e2fsck: skip quota update when interrupted

There is a bug in how e2fsck handles being interrupted by CTRL-C.
If CTRL-C is pressed to kill e2fsck rather than e.g. kill -9, then
the interrupt handler sets E2F_FLAG_CANCEL in the context but doesn't
actually kill the process.  Instead, e2fsck_pass1() checks this flag
before processing the next inode.

If a filesystem is running in fix mode (e2fsck -fy) is interrupted,
and the quota feature is enabled, then the quota file will still be
written to disk even though the inode scan was not complete and the
quota information is totally inaccurate.  Even worse, if the Pass 1
inode and block scan was not finished, then the in-memory block
bitmaps (which are used for block allocation during e2fsck) are also
invalid, so any blocks allocated to the quota files may corrupt other
files if those blocks were actually used.

  e2fsck 1.42.13.wc3 (28-Aug-2015)
  Pass 1: Checking inodes, blocks, and sizes
  ^C[QUOTA WARNING] Usage inconsistent for ID 0:
      actual (6455296, 168) != expected (8568832, 231)
  [QUOTA WARNING] Usage inconsistent for ID 695:
      actual (614932320256, 63981) != expected (2102405386240, 176432)
  Update quota info for quota type 0? yes

  [QUOTA WARNING] Usage inconsistent for ID 0:
      actual (6455296, 168) != expected (8568832, 231)
  [QUOTA WARNING] Usage inconsistent for ID 538:
      actual (614932320256, 63981) != expected (2102405386240, 176432)
  Update quota info for quota type 1? yes

  myth-OST0001: e2fsck canceled.
  myth-OST0001: ***** FILE SYSTEM WAS MODIFIED *****

There may be a desire to flush out modified inodes and such that have
been repaired, so that restarting an interrupted e2fsck will make
progress, but the quota file update is plain wrong unless at least
pass1 has finished, and the journal recreation is also dangerous if
the block bitmaps have not been fully updated.

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/e2fsck/e2fsck.c b/e2fsck/e2fsck.c
index 0ec1540..2002dc0 100644 (file)
--- a/e2fsck/e2fsck.c
+++ b/e2fsck/e2fsck.c
@@ -203,8 +203,6 @@ static pass_t e2fsck_passes[] = {
        e2fsck_pass1, e2fsck_pass2, e2fsck_pass3, e2fsck_pass4,
        e2fsck_pass5, 0 };
 
-#define E2F_FLAG_RUN_RETURN    (E2F_FLAG_SIGNAL_MASK|E2F_FLAG_RESTART)
-
 int e2fsck_run(e2fsck_t ctx)
 {
        int     i;

diff --git a/e2fsck/e2fsck.h b/e2fsck/e2fsck.h
index f904026..810030e 100644 (file)
--- a/e2fsck/e2fsck.h
+++ b/e2fsck/e2fsck.h
@@ -173,10 +173,10 @@ struct resource_track {
  */
 #define E2F_FLAG_ABORT         0x0001 /* Abort signaled */
 #define E2F_FLAG_CANCEL                0x0002 /* Cancel signaled */
-#define E2F_FLAG_SIGNAL_MASK   0x0003
+#define E2F_FLAG_SIGNAL_MASK   (E2F_FLAG_ABORT | E2F_FLAG_CANCEL)
 #define E2F_FLAG_RESTART       0x0004 /* Restart signaled */
+#define E2F_FLAG_RUN_RETURN    (E2F_FLAG_SIGNAL_MASK | E2F_FLAG_RESTART)
 #define E2F_FLAG_RESTART_LATER 0x0008 /* Restart after all iterations done */
-
 #define E2F_FLAG_SETJMP_OK     0x0010 /* Setjmp valid for abort */
 
 #define E2F_FLAG_PROG_BAR      0x0020 /* Progress bar on screen */

diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
index 3bf481f..ac3ea4e 100644 (file)
--- a/e2fsck/pass1.c
+++ b/e2fsck/pass1.c
@@ -766,7 +766,7 @@ void e2fsck_pass1(e2fsck_t ctx)
                                                          inode, inode_size);
                ehandler_operation(old_op);
                if (ctx->flags & E2F_FLAG_SIGNAL_MASK)
-                       return;
+                       goto endit;
                if (pctx.errcode == EXT2_ET_BAD_BLOCK_IN_INODE_TABLE) {
                        if (!ctx->inode_bb_map)
                                alloc_bb_map(ctx);
@@ -1277,6 +1277,8 @@ endit:
 
        if ((ctx->flags & E2F_FLAG_SIGNAL_MASK) == 0)
                print_resource_track(ctx, _("Pass 1"), &rtrack, ctx->fs->io);
+       else
+               ctx->invalid_bitmaps++;
 }
 
 /*

diff --git a/e2fsck/pass2.c b/e2fsck/pass2.c
index 4acddae..b8f7e33 100644 (file)
--- a/e2fsck/pass2.c
+++ b/e2fsck/pass2.c
@@ -148,14 +148,14 @@ void e2fsck_pass2(e2fsck_t ctx)
 
        cd.pctx.errcode = ext2fs_dblist_iterate2(fs->dblist, check_dir_block,
                                                 &cd);
-       if (ctx->flags & E2F_FLAG_SIGNAL_MASK || ctx->flags & E2F_FLAG_RESTART)
-               return;
-
        if (ctx->flags & E2F_FLAG_RESTART_LATER) {
                ctx->flags |= E2F_FLAG_RESTART;
-               return;
+               ctx->flags &= ~E2F_FLAG_RESTART_LATER;
        }
 
+       if (ctx->flags & E2F_FLAG_RUN_RETURN)
+               return;
+
        if (cd.pctx.errcode) {
                fix_problem(ctx, PR_2_DBLIST_ITERATE, &cd.pctx);
                ctx->flags |= E2F_FLAG_ABORT;
@@ -739,7 +739,7 @@ static int check_dir_block(ext2_filsys fs,
        buf = cd->buf;
        ctx = cd->ctx;
 
-       if (ctx->flags & E2F_FLAG_SIGNAL_MASK || ctx->flags & E2F_FLAG_RESTART)
+       if (ctx->flags & E2F_FLAG_RUN_RETURN)
                return DIRENT_ABORT;
 
        if (ctx->progress && (ctx->progress)(ctx, 2, cd->count++, cd->max))

diff --git a/e2fsck/unix.c b/e2fsck/unix.c
index 10036e7..9d9ba04 100644 (file)
--- a/e2fsck/unix.c
+++ b/e2fsck/unix.c
@@ -1667,8 +1667,15 @@ print_unsupp_features:
        }
 no_journal:
 
-       if (ctx->qctx) {
+       if (run_result & E2F_FLAG_ABORT) {
+               fatal_error(ctx, _("aborted"));
+       } else if (run_result & E2F_FLAG_CANCEL) {
+               log_out(ctx, _("%s: e2fsck canceled.\n"), ctx->device_name ?
+                       ctx->device_name : ctx->filesystem_name);
+               exit_value |= FSCK_CANCELED;
+       } else if (ctx->qctx && !ctx->invalid_bitmaps) {
                int i, needs_writeout;
+
                for (i = 0; i < MAXQUOTAS; i++) {
                        if (qtype != -1 && qtype != i)
                                continue;
@@ -1695,18 +1702,13 @@ no_journal:
                ext2fs_close_free(&ctx->fs);
                goto restart;
        }
-       if (run_result & E2F_FLAG_ABORT)
-               fatal_error(ctx, _("aborted"));
 
 #ifdef MTRACE
        mtrace_print("Cleanup");
 #endif
        was_changed = ext2fs_test_changed(fs);
-       if (run_result & E2F_FLAG_CANCEL) {
-               log_out(ctx, _("%s: e2fsck canceled.\n"), ctx->device_name ?
-                       ctx->device_name : ctx->filesystem_name);
-               exit_value |= FSCK_CANCELED;
-       } else if (!(ctx->options & E2F_OPT_READONLY)) {
+       if (!(ctx->flags & E2F_FLAG_RUN_RETURN) &&
+           !(ctx->options & E2F_OPT_READONLY)) {
                if (ext2fs_test_valid(fs)) {
                        if (!(sb->s_state & EXT2_VALID_FS))
                                exit_value |= FSCK_NONDESTRUCT;