/* 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_linux.h> #include <linux/coda_fs_i.h> #include <linux/coda_psdev.h> static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2) { return memcmp(fid1, fid2, sizeof(*fid1)) == 0; } static 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; return coda_fideq(&(ITOC(inode)->c_fid), fid); } static int coda_set_inode(struct inode *inode, void *data) { struct CodaFid *fid = (struct CodaFid *)data; ITOC(inode)->c_fid = *fid; return 0; } static int coda_fail_inode(struct inode *inode, void *data) { return -1; } 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; 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 */ int coda_cnode_make(struct inode **inode, struct CodaFid *fid, struct super_block *sb) { struct coda_vattr attr; int error; /* We get inode numbers from Venus -- see venus source */ error = venus_getattr(sb, fid, &attr); if ( error ) { *inode = NULL; return error; } *inode = coda_iget(sb, fid, &attr); if ( IS_ERR(*inode) ) { printk("coda_cnode_make: coda_iget failed\n"); return PTR_ERR(*inode); } return 0; } void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid, struct CodaFid *newfid) { struct coda_inode_info *cii; unsigned long hash = coda_f2i(newfid); cii = ITOC(inode); if (!coda_fideq(&cii->c_fid, oldfid)) BUG(); /* 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 = iget5_locked(sb, hash, coda_test_inode, coda_fail_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 */ int coda_cnode_makectl(struct inode **inode, struct super_block *sb) { int error = -ENOMEM; *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; error = 0; } return error; }