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Date: Wed, 31 May 2023 12:27:45 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: Jingbo Xu <jefflexu@...ux.alibaba.com>, xiang@...nel.org,
chao@...nel.org, huyue2@...lpad.com, linux-erofs@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/5] erofs: enhance erofs_xattr_iter_fixup() helper
On 2023/5/31 11:13, Jingbo Xu wrote:
> Enhance erofs_xattr_iter_fixup() helper so that it could be reused in
> the situation where it.ofs could not span the block boundary.
>
> Besides call erofs_init_metabuf() and erofs_bread() separately to avoid
> the repetition of assigning buf->inode when iterating xattrs.
>
> Signed-off-by: Jingbo Xu <jefflexu@...ux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
Thanks,
Gao Xiang
> ---
> fs/erofs/xattr.c | 82 +++++++++++++++++++++---------------------------
> 1 file changed, 35 insertions(+), 47 deletions(-)
>
> diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
> index bbfe7ce170d2..df6c4e6f1f4e 100644
> --- a/fs/erofs/xattr.c
> +++ b/fs/erofs/xattr.c
> @@ -29,6 +29,24 @@ struct xattr_iter {
> unsigned int ofs;
> };
>
> +static inline int erofs_xattr_iter_fixup(struct xattr_iter *it, bool nospan)
> +{
> + if (it->ofs < it->sb->s_blocksize)
> + return 0;
> +
> + if (nospan && it->ofs != it->sb->s_blocksize) {
> + DBG_BUGON(1);
> + return -EFSCORRUPTED;
> + }
> +
> + it->blkaddr += erofs_blknr(it->sb, it->ofs);
> + it->kaddr = erofs_bread(&it->buf, it->blkaddr, EROFS_KMAP);
> + if (IS_ERR(it->kaddr))
> + return PTR_ERR(it->kaddr);
> + it->ofs = erofs_blkoff(it->sb, it->ofs);
> + return 0;
> +}
> +
> static int erofs_init_inode_xattrs(struct inode *inode)
> {
> struct erofs_inode *const vi = EROFS_I(inode);
> @@ -80,6 +98,7 @@ static int erofs_init_inode_xattrs(struct inode *inode)
> goto out_unlock;
> }
>
> + it.sb = sb;
> it.buf = __EROFS_BUF_INITIALIZER;
> it.blkaddr = erofs_blknr(sb, erofs_iloc(inode) + vi->inode_isize);
> it.ofs = erofs_blkoff(sb, erofs_iloc(inode) + vi->inode_isize);
> @@ -105,19 +124,11 @@ static int erofs_init_inode_xattrs(struct inode *inode)
> it.ofs += sizeof(struct erofs_xattr_ibody_header);
>
> for (i = 0; i < vi->xattr_shared_count; ++i) {
> - if (it.ofs >= sb->s_blocksize) {
> - /* cannot be unaligned */
> - DBG_BUGON(it.ofs != sb->s_blocksize);
> -
> - it.kaddr = erofs_read_metabuf(&it.buf, sb, ++it.blkaddr,
> - EROFS_KMAP);
> - if (IS_ERR(it.kaddr)) {
> - kfree(vi->xattr_shared_xattrs);
> - vi->xattr_shared_xattrs = NULL;
> - ret = PTR_ERR(it.kaddr);
> - goto out_unlock;
> - }
> - it.ofs = 0;
> + ret = erofs_xattr_iter_fixup(&it, true);
> + if (ret) {
> + kfree(vi->xattr_shared_xattrs);
> + vi->xattr_shared_xattrs = NULL;
> + goto out_unlock;
> }
> vi->xattr_shared_xattrs[i] =
> le32_to_cpu(*(__le32 *)(it.kaddr + it.ofs));
> @@ -150,20 +161,6 @@ struct xattr_iter_handlers {
> unsigned int len);
> };
>
> -static inline int xattr_iter_fixup(struct xattr_iter *it)
> -{
> - if (it->ofs < it->sb->s_blocksize)
> - return 0;
> -
> - it->blkaddr += erofs_blknr(it->sb, it->ofs);
> - it->kaddr = erofs_read_metabuf(&it->buf, it->sb, it->blkaddr,
> - EROFS_KMAP);
> - if (IS_ERR(it->kaddr))
> - return PTR_ERR(it->kaddr);
> - it->ofs = erofs_blkoff(it->sb, it->ofs);
> - return 0;
> -}
> -
> static int inline_xattr_iter_begin(struct xattr_iter *it,
> struct inode *inode)
> {
> @@ -201,7 +198,7 @@ static int xattr_foreach(struct xattr_iter *it,
> int err;
>
> /* 0. fixup blkaddr, ofs, ipage */
> - err = xattr_iter_fixup(it);
> + err = erofs_xattr_iter_fixup(it, false);
> if (err)
> return err;
>
> @@ -236,14 +233,9 @@ static int xattr_foreach(struct xattr_iter *it,
> processed = 0;
>
> while (processed < entry.e_name_len) {
> - if (it->ofs >= it->sb->s_blocksize) {
> - DBG_BUGON(it->ofs > it->sb->s_blocksize);
> -
> - err = xattr_iter_fixup(it);
> - if (err)
> - goto out;
> - it->ofs = 0;
> - }
> + err = erofs_xattr_iter_fixup(it, true);
> + if (err)
> + goto out;
>
> slice = min_t(unsigned int, it->sb->s_blocksize - it->ofs,
> entry.e_name_len - processed);
> @@ -271,14 +263,9 @@ static int xattr_foreach(struct xattr_iter *it,
> }
>
> while (processed < value_sz) {
> - if (it->ofs >= it->sb->s_blocksize) {
> - DBG_BUGON(it->ofs > it->sb->s_blocksize);
> -
> - err = xattr_iter_fixup(it);
> - if (err)
> - goto out;
> - it->ofs = 0;
> - }
> + err = erofs_xattr_iter_fixup(it, true);
> + if (err)
> + goto out;
>
> slice = min_t(unsigned int, it->sb->s_blocksize - it->ofs,
> value_sz - processed);
> @@ -444,13 +431,14 @@ int erofs_getxattr(struct inode *inode, int index,
> if (it.name.len > EROFS_NAME_LEN)
> return -ERANGE;
>
> + it.it.sb = inode->i_sb;
> it.it.buf = __EROFS_BUF_INITIALIZER;
> + erofs_init_metabuf(&it.it.buf, it.it.sb);
> it.name.name = name;
>
> it.buffer = buffer;
> it.buffer_size = buffer_size;
>
> - it.it.sb = inode->i_sb;
> ret = inline_getxattr(inode, &it);
> if (ret == -ENOATTR)
> ret = shared_getxattr(inode, &it);
> @@ -632,14 +620,14 @@ ssize_t erofs_listxattr(struct dentry *dentry,
> if (ret)
> return ret;
>
> + it.it.sb = dentry->d_sb;
> it.it.buf = __EROFS_BUF_INITIALIZER;
> + erofs_init_metabuf(&it.it.buf, it.it.sb);
> it.dentry = dentry;
> it.buffer = buffer;
> it.buffer_size = buffer_size;
> it.buffer_ofs = 0;
>
> - it.it.sb = dentry->d_sb;
> -
> ret = inline_listxattr(&it);
> if (ret >= 0 || ret == -ENOATTR)
> ret = shared_listxattr(&it);
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