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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Test hugetlbfs quota accounting with filesystem size limits to check for regressions in quota handling for MAP_PRIVATE and MAP_SHARED pages. Signed-off-by: Pavithra --- v2 -> v3: - Remove kernel_has_private_reservations() workaround; always expect QUOTA_FAIL per LTP policy of not working around kernel bugs - Add linux-git tag and description referencing commit a1e78772d72b which introduced MAP_PRIVATE reservations at mmap() time - Replace EXPECT_SUCCESS/SIGNAL/FAILURE with QUOTA_OK/FAIL/COW_FAIL to describe expected kernel behaviour rather than exit codes - Report TPASS/TFAIL directly in do_map() child at point of outcome instead of propagating result via exit status - Use single hugetlbfs mount with size= on MNTPOINT directly instead of a redundant second mount on a subdirectory - Drop .needs_hugetlbfs; test mounts its own quota-limited instance - Fix verify_quota_stat() to report TPASS on success - Fix split string literal checkpatch warning link to v2: https://lore.kernel.org/ltp/20260717160234.1163566-1-pavrampu@linux.ibm.com/ --- runtest/hugetlb | 1 + testcases/kernel/mem/.gitignore | 1 + .../kernel/mem/hugetlb/hugemmap/hugemmap33.c | 222 ++++++++++++++++++ 3 files changed, 224 insertions(+) create mode 100644 testcases/kernel/mem/hugetlb/hugemmap/hugemmap33.c diff --git a/runtest/hugetlb b/runtest/hugetlb index 6b35c1f42..c83955987 100644 --- a/runtest/hugetlb +++ b/runtest/hugetlb @@ -35,6 +35,7 @@ hugemmap29 hugemmap29 hugemmap30 hugemmap30 hugemmap31 hugemmap31 hugemmap32 hugemmap32 +hugemmap33 hugemmap33 hugemmap34 hugemmap34 hugemmap35 hugemmap35 hugemmap36 hugemmap36 diff --git a/testcases/kernel/mem/.gitignore b/testcases/kernel/mem/.gitignore index e63a6dde7..f4c3dd1b0 100644 --- a/testcases/kernel/mem/.gitignore +++ b/testcases/kernel/mem/.gitignore @@ -35,6 +35,7 @@ /hugetlb/hugemmap/hugemmap30 /hugetlb/hugemmap/hugemmap31 /hugetlb/hugemmap/hugemmap32 +/hugetlb/hugemmap/hugemmap33 /hugetlb/hugemmap/hugemmap34 /hugetlb/hugemmap/hugemmap35 /hugetlb/hugemmap/hugemmap36 diff --git a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap33.c b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap33.c new file mode 100644 index 000000000..c66ec1d78 --- /dev/null +++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap33.c @@ -0,0 +1,222 @@ +// SPDX-License-Identifier: LGPL-2.1-or-later +/* + * Copyright (C) 2005-2007 David Gibson & Adam Litke, IBM Corporation. + * Copyright (c) Linux Test Project, 2024 + * Copyright (C) 2025-2026 Naveed & Pavithra, IBM Corporation. + * Assisted with AI tools + */ + +/*\ + * Test hugetlbfs quota accounting with filesystem size limits. + * + * The number of global huge pages available to a mounted hugetlbfs filesystem + * can be limited using a quota mechanism by setting the size attribute at + * mount time. Older kernels did not properly handle quota accounting for + * MAP_PRIVATE pages and MAP_SHARED reservations. + * + * Commit a1e78772d72b introduced MAP_PRIVATE reservations at mmap() time, + * so quota is checked upfront and mmap() fails with ENOMEM when over quota. + * Before this, quota was only checked at fault time resulting in SIGBUS. + * + * Root is required to mount the quota-limited hugetlbfs instance. + */ + +#define _GNU_SOURCE +#include +#include +#include +#include +#include + +#include "hugetlb.h" + +#define MNTPOINT "hugetlbfs/" + +static long hpage_size; +static int quota_mounted; + +/* map action flags */ +#define ACTION_COW 0x0001 +#define ACTION_TOUCH 0x0002 + +/* Expected outcome for a quota test */ +#define QUOTA_OK 0 +#define QUOTA_FAIL 1 +#define QUOTA_COW_FAIL 2 + +static void verify_quota_stat(long tot, long free, long avail) +{ + struct statfs s; + + SAFE_STATFS(MNTPOINT, &s); + + if ((long)s.f_blocks != tot || (long)s.f_bfree != free || (long)s.f_bavail != avail) { + tst_res(TFAIL, "Bad quota counters: total=%li free=%li avail=%li, expected %li %li %li", + (long)s.f_blocks, (long)s.f_bfree, (long)s.f_bavail, + tot, free, avail); + return; + } + tst_res(TPASS, "Quota counters are correct: total=%li free=%li avail=%li", + tot, free, avail); +} + +static void do_map(unsigned long size, int mmap_flags, int action_flags, + int expected) +{ + int fd; + char *a = MAP_FAILED, *b, *c = MAP_FAILED; + char path[PATH_MAX + 32]; + + snprintf(path, sizeof(path), "%s/test_file_%d", MNTPOINT, getpid()); + fd = SAFE_OPEN(path, O_CREAT | O_RDWR, 0600); + SAFE_UNLINK(path); + + a = mmap(NULL, size, PROT_READ | PROT_WRITE, mmap_flags, fd, 0); + if (a == MAP_FAILED) { + if (expected == QUOTA_FAIL && + (errno == ENOMEM || errno == ENOSPC)) { + tst_res(TPASS | TERRNO, "mmap failed as expected due to quota"); + SAFE_CLOSE(fd); + return; + } + tst_res(TFAIL | TERRNO, "mmap failed unexpectedly"); + SAFE_CLOSE(fd); + return; + } + + if (expected == QUOTA_FAIL) { + tst_res(TFAIL, "mmap succeeded but quota exhaustion was expected"); + goto cleanup_a; + } + + if (action_flags & ACTION_TOUCH) { + for (b = a; b < a + size; b += hpage_size) + *b = 1; + } + + if (action_flags & ACTION_COW) { + c = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); + if (c == MAP_FAILED) { + if (expected == QUOTA_COW_FAIL && + (errno == ENOMEM || errno == ENOSPC)) { + tst_res(TPASS | TERRNO, "COW mmap failed as expected due to quota"); + goto cleanup_a; + } + tst_res(TFAIL | TERRNO, "COW mmap failed unexpectedly"); + goto cleanup_a; + } + + if (expected == QUOTA_COW_FAIL) { + tst_res(TFAIL, "COW mmap succeeded but quota exhaustion was expected"); + goto cleanup_c; + } + + if (*c != 1) { + tst_res(TFAIL, "Data mismatch when setting up COW"); + goto cleanup_c; + } + *c = 0; + SAFE_MUNMAP(c, size); + } + + if (expected == QUOTA_OK) + tst_res(TPASS, "Quota test passed as expected"); + + SAFE_MUNMAP(a, size); + SAFE_CLOSE(fd); + return; + +cleanup_c: + SAFE_MUNMAP(c, size); +cleanup_a: + SAFE_MUNMAP(a, size); + SAFE_CLOSE(fd); +} + +static void run_quota_test(int expected, + unsigned long size, int mmap_flags, + int action_flags) +{ + pid_t pid; + int status; + + pid = SAFE_FORK(); + if (pid == 0) { + do_map(size, mmap_flags, action_flags, expected); + exit(0); + } + + SAFE_WAITPID(pid, &status, 0); + + if (WIFSIGNALED(status)) + tst_res(TFAIL, "Child killed by unexpected signal %d", WTERMSIG(status)); +} + +static void run_test(void) +{ + tst_res(TINFO, "Testing unused quota cleanup for untouched mappings"); + run_quota_test(QUOTA_OK, hpage_size, MAP_PRIVATE, 0); + verify_quota_stat(1, 1, 1); + run_quota_test(QUOTA_OK, hpage_size, MAP_SHARED, 0); + verify_quota_stat(1, 1, 1); + + tst_res(TINFO, "Testing page instantiation within quota limits"); + run_quota_test(QUOTA_OK, hpage_size, MAP_PRIVATE, ACTION_TOUCH); + run_quota_test(QUOTA_OK, hpage_size, MAP_SHARED, ACTION_TOUCH); + + tst_res(TINFO, "Testing page instantiation over quota"); + run_quota_test(QUOTA_FAIL, 2 * hpage_size, MAP_SHARED, ACTION_TOUCH); + + tst_res(TINFO, "Testing private mapping quota check"); + run_quota_test(QUOTA_FAIL, 2 * hpage_size, MAP_PRIVATE, ACTION_TOUCH); + + tst_res(TINFO, "Testing COW over quota"); + run_quota_test(QUOTA_COW_FAIL, hpage_size, MAP_SHARED, + ACTION_TOUCH | ACTION_COW); + run_quota_test(QUOTA_COW_FAIL, hpage_size, MAP_PRIVATE, + ACTION_TOUCH | ACTION_COW); + + tst_res(TINFO, "Testing operations within quota after failures"); + run_quota_test(QUOTA_OK, hpage_size, MAP_SHARED, ACTION_TOUCH); + run_quota_test(QUOTA_OK, hpage_size, MAP_PRIVATE, ACTION_TOUCH); +} + +static void setup(void) +{ + char mount_opts[BUFSIZ]; + + hpage_size = tst_get_hugepage_size(); + + snprintf(mount_opts, sizeof(mount_opts), "size=%luK", + hpage_size / 1024); + + if (mount("none", MNTPOINT, "hugetlbfs", 0, mount_opts) == -1) { + if (errno == ENODEV) + tst_brk(TCONF, "hugetlbfs not supported"); + tst_brk(TBROK | TERRNO, "mount() failed"); + } + quota_mounted = 1; + + tst_res(TINFO, "Mounted hugetlbfs with quota at %s (size=%luK)", + MNTPOINT, hpage_size / 1024); +} + +static void cleanup(void) +{ + if (quota_mounted) + SAFE_UMOUNT(MNTPOINT); +} + +static struct tst_test test = { + .tags = (struct tst_tag[]) { + {"linux-git", "a1e78772d72b"}, + {} + }, + .needs_root = 1, + .mntpoint = MNTPOINT, + .forks_child = 1, + .setup = setup, + .cleanup = cleanup, + .test_all = run_test, + .hugepages = {2, TST_NEEDS}, +}; 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