1 #ifndef __FS_CEPH_PAGELIST_H 2 #define __FS_CEPH_PAGELIST_H 3 4 #include <asm/byteorder.h> 5 #include <linux/refcount.h> 6 #include <linux/list.h> 7 #include <linux/types.h> 8 9 struct ceph_pagelist { 10 struct list_head head; 11 void *mapped_tail; 12 size_t length; 13 size_t room; 14 struct list_head free_list; 15 size_t num_pages_free; 16 refcount_t refcnt; 17 }; 18 19 struct ceph_pagelist_cursor { 20 struct ceph_pagelist *pl; /* pagelist, for error checking */ 21 struct list_head *page_lru; /* page in list */ 22 size_t room; /* room remaining to reset to */ 23 }; 24 25 static inline void ceph_pagelist_init(struct ceph_pagelist *pl) 26 { 27 INIT_LIST_HEAD(&pl->head); 28 pl->mapped_tail = NULL; 29 pl->length = 0; 30 pl->room = 0; 31 INIT_LIST_HEAD(&pl->free_list); 32 pl->num_pages_free = 0; 33 refcount_set(&pl->refcnt, 1); 34 } 35 36 extern void ceph_pagelist_release(struct ceph_pagelist *pl); 37 38 extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l); 39 40 extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space); 41 42 extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl); 43 44 extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl, 45 struct ceph_pagelist_cursor *c); 46 47 extern int ceph_pagelist_truncate(struct ceph_pagelist *pl, 48 struct ceph_pagelist_cursor *c); 49 50 static inline int ceph_pagelist_encode_64(struct ceph_pagelist *pl, u64 v) 51 { 52 __le64 ev = cpu_to_le64(v); 53 return ceph_pagelist_append(pl, &ev, sizeof(ev)); 54 } 55 static inline int ceph_pagelist_encode_32(struct ceph_pagelist *pl, u32 v) 56 { 57 __le32 ev = cpu_to_le32(v); 58 return ceph_pagelist_append(pl, &ev, sizeof(ev)); 59 } 60 static inline int ceph_pagelist_encode_16(struct ceph_pagelist *pl, u16 v) 61 { 62 __le16 ev = cpu_to_le16(v); 63 return ceph_pagelist_append(pl, &ev, sizeof(ev)); 64 } 65 static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v) 66 { 67 return ceph_pagelist_append(pl, &v, 1); 68 } 69 static inline int ceph_pagelist_encode_string(struct ceph_pagelist *pl, 70 char *s, size_t len) 71 { 72 int ret = ceph_pagelist_encode_32(pl, len); 73 if (ret) 74 return ret; 75 if (len) 76 return ceph_pagelist_append(pl, s, len); 77 return 0; 78 } 79 80 #endif 81