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authorFrank Mayhar <fmayhar@google.com>2009-01-07 00:06:22 -0500
committerTheodore Ts'o <tytso@mit.edu>2009-01-07 00:06:22 -0500
commit0390131ba84fd3f726f9e24fc4553828125700bb (patch)
tree4c90afad4e8690e25aec0ce069fd450e92ab5f96 /fs/ext4/mballoc.c
parentff7ef329b268b603ea4a2303241ef1c3829fd574 (diff)
downloadlwn-0390131ba84fd3f726f9e24fc4553828125700bb.tar.gz
lwn-0390131ba84fd3f726f9e24fc4553828125700bb.zip
ext4: Allow ext4 to run without a journal
A few weeks ago I posted a patch for discussion that allowed ext4 to run without a journal. Since that time I've integrated the excellent comments from Andreas and fixed several serious bugs. We're currently running with this patch and generating some performance numbers against both ext2 (with backported reservations code) and ext4 with and without a journal. It just so happens that running without a journal is slightly faster for most everything. We did iozone -T -t 4 s 2g -r 256k -T -I -i0 -i1 -i2 which creates 4 threads, each of which create and do reads and writes on a 2G file, with a buffer size of 256K, using O_DIRECT for all file opens to bypass the page cache. Results: ext2 ext4, default ext4, no journal initial writes 13.0 MB/s 15.4 MB/s 15.7 MB/s rewrites 13.1 MB/s 15.6 MB/s 15.9 MB/s reads 15.2 MB/s 16.9 MB/s 17.2 MB/s re-reads 15.3 MB/s 16.9 MB/s 17.2 MB/s random readers 5.6 MB/s 5.6 MB/s 5.7 MB/s random writers 5.1 MB/s 5.3 MB/s 5.4 MB/s So it seems that, so far, this was a useful exercise. Signed-off-by: Frank Mayhar <fmayhar@google.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/mballoc.c')
-rw-r--r--fs/ext4/mballoc.c17
1 files changed, 9 insertions, 8 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 7beab7141dd5..edb512b2ec49 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2553,7 +2553,8 @@ int ext4_mb_init(struct super_block *sb, int needs_recovery)
ext4_mb_init_per_dev_proc(sb);
ext4_mb_history_init(sb);
- sbi->s_journal->j_commit_callback = release_blocks_on_commit;
+ if (sbi->s_journal)
+ sbi->s_journal->j_commit_callback = release_blocks_on_commit;
printk(KERN_INFO "EXT4-fs: mballoc enabled\n");
return 0;
@@ -2854,7 +2855,7 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
mb_set_bits(sb_bgl_lock(sbi, ac->ac_b_ex.fe_group),
bitmap_bh->b_data, ac->ac_b_ex.fe_start,
ac->ac_b_ex.fe_len);
- err = ext4_journal_dirty_metadata(handle, bitmap_bh);
+ err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);
if (!err)
err = -EAGAIN;
goto out_err;
@@ -2901,10 +2902,10 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
spin_unlock(sb_bgl_lock(sbi, flex_group));
}
- err = ext4_journal_dirty_metadata(handle, bitmap_bh);
+ err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);
if (err)
goto out_err;
- err = ext4_journal_dirty_metadata(handle, gdp_bh);
+ err = ext4_handle_dirty_metadata(handle, NULL, gdp_bh);
out_err:
sb->s_dirt = 1;
@@ -4414,7 +4415,7 @@ ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b,
struct rb_node **n = &db->bb_free_root.rb_node, *node;
struct rb_node *parent = NULL, *new_node;
-
+ BUG_ON(!ext4_handle_valid(handle));
BUG_ON(e4b->bd_bitmap_page == NULL);
BUG_ON(e4b->bd_buddy_page == NULL);
@@ -4600,7 +4601,7 @@ do_more:
/* We dirtied the bitmap block */
BUFFER_TRACE(bitmap_bh, "dirtied bitmap block");
- err = ext4_journal_dirty_metadata(handle, bitmap_bh);
+ err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);
if (ac) {
ac->ac_b_ex.fe_group = block_group;
@@ -4609,7 +4610,7 @@ do_more:
ext4_mb_store_history(ac);
}
- if (metadata) {
+ if (metadata && ext4_handle_valid(handle)) {
/* blocks being freed are metadata. these blocks shouldn't
* be used until this transaction is committed */
ext4_mb_free_metadata(handle, &e4b, block_group, bit, count);
@@ -4639,7 +4640,7 @@ do_more:
/* And the group descriptor block */
BUFFER_TRACE(gd_bh, "dirtied group descriptor block");
- ret = ext4_journal_dirty_metadata(handle, gd_bh);
+ ret = ext4_handle_dirty_metadata(handle, NULL, gd_bh);
if (!err)
err = ret;