From: Dave Chinner <dchinner@xxxxxxxxxx>
Add parent pointer attribute during xfs_create, and
subroutines to initialize attributes
[bfoster: rebase, use VFS inode generation]
[achender: rebased, changed __unint32_t to xfs_dir2_dataptr_t,
fixed some null pointer bugs,
merged error handling patch,
added subroutines to handle attribute initialization]
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Signed-off-by: Allison Henderson <allison.henderson@xxxxxxxxxx>
---
v2: remove unnecessary ENOSPC handling in xfs_attr_set_first_parent
Signed-off-by: Allison Henderson <allison.henderson@xxxxxxxxxx>
---
fs/xfs/Makefile | 1 +
fs/xfs/libxfs/xfs_parent.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++
fs/xfs/xfs_attr.h | 15 +++++++-
fs/xfs/xfs_inode.c | 16 +++++++-
4 files changed, 123 insertions(+), 2 deletions(-)
diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index ec6486b..3015bca 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -52,6 +52,7 @@ xfs-y += $(addprefix libxfs/, \
xfs_inode_fork.o \
xfs_inode_buf.o \
xfs_log_rlimit.o \
+ xfs_parent.o \
xfs_ag_resv.o \
xfs_rmap.o \
xfs_rmap_btree.o \
diff --git a/fs/xfs/libxfs/xfs_parent.c b/fs/xfs/libxfs/xfs_parent.c
new file mode 100644
index 0000000..5eec0ab
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_parent.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2015 Red Hat, Inc.
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_shared.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_inode.h"
+#include "xfs_error.h"
+#include "xfs_trace.h"
+#include "xfs_trans.h"
+#include "xfs_attr.h"
+
+/*
+ * Parent pointer attribute handling.
+ *
+ * Because the attribute value is a filename component, it will never be longer
+ * than 255 bytes. This means the attribute will always be a local format
+ * attribute as it is xfs_attr_leaf_entsize_local_max() for v5 filesystems will
+ * always be larger than this (max is 75% of block size).
+ *
+ * Creating a new parent attribute will always create a new attribute - there
+ * should never, ever be an existing attribute in the tree for a new inode.
+ * ENOSPC behaviour is problematic - creating the inode without the parent
+ * pointer is effectively a corruption, so we allow parent attribute creation
+ * to dip into the reserve block pool to avoid unexpected ENOSPC errors from
+ * occurring.
+ */
+
+
+/* Initializes a xfs_parent_name_rec to be stored as an attribute name */
+void
+xfs_init_parent_name_rec(
+ struct xfs_parent_name_rec *rec,
+ unsigned long long int p_ino,
+ unsigned int p_gen,
+ unsigned int p_diroffset)
+{
+ rec->p_ino = cpu_to_be64(p_ino);
+ rec->p_gen = cpu_to_be32(p_gen);
+ rec->p_diroffset = cpu_to_be32(p_diroffset);
+}
+
+/* Initializes a xfs_parent_name_irec from an xfs_parent_name_rec */
+void
+xfs_init_parent_name_irec(
+ struct xfs_parent_name_irec *irec,
+ struct xfs_parent_name_rec *rec)
+{
+ irec->p_ino = be64_to_cpu(rec->p_ino);
+ irec->p_gen = be32_to_cpu(rec->p_gen);
+ irec->p_diroffset = be32_to_cpu(rec->p_diroffset);
+}
+
+/*
+ * Add a parent record to an inode with existing parent records.
+ */
+int
+xfs_parent_add(
+ struct xfs_trans *tp,
+ struct xfs_inode *parent,
+ struct xfs_inode *child,
+ struct xfs_name *child_name,
+ uint32_t diroffset,
+ struct xfs_defer_ops *dfops,
+ xfs_fsblock_t *firstblock)
+{
+ struct xfs_parent_name_rec rec;
+
+ xfs_init_parent_name_rec(&rec, parent->i_ino,
+ VFS_I(parent)->i_generation, diroffset);
+
+ return xfs_attr_set_deferred(child, dfops, &rec, sizeof(rec),
+ (void *)child_name->name, child_name->len, ATTR_PARENT);
+}
+
diff --git a/fs/xfs/xfs_attr.h b/fs/xfs/xfs_attr.h
index 1f5c711..09ef747 100644
--- a/fs/xfs/xfs_attr.h
+++ b/fs/xfs/xfs_attr.h
@@ -19,6 +19,8 @@
#define __XFS_ATTR_H__
#include "libxfs/xfs_defer.h"
+#include "libxfs/xfs_da_format.h"
+#include "libxfs/xfs_format.h"
struct xfs_inode;
struct xfs_da_args;
@@ -184,5 +186,16 @@ int xfs_attr_set_deferred(struct xfs_inode *dp, struct xfs_defer_ops *dfops,
unsigned int valuelen, int flags);
int xfs_attr_remove_deferred(struct xfs_inode *dp, struct xfs_defer_ops *dfops,
void *name, unsigned int namelen, int flags);
-
+/*
+ * Parent pointer attribute prototypes
+ */
+void xfs_init_parent_name_rec(struct xfs_parent_name_rec *rec,
+ unsigned long long int p_ino, unsigned int p_gen,
+ unsigned int p_diroffset);
+void xfs_init_parent_name_irec(struct xfs_parent_name_irec *irec,
+ struct xfs_parent_name_rec *rec);
+int xfs_parent_add(struct xfs_trans *tp, struct xfs_inode *parent,
+ struct xfs_inode *child, struct xfs_name *child_name,
+ xfs_dir2_dataptr_t diroffset, struct xfs_defer_ops *dfops,
+ xfs_fsblock_t *firstblock);
#endif /* __XFS_ATTR_H__ */
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index f7986d8..1c45c73 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1164,6 +1164,7 @@ xfs_create(
struct xfs_dquot *pdqp = NULL;
struct xfs_trans_res *tres;
uint resblks;
+ xfs_dir2_dataptr_t diroffset;
trace_xfs_create(dp, name);
@@ -1253,7 +1254,7 @@ xfs_create(
error = xfs_dir_createname(tp, dp, name, ip->i_ino,
&first_block, &dfops, resblks ?
resblks - XFS_IALLOC_SPACE_RES(mp) : 0,
- NULL);
+ &diroffset);
if (error) {
ASSERT(error != -ENOSPC);
goto out_trans_cancel;
@@ -1272,6 +1273,19 @@ xfs_create(
}
/*
+ * If we have parent pointers, we need to add the attribute containing
+ * the parent information now. This must be done within the same
+ * transaction the directory entry is created, while the new inode
+ * contains nothing in the inode literal area.
+ */
+ if (xfs_sb_version_hasparent(&mp->m_sb)) {
+ error = xfs_parent_add(tp, dp, ip, name, diroffset,
+ &dfops, &first_block);
+ if (error)
+ goto out_bmap_cancel;
+ }
+
+ /*
* If this is a synchronous mount, make sure that the
* create transaction goes to disk before returning to
* the user.
--
2.7.4
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