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Date: Mon, 7 Nov 2022 17:51:55 +0530
From: "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
To: Theodore Ts'o <tytso@....edu>
Cc: linux-ext4@...r.kernel.org,
Harshad Shirwadkar <harshadshirwadkar@...il.com>,
Wang Shilong <wshilong@....com>,
Andreas Dilger <adilger.kernel@...ger.ca>,
Li Xi <lixi@....com>, Sebastien Buisson <sbuisson@....com>,
Maloo <maloo@...mcloud.com>, Li Dongyang <dongyangli@....com>,
Andreas Dilger <adilger@...mcloud.com>,
Ritesh Harjani <ritesh.list@...il.com>
Subject: [RFCv1 67/72] sec: support encrypted files handling in pfsck mode
From: Sebastien Buisson <sbuisson@....com>
e2fsck needs to be improved in order to support encrypted files
handling in parallel fsck mode. The e2fsck_merge_encrypted_info()
function is added to merge encrypted inodes info collected from
different threads in pass1, so that it can be used in pass2.
Signed-off-by: Sebastien Buisson <sbuisson@....com>
Tested-by: Maloo <maloo@...mcloud.com>
Reviewed-by: Li Dongyang <dongyangli@....com>
Reviewed-by: Andreas Dilger <adilger@...mcloud.com>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>
---
e2fsck/e2fsck.h | 2 +
e2fsck/encrypted_files.c | 139 +++++++++++++++++++++++++++++++++++++++
e2fsck/pass1.c | 26 +++++++-
3 files changed, 164 insertions(+), 3 deletions(-)
diff --git a/e2fsck/e2fsck.h b/e2fsck/e2fsck.h
index 1e82b048..e4fb782a 100644
--- a/e2fsck/e2fsck.h
+++ b/e2fsck/e2fsck.h
@@ -642,6 +642,8 @@ __u32 find_encryption_policy(e2fsck_t ctx, ext2_ino_t ino);
void destroy_encryption_policy_map(e2fsck_t ctx);
void destroy_encrypted_file_info(e2fsck_t ctx);
+int e2fsck_merge_encrypted_info(e2fsck_t ctx, struct encrypted_file_info *src,
+ struct encrypted_file_info *dest);
/* extents.c */
errcode_t e2fsck_rebuild_extents_later(e2fsck_t ctx, ext2_ino_t ino);
diff --git a/e2fsck/encrypted_files.c b/e2fsck/encrypted_files.c
index 16be2d6d..53e03a62 100644
--- a/e2fsck/encrypted_files.c
+++ b/e2fsck/encrypted_files.c
@@ -456,3 +456,142 @@ void destroy_encrypted_file_info(e2fsck_t ctx)
ctx->encrypted_files = NULL;
}
}
+
+/**
+ * Search policy matching @policy in @info->policies
+ * @ctx: e2fsck context
+ * @info: encrypted_file_info to look into
+ * @policy: the policy we are looking for
+ * @parent: (out) last known parent, useful to insert a new leaf
+ * in @info->policies
+ *
+ * Return: id of found policy on success, -1 if no matching policy found.
+ */
+static inline int search_policy(e2fsck_t ctx, struct encrypted_file_info *info,
+ union fscrypt_policy policy,
+ struct rb_node **parent)
+{
+ struct rb_node *n = info->policies.rb_node;
+ struct policy_map_entry *entry;
+
+ while (n) {
+ int res;
+
+ *parent = n;
+ entry = ext2fs_rb_entry(n, struct policy_map_entry, node);
+ res = cmp_fscrypt_policies(ctx, &policy, &entry->policy);
+ if (res < 0)
+ n = n->rb_left;
+ else if (res > 0)
+ n = n->rb_right;
+ else
+ return entry->policy_id;
+ }
+ return -1;
+}
+
+/*
+ * Merge @src encrypted info into @dest
+ */
+int e2fsck_merge_encrypted_info(e2fsck_t ctx, struct encrypted_file_info *src,
+ struct encrypted_file_info *dest)
+{
+ struct rb_root *src_policies = &src->policies;
+ __u32 *policy_trans;
+ int i, rc = 0;
+
+ if (dest->file_ranges[src->file_ranges_count - 1].last_ino >
+ src->file_ranges[0].first_ino) {
+ /* Should never get here */
+ fatal_error(ctx, "Encrypted inodes processed out of order");
+ }
+
+ rc = ext2fs_get_array(src->next_policy_id, sizeof(__u32),
+ &policy_trans);
+ if (rc)
+ return rc;
+
+ /* First, deal with the encryption policy => ID map.
+ * Compare encryption policies in src with policies already recorded
+ * in dest. It can be similar policies, but recorded with a different
+ * id, so policy_trans array converts policy ids in src to ids in dest.
+ * This loop examines each policy in src->policies rb tree, updates
+ * policy_trans, and removes the entry from src, so that src->policies
+ * rb tree is cleaned up at the end of the loop.
+ */
+ while (!ext2fs_rb_empty_root(src_policies)) {
+ struct policy_map_entry *entry, *newentry;
+ struct rb_node *new, *parent = NULL;
+ int existing_polid;
+
+ entry = ext2fs_rb_entry(src_policies->rb_node,
+ struct policy_map_entry, node);
+ existing_polid = search_policy(ctx, dest,
+ entry->policy, &parent);
+ if (existing_polid >= 0) {
+ /* The policy in src is already recorded in dest,
+ * so just update its id.
+ */
+ policy_trans[entry->policy_id] = existing_polid;
+ } else {
+ /* The policy in src is new to dest, so insert it
+ * with the next available id (its original id could
+ * be already used in dest).
+ */
+ rc = ext2fs_get_mem(sizeof(*newentry), &newentry);
+ if (rc)
+ goto out_merge;
+ newentry->policy_id = dest->next_policy_id++;
+ newentry->policy = entry->policy;
+ ext2fs_rb_link_node(&newentry->node, parent, &new);
+ ext2fs_rb_insert_color(&newentry->node,
+ &dest->policies);
+ policy_trans[entry->policy_id] = newentry->policy_id;
+ }
+ ext2fs_rb_erase(&entry->node, src_policies);
+ ext2fs_free_mem(&entry);
+ }
+
+ /* Second, deal with the inode number => encryption policy ID map. */
+ if (dest->file_ranges_capacity <
+ dest->file_ranges_count + src->file_ranges_count) {
+ /* dest->file_ranges is too short, increase its capacity. */
+ size_t new_capacity = dest->file_ranges_count +
+ src->file_ranges_count;
+
+ /* Make sure we at least double the capacity. */
+ if (new_capacity < (dest->file_ranges_capacity * 2))
+ new_capacity = dest->file_ranges_capacity * 2;
+
+ /* We won't need more than the filesystem's inode count. */
+ if (new_capacity > ctx->fs->super->s_inodes_count)
+ new_capacity = ctx->fs->super->s_inodes_count;
+
+ rc = ext2fs_resize_mem(dest->file_ranges_capacity *
+ sizeof(struct encrypted_file_range),
+ new_capacity *
+ sizeof(struct encrypted_file_range),
+ &dest->file_ranges);
+ if (rc) {
+ fix_problem(ctx, PR_1_ALLOCATE_ENCRYPTED_INODE_LIST,
+ NULL);
+ /* Should never get here */
+ ctx->flags |= E2F_FLAG_ABORT;
+ goto out_merge;
+ }
+
+ dest->file_ranges_capacity = new_capacity;
+ }
+ /* Copy file ranges from src to dest. */
+ for (i = 0; i < src->file_ranges_count; i++) {
+ /* Make sure to convert policy ids in src. */
+ src->file_ranges[i].policy_id =
+ policy_trans[src->file_ranges[i].policy_id];
+ dest->file_ranges[dest->file_ranges_count++] =
+ src->file_ranges[i];
+ }
+
+out_merge:
+ ext2fs_free_mem(&policy_trans);
+ return rc;
+}
diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
index 7345c96d..e7dc017c 100644
--- a/e2fsck/pass1.c
+++ b/e2fsck/pass1.c
@@ -2411,9 +2411,6 @@ void e2fsck_pass1_run(e2fsck_t ctx)
ctx->ea_block_quota_inodes = 0;
}
- /* We don't need the encryption policy => ID map any more */
- destroy_encryption_policy_map(ctx);
-
if (ctx->flags & E2F_FLAG_RESTART) {
/*
* Only the master copy of the superblock and block
@@ -2703,6 +2700,23 @@ static void e2fsck_pass1_merge_dx_dir(e2fsck_t global_ctx, e2fsck_t thread_ctx)
e2fsck_merge_dx_dir(global_ctx, thread_ctx);
}
+static int e2fsck_pass1_merge_encrypted_info(e2fsck_t global_ctx,
+ e2fsck_t thread_ctx)
+{
+ if (thread_ctx->encrypted_files == NULL)
+ return 0;
+
+ if (global_ctx->encrypted_files == NULL) {
+ global_ctx->encrypted_files = thread_ctx->encrypted_files;
+ thread_ctx->encrypted_files = NULL;
+ return 0;
+ }
+
+ return e2fsck_merge_encrypted_info(global_ctx,
+ thread_ctx->encrypted_files,
+ global_ctx->encrypted_files);
+}
+
static inline errcode_t
e2fsck_pass1_merge_icount(ext2_icount_t *dest_icount,
ext2_icount_t *src_icount)
@@ -2963,6 +2977,12 @@ static errcode_t e2fsck_pass1_merge_context(e2fsck_t global_ctx,
e2fsck_pass1_merge_dir_info(global_ctx, thread_ctx);
e2fsck_pass1_merge_dx_dir(global_ctx, thread_ctx);
+ retval = e2fsck_pass1_merge_encrypted_info(global_ctx, thread_ctx);
+ if (retval) {
+ com_err(global_ctx->program_name, 0,
+ _("while merging encrypted info\n"));
+ return retval;
+ }
retval = ext2fs_merge_fs(&(thread_ctx->fs));
if (retval) {
--
2.37.3
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