mm: zswap: remove shrink from zpool interface
Now that all three zswap backends have removed their shrink code, it is no longer necessary for the zpool interface to include shrink/writeback endpoints. Link: https://lkml.kernel.org/r/20230612093815.133504-6-cerasuolodomenico@gmail.com Signed-off-by: Domenico Cerasuolo <cerasuolodomenico@gmail.com> Reviewed-by: Yosry Ahmed <yosryahmed@google.com> Acked-by: Nhat Pham <nphamcs@gmail.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Dan Streetman <ddstreet@ieee.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Seth Jennings <sjenning@redhat.com> Cc: Vitaly Wool <vitaly.wool@konsulko.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -14,10 +14,6 @@
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struct zpool;
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struct zpool_ops {
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int (*evict)(struct zpool *pool, unsigned long handle);
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};
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/*
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* Control how a handle is mapped. It will be ignored if the
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* implementation does not support it. Its use is optional.
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@ -39,8 +35,7 @@ enum zpool_mapmode {
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bool zpool_has_pool(char *type);
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struct zpool *zpool_create_pool(const char *type, const char *name,
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gfp_t gfp, const struct zpool_ops *ops);
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struct zpool *zpool_create_pool(const char *type, const char *name, gfp_t gfp);
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const char *zpool_get_type(struct zpool *pool);
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@ -53,9 +48,6 @@ int zpool_malloc(struct zpool *pool, size_t size, gfp_t gfp,
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void zpool_free(struct zpool *pool, unsigned long handle);
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int zpool_shrink(struct zpool *pool, unsigned int pages,
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unsigned int *reclaimed);
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void *zpool_map_handle(struct zpool *pool, unsigned long handle,
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enum zpool_mapmode mm);
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@ -72,7 +64,6 @@ u64 zpool_get_total_size(struct zpool *pool);
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* @destroy: destroy a pool.
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* @malloc: allocate mem from a pool.
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* @free: free mem from a pool.
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* @shrink: shrink the pool.
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* @sleep_mapped: whether zpool driver can sleep during map.
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* @map: map a handle.
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* @unmap: unmap a handle.
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@ -87,10 +78,7 @@ struct zpool_driver {
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atomic_t refcount;
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struct list_head list;
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void *(*create)(const char *name,
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gfp_t gfp,
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const struct zpool_ops *ops,
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struct zpool *zpool);
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void *(*create)(const char *name, gfp_t gfp);
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void (*destroy)(void *pool);
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bool malloc_support_movable;
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@ -98,9 +86,6 @@ struct zpool_driver {
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unsigned long *handle);
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void (*free)(void *pool, unsigned long handle);
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int (*shrink)(void *pool, unsigned int pages,
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unsigned int *reclaimed);
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bool sleep_mapped;
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void *(*map)(void *pool, unsigned long handle,
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enum zpool_mapmode mm);
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@ -113,7 +98,6 @@ void zpool_register_driver(struct zpool_driver *driver);
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int zpool_unregister_driver(struct zpool_driver *driver);
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bool zpool_evictable(struct zpool *pool);
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bool zpool_can_sleep_mapped(struct zpool *pool);
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#endif
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@ -1364,9 +1364,7 @@ static const struct movable_operations z3fold_mops = {
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* zpool
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****************/
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static void *z3fold_zpool_create(const char *name, gfp_t gfp,
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const struct zpool_ops *zpool_ops,
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struct zpool *zpool)
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static void *z3fold_zpool_create(const char *name, gfp_t gfp)
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{
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return z3fold_create_pool(name, gfp);
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}
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@ -380,9 +380,7 @@ static u64 zbud_get_pool_size(struct zbud_pool *pool)
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* zpool
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****************/
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static void *zbud_zpool_create(const char *name, gfp_t gfp,
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const struct zpool_ops *zpool_ops,
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struct zpool *zpool)
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static void *zbud_zpool_create(const char *name, gfp_t gfp)
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{
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return zbud_create_pool(gfp);
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}
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48
mm/zpool.c
48
mm/zpool.c
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@ -133,7 +133,6 @@ EXPORT_SYMBOL(zpool_has_pool);
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* @type: The type of the zpool to create (e.g. zbud, zsmalloc)
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* @name: The name of the zpool (e.g. zram0, zswap)
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* @gfp: The GFP flags to use when allocating the pool.
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* @ops: The optional ops callback.
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*
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* This creates a new zpool of the specified type. The gfp flags will be
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* used when allocating memory, if the implementation supports it. If the
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@ -145,8 +144,7 @@ EXPORT_SYMBOL(zpool_has_pool);
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*
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* Returns: New zpool on success, NULL on failure.
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*/
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struct zpool *zpool_create_pool(const char *type, const char *name, gfp_t gfp,
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const struct zpool_ops *ops)
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struct zpool *zpool_create_pool(const char *type, const char *name, gfp_t gfp)
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{
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struct zpool_driver *driver;
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struct zpool *zpool;
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@ -173,7 +171,7 @@ struct zpool *zpool_create_pool(const char *type, const char *name, gfp_t gfp,
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}
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zpool->driver = driver;
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zpool->pool = driver->create(name, gfp, ops, zpool);
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zpool->pool = driver->create(name, gfp);
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if (!zpool->pool) {
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pr_err("couldn't create %s pool\n", type);
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@ -279,30 +277,6 @@ void zpool_free(struct zpool *zpool, unsigned long handle)
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zpool->driver->free(zpool->pool, handle);
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}
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/**
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* zpool_shrink() - Shrink the pool size
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* @zpool: The zpool to shrink.
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* @pages: The number of pages to shrink the pool.
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* @reclaimed: The number of pages successfully evicted.
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*
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* This attempts to shrink the actual memory size of the pool
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* by evicting currently used handle(s). If the pool was
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* created with no zpool_ops, or the evict call fails for any
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* of the handles, this will fail. If non-NULL, the @reclaimed
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* parameter will be set to the number of pages reclaimed,
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* which may be more than the number of pages requested.
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*
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* Implementations must guarantee this to be thread-safe.
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*
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* Returns: 0 on success, negative value on error/failure.
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*/
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int zpool_shrink(struct zpool *zpool, unsigned int pages,
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unsigned int *reclaimed)
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{
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return zpool->driver->shrink ?
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zpool->driver->shrink(zpool->pool, pages, reclaimed) : -EINVAL;
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}
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/**
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* zpool_map_handle() - Map a previously allocated handle into memory
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* @zpool: The zpool that the handle was allocated from
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@ -359,24 +333,6 @@ u64 zpool_get_total_size(struct zpool *zpool)
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return zpool->driver->total_size(zpool->pool);
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}
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/**
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* zpool_evictable() - Test if zpool is potentially evictable
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* @zpool: The zpool to test
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*
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* Zpool is only potentially evictable when it's created with struct
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* zpool_ops.evict and its driver implements struct zpool_driver.shrink.
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*
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* However, it doesn't necessarily mean driver will use zpool_ops.evict
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* in its implementation of zpool_driver.shrink. It could do internal
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* defragmentation instead.
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*
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* Returns: true if potentially evictable; false otherwise.
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*/
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bool zpool_evictable(struct zpool *zpool)
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{
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return zpool->driver->shrink;
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}
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/**
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* zpool_can_sleep_mapped - Test if zpool can sleep when do mapped.
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* @zpool: The zpool to test
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@ -351,9 +351,7 @@ static void record_obj(unsigned long handle, unsigned long obj)
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#ifdef CONFIG_ZPOOL
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static void *zs_zpool_create(const char *name, gfp_t gfp,
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const struct zpool_ops *zpool_ops,
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struct zpool *zpool)
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static void *zs_zpool_create(const char *name, gfp_t gfp)
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{
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/*
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* Ignore global gfp flags: zs_malloc() may be invoked from
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27
mm/zswap.c
27
mm/zswap.c
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@ -258,10 +258,6 @@ static int zswap_writeback_entry(struct zpool *pool, unsigned long handle);
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static int zswap_pool_get(struct zswap_pool *pool);
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static void zswap_pool_put(struct zswap_pool *pool);
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static const struct zpool_ops zswap_zpool_ops = {
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.evict = zswap_writeback_entry
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};
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static bool zswap_is_full(void)
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{
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return totalram_pages() * zswap_max_pool_percent / 100 <
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@ -379,12 +375,9 @@ static void zswap_free_entry(struct zswap_entry *entry)
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if (!entry->length)
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atomic_dec(&zswap_same_filled_pages);
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else {
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/* zpool_evictable will be removed once all 3 backends have migrated */
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if (!zpool_evictable(entry->pool->zpool)) {
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spin_lock(&entry->pool->lru_lock);
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list_del(&entry->lru);
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spin_unlock(&entry->pool->lru_lock);
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}
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spin_lock(&entry->pool->lru_lock);
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list_del(&entry->lru);
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spin_unlock(&entry->pool->lru_lock);
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zpool_free(entry->pool->zpool, entry->handle);
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zswap_pool_put(entry->pool);
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}
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@ -665,12 +658,8 @@ static void shrink_worker(struct work_struct *w)
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shrink_work);
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int ret, failures = 0;
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/* zpool_evictable will be removed once all 3 backends have migrated */
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do {
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if (zpool_evictable(pool->zpool))
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ret = zpool_shrink(pool->zpool, 1, NULL);
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else
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ret = zswap_reclaim_entry(pool);
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ret = zswap_reclaim_entry(pool);
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if (ret) {
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zswap_reject_reclaim_fail++;
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if (ret != -EAGAIN)
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/* unique name for each pool specifically required by zsmalloc */
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snprintf(name, 38, "zswap%x", atomic_inc_return(&zswap_pools_count));
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pool->zpool = zpool_create_pool(type, name, gfp, &zswap_zpool_ops);
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pool->zpool = zpool_create_pool(type, name, gfp);
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if (!pool->zpool) {
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pr_err("%s zpool not available\n", type);
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goto error;
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zswap_entry_put(tree, dupentry);
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}
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} while (ret == -EEXIST);
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/* zpool_evictable will be removed once all 3 backends have migrated */
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if (entry->length && !zpool_evictable(entry->pool->zpool)) {
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if (entry->length) {
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spin_lock(&entry->pool->lru_lock);
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list_add(&entry->lru, &entry->pool->lru);
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spin_unlock(&entry->pool->lru_lock);
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if (!ret && zswap_exclusive_loads_enabled) {
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zswap_invalidate_entry(tree, entry);
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*exclusive = true;
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} else if (entry->length && !zpool_evictable(entry->pool->zpool)) {
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/* zpool_evictable will be removed once all 3 backends have migrated */
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} else if (entry->length) {
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spin_lock(&entry->pool->lru_lock);
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list_move(&entry->lru, &entry->pool->lru);
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spin_unlock(&entry->pool->lru_lock);
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