aboutsummaryrefslogtreecommitdiffstats
path: root/e2fsck/dx_dirinfo.c
diff options
context:
space:
mode:
Diffstat (limited to 'e2fsck/dx_dirinfo.c')
-rw-r--r--e2fsck/dx_dirinfo.c150
1 files changed, 150 insertions, 0 deletions
diff --git a/e2fsck/dx_dirinfo.c b/e2fsck/dx_dirinfo.c
new file mode 100644
index 00000000..ff90e99f
--- /dev/null
+++ b/e2fsck/dx_dirinfo.c
@@ -0,0 +1,150 @@
+/*
+ * 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 "e2fsck.h"
+#ifdef ENABLE_HTREE
+
+/*
+ * 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, int num_blocks)
+{
+ struct dx_dir_info *dir;
+ int 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),
+ (void **) &ctx->dx_dir_info);
+ if (retval) {
+ 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->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)
+{
+ int 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) {
+ mid = (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)
+{
+ int i;
+ struct dx_dir_info *dir;
+
+ if (ctx->dx_dir_info) {
+ dir = ctx->dx_dir_info;
+ for (i=0; i < ctx->dx_dir_info_count; i++) {
+ if (dir->dx_block) {
+ ext2fs_free_mem((void **) &dir->dx_block);
+ dir->dx_block = 0;
+ }
+ }
+ ext2fs_free_mem((void **) &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
+ */
+int e2fsck_get_num_dx_dirinfo(e2fsck_t ctx)
+{
+ return ctx->dx_dir_info_count;
+}
+
+/*
+ * A simple interator function
+ */
+struct dx_dir_info *e2fsck_dx_dir_info_iter(e2fsck_t ctx, int *control)
+{
+ if (*control >= ctx->dx_dir_info_count)
+ return 0;
+
+ return(ctx->dx_dir_info + (*control)++);
+}
+
+#endif /* ENABLE_HTREE */