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-rw-r--r--fs/f2fs/compress.c2054
1 files changed, 2054 insertions, 0 deletions
diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
new file mode 100644
index 000000000..4cb58e8d6
--- /dev/null
+++ b/fs/f2fs/compress.c
@@ -0,0 +1,2054 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * f2fs compress support
+ *
+ * Copyright (c) 2019 Chao Yu <chao@kernel.org>
+ */
+
+#include <linux/fs.h>
+#include <linux/f2fs_fs.h>
+#include <linux/moduleparam.h>
+#include <linux/writeback.h>
+#include <linux/backing-dev.h>
+#include <linux/lzo.h>
+#include <linux/lz4.h>
+#include <linux/zstd.h>
+#include <linux/pagevec.h>
+
+#include "f2fs.h"
+#include "node.h"
+#include "segment.h"
+#include <trace/events/f2fs.h>
+
+static struct kmem_cache *cic_entry_slab;
+static struct kmem_cache *dic_entry_slab;
+
+static void *page_array_alloc(struct inode *inode, int nr)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+ unsigned int size = sizeof(struct page *) * nr;
+
+ if (likely(size <= sbi->page_array_slab_size))
+ return f2fs_kmem_cache_alloc(sbi->page_array_slab,
+ GFP_F2FS_ZERO, false, F2FS_I_SB(inode));
+ return f2fs_kzalloc(sbi, size, GFP_NOFS);
+}
+
+static void page_array_free(struct inode *inode, void *pages, int nr)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+ unsigned int size = sizeof(struct page *) * nr;
+
+ if (!pages)
+ return;
+
+ if (likely(size <= sbi->page_array_slab_size))
+ kmem_cache_free(sbi->page_array_slab, pages);
+ else
+ kfree(pages);
+}
+
+struct f2fs_compress_ops {
+ int (*init_compress_ctx)(struct compress_ctx *cc);
+ void (*destroy_compress_ctx)(struct compress_ctx *cc);
+ int (*compress_pages)(struct compress_ctx *cc);
+ int (*init_decompress_ctx)(struct decompress_io_ctx *dic);
+ void (*destroy_decompress_ctx)(struct decompress_io_ctx *dic);
+ int (*decompress_pages)(struct decompress_io_ctx *dic);
+};
+
+static unsigned int offset_in_cluster(struct compress_ctx *cc, pgoff_t index)
+{
+ return index & (cc->cluster_size - 1);
+}
+
+static pgoff_t cluster_idx(struct compress_ctx *cc, pgoff_t index)
+{
+ return index >> cc->log_cluster_size;
+}
+
+static pgoff_t start_idx_of_cluster(struct compress_ctx *cc)
+{
+ return cc->cluster_idx << cc->log_cluster_size;
+}
+
+bool f2fs_is_compressed_page(struct page *page)
+{
+ if (!PagePrivate(page))
+ return false;
+ if (!page_private(page))
+ return false;
+ if (page_private_nonpointer(page))
+ return false;
+
+ f2fs_bug_on(F2FS_M_SB(page->mapping),
+ *((u32 *)page_private(page)) != F2FS_COMPRESSED_PAGE_MAGIC);
+ return true;
+}
+
+static void f2fs_set_compressed_page(struct page *page,
+ struct inode *inode, pgoff_t index, void *data)
+{
+ attach_page_private(page, (void *)data);
+
+ /* i_crypto_info and iv index */
+ page->index = index;
+ page->mapping = inode->i_mapping;
+}
+
+static void f2fs_drop_rpages(struct compress_ctx *cc, int len, bool unlock)
+{
+ int i;
+
+ for (i = 0; i < len; i++) {
+ if (!cc->rpages[i])
+ continue;
+ if (unlock)
+ unlock_page(cc->rpages[i]);
+ else
+ put_page(cc->rpages[i]);
+ }
+}
+
+static void f2fs_put_rpages(struct compress_ctx *cc)
+{
+ f2fs_drop_rpages(cc, cc->cluster_size, false);
+}
+
+static void f2fs_unlock_rpages(struct compress_ctx *cc, int len)
+{
+ f2fs_drop_rpages(cc, len, true);
+}
+
+static void f2fs_put_rpages_wbc(struct compress_ctx *cc,
+ struct writeback_control *wbc, bool redirty, int unlock)
+{
+ unsigned int i;
+
+ for (i = 0; i < cc->cluster_size; i++) {
+ if (!cc->rpages[i])
+ continue;
+ if (redirty)
+ redirty_page_for_writepage(wbc, cc->rpages[i]);
+ f2fs_put_page(cc->rpages[i], unlock);
+ }
+}
+
+struct page *f2fs_compress_control_page(struct page *page)
+{
+ return ((struct compress_io_ctx *)page_private(page))->rpages[0];
+}
+
+int f2fs_init_compress_ctx(struct compress_ctx *cc)
+{
+ if (cc->rpages)
+ return 0;
+
+ cc->rpages = page_array_alloc(cc->inode, cc->cluster_size);
+ return cc->rpages ? 0 : -ENOMEM;
+}
+
+void f2fs_destroy_compress_ctx(struct compress_ctx *cc, bool reuse)
+{
+ page_array_free(cc->inode, cc->rpages, cc->cluster_size);
+ cc->rpages = NULL;
+ cc->nr_rpages = 0;
+ cc->nr_cpages = 0;
+ cc->valid_nr_cpages = 0;
+ if (!reuse)
+ cc->cluster_idx = NULL_CLUSTER;
+}
+
+void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
+{
+ unsigned int cluster_ofs;
+
+ if (!f2fs_cluster_can_merge_page(cc, page->index))
+ f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
+
+ cluster_ofs = offset_in_cluster(cc, page->index);
+ cc->rpages[cluster_ofs] = page;
+ cc->nr_rpages++;
+ cc->cluster_idx = cluster_idx(cc, page->index);
+}
+
+#ifdef CONFIG_F2FS_FS_LZO
+static int lzo_init_compress_ctx(struct compress_ctx *cc)
+{
+ cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
+ LZO1X_MEM_COMPRESS, GFP_NOFS);
+ if (!cc->private)
+ return -ENOMEM;
+
+ cc->clen = lzo1x_worst_compress(PAGE_SIZE << cc->log_cluster_size);
+ return 0;
+}
+
+static void lzo_destroy_compress_ctx(struct compress_ctx *cc)
+{
+ kvfree(cc->private);
+ cc->private = NULL;
+}
+
+static int lzo_compress_pages(struct compress_ctx *cc)
+{
+ int ret;
+
+ ret = lzo1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
+ &cc->clen, cc->private);
+ if (ret != LZO_E_OK) {
+ printk_ratelimited("%sF2FS-fs (%s): lzo compress failed, ret:%d\n",
+ KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
+ return -EIO;
+ }
+ return 0;
+}
+
+static int lzo_decompress_pages(struct decompress_io_ctx *dic)
+{
+ int ret;
+
+ ret = lzo1x_decompress_safe(dic->cbuf->cdata, dic->clen,
+ dic->rbuf, &dic->rlen);
+ if (ret != LZO_E_OK) {
+ printk_ratelimited("%sF2FS-fs (%s): lzo decompress failed, ret:%d\n",
+ KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
+ return -EIO;
+ }
+
+ if (dic->rlen != PAGE_SIZE << dic->log_cluster_size) {
+ printk_ratelimited("%sF2FS-fs (%s): lzo invalid rlen:%zu, "
+ "expected:%lu\n", KERN_ERR,
+ F2FS_I_SB(dic->inode)->sb->s_id,
+ dic->rlen,
+ PAGE_SIZE << dic->log_cluster_size);
+ return -EIO;
+ }
+ return 0;
+}
+
+static const struct f2fs_compress_ops f2fs_lzo_ops = {
+ .init_compress_ctx = lzo_init_compress_ctx,
+ .destroy_compress_ctx = lzo_destroy_compress_ctx,
+ .compress_pages = lzo_compress_pages,
+ .decompress_pages = lzo_decompress_pages,
+};
+#endif
+
+#ifdef CONFIG_F2FS_FS_LZ4
+static int lz4_init_compress_ctx(struct compress_ctx *cc)
+{
+ unsigned int size = LZ4_MEM_COMPRESS;
+
+#ifdef CONFIG_F2FS_FS_LZ4HC
+ if (F2FS_I(cc->inode)->i_compress_level)
+ size = LZ4HC_MEM_COMPRESS;
+#endif
+
+ cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode), size, GFP_NOFS);
+ if (!cc->private)
+ return -ENOMEM;
+
+ /*
+ * we do not change cc->clen to LZ4_compressBound(inputsize) to
+ * adapt worst compress case, because lz4 compressor can handle
+ * output budget properly.
+ */
+ cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
+ return 0;
+}
+
+static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
+{
+ kvfree(cc->private);
+ cc->private = NULL;
+}
+
+#ifdef CONFIG_F2FS_FS_LZ4HC
+static int lz4hc_compress_pages(struct compress_ctx *cc)
+{
+ unsigned char level = F2FS_I(cc->inode)->i_compress_level;
+ int len;
+
+ if (level)
+ len = LZ4_compress_HC(cc->rbuf, cc->cbuf->cdata, cc->rlen,
+ cc->clen, level, cc->private);
+ else
+ len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
+ cc->clen, cc->private);
+ if (!len)
+ return -EAGAIN;
+
+ cc->clen = len;
+ return 0;
+}
+#endif
+
+static int lz4_compress_pages(struct compress_ctx *cc)
+{
+ int len;
+
+#ifdef CONFIG_F2FS_FS_LZ4HC
+ return lz4hc_compress_pages(cc);
+#endif
+ len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
+ cc->clen, cc->private);
+ if (!len)
+ return -EAGAIN;
+
+ cc->clen = len;
+ return 0;
+}
+
+static int lz4_decompress_pages(struct decompress_io_ctx *dic)
+{
+ int ret;
+
+ ret = LZ4_decompress_safe(dic->cbuf->cdata, dic->rbuf,
+ dic->clen, dic->rlen);
+ if (ret < 0) {
+ printk_ratelimited("%sF2FS-fs (%s): lz4 decompress failed, ret:%d\n",
+ KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
+ return -EIO;
+ }
+
+ if (ret != PAGE_SIZE << dic->log_cluster_size) {
+ printk_ratelimited("%sF2FS-fs (%s): lz4 invalid ret:%d, "
+ "expected:%lu\n", KERN_ERR,
+ F2FS_I_SB(dic->inode)->sb->s_id, ret,
+ PAGE_SIZE << dic->log_cluster_size);
+ return -EIO;
+ }
+ return 0;
+}
+
+static const struct f2fs_compress_ops f2fs_lz4_ops = {
+ .init_compress_ctx = lz4_init_compress_ctx,
+ .destroy_compress_ctx = lz4_destroy_compress_ctx,
+ .compress_pages = lz4_compress_pages,
+ .decompress_pages = lz4_decompress_pages,
+};
+#endif
+
+#ifdef CONFIG_F2FS_FS_ZSTD
+static int zstd_init_compress_ctx(struct compress_ctx *cc)
+{
+ zstd_parameters params;
+ zstd_cstream *stream;
+ void *workspace;
+ unsigned int workspace_size;
+ unsigned char level = F2FS_I(cc->inode)->i_compress_level;
+
+ /* Need to remain this for backward compatibility */
+ if (!level)
+ level = F2FS_ZSTD_DEFAULT_CLEVEL;
+
+ params = zstd_get_params(level, cc->rlen);
+ workspace_size = zstd_cstream_workspace_bound(&params.cParams);
+
+ workspace = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
+ workspace_size, GFP_NOFS);
+ if (!workspace)
+ return -ENOMEM;
+
+ stream = zstd_init_cstream(&params, 0, workspace, workspace_size);
+ if (!stream) {
+ printk_ratelimited("%sF2FS-fs (%s): %s zstd_init_cstream failed\n",
+ KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
+ __func__);
+ kvfree(workspace);
+ return -EIO;
+ }
+
+ cc->private = workspace;
+ cc->private2 = stream;
+
+ cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
+ return 0;
+}
+
+static void zstd_destroy_compress_ctx(struct compress_ctx *cc)
+{
+ kvfree(cc->private);
+ cc->private = NULL;
+ cc->private2 = NULL;
+}
+
+static int zstd_compress_pages(struct compress_ctx *cc)
+{
+ zstd_cstream *stream = cc->private2;
+ zstd_in_buffer inbuf;
+ zstd_out_buffer outbuf;
+ int src_size = cc->rlen;
+ int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
+ int ret;
+
+ inbuf.pos = 0;
+ inbuf.src = cc->rbuf;
+ inbuf.size = src_size;
+
+ outbuf.pos = 0;
+ outbuf.dst = cc->cbuf->cdata;
+ outbuf.size = dst_size;
+
+ ret = zstd_compress_stream(stream, &outbuf, &inbuf);
+ if (zstd_is_error(ret)) {
+ printk_ratelimited("%sF2FS-fs (%s): %s zstd_compress_stream failed, ret: %d\n",
+ KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
+ __func__, zstd_get_error_code(ret));
+ return -EIO;
+ }
+
+ ret = zstd_end_stream(stream, &outbuf);
+ if (zstd_is_error(ret)) {
+ printk_ratelimited("%sF2FS-fs (%s): %s zstd_end_stream returned %d\n",
+ KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
+ __func__, zstd_get_error_code(ret));
+ return -EIO;
+ }
+
+ /*
+ * there is compressed data remained in intermediate buffer due to
+ * no more space in cbuf.cdata
+ */
+ if (ret)
+ return -EAGAIN;
+
+ cc->clen = outbuf.pos;
+ return 0;
+}
+
+static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
+{
+ zstd_dstream *stream;
+ void *workspace;
+ unsigned int workspace_size;
+ unsigned int max_window_size =
+ MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size);
+
+ workspace_size = zstd_dstream_workspace_bound(max_window_size);
+
+ workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
+ workspace_size, GFP_NOFS);
+ if (!workspace)
+ return -ENOMEM;
+
+ stream = zstd_init_dstream(max_window_size, workspace, workspace_size);
+ if (!stream) {
+ printk_ratelimited("%sF2FS-fs (%s): %s zstd_init_dstream failed\n",
+ KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
+ __func__);
+ kvfree(workspace);
+ return -EIO;
+ }
+
+ dic->private = workspace;
+ dic->private2 = stream;
+
+ return 0;
+}
+
+static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
+{
+ kvfree(dic->private);
+ dic->private = NULL;
+ dic->private2 = NULL;
+}
+
+static int zstd_decompress_pages(struct decompress_io_ctx *dic)
+{
+ zstd_dstream *stream = dic->private2;
+ zstd_in_buffer inbuf;
+ zstd_out_buffer outbuf;
+ int ret;
+
+ inbuf.pos = 0;
+ inbuf.src = dic->cbuf->cdata;
+ inbuf.size = dic->clen;
+
+ outbuf.pos = 0;
+ outbuf.dst = dic->rbuf;
+ outbuf.size = dic->rlen;
+
+ ret = zstd_decompress_stream(stream, &outbuf, &inbuf);
+ if (zstd_is_error(ret)) {
+ printk_ratelimited("%sF2FS-fs (%s): %s zstd_decompress_stream failed, ret: %d\n",
+ KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
+ __func__, zstd_get_error_code(ret));
+ return -EIO;
+ }
+
+ if (dic->rlen != outbuf.pos) {
+ printk_ratelimited("%sF2FS-fs (%s): %s ZSTD invalid rlen:%zu, "
+ "expected:%lu\n", KERN_ERR,
+ F2FS_I_SB(dic->inode)->sb->s_id,
+ __func__, dic->rlen,
+ PAGE_SIZE << dic->log_cluster_size);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static const struct f2fs_compress_ops f2fs_zstd_ops = {
+ .init_compress_ctx = zstd_init_compress_ctx,
+ .destroy_compress_ctx = zstd_destroy_compress_ctx,
+ .compress_pages = zstd_compress_pages,
+ .init_decompress_ctx = zstd_init_decompress_ctx,
+ .destroy_decompress_ctx = zstd_destroy_decompress_ctx,
+ .decompress_pages = zstd_decompress_pages,
+};
+#endif
+
+#ifdef CONFIG_F2FS_FS_LZO
+#ifdef CONFIG_F2FS_FS_LZORLE
+static int lzorle_compress_pages(struct compress_ctx *cc)
+{
+ int ret;
+
+ ret = lzorle1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
+ &cc->clen, cc->private);
+ if (ret != LZO_E_OK) {
+ printk_ratelimited("%sF2FS-fs (%s): lzo-rle compress failed, ret:%d\n",
+ KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
+ return -EIO;
+ }
+ return 0;
+}
+
+static const struct f2fs_compress_ops f2fs_lzorle_ops = {
+ .init_compress_ctx = lzo_init_compress_ctx,
+ .destroy_compress_ctx = lzo_destroy_compress_ctx,
+ .compress_pages = lzorle_compress_pages,
+ .decompress_pages = lzo_decompress_pages,
+};
+#endif
+#endif
+
+static const struct f2fs_compress_ops *f2fs_cops[COMPRESS_MAX] = {
+#ifdef CONFIG_F2FS_FS_LZO
+ &f2fs_lzo_ops,
+#else
+ NULL,
+#endif
+#ifdef CONFIG_F2FS_FS_LZ4
+ &f2fs_lz4_ops,
+#else
+ NULL,
+#endif
+#ifdef CONFIG_F2FS_FS_ZSTD
+ &f2fs_zstd_ops,
+#else
+ NULL,
+#endif
+#if defined(CONFIG_F2FS_FS_LZO) && defined(CONFIG_F2FS_FS_LZORLE)
+ &f2fs_lzorle_ops,
+#else
+ NULL,
+#endif
+};
+
+bool f2fs_is_compress_backend_ready(struct inode *inode)
+{
+ if (!f2fs_compressed_file(inode))
+ return true;
+ return f2fs_cops[F2FS_I(inode)->i_compress_algorithm];
+}
+
+static mempool_t *compress_page_pool;
+static int num_compress_pages = 512;
+module_param(num_compress_pages, uint, 0444);
+MODULE_PARM_DESC(num_compress_pages,
+ "Number of intermediate compress pages to preallocate");
+
+int f2fs_init_compress_mempool(void)
+{
+ compress_page_pool = mempool_create_page_pool(num_compress_pages, 0);
+ if (!compress_page_pool)
+ return -ENOMEM;
+
+ return 0;
+}
+
+void f2fs_destroy_compress_mempool(void)
+{
+ mempool_destroy(compress_page_pool);
+}
+
+static struct page *f2fs_compress_alloc_page(void)
+{
+ struct page *page;
+
+ page = mempool_alloc(compress_page_pool, GFP_NOFS);
+ lock_page(page);
+
+ return page;
+}
+
+static void f2fs_compress_free_page(struct page *page)
+{
+ if (!page)
+ return;
+ detach_page_private(page);
+ page->mapping = NULL;
+ unlock_page(page);
+ mempool_free(page, compress_page_pool);
+}
+
+#define MAX_VMAP_RETRIES 3
+
+static void *f2fs_vmap(struct page **pages, unsigned int count)
+{
+ int i;
+ void *buf = NULL;
+
+ for (i = 0; i < MAX_VMAP_RETRIES; i++) {
+ buf = vm_map_ram(pages, count, -1);
+ if (buf)
+ break;
+ vm_unmap_aliases();
+ }
+ return buf;
+}
+
+static int f2fs_compress_pages(struct compress_ctx *cc)
+{
+ struct f2fs_inode_info *fi = F2FS_I(cc->inode);
+ const struct f2fs_compress_ops *cops =
+ f2fs_cops[fi->i_compress_algorithm];
+ unsigned int max_len, new_nr_cpages;
+ u32 chksum = 0;
+ int i, ret;
+
+ trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
+ cc->cluster_size, fi->i_compress_algorithm);
+
+ if (cops->init_compress_ctx) {
+ ret = cops->init_compress_ctx(cc);
+ if (ret)
+ goto out;
+ }
+
+ max_len = COMPRESS_HEADER_SIZE + cc->clen;
+ cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
+ cc->valid_nr_cpages = cc->nr_cpages;
+
+ cc->cpages = page_array_alloc(cc->inode, cc->nr_cpages);
+ if (!cc->cpages) {
+ ret = -ENOMEM;
+ goto destroy_compress_ctx;
+ }
+
+ for (i = 0; i < cc->nr_cpages; i++) {
+ cc->cpages[i] = f2fs_compress_alloc_page();
+ if (!cc->cpages[i]) {
+ ret = -ENOMEM;
+ goto out_free_cpages;
+ }
+ }
+
+ cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
+ if (!cc->rbuf) {
+ ret = -ENOMEM;
+ goto out_free_cpages;
+ }
+
+ cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
+ if (!cc->cbuf) {
+ ret = -ENOMEM;
+ goto out_vunmap_rbuf;
+ }
+
+ ret = cops->compress_pages(cc);
+ if (ret)
+ goto out_vunmap_cbuf;
+
+ max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
+
+ if (cc->clen > max_len) {
+ ret = -EAGAIN;
+ goto out_vunmap_cbuf;
+ }
+
+ cc->cbuf->clen = cpu_to_le32(cc->clen);
+
+ if (fi->i_compress_flag & BIT(COMPRESS_CHKSUM))
+ chksum = f2fs_crc32(F2FS_I_SB(cc->inode),
+ cc->cbuf->cdata, cc->clen);
+ cc->cbuf->chksum = cpu_to_le32(chksum);
+
+ for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
+ cc->cbuf->reserved[i] = cpu_to_le32(0);
+
+ new_nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
+
+ /* zero out any unused part of the last page */
+ memset(&cc->cbuf->cdata[cc->clen], 0,
+ (new_nr_cpages * PAGE_SIZE) -
+ (cc->clen + COMPRESS_HEADER_SIZE));
+
+ vm_unmap_ram(cc->cbuf, cc->nr_cpages);
+ vm_unmap_ram(cc->rbuf, cc->cluster_size);
+
+ for (i = 0; i < cc->nr_cpages; i++) {
+ if (i < new_nr_cpages)
+ continue;
+ f2fs_compress_free_page(cc->cpages[i]);
+ cc->cpages[i] = NULL;
+ }
+
+ if (cops->destroy_compress_ctx)
+ cops->destroy_compress_ctx(cc);
+
+ cc->valid_nr_cpages = new_nr_cpages;
+
+ trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
+ cc->clen, ret);
+ return 0;
+
+out_vunmap_cbuf:
+ vm_unmap_ram(cc->cbuf, cc->nr_cpages);
+out_vunmap_rbuf:
+ vm_unmap_ram(cc->rbuf, cc->cluster_size);
+out_free_cpages:
+ for (i = 0; i < cc->nr_cpages; i++) {
+ if (cc->cpages[i])
+ f2fs_compress_free_page(cc->cpages[i]);
+ }
+ page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
+ cc->cpages = NULL;
+destroy_compress_ctx:
+ if (cops->destroy_compress_ctx)
+ cops->destroy_compress_ctx(cc);
+out:
+ trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
+ cc->clen, ret);
+ return ret;
+}
+
+static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic,
+ bool pre_alloc);
+static void f2fs_release_decomp_mem(struct decompress_io_ctx *dic,
+ bool bypass_destroy_callback, bool pre_alloc);
+
+void f2fs_decompress_cluster(struct decompress_io_ctx *dic, bool in_task)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
+ struct f2fs_inode_info *fi = F2FS_I(dic->inode);
+ const struct f2fs_compress_ops *cops =
+ f2fs_cops[fi->i_compress_algorithm];
+ bool bypass_callback = false;
+ int ret;
+
+ trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
+ dic->cluster_size, fi->i_compress_algorithm);
+
+ if (dic->failed) {
+ ret = -EIO;
+ goto out_end_io;
+ }
+
+ ret = f2fs_prepare_decomp_mem(dic, false);
+ if (ret) {
+ bypass_callback = true;
+ goto out_release;
+ }
+
+ dic->clen = le32_to_cpu(dic->cbuf->clen);
+ dic->rlen = PAGE_SIZE << dic->log_cluster_size;
+
+ if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
+ ret = -EFSCORRUPTED;
+
+ /* Avoid f2fs_commit_super in irq context */
+ if (!in_task)
+ f2fs_save_errors(sbi, ERROR_FAIL_DECOMPRESSION);
+ else
+ f2fs_handle_error(sbi, ERROR_FAIL_DECOMPRESSION);
+ goto out_release;
+ }
+
+ ret = cops->decompress_pages(dic);
+
+ if (!ret && (fi->i_compress_flag & BIT(COMPRESS_CHKSUM))) {
+ u32 provided = le32_to_cpu(dic->cbuf->chksum);
+ u32 calculated = f2fs_crc32(sbi, dic->cbuf->cdata, dic->clen);
+
+ if (provided != calculated) {
+ if (!is_inode_flag_set(dic->inode, FI_COMPRESS_CORRUPT)) {
+ set_inode_flag(dic->inode, FI_COMPRESS_CORRUPT);
+ printk_ratelimited(
+ "%sF2FS-fs (%s): checksum invalid, nid = %lu, %x vs %x",
+ KERN_INFO, sbi->sb->s_id, dic->inode->i_ino,
+ provided, calculated);
+ }
+ set_sbi_flag(sbi, SBI_NEED_FSCK);
+ }
+ }
+
+out_release:
+ f2fs_release_decomp_mem(dic, bypass_callback, false);
+
+out_end_io:
+ trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
+ dic->clen, ret);
+ f2fs_decompress_end_io(dic, ret, in_task);
+}
+
+/*
+ * This is called when a page of a compressed cluster has been read from disk
+ * (or failed to be read from disk). It checks whether this page was the last
+ * page being waited on in the cluster, and if so, it decompresses the cluster
+ * (or in the case of a failure, cleans up without actually decompressing).
+ */
+void f2fs_end_read_compressed_page(struct page *page, bool failed,
+ block_t blkaddr, bool in_task)
+{
+ struct decompress_io_ctx *dic =
+ (struct decompress_io_ctx *)page_private(page);
+ struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
+
+ dec_page_count(sbi, F2FS_RD_DATA);
+
+ if (failed)
+ WRITE_ONCE(dic->failed, true);
+ else if (blkaddr && in_task)
+ f2fs_cache_compressed_page(sbi, page,
+ dic->inode->i_ino, blkaddr);
+
+ if (atomic_dec_and_test(&dic->remaining_pages))
+ f2fs_decompress_cluster(dic, in_task);
+}
+
+static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
+{
+ if (cc->cluster_idx == NULL_CLUSTER)
+ return true;
+ return cc->cluster_idx == cluster_idx(cc, index);
+}
+
+bool f2fs_cluster_is_empty(struct compress_ctx *cc)
+{
+ return cc->nr_rpages == 0;
+}
+
+static bool f2fs_cluster_is_full(struct compress_ctx *cc)
+{
+ return cc->cluster_size == cc->nr_rpages;
+}
+
+bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
+{
+ if (f2fs_cluster_is_empty(cc))
+ return true;
+ return is_page_in_cluster(cc, index);
+}
+
+bool f2fs_all_cluster_page_ready(struct compress_ctx *cc, struct page **pages,
+ int index, int nr_pages, bool uptodate)
+{
+ unsigned long pgidx = pages[index]->index;
+ int i = uptodate ? 0 : 1;
+
+ /*
+ * when uptodate set to true, try to check all pages in cluster is
+ * uptodate or not.
+ */
+ if (uptodate && (pgidx % cc->cluster_size))
+ return false;
+
+ if (nr_pages - index < cc->cluster_size)
+ return false;
+
+ for (; i < cc->cluster_size; i++) {
+ if (pages[index + i]->index != pgidx + i)
+ return false;
+ if (uptodate && !PageUptodate(pages[index + i]))
+ return false;
+ }
+
+ return true;
+}
+
+static bool cluster_has_invalid_data(struct compress_ctx *cc)
+{
+ loff_t i_size = i_size_read(cc->inode);
+ unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
+ int i;
+
+ for (i = 0; i < cc->cluster_size; i++) {
+ struct page *page = cc->rpages[i];
+
+ f2fs_bug_on(F2FS_I_SB(cc->inode), !page);
+
+ /* beyond EOF */
+ if (page->index >= nr_pages)
+ return true;
+ }
+ return false;
+}
+
+bool f2fs_sanity_check_cluster(struct dnode_of_data *dn)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
+ unsigned int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
+ bool compressed = dn->data_blkaddr == COMPRESS_ADDR;
+ int cluster_end = 0;
+ int i;
+ char *reason = "";
+
+ if (!compressed)
+ return false;
+
+ /* [..., COMPR_ADDR, ...] */
+ if (dn->ofs_in_node % cluster_size) {
+ reason = "[*|C|*|*]";
+ goto out;
+ }
+
+ for (i = 1; i < cluster_size; i++) {
+ block_t blkaddr = data_blkaddr(dn->inode, dn->node_page,
+ dn->ofs_in_node + i);
+
+ /* [COMPR_ADDR, ..., COMPR_ADDR] */
+ if (blkaddr == COMPRESS_ADDR) {
+ reason = "[C|*|C|*]";
+ goto out;
+ }
+ if (!__is_valid_data_blkaddr(blkaddr)) {
+ if (!cluster_end)
+ cluster_end = i;
+ continue;
+ }
+ /* [COMPR_ADDR, NULL_ADDR or NEW_ADDR, valid_blkaddr] */
+ if (cluster_end) {
+ reason = "[C|N|N|V]";
+ goto out;
+ }
+ }
+ return false;
+out:
+ f2fs_warn(sbi, "access invalid cluster, ino:%lu, nid:%u, ofs_in_node:%u, reason:%s",
+ dn->inode->i_ino, dn->nid, dn->ofs_in_node, reason);
+ set_sbi_flag(sbi, SBI_NEED_FSCK);
+ return true;
+}
+
+static int __f2fs_cluster_blocks(struct inode *inode,
+ unsigned int cluster_idx, bool compr)
+{
+ struct dnode_of_data dn;
+ unsigned int cluster_size = F2FS_I(inode)->i_cluster_size;
+ unsigned int start_idx = cluster_idx <<
+ F2FS_I(inode)->i_log_cluster_size;
+ int ret;
+
+ set_new_dnode(&dn, inode, NULL, NULL, 0);
+ ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
+ if (ret) {
+ if (ret == -ENOENT)
+ ret = 0;
+ goto fail;
+ }
+
+ if (f2fs_sanity_check_cluster(&dn)) {
+ ret = -EFSCORRUPTED;
+ f2fs_handle_error(F2FS_I_SB(inode), ERROR_CORRUPTED_CLUSTER);
+ goto fail;
+ }
+
+ if (dn.data_blkaddr == COMPRESS_ADDR) {
+ int i;
+
+ ret = 1;
+ for (i = 1; i < cluster_size; i++) {
+ block_t blkaddr;
+
+ blkaddr = data_blkaddr(dn.inode,
+ dn.node_page, dn.ofs_in_node + i);
+ if (compr) {
+ if (__is_valid_data_blkaddr(blkaddr))
+ ret++;
+ } else {
+ if (blkaddr != NULL_ADDR)
+ ret++;
+ }
+ }
+
+ f2fs_bug_on(F2FS_I_SB(inode),
+ !compr && ret != cluster_size &&
+ !is_inode_flag_set(inode, FI_COMPRESS_RELEASED));
+ }
+fail:
+ f2fs_put_dnode(&dn);
+ return ret;
+}
+
+/* return # of compressed blocks in compressed cluster */
+static int f2fs_compressed_blocks(struct compress_ctx *cc)
+{
+ return __f2fs_cluster_blocks(cc->inode, cc->cluster_idx, true);
+}
+
+/* return # of valid blocks in compressed cluster */
+int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
+{
+ return __f2fs_cluster_blocks(inode,
+ index >> F2FS_I(inode)->i_log_cluster_size,
+ false);
+}
+
+static bool cluster_may_compress(struct compress_ctx *cc)
+{
+ if (!f2fs_need_compress_data(cc->inode))
+ return false;
+ if (f2fs_is_atomic_file(cc->inode))
+ return false;
+ if (!f2fs_cluster_is_full(cc))
+ return false;
+ if (unlikely(f2fs_cp_error(F2FS_I_SB(cc->inode))))
+ return false;
+ return !cluster_has_invalid_data(cc);
+}
+
+static void set_cluster_writeback(struct compress_ctx *cc)
+{
+ int i;
+
+ for (i = 0; i < cc->cluster_size; i++) {
+ if (cc->rpages[i])
+ set_page_writeback(cc->rpages[i]);
+ }
+}
+
+static void set_cluster_dirty(struct compress_ctx *cc)
+{
+ int i;
+
+ for (i = 0; i < cc->cluster_size; i++)
+ if (cc->rpages[i])
+ set_page_dirty(cc->rpages[i]);
+}
+
+static int prepare_compress_overwrite(struct compress_ctx *cc,
+ struct page **pagep, pgoff_t index, void **fsdata)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
+ struct address_space *mapping = cc->inode->i_mapping;
+ struct page *page;
+ sector_t last_block_in_bio;
+ unsigned fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
+ pgoff_t start_idx = start_idx_of_cluster(cc);
+ int i, ret;
+
+retry:
+ ret = f2fs_is_compressed_cluster(cc->inode, start_idx);
+ if (ret <= 0)
+ return ret;
+
+ ret = f2fs_init_compress_ctx(cc);
+ if (ret)
+ return ret;
+
+ /* keep page reference to avoid page reclaim */
+ for (i = 0; i < cc->cluster_size; i++) {
+ page = f2fs_pagecache_get_page(mapping, start_idx + i,
+ fgp_flag, GFP_NOFS);
+ if (!page) {
+ ret = -ENOMEM;
+ goto unlock_pages;
+ }
+
+ if (PageUptodate(page))
+ f2fs_put_page(page, 1);
+ else
+ f2fs_compress_ctx_add_page(cc, page);
+ }
+
+ if (!f2fs_cluster_is_empty(cc)) {
+ struct bio *bio = NULL;
+
+ ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
+ &last_block_in_bio, false, true);
+ f2fs_put_rpages(cc);
+ f2fs_destroy_compress_ctx(cc, true);
+ if (ret)
+ goto out;
+ if (bio)
+ f2fs_submit_bio(sbi, bio, DATA);
+
+ ret = f2fs_init_compress_ctx(cc);
+ if (ret)
+ goto out;
+ }
+
+ for (i = 0; i < cc->cluster_size; i++) {
+ f2fs_bug_on(sbi, cc->rpages[i]);
+
+ page = find_lock_page(mapping, start_idx + i);
+ if (!page) {
+ /* page can be truncated */
+ goto release_and_retry;
+ }
+
+ f2fs_wait_on_page_writeback(page, DATA, true, true);
+ f2fs_compress_ctx_add_page(cc, page);
+
+ if (!PageUptodate(page)) {
+release_and_retry:
+ f2fs_put_rpages(cc);
+ f2fs_unlock_rpages(cc, i + 1);
+ f2fs_destroy_compress_ctx(cc, true);
+ goto retry;
+ }
+ }
+
+ if (likely(!ret)) {
+ *fsdata = cc->rpages;
+ *pagep = cc->rpages[offset_in_cluster(cc, index)];
+ return cc->cluster_size;
+ }
+
+unlock_pages:
+ f2fs_put_rpages(cc);
+ f2fs_unlock_rpages(cc, i);
+ f2fs_destroy_compress_ctx(cc, true);
+out:
+ return ret;
+}
+
+int f2fs_prepare_compress_overwrite(struct inode *inode,
+ struct page **pagep, pgoff_t index, void **fsdata)
+{
+ struct compress_ctx cc = {
+ .inode = inode,
+ .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
+ .cluster_size = F2FS_I(inode)->i_cluster_size,
+ .cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size,
+ .rpages = NULL,
+ .nr_rpages = 0,
+ };
+
+ return prepare_compress_overwrite(&cc, pagep, index, fsdata);
+}
+
+bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
+ pgoff_t index, unsigned copied)
+
+{
+ struct compress_ctx cc = {
+ .inode = inode,
+ .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
+ .cluster_size = F2FS_I(inode)->i_cluster_size,
+ .rpages = fsdata,
+ };
+ bool first_index = (index == cc.rpages[0]->index);
+
+ if (copied)
+ set_cluster_dirty(&cc);
+
+ f2fs_put_rpages_wbc(&cc, NULL, false, 1);
+ f2fs_destroy_compress_ctx(&cc, false);
+
+ return first_index;
+}
+
+int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)
+{
+ void *fsdata = NULL;
+ struct page *pagep;
+ int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
+ pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<
+ log_cluster_size;
+ int err;
+
+ err = f2fs_is_compressed_cluster(inode, start_idx);
+ if (err < 0)
+ return err;
+
+ /* truncate normal cluster */
+ if (!err)
+ return f2fs_do_truncate_blocks(inode, from, lock);
+
+ /* truncate compressed cluster */
+ err = f2fs_prepare_compress_overwrite(inode, &pagep,
+ start_idx, &fsdata);
+
+ /* should not be a normal cluster */
+ f2fs_bug_on(F2FS_I_SB(inode), err == 0);
+
+ if (err <= 0)
+ return err;
+
+ if (err > 0) {
+ struct page **rpages = fsdata;
+ int cluster_size = F2FS_I(inode)->i_cluster_size;
+ int i;
+
+ for (i = cluster_size - 1; i >= 0; i--) {
+ loff_t start = rpages[i]->index << PAGE_SHIFT;
+
+ if (from <= start) {
+ zero_user_segment(rpages[i], 0, PAGE_SIZE);
+ } else {
+ zero_user_segment(rpages[i], from - start,
+ PAGE_SIZE);
+ break;
+ }
+ }
+
+ f2fs_compress_write_end(inode, fsdata, start_idx, true);
+ }
+ return 0;
+}
+
+static int f2fs_write_compressed_pages(struct compress_ctx *cc,
+ int *submitted,
+ struct writeback_control *wbc,
+ enum iostat_type io_type)
+{
+ struct inode *inode = cc->inode;
+ struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+ struct f2fs_inode_info *fi = F2FS_I(inode);
+ struct f2fs_io_info fio = {
+ .sbi = sbi,
+ .ino = cc->inode->i_ino,
+ .type = DATA,
+ .op = REQ_OP_WRITE,
+ .op_flags = wbc_to_write_flags(wbc),
+ .old_blkaddr = NEW_ADDR,
+ .page = NULL,
+ .encrypted_page = NULL,
+ .compressed_page = NULL,
+ .submitted = false,
+ .io_type = io_type,
+ .io_wbc = wbc,
+ .encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode),
+ };
+ struct dnode_of_data dn;
+ struct node_info ni;
+ struct compress_io_ctx *cic;
+ pgoff_t start_idx = start_idx_of_cluster(cc);
+ unsigned int last_index = cc->cluster_size - 1;
+ loff_t psize;
+ int i, err;
+ bool quota_inode = IS_NOQUOTA(inode);
+
+ /* we should bypass data pages to proceed the kworkder jobs */
+ if (unlikely(f2fs_cp_error(sbi))) {
+ mapping_set_error(cc->rpages[0]->mapping, -EIO);
+ goto out_free;
+ }
+
+ if (quota_inode) {
+ /*
+ * We need to wait for node_write to avoid block allocation during
+ * checkpoint. This can only happen to quota writes which can cause
+ * the below discard race condition.
+ */
+ f2fs_down_read(&sbi->node_write);
+ } else if (!f2fs_trylock_op(sbi)) {
+ goto out_free;
+ }
+
+ set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
+
+ err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
+ if (err)
+ goto out_unlock_op;
+
+ for (i = 0; i < cc->cluster_size; i++) {
+ if (data_blkaddr(dn.inode, dn.node_page,
+ dn.ofs_in_node + i) == NULL_ADDR)
+ goto out_put_dnode;
+ }
+
+ psize = (loff_t)(cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
+
+ err = f2fs_get_node_info(fio.sbi, dn.nid, &ni, false);
+ if (err)
+ goto out_put_dnode;
+
+ fio.version = ni.version;
+
+ cic = f2fs_kmem_cache_alloc(cic_entry_slab, GFP_F2FS_ZERO, false, sbi);
+ if (!cic)
+ goto out_put_dnode;
+
+ cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
+ cic->inode = inode;
+ atomic_set(&cic->pending_pages, cc->valid_nr_cpages);
+ cic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
+ if (!cic->rpages)
+ goto out_put_cic;
+
+ cic->nr_rpages = cc->cluster_size;
+
+ for (i = 0; i < cc->valid_nr_cpages; i++) {
+ f2fs_set_compressed_page(cc->cpages[i], inode,
+ cc->rpages[i + 1]->index, cic);
+ fio.compressed_page = cc->cpages[i];
+
+ fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_page,
+ dn.ofs_in_node + i + 1);
+
+ /* wait for GCed page writeback via META_MAPPING */
+ f2fs_wait_on_block_writeback(inode, fio.old_blkaddr);
+
+ if (fio.encrypted) {
+ fio.page = cc->rpages[i + 1];
+ err = f2fs_encrypt_one_page(&fio);
+ if (err)
+ goto out_destroy_crypt;
+ cc->cpages[i] = fio.encrypted_page;
+ }
+ }
+
+ set_cluster_writeback(cc);
+
+ for (i = 0; i < cc->cluster_size; i++)
+ cic->rpages[i] = cc->rpages[i];
+
+ for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
+ block_t blkaddr;
+
+ blkaddr = f2fs_data_blkaddr(&dn);
+ fio.page = cc->rpages[i];
+ fio.old_blkaddr = blkaddr;
+
+ /* cluster header */
+ if (i == 0) {
+ if (blkaddr == COMPRESS_ADDR)
+ fio.compr_blocks++;
+ if (__is_valid_data_blkaddr(blkaddr))
+ f2fs_invalidate_blocks(sbi, blkaddr);
+ f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
+ goto unlock_continue;
+ }
+
+ if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
+ fio.compr_blocks++;
+
+ if (i > cc->valid_nr_cpages) {
+ if (__is_valid_data_blkaddr(blkaddr)) {
+ f2fs_invalidate_blocks(sbi, blkaddr);
+ f2fs_update_data_blkaddr(&dn, NEW_ADDR);
+ }
+ goto unlock_continue;
+ }
+
+ f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
+
+ if (fio.encrypted)
+ fio.encrypted_page = cc->cpages[i - 1];
+ else
+ fio.compressed_page = cc->cpages[i - 1];
+
+ cc->cpages[i - 1] = NULL;
+ f2fs_outplace_write_data(&dn, &fio);
+ (*submitted)++;
+unlock_continue:
+ inode_dec_dirty_pages(cc->inode);
+ unlock_page(fio.page);
+ }
+
+ if (fio.compr_blocks)
+ f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
+ f2fs_i_compr_blocks_update(inode, cc->valid_nr_cpages, true);
+ add_compr_block_stat(inode, cc->valid_nr_cpages);
+
+ set_inode_flag(cc->inode, FI_APPEND_WRITE);
+ if (cc->cluster_idx == 0)
+ set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
+
+ f2fs_put_dnode(&dn);
+ if (quota_inode)
+ f2fs_up_read(&sbi->node_write);
+ else
+ f2fs_unlock_op(sbi);
+
+ spin_lock(&fi->i_size_lock);
+ if (fi->last_disk_size < psize)
+ fi->last_disk_size = psize;
+ spin_unlock(&fi->i_size_lock);
+
+ f2fs_put_rpages(cc);
+ page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
+ cc->cpages = NULL;
+ f2fs_destroy_compress_ctx(cc, false);
+ return 0;
+
+out_destroy_crypt:
+ page_array_free(cc->inode, cic->rpages, cc->cluster_size);
+
+ for (--i; i >= 0; i--)
+ fscrypt_finalize_bounce_page(&cc->cpages[i]);
+out_put_cic:
+ kmem_cache_free(cic_entry_slab, cic);
+out_put_dnode:
+ f2fs_put_dnode(&dn);
+out_unlock_op:
+ if (quota_inode)
+ f2fs_up_read(&sbi->node_write);
+ else
+ f2fs_unlock_op(sbi);
+out_free:
+ for (i = 0; i < cc->valid_nr_cpages; i++) {
+ f2fs_compress_free_page(cc->cpages[i]);
+ cc->cpages[i] = NULL;
+ }
+ page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
+ cc->cpages = NULL;
+ return -EAGAIN;
+}
+
+void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
+{
+ struct f2fs_sb_info *sbi = bio->bi_private;
+ struct compress_io_ctx *cic =
+ (struct compress_io_ctx *)page_private(page);
+ int i;
+
+ if (unlikely(bio->bi_status))
+ mapping_set_error(cic->inode->i_mapping, -EIO);
+
+ f2fs_compress_free_page(page);
+
+ dec_page_count(sbi, F2FS_WB_DATA);
+
+ if (atomic_dec_return(&cic->pending_pages))
+ return;
+
+ for (i = 0; i < cic->nr_rpages; i++) {
+ WARN_ON(!cic->rpages[i]);
+ clear_page_private_gcing(cic->rpages[i]);
+ end_page_writeback(cic->rpages[i]);
+ }
+
+ page_array_free(cic->inode, cic->rpages, cic->nr_rpages);
+ kmem_cache_free(cic_entry_slab, cic);
+}
+
+static int f2fs_write_raw_pages(struct compress_ctx *cc,
+ int *submitted,
+ struct writeback_control *wbc,
+ enum iostat_type io_type)
+{
+ struct address_space *mapping = cc->inode->i_mapping;
+ int _submitted, compr_blocks, ret, i;
+
+ compr_blocks = f2fs_compressed_blocks(cc);
+
+ for (i = 0; i < cc->cluster_size; i++) {
+ if (!cc->rpages[i])
+ continue;
+
+ redirty_page_for_writepage(wbc, cc->rpages[i]);
+ unlock_page(cc->rpages[i]);
+ }
+
+ if (compr_blocks < 0)
+ return compr_blocks;
+
+ for (i = 0; i < cc->cluster_size; i++) {
+ if (!cc->rpages[i])
+ continue;
+retry_write:
+ lock_page(cc->rpages[i]);
+
+ if (cc->rpages[i]->mapping != mapping) {
+continue_unlock:
+ unlock_page(cc->rpages[i]);
+ continue;
+ }
+
+ if (!PageDirty(cc->rpages[i]))
+ goto continue_unlock;
+
+ if (PageWriteback(cc->rpages[i])) {
+ if (wbc->sync_mode == WB_SYNC_NONE)
+ goto continue_unlock;
+ f2fs_wait_on_page_writeback(cc->rpages[i], DATA, true, true);
+ }
+
+ if (!clear_page_dirty_for_io(cc->rpages[i]))
+ goto continue_unlock;
+
+ ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
+ NULL, NULL, wbc, io_type,
+ compr_blocks, false);
+ if (ret) {
+ if (ret == AOP_WRITEPAGE_ACTIVATE) {
+ unlock_page(cc->rpages[i]);
+ ret = 0;
+ } else if (ret == -EAGAIN) {
+ /*
+ * for quota file, just redirty left pages to
+ * avoid deadlock caused by cluster update race
+ * from foreground operation.
+ */
+ if (IS_NOQUOTA(cc->inode))
+ return 0;
+ ret = 0;
+ f2fs_io_schedule_timeout(DEFAULT_IO_TIMEOUT);
+ goto retry_write;
+ }
+ return ret;
+ }
+
+ *submitted += _submitted;
+ }
+
+ f2fs_balance_fs(F2FS_M_SB(mapping), true);
+
+ return 0;
+}
+
+int f2fs_write_multi_pages(struct compress_ctx *cc,
+ int *submitted,
+ struct writeback_control *wbc,
+ enum iostat_type io_type)
+{
+ int err;
+
+ *submitted = 0;
+ if (cluster_may_compress(cc)) {
+ err = f2fs_compress_pages(cc);
+ if (err == -EAGAIN) {
+ add_compr_block_stat(cc->inode, cc->cluster_size);
+ goto write;
+ } else if (err) {
+ f2fs_put_rpages_wbc(cc, wbc, true, 1);
+ goto destroy_out;
+ }
+
+ err = f2fs_write_compressed_pages(cc, submitted,
+ wbc, io_type);
+ if (!err)
+ return 0;
+ f2fs_bug_on(F2FS_I_SB(cc->inode), err != -EAGAIN);
+ }
+write:
+ f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
+
+ err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
+ f2fs_put_rpages_wbc(cc, wbc, false, 0);
+destroy_out:
+ f2fs_destroy_compress_ctx(cc, false);
+ return err;
+}
+
+static inline bool allow_memalloc_for_decomp(struct f2fs_sb_info *sbi,
+ bool pre_alloc)
+{
+ return pre_alloc ^ f2fs_low_mem_mode(sbi);
+}
+
+static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic,
+ bool pre_alloc)
+{
+ const struct f2fs_compress_ops *cops =
+ f2fs_cops[F2FS_I(dic->inode)->i_compress_algorithm];
+ int i;
+
+ if (!allow_memalloc_for_decomp(F2FS_I_SB(dic->inode), pre_alloc))
+ return 0;
+
+ dic->tpages = page_array_alloc(dic->inode, dic->cluster_size);
+ if (!dic->tpages)
+ return -ENOMEM;
+
+ for (i = 0; i < dic->cluster_size; i++) {
+ if (dic->rpages[i]) {
+ dic->tpages[i] = dic->rpages[i];
+ continue;
+ }
+
+ dic->tpages[i] = f2fs_compress_alloc_page();
+ if (!dic->tpages[i])
+ return -ENOMEM;
+ }
+
+ dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
+ if (!dic->rbuf)
+ return -ENOMEM;
+
+ dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
+ if (!dic->cbuf)
+ return -ENOMEM;
+
+ if (cops->init_decompress_ctx)
+ return cops->init_decompress_ctx(dic);
+
+ return 0;
+}
+
+static void f2fs_release_decomp_mem(struct decompress_io_ctx *dic,
+ bool bypass_destroy_callback, bool pre_alloc)
+{
+ const struct f2fs_compress_ops *cops =
+ f2fs_cops[F2FS_I(dic->inode)->i_compress_algorithm];
+
+ if (!allow_memalloc_for_decomp(F2FS_I_SB(dic->inode), pre_alloc))
+ return;
+
+ if (!bypass_destroy_callback && cops->destroy_decompress_ctx)
+ cops->destroy_decompress_ctx(dic);
+
+ if (dic->cbuf)
+ vm_unmap_ram(dic->cbuf, dic->nr_cpages);
+
+ if (dic->rbuf)
+ vm_unmap_ram(dic->rbuf, dic->cluster_size);
+}
+
+static void f2fs_free_dic(struct decompress_io_ctx *dic,
+ bool bypass_destroy_callback);
+
+struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
+{
+ struct decompress_io_ctx *dic;
+ pgoff_t start_idx = start_idx_of_cluster(cc);
+ struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
+ int i, ret;
+
+ dic = f2fs_kmem_cache_alloc(dic_entry_slab, GFP_F2FS_ZERO, false, sbi);
+ if (!dic)
+ return ERR_PTR(-ENOMEM);
+
+ dic->rpages = page_array_alloc(cc->inode, cc->cluster_size);
+ if (!dic->rpages) {
+ kmem_cache_free(dic_entry_slab, dic);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ dic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
+ dic->inode = cc->inode;
+ atomic_set(&dic->remaining_pages, cc->nr_cpages);
+ dic->cluster_idx = cc->cluster_idx;
+ dic->cluster_size = cc->cluster_size;
+ dic->log_cluster_size = cc->log_cluster_size;
+ dic->nr_cpages = cc->nr_cpages;
+ refcount_set(&dic->refcnt, 1);
+ dic->failed = false;
+ dic->need_verity = f2fs_need_verity(cc->inode, start_idx);
+
+ for (i = 0; i < dic->cluster_size; i++)
+ dic->rpages[i] = cc->rpages[i];
+ dic->nr_rpages = cc->cluster_size;
+
+ dic->cpages = page_array_alloc(dic->inode, dic->nr_cpages);
+ if (!dic->cpages) {
+ ret = -ENOMEM;
+ goto out_free;
+ }
+
+ for (i = 0; i < dic->nr_cpages; i++) {
+ struct page *page;
+
+ page = f2fs_compress_alloc_page();
+ if (!page) {
+ ret = -ENOMEM;
+ goto out_free;
+ }
+
+ f2fs_set_compressed_page(page, cc->inode,
+ start_idx + i + 1, dic);
+ dic->cpages[i] = page;
+ }
+
+ ret = f2fs_prepare_decomp_mem(dic, true);
+ if (ret)
+ goto out_free;
+
+ return dic;
+
+out_free:
+ f2fs_free_dic(dic, true);
+ return ERR_PTR(ret);
+}
+
+static void f2fs_free_dic(struct decompress_io_ctx *dic,
+ bool bypass_destroy_callback)
+{
+ int i;
+
+ f2fs_release_decomp_mem(dic, bypass_destroy_callback, true);
+
+ if (dic->tpages) {
+ for (i = 0; i < dic->cluster_size; i++) {
+ if (dic->rpages[i])
+ continue;
+ if (!dic->tpages[i])
+ continue;
+ f2fs_compress_free_page(dic->tpages[i]);
+ }
+ page_array_free(dic->inode, dic->tpages, dic->cluster_size);
+ }
+
+ if (dic->cpages) {
+ for (i = 0; i < dic->nr_cpages; i++) {
+ if (!dic->cpages[i])
+ continue;
+ f2fs_compress_free_page(dic->cpages[i]);
+ }
+ page_array_free(dic->inode, dic->cpages, dic->nr_cpages);
+ }
+
+ page_array_free(dic->inode, dic->rpages, dic->nr_rpages);
+ kmem_cache_free(dic_entry_slab, dic);
+}
+
+static void f2fs_late_free_dic(struct work_struct *work)
+{
+ struct decompress_io_ctx *dic =
+ container_of(work, struct decompress_io_ctx, free_work);
+
+ f2fs_free_dic(dic, false);
+}
+
+static void f2fs_put_dic(struct decompress_io_ctx *dic, bool in_task)
+{
+ if (refcount_dec_and_test(&dic->refcnt)) {
+ if (in_task) {
+ f2fs_free_dic(dic, false);
+ } else {
+ INIT_WORK(&dic->free_work, f2fs_late_free_dic);
+ queue_work(F2FS_I_SB(dic->inode)->post_read_wq,
+ &dic->free_work);
+ }
+ }
+}
+
+/*
+ * Update and unlock the cluster's pagecache pages, and release the reference to
+ * the decompress_io_ctx that was being held for I/O completion.
+ */
+static void __f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed,
+ bool in_task)
+{
+ int i;
+
+ for (i = 0; i < dic->cluster_size; i++) {
+ struct page *rpage = dic->rpages[i];
+
+ if (!rpage)
+ continue;
+
+ /* PG_error was set if verity failed. */
+ if (failed || PageError(rpage)) {
+ ClearPageUptodate(rpage);
+ /* will re-read again later */
+ ClearPageError(rpage);
+ } else {
+ SetPageUptodate(rpage);
+ }
+ unlock_page(rpage);
+ }
+
+ f2fs_put_dic(dic, in_task);
+}
+
+static void f2fs_verify_cluster(struct work_struct *work)
+{
+ struct decompress_io_ctx *dic =
+ container_of(work, struct decompress_io_ctx, verity_work);
+ int i;
+
+ /* Verify the cluster's decompressed pages with fs-verity. */
+ for (i = 0; i < dic->cluster_size; i++) {
+ struct page *rpage = dic->rpages[i];
+
+ if (rpage && !fsverity_verify_page(rpage))
+ SetPageError(rpage);
+ }
+
+ __f2fs_decompress_end_io(dic, false, true);
+}
+
+/*
+ * This is called when a compressed cluster has been decompressed
+ * (or failed to be read and/or decompressed).
+ */
+void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed,
+ bool in_task)
+{
+ if (!failed && dic->need_verity) {
+ /*
+ * Note that to avoid deadlocks, the verity work can't be done
+ * on the decompression workqueue. This is because verifying
+ * the data pages can involve reading metadata pages from the
+ * file, and these metadata pages may be compressed.
+ */
+ INIT_WORK(&dic->verity_work, f2fs_verify_cluster);
+ fsverity_enqueue_verify_work(&dic->verity_work);
+ } else {
+ __f2fs_decompress_end_io(dic, failed, in_task);
+ }
+}
+
+/*
+ * Put a reference to a compressed page's decompress_io_ctx.
+ *
+ * This is called when the page is no longer needed and can be freed.
+ */
+void f2fs_put_page_dic(struct page *page, bool in_task)
+{
+ struct decompress_io_ctx *dic =
+ (struct decompress_io_ctx *)page_private(page);
+
+ f2fs_put_dic(dic, in_task);
+}
+
+/*
+ * check whether cluster blocks are contiguous, and add extent cache entry
+ * only if cluster blocks are logically and physically contiguous.
+ */
+unsigned int f2fs_cluster_blocks_are_contiguous(struct dnode_of_data *dn)
+{
+ bool compressed = f2fs_data_blkaddr(dn) == COMPRESS_ADDR;
+ int i = compressed ? 1 : 0;
+ block_t first_blkaddr = data_blkaddr(dn->inode, dn->node_page,
+ dn->ofs_in_node + i);
+
+ for (i += 1; i < F2FS_I(dn->inode)->i_cluster_size; i++) {
+ block_t blkaddr = data_blkaddr(dn->inode, dn->node_page,
+ dn->ofs_in_node + i);
+
+ if (!__is_valid_data_blkaddr(blkaddr))
+ break;
+ if (first_blkaddr + i - (compressed ? 1 : 0) != blkaddr)
+ return 0;
+ }
+
+ return compressed ? i - 1 : i;
+}
+
+const struct address_space_operations f2fs_compress_aops = {
+ .release_folio = f2fs_release_folio,
+ .invalidate_folio = f2fs_invalidate_folio,
+};
+
+struct address_space *COMPRESS_MAPPING(struct f2fs_sb_info *sbi)
+{
+ return sbi->compress_inode->i_mapping;
+}
+
+void f2fs_invalidate_compress_page(struct f2fs_sb_info *sbi, block_t blkaddr)
+{
+ if (!sbi->compress_inode)
+ return;
+ invalidate_mapping_pages(COMPRESS_MAPPING(sbi), blkaddr, blkaddr);
+}
+
+void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
+ nid_t ino, block_t blkaddr)
+{
+ struct page *cpage;
+ int ret;
+
+ if (!test_opt(sbi, COMPRESS_CACHE))
+ return;
+
+ if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ))
+ return;
+
+ if (!f2fs_available_free_memory(sbi, COMPRESS_PAGE))
+ return;
+
+ cpage = find_get_page(COMPRESS_MAPPING(sbi), blkaddr);
+ if (cpage) {
+ f2fs_put_page(cpage, 0);
+ return;
+ }
+
+ cpage = alloc_page(__GFP_NOWARN | __GFP_IO);
+ if (!cpage)
+ return;
+
+ ret = add_to_page_cache_lru(cpage, COMPRESS_MAPPING(sbi),
+ blkaddr, GFP_NOFS);
+ if (ret) {
+ f2fs_put_page(cpage, 0);
+ return;
+ }
+
+ set_page_private_data(cpage, ino);
+
+ if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ))
+ goto out;
+
+ memcpy(page_address(cpage), page_address(page), PAGE_SIZE);
+ SetPageUptodate(cpage);
+out:
+ f2fs_put_page(cpage, 1);
+}
+
+bool f2fs_load_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
+ block_t blkaddr)
+{
+ struct page *cpage;
+ bool hitted = false;
+
+ if (!test_opt(sbi, COMPRESS_CACHE))
+ return false;
+
+ cpage = f2fs_pagecache_get_page(COMPRESS_MAPPING(sbi),
+ blkaddr, FGP_LOCK | FGP_NOWAIT, GFP_NOFS);
+ if (cpage) {
+ if (PageUptodate(cpage)) {
+ atomic_inc(&sbi->compress_page_hit);
+ memcpy(page_address(page),
+ page_address(cpage), PAGE_SIZE);
+ hitted = true;
+ }
+ f2fs_put_page(cpage, 1);
+ }
+
+ return hitted;
+}
+
+void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi, nid_t ino)
+{
+ struct address_space *mapping = COMPRESS_MAPPING(sbi);
+ struct folio_batch fbatch;
+ pgoff_t index = 0;
+ pgoff_t end = MAX_BLKADDR(sbi);
+
+ if (!mapping->nrpages)
+ return;
+
+ folio_batch_init(&fbatch);
+
+ do {
+ unsigned int nr, i;
+
+ nr = filemap_get_folios(mapping, &index, end - 1, &fbatch);
+ if (!nr)
+ break;
+
+ for (i = 0; i < nr; i++) {
+ struct folio *folio = fbatch.folios[i];
+
+ folio_lock(folio);
+ if (folio->mapping != mapping) {
+ folio_unlock(folio);
+ continue;
+ }
+
+ if (ino != get_page_private_data(&folio->page)) {
+ folio_unlock(folio);
+ continue;
+ }
+
+ generic_error_remove_page(mapping, &folio->page);
+ folio_unlock(folio);
+ }
+ folio_batch_release(&fbatch);
+ cond_resched();
+ } while (index < end);
+}
+
+int f2fs_init_compress_inode(struct f2fs_sb_info *sbi)
+{
+ struct inode *inode;
+
+ if (!test_opt(sbi, COMPRESS_CACHE))
+ return 0;
+
+ inode = f2fs_iget(sbi->sb, F2FS_COMPRESS_INO(sbi));
+ if (IS_ERR(inode))
+ return PTR_ERR(inode);
+ sbi->compress_inode = inode;
+
+ sbi->compress_percent = COMPRESS_PERCENT;
+ sbi->compress_watermark = COMPRESS_WATERMARK;
+
+ atomic_set(&sbi->compress_page_hit, 0);
+
+ return 0;
+}
+
+void f2fs_destroy_compress_inode(struct f2fs_sb_info *sbi)
+{
+ if (!sbi->compress_inode)
+ return;
+ iput(sbi->compress_inode);
+ sbi->compress_inode = NULL;
+}
+
+int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
+{
+ dev_t dev = sbi->sb->s_bdev->bd_dev;
+ char slab_name[35];
+
+ if (!f2fs_sb_has_compression(sbi))
+ return 0;
+
+ sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
+
+ sbi->page_array_slab_size = sizeof(struct page *) <<
+ F2FS_OPTION(sbi).compress_log_size;
+
+ sbi->page_array_slab = f2fs_kmem_cache_create(slab_name,
+ sbi->page_array_slab_size);
+ if (!sbi->page_array_slab)
+ return -ENOMEM;
+ return 0;
+}
+
+void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
+{
+ kmem_cache_destroy(sbi->page_array_slab);
+}
+
+static int __init f2fs_init_cic_cache(void)
+{
+ cic_entry_slab = f2fs_kmem_cache_create("f2fs_cic_entry",
+ sizeof(struct compress_io_ctx));
+ if (!cic_entry_slab)
+ return -ENOMEM;
+ return 0;
+}
+
+static void f2fs_destroy_cic_cache(void)
+{
+ kmem_cache_destroy(cic_entry_slab);
+}
+
+static int __init f2fs_init_dic_cache(void)
+{
+ dic_entry_slab = f2fs_kmem_cache_create("f2fs_dic_entry",
+ sizeof(struct decompress_io_ctx));
+ if (!dic_entry_slab)
+ return -ENOMEM;
+ return 0;
+}
+
+static void f2fs_destroy_dic_cache(void)
+{
+ kmem_cache_destroy(dic_entry_slab);
+}
+
+int __init f2fs_init_compress_cache(void)
+{
+ int err;
+
+ err = f2fs_init_cic_cache();
+ if (err)
+ goto out;
+ err = f2fs_init_dic_cache();
+ if (err)
+ goto free_cic;
+ return 0;
+free_cic:
+ f2fs_destroy_cic_cache();
+out:
+ return -ENOMEM;
+}
+
+void f2fs_destroy_compress_cache(void)
+{
+ f2fs_destroy_dic_cache();
+ f2fs_destroy_cic_cache();
+}