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Message-ID: <20201117171309.GA1645652@google.com>
Date: Tue, 17 Nov 2020 09:13:09 -0800
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Daeho Jeong <daeho43@...il.com>
Cc: linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com,
Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [PATCH 1/2] f2fs: add disable_auto_compr mount option
On 11/17, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@...gle.com>
>
> We will add a new disable_auto_compr mount option to turn off the
> automaic compression on the compression enabled file, in order to
> give discretion of choosing the target file and the timing of
> compression to the user.
The aim would be getting compressed inode format but having no compressed
blocks in file contents which will be done by coming ioctls manually by user.
>
> Signed-off-by: Daeho Jeong <daehojeong@...gle.com>
> ---
> Documentation/filesystems/f2fs.rst | 4 ++++
> fs/f2fs/data.c | 10 +++++-----
> fs/f2fs/f2fs.h | 8 ++++++++
> fs/f2fs/segment.c | 2 +-
> fs/f2fs/super.c | 9 +++++++++
> 5 files changed, 27 insertions(+), 6 deletions(-)
>
> diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
> index b8ee761c9922..c36ca1e0f7ab 100644
> --- a/Documentation/filesystems/f2fs.rst
> +++ b/Documentation/filesystems/f2fs.rst
> @@ -260,6 +260,10 @@ compress_extension=%s Support adding specified extension, so that f2fs can enab
> For other files, we can still enable compression via ioctl.
> Note that, there is one reserved special extension '*', it
> can be set to enable compression for all files.
> +disable_auto_compr Even if compression feature is enabled, this option can
> + disable automaic compression on the compression enabled
> + file to give discretion of choosing the target file and
> + the timing of compression to the user.
> inlinecrypt When possible, encrypt/decrypt the contents of encrypted
> files using the blk-crypto framework rather than
> filesystem-layer encryption. This allows the use of
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index c31ec408bd4f..414c8370ab7e 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -2896,7 +2896,7 @@ static int f2fs_write_data_page(struct page *page,
> if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
> goto out;
>
> - if (f2fs_compressed_file(inode)) {
> + if (f2fs_need_compress_write(inode)) {
> if (f2fs_is_compressed_cluster(inode, page->index)) {
> redirty_page_for_writepage(wbc, page);
> return AOP_WRITEPAGE_ACTIVATE;
> @@ -2988,7 +2988,7 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
> readd:
> need_readd = false;
> #ifdef CONFIG_F2FS_FS_COMPRESSION
> - if (f2fs_compressed_file(inode)) {
> + if (f2fs_need_compress_write(inode)) {
> ret = f2fs_init_compress_ctx(&cc);
> if (ret) {
> done = 1;
> @@ -3067,7 +3067,7 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
> goto continue_unlock;
>
> #ifdef CONFIG_F2FS_FS_COMPRESSION
> - if (f2fs_compressed_file(inode)) {
> + if (f2fs_need_compress_write(inode)) {
> get_page(page);
> f2fs_compress_ctx_add_page(&cc, page);
> continue;
> @@ -3120,7 +3120,7 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
> }
> #ifdef CONFIG_F2FS_FS_COMPRESSION
> /* flush remained pages in compress cluster */
> - if (f2fs_compressed_file(inode) && !f2fs_cluster_is_empty(&cc)) {
> + if (f2fs_need_compress_write(inode) && !f2fs_cluster_is_empty(&cc)) {
> ret = f2fs_write_multi_pages(&cc, &submitted, wbc, io_type);
> nwritten += submitted;
> wbc->nr_to_write -= submitted;
> @@ -3162,7 +3162,7 @@ static inline bool __should_serialize_io(struct inode *inode,
> if (IS_NOQUOTA(inode))
> return false;
>
> - if (f2fs_compressed_file(inode))
> + if (f2fs_need_compress_write(inode))
> return true;
> if (wbc->sync_mode != WB_SYNC_ALL)
> return true;
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index a33c90cf979b..c473c78699bc 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -99,6 +99,7 @@ extern const char *f2fs_fault_name[FAULT_MAX];
> #define F2FS_MOUNT_DISABLE_CHECKPOINT 0x02000000
> #define F2FS_MOUNT_NORECOVERY 0x04000000
> #define F2FS_MOUNT_ATGC 0x08000000
> +#define F2FS_MOUNT_DISABLE_AUTO_COMPR 0x10000000
>
> #define F2FS_OPTION(sbi) ((sbi)->mount_opt)
> #define clear_opt(sbi, option) (F2FS_OPTION(sbi).opt &= ~F2FS_MOUNT_##option)
> @@ -2838,6 +2839,13 @@ static inline int f2fs_compressed_file(struct inode *inode)
> is_inode_flag_set(inode, FI_COMPRESSED_FILE);
> }
>
> +static inline int f2fs_need_compress_write(struct inode *inode)
> +{
> + if (test_opt(F2FS_I_SB(inode), DISABLE_AUTO_COMPR))
> + return 0;
> + return f2fs_compressed_file(inode);
> +}
> +
> static inline unsigned int addrs_per_inode(struct inode *inode)
> {
> unsigned int addrs = CUR_ADDRS_PER_INODE(inode) -
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index a0d7a7e04bc7..f56a8b6bbee7 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -3245,7 +3245,7 @@ static int __get_segment_type_6(struct f2fs_io_info *fio)
> else
> return CURSEG_COLD_DATA;
> }
> - if (file_is_cold(inode) || f2fs_compressed_file(inode))
> + if (file_is_cold(inode) || f2fs_need_compress_write(inode))
> return CURSEG_COLD_DATA;
> if (file_is_hot(inode) ||
> is_inode_flag_set(inode, FI_HOT_DATA) ||
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 5bb523bf32a6..909c1543b282 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -146,6 +146,7 @@ enum {
> Opt_compress_algorithm,
> Opt_compress_log_size,
> Opt_compress_extension,
> + Opt_disable_auto_compr,
> Opt_atgc,
> Opt_err,
> };
> @@ -214,6 +215,7 @@ static match_table_t f2fs_tokens = {
> {Opt_compress_algorithm, "compress_algorithm=%s"},
> {Opt_compress_log_size, "compress_log_size=%u"},
> {Opt_compress_extension, "compress_extension=%s"},
> + {Opt_disable_auto_compr, "disable_auto_compr"},
> {Opt_atgc, "atgc"},
> {Opt_err, NULL},
> };
> @@ -934,10 +936,14 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
> F2FS_OPTION(sbi).compress_ext_cnt++;
> kfree(name);
> break;
> + case Opt_disable_auto_compr:
> + set_opt(sbi, DISABLE_AUTO_COMPR);
> + break;
> #else
> case Opt_compress_algorithm:
> case Opt_compress_log_size:
> case Opt_compress_extension:
> + case Opt_disable_auto_compr:
> f2fs_info(sbi, "compression options not supported");
> break;
> #endif
> @@ -1511,6 +1517,9 @@ static inline void f2fs_show_compress_options(struct seq_file *seq,
> seq_printf(seq, ",compress_extension=%s",
> F2FS_OPTION(sbi).extensions[i]);
> }
> +
> + if (test_opt(sbi, DISABLE_AUTO_COMPR))
> + seq_puts(seq, ",disable_auto_compr");
> }
>
> static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
> --
> 2.29.2.299.gdc1121823c-goog
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