diff mbox series

[v12,26/32] xfsprogs: Set up infastructure for deferred attribute operations

Message ID 20200827002856.1131-27-allison.henderson@oracle.com
State New
Headers show
Series xfsprogs: Delayed Attributes | expand

Commit Message

Allison Collins Aug. 27, 2020, 12:28 a.m. UTC
Source kernel commit: 2527df9851aafc043287d040bced149c9dad63bd

Currently attributes are modified directly across one or more
transactions. But they are not logged or replayed in the event of an
error. The goal of delayed attributes is to enable logging and replaying
of attribute operations using the existing delayed operations
infrastructure.  This will later enable the attributes to become part of
larger multi part operations that also must first be recorded to the
log.  This is mostly of interest in the scheme of parent pointers which
would need to maintain an attribute containing parent inode information
any time an inode is moved, created, or removed.  Parent pointers would
then be of interest to any feature that would need to quickly derive an
inode path from the mount point. Online scrub, nfs lookups and fs grow
or shrink operations are all features that could take advantage of this.

This patch adds two new log item types for setting or removing
attributes as deferred operations.  The xfs_attri_log_item logs an
intent to set or remove an attribute.  The corresponding
xfs_attrd_log_item holds a reference to the xfs_attri_log_item and is
freed once the transaction is done.  Both log items use a generic
xfs_attr_log_format structure that contains the attribute name, value,
flags, inode, and an op_flag that indicates if the operations is a set
or remove.

Signed-off-by: Allison Collins <allison.henderson@oracle.com>
---
 libxfs/defer_item.c     | 171 ++++++++++++++++++++++++++++++++++++++++++++++++
 libxfs/libxfs_priv.h    |   1 +
 libxfs/xfs_attr.c       |   7 +-
 libxfs/xfs_attr.h       |  39 +++++++++++
 libxfs/xfs_defer.c      |   1 +
 libxfs/xfs_defer.h      |   2 +
 libxfs/xfs_log_format.h |  43 +++++++++++-
 libxfs/xfs_types.h      |   1 +
 8 files changed, 259 insertions(+), 6 deletions(-)
diff mbox series

Patch

diff --git a/libxfs/defer_item.c b/libxfs/defer_item.c
index b18182e..ecda7e5 100644
--- a/libxfs/defer_item.c
+++ b/libxfs/defer_item.c
@@ -16,10 +16,14 @@ 
 #include "xfs_trans.h"
 #include "xfs_bmap.h"
 #include "xfs_alloc.h"
+#include "xfs_attr_item.h"
 #include "xfs_rmap.h"
 #include "xfs_refcount.h"
 #include "xfs_bmap.h"
 #include "xfs_inode.h"
+#include "xfs_da_format.h"
+#include "xfs_da_btree.h"
+#include "xfs_attr.h"
 
 /* Dummy defer item ops, since we don't do logging. */
 
@@ -112,6 +116,173 @@  const struct xfs_defer_op_type xfs_extent_free_defer_type = {
 	.cancel_item	= xfs_extent_free_cancel_item,
 };
 
+static inline struct xfs_attrd_log_item *ATTRD_ITEM(struct xfs_log_item *lip)
+{
+	return container_of(lip, struct xfs_attrd_log_item, attrd_item);
+}
+
+/*
+ * Log an ATTRI it to the ATTRD when the attr op is done.  An attr operation
+ * may be a set or a remove.  Note that the transaction is marked dirty
+ * regardless of whether the operation succeeds or fails to support the
+ * ATTRI/ATTRD lifecycle rules.
+ */
+int
+xfs_trans_attr(
+	struct xfs_delattr_context	*dac,
+	struct xfs_attrd_log_item	*attrdp,
+	struct xfs_buf			**leaf_bp,
+	uint32_t			op_flags)
+{
+	struct xfs_da_args		*args = dac->da_args;
+	int				error;
+
+	error = xfs_qm_dqattach_locked(args->dp, 0);
+	if (error)
+		return error;
+
+	switch (op_flags) {
+	case XFS_ATTR_OP_FLAGS_SET:
+		args->op_flags |= XFS_DA_OP_ADDNAME;
+		error = xfs_attr_set_iter(dac, leaf_bp);
+		break;
+	case XFS_ATTR_OP_FLAGS_REMOVE:
+		ASSERT(XFS_IFORK_Q((args->dp)));
+		error = xfs_attr_remove_iter(dac);
+		break;
+	default:
+		error = -EFSCORRUPTED;
+		break;
+	}
+
+	/*
+	 * Mark the transaction dirty, even on error. This ensures the
+	 * transaction is aborted, which:
+	 *
+	 * 1.) releases the ATTRI and frees the ATTRD
+	 * 2.) shuts down the filesystem
+	 */
+	args->trans->t_flags |= XFS_TRANS_DIRTY;
+	set_bit(XFS_LI_DIRTY, &attrdp->attrd_item.li_flags);
+
+	return error;
+}
+
+/* Get an ATTRI. */
+static struct xfs_log_item *
+xfs_attr_create_intent(
+	struct xfs_trans		*tp,
+	struct list_head		*items,
+	unsigned int			count,
+	bool				sort)
+{
+	return NULL;
+}
+
+/* Abort all pending ATTRs. */
+STATIC void
+xfs_attr_abort_intent(
+	struct xfs_log_item		*intent)
+{
+}
+
+/* Get an ATTRD so we can process all the attrs. */
+static struct xfs_log_item *
+xfs_attr_create_done(
+	struct xfs_trans		*tp,
+	struct xfs_log_item		*intent,
+	unsigned int			count)
+{
+	return NULL;
+}
+
+/* Process an attr. */
+STATIC int
+xfs_attr_finish_item(
+	struct xfs_trans		*tp,
+	struct xfs_log_item		*done,
+	struct list_head		*item,
+	struct xfs_btree_cur		**state)
+{
+	struct xfs_attr_item		*attr;
+	int				error;
+	int				local;
+	struct xfs_delattr_context      *dac;
+	struct xfs_da_args              *args;
+	struct xfs_attrd_log_item       *attrdp;
+	struct xfs_attri_log_item       *attrip;
+
+	attr = container_of(item, struct xfs_attr_item, xattri_list);
+	dac = &attr->xattri_dac;
+	args = &attr->xattri_args;
+
+	if (!(dac->flags & XFS_DAC_DELAYED_OP_INIT)) {
+		/* Only need to initialize args context once */
+		memset(args, 0, sizeof(*args));
+		args->geo = attr->xattri_ip->i_mount->m_attr_geo;
+		args->whichfork = XFS_ATTR_FORK;
+		args->dp = attr->xattri_ip;
+		args->name = ((const unsigned char *)attr) +
+				sizeof(struct xfs_attr_item);
+		args->namelen = attr->xattri_name_len;
+		args->attr_filter = attr->xattri_flags;
+		args->hashval = xfs_da_hashname(args->name, args->namelen);
+		args->value = (void *)&args->name[attr->xattri_name_len];
+		args->valuelen = attr->xattri_value_len;
+		args->op_flags = XFS_DA_OP_OKNOENT;
+
+		/* must match existing transaction block res */
+		args->total = xfs_attr_calc_size(args, &local);
+		memset(dac, 0, sizeof(struct xfs_delattr_context));
+		dac->flags |= XFS_DAC_DELAYED_OP_INIT;
+		dac->da_args = args;
+	}
+
+	/*
+	 * Always reset trans after EAGAIN cycle
+	 * since the transaction is new
+	 */
+	args->trans = tp;
+
+	error = xfs_trans_attr(dac, ATTRD_ITEM(done), &dac->leaf_bp,
+			       attr->xattri_op_flags);
+	/*
+	 * The attrip refers to xfs_attr_item memory to log the name and value
+	 * with the intent item. This already occurred when the intent was
+	 * committed so these fields are no longer accessed. Clear them out of
+	 * caution since we're about to free the xfs_attr_item.
+	 */
+	attrdp = (struct xfs_attrd_log_item *)done;
+	attrip = attrdp->attrd_attrip;
+	attrip->attri_name = NULL;
+	attrip->attri_value = NULL;
+
+	if (error != -EAGAIN)
+		kmem_free(attr);
+
+	return error;
+}
+
+/* Cancel an attr */
+STATIC void
+xfs_attr_cancel_item(
+	struct list_head		*item)
+{
+	struct xfs_attr_item		*attr;
+
+	attr = container_of(item, struct xfs_attr_item, xattri_list);
+	kmem_free(attr);
+}
+
+const struct xfs_defer_op_type xfs_attr_defer_type = {
+	.max_items	= 1,
+	.create_intent	= xfs_attr_create_intent,
+	.abort_intent	= xfs_attr_abort_intent,
+	.create_done	= xfs_attr_create_done,
+	.finish_item	= xfs_attr_finish_item,
+	.cancel_item	= xfs_attr_cancel_item,
+};
+
 /*
  * AGFL blocks are accounted differently in the reserve pools and are not
  * inserted into the busy extent list.
diff --git a/libxfs/libxfs_priv.h b/libxfs/libxfs_priv.h
index 5688284..13a1a86 100644
--- a/libxfs/libxfs_priv.h
+++ b/libxfs/libxfs_priv.h
@@ -494,6 +494,7 @@  void __xfs_buf_mark_corrupt(struct xfs_buf *bp, xfs_failaddr_t fa);
 #define xfs_trans_reserve_quota_nblks(t,i,b,n,f)	(0)
 #define xfs_trans_unreserve_quota_nblks(t,i,b,n,f)	((void) 0)
 #define xfs_qm_dqattach(i)				(0)
+#define xfs_qm_dqattach_locked(i,b)			(0)
 
 #define uuid_copy(s,d)		platform_uuid_copy((s),(d))
 #define uuid_equal(s,d)		(platform_uuid_compare((s),(d)) == 0)
diff --git a/libxfs/xfs_attr.c b/libxfs/xfs_attr.c
index c98ae9d..43688ad 100644
--- a/libxfs/xfs_attr.c
+++ b/libxfs/xfs_attr.c
@@ -24,6 +24,7 @@ 
 #include "xfs_quota_defs.h"
 #include "xfs_trans_space.h"
 #include "xfs_trace.h"
+#include "xfs_attr_item.h"
 
 /*
  * xfs_attr.c
@@ -59,8 +60,6 @@  STATIC int xfs_attr_node_hasname(xfs_da_args_t *args,
 STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
 STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
 STATIC int xfs_attr_leaf_try_add(struct xfs_da_args *args, struct xfs_buf *bp);
-STATIC int xfs_attr_set_iter(struct xfs_delattr_context *dac,
-			     struct xfs_buf **leaf_bp);
 
 int
 xfs_inode_hasattr(
@@ -142,7 +141,7 @@  xfs_attr_get(
 /*
  * Calculate how many blocks we need for the new attribute,
  */
-STATIC int
+int
 xfs_attr_calc_size(
 	struct xfs_da_args	*args,
 	int			*local)
@@ -327,7 +326,7 @@  xfs_attr_set_args(
  * to handle this, and recall the function until a successful error code is
  * returned.
  */
-STATIC int
+int
 xfs_attr_set_iter(
 	struct xfs_delattr_context	*dac,
 	struct xfs_buf			**leaf_bp)
diff --git a/libxfs/xfs_attr.h b/libxfs/xfs_attr.h
index 4f6bba8..23b8308 100644
--- a/libxfs/xfs_attr.h
+++ b/libxfs/xfs_attr.h
@@ -247,6 +247,7 @@  enum xfs_delattr_state {
 #define XFS_DAC_DEFER_FINISH		0x01 /* finish the transaction */
 #define XFS_DAC_NODE_RMVNAME_INIT	0x02 /* xfs_attr_node_removename init */
 #define XFS_DAC_LEAF_ADDNAME_INIT	0x04 /* xfs_attr_leaf_addname init*/
+#define XFS_DAC_DELAYED_OP_INIT		0x08 /* delayed operations init*/
 
 /*
  * Context used for keeping track of delayed attribute operations
@@ -254,6 +255,9 @@  enum xfs_delattr_state {
 struct xfs_delattr_context {
 	struct xfs_da_args      *da_args;
 
+	/* Used by delayed attributes to hold leaf across transactions */
+	struct xfs_buf		*leaf_bp;
+
 	/* Used in xfs_attr_rmtval_set_blk to roll through allocating blocks */
 	struct xfs_bmbt_irec	map;
 	xfs_dablk_t		lblkno;
@@ -268,6 +272,38 @@  struct xfs_delattr_context {
 	enum xfs_delattr_state  dela_state;
 };
 
+/*
+ * List of attrs to commit later.
+ */
+struct xfs_attr_item {
+	struct xfs_inode	*xattri_ip;
+	void			*xattri_value;		/* attr value */
+	void			*xattri_name;		/* attr name */
+	uint32_t		xattri_op_flags;	/* attr op set or rm */
+	uint32_t		xattri_value_len;	/* length of value */
+	uint32_t		xattri_name_len;	/* length of name */
+	uint32_t		xattri_flags;		/* attr flags */
+
+	/* used to log this item to an intent */
+	struct list_head	xattri_list;
+
+	/*
+	 * xfs_delattr_context and xfs_da_args need to remain instantiated
+	 * across transaction rolls during the defer finish, so store them here
+	 */
+	struct xfs_da_args		xattri_args;
+	struct xfs_delattr_context	xattri_dac;
+
+	/*
+	 * A byte array follows the header containing the file name and
+	 * attribute value.
+	 */
+};
+
+#define XFS_ATTR_ITEM_SIZEOF(namelen, valuelen)	\
+	(sizeof(struct xfs_attr_item) + (namelen) + (valuelen))
+
+
 /*========================================================================
  * Function prototypes for the kernel.
  *========================================================================*/
@@ -283,11 +319,14 @@  int xfs_attr_get_ilocked(struct xfs_da_args *args);
 int xfs_attr_get(struct xfs_da_args *args);
 int xfs_attr_set(struct xfs_da_args *args);
 int xfs_attr_set_args(struct xfs_da_args *args);
+int xfs_attr_set_iter(struct xfs_delattr_context *dac,
+		      struct xfs_buf **leaf_bp);
 int xfs_has_attr(struct xfs_da_args *args);
 int xfs_attr_remove_args(struct xfs_da_args *args);
 int xfs_attr_remove_iter(struct xfs_delattr_context *dac);
 bool xfs_attr_namecheck(const void *name, size_t length);
 void xfs_delattr_context_init(struct xfs_delattr_context *dac,
 			      struct xfs_da_args *args);
+int xfs_attr_calc_size(struct xfs_da_args *args, int *local);
 
 #endif	/* __XFS_ATTR_H__ */
diff --git a/libxfs/xfs_defer.c b/libxfs/xfs_defer.c
index 34c1019..c6e45e2 100644
--- a/libxfs/xfs_defer.c
+++ b/libxfs/xfs_defer.c
@@ -174,6 +174,7 @@  static const struct xfs_defer_op_type *defer_op_types[] = {
 	[XFS_DEFER_OPS_TYPE_RMAP]	= &xfs_rmap_update_defer_type,
 	[XFS_DEFER_OPS_TYPE_FREE]	= &xfs_extent_free_defer_type,
 	[XFS_DEFER_OPS_TYPE_AGFL_FREE]	= &xfs_agfl_free_defer_type,
+	[XFS_DEFER_OPS_TYPE_ATTR]	= &xfs_attr_defer_type,
 };
 
 static void
diff --git a/libxfs/xfs_defer.h b/libxfs/xfs_defer.h
index 6b2ca58..ed65927 100644
--- a/libxfs/xfs_defer.h
+++ b/libxfs/xfs_defer.h
@@ -18,6 +18,7 @@  enum xfs_defer_ops_type {
 	XFS_DEFER_OPS_TYPE_RMAP,
 	XFS_DEFER_OPS_TYPE_FREE,
 	XFS_DEFER_OPS_TYPE_AGFL_FREE,
+	XFS_DEFER_OPS_TYPE_ATTR,
 	XFS_DEFER_OPS_TYPE_MAX,
 };
 
@@ -62,5 +63,6 @@  extern const struct xfs_defer_op_type xfs_refcount_update_defer_type;
 extern const struct xfs_defer_op_type xfs_rmap_update_defer_type;
 extern const struct xfs_defer_op_type xfs_extent_free_defer_type;
 extern const struct xfs_defer_op_type xfs_agfl_free_defer_type;
+extern const struct xfs_defer_op_type xfs_attr_defer_type;
 
 #endif /* __XFS_DEFER_H__ */
diff --git a/libxfs/xfs_log_format.h b/libxfs/xfs_log_format.h
index e3400c9..6c5bf51 100644
--- a/libxfs/xfs_log_format.h
+++ b/libxfs/xfs_log_format.h
@@ -117,7 +117,11 @@  struct xfs_unmount_log_format {
 #define XLOG_REG_TYPE_CUD_FORMAT	24
 #define XLOG_REG_TYPE_BUI_FORMAT	25
 #define XLOG_REG_TYPE_BUD_FORMAT	26
-#define XLOG_REG_TYPE_MAX		26
+#define XLOG_REG_TYPE_ATTRI_FORMAT	27
+#define XLOG_REG_TYPE_ATTRD_FORMAT	28
+#define XLOG_REG_TYPE_ATTR_NAME		29
+#define XLOG_REG_TYPE_ATTR_VALUE	30
+#define XLOG_REG_TYPE_MAX		30
 
 /*
  * Flags to log operation header
@@ -240,6 +244,8 @@  typedef struct xfs_trans_header {
 #define	XFS_LI_CUD		0x1243
 #define	XFS_LI_BUI		0x1244	/* bmbt update intent */
 #define	XFS_LI_BUD		0x1245
+#define	XFS_LI_ATTRI		0x1246	/* attr set/remove intent*/
+#define XFS_LI_ATTRD		0x1247	/* attr set/remove done */
 
 #define XFS_LI_TYPE_DESC \
 	{ XFS_LI_EFI,		"XFS_LI_EFI" }, \
@@ -255,7 +261,9 @@  typedef struct xfs_trans_header {
 	{ XFS_LI_CUI,		"XFS_LI_CUI" }, \
 	{ XFS_LI_CUD,		"XFS_LI_CUD" }, \
 	{ XFS_LI_BUI,		"XFS_LI_BUI" }, \
-	{ XFS_LI_BUD,		"XFS_LI_BUD" }
+	{ XFS_LI_BUD,		"XFS_LI_BUD" }, \
+	{ XFS_LI_ATTRI,		"XFS_LI_ATTRI" }, \
+	{ XFS_LI_ATTRD,		"XFS_LI_ATTRD" }
 
 /*
  * Inode Log Item Format definitions.
@@ -860,4 +868,35 @@  struct xfs_icreate_log {
 	__be32		icl_gen;	/* inode generation number to use */
 };
 
+/*
+ * Flags for deferred attribute operations.
+ * Upper bits are flags, lower byte is type code
+ */
+#define XFS_ATTR_OP_FLAGS_SET		1	/* Set the attribute */
+#define XFS_ATTR_OP_FLAGS_REMOVE	2	/* Remove the attribute */
+#define XFS_ATTR_OP_FLAGS_TYPE_MASK	0x0FF	/* Flags type mask */
+
+/*
+ * This is the structure used to lay out an attr log item in the
+ * log.
+ */
+struct xfs_attri_log_format {
+	uint16_t	alfi_type;	/* attri log item type */
+	uint16_t	alfi_size;	/* size of this item */
+	uint32_t	__pad;		/* pad to 64 bit aligned */
+	uint64_t	alfi_id;	/* attri identifier */
+	xfs_ino_t	alfi_ino;	/* the inode for this attr operation */
+	uint32_t	alfi_op_flags;	/* marks the op as a set or remove */
+	uint32_t	alfi_name_len;	/* attr name length */
+	uint32_t	alfi_value_len;	/* attr value length */
+	uint32_t	alfi_attr_flags;/* attr flags */
+};
+
+struct xfs_attrd_log_format {
+	uint16_t	alfd_type;	/* attrd log item type */
+	uint16_t	alfd_size;	/* size of this item */
+	uint32_t	__pad;		/* pad to 64 bit aligned */
+	uint64_t	alfd_alf_id;	/* id of corresponding attrd */
+};
+
 #endif /* __XFS_LOG_FORMAT_H__ */
diff --git a/libxfs/xfs_types.h b/libxfs/xfs_types.h
index 397d947..860cdd2 100644
--- a/libxfs/xfs_types.h
+++ b/libxfs/xfs_types.h
@@ -11,6 +11,7 @@  typedef uint32_t	prid_t;		/* project ID */
 typedef uint32_t	xfs_agblock_t;	/* blockno in alloc. group */
 typedef uint32_t	xfs_agino_t;	/* inode # within allocation grp */
 typedef uint32_t	xfs_extlen_t;	/* extent length in blocks */
+typedef uint32_t	xfs_attrlen_t;	/* attr length */
 typedef uint32_t	xfs_agnumber_t;	/* allocation group number */
 typedef int32_t		xfs_extnum_t;	/* # of extents in a file */
 typedef int16_t		xfs_aextnum_t;	/* # extents in an attribute fork */