Implement statfs support in qemu 9p server. statfs gets file system statistics such as type of file system, optimal transfer block size etc.
statfs - get file system statistics size[4] Tstatfs tag[2] fid[4] size[4] Rstatfs tag[2] type[4] bsize[4] blocks[8] bfree[8] bavail[8] files[8] ffree[8] fsid[8] namelen[4] Signed-off-by: Sripathi Kodi <sripat...@in.ibm.com> Signed-off-by: M. Mohan Kumar <mo...@in.ibm.com> --- hw/file-op-9p.h | 2 + hw/virtio-9p-local.c | 6 ++++ hw/virtio-9p.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++ hw/virtio-9p.h | 24 +++++++++++++++++++ 4 files changed, 95 insertions(+), 0 deletions(-) diff --git a/hw/file-op-9p.h b/hw/file-op-9p.h index f84767f..2934ff1 100644 --- a/hw/file-op-9p.h +++ b/hw/file-op-9p.h @@ -18,6 +18,7 @@ #include <utime.h> #include <sys/stat.h> #include <sys/uio.h> +#include <sys/vfs.h> typedef struct FsContext { @@ -55,6 +56,7 @@ typedef struct FileOperations int (*rename)(FsContext *, const char *, const char *); int (*truncate)(FsContext *, const char *, off_t); int (*fsync)(FsContext *, int); + int (*statfs)(FsContext *s, const char *path, struct statfs *stbuf); void *opaque; } FileOperations; #endif diff --git a/hw/virtio-9p-local.c b/hw/virtio-9p-local.c index 1afb731..78960ac 100644 --- a/hw/virtio-9p-local.c +++ b/hw/virtio-9p-local.c @@ -262,6 +262,11 @@ static int local_fsync(FsContext *ctx, int fd) return fsync(fd); } +static int local_statfs(FsContext *s, const char *path, struct statfs *stbuf) +{ + return statfs(rpath(s, path), stbuf); +} + FileOperations local_ops = { .lstat = local_lstat, .setuid = local_setuid, @@ -291,4 +296,5 @@ FileOperations local_ops = { .utime = local_utime, .remove = local_remove, .fsync = local_fsync, + .statfs = local_statfs, }; diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c index 25bd723..bba6144 100644 --- a/hw/virtio-9p.c +++ b/hw/virtio-9p.c @@ -2226,9 +2226,72 @@ out: qemu_free(vs); } +static int v9fs_do_statfs(V9fsState *s, V9fsString *path, struct statfs *stbuf) +{ + return s->ops->statfs(&s->ctx, path->data, stbuf); +} + +static void v9fs_statfs_post_statfs(V9fsState *s, V9fsStatfsState *vs, int err) +{ + if (err) { + err = -errno; + goto out; + } + + vs->v9statfs.f_type = vs->stbuf.f_type; + vs->v9statfs.f_bsize = vs->stbuf.f_bsize; + vs->v9statfs.f_blocks = vs->stbuf.f_blocks; + vs->v9statfs.f_bfree = vs->stbuf.f_bfree; + vs->v9statfs.f_bavail = vs->stbuf.f_bavail; + vs->v9statfs.f_files = vs->stbuf.f_files; + vs->v9statfs.f_ffree = vs->stbuf.f_ffree; + vs->v9statfs.fsid_val = (unsigned int) vs->stbuf.f_fsid.__val[0] | + (unsigned long long)vs->stbuf.f_fsid.__val[1] << 32; + vs->v9statfs.f_namelen = vs->stbuf.f_namelen; + + vs->offset += pdu_marshal(vs->pdu, vs->offset, "ddqqqqqqd", + vs->v9statfs.f_type, vs->v9statfs.f_bsize, vs->v9statfs.f_blocks, + vs->v9statfs.f_bfree, vs->v9statfs.f_bavail, vs->v9statfs.f_files, + vs->v9statfs.f_ffree, vs->v9statfs.fsid_val, + vs->v9statfs.f_namelen); + +out: + complete_pdu(s, vs->pdu, vs->offset); + qemu_free(vs); +} + +static void v9fs_statfs(V9fsState *s, V9fsPDU *pdu) +{ + V9fsStatfsState *vs; + ssize_t err = 0; + + vs = qemu_malloc(sizeof(*vs)); + vs->pdu = pdu; + vs->offset = 7; + + memset(&vs->v9statfs, 0, sizeof(vs->v9statfs)); + + pdu_unmarshal(vs->pdu, vs->offset, "d", &vs->fid); + + vs->fidp = lookup_fid(s, vs->fid); + if (vs->fidp == NULL) { + err = -ENOENT; + goto out; + } + + err = v9fs_do_statfs(s, &vs->fidp->path, &vs->stbuf); + v9fs_statfs_post_statfs(s, vs, err); + return; + +out: + 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_TSTATFS] = v9fs_statfs, [P9_TVERSION] = v9fs_version, [P9_TATTACH] = v9fs_attach, [P9_TSTAT] = v9fs_stat, diff --git a/hw/virtio-9p.h b/hw/virtio-9p.h index 3a1e853..9b6cbde 100644 --- a/hw/virtio-9p.h +++ b/hw/virtio-9p.h @@ -13,6 +13,8 @@ #define VIRTIO_9P_MOUNT_TAG 0 enum { + P9_TSTATFS = 8, + P9_RSTATFS, P9_TVERSION = 100, P9_RVERSION, P9_TAUTH = 102, @@ -160,6 +162,28 @@ struct virtio_9p_config uint8_t tag[0]; } __attribute__((packed)); +typedef struct V9fsStatfs +{ + uint32_t f_type; + uint32_t f_bsize; + uint64_t f_blocks; + uint64_t f_bfree; + uint64_t f_bavail; + uint64_t f_files; + uint64_t f_ffree; + uint64_t fsid_val; + uint32_t f_namelen; +} V9fsStatfs; + +typedef struct V9fsStatfsState { + V9fsPDU *pdu; + size_t offset; + int32_t fid; + V9fsStatfs v9statfs; + V9fsFidState *fidp; + struct statfs stbuf; +} V9fsStatfsState; + extern size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count, size_t offset, size_t size, int pack); -- 1.6.6.1