[PATCH v3 06/24] erofs: support special inode

Gao Xiang
2019-07-22T02:52:53Z

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

Signed-off-by: Gao Xiang <gaoxiang25@huawei.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 79ef5b38dfa3..5a95cd076fcc 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