From: Zhihao Cheng chengzhihao1@huawei.com
mainline inclusion from mainline-v5.14 commit 819f9ab430a4478ce519e5cc8ae4de438d8ad4ba category: bugfix bugzilla: 173879 https://gitee.com/openeuler/kernel/issues/I4DDEL
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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Since ubifs_xattr_get and ubifs_xattr_set cannot being executed parallelly after importing @host_ui->xattr_sem, now we can remove ui_mutex imported by commit ab92a20bce3b4c2 ("ubifs: make ubifs_[get|set]xattr atomic").
@xattr_size, @xattr_names and @xattr_cnt can't be out of protection by @host_ui->mutex yet, they are sill accesed in other places, such as pack_inode() called by ubifs_write_inode() triggered by page-writeback.
Signed-off-by: Zhihao Cheng chengzhihao1@huawei.com Signed-off-by: Richard Weinberger richard@nod.at Reviewed-by: Zhang Yi yi.zhang@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com --- fs/ubifs/xattr.c | 4 ---- 1 file changed, 4 deletions(-)
diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c index 09280796fc61..905eddf90345 100644 --- a/fs/ubifs/xattr.c +++ b/fs/ubifs/xattr.c @@ -208,13 +208,11 @@ static int change_xattr(struct ubifs_info *c, struct inode *host, err = -ENOMEM; goto out_free; } - mutex_lock(&ui->ui_mutex); kfree(ui->data); ui->data = buf; inode->i_size = ui->ui_size = size; old_size = ui->data_len; ui->data_len = size; - mutex_unlock(&ui->ui_mutex);
mutex_lock(&host_ui->ui_mutex); host->i_ctime = current_time(host); @@ -362,7 +360,6 @@ ssize_t ubifs_xattr_get(struct inode *host, const char *name, void *buf, ubifs_assert(c, inode->i_size == ui->data_len); ubifs_assert(c, ubifs_inode(host)->xattr_size > ui->data_len);
- mutex_lock(&ui->ui_mutex); if (buf) { /* If @buf is %NULL we are supposed to return the length */ if (ui->data_len > size) { @@ -375,7 +372,6 @@ ssize_t ubifs_xattr_get(struct inode *host, const char *name, void *buf, err = ui->data_len;
out_iput: - mutex_unlock(&ui->ui_mutex); iput(inode); out_cleanup: up_read(&ubifs_inode(host)->xattr_sem);