diff options
Diffstat (limited to 'e2fsck/dx_dirinfo.c')
| -rw-r--r-- | e2fsck/dx_dirinfo.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/e2fsck/dx_dirinfo.c b/e2fsck/dx_dirinfo.c new file mode 100644 index 0000000..4b764b0 --- /dev/null +++ b/e2fsck/dx_dirinfo.c @@ -0,0 +1,154 @@ +/* + * dirinfo.c --- maintains the directory information table for e2fsck. + * + * Copyright (C) 1993 Theodore Ts'o. This file may be redistributed + * under the terms of the GNU Public License. + */ + +#include "config.h" +#include "e2fsck.h" + +/* + * This subroutine is called during pass1 to create a directory info + * entry. During pass1, the passed-in parent is 0; it will get filled + * in during pass2. + */ +void e2fsck_add_dx_dir(e2fsck_t ctx, ext2_ino_t ino, struct ext2_inode *inode, + int num_blocks) +{ + struct dx_dir_info *dir; + ext2_ino_t i, j; + errcode_t retval; + unsigned long old_size; + +#if 0 + printf("add_dx_dir_info for inode %lu...\n", ino); +#endif + if (!ctx->dx_dir_info) { + ctx->dx_dir_info_count = 0; + ctx->dx_dir_info_size = 100; /* Guess */ + ctx->dx_dir_info = (struct dx_dir_info *) + e2fsck_allocate_memory(ctx, ctx->dx_dir_info_size + * sizeof (struct dx_dir_info), + "directory map"); + } + + if (ctx->dx_dir_info_count >= ctx->dx_dir_info_size) { + old_size = ctx->dx_dir_info_size * sizeof(struct dx_dir_info); + ctx->dx_dir_info_size += 10; + retval = ext2fs_resize_mem(old_size, ctx->dx_dir_info_size * + sizeof(struct dx_dir_info), + &ctx->dx_dir_info); + if (retval) { + fprintf(stderr, "Couldn't reallocate dx_dir_info " + "structure to %u entries\n", + ctx->dx_dir_info_size); + fatal_error(ctx, 0); + ctx->dx_dir_info_size -= 10; + return; + } + } + + /* + * Normally, add_dx_dir_info is called with each inode in + * sequential order; but once in a while (like when pass 3 + * needs to recreate the root directory or lost+found + * directory) it is called out of order. In those cases, we + * need to move the dx_dir_info entries down to make room, since + * the dx_dir_info array needs to be sorted by inode number for + * get_dx_dir_info()'s sake. + */ + if (ctx->dx_dir_info_count && + ctx->dx_dir_info[ctx->dx_dir_info_count-1].ino >= ino) { + for (i = ctx->dx_dir_info_count-1; i > 0; i--) + if (ctx->dx_dir_info[i-1].ino < ino) + break; + dir = &ctx->dx_dir_info[i]; + if (dir->ino != ino) + for (j = ctx->dx_dir_info_count++; j > i; j--) + ctx->dx_dir_info[j] = ctx->dx_dir_info[j-1]; + } else + dir = &ctx->dx_dir_info[ctx->dx_dir_info_count++]; + + dir->ino = ino; + dir->numblocks = num_blocks; + dir->hashversion = 0; + dir->casefolded_hash = !!(inode->i_flags & EXT4_CASEFOLD_FL); + dir->dx_block = e2fsck_allocate_memory(ctx, num_blocks + * sizeof (struct dx_dirblock_info), + "dx_block info array"); +} + +/* + * get_dx_dir_info() --- given an inode number, try to find the directory + * information entry for it. + */ +struct dx_dir_info *e2fsck_get_dx_dir_info(e2fsck_t ctx, ext2_ino_t ino) +{ + ext2_ino_t low, high, mid; + + low = 0; + high = ctx->dx_dir_info_count-1; + if (!ctx->dx_dir_info) + return 0; + if (ino == ctx->dx_dir_info[low].ino) + return &ctx->dx_dir_info[low]; + if (ino == ctx->dx_dir_info[high].ino) + return &ctx->dx_dir_info[high]; + + while (low < high) { + /* sum may overflow, but result will fit into mid again */ + mid = (unsigned long long)(low + high) / 2; + if (mid == low || mid == high) + break; + if (ino == ctx->dx_dir_info[mid].ino) + return &ctx->dx_dir_info[mid]; + if (ino < ctx->dx_dir_info[mid].ino) + high = mid; + else + low = mid; + } + return 0; +} + +/* + * Free the dx_dir_info structure when it isn't needed any more. + */ +void e2fsck_free_dx_dir_info(e2fsck_t ctx) +{ + struct dx_dir_info *dir; + ext2_ino_t i; + + if (ctx->dx_dir_info) { + dir = ctx->dx_dir_info; + for (i=0; i < ctx->dx_dir_info_count; i++,dir++) { + if (dir->dx_block) { + ext2fs_free_mem(&dir->dx_block); + dir->dx_block = 0; + } + } + ext2fs_free_mem(&ctx->dx_dir_info); + ctx->dx_dir_info = 0; + } + ctx->dx_dir_info_size = 0; + ctx->dx_dir_info_count = 0; +} + +/* + * Return the count of number of directories in the dx_dir_info structure + */ +ext2_ino_t e2fsck_get_num_dx_dirinfo(e2fsck_t ctx) +{ + return ctx->dx_dir_info_count; +} + +/* + * A simple iterator function + */ +struct dx_dir_info *e2fsck_dx_dir_info_iter(e2fsck_t ctx, ext2_ino_t *control) +{ + if (*control >= ctx->dx_dir_info_count) + return 0; + + return ctx->dx_dir_info + (*control)++; +} |