upd.c revision e653879c269735c9ff6684e03edf1d4e041ff3d3
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/* 25e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * This file contains implementation of the volume update and atomic LEB change 26e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * functionality. 27801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 28801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * The update operation is based on the per-volume update marker which is 29801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * stored in the volume table. The update marker is set before the update 30801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * starts, and removed after the update has been finished. So if the update was 31801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * interrupted by an unclean re-boot or due to some other reasons, the update 32801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * marker stays on the flash media and UBI finds it when it attaches the MTD 33801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * device next time. If the update marker is set for a volume, the volume is 34801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * treated as damaged and most I/O operations are prohibited. Only a new update 35801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * operation is allowed. 36801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 37801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * Note, in general it is possible to implement the update operation as a 38801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * transaction with a roll-back capability. 39801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 40801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 41801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy#include <linux/err.h> 42801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy#include <asm/uaccess.h> 43801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy#include <asm/div64.h> 44801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy#include "ubi.h" 45801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 46801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy/** 47801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * set_update_marker - set update marker. 48801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @ubi: UBI device description object 491b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy * @vol: volume description object 50801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 511b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy * This function sets the update marker flag for volume @vol. Returns zero 52801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * in case of success and a negative error code in case of failure. 53801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 541b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiystatic int set_update_marker(struct ubi_device *ubi, struct ubi_volume *vol) 55801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy{ 56801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy int err; 57801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy struct ubi_vtbl_record vtbl_rec; 58801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 591b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy dbg_msg("set update marker for volume %d", vol->vol_id); 60801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 61801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (vol->upd_marker) { 621b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy ubi_assert(ubi->vtbl[vol->vol_id].upd_marker); 63801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy dbg_msg("already set"); 64801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return 0; 65801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 66801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 671b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy memcpy(&vtbl_rec, &ubi->vtbl[vol->vol_id], 681b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy sizeof(struct ubi_vtbl_record)); 69801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vtbl_rec.upd_marker = 1; 70801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 71cae0a77125467c42f0918e78457913ee4a2f925bArtem Bityutskiy mutex_lock(&ubi->volumes_mutex); 721b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy err = ubi_change_vtbl_record(ubi, vol->vol_id, &vtbl_rec); 73cae0a77125467c42f0918e78457913ee4a2f925bArtem Bityutskiy mutex_unlock(&ubi->volumes_mutex); 74801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_marker = 1; 75801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 76801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy} 77801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 78801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy/** 79801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * clear_update_marker - clear update marker. 80801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @ubi: UBI device description object 811b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy * @vol: volume description object 82801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @bytes: new data size in bytes 83801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 841b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy * This function clears the update marker for volume @vol, sets new volume 85801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * data size and clears the "corrupted" flag (static volumes only). Returns 86801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * zero in case of success and a negative error code in case of failure. 87801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 881b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiystatic int clear_update_marker(struct ubi_device *ubi, struct ubi_volume *vol, 891b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy long long bytes) 90801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy{ 91801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy int err; 92801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy uint64_t tmp; 93801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy struct ubi_vtbl_record vtbl_rec; 94801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 951b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy dbg_msg("clear update marker for volume %d", vol->vol_id); 96801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 971b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy memcpy(&vtbl_rec, &ubi->vtbl[vol->vol_id], 981b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy sizeof(struct ubi_vtbl_record)); 99801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy ubi_assert(vol->upd_marker && vtbl_rec.upd_marker); 100801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vtbl_rec.upd_marker = 0; 101801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 102801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (vol->vol_type == UBI_STATIC_VOLUME) { 103801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->corrupted = 0; 104801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->used_bytes = tmp = bytes; 105801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->last_eb_bytes = do_div(tmp, vol->usable_leb_size); 106801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->used_ebs = tmp; 107801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (vol->last_eb_bytes) 108801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->used_ebs += 1; 109801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy else 110801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->last_eb_bytes = vol->usable_leb_size; 111801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 112801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 113cae0a77125467c42f0918e78457913ee4a2f925bArtem Bityutskiy mutex_lock(&ubi->volumes_mutex); 1141b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy err = ubi_change_vtbl_record(ubi, vol->vol_id, &vtbl_rec); 115cae0a77125467c42f0918e78457913ee4a2f925bArtem Bityutskiy mutex_unlock(&ubi->volumes_mutex); 116801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_marker = 0; 117801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 118801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy} 119801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 120801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy/** 121801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * ubi_start_update - start volume update. 122801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @ubi: UBI device description object 1231b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy * @vol: volume description object 124801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @bytes: update bytes 125801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 126801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * This function starts volume update operation. If @bytes is zero, the volume 127801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * is just wiped out. Returns zero in case of success and a negative error code 128801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * in case of failure. 129801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 1301b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiyint ubi_start_update(struct ubi_device *ubi, struct ubi_volume *vol, 1311b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy long long bytes) 132801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy{ 133801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy int i, err; 134801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy uint64_t tmp; 135801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 1361b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy dbg_msg("start update of volume %d, %llu bytes", vol->vol_id, bytes); 137e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy ubi_assert(!vol->updating && !vol->changing_leb); 138801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->updating = 1; 139801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 1401b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy err = set_update_marker(ubi, vol); 141801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err) 142801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 143801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 144801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy /* Before updating - wipe out the volume */ 145801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy for (i = 0; i < vol->reserved_pebs; i++) { 14689b96b69290668351a33b09372ec1c94cb5748e5Artem Bityutskiy err = ubi_eba_unmap_leb(ubi, vol, i); 147801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err) 148801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 149801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 150801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 151801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (bytes == 0) { 1521b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy err = clear_update_marker(ubi, vol, 0); 153801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err) 154801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 155801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = ubi_wl_flush(ubi); 156801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (!err) 157801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->updating = 0; 158801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 159801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 16092ad8f37509a7d9d5dd6e0092211b092a7ca7fb1Artem Bityutskiy vol->upd_buf = vmalloc(ubi->leb_size); 161801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (!vol->upd_buf) 162801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return -ENOMEM; 163801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 164801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy tmp = bytes; 165801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_ebs = !!do_div(tmp, vol->usable_leb_size); 166801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_ebs += tmp; 167801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_bytes = bytes; 168801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_received = 0; 169801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return 0; 170801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy} 171801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 172801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy/** 173e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * ubi_start_leb_change - start atomic LEB change. 174e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * @ubi: UBI device description object 175e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * @vol: volume description object 176e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * @req: operation request 177e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * 178e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * This function starts atomic LEB change operation. Returns zero in case of 179e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * success and a negative error code in case of failure. 180e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy */ 181e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiyint ubi_start_leb_change(struct ubi_device *ubi, struct ubi_volume *vol, 182e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy const struct ubi_leb_change_req *req) 183e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy{ 184e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy ubi_assert(!vol->updating && !vol->changing_leb); 185e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy 186e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy dbg_msg("start changing LEB %d:%d, %u bytes", 187e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy vol->vol_id, req->lnum, req->bytes); 188e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy if (req->bytes == 0) 189e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy return ubi_eba_atomic_leb_change(ubi, vol, req->lnum, NULL, 0, 190e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy req->dtype); 191e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy 192e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy vol->upd_bytes = req->bytes; 193e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy vol->upd_received = 0; 194e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy vol->changing_leb = 1; 195e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy vol->ch_lnum = req->lnum; 196e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy vol->ch_dtype = req->dtype; 197e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy 198e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy vol->upd_buf = vmalloc(req->bytes); 199e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy if (!vol->upd_buf) 200e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy return -ENOMEM; 201e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy 202e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy return 0; 203e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy} 204e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy 205e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy/** 206801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * write_leb - write update data. 207801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @ubi: UBI device description object 2081b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy * @vol: volume description object 209801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @lnum: logical eraseblock number 210801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @buf: data to write 211801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @len: data size 212801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @used_ebs: how many logical eraseblocks will this volume contain (static 213801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * volumes only) 214801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 215801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * This function writes update data to corresponding logical eraseblock. In 216801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * case of dynamic volume, this function checks if the data contains 0xFF bytes 217801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * at the end. If yes, the 0xFF bytes are cut and not written. So if the whole 218801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * buffer contains only 0xFF bytes, the LEB is left unmapped. 219801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 220801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * The reason why we skip the trailing 0xFF bytes in case of dynamic volume is 221801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * that we want to make sure that more data may be appended to the logical 222801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * eraseblock in future. Indeed, writing 0xFF bytes may have side effects and 223801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * this PEB won't be writable anymore. So if one writes the file-system image 224801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * to the UBI volume where 0xFFs mean free space - UBI makes sure this free 225801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * space is writable after the update. 226801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 227801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * We do not do this for static volumes because they are read-only. But this 228801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * also cannot be done because we have to store per-LEB CRC and the correct 229801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * data length. 230801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 231801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * This function returns zero in case of success and a negative error code in 232801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * case of failure. 233801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 2341b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiystatic int write_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum, 2351b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy void *buf, int len, int used_ebs) 236801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy{ 237e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy int err; 238801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 239801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (vol->vol_type == UBI_DYNAMIC_VOLUME) { 240e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy len = ALIGN(len, ubi->min_io_size); 241e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy memset(buf + len, 0xFF, len - len); 242801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 243e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy len = ubi_calc_data_len(ubi, buf, len); 244e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy if (len == 0) { 245801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy dbg_msg("all %d bytes contain 0xFF - skip", len); 246801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return 0; 247801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 248801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 249e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy err = ubi_eba_write_leb(ubi, vol, lnum, buf, 0, len, UBI_UNKNOWN); 250801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } else { 251801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy /* 252801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * When writing static volume, and this is the last logical 253801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * eraseblock, the length (@len) does not have to be aligned to 254801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * the minimal flash I/O unit. The 'ubi_eba_write_leb_st()' 255801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * function accepts exact (unaligned) length and stores it in 256801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * the VID header. And it takes care of proper alignment by 257801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * padding the buffer. Here we just make sure the padding will 258801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * contain zeros, not random trash. 259801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 260801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy memset(buf + len, 0, vol->usable_leb_size - len); 26189b96b69290668351a33b09372ec1c94cb5748e5Artem Bityutskiy err = ubi_eba_write_leb_st(ubi, vol, lnum, buf, len, 262801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy UBI_UNKNOWN, used_ebs); 263801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 264801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 265801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 266801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy} 267801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 268801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy/** 269801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * ubi_more_update_data - write more update data. 270801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @vol: volume description object 271801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @buf: write data (user-space memory buffer) 272801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * @count: how much bytes to write 273801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * 274801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * This function writes more data to the volume which is being updated. It may 275e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * be called arbitrary number of times until all the update data arriveis. This 276e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * function returns %0 in case of success, number of bytes written during the 277e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * last call if the whole volume update has been successfully finished, and a 278801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * negative error code in case of failure. 279801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 2801b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiyint ubi_more_update_data(struct ubi_device *ubi, struct ubi_volume *vol, 281801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy const void __user *buf, int count) 282801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy{ 283801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy uint64_t tmp; 284801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy int lnum, offs, err = 0, len, to_write = count; 285801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 286801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy dbg_msg("write %d of %lld bytes, %lld already passed", 287801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy count, vol->upd_bytes, vol->upd_received); 288801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 289801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (ubi->ro_mode) 290801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return -EROFS; 291801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 292801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy tmp = vol->upd_received; 293801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy offs = do_div(tmp, vol->usable_leb_size); 294801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy lnum = tmp; 295801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 296801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (vol->upd_received + count > vol->upd_bytes) 297801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy to_write = count = vol->upd_bytes - vol->upd_received; 298801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 299801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy /* 300801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * When updating volumes, we accumulate whole logical eraseblock of 301801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * data and write it at once. 302801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 303801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (offs != 0) { 304801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy /* 305801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * This is a write to the middle of the logical eraseblock. We 306801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * copy the data to our update buffer and wait for more data or 307801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * flush it if the whole eraseblock is written or the update 308801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * is finished. 309801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 310801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 311801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy len = vol->usable_leb_size - offs; 312801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (len > count) 313801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy len = count; 314801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 315801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = copy_from_user(vol->upd_buf + offs, buf, len); 316801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err) 317801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return -EFAULT; 318801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 319801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (offs + len == vol->usable_leb_size || 320801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_received + len == vol->upd_bytes) { 321801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy int flush_len = offs + len; 322801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 323801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy /* 324801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * OK, we gathered either the whole eraseblock or this 325801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * is the last chunk, it's time to flush the buffer. 326801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 327801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy ubi_assert(flush_len <= vol->usable_leb_size); 3281b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy err = write_leb(ubi, vol, lnum, vol->upd_buf, flush_len, 3291b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy vol->upd_ebs); 330801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err) 331801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 332801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 333801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 334801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_received += len; 335801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy count -= len; 336801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy buf += len; 337801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy lnum += 1; 338801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 339801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 340801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy /* 341801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * If we've got more to write, let's continue. At this point we know we 342801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy * are starting from the beginning of an eraseblock. 343801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy */ 344801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy while (count) { 345801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (count > vol->usable_leb_size) 346801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy len = vol->usable_leb_size; 347801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy else 348801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy len = count; 349801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 350801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = copy_from_user(vol->upd_buf, buf, len); 351801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err) 352801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return -EFAULT; 353801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 354801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (len == vol->usable_leb_size || 355801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_received + len == vol->upd_bytes) { 3561b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy err = write_leb(ubi, vol, lnum, vol->upd_buf, 3571b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy len, vol->upd_ebs); 358801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err) 359801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy break; 360801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 361801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 362801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy vol->upd_received += len; 363801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy count -= len; 364801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy lnum += 1; 365801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy buf += len; 366801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 367801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 368801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy ubi_assert(vol->upd_received <= vol->upd_bytes); 369801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (vol->upd_received == vol->upd_bytes) { 370801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy /* The update is finished, clear the update marker */ 3711b68d0eea5daddc762c54bf02154f4ad607d9ce8Artem Bityutskiy err = clear_update_marker(ubi, vol, vol->upd_bytes); 372801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err) 373801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 374801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = ubi_wl_flush(ubi); 375801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy if (err == 0) { 376e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy vol->updating = 0; 377801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy err = to_write; 37892ad8f37509a7d9d5dd6e0092211b092a7ca7fb1Artem Bityutskiy vfree(vol->upd_buf); 379801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 380801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy } 381801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy 382801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy return err; 383801c135ce73d5df1caf3eca35b66a10824ae0707Artem B. Bityutskiy} 384e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy 385e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy/** 386e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * ubi_more_leb_change_data - accept more data for atomic LEB change. 387e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * @vol: volume description object 388e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * @buf: write data (user-space memory buffer) 389e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * @count: how much bytes to write 390e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * 391e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * This function accepts more data to the volume which is being under the 392e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * "atomic LEB change" operation. It may be called arbitrary number of times 393e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * until all data arrives. This function returns %0 in case of success, number 394e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * of bytes written during the last call if the whole "atomic LEB change" 395e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * operation has been successfully finished, and a negative error code in case 396e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy * of failure. 397e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy */ 398e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiyint ubi_more_leb_change_data(struct ubi_device *ubi, struct ubi_volume *vol, 399e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy const void __user *buf, int count) 400e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy{ 401e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy int err; 402e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy 403e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy dbg_msg("write %d of %lld bytes, %lld already passed", 404e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy count, vol->upd_bytes, vol->upd_received); 405e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy 406e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy if (ubi->ro_mode) 407e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy return -EROFS; 408e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy 409e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy if (vol->upd_received + count > vol->upd_bytes) 410e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy count = vol->upd_bytes - vol->upd_received; 411e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy 412e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy err = copy_from_user(vol->upd_buf + vol->upd_received, buf, count); 413e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy if (err) 414e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy return -EFAULT; 415e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy 416e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy vol->upd_received += count; 417e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy 418e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy if (vol->upd_received == vol->upd_bytes) { 419e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy int len = ALIGN((int)vol->upd_bytes, ubi->min_io_size); 420e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy 421e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy memset(vol->upd_buf + vol->upd_bytes, 0xFF, len - vol->upd_bytes); 422e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy len = ubi_calc_data_len(ubi, vol->upd_buf, len); 423e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy err = ubi_eba_atomic_leb_change(ubi, vol, vol->ch_lnum, 424e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy vol->upd_buf, len, UBI_UNKNOWN); 425e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy if (err) 426e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy return err; 427e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy } 428e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy 429e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy ubi_assert(vol->upd_received <= vol->upd_bytes); 430e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy if (vol->upd_received == vol->upd_bytes) { 431e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy vol->changing_leb = 0; 432e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy err = count; 433e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy vfree(vol->upd_buf); 434e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy } 435e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy 436e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy return err; 437e653879c269735c9ff6684e03edf1d4e041ff3d3Artem Bityutskiy} 438