[Ocfs2-devel] [PATCH 06/18] ocfs2: Add journal_access functions with jbd2 triggers.
Joel Becker
joel.becker at oracle.com
Tue Dec 9 17:09:43 PST 2008
We create wrappers for ocfs2_journal_access() that are specific to the
type of metadata block. This allows us to associate jbd2 commit
triggers with the block. The triggers will compute metadata ecc in a
future commit.
Signed-off-by: Joel Becker <joel.becker at oracle.com>
---
fs/ocfs2/journal.c | 159 ++++++++++++++++++++++++++++++++++++++++++++++++++-
fs/ocfs2/journal.h | 31 +++++++++--
2 files changed, 181 insertions(+), 9 deletions(-)
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index 302f114..2daa584 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -35,6 +35,7 @@
#include "ocfs2.h"
#include "alloc.h"
+#include "blockcheck.h"
#include "dir.h"
#include "dlmglue.h"
#include "extent_map.h"
@@ -369,10 +370,110 @@ bail:
return status;
}
-int ocfs2_journal_access(handle_t *handle,
- struct inode *inode,
- struct buffer_head *bh,
- int type)
+struct ocfs2_triggers {
+ struct jbd2_buffer_trigger_type ot_triggers;
+ int ot_offset;
+};
+
+static inline struct ocfs2_triggers *to_ocfs2_trigger(struct jbd2_buffer_trigger_type *triggers)
+{
+ return container_of(triggers, struct ocfs2_triggers, ot_triggers);
+}
+
+static void ocfs2_commit_trigger(struct jbd2_buffer_trigger_type *triggers,
+ struct buffer_head *bh,
+ void *data, size_t size)
+{
+ struct ocfs2_triggers *ot = to_ocfs2_trigger(triggers);
+
+ /*
+ * We aren't guaranteed to have the superblock here, so we
+ * must unconditionally compute the ecc data.
+ * __ocfs2_journal_access() will only set the triggers if
+ * metaecc is enabled.
+ */
+ ocfs2_block_check_compute(data, size, data + ot->ot_offset);
+}
+
+/*
+ * Quota blocks have their own trigger because the struct ocfs2_block_check
+ * offset depends on the blocksize.
+ */
+static void ocfs2_dq_commit_trigger(struct jbd2_buffer_trigger_type *triggers,
+ struct buffer_head *bh,
+ void *data, size_t size)
+{
+ struct ocfs2_disk_dqtrailer *dqt =
+ ocfs2_block_dqtrailer(size, data);
+
+ /*
+ * We aren't guaranteed to have the superblock here, so we
+ * must unconditionally compute the ecc data.
+ * __ocfs2_journal_access() will only set the triggers if
+ * metaecc is enabled.
+ */
+ ocfs2_block_check_compute(data, size, &dqt->dq_check);
+}
+
+static void ocfs2_abort_trigger(struct jbd2_buffer_trigger_type *triggers,
+ struct buffer_head *bh)
+{
+ mlog(ML_ERROR,
+ "ocfs2_abort_trigger called by JBD2. bh = 0x%lx, "
+ "bh->b_blocknr = %llu\n",
+ (unsigned long)bh,
+ (unsigned long long)bh->b_blocknr);
+
+ /* We aren't guaranteed to have the superblock here - but if we
+ * don't, it'll just crash. */
+ ocfs2_error(bh->b_assoc_map->host->i_sb,
+ "JBD2 has aborted our journal, ocfs2 cannot continue\n");
+}
+
+static struct ocfs2_triggers di_triggers = {
+ .ot_triggers = {
+ .t_commit = ocfs2_commit_trigger,
+ .t_abort = ocfs2_abort_trigger,
+ },
+ .ot_offset = offsetof(struct ocfs2_dinode, i_check),
+};
+
+static struct ocfs2_triggers eb_triggers = {
+ .ot_triggers = {
+ .t_commit = ocfs2_commit_trigger,
+ .t_abort = ocfs2_abort_trigger,
+ },
+ .ot_offset = offsetof(struct ocfs2_extent_block, h_check),
+};
+
+static struct ocfs2_triggers gd_triggers = {
+ .ot_triggers = {
+ .t_commit = ocfs2_commit_trigger,
+ .t_abort = ocfs2_abort_trigger,
+ },
+ .ot_offset = offsetof(struct ocfs2_group_desc, bg_check),
+};
+
+static struct ocfs2_triggers xb_triggers = {
+ .ot_triggers = {
+ .t_commit = ocfs2_commit_trigger,
+ .t_abort = ocfs2_abort_trigger,
+ },
+ .ot_offset = offsetof(struct ocfs2_xattr_block, xb_check),
+};
+
+static struct ocfs2_triggers dq_triggers = {
+ .ot_triggers = {
+ .t_commit = ocfs2_dq_commit_trigger,
+ .t_abort = ocfs2_abort_trigger,
+ },
+};
+
+static int __ocfs2_journal_access(handle_t *handle,
+ struct inode *inode,
+ struct buffer_head *bh,
+ struct ocfs2_triggers *triggers,
+ int type)
{
int status;
@@ -418,6 +519,8 @@ int ocfs2_journal_access(handle_t *handle,
status = -EINVAL;
mlog(ML_ERROR, "Uknown access type!\n");
}
+ if (!status && ocfs2_meta_ecc(OCFS2_SB(inode->i_sb)) && triggers)
+ jbd2_journal_set_triggers(bh, &triggers->ot_triggers);
mutex_unlock(&OCFS2_I(inode)->ip_io_mutex);
if (status < 0)
@@ -428,6 +531,54 @@ int ocfs2_journal_access(handle_t *handle,
return status;
}
+int ocfs2_journal_access_di(handle_t *handle, struct inode *inode,
+ struct buffer_head *bh, int type)
+{
+ return __ocfs2_journal_access(handle, inode, bh, &di_triggers,
+ type);
+}
+
+int ocfs2_journal_access_eb(handle_t *handle, struct inode *inode,
+ struct buffer_head *bh, int type)
+{
+ return __ocfs2_journal_access(handle, inode, bh, &eb_triggers,
+ type);
+}
+
+int ocfs2_journal_access_gd(handle_t *handle, struct inode *inode,
+ struct buffer_head *bh, int type)
+{
+ return __ocfs2_journal_access(handle, inode, bh, &gd_triggers,
+ type);
+}
+
+int ocfs2_journal_access_db(handle_t *handle, struct inode *inode,
+ struct buffer_head *bh, int type)
+{
+ /* Right now, nothing for dirblocks */
+ return __ocfs2_journal_access(handle, inode, bh, NULL, type);
+}
+
+int ocfs2_journal_access_xb(handle_t *handle, struct inode *inode,
+ struct buffer_head *bh, int type)
+{
+ return __ocfs2_journal_access(handle, inode, bh, &xb_triggers,
+ type);
+}
+
+int ocfs2_journal_access_dq(handle_t *handle, struct inode *inode,
+ struct buffer_head *bh, int type)
+{
+ return __ocfs2_journal_access(handle, inode, bh, &dq_triggers,
+ type);
+}
+
+int ocfs2_journal_access(handle_t *handle, struct inode *inode,
+ struct buffer_head *bh, int type)
+{
+ return __ocfs2_journal_access(handle, inode, bh, NULL, type);
+}
+
int ocfs2_journal_dirty(handle_t *handle,
struct buffer_head *bh)
{
diff --git a/fs/ocfs2/journal.h b/fs/ocfs2/journal.h
index 37013bf..bca370d 100644
--- a/fs/ocfs2/journal.h
+++ b/fs/ocfs2/journal.h
@@ -212,9 +212,12 @@ static inline void ocfs2_checkpoint_inode(struct inode *inode)
* ocfs2_extend_trans - Extend a handle by nblocks credits. This may
* commit the handle to disk in the process, but will
* not release any locks taken during the transaction.
- * ocfs2_journal_access - Notify the handle that we want to journal this
+ * ocfs2_journal_access* - Notify the handle that we want to journal this
* buffer. Will have to call ocfs2_journal_dirty once
* we've actually dirtied it. Type is one of . or .
+ * Always call the specific flavor of
+ * ocfs2_journal_access_*() unless you intend to
+ * manage the checksum by hand.
* ocfs2_journal_dirty - Mark a journalled buffer as having dirty data.
* ocfs2_jbd2_file_inode - Mark an inode so that its data goes out before
* the current handle commits.
@@ -244,10 +247,28 @@ int ocfs2_extend_trans(handle_t *handle, int nblocks);
#define OCFS2_JOURNAL_ACCESS_WRITE 1
#define OCFS2_JOURNAL_ACCESS_UNDO 2
-int ocfs2_journal_access(handle_t *handle,
- struct inode *inode,
- struct buffer_head *bh,
- int type);
+/* ocfs2_inode */
+int ocfs2_journal_access_di(handle_t *handle, struct inode *inode,
+ struct buffer_head *bh, int type);
+/* ocfs2_extent_block */
+int ocfs2_journal_access_eb(handle_t *handle, struct inode *inode,
+ struct buffer_head *bh, int type);
+/* ocfs2_group_desc */
+int ocfs2_journal_access_gd(handle_t *handle, struct inode *inode,
+ struct buffer_head *bh, int type);
+/* ocfs2_xattr_block */
+int ocfs2_journal_access_xb(handle_t *handle, struct inode *inode,
+ struct buffer_head *bh, int type);
+/* quota blocks */
+int ocfs2_journal_access_dq(handle_t *handle, struct inode *inode,
+ struct buffer_head *bh, int type);
+/* dirblock */
+int ocfs2_journal_access_db(handle_t *handle, struct inode *inode,
+ struct buffer_head *bh, int type);
+/* Anything that has no ecc */
+int ocfs2_journal_access(handle_t *handle, struct inode *inode,
+ struct buffer_head *bh, int type);
+
/*
* A word about the journal_access/journal_dirty "dance". It is
* entirely legal to journal_access a buffer more than once (as long
--
1.5.6.5
More information about the Ocfs2-devel
mailing list