Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#define _GNU_SOURCE
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#include <fcntl.h>
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#include <assert.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include "kselftest.h"
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static int lock_set(int fd, struct flock *fl)
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{
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int ret;
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fl->l_pid = 0; // needed for OFD locks
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fl->l_whence = SEEK_SET;
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ret = fcntl(fd, F_OFD_SETLK, fl);
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if (ret)
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perror("fcntl()");
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return ret;
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}
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static int lock_get(int fd, struct flock *fl)
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{
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int ret;
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fl->l_pid = 0; // needed for OFD locks
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fl->l_whence = SEEK_SET;
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ret = fcntl(fd, F_OFD_GETLK, fl);
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if (ret)
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perror("fcntl()");
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return ret;
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}
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int main(void)
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{
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int rc;
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struct flock fl, fl2;
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int fd = open("/tmp/aa", O_RDWR | O_CREAT | O_EXCL, 0600);
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int fd2 = open("/tmp/aa", O_RDONLY);
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unlink("/tmp/aa");
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assert(fd != -1);
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assert(fd2 != -1);
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ksft_print_msg("[INFO] opened fds %i %i\n", fd, fd2);
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/* Set some read lock */
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fl.l_type = F_RDLCK;
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fl.l_start = 5;
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fl.l_len = 3;
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rc = lock_set(fd, &fl);
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if (rc == 0) {
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ksft_print_msg
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("[SUCCESS] set OFD read lock on first fd\n");
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} else {
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ksft_print_msg("[FAIL] to set OFD read lock on first fd\n");
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return -1;
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}
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/* Make sure read locks do not conflict on different fds. */
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fl.l_type = F_RDLCK;
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fl.l_start = 5;
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fl.l_len = 1;
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rc = lock_get(fd2, &fl);
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if (rc != 0)
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return -1;
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if (fl.l_type != F_UNLCK) {
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ksft_print_msg("[FAIL] read locks conflicted\n");
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return -1;
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}
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/* Make sure read/write locks do conflict on different fds. */
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fl.l_type = F_WRLCK;
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fl.l_start = 5;
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fl.l_len = 1;
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rc = lock_get(fd2, &fl);
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if (rc != 0)
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return -1;
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if (fl.l_type != F_UNLCK) {
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ksft_print_msg
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("[SUCCESS] read and write locks conflicted\n");
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} else {
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ksft_print_msg
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("[SUCCESS] read and write locks not conflicted\n");
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return -1;
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}
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/* Get info about the lock on first fd. */
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fl.l_type = F_UNLCK;
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fl.l_start = 5;
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fl.l_len = 1;
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rc = lock_get(fd, &fl);
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if (rc != 0) {
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ksft_print_msg
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("[FAIL] F_OFD_GETLK with F_UNLCK not supported\n");
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return -1;
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}
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if (fl.l_type != F_UNLCK) {
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ksft_print_msg
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("[SUCCESS] F_UNLCK test returns: locked, type %i pid %i len %zi\n",
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fl.l_type, fl.l_pid, fl.l_len);
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} else {
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ksft_print_msg
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("[FAIL] F_OFD_GETLK with F_UNLCK did not return lock info\n");
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return -1;
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}
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/* Try the same but by locking everything by len==0. */
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fl2.l_type = F_UNLCK;
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fl2.l_start = 0;
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fl2.l_len = 0;
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rc = lock_get(fd, &fl2);
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if (rc != 0) {
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ksft_print_msg
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("[FAIL] F_OFD_GETLK with F_UNLCK not supported\n");
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return -1;
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}
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if (memcmp(&fl, &fl2, sizeof(fl))) {
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ksft_print_msg
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("[FAIL] F_UNLCK test returns: locked, type %i pid %i len %zi\n",
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fl.l_type, fl.l_pid, fl.l_len);
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return -1;
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}
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ksft_print_msg("[SUCCESS] F_UNLCK with len==0 returned the same\n");
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/* Get info about the lock on second fd - no locks on it. */
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fl.l_type = F_UNLCK;
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fl.l_start = 0;
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fl.l_len = 0;
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lock_get(fd2, &fl);
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if (fl.l_type != F_UNLCK) {
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ksft_print_msg
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("[FAIL] F_OFD_GETLK with F_UNLCK return lock info from another fd\n");
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return -1;
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}
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return 0;
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}
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