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Date: Sun, 7 Jun 2020 09:33:01 +0900
From: Namjae Jeon <linkinjeon@...nel.org>
To: Tetsuhiro Kohada <kohada.t2@...il.com>
Cc: kohada.tetsuhiro@...mitsubishielectric.co.jp,
mori.takahiro@...mitsubishielectric.co.jp,
motai.hirotaka@...mitsubishielectric.co.jp,
Sungjong Seo <sj1557.seo@...sung.com>,
Namjae Jeon <namjae.jeon@...sung.com>,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] exfat: add error check when updating dir-entries
2020-06-04 17:44 GMT+09:00, Tetsuhiro Kohada <kohada.t2@...il.com>:
Hi Tetsuhiro,
> Add error check when synchronously updating dir-entries.
> Furthermore, add exfat_update_bhs(). It wait for write completion once
> instead of sector by sector.
This patch can be split into two also ?
>
> Suggested-by: Sungjong Seo <sj1557.seo@...sung.com>
> Signed-off-by: Tetsuhiro Kohada <kohada.t2@...il.com>
> ---
> fs/exfat/dir.c | 15 +++++++++------
> fs/exfat/exfat_fs.h | 3 ++-
> fs/exfat/file.c | 5 ++++-
> fs/exfat/inode.c | 8 +++++---
> fs/exfat/misc.c | 19 +++++++++++++++++++
> 5 files changed, 39 insertions(+), 11 deletions(-)
>
> diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c
> index de43534aa299..3eb8386fb5f2 100644
> --- a/fs/exfat/dir.c
> +++ b/fs/exfat/dir.c
> @@ -602,16 +602,19 @@ void exfat_update_dir_chksum_with_entry_set(struct
> exfat_entry_set_cache *es)
> es->modified = true;
> }
>
> -void exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync)
> +int exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync)
> {
> - int i;
> + int i, err = 0;
>
> - for (i = 0; i < es->num_bh; i++) {
> - if (es->modified)
> - exfat_update_bh(es->sb, es->bh[i], sync);
> - brelse(es->bh[i]);
> + if (es->modified) {
> + set_bit(EXFAT_SB_DIRTY, &EXFAT_SB(es->sb)->s_state);
EXFAT_SB_DIRTY set can be merged into exfat_update_bhs() ?
> + err = exfat_update_bhs(es->bh, es->num_bh, sync);
> }
> +
> + for (i = 0; i < es->num_bh; i++)
> + err ? bforget(es->bh[i]):brelse(es->bh[i]);
> kfree(es);
> + return err;
> }
>
> static int exfat_walk_fat_chain(struct super_block *sb,
> diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h
> index 595f3117f492..f4fa0e833486 100644
> --- a/fs/exfat/exfat_fs.h
> +++ b/fs/exfat/exfat_fs.h
> @@ -462,7 +462,7 @@ struct exfat_dentry *exfat_get_dentry_cached(struct
> exfat_entry_set_cache *es,
> int num);
> struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb,
> struct exfat_chain *p_dir, int entry, unsigned int type);
> -void exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync);
> +int exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync);
> int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain
> *p_dir);
>
> /* inode.c */
> @@ -515,6 +515,7 @@ void exfat_set_entry_time(struct exfat_sb_info *sbi,
> struct timespec64 *ts,
> u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type);
> u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type);
> void exfat_update_bh(struct super_block *sb, struct buffer_head *bh, int
> sync);
> +int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync);
> void exfat_chain_set(struct exfat_chain *ec, unsigned int dir,
> unsigned int size, unsigned char flags);
> void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec);
> diff --git a/fs/exfat/file.c b/fs/exfat/file.c
> index fce03f318787..37c8f04c1f8a 100644
> --- a/fs/exfat/file.c
> +++ b/fs/exfat/file.c
> @@ -153,6 +153,7 @@ int __exfat_truncate(struct inode *inode, loff_t
> new_size)
> struct timespec64 ts;
> struct exfat_dentry *ep, *ep2;
> struct exfat_entry_set_cache *es;
> + int err;
>
> es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
> ES_ALL_ENTRIES);
> @@ -187,7 +188,9 @@ int __exfat_truncate(struct inode *inode, loff_t
> new_size)
> }
>
> exfat_update_dir_chksum_with_entry_set(es);
> - exfat_free_dentry_set(es, inode_needs_sync(inode));
> + err = exfat_free_dentry_set(es, inode_needs_sync(inode));
> + if (err)
> + return err;
> }
>
> /* cut off from the FAT chain */
> diff --git a/fs/exfat/inode.c b/fs/exfat/inode.c
> index ef7cf7a6d187..c0bfd1a586aa 100644
> --- a/fs/exfat/inode.c
> +++ b/fs/exfat/inode.c
> @@ -77,8 +77,7 @@ static int __exfat_write_inode(struct inode *inode, int
> sync)
> ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
>
> exfat_update_dir_chksum_with_entry_set(es);
> - exfat_free_dentry_set(es, sync);
> - return 0;
> + return exfat_free_dentry_set(es, sync);
> }
>
> int exfat_write_inode(struct inode *inode, struct writeback_control *wbc)
> @@ -222,6 +221,7 @@ static int exfat_map_cluster(struct inode *inode,
> unsigned int clu_offset,
> if (ei->dir.dir != DIR_DELETED && modified) {
> struct exfat_dentry *ep;
> struct exfat_entry_set_cache *es;
> + int err;
>
> es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
> ES_ALL_ENTRIES);
> @@ -240,7 +240,9 @@ static int exfat_map_cluster(struct inode *inode,
> unsigned int clu_offset,
> ep->dentry.stream.valid_size;
>
> exfat_update_dir_chksum_with_entry_set(es);
> - exfat_free_dentry_set(es, inode_needs_sync(inode));
> + err = exfat_free_dentry_set(es, inode_needs_sync(inode));
> + if (err)
> + return err;
>
> } /* end of if != DIR_DELETED */
>
> diff --git a/fs/exfat/misc.c b/fs/exfat/misc.c
> index 17d41f3d3709..dc34968e99d3 100644
> --- a/fs/exfat/misc.c
> +++ b/fs/exfat/misc.c
> @@ -173,6 +173,25 @@ void exfat_update_bh(struct super_block *sb, struct
> buffer_head *bh, int sync)
> sync_dirty_buffer(bh);
> }
>
> +int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync)
> +{
> + int i, err = 0;
> +
> + for (i = 0; i < nr_bhs; i++) {
> + set_buffer_uptodate(bhs[i]);
> + mark_buffer_dirty(bhs[i]);
> + if (sync)
> + write_dirty_buffer(bhs[i], 0);
> + }
> +
> + for (i = 0; i < nr_bhs && sync; i++) {
> + wait_on_buffer(bhs[i]);
> + if (!buffer_uptodate(bhs[i]))
> + err = -EIO;
> + }
> + return err;
> +}
> +
> void exfat_chain_set(struct exfat_chain *ec, unsigned int dir,
> unsigned int size, unsigned char flags)
> {
> --
> 2.25.1
>
>
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