src/viced/serialize_state.h

   1 /*
   2  * Copyright 2006, Sine Nomine Associates and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 /*
  11  * demand attach fs
  12  * fileserver state serialization
  13  */
  14
  15 #ifndef _AFS_TVICED_SERIALIZE_STATE_H
  16 #define _AFS_TVICED_SERIALIZE_STATE_H
  17
  18 #ifdef AFS_DEMAND_ATTACH_FS
  19
  20 #define FS_STATE_MAGIC 0x62FA841C
  21 #define FS_STATE_VERSION 2
  22
  23 #define HOST_STATE_MAGIC 0x7B8C9DAE
  24 #define HOST_STATE_VERSION 2
  25
  26 #define HOST_STATE_ENTRY_MAGIC 0xA8B9CADB
  27
  28 #define CALLBACK_STATE_MAGIC 0x89DE67BC
  29 #define CALLBACK_STATE_VERSION 1
  30
  31 #define CALLBACK_STATE_TIMEOUT_MAGIC 0x99DD5511
  32 #define CALLBACK_STATE_FEHASH_MAGIC 0x77BB33FF
  33 #define CALLBACK_STATE_ENTRY_MAGIC 0x54637281
  34
  35 #define ACTIVE_VOLUME_STATE_MAGIC 0xAC7557CA
  36 #define ACTIVE_VOLUME_STATE_VERSION 1
  37
  38 #define ACTIVE_VOLUME_STATE_AVEHASH_MAGIC 0xBADDF00D
  39
  40 #define HOST_STATE_VALID_WINDOW 1800 /* 30 minutes */
  41
  42 /* values for the 'valid' field in idx_map_entry_t */
  43 #define FS_STATE_IDX_VALID 1
  44 #define FS_STATE_IDX_SKIPPED 2
  45
  46 /*
  47  * on-disk structures
  48  */
  49 struct disk_version_stamp {
  50     afs_uint32 magic;
  51     afs_uint32 version;
  52 };
  53
  54 /* 1024 byte header structure */
  55 struct fs_state_header {
  56     struct disk_version_stamp stamp;  /* version stamp */
  57     time_t timestamp;                 /* timestamp of save */
  58     afs_uint32 sys_name;              /* sys name id for this machine */
  59     afsUUID server_uuid;              /* server's UUID */
  60     byte valid;                       /* whether header contents are valid */
  61     byte endianness;                  /* endianness sanity check (0 for LE, 1 for BE) */
  62     byte stats_detailed;              /* fs stats detailed sanity check */
  63     byte padding1[1];                 /* padding */
  64     afs_uint32 reserved1[23];         /* for expansion */
  65     afs_uint64 avol_offset;           /* offset of active volumes structure */
  66     afs_uint64 h_offset;              /* offset of host_state_header structure */
  67     afs_uint64 cb_offset;             /* offset of callback_state_header structure */
  68     afs_uint64 vlru_offset;           /* offset of vlru state structure */
  69     afs_uint32 reserved2[56];         /* for expansion */
  70     char server_version_string[128];  /* version string from AFS_component_version_number.c */
  71     afs_uint32 reserved3[128];        /* for expansion */
  72 };
  73
  74 /*
  75  * host package serialization
  76  */
  77
  78 /* 256 byte header for the host state data */
  79 struct host_state_header {
  80     struct disk_version_stamp stamp;  /* host state version stamp */
  81     afs_uint32 records;               /* number of stored host records */
  82     afs_uint32 index_max;             /* max index value encountered */
  83     afs_uint32 reserved[60];          /* for expansion */
  84 };
  85
  86 /* 32 byte host entry header */
  87 struct host_state_entry_header {
  88     afs_uint32 magic;         /* stamp */
  89     afs_uint32 len;           /* number of bytes in this record */
  90     afs_uint32 interfaces;    /* number of interfaces included in record */
  91     afs_uint32 hcps;          /* number of hcps entries in record */
  92     afs_uint32 reserved[4];
  93 };
  94
  95 /* 36 byte host entry structure */
  96 struct hostDiskEntry {
  97     afs_uint32 host;            /* IP address of host interface that is
  98                                  * currently being used, in network
  99                                  * byte order */
 100     afs_uint16 port;            /* port address of host */
 101     afs_uint16 hostFlags;       /*  bit map */
 102     byte Console;               /* XXXX This host is a console */
 103     byte hcpsfailed;            /* Retry the cps call next time */
 104     byte hcps_valid;            /* prlist_val not null */
 105     byte InSameNetwork;         /*Is host's addr in the same network as
 106                                  * the File Server's? */
 107     afs_uint32 hcps_len;        /* length of hcps */
 108     afs_uint32 LastCall;        /* time of last call from host */
 109     afs_uint32 ActiveCall;      /* time of any call but gettime */
 110     afs_uint32 cpsCall;         /* time of last cps call from this host */
 111     afs_uint32 cblist;          /* Call back list for this host */
 112     afs_uint32 index;           /* index for correlating w/ callback dumps */
 113 };
 114
 115 /*
 116  * callback package serialization
 117  */
 118
 119 /* 512 byte header */
 120 struct callback_state_header {
 121     struct disk_version_stamp stamp;    /* callback state version stamp */
 122     afs_uint32 nFEs;                    /* number of FileEntry records */
 123     afs_uint32 nCBs;                    /* number of CallBack records */
 124     afs_uint32 fe_max;                  /* max FileEntry index */
 125     afs_uint32 cb_max;                  /* max CallBack index */
 126     afs_int32 tfirst;                   /* first valid timeout */
 127     afs_uint32 reserved[115];           /* for expansion */
 128     afs_uint64 timeout_offset;          /* offset of timeout queue heads */
 129     afs_uint64 fehash_offset;           /* offset of file entry hash buckets */
 130     afs_uint64 fe_offset;               /* offset of first file entry */
 131 };
 132
 133 /* 32 byte header */
 134 struct callback_state_timeout_header {
 135     afs_uint32 magic;         /* magic number for timeout header */
 136     afs_uint32 len;           /* total length of header and timeout records */
 137     afs_uint32 records;       /* number of timeout records */
 138     afs_uint32 reserved[5];
 139 };
 140
 141 /* 32 byte header */
 142 struct callback_state_fehash_header {
 143     afs_uint32 magic;         /* magic number for fehash header */
 144     afs_uint32 len;           /* total length of header and fehash bucket heads */
 145     afs_uint32 records;       /* number of hash buckets */
 146     afs_uint32 reserved[5];
 147 };
 148
 149 /* 32 byte header */
 150 struct callback_state_entry_header {
 151     afs_uint32 magic;         /* magic number for FE entry */
 152     afs_uint32 len;           /* number of bytes in this record */
 153     afs_uint32 nCBs;          /* number of callbacks for this FE */
 154     afs_uint32 reserved[5];
 155 };
 156
 157 struct FEDiskEntry {
 158     struct FileEntry fe;
 159     afs_uint32 index;
 160 };
 161
 162 struct CBDiskEntry {
 163     struct CallBack cb;
 164     afs_uint32 index;
 165 };
 166
 167 /*
 168  * active volumes state serialization
 169  *
 170  * these structures are meant to support
 171  * automated salvaging of active volumes
 172  * in the event of a fileserver crash
 173  */
 174
 175 /* 512 byte header */
 176 struct active_volume_state_header {
 177     struct disk_version_stamp stamp;    /* callback state version stamp */
 178     afs_uint32 nAVEs;                   /* number of ActiveVolumeEntry records */
 179     afs_uint32 init_timestamp;          /* timestamp of AVE initialization */
 180     afs_uint32 update_timetamp;         /* timestamp of last AVE update */
 181     afs_uint32 reserved[119];           /* for expansion */
 182     afs_uint64 avehash_offset;          /* offset of active volume entry hash buckets */
 183     afs_uint64 ave_offset;              /* offset of first active volume entry */
 184 };
 185
 186 /* 32 byte header */
 187 struct active_volume_state_avehash_header {
 188     afs_uint32 magic;         /* magic number for avehash header */
 189     afs_uint32 len;           /* total length of header and avehash bucket heads */
 190     afs_uint32 records;       /* number of hash buckets */
 191     afs_uint32 reserved[5];
 192 };
 193
 194 typedef afs_uint32 active_volume_state_avehash_entry;
 195
 196 /* active volume entry */
 197 struct AVDiskEntry {
 198     VolumeId volume;
 199     afs_uint32 partition;
 200     afs_uint32 hash_next;
 201 };
 202
 203
 204 /*
 205  * dump runtime state
 206  */
 207 struct idx_map_entry_t {
 208     byte valid;                            /* whether or not this entry has been populated */
 209     afs_uint32 old_idx;                    /* host hash id from last runtime */
 210     afs_uint32 new_idx;                    /* host hash id for this runtime */
 211 };
 212
 213
 214 /* verification process sanity check constants
 215  *
 216  * make them fairly large so we don't get
 217  * false positives
 218  */
 219 #define FS_STATE_H_MAX_UUID_HASH_CHAIN_LEN    100000     /* max elements in a host uuid-hash chain */
 220 #define FS_STATE_H_MAX_ADDR_HASH_CHAIN_LEN    2000000    /* max elements in a host ipv4-hash chain */
 221 #define FS_STATE_FE_MAX_HASH_CHAIN_LEN        100000     /* max elements in a FE fid-hash chain */
 222 #define FS_STATE_FCB_MAX_LIST_LEN             100000     /* max elements in a per-FE CB list */
 223 #define FS_STATE_HCB_MAX_LIST_LEN             100000     /* max elements in a per-host CB list */
 224 #define FS_STATE_TCB_MAX_LIST_LEN             100000     /* max elements in a per-timeout CB list */
 225
 226
 227 /*
 228  * main state serialization state structure
 229  */
 230
 231 struct fs_dump_state {
 232     enum {
 233         FS_STATE_DUMP_MODE,
 234         FS_STATE_LOAD_MODE
 235     } mode;
 236     struct {
 237         byte do_host_restore;              /* whether host restore should be done */
 238         byte some_steps_skipped;           /* whether some steps were skipped */
 239         byte warnings_generated;           /* whether any warnings were generated during restore */
 240     } flags;
 241     afs_fsize_t file_len;
 242     int fd;                                /* fd of the current dump file */
 243     int bail;                              /* non-zero if something went wrong */
 244     char * fn;                             /* name of the current dump file */
 245     struct {                               /* memory map of dump file */
 246         void * map;
 247         void * cursor;
 248         afs_foff_t offset;
 249         afs_fsize_t size;
 250     } mmap;
 251     struct fs_state_header * hdr;          /* main header */
 252     struct host_state_header * h_hdr;      /* header for host state data */
 253     struct callback_state_header * cb_hdr; /* header for callback state data */
 254     struct callback_state_timeout_header * cb_timeout_hdr;
 255     struct callback_state_fehash_header * cb_fehash_hdr;
 256     afs_uint64 eof_offset;                 /* current end of file offset */
 257     struct {
 258         int len;                           /* number of host entries in map */
 259         struct idx_map_entry_t * entries;
 260     } h_map;
 261     struct {
 262         int len;
 263         struct idx_map_entry_t * entries;
 264     } fe_map;
 265     struct {
 266         int len;
 267         struct idx_map_entry_t * entries;
 268     } cb_map;
 269 };
 270
 271 /* prototypes */
 272
 273 /* serialize_state.c */
 274 extern int fs_stateFileOpen(struct fs_dump_state *state);
 275 extern int fs_stateWrite(struct fs_dump_state * state,
 276                          void * buf, size_t len);
 277 extern int fs_stateRead(struct fs_dump_state * state,
 278                         void * buf, size_t len);
 279 extern int fs_stateWriteV(struct fs_dump_state * state,
 280                           struct iovec * iov, int niov);
 281 extern int fs_stateReadV(struct fs_dump_state * state,
 282                          struct iovec * iov, int niov);
 283 extern int fs_stateSync(struct fs_dump_state * state);
 284 extern int fs_stateWriteHeader(struct fs_dump_state * state,
 285                                afs_uint64 * offset,
 286                                void * hdr, size_t len);
 287 extern int fs_stateReadHeader(struct fs_dump_state * state,
 288                               afs_uint64 * offset,
 289                               void * hdr, size_t len);
 290 extern int fs_stateIncEOF(struct fs_dump_state * state,
 291                           afs_int32 len);
 292 extern int fs_stateSeek(struct fs_dump_state * state,
 293                         afs_uint64 * offset);
 294
 295 /* host.c */
 296 extern int h_stateSave(struct fs_dump_state * state);
 297 extern int h_stateRestore(struct fs_dump_state * state);
 298 extern int h_stateRestoreIndices(struct fs_dump_state * state);
 299 extern int h_stateVerify(struct fs_dump_state * state);
 300 extern int h_OldToNew(struct fs_dump_state * state, afs_uint32 old, afs_uint32 * new);
 301
 302 /* callback.c */
 303 extern int cb_stateSave(struct fs_dump_state * state);
 304 extern int cb_stateRestore(struct fs_dump_state * state);
 305 extern int cb_stateRestoreIndices(struct fs_dump_state * state);
 306 extern int cb_stateVerify(struct fs_dump_state * state);
 307 extern int cb_stateVerifyHCBList(struct fs_dump_state * state, struct host * host);
 308 extern int fe_OldToNew(struct fs_dump_state * state, afs_uint32 old, afs_uint32 * new);
 309 extern int cb_OldToNew(struct fs_dump_state * state, afs_uint32 old, afs_uint32 * new);
 310
 311 #endif /* AFS_DEMAND_ATTACH_FS */
 312 #endif /* _AFS_TVICED_SERIALIZE_STATE_H */