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process.c | 69 ++++++++++++++++++++++++--------------------------------------
1 files changed, 27 insertions(+), 42 deletions(-)
diff -ruNp 9500-freeze_sbs.patch-old/kernel/power/process.c 9500-freeze_sbs.patch-new/kernel/power/process.c
--- 9500-freeze_sbs.patch-old/kernel/power/process.c 2005-11-23 14:07:24.000000000 +1100
+++ 9500-freeze_sbs.patch-new/kernel/power/process.c 2005-11-23 14:07:50.000000000 +1100
@@ -65,76 +65,61 @@ DECLARE_COMPLETION(userspace_thaw);
static atomic_t nr_userspace_frozen;
static atomic_t nr_kernelspace_frozen;
-struct remounted_fs
+struct frozen_fs
{
struct super_block *sb;
- struct remounted_fs *next;
-} *remounted_fs_list;
+ struct frozen_fs *next;
+} *frozen_fs_list;
void freezer_make_fses_rw(void)
{
- int retval;
+ while (frozen_fs_list) {
+ struct frozen_fs *this;
+ char b[255];
- while (remounted_fs_list) {
- struct remounted_fs *this;
+ this = frozen_fs_list;
+ frozen_fs_list = frozen_fs_list->next;
- this = remounted_fs_list;
- remounted_fs_list = remounted_fs_list->next;
+ bdevname(this->sb->s_bdev, b);
- lock_kernel();
- retval = do_remount_sb(this->sb, 0, NULL, 2);
- unlock_kernel();
-
- if (retval) {
- printk("Failed to remount %s as writable. Sorry.\n",
- this->sb->s_id);
- }
+ printk("Thawing %s.\n", b);
+ thaw_bdev(this->sb->s_bdev, this->sb);
kfree(this);
}
}
+/*
+ * Done after userspace is frozen, so there should be no danger of
+ * fses being unmounted while we're in here.
+ */
int freezer_make_fses_ro(void)
{
- struct remounted_fs *new;
+ struct frozen_fs *new;
struct super_block *sb;
- int retval, tries;
list_for_each_entry(sb, &super_blocks, s_list) {
if (!sb->s_root || !sb->s_bdev)
continue;
- down_write(&sb->s_umount);
+ if (sb->s_frozen == SB_FREEZE_TRANS)
+ continue;
if (!(sb->s_flags & MS_RDONLY)) {
+ char b[255];
- tries = 1;
-
- new = kmalloc(sizeof(struct remounted_fs), GFP_ATOMIC);
+ new = kmalloc(sizeof(struct frozen_fs), GFP_ATOMIC);
new->sb = sb;
- new->next = remounted_fs_list;
+ new->next = frozen_fs_list;
-again:
- lock_kernel();
- retval = do_remount_sb(sb, MS_RDONLY, NULL, 2);
- unlock_kernel();
-
- if (retval && tries < 3) {
- tries++;
- goto again;
- }
-
- if (retval) {
- kfree(new);
- freezer_make_fses_rw();
- up_write(&sb->s_umount);
- return 1;
- }
+ bdevname(sb->s_bdev, b);
- remounted_fs_list = new;
- }
+ printk("Attemting to freeze %s.\n", b);
- up_write(&sb->s_umount);
+ freeze_bdev(sb->s_bdev);
+
+ frozen_fs_list = new;
+ }
}
return 0;
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