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Message-ID: <ca27aa75-40a4-4c82-8d84-7968b2ab89d4@linux.alibaba.com>
Date: Thu, 17 Oct 2024 15:58:04 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: Barry Song <21cnbao@...il.com>, xiang@...nel.org, chao@...nel.org,
linux-erofs@...ts.ozlabs.org
Cc: huyue2@...lpad.com, jefflexu@...ux.alibaba.com, dhavale@...gle.com,
linux-kernel@...r.kernel.org, Barry Song <v-songbaohua@...o.com>
Subject: Re: [PATCH RFC] fs: erofs: support PG_mappedtodisk flag for folios
with zero-filled
Hi Barry,
On 2024/10/17 15:43, Barry Song wrote:
> From: Barry Song <v-songbaohua@...o.com>
>
> When a folio has never been zero-filled, mark it as mappedtodisk
> to allow other software components to recognize and utilize the
> flag.
>
> Signed-off-by: Barry Song <v-songbaohua@...o.com>
Thanks for this!
It looks good to me as an improvement as long as PG_mappedtodisk
is long-term lived and useful to users.
Reviewed-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
Thanks,
Gao Xiang
> ---
> fs/erofs/fileio.c | 2 ++
> fs/erofs/zdata.c | 6 +++++-
> 2 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/fs/erofs/fileio.c b/fs/erofs/fileio.c
> index 3af96b1e2c2a..aa4cb438ea95 100644
> --- a/fs/erofs/fileio.c
> +++ b/fs/erofs/fileio.c
> @@ -88,6 +88,7 @@ static int erofs_fileio_scan_folio(struct erofs_fileio *io, struct folio *folio)
> struct erofs_map_blocks *map = &io->map;
> unsigned int cur = 0, end = folio_size(folio), len, attached = 0;
> loff_t pos = folio_pos(folio), ofs;
> + bool fully_mapped = true;
> struct iov_iter iter;
> struct bio_vec bv;
> int err = 0;
> @@ -124,6 +125,7 @@ static int erofs_fileio_scan_folio(struct erofs_fileio *io, struct folio *folio)
> erofs_put_metabuf(&buf);
> } else if (!(map->m_flags & EROFS_MAP_MAPPED)) {
> folio_zero_segment(folio, cur, cur + len);
> + fully_mapped = false;
> attached = 0;
> } else {
> if (io->rq && (map->m_pa + ofs != io->dev.m_pa ||
> diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
> index 8936790618c6..0158de4f3d95 100644
> --- a/fs/erofs/zdata.c
> +++ b/fs/erofs/zdata.c
> @@ -926,7 +926,7 @@ static int z_erofs_scan_folio(struct z_erofs_decompress_frontend *f,
> const loff_t offset = folio_pos(folio);
> const unsigned int bs = i_blocksize(inode);
> unsigned int end = folio_size(folio), split = 0, cur, pgs;
> - bool tight, excl;
> + bool tight, excl, fully_mapped = true;
> int err = 0;
>
> tight = (bs == PAGE_SIZE);
> @@ -949,6 +949,7 @@ static int z_erofs_scan_folio(struct z_erofs_decompress_frontend *f,
>
> if (!(map->m_flags & EROFS_MAP_MAPPED)) {
> folio_zero_segment(folio, cur, end);
> + fully_mapped = false;
> tight = false;
> } else if (map->m_flags & EROFS_MAP_FRAGMENT) {
> erofs_off_t fpos = offset + cur - map->m_la;
> @@ -1009,6 +1010,9 @@ static int z_erofs_scan_folio(struct z_erofs_decompress_frontend *f,
> tight = (bs == PAGE_SIZE);
> }
> } while ((end = cur) > 0);
> +
> + if (fully_mapped)
> + folio_set_mappedtodisk(folio);
> erofs_onlinefolio_end(folio, err);
> return err;
> }
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