if (err == -1) { + errno = serrno; + } + + return err; +} + FileOperations local_ops = { .lstat = local_lstat, .setuid = local_setuid, @@ -148,4 +227,12 @@ FileOperations local_ops = { .readv = local_readv, .lseek = local_lseek, .writev = local_writev, + .chmod = local_chmod, + .mknod = local_mknod, + .mksock = local_mksock, + .mkdir = local_mkdir, + .fstat = local_fstat, + .open2 = local_open2, + .symlink = local_symlink, + .link = local_link, }; diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c index 252eaa9ec2..bb2a4baa22 100644 --- a/hw/virtio-9p.c +++ b/hw/virtio-9p.c @@ -103,6 +103,47 @@ static int v9fs_do_writev(V9fsState *s, int fd, const struct iovec *iov, return s->ops->writev(&s->ctx, fd, iov, iovcnt); } +static int v9fs_do_chmod(V9fsState *s, V9fsString *path, mode_t mode) +{ + return s->ops->chmod(&s->ctx, path->data, mode); +} + +static int v9fs_do_mknod(V9fsState *s, V9fsString *path, mode_t mode, dev_t dev) +{ + return s->ops->mknod(&s->ctx, path->data, mode, dev); +} + +static int v9fs_do_mksock(V9fsState *s, V9fsString *path) +{ + return s->ops->mksock(&s->ctx, path->data); +} + +static int v9fs_do_mkdir(V9fsState *s, V9fsString *path, mode_t mode) +{ + return s->ops->mkdir(&s->ctx, path->data, mode); +} + +static int v9fs_do_fstat(V9fsState *s, int fd, struct stat *stbuf) +{ + return s->ops->fstat(&s->ctx, fd, stbuf); +} + +static int v9fs_do_open2(V9fsState *s, V9fsString *path, int flags, mode_t mode) +{ + return s->ops->open2(&s->ctx, path->data, flags, mode); +} + +static int v9fs_do_symlink(V9fsState *s, V9fsString *oldpath, + V9fsString *newpath) +{ + return s->ops->symlink(&s->ctx, oldpath->data, newpath->data); +} + +static int v9fs_do_link(V9fsState *s, V9fsString *oldpath, V9fsString *newpath) +{ + return s->ops->link(&s->ctx, oldpath->data, newpath->data); +} + static void v9fs_string_init(V9fsString *str) { str->data = NULL; @@ -1649,11 +1690,230 @@ out: qemu_free(vs); } +typedef struct V9fsCreateState { + V9fsPDU *pdu; + size_t offset; + V9fsFidState *fidp; + V9fsQID qid; + int32_t perm; + int8_t mode; + struct stat stbuf; + V9fsString name; + V9fsString extension; + V9fsString fullname; +} V9fsCreateState; + +static void v9fs_post_create(V9fsState *s, V9fsCreateState *vs, int err) +{ + if (err == 0) { + v9fs_string_copy(&vs->fidp->path, &vs->fullname); + stat_to_qid(&vs->stbuf, &vs->qid); + + vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, 0); + + err = vs->offset; + } + + complete_pdu(s, vs->pdu, err); + v9fs_string_free(&vs->name); + v9fs_string_free(&vs->extension); + v9fs_string_free(&vs->fullname); + qemu_free(vs); +} + +static void v9fs_create_post_perms(V9fsState *s, V9fsCreateState *vs, int err) +{ + if (err) { + err = -errno; + } + v9fs_post_create(s, vs, err); +} + +static void v9fs_create_post_opendir(V9fsState *s, V9fsCreateState *vs, + int err) +{ + if (!vs->fidp->dir) { + err = -errno; + } + v9fs_post_create(s, vs, err); +} + +static void v9fs_create_post_dir_lstat(V9fsState *s, V9fsCreateState *vs, + int err) +{ + if (err) { + err = -errno; + goto out; + } + + vs->fidp->dir = v9fs_do_opendir(s, &vs->fullname); + v9fs_create_post_opendir(s, vs, err); + return; + +out: + v9fs_post_create(s, vs, err); +} + +static void v9fs_create_post_mkdir(V9fsState *s, V9fsCreateState *vs, int err) +{ + if (err) { + err = -errno; + goto out; + } + + err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf); + v9fs_create_post_dir_lstat(s, vs, err); + return; + +out: + v9fs_post_create(s, vs, err); +} + +static void v9fs_create_post_mksock(V9fsState *s, V9fsCreateState *vs, + int err) +{ + if (err) { + err = -errno; + goto out; + } + + err = v9fs_do_chmod(s, &vs->fullname, vs->perm & 0777); + v9fs_create_post_perms(s, vs, err); + return; + +out: + v9fs_post_create(s, vs, err); +} + +static void v9fs_create_post_fstat(V9fsState *s, V9fsCreateState *vs, int err) +{ + if (err) { + vs->fidp->fd = -1; + err = -errno; + } + + v9fs_post_create(s, vs, err); + return; +} + +static void v9fs_create_post_open2(V9fsState *s, V9fsCreateState *vs, int err) +{ + if (vs->fidp->fd == -1) { + err = -errno; + goto out; + } + + err = v9fs_do_fstat(s, vs->fidp->fd, &vs->stbuf); + v9fs_create_post_fstat(s, vs, err); + + return; + +out: + v9fs_post_create(s, vs, err); + +} + +static void v9fs_create_post_lstat(V9fsState *s, V9fsCreateState *vs, int err) +{ + + if (err == 0 || errno != ENOENT) { + err = -errno; + goto out; + } + + if (vs->perm & P9_STAT_MODE_DIR) { + err = v9fs_do_mkdir(s, &vs->fullname, vs->perm & 0777); + v9fs_create_post_mkdir(s, vs, err); + } else if (vs->perm & P9_STAT_MODE_SYMLINK) { + err = v9fs_do_symlink(s, &vs->extension, &vs->fullname); + v9fs_create_post_perms(s, vs, err); + } else if (vs->perm & P9_STAT_MODE_LINK) { + int32_t nfid = atoi(vs->extension.data); + V9fsFidState *nfidp = lookup_fid(s, nfid); + if (nfidp == NULL) { + err = -errno; + v9fs_post_create(s, vs, err); + } + err = v9fs_do_link(s, &nfidp->path, &vs->fullname); + v9fs_create_post_perms(s, vs, err); + } else if (vs->perm & P9_STAT_MODE_DEVICE) { + char ctype; + uint32_t major, minor; + mode_t nmode = 0; + + if (sscanf(vs->extension.data, "%c %u %u", &ctype, &major, + &minor) != 3) { + err = -errno; + v9fs_post_create(s, vs, err); + } + + switch (ctype) { + case 'c': + nmode = S_IFCHR; + break; + case 'b': + nmode = S_IFBLK; + break; + default: + err = -EIO; + v9fs_post_create(s, vs, err); + } + + nmode |= vs->perm & 0777; + err = v9fs_do_mknod(s, &vs->fullname, nmode, makedev(major, minor)); + v9fs_create_post_perms(s, vs, err); + } else if (vs->perm & P9_STAT_MODE_NAMED_PIPE) { + err = v9fs_do_mknod(s, &vs->fullname, S_IFIFO | (vs->mode & 0777), 0); + v9fs_post_create(s, vs, err); + } else if (vs->perm & P9_STAT_MODE_SOCKET) { + err = v9fs_do_mksock(s, &vs->fullname); + v9fs_create_post_mksock(s, vs, err); + } else { + vs->fidp->fd = v9fs_do_open2(s, &vs->fullname, + omode_to_uflags(vs->mode) | O_CREAT, + vs->perm & 0777); + v9fs_create_post_open2(s, vs, err); + } + + return; + +out: + v9fs_post_create(s, vs, err); +} + static void v9fs_create(V9fsState *s, V9fsPDU *pdu) { - if (debug_9p_pdu) { - pprint_pdu(pdu); + int32_t fid; + V9fsCreateState *vs; + int err = 0; + + vs = qemu_malloc(sizeof(*vs)); + vs->pdu = pdu; + vs->offset = 7; + + v9fs_string_init(&vs->fullname); + + pdu_unmarshal(vs->pdu, vs->offset, "dsdbs", &fid, &vs->name, + &vs->perm, &vs->mode, &vs->extension); + + vs->fidp = lookup_fid(s, fid); + if (vs->fidp == NULL) { + err = -EINVAL; + goto out; } + + v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->fidp->path.data, + vs->name.data); + + err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf); + v9fs_create_post_lstat(s, vs, err); + return; + +out: + complete_pdu(s, vs->pdu, err); + v9fs_string_free(&vs->name); + v9fs_string_free(&vs->extension); + qemu_free(vs); } static void v9fs_flush(V9fsState *s, V9fsPDU *pdu)