1 #include <linux/reiserfs_fs.h> 2 #include <linux/capability.h> 3 #include <linux/errno.h> 4 #include <linux/fs.h> 5 #include <linux/pagemap.h> 6 #include <linux/xattr.h> 7 #include <linux/reiserfs_xattr.h> 8 #include <asm/uaccess.h> 9 10 #define XATTR_TRUSTED_PREFIX "trusted." 11 12 static int 13 trusted_get(struct inode *inode, const char *name, void *buffer, size_t size) 14 { 15 if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX)) 16 return -EINVAL; 17 18 if (!reiserfs_xattrs(inode->i_sb)) 19 return -EOPNOTSUPP; 20 21 if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode))) 22 return -EPERM; 23 24 return reiserfs_xattr_get(inode, name, buffer, size); 25 } 26 27 static int 28 trusted_set(struct inode *inode, const char *name, const void *buffer, 29 size_t size, int flags) 30 { 31 if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX)) 32 return -EINVAL; 33 34 if (!reiserfs_xattrs(inode->i_sb)) 35 return -EOPNOTSUPP; 36 37 if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode))) 38 return -EPERM; 39 40 return reiserfs_xattr_set(inode, name, buffer, size, flags); 41 } 42 43 static int trusted_del(struct inode *inode, const char *name) 44 { 45 if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX)) 46 return -EINVAL; 47 48 if (!reiserfs_xattrs(inode->i_sb)) 49 return -EOPNOTSUPP; 50 51 if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode))) 52 return -EPERM; 53 54 return 0; 55 } 56 57 static int 58 trusted_list(struct inode *inode, const char *name, int namelen, char *out) 59 { 60 int len = namelen; 61 62 if (!reiserfs_xattrs(inode->i_sb)) 63 return 0; 64 65 if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode))) 66 return 0; 67 68 if (out) 69 memcpy(out, name, len); 70 71 return len; 72 } 73 74 struct reiserfs_xattr_handler trusted_handler = { 75 .prefix = XATTR_TRUSTED_PREFIX, 76 .get = trusted_get, 77 .set = trusted_set, 78 .del = trusted_del, 79 .list = trusted_list, 80 }; 81