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Diffstat (limited to 'fs/jbd/transaction.c')
-rw-r--r--fs/jbd/transaction.c76
1 files changed, 44 insertions, 32 deletions
diff --git a/fs/jbd/transaction.c b/fs/jbd/transaction.c
index 7c86b37ebbb..1695ba8334a 100644
--- a/fs/jbd/transaction.c
+++ b/fs/jbd/transaction.c
@@ -26,7 +26,6 @@
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/hrtimer.h>
-#include <linux/backing-dev.h>
static void __journal_temp_unlink_buffer(struct journal_head *jh);
@@ -100,10 +99,11 @@ static int start_this_handle(journal_t *journal, handle_t *handle)
alloc_transaction:
if (!journal->j_running_transaction) {
- new_transaction = kzalloc(sizeof(*new_transaction), GFP_NOFS);
+ new_transaction = kzalloc(sizeof(*new_transaction),
+ GFP_NOFS|__GFP_NOFAIL);
if (!new_transaction) {
- congestion_wait(BLK_RW_ASYNC, HZ/50);
- goto alloc_transaction;
+ ret = -ENOMEM;
+ goto out;
}
}
@@ -245,7 +245,6 @@ static handle_t *new_handle(int nblocks)
handle_t *handle = jbd_alloc_handle(GFP_NOFS);
if (!handle)
return NULL;
- memset(handle, 0, sizeof(*handle));
handle->h_buffer_credits = nblocks;
handle->h_ref = 1;
@@ -426,17 +425,34 @@ int journal_restart(handle_t *handle, int nblocks)
* void journal_lock_updates () - establish a transaction barrier.
* @journal: Journal to establish a barrier on.
*
- * This locks out any further updates from being started, and blocks
- * until all existing updates have completed, returning only once the
- * journal is in a quiescent state with no updates running.
+ * This locks out any further updates from being started, and blocks until all
+ * existing updates have completed, returning only once the journal is in a
+ * quiescent state with no updates running.
*
- * The journal lock should not be held on entry.
+ * We do not use simple mutex for synchronization as there are syscalls which
+ * want to return with filesystem locked and that trips up lockdep. Also
+ * hibernate needs to lock filesystem but locked mutex then blocks hibernation.
+ * Since locking filesystem is rare operation, we use simple counter and
+ * waitqueue for locking.
*/
void journal_lock_updates(journal_t *journal)
{
DEFINE_WAIT(wait);
+wait:
+ /* Wait for previous locked operation to finish */
+ wait_event(journal->j_wait_transaction_locked,
+ journal->j_barrier_count == 0);
+
spin_lock(&journal->j_state_lock);
+ /*
+ * Check reliably under the lock whether we are the ones winning the race
+ * and locking the journal
+ */
+ if (journal->j_barrier_count > 0) {
+ spin_unlock(&journal->j_state_lock);
+ goto wait;
+ }
++journal->j_barrier_count;
/* Wait until there are no running updates */
@@ -460,14 +476,6 @@ void journal_lock_updates(journal_t *journal)
spin_lock(&journal->j_state_lock);
}
spin_unlock(&journal->j_state_lock);
-
- /*
- * We have now established a barrier against other normal updates, but
- * we also need to barrier against other journal_lock_updates() calls
- * to make sure that we serialise special journal-locked operations
- * too.
- */
- mutex_lock(&journal->j_barrier);
}
/**
@@ -475,14 +483,11 @@ void journal_lock_updates(journal_t *journal)
* @journal: Journal to release the barrier on.
*
* Release a transaction barrier obtained with journal_lock_updates().
- *
- * Should be called without the journal lock held.
*/
void journal_unlock_updates (journal_t *journal)
{
J_ASSERT(journal->j_barrier_count != 0);
- mutex_unlock(&journal->j_barrier);
spin_lock(&journal->j_state_lock);
--journal->j_barrier_count;
spin_unlock(&journal->j_state_lock);
@@ -670,7 +675,7 @@ repeat:
jbd_alloc(jh2bh(jh)->b_size,
GFP_NOFS);
if (!frozen_buffer) {
- printk(KERN_EMERG
+ printk(KERN_ERR
"%s: OOM for frozen_buffer\n",
__func__);
JBUFFER_TRACE(jh, "oom!");
@@ -712,9 +717,9 @@ done:
"Possible IO failure.\n");
page = jh2bh(jh)->b_page;
offset = offset_in_page(jh2bh(jh)->b_data);
- source = kmap_atomic(page, KM_USER0);
+ source = kmap_atomic(page);
memcpy(jh->b_frozen_data, source+offset, jh2bh(jh)->b_size);
- kunmap_atomic(source, KM_USER0);
+ kunmap_atomic(source);
}
jbd_unlock_bh_state(bh);
@@ -893,7 +898,7 @@ repeat:
if (!jh->b_committed_data) {
committed_data = jbd_alloc(jh2bh(jh)->b_size, GFP_NOFS);
if (!committed_data) {
- printk(KERN_EMERG "%s: No memory for committed data\n",
+ printk(KERN_ERR "%s: No memory for committed data\n",
__func__);
err = -ENOMEM;
goto out;
@@ -1253,7 +1258,7 @@ int journal_forget (handle_t *handle, struct buffer_head *bh)
goto not_jbd;
}
- /* keep track of wether or not this transaction modified us */
+ /* keep track of whether or not this transaction modified us */
was_modified = jh->b_modified;
/*
@@ -1427,8 +1432,6 @@ int journal_stop(handle_t *handle)
}
}
- if (handle->h_sync)
- transaction->t_synchronous_commit = 1;
current->journal_info = NULL;
spin_lock(&journal->j_state_lock);
spin_lock(&transaction->t_handle_lock);
@@ -2016,16 +2019,20 @@ zap_buffer_unlocked:
* void journal_invalidatepage() - invalidate a journal page
* @journal: journal to use for flush
* @page: page to flush
- * @offset: length of page to invalidate.
+ * @offset: offset of the range to invalidate
+ * @length: length of the range to invalidate
*
- * Reap page buffers containing data after offset in page.
+ * Reap page buffers containing data in specified range in page.
*/
void journal_invalidatepage(journal_t *journal,
struct page *page,
- unsigned long offset)
+ unsigned int offset,
+ unsigned int length)
{
struct buffer_head *head, *bh, *next;
+ unsigned int stop = offset + length;
unsigned int curr_off = 0;
+ int partial_page = (offset || length < PAGE_CACHE_SIZE);
int may_free = 1;
if (!PageLocked(page))
@@ -2033,6 +2040,8 @@ void journal_invalidatepage(journal_t *journal,
if (!page_has_buffers(page))
return;
+ BUG_ON(stop > PAGE_CACHE_SIZE || stop < length);
+
/* We will potentially be playing with lists other than just the
* data lists (especially for journaled data mode), so be
* cautious in our locking. */
@@ -2042,11 +2051,14 @@ void journal_invalidatepage(journal_t *journal,
unsigned int next_off = curr_off + bh->b_size;
next = bh->b_this_page;
+ if (next_off > stop)
+ return;
+
if (offset <= curr_off) {
/* This block is wholly outside the truncation point */
lock_buffer(bh);
may_free &= journal_unmap_buffer(journal, bh,
- offset > 0);
+ partial_page);
unlock_buffer(bh);
}
curr_off = next_off;
@@ -2054,7 +2066,7 @@ void journal_invalidatepage(journal_t *journal,
} while (bh != head);
- if (!offset) {
+ if (!partial_page) {
if (may_free && try_to_free_buffers(page))
J_ASSERT(!page_has_buffers(page));
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-14 09:03:15 +0000