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

[Chao Yu <yuchao0@huawei.com>]

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)
+	if (free_ram <= avail_ram / 100 * sbi->compress_watermark)
  		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
>>>
> .
>