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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
	Alessio Balsini <balsini@android.com>,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.9 16/49] loop: Add LOOP_SET_DIRECT_IO to compat ioctl
Date: Sun, 27 Oct 2019 22:00:54 +0100	[thread overview]
Message-ID: <20191027203131.256664465@linuxfoundation.org> (raw)
In-Reply-To: <20191027203119.468466356@linuxfoundation.org>

From: Alessio Balsini <balsini@android.com>

[ Upstream commit fdbe4eeeb1aac219b14f10c0ed31ae5d1123e9b8 ]

Enabling Direct I/O with loop devices helps reducing memory usage by
avoiding double caching.  32 bit applications running on 64 bits systems
are currently not able to request direct I/O because is missing from the
lo_compat_ioctl.

This patch fixes the compatibility issue mentioned above by exporting
LOOP_SET_DIRECT_IO as additional lo_compat_ioctl() entry.
The input argument for this ioctl is a single long converted to a 1-bit
boolean, so compatibility is preserved.

Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Alessio Balsini <balsini@android.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/block/loop.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 9f840d9fdfcb5..f236b7984b946 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1546,6 +1546,7 @@ static int lo_compat_ioctl(struct block_device *bdev, fmode_t mode,
 		arg = (unsigned long) compat_ptr(arg);
 	case LOOP_SET_FD:
 	case LOOP_CHANGE_FD:
+	case LOOP_SET_DIRECT_IO:
 		err = lo_ioctl(bdev, mode, cmd, arg);
 		break;
 	default:
-- 
2.20.1




  parent reply	other threads:[~2019-10-27 21:37 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-27 21:00 [PATCH 4.9 00/49] 4.9.198-stable review Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 01/49] scsi: ufs: skip shutdown if hba is not powered Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 02/49] scsi: megaraid: disable device when probe failed after enabled device Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 03/49] scsi: qla2xxx: Fix unbound sleep in fcport delete path Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 04/49] ARM: OMAP2+: Fix missing reset done flag for am3 and am43 Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 05/49] ARM: dts: am4372: Set memory bandwidth limit for DISPC Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 06/49] MIPS: dts: ar9331: fix interrupt-controller size Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 07/49] nl80211: fix null pointer dereference Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 08/49] mac80211: fix txq " Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 09/49] mips: Loongson: Fix the link time qualifier of serial_exit() Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 10/49] net: hisilicon: Fix usage of uninitialized variable in function mdio_sc_cfg_reg_write() Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 11/49] namespace: fix namespace.pl script to support relative paths Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 12/49] Revert "drm/radeon: Fix EEH during kexec" Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 13/49] ocfs2: fix panic due to ocfs2_wq is null Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 14/49] MIPS: Treat Loongson Extensions as ASEs Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 15/49] MIPS: elf_hwcap: Export userspace ASEs Greg Kroah-Hartman
2019-10-27 21:00 ` Greg Kroah-Hartman [this message]
2019-10-27 21:00 ` [PATCH 4.9 17/49] net: bcmgenet: Fix RGMII_MODE_EN value for GENET v1/2/3 Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 18/49] net: bcmgenet: Set phydev->dev_flags only for internal PHYs Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 19/49] sctp: change sctp_prot .no_autobind with true Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 20/49] net: avoid potential infinite loop in tc_ctl_action() Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.9 21/49] ipv4: Return -ENETUNREACH if we cant create route but saddr is valid Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 22/49] memfd: Fix locking when tagging pins Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 23/49] USB: legousbtower: fix memleak on disconnect Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 24/49] ALSA: hda/realtek - Add support for ALC711 Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 25/49] usb: udc: lpc32xx: fix bad bit shift operation Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 26/49] USB: serial: ti_usb_3410_5052: fix port-close races Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 27/49] USB: ldusb: fix memleak on disconnect Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 28/49] USB: usblp: fix use-after-free " Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 29/49] USB: ldusb: fix read info leaks Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 30/49] MIPS: tlbex: Fix build_restore_pagemask KScratch restore Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 31/49] staging: wlan-ng: fix exit return when sme->key_idx >= NUM_WEPKEYS Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 32/49] scsi: core: try to get module before removing device Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 33/49] Input: da9063 - fix capability and drop KEY_SLEEP Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 34/49] ASoC: rsnd: Reinitialize bit clock inversion flag for every format setting Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 35/49] cfg80211: wext: avoid copying malformed SSIDs Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 36/49] mac80211: Reject malformed SSID elements Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 37/49] drm/edid: Add 6 bpc quirk for SDC panel in Lenovo G50 Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 38/49] scsi: zfcp: fix reaction on bit error threshold notification Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 39/49] mm/slub: fix a deadlock in show_slab_objects() Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 40/49] xtensa: drop EXPORT_SYMBOL for outs*/ins* Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 41/49] parisc: Fix vmap memory leak in ioremap()/iounmap() Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 42/49] CIFS: avoid using MID 0xFFFF Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 43/49] btrfs: block-group: Fix a memory leak due to missing btrfs_put_block_group() Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 44/49] memstick: jmb38x_ms: Fix an error handling path in jmb38x_ms_probe() Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 45/49] cpufreq: Avoid cpufreq_suspend() deadlock on system shutdown Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 46/49] xen/netback: fix error path of xenvif_connect_data() Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 47/49] PCI: PM: Fix pci_power_up() Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 48/49] Revert "net: sit: fix memory leak in sit_init_net()" Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.9 49/49] RDMA/cxgb4: Do not dma memory off of the stack Greg Kroah-Hartman
2019-10-28  5:35 ` [PATCH 4.9 00/49] 4.9.198-stable review kernelci.org bot
2019-10-28  9:05 ` Didik Setiawan
2019-10-28 13:34 ` Guenter Roeck
2019-10-28 21:37 ` Jon Hunter
2019-10-29 15:17 ` Naresh Kamboju

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