From: Christoph Hellwig <hch@lst.de>
Date: Mon, 23 Mar 2026 07:01:45 +0000 (+0100)
Subject: fs: pass on FTRUNCATE_* flags to do_truncate
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0924f6b80d4ac8cc0460fc73de163b562127026d;p=thirdparty%2Fkernel%2Flinux.git

fs: pass on FTRUNCATE_* flags to do_truncate

Pass the flags one level down to replace the somewhat confusing small
argument, and clean up do_truncate as a result.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20260323070205.2939118-3-hch@lst.de
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
---

diff --git a/fs/internal.h b/fs/internal.h
index 2663823e273a1..52e4c354e7a4d 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -198,7 +198,7 @@ extern struct open_how build_open_how(int flags, umode_t mode);
 extern int build_open_flags(const struct open_how *how, struct open_flags *op);
 struct file *file_close_fd_locked(struct files_struct *files, unsigned fd);
 
-int do_ftruncate(struct file *file, loff_t length, int small);
+int do_ftruncate(struct file *file, loff_t length, unsigned int flags);
 int chmod_common(const struct path *path, umode_t mode);
 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
 		int flag);
diff --git a/fs/open.c b/fs/open.c
index 412d0d6fbaa75..181c1597e73c1 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -161,23 +161,21 @@ COMPAT_SYSCALL_DEFINE2(truncate, const char __user *, path, compat_off_t, length
 }
 #endif
 
-int do_ftruncate(struct file *file, loff_t length, int small)
+int do_ftruncate(struct file *file, loff_t length, unsigned int flags)
 {
-	struct inode *inode;
-	struct dentry *dentry;
+	struct dentry *dentry = file->f_path.dentry;
+	struct inode *inode = dentry->d_inode;
 	int error;
 
-	/* explicitly opened as large or we are on 64-bit box */
-	if (file->f_flags & O_LARGEFILE)
-		small = 0;
-
-	dentry = file->f_path.dentry;
-	inode = dentry->d_inode;
 	if (!S_ISREG(inode->i_mode) || !(file->f_mode & FMODE_WRITE))
 		return -EINVAL;
 
-	/* Cannot ftruncate over 2^31 bytes without large file support */
-	if (small && length > MAX_NON_LFS)
+	/*
+	 * Cannot ftruncate over 2^31 bytes without large file support, either
+	 * through opening with O_LARGEFILE or by using ftruncate64().
+	 */
+	if (length > MAX_NON_LFS &&
+	    !(file->f_flags & O_LARGEFILE) && !(flags & FTRUNCATE_LFS))
 		return -EINVAL;
 
 	/* Check IS_APPEND on real upper inode */
@@ -205,7 +203,7 @@ int ksys_ftruncate(unsigned int fd, loff_t length, unsigned int flags)
 	if (fd_empty(f))
 		return -EBADF;
 
-	return do_ftruncate(fd_file(f), length, !(flags & FTRUNCATE_LFS));
+	return do_ftruncate(fd_file(f), length, flags);
 }
 
 SYSCALL_DEFINE2(ftruncate, unsigned int, fd, off_t, length)
diff --git a/io_uring/truncate.c b/io_uring/truncate.c
index 487baf23b44e2..c88d8bd8d20e4 100644
--- a/io_uring/truncate.c
+++ b/io_uring/truncate.c
@@ -41,7 +41,7 @@ int io_ftruncate(struct io_kiocb *req, unsigned int issue_flags)
 
 	WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
 
-	ret = do_ftruncate(req->file, ft->len, 1);
+	ret = do_ftruncate(req->file, ft->len, 0);
 
 	io_req_set_res(req, ret, 0);
 	return IOU_COMPLETE;