From: Andrew Morton <akpm@linux-foundation.org>
To: akpm@linux-foundation.org, chris@chrisdown.name,
gandalf@winds.org, hughd@google.com, linux-mm@kvack.org,
mm-commits@vger.kernel.org, torvalds@linux-foundation.org
Subject: [patch 07/15] tmpfs: restore functionality of nr_inodes=0
Date: Fri, 18 Sep 2020 21:20:18 -0700 [thread overview]
Message-ID: <20200919042018.EijFHCeuD%akpm@linux-foundation.org> (raw)
In-Reply-To: <20200918211925.7e97f0ef63d92f5cfe5ccbc5@linux-foundation.org>
From: Byron Stanoszek <gandalf@winds.org>
Subject: tmpfs: restore functionality of nr_inodes=0
Commit e809d5f0b5c9 ("tmpfs: per-superblock i_ino support") made changes
to shmem_reserve_inode() in mm/shmem.c, however the original test for
(sbinfo->max_inodes) got dropped. This causes mounting tmpfs with option
nr_inodes=0 to fail:
# mount -ttmpfs -onr_inodes=0 none /ext0
mount: /ext0: mount(2) system call failed: Cannot allocate memory.
This patch restores the nr_inodes=0 functionality.
Link: https://lkml.kernel.org/r/20200902035715.16414-1-gandalf@winds.org
Fixes: e809d5f0b5c9 ("tmpfs: per-superblock i_ino support")
Signed-off-by: Byron Stanoszek <gandalf@winds.org>
Acked-by: Hugh Dickins <hughd@google.com>
Acked-by: Chris Down <chris@chrisdown.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/shmem.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
--- a/mm/shmem.c~tmpfs-restore-functionality-of-nr_inodes=0
+++ a/mm/shmem.c
@@ -279,11 +279,13 @@ static int shmem_reserve_inode(struct su
if (!(sb->s_flags & SB_KERNMOUNT)) {
spin_lock(&sbinfo->stat_lock);
- if (!sbinfo->free_inodes) {
- spin_unlock(&sbinfo->stat_lock);
- return -ENOSPC;
+ if (sbinfo->max_inodes) {
+ if (!sbinfo->free_inodes) {
+ spin_unlock(&sbinfo->stat_lock);
+ return -ENOSPC;
+ }
+ sbinfo->free_inodes--;
}
- sbinfo->free_inodes--;
if (inop) {
ino = sbinfo->next_ino++;
if (unlikely(is_zero_ino(ino)))
_
next prev parent reply other threads:[~2020-09-19 4:20 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-19 4:19 incoming Andrew Morton
2020-09-19 4:20 ` [patch 01/15] mailmap: add older email addresses for Kees Cook Andrew Morton
2020-09-19 4:20 ` [patch 02/15] ksm: reinstate memcg charge on copied pages Andrew Morton
2020-09-19 4:20 ` [patch 03/15] mm: migration of hugetlbfs page skip memcg Andrew Morton
2020-09-19 4:20 ` [patch 04/15] shmem: shmem_writepage() split unlikely i915 THP Andrew Morton
2020-09-19 4:20 ` [patch 05/15] mm: fix check_move_unevictable_pages() on THP Andrew Morton
2020-09-19 4:20 ` [patch 06/15] mlock: fix unevictable_pgs event counts " Andrew Morton
2020-09-19 4:20 ` Andrew Morton [this message]
2020-09-19 4:20 ` [patch 08/15] kprobes: fix kill kprobe which has been marked as gone Andrew Morton
2020-09-19 4:20 ` [patch 09/15] mm/thp: fix __split_huge_pmd_locked() for migration PMD Andrew Morton
2020-09-19 4:20 ` [patch 10/15] selftests/vm: fix display of page size in map_hugetlb Andrew Morton
2020-09-19 4:20 ` [patch 11/15] mm/memory_hotplug: drain per-cpu pages again during memory offline Andrew Morton
2020-09-19 4:20 ` [patch 12/15] ftrace: let ftrace_enable_sysctl take a kernel pointer buffer Andrew Morton
2020-09-19 4:20 ` [patch 13/15] stackleak: let stack_erasing_sysctl " Andrew Morton
2020-09-19 4:20 ` [patch 14/15] fs/fs-writeback.c: adjust dirtytime_interval_handler definition to match prototype Andrew Morton
2020-09-19 4:20 ` [patch 15/15] kcsan: kconfig: move to menu 'Generic Kernel Debugging Instruments' Andrew Morton
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