linux-kernel - [PATCH] vfs: Support FALLOC_FL_NO_HIDE

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Date:   Fri, 15 Jun 2018 18:51:08 +0800
From:   Sig Shen <sigshen@...ology.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     sigshen@...ology.com, Philippe Ombredanne <pombredanne@...b.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] vfs: Support FALLOC_FL_NO_HIDE_STALE flag with fallocate

FALLOC_FL_NO_HIDE_STALE flag must be set if user want to issue
a discard request for block devices. But vfs_fallocate() will
return with an error -EOPNOTSUPP indicating lack of support
if this flag is set.

fix it by allowing FALLOC_FL_NO_HIDE_STALE flag in vfs_fallocate

Fixes: 25f4c41415e5 ("block: implement (some of) fallocate for block devices")
Signed-off-by: Sig Shen <sigshen@...ology.com>
---
 include/linux/falloc.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/falloc.h b/include/linux/falloc.h
index 674d59f..770a122 100644
--- a/include/linux/falloc.h
+++ b/include/linux/falloc.h
@@ -27,6 +27,7 @@ struct space_resv {
 					 FALLOC_FL_COLLAPSE_RANGE |	\
 					 FALLOC_FL_ZERO_RANGE |		\
 					 FALLOC_FL_INSERT_RANGE |	\
+					 FALLOC_FL_NO_HIDE_STALE |	\
 					 FALLOC_FL_UNSHARE_RANGE)
 
 #endif /* _FALLOC_H_ */
-- 
2.7.4