Commit 0636c73e authored by Eric Sandeen's avatar Eric Sandeen Committed by Jan Kara
Browse files

ext3: make barrier options consistent with ext4

ext4 was updated to accept barrier/nobarrier mount options
in addition to the older barrier=0/1.  The barrier story
is complex enough, we should help people by making the options
the same at least, even if the defaults are different.

This patch allows the barrier/nobarrier mount options for ext3,
while keeping nobarrier the default.

It also unconditionally displays barrier status in show_options,
and prints a message at mount time if barriers are not enabled,
just as ext4 does.
Signed-off-by: default avatarEric Sandeen <>
Signed-off-by: default avatarJan Kara <>
parent dde95888
......@@ -59,8 +59,19 @@ commit=nrsec (*) Ext3 can be told to sync all its data and metadata
Setting it to very large values will improve
barrier=1 This enables/disables barriers. barrier=0 disables
it, barrier=1 enables it.
barrier=<0(*)|1> This enables/disables the use of write barriers in
barrier the jbd code. barrier=0 disables, barrier=1 enables.
nobarrier (*) This also requires an IO stack which can support
barriers, and if jbd gets an error on a barrier
write, it will disable again with a warning.
Write barriers enforce proper on-disk ordering
of journal commits, making volatile disk write caches
safe to use, at some performance penalty. If
your disks are battery-backed in one way or another,
disabling barriers may safely improve performance.
The mount options "barrier" and "nobarrier" can
also be used to enable or disable barriers, for
consistency with other ext3 mount options.
orlov (*) This enables the new Orlov block allocator. It is
enabled by default.
......@@ -653,8 +653,12 @@ static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
seq_printf(seq, ",commit=%u",
(unsigned) (sbi->s_commit_interval / HZ));
if (test_opt(sb, BARRIER))
seq_puts(seq, ",barrier=1");
* Always display barrier state so it's clear what the status is.
seq_puts(seq, ",barrier=");
seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
if (test_opt(sb, NOBH))
seq_puts(seq, ",nobh");
......@@ -810,8 +814,8 @@ enum {
Opt_data_err_abort, Opt_data_err_ignore,
Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
Opt_noquota, Opt_ignore, Opt_barrier, Opt_err, Opt_resize,
Opt_usrquota, Opt_grpquota
Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
Opt_resize, Opt_usrquota, Opt_grpquota
static const match_table_t tokens = {
......@@ -865,6 +869,8 @@ static const match_table_t tokens = {
{Opt_quota, "quota"},
{Opt_usrquota, "usrquota"},
{Opt_barrier, "barrier=%u"},
{Opt_barrier, "barrier"},
{Opt_nobarrier, "nobarrier"},
{Opt_resize, "resize"},
{Opt_err, NULL},
......@@ -967,7 +973,11 @@ static int parse_options (char *options, struct super_block *sb,
int token;
if (!*p)
* Initialize args struct so we know whether arg was
* found; some options take optional arguments.
args[0].to = args[0].from = 0;
token = match_token(p, tokens, args);
switch (token) {
case Opt_bsd_df:
......@@ -1215,9 +1225,15 @@ set_qf_format:
case Opt_abort:
set_opt(sbi->s_mount_opt, ABORT);
case Opt_nobarrier:
clear_opt(sbi->s_mount_opt, BARRIER);
case Opt_barrier:
if (match_int(&args[0], &option))
return 0;
if (args[0].from) {
if (match_int(&args[0], &option))
return 0;
} else
option = 1; /* No argument, default to 1 */
if (option)
set_opt(sbi->s_mount_opt, BARRIER);
......@@ -2276,6 +2292,9 @@ static int ext3_load_journal(struct super_block *sb,
return -EINVAL;
if (!(journal->j_flags & JFS_BARRIER))
printk(KERN_INFO "EXT3-fs: barriers not enabled\n");
if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
err = journal_update_format(journal);
if (err) {
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