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From: Christoph Hellwig <hch@lst.de>
To: Al Viro <viro@zeniv.linux.org.uk>,
	Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/4] fs: refactor do_utimes
Date: Wed, 15 Jul 2020 08:54:31 +0200	[thread overview]
Message-ID: <20200715065434.2550-2-hch@lst.de> (raw)
In-Reply-To: <20200715065434.2550-1-hch@lst.de>

Split out one helper each for path vs fd based operations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/utimes.c | 100 ++++++++++++++++++++++++++++------------------------
 1 file changed, 54 insertions(+), 46 deletions(-)

diff --git a/fs/utimes.c b/fs/utimes.c
index b7b927502d6e43..c667517b6eb110 100644
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -70,6 +70,57 @@ static int utimes_common(const struct path *path, struct timespec64 *times)
 	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 (times &&
+	    (!nsec_valid(times[0].tv_nsec) || !nsec_valid(times[1].tv_nsec)))
+		return -EINVAL;
+	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 = utimes_common(&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 (times &&
+	    (!nsec_valid(times[0].tv_nsec) || !nsec_valid(times[1].tv_nsec)))
+		return -EINVAL;
+	if (flags)
+		return -EINVAL;
+
+	f = fdget(fd);
+	if (!f.file)
+		return -EBADF;
+	error = utimes_common(&f.file->f_path, times);
+	fdput(f);
+	return error;
+}
+
 /*
  * do_utimes - change times on filename or file descriptor
  * @dfd: open file descriptor, -1 or AT_FDCWD
@@ -88,52 +139,9 @@ static int utimes_common(const struct path *path, struct timespec64 *times)
 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 | AT_EMPTY_PATH))
-		goto out;
-
-	if (filename == NULL && dfd != AT_FDCWD) {
-		struct fd f;
-
-		if (flags)
-			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;
-		if (flags & AT_EMPTY_PATH)
-			lookup_flags |= LOOKUP_EMPTY;
-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,
-- 
2.27.0


  reply	other threads:[~2020-07-15  6:54 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-15  6:54 clean up utimes and use path based utimes in initrams Christoph Hellwig
2020-07-15  6:54 ` Christoph Hellwig [this message]
2020-07-15  6:54 ` [PATCH 2/4] fs: move timespec validation into utimes_common Christoph Hellwig
2020-07-15  6:54 ` [PATCH 3/4] fs: expose utimes_common Christoph Hellwig
2020-07-15  6:54 ` [PATCH 4/4] initramfs: use vfs_utimes in do_copy Christoph Hellwig
2020-07-15 17:03 ` clean up utimes and use path based utimes in initrams Linus Torvalds

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