1 #ifndef __FS_CEPH_PAGELIST_H 2 #define __FS_CEPH_PAGELIST_H 3 4 #include <linux/list.h> 5 6 struct ceph_pagelist { 7 struct list_head head; 8 void *mapped_tail; 9 size_t length; 10 size_t room; 11 struct list_head free_list; 12 size_t num_pages_free; 13 }; 14 15 struct ceph_pagelist_cursor { 16 struct ceph_pagelist *pl; /* pagelist, for error checking */ 17 struct list_head *page_lru; /* page in list */ 18 size_t room; /* room remaining to reset to */ 19 }; 20 21 static inline void ceph_pagelist_init(struct ceph_pagelist *pl) 22 { 23 INIT_LIST_HEAD(&pl->head); 24 pl->mapped_tail = NULL; 25 pl->length = 0; 26 pl->room = 0; 27 INIT_LIST_HEAD(&pl->free_list); 28 pl->num_pages_free = 0; 29 } 30 31 extern int ceph_pagelist_release(struct ceph_pagelist *pl); 32 33 extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l); 34 35 extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space); 36 37 extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl); 38 39 extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl, 40 struct ceph_pagelist_cursor *c); 41 42 extern int ceph_pagelist_truncate(struct ceph_pagelist *pl, 43 struct ceph_pagelist_cursor *c); 44 45 static inline int ceph_pagelist_encode_64(struct ceph_pagelist *pl, u64 v) 46 { 47 __le64 ev = cpu_to_le64(v); 48 return ceph_pagelist_append(pl, &ev, sizeof(ev)); 49 } 50 static inline int ceph_pagelist_encode_32(struct ceph_pagelist *pl, u32 v) 51 { 52 __le32 ev = cpu_to_le32(v); 53 return ceph_pagelist_append(pl, &ev, sizeof(ev)); 54 } 55 static inline int ceph_pagelist_encode_16(struct ceph_pagelist *pl, u16 v) 56 { 57 __le16 ev = cpu_to_le16(v); 58 return ceph_pagelist_append(pl, &ev, sizeof(ev)); 59 } 60 static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v) 61 { 62 return ceph_pagelist_append(pl, &v, 1); 63 } 64 static inline int ceph_pagelist_encode_string(struct ceph_pagelist *pl, 65 char *s, size_t len) 66 { 67 int ret = ceph_pagelist_encode_32(pl, len); 68 if (ret) 69 return ret; 70 if (len) 71 return ceph_pagelist_append(pl, s, len); 72 return 0; 73 } 74 75 #endif 76