{"id":2227296,"url":"http://patchwork.ozlabs.org/api/patches/2227296/?format=json","web_url":"http://patchwork.ozlabs.org/project/ltp/patch/20260423120309.18049-6-chrubis@suse.cz/","project":{"id":59,"url":"http://patchwork.ozlabs.org/api/projects/59/?format=json","name":"Linux Test Project development","link_name":"ltp","list_id":"ltp.lists.linux.it","list_email":"ltp@lists.linux.it","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260423120309.18049-6-chrubis@suse.cz>","list_archive_url":null,"date":"2026-04-23T12:03:06","name":"[v2,5/8] syscalls: Add epoll_wait10","commit_ref":null,"pull_url":null,"state":"needs-review-ack","archived":false,"hash":"a5f15d5c43e1af6fa64c8d1e8f04c8c6d1ca572a","submitter":{"id":8530,"url":"http://patchwork.ozlabs.org/api/people/8530/?format=json","name":"Cyril Hrubis","email":"chrubis@suse.cz"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/ltp/patch/20260423120309.18049-6-chrubis@suse.cz/mbox/","series":[{"id":501188,"url":"http://patchwork.ozlabs.org/api/series/501188/?format=json","web_url":"http://patchwork.ozlabs.org/project/ltp/list/?series=501188","date":"2026-04-23T12:03:01","name":"Add more epoll tests","version":2,"mbox":"http://patchwork.ozlabs.org/series/501188/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2227296/comments/","check":"warning","checks":"http://patchwork.ozlabs.org/api/patches/2227296/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=suse.cz header.i=@suse.cz header.a=rsa-sha256\n header.s=susede2_rsa header.b=rDO3FIIU;\n\tdkim=fail reason=\"signature verification failed\" header.d=suse.cz\n header.i=@suse.cz header.a=ed25519-sha256 header.s=susede2_ed25519\n header.b=GzNF/erE;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key)\n header.d=suse.cz header.i=@suse.cz header.a=rsa-sha256 header.s=susede2_rsa\n header.b=m+znCgLX;\n\tdkim=neutral header.d=suse.cz header.i=@suse.cz header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=GbMpUscf;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=213.254.12.146; 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charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Errors-To":"ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it","Sender":"\"ltp\" "},"content":"Functional test for EPOLLPRI using /proc/mounts that produces POLLPRI\nwhen a filesystem is mounted/umounted.\n\nSigned-off-by: Cyril Hrubis \n---\n runtest/syscalls | 1 +\n .../kernel/syscalls/epoll_wait/.gitignore | 1 +\n .../kernel/syscalls/epoll_wait/epoll_wait10.c | 107 ++++++++++++++++++\n 3 files changed, 109 insertions(+)\n create mode 100644 testcases/kernel/syscalls/epoll_wait/epoll_wait10.c","diff":"diff --git a/runtest/syscalls b/runtest/syscalls\nindex b302935d5..3fd61b814 100644\n--- a/runtest/syscalls\n+++ b/runtest/syscalls\n@@ -198,6 +198,7 @@ epoll_wait06 epoll_wait06\n epoll_wait07 epoll_wait07\n epoll_wait08 epoll_wait08\n epoll_wait09 epoll_wait09\n+epoll_wait10 epoll_wait10\n \n epoll_pwait01 epoll_pwait01\n epoll_pwait02 epoll_pwait02\ndiff --git a/testcases/kernel/syscalls/epoll_wait/.gitignore b/testcases/kernel/syscalls/epoll_wait/.gitignore\nindex f32ec535b..30139375d 100644\n--- a/testcases/kernel/syscalls/epoll_wait/.gitignore\n+++ b/testcases/kernel/syscalls/epoll_wait/.gitignore\n@@ -7,3 +7,4 @@ epoll_wait06\n epoll_wait07\n epoll_wait08\n epoll_wait09\n+epoll_wait10\ndiff --git a/testcases/kernel/syscalls/epoll_wait/epoll_wait10.c b/testcases/kernel/syscalls/epoll_wait/epoll_wait10.c\nnew file mode 100644\nindex 000000000..82cd8b15e\n--- /dev/null\n+++ b/testcases/kernel/syscalls/epoll_wait/epoll_wait10.c\n@@ -0,0 +1,107 @@\n+// SPDX-License-Identifier: GPL-2.0-or-later\n+/*\n+ * Copyright (c) 2026 Cyril Hrubis \n+ */\n+\n+/*\\\n+ * Verify that epoll_wait with EPOLLPRI detects changes to /proc/mounts.\n+ *\n+ * The kernel generates a poll notification (POLLPRI/EPOLLERR) on\n+ * /proc/mounts whenever the mount namespace changes. This test verifies\n+ * that epoll can observe these notifications.\n+ *\n+ * [Algorithm]\n+ *\n+ * - Open /proc/mounts and register it with an epoll instance for EPOLLPRI.\n+ * - Fork a child that mounts and then unmounts a tmpfs filesystem, using\n+ * checkpoints to synchronize with the parent.\n+ * - After each mount namespace change the parent calls epoll_wait and verifies\n+ * it returns an event.\n+ *\n+ * Needs root to call mount/umount.\n+ */\n+\n+#include \n+\n+#include \"tst_test.h\"\n+#include \"tst_epoll.h\"\n+\n+#define MNTPOINT \"mnt_epoll\"\n+\n+static int efd = -1, mnt_fd = -1;\n+\n+static void setup(void)\n+{\n+\tSAFE_MKDIR(MNTPOINT, 0777);\n+\n+\tmnt_fd = SAFE_OPEN(\"/proc/mounts\", O_RDONLY);\n+\n+\tefd = SAFE_EPOLL_CREATE1(0);\n+\n+\tstruct epoll_event ev = {\n+\t\t.events = EPOLLPRI,\n+\t\t.data.fd = mnt_fd,\n+\t};\n+\n+\tSAFE_EPOLL_CTL(efd, EPOLL_CTL_ADD, mnt_fd, &ev);\n+}\n+\n+static void check_epoll_event(const char *desc)\n+{\n+\tstruct epoll_event ret_ev;\n+\tchar buf[1024];\n+\n+\tTEST(epoll_wait(efd, &ret_ev, 1, 1000));\n+\tif (TST_RET < 1) {\n+\t\ttst_res(TFAIL | TTERRNO,\n+\t\t\t\"epoll_wait() after %s returned %li\", desc, TST_RET);\n+\t} else if (!(ret_ev.events & (EPOLLPRI | EPOLLERR))) {\n+\t\ttst_res(TFAIL,\n+\t\t\t\"after %s: events %x, expected EPOLLPRI or EPOLLERR\",\n+\t\t\tdesc, ret_ev.events);\n+\t} else {\n+\t\ttst_res(TPASS,\n+\t\t\t\"epoll_wait() reported event after %s\", desc);\n+\t}\n+\n+\t/* Re-read /proc/self/mounts to clear the notification */\n+\tSAFE_LSEEK(mnt_fd, 0, SEEK_SET);\n+\twhile (SAFE_READ(0, mnt_fd, buf, sizeof(buf)) > 0)\n+\t\t;\n+}\n+\n+static void run(void)\n+{\n+\tif (!SAFE_FORK()) {\n+\t\tSAFE_MOUNT(\"none\", MNTPOINT, \"tmpfs\", 0, NULL);\n+\t\tTST_CHECKPOINT_WAKE_AND_WAIT(0);\n+\t\tSAFE_UMOUNT(MNTPOINT);\n+\t\tTST_CHECKPOINT_WAKE(0);\n+\t\texit(0);\n+\t}\n+\n+\tTST_CHECKPOINT_WAIT(0);\n+\tcheck_epoll_event(\"mount\");\n+\n+\tTST_CHECKPOINT_WAKE_AND_WAIT(0);\n+\tcheck_epoll_event(\"umount\");\n+}\n+\n+static void cleanup(void)\n+{\n+\tif (efd != -1)\n+\t\tSAFE_CLOSE(efd);\n+\n+\tif (mnt_fd != -1)\n+\t\tSAFE_CLOSE(mnt_fd);\n+}\n+\n+static struct tst_test test = {\n+\t.test_all = run,\n+\t.setup = setup,\n+\t.cleanup = cleanup,\n+\t.needs_root = 1,\n+\t.forks_child = 1,\n+\t.needs_checkpoints = 1,\n+\t.needs_tmpdir = 1,\n+};\n","prefixes":["v2","5/8"]}