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Date:   Thu, 14 Jul 2022 17:49:59 +0530
From:   Ritesh Harjani <ritesh.list@...il.com>
To:     Jan Kara <jack@...e.cz>
Cc:     Ted Tso <tytso@....edu>, linux-ext4@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH 04/10] ext4: Unindent codeblock in ext4_xattr_block_set()

On 22/07/12 12:54PM, Jan Kara wrote:
> Remove unnecessary else (and thus indentation level) from a code block
> in ext4_xattr_block_set(). It will also make following code changes
> easier. No functional changes.

The patch looks good to me. Just a note, while applying this patch on ext4-dev
tree, I found a minor conflict with below patch.

ext4: use kmemdup() to replace kmalloc + memcpy

Replace kmalloc + memcpy with kmemdup()

-ritesh

>
> CC: stable@...r.kernel.org
> Fixes: 82939d7999df ("ext4: convert to mbcache2")
> Signed-off-by: Jan Kara <jack@...e.cz>
> ---
>  fs/ext4/xattr.c | 79 ++++++++++++++++++++++++-------------------------
>  1 file changed, 39 insertions(+), 40 deletions(-)
>
> diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
> index 7fc40fb1e6b3..aadfae53d055 100644
> --- a/fs/ext4/xattr.c
> +++ b/fs/ext4/xattr.c
> @@ -1850,6 +1850,8 @@ ext4_xattr_block_set(handle_t *handle, struct inode *inode,
>  #define header(x) ((struct ext4_xattr_header *)(x))
>
>  	if (s->base) {
> +		int offset = (char *)s->here - bs->bh->b_data;
> +
>  		BUFFER_TRACE(bs->bh, "get_write_access");
>  		error = ext4_journal_get_write_access(handle, sb, bs->bh,
>  						      EXT4_JTR_NONE);
> @@ -1882,50 +1884,47 @@ ext4_xattr_block_set(handle_t *handle, struct inode *inode,
>  			if (error)
>  				goto cleanup;
>  			goto inserted;
> -		} else {
> -			int offset = (char *)s->here - bs->bh->b_data;
> +		}
> +		unlock_buffer(bs->bh);
> +		ea_bdebug(bs->bh, "cloning");
> +		s->base = kmalloc(bs->bh->b_size, GFP_NOFS);
> +		error = -ENOMEM;
> +		if (s->base == NULL)
> +			goto cleanup;
> +		memcpy(s->base, BHDR(bs->bh), bs->bh->b_size);
> +		s->first = ENTRY(header(s->base)+1);
> +		header(s->base)->h_refcount = cpu_to_le32(1);
> +		s->here = ENTRY(s->base + offset);
> +		s->end = s->base + bs->bh->b_size;
>
> -			unlock_buffer(bs->bh);
> -			ea_bdebug(bs->bh, "cloning");
> -			s->base = kmalloc(bs->bh->b_size, GFP_NOFS);
> -			error = -ENOMEM;
> -			if (s->base == NULL)
> +		/*
> +		 * If existing entry points to an xattr inode, we need
> +		 * to prevent ext4_xattr_set_entry() from decrementing
> +		 * ref count on it because the reference belongs to the
> +		 * original block. In this case, make the entry look
> +		 * like it has an empty value.
> +		 */
> +		if (!s->not_found && s->here->e_value_inum) {
> +			ea_ino = le32_to_cpu(s->here->e_value_inum);
> +			error = ext4_xattr_inode_iget(inode, ea_ino,
> +				      le32_to_cpu(s->here->e_hash),
> +				      &tmp_inode);
> +			if (error)
>  				goto cleanup;
> -			memcpy(s->base, BHDR(bs->bh), bs->bh->b_size);
> -			s->first = ENTRY(header(s->base)+1);
> -			header(s->base)->h_refcount = cpu_to_le32(1);
> -			s->here = ENTRY(s->base + offset);
> -			s->end = s->base + bs->bh->b_size;
>
> -			/*
> -			 * If existing entry points to an xattr inode, we need
> -			 * to prevent ext4_xattr_set_entry() from decrementing
> -			 * ref count on it because the reference belongs to the
> -			 * original block. In this case, make the entry look
> -			 * like it has an empty value.
> -			 */
> -			if (!s->not_found && s->here->e_value_inum) {
> -				ea_ino = le32_to_cpu(s->here->e_value_inum);
> -				error = ext4_xattr_inode_iget(inode, ea_ino,
> -					      le32_to_cpu(s->here->e_hash),
> -					      &tmp_inode);
> -				if (error)
> -					goto cleanup;
> -
> -				if (!ext4_test_inode_state(tmp_inode,
> -						EXT4_STATE_LUSTRE_EA_INODE)) {
> -					/*
> -					 * Defer quota free call for previous
> -					 * inode until success is guaranteed.
> -					 */
> -					old_ea_inode_quota = le32_to_cpu(
> -							s->here->e_value_size);
> -				}
> -				iput(tmp_inode);
> -
> -				s->here->e_value_inum = 0;
> -				s->here->e_value_size = 0;
> +			if (!ext4_test_inode_state(tmp_inode,
> +					EXT4_STATE_LUSTRE_EA_INODE)) {
> +				/*
> +				 * Defer quota free call for previous
> +				 * inode until success is guaranteed.
> +				 */
> +				old_ea_inode_quota = le32_to_cpu(
> +						s->here->e_value_size);
>  			}
> +			iput(tmp_inode);
> +
> +			s->here->e_value_inum = 0;
> +			s->here->e_value_size = 0;
>  		}
>  	} else {
>  		/* Allocate a buffer where we construct the new block. */
> --
> 2.35.3
>

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