[PATCH v3 03/28] timerfd: switch to CLASS(fd)
From: Al Viro <viro@zeniv.linux.org.uk>
Date: 2024-11-02 05:08:44
Also in:
cgroups, kvm, linux-fsdevel
Subsystem:
filesystems (vfs and infrastructure), posix clocks and timers, the rest · Maintainers:
Alexander Viro, Christian Brauner, Anna-Maria Behnsen, Frederic Weisbecker, Thomas Gleixner, Linus Torvalds
Fold timerfd_fget() into both callers to have fdget() and fdput() in the same scope. Could be done in different ways, but this is probably the smallest solution. Reviewed-by: Christian Brauner <brauner@kernel.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> --- fs/timerfd.c | 40 ++++++++++++++-------------------------- 1 file changed, 14 insertions(+), 26 deletions(-)
diff --git a/fs/timerfd.c b/fs/timerfd.c
index 137523e0bb21..4c32244b0508 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c@@ -394,19 +394,6 @@ static const struct file_operations timerfd_fops = { .unlocked_ioctl = timerfd_ioctl, }; -static int timerfd_fget(int fd, struct fd *p) -{ - struct fd f = fdget(fd); - if (!fd_file(f)) - return -EBADF; - if (fd_file(f)->f_op != &timerfd_fops) { - fdput(f); - return -EINVAL; - } - *p = f; - return 0; -} - SYSCALL_DEFINE2(timerfd_create, int, clockid, int, flags) { int ufd;
@@ -471,7 +458,6 @@ static int do_timerfd_settime(int ufd, int flags, const struct itimerspec64 *new, struct itimerspec64 *old) { - struct fd f; struct timerfd_ctx *ctx; int ret;
@@ -479,15 +465,17 @@ static int do_timerfd_settime(int ufd, int flags, !itimerspec64_valid(new)) return -EINVAL; - ret = timerfd_fget(ufd, &f); - if (ret) - return ret; + CLASS(fd, f)(ufd); + if (fd_empty(f)) + return -EBADF; + + if (fd_file(f)->f_op != &timerfd_fops) + return -EINVAL; + ctx = fd_file(f)->private_data; - if (isalarm(ctx) && !capable(CAP_WAKE_ALARM)) { - fdput(f); + if (isalarm(ctx) && !capable(CAP_WAKE_ALARM)) return -EPERM; - } timerfd_setup_cancel(ctx, flags);
@@ -535,17 +523,18 @@ static int do_timerfd_settime(int ufd, int flags, ret = timerfd_setup(ctx, flags, new); spin_unlock_irq(&ctx->wqh.lock); - fdput(f); return ret; } static int do_timerfd_gettime(int ufd, struct itimerspec64 *t) { - struct fd f; struct timerfd_ctx *ctx; - int ret = timerfd_fget(ufd, &f); - if (ret) - return ret; + CLASS(fd, f)(ufd); + + if (fd_empty(f)) + return -EBADF; + if (fd_file(f)->f_op != &timerfd_fops) + return -EINVAL; ctx = fd_file(f)->private_data; spin_lock_irq(&ctx->wqh.lock);
@@ -567,7 +556,6 @@ static int do_timerfd_gettime(int ufd, struct itimerspec64 *t) t->it_value = ktime_to_timespec64(timerfd_get_remaining(ctx)); t->it_interval = ktime_to_timespec64(ctx->tintv); spin_unlock_irq(&ctx->wqh.lock); - fdput(f); return 0; }
--
2.39.5