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a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1709210929; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GuKS5JMiiFYV782dbcVdzQvPQKcEtbDic1ZOTvla/ok=; b=ZD2gnEYcMgdt7jCW2U6rJ0U15CXK0vP/hOrFZU8b3+mgf79YW4aD/0UVqZ2cBzkkqwueCG 4FMa3v2mMaHA+3wgBMO+cT6p27tmrOT9A2cyhFxShd0vZ7WZwNVXHjTUHvDmQJ0u4dRvra 5Mn5wVCFQM+8AG4Gm5a6LJEvP0hVZTM= From: Juergen Gross To: xen-devel@lists.xenproject.org Cc: Juergen Gross , Wei Liu , Julien Grall , Anthony PERARD , Jason Andryuk , Julien Grall Subject: [PATCH v9 3/6] tools/xenstored: mount 9pfs device in stubdom Date: Thu, 29 Feb 2024 13:48:27 +0100 Message-Id: <20240229124830.13680-4-jgross@suse.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240229124830.13680-1-jgross@suse.com> References: <20240229124830.13680-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spam-Level: Authentication-Results: smtp-out1.suse.de; 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charset="utf-8" Mount the 9pfs device in stubdom enabling it to use files. This has to happen in a worker thread in order to allow the main thread handling the required Xenstore accesses in parallel. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk Reviewed-by: Julien Grall --- V3: - add logging in case of errors (Julien Grall) --- tools/xenstored/core.h | 6 +++++ tools/xenstored/domain.c | 2 ++ tools/xenstored/minios.c | 54 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 62 insertions(+) diff --git a/tools/xenstored/core.h b/tools/xenstored/core.h index f6af086f01..fe0ee90581 100644 --- a/tools/xenstored/core.h +++ b/tools/xenstored/core.h @@ -36,6 +36,8 @@ #include "list.h" #include "hashtable.h" =20 +#define XENSTORE_LIB_DIR XEN_LIB_DIR "/xenstore" + #ifndef O_CLOEXEC #define O_CLOEXEC 0 /* O_CLOEXEC support is needed for Live Update in the daemon case. */ @@ -399,6 +401,10 @@ void handle_special_fds(void); int get_socket_fd(void); void set_socket_fd(int fd); =20 +#ifdef __MINIOS__ +void mount_9pfs(void); +#endif + /* Close stdin/stdout/stderr to complete daemonize */ void finish_daemonize(void); =20 diff --git a/tools/xenstored/domain.c b/tools/xenstored/domain.c index 1a7d5e9756..64c8fd0cc3 100644 --- a/tools/xenstored/domain.c +++ b/tools/xenstored/domain.c @@ -1236,6 +1236,8 @@ void stubdom_init(void) barf_perror("Failed to initialize stubdom"); =20 xenevtchn_notify(xce_handle, stubdom->port); + + mount_9pfs(); #endif } =20 diff --git a/tools/xenstored/minios.c b/tools/xenstored/minios.c index 22ac8defbd..562a9b4972 100644 --- a/tools/xenstored/minios.c +++ b/tools/xenstored/minios.c @@ -17,10 +17,20 @@ */ #include #include +#include +#include "talloc.h" #include "core.h" #include "utils.h" #include #include +#include +#include +#include +#include + +#define P9_STATE_PATH "device/9pfs/0/state" + +static void *p9_device; =20 void finish_daemonize(void) { @@ -74,3 +84,47 @@ int get_socket_fd(void) void set_socket_fd(int fd) { } + +static void mount_thread(void *p) +{ + xenbus_event_queue events =3D NULL; + char *err; + char *dummy; + + err =3D xenbus_watch_path_token(XBT_NIL, P9_STATE_PATH, "9pfs", &events); + if (err) { + log("error \"%s\" when setting watch on \"%s\"\n", err, + P9_STATE_PATH); + free(err); + return; + } + + for (;;) { + xenbus_wait_for_watch(&events); + + /* + * We only care for existence of the state node. + * State changes are handled in init_9pfront(). + */ + err =3D xenbus_read(XBT_NIL, P9_STATE_PATH, &dummy); + if (!err) + break; + free(err); + } + + free(dummy); + + err =3D xenbus_unwatch_path_token(XBT_NIL, P9_STATE_PATH, "9pfs"); + if (err) { + log("error \"%s\" when unwatching \"%s\", leaking watch\n", + err, P9_STATE_PATH); + free(err); + } + + p9_device =3D init_9pfront(0, XENSTORE_LIB_DIR); +} + +void mount_9pfs(void) +{ + create_thread("mount-9pfs", mount_thread, NULL); +} --=20 2.35.3