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Subject[PATCH 3/5] staging: erofs: remove unneeded inode_operations
Date
Currently, EROFS uses generic iops when xattr is off,
it seems unnecessary and a lot of extra code is there.
Let's follow what other filesystems do instead.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
---
drivers/staging/erofs/inode.c | 38 ++++++++++++------------------------
drivers/staging/erofs/internal.h | 42 +++++++++++++++++-----------------------
drivers/staging/erofs/namei.c | 4 ----
drivers/staging/erofs/xattr.h | 4 ----
4 files changed, 30 insertions(+), 58 deletions(-)

diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
index f99954dbfdb5..4f04f7c38cf2 100644
--- a/drivers/staging/erofs/inode.c
+++ b/drivers/staging/erofs/inode.c
@@ -184,32 +184,18 @@ static int fill_inode(struct inode *inode, int isdir)
if (!err) {
/* setup the new inode */
if (S_ISREG(inode->i_mode)) {
-#ifdef CONFIG_EROFS_FS_XATTR
- inode->i_op = &erofs_generic_xattr_iops;
-#endif
+ inode->i_op = &erofs_generic_iops;
inode->i_fop = &generic_ro_fops;
} else if (S_ISDIR(inode->i_mode)) {
- inode->i_op =
-#ifdef CONFIG_EROFS_FS_XATTR
- &erofs_dir_xattr_iops;
-#else
- &erofs_dir_iops;
-#endif
+ inode->i_op = &erofs_dir_iops;
inode->i_fop = &erofs_dir_fops;
} else if (S_ISLNK(inode->i_mode)) {
/* by default, page_get_link is used for symlink */
- inode->i_op =
-#ifdef CONFIG_EROFS_FS_XATTR
- &erofs_symlink_xattr_iops,
-#else
- &page_symlink_inode_operations;
-#endif
+ 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)) {
-#ifdef CONFIG_EROFS_FS_XATTR
- inode->i_op = &erofs_special_inode_operations;
-#endif
+ inode->i_op = &erofs_generic_iops;
init_special_inode(inode, inode->i_mode, inode->i_rdev);
} else {
err = -EIO;
@@ -297,23 +283,23 @@ struct inode *erofs_iget(struct super_block *sb,
return inode;
}

+const struct inode_operations erofs_generic_iops = {
#ifdef CONFIG_EROFS_FS_XATTR
-const struct inode_operations erofs_generic_xattr_iops = {
.listxattr = erofs_listxattr,
+#endif
};

-const struct inode_operations erofs_symlink_xattr_iops = {
+const struct inode_operations erofs_symlink_iops = {
.get_link = page_get_link,
+#ifdef CONFIG_EROFS_FS_XATTR
.listxattr = erofs_listxattr,
+#endif
};

-const struct inode_operations erofs_special_inode_operations = {
- .listxattr = erofs_listxattr,
-};
-
-const struct inode_operations erofs_fast_symlink_xattr_iops = {
+const struct inode_operations erofs_fast_symlink_iops = {
.get_link = simple_get_link,
+#ifdef CONFIG_EROFS_FS_XATTR
.listxattr = erofs_listxattr,
-};
#endif
+};

diff --git a/drivers/staging/erofs/internal.h b/drivers/staging/erofs/internal.h
index 192f4028d85d..ae4f2555f497 100644
--- a/drivers/staging/erofs/internal.h
+++ b/drivers/staging/erofs/internal.h
@@ -414,8 +414,6 @@ static inline bool is_inode_layout_inline(struct inode *inode)
}

extern const struct super_operations erofs_sops;
-extern const struct inode_operations erofs_dir_iops;
-extern const struct file_operations erofs_dir_fops;

extern const struct address_space_operations erofs_raw_access_aops;
#ifdef CONFIG_EROFS_FS_ZIP
@@ -559,37 +557,33 @@ static inline unsigned long erofs_inode_hash(erofs_nid_t nid)
extern struct inode *erofs_iget(struct super_block *sb,
erofs_nid_t nid, bool dir);

-/* dir.c */
-int erofs_namei(struct inode *dir, struct qstr *name,
- erofs_nid_t *nid, unsigned *d_type);
-
-#ifdef CONFIG_EROFS_FS_XATTR
-/* xattr.c */
-extern const struct xattr_handler *erofs_xattr_handlers[];
-
-/* symlink and special inode */
-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
+extern const struct inode_operations erofs_generic_iops;
+extern const struct inode_operations erofs_symlink_iops;
+extern const struct inode_operations erofs_fast_symlink_iops;

static inline void set_inode_fast_symlink(struct inode *inode)
{
-#ifdef CONFIG_EROFS_FS_XATTR
- inode->i_op = &erofs_fast_symlink_xattr_iops;
-#else
- inode->i_op = &simple_symlink_inode_operations;
-#endif
+ inode->i_op = &erofs_fast_symlink_iops;
}

static inline bool is_inode_fast_symlink(struct inode *inode)
{
+ return inode->i_op == &erofs_fast_symlink_iops;
+}
+
+/* namei.c */
+extern const struct inode_operations erofs_dir_iops;
+
+int erofs_namei(struct inode *dir, struct qstr *name,
+ erofs_nid_t *nid, unsigned int *d_type);
+
+/* dir.c */
+extern const struct file_operations erofs_dir_fops;
+
#ifdef CONFIG_EROFS_FS_XATTR
- return inode->i_op == &erofs_fast_symlink_xattr_iops;
-#else
- return inode->i_op == &simple_symlink_inode_operations;
+/* xattr.c */
+extern const struct xattr_handler *erofs_xattr_handlers[];
#endif
-}

static inline void *erofs_vmap(struct page **pages, unsigned int count)
{
diff --git a/drivers/staging/erofs/namei.c b/drivers/staging/erofs/namei.c
index 5596c52e246d..7fed1f996ab0 100644
--- a/drivers/staging/erofs/namei.c
+++ b/drivers/staging/erofs/namei.c
@@ -235,10 +235,6 @@ static struct dentry *erofs_lookup(struct inode *dir,

const struct inode_operations erofs_dir_iops = {
.lookup = erofs_lookup,
-};
-
-const struct inode_operations erofs_dir_xattr_iops = {
- .lookup = erofs_lookup,
#ifdef CONFIG_EROFS_FS_XATTR
.listxattr = erofs_listxattr,
#endif
diff --git a/drivers/staging/erofs/xattr.h b/drivers/staging/erofs/xattr.h
index 0c7379282fc5..810fc947701d 100644
--- a/drivers/staging/erofs/xattr.h
+++ b/drivers/staging/erofs/xattr.h
@@ -68,10 +68,6 @@ static const struct xattr_handler *xattr_handler_map[] = {
}

#ifdef CONFIG_EROFS_FS_XATTR
-
-extern const struct inode_operations erofs_generic_xattr_iops;
-extern const struct inode_operations erofs_dir_xattr_iops;
-
int erofs_getxattr(struct inode *, int, const char *, void *, size_t);
ssize_t erofs_listxattr(struct dentry *, char *, size_t);
#else
--
2.14.4
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