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btrfs: add mount option to set commit interval

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I'ts hardcoded to 30 seconds which is fine for most users. Higher values
defer data being synced to permanent storage with obvious consequences
when the system crashes. The upper bound is not forced, but a warning is
printed if it's more than 300 seconds (5 minutes).

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
David Sterba
2013-08-01 18:14:52 +02:00
committed by Chris Mason
parent 9ec7267751
commit 8b87dc17fb
3 changed files with 34 additions and 2 deletions
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27
fs/btrfs/super.c
View File

@ -321,6 +321,7 @@ enum {
Opt_no_space_cache, Opt_recovery, Opt_skip_balance,
Opt_check_integrity, Opt_check_integrity_including_extent_data,
Opt_check_integrity_print_mask, Opt_fatal_errors,
Opt_commit_interval,
Opt_err,
};
@ -361,6 +362,7 @@ static match_table_t tokens = {
{Opt_check_integrity_including_extent_data, "check_int_data"},
{Opt_check_integrity_print_mask, "check_int_print_mask=%d"},
{Opt_fatal_errors, "fatal_errors=%s"},
{Opt_commit_interval, "commit=%d"},
{Opt_err, NULL},
};
@ -645,6 +647,29 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
goto out;
}
break;
case Opt_commit_interval:
intarg = 0;
ret = match_int(&args[0], &intarg);
if (ret < 0) {
printk(KERN_ERR
"btrfs: invalid commit interval\n");
ret = -EINVAL;
goto out;
}
if (intarg > 0) {
if (intarg > 300) {
printk(KERN_WARNING
"btrfs: excessive commit interval %d\n",
intarg);
}
info->commit_interval = intarg;
} else {
printk(KERN_INFO
"btrfs: using default commit interval %ds\n",
BTRFS_DEFAULT_COMMIT_INTERVAL);
info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
}
break;
case Opt_err:
printk(KERN_INFO "btrfs: unrecognized mount option "
"'%s'\n", p);
@ -981,6 +1006,8 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
info->metadata_ratio);
if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR))
seq_puts(seq, ",fatal_errors=panic");
if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL)
seq_printf(seq, ",commit=%d", info->commit_interval);
return 0;
}