upd.c revision 92ad8f37509a7d9d5dd6e0092211b092a7ca7fb1
1801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy/* 2801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * Copyright (c) International Business Machines Corp., 2006 3801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * Copyright (c) Nokia Corporation, 2006 4801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 5801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * This program is free software; you can redistribute it and/or modify 6801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * it under the terms of the GNU General Public License as published by 7801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * the Free Software Foundation; either version 2 of the License, or 8801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * (at your option) any later version. 9801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 10801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * This program is distributed in the hope that it will be useful, 11801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * but WITHOUT ANY WARRANTY; without even the implied warranty of 12801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * the GNU General Public License for more details. 14801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 15801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * You should have received a copy of the GNU General Public License 16801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * along with this program; if not, write to the Free Software 17801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 19801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * Author: Artem Bityutskiy (Битюцкий Артём) 20801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 21801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * Jan 2007: Alexander Schmidt, hacked per-volume update. 22801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 23801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 24801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy/* 25801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * This file contains implementation of the volume update functionality. 26801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 27801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * The update operation is based on the per-volume update marker which is 28801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * stored in the volume table. The update marker is set before the update 29801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * starts, and removed after the update has been finished. So if the update was 30801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * interrupted by an unclean re-boot or due to some other reasons, the update 31801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * marker stays on the flash media and UBI finds it when it attaches the MTD 32801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * device next time. If the update marker is set for a volume, the volume is 33801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * treated as damaged and most I/O operations are prohibited. Only a new update 34801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * operation is allowed. 35801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 36801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * Note, in general it is possible to implement the update operation as a 37801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * transaction with a roll-back capability. 38801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 39801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 40801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy#include <linux/err.h> 41801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy#include <asm/uaccess.h> 42801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy#include <asm/div64.h> 43801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy#include "ubi.h" 44801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 45801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy/** 46801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * set_update_marker - set update marker. 47801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @ubi: UBI device description object 48801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @vol_id: volume ID 49801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 50801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * This function sets the update marker flag for volume @vol_id. Returns zero 51801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * in case of success and a negative error code in case of failure. 52801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 53801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiystatic int set_update_marker(struct ubi_device *ubi, int vol_id) 54801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy{ 55801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy int err; 56801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy struct ubi_vtbl_record vtbl_rec; 57801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy struct ubi_volume *vol = ubi->volumes[vol_id]; 58801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 59801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy dbg_msg("set update marker for volume %d", vol_id); 60801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 61801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (vol->upd_marker) { 62801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy ubi_assert(ubi->vtbl[vol_id].upd_marker); 63801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy dbg_msg("already set"); 64801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return 0; 65801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 66801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 67801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record)); 68801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vtbl_rec.upd_marker = 1; 69801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 70801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); 71801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_marker = 1; 72801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 73801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy} 74801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 75801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy/** 76801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * clear_update_marker - clear update marker. 77801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @ubi: UBI device description object 78801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @vol_id: volume ID 79801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @bytes: new data size in bytes 80801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 81801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * This function clears the update marker for volume @vol_id, sets new volume 82801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * data size and clears the "corrupted" flag (static volumes only). Returns 83801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * zero in case of success and a negative error code in case of failure. 84801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 85801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiystatic int clear_update_marker(struct ubi_device *ubi, int vol_id, long long bytes) 86801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy{ 87801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy int err; 88801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy uint64_t tmp; 89801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy struct ubi_vtbl_record vtbl_rec; 90801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy struct ubi_volume *vol = ubi->volumes[vol_id]; 91801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 92801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy dbg_msg("clear update marker for volume %d", vol_id); 93801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 94801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy memcpy(&vtbl_rec, &ubi->vtbl[vol_id], sizeof(struct ubi_vtbl_record)); 95801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy ubi_assert(vol->upd_marker && vtbl_rec.upd_marker); 96801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vtbl_rec.upd_marker = 0; 97801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 98801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (vol->vol_type == UBI_STATIC_VOLUME) { 99801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->corrupted = 0; 100801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->used_bytes = tmp = bytes; 101801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->last_eb_bytes = do_div(tmp, vol->usable_leb_size); 102801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->used_ebs = tmp; 103801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (vol->last_eb_bytes) 104801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->used_ebs += 1; 105801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy else 106801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->last_eb_bytes = vol->usable_leb_size; 107801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 108801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 109801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); 110801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_marker = 0; 111801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 112801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy} 113801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 114801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy/** 115801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * ubi_start_update - start volume update. 116801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @ubi: UBI device description object 117801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @vol_id: volume ID 118801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @bytes: update bytes 119801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 120801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * This function starts volume update operation. If @bytes is zero, the volume 121801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * is just wiped out. Returns zero in case of success and a negative error code 122801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * in case of failure. 123801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 124801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiyint ubi_start_update(struct ubi_device *ubi, int vol_id, long long bytes) 125801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy{ 126801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy int i, err; 127801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy uint64_t tmp; 128801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy struct ubi_volume *vol = ubi->volumes[vol_id]; 129801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 130801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy dbg_msg("start update of volume %d, %llu bytes", vol_id, bytes); 131801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->updating = 1; 132801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 133801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = set_update_marker(ubi, vol_id); 134801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err) 135801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 136801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 137801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy /* Before updating - wipe out the volume */ 138801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy for (i = 0; i < vol->reserved_pebs; i++) { 139801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = ubi_eba_unmap_leb(ubi, vol_id, i); 140801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err) 141801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 142801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 143801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 144801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (bytes == 0) { 145801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = clear_update_marker(ubi, vol_id, 0); 146801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err) 147801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 148801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = ubi_wl_flush(ubi); 149801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (!err) 150801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->updating = 0; 151801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 152801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 15392ad8f37509a7d9d5dd6e0092211b092a7ca7fb1Artem Bityutskiy vol->upd_buf = vmalloc(ubi->leb_size); 154801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (!vol->upd_buf) 155801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return -ENOMEM; 156801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 157801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy tmp = bytes; 158801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_ebs = !!do_div(tmp, vol->usable_leb_size); 159801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_ebs += tmp; 160801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_bytes = bytes; 161801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_received = 0; 162801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return 0; 163801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy} 164801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 165801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy/** 166801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * write_leb - write update data. 167801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @ubi: UBI device description object 168801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @vol_id: volume ID 169801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @lnum: logical eraseblock number 170801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @buf: data to write 171801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @len: data size 172801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @used_ebs: how many logical eraseblocks will this volume contain (static 173801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * volumes only) 174801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 175801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * This function writes update data to corresponding logical eraseblock. In 176801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * case of dynamic volume, this function checks if the data contains 0xFF bytes 177801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * at the end. If yes, the 0xFF bytes are cut and not written. So if the whole 178801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * buffer contains only 0xFF bytes, the LEB is left unmapped. 179801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 180801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * The reason why we skip the trailing 0xFF bytes in case of dynamic volume is 181801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * that we want to make sure that more data may be appended to the logical 182801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * eraseblock in future. Indeed, writing 0xFF bytes may have side effects and 183801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * this PEB won't be writable anymore. So if one writes the file-system image 184801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * to the UBI volume where 0xFFs mean free space - UBI makes sure this free 185801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * space is writable after the update. 186801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 187801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * We do not do this for static volumes because they are read-only. But this 188801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * also cannot be done because we have to store per-LEB CRC and the correct 189801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * data length. 190801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 191801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * This function returns zero in case of success and a negative error code in 192801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * case of failure. 193801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 194801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiystatic int write_leb(struct ubi_device *ubi, int vol_id, int lnum, void *buf, 195801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy int len, int used_ebs) 196801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy{ 197801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy int err, l; 198801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy struct ubi_volume *vol = ubi->volumes[vol_id]; 199801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 200801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (vol->vol_type == UBI_DYNAMIC_VOLUME) { 201801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy l = ALIGN(len, ubi->min_io_size); 202801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy memset(buf + len, 0xFF, l - len); 203801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 204801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy l = ubi_calc_data_len(ubi, buf, l); 205801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (l == 0) { 206801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy dbg_msg("all %d bytes contain 0xFF - skip", len); 207801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return 0; 208801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 209801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (len != l) 210801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy dbg_msg("skip last %d bytes (0xFF)", len - l); 211801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 212801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = ubi_eba_write_leb(ubi, vol_id, lnum, buf, 0, l, 213801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy UBI_UNKNOWN); 214801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } else { 215801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy /* 216801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * When writing static volume, and this is the last logical 217801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * eraseblock, the length (@len) does not have to be aligned to 218801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * the minimal flash I/O unit. The 'ubi_eba_write_leb_st()' 219801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * function accepts exact (unaligned) length and stores it in 220801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * the VID header. And it takes care of proper alignment by 221801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * padding the buffer. Here we just make sure the padding will 222801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * contain zeros, not random trash. 223801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 224801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy memset(buf + len, 0, vol->usable_leb_size - len); 225801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = ubi_eba_write_leb_st(ubi, vol_id, lnum, buf, len, 226801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy UBI_UNKNOWN, used_ebs); 227801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 228801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 229801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 230801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy} 231801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 232801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy/** 233801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * ubi_more_update_data - write more update data. 234801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @vol: volume description object 235801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @buf: write data (user-space memory buffer) 236801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @count: how much bytes to write 237801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 238801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * This function writes more data to the volume which is being updated. It may 239801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * be called arbitrary number of times until all of the update data arrive. 240801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * This function returns %0 in case of success, number of bytes written during 241801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * the last call if the whole volume update was successfully finished, and a 242801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * negative error code in case of failure. 243801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 244801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiyint ubi_more_update_data(struct ubi_device *ubi, int vol_id, 245801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy const void __user *buf, int count) 246801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy{ 247801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy uint64_t tmp; 248801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy struct ubi_volume *vol = ubi->volumes[vol_id]; 249801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy int lnum, offs, err = 0, len, to_write = count; 250801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 251801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy dbg_msg("write %d of %lld bytes, %lld already passed", 252801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy count, vol->upd_bytes, vol->upd_received); 253801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 254801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (ubi->ro_mode) 255801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return -EROFS; 256801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 257801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy tmp = vol->upd_received; 258801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy offs = do_div(tmp, vol->usable_leb_size); 259801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy lnum = tmp; 260801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 261801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (vol->upd_received + count > vol->upd_bytes) 262801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy to_write = count = vol->upd_bytes - vol->upd_received; 263801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 264801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy /* 265801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * When updating volumes, we accumulate whole logical eraseblock of 266801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * data and write it at once. 267801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 268801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (offs != 0) { 269801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy /* 270801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * This is a write to the middle of the logical eraseblock. We 271801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * copy the data to our update buffer and wait for more data or 272801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * flush it if the whole eraseblock is written or the update 273801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * is finished. 274801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 275801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 276801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy len = vol->usable_leb_size - offs; 277801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (len > count) 278801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy len = count; 279801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 280801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = copy_from_user(vol->upd_buf + offs, buf, len); 281801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err) 282801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return -EFAULT; 283801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 284801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (offs + len == vol->usable_leb_size || 285801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_received + len == vol->upd_bytes) { 286801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy int flush_len = offs + len; 287801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 288801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy /* 289801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * OK, we gathered either the whole eraseblock or this 290801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * is the last chunk, it's time to flush the buffer. 291801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 292801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy ubi_assert(flush_len <= vol->usable_leb_size); 293801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = write_leb(ubi, vol_id, lnum, vol->upd_buf, 294801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy flush_len, vol->upd_ebs); 295801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err) 296801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 297801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 298801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 299801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_received += len; 300801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy count -= len; 301801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy buf += len; 302801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy lnum += 1; 303801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 304801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 305801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy /* 306801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * If we've got more to write, let's continue. At this point we know we 307801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * are starting from the beginning of an eraseblock. 308801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 309801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy while (count) { 310801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (count > vol->usable_leb_size) 311801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy len = vol->usable_leb_size; 312801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy else 313801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy len = count; 314801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 315801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = copy_from_user(vol->upd_buf, buf, len); 316801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err) 317801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return -EFAULT; 318801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 319801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (len == vol->usable_leb_size || 320801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_received + len == vol->upd_bytes) { 321801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = write_leb(ubi, vol_id, lnum, vol->upd_buf, len, 322801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_ebs); 323801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err) 324801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy break; 325801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 326801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 327801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_received += len; 328801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy count -= len; 329801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy lnum += 1; 330801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy buf += len; 331801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 332801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 333801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy ubi_assert(vol->upd_received <= vol->upd_bytes); 334801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (vol->upd_received == vol->upd_bytes) { 335801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy /* The update is finished, clear the update marker */ 336801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = clear_update_marker(ubi, vol_id, vol->upd_bytes); 337801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err) 338801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 339801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = ubi_wl_flush(ubi); 340801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err == 0) { 341801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = to_write; 34292ad8f37509a7d9d5dd6e0092211b092a7ca7fb1Artem Bityutskiy vfree(vol->upd_buf); 343801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->updating = 0; 344801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 345801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 346801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 347801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 348801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy} 349