X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=e2fsck%2Fsuper.c;h=123813be718394b17b3579f3879ddaa23bfbff25;hb=16d5334075dc9869da94a751495bcfc21300e070;hp=9210739ac0be43e1a72dd0db145d90c26c36df8a;hpb=2a77a784a327835dbf0c8aa92978f201e44fbc26;p=tools%2Fe2fsprogs.git diff --git a/e2fsck/super.c b/e2fsck/super.c index 9210739..123813b 100644 --- a/e2fsck/super.c +++ b/e2fsck/super.c @@ -1,6 +1,6 @@ /* * e2fsck.c - superblock checks - * + * * Copyright (C) 1993, 1994, 1995, 1996, 1997 Theodore Ts'o. * * %Begin-Header% @@ -9,6 +9,7 @@ * %End-Header% */ +#include "config.h" #ifdef HAVE_ERRNO_H #include #endif @@ -21,35 +22,45 @@ #define MIN_CHECK 1 #define MAX_CHECK 2 +#define LOG2_CHECK 4 -static void check_super_value(e2fsck_t ctx, const char *descr, +static int check_super_value(e2fsck_t ctx, const char *descr, unsigned long value, int flags, unsigned long min_val, unsigned long max_val) { struct problem_context pctx; - if (((flags & MIN_CHECK) && (value < min_val)) || - ((flags & MAX_CHECK) && (value > max_val))) { + if ((flags & MIN_CHECK && value < min_val) || + (flags & MAX_CHECK && value > max_val) || + (flags & LOG2_CHECK && (value & (value - 1)) != 0)) { clear_problem_context(&pctx); pctx.num = value; pctx.str = descr; fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx); - ctx->flags |= E2F_FLAG_ABORT; /* never get here! */ + ctx->flags |= E2F_FLAG_ABORT; + return 0; } + return 1; } -/* - * This routine may get stubbed out in special compilations of the - * e2fsck code.. - */ -#ifndef EXT2_SPECIAL_DEVICE_SIZE -errcode_t e2fsck_get_device_size(e2fsck_t ctx) +static int check_super_value64(e2fsck_t ctx, const char *descr, + __u64 value, int flags, + __u64 min_val, __u64 max_val) { - return (ext2fs_get_device_size(ctx->filesystem_name, - EXT2_BLOCK_SIZE(ctx->fs->super), - &ctx->num_blocks)); + struct problem_context pctx; + + if ((flags & MIN_CHECK && value < min_val) || + (flags & MAX_CHECK && value > max_val) || + (flags & LOG2_CHECK && (value & (value - 1)) != 0)) { + clear_problem_context(&pctx); + pctx.num = value; + pctx.str = descr; + fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx); + ctx->flags |= E2F_FLAG_ABORT; + return 0; + } + return 1; } -#endif /* * helper function to release an inode @@ -60,21 +71,26 @@ struct process_block_struct { struct problem_context *pctx; int truncating; int truncate_offset; - blk_t truncate_block; + e2_blkcnt_t truncate_block; int truncated_blocks; int abort; errcode_t errcode; + blk64_t last_cluster; + struct ext2_inode_large *inode; }; static int release_inode_block(ext2_filsys fs, - blk_t *block_nr, - int blockcnt, + blk64_t *block_nr, + e2_blkcnt_t blockcnt, + blk64_t ref_blk EXT2FS_ATTR((unused)), + int ref_offset EXT2FS_ATTR((unused)), void *priv_data) { struct process_block_struct *pb; e2fsck_t ctx; struct problem_context *pctx; - blk_t blk = *block_nr; + blk64_t blk = *block_nr; + blk64_t cluster = EXT2FS_B2C(fs, *block_nr); int retval = 0; pb = (struct process_block_struct *) priv_data; @@ -84,18 +100,23 @@ static int release_inode_block(ext2_filsys fs, pctx->blk = blk; pctx->blkcount = blockcnt; - if (HOLE_BLKADDR(blk)) + if (blk == 0) + return 0; + + if (pb->last_cluster == cluster) return 0; + pb->last_cluster = cluster; + if ((blk < fs->super->s_first_data_block) || - (blk >= fs->super->s_blocks_count)) { + (blk >= ext2fs_blocks_count(fs->super))) { fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_BLOCK_NUM, pctx); return_abort: pb->abort = 1; return BLOCK_ABORT; } - if (!ext2fs_test_block_bitmap(fs->block_map, blk)) { + if (!ext2fs_test_block_bitmap2(fs->block_map, blk)) { fix_problem(ctx, PR_0_ORPHAN_ALREADY_CLEARED_BLOCK, pctx); goto return_abort; } @@ -113,8 +134,8 @@ static int release_inode_block(ext2_filsys fs, if (blockcnt < 0) { int i, limit; blk_t *bp; - - pb->errcode = io_channel_read_blk(fs->io, blk, 1, + + pb->errcode = io_channel_read_blk64(fs->io, blk, 1, pb->buf); if (pb->errcode) goto return_abort; @@ -136,13 +157,13 @@ static int release_inode_block(ext2_filsys fs, * it here. */ if ((blockcnt == pb->truncate_block) && pb->truncate_offset) { - pb->errcode = io_channel_read_blk(fs->io, blk, 1, + pb->errcode = io_channel_read_blk64(fs->io, blk, 1, pb->buf); if (pb->errcode) goto return_abort; memset(pb->buf + pb->truncate_offset, 0, fs->blocksize - pb->truncate_offset); - pb->errcode = io_channel_write_blk(fs->io, blk, 1, + pb->errcode = io_channel_write_blk64(fs->io, blk, 1, pb->buf); if (pb->errcode) goto return_abort; @@ -151,26 +172,30 @@ static int release_inode_block(ext2_filsys fs, *block_nr = 0; retval |= BLOCK_CHANGED; } - - ext2fs_block_alloc_stats(fs, blk, -1); + + if (ctx->qctx) + quota_data_sub(ctx->qctx, pb->inode, 0, ctx->fs->blocksize); + ext2fs_block_alloc_stats2(fs, blk, -1); + ctx->free_blocks++; return retval; } - + /* * This function releases an inode. Returns 1 if an inconsistency was * found. If the inode has a link count, then it is being truncated and * not deleted. */ static int release_inode_blocks(e2fsck_t ctx, ext2_ino_t ino, - struct ext2_inode *inode, char *block_buf, + struct ext2_inode_large *inode, char *block_buf, struct problem_context *pctx) { struct process_block_struct pb; ext2_filsys fs = ctx->fs; + blk64_t blk; errcode_t retval; __u32 count; - if (!ext2fs_inode_has_valid_blocks(inode)) + if (!ext2fs_inode_has_valid_blocks2(fs, EXT2_INODE(inode))) return 0; pb.buf = block_buf + 3 * ctx->fs->blocksize; @@ -178,11 +203,12 @@ static int release_inode_blocks(e2fsck_t ctx, ext2_ino_t ino, pb.abort = 0; pb.errcode = 0; pb.pctx = pctx; + pb.last_cluster = 0; + pb.inode = inode; if (inode->i_links_count) { pb.truncating = 1; - pb.truncate_block = (blk_t) - ((((long long)inode->i_size_high << 32) + - inode->i_size + fs->blocksize - 1) / + pb.truncate_block = (e2_blkcnt_t) + ((EXT2_I_SIZE(inode) + fs->blocksize - 1) / fs->blocksize); pb.truncate_offset = inode->i_size % fs->blocksize; } else { @@ -191,11 +217,11 @@ static int release_inode_blocks(e2fsck_t ctx, ext2_ino_t ino, pb.truncate_offset = 0; } pb.truncated_blocks = 0; - retval = ext2fs_block_iterate(fs, ino, BLOCK_FLAG_DEPTH_TRAVERSE, + retval = ext2fs_block_iterate3(fs, ino, BLOCK_FLAG_DEPTH_TRAVERSE, block_buf, release_inode_block, &pb); if (retval) { com_err("release_inode_blocks", retval, - _("while calling ext2fs_block_iterate for inode %d"), + _("while calling ext2fs_block_iterate for inode %u"), ino); return 1; } @@ -203,32 +229,91 @@ static int release_inode_blocks(e2fsck_t ctx, ext2_ino_t ino, return 1; /* Refresh the inode since ext2fs_block_iterate may have changed it */ - e2fsck_read_inode(ctx, ino, inode, "release_inode_blocks"); + e2fsck_read_inode_full(ctx, ino, EXT2_INODE(inode), sizeof(*inode), + "release_inode_blocks"); if (pb.truncated_blocks) - inode->i_blocks -= pb.truncated_blocks * - (fs->blocksize / 512); + ext2fs_iblk_sub_blocks(fs, EXT2_INODE(inode), + pb.truncated_blocks); - if (inode->i_file_acl) { - retval = ext2fs_adjust_ea_refcount(fs, inode->i_file_acl, - block_buf, -1, &count); + blk = ext2fs_file_acl_block(fs, EXT2_INODE(inode)); + if (blk) { + retval = ext2fs_adjust_ea_refcount3(fs, blk, block_buf, -1, + &count, ino); if (retval == EXT2_ET_BAD_EA_BLOCK_NUM) { retval = 0; count = 1; } if (retval) { com_err("release_inode_blocks", retval, - _("while calling ext2fs_adjust_ea_refocunt for inode %d"), + _("while calling ext2fs_adjust_ea_refcount2 for inode %u"), ino); return 1; } - if (count == 0) - ext2fs_block_alloc_stats(fs, inode->i_file_acl, -1); - inode->i_file_acl = 0; + if (count == 0) { + if (ctx->qctx) + quota_data_sub(ctx->qctx, inode, 0, + ctx->fs->blocksize); + ext2fs_block_alloc_stats2(fs, blk, -1); + ctx->free_blocks++; + } + ext2fs_file_acl_block_set(fs, EXT2_INODE(inode), 0); } return 0; } +/* Load all quota data in preparation for orphan clearing. */ +static errcode_t e2fsck_read_all_quotas(e2fsck_t ctx) +{ + ext2_ino_t qf_ino; + enum quota_type qtype; + errcode_t retval = 0; + + if (!ext2fs_has_feature_quota(ctx->fs->super)) + return retval; + + retval = quota_init_context(&ctx->qctx, ctx->fs, 0); + if (retval) + return retval; + + for (qtype = 0 ; qtype < MAXQUOTAS; qtype++) { + qf_ino = *quota_sb_inump(ctx->fs->super, qtype); + if (qf_ino == 0) + continue; + + retval = quota_read_all_dquots(ctx->qctx, qf_ino, qtype, + QREAD_USAGE | QREAD_LIMITS); + if (retval) + break; + } + if (retval) + quota_release_context(&ctx->qctx); + return retval; +} + +/* Write all the quota info to disk. */ +static errcode_t e2fsck_write_all_quotas(e2fsck_t ctx) +{ + struct problem_context pctx; + enum quota_type qtype; + + if (!ext2fs_has_feature_quota(ctx->fs->super)) + return 0; + + clear_problem_context(&pctx); + for (qtype = 0 ; qtype < MAXQUOTAS; qtype++) { + pctx.num = qtype; + pctx.errcode = quota_write_inode(ctx->qctx, 1 << qtype); + if (pctx.errcode) { + fix_problem(ctx, PR_6_WRITE_QUOTAS, &pctx); + break; + } + } + + quota_release_context(&ctx->qctx); + return pctx.errcode; +} + /* * This function releases all of the orphan inodes. It returns 1 if * it hit some error, and 0 on success. @@ -237,13 +322,20 @@ static int release_orphan_inodes(e2fsck_t ctx) { ext2_filsys fs = ctx->fs; ext2_ino_t ino, next_ino; - struct ext2_inode inode; + struct ext2_inode_large inode; struct problem_context pctx; char *block_buf; if ((ino = fs->super->s_last_orphan) == 0) return 0; + clear_problem_context(&pctx); + pctx.errcode = e2fsck_read_all_quotas(ctx); + if (pctx.errcode) { + fix_problem(ctx, PR_0_QUOTA_INIT_CTX, &pctx); + return 1; + } + /* * Win or lose, we won't be using the head of the orphan inode * list again. @@ -256,26 +348,30 @@ static int release_orphan_inodes(e2fsck_t ctx) * list, since the orphan list can't be trusted; and we're * going to be running a full e2fsck run anyway... */ - if (fs->super->s_state & EXT2_ERROR_FS) + if (fs->super->s_state & EXT2_ERROR_FS) { + if (ctx->qctx) + quota_release_context(&ctx->qctx); return 0; - + } + if ((ino < EXT2_FIRST_INODE(fs->super)) || (ino > fs->super->s_inodes_count)) { clear_problem_context(&pctx); pctx.ino = ino; fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_HEAD_INODE, &pctx); - return 1; + goto err_qctx; } block_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize * 4, "block iterate buffer"); e2fsck_read_bitmaps(ctx); - + while (ino) { - e2fsck_read_inode(ctx, ino, &inode, "release_orphan_inodes"); + e2fsck_read_inode_full(ctx, ino, EXT2_INODE(&inode), + sizeof(inode), "release_orphan_inodes"); clear_problem_context(&pctx); pctx.ino = ino; - pctx.inode = &inode; + pctx.inode = EXT2_INODE(&inode); pctx.str = inode.i_links_count ? _("Truncating") : _("Clearing"); @@ -287,49 +383,230 @@ static int release_orphan_inodes(e2fsck_t ctx) (next_ino > fs->super->s_inodes_count))) { pctx.ino = next_ino; fix_problem(ctx, PR_0_ORPHAN_ILLEGAL_INODE, &pctx); - goto return_abort; + goto err_buf; } if (release_inode_blocks(ctx, ino, &inode, block_buf, &pctx)) - goto return_abort; + goto err_buf; if (!inode.i_links_count) { + if (ctx->qctx) + quota_data_inodes(ctx->qctx, &inode, ino, -1); ext2fs_inode_alloc_stats2(fs, ino, -1, LINUX_S_ISDIR(inode.i_mode)); - inode.i_dtime = time(0); + ctx->free_inodes++; + inode.i_dtime = ctx->now; } else { inode.i_dtime = 0; } - e2fsck_write_inode(ctx, ino, &inode, "delete_file"); + e2fsck_write_inode_full(ctx, ino, EXT2_INODE(&inode), + sizeof(inode), "delete_file"); ino = next_ino; } - ext2fs_free_mem((void **) &block_buf); + ext2fs_free_mem(&block_buf); + pctx.errcode = e2fsck_write_all_quotas(ctx); + if (pctx.errcode) + goto err; return 0; -return_abort: - ext2fs_free_mem((void **) &block_buf); +err_buf: + ext2fs_free_mem(&block_buf); +err_qctx: + if (ctx->qctx) + quota_release_context(&ctx->qctx); +err: return 1; } +/* + * Check the resize inode to make sure it is sane. We check both for + * the case where on-line resizing is not enabled (in which case the + * resize inode should be cleared) as well as the case where on-line + * resizing is enabled. + */ +void check_resize_inode(e2fsck_t ctx) +{ + ext2_filsys fs = ctx->fs; + struct ext2_inode inode; + struct problem_context pctx; + int i, gdt_off, ind_off; + dgrp_t j; + blk_t blk, pblk; + blk_t expect; /* for resize inode, which is 32-bit only */ + __u32 *dind_buf = 0, *ind_buf; + errcode_t retval; + + clear_problem_context(&pctx); + + if (ext2fs_has_feature_resize_inode(fs->super) && + ext2fs_has_feature_meta_bg(fs->super) && + fix_problem(ctx, PR_0_DISABLE_RESIZE_INODE, &pctx)) { + ext2fs_clear_feature_resize_inode(fs->super); + fs->super->s_reserved_gdt_blocks = 0; + ext2fs_mark_super_dirty(fs); + } + + /* + * If the resize inode feature isn't set, then + * s_reserved_gdt_blocks must be zero. + */ + if (!ext2fs_has_feature_resize_inode(fs->super)) { + if (fs->super->s_reserved_gdt_blocks) { + pctx.num = fs->super->s_reserved_gdt_blocks; + if (fix_problem(ctx, PR_0_NONZERO_RESERVED_GDT_BLOCKS, + &pctx)) { + fs->super->s_reserved_gdt_blocks = 0; + ext2fs_mark_super_dirty(fs); + } + } + } + + /* Read the resize inode */ + pctx.ino = EXT2_RESIZE_INO; + retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode); + if (retval) { + if (ext2fs_has_feature_resize_inode(fs->super)) + ctx->flags |= E2F_FLAG_RESIZE_INODE; + return; + } + + /* + * If the resize inode feature isn't set, check to make sure + * the resize inode is cleared; then we're done. + */ + if (!ext2fs_has_feature_resize_inode(fs->super)) { + for (i=0; i < EXT2_N_BLOCKS; i++) { + if (inode.i_block[i]) + break; + } + if ((i < EXT2_N_BLOCKS) && + fix_problem(ctx, PR_0_CLEAR_RESIZE_INODE, &pctx)) { + memset(&inode, 0, sizeof(inode)); + e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode, + "clear_resize"); + } + return; + } + + /* + * The resize inode feature is enabled; check to make sure the + * only block in use is the double indirect block + */ + blk = inode.i_block[EXT2_DIND_BLOCK]; + for (i=0; i < EXT2_N_BLOCKS; i++) { + if (i != EXT2_DIND_BLOCK && inode.i_block[i]) + break; + } + if ((i < EXT2_N_BLOCKS) || !blk || !inode.i_links_count || + !(inode.i_mode & LINUX_S_IFREG) || + (blk < fs->super->s_first_data_block || + blk >= ext2fs_blocks_count(fs->super))) { + resize_inode_invalid: + if (fix_problem(ctx, PR_0_RESIZE_INODE_INVALID, &pctx)) { + memset(&inode, 0, sizeof(inode)); + e2fsck_write_inode(ctx, EXT2_RESIZE_INO, &inode, + "clear_resize"); + ctx->flags |= E2F_FLAG_RESIZE_INODE; + } + if (!(ctx->options & E2F_OPT_READONLY)) { + fs->super->s_state &= ~EXT2_VALID_FS; + ext2fs_mark_super_dirty(fs); + } + goto cleanup; + } + dind_buf = (__u32 *) e2fsck_allocate_memory(ctx, fs->blocksize * 2, + "resize dind buffer"); + ind_buf = (__u32 *) ((char *) dind_buf + fs->blocksize); + + retval = ext2fs_read_ind_block(fs, blk, dind_buf); + if (retval) + goto resize_inode_invalid; + + gdt_off = fs->desc_blocks; + pblk = fs->super->s_first_data_block + 1 + fs->desc_blocks; + if (fs->blocksize == 1024 && fs->super->s_first_data_block == 0) + pblk++; /* Deal with 1024 blocksize bigalloc fs */ + for (i = 0; i < fs->super->s_reserved_gdt_blocks / 4; + i++, gdt_off++, pblk++) { + gdt_off %= fs->blocksize/4; + if (dind_buf[gdt_off] != pblk) + goto resize_inode_invalid; + retval = ext2fs_read_ind_block(fs, pblk, ind_buf); + if (retval) + goto resize_inode_invalid; + ind_off = 0; + for (j = 1; j < fs->group_desc_count; j++) { + if (!ext2fs_bg_has_super(fs, j)) + continue; + expect = pblk + EXT2_GROUPS_TO_BLOCKS(fs->super, j); + if (ind_buf[ind_off] != expect) + goto resize_inode_invalid; + ind_off++; + } + } + +cleanup: + if (dind_buf) + ext2fs_free_mem(&dind_buf); + + } + +/* + * This function checks the dirhash signed/unsigned hint if necessary. + */ +static void e2fsck_fix_dirhash_hint(e2fsck_t ctx) +{ + struct ext2_super_block *sb = ctx->fs->super; + struct problem_context pctx; + char c; + + if ((ctx->options & E2F_OPT_READONLY) || + !ext2fs_has_feature_dir_index(sb) || + (sb->s_flags & (EXT2_FLAGS_SIGNED_HASH|EXT2_FLAGS_UNSIGNED_HASH))) + return; + + c = (char) 255; + + clear_problem_context(&pctx); + if (fix_problem(ctx, PR_0_DIRHASH_HINT, &pctx)) { + if (((int) c) == -1) { + sb->s_flags |= EXT2_FLAGS_SIGNED_HASH; + } else { + sb->s_flags |= EXT2_FLAGS_UNSIGNED_HASH; + } + ext2fs_mark_super_dirty(ctx->fs); + } +} + void check_super_block(e2fsck_t ctx) { ext2_filsys fs = ctx->fs; - blk_t first_block, last_block; + blk64_t first_block, last_block; struct ext2_super_block *sb = fs->super; - blk_t blocks_per_group = fs->super->s_blocks_per_group; - blk_t bpg_max; + unsigned int ipg_max; + problem_t problem; + blk64_t blocks_per_group = fs->super->s_blocks_per_group; + __u32 bpg_max, cpg_max; + __u64 blks_max; int inodes_per_block; - int ipg_max; + int inode_size; + int accept_time_fudge; + int broken_system_clock; dgrp_t i; - blk_t should_be; + blk64_t should_be; struct problem_context pctx; - __u32 free_blocks = 0, free_inodes = 0; + blk64_t free_blocks = 0; + ext2_ino_t free_inodes = 0; + int csum_flag, clear_test_fs_flag; inodes_per_block = EXT2_INODES_PER_BLOCK(fs->super); ipg_max = inodes_per_block * (blocks_per_group - 4); if (ipg_max > EXT2_MAX_INODES_PER_GROUP(sb)) ipg_max = EXT2_MAX_INODES_PER_GROUP(sb); - bpg_max = 8 * EXT2_BLOCK_SIZE(sb); + cpg_max = 8 * EXT2_BLOCK_SIZE(sb); + if (cpg_max > EXT2_MAX_CLUSTERS_PER_GROUP(sb)) + cpg_max = EXT2_MAX_CLUSTERS_PER_GROUP(sb); + bpg_max = 8 * EXT2_BLOCK_SIZE(sb) * EXT2FS_CLUSTER_RATIO(fs); if (bpg_max > EXT2_MAX_BLOCKS_PER_GROUP(sb)) bpg_max = EXT2_MAX_BLOCKS_PER_GROUP(sb); @@ -340,69 +617,113 @@ void check_super_block(e2fsck_t ctx) ctx->invalid_inode_table_flag = (int *) e2fsck_allocate_memory(ctx, sizeof(int) * fs->group_desc_count, "invalid_inode_table"); + blks_max = (1ULL << 32) * EXT2_MAX_BLOCKS_PER_GROUP(fs->super); + if (ext2fs_has_feature_64bit(fs->super)) { + if (blks_max > ((1ULL << 48) - 1)) + blks_max = (1ULL << 48) - 1; + } else { + if (blks_max > ((1ULL << 32) - 1)) + blks_max = (1ULL << 32) - 1; + } + clear_problem_context(&pctx); /* * Verify the super block constants... */ - check_super_value(ctx, "inodes_count", sb->s_inodes_count, - MIN_CHECK, 1, 0); - check_super_value(ctx, "blocks_count", sb->s_blocks_count, - MIN_CHECK, 1, 0); - check_super_value(ctx, "first_data_block", sb->s_first_data_block, - MAX_CHECK, 0, sb->s_blocks_count); - check_super_value(ctx, "log_block_size", sb->s_log_block_size, - MIN_CHECK | MAX_CHECK, 0, - EXT2_MAX_BLOCK_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE); - check_super_value(ctx, "log_frag_size", sb->s_log_frag_size, - MIN_CHECK | MAX_CHECK, 0, sb->s_log_block_size); - check_super_value(ctx, "frags_per_group", sb->s_frags_per_group, - MIN_CHECK | MAX_CHECK, sb->s_blocks_per_group, - bpg_max); - check_super_value(ctx, "blocks_per_group", sb->s_blocks_per_group, - MIN_CHECK | MAX_CHECK, 8, bpg_max); - check_super_value(ctx, "inodes_per_group", sb->s_inodes_per_group, - MIN_CHECK | MAX_CHECK, inodes_per_block, ipg_max); - check_super_value(ctx, "r_blocks_count", sb->s_r_blocks_count, - MAX_CHECK, 0, sb->s_blocks_count / 4); - - if (!ctx->num_blocks) { - pctx.errcode = e2fsck_get_device_size(ctx); - if (pctx.errcode && pctx.errcode != EXT2_ET_UNIMPLEMENTED) { - fix_problem(ctx, PR_0_GETSIZE_ERROR, &pctx); + if (!check_super_value(ctx, "inodes_count", sb->s_inodes_count, + MIN_CHECK, 1, 0)) + return; + if (!check_super_value64(ctx, "blocks_count", ext2fs_blocks_count(sb), + MIN_CHECK | MAX_CHECK, 1, blks_max)) + return; + if (!check_super_value(ctx, "first_data_block", sb->s_first_data_block, + MAX_CHECK, 0, ext2fs_blocks_count(sb))) + return; + if (!check_super_value(ctx, "log_block_size", sb->s_log_block_size, + MIN_CHECK | MAX_CHECK, 0, + EXT2_MAX_BLOCK_LOG_SIZE - EXT2_MIN_BLOCK_LOG_SIZE)) + return; + if (!check_super_value(ctx, "log_cluster_size", + sb->s_log_cluster_size, + MIN_CHECK | MAX_CHECK, sb->s_log_block_size, + (EXT2_MAX_CLUSTER_LOG_SIZE - + EXT2_MIN_CLUSTER_LOG_SIZE))) + return; + if (!check_super_value(ctx, "clusters_per_group", + sb->s_clusters_per_group, + MIN_CHECK | MAX_CHECK, 8, cpg_max)) + return; + if (!check_super_value(ctx, "blocks_per_group", sb->s_blocks_per_group, + MIN_CHECK | MAX_CHECK, 8, bpg_max)) + return; + if (!check_super_value(ctx, "inodes_per_group", sb->s_inodes_per_group, + MIN_CHECK | MAX_CHECK, inodes_per_block, ipg_max)) + return; + if (!check_super_value(ctx, "r_blocks_count", ext2fs_r_blocks_count(sb), + MAX_CHECK, 0, ext2fs_blocks_count(sb) / 2)) + return; + if (!check_super_value(ctx, "reserved_gdt_blocks", + sb->s_reserved_gdt_blocks, MAX_CHECK, 0, + fs->blocksize / sizeof(__u32))) + return; + if (!check_super_value(ctx, "desc_size", + sb->s_desc_size, MAX_CHECK | LOG2_CHECK, 0, + EXT2_MAX_DESC_SIZE)) + return; + + should_be = (__u64)sb->s_inodes_per_group * fs->group_desc_count; + if (should_be > ~0U) { + pctx.num = should_be; + fix_problem(ctx, PR_0_INODE_COUNT_BIG, &pctx); + ctx->flags |= E2F_FLAG_ABORT; + return; + } + if (sb->s_inodes_count != should_be) { + pctx.ino = sb->s_inodes_count; + pctx.ino2 = should_be; + if (fix_problem(ctx, PR_0_INODE_COUNT_WRONG, &pctx)) { + sb->s_inodes_count = should_be; + ext2fs_mark_super_dirty(fs); + } else { + pctx.num = sb->s_inodes_count; + pctx.str = "inodes_count"; + fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx); ctx->flags |= E2F_FLAG_ABORT; return; } - if ((pctx.errcode != EXT2_ET_UNIMPLEMENTED) && - (ctx->num_blocks < sb->s_blocks_count)) { - pctx.blk = sb->s_blocks_count; - pctx.blk2 = ctx->num_blocks; - if (fix_problem(ctx, PR_0_FS_SIZE_WRONG, &pctx)) { - ctx->flags |= E2F_FLAG_ABORT; - return; - } - } } - - if (sb->s_log_block_size != sb->s_log_frag_size) { - pctx.blk = EXT2_BLOCK_SIZE(sb); - pctx.blk2 = EXT2_FRAG_SIZE(sb); - fix_problem(ctx, PR_0_NO_FRAGMENTS, &pctx); + if (sb->s_rev_level > EXT2_GOOD_OLD_REV && + !check_super_value(ctx, "first_ino", sb->s_first_ino, + MIN_CHECK | MAX_CHECK, + EXT2_GOOD_OLD_FIRST_INO, sb->s_inodes_count)) + return; + inode_size = EXT2_INODE_SIZE(sb); + if (!check_super_value(ctx, "inode_size", + inode_size, MIN_CHECK | MAX_CHECK | LOG2_CHECK, + EXT2_GOOD_OLD_INODE_SIZE, fs->blocksize)) + return; + if (sb->s_blocks_per_group != (sb->s_clusters_per_group * + EXT2FS_CLUSTER_RATIO(fs))) { + pctx.num = sb->s_clusters_per_group * EXT2FS_CLUSTER_RATIO(fs); + pctx.str = "block_size"; + fix_problem(ctx, PR_0_MISC_CORRUPT_SUPER, &pctx); ctx->flags |= E2F_FLAG_ABORT; return; } - should_be = sb->s_frags_per_group >> - (sb->s_log_block_size - sb->s_log_frag_size); - if (sb->s_blocks_per_group != should_be) { - pctx.blk = sb->s_blocks_per_group; - pctx.blk2 = should_be; - fix_problem(ctx, PR_0_BLOCKS_PER_GROUP, &pctx); - ctx->flags |= E2F_FLAG_ABORT; - return; + if ((ctx->flags & E2F_FLAG_GOT_DEVSIZE) && + (ctx->num_blocks < ext2fs_blocks_count(sb))) { + pctx.blk = ext2fs_blocks_count(sb); + pctx.blk2 = ctx->num_blocks; + if (fix_problem(ctx, PR_0_FS_SIZE_WRONG, &pctx)) { + ctx->flags |= E2F_FLAG_ABORT; + return; + } } - should_be = (sb->s_log_block_size == 0) ? 1 : 0; + should_be = (sb->s_log_block_size == 0 && + EXT2FS_CLUSTER_RATIO(fs) == 1) ? 1 : 0; if (sb->s_first_data_block != should_be) { pctx.blk = sb->s_first_data_block; pctx.blk2 = should_be; @@ -411,12 +732,75 @@ void check_super_block(e2fsck_t ctx) return; } - should_be = sb->s_inodes_per_group * fs->group_desc_count; - if (sb->s_inodes_count != should_be) { - pctx.ino = sb->s_inodes_count; - pctx.ino2 = should_be; - if (fix_problem(ctx, PR_0_INODE_COUNT_WRONG, &pctx)) { - sb->s_inodes_count = should_be; + if (EXT2_INODE_SIZE(sb) > EXT2_GOOD_OLD_INODE_SIZE) { + unsigned min = + sizeof(((struct ext2_inode_large *) 0)->i_extra_isize) + + sizeof(((struct ext2_inode_large *) 0)->i_checksum_hi); + unsigned max = EXT2_INODE_SIZE(sb) - EXT2_GOOD_OLD_INODE_SIZE; + pctx.num = sb->s_min_extra_isize; + if (sb->s_min_extra_isize && + (sb->s_min_extra_isize < min || + sb->s_min_extra_isize > max || + sb->s_min_extra_isize & 3) && + fix_problem(ctx, PR_0_BAD_MIN_EXTRA_ISIZE, &pctx)) { + sb->s_min_extra_isize = + (sizeof(struct ext2_inode_large) - + EXT2_GOOD_OLD_INODE_SIZE); + ext2fs_mark_super_dirty(fs); + } + pctx.num = sb->s_want_extra_isize; + if (sb->s_want_extra_isize && + (sb->s_want_extra_isize < min || + sb->s_want_extra_isize > max || + sb->s_want_extra_isize & 3) && + fix_problem(ctx, PR_0_BAD_WANT_EXTRA_ISIZE, &pctx)) { + sb->s_want_extra_isize = + (sizeof(struct ext2_inode_large) - + EXT2_GOOD_OLD_INODE_SIZE); + ext2fs_mark_super_dirty(fs); + } + } + + /* Are metadata_csum and uninit_bg both set? */ + if (ext2fs_has_feature_metadata_csum(fs->super) && + ext2fs_has_feature_gdt_csum(fs->super) && + fix_problem(ctx, PR_0_META_AND_GDT_CSUM_SET, &pctx)) { + ext2fs_clear_feature_gdt_csum(fs->super); + ext2fs_mark_super_dirty(fs); + for (i = 0; i < fs->group_desc_count; i++) + ext2fs_group_desc_csum_set(fs, i); + } + + /* We can't have ^metadata_csum,metadata_csum_seed */ + if (!ext2fs_has_feature_metadata_csum(fs->super) && + ext2fs_has_feature_csum_seed(fs->super) && + fix_problem(ctx, PR_0_CSUM_SEED_WITHOUT_META_CSUM, &pctx)) { + ext2fs_clear_feature_csum_seed(fs->super); + fs->super->s_checksum_seed = 0; + ext2fs_mark_super_dirty(fs); + } + + /* Is 64bit set and extents unset? */ + if (ext2fs_has_feature_64bit(fs->super) && + !ext2fs_has_feature_extents(fs->super) && + fix_problem(ctx, PR_0_64BIT_WITHOUT_EXTENTS, &pctx)) { + ext2fs_set_feature_extents(fs->super); + ext2fs_mark_super_dirty(fs); + } + + /* Did user ask us to convert files to extents? */ + if (ctx->options & E2F_OPT_CONVERT_BMAP) { + ext2fs_set_feature_extents(fs->super); + ext2fs_mark_super_dirty(fs); + } + + if (ext2fs_has_feature_meta_bg(fs->super) && + (fs->super->s_first_meta_bg > fs->desc_blocks)) { + pctx.group = fs->desc_blocks; + pctx.num = fs->super->s_first_meta_bg; + if (fix_problem(ctx, PR_0_FIRST_META_BG_TOO_BIG, &pctx)) { + ext2fs_clear_feature_meta_bg(fs->super); + fs->super->s_first_meta_bg = 0; ext2fs_mark_super_dirty(fs); } } @@ -424,102 +808,175 @@ void check_super_block(e2fsck_t ctx) /* * Verify the group descriptors.... */ - first_block = fs->super->s_first_data_block; - last_block = first_block + blocks_per_group; + first_block = sb->s_first_data_block; + last_block = ext2fs_blocks_count(sb)-1; + csum_flag = ext2fs_has_group_desc_csum(fs); for (i = 0; i < fs->group_desc_count; i++) { pctx.group = i; - - if (i == fs->group_desc_count - 1) - last_block = fs->super->s_blocks_count; - if ((fs->group_desc[i].bg_block_bitmap < first_block) || - (fs->group_desc[i].bg_block_bitmap >= last_block)) { - pctx.blk = fs->group_desc[i].bg_block_bitmap; + + if (!ext2fs_has_feature_flex_bg(fs->super)) { + first_block = ext2fs_group_first_block2(fs, i); + last_block = ext2fs_group_last_block2(fs, i); + } + + if ((ext2fs_block_bitmap_loc(fs, i) < first_block) || + (ext2fs_block_bitmap_loc(fs, i) > last_block)) { + pctx.blk = ext2fs_block_bitmap_loc(fs, i); if (fix_problem(ctx, PR_0_BB_NOT_GROUP, &pctx)) - fs->group_desc[i].bg_block_bitmap = 0; + ext2fs_block_bitmap_loc_set(fs, i, 0); } - if (fs->group_desc[i].bg_block_bitmap == 0) { + if (ext2fs_block_bitmap_loc(fs, i) == 0) { ctx->invalid_block_bitmap_flag[i]++; ctx->invalid_bitmaps++; } - if ((fs->group_desc[i].bg_inode_bitmap < first_block) || - (fs->group_desc[i].bg_inode_bitmap >= last_block)) { - pctx.blk = fs->group_desc[i].bg_inode_bitmap; + if ((ext2fs_inode_bitmap_loc(fs, i) < first_block) || + (ext2fs_inode_bitmap_loc(fs, i) > last_block)) { + pctx.blk = ext2fs_inode_bitmap_loc(fs, i); if (fix_problem(ctx, PR_0_IB_NOT_GROUP, &pctx)) - fs->group_desc[i].bg_inode_bitmap = 0; + ext2fs_inode_bitmap_loc_set(fs, i, 0); } - if (fs->group_desc[i].bg_inode_bitmap == 0) { + if (ext2fs_inode_bitmap_loc(fs, i) == 0) { ctx->invalid_inode_bitmap_flag[i]++; ctx->invalid_bitmaps++; } - if ((fs->group_desc[i].bg_inode_table < first_block) || - ((fs->group_desc[i].bg_inode_table + - fs->inode_blocks_per_group - 1) >= last_block)) { - pctx.blk = fs->group_desc[i].bg_inode_table; + if ((ext2fs_inode_table_loc(fs, i) < first_block) || + ((ext2fs_inode_table_loc(fs, i) + + fs->inode_blocks_per_group - 1) > last_block)) { + pctx.blk = ext2fs_inode_table_loc(fs, i); if (fix_problem(ctx, PR_0_ITABLE_NOT_GROUP, &pctx)) - fs->group_desc[i].bg_inode_table = 0; + ext2fs_inode_table_loc_set(fs, i, 0); } - if (fs->group_desc[i].bg_inode_table == 0) { + if (ext2fs_inode_table_loc(fs, i) == 0) { ctx->invalid_inode_table_flag[i]++; ctx->invalid_bitmaps++; } - free_blocks += fs->group_desc[i].bg_free_blocks_count; - free_inodes += fs->group_desc[i].bg_free_inodes_count; - first_block += fs->super->s_blocks_per_group; - last_block += fs->super->s_blocks_per_group; + free_blocks += ext2fs_bg_free_blocks_count(fs, i); + free_inodes += ext2fs_bg_free_inodes_count(fs, i); + + if ((ext2fs_bg_free_blocks_count(fs, i) > sb->s_blocks_per_group) || + (ext2fs_bg_free_inodes_count(fs, i) > sb->s_inodes_per_group) || + (ext2fs_bg_used_dirs_count(fs, i) > sb->s_inodes_per_group)) + ext2fs_unmark_valid(fs); + + should_be = 0; + if (!ext2fs_group_desc_csum_verify(fs, i)) { + pctx.csum1 = ext2fs_bg_checksum(fs, i); + pctx.csum2 = ext2fs_group_desc_csum(fs, i); + if (fix_problem(ctx, PR_0_GDT_CSUM, &pctx)) { + ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT); + ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT); + ext2fs_bg_itable_unused_set(fs, i, 0); + should_be = 1; + } + ext2fs_unmark_valid(fs); + } + + if (!csum_flag && + (ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT) || + ext2fs_bg_flags_test(fs, i, EXT2_BG_INODE_UNINIT) || + ext2fs_bg_itable_unused(fs, i) != 0)) { + if (fix_problem(ctx, PR_0_GDT_UNINIT, &pctx)) { + ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT); + ext2fs_bg_flags_clear(fs, i, EXT2_BG_INODE_UNINIT); + ext2fs_bg_itable_unused_set(fs, i, 0); + should_be = 1; + } + ext2fs_unmark_valid(fs); + } + + if (i == fs->group_desc_count - 1 && + ext2fs_bg_flags_test(fs, i, EXT2_BG_BLOCK_UNINIT)) { + if (fix_problem(ctx, PR_0_BB_UNINIT_LAST, &pctx)) { + ext2fs_bg_flags_clear(fs, i, EXT2_BG_BLOCK_UNINIT); + should_be = 1; + } + ext2fs_unmark_valid(fs); + } + + if (csum_flag && + (ext2fs_bg_itable_unused(fs, i) > ext2fs_bg_free_inodes_count(fs, i) || + ext2fs_bg_itable_unused(fs, i) > sb->s_inodes_per_group)) { + pctx.blk = ext2fs_bg_itable_unused(fs, i); + if (fix_problem(ctx, PR_0_GDT_ITABLE_UNUSED, &pctx)) { + ext2fs_bg_itable_unused_set(fs, i, 0); + should_be = 1; + } + ext2fs_unmark_valid(fs); + } + + if (should_be) + ext2fs_group_desc_csum_set(fs, i); + /* If the user aborts e2fsck by typing ^C, stop right away */ + if (ctx->flags & E2F_FLAG_SIGNAL_MASK) + return; } + + ctx->free_blocks = EXT2FS_C2B(fs, free_blocks); + ctx->free_inodes = free_inodes; + + if ((ext2fs_free_blocks_count(sb) > ext2fs_blocks_count(sb)) || + (sb->s_free_inodes_count > sb->s_inodes_count)) + ext2fs_unmark_valid(fs); + + /* * If we have invalid bitmaps, set the error state of the * filesystem. */ if (ctx->invalid_bitmaps && !(ctx->options & E2F_OPT_READONLY)) { - fs->super->s_state &= ~EXT2_VALID_FS; + sb->s_state &= ~EXT2_VALID_FS; ext2fs_mark_super_dirty(fs); } clear_problem_context(&pctx); - + #ifndef EXT2_SKIP_UUID /* * If the UUID field isn't assigned, assign it. + * Skip if checksums are enabled and the filesystem is mounted, + * if the id changes under the kernel remounting rw may fail. */ - if (!(ctx->options & E2F_OPT_READONLY) && uuid_is_null(sb->s_uuid)) { + if (!(ctx->options & E2F_OPT_READONLY) && uuid_is_null(sb->s_uuid) && + !ext2fs_has_feature_metadata_csum(ctx->fs->super) && + (!csum_flag || !(ctx->mount_flags & EXT2_MF_MOUNTED))) { if (fix_problem(ctx, PR_0_ADD_UUID, &pctx)) { uuid_generate(sb->s_uuid); - ext2fs_mark_super_dirty(fs); + ext2fs_init_csum_seed(fs); + fs->flags |= EXT2_FLAG_DIRTY; fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; } } #endif /* - * Update the global counts from the block group counts. This - * is needed for an experimental patch which eliminates - * locking the entire filesystem when allocating blocks or - * inodes; if the filesystem is not unmounted cleanly, the - * global counts may not be accurate. + * Check to see if we should disable the test_fs flag */ + profile_get_boolean(ctx->profile, "options", + "clear_test_fs_flag", 0, 1, + &clear_test_fs_flag); if (!(ctx->options & E2F_OPT_READONLY) && - ((free_blocks != fs->super->s_free_blocks_count) || - (free_inodes != fs->super->s_free_inodes_count))) { - fs->super->s_free_blocks_count = free_blocks; - fs->super->s_free_inodes_count = free_inodes; - ext2fs_mark_super_dirty(fs); + clear_test_fs_flag && + (fs->super->s_flags & EXT2_FLAGS_TEST_FILESYS) && + (fs_proc_check("ext4") || check_for_modules("ext4"))) { + if (fix_problem(ctx, PR_0_CLEAR_TESTFS_FLAG, &pctx)) { + fs->super->s_flags &= ~EXT2_FLAGS_TEST_FILESYS; + fs->flags |= EXT2_FLAG_DIRTY; + fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; + } } - + /* * For the Hurd, check to see if the filetype option is set, * since it doesn't support it. */ if (!(ctx->options & E2F_OPT_READONLY) && fs->super->s_creator_os == EXT2_OS_HURD && - (fs->super->s_feature_incompat & - EXT2_FEATURE_INCOMPAT_FILETYPE)) { + ext2fs_has_feature_filetype(fs->super)) { if (fix_problem(ctx, PR_0_HURD_CLEAR_FILETYPE, &pctx)) { - fs->super->s_feature_incompat &= - ~EXT2_FEATURE_INCOMPAT_FILETYPE; + ext2fs_clear_feature_filetype(fs->super); ext2fs_mark_super_dirty(fs); - + fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; } } @@ -537,6 +994,7 @@ void check_super_block(e2fsck_t ctx) fix_problem(ctx, PR_0_FS_REV_LEVEL, &pctx)) { ext2fs_update_dynamic_rev(fs); ext2fs_mark_super_dirty(fs); + fs->flags &= ~EXT2_FLAG_MASTER_SB_ONLY; } /* @@ -548,10 +1006,177 @@ void check_super_block(e2fsck_t ctx) } /* + * Unfortunately, due to Windows' unfortunate design decision + * to configure the hardware clock to tick localtime, instead + * of the more proper and less error-prone UTC time, many + * users end up in the situation where the system clock is + * incorrectly set at the time when e2fsck is run. + * + * Historically this was usually due to some distributions + * having buggy init scripts and/or installers that didn't + * correctly detect this case and take appropriate + * countermeasures. However, it's still possible, despite the + * best efforts of init script and installer authors to not be + * able to detect this misconfiguration, usually due to a + * buggy or misconfigured virtualization manager or the + * installer not having access to a network time server during + * the installation process. So by default, we allow the + * superblock times to be fudged by up to 24 hours. This can + * be disabled by setting options.accept_time_fudge to the + * boolean value of false in e2fsck.conf. We also support + * options.buggy_init_scripts for backwards compatibility. + */ + profile_get_boolean(ctx->profile, "options", "accept_time_fudge", + 0, 1, &accept_time_fudge); + profile_get_boolean(ctx->profile, "options", "buggy_init_scripts", + 0, accept_time_fudge, &accept_time_fudge); + ctx->time_fudge = accept_time_fudge ? 86400 : 0; + + profile_get_boolean(ctx->profile, "options", "broken_system_clock", + 0, 0, &broken_system_clock); + + /* + * Check to see if the superblock last mount time or last + * write time is in the future. + */ + if (((ctx->options & E2F_OPT_FORCE) || fs->super->s_checkinterval) && + !broken_system_clock && !(ctx->flags & E2F_FLAG_TIME_INSANE) && + (fs->super->s_mtime > (__u32) ctx->now)) { + pctx.num = fs->super->s_mtime; + problem = PR_0_FUTURE_SB_LAST_MOUNT; + if (fs->super->s_mtime <= (__u32) ctx->now + ctx->time_fudge) + problem = PR_0_FUTURE_SB_LAST_MOUNT_FUDGED; + if (fix_problem(ctx, problem, &pctx)) { + fs->super->s_mtime = ctx->now; + fs->flags |= EXT2_FLAG_DIRTY; + } + } + if (((ctx->options & E2F_OPT_FORCE) || fs->super->s_checkinterval) && + !broken_system_clock && !(ctx->flags & E2F_FLAG_TIME_INSANE) && + (fs->super->s_wtime > (__u32) ctx->now)) { + pctx.num = fs->super->s_wtime; + problem = PR_0_FUTURE_SB_LAST_WRITE; + if (fs->super->s_wtime <= (__u32) ctx->now + ctx->time_fudge) + problem = PR_0_FUTURE_SB_LAST_WRITE_FUDGED; + if (fix_problem(ctx, problem, &pctx)) { + fs->super->s_wtime = ctx->now; + fs->flags |= EXT2_FLAG_DIRTY; + } + } + + e2fsck_validate_quota_inodes(ctx); + + /* * Move the ext3 journal file, if necessary. */ e2fsck_move_ext3_journal(ctx); + + /* + * Fix journal hint, if necessary + */ + e2fsck_fix_ext3_journal_hint(ctx); + + /* + * Add dirhash hint if necessary + */ + e2fsck_fix_dirhash_hint(ctx); + + /* + * Hide quota inodes if necessary. + */ + e2fsck_hide_quota(ctx); + return; } +/* + * Check to see if we should backup the master sb to the backup super + * blocks. Returns non-zero if the sb should be backed up. + */ + +/* + * A few flags are set on the fly by the kernel, but only in the + * primary superblock. This is actually a bad thing, and we should + * try to discourage it in the future. In particular, for the newer + * ext4 files, especially EXT4_FEATURE_RO_COMPAT_DIR_NLINK and + * EXT3_FEATURE_INCOMPAT_EXTENTS. So some of these may go away in the + * future. EXT3_FEATURE_INCOMPAT_RECOVER may also get set when + * copying the primary superblock during online resize. + * + * The kernel will set EXT2_FEATURE_COMPAT_EXT_ATTR, but + * unfortunately, we shouldn't ignore it since if it's not set in the + * backup, the extended attributes in the filesystem will be stripped + * away. + */ +#define FEATURE_RO_COMPAT_IGNORE (EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ + EXT4_FEATURE_RO_COMPAT_DIR_NLINK) +#define FEATURE_INCOMPAT_IGNORE (EXT3_FEATURE_INCOMPAT_EXTENTS| \ + EXT3_FEATURE_INCOMPAT_RECOVER) + +int check_backup_super_block(e2fsck_t ctx) +{ + ext2_filsys fs = ctx->fs; + errcode_t retval; + dgrp_t g; + blk64_t sb; + int ret = 0; + char buf[SUPERBLOCK_SIZE]; + struct ext2_super_block *backup_sb; + + /* + * If we are already writing out the backup blocks, then we + * don't need to test. Also, if the filesystem is invalid, or + * the check was aborted or cancelled, we also don't want to + * do the backup. If the filesystem was opened read-only then + * we can't do the backup. + */ + if (((fs->flags & EXT2_FLAG_MASTER_SB_ONLY) == 0) || + !ext2fs_test_valid(fs) || + (fs->super->s_state & EXT2_ERROR_FS) || + (ctx->flags & (E2F_FLAG_ABORT | E2F_FLAG_CANCEL)) || + (ctx->options & E2F_OPT_READONLY)) + return 0; + for (g = 1; g < fs->group_desc_count; g++) { + if (!ext2fs_bg_has_super(fs, g)) + continue; + + sb = ext2fs_group_first_block2(fs, g); + + retval = io_channel_read_blk(fs->io, sb, -SUPERBLOCK_SIZE, + buf); + if (retval) + continue; + backup_sb = (struct ext2_super_block *) buf; +#ifdef WORDS_BIGENDIAN + ext2fs_swap_super(backup_sb); +#endif + if ((backup_sb->s_magic != EXT2_SUPER_MAGIC) || + (backup_sb->s_rev_level > EXT2_LIB_CURRENT_REV) || + ((backup_sb->s_log_block_size + EXT2_MIN_BLOCK_LOG_SIZE) > + EXT2_MAX_BLOCK_LOG_SIZE) || + (EXT2_INODE_SIZE(backup_sb) < EXT2_GOOD_OLD_INODE_SIZE)) + continue; + +#define SUPER_INCOMPAT_DIFFERENT(x) \ + ((fs->super->x & ~FEATURE_INCOMPAT_IGNORE) != \ + (backup_sb->x & ~FEATURE_INCOMPAT_IGNORE)) +#define SUPER_RO_COMPAT_DIFFERENT(x) \ + ((fs->super->x & ~FEATURE_RO_COMPAT_IGNORE) != \ + (backup_sb->x & ~FEATURE_RO_COMPAT_IGNORE)) +#define SUPER_DIFFERENT(x) \ + (fs->super->x != backup_sb->x) + + if (SUPER_DIFFERENT(s_feature_compat) || + SUPER_INCOMPAT_DIFFERENT(s_feature_incompat) || + SUPER_RO_COMPAT_DIFFERENT(s_feature_ro_compat) || + SUPER_DIFFERENT(s_blocks_count) || + SUPER_DIFFERENT(s_blocks_count_hi) || + SUPER_DIFFERENT(s_inodes_count) || + memcmp(fs->super->s_uuid, backup_sb->s_uuid, + sizeof(fs->super->s_uuid))) + ret = 1; + break; + } + return ret; +}