[PATCH 14/47] xfs: enable the xfs_defer mechanism to process extents to free

Darrick J. Wong
2016-07-21T04:57:46Z

Connect the xfs_defer mechanism with the pieces that we'll need to
handle deferred extent freeing. We'll wire up the existing code to
our new deferred mechanism later.

v2: Move the deferred item code into xfs_trans_extfree.c. (kernel)

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
fs/xfs/libxfs/xfs_defer.h | 1
fs/xfs/xfs_super.c | 2 +
fs/xfs/xfs_trans.h | 2 +
fs/xfs/xfs_trans_extfree.c | 110 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 115 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h
index a227bd2..b9b5a92 100644
--- a/fs/xfs/libxfs/xfs_defer.h
+++ b/fs/xfs/libxfs/xfs_defer.h
@@ -51,6 +51,7 @@ struct xfs_defer_pending {
* find all the space it needs.
*/
enum xfs_defer_ops_type {
+ XFS_DEFER_OPS_TYPE_FREE,
XFS_DEFER_OPS_TYPE_MAX,
};

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 258b594..ce50474 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1858,6 +1858,8 @@ init_xfs_fs(void)
printk(KERN_INFO XFS_VERSION_STRING " with "
XFS_BUILD_OPTIONS " enabled\n");

+ xfs_extent_free_init_defer_op();
+
xfs_dir_startup();

error = xfs_init_zones();
diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h
index 5226511..005fbec 100644
--- a/fs/xfs/xfs_trans.h
+++ b/fs/xfs/xfs_trans.h
@@ -209,6 +209,8 @@ void xfs_trans_ichgtime(struct xfs_trans *, struct xfs_inode *, int);
void xfs_trans_ijoin(struct xfs_trans *, struct xfs_inode *, uint);
void xfs_trans_log_buf(xfs_trans_t *, struct xfs_buf *, uint, uint);
void xfs_trans_log_inode(xfs_trans_t *, struct xfs_inode *, uint);
+
+void xfs_extent_free_init_defer_op(void);
struct xfs_efi_log_item *xfs_trans_get_efi(struct xfs_trans *, uint);
void xfs_trans_log_efi_extent(struct xfs_trans *,
struct xfs_efi_log_item *,
diff --git a/fs/xfs/xfs_trans_extfree.c b/fs/xfs/xfs_trans_extfree.c
index 380cc46..a9f34ee 100644
--- a/fs/xfs/xfs_trans_extfree.c
+++ b/fs/xfs/xfs_trans_extfree.c
@@ -22,10 +22,12 @@
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
+#include "xfs_defer.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_extfree_item.h"
#include "xfs_alloc.h"
+#include "xfs_bmap.h"

/*
* This routine is called to allocate an "extent free intention"
@@ -145,3 +147,111 @@ xfs_trans_free_extent(

return error;
}
+
+/* Sort bmap items by AG. */
+static int
+xfs_extent_free_diff_items(
+ void *priv,
+ struct list_head *a,
+ struct list_head *b)
+{
+ struct xfs_mount *mp = priv;
+ struct xfs_bmap_free_item *ra;
+ struct xfs_bmap_free_item *rb;
+
+ ra = container_of(a, struct xfs_bmap_free_item, xbfi_list);
+ rb = container_of(b, struct xfs_bmap_free_item, xbfi_list);
+ return XFS_FSB_TO_AGNO(mp, ra->xbfi_startblock) -
+ XFS_FSB_TO_AGNO(mp, rb->xbfi_startblock);
+}
+
+/* Get an EFI. */
+STATIC void *
+xfs_extent_free_create_intent(
+ struct xfs_trans *tp,
+ unsigned int count)
+{
+ return xfs_trans_get_efi(tp, count);
+}
+
+/* Log a free extent to the intent item. */
+STATIC void
+xfs_extent_free_log_item(
+ struct xfs_trans *tp,
+ void *intent,
+ struct list_head *item)
+{
+ struct xfs_bmap_free_item *free;
+
+ free = container_of(item, struct xfs_bmap_free_item, xbfi_list);
+ xfs_trans_log_efi_extent(tp, intent, free->xbfi_startblock,
+ free->xbfi_blockcount);
+}
+
+/* Get an EFD so we can process all the free extents. */
+STATIC void *
+xfs_extent_free_create_done(
+ struct xfs_trans *tp,
+ void *intent,
+ unsigned int count)
+{
+ return xfs_trans_get_efd(tp, intent, count);
+}
+
+/* Process a free extent. */
+STATIC int
+xfs_extent_free_finish_item(
+ struct xfs_trans *tp,
+ struct xfs_defer_ops *dop,
+ struct list_head *item,
+ void *done_item,
+ void **state)
+{
+ struct xfs_bmap_free_item *free;
+ int error;
+
+ free = container_of(item, struct xfs_bmap_free_item, xbfi_list);
+ error = xfs_trans_free_extent(tp, done_item,
+ free->xbfi_startblock,
+ free->xbfi_blockcount);
+ kmem_free(free);
+ return error;
+}
+
+/* Abort all pending EFIs. */
+STATIC void
+xfs_extent_free_abort_intent(
+ void *intent)
+{
+ xfs_efi_release(intent);
+}
+
+/* Cancel a free extent. */
+STATIC void
+xfs_extent_free_cancel_item(
+ struct list_head *item)
+{
+ struct xfs_bmap_free_item *free;
+
+ free = container_of(item, struct xfs_bmap_free_item, xbfi_list);
+ kmem_free(free);
+}
+
+static const struct xfs_defer_op_type xfs_extent_free_defer_type = {
+ .type = XFS_DEFER_OPS_TYPE_FREE,
+ .max_items = XFS_EFI_MAX_FAST_EXTENTS,
+ .diff_items = xfs_extent_free_diff_items,
+ .create_intent = xfs_extent_free_create_intent,
+ .abort_intent = xfs_extent_free_abort_intent,
+ .log_item = xfs_extent_free_log_item,
+ .create_done = xfs_extent_free_create_done,
+ .finish_item = xfs_extent_free_finish_item,
+ .cancel_item = xfs_extent_free_cancel_item,
+};
+
+/* Register the deferred op type. */
+void
+xfs_extent_free_init_defer_op(void)
+{
+ xfs_defer_init_op_type(&xfs_extent_free_defer_type);
+}