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Subject[PATCH] improve reiserfs 2.4.x O_SYNC and fsync speed

Hi guys,

This patch has been lightly tested, I'd appreciate it if some of you
could try it out on data you don't care about. The idea is to
improve fsync and O_SYNC performance by only doing a commit on the last transaction the file was actually involved in. The old code always forced a commit of the current transaction, which is just about the slowest possible choice (but easy to verify as correct ;-)

(2.2.x reiserfs already has similar optimizations)

The words I want to stress here are data_you_don't_care_about. I'm looking
for benchmarks and impressions while I test here to make sure the logging rules are not being broken.

-chris
diff -Nru a/fs/reiserfs/dir.c b/fs/reiserfs/dir.c
--- a/fs/reiserfs/dir.c Mon Apr 30 12:45:15 2001
+++ b/fs/reiserfs/dir.c Mon Apr 30 12:45:15 2001
@@ -47,22 +47,10 @@
};

int reiserfs_dir_fsync(struct file *filp, struct dentry *dentry, int datasync) {
- int ret = 0 ;
- int windex ;
- struct reiserfs_transaction_handle th ;
-
lock_kernel();
-
- journal_begin(&th, dentry->d_inode->i_sb, 1) ;
- windex = push_journal_writer("dir_fsync") ;
- reiserfs_prepare_for_journal(th.t_super, SB_BUFFER_WITH_SB(th.t_super), 1) ;
- journal_mark_dirty(&th, dentry->d_inode->i_sb, SB_BUFFER_WITH_SB (dentry->d_inode->i_sb)) ;
- pop_journal_writer(windex) ;
- journal_end_sync(&th, dentry->d_inode->i_sb, 1) ;
-
- unlock_kernel();
-
- return ret ;
+ reiserfs_commit_for_inode(dentry->d_inode) ;
+ unlock_kernel() ;
+ return 0 ;
}


diff -Nru a/fs/reiserfs/file.c b/fs/reiserfs/file.c
--- a/fs/reiserfs/file.c Mon Apr 30 12:45:15 2001
+++ b/fs/reiserfs/file.c Mon Apr 30 12:45:15 2001
@@ -50,6 +50,7 @@
lock_kernel() ;
down (&inode->i_sem);
journal_begin(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT * 3) ;
+ reiserfs_update_inode_transaction(inode) ;

#ifdef REISERFS_PREALLOCATE
reiserfs_discard_prealloc (&th, inode);
@@ -83,10 +84,7 @@
int datasync
) {
struct inode * p_s_inode = p_s_dentry->d_inode;
- struct reiserfs_transaction_handle th ;
int n_err;
- int windex ;
- int jbegin_count = 1 ;

lock_kernel() ;

@@ -95,14 +93,12 @@

n_err = fsync_inode_buffers(p_s_inode) ;
n_err |= fsync_inode_data_buffers(p_s_inode);
+
/* commit the current transaction to flush any metadata
** changes. sys_fsync takes care of flushing the dirty pages for us
*/
- journal_begin(&th, p_s_inode->i_sb, jbegin_count) ;
- windex = push_journal_writer("sync_file") ;
- reiserfs_update_sd(&th, p_s_inode);
- pop_journal_writer(windex) ;
- journal_end_sync(&th, p_s_inode->i_sb,jbegin_count) ;
+ reiserfs_commit_for_inode(p_s_inode) ;
+
unlock_kernel() ;
return ( n_err < 0 ) ? -EIO : 0;
}
diff -Nru a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
--- a/fs/reiserfs/inode.c Mon Apr 30 12:45:15 2001
+++ b/fs/reiserfs/inode.c Mon Apr 30 12:45:15 2001
@@ -40,6 +40,7 @@
down (&inode->i_sem);

journal_begin(&th, inode->i_sb, jbegin_count) ;
+ reiserfs_update_inode_transaction(inode) ;
windex = push_journal_writer("delete_inode") ;

reiserfs_delete_object (&th, inode);
@@ -281,6 +282,7 @@
reiserfs_update_sd(th, inode) ;
journal_end(th, s, len) ;
journal_begin(th, s, len) ;
+ reiserfs_update_inode_transaction(inode) ;
}

// it is called by get_block when create == 0. Returns block number
@@ -604,6 +606,7 @@
TYPE_ANY, 3/*key length*/);
if ((new_offset + inode->i_sb->s_blocksize) >= inode->i_size) {
journal_begin(&th, inode->i_sb, jbegin_count) ;
+ reiserfs_update_inode_transaction(inode) ;
transaction_started = 1 ;
}
research:
@@ -628,6 +631,7 @@
if (!transaction_started) {
pathrelse(&path) ;
journal_begin(&th, inode->i_sb, jbegin_count) ;
+ reiserfs_update_inode_transaction(inode) ;
transaction_started = 1 ;
goto research ;
}
@@ -704,6 +708,7 @@
*/
pathrelse(&path) ;
journal_begin(&th, inode->i_sb, jbegin_count) ;
+ reiserfs_update_inode_transaction(inode) ;
transaction_started = 1 ;
goto research;
}
@@ -1296,6 +1301,10 @@
return ;
}
lock_kernel() ;
+
+ /* this is really only used for atime updates, so they don't have
+ ** to be included in O_SYNC or fsync
+ */
journal_begin(&th, inode->i_sb, 1) ;
reiserfs_update_sd (&th, inode);
journal_end(&th, inode->i_sb, 1) ;
@@ -1660,6 +1669,7 @@
*/
prevent_flush_page_lock(page, p_s_inode) ;
journal_begin(&th, p_s_inode->i_sb, JOURNAL_PER_BALANCE_CNT * 2 ) ;
+ reiserfs_update_inode_transaction(p_s_inode) ;
windex = push_journal_writer("reiserfs_vfs_truncate_file") ;
reiserfs_do_truncate (&th, p_s_inode, page, update_timestamps) ;
pop_journal_writer(windex) ;
@@ -1708,6 +1718,7 @@
lock_kernel() ;
prevent_flush_page_lock(bh_result->b_page, inode) ;
journal_begin(&th, inode->i_sb, jbegin_count) ;
+ reiserfs_update_inode_transaction(inode) ;

make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3) ;

@@ -1941,21 +1952,32 @@
unsigned from, unsigned to) {
struct inode *inode = page->mapping->host ;
int ret ;
+ loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to ;
struct reiserfs_transaction_handle th ;

reiserfs_wait_on_write_block(inode->i_sb) ;
lock_kernel();
prevent_flush_page_lock(page, inode) ;
+
+ /* generic_commit_write does this for us, but does not update the
+ ** transaction tracking stuff when the size changes. So, we have
+ ** to do the i_size updates here.
+ */
+ if (pos > inode->i_size) {
+ journal_begin(&th, inode->i_sb, 1) ;
+ reiserfs_update_inode_transaction(inode) ;
+ inode->i_size = pos ;
+ reiserfs_update_sd(&th, inode) ;
+ journal_end(&th, inode->i_sb, 1) ;
+ }
+
ret = generic_commit_write(f, page, from, to) ;
+
/* we test for O_SYNC here so we can commit the transaction
** for any packed tails the file might have had
*/
if (f->f_flags & O_SYNC) {
- journal_begin(&th, inode->i_sb, 1) ;
- reiserfs_prepare_for_journal(inode->i_sb,
- SB_BUFFER_WITH_SB(inode->i_sb), 1) ;
- journal_mark_dirty(&th, inode->i_sb, SB_BUFFER_WITH_SB(inode->i_sb)) ;
- journal_end_sync(&th, inode->i_sb, 1) ;
+ reiserfs_commit_for_inode(inode) ;
}
allow_flush_page_lock(page, inode) ;
unlock_kernel();
diff -Nru a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
--- a/fs/reiserfs/journal.c Mon Apr 30 12:45:15 2001
+++ b/fs/reiserfs/journal.c Mon Apr 30 12:45:15 2001
@@ -2316,6 +2316,11 @@
** will wait until the current transaction is done/commited before returning
*/
int journal_end_sync(struct reiserfs_transaction_handle *th, struct super_block *p_s_sb, unsigned long nblocks) {
+
+ if (SB_JOURNAL(p_s_sb)->j_len == 0) {
+ reiserfs_prepare_for_journal(p_s_sb, SB_BUFFER_WITH_SB(p_s_sb), 1) ;
+ journal_mark_dirty(th, p_s_sb, SB_BUFFER_WITH_SB(p_s_sb)) ;
+ }
return do_journal_end(th, p_s_sb, nblocks, COMMIT_NOW | WAIT) ;
}

@@ -2607,6 +2612,41 @@
}
}
return 0 ;
+}
+
+void reiserfs_update_inode_transaction(struct inode *inode) {
+
+ inode->u.reiserfs_i.i_trans_index = SB_JOURNAL_LIST_INDEX(inode->i_sb);
+
+ inode->u.reiserfs_i.i_trans_id = SB_JOURNAL(inode->i_sb)->j_trans_id ;
+}
+
+static int reiserfs_inode_in_this_transaction(struct inode *inode) {
+ if (inode->u.reiserfs_i.i_trans_id == SB_JOURNAL(inode->i_sb)->j_trans_id ||
+ inode->u.reiserfs_i.i_trans_id == 0) {
+ return 1;
+ }
+ return 0 ;
+}
+
+void reiserfs_commit_for_inode(struct inode *inode) {
+ struct reiserfs_journal_list *jl ;
+ struct reiserfs_transaction_handle th ;
+ struct super_block *sb = inode->i_sb ;
+
+ jl = SB_JOURNAL_LIST(sb) + inode->u.reiserfs_i.i_trans_index ;
+
+ /* is it from the current transaction, or from an unknown transaction? */
+ if (reiserfs_inode_in_this_transaction(inode)) {
+ journal_join(&th, sb, 1) ;
+ reiserfs_update_inode_transaction(inode) ;
+ journal_end_sync(&th, sb, 1) ;
+ } else if (jl->j_trans_id == inode->u.reiserfs_i.i_trans_id) {
+ flush_commit_list(sb, jl, 1) ;
+ }
+ /* if the transaction id does not match, this list is long since flushed
+ ** and we don't have to do anything here
+ */
}

void reiserfs_restore_prepared_buffer(struct super_block *p_s_sb,
diff -Nru a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c
--- a/fs/reiserfs/namei.c Mon Apr 30 12:45:15 2001
+++ b/fs/reiserfs/namei.c Mon Apr 30 12:45:15 2001
@@ -554,6 +554,8 @@
journal_end(&th, dir->i_sb, jbegin_count) ;
return retval;
}
+ reiserfs_update_inode_transaction(inode) ;
+ reiserfs_update_inode_transaction(dir) ;

inode->i_op = &reiserfs_file_inode_operations;
inode->i_fop = &reiserfs_file_operations;
@@ -613,6 +615,9 @@
//FIXME: needed for block and char devices only
reiserfs_update_sd (&th, inode);

+ reiserfs_update_inode_transaction(inode) ;
+ reiserfs_update_inode_transaction(dir) ;
+
retval = reiserfs_add_entry (&th, dir, dentry->d_name.name, dentry->d_name.len,
inode, 1/*visible*/);
if (retval) {
@@ -668,6 +673,8 @@
journal_end(&th, dir->i_sb, jbegin_count) ;
return retval;
}
+ reiserfs_update_inode_transaction(inode) ;
+ reiserfs_update_inode_transaction(dir) ;

inode->i_op = &reiserfs_dir_inode_operations;
inode->i_fop = &reiserfs_dir_operations;
@@ -736,6 +743,9 @@
}
inode = dentry->d_inode;

+ reiserfs_update_inode_transaction(inode) ;
+ reiserfs_update_inode_transaction(dir) ;
+
if (de.de_objectid != inode->i_ino) {
// FIXME: compare key of an object and a key found in the
// entry
@@ -809,6 +819,9 @@
}
inode = dentry->d_inode;

+ reiserfs_update_inode_transaction(inode) ;
+ reiserfs_update_inode_transaction(dir) ;
+
if (de.de_objectid != inode->i_ino) {
// FIXME: compare key of an object and a key found in the
// entry
@@ -898,6 +911,9 @@
return retval;
}

+ reiserfs_update_inode_transaction(inode) ;
+ reiserfs_update_inode_transaction(dir) ;
+
inode->i_op = &page_symlink_inode_operations;
inode->i_mapping->a_ops = &reiserfs_address_space_operations;

@@ -953,6 +969,10 @@
/* create new entry */
retval = reiserfs_add_entry (&th, dir, dentry->d_name.name, dentry->d_name.len,
inode, 1/*visible*/);
+
+ reiserfs_update_inode_transaction(inode) ;
+ reiserfs_update_inode_transaction(dir) ;
+
if (retval) {
pop_journal_writer(windex) ;
journal_end(&th, dir->i_sb, jbegin_count) ;
@@ -1098,6 +1118,10 @@
return retval;
}

+ reiserfs_update_inode_transaction(old_dir) ;
+ reiserfs_update_inode_transaction(new_dir) ;
+ if (new_inode)
+ reiserfs_update_inode_transaction(new_inode) ;

while (1) {
// look for old name using corresponding entry key (found by reiserfs_find_entry)
diff -Nru a/fs/reiserfs/stree.c b/fs/reiserfs/stree.c
--- a/fs/reiserfs/stree.c Mon Apr 30 12:45:15 2001
+++ b/fs/reiserfs/stree.c Mon Apr 30 12:45:15 2001
@@ -1932,6 +1932,7 @@

journal_end(th, p_s_inode->i_sb, orig_len_alloc) ;
journal_begin(th, p_s_inode->i_sb, orig_len_alloc) ;
+ reiserfs_update_inode_transaction(p_s_inode) ;
}
} while ( n_file_size > ROUND_UP (n_new_file_size) &&
search_for_position_by_key(p_s_inode->i_sb, &s_item_key, &s_search_path) == POSITION_FOUND ) ;
diff -Nru a/include/linux/reiserfs_fs.h b/include/linux/reiserfs_fs.h
--- a/include/linux/reiserfs_fs.h Mon Apr 30 12:45:15 2001
+++ b/include/linux/reiserfs_fs.h Mon Apr 30 12:45:15 2001
@@ -1599,6 +1599,8 @@
*/
#define JOURNAL_BUFFER(j,n) ((j)->j_ap_blocks[((j)->j_start + (n)) % JOURNAL_BLOCK_COUNT])

+void reiserfs_commit_for_inode(struct inode *) ;
+void reiserfs_update_inode_transaction(struct inode *) ;
void reiserfs_wait_on_write_block(struct super_block *s) ;
void reiserfs_block_writes(struct reiserfs_transaction_handle *th) ;
void reiserfs_allow_writes(struct super_block *s) ;
diff -Nru a/include/linux/reiserfs_fs_i.h b/include/linux/reiserfs_fs_i.h
--- a/include/linux/reiserfs_fs_i.h Mon Apr 30 12:45:15 2001
+++ b/include/linux/reiserfs_fs_i.h Mon Apr 30 12:45:15 2001
@@ -60,6 +60,12 @@
is a comment you should make.... -Hans */
//nopack-attribute
int nopack;
+
+ /* we use these for fsync or O_SYNC to decide which transaction needs
+ ** to be committed in order for this inode to be properly flushed
+ */
+ unsigned long i_trans_id ;
+ unsigned long i_trans_index ;
};


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