[PATCH 23/51] e2fsck: Verify htree root/node checksums
From: Darrick J. Wong <hidden>
Date: 2011-12-14 01:15:57
Subsystem:
the rest · Maintainer:
Linus Torvalds
Check htree internal node checksums. If broken, ask user to clear the htree index and recreate it later. Signed-off-by: Darrick J. Wong <redacted> --- e2fsck/pass2.c | 31 ++++++++++++++++++++++++++----- e2fsck/problem.c | 10 ++++++++++ e2fsck/problem.h | 6 ++++++ e2fsck/rehash.c | 16 ++++++++++++++-- 4 files changed, 56 insertions(+), 7 deletions(-)
diff --git a/e2fsck/pass2.c b/e2fsck/pass2.c
index 103b155..e11ddbf 100644
--- a/e2fsck/pass2.c
+++ b/e2fsck/pass2.c@@ -522,7 +522,7 @@ static void parse_int_node(ext2_filsys fs, struct ext2_db_entry2 *db, struct check_dir_struct *cd, struct dx_dir_info *dx_dir, - char *block_buf) + char *block_buf, int failed_csum) { struct ext2_dx_root_info *root; struct ext2_dx_entry *ent;
@@ -533,6 +533,7 @@ static void parse_int_node(ext2_filsys fs, ext2_dirhash_t min_hash = 0xffffffff; ext2_dirhash_t max_hash = 0; ext2_dirhash_t hash = 0, prev_hash; + int csum_size = 0; if (db->blockcnt == 0) { root = (struct ext2_dx_root_info *) (block_buf + 24);
@@ -547,9 +548,20 @@ static void parse_int_node(ext2_filsys fs, #endif ent = (struct ext2_dx_entry *) (block_buf + 24 + root->info_length); + + if (failed_csum && + fix_problem(cd->ctx, PR_2_HTREE_ROOT_CSUM_INVALID, + &cd->pctx)) + goto clear_and_exit; } else { ent = (struct ext2_dx_entry *) (block_buf+8); + + if (failed_csum && + fix_problem(cd->ctx, PR_2_HTREE_NODE_CSUM_INVALID, + &cd->pctx)) + goto clear_and_exit; } + limit = (struct ext2_dx_countlimit *) ent; #ifdef DX_DEBUG
@@ -560,8 +572,12 @@ static void parse_int_node(ext2_filsys fs, #endif count = ext2fs_le16_to_cpu(limit->count); - expect_limit = (fs->blocksize - ((char *) ent - block_buf)) / - sizeof(struct ext2_dx_entry); + if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super, + EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) + csum_size = sizeof(struct ext2_dx_tail); + expect_limit = (fs->blocksize - + (csum_size + ((char *) ent - block_buf))) / + sizeof(struct ext2_dx_entry); if (ext2fs_le16_to_cpu(limit->limit) != expect_limit) { cd->pctx.num = ext2fs_le16_to_cpu(limit->limit); if (fix_problem(cd->ctx, PR_2_HTREE_BAD_LIMIT, &cd->pctx))
@@ -729,6 +745,7 @@ static int check_dir_block(ext2_filsys fs, struct problem_context pctx; int dups_found = 0; int ret; + int csum_size = 0; cd = (struct check_dir_struct *) priv_data; buf = cd->buf;
@@ -740,6 +757,10 @@ static int check_dir_block(ext2_filsys fs, if (ctx->progress && (ctx->progress)(ctx, 2, cd->count++, cd->max)) return DIRENT_ABORT; + if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super, + EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) + csum_size = sizeof(struct ext2_dx_tail); + /* * Make sure the inode is still in use (could have been * deleted in the duplicate/bad blocks pass.
@@ -829,7 +850,7 @@ static int check_dir_block(ext2_filsys fs, (rec_len == fs->blocksize) && (dirent->name_len == 0) && (ext2fs_le16_to_cpu(limit->limit) == - ((fs->blocksize-8) / + ((fs->blocksize - (8 + csum_size)) / sizeof(struct ext2_dx_entry)))) dx_db->type = DX_DIRBLOCK_NODE; }
@@ -1116,7 +1137,7 @@ out_htree: cd->pctx.dir = cd->pctx.ino; if ((dx_db->type == DX_DIRBLOCK_ROOT) || (dx_db->type == DX_DIRBLOCK_NODE)) - parse_int_node(fs, db, cd, dx_dir, buf); + parse_int_node(fs, db, cd, dx_dir, buf, 0); } #endif /* ENABLE_HTREE */ if (offset != fs->blocksize) {
diff --git a/e2fsck/problem.c b/e2fsck/problem.c
index 96b0de5..2e9ab7f 100644
--- a/e2fsck/problem.c
+++ b/e2fsck/problem.c@@ -1374,6 +1374,16 @@ static struct e2fsck_problem problem_table[] = { N_("i_file_acl_hi @F %N, @s zero.\n"), PROMPT_CLEAR, PR_PREEN_OK }, + /* htree root node fails checksum */ + { PR_2_HTREE_ROOT_CSUM_INVALID, + N_("@p @h %d: root node fails checksum\n"), + PROMPT_CLEAR_HTREE, PR_PREEN_OK }, + + /* htree internal node fails checksum */ + { PR_2_HTREE_NODE_CSUM_INVALID, + N_("@p @h %d: node fails checksum\n"), + PROMPT_CLEAR_HTREE, PR_PREEN_OK }, + /* Pass 3 errors */ /* Pass 3: Checking directory connectivity */
diff --git a/e2fsck/problem.h b/e2fsck/problem.h
index a1e7ffb..08c06e1 100644
--- a/e2fsck/problem.h
+++ b/e2fsck/problem.h@@ -821,6 +821,12 @@ struct problem_context { /* i_file_acl_hi should be zero */ #define PR_2_I_FILE_ACL_HI_ZERO 0x020048 +/* htree root node fails checksum */ +#define PR_2_HTREE_ROOT_CSUM_INVALID 0x020049 + +/* htree node fails checksum */ +#define PR_2_HTREE_NODE_CSUM_INVALID 0x02004A + /* * Pass 3 errors */
diff --git a/e2fsck/rehash.c b/e2fsck/rehash.c
index 15993b3..a472aad 100644
--- a/e2fsck/rehash.c
+++ b/e2fsck/rehash.c@@ -495,6 +495,7 @@ static struct ext2_dx_root_info *set_root_node(ext2_filsys fs, char *buf, struct ext2_dx_root_info *root; struct ext2_dx_countlimit *limits; int filetype = 0; + int csum_size = 0; if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_FILETYPE) filetype = EXT2_FT_DIR << 8;
@@ -519,8 +520,13 @@ static struct ext2_dx_root_info *set_root_node(ext2_filsys fs, char *buf, root->indirect_levels = 0; root->unused_flags = 0; + if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super, + EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) + csum_size = sizeof(struct ext2_dx_tail); + limits = (struct ext2_dx_countlimit *) (buf+32); - limits->limit = (fs->blocksize - 32) / sizeof(struct ext2_dx_entry); + limits->limit = (fs->blocksize - (32 + csum_size)) / + sizeof(struct ext2_dx_entry); limits->count = 0; return root;
@@ -531,14 +537,20 @@ 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 (EXT2_HAS_RO_COMPAT_FEATURE(fs->super, + EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) + csum_size = sizeof(struct ext2_dx_tail); + limits = (struct ext2_dx_countlimit *) (buf+8); - limits->limit = (fs->blocksize - 8) / sizeof(struct ext2_dx_entry); + limits->limit = (fs->blocksize - (8 + csum_size)) / + sizeof(struct ext2_dx_entry); limits->count = 0; return (struct ext2_dx_entry *) limits;