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* Merge tag 'xarray-5.9' of git://git.infradead.org/users/willy/xarrayLinus Torvalds2020-10-201-6/+26
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull XArray updates from Matthew Wilcox: - Fix the test suite after introduction of the local_lock - Fix a bug in the IDA spotted by Coverity - Change the API that allows the workingset code to delete a node - Fix xas_reload() when dealing with entries that occupy multiple indices - Add a few more tests to the test suite - Fix an unsigned int being shifted into an unsigned long * tag 'xarray-5.9' of git://git.infradead.org/users/willy/xarray: XArray: Fix xas_create_range for ranges above 4 billion radix-tree: fix the comment of radix_tree_next_slot() XArray: Fix xas_reload for multi-index entries XArray: Add private interface for workingset node deletion XArray: Fix xas_for_each_conflict documentation XArray: Test marked multiorder iterations XArray: Test two more things about xa_cmpxchg ida: Free allocated bitmap in error path radix tree test suite: Fix compilation
| * XArray: Add private interface for workingset node deletionMatthew Wilcox (Oracle)2020-10-131-6/+1
| | | | | | | | | | | | | | | | Move the tricky bits of dealing with the XArray from the workingset code to the XArray. Make it clear in the documentation that this is a private interface, and only export it for the benefit of the test suite. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
| * XArray: Test marked multiorder iterationsMatthew Wilcox (Oracle)2020-10-081-0/+22
| | | | | | | | | | | | | | Demonstrate that starting a marked iteration partway through a marked multi-order entry works. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
| * XArray: Test two more things about xa_cmpxchgMatthew Wilcox (Oracle)2020-10-071-0/+3
| | | | | | | | | | | | | | 1. If we xa_cmpxchg() an entry in, it marks the index as not free. 2. If we xa_cmpxchg() NULL in, it marks the index as free. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
* | XArray: add xas_splitMatthew Wilcox (Oracle)2020-10-161-0/+44
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In order to use multi-index entries for huge pages in the page cache, we need to be able to split a multi-index entry (eg if a file is truncated in the middle of a huge page entry). This version does not support splitting more than one level of the tree at a time. This is an acceptable limitation for the page cache as we do not expect to support order-12 pages in the near future. [akpm@linux-foundation.org: export xas_split_alloc() to modules] [willy@infradead.org: fix xarray split] Link: https://lkml.kernel.org/r/20200910175450.GV6583@casper.infradead.org [willy@infradead.org: fix xarray] Link: https://lkml.kernel.org/r/20201001233943.GW20115@casper.infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: "Kirill A . Shutemov" <kirill@shutemov.name> Cc: Qian Cai <cai@lca.pw> Cc: Song Liu <songliubraving@fb.com> Link: https://lkml.kernel.org/r/20200903183029.14930-3-willy@infradead.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | XArray: add xa_get_orderMatthew Wilcox (Oracle)2020-10-161-0/+21
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Patch series "Fix read-only THP for non-tmpfs filesystems". As described more verbosely in the [3/3] changelog, we can inadvertently put an order-0 page in the page cache which occupies 512 consecutive entries. Users are running into this if they enable the READ_ONLY_THP_FOR_FS config option; see https://bugzilla.kernel.org/show_bug.cgi?id=206569 and Qian Cai has also reported it here: https://lore.kernel.org/lkml/20200616013309.GB815@lca.pw/ This is a rather intrusive way of fixing the problem, but has the advantage that I've actually been testing it with the THP patches, which means that it sees far more use than it does upstream -- indeed, Song has been entirely unable to reproduce it. It also has the advantage that it removes a few patches from my gargantuan backlog of THP patches. This patch (of 3): This function returns the order of the entry at the index. We need this because there isn't space in the shadow entry to encode its order. [akpm@linux-foundation.org: export xa_get_order to modules] Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: "Kirill A . Shutemov" <kirill@shutemov.name> Cc: Qian Cai <cai@lca.pw> Cc: Song Liu <songliubraving@fb.com> Link: https://lkml.kernel.org/r/20200903183029.14930-1-willy@infradead.org Link: https://lkml.kernel.org/r/20200903183029.14930-2-willy@infradead.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* XArray: Fix xas_pause for large multi-index entriesMatthew Wilcox (Oracle)2020-01-311-0/+37
| | | | | | | | | | | Inspired by the recent Coverity report, I looked for other places where the offset wasn't being converted to an unsigned long before being shifted, and I found one in xas_pause() when the entry being paused is of order >32. Fixes: b803b42823d0 ("xarray: Add XArray iterators") Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: stable@vger.kernel.org
* XArray: Fix xa_find_next for large multi-index entriesMatthew Wilcox (Oracle)2020-01-311-0/+18
| | | | | | | | | | | | | | Coverity pointed out that xas_sibling() was shifting xa_offset without promoting it to an unsigned long first, so the shift could cause an overflow and we'd get the wrong answer. The fix is obvious, and the new test-case provokes UBSAN to report an error: runtime error: shift exponent 60 is too large for 32-bit type 'int' Fixes: 19c30f4dd092 ("XArray: Fix xa_find_after with multi-index entries") Reported-by: Bjorn Helgaas <bhelgaas@google.com> Reported-by: Kees Cook <keescook@chromium.org> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: stable@vger.kernel.org
* XArray: Fix xas_find returning too many entriesMatthew Wilcox (Oracle)2020-01-181-0/+5
| | | | | | | | If you call xas_find() with the initial index > max, it should have returned NULL but was returning the entry at index. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: stable@vger.kernel.org
* XArray: Fix xa_find_after with multi-index entriesMatthew Wilcox (Oracle)2020-01-181-13/+19
| | | | | | | | | | | If the entry is of an order which is a multiple of XA_CHUNK_SIZE, the current detection of sibling entries does not work. Factor out an xas_sibling() function to make xa_find_after() a little more understandable, and write a new implementation that doesn't suffer from the same bug. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: stable@vger.kernel.org
* XArray: Fix infinite loop with entry at ULONG_MAXMatthew Wilcox (Oracle)2020-01-181-0/+17
| | | | | | | | | If there is an entry at ULONG_MAX, xa_for_each() will overflow the 'index + 1' in xa_find_after() and wrap around to 0. Catch this case and terminate the loop by returning NULL. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: stable@vger.kernel.org
* XArray: Fix xas_pause at ULONG_MAXMatthew Wilcox (Oracle)2019-11-091-0/+22
| | | | | | | | | | If we were unlucky enough to call xas_pause() when the index was at ULONG_MAX (or a multi-slot entry which ends at ULONG_MAX), we would wrap the index back around to 0 and restart the iteration from the beginning. Use the XAS_BOUNDS state to indicate that we should just stop the iteration. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
* XArray: Fix xas_next() with a single entry at 0Matthew Wilcox (Oracle)2019-07-011-0/+24
| | | | | | | | | | | If there is only a single entry at 0, the first time we call xas_next(), we return the entry. Unfortunately, all subsequent times we call xas_next(), we also return the entry at 0 instead of noticing that the xa_index is now greater than zero. This broke find_get_pages_contig(). Fixes: 64d3e9a9e0cc ("xarray: Step through an XArray") Reported-by: Kent Overstreet <kent.overstreet@gmail.com> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
* XArray tests: Add check_insertMatthew Wilcox2019-06-031-0/+38
| | | | | | | A simple test which just checks that inserting an entry into an empty array succeeds. Try various different interesting indices. Signed-off-by: Matthew Wilcox <willy@infradead.org>
* XArray: Fix xa_reserve for 2-byte aligned entriesMatthew Wilcox2019-02-211-0/+10
| | | | | | | | If we reserve index 0, the next entry to be stored there might be 2-byte aligned. That means we have to create the root xa_node at the time of reserving the initial entry. Signed-off-by: Matthew Wilcox <willy@infradead.org>
* XArray: Fix xa_erase of 2-byte aligned entriesMatthew Wilcox2019-02-211-1/+15
| | | | | | | | xas_store() was interpreting the entry it found in the array as a node entry if the bottom two bits had value 2. That's only true if either the entry is in the root node or in a non-leaf node. Signed-off-by: Matthew Wilcox <willy@infradead.org>
* XArray: Fix xa_release in allocating arraysMatthew Wilcox2019-02-201-4/+24
| | | | | | | | | | | | | | xa_cmpxchg() was a little too magic in turning ZERO entries into NULL, and would leave the entry set to the ZERO entry instead of releasing it for future use. After careful review of existing users of xa_cmpxchg(), change the semantics so that it does not translate either incoming argument from NULL into ZERO entries. Add several tests to the test-suite to make sure this problem doesn't come back. Reported-by: Jason Gunthorpe <jgg@ziepe.ca> Signed-off-by: Matthew Wilcox <willy@infradead.org>
* XArray: Mark xa_insert and xa_reserve as must_checkMatthew Wilcox2019-02-091-5/+5
| | | | | | | | | If the user doesn't care about the return value from xa_insert(), then they should be using xa_store() instead. The point of xa_reserve() is to get the return value early before taking another lock, so this should also be __must_check. Signed-off-by: Matthew Wilcox <willy@infradead.org>
* XArray: Add cyclic allocationMatthew Wilcox2019-02-061-0/+53
| | | | | | | | | | | | | | | | | | This differs slightly from the IDR equivalent in five ways. 1. It can allocate up to UINT_MAX instead of being limited to INT_MAX, like xa_alloc(). Also like xa_alloc(), it will write to the 'id' pointer before placing the entry in the XArray. 2. The 'next' cursor is allocated separately from the XArray instead of being part of the IDR. This saves memory for all the users which do not use the cyclic allocation API and suits some users better. 3. It returns -EBUSY instead of -ENOSPC. 4. It will attempt to wrap back to the minimum value on memory allocation failure as well as on an -EBUSY error, assuming that a user would rather allocate a small ID than suffer an ID allocation failure. 5. It reports whether it has wrapped, which is important to some users. Signed-off-by: Matthew Wilcox <willy@infradead.org>
* XArray: Redesign xa_alloc APIMatthew Wilcox2019-02-061-16/+70
| | | | | | | | | | It was too easy to forget to initialise the start index. Add an xa_limit data structure which can be used to pass min & max, and define a couple of special values for common cases. Also add some more tests cribbed from the IDR test suite. Change the return value from -ENOSPC to -EBUSY to match xa_insert(). Signed-off-by: Matthew Wilcox <willy@infradead.org>
* XArray: Add support for 1s-based allocationMatthew Wilcox2019-02-061-33/+55
| | | | | | | | | | | A lot of places want to allocate IDs starting at 1 instead of 0. While the xa_alloc() API supports this, it's not very efficient if lots of IDs are allocated, due to having to walk down to the bottom of the tree to see if ID 1 is available, then all the way over to the next non-allocated ID. This method marks ID 0 as being occupied which wastes one slot in the XArray, but preserves xa_empty() as working. Signed-off-by: Matthew Wilcox <willy@infradead.org>
* XArray: Change xa_insert to return -EBUSYMatthew Wilcox2019-02-061-2/+2
| | | | | | | | Userspace translates EEXIST to "File exists" which isn't a very good error message for the problem. "Device or resource busy" is a better indication of what went wrong. Signed-off-by: Matthew Wilcox <willy@infradead.org>
* XArray tests: RCU lock prohibits GFP_KERNELMatthew Wilcox2019-02-051-0/+3
| | | | | | | Drop and reacquire the RCU read lock while using GFP_KERNEL. Reported-by: Li RongQing <lirongqing@baidu.com> Signed-off-by: Matthew Wilcox <willy@infradead.org>
* XArray tests: Check mark 2 gets squashedMatthew Wilcox2019-01-141-3/+3
| | | | | | | | | | 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>
* XArray: Honour reserved entries in xa_insertMatthew Wilcox2019-01-071-3/+5
| | | | | | | | | 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>
* XArray: Permit storing 2-byte-aligned pointersMatthew Wilcox2019-01-071-0/+30
| | | | | | | | 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>
* XArray: Change xa_for_each iteratorMatthew Wilcox2019-01-071-6/+5
| | | | | | | | | | | | | | | | | | 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>
* XArray tests: Add RCU lockingMatthew Wilcox2019-01-071-0/+2
| | | | | | 0day picked up that I'd forgotten to add locking to this new test. Signed-off-by: Matthew Wilcox <willy@infradead.org>
* XArray: Fix xa_alloc when id exceeds maxMatthew Wilcox2018-12-131-0/+33
| | | | | | | | | | 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>
* XArray tests: Check iterating over multiorder entriesMatthew Wilcox2018-12-061-0/+31
| | | | | | There was no bug here, but there was no test coverage for this scenario. Signed-off-by: Matthew Wilcox <willy@infradead.org>
* XArray tests: Handle larger indices more elegantlyMatthew Wilcox2018-12-061-43/+48
| | | | | | | | | | 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>
* XArray tests: Add missing lockingMatthew Wilcox2018-11-191-0/+10
| | | | | | | | 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>
* XArray tests: Correct some 64-bit assumptionsMatthew Wilcox2018-11-161-2/+2
| | | | | | | 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>
* XArray: Regularise xa_reserveMatthew Wilcox2018-11-051-0/+6
| | | | | | | | 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>
* XArray: Fix xa_for_each with a single element at 0Matthew Wilcox2018-11-051-1/+29
| | | | | | | | | | | | | | | | 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>
* xarray: Add range store functionalityMatthew Wilcox2018-10-211-0/+34
| | | | | | | | | 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>
* xarray: Move multiorder_check to in-kernel testsMatthew Wilcox2018-10-211-0/+44
| | | | | | | | 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>
* xarray: Move multiorder_shrink to kernel testsMatthew Wilcox2018-10-211-0/+37
| | | | | | | | 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>
* xarray: Move multiorder account test in-kernelMatthew Wilcox2018-10-211-0/+32
| | | | | | | 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>
* radix tree: Remove radix_tree_clear_tagsMatthew Wilcox2018-10-211-0/+40
| | | | | | | | 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>
* shmem: Convert find_swap_entry to XArrayMatthew Wilcox2018-10-211-0/+56
| | | | | | | | 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>
* mm: Convert workingset to XArrayMatthew Wilcox2018-10-211-0/+65
| | | | | | | | | 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>
* xarray: Track free entries in an XArrayMatthew Wilcox2018-10-211-0/+61
| | | | | | | 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>
* xarray: Add xa_reserve and xa_releaseMatthew Wilcox2018-10-211-0/+40
| | | | | | | | 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>
* xarray: Add xas_create_rangeMatthew Wilcox2018-10-211-0/+119
| | | | | | | 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>
* xarray: Add xas_for_each_conflictMatthew Wilcox2018-10-211-0/+68
| | | | | | | | | 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>
* xarray: Step through an XArrayMatthew Wilcox2018-10-211-0/+115
| | | | | | | | | 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>
* xarray: Destroy an XArrayMatthew Wilcox2018-10-211-0/+34
| | | | | | | 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>
* xarray: Add XArray iteratorsMatthew Wilcox2018-10-211-0/+183
| | | | | | | | | | | | | | 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>
* xarray: Add XArray conditional store operationsMatthew Wilcox2018-10-211-0/+20
| | | | | | | | | | 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>
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