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Subject[PATCH] fs/super.c stuff (10/10)
diff -urN S6-pre2-alloc_super/fs/inode.c S6-pre2-current/fs/inode.c
--- S6-pre2-alloc_super/fs/inode.c Sun Jun 10 19:09:35 2001
+++ S6-pre2-current/fs/inode.c Sun Jun 10 19:26:27 2001
@@ -357,11 +357,7 @@
spin_unlock(&inode_lock);
down_read(&s->s_umount);
if (!s->s_root) {
- up_read(&s->s_umount);
- spin_lock(&sb_lock);
- if (!--s->s_count)
- kfree(s);
- spin_unlock(&sb_lock);
+ drop_super(s);
goto restart;
}
return s;
@@ -388,23 +384,13 @@
*/
if (dev) {
if ((s = get_super(dev)) != NULL) {
- down_read(&s->s_umount);
- if (s->s_root)
- sync_inodes_sb(s);
- up_read(&s->s_umount);
- spin_lock(&sb_lock);
- if (!--s->s_count)
- kfree(s);
- spin_unlock(&sb_lock);
+ sync_inodes_sb(s);
+ drop_super(s);
}
} else {
while ((s = get_super_to_sync()) != NULL) {
sync_inodes_sb(s);
- up_read(&s->s_umount);
- spin_lock(&sb_lock);
- if (!--s->s_count)
- kfree(s);
- spin_unlock(&sb_lock);
+ drop_super(s);
}
}
}
@@ -636,13 +622,14 @@

int invalidate_device(kdev_t dev, int do_sync)
{
- struct super_block *sb = get_super(dev);
+ struct super_block *sb;
int res;

if (do_sync)
fsync_dev(dev);

res = 0;
+ sb = get_super(dev);
if (sb) {
res = invalidate_inodes(sb);
drop_super(sb);
diff -urN S6-pre2-alloc_super/fs/super.c S6-pre2-current/fs/super.c
--- S6-pre2-alloc_super/fs/super.c Sun Jun 10 19:09:39 2001
+++ S6-pre2-current/fs/super.c Sun Jun 10 19:36:51 2001
@@ -647,8 +647,23 @@
spin_unlock(&sb_lock);
}

+static inline struct super_block * find_super(kdev_t dev)
+{
+ struct list_head *p;
+
+ list_for_each(p, &super_blocks) {
+ struct super_block * s = sb_entry(p);
+ if (s->s_dev == dev) {
+ s->s_count++;
+ return s;
+ }
+ }
+ return NULL;
+}
+
void drop_super(struct super_block *sb)
{
+ up_read(&sb->s_umount);
__put_super(sb);
}

@@ -681,8 +696,7 @@
if (sb) {
if (sb->s_dirt)
write_super(sb);
- up_read(&sb->s_umount);
- __put_super(sb);
+ drop_super(sb);
}
return;
}
@@ -695,8 +709,7 @@
spin_unlock(&sb_lock);
down_read(&sb->s_umount);
write_super(sb);
- up_read(&sb->s_umount);
- __put_super(sb);
+ drop_super(sb);
goto restart;
} else
sb = sb_entry(sb->s_list.next);
@@ -719,21 +732,19 @@
return NULL;
restart:
spin_lock(&sb_lock);
- s = sb_entry(super_blocks.next);
- while (s != sb_entry(&super_blocks))
- if (s->s_dev == dev) {
- /* Yes, it sucks. As soon as we get refcounting... */
- /* Almost there */
- s->s_count++;
- spin_unlock(&sb_lock);
- lock_super(s);
- unlock_super(s);
- if (s->s_dev == dev)
- return s;
- drop_super(s);
- goto restart;
- } else
- s = sb_entry(s->s_list.next);
+ s = find_super(dev);
+ if (s) {
+ spin_unlock(&sb_lock);
+ /* Yes, it sucks. As soon as we get refcounting... */
+ /* Almost there - next two lines will go away RSN */
+ lock_super(s);
+ unlock_super(s);
+ down_read(&s->s_umount);
+ if (s->s_root)
+ return s;
+ drop_super(s);
+ goto restart;
+ }
spin_unlock(&sb_lock);
return NULL;
}
@@ -905,10 +916,11 @@
spin_unlock(&sb_lock);
}
atomic_inc(&sb->s_active);
+ up_read(&sb->s_umount);
path_release(&nd);
return sb;
}
- __put_super(sb);
+ drop_super(sb);
} else {
mode_t mode = FMODE_READ; /* we always need it ;-) */
if (!(flags & MS_RDONLY))
@@ -1623,6 +1635,7 @@
/* FIXME */
fs_type = sb->s_type;
atomic_inc(&sb->s_active);
+ up_read(&sb->s_umount);
goto mount_it;
}


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