From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/fs/utimes.c | 200 +++++++++++++++++++++++++------------------------
1 files changed, 102 insertions(+), 98 deletions(-)
diff --git a/kernel/fs/utimes.c b/kernel/fs/utimes.c
index 1039ef7..fd3cc42 100644
--- a/kernel/fs/utimes.c
+++ b/kernel/fs/utimes.c
@@ -8,35 +8,6 @@
#include <linux/compat.h>
#include <asm/unistd.h>
-#ifdef __ARCH_WANT_SYS_UTIME
-
-/*
- * sys_utime() can be implemented in user-level using sys_utimes().
- * Is this for backwards compatibility? If so, why not move it
- * into the appropriate arch directory (for those architectures that
- * need it).
- */
-
-/* If times==NULL, set access and modification to current time,
- * must be owner or have write permission.
- * Else, update from *times, must be owner or super user.
- */
-SYSCALL_DEFINE2(utime, char __user *, filename, struct utimbuf __user *, times)
-{
- struct timespec64 tv[2];
-
- if (times) {
- if (get_user(tv[0].tv_sec, ×->actime) ||
- get_user(tv[1].tv_sec, ×->modtime))
- return -EFAULT;
- tv[0].tv_nsec = 0;
- tv[1].tv_nsec = 0;
- }
- return do_utimes(AT_FDCWD, filename, times ? tv : NULL, 0);
-}
-
-#endif
-
static bool nsec_valid(long nsec)
{
if (nsec == UTIME_OMIT || nsec == UTIME_NOW)
@@ -45,36 +16,39 @@
return nsec >= 0 && nsec <= 999999999;
}
-static int utimes_common(const struct path *path, struct timespec64 *times)
+int vfs_utimes(const struct path *path, struct timespec64 *times)
{
int error;
struct iattr newattrs;
struct inode *inode = path->dentry->d_inode;
struct inode *delegated_inode = NULL;
+ if (times) {
+ if (!nsec_valid(times[0].tv_nsec) ||
+ !nsec_valid(times[1].tv_nsec))
+ return -EINVAL;
+ if (times[0].tv_nsec == UTIME_NOW &&
+ times[1].tv_nsec == UTIME_NOW)
+ times = NULL;
+ }
+
error = mnt_want_write(path->mnt);
if (error)
goto out;
-
- if (times && times[0].tv_nsec == UTIME_NOW &&
- times[1].tv_nsec == UTIME_NOW)
- times = NULL;
newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
if (times) {
if (times[0].tv_nsec == UTIME_OMIT)
newattrs.ia_valid &= ~ATTR_ATIME;
else if (times[0].tv_nsec != UTIME_NOW) {
- newattrs.ia_atime.tv_sec = times[0].tv_sec;
- newattrs.ia_atime.tv_nsec = times[0].tv_nsec;
+ newattrs.ia_atime = times[0];
newattrs.ia_valid |= ATTR_ATIME_SET;
}
if (times[1].tv_nsec == UTIME_OMIT)
newattrs.ia_valid &= ~ATTR_MTIME;
else if (times[1].tv_nsec != UTIME_NOW) {
- newattrs.ia_mtime.tv_sec = times[1].tv_sec;
- newattrs.ia_mtime.tv_nsec = times[1].tv_nsec;
+ newattrs.ia_mtime = times[1];
newattrs.ia_valid |= ATTR_MTIME_SET;
}
/*
@@ -88,7 +62,7 @@
}
retry_deleg:
inode_lock(inode);
- error = notify_change2(path->mnt, path->dentry, &newattrs, &delegated_inode);
+ error = notify_change(path->dentry, &newattrs, &delegated_inode);
inode_unlock(inode);
if (delegated_inode) {
error = break_deleg_wait(&delegated_inode);
@@ -98,6 +72,51 @@
mnt_drop_write(path->mnt);
out:
+ return error;
+}
+
+static int do_utimes_path(int dfd, const char __user *filename,
+ struct timespec64 *times, int flags)
+{
+ struct path path;
+ int lookup_flags = 0, error;
+
+ if (flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH))
+ return -EINVAL;
+
+ if (!(flags & AT_SYMLINK_NOFOLLOW))
+ lookup_flags |= LOOKUP_FOLLOW;
+ if (flags & AT_EMPTY_PATH)
+ lookup_flags |= LOOKUP_EMPTY;
+
+retry:
+ error = user_path_at(dfd, filename, lookup_flags, &path);
+ if (error)
+ return error;
+
+ error = vfs_utimes(&path, times);
+ path_put(&path);
+ if (retry_estale(error, lookup_flags)) {
+ lookup_flags |= LOOKUP_REVAL;
+ goto retry;
+ }
+
+ return error;
+}
+
+static int do_utimes_fd(int fd, struct timespec64 *times, int flags)
+{
+ struct fd f;
+ int error;
+
+ if (flags)
+ return -EINVAL;
+
+ f = fdget(fd);
+ if (!f.file)
+ return -EBADF;
+ error = vfs_utimes(&f.file->f_path, times);
+ fdput(f);
return error;
}
@@ -119,54 +138,13 @@
long do_utimes(int dfd, const char __user *filename, struct timespec64 *times,
int flags)
{
- int error = -EINVAL;
-
- if (times && (!nsec_valid(times[0].tv_nsec) ||
- !nsec_valid(times[1].tv_nsec))) {
- goto out;
- }
-
- if (flags & ~AT_SYMLINK_NOFOLLOW)
- goto out;
-
- if (filename == NULL && dfd != AT_FDCWD) {
- struct fd f;
-
- if (flags & AT_SYMLINK_NOFOLLOW)
- goto out;
-
- f = fdget(dfd);
- error = -EBADF;
- if (!f.file)
- goto out;
-
- error = utimes_common(&f.file->f_path, times);
- fdput(f);
- } else {
- struct path path;
- int lookup_flags = 0;
-
- if (!(flags & AT_SYMLINK_NOFOLLOW))
- lookup_flags |= LOOKUP_FOLLOW;
-retry:
- error = user_path_at(dfd, filename, lookup_flags, &path);
- if (error)
- goto out;
-
- error = utimes_common(&path, times);
- path_put(&path);
- if (retry_estale(error, lookup_flags)) {
- lookup_flags |= LOOKUP_REVAL;
- goto retry;
- }
- }
-
-out:
- return error;
+ if (filename == NULL && dfd != AT_FDCWD)
+ return do_utimes_fd(dfd, times, flags);
+ return do_utimes_path(dfd, filename, times, flags);
}
SYSCALL_DEFINE4(utimensat, int, dfd, const char __user *, filename,
- struct timespec __user *, utimes, int, flags)
+ struct __kernel_timespec __user *, utimes, int, flags)
{
struct timespec64 tstimes[2];
@@ -184,10 +162,17 @@
return do_utimes(dfd, filename, utimes ? tstimes : NULL, flags);
}
+#ifdef __ARCH_WANT_SYS_UTIME
+/*
+ * futimesat(), utimes() and utime() are older versions of utimensat()
+ * that are provided for compatibility with traditional C libraries.
+ * On modern architectures, we always use libc wrappers around
+ * utimensat() instead.
+ */
static long do_futimesat(int dfd, const char __user *filename,
- struct timeval __user *utimes)
+ struct __kernel_old_timeval __user *utimes)
{
- struct timeval times[2];
+ struct __kernel_old_timeval times[2];
struct timespec64 tstimes[2];
if (utimes) {
@@ -214,24 +199,40 @@
SYSCALL_DEFINE3(futimesat, int, dfd, const char __user *, filename,
- struct timeval __user *, utimes)
+ struct __kernel_old_timeval __user *, utimes)
{
return do_futimesat(dfd, filename, utimes);
}
SYSCALL_DEFINE2(utimes, char __user *, filename,
- struct timeval __user *, utimes)
+ struct __kernel_old_timeval __user *, utimes)
{
return do_futimesat(AT_FDCWD, filename, utimes);
}
-#ifdef CONFIG_COMPAT
+SYSCALL_DEFINE2(utime, char __user *, filename, struct utimbuf __user *, times)
+{
+ struct timespec64 tv[2];
+
+ if (times) {
+ if (get_user(tv[0].tv_sec, ×->actime) ||
+ get_user(tv[1].tv_sec, ×->modtime))
+ return -EFAULT;
+ tv[0].tv_nsec = 0;
+ tv[1].tv_nsec = 0;
+ }
+ return do_utimes(AT_FDCWD, filename, times ? tv : NULL, 0);
+}
+#endif
+
+#ifdef CONFIG_COMPAT_32BIT_TIME
/*
* Not all architectures have sys_utime, so implement this in terms
* of sys_utimes.
*/
-COMPAT_SYSCALL_DEFINE2(utime, const char __user *, filename,
- struct compat_utimbuf __user *, t)
+#ifdef __ARCH_WANT_SYS_UTIME32
+SYSCALL_DEFINE2(utime32, const char __user *, filename,
+ struct old_utimbuf32 __user *, t)
{
struct timespec64 tv[2];
@@ -244,14 +245,15 @@
}
return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
}
+#endif
-COMPAT_SYSCALL_DEFINE4(utimensat, unsigned int, dfd, const char __user *, filename, struct compat_timespec __user *, t, int, flags)
+SYSCALL_DEFINE4(utimensat_time32, unsigned int, dfd, const char __user *, filename, struct old_timespec32 __user *, t, int, flags)
{
struct timespec64 tv[2];
if (t) {
- if (compat_get_timespec64(&tv[0], &t[0]) ||
- compat_get_timespec64(&tv[1], &t[1]))
+ if (get_old_timespec32(&tv[0], &t[0]) ||
+ get_old_timespec32(&tv[1], &t[1]))
return -EFAULT;
if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
@@ -260,8 +262,9 @@
return do_utimes(dfd, filename, t ? tv : NULL, flags);
}
+#ifdef __ARCH_WANT_SYS_UTIME32
static long do_compat_futimesat(unsigned int dfd, const char __user *filename,
- struct compat_timeval __user *t)
+ struct old_timeval32 __user *t)
{
struct timespec64 tv[2];
@@ -280,15 +283,16 @@
return do_utimes(dfd, filename, t ? tv : NULL, 0);
}
-COMPAT_SYSCALL_DEFINE3(futimesat, unsigned int, dfd,
+SYSCALL_DEFINE3(futimesat_time32, unsigned int, dfd,
const char __user *, filename,
- struct compat_timeval __user *, t)
+ struct old_timeval32 __user *, t)
{
return do_compat_futimesat(dfd, filename, t);
}
-COMPAT_SYSCALL_DEFINE2(utimes, const char __user *, filename, struct compat_timeval __user *, t)
+SYSCALL_DEFINE2(utimes_time32, const char __user *, filename, struct old_timeval32 __user *, t)
{
return do_compat_futimesat(AT_FDCWD, filename, t);
}
#endif
+#endif
--
Gitblit v1.6.2