[PATCH 10/25] staging: erofs: support special inode

Gao Xiang
2018-07-26T12:25:44Z

From: Chao Yu <yuchao0@huawei.com>

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>
---
drivers/staging/erofs/inode.c | 36 ++++++++++++++++++++++++++++++++++--
drivers/staging/erofs/internal.h | 1 +
2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
index 15ed919..c011811 100644
--- 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 @@ struct inode *erofs_iget(struct super_block *sb,
};
#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
--- a/drivers/staging/erofs/internal.h
+++ b/drivers/staging/erofs/internal.h
@@ -252,6 +252,7 @@ int erofs_namei(struct inode *dir, struct qstr *name,
#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)
--
1.9.1