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Message-ID: <7a466054-2e52-b04c-2490-ea2b509ad350@linux.alibaba.com>
Date: Tue, 30 May 2023 11:55:37 +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 v3 2/5] erofs: unify xattr_iter structures
On 2023/5/18 10:45, Jingbo Xu wrote:
> Unify xattr_iter/listxattr_iter/getxattr_iter structures into
> erofs_xattr_iter structure.
>
> This is in preparation for the following further cleanup.
>
> Signed-off-by: Jingbo Xu <jefflexu@...ux.alibaba.com>
> ---
> fs/erofs/xattr.c | 172 ++++++++++++++++++++---------------------------
> 1 file changed, 72 insertions(+), 100 deletions(-)
>
> diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
> index b79be2a556ba..1e44aa108134 100644
> --- a/fs/erofs/xattr.c
> +++ b/fs/erofs/xattr.c
> @@ -20,16 +20,22 @@ static inline unsigned int erofs_xattr_blkoff(struct super_block *sb,
> return erofs_blkoff(sb, xattr_id * sizeof(__u32));
> }
>
> -struct xattr_iter {
> +struct erofs_xattr_iter {
> struct super_block *sb;
> struct erofs_buf buf;
> void *kaddr;
> -
> erofs_blk_t blkaddr;
> unsigned int ofs;
> +
> + char *buffer;
> + int buffer_size, buffer_ofs;
> +
> + int index, infix_len;
> + struct qstr name;
> + struct dentry *dentry;
> };
>
> -static inline int erofs_xattr_iter_fixup(struct xattr_iter *it)
> +static inline int erofs_xattr_iter_fixup(struct erofs_xattr_iter *it)
> {
> if (it->ofs < it->sb->s_blocksize)
> return 0;
> @@ -42,7 +48,7 @@ static inline int erofs_xattr_iter_fixup(struct xattr_iter *it)
> return 0;
> }
>
> -static inline int erofs_xattr_iter_fixup_aligned(struct xattr_iter *it)
> +static inline int erofs_xattr_iter_fixup_aligned(struct erofs_xattr_iter *it)
> {
> if (it->ofs > it->sb->s_blocksize) {
> DBG_BUGON(1);
> @@ -54,7 +60,7 @@ static inline int erofs_xattr_iter_fixup_aligned(struct xattr_iter *it)
> static int erofs_init_inode_xattrs(struct inode *inode)
> {
> struct erofs_inode *const vi = EROFS_I(inode);
> - struct xattr_iter it;
> + struct erofs_xattr_iter it;
> unsigned int i;
> struct erofs_xattr_ibody_header *ih;
> struct super_block *sb = inode->i_sb;
> @@ -157,15 +163,15 @@ static int erofs_init_inode_xattrs(struct inode *inode)
> * and need to be handled
> */
> struct xattr_iter_handlers {
> - int (*entry)(struct xattr_iter *_it, struct erofs_xattr_entry *entry);
> - int (*name)(struct xattr_iter *_it, unsigned int processed, char *buf,
> + int (*entry)(struct erofs_xattr_iter *it, struct erofs_xattr_entry *entry);
> + int (*name)(struct erofs_xattr_iter *it, unsigned int processed, char *buf,
> unsigned int len);
> - int (*alloc_buffer)(struct xattr_iter *_it, unsigned int value_sz);
> - void (*value)(struct xattr_iter *_it, unsigned int processed, char *buf,
> + int (*alloc_buffer)(struct erofs_xattr_iter *it, unsigned int value_sz);
> + void (*value)(struct erofs_xattr_iter *it, unsigned int processed, char *buf,
> unsigned int len);
> };
>
> -static int inline_xattr_iter_begin(struct xattr_iter *it,
> +static int inline_xattr_iter_begin(struct erofs_xattr_iter *it,
> struct inode *inode)
> {
> struct erofs_inode *const vi = EROFS_I(inode);
> @@ -193,7 +199,7 @@ static int inline_xattr_iter_begin(struct xattr_iter *it,
> * Regardless of success or failure, `xattr_foreach' will end up with
> * `ofs' pointing to the next xattr item rather than an arbitrary position.
> */
> -static int xattr_foreach(struct xattr_iter *it,
> +static int xattr_foreach(struct erofs_xattr_iter *it,
> const struct xattr_iter_handlers *op,
> unsigned int *tlimit)
> {
> @@ -284,18 +290,10 @@ static int xattr_foreach(struct xattr_iter *it,
> return err < 0 ? err : 0;
> }
>
> -struct getxattr_iter {
> - struct xattr_iter it;
> -
> - char *buffer;
> - int buffer_size, index, infix_len;
> - struct qstr name;
> -};
> -
> -static int erofs_xattr_long_entrymatch(struct getxattr_iter *it,
> +static int erofs_xattr_long_entrymatch(struct erofs_xattr_iter *it,
> struct erofs_xattr_entry *entry)
> {
> - struct erofs_sb_info *sbi = EROFS_SB(it->it.sb);
> + struct erofs_sb_info *sbi = EROFS_SB(it->sb);
> struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes +
> (entry->e_name_index & EROFS_XATTR_LONG_PREFIX_MASK);
>
> @@ -313,11 +311,9 @@ static int erofs_xattr_long_entrymatch(struct getxattr_iter *it,
> return 0;
> }
>
> -static int xattr_entrymatch(struct xattr_iter *_it,
> +static int xattr_entrymatch(struct erofs_xattr_iter *it,
> struct erofs_xattr_entry *entry)
> {
> - struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
> -
> /* should also match the infix for long name prefixes */
> if (entry->e_name_index & EROFS_XATTR_LONG_PREFIX)
> return erofs_xattr_long_entrymatch(it, entry);
> @@ -329,32 +325,27 @@ static int xattr_entrymatch(struct xattr_iter *_it,
> return 0;
> }
>
> -static int xattr_namematch(struct xattr_iter *_it,
> +static int xattr_namematch(struct erofs_xattr_iter *it,
> unsigned int processed, char *buf, unsigned int len)
> {
> - struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
> -
> if (memcmp(buf, it->name.name + it->infix_len + processed, len))
> return -ENOATTR;
> return 0;
> }
>
> -static int xattr_checkbuffer(struct xattr_iter *_it,
> +static int xattr_checkbuffer(struct erofs_xattr_iter *it,
> unsigned int value_sz)
> {
> - struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
> int err = it->buffer_size < value_sz ? -ERANGE : 0;
>
> it->buffer_size = value_sz;
> return !it->buffer ? 1 : err;
> }
>
> -static void xattr_copyvalue(struct xattr_iter *_it,
> +static void xattr_copyvalue(struct erofs_xattr_iter *it,
> unsigned int processed,
> char *buf, unsigned int len)
> {
> - struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
> -
> memcpy(it->buffer + processed, buf, len);
> }
>
> @@ -365,41 +356,40 @@ static const struct xattr_iter_handlers find_xattr_handlers = {
> .value = xattr_copyvalue
> };
>
> -static int inline_getxattr(struct inode *inode, struct getxattr_iter *it)
> +static int inline_getxattr(struct inode *inode, struct erofs_xattr_iter *it)
> {
> int ret;
> unsigned int remaining;
>
> - ret = inline_xattr_iter_begin(&it->it, inode);
> + ret = inline_xattr_iter_begin(it, inode);
> if (ret < 0)
> return ret;
>
> remaining = ret;
> while (remaining) {
> - ret = xattr_foreach(&it->it, &find_xattr_handlers, &remaining);
> + ret = xattr_foreach(it, &find_xattr_handlers, &remaining);
> if (ret != -ENOATTR)
> break;
> }
> return ret ? ret : it->buffer_size;
> }
>
> -static int shared_getxattr(struct inode *inode, struct getxattr_iter *it)
> +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->it.sb;
> + 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->it.blkaddr = erofs_xattr_blkaddr(sb, xsid);
> - it->it.ofs = erofs_xattr_blkoff(sb, xsid);
> - it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb,
> - it->it.blkaddr, EROFS_KMAP);
> - if (IS_ERR(it->it.kaddr))
> - return PTR_ERR(it->it.kaddr);
> -
> - ret = xattr_foreach(&it->it, &find_xattr_handlers, NULL);
> + it->blkaddr = erofs_xattr_blkaddr(sb, xsid);
> + it->ofs = erofs_xattr_blkoff(sb, xsid);
> + it->kaddr = erofs_read_metabuf(&it->buf, sb, it->blkaddr, EROFS_KMAP);
> + if (IS_ERR(it->kaddr))
> + return PTR_ERR(it->kaddr);
> +
> + ret = xattr_foreach(it, &find_xattr_handlers, NULL);
> if (ret != -ENOATTR)
> break;
> }
> @@ -421,31 +411,30 @@ int erofs_getxattr(struct inode *inode, int index,
> void *buffer, size_t buffer_size)
> {
> int ret;
> - struct getxattr_iter it;
> + struct erofs_xattr_iter it;
>
> if (!name)
> return -EINVAL;
> + if (strlen(name) > EROFS_NAME_LEN)
> + return -ERANGE;
duplicated calculation.
>
> ret = erofs_init_inode_xattrs(inode);
> if (ret)
> return ret;
>
> - it.index = index;
> - it.name.len = strlen(name);
> - if (it.name.len > EROFS_NAME_LEN)
> - return -ERANGE;
> -
> - it.it.buf = __EROFS_BUF_INITIALIZER;
> - it.name.name = name;
> -
> - it.buffer = buffer;
> - it.buffer_size = buffer_size;
> + it = (struct erofs_xattr_iter) {
> + .buf = __EROFS_BUF_INITIALIZER,
> + .sb = inode->i_sb,
> + .name = QSTR_INIT(name, strlen(name)),
> + .index = index,
> + .buffer = buffer,
> + .buffer_size = buffer_size,
> + };
No need to zero out the other fields like this?
>
> - it.it.sb = inode->i_sb;
> ret = inline_getxattr(inode, &it);
> if (ret == -ENOATTR)
> ret = shared_getxattr(inode, &it);
> - erofs_put_metabuf(&it.it.buf);
> + erofs_put_metabuf(&it.buf);
> return ret;
> }
>
> @@ -491,25 +480,15 @@ const struct xattr_handler *erofs_xattr_handlers[] = {
> NULL,
> };
>
> -struct listxattr_iter {
> - struct xattr_iter it;
> -
> - struct dentry *dentry;
> - char *buffer;
> - int buffer_size, buffer_ofs;
> -};
> -
> -static int xattr_entrylist(struct xattr_iter *_it,
> +static int xattr_entrylist(struct erofs_xattr_iter *it,
> struct erofs_xattr_entry *entry)
> {
> - struct listxattr_iter *it =
> - container_of(_it, struct listxattr_iter, it);
> unsigned int base_index = entry->e_name_index;
> unsigned int prefix_len, infix_len = 0;
> const char *prefix, *infix = NULL;
>
> if (entry->e_name_index & EROFS_XATTR_LONG_PREFIX) {
> - struct erofs_sb_info *sbi = EROFS_SB(_it->sb);
> + struct erofs_sb_info *sbi = EROFS_SB(it->sb);
> struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes +
> (entry->e_name_index & EROFS_XATTR_LONG_PREFIX_MASK);
>
> @@ -541,23 +520,17 @@ static int xattr_entrylist(struct xattr_iter *_it,
> return 0;
> }
>
> -static int xattr_namelist(struct xattr_iter *_it,
> +static int xattr_namelist(struct erofs_xattr_iter *it,
> unsigned int processed, char *buf, unsigned int len)
> {
> - struct listxattr_iter *it =
> - container_of(_it, struct listxattr_iter, it);
> -
> memcpy(it->buffer + it->buffer_ofs, buf, len);
> it->buffer_ofs += len;
> return 0;
> }
>
> -static int xattr_skipvalue(struct xattr_iter *_it,
> +static int xattr_skipvalue(struct erofs_xattr_iter *it,
> unsigned int value_sz)
> {
> - struct listxattr_iter *it =
> - container_of(_it, struct listxattr_iter, it);
> -
> it->buffer[it->buffer_ofs++] = '\0';
> return 1;
> }
> @@ -569,42 +542,41 @@ static const struct xattr_iter_handlers list_xattr_handlers = {
> .value = NULL
> };
>
> -static int inline_listxattr(struct listxattr_iter *it)
> +static int inline_listxattr(struct erofs_xattr_iter *it)
> {
> int ret;
> unsigned int remaining;
>
> - ret = inline_xattr_iter_begin(&it->it, d_inode(it->dentry));
> + ret = inline_xattr_iter_begin(it, d_inode(it->dentry));
> if (ret < 0)
> return ret;
>
> remaining = ret;
> while (remaining) {
> - ret = xattr_foreach(&it->it, &list_xattr_handlers, &remaining);
> + ret = xattr_foreach(it, &list_xattr_handlers, &remaining);
> if (ret)
> break;
> }
> return ret ? ret : it->buffer_ofs;
> }
>
> -static int shared_listxattr(struct listxattr_iter *it)
> +static int shared_listxattr(struct erofs_xattr_iter *it)
> {
> struct inode *const inode = d_inode(it->dentry);
> struct erofs_inode *const vi = EROFS_I(inode);
> - struct super_block *const sb = it->it.sb;
> + struct super_block *const sb = it->sb;
> unsigned int i, xsid;
> int ret = 0;
>
> for (i = 0; i < vi->xattr_shared_count; ++i) {
> xsid = vi->xattr_shared_xattrs[i];
> - it->it.blkaddr = erofs_xattr_blkaddr(sb, xsid);
> - it->it.ofs = erofs_xattr_blkoff(sb, xsid);
> - it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb,
> - it->it.blkaddr, EROFS_KMAP);
> - if (IS_ERR(it->it.kaddr))
> - return PTR_ERR(it->it.kaddr);
> -
> - ret = xattr_foreach(&it->it, &list_xattr_handlers, NULL);
> + it->blkaddr = erofs_xattr_blkaddr(sb, xsid);
> + it->ofs = erofs_xattr_blkoff(sb, xsid);
> + it->kaddr = erofs_read_metabuf(&it->buf, sb, it->blkaddr, EROFS_KMAP);
> + if (IS_ERR(it->kaddr))
> + return PTR_ERR(it->kaddr);
> +
> + ret = xattr_foreach(it, &list_xattr_handlers, NULL);
> if (ret)
> break;
> }
> @@ -615,7 +587,7 @@ ssize_t erofs_listxattr(struct dentry *dentry,
> char *buffer, size_t buffer_size)
> {
> int ret;
> - struct listxattr_iter it;
> + struct erofs_xattr_iter it;
>
> ret = erofs_init_inode_xattrs(d_inode(dentry));
> if (ret == -ENOATTR)
> @@ -623,18 +595,18 @@ ssize_t erofs_listxattr(struct dentry *dentry,
> if (ret)
> return ret;
>
> - it.it.buf = __EROFS_BUF_INITIALIZER;
> - it.dentry = dentry;
> - it.buffer = buffer;
> - it.buffer_size = buffer_size;
> - it.buffer_ofs = 0;
> -
> - it.it.sb = dentry->d_sb;
> + it = (struct erofs_xattr_iter) {
> + .buf = __EROFS_BUF_INITIALIZER,
> + .sb = dentry->d_sb,
> + .dentry = dentry,
> + .buffer = buffer,
> + .buffer_size = buffer_size,
> + };
Same here.
Thanks,
Gao Xiang
>
> ret = inline_listxattr(&it);
> if (ret >= 0 || ret == -ENOATTR)
> ret = shared_listxattr(&it);
> - erofs_put_metabuf(&it.it.buf);
> + erofs_put_metabuf(&it.buf);
> return ret;
> }
>
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