Mark functions as static

Mark functions used only in the same translation unit as static. This
only includes functions that do not have a prototype in a header file
either.

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Closes #10470

module/os/linux/spl/spl-generic.c

@@ -543,7 +543,7 @@ spl_kernel_read(struct file *file, void *buf, size_t count, loff_t *pos)
 #endif
 }
 
-int
+static int
 spl_getattr(struct file *filp, struct kstat *stat)
 {
 	int rc;

module/os/linux/zfs/spa_stats.c

@@ -952,7 +952,7 @@ spa_iostats_trim_add(spa_t *spa, trim_type_t type,
 	}
 }
 
-int
+static int
 spa_iostats_update(kstat_t *ksp, int rw)
 {
 	if (rw == KSTAT_WRITE) {

module/os/linux/zfs/zfs_acl.c

@@ -648,7 +648,7 @@ zfs_ace_walk(void *datap, uint64_t cookie, int aclcnt,
  * While processing the ACL each ACE will be validated for correctness.
  * ACE FUIDs will be created later.
  */
-int
+static int
 zfs_copy_ace_2_fuid(zfsvfs_t *zfsvfs, umode_t obj_mode, zfs_acl_t *aclp,
     void *datap, zfs_ace_t *z_acl, uint64_t aclcnt, size_t *size,
     zfs_fuid_info_t **fuidp, cred_t *cr)
@@ -1189,7 +1189,7 @@ typedef struct trivial_acl {
 	uint32_t	everyone;	/* allow mask matching mode */
 } trivial_acl_t;
 
-void
+static void
 acl_trivial_access_masks(mode_t mode, boolean_t isdir, trivial_acl_t *masks)
 {
 	uint32_t read_mask = ACE_READ_DATA;
@@ -1262,7 +1262,7 @@ acl_trivial_access_masks(mode_t mode, boolean_t isdir, trivial_acl_t *masks)
  * have read_acl denied, and write_owner/write_acl/write_attributes
  * can only be owner@ entry.
  */
-int
+static int
 ace_trivial_common(void *acep, int aclcnt,
     uint64_t (*walk)(void *, uint64_t, int aclcnt,
     uint16_t *, uint16_t *, uint32_t *))

module/os/linux/zfs/zfs_vfsops.c

@@ -971,7 +971,7 @@ zfs_set_fuid_feature(zfsvfs_t *zfsvfs)
 	zfsvfs->z_use_sa = USE_SA(zfsvfs->z_version, zfsvfs->z_os);
 }
 
-void
+static void
 zfs_unregister_callbacks(zfsvfs_t *zfsvfs)
 {
 	objset_t *os = zfsvfs->z_os;
@@ -1159,7 +1159,7 @@ zfs_statvfs(struct inode *ip, struct kstatfs *statp)
 	return (err);
 }
 
-int
+static int
 zfs_root(zfsvfs_t *zfsvfs, struct inode **ipp)
 {
 	znode_t *rootzp;

module/os/linux/zfs/zfs_vnops.c

@@ -1041,7 +1041,7 @@ zfs_zrele_async(znode_t *zp)
 }
 
 /* ARGSUSED */
-void
+static void
 zfs_get_done(zgd_t *zgd, int error)
 {
 	znode_t *zp = zgd->zgd_private;

module/os/linux/zfs/zfs_znode.c

@@ -249,7 +249,7 @@ zfs_znode_hold_compare(const void *a, const void *b)
 	return (TREE_CMP(zh_a->zh_obj, zh_b->zh_obj));
 }
 
-boolean_t
+static boolean_t __maybe_unused
 zfs_znode_held(zfsvfs_t *zfsvfs, uint64_t obj)
 {
 	znode_hold_t *zh, search;
@@ -451,7 +451,7 @@ zfs_inode_set_ops(zfsvfs_t *zfsvfs, struct inode *ip)
 	}
 }
 
-void
+static void
 zfs_set_inode_flags(znode_t *zp, struct inode *ip)
 {
 	/*
@@ -2013,7 +2013,7 @@ zfs_grab_sa_handle(objset_t *osp, uint64_t obj, sa_handle_t **hdlp,
 	return (0);
 }
 
-void
+static void
 zfs_release_sa_handle(sa_handle_t *hdl, dmu_buf_t *db, void *tag)
 {
 	sa_handle_destroy(hdl);

module/os/linux/zfs/zpl_file.c

@@ -651,7 +651,7 @@ zpl_readpages(struct file *filp, struct address_space *mapping,
 	    (filler_t *)zpl_readpage, filp));
 }
 
-int
+static int
 zpl_putpage(struct page *pp, struct writeback_control *wbc, void *data)
 {
 	struct address_space *mapping = data;

module/os/linux/zfs/zpl_inode.c

@@ -518,7 +518,7 @@ zpl_get_link_common(struct dentry *dentry, struct inode *ip, char **link)
 }
 
 #if defined(HAVE_GET_LINK_DELAYED)
-const char *
+static const char *
 zpl_get_link(struct dentry *dentry, struct inode *inode,
     struct delayed_call *done)
 {
@@ -537,7 +537,7 @@ zpl_get_link(struct dentry *dentry, struct inode *inode,
 	return (link);
 }
 #elif defined(HAVE_GET_LINK_COOKIE)
-const char *
+static const char *
 zpl_get_link(struct dentry *dentry, struct inode *inode, void **cookie)
 {
 	char *link = NULL;
@@ -553,7 +553,7 @@ zpl_get_link(struct dentry *dentry, struct inode *inode, void **cookie)
 	return (*cookie = link);
 }
 #elif defined(HAVE_FOLLOW_LINK_COOKIE)
-const char *
+static const char *
 zpl_follow_link(struct dentry *dentry, void **cookie)
 {
 	char *link = NULL;

module/os/linux/zfs/zpl_xattr.c

@@ -148,7 +148,7 @@ zpl_xattr_filldir(xattr_filldir_t *xf, const char *name, int name_len)
  * Read as many directory entry names as will fit in to the provided buffer,
  * or when no buffer is provided calculate the required buffer size.
  */
-int
+static int
 zpl_xattr_readdir(struct inode *dxip, xattr_filldir_t *xf)
 {
 	zap_cursor_t zc;
@@ -920,6 +920,9 @@ xattr_handler_t zpl_xattr_security_handler = {
  * attribute implemented by filesystems in the kernel." - xattr(7)
  */
 #ifdef CONFIG_FS_POSIX_ACL
+#ifndef HAVE_SET_ACL
+static
+#endif
 int
 zpl_set_acl(struct inode *ip, struct posix_acl *acl, int type)
 {

module/os/linux/zfs/zvol_os.c

@@ -640,7 +640,7 @@ zvol_revalidate_disk(struct gendisk *disk)
 	return (0);
 }
 
-int
+static int
 zvol_update_volsize(zvol_state_t *zv, uint64_t volsize)
 {