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Date: Wed, 31 Aug 2022 14:00:04 +0200
From: Jan Kara <jack@...e.cz>
To: Jason Yan <yanaijie@...wei.com>
Cc: tytso@....edu, adilger.kernel@...ger.ca, jack@...e.cz,
ritesh.list@...il.com, lczerner@...hat.com,
linux-ext4@...r.kernel.org
Subject: Re: [PATCH 11/13] ext4: factor out ext4_group_desc_init() and
ext4_group_desc_free()
On Tue 30-08-22 20:04:09, Jason Yan wrote:
> Factor out ext4_group_desc_init() and ext4_group_desc_free(). No
> functional change.
>
> Signed-off-by: Jason Yan <yanaijie@...wei.com>
Looks good to me. Feel free to add:
Reviewed-by: Jan Kara <jack@...e.cz>
Honza
> ---
> fs/ext4/super.c | 143 ++++++++++++++++++++++++++++--------------------
> 1 file changed, 84 insertions(+), 59 deletions(-)
>
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 4c6c4930e11b..40f155543df0 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -4743,9 +4743,89 @@ static int ext4_geometry_check(struct super_block *sb,
> return 0;
> }
>
> +static void ext4_group_desc_free(struct ext4_sb_info *sbi)
> +{
> + struct buffer_head **group_desc;
> + int i;
> +
> + rcu_read_lock();
> + group_desc = rcu_dereference(sbi->s_group_desc);
> + for (i = 0; i < sbi->s_gdb_count; i++)
> + brelse(group_desc[i]);
> + kvfree(group_desc);
> + rcu_read_unlock();
> +}
> +
> +static int ext4_group_desc_init(struct super_block *sb,
> + struct ext4_super_block *es,
> + ext4_fsblk_t logical_sb_block,
> + ext4_group_t *first_not_zeroed)
> +{
> + struct ext4_sb_info *sbi = EXT4_SB(sb);
> + unsigned int db_count;
> + ext4_fsblk_t block;
> + int ret;
> + int i;
> +
> + db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
> + EXT4_DESC_PER_BLOCK(sb);
> + if (ext4_has_feature_meta_bg(sb)) {
> + if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
> + ext4_msg(sb, KERN_WARNING,
> + "first meta block group too large: %u "
> + "(group descriptor block count %u)",
> + le32_to_cpu(es->s_first_meta_bg), db_count);
> + return -EINVAL;
> + }
> + }
> + rcu_assign_pointer(sbi->s_group_desc,
> + kvmalloc_array(db_count,
> + sizeof(struct buffer_head *),
> + GFP_KERNEL));
> + if (sbi->s_group_desc == NULL) {
> + ext4_msg(sb, KERN_ERR, "not enough memory");
> + return -ENOMEM;
> + }
> +
> + bgl_lock_init(sbi->s_blockgroup_lock);
> +
> + /* Pre-read the descriptors into the buffer cache */
> + for (i = 0; i < db_count; i++) {
> + block = descriptor_loc(sb, logical_sb_block, i);
> + ext4_sb_breadahead_unmovable(sb, block);
> + }
> +
> + for (i = 0; i < db_count; i++) {
> + struct buffer_head *bh;
> +
> + block = descriptor_loc(sb, logical_sb_block, i);
> + bh = ext4_sb_bread_unmovable(sb, block);
> + if (IS_ERR(bh)) {
> + ext4_msg(sb, KERN_ERR,
> + "can't read group descriptor %d", i);
> + sbi->s_gdb_count = i;
> + ret = PTR_ERR(bh);
> + goto out;
> + }
> + rcu_read_lock();
> + rcu_dereference(sbi->s_group_desc)[i] = bh;
> + rcu_read_unlock();
> + }
> + sbi->s_gdb_count = db_count;
> + if (!ext4_check_descriptors(sb, logical_sb_block, first_not_zeroed)) {
> + ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
> + ret = -EFSCORRUPTED;
> + goto out;
> + }
> + return 0;
> +out:
> + ext4_group_desc_free(sbi);
> + return ret;
> +}
> +
> static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
> {
> - struct buffer_head *bh, **group_desc;
> + struct buffer_head *bh;
> struct ext4_super_block *es = NULL;
> struct ext4_sb_info *sbi = EXT4_SB(sb);
> struct flex_groups **flex_groups;
> @@ -4755,7 +4835,6 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
> struct inode *root;
> int ret = -ENOMEM;
> int blocksize;
> - unsigned int db_count;
> unsigned int i;
> int needs_recovery, has_huge_files;
> int err = 0;
> @@ -5046,57 +5125,9 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
> if (ext4_geometry_check(sb, es))
> goto failed_mount;
>
> - db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
> - EXT4_DESC_PER_BLOCK(sb);
> - if (ext4_has_feature_meta_bg(sb)) {
> - if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
> - ext4_msg(sb, KERN_WARNING,
> - "first meta block group too large: %u "
> - "(group descriptor block count %u)",
> - le32_to_cpu(es->s_first_meta_bg), db_count);
> - goto failed_mount;
> - }
> - }
> - rcu_assign_pointer(sbi->s_group_desc,
> - kvmalloc_array(db_count,
> - sizeof(struct buffer_head *),
> - GFP_KERNEL));
> - if (sbi->s_group_desc == NULL) {
> - ext4_msg(sb, KERN_ERR, "not enough memory");
> - ret = -ENOMEM;
> + err = ext4_group_desc_init(sb, es, logical_sb_block, &first_not_zeroed);
> + if (err)
> goto failed_mount;
> - }
> -
> - bgl_lock_init(sbi->s_blockgroup_lock);
> -
> - /* Pre-read the descriptors into the buffer cache */
> - for (i = 0; i < db_count; i++) {
> - block = descriptor_loc(sb, logical_sb_block, i);
> - ext4_sb_breadahead_unmovable(sb, block);
> - }
> -
> - for (i = 0; i < db_count; i++) {
> - struct buffer_head *bh;
> -
> - block = descriptor_loc(sb, logical_sb_block, i);
> - bh = ext4_sb_bread_unmovable(sb, block);
> - if (IS_ERR(bh)) {
> - ext4_msg(sb, KERN_ERR,
> - "can't read group descriptor %d", i);
> - db_count = i;
> - ret = PTR_ERR(bh);
> - goto failed_mount2;
> - }
> - rcu_read_lock();
> - rcu_dereference(sbi->s_group_desc)[i] = bh;
> - rcu_read_unlock();
> - }
> - sbi->s_gdb_count = db_count;
> - if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
> - ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
> - ret = -EFSCORRUPTED;
> - goto failed_mount2;
> - }
>
> timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
> spin_lock_init(&sbi->s_error_lock);
> @@ -5540,13 +5571,7 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
> flush_work(&sbi->s_error_work);
> del_timer_sync(&sbi->s_err_report);
> ext4_stop_mmpd(sbi);
> -failed_mount2:
> - rcu_read_lock();
> - group_desc = rcu_dereference(sbi->s_group_desc);
> - for (i = 0; i < db_count; i++)
> - brelse(group_desc[i]);
> - kvfree(group_desc);
> - rcu_read_unlock();
> + ext4_group_desc_free(sbi);
> failed_mount:
> if (sbi->s_chksum_driver)
> crypto_free_shash(sbi->s_chksum_driver);
> --
> 2.31.1
>
--
Jan Kara <jack@...e.com>
SUSE Labs, CR
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