From: "Dr. David Alan Gilbert" <dgilb...@redhat.com> Fill in definitions for map, unmap and sync commands.
Signed-off-by: Dr. David Alan Gilbert <dgilb...@redhat.com> --- hw/virtio/vhost-user-fs.c | 129 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 123 insertions(+), 6 deletions(-) diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c index da70d9cd2c..bbb15477e5 100644 --- a/hw/virtio/vhost-user-fs.c +++ b/hw/virtio/vhost-user-fs.c @@ -24,20 +24,137 @@ int vhost_user_fs_slave_map(struct vhost_dev *dev, VhostUserFSSlaveMsg *sm, int fd) { - /* TODO */ - return -1; + VHostUserFS *fs = VHOST_USER_FS(dev->vdev); + size_t cache_size = fs->conf.cache_size; + void *cache_host = memory_region_get_ram_ptr(&fs->cache); + + unsigned int i; + int res = 0; + + if (fd < 0) { + fprintf(stderr, "%s: Bad fd for map\n", __func__); + return -1; + } + + for (i = 0; i < VHOST_USER_FS_SLAVE_ENTRIES; i++) { + if (sm->len[i] == 0) { + continue; + } + + if ((sm->c_offset[i] + sm->len[i]) < sm->len[i] || + (sm->c_offset[i] + sm->len[i]) > cache_size) { + fprintf(stderr, "%s: Bad offset/len for map [%d] %" + PRIx64 "+%" PRIx64 "\n", __func__, + i, sm->c_offset[i], sm->len[i]); + res = -1; + break; + } + + if (mmap(cache_host + sm->c_offset[i], sm->len[i], + ((sm->flags[i] & VHOST_USER_FS_FLAG_MAP_R) ? PROT_READ : 0) | + ((sm->flags[i] & VHOST_USER_FS_FLAG_MAP_W) ? PROT_WRITE : 0), + MAP_SHARED | MAP_FIXED, + fd, sm->fd_offset[i]) != (cache_host + sm->c_offset[i])) { + fprintf(stderr, "%s: map failed err %d [%d] %" + PRIx64 "+%" PRIx64 " from %" PRIx64 "\n", __func__, + errno, i, sm->c_offset[i], sm->len[i], + sm->fd_offset[i]); + res = -1; + break; + } + } + + if (res) { + /* Something went wrong, unmap them all */ + vhost_user_fs_slave_unmap(dev, sm); + } + return res; } int vhost_user_fs_slave_unmap(struct vhost_dev *dev, VhostUserFSSlaveMsg *sm) { - /* TODO */ - return -1; + VHostUserFS *fs = VHOST_USER_FS(dev->vdev); + size_t cache_size = fs->conf.cache_size; + void *cache_host = memory_region_get_ram_ptr(&fs->cache); + + unsigned int i; + int res = 0; + + /* Note even if one unmap fails we try the rest, since the effect + * is to clean up as much as possible. + */ + for (i = 0; i < VHOST_USER_FS_SLAVE_ENTRIES; i++) { + void *ptr; + if (sm->len[i] == 0) { + continue; + } + + if (sm->len[i] == ~(uint64_t)0) { + /* Special case meaning the whole arena */ + sm->len[i] = cache_size; + } + + if ((sm->c_offset[i] + sm->len[i]) < sm->len[i] || + (sm->c_offset[i] + sm->len[i]) > cache_size) { + fprintf(stderr, "%s: Bad offset/len for unmap [%d] %" + PRIx64 "+%" PRIx64 "\n", __func__, + i, sm->c_offset[i], sm->len[i]); + res = -1; + continue; + } + + ptr = mmap(cache_host + sm->c_offset[i], sm->len[i], + PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0); + if (ptr != (cache_host + sm->c_offset[i])) { + fprintf(stderr, "%s: mmap failed (%s) [%d] %" + PRIx64 "+%" PRIx64 " from %" PRIx64 " res: %p\n", + __func__, + strerror(errno), + i, sm->c_offset[i], sm->len[i], + sm->fd_offset[i], ptr); + res = -1; + } + } + + return res; } int vhost_user_fs_slave_sync(struct vhost_dev *dev, VhostUserFSSlaveMsg *sm) { - /* TODO */ - return -1; + VHostUserFS *fs = VHOST_USER_FS(dev->vdev); + size_t cache_size = fs->conf.cache_size; + void *cache_host = memory_region_get_ram_ptr(&fs->cache); + + unsigned int i; + int res = 0; + + /* Note even if one sync fails we try the rest */ + for (i = 0; i < VHOST_USER_FS_SLAVE_ENTRIES; i++) { + if (sm->len[i] == 0) { + continue; + } + + if ((sm->c_offset[i] + sm->len[i]) < sm->len[i] || + (sm->c_offset[i] + sm->len[i]) > cache_size) { + fprintf(stderr, "%s: Bad offset/len for sync [%d] %" + PRIx64 "+%" PRIx64 "\n", __func__, + i, sm->c_offset[i], sm->len[i]); + res = -1; + continue; + } + + if (msync(cache_host + sm->c_offset[i], sm->len[i], + MS_SYNC /* ?? */)) { + fprintf(stderr, "%s: msync failed (%s) [%d] %" + PRIx64 "+%" PRIx64 " from %" PRIx64 "\n", __func__, + strerror(errno), + i, sm->c_offset[i], sm->len[i], + sm->fd_offset[i]); + res = -1; + } + } + + return res; } -- 2.19.2