| /* |
| * Virtio 9p backend |
| * |
| * Copyright IBM, Corp. 2010 |
| * |
| * Authors: |
| * Anthony Liguori <aliguori@us.ibm.com> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2. See |
| * the COPYING file in the top-level directory. |
| * |
| */ |
| |
| #include "virtio.h" |
| #include "pc.h" |
| #include "qemu_socket.h" |
| #include "virtio-9p.h" |
| #include "fsdev/qemu-fsdev.h" |
| #include "virtio-9p-debug.h" |
| |
| int dotu = 1; |
| int debug_9p_pdu; |
| |
| enum { |
| Oread = 0x00, |
| Owrite = 0x01, |
| Ordwr = 0x02, |
| Oexec = 0x03, |
| Oexcl = 0x04, |
| Otrunc = 0x10, |
| Orexec = 0x20, |
| Orclose = 0x40, |
| Oappend = 0x80, |
| }; |
| |
| static int omode_to_uflags(int8_t mode) |
| { |
| int ret = 0; |
| |
| switch (mode & 3) { |
| case Oread: |
| ret = O_RDONLY; |
| break; |
| case Ordwr: |
| ret = O_RDWR; |
| break; |
| case Owrite: |
| ret = O_WRONLY; |
| break; |
| case Oexec: |
| ret = O_RDONLY; |
| break; |
| } |
| |
| if (mode & Otrunc) { |
| ret |= O_TRUNC; |
| } |
| |
| if (mode & Oappend) { |
| ret |= O_APPEND; |
| } |
| |
| if (mode & Oexcl) { |
| ret |= O_EXCL; |
| } |
| |
| return ret; |
| } |
| |
| void cred_init(FsCred *credp) |
| { |
| credp->fc_uid = -1; |
| credp->fc_gid = -1; |
| credp->fc_mode = -1; |
| credp->fc_rdev = -1; |
| } |
| |
| static int v9fs_do_lstat(V9fsState *s, V9fsString *path, struct stat *stbuf) |
| { |
| return s->ops->lstat(&s->ctx, path->data, stbuf); |
| } |
| |
| static ssize_t v9fs_do_readlink(V9fsState *s, V9fsString *path, V9fsString *buf) |
| { |
| ssize_t len; |
| |
| buf->data = qemu_malloc(1024); |
| |
| len = s->ops->readlink(&s->ctx, path->data, buf->data, 1024 - 1); |
| if (len > -1) { |
| buf->size = len; |
| buf->data[len] = 0; |
| } |
| |
| return len; |
| } |
| |
| static int v9fs_do_close(V9fsState *s, int fd) |
| { |
| return s->ops->close(&s->ctx, fd); |
| } |
| |
| static int v9fs_do_closedir(V9fsState *s, DIR *dir) |
| { |
| return s->ops->closedir(&s->ctx, dir); |
| } |
| |
| static int v9fs_do_open(V9fsState *s, V9fsString *path, int flags) |
| { |
| return s->ops->open(&s->ctx, path->data, flags); |
| } |
| |
| 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 int v9fs_do_writev(V9fsState *s, int fd, const struct iovec *iov, |
| int iovcnt) |
| { |
| return s->ops->writev(&s->ctx, fd, iov, iovcnt); |
| } |
| |
| static int v9fs_do_chmod(V9fsState *s, V9fsString *path, mode_t mode) |
| { |
| FsCred cred; |
| cred_init(&cred); |
| cred.fc_mode = mode; |
| return s->ops->chmod(&s->ctx, path->data, &cred); |
| } |
| |
| 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 int v9fs_do_truncate(V9fsState *s, V9fsString *path, off_t size) |
| { |
| return s->ops->truncate(&s->ctx, path->data, size); |
| } |
| |
| static int v9fs_do_rename(V9fsState *s, V9fsString *oldpath, |
| V9fsString *newpath) |
| { |
| return s->ops->rename(&s->ctx, oldpath->data, newpath->data); |
| } |
| |
| static int v9fs_do_chown(V9fsState *s, V9fsString *path, uid_t uid, gid_t gid) |
| { |
| return s->ops->chown(&s->ctx, path->data, uid, gid); |
| } |
| |
| static int v9fs_do_utime(V9fsState *s, V9fsString *path, |
| const struct utimbuf *buf) |
| { |
| return s->ops->utime(&s->ctx, path->data, buf); |
| } |
| |
| static int v9fs_do_remove(V9fsState *s, V9fsString *path) |
| { |
| return s->ops->remove(&s->ctx, path->data); |
| } |
| |
| static int v9fs_do_fsync(V9fsState *s, int fd) |
| { |
| return s->ops->fsync(&s->ctx, fd); |
| } |
| |
| static void v9fs_string_init(V9fsString *str) |
| { |
| str->data = NULL; |
| str->size = 0; |
| } |
| |
| static void v9fs_string_free(V9fsString *str) |
| { |
| qemu_free(str->data); |
| str->data = NULL; |
| str->size = 0; |
| } |
| |
| static void v9fs_string_null(V9fsString *str) |
| { |
| v9fs_string_free(str); |
| } |
| |
| static int number_to_string(void *arg, char type) |
| { |
| unsigned int ret = 0; |
| |
| switch (type) { |
| case 'u': { |
| unsigned int num = *(unsigned int *)arg; |
| |
| do { |
| ret++; |
| num = num/10; |
| } while (num); |
| break; |
| } |
| default: |
| printf("Number_to_string: Unknown number format\n"); |
| return -1; |
| } |
| |
| return ret; |
| } |
| |
| static int v9fs_string_alloc_printf(char **strp, const char *fmt, va_list ap) |
| { |
| va_list ap2; |
| char *iter = (char *)fmt; |
| int len = 0; |
| int nr_args = 0; |
| char *arg_char_ptr; |
| unsigned int arg_uint; |
| |
| /* Find the number of %'s that denotes an argument */ |
| for (iter = strstr(iter, "%"); iter; iter = strstr(iter, "%")) { |
| nr_args++; |
| iter++; |
| } |
| |
| len = strlen(fmt) - 2*nr_args; |
| |
| if (!nr_args) { |
| goto alloc_print; |
| } |
| |
| va_copy(ap2, ap); |
| |
| iter = (char *)fmt; |
| |
| /* Now parse the format string */ |
| for (iter = strstr(iter, "%"); iter; iter = strstr(iter, "%")) { |
| iter++; |
| switch (*iter) { |
| case 'u': |
| arg_uint = va_arg(ap2, unsigned int); |
| len += number_to_string((void *)&arg_uint, 'u'); |
| break; |
| case 's': |
| arg_char_ptr = va_arg(ap2, char *); |
| len += strlen(arg_char_ptr); |
| break; |
| case 'c': |
| len += 1; |
| break; |
| default: |
| fprintf(stderr, |
| "v9fs_string_alloc_printf:Incorrect format %c", *iter); |
| return -1; |
| } |
| iter++; |
| } |
| |
| alloc_print: |
| *strp = qemu_malloc((len + 1) * sizeof(**strp)); |
| |
| return vsprintf(*strp, fmt, ap); |
| } |
| |
| static void v9fs_string_sprintf(V9fsString *str, const char *fmt, ...) |
| { |
| va_list ap; |
| int err; |
| |
| v9fs_string_free(str); |
| |
| va_start(ap, fmt); |
| err = v9fs_string_alloc_printf(&str->data, fmt, ap); |
| BUG_ON(err == -1); |
| va_end(ap); |
| |
| str->size = err; |
| } |
| |
| static void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs) |
| { |
| v9fs_string_free(lhs); |
| v9fs_string_sprintf(lhs, "%s", rhs->data); |
| } |
| |
| static size_t v9fs_string_size(V9fsString *str) |
| { |
| return str->size; |
| } |
| |
| static V9fsFidState *lookup_fid(V9fsState *s, int32_t fid) |
| { |
| V9fsFidState *f; |
| |
| for (f = s->fid_list; f; f = f->next) { |
| if (f->fid == fid) { |
| return f; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) |
| { |
| V9fsFidState *f; |
| |
| f = lookup_fid(s, fid); |
| if (f) { |
| return NULL; |
| } |
| |
| f = qemu_mallocz(sizeof(V9fsFidState)); |
| |
| f->fid = fid; |
| f->fd = -1; |
| f->dir = NULL; |
| |
| f->next = s->fid_list; |
| s->fid_list = f; |
| |
| return f; |
| } |
| |
| static int free_fid(V9fsState *s, int32_t fid) |
| { |
| V9fsFidState **fidpp, *fidp; |
| |
| for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) { |
| if ((*fidpp)->fid == fid) { |
| break; |
| } |
| } |
| |
| if (*fidpp == NULL) { |
| return -ENOENT; |
| } |
| |
| fidp = *fidpp; |
| *fidpp = fidp->next; |
| |
| if (fidp->fd != -1) { |
| v9fs_do_close(s, fidp->fd); |
| } |
| if (fidp->dir) { |
| v9fs_do_closedir(s, fidp->dir); |
| } |
| v9fs_string_free(&fidp->path); |
| qemu_free(fidp); |
| |
| return 0; |
| } |
| |
| #define P9_QID_TYPE_DIR 0x80 |
| #define P9_QID_TYPE_SYMLINK 0x02 |
| |
| #define P9_STAT_MODE_DIR 0x80000000 |
| #define P9_STAT_MODE_APPEND 0x40000000 |
| #define P9_STAT_MODE_EXCL 0x20000000 |
| #define P9_STAT_MODE_MOUNT 0x10000000 |
| #define P9_STAT_MODE_AUTH 0x08000000 |
| #define P9_STAT_MODE_TMP 0x04000000 |
| #define P9_STAT_MODE_SYMLINK 0x02000000 |
| #define P9_STAT_MODE_LINK 0x01000000 |
| #define P9_STAT_MODE_DEVICE 0x00800000 |
| #define P9_STAT_MODE_NAMED_PIPE 0x00200000 |
| #define P9_STAT_MODE_SOCKET 0x00100000 |
| #define P9_STAT_MODE_SETUID 0x00080000 |
| #define P9_STAT_MODE_SETGID 0x00040000 |
| #define P9_STAT_MODE_SETVTX 0x00010000 |
| |
| #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ |
| P9_STAT_MODE_SYMLINK | \ |
| P9_STAT_MODE_LINK | \ |
| P9_STAT_MODE_DEVICE | \ |
| P9_STAT_MODE_NAMED_PIPE | \ |
| P9_STAT_MODE_SOCKET) |
| |
| /* This is the algorithm from ufs in spfs */ |
| static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp) |
| { |
| size_t size; |
| |
| size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); |
| memcpy(&qidp->path, &stbuf->st_ino, size); |
| qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); |
| qidp->type = 0; |
| if (S_ISDIR(stbuf->st_mode)) { |
| qidp->type |= P9_QID_TYPE_DIR; |
| } |
| if (S_ISLNK(stbuf->st_mode)) { |
| qidp->type |= P9_QID_TYPE_SYMLINK; |
| } |
| } |
| |
| static int fid_to_qid(V9fsState *s, V9fsFidState *fidp, V9fsQID *qidp) |
| { |
| struct stat stbuf; |
| int err; |
| |
| err = v9fs_do_lstat(s, &fidp->path, &stbuf); |
| if (err) { |
| return err; |
| } |
| |
| stat_to_qid(&stbuf, qidp); |
| return 0; |
| } |
| |
| static V9fsPDU *alloc_pdu(V9fsState *s) |
| { |
| V9fsPDU *pdu = NULL; |
| |
| if (!QLIST_EMPTY(&s->free_list)) { |
| pdu = QLIST_FIRST(&s->free_list); |
| QLIST_REMOVE(pdu, next); |
| } |
| return pdu; |
| } |
| |
| static void free_pdu(V9fsState *s, V9fsPDU *pdu) |
| { |
| if (pdu) { |
| QLIST_INSERT_HEAD(&s->free_list, pdu, next); |
| } |
| } |
| |
| size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count, |
| size_t offset, size_t size, int pack) |
| { |
| int i = 0; |
| size_t copied = 0; |
| |
| for (i = 0; size && i < sg_count; i++) { |
| size_t len; |
| if (offset >= sg[i].iov_len) { |
| /* skip this sg */ |
| offset -= sg[i].iov_len; |
| continue; |
| } else { |
| len = MIN(sg[i].iov_len - offset, size); |
| if (pack) { |
| memcpy(sg[i].iov_base + offset, addr, len); |
| } else { |
| memcpy(addr, sg[i].iov_base + offset, len); |
| } |
| size -= len; |
| copied += len; |
| addr += len; |
| if (size) { |
| offset = 0; |
| continue; |
| } |
| } |
| } |
| |
| return copied; |
| } |
| |
| static size_t pdu_unpack(void *dst, V9fsPDU *pdu, size_t offset, size_t size) |
| { |
| return pdu_packunpack(dst, pdu->elem.out_sg, pdu->elem.out_num, |
| offset, size, 0); |
| } |
| |
| static size_t pdu_pack(V9fsPDU *pdu, size_t offset, const void *src, |
| size_t size) |
| { |
| return pdu_packunpack((void *)src, pdu->elem.in_sg, pdu->elem.in_num, |
| offset, size, 1); |
| } |
| |
| static int pdu_copy_sg(V9fsPDU *pdu, size_t offset, int rx, struct iovec *sg) |
| { |
| size_t pos = 0; |
| int i, j; |
| struct iovec *src_sg; |
| unsigned int num; |
| |
| if (rx) { |
| src_sg = pdu->elem.in_sg; |
| num = pdu->elem.in_num; |
| } else { |
| src_sg = pdu->elem.out_sg; |
| num = pdu->elem.out_num; |
| } |
| |
| j = 0; |
| for (i = 0; i < num; i++) { |
| if (offset <= pos) { |
| sg[j].iov_base = src_sg[i].iov_base; |
| sg[j].iov_len = src_sg[i].iov_len; |
| j++; |
| } else if (offset < (src_sg[i].iov_len + pos)) { |
| sg[j].iov_base = src_sg[i].iov_base; |
| sg[j].iov_len = src_sg[i].iov_len; |
| sg[j].iov_base += (offset - pos); |
| sg[j].iov_len -= (offset - pos); |
| j++; |
| } |
| pos += src_sg[i].iov_len; |
| } |
| |
| return j; |
| } |
| |
| static size_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
| { |
| size_t old_offset = offset; |
| va_list ap; |
| int i; |
| |
| va_start(ap, fmt); |
| for (i = 0; fmt[i]; i++) { |
| switch (fmt[i]) { |
| case 'b': { |
| uint8_t *valp = va_arg(ap, uint8_t *); |
| offset += pdu_unpack(valp, pdu, offset, sizeof(*valp)); |
| break; |
| } |
| case 'w': { |
| uint16_t val, *valp; |
| valp = va_arg(ap, uint16_t *); |
| val = le16_to_cpupu(valp); |
| offset += pdu_unpack(&val, pdu, offset, sizeof(val)); |
| *valp = val; |
| break; |
| } |
| case 'd': { |
| uint32_t val, *valp; |
| valp = va_arg(ap, uint32_t *); |
| val = le32_to_cpupu(valp); |
| offset += pdu_unpack(&val, pdu, offset, sizeof(val)); |
| *valp = val; |
| break; |
| } |
| case 'q': { |
| uint64_t val, *valp; |
| valp = va_arg(ap, uint64_t *); |
| val = le64_to_cpup(valp); |
| offset += pdu_unpack(&val, pdu, offset, sizeof(val)); |
| *valp = val; |
| break; |
| } |
| case 'v': { |
| struct iovec *iov = va_arg(ap, struct iovec *); |
| int *iovcnt = va_arg(ap, int *); |
| *iovcnt = pdu_copy_sg(pdu, offset, 0, iov); |
| break; |
| } |
| case 's': { |
| V9fsString *str = va_arg(ap, V9fsString *); |
| offset += pdu_unmarshal(pdu, offset, "w", &str->size); |
| /* FIXME: sanity check str->size */ |
| str->data = qemu_malloc(str->size + 1); |
| offset += pdu_unpack(str->data, pdu, offset, str->size); |
| str->data[str->size] = 0; |
| break; |
| } |
| case 'Q': { |
| V9fsQID *qidp = va_arg(ap, V9fsQID *); |
| offset += pdu_unmarshal(pdu, offset, "bdq", |
| &qidp->type, &qidp->version, &qidp->path); |
| break; |
| } |
| case 'S': { |
| V9fsStat *statp = va_arg(ap, V9fsStat *); |
| offset += pdu_unmarshal(pdu, offset, "wwdQdddqsssssddd", |
| &statp->size, &statp->type, &statp->dev, |
| &statp->qid, &statp->mode, &statp->atime, |
| &statp->mtime, &statp->length, |
| &statp->name, &statp->uid, &statp->gid, |
| &statp->muid, &statp->extension, |
| &statp->n_uid, &statp->n_gid, |
| &statp->n_muid); |
| break; |
| } |
| default: |
| break; |
| } |
| } |
| |
| va_end(ap); |
| |
| return offset - old_offset; |
| } |
| |
| static size_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
| { |
| size_t old_offset = offset; |
| va_list ap; |
| int i; |
| |
| va_start(ap, fmt); |
| for (i = 0; fmt[i]; i++) { |
| switch (fmt[i]) { |
| case 'b': { |
| uint8_t val = va_arg(ap, int); |
| offset += pdu_pack(pdu, offset, &val, sizeof(val)); |
| break; |
| } |
| case 'w': { |
| uint16_t val; |
| cpu_to_le16w(&val, va_arg(ap, int)); |
| offset += pdu_pack(pdu, offset, &val, sizeof(val)); |
| break; |
| } |
| case 'd': { |
| uint32_t val; |
| cpu_to_le32w(&val, va_arg(ap, uint32_t)); |
| offset += pdu_pack(pdu, offset, &val, sizeof(val)); |
| break; |
| } |
| case 'q': { |
| uint64_t val; |
| cpu_to_le64w(&val, va_arg(ap, uint64_t)); |
| offset += pdu_pack(pdu, offset, &val, sizeof(val)); |
| break; |
| } |
| case 'v': { |
| struct iovec *iov = va_arg(ap, struct iovec *); |
| int *iovcnt = va_arg(ap, int *); |
| *iovcnt = pdu_copy_sg(pdu, offset, 1, iov); |
| break; |
| } |
| case 's': { |
| V9fsString *str = va_arg(ap, V9fsString *); |
| offset += pdu_marshal(pdu, offset, "w", str->size); |
| offset += pdu_pack(pdu, offset, str->data, str->size); |
| break; |
| } |
| case 'Q': { |
| V9fsQID *qidp = va_arg(ap, V9fsQID *); |
| offset += pdu_marshal(pdu, offset, "bdq", |
| qidp->type, qidp->version, qidp->path); |
| break; |
| } |
| case 'S': { |
| V9fsStat *statp = va_arg(ap, V9fsStat *); |
| offset += pdu_marshal(pdu, offset, "wwdQdddqsssssddd", |
| statp->size, statp->type, statp->dev, |
| &statp->qid, statp->mode, statp->atime, |
| statp->mtime, statp->length, &statp->name, |
| &statp->uid, &statp->gid, &statp->muid, |
| &statp->extension, statp->n_uid, |
| statp->n_gid, statp->n_muid); |
| break; |
| } |
| default: |
| break; |
| } |
| } |
| va_end(ap); |
| |
| return offset - old_offset; |
| } |
| |
| static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len) |
| { |
| int8_t id = pdu->id + 1; /* Response */ |
| |
| if (len < 0) { |
| V9fsString str; |
| int err = -len; |
| |
| str.data = strerror(err); |
| str.size = strlen(str.data); |
| |
| len = 7; |
| len += pdu_marshal(pdu, len, "s", &str); |
| if (dotu) { |
| len += pdu_marshal(pdu, len, "d", err); |
| } |
| |
| id = P9_RERROR; |
| } |
| |
| /* fill out the header */ |
| pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag); |
| |
| /* keep these in sync */ |
| pdu->size = len; |
| pdu->id = id; |
| |
| /* push onto queue and notify */ |
| virtqueue_push(s->vq, &pdu->elem, len); |
| |
| /* FIXME: we should batch these completions */ |
| virtio_notify(&s->vdev, s->vq); |
| |
| free_pdu(s, pdu); |
| } |
| |
| static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) |
| { |
| mode_t ret; |
| |
| ret = mode & 0777; |
| if (mode & P9_STAT_MODE_DIR) { |
| ret |= S_IFDIR; |
| } |
| |
| if (dotu) { |
| if (mode & P9_STAT_MODE_SYMLINK) { |
| ret |= S_IFLNK; |
| } |
| if (mode & P9_STAT_MODE_SOCKET) { |
| ret |= S_IFSOCK; |
| } |
| if (mode & P9_STAT_MODE_NAMED_PIPE) { |
| ret |= S_IFIFO; |
| } |
| if (mode & P9_STAT_MODE_DEVICE) { |
| if (extension && extension->data[0] == 'c') { |
| ret |= S_IFCHR; |
| } else { |
| ret |= S_IFBLK; |
| } |
| } |
| } |
| |
| if (!(ret&~0777)) { |
| ret |= S_IFREG; |
| } |
| |
| if (mode & P9_STAT_MODE_SETUID) { |
| ret |= S_ISUID; |
| } |
| if (mode & P9_STAT_MODE_SETGID) { |
| ret |= S_ISGID; |
| } |
| if (mode & P9_STAT_MODE_SETVTX) { |
| ret |= S_ISVTX; |
| } |
| |
| return ret; |
| } |
| |
| static int donttouch_stat(V9fsStat *stat) |
| { |
| if (stat->type == -1 && |
| stat->dev == -1 && |
| stat->qid.type == -1 && |
| stat->qid.version == -1 && |
| stat->qid.path == -1 && |
| stat->mode == -1 && |
| stat->atime == -1 && |
| stat->mtime == -1 && |
| stat->length == -1 && |
| !stat->name.size && |
| !stat->uid.size && |
| !stat->gid.size && |
| !stat->muid.size && |
| stat->n_uid == -1 && |
| stat->n_gid == -1 && |
| stat->n_muid == -1) { |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static void v9fs_stat_free(V9fsStat *stat) |
| { |
| v9fs_string_free(&stat->name); |
| v9fs_string_free(&stat->uid); |
| v9fs_string_free(&stat->gid); |
| v9fs_string_free(&stat->muid); |
| v9fs_string_free(&stat->extension); |
| } |
| |
| static uint32_t stat_to_v9mode(const struct stat *stbuf) |
| { |
| uint32_t mode; |
| |
| mode = stbuf->st_mode & 0777; |
| if (S_ISDIR(stbuf->st_mode)) { |
| mode |= P9_STAT_MODE_DIR; |
| } |
| |
| if (dotu) { |
| if (S_ISLNK(stbuf->st_mode)) { |
| mode |= P9_STAT_MODE_SYMLINK; |
| } |
| |
| if (S_ISSOCK(stbuf->st_mode)) { |
| mode |= P9_STAT_MODE_SOCKET; |
| } |
| |
| if (S_ISFIFO(stbuf->st_mode)) { |
| mode |= P9_STAT_MODE_NAMED_PIPE; |
| } |
| |
| if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { |
| mode |= P9_STAT_MODE_DEVICE; |
| } |
| |
| if (stbuf->st_mode & S_ISUID) { |
| mode |= P9_STAT_MODE_SETUID; |
| } |
| |
| if (stbuf->st_mode & S_ISGID) { |
| mode |= P9_STAT_MODE_SETGID; |
| } |
| |
| if (stbuf->st_mode & S_ISVTX) { |
| mode |= P9_STAT_MODE_SETVTX; |
| } |
| } |
| |
| return mode; |
| } |
| |
| static int stat_to_v9stat(V9fsState *s, V9fsString *name, |
| const struct stat *stbuf, |
| V9fsStat *v9stat) |
| { |
| int err; |
| const char *str; |
| |
| memset(v9stat, 0, sizeof(*v9stat)); |
| |
| stat_to_qid(stbuf, &v9stat->qid); |
| v9stat->mode = stat_to_v9mode(stbuf); |
| v9stat->atime = stbuf->st_atime; |
| v9stat->mtime = stbuf->st_mtime; |
| v9stat->length = stbuf->st_size; |
| |
| v9fs_string_null(&v9stat->uid); |
| v9fs_string_null(&v9stat->gid); |
| v9fs_string_null(&v9stat->muid); |
| |
| if (dotu) { |
| v9stat->n_uid = stbuf->st_uid; |
| v9stat->n_gid = stbuf->st_gid; |
| v9stat->n_muid = 0; |
| |
| v9fs_string_null(&v9stat->extension); |
| |
| if (v9stat->mode & P9_STAT_MODE_SYMLINK) { |
| err = v9fs_do_readlink(s, name, &v9stat->extension); |
| if (err == -1) { |
| err = -errno; |
| return err; |
| } |
| v9stat->extension.data[err] = 0; |
| v9stat->extension.size = err; |
| } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { |
| v9fs_string_sprintf(&v9stat->extension, "%c %u %u", |
| S_ISCHR(stbuf->st_mode) ? 'c' : 'b', |
| major(stbuf->st_rdev), minor(stbuf->st_rdev)); |
| } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { |
| v9fs_string_sprintf(&v9stat->extension, "%s %u", |
| "HARDLINKCOUNT", stbuf->st_nlink); |
| } |
| } |
| |
| str = strrchr(name->data, '/'); |
| if (str) { |
| str += 1; |
| } else { |
| str = name->data; |
| } |
| |
| v9fs_string_sprintf(&v9stat->name, "%s", str); |
| |
| v9stat->size = 61 + |
| v9fs_string_size(&v9stat->name) + |
| v9fs_string_size(&v9stat->uid) + |
| v9fs_string_size(&v9stat->gid) + |
| v9fs_string_size(&v9stat->muid) + |
| v9fs_string_size(&v9stat->extension); |
| return 0; |
| } |
| |
| static struct iovec *adjust_sg(struct iovec *sg, int len, int *iovcnt) |
| { |
| while (len && *iovcnt) { |
| if (len < sg->iov_len) { |
| sg->iov_len -= len; |
| sg->iov_base += len; |
| len = 0; |
| } else { |
| len -= sg->iov_len; |
| sg++; |
| *iovcnt -= 1; |
| } |
| } |
| |
| return sg; |
| } |
| |
| static struct iovec *cap_sg(struct iovec *sg, int cap, int *cnt) |
| { |
| int i; |
| int total = 0; |
| |
| for (i = 0; i < *cnt; i++) { |
| if ((total + sg[i].iov_len) > cap) { |
| sg[i].iov_len -= ((total + sg[i].iov_len) - cap); |
| i++; |
| break; |
| } |
| total += sg[i].iov_len; |
| } |
| |
| *cnt = i; |
| |
| return sg; |
| } |
| |
| static void print_sg(struct iovec *sg, int cnt) |
| { |
| int i; |
| |
| printf("sg[%d]: {", cnt); |
| for (i = 0; i < cnt; i++) { |
| if (i) { |
| printf(", "); |
| } |
| printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); |
| } |
| printf("}\n"); |
| } |
| |
| static void v9fs_fix_path(V9fsString *dst, V9fsString *src, int len) |
| { |
| V9fsString str; |
| v9fs_string_init(&str); |
| v9fs_string_copy(&str, dst); |
| v9fs_string_sprintf(dst, "%s%s", src->data, str.data+len); |
| v9fs_string_free(&str); |
| } |
| |
| static void v9fs_version(V9fsState *s, V9fsPDU *pdu) |
| { |
| int32_t msize; |
| V9fsString version; |
| size_t offset = 7; |
| |
| pdu_unmarshal(pdu, offset, "ds", &msize, &version); |
| |
| if (strcmp(version.data, "9P2000.u")) { |
| v9fs_string_sprintf(&version, "unknown"); |
| } |
| |
| offset += pdu_marshal(pdu, offset, "ds", msize, &version); |
| complete_pdu(s, pdu, offset); |
| |
| v9fs_string_free(&version); |
| } |
| |
| static void v9fs_attach(V9fsState *s, V9fsPDU *pdu) |
| { |
| int32_t fid, afid, n_uname; |
| V9fsString uname, aname; |
| V9fsFidState *fidp; |
| V9fsQID qid; |
| size_t offset = 7; |
| ssize_t err; |
| |
| pdu_unmarshal(pdu, offset, "ddssd", &fid, &afid, &uname, &aname, &n_uname); |
| |
| fidp = alloc_fid(s, fid); |
| if (fidp == NULL) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| fidp->uid = n_uname; |
| |
| v9fs_string_sprintf(&fidp->path, "%s", "/"); |
| err = fid_to_qid(s, fidp, &qid); |
| if (err) { |
| err = -EINVAL; |
| free_fid(s, fid); |
| goto out; |
| } |
| |
| offset += pdu_marshal(pdu, offset, "Q", &qid); |
| |
| err = offset; |
| out: |
| complete_pdu(s, pdu, err); |
| v9fs_string_free(&uname); |
| v9fs_string_free(&aname); |
| } |
| |
| static void v9fs_stat_post_lstat(V9fsState *s, V9fsStatState *vs, int err) |
| { |
| if (err == -1) { |
| err = -errno; |
| goto out; |
| } |
| |
| err = stat_to_v9stat(s, &vs->fidp->path, &vs->stbuf, &vs->v9stat); |
| if (err) { |
| goto out; |
| } |
| vs->offset += pdu_marshal(vs->pdu, vs->offset, "wS", 0, &vs->v9stat); |
| err = vs->offset; |
| |
| out: |
| complete_pdu(s, vs->pdu, err); |
| v9fs_stat_free(&vs->v9stat); |
| qemu_free(vs); |
| } |
| |
| static void v9fs_stat(V9fsState *s, V9fsPDU *pdu) |
| { |
| int32_t fid; |
| V9fsStatState *vs; |
| ssize_t err = 0; |
| |
| vs = qemu_malloc(sizeof(*vs)); |
| vs->pdu = pdu; |
| vs->offset = 7; |
| |
| memset(&vs->v9stat, 0, sizeof(vs->v9stat)); |
| |
| pdu_unmarshal(vs->pdu, vs->offset, "d", &fid); |
| |
| vs->fidp = lookup_fid(s, fid); |
| if (vs->fidp == NULL) { |
| err = -ENOENT; |
| goto out; |
| } |
| |
| err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf); |
| v9fs_stat_post_lstat(s, vs, err); |
| return; |
| |
| out: |
| complete_pdu(s, vs->pdu, err); |
| v9fs_stat_free(&vs->v9stat); |
| qemu_free(vs); |
| } |
| |
| static void v9fs_walk_complete(V9fsState *s, V9fsWalkState *vs, int err) |
| { |
| complete_pdu(s, vs->pdu, err); |
| |
| if (vs->nwnames) { |
| for (vs->name_idx = 0; vs->name_idx < vs->nwnames; vs->name_idx++) { |
| v9fs_string_free(&vs->wnames[vs->name_idx]); |
| } |
| |
| qemu_free(vs->wnames); |
| qemu_free(vs->qids); |
| } |
| } |
| |
| static void v9fs_walk_marshal(V9fsWalkState *vs) |
| { |
| int i; |
| vs->offset = 7; |
| vs->offset += pdu_marshal(vs->pdu, vs->offset, "w", vs->nwnames); |
| |
| for (i = 0; i < vs->nwnames; i++) { |
| vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qids[i]); |
| } |
| } |
| |
| static void v9fs_walk_post_newfid_lstat(V9fsState *s, V9fsWalkState *vs, |
| int err) |
| { |
| if (err == -1) { |
| free_fid(s, vs->newfidp->fid); |
| v9fs_string_free(&vs->path); |
| err = -ENOENT; |
| goto out; |
| } |
| |
| stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]); |
| |
| vs->name_idx++; |
| if (vs->name_idx < vs->nwnames) { |
| v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data, |
| vs->wnames[vs->name_idx].data); |
| v9fs_string_copy(&vs->newfidp->path, &vs->path); |
| |
| err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf); |
| v9fs_walk_post_newfid_lstat(s, vs, err); |
| return; |
| } |
| |
| v9fs_string_free(&vs->path); |
| v9fs_walk_marshal(vs); |
| err = vs->offset; |
| out: |
| v9fs_walk_complete(s, vs, err); |
| } |
| |
| static void v9fs_walk_post_oldfid_lstat(V9fsState *s, V9fsWalkState *vs, |
| int err) |
| { |
| if (err == -1) { |
| v9fs_string_free(&vs->path); |
| err = -ENOENT; |
| goto out; |
| } |
| |
| stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]); |
| vs->name_idx++; |
| if (vs->name_idx < vs->nwnames) { |
| |
| v9fs_string_sprintf(&vs->path, "%s/%s", |
| vs->fidp->path.data, vs->wnames[vs->name_idx].data); |
| v9fs_string_copy(&vs->fidp->path, &vs->path); |
| |
| err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf); |
| v9fs_walk_post_oldfid_lstat(s, vs, err); |
| return; |
| } |
| |
| v9fs_string_free(&vs->path); |
| v9fs_walk_marshal(vs); |
| err = vs->offset; |
| out: |
| v9fs_walk_complete(s, vs, err); |
| } |
| |
| static void v9fs_walk(V9fsState *s, V9fsPDU *pdu) |
| { |
| int32_t fid, newfid; |
| V9fsWalkState *vs; |
| int err = 0; |
| int i; |
| |
| vs = qemu_malloc(sizeof(*vs)); |
| vs->pdu = pdu; |
| vs->wnames = NULL; |
| vs->qids = NULL; |
| vs->offset = 7; |
| |
| vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "ddw", &fid, |
| &newfid, &vs->nwnames); |
| |
| if (vs->nwnames) { |
| vs->wnames = qemu_mallocz(sizeof(vs->wnames[0]) * vs->nwnames); |
| |
| vs->qids = qemu_mallocz(sizeof(vs->qids[0]) * vs->nwnames); |
| |
| for (i = 0; i < vs->nwnames; i++) { |
| vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "s", |
| &vs->wnames[i]); |
| } |
| } |
| |
| vs->fidp = lookup_fid(s, fid); |
| if (vs->fidp == NULL) { |
| err = -ENOENT; |
| goto out; |
| } |
| |
| /* FIXME: is this really valid? */ |
| if (fid == newfid) { |
| |
| BUG_ON(vs->fidp->fd != -1); |
| BUG_ON(vs->fidp->dir); |
| v9fs_string_init(&vs->path); |
| vs->name_idx = 0; |
| |
| if (vs->name_idx < vs->nwnames) { |
| v9fs_string_sprintf(&vs->path, "%s/%s", |
| vs->fidp->path.data, vs->wnames[vs->name_idx].data); |
| v9fs_string_copy(&vs->fidp->path, &vs->path); |
| |
| err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf); |
| v9fs_walk_post_oldfid_lstat(s, vs, err); |
| return; |
| } |
| } else { |
| vs->newfidp = alloc_fid(s, newfid); |
| if (vs->newfidp == NULL) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| vs->newfidp->uid = vs->fidp->uid; |
| v9fs_string_init(&vs->path); |
| vs->name_idx = 0; |
| v9fs_string_copy(&vs->newfidp->path, &vs->fidp->path); |
| |
| if (vs->name_idx < vs->nwnames) { |
| v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data, |
| vs->wnames[vs->name_idx].data); |
| v9fs_string_copy(&vs->newfidp->path, &vs->path); |
| |
| err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf); |
| v9fs_walk_post_newfid_lstat(s, vs, err); |
| return; |
| } |
| } |
| |
| v9fs_walk_marshal(vs); |
| err = vs->offset; |
| out: |
| v9fs_walk_complete(s, vs, err); |
| } |
| |
| static void v9fs_open_post_opendir(V9fsState *s, V9fsOpenState *vs, int err) |
| { |
| if (vs->fidp->dir == NULL) { |
| err = -errno; |
| goto out; |
| } |
| |
| vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, 0); |
| err = vs->offset; |
| out: |
| complete_pdu(s, vs->pdu, err); |
| qemu_free(vs); |
| |
| } |
| |
| static void v9fs_open_post_open(V9fsState *s, V9fsOpenState *vs, int err) |
| { |
| if (vs->fidp->fd == -1) { |
| err = -errno; |
| goto out; |
| } |
| |
| vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, 0); |
| err = vs->offset; |
| out: |
| complete_pdu(s, vs->pdu, err); |
| qemu_free(vs); |
| } |
| |
| static void v9fs_open_post_lstat(V9fsState *s, V9fsOpenState *vs, int err) |
| { |
| if (err) { |
| err = -errno; |
| goto out; |
| } |
| |
| stat_to_qid(&vs->stbuf, &vs->qid); |
| |
| if (S_ISDIR(vs->stbuf.st_mode)) { |
| vs->fidp->dir = v9fs_do_opendir(s, &vs->fidp->path); |
| v9fs_open_post_opendir(s, vs, err); |
| } else { |
| vs->fidp->fd = v9fs_do_open(s, &vs->fidp->path, |
| omode_to_uflags(vs->mode)); |
| v9fs_open_post_open(s, vs, err); |
| } |
| return; |
| out: |
| complete_pdu(s, vs->pdu, err); |
| qemu_free(vs); |
| } |
| |
| static void v9fs_open(V9fsState *s, V9fsPDU *pdu) |
| { |
| int32_t fid; |
| V9fsOpenState *vs; |
| ssize_t err = 0; |
| |
| |
| vs = qemu_malloc(sizeof(*vs)); |
| vs->pdu = pdu; |
| vs->offset = 7; |
| |
| pdu_unmarshal(vs->pdu, vs->offset, "db", &fid, &vs->mode); |
| |
| vs->fidp = lookup_fid(s, fid); |
| if (vs->fidp == NULL) { |
| err = -ENOENT; |
| goto out; |
| } |
| |
| BUG_ON(vs->fidp->fd != -1); |
| BUG_ON(vs->fidp->dir); |
| |
| err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf); |
| |
| v9fs_open_post_lstat(s, vs, err); |
| return; |
| out: |
| complete_pdu(s, pdu, err); |
| qemu_free(vs); |
| } |
| |
| static void v9fs_clunk(V9fsState *s, V9fsPDU *pdu) |
| { |
| int32_t fid; |
| size_t offset = 7; |
| int err; |
| |
| pdu_unmarshal(pdu, offset, "d", &fid); |
| |
| err = free_fid(s, fid); |
| if (err < 0) { |
| goto out; |
| } |
| |
| offset = 7; |
| err = offset; |
| out: |
| complete_pdu(s, pdu, err); |
| } |
| |
| 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) |
| { |
| 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_post_writev(V9fsState *s, V9fsWriteState *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_writev(s, vs->fidp->fd, vs->sg, vs->cnt); |
| } while (vs->len == -1 && errno == EINTR); |
| if (vs->len == -1) { |
| err = -errno; |
| } |
| v9fs_write_post_writev(s, vs, err); |
| return; |
| } |
| vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->total); |
| |
| err = vs->offset; |
| out: |
| complete_pdu(s, vs->pdu, err); |
| qemu_free(vs); |
| } |
| |
| static void v9fs_write_post_lseek(V9fsState *s, V9fsWriteState *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_writev(s, vs->fidp->fd, vs->sg, vs->cnt); |
| } while (vs->len == -1 && errno == EINTR); |
| if (vs->len == -1) { |
| err = -errno; |
| } |
| v9fs_write_post_writev(s, vs, err); |
| return; |
| } |
| |
| out: |
| complete_pdu(s, vs->pdu, err); |
| qemu_free(vs); |
| } |
| |
| static void v9fs_write(V9fsState *s, V9fsPDU *pdu) |
| { |
| int32_t fid; |
| V9fsWriteState *vs; |
| ssize_t err; |
| |
| vs = qemu_malloc(sizeof(*vs)); |
| |
| vs->pdu = pdu; |
| vs->offset = 7; |
| vs->sg = vs->iov; |
| vs->total = 0; |
| vs->len = 0; |
| |
| pdu_unmarshal(vs->pdu, vs->offset, "dqdv", &fid, &vs->off, &vs->count, |
| vs->sg, &vs->cnt); |
| |
| vs->fidp = lookup_fid(s, fid); |
| if (vs->fidp == NULL) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| if (vs->fidp->fd == -1) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| err = v9fs_do_lseek(s, vs->fidp->fd, vs->off, SEEK_SET); |
| |
| v9fs_write_post_lseek(s, vs, err); |
| return; |
| |
| out: |
| complete_pdu(s, vs->pdu, err); |
| qemu_free(vs); |
| } |
| |
| 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) |
| { |
| 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) |
| { |
| /* A nop call with no return */ |
| complete_pdu(s, pdu, 7); |
| } |
| |
| static void v9fs_remove_post_remove(V9fsState *s, V9fsRemoveState *vs, |
| int err) |
| { |
| /* For TREMOVE we need to clunk the fid even on failed remove */ |
| err = free_fid(s, vs->fidp->fid); |
| if (err < 0) { |
| goto out; |
| } |
| |
| err = vs->offset; |
| out: |
| complete_pdu(s, vs->pdu, err); |
| qemu_free(vs); |
| } |
| |
| static void v9fs_remove(V9fsState *s, V9fsPDU *pdu) |
| { |
| int32_t fid; |
| V9fsRemoveState *vs; |
| int err = 0; |
| |
| vs = qemu_malloc(sizeof(*vs)); |
| vs->pdu = pdu; |
| vs->offset = 7; |
| |
| pdu_unmarshal(vs->pdu, vs->offset, "d", &fid); |
| |
| vs->fidp = lookup_fid(s, fid); |
| if (vs->fidp == NULL) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| err = v9fs_do_remove(s, &vs->fidp->path); |
| v9fs_remove_post_remove(s, vs, err); |
| return; |
| |
| out: |
| complete_pdu(s, pdu, err); |
| qemu_free(vs); |
| } |
| |
| static void v9fs_wstat_post_truncate(V9fsState *s, V9fsWstatState *vs, int err) |
| { |
| if (err < 0) { |
| goto out; |
| } |
| |
| err = vs->offset; |
| |
| out: |
| v9fs_stat_free(&vs->v9stat); |
| complete_pdu(s, vs->pdu, err); |
| qemu_free(vs); |
| } |
| |
| static void v9fs_wstat_post_rename(V9fsState *s, V9fsWstatState *vs, int err) |
| { |
| if (err < 0) { |
| goto out; |
| } |
| |
| if (vs->v9stat.name.size != 0) { |
| v9fs_string_free(&vs->nname); |
| } |
| |
| if (vs->v9stat.length != -1) { |
| if (v9fs_do_truncate(s, &vs->fidp->path, vs->v9stat.length) < 0) { |
| err = -errno; |
| } |
| } |
| v9fs_wstat_post_truncate(s, vs, err); |
| return; |
| |
| out: |
| v9fs_stat_free(&vs->v9stat); |
| complete_pdu(s, vs->pdu, err); |
| qemu_free(vs); |
| } |
| |
| static void v9fs_wstat_post_chown(V9fsState *s, V9fsWstatState *vs, int err) |
| { |
| V9fsFidState *fidp; |
| if (err < 0) { |
| goto out; |
| } |
| |
| if (vs->v9stat.name.size != 0) { |
| char *old_name, *new_name; |
| char *end; |
| |
| old_name = vs->fidp->path.data; |
| end = strrchr(old_name, '/'); |
| if (end) { |
| end++; |
| } else { |
| end = old_name; |
| } |
| |
| new_name = qemu_malloc(end - old_name + vs->v9stat.name.size + 1); |
| |
| memset(new_name, 0, end - old_name + vs->v9stat.name.size + 1); |
| memcpy(new_name, old_name, end - old_name); |
| memcpy(new_name + (end - old_name), vs->v9stat.name.data, |
| vs->v9stat.name.size); |
| vs->nname.data = new_name; |
| vs->nname.size = strlen(new_name); |
| |
| if (strcmp(new_name, vs->fidp->path.data) != 0) { |
| if (v9fs_do_rename(s, &vs->fidp->path, &vs->nname)) { |
| err = -errno; |
| } else { |
| /* |
| * Fixup fid's pointing to the old name to |
| * start pointing to the new name |
| */ |
| for (fidp = s->fid_list; fidp; fidp = fidp->next) { |
| |
| if (vs->fidp == fidp) { |
| /* |
| * we replace name of this fid towards the end |
| * so that our below strcmp will work |
| */ |
| continue; |
| } |
| if (!strncmp(vs->fidp->path.data, fidp->path.data, |
| strlen(vs->fidp->path.data))) { |
| /* replace the name */ |
| v9fs_fix_path(&fidp->path, &vs->nname, |
| strlen(vs->fidp->path.data)); |
| } |
| } |
| v9fs_string_copy(&vs->fidp->path, &vs->nname); |
| } |
| } |
| } |
| v9fs_wstat_post_rename(s, vs, err); |
| return; |
| |
| out: |
| v9fs_stat_free(&vs->v9stat); |
| complete_pdu(s, vs->pdu, err); |
| qemu_free(vs); |
| } |
| |
| static void v9fs_wstat_post_utime(V9fsState *s, V9fsWstatState *vs, int err) |
| { |
| if (err < 0) { |
| goto out; |
| } |
| |
| if (vs->v9stat.n_gid != -1) { |
| if (v9fs_do_chown(s, &vs->fidp->path, vs->v9stat.n_uid, |
| vs->v9stat.n_gid)) { |
| err = -errno; |
| } |
| } |
| v9fs_wstat_post_chown(s, vs, err); |
| return; |
| |
| out: |
| v9fs_stat_free(&vs->v9stat); |
| complete_pdu(s, vs->pdu, err); |
| qemu_free(vs); |
| } |
| |
| static void v9fs_wstat_post_chmod(V9fsState *s, V9fsWstatState *vs, int err) |
| { |
| if (err < 0) { |
| goto out; |
| } |
| |
| if (vs->v9stat.mtime != -1) { |
| struct utimbuf tb; |
| tb.actime = 0; |
| tb.modtime = vs->v9stat.mtime; |
| if (v9fs_do_utime(s, &vs->fidp->path, &tb)) { |
| err = -errno; |
| } |
| } |
| |
| v9fs_wstat_post_utime(s, vs, err); |
| return; |
| |
| out: |
| v9fs_stat_free(&vs->v9stat); |
| complete_pdu(s, vs->pdu, err); |
| qemu_free(vs); |
| } |
| |
| static void v9fs_wstat_post_fsync(V9fsState *s, V9fsWstatState *vs, int err) |
| { |
| if (err == -1) { |
| err = -errno; |
| } |
| v9fs_stat_free(&vs->v9stat); |
| complete_pdu(s, vs->pdu, err); |
| qemu_free(vs); |
| } |
| |
| static void v9fs_wstat_post_lstat(V9fsState *s, V9fsWstatState *vs, int err) |
| { |
| uint32_t v9_mode; |
| |
| if (err == -1) { |
| err = -errno; |
| goto out; |
| } |
| |
| v9_mode = stat_to_v9mode(&vs->stbuf); |
| |
| if ((vs->v9stat.mode & P9_STAT_MODE_TYPE_BITS) != |
| (v9_mode & P9_STAT_MODE_TYPE_BITS)) { |
| /* Attempting to change the type */ |
| err = -EIO; |
| goto out; |
| } |
| |
| if (v9fs_do_chmod(s, &vs->fidp->path, v9mode_to_mode(vs->v9stat.mode, |
| &vs->v9stat.extension))) { |
| err = -errno; |
| } |
| v9fs_wstat_post_chmod(s, vs, err); |
| return; |
| |
| out: |
| v9fs_stat_free(&vs->v9stat); |
| complete_pdu(s, vs->pdu, err); |
| qemu_free(vs); |
| } |
| |
| static void v9fs_wstat(V9fsState *s, V9fsPDU *pdu) |
| { |
| int32_t fid; |
| V9fsWstatState *vs; |
| int err = 0; |
| |
| vs = qemu_malloc(sizeof(*vs)); |
| vs->pdu = pdu; |
| vs->offset = 7; |
| |
| pdu_unmarshal(pdu, vs->offset, "dwS", &fid, &vs->unused, &vs->v9stat); |
| |
| vs->fidp = lookup_fid(s, fid); |
| if (vs->fidp == NULL) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| /* do we need to sync the file? */ |
| if (donttouch_stat(&vs->v9stat)) { |
| err = v9fs_do_fsync(s, vs->fidp->fd); |
| v9fs_wstat_post_fsync(s, vs, err); |
| return; |
| } |
| |
| if (vs->v9stat.mode != -1) { |
| err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf); |
| v9fs_wstat_post_lstat(s, vs, err); |
| return; |
| } |
| |
| v9fs_wstat_post_chmod(s, vs, err); |
| return; |
| |
| out: |
| v9fs_stat_free(&vs->v9stat); |
| complete_pdu(s, vs->pdu, err); |
| qemu_free(vs); |
| } |
| |
| typedef void (pdu_handler_t)(V9fsState *s, V9fsPDU *pdu); |
| |
| static pdu_handler_t *pdu_handlers[] = { |
| [P9_TVERSION] = v9fs_version, |
| [P9_TATTACH] = v9fs_attach, |
| [P9_TSTAT] = v9fs_stat, |
| [P9_TWALK] = v9fs_walk, |
| [P9_TCLUNK] = v9fs_clunk, |
| [P9_TOPEN] = v9fs_open, |
| [P9_TREAD] = v9fs_read, |
| #if 0 |
| [P9_TAUTH] = v9fs_auth, |
| #endif |
| [P9_TFLUSH] = v9fs_flush, |
| [P9_TCREATE] = v9fs_create, |
| [P9_TWRITE] = v9fs_write, |
| [P9_TWSTAT] = v9fs_wstat, |
| [P9_TREMOVE] = v9fs_remove, |
| }; |
| |
| static void submit_pdu(V9fsState *s, V9fsPDU *pdu) |
| { |
| pdu_handler_t *handler; |
| |
| if (debug_9p_pdu) { |
| pprint_pdu(pdu); |
| } |
| |
| BUG_ON(pdu->id >= ARRAY_SIZE(pdu_handlers)); |
| |
| handler = pdu_handlers[pdu->id]; |
| BUG_ON(handler == NULL); |
| |
| handler(s, pdu); |
| } |
| |
| static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq) |
| { |
| V9fsState *s = (V9fsState *)vdev; |
| V9fsPDU *pdu; |
| ssize_t len; |
| |
| while ((pdu = alloc_pdu(s)) && |
| (len = virtqueue_pop(vq, &pdu->elem)) != 0) { |
| uint8_t *ptr; |
| |
| BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0); |
| BUG_ON(pdu->elem.out_sg[0].iov_len < 7); |
| |
| ptr = pdu->elem.out_sg[0].iov_base; |
| |
| memcpy(&pdu->size, ptr, 4); |
| pdu->id = ptr[4]; |
| memcpy(&pdu->tag, ptr + 5, 2); |
| |
| submit_pdu(s, pdu); |
| } |
| |
| free_pdu(s, pdu); |
| } |
| |
| static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features) |
| { |
| features |= 1 << VIRTIO_9P_MOUNT_TAG; |
| return features; |
| } |
| |
| static V9fsState *to_virtio_9p(VirtIODevice *vdev) |
| { |
| return (V9fsState *)vdev; |
| } |
| |
| static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config) |
| { |
| struct virtio_9p_config *cfg; |
| V9fsState *s = to_virtio_9p(vdev); |
| |
| cfg = qemu_mallocz(sizeof(struct virtio_9p_config) + |
| s->tag_len); |
| stw_raw(&cfg->tag_len, s->tag_len); |
| memcpy(cfg->tag, s->tag, s->tag_len); |
| memcpy(config, cfg, s->config_size); |
| qemu_free(cfg); |
| } |
| |
| VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf) |
| { |
| V9fsState *s; |
| int i, len; |
| struct stat stat; |
| FsTypeEntry *fse; |
| |
| |
| s = (V9fsState *)virtio_common_init("virtio-9p", |
| VIRTIO_ID_9P, |
| sizeof(struct virtio_9p_config)+ |
| MAX_TAG_LEN, |
| sizeof(V9fsState)); |
| |
| /* initialize pdu allocator */ |
| QLIST_INIT(&s->free_list); |
| for (i = 0; i < (MAX_REQ - 1); i++) { |
| QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); |
| } |
| |
| s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output); |
| |
| fse = get_fsdev_fsentry(conf->fsdev_id); |
| |
| if (!fse) { |
| /* We don't have a fsdev identified by fsdev_id */ |
| fprintf(stderr, "Virtio-9p device couldn't find fsdev " |
| "with the id %s\n", conf->fsdev_id); |
| exit(1); |
| } |
| |
| if (!fse->path || !conf->tag) { |
| /* we haven't specified a mount_tag or the path */ |
| fprintf(stderr, "fsdev with id %s needs path " |
| "and Virtio-9p device needs mount_tag arguments\n", |
| conf->fsdev_id); |
| exit(1); |
| } |
| |
| if (!strcmp(fse->security_model, "passthrough")) { |
| /* Files on the Fileserver set to client user credentials */ |
| s->ctx.fs_sm = SM_PASSTHROUGH; |
| } else if (!strcmp(fse->security_model, "mapped")) { |
| /* Files on the fileserver are set to QEMU credentials. |
| * Client user credentials are saved in extended attributes. |
| */ |
| s->ctx.fs_sm = SM_MAPPED; |
| } else { |
| /* user haven't specified a correct security option */ |
| fprintf(stderr, "one of the following must be specified as the" |
| "security option:\n\t security_model=passthrough \n\t " |
| "security_model=mapped\n"); |
| return NULL; |
| } |
| |
| if (lstat(fse->path, &stat)) { |
| fprintf(stderr, "share path %s does not exist\n", fse->path); |
| exit(1); |
| } else if (!S_ISDIR(stat.st_mode)) { |
| fprintf(stderr, "share path %s is not a directory \n", fse->path); |
| exit(1); |
| } |
| |
| s->ctx.fs_root = qemu_strdup(fse->path); |
| len = strlen(conf->tag); |
| if (len > MAX_TAG_LEN) { |
| len = MAX_TAG_LEN; |
| } |
| /* s->tag is non-NULL terminated string */ |
| s->tag = qemu_malloc(len); |
| memcpy(s->tag, conf->tag, len); |
| s->tag_len = len; |
| s->ctx.uid = -1; |
| |
| s->ops = fse->ops; |
| s->vdev.get_features = virtio_9p_get_features; |
| s->config_size = sizeof(struct virtio_9p_config) + |
| s->tag_len; |
| s->vdev.get_config = virtio_9p_get_config; |
| |
| return &s->vdev; |
| } |