staging: erofs: support special inode

This patch adds to support special inode, such as block dev, char,
socket, pipe inode.

Reviewed-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
index 15ed919..c011811 100644 (file)
--- a/drivers/staging/erofs/inode.c
+++ b/drivers/staging/erofs/inode.c
@@ -34,8 +34,18 @@ static int read_inode(struct inode *inode, void *data)
                vi->inode_isize = sizeof(struct erofs_inode_v2);
                vi->xattr_isize = ondisk_xattr_ibody_size(v2->i_xattr_icount);
 
-               vi->raw_blkaddr = le32_to_cpu(v2->i_u.raw_blkaddr);
                inode->i_mode = le16_to_cpu(v2->i_mode);
+               if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
+                                               S_ISLNK(inode->i_mode)) {
+                       vi->raw_blkaddr = le32_to_cpu(v2->i_u.raw_blkaddr);
+               } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
+                       inode->i_rdev =
+                               new_decode_dev(le32_to_cpu(v2->i_u.rdev));
+               } else if (S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
+                       inode->i_rdev = 0;
+               } else {
+                       return -EIO;
+               }
 
                i_uid_write(inode, le32_to_cpu(v2->i_uid));
                i_gid_write(inode, le32_to_cpu(v2->i_gid));
@@ -54,8 +64,18 @@ static int read_inode(struct inode *inode, void *data)
                vi->inode_isize = sizeof(struct erofs_inode_v1);
                vi->xattr_isize = ondisk_xattr_ibody_size(v1->i_xattr_icount);
 
-               vi->raw_blkaddr = le32_to_cpu(v1->i_u.raw_blkaddr);
                inode->i_mode = le16_to_cpu(v1->i_mode);
+               if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
+                                               S_ISLNK(inode->i_mode)) {
+                       vi->raw_blkaddr = le32_to_cpu(v1->i_u.raw_blkaddr);
+               } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
+                       inode->i_rdev =
+                               new_decode_dev(le32_to_cpu(v1->i_u.rdev));
+               } else if (S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
+                       inode->i_rdev = 0;
+               } else {
+                       return -EIO;
+               }
 
                i_uid_write(inode, le16_to_cpu(v1->i_uid));
                i_gid_write(inode, le16_to_cpu(v1->i_gid));
@@ -173,6 +193,12 @@ static int fill_inode(struct inode *inode, int isdir)
                                &page_symlink_inode_operations;
 #endif
                        inode_nohighmem(inode);
+               } else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
+                       S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
+#ifdef CONFIG_EROFS_FS_XATTR
+                       inode->i_op = &erofs_special_inode_operations;
+#endif
+                       init_special_inode(inode, inode->i_mode, inode->i_rdev);
                } else {
                        err = -EIO;
                        goto out_unlock;
@@ -232,6 +258,12 @@ const struct inode_operations erofs_symlink_xattr_iops = {
 };
 #endif
 
+const struct inode_operations erofs_special_inode_operations = {
+#ifdef CONFIG_EROFS_FS_XATTR
+       .listxattr = erofs_listxattr,
+#endif
+};
+
 #ifdef CONFIG_EROFS_FS_XATTR
 const struct inode_operations erofs_fast_symlink_xattr_iops = {
        .get_link = simple_get_link,

diff --git a/drivers/staging/erofs/internal.h b/drivers/staging/erofs/internal.h
index 8a8caf0..5862705 100644 (file)
--- a/drivers/staging/erofs/internal.h
+++ b/drivers/staging/erofs/internal.h
@@ -252,6 +252,7 @@ extern const struct xattr_handler *erofs_xattr_handlers[];
 #ifdef CONFIG_EROFS_FS_XATTR
 extern const struct inode_operations erofs_symlink_xattr_iops;
 extern const struct inode_operations erofs_fast_symlink_xattr_iops;
+extern const struct inode_operations erofs_special_inode_operations;
 #endif
 
 static inline void set_inode_fast_symlink(struct inode *inode)