* Modified by George Anzinger to reuse immediately and to use
* find bit instructions. Also removed _irq on spinlocks.
*
+ * Modified by Nadia Derbey to make it RCU safe.
+ *
* Small id to pointer translation service.
*
* It uses a radix tree like structure as a sparse array indexed
static struct kmem_cache *idr_layer_cache;
-static struct idr_layer *alloc_layer(struct idr *idp)
+static struct idr_layer *get_from_free_list(struct idr *idp)
{
struct idr_layer *p;
unsigned long flags;
return(p);
}
+static void idr_layer_rcu_free(struct rcu_head *head)
+{
+ struct idr_layer *layer;
+
+ layer = container_of(head, struct idr_layer, rcu_head);
+ kmem_cache_free(idr_layer_cache, layer);
+}
+
+static inline void free_layer(struct idr_layer *p)
+{
+ call_rcu(&p->rcu_head, idr_layer_rcu_free);
+}
+
/* only called when idp->lock is held */
-static void __free_layer(struct idr *idp, struct idr_layer *p)
+static void __move_to_free_list(struct idr *idp, struct idr_layer *p)
{
p->ary[0] = idp->id_free;
idp->id_free = p;
idp->id_free_cnt++;
}
-static void free_layer(struct idr *idp, struct idr_layer *p)
+static void move_to_free_list(struct idr *idp, struct idr_layer *p)
{
unsigned long flags;
* Depends on the return element being zeroed.
*/
spin_lock_irqsave(&idp->lock, flags);
- __free_layer(idp, p);
+ __move_to_free_list(idp, p);
spin_unlock_irqrestore(&idp->lock, flags);
}
* @gfp_mask: memory allocation flags
*
* This function should be called prior to locking and calling the
- * following function. It preallocates enough memory to satisfy
+ * idr_get_new* functions. It preallocates enough memory to satisfy
* the worst possible allocation.
*
* If the system is REALLY out of memory this function returns 0,
{
while (idp->id_free_cnt < IDR_FREE_MAX) {
struct idr_layer *new;
- new = kmem_cache_alloc(idr_layer_cache, gfp_mask);
+ new = kmem_cache_zalloc(idr_layer_cache, gfp_mask);
if (new == NULL)
return (0);
- free_layer(idp, new);
+ move_to_free_list(idp, new);
}
return 1;
}
int n, m, sh;
struct idr_layer *p, *new;
int l, id, oid;
- long bm;
+ unsigned long bm;
id = *starting_id;
restart:
/* if already at the top layer, we need to grow */
if (!(p = pa[l])) {
*starting_id = id;
- return -2;
+ return IDR_NEED_TO_GROW;
}
/* If we need to go up one layer, continue the
id = ((id >> sh) ^ n ^ m) << sh;
}
if ((id >= MAX_ID_BIT) || (id < 0))
- return -3;
+ return IDR_NOMORE_SPACE;
if (l == 0)
break;
/*
* Create the layer below if it is missing.
*/
if (!p->ary[m]) {
- if (!(new = alloc_layer(idp)))
+ new = get_from_free_list(idp);
+ if (!new)
return -1;
- p->ary[m] = new;
+ new->layer = l-1;
+ rcu_assign_pointer(p->ary[m], new);
p->count++;
}
pa[l--] = p;
p = idp->top;
layers = idp->layers;
if (unlikely(!p)) {
- if (!(p = alloc_layer(idp)))
+ if (!(p = get_from_free_list(idp)))
return -1;
+ p->layer = 0;
layers = 1;
}
/*
*/
while ((layers < (MAX_LEVEL - 1)) && (id >= (1 << (layers*IDR_BITS)))) {
layers++;
- if (!p->count)
+ if (!p->count) {
+ /* special case: if the tree is currently empty,
+ * then we grow the tree by moving the top node
+ * upwards.
+ */
+ p->layer++;
continue;
- if (!(new = alloc_layer(idp))) {
+ }
+ if (!(new = get_from_free_list(idp))) {
/*
* The allocation failed. If we built part of
* the structure tear it down.
p = p->ary[0];
new->ary[0] = NULL;
new->bitmap = new->count = 0;
- __free_layer(idp, new);
+ __move_to_free_list(idp, new);
}
spin_unlock_irqrestore(&idp->lock, flags);
return -1;
}
new->ary[0] = p;
new->count = 1;
+ new->layer = layers-1;
if (p->bitmap == IDR_FULL)
__set_bit(0, &new->bitmap);
p = new;
}
- idp->top = p;
+ rcu_assign_pointer(idp->top, p);
idp->layers = layers;
v = sub_alloc(idp, &id, pa);
- if (v == -2)
+ if (v == IDR_NEED_TO_GROW)
goto build_up;
return(v);
}
* Successfully found an empty slot. Install the user
* pointer and mark the slot full.
*/
- pa[0]->ary[id & IDR_MASK] = (struct idr_layer *)ptr;
+ rcu_assign_pointer(pa[0]->ary[id & IDR_MASK],
+ (struct idr_layer *)ptr);
pa[0]->count++;
idr_mark_full(pa, id);
}
/**
* idr_get_new_above - allocate new idr entry above or equal to a start id
* @idp: idr handle
- * @ptr: pointer you want associated with the ide
+ * @ptr: pointer you want associated with the id
* @start_id: id to start search at
* @id: pointer to the allocated handle
*
* and go back to the idr_pre_get() call. If the idr is full, it will
* return -ENOSPC.
*
- * @id returns a value in the range 0 ... 0x7fffffff
+ * @id returns a value in the range @starting_id ... 0x7fffffff
*/
int idr_get_new_above(struct idr *idp, void *ptr, int starting_id, int *id)
{
* This is a cheap hack until the IDR code can be fixed to
* return proper error values.
*/
- if (rv < 0) {
- if (rv == -1)
- return -EAGAIN;
- else /* Will be -3 */
- return -ENOSPC;
- }
+ if (rv < 0)
+ return _idr_rc_to_errno(rv);
*id = rv;
return 0;
}
/**
* idr_get_new - allocate new idr entry
* @idp: idr handle
- * @ptr: pointer you want associated with the ide
+ * @ptr: pointer you want associated with the id
* @id: pointer to the allocated handle
*
* This is the allocate id function. It should be called with any
* This is a cheap hack until the IDR code can be fixed to
* return proper error values.
*/
- if (rv < 0) {
- if (rv == -1)
- return -EAGAIN;
- else /* Will be -3 */
- return -ENOSPC;
- }
+ if (rv < 0)
+ return _idr_rc_to_errno(rv);
*id = rv;
return 0;
}
static void idr_remove_warning(int id)
{
- printk("idr_remove called for id=%d which is not allocated.\n", id);
+ printk(KERN_WARNING
+ "idr_remove called for id=%d which is not allocated.\n", id);
dump_stack();
}
struct idr_layer *p = idp->top;
struct idr_layer **pa[MAX_LEVEL];
struct idr_layer ***paa = &pa[0];
+ struct idr_layer *to_free;
int n;
*paa = NULL;
n = id & IDR_MASK;
if (likely(p != NULL && test_bit(n, &p->bitmap))){
__clear_bit(n, &p->bitmap);
- p->ary[n] = NULL;
+ rcu_assign_pointer(p->ary[n], NULL);
+ to_free = NULL;
while(*paa && ! --((**paa)->count)){
- free_layer(idp, **paa);
+ if (to_free)
+ free_layer(to_free);
+ to_free = **paa;
**paa-- = NULL;
}
if (!*paa)
idp->layers = 0;
+ if (to_free)
+ free_layer(to_free);
} else
idr_remove_warning(id);
}
void idr_remove(struct idr *idp, int id)
{
struct idr_layer *p;
+ struct idr_layer *to_free;
/* Mask off upper bits we don't use for the search. */
id &= MAX_ID_MASK;
sub_remove(idp, (idp->layers - 1) * IDR_BITS, id);
if (idp->top && idp->top->count == 1 && (idp->layers > 1) &&
- idp->top->ary[0]) { // We can drop a layer
-
+ idp->top->ary[0]) {
+ /*
+ * Single child at leftmost slot: we can shrink the tree.
+ * This level is not needed anymore since when layers are
+ * inserted, they are inserted at the top of the existing
+ * tree.
+ */
+ to_free = idp->top;
p = idp->top->ary[0];
- idp->top->bitmap = idp->top->count = 0;
- free_layer(idp, idp->top);
- idp->top = p;
+ rcu_assign_pointer(idp->top, p);
--idp->layers;
+ to_free->bitmap = to_free->count = 0;
+ free_layer(to_free);
}
while (idp->id_free_cnt >= IDR_FREE_MAX) {
- p = alloc_layer(idp);
+ p = get_from_free_list(idp);
+ /*
+ * Note: we don't call the rcu callback here, since the only
+ * layers that fall into the freelist are those that have been
+ * preallocated.
+ */
kmem_cache_free(idr_layer_cache, p);
- return;
}
+ return;
}
EXPORT_SYMBOL(idr_remove);
/**
+ * idr_remove_all - remove all ids from the given idr tree
+ * @idp: idr handle
+ *
+ * idr_destroy() only frees up unused, cached idp_layers, but this
+ * function will remove all id mappings and leave all idp_layers
+ * unused.
+ *
+ * A typical clean-up sequence for objects stored in an idr tree, will
+ * use idr_for_each() to free all objects, if necessay, then
+ * idr_remove_all() to remove all ids, and idr_destroy() to free
+ * up the cached idr_layers.
+ */
+void idr_remove_all(struct idr *idp)
+{
+ int n, id, max;
+ struct idr_layer *p;
+ struct idr_layer *pa[MAX_LEVEL];
+ struct idr_layer **paa = &pa[0];
+
+ n = idp->layers * IDR_BITS;
+ p = idp->top;
+ rcu_assign_pointer(idp->top, NULL);
+ max = 1 << n;
+
+ id = 0;
+ while (id < max) {
+ while (n > IDR_BITS && p) {
+ n -= IDR_BITS;
+ *paa++ = p;
+ p = p->ary[(id >> n) & IDR_MASK];
+ }
+
+ id += 1 << n;
+ while (n < fls(id)) {
+ if (p)
+ free_layer(p);
+ n += IDR_BITS;
+ p = *--paa;
+ }
+ }
+ idp->layers = 0;
+}
+EXPORT_SYMBOL(idr_remove_all);
+
+/**
* idr_destroy - release all cached layers within an idr tree
* idp: idr handle
*/
void idr_destroy(struct idr *idp)
{
while (idp->id_free_cnt) {
- struct idr_layer *p = alloc_layer(idp);
+ struct idr_layer *p = get_from_free_list(idp);
kmem_cache_free(idr_layer_cache, p);
}
}
* return indicates that @id is not valid or you passed %NULL in
* idr_get_new().
*
- * The caller must serialize idr_find() vs idr_get_new() and idr_remove().
+ * This function can be called under rcu_read_lock(), given that the leaf
+ * pointers lifetimes are correctly managed.
*/
void *idr_find(struct idr *idp, int id)
{
int n;
struct idr_layer *p;
- n = idp->layers * IDR_BITS;
- p = idp->top;
+ p = rcu_dereference(idp->top);
+ if (!p)
+ return NULL;
+ n = (p->layer+1) * IDR_BITS;
/* Mask off upper bits we don't use for the search. */
id &= MAX_ID_MASK;
if (id >= (1 << n))
return NULL;
+ BUG_ON(n == 0);
while (n > 0 && p) {
n -= IDR_BITS;
- p = p->ary[(id >> n) & IDR_MASK];
+ BUG_ON(n != p->layer*IDR_BITS);
+ p = rcu_dereference(p->ary[(id >> n) & IDR_MASK]);
}
return((void *)p);
}
EXPORT_SYMBOL(idr_find);
/**
+ * idr_for_each - iterate through all stored pointers
+ * @idp: idr handle
+ * @fn: function to be called for each pointer
+ * @data: data passed back to callback function
+ *
+ * Iterate over the pointers registered with the given idr. The
+ * callback function will be called for each pointer currently
+ * registered, passing the id, the pointer and the data pointer passed
+ * to this function. It is not safe to modify the idr tree while in
+ * the callback, so functions such as idr_get_new and idr_remove are
+ * not allowed.
+ *
+ * We check the return of @fn each time. If it returns anything other
+ * than 0, we break out and return that value.
+ *
+ * The caller must serialize idr_for_each() vs idr_get_new() and idr_remove().
+ */
+int idr_for_each(struct idr *idp,
+ int (*fn)(int id, void *p, void *data), void *data)
+{
+ int n, id, max, error = 0;
+ struct idr_layer *p;
+ struct idr_layer *pa[MAX_LEVEL];
+ struct idr_layer **paa = &pa[0];
+
+ n = idp->layers * IDR_BITS;
+ p = rcu_dereference(idp->top);
+ max = 1 << n;
+
+ id = 0;
+ while (id < max) {
+ while (n > 0 && p) {
+ n -= IDR_BITS;
+ *paa++ = p;
+ p = rcu_dereference(p->ary[(id >> n) & IDR_MASK]);
+ }
+
+ if (p) {
+ error = fn(id, (void *)p, data);
+ if (error)
+ break;
+ }
+
+ id += 1 << n;
+ while (n < fls(id)) {
+ n += IDR_BITS;
+ p = *--paa;
+ }
+ }
+
+ return error;
+}
+EXPORT_SYMBOL(idr_for_each);
+
+/**
+ * idr_get_next - lookup next object of id to given id.
+ * @idp: idr handle
+ * @id: pointer to lookup key
+ *
+ * Returns pointer to registered object with id, which is next number to
+ * given id.
+ */
+
+void *idr_get_next(struct idr *idp, int *nextidp)
+{
+ struct idr_layer *p, *pa[MAX_LEVEL];
+ struct idr_layer **paa = &pa[0];
+ int id = *nextidp;
+ int n, max;
+
+ /* find first ent */
+ n = idp->layers * IDR_BITS;
+ max = 1 << n;
+ p = rcu_dereference(idp->top);
+ if (!p)
+ return NULL;
+
+ while (id < max) {
+ while (n > 0 && p) {
+ n -= IDR_BITS;
+ *paa++ = p;
+ p = rcu_dereference(p->ary[(id >> n) & IDR_MASK]);
+ }
+
+ if (p) {
+ *nextidp = id;
+ return p;
+ }
+
+ id += 1 << n;
+ while (n < fls(id)) {
+ n += IDR_BITS;
+ p = *--paa;
+ }
+ }
+ return NULL;
+}
+
+
+
+/**
* idr_replace - replace pointer for given id
* @idp: idr handle
* @ptr: pointer you want associated with the id
* A -ENOENT return indicates that @id was not found.
* A -EINVAL return indicates that @id was not within valid constraints.
*
- * The caller must serialize vs idr_find(), idr_get_new(), and idr_remove().
+ * The caller must serialize with writers.
*/
void *idr_replace(struct idr *idp, void *ptr, int id)
{
int n;
struct idr_layer *p, *old_p;
- n = idp->layers * IDR_BITS;
p = idp->top;
+ if (!p)
+ return ERR_PTR(-EINVAL);
+
+ n = (p->layer+1) * IDR_BITS;
id &= MAX_ID_MASK;
return ERR_PTR(-ENOENT);
old_p = p->ary[n];
- p->ary[n] = ptr;
+ rcu_assign_pointer(p->ary[n], ptr);
return old_p;
}
EXPORT_SYMBOL(idr_replace);
-static void idr_cache_ctor(void * idr_layer, struct kmem_cache *idr_layer_cache,
- unsigned long flags)
-{
- memset(idr_layer, 0, sizeof(struct idr_layer));
-}
-
-static int init_id_cache(void)
+void __init idr_init_cache(void)
{
- if (!idr_layer_cache)
- idr_layer_cache = kmem_cache_create("idr_layer_cache",
- sizeof(struct idr_layer), 0, 0, idr_cache_ctor, NULL);
- return 0;
+ idr_layer_cache = kmem_cache_create("idr_layer_cache",
+ sizeof(struct idr_layer), 0, SLAB_PANIC, NULL);
}
/**
*/
void idr_init(struct idr *idp)
{
- init_id_cache();
memset(idp, 0, sizeof(struct idr));
spin_lock_init(&idp->lock);
}
EXPORT_SYMBOL(idr_init);
+
+
+/*
+ * IDA - IDR based ID allocator
+ *
+ * this is id allocator without id -> pointer translation. Memory
+ * usage is much lower than full blown idr because each id only
+ * occupies a bit. ida uses a custom leaf node which contains
+ * IDA_BITMAP_BITS slots.
+ *
+ * 2007-04-25 written by Tejun Heo <htejun@gmail.com>
+ */
+
+static void free_bitmap(struct ida *ida, struct ida_bitmap *bitmap)
+{
+ unsigned long flags;
+
+ if (!ida->free_bitmap) {
+ spin_lock_irqsave(&ida->idr.lock, flags);
+ if (!ida->free_bitmap) {
+ ida->free_bitmap = bitmap;
+ bitmap = NULL;
+ }
+ spin_unlock_irqrestore(&ida->idr.lock, flags);
+ }
+
+ kfree(bitmap);
+}
+
+/**
+ * ida_pre_get - reserve resources for ida allocation
+ * @ida: ida handle
+ * @gfp_mask: memory allocation flag
+ *
+ * This function should be called prior to locking and calling the
+ * following function. It preallocates enough memory to satisfy the
+ * worst possible allocation.
+ *
+ * If the system is REALLY out of memory this function returns 0,
+ * otherwise 1.
+ */
+int ida_pre_get(struct ida *ida, gfp_t gfp_mask)
+{
+ /* allocate idr_layers */
+ if (!idr_pre_get(&ida->idr, gfp_mask))
+ return 0;
+
+ /* allocate free_bitmap */
+ if (!ida->free_bitmap) {
+ struct ida_bitmap *bitmap;
+
+ bitmap = kmalloc(sizeof(struct ida_bitmap), gfp_mask);
+ if (!bitmap)
+ return 0;
+
+ free_bitmap(ida, bitmap);
+ }
+
+ return 1;
+}
+EXPORT_SYMBOL(ida_pre_get);
+
+/**
+ * ida_get_new_above - allocate new ID above or equal to a start id
+ * @ida: ida handle
+ * @staring_id: id to start search at
+ * @p_id: pointer to the allocated handle
+ *
+ * Allocate new ID above or equal to @ida. It should be called with
+ * any required locks.
+ *
+ * If memory is required, it will return -EAGAIN, you should unlock
+ * and go back to the ida_pre_get() call. If the ida is full, it will
+ * return -ENOSPC.
+ *
+ * @p_id returns a value in the range @starting_id ... 0x7fffffff.
+ */
+int ida_get_new_above(struct ida *ida, int starting_id, int *p_id)
+{
+ struct idr_layer *pa[MAX_LEVEL];
+ struct ida_bitmap *bitmap;
+ unsigned long flags;
+ int idr_id = starting_id / IDA_BITMAP_BITS;
+ int offset = starting_id % IDA_BITMAP_BITS;
+ int t, id;
+
+ restart:
+ /* get vacant slot */
+ t = idr_get_empty_slot(&ida->idr, idr_id, pa);
+ if (t < 0)
+ return _idr_rc_to_errno(t);
+
+ if (t * IDA_BITMAP_BITS >= MAX_ID_BIT)
+ return -ENOSPC;
+
+ if (t != idr_id)
+ offset = 0;
+ idr_id = t;
+
+ /* if bitmap isn't there, create a new one */
+ bitmap = (void *)pa[0]->ary[idr_id & IDR_MASK];
+ if (!bitmap) {
+ spin_lock_irqsave(&ida->idr.lock, flags);
+ bitmap = ida->free_bitmap;
+ ida->free_bitmap = NULL;
+ spin_unlock_irqrestore(&ida->idr.lock, flags);
+
+ if (!bitmap)
+ return -EAGAIN;
+
+ memset(bitmap, 0, sizeof(struct ida_bitmap));
+ rcu_assign_pointer(pa[0]->ary[idr_id & IDR_MASK],
+ (void *)bitmap);
+ pa[0]->count++;
+ }
+
+ /* lookup for empty slot */
+ t = find_next_zero_bit(bitmap->bitmap, IDA_BITMAP_BITS, offset);
+ if (t == IDA_BITMAP_BITS) {
+ /* no empty slot after offset, continue to the next chunk */
+ idr_id++;
+ offset = 0;
+ goto restart;
+ }
+
+ id = idr_id * IDA_BITMAP_BITS + t;
+ if (id >= MAX_ID_BIT)
+ return -ENOSPC;
+
+ __set_bit(t, bitmap->bitmap);
+ if (++bitmap->nr_busy == IDA_BITMAP_BITS)
+ idr_mark_full(pa, idr_id);
+
+ *p_id = id;
+
+ /* Each leaf node can handle nearly a thousand slots and the
+ * whole idea of ida is to have small memory foot print.
+ * Throw away extra resources one by one after each successful
+ * allocation.
+ */
+ if (ida->idr.id_free_cnt || ida->free_bitmap) {
+ struct idr_layer *p = get_from_free_list(&ida->idr);
+ if (p)
+ kmem_cache_free(idr_layer_cache, p);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(ida_get_new_above);
+
+/**
+ * ida_get_new - allocate new ID
+ * @ida: idr handle
+ * @p_id: pointer to the allocated handle
+ *
+ * Allocate new ID. It should be called with any required locks.
+ *
+ * If memory is required, it will return -EAGAIN, you should unlock
+ * and go back to the idr_pre_get() call. If the idr is full, it will
+ * return -ENOSPC.
+ *
+ * @id returns a value in the range 0 ... 0x7fffffff.
+ */
+int ida_get_new(struct ida *ida, int *p_id)
+{
+ return ida_get_new_above(ida, 0, p_id);
+}
+EXPORT_SYMBOL(ida_get_new);
+
+/**
+ * ida_remove - remove the given ID
+ * @ida: ida handle
+ * @id: ID to free
+ */
+void ida_remove(struct ida *ida, int id)
+{
+ struct idr_layer *p = ida->idr.top;
+ int shift = (ida->idr.layers - 1) * IDR_BITS;
+ int idr_id = id / IDA_BITMAP_BITS;
+ int offset = id % IDA_BITMAP_BITS;
+ int n;
+ struct ida_bitmap *bitmap;
+
+ /* clear full bits while looking up the leaf idr_layer */
+ while ((shift > 0) && p) {
+ n = (idr_id >> shift) & IDR_MASK;
+ __clear_bit(n, &p->bitmap);
+ p = p->ary[n];
+ shift -= IDR_BITS;
+ }
+
+ if (p == NULL)
+ goto err;
+
+ n = idr_id & IDR_MASK;
+ __clear_bit(n, &p->bitmap);
+
+ bitmap = (void *)p->ary[n];
+ if (!test_bit(offset, bitmap->bitmap))
+ goto err;
+
+ /* update bitmap and remove it if empty */
+ __clear_bit(offset, bitmap->bitmap);
+ if (--bitmap->nr_busy == 0) {
+ __set_bit(n, &p->bitmap); /* to please idr_remove() */
+ idr_remove(&ida->idr, idr_id);
+ free_bitmap(ida, bitmap);
+ }
+
+ return;
+
+ err:
+ printk(KERN_WARNING
+ "ida_remove called for id=%d which is not allocated.\n", id);
+}
+EXPORT_SYMBOL(ida_remove);
+
+/**
+ * ida_destroy - release all cached layers within an ida tree
+ * ida: ida handle
+ */
+void ida_destroy(struct ida *ida)
+{
+ idr_destroy(&ida->idr);
+ kfree(ida->free_bitmap);
+}
+EXPORT_SYMBOL(ida_destroy);
+
+/**
+ * ida_init - initialize ida handle
+ * @ida: ida handle
+ *
+ * This function is use to set up the handle (@ida) that you will pass
+ * to the rest of the functions.
+ */
+void ida_init(struct ida *ida)
+{
+ memset(ida, 0, sizeof(struct ida));
+ idr_init(&ida->idr);
+
+}
+EXPORT_SYMBOL(ida_init);
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