/* cnode related routines for the coda kernel code   (C) 1996 Peter Braam   */ #include <linux/types.h>#include <linux/string.h>#include <linux/time.h> #include <linux/coda.h>#include <linux/coda_psdev.h>#include "coda_linux.h" static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2){	return memcmp(fid1, fid2, sizeof(*fid1)) == 0;} static const struct inode_operations coda_symlink_inode_operations = {	.readlink	= generic_readlink,	.follow_link	= page_follow_link_light,	.put_link	= page_put_link,	.setattr	= coda_setattr,}; /* cnode.c */static void coda_fill_inode(struct inode *inode, struct coda_vattr *attr){        coda_vattr_to_iattr(inode, attr);         if (S_ISREG(inode->i_mode)) {                inode->i_op = &coda_file_inode_operations;                inode->i_fop = &coda_file_operations;        } else if (S_ISDIR(inode->i_mode)) {                inode->i_op = &coda_dir_inode_operations;                inode->i_fop = &coda_dir_operations;        } else if (S_ISLNK(inode->i_mode)) {		inode->i_op = &coda_symlink_inode_operations;		inode->i_data.a_ops = &coda_symlink_aops;		inode->i_mapping = &inode->i_data;	} else                init_special_inode(inode, inode->i_mode, huge_decode_dev(attr->va_rdev));} static int coda_test_inode(struct inode *inode, void *data){	struct CodaFid *fid = (struct CodaFid *)data;	struct coda_inode_info *cii = ITOC(inode);	return coda_fideq(&cii->c_fid, fid);} static int coda_set_inode(struct inode *inode, void *data){	struct CodaFid *fid = (struct CodaFid *)data;	struct coda_inode_info *cii = ITOC(inode);	cii->c_fid = *fid;	return 0;} struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid,			 struct coda_vattr * attr){	struct inode *inode;	struct coda_inode_info *cii;	unsigned long hash = coda_f2i(fid); 	inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid); 	if (!inode)		return ERR_PTR(-ENOMEM); 	if (inode->i_state & I_NEW) {		cii = ITOC(inode);		/* we still need to set i_ino for things like stat(2) */		inode->i_ino = hash;		/* inode is locked and unique, no need to grab cii->c_lock */		cii->c_mapcount = 0;		unlock_new_inode(inode);	} 	/* always replace the attributes, type might have changed */	coda_fill_inode(inode, attr);	return inode;} /* this is effectively coda_iget:   - get attributes (might be cached)   - get the inode for the fid using vfs iget   - link the two up if this is needed   - fill in the attributes*/struct inode *coda_cnode_make(struct CodaFid *fid, struct super_block *sb){        struct coda_vattr attr;	struct inode *inode;        int error;        	/* We get inode numbers from Venus -- see venus source */	error = venus_getattr(sb, fid, &attr);	if (error)		return ERR_PTR(error); 	inode = coda_iget(sb, fid, &attr);	if (IS_ERR(inode))		printk("coda_cnode_make: coda_iget failed\n");	return inode;}  /* Although we treat Coda file identifiers as immutable, there is one * special case for files created during a disconnection where they may * not be globally unique. When an identifier collision is detected we * first try to flush the cached inode from the kernel and finally * resort to renaming/rehashing in-place. Userspace remembers both old * and new values of the identifier to handle any in-flight upcalls. * The real solution is to use globally unique UUIDs as identifiers, but * retrofitting the existing userspace code for this is non-trivial. */void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid, 		      struct CodaFid *newfid){	struct coda_inode_info *cii = ITOC(inode);	unsigned long hash = coda_f2i(newfid);		BUG_ON(!coda_fideq(&cii->c_fid, oldfid)); 	/* replace fid and rehash inode */	/* XXX we probably need to hold some lock here! */	remove_inode_hash(inode);	cii->c_fid = *newfid;	inode->i_ino = hash;	__insert_inode_hash(inode, hash);} /* convert a fid to an inode. */struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb) {	struct inode *inode;	unsigned long hash = coda_f2i(fid); 	if ( !sb ) {		printk("coda_fid_to_inode: no sb!\n");		return NULL;	} 	inode = ilookup5(sb, hash, coda_test_inode, fid);	if ( !inode )		return NULL; 	/* we should never see newly created inodes because we intentionally	 * fail in the initialization callback */	BUG_ON(inode->i_state & I_NEW); 	return inode;} /* the CONTROL inode is made without asking attributes from Venus */struct inode *coda_cnode_makectl(struct super_block *sb){	struct inode *inode = new_inode(sb);	if (inode) {		inode->i_ino = CTL_INO;		inode->i_op = &coda_ioctl_inode_operations;		inode->i_fop = &coda_ioctl_operations;		inode->i_mode = 0444;		return inode;	}	return ERR_PTR(-ENOMEM);}