1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __FS_CEPH_PAGELIST_H 3 #define __FS_CEPH_PAGELIST_H 4 5 #include <asm/byteorder.h> 6 #include <linux/refcount.h> 7 #include <linux/list.h> 8 #include <linux/types.h> 9 10 struct ceph_pagelist { 11 struct list_head head; 12 void *mapped_tail; 13 size_t length; 14 size_t room; 15 struct list_head free_list; 16 size_t num_pages_free; 17 refcount_t refcnt; 18 }; 19 20 struct ceph_pagelist *ceph_pagelist_alloc(gfp_t gfp_flags); 21 22 extern void ceph_pagelist_release(struct ceph_pagelist *pl); 23 24 extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l); 25 26 extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space); 27 28 extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl); 29 30 static inline int ceph_pagelist_encode_64(struct ceph_pagelist *pl, u64 v) 31 { 32 __le64 ev = cpu_to_le64(v); 33 return ceph_pagelist_append(pl, &ev, sizeof(ev)); 34 } 35 static inline int ceph_pagelist_encode_32(struct ceph_pagelist *pl, u32 v) 36 { 37 __le32 ev = cpu_to_le32(v); 38 return ceph_pagelist_append(pl, &ev, sizeof(ev)); 39 } 40 static inline int ceph_pagelist_encode_16(struct ceph_pagelist *pl, u16 v) 41 { 42 __le16 ev = cpu_to_le16(v); 43 return ceph_pagelist_append(pl, &ev, sizeof(ev)); 44 } 45 static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v) 46 { 47 return ceph_pagelist_append(pl, &v, 1); 48 } 49 static inline int ceph_pagelist_encode_string(struct ceph_pagelist *pl, 50 char *s, u32 len) 51 { 52 int ret = ceph_pagelist_encode_32(pl, len); 53 if (ret) 54 return ret; 55 if (len) 56 return ceph_pagelist_append(pl, s, len); 57 return 0; 58 } 59 60 #endif 61