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linux/lib/test_xarray.c

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xarray: Add XArray load operation The xa_load function brings with it a lot of infrastructure; xa_empty(), xa_is_err(), and large chunks of the XArray advanced API that are used to implement xa_load. As the test-suite demonstrates, it is possible to use the XArray functions on a radix tree. The radix tree functions depend on the GFP flags being stored in the root of the tree, so it's not possible to use the radix tree functions on an XArray. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-07 19:57:46 +00:00
// SPDX-License-Identifier: GPL-2.0+
/*
* test_xarray.c: Test the XArray API
* Copyright (c) 2017-2018 Microsoft Corporation
* Author: Matthew Wilcox <willy@infradead.org>
*/
#include <linux/xarray.h>
#include <linux/module.h>
static unsigned int tests_run;
static unsigned int tests_passed;
#ifndef XA_DEBUG
# ifdef __KERNEL__
void xa_dump(const struct xarray *xa) { }
# endif
#undef XA_BUG_ON
#define XA_BUG_ON(xa, x) do { \
tests_run++; \
if (x) { \
printk("BUG at %s:%d\n", __func__, __LINE__); \
xa_dump(xa); \
dump_stack(); \
} else { \
tests_passed++; \
} \
} while (0)
#endif
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
static void *xa_mk_index(unsigned long index)
{
return xa_mk_value(index & LONG_MAX);
}
xarray: Add XArray load operation The xa_load function brings with it a lot of infrastructure; xa_empty(), xa_is_err(), and large chunks of the XArray advanced API that are used to implement xa_load. As the test-suite demonstrates, it is possible to use the XArray functions on a radix tree. The radix tree functions depend on the GFP flags being stored in the root of the tree, so it's not possible to use the radix tree functions on an XArray. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-07 19:57:46 +00:00
static void *xa_store_index(struct xarray *xa, unsigned long index, gfp_t gfp)
{
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
return xa_store(xa, index, xa_mk_index(index), gfp);
xarray: Add XArray load operation The xa_load function brings with it a lot of infrastructure; xa_empty(), xa_is_err(), and large chunks of the XArray advanced API that are used to implement xa_load. As the test-suite demonstrates, it is possible to use the XArray functions on a radix tree. The radix tree functions depend on the GFP flags being stored in the root of the tree, so it's not possible to use the radix tree functions on an XArray. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-07 19:57:46 +00:00
}
xarray: Track free entries in an XArray Add the optional ability to track which entries in an XArray are free and provide xa_alloc() to replace most of the functionality of the IDR. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-07-04 14:50:12 +00:00
static void xa_alloc_index(struct xarray *xa, unsigned long index, gfp_t gfp)
{
u32 id = 0;
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, xa_alloc(xa, &id, UINT_MAX, xa_mk_index(index),
xarray: Track free entries in an XArray Add the optional ability to track which entries in an XArray are free and provide xa_alloc() to replace most of the functionality of the IDR. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-07-04 14:50:12 +00:00
gfp) != 0);
XA_BUG_ON(xa, id != index);
}
xarray: Add XArray load operation The xa_load function brings with it a lot of infrastructure; xa_empty(), xa_is_err(), and large chunks of the XArray advanced API that are used to implement xa_load. As the test-suite demonstrates, it is possible to use the XArray functions on a radix tree. The radix tree functions depend on the GFP flags being stored in the root of the tree, so it's not possible to use the radix tree functions on an XArray. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-07 19:57:46 +00:00
static void xa_erase_index(struct xarray *xa, unsigned long index)
{
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, xa_erase(xa, index) != xa_mk_index(index));
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
XA_BUG_ON(xa, xa_load(xa, index) != NULL);
}
/*
* If anyone needs this, please move it to xarray.c. We have no current
* users outside the test suite because all current multislot users want
* to use the advanced API.
*/
static void *xa_store_order(struct xarray *xa, unsigned long index,
unsigned order, void *entry, gfp_t gfp)
{
XA_STATE_ORDER(xas, xa, index, order);
void *curr;
do {
xas_lock(&xas);
curr = xas_store(&xas, entry);
xas_unlock(&xas);
} while (xas_nomem(&xas, gfp));
return curr;
}
static noinline void check_xa_err(struct xarray *xa)
{
XA_BUG_ON(xa, xa_err(xa_store_index(xa, 0, GFP_NOWAIT)) != 0);
XA_BUG_ON(xa, xa_err(xa_erase(xa, 0)) != 0);
#ifndef __KERNEL__
/* The kernel does not fail GFP_NOWAIT allocations */
XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_NOWAIT)) != -ENOMEM);
XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_NOWAIT)) != -ENOMEM);
#endif
XA_BUG_ON(xa, xa_err(xa_store_index(xa, 1, GFP_KERNEL)) != 0);
XA_BUG_ON(xa, xa_err(xa_store(xa, 1, xa_mk_value(0), GFP_KERNEL)) != 0);
XA_BUG_ON(xa, xa_err(xa_erase(xa, 1)) != 0);
// kills the test-suite :-(
// XA_BUG_ON(xa, xa_err(xa_store(xa, 0, xa_mk_internal(0), 0)) != -EINVAL);
xarray: Add XArray load operation The xa_load function brings with it a lot of infrastructure; xa_empty(), xa_is_err(), and large chunks of the XArray advanced API that are used to implement xa_load. As the test-suite demonstrates, it is possible to use the XArray functions on a radix tree. The radix tree functions depend on the GFP flags being stored in the root of the tree, so it's not possible to use the radix tree functions on an XArray. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-07 19:57:46 +00:00
}
xarray: Add XArray iterators The xa_for_each iterator allows the user to efficiently walk a range of the array, executing the loop body once for each entry in that range that matches the filter. This commit also includes xa_find() and xa_find_after() which are helper functions for xa_for_each() but may also be useful in their own right. In the xas family of functions, we have xas_for_each(), xas_find(), xas_next_entry(), xas_for_each_tagged(), xas_find_tagged(), xas_next_tagged() and xas_pause(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-14 13:30:11 +00:00
static noinline void check_xas_retry(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
void *entry;
xa_store_index(xa, 0, GFP_KERNEL);
xa_store_index(xa, 1, GFP_KERNEL);
rcu_read_lock();
XA_BUG_ON(xa, xas_find(&xas, ULONG_MAX) != xa_mk_value(0));
xa_erase_index(xa, 1);
XA_BUG_ON(xa, !xa_is_retry(xas_reload(&xas)));
XA_BUG_ON(xa, xas_retry(&xas, NULL));
XA_BUG_ON(xa, xas_retry(&xas, xa_mk_value(0)));
xas_reset(&xas);
XA_BUG_ON(xa, xas.xa_node != XAS_RESTART);
XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));
XA_BUG_ON(xa, xas.xa_node != NULL);
XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, !xa_is_internal(xas_reload(&xas)));
xas.xa_node = XAS_RESTART;
XA_BUG_ON(xa, xas_next_entry(&xas, ULONG_MAX) != xa_mk_value(0));
rcu_read_unlock();
/* Make sure we can iterate through retry entries */
xas_lock(&xas);
xas_set(&xas, 0);
xas_store(&xas, XA_RETRY_ENTRY);
xas_set(&xas, 1);
xas_store(&xas, XA_RETRY_ENTRY);
xas_set(&xas, 0);
xas_for_each(&xas, entry, ULONG_MAX) {
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
xas_store(&xas, xa_mk_index(xas.xa_index));
xarray: Add XArray iterators The xa_for_each iterator allows the user to efficiently walk a range of the array, executing the loop body once for each entry in that range that matches the filter. This commit also includes xa_find() and xa_find_after() which are helper functions for xa_for_each() but may also be useful in their own right. In the xas family of functions, we have xas_for_each(), xas_find(), xas_next_entry(), xas_for_each_tagged(), xas_find_tagged(), xas_next_tagged() and xas_pause(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-14 13:30:11 +00:00
}
xas_unlock(&xas);
xa_erase_index(xa, 0);
xa_erase_index(xa, 1);
}
xarray: Add XArray load operation The xa_load function brings with it a lot of infrastructure; xa_empty(), xa_is_err(), and large chunks of the XArray advanced API that are used to implement xa_load. As the test-suite demonstrates, it is possible to use the XArray functions on a radix tree. The radix tree functions depend on the GFP flags being stored in the root of the tree, so it's not possible to use the radix tree functions on an XArray. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-07 19:57:46 +00:00
static noinline void check_xa_load(struct xarray *xa)
{
unsigned long i, j;
for (i = 0; i < 1024; i++) {
for (j = 0; j < 1024; j++) {
void *entry = xa_load(xa, j);
if (j < i)
XA_BUG_ON(xa, xa_to_value(entry) != j);
else
XA_BUG_ON(xa, entry);
}
XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
}
for (i = 0; i < 1024; i++) {
for (j = 0; j < 1024; j++) {
void *entry = xa_load(xa, j);
if (j >= i)
XA_BUG_ON(xa, xa_to_value(entry) != j);
else
XA_BUG_ON(xa, entry);
}
xa_erase_index(xa, i);
}
XA_BUG_ON(xa, !xa_empty(xa));
}
xarray: Add XArray marks XArray marks are like the radix tree tags, only slightly more strongly typed. They are renamed in order to distinguish them from tagged pointers. This commit adds the basic get/set/clear operations. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 14:34:31 +00:00
static noinline void check_xa_mark_1(struct xarray *xa, unsigned long index)
{
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
unsigned int order;
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 8 : 1;
xarray: Add XArray marks XArray marks are like the radix tree tags, only slightly more strongly typed. They are renamed in order to distinguish them from tagged pointers. This commit adds the basic get/set/clear operations. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 14:34:31 +00:00
/* NULL elements have no marks set */
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
xa_set_mark(xa, index, XA_MARK_0);
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
/* Storing a pointer will not make a mark appear */
XA_BUG_ON(xa, xa_store_index(xa, index, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
xa_set_mark(xa, index, XA_MARK_0);
XA_BUG_ON(xa, !xa_get_mark(xa, index, XA_MARK_0));
/* Setting one mark will not set another mark */
XA_BUG_ON(xa, xa_get_mark(xa, index + 1, XA_MARK_0));
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_1));
/* Storing NULL clears marks, and they can't be set again */
xa_erase_index(xa, index);
XA_BUG_ON(xa, !xa_empty(xa));
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
xa_set_mark(xa, index, XA_MARK_0);
XA_BUG_ON(xa, xa_get_mark(xa, index, XA_MARK_0));
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
/*
* Storing a multi-index entry over entries with marks gives the
* entire entry the union of the marks
*/
BUG_ON((index % 4) != 0);
for (order = 2; order < max_order; order++) {
unsigned long base = round_down(index, 1UL << order);
unsigned long next = base + (1UL << order);
unsigned long i;
XA_BUG_ON(xa, xa_store_index(xa, index + 1, GFP_KERNEL));
xa_set_mark(xa, index + 1, XA_MARK_0);
XA_BUG_ON(xa, xa_store_index(xa, index + 2, GFP_KERNEL));
XArray tests: Check mark 2 gets squashed We do not currently check that the loop in xas_squash_marks() doesn't have an off-by-one error in it. It didn't, but a patch which introduced an off-by-one error wasn't caught by any existing test. Switch the roles of XA_MARK_1 and XA_MARK_2 to catch that bug. Reported-by: Cyrill Gorcunov <gorcunov@gmail.com> Signed-off-by: Matthew Wilcox <willy@infradead.org>
2019-01-14 18:57:31 +00:00
xa_set_mark(xa, index + 2, XA_MARK_2);
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
XA_BUG_ON(xa, xa_store_index(xa, next, GFP_KERNEL));
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
xa_store_order(xa, index, order, xa_mk_index(index),
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
GFP_KERNEL);
for (i = base; i < next; i++) {
xarray: Move multiorder_shrink to kernel tests Test this functionality inside the kernel as well as in userspace. Also remove insert_bug() as there's no comparable thing to test in the XArray code. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-09-08 16:09:52 +00:00
XA_STATE(xas, xa, i);
unsigned int seen = 0;
void *entry;
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_0));
XArray tests: Check mark 2 gets squashed We do not currently check that the loop in xas_squash_marks() doesn't have an off-by-one error in it. It didn't, but a patch which introduced an off-by-one error wasn't caught by any existing test. Switch the roles of XA_MARK_1 and XA_MARK_2 to catch that bug. Reported-by: Cyrill Gorcunov <gorcunov@gmail.com> Signed-off-by: Matthew Wilcox <willy@infradead.org>
2019-01-14 18:57:31 +00:00
XA_BUG_ON(xa, xa_get_mark(xa, i, XA_MARK_1));
XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_2));
xarray: Move multiorder_shrink to kernel tests Test this functionality inside the kernel as well as in userspace. Also remove insert_bug() as there's no comparable thing to test in the XArray code. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-09-08 16:09:52 +00:00
/* We should see two elements in the array */
XArray tests: Add missing locking Lockdep caught me being sloppy in the test suite and failing to lock the XArray appropriately. Reported-by: kernel test robot <rong.a.chen@intel.com> Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-19 14:36:29 +00:00
rcu_read_lock();
xarray: Move multiorder_shrink to kernel tests Test this functionality inside the kernel as well as in userspace. Also remove insert_bug() as there's no comparable thing to test in the XArray code. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-09-08 16:09:52 +00:00
xas_for_each(&xas, entry, ULONG_MAX)
seen++;
XArray tests: Add missing locking Lockdep caught me being sloppy in the test suite and failing to lock the XArray appropriately. Reported-by: kernel test robot <rong.a.chen@intel.com> Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-19 14:36:29 +00:00
rcu_read_unlock();
xarray: Move multiorder_shrink to kernel tests Test this functionality inside the kernel as well as in userspace. Also remove insert_bug() as there's no comparable thing to test in the XArray code. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-09-08 16:09:52 +00:00
XA_BUG_ON(xa, seen != 2);
/* One of which is marked */
xas_set(&xas, 0);
seen = 0;
XArray tests: Add missing locking Lockdep caught me being sloppy in the test suite and failing to lock the XArray appropriately. Reported-by: kernel test robot <rong.a.chen@intel.com> Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-19 14:36:29 +00:00
rcu_read_lock();
xarray: Move multiorder_shrink to kernel tests Test this functionality inside the kernel as well as in userspace. Also remove insert_bug() as there's no comparable thing to test in the XArray code. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-09-08 16:09:52 +00:00
xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0)
seen++;
XArray tests: Add missing locking Lockdep caught me being sloppy in the test suite and failing to lock the XArray appropriately. Reported-by: kernel test robot <rong.a.chen@intel.com> Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-19 14:36:29 +00:00
rcu_read_unlock();
xarray: Move multiorder_shrink to kernel tests Test this functionality inside the kernel as well as in userspace. Also remove insert_bug() as there's no comparable thing to test in the XArray code. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-09-08 16:09:52 +00:00
XA_BUG_ON(xa, seen != 1);
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
}
XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_0));
XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_1));
XA_BUG_ON(xa, xa_get_mark(xa, next, XA_MARK_2));
xa_erase_index(xa, index);
xa_erase_index(xa, next);
XA_BUG_ON(xa, !xa_empty(xa));
}
XA_BUG_ON(xa, !xa_empty(xa));
xarray: Add XArray marks XArray marks are like the radix tree tags, only slightly more strongly typed. They are renamed in order to distinguish them from tagged pointers. This commit adds the basic get/set/clear operations. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 14:34:31 +00:00
}
radix tree: Remove radix_tree_clear_tags The page cache was the only user of this interface and it has now been converted to the XArray. Transform the test into a test of xas_init_marks(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-04-09 20:52:21 +00:00
static noinline void check_xa_mark_2(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
unsigned long index;
unsigned int count = 0;
void *entry;
xa_store_index(xa, 0, GFP_KERNEL);
xa_set_mark(xa, 0, XA_MARK_0);
xas_lock(&xas);
xas_load(&xas);
xas_init_marks(&xas);
xas_unlock(&xas);
XA_BUG_ON(xa, !xa_get_mark(xa, 0, XA_MARK_0) == 0);
for (index = 3500; index < 4500; index++) {
xa_store_index(xa, index, GFP_KERNEL);
xa_set_mark(xa, index, XA_MARK_0);
}
xas_reset(&xas);
rcu_read_lock();
xas_for_each_marked(&xas, entry, ULONG_MAX, XA_MARK_0)
count++;
rcu_read_unlock();
XA_BUG_ON(xa, count != 1000);
xas_lock(&xas);
xas_for_each(&xas, entry, ULONG_MAX) {
xas_init_marks(&xas);
XA_BUG_ON(xa, !xa_get_mark(xa, xas.xa_index, XA_MARK_0));
XA_BUG_ON(xa, !xas_get_mark(&xas, XA_MARK_0));
}
xas_unlock(&xas);
xa_destroy(xa);
}
xarray: Add XArray marks XArray marks are like the radix tree tags, only slightly more strongly typed. They are renamed in order to distinguish them from tagged pointers. This commit adds the basic get/set/clear operations. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 14:34:31 +00:00
static noinline void check_xa_mark(struct xarray *xa)
{
unsigned long index;
for (index = 0; index < 16384; index += 4)
check_xa_mark_1(xa, index);
radix tree: Remove radix_tree_clear_tags The page cache was the only user of this interface and it has now been converted to the XArray. Transform the test into a test of xas_init_marks(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-04-09 20:52:21 +00:00
check_xa_mark_2(xa);
xarray: Add XArray marks XArray marks are like the radix tree tags, only slightly more strongly typed. They are renamed in order to distinguish them from tagged pointers. This commit adds the basic get/set/clear operations. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 14:34:31 +00:00
}
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
static noinline void check_xa_shrink(struct xarray *xa)
{
XA_STATE(xas, xa, 1);
struct xa_node *node;
xarray: Move multiorder_shrink to kernel tests Test this functionality inside the kernel as well as in userspace. Also remove insert_bug() as there's no comparable thing to test in the XArray code. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-09-08 16:09:52 +00:00
unsigned int order;
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 15 : 1;
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
XA_BUG_ON(xa, !xa_empty(xa));
XA_BUG_ON(xa, xa_store_index(xa, 0, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_store_index(xa, 1, GFP_KERNEL) != NULL);
/*
* Check that erasing the entry at 1 shrinks the tree and properly
* marks the node as being deleted.
*/
xas_lock(&xas);
XA_BUG_ON(xa, xas_load(&xas) != xa_mk_value(1));
node = xas.xa_node;
XA_BUG_ON(xa, xa_entry_locked(xa, node, 0) != xa_mk_value(0));
XA_BUG_ON(xa, xas_store(&xas, NULL) != xa_mk_value(1));
XA_BUG_ON(xa, xa_load(xa, 1) != NULL);
XA_BUG_ON(xa, xas.xa_node != XAS_BOUNDS);
XA_BUG_ON(xa, xa_entry_locked(xa, node, 0) != XA_RETRY_ENTRY);
XA_BUG_ON(xa, xas_load(&xas) != NULL);
xas_unlock(&xas);
XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
xa_erase_index(xa, 0);
XA_BUG_ON(xa, !xa_empty(xa));
xarray: Move multiorder_shrink to kernel tests Test this functionality inside the kernel as well as in userspace. Also remove insert_bug() as there's no comparable thing to test in the XArray code. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-09-08 16:09:52 +00:00
for (order = 0; order < max_order; order++) {
unsigned long max = (1UL << order) - 1;
xa_store_order(xa, 0, order, xa_mk_value(0), GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, max) != xa_mk_value(0));
XA_BUG_ON(xa, xa_load(xa, max + 1) != NULL);
rcu_read_lock();
node = xa_head(xa);
rcu_read_unlock();
XA_BUG_ON(xa, xa_store_index(xa, ULONG_MAX, GFP_KERNEL) !=
NULL);
rcu_read_lock();
XA_BUG_ON(xa, xa_head(xa) == node);
rcu_read_unlock();
XA_BUG_ON(xa, xa_load(xa, max + 1) != NULL);
xa_erase_index(xa, ULONG_MAX);
XA_BUG_ON(xa, xa->xa_head != node);
xa_erase_index(xa, 0);
}
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
}
xarray: Add XArray conditional store operations Like cmpxchg(), xa_cmpxchg will only store to the index if the current entry matches the old entry. It returns the current entry, which is usually more useful than the errno returned by radix_tree_insert(). For the users who really only want the errno, the xa_insert() wrapper provides a more convenient calling convention. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:34:55 +00:00
static noinline void check_cmpxchg(struct xarray *xa)
{
void *FIVE = xa_mk_value(5);
void *SIX = xa_mk_value(6);
void *LOTS = xa_mk_value(12345678);
XA_BUG_ON(xa, !xa_empty(xa));
XA_BUG_ON(xa, xa_store_index(xa, 12345678, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_insert(xa, 12345678, xa, GFP_KERNEL) != -EEXIST);
XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, SIX, FIVE, GFP_KERNEL) != LOTS);
XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, LOTS, FIVE, GFP_KERNEL) != LOTS);
XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, FIVE, LOTS, GFP_KERNEL) != FIVE);
XA_BUG_ON(xa, xa_cmpxchg(xa, 5, FIVE, NULL, GFP_KERNEL) != NULL);
XA_BUG_ON(xa, xa_cmpxchg(xa, 5, NULL, FIVE, GFP_KERNEL) != NULL);
xa_erase_index(xa, 12345678);
xa_erase_index(xa, 5);
XA_BUG_ON(xa, !xa_empty(xa));
}
xarray: Add xa_reserve and xa_release This function reserves a slot in the XArray for users which need to acquire multiple locks before storing their entry in the tree and so cannot use a plain xa_store(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-10-01 18:54:59 +00:00
static noinline void check_reserve(struct xarray *xa)
{
void *entry;
XArray: Change xa_for_each iterator There were three problems with this API: 1. It took too many arguments; almost all users wanted to iterate over every element in the array rather than a subset. 2. It required that 'index' be initialised before use, and there's no realistic way to make GCC catch that. 3. 'index' and 'entry' were the opposite way round from every other member of the XArray APIs. So split it into three different APIs: xa_for_each(xa, index, entry) xa_for_each_start(xa, index, entry, start) xa_for_each_marked(xa, index, entry, filter) Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-12-17 19:45:36 +00:00
unsigned long index;
xarray: Add xa_reserve and xa_release This function reserves a slot in the XArray for users which need to acquire multiple locks before storing their entry in the tree and so cannot use a plain xa_store(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-10-01 18:54:59 +00:00
/* An array with a reserved entry is not empty */
XA_BUG_ON(xa, !xa_empty(xa));
xa_reserve(xa, 12345678, GFP_KERNEL);
XA_BUG_ON(xa, xa_empty(xa));
XA_BUG_ON(xa, xa_load(xa, 12345678));
xa_release(xa, 12345678);
XA_BUG_ON(xa, !xa_empty(xa));
/* Releasing a used entry does nothing */
xa_reserve(xa, 12345678, GFP_KERNEL);
XA_BUG_ON(xa, xa_store_index(xa, 12345678, GFP_NOWAIT) != NULL);
xa_release(xa, 12345678);
xa_erase_index(xa, 12345678);
XA_BUG_ON(xa, !xa_empty(xa));
/* cmpxchg sees a reserved entry as NULL */
xa_reserve(xa, 12345678, GFP_KERNEL);
XA_BUG_ON(xa, xa_cmpxchg(xa, 12345678, NULL, xa_mk_value(12345678),
GFP_NOWAIT) != NULL);
xa_release(xa, 12345678);
xa_erase_index(xa, 12345678);
XA_BUG_ON(xa, !xa_empty(xa));
XArray: Honour reserved entries in xa_insert xa_insert() should treat reserved entries as occupied, not as available. Also, it should treat requests to insert a NULL pointer as a request to reserve the slot. Add xa_insert_bh() and xa_insert_irq() for completeness. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2019-01-02 18:57:03 +00:00
/* But xa_insert does not */
XArray: Regularise xa_reserve The xa_reserve() function was a little unusual in that it attempted to be callable for all kinds of locking scenarios. Make it look like the other APIs with __xa_reserve, xa_reserve_bh and xa_reserve_irq variants. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-10-30 13:45:55 +00:00
xa_reserve(xa, 12345678, GFP_KERNEL);
XArray: Honour reserved entries in xa_insert xa_insert() should treat reserved entries as occupied, not as available. Also, it should treat requests to insert a NULL pointer as a request to reserve the slot. Add xa_insert_bh() and xa_insert_irq() for completeness. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2019-01-02 18:57:03 +00:00
XA_BUG_ON(xa, xa_insert(xa, 12345678, xa_mk_value(12345678), 0) !=
-EEXIST);
XA_BUG_ON(xa, xa_empty(xa));
XA_BUG_ON(xa, xa_erase(xa, 12345678) != NULL);
XArray: Regularise xa_reserve The xa_reserve() function was a little unusual in that it attempted to be callable for all kinds of locking scenarios. Make it look like the other APIs with __xa_reserve, xa_reserve_bh and xa_reserve_irq variants. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-10-30 13:45:55 +00:00
XA_BUG_ON(xa, !xa_empty(xa));
xarray: Add xa_reserve and xa_release This function reserves a slot in the XArray for users which need to acquire multiple locks before storing their entry in the tree and so cannot use a plain xa_store(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-10-01 18:54:59 +00:00
/* Can iterate through a reserved entry */
xa_store_index(xa, 5, GFP_KERNEL);
xa_reserve(xa, 6, GFP_KERNEL);
xa_store_index(xa, 7, GFP_KERNEL);
XArray: Change xa_for_each iterator There were three problems with this API: 1. It took too many arguments; almost all users wanted to iterate over every element in the array rather than a subset. 2. It required that 'index' be initialised before use, and there's no realistic way to make GCC catch that. 3. 'index' and 'entry' were the opposite way round from every other member of the XArray APIs. So split it into three different APIs: xa_for_each(xa, index, entry) xa_for_each_start(xa, index, entry, start) xa_for_each_marked(xa, index, entry, filter) Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-12-17 19:45:36 +00:00
xa_for_each(xa, index, entry) {
xarray: Add xa_reserve and xa_release This function reserves a slot in the XArray for users which need to acquire multiple locks before storing their entry in the tree and so cannot use a plain xa_store(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-10-01 18:54:59 +00:00
XA_BUG_ON(xa, index != 5 && index != 7);
}
xa_destroy(xa);
}
xarray: Add XArray iterators The xa_for_each iterator allows the user to efficiently walk a range of the array, executing the loop body once for each entry in that range that matches the filter. This commit also includes xa_find() and xa_find_after() which are helper functions for xa_for_each() but may also be useful in their own right. In the xas family of functions, we have xas_for_each(), xas_find(), xas_next_entry(), xas_for_each_tagged(), xas_find_tagged(), xas_next_tagged() and xas_pause(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-14 13:30:11 +00:00
static noinline void check_xas_erase(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
void *entry;
unsigned long i, j;
for (i = 0; i < 200; i++) {
for (j = i; j < 2 * i + 17; j++) {
xas_set(&xas, j);
do {
xas_lock(&xas);
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
xas_store(&xas, xa_mk_index(j));
xarray: Add XArray iterators The xa_for_each iterator allows the user to efficiently walk a range of the array, executing the loop body once for each entry in that range that matches the filter. This commit also includes xa_find() and xa_find_after() which are helper functions for xa_for_each() but may also be useful in their own right. In the xas family of functions, we have xas_for_each(), xas_find(), xas_next_entry(), xas_for_each_tagged(), xas_find_tagged(), xas_next_tagged() and xas_pause(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-14 13:30:11 +00:00
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
}
xas_set(&xas, ULONG_MAX);
do {
xas_lock(&xas);
xas_store(&xas, xa_mk_value(0));
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
xas_lock(&xas);
xas_store(&xas, NULL);
xas_set(&xas, 0);
j = i;
xas_for_each(&xas, entry, ULONG_MAX) {
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, entry != xa_mk_index(j));
xarray: Add XArray iterators The xa_for_each iterator allows the user to efficiently walk a range of the array, executing the loop body once for each entry in that range that matches the filter. This commit also includes xa_find() and xa_find_after() which are helper functions for xa_for_each() but may also be useful in their own right. In the xas family of functions, we have xas_for_each(), xas_find(), xas_next_entry(), xas_for_each_tagged(), xas_find_tagged(), xas_next_tagged() and xas_pause(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-14 13:30:11 +00:00
xas_store(&xas, NULL);
j++;
}
xas_unlock(&xas);
XA_BUG_ON(xa, !xa_empty(xa));
}
}
xarray: Move multiorder_check to in-kernel tests This version is a little less thorough in order to be a little quicker, but tests the important edge cases. Also test adding a multiorder entry at a non-canonical index, and erasing it. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-09-09 05:52:17 +00:00
#ifdef CONFIG_XARRAY_MULTI
static noinline void check_multi_store_1(struct xarray *xa, unsigned long index,
unsigned int order)
{
XA_STATE(xas, xa, index);
unsigned long min = index & ~((1UL << order) - 1);
unsigned long max = min + (1UL << order);
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(index));
XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(index));
xarray: Move multiorder_check to in-kernel tests This version is a little less thorough in order to be a little quicker, but tests the important edge cases. Also test adding a multiorder entry at a non-canonical index, and erasing it. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-09-09 05:52:17 +00:00
XA_BUG_ON(xa, xa_load(xa, max) != NULL);
XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL);
XArray tests: Add missing locking Lockdep caught me being sloppy in the test suite and failing to lock the XArray appropriately. Reported-by: kernel test robot <rong.a.chen@intel.com> Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-19 14:36:29 +00:00
xas_lock(&xas);
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, xas_store(&xas, xa_mk_index(min)) != xa_mk_index(index));
XArray tests: Add missing locking Lockdep caught me being sloppy in the test suite and failing to lock the XArray appropriately. Reported-by: kernel test robot <rong.a.chen@intel.com> Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-19 14:36:29 +00:00
xas_unlock(&xas);
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, xa_load(xa, min) != xa_mk_index(min));
XA_BUG_ON(xa, xa_load(xa, max - 1) != xa_mk_index(min));
xarray: Move multiorder_check to in-kernel tests This version is a little less thorough in order to be a little quicker, but tests the important edge cases. Also test adding a multiorder entry at a non-canonical index, and erasing it. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-09-09 05:52:17 +00:00
XA_BUG_ON(xa, xa_load(xa, max) != NULL);
XA_BUG_ON(xa, xa_load(xa, min - 1) != NULL);
xa_erase_index(xa, min);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_multi_store_2(struct xarray *xa, unsigned long index,
unsigned int order)
{
XA_STATE(xas, xa, index);
xa_store_order(xa, index, order, xa_mk_value(0), GFP_KERNEL);
XArray tests: Add missing locking Lockdep caught me being sloppy in the test suite and failing to lock the XArray appropriately. Reported-by: kernel test robot <rong.a.chen@intel.com> Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-19 14:36:29 +00:00
xas_lock(&xas);
xarray: Move multiorder_check to in-kernel tests This version is a little less thorough in order to be a little quicker, but tests the important edge cases. Also test adding a multiorder entry at a non-canonical index, and erasing it. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-09-09 05:52:17 +00:00
XA_BUG_ON(xa, xas_store(&xas, xa_mk_value(1)) != xa_mk_value(0));
XA_BUG_ON(xa, xas.xa_index != index);
XA_BUG_ON(xa, xas_store(&xas, NULL) != xa_mk_value(1));
XArray tests: Add missing locking Lockdep caught me being sloppy in the test suite and failing to lock the XArray appropriately. Reported-by: kernel test robot <rong.a.chen@intel.com> Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-19 14:36:29 +00:00
xas_unlock(&xas);
xarray: Move multiorder_check to in-kernel tests This version is a little less thorough in order to be a little quicker, but tests the important edge cases. Also test adding a multiorder entry at a non-canonical index, and erasing it. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-09-09 05:52:17 +00:00
XA_BUG_ON(xa, !xa_empty(xa));
}
XArray tests: Check iterating over multiorder entries There was no bug here, but there was no test coverage for this scenario. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-29 21:04:35 +00:00
static noinline void check_multi_store_3(struct xarray *xa, unsigned long index,
unsigned int order)
{
XA_STATE(xas, xa, 0);
void *entry;
int n = 0;
xa_store_order(xa, index, order, xa_mk_index(index), GFP_KERNEL);
xas_lock(&xas);
xas_for_each(&xas, entry, ULONG_MAX) {
XA_BUG_ON(xa, entry != xa_mk_index(index));
n++;
}
XA_BUG_ON(xa, n != 1);
xas_set(&xas, index + 1);
xas_for_each(&xas, entry, ULONG_MAX) {
XA_BUG_ON(xa, entry != xa_mk_index(index));
n++;
}
XA_BUG_ON(xa, n != 2);
xas_unlock(&xas);
xa_destroy(xa);
}
xarray: Move multiorder_check to in-kernel tests This version is a little less thorough in order to be a little quicker, but tests the important edge cases. Also test adding a multiorder entry at a non-canonical index, and erasing it. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-09-09 05:52:17 +00:00
#endif
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
static noinline void check_multi_store(struct xarray *xa)
{
#ifdef CONFIG_XARRAY_MULTI
unsigned long i, j, k;
unsigned int max_order = (sizeof(long) == 4) ? 30 : 60;
/* Loading from any position returns the same value */
xa_store_order(xa, 0, 1, xa_mk_value(0), GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0));
XA_BUG_ON(xa, xa_load(xa, 2) != NULL);
rcu_read_lock();
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 2);
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2);
rcu_read_unlock();
/* Storing adjacent to the value does not alter the value */
xa_store(xa, 3, xa, GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(0));
XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(0));
XA_BUG_ON(xa, xa_load(xa, 2) != NULL);
rcu_read_lock();
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 3);
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 2);
rcu_read_unlock();
/* Overwriting multiple indexes works */
xa_store_order(xa, 0, 2, xa_mk_value(1), GFP_KERNEL);
XA_BUG_ON(xa, xa_load(xa, 0) != xa_mk_value(1));
XA_BUG_ON(xa, xa_load(xa, 1) != xa_mk_value(1));
XA_BUG_ON(xa, xa_load(xa, 2) != xa_mk_value(1));
XA_BUG_ON(xa, xa_load(xa, 3) != xa_mk_value(1));
XA_BUG_ON(xa, xa_load(xa, 4) != NULL);
rcu_read_lock();
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->count != 4);
XA_BUG_ON(xa, xa_to_node(xa_head(xa))->nr_values != 4);
rcu_read_unlock();
/* We can erase multiple values with a single store */
XArray tests: Correct some 64-bit assumptions The test-suite caught these two mistakes when compiled for 32-bit. I had only been running the test-suite in 64-bit mode. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 14:34:04 +00:00
xa_store_order(xa, 0, BITS_PER_LONG - 1, NULL, GFP_KERNEL);
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
XA_BUG_ON(xa, !xa_empty(xa));
/* Even when the first slot is empty but the others aren't */
xa_store_index(xa, 1, GFP_KERNEL);
xa_store_index(xa, 2, GFP_KERNEL);
xa_store_order(xa, 0, 2, NULL, GFP_KERNEL);
XA_BUG_ON(xa, !xa_empty(xa));
for (i = 0; i < max_order; i++) {
for (j = 0; j < max_order; j++) {
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
xa_store_order(xa, 0, i, xa_mk_index(i), GFP_KERNEL);
xa_store_order(xa, 0, j, xa_mk_index(j), GFP_KERNEL);
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
for (k = 0; k < max_order; k++) {
void *entry = xa_load(xa, (1UL << k) - 1);
if ((i < k) && (j < k))
XA_BUG_ON(xa, entry != NULL);
else
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, entry != xa_mk_index(j));
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
}
xa_erase(xa, 0);
XA_BUG_ON(xa, !xa_empty(xa));
}
}
xarray: Move multiorder_check to in-kernel tests This version is a little less thorough in order to be a little quicker, but tests the important edge cases. Also test adding a multiorder entry at a non-canonical index, and erasing it. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-09-09 05:52:17 +00:00
for (i = 0; i < 20; i++) {
check_multi_store_1(xa, 200, i);
check_multi_store_1(xa, 0, i);
check_multi_store_1(xa, (1UL << i) + 1, i);
}
check_multi_store_2(xa, 4095, 9);
XArray tests: Check iterating over multiorder entries There was no bug here, but there was no test coverage for this scenario. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-29 21:04:35 +00:00
for (i = 1; i < 20; i++) {
check_multi_store_3(xa, 0, i);
check_multi_store_3(xa, 1UL << i, i);
}
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
#endif
}
xarray: Track free entries in an XArray Add the optional ability to track which entries in an XArray are free and provide xa_alloc() to replace most of the functionality of the IDR. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-07-04 14:50:12 +00:00
static DEFINE_XARRAY_ALLOC(xa0);
static noinline void check_xa_alloc(void)
{
int i;
u32 id;
/* An empty array should assign 0 to the first alloc */
xa_alloc_index(&xa0, 0, GFP_KERNEL);
/* Erasing it should make the array empty again */
xa_erase_index(&xa0, 0);
XA_BUG_ON(&xa0, !xa_empty(&xa0));
/* And it should assign 0 again */
xa_alloc_index(&xa0, 0, GFP_KERNEL);
/* The next assigned ID should be 1 */
xa_alloc_index(&xa0, 1, GFP_KERNEL);
xa_erase_index(&xa0, 1);
/* Storing a value should mark it used */
xa_store_index(&xa0, 1, GFP_KERNEL);
xa_alloc_index(&xa0, 2, GFP_KERNEL);
/* If we then erase 0, it should be free */
xa_erase_index(&xa0, 0);
xa_alloc_index(&xa0, 0, GFP_KERNEL);
xa_erase_index(&xa0, 1);
xa_erase_index(&xa0, 2);
for (i = 1; i < 5000; i++) {
xa_alloc_index(&xa0, i, GFP_KERNEL);
}
xa_destroy(&xa0);
id = 0xfffffffeU;
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(&xa0, xa_alloc(&xa0, &id, UINT_MAX, xa_mk_index(id),
xarray: Track free entries in an XArray Add the optional ability to track which entries in an XArray are free and provide xa_alloc() to replace most of the functionality of the IDR. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-07-04 14:50:12 +00:00
GFP_KERNEL) != 0);
XA_BUG_ON(&xa0, id != 0xfffffffeU);
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(&xa0, xa_alloc(&xa0, &id, UINT_MAX, xa_mk_index(id),
xarray: Track free entries in an XArray Add the optional ability to track which entries in an XArray are free and provide xa_alloc() to replace most of the functionality of the IDR. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-07-04 14:50:12 +00:00
GFP_KERNEL) != 0);
XA_BUG_ON(&xa0, id != 0xffffffffU);
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(&xa0, xa_alloc(&xa0, &id, UINT_MAX, xa_mk_index(id),
xarray: Track free entries in an XArray Add the optional ability to track which entries in an XArray are free and provide xa_alloc() to replace most of the functionality of the IDR. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-07-04 14:50:12 +00:00
GFP_KERNEL) != -ENOSPC);
XA_BUG_ON(&xa0, id != 0xffffffffU);
xa_destroy(&xa0);
XArray: Fix xa_alloc when id exceeds max Specifying a starting ID greater than the maximum ID isn't something attempted very often, but it should fail. It was succeeding due to xas_find_marked() returning the wrong error state, so add tests for both xa_alloc() and xas_find_marked(). Fixes: b803b42823d0 ("xarray: Add XArray iterators") Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-12-13 18:57:42 +00:00
id = 10;
XA_BUG_ON(&xa0, xa_alloc(&xa0, &id, 5, xa_mk_index(id),
GFP_KERNEL) != -ENOSPC);
XA_BUG_ON(&xa0, xa_store_index(&xa0, 3, GFP_KERNEL) != 0);
XA_BUG_ON(&xa0, xa_alloc(&xa0, &id, 5, xa_mk_index(id),
GFP_KERNEL) != -ENOSPC);
xa_erase_index(&xa0, 3);
XA_BUG_ON(&xa0, !xa_empty(&xa0));
xarray: Track free entries in an XArray Add the optional ability to track which entries in an XArray are free and provide xa_alloc() to replace most of the functionality of the IDR. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-07-04 14:50:12 +00:00
}
xarray: Add xas_for_each_conflict This iterator iterates over each entry that is stored in the index or indices specified by the xa_state. This is intended for use for a conditional store of a multiindex entry, or to allow entries which are about to be removed from the xarray to be disposed of properly. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-06-02 02:46:02 +00:00
static noinline void __check_store_iter(struct xarray *xa, unsigned long start,
unsigned int order, unsigned int present)
{
XA_STATE_ORDER(xas, xa, start, order);
void *entry;
unsigned int count = 0;
retry:
xas_lock(&xas);
xas_for_each_conflict(&xas, entry) {
XA_BUG_ON(xa, !xa_is_value(entry));
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, entry < xa_mk_index(start));
XA_BUG_ON(xa, entry > xa_mk_index(start + (1UL << order) - 1));
xarray: Add xas_for_each_conflict This iterator iterates over each entry that is stored in the index or indices specified by the xa_state. This is intended for use for a conditional store of a multiindex entry, or to allow entries which are about to be removed from the xarray to be disposed of properly. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-06-02 02:46:02 +00:00
count++;
}
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
xas_store(&xas, xa_mk_index(start));
xarray: Add xas_for_each_conflict This iterator iterates over each entry that is stored in the index or indices specified by the xa_state. This is intended for use for a conditional store of a multiindex entry, or to allow entries which are about to be removed from the xarray to be disposed of properly. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-06-02 02:46:02 +00:00
xas_unlock(&xas);
if (xas_nomem(&xas, GFP_KERNEL)) {
count = 0;
goto retry;
}
XA_BUG_ON(xa, xas_error(&xas));
XA_BUG_ON(xa, count != present);
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, xa_load(xa, start) != xa_mk_index(start));
xarray: Add xas_for_each_conflict This iterator iterates over each entry that is stored in the index or indices specified by the xa_state. This is intended for use for a conditional store of a multiindex entry, or to allow entries which are about to be removed from the xarray to be disposed of properly. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-06-02 02:46:02 +00:00
XA_BUG_ON(xa, xa_load(xa, start + (1UL << order) - 1) !=
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
xa_mk_index(start));
xarray: Add xas_for_each_conflict This iterator iterates over each entry that is stored in the index or indices specified by the xa_state. This is intended for use for a conditional store of a multiindex entry, or to allow entries which are about to be removed from the xarray to be disposed of properly. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-06-02 02:46:02 +00:00
xa_erase_index(xa, start);
}
static noinline void check_store_iter(struct xarray *xa)
{
unsigned int i, j;
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 20 : 1;
for (i = 0; i < max_order; i++) {
unsigned int min = 1 << i;
unsigned int max = (2 << i) - 1;
__check_store_iter(xa, 0, i, 0);
XA_BUG_ON(xa, !xa_empty(xa));
__check_store_iter(xa, min, i, 0);
XA_BUG_ON(xa, !xa_empty(xa));
xa_store_index(xa, min, GFP_KERNEL);
__check_store_iter(xa, min, i, 1);
XA_BUG_ON(xa, !xa_empty(xa));
xa_store_index(xa, max, GFP_KERNEL);
__check_store_iter(xa, min, i, 1);
XA_BUG_ON(xa, !xa_empty(xa));
for (j = 0; j < min; j++)
xa_store_index(xa, j, GFP_KERNEL);
__check_store_iter(xa, 0, i, min);
XA_BUG_ON(xa, !xa_empty(xa));
for (j = 0; j < min; j++)
xa_store_index(xa, min + j, GFP_KERNEL);
__check_store_iter(xa, min, i, min);
XA_BUG_ON(xa, !xa_empty(xa));
}
#ifdef CONFIG_XARRAY_MULTI
xa_store_index(xa, 63, GFP_KERNEL);
xa_store_index(xa, 65, GFP_KERNEL);
__check_store_iter(xa, 64, 2, 1);
xa_erase_index(xa, 63);
#endif
XA_BUG_ON(xa, !xa_empty(xa));
}
xarray: Add XArray iterators The xa_for_each iterator allows the user to efficiently walk a range of the array, executing the loop body once for each entry in that range that matches the filter. This commit also includes xa_find() and xa_find_after() which are helper functions for xa_for_each() but may also be useful in their own right. In the xas family of functions, we have xas_for_each(), xas_find(), xas_next_entry(), xas_for_each_tagged(), xas_find_tagged(), xas_next_tagged() and xas_pause(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-14 13:30:11 +00:00
static noinline void check_multi_find(struct xarray *xa)
{
#ifdef CONFIG_XARRAY_MULTI
unsigned long index;
xa_store_order(xa, 12, 2, xa_mk_value(12), GFP_KERNEL);
XA_BUG_ON(xa, xa_store_index(xa, 16, GFP_KERNEL) != NULL);
index = 0;
XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
xa_mk_value(12));
XA_BUG_ON(xa, index != 12);
index = 13;
XA_BUG_ON(xa, xa_find(xa, &index, ULONG_MAX, XA_PRESENT) !=
xa_mk_value(12));
XA_BUG_ON(xa, (index < 12) || (index >= 16));
XA_BUG_ON(xa, xa_find_after(xa, &index, ULONG_MAX, XA_PRESENT) !=
xa_mk_value(16));
XA_BUG_ON(xa, index != 16);
xa_erase_index(xa, 12);
xa_erase_index(xa, 16);
XA_BUG_ON(xa, !xa_empty(xa));
#endif
}
static noinline void check_multi_find_2(struct xarray *xa)
{
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 10 : 1;
unsigned int i, j;
void *entry;
for (i = 0; i < max_order; i++) {
unsigned long index = 1UL << i;
for (j = 0; j < index; j++) {
XA_STATE(xas, xa, j + index);
xa_store_index(xa, index - 1, GFP_KERNEL);
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
xa_store_order(xa, index, i, xa_mk_index(index),
xarray: Add XArray iterators The xa_for_each iterator allows the user to efficiently walk a range of the array, executing the loop body once for each entry in that range that matches the filter. This commit also includes xa_find() and xa_find_after() which are helper functions for xa_for_each() but may also be useful in their own right. In the xas family of functions, we have xas_for_each(), xas_find(), xas_next_entry(), xas_for_each_tagged(), xas_find_tagged(), xas_next_tagged() and xas_pause(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-14 13:30:11 +00:00
GFP_KERNEL);
rcu_read_lock();
xas_for_each(&xas, entry, ULONG_MAX) {
xa_erase_index(xa, index);
}
rcu_read_unlock();
xa_erase_index(xa, index - 1);
XA_BUG_ON(xa, !xa_empty(xa));
}
}
}
XArray: Fix xa_for_each with a single element at 0 The following sequence of calls would result in an infinite loop in xa_find_after(): xa_store(xa, 0, x, GFP_KERNEL); index = 0; xa_for_each(xa, entry, index, ULONG_MAX, XA_PRESENT) { } xa_find_after() was confusing the situation where we found no entry in the tree with finding a multiorder entry, so it would look for the successor entry forever. Just check for this case explicitly. Includes a few new checks in the test suite to be sure this doesn't reappear. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-01 20:55:19 +00:00
static noinline void check_find_1(struct xarray *xa)
xarray: Add XArray iterators The xa_for_each iterator allows the user to efficiently walk a range of the array, executing the loop body once for each entry in that range that matches the filter. This commit also includes xa_find() and xa_find_after() which are helper functions for xa_for_each() but may also be useful in their own right. In the xas family of functions, we have xas_for_each(), xas_find(), xas_next_entry(), xas_for_each_tagged(), xas_find_tagged(), xas_next_tagged() and xas_pause(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-14 13:30:11 +00:00
{
unsigned long i, j, k;
XA_BUG_ON(xa, !xa_empty(xa));
/*
* Check xa_find with all pairs between 0 and 99 inclusive,
* starting at every index between 0 and 99
*/
for (i = 0; i < 100; i++) {
XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
xa_set_mark(xa, i, XA_MARK_0);
for (j = 0; j < i; j++) {
XA_BUG_ON(xa, xa_store_index(xa, j, GFP_KERNEL) !=
NULL);
xa_set_mark(xa, j, XA_MARK_0);
for (k = 0; k < 100; k++) {
unsigned long index = k;
void *entry = xa_find(xa, &index, ULONG_MAX,
XA_PRESENT);
if (k <= j)
XA_BUG_ON(xa, index != j);
else if (k <= i)
XA_BUG_ON(xa, index != i);
else
XA_BUG_ON(xa, entry != NULL);
index = k;
entry = xa_find(xa, &index, ULONG_MAX,
XA_MARK_0);
if (k <= j)
XA_BUG_ON(xa, index != j);
else if (k <= i)
XA_BUG_ON(xa, index != i);
else
XA_BUG_ON(xa, entry != NULL);
}
xa_erase_index(xa, j);
XA_BUG_ON(xa, xa_get_mark(xa, j, XA_MARK_0));
XA_BUG_ON(xa, !xa_get_mark(xa, i, XA_MARK_0));
}
xa_erase_index(xa, i);
XA_BUG_ON(xa, xa_get_mark(xa, i, XA_MARK_0));
}
XA_BUG_ON(xa, !xa_empty(xa));
XArray: Fix xa_for_each with a single element at 0 The following sequence of calls would result in an infinite loop in xa_find_after(): xa_store(xa, 0, x, GFP_KERNEL); index = 0; xa_for_each(xa, entry, index, ULONG_MAX, XA_PRESENT) { } xa_find_after() was confusing the situation where we found no entry in the tree with finding a multiorder entry, so it would look for the successor entry forever. Just check for this case explicitly. Includes a few new checks in the test suite to be sure this doesn't reappear. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-01 20:55:19 +00:00
}
static noinline void check_find_2(struct xarray *xa)
{
void *entry;
XArray: Change xa_for_each iterator There were three problems with this API: 1. It took too many arguments; almost all users wanted to iterate over every element in the array rather than a subset. 2. It required that 'index' be initialised before use, and there's no realistic way to make GCC catch that. 3. 'index' and 'entry' were the opposite way round from every other member of the XArray APIs. So split it into three different APIs: xa_for_each(xa, index, entry) xa_for_each_start(xa, index, entry, start) xa_for_each_marked(xa, index, entry, filter) Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-12-17 19:45:36 +00:00
unsigned long i, j, index;
XArray: Fix xa_for_each with a single element at 0 The following sequence of calls would result in an infinite loop in xa_find_after(): xa_store(xa, 0, x, GFP_KERNEL); index = 0; xa_for_each(xa, entry, index, ULONG_MAX, XA_PRESENT) { } xa_find_after() was confusing the situation where we found no entry in the tree with finding a multiorder entry, so it would look for the successor entry forever. Just check for this case explicitly. Includes a few new checks in the test suite to be sure this doesn't reappear. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-01 20:55:19 +00:00
XArray: Change xa_for_each iterator There were three problems with this API: 1. It took too many arguments; almost all users wanted to iterate over every element in the array rather than a subset. 2. It required that 'index' be initialised before use, and there's no realistic way to make GCC catch that. 3. 'index' and 'entry' were the opposite way round from every other member of the XArray APIs. So split it into three different APIs: xa_for_each(xa, index, entry) xa_for_each_start(xa, index, entry, start) xa_for_each_marked(xa, index, entry, filter) Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-12-17 19:45:36 +00:00
xa_for_each(xa, index, entry) {
XArray: Fix xa_for_each with a single element at 0 The following sequence of calls would result in an infinite loop in xa_find_after(): xa_store(xa, 0, x, GFP_KERNEL); index = 0; xa_for_each(xa, entry, index, ULONG_MAX, XA_PRESENT) { } xa_find_after() was confusing the situation where we found no entry in the tree with finding a multiorder entry, so it would look for the successor entry forever. Just check for this case explicitly. Includes a few new checks in the test suite to be sure this doesn't reappear. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-01 20:55:19 +00:00
XA_BUG_ON(xa, true);
}
for (i = 0; i < 1024; i++) {
xa_store_index(xa, index, GFP_KERNEL);
j = 0;
XArray: Change xa_for_each iterator There were three problems with this API: 1. It took too many arguments; almost all users wanted to iterate over every element in the array rather than a subset. 2. It required that 'index' be initialised before use, and there's no realistic way to make GCC catch that. 3. 'index' and 'entry' were the opposite way round from every other member of the XArray APIs. So split it into three different APIs: xa_for_each(xa, index, entry) xa_for_each_start(xa, index, entry, start) xa_for_each_marked(xa, index, entry, filter) Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-12-17 19:45:36 +00:00
xa_for_each(xa, index, entry) {
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, xa_mk_index(index) != entry);
XArray: Fix xa_for_each with a single element at 0 The following sequence of calls would result in an infinite loop in xa_find_after(): xa_store(xa, 0, x, GFP_KERNEL); index = 0; xa_for_each(xa, entry, index, ULONG_MAX, XA_PRESENT) { } xa_find_after() was confusing the situation where we found no entry in the tree with finding a multiorder entry, so it would look for the successor entry forever. Just check for this case explicitly. Includes a few new checks in the test suite to be sure this doesn't reappear. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-01 20:55:19 +00:00
XA_BUG_ON(xa, index != j++);
}
}
xa_destroy(xa);
}
XArray: Fix xa_alloc when id exceeds max Specifying a starting ID greater than the maximum ID isn't something attempted very often, but it should fail. It was succeeding due to xas_find_marked() returning the wrong error state, so add tests for both xa_alloc() and xas_find_marked(). Fixes: b803b42823d0 ("xarray: Add XArray iterators") Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-12-13 18:57:42 +00:00
static noinline void check_find_3(struct xarray *xa)
{
XA_STATE(xas, xa, 0);
unsigned long i, j, k;
void *entry;
for (i = 0; i < 100; i++) {
for (j = 0; j < 100; j++) {
XArray tests: Add RCU locking 0day picked up that I'd forgotten to add locking to this new test. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-12-17 22:37:25 +00:00
rcu_read_lock();
XArray: Fix xa_alloc when id exceeds max Specifying a starting ID greater than the maximum ID isn't something attempted very often, but it should fail. It was succeeding due to xas_find_marked() returning the wrong error state, so add tests for both xa_alloc() and xas_find_marked(). Fixes: b803b42823d0 ("xarray: Add XArray iterators") Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-12-13 18:57:42 +00:00
for (k = 0; k < 100; k++) {
xas_set(&xas, j);
xas_for_each_marked(&xas, entry, k, XA_MARK_0)
;
if (j > k)
XA_BUG_ON(xa,
xas.xa_node != XAS_RESTART);
}
XArray tests: Add RCU locking 0day picked up that I'd forgotten to add locking to this new test. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-12-17 22:37:25 +00:00
rcu_read_unlock();
XArray: Fix xa_alloc when id exceeds max Specifying a starting ID greater than the maximum ID isn't something attempted very often, but it should fail. It was succeeding due to xas_find_marked() returning the wrong error state, so add tests for both xa_alloc() and xas_find_marked(). Fixes: b803b42823d0 ("xarray: Add XArray iterators") Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-12-13 18:57:42 +00:00
}
xa_store_index(xa, i, GFP_KERNEL);
xa_set_mark(xa, i, XA_MARK_0);
}
xa_destroy(xa);
}
XArray: Fix xa_for_each with a single element at 0 The following sequence of calls would result in an infinite loop in xa_find_after(): xa_store(xa, 0, x, GFP_KERNEL); index = 0; xa_for_each(xa, entry, index, ULONG_MAX, XA_PRESENT) { } xa_find_after() was confusing the situation where we found no entry in the tree with finding a multiorder entry, so it would look for the successor entry forever. Just check for this case explicitly. Includes a few new checks in the test suite to be sure this doesn't reappear. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-01 20:55:19 +00:00
static noinline void check_find(struct xarray *xa)
{
check_find_1(xa);
check_find_2(xa);
XArray: Fix xa_alloc when id exceeds max Specifying a starting ID greater than the maximum ID isn't something attempted very often, but it should fail. It was succeeding due to xas_find_marked() returning the wrong error state, so add tests for both xa_alloc() and xas_find_marked(). Fixes: b803b42823d0 ("xarray: Add XArray iterators") Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-12-13 18:57:42 +00:00
check_find_3(xa);
xarray: Add XArray iterators The xa_for_each iterator allows the user to efficiently walk a range of the array, executing the loop body once for each entry in that range that matches the filter. This commit also includes xa_find() and xa_find_after() which are helper functions for xa_for_each() but may also be useful in their own right. In the xas family of functions, we have xas_for_each(), xas_find(), xas_next_entry(), xas_for_each_tagged(), xas_find_tagged(), xas_next_tagged() and xas_pause(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-14 13:30:11 +00:00
check_multi_find(xa);
check_multi_find_2(xa);
}
shmem: Convert find_swap_entry to XArray This is a 1:1 conversion. The major part of this patch is converting the test framework from userspace to kernel space and mirroring the algorithm now used in find_swap_entry(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-22 13:36:00 +00:00
/* See find_swap_entry() in mm/shmem.c */
static noinline unsigned long xa_find_entry(struct xarray *xa, void *item)
{
XA_STATE(xas, xa, 0);
unsigned int checked = 0;
void *entry;
rcu_read_lock();
xas_for_each(&xas, entry, ULONG_MAX) {
if (xas_retry(&xas, entry))
continue;
if (entry == item)
break;
checked++;
if ((checked % 4) != 0)
continue;
xas_pause(&xas);
}
rcu_read_unlock();
return entry ? xas.xa_index : -1;
}
static noinline void check_find_entry(struct xarray *xa)
{
#ifdef CONFIG_XARRAY_MULTI
unsigned int order;
unsigned long offset, index;
for (order = 0; order < 20; order++) {
for (offset = 0; offset < (1UL << (order + 3));
offset += (1UL << order)) {
for (index = 0; index < (1UL << (order + 5));
index += (1UL << order)) {
xa_store_order(xa, index, order,
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
xa_mk_index(index), GFP_KERNEL);
shmem: Convert find_swap_entry to XArray This is a 1:1 conversion. The major part of this patch is converting the test framework from userspace to kernel space and mirroring the algorithm now used in find_swap_entry(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-22 13:36:00 +00:00
XA_BUG_ON(xa, xa_load(xa, index) !=
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
xa_mk_index(index));
shmem: Convert find_swap_entry to XArray This is a 1:1 conversion. The major part of this patch is converting the test framework from userspace to kernel space and mirroring the algorithm now used in find_swap_entry(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-22 13:36:00 +00:00
XA_BUG_ON(xa, xa_find_entry(xa,
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
xa_mk_index(index)) != index);
shmem: Convert find_swap_entry to XArray This is a 1:1 conversion. The major part of this patch is converting the test framework from userspace to kernel space and mirroring the algorithm now used in find_swap_entry(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-22 13:36:00 +00:00
}
XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1);
xa_destroy(xa);
}
}
#endif
XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1);
xa_store_index(xa, ULONG_MAX, GFP_KERNEL);
XA_BUG_ON(xa, xa_find_entry(xa, xa) != -1);
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, xa_find_entry(xa, xa_mk_index(ULONG_MAX)) != -1);
shmem: Convert find_swap_entry to XArray This is a 1:1 conversion. The major part of this patch is converting the test framework from userspace to kernel space and mirroring the algorithm now used in find_swap_entry(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-22 13:36:00 +00:00
xa_erase_index(xa, ULONG_MAX);
XA_BUG_ON(xa, !xa_empty(xa));
}
xarray: Step through an XArray The xas_next and xas_prev functions move the xas index by one position, and adjust the rest of the iterator state to match it. This is more efficient than calling xas_set() as it keeps the iterator at the leaves of the tree instead of walking the iterator from the root each time. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-12-01 05:06:52 +00:00
static noinline void check_move_small(struct xarray *xa, unsigned long idx)
{
XA_STATE(xas, xa, 0);
unsigned long i;
xa_store_index(xa, 0, GFP_KERNEL);
xa_store_index(xa, idx, GFP_KERNEL);
rcu_read_lock();
for (i = 0; i < idx * 4; i++) {
void *entry = xas_next(&xas);
if (i <= idx)
XA_BUG_ON(xa, xas.xa_node == XAS_RESTART);
XA_BUG_ON(xa, xas.xa_index != i);
if (i == 0 || i == idx)
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, entry != xa_mk_index(i));
xarray: Step through an XArray The xas_next and xas_prev functions move the xas index by one position, and adjust the rest of the iterator state to match it. This is more efficient than calling xas_set() as it keeps the iterator at the leaves of the tree instead of walking the iterator from the root each time. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-12-01 05:06:52 +00:00
else
XA_BUG_ON(xa, entry != NULL);
}
xas_next(&xas);
XA_BUG_ON(xa, xas.xa_index != i);
do {
void *entry = xas_prev(&xas);
i--;
if (i <= idx)
XA_BUG_ON(xa, xas.xa_node == XAS_RESTART);
XA_BUG_ON(xa, xas.xa_index != i);
if (i == 0 || i == idx)
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, entry != xa_mk_index(i));
xarray: Step through an XArray The xas_next and xas_prev functions move the xas index by one position, and adjust the rest of the iterator state to match it. This is more efficient than calling xas_set() as it keeps the iterator at the leaves of the tree instead of walking the iterator from the root each time. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-12-01 05:06:52 +00:00
else
XA_BUG_ON(xa, entry != NULL);
} while (i > 0);
xas_set(&xas, ULONG_MAX);
XA_BUG_ON(xa, xas_next(&xas) != NULL);
XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
XA_BUG_ON(xa, xas_next(&xas) != xa_mk_value(0));
XA_BUG_ON(xa, xas.xa_index != 0);
XA_BUG_ON(xa, xas_prev(&xas) != NULL);
XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
rcu_read_unlock();
xa_erase_index(xa, 0);
xa_erase_index(xa, idx);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_move(struct xarray *xa)
{
XA_STATE(xas, xa, (1 << 16) - 1);
unsigned long i;
for (i = 0; i < (1 << 16); i++)
XA_BUG_ON(xa, xa_store_index(xa, i, GFP_KERNEL) != NULL);
rcu_read_lock();
do {
void *entry = xas_prev(&xas);
i--;
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, entry != xa_mk_index(i));
xarray: Step through an XArray The xas_next and xas_prev functions move the xas index by one position, and adjust the rest of the iterator state to match it. This is more efficient than calling xas_set() as it keeps the iterator at the leaves of the tree instead of walking the iterator from the root each time. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-12-01 05:06:52 +00:00
XA_BUG_ON(xa, i != xas.xa_index);
} while (i != 0);
XA_BUG_ON(xa, xas_prev(&xas) != NULL);
XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
do {
void *entry = xas_next(&xas);
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, entry != xa_mk_index(i));
xarray: Step through an XArray The xas_next and xas_prev functions move the xas index by one position, and adjust the rest of the iterator state to match it. This is more efficient than calling xas_set() as it keeps the iterator at the leaves of the tree instead of walking the iterator from the root each time. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-12-01 05:06:52 +00:00
XA_BUG_ON(xa, i != xas.xa_index);
i++;
} while (i < (1 << 16));
rcu_read_unlock();
for (i = (1 << 8); i < (1 << 15); i++)
xa_erase_index(xa, i);
i = xas.xa_index;
rcu_read_lock();
do {
void *entry = xas_prev(&xas);
i--;
if ((i < (1 << 8)) || (i >= (1 << 15)))
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, entry != xa_mk_index(i));
xarray: Step through an XArray The xas_next and xas_prev functions move the xas index by one position, and adjust the rest of the iterator state to match it. This is more efficient than calling xas_set() as it keeps the iterator at the leaves of the tree instead of walking the iterator from the root each time. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-12-01 05:06:52 +00:00
else
XA_BUG_ON(xa, entry != NULL);
XA_BUG_ON(xa, i != xas.xa_index);
} while (i != 0);
XA_BUG_ON(xa, xas_prev(&xas) != NULL);
XA_BUG_ON(xa, xas.xa_index != ULONG_MAX);
do {
void *entry = xas_next(&xas);
if ((i < (1 << 8)) || (i >= (1 << 15)))
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, entry != xa_mk_index(i));
xarray: Step through an XArray The xas_next and xas_prev functions move the xas index by one position, and adjust the rest of the iterator state to match it. This is more efficient than calling xas_set() as it keeps the iterator at the leaves of the tree instead of walking the iterator from the root each time. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-12-01 05:06:52 +00:00
else
XA_BUG_ON(xa, entry != NULL);
XA_BUG_ON(xa, i != xas.xa_index);
i++;
} while (i < (1 << 16));
rcu_read_unlock();
xa_destroy(xa);
for (i = 0; i < 16; i++)
check_move_small(xa, 1UL << i);
for (i = 2; i < 16; i++)
check_move_small(xa, (1UL << i) - 1);
}
xarray: Add xas_create_range This hopefully temporary function is useful for users who have not yet been converted to multi-index entries. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-12-04 05:11:48 +00:00
static noinline void xa_store_many_order(struct xarray *xa,
unsigned long index, unsigned order)
{
XA_STATE_ORDER(xas, xa, index, order);
unsigned int i = 0;
do {
xas_lock(&xas);
XA_BUG_ON(xa, xas_find_conflict(&xas));
xas_create_range(&xas);
if (xas_error(&xas))
goto unlock;
for (i = 0; i < (1U << order); i++) {
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, xas_store(&xas, xa_mk_index(index + i)));
xarray: Add xas_create_range This hopefully temporary function is useful for users who have not yet been converted to multi-index entries. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-12-04 05:11:48 +00:00
xas_next(&xas);
}
unlock:
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
XA_BUG_ON(xa, xas_error(&xas));
}
static noinline void check_create_range_1(struct xarray *xa,
unsigned long index, unsigned order)
{
unsigned long i;
xa_store_many_order(xa, index, order);
for (i = index; i < index + (1UL << order); i++)
xa_erase_index(xa, i);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_create_range_2(struct xarray *xa, unsigned order)
{
unsigned long i;
unsigned long nr = 1UL << order;
for (i = 0; i < nr * nr; i += nr)
xa_store_many_order(xa, i, order);
for (i = 0; i < nr * nr; i++)
xa_erase_index(xa, i);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_create_range_3(void)
{
XA_STATE(xas, NULL, 0);
xas_set_err(&xas, -EEXIST);
xas_create_range(&xas);
XA_BUG_ON(NULL, xas_error(&xas) != -EEXIST);
}
static noinline void check_create_range_4(struct xarray *xa,
unsigned long index, unsigned order)
{
XA_STATE_ORDER(xas, xa, index, order);
unsigned long base = xas.xa_index;
unsigned long i = 0;
xa_store_index(xa, index, GFP_KERNEL);
do {
xas_lock(&xas);
xas_create_range(&xas);
if (xas_error(&xas))
goto unlock;
for (i = 0; i < (1UL << order); i++) {
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
void *old = xas_store(&xas, xa_mk_index(base + i));
xarray: Add xas_create_range This hopefully temporary function is useful for users who have not yet been converted to multi-index entries. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-12-04 05:11:48 +00:00
if (xas.xa_index == index)
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, old != xa_mk_index(base + i));
xarray: Add xas_create_range This hopefully temporary function is useful for users who have not yet been converted to multi-index entries. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-12-04 05:11:48 +00:00
else
XA_BUG_ON(xa, old != NULL);
xas_next(&xas);
}
unlock:
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
XA_BUG_ON(xa, xas_error(&xas));
for (i = base; i < base + (1UL << order); i++)
xa_erase_index(xa, i);
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_create_range(struct xarray *xa)
{
unsigned int order;
unsigned int max_order = IS_ENABLED(CONFIG_XARRAY_MULTI) ? 12 : 1;
for (order = 0; order < max_order; order++) {
check_create_range_1(xa, 0, order);
check_create_range_1(xa, 1U << order, order);
check_create_range_1(xa, 2U << order, order);
check_create_range_1(xa, 3U << order, order);
check_create_range_1(xa, 1U << 24, order);
if (order < 10)
check_create_range_2(xa, order);
check_create_range_4(xa, 0, order);
check_create_range_4(xa, 1U << order, order);
check_create_range_4(xa, 2U << order, order);
check_create_range_4(xa, 3U << order, order);
check_create_range_4(xa, 1U << 24, order);
check_create_range_4(xa, 1, order);
check_create_range_4(xa, (1U << order) + 1, order);
check_create_range_4(xa, (2U << order) + 1, order);
check_create_range_4(xa, (2U << order) - 1, order);
check_create_range_4(xa, (3U << order) + 1, order);
check_create_range_4(xa, (3U << order) - 1, order);
check_create_range_4(xa, (1U << 24) + 1, order);
}
check_create_range_3();
}
xarray: Add range store functionality This version of xa_store_range() really only supports load and store. Our only user only needs basic load and store functionality, so there's no need to do the extra work to support marking and overlapping stores correctly yet. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-15 18:13:29 +00:00
static noinline void __check_store_range(struct xarray *xa, unsigned long first,
unsigned long last)
{
#ifdef CONFIG_XARRAY_MULTI
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
xa_store_range(xa, first, last, xa_mk_index(first), GFP_KERNEL);
xarray: Add range store functionality This version of xa_store_range() really only supports load and store. Our only user only needs basic load and store functionality, so there's no need to do the extra work to support marking and overlapping stores correctly yet. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-15 18:13:29 +00:00
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
XA_BUG_ON(xa, xa_load(xa, first) != xa_mk_index(first));
XA_BUG_ON(xa, xa_load(xa, last) != xa_mk_index(first));
xarray: Add range store functionality This version of xa_store_range() really only supports load and store. Our only user only needs basic load and store functionality, so there's no need to do the extra work to support marking and overlapping stores correctly yet. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-15 18:13:29 +00:00
XA_BUG_ON(xa, xa_load(xa, first - 1) != NULL);
XA_BUG_ON(xa, xa_load(xa, last + 1) != NULL);
xa_store_range(xa, first, last, NULL, GFP_KERNEL);
#endif
XA_BUG_ON(xa, !xa_empty(xa));
}
static noinline void check_store_range(struct xarray *xa)
{
unsigned long i, j;
for (i = 0; i < 128; i++) {
for (j = i; j < 128; j++) {
__check_store_range(xa, i, j);
__check_store_range(xa, 128 + i, 128 + j);
__check_store_range(xa, 4095 + i, 4095 + j);
__check_store_range(xa, 4096 + i, 4096 + j);
__check_store_range(xa, 123456 + i, 123456 + j);
XArray tests: Correct some 64-bit assumptions The test-suite caught these two mistakes when compiled for 32-bit. I had only been running the test-suite in 64-bit mode. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 14:34:04 +00:00
__check_store_range(xa, (1 << 24) + i, (1 << 24) + j);
xarray: Add range store functionality This version of xa_store_range() really only supports load and store. Our only user only needs basic load and store functionality, so there's no need to do the extra work to support marking and overlapping stores correctly yet. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-15 18:13:29 +00:00
}
}
}
XArray: Permit storing 2-byte-aligned pointers On m68k, statically allocated pointers may only be two-byte aligned. This clashes with the XArray's method for tagging internal pointers. Permit storing these pointers in single slots (ie not in multislots). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-12-29 04:20:44 +00:00
static void check_align_1(struct xarray *xa, char *name)
{
int i;
unsigned int id;
unsigned long index;
void *entry;
for (i = 0; i < 8; i++) {
id = 0;
XA_BUG_ON(xa, xa_alloc(xa, &id, UINT_MAX, name + i, GFP_KERNEL)
!= 0);
XA_BUG_ON(xa, id != i);
}
xa_for_each(xa, index, entry)
XA_BUG_ON(xa, xa_is_err(entry));
xa_destroy(xa);
}
static noinline void check_align(struct xarray *xa)
{
char name[] = "Motorola 68000";
check_align_1(xa, name);
check_align_1(xa, name + 1);
check_align_1(xa, name + 2);
check_align_1(xa, name + 3);
// check_align_2(xa, name);
}
mm: Convert workingset to XArray We construct an XA_STATE and use it to delete the node with xas_store() rather than adding a special function for this unique use case. Includes a test that simulates this usage for the test suite. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-24 19:24:59 +00:00
static LIST_HEAD(shadow_nodes);
static void test_update_node(struct xa_node *node)
{
if (node->count && node->count == node->nr_values) {
if (list_empty(&node->private_list))
list_add(&shadow_nodes, &node->private_list);
} else {
if (!list_empty(&node->private_list))
list_del_init(&node->private_list);
}
}
static noinline void shadow_remove(struct xarray *xa)
{
struct xa_node *node;
xa_lock(xa);
while ((node = list_first_entry_or_null(&shadow_nodes,
struct xa_node, private_list))) {
XA_STATE(xas, node->array, 0);
XA_BUG_ON(xa, node->array != xa);
list_del_init(&node->private_list);
xas.xa_node = xa_parent_locked(node->array, node);
xas.xa_offset = node->offset;
xas.xa_shift = node->shift + XA_CHUNK_SHIFT;
xas_set_update(&xas, test_update_node);
xas_store(&xas, NULL);
}
xa_unlock(xa);
}
static noinline void check_workingset(struct xarray *xa, unsigned long index)
{
XA_STATE(xas, xa, index);
xas_set_update(&xas, test_update_node);
do {
xas_lock(&xas);
xas_store(&xas, xa_mk_value(0));
xas_next(&xas);
xas_store(&xas, xa_mk_value(1));
xas_unlock(&xas);
} while (xas_nomem(&xas, GFP_KERNEL));
XA_BUG_ON(xa, list_empty(&shadow_nodes));
xas_lock(&xas);
xas_next(&xas);
xas_store(&xas, &xas);
XA_BUG_ON(xa, !list_empty(&shadow_nodes));
xas_store(&xas, xa_mk_value(2));
xas_unlock(&xas);
XA_BUG_ON(xa, list_empty(&shadow_nodes));
shadow_remove(xa);
XA_BUG_ON(xa, !list_empty(&shadow_nodes));
XA_BUG_ON(xa, !xa_empty(xa));
}
xarray: Move multiorder account test in-kernel Move this test to the in-kernel test suite, and enhance it to test several different orders. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-28 20:13:16 +00:00
/*
* Check that the pointer / value / sibling entries are accounted the
* way we expect them to be.
*/
static noinline void check_account(struct xarray *xa)
{
#ifdef CONFIG_XARRAY_MULTI
unsigned int order;
for (order = 1; order < 12; order++) {
XA_STATE(xas, xa, 1 << order);
xa_store_order(xa, 0, order, xa, GFP_KERNEL);
XArray tests: Add missing locking Lockdep caught me being sloppy in the test suite and failing to lock the XArray appropriately. Reported-by: kernel test robot <rong.a.chen@intel.com> Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-19 14:36:29 +00:00
rcu_read_lock();
xarray: Move multiorder account test in-kernel Move this test to the in-kernel test suite, and enhance it to test several different orders. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-28 20:13:16 +00:00
xas_load(&xas);
XA_BUG_ON(xa, xas.xa_node->count == 0);
XA_BUG_ON(xa, xas.xa_node->count > (1 << order));
XA_BUG_ON(xa, xas.xa_node->nr_values != 0);
XArray tests: Add missing locking Lockdep caught me being sloppy in the test suite and failing to lock the XArray appropriately. Reported-by: kernel test robot <rong.a.chen@intel.com> Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-19 14:36:29 +00:00
rcu_read_unlock();
xarray: Move multiorder account test in-kernel Move this test to the in-kernel test suite, and enhance it to test several different orders. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-28 20:13:16 +00:00
XArray tests: Handle larger indices more elegantly xa_mk_value() only handles values up to LONG_MAX. I successfully hid that inside xa_store_index() and xa_erase_index(), but it turned out I also needed it for testing xa_alloc() on 32-bit machines. So extract xa_mk_index() from the above two functions, and convert the non-constant users of xa_mk_value() to xa_mk_index(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-11-05 18:19:54 +00:00
xa_store_order(xa, 1 << order, order, xa_mk_index(1UL << order),
xarray: Move multiorder account test in-kernel Move this test to the in-kernel test suite, and enhance it to test several different orders. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-28 20:13:16 +00:00
GFP_KERNEL);
XA_BUG_ON(xa, xas.xa_node->count != xas.xa_node->nr_values * 2);
xa_erase(xa, 1 << order);
XA_BUG_ON(xa, xas.xa_node->nr_values != 0);
xa_erase(xa, 0);
XA_BUG_ON(xa, !xa_empty(xa));
}
#endif
}
xarray: Destroy an XArray This function frees all the internal memory allocated to the xarray and reinitialises it to be empty. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-17 13:16:34 +00:00
static noinline void check_destroy(struct xarray *xa)
{
unsigned long index;
XA_BUG_ON(xa, !xa_empty(xa));
/* Destroying an empty array is a no-op */
xa_destroy(xa);
XA_BUG_ON(xa, !xa_empty(xa));
/* Destroying an array with a single entry */
for (index = 0; index < 1000; index++) {
xa_store_index(xa, index, GFP_KERNEL);
XA_BUG_ON(xa, xa_empty(xa));
xa_destroy(xa);
XA_BUG_ON(xa, !xa_empty(xa));
}
/* Destroying an array with a single entry at ULONG_MAX */
xa_store(xa, ULONG_MAX, xa, GFP_KERNEL);
XA_BUG_ON(xa, xa_empty(xa));
xa_destroy(xa);
XA_BUG_ON(xa, !xa_empty(xa));
#ifdef CONFIG_XARRAY_MULTI
/* Destroying an array with a multi-index entry */
xa_store_order(xa, 1 << 11, 11, xa, GFP_KERNEL);
XA_BUG_ON(xa, xa_empty(xa));
xa_destroy(xa);
XA_BUG_ON(xa, !xa_empty(xa));
#endif
}
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
static DEFINE_XARRAY(array);
xarray: Add XArray load operation The xa_load function brings with it a lot of infrastructure; xa_empty(), xa_is_err(), and large chunks of the XArray advanced API that are used to implement xa_load. As the test-suite demonstrates, it is possible to use the XArray functions on a radix tree. The radix tree functions depend on the GFP flags being stored in the root of the tree, so it's not possible to use the radix tree functions on an XArray. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-07 19:57:46 +00:00
static int xarray_checks(void)
{
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
check_xa_err(&array);
xarray: Add XArray iterators The xa_for_each iterator allows the user to efficiently walk a range of the array, executing the loop body once for each entry in that range that matches the filter. This commit also includes xa_find() and xa_find_after() which are helper functions for xa_for_each() but may also be useful in their own right. In the xas family of functions, we have xas_for_each(), xas_find(), xas_next_entry(), xas_for_each_tagged(), xas_find_tagged(), xas_next_tagged() and xas_pause(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-14 13:30:11 +00:00
check_xas_retry(&array);
xarray: Add XArray load operation The xa_load function brings with it a lot of infrastructure; xa_empty(), xa_is_err(), and large chunks of the XArray advanced API that are used to implement xa_load. As the test-suite demonstrates, it is possible to use the XArray functions on a radix tree. The radix tree functions depend on the GFP flags being stored in the root of the tree, so it's not possible to use the radix tree functions on an XArray. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-07 19:57:46 +00:00
check_xa_load(&array);
xarray: Add XArray marks XArray marks are like the radix tree tags, only slightly more strongly typed. They are renamed in order to distinguish them from tagged pointers. This commit adds the basic get/set/clear operations. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 14:34:31 +00:00
check_xa_mark(&array);
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
check_xa_shrink(&array);
xarray: Add XArray iterators The xa_for_each iterator allows the user to efficiently walk a range of the array, executing the loop body once for each entry in that range that matches the filter. This commit also includes xa_find() and xa_find_after() which are helper functions for xa_for_each() but may also be useful in their own right. In the xas family of functions, we have xas_for_each(), xas_find(), xas_next_entry(), xas_for_each_tagged(), xas_find_tagged(), xas_next_tagged() and xas_pause(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-14 13:30:11 +00:00
check_xas_erase(&array);
xarray: Add XArray conditional store operations Like cmpxchg(), xa_cmpxchg will only store to the index if the current entry matches the old entry. It returns the current entry, which is usually more useful than the errno returned by radix_tree_insert(). For the users who really only want the errno, the xa_insert() wrapper provides a more convenient calling convention. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:34:55 +00:00
check_cmpxchg(&array);
xarray: Add xa_reserve and xa_release This function reserves a slot in the XArray for users which need to acquire multiple locks before storing their entry in the tree and so cannot use a plain xa_store(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-10-01 18:54:59 +00:00
check_reserve(&array);
xarray: Add XArray unconditional store operations xa_store() differs from radix_tree_insert() in that it will overwrite an existing element in the array rather than returning an error. This is the behaviour which most users want, and those that want more complex behaviour generally want to use the xas family of routines anyway. For memory allocation, xa_store() will first attempt to request memory from the slab allocator; if memory is not immediately available, it will drop the xa_lock and allocate memory, keeping a pointer in the xa_state. It does not use the per-CPU cache, although those will continue to exist until all radix tree users are converted to the xarray. This patch also includes xa_erase() and __xa_erase() for a streamlined way to store NULL. Since there is no need to allocate memory in order to store a NULL in the XArray, we do not need to trouble the user with deciding what memory allocation flags to use. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-10 20:15:08 +00:00
check_multi_store(&array);
xarray: Track free entries in an XArray Add the optional ability to track which entries in an XArray are free and provide xa_alloc() to replace most of the functionality of the IDR. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-07-04 14:50:12 +00:00
check_xa_alloc();
xarray: Add XArray iterators The xa_for_each iterator allows the user to efficiently walk a range of the array, executing the loop body once for each entry in that range that matches the filter. This commit also includes xa_find() and xa_find_after() which are helper functions for xa_for_each() but may also be useful in their own right. In the xas family of functions, we have xas_for_each(), xas_find(), xas_next_entry(), xas_for_each_tagged(), xas_find_tagged(), xas_next_tagged() and xas_pause(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-14 13:30:11 +00:00
check_find(&array);
shmem: Convert find_swap_entry to XArray This is a 1:1 conversion. The major part of this patch is converting the test framework from userspace to kernel space and mirroring the algorithm now used in find_swap_entry(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-22 13:36:00 +00:00
check_find_entry(&array);
xarray: Move multiorder account test in-kernel Move this test to the in-kernel test suite, and enhance it to test several different orders. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-28 20:13:16 +00:00
check_account(&array);
xarray: Destroy an XArray This function frees all the internal memory allocated to the xarray and reinitialises it to be empty. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-17 13:16:34 +00:00
check_destroy(&array);
xarray: Step through an XArray The xas_next and xas_prev functions move the xas index by one position, and adjust the rest of the iterator state to match it. This is more efficient than calling xas_set() as it keeps the iterator at the leaves of the tree instead of walking the iterator from the root each time. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-12-01 05:06:52 +00:00
check_move(&array);
xarray: Add xas_create_range This hopefully temporary function is useful for users who have not yet been converted to multi-index entries. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-12-04 05:11:48 +00:00
check_create_range(&array);
xarray: Add range store functionality This version of xa_store_range() really only supports load and store. Our only user only needs basic load and store functionality, so there's no need to do the extra work to support marking and overlapping stores correctly yet. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-08-15 18:13:29 +00:00
check_store_range(&array);
xarray: Add xas_for_each_conflict This iterator iterates over each entry that is stored in the index or indices specified by the xa_state. This is intended for use for a conditional store of a multiindex entry, or to allow entries which are about to be removed from the xarray to be disposed of properly. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-06-02 02:46:02 +00:00
check_store_iter(&array);
XArray: Permit storing 2-byte-aligned pointers On m68k, statically allocated pointers may only be two-byte aligned. This clashes with the XArray's method for tagging internal pointers. Permit storing these pointers in single slots (ie not in multislots). Signed-off-by: Matthew Wilcox <willy@infradead.org>
2018-12-29 04:20:44 +00:00
check_align(&xa0);
xarray: Add XArray load operation The xa_load function brings with it a lot of infrastructure; xa_empty(), xa_is_err(), and large chunks of the XArray advanced API that are used to implement xa_load. As the test-suite demonstrates, it is possible to use the XArray functions on a radix tree. The radix tree functions depend on the GFP flags being stored in the root of the tree, so it's not possible to use the radix tree functions on an XArray. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-07 19:57:46 +00:00
mm: Convert workingset to XArray We construct an XA_STATE and use it to delete the node with xas_store() rather than adding a special function for this unique use case. Includes a test that simulates this usage for the test suite. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-24 19:24:59 +00:00
check_workingset(&array, 0);
check_workingset(&array, 64);
check_workingset(&array, 4096);
xarray: Add XArray load operation The xa_load function brings with it a lot of infrastructure; xa_empty(), xa_is_err(), and large chunks of the XArray advanced API that are used to implement xa_load. As the test-suite demonstrates, it is possible to use the XArray functions on a radix tree. The radix tree functions depend on the GFP flags being stored in the root of the tree, so it's not possible to use the radix tree functions on an XArray. Signed-off-by: Matthew Wilcox <willy@infradead.org>
2017-11-07 19:57:46 +00:00
printk("XArray: %u of %u tests passed\n", tests_passed, tests_run);
return (tests_run == tests_passed) ? 0 : -EINVAL;
}
static void xarray_exit(void)
{
}
module_init(xarray_checks);
module_exit(xarray_exit);
MODULE_AUTHOR("Matthew Wilcox <willy@infradead.org>");
MODULE_LICENSE("GPL");
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