linux-kernel - Re: [f2fs-dev] [PATCH 2/2] f2fs: remove unnecessary block size check in init_f2fs

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Message-ID: <CAHJ8P3J4Z7QJ=kpd_Nt+TGX2ZD8HH5YQWmbPsbS7+DeN2NrxyA@mail.gmail.com>
Date: Tue, 16 Apr 2024 19:12:42 +0800
From: Zhiguo Niu <niuzhiguo84@...il.com>
To: Chao Yu <chao@...nel.org>
Cc: jaegeuk@...nel.org, linux-kernel@...r.kernel.org, 
	linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 2/2] f2fs: remove unnecessary block size check
 in init_f2fs_fs()

On Tue, Apr 16, 2024 at 3:22 PM Chao Yu <chao@...nel.org> wrote:
>
> After commit d7e9a9037de2 ("f2fs: Support Block Size == Page Size"),
> F2FS_BLKSIZE equals to PAGE_SIZE, remove unnecessary check condition.
>
> Signed-off-by: Chao Yu <chao@...nel.org>
> ---
>  fs/f2fs/super.c | 6 ------
>  1 file changed, 6 deletions(-)
>
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 6d1e4fc629e2..32aa6d6fa871 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -4933,12 +4933,6 @@ static int __init init_f2fs_fs(void)
>  {
>         int err;
>
> -       if (PAGE_SIZE != F2FS_BLKSIZE) {
> -               printk("F2FS not supported on PAGE_SIZE(%lu) != BLOCK_SIZE(%lu)\n",
> -                               PAGE_SIZE, F2FS_BLKSIZE);
> -               return -EINVAL;
> -       }
> -
>         err = init_inodecache();
>         if (err)
>                 goto fail;
Dear Chao,

Can you help modify the following  comment msg together with this patch?
They are also related to commit d7e9a9037de2 ("f2fs: Support Block
Size == Page Size").
If you think there is a more suitable description, please help modify
it directly.
thanks！

diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
index a357287..241e7b18 100644
--- a/include/linux/f2fs_fs.h
+++ b/include/linux/f2fs_fs.h
@@ -394,7 +394,8 @@ struct f2fs_nat_block {

 /*
  * F2FS uses 4 bytes to represent block address. As a result, supported size of
- * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.
+ * disk is 16 TB for a 4K page size and 64 TB for a 16K page size and it equals
+ * to 16 * 1024 * 1024 / 2 segments.
  */
 #define F2FS_MAX_SEGMENT       ((16 * 1024 * 1024) / 2)

@@ -424,8 +425,10 @@ struct f2fs_sit_block {
 /*
  * For segment summary
  *
- * One summary block contains exactly 512 summary entries, which represents
- * exactly one segment by default. Not allow to change the basic units.
+ * One summary block with 4KB size contains exactly 512 summary entries, which
+ * represents exactly one segment with 2MB size.
+ * Similarly, in the case of 16k block size, it represents one
segment with 8MB size.
+ * Not allow to change the basic units.
  *
  * NOTE: For initializing fields, you must use set_summary
  *
@@ -556,6 +559,7 @@ struct f2fs_summary_block {

 /*
  * space utilization of regular dentry and inline dentry (w/o extra
reservation)
+ * when block size is 4KB.



> --
> 2.40.1
>
>
>
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