1 /** 2 * @file op_dcache.h 3 * Compatibility functions for dcache lookups 4 * 5 * @remark Copyright 2002 OProfile authors 6 * @remark Read the file COPYING 7 * 8 * @author Philippe Elie 9 * @author John Levon 10 */ 11 12 #ifndef OP_DCACHE_H 13 #define OP_DCACHE_H 14 15 #include <linux/sched.h> 16 #include <linux/unistd.h> 17 #include <linux/mman.h> 18 #include <linux/file.h> 19 20 #include "oprofile.h" 21 22 extern uint op_dname_top; 23 extern struct qstr **op_dname_stack; 24 extern char * op_pool_pos; 25 extern char * op_pool_start; 26 extern char * op_pool_end; 27 28 uint do_hash(struct dentry * dentry, struct vfsmount * vfsmnt, struct dentry * root, struct vfsmount * rootmnt); 29 30 inline static uint alloc_in_pool(char const * str, uint len); 31 inline static int add_hash_entry(struct op_hash_index * entry, uint parent, char const * name, uint len); 32 inline static uint name_hash(char const * name, uint len, uint parent); 33 34 inline static uint name_hash(char const * name, uint len, uint parent) 35 { 36 uint hash=0; 37 38 while (len--) 39 hash = (hash + (name[len] << 4) + (name[len] >> 4)) * 11; 40 41 return (hash ^ parent) % OP_HASH_MAP_NR; 42 } 43 44 /* empty ascending dname stack */ 45 inline static void push_dname(struct qstr * dname) 46 { 47 op_dname_stack[op_dname_top] = dname; 48 if (op_dname_top != DNAME_STACK_MAX) 49 op_dname_top++; 50 else 51 printk(KERN_ERR "oprofile: overflowed dname stack !\n"); 52 } 53 54 inline static struct qstr * pop_dname(void) 55 { 56 if (op_dname_top == 0) 57 return NULL; 58 59 return op_dname_stack[--op_dname_top]; 60 } 61 62 inline static uint alloc_in_pool(char const * str, uint len) 63 { 64 char * place = op_pool_pos; 65 if (op_pool_pos + len + 1 >= op_pool_end) 66 return 0; 67 68 strcpy(place, str); 69 op_pool_pos += len + 1; 70 return place - op_pool_start; 71 } 72 73 inline static char * get_from_pool(uint index) 74 { 75 return op_pool_start + index; 76 } 77 78 inline static int add_hash_entry(struct op_hash_index * entry, uint parent, char const * name, uint len) 79 { 80 entry->name = alloc_in_pool(name, len); 81 if (!entry->name) 82 return -1; 83 entry->parent = parent; 84 return 0; 85 } 86 87 #endif /* OP_DCACHE_H */ 88
