^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * This file is part of UBIFS.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2006-2008 Nokia Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Authors: Artem Bityutskiy (Битюцкий Артём)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Adrian Hunter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * This file implements UBIFS superblock. The superblock is stored at the first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * LEB of the volume and is never changed by UBIFS. Only user-space tools may
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * change it. The superblock node mostly contains geometry information.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "ubifs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/math64.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/uuid.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * Default journal size in logical eraseblocks as a percent of total
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * flash size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define DEFAULT_JNL_PERCENT 5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /* Default maximum journal size in bytes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define DEFAULT_MAX_JNL (32*1024*1024)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) /* Default indexing tree fanout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define DEFAULT_FANOUT 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) /* Default number of data journal heads */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define DEFAULT_JHEADS_CNT 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /* Default positions of different LEBs in the main area */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define DEFAULT_IDX_LEB 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define DEFAULT_DATA_LEB 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define DEFAULT_GC_LEB 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) /* Default number of LEB numbers in LPT's save table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #define DEFAULT_LSAVE_CNT 256
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /* Default reserved pool size as a percent of maximum free space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #define DEFAULT_RP_PERCENT 5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) /* The default maximum size of reserved pool in bytes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #define DEFAULT_MAX_RP_SIZE (5*1024*1024)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /* Default time granularity in nanoseconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #define DEFAULT_TIME_GRAN 1000000000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static int get_default_compressor(struct ubifs_info *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (ubifs_compr_present(c, UBIFS_COMPR_LZO))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) return UBIFS_COMPR_LZO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (ubifs_compr_present(c, UBIFS_COMPR_ZLIB))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) return UBIFS_COMPR_ZLIB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return UBIFS_COMPR_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * create_default_filesystem - format empty UBI volume.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * This function creates default empty file-system. Returns zero in case of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * success and a negative error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static int create_default_filesystem(struct ubifs_info *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct ubifs_sb_node *sup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) struct ubifs_mst_node *mst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) struct ubifs_idx_node *idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct ubifs_branch *br;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) struct ubifs_ino_node *ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) struct ubifs_cs_node *cs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) union ubifs_key key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) int err, tmp, jnl_lebs, log_lebs, max_buds, main_lebs, main_first;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) int lpt_lebs, lpt_first, orph_lebs, big_lpt, ino_waste, sup_flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) int min_leb_cnt = UBIFS_MIN_LEB_CNT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) int idx_node_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) long long tmp64, main_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) __le64 tmp_le64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) struct timespec64 ts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) u8 hash[UBIFS_HASH_ARR_SZ];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) u8 hash_lpt[UBIFS_HASH_ARR_SZ];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) /* Some functions called from here depend on the @c->key_len filed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) c->key_len = UBIFS_SK_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * First of all, we have to calculate default file-system geometry -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * log size, journal size, etc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (c->leb_cnt < 0x7FFFFFFF / DEFAULT_JNL_PERCENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /* We can first multiply then divide and have no overflow */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) jnl_lebs = c->leb_cnt * DEFAULT_JNL_PERCENT / 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) jnl_lebs = (c->leb_cnt / 100) * DEFAULT_JNL_PERCENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (jnl_lebs < UBIFS_MIN_JNL_LEBS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) jnl_lebs = UBIFS_MIN_JNL_LEBS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (jnl_lebs * c->leb_size > DEFAULT_MAX_JNL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) jnl_lebs = DEFAULT_MAX_JNL / c->leb_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * The log should be large enough to fit reference nodes for all bud
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) * LEBs. Because buds do not have to start from the beginning of LEBs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * (half of the LEB may contain committed data), the log should
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) * generally be larger, make it twice as large.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) tmp = 2 * (c->ref_node_alsz * jnl_lebs) + c->leb_size - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) log_lebs = tmp / c->leb_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) /* Plus one LEB reserved for commit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) log_lebs += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (c->leb_cnt - min_leb_cnt > 8) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) /* And some extra space to allow writes while committing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) log_lebs += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) min_leb_cnt += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) max_buds = jnl_lebs - log_lebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (max_buds < UBIFS_MIN_BUD_LEBS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) max_buds = UBIFS_MIN_BUD_LEBS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) * Orphan nodes are stored in a separate area. One node can store a lot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) * of orphan inode numbers, but when new orphan comes we just add a new
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) * orphan node. At some point the nodes are consolidated into one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) * orphan node.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) orph_lebs = UBIFS_MIN_ORPH_LEBS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (c->leb_cnt - min_leb_cnt > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) * For debugging purposes it is better to have at least 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) * orphan LEBs, because the orphan subsystem would need to do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) * consolidations and would be stressed more.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) orph_lebs += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) main_lebs = c->leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS - log_lebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) main_lebs -= orph_lebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) lpt_first = UBIFS_LOG_LNUM + log_lebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) c->lsave_cnt = DEFAULT_LSAVE_CNT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) c->max_leb_cnt = c->leb_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) err = ubifs_create_dflt_lpt(c, &main_lebs, lpt_first, &lpt_lebs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) &big_lpt, hash_lpt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) dbg_gen("LEB Properties Tree created (LEBs %d-%d)", lpt_first,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) lpt_first + lpt_lebs - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) main_first = c->leb_cnt - main_lebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) sup = kzalloc(ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) mst = kzalloc(c->mst_node_alsz, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) idx_node_size = ubifs_idx_node_sz(c, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) idx = kzalloc(ALIGN(idx_node_size, c->min_io_size), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) ino = kzalloc(ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) cs = kzalloc(ALIGN(UBIFS_CS_NODE_SZ, c->min_io_size), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) if (!sup || !mst || !idx || !ino || !cs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) /* Create default superblock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) tmp64 = (long long)max_buds * c->leb_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) if (big_lpt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) sup_flags |= UBIFS_FLG_BIGLPT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if (ubifs_default_version > 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) sup_flags |= UBIFS_FLG_DOUBLE_HASH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) if (ubifs_authenticated(c)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) sup_flags |= UBIFS_FLG_AUTHENTICATION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) sup->hash_algo = cpu_to_le16(c->auth_hash_algo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) err = ubifs_hmac_wkm(c, sup->hmac_wkm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) sup->hash_algo = cpu_to_le16(0xffff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) sup->ch.node_type = UBIFS_SB_NODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) sup->key_hash = UBIFS_KEY_HASH_R5;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) sup->flags = cpu_to_le32(sup_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) sup->min_io_size = cpu_to_le32(c->min_io_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) sup->leb_size = cpu_to_le32(c->leb_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) sup->leb_cnt = cpu_to_le32(c->leb_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) sup->max_leb_cnt = cpu_to_le32(c->max_leb_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) sup->max_bud_bytes = cpu_to_le64(tmp64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) sup->log_lebs = cpu_to_le32(log_lebs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) sup->lpt_lebs = cpu_to_le32(lpt_lebs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) sup->orph_lebs = cpu_to_le32(orph_lebs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) sup->jhead_cnt = cpu_to_le32(DEFAULT_JHEADS_CNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) sup->fanout = cpu_to_le32(DEFAULT_FANOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) sup->lsave_cnt = cpu_to_le32(c->lsave_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) sup->fmt_version = cpu_to_le32(ubifs_default_version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) sup->time_gran = cpu_to_le32(DEFAULT_TIME_GRAN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) if (c->mount_opts.override_compr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) sup->default_compr = cpu_to_le16(c->mount_opts.compr_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) sup->default_compr = cpu_to_le16(get_default_compressor(c));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) generate_random_uuid(sup->uuid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) main_bytes = (long long)main_lebs * c->leb_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) tmp64 = div_u64(main_bytes * DEFAULT_RP_PERCENT, 100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) if (tmp64 > DEFAULT_MAX_RP_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) tmp64 = DEFAULT_MAX_RP_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) sup->rp_size = cpu_to_le64(tmp64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) sup->ro_compat_version = cpu_to_le32(UBIFS_RO_COMPAT_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) dbg_gen("default superblock created at LEB 0:0");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) /* Create default master node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) mst->ch.node_type = UBIFS_MST_NODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) mst->log_lnum = cpu_to_le32(UBIFS_LOG_LNUM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) mst->highest_inum = cpu_to_le64(UBIFS_FIRST_INO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) mst->cmt_no = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) mst->root_lnum = cpu_to_le32(main_first + DEFAULT_IDX_LEB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) mst->root_offs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) tmp = ubifs_idx_node_sz(c, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) mst->root_len = cpu_to_le32(tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) mst->gc_lnum = cpu_to_le32(main_first + DEFAULT_GC_LEB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) mst->ihead_lnum = cpu_to_le32(main_first + DEFAULT_IDX_LEB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) mst->ihead_offs = cpu_to_le32(ALIGN(tmp, c->min_io_size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) mst->index_size = cpu_to_le64(ALIGN(tmp, 8));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) mst->lpt_lnum = cpu_to_le32(c->lpt_lnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) mst->lpt_offs = cpu_to_le32(c->lpt_offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) mst->nhead_lnum = cpu_to_le32(c->nhead_lnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) mst->nhead_offs = cpu_to_le32(c->nhead_offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) mst->ltab_lnum = cpu_to_le32(c->ltab_lnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) mst->ltab_offs = cpu_to_le32(c->ltab_offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) mst->lsave_lnum = cpu_to_le32(c->lsave_lnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) mst->lsave_offs = cpu_to_le32(c->lsave_offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) mst->lscan_lnum = cpu_to_le32(main_first);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) mst->empty_lebs = cpu_to_le32(main_lebs - 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) mst->idx_lebs = cpu_to_le32(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) mst->leb_cnt = cpu_to_le32(c->leb_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) ubifs_copy_hash(c, hash_lpt, mst->hash_lpt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) /* Calculate lprops statistics */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) tmp64 = main_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) tmp64 -= ALIGN(ubifs_idx_node_sz(c, 1), c->min_io_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) tmp64 -= ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) mst->total_free = cpu_to_le64(tmp64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) tmp64 = ALIGN(ubifs_idx_node_sz(c, 1), c->min_io_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) ino_waste = ALIGN(UBIFS_INO_NODE_SZ, c->min_io_size) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) UBIFS_INO_NODE_SZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) tmp64 += ino_waste;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) tmp64 -= ALIGN(ubifs_idx_node_sz(c, 1), 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) mst->total_dirty = cpu_to_le64(tmp64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) /* The indexing LEB does not contribute to dark space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) tmp64 = ((long long)(c->main_lebs - 1) * c->dark_wm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) mst->total_dark = cpu_to_le64(tmp64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) mst->total_used = cpu_to_le64(UBIFS_INO_NODE_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) dbg_gen("default master node created at LEB %d:0", UBIFS_MST_LNUM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) /* Create the root indexing node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) c->key_fmt = UBIFS_SIMPLE_KEY_FMT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) c->key_hash = key_r5_hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) idx->ch.node_type = UBIFS_IDX_NODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) idx->child_cnt = cpu_to_le16(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) ino_key_init(c, &key, UBIFS_ROOT_INO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) br = ubifs_idx_branch(c, idx, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) key_write_idx(c, &key, &br->key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) br->lnum = cpu_to_le32(main_first + DEFAULT_DATA_LEB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) br->len = cpu_to_le32(UBIFS_INO_NODE_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) dbg_gen("default root indexing node created LEB %d:0",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) main_first + DEFAULT_IDX_LEB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) /* Create default root inode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) ino_key_init_flash(c, &ino->key, UBIFS_ROOT_INO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) ino->ch.node_type = UBIFS_INO_NODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) ino->creat_sqnum = cpu_to_le64(++c->max_sqnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) ino->nlink = cpu_to_le32(2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) ktime_get_coarse_real_ts64(&ts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) tmp_le64 = cpu_to_le64(ts.tv_sec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) ino->atime_sec = tmp_le64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) ino->ctime_sec = tmp_le64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) ino->mtime_sec = tmp_le64;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) ino->atime_nsec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) ino->ctime_nsec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) ino->mtime_nsec = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) ino->mode = cpu_to_le32(S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) ino->size = cpu_to_le64(UBIFS_INO_NODE_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) /* Set compression enabled by default */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) ino->flags = cpu_to_le32(UBIFS_COMPR_FL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) dbg_gen("root inode created at LEB %d:0",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) main_first + DEFAULT_DATA_LEB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) * The first node in the log has to be the commit start node. This is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) * always the case during normal file-system operation. Write a fake
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) * commit start node to the log.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) cs->ch.node_type = UBIFS_CS_NODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) err = ubifs_write_node_hmac(c, sup, UBIFS_SB_NODE_SZ, 0, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) offsetof(struct ubifs_sb_node, hmac));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) err = ubifs_write_node(c, ino, UBIFS_INO_NODE_SZ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) main_first + DEFAULT_DATA_LEB, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) ubifs_node_calc_hash(c, ino, hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) ubifs_copy_hash(c, hash, ubifs_branch_hash(c, br));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) err = ubifs_write_node(c, idx, idx_node_size, main_first + DEFAULT_IDX_LEB, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) ubifs_node_calc_hash(c, idx, hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) ubifs_copy_hash(c, hash, mst->hash_root_idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) err = ubifs_write_node_hmac(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) offsetof(struct ubifs_mst_node, hmac));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) err = ubifs_write_node_hmac(c, mst, UBIFS_MST_NODE_SZ, UBIFS_MST_LNUM + 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 0, offsetof(struct ubifs_mst_node, hmac));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) err = ubifs_write_node(c, cs, UBIFS_CS_NODE_SZ, UBIFS_LOG_LNUM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) ubifs_msg(c, "default file-system created");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) kfree(sup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) kfree(mst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) kfree(idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) kfree(ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) kfree(cs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) * validate_sb - validate superblock node.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) * @sup: superblock node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) * This function validates superblock node @sup. Since most of data was read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) * from the superblock and stored in @c, the function validates fields in @c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) * instead. Returns zero in case of success and %-EINVAL in case of validation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) static int validate_sb(struct ubifs_info *c, struct ubifs_sb_node *sup)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) long long max_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) int err = 1, min_leb_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) if (!c->key_hash) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) err = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) if (sup->key_fmt != UBIFS_SIMPLE_KEY_FMT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) err = 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) if (le32_to_cpu(sup->min_io_size) != c->min_io_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) ubifs_err(c, "min. I/O unit mismatch: %d in superblock, %d real",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) le32_to_cpu(sup->min_io_size), c->min_io_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) if (le32_to_cpu(sup->leb_size) != c->leb_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) ubifs_err(c, "LEB size mismatch: %d in superblock, %d real",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) le32_to_cpu(sup->leb_size), c->leb_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) if (c->log_lebs < UBIFS_MIN_LOG_LEBS ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) c->lpt_lebs < UBIFS_MIN_LPT_LEBS ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) c->orph_lebs < UBIFS_MIN_ORPH_LEBS ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) c->main_lebs < UBIFS_MIN_MAIN_LEBS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) err = 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) * Calculate minimum allowed amount of main area LEBs. This is very
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) * similar to %UBIFS_MIN_LEB_CNT, but we take into account real what we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) * have just read from the superblock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) min_leb_cnt = UBIFS_SB_LEBS + UBIFS_MST_LEBS + c->log_lebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) min_leb_cnt += c->lpt_lebs + c->orph_lebs + c->jhead_cnt + 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) if (c->leb_cnt < min_leb_cnt || c->leb_cnt > c->vi.size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) ubifs_err(c, "bad LEB count: %d in superblock, %d on UBI volume, %d minimum required",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) c->leb_cnt, c->vi.size, min_leb_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) if (c->max_leb_cnt < c->leb_cnt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) ubifs_err(c, "max. LEB count %d less than LEB count %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) c->max_leb_cnt, c->leb_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) if (c->main_lebs < UBIFS_MIN_MAIN_LEBS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) ubifs_err(c, "too few main LEBs count %d, must be at least %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) c->main_lebs, UBIFS_MIN_MAIN_LEBS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) max_bytes = (long long)c->leb_size * UBIFS_MIN_BUD_LEBS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) if (c->max_bud_bytes < max_bytes) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) ubifs_err(c, "too small journal (%lld bytes), must be at least %lld bytes",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) c->max_bud_bytes, max_bytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) max_bytes = (long long)c->leb_size * c->main_lebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) if (c->max_bud_bytes > max_bytes) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) ubifs_err(c, "too large journal size (%lld bytes), only %lld bytes available in the main area",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) c->max_bud_bytes, max_bytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) if (c->jhead_cnt < NONDATA_JHEADS_CNT + 1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) c->jhead_cnt > NONDATA_JHEADS_CNT + UBIFS_MAX_JHEADS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) err = 9;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) if (c->fanout < UBIFS_MIN_FANOUT ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) ubifs_idx_node_sz(c, c->fanout) > c->leb_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) err = 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) if (c->lsave_cnt < 0 || (c->lsave_cnt > DEFAULT_LSAVE_CNT &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) c->lsave_cnt > c->max_leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) c->log_lebs - c->lpt_lebs - c->orph_lebs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) err = 11;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) if (UBIFS_SB_LEBS + UBIFS_MST_LEBS + c->log_lebs + c->lpt_lebs +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) c->orph_lebs + c->main_lebs != c->leb_cnt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) err = 12;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) if (c->default_compr >= UBIFS_COMPR_TYPES_CNT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) err = 13;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) if (c->rp_size < 0 || max_bytes < c->rp_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) err = 14;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) if (le32_to_cpu(sup->time_gran) > 1000000000 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) le32_to_cpu(sup->time_gran) < 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) err = 15;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) if (!c->double_hash && c->fmt_version >= 5) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) err = 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) if (c->encrypted && c->fmt_version < 5) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) err = 17;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) goto failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) failed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) ubifs_err(c, "bad superblock, error %d", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) ubifs_dump_node(c, sup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) * ubifs_read_sb_node - read superblock node.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) * This function returns a pointer to the superblock node or a negative error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) * code. Note, the user of this function is responsible of kfree()'ing the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) * returned superblock buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) static struct ubifs_sb_node *ubifs_read_sb_node(struct ubifs_info *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) struct ubifs_sb_node *sup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) sup = kmalloc(ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size), GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) if (!sup)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) err = ubifs_read_node(c, sup, UBIFS_SB_NODE, UBIFS_SB_NODE_SZ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) UBIFS_SB_LNUM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) kfree(sup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) return sup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) static int authenticate_sb_node(struct ubifs_info *c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) const struct ubifs_sb_node *sup)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) unsigned int sup_flags = le32_to_cpu(sup->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) u8 hmac_wkm[UBIFS_HMAC_ARR_SZ];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) int authenticated = !!(sup_flags & UBIFS_FLG_AUTHENTICATION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) int hash_algo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) if (c->authenticated && !authenticated) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) ubifs_err(c, "authenticated FS forced, but found FS without authentication");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) if (!c->authenticated && authenticated) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) ubifs_err(c, "authenticated FS found, but no key given");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) ubifs_msg(c, "Mounting in %sauthenticated mode",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) c->authenticated ? "" : "un");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) if (!c->authenticated)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) if (!IS_ENABLED(CONFIG_UBIFS_FS_AUTHENTICATION))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) hash_algo = le16_to_cpu(sup->hash_algo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) if (hash_algo >= HASH_ALGO__LAST) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) ubifs_err(c, "superblock uses unknown hash algo %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) hash_algo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) if (strcmp(hash_algo_name[hash_algo], c->auth_hash_name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) ubifs_err(c, "This filesystem uses %s for hashing,"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) " but %s is specified", hash_algo_name[hash_algo],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) c->auth_hash_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) * The super block node can either be authenticated by a HMAC or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) * by a signature in a ubifs_sig_node directly following the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) * super block node to support offline image creation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) if (ubifs_hmac_zero(c, sup->hmac)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) err = ubifs_sb_verify_signature(c, sup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) err = ubifs_hmac_wkm(c, hmac_wkm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) if (ubifs_check_hmac(c, hmac_wkm, sup->hmac_wkm)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) ubifs_err(c, "provided key does not fit");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) return -ENOKEY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) err = ubifs_node_verify_hmac(c, sup, sizeof(*sup),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) offsetof(struct ubifs_sb_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) hmac));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) ubifs_err(c, "Failed to authenticate superblock: %d", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) * ubifs_write_sb_node - write superblock node.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) * @sup: superblock node read with 'ubifs_read_sb_node()'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) * This function returns %0 on success and a negative error code on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) int ubifs_write_sb_node(struct ubifs_info *c, struct ubifs_sb_node *sup)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) int len = ALIGN(UBIFS_SB_NODE_SZ, c->min_io_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) err = ubifs_prepare_node_hmac(c, sup, UBIFS_SB_NODE_SZ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) offsetof(struct ubifs_sb_node, hmac), 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) return ubifs_leb_change(c, UBIFS_SB_LNUM, sup, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) * ubifs_read_superblock - read superblock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) * This function finds, reads and checks the superblock. If an empty UBI volume
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) * is being mounted, this function creates default superblock. Returns zero in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) * case of success, and a negative error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) int ubifs_read_superblock(struct ubifs_info *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) int err, sup_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) struct ubifs_sb_node *sup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) if (c->empty) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) err = create_default_filesystem(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) sup = ubifs_read_sb_node(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) if (IS_ERR(sup))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) return PTR_ERR(sup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) c->sup_node = sup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) c->fmt_version = le32_to_cpu(sup->fmt_version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) c->ro_compat_version = le32_to_cpu(sup->ro_compat_version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) * The software supports all previous versions but not future versions,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) * due to the unavailability of time-travelling equipment.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) if (c->fmt_version > UBIFS_FORMAT_VERSION) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) ubifs_assert(c, !c->ro_media || c->ro_mount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) if (!c->ro_mount ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) c->ro_compat_version > UBIFS_RO_COMPAT_VERSION) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) ubifs_err(c, "on-flash format version is w%d/r%d, but software only supports up to version w%d/r%d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) c->fmt_version, c->ro_compat_version,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) UBIFS_FORMAT_VERSION,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) UBIFS_RO_COMPAT_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) if (c->ro_compat_version <= UBIFS_RO_COMPAT_VERSION) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) ubifs_msg(c, "only R/O mounting is possible");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) err = -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) * The FS is mounted R/O, and the media format is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) * R/O-compatible with the UBIFS implementation, so we can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) * mount.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) c->rw_incompat = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) if (c->fmt_version < 3) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) ubifs_err(c, "on-flash format version %d is not supported",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) c->fmt_version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) switch (sup->key_hash) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) case UBIFS_KEY_HASH_R5:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) c->key_hash = key_r5_hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) c->key_hash_type = UBIFS_KEY_HASH_R5;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) case UBIFS_KEY_HASH_TEST:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) c->key_hash = key_test_hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) c->key_hash_type = UBIFS_KEY_HASH_TEST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) c->key_fmt = sup->key_fmt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) switch (c->key_fmt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) case UBIFS_SIMPLE_KEY_FMT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) c->key_len = UBIFS_SK_LEN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) ubifs_err(c, "unsupported key format");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) c->leb_cnt = le32_to_cpu(sup->leb_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) c->max_leb_cnt = le32_to_cpu(sup->max_leb_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) c->max_bud_bytes = le64_to_cpu(sup->max_bud_bytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) c->log_lebs = le32_to_cpu(sup->log_lebs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) c->lpt_lebs = le32_to_cpu(sup->lpt_lebs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) c->orph_lebs = le32_to_cpu(sup->orph_lebs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) c->jhead_cnt = le32_to_cpu(sup->jhead_cnt) + NONDATA_JHEADS_CNT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) c->fanout = le32_to_cpu(sup->fanout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) c->lsave_cnt = le32_to_cpu(sup->lsave_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) c->rp_size = le64_to_cpu(sup->rp_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) c->rp_uid = make_kuid(&init_user_ns, le32_to_cpu(sup->rp_uid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) c->rp_gid = make_kgid(&init_user_ns, le32_to_cpu(sup->rp_gid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) sup_flags = le32_to_cpu(sup->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) if (!c->mount_opts.override_compr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) c->default_compr = le16_to_cpu(sup->default_compr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) c->vfs_sb->s_time_gran = le32_to_cpu(sup->time_gran);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) memcpy(&c->uuid, &sup->uuid, 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) c->big_lpt = !!(sup_flags & UBIFS_FLG_BIGLPT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) c->space_fixup = !!(sup_flags & UBIFS_FLG_SPACE_FIXUP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) c->double_hash = !!(sup_flags & UBIFS_FLG_DOUBLE_HASH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) c->encrypted = !!(sup_flags & UBIFS_FLG_ENCRYPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) err = authenticate_sb_node(c, sup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) if ((sup_flags & ~UBIFS_FLG_MASK) != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) ubifs_err(c, "Unknown feature flags found: %#x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) sup_flags & ~UBIFS_FLG_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) if (!IS_ENABLED(CONFIG_FS_ENCRYPTION) && c->encrypted) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) ubifs_err(c, "file system contains encrypted files but UBIFS"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) " was built without crypto support.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) /* Automatically increase file system size to the maximum size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) if (c->leb_cnt < c->vi.size && c->leb_cnt < c->max_leb_cnt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) int old_leb_cnt = c->leb_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) c->leb_cnt = min_t(int, c->max_leb_cnt, c->vi.size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) sup->leb_cnt = cpu_to_le32(c->leb_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) c->superblock_need_write = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) dbg_mnt("Auto resizing from %d LEBs to %d LEBs",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) old_leb_cnt, c->leb_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) c->log_bytes = (long long)c->log_lebs * c->leb_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) c->log_last = UBIFS_LOG_LNUM + c->log_lebs - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) c->lpt_first = UBIFS_LOG_LNUM + c->log_lebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) c->lpt_last = c->lpt_first + c->lpt_lebs - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) c->orph_first = c->lpt_last + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) c->orph_last = c->orph_first + c->orph_lebs - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) c->main_lebs = c->leb_cnt - UBIFS_SB_LEBS - UBIFS_MST_LEBS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) c->main_lebs -= c->log_lebs + c->lpt_lebs + c->orph_lebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) c->main_first = c->leb_cnt - c->main_lebs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) err = validate_sb(c, sup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) * fixup_leb - fixup/unmap an LEB containing free space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) * @lnum: the LEB number to fix up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) * @len: number of used bytes in LEB (starting at offset 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) * This function reads the contents of the given LEB number @lnum, then fixes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) * it up, so that empty min. I/O units in the end of LEB are actually erased on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) * flash (rather than being just all-0xff real data). If the LEB is completely
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) * empty, it is simply unmapped.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) static int fixup_leb(struct ubifs_info *c, int lnum, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) ubifs_assert(c, len >= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) ubifs_assert(c, len % c->min_io_size == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) ubifs_assert(c, len < c->leb_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) if (len == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) dbg_mnt("unmap empty LEB %d", lnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) return ubifs_leb_unmap(c, lnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) dbg_mnt("fixup LEB %d, data len %d", lnum, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) err = ubifs_leb_read(c, lnum, c->sbuf, 0, len, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) return ubifs_leb_change(c, lnum, c->sbuf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) * fixup_free_space - find & remap all LEBs containing free space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) * This function walks through all LEBs in the filesystem and fiexes up those
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) * containing free/empty space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) static int fixup_free_space(struct ubifs_info *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) int lnum, err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) struct ubifs_lprops *lprops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) ubifs_get_lprops(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) /* Fixup LEBs in the master area */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) for (lnum = UBIFS_MST_LNUM; lnum < UBIFS_LOG_LNUM; lnum++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) err = fixup_leb(c, lnum, c->mst_offs + c->mst_node_alsz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) /* Unmap unused log LEBs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) lnum = ubifs_next_log_lnum(c, c->lhead_lnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) while (lnum != c->ltail_lnum) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) err = fixup_leb(c, lnum, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) lnum = ubifs_next_log_lnum(c, lnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) * Fixup the log head which contains the only a CS node at the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) * beginning.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) err = fixup_leb(c, c->lhead_lnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) ALIGN(UBIFS_CS_NODE_SZ, c->min_io_size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) /* Fixup LEBs in the LPT area */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) for (lnum = c->lpt_first; lnum <= c->lpt_last; lnum++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) int free = c->ltab[lnum - c->lpt_first].free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) if (free > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) err = fixup_leb(c, lnum, c->leb_size - free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) /* Unmap LEBs in the orphans area */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) for (lnum = c->orph_first; lnum <= c->orph_last; lnum++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) err = fixup_leb(c, lnum, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) /* Fixup LEBs in the main area */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) for (lnum = c->main_first; lnum < c->leb_cnt; lnum++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) lprops = ubifs_lpt_lookup(c, lnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) if (IS_ERR(lprops)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) err = PTR_ERR(lprops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) if (lprops->free > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) err = fixup_leb(c, lnum, c->leb_size - lprops->free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) ubifs_release_lprops(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) * ubifs_fixup_free_space - find & fix all LEBs with free space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) * This function fixes up LEBs containing free space on first mount, if the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) * appropriate flag was set when the FS was created. Each LEB with one or more
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) * empty min. I/O unit (i.e. free-space-count > 0) is re-written, to make sure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) * the free space is actually erased. E.g., this is necessary for some NAND
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) * chips, since the free space may have been programmed like real "0xff" data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) * (generating a non-0xff ECC), causing future writes to the not-really-erased
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) * NAND pages to behave badly. After the space is fixed up, the superblock flag
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) * is cleared, so that this is skipped for all future mounts.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) int ubifs_fixup_free_space(struct ubifs_info *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) struct ubifs_sb_node *sup = c->sup_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) ubifs_assert(c, c->space_fixup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) ubifs_assert(c, !c->ro_mount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) ubifs_msg(c, "start fixing up free space");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) err = fixup_free_space(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) /* Free-space fixup is no longer required */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) c->space_fixup = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) sup->flags &= cpu_to_le32(~UBIFS_FLG_SPACE_FIXUP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) c->superblock_need_write = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) ubifs_msg(c, "free space fixup complete");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) int ubifs_enable_encryption(struct ubifs_info *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) struct ubifs_sb_node *sup = c->sup_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) if (!IS_ENABLED(CONFIG_FS_ENCRYPTION))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) if (c->encrypted)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) if (c->ro_mount || c->ro_media)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) return -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) if (c->fmt_version < 5) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) ubifs_err(c, "on-flash format version 5 is needed for encryption");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) sup->flags |= cpu_to_le32(UBIFS_FLG_ENCRYPTION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) err = ubifs_write_sb_node(c, sup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) c->encrypted = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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