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-rw-r--r--fs/reiserfs/journal.c42
1 files changed, 32 insertions, 10 deletions
diff --git a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
index ca8d9e86571f..6c1d0c35f9e9 100644
--- a/fs/reiserfs/journal.c
+++ b/fs/reiserfs/journal.c
@@ -615,6 +615,31 @@ static int journal_list_still_alive(struct super_block *s,
return 0;
}
+/*
+ * If page->mapping was null, we failed to truncate this page for
+ * some reason. Most likely because it was truncated after being
+ * logged via data=journal.
+ *
+ * This does a check to see if the buffer belongs to one of these
+ * lost pages before doing the final put_bh. If page->mapping was
+ * null, it tries to free buffers on the page, which should make the
+ * final page_cache_release drop the page from the lru.
+ */
+static void release_buffer_page(struct buffer_head *bh)
+{
+ struct page *page = bh->b_page;
+ if (!page->mapping && !TestSetPageLocked(page)) {
+ page_cache_get(page);
+ put_bh(bh);
+ if (!page->mapping)
+ try_to_free_buffers(page);
+ unlock_page(page);
+ page_cache_release(page);
+ } else {
+ put_bh(bh);
+ }
+}
+
static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
{
char b[BDEVNAME_SIZE];
@@ -628,8 +653,9 @@ static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
set_buffer_uptodate(bh);
else
clear_buffer_uptodate(bh);
+
unlock_buffer(bh);
- put_bh(bh);
+ release_buffer_page(bh);
}
static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
@@ -1547,9 +1573,10 @@ static int flush_journal_list(struct super_block *s,
BUG_ON(!test_clear_buffer_journal_dirty
(cn->bh));
- /* undo the inc from journal_mark_dirty */
+ /* drop one ref for us */
put_bh(cn->bh);
- brelse(cn->bh);
+ /* drop one ref for journal_mark_dirty */
+ release_buffer_page(cn->bh);
}
cn = cn->next;
}
@@ -3709,13 +3736,8 @@ int journal_mark_freed(struct reiserfs_transaction_handle *th,
}
}
- if (bh) {
- put_bh(bh); /* get_hash grabs the buffer */
- if (atomic_read(&(bh->b_count)) < 0) {
- reiserfs_warning(p_s_sb,
- "journal-2165: bh->b_count < 0");
- }
- }
+ if (bh)
+ release_buffer_page(bh); /* get_hash grabs the buffer */
return 0;
}

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