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 struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid, 59 struct coda_vattr * attr) 60 { 61 struct inode *inode; 62 struct coda_inode_info *cii; 63 unsigned long hash = coda_f2i(fid); 64 65 inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid); 66 67 if (!inode) 68 return ERR_PTR(-ENOMEM); 69 70 if (inode->i_state & I_NEW) { 71 cii = ITOC(inode); 72 /* we still need to set i_ino for things like stat(2) */ 73 inode->i_ino = hash; 74 cii->c_mapcount = 0; 75 unlock_new_inode(inode); 76 } 77 78 /* always replace the attributes, type might have changed */ 79 coda_fill_inode(inode, attr); 80 return inode; 81 } 82 83 /* this is effectively coda_iget: 84 - get attributes (might be cached) 85 - get the inode for the fid using vfs iget 86 - link the two up if this is needed 87 - fill in the attributes 88 */ 89 int coda_cnode_make(struct inode **inode, struct CodaFid *fid, struct super_block *sb) 90 { 91 struct coda_vattr attr; 92 int error; 93 94 /* We get inode numbers from Venus -- see venus source */ 95 error = venus_getattr(sb, fid, &attr); 96 if ( error ) { 97 *inode = NULL; 98 return error; 99 } 100 101 *inode = coda_iget(sb, fid, &attr); 102 if ( IS_ERR(*inode) ) { 103 printk("coda_cnode_make: coda_iget failed\n"); 104 return PTR_ERR(*inode); 105 } 106 return 0; 107 } 108 109 110 void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid, 111 struct CodaFid *newfid) 112 { 113 struct coda_inode_info *cii; 114 unsigned long hash = coda_f2i(newfid); 115 116 cii = ITOC(inode); 117 118 BUG_ON(!coda_fideq(&cii->c_fid, oldfid)); 119 120 /* replace fid and rehash inode */ 121 /* XXX we probably need to hold some lock here! */ 122 remove_inode_hash(inode); 123 cii->c_fid = *newfid; 124 inode->i_ino = hash; 125 __insert_inode_hash(inode, hash); 126 } 127 128 /* convert a fid to an inode. */ 129 struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb) 130 { 131 struct inode *inode; 132 unsigned long hash = coda_f2i(fid); 133 134 if ( !sb ) { 135 printk("coda_fid_to_inode: no sb!\n"); 136 return NULL; 137 } 138 139 inode = ilookup5(sb, hash, coda_test_inode, fid); 140 if ( !inode ) 141 return NULL; 142 143 /* we should never see newly created inodes because we intentionally 144 * fail in the initialization callback */ 145 BUG_ON(inode->i_state & I_NEW); 146 147 return inode; 148 } 149 150 /* the CONTROL inode is made without asking attributes from Venus */ 151 int coda_cnode_makectl(struct inode **inode, struct super_block *sb) 152 { 153 int error = -ENOMEM; 154 155 *inode = new_inode(sb); 156 if (*inode) { 157 (*inode)->i_ino = CTL_INO; 158 (*inode)->i_op = &coda_ioctl_inode_operations; 159 (*inode)->i_fop = &coda_ioctl_operations; 160 (*inode)->i_mode = 0444; 161 error = 0; 162 } 163 164 return error; 165 } 166 167