linux-kernel - [PATCH v2 3/7] libfs: introduce new_inode_current

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Message-Id: <20200421135741.30657-1-eesposit@redhat.com>
Date:   Tue, 21 Apr 2020 15:57:37 +0200
From:   Emanuele Giuseppe Esposito <eesposit@...hat.com>
To:     linux-fsdevel@...r.kernel.org
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Frederic Barrat <fbarrat@...ux.ibm.com>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Manoj N. Kumar" <manoj@...ux.ibm.com>,
        "Matthew R. Ochs" <mrochs@...ux.ibm.com>,
        Uma Krishnan <ukrishn@...ux.ibm.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Joel Becker <jlbec@...lplan.org>,
        Christoph Hellwig <hch@....de>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        John Johansen <john.johansen@...onical.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-scsi@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Emanuele Giuseppe Esposito <eesposit@...hat.com>
Subject: [PATCH v2 3/7] libfs: introduce new_inode_current_time

It is a common special case for new_inode to initialize the
time to the current time and the inode to get_next_ino().
Introduce a core function that does it.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@...hat.com>
---
 fs/libfs.c         | 20 ++++++++++++++++++++
 include/linux/fs.h |  1 +
 2 files changed, 21 insertions(+)

diff --git a/fs/libfs.c b/fs/libfs.c
index 54e07ae986ca..3fa0cd27ab06 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -594,6 +594,26 @@ int simple_write_end(struct file *file, struct address_space *mapping,
 }
 EXPORT_SYMBOL(simple_write_end);
 
+/**
+ * new_inode_current_time - create new inode by initializing the
+ * time to the current time and the inode to get_next_ino()
+ * @sb: pointer to super block of the file system
+ *
+ * Returns an inode pointer on success, NULL on failure.
+ */
+struct inode *new_inode_current_time(struct super_block *sb)
+{
+	struct inode *inode = new_inode(sb);
+
+	if (inode) {
+		inode->i_ino = get_next_ino();
+		inode->i_atime = inode->i_mtime =
+			inode->i_ctime = current_time(inode);
+	}
+	return inode;
+}
+EXPORT_SYMBOL(new_inode_current_time);
+
 /*
  * the inodes created here are not hashed. If you use iunique to generate
  * unique inode values later for this filesystem, then you must take care
diff --git a/include/linux/fs.h b/include/linux/fs.h
index a3691c132b3a..de2577df30ae 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3088,6 +3088,7 @@ extern void clear_inode(struct inode *);
 extern void __destroy_inode(struct inode *);
 extern struct inode *new_inode_pseudo(struct super_block *sb);
 extern struct inode *new_inode(struct super_block *sb);
+extern struct inode *new_inode_current_time(struct super_block *sb);
 extern void free_inode_nonrcu(struct inode *inode);
 extern int should_remove_suid(struct dentry *);
 extern int file_remove_privs(struct file *);
-- 
2.25.2