Instead of using a backend_registered to determine whether a backend is enabled. This allows us to remove the backend_register check and just do 'if (cleancache_ops)'
Signed-off-by: Konrad Rzeszutek Wilk <[email protected]> --- drivers/staging/ramster/zcache-main.c | 8 +++--- drivers/staging/zcache/zcache-main.c | 8 +++--- drivers/xen/tmem.c | 6 ++-- include/linux/cleancache.h | 2 +- mm/cleancache.c | 43 +++++++++++++++----------------- 5 files changed, 32 insertions(+), 35 deletions(-) diff --git a/drivers/staging/ramster/zcache-main.c b/drivers/staging/ramster/zcache-main.c index 6c8959d..ed99170 100644 --- a/drivers/staging/ramster/zcache-main.c +++ b/drivers/staging/ramster/zcache-main.c @@ -1495,9 +1495,9 @@ static struct cleancache_ops zcache_cleancache_ops = { .init_fs = zcache_cleancache_init_fs }; -struct cleancache_ops zcache_cleancache_register_ops(void) +struct cleancache_ops *zcache_cleancache_register_ops(void) { - struct cleancache_ops old_ops = + struct cleancache_ops *old_ops = cleancache_register_ops(&zcache_cleancache_ops); return old_ops; @@ -1781,7 +1781,7 @@ static int __init zcache_init(void) } zbud_init(); if (zcache_enabled && !disable_cleancache) { - struct cleancache_ops old_ops; + struct cleancache_ops *old_ops; register_shrinker(&zcache_shrinker); old_ops = zcache_cleancache_register_ops(); @@ -1791,7 +1791,7 @@ static int __init zcache_init(void) pr_info("%s: cleancache: ignorenonactive = %d\n", namestr, !disable_cleancache_ignore_nonactive); #endif - if (old_ops.init_fs != NULL) + if (old_ops) pr_warn("%s: cleancache_ops overridden\n", namestr); } if (zcache_enabled && !disable_frontswap) { diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c index 3db38cb..f9ab874 100644 --- a/drivers/staging/zcache/zcache-main.c +++ b/drivers/staging/zcache/zcache-main.c @@ -1811,9 +1811,9 @@ static struct cleancache_ops zcache_cleancache_ops = { .init_fs = zcache_cleancache_init_fs }; -struct cleancache_ops zcache_cleancache_register_ops(void) +struct cleancache_ops *zcache_cleancache_register_ops(void) { - struct cleancache_ops old_ops = + struct cleancache_ops *old_ops = cleancache_register_ops(&zcache_cleancache_ops); return old_ops; @@ -2048,14 +2048,14 @@ static int __init zcache_init(void) #ifdef CONFIG_CLEANCACHE if (zcache_enabled && use_cleancache) { - struct cleancache_ops old_ops; + struct cleancache_ops *old_ops; zbud_init(); register_shrinker(&zcache_shrinker); old_ops = zcache_cleancache_register_ops(); pr_info("zcache: cleancache enabled using kernel " "transcendent memory and compression buddies\n"); - if (old_ops.init_fs != NULL) + if (old_ops) pr_warning("zcache: cleancache_ops overridden"); } #endif diff --git a/drivers/xen/tmem.c b/drivers/xen/tmem.c index 4b02c07..15e776c 100644 --- a/drivers/xen/tmem.c +++ b/drivers/xen/tmem.c @@ -236,7 +236,7 @@ static int __init no_cleancache(char *s) } __setup("nocleancache", no_cleancache); -static struct cleancache_ops __initdata tmem_cleancache_ops = { +static struct cleancache_ops tmem_cleancache_ops = { .put_page = tmem_cleancache_put_page, .get_page = tmem_cleancache_get_page, .invalidate_page = tmem_cleancache_flush_page, @@ -392,9 +392,9 @@ static int __init xen_tmem_init(void) BUG_ON(sizeof(struct cleancache_filekey) != sizeof(struct tmem_oid)); if (tmem_enabled && use_cleancache) { char *s = ""; - struct cleancache_ops old_ops = + struct cleancache_ops *old_ops = cleancache_register_ops(&tmem_cleancache_ops); - if (old_ops.init_fs != NULL) + if (old_ops) s = " (WARNING: cleancache_ops overridden)"; printk(KERN_INFO "cleancache enabled, RAM provided by " "Xen Transcendent Memory%s\n", s); diff --git a/include/linux/cleancache.h b/include/linux/cleancache.h index 42e55de..3af5ea8 100644 --- a/include/linux/cleancache.h +++ b/include/linux/cleancache.h @@ -33,7 +33,7 @@ struct cleancache_ops { void (*invalidate_fs)(int); }; -extern struct cleancache_ops +extern struct cleancache_ops * cleancache_register_ops(struct cleancache_ops *ops); extern void __cleancache_init_fs(struct super_block *); extern void __cleancache_init_shared_fs(char *, struct super_block *); diff --git a/mm/cleancache.c b/mm/cleancache.c index 318a0ad..95f6618 100644 --- a/mm/cleancache.c +++ b/mm/cleancache.c @@ -32,7 +32,7 @@ EXPORT_SYMBOL(cleancache_enabled); * cleancache_ops is set by cleancache_ops_register to contain the pointers * to the cleancache "backend" implementation functions. */ -static struct cleancache_ops cleancache_ops __read_mostly; +static struct cleancache_ops *cleancache_ops __read_mostly; /* * Counters available via /sys/kernel/debug/frontswap (if debugfs is @@ -63,27 +63,24 @@ static int fs_poolid_map[MAX_INITIALIZABLE_FS]; static int shared_fs_poolid_map[MAX_INITIALIZABLE_FS]; static char *uuids[MAX_INITIALIZABLE_FS]; -static bool __read_mostly backend_registered; /* * register operations for cleancache, returning previous thus allowing * detection of multiple backends and possible nesting */ -struct cleancache_ops cleancache_register_ops(struct cleancache_ops *ops) +struct cleancache_ops *cleancache_register_ops(struct cleancache_ops *ops) { - struct cleancache_ops old = cleancache_ops; + struct cleancache_ops *old = cleancache_ops; int i; - cleancache_ops = *ops; - - backend_registered = true; for (i = 0; i < MAX_INITIALIZABLE_FS; i++) { if (fs_poolid_map[i] == FS_NO_BACKEND) - fs_poolid_map[i] = (*cleancache_ops.init_fs)(PAGE_SIZE); + fs_poolid_map[i] = ops->init_fs(PAGE_SIZE); if (shared_fs_poolid_map[i] == FS_NO_BACKEND) - shared_fs_poolid_map[i] = (*cleancache_ops.init_shared_fs) + shared_fs_poolid_map[i] = ops->init_shared_fs (uuids[i], PAGE_SIZE); } + cleancache_ops = ops; return old; } EXPORT_SYMBOL(cleancache_register_ops); @@ -96,8 +93,8 @@ void __cleancache_init_fs(struct super_block *sb) for (i = 0; i < MAX_INITIALIZABLE_FS; i++) { if (fs_poolid_map[i] == FS_UNKNOWN) { sb->cleancache_poolid = i + FAKE_FS_POOLID_OFFSET; - if (backend_registered) - fs_poolid_map[i] = (*cleancache_ops.init_fs)(PAGE_SIZE); + if (cleancache_ops) + fs_poolid_map[i] = cleancache_ops->init_fs(PAGE_SIZE); else fs_poolid_map[i] = FS_NO_BACKEND; break; @@ -115,8 +112,8 @@ void __cleancache_init_shared_fs(char *uuid, struct super_block *sb) if (shared_fs_poolid_map[i] == FS_UNKNOWN) { sb->cleancache_poolid = i + FAKE_SHARED_FS_POOLID_OFFSET; uuids[i] = uuid; - if (backend_registered) - shared_fs_poolid_map[i] = (*cleancache_ops.init_shared_fs) + if (cleancache_ops) + shared_fs_poolid_map[i] = cleancache_ops->init_shared_fs (uuid, PAGE_SIZE); else shared_fs_poolid_map[i] = FS_NO_BACKEND; @@ -178,7 +175,7 @@ int __cleancache_get_page(struct page *page) int fake_pool_id; struct cleancache_filekey key = { .u.key = { 0 } }; - if (!backend_registered) { + if (!cleancache_ops) { cleancache_failed_gets++; goto out; } @@ -193,7 +190,7 @@ int __cleancache_get_page(struct page *page) goto out; if (pool_id >= 0) - ret = (*cleancache_ops.get_page)(pool_id, + ret = cleancache_ops->get_page(pool_id, key, page->index, page); if (ret == 0) cleancache_succ_gets++; @@ -216,7 +213,7 @@ void __cleancache_put_page(struct page *page) int fake_pool_id; struct cleancache_filekey key = { .u.key = { 0 } }; - if (!backend_registered) { + if (!cleancache_ops) { cleancache_puts++; return; } @@ -230,7 +227,7 @@ void __cleancache_put_page(struct page *page) if (pool_id >= 0 && cleancache_get_key(page->mapping->host, &key) >= 0) { - (*cleancache_ops.put_page)(pool_id, key, page->index, page); + cleancache_ops->put_page(pool_id, key, page->index, page); cleancache_puts++; } } @@ -248,7 +245,7 @@ void __cleancache_invalidate_page(struct address_space *mapping, int fake_pool_id = mapping->host->i_sb->cleancache_poolid; struct cleancache_filekey key = { .u.key = { 0 } }; - if (!backend_registered) + if (!cleancache_ops) return; if (fake_pool_id >= 0) { @@ -258,7 +255,7 @@ void __cleancache_invalidate_page(struct address_space *mapping, VM_BUG_ON(!PageLocked(page)); if (cleancache_get_key(mapping->host, &key) >= 0) { - (*cleancache_ops.invalidate_page)(pool_id, + cleancache_ops->invalidate_page(pool_id, key, page->index); cleancache_invalidates++; } @@ -277,7 +274,7 @@ void __cleancache_invalidate_inode(struct address_space *mapping) int fake_pool_id = mapping->host->i_sb->cleancache_poolid; struct cleancache_filekey key = { .u.key = { 0 } }; - if (!backend_registered) + if (!cleancache_ops) return; if (fake_pool_id < 0) @@ -286,7 +283,7 @@ void __cleancache_invalidate_inode(struct address_space *mapping) pool_id = get_poolid_from_fake(fake_pool_id); if (pool_id >= 0 && cleancache_get_key(mapping->host, &key) >= 0) - (*cleancache_ops.invalidate_inode)(pool_id, key); + cleancache_ops->invalidate_inode(pool_id, key); } EXPORT_SYMBOL(__cleancache_invalidate_inode); @@ -312,8 +309,8 @@ void __cleancache_invalidate_fs(struct super_block *sb) fs_poolid_map[index] = FS_UNKNOWN; } sb->cleancache_poolid = -1; - if (backend_registered) - (*cleancache_ops.invalidate_fs)(old_poolid); + if (cleancache_ops) + cleancache_ops->invalidate_fs(old_poolid); } EXPORT_SYMBOL(__cleancache_invalidate_fs); -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
