From patchwork Wed Jul 21 16:04:53 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: jvrao X-Patchwork-Id: 59460 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [199.232.76.165]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id E6B56B70BF for ; Thu, 22 Jul 2010 02:24:12 +1000 (EST) Received: from localhost ([127.0.0.1]:33112 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Obc5Z-0000vI-Ea for incoming@patchwork.ozlabs.org; Wed, 21 Jul 2010 12:24:09 -0400 Received: from [140.186.70.92] (port=52830 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Obbkh-00023s-VH for qemu-devel@nongnu.org; Wed, 21 Jul 2010 12:02:48 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1Obbka-0000Dj-IS for qemu-devel@nongnu.org; Wed, 21 Jul 2010 12:02:35 -0400 Received: from e4.ny.us.ibm.com ([32.97.182.144]:47777) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1Obbka-0000DY-7e for qemu-devel@nongnu.org; Wed, 21 Jul 2010 12:02:28 -0400 Received: from d01relay03.pok.ibm.com (d01relay03.pok.ibm.com [9.56.227.235]) by e4.ny.us.ibm.com (8.14.4/8.13.1) with ESMTP id o6LFmMP0023403 for ; Wed, 21 Jul 2010 11:48:22 -0400 Received: from d03av02.boulder.ibm.com (d03av02.boulder.ibm.com [9.17.195.168]) by d01relay03.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id o6LG2QNi316770 for ; Wed, 21 Jul 2010 12:02:27 -0400 Received: from d03av02.boulder.ibm.com (loopback [127.0.0.1]) by d03av02.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id o6LG2PUo017807 for ; Wed, 21 Jul 2010 10:02:26 -0600 Received: from localhost.localdomain (elm9m80.beaverton.ibm.com [9.47.81.80]) by d03av02.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id o6LG25Rg015184; Wed, 21 Jul 2010 10:02:24 -0600 From: "Venkateswararao Jujjuri (JV)" To: qemu-devel@nongnu.org Date: Wed, 21 Jul 2010 09:04:53 -0700 Message-Id: <1279728299-28482-19-git-send-email-jvrao@linux.vnet.ibm.com> X-Mailer: git-send-email 1.6.0.6 In-Reply-To: <1279728299-28482-1-git-send-email-jvrao@linux.vnet.ibm.com> References: <1279728299-28482-1-git-send-email-jvrao@linux.vnet.ibm.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) Cc: aliguori@us.ibm.com, Venkateswararao Jujjuri , "Aneesh Kumar K.V" Subject: [Qemu-devel] [PATCH-V2 18/24] virtio-9p: Implement TXATTRWALK X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Aneesh Kumar K.V TXATTRWALK: Descend a ATTR namespace size[4] TXATTRWALK tag[2] fid[4] newfid[4] name[s] size[4] RXATTRWALK tag[2] size[8] txattrwalk gets a fid pointing to xattr. This fid can later be used to get read the xattr value. If name is NULL the fid returned can be used to get the list of extended attribute associated to the file system object. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Venkateswararao Jujjuri --- hw/file-op-9p.h | 3 + hw/virtio-9p-debug.c | 10 +++ hw/virtio-9p-local.c | 14 ++++ hw/virtio-9p.c | 191 +++++++++++++++++++++++++++++++++++++++++++++++++- hw/virtio-9p.h | 14 ++++ 5 files changed, 230 insertions(+), 2 deletions(-) diff --git a/hw/file-op-9p.h b/hw/file-op-9p.h index 120c803..8f466b4 100644 --- a/hw/file-op-9p.h +++ b/hw/file-op-9p.h @@ -75,6 +75,9 @@ typedef struct FileOperations int (*truncate)(FsContext *, const char *, off_t); int (*fsync)(FsContext *, int); int (*statfs)(FsContext *s, const char *path, struct statfs *stbuf); + ssize_t (*lgetxattr)(FsContext *, const char *, const char *, void *, + size_t); + ssize_t (*llistxattr)(FsContext *, const char *, void *, size_t); void *opaque; } FileOperations; #endif diff --git a/hw/virtio-9p-debug.c b/hw/virtio-9p-debug.c index 949a4bf..4554eb6 100644 --- a/hw/virtio-9p-debug.c +++ b/hw/virtio-9p-debug.c @@ -579,6 +579,16 @@ void pprint_pdu(V9fsPDU *pdu) case P9_RWSTAT: fprintf(llogfile, "RWSTAT: ("); break; + case P9_TXATTRWALK: + fprintf(llogfile, "TXATTRWALK: ("); + pprint_int32(pdu, 0, &offset, "fid"); + pprint_int32(pdu, 0, &offset, ", newfid"); + pprint_str(pdu, 0, &offset, ", xattr name"); + break; + case P9_RXATTRWALK: + fprintf(llogfile, "RXATTRWALK: ("); + pprint_int64(pdu, 1, &offset, "xattrsize"); + break; default: fprintf(llogfile, "unknown(%d): (", pdu->id); break; diff --git a/hw/virtio-9p-local.c b/hw/virtio-9p-local.c index 1f72f2e..5a3f5b8 100644 --- a/hw/virtio-9p-local.c +++ b/hw/virtio-9p-local.c @@ -477,6 +477,18 @@ static int local_statfs(FsContext *s, const char *path, struct statfs *stbuf) return statfs(rpath(s, path), stbuf); } +static ssize_t local_lgetxattr(FsContext *ctx, const char *path, + const char *name, void *value, size_t size) +{ + return lgetxattr(rpath(ctx, path), name, value, size); +} + +static ssize_t local_llistxattr(FsContext *ctx, const char *path, + void *value, size_t size) +{ + return llistxattr(rpath(ctx, path), value, size); +} + FileOperations local_ops = { .lstat = local_lstat, .readlink = local_readlink, @@ -505,4 +517,6 @@ FileOperations local_ops = { .remove = local_remove, .fsync = local_fsync, .statfs = local_statfs, + .lgetxattr = local_lgetxattr, + .llistxattr = local_llistxattr, }; diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c index 3e9c525..f0f6195 100644 --- a/hw/virtio-9p.c +++ b/hw/virtio-9p.c @@ -263,6 +263,21 @@ static int v9fs_do_statfs(V9fsState *s, V9fsString *path, struct statfs *stbuf) return s->ops->statfs(&s->ctx, path->data, stbuf); } +static ssize_t v9fs_do_lgetxattr(V9fsState *s, V9fsString *path, + V9fsString *xattr_name, + void *value, size_t size) +{ + return s->ops->lgetxattr(&s->ctx, path->data, + xattr_name->data, value, size); +} + +static ssize_t v9fs_do_llistxattr(V9fsState *s, V9fsString *path, + void *value, size_t size) +{ + return s->ops->llistxattr(&s->ctx, path->data, + value, size); +} + static void v9fs_string_init(V9fsString *str) { str->data = NULL; @@ -1946,6 +1961,31 @@ out: qemu_free(vs); } +static void v9fs_xattr_read(V9fsState *s, V9fsReadState *vs) +{ + ssize_t err = 0; + int read_count; + int64_t xattr_len; + + xattr_len = vs->fidp->fs.xattr.len; + read_count = xattr_len - vs->off; + if (read_count > vs->count) { + read_count = vs->count; + } else if (read_count < 0) { + /* + * read beyond XATTR value + */ + read_count = 0; + } + vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", read_count); + vs->offset += pdu_pack(vs->pdu, vs->offset, + ((char *)vs->fidp->fs.xattr.value) + vs->off, + read_count); + err = vs->offset; + complete_pdu(s, vs->pdu, err); + qemu_free(vs); +} + static void v9fs_read(V9fsState *s, V9fsPDU *pdu) { int32_t fid; @@ -1967,7 +2007,7 @@ static void v9fs_read(V9fsState *s, V9fsPDU *pdu) goto out; } - if (vs->fidp->fs.dir) { + if (vs->fidp->fid_type == P9_FID_DIR && vs->fidp->fs.dir) { vs->max_count = vs->count; vs->count = 0; if (vs->off == 0) { @@ -1975,12 +2015,15 @@ static void v9fs_read(V9fsState *s, V9fsPDU *pdu) } v9fs_read_post_rewinddir(s, vs, err); return; - } else if (vs->fidp->fs.fd != -1) { + } else if (vs->fidp->fid_type == P9_FID_FILE && vs->fidp->fs.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->fs.fd, vs->off, SEEK_SET); v9fs_read_post_lseek(s, vs, err); return; + } else if (vs->fidp->fid_type == P9_FID_XATTR) { + v9fs_xattr_read(s, vs); + return; } else { err = -EINVAL; } @@ -3092,6 +3135,149 @@ out: qemu_free(vs); } +static void v9fs_post_xattr_getvalue(V9fsState *s, V9fsXattrState *vs, int err) +{ + + if (err < 0) { + err = -errno; + free_fid(s, vs->xattr_fidp->fid); + goto out; + } + vs->offset += pdu_marshal(vs->pdu, vs->offset, "q", vs->size); + err = vs->offset; +out: + complete_pdu(s, vs->pdu, err); + v9fs_string_free(&vs->name); + qemu_free(vs); + return; +} + +static void v9fs_post_xattr_check(V9fsState *s, V9fsXattrState *vs, ssize_t err) +{ + if (err < 0) { + err = -errno; + free_fid(s, vs->xattr_fidp->fid); + goto out; + } + /* + * Read the xattr value + */ + vs->xattr_fidp->fs.xattr.len = vs->size; + vs->xattr_fidp->fid_type = P9_FID_XATTR; + vs->xattr_fidp->fs.xattr.copied_len = -1; + if (vs->size) { + vs->xattr_fidp->fs.xattr.value = qemu_malloc(vs->size); + err = v9fs_do_lgetxattr(s, &vs->xattr_fidp->path, + &vs->name, vs->xattr_fidp->fs.xattr.value, + vs->xattr_fidp->fs.xattr.len); + } + v9fs_post_xattr_getvalue(s, vs, err); + return; +out: + complete_pdu(s, vs->pdu, err); + v9fs_string_free(&vs->name); + qemu_free(vs); +} + +static void v9fs_post_lxattr_getvalue(V9fsState *s, V9fsXattrState *vs, int err) +{ + if (err < 0) { + err = -errno; + free_fid(s, vs->xattr_fidp->fid); + goto out; + } + vs->offset += pdu_marshal(vs->pdu, vs->offset, "q", vs->size); + err = vs->offset; +out: + complete_pdu(s, vs->pdu, err); + v9fs_string_free(&vs->name); + qemu_free(vs); + return; +} + +static void v9fs_post_lxattr_check(V9fsState *s, V9fsXattrState *vs, + ssize_t err) +{ + if (err < 0) { + err = -errno; + free_fid(s, vs->xattr_fidp->fid); + goto out; + } + /* + * Read the xattr value + */ + vs->xattr_fidp->fs.xattr.len = vs->size; + vs->xattr_fidp->fid_type = P9_FID_XATTR; + vs->xattr_fidp->fs.xattr.copied_len = -1; + if (vs->size) { + vs->xattr_fidp->fs.xattr.value = qemu_malloc(vs->size); + err = v9fs_do_llistxattr(s, &vs->xattr_fidp->path, + vs->xattr_fidp->fs.xattr.value, + vs->xattr_fidp->fs.xattr.len); + } + v9fs_post_lxattr_getvalue(s, vs, err); + return; +out: + complete_pdu(s, vs->pdu, err); + v9fs_string_free(&vs->name); + qemu_free(vs); +} + +static void v9fs_xattrwalk(V9fsState *s, V9fsPDU *pdu) +{ + ssize_t err = 0; + V9fsXattrState *vs; + int32_t fid, newfid; + + vs = qemu_malloc(sizeof(*vs)); + vs->pdu = pdu; + vs->offset = 7; + + pdu_unmarshal(vs->pdu, vs->offset, "dds", &fid, &newfid, &vs->name); + vs->file_fidp = lookup_fid(s, fid); + if (vs->file_fidp == NULL) { + err = -ENOENT; + goto out; + } + + vs->xattr_fidp = alloc_fid(s, newfid); + if (vs->xattr_fidp == NULL) { + err = -EINVAL; + goto out; + } + + v9fs_string_copy(&vs->xattr_fidp->path, &vs->file_fidp->path); + if (vs->name.data[0] == 0) { + /* + * listxattr request. Get the size first + */ + vs->size = v9fs_do_llistxattr(s, &vs->xattr_fidp->path, + NULL, 0); + if (vs->size < 0) { + err = vs->size; + } + v9fs_post_lxattr_check(s, vs, err); + return; + } else { + /* + * specific xattr fid. We check for xattr + * presence also collect the xattr size + */ + vs->size = v9fs_do_lgetxattr(s, &vs->xattr_fidp->path, + &vs->name, NULL, 0); + if (vs->size < 0) { + err = vs->size; + } + v9fs_post_xattr_check(s, vs, err); + return; + } +out: + complete_pdu(s, vs->pdu, err); + v9fs_string_free(&vs->name); + qemu_free(vs); +} + + typedef void (pdu_handler_t)(V9fsState *s, V9fsPDU *pdu); static pdu_handler_t *pdu_handlers[] = { @@ -3099,6 +3285,7 @@ static pdu_handler_t *pdu_handlers[] = { [P9_TSTATFS] = v9fs_statfs, [P9_TGETATTR] = v9fs_getattr, [P9_TSETATTR] = v9fs_setattr, + [P9_TXATTRWALK] = v9fs_xattrwalk, [P9_TMKNOD] = v9fs_mknod, [P9_TRENAME] = v9fs_rename, [P9_TMKDIR] = v9fs_mkdir, diff --git a/hw/virtio-9p.h b/hw/virtio-9p.h index 3edbdaa..e7a8ea5 100644 --- a/hw/virtio-9p.h +++ b/hw/virtio-9p.h @@ -29,6 +29,8 @@ enum { P9_RGETATTR, P9_TSETATTR = 26, P9_RSETATTR, + P9_TXATTRWALK = 30, + P9_RXATTRWALK, P9_TREADDIR = 40, P9_RREADDIR, P9_TLINK = 70, @@ -416,6 +418,18 @@ typedef struct V9fsRenameState { V9fsString name; } V9fsRenameState; +typedef struct V9fsXattrState +{ + V9fsPDU *pdu; + size_t offset; + V9fsFidState *file_fidp; + V9fsFidState *xattr_fidp; + V9fsString name; + int64_t size; + int flags; + void *value; +} V9fsXattrState; + extern size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count, size_t offset, size_t size, int pack);