summaryrefslogtreecommitdiffstats
path: root/e2fsck/rehash.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--e2fsck/rehash.c1189
1 files changed, 1189 insertions, 0 deletions
diff --git a/e2fsck/rehash.c b/e2fsck/rehash.c
new file mode 100644
index 0000000..c1da7d5
--- /dev/null
+++ b/e2fsck/rehash.c
@@ -0,0 +1,1189 @@
+/*
+ * rehash.c --- rebuild hash tree directories
+ *
+ * Copyright (C) 2002 Theodore Ts'o
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ *
+ * This algorithm is designed for simplicity of implementation and to
+ * pack the directory as much as possible. It however requires twice
+ * as much memory as the size of the directory. The maximum size
+ * directory supported using a 4k blocksize is roughly a gigabyte, and
+ * so there may very well be problems with machines that don't have
+ * virtual memory, and obscenely large directories.
+ *
+ * An alternate algorithm which is much more disk intensive could be
+ * written, and probably will need to be written in the future. The
+ * design goals of such an algorithm are: (a) use (roughly) constant
+ * amounts of memory, no matter how large the directory, (b) the
+ * directory must be safe at all times, even if e2fsck is interrupted
+ * in the middle, (c) we must use minimal amounts of extra disk
+ * blocks. This pretty much requires an incremental approach, where
+ * we are reading from one part of the directory, and inserting into
+ * the front half. So the algorithm will have to keep track of a
+ * moving block boundary between the new tree and the old tree, and
+ * files will need to be moved from the old directory and inserted
+ * into the new tree. If the new directory requires space which isn't
+ * yet available, blocks from the beginning part of the old directory
+ * may need to be moved to the end of the directory to make room for
+ * the new tree:
+ *
+ * --------------------------------------------------------
+ * | new tree | | old tree |
+ * --------------------------------------------------------
+ * ^ ptr ^ptr
+ * tail new head old
+ *
+ * This is going to be a pain in the tuckus to implement, and will
+ * require a lot more disk accesses. So I'm going to skip it for now;
+ * it's only really going to be an issue for really, really big
+ * filesystems (when we reach the level of tens of millions of files
+ * in a single directory). It will probably be easier to simply
+ * require that e2fsck use VM first.
+ */
+
+#include "config.h"
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+#include "e2fsck.h"
+#include "problem.h"
+#include "support/sort_r.h"
+
+/* Schedule a dir to be rebuilt during pass 3A. */
+void e2fsck_rehash_dir_later(e2fsck_t ctx, ext2_ino_t ino)
+{
+ if (!ctx->dirs_to_hash)
+ ext2fs_u32_list_create(&ctx->dirs_to_hash, 50);
+ if (ctx->dirs_to_hash)
+ ext2fs_u32_list_add(ctx->dirs_to_hash, ino);
+}
+
+/* Ask if a dir will be rebuilt during pass 3A. */
+int e2fsck_dir_will_be_rehashed(e2fsck_t ctx, ext2_ino_t ino)
+{
+ if (ctx->options & E2F_OPT_COMPRESS_DIRS)
+ return 1;
+ if (!ctx->dirs_to_hash)
+ return 0;
+ return ext2fs_u32_list_test(ctx->dirs_to_hash, ino);
+}
+
+#undef REHASH_DEBUG
+
+struct fill_dir_struct {
+ char *buf;
+ struct ext2_inode *inode;
+ ext2_ino_t ino;
+ errcode_t err;
+ e2fsck_t ctx;
+ struct hash_entry *harray;
+ blk_t max_array, num_array;
+ ext2_off64_t dir_size;
+ int compress;
+ ext2_ino_t parent;
+ ext2_ino_t dir;
+};
+
+struct hash_entry {
+ ext2_dirhash_t hash;
+ ext2_dirhash_t minor_hash;
+ ext2_ino_t ino;
+ struct ext2_dir_entry *dir;
+};
+
+struct out_dir {
+ blk_t num;
+ blk_t max;
+ char *buf;
+ ext2_dirhash_t *hashes;
+};
+
+#define DOTDOT_OFFSET 12
+
+static int is_fake_entry(ext2_filsys fs, int lblk, unsigned int offset)
+{
+ /* Entries in the first block before this value refer to . or .. */
+ if (lblk == 0 && offset <= DOTDOT_OFFSET)
+ return 1;
+ /* Check if this is likely the csum entry */
+ if (ext2fs_has_feature_metadata_csum(fs->super) &&
+ (offset & (fs->blocksize - 1)) ==
+ fs->blocksize - sizeof(struct ext2_dir_entry_tail))
+ return 1;
+ return 0;
+}
+
+static int fill_dir_block(ext2_filsys fs,
+ blk64_t *block_nr,
+ e2_blkcnt_t blockcnt,
+ blk64_t ref_block EXT2FS_ATTR((unused)),
+ int ref_offset EXT2FS_ATTR((unused)),
+ void *priv_data)
+{
+ struct fill_dir_struct *fd = (struct fill_dir_struct *) priv_data;
+ struct hash_entry *ent;
+ struct ext2_dir_entry *dirent;
+ char *dir;
+ unsigned int offset, dir_offset, rec_len, name_len;
+ int hash_alg, hash_flags, hash_in_entry;
+
+ if (blockcnt < 0)
+ return 0;
+
+ offset = blockcnt * fs->blocksize;
+ if (offset + fs->blocksize > fd->inode->i_size) {
+ fd->err = EXT2_ET_DIR_CORRUPTED;
+ return BLOCK_ABORT;
+ }
+
+ dir = (fd->buf+offset);
+ if (*block_nr == 0) {
+ memset(dir, 0, fs->blocksize);
+ dirent = (struct ext2_dir_entry *) dir;
+ (void) ext2fs_set_rec_len(fs, fs->blocksize, dirent);
+ } else {
+ int flags = fs->flags;
+ fs->flags |= EXT2_FLAG_IGNORE_CSUM_ERRORS;
+ fd->err = ext2fs_read_dir_block4(fs, *block_nr, dir, 0,
+ fd->dir);
+ fs->flags = (flags & EXT2_FLAG_IGNORE_CSUM_ERRORS) |
+ (fs->flags & ~EXT2_FLAG_IGNORE_CSUM_ERRORS);
+ if (fd->err)
+ return BLOCK_ABORT;
+ }
+ hash_flags = fd->inode->i_flags & EXT4_CASEFOLD_FL;
+ hash_in_entry = ext4_hash_in_dirent(fd->inode);
+ hash_alg = fs->super->s_def_hash_version;
+ if ((hash_alg <= EXT2_HASH_TEA) &&
+ (fs->super->s_flags & EXT2_FLAGS_UNSIGNED_HASH))
+ hash_alg += 3;
+ /* While the directory block is "hot", index it. */
+ dir_offset = 0;
+ while (dir_offset < fs->blocksize) {
+ unsigned int min_rec = EXT2_DIR_ENTRY_HEADER_LEN;
+ int extended = hash_in_entry && !is_fake_entry(fs, blockcnt, dir_offset);
+
+ if (extended)
+ min_rec += EXT2_DIR_ENTRY_HASH_LEN;
+ dirent = (struct ext2_dir_entry *) (dir + dir_offset);
+ (void) ext2fs_get_rec_len(fs, dirent, &rec_len);
+ name_len = ext2fs_dirent_name_len(dirent);
+ if (((dir_offset + rec_len) > fs->blocksize) ||
+ (rec_len < min_rec) ||
+ ((rec_len % 4) != 0) ||
+ (name_len + min_rec > rec_len)) {
+ fd->err = EXT2_ET_DIR_CORRUPTED;
+ return BLOCK_ABORT;
+ }
+ dir_offset += rec_len;
+ if (dirent->inode == 0)
+ continue;
+ if ((name_len) == 0) {
+ fd->err = EXT2_ET_DIR_CORRUPTED;
+ return BLOCK_ABORT;
+ }
+ if (!fd->compress && (name_len == 1) &&
+ (dirent->name[0] == '.'))
+ continue;
+ if (!fd->compress && (name_len == 2) &&
+ (dirent->name[0] == '.') && (dirent->name[1] == '.')) {
+ fd->parent = dirent->inode;
+ continue;
+ }
+ if (fd->num_array >= fd->max_array) {
+ errcode_t retval;
+
+ retval = ext2fs_resize_array(sizeof(struct hash_entry),
+ fd->max_array,
+ fd->max_array + 500,
+ &fd->harray);
+ if (retval) {
+ fd->err = retval;
+ return BLOCK_ABORT;
+ }
+ fd->max_array += 500;
+ }
+ ent = fd->harray + fd->num_array++;
+ ent->dir = dirent;
+ fd->dir_size += ext2fs_dir_rec_len(name_len, extended);
+ ent->ino = dirent->inode;
+ if (extended) {
+ ent->hash = EXT2_DIRENT_HASH(dirent);
+ ent->minor_hash = EXT2_DIRENT_MINOR_HASH(dirent);
+ } else if (fd->compress) {
+ ent->hash = ent->minor_hash = 0;
+ } else {
+ fd->err = ext2fs_dirhash2(hash_alg,
+ dirent->name, name_len,
+ fs->encoding, hash_flags,
+ fs->super->s_hash_seed,
+ &ent->hash, &ent->minor_hash);
+ if (fd->err)
+ return BLOCK_ABORT;
+ }
+ }
+
+ return 0;
+}
+
+/* Used for sorting the hash entry */
+static EXT2_QSORT_TYPE ino_cmp(const void *a, const void *b)
+{
+ const struct hash_entry *he_a = (const struct hash_entry *) a;
+ const struct hash_entry *he_b = (const struct hash_entry *) b;
+
+ return (he_a->ino - he_b->ino);
+}
+
+struct name_cmp_ctx
+{
+ int casefold;
+ const struct ext2fs_nls_table *tbl;
+};
+
+static int same_name(const struct name_cmp_ctx *cmp_ctx, char *s1,
+ int len1, char *s2, int len2)
+{
+ if (!cmp_ctx->casefold)
+ return (len1 == len2 && !memcmp(s1, s2, len1));
+ else
+ return !ext2fs_casefold_cmp(cmp_ctx->tbl,
+ (unsigned char *) s1, len1,
+ (unsigned char *) s2, len2);
+}
+
+/* Used for sorting the hash entry */
+static EXT2_QSORT_TYPE name_cmp(const void *a, const void *b)
+{
+ const struct hash_entry *he_a = (const struct hash_entry *) a;
+ const struct hash_entry *he_b = (const struct hash_entry *) b;
+ unsigned int he_a_len, he_b_len, min_len;
+ int ret;
+
+ he_a_len = ext2fs_dirent_name_len(he_a->dir);
+ he_b_len = ext2fs_dirent_name_len(he_b->dir);
+ min_len = he_a_len;
+ if (min_len > he_b_len)
+ min_len = he_b_len;
+
+ ret = memcmp(he_a->dir->name, he_b->dir->name, min_len);
+ if (ret == 0) {
+ if (he_a_len > he_b_len)
+ ret = 1;
+ else if (he_a_len < he_b_len)
+ ret = -1;
+ else
+ ret = he_b->dir->inode - he_a->dir->inode;
+ }
+ return ret;
+}
+
+static EXT2_QSORT_TYPE name_cf_cmp(const struct name_cmp_ctx *ctx,
+ const void *a, const void *b)
+{
+ const struct hash_entry *he_a = (const struct hash_entry *) a;
+ const struct hash_entry *he_b = (const struct hash_entry *) b;
+ unsigned int he_a_len, he_b_len;
+ int ret;
+
+ he_a_len = ext2fs_dirent_name_len(he_a->dir);
+ he_b_len = ext2fs_dirent_name_len(he_b->dir);
+
+ ret = ext2fs_casefold_cmp(ctx->tbl,
+ (unsigned char *) he_a->dir->name, he_a_len,
+ (unsigned char *) he_b->dir->name, he_b_len);
+ if (ret == 0) {
+ if (he_a_len > he_b_len)
+ ret = 1;
+ else if (he_a_len < he_b_len)
+ ret = -1;
+ else
+ ret = he_b->dir->inode - he_a->dir->inode;
+ }
+ return ret;
+}
+
+/* Used for sorting the hash entry */
+static EXT2_QSORT_TYPE hash_cmp(const void *a, const void *b, void *arg)
+{
+ const struct name_cmp_ctx *ctx = (struct name_cmp_ctx *) arg;
+ const struct hash_entry *he_a = (const struct hash_entry *) a;
+ const struct hash_entry *he_b = (const struct hash_entry *) b;
+ int ret;
+
+ if (he_a->hash > he_b->hash)
+ ret = 1;
+ else if (he_a->hash < he_b->hash)
+ ret = -1;
+ else {
+ if (he_a->minor_hash > he_b->minor_hash)
+ ret = 1;
+ else if (he_a->minor_hash < he_b->minor_hash)
+ ret = -1;
+ else {
+ if (ctx->casefold)
+ ret = name_cf_cmp(ctx, a, b);
+ else
+ ret = name_cmp(a, b);
+ }
+ }
+ return ret;
+}
+
+static errcode_t alloc_size_dir(ext2_filsys fs, struct out_dir *outdir,
+ blk_t blocks)
+{
+ errcode_t retval;
+
+ if (outdir->max) {
+ retval = ext2fs_resize_array(fs->blocksize, outdir->max, blocks,
+ &outdir->buf);
+ if (retval)
+ return retval;
+ retval = ext2fs_resize_array(sizeof(ext2_dirhash_t),
+ outdir->max, blocks,
+ &outdir->hashes);
+ if (retval)
+ return retval;
+ } else {
+ retval = ext2fs_get_array(fs->blocksize, blocks, &outdir->buf);
+ if (retval)
+ return retval;
+ retval = ext2fs_get_array(sizeof(ext2_dirhash_t), blocks,
+ &outdir->hashes);
+ if (retval)
+ return retval;
+ outdir->num = 0;
+ }
+ outdir->max = blocks;
+ return 0;
+}
+
+static void free_out_dir(struct out_dir *outdir)
+{
+ free(outdir->buf);
+ free(outdir->hashes);
+ outdir->max = 0;
+ outdir->num =0;
+}
+
+static errcode_t get_next_block(ext2_filsys fs, struct out_dir *outdir,
+ char ** ret)
+{
+ errcode_t retval;
+
+ if (outdir->num >= outdir->max) {
+ int increment = outdir->max / 10;
+
+ if (increment < 50)
+ increment = 50;
+ retval = alloc_size_dir(fs, outdir, outdir->max + increment);
+ if (retval)
+ return retval;
+ }
+ *ret = outdir->buf + (size_t)outdir->num++ * fs->blocksize;
+ memset(*ret, 0, fs->blocksize);
+ return 0;
+}
+
+/*
+ * This function is used to make a unique filename. We do this by
+ * appending ~0, and then incrementing the number. However, we cannot
+ * expand the length of the filename beyond the padding available in
+ * the directory entry.
+ */
+static void mutate_name(char *str, unsigned int *len)
+{
+ int i;
+ unsigned int l = *len;
+
+ /*
+ * First check to see if it looks the name has been mutated
+ * already
+ */
+ for (i = l-1; i > 0; i--) {
+ if (!isdigit(str[i]))
+ break;
+ }
+ if ((i == (int)l - 1) || (str[i] != '~')) {
+ if (((l-1) & 3) < 2)
+ l += 2;
+ else
+ l = (l+3) & ~3;
+ if (l > 255)
+ l = 255;
+ str[l-2] = '~';
+ str[l-1] = '0';
+ *len = l;
+ return;
+ }
+ for (i = l-1; i >= 0; i--) {
+ if (isdigit(str[i])) {
+ if (str[i] == '9')
+ str[i] = '0';
+ else {
+ str[i]++;
+ return;
+ }
+ continue;
+ }
+ if (i == 1) {
+ if (str[0] == 'z')
+ str[0] = 'A';
+ else if (str[0] == 'Z') {
+ str[0] = '~';
+ str[1] = '0';
+ } else
+ str[0]++;
+ } else if (i > 0) {
+ str[i] = '1';
+ str[i-1] = '~';
+ } else {
+ if (str[0] == '~')
+ str[0] = 'a';
+ else
+ str[0]++;
+ }
+ break;
+ }
+}
+
+static int duplicate_search_and_fix(e2fsck_t ctx, ext2_filsys fs,
+ ext2_ino_t ino,
+ struct fill_dir_struct *fd,
+ const struct name_cmp_ctx *cmp_ctx)
+{
+ struct problem_context pctx;
+ struct hash_entry *ent, *prev;
+ blk_t i, j;
+ int fixed = 0;
+ char new_name[256];
+ unsigned int new_len;
+ int hash_alg;
+ int hash_flags = fd->inode->i_flags & EXT4_CASEFOLD_FL;
+
+ clear_problem_context(&pctx);
+ pctx.ino = ino;
+
+ hash_alg = fs->super->s_def_hash_version;
+ if ((hash_alg <= EXT2_HASH_TEA) &&
+ (fs->super->s_flags & EXT2_FLAGS_UNSIGNED_HASH))
+ hash_alg += 3;
+
+ for (i=1; i < fd->num_array; i++) {
+ ent = fd->harray + i;
+ prev = ent - 1;
+ if (!ent->dir->inode ||
+ !same_name(cmp_ctx, ent->dir->name,
+ ext2fs_dirent_name_len(ent->dir),
+ prev->dir->name,
+ ext2fs_dirent_name_len(prev->dir)))
+ continue;
+ pctx.dirent = ent->dir;
+ if ((ent->dir->inode == prev->dir->inode) &&
+ fix_problem(ctx, PR_2_DUPLICATE_DIRENT, &pctx)) {
+ e2fsck_adjust_inode_count(ctx, ent->dir->inode, -1);
+ ent->dir->inode = 0;
+ fixed++;
+ continue;
+ }
+ /* Can't alter encrypted name without key, so just drop it */
+ if (fd->inode->i_flags & EXT4_ENCRYPT_FL) {
+ if (fix_problem(ctx, PR_2_NON_UNIQUE_FILE_NO_RENAME, &pctx)) {
+ e2fsck_adjust_inode_count(ctx, ent->dir->inode, -1);
+ ent->dir->inode = 0;
+ fixed++;
+ continue;
+ }
+ }
+ new_len = ext2fs_dirent_name_len(ent->dir);
+ if (new_len == 0) {
+ /* should never happen */
+ ext2fs_unmark_valid(fs);
+ continue;
+ }
+ memcpy(new_name, ent->dir->name, new_len);
+ mutate_name(new_name, &new_len);
+ for (j=0; j < fd->num_array; j++) {
+ if ((i==j) ||
+ !same_name(cmp_ctx, new_name, new_len,
+ fd->harray[j].dir->name,
+ ext2fs_dirent_name_len(fd->harray[j].dir))) {
+ continue;
+ }
+ mutate_name(new_name, &new_len);
+
+ j = -1;
+ }
+ new_name[new_len] = 0;
+ pctx.str = new_name;
+ if (fix_problem(ctx, PR_2_NON_UNIQUE_FILE, &pctx)) {
+ memcpy(ent->dir->name, new_name, new_len);
+ ext2fs_dirent_set_name_len(ent->dir, new_len);
+ ext2fs_dirhash2(hash_alg, new_name, new_len,
+ fs->encoding, hash_flags,
+ fs->super->s_hash_seed,
+ &ent->hash, &ent->minor_hash);
+ fixed++;
+ }
+ }
+ return fixed;
+}
+
+
+static errcode_t copy_dir_entries(e2fsck_t ctx,
+ struct fill_dir_struct *fd,
+ struct out_dir *outdir)
+{
+ ext2_filsys fs = ctx->fs;
+ errcode_t retval;
+ char *block_start;
+ struct hash_entry *ent;
+ struct ext2_dir_entry *dirent;
+ unsigned int rec_len, prev_rec_len, left, slack, offset;
+ blk_t i;
+ ext2_dirhash_t prev_hash;
+ int csum_size = 0;
+ struct ext2_dir_entry_tail *t;
+ int hash_in_entry = ext4_hash_in_dirent(fd->inode);
+ unsigned int min_rec_len = ext2fs_dir_rec_len(1, hash_in_entry);
+
+ if (ctx->htree_slack_percentage == 255) {
+ profile_get_uint(ctx->profile, "options",
+ "indexed_dir_slack_percentage",
+ 0, 20,
+ &ctx->htree_slack_percentage);
+ if (ctx->htree_slack_percentage > 100)
+ ctx->htree_slack_percentage = 20;
+ }
+
+ if (ext2fs_has_feature_metadata_csum(fs->super))
+ csum_size = sizeof(struct ext2_dir_entry_tail);
+
+ outdir->max = 0;
+ retval = alloc_size_dir(fs, outdir,
+ (fd->dir_size / fs->blocksize) + 2);
+ if (retval)
+ return retval;
+ outdir->num = fd->compress ? 0 : 1;
+ offset = 0;
+ outdir->hashes[0] = 0;
+ prev_hash = 1;
+ if ((retval = get_next_block(fs, outdir, &block_start)))
+ return retval;
+ dirent = (struct ext2_dir_entry *) block_start;
+ prev_rec_len = 0;
+ rec_len = 0;
+ left = fs->blocksize - csum_size;
+ slack = fd->compress ? min_rec_len :
+ ((fs->blocksize - csum_size) * ctx->htree_slack_percentage)/100;
+ if (slack < min_rec_len)
+ slack = min_rec_len;
+ for (i = 0; i < fd->num_array; i++) {
+ ent = fd->harray + i;
+ if (ent->dir->inode == 0)
+ continue;
+ rec_len = ext2fs_dir_rec_len(ext2fs_dirent_name_len(ent->dir),
+ hash_in_entry);
+ if (rec_len > left) {
+ if (left) {
+ left += prev_rec_len;
+ retval = ext2fs_set_rec_len(fs, left, dirent);
+ if (retval)
+ return retval;
+ }
+ if (csum_size) {
+ t = EXT2_DIRENT_TAIL(block_start,
+ fs->blocksize);
+ ext2fs_initialize_dirent_tail(fs, t);
+ }
+ if ((retval = get_next_block(fs, outdir,
+ &block_start)))
+ return retval;
+ offset = 0;
+ }
+ left = (fs->blocksize - csum_size) - offset;
+ dirent = (struct ext2_dir_entry *) (block_start + offset);
+ if (offset == 0) {
+ if (ent->hash == prev_hash)
+ outdir->hashes[outdir->num-1] = ent->hash | 1;
+ else
+ outdir->hashes[outdir->num-1] = ent->hash;
+ }
+ dirent->inode = ent->dir->inode;
+ ext2fs_dirent_set_name_len(dirent,
+ ext2fs_dirent_name_len(ent->dir));
+ ext2fs_dirent_set_file_type(dirent,
+ ext2fs_dirent_file_type(ent->dir));
+ retval = ext2fs_set_rec_len(fs, rec_len, dirent);
+ if (retval)
+ return retval;
+ prev_rec_len = rec_len;
+ memcpy(dirent->name, ent->dir->name,
+ ext2fs_dirent_name_len(dirent));
+ if (hash_in_entry) {
+ EXT2_DIRENT_HASHES(dirent)->hash = ext2fs_cpu_to_le32(ent->hash);
+ EXT2_DIRENT_HASHES(dirent)->minor_hash =
+ ext2fs_cpu_to_le32(ent->minor_hash);
+ }
+ offset += rec_len;
+ left -= rec_len;
+ if (left < slack) {
+ prev_rec_len += left;
+ retval = ext2fs_set_rec_len(fs, prev_rec_len, dirent);
+ if (retval)
+ return retval;
+ offset += left;
+ left = 0;
+ }
+ prev_hash = ent->hash;
+ }
+ if (left)
+ retval = ext2fs_set_rec_len(fs, rec_len + left, dirent);
+ if (csum_size) {
+ t = EXT2_DIRENT_TAIL(block_start, fs->blocksize);
+ ext2fs_initialize_dirent_tail(fs, t);
+ }
+
+ return retval;
+}
+
+
+static struct ext2_dx_root_info *set_root_node(ext2_filsys fs, char *buf,
+ ext2_ino_t ino, ext2_ino_t parent,
+ struct ext2_inode *inode)
+{
+ struct ext2_dir_entry *dir;
+ struct ext2_dx_root_info *root;
+ struct ext2_dx_countlimit *limits;
+ int filetype = 0;
+ int csum_size = 0;
+
+ if (ext2fs_has_feature_filetype(fs->super))
+ filetype = EXT2_FT_DIR;
+
+ memset(buf, 0, fs->blocksize);
+ dir = (struct ext2_dir_entry *) buf;
+ dir->inode = ino;
+ dir->name[0] = '.';
+ ext2fs_dirent_set_name_len(dir, 1);
+ ext2fs_dirent_set_file_type(dir, filetype);
+ dir->rec_len = 12;
+ dir = (struct ext2_dir_entry *) (buf + 12);
+ dir->inode = parent;
+ dir->name[0] = '.';
+ dir->name[1] = '.';
+ ext2fs_dirent_set_name_len(dir, 2);
+ ext2fs_dirent_set_file_type(dir, filetype);
+ dir->rec_len = fs->blocksize - 12;
+
+ root = (struct ext2_dx_root_info *) (buf+24);
+ root->reserved_zero = 0;
+ if (ext4_hash_in_dirent(inode))
+ root->hash_version = EXT2_HASH_SIPHASH;
+ else
+ root->hash_version = fs->super->s_def_hash_version;
+ root->info_length = 8;
+ root->indirect_levels = 0;
+ root->unused_flags = 0;
+
+ if (ext2fs_has_feature_metadata_csum(fs->super))
+ csum_size = sizeof(struct ext2_dx_tail);
+
+ limits = (struct ext2_dx_countlimit *) (buf+32);
+ limits->limit = (fs->blocksize - (32 + csum_size)) /
+ sizeof(struct ext2_dx_entry);
+ limits->count = 0;
+
+ return root;
+}
+
+
+static struct ext2_dx_entry *set_int_node(ext2_filsys fs, char *buf)
+{
+ struct ext2_dir_entry *dir;
+ struct ext2_dx_countlimit *limits;
+ int csum_size = 0;
+
+ memset(buf, 0, fs->blocksize);
+ dir = (struct ext2_dir_entry *) buf;
+ dir->inode = 0;
+ (void) ext2fs_set_rec_len(fs, fs->blocksize, dir);
+
+ if (ext2fs_has_feature_metadata_csum(fs->super))
+ csum_size = sizeof(struct ext2_dx_tail);
+
+ limits = (struct ext2_dx_countlimit *) (buf+8);
+ limits->limit = (fs->blocksize - (8 + csum_size)) /
+ sizeof(struct ext2_dx_entry);
+ limits->count = 0;
+
+ return (struct ext2_dx_entry *) limits;
+}
+
+static int alloc_blocks(ext2_filsys fs,
+ struct ext2_dx_countlimit **limit,
+ struct ext2_dx_entry **prev_ent,
+ struct ext2_dx_entry **next_ent,
+ int *prev_offset, int *next_offset,
+ struct out_dir *outdir, int i,
+ int *prev_count, int *next_count)
+{
+ errcode_t retval;
+ char *block_start;
+
+ if (*limit)
+ (*limit)->limit = (*limit)->count =
+ ext2fs_cpu_to_le16((*limit)->limit);
+ *prev_ent = (struct ext2_dx_entry *) (outdir->buf + *prev_offset);
+ (*prev_ent)->block = ext2fs_cpu_to_le32(outdir->num);
+
+ if (i != 1)
+ (*prev_ent)->hash =
+ ext2fs_cpu_to_le32(outdir->hashes[i]);
+
+ retval = get_next_block(fs, outdir, &block_start);
+ if (retval)
+ return retval;
+
+ /* outdir->buf might be reallocated */
+ *prev_ent = (struct ext2_dx_entry *) (outdir->buf + *prev_offset);
+
+ *next_ent = set_int_node(fs, block_start);
+ *limit = (struct ext2_dx_countlimit *)(*next_ent);
+ if (next_offset)
+ *next_offset = ((char *) *next_ent - outdir->buf);
+
+ *next_count = (*limit)->limit;
+ (*prev_offset) += sizeof(struct ext2_dx_entry);
+ (*prev_count)--;
+
+ return 0;
+}
+
+/*
+ * This function takes the leaf nodes which have been written in
+ * outdir, and populates the root node and any necessary interior nodes.
+ */
+static errcode_t calculate_tree(ext2_filsys fs,
+ struct out_dir *outdir,
+ ext2_ino_t ino,
+ ext2_ino_t parent,
+ struct ext2_inode *inode)
+{
+ struct ext2_dx_root_info *root_info;
+ struct ext2_dx_entry *root, *int_ent, *dx_ent = 0;
+ struct ext2_dx_countlimit *root_limit, *int_limit, *limit;
+ errcode_t retval;
+ int i, c1, c2, c3, nblks;
+ int limit_offset, int_offset, root_offset;
+
+ root_info = set_root_node(fs, outdir->buf, ino, parent, inode);
+ root_offset = limit_offset = ((char *) root_info - outdir->buf) +
+ root_info->info_length;
+ root_limit = (struct ext2_dx_countlimit *) (outdir->buf + limit_offset);
+ c1 = root_limit->limit;
+ nblks = outdir->num;
+
+ /* Write out the pointer blocks */
+ if (nblks - 1 <= c1) {
+ /* Just write out the root block, and we're done */
+ root = (struct ext2_dx_entry *) (outdir->buf + root_offset);
+ for (i=1; i < nblks; i++) {
+ root->block = ext2fs_cpu_to_le32(i);
+ if (i != 1)
+ root->hash =
+ ext2fs_cpu_to_le32(outdir->hashes[i]);
+ root++;
+ c1--;
+ }
+ } else if (nblks - 1 <= ext2fs_htree_intnode_maxrecs(fs, c1)) {
+ c2 = 0;
+ limit = NULL;
+ root_info->indirect_levels = 1;
+ for (i=1; i < nblks; i++) {
+ if (c2 == 0 && c1 == 0)
+ return ENOSPC;
+ if (c2 == 0) {
+ retval = alloc_blocks(fs, &limit, &root,
+ &dx_ent, &root_offset,
+ NULL, outdir, i, &c1,
+ &c2);
+ if (retval)
+ return retval;
+ }
+ dx_ent->block = ext2fs_cpu_to_le32(i);
+ if (c2 != limit->limit)
+ dx_ent->hash =
+ ext2fs_cpu_to_le32(outdir->hashes[i]);
+ dx_ent++;
+ c2--;
+ }
+ limit->count = ext2fs_cpu_to_le16(limit->limit - c2);
+ limit->limit = ext2fs_cpu_to_le16(limit->limit);
+ } else {
+ c2 = 0;
+ c3 = 0;
+ limit = NULL;
+ int_limit = 0;
+ root_info->indirect_levels = 2;
+ for (i = 1; i < nblks; i++) {
+ if (c3 == 0 && c2 == 0 && c1 == 0)
+ return ENOSPC;
+ if (c3 == 0 && c2 == 0) {
+ retval = alloc_blocks(fs, &int_limit, &root,
+ &int_ent, &root_offset,
+ &int_offset, outdir, i,
+ &c1, &c2);
+ if (retval)
+ return retval;
+ }
+ if (c3 == 0) {
+ int delta1 = (char *)int_limit - outdir->buf;
+ int delta2 = (char *)root - outdir->buf;
+
+ retval = alloc_blocks(fs, &limit, &int_ent,
+ &dx_ent, &int_offset,
+ NULL, outdir, i, &c2,
+ &c3);
+ if (retval)
+ return retval;
+
+ /* outdir->buf might be reallocated */
+ int_limit = (struct ext2_dx_countlimit *)
+ (outdir->buf + delta1);
+ root = (struct ext2_dx_entry *)
+ (outdir->buf + delta2);
+ }
+ dx_ent->block = ext2fs_cpu_to_le32(i);
+ if (c3 != limit->limit)
+ dx_ent->hash =
+ ext2fs_cpu_to_le32(outdir->hashes[i]);
+ dx_ent++;
+ c3--;
+ }
+ int_limit->count = ext2fs_cpu_to_le16(limit->limit - c2);
+ int_limit->limit = ext2fs_cpu_to_le16(limit->limit);
+
+ limit->count = ext2fs_cpu_to_le16(limit->limit - c3);
+ limit->limit = ext2fs_cpu_to_le16(limit->limit);
+
+ }
+ root_limit = (struct ext2_dx_countlimit *) (outdir->buf + limit_offset);
+ root_limit->count = ext2fs_cpu_to_le16(root_limit->limit - c1);
+ root_limit->limit = ext2fs_cpu_to_le16(root_limit->limit);
+
+ return 0;
+}
+
+struct write_dir_struct {
+ struct out_dir *outdir;
+ errcode_t err;
+ ext2_ino_t ino;
+ e2fsck_t ctx;
+ ext2_ino_t dir;
+};
+
+/*
+ * Helper function which writes out a directory block.
+ */
+static int write_dir_block(ext2_filsys fs,
+ blk64_t *block_nr,
+ e2_blkcnt_t blockcnt,
+ blk64_t ref_block EXT2FS_ATTR((unused)),
+ int ref_offset EXT2FS_ATTR((unused)),
+ void *priv_data)
+{
+ struct write_dir_struct *wd = (struct write_dir_struct *) priv_data;
+ char *dir, *buf = 0;
+
+#ifdef REHASH_DEBUG
+ printf("%u: write_dir_block %lld:%lld", wd->ino, blockcnt, *block_nr);
+#endif
+ if ((*block_nr == 0) || (blockcnt < 0)) {
+#ifdef REHASH_DEBUG
+ printf(" - skip\n");
+#endif
+ return 0;
+ }
+ if (blockcnt < wd->outdir->num)
+ dir = wd->outdir->buf + (blockcnt * fs->blocksize);
+ else if (wd->ctx->lost_and_found == wd->dir) {
+ /* Don't release any extra directory blocks for lost+found */
+ wd->err = ext2fs_new_dir_block(fs, 0, 0, &buf);
+ if (wd->err)
+ return BLOCK_ABORT;
+ dir = buf;
+ wd->outdir->num++;
+ } else {
+ /* Don't free blocks at the end of the directory, they
+ * will be truncated by the caller. */
+#ifdef REHASH_DEBUG
+ printf(" - not freed\n");
+#endif
+ return 0;
+ }
+ wd->err = ext2fs_write_dir_block4(fs, *block_nr, dir, 0, wd->dir);
+ if (buf)
+ ext2fs_free_mem(&buf);
+
+#ifdef REHASH_DEBUG
+ printf(" - write (%d)\n", wd->err);
+#endif
+ if (wd->err)
+ return BLOCK_ABORT;
+ return 0;
+}
+
+static errcode_t write_directory(e2fsck_t ctx, ext2_filsys fs,
+ struct out_dir *outdir,
+ ext2_ino_t ino, struct ext2_inode *inode,
+ int compress)
+{
+ struct write_dir_struct wd;
+ errcode_t retval;
+
+ retval = e2fsck_expand_directory(ctx, ino, -1, outdir->num);
+ if (retval)
+ return retval;
+
+ wd.outdir = outdir;
+ wd.err = 0;
+ wd.ino = ino;
+ wd.ctx = ctx;
+ wd.dir = ino;
+
+ retval = ext2fs_block_iterate3(fs, ino, 0, NULL,
+ write_dir_block, &wd);
+ if (retval)
+ return retval;
+ if (wd.err)
+ return wd.err;
+
+ e2fsck_read_inode(ctx, ino, inode, "rehash_dir");
+ if (compress)
+ inode->i_flags &= ~EXT2_INDEX_FL;
+ else
+ inode->i_flags |= EXT2_INDEX_FL;
+#ifdef REHASH_DEBUG
+ printf("%u: set inode size to %u blocks = %u bytes\n",
+ ino, outdir->num, outdir->num * fs->blocksize);
+#endif
+ retval = ext2fs_inode_size_set(fs, inode, (ext2_off64_t)outdir->num *
+ fs->blocksize);
+ if (retval)
+ return retval;
+
+ /* ext2fs_punch() calls ext2fs_write_inode() which writes the size */
+ return ext2fs_punch(fs, ino, inode, NULL, outdir->num, ~0ULL);
+}
+
+errcode_t e2fsck_rehash_dir(e2fsck_t ctx, ext2_ino_t ino,
+ struct problem_context *pctx)
+{
+ ext2_filsys fs = ctx->fs;
+ errcode_t retval;
+ struct ext2_inode inode;
+ char *dir_buf = 0;
+ struct fill_dir_struct fd = { NULL, NULL, 0, 0, 0, NULL,
+ 0, 0, 0, 0, 0, 0 };
+ struct out_dir outdir = { 0, 0, 0, 0 };
+ struct name_cmp_ctx name_cmp_ctx = {0, NULL};
+
+ e2fsck_read_inode(ctx, ino, &inode, "rehash_dir");
+
+ if (ext2fs_has_feature_inline_data(fs->super) &&
+ (inode.i_flags & EXT4_INLINE_DATA_FL))
+ return 0;
+
+ retval = ext2fs_get_mem(inode.i_size, &dir_buf);
+ if (retval)
+ goto errout;
+
+ fd.max_array = inode.i_size / 32;
+ retval = ext2fs_get_array(sizeof(struct hash_entry),
+ fd.max_array, &fd.harray);
+ if (retval)
+ goto errout;
+
+ fd.ino = ino;
+ fd.ctx = ctx;
+ fd.buf = dir_buf;
+ fd.inode = &inode;
+ fd.dir = ino;
+ if (!ext2fs_has_feature_dir_index(fs->super) ||
+ (inode.i_size / fs->blocksize) < 2)
+ fd.compress = 1;
+ fd.parent = 0;
+
+ if (fs->encoding && (inode.i_flags & EXT4_CASEFOLD_FL)) {
+ name_cmp_ctx.casefold = 1;
+ name_cmp_ctx.tbl = fs->encoding;
+ }
+
+retry_nohash:
+ /* Read in the entire directory into memory */
+ retval = ext2fs_block_iterate3(fs, ino, 0, 0,
+ fill_dir_block, &fd);
+ if (fd.err) {
+ retval = fd.err;
+ goto errout;
+ }
+
+ /*
+ * If the entries read are less than a block, then don't index
+ * the directory
+ */
+ if (!fd.compress && (fd.dir_size < (fs->blocksize - 24))) {
+ fd.compress = 1;
+ fd.dir_size = 0;
+ fd.num_array = 0;
+ goto retry_nohash;
+ }
+
+#if 0
+ printf("%d entries (%d bytes) found in inode %d\n",
+ fd.num_array, fd.dir_size, ino);
+#endif
+
+ /* Sort the list */
+resort:
+ if (fd.compress && fd.num_array > 1)
+ sort_r(fd.harray+2, fd.num_array-2, sizeof(struct hash_entry),
+ hash_cmp, &name_cmp_ctx);
+ else
+ sort_r(fd.harray, fd.num_array, sizeof(struct hash_entry),
+ hash_cmp, &name_cmp_ctx);
+
+ /*
+ * Look for duplicates
+ */
+ if (duplicate_search_and_fix(ctx, fs, ino, &fd, &name_cmp_ctx))
+ goto resort;
+
+ if (ctx->options & E2F_OPT_NO) {
+ retval = 0;
+ goto errout;
+ }
+
+ /* Sort non-hashed directories by inode number */
+ if (fd.compress && fd.num_array > 1)
+ qsort(fd.harray+2, fd.num_array-2,
+ sizeof(struct hash_entry), ino_cmp);
+
+ /*
+ * Copy the directory entries. In a htree directory these
+ * will become the leaf nodes.
+ */
+ retval = copy_dir_entries(ctx, &fd, &outdir);
+ if (retval)
+ goto errout;
+
+ free(dir_buf); dir_buf = 0;
+
+ if (!fd.compress) {
+ /* Calculate the interior nodes */
+ retval = calculate_tree(fs, &outdir, ino, fd.parent, fd.inode);
+ if (retval)
+ goto errout;
+ }
+
+ retval = write_directory(ctx, fs, &outdir, ino, &inode, fd.compress);
+ if (retval)
+ goto errout;
+
+ if (ctx->options & E2F_OPT_CONVERT_BMAP)
+ retval = e2fsck_rebuild_extents_later(ctx, ino);
+ else
+ retval = e2fsck_check_rebuild_extents(ctx, ino, &inode, pctx);
+errout:
+ ext2fs_free_mem(&dir_buf);
+ ext2fs_free_mem(&fd.harray);
+
+ free_out_dir(&outdir);
+ return retval;
+}
+
+void e2fsck_rehash_directories(e2fsck_t ctx)
+{
+ struct problem_context pctx;
+#ifdef RESOURCE_TRACK
+ struct resource_track rtrack;
+#endif
+ struct dir_info *dir;
+ ext2_u32_iterate iter;
+ struct dir_info_iter * dirinfo_iter = 0;
+ ext2_ino_t ino;
+ errcode_t retval;
+ int cur, max, all_dirs, first = 1;
+
+ init_resource_track(&rtrack, ctx->fs->io);
+ all_dirs = ctx->options & E2F_OPT_COMPRESS_DIRS;
+
+ if (!ctx->dirs_to_hash && !all_dirs)
+ return;
+
+ (void) e2fsck_get_lost_and_found(ctx, 0);
+
+ clear_problem_context(&pctx);
+
+ cur = 0;
+ if (all_dirs) {
+ dirinfo_iter = e2fsck_dir_info_iter_begin(ctx);
+ max = e2fsck_get_num_dirinfo(ctx);
+ } else {
+ retval = ext2fs_u32_list_iterate_begin(ctx->dirs_to_hash,
+ &iter);
+ if (retval) {
+ pctx.errcode = retval;
+ fix_problem(ctx, PR_3A_OPTIMIZE_ITER, &pctx);
+ return;
+ }
+ max = ext2fs_u32_list_count(ctx->dirs_to_hash);
+ }
+ while (1) {
+ if (all_dirs) {
+ if ((dir = e2fsck_dir_info_iter(ctx,
+ dirinfo_iter)) == 0)
+ break;
+ ino = dir->ino;
+ } else {
+ if (!ext2fs_u32_list_iterate(iter, &ino))
+ break;
+ }
+ if (!ext2fs_test_inode_bitmap2(ctx->inode_dir_map, ino))
+ continue;
+
+ pctx.dir = ino;
+ if (first) {
+ fix_problem(ctx, PR_3A_PASS_HEADER, &pctx);
+ first = 0;
+ }
+#if 0
+ fix_problem(ctx, PR_3A_OPTIMIZE_DIR, &pctx);
+#endif
+ pctx.errcode = e2fsck_rehash_dir(ctx, ino, &pctx);
+ if (pctx.errcode) {
+ end_problem_latch(ctx, PR_LATCH_OPTIMIZE_DIR);
+ fix_problem(ctx, PR_3A_OPTIMIZE_DIR_ERR, &pctx);
+ }
+ if (ctx->progress && !ctx->progress_fd)
+ e2fsck_simple_progress(ctx, "Rebuilding directory",
+ 100.0 * (float) (++cur) / (float) max, ino);
+ }
+ end_problem_latch(ctx, PR_LATCH_OPTIMIZE_DIR);
+ if (all_dirs)
+ e2fsck_dir_info_iter_end(ctx, dirinfo_iter);
+ else
+ ext2fs_u32_list_iterate_end(iter);
+
+ if (ctx->dirs_to_hash)
+ ext2fs_u32_list_free(ctx->dirs_to_hash);
+ ctx->dirs_to_hash = 0;
+
+ print_resource_track(ctx, "Pass 3A", &rtrack, ctx->fs->io);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-07 11:03:28 +0000