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Date: Fri, 1 Nov 2019 09:45:18 -0700
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <yuchao0@...wei.com>
Cc: linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [RFC PATCH v3] f2fs: support data compression
On 11/01, Jaegeuk Kim wrote:
> On 11/01, Chao Yu wrote:
> > This patch tries to support compression in f2fs.
> >
> > - New term named cluster is defined as basic unit of compression, file can
> > be divided into multiple clusters logically. One cluster includes 4 << n
> > (n >= 0) logical pages, compression size is also cluster size, each of
> > cluster can be compressed or not.
> >
> > - In cluster metadata layout, one special flag is used to indicate cluster
> > is compressed one or normal one, for compressed cluster, following metadata
> > maps cluster to [1, 4 << n - 1] physical blocks, in where f2fs stores
> > data including compress header and compressed data.
> >
> > - In order to eliminate write amplification during overwrite, F2FS only
> > support compression on write-once file, data can be compressed only when
> > all logical blocks in file are valid and cluster compress ratio is lower
> > than specified threshold.
> >
> > - To enable compression on regular inode, there are three ways:
> > * chattr +c file
> > * chattr +c dir; touch dir/file
> > * mount w/ -o compress_extension=ext; touch file.ext
> >
> > Compress metadata layout:
> > [Dnode Structure]
> > +-----------------------------------------------+
> > | cluster 1 | cluster 2 | ......... | cluster N |
> > +-----------------------------------------------+
> > . . . .
> > . . . .
> > . Compressed Cluster . . Normal Cluster .
> > +----------+---------+---------+---------+ +---------+---------+---------+---------+
> > |compr flag| block 1 | block 2 | block 3 | | block 1 | block 2 | block 3 | block 4 |
> > +----------+---------+---------+---------+ +---------+---------+---------+---------+
> > . .
> > . .
> > . .
> > +-------------+-------------+----------+----------------------------+
> > | data length | data chksum | reserved | compressed data |
> > +-------------+-------------+----------+----------------------------+
> >
> > Changelog:
> >
> > 20190326:
> > - fix error handling of read_end_io().
> > - remove unneeded comments in f2fs_encrypt_one_page().
> >
> > 20190327:
> > - fix wrong use of f2fs_cluster_is_full() in f2fs_mpage_readpages().
> > - don't jump into loop directly to avoid uninitialized variables.
> > - add TODO tag in error path of f2fs_write_cache_pages().
> >
> > 20190328:
> > - fix wrong merge condition in f2fs_read_multi_pages().
> > - check compressed file in f2fs_post_read_required().
> >
> > 20190401
> > - allow overwrite on non-compressed cluster.
> > - check cluster meta before writing compressed data.
> >
> > 20190402
> > - don't preallocate blocks for compressed file.
> >
> > - add lz4 compress algorithm
> > - process multiple post read works in one workqueue
> > Now f2fs supports processing post read work in multiple workqueue,
> > it shows low performance due to schedule overhead of multiple
> > workqueue executing orderly.
> >
> > 20190921
> > - compress: support buffered overwrite
> > C: compress cluster flag
> > V: valid block address
> > N: NEW_ADDR
> >
> > One cluster contain 4 blocks
> >
> > before overwrite after overwrite
> >
> > - VVVV -> CVNN
> > - CVNN -> VVVV
> >
> > - CVNN -> CVNN
> > - CVNN -> CVVV
> >
> > - CVVV -> CVNN
> > - CVVV -> CVVV
> >
> > 20191029
> > - add kconfig F2FS_FS_COMPRESSION to isolate compression related
> > codes, add kconfig F2FS_FS_{LZO,LZ4} to cover backend algorithm.
> > note that: will remove lzo backend if Jaegeuk agreed that too.
> > - update codes according to Eric's comments.
> >
> > 20191101
> > - apply fixes from Jaegeuk
> >
> > [Jaegeuk Kim]
> > - add tracepoint for f2fs_{,de}compress_pages()
> > - fix many bugs and add some compression stats
> >
> > Signed-off-by: Chao Yu <yuchao0@...wei.com>
> > Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> > ---
> > Documentation/filesystems/f2fs.txt | 52 ++
> > fs/f2fs/Kconfig | 23 +
> > fs/f2fs/Makefile | 1 +
> > fs/f2fs/compress.c | 1098 ++++++++++++++++++++++++++++
> > fs/f2fs/data.c | 549 ++++++++++++--
> > fs/f2fs/debug.c | 6 +
> > fs/f2fs/f2fs.h | 245 ++++++-
> > fs/f2fs/file.c | 191 ++++-
> > fs/f2fs/inode.c | 43 ++
> > fs/f2fs/namei.c | 59 ++
> > fs/f2fs/segment.c | 5 +-
> > fs/f2fs/segment.h | 12 -
> > fs/f2fs/super.c | 112 ++-
> > fs/f2fs/sysfs.c | 7 +
> > include/linux/f2fs_fs.h | 11 +
> > include/trace/events/f2fs.h | 99 +++
> > 16 files changed, 2397 insertions(+), 116 deletions(-)
> > create mode 100644 fs/f2fs/compress.c
> >
> > diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt
> > index 29020af0cff9..228af93f850b 100644
> > --- a/Documentation/filesystems/f2fs.txt
> > +++ b/Documentation/filesystems/f2fs.txt
> > @@ -235,6 +235,17 @@ checkpoint=%s[:%u[%]] Set to "disable" to turn off checkpointing. Set to "en
> > hide up to all remaining free space. The actual space that
> > would be unusable can be viewed at /sys/fs/f2fs/<disk>/unusable
> > This space is reclaimed once checkpoint=enable.
> > +compress_algorithm=%s Control compress algorithm, currently f2fs supports "lzo"
> > + and "lz4" algorithm.
> > +compress_log_size=%u Support configuring compress cluster size, the size will
> > + be 4KB * (1 << %u), 16KB is minimum size, also it's
> > + default size.
> > +compress_extension=%s Support adding specified extension, so that f2fs can enable
> > + compression on those corresponding files, e.g. if all files
> > + with '.ext' has high compression rate, we can set the '.ext'
> > + on compression extension list and enable compression on
> > + these file by default rather than to enable it via ioctl.
> > + For other files, we can still enable compression via ioctl.
> >
> > ================================================================================
> > DEBUGFS ENTRIES
> > @@ -837,3 +848,44 @@ zero or random data, which is useful to the below scenario where:
> > 4. address = fibmap(fd, offset)
> > 5. open(blkdev)
> > 6. write(blkdev, address)
> > +
> > +Compression implementation
> > +--------------------------
> > +
> > +- New term named cluster is defined as basic unit of compression, file can
> > +be divided into multiple clusters logically. One cluster includes 4 << n
> > +(n >= 0) logical pages, compression size is also cluster size, each of
> > +cluster can be compressed or not.
> > +
> > +- In cluster metadata layout, one special block address is used to indicate
> > +cluster is compressed one or normal one, for compressed cluster, following
> > +metadata maps cluster to [1, 4 << n - 1] physical blocks, in where f2fs
> > +stores data including compress header and compressed data.
> > +
> > +- In order to eliminate write amplification during overwrite, F2FS only
> > +support compression on write-once file, data can be compressed only when
> > +all logical blocks in file are valid and cluster compress ratio is lower
> > +than specified threshold.
> > +
> > +- To enable compression on regular inode, there are three ways:
> > +* chattr +c file
> > +* chattr +c dir; touch dir/file
> > +* mount w/ -o compress_extension=ext; touch file.ext
> > +
> > +Compress metadata layout:
> > + [Dnode Structure]
> > + +-----------------------------------------------+
> > + | cluster 1 | cluster 2 | ......... | cluster N |
> > + +-----------------------------------------------+
> > + . . . .
> > + . . . .
> > + . Compressed Cluster . . Normal Cluster .
> > ++----------+---------+---------+---------+ +---------+---------+---------+---------+
> > +|compr flag| block 1 | block 2 | block 3 | | block 1 | block 2 | block 3 | block 4 |
> > ++----------+---------+---------+---------+ +---------+---------+---------+---------+
> > + . .
> > + . .
> > + . .
> > + +-------------+-------------+----------+----------------------------+
> > + | data length | data chksum | reserved | compressed data |
> > + +-------------+-------------+----------+----------------------------+
> > diff --git a/fs/f2fs/Kconfig b/fs/f2fs/Kconfig
> > index 652fd2e2b23d..6087a5577613 100644
> > --- a/fs/f2fs/Kconfig
> > +++ b/fs/f2fs/Kconfig
> > @@ -92,3 +92,26 @@ config F2FS_FAULT_INJECTION
> > Test F2FS to inject faults such as ENOMEM, ENOSPC, and so on.
> >
> > If unsure, say N.
> > +
> > +config F2FS_FS_COMPRESSION
> > + bool "F2FS compression feature"
> > + depends on F2FS_FS
> > + help
> > + Enable filesystem-level compression on f2fs regular files,
> > + multiple back-end compression algorithms are supported.
> > +
> > +config F2FS_FS_LZO
> > + bool "LZO compression support" if F2FS_FS_COMPRESSION
> > + select LZO_COMPRESS
> > + select LZO_DECOMPRESS
> > + default y
> > + help
> > + Support LZO compress algorithm, if unsure, say Y.
> > +
> > +config F2FS_FS_LZ4
> > + bool "LZ4 compression support" if F2FS_FS_COMPRESSION
> > + select LZ4_COMPRESS
> > + select LZ4_DECOMPRESS
> > + default y
> > + help
> > + Support LZ4 compress algorithm, if unsure, say Y.
> > diff --git a/fs/f2fs/Makefile b/fs/f2fs/Makefile
> > index 2aaecc63834f..ee7316b42f69 100644
> > --- a/fs/f2fs/Makefile
> > +++ b/fs/f2fs/Makefile
> > @@ -9,3 +9,4 @@ f2fs-$(CONFIG_F2FS_FS_XATTR) += xattr.o
> > f2fs-$(CONFIG_F2FS_FS_POSIX_ACL) += acl.o
> > f2fs-$(CONFIG_F2FS_IO_TRACE) += trace.o
> > f2fs-$(CONFIG_FS_VERITY) += verity.o
> > +f2fs-$(CONFIG_F2FS_FS_COMPRESSION) += compress.o
> > diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
> > new file mode 100644
> > index 000000000000..5e65aef72c46
> > --- /dev/null
> > +++ b/fs/f2fs/compress.c
> > @@ -0,0 +1,1098 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * f2fs compress support
> > + *
> > + * Copyright (c) 2019 Chao Yu <chao@...nel.org>
> > + */
> > +
> > +#include <linux/fs.h>
> > +#include <linux/f2fs_fs.h>
> > +#include <linux/writeback.h>
> > +#include <linux/lzo.h>
> > +#include <linux/lz4.h>
> > +
> > +#include "f2fs.h"
> > +#include "node.h"
> > +#include <trace/events/f2fs.h>
> > +
> > +struct f2fs_compress_ops {
> > + int (*init_compress_ctx)(struct compress_ctx *cc);
> > + void (*destroy_compress_ctx)(struct compress_ctx *cc);
> > + int (*compress_pages)(struct compress_ctx *cc);
> > + int (*decompress_pages)(struct decompress_io_ctx *dic);
> > +};
> > +
> > +static unsigned int offset_in_cluster(struct compress_ctx *cc, pgoff_t index)
> > +{
> > + return index & (cc->cluster_size - 1);
> > +}
> > +
> > +static unsigned int cluster_idx(struct compress_ctx *cc, pgoff_t index)
> > +{
> > + return index >> cc->log_cluster_size;
> > +}
> > +
> > +static unsigned int start_idx_of_cluster(struct compress_ctx *cc)
> > +{
> > + return cc->cluster_idx << cc->log_cluster_size;
> > +}
> > +
> > +bool f2fs_is_compressed_page(struct page *page)
> > +{
> > + if (!PagePrivate(page))
> > + return false;
> > + if (!page_private(page))
> > + return false;
> > + if (IS_ATOMIC_WRITTEN_PAGE(page) || IS_DUMMY_WRITTEN_PAGE(page))
> > + return false;
> > + f2fs_bug_on(F2FS_M_SB(page->i_mapping),
Fixed using page->mapping.
> > + *((u32 *)page_private(page)) == F2FS_COMPRESSED_PAGE_MAGIC);
> > + return true;
> > +}
> > +
> > +static void f2fs_set_compressed_page(struct page *page,
> > + struct inode *inode, pgoff_t index, void *data, refcount_t *r)
> > +{
> > + SetPagePrivate(page);
> > + set_page_private(page, (unsigned long)data);
> > +
> > + /* i_crypto_info and iv index */
> > + page->index = index;
> > + page->mapping = inode->i_mapping;
> > + if (r)
> > + refcount_inc(r);
> > +}
> > +
> > +static void f2fs_put_compressed_page(struct page *page)
> > +{
> > + set_page_private(page, (unsigned long)NULL);
> > + ClearPagePrivate(page);
> > + page->mapping = NULL;
> > + unlock_page(page);
> > + put_page(page);
> > +}
> > +
> > +struct page *f2fs_compress_control_page(struct page *page)
> > +{
> > + return ((struct compress_io_ctx *)page_private(page))->rpages[0];
> > +}
> > +
> > +int f2fs_init_compress_ctx(struct compress_ctx *cc)
> > +{
> > + struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
> > +
> > + if (cc->nr_rpages)
> > + return 0;
> > +
> > + cc->rpages = f2fs_kzalloc(sbi, sizeof(struct page *) <<
> > + cc->log_cluster_size, GFP_NOFS);
> > + if (!cc->rpages)
> > + return -ENOMEM;
> > + return 0;
> > +}
> > +
> > +void f2fs_destroy_compress_ctx(struct compress_ctx *cc)
> > +{
> > + f2fs_reset_compress_ctx(cc);
> > + kfree(cc->rpages);
> > +}
> > +
> > +void f2fs_compress_ctx_add_page(struct compress_ctx *cc, struct page *page)
> > +{
> > + unsigned int cluster_ofs;
> > +
> > + if (!f2fs_cluster_can_merge_page(cc, page->index))
> > + f2fs_bug_on(F2FS_I(cc->inode), 1);
Fixed using F2FS_I_SB(cc->inode).
Up-to-date patch is here.
https://github.com/jaegeuk/f2fs/commit/2c5f2b5d41ad5eb288aa281c8ff008882d0ae42b
I'm going to test a bit, so please post patches separately for a while, if
exists. :)
Thanks,
> > +
> > + cluster_ofs = offset_in_cluster(cc, page->index);
> > + cc->rpages[cluster_ofs] = page;
> > + cc->nr_rpages++;
> > + cc->cluster_idx = cluster_idx(cc, page->index);
> > +}
> > +
> > +#ifdef CONFIG_F2FS_FS_LZO
> > +static int lzo_init_compress_ctx(struct compress_ctx *cc)
> > +{
> > + cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
> > + LZO1X_MEM_COMPRESS, GFP_NOFS);
> > + if (!cc->private)
> > + return -ENOMEM;
> > +
> > + cc->clen = lzo1x_worst_compress(PAGE_SIZE << cc->log_cluster_size);
> > + return 0;
> > +}
> > +
> > +static void lzo_destroy_compress_ctx(struct compress_ctx *cc)
> > +{
> > + kvfree(cc->private);
> > + cc->private = NULL;
> > +}
> > +
> > +static int lzo_compress_pages(struct compress_ctx *cc)
> > +{
> > + int ret;
> > +
> > + ret = lzo1x_1_compress(cc->rbuf, cc->rlen, cc->cbuf->cdata,
> > + &cc->clen, cc->private);
> > + if (ret != LZO_E_OK) {
> > + printk_ratelimited("%sF2FS-fs (%s): lzo compress failed, ret:%d\n",
> > + KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id, ret);
> > + return -EIO;
> > + }
> > + return 0;
> > +}
> > +
> > +static int lzo_decompress_pages(struct decompress_io_ctx *dic)
> > +{
> > + int ret;
> > +
> > + ret = lzo1x_decompress_safe(dic->cbuf->cdata, dic->clen,
> > + dic->rbuf, &dic->rlen);
> > + if (ret != LZO_E_OK) {
> > + printk_ratelimited("%sF2FS-fs (%s): lzo decompress failed, ret:%d\n",
> > + KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
> > + return -EIO;
> > + }
> > +
> > + if (dic->rlen != PAGE_SIZE << dic->log_cluster_size) {
> > + printk_ratelimited("%sF2FS-fs (%s): lzo invalid rlen:%zu, "
> > + "expected:%lu\n", KERN_ERR,
> > + F2FS_I_SB(dic->inode)->sb->s_id,
> > + dic->rlen,
> > + PAGE_SIZE << dic->log_cluster_size);
> > + return -EIO;
> > + }
> > + return 0;
> > +}
> > +
> > +static const struct f2fs_compress_ops f2fs_lzo_ops = {
> > + .init_compress_ctx = lzo_init_compress_ctx,
> > + .destroy_compress_ctx = lzo_destroy_compress_ctx,
> > + .compress_pages = lzo_compress_pages,
> > + .decompress_pages = lzo_decompress_pages,
> > +};
> > +#endif
> > +
> > +#ifdef CONFIG_F2FS_FS_LZ4
> > +static int lz4_init_compress_ctx(struct compress_ctx *cc)
> > +{
> > + cc->private = f2fs_kvmalloc(F2FS_I_SB(cc->inode),
> > + LZ4_MEM_COMPRESS, GFP_NOFS);
> > + if (!cc->private)
> > + return -ENOMEM;
> > +
> > + cc->clen = LZ4_compressBound(PAGE_SIZE << cc->log_cluster_size);
> > + return 0;
> > +}
> > +
> > +static void lz4_destroy_compress_ctx(struct compress_ctx *cc)
> > +{
> > + kvfree(cc->private);
> > + cc->private = NULL;
> > +}
> > +
> > +static int lz4_compress_pages(struct compress_ctx *cc)
> > +{
> > + int len;
> > +
> > + len = LZ4_compress_default(cc->rbuf, cc->cbuf->cdata, cc->rlen,
> > + cc->clen, cc->private);
> > + if (!len) {
> > + printk_ratelimited("%sF2FS-fs (%s): lz4 compress failed\n",
> > + KERN_ERR, F2FS_I_SB(cc->inode)->sb->s_id);
> > + return -EIO;
> > + }
> > + cc->clen = len;
> > + return 0;
> > +}
> > +
> > +static int lz4_decompress_pages(struct decompress_io_ctx *dic)
> > +{
> > + int ret;
> > +
> > + ret = LZ4_decompress_safe(dic->cbuf->cdata, dic->rbuf,
> > + dic->clen, dic->rlen);
> > + if (ret < 0) {
> > + printk_ratelimited("%sF2FS-fs (%s): lz4 decompress failed, ret:%d\n",
> > + KERN_ERR, F2FS_I_SB(dic->inode)->sb->s_id, ret);
> > + return -EIO;
> > + }
> > +
> > + if (ret != PAGE_SIZE << dic->log_cluster_size) {
> > + printk_ratelimited("%sF2FS-fs (%s): lz4 invalid rlen:%zu, "
> > + "expected:%lu\n", KERN_ERR,
> > + F2FS_I_SB(dic->inode)->sb->s_id,
> > + dic->rlen,
> > + PAGE_SIZE << dic->log_cluster_size);
> > + return -EIO;
> > + }
> > + return 0;
> > +}
> > +
> > +static const struct f2fs_compress_ops f2fs_lz4_ops = {
> > + .init_compress_ctx = lz4_init_compress_ctx,
> > + .destroy_compress_ctx = lz4_destroy_compress_ctx,
> > + .compress_pages = lz4_compress_pages,
> > + .decompress_pages = lz4_decompress_pages,
> > +};
> > +#endif
> > +
> > +static const struct f2fs_compress_ops *f2fs_cops[COMPRESS_MAX] = {
> > +#ifdef CONFIG_F2FS_FS_LZO
> > + &f2fs_lzo_ops,
> > +#else
> > + NULL,
> > +#endif
> > +#ifdef CONFIG_F2FS_FS_LZ4
> > + &f2fs_lz4_ops,
> > +#else
> > + NULL,
> > +#endif
> > +};
> > +
> > +bool f2fs_is_compress_backend_ready(struct inode *inode)
> > +{
> > + if (!f2fs_compressed_file(inode))
> > + return true;
> > + return f2fs_cops[F2FS_I(inode)->i_compress_algorithm];
> > +}
> > +
> > +static struct page *f2fs_grab_page(void)
> > +{
> > + struct page *page;
> > +
> > + page = alloc_page(GFP_NOFS);
> > + if (!page)
> > + return NULL;
> > + lock_page(page);
> > + return page;
> > +}
> > +
> > +static int f2fs_compress_pages(struct compress_ctx *cc)
> > +{
> > + struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
> > + struct f2fs_inode_info *fi = F2FS_I(cc->inode);
> > + const struct f2fs_compress_ops *cops =
> > + f2fs_cops[fi->i_compress_algorithm];
> > + unsigned int max_len, nr_cpages;
> > + int i, ret;
> > +
> > + trace_f2fs_compress_pages_start(cc->inode, cc->cluster_idx,
> > + cc->cluster_size, fi->i_compress_algorithm);
> > +
> > + ret = cops->init_compress_ctx(cc);
> > + if (ret)
> > + goto out;
> > +
> > + max_len = COMPRESS_HEADER_SIZE + cc->clen;
> > + cc->nr_cpages = DIV_ROUND_UP(max_len, PAGE_SIZE);
> > +
> > + cc->cpages = f2fs_kzalloc(sbi, sizeof(struct page *) *
> > + cc->nr_cpages, GFP_NOFS);
> > + if (!cc->cpages) {
> > + ret = -ENOMEM;
> > + goto destroy_compress_ctx;
> > + }
> > +
> > + for (i = 0; i < cc->nr_cpages; i++) {
> > + cc->cpages[i] = f2fs_grab_page();
> > + if (!cc->cpages[i]) {
> > + ret = -ENOMEM;
> > + goto out_free_cpages;
> > + }
> > + }
> > +
> > + cc->rbuf = vmap(cc->rpages, cc->cluster_size, VM_MAP, PAGE_KERNEL_RO);
> > + if (!cc->rbuf) {
> > + ret = -ENOMEM;
> > + goto out_free_cpages;
> > + }
> > +
> > + cc->cbuf = vmap(cc->cpages, cc->nr_cpages, VM_MAP, PAGE_KERNEL);
> > + if (!cc->cbuf) {
> > + ret = -ENOMEM;
> > + goto out_vunmap_rbuf;
> > + }
> > +
> > + ret = cops->compress_pages(cc);
> > + if (ret)
> > + goto out_vunmap_cbuf;
> > +
> > + max_len = PAGE_SIZE * (cc->cluster_size - 1) - COMPRESS_HEADER_SIZE;
> > +
> > + if (cc->clen > max_len) {
> > + ret = -EAGAIN;
> > + goto out_vunmap_cbuf;
> > + }
> > +
> > + cc->cbuf->clen = cpu_to_le32(cc->clen);
> > + cc->cbuf->chksum = cpu_to_le32(0);
> > +
> > + for (i = 0; i < COMPRESS_DATA_RESERVED_SIZE; i++)
> > + cc->cbuf->reserved[i] = cpu_to_le32(0);
> > +
> > + vunmap(cc->cbuf);
> > + vunmap(cc->rbuf);
> > +
> > + nr_cpages = DIV_ROUND_UP(cc->clen + COMPRESS_HEADER_SIZE, PAGE_SIZE);
> > +
> > + for (i = nr_cpages; i < cc->nr_cpages; i++) {
> > + f2fs_put_compressed_page(cc->cpages[i]);
> > + cc->cpages[i] = NULL;
> > + }
> > +
> > + cc->nr_cpages = nr_cpages;
> > +
> > + trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
> > + cc->clen, ret);
> > + return 0;
> > +
> > +out_vunmap_cbuf:
> > + vunmap(cc->cbuf);
> > +out_vunmap_rbuf:
> > + vunmap(cc->rbuf);
> > +out_free_cpages:
> > + for (i = 0; i < cc->nr_cpages; i++) {
> > + if (cc->cpages[i])
> > + f2fs_put_compressed_page(cc->cpages[i]);
> > + }
> > + kfree(cc->cpages);
> > + cc->cpages = NULL;
> > +destroy_compress_ctx:
> > + cops->destroy_compress_ctx(cc);
> > +out:
> > + trace_f2fs_compress_pages_end(cc->inode, cc->cluster_idx,
> > + cc->clen, ret);
> > + return ret;
> > +}
> > +
> > +void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
> > +{
> > + struct decompress_io_ctx *dic =
> > + (struct decompress_io_ctx *)page_private(page);
> > + struct f2fs_sb_info *sbi = F2FS_I_SB(dic->inode);
> > + struct f2fs_inode_info *fi= F2FS_I(dic->inode);
> > + const struct f2fs_compress_ops *cops =
> > + f2fs_cops[fi->i_compress_algorithm];
> > + int ret;
> > +
> > + dec_page_count(sbi, F2FS_RD_DATA);
> > +
> > + if (bio->bi_status)
> > + dic->failed = true;
> > +
> > + if (refcount_dec_not_one(&dic->ref))
> > + return;
> > +
> > + trace_f2fs_decompress_pages_start(dic->inode, dic->cluster_idx,
> > + dic->cluster_size, fi->i_compress_algorithm);
> > +
> > + /* submit partial compressed pages */
> > + if (dic->failed) {
> > + ret = -EIO;
> > + goto out_free_dic;
> > + }
> > +
> > + dic->rbuf = vmap(dic->tpages, dic->cluster_size, VM_MAP, PAGE_KERNEL);
> > + if (!dic->rbuf) {
> > + ret = -ENOMEM;
> > + goto out_free_dic;
> > + }
> > +
> > + dic->cbuf = vmap(dic->cpages, dic->nr_cpages, VM_MAP, PAGE_KERNEL_RO);
> > + if (!dic->cbuf) {
> > + ret = -ENOMEM;
> > + goto out_vunmap_rbuf;
> > + }
> > +
> > + dic->clen = le32_to_cpu(dic->cbuf->clen);
> > + dic->rlen = PAGE_SIZE << dic->log_cluster_size;
> > +
> > + if (dic->clen > PAGE_SIZE * dic->nr_cpages - COMPRESS_HEADER_SIZE) {
> > + ret = -EFSCORRUPTED;
> > + goto out_vunmap_cbuf;
> > + }
> > +
> > + ret = cops->decompress_pages(dic);
> > +
> > +out_vunmap_cbuf:
> > + vunmap(dic->cbuf);
> > +out_vunmap_rbuf:
> > + vunmap(dic->rbuf);
> > +out_free_dic:
> > + f2fs_set_cluster_uptodate(dic->rpages, dic->cluster_size, ret, verity);
> > + trace_f2fs_decompress_pages_end(dic->inode, dic->cluster_idx,
> > + dic->clen, ret);
> > + f2fs_free_dic(dic);
> > +}
> > +
> > +static bool is_page_in_cluster(struct compress_ctx *cc, pgoff_t index)
> > +{
> > + if (cc->cluster_idx == NULL_CLUSTER)
> > + return true;
> > + return cc->cluster_idx == cluster_idx(cc, index);
> > +}
> > +
> > +bool f2fs_cluster_is_empty(struct compress_ctx *cc)
> > +{
> > + return cc->nr_rpages == 0;
> > +}
> > +
> > +static bool f2fs_cluster_is_full(struct compress_ctx *cc)
> > +{
> > + return cc->cluster_size == cc->nr_rpages;
> > +}
> > +
> > +bool f2fs_cluster_can_merge_page(struct compress_ctx *cc, pgoff_t index)
> > +{
> > + if (f2fs_cluster_is_empty(cc))
> > + return true;
> > + return is_page_in_cluster(cc, index);
> > +}
> > +
> > +static bool __cluster_may_compress(struct compress_ctx *cc)
> > +{
> > + struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
> > + loff_t i_size = i_size_read(cc->inode);
> > + unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
> > + int i;
> > +
> > + for (i = 0; i < cc->cluster_size; i++) {
> > + struct page *page = cc->rpages[i];
> > +
> > + f2fs_bug_on(sbi, !page);
> > +
> > + if (unlikely(f2fs_cp_error(sbi)))
> > + return false;
> > + if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
> > + return false;
> > +
> > + /* beyond EOF */
> > + if (page->index >= nr_pages)
> > + return false;
> > + if (page->index != start_idx_of_cluster(cc) + i)
> > + return false;
> > + }
> > + return true;
> > +}
> > +
> > +int is_compressed_cluster(struct compress_ctx *cc, pgoff_t index)
> > +{
> > + struct dnode_of_data dn;
> > + unsigned int start_idx = cluster_idx(cc, index) <<
> > + cc->log_cluster_size;
> > + int ret;
> > + int i;
> > +
> > + set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
> > + ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
> > + if (ret) {
> > + if (ret == -ENOENT)
> > + ret = 0;
> > + goto fail;
>
> Removed a space.
>
> > + }
> > +
> > + if (dn.data_blkaddr == COMPRESS_ADDR) {
> > + ret = CLUSTER_IS_FULL;
> > + for (i = 1; i < cc->cluster_size; i++) {
> > + block_t blkaddr;
> > +
> > + blkaddr = datablock_addr(dn.inode,
> > + dn.node_page, dn.ofs_in_node + i);
> > + if (blkaddr == NULL_ADDR) {
> > + ret = CLUSTER_HAS_SPACE;
> > + break;
> > + }
> > + }
> > + }
> > +fail:
> > + f2fs_put_dnode(&dn);
> > + return ret;
> > +}
> > +
> > +int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
> > +{
> > + struct compress_ctx cc = {
> > + .inode = inode,
> > + .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
> > + .cluster_size = F2FS_I(inode)->i_cluster_size,
> > + };
> > +
> > + return is_compressed_cluster(&cc, index);
> > +}
> > +
> > +static bool cluster_may_compress(struct compress_ctx *cc)
> > +{
> > + if (!f2fs_compressed_file(cc->inode))
> > + return false;
> > + if (f2fs_is_atomic_file(cc->inode))
> > + return false;
> > + if (f2fs_is_mmap_file(cc->inode))
> > + return false;
> > + if (!f2fs_cluster_is_full(cc))
> > + return false;
> > + return __cluster_may_compress(cc);
> > +}
> > +
> > +void f2fs_reset_compress_ctx(struct compress_ctx *cc)
> > +{
> > + cc->nr_rpages = 0;
> > + cc->nr_cpages = 0;
> > + cc->cluster_idx = NULL_CLUSTER;
> > +}
> > +
> > +static void set_cluster_writeback(struct compress_ctx *cc)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < cc->cluster_size; i++) {
> > + if (cc->rpages[i])
> > + set_page_writeback(cc->rpages[i]);
> > + }
> > +}
> > +
> > +static void set_cluster_dirty(struct compress_ctx *cc)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < cc->cluster_size; i++)
> > + if (cc->rpages[i])
> > + set_page_dirty(cc->rpages[i]);
> > +}
> > +
> > +static int prepare_compress_overwrite(struct compress_ctx *cc,
> > + struct page **pagep, pgoff_t index, void **fsdata,
> > + bool prealloc)
> > +{
> > + struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
> > + struct bio *bio = NULL;
> > + struct address_space *mapping = cc->inode->i_mapping;
> > + struct page *page;
> > + struct dnode_of_data dn;
> > + sector_t last_block_in_bio;
> > + unsigned fgp_flag = FGP_LOCK | FGP_WRITE | FGP_CREAT;
> > + unsigned int start_idx = cluster_idx(cc, index) << cc->log_cluster_size;
> > + int i, idx;
> > + int ret;
> > +
> > + ret = f2fs_init_compress_ctx(cc);
> > + if (ret)
> > + goto out;
> > +retry:
> > + /* keep page reference to avoid page reclaim */
> > + for (i = 0; i < cc->cluster_size; i++) {
> > + page = f2fs_pagecache_get_page(mapping, start_idx + i,
> > + fgp_flag, GFP_NOFS);
> > + if (!page) {
> > + ret = -ENOMEM;
> > + goto unlock_pages;
> > + }
> > +
> > + if (PageUptodate(page)) {
> > + unlock_page(page);
> > + continue;
> > + }
> > +
> > + f2fs_compress_ctx_add_page(cc, page);
> > + }
> > +
> > + if (!f2fs_cluster_is_empty(cc)) {
> > + ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
> > + &last_block_in_bio, false);
> > + if (ret)
> > + goto out;
> > +
> > + if (bio)
> > + f2fs_submit_bio(sbi, bio, DATA);
> > +
> > + ret = f2fs_init_compress_ctx(cc);
> > + if (ret)
> > + goto out;
> > + }
> > +
> > + for (i = 0; i < cc->cluster_size; i++) {
> > + page = find_lock_page(mapping, start_idx + i);
> > + f2fs_bug_on(sbi, !page);
> > +
> > + f2fs_wait_on_page_writeback(page, DATA, true, true);
> > +
> > + cc->rpages[i] = page;
> > + f2fs_put_page(page, 0);
> > +
> > + if (!PageUptodate(page)) {
> > + for (idx = i; idx >= 0; idx--) {
> > + f2fs_put_page(cc->rpages[idx], 0);
> > + f2fs_put_page(cc->rpages[idx], 1);
> > + }
> > + goto retry;
> > + }
> > + }
> > +
> > + if (prealloc) {
> > + __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true);
> > +
> > + set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
> > +
> > + for (i = cc->cluster_size - 1; i > 0; i--) {
> > + ret = f2fs_get_block(&dn, start_idx + i);
> > + if (ret)
> > + /* TODO: release preallocate blocks */
> > + goto release_pages;
> > +
> > + if (dn.data_blkaddr != NEW_ADDR)
> > + break;
> > + }
> > +
> > + __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false);
> > + }
> > +
> > + *fsdata = cc->rpages;
> > + *pagep = cc->rpages[offset_in_cluster(cc, index)];
> > + return CLUSTER_IS_FULL;
> > +
> > +unlock_pages:
> > + for (idx = 0; idx < i; idx++) {
> > + if (cc->rpages[idx])
> > + unlock_page(cc->rpages[idx]);
> > + }
> > +release_pages:
> > + for (idx = 0; idx < i; idx++) {
> > + page = find_lock_page(mapping, start_idx + idx);
> > + f2fs_put_page(page, 0);
> > + f2fs_put_page(page, 1);
> > + }
> > + f2fs_destroy_compress_ctx(cc);
> > +out:
> > + return ret;
> > +}
> > +
> > +int f2fs_prepare_compress_overwrite(struct inode *inode,
> > + struct page **pagep, pgoff_t index, void **fsdata)
> > +{
> > + struct compress_ctx cc = {
> > + .inode = inode,
> > + .cluster_size = F2FS_I(inode)->i_cluster_size,
> > + .cluster_idx = NULL_CLUSTER,
> > + .rpages = NULL,
> > + .nr_rpages = 0,
> > + };
> > + int ret = is_compressed_cluster(&cc, index);
> > +
> > + if (ret <= 0)
> > + return ret;
> > +
> > + /* compressed case */
> > + return prepare_compress_overwrite(&cc, pagep, index,
> > + fsdata, ret == CLUSTER_HAS_SPACE);
> > +}
> > +
> > +bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
> > + pgoff_t index, bool written)
> > +
> > +{
> > + struct compress_ctx cc = {
> > + .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
> > + .cluster_size = F2FS_I(inode)->i_cluster_size,
> > + .rpages = fsdata,
> > + };
> > + bool first_index = (index == cc.rpages[0]->index);
> > + int i;
> > +
> > + if (written)
> > + set_cluster_dirty(&cc);
> > +
> > + for (i = 0; i < cc.cluster_size; i++)
> > + f2fs_put_page(cc.rpages[i], 1);
> > +
> > + f2fs_destroy_compress_ctx(&cc);
> > +
> > + return first_index;
> > +
> > +}
> > +
> > +static int f2fs_write_compressed_pages(struct compress_ctx *cc,
> > + int *submitted,
> > + struct writeback_control *wbc,
> > + enum iostat_type io_type)
> > +{
> > + struct inode *inode = cc->inode;
> > + struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> > + struct f2fs_inode_info *fi = F2FS_I(inode);
> > + struct f2fs_io_info fio = {
> > + .sbi = sbi,
> > + .ino = cc->inode->i_ino,
> > + .type = DATA,
> > + .op = REQ_OP_WRITE,
> > + .op_flags = wbc_to_write_flags(wbc),
> > + .old_blkaddr = NEW_ADDR,
> > + .page = NULL,
> > + .encrypted_page = NULL,
> > + .compressed_page = NULL,
> > + .submitted = false,
> > + .need_lock = LOCK_RETRY,
> > + .io_type = io_type,
> > + .io_wbc = wbc,
> > + .compressed = true,
> > + .encrypted = f2fs_encrypted_file(cc->inode),
> > + };
> > + struct dnode_of_data dn;
> > + struct node_info ni;
> > + struct compress_io_ctx *cic;
> > + unsigned int start_idx = start_idx_of_cluster(cc);
> > + unsigned int last_index = cc->cluster_size - 1;
> > + loff_t psize;
> > + int pre_compressed_blocks = 0;
> > + int i, err;
> > +
> > + set_new_dnode(&dn, cc->inode, NULL, NULL, 0);
> > +
> > + f2fs_lock_op(sbi);
> > +
> > + err = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
> > + if (err)
> > + goto out_unlock_op;
> > +
> > + psize = (cc->rpages[last_index]->index + 1) << PAGE_SHIFT;
> > +
> > + err = f2fs_get_node_info(fio.sbi, dn.nid, &ni);
> > + if (err)
> > + goto out_put_dnode;
> > +
> > + fio.version = ni.version;
> > +
> > + cic = f2fs_kzalloc(sbi, sizeof(struct compress_io_ctx), GFP_NOFS);
> > + if (!cic)
> > + goto out_put_dnode;
> > +
> > + cic->magic = F2FS_COMPRESSED_PAGE_MAGIC;
> > + cic->inode = inode;
> > + refcount_set(&cic->ref, 1);
> > + cic->rpages = cc->rpages;
> > + cic->nr_rpages = cc->cluster_size;
> > +
> > + for (i = 0; i < cc->nr_cpages; i++) {
> > + f2fs_set_compressed_page(cc->cpages[i], inode,
> > + cc->rpages[i + 1]->index,
> > + cic, i ? &cic->ref : NULL);
> > + fio.compressed_page = cc->cpages[i];
> > + if (fio.encrypted) {
> > + fio.page = cc->rpages[i + 1];
> > + err = f2fs_encrypt_one_page(&fio);
> > + if (err)
> > + goto out_destroy_crypt;
> > + cc->cpages[i] = fio.encrypted_page;
> > + }
> > + }
> > +
> > + set_cluster_writeback(cc);
> > +
> > + for (i = 0; i < cc->cluster_size; i++, dn.ofs_in_node++) {
> > + block_t blkaddr;
> > +
> > + blkaddr = datablock_addr(dn.inode, dn.node_page,
> > + dn.ofs_in_node);
> > + fio.page = cc->rpages[i];
> > + fio.old_blkaddr = blkaddr;
> > +
> > + /* cluster header */
> > + if (i == 0) {
> > + if (blkaddr == COMPRESS_ADDR)
> > + pre_compressed_blocks++;
> > + if (__is_valid_data_blkaddr(blkaddr))
> > + f2fs_invalidate_blocks(sbi, blkaddr);
> > + f2fs_update_data_blkaddr(&dn, COMPRESS_ADDR);
> > + goto unlock_continue;
> > + }
> > +
> > + if (pre_compressed_blocks && __is_valid_data_blkaddr(blkaddr))
> > + pre_compressed_blocks++;
> > +
> > + if (i > cc->nr_cpages) {
> > + if (__is_valid_data_blkaddr(blkaddr)) {
> > + f2fs_invalidate_blocks(sbi, blkaddr);
> > + f2fs_update_data_blkaddr(&dn, NEW_ADDR);
> > + }
> > + goto unlock_continue;
> > + }
> > +
> > + f2fs_bug_on(fio.sbi, blkaddr == NULL_ADDR);
> > +
> > +
> > + if (fio.encrypted)
> > + fio.encrypted_page = cc->cpages[i - 1];
> > + else if (fio.compressed)
> > + fio.compressed_page = cc->cpages[i - 1];
> > + else
> > + f2fs_bug_on(sbi, 1);
> > + cc->cpages[i - 1] = NULL;
> > + f2fs_outplace_write_data(&dn, &fio);
> > + (*submitted)++;
> > +unlock_continue:
> > + inode_dec_dirty_pages(cc->inode);
> > + unlock_page(fio.page);
> > + }
> > +
> > + if (pre_compressed_blocks) {
> > + stat_sub_compr_blocks(inode,
> > + cc->cluster_size - pre_compressed_blocks + 1);
> > + F2FS_I(inode)->i_compressed_blocks -=
> > + (cc->cluster_size - pre_compressed_blocks + 1);
> > + }
> > + stat_add_compr_blocks(inode, cc->cluster_size - cc->nr_cpages);
> > + F2FS_I(inode)->i_compressed_blocks += cc->cluster_size - cc->nr_cpages;
> > + f2fs_mark_inode_dirty_sync(inode, true);
> > +
> > + set_inode_flag(cc->inode, FI_APPEND_WRITE);
> > + if (cc->cluster_idx == 0)
> > + set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
> > +
> > + f2fs_put_dnode(&dn);
> > + f2fs_unlock_op(sbi);
> > +
> > + if (err) {
> > + file_set_keep_isize(inode);
> > + } else {
> > + down_write(&fi->i_sem);
> > + if (fi->last_disk_size < psize)
> > + fi->last_disk_size = psize;
> > + up_write(&fi->i_sem);
> > + }
> > + return 0;
> > +
> > +out_destroy_crypt:
> > + for (i -= 1; i >= 0; i--)
> > + fscrypt_finalize_bounce_page(&cc->cpages[i]);
> > + for (i = 0; i < cc->nr_cpages; i++) {
> > + if (!cc->cpages[i])
> > + continue;
> > + f2fs_put_page(cc->cpages[i], 1);
> > + }
> > +out_put_dnode:
> > + f2fs_put_dnode(&dn);
> > +out_unlock_op:
> > + f2fs_unlock_op(sbi);
> > + return -EAGAIN;
> > +}
> > +
> > +void f2fs_compress_write_end_io(struct bio *bio, struct page *page)
> > +{
> > + struct f2fs_sb_info *sbi = bio->bi_private;
> > + struct compress_io_ctx *cic =
> > + (struct compress_io_ctx *)page_private(page);
> > + int i;
> > +
> > + if (unlikely(bio->bi_status))
> > + mapping_set_error(cic->inode->i_mapping, -EIO);
> > +
> > + f2fs_put_compressed_page(page);
> > +
> > + dec_page_count(sbi, F2FS_WB_DATA);
> > +
> > + if (refcount_dec_not_one(&cic->ref))
> > + return;
> > +
> > + for (i = 0; i < cic->nr_rpages; i++) {
> > + WARN_ON(!cic->rpages[i]);
> > + clear_cold_data(cic->rpages[i]);
> > + end_page_writeback(cic->rpages[i]);
> > + }
> > +
> > + kfree(cic->rpages);
> > + kfree(cic);
> > +}
> > +
> > +static int f2fs_write_raw_pages(struct compress_ctx *cc,
> > + int *submitted,
> > + struct writeback_control *wbc,
> > + enum iostat_type io_type)
> > +{
> > + int i, _submitted;
> > + int ret, err = 0;
> > +
> > + for (i = 0; i < cc->cluster_size; i++) {
> > + if (!cc->rpages[i])
> > + continue;
> > + BUG_ON(!PageLocked(cc->rpages[i]));
> > + ret = f2fs_write_single_data_page(cc->rpages[i], &_submitted,
> > + NULL, NULL, wbc, io_type);
> > + if (ret) {
> > + if (ret == AOP_WRITEPAGE_ACTIVATE)
> > + unlock_page(cc->rpages[i]);
> > + err = ret;
> > + goto out_fail;
> > + }
> > +
> > + *submitted += _submitted;
> > + }
> > + return 0;
> > +
> > +out_fail:
> > + /* TODO: revoke partially updated block addresses */
> > + for (++i; i < cc->cluster_size; i++) {
> > + if (!cc->rpages[i])
> > + continue;
> > + redirty_page_for_writepage(wbc, cc->rpages[i]);
> > + unlock_page(cc->rpages[i]);
> > + }
> > + return err;
> > +}
> > +
> > +int f2fs_write_multi_pages(struct compress_ctx *cc,
> > + int *submitted,
> > + struct writeback_control *wbc,
> > + enum iostat_type io_type)
> > +{
> > + struct f2fs_inode_info *fi = F2FS_I(cc->inode);
> > + const struct f2fs_compress_ops *cops =
> > + f2fs_cops[fi->i_compress_algorithm];
> > + int err = -EAGAIN;
> > +
> > + *submitted = 0;
> > +
> > + if (cluster_may_compress(cc)) {
> > + err = f2fs_compress_pages(cc);
> > + if (err) {
> > + err = -EAGAIN;
> > + goto write;
> > + }
> > + err = f2fs_write_compressed_pages(cc, submitted,
> > + wbc, io_type);
> > + cops->destroy_compress_ctx(cc);
> > + }
> > +write:
> > + if (err == -EAGAIN) {
> > + bool compressed = false;
> > +
> > + f2fs_bug_on(F2FS_I_SB(cc->inode), *submitted);
> > + if (is_compressed_cluster(cc, start_idx_of_cluster(cc)))
> > + compressed = true;
> > +
> > + err = f2fs_write_raw_pages(cc, submitted, wbc, io_type);
> > + if (compressed) {
> > + stat_sub_compr_blocks(cc->inode, *submitted);
> > + F2FS_I(cc->inode)->i_compressed_blocks -= *submitted;
> > + f2fs_mark_inode_dirty_sync(cc->inode, true);
> > + }
> > + }
> > +
> > + f2fs_reset_compress_ctx(cc);
> > + return err;
> > +}
> > +
> > +struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc)
> > +{
> > + struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
> > + struct decompress_io_ctx *dic;
> > + unsigned int start_idx = start_idx_of_cluster(cc);
> > + int i;
> > +
> > + dic = f2fs_kzalloc(sbi, sizeof(struct decompress_io_ctx), GFP_NOFS);
> > + if (!dic)
> > + goto out;
> > +
> > + dic->inode = cc->inode;
> > + refcount_set(&dic->ref, 1);
> > + dic->cluster_idx = cc->cluster_idx;
> > + dic->cluster_size = cc->cluster_size;
> > + dic->log_cluster_size = cc->log_cluster_size;
> > + dic->nr_cpages = cc->nr_cpages;
> > + dic->failed = false;
> > +
> > + dic->cpages = f2fs_kzalloc(sbi, sizeof(struct page *) *
> > + dic->nr_cpages, GFP_NOFS);
> > + if (!dic->cpages)
> > + goto out_free;
> > +
> > + for (i = 0; i < dic->nr_cpages; i++) {
> > + struct page *page;
> > +
> > + page = f2fs_grab_page();
> > + if (!page)
> > + goto out_free;
> > +
> > + f2fs_set_compressed_page(page, cc->inode,
> > + start_idx + i + 1,
> > + dic, i ? &dic->ref : NULL);
> > + dic->cpages[i] = page;
> > + }
> > +
> > + dic->tpages = f2fs_kzalloc(sbi, sizeof(struct page *) *
> > + dic->cluster_size, GFP_NOFS);
> > + if (!dic->tpages)
> > + goto out_free;
> > +
> > + for (i = 0; i < dic->cluster_size; i++) {
> > + if (cc->rpages[i])
> > + continue;
> > +
> > + dic->tpages[i] = f2fs_grab_page();
> > + if (!dic->tpages[i])
> > + goto out_free;
> > + }
> > +
> > + for (i = 0; i < dic->cluster_size; i++) {
> > + if (dic->tpages[i])
> > + continue;
> > + dic->tpages[i] = cc->rpages[i];
> > + }
> > +
> > + dic->rpages = cc->rpages;
> > + dic->nr_rpages = cc->cluster_size;
> > + return dic;
> > +
> > +out_free:
> > + f2fs_free_dic(dic);
> > +out:
> > + return ERR_PTR(-ENOMEM);
> > +}
> > +
> > +void f2fs_free_dic(struct decompress_io_ctx *dic)
> > +{
> > + int i;
> > +
> > + if (dic->tpages) {
> > + for (i = 0; i < dic->cluster_size; i++) {
> > + if (dic->rpages[i])
> > + continue;
> > + unlock_page(dic->tpages[i]);
> > + put_page(dic->tpages[i]);
> > + }
> > + kfree(dic->tpages);
> > + }
> > +
> > + if (dic->cpages) {
> > + for (i = 0; i < dic->nr_cpages; i++) {
> > + if (!dic->cpages[i])
> > + continue;
> > + f2fs_put_compressed_page(dic->cpages[i]);
> > + }
> > + kfree(dic->cpages);
> > + }
> > +
> > + kfree(dic->rpages);
> > + kfree(dic);
> > +}
> > +
> > +void f2fs_set_cluster_uptodate(struct page **rpages,
> > + unsigned int cluster_size, bool err, bool verity)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < cluster_size; i++) {
> > + struct page *rpage = rpages[i];
> > +
> > + if (!rpage)
> > + continue;
> > +
> > + if (err || PageError(rpage)) {
> > + ClearPageUptodate(rpage);
> > + ClearPageError(rpage);
> > + } else {
> > + if (!verity || fsverity_verify_page(rpage))
> > + SetPageUptodate(rpage);
> > + else
> > + SetPageError(rpage);
> > + }
> > + unlock_page(rpage);
> > + }
> > +}
> > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> > index 58f4bade6c2b..0bfd1b36141b 100644
> > --- a/fs/f2fs/data.c
> > +++ b/fs/f2fs/data.c
> > @@ -41,6 +41,9 @@ static bool __is_cp_guaranteed(struct page *page)
> > if (!mapping)
> > return false;
> >
> > + if (f2fs_is_compressed_page(page))
> > + return false;
> > +
> > inode = mapping->host;
> > sbi = F2FS_I_SB(inode);
> >
> > @@ -73,19 +76,19 @@ static enum count_type __read_io_type(struct page *page)
> >
> > /* postprocessing steps for read bios */
> > enum bio_post_read_step {
> > - STEP_INITIAL = 0,
> > STEP_DECRYPT,
> > + STEP_DECOMPRESS,
> > STEP_VERITY,
> > };
> >
> > struct bio_post_read_ctx {
> > struct bio *bio;
> > + struct f2fs_sb_info *sbi;
> > struct work_struct work;
> > - unsigned int cur_step;
> > unsigned int enabled_steps;
> > };
> >
> > -static void __read_end_io(struct bio *bio)
> > +static void __read_end_io(struct bio *bio, bool compr, bool verity)
> > {
> > struct page *page;
> > struct bio_vec *bv;
> > @@ -94,6 +97,13 @@ static void __read_end_io(struct bio *bio)
> > bio_for_each_segment_all(bv, bio, iter_all) {
> > page = bv->bv_page;
> >
> > +#ifdef CONFIG_F2FS_FS_COMPRESSION
> > + if (compr && PagePrivate(page)) {
> > + f2fs_decompress_pages(bio, page, verity);
> > + continue;
> > + }
> > +#endif
> > +
> > /* PG_error was set if any post_read step failed */
> > if (bio->bi_status || PageError(page)) {
> > ClearPageUptodate(page);
> > @@ -110,26 +120,52 @@ static void __read_end_io(struct bio *bio)
> > bio_put(bio);
> > }
> >
> > +static void f2fs_decompress_bio(struct bio *bio, bool verity)
> > +{
> > + __read_end_io(bio, true, verity);
> > +}
> > +
> > static void bio_post_read_processing(struct bio_post_read_ctx *ctx);
> >
> > -static void decrypt_work(struct work_struct *work)
> > +static void decrypt_work(struct bio_post_read_ctx *ctx)
> > {
> > - struct bio_post_read_ctx *ctx =
> > - container_of(work, struct bio_post_read_ctx, work);
> > -
> > fscrypt_decrypt_bio(ctx->bio);
> > +}
> > +
> > +static void decompress_work(struct bio_post_read_ctx *ctx, bool verity)
> > +{
> > + f2fs_decompress_bio(ctx->bio, verity);
> > +}
> >
> > - bio_post_read_processing(ctx);
> > +static void verity_work(struct bio_post_read_ctx *ctx)
> > +{
> > + fsverity_verify_bio(ctx->bio);
> > }
> >
> > -static void verity_work(struct work_struct *work)
> > +static void f2fs_post_read_work(struct work_struct *work)
> > {
> > struct bio_post_read_ctx *ctx =
> > container_of(work, struct bio_post_read_ctx, work);
> >
> > - fsverity_verify_bio(ctx->bio);
> > + if (ctx->enabled_steps & (1 << STEP_DECRYPT))
> > + decrypt_work(ctx);
> > +
> > + if (ctx->enabled_steps & (1 << STEP_DECOMPRESS)) {
> > + decompress_work(ctx,
> > + ctx->enabled_steps & (1 << STEP_VERITY));
> > + return;
> > + }
> > +
> > + if (ctx->enabled_steps & (1 << STEP_VERITY))
> > + verity_work(ctx);
> >
> > - bio_post_read_processing(ctx);
> > + __read_end_io(ctx->bio, false, false);
> > +}
> > +
> > +static void f2fs_enqueue_post_read_work(struct f2fs_sb_info *sbi,
> > + struct work_struct *work)
> > +{
> > + queue_work(sbi->post_read_wq, work);
> > }
> >
> > static void bio_post_read_processing(struct bio_post_read_ctx *ctx)
> > @@ -139,31 +175,18 @@ static void bio_post_read_processing(struct bio_post_read_ctx *ctx)
> > * verity may require reading metadata pages that need decryption, and
> > * we shouldn't recurse to the same workqueue.
> > */
> > - switch (++ctx->cur_step) {
> > - case STEP_DECRYPT:
> > - if (ctx->enabled_steps & (1 << STEP_DECRYPT)) {
> > - INIT_WORK(&ctx->work, decrypt_work);
> > - fscrypt_enqueue_decrypt_work(&ctx->work);
> > - return;
> > - }
> > - ctx->cur_step++;
> > - /* fall-through */
> > - case STEP_VERITY:
> > - if (ctx->enabled_steps & (1 << STEP_VERITY)) {
> > - INIT_WORK(&ctx->work, verity_work);
> > - fsverity_enqueue_verify_work(&ctx->work);
> > - return;
> > - }
> > - ctx->cur_step++;
> > - /* fall-through */
> > - default:
> > - __read_end_io(ctx->bio);
> > +
> > + if (ctx->enabled_steps) {
> > + INIT_WORK(&ctx->work, f2fs_post_read_work);
> > + f2fs_enqueue_post_read_work(ctx->sbi, &ctx->work);
> > + return;
> > }
> > + __read_end_io(ctx->bio, false, false);
> > }
> >
> > static bool f2fs_bio_post_read_required(struct bio *bio)
> > {
> > - return bio->bi_private && !bio->bi_status;
> > + return bio->bi_private;
> > }
> >
> > static void f2fs_read_end_io(struct bio *bio)
> > @@ -178,12 +201,11 @@ static void f2fs_read_end_io(struct bio *bio)
> > if (f2fs_bio_post_read_required(bio)) {
> > struct bio_post_read_ctx *ctx = bio->bi_private;
> >
> > - ctx->cur_step = STEP_INITIAL;
> > bio_post_read_processing(ctx);
> > return;
> > }
> >
> > - __read_end_io(bio);
> > + __read_end_io(bio, false, false);
> > }
> >
> > static void f2fs_write_end_io(struct bio *bio)
> > @@ -214,6 +236,13 @@ static void f2fs_write_end_io(struct bio *bio)
> >
> > fscrypt_finalize_bounce_page(&page);
> >
> > +#ifdef CONFIG_F2FS_FS_COMPRESSION
> > + if (f2fs_is_compressed_page(page)) {
> > + f2fs_compress_write_end_io(bio, page);
> > + continue;
> > + }
> > +#endif
> > +
> > if (unlikely(bio->bi_status)) {
> > mapping_set_error(page->mapping, -EIO);
> > if (type == F2FS_WB_CP_DATA)
> > @@ -358,6 +387,12 @@ static inline void __submit_bio(struct f2fs_sb_info *sbi,
> > submit_bio(bio);
> > }
> >
> > +void f2fs_submit_bio(struct f2fs_sb_info *sbi,
> > + struct bio *bio, enum page_type type)
> > +{
> > + __submit_bio(sbi, bio, type);
> > +}
> > +
> > static void __submit_merged_bio(struct f2fs_bio_info *io)
> > {
> > struct f2fs_io_info *fio = &io->fio;
> > @@ -380,7 +415,6 @@ static bool __has_merged_page(struct bio *bio, struct inode *inode,
> > struct page *page, nid_t ino)
> > {
> > struct bio_vec *bvec;
> > - struct page *target;
> > struct bvec_iter_all iter_all;
> >
> > if (!bio)
> > @@ -390,10 +424,12 @@ static bool __has_merged_page(struct bio *bio, struct inode *inode,
> > return true;
> >
> > bio_for_each_segment_all(bvec, bio, iter_all) {
> > + struct page *target = bvec->bv_page;
> >
> > - target = bvec->bv_page;
> > if (fscrypt_is_bounce_page(target))
> > target = fscrypt_pagecache_page(target);
> > + if (f2fs_is_compressed_page(target))
> > + target = f2fs_compress_control_page(target);
> >
> > if (inode && inode == target->mapping->host)
> > return true;
> > @@ -728,7 +764,12 @@ void f2fs_submit_page_write(struct f2fs_io_info *fio)
> >
> > verify_fio_blkaddr(fio);
> >
> > - bio_page = fio->encrypted_page ? fio->encrypted_page : fio->page;
> > + if (fio->encrypted_page)
> > + bio_page = fio->encrypted_page;
> > + else if (fio->compressed_page)
> > + bio_page = fio->compressed_page;
> > + else
> > + bio_page = fio->page;
> >
> > /* set submitted = true as a return value */
> > fio->submitted = true;
> > @@ -797,7 +838,8 @@ static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
> >
> > if (f2fs_encrypted_file(inode))
> > post_read_steps |= 1 << STEP_DECRYPT;
> > -
> > + if (f2fs_compressed_file(inode))
> > + post_read_steps |= 1 << STEP_DECOMPRESS;
> > if (f2fs_need_verity(inode, first_idx))
> > post_read_steps |= 1 << STEP_VERITY;
> >
> > @@ -808,6 +850,7 @@ static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
> > return ERR_PTR(-ENOMEM);
> > }
> > ctx->bio = bio;
> > + ctx->sbi = sbi;
> > ctx->enabled_steps = post_read_steps;
> > bio->bi_private = ctx;
> > }
> > @@ -1872,6 +1915,145 @@ static int f2fs_read_single_page(struct inode *inode, struct page *page,
> > return ret;
> > }
> >
> > +#ifdef CONFIG_F2FS_FS_COMPRESSION
> > +int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
> > + unsigned nr_pages, sector_t *last_block_in_bio,
> > + bool is_readahead)
> > +{
> > + struct dnode_of_data dn;
> > + struct inode *inode = cc->inode;
> > + struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> > + struct bio *bio = *bio_ret;
> > + unsigned int start_idx = cc->cluster_idx << cc->log_cluster_size;
> > + sector_t last_block_in_file;
> > + const unsigned blkbits = inode->i_blkbits;
> > + const unsigned blocksize = 1 << blkbits;
> > + struct decompress_io_ctx *dic = NULL;
> > + int i;
> > + int ret = 0;
> > +
> > + f2fs_bug_on(sbi, f2fs_cluster_is_empty(cc));
> > +
> > + last_block_in_file = (i_size_read(inode) + blocksize - 1) >> blkbits;
> > +
> > + /* get rid of pages beyond EOF */
> > + for (i = 0; i < cc->cluster_size; i++) {
> > + struct page *page = cc->rpages[i];
> > +
> > + if (!page)
> > + continue;
> > + if ((sector_t)page->index >= last_block_in_file) {
> > + zero_user_segment(page, 0, PAGE_SIZE);
> > + if (!PageUptodate(page))
> > + SetPageUptodate(page);
> > + } else if (!PageUptodate(page)) {
> > + continue;
> > + }
> > + unlock_page(page);
> > + cc->rpages[i] = NULL;
> > + cc->nr_rpages--;
> > + }
> > +
> > + /* we are done since all pages are beyond EOF */
> > + if (f2fs_cluster_is_empty(cc))
> > + goto out;
> > +
> > + set_new_dnode(&dn, inode, NULL, NULL, 0);
> > + ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
> > + if (ret)
> > + goto out;
> > +
> > + f2fs_bug_on(sbi, dn.data_blkaddr != COMPRESS_ADDR);
> > +
> > + for (i = 1; i < cc->cluster_size; i++) {
> > + block_t blkaddr;
> > +
> > + blkaddr = datablock_addr(dn.inode, dn.node_page,
> > + dn.ofs_in_node + i);
> > +
> > + if (!__is_valid_data_blkaddr(blkaddr))
> > + break;
> > +
> > + if (!f2fs_is_valid_blkaddr(sbi, blkaddr, DATA_GENERIC)) {
> > + ret = -EFAULT;
> > + goto out_put_dnode;
> > + }
> > + cc->nr_cpages++;
> > + }
> > +
> > + /* nothing to decompress */
> > + if (cc->nr_cpages == 0) {
> > + ret = 0;
> > + goto out_put_dnode;
> > + }
> > +
> > + dic = f2fs_alloc_dic(cc);
> > + if (IS_ERR(dic)) {
> > + ret = PTR_ERR(dic);
> > + goto out_put_dnode;
> > + }
> > +
> > + for (i = 0; i < dic->nr_cpages; i++) {
> > + struct page *page = dic->cpages[i];
> > + block_t blkaddr;
> > +
> > + blkaddr = datablock_addr(dn.inode, dn.node_page,
> > + dn.ofs_in_node + i + 1);
> > +
> > + if (bio && !page_is_mergeable(sbi, bio,
> > + *last_block_in_bio, blkaddr)) {
> > +submit_and_realloc:
> > + __submit_bio(sbi, bio, DATA);
> > + bio = NULL;
> > + }
> > +
> > + if (!bio) {
> > + bio = f2fs_grab_read_bio(inode, blkaddr, nr_pages,
> > + is_readahead ? REQ_RAHEAD : 0,
> > + page->index);
> > + if (IS_ERR(bio)) {
> > + ret = PTR_ERR(bio);
> > + bio = NULL;
> > + dic->failed = true;
> > + if (refcount_sub_and_test(dic->nr_cpages - i,
> > + &dic->ref))
> > + f2fs_set_cluster_uptodate(dic->rpages,
> > + cc->cluster_size, true,
> > + false);
> > + f2fs_free_dic(dic);
> > + f2fs_put_dnode(&dn);
> > + f2fs_reset_compress_ctx(cc);
> > + *bio_ret = bio;
> > + return ret;
> > + }
> > + }
> > +
> > + f2fs_wait_on_block_writeback(inode, blkaddr);
> > +
> > + if (bio_add_page(bio, page, blocksize, 0) < blocksize)
> > + goto submit_and_realloc;
> > +
> > + inc_page_count(sbi, F2FS_RD_DATA);
> > + ClearPageError(page);
> > + *last_block_in_bio = blkaddr;
> > + }
> > +
> > + f2fs_put_dnode(&dn);
> > +
> > + f2fs_reset_compress_ctx(cc);
> > + *bio_ret = bio;
> > + return 0;
> > +
> > +out_put_dnode:
> > + f2fs_put_dnode(&dn);
> > +out:
> > + f2fs_set_cluster_uptodate(cc->rpages, cc->cluster_size, true, false);
> > + f2fs_reset_compress_ctx(cc);
> > + *bio_ret = bio;
> > + return ret;
> > +}
> > +#endif
> > +
> > /*
> > * This function was originally taken from fs/mpage.c, and customized for f2fs.
> > * Major change was from block_size == page_size in f2fs by default.
> > @@ -1881,7 +2063,7 @@ static int f2fs_read_single_page(struct inode *inode, struct page *page,
> > * use ->readpage() or do the necessary surgery to decouple ->readpages()
> > * from read-ahead.
> > */
> > -static int f2fs_mpage_readpages(struct address_space *mapping,
> > +int f2fs_mpage_readpages(struct address_space *mapping,
> > struct list_head *pages, struct page *page,
> > unsigned nr_pages, bool is_readahead)
> > {
> > @@ -1889,6 +2071,19 @@ static int f2fs_mpage_readpages(struct address_space *mapping,
> > sector_t last_block_in_bio = 0;
> > struct inode *inode = mapping->host;
> > struct f2fs_map_blocks map;
> > +#ifdef CONFIG_F2FS_FS_COMPRESSION
> > + struct compress_ctx cc = {
> > + .inode = inode,
> > + .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
> > + .cluster_size = F2FS_I(inode)->i_cluster_size,
> > + .cluster_idx = NULL_CLUSTER,
> > + .rpages = NULL,
> > + .cpages = NULL,
> > + .nr_rpages = 0,
> > + .nr_cpages = 0,
> > + };
> > +#endif
> > + unsigned max_nr_pages = nr_pages;
> > int ret = 0;
> >
> > map.m_pblk = 0;
> > @@ -1912,9 +2107,40 @@ static int f2fs_mpage_readpages(struct address_space *mapping,
> > goto next_page;
> > }
> >
> > - ret = f2fs_read_single_page(inode, page, nr_pages, &map, &bio,
> > - &last_block_in_bio, is_readahead);
> > +#ifdef CONFIG_F2FS_FS_COMPRESSION
> > + if (f2fs_compressed_file(inode)) {
> > + /* there are remained comressed pages, submit them */
> > + if (!f2fs_cluster_can_merge_page(&cc, page->index)) {
> > + ret = f2fs_read_multi_pages(&cc, &bio,
> > + max_nr_pages,
> > + &last_block_in_bio,
> > + is_readahead);
> > + if (ret)
> > + goto set_error_page;
> > + }
> > + ret = f2fs_is_compressed_cluster(inode, page->index);
> > + if (ret < 0)
> > + goto set_error_page;
> > + else if (!ret)
> > + goto read_single_page;
> > +
> > + ret = f2fs_init_compress_ctx(&cc);
> > + if (ret)
> > + goto set_error_page;
> > +
> > + f2fs_compress_ctx_add_page(&cc, page);
> > +
> > + goto next_page;
> > + }
> > +read_single_page:
> > +#endif
> > +
> > + ret = f2fs_read_single_page(inode, page, max_nr_pages, &map,
> > + &bio, &last_block_in_bio, is_readahead);
> > if (ret) {
> > +#ifdef CONFIG_F2FS_FS_COMPRESSION
> > +set_error_page:
> > +#endif
> > SetPageError(page);
> > zero_user_segment(page, 0, PAGE_SIZE);
> > unlock_page(page);
> > @@ -1922,6 +2148,17 @@ static int f2fs_mpage_readpages(struct address_space *mapping,
> > next_page:
> > if (pages)
> > put_page(page);
> > +
> > +#ifdef CONFIG_F2FS_FS_COMPRESSION
> > + if (f2fs_compressed_file(inode)) {
> > + /* last page */
> > + if (nr_pages == 1 && !f2fs_cluster_is_empty(&cc))
> > + ret = f2fs_read_multi_pages(&cc, &bio,
> > + max_nr_pages,
> > + &last_block_in_bio,
> > + is_readahead);
> > + }
> > +#endif
> > }
> > BUG_ON(pages && !list_empty(pages));
> > if (bio)
> > @@ -1936,6 +2173,11 @@ static int f2fs_read_data_page(struct file *file, struct page *page)
> >
> > trace_f2fs_readpage(page, DATA);
> >
> > + if (!f2fs_is_compress_backend_ready(inode)) {
> > + unlock_page(page);
> > + return -EOPNOTSUPP;
> > + }
> > +
> > /* If the file has inline data, try to read it directly */
> > if (f2fs_has_inline_data(inode))
> > ret = f2fs_read_inline_data(inode, page);
> > @@ -1954,6 +2196,9 @@ static int f2fs_read_data_pages(struct file *file,
> >
> > trace_f2fs_readpages(inode, page, nr_pages);
> >
> > + if (!f2fs_is_compress_backend_ready(inode))
> > + return 0;
> > +
> > /* If the file has inline data, skip readpages */
> > if (f2fs_has_inline_data(inode))
> > return 0;
> > @@ -1961,22 +2206,23 @@ static int f2fs_read_data_pages(struct file *file,
> > return f2fs_mpage_readpages(mapping, pages, NULL, nr_pages, true);
> > }
> >
> > -static int encrypt_one_page(struct f2fs_io_info *fio)
> > +int f2fs_encrypt_one_page(struct f2fs_io_info *fio)
> > {
> > struct inode *inode = fio->page->mapping->host;
> > - struct page *mpage;
> > + struct page *mpage, *page;
> > gfp_t gfp_flags = GFP_NOFS;
> >
> > if (!f2fs_encrypted_file(inode))
> > return 0;
> >
> > + page = fio->compressed_page ? fio->compressed_page : fio->page;
> > +
> > /* wait for GCed page writeback via META_MAPPING */
> > f2fs_wait_on_block_writeback(inode, fio->old_blkaddr);
> >
> > retry_encrypt:
> > - fio->encrypted_page = fscrypt_encrypt_pagecache_blocks(fio->page,
> > - PAGE_SIZE, 0,
> > - gfp_flags);
> > + fio->encrypted_page = fscrypt_encrypt_pagecache_blocks(page,
> > + PAGE_SIZE, 0, gfp_flags);
> > if (IS_ERR(fio->encrypted_page)) {
> > /* flush pending IOs and wait for a while in the ENOMEM case */
> > if (PTR_ERR(fio->encrypted_page) == -ENOMEM) {
> > @@ -2136,7 +2382,7 @@ int f2fs_do_write_data_page(struct f2fs_io_info *fio)
> > if (ipu_force ||
> > (__is_valid_data_blkaddr(fio->old_blkaddr) &&
> > need_inplace_update(fio))) {
> > - err = encrypt_one_page(fio);
> > + err = f2fs_encrypt_one_page(fio);
> > if (err)
> > goto out_writepage;
> >
> > @@ -2172,7 +2418,7 @@ int f2fs_do_write_data_page(struct f2fs_io_info *fio)
> >
> > fio->version = ni.version;
> >
> > - err = encrypt_one_page(fio);
> > + err = f2fs_encrypt_one_page(fio);
> > if (err)
> > goto out_writepage;
> >
> > @@ -2193,7 +2439,7 @@ int f2fs_do_write_data_page(struct f2fs_io_info *fio)
> > return err;
> > }
> >
> > -static int __write_data_page(struct page *page, bool *submitted,
> > +int f2fs_write_single_data_page(struct page *page, int *submitted,
> > struct bio **bio,
> > sector_t *last_block,
> > struct writeback_control *wbc,
> > @@ -2202,7 +2448,7 @@ static int __write_data_page(struct page *page, bool *submitted,
> > struct inode *inode = page->mapping->host;
> > struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> > loff_t i_size = i_size_read(inode);
> > - const pgoff_t end_index = ((unsigned long long) i_size)
> > + const pgoff_t end_index = ((unsigned long long)i_size)
> > >> PAGE_SHIFT;
> > loff_t psize = (page->index + 1) << PAGE_SHIFT;
> > unsigned nr_pages = DIV_ROUND_UP(i_size, PAGE_SIZE);
> > @@ -2243,7 +2489,8 @@ static int __write_data_page(struct page *page, bool *submitted,
> > if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
> > goto redirty_out;
> >
> > - if (page->index < end_index || f2fs_verity_in_progress(inode))
> > + if (f2fs_compressed_file(inode) ||
> > + page->index < end_index || f2fs_verity_in_progress(inode))
> > goto write;
> >
> > /*
> > @@ -2318,7 +2565,6 @@ static int __write_data_page(struct page *page, bool *submitted,
> > f2fs_remove_dirty_inode(inode);
> > submitted = NULL;
> > }
> > -
> > unlock_page(page);
> > if (!S_ISDIR(inode->i_mode) && !IS_NOQUOTA(inode) &&
> > !F2FS_I(inode)->cp_task)
> > @@ -2331,7 +2577,7 @@ static int __write_data_page(struct page *page, bool *submitted,
> > }
> >
> > if (submitted)
> > - *submitted = fio.submitted;
> > + *submitted = fio.submitted ? 1 : 0;
> >
> > return 0;
> >
> > @@ -2352,7 +2598,19 @@ static int __write_data_page(struct page *page, bool *submitted,
> > static int f2fs_write_data_page(struct page *page,
> > struct writeback_control *wbc)
> > {
> > - return __write_data_page(page, NULL, NULL, NULL, wbc, FS_DATA_IO);
> > +#ifdef CONFIG_F2FS_FS_COMPRESSION
> > + struct inode *inode = page->mapping->host;
> > +
> > + if (f2fs_compressed_file(inode)) {
> > + if (f2fs_is_compressed_cluster(inode, page->index)) {
> > + redirty_page_for_writepage(wbc, page);
> > + return AOP_WRITEPAGE_ACTIVATE;
> > + }
> > + }
> > +#endif
> > +
> > + return f2fs_write_single_data_page(page, NULL, NULL, NULL,
> > + wbc, FS_DATA_IO);
> > }
> >
> > /*
> > @@ -2365,11 +2623,27 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
> > enum iostat_type io_type)
> > {
> > int ret = 0;
> > - int done = 0;
> > + int done = 0, retry = 0;
> > struct pagevec pvec;
> > struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
> > struct bio *bio = NULL;
> > sector_t last_block;
> > +#ifdef CONFIG_F2FS_FS_COMPRESSION
> > + struct inode *inode = mapping->host;
> > + struct compress_ctx cc = {
> > + .inode = inode,
> > + .log_cluster_size = F2FS_I(inode)->i_log_cluster_size,
> > + .cluster_size = F2FS_I(inode)->i_cluster_size,
> > + .cluster_idx = NULL_CLUSTER,
> > + .rpages = NULL,
> > + .nr_rpages = 0,
> > + .cpages = NULL,
> > + .rbuf = NULL,
> > + .cbuf = NULL,
> > + .rlen = PAGE_SIZE * F2FS_I(inode)->i_cluster_size,
> > + .private = NULL,
> > + };
> > +#endif
> > int nr_pages;
> > pgoff_t uninitialized_var(writeback_index);
> > pgoff_t index;
> > @@ -2379,6 +2653,8 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
> > int range_whole = 0;
> > xa_mark_t tag;
> > int nwritten = 0;
> > + int submitted = 0;
> > + int i;
> >
> > pagevec_init(&pvec);
> >
> > @@ -2408,12 +2684,11 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
> > else
> > tag = PAGECACHE_TAG_DIRTY;
> > retry:
> > + retry = 0;
> > if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
> > tag_pages_for_writeback(mapping, index, end);
> > done_index = index;
> > - while (!done && (index <= end)) {
> > - int i;
> > -
> > + while (!done && !retry && (index <= end)) {
> > nr_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, end,
> > tag);
> > if (nr_pages == 0)
> > @@ -2421,7 +2696,51 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
> >
> > for (i = 0; i < nr_pages; i++) {
> > struct page *page = pvec.pages[i];
> > - bool submitted = false;
> > + bool need_readd = false;
> > +
> > +readd:
> > +#ifdef CONFIG_F2FS_FS_COMPRESSION
> > + need_readd = false;
> > +
> > + if (f2fs_compressed_file(inode)) {
> > + void *fsdata = NULL;
> > + struct page *pagep;
> > + int ret2;
> > +
> > + ret = f2fs_init_compress_ctx(&cc);
> > + if (ret) {
> > + done = 1;
> > + break;
> > + }
> > +
> > + if (!f2fs_cluster_can_merge_page(&cc,
> > + page->index)) {
> > +
> > + ret = f2fs_write_multi_pages(&cc,
> > + &submitted, wbc, io_type);
> > + if (!ret)
> > + need_readd = true;
> > + goto result;
> > + }
> > +
> > + if (f2fs_cluster_is_empty(&cc)) {
> > + ret2 = f2fs_prepare_compress_overwrite(
> > + inode, &pagep,
> > + page->index, &fsdata);
> > + if (ret2 < 0) {
> > + ret = ret2;
> > + done = 1;
> > + break;
> > + } else if (ret2 &&
> > + !f2fs_compress_write_end(inode,
> > + fsdata, page->index,
> > + true)) {
> > + retry = 1;
> > + break;
> > + }
> > + }
> > + }
> > +#endif
> >
> > /* give a priority to WB_SYNC threads */
> > if (atomic_read(&sbi->wb_sync_req[DATA]) &&
> > @@ -2431,7 +2750,7 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
> > }
> >
> > done_index = page->index;
> > -retry_write:
> > +
> > lock_page(page);
> >
> > if (unlikely(page->mapping != mapping)) {
> > @@ -2456,45 +2775,64 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
> > if (!clear_page_dirty_for_io(page))
> > goto continue_unlock;
> >
> > - ret = __write_data_page(page, &submitted, &bio,
> > - &last_block, wbc, io_type);
> > +#ifdef CONFIG_F2FS_FS_COMPRESSION
> > + if (f2fs_compressed_file(inode)) {
> > + f2fs_compress_ctx_add_page(&cc, page);
> > + continue;
> > + }
> > +#endif
> > + ret = f2fs_write_single_data_page(page, &submitted,
> > + &bio, &last_block, wbc, io_type);
> > + if (ret == AOP_WRITEPAGE_ACTIVATE)
> > + unlock_page(page);
> > +#ifdef CONFIG_F2FS_FS_COMPRESSION
> > +result:
> > +#endif
> > + nwritten += submitted;
> > + wbc->nr_to_write -= submitted;
> > +
> > if (unlikely(ret)) {
> > /*
> > * keep nr_to_write, since vfs uses this to
> > * get # of written pages.
> > */
> > if (ret == AOP_WRITEPAGE_ACTIVATE) {
> > - unlock_page(page);
> > ret = 0;
> > - continue;
> > + goto next;
> > } else if (ret == -EAGAIN) {
> > ret = 0;
> > - if (wbc->sync_mode == WB_SYNC_ALL) {
> > - cond_resched();
> > - congestion_wait(BLK_RW_ASYNC,
> > - HZ/50);
> > - goto retry_write;
> > - }
> > - continue;
> > + goto next;
> > }
> > done_index = page->index + 1;
> > done = 1;
> > break;
> > - } else if (submitted) {
> > - nwritten++;
> > }
> >
> > - if (--wbc->nr_to_write <= 0 &&
> > + if (wbc->nr_to_write <= 0 &&
> > wbc->sync_mode == WB_SYNC_NONE) {
> > done = 1;
> > break;
> > }
> > +next:
> > + if (need_readd)
> > + goto readd;
> > }
> > +
> > pagevec_release(&pvec);
> > cond_resched();
> > }
> >
> > - if (!cycled && !done) {
> > +#ifdef CONFIG_F2FS_FS_COMPRESSION
> > + /* flush remained pages in compress cluster */
> > + if (f2fs_compressed_file(inode) && !f2fs_cluster_is_empty(&cc)) {
> > + ret = f2fs_write_multi_pages(&cc, &submitted, wbc, io_type);
> > + nwritten += submitted;
> > + wbc->nr_to_write -= submitted;
> > + /* TODO: error handling */
> > + }
> > +#endif
> > +
> > + if ((!cycled && !done) || retry) {
> > cycled = 1;
> > index = 0;
> > end = writeback_index - 1;
> > @@ -2518,6 +2856,8 @@ static inline bool __should_serialize_io(struct inode *inode,
> > {
> > if (!S_ISREG(inode->i_mode))
> > return false;
> > + if (f2fs_compressed_file(inode))
> > + return true;
> > if (IS_NOQUOTA(inode))
> > return false;
> > /* to avoid deadlock in path of data flush */
> > @@ -2660,6 +3000,7 @@ static int prepare_write_begin(struct f2fs_sb_info *sbi,
> > __do_map_lock(sbi, flag, true);
> > locked = true;
> > }
> > +
> > restart:
> > /* check inline_data */
> > ipage = f2fs_get_node_page(sbi, inode->i_ino);
> > @@ -2750,6 +3091,24 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping,
> > if (err)
> > goto fail;
> > }
> > +
> > +#ifdef CONFIG_F2FS_FS_COMPRESSION
> > + if (f2fs_compressed_file(inode)) {
> > + int ret;
> > +
> > + *fsdata = NULL;
> > +
> > + ret = f2fs_prepare_compress_overwrite(inode, pagep,
> > + index, fsdata);
> > + if (ret < 0) {
> > + err = ret;
> > + goto fail;
> > + } else if (ret) {
> > + return 0;
> > + }
> > + }
> > +#endif
> > +
> > repeat:
> > /*
> > * Do not use grab_cache_page_write_begin() to avoid deadlock due to
> > @@ -2762,6 +3121,8 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping,
> > goto fail;
> > }
> >
> > + /* TODO: cluster can be compressed due to race with .writepage */
> > +
> > *pagep = page;
> >
> > err = prepare_write_begin(sbi, page, pos, len,
> > @@ -2845,6 +3206,16 @@ static int f2fs_write_end(struct file *file,
> > else
> > SetPageUptodate(page);
> > }
> > +
> > +#ifdef CONFIG_F2FS_FS_COMPRESSION
> > + /* overwrite compressed file */
> > + if (f2fs_compressed_file(inode) && fsdata) {
> > + f2fs_compress_write_end(inode, fsdata, page->index, copied);
> > + f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
> > + return copied;
> > + }
> > +#endif
> > +
> > if (!copied)
> > goto unlock_out;
> >
> > @@ -3235,6 +3606,15 @@ static int f2fs_swap_activate(struct swap_info_struct *sis, struct file *file,
> > if (ret)
> > return ret;
> >
> > + if (f2fs_compressed_file(inode)) {
> > + if (F2FS_I(inode)->i_compressed_blocks)
> > + return -EINVAL;
> > +
> > + F2FS_I(inode)->i_flags &= ~FS_COMPR_FL;
> > + clear_inode_flag(inode, FI_COMPRESSED_FILE);
> > + stat_dec_compr_inode(inode);
> > + }
> > +
> > ret = check_swap_activate(file, sis->max);
> > if (ret)
> > return ret;
> > @@ -3319,6 +3699,27 @@ void f2fs_destroy_post_read_processing(void)
> > kmem_cache_destroy(bio_post_read_ctx_cache);
> > }
> >
> > +int f2fs_init_post_read_wq(struct f2fs_sb_info *sbi)
> > +{
> > + if (!f2fs_sb_has_encrypt(sbi) &&
> > + !f2fs_sb_has_verity(sbi) &&
> > + !f2fs_sb_has_compression(sbi))
> > + return 0;
> > +
> > + sbi->post_read_wq = alloc_workqueue("f2fs_post_read_wq",
> > + WQ_UNBOUND | WQ_HIGHPRI,
> > + num_online_cpus());
> > + if (!sbi->post_read_wq)
> > + return -ENOMEM;
> > + return 0;
> > +}
> > +
> > +void f2fs_destroy_post_read_wq(struct f2fs_sb_info *sbi)
> > +{
> > + if (sbi->post_read_wq)
> > + destroy_workqueue(sbi->post_read_wq);
> > +}
> > +
> > int __init f2fs_init_bio_entry_cache(void)
> > {
> > bio_entry_slab = f2fs_kmem_cache_create("bio_entry_slab",
> > diff --git a/fs/f2fs/debug.c b/fs/f2fs/debug.c
> > index 5abd1d67d8b2..4f3ef1a892f0 100644
> > --- a/fs/f2fs/debug.c
> > +++ b/fs/f2fs/debug.c
> > @@ -94,6 +94,8 @@ static void update_general_status(struct f2fs_sb_info *sbi)
> > si->inline_xattr = atomic_read(&sbi->inline_xattr);
> > si->inline_inode = atomic_read(&sbi->inline_inode);
> > si->inline_dir = atomic_read(&sbi->inline_dir);
> > + si->compr_inode = atomic_read(&sbi->compr_inode);
> > + si->compr_blocks = atomic_read(&sbi->compr_blocks);
> > si->append = sbi->im[APPEND_INO].ino_num;
> > si->update = sbi->im[UPDATE_INO].ino_num;
> > si->orphans = sbi->im[ORPHAN_INO].ino_num;
> > @@ -315,6 +317,8 @@ static int stat_show(struct seq_file *s, void *v)
> > si->inline_inode);
> > seq_printf(s, " - Inline_dentry Inode: %u\n",
> > si->inline_dir);
> > + seq_printf(s, " - Compressed Inode: %u, Blocks: %u\n",
> > + si->compr_inode, si->compr_blocks);
> > seq_printf(s, " - Orphan/Append/Update Inode: %u, %u, %u\n",
> > si->orphans, si->append, si->update);
> > seq_printf(s, "\nMain area: %d segs, %d secs %d zones\n",
> > @@ -491,6 +495,8 @@ int f2fs_build_stats(struct f2fs_sb_info *sbi)
> > atomic_set(&sbi->inline_xattr, 0);
> > atomic_set(&sbi->inline_inode, 0);
> > atomic_set(&sbi->inline_dir, 0);
> > + atomic_set(&sbi->compr_inode, 0);
> > + atomic_set(&sbi->compr_blocks, 0);
> > atomic_set(&sbi->inplace_count, 0);
> > for (i = META_CP; i < META_MAX; i++)
> > atomic_set(&sbi->meta_count[i], 0);
> > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > index 8833e9d32f9d..74250d9f5cef 100644
> > --- a/fs/f2fs/f2fs.h
> > +++ b/fs/f2fs/f2fs.h
> > @@ -116,6 +116,8 @@ typedef u32 block_t; /*
> > */
> > typedef u32 nid_t;
> >
> > +#define COMPRESS_EXT_NUM 16
> > +
> > struct f2fs_mount_info {
> > unsigned int opt;
> > int write_io_size_bits; /* Write IO size bits */
> > @@ -140,6 +142,12 @@ struct f2fs_mount_info {
> > block_t unusable_cap; /* Amount of space allowed to be
> > * unusable when disabling checkpoint
> > */
> > +
> > + /* For compression */
> > + unsigned char compress_algorithm; /* algorithm type */
> > + unsigned compress_log_size; /* cluster log size */
> > + unsigned char compress_ext_cnt; /* extension count */
> > + unsigned char extensions[COMPRESS_EXT_NUM][F2FS_EXTENSION_LEN]; /* extensions */
> > };
> >
> > #define F2FS_FEATURE_ENCRYPT 0x0001
> > @@ -155,6 +163,7 @@ struct f2fs_mount_info {
> > #define F2FS_FEATURE_VERITY 0x0400
> > #define F2FS_FEATURE_SB_CHKSUM 0x0800
> > #define F2FS_FEATURE_CASEFOLD 0x1000
> > +#define F2FS_FEATURE_COMPRESSION 0x2000
> >
> > #define __F2FS_HAS_FEATURE(raw_super, mask) \
> > ((raw_super->feature & cpu_to_le32(mask)) != 0)
> > @@ -712,6 +721,12 @@ struct f2fs_inode_info {
> > int i_inline_xattr_size; /* inline xattr size */
> > struct timespec64 i_crtime; /* inode creation time */
> > struct timespec64 i_disk_time[4];/* inode disk times */
> > +
> > + /* for file compress */
> > + u64 i_compressed_blocks; /* # of compressed blocks */
> > + unsigned char i_compress_algorithm; /* algorithm type */
> > + unsigned char i_log_cluster_size; /* log of cluster size */
> > + unsigned int i_cluster_size; /* cluster size */
> > };
> >
> > static inline void get_extent_info(struct extent_info *ext,
> > @@ -1056,12 +1071,15 @@ struct f2fs_io_info {
> > block_t old_blkaddr; /* old block address before Cow */
> > struct page *page; /* page to be written */
> > struct page *encrypted_page; /* encrypted page */
> > + struct page *compressed_page; /* compressed page */
> > struct list_head list; /* serialize IOs */
> > bool submitted; /* indicate IO submission */
> > int need_lock; /* indicate we need to lock cp_rwsem */
> > bool in_list; /* indicate fio is in io_list */
> > bool is_por; /* indicate IO is from recovery or not */
> > bool retry; /* need to reallocate block address */
> > + bool compressed; /* indicate cluster is compressed */
> > + bool encrypted; /* indicate file is encrypted */
> > enum iostat_type io_type; /* io type */
> > struct writeback_control *io_wbc; /* writeback control */
> > struct bio **bio; /* bio for ipu */
> > @@ -1169,6 +1187,18 @@ enum fsync_mode {
> > FSYNC_MODE_NOBARRIER, /* fsync behaves nobarrier based on posix */
> > };
> >
> > +/*
> > + * this value is set in page as a private data which indicate that
> > + * the page is atomically written, and it is in inmem_pages list.
> > + */
> > +#define ATOMIC_WRITTEN_PAGE ((unsigned long)-1)
> > +#define DUMMY_WRITTEN_PAGE ((unsigned long)-2)
> > +
> > +#define IS_ATOMIC_WRITTEN_PAGE(page) \
> > + (page_private(page) == (unsigned long)ATOMIC_WRITTEN_PAGE)
> > +#define IS_DUMMY_WRITTEN_PAGE(page) \
> > + (page_private(page) == (unsigned long)DUMMY_WRITTEN_PAGE)
> > +
> > #ifdef CONFIG_FS_ENCRYPTION
> > #define DUMMY_ENCRYPTION_ENABLED(sbi) \
> > (unlikely(F2FS_OPTION(sbi).test_dummy_encryption))
> > @@ -1176,6 +1206,74 @@ enum fsync_mode {
> > #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
> > #endif
> >
> > +/* For compression */
> > +enum compress_algorithm_type {
> > + COMPRESS_LZO,
> > + COMPRESS_LZ4,
> > + COMPRESS_MAX,
> > +};
> > +
> > +#define COMPRESS_DATA_RESERVED_SIZE 4
> > +struct compress_data {
> > + __le32 clen; /* compressed data size */
> > + __le32 chksum; /* checksum of compressed data */
> > + __le32 reserved[COMPRESS_DATA_RESERVED_SIZE]; /* reserved */
> > + u8 cdata[]; /* compressed data */
> > +};
> > +
> > +#define COMPRESS_HEADER_SIZE (sizeof(struct compress_data))
> > +
> > +#define F2FS_COMPRESSED_PAGE_MAGIC 0xF5F2C000
> > +
> > +/* compress context */
> > +struct compress_ctx {
> > + struct inode *inode; /* inode the context belong to */
> > + unsigned int cluster_idx; /* cluster index number */
> > + unsigned int cluster_size; /* page count in cluster */
> > + unsigned int log_cluster_size; /* log of cluster size */
> > + struct page **rpages; /* pages store raw data in cluster */
> > + unsigned int nr_rpages; /* total page number in rpages */
> > + struct page **cpages; /* pages store compressed data in cluster */
> > + unsigned int nr_cpages; /* total page number in cpages */
> > + void *rbuf; /* virtual mapped address on rpages */
> > + struct compress_data *cbuf; /* virtual mapped address on cpages */
> > + size_t rlen; /* valid data length in rbuf */
> > + size_t clen; /* valid data length in cbuf */
> > + void *private; /* payload buffer for specified compression algorithm */
> > +};
> > +
> > +/* compress context for write IO path */
> > +struct compress_io_ctx {
> > + struct inode *inode; /* inode the context belong to */
> > + struct page **rpages; /* pages store raw data in cluster */
> > + unsigned int nr_rpages; /* total page number in rpages */
> > + refcount_t ref; /* referrence count of raw page */
> > + u32 magic; /* magic number to indicate page is compressed */
> > +};
> > +
> > +/* decompress io context for read IO path */
> > +struct decompress_io_ctx {
> > + struct inode *inode; /* inode the context belong to */
> > + unsigned int cluster_idx; /* cluster index number */
> > + unsigned int cluster_size; /* page count in cluster */
> > + unsigned int log_cluster_size; /* log of cluster size */
> > + struct page **rpages; /* pages store raw data in cluster */
> > + unsigned int nr_rpages; /* total page number in rpages */
> > + struct page **cpages; /* pages store compressed data in cluster */
> > + unsigned int nr_cpages; /* total page number in cpages */
> > + struct page **tpages; /* temp pages to pad holes in cluster */
> > + void *rbuf; /* virtual mapped address on rpages */
> > + struct compress_data *cbuf; /* virtual mapped address on cpages */
> > + size_t rlen; /* valid data length in rbuf */
> > + size_t clen; /* valid data length in cbuf */
> > + refcount_t ref; /* referrence count of compressed page */
> > + bool failed; /* indicate IO error during decompression */
> > +};
> > +
> > +#define NULL_CLUSTER ((unsigned int)(~0))
> > +#define MIN_COMPRESS_LOG_SIZE 2
> > +#define MAX_COMPRESS_LOG_SIZE 8
> > +
> > struct f2fs_sb_info {
> > struct super_block *sb; /* pointer to VFS super block */
> > struct proc_dir_entry *s_proc; /* proc entry */
> > @@ -1326,6 +1424,8 @@ struct f2fs_sb_info {
> > atomic_t inline_xattr; /* # of inline_xattr inodes */
> > atomic_t inline_inode; /* # of inline_data inodes */
> > atomic_t inline_dir; /* # of inline_dentry inodes */
> > + atomic_t compr_inode; /* # of compressed inodes */
> > + atomic_t compr_blocks; /* # of compressed blocks */
> > atomic_t aw_cnt; /* # of atomic writes */
> > atomic_t vw_cnt; /* # of volatile writes */
> > atomic_t max_aw_cnt; /* max # of atomic writes */
> > @@ -1364,6 +1464,8 @@ struct f2fs_sb_info {
> >
> > /* Precomputed FS UUID checksum for seeding other checksums */
> > __u32 s_chksum_seed;
> > +
> > + struct workqueue_struct *post_read_wq; /* post read workqueue */
> > };
> >
> > struct f2fs_private_dio {
> > @@ -2377,11 +2479,13 @@ static inline void f2fs_change_bit(unsigned int nr, char *addr)
> > /*
> > * On-disk inode flags (f2fs_inode::i_flags)
> > */
> > +#define F2FS_COMPR_FL 0x00000004 /* Compress file */
> > #define F2FS_SYNC_FL 0x00000008 /* Synchronous updates */
> > #define F2FS_IMMUTABLE_FL 0x00000010 /* Immutable file */
> > #define F2FS_APPEND_FL 0x00000020 /* writes to file may only append */
> > #define F2FS_NODUMP_FL 0x00000040 /* do not dump file */
> > #define F2FS_NOATIME_FL 0x00000080 /* do not update atime */
> > +#define F2FS_NOCOMP_FL 0x00000400 /* Don't compress */
> > #define F2FS_INDEX_FL 0x00001000 /* hash-indexed directory */
> > #define F2FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
> > #define F2FS_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
> > @@ -2390,7 +2494,7 @@ static inline void f2fs_change_bit(unsigned int nr, char *addr)
> > /* Flags that should be inherited by new inodes from their parent. */
> > #define F2FS_FL_INHERITED (F2FS_SYNC_FL | F2FS_NODUMP_FL | F2FS_NOATIME_FL | \
> > F2FS_DIRSYNC_FL | F2FS_PROJINHERIT_FL | \
> > - F2FS_CASEFOLD_FL)
> > + F2FS_CASEFOLD_FL | F2FS_COMPR_FL | F2FS_NOCOMP_FL)
> >
> > /* Flags that are appropriate for regular files (all but dir-specific ones). */
> > #define F2FS_REG_FLMASK (~(F2FS_DIRSYNC_FL | F2FS_PROJINHERIT_FL | \
> > @@ -2442,6 +2546,8 @@ enum {
> > FI_PIN_FILE, /* indicate file should not be gced */
> > FI_ATOMIC_REVOKE_REQUEST, /* request to drop atomic data */
> > FI_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */
> > + FI_COMPRESSED_FILE, /* indicate file's data can be compressed */
> > + FI_MMAP_FILE, /* indicate file was mmapped */
> > };
> >
> > static inline void __mark_inode_dirty_flag(struct inode *inode,
> > @@ -2458,6 +2564,7 @@ static inline void __mark_inode_dirty_flag(struct inode *inode,
> > case FI_DATA_EXIST:
> > case FI_INLINE_DOTS:
> > case FI_PIN_FILE:
> > + case FI_COMPRESSED_FILE:
> > f2fs_mark_inode_dirty_sync(inode, true);
> > }
> > }
> > @@ -2613,16 +2720,39 @@ static inline int f2fs_has_inline_xattr(struct inode *inode)
> > return is_inode_flag_set(inode, FI_INLINE_XATTR);
> > }
> >
> > +static inline int f2fs_compressed_file(struct inode *inode)
> > +{
> > + return S_ISREG(inode->i_mode) &&
> > + is_inode_flag_set(inode, FI_COMPRESSED_FILE);
> > +}
> > +
> > +static inline void set_compress_context(struct inode *inode)
> > +{
> > + struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> > +
> > + F2FS_I(inode)->i_compress_algorithm =
> > + F2FS_OPTION(sbi).compress_algorithm;
> > + F2FS_I(inode)->i_log_cluster_size =
> > + F2FS_OPTION(sbi).compress_log_size;
> > + F2FS_I(inode)->i_cluster_size =
> > + 1 << F2FS_I(inode)->i_log_cluster_size;
> > +}
> > +
> > static inline unsigned int addrs_per_inode(struct inode *inode)
> > {
> > unsigned int addrs = CUR_ADDRS_PER_INODE(inode) -
> > get_inline_xattr_addrs(inode);
> > - return ALIGN_DOWN(addrs, 1);
> > +
> > + if (!f2fs_compressed_file(inode))
> > + return addrs;
> > + return ALIGN_DOWN(addrs, F2FS_I(inode)->i_cluster_size);
> > }
> >
> > static inline unsigned int addrs_per_block(struct inode *inode)
> > {
> > - return ALIGN_DOWN(DEF_ADDRS_PER_BLOCK, 1);
> > + if (!f2fs_compressed_file(inode))
> > + return DEF_ADDRS_PER_BLOCK;
> > + return ALIGN_DOWN(DEF_ADDRS_PER_BLOCK, F2FS_I(inode)->i_cluster_size);
> > }
> >
> > static inline void *inline_xattr_addr(struct inode *inode, struct page *page)
> > @@ -2655,6 +2785,11 @@ static inline int f2fs_has_inline_dots(struct inode *inode)
> > return is_inode_flag_set(inode, FI_INLINE_DOTS);
> > }
> >
> > +static inline int f2fs_is_mmap_file(struct inode *inode)
> > +{
> > + return is_inode_flag_set(inode, FI_MMAP_FILE);
> > +}
> > +
> > static inline bool f2fs_is_pinned_file(struct inode *inode)
> > {
> > return is_inode_flag_set(inode, FI_PIN_FILE);
> > @@ -2782,7 +2917,8 @@ static inline bool f2fs_may_extent_tree(struct inode *inode)
> > struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> >
> > if (!test_opt(sbi, EXTENT_CACHE) ||
> > - is_inode_flag_set(inode, FI_NO_EXTENT))
> > + is_inode_flag_set(inode, FI_NO_EXTENT) ||
> > + is_inode_flag_set(inode, FI_COMPRESSED_FILE))
> > return false;
> >
> > /*
> > @@ -2896,7 +3032,8 @@ static inline void verify_blkaddr(struct f2fs_sb_info *sbi,
> >
> > static inline bool __is_valid_data_blkaddr(block_t blkaddr)
> > {
> > - if (blkaddr == NEW_ADDR || blkaddr == NULL_ADDR)
> > + if (blkaddr == NEW_ADDR || blkaddr == NULL_ADDR ||
> > + blkaddr == COMPRESS_ADDR)
> > return false;
> > return true;
> > }
> > @@ -3198,10 +3335,10 @@ void f2fs_destroy_checkpoint_caches(void);
> > /*
> > * data.c
> > */
> > -int f2fs_init_post_read_processing(void);
> > -void f2fs_destroy_post_read_processing(void);
> > int f2fs_init_bio_entry_cache(void);
> > void f2fs_destroy_bio_entry_cache(void);
> > +void f2fs_submit_bio(struct f2fs_sb_info *sbi,
> > + struct bio *bio, enum page_type type);
> > void f2fs_submit_merged_write(struct f2fs_sb_info *sbi, enum page_type type);
> > void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi,
> > struct inode *inode, struct page *page,
> > @@ -3222,6 +3359,9 @@ int f2fs_reserve_new_block(struct dnode_of_data *dn);
> > int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index);
> > int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from);
> > int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index);
> > +int f2fs_mpage_readpages(struct address_space *mapping,
> > + struct list_head *pages, struct page *page,
> > + unsigned nr_pages, bool is_readahead);
> > struct page *f2fs_get_read_data_page(struct inode *inode, pgoff_t index,
> > int op_flags, bool for_write);
> > struct page *f2fs_find_data_page(struct inode *inode, pgoff_t index);
> > @@ -3235,8 +3375,13 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
> > int create, int flag);
> > int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
> > u64 start, u64 len);
> > +int f2fs_encrypt_one_page(struct f2fs_io_info *fio);
> > bool f2fs_should_update_inplace(struct inode *inode, struct f2fs_io_info *fio);
> > bool f2fs_should_update_outplace(struct inode *inode, struct f2fs_io_info *fio);
> > +int f2fs_write_single_data_page(struct page *page, int *submitted,
> > + struct bio **bio, sector_t *last_block,
> > + struct writeback_control *wbc,
> > + enum iostat_type io_type);
> > void f2fs_invalidate_page(struct page *page, unsigned int offset,
> > unsigned int length);
> > int f2fs_release_page(struct page *page, gfp_t wait);
> > @@ -3246,6 +3391,10 @@ int f2fs_migrate_page(struct address_space *mapping, struct page *newpage,
> > #endif
> > bool f2fs_overwrite_io(struct inode *inode, loff_t pos, size_t len);
> > void f2fs_clear_page_cache_dirty_tag(struct page *page);
> > +int f2fs_init_post_read_processing(void);
> > +void f2fs_destroy_post_read_processing(void);
> > +int f2fs_init_post_read_wq(struct f2fs_sb_info *sbi);
> > +void f2fs_destroy_post_read_wq(struct f2fs_sb_info *sbi);
> >
> > /*
> > * gc.c
> > @@ -3292,6 +3441,7 @@ struct f2fs_stat_info {
> > int nr_discard_cmd;
> > unsigned int undiscard_blks;
> > int inline_xattr, inline_inode, inline_dir, append, update, orphans;
> > + int compr_inode, compr_blocks;
> > int aw_cnt, max_aw_cnt, vw_cnt, max_vw_cnt;
> > unsigned int valid_count, valid_node_count, valid_inode_count, discard_blks;
> > unsigned int bimodal, avg_vblocks;
> > @@ -3362,6 +3512,20 @@ static inline struct f2fs_stat_info *F2FS_STAT(struct f2fs_sb_info *sbi)
> > if (f2fs_has_inline_dentry(inode)) \
> > (atomic_dec(&F2FS_I_SB(inode)->inline_dir)); \
> > } while (0)
> > +#define stat_inc_compr_inode(inode) \
> > + do { \
> > + if (f2fs_compressed_file(inode)) \
> > + (atomic_inc(&F2FS_I_SB(inode)->compr_inode)); \
> > + } while (0)
> > +#define stat_dec_compr_inode(inode) \
> > + do { \
> > + if (f2fs_compressed_file(inode)) \
> > + (atomic_dec(&F2FS_I_SB(inode)->compr_inode)); \
> > + } while (0)
> > +#define stat_add_compr_blocks(inode, blocks) \
> > + (atomic_add(blocks, &F2FS_I_SB(inode)->compr_blocks))
> > +#define stat_sub_compr_blocks(inode, blocks) \
> > + (atomic_sub(blocks, &F2FS_I_SB(inode)->compr_blocks))
> > #define stat_inc_meta_count(sbi, blkaddr) \
> > do { \
> > if (blkaddr < SIT_I(sbi)->sit_base_addr) \
> > @@ -3456,6 +3620,10 @@ void f2fs_destroy_root_stats(void);
> > #define stat_dec_inline_inode(inode) do { } while (0)
> > #define stat_inc_inline_dir(inode) do { } while (0)
> > #define stat_dec_inline_dir(inode) do { } while (0)
> > +#define stat_inc_compr_inode(inode) do { } while (0)
> > +#define stat_dec_compr_inode(inode) do { } while (0)
> > +#define stat_add_compr_blocks(inode) do { } while (0)
> > +#define stat_sub_compr_blocks(inode) do { } while (0)
> > #define stat_inc_atomic_write(inode) do { } while (0)
> > #define stat_dec_atomic_write(inode) do { } while (0)
> > #define stat_update_max_atomic_write(inode) do { } while (0)
> > @@ -3595,8 +3763,57 @@ static inline void f2fs_set_encrypted_inode(struct inode *inode)
> > */
> > static inline bool f2fs_post_read_required(struct inode *inode)
> > {
> > - return f2fs_encrypted_file(inode) || fsverity_active(inode);
> > + return f2fs_encrypted_file(inode) || fsverity_active(inode) ||
> > + f2fs_compressed_file(inode);
> > +}
> > +
> > +/*
> > + * compress.c
> > + */
> > +#ifdef CONFIG_F2FS_FS_COMPRESSION
> > +bool f2fs_is_compressed_page(struct page *page);
> > +struct page *f2fs_compress_control_page(struct page *page);
> > +void f2fs_reset_compress_ctx(struct compress_ctx *cc);
> > +int f2fs_prepare_compress_overwrite(struct inode *inode,
> > + struct page **pagep, pgoff_t index, void **fsdata);
> > +bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
> > + pgoff_t index, bool written);
> > +void f2fs_compress_write_end_io(struct bio *bio, struct page *page);
> > +bool f2fs_is_compress_backend_ready(struct inode *inode);
> > +void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity);
> > +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);
> > +int f2fs_write_multi_pages(struct compress_ctx *cc,
> > + int *submitted,
> > + struct writeback_control *wbc,
> > + enum iostat_type io_type);
> > +int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index);
> > +int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
> > + unsigned nr_pages, sector_t *last_block_in_bio,
> > + bool is_readahead);
> > +struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc);
> > +void f2fs_free_dic(struct decompress_io_ctx *dic);
> > +void f2fs_set_cluster_uptodate(struct page **rpages,
> > + unsigned int cluster_size, bool err, bool verity);
> > +int f2fs_init_compress_ctx(struct compress_ctx *cc);
> > +void f2fs_destroy_compress_ctx(struct compress_ctx *cc);
> > +void f2fs_init_compress_info(struct f2fs_sb_info *sbi);
> > +#else
> > +static inline bool f2fs_is_compressed_page(struct page *page) { return false; }
> > +static inline bool f2fs_is_compress_backend_ready(struct inode *inode)
> > +{
> > + if (!f2fs_compressed_file(inode))
> > + return true;
> > + /* not support compression */
> > + return false;
> > +}
> > +static inline struct page *f2fs_compress_control_page(struct page *page)
> > +{
> > + WARN_ON_ONCE(1);
> > + return ERR_PTR(-EINVAL);
> > }
> > +#endif
> >
> > #define F2FS_FEATURE_FUNCS(name, flagname) \
> > static inline int f2fs_sb_has_##name(struct f2fs_sb_info *sbi) \
> > @@ -3616,6 +3833,7 @@ F2FS_FEATURE_FUNCS(lost_found, LOST_FOUND);
> > F2FS_FEATURE_FUNCS(verity, VERITY);
> > F2FS_FEATURE_FUNCS(sb_chksum, SB_CHKSUM);
> > F2FS_FEATURE_FUNCS(casefold, CASEFOLD);
> > +F2FS_FEATURE_FUNCS(compression, COMPRESSION);
> >
> > #ifdef CONFIG_BLK_DEV_ZONED
> > static inline bool f2fs_blkz_is_seq(struct f2fs_sb_info *sbi, int devi,
> > @@ -3697,6 +3915,15 @@ static inline bool f2fs_may_encrypt(struct inode *inode)
> > #endif
> > }
> >
> > +static inline bool f2fs_may_compress(struct inode *inode)
> > +{
> > + if (IS_SWAPFILE(inode) || f2fs_is_pinned_file(inode) ||
> > + f2fs_is_atomic_file(inode) ||
> > + f2fs_is_volatile_file(inode))
> > + return false;
> > + return S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode);
> > +}
> > +
> > static inline int block_unaligned_IO(struct inode *inode,
> > struct kiocb *iocb, struct iov_iter *iter)
> > {
> > @@ -3728,6 +3955,8 @@ static inline bool f2fs_force_buffered_io(struct inode *inode,
> > return true;
> > if (f2fs_is_multi_device(sbi))
> > return true;
> > + if (f2fs_compressed_file(inode))
> > + return true;
> > /*
> > * for blkzoned device, fallback direct IO to buffered IO, so
> > * all IOs can be serialized by log-structured write.
> > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> > index a7d855efc294..15a7c5f1bc9f 100644
> > --- a/fs/f2fs/file.c
> > +++ b/fs/f2fs/file.c
> > @@ -51,7 +51,8 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf)
> > struct inode *inode = file_inode(vmf->vma->vm_file);
> > struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> > struct dnode_of_data dn = { .node_changed = false };
> > - int err;
> > + bool need_alloc = true;
> > + int err = 0;
> >
> > if (unlikely(f2fs_cp_error(sbi))) {
> > err = -EIO;
> > @@ -63,6 +64,20 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf)
> > goto err;
> > }
> >
> > +#ifdef CONFIG_F2FS_FS_COMPRESSION
> > + if (f2fs_compressed_file(inode)) {
> > + int ret = f2fs_is_compressed_cluster(inode, page->index);
> > +
> > + if (ret < 0) {
> > + err = ret;
> > + goto err;
> > + } else if (ret) {
> > + f2fs_bug_on(sbi, ret == CLUSTER_HAS_SPACE);
> > + need_alloc = false;
> > + }
> > + }
> > +#endif
> > +
> > sb_start_pagefault(inode->i_sb);
> >
> > f2fs_bug_on(sbi, f2fs_has_inline_data(inode));
> > @@ -78,15 +93,17 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf)
> > goto out_sem;
> > }
> >
> > - /* block allocation */
> > - __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true);
> > - set_new_dnode(&dn, inode, NULL, NULL, 0);
> > - err = f2fs_get_block(&dn, page->index);
> > - f2fs_put_dnode(&dn);
> > - __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false);
> > - if (err) {
> > - unlock_page(page);
> > - goto out_sem;
> > + if (need_alloc) {
> > + /* block allocation */
> > + __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, true);
> > + set_new_dnode(&dn, inode, NULL, NULL, 0);
> > + err = f2fs_get_block(&dn, page->index);
> > + f2fs_put_dnode(&dn);
> > + __do_map_lock(sbi, F2FS_GET_BLOCK_PRE_AIO, false);
> > + if (err) {
> > + unlock_page(page);
> > + goto out_sem;
> > + }
> > }
> >
> > /* fill the page */
> > @@ -485,6 +502,9 @@ static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
> > if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
> > return -EIO;
> >
> > + if (!f2fs_is_compress_backend_ready(inode))
> > + return -EOPNOTSUPP;
> > +
> > /* we don't need to use inline_data strictly */
> > err = f2fs_convert_inline_inode(inode);
> > if (err)
> > @@ -492,6 +512,7 @@ static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
> >
> > file_accessed(file);
> > vma->vm_ops = &f2fs_file_vm_ops;
> > + set_inode_flag(inode, FI_MMAP_FILE);
> > return 0;
> > }
> >
> > @@ -518,6 +539,9 @@ void f2fs_truncate_data_blocks_range(struct dnode_of_data *dn, int count)
> > int nr_free = 0, ofs = dn->ofs_in_node, len = count;
> > __le32 *addr;
> > int base = 0;
> > + bool compressed_cluster = false;
> > + int cluster_index = 0, valid_blocks = 0;
> > + int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
> >
> > if (IS_INODE(dn->node_page) && f2fs_has_extra_attr(dn->inode))
> > base = get_extra_isize(dn->inode);
> > @@ -525,26 +549,51 @@ void f2fs_truncate_data_blocks_range(struct dnode_of_data *dn, int count)
> > raw_node = F2FS_NODE(dn->node_page);
> > addr = blkaddr_in_node(raw_node) + base + ofs;
> >
> > - for (; count > 0; count--, addr++, dn->ofs_in_node++) {
> > + /* Assumption: truncateion starts with cluster */
> > + for (; count > 0; count--, addr++, dn->ofs_in_node++, cluster_index++) {
> > block_t blkaddr = le32_to_cpu(*addr);
> >
> > + if (f2fs_compressed_file(dn->inode) &&
> > + !(cluster_index & (cluster_size - 1))) {
> > + if (compressed_cluster) {
> > + int compr_blocks = cluster_size - valid_blocks;
> > +
> > + stat_sub_compr_blocks(dn->inode, compr_blocks);
> > + F2FS_I(dn->inode)->i_compressed_blocks -=
> > + compr_blocks;
> > + }
> > + compressed_cluster = (blkaddr == COMPRESS_ADDR);
> > + valid_blocks = 0;
> > + }
> > +
> > if (blkaddr == NULL_ADDR)
> > continue;
> >
> > dn->data_blkaddr = NULL_ADDR;
> > f2fs_set_data_blkaddr(dn);
> >
> > - if (__is_valid_data_blkaddr(blkaddr) &&
> > - !f2fs_is_valid_blkaddr(sbi, blkaddr,
> > + if (__is_valid_data_blkaddr(blkaddr)) {
> > + if (!f2fs_is_valid_blkaddr(sbi, blkaddr,
> > DATA_GENERIC_ENHANCE))
> > - continue;
> > + continue;
> > + if (compressed_cluster)
> > + valid_blocks++;
> > + }
> >
> > - f2fs_invalidate_blocks(sbi, blkaddr);
> > if (dn->ofs_in_node == 0 && IS_INODE(dn->node_page))
> > clear_inode_flag(dn->inode, FI_FIRST_BLOCK_WRITTEN);
> > +
> > + f2fs_invalidate_blocks(sbi, blkaddr);
> > nr_free++;
> > }
> >
> > + if (compressed_cluster) {
> > + int compr_blocks = cluster_size - valid_blocks;
> > +
> > + stat_sub_compr_blocks(dn->inode, compr_blocks);
> > + F2FS_I(dn->inode)->i_compressed_blocks -= compr_blocks;
> > + }
> > +
> > if (nr_free) {
> > pgoff_t fofs;
> > /*
> > @@ -587,6 +636,9 @@ static int truncate_partial_data_page(struct inode *inode, u64 from,
> > return 0;
> > }
> >
> > + if (f2fs_compressed_file(inode))
> > + return 0;
> > +
> > page = f2fs_get_lock_data_page(inode, index, true);
> > if (IS_ERR(page))
> > return PTR_ERR(page) == -ENOENT ? 0 : PTR_ERR(page);
> > @@ -602,7 +654,7 @@ static int truncate_partial_data_page(struct inode *inode, u64 from,
> > return 0;
> > }
> >
> > -int f2fs_truncate_blocks(struct inode *inode, u64 from, bool lock)
> > +static int do_truncate_blocks(struct inode *inode, u64 from, bool lock)
> > {
> > struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> > struct dnode_of_data dn;
> > @@ -667,6 +719,24 @@ int f2fs_truncate_blocks(struct inode *inode, u64 from, bool lock)
> > return err;
> > }
> >
> > +int f2fs_truncate_blocks(struct inode *inode, u64 from, bool lock)
> > +{
> > + u64 free_from = from;
> > +
> > + /*
> > + * for compressed file, only support cluster size
> > + * aligned truncation.
> > + */
> > + if (f2fs_compressed_file(inode)) {
> > + size_t cluster_size = PAGE_SIZE <<
> > + F2FS_I(inode)->i_log_cluster_size;
> > +
> > + free_from = roundup(from, cluster_size);
> > + }
> > +
> > + return do_truncate_blocks(inode, free_from, lock);
> > +}
> > +
> > int f2fs_truncate(struct inode *inode)
> > {
> > int err;
> > @@ -783,6 +853,10 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
> > if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
> > return -EIO;
> >
> > + if ((attr->ia_valid & ATTR_SIZE) &&
> > + !f2fs_is_compress_backend_ready(inode))
> > + return -EOPNOTSUPP;
> > +
> > err = setattr_prepare(dentry, attr);
> > if (err)
> > return err;
> > @@ -1023,8 +1097,8 @@ static int __read_out_blkaddrs(struct inode *inode, block_t *blkaddr,
> > } else if (ret == -ENOENT) {
> > if (dn.max_level == 0)
> > return -ENOENT;
> > - done = min((pgoff_t)ADDRS_PER_BLOCK(inode) - dn.ofs_in_node,
> > - len);
> > + done = min((pgoff_t)ADDRS_PER_BLOCK(inode) -
> > + dn.ofs_in_node, len);
> > blkaddr += done;
> > do_replace += done;
> > goto next;
> > @@ -1615,6 +1689,8 @@ static long f2fs_fallocate(struct file *file, int mode,
> > return -EIO;
> > if (!f2fs_is_checkpoint_ready(F2FS_I_SB(inode)))
> > return -ENOSPC;
> > + if (!f2fs_is_compress_backend_ready(inode))
> > + return -EOPNOTSUPP;
> >
> > /* f2fs only support ->fallocate for regular file */
> > if (!S_ISREG(inode->i_mode))
> > @@ -1624,6 +1700,11 @@ static long f2fs_fallocate(struct file *file, int mode,
> > (mode & (FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)))
> > return -EOPNOTSUPP;
> >
> > + if (f2fs_compressed_file(inode) &&
> > + (mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_COLLAPSE_RANGE |
> > + FALLOC_FL_ZERO_RANGE | FALLOC_FL_INSERT_RANGE)))
> > + return -EOPNOTSUPP;
> > +
> > if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
> > FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE |
> > FALLOC_FL_INSERT_RANGE))
> > @@ -1713,7 +1794,42 @@ static int f2fs_setflags_common(struct inode *inode, u32 iflags, u32 mask)
> > return -ENOTEMPTY;
> > }
> >
> > + if (iflags & (F2FS_COMPR_FL | F2FS_NOCOMP_FL)) {
> > + if (!f2fs_sb_has_compression(F2FS_I_SB(inode)))
> > + return -EOPNOTSUPP;
> > + if ((iflags & F2FS_COMPR_FL) && (iflags & F2FS_NOCOMP_FL))
> > + return -EINVAL;
> > + }
> > +
> > + if ((iflags ^ fi->i_flags) & F2FS_COMPR_FL) {
> > + if (S_ISREG(inode->i_mode) &&
> > + (fi->i_flags & F2FS_COMPR_FL || i_size_read(inode) ||
> > + F2FS_HAS_BLOCKS(inode)))
> > + return -EINVAL;
> > + if (iflags & F2FS_NOCOMP_FL)
> > + return -EINVAL;
> > + if (iflags & F2FS_COMPR_FL) {
> > + int err = f2fs_convert_inline_inode(inode);
> > +
> > + if (err)
> > + return err;
> > +
> > + if (!f2fs_may_compress(inode))
> > + return -EINVAL;
> > +
> > + set_compress_context(inode);
> > + set_inode_flag(inode, FI_COMPRESSED_FILE);
> > + stat_inc_compr_inode(inode);
> > + }
> > + }
> > + if ((iflags ^ fi->i_flags) & F2FS_NOCOMP_FL) {
> > + if (fi->i_flags & F2FS_COMPR_FL)
> > + return -EINVAL;
> > + }
> > +
> > fi->i_flags = iflags | (fi->i_flags & ~mask);
> > + f2fs_bug_on(F2FS_I_SB(inode), (fi->i_flags & F2FS_COMPR_FL) &&
> > + (fi->i_flags & F2FS_NOCOMP_FL));
> >
> > if (fi->i_flags & F2FS_PROJINHERIT_FL)
> > set_inode_flag(inode, FI_PROJ_INHERIT);
> > @@ -1739,11 +1855,13 @@ static const struct {
> > u32 iflag;
> > u32 fsflag;
> > } f2fs_fsflags_map[] = {
> > + { F2FS_COMPR_FL, FS_COMPR_FL },
> > { F2FS_SYNC_FL, FS_SYNC_FL },
> > { F2FS_IMMUTABLE_FL, FS_IMMUTABLE_FL },
> > { F2FS_APPEND_FL, FS_APPEND_FL },
> > { F2FS_NODUMP_FL, FS_NODUMP_FL },
> > { F2FS_NOATIME_FL, FS_NOATIME_FL },
> > + { F2FS_NOCOMP_FL, FS_NOCOMP_FL },
> > { F2FS_INDEX_FL, FS_INDEX_FL },
> > { F2FS_DIRSYNC_FL, FS_DIRSYNC_FL },
> > { F2FS_PROJINHERIT_FL, FS_PROJINHERIT_FL },
> > @@ -1751,11 +1869,13 @@ static const struct {
> > };
> >
> > #define F2FS_GETTABLE_FS_FL ( \
> > + FS_COMPR_FL | \
> > FS_SYNC_FL | \
> > FS_IMMUTABLE_FL | \
> > FS_APPEND_FL | \
> > FS_NODUMP_FL | \
> > FS_NOATIME_FL | \
> > + FS_NOCOMP_FL | \
> > FS_INDEX_FL | \
> > FS_DIRSYNC_FL | \
> > FS_PROJINHERIT_FL | \
> > @@ -1766,11 +1886,13 @@ static const struct {
> > FS_CASEFOLD_FL)
> >
> > #define F2FS_SETTABLE_FS_FL ( \
> > + FS_COMPR_FL | \
> > FS_SYNC_FL | \
> > FS_IMMUTABLE_FL | \
> > FS_APPEND_FL | \
> > FS_NODUMP_FL | \
> > FS_NOATIME_FL | \
> > + FS_NOCOMP_FL | \
> > FS_DIRSYNC_FL | \
> > FS_PROJINHERIT_FL | \
> > FS_CASEFOLD_FL)
> > @@ -1891,6 +2013,12 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
> >
> > inode_lock(inode);
> >
> > + if (f2fs_compressed_file(inode) && !fi->i_compressed_blocks) {
> > + fi->i_flags &= ~F2FS_COMPR_FL;
> > + clear_inode_flag(inode, FI_COMPRESSED_FILE);
> > + stat_dec_compr_inode(inode);
> > + }
> > +
> > if (f2fs_is_atomic_file(inode)) {
> > if (is_inode_flag_set(inode, FI_ATOMIC_REVOKE_REQUEST))
> > ret = -EINVAL;
> > @@ -3091,6 +3219,17 @@ static int f2fs_ioc_set_pin_file(struct file *filp, unsigned long arg)
> > ret = -EAGAIN;
> > goto out;
> > }
> > +
> > + if (f2fs_compressed_file(inode)) {
> > + if (F2FS_I(inode)->i_compressed_blocks) {
> > + ret = -EOPNOTSUPP;
> > + goto out;
> > + }
> > + F2FS_I(inode)->i_flags &= ~F2FS_COMPR_FL;
> > + clear_inode_flag(inode, FI_COMPRESSED_FILE);
> > + stat_dec_compr_inode(inode);
> > + }
> > +
> > ret = f2fs_convert_inline_inode(inode);
> > if (ret)
> > goto out;
> > @@ -3343,6 +3482,17 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> > }
> > }
> >
> > +static ssize_t f2fs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
> > +{
> > + struct file *file = iocb->ki_filp;
> > + struct inode *inode = file_inode(file);
> > +
> > + if (!f2fs_is_compress_backend_ready(inode))
> > + return -EOPNOTSUPP;
> > +
> > + return generic_file_read_iter(iocb, iter);
> > +}
> > +
> > static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
> > {
> > struct file *file = iocb->ki_filp;
> > @@ -3354,6 +3504,9 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
> > goto out;
> > }
> >
> > + if (!f2fs_is_compress_backend_ready(inode))
> > + return -EOPNOTSUPP;
> > +
> > if (iocb->ki_flags & IOCB_NOWAIT) {
> > if (!inode_trylock(inode)) {
> > ret = -EAGAIN;
> > @@ -3467,7 +3620,7 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
> >
> > const struct file_operations f2fs_file_operations = {
> > .llseek = f2fs_llseek,
> > - .read_iter = generic_file_read_iter,
> > + .read_iter = f2fs_file_read_iter,
> > .write_iter = f2fs_file_write_iter,
> > .open = f2fs_file_open,
> > .release = f2fs_release_file,
> > diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
> > index 502bd491336a..7a85060adad5 100644
> > --- a/fs/f2fs/inode.c
> > +++ b/fs/f2fs/inode.c
> > @@ -200,6 +200,7 @@ static bool sanity_check_inode(struct inode *inode, struct page *node_page)
> > {
> > struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> > struct f2fs_inode_info *fi = F2FS_I(inode);
> > + struct f2fs_inode *ri = F2FS_INODE(node_page);
> > unsigned long long iblocks;
> >
> > iblocks = le64_to_cpu(F2FS_INODE(node_page)->i_blocks);
> > @@ -286,6 +287,19 @@ static bool sanity_check_inode(struct inode *inode, struct page *node_page)
> > return false;
> > }
> >
> > + if (f2fs_has_extra_attr(inode) && f2fs_sb_has_compression(sbi) &&
> > + fi->i_flags & F2FS_COMPR_FL &&
> > + F2FS_FITS_IN_INODE(ri, fi->i_extra_isize,
> > + i_log_cluster_size)) {
> > + if (ri->i_compress_algorithm >= COMPRESS_MAX)
> > + return false;
> > + if (le64_to_cpu(ri->i_compressed_blocks) > inode->i_blocks)
> > + return false;
> > + if (ri->i_log_cluster_size < MIN_COMPRESS_LOG_SIZE ||
> > + ri->i_log_cluster_size > MAX_COMPRESS_LOG_SIZE)
> > + return false;
> > + }
> > +
> > return true;
> > }
> >
> > @@ -407,6 +421,20 @@ static int do_read_inode(struct inode *inode)
> > fi->i_crtime.tv_nsec = le32_to_cpu(ri->i_crtime_nsec);
> > }
> >
> > + if (f2fs_has_extra_attr(inode) && f2fs_sb_has_compression(sbi)) {
> > + if (F2FS_FITS_IN_INODE(ri, fi->i_extra_isize,
> > + i_log_cluster_size)) {
> > + fi->i_compressed_blocks =
> > + le64_to_cpu(ri->i_compressed_blocks);
> > + fi->i_compress_algorithm = ri->i_compress_algorithm;
> > + fi->i_log_cluster_size = ri->i_log_cluster_size;
> > + fi->i_cluster_size = 1 << fi->i_log_cluster_size;
> > + }
> > +
> > + if ((fi->i_flags & F2FS_COMPR_FL) && f2fs_may_compress(inode))
> > + set_inode_flag(inode, FI_COMPRESSED_FILE);
> > + }
> > +
> > F2FS_I(inode)->i_disk_time[0] = inode->i_atime;
> > F2FS_I(inode)->i_disk_time[1] = inode->i_ctime;
> > F2FS_I(inode)->i_disk_time[2] = inode->i_mtime;
> > @@ -416,6 +444,8 @@ static int do_read_inode(struct inode *inode)
> > stat_inc_inline_xattr(inode);
> > stat_inc_inline_inode(inode);
> > stat_inc_inline_dir(inode);
> > + stat_inc_compr_inode(inode);
> > + stat_add_compr_blocks(inode, F2FS_I(inode)->i_compressed_blocks);
> >
> > return 0;
> > }
> > @@ -569,6 +599,17 @@ void f2fs_update_inode(struct inode *inode, struct page *node_page)
> > ri->i_crtime_nsec =
> > cpu_to_le32(F2FS_I(inode)->i_crtime.tv_nsec);
> > }
> > +
> > + if (f2fs_sb_has_compression(F2FS_I_SB(inode)) &&
> > + F2FS_FITS_IN_INODE(ri, F2FS_I(inode)->i_extra_isize,
> > + i_log_cluster_size)) {
> > + ri->i_compressed_blocks =
> > + cpu_to_le64(F2FS_I(inode)->i_compressed_blocks);
> > + ri->i_compress_algorithm =
> > + F2FS_I(inode)->i_compress_algorithm;
> > + ri->i_log_cluster_size =
> > + F2FS_I(inode)->i_log_cluster_size;
> > + }
> > }
> >
> > __set_inode_rdev(inode, ri);
> > @@ -711,6 +752,8 @@ void f2fs_evict_inode(struct inode *inode)
> > stat_dec_inline_xattr(inode);
> > stat_dec_inline_dir(inode);
> > stat_dec_inline_inode(inode);
> > + stat_dec_compr_inode(inode);
> > + stat_sub_compr_blocks(inode, F2FS_I(inode)->i_compressed_blocks);
> >
> > if (likely(!f2fs_cp_error(sbi) &&
> > !is_sbi_flag_set(sbi, SBI_CP_DISABLED)))
> > diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
> > index d8ca896e109b..5490348bcc6a 100644
> > --- a/fs/f2fs/namei.c
> > +++ b/fs/f2fs/namei.c
> > @@ -119,6 +119,17 @@ static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
> > if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL)
> > set_inode_flag(inode, FI_PROJ_INHERIT);
> >
> > + if (f2fs_sb_has_compression(sbi)) {
> > + /* Inherit the compression flag in directory */
> > + if ((F2FS_I(dir)->i_flags & F2FS_COMPR_FL) &&
> > + f2fs_may_compress(inode)) {
> > + set_compress_context(inode);
> > + F2FS_I(inode)->i_flags |= F2FS_COMPR_FL;
> > + set_inode_flag(inode, FI_COMPRESSED_FILE);
> > + stat_inc_compr_inode(inode);
> > + }
> > + }
> > +
> > f2fs_set_inode_flags(inode);
> >
> > trace_f2fs_new_inode(inode, 0);
> > @@ -149,6 +160,9 @@ static inline int is_extension_exist(const unsigned char *s, const char *sub)
> > size_t sublen = strlen(sub);
> > int i;
> >
> > + if (sublen == 1 && *sub == '*')
> > + return 1;
> > +
> > /*
> > * filename format of multimedia file should be defined as:
> > * "filename + '.' + extension + (optional: '.' + temp extension)".
> > @@ -262,6 +276,48 @@ int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
> > return 0;
> > }
> >
> > +static void set_compress_inode(struct f2fs_sb_info *sbi, struct inode *inode,
> > + const unsigned char *name)
> > +{
> > + __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
> > + unsigned char (*ext)[F2FS_EXTENSION_LEN];
> > + unsigned int ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt;
> > + int i, cold_count, hot_count;
> > +
> > + if (!f2fs_sb_has_compression(sbi) ||
> > + is_inode_flag_set(inode, FI_COMPRESSED_FILE) ||
> > + F2FS_I(inode)->i_flags & F2FS_NOCOMP_FL ||
> > + !f2fs_may_compress(inode))
> > + return;
> > +
> > + down_read(&sbi->sb_lock);
> > +
> > + cold_count = le32_to_cpu(sbi->raw_super->extension_count);
> > + hot_count = sbi->raw_super->hot_ext_count;
> > +
> > + for (i = cold_count; i < cold_count + hot_count; i++) {
> > + if (is_extension_exist(name, extlist[i])) {
> > + up_read(&sbi->sb_lock);
> > + return;
> > + }
> > + }
> > +
> > + up_read(&sbi->sb_lock);
> > +
> > + ext = F2FS_OPTION(sbi).extensions;
> > +
> > + for (i = 0; i < ext_cnt; i++) {
> > + if (!is_extension_exist(name, ext[i]))
> > + continue;
> > +
> > + F2FS_I(inode)->i_flags |= F2FS_COMPR_FL;
> > + set_compress_context(inode);
> > + set_inode_flag(inode, FI_COMPRESSED_FILE);
> > + stat_inc_compr_inode(inode);
> > + return;
> > + }
> > +}
> > +
> > static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
> > bool excl)
> > {
> > @@ -286,6 +342,8 @@ static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
> > if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
> > set_file_temperature(sbi, inode, dentry->d_name.name);
> >
> > + set_compress_inode(sbi, inode, dentry->d_name.name);
> > +
> > inode->i_op = &f2fs_file_inode_operations;
> > inode->i_fop = &f2fs_file_operations;
> > inode->i_mapping->a_ops = &f2fs_dblock_aops;
> > @@ -297,6 +355,7 @@ static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
> > goto out;
> > f2fs_unlock_op(sbi);
> >
> > + stat_inc_compr_inode(inode);
> > f2fs_alloc_nid_done(sbi, ino);
> >
> > d_instantiate_new(dentry, inode);
> > diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> > index 8c96d6008e20..8b977bbd6822 100644
> > --- a/fs/f2fs/segment.c
> > +++ b/fs/f2fs/segment.c
> > @@ -2215,7 +2215,7 @@ void f2fs_invalidate_blocks(struct f2fs_sb_info *sbi, block_t addr)
> > struct sit_info *sit_i = SIT_I(sbi);
> >
> > f2fs_bug_on(sbi, addr == NULL_ADDR);
> > - if (addr == NEW_ADDR)
> > + if (addr == NEW_ADDR || addr == COMPRESS_ADDR)
> > return;
> >
> > invalidate_mapping_pages(META_MAPPING(sbi), addr, addr);
> > @@ -3022,7 +3022,8 @@ static int __get_segment_type_6(struct f2fs_io_info *fio)
> > if (fio->type == DATA) {
> > struct inode *inode = fio->page->mapping->host;
> >
> > - if (is_cold_data(fio->page) || file_is_cold(inode))
> > + if (is_cold_data(fio->page) || file_is_cold(inode) ||
> > + f2fs_compressed_file(inode))
> > return CURSEG_COLD_DATA;
> > if (file_is_hot(inode) ||
> > is_inode_flag_set(inode, FI_HOT_DATA) ||
> > diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
> > index a95467b202ea..a1b3951367cd 100644
> > --- a/fs/f2fs/segment.h
> > +++ b/fs/f2fs/segment.h
> > @@ -200,18 +200,6 @@ struct segment_allocation {
> > void (*allocate_segment)(struct f2fs_sb_info *, int, bool);
> > };
> >
> > -/*
> > - * this value is set in page as a private data which indicate that
> > - * the page is atomically written, and it is in inmem_pages list.
> > - */
> > -#define ATOMIC_WRITTEN_PAGE ((unsigned long)-1)
> > -#define DUMMY_WRITTEN_PAGE ((unsigned long)-2)
> > -
> > -#define IS_ATOMIC_WRITTEN_PAGE(page) \
> > - (page_private(page) == (unsigned long)ATOMIC_WRITTEN_PAGE)
> > -#define IS_DUMMY_WRITTEN_PAGE(page) \
> > - (page_private(page) == (unsigned long)DUMMY_WRITTEN_PAGE)
> > -
> > #define MAX_SKIP_GC_COUNT 16
> >
> > struct inmem_pages {
> > diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> > index b72d071aedd8..a543ee6b898c 100644
> > --- a/fs/f2fs/super.c
> > +++ b/fs/f2fs/super.c
> > @@ -141,6 +141,9 @@ enum {
> > Opt_checkpoint_disable_cap,
> > Opt_checkpoint_disable_cap_perc,
> > Opt_checkpoint_enable,
> > + Opt_compress_algorithm,
> > + Opt_compress_log_size,
> > + Opt_compress_extension,
> > Opt_err,
> > };
> >
> > @@ -203,6 +206,9 @@ static match_table_t f2fs_tokens = {
> > {Opt_checkpoint_disable_cap, "checkpoint=disable:%u"},
> > {Opt_checkpoint_disable_cap_perc, "checkpoint=disable:%u%%"},
> > {Opt_checkpoint_enable, "checkpoint=enable"},
> > + {Opt_compress_algorithm, "compress_algorithm=%s"},
> > + {Opt_compress_log_size, "compress_log_size=%u"},
> > + {Opt_compress_extension, "compress_extension=%s"},
> > {Opt_err, NULL},
> > };
> >
> > @@ -391,8 +397,9 @@ static int parse_options(struct super_block *sb, char *options)
> > {
> > struct f2fs_sb_info *sbi = F2FS_SB(sb);
> > substring_t args[MAX_OPT_ARGS];
> > + unsigned char (*ext)[F2FS_EXTENSION_LEN];
> > char *p, *name;
> > - int arg = 0;
> > + int arg = 0, ext_cnt;
> > kuid_t uid;
> > kgid_t gid;
> > #ifdef CONFIG_QUOTA
> > @@ -810,6 +817,66 @@ static int parse_options(struct super_block *sb, char *options)
> > case Opt_checkpoint_enable:
> > clear_opt(sbi, DISABLE_CHECKPOINT);
> > break;
> > + case Opt_compress_algorithm:
> > + if (!f2fs_sb_has_compression(sbi)) {
> > + f2fs_err(sbi, "Compression feature if off");
> > + return -EINVAL;
> > + }
> > + name = match_strdup(&args[0]);
> > + if (!name)
> > + return -ENOMEM;
> > + if (strlen(name) == 3 && !strcmp(name, "lzo")) {
> > + F2FS_OPTION(sbi).compress_algorithm =
> > + COMPRESS_LZO;
> > + } else if (strlen(name) == 3 &&
> > + !strcmp(name, "lz4")) {
> > + F2FS_OPTION(sbi).compress_algorithm =
> > + COMPRESS_LZ4;
> > + } else {
> > + kfree(name);
> > + return -EINVAL;
> > + }
> > + kfree(name);
> > + break;
> > + case Opt_compress_log_size:
> > + if (!f2fs_sb_has_compression(sbi)) {
> > + f2fs_err(sbi, "Compression feature is off");
> > + return -EINVAL;
> > + }
> > + if (args->from && match_int(args, &arg))
> > + return -EINVAL;
> > + if (arg < MIN_COMPRESS_LOG_SIZE ||
> > + arg > MAX_COMPRESS_LOG_SIZE) {
> > + f2fs_err(sbi,
> > + "Compress cluster log size is out of range");
> > + return -EINVAL;
> > + }
> > + F2FS_OPTION(sbi).compress_log_size = arg;
> > + break;
> > + case Opt_compress_extension:
> > + if (!f2fs_sb_has_compression(sbi)) {
> > + f2fs_err(sbi, "Compression feature is off");
> > + return -EINVAL;
> > + }
> > + name = match_strdup(&args[0]);
> > + if (!name)
> > + return -ENOMEM;
> > +
> > + ext = F2FS_OPTION(sbi).extensions;
> > + ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt;
> > +
> > + if (strlen(name) >= F2FS_EXTENSION_LEN ||
> > + ext_cnt >= COMPRESS_EXT_NUM) {
> > + f2fs_err(sbi,
> > + "invalid extension length/number");
> > + kfree(name);
> > + return -EINVAL;
> > + }
> > +
> > + strcpy(ext[ext_cnt], name);
> > + F2FS_OPTION(sbi).compress_ext_cnt++;
> > + kfree(name);
> > + break;
> > default:
> > f2fs_err(sbi, "Unrecognized mount option \"%s\" or missing value",
> > p);
> > @@ -1125,6 +1192,8 @@ static void f2fs_put_super(struct super_block *sb)
> > f2fs_destroy_node_manager(sbi);
> > f2fs_destroy_segment_manager(sbi);
> >
> > + f2fs_destroy_post_read_wq(sbi);
> > +
> > kfree(sbi->ckpt);
> >
> > f2fs_unregister_sysfs(sbi);
> > @@ -1332,6 +1401,35 @@ static inline void f2fs_show_quota_options(struct seq_file *seq,
> > #endif
> > }
> >
> > +static inline void f2fs_show_compress_options(struct seq_file *seq,
> > + struct super_block *sb)
> > +{
> > + struct f2fs_sb_info *sbi = F2FS_SB(sb);
> > + char *algtype = "";
> > + int i;
> > +
> > + if (!f2fs_sb_has_compression(sbi))
> > + return;
> > +
> > + switch (F2FS_OPTION(sbi).compress_algorithm) {
> > + case COMPRESS_LZO:
> > + algtype = "lzo";
> > + break;
> > + case COMPRESS_LZ4:
> > + algtype = "lz4";
> > + break;
> > + }
> > + seq_printf(seq, ",compress_algorithm=%s", algtype);
> > +
> > + seq_printf(seq, ",compress_log_size=%u",
> > + F2FS_OPTION(sbi).compress_log_size);
> > +
> > + for (i = 0; i < F2FS_OPTION(sbi).compress_ext_cnt; i++) {
> > + seq_printf(seq, ",compress_extension=%s",
> > + F2FS_OPTION(sbi).extensions[i]);
> > + }
> > +}
> > +
> > static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
> > {
> > struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
> > @@ -1454,6 +1552,8 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
> > seq_printf(seq, ",fsync_mode=%s", "strict");
> > else if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_NOBARRIER)
> > seq_printf(seq, ",fsync_mode=%s", "nobarrier");
> > +
> > + f2fs_show_compress_options(seq, sbi->sb);
> > return 0;
> > }
> >
> > @@ -1468,6 +1568,9 @@ static void default_options(struct f2fs_sb_info *sbi)
> > F2FS_OPTION(sbi).test_dummy_encryption = false;
> > F2FS_OPTION(sbi).s_resuid = make_kuid(&init_user_ns, F2FS_DEF_RESUID);
> > F2FS_OPTION(sbi).s_resgid = make_kgid(&init_user_ns, F2FS_DEF_RESGID);
> > + F2FS_OPTION(sbi).compress_algorithm = COMPRESS_LZO;
> > + F2FS_OPTION(sbi).compress_log_size = MIN_COMPRESS_LOG_SIZE;
> > + F2FS_OPTION(sbi).compress_ext_cnt = 0;
> >
> > set_opt(sbi, BG_GC);
> > set_opt(sbi, INLINE_XATTR);
> > @@ -3397,6 +3500,12 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
> > goto free_devices;
> > }
> >
> > + err = f2fs_init_post_read_wq(sbi);
> > + if (err) {
> > + f2fs_err(sbi, "Failed to initialize post read workqueue");
> > + goto free_devices;
> > + }
> > +
> > sbi->total_valid_node_count =
> > le32_to_cpu(sbi->ckpt->valid_node_count);
> > percpu_counter_set(&sbi->total_valid_inode_count,
> > @@ -3618,6 +3727,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
> > f2fs_destroy_node_manager(sbi);
> > free_sm:
> > f2fs_destroy_segment_manager(sbi);
> > + f2fs_destroy_post_read_wq(sbi);
> > free_devices:
> > destroy_device_list(sbi);
> > kfree(sbi->ckpt);
> > diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> > index f164959e4224..612a2b16d55c 100644
> > --- a/fs/f2fs/sysfs.c
> > +++ b/fs/f2fs/sysfs.c
> > @@ -154,6 +154,9 @@ static ssize_t features_show(struct f2fs_attr *a,
> > if (f2fs_sb_has_casefold(sbi))
> > len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
> > len ? ", " : "", "casefold");
> > + if (f2fs_sb_has_compression(sbi))
> > + len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
> > + len ? ", " : "", "compression");
> > len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
> > len ? ", " : "", "pin_file");
> > len += snprintf(buf + len, PAGE_SIZE - len, "\n");
> > @@ -389,6 +392,7 @@ enum feat_id {
> > FEAT_VERITY,
> > FEAT_SB_CHECKSUM,
> > FEAT_CASEFOLD,
> > + FEAT_COMPRESSION,
> > };
> >
> > static ssize_t f2fs_feature_show(struct f2fs_attr *a,
> > @@ -408,6 +412,7 @@ static ssize_t f2fs_feature_show(struct f2fs_attr *a,
> > case FEAT_VERITY:
> > case FEAT_SB_CHECKSUM:
> > case FEAT_CASEFOLD:
> > + case FEAT_COMPRESSION:
> > return snprintf(buf, PAGE_SIZE, "supported\n");
> > }
> > return 0;
> > @@ -502,6 +507,7 @@ F2FS_FEATURE_RO_ATTR(verity, FEAT_VERITY);
> > #endif
> > F2FS_FEATURE_RO_ATTR(sb_checksum, FEAT_SB_CHECKSUM);
> > F2FS_FEATURE_RO_ATTR(casefold, FEAT_CASEFOLD);
> > +F2FS_FEATURE_RO_ATTR(compression, FEAT_COMPRESSION);
> >
> > #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
> > static struct attribute *f2fs_attrs[] = {
> > @@ -571,6 +577,7 @@ static struct attribute *f2fs_feat_attrs[] = {
> > #endif
> > ATTR_LIST(sb_checksum),
> > ATTR_LIST(casefold),
> > + ATTR_LIST(compression),
> > NULL,
> > };
> > ATTRIBUTE_GROUPS(f2fs_feat);
> > diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
> > index 284738996028..cc203883b31d 100644
> > --- a/include/linux/f2fs_fs.h
> > +++ b/include/linux/f2fs_fs.h
> > @@ -21,8 +21,15 @@
> > #define F2FS_EXTENSION_LEN 8 /* max size of extension */
> > #define F2FS_BLK_ALIGN(x) (((x) + F2FS_BLKSIZE - 1) >> F2FS_BLKSIZE_BITS)
> >
> > +#define CLUSTER_IS_FULL 1
> > +#define CLUSTER_HAS_SPACE 2
> > +
> > +#define COMPRESSED_CLUSTER 1
> > +#define NORMAL_CLUSTER 2
>
> I removed the above defs.
>
> > +
> > #define NULL_ADDR ((block_t)0) /* used as block_t addresses */
> > #define NEW_ADDR ((block_t)-1) /* used as block_t addresses */
> > +#define COMPRESS_ADDR ((block_t)-2) /* used as compressed data flag */
> >
> > #define F2FS_BYTES_TO_BLK(bytes) ((bytes) >> F2FS_BLKSIZE_BITS)
> > #define F2FS_BLK_TO_BYTES(blk) ((blk) << F2FS_BLKSIZE_BITS)
> > @@ -271,6 +278,10 @@ struct f2fs_inode {
> > __le32 i_inode_checksum;/* inode meta checksum */
> > __le64 i_crtime; /* creation time */
> > __le32 i_crtime_nsec; /* creation time in nano scale */
> > + __le64 i_compressed_blocks; /* # of compressed blocks */
> > + __u8 i_compress_algorithm; /* compress algorithm */
> > + __u8 i_log_cluster_size; /* log of cluster size */
> > + __le16 i_padding; /* padding */
> > __le32 i_extra_end[0]; /* for attribute size calculation */
> > } __packed;
> > __le32 i_addr[DEF_ADDRS_PER_INODE]; /* Pointers to data blocks */
> > diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
> > index 1796ff99c3e9..cb51ea00dbc7 100644
> > --- a/include/trace/events/f2fs.h
> > +++ b/include/trace/events/f2fs.h
> > @@ -148,6 +148,11 @@ TRACE_DEFINE_ENUM(CP_TRIMMED);
> > { F2FS_GOING_DOWN_METAFLUSH, "meta flush" }, \
> > { F2FS_GOING_DOWN_NEED_FSCK, "need fsck" })
> >
> > +#define show_compress_algorithm(type) \
> > + __print_symbolic(type, \
> > + { COMPRESS_LZO, "LZO" }, \
> > + { COMPRESS_LZ4, "LZ4" })
> > +
> > struct f2fs_sb_info;
> > struct f2fs_io_info;
> > struct extent_info;
> > @@ -1710,6 +1715,100 @@ TRACE_EVENT(f2fs_shutdown,
> > __entry->ret)
> > );
> >
> > +DECLARE_EVENT_CLASS(f2fs_zip_start,
> > +
> > + TP_PROTO(struct inode *inode, unsigned int cluster_idx,
> > + unsigned int cluster_size, unsigned char algtype),
> > +
> > + TP_ARGS(inode, cluster_idx, cluster_size, algtype),
> > +
> > + TP_STRUCT__entry(
> > + __field(dev_t, dev)
> > + __field(ino_t, ino)
> > + __field(unsigned int, idx)
> > + __field(unsigned int, size)
> > + __field(unsigned int, algtype)
> > + ),
> > +
> > + TP_fast_assign(
> > + __entry->dev = inode->i_sb->s_dev;
> > + __entry->ino = inode->i_ino;
> > + __entry->idx = cluster_idx;
> > + __entry->size = cluster_size;
> > + __entry->algtype = algtype;
> > + ),
> > +
> > + TP_printk("dev = (%d,%d), ino = %lu, cluster_idx:%u, "
> > + "cluster_size = %u, algorithm = %s",
> > + show_dev_ino(__entry),
> > + __entry->idx,
> > + __entry->size,
> > + show_compress_algorithm(__entry->algtype))
> > +);
> > +
> > +DECLARE_EVENT_CLASS(f2fs_zip_end,
> > +
> > + TP_PROTO(struct inode *inode, unsigned int cluster_idx,
> > + unsigned int compressed_size, int ret),
> > +
> > + TP_ARGS(inode, cluster_idx, compressed_size, ret),
> > +
> > + TP_STRUCT__entry(
> > + __field(dev_t, dev)
> > + __field(ino_t, ino)
> > + __field(unsigned int, idx)
> > + __field(unsigned int, size)
> > + __field(unsigned int, ret)
> > + ),
> > +
> > + TP_fast_assign(
> > + __entry->dev = inode->i_sb->s_dev;
> > + __entry->ino = inode->i_ino;
> > + __entry->idx = cluster_idx;
> > + __entry->size = compressed_size;
> > + __entry->ret = ret;
> > + ),
> > +
> > + TP_printk("dev = (%d,%d), ino = %lu, cluster_idx:%u, "
> > + "compressed_size = %u, ret = %d",
> > + show_dev_ino(__entry),
> > + __entry->idx,
> > + __entry->size,
> > + __entry->ret)
> > +);
> > +
> > +DEFINE_EVENT(f2fs_zip_start, f2fs_compress_pages_start,
> > +
> > + TP_PROTO(struct inode *inode, unsigned int cluster_idx,
> > + unsigned int cluster_size, unsigned char algtype),
> > +
> > + TP_ARGS(inode, cluster_idx, cluster_size, algtype)
> > +);
> > +
> > +DEFINE_EVENT(f2fs_zip_start, f2fs_decompress_pages_start,
> > +
> > + TP_PROTO(struct inode *inode, unsigned int cluster_idx,
> > + unsigned int cluster_size, unsigned char algtype),
> > +
> > + TP_ARGS(inode, cluster_idx, cluster_size, algtype)
> > +);
> > +
> > +DEFINE_EVENT(f2fs_zip_end, f2fs_compress_pages_end,
> > +
> > + TP_PROTO(struct inode *inode, unsigned int cluster_idx,
> > + unsigned int compressed_size, int ret),
> > +
> > + TP_ARGS(inode, cluster_idx, compressed_size, ret)
> > +);
> > +
> > +DEFINE_EVENT(f2fs_zip_end, f2fs_decompress_pages_end,
> > +
> > + TP_PROTO(struct inode *inode, unsigned int cluster_idx,
> > + unsigned int compressed_size, int ret),
> > +
> > + TP_ARGS(inode, cluster_idx, compressed_size, ret)
> > +);
> > +
> > #endif /* _TRACE_F2FS_H */
> >
> > /* This part must be outside protection */
> > --
> > 2.18.0.rc1
>
>
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