^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) * Copyright (C) 2006, 2007 University of Szeged, Hungary
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Authors: Artem Bityutskiy (Битюцкий Артём)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Adrian Hunter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Zoltan Sogor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * This file implements UBIFS I/O subsystem which provides various I/O-related
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * helper functions (reading/writing/checking/validating nodes) and implements
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * write-buffering support. Write buffers help to save space which otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * would have been wasted for padding to the nearest minimal I/O unit boundary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * Instead, data first goes to the write-buffer and is flushed when the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * buffer is full or when it is not used for some time (by timer). This is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * similar to the mechanism is used by JFFS2.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * UBIFS distinguishes between minimum write size (@c->min_io_size) and maximum
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * write size (@c->max_write_size). The latter is the maximum amount of bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * the underlying flash is able to program at a time, and writing in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * @c->max_write_size units should presumably be faster. Obviously,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * @c->min_io_size <= @c->max_write_size. Write-buffers are of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * @c->max_write_size bytes in size for maximum performance. However, when a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * write-buffer is flushed, only the portion of it (aligned to @c->min_io_size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * boundary) which contains data is written, not the whole write-buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * because this is more space-efficient.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * This optimization adds few complications to the code. Indeed, on the one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * hand, we want to write in optimal @c->max_write_size bytes chunks, which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * also means aligning writes at the @c->max_write_size bytes offsets. On the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * other hand, we do not want to waste space when synchronizing the write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * buffer, so during synchronization we writes in smaller chunks. And this makes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * the next write offset to be not aligned to @c->max_write_size bytes. So the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * have to make sure that the write-buffer offset (@wbuf->offs) becomes aligned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * to @c->max_write_size bytes again. We do this by temporarily shrinking
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * write-buffer size (@wbuf->size).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * Write-buffers are defined by 'struct ubifs_wbuf' objects and protected by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * mutexes defined inside these objects. Since sometimes upper-level code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * has to lock the write-buffer (e.g. journal space reservation code), many
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * functions related to write-buffers have "nolock" suffix which means that the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * caller has to lock the write-buffer before calling this function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * UBIFS stores nodes at 64 bit-aligned addresses. If the node length is not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * aligned, UBIFS starts the next node from the aligned address, and the padded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * bytes may contain any rubbish. In other words, UBIFS does not put padding
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * bytes in those small gaps. Common headers of nodes store real node lengths,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * not aligned lengths. Indexing nodes also store real lengths in branches.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * UBIFS uses padding when it pads to the next min. I/O unit. In this case it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * uses padding nodes or padding bytes, if the padding node does not fit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * All UBIFS nodes are protected by CRC checksums and UBIFS checks CRC when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * they are read from the flash media.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #include <linux/crc32.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) #include "ubifs.h"
^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) * ubifs_ro_mode - switch UBIFS to read read-only mode.
^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) * @err: error code which is the reason of switching to R/O mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) void ubifs_ro_mode(struct ubifs_info *c, int err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (!c->ro_error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) c->ro_error = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) c->no_chk_data_crc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) c->vfs_sb->s_flags |= SB_RDONLY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) ubifs_warn(c, "switched to read-only mode, error %d", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * Below are simple wrappers over UBI I/O functions which include some
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * additional checks and UBIFS debugging stuff. See corresponding UBI function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * for more information.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) int ubifs_leb_read(const struct ubifs_info *c, int lnum, void *buf, int offs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) int len, int even_ebadmsg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) err = ubi_read(c->ubi, lnum, buf, offs, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * In case of %-EBADMSG print the error message only if the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * @even_ebadmsg is true.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (err && (err != -EBADMSG || even_ebadmsg)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) ubifs_err(c, "reading %d bytes from LEB %d:%d failed, error %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) len, lnum, offs, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) int ubifs_leb_write(struct ubifs_info *c, int lnum, const void *buf, int offs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) ubifs_assert(c, !c->ro_media && !c->ro_mount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) if (c->ro_error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) return -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (!dbg_is_tst_rcvry(c))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) err = ubi_leb_write(c->ubi, lnum, buf, offs, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) err = dbg_leb_write(c, lnum, buf, offs, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) ubifs_err(c, "writing %d bytes to LEB %d:%d failed, error %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) len, lnum, offs, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) ubifs_ro_mode(c, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) int ubifs_leb_change(struct ubifs_info *c, int lnum, const void *buf, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) ubifs_assert(c, !c->ro_media && !c->ro_mount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (c->ro_error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (!dbg_is_tst_rcvry(c))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) err = ubi_leb_change(c->ubi, lnum, buf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) err = dbg_leb_change(c, lnum, buf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) ubifs_err(c, "changing %d bytes in LEB %d failed, error %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) len, lnum, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) ubifs_ro_mode(c, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) int ubifs_leb_unmap(struct ubifs_info *c, int lnum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) ubifs_assert(c, !c->ro_media && !c->ro_mount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (c->ro_error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) return -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (!dbg_is_tst_rcvry(c))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) err = ubi_leb_unmap(c->ubi, lnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) err = dbg_leb_unmap(c, lnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) ubifs_err(c, "unmap LEB %d failed, error %d", lnum, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) ubifs_ro_mode(c, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) int ubifs_leb_map(struct ubifs_info *c, int lnum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) ubifs_assert(c, !c->ro_media && !c->ro_mount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (c->ro_error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) return -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) if (!dbg_is_tst_rcvry(c))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) err = ubi_leb_map(c->ubi, lnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) err = dbg_leb_map(c, lnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) ubifs_err(c, "mapping LEB %d failed, error %d", lnum, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) ubifs_ro_mode(c, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) int ubifs_is_mapped(const struct ubifs_info *c, int lnum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) err = ubi_is_mapped(c->ubi, lnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) ubifs_err(c, "ubi_is_mapped failed for LEB %d, error %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) lnum, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) * ubifs_check_node - check node.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) * @buf: node to check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) * @lnum: logical eraseblock number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) * @offs: offset within the logical eraseblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) * @quiet: print no messages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) * @must_chk_crc: indicates whether to always check the CRC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) * This function checks node magic number and CRC checksum. This function also
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * validates node length to prevent UBIFS from becoming crazy when an attacker
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) * feeds it a file-system image with incorrect nodes. For example, too large
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) * node length in the common header could cause UBIFS to read memory outside of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) * allocated buffer when checking the CRC checksum.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) * This function may skip data nodes CRC checking if @c->no_chk_data_crc is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) * true, which is controlled by corresponding UBIFS mount option. However, if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) * @must_chk_crc is true, then @c->no_chk_data_crc is ignored and CRC is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) * checked. Similarly, if @c->mounting or @c->remounting_rw is true (we are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) * mounting or re-mounting to R/W mode), @c->no_chk_data_crc is ignored and CRC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) * is checked. This is because during mounting or re-mounting from R/O mode to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) * R/W mode we may read journal nodes (when replying the journal or doing the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) * recovery) and the journal nodes may potentially be corrupted, so checking is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) * required.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) * This function returns zero in case of success and %-EUCLEAN in case of bad
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) * CRC or magic.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) int ubifs_check_node(const struct ubifs_info *c, const void *buf, int lnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) int offs, int quiet, int must_chk_crc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) int err = -EINVAL, type, node_len, dump_node = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) uint32_t crc, node_crc, magic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) const struct ubifs_ch *ch = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) ubifs_assert(c, lnum >= 0 && lnum < c->leb_cnt && offs >= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) ubifs_assert(c, !(offs & 7) && offs < c->leb_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) magic = le32_to_cpu(ch->magic);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (magic != UBIFS_NODE_MAGIC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if (!quiet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) ubifs_err(c, "bad magic %#08x, expected %#08x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) magic, UBIFS_NODE_MAGIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) err = -EUCLEAN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) type = ch->node_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (type < 0 || type >= UBIFS_NODE_TYPES_CNT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) if (!quiet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) ubifs_err(c, "bad node type %d", type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) node_len = le32_to_cpu(ch->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (node_len + offs > c->leb_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) goto out_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (c->ranges[type].max_len == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) if (node_len != c->ranges[type].len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) goto out_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) } else if (node_len < c->ranges[type].min_len ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) node_len > c->ranges[type].max_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) goto out_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) if (!must_chk_crc && type == UBIFS_DATA_NODE && !c->mounting &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) !c->remounting_rw && c->no_chk_data_crc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) crc = crc32(UBIFS_CRC32_INIT, buf + 8, node_len - 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) node_crc = le32_to_cpu(ch->crc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) if (crc != node_crc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) if (!quiet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) ubifs_err(c, "bad CRC: calculated %#08x, read %#08x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) crc, node_crc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) err = -EUCLEAN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) out_len:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) if (!quiet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) ubifs_err(c, "bad node length %d", node_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) if (type == UBIFS_DATA_NODE && node_len > UBIFS_DATA_NODE_SZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) dump_node = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) if (!quiet) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) ubifs_err(c, "bad node at LEB %d:%d", lnum, offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) if (dump_node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) ubifs_dump_node(c, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) int safe_len = min3(node_len, c->leb_size - offs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) (int)UBIFS_MAX_DATA_NODE_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) pr_err("\tprevent out-of-bounds memory access\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) pr_err("\ttruncated data node length %d\n", safe_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) pr_err("\tcorrupted data node:\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) print_hex_dump(KERN_ERR, "\t", DUMP_PREFIX_OFFSET, 32, 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) buf, safe_len, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) * ubifs_pad - pad flash space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) * @buf: buffer to put padding to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) * @pad: how many bytes to pad
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) * The flash media obliges us to write only in chunks of %c->min_io_size and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) * when we have to write less data we add padding node to the write-buffer and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) * pad it to the next minimal I/O unit's boundary. Padding nodes help when the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) * media is being scanned. If the amount of wasted space is not enough to fit a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) * padding node which takes %UBIFS_PAD_NODE_SZ bytes, we write padding bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) * pattern (%UBIFS_PADDING_BYTE).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) * Padding nodes are also used to fill gaps when the "commit-in-gaps" method is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) * used.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) void ubifs_pad(const struct ubifs_info *c, void *buf, int pad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) uint32_t crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) ubifs_assert(c, pad >= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) if (pad >= UBIFS_PAD_NODE_SZ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) struct ubifs_ch *ch = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) struct ubifs_pad_node *pad_node = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) ch->magic = cpu_to_le32(UBIFS_NODE_MAGIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) ch->node_type = UBIFS_PAD_NODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) ch->group_type = UBIFS_NO_NODE_GROUP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) ch->padding[0] = ch->padding[1] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) ch->sqnum = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) ch->len = cpu_to_le32(UBIFS_PAD_NODE_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) pad -= UBIFS_PAD_NODE_SZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) pad_node->pad_len = cpu_to_le32(pad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) crc = crc32(UBIFS_CRC32_INIT, buf + 8, UBIFS_PAD_NODE_SZ - 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) ch->crc = cpu_to_le32(crc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) memset(buf + UBIFS_PAD_NODE_SZ, 0, pad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) } else if (pad > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) /* Too little space, padding node won't fit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) memset(buf, UBIFS_PADDING_BYTE, pad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) * next_sqnum - get next sequence number.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) static unsigned long long next_sqnum(struct ubifs_info *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) unsigned long long sqnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) spin_lock(&c->cnt_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) sqnum = ++c->max_sqnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) spin_unlock(&c->cnt_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) if (unlikely(sqnum >= SQNUM_WARN_WATERMARK)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) if (sqnum >= SQNUM_WATERMARK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) ubifs_err(c, "sequence number overflow %llu, end of life",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) sqnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) ubifs_ro_mode(c, -EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) ubifs_warn(c, "running out of sequence numbers, end of life soon");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) return sqnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) void ubifs_init_node(struct ubifs_info *c, void *node, int len, int pad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) struct ubifs_ch *ch = node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) unsigned long long sqnum = next_sqnum(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) ubifs_assert(c, len >= UBIFS_CH_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) ch->magic = cpu_to_le32(UBIFS_NODE_MAGIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) ch->len = cpu_to_le32(len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) ch->group_type = UBIFS_NO_NODE_GROUP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) ch->sqnum = cpu_to_le64(sqnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) ch->padding[0] = ch->padding[1] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) if (pad) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) len = ALIGN(len, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) pad = ALIGN(len, c->min_io_size) - len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) ubifs_pad(c, node + len, pad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) void ubifs_crc_node(struct ubifs_info *c, void *node, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) struct ubifs_ch *ch = node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) uint32_t crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) crc = crc32(UBIFS_CRC32_INIT, node + 8, len - 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) ch->crc = cpu_to_le32(crc);
^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) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) * ubifs_prepare_node_hmac - prepare node to be written to flash.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) * @node: the node to pad
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) * @len: node length
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) * @hmac_offs: offset of the HMAC in the node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) * @pad: if the buffer has to be padded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) * This function prepares node at @node to be written to the media - it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) * calculates node CRC, fills the common header, and adds proper padding up to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) * the next minimum I/O unit if @pad is not zero. if @hmac_offs is positive then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) * a HMAC is inserted into the node at the given offset.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) * This function returns 0 for success or a negative error code otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) int ubifs_prepare_node_hmac(struct ubifs_info *c, void *node, int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) int hmac_offs, int pad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) ubifs_init_node(c, node, len, pad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) if (hmac_offs > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) err = ubifs_node_insert_hmac(c, node, len, hmac_offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) return err;
^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) ubifs_crc_node(c, node, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) }
^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) * ubifs_prepare_node - prepare node to be written to flash.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) * @node: the node to pad
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) * @len: node length
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) * @pad: if the buffer has to be padded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) * This function prepares node at @node to be written to the media - it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) * calculates node CRC, fills the common header, and adds proper padding up to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) * the next minimum I/O unit if @pad is not zero.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) void ubifs_prepare_node(struct ubifs_info *c, void *node, int len, int pad)
^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) * Deliberately ignore return value since this function can only fail
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) * when a hmac offset is given.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) ubifs_prepare_node_hmac(c, node, len, 0, pad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) }
^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) * ubifs_prep_grp_node - prepare node of a group to be written to flash.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) * @node: the node to pad
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) * @len: node length
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) * @last: indicates the last node of the group
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) * This function prepares node at @node to be written to the media - it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) * calculates node CRC and fills the common header.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) void ubifs_prep_grp_node(struct ubifs_info *c, void *node, int len, int last)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) uint32_t crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) struct ubifs_ch *ch = node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) unsigned long long sqnum = next_sqnum(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) ubifs_assert(c, len >= UBIFS_CH_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) ch->magic = cpu_to_le32(UBIFS_NODE_MAGIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) ch->len = cpu_to_le32(len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) if (last)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) ch->group_type = UBIFS_LAST_OF_NODE_GROUP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) ch->group_type = UBIFS_IN_NODE_GROUP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) ch->sqnum = cpu_to_le64(sqnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) ch->padding[0] = ch->padding[1] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) crc = crc32(UBIFS_CRC32_INIT, node + 8, len - 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) ch->crc = cpu_to_le32(crc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) }
^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) * wbuf_timer_callback - write-buffer timer callback function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) * @timer: timer data (write-buffer descriptor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) * This function is called when the write-buffer timer expires.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) static enum hrtimer_restart wbuf_timer_callback_nolock(struct hrtimer *timer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) struct ubifs_wbuf *wbuf = container_of(timer, struct ubifs_wbuf, timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) dbg_io("jhead %s", dbg_jhead(wbuf->jhead));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) wbuf->need_sync = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) wbuf->c->need_wbuf_sync = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) ubifs_wake_up_bgt(wbuf->c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) return HRTIMER_NORESTART;
^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) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) * new_wbuf_timer - start new write-buffer timer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) * @wbuf: write-buffer descriptor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) static void new_wbuf_timer_nolock(struct ubifs_info *c, struct ubifs_wbuf *wbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) ktime_t softlimit = ms_to_ktime(dirty_writeback_interval * 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) unsigned long long delta = dirty_writeback_interval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) /* centi to milli, milli to nano, then 10% */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) delta *= 10ULL * NSEC_PER_MSEC / 10ULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) ubifs_assert(c, !hrtimer_active(&wbuf->timer));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) ubifs_assert(c, delta <= ULONG_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) if (wbuf->no_timer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) dbg_io("set timer for jhead %s, %llu-%llu millisecs",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) dbg_jhead(wbuf->jhead),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) div_u64(ktime_to_ns(softlimit), USEC_PER_SEC),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) div_u64(ktime_to_ns(softlimit) + delta, USEC_PER_SEC));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) hrtimer_start_range_ns(&wbuf->timer, softlimit, delta,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) HRTIMER_MODE_REL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) * cancel_wbuf_timer - cancel write-buffer timer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) * @wbuf: write-buffer descriptor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) static void cancel_wbuf_timer_nolock(struct ubifs_wbuf *wbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) if (wbuf->no_timer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) wbuf->need_sync = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) hrtimer_cancel(&wbuf->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) * ubifs_wbuf_sync_nolock - synchronize write-buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) * @wbuf: write-buffer to synchronize
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) * This function synchronizes write-buffer @buf and returns zero in case of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) * success or a negative error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) * Note, although write-buffers are of @c->max_write_size, this function does
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) * not necessarily writes all @c->max_write_size bytes to the flash. Instead,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) * if the write-buffer is only partially filled with data, only the used part
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) * of the write-buffer (aligned on @c->min_io_size boundary) is synchronized.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) * This way we waste less space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) int ubifs_wbuf_sync_nolock(struct ubifs_wbuf *wbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) struct ubifs_info *c = wbuf->c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) int err, dirt, sync_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) cancel_wbuf_timer_nolock(wbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) if (!wbuf->used || wbuf->lnum == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) /* Write-buffer is empty or not seeked */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) dbg_io("LEB %d:%d, %d bytes, jhead %s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) wbuf->lnum, wbuf->offs, wbuf->used, dbg_jhead(wbuf->jhead));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) ubifs_assert(c, !(wbuf->avail & 7));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) ubifs_assert(c, wbuf->offs + wbuf->size <= c->leb_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) ubifs_assert(c, wbuf->size >= c->min_io_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) ubifs_assert(c, wbuf->size <= c->max_write_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) ubifs_assert(c, wbuf->size % c->min_io_size == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) ubifs_assert(c, !c->ro_media && !c->ro_mount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) if (c->leb_size - wbuf->offs >= c->max_write_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) ubifs_assert(c, !((wbuf->offs + wbuf->size) % c->max_write_size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) if (c->ro_error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) return -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) * Do not write whole write buffer but write only the minimum necessary
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) * amount of min. I/O units.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) sync_len = ALIGN(wbuf->used, c->min_io_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) dirt = sync_len - wbuf->used;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) if (dirt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) ubifs_pad(c, wbuf->buf + wbuf->used, dirt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) err = ubifs_leb_write(c, wbuf->lnum, wbuf->buf, wbuf->offs, sync_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) spin_lock(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) wbuf->offs += sync_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) * Now @wbuf->offs is not necessarily aligned to @c->max_write_size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) * But our goal is to optimize writes and make sure we write in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) * @c->max_write_size chunks and to @c->max_write_size-aligned offset.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) * Thus, if @wbuf->offs is not aligned to @c->max_write_size now, make
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) * sure that @wbuf->offs + @wbuf->size is aligned to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) * @c->max_write_size. This way we make sure that after next
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) * write-buffer flush we are again at the optimal offset (aligned to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) * @c->max_write_size).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) if (c->leb_size - wbuf->offs < c->max_write_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) wbuf->size = c->leb_size - wbuf->offs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) else if (wbuf->offs & (c->max_write_size - 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) wbuf->size = ALIGN(wbuf->offs, c->max_write_size) - wbuf->offs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) wbuf->size = c->max_write_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) wbuf->avail = wbuf->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) wbuf->used = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) wbuf->next_ino = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) spin_unlock(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) if (wbuf->sync_callback)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) err = wbuf->sync_callback(c, wbuf->lnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) c->leb_size - wbuf->offs, dirt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) * ubifs_wbuf_seek_nolock - seek write-buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) * @wbuf: write-buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) * @lnum: logical eraseblock number to seek to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) * @offs: logical eraseblock offset to seek to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) * This function targets the write-buffer to logical eraseblock @lnum:@offs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) * The write-buffer has to be empty. Returns zero in case of success and a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) * negative error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) int ubifs_wbuf_seek_nolock(struct ubifs_wbuf *wbuf, int lnum, int offs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) const struct ubifs_info *c = wbuf->c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) dbg_io("LEB %d:%d, jhead %s", lnum, offs, dbg_jhead(wbuf->jhead));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) ubifs_assert(c, lnum >= 0 && lnum < c->leb_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) ubifs_assert(c, offs >= 0 && offs <= c->leb_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) ubifs_assert(c, offs % c->min_io_size == 0 && !(offs & 7));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) ubifs_assert(c, lnum != wbuf->lnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) ubifs_assert(c, wbuf->used == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) spin_lock(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) wbuf->lnum = lnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) wbuf->offs = offs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) if (c->leb_size - wbuf->offs < c->max_write_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) wbuf->size = c->leb_size - wbuf->offs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) else if (wbuf->offs & (c->max_write_size - 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) wbuf->size = ALIGN(wbuf->offs, c->max_write_size) - wbuf->offs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) wbuf->size = c->max_write_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) wbuf->avail = wbuf->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) wbuf->used = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) spin_unlock(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) * ubifs_bg_wbufs_sync - synchronize write-buffers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) * This function is called by background thread to synchronize write-buffers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) * Returns zero in case of success and a negative error code in case of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) * failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) int ubifs_bg_wbufs_sync(struct ubifs_info *c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) int err, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) ubifs_assert(c, !c->ro_media && !c->ro_mount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) if (!c->need_wbuf_sync)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) c->need_wbuf_sync = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) if (c->ro_error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) err = -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) goto out_timers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) dbg_io("synchronize");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) for (i = 0; i < c->jhead_cnt; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) struct ubifs_wbuf *wbuf = &c->jheads[i].wbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) * If the mutex is locked then wbuf is being changed, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) * synchronization is not necessary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) if (mutex_is_locked(&wbuf->io_mutex))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) if (!wbuf->need_sync) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) mutex_unlock(&wbuf->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) err = ubifs_wbuf_sync_nolock(wbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) mutex_unlock(&wbuf->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) ubifs_err(c, "cannot sync write-buffer, error %d", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) ubifs_ro_mode(c, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) goto out_timers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) }
^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) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) out_timers:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) /* Cancel all timers to prevent repeated errors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) for (i = 0; i < c->jhead_cnt; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) struct ubifs_wbuf *wbuf = &c->jheads[i].wbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) cancel_wbuf_timer_nolock(wbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) mutex_unlock(&wbuf->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) * ubifs_wbuf_write_nolock - write data to flash via write-buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) * @wbuf: write-buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) * @buf: node to write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) * @len: node length
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) * This function writes data to flash via write-buffer @wbuf. This means that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) * the last piece of the node won't reach the flash media immediately if it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) * does not take whole max. write unit (@c->max_write_size). Instead, the node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) * will sit in RAM until the write-buffer is synchronized (e.g., by timer, or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) * because more data are appended to the write-buffer).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) * This function returns zero in case of success and a negative error code in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) * case of failure. If the node cannot be written because there is no more
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) * space in this logical eraseblock, %-ENOSPC is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) struct ubifs_info *c = wbuf->c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) int err, written, n, aligned_len = ALIGN(len, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) dbg_io("%d bytes (%s) to jhead %s wbuf at LEB %d:%d", len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) dbg_ntype(((struct ubifs_ch *)buf)->node_type),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) dbg_jhead(wbuf->jhead), wbuf->lnum, wbuf->offs + wbuf->used);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) ubifs_assert(c, len > 0 && wbuf->lnum >= 0 && wbuf->lnum < c->leb_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) ubifs_assert(c, wbuf->offs >= 0 && wbuf->offs % c->min_io_size == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) ubifs_assert(c, !(wbuf->offs & 7) && wbuf->offs <= c->leb_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) ubifs_assert(c, wbuf->avail > 0 && wbuf->avail <= wbuf->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) ubifs_assert(c, wbuf->size >= c->min_io_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) ubifs_assert(c, wbuf->size <= c->max_write_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) ubifs_assert(c, wbuf->size % c->min_io_size == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) ubifs_assert(c, mutex_is_locked(&wbuf->io_mutex));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) ubifs_assert(c, !c->ro_media && !c->ro_mount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) ubifs_assert(c, !c->space_fixup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) if (c->leb_size - wbuf->offs >= c->max_write_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) ubifs_assert(c, !((wbuf->offs + wbuf->size) % c->max_write_size));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) if (c->leb_size - wbuf->offs - wbuf->used < aligned_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) err = -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) cancel_wbuf_timer_nolock(wbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) if (c->ro_error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) return -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) if (aligned_len <= wbuf->avail) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) * The node is not very large and fits entirely within
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) * write-buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) memcpy(wbuf->buf + wbuf->used, buf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) if (aligned_len > len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) ubifs_assert(c, aligned_len - len < 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) ubifs_pad(c, wbuf->buf + wbuf->used + len, aligned_len - len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) if (aligned_len == wbuf->avail) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) dbg_io("flush jhead %s wbuf to LEB %d:%d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) dbg_jhead(wbuf->jhead), wbuf->lnum, wbuf->offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) err = ubifs_leb_write(c, wbuf->lnum, wbuf->buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) wbuf->offs, wbuf->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) spin_lock(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) wbuf->offs += wbuf->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) if (c->leb_size - wbuf->offs >= c->max_write_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) wbuf->size = c->max_write_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) wbuf->size = c->leb_size - wbuf->offs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) wbuf->avail = wbuf->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) wbuf->used = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) wbuf->next_ino = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) spin_unlock(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) spin_lock(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) wbuf->avail -= aligned_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) wbuf->used += aligned_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) spin_unlock(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) written = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) if (wbuf->used) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) * The node is large enough and does not fit entirely within
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) * current available space. We have to fill and flush
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) * write-buffer and switch to the next max. write unit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) dbg_io("flush jhead %s wbuf to LEB %d:%d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) dbg_jhead(wbuf->jhead), wbuf->lnum, wbuf->offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) memcpy(wbuf->buf + wbuf->used, buf, wbuf->avail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) err = ubifs_leb_write(c, wbuf->lnum, wbuf->buf, wbuf->offs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) wbuf->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) wbuf->offs += wbuf->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) len -= wbuf->avail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) aligned_len -= wbuf->avail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) written += wbuf->avail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) } else if (wbuf->offs & (c->max_write_size - 1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) * The write-buffer offset is not aligned to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) * @c->max_write_size and @wbuf->size is less than
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) * @c->max_write_size. Write @wbuf->size bytes to make sure the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) * following writes are done in optimal @c->max_write_size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) * chunks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) dbg_io("write %d bytes to LEB %d:%d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) wbuf->size, wbuf->lnum, wbuf->offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) err = ubifs_leb_write(c, wbuf->lnum, buf, wbuf->offs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) wbuf->size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) wbuf->offs += wbuf->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) len -= wbuf->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) aligned_len -= wbuf->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) written += wbuf->size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) * The remaining data may take more whole max. write units, so write the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) * remains multiple to max. write unit size directly to the flash media.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) * We align node length to 8-byte boundary because we anyway flash wbuf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) * if the remaining space is less than 8 bytes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) n = aligned_len >> c->max_write_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) if (n) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) int m = n - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) dbg_io("write %d bytes to LEB %d:%d", n, wbuf->lnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) wbuf->offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) if (m) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) /* '(n-1)<<c->max_write_shift < len' is always true. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) m <<= c->max_write_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) err = ubifs_leb_write(c, wbuf->lnum, buf + written,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) wbuf->offs, m);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) wbuf->offs += m;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) aligned_len -= m;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) len -= m;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) written += m;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) * The non-written len of buf may be less than 'n' because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) * parameter 'len' is not 8 bytes aligned, so here we read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) * min(len, n) bytes from buf.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) n = 1 << c->max_write_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) memcpy(wbuf->buf, buf + written, min(len, n));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) if (n > len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) ubifs_assert(c, n - len < 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) ubifs_pad(c, wbuf->buf + len, n - len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) err = ubifs_leb_write(c, wbuf->lnum, wbuf->buf, wbuf->offs, n);
^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) wbuf->offs += n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) aligned_len -= n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) len -= min(len, n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) written += n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) spin_lock(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) if (aligned_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) * And now we have what's left and what does not take whole
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) * max. write unit, so write it to the write-buffer and we are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) * done.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) memcpy(wbuf->buf, buf + written, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) if (aligned_len > len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) ubifs_assert(c, aligned_len - len < 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) ubifs_pad(c, wbuf->buf + len, aligned_len - len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) if (c->leb_size - wbuf->offs >= c->max_write_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) wbuf->size = c->max_write_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) wbuf->size = c->leb_size - wbuf->offs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) wbuf->avail = wbuf->size - aligned_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) wbuf->used = aligned_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) wbuf->next_ino = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) spin_unlock(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) if (wbuf->sync_callback) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) int free = c->leb_size - wbuf->offs - wbuf->used;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) err = wbuf->sync_callback(c, wbuf->lnum, free, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) if (wbuf->used)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) new_wbuf_timer_nolock(c, wbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) ubifs_err(c, "cannot write %d bytes to LEB %d:%d, error %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) len, wbuf->lnum, wbuf->offs, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) ubifs_dump_node(c, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) ubifs_dump_leb(c, wbuf->lnum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) * ubifs_write_node_hmac - write node to the media.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) * @buf: the node to write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) * @len: node length
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) * @lnum: logical eraseblock number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) * @offs: offset within the logical eraseblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) * @hmac_offs: offset of the HMAC within the node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) * This function automatically fills node magic number, assigns sequence
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) * number, and calculates node CRC checksum. The length of the @buf buffer has
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) * to be aligned to the minimal I/O unit size. This function automatically
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) * appends padding node and padding bytes if needed. Returns zero in case of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) * success and a negative error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) int ubifs_write_node_hmac(struct ubifs_info *c, void *buf, int len, int lnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) int offs, int hmac_offs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) int err, buf_len = ALIGN(len, c->min_io_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) dbg_io("LEB %d:%d, %s, length %d (aligned %d)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) lnum, offs, dbg_ntype(((struct ubifs_ch *)buf)->node_type), len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) buf_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) ubifs_assert(c, lnum >= 0 && lnum < c->leb_cnt && offs >= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) ubifs_assert(c, offs % c->min_io_size == 0 && offs < c->leb_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) ubifs_assert(c, !c->ro_media && !c->ro_mount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) ubifs_assert(c, !c->space_fixup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) if (c->ro_error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) return -EROFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) err = ubifs_prepare_node_hmac(c, buf, len, hmac_offs, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) err = ubifs_leb_write(c, lnum, buf, offs, buf_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) ubifs_dump_node(c, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) * ubifs_write_node - write node to the media.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) * @buf: the node to write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) * @len: node length
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) * @lnum: logical eraseblock number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) * @offs: offset within the logical eraseblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) * This function automatically fills node magic number, assigns sequence
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) * number, and calculates node CRC checksum. The length of the @buf buffer has
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) * to be aligned to the minimal I/O unit size. This function automatically
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) * appends padding node and padding bytes if needed. Returns zero in case of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) * success and a negative error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) int ubifs_write_node(struct ubifs_info *c, void *buf, int len, int lnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) int offs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) return ubifs_write_node_hmac(c, buf, len, lnum, offs, -1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) * ubifs_read_node_wbuf - read node from the media or write-buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) * @wbuf: wbuf to check for un-written data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) * @buf: buffer to read to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) * @type: node type
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) * @len: node length
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) * @lnum: logical eraseblock number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) * @offs: offset within the logical eraseblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) * This function reads a node of known type and length, checks it and stores
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) * in @buf. If the node partially or fully sits in the write-buffer, this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) * function takes data from the buffer, otherwise it reads the flash media.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) * Returns zero in case of success, %-EUCLEAN if CRC mismatched and a negative
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) * error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) int ubifs_read_node_wbuf(struct ubifs_wbuf *wbuf, void *buf, int type, int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) int lnum, int offs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) const struct ubifs_info *c = wbuf->c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) int err, rlen, overlap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) struct ubifs_ch *ch = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) dbg_io("LEB %d:%d, %s, length %d, jhead %s", lnum, offs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) dbg_ntype(type), len, dbg_jhead(wbuf->jhead));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) ubifs_assert(c, wbuf && lnum >= 0 && lnum < c->leb_cnt && offs >= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) ubifs_assert(c, !(offs & 7) && offs < c->leb_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) ubifs_assert(c, type >= 0 && type < UBIFS_NODE_TYPES_CNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) spin_lock(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) overlap = (lnum == wbuf->lnum && offs + len > wbuf->offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) if (!overlap) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) /* We may safely unlock the write-buffer and read the data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) spin_unlock(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) return ubifs_read_node(c, buf, type, len, lnum, offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) /* Don't read under wbuf */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) rlen = wbuf->offs - offs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) if (rlen < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) rlen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) /* Copy the rest from the write-buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) memcpy(buf + rlen, wbuf->buf + offs + rlen - wbuf->offs, len - rlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) spin_unlock(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) if (rlen > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) /* Read everything that goes before write-buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) err = ubifs_leb_read(c, lnum, buf, offs, rlen, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) if (err && err != -EBADMSG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) if (type != ch->node_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) ubifs_err(c, "bad node type (%d but expected %d)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) ch->node_type, type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) err = ubifs_check_node(c, buf, lnum, offs, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) ubifs_err(c, "expected node type %d", type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) rlen = le32_to_cpu(ch->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) if (rlen != len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) ubifs_err(c, "bad node length %d, expected %d", rlen, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) ubifs_err(c, "bad node at LEB %d:%d", lnum, offs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) ubifs_dump_node(c, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) * ubifs_read_node - read node.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) * @buf: buffer to read to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) * @type: node type
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) * @len: node length (not aligned)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) * @lnum: logical eraseblock number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) * @offs: offset within the logical eraseblock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) * This function reads a node of known type and and length, checks it and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) * stores in @buf. Returns zero in case of success, %-EUCLEAN if CRC mismatched
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) * and a negative error code in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) int ubifs_read_node(const struct ubifs_info *c, void *buf, int type, int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) int lnum, int offs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) int err, l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) struct ubifs_ch *ch = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) dbg_io("LEB %d:%d, %s, length %d", lnum, offs, dbg_ntype(type), len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) ubifs_assert(c, lnum >= 0 && lnum < c->leb_cnt && offs >= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) ubifs_assert(c, len >= UBIFS_CH_SZ && offs + len <= c->leb_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) ubifs_assert(c, !(offs & 7) && offs < c->leb_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) ubifs_assert(c, type >= 0 && type < UBIFS_NODE_TYPES_CNT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) err = ubifs_leb_read(c, lnum, buf, offs, len, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) if (err && err != -EBADMSG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) if (type != ch->node_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) ubifs_errc(c, "bad node type (%d but expected %d)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) ch->node_type, type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) err = ubifs_check_node(c, buf, lnum, offs, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) ubifs_errc(c, "expected node type %d", type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) l = le32_to_cpu(ch->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) if (l != len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) ubifs_errc(c, "bad node length %d, expected %d", l, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) ubifs_errc(c, "bad node at LEB %d:%d, LEB mapping status %d", lnum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) offs, ubi_is_mapped(c->ubi, lnum));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) if (!c->probing) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) ubifs_dump_node(c, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) dump_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) * ubifs_wbuf_init - initialize write-buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) * @wbuf: write-buffer to initialize
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) * This function initializes write-buffer. Returns zero in case of success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) * %-ENOMEM in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) size_t size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) wbuf->buf = kmalloc(c->max_write_size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) if (!wbuf->buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) size = (c->max_write_size / UBIFS_CH_SZ + 1) * sizeof(ino_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) wbuf->inodes = kmalloc(size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) if (!wbuf->inodes) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) kfree(wbuf->buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) wbuf->buf = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) wbuf->used = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) wbuf->lnum = wbuf->offs = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) * If the LEB starts at the max. write size aligned address, then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) * write-buffer size has to be set to @c->max_write_size. Otherwise,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) * set it to something smaller so that it ends at the closest max.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) * write size boundary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) size = c->max_write_size - (c->leb_start % c->max_write_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) wbuf->avail = wbuf->size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) wbuf->sync_callback = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) mutex_init(&wbuf->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) spin_lock_init(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) wbuf->c = c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) wbuf->next_ino = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) hrtimer_init(&wbuf->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) wbuf->timer.function = wbuf_timer_callback_nolock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) * ubifs_wbuf_add_ino_nolock - add an inode number into the wbuf inode array.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) * @wbuf: the write-buffer where to add
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) * @inum: the inode number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) * This function adds an inode number to the inode array of the write-buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) void ubifs_wbuf_add_ino_nolock(struct ubifs_wbuf *wbuf, ino_t inum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) if (!wbuf->buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) /* NOR flash or something similar */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) spin_lock(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) if (wbuf->used)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) wbuf->inodes[wbuf->next_ino++] = inum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) spin_unlock(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) * wbuf_has_ino - returns if the wbuf contains data from the inode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) * @wbuf: the write-buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) * @inum: the inode number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) * This function returns with %1 if the write-buffer contains some data from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) * given inode otherwise it returns with %0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) static int wbuf_has_ino(struct ubifs_wbuf *wbuf, ino_t inum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) int i, ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) spin_lock(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) for (i = 0; i < wbuf->next_ino; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) if (inum == wbuf->inodes[i]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) spin_unlock(&wbuf->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) * ubifs_sync_wbufs_by_inode - synchronize write-buffers for an inode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) * @inode: inode to synchronize
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) * This function synchronizes write-buffers which contain nodes belonging to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) * @inode. Returns zero in case of success and a negative error code in case of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) * failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) int ubifs_sync_wbufs_by_inode(struct ubifs_info *c, struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) int i, err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) for (i = 0; i < c->jhead_cnt; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) struct ubifs_wbuf *wbuf = &c->jheads[i].wbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) if (i == GCHD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) * GC head is special, do not look at it. Even if the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) * head contains something related to this inode, it is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241) * a _copy_ of corresponding on-flash node which sits
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) * somewhere else.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) if (!wbuf_has_ino(wbuf, inode->i_ino))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) if (wbuf_has_ino(wbuf, inode->i_ino))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) err = ubifs_wbuf_sync_nolock(wbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) mutex_unlock(&wbuf->io_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) ubifs_ro_mode(c, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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