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From: Goldwyn Rodrigues <rgoldwyn@suse.de>
To: linux-btrfs@vger.kernel.org
Cc: kilobyte@angband.pl, linux-fsdevel@vger.kernel.org, jack@suse.cz,
	david@fromorbit.com, willy@infradead.org, hch@lst.de,
	darrick.wong@oracle.com, dsterba@suse.cz, nborisov@suse.com,
	linux-nvdimm@lists.01.org, Goldwyn Rodrigues <rgoldwyn@suse.com>
Subject: [PATCH 12/18] btrfs: allow MAP_SYNC mmap
Date: Mon, 29 Apr 2019 12:26:43 -0500	[thread overview]
Message-ID: <20190429172649.8288-13-rgoldwyn@suse.de> (raw)
In-Reply-To: <20190429172649.8288-1-rgoldwyn@suse.de>

From: Adam Borowski <kilobyte@angband.pl>

Used by userspace to detect DAX.
[rgoldwyn@suse.com: Added CONFIG_FS_DAX around mmap_supported_flags]
Signed-off-by: Adam Borowski <kilobyte@angband.pl>
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
---
 fs/btrfs/file.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 9d5a3c99a6b9..362a9cf9dcb2 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -16,6 +16,7 @@
 #include <linux/btrfs.h>
 #include <linux/uio.h>
 #include <linux/iversion.h>
+#include <linux/mman.h>
 #include "ctree.h"
 #include "disk-io.h"
 #include "transaction.h"
@@ -3319,6 +3320,9 @@ const struct file_operations btrfs_file_operations = {
 	.splice_read	= generic_file_splice_read,
 	.write_iter	= btrfs_file_write_iter,
 	.mmap		= btrfs_file_mmap,
+#ifdef CONFIG_FS_DAX
+	.mmap_supported_flags = MAP_SYNC,
+#endif
 	.open		= btrfs_file_open,
 	.release	= btrfs_release_file,
 	.fsync		= btrfs_sync_file,
-- 
2.16.4


  parent reply	other threads:[~2019-04-29 17:27 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-29 17:26 [PATCH v4 00/18] btrfs dax support Goldwyn Rodrigues
2019-04-29 17:26 ` [PATCH 01/18] btrfs: create a mount option for dax Goldwyn Rodrigues
2019-05-21 18:02   ` Darrick J. Wong
2019-04-29 17:26 ` [PATCH 02/18] btrfs: Carve out btrfs_get_extent_map_write() out of btrfs_get_blocks_write() Goldwyn Rodrigues
2019-04-29 17:26 ` [PATCH 03/18] btrfs: basic dax read Goldwyn Rodrigues
2019-05-21 15:14   ` Darrick J. Wong
2019-05-22 21:50     ` Goldwyn Rodrigues
2019-04-29 17:26 ` [PATCH 04/18] dax: Introduce IOMAP_DAX_COW to CoW edges during writes Goldwyn Rodrigues
2019-05-21 16:51   ` Darrick J. Wong
2019-05-22 20:14     ` Goldwyn Rodrigues
2019-05-23  2:10       ` Dave Chinner
2019-05-23  9:05     ` Shiyang Ruan
2019-05-23 11:51       ` Goldwyn Rodrigues
2019-05-27  8:25         ` Shiyang Ruan
2019-05-28  9:17           ` Jan Kara
2019-05-29  2:01             ` Shiyang Ruan
2019-05-29  2:47               ` Dave Chinner
2019-05-29  4:02                 ` Shiyang Ruan
2019-05-29  4:07                   ` Darrick J. Wong
2019-05-29  4:46                     ` Dave Chinner
2019-05-29 13:46                       ` Jan Kara
2019-05-29 22:14                         ` Dave Chinner
2019-05-30 11:16                           ` Jan Kara
2019-05-30 22:59                             ` Dave Chinner
2019-04-29 17:26 ` [PATCH 05/18] btrfs: return whether extent is nocow or not Goldwyn Rodrigues
2019-04-29 17:26 ` [PATCH 06/18] btrfs: Rename __endio_write_update_ordered() to btrfs_update_ordered_extent() Goldwyn Rodrigues
2019-04-29 17:26 ` [PATCH 07/18] btrfs: add dax write support Goldwyn Rodrigues
2019-05-21 17:08   ` Darrick J. Wong
2019-04-29 17:26 ` [PATCH 08/18] dax: memcpy page in case of IOMAP_DAX_COW for mmap faults Goldwyn Rodrigues
2019-05-21 17:46   ` Darrick J. Wong
2019-05-22 19:11     ` Goldwyn Rodrigues
2019-05-23  4:02       ` Darrick J. Wong
2019-05-23 12:10     ` Jan Kara
2019-04-29 17:26 ` [PATCH 09/18] btrfs: Add dax specific address_space_operations Goldwyn Rodrigues
2019-04-29 17:26 ` [PATCH 10/18] dax: replace mmap entry in case of CoW Goldwyn Rodrigues
2019-05-21 17:35   ` Darrick J. Wong
2019-05-23 13:38   ` Jan Kara
2019-04-29 17:26 ` [PATCH 11/18] btrfs: add dax mmap support Goldwyn Rodrigues
2019-04-29 17:26 ` Goldwyn Rodrigues [this message]
2019-05-10 15:32   ` [PATCH for-goldwyn] btrfs: disallow MAP_SYNC outside of DAX mounts Adam Borowski
2019-05-10 15:41     ` Dan Williams
2019-05-10 15:59       ` Pankaj Gupta
2019-05-23 13:44   ` [PATCH 12/18] btrfs: allow MAP_SYNC mmap Jan Kara
2019-05-23 16:19     ` Adam Borowski
2019-04-29 17:26 ` [PATCH 13/18] fs: dedup file range to use a compare function Goldwyn Rodrigues
2019-05-21 18:17   ` Darrick J. Wong
2019-04-29 17:26 ` [PATCH 14/18] dax: memcpy before zeroing range Goldwyn Rodrigues
2019-05-21 17:27   ` Darrick J. Wong
2019-04-29 17:26 ` [PATCH 15/18] btrfs: handle dax page zeroing Goldwyn Rodrigues
2019-04-29 17:26 ` [PATCH 16/18] btrfs: Writeprotect mmap pages on snapshot Goldwyn Rodrigues
2019-05-23 14:04   ` Jan Kara
2019-05-23 15:27     ` Goldwyn Rodrigues
2019-05-23 19:07       ` Jan Kara
2019-05-23 21:22         ` Goldwyn Rodrigues
2019-04-29 17:26 ` [PATCH 17/18] btrfs: Disable dax-based defrag and send Goldwyn Rodrigues
2019-04-29 17:26 ` [PATCH 18/18] btrfs: trace functions for btrfs_iomap_begin/end Goldwyn Rodrigues
  -- strict thread matches above, loose matches on Subject: below --
2019-04-16 16:41 [PATCH v3 00/18] btrfs dax support Goldwyn Rodrigues
2019-04-16 16:41 ` [PATCH 12/18] btrfs: allow MAP_SYNC mmap Goldwyn Rodrigues

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