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From: Naohiro Aota <naota@elisp.net>
To: David Sterba <dsterba@suse.com>, linux-btrfs@vger.kernel.org
Cc: Chris Mason <clm@fb.com>, Josef Bacik <jbacik@fb.com>,
	linux-kernel@vger.kernel.org, Hannes Reinecke <hare@suse.com>,
	Damien Le Moal <damien.lemoal@wdc.com>,
	Bart Van Assche <bart.vanassche@wdc.com>,
	Matias Bjorling <mb@lightnvm.io>, Naohiro Aota <naota@elisp.net>
Subject: [RFC PATCH 05/17] btrfs: disable fallocate in HMZONED mode
Date: Fri, 10 Aug 2018 03:04:38 +0900	[thread overview]
Message-ID: <20180809180450.5091-6-naota@elisp.net> (raw)
In-Reply-To: <20180809180450.5091-1-naota@elisp.net>

fallocate() is implemented by reserving actual extent instead of
reservations. This can result in exposing the sequential write constraint
of host-managed zoned block devices to the application, which would break
the POSIX semantic for the fallocated file.  To avoid this, report
fallocate() as not supported when in HMZONED mode.

Signed-off-by: Naohiro Aota <naota@elisp.net>
---
 fs/btrfs/file.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 095f0bb86bb7..6f4546ccb57d 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -2993,6 +2993,10 @@ static long btrfs_fallocate(struct file *file, int mode,
 	alloc_end = round_up(offset + len, blocksize);
 	cur_offset = alloc_start;
 
+	/* Do not allow fallocate in HMZONED mode */
+	if (btrfs_fs_incompat(btrfs_sb(inode->i_sb), HMZONED))
+		return -EOPNOTSUPP;
+
 	/* Make sure we aren't being give some crap mode */
 	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
 		     FALLOC_FL_ZERO_RANGE))
-- 
2.18.0


  parent reply	other threads:[~2018-08-09 20:31 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-09 18:04 [RFC PATCH 00/17] btrfs zoned block device support Naohiro Aota
2018-08-09 18:04 ` [RFC PATCH 01/17] btrfs: introduce HMZONED feature flag Naohiro Aota
2018-08-09 18:04 ` [RFC PATCH 02/17] btrfs: Get zone information of zoned block devices Naohiro Aota
2018-08-10  7:41   ` Nikolay Borisov
2018-08-09 18:04 ` [RFC PATCH 03/17] btrfs: Check and enable HMZONED mode Naohiro Aota
2018-08-10 12:25   ` Hannes Reinecke
2018-08-10 13:15     ` Naohiro Aota
2018-08-10 13:41       ` Hannes Reinecke
2018-08-09 18:04 ` [RFC PATCH 04/17] btrfs: limit super block locations in " Naohiro Aota
2018-08-09 18:04 ` Naohiro Aota [this message]
2018-08-09 18:04 ` [RFC PATCH 06/17] btrfs: disable direct IO " Naohiro Aota
2018-08-09 18:04 ` [RFC PATCH 07/17] btrfs: disable device replace " Naohiro Aota
2018-08-09 18:04 ` [RFC PATCH 08/17] btrfs: align extent allocation to zone boundary Naohiro Aota
2018-08-09 18:04 ` [RFC PATCH 09/17] btrfs: do sequential allocation on HMZONED drives Naohiro Aota
2018-08-09 18:04 ` [RFC PATCH 10/17] btrfs: split btrfs_map_bio() Naohiro Aota
2018-08-09 18:04 ` [RFC PATCH 11/17] btrfs: introduce submit buffer Naohiro Aota
2018-08-09 18:04 ` [RFC PATCH 12/17] btrfs: expire submit buffer on timeout Naohiro Aota
2018-08-09 18:04 ` [RFC PATCH 13/17] btrfs: avoid sync IO prioritization on checksum in HMZONED mode Naohiro Aota
2018-08-09 18:04 ` [RFC PATCH 14/17] btrfs: redirty released extent buffers in sequential BGs Naohiro Aota
2018-08-09 18:04 ` [RFC PATCH 15/17] btrfs: reset zones of unused block groups Naohiro Aota
2018-08-09 18:04 ` [RFC PATCH 16/17] btrfs: wait existing extents before truncating Naohiro Aota
2018-08-09 18:04 ` [RFC PATCH 17/17] btrfs: enable to mount HMZONED incompat flag Naohiro Aota
2018-08-09 18:10 ` [RFC PATCH 01/12] btrfs-progs: build: Check zoned block device support Naohiro Aota
2018-08-09 18:10   ` [RFC PATCH 02/12] btrfs-progs: utils: Introduce queue_param Naohiro Aota
2018-08-09 18:10   ` [RFC PATCH 03/12] btrfs-progs: add new HMZONED feature flag Naohiro Aota
2018-08-09 18:10   ` [RFC PATCH 04/12] btrfs-progs: Introduce zone block device helper functions Naohiro Aota
2018-08-09 18:10   ` [RFC PATCH 05/12] btrfs-progs: load and check zone information Naohiro Aota
2018-08-09 18:10   ` [RFC PATCH 06/12] btrfs-progs: avoid writing super block to sequential zones Naohiro Aota
2018-08-09 18:11   ` [RFC PATCH 07/12] btrfs-progs: support discarding zoned device Naohiro Aota
2018-08-09 18:11   ` [RFC PATCH 08/12] btrfs-progs: volume: align chunk allocation to zones Naohiro Aota
2018-08-09 18:11   ` [RFC PATCH 09/12] btrfs-progs: mkfs: Zoned block device support Naohiro Aota
2018-08-09 18:11   ` [RFC PATCH 10/12] btrfs-progs: device-add: support HMZONED device Naohiro Aota
2018-08-09 18:11   ` [RFC PATCH 11/12] btrfs-progs: replace: disable in " Naohiro Aota
2018-08-09 18:11   ` [RFC PATCH 12/12] btrfs-progs: do sequential allocation Naohiro Aota
2018-08-10  7:04 ` [RFC PATCH 00/17] btrfs zoned block device support Hannes Reinecke
2018-08-10 14:24   ` Naohiro Aota
2018-08-10  7:26 ` Hannes Reinecke
2018-08-10  7:28 ` Qu Wenruo
2018-08-10 13:32   ` Hans van Kranenburg
2018-08-10 14:04     ` Qu Wenruo
2018-08-16  9:05   ` Naohiro Aota
2018-08-10  7:53 ` Nikolay Borisov
2018-08-10  7:55   ` Nikolay Borisov
2018-08-13 18:42 ` David Sterba
2018-08-13 19:20   ` Hannes Reinecke
2018-08-13 19:29     ` Austin S. Hemmelgarn
2018-08-14  7:41       ` Hannes Reinecke
2018-08-15 11:25         ` Austin S. Hemmelgarn
2018-08-28 10:33   ` Naohiro Aota

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