1 /* cnode related routines for the coda kernel code 2 (C) 1996 Peter Braam 3 */ 4 5 #include <linux/types.h> 6 #include <linux/string.h> 7 #include <linux/time.h> 8 9 #include <linux/coda.h> 10 #include <linux/coda_linux.h> 11 #include <linux/coda_fs_i.h> 12 #include <linux/coda_psdev.h> 13 14 static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2) 15 { 16 return memcmp(fid1, fid2, sizeof(*fid1)) == 0; 17 } 18 19 static const struct inode_operations coda_symlink_inode_operations = { 20 .readlink = generic_readlink, 21 .follow_link = page_follow_link_light, 22 .put_link = page_put_link, 23 .setattr = coda_setattr, 24 }; 25 26 /* cnode.c */ 27 static void coda_fill_inode(struct inode *inode, struct coda_vattr *attr) 28 { 29 coda_vattr_to_iattr(inode, attr); 30 31 if (S_ISREG(inode->i_mode)) { 32 inode->i_op = &coda_file_inode_operations; 33 inode->i_fop = &coda_file_operations; 34 } else if (S_ISDIR(inode->i_mode)) { 35 inode->i_op = &coda_dir_inode_operations; 36 inode->i_fop = &coda_dir_operations; 37 } else if (S_ISLNK(inode->i_mode)) { 38 inode->i_op = &coda_symlink_inode_operations; 39 inode->i_data.a_ops = &coda_symlink_aops; 40 inode->i_mapping = &inode->i_data; 41 } else 42 init_special_inode(inode, inode->i_mode, huge_decode_dev(attr->va_rdev)); 43 } 44 45 static int coda_test_inode(struct inode *inode, void *data) 46 { 47 struct CodaFid *fid = (struct CodaFid *)data; 48 return coda_fideq(&(ITOC(inode)->c_fid), fid); 49 } 50 51 static int coda_set_inode(struct inode *inode, void *data) 52 { 53 struct CodaFid *fid = (struct CodaFid *)data; 54 ITOC(inode)->c_fid = *fid; 55 return 0; 56 } 57 58 static int coda_fail_inode(struct inode *inode, void *data) 59 { 60 return -1; 61 } 62 63 struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid, 64 struct coda_vattr * attr) 65 { 66 struct inode *inode; 67 struct coda_inode_info *cii; 68 unsigned long hash = coda_f2i(fid); 69 70 inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid); 71 72 if (!inode) 73 return ERR_PTR(-ENOMEM); 74 75 if (inode->i_state & I_NEW) { 76 cii = ITOC(inode); 77 /* we still need to set i_ino for things like stat(2) */ 78 inode->i_ino = hash; 79 cii->c_mapcount = 0; 80 unlock_new_inode(inode); 81 } 82 83 /* always replace the attributes, type might have changed */ 84 coda_fill_inode(inode, attr); 85 return inode; 86 } 87 88 /* this is effectively coda_iget: 89 - get attributes (might be cached) 90 - get the inode for the fid using vfs iget 91 - link the two up if this is needed 92 - fill in the attributes 93 */ 94 int coda_cnode_make(struct inode **inode, struct CodaFid *fid, struct super_block *sb) 95 { 96 struct coda_vattr attr; 97 int error; 98 99 /* We get inode numbers from Venus -- see venus source */ 100 error = venus_getattr(sb, fid, &attr); 101 if ( error ) { 102 *inode = NULL; 103 return error; 104 } 105 106 *inode = coda_iget(sb, fid, &attr); 107 if ( IS_ERR(*inode) ) { 108 printk("coda_cnode_make: coda_iget failed\n"); 109 return PTR_ERR(*inode); 110 } 111 return 0; 112 } 113 114 115 void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid, 116 struct CodaFid *newfid) 117 { 118 struct coda_inode_info *cii; 119 unsigned long hash = coda_f2i(newfid); 120 121 cii = ITOC(inode); 122 123 BUG_ON(!coda_fideq(&cii->c_fid, oldfid)); 124 125 /* replace fid and rehash inode */ 126 /* XXX we probably need to hold some lock here! */ 127 remove_inode_hash(inode); 128 cii->c_fid = *newfid; 129 inode->i_ino = hash; 130 __insert_inode_hash(inode, hash); 131 } 132 133 /* convert a fid to an inode. */ 134 struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb) 135 { 136 struct inode *inode; 137 unsigned long hash = coda_f2i(fid); 138 139 if ( !sb ) { 140 printk("coda_fid_to_inode: no sb!\n"); 141 return NULL; 142 } 143 144 inode = iget5_locked(sb, hash, coda_test_inode, coda_fail_inode, fid); 145 if ( !inode ) 146 return NULL; 147 148 /* we should never see newly created inodes because we intentionally 149 * fail in the initialization callback */ 150 BUG_ON(inode->i_state & I_NEW); 151 152 return inode; 153 } 154 155 /* the CONTROL inode is made without asking attributes from Venus */ 156 int coda_cnode_makectl(struct inode **inode, struct super_block *sb) 157 { 158 int error = -ENOMEM; 159 160 *inode = new_inode(sb); 161 if (*inode) { 162 (*inode)->i_ino = CTL_INO; 163 (*inode)->i_op = &coda_ioctl_inode_operations; 164 (*inode)->i_fop = &coda_ioctl_operations; 165 (*inode)->i_mode = 0444; 166 error = 0; 167 } 168 169 return error; 170 } 171 172