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_cursor { 21 struct ceph_pagelist *pl; /* pagelist, for error checking */ 22 struct list_head *page_lru; /* page in list */ 23 size_t room; /* room remaining to reset to */ 24 }; 25 26 struct ceph_pagelist *ceph_pagelist_alloc(gfp_t gfp_flags); 27 28 extern void ceph_pagelist_release(struct ceph_pagelist *pl); 29 30 extern int ceph_pagelist_append(struct ceph_pagelist *pl, const void *d, size_t l); 31 32 extern int ceph_pagelist_reserve(struct ceph_pagelist *pl, size_t space); 33 34 extern int ceph_pagelist_free_reserve(struct ceph_pagelist *pl); 35 36 extern void ceph_pagelist_set_cursor(struct ceph_pagelist *pl, 37 struct ceph_pagelist_cursor *c); 38 39 extern int ceph_pagelist_truncate(struct ceph_pagelist *pl, 40 struct ceph_pagelist_cursor *c); 41 42 static inline int ceph_pagelist_encode_64(struct ceph_pagelist *pl, u64 v) 43 { 44 __le64 ev = cpu_to_le64(v); 45 return ceph_pagelist_append(pl, &ev, sizeof(ev)); 46 } 47 static inline int ceph_pagelist_encode_32(struct ceph_pagelist *pl, u32 v) 48 { 49 __le32 ev = cpu_to_le32(v); 50 return ceph_pagelist_append(pl, &ev, sizeof(ev)); 51 } 52 static inline int ceph_pagelist_encode_16(struct ceph_pagelist *pl, u16 v) 53 { 54 __le16 ev = cpu_to_le16(v); 55 return ceph_pagelist_append(pl, &ev, sizeof(ev)); 56 } 57 static inline int ceph_pagelist_encode_8(struct ceph_pagelist *pl, u8 v) 58 { 59 return ceph_pagelist_append(pl, &v, 1); 60 } 61 static inline int ceph_pagelist_encode_string(struct ceph_pagelist *pl, 62 char *s, u32 len) 63 { 64 int ret = ceph_pagelist_encode_32(pl, len); 65 if (ret) 66 return ret; 67 if (len) 68 return ceph_pagelist_append(pl, s, len); 69 return 0; 70 } 71 72 #endif 73