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init: flush async file closing

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When unpacking the initramfs or when mounting block devices we need to
ensure that any delayed fput() finished to prevent spurious errors.
The init process can be a proper kernel thread or a user mode helper.
In the latter case PF_KTHREAD isn't set. So we need to do both
flush_delayed_work() and task_work_run().

Since we'll port block device opening and closing to regular file open
and closing we need to ensure the same as for the initramfs. So just
make that a little helper.

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Srikanth Aithal <sraithal@amd.com>
Link: https://lore.kernel.org/r/CA+G9fYttTwsbFuVq10igbSvP5xC6bf_XijM=mpUqrJV=uvUirQ@mail.gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2024-02-06 16:18:43 +01:00
parent 6613476e22
commit 386dc41cf5
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GPG Key ID: 91C61BC06578DCA2
3 changed files with 15 additions and 3 deletions
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3
init/do_mounts.c
View File

@ -208,6 +208,9 @@ retry:
goto out;
case -EACCES:
case -EINVAL:
#ifdef CONFIG_BLOCK
init_flush_fput();
#endif
continue;
}
/*

9
init/do_mounts.h
View File

@ -9,6 +9,8 @@
#include <linux/major.h>
#include <linux/root_dev.h>
#include <linux/init_syscalls.h>
#include <linux/task_work.h>
#include <linux/file.h>
void mount_root_generic(char *name, char *pretty_name, int flags);
void mount_root(char *root_device_name);
@ -41,3 +43,10 @@ static inline bool initrd_load(char *root_device_name)
}
#endif
/* Ensure that async file closing finished to prevent spurious errors. */
static inline void init_flush_fput(void)
{
flush_delayed_fput();
task_work_run();
}

6
init/initramfs.c
View File

@ -16,9 +16,10 @@
#include <linux/mm.h>
#include <linux/namei.h>
#include <linux/init_syscalls.h>
#include <linux/task_work.h>
#include <linux/umh.h>
#include "do_mounts.h"
static __initdata bool csum_present;
static __initdata u32 io_csum;
@ -736,8 +737,7 @@ done:
initrd_start = 0;
initrd_end = 0;
flush_delayed_fput();
task_work_run();
init_flush_fput();
}
static ASYNC_DOMAIN_EXCLUSIVE(initramfs_domain);