Update Linux to v5.10.109
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.109.tar.xz
Change-Id: I19bca9fc6762d4e63bcf3e4cba88bbe560d9c76c
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
new file mode 100644
index 0000000..ec542e8
--- /dev/null
+++ b/fs/f2fs/compress.c
@@ -0,0 +1,1640 @@
+// 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/writeback.h>
+#include <linux/backing-dev.h>
+#include <linux/lzo.h>
+#include <linux/lz4.h>
+#include <linux/zstd.h>
+
+#include "f2fs.h"
+#include "node.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 kmem_cache_zalloc(sbi->page_array_slab, GFP_NOFS);
+ 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 (IS_ATOMIC_WRITTEN_PAGE(page) || IS_DUMMY_WRITTEN_PAGE(page))
+ return false;
+ /*
+ * page->private may be set with pid.
+ * pid_max is enough to check if it is traced.
+ */
+ if (IS_IO_TRACED_PAGE(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)
+{
+ SetPagePrivate(page);
+ set_page_private(page, (unsigned long)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;
+ 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)
+{
+ cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
+ LZ4_MEM_COMPRESS, 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;
+}
+
+static int lz4_compress_pages(struct compress_ctx *cc)
+{
+ int len;
+
+ 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 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_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
+#define F2FS_ZSTD_DEFAULT_CLEVEL 1
+
+static int zstd_init_compress_ctx(struct compress_ctx *cc)
+{
+ ZSTD_parameters params;
+ ZSTD_CStream *stream;
+ void *workspace;
+ unsigned int workspace_size;
+
+ params = ZSTD_getParams(F2FS_ZSTD_DEFAULT_CLEVEL, cc->rlen, 0);
+ workspace_size = ZSTD_CStreamWorkspaceBound(params.cParams);
+
+ workspace = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
+ workspace_size, GFP_NOFS);
+ if (!workspace)
+ return -ENOMEM;
+
+ stream = ZSTD_initCStream(params, 0, workspace, workspace_size);
+ if (!stream) {
+ printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initCStream 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_inBuffer inbuf;
+ ZSTD_outBuffer 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_compressStream(stream, &outbuf, &inbuf);
+ if (ZSTD_isError(ret)) {
+ printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
+ KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
+ __func__, ZSTD_getErrorCode(ret));
+ return -EIO;
+ }
+
+ ret = ZSTD_endStream(stream, &outbuf);
+ if (ZSTD_isError(ret)) {
+ printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_endStream returned %d\n",
+ KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id,
+ __func__, ZSTD_getErrorCode(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_DStreamWorkspaceBound(max_window_size);
+
+ workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
+ workspace_size, GFP_NOFS);
+ if (!workspace)
+ return -ENOMEM;
+
+ stream = ZSTD_initDStream(max_window_size, workspace, workspace_size);
+ if (!stream) {
+ printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_initDStream 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_inBuffer inbuf;
+ ZSTD_outBuffer 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_decompressStream(stream, &outbuf, &inbuf);
+ if (ZSTD_isError(ret)) {
+ printk_ratelimited("%sF2FS-fs (%s): %s ZSTD_compressStream failed, ret: %d\n",
+ KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id,
+ __func__, ZSTD_getErrorCode(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;
+ set_page_private(page, (unsigned long)NULL);
+ ClearPagePrivate(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;
+ struct page **new_cpages;
+ 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->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);
+
+ 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);
+
+ /* Now we're going to cut unnecessary tail pages */
+ new_cpages = page_array_alloc(cc->inode, new_nr_cpages);
+ if (!new_cpages) {
+ ret = -ENOMEM;
+ goto out_vunmap_cbuf;
+ }
+
+ /* 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) {
+ new_cpages[i] = cc->cpages[i];
+ continue;
+ }
+ f2fs_compress_free_page(cc->cpages[i]);
+ cc->cpages[i] = NULL;
+ }
+
+ if (cops->destroy_compress_ctx)
+ cops->destroy_compress_ctx(cc);
+
+ page_array_free(cc->inode, cc->cpages, cc->nr_cpages);
+ cc->cpages = new_cpages;
+ cc->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;
+}
+
+void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
+{
+ struct decompress_io_ctx *dic =
+ (struct decompress_io_ctx *)page_private(page);
+ 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];
+ int ret;
+ int i;
+
+ dec_page_count(sbi, F2FS_RD_DATA);
+
+ if (bio->bi_status || PageError(page))
+ dic->failed = true;
+
+ if (atomic_dec_return(&dic->pending_pages))
+ return;
+
+ trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
+ dic->cluster_size, fi->i_compress_algorithm);
+
+ /* submit partial compressed pages */
+ if (dic->failed) {
+ ret = -EIO;
+ goto out_free_dic;
+ }
+
+ dic->tpages = page_array_alloc(dic->inode, dic->cluster_size);
+ if (!dic->tpages) {
+ ret = -ENOMEM;
+ goto out_free_dic;
+ }
+
+ 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]) {
+ ret = -ENOMEM;
+ goto out_free_dic;
+ }
+ }
+
+ if (cops->init_decompress_ctx) {
+ ret = cops->init_decompress_ctx(dic);
+ if (ret)
+ goto out_free_dic;
+ }
+
+ dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
+ if (!dic->rbuf) {
+ ret = -ENOMEM;
+ goto destroy_decompress_ctx;
+ }
+
+ dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
+ if (!dic->cbuf) {
+ ret = -ENOMEM;
+ goto out_vunmap_rbuf;
+ }
+
+ 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;
+ goto out_vunmap_cbuf;
+ }
+
+ ret = cops->decompress_pages(dic);
+
+out_vunmap_cbuf:
+ vm_unmap_ram(dic->cbuf, dic->nr_cpages);
+out_vunmap_rbuf:
+ vm_unmap_ram(dic->rbuf, dic->cluster_size);
+destroy_decompress_ctx:
+ if (cops->destroy_decompress_ctx)
+ cops->destroy_decompress_ctx(dic);
+out_free_dic:
+ if (!verity)
+ f2fs_decompress_end_io(dic->rpages, dic->cluster_size,
+ ret, false);
+
+ trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
+ dic->clen, ret);
+ if (!verity)
+ f2fs_free_dic(dic);
+}
+
+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);
+}
+
+static bool __cluster_may_compress(struct compress_ctx *cc)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
+ 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(sbi, !page);
+
+ if (unlikely(f2fs_cp_error(sbi)))
+ return false;
+ if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
+ return false;
+
+ /* beyond EOF */
+ if (page->index >= nr_pages)
+ return false;
+ }
+ return true;
+}
+
+static int __f2fs_cluster_blocks(struct compress_ctx *cc, bool compr)
+{
+ struct dnode_of_data dn;
+ int ret;
+
+ set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
+ ret = f2fs_get_dnode_of_data(&dn, start_idx_of_cluster(cc),
+ LOOKUP_NODE);
+ if (ret) {
+ if (ret == -ENOENT)
+ ret = 0;
+ goto fail;
+ }
+
+ if (dn.data_blkaddr == COMPRESS_ADDR) {
+ int i;
+
+ ret = 1;
+ for (i = 1; i < cc->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++;
+ }
+ }
+ }
+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, true);
+}
+
+/* return # of valid blocks in compressed cluster */
+static int f2fs_cluster_blocks(struct compress_ctx *cc)
+{
+ return __f2fs_cluster_blocks(cc, false);
+}
+
+int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
+{
+ 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,
+ };
+
+ return f2fs_cluster_blocks(&cc);
+}
+
+static bool cluster_may_compress(struct compress_ctx *cc)
+{
+ if (!f2fs_compressed_file(cc->inode))
+ return false;
+ if (f2fs_is_atomic_file(cc->inode))
+ return false;
+ if (f2fs_is_mmap_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_may_compress(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;
+ struct dnode_of_data dn;
+ 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;
+ bool prealloc;
+
+retry:
+ ret = f2fs_cluster_blocks(cc);
+ if (ret <= 0)
+ return ret;
+
+ /* compressed case */
+ prealloc = (ret < cc->cluster_size);
+
+ 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 (prealloc) {
+ f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true);
+
+ set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
+
+ for (i = cc->cluster_size - 1; i > 0; i--) {
+ ret = f2fs_get_block(&dn, start_idx + i);
+ if (ret) {
+ i = cc->cluster_size;
+ break;
+ }
+
+ if (dn.data_blkaddr != NEW_ADDR)
+ break;
+ }
+
+ f2fs_do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false);
+ }
+
+ 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;
+
+ if (IS_NOQUOTA(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.
+ */
+ 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);
+ if (err)
+ goto out_put_dnode;
+
+ fio.version = ni.version;
+
+ cic = kmem_cache_zalloc(cic_entry_slab, GFP_NOFS);
+ if (!cic)
+ goto out_put_dnode;
+
+ cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
+ cic->inode = inode;
+ atomic_set(&cic->pending_pages, cc->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->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->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->nr_cpages, true);
+
+ 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 (IS_NOQUOTA(inode))
+ 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 (IS_NOQUOTA(inode))
+ up_read(&sbi->node_write);
+ else
+ f2fs_unlock_op(sbi);
+out_free:
+ for (i = 0; i < cc->nr_cpages; i++) {
+ if (!cc->cpages[i])
+ continue;
+ 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_cold_data(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 (!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;
+ cond_resched();
+ congestion_wait(BLK_RW_ASYNC,
+ 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) {
+ 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;
+}
+
+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);
+ int i;
+
+ dic = kmem_cache_zalloc(dic_entry_slab, GFP_NOFS);
+ 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->pending_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;
+ dic->failed = false;
+
+ 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)
+ goto out_free;
+
+ for (i = 0; i < dic->nr_cpages; i++) {
+ struct page *page;
+
+ page = f2fs_compress_alloc_page();
+ if (!page)
+ goto out_free;
+
+ f2fs_set_compressed_page(page, cc->inode,
+ start_idx + i + 1, dic);
+ dic->cpages[i] = page;
+ }
+
+ return dic;
+
+out_free:
+ f2fs_free_dic(dic);
+ return ERR_PTR(-ENOMEM);
+}
+
+void f2fs_free_dic(struct decompress_io_ctx *dic)
+{
+ int i;
+
+ 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);
+}
+
+void f2fs_decompress_end_io(struct page **rpages,
+ unsigned int cluster_size, bool err, bool verity)
+{
+ int i;
+
+ for (i = 0; i < cluster_size; i++) {
+ struct page *rpage = rpages[i];
+
+ if (!rpage)
+ continue;
+
+ if (err || PageError(rpage))
+ goto clear_uptodate;
+
+ if (!verity || fsverity_verify_page(rpage)) {
+ SetPageUptodate(rpage);
+ goto unlock;
+ }
+clear_uptodate:
+ ClearPageUptodate(rpage);
+ ClearPageError(rpage);
+unlock:
+ unlock_page(rpage);
+ }
+}
+
+int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
+{
+ dev_t dev = sbi->sb->s_bdev->bd_dev;
+ char slab_name[32];
+
+ 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();
+}