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buffer.c: call thaw_super during emergency thaw 

There are 2 distinct freezing mechanisms - one operates on block
devices and another one directly on super blocks. Both end up with the
same result, but thaw of only one of these does not thaw the other.

In particular fsfreeze --freeze uses the ioctl variant going to the
super block. Since prior to this patch emergency thaw was not doing
a relevant thaw, filesystems frozen with this method remained
unaffected.

The patch is a hack which adds blind unfreezing.

In order to keep the super block write-locked the whole time the code
is shuffled around and the newly introduced __iterate_supers is
employed.

Signed-off-by: Mateusz Guzik <mguzik@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Mateusz Guzik 2017-10-03 18:17:41 +02:00 committed by Al Viro
parent fa7c1d5080
commit 08fdc8a013
3 changed files with 49 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
fs/buffer.c
View File

@ -523,35 +523,12 @@ repeat:
return err;
}
static void do_thaw_one(struct super_block *sb, void *unused)
void emergency_thaw_bdev(struct super_block *sb)
{
while (sb->s_bdev && !thaw_bdev(sb->s_bdev, sb))
printk(KERN_WARNING "Emergency Thaw on %pg\n", sb->s_bdev);
}
static void do_thaw_all(struct work_struct *work)
{
iterate_supers(do_thaw_one, NULL);
kfree(work);
printk(KERN_WARNING "Emergency Thaw complete\n");
}
/**
* emergency_thaw_all -- forcibly thaw every frozen filesystem
*
* Used for emergency unfreeze of all filesystems via SysRq
*/
void emergency_thaw_all(void)
{
struct work_struct *work;
work = kmalloc(sizeof(*work), GFP_ATOMIC);
if (work) {
INIT_WORK(work, do_thaw_all);
schedule_work(work);
}
}
/**
* sync_mapping_buffers - write out & wait upon a mapping's "associated" buffers
* @mapping: the mapping which wants those buffers written

44
fs/super.c
View File

@ -36,6 +36,7 @@
#include <linux/user_namespace.h>
#include "internal.h"
static int thaw_super_locked(struct super_block *sb);
static LIST_HEAD(super_blocks);
static DEFINE_SPINLOCK(sb_lock);
@ -934,6 +935,40 @@ void emergency_remount(void)
}
}
static void do_thaw_all_callback(struct super_block *sb)
{
down_write(&sb->s_umount);
if (sb->s_root && sb->s_flags & MS_BORN) {
emergency_thaw_bdev(sb);
thaw_super_locked(sb);
} else {
up_write(&sb->s_umount);
}
}
static void do_thaw_all(struct work_struct *work)
{
__iterate_supers(do_thaw_all_callback);
kfree(work);
printk(KERN_WARNING "Emergency Thaw complete\n");
}
/**
* emergency_thaw_all -- forcibly thaw every frozen filesystem
*
* Used for emergency unfreeze of all filesystems via SysRq
*/
void emergency_thaw_all(void)
{
struct work_struct *work;
work = kmalloc(sizeof(*work), GFP_ATOMIC);
if (work) {
INIT_WORK(work, do_thaw_all);
schedule_work(work);
}
}
/*
* Unnamed block devices are dummy devices used by virtual
* filesystems which don't use real block-devices. -- jrs
@ -1503,11 +1538,10 @@ EXPORT_SYMBOL(freeze_super);
*
* Unlocks the filesystem and marks it writeable again after freeze_super().
*/
int thaw_super(struct super_block *sb)
static int thaw_super_locked(struct super_block *sb)
{
int error;
down_write(&sb->s_umount);
if (sb->s_writers.frozen != SB_FREEZE_COMPLETE) {
up_write(&sb->s_umount);
return -EINVAL;
@ -1538,4 +1572,10 @@ out:
deactivate_locked_super(sb);
return 0;
}
int thaw_super(struct super_block *sb)
{
down_write(&sb->s_umount);
return thaw_super_locked(sb);
}
EXPORT_SYMBOL(thaw_super);

6
include/linux/fs.h
View File

@ -2428,6 +2428,7 @@ extern int sync_blockdev(struct block_device *bdev);
extern void kill_bdev(struct block_device *);
extern struct super_block *freeze_bdev(struct block_device *);
extern void emergency_thaw_all(void);
extern void emergency_thaw_bdev(struct super_block *sb);
extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
extern int fsync_bdev(struct block_device *);
@ -2453,6 +2454,11 @@ static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb)
return 0;
}
static inline int emergency_thaw_bdev(struct super_block *sb)
{
return 0;
}
static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg)
{
}