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[Qemu-devel] Re: [V9fs-developer] [PATCH] [virtio-9p] Server side implem
From: |
Aneesh Kumar K. V |
Subject: |
[Qemu-devel] Re: [V9fs-developer] [PATCH] [virtio-9p] Server side implementation for TLINK |
Date: |
Wed, 02 Jun 2010 19:04:00 +0530 |
User-agent: |
Notmuch/ (http://notmuchmail.org) Emacs/24.0.50.1 (i686-pc-linux-gnu) |
On Sun, 30 May 2010 09:40:38 -0700, "Venkateswararao Jujjuri (JV)"
<address@hidden> wrote:
> Create a link.
>
> SYNOPSIS
>
> size[4] Tlink tag[2] dfid[4] oldpath[s] newpath[s]
>
> size[4] Rlink tag[2]
>
> DESCRIPTION
>
> Create a link 'newpath' in directory pointed by dfid linking to oldpath.
>
> Signed-off-by: Venkateswararao Jujjuri <address@hidden>
> ---
> hw/file-op-9p.h | 2 +-
> hw/virtio-9p-debug.c | 9 +++++++++
> hw/virtio-9p-local.c | 2 +-
> hw/virtio-9p.c | 40 ++++++++++++++++++++++++++++++++--------
> hw/virtio-9p.h | 2 ++
> 5 files changed, 45 insertions(+), 10 deletions(-)
>
> diff --git a/hw/file-op-9p.h b/hw/file-op-9p.h
> index b3a320c..6744d69 100644
> --- a/hw/file-op-9p.h
> +++ b/hw/file-op-9p.h
> @@ -55,7 +55,7 @@ typedef struct FileOperations
> int (*utime)(FsContext *, const char *, const struct utimbuf *);
> int (*remove)(FsContext *, const char *);
> int (*symlink)(FsContext *, const char *, const char *, FsCred *);
> - int (*link)(FsContext *, const char *, const char *, FsCred *);
> + int (*link)(FsContext *, const char *, const char *);
> int (*setuid)(FsContext *, uid_t);
> int (*close)(FsContext *, int);
> int (*closedir)(FsContext *, DIR *);
> diff --git a/hw/virtio-9p-debug.c b/hw/virtio-9p-debug.c
> index a82b771..a870b97 100644
> --- a/hw/virtio-9p-debug.c
> +++ b/hw/virtio-9p-debug.c
> @@ -463,6 +463,15 @@ void pprint_pdu(V9fsPDU *pdu)
> case P9_RCLUNK:
> fprintf(llogfile, "RCLUNK: (");
> break;
> + case P9_TLINK:
> + fprintf(llogfile, "TLINK: (");
> + pprint_int32(pdu, 0, &offset, "fid");
> + pprint_str(pdu, 0, &offset, ", name");
> + pprint_str(pdu, 0, &offset, ", linkname");
> + break;
> + case P9_RLINK:
> + fprintf(llogfile, "RLINK: (");
> + break;
> case P9_TREMOVE:
> fprintf(llogfile, "TREMOVE: (");
> pprint_int32(pdu, 0, &offset, "fid");
> diff --git a/hw/virtio-9p-local.c b/hw/virtio-9p-local.c
> index c5678ae..fa8d05c 100644
> --- a/hw/virtio-9p-local.c
> +++ b/hw/virtio-9p-local.c
> @@ -375,7 +375,7 @@ err_end:
> }
>
> static int local_link(FsContext *fs_ctx, const char *oldpath,
> - const char *newpath, FsCred *credp)
> + const char *newpath)
> {
> char *tmp = qemu_strdup(rpath(fs_ctx, oldpath));
> int err;
I guess it would be good to make sure local_link use linkat with
flags = 0 to ensure that we won't follow symlinks. But that can be
seperate patch.
> diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c
> index 097dce8..d36d206 100644
> --- a/hw/virtio-9p.c
> +++ b/hw/virtio-9p.c
> @@ -212,14 +212,9 @@ static int v9fs_do_symlink(V9fsState *s, V9fsCreateState
> *vs)
> &cred);
> }
>
> -static int v9fs_do_link(V9fsState *s, V9fsFidState *nfidp, V9fsCreateState
> *vs)
> +static int v9fs_do_link(V9fsState *s, char *oldpath, char *fullname)
> {
> - FsCred cred;
> - cred_init(&cred);
> - cred.fc_uid = nfidp->uid;
> - cred.fc_mode = vs->perm & 0777;
> -
> - return s->ops->link(&s->ctx, nfidp->path.data, vs->fullname.data, &cred);
> + return s->ops->link(&s->ctx, oldpath, fullname);
> }
>
> static int v9fs_do_truncate(V9fsState *s, V9fsString *path, off_t size)
> @@ -1919,7 +1914,7 @@ static void v9fs_create_post_lstat(V9fsState *s,
> V9fsCreateState *vs, int err)
> err = -errno;
> v9fs_post_create(s, vs, err);
> }
> - err = v9fs_do_link(s, nfidp, vs);
> + err = v9fs_do_link(s, nfidp->path.data, vs->fullname.data);
> v9fs_create_post_perms(s, vs, err);
> } else if (vs->perm & P9_STAT_MODE_DEVICE) {
> char ctype;
> @@ -1999,6 +1994,34 @@ out:
> qemu_free(vs);
> }
>
> +static void v9fs_link(V9fsState *s, V9fsPDU *pdu)
> +{
> + int32_t dfid;
> + V9fsFidState *dfidp;
> + V9fsString name, fullname, oldname;
> + size_t offset = 7;
> + int err = 0;
> +
> + v9fs_string_init(&fullname);
> +
> + pdu_unmarshal(pdu, offset, "dss", &dfid, &oldname, &name);
> +
> + dfidp = lookup_fid(s, dfid);
> + if (dfidp == NULL) {
> + err = -errno;
> + goto out;
> + }
> +
> + v9fs_string_sprintf(&fullname, "%s/%s", dfidp->path.data, name.data);
> + err = v9fs_do_link(s, oldname.data, fullname.data);
> + v9fs_string_free(&fullname);
> +
> +out:
> + v9fs_string_free(&name);
> + v9fs_string_free(&oldname);
> + complete_pdu(s, pdu, err);
> +}
> +
> static void v9fs_flush(V9fsState *s, V9fsPDU *pdu)
> {
> /* A nop call with no return */
> @@ -2354,6 +2377,7 @@ static pdu_handler_t *pdu_handlers[] = {
> [P9_TAUTH] = v9fs_auth,
> #endif
> [P9_TFLUSH] = v9fs_flush,
> + [P9_TLINK] = v9fs_link,
> [P9_TCREATE] = v9fs_create,
> [P9_TWRITE] = v9fs_write,
> [P9_TWSTAT] = v9fs_wstat,
> diff --git a/hw/virtio-9p.h b/hw/virtio-9p.h
> index 9773659..6b3d4a4 100644
> --- a/hw/virtio-9p.h
> +++ b/hw/virtio-9p.h
> @@ -17,6 +17,8 @@ enum {
> P9_RSTATFS,
> P9_TREADDIR = 40,
> P9_RREADDIR,
> + P9_TLINK = 70,
> + P9_RLINK,
> P9_TVERSION = 100,
> P9_RVERSION,
> P9_TAUTH = 102,
> --
> 1.6.5.2
-aneesh
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