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Message-ID: <YfzD4aTbDW2xKlO9@google.com>
Date: Thu, 3 Feb 2022 22:12:49 -0800
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <chao@...nel.org>
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] f2fs: introduce F2FS_IPU_DEFRAG to allow file
defragment in IPU mode
On 02/04, Chao Yu wrote:
> Once IPU policy is enabled in some cases:
> a) f2fs forces to use F2FS_IPU_FORCE in a small-sized volume
> b) user configures IPU policy via sysfs
>
> Then we may fail to defragment file via ioctl due to IPU policy check,
> it doesn't make sense, let's introduce a new IPU policy to allow OPU
> during file defragmentation, by default use IPU_DEFRAG instead of
> IPU_FORCE in small-sized volume for android device.
>
> Signed-off-by: Chao Yu <chao@...nel.org>
> ---
> v2:
> - handle F2FS_IPU_DEFRAG before F2FS_IPU_FORCE in check_inplace_update_policy().
> Documentation/ABI/testing/sysfs-fs-f2fs | 3 ++-
> fs/f2fs/data.c | 18 +++++++++++++-----
> fs/f2fs/f2fs.h | 3 ++-
> fs/f2fs/file.c | 18 +++++++++++-------
> fs/f2fs/segment.h | 8 ++++----
> fs/f2fs/super.c | 2 +-
> 6 files changed, 33 insertions(+), 19 deletions(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
> index ce8103f522cb..d8abb674ee86 100644
> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> @@ -55,8 +55,9 @@ Description: Controls the in-place-update policy.
> 0x04 F2FS_IPU_UTIL
> 0x08 F2FS_IPU_SSR_UTIL
> 0x10 F2FS_IPU_FSYNC
> - 0x20 F2FS_IPU_ASYNC,
> + 0x20 F2FS_IPU_ASYNC
> 0x40 F2FS_IPU_NOCACHE
> + 0x80 F2FS_IPU_DEFRAG
How about F2FS_IPU_HONOR_OPU_WRITE?
> ==== =================
>
> Refer segment.h for details.
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index b3c152de4bba..3c0f001e3fe1 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -2460,6 +2460,9 @@ static inline bool check_inplace_update_policy(struct inode *inode,
> struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> unsigned int policy = SM_I(sbi)->ipu_policy;
>
> + if (policy & (0x1 << F2FS_IPU_DEFRAG) &&
> + is_inode_flag_set(inode, FI_DEFRAG_PROCESS))
> + return false;
> if (policy & (0x1 << F2FS_IPU_FORCE))
> return true;
> if (policy & (0x1 << F2FS_IPU_SSR) && f2fs_need_SSR(sbi))
> @@ -2530,6 +2533,9 @@ bool f2fs_should_update_outplace(struct inode *inode, struct f2fs_io_info *fio)
> if (is_inode_flag_set(inode, FI_ALIGNED_WRITE))
> return true;
>
> + if (is_inode_flag_set(inode, FI_DEFRAG_PROCESS))
> + return true;
> +
> if (fio) {
> if (page_private_gcing(fio->page))
> return true;
> @@ -3154,8 +3160,8 @@ static int __f2fs_write_data_pages(struct address_space *mapping,
> f2fs_available_free_memory(sbi, DIRTY_DENTS))
> goto skip_write;
>
> - /* skip writing during file defragment */
> - if (is_inode_flag_set(inode, FI_DO_DEFRAG))
> + /* skip writing in file defragment preparing stage */
> + if (is_inode_flag_set(inode, FI_DEFRAG_PREPARE))
> goto skip_write;
>
> trace_f2fs_writepages(mapping->host, wbc, DATA);
> @@ -3729,6 +3735,7 @@ static int f2fs_migrate_blocks(struct inode *inode, block_t start_blk,
> filemap_invalidate_lock(inode->i_mapping);
>
> set_inode_flag(inode, FI_ALIGNED_WRITE);
> + set_inode_flag(inode, FI_DEFRAG_PROCESS);
>
> for (; secidx < end_sec; secidx++) {
> f2fs_down_write(&sbi->pin_sem);
> @@ -3737,7 +3744,7 @@ static int f2fs_migrate_blocks(struct inode *inode, block_t start_blk,
> f2fs_allocate_new_section(sbi, CURSEG_COLD_DATA_PINNED, false);
> f2fs_unlock_op(sbi);
>
> - set_inode_flag(inode, FI_DO_DEFRAG);
> + set_inode_flag(inode, FI_DEFRAG_PREPARE);
>
> for (blkofs = 0; blkofs < blk_per_sec; blkofs++) {
> struct page *page;
> @@ -3754,7 +3761,7 @@ static int f2fs_migrate_blocks(struct inode *inode, block_t start_blk,
> f2fs_put_page(page, 1);
> }
>
> - clear_inode_flag(inode, FI_DO_DEFRAG);
> + clear_inode_flag(inode, FI_DEFRAG_PREPARE);
>
> ret = filemap_fdatawrite(inode->i_mapping);
>
> @@ -3765,7 +3772,8 @@ static int f2fs_migrate_blocks(struct inode *inode, block_t start_blk,
> }
>
> done:
> - clear_inode_flag(inode, FI_DO_DEFRAG);
> + clear_inode_flag(inode, FI_DEFRAG_PREPARE);
> + clear_inode_flag(inode, FI_DEFRAG_PROCESS);
> clear_inode_flag(inode, FI_ALIGNED_WRITE);
>
> filemap_invalidate_unlock(inode->i_mapping);
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 6ddb98ff0b7c..5af415208488 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -737,7 +737,8 @@ enum {
> FI_DROP_CACHE, /* drop dirty page cache */
> FI_DATA_EXIST, /* indicate data exists */
> FI_INLINE_DOTS, /* indicate inline dot dentries */
> - FI_DO_DEFRAG, /* indicate defragment is running */
> + FI_DEFRAG_PREPARE, /* indicate defragment is preparing */
This is used for f2fs_migrate_blocks for swap file. Can we rename to
FI_SKIP_WRITES that makes skipping writeback pages?
> + FI_DEFRAG_PROCESS, /* indicate defragment is processing */
How about FI_OPU_WRITE?
> FI_DIRTY_FILE, /* indicate regular/symlink has dirty pages */
> FI_PREALLOCATED_ALL, /* all blocks for write were preallocated */
> FI_HOT_DATA, /* indicate file is hot */
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 6ccdd6e347e2..3a573125002b 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -2559,10 +2559,6 @@ static int f2fs_defragment_range(struct f2fs_sb_info *sbi,
> bool fragmented = false;
> int err;
>
> - /* if in-place-update policy is enabled, don't waste time here */
> - if (f2fs_should_update_inplace(inode, NULL))
> - return -EINVAL;
> -
> pg_start = range->start >> PAGE_SHIFT;
> pg_end = (range->start + range->len) >> PAGE_SHIFT;
>
> @@ -2570,6 +2566,13 @@ static int f2fs_defragment_range(struct f2fs_sb_info *sbi,
>
> inode_lock(inode);
>
> + /* if in-place-update policy is enabled, don't waste time here */
> + set_inode_flag(inode, FI_DEFRAG_PROCESS);
> + if (f2fs_should_update_inplace(inode, NULL)) {
> + err = -EINVAL;
> + goto out;
> + }
> +
> /* writeback all dirty pages in the range */
> err = filemap_write_and_wait_range(inode->i_mapping, range->start,
> range->start + range->len - 1);
> @@ -2651,7 +2654,7 @@ static int f2fs_defragment_range(struct f2fs_sb_info *sbi,
> goto check;
> }
>
> - set_inode_flag(inode, FI_DO_DEFRAG);
> + set_inode_flag(inode, FI_DEFRAG_PREPARE);
>
> idx = map.m_lblk;
> while (idx < map.m_lblk + map.m_len && cnt < blk_per_seg) {
> @@ -2676,15 +2679,16 @@ static int f2fs_defragment_range(struct f2fs_sb_info *sbi,
> if (map.m_lblk < pg_end && cnt < blk_per_seg)
> goto do_map;
>
> - clear_inode_flag(inode, FI_DO_DEFRAG);
> + clear_inode_flag(inode, FI_DEFRAG_PREPARE);
>
> err = filemap_fdatawrite(inode->i_mapping);
> if (err)
> goto out;
> }
> clear_out:
> - clear_inode_flag(inode, FI_DO_DEFRAG);
> + clear_inode_flag(inode, FI_DEFRAG_PREPARE);
> out:
> + clear_inode_flag(inode, FI_DEFRAG_PROCESS);
> inode_unlock(inode);
> if (!err)
> range->len = (u64)total << PAGE_SHIFT;
> diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
> index 0291cd55cf09..a9373861ab1c 100644
> --- a/fs/f2fs/segment.h
> +++ b/fs/f2fs/segment.h
> @@ -651,7 +651,8 @@ static inline int utilization(struct f2fs_sb_info *sbi)
> * pages over min_fsync_blocks. (=default option)
> * F2FS_IPU_ASYNC - do IPU given by asynchronous write requests.
> * F2FS_IPU_NOCACHE - disable IPU bio cache.
> - * F2FS_IPUT_DISABLE - disable IPU. (=default option in LFS mode)
> + * F2FS_IPU_DEFRAG - allow OPU during file defragmentation.
> + * F2FS_IPU_DISABLE - disable IPU. (=default option in LFS mode)
> */
> #define DEF_MIN_IPU_UTIL 70
> #define DEF_MIN_FSYNC_BLOCKS 8
> @@ -667,6 +668,7 @@ enum {
> F2FS_IPU_FSYNC,
> F2FS_IPU_ASYNC,
> F2FS_IPU_NOCACHE,
> + F2FS_IPU_DEFRAG,
> };
>
> static inline unsigned int curseg_segno(struct f2fs_sb_info *sbi,
> @@ -675,9 +677,7 @@ static inline unsigned int curseg_segno(struct f2fs_sb_info *sbi,
> struct curseg_info *curseg = CURSEG_I(sbi, type);
> return curseg->segno;
> }
> -
> -static inline unsigned char curseg_alloc_type(struct f2fs_sb_info *sbi,
> - int type)
> +static inline unsigned char curseg_alloc_type(struct f2fs_sb_info *sbi, int type)
Don't do this.
> {
> struct curseg_info *curseg = CURSEG_I(sbi, type);
> return curseg->alloc_type;
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 9af6c20532ec..cc0429279b4c 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -3957,7 +3957,7 @@ static void f2fs_tuning_parameters(struct f2fs_sb_info *sbi)
> F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_REUSE;
> if (f2fs_block_unit_discard(sbi))
> sm_i->dcc_info->discard_granularity = 1;
> - sm_i->ipu_policy = 1 << F2FS_IPU_FORCE;
No, I think we should have both.
> + sm_i->ipu_policy = 1 << F2FS_IPU_DEFRAG;
> }
>
> sbi->readdir_ra = 1;
> --
> 2.32.0
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