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Date: Mon, 12 Jun 2023 11:01:39 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: Jingbo Xu <jefflexu@...ux.alibaba.com>, chao@...nel.org,
huyue2@...lpad.com, linux-erofs@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 4/5] erofs: unify inline/share xattr iterators for
listxattr/getxattr
On 2023/6/8 19:30, Jingbo Xu wrote:
> Make inline_getxattr() and inline_listxattr() unified as
> iter_inline_xattr(), shared_getxattr() and shared_listxattr() unified as
erofs_xattr_iter_inline() as well as shared_getxattr() and
shared_listxattr() unified as erofs_xattr_iter_shared() ?
> iter_shared_xattr().
>
> After the unification, both iter_inline_xattr() and iter_shared_xattr()
> return 0 on success, and negative error on failure.
After these changes, both erofs_xattr_iter_{inline,shared} return 0 on
success, and negative values on failure.
>
> One thing worth noting is that, the logic of returning it->buffer_ofs
> when there's no shared xattrs in shared_listxattr() is moved to
> erofs_listxattr() to make the unification possible. The only difference
> is that, semantically the old behavior will return ENOATTR rather than
> it->buffer_ofs if ENOATTR encountered when listxattr is parsing upon a
> specific shared xattr, while now the new behavior will return
> it->buffer_ofs in this case. This is not an issue, as listxattr upon a
> specific xattr won't return ENOATTR.
>
> Signed-off-by: Jingbo Xu <jefflexu@...ux.alibaba.com>
Otherwise it looks good to me.
Thanks,
Gao Xiang
> ---
> fs/erofs/xattr.c | 188 ++++++++++++++++++-----------------------------
> 1 file changed, 73 insertions(+), 115 deletions(-)
>
> diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
> index 4ae9b7cdd3ac..15a1a4042205 100644
> --- a/fs/erofs/xattr.c
> +++ b/fs/erofs/xattr.c
> @@ -139,27 +139,6 @@ struct xattr_iter_handlers {
> unsigned int len);
> };
>
> -static int inline_xattr_iter_begin(struct erofs_xattr_iter *it,
> - struct inode *inode)
> -{
> - struct erofs_inode *const vi = EROFS_I(inode);
> - unsigned int xattr_header_sz;
> -
> - xattr_header_sz = sizeof(struct erofs_xattr_ibody_header) +
> - sizeof(u32) * vi->xattr_shared_count;
> - if (xattr_header_sz >= vi->xattr_isize) {
> - DBG_BUGON(xattr_header_sz > vi->xattr_isize);
> - return -ENOATTR;
> - }
> -
> - it->pos = erofs_iloc(inode) + vi->inode_isize + xattr_header_sz;
> - it->kaddr = erofs_bread(&it->buf, erofs_blknr(it->sb, it->pos),
> - EROFS_KMAP);
> - if (IS_ERR(it->kaddr))
> - return PTR_ERR(it->kaddr);
> - return vi->xattr_isize - xattr_header_sz;
> -}
> -
> /*
> * Regardless of success or failure, `xattr_foreach' will end up with
> * `pos' pointing to the next xattr item rather than an arbitrary position.
> @@ -333,47 +312,6 @@ static const struct xattr_iter_handlers find_xattr_handlers = {
> .value = xattr_copyvalue
> };
>
> -static int inline_getxattr(struct inode *inode, struct erofs_xattr_iter *it)
> -{
> - int ret;
> - unsigned int remaining;
> -
> - ret = inline_xattr_iter_begin(it, inode);
> - if (ret < 0)
> - return ret;
> -
> - remaining = ret;
> - while (remaining) {
> - ret = xattr_foreach(it, &find_xattr_handlers, &remaining);
> - if (ret != -ENOATTR)
> - break;
> - }
> - return ret ? ret : it->buffer_ofs;
> -}
> -
> -static int shared_getxattr(struct inode *inode, struct erofs_xattr_iter *it)
> -{
> - struct erofs_inode *const vi = EROFS_I(inode);
> - struct super_block *const sb = it->sb;
> - unsigned int i, xsid;
> - int ret = -ENOATTR;
> -
> - for (i = 0; i < vi->xattr_shared_count; ++i) {
> - xsid = vi->xattr_shared_xattrs[i];
> - it->pos = erofs_pos(sb, EROFS_SB(sb)->xattr_blkaddr) +
> - xsid * sizeof(__u32);
> - it->kaddr = erofs_bread(&it->buf, erofs_blknr(sb, it->pos),
> - EROFS_KMAP);
> - if (IS_ERR(it->kaddr))
> - return PTR_ERR(it->kaddr);
> -
> - ret = xattr_foreach(it, &find_xattr_handlers, NULL);
> - if (ret != -ENOATTR)
> - break;
> - }
> - return ret ? ret : it->buffer_ofs;
> -}
> -
> static bool erofs_xattr_user_list(struct dentry *dentry)
> {
> return test_opt(&EROFS_SB(dentry->d_sb)->opt, XATTR_USER);
> @@ -384,39 +322,6 @@ static bool erofs_xattr_trusted_list(struct dentry *dentry)
> return capable(CAP_SYS_ADMIN);
> }
>
> -int erofs_getxattr(struct inode *inode, int index,
> - const char *name,
> - void *buffer, size_t buffer_size)
> -{
> - int ret;
> - struct erofs_xattr_iter it;
> -
> - if (!name)
> - return -EINVAL;
> -
> - ret = erofs_init_inode_xattrs(inode);
> - if (ret)
> - return ret;
> -
> - it.index = index;
> - it.name = (struct qstr)QSTR_INIT(name, strlen(name));
> - if (it.name.len > EROFS_NAME_LEN)
> - return -ERANGE;
> -
> - it.sb = inode->i_sb;
> - it.buf = __EROFS_BUF_INITIALIZER;
> - erofs_init_metabuf(&it.buf, it.sb);
> - it.buffer = buffer;
> - it.buffer_size = buffer_size;
> - it.buffer_ofs = 0;
> -
> - ret = inline_getxattr(inode, &it);
> - if (ret == -ENOATTR)
> - ret = shared_getxattr(inode, &it);
> - erofs_put_metabuf(&it.buf);
> - return ret;
> -}
> -
> static int erofs_xattr_generic_get(const struct xattr_handler *handler,
> struct dentry *unused, struct inode *inode,
> const char *name, void *buffer, size_t size)
> @@ -521,31 +426,48 @@ static const struct xattr_iter_handlers list_xattr_handlers = {
> .value = NULL
> };
>
> -static int inline_listxattr(struct erofs_xattr_iter *it)
> +static int erofs_iter_inline_xattr(struct erofs_xattr_iter *it,
> + struct inode *inode, bool getxattr)
> {
> + struct erofs_inode *const vi = EROFS_I(inode);
> + const struct xattr_iter_handlers *op;
> + unsigned int xattr_header_sz, remaining;
> int ret;
> - unsigned int remaining;
>
> - ret = inline_xattr_iter_begin(it, d_inode(it->dentry));
> - if (ret < 0)
> - return ret;
> + xattr_header_sz = sizeof(struct erofs_xattr_ibody_header) +
> + sizeof(u32) * vi->xattr_shared_count;
> + if (xattr_header_sz >= vi->xattr_isize) {
> + DBG_BUGON(xattr_header_sz > vi->xattr_isize);
> + return -ENOATTR;
> + }
> +
> + it->pos = erofs_iloc(inode) + vi->inode_isize + xattr_header_sz;
> + it->kaddr = erofs_bread(&it->buf, erofs_blknr(it->sb, it->pos),
> + EROFS_KMAP);
> + if (IS_ERR(it->kaddr))
> + return PTR_ERR(it->kaddr);
> +
> + remaining = vi->xattr_isize - xattr_header_sz;
> + op = getxattr ? &find_xattr_handlers : &list_xattr_handlers;
>
> - remaining = ret;
> while (remaining) {
> - ret = xattr_foreach(it, &list_xattr_handlers, &remaining);
> - if (ret)
> + ret = xattr_foreach(it, op, &remaining);
> + if ((getxattr && ret != -ENOATTR) || (!getxattr && ret))
> break;
> }
> - return ret ? ret : it->buffer_ofs;
> + return ret;
> }
>
> -static int shared_listxattr(struct erofs_xattr_iter *it)
> +static int erofs_iter_shared_xattr(struct erofs_xattr_iter *it,
> + struct inode *inode, bool getxattr)
> {
> - struct inode *const inode = d_inode(it->dentry);
> struct erofs_inode *const vi = EROFS_I(inode);
> struct super_block *const sb = it->sb;
> + const struct xattr_iter_handlers *op;
> unsigned int i, xsid;
> - int ret = 0;
> + int ret = -ENOATTR;
> +
> + op = getxattr ? &find_xattr_handlers : &list_xattr_handlers;
>
> for (i = 0; i < vi->xattr_shared_count; ++i) {
> xsid = vi->xattr_shared_xattrs[i];
> @@ -556,11 +478,44 @@ static int shared_listxattr(struct erofs_xattr_iter *it)
> if (IS_ERR(it->kaddr))
> return PTR_ERR(it->kaddr);
>
> - ret = xattr_foreach(it, &list_xattr_handlers, NULL);
> - if (ret)
> + ret = xattr_foreach(it, op, NULL);
> + if ((getxattr && ret != -ENOATTR) || (!getxattr && ret))
> break;
> }
> - return ret ? ret : it->buffer_ofs;
> + return ret;
> +}
> +
> +int erofs_getxattr(struct inode *inode, int index,
> + const char *name,
> + void *buffer, size_t buffer_size)
> +{
> + int ret;
> + struct erofs_xattr_iter it;
> +
> + if (!name)
> + return -EINVAL;
> +
> + ret = erofs_init_inode_xattrs(inode);
> + if (ret)
> + return ret;
> +
> + it.index = index;
> + it.name = (struct qstr)QSTR_INIT(name, strlen(name));
> + if (it.name.len > EROFS_NAME_LEN)
> + return -ERANGE;
> +
> + it.sb = inode->i_sb;
> + it.buf = __EROFS_BUF_INITIALIZER;
> + erofs_init_metabuf(&it.buf, it.sb);
> + it.buffer = buffer;
> + it.buffer_size = buffer_size;
> + it.buffer_ofs = 0;
> +
> + ret = erofs_iter_inline_xattr(&it, inode, true);
> + if (ret == -ENOATTR)
> + ret = erofs_iter_shared_xattr(&it, inode, true);
> + erofs_put_metabuf(&it.buf);
> + return ret ? ret : it.buffer_ofs;
> }
>
> ssize_t erofs_listxattr(struct dentry *dentry,
> @@ -568,8 +523,9 @@ ssize_t erofs_listxattr(struct dentry *dentry,
> {
> int ret;
> struct erofs_xattr_iter it;
> + struct inode *inode = d_inode(dentry);
>
> - ret = erofs_init_inode_xattrs(d_inode(dentry));
> + ret = erofs_init_inode_xattrs(inode);
> if (ret == -ENOATTR)
> return 0;
> if (ret)
> @@ -583,11 +539,13 @@ ssize_t erofs_listxattr(struct dentry *dentry,
> it.buffer_size = buffer_size;
> it.buffer_ofs = 0;
>
> - ret = inline_listxattr(&it);
> - if (ret >= 0 || ret == -ENOATTR)
> - ret = shared_listxattr(&it);
> + ret = erofs_iter_inline_xattr(&it, inode, false);
> + if (!ret || ret == -ENOATTR)
> + ret = erofs_iter_shared_xattr(&it, inode, false);
> + if (ret == -ENOATTR)
> + ret = 0;
> erofs_put_metabuf(&it.buf);
> - return ret;
> + return ret ? ret : it.buffer_ofs;
> }
>
> void erofs_xattr_prefixes_cleanup(struct super_block *sb)
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