From: John Groves <John@groves.net>
To: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: John Groves <jgroves@micron.com>,
Jonathan Corbet <corbet@lwn.net>,
Dan Williams <dan.j.williams@intel.com>,
Vishal Verma <vishal.l.verma@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
Matthew Wilcox <willy@infradead.org>,
linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
nvdimm@lists.linux.dev, john@jagalactic.com,
Dave Chinner <david@fromorbit.com>,
Christoph Hellwig <hch@infradead.org>,
dave.hansen@linux.intel.com, gregory.price@memverge.com
Subject: Re: [RFC PATCH 12/20] famfs: Add inode_operations and file_system_type
Date: Mon, 26 Feb 2024 16:53:33 -0600 [thread overview]
Message-ID: <y2ps2uhwp46x73hnlqz6hjik34kmw7qc2gkzyfcccfnp2f23em@254i2r3wm4eh> (raw)
In-Reply-To: <20240226132538.00002656@Huawei.com>
On 24/02/26 01:25PM, Jonathan Cameron wrote:
> On Fri, 23 Feb 2024 11:41:56 -0600
> John Groves <John@Groves.net> wrote:
>
> > This commit introduces the famfs inode_operations. There is nothing really
> > unique to famfs here in the inode_operations..
> >
> > This commit also introduces the famfs_file_system_type struct and the
> > famfs_kill_sb() function.
> >
> > Signed-off-by: John Groves <john@groves.net>
>
> Trivial comments only.
>
> > +
> > +/*
> > + * File creation. Allocate an inode, and we're done..
> > + */
> > +/* SMP-safe */
> > +static int
> > +famfs_mknod(
> > + struct mnt_idmap *idmap,
> > + struct inode *dir,
> > + struct dentry *dentry,
> > + umode_t mode,
> > + dev_t dev)
> > +{
> > + struct inode *inode = famfs_get_inode(dir->i_sb, dir, mode, dev);
> > + int error = -ENOSPC;
> > +
> > + if (inode) {
>
> As below. I would flip it for cleaner code/ shorter indent etc.
Nice - done.
>
> > + struct timespec64 tv;
> > +
> > + d_instantiate(dentry, inode);
> > + dget(dentry); /* Extra count - pin the dentry in core */
> > + error = 0;
> > + tv = inode_set_ctime_current(inode);
> > + inode_set_mtime_to_ts(inode, tv);
> > + inode_set_atime_to_ts(inode, tv);
> > + }
> > + return error;
> > +}
> > +
> > +static int famfs_mkdir(
> > + struct mnt_idmap *idmap,
> > + struct inode *dir,
> > + struct dentry *dentry,
> > + umode_t mode)
> > +{
> > + int retval = famfs_mknod(&nop_mnt_idmap, dir, dentry, mode | S_IFDIR, 0);
> > +
> > + if (!retval)
> > + inc_nlink(dir);
>
> Copy local style, so fine if this is common pattern, otherwise I'd go for
> consistent error cases out of line as easier for us sleepy caffeine
> deprived reviewers.
>
>
> if (retval)
> return retval;
>
> inc_nlink(dir);
>
> return 0;
Agree, done.
> > +
> > + return retval;
> > +}
> > +
> > +static int famfs_create(
> > + struct mnt_idmap *idmap,
> > + struct inode *dir,
> > + struct dentry *dentry,
> > + umode_t mode,
> > + bool excl)
> > +{
> > + return famfs_mknod(&nop_mnt_idmap, dir, dentry, mode | S_IFREG, 0);
> > +}
> > +
> > +static int famfs_symlink(
> > + struct mnt_idmap *idmap,
> > + struct inode *dir,
> > + struct dentry *dentry,
> > + const char *symname)
> > +{
> > + struct inode *inode;
> > + int error = -ENOSPC;
> > +
> > + inode = famfs_get_inode(dir->i_sb, dir, S_IFLNK | 0777, 0);
> if (!inode)
> return -ENOSPC;
>
> > + if (inode) {
> > + int l = strlen(symname)+1;
> > +
> > + error = page_symlink(inode, symname, l);
> if (error) {
> iput(inode);
> return error;
> }
>
> ...
>
Right, I like it. This was some tortured conditioning, which came from
somewhere. I deny responsibility :D
Thanks,
John
next prev parent reply other threads:[~2024-02-26 22:53 UTC|newest]
Thread overview: 102+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-23 17:41 [RFC PATCH 00/20] Introduce the famfs shared-memory file system John Groves
2024-02-23 17:41 ` [RFC PATCH 01/20] famfs: Documentation John Groves
2024-02-23 17:41 ` [RFC PATCH 02/20] dev_dax_iomap: Add fs_dax_get() func to prepare dax for fs-dax usage John Groves
2024-02-26 12:05 ` Jonathan Cameron
2024-02-26 15:00 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 03/20] dev_dax_iomap: Move dax_pgoff_to_phys from device.c to bus.c since both need it now John Groves
2024-02-26 12:10 ` Jonathan Cameron
2024-02-26 15:13 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 04/20] dev_dax_iomap: Save the kva from memremap John Groves
2024-02-26 12:21 ` Jonathan Cameron
2024-02-26 15:48 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 05/20] dev_dax_iomap: Add dax_operations for use by fs-dax on devdax John Groves
2024-02-26 12:32 ` Jonathan Cameron
2024-02-26 16:09 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 06/20] dev_dax_iomap: Add CONFIG_DEV_DAX_IOMAP kernel build parameter John Groves
2024-02-26 12:34 ` Jonathan Cameron
2024-02-26 16:12 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 07/20] famfs: Add include/linux/famfs_ioctl.h John Groves
2024-02-24 1:39 ` Randy Dunlap
2024-02-24 2:23 ` John Groves
2024-02-24 3:27 ` Randy Dunlap
2024-02-24 23:32 ` John Groves
2024-02-24 23:40 ` Randy Dunlap
2024-02-26 12:39 ` Jonathan Cameron
2024-02-26 16:44 ` John Groves
2024-02-26 16:56 ` Jonathan Cameron
2024-02-26 18:04 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 08/20] famfs: Add famfs_internal.h John Groves
2024-02-26 12:48 ` Jonathan Cameron
2024-02-26 17:35 ` John Groves
2024-02-27 10:28 ` Jonathan Cameron
2024-02-28 1:06 ` John Groves
2024-02-27 13:38 ` Christian Brauner
2024-02-27 14:12 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 09/20] famfs: Add super_operations John Groves
2024-02-26 12:51 ` Jonathan Cameron
2024-02-26 21:47 ` John Groves
2024-02-27 10:34 ` Jonathan Cameron
2024-02-27 17:48 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 10/20] famfs: famfs_open_device() & dax_holder_operations John Groves
2024-02-26 12:56 ` Jonathan Cameron
2024-02-26 22:22 ` John Groves
2024-02-27 13:39 ` Christian Brauner
2024-02-27 18:38 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 11/20] famfs: Add fs_context_operations John Groves
2024-02-26 13:20 ` Jonathan Cameron
2024-02-26 22:43 ` John Groves
2024-02-27 13:41 ` Christian Brauner
2024-02-28 0:59 ` John Groves
2024-02-28 1:49 ` Randy Dunlap
2024-02-28 8:17 ` Christian Brauner
2024-02-28 10:07 ` Christian Brauner
2024-02-28 12:01 ` Christian Brauner
2024-02-23 17:41 ` [RFC PATCH 12/20] famfs: Add inode_operations and file_system_type John Groves
2024-02-26 13:25 ` Jonathan Cameron
2024-02-26 22:53 ` John Groves [this message]
2024-02-23 17:41 ` [RFC PATCH 13/20] famfs: Add iomap_ops John Groves
2024-02-26 13:30 ` Jonathan Cameron
2024-02-26 23:00 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 14/20] famfs: Add struct file_operations John Groves
2024-02-26 13:32 ` Jonathan Cameron
2024-02-26 23:09 ` John Groves
2024-02-23 17:41 ` [RFC PATCH 15/20] famfs: Add ioctl to file_operations John Groves
2024-02-26 13:44 ` Jonathan Cameron
2024-02-23 17:42 ` [RFC PATCH 16/20] famfs: Add fault counters John Groves
2024-02-23 18:23 ` Dave Hansen
2024-02-23 19:56 ` John Groves
2024-02-23 20:04 ` Dan Williams
2024-02-23 20:39 ` John Groves
2024-02-23 21:19 ` Dave Hansen
2024-02-23 23:50 ` Dan Williams
2024-02-24 3:59 ` Matthew Wilcox
2024-02-24 4:30 ` Dan Williams
2024-02-23 17:42 ` [RFC PATCH 17/20] famfs: Add module stuff John Groves
2024-02-26 13:47 ` Jonathan Cameron
2024-02-27 22:15 ` John Groves
2024-02-23 17:42 ` [RFC PATCH 18/20] famfs: Support character dax via the dev_dax_iomap patch John Groves
2024-02-26 13:52 ` Jonathan Cameron
2024-02-27 22:27 ` John Groves
2024-02-23 17:42 ` [RFC PATCH 19/20] famfs: Update MAINTAINERS file John Groves
2024-02-23 17:42 ` [RFC PATCH 20/20] famfs: Add Kconfig and Makefile plumbing John Groves
2024-02-24 1:50 ` Randy Dunlap
2024-02-24 2:24 ` John Groves
2024-02-24 0:07 ` [RFC PATCH 00/20] Introduce the famfs shared-memory file system Luis Chamberlain
2024-02-26 13:27 ` John Groves
2024-02-26 15:53 ` Luis Chamberlain
2024-02-26 21:16 ` John Groves
2024-02-27 0:58 ` Luis Chamberlain
2024-02-27 2:05 ` John Groves
2024-02-29 2:15 ` Dave Chinner
2024-02-29 14:52 ` John Groves
2024-03-11 1:29 ` Dave Chinner
2024-02-29 6:52 ` Amir Goldstein
2024-02-29 22:16 ` John Groves
2024-05-17 9:55 ` Miklos Szeredi
2024-05-19 5:59 ` Amir Goldstein
2024-05-22 2:05 ` John Groves
2024-05-22 8:58 ` Miklos Szeredi
2024-05-22 10:16 ` Amir Goldstein
2024-05-22 11:28 ` Miklos Szeredi
2024-05-22 13:41 ` Amir Goldstein
2024-05-23 2:49 ` John Groves
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