Hi,
Thanks for that SysRq tip. Now I am able to get some logs.
From OOPS message, it showed an assertion failure on
J_ASSERT_JH(jh, jh->b_transaction ==
journal->j_committing_transaction);
In my code, I've modified journal_commit_transaction such that it
collects all buffer_head in a linked list, with their corresponding
buffer numbers in other list.
I collect all buffers (data + metadata ) and push them all
simultaneously and pass list of block numbers through a special ioctl call.
The problem that I see in my code is that all buffers are handled in
same way as all data buffers in original code. ie metadata buffers are
getting unfiled instead of refiling.
I am attaching my patch. Please can you see and check if that indeed is
problem here?
Also what can be possible solution to it? separation of buffers in 2
list (data, metadata) and handling them separately?
(Being a kernel noob, my coding does not conform to any standard. So
please point out any blunders I've committed in my patch)
Thank You
Niraj
diff -ur ./commit.c /home/srimugunthan/niraj/linux_kernel/linux-2.6.38.6/fs/jbd/commit.c
--- ./commit.c 2011-05-10 03:46:23.000000000 +0530
+++ /home/srimugunthan/niraj/linux_kernel/linux-2.6.38.6/fs/jbd/commit.c 2011-06-22 22:53:39.641366902 +0530
@@ -21,6 +21,17 @@
#include <linux/pagemap.h>
#include <linux/bio.h>
+#include <linux/mtd/blktrans.h>
+#ifdef TXFLASH
+#include <linux/genhd.h>
+#include <linux/blkdev.h>
+#endif
+
+struct BLK_CHAIN{
+ struct list_head list;
+ struct buffer_head *bh;
+};
+static struct BLK_CHAIN blk_chain;
/*
* Default IO end handler for temporary BJ_IO buffer_heads.
*/
@@ -152,11 +163,10 @@
int write_op)
{
int i;
for (i = 0; i < bufs; i++) {
wbuf[i]->b_end_io = end_buffer_write_sync;
/* We use-up our safety reference in submit_bh() */
- submit_bh(write_op, wbuf[i]);
+ //submit_bh(write_op, wbuf[i]);
}
}
@@ -165,7 +175,12 @@
*/
static int journal_submit_data_buffers(journal_t *journal,
transaction_t *commit_transaction,
- int write_op)
+ int write_op
+#ifdef TXFLASH
+ ,struct mtd_flash_txn *mytxn,int *data_cnt
+#endif
+ )
+
{
struct journal_head *jh;
struct buffer_head *bh;
@@ -173,6 +188,10 @@
int bufs = 0;
struct buffer_head **wbuf = journal->j_wbuf;
int err = 0;
+#ifdef TXFLASH
+ struct mtd_txn_blk *new_entry=NULL;
+ struct BLK_CHAIN *new_blk_entry=NULL;
+#endif
/*
* Whenever we unlock the journal and sleep, things can get added
@@ -200,11 +220,24 @@
* blocking lock_buffer().
*/
if (buffer_dirty(bh)) {
- if (!trylock_buffer(bh)) {
+#ifdef TXFLASH
+ {
+ BUFFER_TRACE(bh, "needs blocking lock");
+ spin_unlock(&journal->j_list_lock);
+ /* Write out all data to prevent deadlocks */
+ if(bufs>0)
+ journal_do_submit_data(wbuf, bufs, write_op);
+ if(!new_entry)
+ new_entry=(struct mtd_txn_blk *)kzalloc(sizeof(struct mtd_txn_blk),GFP_KERNEL);
+ if(!new_blk_entry)
+ new_blk_entry=(struct BLK_CHAIN *)kzalloc(sizeof(struct BLK_CHAIN),GFP_KERNEL);
+#else
+ if (!trylock_buffer(bh)) {
BUFFER_TRACE(bh, "needs blocking lock");
spin_unlock(&journal->j_list_lock);
/* Write out all data to prevent deadlocks */
journal_do_submit_data(wbuf, bufs, write_op);
+#endif
bufs = 0;
lock_buffer(bh);
spin_lock(&journal->j_list_lock);
@@ -230,6 +263,21 @@
if (locked && test_clear_buffer_dirty(bh)) {
BUFFER_TRACE(bh, "needs writeout, adding to array");
wbuf[bufs++] = bh;
+#ifdef TXFLASH
+ (*data_cnt)++;
+ if(new_entry){
+ new_entry->blk_no=bh->b_blocknr;
+ list_add_tail(&(new_entry->list),&(mytxn->blks));
+ new_entry=NULL;
+ jbd_debug(3, "JBD submit data buffer at insertion point %lX of size %lX\n",bh->b_blocknr,bh->b_size);
+ }
+ if(new_blk_entry)
+ {
+ new_blk_entry->bh=bh;
+ list_add_tail(&(new_blk_entry->list),&(blk_chain.list));
+ new_blk_entry=NULL;
+ }
+#endif
__journal_file_buffer(jh, commit_transaction,
BJ_Locked);
jbd_unlock_bh_state(bh);
@@ -265,11 +313,14 @@
}
}
spin_unlock(&journal->j_list_lock);
journal_do_submit_data(wbuf, bufs, write_op);
return err;
}
+
+#ifndef TXFLASH
/*
* journal_commit_transaction
*
@ -952,3 +1006,786 @@
wake_up(&journal->j_wait_done_commit);
}
+#else
+/*
+ * Transactional Version
+ */
+void journal_commit_transaction(journal_t *journal)
+{
+ transaction_t *commit_transaction;
+ struct journal_head *jh, *new_jh, *descriptor;
+ struct buffer_head **wbuf = journal->j_wbuf;
+ int bufs;
+ int flags;
+ int err;
+ unsigned int blocknr;
+ ktime_t start_time;
+ u64 commit_time;
+ char *tagp = NULL;
+ journal_header_t *header;
+ journal_block_tag_t *tag = NULL;
+ int space_left = 0;
+ int first_tag = 0;
+ int tag_flag;
+ int i;
+ int write_op = WRITE_SYNC;
+
+ struct mtd_flash_txn *mytxn;
+ struct mtd_txn_blk *pos,*tmp_pos;
+ struct BLK_CHAIN *new_blk_pos,*tmp_blk_pos;
+ int descriptor_counter,data_counter,meta_counter;
+ struct buffer_head *my_desc_buf=NULL;
+ /*
+ * First job: lock down the current transaction and wait for
+ * all outstanding updates to complete.
+ */
+
+ descriptor_counter=0;
+ data_counter=0;
+ meta_counter=0;
+#ifdef COMMIT_STATS
+ spin_lock(&journal->j_list_lock);
+ summarise_journal_usage(journal);
+ spin_unlock(&journal->j_list_lock);
+#endif
+
+ /* Do we need to erase the effects of a prior journal_flush? */
+ if (journal->j_flags & JFS_FLUSHED) {
+ jbd_debug(3, "super block updated\n");
+ journal_update_superblock(journal, 1);
+ } else {
+ jbd_debug(3, "superblock not updated\n");
+ }
+
+ J_ASSERT(journal->j_running_transaction != NULL);
+ J_ASSERT(journal->j_committing_transaction == NULL);
+
+ commit_transaction = journal->j_running_transaction;
+ J_ASSERT(commit_transaction->t_state == T_RUNNING);
+
+ jbd_debug(1, "JBD: starting commit of transaction %d\n",
+ commit_transaction->t_tid);
+
+ mytxn=(struct mtd_flash_txn*)kmalloc(sizeof(struct mtd_flash_txn),GFP_KERNEL);
+ INIT_LIST_HEAD(&(mytxn->blks));
+ mytxn->txn_number=commit_transaction->t_tid;
+ mytxn->bh_size=0;
+
+ INIT_LIST_HEAD(&(blk_chain.list));
+ blk_chain.bh=0;
+
+
+ spin_lock(&journal->j_state_lock);
+ commit_transaction->t_state = T_LOCKED;
+
+ /*
+ * Use plugged writes here, since we want to submit several before
+ * we unplug the device. We don't do explicit unplugging in here,
+ * instead we rely on sync_buffer() doing the unplug for us.
+ */
+ if (commit_transaction->t_synchronous_commit)
+ write_op = WRITE_SYNC_PLUG;
+ spin_lock(&commit_transaction->t_handle_lock);
+ while (commit_transaction->t_updates) {
+ DEFINE_WAIT(wait);
+
+ prepare_to_wait(&journal->j_wait_updates, &wait,
+ TASK_UNINTERRUPTIBLE);
+ if (commit_transaction->t_updates) {
+ spin_unlock(&commit_transaction->t_handle_lock);
+ spin_unlock(&journal->j_state_lock);
+ schedule();
+ spin_lock(&journal->j_state_lock);
+ spin_lock(&commit_transaction->t_handle_lock);
+ }
+ finish_wait(&journal->j_wait_updates, &wait);
+ }
+ spin_unlock(&commit_transaction->t_handle_lock);
+
+ J_ASSERT (commit_transaction->t_outstanding_credits <=
+ journal->j_max_transaction_buffers);
+
+ /*
+ * First thing we are allowed to do is to discard any remaining
+ * BJ_Reserved buffers. Note, it is _not_ permissible to assume
+ * that there are no such buffers: if a large filesystem
+ * operation like a truncate needs to split itself over multiple
+ * transactions, then it may try to do a journal_restart() while
+ * there are still BJ_Reserved buffers outstanding. These must
+ * be released cleanly from the current transaction.
+ *
+ * In this case, the filesystem must still reserve write access
+ * again before modifying the buffer in the new transaction, but
+ * we do not require it to remember exactly which old buffers it
+ * has reserved. This is consistent with the existing behaviour
+ * that multiple journal_get_write_access() calls to the same
+ * buffer are perfectly permissable.
+ */
+ while (commit_transaction->t_reserved_list) {
+ jh = commit_transaction->t_reserved_list;
+ JBUFFER_TRACE(jh, "reserved, unused: refile");
+ /*
+ * A journal_get_undo_access()+journal_release_buffer() may
+ * leave undo-committed data.
+ */
+ if (jh->b_committed_data) {
+ struct buffer_head *bh = jh2bh(jh);
+
+ jbd_lock_bh_state(bh);
+ jbd_free(jh->b_committed_data, bh->b_size);
+ jh->b_committed_data = NULL;
+ jbd_unlock_bh_state(bh);
+ }
+ journal_refile_buffer(journal, jh);
+ }
+
+ /*
+ * Now try to drop any written-back buffers from the journal's
+ * checkpoint lists. We do this *before* commit because it potentially
+ * frees some memory
+ */
+ spin_lock(&journal->j_list_lock);
+ __journal_clean_checkpoint_list(journal);
+ spin_unlock(&journal->j_list_lock);
+
+ jbd_debug (3, "JBD: commit phase 1\n");
+
+ /*
+ * Switch to a new revoke table.
+ */
+ journal_switch_revoke_table(journal);
+
+ commit_transaction->t_state = T_FLUSH;
+ journal->j_committing_transaction = commit_transaction;
+ journal->j_running_transaction = NULL;
+ start_time = ktime_get();
+ commit_transaction->t_log_start = journal->j_head;
+ wake_up(&journal->j_wait_transaction_locked);
+ spin_unlock(&journal->j_state_lock);
+
+
+
+
+ jbd_debug (3, "JBD: commit phase 2\n");
+
+ /*
+ * Now start flushing things to disk, in the order they appear
+ * on the transaction lists. Data blocks go first.
+ */
+ err = journal_submit_data_buffers(journal, commit_transaction,
+ write_op,mytxn,&data_counter);
+
+ /*list_for_each_entry(pos,&mytxn.blks,list)
+ {
+ jbd_debug(3,"in jrnl commit blk no %lX",pos->blk_no);
+
+ }*/
+ //journal->j_dev->bd_disk->fops->ioctl(journal->j_dev,0777,CYCLIC_COMMIT,(unsigned long )&mytxn);
+
+#if 0
+ journal_write_revoke_records(journal, commit_transaction, write_op);
+#endif
+ /*
+ * Wait for all previously submitted IO to complete.
+ */
+
+
+ jbd_debug (3, "JBD: commit phase 3\n");
+
+ /*
+ * Way to go: we have now written out all of the data for a
+ * transaction! Now comes the tricky part: we need to write out
+ * metadata. Loop over the transaction's entire buffer list:
+ */
+ spin_lock(&journal->j_state_lock);
+ commit_transaction->t_state = T_COMMIT;
+ spin_unlock(&journal->j_state_lock);
+
+ J_ASSERT(commit_transaction->t_nr_buffers <=
+ commit_transaction->t_outstanding_credits);
+
+ descriptor = NULL;
+ bufs = 0;
+ pos=NULL;
+ new_blk_pos=NULL;
+ while (commit_transaction->t_buffers) {
+
+ /* Find the next buffer to be journaled... */
+
+ jh = commit_transaction->t_buffers;
+
+ if(!pos)
+ pos=(struct mtd_txn_blk*)kzalloc(sizeof(struct mtd_txn_blk),GFP_KERNEL);
+ if(!new_blk_pos)
+ new_blk_pos=(struct BLK_CHAIN *)kzalloc(sizeof(struct BLK_CHAIN),GFP_KERNEL);
+
+ /* If we're in abort mode, we just un-journal the buffer and
+ release it. */
+
+ if (is_journal_aborted(journal)) {
+ clear_buffer_jbddirty(jh2bh(jh));
+ JBUFFER_TRACE(jh, "journal is aborting: refile");
+ journal_refile_buffer(journal, jh);
+ /* If that was the last one, we need to clean up
+ * any descriptor buffers which may have been
+ * already allocated, even if we are now
+ * aborting. */
+ if (!commit_transaction->t_buffers)
+ goto start_journal_io;
+ continue;
+ }
+
+ /* Make sure we have a descriptor block in which to
+ record the metadata buffer. */
+ /*Obselete for TXFLASH */
+#if 0
+ if (!descriptor) {
+ struct buffer_head *bh;
+
+ J_ASSERT (bufs == 0);
+
+ jbd_debug(4, "JBD: get descriptor\n");
+
+ descriptor = journal_get_descriptor_buffer(journal);
+ if (!descriptor) {
+ journal_abort(journal, -EIO);
+ continue;
+ }
+
+ bh = jh2bh(descriptor);
+ jbd_debug(4, "JBD: got buffer %llu %llX (%p)\n",
+ (unsigned long long)bh->b_blocknr,
+ (unsigned long long)bh->b_blocknr, bh->b_data);
+ header = (journal_header_t *)&bh->b_data[0];
+ header->h_magic = cpu_to_be32(JFS_MAGIC_NUMBER);
+ header->h_blocktype = cpu_to_be32(JFS_DESCRIPTOR_BLOCK);
+ header->h_sequence = cpu_to_be32(commit_transaction->t_tid);
+
+ tagp = &bh->b_data[sizeof(journal_header_t)];
+ space_left = bh->b_size - sizeof(journal_header_t);
+ first_tag = 1;
+ set_buffer_jwrite(bh);
+ set_buffer_dirty(bh);
+ wbuf[bufs++] = bh;
+ my_desc_buf=bh;
+
+ descriptor_counter++;
+ /* Record it so that we can wait for IO
+ completion later */
+ BUFFER_TRACE(bh, "ph3: file as descriptor");
+ journal_file_buffer(descriptor, commit_transaction,
+ BJ_LogCtl);
+ }
+#endif
+ /* Where is the buffer to be written? */
+#if 0
+ err = journal_next_log_block(journal, &blocknr);
+ /* If the block mapping failed, just abandon the buffer
+ and repeat this loop: we'll fall into the
+ refile-on-abort condition above. */
+ if (err) {
+ journal_abort(journal, err);
+ continue;
+ }
+#endif
+ /*
+ * start_this_handle() uses t_outstanding_credits to determine
+ * the free space in the log, but this counter is changed
+ * by journal_next_log_block() also.
+ */
+ commit_transaction->t_outstanding_credits--;
+
+ /* Bump b_count to prevent truncate from stumbling over
+ the shadowed buffer! @@@ This can go if we ever get
+ rid of the BJ_IO/BJ_Shadow pairing of buffers. */
+ get_bh(jh2bh(jh));
+
+ /* Make a temporary IO buffer with which to write it out
+ (this will requeue both the metadata buffer and the
+ temporary IO buffer). new_bh goes on BJ_IO*/
+
+ set_buffer_jwrite(jh2bh(jh));
+ /*
+ * akpm: journal_write_metadata_buffer() sets
+ * new_bh->b_transaction to commit_transaction.
+ * We need to clean this up before we release new_bh
+ * (which is of type BJ_IO)
+ */
+ JBUFFER_TRACE(jh, "ph3: write metadata");
+#if 0
+ flags = journal_write_metadata_buffer(commit_transaction,
+ jh, &new_jh, blocknr);
+#endif
+ journal_file_buffer(jh,commit_transaction,BJ_Locked);
+ set_buffer_jwrite(jh2bh(jh));
+ wbuf[bufs++] = jh2bh(jh);
+ meta_counter++;
+
+ if(!mytxn->bh_size)
+ {
+ mytxn->bh_size=(jh2bh(jh))->b_size;
+ }
+
+ if(pos){
+ pos->blk_no=(jh2bh(jh))->b_blocknr;
+ list_add_tail(&(pos->list),&(mytxn->blks));
+ pos=NULL;
+ jbd_debug(3, "JBD submit metadata buffer at insertion point %lX of size %lX\n",(jh2bh(jh))->b_blocknr,(jh2bh(jh))->b_size);
+ }
+ if(new_blk_pos)
+ {
+ new_blk_pos->bh=(jh2bh(jh));
+ list_add_tail(&(new_blk_pos->list),&(blk_chain.list));
+ new_blk_pos=NULL;
+ }
+
+
+ /* Record the new block's tag in the current descriptor
+ buffer */
+
+#if 0
+ tag_flag = 0;
+ if (flags & 1)
+ tag_flag |= JFS_FLAG_ESCAPE;
+ if (!first_tag)
+ tag_flag |= JFS_FLAG_SAME_UUID;
+
+ tag = (journal_block_tag_t *) tagp;
+ tag->t_blocknr = cpu_to_be32(jh2bh(jh)->b_blocknr);
+ tag->t_flags = cpu_to_be32(tag_flag);
+ tagp += sizeof(journal_block_tag_t);
+ space_left -= sizeof(journal_block_tag_t);
+
+ if (first_tag) {
+ memcpy (tagp, journal->j_uuid, 16);
+ tagp += 16;
+ space_left -= 16;
+ first_tag = 0;
+ }
+#endif
+ /* If there's no more to do, or if the descriptor is full,
+ let the IO rip! */
+
+ if (bufs == journal->j_wbufsize ||
+ commit_transaction->t_buffers == NULL
+#if 0
+ /*||
+ space_left < sizeof(journal_block_tag_t) + 16*/
+#endif
+ ) {
+
+ jbd_debug(4, "JBD: Submit %d IOs\n", bufs);
+
+ /* Write an end-of-descriptor marker before
+ submitting the IOs. "tag" still points to
+ the last tag we set up. */
+#if 0
+ tag->t_flags |= cpu_to_be32(JFS_FLAG_LAST_TAG);
+#endif
+ /* nk : Submit descriptor buffer now only since not recorded in blk chain*/
+
+
+start_journal_io:
+ for (i = 0; i < bufs; i++) {
+ struct buffer_head *bh = wbuf[i];
+ lock_buffer(bh);
+ clear_buffer_dirty(bh);
+ set_buffer_uptodate(bh);
+ bh->b_end_io = journal_end_buffer_io_sync;
+ jbd_debug(3, "JBD: submitting metadata buffer %lX of size %lX",bh->b_blocknr,bh->b_size);
+#if 0
+ submit_bh(write_op, bh);
+#endif
+ }
+#if 0
+ submit_bh(write_op, my_desc_buf);
+#endif
+ cond_resched();
+
+ /* Force a new descriptor to be generated next
+ time round the loop. */
+ descriptor = NULL;
+ bufs = 0;
+ }
+ }
+ /* nk : Send txn first and then buffer */
+ jbd_debug(1, "JBD: submitting TXFLASH\n");
+ journal->j_dev->bd_disk->fops->ioctl(journal->j_dev,0777,CYCLIC_COMMIT,(unsigned long )mytxn);
+ list_for_each_entry_safe(new_blk_pos,tmp_blk_pos,&(blk_chain.list),list)
+ {
+ submit_bh(write_op,new_blk_pos->bh);
+ list_del(&(new_blk_pos->list));
+ kfree(new_blk_pos);
+
+ }
+ jbd_debug(3, "JBD: submitted %d descriptors %d data and %d metadata totalling %d and 1 commit record\n", descriptor_counter
+ ,data_counter,meta_counter,descriptor_counter+data_counter+meta_counter);
+ /* Lo and behold: we have just managed to send a transaction to
+ the log. Before we can commit it, wait for the IO so far to
+ complete. Control buffers being written are on the
+ transaction's t_log_list queue, and metadata buffers are on
+ the t_iobuf_list queue.
+
+ Wait for the buffers in reverse order. That way we are
+ less likely to be woken up until all IOs have completed, and
+ so we incur less scheduling load.
+ */
+/*****************************************************************************************/
+ spin_lock(&journal->j_list_lock);
+ while (commit_transaction->t_locked_list) {
+ struct buffer_head *bh;
+
+ jh = commit_transaction->t_locked_list->b_tprev;
+ bh = jh2bh(jh);
+ get_bh(bh);
+ if (buffer_locked(bh)) {
+ spin_unlock(&journal->j_list_lock);
+ wait_on_buffer(bh);
+ spin_lock(&journal->j_list_lock);
+ }
+ if (unlikely(!buffer_uptodate(bh))) {
+ if (!trylock_page(bh->b_page)) {
+ spin_unlock(&journal->j_list_lock);
+ lock_page(bh->b_page);
+ spin_lock(&journal->j_list_lock);
+ }
+ if (bh->b_page->mapping)
+ set_bit(AS_EIO, &bh->b_page->mapping->flags);
+
+ unlock_page(bh->b_page);
+ SetPageError(bh->b_page);
+ err = -EIO;
+ }
+ if (!inverted_lock(journal, bh)) {
+ put_bh(bh);
+ spin_lock(&journal->j_list_lock);
+ continue;
+ }
+ if (buffer_jbd(bh) && bh2jh(bh) == jh &&
+ jh->b_transaction == commit_transaction &&
+ jh->b_jlist == BJ_Locked) {
+ __journal_unfile_buffer(jh);
+ jbd_unlock_bh_state(bh);
+ journal_remove_journal_head(bh);
+ put_bh(bh);
+ } else {
+ jbd_unlock_bh_state(bh);
+ }
+ release_data_buffer(bh);
+ cond_resched_lock(&journal->j_list_lock);
+ }
+ spin_unlock(&journal->j_list_lock);
+
+ if (err) {
+ char b[BDEVNAME_SIZE];
+
+ printk(KERN_WARNING
+ "JBD: Detected IO errors while flushing file data "
+ "on %s\n", bdevname(journal->j_fs_dev, b));
+ if (journal->j_flags & JFS_ABORT_ON_SYNCDATA_ERR)
+ journal_abort(journal, err);
+ err = 0;
+ }
+
+
+
+ /*
+ * If we found any dirty or locked buffers, then we should have
+ * looped back up to the write_out_data label. If there weren't
+ * any then journal_clean_data_list should have wiped the list
+ * clean by now, so check that it is in fact empty.
+ */
+ J_ASSERT (commit_transaction->t_sync_datalist == NULL);
+/**************************************************************************************** */
+
+
+ jbd_debug(3, "JBD: commit phase 4\n");
+
+ /*
+ * akpm: these are BJ_IO, and j_list_lock is not needed.
+ * See __journal_try_to_free_buffer.
+ */
+#if 0
+wait_for_iobuf:
+ while (commit_transaction->t_iobuf_list != NULL) {
+ struct buffer_head *bh;
+
+ jh = commit_transaction->t_iobuf_list->b_tprev;
+ bh = jh2bh(jh);
+ if (buffer_locked(bh)) {
+ wait_on_buffer(bh);
+ goto wait_for_iobuf;
+ }
+ if (cond_resched())
+ goto wait_for_iobuf;
+
+ if (unlikely(!buffer_uptodate(bh)))
+ err = -EIO;
+
+ clear_buffer_jwrite(bh);
+
+ JBUFFER_TRACE(jh, "ph4: unfile after journal write");
+ journal_unfile_buffer(journal, jh);
+
+ /*
+ * ->t_iobuf_list should contain only dummy buffer_heads
+ * which were created by journal_write_metadata_buffer().
+ */
+ BUFFER_TRACE(bh, "dumping temporary bh");
+ journal_put_journal_head(jh);
+ __brelse(bh);
+ J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0);
+ free_buffer_head(bh);
+
+ /* We also have to unlock and free the corresponding
+ shadowed buffer */
+ jh = commit_transaction->t_shadow_list->b_tprev;
+ bh = jh2bh(jh);
+ clear_buffer_jwrite(bh);
+ J_ASSERT_BH(bh, buffer_jbddirty(bh));
+
+ /* The metadata is now released for reuse, but we need
+ to remember it against this transaction so that when
+ we finally commit, we can do any checkpointing
+ required. */
+ JBUFFER_TRACE(jh, "file as BJ_Forget");
+ journal_file_buffer(jh, commit_transaction, BJ_Forget);
+ /* Wake up any transactions which were waiting for this
+ IO to complete */
+ wake_up_bit(&bh->b_state, BH_Unshadow);
+ JBUFFER_TRACE(jh, "brelse shadowed buffer");
+ __brelse(bh);
+ }
+#endif
+
+ J_ASSERT (commit_transaction->t_shadow_list == NULL);
+
+ jbd_debug(3, "JBD: commit phase 5\n");
+
+ /* Here we wait for the revoke record and descriptor record buffers */
+#if 0
+ wait_for_ctlbuf:
+ while (commit_transaction->t_log_list != NULL) {
+ struct buffer_head *bh;
+
+ jh = commit_transaction->t_log_list->b_tprev;
+ bh = jh2bh(jh);
+ if (buffer_locked(bh)) {
+ wait_on_buffer(bh);
+ goto wait_for_ctlbuf;
+ }
+ if (cond_resched())
+ goto wait_for_ctlbuf;
+
+ if (unlikely(!buffer_uptodate(bh)))
+ err = -EIO;
+
+ BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile");
+ clear_buffer_jwrite(bh);
+ journal_unfile_buffer(journal, jh);
+ journal_put_journal_head(jh);
+ __brelse(bh); /* One for getblk */
+ /* AKPM: bforget here */
+ }
+
+ if (err)
+ journal_abort(journal, err);
+#endif
+
+ jbd_debug(3, "JBD: commit phase 6\n");
+
+ /* All metadata is written, now write commit record and do cleanup */
+ spin_lock(&journal->j_state_lock);
+ J_ASSERT(commit_transaction->t_state == T_COMMIT);
+ commit_transaction->t_state = T_COMMIT_RECORD;
+ spin_unlock(&journal->j_state_lock);
+
+#if 0
+ if (journal_write_commit_record(journal, commit_transaction))
+ err = -EIO;
+
+ if (err)
+ journal_abort(journal, err);
+#endif
+ /* End of a transaction! Finally, we can do checkpoint
+ processing: any buffers committed as a result of this
+ transaction can be removed from any checkpoint list it was on
+ before. */
+
+ jbd_debug(3, "JBD: commit phase 7\n");
+
+ J_ASSERT(commit_transaction->t_sync_datalist == NULL);
+ J_ASSERT(commit_transaction->t_buffers == NULL);
+ J_ASSERT(commit_transaction->t_checkpoint_list == NULL);
+ J_ASSERT(commit_transaction->t_iobuf_list == NULL);
+ J_ASSERT(commit_transaction->t_shadow_list == NULL);
+ J_ASSERT(commit_transaction->t_log_list == NULL);
+
+restart_loop:
+ /*
+ * As there are other places (journal_unmap_buffer()) adding buffers
+ * to this list we have to be careful and hold the j_list_lock.
+ */
+ spin_lock(&journal->j_list_lock);
+ while (commit_transaction->t_forget) {
+ transaction_t *cp_transaction;
+ struct buffer_head *bh;
+
+ jh = commit_transaction->t_forget;
+ spin_unlock(&journal->j_list_lock);
+ bh = jh2bh(jh);
+ jbd_lock_bh_state(bh);
+ J_ASSERT_JH(jh, jh->b_transaction == commit_transaction ||
+ jh->b_transaction == journal->j_running_transaction);
+
+ /*
+ * If there is undo-protected committed data against
+ * this buffer, then we can remove it now. If it is a
+ * buffer needing such protection, the old frozen_data
+ * field now points to a committed version of the
+ * buffer, so rotate that field to the new committed
+ * data.
+ *
+ * Otherwise, we can just throw away the frozen data now.
+ */
+ if (jh->b_committed_data) {
+ jbd_free(jh->b_committed_data, bh->b_size);
+ jh->b_committed_data = NULL;
+ if (jh->b_frozen_data) {
+ jh->b_committed_data = jh->b_frozen_data;
+ jh->b_frozen_data = NULL;
+ }
+ } else if (jh->b_frozen_data) {
+ jbd_free(jh->b_frozen_data, bh->b_size);
+ jh->b_frozen_data = NULL;
+ }
+
+ spin_lock(&journal->j_list_lock);
+ cp_transaction = jh->b_cp_transaction;
+ if (cp_transaction) {
+ JBUFFER_TRACE(jh, "remove from old cp transaction");
+ __journal_remove_checkpoint(jh);
+ }
+
+ /* Only re-checkpoint the buffer_head if it is marked
+ * dirty. If the buffer was added to the BJ_Forget list
+ * by journal_forget, it may no longer be dirty and
+ * there's no point in keeping a checkpoint record for
+ * it. */
+
+ /* A buffer which has been freed while still being
+ * journaled by a previous transaction may end up still
+ * being dirty here, but we want to avoid writing back
+ * that buffer in the future after the "add to orphan"
+ * operation been committed, That's not only a performance
+ * gain, it also stops aliasing problems if the buffer is
+ * left behind for writeback and gets reallocated for another
+ * use in a different page. */
+ if (buffer_freed(bh) && !jh->b_next_transaction) {
+ clear_buffer_freed(bh);
+ clear_buffer_jbddirty(bh);
+ }
+
+ if (buffer_jbddirty(bh)) {
+ JBUFFER_TRACE(jh, "add to new checkpointing trans");
+ __journal_insert_checkpoint(jh, commit_transaction);
+ if (is_journal_aborted(journal))
+ clear_buffer_jbddirty(bh);
+ JBUFFER_TRACE(jh, "refile for checkpoint writeback");
+ __journal_refile_buffer(jh);
+ jbd_unlock_bh_state(bh);
+ } else {
+ J_ASSERT_BH(bh, !buffer_dirty(bh));
+ /* The buffer on BJ_Forget list and not jbddirty means
+ * it has been freed by this transaction and hence it
+ * could not have been reallocated until this
+ * transaction has committed. *BUT* it could be
+ * reallocated once we have written all the data to
+ * disk and before we process the buffer on BJ_Forget
+ * list. */
+ JBUFFER_TRACE(jh, "refile or unfile freed buffer");
+ __journal_refile_buffer(jh);
+ if (!jh->b_transaction) {
+ jbd_unlock_bh_state(bh);
+ /* needs a brelse */
+ journal_remove_journal_head(bh);
+ release_buffer_page(bh);
+ } else
+ jbd_unlock_bh_state(bh);
+ }
+ cond_resched_lock(&journal->j_list_lock);
+ }
+ spin_unlock(&journal->j_list_lock);
+ /*
+ * This is a bit sleazy. We use j_list_lock to protect transition
+ * of a transaction into T_FINISHED state and calling
+ * __journal_drop_transaction(). Otherwise we could race with
+ * other checkpointing code processing the transaction...
+ */
+ spin_lock(&journal->j_state_lock);
+ spin_lock(&journal->j_list_lock);
+ /*
+ * Now recheck if some buffers did not get attached to the transaction
+ * while the lock was dropped...
+ */
+ if (commit_transaction->t_forget) {
+ spin_unlock(&journal->j_list_lock);
+ spin_unlock(&journal->j_state_lock);
+ goto restart_loop;
+ }
+
+ /* Done with this transaction! */
+
+ jbd_debug(3, "JBD: commit phase 8\n");
+
+ J_ASSERT(commit_transaction->t_state == T_COMMIT_RECORD);
+
+ commit_transaction->t_state = T_FINISHED;
+ J_ASSERT(commit_transaction == journal->j_committing_transaction);
+ journal->j_commit_sequence = commit_transaction->t_tid;
+ journal->j_committing_transaction = NULL;
+ commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time));
+
+ /*
+ * weight the commit time higher than the average time so we don't
+ * react too strongly to vast changes in commit time
+ */
+ if (likely(journal->j_average_commit_time))
+ journal->j_average_commit_time = (commit_time*3 +
+ journal->j_average_commit_time) / 4;
+ else
+ journal->j_average_commit_time = commit_time;
+
+ spin_unlock(&journal->j_state_lock);
+
+ if (commit_transaction->t_checkpoint_list == NULL &&
+ commit_transaction->t_checkpoint_io_list == NULL) {
+ __journal_drop_transaction(journal, commit_transaction);
+ } else {
+ if (journal->j_checkpoint_transactions == NULL) {
+ journal->j_checkpoint_transactions = commit_transaction;
+ commit_transaction->t_cpnext = commit_transaction;
+ commit_transaction->t_cpprev = commit_transaction;
+ } else {
+ commit_transaction->t_cpnext =
+ journal->j_checkpoint_transactions;
+ commit_transaction->t_cpprev =
+ commit_transaction->t_cpnext->t_cpprev;
+ commit_transaction->t_cpnext->t_cpprev =
+ commit_transaction;
+ commit_transaction->t_cpprev->t_cpnext =
+ commit_transaction;
+ }
+ }
+ spin_unlock(&journal->j_list_lock);
+
+ jbd_debug(1, "JBD: commit %d complete, head %d\n",
+ journal->j_commit_sequence, journal->j_tail_sequence);
+
+ wake_up(&journal->j_wait_done_commit);
+}
+
+#endif
diff -ur ./journal.c /home/srimugunthan/niraj/linux_kernel/linux-2.6.38.6/fs/jbd/journal.c
--- ./journal.c 2011-05-10 03:46:23.000000000 +0530
+++ /home/srimugunthan/niraj/linux_kernel/linux-2.6.38.6/fs/jbd/journal.c 2011-06-22 14:24:21.551958448 +0530
@@ -40,6 +40,7 @@
#include <asm/uaccess.h>
#include <asm/page.h>
+#include <linux/mtd/blktrans.h>
EXPORT_SYMBOL(journal_start);
EXPORT_SYMBOL(journal_restart);
@@ -329,11 +330,13 @@
/*
* Check for escaping
*/
+#ifndef TXFLASH
if (*((__be32 *)(mapped_data + new_offset)) ==
cpu_to_be32(JFS_MAGIC_NUMBER)) {
need_copy_out = 1;
do_escape = 1;
}
+#endif
kunmap_atomic(mapped_data, KM_USER0);
/*
diff -ur ./recovery.c /home/srimugunthan/niraj/linux_kernel/linux-2.6.38.6/fs/jbd/recovery.c
--- ./recovery.c 2011-05-10 03:46:23.000000000 +0530
+++ /home/srimugunthan/niraj/linux_kernel/linux-2.6.38.6/fs/jbd/recovery.c 2011-06-22 14:24:21.571958448 +0530
@@ -22,6 +22,12 @@
#include <linux/errno.h>
#endif
+#include <linux/mtd/blktrans.h>
+#ifdef TXFLASH
+#include <linux/genhd.h>
+#include <linux/blkdev.h>
+#endif
+
/*
* Maintain information about the progress of the recovery job, so that
* the different passes can carry information between them.
@@ -226,7 +232,7 @@
journal_superblock_t * sb;
struct recovery_info info;
+#ifndef TXFLASH
memset(&info, 0, sizeof(info));
sb = journal->j_superblock;
@@ -265,6 +271,9 @@
err = err2;
return err;
+#else
+ return journal->j_dev->bd_disk->fops->ioctl(journal->j_dev,0777,RECOVER,0);
+#endif
}
/**
diff -ur ./revoke.c /home/srimugunthan/niraj/linux_kernel/linux-2.6.38.6/fs/jbd/revoke.c
--- ./revoke.c 2011-05-10 03:46:23.000000000 +0530
+++ /home/srimugunthan/niraj/linux_kernel/linux-2.6.38.6/fs/jbd/revoke.c 2011-06-22 17:43:20.229114134 +0530
@@ -89,6 +89,7 @@
#include <linux/bio.h>
#endif
#include <linux/log2.h>
+#include <linux/mtd/blktrans.h>
static struct kmem_cache *revoke_record_cache;
static struct kmem_cache *revoke_table_cache;
@@ -119,7 +120,11 @@
#ifdef __KERNEL__
static void write_one_revoke_record(journal_t *, transaction_t *,
struct journal_head **, int *,
- struct jbd_revoke_record_s *, int);
+ struct jbd_revoke_record_s *, int
+ ,int*
+ );
static void flush_descriptor(journal_t *, struct journal_head *, int, int);
#endif
@@ -508,11 +513,12 @@
struct jbd_revoke_table_s *revoke;
struct list_head *hash_list;
int i, offset, count;
+ int meta_cnt;
descriptor = NULL;
offset = 0;
count = 0;
+ meta_cnt=0;
/* select revoke table for committing transaction */
revoke = journal->j_revoke == journal->j_revoke_table[0] ?
journal->j_revoke_table[1] : journal->j_revoke_table[0];
@@ -525,14 +531,25 @@
hash_list->next;
write_one_revoke_record(journal, transaction,
&descriptor, &offset,
- record, write_op);
+ record, write_op
+ ,&meta_cnt
+ );
count++;
list_del(&record->hash);
kmem_cache_free(revoke_record_cache, record);
}
}
if (descriptor)
+ {
+ meta_cnt++;
+ jbd_debug(1, "my_descriptor record count %d\n", meta_cnt);
flush_descriptor(journal, descriptor, offset, write_op);
+ }
jbd_debug(1, "Wrote %d revoke records\n", count);
}
@@ -546,7 +563,11 @@
struct journal_head **descriptorp,
int *offsetp,
struct jbd_revoke_record_s *record,
- int write_op)
+ int write_op
+ ,int *meta_cnt
+ )
{
struct journal_head *descriptor;
int offset;
@@ -565,6 +586,9 @@
/* Make sure we have a descriptor with space left for the record */
if (descriptor) {
if (offset == journal->j_blocksize) {
+ (*meta_cnt)++;
flush_descriptor(journal, descriptor, offset, write_op);
descriptor = NULL;
}
diff -ur ./transaction.c /home/srimugunthan/niraj/linux_kernel/linux-2.6.38.6/fs/jbd/transaction.c
--- ./transaction.c 2011-05-10 03:46:23.000000000 +0530
+++ /home/srimugunthan/niraj/linux_kernel/linux-2.6.38.6/fs/jbd/transaction.c 2011-06-22 14:24:21.501958448 +0530
@@ -26,6 +26,7 @@
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/hrtimer.h>
+#include <linux/mtd/blktrans.h>
static void __journal_temp_unlink_buffer(struct journal_head *jh);
