Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * JFFS2 -- Journalling Flash File System, Version 2. |
| 3 | * |
David Woodhouse | c00c310 | 2007-04-25 14:16:47 +0100 | [diff] [blame] | 4 | * Copyright © 2001-2007 Red Hat, Inc. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * Created by David Woodhouse <dwmw2@infradead.org> |
| 7 | * |
| 8 | * For licensing information, see the file 'LICENCE' in this directory. |
| 9 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
| 11 | |
| 12 | #ifndef __JFFS2_NODELIST_H__ |
| 13 | #define __JFFS2_NODELIST_H__ |
| 14 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/fs.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/jffs2.h> |
David Woodhouse | cbb9a56 | 2006-05-03 13:07:27 +0100 | [diff] [blame] | 18 | #include "jffs2_fs_sb.h" |
| 19 | #include "jffs2_fs_i.h" |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 20 | #include "xattr.h" |
| 21 | #include "acl.h" |
Ferenc Havasi | e631ddb | 2005-09-07 09:35:26 +0100 | [diff] [blame] | 22 | #include "summary.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
| 24 | #ifdef __ECOS |
| 25 | #include "os-ecos.h" |
| 26 | #else |
Artem B. Bityutskiy | 730554d | 2005-07-17 07:56:26 +0100 | [diff] [blame] | 27 | #include <linux/mtd/compatmac.h> /* For compatibility with older kernels */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include "os-linux.h" |
| 29 | #endif |
| 30 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #define JFFS2_NATIVE_ENDIAN |
| 32 | |
| 33 | /* Note we handle mode bits conversion from JFFS2 (i.e. Linux) to/from |
| 34 | whatever OS we're actually running on here too. */ |
| 35 | |
| 36 | #if defined(JFFS2_NATIVE_ENDIAN) |
| 37 | #define cpu_to_je16(x) ((jint16_t){x}) |
| 38 | #define cpu_to_je32(x) ((jint32_t){x}) |
| 39 | #define cpu_to_jemode(x) ((jmode_t){os_to_jffs2_mode(x)}) |
| 40 | |
David Woodhouse | 566865a | 2007-04-23 12:07:17 +0100 | [diff] [blame] | 41 | #define constant_cpu_to_je16(x) ((jint16_t){x}) |
| 42 | #define constant_cpu_to_je32(x) ((jint32_t){x}) |
| 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #define je16_to_cpu(x) ((x).v16) |
| 45 | #define je32_to_cpu(x) ((x).v32) |
| 46 | #define jemode_to_cpu(x) (jffs2_to_os_mode((x).m)) |
| 47 | #elif defined(JFFS2_BIG_ENDIAN) |
| 48 | #define cpu_to_je16(x) ((jint16_t){cpu_to_be16(x)}) |
| 49 | #define cpu_to_je32(x) ((jint32_t){cpu_to_be32(x)}) |
| 50 | #define cpu_to_jemode(x) ((jmode_t){cpu_to_be32(os_to_jffs2_mode(x))}) |
| 51 | |
David Woodhouse | 566865a | 2007-04-23 12:07:17 +0100 | [diff] [blame] | 52 | #define constant_cpu_to_je16(x) ((jint16_t){__constant_cpu_to_be16(x)}) |
| 53 | #define constant_cpu_to_je32(x) ((jint32_t){__constant_cpu_to_be32(x)}) |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #define je16_to_cpu(x) (be16_to_cpu(x.v16)) |
| 56 | #define je32_to_cpu(x) (be32_to_cpu(x.v32)) |
| 57 | #define jemode_to_cpu(x) (be32_to_cpu(jffs2_to_os_mode((x).m))) |
| 58 | #elif defined(JFFS2_LITTLE_ENDIAN) |
| 59 | #define cpu_to_je16(x) ((jint16_t){cpu_to_le16(x)}) |
| 60 | #define cpu_to_je32(x) ((jint32_t){cpu_to_le32(x)}) |
| 61 | #define cpu_to_jemode(x) ((jmode_t){cpu_to_le32(os_to_jffs2_mode(x))}) |
| 62 | |
David Woodhouse | 566865a | 2007-04-23 12:07:17 +0100 | [diff] [blame] | 63 | #define constant_cpu_to_je16(x) ((jint16_t){__constant_cpu_to_le16(x)}) |
| 64 | #define constant_cpu_to_je32(x) ((jint32_t){__constant_cpu_to_le32(x)}) |
| 65 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #define je16_to_cpu(x) (le16_to_cpu(x.v16)) |
| 67 | #define je32_to_cpu(x) (le32_to_cpu(x.v32)) |
| 68 | #define jemode_to_cpu(x) (le32_to_cpu(jffs2_to_os_mode((x).m))) |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 69 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | #error wibble |
| 71 | #endif |
| 72 | |
Artem B. Bityutskiy | 1e0da3c | 2005-08-01 13:05:22 +0100 | [diff] [blame] | 73 | /* The minimal node header size */ |
| 74 | #define JFFS2_MIN_NODE_HEADER sizeof(struct jffs2_raw_dirent) |
| 75 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | /* |
| 77 | This is all we need to keep in-core for each raw node during normal |
| 78 | operation. As and when we do read_inode on a particular inode, we can |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 79 | scan the nodes which are listed for it and build up a proper map of |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | which nodes are currently valid. JFFSv1 always used to keep that whole |
| 81 | map in core for each inode. |
| 82 | */ |
| 83 | struct jffs2_raw_node_ref |
| 84 | { |
| 85 | struct jffs2_raw_node_ref *next_in_ino; /* Points to the next raw_node_ref |
David Woodhouse | 987d47b | 2006-05-22 16:32:05 +0100 | [diff] [blame] | 86 | for this object. If this _is_ the last, it points to the inode_cache, |
| 87 | xattr_ref or xattr_datum instead. The common part of those structures |
| 88 | has NULL in the first word. See jffs2_raw_ref_to_ic() below */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | uint32_t flash_offset; |
David Woodhouse | 19e56ce | 2008-04-23 01:26:12 +0100 | [diff] [blame] | 90 | #undef TEST_TOTLEN |
David Woodhouse | ca89a51 | 2006-05-21 13:29:11 +0100 | [diff] [blame] | 91 | #ifdef TEST_TOTLEN |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | uint32_t __totlen; /* This may die; use ref_totlen(c, jeb, ) below */ |
David Woodhouse | ca89a51 | 2006-05-21 13:29:11 +0100 | [diff] [blame] | 93 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | }; |
| 95 | |
David Woodhouse | 9bfeb69 | 2006-05-26 21:19:05 +0100 | [diff] [blame] | 96 | #define REF_LINK_NODE ((int32_t)-1) |
| 97 | #define REF_EMPTY_NODE ((int32_t)-2) |
| 98 | |
| 99 | /* Use blocks of about 256 bytes */ |
| 100 | #define REFS_PER_BLOCK ((255/sizeof(struct jffs2_raw_node_ref))-1) |
| 101 | |
| 102 | static inline struct jffs2_raw_node_ref *ref_next(struct jffs2_raw_node_ref *ref) |
| 103 | { |
| 104 | ref++; |
| 105 | |
| 106 | /* Link to another block of refs */ |
| 107 | if (ref->flash_offset == REF_LINK_NODE) { |
| 108 | ref = ref->next_in_ino; |
| 109 | if (!ref) |
| 110 | return ref; |
| 111 | } |
| 112 | |
| 113 | /* End of chain */ |
| 114 | if (ref->flash_offset == REF_EMPTY_NODE) |
| 115 | return NULL; |
| 116 | |
| 117 | return ref; |
| 118 | } |
David Woodhouse | 99988f7 | 2006-05-24 09:04:17 +0100 | [diff] [blame] | 119 | |
David Woodhouse | 987d47b | 2006-05-22 16:32:05 +0100 | [diff] [blame] | 120 | static inline struct jffs2_inode_cache *jffs2_raw_ref_to_ic(struct jffs2_raw_node_ref *raw) |
| 121 | { |
David Woodhouse | 99988f7 | 2006-05-24 09:04:17 +0100 | [diff] [blame] | 122 | while(raw->next_in_ino) |
David Woodhouse | 987d47b | 2006-05-22 16:32:05 +0100 | [diff] [blame] | 123 | raw = raw->next_in_ino; |
David Woodhouse | 987d47b | 2006-05-22 16:32:05 +0100 | [diff] [blame] | 124 | |
| 125 | /* NB. This can be a jffs2_xattr_datum or jffs2_xattr_ref and |
| 126 | not actually a jffs2_inode_cache. Check ->class */ |
| 127 | return ((struct jffs2_inode_cache *)raw); |
| 128 | } |
| 129 | |
David Woodhouse | ef53cb0 | 2007-07-10 10:01:22 +0100 | [diff] [blame] | 130 | /* flash_offset & 3 always has to be zero, because nodes are |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | always aligned at 4 bytes. So we have a couple of extra bits |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 132 | to play with, which indicate the node's status; see below: */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | #define REF_UNCHECKED 0 /* We haven't yet checked the CRC or built its inode */ |
| 134 | #define REF_OBSOLETE 1 /* Obsolete, can be completely ignored */ |
| 135 | #define REF_PRISTINE 2 /* Completely clean. GC without looking */ |
| 136 | #define REF_NORMAL 3 /* Possibly overlapped. Read the page and write again on GC */ |
| 137 | #define ref_flags(ref) ((ref)->flash_offset & 3) |
| 138 | #define ref_offset(ref) ((ref)->flash_offset & ~3) |
| 139 | #define ref_obsolete(ref) (((ref)->flash_offset & 3) == REF_OBSOLETE) |
| 140 | #define mark_ref_normal(ref) do { (ref)->flash_offset = ref_offset(ref) | REF_NORMAL; } while(0) |
| 141 | |
David Woodhouse | 43dfa07 | 2007-06-29 13:39:57 +0100 | [diff] [blame] | 142 | /* Dirent nodes should be REF_PRISTINE only if they are not a deletion |
| 143 | dirent. Deletion dirents should be REF_NORMAL so that GC gets to |
| 144 | throw them away when appropriate */ |
| 145 | #define dirent_node_state(rd) ( (je32_to_cpu((rd)->ino)?REF_PRISTINE:REF_NORMAL) ) |
| 146 | |
David Woodhouse | 6171586 | 2006-05-21 00:02:06 +0100 | [diff] [blame] | 147 | /* NB: REF_PRISTINE for an inode-less node (ref->next_in_ino == NULL) indicates |
| 148 | it is an unknown node of type JFFS2_NODETYPE_RWCOMPAT_COPY, so it'll get |
| 149 | copied. If you need to do anything different to GC inode-less nodes, then |
| 150 | you need to modify gc.c accordingly. */ |
| 151 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | /* For each inode in the filesystem, we need to keep a record of |
| 153 | nlink, because it would be a PITA to scan the whole directory tree |
| 154 | at read_inode() time to calculate it, and to keep sufficient information |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 155 | in the raw_node_ref (basically both parent and child inode number for |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | dirent nodes) would take more space than this does. We also keep |
| 157 | a pointer to the first physical node which is part of this inode, too. |
| 158 | */ |
| 159 | struct jffs2_inode_cache { |
David Woodhouse | 987d47b | 2006-05-22 16:32:05 +0100 | [diff] [blame] | 160 | /* First part of structure is shared with other objects which |
| 161 | can terminate the raw node refs' next_in_ino list -- which |
| 162 | currently struct jffs2_xattr_datum and struct jffs2_xattr_ref. */ |
| 163 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | struct jffs2_full_dirent *scan_dents; /* Used during scan to hold |
| 165 | temporary lists of dirents, and later must be set to |
| 166 | NULL to mark the end of the raw_node_ref->next_in_ino |
| 167 | chain. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | struct jffs2_raw_node_ref *nodes; |
David Woodhouse | 987d47b | 2006-05-22 16:32:05 +0100 | [diff] [blame] | 169 | uint8_t class; /* It's used for identification */ |
| 170 | |
| 171 | /* end of shared structure */ |
| 172 | |
| 173 | uint8_t flags; |
| 174 | uint16_t state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | uint32_t ino; |
David Woodhouse | 987d47b | 2006-05-22 16:32:05 +0100 | [diff] [blame] | 176 | struct jffs2_inode_cache *next; |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 177 | #ifdef CONFIG_JFFS2_FS_XATTR |
KaiGai Kohei | 8f2b6f4 | 2006-05-13 15:15:07 +0900 | [diff] [blame] | 178 | struct jffs2_xattr_ref *xref; |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 179 | #endif |
David Woodhouse | 27c72b0 | 2008-05-01 18:47:17 +0100 | [diff] [blame] | 180 | uint32_t pino_nlink; /* Directories store parent inode |
| 181 | here; other inodes store nlink. |
| 182 | Zero always means that it's |
| 183 | completely unlinked. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | }; |
| 185 | |
| 186 | /* Inode states for 'state' above. We need the 'GC' state to prevent |
| 187 | someone from doing a read_inode() while we're moving a 'REF_PRISTINE' |
| 188 | node without going through all the iget() nonsense */ |
| 189 | #define INO_STATE_UNCHECKED 0 /* CRC checks not yet done */ |
| 190 | #define INO_STATE_CHECKING 1 /* CRC checks in progress */ |
| 191 | #define INO_STATE_PRESENT 2 /* In core */ |
| 192 | #define INO_STATE_CHECKEDABSENT 3 /* Checked, cleared again */ |
| 193 | #define INO_STATE_GC 4 /* GCing a 'pristine' node */ |
| 194 | #define INO_STATE_READING 5 /* In read_inode() */ |
David Woodhouse | 67e345d | 2005-02-27 23:01:36 +0000 | [diff] [blame] | 195 | #define INO_STATE_CLEARING 6 /* In clear_inode() */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 197 | #define INO_FLAGS_XATTR_CHECKED 0x01 /* has no duplicate xattr_ref */ |
| 198 | |
| 199 | #define RAWNODE_CLASS_INODE_CACHE 0 |
| 200 | #define RAWNODE_CLASS_XATTR_DATUM 1 |
| 201 | #define RAWNODE_CLASS_XATTR_REF 2 |
| 202 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | #define INOCACHE_HASHSIZE 128 |
| 204 | |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 205 | #define write_ofs(c) ((c)->nextblock->offset + (c)->sector_size - (c)->nextblock->free_size) |
| 206 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | /* |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 208 | Larger representation of a raw node, kept in-core only when the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | struct inode for this particular ino is instantiated. |
| 210 | */ |
| 211 | |
| 212 | struct jffs2_full_dnode |
| 213 | { |
| 214 | struct jffs2_raw_node_ref *raw; |
| 215 | uint32_t ofs; /* The offset to which the data of this node belongs */ |
| 216 | uint32_t size; |
| 217 | uint32_t frags; /* Number of fragments which currently refer |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 218 | to this node. When this reaches zero, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | the node is obsolete. */ |
| 220 | }; |
| 221 | |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 222 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | Even larger representation of a raw node, kept in-core only while |
| 224 | we're actually building up the original map of which nodes go where, |
| 225 | in read_inode() |
| 226 | */ |
| 227 | struct jffs2_tmp_dnode_info |
| 228 | { |
David Woodhouse | 9dee750 | 2005-07-05 22:03:10 +0100 | [diff] [blame] | 229 | struct rb_node rb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | struct jffs2_full_dnode *fn; |
| 231 | uint32_t version; |
Artem B. Bityutskiy | 1e0da3c | 2005-08-01 13:05:22 +0100 | [diff] [blame] | 232 | uint32_t data_crc; |
| 233 | uint32_t partial_crc; |
David Woodhouse | df8e96f | 2007-04-25 03:23:42 +0100 | [diff] [blame] | 234 | uint16_t csize; |
| 235 | uint16_t overlapped; |
| 236 | }; |
| 237 | |
| 238 | /* Temporary data structure used during readinode. */ |
| 239 | struct jffs2_readinode_info |
| 240 | { |
| 241 | struct rb_root tn_root; |
| 242 | struct jffs2_tmp_dnode_info *mdata_tn; |
| 243 | uint32_t highest_version; |
| 244 | uint32_t latest_mctime; |
| 245 | uint32_t mctime_ver; |
| 246 | struct jffs2_full_dirent *fds; |
| 247 | struct jffs2_raw_node_ref *latest_ref; |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 248 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
| 250 | struct jffs2_full_dirent |
| 251 | { |
| 252 | struct jffs2_raw_node_ref *raw; |
| 253 | struct jffs2_full_dirent *next; |
| 254 | uint32_t version; |
| 255 | uint32_t ino; /* == zero for unlink */ |
| 256 | unsigned int nhash; |
| 257 | unsigned char type; |
| 258 | unsigned char name[0]; |
| 259 | }; |
| 260 | |
| 261 | /* |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 262 | Fragments - used to build a map of which raw node to obtain |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | data from for each part of the ino |
| 264 | */ |
| 265 | struct jffs2_node_frag |
| 266 | { |
| 267 | struct rb_node rb; |
| 268 | struct jffs2_full_dnode *node; /* NULL for holes */ |
| 269 | uint32_t size; |
| 270 | uint32_t ofs; /* The offset to which this fragment belongs */ |
| 271 | }; |
| 272 | |
| 273 | struct jffs2_eraseblock |
| 274 | { |
| 275 | struct list_head list; |
| 276 | int bad_count; |
| 277 | uint32_t offset; /* of this block in the MTD */ |
| 278 | |
| 279 | uint32_t unchecked_size; |
| 280 | uint32_t used_size; |
| 281 | uint32_t dirty_size; |
| 282 | uint32_t wasted_size; |
| 283 | uint32_t free_size; /* Note that sector_size - free_size |
| 284 | is the address of the first free space */ |
David Woodhouse | 9bfeb69 | 2006-05-26 21:19:05 +0100 | [diff] [blame] | 285 | uint32_t allocated_refs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | struct jffs2_raw_node_ref *first_node; |
| 287 | struct jffs2_raw_node_ref *last_node; |
| 288 | |
| 289 | struct jffs2_raw_node_ref *gc_node; /* Next node to be garbage collected */ |
| 290 | }; |
| 291 | |
Ferenc Havasi | 4ce1f56 | 2005-08-31 14:51:04 +0100 | [diff] [blame] | 292 | static inline int jffs2_blocks_use_vmalloc(struct jffs2_sb_info *c) |
| 293 | { |
| 294 | return ((c->flash_size / c->sector_size) * sizeof (struct jffs2_eraseblock)) > (128 * 1024); |
| 295 | } |
| 296 | |
David Woodhouse | ca89a51 | 2006-05-21 13:29:11 +0100 | [diff] [blame] | 297 | #define ref_totlen(a, b, c) __jffs2_ref_totlen((a), (b), (c)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | #define ALLOC_NORMAL 0 /* Normal allocation */ |
| 300 | #define ALLOC_DELETION 1 /* Deletion node. Best to allow it */ |
| 301 | #define ALLOC_GC 2 /* Space requested for GC. Give it or die */ |
| 302 | #define ALLOC_NORETRY 3 /* For jffs2_write_dnode: On failure, return -EAGAIN instead of retrying */ |
| 303 | |
| 304 | /* How much dirty space before it goes on the very_dirty_list */ |
| 305 | #define VERYDIRTY(c, size) ((size) >= ((c)->sector_size / 2)) |
| 306 | |
| 307 | /* check if dirty space is more than 255 Byte */ |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 308 | #define ISDIRTY(size) ((size) > sizeof (struct jffs2_raw_inode) + JFFS2_MIN_DATA_LEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | |
| 310 | #define PAD(x) (((x)+3)&~3) |
| 311 | |
David Woodhouse | aef9ab4 | 2006-05-19 00:28:49 +0100 | [diff] [blame] | 312 | static inline int jffs2_encode_dev(union jffs2_device_node *jdev, dev_t rdev) |
| 313 | { |
| 314 | if (old_valid_dev(rdev)) { |
| 315 | jdev->old = cpu_to_je16(old_encode_dev(rdev)); |
| 316 | return sizeof(jdev->old); |
| 317 | } else { |
| 318 | jdev->new = cpu_to_je32(new_encode_dev(rdev)); |
| 319 | return sizeof(jdev->new); |
| 320 | } |
| 321 | } |
| 322 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | static inline struct jffs2_node_frag *frag_first(struct rb_root *root) |
| 324 | { |
Akinobu Mita | ea7415c | 2006-10-20 14:41:05 -0700 | [diff] [blame] | 325 | struct rb_node *node = rb_first(root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
| 327 | if (!node) |
| 328 | return NULL; |
Akinobu Mita | ea7415c | 2006-10-20 14:41:05 -0700 | [diff] [blame] | 329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | return rb_entry(node, struct jffs2_node_frag, rb); |
| 331 | } |
Artem B. Bityuckiy | 8557fd5 | 2005-04-09 11:47:03 +0100 | [diff] [blame] | 332 | |
| 333 | static inline struct jffs2_node_frag *frag_last(struct rb_root *root) |
| 334 | { |
Akinobu Mita | ea7415c | 2006-10-20 14:41:05 -0700 | [diff] [blame] | 335 | struct rb_node *node = rb_last(root); |
Artem B. Bityuckiy | 8557fd5 | 2005-04-09 11:47:03 +0100 | [diff] [blame] | 336 | |
| 337 | if (!node) |
| 338 | return NULL; |
Akinobu Mita | ea7415c | 2006-10-20 14:41:05 -0700 | [diff] [blame] | 339 | |
Artem B. Bityuckiy | 8557fd5 | 2005-04-09 11:47:03 +0100 | [diff] [blame] | 340 | return rb_entry(node, struct jffs2_node_frag, rb); |
| 341 | } |
| 342 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | #define frag_next(frag) rb_entry(rb_next(&(frag)->rb), struct jffs2_node_frag, rb) |
| 344 | #define frag_prev(frag) rb_entry(rb_prev(&(frag)->rb), struct jffs2_node_frag, rb) |
| 345 | #define frag_parent(frag) rb_entry(rb_parent(&(frag)->rb), struct jffs2_node_frag, rb) |
| 346 | #define frag_left(frag) rb_entry((frag)->rb.rb_left, struct jffs2_node_frag, rb) |
| 347 | #define frag_right(frag) rb_entry((frag)->rb.rb_right, struct jffs2_node_frag, rb) |
| 348 | #define frag_erase(frag, list) rb_erase(&frag->rb, list); |
| 349 | |
David Woodhouse | df8e96f | 2007-04-25 03:23:42 +0100 | [diff] [blame] | 350 | #define tn_next(tn) rb_entry(rb_next(&(tn)->rb), struct jffs2_tmp_dnode_info, rb) |
| 351 | #define tn_prev(tn) rb_entry(rb_prev(&(tn)->rb), struct jffs2_tmp_dnode_info, rb) |
| 352 | #define tn_parent(tn) rb_entry(rb_parent(&(tn)->rb), struct jffs2_tmp_dnode_info, rb) |
| 353 | #define tn_left(tn) rb_entry((tn)->rb.rb_left, struct jffs2_tmp_dnode_info, rb) |
| 354 | #define tn_right(tn) rb_entry((tn)->rb.rb_right, struct jffs2_tmp_dnode_info, rb) |
| 355 | #define tn_erase(tn, list) rb_erase(&tn->rb, list); |
| 356 | #define tn_last(list) rb_entry(rb_last(list), struct jffs2_tmp_dnode_info, rb) |
| 357 | #define tn_first(list) rb_entry(rb_first(list), struct jffs2_tmp_dnode_info, rb) |
| 358 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | /* nodelist.c */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | void jffs2_add_fd_to_list(struct jffs2_sb_info *c, struct jffs2_full_dirent *new, struct jffs2_full_dirent **list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | void jffs2_set_inocache_state(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, int state); |
| 362 | struct jffs2_inode_cache *jffs2_get_ino_cache(struct jffs2_sb_info *c, uint32_t ino); |
| 363 | void jffs2_add_ino_cache (struct jffs2_sb_info *c, struct jffs2_inode_cache *new); |
| 364 | void jffs2_del_ino_cache(struct jffs2_sb_info *c, struct jffs2_inode_cache *old); |
| 365 | void jffs2_free_ino_caches(struct jffs2_sb_info *c); |
| 366 | void jffs2_free_raw_node_refs(struct jffs2_sb_info *c); |
| 367 | struct jffs2_node_frag *jffs2_lookup_node_frag(struct rb_root *fragtree, uint32_t offset); |
| 368 | void jffs2_kill_fragtree(struct rb_root *root, struct jffs2_sb_info *c_delete); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | struct rb_node *rb_next(struct rb_node *); |
| 370 | struct rb_node *rb_prev(struct rb_node *); |
| 371 | void rb_replace_node(struct rb_node *victim, struct rb_node *new, struct rb_root *root); |
Artem B. Bityutskiy | f97117d | 2005-07-27 15:46:14 +0100 | [diff] [blame] | 372 | int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn); |
David Woodhouse | 61c4b23 | 2007-04-25 17:04:23 +0100 | [diff] [blame] | 373 | uint32_t jffs2_truncate_fragtree (struct jffs2_sb_info *c, struct rb_root *list, uint32_t size); |
David Woodhouse | 2f78540 | 2006-05-24 02:04:45 +0100 | [diff] [blame] | 374 | struct jffs2_raw_node_ref *jffs2_link_node_ref(struct jffs2_sb_info *c, |
| 375 | struct jffs2_eraseblock *jeb, |
| 376 | uint32_t ofs, uint32_t len, |
| 377 | struct jffs2_inode_cache *ic); |
David Woodhouse | ca89a51 | 2006-05-21 13:29:11 +0100 | [diff] [blame] | 378 | extern uint32_t __jffs2_ref_totlen(struct jffs2_sb_info *c, |
| 379 | struct jffs2_eraseblock *jeb, |
| 380 | struct jffs2_raw_node_ref *ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | |
| 382 | /* nodemgmt.c */ |
| 383 | int jffs2_thread_should_wake(struct jffs2_sb_info *c); |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 384 | int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, |
Ferenc Havasi | e631ddb | 2005-09-07 09:35:26 +0100 | [diff] [blame] | 385 | uint32_t *len, int prio, uint32_t sumsize); |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 386 | int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize, |
Ferenc Havasi | e631ddb | 2005-09-07 09:35:26 +0100 | [diff] [blame] | 387 | uint32_t *len, uint32_t sumsize); |
David Woodhouse | 2f78540 | 2006-05-24 02:04:45 +0100 | [diff] [blame] | 388 | struct jffs2_raw_node_ref *jffs2_add_physical_node_ref(struct jffs2_sb_info *c, |
| 389 | uint32_t ofs, uint32_t len, |
| 390 | struct jffs2_inode_cache *ic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | void jffs2_complete_reservation(struct jffs2_sb_info *c); |
| 392 | void jffs2_mark_node_obsolete(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *raw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | |
| 394 | /* write.c */ |
| 395 | int jffs2_do_new_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, uint32_t mode, struct jffs2_raw_inode *ri); |
| 396 | |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 397 | struct jffs2_full_dnode *jffs2_write_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
| 398 | struct jffs2_raw_inode *ri, const unsigned char *data, |
| 399 | uint32_t datalen, int alloc_mode); |
| 400 | struct jffs2_full_dirent *jffs2_write_dirent(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
| 401 | struct jffs2_raw_dirent *rd, const unsigned char *name, |
| 402 | uint32_t namelen, int alloc_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 404 | struct jffs2_raw_inode *ri, unsigned char *buf, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | uint32_t offset, uint32_t writelen, uint32_t *retlen); |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 406 | int jffs2_do_create(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, struct jffs2_inode_info *f, |
| 407 | struct jffs2_raw_inode *ri, const char *name, int namelen); |
| 408 | int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, const char *name, |
| 409 | int namelen, struct jffs2_inode_info *dead_f, uint32_t time); |
| 410 | int jffs2_do_link(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, uint32_t ino, |
| 411 | uint8_t type, const char *name, int namelen, uint32_t time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
| 413 | |
| 414 | /* readinode.c */ |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 415 | int jffs2_do_read_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | uint32_t ino, struct jffs2_raw_inode *latest_node); |
| 417 | int jffs2_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic); |
| 418 | void jffs2_do_clear_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f); |
| 419 | |
| 420 | /* malloc.c */ |
| 421 | int jffs2_create_slab_caches(void); |
| 422 | void jffs2_destroy_slab_caches(void); |
| 423 | |
| 424 | struct jffs2_full_dirent *jffs2_alloc_full_dirent(int namesize); |
| 425 | void jffs2_free_full_dirent(struct jffs2_full_dirent *); |
| 426 | struct jffs2_full_dnode *jffs2_alloc_full_dnode(void); |
| 427 | void jffs2_free_full_dnode(struct jffs2_full_dnode *); |
| 428 | struct jffs2_raw_dirent *jffs2_alloc_raw_dirent(void); |
| 429 | void jffs2_free_raw_dirent(struct jffs2_raw_dirent *); |
| 430 | struct jffs2_raw_inode *jffs2_alloc_raw_inode(void); |
| 431 | void jffs2_free_raw_inode(struct jffs2_raw_inode *); |
| 432 | struct jffs2_tmp_dnode_info *jffs2_alloc_tmp_dnode_info(void); |
| 433 | void jffs2_free_tmp_dnode_info(struct jffs2_tmp_dnode_info *); |
David Woodhouse | 9bfeb69 | 2006-05-26 21:19:05 +0100 | [diff] [blame] | 434 | int jffs2_prealloc_raw_node_refs(struct jffs2_sb_info *c, |
David Woodhouse | 046b8b9 | 2006-05-25 01:50:35 +0100 | [diff] [blame] | 435 | struct jffs2_eraseblock *jeb, int nr); |
David Woodhouse | 9bfeb69 | 2006-05-26 21:19:05 +0100 | [diff] [blame] | 436 | void jffs2_free_refblock(struct jffs2_raw_node_ref *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | struct jffs2_node_frag *jffs2_alloc_node_frag(void); |
| 438 | void jffs2_free_node_frag(struct jffs2_node_frag *); |
| 439 | struct jffs2_inode_cache *jffs2_alloc_inode_cache(void); |
| 440 | void jffs2_free_inode_cache(struct jffs2_inode_cache *); |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 441 | #ifdef CONFIG_JFFS2_FS_XATTR |
| 442 | struct jffs2_xattr_datum *jffs2_alloc_xattr_datum(void); |
| 443 | void jffs2_free_xattr_datum(struct jffs2_xattr_datum *); |
| 444 | struct jffs2_xattr_ref *jffs2_alloc_xattr_ref(void); |
| 445 | void jffs2_free_xattr_ref(struct jffs2_xattr_ref *); |
| 446 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | |
| 448 | /* gc.c */ |
| 449 | int jffs2_garbage_collect_pass(struct jffs2_sb_info *c); |
| 450 | |
| 451 | /* read.c */ |
| 452 | int jffs2_read_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
| 453 | struct jffs2_full_dnode *fd, unsigned char *buf, |
| 454 | int ofs, int len); |
| 455 | int jffs2_read_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
| 456 | unsigned char *buf, uint32_t offset, uint32_t len); |
| 457 | char *jffs2_getlink(struct jffs2_sb_info *c, struct jffs2_inode_info *f); |
| 458 | |
| 459 | /* scan.c */ |
| 460 | int jffs2_scan_medium(struct jffs2_sb_info *c); |
| 461 | void jffs2_rotate_lists(struct jffs2_sb_info *c); |
Ferenc Havasi | e631ddb | 2005-09-07 09:35:26 +0100 | [diff] [blame] | 462 | struct jffs2_inode_cache *jffs2_scan_make_ino_cache(struct jffs2_sb_info *c, uint32_t ino); |
| 463 | int jffs2_scan_classify_jeb(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb); |
David Woodhouse | 6827099 | 2006-05-21 03:46:05 +0100 | [diff] [blame] | 464 | int jffs2_scan_dirty_space(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | |
| 466 | /* build.c */ |
| 467 | int jffs2_do_mount_fs(struct jffs2_sb_info *c); |
| 468 | |
| 469 | /* erase.c */ |
| 470 | void jffs2_erase_pending_blocks(struct jffs2_sb_info *c, int count); |
David Woodhouse | c38c1b6 | 2006-05-25 01:38:27 +0100 | [diff] [blame] | 471 | void jffs2_free_jeb_node_refs(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
Andrew Victor | 2f82ce1 | 2005-02-09 09:24:26 +0000 | [diff] [blame] | 473 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | /* wbuf.c */ |
| 475 | int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino); |
| 476 | int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c); |
| 477 | int jffs2_check_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb); |
| 478 | int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb); |
| 479 | #endif |
| 480 | |
Artem B. Bityutskiy | 730554d | 2005-07-17 07:56:26 +0100 | [diff] [blame] | 481 | #include "debug.h" |
| 482 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | #endif /* __JFFS2_NODELIST_H__ */ |