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Subject[PATCH] vfs: Support FALLOC_FL_NO_HIDE_STALE flag with fallocate
Date
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@synology.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
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