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Message-ID: <CAD+ocby2BuhQRq=YLeV7E2gCiKDGXMKvfL4=RLdSVj6afrr9bw@mail.gmail.com>
Date: Mon, 15 Mar 2021 09:53:03 -0700
From: harshad shirwadkar <harshadshirwadkar@...il.com>
To: Zhiqiang Liu <liuzhiqiang26@...wei.com>
Cc: Haotian Li <lihaotian9@...wei.com>,
Ext4 Developers List <linux-ext4@...r.kernel.org>,
"Theodore Y. Ts'o" <tytso@....edu>,
linfeilong <linfeilong@...wei.com>, liangyun2@...wei.com
Subject: Re: [PATCH v2] e2fsck: Avoid changes on recovery flags when
jbd2_journal_recover() failed
Thanks for the updated patch. Just have some a couple of minor nits
but other than that this looks good.
Reviewed-by: Harshad Shirwadkar <harshadshirwadkar@...il.com>
On Thu, Mar 11, 2021 at 3:50 AM Zhiqiang Liu <liuzhiqiang26@...wei.com> wrote:
>
> friendly ping..
>
> On 2021/3/6 15:27, Haotian Li wrote:
> > jbd2_journal_recover() may fail when some error occers such
> > as ENOMEM and EIO. However, jsb->s_start is still cleared
> > by func e2fsck_journal_release(). This may break consistency
> > between metadata and data in disk. Sometimes, failure in
> > jbd2_journal_recover() is temporary but retry e2fsck will
> > skip the journal recovery when the temporary problem is fixed.
> >
> > Following harshad shirwadkar's suggestion，we add an option
> > "recovery_error_behavior" with default value "continue" to
> > e2fsck.conf. User may set it to "retry" or "exit" to adopt
> > different behavior when such journal recovery errors occur.
> >
> > Reported-by: Liangyun <liangyun2@...wei.com>
> > Signed-off-by: Haotian Li <lihaotian9@...wei.com>
> > Signed-off-by: Zhiqiang Liu <liuzhiqiang26@...wei.com>
> > ---
> > e2fsck/e2fsck.h | 11 +++++++++++
> > e2fsck/journal.c | 33 +++++++++++++++++++++++++++++++--
> > e2fsck/unix.c | 13 ++++++++++++-
> > 3 files changed, 54 insertions(+), 3 deletions(-)
> >
> > diff --git a/e2fsck/e2fsck.h b/e2fsck/e2fsck.h
> > index 15d043ee..22f9ad11 100644
> > --- a/e2fsck/e2fsck.h
> > +++ b/e2fsck/e2fsck.h
> > @@ -451,6 +451,9 @@ struct e2fsck_struct {
> >
> > /* Fast commit replay state */
> > struct e2fsck_fc_replay_state fc_replay_state;
> > +
> > + /* Behavior when journal recovery fails */
> > + int recovery_error_behavior;
> > };
> >
> > /* Data structures to evaluate whether an extent tree needs rebuilding. */
> > @@ -474,6 +477,14 @@ typedef struct region_struct *region_t;
> > extern int e2fsck_strnlen(const char * s, int count);
> > #endif
> >
> > +/* Different behaviors when journal recovery fails */
> > +#define RECOVERY_ERROR_CONTINUE 0
> > +#define RECOVERY_ERROR_RETRY 1
> > +#define RECOVERY_ERROR_EXIT 2
> > +
> > +/* Journal retry times if RECOVERY_ERROR_RETRY is set*/
> > +#define RECOVERY_TIMES_LIMIT 3
> > +
> > /*
> > * Procedure declarations
> > */
> > diff --git a/e2fsck/journal.c b/e2fsck/journal.c
> > index a425bbd1..c1c6f6ee 100644
> > --- a/e2fsck/journal.c
> > +++ b/e2fsck/journal.c
> > @@ -1600,11 +1600,26 @@ no_has_journal:
> > return retval;
> > }
> >
> > +static void set_recovery_error_behavior(e2fsck_t ctx, const char *recovery_behavior)
> > +{
> > + if (!recovery_behavior) {
> > + ctx->recovery_error_behavior = RECOVERY_ERROR_CONTINUE;
> > + return;
> > + }
> > + if (strcmp(recovery_behavior, "retry") == 0)
> > + ctx->recovery_error_behavior = RECOVERY_ERROR_RETRY;
> > + else if (strcmp(recovery_behavior, "exit") == 0)
> > + ctx->recovery_error_behavior = RECOVERY_ERROR_EXIT;
> > + else
> > + ctx->recovery_error_behavior = RECOVERY_ERROR_CONTINUE;
> > +}
> > +
> > static errcode_t recover_ext3_journal(e2fsck_t ctx)
> > {
> > struct problem_context pctx;
> > journal_t *journal;
> > errcode_t retval;
> > + char *recovery_behavior = 0;
> >
> > clear_problem_context(&pctx);
> >
> > @@ -1629,8 +1644,12 @@ static errcode_t recover_ext3_journal(e2fsck_t ctx)
> > goto errout;
> >
> > retval = -jbd2_journal_recover(journal);
> > - if (retval)
> > + if (retval) {
> > + profile_get_string(ctx->profile, "options", "recovery_error_behavior",
> > + 0, "continue", &recovery_behavior);
> > + set_recovery_error_behavior(ctx, recovery_behavior);
> > goto errout;
> > + }
> >
> > if (journal->j_failed_commit) {
> > pctx.ino = journal->j_failed_commit;
> > @@ -1645,7 +1664,15 @@ errout:
> > jbd2_journal_destroy_revoke(journal);
> > jbd2_journal_destroy_revoke_record_cache();
> > jbd2_journal_destroy_revoke_table_cache();
> > - e2fsck_journal_release(ctx, journal, 1, 0);
> > + if (retval == 0 || ctx->recovery_error_behavior == RECOVERY_ERROR_CONTINUE)
> > + e2fsck_journal_release(ctx, journal, 1, 0);
> > + if (retval && ctx->recovery_error_behavior == RECOVERY_ERROR_EXIT) {
> > + ctx->fs->flags &= ~EXT2_FLAG_VALID;
> > + com_err(ctx->program_name, 0,
> > + _("Journal recovery failed "
> > + "on %s\n"), ctx->device_name);
> > + fatal_error(ctx, 0);
> > + }
> > return retval;
> > }
> >
> > @@ -1697,6 +1724,8 @@ errcode_t e2fsck_run_ext3_journal(e2fsck_t ctx)
> >
> > /* Set the superblock flags */
> > e2fsck_clear_recover(ctx, recover_retval != 0);
> > + if (recover_retval != 0 && ctx->recovery_error_behavior == RECOVERY_ERROR_RETRY)
> > + ext2fs_set_feature_journal_needs_recovery(ctx->fs->super);
> >
> > /*
> > * Do one last sanity check, and propagate journal->s_errno to
> > diff --git a/e2fsck/unix.c b/e2fsck/unix.c
> > index c5f9e441..25978471 100644
> > --- a/e2fsck/unix.c
> > +++ b/e2fsck/unix.c
> > @@ -1068,6 +1068,8 @@ static errcode_t PRS(int argc, char *argv[], e2fsck_t *ret_ctx)
> > if (c)
> > ctx->options |= E2F_OPT_ICOUNT_FULLMAP;
> >
> > + ctx->recovery_error_behavior = RECOVERY_ERROR_CONTINUE;
> > +
> > if (ctx->readahead_kb == ~0ULL) {
> > profile_get_integer(ctx->profile, "options",
> > "readahead_mem_pct", 0, -1, &c);
> > @@ -1776,6 +1778,7 @@ failure:
> > "doing a read-only filesystem check.\n"));
> > io_channel_flush(ctx->fs->io);
> > } else {
> > + int recovery_retry_times = 0;
> > if (ctx->flags & E2F_FLAG_RESTARTED) {
> > /*
> > * Whoops, we attempted to run the
> > @@ -1788,7 +1791,15 @@ failure:
> > "on %s\n"), ctx->device_name);
> > fatal_error(ctx, 0);
> > }
> > - retval = e2fsck_run_ext3_journal(ctx);
> > + while (recovery_retry_times++ < RECOVERY_TIMES_LIMIT) {
> > + retval = e2fsck_run_ext3_journal(ctx);
> > + if (retval && ctx->recovery_error_behavior == RECOVERY_ERROR_RETRY) {
> > + log_out(ctx, _("Try to recovery Journal "
> > + "again in %s\n"),
(nit) I think there's no reason to break the string into 2 lines. This
will make this string searchable.
> > + ctx->device_name);
> > + } else
> > + break;
(style) Since you have {} brackets for if condition, please add it for
else too (or remove it for if condition too)
Thanks,
Harshad
> > + }
> > if (retval == EFSBADCRC) {
> > log_out(ctx, _("Journal checksum error "
> > "found in %s\n"),
>
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