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1 /* 1 /*
2 * Copyright (c) International Business Machin 2 * Copyright (c) International Business Machines Corp., 2006
3 * 3 *
4 * This program is free software; you can redi 4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Publi 5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either versio 6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version. 7 * (at your option) any later version.
8 * 8 *
9 * This program is distributed in the hope tha 9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more det 12 * the GNU General Public License for more details.
13 * 13 *
14 * You should have received a copy of the GNU 14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to t 15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 33 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 * 17 *
18 * Author: Artem Bityutskiy (Битюцкий 18 * Author: Artem Bityutskiy (Битюцкий Артём)
19 */ 19 */
20 20
21 #ifndef __UBI_SCAN_H__ 21 #ifndef __UBI_SCAN_H__
22 #define __UBI_SCAN_H__ 22 #define __UBI_SCAN_H__
23 23
24 /* The erase counter value for this physical e 24 /* The erase counter value for this physical eraseblock is unknown */
25 #define UBI_SCAN_UNKNOWN_EC (-1) 25 #define UBI_SCAN_UNKNOWN_EC (-1)
26 26
27 /** 27 /**
28 * struct ubi_scan_leb - scanning information 28 * struct ubi_scan_leb - scanning information about a physical eraseblock.
29 * @ec: erase counter (%UBI_SCAN_UNKNOWN_EC if 29 * @ec: erase counter (%UBI_SCAN_UNKNOWN_EC if it is unknown)
30 * @pnum: physical eraseblock number 30 * @pnum: physical eraseblock number
31 * @lnum: logical eraseblock number 31 * @lnum: logical eraseblock number
32 * @scrub: if this physical eraseblock needs s 32 * @scrub: if this physical eraseblock needs scrubbing
33 * @sqnum: sequence number 33 * @sqnum: sequence number
34 * @u: unions RB-tree or @list links 34 * @u: unions RB-tree or @list links
35 * @u.rb: link in the per-volume RB-tree of &s 35 * @u.rb: link in the per-volume RB-tree of &struct ubi_scan_leb objects
36 * @u.list: link in one of the eraseblock list 36 * @u.list: link in one of the eraseblock lists
37 * @leb_ver: logical eraseblock version (obsol 37 * @leb_ver: logical eraseblock version (obsolete)
38 * 38 *
39 * One object of this type is allocated for ea 39 * One object of this type is allocated for each physical eraseblock during
40 * scanning. 40 * scanning.
41 */ 41 */
42 struct ubi_scan_leb { 42 struct ubi_scan_leb {
43 int ec; 43 int ec;
44 int pnum; 44 int pnum;
45 int lnum; 45 int lnum;
46 int scrub; 46 int scrub;
47 unsigned long long sqnum; 47 unsigned long long sqnum;
48 union { 48 union {
49 struct rb_node rb; 49 struct rb_node rb;
50 struct list_head list; 50 struct list_head list;
51 } u; 51 } u;
52 uint32_t leb_ver; 52 uint32_t leb_ver;
53 }; 53 };
54 54
55 /** 55 /**
56 * struct ubi_scan_volume - scanning informati 56 * struct ubi_scan_volume - scanning information about a volume.
57 * @vol_id: volume ID 57 * @vol_id: volume ID
58 * @highest_lnum: highest logical eraseblock n 58 * @highest_lnum: highest logical eraseblock number in this volume
59 * @leb_count: number of logical eraseblocks i 59 * @leb_count: number of logical eraseblocks in this volume
60 * @vol_type: volume type 60 * @vol_type: volume type
61 * @used_ebs: number of used logical erasebloc 61 * @used_ebs: number of used logical eraseblocks in this volume (only for
62 * static volumes) 62 * static volumes)
63 * @last_data_size: amount of data in the last 63 * @last_data_size: amount of data in the last logical eraseblock of this
64 * volume (always equivalent to the usable log 64 * volume (always equivalent to the usable logical eraseblock size in case of
65 * dynamic volumes) 65 * dynamic volumes)
66 * @data_pad: how many bytes at the end of log 66 * @data_pad: how many bytes at the end of logical eraseblocks of this volume
67 * are not used (due to volume alignment) 67 * are not used (due to volume alignment)
68 * @compat: compatibility flags of this volume 68 * @compat: compatibility flags of this volume
69 * @rb: link in the volume RB-tree 69 * @rb: link in the volume RB-tree
70 * @root: root of the RB-tree containing all t 70 * @root: root of the RB-tree containing all the eraseblock belonging to this
71 * volume (&struct ubi_scan_leb objects) 71 * volume (&struct ubi_scan_leb objects)
72 * 72 *
73 * One object of this type is allocated for ea 73 * One object of this type is allocated for each volume during scanning.
74 */ 74 */
75 struct ubi_scan_volume { 75 struct ubi_scan_volume {
76 int vol_id; 76 int vol_id;
77 int highest_lnum; 77 int highest_lnum;
78 int leb_count; 78 int leb_count;
79 int vol_type; 79 int vol_type;
80 int used_ebs; 80 int used_ebs;
81 int last_data_size; 81 int last_data_size;
82 int data_pad; 82 int data_pad;
83 int compat; 83 int compat;
84 struct rb_node rb; 84 struct rb_node rb;
85 struct rb_root root; 85 struct rb_root root;
86 }; 86 };
87 87
88 /** 88 /**
89 * struct ubi_scan_info - UBI scanning informa 89 * struct ubi_scan_info - UBI scanning information.
90 * @volumes: root of the volume RB-tree 90 * @volumes: root of the volume RB-tree
91 * @corr: list of corrupted physical erasebloc 91 * @corr: list of corrupted physical eraseblocks
92 * @free: list of free physical eraseblocks 92 * @free: list of free physical eraseblocks
93 * @erase: list of physical eraseblocks which 93 * @erase: list of physical eraseblocks which have to be erased
94 * @alien: list of physical eraseblocks which 94 * @alien: list of physical eraseblocks which should not be used by UBI (e.g.,
95 * @bad_peb_count: count of bad physical erase 95 * @bad_peb_count: count of bad physical eraseblocks
96 * those belonging to "preserve"-compatible in 96 * those belonging to "preserve"-compatible internal volumes)
97 * @vols_found: number of volumes found during 97 * @vols_found: number of volumes found during scanning
98 * @highest_vol_id: highest volume ID 98 * @highest_vol_id: highest volume ID
99 * @alien_peb_count: count of physical erasebl 99 * @alien_peb_count: count of physical eraseblocks in the @alien list
100 * @is_empty: flag indicating whether the MTD 100 * @is_empty: flag indicating whether the MTD device is empty or not
101 * @min_ec: lowest erase counter value 101 * @min_ec: lowest erase counter value
102 * @max_ec: highest erase counter value 102 * @max_ec: highest erase counter value
103 * @max_sqnum: highest sequence number value 103 * @max_sqnum: highest sequence number value
104 * @mean_ec: mean erase counter value 104 * @mean_ec: mean erase counter value
105 * @ec_sum: a temporary variable used when cal 105 * @ec_sum: a temporary variable used when calculating @mean_ec
106 * @ec_count: a temporary variable used when c 106 * @ec_count: a temporary variable used when calculating @mean_ec
107 * 107 *
108 * This data structure contains the result of 108 * This data structure contains the result of scanning and may be used by other
109 * UBI units to build final UBI data structure 109 * UBI units to build final UBI data structures, further error-recovery and so
110 * on. 110 * on.
111 */ 111 */
112 struct ubi_scan_info { 112 struct ubi_scan_info {
113 struct rb_root volumes; 113 struct rb_root volumes;
114 struct list_head corr; 114 struct list_head corr;
115 struct list_head free; 115 struct list_head free;
116 struct list_head erase; 116 struct list_head erase;
117 struct list_head alien; 117 struct list_head alien;
118 int bad_peb_count; 118 int bad_peb_count;
119 int vols_found; 119 int vols_found;
120 int highest_vol_id; 120 int highest_vol_id;
121 int alien_peb_count; 121 int alien_peb_count;
122 int is_empty; 122 int is_empty;
123 int min_ec; 123 int min_ec;
124 int max_ec; 124 int max_ec;
125 unsigned long long max_sqnum; 125 unsigned long long max_sqnum;
126 int mean_ec; 126 int mean_ec;
127 int ec_sum; 127 int ec_sum;
128 int ec_count; 128 int ec_count;
129 }; 129 };
130 130
131 struct ubi_device; 131 struct ubi_device;
132 struct ubi_vid_hdr; 132 struct ubi_vid_hdr;
133 133
134 /* 134 /*
135 * ubi_scan_move_to_list - move a physical era 135 * ubi_scan_move_to_list - move a physical eraseblock from the volume tree to a
136 * list. 136 * list.
137 * 137 *
138 * @sv: volume scanning information 138 * @sv: volume scanning information
139 * @seb: scanning eraseblock infprmation 139 * @seb: scanning eraseblock infprmation
140 * @list: the list to move to 140 * @list: the list to move to
141 */ 141 */
142 static inline void ubi_scan_move_to_list(struc 142 static inline void ubi_scan_move_to_list(struct ubi_scan_volume *sv,
143 struc 143 struct ubi_scan_leb *seb,
144 struc 144 struct list_head *list)
145 { 145 {
146 rb_erase(&seb->u.rb, &sv->root 146 rb_erase(&seb->u.rb, &sv->root);
147 list_add_tail(&seb->u.list, li 147 list_add_tail(&seb->u.list, list);
148 } 148 }
149 149
150 int ubi_scan_add_used(struct ubi_device *ubi, 150 int ubi_scan_add_used(struct ubi_device *ubi, struct ubi_scan_info *si,
151 int pnum, int ec, const 151 int pnum, int ec, const struct ubi_vid_hdr *vid_hdr,
152 int bitflips); 152 int bitflips);
153 struct ubi_scan_volume *ubi_scan_find_sv(const 153 struct ubi_scan_volume *ubi_scan_find_sv(const struct ubi_scan_info *si,
154 int v 154 int vol_id);
155 struct ubi_scan_leb *ubi_scan_find_seb(const s 155 struct ubi_scan_leb *ubi_scan_find_seb(const struct ubi_scan_volume *sv,
156 int lnu 156 int lnum);
157 void ubi_scan_rm_volume(struct ubi_scan_info * 157 void ubi_scan_rm_volume(struct ubi_scan_info *si, struct ubi_scan_volume *sv);
158 struct ubi_scan_leb *ubi_scan_get_free_peb(str 158 struct ubi_scan_leb *ubi_scan_get_free_peb(struct ubi_device *ubi,
159 str 159 struct ubi_scan_info *si);
160 int ubi_scan_erase_peb(struct ubi_device *ubi, 160 int ubi_scan_erase_peb(struct ubi_device *ubi, const struct ubi_scan_info *si,
161 int pnum, int ec); 161 int pnum, int ec);
162 struct ubi_scan_info *ubi_scan(struct ubi_devi 162 struct ubi_scan_info *ubi_scan(struct ubi_device *ubi);
163 void ubi_scan_destroy_si(struct ubi_scan_info 163 void ubi_scan_destroy_si(struct ubi_scan_info *si);
164 164
165 #endif /* !__UBI_SCAN_H__ */ 165 #endif /* !__UBI_SCAN_H__ */
166 166
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