linux-kernel - [PATCH v5 06/24] erofs: support special inode

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Date:   Tue, 30 Jul 2019 15:13:55 +0800
From:   Gao Xiang <gaoxiang25@...wei.com>
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Theodore Ts'o <tytso@....edu>,
        "David Sterba" <dsterba@...e.cz>,
        Amir Goldstein <amir73il@...il.com>,
        "Christoph Hellwig" <hch@...radead.org>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Dave Chinner <david@...morbit.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>, "Jan Kara" <jack@...e.cz>,
        Linus Torvalds <torvalds@...ux-foundation.org>
CC:     <linux-fsdevel@...r.kernel.org>, <devel@...verdev.osuosl.org>,
        LKML <linux-kernel@...r.kernel.org>,
        <linux-erofs@...ts.ozlabs.org>, Chao Yu <yuchao0@...wei.com>,
        Miao Xie <miaoxie@...wei.com>,
        Li Guifu <bluce.liguifu@...wei.com>,
        Fang Wei <fangwei1@...wei.com>,
        Gao Xiang <gaoxiang25@...wei.com>
Subject: [PATCH v5 06/24] erofs: support special inode

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

Signed-off-by: Gao Xiang <gaoxiang25@...wei.com>
---
 fs/erofs/inode.c | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
index b6ea997bc4ae..637bf6e4de44 100644
--- a/fs/erofs/inode.c
+++ b/fs/erofs/inode.c
@@ -34,7 +34,16 @@ static int read_inode(struct inode *inode, void *data)
 		vi->xattr_isize = ondisk_xattr_ibody_size(v2->i_xattr_icount);
 
 		inode->i_mode = le16_to_cpu(v2->i_mode);
-		vi->raw_blkaddr = le32_to_cpu(v2->i_u.raw_blkaddr);
+		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));
@@ -58,7 +67,16 @@ static int read_inode(struct inode *inode, void *data)
 		vi->xattr_isize = ondisk_xattr_ibody_size(v1->i_xattr_icount);
 
 		inode->i_mode = le16_to_cpu(v1->i_mode);
-		vi->raw_blkaddr = le32_to_cpu(v1->i_u.raw_blkaddr);
+		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));
@@ -176,6 +194,11 @@ static int fill_inode(struct inode *inode, int isdir)
 			/* by default, page_get_link is used for symlink */
 			inode->i_op = &erofs_symlink_iops;
 			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)) {
+			inode->i_op = &erofs_generic_iops;
+			init_special_inode(inode, inode->i_mode, inode->i_rdev);
+			goto out_unlock;
 		} else {
 			err = -EIO;
 			goto out_unlock;
-- 
2.17.1