1 /* 2 * (C) 2001 Clemson University and The University of Chicago 3 * 4 * See COPYING in top-level directory. 5 */ 6 7 #include "protocol.h" 8 #include "orangefs-kernel.h" 9 #include "orangefs-bufmap.h" 10 #include <linux/posix_acl_xattr.h> 11 #include <linux/fs_struct.h> 12 13 struct posix_acl *orangefs_get_acl(struct inode *inode, int type) 14 { 15 struct posix_acl *acl; 16 int ret; 17 char *key = NULL, *value = NULL; 18 19 switch (type) { 20 case ACL_TYPE_ACCESS: 21 key = XATTR_NAME_POSIX_ACL_ACCESS; 22 break; 23 case ACL_TYPE_DEFAULT: 24 key = XATTR_NAME_POSIX_ACL_DEFAULT; 25 break; 26 default: 27 gossip_err("orangefs_get_acl: bogus value of type %d\n", type); 28 return ERR_PTR(-EINVAL); 29 } 30 /* 31 * Rather than incurring a network call just to determine the exact 32 * length of the attribute, I just allocate a max length to save on 33 * the network call. Conceivably, we could pass NULL to 34 * orangefs_inode_getxattr() to probe the length of the value, but 35 * I don't do that for now. 36 */ 37 value = kmalloc(ORANGEFS_MAX_XATTR_VALUELEN, GFP_KERNEL); 38 if (value == NULL) 39 return ERR_PTR(-ENOMEM); 40 41 gossip_debug(GOSSIP_ACL_DEBUG, 42 "inode %pU, key %s, type %d\n", 43 get_khandle_from_ino(inode), 44 key, 45 type); 46 ret = orangefs_inode_getxattr(inode, key, value, 47 ORANGEFS_MAX_XATTR_VALUELEN); 48 /* if the key exists, convert it to an in-memory rep */ 49 if (ret > 0) { 50 acl = posix_acl_from_xattr(&init_user_ns, value, ret); 51 } else if (ret == -ENODATA || ret == -ENOSYS) { 52 acl = NULL; 53 } else { 54 gossip_err("inode %pU retrieving acl's failed with error %d\n", 55 get_khandle_from_ino(inode), 56 ret); 57 acl = ERR_PTR(ret); 58 } 59 /* kfree(NULL) is safe, so don't worry if value ever got used */ 60 kfree(value); 61 return acl; 62 } 63 64 int orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type) 65 { 66 struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode); 67 int error = 0; 68 void *value = NULL; 69 size_t size = 0; 70 const char *name = NULL; 71 72 switch (type) { 73 case ACL_TYPE_ACCESS: 74 name = XATTR_NAME_POSIX_ACL_ACCESS; 75 if (acl) { 76 umode_t mode = inode->i_mode; 77 /* 78 * can we represent this with the traditional file 79 * mode permission bits? 80 */ 81 error = posix_acl_equiv_mode(acl, &mode); 82 if (error < 0) { 83 gossip_err("%s: posix_acl_equiv_mode err: %d\n", 84 __func__, 85 error); 86 return error; 87 } 88 89 if (inode->i_mode != mode) 90 SetModeFlag(orangefs_inode); 91 inode->i_mode = mode; 92 mark_inode_dirty_sync(inode); 93 if (error == 0) 94 acl = NULL; 95 } 96 break; 97 case ACL_TYPE_DEFAULT: 98 name = XATTR_NAME_POSIX_ACL_DEFAULT; 99 break; 100 default: 101 gossip_err("%s: invalid type %d!\n", __func__, type); 102 return -EINVAL; 103 } 104 105 gossip_debug(GOSSIP_ACL_DEBUG, 106 "%s: inode %pU, key %s type %d\n", 107 __func__, get_khandle_from_ino(inode), 108 name, 109 type); 110 111 if (acl) { 112 size = posix_acl_xattr_size(acl->a_count); 113 value = kmalloc(size, GFP_KERNEL); 114 if (!value) 115 return -ENOMEM; 116 117 error = posix_acl_to_xattr(&init_user_ns, acl, value, size); 118 if (error < 0) 119 goto out; 120 } 121 122 gossip_debug(GOSSIP_ACL_DEBUG, 123 "%s: name %s, value %p, size %zd, acl %p\n", 124 __func__, name, value, size, acl); 125 /* 126 * Go ahead and set the extended attribute now. NOTE: Suppose acl 127 * was NULL, then value will be NULL and size will be 0 and that 128 * will xlate to a removexattr. However, we don't want removexattr 129 * complain if attributes does not exist. 130 */ 131 error = orangefs_inode_setxattr(inode, name, value, size, 0); 132 133 out: 134 kfree(value); 135 if (!error) 136 set_cached_acl(inode, type, acl); 137 return error; 138 } 139 140 int orangefs_init_acl(struct inode *inode, struct inode *dir) 141 { 142 struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode); 143 struct posix_acl *default_acl, *acl; 144 umode_t mode = inode->i_mode; 145 int error = 0; 146 147 ClearModeFlag(orangefs_inode); 148 149 error = posix_acl_create(dir, &mode, &default_acl, &acl); 150 if (error) 151 return error; 152 153 if (default_acl) { 154 error = orangefs_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); 155 posix_acl_release(default_acl); 156 } 157 158 if (acl) { 159 if (!error) 160 error = orangefs_set_acl(inode, acl, ACL_TYPE_ACCESS); 161 posix_acl_release(acl); 162 } 163 164 /* If mode of the inode was changed, then do a forcible ->setattr */ 165 if (mode != inode->i_mode) { 166 SetModeFlag(orangefs_inode); 167 inode->i_mode = mode; 168 orangefs_flush_inode(inode); 169 } 170 171 return error; 172 } 173