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compress.c
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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 "f2fs.h"
#include "node.h"
#include <trace/events/f2fs.h>
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;
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_put_compressed_page(struct page *page)
{
set_page_private(page, (unsigned long)NULL);
ClearPagePrivate(page);
page->mapping = NULL;
unlock_page(page);
put_page(page);
}
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_mapping(struct compress_ctx *cc,
struct address_space *mapping,
pgoff_t start, int len)
{
int i;
for (i = 0; i < len; i++) {
struct page *page = find_get_page(mapping, start + i);
put_page(page);
put_page(page);
}
}
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)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
if (cc->nr_rpages)
return 0;
cc->rpages = f2fs_kzalloc(sbi, sizeof(struct page *) <<
cc->log_cluster_size, GFP_NOFS);
return cc->rpages ? 0 : -ENOMEM;
}
void f2fs_destroy_compress_ctx(struct compress_ctx *cc)
{
kfree(cc->rpages);
cc->rpages = NULL;
cc->nr_rpages = 0;
cc->nr_cpages = 0;
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;
cc->clen = LZ4_compressBound(PAGE_SIZE << cc->log_cluster_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) {
printk_ratelimited("%sF2FS-fs (%s): lz4 compress failed\n",
KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id);
return -EIO;
}
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;
}
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;
workspace_size = ZSTD_DStreamWorkspaceBound(MAX_COMPRESS_WINDOW_SIZE);
workspace = f2fs_kvmalloc(F2FS_I_SB(dic->inode),
workspace_size, GFP_NOFS);
if (!workspace)
return -ENOMEM;
stream = ZSTD_initDStream(MAX_COMPRESS_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
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
};
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 struct page *f2fs_grab_page(void)
{
struct page *page;
page = alloc_page(GFP_NOFS);
if (!page)
return NULL;
lock_page(page);
return page;
}
static int f2fs_compress_pages(struct compress_ctx *cc)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
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, nr_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 = f2fs_kzalloc(sbi, sizeof(struct page *) *
cc->nr_cpages, GFP_NOFS);
if (!cc->cpages) {
ret = -ENOMEM;
goto destroy_compress_ctx;
}
for (i = 0; i < cc->nr_cpages; i++) {
cc->cpages[i] = f2fs_grab_page();
if (!cc->cpages[i]) {
ret = -ENOMEM;
goto out_free_cpages;
}
}
cc->rbuf = vmap(cc->rpages, cc->cluster_size, VM_MAP, PAGE_KERNEL_RO);
if (!cc->rbuf) {
ret = -ENOMEM;
goto out_free_cpages;
}
cc->cbuf = vmap(cc->cpages, cc->nr_cpages, VM_MAP, PAGE_KERNEL);
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);
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,
(nr_cpages * PAGE_SIZE) - (cc->clen + COMPRESS_HEADER_SIZE));
vunmap(cc->cbuf);
vunmap(cc->rbuf);
for (i = nr_cpages; i < cc->nr_cpages; i++) {
f2fs_put_compressed_page(cc->cpages[i]);
cc->cpages[i] = NULL;
}
if (cops->destroy_compress_ctx)
cops->destroy_compress_ctx(cc);
cc->nr_cpages = nr_cpages;
trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
cc->clen, ret);
return 0;
out_vunmap_cbuf:
vunmap(cc->cbuf);
out_vunmap_rbuf:
vunmap(cc->rbuf);
out_free_cpages:
for (i = 0; i < cc->nr_cpages; i++) {
if (cc->cpages[i])
f2fs_put_compressed_page(cc->cpages[i]);
}
kfree(cc->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;
dec_page_count(sbi, F2FS_RD_DATA);
if (bio->bi_status || PageError(page))
dic->failed = true;
if (refcount_dec_not_one(&dic->ref))
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;
}
if (cops->init_decompress_ctx) {
ret = cops->init_decompress_ctx(dic);
if (ret)
goto out_free_dic;
}
dic->rbuf = vmap(dic->tpages, dic->cluster_size, VM_MAP, PAGE_KERNEL);
if (!dic->rbuf) {
ret = -ENOMEM;
goto destroy_decompress_ctx;
}
dic->cbuf = vmap(dic->cpages, dic->nr_cpages, VM_MAP, PAGE_KERNEL_RO);
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:
vunmap(dic->cbuf);
out_vunmap_rbuf:
vunmap(dic->rbuf);
destroy_decompress_ctx:
if (cops->destroy_decompress_ctx)
cops->destroy_decompress_ctx(dic);
out_free_dic:
if (verity)
refcount_set(&dic->ref, dic->nr_cpages);
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, bool compr)
{
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, false);
}
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;
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, false);
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))
unlock_page(page);
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_destroy_compress_ctx(cc);
if (ret)
goto release_pages;
if (bio)
f2fs_submit_bio(sbi, bio, DATA);
ret = f2fs_init_compress_ctx(cc);
if (ret)
goto release_pages;
}
for (i = 0; i < cc->cluster_size; i++) {
f2fs_bug_on(sbi, cc->rpages[i]);
page = find_lock_page(mapping, start_idx + i);
f2fs_bug_on(sbi, !page);
f2fs_wait_on_page_writeback(page, DATA, true, true);
f2fs_compress_ctx_add_page(cc, page);
f2fs_put_page(page, 0);
if (!PageUptodate(page)) {
f2fs_unlock_rpages(cc, i + 1);
f2fs_put_rpages_mapping(cc, mapping, start_idx,
cc->cluster_size);
f2fs_destroy_compress_ctx(cc);
goto retry;
}
}
if (prealloc) {
__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;
}
__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_unlock_rpages(cc, i);
release_pages:
f2fs_put_rpages_mapping(cc, mapping, start_idx, i);
f2fs_destroy_compress_ctx(cc);
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 = {
.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);
return first_index;
}
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 = f2fs_encrypted_file(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 (!f2fs_trylock_op(sbi))
return -EAGAIN;
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;