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Subject[PATCH] fs/super.c stuff (1/10)
diff -urN S6-pre2/fs/super.c S6-pre2-mnt_instances/fs/super.c
--- S6-pre2/fs/super.c Fri Jun 8 18:29:03 2001
+++ S6-pre2-mnt_instances/fs/super.c Sat Jun 9 19:18:31 2001
@@ -386,19 +386,20 @@
mnt->mnt_parent = mnt;

spin_lock(&dcache_lock);
- list_add(&mnt->mnt_instances, &sb->s_mounts);
list_add(&mnt->mnt_list, vfsmntlist.prev);
spin_unlock(&dcache_lock);
+ atomic_inc(&sb->s_active);
if (sb->s_type->fs_flags & FS_SINGLE)
get_filesystem(sb->s_type);
out:
return mnt;
}

-static struct vfsmount *clone_mnt(struct vfsmount *old_mnt, struct dentry *root)
+static struct vfsmount *clone_mnt(struct vfsmount *old, struct dentry *root)
{
- char *name = old_mnt->mnt_devname;
+ char *name = old->mnt_devname;
struct vfsmount *mnt = alloc_vfsmnt();
+ struct super_block *sb = old->mnt_sb;

if (!mnt)
goto out;
@@ -408,14 +409,12 @@
if (mnt->mnt_devname)
strcpy(mnt->mnt_devname, name);
}
- mnt->mnt_sb = old_mnt->mnt_sb;
+ mnt->mnt_sb = sb;
mnt->mnt_root = dget(root);
mnt->mnt_mountpoint = mnt->mnt_root;
mnt->mnt_parent = mnt;

- spin_lock(&dcache_lock);
- list_add(&mnt->mnt_instances, &old_mnt->mnt_instances);
- spin_unlock(&dcache_lock);
+ atomic_inc(&sb->s_active);
out:
return mnt;
}
@@ -487,9 +486,6 @@
struct super_block *sb = mnt->mnt_sb;

dput(mnt->mnt_root);
- spin_lock(&dcache_lock);
- list_del(&mnt->mnt_instances);
- spin_unlock(&dcache_lock);
if (mnt->mnt_devname)
kfree(mnt->mnt_devname);
kmem_cache_free(mnt_cache, mnt);
@@ -757,9 +753,9 @@
INIT_LIST_HEAD(&s->s_locked_inodes);
list_add (&s->s_list, super_blocks.prev);
INIT_LIST_HEAD(&s->s_files);
- INIT_LIST_HEAD(&s->s_mounts);
init_rwsem(&s->s_umount);
sema_init(&s->s_lock, 1);
+ atomic_set(&s->s_active, 0);
sema_init(&s->s_vfs_rename_sem,1);
sema_init(&s->s_nfsd_free_path_sem,1);
sema_init(&s->s_dquot.dqio_sem, 1);
@@ -938,12 +934,9 @@
struct file_system_type *fs = sb->s_type;
struct super_operations *sop = sb->s_op;

- spin_lock(&dcache_lock);
- if (!list_empty(&sb->s_mounts)) {
- spin_unlock(&dcache_lock);
+ atomic_dec(&sb->s_active);
+ if (atomic_read(&sb->s_active))
return;
- }
- spin_unlock(&dcache_lock);
down_write(&sb->s_umount);
lock_kernel();
sb->s_root = NULL;
@@ -1045,9 +1038,7 @@
mnt->mnt_root = dget(sb->s_root);
mnt->mnt_mountpoint = mnt->mnt_root;
mnt->mnt_parent = mnt;
- spin_lock(&dcache_lock);
- list_add(&mnt->mnt_instances, &sb->s_mounts);
- spin_unlock(&dcache_lock);
+ atomic_inc(&sb->s_active);
type->kern_mnt = mnt;
return mnt;
}
@@ -1092,7 +1083,7 @@

spin_lock(&dcache_lock);

- if (mnt->mnt_instances.next != mnt->mnt_instances.prev) {
+ if (atomic_read(&sb->s_active) > 1) {
if (atomic_read(&mnt->mnt_count) > 2) {
spin_unlock(&dcache_lock);
return -EBUSY;
@@ -1324,9 +1315,7 @@
mnt->mnt_root = dget(sb->s_root);
mnt->mnt_mountpoint = mnt->mnt_root;
mnt->mnt_parent = mnt;
- spin_lock(&dcache_lock);
- list_add(&mnt->mnt_instances, &sb->s_mounts);
- spin_unlock(&dcache_lock);
+ atomic_inc(&sb->s_active);

/* Something was mounted here while we slept */
while(d_mountpoint(nd->dentry) && follow_down(&nd->mnt, &nd->dentry))
diff -urN S6-pre2/include/linux/fs.h S6-pre2-mnt_instances/include/linux/fs.h
--- S6-pre2/include/linux/fs.h Fri Jun 8 18:29:03 2001
+++ S6-pre2-mnt_instances/include/linux/fs.h Sat Jun 9 19:18:31 2001
@@ -679,13 +679,13 @@
struct dentry *s_root;
struct rw_semaphore s_umount;
struct semaphore s_lock;
+ atomic_t s_active;

struct list_head s_dirty; /* dirty inodes */
struct list_head s_locked_inodes;/* inodes being synced */
struct list_head s_files;

struct block_device *s_bdev;
- struct list_head s_mounts; /* vfsmount(s) of this one */
struct quota_mount_options s_dquot; /* Diskquota specific options */

union {
diff -urN S6-pre2/include/linux/mount.h S6-pre2-mnt_instances/include/linux/mount.h
--- S6-pre2/include/linux/mount.h Fri Jun 8 18:29:03 2001
+++ S6-pre2-mnt_instances/include/linux/mount.h Sat Jun 9 19:18:31 2001
@@ -18,7 +18,6 @@
struct vfsmount *mnt_parent; /* fs we are mounted on */
struct dentry *mnt_mountpoint; /* dentry of mountpoint */
struct dentry *mnt_root; /* root of the mounted tree */
- struct list_head mnt_instances; /* other vfsmounts of the same fs */
struct super_block *mnt_sb; /* pointer to superblock */
struct list_head mnt_mounts; /* list of children, anchored here */
struct list_head mnt_child; /* and going through their mnt_child */

-
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