vfs: remove externs from fs.h on functions modified by i_ino widening

Christoph says, in response to one of the patches in the i_ino widening
series, which changes the prototype of several functions in fs.h:

    "Can you please drop all these pointless externs while you're at it?"

Remove extern keyword from functions touched by that patch (and a few
that happened to be nearby). Also add missing argument names to
declarations that lacked them.

Suggested-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260307-iino-u64-v2-1-a1a1696e0653@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: jtlayton

include/linux/fs.h

@@ -2912,27 +2912,27 @@ static inline bool name_contains_dotdot(const char *name)
 #include <linux/err.h>
 
 /* needed for stackable file system support */
-extern loff_t default_llseek(struct file *file, loff_t offset, int whence);
+loff_t default_llseek(struct file *file, loff_t offset, int whence);
 
-extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence);
+loff_t vfs_llseek(struct file *file, loff_t offset, int whence);
 
-extern int inode_init_always_gfp(struct super_block *, struct inode *, gfp_t);
+int inode_init_always_gfp(struct super_block *sb, struct inode *inode, gfp_t gfp);
 static inline int inode_init_always(struct super_block *sb, struct inode *inode)
 {
 	return inode_init_always_gfp(sb, inode, GFP_NOFS);
 }
 
-extern void inode_init_once(struct inode *);
-extern void address_space_init_once(struct address_space *mapping);
-extern struct inode * igrab(struct inode *);
-extern ino_t iunique(struct super_block *, ino_t);
-extern int inode_needs_sync(struct inode *inode);
-extern int inode_just_drop(struct inode *inode);
+void inode_init_once(struct inode *inode);
+void address_space_init_once(struct address_space *mapping);
+struct inode *igrab(struct inode *inode);
+ino_t iunique(struct super_block *sb, ino_t max_reserved);
+int inode_needs_sync(struct inode *inode);
+int inode_just_drop(struct inode *inode);
 static inline int inode_generic_drop(struct inode *inode)
 {
 	return !inode->i_nlink || inode_unhashed(inode);
 }
-extern void d_mark_dontcache(struct inode *inode);
+void d_mark_dontcache(struct inode *inode);
 
 struct inode *ilookup5_nowait(struct super_block *sb, u64 hashval,
 			      int (*test)(struct inode *, void *), void *data,
@@ -2944,31 +2944,31 @@ struct inode *ilookup(struct super_block *sb, u64 ino);
 struct inode *inode_insert5(struct inode *inode, u64 hashval,
 			    int (*test)(struct inode *, void *),
 			    int (*set)(struct inode *, void *), void *data);
-struct inode *iget5_locked(struct super_block *, u64,
+struct inode *iget5_locked(struct super_block *sb, u64 hashval,
 			   int (*test)(struct inode *, void *),
-			   int (*set)(struct inode *, void *), void *);
-struct inode *iget5_locked_rcu(struct super_block *, u64,
+			   int (*set)(struct inode *, void *), void *data);
+struct inode *iget5_locked_rcu(struct super_block *sb, u64 hashval,
 			       int (*test)(struct inode *, void *),
-			       int (*set)(struct inode *, void *), void *);
-struct inode *iget_locked(struct super_block *, u64);
-struct inode *find_inode_nowait(struct super_block *, u64,
+			       int (*set)(struct inode *, void *), void *data);
+struct inode *iget_locked(struct super_block *sb, u64 ino);
+struct inode *find_inode_nowait(struct super_block *sb, u64 hashval,
 				int (*match)(struct inode *, u64, void *),
 				void *data);
-struct inode *find_inode_rcu(struct super_block *, u64,
-			     int (*)(struct inode *, void *), void *);
-struct inode *find_inode_by_ino_rcu(struct super_block *, u64);
-int insert_inode_locked4(struct inode *, u64,
-			 int (*test)(struct inode *, void *), void *);
-extern int insert_inode_locked(struct inode *);
+struct inode *find_inode_rcu(struct super_block *sb, u64 hashval,
+			     int (*test)(struct inode *, void *), void *data);
+struct inode *find_inode_by_ino_rcu(struct super_block *sb, u64 ino);
+int insert_inode_locked4(struct inode *inode, u64 hashval,
+			 int (*test)(struct inode *, void *), void *data);
+int insert_inode_locked(struct inode *inode);
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
-extern void lockdep_annotate_inode_mutex_key(struct inode *inode);
+void lockdep_annotate_inode_mutex_key(struct inode *inode);
 #else
 static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { };
 #endif
-extern void unlock_new_inode(struct inode *);
-extern void discard_new_inode(struct inode *);
-extern unsigned int get_next_ino(void);
-extern void evict_inodes(struct super_block *sb);
+void unlock_new_inode(struct inode *inode);
+void discard_new_inode(struct inode *inode);
+unsigned int get_next_ino(void);
+void evict_inodes(struct super_block *sb);
 void dump_mapping(const struct address_space *);
 
 /*
@@ -3013,21 +3013,21 @@ int setattr_should_drop_sgid(struct mnt_idmap *idmap,
  */
 #define alloc_inode_sb(_sb, _cache, _gfp) kmem_cache_alloc_lru(_cache, &_sb->s_inode_lru, _gfp)
 
-void __insert_inode_hash(struct inode *, u64 hashval);
+void __insert_inode_hash(struct inode *inode, u64 hashval);
 static inline void insert_inode_hash(struct inode *inode)
 {
 	__insert_inode_hash(inode, inode->i_ino);
 }
 
-extern void __remove_inode_hash(struct inode *);
+void __remove_inode_hash(struct inode *inode);
 static inline void remove_inode_hash(struct inode *inode)
 {
 	if (!inode_unhashed(inode) && !hlist_fake(&inode->i_hash))
 		__remove_inode_hash(inode);
 }
 
-extern void inode_sb_list_add(struct inode *inode);
-extern void inode_lru_list_add(struct inode *inode);
+void inode_sb_list_add(struct inode *inode);
+void inode_lru_list_add(struct inode *inode);
 
 int generic_file_mmap(struct file *, struct vm_area_struct *);
 int generic_file_mmap_prepare(struct vm_area_desc *desc);