linux-kernel - [PATCH v2 2/3] pstore: add seq

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Date:	Mon, 31 Mar 2014 14:30:30 +0800
From:	Liu ShuoX <shuox.liu@...el.com>
To:	linux-kernel@...r.kernel.org
Cc:	"Luck, Tony" <tony.luck@...el.com>, linux-next@...r.kernel.org,
	Zhang Yanmin <yanmin.zhang@...el.com>, fengguang.wu@...el.com,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: [PATCH v2 2/3] pstore: add seq_ops for norm zone

From: Liu ShuoX <shuox.liu@...el.com>

Some developers want to output the pstore record trace flexible.
So add seq_ops into ramoops_zone in case users would make private output
format.

Signed-off-by: Zhang Yanmin <yanmin.zhang@...el.com>
Signed-off-by: Liu ShuoX <shuox.liu@...el.com>
---
  fs/pstore/inode.c              | 10 ++++++++--
  include/linux/pstore_ramoops.h |  1 +
  2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index d463481..a9c9782 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -207,14 +207,20 @@ static ssize_t pstore_file_read(struct file *file, char __user *userbuf,
  static int pstore_file_open(struct inode *inode, struct file *file)
  {
  	struct pstore_private *ps = inode->i_private;
+	struct ramoops_context *cxt = ps->psi->data;
+	struct ramoops_zone    *zones = cxt ? cxt->zones : NULL;
  	struct seq_file *sf;
  	int err;
  	const struct seq_operations *sops = NULL;
  
  	if (ps->type == PSTORE_TYPE_FTRACE)
  		sops = &pstore_ftrace_seq_ops;
-	if (ps->type == PSTORE_TYPE_NORM)
-		sops = &pstore_seq_ops;
+	if (ps->type == PSTORE_TYPE_NORM && zones) {
+		if (zones[ps->id].seq_ops)
+			sops = zones[ps->id].seq_ops;
+		else
+			sops = &pstore_seq_ops;
+	}
  
  	err = seq_open(file, sops);
  	if (err < 0)
diff --git a/include/linux/pstore_ramoops.h b/include/linux/pstore_ramoops.h
index 7c0a64b..9a5a224 100644
--- a/include/linux/pstore_ramoops.h
+++ b/include/linux/pstore_ramoops.h
@@ -32,6 +32,7 @@ struct ramoops_zone {
  	struct persistent_ram_zone *prz;
  	int		item_size;
  	void (*print_record)(struct seq_file *s, void *record);
+	struct seq_operations *seq_ops;
  };
  
  /*
-- 
1.8.3.2

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