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ext4: Enable delalloc by default.

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Enable delalloc by default to ensure it gets sufficient testing and
because it makes the filesystem much more efficient.  Add a nodealalloc
option to disable delayed allocation, and update ext4_show_options to
show delayed allocation off if it is disabled.

If the data=journal mount option is used, disable delayed allocation
since the delalloc code doesn't support data=journal yet.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
This commit is contained in:
Aneesh Kumar K.V 2008-07-11 19:27:31 -04:00 committed by Theodore Ts'o
parent 3e3398a08d
commit dd919b9822
1 changed files with 22 additions and 1 deletions
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23
fs/ext4/super.c
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@ -756,6 +756,9 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
seq_puts(seq, ",nomballoc");
if (test_opt(sb, I_VERSION))
seq_puts(seq, ",i_version");
if (!test_opt(sb, DELALLOC))
seq_puts(seq, ",nodelalloc");
if (sbi->s_stripe)
seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
@ -903,7 +906,7 @@ enum {
Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
Opt_mballoc, Opt_nomballoc, Opt_stripe, Opt_delalloc,
Opt_mballoc, Opt_nomballoc, Opt_stripe, Opt_delalloc, Opt_nodelalloc,
};
static match_table_t tokens = {
@ -963,6 +966,7 @@ static match_table_t tokens = {
{Opt_stripe, "stripe=%u"},
{Opt_resize, "resize"},
{Opt_delalloc, "delalloc"},
{Opt_nodelalloc, "nodelalloc"},
{Opt_err, NULL},
};
@ -1328,6 +1332,9 @@ set_qf_format:
set_opt(sbi->s_mount_opt, I_VERSION);
sb->s_flags |= MS_I_VERSION;
break;
case Opt_nodelalloc:
clear_opt(sbi->s_mount_opt, DELALLOC);
break;
case Opt_mballoc:
set_opt(sbi->s_mount_opt, MBALLOC);
break;
@ -1984,6 +1991,13 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
*/
set_opt(sbi->s_mount_opt, MBALLOC);
/*
* enable delayed allocation by default
* Use -o nodelalloc to turn it off
*/
set_opt(sbi->s_mount_opt, DELALLOC);
if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
NULL, 0))
goto failed_mount;
@ -2422,6 +2436,13 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
"writeback");
if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
"requested data journaling mode\n");
clear_opt(sbi->s_mount_opt, DELALLOC);
} else if (test_opt(sb, DELALLOC))
printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
ext4_ext_init(sb);
ext4_mb_init(sb, needs_recovery);