transaction_t * get_transaction (journal_t * journal)
{
transaction_t * transaction;
J_ASSERT (journal->j_locked);
transaction = kmalloc (sizeof (transaction_t), GFP_KERNEL);
if (!transaction)
return NULL;
memset (transaction, 0, sizeof (transaction_t));
transaction->t_journal = journal;
transaction->t_state = T_RUNNING;
transaction->t_tid = journal->j_transaction_sequence++;
transaction->t_expires = jiffies + journal->j_commit_interval;
/* Set up the commit timer for the new transaction. */
J_ASSERT (!journal->j_commit_timer_active);
journal->j_commit_timer_active = 1;
journal->j_commit_timer->expires = transaction->t_expires;
add_timer(journal->j_commit_timer);
J_ASSERT (journal->j_running_transaction == NULL);
journal->j_running_transaction = transaction;
return transaction;
}
int jbd2__journal_restart(handle_t *handle, int nblocks, gfp_t gfp_mask)
{
transaction_t *transaction = handle->h_transaction;
journal_t *journal = transaction->t_journal;
tid_t tid;
int need_to_start, ret;
if (is_handle_aborted(handle))
return 0;
J_ASSERT(atomic_read(&transaction->t_updates) > 0);
J_ASSERT(journal_current_handle() == handle);
read_lock(&journal->j_state_lock);
spin_lock(&transaction->t_handle_lock);
atomic_sub(handle->h_buffer_credits,
&transaction->t_outstanding_credits);
if (atomic_dec_and_test(&transaction->t_updates))
wake_up(&journal->j_wait_updates);
spin_unlock(&transaction->t_handle_lock);
jbd_debug(2, "restarting handle %p\n", handle);
tid = transaction->t_tid;
need_to_start = !tid_geq(journal->j_commit_request, tid);
read_unlock(&journal->j_state_lock);
if (need_to_start)
jbd2_log_start_commit(journal, tid);
lock_map_release(&handle->h_lockdep_map);
handle->h_buffer_credits = nblocks;
ret = start_this_handle(journal, handle, gfp_mask);
return ret;
}
void journal_refile_buffer(struct buffer_head *bh)
{
#ifdef __SMP__
J_ASSERT (current->lock_depth >= 0);
#endif
journal_unfile_buffer(bh);
/* If the buffer is now unused, just drop it. If it has been
modified by a later transaction, add it to the new
transaction's metadata list. */
bh->b_transaction = bh->b_next_transaction;
bh->b_next_transaction = NULL;
if (bh->b_transaction != NULL) {
int tstate;
journal_file_buffer(bh, bh->b_transaction, BJ_Metadata);
tstate = bh->b_transaction->t_state;
J_ASSERT(tstate == T_RUNNING);
}
/* If necessary, remove it from the global journaled
buffer list and replace it back on the main dirty
buffer list. */
refile_buffer(bh);
}
/* Initialise the revoke table for a given journal to a given size. */
int jbd2_journal_init_revoke(journal_t *journal, int hash_size)
{
J_ASSERT(journal->j_revoke_table[0] == NULL);
J_ASSERT(is_power_of_2(hash_size));
journal->j_revoke_table[0] = jbd2_journal_init_revoke_table(hash_size);
if (!journal->j_revoke_table[0])
goto fail0;
journal->j_revoke_table[1] = jbd2_journal_init_revoke_table(hash_size);
if (!journal->j_revoke_table[1])
goto fail1;
journal->j_revoke = journal->j_revoke_table[1];
spin_lock_init(&journal->j_revoke_lock);
return 0;
fail1:
jbd2_journal_destroy_revoke_table(journal->j_revoke_table[0]);
journal->j_revoke_table[0] = NULL;
fail0:
return -ENOMEM;
}
/**
* journal_t * journal_init_inode () - creates a journal which maps to a inode.
* @inode: An inode to create the journal in
*
* journal_init_inode creates a journal which maps an on-disk inode as
* the journal. The inode must exist already, must support bmap() and
* must have all data blocks preallocated.
*/
journal_t * journal_init_inode (struct inode *inode)
{
struct buffer_head *bh;
journal_t *journal = journal_init_common();
int err;
int n;
unsigned long blocknr;
if (!journal)
return NULL;
journal->j_dev = journal->j_fs_dev = inode->i_sb->s_bdev;
journal->j_inode = inode;
jbd_debug(1,
"journal %p: inode %s/%ld, size %Ld, bits %d, blksize %ld\n",
journal, inode->i_sb->s_id, inode->i_ino,
(s64) inode->i_size,
inode->i_sb->s_blocksize_bits, inode->i_sb->s_blocksize);
journal->j_maxlen = (unsigned int)(inode->i_size >> inode->i_sb->s_blocksize_bits);
journal->j_blocksize = inode->i_sb->s_blocksize;
/* journal descriptor can store up to n blocks -bzzz */
n = journal->j_blocksize / sizeof(journal_block_tag_t);
journal->j_wbufsize = n;
journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL);
if (!journal->j_wbuf) {
printk(KERN_ERR "%s: Cant allocate bhs for commit thread\n",
__FUNCTION__);
J_ASSERT(journal->j_revoke != NULL);
if (journal->j_revoke)
journal_destroy_revoke(journal);
kfree(journal);
return NULL;
}
err = journal_bmap(journal, 0, &blocknr);
/* If that failed, give up */
if (err) {
printk(KERN_ERR "%s: Cannnot locate journal superblock\n",
__FUNCTION__);
J_ASSERT(journal->j_revoke != NULL);
if (journal->j_revoke)
journal_destroy_revoke(journal);
J_ASSERT(journal->j_wbuf != NULL);
kfree(journal->j_wbuf);
kfree(journal);
return NULL;
}
bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize);
J_ASSERT(bh != NULL);
journal->j_sb_buffer = bh;
journal->j_superblock = (journal_superblock_t *)bh->b_data;
return journal;
}
int journal_dirty_data (handle_t *handle, struct buffer_head *bh)
{
journal_t *journal = handle->h_transaction->t_journal;
lock_journal(journal);
mark_buffer_dirty(bh, 0);
/*
* What if the buffer is already part of a running transaction?
*
* There are two cases:
* 1) It is part of the current running transaction. Refile it,
* just in case we have allocated it as metadata, deallocated
* it, then reallocated it as data.
* 2) It is part of the previous, still-committing transaction.
* If all we want to do is to guarantee that the buffer will be
* written to disk before this new transaction commits, then
* being sure that the *previous* transaction has this same
* property is sufficient for us! Just leave it on its old
* transaction.
*
* In case (2), the buffer must not already exist as metadata
* --- that would violate write ordering (a transaction is free
* to write its data at any point, even before the previous
* committing transaction has committed). The caller must
* never, ever allow this to happen: there's nothing we can do
* about it in this layer.
*/
if (bh->b_transaction) {
if (bh->b_transaction != handle->h_transaction) {
J_ASSERT (bh->b_transaction == journal->j_committing_transaction);
/* @@@ IS THIS TRUE ? */
J_ASSERT (bh->b_next_transaction == NULL);
/* Special case --- the buffer might actually
have been allocated and then immediately
deallocated in the previous, committing
transaction, so might still be left on that
transaction's metadata lists. */
if (bh->b_jlist != BJ_Data) {
J_ASSERT (bh->b_jlist != BJ_Shadow);
J_ASSERT (test_and_clear_bit(BH_QuickFree, &bh->b_state));
journal_unfile_buffer(bh);
bh->b_transaction = NULL;
journal_file_buffer(bh, handle->h_transaction, BJ_Data);
refile_buffer(bh);
}
}
} else {
journal_file_buffer(bh, handle->h_transaction, BJ_Data);
refile_buffer(bh);
}
unlock_journal(journal);
return 0;
}
int journal_stop (handle_t *handle)
{
transaction_t *transaction = handle->h_transaction;
journal_t *journal = transaction->t_journal;
int force_sync;
if (!handle)
return 0;
J_ASSERT (transaction->t_updates > 0);
J_ASSERT (current->j_handle == handle);
if (--handle->h_ref > 0)
return 0;
jfs_debug(4, "Handle %p going down\n", handle);
current->j_handle = NULL;
// current->fs_locks--;
transaction->t_outstanding_credits -= handle->h_buffer_credits;
transaction->t_updates--;
if (!transaction->t_updates) {
wake_up(&journal->j_wait_updates);
if (journal->j_barrier_count)
wake_up(&journal->j_wait_transaction_locked);
}
/*
* If the journal is marked SYNC, we need to set another commit
* going! We also want to force a commit if the current
* transaction is occupying too much of the log, or if the
* transaction is too old now.
*/
force_sync = (journal->j_flags & JFS_SYNC) || handle->h_sync;
if (force_sync ||
transaction->t_outstanding_credits > journal->j_max_transaction_buffers ||
time_after_eq(jiffies, transaction->t_expires)) {
tid_t tid = transaction->t_tid;
jfs_debug(2, "transaction too old, requesting commit for handle %p\n", handle);
log_start_commit(journal, transaction);
/*
* Special case: JFS_SYNC synchronous updates require us
* to wait for the commit to complete.
*/
if (force_sync)
log_wait_commit(journal, tid);
}
kfree(handle);
return 0;
}
void __jbd2_journal_drop_transaction(journal_t *journal, transaction_t *transaction)
{
assert_spin_locked(&journal->j_list_lock);
if (transaction->t_cpnext) {
transaction->t_cpnext->t_cpprev = transaction->t_cpprev;
transaction->t_cpprev->t_cpnext = transaction->t_cpnext;
if (journal->j_checkpoint_transactions == transaction)
journal->j_checkpoint_transactions =
transaction->t_cpnext;
if (journal->j_checkpoint_transactions == transaction)
journal->j_checkpoint_transactions = NULL;
}
J_ASSERT(transaction->t_state == T_FINISHED);
J_ASSERT(transaction->t_buffers == NULL);
J_ASSERT(transaction->t_forget == NULL);
J_ASSERT(transaction->t_shadow_list == NULL);
J_ASSERT(transaction->t_checkpoint_list == NULL);
J_ASSERT(transaction->t_checkpoint_io_list == NULL);
J_ASSERT(atomic_read(&transaction->t_updates) == 0);
J_ASSERT(journal->j_committing_transaction != transaction);
J_ASSERT(journal->j_running_transaction != transaction);
trace_jbd2_drop_transaction(journal, transaction);
jbd_debug(1, "Dropping transaction %d, all done\n", transaction->t_tid);
}
void journal_unfile_buffer(struct buffer_head *buf)
{
struct buffer_head **list = 0;
transaction_t * transaction;
transaction = buf->b_transaction;
#ifdef __SMP__
J_ASSERT (current->lock_depth >= 0);
#endif
J_ASSERT (transaction->t_journal->j_locked);
J_ASSERT (buf->b_jlist < BJ_Types);
if (buf->b_jlist != BJ_None)
J_ASSERT (transaction != 0);
switch (buf->b_jlist) {
case BJ_None:
return;
case BJ_Data:
list = &transaction->t_datalist;
break;
case BJ_Metadata:
transaction->t_nr_buffers--;
J_ASSERT(transaction->t_nr_buffers >= 0);
list = &transaction->t_buffers;
break;
case BJ_Forget:
list = &transaction->t_forget;
break;
case BJ_IO:
list = &transaction->t_iobuf_list;
break;
case BJ_Shadow:
list = &transaction->t_shadow_list;
break;
case BJ_LogCtl:
list = &transaction->t_log_list;
break;
case BJ_Reserved:
list = &transaction->t_reserved_list;
break;
}
blist_del_buffer(list, buf);
buf->b_jlist = BJ_None;
if (buffer_jdirty(buf)) {
set_bit(BH_Dirty, &buf->b_state);
clear_bit(BH_JDirty, &buf->b_state);
}
}
int jbd2_cleanup_journal_tail(journal_t *journal)
{
tid_t first_tid;
unsigned long blocknr;
if (is_journal_aborted(journal))
return 1;
if (!jbd2_journal_get_log_tail(journal, &first_tid, &blocknr))
return 1;
J_ASSERT(blocknr != 0);
/*
*/
if (journal->j_flags & JBD2_BARRIER)
blkdev_issue_flush(journal->j_fs_dev, GFP_KERNEL, NULL);
__jbd2_update_log_tail(journal, first_tid, blocknr);
return 0;
}
int ext3_sync_file(struct file * file, struct dentry *dentry, int datasync)
{
struct inode *inode = dentry->d_inode;
int ret;
J_ASSERT(ext3_journal_current_handle() == 0);
/*
* fsync_inode_buffers() just walks i_dirty_buffers and waits
* on them. It's a no-op for full data journalling because
* i_dirty_buffers will be ampty.
* Really, we only need to start I/O on the dirty buffers -
* we'll end up waiting on them in commit.
*/
ret = fsync_inode_buffers(inode);
/* In writeback mode, we need to force out data buffers too. In
* the other modes, ext3_force_commit takes care of forcing out
* just the right data blocks. */
if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
ret |= fsync_inode_data_buffers(inode);
ext3_force_commit(inode->i_sb);
return ret;
}
int jbd2_journal_try_to_free_buffers(journal_t *journal,
struct page *page, gfp_t gfp_mask)
{
struct buffer_head *head;
struct buffer_head *bh;
int ret = 0;
J_ASSERT(PageLocked(page));
head = page_buffers(page);
bh = head;
do {
struct journal_head *jh;
jh = jbd2_journal_grab_journal_head(bh);
if (!jh)
continue;
jbd_lock_bh_state(bh);
__journal_try_to_free_buffer(journal, bh);
jbd2_journal_put_journal_head(jh);
jbd_unlock_bh_state(bh);
if (buffer_jbd(bh))
goto busy;
} while ((bh = bh->b_this_page) != head);
ret = try_to_free_buffers(page);
busy:
return ret;
}
int ext3_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
{
struct inode *inode = file->f_mapping->host;
struct ext3_inode_info *ei = EXT3_I(inode);
journal_t *journal = EXT3_SB(inode->i_sb)->s_journal;
int ret, needs_barrier = 0;
tid_t commit_tid;
trace_ext3_sync_file_enter(file, datasync);
if (inode->i_sb->s_flags & MS_RDONLY)
return 0;
ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
if (ret)
goto out;
J_ASSERT(ext3_journal_current_handle() == NULL);
/*
* data=writeback,ordered:
* The caller's filemap_fdatawrite()/wait will sync the data.
* Metadata is in the journal, we wait for a proper transaction
* to commit here.
*
* data=journal:
* filemap_fdatawrite won't do anything (the buffers are clean).
* ext3_force_commit will write the file data into the journal and
* will wait on that.
* filemap_fdatawait() will encounter a ton of newly-dirtied pages
* (they were dirtied by commit). But that's OK - the blocks are
* safe in-journal, which is all fsync() needs to ensure.
*/
if (ext3_should_journal_data(inode)) {
ret = ext3_force_commit(inode->i_sb);
goto out;
}
if (datasync)
commit_tid = atomic_read(&ei->i_datasync_tid);
else
commit_tid = atomic_read(&ei->i_sync_tid);
if (test_opt(inode->i_sb, BARRIER) &&
!journal_trans_will_send_data_barrier(journal, commit_tid))
needs_barrier = 1;
log_start_commit(journal, commit_tid);
ret = log_wait_commit(journal, commit_tid);
/*
* In case we didn't commit a transaction, we have to flush
* disk caches manually so that data really is on persistent
* storage
*/
if (needs_barrier)
blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
out:
trace_ext3_sync_file_exit(inode, ret);
return ret;
}
static transaction_t *
jbd2_get_transaction(journal_t *journal, transaction_t *transaction)
{
transaction->t_journal = journal;
transaction->t_state = T_RUNNING;
transaction->t_start_time = ktime_get();
transaction->t_tid = journal->j_transaction_sequence++;
transaction->t_expires = jiffies + journal->j_commit_interval;
spin_lock_init(&transaction->t_handle_lock);
atomic_set(&transaction->t_updates, 0);
atomic_set(&transaction->t_outstanding_credits, 0);
atomic_set(&transaction->t_handle_count, 0);
INIT_LIST_HEAD(&transaction->t_inode_list);
INIT_LIST_HEAD(&transaction->t_private_list);
journal->j_commit_timer.expires = round_jiffies_up(transaction->t_expires);
add_timer(&journal->j_commit_timer);
J_ASSERT(journal->j_running_transaction == NULL);
journal->j_running_transaction = transaction;
transaction->t_max_wait = 0;
transaction->t_start = jiffies;
return transaction;
}
int journal_wipe(journal_t *journal, int write)
{
journal_superblock_t *sb;
int err = 0;
J_ASSERT (!(journal->j_flags & JFS_LOADED));
err = load_superblock(journal);
if (err)
return err;
sb = journal->j_superblock;
if (!journal->j_tail)
goto no_recovery;
printk (KERN_WARNING "JBD: %s recovery information on journal\n",
write ? "Clearing" : "Ignoring");
err = journal_skip_recovery(journal);
if (write)
journal_update_superblock(journal, 1);
no_recovery:
return err;
}
int jbd2_cleanup_journal_tail(journal_t *journal)
{
tid_t first_tid;
unsigned long blocknr;
if (is_journal_aborted(journal))
return -EIO;
if (!jbd2_journal_get_log_tail(journal, &first_tid, &blocknr))
return 1;
J_ASSERT(blocknr != 0);
/*
* We need to make sure that any blocks that were recently written out
* --- perhaps by jbd2_log_do_checkpoint() --- are flushed out before
* we drop the transactions from the journal. It's unlikely this will
* be necessary, especially with an appropriately sized journal, but we
* need this to guarantee correctness. Fortunately
* jbd2_cleanup_journal_tail() doesn't get called all that often.
*/
if (journal->j_flags & JBD2_BARRIER)
blkdev_issue_flush(journal->j_fs_dev, GFP_NOFS, NULL);
return __jbd2_update_log_tail(journal, first_tid, blocknr);
}
handle_t *journal_start(journal_t *journal, int nblocks)
{
handle_t *handle = journal_current_handle();
int err;
if (!journal)
return ERR_PTR(-EROFS);
if (handle) {
J_ASSERT(handle->h_transaction->t_journal == journal);
handle->h_ref++;
return handle;
}
handle = new_handle(nblocks);
if (!handle)
return ERR_PTR(-ENOMEM);
current->journal_info = handle;
err = start_this_handle(journal, handle);
if (err < 0) {
jbd_free_handle(handle);
current->journal_info = NULL;
handle = ERR_PTR(err);
goto out;
}
out:
return handle;
}
void jbd2_journal_invalidatepage(journal_t *journal,
struct page *page,
unsigned long offset)
{
struct buffer_head *head, *bh, *next;
unsigned int curr_off = 0;
int may_free = 1;
if (!PageLocked(page))
BUG();
if (!page_has_buffers(page))
return;
head = bh = page_buffers(page);
do {
unsigned int next_off = curr_off + bh->b_size;
next = bh->b_this_page;
if (offset <= curr_off) {
lock_buffer(bh);
may_free &= journal_unmap_buffer(journal, bh);
unlock_buffer(bh);
}
curr_off = next_off;
bh = next;
} while (bh != head);
if (!offset) {
if (may_free && try_to_free_buffers(page))
J_ASSERT(!page_has_buffers(page));
}
}
void hm_async_queue_push_unlocked(JAsyncQueue *queue, void *data)
{
J_ASSERT(queue != NULL && data != NULL);
hm_queue_push_tail(&queue->queue, data);
hm_cond_signal(queue->cond);
}
int journal_get_undo_access (handle_t *handle, struct buffer_head *bh)
{
journal_t *journal = handle->h_transaction->t_journal;
int err;
lock_journal_bh_wait(bh, journal);
/* Do this first --- it can drop the journal lock, so we want to
* make sure that obtaining the committed_data is done
* atomically wrt. completion of any outstanding commits. */
err = do_get_write_access (handle, bh, 1);
if (!bh->b_committed_data) {
/* Copy out the current buffer contents into the
* preserved, committed copy. */
bh->b_committed_data = kmalloc(bh->b_size, GFP_KERNEL);
if (!bh->b_committed_data) {
unlock_journal(journal);
return -ENOMEM;
}
memcpy (bh->b_committed_data, bh->b_data, bh->b_size);
}
unlock_journal(journal);
if (!err)
J_ASSERT(bh->b_committed_data);
return err;
}
JAsyncQueue *hm_async_queue_ref(JAsyncQueue *queue)
{
J_ASSERT(queue != NULL);
atomic_inc(&queue->ref_count);
return queue;
}
int cleanup_journal_tail(journal_t *journal)
{
transaction_t * transaction;
tid_t first_tid;
unsigned long blocknr, freed;
/* OK, work out the oldest transaction remaining in the log, and
* the log block it starts at.
*
* If the log is now empty, we need to work out which is the
* next transaction ID we will write, and where it will
* start. */
spin_lock(&journal->j_state_lock);
spin_lock(&journal->j_list_lock);
transaction = journal->j_checkpoint_transactions;
if (transaction) {
first_tid = transaction->t_tid;
blocknr = transaction->t_log_start;
} else if ((transaction = journal->j_committing_transaction) != NULL) {
first_tid = transaction->t_tid;
blocknr = transaction->t_log_start;
} else if ((transaction = journal->j_running_transaction) != NULL) {
first_tid = transaction->t_tid;
blocknr = journal->j_head;
} else {
first_tid = journal->j_transaction_sequence;
blocknr = journal->j_head;
}
spin_unlock(&journal->j_list_lock);
J_ASSERT(blocknr != 0);
/* If the oldest pinned transaction is at the tail of the log
already then there's not much we can do right now. */
if (journal->j_tail_sequence == first_tid) {
spin_unlock(&journal->j_state_lock);
return 1;
}
/* OK, update the superblock to recover the freed space.
* Physical blocks come first: have we wrapped beyond the end of
* the log? */
freed = blocknr - journal->j_tail;
if (blocknr < journal->j_tail)
freed = freed + journal->j_last - journal->j_first;
jbd_debug(1,
"Cleaning journal tail from %d to %d (offset %lu), "
"freeing %lu\n",
journal->j_tail_sequence, first_tid, blocknr, freed);
journal->j_free += freed;
journal->j_tail_sequence = first_tid;
journal->j_tail = blocknr;
spin_unlock(&journal->j_state_lock);
if (!(journal->j_flags & JFS_ABORT))
journal_update_superblock(journal, 1);
return 0;
}
void hm_thread_pool_push(JThreadPool *tp, void *data)
{
JRealThreadPool *_tp;
J_ASSERT(tp != NULL && data != NULL);
_tp = (JRealThreadPool*)tp;
hm_async_queue_push(_tp->queue, data);
}
void hm_async_queue_push(JAsyncQueue *queue, void *data)
{
J_ASSERT(queue != NULL);
hm_mutex_lock(queue->mutex);
hm_async_queue_push_unlocked(queue, data);
hm_mutex_unlock(queue->mutex);
}
/*
* Release a JNetRealBuf object.
*/
__export void
hm_net_buf_free(JNetBuf *buf)
{
J_ASSERT(buf != NULL);
hm_mutex_free(buf->buf_lock);
hm_dealloc(buf, buf->object_size);
}
int ext4_sync_file(struct file *file, struct dentry *dentry, int datasync)
{
struct inode *inode = dentry->d_inode;
struct ext4_inode_info *ei = EXT4_I(inode);
journal_t *journal = EXT4_SB(inode->i_sb)->s_journal;
int ret;
tid_t commit_tid;
J_ASSERT(ext4_journal_current_handle() == NULL);
trace_ext4_sync_file(file, dentry, datasync);
if (inode->i_sb->s_flags & MS_RDONLY)
return 0;
ret = flush_aio_dio_completed_IO(inode);
if (ret < 0)
return ret;
if (!journal)
return simple_fsync(file, dentry, datasync);
/*
* data=writeback,ordered:
* The caller's filemap_fdatawrite()/wait will sync the data.
* Metadata is in the journal, we wait for proper transaction to
* commit here.
*
* data=journal:
* filemap_fdatawrite won't do anything (the buffers are clean).
* ext4_force_commit will write the file data into the journal and
* will wait on that.
* filemap_fdatawait() will encounter a ton of newly-dirtied pages
* (they were dirtied by commit). But that's OK - the blocks are
* safe in-journal, which is all fsync() needs to ensure.
*/
if (ext4_should_journal_data(inode))
return ext4_force_commit(inode->i_sb);
commit_tid = datasync ? ei->i_datasync_tid : ei->i_sync_tid;
if (jbd2_log_start_commit(journal, commit_tid)) {
/*
* When the journal is on a different device than the
* fs data disk, we need to issue the barrier in
* writeback mode. (In ordered mode, the jbd2 layer
* will take care of issuing the barrier. In
* data=journal, all of the data blocks are written to
* the journal device.)
*/
if (ext4_should_writeback_data(inode) &&
(journal->j_fs_dev != journal->j_dev) &&
(journal->j_flags & JBD2_BARRIER))
blkdev_issue_flush(inode->i_sb->s_bdev, NULL);
ret = jbd2_log_wait_commit(journal, commit_tid);
} else if (journal->j_flags & JBD2_BARRIER)
blkdev_issue_flush(inode->i_sb->s_bdev, NULL);
return ret;
}
/**
* pause the play, return true if current are playing
* */
bool OpenSLIn::pause(){
J_ASSERT(mState == SLIN_PAUSE || mState == SLIN_RECORD);
tryCallBack(WHEN_PAUSE, &mState);
if(mState == SLIN_PAUSE){
// goto record
mState = SLIN_RECORD;
}else if(mState == SLIN_RECORD){
// goto pause
mState = SLIN_PAUSE;
return true;
}else {
J_ASSERT(false);
}
return false;
}
/**
* stop the play
* */
void OpenSLIn::stop(){
J_ASSERT(mState != SLIN_STOP);
tryCallBack(WHEN_STOP, 0);
mState = SLIN_STOP;
stopInternal();
return;
}
/**
* void journal_destroy() - Release a journal_t structure.
* @journal: Journal to act on.
*
* Release a journal_t structure once it is no longer in use by the
* journaled object.
*/
void journal_destroy(journal_t *journal)
{
#if 0
/* Wait for the commit thread to wake up and die. */
journal_kill_thread(journal);
/* Force a final log commit */
if (journal->j_running_transaction)
journal_commit_transaction(journal);
/* Force any old transactions to disk */
/* Totally anal locking here... */
jbd_lock(&journal->j_list_lock);
while (journal->j_checkpoint_transactions != NULL) {
jbd_unlock(&journal->j_list_lock);
log_do_checkpoint(journal);
jbd_lock(&journal->j_list_lock);
}
J_ASSERT(journal->j_running_transaction == NULL);
J_ASSERT(journal->j_committing_transaction == NULL);
J_ASSERT(journal->j_checkpoint_transactions == NULL);
jbd_unlock(&journal->j_list_lock);
/* We can now mark the journal as empty. */
journal->j_tail = 0;
journal->j_tail_sequence = ++journal->j_transaction_sequence;
if (journal->j_sb_buffer) {
journal_update_superblock(journal, 1);
brelse(journal->j_sb_buffer);
}
#endif
if (journal->j_sb_buffer) {
brelse(journal->j_sb_buffer);
}
if (journal->j_inode)
iput(journal->j_inode);
if (journal->j_revoke)
journal_destroy_revoke(journal);
kfree(journal->j_wbuf);
kfree(journal);
}
int ext3_sync_file(struct file * file, struct dentry *dentry, int datasync)
{
struct inode *inode = dentry->d_inode;
int ret = 0;
J_ASSERT(ext3_journal_current_handle() == 0);
/*
* data=writeback:
* The caller's filemap_fdatawrite()/wait will sync the data.
* sync_inode() will sync the metadata
*
* data=ordered:
* The caller's filemap_fdatawrite() will write the data and
* sync_inode() will write the inode if it is dirty. Then the caller's
* filemap_fdatawait() will wait on the pages.
*
* data=journal:
* filemap_fdatawrite won't do anything (the buffers are clean).
* ext3_force_commit will write the file data into the journal and
* will wait on that.
* filemap_fdatawait() will encounter a ton of newly-dirtied pages
* (they were dirtied by commit). But that's OK - the blocks are
* safe in-journal, which is all fsync() needs to ensure.
*/
if (ext3_should_journal_data(inode)) {
ret = ext3_force_commit(inode->i_sb);
goto out;
}
if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
goto flush;
/*
* The VFS has written the file data. If the inode is unaltered
* then we need not start a commit.
*/
if (inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC)) {
struct writeback_control wbc = {
.sync_mode = WB_SYNC_ALL,
.nr_to_write = 0, /* sys_fsync did this */
};
ret = sync_inode(inode, &wbc);
goto out;
}
flush:
/*
* In case we didn't commit a transaction, we have to flush
* disk caches manually so that data really is on persistent
* storage
*/
if (test_opt(inode->i_sb, BARRIER))
blkdev_issue_flush(inode->i_sb->s_bdev, NULL);
out:
return ret;
}