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Date: Sat, 29 May 2021 15:24:45 +0800
From: Chao Yu <yuchao0@...wei.com>
To: Jaegeuk Kim <jaegeuk@...nel.org>
CC: <linux-kernel@...r.kernel.org>,
<linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [PATCH v6] f2fs: compress: add compress_inode to cache
compressed blocks
On 2021/5/27 9:58, Chao Yu wrote:
> On 2021/5/27 9:41, Jaegeuk Kim wrote:
>> On 05/27, Chao Yu wrote:
>>> On 2021/5/27 9:29, Jaegeuk Kim wrote:
>>>> On 05/27, Chao Yu wrote:
>>>>> On 2021/5/26 23:46, Jaegeuk Kim wrote:
>>>>>> On 05/26, Chao Yu wrote:
>>>>>>> On 2021/5/26 21:26, Jaegeuk Kim wrote:
>>>>>>>> On 05/26, Chao Yu wrote:
>>>>>>>>> On 2021/5/25 22:01, Jaegeuk Kim wrote:
>>>>>>>>>> On 05/25, Chao Yu wrote:
>>>>>>>>>>> On 2021/5/25 21:02, Jaegeuk Kim wrote:
>>>>>>>>>>>> On 05/25, Jaegeuk Kim wrote:
>>>>>>>>>>>>> On 05/25, Chao Yu wrote:
>>>>>>>>>>>>>> Also, and queue this?
>>>>>>>>>>>>>
>>>>>>>>>>>>> Easy to get this?
>>>>>>>>>>>>
>>>>>>>>>>>> need GFP_NOFS?
>>>>>>>>>>>
>>>>>>>>>>> Not sure, I use __GFP_IO intentionally here to avoid __GFP_RECLAIM from
>>>>>>>>>>> GFP_NOFS, because in low memory case, I don't want to instead page cache
>>>>>>>>>>> of normal file with page cache of sbi->compress_inode.
>>>>>>>>>>>
>>>>>>>>>>> What is memory size in your vm?
>>>>>>>>>>
>>>>>>>>>> 4GB. If I set GFP_NOFS, I don't see the error anymore, at least.
>>>>>>>>>
>>>>>>>>> I applied below patch and don't see the warning message anymore.
>>>>>>>>>
>>>>>>>>> ---
>>>>>>>>> fs/f2fs/compress.c | 2 +-
>>>>>>>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>>>>>>>
>>>>>>>>> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
>>>>>>>>> index 701dd0f6f4ec..ed5b7fabc604 100644
>>>>>>>>> --- a/fs/f2fs/compress.c
>>>>>>>>> +++ b/fs/f2fs/compress.c
>>>>>>>>> @@ -1703,7 +1703,7 @@ void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
>>>>>>>>> avail_ram = si.totalram - si.totalhigh;
>>>>>>>>>
>>>>>>>>> /* free memory is lower than watermark, deny caching compress page */
>>>>>>>>> - if (free_ram <= sbi->compress_watermark / 100 * avail_ram)
>>>>>>>
>>>>>>> This is buggy, because sbi->compress_watermark equals to 20, so that
>>>>>>> sbi->compress_watermark / 100 * avail_ram always be zero...
>>>>>>>
>>>>>>> After this change, if free ram is lower, we may just skip caching
>>>>>>> compressed blocks here.
>>>>>>
>>>>>> What if compress_watermark is 5, or below?
>>>>>
>>>>> if (free_ram <= avail_ram / 100 * sbi->compress_watermark)
>>>>>
>>>>> E.g. if compress_watermark is 5, avail_ram is 1GB, then if free_ram is
>>>>> less then (1GB / 100 * 5 := 50 MB), we will skip caching.
>>>>
>>>> You're missing my point. Without this workaround, we should deal with memory
>>>> allocation.
>>>
>>> So you mean GFP_NOFS is still preferred to handle watermark-helpless case, right?
>>
>> Yes, IMO, that should work without watermark.
>
> Fine, could you please update patch directly in dev-test? then I could rebase
> to it.
Oh, I guess __GFP_NOWARN | GFP_NOIO could be used to avoid unneeded warning
message.
Thanks,
>
> Thanks,
>
>>
>>>
>>> Thanks,
>>>
>>>>
>>>>>
>>>>> Thanks,
>>>>>
>>>>>>
>>>>>>>
>>>>>>> Thanks,
>>>>>>>
>>>>>>>>> + if (free_ram <= avail_ram / 100 * sbi->compress_watermark)
>>>>>>>>
>>>>>>>> Do you mean avail_ram should be over 100? I don't think this addresses the root
>>>>>>>> cause?
>>>>>>>>
>>>>>>>>> return;
>>>>>>>>>
>>>>>>>>> /* cached page count exceed threshold, deny caching compress page */
>>>>>>>>> --
>>>>>>>>> 2.29.2
>>>>>>>>>
>>>>>>>>> Thanks,
>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> Thanks,
>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> [ 1204.287099] kworker/u17:0: page allocation failure: order:0, mode:0x40(__GFP_IO), nodemask=(null),cpuset=/,mems_allowed=0
>>>>>>>>>>>>> [ 1204.296932] CPU: 1 PID: 158 Comm: kworker/u17:0 Tainted: G OE 5.13.0-rc1-custom #1
>>>>>>>>>>>>> [ 1204.300746] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014
>>>>>>>>>>>>> [ 1204.303458] Workqueue: f2fs_post_read_wq f2fs_post_read_work [f2fs]
>>>>>>>>>>>>> [ 1204.305772] Call Trace:
>>>>>>>>>>>>> [ 1204.307103] dump_stack+0x7d/0x9c
>>>>>>>>>>>>> [ 1204.308613] warn_alloc.cold+0x7b/0xdf
>>>>>>>>>>>>> [ 1204.310167] __alloc_pages_slowpath.constprop.0+0xd57/0xd80
>>>>>>>>>>>>> [ 1204.312214] __alloc_pages+0x30e/0x330
>>>>>>>>>>>>> [ 1204.313780] alloc_pages+0x87/0x110
>>>>>>>>>>>>> [ 1204.315265] f2fs_cache_compressed_page+0x136/0x2d0 [f2fs]
>>>>>>>>>>>>> [ 1204.317142] ? dequeue_entity+0xdb/0x450
>>>>>>>>>>>>> [ 1204.318708] f2fs_end_read_compressed_page+0x5c/0x70 [f2fs]
>>>>>>>>>>>>> [ 1204.320659] f2fs_post_read_work+0x11f/0x180 [f2fs]
>>>>>>>>>>>>> [ 1204.322442] process_one_work+0x220/0x3c0
>>>>>>>>>>>>> [ 1204.324091] worker_thread+0x53/0x420
>>>>>>>>>>>>> [ 1204.325577] kthread+0x12f/0x150
>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On 2021/5/20 19:51, Chao Yu wrote:
>>>>>>>>>>>>>>> From: Chao Yu <yuchao0@...wei.com>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Support to use address space of inner inode to cache compressed block,
>>>>>>>>>>>>>>> in order to improve cache hit ratio of random read.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Signed-off-by: Chao Yu <yuchao0@...wei.com>
>>>>>>>>>>>>>>> ---
>>>>>>>>>>>>>>> v6:
>>>>>>>>>>>>>>> - fix to cover COMPRESS_MAPPING() with CONFIG_F2FS_FS_COMPRESSION
>>>>>>>>>>>>>>> Documentation/filesystems/f2fs.rst | 3 +
>>>>>>>>>>>>>>> fs/f2fs/compress.c | 180 ++++++++++++++++++++++++++++-
>>>>>>>>>>>>>>> fs/f2fs/data.c | 41 ++++++-
>>>>>>>>>>>>>>> fs/f2fs/debug.c | 13 +++
>>>>>>>>>>>>>>> fs/f2fs/f2fs.h | 71 +++++++++++-
>>>>>>>>>>>>>>> fs/f2fs/gc.c | 1 +
>>>>>>>>>>>>>>> fs/f2fs/inode.c | 21 +++-
>>>>>>>>>>>>>>> fs/f2fs/segment.c | 6 +-
>>>>>>>>>>>>>>> fs/f2fs/super.c | 35 +++++-
>>>>>>>>>>>>>>> include/linux/f2fs_fs.h | 1 +
>>>>>>>>>>>>>>> 10 files changed, 358 insertions(+), 14 deletions(-)
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
>>>>>>>>>>>>>>> index 992bf91eeec8..809c4d0a696f 100644
>>>>>>>>>>>>>>> --- a/Documentation/filesystems/f2fs.rst
>>>>>>>>>>>>>>> +++ b/Documentation/filesystems/f2fs.rst
>>>>>>>>>>>>>>> @@ -289,6 +289,9 @@ compress_mode=%s Control file compression mode. This supports "fs" and "user"
>>>>>>>>>>>>>>> choosing the target file and the timing. The user can do manual
>>>>>>>>>>>>>>> compression/decompression on the compression enabled files using
>>>>>>>>>>>>>>> ioctls.
>>>>>>>>>>>>>>> +compress_cache Support to use address space of a filesystem managed inode to
>>>>>>>>>>>>>>> + cache compressed block, in order to improve cache hit ratio of
>>>>>>>>>>>>>>> + random read.
>>>>>>>>>>>>>>> inlinecrypt When possible, encrypt/decrypt the contents of encrypted
>>>>>>>>>>>>>>> files using the blk-crypto framework rather than
>>>>>>>>>>>>>>> filesystem-layer encryption. This allows the use of
>>>>>>>>>>>>>>> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
>>>>>>>>>>>>>>> index d4f7371fb0d8..25e785e0d9fc 100644
>>>>>>>>>>>>>>> --- a/fs/f2fs/compress.c
>>>>>>>>>>>>>>> +++ b/fs/f2fs/compress.c
>>>>>>>>>>>>>>> @@ -12,9 +12,11 @@
>>>>>>>>>>>>>>> #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;
>>>>>>>>>>>>>>> @@ -736,7 +738,7 @@ static int f2fs_compress_pages(struct compress_ctx *cc)
>>>>>>>>>>>>>>> return ret;
>>>>>>>>>>>>>>> }
>>>>>>>>>>>>>>> -static void f2fs_decompress_cluster(struct decompress_io_ctx *dic)
>>>>>>>>>>>>>>> +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);
>>>>>>>>>>>>>>> @@ -835,7 +837,8 @@ static void f2fs_decompress_cluster(struct decompress_io_ctx *dic)
>>>>>>>>>>>>>>> * 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)
>>>>>>>>>>>>>>> +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);
>>>>>>>>>>>>>>> @@ -845,6 +848,9 @@ void f2fs_end_read_compressed_page(struct page *page, bool failed)
>>>>>>>>>>>>>>> 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);
>>>>>>>>>>>>>>> @@ -1660,6 +1666,176 @@ void f2fs_put_page_dic(struct page *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;
>>>>>>>>>>>>>>> + struct sysinfo si;
>>>>>>>>>>>>>>> + unsigned long free_ram, avail_ram;
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> + if (!test_opt(sbi, COMPRESS_CACHE))
>>>>>>>>>>>>>>> + return;
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> + if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC_ENHANCE_READ))
>>>>>>>>>>>>>>> + return;
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> + si_meminfo(&si);
>>>>>>>>>>>>>>> + free_ram = si.freeram;
>>>>>>>>>>>>>>> + avail_ram = si.totalram - si.totalhigh;
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> + /* free memory is lower than watermark, deny caching compress page */
>>>>>>>>>>>>>>> + if (free_ram <= sbi->compress_watermark / 100 * avail_ram)
>>>>>>>>>>>>>>> + return;
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> + /* cached page count exceed threshold, deny caching compress page */
>>>>>>>>>>>>>>> + if (COMPRESS_MAPPING(sbi)->nrpages >=
>>>>>>>>>>>>>>> + free_ram / 100 * sbi->compress_percent)
>>>>>>>>>>>>>>> + return;
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> + cpage = find_get_page(COMPRESS_MAPPING(sbi), blkaddr);
>>>>>>>>>>>>>>> + if (cpage) {
>>>>>>>>>>>>>>> + f2fs_put_page(cpage, 0);
>>>>>>>>>>>>>>> + return;
>>>>>>>>>>>>>>> + }
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> + cpage = alloc_page(__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;
>>>>>>>>>>>>>>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
>>>>>>>>>>>>>>> index d4795eda12fa..3058c7e28b11 100644
>>>>>>>>>>>>>>> --- a/fs/f2fs/data.c
>>>>>>>>>>>>>>> +++ b/fs/f2fs/data.c
>>>>>>>>>>>>>>> @@ -132,7 +132,7 @@ static void f2fs_finish_read_bio(struct bio *bio)
>>>>>>>>>>>>>>> if (f2fs_is_compressed_page(page)) {
>>>>>>>>>>>>>>> if (bio->bi_status)
>>>>>>>>>>>>>>> - f2fs_end_read_compressed_page(page, true);
>>>>>>>>>>>>>>> + f2fs_end_read_compressed_page(page, true, 0);
>>>>>>>>>>>>>>> f2fs_put_page_dic(page);
>>>>>>>>>>>>>>> continue;
>>>>>>>>>>>>>>> }
>>>>>>>>>>>>>>> @@ -228,15 +228,19 @@ static void f2fs_handle_step_decompress(struct bio_post_read_ctx *ctx)
>>>>>>>>>>>>>>> struct bio_vec *bv;
>>>>>>>>>>>>>>> struct bvec_iter_all iter_all;
>>>>>>>>>>>>>>> bool all_compressed = true;
>>>>>>>>>>>>>>> + block_t blkaddr = SECTOR_TO_BLOCK(ctx->bio->bi_iter.bi_sector);
>>>>>>>>>>>>>>> bio_for_each_segment_all(bv, ctx->bio, iter_all) {
>>>>>>>>>>>>>>> struct page *page = bv->bv_page;
>>>>>>>>>>>>>>> /* PG_error was set if decryption failed. */
>>>>>>>>>>>>>>> if (f2fs_is_compressed_page(page))
>>>>>>>>>>>>>>> - f2fs_end_read_compressed_page(page, PageError(page));
>>>>>>>>>>>>>>> + f2fs_end_read_compressed_page(page, PageError(page),
>>>>>>>>>>>>>>> + blkaddr);
>>>>>>>>>>>>>>> else
>>>>>>>>>>>>>>> all_compressed = false;
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> + blkaddr++;
>>>>>>>>>>>>>>> }
>>>>>>>>>>>>>>> /*
>>>>>>>>>>>>>>> @@ -1352,9 +1356,11 @@ static int __allocate_data_block(struct dnode_of_data *dn, int seg_type)
>>>>>>>>>>>>>>> old_blkaddr = dn->data_blkaddr;
>>>>>>>>>>>>>>> f2fs_allocate_data_block(sbi, NULL, old_blkaddr, &dn->data_blkaddr,
>>>>>>>>>>>>>>> &sum, seg_type, NULL);
>>>>>>>>>>>>>>> - if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO)
>>>>>>>>>>>>>>> + if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO) {
>>>>>>>>>>>>>>> invalidate_mapping_pages(META_MAPPING(sbi),
>>>>>>>>>>>>>>> old_blkaddr, old_blkaddr);
>>>>>>>>>>>>>>> + f2fs_invalidate_compress_page(sbi, old_blkaddr);
>>>>>>>>>>>>>>> + }
>>>>>>>>>>>>>>> f2fs_update_data_blkaddr(dn, dn->data_blkaddr);
>>>>>>>>>>>>>>> /*
>>>>>>>>>>>>>>> @@ -2174,7 +2180,7 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
>>>>>>>>>>>>>>> goto out_put_dnode;
>>>>>>>>>>>>>>> }
>>>>>>>>>>>>>>> - for (i = 0; i < dic->nr_cpages; i++) {
>>>>>>>>>>>>>>> + for (i = 0; i < cc->nr_cpages; i++) {
>>>>>>>>>>>>>>> struct page *page = dic->cpages[i];
>>>>>>>>>>>>>>> block_t blkaddr;
>>>>>>>>>>>>>>> struct bio_post_read_ctx *ctx;
>>>>>>>>>>>>>>> @@ -2182,6 +2188,14 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
>>>>>>>>>>>>>>> blkaddr = data_blkaddr(dn.inode, dn.node_page,
>>>>>>>>>>>>>>> dn.ofs_in_node + i + 1);
>>>>>>>>>>>>>>> + f2fs_wait_on_block_writeback(inode, blkaddr);
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> + if (f2fs_load_compressed_page(sbi, page, blkaddr)) {
>>>>>>>>>>>>>>> + if (atomic_dec_and_test(&dic->remaining_pages))
>>>>>>>>>>>>>>> + f2fs_decompress_cluster(dic);
>>>>>>>>>>>>>>> + continue;
>>>>>>>>>>>>>>> + }
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> if (bio && (!page_is_mergeable(sbi, bio,
>>>>>>>>>>>>>>> *last_block_in_bio, blkaddr) ||
>>>>>>>>>>>>>>> !f2fs_crypt_mergeable_bio(bio, inode, page->index, NULL))) {
>>>>>>>>>>>>>>> @@ -2203,8 +2217,6 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
>>>>>>>>>>>>>>> }
>>>>>>>>>>>>>>> }
>>>>>>>>>>>>>>> - f2fs_wait_on_block_writeback(inode, blkaddr);
>>>>>>>>>>>>>>> -
>>>>>>>>>>>>>>> if (bio_add_page(bio, page, blocksize, 0) < blocksize)
>>>>>>>>>>>>>>> goto submit_and_realloc;
>>>>>>>>>>>>>>> @@ -3618,6 +3630,13 @@ void f2fs_invalidate_page(struct page *page, unsigned int offset,
>>>>>>>>>>>>>>> clear_page_private_gcing(page);
>>>>>>>>>>>>>>> + if (test_opt(sbi, COMPRESS_CACHE)) {
>>>>>>>>>>>>>>> + if (f2fs_compressed_file(inode))
>>>>>>>>>>>>>>> + f2fs_invalidate_compress_pages(sbi, inode->i_ino);
>>>>>>>>>>>>>>> + if (inode->i_ino == F2FS_COMPRESS_INO(sbi))
>>>>>>>>>>>>>>> + clear_page_private_data(page);
>>>>>>>>>>>>>>> + }
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> if (page_private_atomic(page))
>>>>>>>>>>>>>>> return f2fs_drop_inmem_page(inode, page);
>>>>>>>>>>>>>>> @@ -3635,6 +3654,16 @@ int f2fs_release_page(struct page *page, gfp_t wait)
>>>>>>>>>>>>>>> if (page_private_atomic(page))
>>>>>>>>>>>>>>> return 0;
>>>>>>>>>>>>>>> + if (test_opt(F2FS_P_SB(page), COMPRESS_CACHE)) {
>>>>>>>>>>>>>>> + struct f2fs_sb_info *sbi = F2FS_P_SB(page);
>>>>>>>>>>>>>>> + struct inode *inode = page->mapping->host;
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> + if (f2fs_compressed_file(inode))
>>>>>>>>>>>>>>> + f2fs_invalidate_compress_pages(sbi, inode->i_ino);
>>>>>>>>>>>>>>> + if (inode->i_ino == F2FS_COMPRESS_INO(sbi))
>>>>>>>>>>>>>>> + clear_page_private_data(page);
>>>>>>>>>>>>>>> + }
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> clear_page_private_gcing(page);
>>>>>>>>>>>>>>> detach_page_private(page);
>>>>>>>>>>>>>>> diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
>>>>>>>>>>>>>>> index c03949a7ccff..833325038ef3 100644
>>>>>>>>>>>>>>> --- a/fs/f2fs/debug.c
>>>>>>>>>>>>>>> +++ b/fs/f2fs/debug.c
>>>>>>>>>>>>>>> @@ -152,6 +152,12 @@ static void update_general_status(struct f2fs_sb_info *sbi)
>>>>>>>>>>>>>>> si->node_pages = NODE_MAPPING(sbi)->nrpages;
>>>>>>>>>>>>>>> if (sbi->meta_inode)
>>>>>>>>>>>>>>> si->meta_pages = META_MAPPING(sbi)->nrpages;
>>>>>>>>>>>>>>> +#ifdef CONFIG_F2FS_FS_COMPRESSION
>>>>>>>>>>>>>>> + if (sbi->compress_inode) {
>>>>>>>>>>>>>>> + si->compress_pages = COMPRESS_MAPPING(sbi)->nrpages;
>>>>>>>>>>>>>>> + si->compress_page_hit = atomic_read(&sbi->compress_page_hit);
>>>>>>>>>>>>>>> + }
>>>>>>>>>>>>>>> +#endif
>>>>>>>>>>>>>>> si->nats = NM_I(sbi)->nat_cnt[TOTAL_NAT];
>>>>>>>>>>>>>>> si->dirty_nats = NM_I(sbi)->nat_cnt[DIRTY_NAT];
>>>>>>>>>>>>>>> si->sits = MAIN_SEGS(sbi);
>>>>>>>>>>>>>>> @@ -309,6 +315,12 @@ static void update_mem_info(struct f2fs_sb_info *sbi)
>>>>>>>>>>>>>>> si->page_mem += (unsigned long long)npages << PAGE_SHIFT;
>>>>>>>>>>>>>>> }
>>>>>>>>>>>>>>> +#ifdef CONFIG_F2FS_FS_COMPRESSION
>>>>>>>>>>>>>>> + if (sbi->compress_inode) {
>>>>>>>>>>>>>>> + unsigned npages = COMPRESS_MAPPING(sbi)->nrpages;
>>>>>>>>>>>>>>> + si->page_mem += (unsigned long long)npages << PAGE_SHIFT;
>>>>>>>>>>>>>>> + }
>>>>>>>>>>>>>>> +#endif
>>>>>>>>>>>>>>> }
>>>>>>>>>>>>>>> static int stat_show(struct seq_file *s, void *v)
>>>>>>>>>>>>>>> @@ -476,6 +488,7 @@ static int stat_show(struct seq_file *s, void *v)
>>>>>>>>>>>>>>> "volatile IO: %4d (Max. %4d)\n",
>>>>>>>>>>>>>>> si->inmem_pages, si->aw_cnt, si->max_aw_cnt,
>>>>>>>>>>>>>>> si->vw_cnt, si->max_vw_cnt);
>>>>>>>>>>>>>>> + seq_printf(s, " - compress: %4d, hit:%8d\n", si->compress_pages, si->compress_page_hit);
>>>>>>>>>>>>>>> seq_printf(s, " - nodes: %4d in %4d\n",
>>>>>>>>>>>>>>> si->ndirty_node, si->node_pages);
>>>>>>>>>>>>>>> seq_printf(s, " - dents: %4d in dirs:%4d (%4d)\n",
>>>>>>>>>>>>>>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>>>>>>>>>>>>>>> index c0bead0df66a..70c0bd563732 100644
>>>>>>>>>>>>>>> --- a/fs/f2fs/f2fs.h
>>>>>>>>>>>>>>> +++ b/fs/f2fs/f2fs.h
>>>>>>>>>>>>>>> @@ -98,6 +98,7 @@ extern const char *f2fs_fault_name[FAULT_MAX];
>>>>>>>>>>>>>>> #define F2FS_MOUNT_ATGC 0x08000000
>>>>>>>>>>>>>>> #define F2FS_MOUNT_MERGE_CHECKPOINT 0x10000000
>>>>>>>>>>>>>>> #define F2FS_MOUNT_GC_MERGE 0x20000000
>>>>>>>>>>>>>>> +#define F2FS_MOUNT_COMPRESS_CACHE 0x40000000
>>>>>>>>>>>>>>> #define F2FS_OPTION(sbi) ((sbi)->mount_opt)
>>>>>>>>>>>>>>> #define clear_opt(sbi, option) (F2FS_OPTION(sbi).opt &= ~F2FS_MOUNT_##option)
>>>>>>>>>>>>>>> @@ -1371,6 +1372,37 @@ PAGE_PRIVATE_CLEAR_FUNC(gcing, ONGOING_MIGRATION);
>>>>>>>>>>>>>>> PAGE_PRIVATE_CLEAR_FUNC(atomic, ATOMIC_WRITE);
>>>>>>>>>>>>>>> PAGE_PRIVATE_CLEAR_FUNC(dummy, DUMMY_WRITE);
>>>>>>>>>>>>>>> +static inline unsigned long get_page_private_data(struct page *page)
>>>>>>>>>>>>>>> +{
>>>>>>>>>>>>>>> + unsigned long data = page_private(page);
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> + if (!test_bit(PAGE_PRIVATE_NOT_POINTER, &data))
>>>>>>>>>>>>>>> + return 0;
>>>>>>>>>>>>>>> + return data >> PAGE_PRIVATE_MAX;
>>>>>>>>>>>>>>> +}
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> +static inline void set_page_private_data(struct page *page, unsigned long data)
>>>>>>>>>>>>>>> +{
>>>>>>>>>>>>>>> + if (!PagePrivate(page)) {
>>>>>>>>>>>>>>> + get_page(page);
>>>>>>>>>>>>>>> + SetPagePrivate(page);
>>>>>>>>>>>>>>> + }
>>>>>>>>>>>>>>> + set_bit(PAGE_PRIVATE_NOT_POINTER, &page_private(page));
>>>>>>>>>>>>>>> + page_private(page) |= data << PAGE_PRIVATE_MAX;
>>>>>>>>>>>>>>> +}
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> +static inline void clear_page_private_data(struct page *page)
>>>>>>>>>>>>>>> +{
>>>>>>>>>>>>>>> + page_private(page) &= (1 << PAGE_PRIVATE_MAX) - 1;
>>>>>>>>>>>>>>> + if (page_private(page) == 1 << PAGE_PRIVATE_NOT_POINTER) {
>>>>>>>>>>>>>>> + set_page_private(page, 0);
>>>>>>>>>>>>>>> + if (PagePrivate(page)) {
>>>>>>>>>>>>>>> + ClearPagePrivate(page);
>>>>>>>>>>>>>>> + put_page(page);
>>>>>>>>>>>>>>> + }
>>>>>>>>>>>>>>> + }
>>>>>>>>>>>>>>> +}
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> /* For compression */
>>>>>>>>>>>>>>> enum compress_algorithm_type {
>>>>>>>>>>>>>>> COMPRESS_LZO,
>>>>>>>>>>>>>>> @@ -1385,6 +1417,9 @@ enum compress_flag {
>>>>>>>>>>>>>>> COMPRESS_MAX_FLAG,
>>>>>>>>>>>>>>> };
>>>>>>>>>>>>>>> +#define COMPRESS_WATERMARK 20
>>>>>>>>>>>>>>> +#define COMPRESS_PERCENT 20
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> #define COMPRESS_DATA_RESERVED_SIZE 4
>>>>>>>>>>>>>>> struct compress_data {
>>>>>>>>>>>>>>> __le32 clen; /* compressed data size */
>>>>>>>>>>>>>>> @@ -1694,6 +1729,12 @@ struct f2fs_sb_info {
>>>>>>>>>>>>>>> u64 compr_written_block;
>>>>>>>>>>>>>>> u64 compr_saved_block;
>>>>>>>>>>>>>>> u32 compr_new_inode;
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> + /* For compressed block cache */
>>>>>>>>>>>>>>> + struct inode *compress_inode; /* cache compressed blocks */
>>>>>>>>>>>>>>> + unsigned int compress_percent; /* cache page percentage */
>>>>>>>>>>>>>>> + unsigned int compress_watermark; /* cache page watermark */
>>>>>>>>>>>>>>> + atomic_t compress_page_hit; /* cache hit count */
>>>>>>>>>>>>>>> #endif
>>>>>>>>>>>>>>> };
>>>>>>>>>>>>>>> @@ -3660,7 +3701,8 @@ struct f2fs_stat_info {
>>>>>>>>>>>>>>> unsigned int bimodal, avg_vblocks;
>>>>>>>>>>>>>>> int util_free, util_valid, util_invalid;
>>>>>>>>>>>>>>> int rsvd_segs, overp_segs;
>>>>>>>>>>>>>>> - int dirty_count, node_pages, meta_pages;
>>>>>>>>>>>>>>> + int dirty_count, node_pages, meta_pages, compress_pages;
>>>>>>>>>>>>>>> + int compress_page_hit;
>>>>>>>>>>>>>>> int prefree_count, call_count, cp_count, bg_cp_count;
>>>>>>>>>>>>>>> int tot_segs, node_segs, data_segs, free_segs, free_secs;
>>>>>>>>>>>>>>> int bg_node_segs, bg_data_segs;
>>>>>>>>>>>>>>> @@ -3996,7 +4038,9 @@ void f2fs_compress_write_end_io(struct bio *bio, struct page *page);
>>>>>>>>>>>>>>> bool f2fs_is_compress_backend_ready(struct inode *inode);
>>>>>>>>>>>>>>> int f2fs_init_compress_mempool(void);
>>>>>>>>>>>>>>> void f2fs_destroy_compress_mempool(void);
>>>>>>>>>>>>>>> -void f2fs_end_read_compressed_page(struct page *page, bool failed);
>>>>>>>>>>>>>>> +void f2fs_decompress_cluster(struct decompress_io_ctx *dic);
>>>>>>>>>>>>>>> +void f2fs_end_read_compressed_page(struct page *page, bool failed,
>>>>>>>>>>>>>>> + block_t blkaddr);
>>>>>>>>>>>>>>> bool f2fs_cluster_is_empty(struct compress_ctx *cc);
>>>>>>>>>>>>>>> bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index);
>>>>>>>>>>>>>>> void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page);
>>>>>>>>>>>>>>> @@ -4014,10 +4058,19 @@ void f2fs_put_page_dic(struct page *page);
>>>>>>>>>>>>>>> int f2fs_init_compress_ctx(struct compress_ctx *cc);
>>>>>>>>>>>>>>> void f2fs_destroy_compress_ctx(struct compress_ctx *cc, bool reuse);
>>>>>>>>>>>>>>> void f2fs_init_compress_info(struct f2fs_sb_info *sbi);
>>>>>>>>>>>>>>> +int f2fs_init_compress_inode(struct f2fs_sb_info *sbi);
>>>>>>>>>>>>>>> +void f2fs_destroy_compress_inode(struct f2fs_sb_info *sbi);
>>>>>>>>>>>>>>> int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi);
>>>>>>>>>>>>>>> void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi);
>>>>>>>>>>>>>>> int __init f2fs_init_compress_cache(void);
>>>>>>>>>>>>>>> void f2fs_destroy_compress_cache(void);
>>>>>>>>>>>>>>> +struct address_space *COMPRESS_MAPPING(struct f2fs_sb_info *sbi);
>>>>>>>>>>>>>>> +void f2fs_invalidate_compress_page(struct f2fs_sb_info *sbi, block_t blkaddr);
>>>>>>>>>>>>>>> +void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
>>>>>>>>>>>>>>> + nid_t ino, block_t blkaddr);
>>>>>>>>>>>>>>> +bool f2fs_load_compressed_page(struct f2fs_sb_info *sbi, struct page *page,
>>>>>>>>>>>>>>> + block_t blkaddr);
>>>>>>>>>>>>>>> +void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi, nid_t ino);
>>>>>>>>>>>>>>> #define inc_compr_inode_stat(inode) \
>>>>>>>>>>>>>>> do { \
>>>>>>>>>>>>>>> struct f2fs_sb_info *sbi = F2FS_I_SB(inode); \
>>>>>>>>>>>>>>> @@ -4046,7 +4099,9 @@ static inline struct page *f2fs_compress_control_page(struct page *page)
>>>>>>>>>>>>>>> }
>>>>>>>>>>>>>>> static inline int f2fs_init_compress_mempool(void) { return 0; }
>>>>>>>>>>>>>>> static inline void f2fs_destroy_compress_mempool(void) { }
>>>>>>>>>>>>>>> -static inline void f2fs_end_read_compressed_page(struct page *page, bool failed)
>>>>>>>>>>>>>>> +static inline void f2fs_decompress_cluster(struct decompress_io_ctx *dic) { }
>>>>>>>>>>>>>>> +static inline void f2fs_end_read_compressed_page(struct page *page,
>>>>>>>>>>>>>>> + bool failed, block_t blkaddr)
>>>>>>>>>>>>>>> {
>>>>>>>>>>>>>>> WARN_ON_ONCE(1);
>>>>>>>>>>>>>>> }
>>>>>>>>>>>>>>> @@ -4054,10 +4109,20 @@ static inline void f2fs_put_page_dic(struct page *page)
>>>>>>>>>>>>>>> {
>>>>>>>>>>>>>>> WARN_ON_ONCE(1);
>>>>>>>>>>>>>>> }
>>>>>>>>>>>>>>> +static inline int f2fs_init_compress_inode(struct f2fs_sb_info *sbi) { return 0; }
>>>>>>>>>>>>>>> +static inline void f2fs_destroy_compress_inode(struct f2fs_sb_info *sbi) { }
>>>>>>>>>>>>>>> static inline int f2fs_init_page_array_cache(struct f2fs_sb_info *sbi) { return 0; }
>>>>>>>>>>>>>>> static inline void f2fs_destroy_page_array_cache(struct f2fs_sb_info *sbi) { }
>>>>>>>>>>>>>>> static inline int __init f2fs_init_compress_cache(void) { return 0; }
>>>>>>>>>>>>>>> static inline void f2fs_destroy_compress_cache(void) { }
>>>>>>>>>>>>>>> +static inline void f2fs_invalidate_compress_page(struct f2fs_sb_info *sbi,
>>>>>>>>>>>>>>> + block_t blkaddr) { }
>>>>>>>>>>>>>>> +static inline void f2fs_cache_compressed_page(struct f2fs_sb_info *sbi,
>>>>>>>>>>>>>>> + struct page *page, nid_t ino, block_t blkaddr) { }
>>>>>>>>>>>>>>> +static inline bool f2fs_load_compressed_page(struct f2fs_sb_info *sbi,
>>>>>>>>>>>>>>> + struct page *page, block_t blkaddr) { return false; }
>>>>>>>>>>>>>>> +static inline void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi,
>>>>>>>>>>>>>>> + nid_t ino) { }
>>>>>>>>>>>>>>> #define inc_compr_inode_stat(inode) do { } while (0)
>>>>>>>>>>>>>>> #endif
>>>>>>>>>>>>>>> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
>>>>>>>>>>>>>>> index bcb3b488dbca..f3d2bed746b0 100644
>>>>>>>>>>>>>>> --- a/fs/f2fs/gc.c
>>>>>>>>>>>>>>> +++ b/fs/f2fs/gc.c
>>>>>>>>>>>>>>> @@ -1261,6 +1261,7 @@ static int move_data_block(struct inode *inode, block_t bidx,
>>>>>>>>>>>>>>> f2fs_put_page(mpage, 1);
>>>>>>>>>>>>>>> invalidate_mapping_pages(META_MAPPING(fio.sbi),
>>>>>>>>>>>>>>> fio.old_blkaddr, fio.old_blkaddr);
>>>>>>>>>>>>>>> + f2fs_invalidate_compress_page(fio.sbi, fio.old_blkaddr);
>>>>>>>>>>>>>>> set_page_dirty(fio.encrypted_page);
>>>>>>>>>>>>>>> if (clear_page_dirty_for_io(fio.encrypted_page))
>>>>>>>>>>>>>>> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
>>>>>>>>>>>>>>> index cbda7ca3b3be..9141147b5bb0 100644
>>>>>>>>>>>>>>> --- a/fs/f2fs/inode.c
>>>>>>>>>>>>>>> +++ b/fs/f2fs/inode.c
>>>>>>>>>>>>>>> @@ -18,6 +18,10 @@
>>>>>>>>>>>>>>> #include <trace/events/f2fs.h>
>>>>>>>>>>>>>>> +#ifdef CONFIG_F2FS_FS_COMPRESSION
>>>>>>>>>>>>>>> +extern const struct address_space_operations f2fs_compress_aops;
>>>>>>>>>>>>>>> +#endif
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> void f2fs_mark_inode_dirty_sync(struct inode *inode, bool sync)
>>>>>>>>>>>>>>> {
>>>>>>>>>>>>>>> if (is_inode_flag_set(inode, FI_NEW_INODE))
>>>>>>>>>>>>>>> @@ -494,6 +498,11 @@ struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
>>>>>>>>>>>>>>> if (ino == F2FS_NODE_INO(sbi) || ino == F2FS_META_INO(sbi))
>>>>>>>>>>>>>>> goto make_now;
>>>>>>>>>>>>>>> +#ifdef CONFIG_F2FS_FS_COMPRESSION
>>>>>>>>>>>>>>> + if (ino == F2FS_COMPRESS_INO(sbi))
>>>>>>>>>>>>>>> + goto make_now;
>>>>>>>>>>>>>>> +#endif
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> ret = do_read_inode(inode);
>>>>>>>>>>>>>>> if (ret)
>>>>>>>>>>>>>>> goto bad_inode;
>>>>>>>>>>>>>>> @@ -504,6 +513,12 @@ struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
>>>>>>>>>>>>>>> } else if (ino == F2FS_META_INO(sbi)) {
>>>>>>>>>>>>>>> inode->i_mapping->a_ops = &f2fs_meta_aops;
>>>>>>>>>>>>>>> mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
>>>>>>>>>>>>>>> + } else if (ino == F2FS_COMPRESS_INO(sbi)) {
>>>>>>>>>>>>>>> +#ifdef CONFIG_F2FS_FS_COMPRESSION
>>>>>>>>>>>>>>> + inode->i_mapping->a_ops = &f2fs_compress_aops;
>>>>>>>>>>>>>>> +#endif
>>>>>>>>>>>>>>> + mapping_set_gfp_mask(inode->i_mapping,
>>>>>>>>>>>>>>> + GFP_NOFS | __GFP_HIGHMEM | __GFP_MOVABLE);
>>>>>>>>>>>>>>> } else if (S_ISREG(inode->i_mode)) {
>>>>>>>>>>>>>>> inode->i_op = &f2fs_file_inode_operations;
>>>>>>>>>>>>>>> inode->i_fop = &f2fs_file_operations;
>>>>>>>>>>>>>>> @@ -723,8 +738,12 @@ void f2fs_evict_inode(struct inode *inode)
>>>>>>>>>>>>>>> trace_f2fs_evict_inode(inode);
>>>>>>>>>>>>>>> truncate_inode_pages_final(&inode->i_data);
>>>>>>>>>>>>>>> + if (test_opt(sbi, COMPRESS_CACHE) && f2fs_compressed_file(inode))
>>>>>>>>>>>>>>> + f2fs_invalidate_compress_pages(sbi, inode->i_ino);
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> if (inode->i_ino == F2FS_NODE_INO(sbi) ||
>>>>>>>>>>>>>>> - inode->i_ino == F2FS_META_INO(sbi))
>>>>>>>>>>>>>>> + inode->i_ino == F2FS_META_INO(sbi) ||
>>>>>>>>>>>>>>> + inode->i_ino == F2FS_COMPRESS_INO(sbi))
>>>>>>>>>>>>>>> goto out_clear;
>>>>>>>>>>>>>>> f2fs_bug_on(sbi, get_dirty_pages(inode));
>>>>>>>>>>>>>>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
>>>>>>>>>>>>>>> index 8668df7870d0..406a6b244782 100644
>>>>>>>>>>>>>>> --- a/fs/f2fs/segment.c
>>>>>>>>>>>>>>> +++ b/fs/f2fs/segment.c
>>>>>>>>>>>>>>> @@ -2322,6 +2322,7 @@ void f2fs_invalidate_blocks(struct f2fs_sb_info *sbi, block_t addr)
>>>>>>>>>>>>>>> return;
>>>>>>>>>>>>>>> invalidate_mapping_pages(META_MAPPING(sbi), addr, addr);
>>>>>>>>>>>>>>> + f2fs_invalidate_compress_page(sbi, addr);
>>>>>>>>>>>>>>> /* add it into sit main buffer */
>>>>>>>>>>>>>>> down_write(&sit_i->sentry_lock);
>>>>>>>>>>>>>>> @@ -3469,9 +3470,11 @@ static void do_write_page(struct f2fs_summary *sum, struct f2fs_io_info *fio)
>>>>>>>>>>>>>>> reallocate:
>>>>>>>>>>>>>>> f2fs_allocate_data_block(fio->sbi, fio->page, fio->old_blkaddr,
>>>>>>>>>>>>>>> &fio->new_blkaddr, sum, type, fio);
>>>>>>>>>>>>>>> - if (GET_SEGNO(fio->sbi, fio->old_blkaddr) != NULL_SEGNO)
>>>>>>>>>>>>>>> + if (GET_SEGNO(fio->sbi, fio->old_blkaddr) != NULL_SEGNO) {
>>>>>>>>>>>>>>> invalidate_mapping_pages(META_MAPPING(fio->sbi),
>>>>>>>>>>>>>>> fio->old_blkaddr, fio->old_blkaddr);
>>>>>>>>>>>>>>> + f2fs_invalidate_compress_page(fio->sbi, fio->old_blkaddr);
>>>>>>>>>>>>>>> + }
>>>>>>>>>>>>>>> /* writeout dirty page into bdev */
>>>>>>>>>>>>>>> f2fs_submit_page_write(fio);
>>>>>>>>>>>>>>> @@ -3661,6 +3664,7 @@ void f2fs_do_replace_block(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
>>>>>>>>>>>>>>> if (GET_SEGNO(sbi, old_blkaddr) != NULL_SEGNO) {
>>>>>>>>>>>>>>> invalidate_mapping_pages(META_MAPPING(sbi),
>>>>>>>>>>>>>>> old_blkaddr, old_blkaddr);
>>>>>>>>>>>>>>> + f2fs_invalidate_compress_page(sbi, old_blkaddr);
>>>>>>>>>>>>>>> if (!from_gc)
>>>>>>>>>>>>>>> update_segment_mtime(sbi, old_blkaddr, 0);
>>>>>>>>>>>>>>> update_sit_entry(sbi, old_blkaddr, -1);
>>>>>>>>>>>>>>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
>>>>>>>>>>>>>>> index 096492caaa6b..5056b8cfe919 100644
>>>>>>>>>>>>>>> --- a/fs/f2fs/super.c
>>>>>>>>>>>>>>> +++ b/fs/f2fs/super.c
>>>>>>>>>>>>>>> @@ -150,6 +150,7 @@ enum {
>>>>>>>>>>>>>>> Opt_compress_extension,
>>>>>>>>>>>>>>> Opt_compress_chksum,
>>>>>>>>>>>>>>> Opt_compress_mode,
>>>>>>>>>>>>>>> + Opt_compress_cache,
>>>>>>>>>>>>>>> Opt_atgc,
>>>>>>>>>>>>>>> Opt_gc_merge,
>>>>>>>>>>>>>>> Opt_nogc_merge,
>>>>>>>>>>>>>>> @@ -224,6 +225,7 @@ static match_table_t f2fs_tokens = {
>>>>>>>>>>>>>>> {Opt_compress_extension, "compress_extension=%s"},
>>>>>>>>>>>>>>> {Opt_compress_chksum, "compress_chksum"},
>>>>>>>>>>>>>>> {Opt_compress_mode, "compress_mode=%s"},
>>>>>>>>>>>>>>> + {Opt_compress_cache, "compress_cache"},
>>>>>>>>>>>>>>> {Opt_atgc, "atgc"},
>>>>>>>>>>>>>>> {Opt_gc_merge, "gc_merge"},
>>>>>>>>>>>>>>> {Opt_nogc_merge, "nogc_merge"},
>>>>>>>>>>>>>>> @@ -1066,12 +1068,16 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
>>>>>>>>>>>>>>> }
>>>>>>>>>>>>>>> kfree(name);
>>>>>>>>>>>>>>> break;
>>>>>>>>>>>>>>> + case Opt_compress_cache:
>>>>>>>>>>>>>>> + set_opt(sbi, COMPRESS_CACHE);
>>>>>>>>>>>>>>> + break;
>>>>>>>>>>>>>>> #else
>>>>>>>>>>>>>>> case Opt_compress_algorithm:
>>>>>>>>>>>>>>> case Opt_compress_log_size:
>>>>>>>>>>>>>>> case Opt_compress_extension:
>>>>>>>>>>>>>>> case Opt_compress_chksum:
>>>>>>>>>>>>>>> case Opt_compress_mode:
>>>>>>>>>>>>>>> + case Opt_compress_cache:
>>>>>>>>>>>>>>> f2fs_info(sbi, "compression options not supported");
>>>>>>>>>>>>>>> break;
>>>>>>>>>>>>>>> #endif
>>>>>>>>>>>>>>> @@ -1403,6 +1409,8 @@ static void f2fs_put_super(struct super_block *sb)
>>>>>>>>>>>>>>> f2fs_bug_on(sbi, sbi->fsync_node_num);
>>>>>>>>>>>>>>> + f2fs_destroy_compress_inode(sbi);
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> iput(sbi->node_inode);
>>>>>>>>>>>>>>> sbi->node_inode = NULL;
>>>>>>>>>>>>>>> @@ -1672,6 +1680,9 @@ static inline void f2fs_show_compress_options(struct seq_file *seq,
>>>>>>>>>>>>>>> seq_printf(seq, ",compress_mode=%s", "fs");
>>>>>>>>>>>>>>> else if (F2FS_OPTION(sbi).compress_mode == COMPR_MODE_USER)
>>>>>>>>>>>>>>> seq_printf(seq, ",compress_mode=%s", "user");
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> + if (test_opt(sbi, COMPRESS_CACHE))
>>>>>>>>>>>>>>> + seq_puts(seq, ",compress_cache");
>>>>>>>>>>>>>>> }
>>>>>>>>>>>>>>> #endif
>>>>>>>>>>>>>>> @@ -1949,6 +1960,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
>>>>>>>>>>>>>>> bool disable_checkpoint = test_opt(sbi, DISABLE_CHECKPOINT);
>>>>>>>>>>>>>>> bool no_io_align = !F2FS_IO_ALIGNED(sbi);
>>>>>>>>>>>>>>> bool no_atgc = !test_opt(sbi, ATGC);
>>>>>>>>>>>>>>> + bool no_compress_cache = !test_opt(sbi, COMPRESS_CACHE);
>>>>>>>>>>>>>>> bool checkpoint_changed;
>>>>>>>>>>>>>>> #ifdef CONFIG_QUOTA
>>>>>>>>>>>>>>> int i, j;
>>>>>>>>>>>>>>> @@ -2041,6 +2053,12 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
>>>>>>>>>>>>>>> goto restore_opts;
>>>>>>>>>>>>>>> }
>>>>>>>>>>>>>>> + if (no_compress_cache == !!test_opt(sbi, COMPRESS_CACHE)) {
>>>>>>>>>>>>>>> + err = -EINVAL;
>>>>>>>>>>>>>>> + f2fs_warn(sbi, "switch compress_cache option is not allowed");
>>>>>>>>>>>>>>> + goto restore_opts;
>>>>>>>>>>>>>>> + }
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> if ((*flags & SB_RDONLY) && test_opt(sbi, DISABLE_CHECKPOINT)) {
>>>>>>>>>>>>>>> err = -EINVAL;
>>>>>>>>>>>>>>> f2fs_warn(sbi, "disabling checkpoint not compatible with read-only");
>>>>>>>>>>>>>>> @@ -3940,10 +3958,14 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>>>>>>>>>>>>>>> goto free_node_inode;
>>>>>>>>>>>>>>> }
>>>>>>>>>>>>>>> - err = f2fs_register_sysfs(sbi);
>>>>>>>>>>>>>>> + err = f2fs_init_compress_inode(sbi);
>>>>>>>>>>>>>>> if (err)
>>>>>>>>>>>>>>> goto free_root_inode;
>>>>>>>>>>>>>>> + err = f2fs_register_sysfs(sbi);
>>>>>>>>>>>>>>> + if (err)
>>>>>>>>>>>>>>> + goto free_compress_inode;
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> #ifdef CONFIG_QUOTA
>>>>>>>>>>>>>>> /* Enable quota usage during mount */
>>>>>>>>>>>>>>> if (f2fs_sb_has_quota_ino(sbi) && !f2fs_readonly(sb)) {
>>>>>>>>>>>>>>> @@ -4084,6 +4106,8 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
>>>>>>>>>>>>>>> /* evict some inodes being cached by GC */
>>>>>>>>>>>>>>> evict_inodes(sb);
>>>>>>>>>>>>>>> f2fs_unregister_sysfs(sbi);
>>>>>>>>>>>>>>> +free_compress_inode:
>>>>>>>>>>>>>>> + f2fs_destroy_compress_inode(sbi);
>>>>>>>>>>>>>>> free_root_inode:
>>>>>>>>>>>>>>> dput(sb->s_root);
>>>>>>>>>>>>>>> sb->s_root = NULL;
>>>>>>>>>>>>>>> @@ -4162,6 +4186,15 @@ static void kill_f2fs_super(struct super_block *sb)
>>>>>>>>>>>>>>> f2fs_stop_gc_thread(sbi);
>>>>>>>>>>>>>>> f2fs_stop_discard_thread(sbi);
>>>>>>>>>>>>>>> +#ifdef CONFIG_F2FS_FS_COMPRESSION
>>>>>>>>>>>>>>> + /*
>>>>>>>>>>>>>>> + * latter evict_inode() can bypass checking and invalidating
>>>>>>>>>>>>>>> + * compress inode cache.
>>>>>>>>>>>>>>> + */
>>>>>>>>>>>>>>> + if (test_opt(sbi, COMPRESS_CACHE))
>>>>>>>>>>>>>>> + truncate_inode_pages_final(COMPRESS_MAPPING(sbi));
>>>>>>>>>>>>>>> +#endif
>>>>>>>>>>>>>>> +
>>>>>>>>>>>>>>> if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
>>>>>>>>>>>>>>> !is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG)) {
>>>>>>>>>>>>>>> struct cp_control cpc = {
>>>>>>>>>>>>>>> diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
>>>>>>>>>>>>>>> index 5487a80617a3..0021ea8f7c3b 100644
>>>>>>>>>>>>>>> --- a/include/linux/f2fs_fs.h
>>>>>>>>>>>>>>> +++ b/include/linux/f2fs_fs.h
>>>>>>>>>>>>>>> @@ -34,6 +34,7 @@
>>>>>>>>>>>>>>> #define F2FS_ROOT_INO(sbi) ((sbi)->root_ino_num)
>>>>>>>>>>>>>>> #define F2FS_NODE_INO(sbi) ((sbi)->node_ino_num)
>>>>>>>>>>>>>>> #define F2FS_META_INO(sbi) ((sbi)->meta_ino_num)
>>>>>>>>>>>>>>> +#define F2FS_COMPRESS_INO(sbi) (NM_I(sbi)->max_nid)
>>>>>>>>>>>>>>> #define F2FS_MAX_QUOTAS 3
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>>> Linux-f2fs-devel mailing list
>>>>>>>>>>>>> Linux-f2fs-devel@...ts.sourceforge.net
>>>>>>>>>>>>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>> Linux-f2fs-devel mailing list
>>>>>>>>>>>> Linux-f2fs-devel@...ts.sourceforge.net
>>>>>>>>>>>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
>>>>>>>>>>>>
>>>>>>>>>> .
>>>>>>>>>>
>>>>>> .
>>>>>>
>>>> .
>>>>
>> .
>>
>
>
> _______________________________________________
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