linux-kernel - [PATCH v4 2/3] pstore: add seq

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Message-Id: <1398334813-8999-3-git-send-email-shuox.liu@intel.com>
Date:	Thu, 24 Apr 2014 18:20:11 +0800
From:	Liu ShuoX <shuox.liu@...el.com>
To:	linux-kernel@...r.kernel.org
Cc:	yanmin_zhang@...ux.intel.com, Liu ShuoX <shuox.liu@...el.com>,
	Zhang Yanmin <yanmin.zhang@...el.com>,
	Anton Vorontsov <anton@...msg.org>,
	Colin Cross <ccross@...roid.com>,
	Kees Cook <keescook@...omium.org>,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH v4 2/3] pstore: add seq_ops for norm zone

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 28f47a9..b8da964 100644
--- a/include/linux/pstore_ramoops.h
+++ b/include/linux/pstore_ramoops.h
@@ -33,6 +33,7 @@ struct ramoops_zone {
 	int		item_size;
 	void (*print_record)(struct seq_file *s, void *record);
 	void *(*get_new_record)(struct persistent_ram_zone *prz);
+	const struct seq_operations *seq_ops;
 };
 
 /*
-- 
1.8.3.2

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