[PATCH 1/2] backports: add replace_fops()

* [PATCH 1/2] backports: add replace_fops()
@ 2013-11-13 16:08 Hauke Mehrtens
  2013-11-13 16:08 ` [PATCH 2/2] backports: refresh on next-20131113 Hauke Mehrtens
  0 siblings, 1 reply; 2+ messages in thread
From: Hauke Mehrtens @ 2013-11-13 16:08 UTC (permalink / raw)
  To: mcgrof; +Cc: backports, Hauke Mehrtens

This is needed by drivers/media/dvb-core/dvbdev.c and was added in:
commit e84f9e57b90ca89664d733a7cef19aa7ccd832f3
Author: Al Viro <viro@zeniv.linux.org.uk>
Date:   Sun Sep 22 14:17:15 2013 -0400

    consolidate the reassignments of ->f_op in ->open() instances

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 backport/backport-include/linux/fs.h |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/backport/backport-include/linux/fs.h b/backport/backport-include/linux/fs.h
index 9de5109..9874f81 100644
--- a/backport/backport-include/linux/fs.h
+++ b/backport/backport-include/linux/fs.h
@@ -38,4 +38,18 @@ extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
 		const void __user *from, size_t count);
 #endif
 
+#ifndef replace_fops
+/*
+ * This one is to be used *ONLY* from ->open() instances.
+ * fops must be non-NULL, pinned down *and* module dependencies
+ * should be sufficient to pin the caller down as well.
+ */
+#define replace_fops(f, fops) \
+	do {	\
+		struct file *__file = (f); \
+		fops_put(__file->f_op); \
+		BUG_ON(!(__file->f_op = (fops))); \
+	} while(0)
+#endif /* replace_fops */
+
 #endif	/* _COMPAT_LINUX_FS_H */
-- 
1.7.10.4


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