diff options
Diffstat (limited to 'e2fsck/pass3.c')
| -rw-r--r-- | e2fsck/pass3.c | 921 |
1 files changed, 921 insertions, 0 deletions
diff --git a/e2fsck/pass3.c b/e2fsck/pass3.c new file mode 100644 index 0000000..16d243f --- /dev/null +++ b/e2fsck/pass3.c @@ -0,0 +1,921 @@ +/* + * pass3.c -- pass #3 of e2fsck: Check for directory connectivity + * + * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 Theodore Ts'o. + * + * %Begin-Header% + * This file may be redistributed under the terms of the GNU Public + * License. + * %End-Header% + * + * Pass #3 assures that all directories are connected to the + * filesystem tree, using the following algorithm: + * + * First, the root directory is checked to make sure it exists; if + * not, e2fsck will offer to create a new one. It is then marked as + * "done". + * + * Then, pass3 iterates over all directory inodes; for each directory + * it attempts to trace up the filesystem tree, using dirinfo.parent + * until it reaches a directory which has been marked "done". If it + * can not do so, then the directory must be disconnected, and e2fsck + * will offer to reconnect it to /lost+found. While it is chasing + * parent pointers up the filesystem tree, if pass3 sees a directory + * twice, then it has detected a filesystem loop, and it will again + * offer to reconnect the directory to /lost+found in order to break the + * filesystem loop. + * + * Pass 3 also contains the subroutine, e2fsck_reconnect_file() to + * reconnect inodes to /lost+found; this subroutine is also used by + * pass 4. e2fsck_reconnect_file() calls get_lost_and_found(), which + * is responsible for creating /lost+found if it does not exist. + * + * Pass 3 frees the following data structures: + * - The dirinfo directory information cache. + */ + +#include "config.h" +#ifdef HAVE_ERRNO_H +#include <errno.h> +#endif + +#include "e2fsck.h" +#include "problem.h" + +static void check_root(e2fsck_t ctx); +static int check_directory(e2fsck_t ctx, ext2_ino_t ino, + struct problem_context *pctx); +static void fix_dotdot(e2fsck_t ctx, ext2_ino_t ino, ext2_ino_t parent); + +static ext2fs_inode_bitmap inode_loop_detect = 0; +static ext2fs_inode_bitmap inode_done_map = 0; + +void e2fsck_pass3(e2fsck_t ctx) +{ + ext2_filsys fs = ctx->fs; + struct dir_info_iter *iter = NULL; +#ifdef RESOURCE_TRACK + struct resource_track rtrack; +#endif + struct problem_context pctx; + struct dir_info *dir; + unsigned long maxdirs, count; + + init_resource_track(&rtrack, ctx->fs->io); + clear_problem_context(&pctx); + +#ifdef MTRACE + mtrace_print("Pass 3"); +#endif + + if (!(ctx->options & E2F_OPT_PREEN)) + fix_problem(ctx, PR_3_PASS_HEADER, &pctx); + + /* + * Allocate some bitmaps to do loop detection. + */ + pctx.errcode = e2fsck_allocate_inode_bitmap(fs, _("inode done bitmap"), + EXT2FS_BMAP64_AUTODIR, + "inode_done_map", &inode_done_map); + if (pctx.errcode) { + pctx.num = 2; + fix_problem(ctx, PR_3_ALLOCATE_IBITMAP_ERROR, &pctx); + ctx->flags |= E2F_FLAG_ABORT; + goto abort_exit; + } + print_resource_track(ctx, _("Peak memory"), &ctx->global_rtrack, NULL); + + check_root(ctx); + if (ctx->flags & E2F_FLAG_SIGNAL_MASK) + goto abort_exit; + + ext2fs_mark_inode_bitmap2(inode_done_map, EXT2_ROOT_INO); + + maxdirs = e2fsck_get_num_dirinfo(ctx); + count = 1; + + if (ctx->progress) + if ((ctx->progress)(ctx, 3, 0, maxdirs)) + goto abort_exit; + + iter = e2fsck_dir_info_iter_begin(ctx); + while ((dir = e2fsck_dir_info_iter(ctx, iter)) != 0) { + if (ctx->flags & E2F_FLAG_SIGNAL_MASK || + ctx->flags & E2F_FLAG_RESTART) + goto abort_exit; + if (ctx->progress && (ctx->progress)(ctx, 3, count++, maxdirs)) + goto abort_exit; + if (ext2fs_test_inode_bitmap2(ctx->inode_dir_map, dir->ino)) + if (check_directory(ctx, dir->ino, &pctx)) + goto abort_exit; + } + + /* + * Force the creation of /lost+found if not present + */ + if ((ctx->options & E2F_OPT_READONLY) == 0) + e2fsck_get_lost_and_found(ctx, 1); + + /* + * If there are any directories that need to be indexed or + * optimized, do it here. + */ + e2fsck_rehash_directories(ctx); + +abort_exit: + if (iter) + e2fsck_dir_info_iter_end(ctx, iter); + e2fsck_free_dir_info(ctx); + if (inode_loop_detect) { + ext2fs_free_inode_bitmap(inode_loop_detect); + inode_loop_detect = 0; + } + if (inode_done_map) { + ext2fs_free_inode_bitmap(inode_done_map); + inode_done_map = 0; + } + + if (ctx->lnf_repair_block) { + ext2fs_unmark_block_bitmap2(ctx->block_found_map, + ctx->lnf_repair_block); + ctx->lnf_repair_block = 0; + } + if (ctx->root_repair_block) { + ext2fs_unmark_block_bitmap2(ctx->block_found_map, + ctx->root_repair_block); + ctx->root_repair_block = 0; + } + + print_resource_track(ctx, _("Pass 3"), &rtrack, ctx->fs->io); +} + +/* + * This makes sure the root inode is present; if not, we ask if the + * user wants us to create it. Not creating it is a fatal error. + */ +static void check_root(e2fsck_t ctx) +{ + ext2_filsys fs = ctx->fs; + blk64_t blk; + struct ext2_inode_large inode; + struct ext2_inode *iptr = (struct ext2_inode *) &inode; + char * block; + struct problem_context pctx; + + clear_problem_context(&pctx); + + if (ext2fs_test_inode_bitmap2(ctx->inode_used_map, EXT2_ROOT_INO)) { + /* + * If the root inode is not a directory, die here. The + * user must have answered 'no' in pass1 when we + * offered to clear it. + */ + if (!(ext2fs_test_inode_bitmap2(ctx->inode_dir_map, + EXT2_ROOT_INO))) { + fix_problem(ctx, PR_3_ROOT_NOT_DIR_ABORT, &pctx); + ctx->flags |= E2F_FLAG_ABORT; + } + return; + } + + if (!fix_problem(ctx, PR_3_NO_ROOT_INODE, &pctx)) { + fix_problem(ctx, PR_3_NO_ROOT_INODE_ABORT, &pctx); + ctx->flags |= E2F_FLAG_ABORT; + return; + } + + e2fsck_read_bitmaps(ctx); + + /* + * First, find a free block + */ + if (ctx->root_repair_block) { + blk = ctx->root_repair_block; + ctx->root_repair_block = 0; + goto skip_new_block; + } + pctx.errcode = ext2fs_new_block2(fs, 0, ctx->block_found_map, &blk); + if (pctx.errcode) { + pctx.str = "ext2fs_new_block"; + fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); + ctx->flags |= E2F_FLAG_ABORT; + return; + } + ext2fs_mark_block_bitmap2(ctx->block_found_map, blk); +skip_new_block: + ext2fs_mark_block_bitmap2(fs->block_map, blk); + ext2fs_mark_bb_dirty(fs); + + /* + * Set up the inode structure + */ + memset(&inode, 0, sizeof(inode)); + inode.i_mode = 040755; + inode.i_size = fs->blocksize; + inode.i_atime = inode.i_ctime = inode.i_mtime = ctx->now; + inode.i_links_count = 2; + ext2fs_iblk_set(fs, iptr, 1); + inode.i_block[0] = blk; + inode.i_extra_isize = sizeof(struct ext2_inode_large) - + EXT2_GOOD_OLD_INODE_SIZE; + + /* + * Write out the inode. + */ + pctx.errcode = ext2fs_write_new_inode(fs, EXT2_ROOT_INO, iptr); + if (pctx.errcode) { + pctx.str = "ext2fs_write_inode"; + fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); + ctx->flags |= E2F_FLAG_ABORT; + return; + } + + /* + * Now let's create the actual data block for the inode. + * Due to metadata_csum, we must write the dir blocks AFTER + * the inode has been written to disk! + */ + pctx.errcode = ext2fs_new_dir_block(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, + &block); + if (pctx.errcode) { + pctx.str = "ext2fs_new_dir_block"; + fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); + ctx->flags |= E2F_FLAG_ABORT; + return; + } + + pctx.errcode = ext2fs_write_dir_block4(fs, blk, block, 0, + EXT2_ROOT_INO); + ext2fs_free_mem(&block); + if (pctx.errcode) { + pctx.str = "ext2fs_write_dir_block4"; + fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); + ctx->flags |= E2F_FLAG_ABORT; + return; + } + + /* + * Miscellaneous bookkeeping... + */ + e2fsck_add_dir_info(ctx, EXT2_ROOT_INO, EXT2_ROOT_INO); + ext2fs_icount_store(ctx->inode_count, EXT2_ROOT_INO, 2); + ext2fs_icount_store(ctx->inode_link_info, EXT2_ROOT_INO, 2); + + ext2fs_mark_inode_bitmap2(ctx->inode_used_map, EXT2_ROOT_INO); + ext2fs_mark_inode_bitmap2(ctx->inode_dir_map, EXT2_ROOT_INO); + ext2fs_mark_inode_bitmap2(fs->inode_map, EXT2_ROOT_INO); + ext2fs_mark_ib_dirty(fs); + quota_data_add(ctx->qctx, &inode, EXT2_ROOT_INO, + EXT2_CLUSTER_SIZE(fs->super)); + quota_data_inodes(ctx->qctx, &inode, EXT2_ROOT_INO, +1); +} + +/* + * This subroutine is responsible for making sure that a particular + * directory is connected to the root; if it isn't we trace it up as + * far as we can go, and then offer to connect the resulting parent to + * the lost+found. We have to do loop detection; if we ever discover + * a loop, we treat that as a disconnected directory and offer to + * reparent it to lost+found. + * + * However, loop detection is expensive, because for very large + * filesystems, the inode_loop_detect bitmap is huge, and clearing it + * is non-trivial. Loops in filesystems are also a rare error case, + * and we shouldn't optimize for error cases. So we try two passes of + * the algorithm. The first time, we ignore loop detection and merely + * increment a counter; if the counter exceeds some extreme threshold, + * then we try again with the loop detection bitmap enabled. + */ +static int check_directory(e2fsck_t ctx, ext2_ino_t dir, + struct problem_context *pctx) +{ + ext2_filsys fs = ctx->fs; + ext2_ino_t ino = dir, parent; + int loop_pass = 0, parent_count = 0; + + while (1) { + /* + * Mark this inode as being "done"; by the time we + * return from this function, the inode we either be + * verified as being connected to the directory tree, + * or we will have offered to reconnect this to + * lost+found. + * + * If it was marked done already, then we've reached a + * parent we've already checked. + */ + if (ext2fs_mark_inode_bitmap2(inode_done_map, ino)) + break; + + if (e2fsck_dir_info_get_parent(ctx, ino, &parent)) { + fix_problem(ctx, PR_3_NO_DIRINFO, pctx); + return 0; + } + + /* + * If this directory doesn't have a parent, or we've + * seen the parent once already, then offer to + * reparent it to lost+found + */ + if (!parent || + (loop_pass && + ext2fs_test_inode_bitmap2(inode_loop_detect, parent))) { + pctx->ino = ino; + if (parent) + pctx->dir = parent; + else + (void) ext2fs_lookup(fs, ino, "..", 2, NULL, + &pctx->dir); + if (fix_problem(ctx, !parent ? PR_3_UNCONNECTED_DIR : + PR_3_LOOPED_DIR, pctx)) { + if (e2fsck_reconnect_file(ctx, pctx->ino)) { + ext2fs_unmark_valid(fs); + } else { + fix_dotdot(ctx, pctx->ino, + ctx->lost_and_found); + parent = ctx->lost_and_found; + } + } + break; + } + ino = parent; + if (loop_pass) { + ext2fs_mark_inode_bitmap2(inode_loop_detect, ino); + } else if (parent_count++ > 2048) { + /* + * If we've run into a path depth that's + * greater than 2048, try again with the inode + * loop bitmap turned on and start from the + * top. + */ + loop_pass = 1; + if (inode_loop_detect) + ext2fs_clear_inode_bitmap(inode_loop_detect); + else { + pctx->errcode = e2fsck_allocate_inode_bitmap(fs, _("inode loop detection bitmap"), EXT2FS_BMAP64_AUTODIR, "inode_loop_detect", &inode_loop_detect); + if (pctx->errcode) { + pctx->num = 1; + fix_problem(ctx, + PR_3_ALLOCATE_IBITMAP_ERROR, pctx); + ctx->flags |= E2F_FLAG_ABORT; + return -1; + } + } + ino = dir; + } + } + + /* + * Make sure that .. and the parent directory are the same; + * offer to fix it if not. + */ + pctx->ino = dir; + if (e2fsck_dir_info_get_dotdot(ctx, dir, &pctx->ino2) || + e2fsck_dir_info_get_parent(ctx, dir, &pctx->dir)) { + fix_problem(ctx, PR_3_NO_DIRINFO, pctx); + return 0; + } + if (pctx->ino2 != pctx->dir) { + if (fix_problem(ctx, PR_3_BAD_DOT_DOT, pctx)) + fix_dotdot(ctx, dir, pctx->dir); + } + return 0; +} + +/* + * This routine gets the lost_and_found inode, making it a directory + * if necessary + */ +ext2_ino_t e2fsck_get_lost_and_found(e2fsck_t ctx, int fix) +{ + ext2_filsys fs = ctx->fs; + ext2_ino_t ino; + blk64_t blk; + errcode_t retval; + struct ext2_inode_large inode; + char * block; + static const char name[] = "lost+found"; + struct problem_context pctx; + int will_rehash, flags; + + if (ctx->lost_and_found) + return ctx->lost_and_found; + + clear_problem_context(&pctx); + + will_rehash = e2fsck_dir_will_be_rehashed(ctx, EXT2_ROOT_INO); + if (will_rehash) { + flags = ctx->fs->flags; + ctx->fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS; + } + retval = ext2fs_lookup(fs, EXT2_ROOT_INO, name, + sizeof(name)-1, 0, &ino); + if (will_rehash) + ctx->fs->flags = (flags & EXT2_FLAG_IGNORE_CSUM_ERRORS) | + (ctx->fs->flags & ~EXT2_FLAG_IGNORE_CSUM_ERRORS); + if (retval && !fix) + return 0; + if (!retval) { + /* Lost+found shouldn't have inline data */ + retval = ext2fs_read_inode_full(fs, ino, EXT2_INODE(&inode), + sizeof(inode)); + if (fix && retval) + return 0; + + if (fix && (inode.i_flags & EXT4_INLINE_DATA_FL)) { + if (!fix_problem(ctx, PR_3_LPF_INLINE_DATA, &pctx)) + return 0; + goto unlink; + } + + if (fix && (inode.i_flags & EXT4_ENCRYPT_FL)) { + if (!fix_problem(ctx, PR_3_LPF_ENCRYPTED, &pctx)) + return 0; + goto unlink; + } + + if (ext2fs_check_directory(fs, ino) == 0) { + ctx->lost_and_found = ino; + return ino; + } + + /* Lost+found isn't a directory! */ + if (!fix) + return 0; + pctx.ino = ino; + if (!fix_problem(ctx, PR_3_LPF_NOTDIR, &pctx)) + return 0; + +unlink: + /* OK, unlink the old /lost+found file. */ + pctx.errcode = ext2fs_unlink(fs, EXT2_ROOT_INO, name, ino, 0); + if (pctx.errcode) { + pctx.str = "ext2fs_unlink"; + fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx); + return 0; + } + (void) e2fsck_dir_info_set_parent(ctx, ino, 0); + e2fsck_adjust_inode_count(ctx, ino, -1); + /* + * If the old lost+found was a directory, we've just + * disconnected it from the directory tree, which + * means we need to restart the directory tree scan. + * The simplest way to do this is restart the whole + * e2fsck operation. + */ + if (LINUX_S_ISDIR(inode.i_mode)) + ctx->flags |= E2F_FLAG_RESTART; + } else if (retval != EXT2_ET_FILE_NOT_FOUND) { + pctx.errcode = retval; + fix_problem(ctx, PR_3_ERR_FIND_LPF, &pctx); + } + if (!fix_problem(ctx, PR_3_NO_LF_DIR, 0)) + return 0; + + /* + * Read the inode and block bitmaps in; we'll be messing with + * them. + */ + e2fsck_read_bitmaps(ctx); + + /* + * First, find a free block + */ + if (ctx->lnf_repair_block) { + blk = ctx->lnf_repair_block; + ctx->lnf_repair_block = 0; + goto skip_new_block; + } + retval = ext2fs_new_block2(fs, 0, ctx->block_found_map, &blk); + if (retval == EXT2_ET_BLOCK_ALLOC_FAIL && + fix_problem(ctx, PR_3_LPF_NO_SPACE, &pctx)) { + fix_problem(ctx, PR_3_NO_SPACE_TO_RECOVER, &pctx); + ctx->lost_and_found = EXT2_ROOT_INO; + return 0; + } + if (retval) { + pctx.errcode = retval; + fix_problem(ctx, PR_3_ERR_LPF_NEW_BLOCK, &pctx); + return 0; + } + ext2fs_mark_block_bitmap2(ctx->block_found_map, blk); +skip_new_block: + ext2fs_block_alloc_stats2(fs, blk, +1); + + /* + * Next find a free inode. + */ + retval = ext2fs_new_inode(fs, EXT2_ROOT_INO, 040700, + ctx->inode_used_map, &ino); + if (retval == EXT2_ET_INODE_ALLOC_FAIL && + fix_problem(ctx, PR_3_LPF_NO_SPACE, &pctx)) { + fix_problem(ctx, PR_3_NO_SPACE_TO_RECOVER, &pctx); + ctx->lost_and_found = EXT2_ROOT_INO; + return 0; + } + if (retval) { + pctx.errcode = retval; + fix_problem(ctx, PR_3_ERR_LPF_NEW_INODE, &pctx); + return 0; + } + ext2fs_mark_inode_bitmap2(ctx->inode_used_map, ino); + ext2fs_mark_inode_bitmap2(ctx->inode_dir_map, ino); + ext2fs_inode_alloc_stats2(fs, ino, +1, 1); + + /* + * Set up the inode structure + */ + memset(&inode, 0, sizeof(inode)); + inode.i_mode = 040700; + inode.i_size = fs->blocksize; + inode.i_atime = inode.i_ctime = inode.i_mtime = ctx->now; + inode.i_links_count = 2; + ext2fs_iblk_set(fs, EXT2_INODE(&inode), 1); + inode.i_block[0] = blk; + + /* + * Next, write out the inode. + */ + pctx.errcode = ext2fs_write_new_inode(fs, ino, EXT2_INODE(&inode)); + if (pctx.errcode) { + pctx.str = "ext2fs_write_inode"; + fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx); + return 0; + } + + /* + * Now let's create the actual data block for the inode. + * Due to metadata_csum, the directory block MUST be written + * after the inode is written to disk! + */ + retval = ext2fs_new_dir_block(fs, ino, EXT2_ROOT_INO, &block); + if (retval) { + pctx.errcode = retval; + fix_problem(ctx, PR_3_ERR_LPF_NEW_DIR_BLOCK, &pctx); + return 0; + } + + retval = ext2fs_write_dir_block4(fs, blk, block, 0, ino); + ext2fs_free_mem(&block); + if (retval) { + pctx.errcode = retval; + fix_problem(ctx, PR_3_ERR_LPF_WRITE_BLOCK, &pctx); + return 0; + } + + /* + * Finally, create the directory link + */ + pctx.errcode = ext2fs_link(fs, EXT2_ROOT_INO, name, ino, EXT2_FT_DIR); + if (pctx.errcode == EXT2_ET_DIR_NO_SPACE) { + pctx.errcode = ext2fs_expand_dir(fs, EXT2_ROOT_INO); + if (pctx.errcode) + goto link_error; + pctx.errcode = ext2fs_link(fs, EXT2_ROOT_INO, name, ino, + EXT2_FT_DIR); + } + if (pctx.errcode) { +link_error: + pctx.str = "ext2fs_link"; + fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx); + return 0; + } + + /* + * Miscellaneous bookkeeping that needs to be kept straight. + */ + e2fsck_add_dir_info(ctx, ino, EXT2_ROOT_INO); + e2fsck_adjust_inode_count(ctx, EXT2_ROOT_INO, 1); + ext2fs_icount_store(ctx->inode_count, ino, 2); + ext2fs_icount_store(ctx->inode_link_info, ino, 2); + ctx->lost_and_found = ino; + quota_data_add(ctx->qctx, &inode, ino, EXT2_CLUSTER_SIZE(fs->super)); + quota_data_inodes(ctx->qctx, &inode, ino, +1); +#if 0 + printf("/lost+found created; inode #%lu\n", ino); +#endif + return ino; +} + +/* + * This routine will connect a file to lost+found + */ +int e2fsck_reconnect_file(e2fsck_t ctx, ext2_ino_t ino) +{ + ext2_filsys fs = ctx->fs; + errcode_t retval; + char name[80]; + struct problem_context pctx; + struct ext2_inode inode; + int file_type = 0; + + clear_problem_context(&pctx); + pctx.ino = ino; + + if (!ctx->bad_lost_and_found && !ctx->lost_and_found) { + if (e2fsck_get_lost_and_found(ctx, 1) == 0) + ctx->bad_lost_and_found++; + } + if (ctx->bad_lost_and_found) { + fix_problem(ctx, PR_3_NO_LPF, &pctx); + return 1; + } + + sprintf(name, "#%u", ino); + if (ext2fs_read_inode(fs, ino, &inode) == 0) + file_type = ext2_file_type(inode.i_mode); + retval = ext2fs_link(fs, ctx->lost_and_found, name, ino, file_type); + if (retval == EXT2_ET_DIR_NO_SPACE) { + if (!fix_problem(ctx, PR_3_EXPAND_LF_DIR, &pctx)) + return 1; + retval = e2fsck_expand_directory(ctx, ctx->lost_and_found, + 1, 0); + if (retval) { + pctx.errcode = retval; + fix_problem(ctx, PR_3_CANT_EXPAND_LPF, &pctx); + return 1; + } + retval = ext2fs_link(fs, ctx->lost_and_found, name, + ino, file_type); + } + if (retval) { + pctx.errcode = retval; + fix_problem(ctx, PR_3_CANT_RECONNECT, &pctx); + return 1; + } + e2fsck_adjust_inode_count(ctx, ino, 1); + + return 0; +} + +/* + * Utility routine to adjust the inode counts on an inode. + */ +errcode_t e2fsck_adjust_inode_count(e2fsck_t ctx, ext2_ino_t ino, int adj) +{ + ext2_filsys fs = ctx->fs; + errcode_t retval; + struct ext2_inode inode; + + if (!ino) + return 0; + + retval = ext2fs_read_inode(fs, ino, &inode); + if (retval) + return retval; + +#if 0 + printf("Adjusting link count for inode %lu by %d (from %d)\n", ino, adj, + inode.i_links_count); +#endif + + if (adj == 1) { + ext2fs_icount_increment(ctx->inode_count, ino, 0); + if (inode.i_links_count == (__u16) ~0) + return 0; + ext2fs_icount_increment(ctx->inode_link_info, ino, 0); + inode.i_links_count++; + } else if (adj == -1) { + ext2fs_icount_decrement(ctx->inode_count, ino, 0); + if (inode.i_links_count == 0) + return 0; + ext2fs_icount_decrement(ctx->inode_link_info, ino, 0); + inode.i_links_count--; + } + + retval = ext2fs_write_inode(fs, ino, &inode); + if (retval) + return retval; + + return 0; +} + +/* + * Fix parent --- this routine fixes up the parent of a directory. + */ +struct fix_dotdot_struct { + ext2_filsys fs; + ext2_ino_t parent; + int done; + e2fsck_t ctx; +}; + +static int fix_dotdot_proc(struct ext2_dir_entry *dirent, + int offset EXT2FS_ATTR((unused)), + int blocksize EXT2FS_ATTR((unused)), + char *buf EXT2FS_ATTR((unused)), + void *priv_data) +{ + struct fix_dotdot_struct *fp = (struct fix_dotdot_struct *) priv_data; + errcode_t retval; + struct problem_context pctx; + + if (ext2fs_dirent_name_len(dirent) != 2) + return 0; + if (strncmp(dirent->name, "..", 2)) + return 0; + + clear_problem_context(&pctx); + + retval = e2fsck_adjust_inode_count(fp->ctx, dirent->inode, -1); + if (retval) { + pctx.errcode = retval; + fix_problem(fp->ctx, PR_3_ADJUST_INODE, &pctx); + } + retval = e2fsck_adjust_inode_count(fp->ctx, fp->parent, 1); + if (retval) { + pctx.errcode = retval; + fix_problem(fp->ctx, PR_3_ADJUST_INODE, &pctx); + } + dirent->inode = fp->parent; + if (ext2fs_has_feature_filetype(fp->ctx->fs->super)) + ext2fs_dirent_set_file_type(dirent, EXT2_FT_DIR); + else + ext2fs_dirent_set_file_type(dirent, EXT2_FT_UNKNOWN); + + fp->done++; + return DIRENT_ABORT | DIRENT_CHANGED; +} + +static void fix_dotdot(e2fsck_t ctx, ext2_ino_t ino, ext2_ino_t parent) +{ + ext2_filsys fs = ctx->fs; + errcode_t retval; + struct fix_dotdot_struct fp; + struct problem_context pctx; + int flags, will_rehash; + + fp.fs = fs; + fp.parent = parent; + fp.done = 0; + fp.ctx = ctx; + +#if 0 + printf("Fixing '..' of inode %lu to be %lu...\n", ino, parent); +#endif + + clear_problem_context(&pctx); + pctx.ino = ino; + will_rehash = e2fsck_dir_will_be_rehashed(ctx, ino); + if (will_rehash) { + flags = ctx->fs->flags; + ctx->fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS; + } + retval = ext2fs_dir_iterate(fs, ino, DIRENT_FLAG_INCLUDE_EMPTY, + 0, fix_dotdot_proc, &fp); + if (will_rehash) + ctx->fs->flags = (flags & EXT2_FLAG_IGNORE_CSUM_ERRORS) | + (ctx->fs->flags & ~EXT2_FLAG_IGNORE_CSUM_ERRORS); + if (retval || !fp.done) { + pctx.errcode = retval; + fix_problem(ctx, retval ? PR_3_FIX_PARENT_ERR : + PR_3_FIX_PARENT_NOFIND, &pctx); + ext2fs_unmark_valid(fs); + } + (void) e2fsck_dir_info_set_dotdot(ctx, ino, parent); + if (e2fsck_dir_info_set_parent(ctx, ino, ctx->lost_and_found)) + fix_problem(ctx, PR_3_NO_DIRINFO, &pctx); + + return; +} + +/* + * These routines are responsible for expanding a /lost+found if it is + * too small. + */ + +struct expand_dir_struct { + blk64_t num; + e2_blkcnt_t guaranteed_size; + blk64_t newblocks; + blk64_t last_block; + errcode_t err; + e2fsck_t ctx; + ext2_ino_t dir; +}; + +static int expand_dir_proc(ext2_filsys fs, + blk64_t *blocknr, + e2_blkcnt_t blockcnt, + blk64_t ref_block EXT2FS_ATTR((unused)), + int ref_offset EXT2FS_ATTR((unused)), + void *priv_data) +{ + struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data; + blk64_t new_blk; + static blk64_t last_blk = 0; + char *block; + errcode_t retval; + e2fsck_t ctx; + + ctx = es->ctx; + + if (es->guaranteed_size && blockcnt >= es->guaranteed_size) + return BLOCK_ABORT; + + if (blockcnt > 0) + es->last_block = blockcnt; + if (*blocknr) { + last_blk = *blocknr; + return 0; + } + + if (blockcnt && + (EXT2FS_B2C(fs, last_blk) == EXT2FS_B2C(fs, last_blk + 1))) + new_blk = last_blk + 1; + else { + last_blk &= ~EXT2FS_CLUSTER_MASK(fs); + retval = ext2fs_new_block2(fs, last_blk, ctx->block_found_map, + &new_blk); + if (retval) { + es->err = retval; + return BLOCK_ABORT; + } + es->newblocks++; + ext2fs_block_alloc_stats2(fs, new_blk, +1); + } + last_blk = new_blk; + + if (blockcnt > 0) { + retval = ext2fs_new_dir_block(fs, 0, 0, &block); + if (retval) { + es->err = retval; + return BLOCK_ABORT; + } + es->num--; + retval = ext2fs_write_dir_block4(fs, new_blk, block, 0, + es->dir); + ext2fs_free_mem(&block); + } else + retval = ext2fs_zero_blocks2(fs, new_blk, 1, NULL, NULL); + if (retval) { + es->err = retval; + return BLOCK_ABORT; + } + *blocknr = new_blk; + ext2fs_mark_block_bitmap2(ctx->block_found_map, new_blk); + + if (es->num == 0) + return (BLOCK_CHANGED | BLOCK_ABORT); + else + return BLOCK_CHANGED; +} + +errcode_t e2fsck_expand_directory(e2fsck_t ctx, ext2_ino_t dir, + int num, int guaranteed_size) +{ + ext2_filsys fs = ctx->fs; + errcode_t retval; + struct expand_dir_struct es; + struct ext2_inode_large inode; + blk64_t sz; + + if (!(fs->flags & EXT2_FLAG_RW)) + return EXT2_ET_RO_FILSYS; + + /* + * Read the inode and block bitmaps in; we'll be messing with + * them. + */ + e2fsck_read_bitmaps(ctx); + + retval = ext2fs_check_directory(fs, dir); + if (retval) + return retval; + + es.num = num; + es.guaranteed_size = guaranteed_size; + es.last_block = 0; + es.err = 0; + es.newblocks = 0; + es.ctx = ctx; + es.dir = dir; + + retval = ext2fs_block_iterate3(fs, dir, BLOCK_FLAG_APPEND, + 0, expand_dir_proc, &es); + + if (es.err) + return es.err; + + /* + * Update the size and block count fields in the inode. + */ + retval = ext2fs_read_inode_full(fs, dir, + EXT2_INODE(&inode), sizeof(inode)); + if (retval) + return retval; + + sz = (es.last_block + 1) * fs->blocksize; + retval = ext2fs_inode_size_set(fs, EXT2_INODE(&inode), sz); + if (retval) + return retval; + ext2fs_iblk_add_blocks(fs, EXT2_INODE(&inode), es.newblocks); + quota_data_add(ctx->qctx, &inode, dir, + es.newblocks * EXT2_CLUSTER_SIZE(fs->super)); + + e2fsck_write_inode_full(ctx, dir, EXT2_INODE(&inode), + sizeof(inode), "expand_directory"); + + return 0; +} + |