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From: "Darrick J. Wong" <djwong@kernel.org>
To: xfs <linux-xfs@vger.kernel.org>
Cc: Dave Chinner <david@fromorbit.com>
Subject: [PATCH] xfs: restore speculative_cow_prealloc_lifetime sysctl
Date: Fri, 12 Feb 2021 09:24:36 -0800
Message-ID: <20210212172436.GK7193@magnolia> (raw)

From: Darrick J. Wong <djwong@kernel.org>

In commit 9669f51de5c0 I tried to get rid of the undocumented cow gc
lifetime knob.  The knob's function was never documented and it now
doesn't really have a function since eof and cow gc have been
consolidated.

Regrettably, xfs/231 relies on it and regresses on for-next.  I did not
succeed at getting far enough through fstests patch review for the fixup
to land in time.

Restore the sysctl knob, document what it did (does?), put it on the
deprecation schedule, and rip out a redundant function.

Fixes: 9669f51de5c0 ("xfs: consolidate the eofblocks and cowblocks workers")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 Documentation/admin-guide/xfs.rst |    4 ++++
 fs/xfs/xfs_sysctl.c               |   33 +++++++++++++--------------------
 2 files changed, 17 insertions(+), 20 deletions(-)

diff --git a/Documentation/admin-guide/xfs.rst b/Documentation/admin-guide/xfs.rst
index 6178153d3320..e188d0ea7b5b 100644
--- a/Documentation/admin-guide/xfs.rst
+++ b/Documentation/admin-guide/xfs.rst
@@ -284,6 +284,9 @@ The following sysctls are available for the XFS filesystem:
 	removes unused preallocation from clean inodes and releases
 	the unused space back to the free pool.
 
+  fs.xfs.speculative_cow_prealloc_lifetime
+	This is an alias for speculative_prealloc_lifetime.
+
   fs.xfs.error_level		(Min: 0  Default: 3  Max: 11)
 	A volume knob for error reporting when internal errors occur.
 	This will generate detailed messages & backtraces for filesystem
@@ -361,6 +364,7 @@ Deprecated Sysctls
 ===========================     ================
 fs.xfs.irix_sgid_inherit        September 2025
 fs.xfs.irix_symlink_mode        September 2025
+fs.xfs.speculative_cow_prealloc_lifetime   September 2025
 ===========================     ================
 
 
diff --git a/fs/xfs/xfs_sysctl.c b/fs/xfs/xfs_sysctl.c
index 145e06c47744..75a3c7f0db8e 100644
--- a/fs/xfs/xfs_sysctl.c
+++ b/fs/xfs/xfs_sysctl.c
@@ -51,7 +51,7 @@ xfs_panic_mask_proc_handler(
 #endif /* CONFIG_PROC_FS */
 
 STATIC int
-xfs_deprecate_irix_sgid_inherit_proc_handler(
+xfs_deprecated_dointvec_minmax(
 	struct ctl_table	*ctl,
 	int			write,
 	void			*buffer,
@@ -60,23 +60,7 @@ xfs_deprecate_irix_sgid_inherit_proc_handler(
 {
 	if (write) {
 		printk_once(KERN_WARNING
-				"XFS: " "%s sysctl option is deprecated.\n",
-				ctl->procname);
-	}
-	return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
-}
-
-STATIC int
-xfs_deprecate_irix_symlink_mode_proc_handler(
-	struct ctl_table	*ctl,
-	int			write,
-	void			*buffer,
-	size_t			*lenp,
-	loff_t			*ppos)
-{
-	if (write) {
-		printk_once(KERN_WARNING
-				"XFS: " "%s sysctl option is deprecated.\n",
+				"XFS: %s sysctl option is deprecated.\n",
 				ctl->procname);
 	}
 	return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
@@ -88,7 +72,7 @@ static struct ctl_table xfs_table[] = {
 		.data		= &xfs_params.sgid_inherit.val,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
-		.proc_handler	= xfs_deprecate_irix_sgid_inherit_proc_handler,
+		.proc_handler	= xfs_deprecated_dointvec_minmax,
 		.extra1		= &xfs_params.sgid_inherit.min,
 		.extra2		= &xfs_params.sgid_inherit.max
 	},
@@ -97,7 +81,7 @@ static struct ctl_table xfs_table[] = {
 		.data		= &xfs_params.symlink_mode.val,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
-		.proc_handler	= xfs_deprecate_irix_symlink_mode_proc_handler,
+		.proc_handler	= xfs_deprecated_dointvec_minmax,
 		.extra1		= &xfs_params.symlink_mode.min,
 		.extra2		= &xfs_params.symlink_mode.max
 	},
@@ -201,6 +185,15 @@ static struct ctl_table xfs_table[] = {
 		.extra1		= &xfs_params.blockgc_timer.min,
 		.extra2		= &xfs_params.blockgc_timer.max,
 	},
+	{
+		.procname	= "speculative_cow_prealloc_lifetime",
+		.data		= &xfs_params.blockgc_timer.val,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= xfs_deprecated_dointvec_minmax,
+		.extra1		= &xfs_params.blockgc_timer.min,
+		.extra2		= &xfs_params.blockgc_timer.max,
+	},
 	/* please keep this the last entry */
 #ifdef CONFIG_PROC_FS
 	{

             reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-12 17:24 Darrick J. Wong [this message]
2021-02-12 21:21 ` Dave Chinner
2021-02-12 21:28   ` Darrick J. Wong
2021-02-12 21:48 ` [PATCH v2] " Darrick J. Wong
2021-02-12 22:46   ` Dave Chinner
2021-02-25  7:37   ` Christoph Hellwig

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