#include <linux/fs.h>
#include <linux/f2fs_fs.h>
#include <linux/moduleparam.h>
#include <linux/writeback.h>
#include <linux/backing-dev.h>
#include <linux/lzo.h>
#include <linux/lz4.h>
#include <linux/zstd.h>
#include <linux/pagevec.h>
#include "f2fs.h"
#include "node.h"
#include "segment.h"
#include <trace/events/f2fs.h>
static struct kmem_cache *cic_entry_slab;
static struct kmem_cache *dic_entry_slab;
static void *page_array_alloc(struct f2fs_sb_info *sbi, int nr)
{
unsigned int size = sizeof(struct page *) * nr;
if (likely(size <= sbi->page_array_slab_size))
return f2fs_kmem_cache_alloc(sbi->page_array_slab,
GFP_F2FS_ZERO, false, sbi);
return f2fs_kzalloc(sbi, size, GFP_NOFS);
}
static void page_array_free(struct f2fs_sb_info *sbi, void *pages, int nr)
{
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);
bool (*is_level_valid)(int level);
};
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 folio *folio)
{
if (!folio->private)
return false;
if (folio_test_f2fs_nonpointer(folio))
return false;
f2fs_bug_on(F2FS_F_SB(folio),
*((u32 *)folio->private) != F2FS_COMPRESSED_PAGE_MAGIC);
return true;
}
static void f2fs_set_compressed_page(struct page *page,
struct inode *inode, pgoff_t index, void *data)
{
struct folio *folio = page_folio(page);
folio_attach_private(folio, (void *)data);
folio->index = index;
folio->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, bool 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 folio *f2fs_compress_control_folio(struct folio *folio)
{
struct compress_io_ctx *ctx = folio->private;
return page_folio(ctx->rpages[0]);
}
int f2fs_init_compress_ctx(struct compress_ctx *cc)
{
if (cc->rpages)
return 0;
cc->rpages = page_array_alloc(F2FS_I_SB(cc->inode), cc->cluster_size);
return cc->rpages ? 0 : -ENOMEM;
}
void f2fs_destroy_compress_ctx(struct compress_ctx *cc, bool reuse)
{
page_array_free(F2FS_I_SB(cc->inode), cc->rpages, cc->cluster_size);
cc->rpages = NULL;
cc->nr_rpages = 0;
cc->nr_cpages = 0;
cc->valid_nr_cpages = 0;
if (!reuse)
cc->cluster_idx = NULL_CLUSTER;
}
void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct folio *folio)
{
unsigned int cluster_ofs;
if (!f2fs_cluster_can_merge_page(cc, folio->index))
f2fs_bug_on(F2FS_I_SB(cc->inode), 1);
cluster_ofs = offset_in_cluster(cc, folio->index);
cc->rpages[cluster_ofs] = folio_page(folio, 0);
cc->nr_rpages++;
cc->cluster_idx = cluster_idx(cc, folio->index);
}
#ifdef CONFIG_F2FS_FS_LZO
static int lzo_init_compress_ctx(struct compress_ctx *cc)
{
cc->private = f2fs_vmalloc(F2FS_I_SB(cc->inode),
LZO1X_MEM_COMPRESS);
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)
{
vfree(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) {
f2fs_err_ratelimited(F2FS_I_SB(cc->inode),
"lzo compress failed, ret:%d", 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) {
f2fs_err_ratelimited(dic->sbi,
"lzo decompress failed, ret:%d", ret);
return -EIO;
}
if (dic->rlen != PAGE_SIZE << dic->log_cluster_size) {
f2fs_err_ratelimited(dic->sbi,
"lzo invalid rlen:%zu, expected:%lu",
dic->rlen, PAGE_SIZE << dic->log_cluster_size);
return -EIO;
}
return 0;
}
static const struct f2fs_compress_ops f2fs_lzo_ops = {
.init_compress_ctx = lzo_init_compress_ctx,
.destroy_compress_ctx = lzo_destroy_compress_ctx,
.compress_pages = lzo_compress_pages,
.decompress_pages = lzo_decompress_pages,
};
#endif
#ifdef CONFIG_F2FS_FS_LZ4
static int lz4_init_compress_ctx(struct compress_ctx *cc)
{
unsigned int size = LZ4_MEM_COMPRESS;
#ifdef CONFIG_F2FS_FS_LZ4HC
if (F2FS_I(cc->inode)->i_compress_level)
size = LZ4HC_MEM_COMPRESS;
#endif
cc->private = f2fs_vmalloc(F2FS_I_SB(cc->inode), size);
if (!cc->private)
return -ENOMEM;
cc->clen = cc->rlen - PAGE_SIZE - COMPRESS_HEADER_SIZE;
return 0;
}
static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
{
vfree(cc->private);
cc->private = NULL;
}
static int lz4_compress_pages(struct compress_ctx *cc)
{
int len = -EINVAL;
unsigned char level = F2FS_I(cc->inode)->i_compress_level;
if (!level)
len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
cc->clen, cc->private);
#ifdef CONFIG_F2FS_FS_LZ4HC
else
len = LZ4_compress_HC(cc->rbuf, cc->cbuf->cdata, cc->rlen,
cc->clen, level, cc->private);
#endif
if (len < 0)
return len;
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) {
f2fs_err_ratelimited(dic->sbi,
"lz4 decompress failed, ret:%d", ret);
return -EIO;
}
if (ret != PAGE_SIZE << dic->log_cluster_size) {
f2fs_err_ratelimited(dic->sbi,
"lz4 invalid ret:%d, expected:%lu",
ret, PAGE_SIZE << dic->log_cluster_size);
return -EIO;
}
return 0;
}
static bool lz4_is_level_valid(int lvl)
{
#ifdef CONFIG_F2FS_FS_LZ4HC
return !lvl || (lvl >= LZ4HC_MIN_CLEVEL && lvl <= LZ4HC_MAX_CLEVEL);
#else
return lvl == 0;
#endif
}
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,
.is_level_valid = lz4_is_level_valid,
};
#endif
#ifdef CONFIG_F2FS_FS_ZSTD
static int zstd_init_compress_ctx(struct compress_ctx *cc)
{
zstd_parameters params;
zstd_cstream *stream;
void *workspace;
unsigned int workspace_size;
unsigned char level = F2FS_I(cc->inode)->i_compress_level;
if (!level)
level = F2FS_ZSTD_DEFAULT_CLEVEL;
params = zstd_get_params(level, cc->rlen);
workspace_size = zstd_cstream_workspace_bound(¶ms.cParams);
workspace = f2fs_vmalloc(F2FS_I_SB(cc->inode), workspace_size);
if (!workspace)
return -ENOMEM;
stream = zstd_init_cstream(¶ms, 0, workspace, workspace_size);
if (!stream) {
f2fs_err_ratelimited(F2FS_I_SB(cc->inode),
"%s zstd_init_cstream failed", __func__);
vfree(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)
{
vfree(cc->private);
cc->private = NULL;
cc->private2 = NULL;
}
static int zstd_compress_pages(struct compress_ctx *cc)
{
zstd_cstream *stream = cc->private2;
zstd_in_buffer inbuf;
zstd_out_buffer outbuf;
int src_size = cc->rlen;
int dst_size = src_size - PAGE_SIZE - COMPRESS_HEADER_SIZE;
int ret;
inbuf.pos = 0;
inbuf.src = cc->rbuf;
inbuf.size = src_size;
outbuf.pos = 0;
outbuf.dst = cc->cbuf->cdata;
outbuf.size = dst_size;
ret = zstd_compress_stream(stream, &outbuf, &inbuf);
if (zstd_is_error(ret)) {
f2fs_err_ratelimited(F2FS_I_SB(cc->inode),
"%s zstd_compress_stream failed, ret: %d",
__func__, zstd_get_error_code(ret));
return -EIO;
}
ret = zstd_end_stream(stream, &outbuf);
if (zstd_is_error(ret)) {
f2fs_err_ratelimited(F2FS_I_SB(cc->inode),
"%s zstd_end_stream returned %d",
__func__, zstd_get_error_code(ret));
return -EIO;
}
if (ret)
return -EAGAIN;
cc->clen = outbuf.pos;
return 0;
}
static int zstd_init_decompress_ctx(struct decompress_io_ctx *dic)
{
zstd_dstream *stream;
void *workspace;
unsigned int workspace_size;
unsigned int max_window_size =
MAX_COMPRESS_WINDOW_SIZE(dic->log_cluster_size);
workspace_size = zstd_dstream_workspace_bound(max_window_size);
workspace = f2fs_vmalloc(dic->sbi, workspace_size);
if (!workspace)
return -ENOMEM;
stream = zstd_init_dstream(max_window_size, workspace, workspace_size);
if (!stream) {
f2fs_err_ratelimited(dic->sbi,
"%s zstd_init_dstream failed", __func__);
vfree(workspace);
return -EIO;
}
dic->private = workspace;
dic->private2 = stream;
return 0;
}
static void zstd_destroy_decompress_ctx(struct decompress_io_ctx *dic)
{
vfree(dic->private);
dic->private = NULL;
dic->private2 = NULL;
}
static int zstd_decompress_pages(struct decompress_io_ctx *dic)
{
zstd_dstream *stream = dic->private2;
zstd_in_buffer inbuf;
zstd_out_buffer outbuf;
int ret;
inbuf.pos = 0;
inbuf.src = dic->cbuf->cdata;
inbuf.size = dic->clen;
outbuf.pos = 0;
outbuf.dst = dic->rbuf;
outbuf.size = dic->rlen;
ret = zstd_decompress_stream(stream, &outbuf, &inbuf);
if (zstd_is_error(ret)) {
f2fs_err_ratelimited(dic->sbi,
"%s zstd_decompress_stream failed, ret: %d",
__func__, zstd_get_error_code(ret));
return -EIO;
}
if (dic->rlen != outbuf.pos) {
f2fs_err_ratelimited(dic->sbi,
"%s ZSTD invalid rlen:%zu, expected:%lu",
__func__, dic->rlen,
PAGE_SIZE << dic->log_cluster_size);
return -EIO;
}
return 0;
}
static bool zstd_is_level_valid(int lvl)
{
return lvl >= zstd_min_clevel() && lvl <= zstd_max_clevel();
}
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,
.is_level_valid = zstd_is_level_valid,
};
#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) {
f2fs_err_ratelimited(F2FS_I_SB(cc->inode),
"lzo-rle compress failed, ret:%d", 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];
}
bool f2fs_is_compress_level_valid(int alg, int lvl)
{
const struct f2fs_compress_ops *cops = f2fs_cops[alg];
if (cops->is_level_valid)
return cops->is_level_valid(lvl);
return lvl == 0;
}
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 __init f2fs_init_compress_mempool(void)
{
compress_page_pool = mempool_create_page_pool(num_compress_pages, 0);
return compress_page_pool ? 0 : -ENOMEM;
}
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)
{
struct folio *folio;
if (!page)
return;
folio = page_folio(page);
folio_detach_private(folio);
folio->mapping = NULL;
folio_unlock(folio);
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_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, new_nr_cpages;
u32 chksum = 0;
int i, ret;
trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
cc->cluster_size, fi->i_compress_algorithm);
if (cops->init_compress_ctx) {
ret = cops->init_compress_ctx(cc);
if (ret)
goto out;
}
max_len = COMPRESS_HEADER_SIZE + cc->clen;
cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
cc->valid_nr_cpages = cc->nr_cpages;
cc->cpages = page_array_alloc(sbi, 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();
cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
if (!cc->rbuf) {
ret = -ENOMEM;
goto out_free_cpages;
}
cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
if (!cc->cbuf) {
ret = -ENOMEM;
goto out_vunmap_rbuf;
}
ret = cops->compress_pages(cc);
if (ret)
goto out_vunmap_cbuf;
max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
if (cc->clen > max_len) {
ret = -EAGAIN;
goto out_vunmap_cbuf;
}
cc->cbuf->clen = cpu_to_le32(cc->clen);
if (fi->i_compress_flag & BIT(COMPRESS_CHKSUM))
chksum = f2fs_crc32(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);
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 = new_nr_cpages; i < cc->nr_cpages; i++) {
f2fs_compress_free_page(cc->cpages[i]);
cc->cpages[i] = NULL;
}
if (cops->destroy_compress_ctx)
cops->destroy_compress_ctx(cc);
cc->valid_nr_cpages = new_nr_cpages;
trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
cc->clen, ret);
return 0;
out_vunmap_cbuf:
vm_unmap_ram(cc->cbuf, cc->nr_cpages);
out_vunmap_rbuf:
vm_unmap_ram(cc->rbuf, cc->cluster_size);
out_free_cpages:
for (i = 0; i < cc->nr_cpages; i++) {
if (cc->cpages[i])
f2fs_compress_free_page(cc->cpages[i]);
}
page_array_free(sbi, cc->cpages, cc->nr_cpages);
cc->cpages = NULL;
destroy_compress_ctx:
if (cops->destroy_compress_ctx)
cops->destroy_compress_ctx(cc);
out:
trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
cc->clen, ret);
return ret;
}
static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic,
bool pre_alloc);
static void f2fs_release_decomp_mem(struct decompress_io_ctx *dic,
bool bypass_destroy_callback, bool pre_alloc);
void f2fs_decompress_cluster(struct decompress_io_ctx *dic, bool in_task)
{
struct f2fs_sb_info *sbi = dic->sbi;
struct f2fs_inode_info *fi = F2FS_I(dic->inode);
const struct f2fs_compress_ops *cops =
f2fs_cops[fi->i_compress_algorithm];
bool bypass_callback = false;
int ret;
trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
dic->cluster_size, fi->i_compress_algorithm);
if (dic->failed) {
ret = -EIO;
goto out_end_io;
}
ret = f2fs_prepare_decomp_mem(dic, false);
if (ret) {
bypass_callback = true;
goto out_release;
}
dic->clen = le32_to_cpu(dic->cbuf->clen);
dic->rlen = PAGE_SIZE << dic->log_cluster_size;
if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
ret = -EFSCORRUPTED;
f2fs_handle_error(sbi, ERROR_FAIL_DECOMPRESSION);
goto out_release;
}
ret = cops->decompress_pages(dic);
if (!ret && (fi->i_compress_flag & BIT(COMPRESS_CHKSUM))) {
u32 provided = le32_to_cpu(dic->cbuf->chksum);
u32 calculated = f2fs_crc32(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);
f2fs_info_ratelimited(sbi,
"checksum invalid, nid = %lu, %x vs %x",
dic->inode->i_ino,
provided, calculated);
}
set_sbi_flag(sbi, SBI_NEED_FSCK);
}
}
out_release:
f2fs_release_decomp_mem(dic, bypass_callback, false);
out_end_io:
trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
dic->clen, ret);
f2fs_decompress_end_io(dic, ret, in_task);
}
static void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi,
struct folio *folio, nid_t ino, block_t blkaddr);
void f2fs_end_read_compressed_page(struct folio *folio, bool failed,
block_t blkaddr, bool in_task)
{
struct decompress_io_ctx *dic = folio->private;
struct f2fs_sb_info *sbi = dic->sbi;
dec_page_count(sbi, F2FS_RD_DATA);
if (failed)
WRITE_ONCE(dic->failed, true);
else if (blkaddr && in_task)
f2fs_cache_compressed_page(sbi, folio,
dic->inode->i_ino, blkaddr);
if (atomic_dec_and_test(&dic->remaining_pages))
f2fs_decompress_cluster(dic, in_task);
}
static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
{
if (cc->cluster_idx == NULL_CLUSTER)
return true;
return cc->cluster_idx == cluster_idx(cc, index);
}
bool f2fs_cluster_is_empty(struct compress_ctx *cc)
{
return cc->nr_rpages == 0;
}
static bool f2fs_cluster_is_full(struct compress_ctx *cc)
{
return cc->cluster_size == cc->nr_rpages;
}
bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
{
if (f2fs_cluster_is_empty(cc))
return true;
return is_page_in_cluster(cc, index);
}
bool f2fs_all_cluster_page_ready(struct compress_ctx *cc, struct page **pages,
int index, int nr_pages, bool uptodate)
{
unsigned long pgidx = page_folio(pages[index])->index;
int i = uptodate ? 0 : 1;
if (uptodate && (pgidx % cc->cluster_size))
return false;
if (nr_pages - index < cc->cluster_size)
return false;
for (; i < cc->cluster_size; i++) {
struct folio *folio = page_folio(pages[index + i]);
if (folio->index != pgidx + i)
return false;
if (uptodate && !folio_test_uptodate(folio))
return false;
}
return true;
}
static bool cluster_has_invalid_data(struct compress_ctx *cc)
{
loff_t i_size = i_size_read(cc->inode);
unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
int i;
for (i = 0; i < cc->cluster_size; i++) {
struct page *page = cc->rpages[i];
f2fs_bug_on(F2FS_I_SB(cc->inode), !page);
if (page_folio(page)->index >= nr_pages)
return true;
}
return false;
}
bool f2fs_sanity_check_cluster(struct dnode_of_data *dn)
{
#ifdef CONFIG_F2FS_CHECK_FS
struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
unsigned int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
int cluster_end = 0;
unsigned int count;
int i;
char *reason = "";
if (dn->data_blkaddr != COMPRESS_ADDR)
return false;
if (dn->ofs_in_node % cluster_size) {
reason = "[*|C|*|*]";
goto out;
}
for (i = 1, count = 1; i < cluster_size; i++, count++) {
block_t blkaddr = data_blkaddr(dn->inode, dn->node_folio,
dn->ofs_in_node + i);
if (blkaddr == COMPRESS_ADDR) {
reason = "[C|*|C|*]";
goto out;
}
if (!__is_valid_data_blkaddr(blkaddr)) {
if (!cluster_end)
cluster_end = i;
continue;
}
if (cluster_end) {
reason = "[C|N|N|V]";
goto out;
}
}
f2fs_bug_on(F2FS_I_SB(dn->inode), count != cluster_size &&
!is_inode_flag_set(dn->inode, FI_COMPRESS_RELEASED));
return false;
out:
f2fs_warn(sbi, "access invalid cluster, ino:%lu, nid:%u, ofs_in_node:%u, reason:%s",
dn->inode->i_ino, dn->nid, dn->ofs_in_node, reason);
set_sbi_flag(sbi, SBI_NEED_FSCK);
return true;
#else
return false;
#endif
}
static int __f2fs_get_cluster_blocks(struct inode *inode,
struct dnode_of_data *dn)
{
unsigned int cluster_size = F2FS_I(inode)->i_cluster_size;
int count, i;
for (i = 0, count = 0; i < cluster_size; i++) {
block_t blkaddr = data_blkaddr(dn->inode, dn->node_folio,
dn->ofs_in_node + i);
if (__is_valid_data_blkaddr(blkaddr))
count++;
}
return count;
}
static int __f2fs_cluster_blocks(struct inode *inode, unsigned int cluster_idx,
enum cluster_check_type type)
{
struct dnode_of_data dn;
unsigned int start_idx = cluster_idx <<
F2FS_I(inode)->i_log_cluster_size;
int ret;
set_new_dnode(&dn, inode, NULL, NULL, 0);
ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
if (ret) {
if (ret == -ENOENT)
ret = 0;
goto fail;
}
if (f2fs_sanity_check_cluster(&dn)) {
ret = -EFSCORRUPTED;
goto fail;
}
if (dn.data_blkaddr == COMPRESS_ADDR) {
if (type == CLUSTER_COMPR_BLKS)
ret = 1 + __f2fs_get_cluster_blocks(inode, &dn);
else if (type == CLUSTER_IS_COMPR)
ret = 1;
} else if (type == CLUSTER_RAW_BLKS) {
ret = __f2fs_get_cluster_blocks(inode, &dn);
}
fail:
f2fs_put_dnode(&dn);
return ret;
}
static int f2fs_compressed_blocks(struct compress_ctx *cc)
{
return __f2fs_cluster_blocks(cc->inode, cc->cluster_idx,
CLUSTER_COMPR_BLKS);
}
static int f2fs_decompressed_blocks(struct inode *inode,
unsigned int cluster_idx)
{
return __f2fs_cluster_blocks(inode, cluster_idx,
CLUSTER_RAW_BLKS);
}
int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
{
return __f2fs_cluster_blocks(inode,
index >> F2FS_I(inode)->i_log_cluster_size,
CLUSTER_IS_COMPR);
}
bool f2fs_is_sparse_cluster(struct inode *inode, pgoff_t index)
{
unsigned int cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size;
return f2fs_decompressed_blocks(inode, cluster_idx) !=
F2FS_I(inode)->i_cluster_size;
}
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 cancel_cluster_writeback(struct compress_ctx *cc,
struct compress_io_ctx *cic, int submitted)
{
int i;
if (submitted > 1) {
f2fs_submit_merged_write(F2FS_I_SB(cc->inode), DATA);
while (atomic_read(&cic->pending_pages) !=
(cc->valid_nr_cpages - submitted + 1))
f2fs_io_schedule_timeout(DEFAULT_SCHEDULE_TIMEOUT);
}
for (i = 0; i < cc->cluster_size; i++) {
if (i < submitted) {
inode_inc_dirty_pages(cc->inode);
lock_page(cc->rpages[i]);
}
clear_page_private_gcing(cc->rpages[i]);
if (folio_test_writeback(page_folio(cc->rpages[i])))
end_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]);
set_page_private_gcing(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 folio *folio;
sector_t last_block_in_bio;
fgf_t 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;
for (i = 0; i < cc->cluster_size; i++) {
folio = f2fs_filemap_get_folio(mapping, start_idx + i,
fgp_flag, GFP_NOFS);
if (IS_ERR(folio)) {
ret = PTR_ERR(folio);
goto unlock_pages;
}
if (folio_test_uptodate(folio))
f2fs_folio_put(folio, true);
else
f2fs_compress_ctx_add_page(cc, folio);
}
if (!f2fs_cluster_is_empty(cc)) {
struct bio *bio = NULL;
ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
&last_block_in_bio, NULL, true);
f2fs_put_rpages(cc);
f2fs_destroy_compress_ctx(cc, true);
if (ret)
goto out;
if (bio)
f2fs_submit_read_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]);
folio = filemap_lock_folio(mapping, start_idx + i);
if (IS_ERR(folio)) {
goto release_and_retry;
}
f2fs_folio_wait_writeback(folio, DATA, true, true);
f2fs_compress_ctx_add_page(cc, folio);
if (!folio_test_uptodate(folio)) {
f2fs_handle_page_eio(sbi, folio, DATA);
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,
.vi = NULL,
};
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,
};
struct folio *folio = page_folio(cc.rpages[0]);
bool first_index = (index == folio->index);
if (copied)
set_cluster_dirty(&cc);
f2fs_put_rpages_wbc(&cc, NULL, false, true);
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;
struct page **rpages;
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 i;
int err;
err = f2fs_is_compressed_cluster(inode, start_idx);
if (err < 0)
return err;
if (!err)
return f2fs_do_truncate_blocks(inode, from, lock);
err = f2fs_prepare_compress_overwrite(inode, &pagep,
start_idx, &fsdata);
f2fs_bug_on(F2FS_I_SB(inode), err == 0);
if (err <= 0)
return err;
rpages = fsdata;
for (i = (1 << log_cluster_size) - 1; i >= 0; i--) {
struct folio *folio = page_folio(rpages[i]);
loff_t start = (loff_t)folio->index << PAGE_SHIFT;
loff_t offset = from > start ? from - start : 0;
folio_zero_segment(folio, offset, folio_size(folio));
if (from >= start)
break;
}
f2fs_compress_write_end(inode, fsdata, start_idx, true);
err = filemap_write_and_wait_range(inode->i_mapping,
round_down(from, 1 << log_cluster_size << PAGE_SHIFT),
LLONG_MAX);
if (err)
return err;
truncate_pagecache(inode, from);
return f2fs_do_truncate_blocks(inode, round_up(from, PAGE_SIZE), lock);
}
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,
.io_type = io_type,
.io_wbc = wbc,
.encrypted = fscrypt_inode_uses_fs_layer_crypto(cc->inode) ?
1 : 0,
};
struct folio *folio;
struct dnode_of_data dn;
struct node_info ni;
struct compress_io_ctx *cic;
struct f2fs_lock_context lc;
pgoff_t start_idx = start_idx_of_cluster(cc);
unsigned int last_index = cc->cluster_size - 1;
loff_t psize;
int i, err;
bool quota_inode = IS_NOQUOTA(inode);
if (unlikely(f2fs_cp_error(sbi))) {
mapping_set_error(inode->i_mapping, -EIO);
goto out_free;
}
if (quota_inode) {
f2fs_down_read_trace(&sbi->node_write, &lc);
} else if (!f2fs_trylock_op(sbi, &lc)) {
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_folio,
dn.ofs_in_node + i) == NULL_ADDR)
goto out_put_dnode;
}
folio = page_folio(cc->rpages[last_index]);
psize = folio_next_pos(folio);
err = f2fs_get_node_info(fio.sbi, dn.nid, &ni, false);
if (err)
goto out_put_dnode;
fio.version = ni.version;
cic = f2fs_kmem_cache_alloc(cic_entry_slab, GFP_F2FS_ZERO, false, sbi);
if (!cic)
goto out_put_dnode;
cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
cic->inode = inode;
atomic_set(&cic->pending_pages, cc->valid_nr_cpages);
cic->rpages = page_array_alloc(sbi, cc->cluster_size);
if (!cic->rpages)
goto out_put_cic;
cic->nr_rpages = cc->cluster_size;
for (i = 0; i < cc->valid_nr_cpages; i++) {
f2fs_set_compressed_page(cc->cpages[i], inode,
page_folio(cc->rpages[i + 1])->index, cic);
fio.compressed_page = cc->cpages[i];
fio.old_blkaddr = data_blkaddr(dn.inode, dn.node_folio,
dn.ofs_in_node + i + 1);
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;
if (i == 0) {
if (blkaddr == COMPRESS_ADDR)
fio.compr_blocks++;
if (__is_valid_data_blkaddr(blkaddr))
f2fs_invalidate_blocks(sbi, blkaddr, 1);
f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
goto unlock_continue;
}
if (fio.compr_blocks && __is_valid_data_blkaddr(blkaddr))
fio.compr_blocks++;
if (i > cc->valid_nr_cpages) {
if (__is_valid_data_blkaddr(blkaddr)) {
f2fs_invalidate_blocks(sbi, blkaddr, 1);
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;
fio.submitted = 0;
f2fs_outplace_write_data(&dn, &fio);
if (unlikely(!fio.submitted)) {
cancel_cluster_writeback(cc, cic, i);
i = cc->valid_nr_cpages;
*submitted = 0;
goto out_destroy_crypt;
}
(*submitted)++;
unlock_continue:
inode_dec_dirty_pages(cc->inode);
folio_unlock(fio.folio);
}
if (fio.compr_blocks)
f2fs_i_compr_blocks_update(inode, fio.compr_blocks - 1, false);
f2fs_i_compr_blocks_update(inode, cc->valid_nr_cpages, true);
add_compr_block_stat(inode, cc->valid_nr_cpages);
set_inode_flag(cc->inode, FI_APPEND_WRITE);
f2fs_put_dnode(&dn);
if (quota_inode)
f2fs_up_read_trace(&sbi->node_write, &lc);
else
f2fs_unlock_op(sbi, &lc);
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(sbi, cc->cpages, cc->nr_cpages);
cc->cpages = NULL;
f2fs_destroy_compress_ctx(cc, false);
return 0;
out_destroy_crypt:
page_array_free(sbi, cic->rpages, cc->cluster_size);
for (--i; i >= 0; i--) {
if (!cc->cpages[i])
continue;
fscrypt_finalize_bounce_page(&cc->cpages[i]);
}
out_put_cic:
kmem_cache_free(cic_entry_slab, cic);
out_put_dnode:
f2fs_put_dnode(&dn);
out_unlock_op:
if (quota_inode)
f2fs_up_read_trace(&sbi->node_write, &lc);
else
f2fs_unlock_op(sbi, &lc);
out_free:
for (i = 0; i < cc->valid_nr_cpages; i++) {
f2fs_compress_free_page(cc->cpages[i]);
cc->cpages[i] = NULL;
}
page_array_free(sbi, cc->cpages, cc->nr_cpages);
cc->cpages = NULL;
return -EAGAIN;
}
void f2fs_compress_write_end_io(struct bio *bio, struct folio *folio)
{
struct page *page = &folio->page;
struct f2fs_sb_info *sbi = bio->bi_private;
struct compress_io_ctx *cic = folio->private;
enum count_type type = WB_DATA_TYPE(folio,
f2fs_is_compressed_page(folio));
int i;
if (unlikely(bio->bi_status != BLK_STS_OK))
mapping_set_error(cic->inode->i_mapping, -EIO);
f2fs_compress_free_page(page);
dec_page_count(sbi, type);
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(sbi, cic->rpages, cic->nr_rpages);
kmem_cache_free(cic_entry_slab, cic);
}
static int f2fs_write_raw_pages(struct compress_ctx *cc,
int *submitted_p,
struct writeback_control *wbc,
enum iostat_type io_type)
{
struct address_space *mapping = cc->inode->i_mapping;
struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
struct f2fs_lock_context lc;
int submitted, compr_blocks, i;
int ret = 0;
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;
if (compr_blocks > 0)
f2fs_lock_op(sbi, &lc);
for (i = 0; i < cc->cluster_size; i++) {
struct folio *folio;
if (!cc->rpages[i])
continue;
folio = page_folio(cc->rpages[i]);
retry_write:
folio_lock(folio);
if (folio->mapping != mapping) {
continue_unlock:
folio_unlock(folio);
continue;
}
if (!folio_test_dirty(folio))
goto continue_unlock;
if (folio_test_writeback(folio)) {
if (wbc->sync_mode == WB_SYNC_NONE)
goto continue_unlock;
f2fs_folio_wait_writeback(folio, DATA, true, true);
}
if (!folio_clear_dirty_for_io(folio))
goto continue_unlock;
submitted = 0;
ret = f2fs_write_single_data_page(folio, &submitted,
NULL, NULL, wbc, io_type,
compr_blocks, false);
if (ret) {
if (ret == 1) {
ret = 0;
} else if (ret == -EAGAIN) {
ret = 0;
if (IS_NOQUOTA(cc->inode))
goto out;
f2fs_schedule_timeout(DEFAULT_SCHEDULE_TIMEOUT);
goto retry_write;
}
goto out;
}
*submitted_p += submitted;
}
out:
if (compr_blocks > 0)
f2fs_unlock_op(sbi, &lc);
f2fs_balance_fs(sbi, true);
return ret;
}
int f2fs_write_multi_pages(struct compress_ctx *cc,
int *submitted,
struct writeback_control *wbc,
enum iostat_type io_type)
{
int err;
*submitted = 0;
if (cluster_may_compress(cc)) {
err = f2fs_compress_pages(cc);
if (err == -EAGAIN) {
add_compr_block_stat(cc->inode, cc->cluster_size);
goto write;
} else if (err) {
f2fs_put_rpages_wbc(cc, wbc, true, true);
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, false);
destroy_out:
f2fs_destroy_compress_ctx(cc, false);
return err;
}
static inline bool allow_memalloc_for_decomp(struct f2fs_sb_info *sbi,
bool pre_alloc)
{
return pre_alloc ^ f2fs_low_mem_mode(sbi);
}
static int f2fs_prepare_decomp_mem(struct decompress_io_ctx *dic,
bool pre_alloc)
{
const struct f2fs_compress_ops *cops = f2fs_cops[dic->compress_algorithm];
int i;
if (!allow_memalloc_for_decomp(dic->sbi, pre_alloc))
return 0;
dic->tpages = page_array_alloc(dic->sbi, dic->cluster_size);
if (!dic->tpages)
return -ENOMEM;
for (i = 0; i < dic->cluster_size; i++) {
if (dic->rpages[i]) {
dic->tpages[i] = dic->rpages[i];
continue;
}
dic->tpages[i] = f2fs_compress_alloc_page();
}
dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
if (!dic->rbuf)
return -ENOMEM;
dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
if (!dic->cbuf)
return -ENOMEM;
if (cops->init_decompress_ctx)
return cops->init_decompress_ctx(dic);
return 0;
}
static void f2fs_release_decomp_mem(struct decompress_io_ctx *dic,
bool bypass_destroy_callback, bool pre_alloc)
{
const struct f2fs_compress_ops *cops = f2fs_cops[dic->compress_algorithm];
if (!allow_memalloc_for_decomp(dic->sbi, pre_alloc))
return;
if (!bypass_destroy_callback && cops->destroy_decompress_ctx)
cops->destroy_decompress_ctx(dic);
if (dic->cbuf)
vm_unmap_ram(dic->cbuf, dic->nr_cpages);
if (dic->rbuf)
vm_unmap_ram(dic->rbuf, dic->cluster_size);
}
static void f2fs_free_dic(struct decompress_io_ctx *dic,
bool bypass_destroy_callback);
struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
{
struct decompress_io_ctx *dic;
pgoff_t start_idx = start_idx_of_cluster(cc);
struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
int i, ret;
dic = f2fs_kmem_cache_alloc(dic_entry_slab, GFP_F2FS_ZERO, false, sbi);
if (!dic)
return ERR_PTR(-ENOMEM);
dic->rpages = page_array_alloc(sbi, 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;
dic->sbi = sbi;
dic->compress_algorithm = F2FS_I(cc->inode)->i_compress_algorithm;
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->vi = cc->vi;
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(sbi, dic->nr_cpages);
if (!dic->cpages) {
ret = -ENOMEM;
goto out_free;
}
for (i = 0; i < dic->nr_cpages; i++) {
struct page *page;
page = f2fs_compress_alloc_page();
f2fs_set_compressed_page(page, cc->inode,
start_idx + i + 1, dic);
dic->cpages[i] = page;
}
ret = f2fs_prepare_decomp_mem(dic, true);
if (ret)
goto out_free;
return dic;
out_free:
f2fs_free_dic(dic, true);
return ERR_PTR(ret);
}
static void f2fs_free_dic(struct decompress_io_ctx *dic,
bool bypass_destroy_callback)
{
int i;
struct f2fs_sb_info *sbi = dic->sbi;
f2fs_release_decomp_mem(dic, bypass_destroy_callback, true);
if (dic->tpages) {
for (i = 0; i < dic->cluster_size; i++) {
if (dic->rpages[i])
continue;
if (!dic->tpages[i])
continue;
f2fs_compress_free_page(dic->tpages[i]);
}
page_array_free(sbi, 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(sbi, dic->cpages, dic->nr_cpages);
}
page_array_free(sbi, dic->rpages, dic->nr_rpages);
kmem_cache_free(dic_entry_slab, dic);
}
static void f2fs_late_free_dic(struct work_struct *work)
{
struct decompress_io_ctx *dic =
container_of(work, struct decompress_io_ctx, free_work);
f2fs_free_dic(dic, false);
}
static void f2fs_put_dic(struct decompress_io_ctx *dic, bool in_task)
{
if (refcount_dec_and_test(&dic->refcnt)) {
if (in_task) {
f2fs_free_dic(dic, false);
} else {
INIT_WORK(&dic->free_work, f2fs_late_free_dic);
queue_work(dic->sbi->post_read_wq, &dic->free_work);
}
}
}
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;
for (i = 0; i < dic->cluster_size; i++) {
struct page *rpage = dic->rpages[i];
struct folio *rfolio;
if (!rpage)
continue;
rfolio = page_folio(rpage);
if (fsverity_verify_folio(dic->vi, rfolio))
folio_mark_uptodate(rfolio);
folio_unlock(rfolio);
}
f2fs_put_dic(dic, true);
}
void f2fs_decompress_end_io(struct decompress_io_ctx *dic, bool failed,
bool in_task)
{
int i;
if (IS_ENABLED(CONFIG_FS_VERITY) && !failed && dic->vi) {
INIT_WORK(&dic->verity_work, f2fs_verify_cluster);
fsverity_enqueue_verify_work(&dic->verity_work);
return;
}
for (i = 0; i < dic->cluster_size; i++) {
struct page *rpage = dic->rpages[i];
if (!rpage)
continue;
if (failed)
ClearPageUptodate(rpage);
else
SetPageUptodate(rpage);
unlock_page(rpage);
}
f2fs_put_dic(dic, in_task);
}
void f2fs_put_folio_dic(struct folio *folio, bool in_task)
{
struct decompress_io_ctx *dic = folio->private;
f2fs_put_dic(dic, in_task);
}
unsigned int f2fs_cluster_blocks_are_contiguous(struct dnode_of_data *dn,
unsigned int ofs_in_node)
{
bool compressed = data_blkaddr(dn->inode, dn->node_folio,
ofs_in_node) == COMPRESS_ADDR;
int i = compressed ? 1 : 0;
block_t first_blkaddr = data_blkaddr(dn->inode, dn->node_folio,
ofs_in_node + i);
for (i += 1; i < F2FS_I(dn->inode)->i_cluster_size; i++) {
block_t blkaddr = data_blkaddr(dn->inode, dn->node_folio,
ofs_in_node + i);
if (!__is_valid_data_blkaddr(blkaddr))
break;
if (first_blkaddr + i - (compressed ? 1 : 0) != blkaddr)
return 0;
}
return compressed ? i - 1 : i;
}
const struct address_space_operations f2fs_compress_aops = {
.release_folio = f2fs_release_folio,
.invalidate_folio = f2fs_invalidate_folio,
.migrate_folio = filemap_migrate_folio,
};
struct address_space *COMPRESS_MAPPING(struct f2fs_sb_info *sbi)
{
return sbi->compress_inode->i_mapping;
}
void f2fs_invalidate_compress_pages_range(struct f2fs_sb_info *sbi,
block_t blkaddr, unsigned int len)
{
if (!sbi->compress_inode)
return;
invalidate_mapping_pages(COMPRESS_MAPPING(sbi), blkaddr, blkaddr + len - 1);
}
static void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi,
struct folio *folio, nid_t ino, block_t blkaddr)
{
struct folio *cfolio;
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;
cfolio = filemap_get_folio(COMPRESS_MAPPING(sbi), blkaddr);
if (!IS_ERR(cfolio)) {
f2fs_folio_put(cfolio, false);
return;
}
cfolio = filemap_alloc_folio(__GFP_NOWARN | __GFP_IO, 0, NULL);
if (!cfolio)
return;
ret = filemap_add_folio(COMPRESS_MAPPING(sbi), cfolio,
blkaddr, GFP_NOFS);
if (ret) {
f2fs_folio_put(cfolio, false);
return;
}
folio_set_f2fs_data(cfolio, ino);
memcpy(folio_address(cfolio), folio_address(folio), PAGE_SIZE);
folio_mark_uptodate(cfolio);
f2fs_folio_put(cfolio, true);
}
bool f2fs_load_compressed_folio(struct f2fs_sb_info *sbi, struct folio *folio,
block_t blkaddr)
{
struct folio *cfolio;
bool hitted = false;
if (!test_opt(sbi, COMPRESS_CACHE))
return false;
cfolio = f2fs_filemap_get_folio(COMPRESS_MAPPING(sbi),
blkaddr, FGP_LOCK | FGP_NOWAIT, GFP_NOFS);
if (!IS_ERR(cfolio)) {
if (folio_test_uptodate(cfolio)) {
atomic_inc(&sbi->compress_page_hit);
memcpy(folio_address(folio),
folio_address(cfolio), folio_size(folio));
hitted = true;
}
f2fs_folio_put(cfolio, true);
}
return hitted;
}
void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi, nid_t ino)
{
struct address_space *mapping = COMPRESS_MAPPING(sbi);
struct folio_batch fbatch;
pgoff_t index = 0;
pgoff_t end = MAX_BLKADDR(sbi);
if (!mapping->nrpages)
return;
folio_batch_init(&fbatch);
do {
unsigned int nr, i;
nr = filemap_get_folios(mapping, &index, end - 1, &fbatch);
if (!nr)
break;
for (i = 0; i < nr; i++) {
struct folio *folio = fbatch.folios[i];
folio_lock(folio);
if (folio->mapping != mapping) {
folio_unlock(folio);
continue;
}
if (ino != folio_get_f2fs_data(folio)) {
folio_unlock(folio);
continue;
}
generic_error_remove_folio(mapping, folio);
folio_unlock(folio);
}
folio_batch_release(&fbatch);
cond_resched();
} while (index < end);
}
int f2fs_init_compress_inode(struct f2fs_sb_info *sbi)
{
struct inode *inode;
if (!test_opt(sbi, COMPRESS_CACHE))
return 0;
inode = f2fs_iget(sbi->sb, F2FS_COMPRESS_INO(sbi));
if (IS_ERR(inode))
return PTR_ERR(inode);
sbi->compress_inode = inode;
sbi->compress_percent = COMPRESS_PERCENT;
sbi->compress_watermark = COMPRESS_WATERMARK;
atomic_set(&sbi->compress_page_hit, 0);
return 0;
}
void f2fs_destroy_compress_inode(struct f2fs_sb_info *sbi)
{
if (!sbi->compress_inode)
return;
iput(sbi->compress_inode);
sbi->compress_inode = NULL;
}
int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi)
{
dev_t dev = sbi->sb->s_bdev->bd_dev;
char slab_name[35];
if (!f2fs_sb_has_compression(sbi))
return 0;
sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev), MINOR(dev));
sbi->page_array_slab_size = sizeof(struct page *) <<
F2FS_OPTION(sbi).compress_log_size;
sbi->page_array_slab = f2fs_kmem_cache_create(slab_name,
sbi->page_array_slab_size);
return sbi->page_array_slab ? 0 : -ENOMEM;
}
void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi)
{
kmem_cache_destroy(sbi->page_array_slab);
}
int __init f2fs_init_compress_cache(void)
{
cic_entry_slab = f2fs_kmem_cache_create("f2fs_cic_entry",
sizeof(struct compress_io_ctx));
if (!cic_entry_slab)
return -ENOMEM;
dic_entry_slab = f2fs_kmem_cache_create("f2fs_dic_entry",
sizeof(struct decompress_io_ctx));
if (!dic_entry_slab)
goto free_cic;
return 0;
free_cic:
kmem_cache_destroy(cic_entry_slab);
return -ENOMEM;
}
void f2fs_destroy_compress_cache(void)
{
kmem_cache_destroy(dic_entry_slab);
kmem_cache_destroy(cic_entry_slab);
}
