/* SPDX-License-Identifier: GPL-2.0-only */
/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation
*
* Authors: Artem Bityutskiy (Битюцкий Артём)
* Adrian Hunter
*/
#ifndef __UBIFS_H__
#define __UBIFS_H__
#include <string.h>
#include "linux_types.h"
#include "list.h"
#include "rbtree.h"
#include "spinlock.h"
#include "mutex.h"
#include "rwsem.h"
#include "atomic.h"
#include "libubi.h"
#include "ubifs-media.h"
/* Number of UBIFS blocks per VFS page */
#define UBIFS_BLOCKS_PER_PAGE (PAGE_SIZE / UBIFS_BLOCK_SIZE)
#define UBIFS_BLOCKS_PER_PAGE_SHIFT (PAGE_SHIFT - UBIFS_BLOCK_SHIFT)
/* "File system end of life" sequence number watermark */
#define SQNUM_WARN_WATERMARK 0xFFFFFFFF00000000ULL
#define SQNUM_WATERMARK 0xFFFFFFFFFF000000ULL
/*
* Minimum amount of LEBs reserved for the index. At present the index needs at
* least 2 LEBs: one for the index head and one for in-the-gaps method (which
* currently does not cater for the index head and so excludes it from
* consideration).
*/
#define MIN_INDEX_LEBS 2
/* Maximum logical eraseblock size in bytes */
#define UBIFS_MAX_LEB_SZ (2*1024*1024)
/* Minimum amount of data UBIFS writes to the flash */
#define MIN_WRITE_SZ (UBIFS_DATA_NODE_SZ + 8)
/*
* Currently we do not support inode number overlapping and re-using, so this
* watermark defines dangerous inode number level. This should be fixed later,
* although it is difficult to exceed current limit. Another option is to use
* 64-bit inode numbers, but this means more overhead.
*/
#define INUM_WARN_WATERMARK 0xFFF00000
#define INUM_WATERMARK 0xFFFFFF00
/* Maximum number of entries in each LPT (LEB category) heap */
#define LPT_HEAP_SZ 256
/* Maximum possible inode number (only 32-bit inodes are supported now) */
#define MAX_INUM 0xFFFFFFFF
/* Number of non-data journal heads */
#define NONDATA_JHEADS_CNT 2
/* Shorter names for journal head numbers for internal usage */
#define GCHD UBIFS_GC_HEAD
#define BASEHD UBIFS_BASE_HEAD
#define DATAHD UBIFS_DATA_HEAD
/* 'No change' value for 'ubifs_change_lp()' */
#define LPROPS_NC 0x80000001
/*
* There is no notion of truncation key because truncation nodes do not exist
* in TNC. However, when replaying, it is handy to introduce fake "truncation"
* keys for truncation nodes because the code becomes simpler. So we define
* %UBIFS_TRUN_KEY type.
*
* But otherwise, out of the journal reply scope, the truncation keys are
* invalid.
*/
#define UBIFS_TRUN_KEY UBIFS_KEY_TYPES_CNT
#define UBIFS_INVALID_KEY UBIFS_KEY_TYPES_CNT
/*
* How much a directory entry/extended attribute entry adds to the parent/host
* inode.
*/
#define CALC_DENT_SIZE(name_len) ALIGN(UBIFS_DENT_NODE_SZ + (name_len) + 1, 8)
/* How much an extended attribute adds to the host inode */
#define CALC_XATTR_BYTES(data_len) ALIGN(UBIFS_INO_NODE_SZ + (data_len) + 1, 8)
/* Maximum expected tree height for use by bottom_up_buf */
#define BOTTOM_UP_HEIGHT 64
#define UBIFS_HASH_ARR_SZ UBIFS_MAX_HASH_LEN
#define UBIFS_HMAC_ARR_SZ UBIFS_MAX_HMAC_LEN
/*
* Znode flags (actually, bit numbers which store the flags).
*
* DIRTY_ZNODE: znode is dirty
* COW_ZNODE: znode is being committed and a new instance of this znode has to
* be created before changing this znode
* OBSOLETE_ZNODE: znode is obsolete, which means it was deleted, but it is
* still in the commit list and the ongoing commit operation
* will commit it, and delete this znode after it is done
*/
enum {
DIRTY_ZNODE = 0,
COW_ZNODE = 1,
OBSOLETE_ZNODE = 2,
};
/*
* Commit states.
*
* COMMIT_RESTING: commit is not wanted
* COMMIT_BACKGROUND: background commit has been requested
* COMMIT_REQUIRED: commit is required
* COMMIT_RUNNING_BACKGROUND: background commit is running
* COMMIT_RUNNING_REQUIRED: commit is running and it is required
* COMMIT_BROKEN: commit failed
*/
enum {
COMMIT_RESTING = 0,
COMMIT_BACKGROUND,
COMMIT_REQUIRED,
COMMIT_RUNNING_BACKGROUND,
COMMIT_RUNNING_REQUIRED,
COMMIT_BROKEN,
};
/*
* 'ubifs_scan_a_node()' return values.
*
* SCANNED_GARBAGE: scanned garbage
* SCANNED_EMPTY_SPACE: scanned empty space
* SCANNED_A_NODE: scanned a valid node
* SCANNED_A_CORRUPT_NODE: scanned a corrupted node
* SCANNED_A_BAD_PAD_NODE: scanned a padding node with invalid pad length
*
* Greater than zero means: 'scanned that number of padding bytes'
*/
enum {
SCANNED_GARBAGE = 0,
SCANNED_EMPTY_SPACE = -1,
SCANNED_A_NODE = -2,
SCANNED_A_CORRUPT_NODE = -3,
SCANNED_A_BAD_PAD_NODE = -4,
};
/*
* LPT cnode flag bits.
*
* DIRTY_CNODE: cnode is dirty
* OBSOLETE_CNODE: cnode is being committed and has been copied (or deleted),
* so it can (and must) be freed when the commit is finished
* COW_CNODE: cnode is being committed and must be copied before writing
*/
enum {
DIRTY_CNODE = 0,
OBSOLETE_CNODE = 1,
COW_CNODE = 2,
};
/*
* Dirty flag bits (lpt_drty_flgs) for LPT special nodes.
*
* LTAB_DIRTY: ltab node is dirty
* LSAVE_DIRTY: lsave node is dirty
*/
enum {
LTAB_DIRTY = 1,
LSAVE_DIRTY = 2,
};
/*
* Return codes used by the garbage collector.
* @LEB_FREED: the logical eraseblock was freed and is ready to use
* @LEB_FREED_IDX: indexing LEB was freed and can be used only after the commit
* @LEB_RETAINED: the logical eraseblock was freed and retained for GC purposes
*/
enum {
LEB_FREED,
LEB_FREED_IDX,
LEB_RETAINED,
};
/**
* struct ubifs_old_idx - index node obsoleted since last commit start.
* @rb: rb-tree node
* @lnum: LEB number of obsoleted index node
* @offs: offset of obsoleted index node
*/
struct ubifs_old_idx {
struct rb_node rb;
int lnum;
int offs;
};
/* The below union makes it easier to deal with keys */
union ubifs_key {
uint8_t u8[UBIFS_SK_LEN];
uint32_t u32[UBIFS_SK_LEN/4];
uint64_t u64[UBIFS_SK_LEN/8];
__le32 j32[UBIFS_SK_LEN/4];
};
/**
* struct ubifs_scan_node - UBIFS scanned node information.
* @list: list of scanned nodes
* @key: key of node scanned (if it has one)
* @sqnum: sequence number
* @type: type of node scanned
* @offs: offset with LEB of node scanned
* @len: length of node scanned
* @node: raw node
*/
struct ubifs_scan_node {
struct list_head list;
union ubifs_key key;
unsigned long long sqnum;
int type;
int offs;
int len;
void *node;
};
/**
* struct ubifs_scan_leb - UBIFS scanned LEB information.
* @lnum: logical eraseblock number
* @nodes_cnt: number of nodes scanned
* @nodes: list of struct ubifs_scan_node
* @endpt: end point (and therefore the start of empty space)
* @buf: buffer containing entire LEB scanned
*/
struct ubifs_scan_leb {
int lnum;
int nodes_cnt;
struct list_head nodes;
int endpt;
void *buf;
};
/**
* struct ubifs_gced_idx_leb - garbage-collected indexing LEB.
* @list: list
* @lnum: LEB number
* @unmap: OK to unmap this LEB
*
* This data structure is used to temporary store garbage-collected indexing
* LEBs - they are not released immediately, but only after the next commit.
* This is needed to guarantee recoverability.
*/
struct ubifs_gced_idx_leb {
struct list_head list;
int lnum;
int unmap;
};
/**
* struct ubifs_inode - UBIFS in-memory inode description.
* @creat_sqnum: sequence number at time of creation
* @xattr_size: summarized size of all extended attributes in bytes
* @xattr_cnt: count of extended attributes this inode has
* @xattr_names: sum of lengths of all extended attribute names belonging to
* this inode
* @ui_size: inode size used by UBIFS when writing to flash
* @flags: inode flags (@UBIFS_COMPR_FL, etc)
* @compr_type: default compression type used for this inode
* @data_len: length of the data attached to the inode
* @data: inode's data
*/
struct ubifs_inode {
unsigned long long creat_sqnum;
unsigned int xattr_size;
unsigned int xattr_cnt;
unsigned int xattr_names;
unsigned int compr_type:2;
loff_t ui_size;
int flags;
int data_len;
void *data;
};
/**
* struct ubifs_unclean_leb - records a LEB recovered under read-only mode.
* @list: list
* @lnum: LEB number of recovered LEB
* @endpt: offset where recovery ended
*
* This structure records a LEB identified during recovery that needs to be
* cleaned but was not because UBIFS was mounted read-only. The information
* is used to clean the LEB when remounting to read-write mode.
*/
struct ubifs_unclean_leb {
struct list_head list;
int lnum;
int endpt;
};
/*
* LEB properties flags.
*
* LPROPS_UNCAT: not categorized
* LPROPS_DIRTY: dirty > free, dirty >= @c->dead_wm, not index
* LPROPS_DIRTY_IDX: dirty + free > @c->min_idx_node_sze and index
* LPROPS_FREE: free > 0, dirty < @c->dead_wm, not empty, not index
* LPROPS_HEAP_CNT: number of heaps used for storing categorized LEBs
* LPROPS_EMPTY: LEB is empty, not taken
* LPROPS_FREEABLE: free + dirty == leb_size, not index, not taken
* LPROPS_FRDI_IDX: free + dirty == leb_size and index, may be taken
* LPROPS_CAT_MASK: mask for the LEB categories above
* LPROPS_TAKEN: LEB was taken (this flag is not saved on the media)
* LPROPS_INDEX: LEB contains indexing nodes (this flag also exists on flash)
*/
enum {
LPROPS_UNCAT = 0,
LPROPS_DIRTY = 1,
LPROPS_DIRTY_IDX = 2,
LPROPS_FREE = 3,
LPROPS_HEAP_CNT = 3,
LPROPS_EMPTY = 4,
LPROPS_FREEABLE = 5,
LPROPS_FRDI_IDX = 6,
LPROPS_CAT_MASK = 15,
LPROPS_TAKEN = 16,
LPROPS_INDEX = 32,
};
/**
* struct ubifs_lprops - logical eraseblock properties.
* @free: amount of free space in bytes
* @dirty: amount of dirty space in bytes
* @flags: LEB properties flags (see above)
* @lnum: LEB number
* @end: the end postition of LEB calculated by the last node
* @used: amount of used space in bytes
* @list: list of same-category lprops (for LPROPS_EMPTY and LPROPS_FREEABLE)
* @hpos: heap position in heap of same-category lprops (other categories)
*/
struct ubifs_lprops {
int free;
int dirty;
int flags;
int lnum;
int end;
int used;
union {
struct list_head list;
int hpos;
};
};
/**
* struct ubifs_lpt_lprops - LPT logical eraseblock properties.
* @free: amount of free space in bytes
* @dirty: amount of dirty space in bytes
* @tgc: trivial GC flag (1 => unmap after commit end)
* @cmt: commit flag (1 => reserved for commit)
*/
struct ubifs_lpt_lprops {
int free;
int dirty;
unsigned tgc:1;
unsigned cmt:1;
};
/**
* struct ubifs_lp_stats - statistics of eraseblocks in the main area.
* @empty_lebs: number of empty LEBs
* @taken_empty_lebs: number of taken LEBs
* @idx_lebs: number of indexing LEBs
* @total_free: total free space in bytes (includes all LEBs)
* @total_dirty: total dirty space in bytes (includes all LEBs)
* @total_used: total used space in bytes (does not include index LEBs)
* @total_dead: total dead space in bytes (does not include index LEBs)
* @total_dark: total dark space in bytes (does not include index LEBs)
*
* The @taken_empty_lebs field counts the LEBs that are in the transient state
* of having been "taken" for use but not yet written to. @taken_empty_lebs is
* needed to account correctly for @gc_lnum, otherwise @empty_lebs could be
* used by itself (in which case 'unused_lebs' would be a better name). In the
* case of @gc_lnum, it is "taken" at mount time or whenever a LEB is retained
* by GC, but unlike other empty LEBs that are "taken", it may not be written
* straight away (i.e. before the next commit start or unmount), so either
* @gc_lnum must be specially accounted for, or the current approach followed
* i.e. count it under @taken_empty_lebs.
*
* @empty_lebs includes @taken_empty_lebs.
*
* @total_used, @total_dead and @total_dark fields do not account indexing
* LEBs.
*/
struct ubifs_lp_stats {
int empty_lebs;
int taken_empty_lebs;
int idx_lebs;
long long total_free;
long long total_dirty;
long long total_used;
long long total_dead;
long long total_dark;
};
struct ubifs_nnode;
/**
* struct ubifs_cnode - LEB Properties Tree common node.
* @parent: parent nnode
* @cnext: next cnode to commit
* @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE)
* @iip: index in parent
* @level: level in the tree (zero for pnodes, greater than zero for nnodes)
* @num: node number
*/
struct ubifs_cnode {
struct ubifs_nnode *parent;
struct ubifs_cnode *cnext;
unsigned long flags;
int iip;
int level;
int num;
};
/**
* struct ubifs_pnode - LEB Properties Tree leaf node.
* @parent: parent nnode
* @cnext: next cnode to commit
* @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE)
* @iip: index in parent
* @level: level in the tree (always zero for pnodes)
* @num: node number
* @lprops: LEB properties array
*/
struct ubifs_pnode {
struct ubifs_nnode *parent;
struct ubifs_cnode *cnext;
unsigned long flags;
int iip;
int level;
int num;
struct ubifs_lprops lprops[UBIFS_LPT_FANOUT];
};
/**
* struct ubifs_nbranch - LEB Properties Tree internal node branch.
* @lnum: LEB number of child
* @offs: offset of child
* @nnode: nnode child
* @pnode: pnode child
* @cnode: cnode child
*/
struct ubifs_nbranch {
int lnum;
int offs;
union {
struct ubifs_nnode *nnode;
struct ubifs_pnode *pnode;
struct ubifs_cnode *cnode;
};
};
/**
* struct ubifs_nnode - LEB Properties Tree internal node.
* @parent: parent nnode
* @cnext: next cnode to commit
* @flags: flags (%DIRTY_LPT_NODE or %OBSOLETE_LPT_NODE)
* @iip: index in parent
* @level: level in the tree (always greater than zero for nnodes)
* @num: node number
* @nbranch: branches to child nodes
*/
struct ubifs_nnode {
struct ubifs_nnode *parent;
struct ubifs_cnode *cnext;
unsigned long flags;
int iip;
int level;
int num;
struct ubifs_nbranch nbranch[UBIFS_LPT_FANOUT];
};
/**
* struct ubifs_lpt_heap - heap of categorized lprops.
* @arr: heap array
* @cnt: number in heap
* @max_cnt: maximum number allowed in heap
*
* There are %LPROPS_HEAP_CNT heaps.
*/
struct ubifs_lpt_heap {
struct ubifs_lprops **arr;
int cnt;
int max_cnt;
};
/*
* Return codes for LPT scan callback function.
*
* LPT_SCAN_CONTINUE: continue scanning
* LPT_SCAN_ADD: add the LEB properties scanned to the tree in memory
* LPT_SCAN_STOP: stop scanning
*/
enum {
LPT_SCAN_CONTINUE = 0,
LPT_SCAN_ADD = 1,
LPT_SCAN_STOP = 2,
};
struct ubifs_info;
/* Callback used by the 'ubifs_lpt_scan_nolock()' function */
typedef int (*ubifs_lpt_scan_callback)(struct ubifs_info *c,
const struct ubifs_lprops *lprops,
int in_tree, void *data);
/**
* struct ubifs_wbuf - UBIFS write-buffer.
* @c: UBIFS file-system description object
* @buf: write-buffer (of min. flash I/O unit size)
* @lnum: logical eraseblock number the write-buffer points to
* @offs: write-buffer offset in this logical eraseblock
* @avail: number of bytes available in the write-buffer
* @used: number of used bytes in the write-buffer
* @size: write-buffer size (in [@c->min_io_size, @c->max_write_size] range)
* @jhead: journal head the mutex belongs to (note, needed only to shut lockdep
* up by 'mutex_lock_nested()).
* @sync_callback: write-buffer synchronization callback
* @io_mutex: serializes write-buffer I/O
* @lock: serializes @buf, @lnum, @offs, @avail, @used, @next_ino and @inodes
* fields
* @next_ino: points to the next position of the following inode number
* @inodes: stores the inode numbers of the nodes which are in wbuf
*
* The write-buffer synchronization callback is called when the write-buffer is
* synchronized in order to notify how much space was wasted due to
* write-buffer padding and how much free space is left in the LEB.
*
* Note: the fields @buf, @lnum, @offs, @avail and @used can be read under
* spin-lock or mutex because they are written under both mutex and spin-lock.
* @buf is appended to under mutex but overwritten under both mutex and
* spin-lock. Thus the data between @buf and @buf + @used can be read under
* spinlock.
*/
struct ubifs_wbuf {
struct ubifs_info *c;
void *buf;
int lnum;
int offs;
int avail;
int used;
int size;
int jhead;
int (*sync_callback)(struct ubifs_info *c, int lnum, int free, int pad);
struct mutex io_mutex;
spinlock_t lock;
int next_ino;
ino_t *inodes;
};
/**
* struct ubifs_bud - bud logical eraseblock.
* @lnum: logical eraseblock number
* @start: where the (uncommitted) bud data starts
* @jhead: journal head number this bud belongs to
* @list: link in the list buds belonging to the same journal head
* @rb: link in the tree of all buds
* @log_hash: the log hash from the commit start node up to this bud
*/
struct ubifs_bud {
int lnum;
int start;
int jhead;
struct list_head list;
struct rb_node rb;
struct shash_desc *log_hash;
};
/**
* struct ubifs_jhead - journal head.
* @wbuf: head's write-buffer
* @buds_list: list of bud LEBs belonging to this journal head
* @grouped: non-zero if UBIFS groups nodes when writing to this journal head
* @log_hash: the log hash from the commit start node up to this journal head
*
* Note, the @buds list is protected by the @c->buds_lock.
*/
struct ubifs_jhead {
struct ubifs_wbuf wbuf;
struct list_head buds_list;
unsigned int grouped:1;
struct shash_desc *log_hash;
};
/**
* struct ubifs_zbranch - key/coordinate/length branch stored in znodes.
* @key: key
* @znode: znode address in memory
* @lnum: LEB number of the target node (indexing node or data node)
* @offs: target node offset within @lnum
* @len: target node length
* @hash: the hash of the target node
*/
struct ubifs_zbranch {
union ubifs_key key;
union {
struct ubifs_znode *znode;
void *leaf;
};
int lnum;
int offs;
int len;
u8 hash[UBIFS_HASH_ARR_SZ];
};
/**
* struct ubifs_znode - in-memory representation of an indexing node.
* @parent: parent znode or NULL if it is the root
* @cnext: next znode to commit
* @cparent: parent node for this commit
* @ciip: index in cparent's zbranch array
* @flags: znode flags (%DIRTY_ZNODE, %COW_ZNODE or %OBSOLETE_ZNODE)
* @time: last access time (seconds)
* @level: level of the entry in the TNC tree
* @child_cnt: count of child znodes
* @iip: index in parent's zbranch array
* @alt: lower bound of key range has altered i.e. child inserted at slot 0
* @lnum: LEB number of the corresponding indexing node
* @offs: offset of the corresponding indexing node
* @len: length of the corresponding indexing node
* @zbranch: array of znode branches (@c->fanout elements)
*
* Note! The @lnum, @offs, and @len fields are not really needed - we have them
* only for internal consistency check. They could be removed to save some RAM.
*/
struct ubifs_znode {
struct ubifs_znode *parent;
struct ubifs_znode *cnext;
struct ubifs_znode *cparent;
int ciip;
unsigned long flags;
time64_t time;
int level;
int child_cnt;
int iip;
int alt;
int lnum;
int offs;
int len;
struct ubifs_zbranch zbranch[];
};
/**
* struct ubifs_node_range - node length range description data structure.
* @len: fixed node length
* @min_len: minimum possible node length
* @max_len: maximum possible node length
*
* If @max_len is %0, the node has fixed length @len.
*/
struct ubifs_node_range {
union {
int len;
int min_len;
};
int max_len;
};
/**
* struct ubifs_budget_req - budget requirements of an operation.
*
* @fast: non-zero if the budgeting should try to acquire budget quickly and
* should not try to call write-back
* @recalculate: non-zero if @idx_growth, @data_growth, and @dd_growth fields
* have to be re-calculated
* @new_page: non-zero if the operation adds a new page
* @dirtied_page: non-zero if the operation makes a page dirty
* @new_dent: non-zero if the operation adds a new directory entry
* @mod_dent: non-zero if the operation removes or modifies an existing
* directory entry
* @new_ino: non-zero if the operation adds a new inode
* @new_ino_d: how much data newly created inode contains
* @dirtied_ino: how many inodes the operation makes dirty
* @dirtied_ino_d: how much data dirtied inode contains
* @idx_growth: how much the index will supposedly grow
* @data_growth: how much new data the operation will supposedly add
* @dd_growth: how much data that makes other data dirty the operation will
* supposedly add
*
* @idx_growth, @data_growth and @dd_growth are not used in budget request. The
* budgeting subsystem caches index and data growth values there to avoid
* re-calculating them when the budget is released. However, if @idx_growth is
* %-1, it is calculated by the release function using other fields.
*
* An inode may contain 4KiB of data at max., thus the widths of @new_ino_d
* is 13 bits, and @dirtied_ino_d - 15, because up to 4 inodes may be made
* dirty by the re-name operation.
*
* Note, UBIFS aligns node lengths to 8-bytes boundary, so the requester has to
* make sure the amount of inode data which contribute to @new_ino_d and
* @dirtied_ino_d fields are aligned.
*/
struct ubifs_budget_req {
unsigned int fast:1;
unsigned int recalculate:1;
#ifndef UBIFS_DEBUG
unsigned int new_page:1;
unsigned int dirtied_page:1;
unsigned int new_dent:1;
unsigned int mod_dent:1;
unsigned int new_ino:1;
unsigned int new_ino_d:13;
unsigned int dirtied_ino:4;
unsigned int dirtied_ino_d:15;
#else
/* Not bit-fields to check for overflows */
unsigned int new_page;
unsigned int dirtied_page;
unsigned int new_dent;
unsigned int mod_dent;
unsigned int new_ino;
unsigned int new_ino_d;
unsigned int dirtied_ino;
unsigned int dirtied_ino_d;
#endif
int idx_growth;
int data_growth;
int dd_growth;
};
/**
* struct ubifs_orphan - stores the inode number of an orphan.
* @rb: rb-tree node of rb-tree of orphans sorted by inode number
* @list: list head of list of orphans in order added
* @new_list: list head of list of orphans added since the last commit
* @cnext: next orphan to commit
* @dnext: next orphan to delete
* @inum: inode number
* @new: %1 => added since the last commit, otherwise %0
* @cmt: %1 => commit pending, otherwise %0
* @del: %1 => delete pending, otherwise %0
*/
struct ubifs_orphan {
struct rb_node rb;
struct list_head list;
struct list_head new_list;
struct ubifs_orphan *cnext;
struct ubifs_orphan *dnext;
ino_t inum;
unsigned new:1;
unsigned cmt:1;
unsigned del:1;
};
/**
* struct ubifs_budg_info - UBIFS budgeting information.
* @idx_growth: amount of bytes budgeted for index growth
* @data_growth: amount of bytes budgeted for cached data
* @dd_growth: amount of bytes budgeted for cached data that will make
* other data dirty
* @uncommitted_idx: amount of bytes were budgeted for growth of the index, but
* which still have to be taken into account because the index
* has not been committed so far
* @old_idx_sz: size of index on flash
* @min_idx_lebs: minimum number of LEBs required for the index
* @nospace: non-zero if the file-system does not have flash space (used as
* optimization)
* @nospace_rp: the same as @nospace, but additionally means that even reserved
* pool is full
* @page_budget: budget for a page (constant, never changed after mount)
* @inode_budget: budget for an inode (constant, never changed after mount)
* @dent_budget: budget for a directory entry (constant, never changed after
* mount)
*/
struct ubifs_budg_info {
long long idx_growth;
long long data_growth;
long long dd_growth;
long long uncommitted_idx;
unsigned long long old_idx_sz;
int min_idx_lebs;
unsigned int nospace:1;
unsigned int nospace_rp:1;
int page_budget;
int inode_budget;
int dent_budget;
};
/**
* struct ubifs_info - UBIFS file-system description data structure
* (per-superblock).
*
* @sup_node: The super block node as read from the device
*
* @highest_inum: highest used inode number
* @max_sqnum: current global sequence number
* @cmt_no: commit number of the last successfully completed commit, protected
* by @commit_sem
* @cnt_lock: protects @highest_inum and @max_sqnum counters
* @fmt_version: UBIFS on-flash format version
* @ro_compat_version: R/O compatibility version
*
* @debug_level: level of debug messages, 0 - none, 1 - error message,
* 2 - warning message, 3 - notice message, 4 - debug message
* @program_type: used to identify the type of current program
* @program_name: program name
* @dev_name: device name
* @dev_fd: opening handler for an UBI volume or an image file
* @libubi: opening handler for libubi
*
* @lhead_lnum: log head logical eraseblock number
* @lhead_offs: log head offset
* @ltail_lnum: log tail logical eraseblock number (offset is always 0)
* @log_mutex: protects the log, @lhead_lnum, @lhead_offs, @ltail_lnum, and
* @bud_bytes
* @min_log_bytes: minimum required number of bytes in the log
* @cmt_bud_bytes: used during commit to temporarily amount of bytes in
* committed buds
*
* @buds: tree of all buds indexed by bud LEB number
* @bud_bytes: how many bytes of flash is used by buds
* @buds_lock: protects the @buds tree, @bud_bytes, and per-journal head bud
* lists
* @jhead_cnt: count of journal heads
* @jheads: journal heads (head zero is base head)
* @max_bud_bytes: maximum number of bytes allowed in buds
* @bg_bud_bytes: number of bud bytes when background commit is initiated
* @old_buds: buds to be released after commit ends
* @max_bud_cnt: maximum number of buds
*
* @commit_sem: synchronizes committer with other processes
* @cmt_state: commit state
* @cs_lock: commit state lock
*
* @big_lpt: flag that LPT is too big to write whole during commit
* @space_fixup: flag indicating that free space in LEBs needs to be cleaned up
* @double_hash: flag indicating that we can do lookups by hash
* @encrypted: flag indicating that this file system contains encrypted files
* @no_chk_data_crc: do not check CRCs when reading data nodes (except during
* recovery)
* @authenticated: flag indigating the FS is mounted in authenticated mode
* @superblock_need_write: flag indicating that we need to write superblock node
*
* @tnc_mutex: protects the Tree Node Cache (TNC), @zroot, @cnext, @enext, and
* @calc_idx_sz
* @zroot: zbranch which points to the root index node and znode
* @cnext: next znode to commit
* @enext: next znode to commit to empty space
* @gap_lebs: array of LEBs used by the in-gaps commit method
* @cbuf: commit buffer
* @ileb_buf: buffer for commit in-the-gaps method
* @ileb_len: length of data in ileb_buf
* @ihead_lnum: LEB number of index head
* @ihead_offs: offset of index head
* @ilebs: pre-allocated index LEBs
* @ileb_cnt: number of pre-allocated index LEBs
* @ileb_nxt: next pre-allocated index LEBs
* @old_idx: tree of index nodes obsoleted since the last commit start
* @bottom_up_buf: a buffer which is used by 'dirty_cow_bottom_up()' in tnc.c
*
* @mst_node: master node
* @mst_offs: offset of valid master node
*
* @log_lebs: number of logical eraseblocks in the log
* @log_bytes: log size in bytes
* @log_last: last LEB of the log
* @lpt_lebs: number of LEBs used for lprops table
* @lpt_first: first LEB of the lprops table area
* @lpt_last: last LEB of the lprops table area
* @orph_lebs: number of LEBs used for the orphan area
* @orph_first: first LEB of the orphan area
* @orph_last: last LEB of the orphan area
* @main_lebs: count of LEBs in the main area
* @main_first: first LEB of the main area
* @main_bytes: main area size in bytes
* @default_compr: default compression type
* @favor_lzo: favor LZO compression method
* @favor_percent: lzo vs. zlib threshold used in case favor LZO
*
* @key_hash_type: type of the key hash
* @key_hash: direntry key hash function
* @key_fmt: key format
* @key_len: key length
* @fanout: fanout of the index tree (number of links per indexing node)
*
* @min_io_size: minimal input/output unit size
* @min_io_shift: number of bits in @min_io_size minus one
* @max_write_size: maximum amount of bytes the underlying flash can write at a
* time (MTD write buffer size)
* @max_write_shift: number of bits in @max_write_size minus one
* @leb_size: logical eraseblock size in bytes
* @half_leb_size: half LEB size
* @idx_leb_size: how many bytes of an LEB are effectively available when it is
* used to store indexing nodes (@leb_size - @max_idx_node_sz)
* @leb_cnt: count of logical eraseblocks
* @max_leb_cnt: maximum count of logical eraseblocks
* @ro_media: the underlying UBI volume is read-only
* @ro_mount: the file-system was mounted as read-only
* @ro_error: UBIFS switched to R/O mode because an error happened
*
* @dirty_pg_cnt: number of dirty pages (not used)
* @dirty_zn_cnt: number of dirty znodes
* @clean_zn_cnt: number of clean znodes
*
* @space_lock: protects @bi and @lst
* @lst: lprops statistics
* @bi: budgeting information
* @calc_idx_sz: temporary variable which is used to calculate new index size
* (contains accurate new index size at end of TNC commit start)
*
* @ref_node_alsz: size of the LEB reference node aligned to the min. flash
* I/O unit
* @mst_node_alsz: master node aligned size
* @min_idx_node_sz: minimum indexing node aligned on 8-bytes boundary
* @max_idx_node_sz: maximum indexing node aligned on 8-bytes boundary
* @max_inode_sz: maximum possible inode size in bytes
* @max_znode_sz: size of znode in bytes
*
* @leb_overhead: how many bytes are wasted in an LEB when it is filled with
* data nodes of maximum size - used in free space reporting
* @dead_wm: LEB dead space watermark
* @dark_wm: LEB dark space watermark
*
* @ranges: UBIFS node length ranges
* @di: UBI device information
* @vi: UBI volume information
*
* @orph_tree: rb-tree of orphan inode numbers
* @orph_list: list of orphan inode numbers in order added
* @orph_new: list of orphan inode numbers added since last commit
* @orph_cnext: next orphan to commit
* @orph_dnext: next orphan to delete
* @orphan_lock: lock for orph_tree and orph_new
* @orph_buf: buffer for orphan nodes
* @new_orphans: number of orphans since last commit
* @cmt_orphans: number of orphans being committed
* @tot_orphans: number of orphans in the rb_tree
* @max_orphans: maximum number of orphans allowed
* @ohead_lnum: orphan head LEB number
* @ohead_offs: orphan head offset
* @no_orphs: non-zero if there are no orphans
*
* @gc_lnum: LEB number used for garbage collection
* @sbuf: a buffer of LEB size used by GC and replay for scanning
* @idx_gc: list of index LEBs that have been garbage collected
* @idx_gc_cnt: number of elements on the idx_gc list
* @gc_seq: incremented for every non-index LEB garbage collected
* @gced_lnum: last non-index LEB that was garbage collected
*
* @space_bits: number of bits needed to record free or dirty space
* @lpt_lnum_bits: number of bits needed to record a LEB number in the LPT
* @lpt_offs_bits: number of bits needed to record an offset in the LPT
* @lpt_spc_bits: number of bits needed to space in the LPT
* @pcnt_bits: number of bits needed to record pnode or nnode number
* @lnum_bits: number of bits needed to record LEB number
* @nnode_sz: size of on-flash nnode
* @pnode_sz: size of on-flash pnode
* @ltab_sz: size of on-flash LPT lprops table
* @lsave_sz: size of on-flash LPT save table
* @pnode_cnt: number of pnodes
* @nnode_cnt: number of nnodes
* @lpt_hght: height of the LPT
* @pnodes_have: number of pnodes in memory
*
* @lp_mutex: protects lprops table and all the other lprops-related fields
* @lpt_lnum: LEB number of the root nnode of the LPT
* @lpt_offs: offset of the root nnode of the LPT
* @nhead_lnum: LEB number of LPT head
* @nhead_offs: offset of LPT head
* @lpt_drty_flgs: dirty flags for LPT special nodes e.g. ltab
* @dirty_nn_cnt: number of dirty nnodes
* @dirty_pn_cnt: number of dirty pnodes
* @check_lpt_free: flag that indicates LPT GC may be needed
* @lpt_sz: LPT size
* @lpt_nod_buf: buffer for an on-flash nnode or pnode
* @lpt_buf: buffer of LEB size used by LPT
* @nroot: address in memory of the root nnode of the LPT
* @lpt_cnext: next LPT node to commit
* @lpt_heap: array of heaps of categorized lprops
* @dirty_idx: a (reverse sorted) copy of the LPROPS_DIRTY_IDX heap as at
* previous commit start
* @uncat_list: list of un-categorized LEBs
* @empty_list: list of empty LEBs
* @freeable_list: list of freeable non-index LEBs (free + dirty == @leb_size)
* @frdi_idx_list: list of freeable index LEBs (free + dirty == @leb_size)
* @freeable_cnt: number of freeable LEBs in @freeable_list
* @in_a_category_cnt: count of lprops which are in a certain category, which
* basically meants that they were loaded from the flash
*
* @ltab_lnum: LEB number of LPT's own lprops table
* @ltab_offs: offset of LPT's own lprops table
* @lpt: lprops table
* @ltab: LPT's own lprops table
* @ltab_cmt: LPT's own lprops table (commit copy)
* @lsave_cnt: number of LEB numbers in LPT's save table
* @lsave_lnum: LEB number of LPT's save table
* @lsave_offs: offset of LPT's save table
* @lsave: LPT's save table
* @lscan_lnum: LEB number of last LPT scan
*
* @rp_size: reserved pool size
*
* @hash_algo_name: the name of the hashing algorithm to use
* @hash_algo: The hash algo number (from include/linux/hash_info.h)
* @auth_key_filename: authentication key file name
* @x509_filename: x509 certificate file name for authentication
* @hash_len: the length of the hash
* @root_idx_hash: The hash of the root index node
* @lpt_hash: The hash of the LPT
* @mst_hash: The hash of the master node
* @log_hash: the log hash from the commit start node up to the latest reference
* node.
*
* @need_recovery: %1 if the file-system needs recovery
* @replaying: %1 during journal replay
* @mounting: %1 while mounting
* @remounting_rw: %1 while re-mounting from R/O mode to R/W mode
* @replay_list: temporary list used during journal replay
* @replay_buds: list of buds to replay
* @cs_sqnum: sequence number of first node in the log (commit start node)
* @unclean_leb_list: LEBs to recover when re-mounting R/O mounted FS to R/W
* mode
* @rcvrd_mst_node: recovered master node to write when re-mounting R/O mounted
* FS to R/W mode
* @size_tree: inode size information for recovery
*
* @new_ihead_lnum: used by debugging to check @c->ihead_lnum
* @new_ihead_offs: used by debugging to check @c->ihead_offs
*
* @private: private information related to specific situation, eg. fsck.
* @assert_failed_cb: callback function to handle assertion failure
* @set_failure_reason_cb: record reasons while certain failure happens
* @get_failure_reason_cb: get failure reasons
* @clear_failure_reason_cb: callback function to clear the error which is
* caused by reading corrupted data or invalid lpt
* @test_and_clear_failure_reason_cb: callback function to check and clear the
* error which is caused by reading corrupted
* data or invalid lpt
* @set_lpt_invalid_cb: callback function to set the invalid lpt status
* @test_lpt_valid_cb: callback function to check whether lpt is corrupted or
* incorrect, should be called before updating lpt
* @can_ignore_failure_cb: callback function to decide whether the failure
* can be ignored
* @handle_failure_cb: callback function to decide whether the failure can be
* handled
*/
struct ubifs_info {
struct ubifs_sb_node *sup_node;
ino_t highest_inum;
unsigned long long max_sqnum;
unsigned long long cmt_no;
spinlock_t cnt_lock;
int fmt_version;
int ro_compat_version;
int debug_level;
int program_type;
const char *program_name;
char *dev_name;
int dev_fd;
libubi_t libubi;
int lhead_lnum;
int lhead_offs;
int ltail_lnum;
struct mutex log_mutex;
int min_log_bytes;
long long cmt_bud_bytes;
struct rb_root buds;
long long bud_bytes;
spinlock_t buds_lock;
int jhead_cnt;
struct ubifs_jhead *jheads;
long long max_bud_bytes;
long long bg_bud_bytes;
struct list_head old_buds;
int max_bud_cnt;
struct rw_semaphore commit_sem;
int cmt_state;
spinlock_t cs_lock;
unsigned int big_lpt:1;
unsigned int space_fixup:1;
unsigned int double_hash:1;
unsigned int encrypted:1;
unsigned int no_chk_data_crc:1;
unsigned int authenticated:1;
unsigned int superblock_need_write:1;
struct mutex tnc_mutex;
struct ubifs_zbranch zroot;
struct ubifs_znode *cnext;
struct ubifs_znode *enext;
int *gap_lebs;
void *cbuf;
void *ileb_buf;
int ileb_len;
int ihead_lnum;
int ihead_offs;
int *ilebs;
int ileb_cnt;
int ileb_nxt;
struct rb_root old_idx;
int *bottom_up_buf;
struct ubifs_mst_node *mst_node;
int mst_offs;
int log_lebs;
long long log_bytes;
int log_last;
int lpt_lebs;
int lpt_first;
int lpt_last;
int orph_lebs;
int orph_first;
int orph_last;
int main_lebs;
int main_first;
long long main_bytes;
int default_compr;
int favor_lzo;
int favor_percent;
uint8_t key_hash_type;
uint32_t (*key_hash)(const char *str, int len);
int key_fmt;
int key_len;
int fanout;
int min_io_size;
int min_io_shift;
int max_write_size;
int max_write_shift;
int leb_size;
int half_leb_size;
int idx_leb_size;
int leb_cnt;
int max_leb_cnt;
unsigned int ro_media:1;
unsigned int ro_mount:1;
unsigned int ro_error:1;
atomic_long_t dirty_pg_cnt;
atomic_long_t dirty_zn_cnt;
atomic_long_t clean_zn_cnt;
spinlock_t space_lock;
struct ubifs_lp_stats lst;
struct ubifs_budg_info bi;
unsigned long long calc_idx_sz;
int ref_node_alsz;
int mst_node_alsz;
int min_idx_node_sz;
int max_idx_node_sz;
long long max_inode_sz;
int max_znode_sz;
int leb_overhead;
int dead_wm;
int dark_wm;
struct ubifs_node_range ranges[UBIFS_NODE_TYPES_CNT];
struct ubi_dev_info di;
struct ubi_vol_info vi;
struct rb_root orph_tree;
struct list_head orph_list;
struct list_head orph_new;
struct ubifs_orphan *orph_cnext;
struct ubifs_orphan *orph_dnext;
spinlock_t orphan_lock;
void *orph_buf;
int new_orphans;
int cmt_orphans;
int tot_orphans;
int max_orphans;
int ohead_lnum;
int ohead_offs;
int no_orphs;
int gc_lnum;
void *sbuf;
struct list_head idx_gc;
int idx_gc_cnt;
int gc_seq;
int gced_lnum;
int space_bits;
int lpt_lnum_bits;
int lpt_offs_bits;
int lpt_spc_bits;
int pcnt_bits;
int lnum_bits;
int nnode_sz;
int pnode_sz;
int ltab_sz;
int lsave_sz;
int pnode_cnt;
int nnode_cnt;
int lpt_hght;
int pnodes_have;
struct mutex lp_mutex;
int lpt_lnum;
int lpt_offs;
int nhead_lnum;
int nhead_offs;
int lpt_drty_flgs;
int dirty_nn_cnt;
int dirty_pn_cnt;
int check_lpt_free;
long long lpt_sz;
void *lpt_nod_buf;
void *lpt_buf;
struct ubifs_nnode *nroot;
struct ubifs_cnode *lpt_cnext;
struct ubifs_lpt_heap lpt_heap[LPROPS_HEAP_CNT];
struct ubifs_lpt_heap dirty_idx;
struct list_head uncat_list;
struct list_head empty_list;
struct list_head freeable_list;
struct list_head frdi_idx_list;
int freeable_cnt;
int in_a_category_cnt;
int ltab_lnum;
int ltab_offs;
struct ubifs_lprops *lpt;
struct ubifs_lpt_lprops *ltab;
struct ubifs_lpt_lprops *ltab_cmt;
int lsave_cnt;
int lsave_lnum;
int lsave_offs;
int *lsave;
int lscan_lnum;
long long rp_size;
char *hash_algo_name;
int hash_algo;
char *auth_key_filename;
char *auth_cert_filename;
int hash_len;
uint8_t root_idx_hash[UBIFS_MAX_HASH_LEN];
uint8_t lpt_hash[UBIFS_MAX_HASH_LEN];
uint8_t mst_hash[UBIFS_MAX_HASH_LEN];
struct shash_desc *log_hash;
unsigned int need_recovery:1;
unsigned int replaying:1;
unsigned int mounting:1;
unsigned int remounting_rw:1;
struct list_head replay_list;
struct list_head replay_buds;
unsigned long long cs_sqnum;
struct list_head unclean_leb_list;
struct ubifs_mst_node *rcvrd_mst_node;
struct rb_root size_tree;
int new_ihead_lnum;
int new_ihead_offs;
void *private;
void (*assert_failed_cb)(const struct ubifs_info *c);
void (*set_failure_reason_cb)(const struct ubifs_info *c,
unsigned int reason);
unsigned int (*get_failure_reason_cb)(const struct ubifs_info *c);
void (*clear_failure_reason_cb)(const struct ubifs_info *c);
bool (*test_and_clear_failure_reason_cb)(const struct ubifs_info *c,
unsigned int reason);
void (*set_lpt_invalid_cb)(const struct ubifs_info *c,
unsigned int reason);
bool (*test_lpt_valid_cb)(const struct ubifs_info *c, int lnum,
int old_free, int old_dirty,
int free, int dirty);
bool (*can_ignore_failure_cb)(const struct ubifs_info *c,
unsigned int reason);
bool (*handle_failure_cb)(const struct ubifs_info *c,
unsigned int reason, void *priv);
};
extern atomic_long_t ubifs_clean_zn_cnt;
/* auth.c */
static inline int ubifs_authenticated(const struct ubifs_info *c)
{
return c->authenticated;
}
/**
* struct size_entry - inode size information for recovery.
* @rb: link in the RB-tree of sizes
* @inum: inode number
* @i_size: size on inode
* @d_size: maximum size based on data nodes
* @exists: indicates whether the inode exists
*/
struct size_entry {
struct rb_node rb;
ino_t inum;
loff_t i_size;
loff_t d_size;
int exists;
};
#ifdef WITH_CRYPTO
int ubifs_init_authentication(struct ubifs_info *c);
int ubifs_shash_init(const struct ubifs_info *c, struct shash_desc *desc);
int ubifs_shash_update(const struct ubifs_info *c, struct shash_desc *desc,
const void *buf, unsigned int len);
int ubifs_shash_final(const struct ubifs_info *c, struct shash_desc *desc,
u8 *out);
struct shash_desc *ubifs_hash_get_desc(const struct ubifs_info *c);
int __ubifs_node_calc_hash(const struct ubifs_info *c, const void *buf,
u8 *hash);
int ubifs_master_node_calc_hash(const struct ubifs_info *c, const void *node,
uint8_t *hash);
int ubifs_sign_superblock_node(struct ubifs_info *c, void *node);
void ubifs_bad_hash(const struct ubifs_info *c, const void *node,
const u8 *hash, int lnum, int offs);
void __ubifs_exit_authentication(struct ubifs_info *c);
#else
static inline int ubifs_init_authentication(__unused struct ubifs_info *c)
{ return 0; }
static inline int ubifs_shash_init(__unused const struct ubifs_info *c,
__unused struct shash_desc *desc)
{ return 0; }
static inline int ubifs_shash_update(__unused const struct ubifs_info *c,
__unused struct shash_desc *desc,
__unused const void *buf,
__unused unsigned int len) { return 0; }
static inline int ubifs_shash_final(__unused const struct ubifs_info *c,
__unused struct shash_desc *desc,
__unused u8 *out) { return 0; }
static inline struct shash_desc *
ubifs_hash_get_desc(__unused const struct ubifs_info *c) { return NULL; }
static inline int __ubifs_node_calc_hash(__unused const struct ubifs_info *c,
__unused const void *buf,
__unused u8 *hash) { return 0; }
static inline int
ubifs_master_node_calc_hash(__unused const struct ubifs_info *c,
__unused const void *node, __unused uint8_t *hash)
{ return 0; }
static inline int ubifs_sign_superblock_node(__unused struct ubifs_info *c,
__unused void *node)
{ return 0; }
static inline void ubifs_bad_hash(__unused const struct ubifs_info *c,
__unused const void *node,
__unused const u8 *hash, __unused int lnum,
__unused int offs) {}
static inline void __ubifs_exit_authentication(__unused struct ubifs_info *c) {}
#endif
static inline int ubifs_prepare_auth_node(__unused struct ubifs_info *c,
__unused void *node,
__unused struct shash_desc *inhash)
{
// To be implemented
return 0;
}
static inline int
ubifs_node_calc_hash(const struct ubifs_info *c, const void *buf, u8 *hash)
{
if (ubifs_authenticated(c))
return __ubifs_node_calc_hash(c, buf, hash);
else
return 0;
}
static inline int
ubifs_node_check_hash(__unused const struct ubifs_info *c,
__unused const void *buf, __unused const u8 *expected)
{
// To be implemented
return 0;
}
/**
* ubifs_check_hash - compare two hashes
* @c: UBIFS file-system description object
* @expected: first hash
* @got: second hash
*
* Compare two hashes @expected and @got. Returns 0 when they are equal, a
* negative error code otherwise.
*/
static inline int
ubifs_check_hash(__unused const struct ubifs_info *c,
__unused const u8 *expected, __unused const u8 *got)
{
// To be implemented
return 0;
}
/**
* ubifs_check_hmac - compare two HMACs
* @c: UBIFS file-system description object
* @expected: first HMAC
* @got: second HMAC
*
* Compare two hashes @expected and @got. Returns 0 when they are equal, a
* negative error code otherwise.
*/
static inline int
ubifs_check_hmac(__unused const struct ubifs_info *c,
__unused const u8 *expected, __unused const u8 *got)
{
// To be implemented
return 0;
}
/**
* ubifs_branch_hash - returns a pointer to the hash of a branch
* @c: UBIFS file-system description object
* @br: branch to get the hash from
*
* This returns a pointer to the hash of a branch. Since the key already is a
* dynamically sized object we cannot use a struct member here.
*/
static inline u8 *
ubifs_branch_hash(struct ubifs_info *c, struct ubifs_branch *br)
{
return (void *)br + sizeof(*br) + c->key_len;
}
/**
* ubifs_copy_hash - copy a hash
* @c: UBIFS file-system description object
* @from: source hash
* @to: destination hash
*
* With authentication this copies a hash, otherwise does nothing.
*/
static inline void
ubifs_copy_hash(const struct ubifs_info *c, const u8 *from, u8 *to)
{
if (ubifs_authenticated(c))
memcpy(to, from, c->hash_len);
}
static inline int
ubifs_node_insert_hmac(__unused const struct ubifs_info *c, __unused void *buf,
__unused int len, __unused int ofs_hmac)
{
// To be implemented
return 0;
}
static inline int
ubifs_node_verify_hmac(__unused const struct ubifs_info *c,
__unused const void *buf, __unused int len,
__unused int ofs_hmac)
{
// To be implemented
return 0;
}
/**
* ubifs_auth_node_sz - returns the size of an authentication node
* @c: UBIFS file-system description object
*
* This function returns the size of an authentication node which can
* be 0 for unauthenticated filesystems or the real size of an auth node
* authentication is enabled.
*/
static inline int
ubifs_auth_node_sz(__unused const struct ubifs_info *c)
{
// To be implemented
return 0;
}
static inline bool
ubifs_hmac_zero(__unused struct ubifs_info *c, __unused const u8 *hmac)
{
// To be implemented
return true;
}
static inline int
ubifs_shash_copy_state(__unused const struct ubifs_info *c,
__unused struct shash_desc *src,
__unused struct shash_desc *target)
{
// To be implemented
return 0;
}
static inline void ubifs_exit_authentication(struct ubifs_info *c)
{
if (ubifs_authenticated(c))
__ubifs_exit_authentication(c);
}
/* io.c */
void ubifs_ro_mode(struct ubifs_info *c, int err);
int ubifs_leb_read(const struct ubifs_info *c, int lnum, void *buf, int offs,
int len, int even_ebadmsg);
int ubifs_leb_write(struct ubifs_info *c, int lnum, const void *buf, int offs,
int len);
int ubifs_leb_change(struct ubifs_info *c, int lnum, const void *buf, int len);
int ubifs_leb_unmap(struct ubifs_info *c, int lnum);
int ubifs_leb_map(struct ubifs_info *c, int lnum);
int ubifs_is_mapped(const struct ubifs_info *c, int lnum);
int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len);
int ubifs_wbuf_seek_nolock(struct ubifs_wbuf *wbuf, int lnum, int offs);
int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf);
int ubifs_read_node(const struct ubifs_info *c, void *buf, int type, int len,
int lnum, int offs);
int ubifs_read_node_wbuf(struct ubifs_wbuf *wbuf, void *buf, int type, int len,
int lnum, int offs);
int ubifs_write_node(struct ubifs_info *c, void *node, int len, int lnum,
int offs);
int ubifs_write_node_hmac(struct ubifs_info *c, void *buf, int len, int lnum,
int offs, int hmac_offs);
int ubifs_check_node(const struct ubifs_info *c, const void *buf, int len,
int lnum, int offs, int quiet, int must_chk_crc);
void ubifs_init_node(struct ubifs_info *c, void *buf, int len, int pad);
void ubifs_crc_node(struct ubifs_info *c, void *buf, int len);
void ubifs_prepare_node(struct ubifs_info *c, void *buf, int len, int pad);
int ubifs_prepare_node_hmac(struct ubifs_info *c, void *node, int len,
int hmac_offs, int pad);
void ubifs_prep_grp_node(struct ubifs_info *c, void *node, int len, int last);
int ubifs_io_init(struct ubifs_info *c);
void ubifs_pad(const struct ubifs_info *c, void *buf, int pad);
int ubifs_wbuf_sync_nolock(struct ubifs_wbuf *wbuf);
/* scan.c */
struct ubifs_scan_leb *ubifs_scan(const struct ubifs_info *c, int lnum,
int offs, void *sbuf, int quiet);
void ubifs_scan_destroy(struct ubifs_scan_leb *sleb);
int ubifs_scan_a_node(const struct ubifs_info *c, void *buf, int len, int lnum,
int offs, int quiet);
struct ubifs_scan_leb *ubifs_start_scan(const struct ubifs_info *c, int lnum,
int offs, void *sbuf);
void ubifs_end_scan(const struct ubifs_info *c, struct ubifs_scan_leb *sleb,
int lnum, int offs);
int ubifs_add_snod(const struct ubifs_info *c, struct ubifs_scan_leb *sleb,
void *buf, int offs);
void ubifs_scanned_corruption(const struct ubifs_info *c, int lnum, int offs,
void *buf);
/* Failure reasons which are checked by fsck. */
enum {
FR_DATA_CORRUPTED = 1, /* Data is corrupted(master/log/orphan/main) */
FR_TNC_CORRUPTED = 2, /* TNC is corrupted */
FR_LPT_CORRUPTED = 4, /* LPT is corrupted */
FR_LPT_INCORRECT = 8 /* Space statistics are wrong */
};
/* Partial failure reasons in common libs, which are handled by fsck. */
enum {
FR_H_BUD_CORRUPTED = 0, /* Bud LEB is corrupted */
FR_H_TNC_DATA_CORRUPTED, /* Data searched from TNC is corrupted */
FR_H_ORPHAN_CORRUPTED, /* Orphan LEB is corrupted */
};
/* Callback functions for failure(which can be handled by fsck) happens. */
static inline void set_failure_reason_callback(const struct ubifs_info *c,
unsigned int reason)
{
if (c->set_failure_reason_cb)
c->set_failure_reason_cb(c, reason);
}
static inline unsigned int get_failure_reason_callback(
const struct ubifs_info *c)
{
if (c->get_failure_reason_cb)
return c->get_failure_reason_cb(c);
return 0;
}
static inline void clear_failure_reason_callback(const struct ubifs_info *c)
{
if (c->clear_failure_reason_cb)
c->clear_failure_reason_cb(c);
}
static inline bool test_and_clear_failure_reason_callback(
const struct ubifs_info *c,
unsigned int reason)
{
if (c->test_and_clear_failure_reason_cb)
return c->test_and_clear_failure_reason_cb(c, reason);
return false;
}
static inline void set_lpt_invalid_callback(const struct ubifs_info *c,
unsigned int reason)
{
if (c->set_lpt_invalid_cb)
c->set_lpt_invalid_cb(c, reason);
}
static inline bool test_lpt_valid_callback(const struct ubifs_info *c, int lnum,
int old_free, int old_dirty,
int free, int dirty)
{
if (c->test_lpt_valid_cb)
return c->test_lpt_valid_cb(c, lnum,
old_free, old_dirty, free, dirty);
return false;
}
static inline bool can_ignore_failure_callback(const struct ubifs_info *c,
unsigned int reason)
{
if (c->can_ignore_failure_cb)
return c->can_ignore_failure_cb(c, reason);
return false;
}
static inline bool handle_failure_callback(const struct ubifs_info *c,
unsigned int reason, void *priv)
{
if (c->handle_failure_cb)
return c->handle_failure_cb(c, reason, priv);
return false;
}
/* log.c */
void ubifs_add_bud(struct ubifs_info *c, struct ubifs_bud *bud);
void ubifs_create_buds_lists(struct ubifs_info *c);
int ubifs_add_bud_to_log(struct ubifs_info *c, int jhead, int lnum, int offs);
struct ubifs_bud *ubifs_search_bud(struct ubifs_info *c, int lnum);
struct ubifs_wbuf *ubifs_get_wbuf(struct ubifs_info *c, int lnum);
int ubifs_log_start_commit(struct ubifs_info *c, int *ltail_lnum);
int ubifs_log_end_commit(struct ubifs_info *c, int new_ltail_lnum);
int ubifs_log_post_commit(struct ubifs_info *c, int old_ltail_lnum);
int ubifs_consolidate_log(struct ubifs_info *c);
/* journal.c */
int ubifs_get_dent_type(int mode);
/* budget.c */
int ubifs_budget_space(struct ubifs_info *c, struct ubifs_budget_req *req);
void ubifs_release_budget(struct ubifs_info *c, struct ubifs_budget_req *req);
long long ubifs_get_free_space_nolock(struct ubifs_info *c);
int ubifs_calc_min_idx_lebs(struct ubifs_info *c);
long long ubifs_reported_space(const struct ubifs_info *c, long long free);
long long ubifs_calc_available(const struct ubifs_info *c, int min_idx_lebs);
/* find.c */
int ubifs_find_free_space(struct ubifs_info *c, int min_space, int *offs,
int squeeze);
int ubifs_find_free_leb_for_idx(struct ubifs_info *c);
int ubifs_find_dirty_leb(struct ubifs_info *c, struct ubifs_lprops *ret_lp,
int min_space, int pick_free);
int ubifs_find_dirty_idx_leb(struct ubifs_info *c);
int ubifs_save_dirty_idx_lnums(struct ubifs_info *c);
/* tnc.c */
int ubifs_lookup_level0(struct ubifs_info *c, const union ubifs_key *key,
struct ubifs_znode **zn, int *n);
int ubifs_tnc_lookup_nm(struct ubifs_info *c, const union ubifs_key *key,
void *node, const struct fscrypt_name *nm);
int ubifs_tnc_locate(struct ubifs_info *c, const union ubifs_key *key,
void *node, int *lnum, int *offs);
int ubifs_tnc_add(struct ubifs_info *c, const union ubifs_key *key, int lnum,
int offs, int len, const u8 *hash);
int ubifs_tnc_replace(struct ubifs_info *c, const union ubifs_key *key,
int old_lnum, int old_offs, int lnum, int offs, int len);
int ubifs_tnc_add_nm(struct ubifs_info *c, const union ubifs_key *key,
int lnum, int offs, int len, const u8 *hash,
const struct fscrypt_name *nm);
int ubifs_tnc_remove(struct ubifs_info *c, const union ubifs_key *key);
int ubifs_tnc_remove_nm(struct ubifs_info *c, const union ubifs_key *key,
const struct fscrypt_name *nm);
int ubifs_tnc_remove_range(struct ubifs_info *c, union ubifs_key *from_key,
union ubifs_key *to_key);
int ubifs_tnc_remove_ino(struct ubifs_info *c, ino_t inum);
int ubifs_tnc_remove_node(struct ubifs_info *c, const union ubifs_key *key,
int lnum, int offs);
struct ubifs_dent_node *ubifs_tnc_next_ent(struct ubifs_info *c,
union ubifs_key *key,
const struct fscrypt_name *nm);
void ubifs_tnc_close(struct ubifs_info *c);
int ubifs_tnc_has_node(struct ubifs_info *c, union ubifs_key *key, int level,
int lnum, int offs, int is_idx);
int ubifs_dirty_idx_node(struct ubifs_info *c, union ubifs_key *key, int level,
int lnum, int offs);
/* Shared by tnc.c for tnc_commit.c */
void destroy_old_idx(struct ubifs_info *c);
int is_idx_node_in_tnc(struct ubifs_info *c, union ubifs_key *key, int level,
int lnum, int offs);
int insert_old_idx_znode(struct ubifs_info *c, struct ubifs_znode *znode);
/* tnc_misc.c */
int ubifs_search_zbranch(const struct ubifs_info *c,
const struct ubifs_znode *znode,
const union ubifs_key *key, int *n);
struct ubifs_znode *ubifs_tnc_postorder_first(struct ubifs_znode *znode);
struct ubifs_znode *ubifs_tnc_postorder_next(const struct ubifs_info *c,
struct ubifs_znode *znode);
long ubifs_destroy_tnc_subtree(const struct ubifs_info *c,
struct ubifs_znode *zr);
void ubifs_destroy_tnc_tree(struct ubifs_info *c);
struct ubifs_znode *ubifs_load_znode(struct ubifs_info *c,
struct ubifs_zbranch *zbr,
struct ubifs_znode *parent, int iip);
int ubifs_tnc_read_node(struct ubifs_info *c, struct ubifs_zbranch *zbr,
void *node);
/* tnc_commit.c */
int ubifs_tnc_start_commit(struct ubifs_info *c, struct ubifs_zbranch *zroot);
int ubifs_tnc_end_commit(struct ubifs_info *c);
/* commit.c */
void ubifs_commit_required(struct ubifs_info *c);
void ubifs_request_bg_commit(struct ubifs_info *c);
int ubifs_run_commit(struct ubifs_info *c);
void ubifs_recovery_commit(struct ubifs_info *c);
int ubifs_gc_should_commit(struct ubifs_info *c);
void ubifs_wait_for_commit(struct ubifs_info *c);
/* master.c */
int ubifs_compare_master_node(struct ubifs_info *c, void *m1, void *m2);
int ubifs_read_master(struct ubifs_info *c);
int ubifs_write_master(struct ubifs_info *c);
/* sb.c */
int ubifs_read_superblock(struct ubifs_info *c);
int ubifs_write_sb_node(struct ubifs_info *c, struct ubifs_sb_node *sup);
int ubifs_fixup_free_space(struct ubifs_info *c);
/* replay.c */
int ubifs_validate_entry(struct ubifs_info *c,
const struct ubifs_dent_node *dent);
int ubifs_replay_journal(struct ubifs_info *c);
/* gc.c */
int ubifs_garbage_collect(struct ubifs_info *c, int anyway);
int ubifs_gc_start_commit(struct ubifs_info *c);
int ubifs_gc_end_commit(struct ubifs_info *c);
void ubifs_destroy_idx_gc(struct ubifs_info *c);
int ubifs_get_idx_gc_leb(struct ubifs_info *c);
int ubifs_garbage_collect_leb(struct ubifs_info *c, struct ubifs_lprops *lp);
/* orphan.c */
int ubifs_orphan_start_commit(struct ubifs_info *c);
int ubifs_orphan_end_commit(struct ubifs_info *c);
int ubifs_mount_orphans(struct ubifs_info *c, int unclean, int read_only);
int ubifs_clear_orphans(struct ubifs_info *c);
/* lpt.c */
int ubifs_calc_dflt_lpt_geom(struct ubifs_info *c, int *main_lebs, int *big_lpt);
int ubifs_calc_lpt_geom(struct ubifs_info *c);
int ubifs_create_lpt(struct ubifs_info *c, struct ubifs_lprops *lps, int lp_cnt,
u8 *hash);
int ubifs_lpt_init(struct ubifs_info *c, int rd, int wr);
struct ubifs_lprops *ubifs_lpt_lookup(struct ubifs_info *c, int lnum);
struct ubifs_lprops *ubifs_lpt_lookup_dirty(struct ubifs_info *c, int lnum);
int ubifs_lpt_scan_nolock(struct ubifs_info *c, int start_lnum, int end_lnum,
ubifs_lpt_scan_callback scan_cb, void *data);
/* Shared by lpt.c for lpt_commit.c */
void ubifs_pack_lsave(struct ubifs_info *c, void *buf, int *lsave);
void ubifs_pack_ltab(struct ubifs_info *c, void *buf,
struct ubifs_lpt_lprops *ltab);
void ubifs_pack_pnode(struct ubifs_info *c, void *buf,
struct ubifs_pnode *pnode);
void ubifs_pack_nnode(struct ubifs_info *c, void *buf,
struct ubifs_nnode *nnode);
struct ubifs_pnode *ubifs_get_pnode(struct ubifs_info *c,
struct ubifs_nnode *parent, int iip);
struct ubifs_nnode *ubifs_get_nnode(struct ubifs_info *c,
struct ubifs_nnode *parent, int iip);
struct ubifs_pnode *ubifs_pnode_lookup(struct ubifs_info *c, int i);
int ubifs_read_nnode(struct ubifs_info *c, struct ubifs_nnode *parent, int iip);
void ubifs_add_lpt_dirt(struct ubifs_info *c, int lnum, int dirty);
void ubifs_add_nnode_dirt(struct ubifs_info *c, struct ubifs_nnode *nnode);
uint32_t ubifs_unpack_bits(const struct ubifs_info *c, uint8_t **addr, int *pos, int nrbits);
struct ubifs_nnode *ubifs_first_nnode(struct ubifs_info *c, int *hght);
/* Needed only in debugging code in lpt_commit.c */
int ubifs_unpack_nnode(const struct ubifs_info *c, void *buf,
struct ubifs_nnode *nnode);
int ubifs_lpt_calc_hash(struct ubifs_info *c, u8 *hash);
/* lpt_commit.c */
int ubifs_lpt_start_commit(struct ubifs_info *c);
int ubifs_lpt_end_commit(struct ubifs_info *c);
int ubifs_lpt_post_commit(struct ubifs_info *c);
void ubifs_lpt_free(struct ubifs_info *c, int wr_only);
/* lprops.c */
const struct ubifs_lprops *ubifs_change_lp(struct ubifs_info *c,
const struct ubifs_lprops *lp,
int free, int dirty, int flags,
int idx_gc_cnt);
void ubifs_get_lp_stats(struct ubifs_info *c, struct ubifs_lp_stats *lst);
void ubifs_add_to_cat(struct ubifs_info *c, struct ubifs_lprops *lprops,
int cat);
void ubifs_replace_cat(struct ubifs_info *c, struct ubifs_lprops *old_lprops,
struct ubifs_lprops *new_lprops);
void ubifs_ensure_cat(struct ubifs_info *c, struct ubifs_lprops *lprops);
int ubifs_categorize_lprops(const struct ubifs_info *c,
const struct ubifs_lprops *lprops);
int ubifs_change_one_lp(struct ubifs_info *c, int lnum, int free, int dirty,
int flags_set, int flags_clean, int idx_gc_cnt);
int ubifs_update_one_lp(struct ubifs_info *c, int lnum, int free, int dirty,
int flags_set, int flags_clean);
int ubifs_read_one_lp(struct ubifs_info *c, int lnum, struct ubifs_lprops *lp);
const struct ubifs_lprops *ubifs_fast_find_free(struct ubifs_info *c);
const struct ubifs_lprops *ubifs_fast_find_empty(struct ubifs_info *c);
const struct ubifs_lprops *ubifs_fast_find_freeable(struct ubifs_info *c);
const struct ubifs_lprops *ubifs_fast_find_frdi_idx(struct ubifs_info *c);
int ubifs_calc_dark(const struct ubifs_info *c, int spc);
/* super.c */
int open_ubi(struct ubifs_info *c, const char *node);
void close_ubi(struct ubifs_info *c);
int open_target(struct ubifs_info *c);
int close_target(struct ubifs_info *c);
int ubifs_open_volume(struct ubifs_info *c, const char *volume_name);
int ubifs_close_volume(struct ubifs_info *c);
int check_volume_empty(struct ubifs_info *c);
void init_ubifs_info(struct ubifs_info *c, int program_type);
int init_constants_early(struct ubifs_info *c);
int init_constants_sb(struct ubifs_info *c);
void init_constants_master(struct ubifs_info *c);
int take_gc_lnum(struct ubifs_info *c);
int alloc_wbufs(struct ubifs_info *c);
void free_wbufs(struct ubifs_info *c);
void free_orphans(struct ubifs_info *c);
void destroy_journal(struct ubifs_info *c);
/* recovery.c */
int ubifs_recover_master_node(struct ubifs_info *c);
struct ubifs_scan_leb *ubifs_recover_leb(struct ubifs_info *c, int lnum,
int offs, void *sbuf, int jhead);
struct ubifs_scan_leb *ubifs_recover_log_leb(struct ubifs_info *c, int lnum,
int offs, void *sbuf);
int ubifs_recover_inl_heads(struct ubifs_info *c, void *sbuf);
int ubifs_rcvry_gc_commit(struct ubifs_info *c);
int ubifs_recover_size_accum(struct ubifs_info *c, union ubifs_key *key,
int deletion, loff_t new_size);
int ubifs_recover_size(struct ubifs_info *c, bool in_place);
void ubifs_destroy_size_tree(struct ubifs_info *c);
/* Normal UBIFS messages */
enum { ERR_LEVEL = 1, WARN_LEVEL, INFO_LEVEL, DEBUG_LEVEL };
#define ubifs_msg(c, fmt, ...) do { \
if (c->debug_level >= INFO_LEVEL) \
printf("<INFO> %s[%d] (%s): %s: " fmt "\n", \
c->program_name, getpid(), \
c->dev_name, __FUNCTION__, ##__VA_ARGS__); \
} while (0)
#define ubifs_warn(c, fmt, ...) do { \
if (c->debug_level >= WARN_LEVEL) \
printf("<WARN> %s[%d] (%s): %s: " fmt "\n", \
c->program_name, getpid(), \
c->dev_name, __FUNCTION__, ##__VA_ARGS__); \
} while (0)
#define ubifs_err(c, fmt, ...) do { \
if (c->debug_level >= ERR_LEVEL) \
printf("<ERROR> %s[%d] (%s): %s: " fmt "\n", \
c->program_name, getpid(), \
c->dev_name, __FUNCTION__, ##__VA_ARGS__); \
} while (0)
#endif /* !__UBIFS_H__ */