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ext4: Handle nested ext4_journal_start/stop calls without a journal

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This patch fixes a problem with handling nested calls to
ext4_journal_start/ext4_journal_stop, when there is no journal present.

Signed-off-by: Curt Wohlgemuth <curtw@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Curt Wohlgemuth
2009-09-29 11:01:03 -04:00
committed by Theodore Ts'o
parent f3dc272fd5
commit d3d1faf6a7
3 changed files with 38 additions and 13 deletions
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6
fs/ext4/ext4_jbd2.h
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@@ -161,11 +161,13 @@ int __ext4_handle_dirty_metadata(const char *where, handle_t *handle,
handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks);
int __ext4_journal_stop(const char *where, handle_t *handle);
#define EXT4_NOJOURNAL_HANDLE ((handle_t *) 0x1)
#define EXT4_NOJOURNAL_MAX_REF_COUNT ((unsigned long) 4096)
/* Note: Do not use this for NULL handles. This is only to determine if
* a properly allocated handle is using a journal or not. */
static inline int ext4_handle_valid(handle_t *handle)
{
if (handle == EXT4_NOJOURNAL_HANDLE)
if ((unsigned long)handle < EXT4_NOJOURNAL_MAX_REF_COUNT)
return 0;
return 1;
}