Re: [f2fs-dev] [PATCH v6] f2fs: compress: add compress_inode to cache compressed blocks

[Chao Yu <yuchao0@huawei.com>]

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.

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@huawei.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@huawei.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@lists.sourceforge.net
>>>>>>>>>>>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> _______________________________________________
>>>>>>>>>>> Linux-f2fs-devel mailing list
>>>>>>>>>>> Linux-f2fs-devel@lists.sourceforge.net
>>>>>>>>>>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
>>>>>>>>>>>
>>>>>>>>> .
>>>>>>>>>
>>>>> .
>>>>>
>>> .
>>>
> .
>