mirror of https://gitee.com/openkylin/linux.git
zram: use zcomp compressing backends
Do not perform direct LZO compress/decompress calls, initialise and use zcomp LZO backend (single compression stream) instead. [akpm@linux-foundation.org: resolve conflicts with zram-delete-zram_init_device-fix.patch] Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Acked-by: Minchan Kim <minchan@kernel.org> Cc: Jerome Marchand <jmarchan@redhat.com> Cc: Nitin Gupta <ngupta@vflare.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sergey Senozhatsky
Linus Torvalds
parent
e7e1ef439d
commit
b7ca232ee7
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@ -1,3 +1,3 @@
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zram-y := zram_drv.o
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zram-y := zcomp_lzo.o zcomp.o zram_drv.o
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obj-$(CONFIG_ZRAM) += zram.o
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@ -29,7 +29,6 @@
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#include <linux/genhd.h>
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#include <linux/highmem.h>
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#include <linux/slab.h>
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#include <linux/lzo.h>
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#include <linux/string.h>
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#include <linux/vmalloc.h>
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@ -38,6 +37,7 @@
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/* Globals */
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static int zram_major;
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static struct zram *zram_devices;
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static const char *default_compressor = "lzo";
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/* Module params (documentation at end) */
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static unsigned int num_devices = 1;
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@ -160,8 +160,6 @@ static inline int valid_io_request(struct zram *zram, struct bio *bio)
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static void zram_meta_free(struct zram_meta *meta)
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{
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zs_destroy_pool(meta->mem_pool);
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kfree(meta->compress_workmem);
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free_pages((unsigned long)meta->compress_buffer, 1);
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vfree(meta->table);
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kfree(meta);
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}
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@ -173,22 +171,11 @@ static struct zram_meta *zram_meta_alloc(u64 disksize)
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if (!meta)
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goto out;
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meta->compress_workmem = kzalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
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if (!meta->compress_workmem)
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goto free_meta;
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meta->compress_buffer =
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(void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1);
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if (!meta->compress_buffer) {
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pr_err("Error allocating compressor buffer space\n");
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goto free_workmem;
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}
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num_pages = disksize >> PAGE_SHIFT;
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meta->table = vzalloc(num_pages * sizeof(*meta->table));
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if (!meta->table) {
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pr_err("Error allocating zram address table\n");
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goto free_buffer;
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goto free_meta;
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}
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meta->mem_pool = zs_create_pool(GFP_NOIO | __GFP_HIGHMEM);
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@ -198,15 +185,10 @@ static struct zram_meta *zram_meta_alloc(u64 disksize)
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}
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rwlock_init(&meta->tb_lock);
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mutex_init(&meta->buffer_lock);
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return meta;
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free_table:
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vfree(meta->table);
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free_buffer:
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free_pages((unsigned long)meta->compress_buffer, 1);
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free_workmem:
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kfree(meta->compress_workmem);
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free_meta:
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kfree(meta);
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meta = NULL;
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@ -280,8 +262,7 @@ static void zram_free_page(struct zram *zram, size_t index)
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static int zram_decompress_page(struct zram *zram, char *mem, u32 index)
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{
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int ret = LZO_E_OK;
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size_t clen = PAGE_SIZE;
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int ret = 0;
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unsigned char *cmem;
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struct zram_meta *meta = zram->meta;
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unsigned long handle;
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@ -301,12 +282,12 @@ static int zram_decompress_page(struct zram *zram, char *mem, u32 index)
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if (size == PAGE_SIZE)
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copy_page(mem, cmem);
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else
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ret = lzo1x_decompress_safe(cmem, size, mem, &clen);
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ret = zcomp_decompress(zram->comp, cmem, size, mem);
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zs_unmap_object(meta->mem_pool, handle);
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read_unlock(&meta->tb_lock);
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/* Should NEVER happen. Return bio error if it does. */
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if (unlikely(ret != LZO_E_OK)) {
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if (unlikely(ret)) {
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pr_err("Decompression failed! err=%d, page=%u\n", ret, index);
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atomic64_inc(&zram->stats.failed_reads);
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return ret;
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@ -349,7 +330,7 @@ static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec,
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ret = zram_decompress_page(zram, uncmem, index);
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/* Should NEVER happen. Return bio error if it does. */
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if (unlikely(ret != LZO_E_OK))
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if (unlikely(ret))
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goto out_cleanup;
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if (is_partial_io(bvec))
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@ -374,11 +355,10 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
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struct page *page;
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unsigned char *user_mem, *cmem, *src, *uncmem = NULL;
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struct zram_meta *meta = zram->meta;
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struct zcomp_strm *zstrm;
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bool locked = false;
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page = bvec->bv_page;
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src = meta->compress_buffer;
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if (is_partial_io(bvec)) {
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/*
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* This is a partial IO. We need to read the full page
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@ -394,7 +374,7 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
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goto out;
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}
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mutex_lock(&meta->buffer_lock);
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zstrm = zcomp_strm_find(zram->comp);
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locked = true;
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user_mem = kmap_atomic(page);
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@ -420,22 +400,20 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
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goto out;
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}
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ret = lzo1x_1_compress(uncmem, PAGE_SIZE, src, &clen,
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meta->compress_workmem);
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ret = zcomp_compress(zram->comp, zstrm, uncmem, &clen);
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if (!is_partial_io(bvec)) {
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kunmap_atomic(user_mem);
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user_mem = NULL;
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uncmem = NULL;
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}
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if (unlikely(ret != LZO_E_OK)) {
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if (unlikely(ret)) {
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pr_err("Compression failed! err=%d\n", ret);
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goto out;
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}
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src = zstrm->buffer;
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if (unlikely(clen > max_zpage_size)) {
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clen = PAGE_SIZE;
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src = NULL;
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if (is_partial_io(bvec))
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src = uncmem;
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}
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@ -457,6 +435,8 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
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memcpy(cmem, src, clen);
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}
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zcomp_strm_release(zram->comp, zstrm);
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locked = false;
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zs_unmap_object(meta->mem_pool, handle);
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/*
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@ -475,10 +455,9 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
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atomic64_inc(&zram->stats.pages_stored);
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out:
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if (locked)
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mutex_unlock(&meta->buffer_lock);
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zcomp_strm_release(zram->comp, zstrm);
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if (is_partial_io(bvec))
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kfree(uncmem);
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if (ret)
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atomic64_inc(&zram->stats.failed_writes);
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return ret;
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@ -522,6 +501,7 @@ static void zram_reset_device(struct zram *zram, bool reset_capacity)
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zs_free(meta->mem_pool, handle);
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}
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zcomp_destroy(zram->comp);
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zram_meta_free(zram->meta);
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zram->meta = NULL;
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/* Reset stats */
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@ -539,6 +519,7 @@ static ssize_t disksize_store(struct device *dev,
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u64 disksize;
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struct zram_meta *meta;
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struct zram *zram = dev_to_zram(dev);
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int err;
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disksize = memparse(buf, NULL);
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if (!disksize)
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@ -551,10 +532,17 @@ static ssize_t disksize_store(struct device *dev,
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down_write(&zram->init_lock);
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if (init_done(zram)) {
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zram_meta_free(meta);
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up_write(&zram->init_lock);
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pr_info("Cannot change disksize for initialized device\n");
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return -EBUSY;
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err = -EBUSY;
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goto out_free_meta;
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}
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zram->comp = zcomp_create(default_compressor);
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if (!zram->comp) {
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pr_info("Cannot initialise %s compressing backend\n",
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default_compressor);
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err = -EINVAL;
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goto out_free_meta;
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}
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zram->meta = meta;
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@ -563,6 +551,11 @@ static ssize_t disksize_store(struct device *dev,
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up_write(&zram->init_lock);
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return len;
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out_free_meta:
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up_write(&zram->init_lock);
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zram_meta_free(meta);
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return err;
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}
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static ssize_t reset_store(struct device *dev,
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@ -16,9 +16,10 @@
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#define _ZRAM_DRV_H_
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <linux/zsmalloc.h>
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#include "zcomp.h"
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/*
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* Some arbitrary value. This is just to catch
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* invalid value for num_devices module parameter.
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@ -81,17 +82,16 @@ struct zram_stats {
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struct zram_meta {
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rwlock_t tb_lock; /* protect table */
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void *compress_workmem;
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void *compress_buffer;
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struct table *table;
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struct zs_pool *mem_pool;
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struct mutex buffer_lock; /* protect compress buffers */
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};
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struct zram {
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struct zram_meta *meta;
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struct request_queue *queue;
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struct gendisk *disk;
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struct zcomp *comp;
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/* Prevent concurrent execution of device init, reset and R/W request */
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struct rw_semaphore init_lock;
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/*
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