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- // 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 <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 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 (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;
- 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_flag >> COMPRESS_LEVEL_OFFSET)
- 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_flag >>
- COMPRESS_LEVEL_OFFSET;
- 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
- #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;
- unsigned char level = F2FS_I(cc->inode)->i_compress_flag >>
- COMPRESS_LEVEL_OFFSET;
- if (!level)
- level = F2FS_ZSTD_DEFAULT_CLEVEL;
- params = ZSTD_getParams(level, 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;
- 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;
- struct page **new_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->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 & 1 << 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);
- /* 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_cluster(struct decompress_io_ctx *dic)
- {
- 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;
- 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;
- }
- dic->tpages = page_array_alloc(dic->inode, dic->cluster_size);
- if (!dic->tpages) {
- ret = -ENOMEM;
- goto out_end_io;
- }
- 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_end_io;
- }
- }
- if (cops->init_decompress_ctx) {
- ret = cops->init_decompress_ctx(dic);
- if (ret)
- goto out_end_io;
- }
- dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
- if (!dic->rbuf) {
- ret = -ENOMEM;
- goto out_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);
- if (!ret && (fi->i_compress_flag & 1 << 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_vunmap_cbuf:
- vm_unmap_ram(dic->cbuf, dic->nr_cpages);
- out_vunmap_rbuf:
- vm_unmap_ram(dic->rbuf, dic->cluster_size);
- out_destroy_decompress_ctx:
- if (cops->destroy_decompress_ctx)
- cops->destroy_decompress_ctx(dic);
- out_end_io:
- trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
- dic->clen, ret);
- f2fs_decompress_end_io(dic, ret);
- }
- /*
- * 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)
- {
- 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)
- f2fs_cache_compressed_page(sbi, page,
- dic->inode->i_ino, blkaddr);
- if (atomic_dec_and_test(&dic->remaining_pages))
- f2fs_decompress_cluster(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_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;
- }
- 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 (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;
- /* 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 (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.
- */
- 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 = 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);
- add_compr_block_stat(inode, cc->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 (IS_NOQUOTA(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 (IS_NOQUOTA(inode))
- f2fs_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_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 (!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;
- }
- static void f2fs_free_dic(struct decompress_io_ctx *dic);
- 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->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)
- 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);
- }
- static 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);
- }
- static void f2fs_put_dic(struct decompress_io_ctx *dic)
- {
- if (refcount_dec_and_test(&dic->refcnt))
- f2fs_free_dic(dic);
- }
- /*
- * 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)
- {
- 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);
- }
- 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);
- }
- /*
- * 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)
- {
- 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);
- }
- }
- /*
- * 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)
- {
- struct decompress_io_ctx *dic =
- (struct decompress_io_ctx *)page_private(page);
- f2fs_put_dic(dic);
- }
- const struct address_space_operations f2fs_compress_aops = {
- .releasepage = f2fs_release_page,
- .invalidatepage = f2fs_invalidate_page,
- };
- 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 = sbi->compress_inode->i_mapping;
- struct pagevec pvec;
- pgoff_t index = 0;
- pgoff_t end = MAX_BLKADDR(sbi);
- if (!mapping->nrpages)
- return;
- pagevec_init(&pvec);
- do {
- unsigned int nr_pages;
- int i;
- nr_pages = pagevec_lookup_range(&pvec, mapping,
- &index, end - 1);
- if (!nr_pages)
- break;
- for (i = 0; i < nr_pages; i++) {
- struct page *page = pvec.pages[i];
- if (page->index > end)
- break;
- lock_page(page);
- if (page->mapping != mapping) {
- unlock_page(page);
- continue;
- }
- if (ino != get_page_private_data(page)) {
- unlock_page(page);
- continue;
- }
- generic_error_remove_page(mapping, page);
- unlock_page(page);
- }
- pagevec_release(&pvec);
- 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[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();
- }
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