From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Mikulas Patocka <mpatocka@redhat.com>,
Mike Snitzer <snitzer@redhat.com>
Subject: [PATCH 3.18 18/23] dm bufio: drop the lock when doing GFP_NOIO allocation
Date: Tue, 10 Jul 2018 20:24:51 +0200 [thread overview]
Message-ID: <20180710182309.652294292@linuxfoundation.org> (raw)
In-Reply-To: <20180710182308.877332304@linuxfoundation.org>
3.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mikulas Patocka <mpatocka@redhat.com>
commit 41c73a49df31151f4ff868f28fe4f129f113fa2c upstream.
If the first allocation attempt using GFP_NOWAIT fails, drop the lock
and retry using GFP_NOIO allocation (lock is dropped because the
allocation can take some time).
Note that we won't do GFP_NOIO allocation when we loop for the second
time, because the lock shouldn't be dropped between __wait_for_free_buffer
and __get_unclaimed_buffer.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/md/dm-bufio.c | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -761,6 +761,7 @@ enum new_flag {
static struct dm_buffer *__alloc_buffer_wait_no_callback(struct dm_bufio_client *c, enum new_flag nf)
{
struct dm_buffer *b;
+ bool tried_noio_alloc = false;
/*
* dm-bufio is resistant to allocation failures (it just keeps
@@ -785,6 +786,15 @@ static struct dm_buffer *__alloc_buffer_
if (nf == NF_PREFETCH)
return NULL;
+ if (dm_bufio_cache_size_latch != 1 && !tried_noio_alloc) {
+ dm_bufio_unlock(c);
+ b = alloc_buffer(c, GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN);
+ dm_bufio_lock(c);
+ if (b)
+ return b;
+ tried_noio_alloc = true;
+ }
+
if (!list_empty(&c->reserved_buffers)) {
b = list_entry(c->reserved_buffers.next,
struct dm_buffer, lru_list);
next prev parent reply other threads:[~2018-07-10 18:26 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-10 18:24 [PATCH 3.18 00/23] 3.18.115-stable review Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 01/23] n_tty: Fix stall at n_tty_receive_char_special() Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 02/23] staging: android: ion: Return an ERR_PTR in ion_map_kernel Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 03/23] x86/boot: Fix early command-line parsing when matching at end Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 04/23] ubi: fastmap: Correctly handle interrupted erasures in EBA Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 05/23] netfilter: ebtables: handle string from userspace with care Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 06/23] atm: zatm: fix memcmp casting Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 07/23] net: qmi_wwan: Add Netgear Aircard 779S Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 08/23] net/sonic: Use dma_mapping_error() Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 09/23] scsi: sg: mitigate read/write abuse Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 10/23] cifs: Fix infinite loop when using hard mount option Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 11/23] ext4: make sure bitmaps and the inode table dont overlap with bg descriptors Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 12/23] ext4: clear i_data in ext4_inode_info when removing inline data Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 13/23] ext4: add more mount time checks of the superblock Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 14/23] HID: i2c-hid: Fix "incomplete report" noise Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 15/23] HID: debug: check length before copy_to_user() Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 16/23] media: cx25840: Use subdev host data for PLL override Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 17/23] dm bufio: avoid sleeping while holding the dm_bufio lock Greg Kroah-Hartman
2018-07-10 18:24 ` Greg Kroah-Hartman [this message]
2018-07-10 18:24 ` [PATCH 3.18 19/23] mtd: rawnand: mxc: set spare area size register explicitly Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 20/23] mtd: cfi_cmdset_0002: Change definition naming to retry write operation Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 21/23] mtd: cfi_cmdset_0002: Change erase functions to retry for error Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 22/23] mtd: cfi_cmdset_0002: Change erase functions to check chip good only Greg Kroah-Hartman
2018-07-10 18:24 ` [PATCH 3.18 23/23] netfilter: nf_log: dont hold nf_log_mutex during user access Greg Kroah-Hartman
2018-07-10 19:09 ` [PATCH 3.18 00/23] 3.18.115-stable review Nathan Chancellor
2018-07-10 20:19 ` Harsh 'Shandilya
2018-07-11 11:05 ` Greg Kroah-Hartman
2018-07-11 13:39 ` Guenter Roeck
2018-07-11 15:10 ` Shuah Khan
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